[RFC PATCH 00/14] coresight: Support for ETMv4.4 system instructions

[RFC PATCH 00/14] coresight: Support for ETMv4.4 system instructions

[Suzuki K Poulose]

CoreSight ETMv4.4 introduced system instructions for accessing
the ETM. This also implies that they may not be on the amba bus.
Right now all the CoreSight components are accessed via memory
map. Also, we have some common routines in coresight generic
code driver (e.g, CS_LOCK, claim/disclaim), which assume the
mmio. In order to preserve the generic algorithms at a single
place and to allow dynamic switch for ETMs, this series introduces
an abstraction layer for accessing a coresight device. It is
designed such that the mmio access are fast tracked (i.e, without
an indirect function call).

This will also help us to get rid of the driver+attribute specific
sysfs show/store routines and replace them with a single routine
to access a given register offset (which can be embedded in the
dev_ext_attribute). This is not currently implemented in the series,
but can be achieved.

Further we switch the generic routines to work with the abstraction.
With this in place, we refactor the etm4x code a bit to allow for
supporting the system instructions with very little new code. The
changes also switch to using the system instructions by default
even when we may have an MMIO.

The series has been mildly tested on a model. I would really 
appreciate any testing on real hardware.

Applies on coresight/next tree. The tree is also available here :

 git://linux-arm.org/linux-skp.git etm-4.4/rfc

Suzuki K Poulose (14):
  coresight: etm4x: Skip save/restore before device registration
  coresight: Introduce device access abstraction
  coresight: tpiu: Use coresight device access abstraction
  coresight: etm4x: Free up argument of etm4_init_arch_data
  coresight: Convert coresight_timeout to use access abstraction
  coresight: Convert claim and lock operations to use access wrappers
  coresight: etm4x: Always read the registers on the host CPU
  coresight: etm4x: Convert all register accesses
  coresight: etm4x: Add sysreg access helpers
  coresight: etm4x: Define DEVARCH register fields
  coresight: etm4x: Detect system register access support
  coresight: etm4x: Refactor probing routine
  coresight: etm4x: Add support for sysreg only devices
  dts: bindings: coresight: ETMv4.4 system register access only units

 .../devicetree/bindings/arm/coresight.txt     |   6 +-
 drivers/hwtracing/coresight/coresight-catu.c  |  17 +-
 .../hwtracing/coresight/coresight-cpu-debug.c |  26 +-
 .../hwtracing/coresight/coresight-cti-sysfs.c |   4 +-
 drivers/hwtracing/coresight/coresight-cti.c   |  31 +-
 drivers/hwtracing/coresight/coresight-etb10.c |  26 +-
 .../coresight/coresight-etm3x-sysfs.c         |   8 +-
 drivers/hwtracing/coresight/coresight-etm3x.c |  45 +-
 .../coresight/coresight-etm4x-sysfs.c         |  32 +-
 drivers/hwtracing/coresight/coresight-etm4x.c | 580 +++++++++++-------
 drivers/hwtracing/coresight/coresight-etm4x.h | 403 +++++++++++-
 .../hwtracing/coresight/coresight-funnel.c    |  19 +-
 drivers/hwtracing/coresight/coresight-priv.h  |   9 +-
 .../coresight/coresight-replicator.c          |  28 +-
 drivers/hwtracing/coresight/coresight-stm.c   |  49 +-
 .../hwtracing/coresight/coresight-tmc-etf.c   |  36 +-
 .../hwtracing/coresight/coresight-tmc-etr.c   |  19 +-
 drivers/hwtracing/coresight/coresight-tmc.c   |  10 +-
 drivers/hwtracing/coresight/coresight-tpiu.c  |  32 +-
 drivers/hwtracing/coresight/coresight.c       | 130 +++-
 include/linux/coresight.h                     | 189 +++++-
 21 files changed, 1273 insertions(+), 426 deletions(-)

-- 
2.24.1


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[RFC PATCH 01/14] coresight: etm4x: Skip save/restore before device registration

[Suzuki K Poulose]

Skip cpu save/restore before the coresight device is registered.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 6d7d2169bfb2..cb83fb77ded6 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1135,7 +1135,13 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 {
 	int i, ret = 0;
 	struct etmv4_save_state *state;
-	struct device *etm_dev = &drvdata->csdev->dev;
+	struct coresight_device *csdev = drvdata->csdev;
+	struct device *etm_dev;
+
+	if (WARN_ON(!csdev))
+		return -ENODEV;
+
+	etm_dev = &csdev->dev;
 
 	/*
 	 * As recommended by 3.4.1 ("The procedure when powering down the PE")
@@ -1261,6 +1267,10 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
 {
 	int i;
 	struct etmv4_save_state *state = drvdata->save_state;
+	struct coresight_device *csdev = drvdata->csdev;
+
+	if (WARN_ON(!csdev))
+		return;
 
 	CS_UNLOCK(drvdata->base);
 
@@ -1368,6 +1378,10 @@ static int etm4_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
 
 	drvdata = etmdrvdata[cpu];
 
+	/* If we have not registered the device there is nothing to do */
+	if (!drvdata->csdev)
+		return NOTIFY_OK;
+
 	if (!drvdata->save_state)
 		return NOTIFY_OK;
 
-- 
2.24.1


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Re: [RFC PATCH 01/14] coresight: etm4x: Skip save/restore before device registration

[Mathieu Poirier]

Hi Suzuki,

I have starte to review this - comments will be scattered over a few days.

On Wed, Jul 22, 2020 at 06:20:27PM +0100, Suzuki K Poulose wrote:
> Skip cpu save/restore before the coresight device is registered.
> 
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-etm4x.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index 6d7d2169bfb2..cb83fb77ded6 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -1135,7 +1135,13 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  {
>  	int i, ret = 0;
>  	struct etmv4_save_state *state;
> -	struct device *etm_dev = &drvdata->csdev->dev;
> +	struct coresight_device *csdev = drvdata->csdev;
> +	struct device *etm_dev;
> +
> +	if (WARN_ON(!csdev))
> +		return -ENODEV;
> +
> +	etm_dev = &csdev->dev;
>  
>  	/*
>  	 * As recommended by 3.4.1 ("The procedure when powering down the PE")
> @@ -1261,6 +1267,10 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
>  {
>  	int i;
>  	struct etmv4_save_state *state = drvdata->save_state;
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	if (WARN_ON(!csdev))
> +		return;

Restore and save operations are only called from etm4_cpu_pm_notify() where the
check for a valid drvdata->csdev is already done.

>  
>  	CS_UNLOCK(drvdata->base);
>  
> @@ -1368,6 +1378,10 @@ static int etm4_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
>  
>  	drvdata = etmdrvdata[cpu];
>  
> +	/* If we have not registered the device there is nothing to do */
> +	if (!drvdata->csdev)
> +		return NOTIFY_OK;

Can you describe the scenario you've seen this happening in?  Probably best to
add it to the changelog. 

> +
>  	if (!drvdata->save_state)
>  		return NOTIFY_OK;
>  
> -- 
> 2.24.1
> 

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Re: [RFC PATCH 01/14] coresight: etm4x: Skip save/restore before device registration

[Suzuki K Poulose]

On 07/29/2020 07:01 PM, Mathieu Poirier wrote:
> Hi Suzuki,
> 
> I have starte to review this - comments will be scattered over a few days.
> 
> On Wed, Jul 22, 2020 at 06:20:27PM +0100, Suzuki K Poulose wrote:
>> Skip cpu save/restore before the coresight device is registered.
>>
>> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
>> Cc: Mike Leach <mike.leach@linaro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-etm4x.c | 16 +++++++++++++++-
>>   1 file changed, 15 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
>> index 6d7d2169bfb2..cb83fb77ded6 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
>> @@ -1135,7 +1135,13 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>>   {
>>   	int i, ret = 0;
>>   	struct etmv4_save_state *state;
>> -	struct device *etm_dev = &drvdata->csdev->dev;
>> +	struct coresight_device *csdev = drvdata->csdev;
>> +	struct device *etm_dev;
>> +
>> +	if (WARN_ON(!csdev))
>> +		return -ENODEV;
>> +
>> +	etm_dev = &csdev->dev;
>>   
>>   	/*
>>   	 * As recommended by 3.4.1 ("The procedure when powering down the PE")
>> @@ -1261,6 +1267,10 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
>>   {
>>   	int i;
>>   	struct etmv4_save_state *state = drvdata->save_state;
>> +	struct coresight_device *csdev = drvdata->csdev;
>> +
>> +	if (WARN_ON(!csdev))
>> +		return;
> 
> Restore and save operations are only called from etm4_cpu_pm_notify() where the
> check for a valid drvdata->csdev is already done.
> 

Correct, this is just an enforcement as we are going to rely on the 
availability of drvdata->csdev to access the device with the
introduction of abstraction. This is why we WARN_ON() as we should
never hit this case.

>>   
>>   	CS_UNLOCK(drvdata->base);
>>   
>> @@ -1368,6 +1378,10 @@ static int etm4_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
>>   
>>   	drvdata = etmdrvdata[cpu];
>>   
>> +	/* If we have not registered the device there is nothing to do */
>> +	if (!drvdata->csdev)
>> +		return NOTIFY_OK;
> 
> Can you describe the scenario you've seen this happening in?  Probably best to
> add it to the changelog.

The CPU PM notifier is registered with the probing of the first ETM
device. Now, another ETM device could be probed (on a different CPU
than the parent of this ETM). Now, there is a very narrow window of
time between :

1) Initialise etmdrvdata[cpu]

2) Register the coresight_device for the ETM.(i.e, coresight_register()).

If the CPU is put on idle, after (1) and before (2), we end up with

drvdata->csdev == NULL.

This is unacceptable and there is no need to take an action in
such case. This patch fixes the potential problem, also making
sure that we have the access methods available when we need it.
(drvdata->csdev->access)

I will add it to the commit message.

Cheers
Suzuki

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[RFC PATCH 02/14] coresight: Introduce device access abstraction

[Suzuki K Poulose]

We are about to introduce support for sysreg access to ETMv4.4+
component. Since there are generic routines that access the
registers (e.g, CS_LOCK/UNLOCK , claim/disclaim operations, timeout)
and in order to preserve the logic of these operations at a single place
we introduce an abstraction layer for the accesses to a given device.
This will also be helpful in consolidating the sysfs.attribute helpers,
that we define per driver.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-catu.c  |   1 +
 drivers/hwtracing/coresight/coresight-cti.c   |   1 +
 drivers/hwtracing/coresight/coresight-etb10.c |   1 +
 drivers/hwtracing/coresight/coresight-etm3x.c |   1 +
 drivers/hwtracing/coresight/coresight-etm4x.c |   1 +
 .../hwtracing/coresight/coresight-funnel.c    |   1 +
 .../coresight/coresight-replicator.c          |   1 +
 drivers/hwtracing/coresight/coresight-stm.c   |   1 +
 drivers/hwtracing/coresight/coresight-tmc.c   |   1 +
 drivers/hwtracing/coresight/coresight-tpiu.c  |   1 +
 drivers/hwtracing/coresight/coresight.c       |  49 ++++++
 include/linux/coresight.h                     | 156 ++++++++++++++++++
 12 files changed, 215 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 1801804a7762..6299ff7b8a14 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -551,6 +551,7 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
 	dev->platform_data = pdata;
 
 	drvdata->base = base;
+	catu_desc.access.base = base;
 	catu_desc.pdata = pdata;
 	catu_desc.dev = dev;
 	catu_desc.groups = catu_groups;
diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c
index 3ccc703dc940..c810ea3ba155 100644
--- a/drivers/hwtracing/coresight/coresight-cti.c
+++ b/drivers/hwtracing/coresight/coresight-cti.c
@@ -865,6 +865,7 @@ static int cti_probe(struct amba_device *adev, const struct amba_id *id)
 		return PTR_ERR(base);
 
 	drvdata->base = base;
+	cti_desc.access.base = base;
 
 	dev_set_drvdata(dev, drvdata);
 
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 03e3f2590191..0f2735e15119 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -755,6 +755,7 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 		return PTR_ERR(base);
 
 	drvdata->base = base;
+	desc.access.base = base;
 
 	spin_lock_init(&drvdata->spinlock);
 
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index bf22dcfd3327..7ddcb7fcb2d6 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -805,6 +805,7 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 		return PTR_ERR(base);
 
 	drvdata->base = base;
+	desc.access.base = base;
 
 	spin_lock_init(&drvdata->spinlock);
 
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index cb83fb77ded6..7bb74c659c4f 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1501,6 +1501,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 		return PTR_ERR(base);
 
 	drvdata->base = base;
+	desc.access.base = base;
 
 	spin_lock_init(&drvdata->spinlock);
 
diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index 900690a9f7f0..67fc3e3b77d8 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -242,6 +242,7 @@ static int funnel_probe(struct device *dev, struct resource *res)
 		}
 		drvdata->base = base;
 		desc.groups = coresight_funnel_groups;
+		desc.access.base = base;
 	}
 
 	dev_set_drvdata(dev, drvdata);
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index 78acf29c49ca..65704ada20a5 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -254,6 +254,7 @@ static int replicator_probe(struct device *dev, struct resource *res)
 		}
 		drvdata->base = base;
 		desc.groups = replicator_groups;
+		desc.access.base = base;
 	}
 
 	if (fwnode_property_present(dev_fwnode(dev),
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 673d2f56ed1e..c8509cc78512 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -881,6 +881,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 	drvdata->base = base;
+	desc.access.base = base;
 
 	ret = stm_get_stimulus_area(dev, &ch_res);
 	if (ret)
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 7040d583bed9..b49795ad6861 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -458,6 +458,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 	}
 
 	drvdata->base = base;
+	desc.access.base = base;
 
 	spin_lock_init(&drvdata->spinlock);
 
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index f8583e4032a6..7ef7649f48ad 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -149,6 +149,7 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 		return PTR_ERR(base);
 
 	drvdata->base = base;
+	desc.access.base = base;
 
 	/* Disable tpiu to support older devices */
 	tpiu_disable_hw(drvdata);
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index e9c90f2de34a..38e9c03ab754 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1387,6 +1387,54 @@ static int __init coresight_init(void)
 }
 postcore_initcall(coresight_init);
 
+u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset)
+{
+	return csdev_access_relaxed_read32(&csdev->access, offset);
+}
+
+u32 coresight_read32(struct coresight_device *csdev, u32 offset)
+{
+	return csdev_access_read32(&csdev->access, offset);
+}
+
+void coresight_relaxed_write32(struct coresight_device *csdev,
+			       u32 val,
+			       u32 offset)
+{
+
+	csdev_access_relaxed_write32(&csdev->access, val, offset);
+}
+
+
+void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset)
+{
+	csdev_access_write32(&csdev->access, val, offset);
+}
+
+u64 coresight_relaxed_read64(struct coresight_device *csdev, u32 offset)
+{
+	return csdev_access_relaxed_read64(&csdev->access, offset);
+}
+
+u64 coresight_read64(struct coresight_device *csdev, u32 offset)
+{
+	return csdev_access_read64(&csdev->access, offset);
+}
+
+void coresight_relaxed_write64(struct coresight_device *csdev,
+			       u64 val,
+			       u32 offset)
+{
+
+	csdev_access_relaxed_write64(&csdev->access, val, offset);
+}
+
+
+void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
+{
+	csdev_access_write64(&csdev->access, val, offset);
+}
+
 /*
  * coresight_release_platform_data: Release references to the devices connected
  * to the output port of this device.
@@ -1451,6 +1499,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 	csdev->type = desc->type;
 	csdev->subtype = desc->subtype;
 	csdev->ops = desc->ops;
+	csdev->access = desc->access;
 	csdev->orphan = false;
 
 	csdev->dev.type = &coresight_dev_type[desc->type];
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 58fffdecdbfd..81ac708689f8 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -7,6 +7,7 @@
 #define _LINUX_CORESIGHT_H
 
 #include <linux/device.h>
+#include <linux/io.h>
 #include <linux/perf_event.h>
 #include <linux/sched.h>
 
@@ -114,6 +115,32 @@ struct coresight_platform_data {
 	struct coresight_connection *conns;
 };
 
+/**
+ * struct csdev_access - Abstraction of a CoreSight device access.
+ *
+ * @no_iomem	: True if the device doesn't have iomem access.
+ * @base	: When no_iomem == false, base address of the component
+ * @read	: Read from the given "offset" of the given instance.
+ * @write	: Write "val" to the given "offset".
+ */
+struct csdev_access {
+	bool no_iomem;
+	union {
+		void __iomem *base;
+		struct {
+			u64 (*read)(struct csdev_access *csa,
+				    u32 offset,
+				    bool relaxed,
+				    bool _64bit);
+			void (*write)(struct csdev_access *csa,
+				      u64 val,
+				      u32 offset,
+				      bool relaxed,
+				      bool _64bit);
+		};
+	};
+};
+
 /**
  * struct coresight_desc - description of a component required from drivers
  * @type:	as defined by @coresight_dev_type.
@@ -134,6 +161,7 @@ struct coresight_desc {
 	struct device *dev;
 	const struct attribute_group **groups;
 	const char *name;
+	struct csdev_access access;
 };
 
 /**
@@ -186,6 +214,7 @@ struct coresight_sysfs_link {
  * @def_sink:	cached reference to default sink found for this device.
  * @ect_dev:	Associated cross trigger device. Not part of the trace data
  *		path or connections.
+ * @csa:	Device i/o access abstraction for this device.
  * @nr_links:   number of sysfs links created to other components from this
  *		device. These will appear in the "connections" group.
  * @has_conns_grp: Have added a "connections" group for sysfs links.
@@ -205,6 +234,7 @@ struct coresight_device {
 	struct coresight_device *def_sink;
 	/* cross trigger handling */
 	struct coresight_device *ect_dev;
+	struct csdev_access access;
 	/* sysfs links between components */
 	int nr_links;
 	bool has_conns_grp;
@@ -324,6 +354,79 @@ struct coresight_ops {
 	const struct coresight_ops_ect *ect_ops;
 };
 
+static inline u32 csdev_access_relaxed_read32(struct csdev_access *csa,
+					      u32 offset)
+{
+	if (likely(!csa->no_iomem))
+		return readl_relaxed(csa->base + offset);
+	return csa->read(csa, offset, true, false);
+}
+
+static inline u64 csdev_access_relaxed_read64(struct csdev_access *csa,
+					   u32 offset)
+{
+	if (likely(!csa->no_iomem))
+		return readq_relaxed(csa->base + offset);
+	return csa->read(csa, offset, true, true);
+}
+
+static inline u32 csdev_access_read32(struct csdev_access *csa, u32 offset)
+{
+	if (likely(!csa->no_iomem))
+		return readl(csa->base + offset);
+	return csa->read(csa, offset, false, false);
+}
+
+static inline u64 csdev_access_read64(struct csdev_access *csa, u32 offset)
+{
+	if (likely(!csa->no_iomem))
+		return readq(csa->base + offset);
+	return csa->read(csa, offset, false, true);
+}
+
+static inline void csdev_access_relaxed_write32(struct csdev_access *csa,
+						u32 val,
+						u32 offset)
+{
+	if (likely(!csa->no_iomem))
+		return writel_relaxed(val, csa->base + offset);
+
+	return csa->write(csa, val, offset, true, false);
+}
+
+static inline void csdev_access_relaxed_write64(struct csdev_access *csa,
+					     u64 val,
+					     u32 offset)
+{
+	if (likely(!csa->no_iomem))
+		return writeq_relaxed(val, csa->base + offset);
+
+	return csa->write(csa, val, offset, true, true);
+}
+
+static inline void csdev_access_write32(struct csdev_access *csa, u32 val, u32 offset)
+{
+	if (likely(!csa->no_iomem))
+		return writel(val, csa->base + offset);
+
+	return csa->write(csa, val, offset, false, false);
+}
+
+static inline void csdev_access_write64(struct csdev_access *csa, u64 val, u32 offset)
+{
+	if (likely(!csa->no_iomem))
+		return writeq(val, csa->base + offset);
+
+	return csa->write(csa, val, offset, false, true);
+}
+
+
+u64 coresight_relaxed_read64(struct coresight_device *csdev, u32 offset);
+u64 coresight_read64(struct coresight_device *csdev, u32 offset);
+void coresight_relaxed_write64(struct coresight_device *csdev,
+			       u64 val, u32 offset);
+void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset);
+
 #ifdef CONFIG_CORESIGHT
 extern struct coresight_device *
 coresight_register(struct coresight_desc *desc);
@@ -342,6 +445,14 @@ extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
 					 struct device *dev);
 
 extern bool coresight_loses_context_with_cpu(struct device *dev);
+
+u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset);
+u32 coresight_read32(struct coresight_device *csdev, u32 offset);
+void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset);
+void coresight_relaxed_write32(struct coresight_device *csdev,
+			       u32 val,
+			       u32 offset);
+
 #else
 static inline struct coresight_device *
 coresight_register(struct coresight_desc *desc) { return NULL; }
@@ -368,6 +479,51 @@ static inline bool coresight_loses_context_with_cpu(struct device *dev)
 {
 	return false;
 }
+
+static inline u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset)
+{
+	WARN_ON_ONCE(1);
+	return 0;
+}
+
+static inline u32 coresight_read32(struct coresight_device *csdev, u32 offset)
+{
+	WARN_ON_ONCE(1);
+	return 0;
+}
+
+static void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset)
+{
+}
+
+static void coresight_relaxed_write32(struct coresight_device *csdev,
+				      u32 val, u32 offset);
+{
+}
+
+static inline u64 coresight_relaxed_read64(struct coresight_device *csdev,
+					   u32 offset)
+{
+	WARN_ON_ONCE(1);
+	return 0;
+}
+
+static inline u64 coresight_read64(struct coresight_device *csdev, u32 offset)
+{
+	WARN_ON_ONCE(1);
+	return 0;
+}
+
+static inline void coresight_relaxed_write64(struct coresight_device *csdev,
+					     u64 val,
+					     u32 offset)
+{
+}
+
+static inline void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
+{
+}
+
 #endif
 
 extern int coresight_get_cpu(struct device *dev);
-- 
2.24.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [RFC PATCH 02/14] coresight: Introduce device access abstraction

[Mathieu Poirier]

On Wed, Jul 22, 2020 at 06:20:28PM +0100, Suzuki K Poulose wrote:
> We are about to introduce support for sysreg access to ETMv4.4+
> component. Since there are generic routines that access the
> registers (e.g, CS_LOCK/UNLOCK , claim/disclaim operations, timeout)
> and in order to preserve the logic of these operations at a single place
> we introduce an abstraction layer for the accesses to a given device.
> This will also be helpful in consolidating the sysfs.attribute helpers,
> that we define per driver.

Please drop the last sentence, it doesn't add to the current patch.

> 
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-catu.c  |   1 +
>  drivers/hwtracing/coresight/coresight-cti.c   |   1 +
>  drivers/hwtracing/coresight/coresight-etb10.c |   1 +
>  drivers/hwtracing/coresight/coresight-etm3x.c |   1 +
>  drivers/hwtracing/coresight/coresight-etm4x.c |   1 +
>  .../hwtracing/coresight/coresight-funnel.c    |   1 +
>  .../coresight/coresight-replicator.c          |   1 +
>  drivers/hwtracing/coresight/coresight-stm.c   |   1 +
>  drivers/hwtracing/coresight/coresight-tmc.c   |   1 +
>  drivers/hwtracing/coresight/coresight-tpiu.c  |   1 +
>  drivers/hwtracing/coresight/coresight.c       |  49 ++++++
>  include/linux/coresight.h                     | 156 ++++++++++++++++++
>  12 files changed, 215 insertions(+)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
> index 1801804a7762..6299ff7b8a14 100644
> --- a/drivers/hwtracing/coresight/coresight-catu.c
> +++ b/drivers/hwtracing/coresight/coresight-catu.c
> @@ -551,6 +551,7 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
>  	dev->platform_data = pdata;
>  
>  	drvdata->base = base;
> +	catu_desc.access.base = base;
>  	catu_desc.pdata = pdata;
>  	catu_desc.dev = dev;
>  	catu_desc.groups = catu_groups;
> diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c
> index 3ccc703dc940..c810ea3ba155 100644
> --- a/drivers/hwtracing/coresight/coresight-cti.c
> +++ b/drivers/hwtracing/coresight/coresight-cti.c
> @@ -865,6 +865,7 @@ static int cti_probe(struct amba_device *adev, const struct amba_id *id)
>  		return PTR_ERR(base);
>  
>  	drvdata->base = base;
> +	cti_desc.access.base = base;
>  
>  	dev_set_drvdata(dev, drvdata);
>  
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index 03e3f2590191..0f2735e15119 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -755,6 +755,7 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
>  		return PTR_ERR(base);
>  
>  	drvdata->base = base;
> +	desc.access.base = base;
>  
>  	spin_lock_init(&drvdata->spinlock);
>  
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
> index bf22dcfd3327..7ddcb7fcb2d6 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
> @@ -805,6 +805,7 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
>  		return PTR_ERR(base);
>  
>  	drvdata->base = base;
> +	desc.access.base = base;
>  
>  	spin_lock_init(&drvdata->spinlock);
>  
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index cb83fb77ded6..7bb74c659c4f 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -1501,6 +1501,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
>  		return PTR_ERR(base);
>  
>  	drvdata->base = base;
> +	desc.access.base = base;
>  
>  	spin_lock_init(&drvdata->spinlock);
>  
> diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
> index 900690a9f7f0..67fc3e3b77d8 100644
> --- a/drivers/hwtracing/coresight/coresight-funnel.c
> +++ b/drivers/hwtracing/coresight/coresight-funnel.c
> @@ -242,6 +242,7 @@ static int funnel_probe(struct device *dev, struct resource *res)
>  		}
>  		drvdata->base = base;
>  		desc.groups = coresight_funnel_groups;
> +		desc.access.base = base;
>  	}
>  
>  	dev_set_drvdata(dev, drvdata);
> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
> index 78acf29c49ca..65704ada20a5 100644
> --- a/drivers/hwtracing/coresight/coresight-replicator.c
> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
> @@ -254,6 +254,7 @@ static int replicator_probe(struct device *dev, struct resource *res)
>  		}
>  		drvdata->base = base;
>  		desc.groups = replicator_groups;
> +		desc.access.base = base;
>  	}
>  
>  	if (fwnode_property_present(dev_fwnode(dev),
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index 673d2f56ed1e..c8509cc78512 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -881,6 +881,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
>  	if (IS_ERR(base))
>  		return PTR_ERR(base);
>  	drvdata->base = base;
> +	desc.access.base = base;
>  
>  	ret = stm_get_stimulus_area(dev, &ch_res);
>  	if (ret)
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
> index 7040d583bed9..b49795ad6861 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc.c
> @@ -458,6 +458,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>  	}
>  
>  	drvdata->base = base;
> +	desc.access.base = base;
>  
>  	spin_lock_init(&drvdata->spinlock);
>  
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index f8583e4032a6..7ef7649f48ad 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -149,6 +149,7 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
>  		return PTR_ERR(base);
>  
>  	drvdata->base = base;
> +	desc.access.base = base;
>  
>  	/* Disable tpiu to support older devices */
>  	tpiu_disable_hw(drvdata);
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index e9c90f2de34a..38e9c03ab754 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -1387,6 +1387,54 @@ static int __init coresight_init(void)
>  }
>  postcore_initcall(coresight_init);
>  
> +u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset)
> +{
> +	return csdev_access_relaxed_read32(&csdev->access, offset);
> +}
> +
> +u32 coresight_read32(struct coresight_device *csdev, u32 offset)
> +{
> +	return csdev_access_read32(&csdev->access, offset);
> +}
> +
> +void coresight_relaxed_write32(struct coresight_device *csdev,
> +			       u32 val,
> +			       u32 offset)
> +{
> +

Extra line

> +	csdev_access_relaxed_write32(&csdev->access, val, offset);
> +}
> +
> +
> +void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset)
> +{
> +	csdev_access_write32(&csdev->access, val, offset);
> +}
> +
> +u64 coresight_relaxed_read64(struct coresight_device *csdev, u32 offset)
> +{
> +	return csdev_access_relaxed_read64(&csdev->access, offset);
> +}
> +
> +u64 coresight_read64(struct coresight_device *csdev, u32 offset)
> +{
> +	return csdev_access_read64(&csdev->access, offset);
> +}
> +
> +void coresight_relaxed_write64(struct coresight_device *csdev,
> +			       u64 val,
> +			       u32 offset)
> +{
> +

Extra line

> +	csdev_access_relaxed_write64(&csdev->access, val, offset);
> +}
> +
> +
> +void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
> +{
> +	csdev_access_write64(&csdev->access, val, offset);
> +}
> +
>  /*
>   * coresight_release_platform_data: Release references to the devices connected
>   * to the output port of this device.
> @@ -1451,6 +1499,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
>  	csdev->type = desc->type;
>  	csdev->subtype = desc->subtype;
>  	csdev->ops = desc->ops;
> +	csdev->access = desc->access;
>  	csdev->orphan = false;
>  
>  	csdev->dev.type = &coresight_dev_type[desc->type];
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 58fffdecdbfd..81ac708689f8 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -7,6 +7,7 @@
>  #define _LINUX_CORESIGHT_H
>  
>  #include <linux/device.h>
> +#include <linux/io.h>
>  #include <linux/perf_event.h>
>  #include <linux/sched.h>
>  
> @@ -114,6 +115,32 @@ struct coresight_platform_data {
>  	struct coresight_connection *conns;
>  };
>  
> +/**
> + * struct csdev_access - Abstraction of a CoreSight device access.
> + *
> + * @no_iomem	: True if the device doesn't have iomem access.
> + * @base	: When no_iomem == false, base address of the component
> + * @read	: Read from the given "offset" of the given instance.
> + * @write	: Write "val" to the given "offset".
> + */
> +struct csdev_access {
> +	bool no_iomem;

I find the no_iomen to be difficult to understand, especially when prefixed with
'!'.  Using "has_iomem" would be a lot more intuitive and would avoid extra 
mental gymnastics.

> +	union {
> +		void __iomem *base;
> +		struct {
> +			u64 (*read)(struct csdev_access *csa,
> +				    u32 offset,
> +				    bool relaxed,
> +				    bool _64bit);
> +			void (*write)(struct csdev_access *csa,
> +				      u64 val,
> +				      u32 offset,
> +				      bool relaxed,
> +				      bool _64bit);
> +		};
> +	};
> +};
> +
>  /**
>   * struct coresight_desc - description of a component required from drivers
>   * @type:	as defined by @coresight_dev_type.
> @@ -134,6 +161,7 @@ struct coresight_desc {
>  	struct device *dev;
>  	const struct attribute_group **groups;
>  	const char *name;
> +	struct csdev_access access;

No documentation

>  };
>  
>  /**
> @@ -186,6 +214,7 @@ struct coresight_sysfs_link {
>   * @def_sink:	cached reference to default sink found for this device.
>   * @ect_dev:	Associated cross trigger device. Not part of the trace data
>   *		path or connections.
> + * @csa:	Device i/o access abstraction for this device.
>   * @nr_links:   number of sysfs links created to other components from this
>   *		device. These will appear in the "connections" group.
>   * @has_conns_grp: Have added a "connections" group for sysfs links.
> @@ -205,6 +234,7 @@ struct coresight_device {
>  	struct coresight_device *def_sink;
>  	/* cross trigger handling */
>  	struct coresight_device *ect_dev;
> +	struct csdev_access access;

Documentation and field don't match.

>  	/* sysfs links between components */
>  	int nr_links;
>  	bool has_conns_grp;
> @@ -324,6 +354,79 @@ struct coresight_ops {
>  	const struct coresight_ops_ect *ect_ops;
>  };
>  
> +static inline u32 csdev_access_relaxed_read32(struct csdev_access *csa,
> +					      u32 offset)
> +{
> +	if (likely(!csa->no_iomem))
> +		return readl_relaxed(csa->base + offset);
> +	return csa->read(csa, offset, true, false);
> +}
> +
> +static inline u64 csdev_access_relaxed_read64(struct csdev_access *csa,
> +					   u32 offset)
> +{
> +	if (likely(!csa->no_iomem))
> +		return readq_relaxed(csa->base + offset);
> +	return csa->read(csa, offset, true, true);
> +}
> +
> +static inline u32 csdev_access_read32(struct csdev_access *csa, u32 offset)
> +{
> +	if (likely(!csa->no_iomem))
> +		return readl(csa->base + offset);
> +	return csa->read(csa, offset, false, false);
> +}
> +
> +static inline u64 csdev_access_read64(struct csdev_access *csa, u32 offset)
> +{
> +	if (likely(!csa->no_iomem))
> +		return readq(csa->base + offset);
> +	return csa->read(csa, offset, false, true);
> +}
> +

All of the above don't have a new line after the if() condition while the ones
below do.  Please pick a heurisitic and stick with it throughout. 

> +static inline void csdev_access_relaxed_write32(struct csdev_access *csa,
> +						u32 val,
> +						u32 offset)
> +{
> +	if (likely(!csa->no_iomem))
> +		return writel_relaxed(val, csa->base + offset);
> +
> +	return csa->write(csa, val, offset, true, false);
> +}
> +
> +static inline void csdev_access_relaxed_write64(struct csdev_access *csa,
> +					     u64 val,
> +					     u32 offset)
> +{
> +	if (likely(!csa->no_iomem))
> +		return writeq_relaxed(val, csa->base + offset);
> +
> +	return csa->write(csa, val, offset, true, true);
> +}
> +
> +static inline void csdev_access_write32(struct csdev_access *csa, u32 val, u32 offset)
> +{
> +	if (likely(!csa->no_iomem))
> +		return writel(val, csa->base + offset);
> +
> +	return csa->write(csa, val, offset, false, false);
> +}
> +
> +static inline void csdev_access_write64(struct csdev_access *csa, u64 val, u32 offset)
> +{
> +	if (likely(!csa->no_iomem))
> +		return writeq(val, csa->base + offset);
> +
> +	return csa->write(csa, val, offset, false, true);
> +}
> +
> +
> +u64 coresight_relaxed_read64(struct coresight_device *csdev, u32 offset);
> +u64 coresight_read64(struct coresight_device *csdev, u32 offset);
> +void coresight_relaxed_write64(struct coresight_device *csdev,
> +			       u64 val, u32 offset);
> +void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset);
> +
>  #ifdef CONFIG_CORESIGHT
>  extern struct coresight_device *
>  coresight_register(struct coresight_desc *desc);
> @@ -342,6 +445,14 @@ extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
>  					 struct device *dev);
>  
>  extern bool coresight_loses_context_with_cpu(struct device *dev);
> +
> +u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset);
> +u32 coresight_read32(struct coresight_device *csdev, u32 offset);
> +void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset);
> +void coresight_relaxed_write32(struct coresight_device *csdev,
> +			       u32 val,
> +			       u32 offset);
> +

Why are the 64 bit version outside of the #ifdef and the 32 bit within?

>  #else
>  static inline struct coresight_device *
>  coresight_register(struct coresight_desc *desc) { return NULL; }
> @@ -368,6 +479,51 @@ static inline bool coresight_loses_context_with_cpu(struct device *dev)
>  {
>  	return false;
>  }
> +
> +static inline u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset)
> +{
> +	WARN_ON_ONCE(1);
> +	return 0;
> +}
> +
> +static inline u32 coresight_read32(struct coresight_device *csdev, u32 offset)
> +{
> +	WARN_ON_ONCE(1);
> +	return 0;
> +}
> +
> +static void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset)
> +{
> +}
> +
> +static void coresight_relaxed_write32(struct coresight_device *csdev,
> +				      u32 val, u32 offset);
> +{
> +}
> +
> +static inline u64 coresight_relaxed_read64(struct coresight_device *csdev,
> +					   u32 offset)
> +{
> +	WARN_ON_ONCE(1);
> +	return 0;
> +}
> +
> +static inline u64 coresight_read64(struct coresight_device *csdev, u32 offset)
> +{
> +	WARN_ON_ONCE(1);

Not sure about the motivation behind using WARN_ON_ONCE(), and only in the read
functions.  I would simply return 0 here.  After all if CONFIG_CORESIGHT is not
defined they won't make it very far.

> +	return 0;
> +}
> +
> +static inline void coresight_relaxed_write64(struct coresight_device *csdev,
> +					     u64 val,
> +					     u32 offset)
> +{
> +}
> +
> +static inline void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
> +{
> +}
> +
>  #endif

I will likely come back to this patch once I have reviewed the rest of the set.

>  
>  extern int coresight_get_cpu(struct device *dev);
> -- 
> 2.24.1
> 

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Re: [RFC PATCH 02/14] coresight: Introduce device access abstraction

[Suzuki K Poulose]

On 07/29/2020 08:56 PM, Mathieu Poirier wrote:
> On Wed, Jul 22, 2020 at 06:20:28PM +0100, Suzuki K Poulose wrote:
>> We are about to introduce support for sysreg access to ETMv4.4+
>> component. Since there are generic routines that access the
>> registers (e.g, CS_LOCK/UNLOCK , claim/disclaim operations, timeout)
>> and in order to preserve the logic of these operations at a single place
>> we introduce an abstraction layer for the accesses to a given device.
>> This will also be helpful in consolidating the sysfs.attribute helpers,
>> that we define per driver.
> 
> Please drop the last sentence, it doesn't add to the current patch.
> 

Sure.

>> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
>> index e9c90f2de34a..38e9c03ab754 100644
>> --- a/drivers/hwtracing/coresight/coresight.c
>> +++ b/drivers/hwtracing/coresight/coresight.c
>> @@ -1387,6 +1387,54 @@ static int __init coresight_init(void)
>>   }

...

>>    * coresight_release_platform_data: Release references to the devices connected
>>    * to the output port of this device.
>> @@ -1451,6 +1499,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
>>   	csdev->type = desc->type;
>>   	csdev->subtype = desc->subtype;
>>   	csdev->ops = desc->ops;
>> +	csdev->access = desc->access;
>>   	csdev->orphan = false;
>>   
>>   	csdev->dev.type = &coresight_dev_type[desc->type];
>> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
>> index 58fffdecdbfd..81ac708689f8 100644
>> --- a/include/linux/coresight.h
>> +++ b/include/linux/coresight.h
>> @@ -7,6 +7,7 @@
>>   #define _LINUX_CORESIGHT_H
>>   
>>   #include <linux/device.h>
>> +#include <linux/io.h>
>>   #include <linux/perf_event.h>
>>   #include <linux/sched.h>
>>   
>> @@ -114,6 +115,32 @@ struct coresight_platform_data {
>>   	struct coresight_connection *conns;
>>   };
>>   
>> +/**
>> + * struct csdev_access - Abstraction of a CoreSight device access.
>> + *
>> + * @no_iomem	: True if the device doesn't have iomem access.
>> + * @base	: When no_iomem == false, base address of the component
>> + * @read	: Read from the given "offset" of the given instance.
>> + * @write	: Write "val" to the given "offset".
>> + */
>> +struct csdev_access {
>> +	bool no_iomem;
> 
> I find the no_iomen to be difficult to understand, especially when prefixed with
> '!'.  Using "has_iomem" would be a lot more intuitive and would avoid extra
> mental gymnastics.


I agree. That was a bit of laziness in part, to limit the changes to the
existing drivers, where almost everyone, except the ETM would need to
simply use the MMIO approach. So, in order to keep those changes to
minimum, i.e, simply initialize the base, I used the inverted logic.
I will fix it.



>> +u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset);
>> +u32 coresight_read32(struct coresight_device *csdev, u32 offset);
>> +void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset);
>> +void coresight_relaxed_write32(struct coresight_device *csdev,
>> +			       u32 val,
>> +			       u32 offset);
>> +
> 
> Why are the 64 bit version outside of the #ifdef and the 32 bit within?

Mistake ;-). I will address all of the comments above in my next version.

...


>> +static inline u64 coresight_read64(struct coresight_device *csdev, u32 offset)
>> +{
>> +	WARN_ON_ONCE(1);
> 
> Not sure about the motivation behind using WARN_ON_ONCE(), and only in the read
> functions.  I would simply return 0 here.  After all if CONFIG_CORESIGHT is not
> defined they won't make it very far.
> 

If someone is reading the values, they might do something with the
value, i.e, make a decision when they shouldn't. This is just to prevent
such cases.

>> +	return 0;
>> +}
>> +
>> +static inline void coresight_relaxed_write64(struct coresight_device *csdev,
>> +					     u64 val,
>> +					     u32 offset)
>> +{
>> +}
>> +
>> +static inline void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
>> +{
>> +}
>> +
>>   #endif
> 
> I will likely come back to this patch once I have reviewed the rest of the set.
> 

Sure. I am looking for thoughts on the proposed API (not ABI) changes,
as they are quite significant and invasive changes in the code, without
much functionality changes.


Thank you for the review !

Suzuki

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[RFC PATCH 03/14] coresight: tpiu: Use coresight device access abstraction

[Suzuki K Poulose]

TPIU driver access the device before the coresight device
is registered. In other words, before the drvdata->csdev
is valid. Thus, we need to make sure that the csdev_access
is valid for both the invocations. Switch to using the
csdev_access directly instead of relying on availability
of drvdata->csdev.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-tpiu.c | 30 +++++++++-----------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index 7ef7649f48ad..84ff4bf5d3b8 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -60,49 +60,45 @@ struct tpiu_drvdata {
 	struct coresight_device	*csdev;
 };
 
-static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
+static void tpiu_enable_hw(struct csdev_access *csa)
 {
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(csa->base);
 
 	/* TODO: fill this up */
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(csa->base);
 }
 
 static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused)
 {
-	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
-
-	tpiu_enable_hw(drvdata);
+	tpiu_enable_hw(&csdev->access);
 	atomic_inc(csdev->refcnt);
 	dev_dbg(&csdev->dev, "TPIU enabled\n");
 	return 0;
 }
 
-static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
+static void tpiu_disable_hw(struct csdev_access *csa)
 {
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(csa->base);
 
 	/* Clear formatter and stop on flush */
-	writel_relaxed(FFCR_STOP_FI, drvdata->base + TPIU_FFCR);
+	csdev_access_relaxed_write32(csa, FFCR_STOP_FI, TPIU_FFCR);
 	/* Generate manual flush */
-	writel_relaxed(FFCR_STOP_FI | FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
+	csdev_access_relaxed_write32(csa, FFCR_STOP_FI | FFCR_FON_MAN, TPIU_FFCR);
 	/* Wait for flush to complete */
-	coresight_timeout(drvdata->base, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
+	coresight_timeout(csa->base, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
 	/* Wait for formatter to stop */
-	coresight_timeout(drvdata->base, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
+	coresight_timeout(csa->base, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(csa->base);
 }
 
 static int tpiu_disable(struct coresight_device *csdev)
 {
-	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
-
 	if (atomic_dec_return(csdev->refcnt))
 		return -EBUSY;
 
-	tpiu_disable_hw(drvdata);
+	tpiu_disable_hw(&csdev->access);
 
 	dev_dbg(&csdev->dev, "TPIU disabled\n");
 	return 0;
@@ -152,7 +148,7 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.access.base = base;
 
 	/* Disable tpiu to support older devices */
-	tpiu_disable_hw(drvdata);
+	tpiu_disable_hw(&desc.access);
 
 	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
-- 
2.24.1


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Re: [RFC PATCH 03/14] coresight: tpiu: Use coresight device access abstraction

[Mathieu Poirier]

On Wed, Jul 22, 2020 at 06:20:29PM +0100, Suzuki K Poulose wrote:
> TPIU driver access the device before the coresight device
> is registered. In other words, before the drvdata->csdev
> is valid. Thus, we need to make sure that the csdev_access
> is valid for both the invocations. Switch to using the
> csdev_access directly instead of relying on availability
> of drvdata->csdev.

I'm not sure all of the above is needed and based on the wording I could easily
see this patch being selected for stable backport, which would be a mistak. 

The gist of this patch is that we are moving to the access abstraction and the
changelog should reflect that.

> 
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-tpiu.c | 30 +++++++++-----------
>  1 file changed, 13 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index 7ef7649f48ad..84ff4bf5d3b8 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -60,49 +60,45 @@ struct tpiu_drvdata {
>  	struct coresight_device	*csdev;
>  };
>  
> -static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
> +static void tpiu_enable_hw(struct csdev_access *csa)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(csa->base);
>  
>  	/* TODO: fill this up */
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(csa->base);
>  }
>  
>  static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused)
>  {
> -	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> -
> -	tpiu_enable_hw(drvdata);
> +	tpiu_enable_hw(&csdev->access);
>  	atomic_inc(csdev->refcnt);
>  	dev_dbg(&csdev->dev, "TPIU enabled\n");
>  	return 0;
>  }
>  
> -static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
> +static void tpiu_disable_hw(struct csdev_access *csa)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(csa->base);
>  
>  	/* Clear formatter and stop on flush */
> -	writel_relaxed(FFCR_STOP_FI, drvdata->base + TPIU_FFCR);
> +	csdev_access_relaxed_write32(csa, FFCR_STOP_FI, TPIU_FFCR);
>  	/* Generate manual flush */
> -	writel_relaxed(FFCR_STOP_FI | FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
> +	csdev_access_relaxed_write32(csa, FFCR_STOP_FI | FFCR_FON_MAN, TPIU_FFCR);
>  	/* Wait for flush to complete */
> -	coresight_timeout(drvdata->base, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
> +	coresight_timeout(csa->base, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
>  	/* Wait for formatter to stop */
> -	coresight_timeout(drvdata->base, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
> +	coresight_timeout(csa->base, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(csa->base);
>  }
>  
>  static int tpiu_disable(struct coresight_device *csdev)
>  {
> -	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> -
>  	if (atomic_dec_return(csdev->refcnt))
>  		return -EBUSY;
>  
> -	tpiu_disable_hw(drvdata);
> +	tpiu_disable_hw(&csdev->access);
>  
>  	dev_dbg(&csdev->dev, "TPIU disabled\n");
>  	return 0;
> @@ -152,7 +148,7 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
>  	desc.access.base = base;

Any reason for introducing the above in patch 02?  I would have done that as
part of this patch...  Also part of this patch I would remove drvdata::base
since it is no longer needed.

I'm out of time for today - I will continue tomorrow.

Regards,
Mathieu

>  
>  	/* Disable tpiu to support older devices */
> -	tpiu_disable_hw(drvdata);
> +	tpiu_disable_hw(&desc.access);
>  
>  	pdata = coresight_get_platform_data(dev);
>  	if (IS_ERR(pdata))
> -- 
> 2.24.1
> 

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Re: [RFC PATCH 03/14] coresight: tpiu: Use coresight device access abstraction

[Suzuki K Poulose]

On 07/29/2020 10:01 PM, Mathieu Poirier wrote:
> On Wed, Jul 22, 2020 at 06:20:29PM +0100, Suzuki K Poulose wrote:
>> TPIU driver access the device before the coresight device
>> is registered. In other words, before the drvdata->csdev
>> is valid. Thus, we need to make sure that the csdev_access
>> is valid for both the invocations. Switch to using the
>> csdev_access directly instead of relying on availability
>> of drvdata->csdev.
> 
> I'm not sure all of the above is needed and based on the wording I could easily
> see this patch being selected for stable backport, which would be a mistak.
> 
> The gist of this patch is that we are moving to the access abstraction and the
> changelog should reflect that.

True, I will make it something like :

"Prepare the TPIU driver to make use of the CoreSight device access
abstraction layer. The driver touches the device even before the
coresight device is registered. Thus we could be accessing the
devices without a csdev. As we are about to use the abstraction
layer for accessing the device, pass in the access directly
to avoid having to deal with the un-initialised csdev.


>>   
>>   static int tpiu_disable(struct coresight_device *csdev)
>>   {
>> -	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>> -
>>   	if (atomic_dec_return(csdev->refcnt))
>>   		return -EBUSY;
>>   
>> -	tpiu_disable_hw(drvdata);
>> +	tpiu_disable_hw(&csdev->access);
>>   
>>   	dev_dbg(&csdev->dev, "TPIU disabled\n");
>>   	return 0;
>> @@ -152,7 +148,7 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
>>   	desc.access.base = base;
> 
> Any reason for introducing the above in patch 02?  I would have done that as
> part of this patch...  Also part of this patch I would remove drvdata::base
> since it is no longer needed.

The patch 02 is not touching how the individual drivers access the
device, yet. It only sets the way by introducing the layer. As per
the proposed change, this is a preparation of the TPIU driver, so
that we can convert the generic helper functions ( coresight_timeout())
more easily and keep the patch 05 easier for review (just like the Patch
4, which prepares the ETM driver).

Cheers
Suzuki


> 
> I'm out of time for today - I will continue tomorrow.
> 
> Regards,
> Mathieu
> 
>>   
>>   	/* Disable tpiu to support older devices */
>> -	tpiu_disable_hw(drvdata);
>> +	tpiu_disable_hw(&desc.access);
>>   
>>   	pdata = coresight_get_platform_data(dev);
>>   	if (IS_ERR(pdata))
>> -- 
>> 2.24.1
>>


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[RFC PATCH 04/14] coresight: etm4x: Free up argument of etm4_init_arch_data

[Suzuki K Poulose]

etm4_init_arch_data is called early during the device probe,
even before the coresight_device is registered. Since we are
about to replace the direct access via abstraction layer, we
need a way to pass in the csdev_access for the given device.
Towards this free up the argument, which is already available
via etmdrvdata[smp_processor_id()].

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 7bb74c659c4f..67deb4a4e618 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -614,7 +614,8 @@ static const struct coresight_ops etm4_cs_ops = {
 	.source_ops	= &etm4_source_ops,
 };
 
-static void etm4_init_arch_data(void *info)
+
+static void etm4_init_arch_data(void *__unused)
 {
 	u32 etmidr0;
 	u32 etmidr1;
@@ -622,8 +623,14 @@ static void etm4_init_arch_data(void *info)
 	u32 etmidr3;
 	u32 etmidr4;
 	u32 etmidr5;
-	struct etmv4_drvdata *drvdata = info;
-	int i;
+	struct etmv4_drvdata *drvdata;
+	int i, cpu;
+
+	cpu = raw_smp_processor_id();
+	drvdata = etmdrvdata[cpu];
+
+	if (WARN_ON(!etmdrvdata[cpu]))
+		return;
 
 	/* Make sure all registers are accessible */
 	etm4_os_unlock(drvdata);
@@ -1517,7 +1524,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	etmdrvdata[drvdata->cpu] = drvdata;
 
 	if (smp_call_function_single(drvdata->cpu,
-				etm4_init_arch_data,  drvdata, 1))
+				etm4_init_arch_data,  NULL, 1))
 		dev_err(dev, "ETM arch init failed\n");
 
 	ret = etm4_pm_setup_cpuslocked();
-- 
2.24.1


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Re: [RFC PATCH 04/14] coresight: etm4x: Free up argument of etm4_init_arch_data

[Mathieu Poirier]

On Wed, Jul 22, 2020 at 06:20:30PM +0100, Suzuki K Poulose wrote:
> etm4_init_arch_data is called early during the device probe,
> even before the coresight_device is registered. Since we are
> about to replace the direct access via abstraction layer, we
> need a way to pass in the csdev_access for the given device.
> Towards this free up the argument, which is already available
> via etmdrvdata[smp_processor_id()].
> 
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-etm4x.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index 7bb74c659c4f..67deb4a4e618 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -614,7 +614,8 @@ static const struct coresight_ops etm4_cs_ops = {
>  	.source_ops	= &etm4_source_ops,
>  };
>  
> -static void etm4_init_arch_data(void *info)
> +
> +static void etm4_init_arch_data(void *__unused)
>  {
>  	u32 etmidr0;
>  	u32 etmidr1;
> @@ -622,8 +623,14 @@ static void etm4_init_arch_data(void *info)
>  	u32 etmidr3;
>  	u32 etmidr4;
>  	u32 etmidr5;
> -	struct etmv4_drvdata *drvdata = info;
> -	int i;
> +	struct etmv4_drvdata *drvdata;
> +	int i, cpu;
> +
> +	cpu = raw_smp_processor_id();

Can you provide details on the motivation to use the raw_ version over the regular
one?  As far as I can see in linux/smp.h there is no difference between them
unless DEBUB_PREEMPT is enabled.  Even then the debug version won't complain
since the task is CPU affined.

> +	drvdata = etmdrvdata[cpu];
> +
> +	if (WARN_ON(!etmdrvdata[cpu]))
> +		return;
>  
>  	/* Make sure all registers are accessible */
>  	etm4_os_unlock(drvdata);
> @@ -1517,7 +1524,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
>  	etmdrvdata[drvdata->cpu] = drvdata;
>  
>  	if (smp_call_function_single(drvdata->cpu,
> -				etm4_init_arch_data,  drvdata, 1))
> +				etm4_init_arch_data,  NULL, 1))
>  		dev_err(dev, "ETM arch init failed\n");
>  
>  	ret = etm4_pm_setup_cpuslocked();
> -- 
> 2.24.1
> 

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Re: [RFC PATCH 04/14] coresight: etm4x: Free up argument of etm4_init_arch_data

[Suzuki K Poulose]

On 07/30/2020 06:31 PM, Mathieu Poirier wrote:
> On Wed, Jul 22, 2020 at 06:20:30PM +0100, Suzuki K Poulose wrote:
>> etm4_init_arch_data is called early during the device probe,
>> even before the coresight_device is registered. Since we are
>> about to replace the direct access via abstraction layer, we
>> need a way to pass in the csdev_access for the given device.
>> Towards this free up the argument, which is already available
>> via etmdrvdata[smp_processor_id()].
>>
>> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
>> Cc: Mike Leach <mike.leach@linaro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-etm4x.c | 15 +++++++++++----
>>   1 file changed, 11 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
>> index 7bb74c659c4f..67deb4a4e618 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
>> @@ -614,7 +614,8 @@ static const struct coresight_ops etm4_cs_ops = {
>>   	.source_ops	= &etm4_source_ops,
>>   };
>>   
>> -static void etm4_init_arch_data(void *info)
>> +
>> +static void etm4_init_arch_data(void *__unused)
>>   {
>>   	u32 etmidr0;
>>   	u32 etmidr1;
>> @@ -622,8 +623,14 @@ static void etm4_init_arch_data(void *info)
>>   	u32 etmidr3;
>>   	u32 etmidr4;
>>   	u32 etmidr5;
>> -	struct etmv4_drvdata *drvdata = info;
>> -	int i;
>> +	struct etmv4_drvdata *drvdata;
>> +	int i, cpu;
>> +
>> +	cpu = raw_smp_processor_id();
> 
> Can you provide details on the motivation to use the raw_ version over the regular
> one?  As far as I can see in linux/smp.h there is no difference between them
> unless DEBUB_PREEMPT is enabled.  Even then the debug version won't complain
> since the task is CPU affined.
> 

Right, it is partly my misunderstanding. debug_smp_processor_id() is to
detect cases where smp_processor_id() is called in pre-emptible
contexts. This is not the case here. So it is fine to use the
smp_processor_id(). I will switch to that in the next version.

Thanks
Suzuki

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[RFC PATCH 05/14] coresight: Convert coresight_timeout to use access abstraction

[Suzuki K Poulose]

Convert the generic routines to use the new access abstraction layer
gradually, starting with coresigth_timeout.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-catu.c  |  2 +-
 drivers/hwtracing/coresight/coresight-etb10.c |  5 +++--
 drivers/hwtracing/coresight/coresight-etm4x.c | 12 +++++++-----
 drivers/hwtracing/coresight/coresight-stm.c   |  2 +-
 drivers/hwtracing/coresight/coresight-tmc.c   |  9 ++++++---
 drivers/hwtracing/coresight/coresight-tpiu.c  |  4 ++--
 drivers/hwtracing/coresight/coresight.c       | 15 +++++++++------
 include/linux/coresight.h                     | 17 +++++++++++++----
 8 files changed, 42 insertions(+), 24 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 6299ff7b8a14..30f037d4549d 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -401,7 +401,7 @@ static const struct attribute_group *catu_groups[] = {
 
 static inline int catu_wait_for_ready(struct catu_drvdata *drvdata)
 {
-	return coresight_timeout(drvdata->base,
+	return coresight_timeout(&drvdata->csdev->access,
 				 CATU_STATUS, CATU_STATUS_READY, 1);
 }
 
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 0f2735e15119..507f63c51be5 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -251,6 +251,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
 {
 	u32 ffcr;
 	struct device *dev = &drvdata->csdev->dev;
+	struct coresight_device *csdev = drvdata->csdev;
 
 	CS_UNLOCK(drvdata->base);
 
@@ -262,7 +263,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
 	ffcr |= ETB_FFCR_FON_MAN;
 	writel_relaxed(ffcr, drvdata->base + ETB_FFCR);
 
-	if (coresight_timeout(drvdata->base, ETB_FFCR, ETB_FFCR_BIT, 0)) {
+	if (coresight_timeout(&csdev->access, ETB_FFCR, ETB_FFCR_BIT, 0)) {
 		dev_err(dev,
 		"timeout while waiting for completion of Manual Flush\n");
 	}
@@ -270,7 +271,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
 	/* disable trace capture */
 	writel_relaxed(0x0, drvdata->base + ETB_CTL_REG);
 
-	if (coresight_timeout(drvdata->base, ETB_FFSR, ETB_FFSR_BIT, 1)) {
+	if (coresight_timeout(&csdev->access, ETB_FFSR, ETB_FFSR_BIT, 1)) {
 		dev_err(dev,
 			"timeout while waiting for Formatter to Stop\n");
 	}
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 67deb4a4e618..d78d79940fc9 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -109,6 +109,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
 	int i, rc;
 	struct etmv4_config *config = &drvdata->config;
 	struct device *etm_dev = &drvdata->csdev->dev;
+	struct coresight_device *csdev = drvdata->csdev;
 
 	CS_UNLOCK(drvdata->base);
 
@@ -122,7 +123,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
 	writel_relaxed(0, drvdata->base + TRCPRGCTLR);
 
 	/* wait for TRCSTATR.IDLE to go up */
-	if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
+	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
 		dev_err(etm_dev,
 			"timeout while waiting for Idle Trace Status\n");
 
@@ -209,7 +210,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
 	writel_relaxed(1, drvdata->base + TRCPRGCTLR);
 
 	/* wait for TRCSTATR.IDLE to go back down to '0' */
-	if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
+	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
 		dev_err(etm_dev,
 			"timeout while waiting for Idle Trace Status\n");
 
@@ -474,6 +475,7 @@ static void etm4_disable_hw(void *info)
 	struct etmv4_drvdata *drvdata = info;
 	struct etmv4_config *config = &drvdata->config;
 	struct device *etm_dev = &drvdata->csdev->dev;
+	struct coresight_device *csdev = drvdata->csdev;
 	int i;
 
 	CS_UNLOCK(drvdata->base);
@@ -500,7 +502,7 @@ static void etm4_disable_hw(void *info)
 	writel_relaxed(control, drvdata->base + TRCPRGCTLR);
 
 	/* wait for TRCSTATR.PMSTABLE to go to '1' */
-	if (coresight_timeout(drvdata->base, TRCSTATR,
+	if (coresight_timeout(&csdev->access, TRCSTATR,
 			      TRCSTATR_PMSTABLE_BIT, 1))
 		dev_err(etm_dev,
 			"timeout while waiting for PM stable Trace Status\n");
@@ -1163,7 +1165,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 	etm4_os_lock(drvdata);
 
 	/* wait for TRCSTATR.PMSTABLE to go up */
-	if (coresight_timeout(drvdata->base, TRCSTATR,
+	if (coresight_timeout(&csdev->access, TRCSTATR,
 			      TRCSTATR_PMSTABLE_BIT, 1)) {
 		dev_err(etm_dev,
 			"timeout while waiting for PM Stable Status\n");
@@ -1247,7 +1249,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 	state->trcpdcr = readl(drvdata->base + TRCPDCR);
 
 	/* wait for TRCSTATR.IDLE to go up */
-	if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
+	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
 		dev_err(etm_dev,
 			"timeout while waiting for Idle Trace Status\n");
 		etm4_os_unlock(drvdata);
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index c8509cc78512..b704000c96b8 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -270,7 +270,7 @@ static void stm_disable(struct coresight_device *csdev,
 		spin_unlock(&drvdata->spinlock);
 
 		/* Wait until the engine has completely stopped */
-		coresight_timeout(drvdata->base, STMTCSR, STMTCSR_BUSY_BIT, 0);
+		coresight_timeout(&csdev->access, STMTCSR, STMTCSR_BUSY_BIT, 0);
 
 		pm_runtime_put(csdev->dev.parent);
 
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index b49795ad6861..6036eb73dce8 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -33,16 +33,19 @@ DEFINE_CORESIGHT_DEVLIST(etr_devs, "tmc_etr");
 
 void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
 {
+	struct coresight_device *csdev = drvdata->csdev;
+
 	/* Ensure formatter, unformatter and hardware fifo are empty */
-	if (coresight_timeout(drvdata->base,
+	if (coresight_timeout(&csdev->access,
 			      TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
-		dev_err(&drvdata->csdev->dev,
+		dev_err(&csdev->dev,
 			"timeout while waiting for TMC to be Ready\n");
 	}
 }
 
 void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
 {
+	struct coresight_device *csdev = drvdata->csdev;
 	u32 ffcr;
 
 	ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
@@ -51,7 +54,7 @@ void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
 	ffcr |= BIT(TMC_FFCR_FLUSHMAN_BIT);
 	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
 	/* Ensure flush completes */
-	if (coresight_timeout(drvdata->base,
+	if (coresight_timeout(&csdev->access,
 			      TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
 		dev_err(&drvdata->csdev->dev,
 		"timeout while waiting for completion of Manual Flush\n");
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index 84ff4bf5d3b8..282d80e97265 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -86,9 +86,9 @@ static void tpiu_disable_hw(struct csdev_access *csa)
 	/* Generate manual flush */
 	csdev_access_relaxed_write32(csa, FFCR_STOP_FI | FFCR_FON_MAN, TPIU_FFCR);
 	/* Wait for flush to complete */
-	coresight_timeout(csa->base, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
+	coresight_timeout(csa, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
 	/* Wait for formatter to stop */
-	coresight_timeout(csa->base, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
+	coresight_timeout(csa, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
 
 	CS_LOCK(csa->base);
 }
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 38e9c03ab754..21e7615fcbc8 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1338,23 +1338,26 @@ static void coresight_remove_conns(struct coresight_device *csdev)
 }
 
 /**
- * coresight_timeout - loop until a bit has changed to a specific state.
- * @addr: base address of the area of interest.
- * @offset: address of a register, starting from @addr.
+ * coresight_timeout - loop until a bit has changed to a specific register
+ *			state.
+ * @csa: coresight device access for the device
+ * @offset: Offset of the register from the base of the device.
  * @position: the position of the bit of interest.
  * @value: the value the bit should have.
  *
  * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
  * TIMEOUT_US has elapsed, which ever happens first.
  */
-
-int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
+int coresight_timeout(struct csdev_access *csa,
+		      u32 offset,
+		      int position,
+		      int value)
 {
 	int i;
 	u32 val;
 
 	for (i = TIMEOUT_US; i > 0; i--) {
-		val = __raw_readl(addr + offset);
+		val = csdev_access_read32(csa, offset);
 		/* waiting on the bit to go from 0 to 1 */
 		if (value) {
 			if (val & BIT(position))
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 81ac708689f8..2989306f6041 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -433,8 +433,10 @@ coresight_register(struct coresight_desc *desc);
 extern void coresight_unregister(struct coresight_device *csdev);
 extern int coresight_enable(struct coresight_device *csdev);
 extern void coresight_disable(struct coresight_device *csdev);
-extern int coresight_timeout(void __iomem *addr, u32 offset,
-			     int position, int value);
+extern int coresight_timeout(struct csdev_access *csa,
+			     u32 offset,
+			     int position,
+			     int value);
 
 extern int coresight_claim_device(void __iomem *base);
 extern int coresight_claim_device_unlocked(void __iomem *base);
@@ -460,8 +462,15 @@ static inline void coresight_unregister(struct coresight_device *csdev) {}
 static inline int
 coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
 static inline void coresight_disable(struct coresight_device *csdev) {}
-static inline int coresight_timeout(void __iomem *addr, u32 offset,
-				     int position, int value) { return 1; }
+
+static inline int coresight_timeout(struct csdev_access *csa,
+				    u32 offset,
+				    int position,
+				    int value)
+{
+	return 1;
+}
+
 static inline int coresight_claim_device_unlocked(void __iomem *base)
 {
 	return -EINVAL;
-- 
2.24.1


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Re: [RFC PATCH 05/14] coresight: Convert coresight_timeout to use access abstraction

[Mathieu Poirier]

On Wed, Jul 22, 2020 at 06:20:31PM +0100, Suzuki K Poulose wrote:
> Convert the generic routines to use the new access abstraction layer
> gradually, starting with coresigth_timeout.
> 
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-catu.c  |  2 +-
>  drivers/hwtracing/coresight/coresight-etb10.c |  5 +++--
>  drivers/hwtracing/coresight/coresight-etm4x.c | 12 +++++++-----
>  drivers/hwtracing/coresight/coresight-stm.c   |  2 +-
>  drivers/hwtracing/coresight/coresight-tmc.c   |  9 ++++++---
>  drivers/hwtracing/coresight/coresight-tpiu.c  |  4 ++--
>  drivers/hwtracing/coresight/coresight.c       | 15 +++++++++------
>  include/linux/coresight.h                     | 17 +++++++++++++----
>  8 files changed, 42 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
> index 6299ff7b8a14..30f037d4549d 100644
> --- a/drivers/hwtracing/coresight/coresight-catu.c
> +++ b/drivers/hwtracing/coresight/coresight-catu.c
> @@ -401,7 +401,7 @@ static const struct attribute_group *catu_groups[] = {
>  
>  static inline int catu_wait_for_ready(struct catu_drvdata *drvdata)
>  {
> -	return coresight_timeout(drvdata->base,
> +	return coresight_timeout(&drvdata->csdev->access,
>  				 CATU_STATUS, CATU_STATUS_READY, 1);
>  }
>  
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index 0f2735e15119..507f63c51be5 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -251,6 +251,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
>  {
>  	u32 ffcr;
>  	struct device *dev = &drvdata->csdev->dev;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
>  	CS_UNLOCK(drvdata->base);
>  
> @@ -262,7 +263,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
>  	ffcr |= ETB_FFCR_FON_MAN;
>  	writel_relaxed(ffcr, drvdata->base + ETB_FFCR);
>  
> -	if (coresight_timeout(drvdata->base, ETB_FFCR, ETB_FFCR_BIT, 0)) {
> +	if (coresight_timeout(&csdev->access, ETB_FFCR, ETB_FFCR_BIT, 0)) {
>  		dev_err(dev,
>  		"timeout while waiting for completion of Manual Flush\n");
>  	}
> @@ -270,7 +271,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
>  	/* disable trace capture */
>  	writel_relaxed(0x0, drvdata->base + ETB_CTL_REG);
>  
> -	if (coresight_timeout(drvdata->base, ETB_FFSR, ETB_FFSR_BIT, 1)) {
> +	if (coresight_timeout(&csdev->access, ETB_FFSR, ETB_FFSR_BIT, 1)) {
>  		dev_err(dev,
>  			"timeout while waiting for Formatter to Stop\n");
>  	}
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index 67deb4a4e618..d78d79940fc9 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -109,6 +109,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
>  	int i, rc;
>  	struct etmv4_config *config = &drvdata->config;
>  	struct device *etm_dev = &drvdata->csdev->dev;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
>  	CS_UNLOCK(drvdata->base);
>  
> @@ -122,7 +123,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
>  	writel_relaxed(0, drvdata->base + TRCPRGCTLR);
>  
>  	/* wait for TRCSTATR.IDLE to go up */
> -	if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
> +	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
>  		dev_err(etm_dev,
>  			"timeout while waiting for Idle Trace Status\n");
>  
> @@ -209,7 +210,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
>  	writel_relaxed(1, drvdata->base + TRCPRGCTLR);
>  
>  	/* wait for TRCSTATR.IDLE to go back down to '0' */
> -	if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
> +	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
>  		dev_err(etm_dev,
>  			"timeout while waiting for Idle Trace Status\n");
>  
> @@ -474,6 +475,7 @@ static void etm4_disable_hw(void *info)
>  	struct etmv4_drvdata *drvdata = info;
>  	struct etmv4_config *config = &drvdata->config;
>  	struct device *etm_dev = &drvdata->csdev->dev;
> +	struct coresight_device *csdev = drvdata->csdev;
>  	int i;
>  
>  	CS_UNLOCK(drvdata->base);
> @@ -500,7 +502,7 @@ static void etm4_disable_hw(void *info)
>  	writel_relaxed(control, drvdata->base + TRCPRGCTLR);
>  
>  	/* wait for TRCSTATR.PMSTABLE to go to '1' */
> -	if (coresight_timeout(drvdata->base, TRCSTATR,
> +	if (coresight_timeout(&csdev->access, TRCSTATR,
>  			      TRCSTATR_PMSTABLE_BIT, 1))
>  		dev_err(etm_dev,
>  			"timeout while waiting for PM stable Trace Status\n");
> @@ -1163,7 +1165,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  	etm4_os_lock(drvdata);
>  
>  	/* wait for TRCSTATR.PMSTABLE to go up */
> -	if (coresight_timeout(drvdata->base, TRCSTATR,
> +	if (coresight_timeout(&csdev->access, TRCSTATR,
>  			      TRCSTATR_PMSTABLE_BIT, 1)) {
>  		dev_err(etm_dev,
>  			"timeout while waiting for PM Stable Status\n");
> @@ -1247,7 +1249,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  	state->trcpdcr = readl(drvdata->base + TRCPDCR);
>  
>  	/* wait for TRCSTATR.IDLE to go up */
> -	if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
> +	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
>  		dev_err(etm_dev,
>  			"timeout while waiting for Idle Trace Status\n");
>  		etm4_os_unlock(drvdata);
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index c8509cc78512..b704000c96b8 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -270,7 +270,7 @@ static void stm_disable(struct coresight_device *csdev,
>  		spin_unlock(&drvdata->spinlock);
>  
>  		/* Wait until the engine has completely stopped */
> -		coresight_timeout(drvdata->base, STMTCSR, STMTCSR_BUSY_BIT, 0);
> +		coresight_timeout(&csdev->access, STMTCSR, STMTCSR_BUSY_BIT, 0);
>  
>  		pm_runtime_put(csdev->dev.parent);
>  
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
> index b49795ad6861..6036eb73dce8 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc.c
> @@ -33,16 +33,19 @@ DEFINE_CORESIGHT_DEVLIST(etr_devs, "tmc_etr");
>  
>  void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
>  {
> +	struct coresight_device *csdev = drvdata->csdev;
> +
>  	/* Ensure formatter, unformatter and hardware fifo are empty */
> -	if (coresight_timeout(drvdata->base,
> +	if (coresight_timeout(&csdev->access,
>  			      TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
> -		dev_err(&drvdata->csdev->dev,
> +		dev_err(&csdev->dev,
>  			"timeout while waiting for TMC to be Ready\n");
>  	}
>  }
>  
>  void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
>  {
> +	struct coresight_device *csdev = drvdata->csdev;
>  	u32 ffcr;
>  
>  	ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
> @@ -51,7 +54,7 @@ void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
>  	ffcr |= BIT(TMC_FFCR_FLUSHMAN_BIT);
>  	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
>  	/* Ensure flush completes */
> -	if (coresight_timeout(drvdata->base,
> +	if (coresight_timeout(&csdev->access,
>  			      TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
>  		dev_err(&drvdata->csdev->dev,
>  		"timeout while waiting for completion of Manual Flush\n");
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index 84ff4bf5d3b8..282d80e97265 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -86,9 +86,9 @@ static void tpiu_disable_hw(struct csdev_access *csa)
>  	/* Generate manual flush */
>  	csdev_access_relaxed_write32(csa, FFCR_STOP_FI | FFCR_FON_MAN, TPIU_FFCR);
>  	/* Wait for flush to complete */
> -	coresight_timeout(csa->base, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
> +	coresight_timeout(csa, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
>  	/* Wait for formatter to stop */
> -	coresight_timeout(csa->base, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
> +	coresight_timeout(csa, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
>  
>  	CS_LOCK(csa->base);
>  }
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index 38e9c03ab754..21e7615fcbc8 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -1338,23 +1338,26 @@ static void coresight_remove_conns(struct coresight_device *csdev)
>  }
>  
>  /**
> - * coresight_timeout - loop until a bit has changed to a specific state.
> - * @addr: base address of the area of interest.
> - * @offset: address of a register, starting from @addr.
> + * coresight_timeout - loop until a bit has changed to a specific register
> + *			state.
> + * @csa: coresight device access for the device
> + * @offset: Offset of the register from the base of the device.
>   * @position: the position of the bit of interest.
>   * @value: the value the bit should have.
>   *
>   * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
>   * TIMEOUT_US has elapsed, which ever happens first.
>   */
> -
> -int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
> +int coresight_timeout(struct csdev_access *csa,
> +		      u32 offset,
> +		      int position,
> +		      int value)
>  {
>  	int i;
>  	u32 val;
>  
>  	for (i = TIMEOUT_US; i > 0; i--) {
> -		val = __raw_readl(addr + offset);
> +		val = csdev_access_read32(csa, offset);

Here we are moving to a memory barrier access, which is probably not a bad
thing.

>  		/* waiting on the bit to go from 0 to 1 */
>  		if (value) {
>  			if (val & BIT(position))
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 81ac708689f8..2989306f6041 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -433,8 +433,10 @@ coresight_register(struct coresight_desc *desc);
>  extern void coresight_unregister(struct coresight_device *csdev);
>  extern int coresight_enable(struct coresight_device *csdev);
>  extern void coresight_disable(struct coresight_device *csdev);
> -extern int coresight_timeout(void __iomem *addr, u32 offset,
> -			     int position, int value);
> +extern int coresight_timeout(struct csdev_access *csa,
> +			     u32 offset,
> +			     int position,
> +			     int value);
>  
>  extern int coresight_claim_device(void __iomem *base);
>  extern int coresight_claim_device_unlocked(void __iomem *base);
> @@ -460,8 +462,15 @@ static inline void coresight_unregister(struct coresight_device *csdev) {}
>  static inline int
>  coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
>  static inline void coresight_disable(struct coresight_device *csdev) {}
> -static inline int coresight_timeout(void __iomem *addr, u32 offset,
> -				     int position, int value) { return 1; }
> +
> +static inline int coresight_timeout(struct csdev_access *csa,
> +				    u32 offset,
> +				    int position,
> +				    int value)
> +{
> +	return 1;
> +}

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>

> +
>  static inline int coresight_claim_device_unlocked(void __iomem *base)
>  {
>  	return -EINVAL;
> -- 
> 2.24.1
> 

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[RFC PATCH 06/14] coresight: Convert claim and lock operations to use access wrappers

[Suzuki K Poulose]

Convert the CoreSight CLAIM set/clear, LOCK/UNLOCK operations to
use the coresight device access abstraction.

Mostly a mechanical change.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-catu.c  | 14 ++--
 .../hwtracing/coresight/coresight-cpu-debug.c | 26 ++++++--
 .../hwtracing/coresight/coresight-cti-sysfs.c |  4 +-
 drivers/hwtracing/coresight/coresight-cti.c   | 30 +++++----
 drivers/hwtracing/coresight/coresight-etb10.c | 20 +++---
 .../coresight/coresight-etm3x-sysfs.c         |  8 +--
 drivers/hwtracing/coresight/coresight-etm3x.c | 44 ++++++++-----
 drivers/hwtracing/coresight/coresight-etm4x.c | 44 ++++++++-----
 .../hwtracing/coresight/coresight-funnel.c    | 18 ++---
 drivers/hwtracing/coresight/coresight-priv.h  |  9 +--
 .../coresight/coresight-replicator.c          | 27 +++++---
 drivers/hwtracing/coresight/coresight-stm.c   | 46 ++++++++-----
 .../hwtracing/coresight/coresight-tmc-etf.c   | 36 ++++++----
 .../hwtracing/coresight/coresight-tmc-etr.c   | 19 +++---
 drivers/hwtracing/coresight/coresight-tpiu.c  |  9 +--
 drivers/hwtracing/coresight/coresight.c       | 66 +++++++++++--------
 include/linux/coresight.h                     | 16 ++---
 17 files changed, 266 insertions(+), 170 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 30f037d4549d..2918d0a4fe2e 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -411,6 +411,7 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, void *data)
 	u32 control, mode;
 	struct etr_buf *etr_buf = data;
 	struct device *dev = &drvdata->csdev->dev;
+	struct coresight_device *csdev = drvdata->csdev;
 
 	if (catu_wait_for_ready(drvdata))
 		dev_warn(dev, "Timeout while waiting for READY\n");
@@ -421,7 +422,7 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, void *data)
 		return -EBUSY;
 	}
 
-	rc = coresight_claim_device_unlocked(drvdata->base);
+	rc = coresight_claim_device_unlocked(csdev);
 	if (rc)
 		return rc;
 
@@ -455,9 +456,9 @@ static int catu_enable(struct coresight_device *csdev, void *data)
 	int rc;
 	struct catu_drvdata *catu_drvdata = csdev_to_catu_drvdata(csdev);
 
-	CS_UNLOCK(catu_drvdata->base);
+	CS_UNLOCK(&csdev->access);
 	rc = catu_enable_hw(catu_drvdata, data);
-	CS_LOCK(catu_drvdata->base);
+	CS_LOCK(&csdev->access);
 	return rc;
 }
 
@@ -465,9 +466,10 @@ static int catu_disable_hw(struct catu_drvdata *drvdata)
 {
 	int rc = 0;
 	struct device *dev = &drvdata->csdev->dev;
+	struct coresight_device *csdev = drvdata->csdev;
 
 	catu_write_control(drvdata, 0);
-	coresight_disclaim_device_unlocked(drvdata->base);
+	coresight_disclaim_device_unlocked(csdev);
 	if (catu_wait_for_ready(drvdata)) {
 		dev_info(dev, "Timeout while waiting for READY\n");
 		rc = -EAGAIN;
@@ -482,9 +484,9 @@ static int catu_disable(struct coresight_device *csdev, void *__unused)
 	int rc;
 	struct catu_drvdata *catu_drvdata = csdev_to_catu_drvdata(csdev);
 
-	CS_UNLOCK(catu_drvdata->base);
+	CS_UNLOCK(&csdev->access);
 	rc = catu_disable_hw(catu_drvdata);
-	CS_LOCK(catu_drvdata->base);
+	CS_LOCK(&csdev->access);
 	return rc;
 }
 
diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c
index 96544b348c27..efbf98c1056b 100644
--- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
+++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c
@@ -108,6 +108,24 @@ static bool debug_enable;
 module_param_named(enable, debug_enable, bool, 0600);
 MODULE_PARM_DESC(enable, "Control to enable coresight CPU debug functionality");
 
+static inline void debug_lock(struct debug_drvdata *drvdata)
+{
+	struct csdev_acces dummy = {
+		.base	= drvdata->base,
+	};
+
+	CS_LOCK(&dummy);
+}
+
+static void debug_unlock(struct debug_drvdata *drvdata)
+{
+	struct csdev_acces dummy = {
+		.base	= drvdata->base,
+	};
+
+	CS_UNLOCK(&dummy);
+}
+
 static void debug_os_unlock(struct debug_drvdata *drvdata)
 {
 	/* Unlocks the debug registers */
@@ -191,7 +209,7 @@ static void debug_read_regs(struct debug_drvdata *drvdata)
 {
 	u32 save_edprcr;
 
-	CS_UNLOCK(drvdata->base);
+	debug_unlock(drvdata);
 
 	/* Unlock os lock */
 	debug_os_unlock(drvdata);
@@ -238,7 +256,7 @@ static void debug_read_regs(struct debug_drvdata *drvdata)
 	/* Restore EDPRCR register */
 	writel_relaxed(save_edprcr, drvdata->base + EDPRCR);
 
-	CS_LOCK(drvdata->base);
+	debug_lock(drvdata);
 }
 
 #ifdef CONFIG_64BIT
@@ -326,13 +344,13 @@ static void debug_init_arch_data(void *info)
 	u32 mode, pcsr_offset;
 	u32 eddevid, eddevid1;
 
-	CS_UNLOCK(drvdata->base);
+	debug_unlock(drvdata);
 
 	/* Read device info */
 	eddevid  = readl_relaxed(drvdata->base + EDDEVID);
 	eddevid1 = readl_relaxed(drvdata->base + EDDEVID1);
 
-	CS_LOCK(drvdata->base);
+	debug_lock(drvdata);
 
 	/* Parse implementation feature */
 	mode = eddevid & EDDEVID_PCSAMPLE_MODE;
diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
index 392757f3a019..5897ede39222 100644
--- a/drivers/hwtracing/coresight/coresight-cti-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
@@ -223,11 +223,11 @@ static ssize_t cti_reg32_show(struct device *dev, char *buf,
 
 	spin_lock(&drvdata->spinlock);
 	if ((reg_offset >= 0) && cti_active(config)) {
-		CS_UNLOCK(drvdata->base);
+		CS_UNLOCK(&drvdata->csdev->access);
 		val = readl_relaxed(drvdata->base + reg_offset);
 		if (pcached_val)
 			*pcached_val = val;
-		CS_LOCK(drvdata->base);
+		CS_LOCK(&drvdata->csdev->access);
 	} else if (pcached_val) {
 		val = *pcached_val;
 	}
diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c
index c810ea3ba155..bdc75aa7d71c 100644
--- a/drivers/hwtracing/coresight/coresight-cti.c
+++ b/drivers/hwtracing/coresight/coresight-cti.c
@@ -60,10 +60,11 @@ DEFINE_CORESIGHT_DEVLIST(cti_sys_devs, "cti_sys");
 /* write set of regs to hardware - call with spinlock claimed */
 void cti_write_all_hw_regs(struct cti_drvdata *drvdata)
 {
+	struct coresight_device *csdev = drvdata->csdev;
 	struct cti_config *config = &drvdata->config;
 	int i;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	/* disable CTI before writing registers */
 	writel_relaxed(0, drvdata->base + CTICONTROL);
@@ -83,7 +84,7 @@ void cti_write_all_hw_regs(struct cti_drvdata *drvdata)
 	/* re-enable CTI */
 	writel_relaxed(1, drvdata->base + CTICONTROL);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static void cti_enable_hw_smp_call(void *info)
@@ -108,7 +109,7 @@ static int cti_enable_hw(struct cti_drvdata *drvdata)
 		goto cti_state_unchanged;
 
 	/* claim the device */
-	rc = coresight_claim_device(drvdata->base);
+	rc = coresight_claim_device(drvdata->csdev);
 	if (rc)
 		goto cti_err_not_enabled;
 
@@ -152,7 +153,7 @@ static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata)
 		goto cti_hp_not_enabled;
 
 	/* try to claim the device */
-	if (coresight_claim_device(drvdata->base))
+	if (coresight_claim_device(drvdata->csdev))
 		goto cti_hp_not_enabled;
 
 	cti_write_all_hw_regs(drvdata);
@@ -171,6 +172,7 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
 {
 	struct cti_config *config = &drvdata->config;
 	struct device *dev = &drvdata->csdev->dev;
+	struct coresight_device *csdev = drvdata->csdev;
 
 	spin_lock(&drvdata->spinlock);
 
@@ -182,14 +184,14 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
 	if (!config->hw_enabled || !config->hw_powered)
 		goto cti_not_disabled;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	/* disable CTI */
 	writel_relaxed(0, drvdata->base + CTICONTROL);
 	config->hw_enabled = false;
 
-	coresight_disclaim_device_unlocked(drvdata->base);
-	CS_LOCK(drvdata->base);
+	coresight_disclaim_device_unlocked(csdev);
+	CS_LOCK(&csdev->access);
 	spin_unlock(&drvdata->spinlock);
 	pm_runtime_put(dev);
 	return 0;
@@ -202,9 +204,9 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
 
 void cti_write_single_reg(struct cti_drvdata *drvdata, int offset, u32 value)
 {
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&drvdata->csdev->access);
 	writel_relaxed(value, drvdata->base + offset);
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&drvdata->csdev->access);
 }
 
 void cti_write_intack(struct device *dev, u32 ackval)
@@ -662,6 +664,7 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
 			     void *v)
 {
 	struct cti_drvdata *drvdata;
+	struct coresight_device *csdev;
 	unsigned int cpu = smp_processor_id();
 	int notify_res = NOTIFY_OK;
 
@@ -669,6 +672,7 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
 		return NOTIFY_OK;
 
 	drvdata = cti_cpu_drvdata[cpu];
+	csdev = drvdata->csdev;
 
 	if (WARN_ON_ONCE(drvdata->ctidev.cpu != cpu))
 		return NOTIFY_BAD;
@@ -680,13 +684,13 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
 		/* CTI regs all static - we have a copy & nothing to save */
 		drvdata->config.hw_powered = false;
 		if (drvdata->config.hw_enabled)
-			coresight_disclaim_device(drvdata->base);
+			coresight_disclaim_device(csdev);
 		break;
 
 	case CPU_PM_ENTER_FAILED:
 		drvdata->config.hw_powered = true;
 		if (drvdata->config.hw_enabled) {
-			if (coresight_claim_device(drvdata->base))
+			if (coresight_claim_device(csdev))
 				drvdata->config.hw_enabled = false;
 		}
 		break;
@@ -699,7 +703,7 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
 		/* check enable reference count to enable HW */
 		if (atomic_read(&drvdata->config.enable_req_count)) {
 			/* check we can claim the device as we re-power */
-			if (coresight_claim_device(drvdata->base))
+			if (coresight_claim_device(csdev))
 				goto cti_notify_exit;
 
 			drvdata->config.hw_enabled = true;
@@ -742,7 +746,7 @@ static int cti_dying_cpu(unsigned int cpu)
 
 	spin_lock(&drvdata->spinlock);
 	drvdata->config.hw_powered = false;
-	coresight_disclaim_device(drvdata->base);
+	coresight_disclaim_device(drvdata->csdev);
 	spin_unlock(&drvdata->spinlock);
 	return 0;
 }
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 507f63c51be5..e375b3ee0bb5 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -107,7 +107,7 @@ static void __etb_enable_hw(struct etb_drvdata *drvdata)
 	int i;
 	u32 depth;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&drvdata->csdev->access);
 
 	depth = drvdata->buffer_depth;
 	/* reset write RAM pointer address */
@@ -127,12 +127,12 @@ static void __etb_enable_hw(struct etb_drvdata *drvdata)
 	/* ETB trace capture enable */
 	writel_relaxed(ETB_CTL_CAPT_EN, drvdata->base + ETB_CTL_REG);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&drvdata->csdev->access);
 }
 
 static int etb_enable_hw(struct etb_drvdata *drvdata)
 {
-	int rc = coresight_claim_device(drvdata->base);
+	int rc = coresight_claim_device(drvdata->csdev);
 
 	if (rc)
 		return rc;
@@ -253,7 +253,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
 	struct device *dev = &drvdata->csdev->dev;
 	struct coresight_device *csdev = drvdata->csdev;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	ffcr = readl_relaxed(drvdata->base + ETB_FFCR);
 	/* stop formatter when a stop has completed */
@@ -276,7 +276,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
 			"timeout while waiting for Formatter to Stop\n");
 	}
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static void etb_dump_hw(struct etb_drvdata *drvdata)
@@ -289,7 +289,7 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
 	u32 frame_off, frame_endoff;
 	struct device *dev = &drvdata->csdev->dev;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&drvdata->csdev->access);
 
 	read_ptr = readl_relaxed(drvdata->base + ETB_RAM_READ_POINTER);
 	write_ptr = readl_relaxed(drvdata->base + ETB_RAM_WRITE_POINTER);
@@ -337,14 +337,14 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
 
 	writel_relaxed(read_ptr, drvdata->base + ETB_RAM_READ_POINTER);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&drvdata->csdev->access);
 }
 
 static void etb_disable_hw(struct etb_drvdata *drvdata)
 {
 	__etb_disable_hw(drvdata);
 	etb_dump_hw(drvdata);
-	coresight_disclaim_device(drvdata->base);
+	coresight_disclaim_device(drvdata->csdev);
 }
 
 static int etb_disable(struct coresight_device *csdev)
@@ -448,7 +448,7 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
 		goto out;
 
 	__etb_disable_hw(drvdata);
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&drvdata->csdev->access);
 
 	/* unit is in words, not bytes */
 	read_ptr = readl_relaxed(drvdata->base + ETB_RAM_READ_POINTER);
@@ -563,7 +563,7 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
 		handle->head += to_read;
 
 	__etb_enable_hw(drvdata);
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&drvdata->csdev->access);
 out:
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
diff --git a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
index e8c7649f123e..362f5da90523 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
@@ -50,11 +50,11 @@ static ssize_t etmsr_show(struct device *dev,
 
 	pm_runtime_get_sync(dev->parent);
 	spin_lock_irqsave(&drvdata->spinlock, flags);
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&drvdata->csdev->access);
 
 	val = etm_readl(drvdata, ETMSR);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&drvdata->csdev->access);
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 	pm_runtime_put(dev->parent);
 
@@ -948,9 +948,9 @@ static ssize_t seq_curr_state_show(struct device *dev,
 	pm_runtime_get_sync(dev->parent);
 	spin_lock_irqsave(&drvdata->spinlock, flags);
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&drvdata->csdev->access);
 	val = (etm_readl(drvdata, ETMSQR) & ETM_SQR_MASK);
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&drvdata->csdev->access);
 
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 	pm_runtime_put(dev->parent);
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index 7ddcb7fcb2d6..d6df7bc97531 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -360,10 +360,11 @@ static int etm_enable_hw(struct etm_drvdata *drvdata)
 	int i, rc;
 	u32 etmcr;
 	struct etm_config *config = &drvdata->config;
+	struct coresight_device *csdev = drvdata->csdev;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
-	rc = coresight_claim_device_unlocked(drvdata->base);
+	rc = coresight_claim_device_unlocked(csdev);
 	if (rc)
 		goto done;
 
@@ -423,9 +424,9 @@ static int etm_enable_hw(struct etm_drvdata *drvdata)
 	etm_clr_prog(drvdata);
 
 done:
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 
-	dev_dbg(&drvdata->csdev->dev, "cpu: %d enable smp call done: %d\n",
+	dev_dbg(&csdev->dev, "cpu: %d enable smp call done: %d\n",
 		drvdata->cpu, rc);
 	return rc;
 }
@@ -468,9 +469,9 @@ int etm_get_trace_id(struct etm_drvdata *drvdata)
 
 	spin_lock_irqsave(&drvdata->spinlock, flags);
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&drvdata->csdev->access);
 	trace_id = (etm_readl(drvdata, ETMTRACEIDR) & ETM_TRACEID_MASK);
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&drvdata->csdev->access);
 
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 	pm_runtime_put(etm_dev);
@@ -568,8 +569,9 @@ static void etm_disable_hw(void *info)
 	int i;
 	struct etm_drvdata *drvdata = info;
 	struct etm_config *config = &drvdata->config;
+	struct coresight_device *csdev = drvdata->csdev;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 	etm_set_prog(drvdata);
 
 	/* Read back sequencer and counters for post trace analysis */
@@ -579,22 +581,23 @@ static void etm_disable_hw(void *info)
 		config->cntr_val[i] = etm_readl(drvdata, ETMCNTVRn(i));
 
 	etm_set_pwrdwn(drvdata);
-	coresight_disclaim_device_unlocked(drvdata->base);
+	coresight_disclaim_device_unlocked(csdev);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 
-	dev_dbg(&drvdata->csdev->dev,
+	dev_dbg(&csdev->dev,
 		"cpu: %d disable smp call done\n", drvdata->cpu);
 }
 
 static void etm_disable_perf(struct coresight_device *csdev)
 {
 	struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+	struct coresight_device *csdev;
 
 	if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
 		return;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	/* Setting the prog bit disables tracing immediately */
 	etm_set_prog(drvdata);
@@ -604,9 +607,9 @@ static void etm_disable_perf(struct coresight_device *csdev)
 	 * power down the tracer.
 	 */
 	etm_set_pwrdwn(drvdata);
-	coresight_disclaim_device_unlocked(drvdata->base);
+	coresight_disclaim_device_unlocked(csdev);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static void etm_disable_sysfs(struct coresight_device *csdev)
@@ -732,16 +735,25 @@ static bool etm_arch_supported(u8 arch)
 	return true;
 }
 
+/*
+ * This function is called even before the csdev is registered.
+ * Thus we cant rely on drvdata->csdev to be valid.
+ */
 static void etm_init_arch_data(void *info)
 {
 	u32 etmidr;
 	u32 etmccr;
-	struct etm_drvdata *drvdata = info;
+	int cpu;
+	struct etm_drvdata *drvdata;
+	struct csdev_access *csa = info;
+
+	cpu = smp_processor_id();
+	drvdata = etmdrvdata[cpu];
 
 	/* Make sure all registers are accessible */
 	etm_os_unlock(drvdata);
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csa);
 
 	/* First dummy read */
 	(void)etm_readl(drvdata, ETMPDSR);
@@ -774,7 +786,7 @@ static void etm_init_arch_data(void *info)
 
 	etm_set_pwrdwn(drvdata);
 	etm_clr_pwrup(drvdata);
-	CS_LOCK(drvdata->base);
+	CS_LOCK(csa);
 }
 
 static void etm_init_trace_id(struct etm_drvdata *drvdata)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index d78d79940fc9..ce32d4ebc8b9 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -108,14 +108,15 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
 {
 	int i, rc;
 	struct etmv4_config *config = &drvdata->config;
-	struct device *etm_dev = &drvdata->csdev->dev;
 	struct coresight_device *csdev = drvdata->csdev;
+	struct device *etm_dev = &csdev->dev;
+	struct csdev_access *csa = &csdev->access;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(csa);
 
 	etm4_os_unlock(drvdata);
 
-	rc = coresight_claim_device_unlocked(drvdata->base);
+	rc = coresight_claim_device_unlocked(csdev);
 	if (rc)
 		goto done;
 
@@ -222,7 +223,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
 	isb();
 
 done:
-	CS_LOCK(drvdata->base);
+	CS_LOCK(csa);
 
 	dev_dbg(etm_dev, "cpu: %d enable smp call done: %d\n",
 		drvdata->cpu, rc);
@@ -478,7 +479,7 @@ static void etm4_disable_hw(void *info)
 	struct coresight_device *csdev = drvdata->csdev;
 	int i;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	if (!drvdata->skip_power_up) {
 		/* power can be removed from the trace unit now */
@@ -519,11 +520,11 @@ static void etm4_disable_hw(void *info)
 			readl_relaxed(drvdata->base + TRCCNTVRn(i));
 	}
 
-	coresight_disclaim_device_unlocked(drvdata->base);
+	coresight_disclaim_device_unlocked(csdev);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 
-	dev_dbg(&drvdata->csdev->dev,
+	dev_dbg(etm_dev,
 		"cpu: %d disable smp call done\n", drvdata->cpu);
 }
 
@@ -616,8 +617,12 @@ static const struct coresight_ops etm4_cs_ops = {
 	.source_ops	= &etm4_source_ops,
 };
 
-
-static void etm4_init_arch_data(void *__unused)
+/*
+ * This is called before coresight device is registered. Thus
+ * we must know the access method. drvdata is already available
+ * from per-cpu area.
+ */
+static void etm4_init_arch_data(void *info)
 {
 	u32 etmidr0;
 	u32 etmidr1;
@@ -625,6 +630,7 @@ static void etm4_init_arch_data(void *__unused)
 	u32 etmidr3;
 	u32 etmidr4;
 	u32 etmidr5;
+	struct csdev_access *csa = info;
 	struct etmv4_drvdata *drvdata;
 	int i, cpu;
 
@@ -637,7 +643,7 @@ static void etm4_init_arch_data(void *__unused)
 	/* Make sure all registers are accessible */
 	etm4_os_unlock(drvdata);
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(csa);
 
 	/* find all capabilities of the tracing unit */
 	etmidr0 = readl_relaxed(drvdata->base + TRCIDR0);
@@ -791,7 +797,7 @@ static void etm4_init_arch_data(void *__unused)
 	drvdata->nrseqstate = BMVAL(etmidr5, 25, 27);
 	/* NUMCNTR, bits[30:28] number of counters available for tracing */
 	drvdata->nr_cntr = BMVAL(etmidr5, 28, 30);
-	CS_LOCK(drvdata->base);
+	CS_LOCK(csa);
 }
 
 static void etm4_set_default_config(struct etmv4_config *config)
@@ -1146,11 +1152,13 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 	struct etmv4_save_state *state;
 	struct coresight_device *csdev = drvdata->csdev;
 	struct device *etm_dev;
+	struct csdev_access *csa;
 
 	if (WARN_ON(!csdev))
 		return -ENODEV;
 
 	etm_dev = &csdev->dev;
+	csa = &csdev->access;
 
 	/*
 	 * As recommended by 3.4.1 ("The procedure when powering down the PE")
@@ -1159,7 +1167,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 	dsb(sy);
 	isb();
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(csa);
 
 	/* Lock the OS lock to disable trace and external debugger access */
 	etm4_os_lock(drvdata);
@@ -1268,7 +1276,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 			drvdata->base + TRCPDCR);
 
 out:
-	CS_LOCK(drvdata->base);
+	CS_LOCK(csa);
 	return ret;
 }
 
@@ -1277,11 +1285,13 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
 	int i;
 	struct etmv4_save_state *state = drvdata->save_state;
 	struct coresight_device *csdev = drvdata->csdev;
+	struct csdev_access *csa;
 
 	if (WARN_ON(!csdev))
 		return;
 
-	CS_UNLOCK(drvdata->base);
+	csa = &csdev->access;
+	CS_UNLOCK(csa);
 
 	writel_relaxed(state->trcclaimset, drvdata->base + TRCCLAIMSET);
 
@@ -1373,7 +1383,7 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
 
 	/* Unlock the OS lock to re-enable trace and external debug access */
 	etm4_os_unlock(drvdata);
-	CS_LOCK(drvdata->base);
+	CS_LOCK(csa);
 }
 
 static int etm4_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
@@ -1526,7 +1536,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	etmdrvdata[drvdata->cpu] = drvdata;
 
 	if (smp_call_function_single(drvdata->cpu,
-				etm4_init_arch_data,  NULL, 1))
+				etm4_init_arch_data,  &desc.access, 1))
 		dev_err(dev, "ETM arch init failed\n");
 
 	ret = etm4_pm_setup_cpuslocked();
diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index 67fc3e3b77d8..d61ffbfe0a5c 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -52,13 +52,14 @@ static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
 {
 	u32 functl;
 	int rc = 0;
+	struct coresight_device *csdev = drvdata->csdev;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 	/* Claim the device only when we enable the first slave */
 	if (!(functl & FUNNEL_ENSx_MASK)) {
-		rc = coresight_claim_device_unlocked(drvdata->base);
+		rc = coresight_claim_device_unlocked(csdev);
 		if (rc)
 			goto done;
 	}
@@ -69,7 +70,7 @@ static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
 	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
 	writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
 done:
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 	return rc;
 }
 
@@ -101,8 +102,9 @@ static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
 				      int inport)
 {
 	u32 functl;
+	struct coresight_device *csdev = drvdata->csdev;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 	functl &= ~(1 << inport);
@@ -110,9 +112,9 @@ static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
 
 	/* Disclaim the device if none of the slaves are now active */
 	if (!(functl & FUNNEL_ENSx_MASK))
-		coresight_disclaim_device_unlocked(drvdata->base);
+		coresight_disclaim_device_unlocked(csdev);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static void funnel_disable(struct coresight_device *csdev, int inport,
@@ -173,9 +175,9 @@ static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
 {
 	u32 functl;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&drvdata->csdev->access);
 	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&drvdata->csdev->access);
 
 	return functl;
 }
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index f2dc625ea585..a87ce11a0ea6 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -108,19 +108,20 @@ static inline void coresight_insert_barrier_packet(void *buf)
 }
 
 
-static inline void CS_LOCK(void __iomem *addr)
+static inline void CS_LOCK(struct csdev_access *csa)
 {
 	do {
 		/* Wait for things to settle */
 		mb();
-		writel_relaxed(0x0, addr + CORESIGHT_LAR);
+		csdev_access_relaxed_write32(csa, 0x0, CORESIGHT_LAR);
 	} while (0);
 }
 
-static inline void CS_UNLOCK(void __iomem *addr)
+static inline void CS_UNLOCK(struct csdev_access *csa)
 {
 	do {
-		writel_relaxed(CORESIGHT_UNLOCK, addr + CORESIGHT_LAR);
+		csdev_access_relaxed_write32(csa, CORESIGHT_UNLOCK,
+					  CORESIGHT_LAR);
 		/* Make sure everyone has seen this */
 		mb();
 	} while (0);
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index 65704ada20a5..4c04d819b1a6 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -45,15 +45,20 @@ struct replicator_drvdata {
 
 static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
 
-	if (!coresight_claim_device_unlocked(drvdata->base)) {
+	if (WARN_ON(!csdev))
+		return;
+
+	CS_UNLOCK(&csdev->access);
+
+	if (!coresight_claim_device_unlocked(csdev)) {
 		writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
 		writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
-		coresight_disclaim_device_unlocked(drvdata->base);
+		coresight_disclaim_device_unlocked(csdev);
 	}
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 /*
@@ -70,8 +75,9 @@ static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
 {
 	int rc = 0;
 	u32 id0val, id1val;
+	struct coresight_device *csdev = drvdata->csdev;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	id0val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0);
 	id1val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1);
@@ -84,7 +90,7 @@ static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
 		id0val = id1val = 0xff;
 
 	if (id0val == 0xff && id1val == 0xff)
-		rc = coresight_claim_device_unlocked(drvdata->base);
+		rc = coresight_claim_device_unlocked(csdev);
 
 	if (!rc) {
 		switch (outport) {
@@ -106,7 +112,7 @@ static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
 		writel_relaxed(id1val, drvdata->base + REPLICATOR_IDFILTER1);
 	}
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 
 	return rc;
 }
@@ -140,6 +146,7 @@ static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
 				       int inport, int outport)
 {
 	u32 reg;
+	struct coresight_device *csdev = drvdata->csdev;
 
 	switch (outport) {
 	case 0:
@@ -153,15 +160,15 @@ static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
 		return;
 	}
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	/* disable the flow of ATB data through port */
 	writel_relaxed(0xff, drvdata->base + reg);
 
 	if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
 	    (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
-		coresight_disclaim_device_unlocked(drvdata->base);
-	CS_LOCK(drvdata->base);
+		coresight_disclaim_device_unlocked(csdev);
+	CS_LOCK(&csdev->access);
 }
 
 static void replicator_disable(struct coresight_device *csdev, int inport,
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index b704000c96b8..112221dd6dd3 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -148,7 +148,9 @@ struct stm_drvdata {
 
 static void stm_hwevent_enable_hw(struct stm_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(&csdev->access);
 
 	writel_relaxed(drvdata->stmhebsr, drvdata->base + STMHEBSR);
 	writel_relaxed(drvdata->stmheter, drvdata->base + STMHETER);
@@ -157,29 +159,33 @@ static void stm_hwevent_enable_hw(struct stm_drvdata *drvdata)
 		       0x04,	/* Error detection on event tracing */
 		       drvdata->base + STMHEMCR);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static void stm_port_enable_hw(struct stm_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(&csdev->access);
 	/* ATB trigger enable on direct writes to TRIG locations */
 	writel_relaxed(0x10,
 		       drvdata->base + STMSPTRIGCSR);
 	writel_relaxed(drvdata->stmspscr, drvdata->base + STMSPSCR);
 	writel_relaxed(drvdata->stmsper, drvdata->base + STMSPER);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static void stm_enable_hw(struct stm_drvdata *drvdata)
 {
+	struct coresight_device *csdev = drvdata->csdev;
+
 	if (drvdata->stmheer)
 		stm_hwevent_enable_hw(drvdata);
 
 	stm_port_enable_hw(drvdata);
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	/* 4096 byte between synchronisation packets */
 	writel_relaxed(0xFFF, drvdata->base + STMSYNCR);
@@ -188,7 +194,7 @@ static void stm_enable_hw(struct stm_drvdata *drvdata)
 			0x01),			 /* global STM enable */
 			drvdata->base + STMTCSR);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static int stm_enable(struct coresight_device *csdev,
@@ -218,36 +224,41 @@ static int stm_enable(struct coresight_device *csdev,
 
 static void stm_hwevent_disable_hw(struct stm_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(&csdev->access);
 
 	writel_relaxed(0x0, drvdata->base + STMHEMCR);
 	writel_relaxed(0x0, drvdata->base + STMHEER);
 	writel_relaxed(0x0, drvdata->base + STMHETER);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static void stm_port_disable_hw(struct stm_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(&csdev->access);
 
 	writel_relaxed(0x0, drvdata->base + STMSPER);
 	writel_relaxed(0x0, drvdata->base + STMSPTRIGCSR);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static void stm_disable_hw(struct stm_drvdata *drvdata)
 {
 	u32 val;
+	struct coresight_device *csdev = drvdata->csdev;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	val = readl_relaxed(drvdata->base + STMTCSR);
 	val &= ~0x1; /* clear global STM enable [0] */
 	writel_relaxed(val, drvdata->base + STMTCSR);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 
 	stm_port_disable_hw(drvdata);
 	if (drvdata->stmheer)
@@ -534,6 +545,8 @@ static ssize_t port_select_store(struct device *dev,
 				 const char *buf, size_t size)
 {
 	struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+	struct coresight_device *csdev = drvdata->csdev;
+
 	unsigned long val, stmsper;
 	int ret = 0;
 
@@ -545,13 +558,13 @@ static ssize_t port_select_store(struct device *dev,
 	drvdata->stmspscr = val;
 
 	if (local_read(&drvdata->mode)) {
-		CS_UNLOCK(drvdata->base);
+		CS_UNLOCK(&csdev->access);
 		/* Process as per ARM's TRM recommendation */
 		stmsper = readl_relaxed(drvdata->base + STMSPER);
 		writel_relaxed(0x0, drvdata->base + STMSPER);
 		writel_relaxed(drvdata->stmspscr, drvdata->base + STMSPSCR);
 		writel_relaxed(stmsper, drvdata->base + STMSPER);
-		CS_LOCK(drvdata->base);
+		CS_LOCK(&csdev->access);
 	}
 	spin_unlock(&drvdata->spinlock);
 
@@ -581,6 +594,7 @@ static ssize_t port_enable_store(struct device *dev,
 				 const char *buf, size_t size)
 {
 	struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+	struct coresight_device *csdev = drvdata->csdev;
 	unsigned long val;
 	int ret = 0;
 
@@ -592,9 +606,9 @@ static ssize_t port_enable_store(struct device *dev,
 	drvdata->stmsper = val;
 
 	if (local_read(&drvdata->mode)) {
-		CS_UNLOCK(drvdata->base);
+		CS_UNLOCK(&csdev->access);
 		writel_relaxed(drvdata->stmsper, drvdata->base + STMSPER);
-		CS_LOCK(drvdata->base);
+		CS_LOCK(&csdev->access);
 	}
 	spin_unlock(&drvdata->spinlock);
 
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 6375504ba8b0..00c82a6f5f4a 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -18,7 +18,9 @@ static int tmc_set_etf_buffer(struct coresight_device *csdev,
 
 static void __tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(&csdev->access);
 
 	/* Wait for TMCSReady bit to be set */
 	tmc_wait_for_tmcready(drvdata);
@@ -32,12 +34,12 @@ static void __tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
 	writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
 	tmc_enable_hw(drvdata);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static int tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
 {
-	int rc = coresight_claim_device(drvdata->base);
+	int rc = coresight_claim_device(drvdata->csdev);
 
 	if (rc)
 		return rc;
@@ -71,7 +73,9 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
 
 static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(&csdev->access);
 
 	tmc_flush_and_stop(drvdata);
 	/*
@@ -82,18 +86,20 @@ static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
 		tmc_etb_dump_hw(drvdata);
 	tmc_disable_hw(drvdata);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
 {
 	__tmc_etb_disable_hw(drvdata);
-	coresight_disclaim_device(drvdata->base);
+	coresight_disclaim_device(drvdata->csdev);
 }
 
 static void __tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(&csdev->access);
 
 	/* Wait for TMCSReady bit to be set */
 	tmc_wait_for_tmcready(drvdata);
@@ -104,12 +110,12 @@ static void __tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
 	writel_relaxed(0x0, drvdata->base + TMC_BUFWM);
 	tmc_enable_hw(drvdata);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static int tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
 {
-	int rc = coresight_claim_device(drvdata->base);
+	int rc = coresight_claim_device(drvdata->csdev);
 
 	if (rc)
 		return rc;
@@ -120,12 +126,14 @@ static int tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
 
 static void tmc_etf_disable_hw(struct tmc_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(&csdev->access);
 
 	tmc_flush_and_stop(drvdata);
 	tmc_disable_hw(drvdata);
-	coresight_disclaim_device_unlocked(drvdata->base);
-	CS_LOCK(drvdata->base);
+	coresight_disclaim_device_unlocked(csdev);
+	CS_LOCK(&csdev->access);
 }
 
 /*
@@ -464,7 +472,7 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
 	if (atomic_read(csdev->refcnt) != 1)
 		goto out;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	tmc_flush_and_stop(drvdata);
 
@@ -549,7 +557,7 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
 	if (buf->snapshot)
 		handle->head += to_read;
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 out:
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index b29c2db94d96..a9ce3be44e2c 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -952,8 +952,9 @@ static void __tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
 {
 	u32 axictl, sts;
 	struct etr_buf *etr_buf = drvdata->etr_buf;
+	struct coresight_device *csdev = drvdata->csdev;
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	/* Wait for TMCSReady bit to be set */
 	tmc_wait_for_tmcready(drvdata);
@@ -995,7 +996,7 @@ static void __tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
 	writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
 	tmc_enable_hw(drvdata);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 }
 
 static int tmc_etr_enable_hw(struct tmc_drvdata *drvdata,
@@ -1021,7 +1022,7 @@ static int tmc_etr_enable_hw(struct tmc_drvdata *drvdata,
 	rc = tmc_etr_enable_catu(drvdata, etr_buf);
 	if (rc)
 		return rc;
-	rc = coresight_claim_device(drvdata->base);
+	rc = coresight_claim_device(drvdata->csdev);
 	if (!rc) {
 		drvdata->etr_buf = etr_buf;
 		__tmc_etr_enable_hw(drvdata);
@@ -1094,7 +1095,9 @@ static void tmc_etr_sync_sysfs_buf(struct tmc_drvdata *drvdata)
 
 static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
 {
-	CS_UNLOCK(drvdata->base);
+	struct coresight_device *csdev = drvdata->csdev;
+
+	CS_UNLOCK(&csdev->access);
 
 	tmc_flush_and_stop(drvdata);
 	/*
@@ -1106,7 +1109,7 @@ static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
 
 	tmc_disable_hw(drvdata);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 
 }
 
@@ -1115,7 +1118,7 @@ void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
 	__tmc_etr_disable_hw(drvdata);
 	/* Disable CATU device if this ETR is connected to one */
 	tmc_etr_disable_catu(drvdata);
-	coresight_disclaim_device(drvdata->base);
+	coresight_disclaim_device(drvdata->csdev);
 	/* Reset the ETR buf used by hardware */
 	drvdata->etr_buf = NULL;
 }
@@ -1497,12 +1500,12 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
 		goto out;
 	}
 
-	CS_UNLOCK(drvdata->base);
+	CS_UNLOCK(&csdev->access);
 
 	tmc_flush_and_stop(drvdata);
 	tmc_sync_etr_buf(drvdata);
 
-	CS_LOCK(drvdata->base);
+	CS_LOCK(&csdev->access);
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
 	lost = etr_buf->full;
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index 282d80e97265..8586c015d37a 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -62,11 +62,11 @@ struct tpiu_drvdata {
 
 static void tpiu_enable_hw(struct csdev_access *csa)
 {
-	CS_UNLOCK(csa->base);
+	CS_UNLOCK(csa);
 
 	/* TODO: fill this up */
 
-	CS_LOCK(csa->base);
+	CS_LOCK(csa);
 }
 
 static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused)
@@ -79,7 +79,8 @@ static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused)
 
 static void tpiu_disable_hw(struct csdev_access *csa)
 {
-	CS_UNLOCK(csa->base);
+
+	CS_UNLOCK(csa);
 
 	/* Clear formatter and stop on flush */
 	csdev_access_relaxed_write32(csa, FFCR_STOP_FI, TPIU_FFCR);
@@ -90,7 +91,7 @@ static void tpiu_disable_hw(struct csdev_access *csa)
 	/* Wait for formatter to stop */
 	coresight_timeout(csa, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
 
-	CS_LOCK(csa->base);
+	CS_LOCK(csa);
 }
 
 static int tpiu_disable(struct coresight_device *csdev)
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 21e7615fcbc8..c1b4355d2211 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -130,30 +130,32 @@ static int coresight_find_link_outport(struct coresight_device *csdev,
 	return -ENODEV;
 }
 
-static inline u32 coresight_read_claim_tags(void __iomem *base)
+static inline u32 coresight_read_claim_tags(struct coresight_device *csdev)
 {
-	return readl_relaxed(base + CORESIGHT_CLAIMCLR);
+	return coresight_relaxed_read32(csdev, CORESIGHT_CLAIMCLR);
 }
 
-static inline bool coresight_is_claimed_self_hosted(void __iomem *base)
+static inline bool coresight_is_claimed_self_hosted(struct coresight_device *csdev)
 {
-	return coresight_read_claim_tags(base) == CORESIGHT_CLAIM_SELF_HOSTED;
+	return coresight_read_claim_tags(csdev) == CORESIGHT_CLAIM_SELF_HOSTED;
 }
 
-static inline bool coresight_is_claimed_any(void __iomem *base)
+static inline bool coresight_is_claimed_any(struct coresight_device *csdev)
 {
-	return coresight_read_claim_tags(base) != 0;
+	return coresight_read_claim_tags(csdev) != 0;
 }
 
-static inline void coresight_set_claim_tags(void __iomem *base)
+static inline void coresight_set_claim_tags(struct coresight_device *csdev)
 {
-	writel_relaxed(CORESIGHT_CLAIM_SELF_HOSTED, base + CORESIGHT_CLAIMSET);
+	coresight_relaxed_write32(csdev, CORESIGHT_CLAIM_SELF_HOSTED,
+				  CORESIGHT_CLAIMSET);
 	isb();
 }
 
-static inline void coresight_clear_claim_tags(void __iomem *base)
+static inline void coresight_clear_claim_tags(struct coresight_device *csdev)
 {
-	writel_relaxed(CORESIGHT_CLAIM_SELF_HOSTED, base + CORESIGHT_CLAIMCLR);
+	coresight_relaxed_write32(csdev, CORESIGHT_CLAIM_SELF_HOSTED,
+				  CORESIGHT_CLAIMCLR);
 	isb();
 }
 
@@ -167,26 +169,32 @@ static inline void coresight_clear_claim_tags(void __iomem *base)
  * Called with CS_UNLOCKed for the component.
  * Returns : 0 on success
  */
-int coresight_claim_device_unlocked(void __iomem *base)
+int coresight_claim_device_unlocked(struct coresight_device *csdev)
 {
-	if (coresight_is_claimed_any(base))
+	if (WARN_ON(!csdev))
+		return -EINVAL;
+
+	if (coresight_is_claimed_any(csdev))
 		return -EBUSY;
 
-	coresight_set_claim_tags(base);
-	if (coresight_is_claimed_self_hosted(base))
+	coresight_set_claim_tags(csdev);
+	if (coresight_is_claimed_self_hosted(csdev))
 		return 0;
 	/* There was a race setting the tags, clean up and fail */
-	coresight_clear_claim_tags(base);
+	coresight_clear_claim_tags(csdev);
 	return -EBUSY;
 }
 
-int coresight_claim_device(void __iomem *base)
+int coresight_claim_device(struct coresight_device *csdev)
 {
 	int rc;
 
-	CS_UNLOCK(base);
-	rc = coresight_claim_device_unlocked(base);
-	CS_LOCK(base);
+	if (WARN_ON(!csdev))
+		return -EINVAL;
+
+	CS_UNLOCK(&csdev->access);
+	rc = coresight_claim_device_unlocked(csdev);
+	CS_LOCK(&csdev->access);
 
 	return rc;
 }
@@ -195,11 +203,14 @@ int coresight_claim_device(void __iomem *base)
  * coresight_disclaim_device_unlocked : Clear the claim tags for the device.
  * Called with CS_UNLOCKed for the component.
  */
-void coresight_disclaim_device_unlocked(void __iomem *base)
+void coresight_disclaim_device_unlocked(struct coresight_device *csdev)
 {
 
-	if (coresight_is_claimed_self_hosted(base))
-		coresight_clear_claim_tags(base);
+	if (WARN_ON(!csdev))
+		return;
+
+	if (coresight_is_claimed_self_hosted(csdev))
+		coresight_clear_claim_tags(csdev);
 	else
 		/*
 		 * The external agent may have not honoured our claim
@@ -209,11 +220,14 @@ void coresight_disclaim_device_unlocked(void __iomem *base)
 		WARN_ON_ONCE(1);
 }
 
-void coresight_disclaim_device(void __iomem *base)
+void coresight_disclaim_device(struct coresight_device *csdev)
 {
-	CS_UNLOCK(base);
-	coresight_disclaim_device_unlocked(base);
-	CS_LOCK(base);
+	if (WARN_ON(!csdev))
+		return;
+
+	CS_UNLOCK(&csdev->access);
+	coresight_disclaim_device_unlocked(csdev);
+	CS_LOCK(&csdev->access);
 }
 
 /* enable or disable an associated CTI device of the supplied CS device */
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 2989306f6041..c0cccdc8f9be 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -438,11 +438,11 @@ extern int coresight_timeout(struct csdev_access *csa,
 			     int position,
 			     int value);
 
-extern int coresight_claim_device(void __iomem *base);
-extern int coresight_claim_device_unlocked(void __iomem *base);
+extern int coresight_claim_device(struct coresight_device *csdev);
+extern int coresight_claim_device_unlocked(struct coresight_device *csdev);
 
-extern void coresight_disclaim_device(void __iomem *base);
-extern void coresight_disclaim_device_unlocked(void __iomem *base);
+extern void coresight_disclaim_device(struct coresight_device *csdev);
+extern void coresight_disclaim_device_unlocked(struct coresight_device *csdev);
 extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
 					 struct device *dev);
 
@@ -471,18 +471,18 @@ static inline int coresight_timeout(struct csdev_access *csa,
 	return 1;
 }
 
-static inline int coresight_claim_device_unlocked(void __iomem *base)
+static inline int coresight_claim_device_unlocked(struct coresight_device *csdev)
 {
 	return -EINVAL;
 }
 
-static inline int coresight_claim_device(void __iomem *base)
+static inline int coresight_claim_device(struct coresight_device *csdev)
 {
 	return -EINVAL;
 }
 
-static inline void coresight_disclaim_device(void __iomem *base) {}
-static inline void coresight_disclaim_device_unlocked(void __iomem *base) {}
+static inline void coresight_disclaim_device(struct coresight_device *csdev) {}
+static inline void coresight_disclaim_device_unlocked(struct coresight_device *csdev) {}
 
 static inline bool coresight_loses_context_with_cpu(struct device *dev)
 {
-- 
2.24.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [RFC PATCH 06/14] coresight: Convert claim and lock operations to use access wrappers

[Mathieu Poirier]

On Wed, Jul 22, 2020 at 06:20:32PM +0100, Suzuki K Poulose wrote:
> Convert the CoreSight CLAIM set/clear, LOCK/UNLOCK operations to
> use the coresight device access abstraction.
> 
> Mostly a mechanical change.
> 
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-catu.c  | 14 ++--
>  .../hwtracing/coresight/coresight-cpu-debug.c | 26 ++++++--
>  .../hwtracing/coresight/coresight-cti-sysfs.c |  4 +-
>  drivers/hwtracing/coresight/coresight-cti.c   | 30 +++++----
>  drivers/hwtracing/coresight/coresight-etb10.c | 20 +++---
>  .../coresight/coresight-etm3x-sysfs.c         |  8 +--
>  drivers/hwtracing/coresight/coresight-etm3x.c | 44 ++++++++-----
>  drivers/hwtracing/coresight/coresight-etm4x.c | 44 ++++++++-----
>  .../hwtracing/coresight/coresight-funnel.c    | 18 ++---
>  drivers/hwtracing/coresight/coresight-priv.h  |  9 +--
>  .../coresight/coresight-replicator.c          | 27 +++++---
>  drivers/hwtracing/coresight/coresight-stm.c   | 46 ++++++++-----
>  .../hwtracing/coresight/coresight-tmc-etf.c   | 36 ++++++----
>  .../hwtracing/coresight/coresight-tmc-etr.c   | 19 +++---
>  drivers/hwtracing/coresight/coresight-tpiu.c  |  9 +--
>  drivers/hwtracing/coresight/coresight.c       | 66 +++++++++++--------
>  include/linux/coresight.h                     | 16 ++---
>  17 files changed, 266 insertions(+), 170 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
> index 30f037d4549d..2918d0a4fe2e 100644
> --- a/drivers/hwtracing/coresight/coresight-catu.c
> +++ b/drivers/hwtracing/coresight/coresight-catu.c
> @@ -411,6 +411,7 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, void *data)
>  	u32 control, mode;
>  	struct etr_buf *etr_buf = data;
>  	struct device *dev = &drvdata->csdev->dev;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
>  	if (catu_wait_for_ready(drvdata))
>  		dev_warn(dev, "Timeout while waiting for READY\n");
> @@ -421,7 +422,7 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, void *data)
>  		return -EBUSY;
>  	}
>  
> -	rc = coresight_claim_device_unlocked(drvdata->base);
> +	rc = coresight_claim_device_unlocked(csdev);
>  	if (rc)
>  		return rc;
>  
> @@ -455,9 +456,9 @@ static int catu_enable(struct coresight_device *csdev, void *data)
>  	int rc;
>  	struct catu_drvdata *catu_drvdata = csdev_to_catu_drvdata(csdev);
>  
> -	CS_UNLOCK(catu_drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  	rc = catu_enable_hw(catu_drvdata, data);
> -	CS_LOCK(catu_drvdata->base);
> +	CS_LOCK(&csdev->access);
>  	return rc;
>  }
>  
> @@ -465,9 +466,10 @@ static int catu_disable_hw(struct catu_drvdata *drvdata)
>  {
>  	int rc = 0;
>  	struct device *dev = &drvdata->csdev->dev;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
>  	catu_write_control(drvdata, 0);
> -	coresight_disclaim_device_unlocked(drvdata->base);
> +	coresight_disclaim_device_unlocked(csdev);
>  	if (catu_wait_for_ready(drvdata)) {
>  		dev_info(dev, "Timeout while waiting for READY\n");
>  		rc = -EAGAIN;
> @@ -482,9 +484,9 @@ static int catu_disable(struct coresight_device *csdev, void *__unused)
>  	int rc;
>  	struct catu_drvdata *catu_drvdata = csdev_to_catu_drvdata(csdev);
>  
> -	CS_UNLOCK(catu_drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  	rc = catu_disable_hw(catu_drvdata);
> -	CS_LOCK(catu_drvdata->base);
> +	CS_LOCK(&csdev->access);
>  	return rc;
>  }
>  
> diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> index 96544b348c27..efbf98c1056b 100644
> --- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
> +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> @@ -108,6 +108,24 @@ static bool debug_enable;
>  module_param_named(enable, debug_enable, bool, 0600);
>  MODULE_PARM_DESC(enable, "Control to enable coresight CPU debug functionality");
>  
> +static inline void debug_lock(struct debug_drvdata *drvdata)
> +{
> +	struct csdev_acces dummy = {
> +		.base	= drvdata->base,
> +	};
> +
> +	CS_LOCK(&dummy);
> +}
> +
> +static void debug_unlock(struct debug_drvdata *drvdata)
> +{
> +	struct csdev_acces dummy = {
> +		.base	= drvdata->base,
> +	};
> +
> +	CS_UNLOCK(&dummy);
> +}
> +
>  static void debug_os_unlock(struct debug_drvdata *drvdata)
>  {
>  	/* Unlocks the debug registers */
> @@ -191,7 +209,7 @@ static void debug_read_regs(struct debug_drvdata *drvdata)
>  {
>  	u32 save_edprcr;
>  
> -	CS_UNLOCK(drvdata->base);
> +	debug_unlock(drvdata);
>  
>  	/* Unlock os lock */
>  	debug_os_unlock(drvdata);
> @@ -238,7 +256,7 @@ static void debug_read_regs(struct debug_drvdata *drvdata)
>  	/* Restore EDPRCR register */
>  	writel_relaxed(save_edprcr, drvdata->base + EDPRCR);
>  
> -	CS_LOCK(drvdata->base);
> +	debug_lock(drvdata);
>  }
>  
>  #ifdef CONFIG_64BIT
> @@ -326,13 +344,13 @@ static void debug_init_arch_data(void *info)
>  	u32 mode, pcsr_offset;
>  	u32 eddevid, eddevid1;
>  
> -	CS_UNLOCK(drvdata->base);
> +	debug_unlock(drvdata);
>  
>  	/* Read device info */
>  	eddevid  = readl_relaxed(drvdata->base + EDDEVID);
>  	eddevid1 = readl_relaxed(drvdata->base + EDDEVID1);
>  
> -	CS_LOCK(drvdata->base);
> +	debug_lock(drvdata);
>  
>  	/* Parse implementation feature */
>  	mode = eddevid & EDDEVID_PCSAMPLE_MODE;
> diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> index 392757f3a019..5897ede39222 100644
> --- a/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> @@ -223,11 +223,11 @@ static ssize_t cti_reg32_show(struct device *dev, char *buf,
>  
>  	spin_lock(&drvdata->spinlock);
>  	if ((reg_offset >= 0) && cti_active(config)) {
> -		CS_UNLOCK(drvdata->base);
> +		CS_UNLOCK(&drvdata->csdev->access);
>  		val = readl_relaxed(drvdata->base + reg_offset);
>  		if (pcached_val)
>  			*pcached_val = val;
> -		CS_LOCK(drvdata->base);
> +		CS_LOCK(&drvdata->csdev->access);
>  	} else if (pcached_val) {
>  		val = *pcached_val;
>  	}
> diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c
> index c810ea3ba155..bdc75aa7d71c 100644
> --- a/drivers/hwtracing/coresight/coresight-cti.c
> +++ b/drivers/hwtracing/coresight/coresight-cti.c
> @@ -60,10 +60,11 @@ DEFINE_CORESIGHT_DEVLIST(cti_sys_devs, "cti_sys");
>  /* write set of regs to hardware - call with spinlock claimed */
>  void cti_write_all_hw_regs(struct cti_drvdata *drvdata)
>  {
> +	struct coresight_device *csdev = drvdata->csdev;
>  	struct cti_config *config = &drvdata->config;
>  	int i;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	/* disable CTI before writing registers */
>  	writel_relaxed(0, drvdata->base + CTICONTROL);
> @@ -83,7 +84,7 @@ void cti_write_all_hw_regs(struct cti_drvdata *drvdata)
>  	/* re-enable CTI */
>  	writel_relaxed(1, drvdata->base + CTICONTROL);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void cti_enable_hw_smp_call(void *info)
> @@ -108,7 +109,7 @@ static int cti_enable_hw(struct cti_drvdata *drvdata)
>  		goto cti_state_unchanged;
>  
>  	/* claim the device */
> -	rc = coresight_claim_device(drvdata->base);
> +	rc = coresight_claim_device(drvdata->csdev);
>  	if (rc)
>  		goto cti_err_not_enabled;
>  
> @@ -152,7 +153,7 @@ static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata)
>  		goto cti_hp_not_enabled;
>  
>  	/* try to claim the device */
> -	if (coresight_claim_device(drvdata->base))
> +	if (coresight_claim_device(drvdata->csdev))
>  		goto cti_hp_not_enabled;
>  
>  	cti_write_all_hw_regs(drvdata);
> @@ -171,6 +172,7 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
>  {
>  	struct cti_config *config = &drvdata->config;
>  	struct device *dev = &drvdata->csdev->dev;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
>  	spin_lock(&drvdata->spinlock);
>  
> @@ -182,14 +184,14 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
>  	if (!config->hw_enabled || !config->hw_powered)
>  		goto cti_not_disabled;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	/* disable CTI */
>  	writel_relaxed(0, drvdata->base + CTICONTROL);
>  	config->hw_enabled = false;
>  
> -	coresight_disclaim_device_unlocked(drvdata->base);
> -	CS_LOCK(drvdata->base);
> +	coresight_disclaim_device_unlocked(csdev);
> +	CS_LOCK(&csdev->access);
>  	spin_unlock(&drvdata->spinlock);
>  	pm_runtime_put(dev);
>  	return 0;
> @@ -202,9 +204,9 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
>  
>  void cti_write_single_reg(struct cti_drvdata *drvdata, int offset, u32 value)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&drvdata->csdev->access);
>  	writel_relaxed(value, drvdata->base + offset);
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&drvdata->csdev->access);
>  }
>  
>  void cti_write_intack(struct device *dev, u32 ackval)
> @@ -662,6 +664,7 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
>  			     void *v)
>  {
>  	struct cti_drvdata *drvdata;
> +	struct coresight_device *csdev;
>  	unsigned int cpu = smp_processor_id();
>  	int notify_res = NOTIFY_OK;
>  
> @@ -669,6 +672,7 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
>  		return NOTIFY_OK;
>  
>  	drvdata = cti_cpu_drvdata[cpu];
> +	csdev = drvdata->csdev;
>  
>  	if (WARN_ON_ONCE(drvdata->ctidev.cpu != cpu))
>  		return NOTIFY_BAD;
> @@ -680,13 +684,13 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
>  		/* CTI regs all static - we have a copy & nothing to save */
>  		drvdata->config.hw_powered = false;
>  		if (drvdata->config.hw_enabled)
> -			coresight_disclaim_device(drvdata->base);
> +			coresight_disclaim_device(csdev);
>  		break;
>  
>  	case CPU_PM_ENTER_FAILED:
>  		drvdata->config.hw_powered = true;
>  		if (drvdata->config.hw_enabled) {
> -			if (coresight_claim_device(drvdata->base))
> +			if (coresight_claim_device(csdev))
>  				drvdata->config.hw_enabled = false;
>  		}
>  		break;
> @@ -699,7 +703,7 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
>  		/* check enable reference count to enable HW */
>  		if (atomic_read(&drvdata->config.enable_req_count)) {
>  			/* check we can claim the device as we re-power */
> -			if (coresight_claim_device(drvdata->base))
> +			if (coresight_claim_device(csdev))
>  				goto cti_notify_exit;
>  
>  			drvdata->config.hw_enabled = true;
> @@ -742,7 +746,7 @@ static int cti_dying_cpu(unsigned int cpu)
>  
>  	spin_lock(&drvdata->spinlock);
>  	drvdata->config.hw_powered = false;
> -	coresight_disclaim_device(drvdata->base);
> +	coresight_disclaim_device(drvdata->csdev);
>  	spin_unlock(&drvdata->spinlock);
>  	return 0;
>  }
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index 507f63c51be5..e375b3ee0bb5 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -107,7 +107,7 @@ static void __etb_enable_hw(struct etb_drvdata *drvdata)
>  	int i;
>  	u32 depth;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&drvdata->csdev->access);
>  
>  	depth = drvdata->buffer_depth;
>  	/* reset write RAM pointer address */
> @@ -127,12 +127,12 @@ static void __etb_enable_hw(struct etb_drvdata *drvdata)
>  	/* ETB trace capture enable */
>  	writel_relaxed(ETB_CTL_CAPT_EN, drvdata->base + ETB_CTL_REG);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&drvdata->csdev->access);
>  }
>  
>  static int etb_enable_hw(struct etb_drvdata *drvdata)
>  {
> -	int rc = coresight_claim_device(drvdata->base);
> +	int rc = coresight_claim_device(drvdata->csdev);
>  
>  	if (rc)
>  		return rc;
> @@ -253,7 +253,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
>  	struct device *dev = &drvdata->csdev->dev;
>  	struct coresight_device *csdev = drvdata->csdev;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	ffcr = readl_relaxed(drvdata->base + ETB_FFCR);
>  	/* stop formatter when a stop has completed */
> @@ -276,7 +276,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
>  			"timeout while waiting for Formatter to Stop\n");
>  	}
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void etb_dump_hw(struct etb_drvdata *drvdata)
> @@ -289,7 +289,7 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
>  	u32 frame_off, frame_endoff;
>  	struct device *dev = &drvdata->csdev->dev;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&drvdata->csdev->access);
>  
>  	read_ptr = readl_relaxed(drvdata->base + ETB_RAM_READ_POINTER);
>  	write_ptr = readl_relaxed(drvdata->base + ETB_RAM_WRITE_POINTER);
> @@ -337,14 +337,14 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
>  
>  	writel_relaxed(read_ptr, drvdata->base + ETB_RAM_READ_POINTER);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&drvdata->csdev->access);
>  }
>  
>  static void etb_disable_hw(struct etb_drvdata *drvdata)
>  {
>  	__etb_disable_hw(drvdata);
>  	etb_dump_hw(drvdata);
> -	coresight_disclaim_device(drvdata->base);
> +	coresight_disclaim_device(drvdata->csdev);
>  }
>  
>  static int etb_disable(struct coresight_device *csdev)
> @@ -448,7 +448,7 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
>  		goto out;
>  
>  	__etb_disable_hw(drvdata);
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&drvdata->csdev->access);
>  
>  	/* unit is in words, not bytes */
>  	read_ptr = readl_relaxed(drvdata->base + ETB_RAM_READ_POINTER);
> @@ -563,7 +563,7 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
>  		handle->head += to_read;
>  
>  	__etb_enable_hw(drvdata);
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&drvdata->csdev->access);
>  out:
>  	spin_unlock_irqrestore(&drvdata->spinlock, flags);
>  
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
> index e8c7649f123e..362f5da90523 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
> @@ -50,11 +50,11 @@ static ssize_t etmsr_show(struct device *dev,
>  
>  	pm_runtime_get_sync(dev->parent);
>  	spin_lock_irqsave(&drvdata->spinlock, flags);
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&drvdata->csdev->access);
>  
>  	val = etm_readl(drvdata, ETMSR);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&drvdata->csdev->access);
>  	spin_unlock_irqrestore(&drvdata->spinlock, flags);
>  	pm_runtime_put(dev->parent);
>  
> @@ -948,9 +948,9 @@ static ssize_t seq_curr_state_show(struct device *dev,
>  	pm_runtime_get_sync(dev->parent);
>  	spin_lock_irqsave(&drvdata->spinlock, flags);
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&drvdata->csdev->access);
>  	val = (etm_readl(drvdata, ETMSQR) & ETM_SQR_MASK);
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&drvdata->csdev->access);
>  
>  	spin_unlock_irqrestore(&drvdata->spinlock, flags);
>  	pm_runtime_put(dev->parent);
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
> index 7ddcb7fcb2d6..d6df7bc97531 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
> @@ -360,10 +360,11 @@ static int etm_enable_hw(struct etm_drvdata *drvdata)
>  	int i, rc;
>  	u32 etmcr;
>  	struct etm_config *config = &drvdata->config;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
> -	rc = coresight_claim_device_unlocked(drvdata->base);
> +	rc = coresight_claim_device_unlocked(csdev);
>  	if (rc)
>  		goto done;
>  
> @@ -423,9 +424,9 @@ static int etm_enable_hw(struct etm_drvdata *drvdata)
>  	etm_clr_prog(drvdata);
>  
>  done:
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  
> -	dev_dbg(&drvdata->csdev->dev, "cpu: %d enable smp call done: %d\n",
> +	dev_dbg(&csdev->dev, "cpu: %d enable smp call done: %d\n",
>  		drvdata->cpu, rc);
>  	return rc;
>  }
> @@ -468,9 +469,9 @@ int etm_get_trace_id(struct etm_drvdata *drvdata)
>  
>  	spin_lock_irqsave(&drvdata->spinlock, flags);
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&drvdata->csdev->access);
>  	trace_id = (etm_readl(drvdata, ETMTRACEIDR) & ETM_TRACEID_MASK);
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&drvdata->csdev->access);
>  
>  	spin_unlock_irqrestore(&drvdata->spinlock, flags);
>  	pm_runtime_put(etm_dev);
> @@ -568,8 +569,9 @@ static void etm_disable_hw(void *info)
>  	int i;
>  	struct etm_drvdata *drvdata = info;
>  	struct etm_config *config = &drvdata->config;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  	etm_set_prog(drvdata);
>  
>  	/* Read back sequencer and counters for post trace analysis */
> @@ -579,22 +581,23 @@ static void etm_disable_hw(void *info)
>  		config->cntr_val[i] = etm_readl(drvdata, ETMCNTVRn(i));
>  
>  	etm_set_pwrdwn(drvdata);
> -	coresight_disclaim_device_unlocked(drvdata->base);
> +	coresight_disclaim_device_unlocked(csdev);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  
> -	dev_dbg(&drvdata->csdev->dev,
> +	dev_dbg(&csdev->dev,
>  		"cpu: %d disable smp call done\n", drvdata->cpu);
>  }
>  
>  static void etm_disable_perf(struct coresight_device *csdev)
>  {
>  	struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> +	struct coresight_device *csdev;
>  
>  	if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
>  		return;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	/* Setting the prog bit disables tracing immediately */
>  	etm_set_prog(drvdata);
> @@ -604,9 +607,9 @@ static void etm_disable_perf(struct coresight_device *csdev)
>  	 * power down the tracer.
>  	 */
>  	etm_set_pwrdwn(drvdata);
> -	coresight_disclaim_device_unlocked(drvdata->base);
> +	coresight_disclaim_device_unlocked(csdev);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void etm_disable_sysfs(struct coresight_device *csdev)
> @@ -732,16 +735,25 @@ static bool etm_arch_supported(u8 arch)
>  	return true;
>  }
>  
> +/*
> + * This function is called even before the csdev is registered.
> + * Thus we cant rely on drvdata->csdev to be valid.
> + */
>  static void etm_init_arch_data(void *info)
>  {
>  	u32 etmidr;
>  	u32 etmccr;
> -	struct etm_drvdata *drvdata = info;
> +	int cpu;
> +	struct etm_drvdata *drvdata;
> +	struct csdev_access *csa = info;
> +
> +	cpu = smp_processor_id();
> +	drvdata = etmdrvdata[cpu];
>  
>  	/* Make sure all registers are accessible */
>  	etm_os_unlock(drvdata);
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csa);
>  
>  	/* First dummy read */
>  	(void)etm_readl(drvdata, ETMPDSR);
> @@ -774,7 +786,7 @@ static void etm_init_arch_data(void *info)
>  
>  	etm_set_pwrdwn(drvdata);
>  	etm_clr_pwrup(drvdata);
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(csa);
>  }
>  
>  static void etm_init_trace_id(struct etm_drvdata *drvdata)
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index d78d79940fc9..ce32d4ebc8b9 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -108,14 +108,15 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
>  {
>  	int i, rc;
>  	struct etmv4_config *config = &drvdata->config;
> -	struct device *etm_dev = &drvdata->csdev->dev;
>  	struct coresight_device *csdev = drvdata->csdev;
> +	struct device *etm_dev = &csdev->dev;
> +	struct csdev_access *csa = &csdev->access;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(csa);
>  
>  	etm4_os_unlock(drvdata);
>  
> -	rc = coresight_claim_device_unlocked(drvdata->base);
> +	rc = coresight_claim_device_unlocked(csdev);
>  	if (rc)
>  		goto done;
>  
> @@ -222,7 +223,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
>  	isb();
>  
>  done:
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(csa);
>  
>  	dev_dbg(etm_dev, "cpu: %d enable smp call done: %d\n",
>  		drvdata->cpu, rc);
> @@ -478,7 +479,7 @@ static void etm4_disable_hw(void *info)
>  	struct coresight_device *csdev = drvdata->csdev;
>  	int i;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	if (!drvdata->skip_power_up) {
>  		/* power can be removed from the trace unit now */
> @@ -519,11 +520,11 @@ static void etm4_disable_hw(void *info)
>  			readl_relaxed(drvdata->base + TRCCNTVRn(i));
>  	}
>  
> -	coresight_disclaim_device_unlocked(drvdata->base);
> +	coresight_disclaim_device_unlocked(csdev);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  
> -	dev_dbg(&drvdata->csdev->dev,
> +	dev_dbg(etm_dev,

Why is this change needed?

>  		"cpu: %d disable smp call done\n", drvdata->cpu);
>  }
>  
> @@ -616,8 +617,12 @@ static const struct coresight_ops etm4_cs_ops = {
>  	.source_ops	= &etm4_source_ops,
>  };
>  
> -
> -static void etm4_init_arch_data(void *__unused)
> +/*
> + * This is called before coresight device is registered. Thus
> + * we must know the access method. drvdata is already available
> + * from per-cpu area.
> + */
> +static void etm4_init_arch_data(void *info)
>  {
>  	u32 etmidr0;
>  	u32 etmidr1;
> @@ -625,6 +630,7 @@ static void etm4_init_arch_data(void *__unused)
>  	u32 etmidr3;
>  	u32 etmidr4;
>  	u32 etmidr5;
> +	struct csdev_access *csa = info;
>  	struct etmv4_drvdata *drvdata;
>  	int i, cpu;
>  
> @@ -637,7 +643,7 @@ static void etm4_init_arch_data(void *__unused)
>  	/* Make sure all registers are accessible */
>  	etm4_os_unlock(drvdata);
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(csa);
>  
>  	/* find all capabilities of the tracing unit */
>  	etmidr0 = readl_relaxed(drvdata->base + TRCIDR0);
> @@ -791,7 +797,7 @@ static void etm4_init_arch_data(void *__unused)
>  	drvdata->nrseqstate = BMVAL(etmidr5, 25, 27);
>  	/* NUMCNTR, bits[30:28] number of counters available for tracing */
>  	drvdata->nr_cntr = BMVAL(etmidr5, 28, 30);
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(csa);
>  }
>  
>  static void etm4_set_default_config(struct etmv4_config *config)
> @@ -1146,11 +1152,13 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  	struct etmv4_save_state *state;
>  	struct coresight_device *csdev = drvdata->csdev;
>  	struct device *etm_dev;
> +	struct csdev_access *csa;
>  
>  	if (WARN_ON(!csdev))
>  		return -ENODEV;
>  
>  	etm_dev = &csdev->dev;
> +	csa = &csdev->access;
>  
>  	/*
>  	 * As recommended by 3.4.1 ("The procedure when powering down the PE")
> @@ -1159,7 +1167,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  	dsb(sy);
>  	isb();
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(csa);
>  
>  	/* Lock the OS lock to disable trace and external debugger access */
>  	etm4_os_lock(drvdata);
> @@ -1268,7 +1276,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  			drvdata->base + TRCPDCR);
>  
>  out:
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(csa);
>  	return ret;
>  }
>  
> @@ -1277,11 +1285,13 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
>  	int i;
>  	struct etmv4_save_state *state = drvdata->save_state;
>  	struct coresight_device *csdev = drvdata->csdev;
> +	struct csdev_access *csa;
>  
>  	if (WARN_ON(!csdev))
>  		return;
>  
> -	CS_UNLOCK(drvdata->base);
> +	csa = &csdev->access;
> +	CS_UNLOCK(csa);
>  
>  	writel_relaxed(state->trcclaimset, drvdata->base + TRCCLAIMSET);
>  
> @@ -1373,7 +1383,7 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
>  
>  	/* Unlock the OS lock to re-enable trace and external debug access */
>  	etm4_os_unlock(drvdata);
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(csa);
>  }
>  
>  static int etm4_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
> @@ -1526,7 +1536,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
>  	etmdrvdata[drvdata->cpu] = drvdata;
>  
>  	if (smp_call_function_single(drvdata->cpu,
> -				etm4_init_arch_data,  NULL, 1))
> +				etm4_init_arch_data,  &desc.access, 1))
>  		dev_err(dev, "ETM arch init failed\n");
>  
>  	ret = etm4_pm_setup_cpuslocked();
> diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
> index 67fc3e3b77d8..d61ffbfe0a5c 100644
> --- a/drivers/hwtracing/coresight/coresight-funnel.c
> +++ b/drivers/hwtracing/coresight/coresight-funnel.c
> @@ -52,13 +52,14 @@ static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
>  {
>  	u32 functl;
>  	int rc = 0;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
>  	/* Claim the device only when we enable the first slave */
>  	if (!(functl & FUNNEL_ENSx_MASK)) {
> -		rc = coresight_claim_device_unlocked(drvdata->base);
> +		rc = coresight_claim_device_unlocked(csdev);
>  		if (rc)
>  			goto done;
>  	}
> @@ -69,7 +70,7 @@ static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
>  	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
>  	writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
>  done:
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  	return rc;
>  }
>  
> @@ -101,8 +102,9 @@ static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
>  				      int inport)
>  {
>  	u32 functl;
> +	struct coresight_device *csdev = drvdata->csdev;

Sometimes a csdev variable is declared, sometimes not as in get_funnel_ctrl_hw()
below and this makes it hard to review all these changes.  Please select a
heuristic and keep with it.  I prefer this version but not dead set on it.  

Also please split in two, on for CS_LOCK/UNLOCK() and another one for the claim
tag functions.

>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
>  	functl &= ~(1 << inport);
> @@ -110,9 +112,9 @@ static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
>  
>  	/* Disclaim the device if none of the slaves are now active */
>  	if (!(functl & FUNNEL_ENSx_MASK))
> -		coresight_disclaim_device_unlocked(drvdata->base);
> +		coresight_disclaim_device_unlocked(csdev);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void funnel_disable(struct coresight_device *csdev, int inport,
> @@ -173,9 +175,9 @@ static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
>  {
>  	u32 functl;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&drvdata->csdev->access);
>  	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&drvdata->csdev->access);
>  
>  	return functl;
>  }
> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> index f2dc625ea585..a87ce11a0ea6 100644
> --- a/drivers/hwtracing/coresight/coresight-priv.h
> +++ b/drivers/hwtracing/coresight/coresight-priv.h
> @@ -108,19 +108,20 @@ static inline void coresight_insert_barrier_packet(void *buf)
>  }
>  
>  
> -static inline void CS_LOCK(void __iomem *addr)
> +static inline void CS_LOCK(struct csdev_access *csa)
>  {
>  	do {
>  		/* Wait for things to settle */
>  		mb();
> -		writel_relaxed(0x0, addr + CORESIGHT_LAR);
> +		csdev_access_relaxed_write32(csa, 0x0, CORESIGHT_LAR);
>  	} while (0);
>  }
>  
> -static inline void CS_UNLOCK(void __iomem *addr)
> +static inline void CS_UNLOCK(struct csdev_access *csa)
>  {
>  	do {
> -		writel_relaxed(CORESIGHT_UNLOCK, addr + CORESIGHT_LAR);
> +		csdev_access_relaxed_write32(csa, CORESIGHT_UNLOCK,
> +					  CORESIGHT_LAR);
>  		/* Make sure everyone has seen this */
>  		mb();
>  	} while (0);
> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
> index 65704ada20a5..4c04d819b1a6 100644
> --- a/drivers/hwtracing/coresight/coresight-replicator.c
> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
> @@ -45,15 +45,20 @@ struct replicator_drvdata {
>  
>  static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
>  
> -	if (!coresight_claim_device_unlocked(drvdata->base)) {
> +	if (WARN_ON(!csdev))
> +		return;
> +
> +	CS_UNLOCK(&csdev->access);
> +
> +	if (!coresight_claim_device_unlocked(csdev)) {
>  		writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
>  		writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
> -		coresight_disclaim_device_unlocked(drvdata->base);
> +		coresight_disclaim_device_unlocked(csdev);
>  	}
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  /*
> @@ -70,8 +75,9 @@ static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
>  {
>  	int rc = 0;
>  	u32 id0val, id1val;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	id0val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0);
>  	id1val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1);
> @@ -84,7 +90,7 @@ static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
>  		id0val = id1val = 0xff;
>  
>  	if (id0val == 0xff && id1val == 0xff)
> -		rc = coresight_claim_device_unlocked(drvdata->base);
> +		rc = coresight_claim_device_unlocked(csdev);
>  
>  	if (!rc) {
>  		switch (outport) {
> @@ -106,7 +112,7 @@ static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
>  		writel_relaxed(id1val, drvdata->base + REPLICATOR_IDFILTER1);
>  	}
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  
>  	return rc;
>  }
> @@ -140,6 +146,7 @@ static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
>  				       int inport, int outport)
>  {
>  	u32 reg;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
>  	switch (outport) {
>  	case 0:
> @@ -153,15 +160,15 @@ static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
>  		return;
>  	}
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	/* disable the flow of ATB data through port */
>  	writel_relaxed(0xff, drvdata->base + reg);
>  
>  	if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
>  	    (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
> -		coresight_disclaim_device_unlocked(drvdata->base);
> -	CS_LOCK(drvdata->base);
> +		coresight_disclaim_device_unlocked(csdev);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void replicator_disable(struct coresight_device *csdev, int inport,
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index b704000c96b8..112221dd6dd3 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -148,7 +148,9 @@ struct stm_drvdata {
>  
>  static void stm_hwevent_enable_hw(struct stm_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	CS_UNLOCK(&csdev->access);
>  
>  	writel_relaxed(drvdata->stmhebsr, drvdata->base + STMHEBSR);
>  	writel_relaxed(drvdata->stmheter, drvdata->base + STMHETER);
> @@ -157,29 +159,33 @@ static void stm_hwevent_enable_hw(struct stm_drvdata *drvdata)
>  		       0x04,	/* Error detection on event tracing */
>  		       drvdata->base + STMHEMCR);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void stm_port_enable_hw(struct stm_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	CS_UNLOCK(&csdev->access);
>  	/* ATB trigger enable on direct writes to TRIG locations */
>  	writel_relaxed(0x10,
>  		       drvdata->base + STMSPTRIGCSR);
>  	writel_relaxed(drvdata->stmspscr, drvdata->base + STMSPSCR);
>  	writel_relaxed(drvdata->stmsper, drvdata->base + STMSPER);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void stm_enable_hw(struct stm_drvdata *drvdata)
>  {
> +	struct coresight_device *csdev = drvdata->csdev;
> +
>  	if (drvdata->stmheer)
>  		stm_hwevent_enable_hw(drvdata);
>  
>  	stm_port_enable_hw(drvdata);
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	/* 4096 byte between synchronisation packets */
>  	writel_relaxed(0xFFF, drvdata->base + STMSYNCR);
> @@ -188,7 +194,7 @@ static void stm_enable_hw(struct stm_drvdata *drvdata)
>  			0x01),			 /* global STM enable */
>  			drvdata->base + STMTCSR);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static int stm_enable(struct coresight_device *csdev,
> @@ -218,36 +224,41 @@ static int stm_enable(struct coresight_device *csdev,
>  
>  static void stm_hwevent_disable_hw(struct stm_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	CS_UNLOCK(&csdev->access);
>  
>  	writel_relaxed(0x0, drvdata->base + STMHEMCR);
>  	writel_relaxed(0x0, drvdata->base + STMHEER);
>  	writel_relaxed(0x0, drvdata->base + STMHETER);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void stm_port_disable_hw(struct stm_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	CS_UNLOCK(&csdev->access);
>  
>  	writel_relaxed(0x0, drvdata->base + STMSPER);
>  	writel_relaxed(0x0, drvdata->base + STMSPTRIGCSR);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void stm_disable_hw(struct stm_drvdata *drvdata)
>  {
>  	u32 val;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	val = readl_relaxed(drvdata->base + STMTCSR);
>  	val &= ~0x1; /* clear global STM enable [0] */
>  	writel_relaxed(val, drvdata->base + STMTCSR);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  
>  	stm_port_disable_hw(drvdata);
>  	if (drvdata->stmheer)
> @@ -534,6 +545,8 @@ static ssize_t port_select_store(struct device *dev,
>  				 const char *buf, size_t size)
>  {
>  	struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
>  	unsigned long val, stmsper;
>  	int ret = 0;
>  
> @@ -545,13 +558,13 @@ static ssize_t port_select_store(struct device *dev,
>  	drvdata->stmspscr = val;
>  
>  	if (local_read(&drvdata->mode)) {
> -		CS_UNLOCK(drvdata->base);
> +		CS_UNLOCK(&csdev->access);
>  		/* Process as per ARM's TRM recommendation */
>  		stmsper = readl_relaxed(drvdata->base + STMSPER);
>  		writel_relaxed(0x0, drvdata->base + STMSPER);
>  		writel_relaxed(drvdata->stmspscr, drvdata->base + STMSPSCR);
>  		writel_relaxed(stmsper, drvdata->base + STMSPER);
> -		CS_LOCK(drvdata->base);
> +		CS_LOCK(&csdev->access);
>  	}
>  	spin_unlock(&drvdata->spinlock);
>  
> @@ -581,6 +594,7 @@ static ssize_t port_enable_store(struct device *dev,
>  				 const char *buf, size_t size)
>  {
>  	struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	struct coresight_device *csdev = drvdata->csdev;
>  	unsigned long val;
>  	int ret = 0;
>  
> @@ -592,9 +606,9 @@ static ssize_t port_enable_store(struct device *dev,
>  	drvdata->stmsper = val;
>  
>  	if (local_read(&drvdata->mode)) {
> -		CS_UNLOCK(drvdata->base);
> +		CS_UNLOCK(&csdev->access);
>  		writel_relaxed(drvdata->stmsper, drvdata->base + STMSPER);
> -		CS_LOCK(drvdata->base);
> +		CS_LOCK(&csdev->access);
>  	}
>  	spin_unlock(&drvdata->spinlock);
>  
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> index 6375504ba8b0..00c82a6f5f4a 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> @@ -18,7 +18,9 @@ static int tmc_set_etf_buffer(struct coresight_device *csdev,
>  
>  static void __tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	CS_UNLOCK(&csdev->access);
>  
>  	/* Wait for TMCSReady bit to be set */
>  	tmc_wait_for_tmcready(drvdata);
> @@ -32,12 +34,12 @@ static void __tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
>  	writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
>  	tmc_enable_hw(drvdata);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static int tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
>  {
> -	int rc = coresight_claim_device(drvdata->base);
> +	int rc = coresight_claim_device(drvdata->csdev);
>  
>  	if (rc)
>  		return rc;
> @@ -71,7 +73,9 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
>  
>  static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	CS_UNLOCK(&csdev->access);
>  
>  	tmc_flush_and_stop(drvdata);
>  	/*
> @@ -82,18 +86,20 @@ static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
>  		tmc_etb_dump_hw(drvdata);
>  	tmc_disable_hw(drvdata);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
>  {
>  	__tmc_etb_disable_hw(drvdata);
> -	coresight_disclaim_device(drvdata->base);
> +	coresight_disclaim_device(drvdata->csdev);
>  }
>  
>  static void __tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	CS_UNLOCK(&csdev->access);
>  
>  	/* Wait for TMCSReady bit to be set */
>  	tmc_wait_for_tmcready(drvdata);
> @@ -104,12 +110,12 @@ static void __tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
>  	writel_relaxed(0x0, drvdata->base + TMC_BUFWM);
>  	tmc_enable_hw(drvdata);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static int tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
>  {
> -	int rc = coresight_claim_device(drvdata->base);
> +	int rc = coresight_claim_device(drvdata->csdev);
>  
>  	if (rc)
>  		return rc;
> @@ -120,12 +126,14 @@ static int tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
>  
>  static void tmc_etf_disable_hw(struct tmc_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	CS_UNLOCK(&csdev->access);
>  
>  	tmc_flush_and_stop(drvdata);
>  	tmc_disable_hw(drvdata);
> -	coresight_disclaim_device_unlocked(drvdata->base);
> -	CS_LOCK(drvdata->base);
> +	coresight_disclaim_device_unlocked(csdev);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  /*
> @@ -464,7 +472,7 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
>  	if (atomic_read(csdev->refcnt) != 1)
>  		goto out;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	tmc_flush_and_stop(drvdata);
>  
> @@ -549,7 +557,7 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
>  	if (buf->snapshot)
>  		handle->head += to_read;
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  out:
>  	spin_unlock_irqrestore(&drvdata->spinlock, flags);
>  
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> index b29c2db94d96..a9ce3be44e2c 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> @@ -952,8 +952,9 @@ static void __tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
>  {
>  	u32 axictl, sts;
>  	struct etr_buf *etr_buf = drvdata->etr_buf;
> +	struct coresight_device *csdev = drvdata->csdev;
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	/* Wait for TMCSReady bit to be set */
>  	tmc_wait_for_tmcready(drvdata);
> @@ -995,7 +996,7 @@ static void __tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
>  	writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
>  	tmc_enable_hw(drvdata);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  static int tmc_etr_enable_hw(struct tmc_drvdata *drvdata,
> @@ -1021,7 +1022,7 @@ static int tmc_etr_enable_hw(struct tmc_drvdata *drvdata,
>  	rc = tmc_etr_enable_catu(drvdata, etr_buf);
>  	if (rc)
>  		return rc;
> -	rc = coresight_claim_device(drvdata->base);
> +	rc = coresight_claim_device(drvdata->csdev);
>  	if (!rc) {
>  		drvdata->etr_buf = etr_buf;
>  		__tmc_etr_enable_hw(drvdata);
> @@ -1094,7 +1095,9 @@ static void tmc_etr_sync_sysfs_buf(struct tmc_drvdata *drvdata)
>  
>  static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
>  {
> -	CS_UNLOCK(drvdata->base);
> +	struct coresight_device *csdev = drvdata->csdev;
> +
> +	CS_UNLOCK(&csdev->access);
>  
>  	tmc_flush_and_stop(drvdata);
>  	/*
> @@ -1106,7 +1109,7 @@ static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
>  
>  	tmc_disable_hw(drvdata);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  
>  }
>  
> @@ -1115,7 +1118,7 @@ void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
>  	__tmc_etr_disable_hw(drvdata);
>  	/* Disable CATU device if this ETR is connected to one */
>  	tmc_etr_disable_catu(drvdata);
> -	coresight_disclaim_device(drvdata->base);
> +	coresight_disclaim_device(drvdata->csdev);
>  	/* Reset the ETR buf used by hardware */
>  	drvdata->etr_buf = NULL;
>  }
> @@ -1497,12 +1500,12 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
>  		goto out;
>  	}
>  
> -	CS_UNLOCK(drvdata->base);
> +	CS_UNLOCK(&csdev->access);
>  
>  	tmc_flush_and_stop(drvdata);
>  	tmc_sync_etr_buf(drvdata);
>  
> -	CS_LOCK(drvdata->base);
> +	CS_LOCK(&csdev->access);
>  	spin_unlock_irqrestore(&drvdata->spinlock, flags);
>  
>  	lost = etr_buf->full;
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index 282d80e97265..8586c015d37a 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -62,11 +62,11 @@ struct tpiu_drvdata {
>  
>  static void tpiu_enable_hw(struct csdev_access *csa)
>  {
> -	CS_UNLOCK(csa->base);
> +	CS_UNLOCK(csa);
>  
>  	/* TODO: fill this up */
>  
> -	CS_LOCK(csa->base);
> +	CS_LOCK(csa);
>  }
>  
>  static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused)
> @@ -79,7 +79,8 @@ static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused)
>  
>  static void tpiu_disable_hw(struct csdev_access *csa)
>  {
> -	CS_UNLOCK(csa->base);
> +
> +	CS_UNLOCK(csa);
>  
>  	/* Clear formatter and stop on flush */
>  	csdev_access_relaxed_write32(csa, FFCR_STOP_FI, TPIU_FFCR);
> @@ -90,7 +91,7 @@ static void tpiu_disable_hw(struct csdev_access *csa)
>  	/* Wait for formatter to stop */
>  	coresight_timeout(csa, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
>  
> -	CS_LOCK(csa->base);
> +	CS_LOCK(csa);
>  }
>  
>  static int tpiu_disable(struct coresight_device *csdev)
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index 21e7615fcbc8..c1b4355d2211 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -130,30 +130,32 @@ static int coresight_find_link_outport(struct coresight_device *csdev,
>  	return -ENODEV;
>  }
>  
> -static inline u32 coresight_read_claim_tags(void __iomem *base)
> +static inline u32 coresight_read_claim_tags(struct coresight_device *csdev)
>  {
> -	return readl_relaxed(base + CORESIGHT_CLAIMCLR);
> +	return coresight_relaxed_read32(csdev, CORESIGHT_CLAIMCLR);
>  }
>  
> -static inline bool coresight_is_claimed_self_hosted(void __iomem *base)
> +static inline bool coresight_is_claimed_self_hosted(struct coresight_device *csdev)
>  {
> -	return coresight_read_claim_tags(base) == CORESIGHT_CLAIM_SELF_HOSTED;
> +	return coresight_read_claim_tags(csdev) == CORESIGHT_CLAIM_SELF_HOSTED;
>  }
>  
> -static inline bool coresight_is_claimed_any(void __iomem *base)
> +static inline bool coresight_is_claimed_any(struct coresight_device *csdev)
>  {
> -	return coresight_read_claim_tags(base) != 0;
> +	return coresight_read_claim_tags(csdev) != 0;
>  }
>  
> -static inline void coresight_set_claim_tags(void __iomem *base)
> +static inline void coresight_set_claim_tags(struct coresight_device *csdev)
>  {
> -	writel_relaxed(CORESIGHT_CLAIM_SELF_HOSTED, base + CORESIGHT_CLAIMSET);
> +	coresight_relaxed_write32(csdev, CORESIGHT_CLAIM_SELF_HOSTED,
> +				  CORESIGHT_CLAIMSET);
>  	isb();
>  }
>  
> -static inline void coresight_clear_claim_tags(void __iomem *base)
> +static inline void coresight_clear_claim_tags(struct coresight_device *csdev)
>  {
> -	writel_relaxed(CORESIGHT_CLAIM_SELF_HOSTED, base + CORESIGHT_CLAIMCLR);
> +	coresight_relaxed_write32(csdev, CORESIGHT_CLAIM_SELF_HOSTED,
> +				  CORESIGHT_CLAIMCLR);
>  	isb();
>  }
>  
> @@ -167,26 +169,32 @@ static inline void coresight_clear_claim_tags(void __iomem *base)
>   * Called with CS_UNLOCKed for the component.
>   * Returns : 0 on success
>   */
> -int coresight_claim_device_unlocked(void __iomem *base)
> +int coresight_claim_device_unlocked(struct coresight_device *csdev)
>  {
> -	if (coresight_is_claimed_any(base))
> +	if (WARN_ON(!csdev))
> +		return -EINVAL;
> +
> +	if (coresight_is_claimed_any(csdev))
>  		return -EBUSY;
>  
> -	coresight_set_claim_tags(base);
> -	if (coresight_is_claimed_self_hosted(base))
> +	coresight_set_claim_tags(csdev);
> +	if (coresight_is_claimed_self_hosted(csdev))
>  		return 0;
>  	/* There was a race setting the tags, clean up and fail */
> -	coresight_clear_claim_tags(base);
> +	coresight_clear_claim_tags(csdev);
>  	return -EBUSY;
>  }
>  
> -int coresight_claim_device(void __iomem *base)
> +int coresight_claim_device(struct coresight_device *csdev)
>  {
>  	int rc;
>  
> -	CS_UNLOCK(base);
> -	rc = coresight_claim_device_unlocked(base);
> -	CS_LOCK(base);
> +	if (WARN_ON(!csdev))
> +		return -EINVAL;
> +
> +	CS_UNLOCK(&csdev->access);
> +	rc = coresight_claim_device_unlocked(csdev);
> +	CS_LOCK(&csdev->access);
>  
>  	return rc;
>  }
> @@ -195,11 +203,14 @@ int coresight_claim_device(void __iomem *base)
>   * coresight_disclaim_device_unlocked : Clear the claim tags for the device.
>   * Called with CS_UNLOCKed for the component.
>   */
> -void coresight_disclaim_device_unlocked(void __iomem *base)
> +void coresight_disclaim_device_unlocked(struct coresight_device *csdev)
>  {
>  
> -	if (coresight_is_claimed_self_hosted(base))
> -		coresight_clear_claim_tags(base);
> +	if (WARN_ON(!csdev))
> +		return;
> +
> +	if (coresight_is_claimed_self_hosted(csdev))
> +		coresight_clear_claim_tags(csdev);
>  	else
>  		/*
>  		 * The external agent may have not honoured our claim
> @@ -209,11 +220,14 @@ void coresight_disclaim_device_unlocked(void __iomem *base)
>  		WARN_ON_ONCE(1);
>  }
>  
> -void coresight_disclaim_device(void __iomem *base)
> +void coresight_disclaim_device(struct coresight_device *csdev)
>  {
> -	CS_UNLOCK(base);
> -	coresight_disclaim_device_unlocked(base);
> -	CS_LOCK(base);
> +	if (WARN_ON(!csdev))
> +		return;
> +
> +	CS_UNLOCK(&csdev->access);
> +	coresight_disclaim_device_unlocked(csdev);
> +	CS_LOCK(&csdev->access);
>  }
>  
>  /* enable or disable an associated CTI device of the supplied CS device */
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 2989306f6041..c0cccdc8f9be 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -438,11 +438,11 @@ extern int coresight_timeout(struct csdev_access *csa,
>  			     int position,
>  			     int value);
>  
> -extern int coresight_claim_device(void __iomem *base);
> -extern int coresight_claim_device_unlocked(void __iomem *base);
> +extern int coresight_claim_device(struct coresight_device *csdev);
> +extern int coresight_claim_device_unlocked(struct coresight_device *csdev);
>  
> -extern void coresight_disclaim_device(void __iomem *base);
> -extern void coresight_disclaim_device_unlocked(void __iomem *base);
> +extern void coresight_disclaim_device(struct coresight_device *csdev);
> +extern void coresight_disclaim_device_unlocked(struct coresight_device *csdev);
>  extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
>  					 struct device *dev);
>  
> @@ -471,18 +471,18 @@ static inline int coresight_timeout(struct csdev_access *csa,
>  	return 1;
>  }
>  
> -static inline int coresight_claim_device_unlocked(void __iomem *base)
> +static inline int coresight_claim_device_unlocked(struct coresight_device *csdev)
>  {
>  	return -EINVAL;
>  }
>  
> -static inline int coresight_claim_device(void __iomem *base)
> +static inline int coresight_claim_device(struct coresight_device *csdev)
>  {
>  	return -EINVAL;
>  }
>  
> -static inline void coresight_disclaim_device(void __iomem *base) {}
> -static inline void coresight_disclaim_device_unlocked(void __iomem *base) {}
> +static inline void coresight_disclaim_device(struct coresight_device *csdev) {}
> +static inline void coresight_disclaim_device_unlocked(struct coresight_device *csdev) {}
>  
>  static inline bool coresight_loses_context_with_cpu(struct device *dev)
>  {
> -- 
> 2.24.1
> 

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Re: [RFC PATCH 06/14] coresight: Convert claim and lock operations to use access wrappers

[Suzuki K Poulose]

On 07/30/2020 08:54 PM, Mathieu Poirier wrote:
> On Wed, Jul 22, 2020 at 06:20:32PM +0100, Suzuki K Poulose wrote:
>> Convert the CoreSight CLAIM set/clear, LOCK/UNLOCK operations to
>> use the coresight device access abstraction.
>>
>> Mostly a mechanical change.
>>
>> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
>> Cc: Mike Leach <mike.leach@linaro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-catu.c  | 14 ++--
>>   .../hwtracing/coresight/coresight-cpu-debug.c | 26 ++++++--
>>   .../hwtracing/coresight/coresight-cti-sysfs.c |  4 +-
>>   drivers/hwtracing/coresight/coresight-cti.c   | 30 +++++----
>>   drivers/hwtracing/coresight/coresight-etb10.c | 20 +++---
>>   .../coresight/coresight-etm3x-sysfs.c         |  8 +--
>>   drivers/hwtracing/coresight/coresight-etm3x.c | 44 ++++++++-----
>>   drivers/hwtracing/coresight/coresight-etm4x.c | 44 ++++++++-----
>>   .../hwtracing/coresight/coresight-funnel.c    | 18 ++---
>>   drivers/hwtracing/coresight/coresight-priv.h  |  9 +--
>>   .../coresight/coresight-replicator.c          | 27 +++++---
>>   drivers/hwtracing/coresight/coresight-stm.c   | 46 ++++++++-----
>>   .../hwtracing/coresight/coresight-tmc-etf.c   | 36 ++++++----
>>   .../hwtracing/coresight/coresight-tmc-etr.c   | 19 +++---
>>   drivers/hwtracing/coresight/coresight-tpiu.c  |  9 +--
>>   drivers/hwtracing/coresight/coresight.c       | 66 +++++++++++--------
>>   include/linux/coresight.h                     | 16 ++---
>>   17 files changed, 266 insertions(+), 170 deletions(-)
>>

...

>> diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
>> index 67fc3e3b77d8..d61ffbfe0a5c 100644
>> --- a/drivers/hwtracing/coresight/coresight-funnel.c
>> +++ b/drivers/hwtracing/coresight/coresight-funnel.c
>> @@ -52,13 +52,14 @@ static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
>>   {
>>   	u32 functl;
>>   	int rc = 0;
>> +	struct coresight_device *csdev = drvdata->csdev;
>>   
>> -	CS_UNLOCK(drvdata->base);
>> +	CS_UNLOCK(&csdev->access);
>>   
>>   	functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
>>   	/* Claim the device only when we enable the first slave */
>>   	if (!(functl & FUNNEL_ENSx_MASK)) {
>> -		rc = coresight_claim_device_unlocked(drvdata->base);
>> +		rc = coresight_claim_device_unlocked(csdev);
>>   		if (rc)
>>   			goto done;
>>   	}
>> @@ -69,7 +70,7 @@ static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
>>   	writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
>>   	writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
>>   done:
>> -	CS_LOCK(drvdata->base);
>> +	CS_LOCK(&csdev->access);
>>   	return rc;
>>   }
>>   
>> @@ -101,8 +102,9 @@ static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
>>   				      int inport)
>>   {
>>   	u32 functl;
>> +	struct coresight_device *csdev = drvdata->csdev;
> 
> Sometimes a csdev variable is declared, sometimes not as in get_funnel_ctrl_hw()
> below and this makes it hard to review all these changes.  Please select a
> heuristic and keep with it.  I prefer this version but not dead set on it.

Agreed, will change.


> 
> Also please split in two, on for CS_LOCK/UNLOCK() and another one for the claim
> tag functions.

There is a minor dependency here. CS_LOCK/UNLOCK is issued from the 
coresight_{dis}claim_device() versions. One option is to choose the
following order:

1) convert claim/disclaim to accept csdev.
    And use csdev->access->base for CS_LOCK/UNLOCK.

2) Convert all CS_LOCK/UNLOCK to work on csdev->access.

I thought having this at one go might look better. But I agree, it is
better to split this one. I will give it a go.

Cheers
Suzuki

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[RFC PATCH 07/14] coresight: etm4x: Always read the registers on the host CPU

[Suzuki K Poulose]

As we are about to add support for sysreg access to ETM4.4+ components,
make sure that we read the registers only on the host CPU.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 .../coresight/coresight-etm4x-sysfs.c         | 23 ++++++++-----------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index b673e738bc9a..90c75ba31a0c 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
@@ -2341,23 +2341,20 @@ static u32 etmv4_cross_read(const struct device *dev, u32 offset)
 	return reg.data;
 }
 
-#define coresight_etm4x_reg(name, offset)			\
-	coresight_simple_reg32(struct etmv4_drvdata, name, offset)
-
 #define coresight_etm4x_cross_read(name, offset)			\
 	coresight_simple_func(struct etmv4_drvdata, etmv4_cross_read,	\
 			      name, offset)
 
-coresight_etm4x_reg(trcpdcr, TRCPDCR);
-coresight_etm4x_reg(trcpdsr, TRCPDSR);
-coresight_etm4x_reg(trclsr, TRCLSR);
-coresight_etm4x_reg(trcauthstatus, TRCAUTHSTATUS);
-coresight_etm4x_reg(trcdevid, TRCDEVID);
-coresight_etm4x_reg(trcdevtype, TRCDEVTYPE);
-coresight_etm4x_reg(trcpidr0, TRCPIDR0);
-coresight_etm4x_reg(trcpidr1, TRCPIDR1);
-coresight_etm4x_reg(trcpidr2, TRCPIDR2);
-coresight_etm4x_reg(trcpidr3, TRCPIDR3);
+coresight_etm4x_cross_read(trcpdcr, TRCPDCR);
+coresight_etm4x_cross_read(trcpdsr, TRCPDSR);
+coresight_etm4x_cross_read(trclsr, TRCLSR);
+coresight_etm4x_cross_read(trcauthstatus, TRCAUTHSTATUS);
+coresight_etm4x_cross_read(trcdevid, TRCDEVID);
+coresight_etm4x_cross_read(trcdevtype, TRCDEVTYPE);
+coresight_etm4x_cross_read(trcpidr0, TRCPIDR0);
+coresight_etm4x_cross_read(trcpidr1, TRCPIDR1);
+coresight_etm4x_cross_read(trcpidr2, TRCPIDR2);
+coresight_etm4x_cross_read(trcpidr3, TRCPIDR3);
 coresight_etm4x_cross_read(trcoslsr, TRCOSLSR);
 coresight_etm4x_cross_read(trcconfig, TRCCONFIGR);
 coresight_etm4x_cross_read(trctraceid, TRCTRACEIDR);
-- 
2.24.1


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Re: [RFC PATCH 07/14] coresight: etm4x: Always read the registers on the host CPU

[Mathieu Poirier]

On Wed, Jul 22, 2020 at 06:20:33PM +0100, Suzuki K Poulose wrote:
> As we are about to add support for sysreg access to ETM4.4+ components,
> make sure that we read the registers only on the host CPU.
> 
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>

>  .../coresight/coresight-etm4x-sysfs.c         | 23 ++++++++-----------
>  1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> index b673e738bc9a..90c75ba31a0c 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> @@ -2341,23 +2341,20 @@ static u32 etmv4_cross_read(const struct device *dev, u32 offset)
>  	return reg.data;
>  }
>  
> -#define coresight_etm4x_reg(name, offset)			\
> -	coresight_simple_reg32(struct etmv4_drvdata, name, offset)
> -
>  #define coresight_etm4x_cross_read(name, offset)			\
>  	coresight_simple_func(struct etmv4_drvdata, etmv4_cross_read,	\
>  			      name, offset)
>  
> -coresight_etm4x_reg(trcpdcr, TRCPDCR);
> -coresight_etm4x_reg(trcpdsr, TRCPDSR);
> -coresight_etm4x_reg(trclsr, TRCLSR);
> -coresight_etm4x_reg(trcauthstatus, TRCAUTHSTATUS);
> -coresight_etm4x_reg(trcdevid, TRCDEVID);
> -coresight_etm4x_reg(trcdevtype, TRCDEVTYPE);
> -coresight_etm4x_reg(trcpidr0, TRCPIDR0);
> -coresight_etm4x_reg(trcpidr1, TRCPIDR1);
> -coresight_etm4x_reg(trcpidr2, TRCPIDR2);
> -coresight_etm4x_reg(trcpidr3, TRCPIDR3);
> +coresight_etm4x_cross_read(trcpdcr, TRCPDCR);
> +coresight_etm4x_cross_read(trcpdsr, TRCPDSR);
> +coresight_etm4x_cross_read(trclsr, TRCLSR);
> +coresight_etm4x_cross_read(trcauthstatus, TRCAUTHSTATUS);
> +coresight_etm4x_cross_read(trcdevid, TRCDEVID);
> +coresight_etm4x_cross_read(trcdevtype, TRCDEVTYPE);
> +coresight_etm4x_cross_read(trcpidr0, TRCPIDR0);
> +coresight_etm4x_cross_read(trcpidr1, TRCPIDR1);
> +coresight_etm4x_cross_read(trcpidr2, TRCPIDR2);
> +coresight_etm4x_cross_read(trcpidr3, TRCPIDR3);
>  coresight_etm4x_cross_read(trcoslsr, TRCOSLSR);
>  coresight_etm4x_cross_read(trcconfig, TRCCONFIGR);
>  coresight_etm4x_cross_read(trctraceid, TRCTRACEIDR);
> -- 
> 2.24.1
> 

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[RFC PATCH 08/14] coresight: etm4x: Convert all register accesses

[Suzuki K Poulose]

Convert all register accesses from etm4x driver to use a wrapper
to allow switching the access at runtime with little overhead.

co-developed by sed tool ;-), mostly equivalent to :

s/readl\(_relaxed\)\?(drvdata->base + \(.*\))/etm4x_\1_read32(csdev, \2)
s/writel\(_relaxed\)\?(\(.*\), drvdata->base + \(.*\))/etm4x_\1_write32(csdev, \2, \3)

We don't want to replace them with the csdev_access_* to
avoid a function call for every register access for system
register access.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 .../coresight/coresight-etm4x-sysfs.c         |   9 +-
 drivers/hwtracing/coresight/coresight-etm4x.c | 334 +++++++++---------
 drivers/hwtracing/coresight/coresight-etm4x.h |  24 ++
 3 files changed, 189 insertions(+), 178 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index 90c75ba31a0c..fe40355f6a2c 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
@@ -2316,7 +2316,8 @@ static struct attribute *coresight_etmv4_attrs[] = {
 };
 
 struct etmv4_reg {
-	void __iomem *addr;
+	struct coresight_device *csdev;
+	u32 offset;
 	u32 data;
 };
 
@@ -2324,7 +2325,7 @@ static void do_smp_cross_read(void *data)
 {
 	struct etmv4_reg *reg = data;
 
-	reg->data = readl_relaxed(reg->addr);
+	reg->data = etm4x_relaxed_read32(&reg->csdev->access, reg->offset);
 }
 
 static u32 etmv4_cross_read(const struct device *dev, u32 offset)
@@ -2332,7 +2333,9 @@ static u32 etmv4_cross_read(const struct device *dev, u32 offset)
 	struct etmv4_drvdata *drvdata = dev_get_drvdata(dev);
 	struct etmv4_reg reg;
 
-	reg.addr = drvdata->base + offset;
+	reg.offset = offset;
+	reg.csdev = drvdata->csdev;
+
 	/*
 	 * smp cross call ensures the CPU will be powered up before
 	 * accessing the ETMv4 trace core registers
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index ce32d4ebc8b9..b901c91d3ee4 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -57,18 +57,28 @@ static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
 
 static enum cpuhp_state hp_online;
 
-static void etm4_os_unlock(struct etmv4_drvdata *drvdata)
+static void etm4_os_unlock_csa(struct etmv4_drvdata *drvdata, struct csdev_access *csa)
 {
 	/* Writing 0 to TRCOSLAR unlocks the trace registers */
-	writel_relaxed(0x0, drvdata->base + TRCOSLAR);
+	etm4x_relaxed_write32(csa, 0x0, TRCOSLAR);
 	drvdata->os_unlock = true;
 	isb();
 }
 
+static void etm4_os_unlock(struct etmv4_drvdata *drvdata)
+{
+	if (!WARN_ON(!drvdata->csdev))
+		etm4_os_unlock_csa(drvdata, &drvdata->csdev->access);
+
+}
+
 static void etm4_os_lock(struct etmv4_drvdata *drvdata)
 {
+	if (WARN_ON(!drvdata->csdev))
+		return;
+
 	/* Writing 0x1 to TRCOSLAR locks the trace registers */
-	writel_relaxed(0x1, drvdata->base + TRCOSLAR);
+	etm4x_relaxed_write32(&drvdata->csdev->access, 0x1, TRCOSLAR);
 	drvdata->os_unlock = false;
 	isb();
 }
@@ -121,44 +131,38 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
 		goto done;
 
 	/* Disable the trace unit before programming trace registers */
-	writel_relaxed(0, drvdata->base + TRCPRGCTLR);
+	etm4x_relaxed_write32(csa, 0, TRCPRGCTLR);
 
 	/* wait for TRCSTATR.IDLE to go up */
 	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
 		dev_err(etm_dev,
 			"timeout while waiting for Idle Trace Status\n");
 
-	writel_relaxed(config->pe_sel, drvdata->base + TRCPROCSELR);
-	writel_relaxed(config->cfg, drvdata->base + TRCCONFIGR);
+	etm4x_relaxed_write32(csa, config->pe_sel, TRCPROCSELR);
+	etm4x_relaxed_write32(csa, config->cfg, TRCCONFIGR);
 	/* nothing specific implemented */
-	writel_relaxed(0x0, drvdata->base + TRCAUXCTLR);
-	writel_relaxed(config->eventctrl0, drvdata->base + TRCEVENTCTL0R);
-	writel_relaxed(config->eventctrl1, drvdata->base + TRCEVENTCTL1R);
-	writel_relaxed(config->stall_ctrl, drvdata->base + TRCSTALLCTLR);
-	writel_relaxed(config->ts_ctrl, drvdata->base + TRCTSCTLR);
-	writel_relaxed(config->syncfreq, drvdata->base + TRCSYNCPR);
-	writel_relaxed(config->ccctlr, drvdata->base + TRCCCCTLR);
-	writel_relaxed(config->bb_ctrl, drvdata->base + TRCBBCTLR);
-	writel_relaxed(drvdata->trcid, drvdata->base + TRCTRACEIDR);
-	writel_relaxed(config->vinst_ctrl, drvdata->base + TRCVICTLR);
-	writel_relaxed(config->viiectlr, drvdata->base + TRCVIIECTLR);
-	writel_relaxed(config->vissctlr,
-		       drvdata->base + TRCVISSCTLR);
-	writel_relaxed(config->vipcssctlr,
-		       drvdata->base + TRCVIPCSSCTLR);
+	etm4x_relaxed_write32(csa, 0x0, TRCAUXCTLR);
+	etm4x_relaxed_write32(csa, config->eventctrl0, TRCEVENTCTL0R);
+	etm4x_relaxed_write32(csa, config->eventctrl1, TRCEVENTCTL1R);
+	etm4x_relaxed_write32(csa, config->stall_ctrl, TRCSTALLCTLR);
+	etm4x_relaxed_write32(csa, config->ts_ctrl, TRCTSCTLR);
+	etm4x_relaxed_write32(csa, config->syncfreq, TRCSYNCPR);
+	etm4x_relaxed_write32(csa, config->ccctlr, TRCCCCTLR);
+	etm4x_relaxed_write32(csa, config->bb_ctrl, TRCBBCTLR);
+	etm4x_relaxed_write32(csa, drvdata->trcid, TRCTRACEIDR);
+	etm4x_relaxed_write32(csa, config->vinst_ctrl, TRCVICTLR);
+	etm4x_relaxed_write32(csa, config->viiectlr, TRCVIIECTLR);
+	etm4x_relaxed_write32(csa, config->vissctlr, TRCVISSCTLR);
+	etm4x_relaxed_write32(csa, config->vipcssctlr, TRCVIPCSSCTLR);
 	for (i = 0; i < drvdata->nrseqstate - 1; i++)
-		writel_relaxed(config->seq_ctrl[i],
-			       drvdata->base + TRCSEQEVRn(i));
-	writel_relaxed(config->seq_rst, drvdata->base + TRCSEQRSTEVR);
-	writel_relaxed(config->seq_state, drvdata->base + TRCSEQSTR);
-	writel_relaxed(config->ext_inp, drvdata->base + TRCEXTINSELR);
+		etm4x_relaxed_write32(csa, config->seq_ctrl[i], TRCSEQEVRn(i));
+	etm4x_relaxed_write32(csa, config->seq_rst, TRCSEQRSTEVR);
+	etm4x_relaxed_write32(csa, config->seq_state, TRCSEQSTR);
+	etm4x_relaxed_write32(csa, config->ext_inp, TRCEXTINSELR);
 	for (i = 0; i < drvdata->nr_cntr; i++) {
-		writel_relaxed(config->cntrldvr[i],
-			       drvdata->base + TRCCNTRLDVRn(i));
-		writel_relaxed(config->cntr_ctrl[i],
-			       drvdata->base + TRCCNTCTLRn(i));
-		writel_relaxed(config->cntr_val[i],
-			       drvdata->base + TRCCNTVRn(i));
+		etm4x_relaxed_write32(csa, config->cntrldvr[i], TRCCNTRLDVRn(i));
+		etm4x_relaxed_write32(csa, config->cntr_ctrl[i], TRCCNTCTLRn(i));
+		etm4x_relaxed_write32(csa, config->cntr_val[i], TRCCNTVRn(i));
 	}
 
 	/*
@@ -166,52 +170,45 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
 	 * such start at 2.
 	 */
 	for (i = 2; i < drvdata->nr_resource * 2; i++)
-		writel_relaxed(config->res_ctrl[i],
-			       drvdata->base + TRCRSCTLRn(i));
+		etm4x_relaxed_write32(csa, config->res_ctrl[i], TRCRSCTLRn(i));
 
 	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
 		/* always clear status bit on restart if using single-shot */
 		if (config->ss_ctrl[i] || config->ss_pe_cmp[i])
 			config->ss_status[i] &= ~BIT(31);
-		writel_relaxed(config->ss_ctrl[i],
-			       drvdata->base + TRCSSCCRn(i));
-		writel_relaxed(config->ss_status[i],
-			       drvdata->base + TRCSSCSRn(i));
-		writel_relaxed(config->ss_pe_cmp[i],
-			       drvdata->base + TRCSSPCICRn(i));
+		etm4x_relaxed_write32(csa, config->ss_ctrl[i], TRCSSCCRn(i));
+		etm4x_relaxed_write32(csa, config->ss_status[i], TRCSSCSRn(i));
+		etm4x_relaxed_write32(csa, config->ss_pe_cmp[i], TRCSSPCICRn(i));
 	}
 	for (i = 0; i < drvdata->nr_addr_cmp; i++) {
-		writeq_relaxed(config->addr_val[i],
-			       drvdata->base + TRCACVRn(i));
-		writeq_relaxed(config->addr_acc[i],
-			       drvdata->base + TRCACATRn(i));
+		etm4x_relaxed_write64(csa, config->addr_val[i], TRCACVRn(i));
+		etm4x_relaxed_write64(csa, config->addr_acc[i], TRCACATRn(i));
 	}
 	for (i = 0; i < drvdata->numcidc; i++)
-		writeq_relaxed(config->ctxid_pid[i],
-			       drvdata->base + TRCCIDCVRn(i));
-	writel_relaxed(config->ctxid_mask0, drvdata->base + TRCCIDCCTLR0);
-	writel_relaxed(config->ctxid_mask1, drvdata->base + TRCCIDCCTLR1);
+		etm4x_relaxed_write64(csa, config->ctxid_pid[i], TRCCIDCVRn(i));
+	etm4x_relaxed_write32(csa, config->ctxid_mask0, TRCCIDCCTLR0);
+	etm4x_relaxed_write32(csa, config->ctxid_mask1, TRCCIDCCTLR1);
 
 	for (i = 0; i < drvdata->numvmidc; i++)
-		writeq_relaxed(config->vmid_val[i],
-			       drvdata->base + TRCVMIDCVRn(i));
-	writel_relaxed(config->vmid_mask0, drvdata->base + TRCVMIDCCTLR0);
-	writel_relaxed(config->vmid_mask1, drvdata->base + TRCVMIDCCTLR1);
+		etm4x_relaxed_write64(csa, config->vmid_val[i], TRCVMIDCVRn(i));
+	etm4x_relaxed_write32(csa, config->vmid_mask0, TRCVMIDCCTLR0);
+	etm4x_relaxed_write32(csa, config->vmid_mask1, TRCVMIDCCTLR1);
 
 	if (!drvdata->skip_power_up) {
+		u32 trcpdcr = etm4x_relaxed_read32(csa, TRCPDCR);
+
 		/*
 		 * Request to keep the trace unit powered and also
 		 * emulation of powerdown
 		 */
-		writel_relaxed(readl_relaxed(drvdata->base + TRCPDCR) |
-			       TRCPDCR_PU, drvdata->base + TRCPDCR);
+		etm4x_relaxed_write32(csa, trcpdcr | TRCPDCR_PU, TRCPDCR);
 	}
 
 	/* Enable the trace unit */
-	writel_relaxed(1, drvdata->base + TRCPRGCTLR);
+	etm4x_relaxed_write32(csa, 1, TRCPRGCTLR);
 
 	/* wait for TRCSTATR.IDLE to go back down to '0' */
-	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
+	if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
 		dev_err(etm_dev,
 			"timeout while waiting for Idle Trace Status\n");
 
@@ -477,18 +474,19 @@ static void etm4_disable_hw(void *info)
 	struct etmv4_config *config = &drvdata->config;
 	struct device *etm_dev = &drvdata->csdev->dev;
 	struct coresight_device *csdev = drvdata->csdev;
+	struct csdev_access *csa = &csdev->access;
 	int i;
 
-	CS_UNLOCK(&csdev->access);
+	CS_UNLOCK(csa);
 
 	if (!drvdata->skip_power_up) {
 		/* power can be removed from the trace unit now */
-		control = readl_relaxed(drvdata->base + TRCPDCR);
+		control = etm4x_relaxed_read32(csa, TRCPDCR);
 		control &= ~TRCPDCR_PU;
-		writel_relaxed(control, drvdata->base + TRCPDCR);
+		etm4x_relaxed_write32(csa, control, TRCPDCR);
 	}
 
-	control = readl_relaxed(drvdata->base + TRCPRGCTLR);
+	control = etm4x_relaxed_read32(csa, TRCPRGCTLR);
 
 	/* EN, bit[0] Trace unit enable bit */
 	control &= ~0x1;
@@ -500,7 +498,7 @@ static void etm4_disable_hw(void *info)
 	 */
 	dsb(sy);
 	isb();
-	writel_relaxed(control, drvdata->base + TRCPRGCTLR);
+	etm4x_relaxed_write32(csa, control, TRCPRGCTLR);
 
 	/* wait for TRCSTATR.PMSTABLE to go to '1' */
 	if (coresight_timeout(&csdev->access, TRCSTATR,
@@ -511,13 +509,13 @@ static void etm4_disable_hw(void *info)
 	/* read the status of the single shot comparators */
 	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
 		config->ss_status[i] =
-			readl_relaxed(drvdata->base + TRCSSCSRn(i));
+			etm4x_relaxed_read32(csa, TRCSSCSRn(i));
 	}
 
 	/* read back the current counter values */
 	for (i = 0; i < drvdata->nr_cntr; i++) {
 		config->cntr_val[i] =
-			readl_relaxed(drvdata->base + TRCCNTVRn(i));
+			etm4x_relaxed_read32(csa, TRCCNTVRn(i));
 	}
 
 	coresight_disclaim_device_unlocked(csdev);
@@ -546,7 +544,7 @@ static int etm4_disable_perf(struct coresight_device *csdev,
 	 * scheduled again.  Configuration of the start/stop logic happens in
 	 * function etm4_set_event_filters().
 	 */
-	control = readl_relaxed(drvdata->base + TRCVICTLR);
+	control = etm4x_relaxed_read32(&csdev->access, TRCVICTLR);
 	/* TRCVICTLR::SSSTATUS, bit[9] */
 	filters->ssstatus = (control & BIT(9));
 
@@ -641,12 +639,12 @@ static void etm4_init_arch_data(void *info)
 		return;
 
 	/* Make sure all registers are accessible */
-	etm4_os_unlock(drvdata);
+	etm4_os_unlock_csa(drvdata, csa);
 
 	CS_UNLOCK(csa);
 
 	/* find all capabilities of the tracing unit */
-	etmidr0 = readl_relaxed(drvdata->base + TRCIDR0);
+	etmidr0 = etm4x_relaxed_read32(csa, TRCIDR0);
 
 	/* INSTP0, bits[2:1] P0 tracing support field */
 	if (BMVAL(etmidr0, 1, 1) && BMVAL(etmidr0, 2, 2))
@@ -686,7 +684,7 @@ static void etm4_init_arch_data(void *info)
 	drvdata->ts_size = BMVAL(etmidr0, 24, 28);
 
 	/* base architecture of trace unit */
-	etmidr1 = readl_relaxed(drvdata->base + TRCIDR1);
+	etmidr1 = etm4x_relaxed_read32(csa, TRCIDR1);
 	/*
 	 * TRCARCHMIN, bits[7:4] architecture the minor version number
 	 * TRCARCHMAJ, bits[11:8] architecture major versin number
@@ -695,7 +693,7 @@ static void etm4_init_arch_data(void *info)
 	drvdata->config.arch = drvdata->arch;
 
 	/* maximum size of resources */
-	etmidr2 = readl_relaxed(drvdata->base + TRCIDR2);
+	etmidr2 = etm4x_relaxed_read32(csa, TRCIDR2);
 	/* CIDSIZE, bits[9:5] Indicates the Context ID size */
 	drvdata->ctxid_size = BMVAL(etmidr2, 5, 9);
 	/* VMIDSIZE, bits[14:10] Indicates the VMID size */
@@ -703,7 +701,7 @@ static void etm4_init_arch_data(void *info)
 	/* CCSIZE, bits[28:25] size of the cycle counter in bits minus 12 */
 	drvdata->ccsize = BMVAL(etmidr2, 25, 28);
 
-	etmidr3 = readl_relaxed(drvdata->base + TRCIDR3);
+	etmidr3 = etm4x_relaxed_read32(csa, TRCIDR3);
 	/* CCITMIN, bits[11:0] minimum threshold value that can be programmed */
 	drvdata->ccitmin = BMVAL(etmidr3, 0, 11);
 	/* EXLEVEL_S, bits[19:16] Secure state instruction tracing */
@@ -748,7 +746,7 @@ static void etm4_init_arch_data(void *info)
 		drvdata->nooverflow = false;
 
 	/* number of resources trace unit supports */
-	etmidr4 = readl_relaxed(drvdata->base + TRCIDR4);
+	etmidr4 = etm4x_relaxed_read32(csa, TRCIDR4);
 	/* NUMACPAIRS, bits[0:3] number of addr comparator pairs for tracing */
 	drvdata->nr_addr_cmp = BMVAL(etmidr4, 0, 3);
 	/* NUMPC, bits[15:12] number of PE comparator inputs for tracing */
@@ -768,14 +766,14 @@ static void etm4_init_arch_data(void *info)
 	drvdata->nr_ss_cmp = BMVAL(etmidr4, 20, 23);
 	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
 		drvdata->config.ss_status[i] =
-			readl_relaxed(drvdata->base + TRCSSCSRn(i));
+			etm4x_relaxed_read32(csa, TRCSSCSRn(i));
 	}
 	/* NUMCIDC, bits[27:24] number of Context ID comparators for tracing */
 	drvdata->numcidc = BMVAL(etmidr4, 24, 27);
 	/* NUMVMIDC, bits[31:28] number of VMID comparators for tracing */
 	drvdata->numvmidc = BMVAL(etmidr4, 28, 31);
 
-	etmidr5 = readl_relaxed(drvdata->base + TRCIDR5);
+	etmidr5 = etm4x_relaxed_read32(csa, TRCIDR5);
 	/* NUMEXTIN, bits[8:0] number of external inputs implemented */
 	drvdata->nr_ext_inp = BMVAL(etmidr5, 0, 8);
 	/* TRACEIDSIZE, bits[21:16] indicates the trace ID width */
@@ -1173,8 +1171,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 	etm4_os_lock(drvdata);
 
 	/* wait for TRCSTATR.PMSTABLE to go up */
-	if (coresight_timeout(&csdev->access, TRCSTATR,
-			      TRCSTATR_PMSTABLE_BIT, 1)) {
+	if (coresight_timeout(csa, TRCSTATR, TRCSTATR_PMSTABLE_BIT, 1)) {
 		dev_err(etm_dev,
 			"timeout while waiting for PM Stable Status\n");
 		etm4_os_unlock(drvdata);
@@ -1184,53 +1181,53 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 
 	state = drvdata->save_state;
 
-	state->trcprgctlr = readl(drvdata->base + TRCPRGCTLR);
-	state->trcprocselr = readl(drvdata->base + TRCPROCSELR);
-	state->trcconfigr = readl(drvdata->base + TRCCONFIGR);
-	state->trcauxctlr = readl(drvdata->base + TRCAUXCTLR);
-	state->trceventctl0r = readl(drvdata->base + TRCEVENTCTL0R);
-	state->trceventctl1r = readl(drvdata->base + TRCEVENTCTL1R);
-	state->trcstallctlr = readl(drvdata->base + TRCSTALLCTLR);
-	state->trctsctlr = readl(drvdata->base + TRCTSCTLR);
-	state->trcsyncpr = readl(drvdata->base + TRCSYNCPR);
-	state->trcccctlr = readl(drvdata->base + TRCCCCTLR);
-	state->trcbbctlr = readl(drvdata->base + TRCBBCTLR);
-	state->trctraceidr = readl(drvdata->base + TRCTRACEIDR);
-	state->trcqctlr = readl(drvdata->base + TRCQCTLR);
-
-	state->trcvictlr = readl(drvdata->base + TRCVICTLR);
-	state->trcviiectlr = readl(drvdata->base + TRCVIIECTLR);
-	state->trcvissctlr = readl(drvdata->base + TRCVISSCTLR);
-	state->trcvipcssctlr = readl(drvdata->base + TRCVIPCSSCTLR);
-	state->trcvdctlr = readl(drvdata->base + TRCVDCTLR);
-	state->trcvdsacctlr = readl(drvdata->base + TRCVDSACCTLR);
-	state->trcvdarcctlr = readl(drvdata->base + TRCVDARCCTLR);
+	state->trcprgctlr = etm4x_read32(csa, TRCPRGCTLR);
+	state->trcprocselr = etm4x_read32(csa, TRCPROCSELR);
+	state->trcconfigr = etm4x_read32(csa, TRCCONFIGR);
+	state->trcauxctlr = etm4x_read32(csa, TRCAUXCTLR);
+	state->trceventctl0r = etm4x_read32(csa, TRCEVENTCTL0R);
+	state->trceventctl1r = etm4x_read32(csa, TRCEVENTCTL1R);
+	state->trcstallctlr = etm4x_read32(csa, TRCSTALLCTLR);
+	state->trctsctlr = etm4x_read32(csa, TRCTSCTLR);
+	state->trcsyncpr = etm4x_read32(csa, TRCSYNCPR);
+	state->trcccctlr = etm4x_read32(csa, TRCCCCTLR);
+	state->trcbbctlr = etm4x_read32(csa, TRCBBCTLR);
+	state->trctraceidr = etm4x_read32(csa, TRCTRACEIDR);
+	state->trcqctlr = etm4x_read32(csa, TRCQCTLR);
+
+	state->trcvictlr = etm4x_read32(csa, TRCVICTLR);
+	state->trcviiectlr = etm4x_read32(csa, TRCVIIECTLR);
+	state->trcvissctlr = etm4x_read32(csa, TRCVISSCTLR);
+	state->trcvipcssctlr = etm4x_read32(csa, TRCVIPCSSCTLR);
+	state->trcvdctlr = etm4x_read32(csa, TRCVDCTLR);
+	state->trcvdsacctlr = etm4x_read32(csa, TRCVDSACCTLR);
+	state->trcvdarcctlr = etm4x_read32(csa, TRCVDARCCTLR);
 
 	for (i = 0; i < drvdata->nrseqstate; i++)
-		state->trcseqevr[i] = readl(drvdata->base + TRCSEQEVRn(i));
+		state->trcseqevr[i] = etm4x_read32(csa, TRCSEQEVRn(i));
 
-	state->trcseqrstevr = readl(drvdata->base + TRCSEQRSTEVR);
-	state->trcseqstr = readl(drvdata->base + TRCSEQSTR);
-	state->trcextinselr = readl(drvdata->base + TRCEXTINSELR);
+	state->trcseqrstevr = etm4x_read32(csa, TRCSEQRSTEVR);
+	state->trcseqstr = etm4x_read32(csa, TRCSEQSTR);
+	state->trcextinselr = etm4x_read32(csa, TRCEXTINSELR);
 
 	for (i = 0; i < drvdata->nr_cntr; i++) {
-		state->trccntrldvr[i] = readl(drvdata->base + TRCCNTRLDVRn(i));
-		state->trccntctlr[i] = readl(drvdata->base + TRCCNTCTLRn(i));
-		state->trccntvr[i] = readl(drvdata->base + TRCCNTVRn(i));
+		state->trccntrldvr[i] = etm4x_read32(csa, TRCCNTRLDVRn(i));
+		state->trccntctlr[i] = etm4x_read32(csa, TRCCNTCTLRn(i));
+		state->trccntvr[i] = etm4x_read32(csa, TRCCNTVRn(i));
 	}
 
 	for (i = 0; i < drvdata->nr_resource * 2; i++)
-		state->trcrsctlr[i] = readl(drvdata->base + TRCRSCTLRn(i));
+		state->trcrsctlr[i] = etm4x_read32(csa, TRCRSCTLRn(i));
 
 	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
-		state->trcssccr[i] = readl(drvdata->base + TRCSSCCRn(i));
-		state->trcsscsr[i] = readl(drvdata->base + TRCSSCSRn(i));
-		state->trcsspcicr[i] = readl(drvdata->base + TRCSSPCICRn(i));
+		state->trcssccr[i] = etm4x_read32(csa, TRCSSCCRn(i));
+		state->trcsscsr[i] = etm4x_read32(csa, TRCSSCSRn(i));
+		state->trcsspcicr[i] = etm4x_read32(csa, TRCSSPCICRn(i));
 	}
 
 	for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) {
-		state->trcacvr[i] = readq(drvdata->base + TRCACVRn(i));
-		state->trcacatr[i] = readq(drvdata->base + TRCACATRn(i));
+		state->trcacvr[i] = etm4x_read64(csa, TRCACVRn(i));
+		state->trcacatr[i] = etm4x_read64(csa, TRCACATRn(i));
 	}
 
 	/*
@@ -1241,23 +1238,23 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 	 */
 
 	for (i = 0; i < drvdata->numcidc; i++)
-		state->trccidcvr[i] = readq(drvdata->base + TRCCIDCVRn(i));
+		state->trccidcvr[i] = etm4x_read64(csa, TRCCIDCVRn(i));
 
 	for (i = 0; i < drvdata->numvmidc; i++)
-		state->trcvmidcvr[i] = readq(drvdata->base + TRCVMIDCVRn(i));
+		state->trcvmidcvr[i] = etm4x_read64(csa, TRCVMIDCVRn(i));
 
-	state->trccidcctlr0 = readl(drvdata->base + TRCCIDCCTLR0);
-	state->trccidcctlr1 = readl(drvdata->base + TRCCIDCCTLR1);
+	state->trccidcctlr0 = etm4x_read32(csa, TRCCIDCCTLR0);
+	state->trccidcctlr1 = etm4x_read32(csa, TRCCIDCCTLR1);
 
-	state->trcvmidcctlr0 = readl(drvdata->base + TRCVMIDCCTLR0);
-	state->trcvmidcctlr0 = readl(drvdata->base + TRCVMIDCCTLR1);
+	state->trcvmidcctlr0 = etm4x_read32(csa, TRCVMIDCCTLR0);
+	state->trcvmidcctlr0 = etm4x_read32(csa, TRCVMIDCCTLR1);
 
-	state->trcclaimset = readl(drvdata->base + TRCCLAIMCLR);
+	state->trcclaimset = etm4x_read32(csa, TRCCLAIMCLR);
 
-	state->trcpdcr = readl(drvdata->base + TRCPDCR);
+	state->trcpdcr = etm4x_read32(csa, TRCPDCR);
 
 	/* wait for TRCSTATR.IDLE to go up */
-	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
+	if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
 		dev_err(etm_dev,
 			"timeout while waiting for Idle Trace Status\n");
 		etm4_os_unlock(drvdata);
@@ -1272,8 +1269,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
 	 * potentially save power on systems that respect the TRCPDCR_PU
 	 * despite requesting software to save/restore state.
 	 */
-	writel_relaxed((state->trcpdcr & ~TRCPDCR_PU),
-			drvdata->base + TRCPDCR);
+	etm4x_relaxed_write32(csa, (state->trcpdcr & ~TRCPDCR_PU), TRCPDCR);
 
 out:
 	CS_LOCK(csa);
@@ -1293,84 +1289,72 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
 	csa = &csdev->access;
 	CS_UNLOCK(csa);
 
-	writel_relaxed(state->trcclaimset, drvdata->base + TRCCLAIMSET);
-
-	writel_relaxed(state->trcprgctlr, drvdata->base + TRCPRGCTLR);
-	writel_relaxed(state->trcprocselr, drvdata->base + TRCPROCSELR);
-	writel_relaxed(state->trcconfigr, drvdata->base + TRCCONFIGR);
-	writel_relaxed(state->trcauxctlr, drvdata->base + TRCAUXCTLR);
-	writel_relaxed(state->trceventctl0r, drvdata->base + TRCEVENTCTL0R);
-	writel_relaxed(state->trceventctl1r, drvdata->base + TRCEVENTCTL1R);
-	writel_relaxed(state->trcstallctlr, drvdata->base + TRCSTALLCTLR);
-	writel_relaxed(state->trctsctlr, drvdata->base + TRCTSCTLR);
-	writel_relaxed(state->trcsyncpr, drvdata->base + TRCSYNCPR);
-	writel_relaxed(state->trcccctlr, drvdata->base + TRCCCCTLR);
-	writel_relaxed(state->trcbbctlr, drvdata->base + TRCBBCTLR);
-	writel_relaxed(state->trctraceidr, drvdata->base + TRCTRACEIDR);
-	writel_relaxed(state->trcqctlr, drvdata->base + TRCQCTLR);
-
-	writel_relaxed(state->trcvictlr, drvdata->base + TRCVICTLR);
-	writel_relaxed(state->trcviiectlr, drvdata->base + TRCVIIECTLR);
-	writel_relaxed(state->trcvissctlr, drvdata->base + TRCVISSCTLR);
-	writel_relaxed(state->trcvipcssctlr, drvdata->base + TRCVIPCSSCTLR);
-	writel_relaxed(state->trcvdctlr, drvdata->base + TRCVDCTLR);
-	writel_relaxed(state->trcvdsacctlr, drvdata->base + TRCVDSACCTLR);
-	writel_relaxed(state->trcvdarcctlr, drvdata->base + TRCVDARCCTLR);
+	etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET);
+
+	etm4x_relaxed_write32(csa, state->trcprgctlr, TRCPRGCTLR);
+	etm4x_relaxed_write32(csa, state->trcprocselr, TRCPROCSELR);
+	etm4x_relaxed_write32(csa, state->trcconfigr, TRCCONFIGR);
+	etm4x_relaxed_write32(csa, state->trcauxctlr, TRCAUXCTLR);
+	etm4x_relaxed_write32(csa, state->trceventctl0r, TRCEVENTCTL0R);
+	etm4x_relaxed_write32(csa, state->trceventctl1r, TRCEVENTCTL1R);
+	etm4x_relaxed_write32(csa, state->trcstallctlr, TRCSTALLCTLR);
+	etm4x_relaxed_write32(csa, state->trctsctlr, TRCTSCTLR);
+	etm4x_relaxed_write32(csa, state->trcsyncpr, TRCSYNCPR);
+	etm4x_relaxed_write32(csa, state->trcccctlr, TRCCCCTLR);
+	etm4x_relaxed_write32(csa, state->trcbbctlr, TRCBBCTLR);
+	etm4x_relaxed_write32(csa, state->trctraceidr, TRCTRACEIDR);
+	etm4x_relaxed_write32(csa, state->trcqctlr, TRCQCTLR);
+
+	etm4x_relaxed_write32(csa, state->trcvictlr, TRCVICTLR);
+	etm4x_relaxed_write32(csa, state->trcviiectlr, TRCVIIECTLR);
+	etm4x_relaxed_write32(csa, state->trcvissctlr, TRCVISSCTLR);
+	etm4x_relaxed_write32(csa, state->trcvipcssctlr, TRCVIPCSSCTLR);
+	etm4x_relaxed_write32(csa, state->trcvdctlr, TRCVDCTLR);
+	etm4x_relaxed_write32(csa, state->trcvdsacctlr, TRCVDSACCTLR);
+	etm4x_relaxed_write32(csa, state->trcvdarcctlr, TRCVDARCCTLR);
 
 	for (i = 0; i < drvdata->nrseqstate; i++)
-		writel_relaxed(state->trcseqevr[i],
-			       drvdata->base + TRCSEQEVRn(i));
+		etm4x_relaxed_write32(csa, state->trcseqevr[i], TRCSEQEVRn(i));
 
-	writel_relaxed(state->trcseqrstevr, drvdata->base + TRCSEQRSTEVR);
-	writel_relaxed(state->trcseqstr, drvdata->base + TRCSEQSTR);
-	writel_relaxed(state->trcextinselr, drvdata->base + TRCEXTINSELR);
+	etm4x_relaxed_write32(csa, state->trcseqrstevr, TRCSEQRSTEVR);
+	etm4x_relaxed_write32(csa, state->trcseqstr, TRCSEQSTR);
+	etm4x_relaxed_write32(csa, state->trcextinselr, TRCEXTINSELR);
 
 	for (i = 0; i < drvdata->nr_cntr; i++) {
-		writel_relaxed(state->trccntrldvr[i],
-			       drvdata->base + TRCCNTRLDVRn(i));
-		writel_relaxed(state->trccntctlr[i],
-			       drvdata->base + TRCCNTCTLRn(i));
-		writel_relaxed(state->trccntvr[i],
-			       drvdata->base + TRCCNTVRn(i));
+		etm4x_relaxed_write32(csa, state->trccntrldvr[i], TRCCNTRLDVRn(i));
+		etm4x_relaxed_write32(csa, state->trccntctlr[i], TRCCNTCTLRn(i));
+		etm4x_relaxed_write32(csa, state->trccntvr[i], TRCCNTVRn(i));
 	}
 
 	for (i = 0; i < drvdata->nr_resource * 2; i++)
-		writel_relaxed(state->trcrsctlr[i],
-			       drvdata->base + TRCRSCTLRn(i));
+		etm4x_relaxed_write32(csa, state->trcrsctlr[i], TRCRSCTLRn(i));
 
 	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
-		writel_relaxed(state->trcssccr[i],
-			       drvdata->base + TRCSSCCRn(i));
-		writel_relaxed(state->trcsscsr[i],
-			       drvdata->base + TRCSSCSRn(i));
-		writel_relaxed(state->trcsspcicr[i],
-			       drvdata->base + TRCSSPCICRn(i));
+		etm4x_relaxed_write32(csa, state->trcssccr[i], TRCSSCCRn(i));
+		etm4x_relaxed_write32(csa, state->trcsscsr[i], TRCSSCSRn(i));
+		etm4x_relaxed_write32(csa, state->trcsspcicr[i], TRCSSPCICRn(i));
 	}
 
 	for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) {
-		writeq_relaxed(state->trcacvr[i],
-			       drvdata->base + TRCACVRn(i));
-		writeq_relaxed(state->trcacatr[i],
-			       drvdata->base + TRCACATRn(i));
+		etm4x_relaxed_write64(csa, state->trcacvr[i], TRCACVRn(i));
+		etm4x_relaxed_write64(csa, state->trcacatr[i], TRCACATRn(i));
 	}
 
 	for (i = 0; i < drvdata->numcidc; i++)
-		writeq_relaxed(state->trccidcvr[i],
-			       drvdata->base + TRCCIDCVRn(i));
+		etm4x_relaxed_write64(csa, state->trccidcvr[i], TRCCIDCVRn(i));
 
 	for (i = 0; i < drvdata->numvmidc; i++)
-		writeq_relaxed(state->trcvmidcvr[i],
-			       drvdata->base + TRCVMIDCVRn(i));
+		etm4x_relaxed_write64(csa, state->trcvmidcvr[i], TRCVMIDCVRn(i));
 
-	writel_relaxed(state->trccidcctlr0, drvdata->base + TRCCIDCCTLR0);
-	writel_relaxed(state->trccidcctlr1, drvdata->base + TRCCIDCCTLR1);
+	etm4x_relaxed_write32(csa, state->trccidcctlr0, TRCCIDCCTLR0);
+	etm4x_relaxed_write32(csa, state->trccidcctlr1, TRCCIDCCTLR1);
 
-	writel_relaxed(state->trcvmidcctlr0, drvdata->base + TRCVMIDCCTLR0);
-	writel_relaxed(state->trcvmidcctlr0, drvdata->base + TRCVMIDCCTLR1);
+	etm4x_relaxed_write32(csa, state->trcvmidcctlr0, TRCVMIDCCTLR0);
+	etm4x_relaxed_write32(csa, state->trcvmidcctlr0, TRCVMIDCCTLR1);
 
-	writel_relaxed(state->trcclaimset, drvdata->base + TRCCLAIMSET);
+	etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET);
 
-	writel_relaxed(state->trcpdcr, drvdata->base + TRCPDCR);
+	etm4x_relaxed_write32(csa, state->trcpdcr, TRCPDCR);
 
 	drvdata->state_needs_restore = false;
 
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index b8283e1d6d88..2b51d03ab6d7 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -120,6 +120,30 @@
 #define TRCCIDR2			0xFF8
 #define TRCCIDR3			0xFFC
 
+#define etm4x_relaxed_read32(csa, offset)		\
+	readl_relaxed((csa)->base + (offset))
+
+#define etm4x_read32(csa, offset)			\
+	readl((csa)->base + (offset))
+
+#define etm4x_relaxed_write32(csa, val, offset)		\
+	writel_relaxed((val), (csa)->base + (offset))
+
+#define etm4x_write32(csa, val, offset)			\
+	writel((val), (csa)->base + (offset))
+
+#define etm4x_relaxed_read64(csa, offset)		\
+	readq_relaxed((csa)->base + (offset))
+
+#define etm4x_read64(csa, offset)			\
+	readq((csa)->base + (offset))
+
+#define etm4x_relaxed_write64(csa, val, offset)		\
+	writeq_relaxed((val), (csa)->base + (offset))
+
+#define etm4x_write64(csa, val, offset)			\
+	writeq((val), (csa)->base + (offset))
+
 /* ETMv4 resources */
 #define ETM_MAX_NR_PE			8
 #define ETMv4_MAX_CNTR			4
-- 
2.24.1


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linux-arm-kernel@lists.infradead.org
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Re: [RFC PATCH 08/14] coresight: etm4x: Convert all register accesses

[Mathieu Poirier]

On Wed, Jul 22, 2020 at 06:20:34PM +0100, Suzuki K Poulose wrote:
> Convert all register accesses from etm4x driver to use a wrapper
> to allow switching the access at runtime with little overhead.
> 
> co-developed by sed tool ;-), mostly equivalent to :
> 
> s/readl\(_relaxed\)\?(drvdata->base + \(.*\))/etm4x_\1_read32(csdev, \2)
> s/writel\(_relaxed\)\?(\(.*\), drvdata->base + \(.*\))/etm4x_\1_write32(csdev, \2, \3)
> 
> We don't want to replace them with the csdev_access_* to
> avoid a function call for every register access for system
> register access.
> 
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  .../coresight/coresight-etm4x-sysfs.c         |   9 +-
>  drivers/hwtracing/coresight/coresight-etm4x.c | 334 +++++++++---------
>  drivers/hwtracing/coresight/coresight-etm4x.h |  24 ++
>  3 files changed, 189 insertions(+), 178 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> index 90c75ba31a0c..fe40355f6a2c 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> @@ -2316,7 +2316,8 @@ static struct attribute *coresight_etmv4_attrs[] = {
>  };
>  
>  struct etmv4_reg {
> -	void __iomem *addr;
> +	struct coresight_device *csdev;
> +	u32 offset;
>  	u32 data;
>  };
>  
> @@ -2324,7 +2325,7 @@ static void do_smp_cross_read(void *data)
>  {
>  	struct etmv4_reg *reg = data;
>  
> -	reg->data = readl_relaxed(reg->addr);
> +	reg->data = etm4x_relaxed_read32(&reg->csdev->access, reg->offset);
>  }
>  
>  static u32 etmv4_cross_read(const struct device *dev, u32 offset)
> @@ -2332,7 +2333,9 @@ static u32 etmv4_cross_read(const struct device *dev, u32 offset)
>  	struct etmv4_drvdata *drvdata = dev_get_drvdata(dev);
>  	struct etmv4_reg reg;
>  
> -	reg.addr = drvdata->base + offset;
> +	reg.offset = offset;
> +	reg.csdev = drvdata->csdev;
> +
>  	/*
>  	 * smp cross call ensures the CPU will be powered up before
>  	 * accessing the ETMv4 trace core registers
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index ce32d4ebc8b9..b901c91d3ee4 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -57,18 +57,28 @@ static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
>  
>  static enum cpuhp_state hp_online;
>  
> -static void etm4_os_unlock(struct etmv4_drvdata *drvdata)
> +static void etm4_os_unlock_csa(struct etmv4_drvdata *drvdata, struct csdev_access *csa)
>  {
>  	/* Writing 0 to TRCOSLAR unlocks the trace registers */
> -	writel_relaxed(0x0, drvdata->base + TRCOSLAR);
> +	etm4x_relaxed_write32(csa, 0x0, TRCOSLAR);
>  	drvdata->os_unlock = true;
>  	isb();
>  }
>  
> +static void etm4_os_unlock(struct etmv4_drvdata *drvdata)
> +{
> +	if (!WARN_ON(!drvdata->csdev))
> +		etm4_os_unlock_csa(drvdata, &drvdata->csdev->access);
> +
> +}
> +
>  static void etm4_os_lock(struct etmv4_drvdata *drvdata)
>  {
> +	if (WARN_ON(!drvdata->csdev))
> +		return;
> +
>  	/* Writing 0x1 to TRCOSLAR locks the trace registers */
> -	writel_relaxed(0x1, drvdata->base + TRCOSLAR);
> +	etm4x_relaxed_write32(&drvdata->csdev->access, 0x1, TRCOSLAR);
>  	drvdata->os_unlock = false;
>  	isb();
>  }
> @@ -121,44 +131,38 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
>  		goto done;
>  
>  	/* Disable the trace unit before programming trace registers */
> -	writel_relaxed(0, drvdata->base + TRCPRGCTLR);
> +	etm4x_relaxed_write32(csa, 0, TRCPRGCTLR);
>  
>  	/* wait for TRCSTATR.IDLE to go up */
>  	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
>  		dev_err(etm_dev,
>  			"timeout while waiting for Idle Trace Status\n");
>  
> -	writel_relaxed(config->pe_sel, drvdata->base + TRCPROCSELR);
> -	writel_relaxed(config->cfg, drvdata->base + TRCCONFIGR);
> +	etm4x_relaxed_write32(csa, config->pe_sel, TRCPROCSELR);
> +	etm4x_relaxed_write32(csa, config->cfg, TRCCONFIGR);
>  	/* nothing specific implemented */
> -	writel_relaxed(0x0, drvdata->base + TRCAUXCTLR);
> -	writel_relaxed(config->eventctrl0, drvdata->base + TRCEVENTCTL0R);
> -	writel_relaxed(config->eventctrl1, drvdata->base + TRCEVENTCTL1R);
> -	writel_relaxed(config->stall_ctrl, drvdata->base + TRCSTALLCTLR);
> -	writel_relaxed(config->ts_ctrl, drvdata->base + TRCTSCTLR);
> -	writel_relaxed(config->syncfreq, drvdata->base + TRCSYNCPR);
> -	writel_relaxed(config->ccctlr, drvdata->base + TRCCCCTLR);
> -	writel_relaxed(config->bb_ctrl, drvdata->base + TRCBBCTLR);
> -	writel_relaxed(drvdata->trcid, drvdata->base + TRCTRACEIDR);
> -	writel_relaxed(config->vinst_ctrl, drvdata->base + TRCVICTLR);
> -	writel_relaxed(config->viiectlr, drvdata->base + TRCVIIECTLR);
> -	writel_relaxed(config->vissctlr,
> -		       drvdata->base + TRCVISSCTLR);
> -	writel_relaxed(config->vipcssctlr,
> -		       drvdata->base + TRCVIPCSSCTLR);
> +	etm4x_relaxed_write32(csa, 0x0, TRCAUXCTLR);
> +	etm4x_relaxed_write32(csa, config->eventctrl0, TRCEVENTCTL0R);
> +	etm4x_relaxed_write32(csa, config->eventctrl1, TRCEVENTCTL1R);
> +	etm4x_relaxed_write32(csa, config->stall_ctrl, TRCSTALLCTLR);
> +	etm4x_relaxed_write32(csa, config->ts_ctrl, TRCTSCTLR);
> +	etm4x_relaxed_write32(csa, config->syncfreq, TRCSYNCPR);
> +	etm4x_relaxed_write32(csa, config->ccctlr, TRCCCCTLR);
> +	etm4x_relaxed_write32(csa, config->bb_ctrl, TRCBBCTLR);
> +	etm4x_relaxed_write32(csa, drvdata->trcid, TRCTRACEIDR);
> +	etm4x_relaxed_write32(csa, config->vinst_ctrl, TRCVICTLR);
> +	etm4x_relaxed_write32(csa, config->viiectlr, TRCVIIECTLR);
> +	etm4x_relaxed_write32(csa, config->vissctlr, TRCVISSCTLR);
> +	etm4x_relaxed_write32(csa, config->vipcssctlr, TRCVIPCSSCTLR);
>  	for (i = 0; i < drvdata->nrseqstate - 1; i++)
> -		writel_relaxed(config->seq_ctrl[i],
> -			       drvdata->base + TRCSEQEVRn(i));
> -	writel_relaxed(config->seq_rst, drvdata->base + TRCSEQRSTEVR);
> -	writel_relaxed(config->seq_state, drvdata->base + TRCSEQSTR);
> -	writel_relaxed(config->ext_inp, drvdata->base + TRCEXTINSELR);
> +		etm4x_relaxed_write32(csa, config->seq_ctrl[i], TRCSEQEVRn(i));
> +	etm4x_relaxed_write32(csa, config->seq_rst, TRCSEQRSTEVR);
> +	etm4x_relaxed_write32(csa, config->seq_state, TRCSEQSTR);
> +	etm4x_relaxed_write32(csa, config->ext_inp, TRCEXTINSELR);
>  	for (i = 0; i < drvdata->nr_cntr; i++) {
> -		writel_relaxed(config->cntrldvr[i],
> -			       drvdata->base + TRCCNTRLDVRn(i));
> -		writel_relaxed(config->cntr_ctrl[i],
> -			       drvdata->base + TRCCNTCTLRn(i));
> -		writel_relaxed(config->cntr_val[i],
> -			       drvdata->base + TRCCNTVRn(i));
> +		etm4x_relaxed_write32(csa, config->cntrldvr[i], TRCCNTRLDVRn(i));
> +		etm4x_relaxed_write32(csa, config->cntr_ctrl[i], TRCCNTCTLRn(i));
> +		etm4x_relaxed_write32(csa, config->cntr_val[i], TRCCNTVRn(i));
>  	}
>  
>  	/*
> @@ -166,52 +170,45 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
>  	 * such start at 2.
>  	 */
>  	for (i = 2; i < drvdata->nr_resource * 2; i++)
> -		writel_relaxed(config->res_ctrl[i],
> -			       drvdata->base + TRCRSCTLRn(i));
> +		etm4x_relaxed_write32(csa, config->res_ctrl[i], TRCRSCTLRn(i));
>  
>  	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
>  		/* always clear status bit on restart if using single-shot */
>  		if (config->ss_ctrl[i] || config->ss_pe_cmp[i])
>  			config->ss_status[i] &= ~BIT(31);
> -		writel_relaxed(config->ss_ctrl[i],
> -			       drvdata->base + TRCSSCCRn(i));
> -		writel_relaxed(config->ss_status[i],
> -			       drvdata->base + TRCSSCSRn(i));
> -		writel_relaxed(config->ss_pe_cmp[i],
> -			       drvdata->base + TRCSSPCICRn(i));
> +		etm4x_relaxed_write32(csa, config->ss_ctrl[i], TRCSSCCRn(i));
> +		etm4x_relaxed_write32(csa, config->ss_status[i], TRCSSCSRn(i));
> +		etm4x_relaxed_write32(csa, config->ss_pe_cmp[i], TRCSSPCICRn(i));
>  	}
>  	for (i = 0; i < drvdata->nr_addr_cmp; i++) {
> -		writeq_relaxed(config->addr_val[i],
> -			       drvdata->base + TRCACVRn(i));
> -		writeq_relaxed(config->addr_acc[i],
> -			       drvdata->base + TRCACATRn(i));
> +		etm4x_relaxed_write64(csa, config->addr_val[i], TRCACVRn(i));
> +		etm4x_relaxed_write64(csa, config->addr_acc[i], TRCACATRn(i));
>  	}
>  	for (i = 0; i < drvdata->numcidc; i++)
> -		writeq_relaxed(config->ctxid_pid[i],
> -			       drvdata->base + TRCCIDCVRn(i));
> -	writel_relaxed(config->ctxid_mask0, drvdata->base + TRCCIDCCTLR0);
> -	writel_relaxed(config->ctxid_mask1, drvdata->base + TRCCIDCCTLR1);
> +		etm4x_relaxed_write64(csa, config->ctxid_pid[i], TRCCIDCVRn(i));
> +	etm4x_relaxed_write32(csa, config->ctxid_mask0, TRCCIDCCTLR0);
> +	etm4x_relaxed_write32(csa, config->ctxid_mask1, TRCCIDCCTLR1);
>  
>  	for (i = 0; i < drvdata->numvmidc; i++)
> -		writeq_relaxed(config->vmid_val[i],
> -			       drvdata->base + TRCVMIDCVRn(i));
> -	writel_relaxed(config->vmid_mask0, drvdata->base + TRCVMIDCCTLR0);
> -	writel_relaxed(config->vmid_mask1, drvdata->base + TRCVMIDCCTLR1);
> +		etm4x_relaxed_write64(csa, config->vmid_val[i], TRCVMIDCVRn(i));
> +	etm4x_relaxed_write32(csa, config->vmid_mask0, TRCVMIDCCTLR0);
> +	etm4x_relaxed_write32(csa, config->vmid_mask1, TRCVMIDCCTLR1);
>  
>  	if (!drvdata->skip_power_up) {
> +		u32 trcpdcr = etm4x_relaxed_read32(csa, TRCPDCR);
> +
>  		/*
>  		 * Request to keep the trace unit powered and also
>  		 * emulation of powerdown
>  		 */
> -		writel_relaxed(readl_relaxed(drvdata->base + TRCPDCR) |
> -			       TRCPDCR_PU, drvdata->base + TRCPDCR);
> +		etm4x_relaxed_write32(csa, trcpdcr | TRCPDCR_PU, TRCPDCR);
>  	}
>  
>  	/* Enable the trace unit */
> -	writel_relaxed(1, drvdata->base + TRCPRGCTLR);
> +	etm4x_relaxed_write32(csa, 1, TRCPRGCTLR);
>  
>  	/* wait for TRCSTATR.IDLE to go back down to '0' */
> -	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
> +	if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 0))

Please avoid doing that.  Change it once in 06/14 and don't touch after that.
Moreover it creates an imbalance because the other coresight_timeout() in the
same function still uses csdev->access.  There are other instances of changes
like this in the file that need to be addressed.

>  		dev_err(etm_dev,
>  			"timeout while waiting for Idle Trace Status\n");
>  
> @@ -477,18 +474,19 @@ static void etm4_disable_hw(void *info)
>  	struct etmv4_config *config = &drvdata->config;
>  	struct device *etm_dev = &drvdata->csdev->dev;
>  	struct coresight_device *csdev = drvdata->csdev;
> +	struct csdev_access *csa = &csdev->access;
>  	int i;
>  
> -	CS_UNLOCK(&csdev->access);
> +	CS_UNLOCK(csa);

Same here.

>  
>  	if (!drvdata->skip_power_up) {
>  		/* power can be removed from the trace unit now */
> -		control = readl_relaxed(drvdata->base + TRCPDCR);
> +		control = etm4x_relaxed_read32(csa, TRCPDCR);
>  		control &= ~TRCPDCR_PU;
> -		writel_relaxed(control, drvdata->base + TRCPDCR);
> +		etm4x_relaxed_write32(csa, control, TRCPDCR);
>  	}
>  
> -	control = readl_relaxed(drvdata->base + TRCPRGCTLR);
> +	control = etm4x_relaxed_read32(csa, TRCPRGCTLR);
>  
>  	/* EN, bit[0] Trace unit enable bit */
>  	control &= ~0x1;
> @@ -500,7 +498,7 @@ static void etm4_disable_hw(void *info)
>  	 */
>  	dsb(sy);
>  	isb();
> -	writel_relaxed(control, drvdata->base + TRCPRGCTLR);
> +	etm4x_relaxed_write32(csa, control, TRCPRGCTLR);
>  
>  	/* wait for TRCSTATR.PMSTABLE to go to '1' */
>  	if (coresight_timeout(&csdev->access, TRCSTATR,
> @@ -511,13 +509,13 @@ static void etm4_disable_hw(void *info)
>  	/* read the status of the single shot comparators */
>  	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
>  		config->ss_status[i] =
> -			readl_relaxed(drvdata->base + TRCSSCSRn(i));
> +			etm4x_relaxed_read32(csa, TRCSSCSRn(i));
>  	}
>  
>  	/* read back the current counter values */
>  	for (i = 0; i < drvdata->nr_cntr; i++) {
>  		config->cntr_val[i] =
> -			readl_relaxed(drvdata->base + TRCCNTVRn(i));
> +			etm4x_relaxed_read32(csa, TRCCNTVRn(i));
>  	}
>  
>  	coresight_disclaim_device_unlocked(csdev);
> @@ -546,7 +544,7 @@ static int etm4_disable_perf(struct coresight_device *csdev,
>  	 * scheduled again.  Configuration of the start/stop logic happens in
>  	 * function etm4_set_event_filters().
>  	 */
> -	control = readl_relaxed(drvdata->base + TRCVICTLR);
> +	control = etm4x_relaxed_read32(&csdev->access, TRCVICTLR);
>  	/* TRCVICTLR::SSSTATUS, bit[9] */
>  	filters->ssstatus = (control & BIT(9));
>  
> @@ -641,12 +639,12 @@ static void etm4_init_arch_data(void *info)
>  		return;
>  
>  	/* Make sure all registers are accessible */
> -	etm4_os_unlock(drvdata);
> +	etm4_os_unlock_csa(drvdata, csa);
>  
>  	CS_UNLOCK(csa);
>  
>  	/* find all capabilities of the tracing unit */
> -	etmidr0 = readl_relaxed(drvdata->base + TRCIDR0);
> +	etmidr0 = etm4x_relaxed_read32(csa, TRCIDR0);
>  
>  	/* INSTP0, bits[2:1] P0 tracing support field */
>  	if (BMVAL(etmidr0, 1, 1) && BMVAL(etmidr0, 2, 2))
> @@ -686,7 +684,7 @@ static void etm4_init_arch_data(void *info)
>  	drvdata->ts_size = BMVAL(etmidr0, 24, 28);
>  
>  	/* base architecture of trace unit */
> -	etmidr1 = readl_relaxed(drvdata->base + TRCIDR1);
> +	etmidr1 = etm4x_relaxed_read32(csa, TRCIDR1);
>  	/*
>  	 * TRCARCHMIN, bits[7:4] architecture the minor version number
>  	 * TRCARCHMAJ, bits[11:8] architecture major versin number
> @@ -695,7 +693,7 @@ static void etm4_init_arch_data(void *info)
>  	drvdata->config.arch = drvdata->arch;
>  
>  	/* maximum size of resources */
> -	etmidr2 = readl_relaxed(drvdata->base + TRCIDR2);
> +	etmidr2 = etm4x_relaxed_read32(csa, TRCIDR2);
>  	/* CIDSIZE, bits[9:5] Indicates the Context ID size */
>  	drvdata->ctxid_size = BMVAL(etmidr2, 5, 9);
>  	/* VMIDSIZE, bits[14:10] Indicates the VMID size */
> @@ -703,7 +701,7 @@ static void etm4_init_arch_data(void *info)
>  	/* CCSIZE, bits[28:25] size of the cycle counter in bits minus 12 */
>  	drvdata->ccsize = BMVAL(etmidr2, 25, 28);
>  
> -	etmidr3 = readl_relaxed(drvdata->base + TRCIDR3);
> +	etmidr3 = etm4x_relaxed_read32(csa, TRCIDR3);
>  	/* CCITMIN, bits[11:0] minimum threshold value that can be programmed */
>  	drvdata->ccitmin = BMVAL(etmidr3, 0, 11);
>  	/* EXLEVEL_S, bits[19:16] Secure state instruction tracing */
> @@ -748,7 +746,7 @@ static void etm4_init_arch_data(void *info)
>  		drvdata->nooverflow = false;
>  
>  	/* number of resources trace unit supports */
> -	etmidr4 = readl_relaxed(drvdata->base + TRCIDR4);
> +	etmidr4 = etm4x_relaxed_read32(csa, TRCIDR4);
>  	/* NUMACPAIRS, bits[0:3] number of addr comparator pairs for tracing */
>  	drvdata->nr_addr_cmp = BMVAL(etmidr4, 0, 3);
>  	/* NUMPC, bits[15:12] number of PE comparator inputs for tracing */
> @@ -768,14 +766,14 @@ static void etm4_init_arch_data(void *info)
>  	drvdata->nr_ss_cmp = BMVAL(etmidr4, 20, 23);
>  	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
>  		drvdata->config.ss_status[i] =
> -			readl_relaxed(drvdata->base + TRCSSCSRn(i));
> +			etm4x_relaxed_read32(csa, TRCSSCSRn(i));
>  	}
>  	/* NUMCIDC, bits[27:24] number of Context ID comparators for tracing */
>  	drvdata->numcidc = BMVAL(etmidr4, 24, 27);
>  	/* NUMVMIDC, bits[31:28] number of VMID comparators for tracing */
>  	drvdata->numvmidc = BMVAL(etmidr4, 28, 31);
>  
> -	etmidr5 = readl_relaxed(drvdata->base + TRCIDR5);
> +	etmidr5 = etm4x_relaxed_read32(csa, TRCIDR5);
>  	/* NUMEXTIN, bits[8:0] number of external inputs implemented */
>  	drvdata->nr_ext_inp = BMVAL(etmidr5, 0, 8);
>  	/* TRACEIDSIZE, bits[21:16] indicates the trace ID width */
> @@ -1173,8 +1171,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  	etm4_os_lock(drvdata);
>  
>  	/* wait for TRCSTATR.PMSTABLE to go up */
> -	if (coresight_timeout(&csdev->access, TRCSTATR,
> -			      TRCSTATR_PMSTABLE_BIT, 1)) {
> +	if (coresight_timeout(csa, TRCSTATR, TRCSTATR_PMSTABLE_BIT, 1)) {
>  		dev_err(etm_dev,
>  			"timeout while waiting for PM Stable Status\n");
>  		etm4_os_unlock(drvdata);
> @@ -1184,53 +1181,53 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  
>  	state = drvdata->save_state;
>  
> -	state->trcprgctlr = readl(drvdata->base + TRCPRGCTLR);
> -	state->trcprocselr = readl(drvdata->base + TRCPROCSELR);
> -	state->trcconfigr = readl(drvdata->base + TRCCONFIGR);
> -	state->trcauxctlr = readl(drvdata->base + TRCAUXCTLR);
> -	state->trceventctl0r = readl(drvdata->base + TRCEVENTCTL0R);
> -	state->trceventctl1r = readl(drvdata->base + TRCEVENTCTL1R);
> -	state->trcstallctlr = readl(drvdata->base + TRCSTALLCTLR);
> -	state->trctsctlr = readl(drvdata->base + TRCTSCTLR);
> -	state->trcsyncpr = readl(drvdata->base + TRCSYNCPR);
> -	state->trcccctlr = readl(drvdata->base + TRCCCCTLR);
> -	state->trcbbctlr = readl(drvdata->base + TRCBBCTLR);
> -	state->trctraceidr = readl(drvdata->base + TRCTRACEIDR);
> -	state->trcqctlr = readl(drvdata->base + TRCQCTLR);
> -
> -	state->trcvictlr = readl(drvdata->base + TRCVICTLR);
> -	state->trcviiectlr = readl(drvdata->base + TRCVIIECTLR);
> -	state->trcvissctlr = readl(drvdata->base + TRCVISSCTLR);
> -	state->trcvipcssctlr = readl(drvdata->base + TRCVIPCSSCTLR);
> -	state->trcvdctlr = readl(drvdata->base + TRCVDCTLR);
> -	state->trcvdsacctlr = readl(drvdata->base + TRCVDSACCTLR);
> -	state->trcvdarcctlr = readl(drvdata->base + TRCVDARCCTLR);
> +	state->trcprgctlr = etm4x_read32(csa, TRCPRGCTLR);
> +	state->trcprocselr = etm4x_read32(csa, TRCPROCSELR);
> +	state->trcconfigr = etm4x_read32(csa, TRCCONFIGR);
> +	state->trcauxctlr = etm4x_read32(csa, TRCAUXCTLR);
> +	state->trceventctl0r = etm4x_read32(csa, TRCEVENTCTL0R);
> +	state->trceventctl1r = etm4x_read32(csa, TRCEVENTCTL1R);
> +	state->trcstallctlr = etm4x_read32(csa, TRCSTALLCTLR);
> +	state->trctsctlr = etm4x_read32(csa, TRCTSCTLR);
> +	state->trcsyncpr = etm4x_read32(csa, TRCSYNCPR);
> +	state->trcccctlr = etm4x_read32(csa, TRCCCCTLR);
> +	state->trcbbctlr = etm4x_read32(csa, TRCBBCTLR);
> +	state->trctraceidr = etm4x_read32(csa, TRCTRACEIDR);
> +	state->trcqctlr = etm4x_read32(csa, TRCQCTLR);
> +
> +	state->trcvictlr = etm4x_read32(csa, TRCVICTLR);
> +	state->trcviiectlr = etm4x_read32(csa, TRCVIIECTLR);
> +	state->trcvissctlr = etm4x_read32(csa, TRCVISSCTLR);
> +	state->trcvipcssctlr = etm4x_read32(csa, TRCVIPCSSCTLR);
> +	state->trcvdctlr = etm4x_read32(csa, TRCVDCTLR);
> +	state->trcvdsacctlr = etm4x_read32(csa, TRCVDSACCTLR);
> +	state->trcvdarcctlr = etm4x_read32(csa, TRCVDARCCTLR);
>  
>  	for (i = 0; i < drvdata->nrseqstate; i++)
> -		state->trcseqevr[i] = readl(drvdata->base + TRCSEQEVRn(i));
> +		state->trcseqevr[i] = etm4x_read32(csa, TRCSEQEVRn(i));
>  
> -	state->trcseqrstevr = readl(drvdata->base + TRCSEQRSTEVR);
> -	state->trcseqstr = readl(drvdata->base + TRCSEQSTR);
> -	state->trcextinselr = readl(drvdata->base + TRCEXTINSELR);
> +	state->trcseqrstevr = etm4x_read32(csa, TRCSEQRSTEVR);
> +	state->trcseqstr = etm4x_read32(csa, TRCSEQSTR);
> +	state->trcextinselr = etm4x_read32(csa, TRCEXTINSELR);
>  
>  	for (i = 0; i < drvdata->nr_cntr; i++) {
> -		state->trccntrldvr[i] = readl(drvdata->base + TRCCNTRLDVRn(i));
> -		state->trccntctlr[i] = readl(drvdata->base + TRCCNTCTLRn(i));
> -		state->trccntvr[i] = readl(drvdata->base + TRCCNTVRn(i));
> +		state->trccntrldvr[i] = etm4x_read32(csa, TRCCNTRLDVRn(i));
> +		state->trccntctlr[i] = etm4x_read32(csa, TRCCNTCTLRn(i));
> +		state->trccntvr[i] = etm4x_read32(csa, TRCCNTVRn(i));
>  	}
>  
>  	for (i = 0; i < drvdata->nr_resource * 2; i++)
> -		state->trcrsctlr[i] = readl(drvdata->base + TRCRSCTLRn(i));
> +		state->trcrsctlr[i] = etm4x_read32(csa, TRCRSCTLRn(i));
>  
>  	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
> -		state->trcssccr[i] = readl(drvdata->base + TRCSSCCRn(i));
> -		state->trcsscsr[i] = readl(drvdata->base + TRCSSCSRn(i));
> -		state->trcsspcicr[i] = readl(drvdata->base + TRCSSPCICRn(i));
> +		state->trcssccr[i] = etm4x_read32(csa, TRCSSCCRn(i));
> +		state->trcsscsr[i] = etm4x_read32(csa, TRCSSCSRn(i));
> +		state->trcsspcicr[i] = etm4x_read32(csa, TRCSSPCICRn(i));
>  	}
>  
>  	for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) {
> -		state->trcacvr[i] = readq(drvdata->base + TRCACVRn(i));
> -		state->trcacatr[i] = readq(drvdata->base + TRCACATRn(i));
> +		state->trcacvr[i] = etm4x_read64(csa, TRCACVRn(i));
> +		state->trcacatr[i] = etm4x_read64(csa, TRCACATRn(i));
>  	}
>  
>  	/*
> @@ -1241,23 +1238,23 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  	 */
>  
>  	for (i = 0; i < drvdata->numcidc; i++)
> -		state->trccidcvr[i] = readq(drvdata->base + TRCCIDCVRn(i));
> +		state->trccidcvr[i] = etm4x_read64(csa, TRCCIDCVRn(i));
>  
>  	for (i = 0; i < drvdata->numvmidc; i++)
> -		state->trcvmidcvr[i] = readq(drvdata->base + TRCVMIDCVRn(i));
> +		state->trcvmidcvr[i] = etm4x_read64(csa, TRCVMIDCVRn(i));
>  
> -	state->trccidcctlr0 = readl(drvdata->base + TRCCIDCCTLR0);
> -	state->trccidcctlr1 = readl(drvdata->base + TRCCIDCCTLR1);
> +	state->trccidcctlr0 = etm4x_read32(csa, TRCCIDCCTLR0);
> +	state->trccidcctlr1 = etm4x_read32(csa, TRCCIDCCTLR1);
>  
> -	state->trcvmidcctlr0 = readl(drvdata->base + TRCVMIDCCTLR0);
> -	state->trcvmidcctlr0 = readl(drvdata->base + TRCVMIDCCTLR1);
> +	state->trcvmidcctlr0 = etm4x_read32(csa, TRCVMIDCCTLR0);
> +	state->trcvmidcctlr0 = etm4x_read32(csa, TRCVMIDCCTLR1);
>  
> -	state->trcclaimset = readl(drvdata->base + TRCCLAIMCLR);
> +	state->trcclaimset = etm4x_read32(csa, TRCCLAIMCLR);
>  
> -	state->trcpdcr = readl(drvdata->base + TRCPDCR);
> +	state->trcpdcr = etm4x_read32(csa, TRCPDCR);
>  
>  	/* wait for TRCSTATR.IDLE to go up */
> -	if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
> +	if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
>  		dev_err(etm_dev,
>  			"timeout while waiting for Idle Trace Status\n");
>  		etm4_os_unlock(drvdata);
> @@ -1272,8 +1269,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
>  	 * potentially save power on systems that respect the TRCPDCR_PU
>  	 * despite requesting software to save/restore state.
>  	 */
> -	writel_relaxed((state->trcpdcr & ~TRCPDCR_PU),
> -			drvdata->base + TRCPDCR);
> +	etm4x_relaxed_write32(csa, (state->trcpdcr & ~TRCPDCR_PU), TRCPDCR);
>  
>  out:
>  	CS_LOCK(csa);
> @@ -1293,84 +1289,72 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
>  	csa = &csdev->access;
>  	CS_UNLOCK(csa);
>  
> -	writel_relaxed(state->trcclaimset, drvdata->base + TRCCLAIMSET);
> -
> -	writel_relaxed(state->trcprgctlr, drvdata->base + TRCPRGCTLR);
> -	writel_relaxed(state->trcprocselr, drvdata->base + TRCPROCSELR);
> -	writel_relaxed(state->trcconfigr, drvdata->base + TRCCONFIGR);
> -	writel_relaxed(state->trcauxctlr, drvdata->base + TRCAUXCTLR);
> -	writel_relaxed(state->trceventctl0r, drvdata->base + TRCEVENTCTL0R);
> -	writel_relaxed(state->trceventctl1r, drvdata->base + TRCEVENTCTL1R);
> -	writel_relaxed(state->trcstallctlr, drvdata->base + TRCSTALLCTLR);
> -	writel_relaxed(state->trctsctlr, drvdata->base + TRCTSCTLR);
> -	writel_relaxed(state->trcsyncpr, drvdata->base + TRCSYNCPR);
> -	writel_relaxed(state->trcccctlr, drvdata->base + TRCCCCTLR);
> -	writel_relaxed(state->trcbbctlr, drvdata->base + TRCBBCTLR);
> -	writel_relaxed(state->trctraceidr, drvdata->base + TRCTRACEIDR);
> -	writel_relaxed(state->trcqctlr, drvdata->base + TRCQCTLR);
> -
> -	writel_relaxed(state->trcvictlr, drvdata->base + TRCVICTLR);
> -	writel_relaxed(state->trcviiectlr, drvdata->base + TRCVIIECTLR);
> -	writel_relaxed(state->trcvissctlr, drvdata->base + TRCVISSCTLR);
> -	writel_relaxed(state->trcvipcssctlr, drvdata->base + TRCVIPCSSCTLR);
> -	writel_relaxed(state->trcvdctlr, drvdata->base + TRCVDCTLR);
> -	writel_relaxed(state->trcvdsacctlr, drvdata->base + TRCVDSACCTLR);
> -	writel_relaxed(state->trcvdarcctlr, drvdata->base + TRCVDARCCTLR);
> +	etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET);
> +
> +	etm4x_relaxed_write32(csa, state->trcprgctlr, TRCPRGCTLR);
> +	etm4x_relaxed_write32(csa, state->trcprocselr, TRCPROCSELR);
> +	etm4x_relaxed_write32(csa, state->trcconfigr, TRCCONFIGR);
> +	etm4x_relaxed_write32(csa, state->trcauxctlr, TRCAUXCTLR);
> +	etm4x_relaxed_write32(csa, state->trceventctl0r, TRCEVENTCTL0R);
> +	etm4x_relaxed_write32(csa, state->trceventctl1r, TRCEVENTCTL1R);
> +	etm4x_relaxed_write32(csa, state->trcstallctlr, TRCSTALLCTLR);
> +	etm4x_relaxed_write32(csa, state->trctsctlr, TRCTSCTLR);
> +	etm4x_relaxed_write32(csa, state->trcsyncpr, TRCSYNCPR);
> +	etm4x_relaxed_write32(csa, state->trcccctlr, TRCCCCTLR);
> +	etm4x_relaxed_write32(csa, state->trcbbctlr, TRCBBCTLR);
> +	etm4x_relaxed_write32(csa, state->trctraceidr, TRCTRACEIDR);
> +	etm4x_relaxed_write32(csa, state->trcqctlr, TRCQCTLR);
> +
> +	etm4x_relaxed_write32(csa, state->trcvictlr, TRCVICTLR);
> +	etm4x_relaxed_write32(csa, state->trcviiectlr, TRCVIIECTLR);
> +	etm4x_relaxed_write32(csa, state->trcvissctlr, TRCVISSCTLR);
> +	etm4x_relaxed_write32(csa, state->trcvipcssctlr, TRCVIPCSSCTLR);
> +	etm4x_relaxed_write32(csa, state->trcvdctlr, TRCVDCTLR);
> +	etm4x_relaxed_write32(csa, state->trcvdsacctlr, TRCVDSACCTLR);
> +	etm4x_relaxed_write32(csa, state->trcvdarcctlr, TRCVDARCCTLR);
>  
>  	for (i = 0; i < drvdata->nrseqstate; i++)
> -		writel_relaxed(state->trcseqevr[i],
> -			       drvdata->base + TRCSEQEVRn(i));
> +		etm4x_relaxed_write32(csa, state->trcseqevr[i], TRCSEQEVRn(i));
>  
> -	writel_relaxed(state->trcseqrstevr, drvdata->base + TRCSEQRSTEVR);
> -	writel_relaxed(state->trcseqstr, drvdata->base + TRCSEQSTR);
> -	writel_relaxed(state->trcextinselr, drvdata->base + TRCEXTINSELR);
> +	etm4x_relaxed_write32(csa, state->trcseqrstevr, TRCSEQRSTEVR);
> +	etm4x_relaxed_write32(csa, state->trcseqstr, TRCSEQSTR);
> +	etm4x_relaxed_write32(csa, state->trcextinselr, TRCEXTINSELR);
>  
>  	for (i = 0; i < drvdata->nr_cntr; i++) {
> -		writel_relaxed(state->trccntrldvr[i],
> -			       drvdata->base + TRCCNTRLDVRn(i));
> -		writel_relaxed(state->trccntctlr[i],
> -			       drvdata->base + TRCCNTCTLRn(i));
> -		writel_relaxed(state->trccntvr[i],
> -			       drvdata->base + TRCCNTVRn(i));
> +		etm4x_relaxed_write32(csa, state->trccntrldvr[i], TRCCNTRLDVRn(i));
> +		etm4x_relaxed_write32(csa, state->trccntctlr[i], TRCCNTCTLRn(i));
> +		etm4x_relaxed_write32(csa, state->trccntvr[i], TRCCNTVRn(i));
>  	}
>  
>  	for (i = 0; i < drvdata->nr_resource * 2; i++)
> -		writel_relaxed(state->trcrsctlr[i],
> -			       drvdata->base + TRCRSCTLRn(i));
> +		etm4x_relaxed_write32(csa, state->trcrsctlr[i], TRCRSCTLRn(i));
>  
>  	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
> -		writel_relaxed(state->trcssccr[i],
> -			       drvdata->base + TRCSSCCRn(i));
> -		writel_relaxed(state->trcsscsr[i],
> -			       drvdata->base + TRCSSCSRn(i));
> -		writel_relaxed(state->trcsspcicr[i],
> -			       drvdata->base + TRCSSPCICRn(i));
> +		etm4x_relaxed_write32(csa, state->trcssccr[i], TRCSSCCRn(i));
> +		etm4x_relaxed_write32(csa, state->trcsscsr[i], TRCSSCSRn(i));
> +		etm4x_relaxed_write32(csa, state->trcsspcicr[i], TRCSSPCICRn(i));
>  	}
>  
>  	for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) {
> -		writeq_relaxed(state->trcacvr[i],
> -			       drvdata->base + TRCACVRn(i));
> -		writeq_relaxed(state->trcacatr[i],
> -			       drvdata->base + TRCACATRn(i));
> +		etm4x_relaxed_write64(csa, state->trcacvr[i], TRCACVRn(i));
> +		etm4x_relaxed_write64(csa, state->trcacatr[i], TRCACATRn(i));
>  	}
>  
>  	for (i = 0; i < drvdata->numcidc; i++)
> -		writeq_relaxed(state->trccidcvr[i],
> -			       drvdata->base + TRCCIDCVRn(i));
> +		etm4x_relaxed_write64(csa, state->trccidcvr[i], TRCCIDCVRn(i));
>  
>  	for (i = 0; i < drvdata->numvmidc; i++)
> -		writeq_relaxed(state->trcvmidcvr[i],
> -			       drvdata->base + TRCVMIDCVRn(i));
> +		etm4x_relaxed_write64(csa, state->trcvmidcvr[i], TRCVMIDCVRn(i));
>  
> -	writel_relaxed(state->trccidcctlr0, drvdata->base + TRCCIDCCTLR0);
> -	writel_relaxed(state->trccidcctlr1, drvdata->base + TRCCIDCCTLR1);
> +	etm4x_relaxed_write32(csa, state->trccidcctlr0, TRCCIDCCTLR0);
> +	etm4x_relaxed_write32(csa, state->trccidcctlr1, TRCCIDCCTLR1);
>  
> -	writel_relaxed(state->trcvmidcctlr0, drvdata->base + TRCVMIDCCTLR0);
> -	writel_relaxed(state->trcvmidcctlr0, drvdata->base + TRCVMIDCCTLR1);
> +	etm4x_relaxed_write32(csa, state->trcvmidcctlr0, TRCVMIDCCTLR0);
> +	etm4x_relaxed_write32(csa, state->trcvmidcctlr0, TRCVMIDCCTLR1);
>  
> -	writel_relaxed(state->trcclaimset, drvdata->base + TRCCLAIMSET);
> +	etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET);
>  
> -	writel_relaxed(state->trcpdcr, drvdata->base + TRCPDCR);
> +	etm4x_relaxed_write32(csa, state->trcpdcr, TRCPDCR);
>  
>  	drvdata->state_needs_restore = false;
>  
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
> index b8283e1d6d88..2b51d03ab6d7 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.h
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.h
> @@ -120,6 +120,30 @@
>  #define TRCCIDR2			0xFF8
>  #define TRCCIDR3			0xFFC
>  
> +#define etm4x_relaxed_read32(csa, offset)		\
> +	readl_relaxed((csa)->base + (offset))
> +
> +#define etm4x_read32(csa, offset)			\
> +	readl((csa)->base + (offset))
> +
> +#define etm4x_relaxed_write32(csa, val, offset)		\
> +	writel_relaxed((val), (csa)->base + (offset))
> +
> +#define etm4x_write32(csa, val, offset)			\
> +	writel((val), (csa)->base + (offset))
> +
> +#define etm4x_relaxed_read64(csa, offset)		\
> +	readq_relaxed((csa)->base + (offset))
> +
> +#define etm4x_read64(csa, offset)			\
> +	readq((csa)->base + (offset))
> +
> +#define etm4x_relaxed_write64(csa, val, offset)		\
> +	writeq_relaxed((val), (csa)->base + (offset))
> +
> +#define etm4x_write64(csa, val, offset)			\
> +	writeq((val), (csa)->base + (offset))
> +

Since I haven't gone through the rest of the patches I'll assume you want to
enhance the above to pick an access type at some point in the future.

>  /* ETMv4 resources */
>  #define ETM_MAX_NR_PE			8
>  #define ETMv4_MAX_CNTR			4
> -- 
> 2.24.1
> 

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Re: [RFC PATCH 08/14] coresight: etm4x: Convert all register accesses

[Suzuki K Poulose]

On 07/30/2020 09:20 PM, Mathieu Poirier wrote:
> On Wed, Jul 22, 2020 at 06:20:34PM +0100, Suzuki K Poulose wrote:
>> Convert all register accesses from etm4x driver to use a wrapper
>> to allow switching the access at runtime with little overhead.
>>
>> co-developed by sed tool ;-), mostly equivalent to :
>>
>> s/readl\(_relaxed\)\?(drvdata->base + \(.*\))/etm4x_\1_read32(csdev, \2)
>> s/writel\(_relaxed\)\?(\(.*\), drvdata->base + \(.*\))/etm4x_\1_write32(csdev, \2, \3)
>>
>> We don't want to replace them with the csdev_access_* to
>> avoid a function call for every register access for system
>> register access.
>>
>> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
>> Cc: Mike Leach <mike.leach@linaro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> ---
>>   .../coresight/coresight-etm4x-sysfs.c         |   9 +-
>>   drivers/hwtracing/coresight/coresight-etm4x.c | 334 +++++++++---------
>>   drivers/hwtracing/coresight/coresight-etm4x.h |  24 ++
>>   3 files changed, 189 insertions(+), 178 deletions(-)
>>


Agreed to all the comments.

>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
>> index b8283e1d6d88..2b51d03ab6d7 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x.h
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x.h
>> @@ -120,6 +120,30 @@
>>   #define TRCCIDR2			0xFF8
>>   #define TRCCIDR3			0xFFC
>>   
>> +#define etm4x_relaxed_read32(csa, offset)		\
>> +	readl_relaxed((csa)->base + (offset))
>> +
>> +#define etm4x_read32(csa, offset)			\
>> +	readl((csa)->base + (offset))
>> +
>> +#define etm4x_relaxed_write32(csa, val, offset)		\
>> +	writel_relaxed((val), (csa)->base + (offset))
>> +
>> +#define etm4x_write32(csa, val, offset)			\
>> +	writel((val), (csa)->base + (offset))
>> +
>> +#define etm4x_relaxed_read64(csa, offset)		\
>> +	readq_relaxed((csa)->base + (offset))
>> +
>> +#define etm4x_read64(csa, offset)			\
>> +	readq((csa)->base + (offset))
>> +
>> +#define etm4x_relaxed_write64(csa, val, offset)		\
>> +	writeq_relaxed((val), (csa)->base + (offset))
>> +
>> +#define etm4x_write64(csa, val, offset)			\
>> +	writeq((val), (csa)->base + (offset))
>> +
> 
> Since I haven't gone through the rest of the patches I'll assume you want to
> enhance the above to pick an access type at some point in the future.
> 

Yes, they are plumbed in with the introduction of system instruction
support. We don't want to the overhead of a function call for
each register access. Also, we would like to avoid jumping
through the large switch..cases for a compile time constant
offset. Hence this macro.

Cheers
Suzuki

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[RFC PATCH 09/14] coresight: etm4x: Add sysreg access helpers

[Suzuki K Poulose]

ETMv4.4 architecture defines the system instructions for accessing
ETM via register accesses. Add basic support for accessing a given
register via system instructions.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x.c |  39 ++
 drivers/hwtracing/coresight/coresight-etm4x.h | 379 ++++++++++++++++--
 2 files changed, 394 insertions(+), 24 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index b901c91d3ee4..e37aababa4c9 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -57,6 +57,45 @@ static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
 
 static enum cpuhp_state hp_online;
 
+u64 etm4x_sysreg_read(struct csdev_access *csa,
+		      u32 offset,
+		      bool _relaxed,
+		      bool _64bit)
+{
+	u64 res = 0;
+
+	if (!_relaxed)
+		mb();	/* Imitate the !relaxed I/O helpers */
+
+	switch (offset) {
+	ETM4x_READ_CASES(res)
+	default :
+		WARN_ONCE(1, "etm4x: trying to read unsupported register @%x\n",
+			 offset);
+	}
+
+	return res;
+}
+
+void etm4x_sysreg_write(struct csdev_access *csa,
+			u64 val,
+			u32 offset,
+			bool _relaxed,
+			bool _64bit)
+{
+	if (!_relaxed)
+		mb();	/* Imitate the !relaxed I/O helpers */
+	if (!_64bit)
+		val &= GENMASK(31, 0);
+
+	switch (offset) {
+	ETM4x_WRITE_CASES(val)
+	default :
+		WARN_ONCE(1, "etm4x: trying to write to unsupported register @%x\n",
+			offset);
+	}
+}
+
 static void etm4_os_unlock_csa(struct etmv4_drvdata *drvdata, struct csdev_access *csa)
 {
 	/* Writing 0 to TRCOSLAR unlocks the trace registers */
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index 2b51d03ab6d7..f5d708206339 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -44,13 +44,13 @@
 #define TRCVDSACCTLR			0x0A4
 #define TRCVDARCCTLR			0x0A8
 /* Derived resources registers */
-#define TRCSEQEVRn(n)			(0x100 + (n * 4))
+#define TRCSEQEVRn(n)			(0x100 + (n * 4)) /* n = 0-2 */
 #define TRCSEQRSTEVR			0x118
 #define TRCSEQSTR			0x11C
 #define TRCEXTINSELR			0x120
-#define TRCCNTRLDVRn(n)			(0x140 + (n * 4))
-#define TRCCNTCTLRn(n)			(0x150 + (n * 4))
-#define TRCCNTVRn(n)			(0x160 + (n * 4))
+#define TRCCNTRLDVRn(n)			(0x140 + (n * 4)) /* n = 0-3 */
+#define TRCCNTCTLRn(n)			(0x150 + (n * 4)) /* n = 0-3 */
+#define TRCCNTVRn(n)			(0x160 + (n * 4)) /* n = 0-3 */
 /* ID registers */
 #define TRCIDR8				0x180
 #define TRCIDR9				0x184
@@ -59,7 +59,7 @@
 #define TRCIDR12			0x190
 #define TRCIDR13			0x194
 #define TRCIMSPEC0			0x1C0
-#define TRCIMSPECn(n)			(0x1C0 + (n * 4))
+#define TRCIMSPECn(n)			(0x1C0 + (n * 4)) /* n = 1-7 */
 #define TRCIDR0				0x1E0
 #define TRCIDR1				0x1E4
 #define TRCIDR2				0x1E8
@@ -68,9 +68,12 @@
 #define TRCIDR5				0x1F4
 #define TRCIDR6				0x1F8
 #define TRCIDR7				0x1FC
-/* Resource selection registers */
+/*
+ * Resource selection registers, n = 2-31.
+ * First pair (regs 0, 1) is always present and is reserved.
+ */
 #define TRCRSCTLRn(n)			(0x200 + (n * 4))
-/* Single-shot comparator registers */
+/* Single-shot comparator registers, n = 0-7 */
 #define TRCSSCCRn(n)			(0x280 + (n * 4))
 #define TRCSSCSRn(n)			(0x2A0 + (n * 4))
 #define TRCSSPCICRn(n)			(0x2C0 + (n * 4))
@@ -80,11 +83,13 @@
 #define TRCPDCR				0x310
 #define TRCPDSR				0x314
 /* Trace registers (0x318-0xEFC) */
-/* Comparator registers */
+/* Address Comparator registers n = 0-15 */
 #define TRCACVRn(n)			(0x400 + (n * 8))
 #define TRCACATRn(n)			(0x480 + (n * 8))
+/* Data Value Comparator Value registers, n = 0-7 */
 #define TRCDVCVRn(n)			(0x500 + (n * 16))
 #define TRCDVCMRn(n)			(0x580 + (n * 16))
+/* ContextID/Virtual ContextID comparators, n = 0-7 */
 #define TRCCIDCVRn(n)			(0x600 + (n * 8))
 #define TRCVMIDCVRn(n)			(0x640 + (n * 8))
 #define TRCCIDCCTLR0			0x680
@@ -120,29 +125,345 @@
 #define TRCCIDR2			0xFF8
 #define TRCCIDR3			0xFFC
 
-#define etm4x_relaxed_read32(csa, offset)		\
-	readl_relaxed((csa)->base + (offset))
+/*
+ * System instructions to access ETM registers.
+ * See ETMv4.4 spec ARM IHI0064F section 4.3.6 System instructions
+ */
+#define ETM4x_OFFSET_TO_REG(x)		((x) >> 2)
+
+#if defined(CONFIG_ARM64)
+
+#define ETM4x_CRn(n)			(((n) >> 7) & 0x7)
+#define ETM4x_Op2(n)			(((n) >> 4) & 0x7)
+#define ETM4x_CRm(n)			((n) & 0xf)
+
+#include <asm/sysreg.h>
+#define ETM4x_REG_NUM_TO_SYSREG(n)				\
+	sys_reg(2, 1, ETM4x_CRn(n), ETM4x_CRm(n), ETM4x_Op2(n))
+
+#define READ_ETM4x_REG(reg)					\
+	read_sysreg_s(ETM4x_REG_NUM_TO_SYSREG((reg)))
+#define WRITE_ETM4x_REG(val, reg)				\
+	write_sysreg_s(val, ETM4x_REG_NUM_TO_SYSREG((reg)))
 
-#define etm4x_read32(csa, offset)			\
-	readl((csa)->base + (offset))
+#define read_etm4x_sysreg_const_offset(offset)			\
+	READ_ETM4x_REG(ETM4x_OFFSET_TO_REG(offset))
 
-#define etm4x_relaxed_write32(csa, val, offset)		\
-	writel_relaxed((val), (csa)->base + (offset))
+#define write_etm4x_sysreg_const_offset(val, offset)		\
+	WRITE_ETM4x_REG(val, ETM4x_OFFSET_TO_REG(offset))
 
-#define etm4x_write32(csa, val, offset)			\
-	writel((val), (csa)->base + (offset))
+#elif defined(CONFIG_ARM)
 
-#define etm4x_relaxed_read64(csa, offset)		\
-	readq_relaxed((csa)->base + (offset))
+#include <asm/hardware/cp14.h>
 
-#define etm4x_read64(csa, offset)			\
-	readq((csa)->base + (offset))
+#define etm4x_cp14_CRn(n)		__stringify(ETM4x_CRn(n))
+#define etm4x_cp14_CRm(n)		__stringify(ETM4x_CRm(n))
+#define etm4x_cp14_Op2(n)		__stringify(ETM4x_Op2(n))
 
-#define etm4x_relaxed_write64(csa, val, offset)		\
-	writeq_relaxed((val), (csa)->base + (offset))
+#define READ_ETM4x_REG(reg)				\
+	MRC14(1, ETM4x_CRn(reg), ETM4x_CRm(reg), ETM4x_Op2(reg))
+
+#define read_etm4x_sysreg_const_offset(offset)				\
+	READ_ETM4x_REG(ETM4x_OFFSET_TO_REG(offset))
+
+#define WRITE_ETM4x_REG(val, reg)		\
+	MCR14((val), 1, ETM4x_CRn((reg)), ETM4x_CRm((reg)), ETM4x_Op2((reg)))
+
+#define write_etm4x_sysreg_const_offset(val, offset)		\
+	WRITE_ETM4x_REG(val, ETM4x_OFFSET_TO_REG(offset))
+
+#endif
+
+#define CASE_READ(res, x)					\
+	case (x): { (res) = read_etm4x_sysreg_const_offset((x)); break; }
+
+#define CASE_WRITE(val, x)					\
+	case (x): { write_etm4x_sysreg_const_offset((val), (x)); break; }
+
+#define CASE_LIST(op, val)			\
+	CASE_##op((val), TRCPRGCTLR)		\
+	CASE_##op((val), TRCPROCSELR)		\
+	CASE_##op((val), TRCSTATR)		\
+	CASE_##op((val), TRCCONFIGR)		\
+	CASE_##op((val), TRCAUXCTLR)		\
+	CASE_##op((val), TRCEVENTCTL0R)		\
+	CASE_##op((val), TRCEVENTCTL1R)		\
+	CASE_##op((val), TRCSTALLCTLR)		\
+	CASE_##op((val), TRCTSCTLR)		\
+	CASE_##op((val), TRCSYNCPR)		\
+	CASE_##op((val), TRCCCCTLR)		\
+	CASE_##op((val), TRCBBCTLR)		\
+	CASE_##op((val), TRCTRACEIDR)		\
+	CASE_##op((val), TRCQCTLR)		\
+	CASE_##op((val), TRCVICTLR)		\
+	CASE_##op((val), TRCVIIECTLR)		\
+	CASE_##op((val), TRCVISSCTLR)		\
+	CASE_##op((val), TRCVIPCSSCTLR)		\
+	CASE_##op((val), TRCVDCTLR)		\
+	CASE_##op((val), TRCVDSACCTLR)		\
+	CASE_##op((val), TRCVDARCCTLR)		\
+	CASE_##op((val), TRCSEQEVRn(0))		\
+	CASE_##op((val), TRCSEQEVRn(1))		\
+	CASE_##op((val), TRCSEQEVRn(2))		\
+	CASE_##op((val), TRCSEQRSTEVR)		\
+	CASE_##op((val), TRCSEQSTR)		\
+	CASE_##op((val), TRCEXTINSELR)		\
+	CASE_##op((val), TRCCNTRLDVRn(0))	\
+	CASE_##op((val), TRCCNTRLDVRn(1))	\
+	CASE_##op((val), TRCCNTRLDVRn(2))	\
+	CASE_##op((val), TRCCNTRLDVRn(3))	\
+	CASE_##op((val), TRCCNTCTLRn(0))	\
+	CASE_##op((val), TRCCNTCTLRn(1))	\
+	CASE_##op((val), TRCCNTCTLRn(2))	\
+	CASE_##op((val), TRCCNTCTLRn(3))	\
+	CASE_##op((val), TRCCNTVRn(0))		\
+	CASE_##op((val), TRCCNTVRn(1))		\
+	CASE_##op((val), TRCCNTVRn(2))		\
+	CASE_##op((val), TRCCNTVRn(3))		\
+	CASE_##op((val), TRCIDR8)		\
+	CASE_##op((val), TRCIDR9)		\
+	CASE_##op((val), TRCIDR10)		\
+	CASE_##op((val), TRCIDR11)		\
+	CASE_##op((val), TRCIDR12)		\
+	CASE_##op((val), TRCIDR13)		\
+	CASE_##op((val), TRCIMSPECn(0))		\
+	CASE_##op((val), TRCIMSPECn(1))		\
+	CASE_##op((val), TRCIMSPECn(2))		\
+	CASE_##op((val), TRCIMSPECn(3))		\
+	CASE_##op((val), TRCIMSPECn(4))		\
+	CASE_##op((val), TRCIMSPECn(5))		\
+	CASE_##op((val), TRCIMSPECn(6))		\
+	CASE_##op((val), TRCIMSPECn(7))		\
+	CASE_##op((val), TRCIDR0)		\
+	CASE_##op((val), TRCIDR1)		\
+	CASE_##op((val), TRCIDR2)		\
+	CASE_##op((val), TRCIDR3)		\
+	CASE_##op((val), TRCIDR4)		\
+	CASE_##op((val), TRCIDR5)		\
+	CASE_##op((val), TRCIDR6)		\
+	CASE_##op((val), TRCIDR7)		\
+	CASE_##op((val), TRCRSCTLRn(2))		\
+	CASE_##op((val), TRCRSCTLRn(3))		\
+	CASE_##op((val), TRCRSCTLRn(4))		\
+	CASE_##op((val), TRCRSCTLRn(5))		\
+	CASE_##op((val), TRCRSCTLRn(6))		\
+	CASE_##op((val), TRCRSCTLRn(7))		\
+	CASE_##op((val), TRCRSCTLRn(8))		\
+	CASE_##op((val), TRCRSCTLRn(9))		\
+	CASE_##op((val), TRCRSCTLRn(10))	\
+	CASE_##op((val), TRCRSCTLRn(11))	\
+	CASE_##op((val), TRCRSCTLRn(12))	\
+	CASE_##op((val), TRCRSCTLRn(13))	\
+	CASE_##op((val), TRCRSCTLRn(14))	\
+	CASE_##op((val), TRCRSCTLRn(15))	\
+	CASE_##op((val), TRCRSCTLRn(16))	\
+	CASE_##op((val), TRCRSCTLRn(17))	\
+	CASE_##op((val), TRCRSCTLRn(18))	\
+	CASE_##op((val), TRCRSCTLRn(19))	\
+	CASE_##op((val), TRCRSCTLRn(20))	\
+	CASE_##op((val), TRCRSCTLRn(21))	\
+	CASE_##op((val), TRCRSCTLRn(22))	\
+	CASE_##op((val), TRCRSCTLRn(23))	\
+	CASE_##op((val), TRCRSCTLRn(24))	\
+	CASE_##op((val), TRCRSCTLRn(25))	\
+	CASE_##op((val), TRCRSCTLRn(26))	\
+	CASE_##op((val), TRCRSCTLRn(27))	\
+	CASE_##op((val), TRCRSCTLRn(28))	\
+	CASE_##op((val), TRCRSCTLRn(29))	\
+	CASE_##op((val), TRCRSCTLRn(30))	\
+	CASE_##op((val), TRCRSCTLRn(31))	\
+	CASE_##op((val), TRCSSCCRn(0))		\
+	CASE_##op((val), TRCSSCCRn(1))		\
+	CASE_##op((val), TRCSSCCRn(2))		\
+	CASE_##op((val), TRCSSCCRn(3))		\
+	CASE_##op((val), TRCSSCCRn(4))		\
+	CASE_##op((val), TRCSSCCRn(5))		\
+	CASE_##op((val), TRCSSCCRn(6))		\
+	CASE_##op((val), TRCSSCCRn(7))		\
+	CASE_##op((val), TRCSSCSRn(0))		\
+	CASE_##op((val), TRCSSCSRn(1))		\
+	CASE_##op((val), TRCSSCSRn(2))		\
+	CASE_##op((val), TRCSSCSRn(3))		\
+	CASE_##op((val), TRCSSCSRn(4))		\
+	CASE_##op((val), TRCSSCSRn(5))		\
+	CASE_##op((val), TRCSSCSRn(6))		\
+	CASE_##op((val), TRCSSCSRn(7))		\
+	CASE_##op((val), TRCSSPCICRn(0))	\
+	CASE_##op((val), TRCSSPCICRn(1))	\
+	CASE_##op((val), TRCSSPCICRn(2))	\
+	CASE_##op((val), TRCSSPCICRn(3))	\
+	CASE_##op((val), TRCSSPCICRn(4))	\
+	CASE_##op((val), TRCSSPCICRn(5))	\
+	CASE_##op((val), TRCSSPCICRn(6))	\
+	CASE_##op((val), TRCSSPCICRn(7))	\
+	CASE_##op((val), TRCOSLAR)		\
+	CASE_##op((val), TRCOSLSR)		\
+	CASE_##op((val), TRCPDCR)		\
+	CASE_##op((val), TRCPDSR)		\
+	CASE_##op((val), TRCACVRn(0))		\
+	CASE_##op((val), TRCACVRn(1))		\
+	CASE_##op((val), TRCACVRn(2))		\
+	CASE_##op((val), TRCACVRn(3))		\
+	CASE_##op((val), TRCACVRn(4))		\
+	CASE_##op((val), TRCACVRn(5))		\
+	CASE_##op((val), TRCACVRn(6))		\
+	CASE_##op((val), TRCACVRn(7))		\
+	CASE_##op((val), TRCACVRn(8))		\
+	CASE_##op((val), TRCACVRn(9))		\
+	CASE_##op((val), TRCACVRn(10))		\
+	CASE_##op((val), TRCACVRn(11))		\
+	CASE_##op((val), TRCACVRn(12))		\
+	CASE_##op((val), TRCACVRn(13))		\
+	CASE_##op((val), TRCACVRn(14))		\
+	CASE_##op((val), TRCACVRn(15))		\
+	CASE_##op((val), TRCACATRn(0))		\
+	CASE_##op((val), TRCACATRn(1))		\
+	CASE_##op((val), TRCACATRn(2))		\
+	CASE_##op((val), TRCACATRn(3))		\
+	CASE_##op((val), TRCACATRn(4))		\
+	CASE_##op((val), TRCACATRn(5))		\
+	CASE_##op((val), TRCACATRn(6))		\
+	CASE_##op((val), TRCACATRn(7))		\
+	CASE_##op((val), TRCACATRn(8))		\
+	CASE_##op((val), TRCACATRn(9))		\
+	CASE_##op((val), TRCACATRn(10))		\
+	CASE_##op((val), TRCACATRn(11))		\
+	CASE_##op((val), TRCACATRn(12))		\
+	CASE_##op((val), TRCACATRn(13))		\
+	CASE_##op((val), TRCACATRn(14))		\
+	CASE_##op((val), TRCACATRn(15))		\
+	CASE_##op((val), TRCDVCVRn(0))		\
+	CASE_##op((val), TRCDVCVRn(1))		\
+	CASE_##op((val), TRCDVCVRn(2))		\
+	CASE_##op((val), TRCDVCVRn(3))		\
+	CASE_##op((val), TRCDVCVRn(4))		\
+	CASE_##op((val), TRCDVCVRn(5))		\
+	CASE_##op((val), TRCDVCVRn(6))		\
+	CASE_##op((val), TRCDVCVRn(7))		\
+	CASE_##op((val), TRCDVCMRn(0))		\
+	CASE_##op((val), TRCDVCMRn(1))		\
+	CASE_##op((val), TRCDVCMRn(2))		\
+	CASE_##op((val), TRCDVCMRn(3))		\
+	CASE_##op((val), TRCDVCMRn(4))		\
+	CASE_##op((val), TRCDVCMRn(5))		\
+	CASE_##op((val), TRCDVCMRn(6))		\
+	CASE_##op((val), TRCDVCMRn(7))		\
+	CASE_##op((val), TRCCIDCVRn(0))		\
+	CASE_##op((val), TRCCIDCVRn(1))		\
+	CASE_##op((val), TRCCIDCVRn(2))		\
+	CASE_##op((val), TRCCIDCVRn(3))		\
+	CASE_##op((val), TRCCIDCVRn(4))		\
+	CASE_##op((val), TRCCIDCVRn(5))		\
+	CASE_##op((val), TRCCIDCVRn(6))		\
+	CASE_##op((val), TRCCIDCVRn(7))		\
+	CASE_##op((val), TRCVMIDCVRn(0))	\
+	CASE_##op((val), TRCVMIDCVRn(1))	\
+	CASE_##op((val), TRCVMIDCVRn(2))	\
+	CASE_##op((val), TRCVMIDCVRn(3))	\
+	CASE_##op((val), TRCVMIDCVRn(4))	\
+	CASE_##op((val), TRCVMIDCVRn(5))	\
+	CASE_##op((val), TRCVMIDCVRn(6))	\
+	CASE_##op((val), TRCVMIDCVRn(7))	\
+	CASE_##op((val), TRCCIDCCTLR0)		\
+	CASE_##op((val), TRCCIDCCTLR1)		\
+	CASE_##op((val), TRCVMIDCCTLR0)		\
+	CASE_##op((val), TRCVMIDCCTLR1)		\
+	CASE_##op((val), TRCITCTRL)		\
+	CASE_##op((val), TRCCLAIMSET)		\
+	CASE_##op((val), TRCCLAIMCLR)		\
+	CASE_##op((val), TRCDEVAFF0)		\
+	CASE_##op((val), TRCDEVAFF1)		\
+	CASE_##op((val), TRCLAR)		\
+	CASE_##op((val), TRCLSR)		\
+	CASE_##op((val), TRCAUTHSTATUS)		\
+	CASE_##op((val), TRCDEVARCH)		\
+	CASE_##op((val), TRCDEVID)		\
+	CASE_##op((val), TRCDEVTYPE)		\
+	CASE_##op((val), TRCPIDR4)		\
+	CASE_##op((val), TRCPIDR5)		\
+	CASE_##op((val), TRCPIDR6)		\
+	CASE_##op((val), TRCPIDR7)		\
+	CASE_##op((val), TRCPIDR0)		\
+	CASE_##op((val), TRCPIDR1)		\
+	CASE_##op((val), TRCPIDR2)		\
+	CASE_##op((val), TRCPIDR3)
+
+#define ETM4x_READ_CASES(res)	CASE_LIST(READ, (res))
+#define ETM4x_WRITE_CASES(val)	CASE_LIST(WRITE, (val))
+
+#define __read_etm4x_sysreg_offset(csa, offset, _64bit)				\
+	({									\
+		u64 __val;							\
+										\
+		if (__builtin_constant_p((offset)))				\
+			__val = read_etm4x_sysreg_const_offset((offset));	\
+		else								\
+			__val = etm4x_sysreg_read((csa), (offset),		\
+						  true, _64bit);		\
+		__val;								\
+	 })
+
+#define __write_etm4x_sysreg_offset(csa, val, offset, _64bit)		\
+	do {								\
+		if (__builtin_constant_p((offset)))			\
+			write_etm4x_sysreg_const_offset((val),		\
+							(offset));	\
+		else							\
+			etm4x_sysreg_write((csa), (val), (offset),	\
+						true, _64bit);		\
+	} while (0)
+
+
+#define etm4x_relaxed_read32(csa, offset)				\
+	(u32)(!(csa)->no_iomem ?					\
+		 readl_relaxed((csa)->base + (offset)) :		\
+		 __read_etm4x_sysreg_offset((csa), (offset), false))
+#define etm4x_relaxed_read64(csa, offset)				\
+	(u64)(!(csa)->no_iomem ?					\
+		 readq_relaxed((csa)->base + (offset)) :		\
+		 __read_etm4x_sysreg_offset((csa), (offset), true))
+#define etm4x_read32(csa, offset)					\
+	({								\
+		mb(); /* enforce order */				\
+		etm4x_relaxed_read32((csa), (offset));			\
+	 })
+
+#define etm4x_read64(csa, offset)					\
+	({								\
+		mb(); /* enforce order */				\
+		etm4x_relaxed_read64((csa), (offset));			\
+	 })
+
+#define etm4x_relaxed_write32(csa, val, offset)				\
+	do {								\
+		if (!(csa)->no_iomem)					\
+			writel_relaxed((val), (csa)->base + (offset));	\
+		else							\
+			__write_etm4x_sysreg_offset((csa), (val),	\
+						    (offset), false);	\
+	} while (0)
+
+#define etm4x_relaxed_write64(csa, val, offset)				\
+	do {								\
+		if (!(csa)->no_iomem)					\
+			writeq_relaxed((val), (csa)->base + (offset));	\
+		else							\
+			__write_etm4x_sysreg_offset((csa), (val),	\
+						    (offset), true);	\
+	} while (0)
+
+#define etm4x_write32(csa, val, offset)					\
+	do {								\
+		mb(); /* enforce order */				\
+		etm4x_relaxed_write32((csa), (val), (offset));		\
+	} while (0)
+
+#define etm4x_write64(csa, val, offset)					\
+	do {								\
+		mb(); /* enforce order */				\
+		etm4x_relaxed_write64((csa), (val), (offset));		\
+	} while (0)
 
-#define etm4x_write64(csa, val, offset)			\
-	writeq((val), (csa)->base + (offset))
 
 /* ETMv4 resources */
 #define ETM_MAX_NR_PE			8
@@ -501,4 +822,14 @@ enum etm_addr_ctxtype {
 
 extern const struct attribute_group *coresight_etmv4_groups[];
 void etm4_config_trace_mode(struct etmv4_config *config);
+
+u64 etm4x_sysreg_read(struct csdev_access *csa,
+		      u32 offset,
+		      bool _relaxed,
+		      bool _64bit);
+void etm4x_sysreg_write(struct csdev_access *csa,
+			u64 val,
+			u32 offset,
+			bool _relaxed,
+			bool _64bit);
 #endif
-- 
2.24.1


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Re: [RFC PATCH 09/14] coresight: etm4x: Add sysreg access helpers

[Mathieu Poirier]

On Wed, Jul 22, 2020 at 06:20:35PM +0100, Suzuki K Poulose wrote:
> ETMv4.4 architecture defines the system instructions for accessing
> ETM via register accesses. Add basic support for accessing a given
> register via system instructions.
> 
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-etm4x.c |  39 ++
>  drivers/hwtracing/coresight/coresight-etm4x.h | 379 ++++++++++++++++--
>  2 files changed, 394 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index b901c91d3ee4..e37aababa4c9 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -57,6 +57,45 @@ static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
>  
>  static enum cpuhp_state hp_online;
>  
> +u64 etm4x_sysreg_read(struct csdev_access *csa,
> +		      u32 offset,
> +		      bool _relaxed,
> +		      bool _64bit)
> +{
> +	u64 res = 0;
> +
> +	if (!_relaxed)
> +		mb();	/* Imitate the !relaxed I/O helpers */
> +
> +	switch (offset) {
> +	ETM4x_READ_CASES(res)
> +	default :
> +		WARN_ONCE(1, "etm4x: trying to read unsupported register @%x\n",
> +			 offset);
> +	}
> +
> +	return res;
> +}
> +
> +void etm4x_sysreg_write(struct csdev_access *csa,
> +			u64 val,
> +			u32 offset,
> +			bool _relaxed,
> +			bool _64bit)
> +{
> +	if (!_relaxed)
> +		mb();	/* Imitate the !relaxed I/O helpers */
> +	if (!_64bit)
> +		val &= GENMASK(31, 0);
> +
> +	switch (offset) {
> +	ETM4x_WRITE_CASES(val)
> +	default :
> +		WARN_ONCE(1, "etm4x: trying to write to unsupported register @%x\n",
> +			offset);
> +	}
> +}
> +
>  static void etm4_os_unlock_csa(struct etmv4_drvdata *drvdata, struct csdev_access *csa)
>  {
>  	/* Writing 0 to TRCOSLAR unlocks the trace registers */
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
> index 2b51d03ab6d7..f5d708206339 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.h
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.h
> @@ -44,13 +44,13 @@
>  #define TRCVDSACCTLR			0x0A4
>  #define TRCVDARCCTLR			0x0A8
>  /* Derived resources registers */
> -#define TRCSEQEVRn(n)			(0x100 + (n * 4))
> +#define TRCSEQEVRn(n)			(0x100 + (n * 4)) /* n = 0-2 */
>  #define TRCSEQRSTEVR			0x118
>  #define TRCSEQSTR			0x11C
>  #define TRCEXTINSELR			0x120
> -#define TRCCNTRLDVRn(n)			(0x140 + (n * 4))
> -#define TRCCNTCTLRn(n)			(0x150 + (n * 4))
> -#define TRCCNTVRn(n)			(0x160 + (n * 4))
> +#define TRCCNTRLDVRn(n)			(0x140 + (n * 4)) /* n = 0-3 */
> +#define TRCCNTCTLRn(n)			(0x150 + (n * 4)) /* n = 0-3 */
> +#define TRCCNTVRn(n)			(0x160 + (n * 4)) /* n = 0-3 */
>  /* ID registers */
>  #define TRCIDR8				0x180
>  #define TRCIDR9				0x184
> @@ -59,7 +59,7 @@
>  #define TRCIDR12			0x190
>  #define TRCIDR13			0x194
>  #define TRCIMSPEC0			0x1C0
> -#define TRCIMSPECn(n)			(0x1C0 + (n * 4))
> +#define TRCIMSPECn(n)			(0x1C0 + (n * 4)) /* n = 1-7 */
>  #define TRCIDR0				0x1E0
>  #define TRCIDR1				0x1E4
>  #define TRCIDR2				0x1E8
> @@ -68,9 +68,12 @@
>  #define TRCIDR5				0x1F4
>  #define TRCIDR6				0x1F8
>  #define TRCIDR7				0x1FC
> -/* Resource selection registers */
> +/*
> + * Resource selection registers, n = 2-31.
> + * First pair (regs 0, 1) is always present and is reserved.
> + */
>  #define TRCRSCTLRn(n)			(0x200 + (n * 4))
> -/* Single-shot comparator registers */
> +/* Single-shot comparator registers, n = 0-7 */
>  #define TRCSSCCRn(n)			(0x280 + (n * 4))
>  #define TRCSSCSRn(n)			(0x2A0 + (n * 4))
>  #define TRCSSPCICRn(n)			(0x2C0 + (n * 4))
> @@ -80,11 +83,13 @@
>  #define TRCPDCR				0x310
>  #define TRCPDSR				0x314
>  /* Trace registers (0x318-0xEFC) */
> -/* Comparator registers */
> +/* Address Comparator registers n = 0-15 */
>  #define TRCACVRn(n)			(0x400 + (n * 8))
>  #define TRCACATRn(n)			(0x480 + (n * 8))
> +/* Data Value Comparator Value registers, n = 0-7 */
>  #define TRCDVCVRn(n)			(0x500 + (n * 16))
>  #define TRCDVCMRn(n)			(0x580 + (n * 16))
> +/* ContextID/Virtual ContextID comparators, n = 0-7 */

Extra documentation is good but it has to be in a separate patch.

>  #define TRCCIDCVRn(n)			(0x600 + (n * 8))
>  #define TRCVMIDCVRn(n)			(0x640 + (n * 8))
>  #define TRCCIDCCTLR0			0x680
> @@ -120,29 +125,345 @@
>  #define TRCCIDR2			0xFF8
>  #define TRCCIDR3			0xFFC
>  
> -#define etm4x_relaxed_read32(csa, offset)		\
> -	readl_relaxed((csa)->base + (offset))
> +/*
> + * System instructions to access ETM registers.
> + * See ETMv4.4 spec ARM IHI0064F section 4.3.6 System instructions
> + */
> +#define ETM4x_OFFSET_TO_REG(x)		((x) >> 2)
> +
> +#if defined(CONFIG_ARM64)
> +
> +#define ETM4x_CRn(n)			(((n) >> 7) & 0x7)
> +#define ETM4x_Op2(n)			(((n) >> 4) & 0x7)
> +#define ETM4x_CRm(n)			((n) & 0xf)
> +
> +#include <asm/sysreg.h>
> +#define ETM4x_REG_NUM_TO_SYSREG(n)				\
> +	sys_reg(2, 1, ETM4x_CRn(n), ETM4x_CRm(n), ETM4x_Op2(n))
> +
> +#define READ_ETM4x_REG(reg)					\
> +	read_sysreg_s(ETM4x_REG_NUM_TO_SYSREG((reg)))
> +#define WRITE_ETM4x_REG(val, reg)				\
> +	write_sysreg_s(val, ETM4x_REG_NUM_TO_SYSREG((reg)))
>  
> -#define etm4x_read32(csa, offset)			\
> -	readl((csa)->base + (offset))
> +#define read_etm4x_sysreg_const_offset(offset)			\
> +	READ_ETM4x_REG(ETM4x_OFFSET_TO_REG(offset))
>  
> -#define etm4x_relaxed_write32(csa, val, offset)		\
> -	writel_relaxed((val), (csa)->base + (offset))
> +#define write_etm4x_sysreg_const_offset(val, offset)		\
> +	WRITE_ETM4x_REG(val, ETM4x_OFFSET_TO_REG(offset))
>  
> -#define etm4x_write32(csa, val, offset)			\
> -	writel((val), (csa)->base + (offset))
> +#elif defined(CONFIG_ARM)
>  
> -#define etm4x_relaxed_read64(csa, offset)		\
> -	readq_relaxed((csa)->base + (offset))
> +#include <asm/hardware/cp14.h>
>  
> -#define etm4x_read64(csa, offset)			\
> -	readq((csa)->base + (offset))
> +#define etm4x_cp14_CRn(n)		__stringify(ETM4x_CRn(n))
> +#define etm4x_cp14_CRm(n)		__stringify(ETM4x_CRm(n))
> +#define etm4x_cp14_Op2(n)		__stringify(ETM4x_Op2(n))
>  
> -#define etm4x_relaxed_write64(csa, val, offset)		\
> -	writeq_relaxed((val), (csa)->base + (offset))
> +#define READ_ETM4x_REG(reg)				\
> +	MRC14(1, ETM4x_CRn(reg), ETM4x_CRm(reg), ETM4x_Op2(reg))
> +
> +#define read_etm4x_sysreg_const_offset(offset)				\
> +	READ_ETM4x_REG(ETM4x_OFFSET_TO_REG(offset))
> +
> +#define WRITE_ETM4x_REG(val, reg)		\
> +	MCR14((val), 1, ETM4x_CRn((reg)), ETM4x_CRm((reg)), ETM4x_Op2((reg)))
> +
> +#define write_etm4x_sysreg_const_offset(val, offset)		\
> +	WRITE_ETM4x_REG(val, ETM4x_OFFSET_TO_REG(offset))
> +
> +#endif
> +
> +#define CASE_READ(res, x)					\
> +	case (x): { (res) = read_etm4x_sysreg_const_offset((x)); break; }
> +
> +#define CASE_WRITE(val, x)					\
> +	case (x): { write_etm4x_sysreg_const_offset((val), (x)); break; }
> +
> +#define CASE_LIST(op, val)			\
> +	CASE_##op((val), TRCPRGCTLR)		\
> +	CASE_##op((val), TRCPROCSELR)		\
> +	CASE_##op((val), TRCSTATR)		\
> +	CASE_##op((val), TRCCONFIGR)		\
> +	CASE_##op((val), TRCAUXCTLR)		\
> +	CASE_##op((val), TRCEVENTCTL0R)		\
> +	CASE_##op((val), TRCEVENTCTL1R)		\
> +	CASE_##op((val), TRCSTALLCTLR)		\
> +	CASE_##op((val), TRCTSCTLR)		\
> +	CASE_##op((val), TRCSYNCPR)		\
> +	CASE_##op((val), TRCCCCTLR)		\
> +	CASE_##op((val), TRCBBCTLR)		\
> +	CASE_##op((val), TRCTRACEIDR)		\
> +	CASE_##op((val), TRCQCTLR)		\
> +	CASE_##op((val), TRCVICTLR)		\
> +	CASE_##op((val), TRCVIIECTLR)		\
> +	CASE_##op((val), TRCVISSCTLR)		\
> +	CASE_##op((val), TRCVIPCSSCTLR)		\
> +	CASE_##op((val), TRCVDCTLR)		\
> +	CASE_##op((val), TRCVDSACCTLR)		\
> +	CASE_##op((val), TRCVDARCCTLR)		\
> +	CASE_##op((val), TRCSEQEVRn(0))		\
> +	CASE_##op((val), TRCSEQEVRn(1))		\
> +	CASE_##op((val), TRCSEQEVRn(2))		\
> +	CASE_##op((val), TRCSEQRSTEVR)		\
> +	CASE_##op((val), TRCSEQSTR)		\
> +	CASE_##op((val), TRCEXTINSELR)		\
> +	CASE_##op((val), TRCCNTRLDVRn(0))	\
> +	CASE_##op((val), TRCCNTRLDVRn(1))	\
> +	CASE_##op((val), TRCCNTRLDVRn(2))	\
> +	CASE_##op((val), TRCCNTRLDVRn(3))	\
> +	CASE_##op((val), TRCCNTCTLRn(0))	\
> +	CASE_##op((val), TRCCNTCTLRn(1))	\
> +	CASE_##op((val), TRCCNTCTLRn(2))	\
> +	CASE_##op((val), TRCCNTCTLRn(3))	\
> +	CASE_##op((val), TRCCNTVRn(0))		\
> +	CASE_##op((val), TRCCNTVRn(1))		\
> +	CASE_##op((val), TRCCNTVRn(2))		\
> +	CASE_##op((val), TRCCNTVRn(3))		\
> +	CASE_##op((val), TRCIDR8)		\
> +	CASE_##op((val), TRCIDR9)		\
> +	CASE_##op((val), TRCIDR10)		\
> +	CASE_##op((val), TRCIDR11)		\
> +	CASE_##op((val), TRCIDR12)		\
> +	CASE_##op((val), TRCIDR13)		\
> +	CASE_##op((val), TRCIMSPECn(0))		\
> +	CASE_##op((val), TRCIMSPECn(1))		\
> +	CASE_##op((val), TRCIMSPECn(2))		\
> +	CASE_##op((val), TRCIMSPECn(3))		\
> +	CASE_##op((val), TRCIMSPECn(4))		\
> +	CASE_##op((val), TRCIMSPECn(5))		\
> +	CASE_##op((val), TRCIMSPECn(6))		\
> +	CASE_##op((val), TRCIMSPECn(7))		\
> +	CASE_##op((val), TRCIDR0)		\
> +	CASE_##op((val), TRCIDR1)		\
> +	CASE_##op((val), TRCIDR2)		\
> +	CASE_##op((val), TRCIDR3)		\
> +	CASE_##op((val), TRCIDR4)		\
> +	CASE_##op((val), TRCIDR5)		\
> +	CASE_##op((val), TRCIDR6)		\
> +	CASE_##op((val), TRCIDR7)		\
> +	CASE_##op((val), TRCRSCTLRn(2))		\
> +	CASE_##op((val), TRCRSCTLRn(3))		\
> +	CASE_##op((val), TRCRSCTLRn(4))		\
> +	CASE_##op((val), TRCRSCTLRn(5))		\
> +	CASE_##op((val), TRCRSCTLRn(6))		\
> +	CASE_##op((val), TRCRSCTLRn(7))		\
> +	CASE_##op((val), TRCRSCTLRn(8))		\
> +	CASE_##op((val), TRCRSCTLRn(9))		\
> +	CASE_##op((val), TRCRSCTLRn(10))	\
> +	CASE_##op((val), TRCRSCTLRn(11))	\
> +	CASE_##op((val), TRCRSCTLRn(12))	\
> +	CASE_##op((val), TRCRSCTLRn(13))	\
> +	CASE_##op((val), TRCRSCTLRn(14))	\
> +	CASE_##op((val), TRCRSCTLRn(15))	\
> +	CASE_##op((val), TRCRSCTLRn(16))	\
> +	CASE_##op((val), TRCRSCTLRn(17))	\
> +	CASE_##op((val), TRCRSCTLRn(18))	\
> +	CASE_##op((val), TRCRSCTLRn(19))	\
> +	CASE_##op((val), TRCRSCTLRn(20))	\
> +	CASE_##op((val), TRCRSCTLRn(21))	\
> +	CASE_##op((val), TRCRSCTLRn(22))	\
> +	CASE_##op((val), TRCRSCTLRn(23))	\
> +	CASE_##op((val), TRCRSCTLRn(24))	\
> +	CASE_##op((val), TRCRSCTLRn(25))	\
> +	CASE_##op((val), TRCRSCTLRn(26))	\
> +	CASE_##op((val), TRCRSCTLRn(27))	\
> +	CASE_##op((val), TRCRSCTLRn(28))	\
> +	CASE_##op((val), TRCRSCTLRn(29))	\
> +	CASE_##op((val), TRCRSCTLRn(30))	\
> +	CASE_##op((val), TRCRSCTLRn(31))	\
> +	CASE_##op((val), TRCSSCCRn(0))		\
> +	CASE_##op((val), TRCSSCCRn(1))		\
> +	CASE_##op((val), TRCSSCCRn(2))		\
> +	CASE_##op((val), TRCSSCCRn(3))		\
> +	CASE_##op((val), TRCSSCCRn(4))		\
> +	CASE_##op((val), TRCSSCCRn(5))		\
> +	CASE_##op((val), TRCSSCCRn(6))		\
> +	CASE_##op((val), TRCSSCCRn(7))		\
> +	CASE_##op((val), TRCSSCSRn(0))		\
> +	CASE_##op((val), TRCSSCSRn(1))		\
> +	CASE_##op((val), TRCSSCSRn(2))		\
> +	CASE_##op((val), TRCSSCSRn(3))		\
> +	CASE_##op((val), TRCSSCSRn(4))		\
> +	CASE_##op((val), TRCSSCSRn(5))		\
> +	CASE_##op((val), TRCSSCSRn(6))		\
> +	CASE_##op((val), TRCSSCSRn(7))		\
> +	CASE_##op((val), TRCSSPCICRn(0))	\
> +	CASE_##op((val), TRCSSPCICRn(1))	\
> +	CASE_##op((val), TRCSSPCICRn(2))	\
> +	CASE_##op((val), TRCSSPCICRn(3))	\
> +	CASE_##op((val), TRCSSPCICRn(4))	\
> +	CASE_##op((val), TRCSSPCICRn(5))	\
> +	CASE_##op((val), TRCSSPCICRn(6))	\
> +	CASE_##op((val), TRCSSPCICRn(7))	\
> +	CASE_##op((val), TRCOSLAR)		\
> +	CASE_##op((val), TRCOSLSR)		\
> +	CASE_##op((val), TRCPDCR)		\
> +	CASE_##op((val), TRCPDSR)		\
> +	CASE_##op((val), TRCACVRn(0))		\
> +	CASE_##op((val), TRCACVRn(1))		\
> +	CASE_##op((val), TRCACVRn(2))		\
> +	CASE_##op((val), TRCACVRn(3))		\
> +	CASE_##op((val), TRCACVRn(4))		\
> +	CASE_##op((val), TRCACVRn(5))		\
> +	CASE_##op((val), TRCACVRn(6))		\
> +	CASE_##op((val), TRCACVRn(7))		\
> +	CASE_##op((val), TRCACVRn(8))		\
> +	CASE_##op((val), TRCACVRn(9))		\
> +	CASE_##op((val), TRCACVRn(10))		\
> +	CASE_##op((val), TRCACVRn(11))		\
> +	CASE_##op((val), TRCACVRn(12))		\
> +	CASE_##op((val), TRCACVRn(13))		\
> +	CASE_##op((val), TRCACVRn(14))		\
> +	CASE_##op((val), TRCACVRn(15))		\
> +	CASE_##op((val), TRCACATRn(0))		\
> +	CASE_##op((val), TRCACATRn(1))		\
> +	CASE_##op((val), TRCACATRn(2))		\
> +	CASE_##op((val), TRCACATRn(3))		\
> +	CASE_##op((val), TRCACATRn(4))		\
> +	CASE_##op((val), TRCACATRn(5))		\
> +	CASE_##op((val), TRCACATRn(6))		\
> +	CASE_##op((val), TRCACATRn(7))		\
> +	CASE_##op((val), TRCACATRn(8))		\
> +	CASE_##op((val), TRCACATRn(9))		\
> +	CASE_##op((val), TRCACATRn(10))		\
> +	CASE_##op((val), TRCACATRn(11))		\
> +	CASE_##op((val), TRCACATRn(12))		\
> +	CASE_##op((val), TRCACATRn(13))		\
> +	CASE_##op((val), TRCACATRn(14))		\
> +	CASE_##op((val), TRCACATRn(15))		\
> +	CASE_##op((val), TRCDVCVRn(0))		\
> +	CASE_##op((val), TRCDVCVRn(1))		\
> +	CASE_##op((val), TRCDVCVRn(2))		\
> +	CASE_##op((val), TRCDVCVRn(3))		\
> +	CASE_##op((val), TRCDVCVRn(4))		\
> +	CASE_##op((val), TRCDVCVRn(5))		\
> +	CASE_##op((val), TRCDVCVRn(6))		\
> +	CASE_##op((val), TRCDVCVRn(7))		\
> +	CASE_##op((val), TRCDVCMRn(0))		\
> +	CASE_##op((val), TRCDVCMRn(1))		\
> +	CASE_##op((val), TRCDVCMRn(2))		\
> +	CASE_##op((val), TRCDVCMRn(3))		\
> +	CASE_##op((val), TRCDVCMRn(4))		\
> +	CASE_##op((val), TRCDVCMRn(5))		\
> +	CASE_##op((val), TRCDVCMRn(6))		\
> +	CASE_##op((val), TRCDVCMRn(7))		\
> +	CASE_##op((val), TRCCIDCVRn(0))		\
> +	CASE_##op((val), TRCCIDCVRn(1))		\
> +	CASE_##op((val), TRCCIDCVRn(2))		\
> +	CASE_##op((val), TRCCIDCVRn(3))		\
> +	CASE_##op((val), TRCCIDCVRn(4))		\
> +	CASE_##op((val), TRCCIDCVRn(5))		\
> +	CASE_##op((val), TRCCIDCVRn(6))		\
> +	CASE_##op((val), TRCCIDCVRn(7))		\
> +	CASE_##op((val), TRCVMIDCVRn(0))	\
> +	CASE_##op((val), TRCVMIDCVRn(1))	\
> +	CASE_##op((val), TRCVMIDCVRn(2))	\
> +	CASE_##op((val), TRCVMIDCVRn(3))	\
> +	CASE_##op((val), TRCVMIDCVRn(4))	\
> +	CASE_##op((val), TRCVMIDCVRn(5))	\
> +	CASE_##op((val), TRCVMIDCVRn(6))	\
> +	CASE_##op((val), TRCVMIDCVRn(7))	\
> +	CASE_##op((val), TRCCIDCCTLR0)		\
> +	CASE_##op((val), TRCCIDCCTLR1)		\
> +	CASE_##op((val), TRCVMIDCCTLR0)		\
> +	CASE_##op((val), TRCVMIDCCTLR1)		\
> +	CASE_##op((val), TRCITCTRL)		\
> +	CASE_##op((val), TRCCLAIMSET)		\
> +	CASE_##op((val), TRCCLAIMCLR)		\
> +	CASE_##op((val), TRCDEVAFF0)		\
> +	CASE_##op((val), TRCDEVAFF1)		\
> +	CASE_##op((val), TRCLAR)		\
> +	CASE_##op((val), TRCLSR)		\
> +	CASE_##op((val), TRCAUTHSTATUS)		\
> +	CASE_##op((val), TRCDEVARCH)		\
> +	CASE_##op((val), TRCDEVID)		\
> +	CASE_##op((val), TRCDEVTYPE)		\
> +	CASE_##op((val), TRCPIDR4)		\
> +	CASE_##op((val), TRCPIDR5)		\
> +	CASE_##op((val), TRCPIDR6)		\
> +	CASE_##op((val), TRCPIDR7)		\
> +	CASE_##op((val), TRCPIDR0)		\
> +	CASE_##op((val), TRCPIDR1)		\
> +	CASE_##op((val), TRCPIDR2)		\
> +	CASE_##op((val), TRCPIDR3)
> +
> +#define ETM4x_READ_CASES(res)	CASE_LIST(READ, (res))
> +#define ETM4x_WRITE_CASES(val)	CASE_LIST(WRITE, (val))
> +
> +#define __read_etm4x_sysreg_offset(csa, offset, _64bit)				\
> +	({									\
> +		u64 __val;							\
> +										\
> +		if (__builtin_constant_p((offset)))				\
> +			__val = read_etm4x_sysreg_const_offset((offset));	\
> +		else								\
> +			__val = etm4x_sysreg_read((csa), (offset),		\
> +						  true, _64bit);		\
> +		__val;								\
> +	 })
> +
> +#define __write_etm4x_sysreg_offset(csa, val, offset, _64bit)		\
> +	do {								\
> +		if (__builtin_constant_p((offset)))			\
> +			write_etm4x_sysreg_const_offset((val),		\
> +							(offset));	\
> +		else							\
> +			etm4x_sysreg_write((csa), (val), (offset),	\
> +						true, _64bit);		\
> +	} while (0)
> +
> +
> +#define etm4x_relaxed_read32(csa, offset)				\
> +	(u32)(!(csa)->no_iomem ?					\
> +		 readl_relaxed((csa)->base + (offset)) :		\
> +		 __read_etm4x_sysreg_offset((csa), (offset), false))
> +#define etm4x_relaxed_read64(csa, offset)				\
> +	(u64)(!(csa)->no_iomem ?					\
> +		 readq_relaxed((csa)->base + (offset)) :		\
> +		 __read_etm4x_sysreg_offset((csa), (offset), true))
> +#define etm4x_read32(csa, offset)					\
> +	({								\
> +		mb(); /* enforce order */				\
> +		etm4x_relaxed_read32((csa), (offset));			\
> +	 })
> +
> +#define etm4x_read64(csa, offset)					\
> +	({								\
> +		mb(); /* enforce order */				\
> +		etm4x_relaxed_read64((csa), (offset));			\
> +	 })
> +
> +#define etm4x_relaxed_write32(csa, val, offset)				\
> +	do {								\
> +		if (!(csa)->no_iomem)					\
> +			writel_relaxed((val), (csa)->base + (offset));	\
> +		else							\
> +			__write_etm4x_sysreg_offset((csa), (val),	\
> +						    (offset), false);	\
> +	} while (0)
> +
> +#define etm4x_relaxed_write64(csa, val, offset)				\
> +	do {								\
> +		if (!(csa)->no_iomem)					\
> +			writeq_relaxed((val), (csa)->base + (offset));	\
> +		else							\
> +			__write_etm4x_sysreg_offset((csa), (val),	\
> +						    (offset), true);	\
> +	} while (0)
> +
> +#define etm4x_write32(csa, val, offset)					\
> +	do {								\
> +		mb(); /* enforce order */				\
> +		etm4x_relaxed_write32((csa), (val), (offset));		\
> +	} while (0)
> +
> +#define etm4x_write64(csa, val, offset)					\
> +	do {								\
> +		mb(); /* enforce order */				\
> +		etm4x_relaxed_write64((csa), (val), (offset));		\
> +	} while (0)
>  
> -#define etm4x_write64(csa, val, offset)			\
> -	writeq((val), (csa)->base + (offset))
>  
>  /* ETMv4 resources */
>  #define ETM_MAX_NR_PE			8
> @@ -501,4 +822,14 @@ enum etm_addr_ctxtype {
>  
>  extern const struct attribute_group *coresight_etmv4_groups[];
>  void etm4_config_trace_mode(struct etmv4_config *config);
> +
> +u64 etm4x_sysreg_read(struct csdev_access *csa,
> +		      u32 offset,
> +		      bool _relaxed,
> +		      bool _64bit);
> +void etm4x_sysreg_write(struct csdev_access *csa,
> +			u64 val,
> +			u32 offset,
> +			bool _relaxed,
> +			bool _64bit);
>  #endif
> -- 
> 2.24.1
> 

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Re: [RFC PATCH 09/14] coresight: etm4x: Add sysreg access helpers

[Suzuki K Poulose]

On 07/30/2020 10:41 PM, Mathieu Poirier wrote:
> On Wed, Jul 22, 2020 at 06:20:35PM +0100, Suzuki K Poulose wrote:
>> ETMv4.4 architecture defines the system instructions for accessing
>> ETM via register accesses. Add basic support for accessing a given
>> register via system instructions.
>>
>> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
>> Cc: Mike Leach <mike.leach@linaro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-etm4x.c |  39 ++
>>   drivers/hwtracing/coresight/coresight-etm4x.h | 379 ++++++++++++++++--
>>   2 files changed, 394 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c


>>   static void etm4_os_unlock_csa(struct etmv4_drvdata *drvdata, struct csdev_access *csa)
>>   {
>>   	/* Writing 0 to TRCOSLAR unlocks the trace registers */
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
>> index 2b51d03ab6d7..f5d708206339 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x.h
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x.h

		0x1FC
>> -/* Resource selection registers */
>> +/*
>> + * Resource selection registers, n = 2-31.
>> + * First pair (regs 0, 1) is always present and is reserved.
>> + */
>>   #define TRCRSCTLRn(n)			(0x200 + (n * 4))
>> -/* Single-shot comparator registers */
>> +/* Single-shot comparator registers, n = 0-7 */
>>   #define TRCSSCCRn(n)			(0x280 + (n * 4))
>>   #define TRCSSCSRn(n)			(0x2A0 + (n * 4))
>>   #define TRCSSPCICRn(n)			(0x2C0 + (n * 4))
>> @@ -80,11 +83,13 @@
>>   #define TRCPDCR				0x310
>>   #define TRCPDSR				0x314
>>   /* Trace registers (0x318-0xEFC) */
>> -/* Comparator registers */
>> +/* Address Comparator registers n = 0-15 */
>>   #define TRCACVRn(n)			(0x400 + (n * 8))
>>   #define TRCACATRn(n)			(0x480 + (n * 8))
>> +/* Data Value Comparator Value registers, n = 0-7 */
>>   #define TRCDVCVRn(n)			(0x500 + (n * 16))
>>   #define TRCDVCMRn(n)			(0x580 + (n * 16))
>> +/* ContextID/Virtual ContextID comparators, n = 0-7 */
> 
> Extra documentation is good but it has to be in a separate patch.
> 

Sure, will split this. It was partly for making sure that I don't
miss a case for a register in the list.

Cheers
Suzuki


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[RFC PATCH 10/14] coresight: etm4x: Define DEVARCH register fields

[Suzuki K Poulose]

Define the fields of the DEVARCH register for identifying
a component as an ETMv4.x unit.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x.c |  4 ++--
 drivers/hwtracing/coresight/coresight-etm4x.h | 16 ++++++++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index e37aababa4c9..776a59f62710 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1624,8 +1624,8 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 static struct amba_cs_uci_id uci_id_etm4[] = {
 	{
 		/*  ETMv4 UCI data */
-		.devarch	= 0x47704a13,
-		.devarch_mask	= 0xfff0ffff,
+		.devarch	= ETM_DEVARCH_ETMv4x_ARCH,
+		.devarch_mask	= ETM_DEVARCH_ID_MASK,
 		.devtype	= 0x00000013,
 	}
 };
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index f5d708206339..ab3d1c195387 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -519,6 +519,22 @@
 					 ETM_MODE_EXCL_KERN | \
 					 ETM_MODE_EXCL_USER)
 
+#define ETM_DEVARCH_ARCHITECT_MASK		GENMASK(31, 21)
+#define ETM_DEVARCH_ARCHITECT_ARM		((0x4 << 28) | (0b0111011 << 21))
+#define ETM_DEVARCH_PRESENT			BIT(20)
+#define ETM_DEVARCH_ARCHID_MASK			GENMASK(15, 0)
+#define ETM_DEVARCH_ARCHID_ARCH_VER_SHIFT	12
+#define ETM_DEVARCH_ARCHID_ARCH_VER(x)		\
+	(((x) & 0xfUL) << ETM_DEVARCH_ARCHID_ARCH_VER_SHIFT)
+#define ETM_DEVARCH_ARCHID_ARCH_PART(x)		((x) & 0xfffUL)
+#define ETM_DEVARCH_ARCHID_ETMv4		\
+	(ETM_DEVARCH_ARCHID_ARCH_VER(4) | ETM_DEVARCH_ARCHID_ARCH_PART(0xA13))
+
+#define ETM_DEVARCH_ID_MASK						\
+	(ETM_DEVARCH_ARCHITECT_MASK | ETM_DEVARCH_ARCHID_MASK | ETM_DEVARCH_PRESENT)
+#define ETM_DEVARCH_ETMv4x_ARCH						\
+	(ETM_DEVARCH_ARCHITECT_ARM | ETM_DEVARCH_ARCHID_ETMv4 | ETM_DEVARCH_PRESENT)
+
 #define TRCSTATR_IDLE_BIT		0
 #define TRCSTATR_PMSTABLE_BIT		1
 #define ETM_DEFAULT_ADDR_COMP		0
-- 
2.24.1


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[RFC PATCH 11/14] coresight: etm4x: Detect system register access support

[Suzuki K Poulose]

Check if the etm4x supports system register access and use
it instead of the memory mapped IO.

We need to detect that :
 a) The CPU implements system register access to the Trace unit
	AND
 b) The trace unit is an ETMv4.x component.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x.c | 76 +++++++++++++++----
 drivers/hwtracing/coresight/coresight-etm4x.h | 16 ++++
 2 files changed, 78 insertions(+), 14 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 776a59f62710..831206f7f306 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -19,6 +19,7 @@
 #include <linux/clk.h>
 #include <linux/cpu.h>
 #include <linux/cpu_pm.h>
+#include <linux/cpumask.h>
 #include <linux/coresight.h>
 #include <linux/coresight-pmu.h>
 #include <linux/pm_wakeup.h>
@@ -1507,9 +1508,43 @@ static void etm4_pm_clear(void)
 	}
 }
 
+static inline bool trace_unit_is_etmv4(u32 devarch)
+{
+	return (devarch & ETM_DEVARCH_ID_MASK) == ETM_DEVARCH_ETMv4x_ARCH;
+}
+
+static void etm4_check_sysreg_access(void *arg)
+{
+	bool *status = arg;
+	u32 devarch;
+
+	if (!arch_cpu_supports_sysreg_trace()) {
+		*status = false;
+		return;
+	}
+
+	devarch = read_etm4x_sysreg_const_offset(TRCDEVARCH);
+	if (!trace_unit_is_etmv4(devarch)) {
+		*status = false;
+		return;
+	}
+
+	*status = true;
+}
+
+static bool etm4_cpu_supports_sysreg(int cpu)
+{
+	bool sys_reg_support = false;
+
+	smp_call_function_single(cpu, etm4_check_sysreg_access, &sys_reg_support, 1);
+
+	return sys_reg_support;
+}
+
 static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 {
-	int ret;
+	int ret, cpu;
+	bool sys_reg = false;
 	void __iomem *base;
 	struct device *dev = &adev->dev;
 	struct coresight_platform_data *pdata = NULL;
@@ -1517,10 +1552,17 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
 
+	cpu = coresight_get_cpu(dev);
+	if (cpu < 0 || !cpu_online(cpu))
+		return -EPROBE_DEFER;
+
+	sys_reg = etm4_cpu_supports_sysreg(cpu);
+
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 
+	drvdata->cpu = cpu;
 	dev_set_drvdata(dev, drvdata);
 
 	if (pm_save_enable == PARAM_PM_SAVE_FIRMWARE)
@@ -1537,26 +1579,30 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	if (fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up"))
 		drvdata->skip_power_up = true;
 
-	/* Validity for the resource is already checked by the AMBA core */
-	base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(base))
-		return PTR_ERR(base);
-
-	drvdata->base = base;
-	desc.access.base = base;
+	if (sys_reg) {
+		desc.access = (struct csdev_access){
+			.no_iomem = true,
+			.read = etm4x_sysreg_read,
+			.write = etm4x_sysreg_write,
+		};
+	} else {
+		/* Validity for the resource is already checked by the AMBA core */
+		base = devm_ioremap_resource(dev, res);
+		if (IS_ERR(base))
+			return PTR_ERR(base);
+
+		drvdata->base = base;
+		desc.access.base = base;
+	}
 
 	spin_lock_init(&drvdata->spinlock);
 
-	drvdata->cpu = coresight_get_cpu(dev);
-	if (drvdata->cpu < 0)
-		return drvdata->cpu;
-
 	desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
 	if (!desc.name)
 		return -ENOMEM;
 
 	cpus_read_lock();
-	etmdrvdata[drvdata->cpu] = drvdata;
+	etmdrvdata[cpu] = drvdata;
 
 	if (smp_call_function_single(drvdata->cpu,
 				etm4_init_arch_data,  &desc.access, 1))
@@ -1607,6 +1653,8 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	pm_runtime_put(&adev->dev);
 	dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n",
 		 drvdata->cpu, drvdata->arch >> 4, drvdata->arch & 0xf);
+	if (sys_reg)
+		dev_info(&drvdata->csdev->dev, "Using system register accesses\n");
 
 	if (boot_enable) {
 		coresight_enable(drvdata->csdev);
@@ -1616,7 +1664,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	return 0;
 
 err_arch_supported:
-	etmdrvdata[drvdata->cpu] = NULL;
+	etmdrvdata[cpu] = NULL;
 	etm4_pm_clear();
 	return ret;
 }
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index ab3d1c195387..86fdcbafc895 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -152,6 +152,13 @@
 #define write_etm4x_sysreg_const_offset(val, offset)		\
 	WRITE_ETM4x_REG(val, ETM4x_OFFSET_TO_REG(offset))
 
+static inline bool arch_cpu_supports_sysreg_trace(void)
+{
+	u64 dfr0 = read_sysreg_s(SYS_ID_AA64DFR0_EL1);
+
+	return ((dfr0 >> ID_AA64DFR0_TRACEVER_SHIFT) & 0xfUL) > 0;
+}
+
 #elif defined(CONFIG_ARM)
 
 #include <asm/hardware/cp14.h>
@@ -172,6 +179,15 @@
 #define write_etm4x_sysreg_const_offset(val, offset)		\
 	WRITE_ETM4x_REG(val, ETM4x_OFFSET_TO_REG(offset))
 
+#define ID_DFR0_CopTrc_SHIFT	12
+static inline bool arch_cpu_supports_sysreg_trace(void)
+{
+	u32 dfr0;
+
+	asm volatile("mrc p15, 0, %0, c0, c1, 2" : "=r" (dfr0));
+
+	return ((dfr0 >> ID_DFR0_CopTrc_SHIFT) & 0xfUL) > 0;
+}
 #endif
 
 #define CASE_READ(res, x)					\
-- 
2.24.1


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[RFC PATCH 12/14] coresight: etm4x: Refactor probing routine

[Suzuki K Poulose]

CoreSight ETM with system register access may not have a
memory mapped i/o access. Refactor the ETM specific probing
into a common routine to allow reusing the code for such ETMs.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x.c | 64 ++++++++++++-------
 1 file changed, 41 insertions(+), 23 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 831206f7f306..e91af23ac419 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1541,27 +1541,43 @@ static bool etm4_cpu_supports_sysreg(int cpu)
 	return sys_reg_support;
 }
 
-static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
+static int etm4_probe_common(struct device *dev, void __iomem *base)
 {
 	int ret, cpu;
 	bool sys_reg = false;
-	void __iomem *base;
-	struct device *dev = &adev->dev;
 	struct coresight_platform_data *pdata = NULL;
 	struct etmv4_drvdata *drvdata;
-	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
 
+	cpu = coresight_get_cpu(dev);
+	if (cpu < 0)
+		return cpu;
+
 	cpu = coresight_get_cpu(dev);
 	if (cpu < 0 || !cpu_online(cpu))
 		return -EPROBE_DEFER;
 
 	sys_reg = etm4_cpu_supports_sysreg(cpu);
+	if (sys_reg) {
+		desc.access = (struct csdev_access){
+			.no_iomem = true,
+			.read = etm4x_sysreg_read,
+			.write = etm4x_sysreg_write,
+		};
+	} else if (base) {
+		desc.access.base = base;
+	} else {
+		dev_crit(dev, "etm4x: Unable to detect access\n");
+		return -ENODEV;
+	}
+
+
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 
+	drvdata->base = base;
 	drvdata->cpu = cpu;
 	dev_set_drvdata(dev, drvdata);
 
@@ -1579,22 +1595,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	if (fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up"))
 		drvdata->skip_power_up = true;
 
-	if (sys_reg) {
-		desc.access = (struct csdev_access){
-			.no_iomem = true,
-			.read = etm4x_sysreg_read,
-			.write = etm4x_sysreg_write,
-		};
-	} else {
-		/* Validity for the resource is already checked by the AMBA core */
-		base = devm_ioremap_resource(dev, res);
-		if (IS_ERR(base))
-			return PTR_ERR(base);
-
-		drvdata->base = base;
-		desc.access.base = base;
-	}
-
 	spin_lock_init(&drvdata->spinlock);
 
 	desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
@@ -1630,7 +1630,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 		ret = PTR_ERR(pdata);
 		goto err_arch_supported;
 	}
-	adev->dev.platform_data = pdata;
+	dev->platform_data = pdata;
 
 	desc.type = CORESIGHT_DEV_TYPE_SOURCE;
 	desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
@@ -1650,7 +1650,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 		goto err_arch_supported;
 	}
 
-	pm_runtime_put(&adev->dev);
 	dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n",
 		 drvdata->cpu, drvdata->arch >> 4, drvdata->arch & 0xf);
 	if (sys_reg)
@@ -1669,6 +1668,25 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	return ret;
 }
 
+static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id)
+{
+	void __iomem *base;
+	struct device *dev = &adev->dev;
+	struct resource *res = &adev->res;
+	int ret;
+
+	/* Validity for the resource is already checked by the AMBA core */
+	base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	ret = etm4_probe_common(dev, base);
+	if (!ret)
+		pm_runtime_put(&adev->dev);
+
+	return ret;
+}
+
 static struct amba_cs_uci_id uci_id_etm4[] = {
 	{
 		/*  ETMv4 UCI data */
@@ -1700,7 +1718,7 @@ static struct amba_driver etm4x_driver = {
 		.name   = "coresight-etm4x",
 		.suppress_bind_attrs = true,
 	},
-	.probe		= etm4_probe,
+	.probe		= etm4_probe_amba,
 	.id_table	= etm4_ids,
 };
 builtin_amba_driver(etm4x_driver);
-- 
2.24.1


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[RFC PATCH 13/14] coresight: etm4x: Add support for sysreg only devices

[Suzuki K Poulose]

Add support for etms without memory mapped access.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x.c | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index e91af23ac419..88ec89629507 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -27,6 +27,7 @@
 #include <linux/seq_file.h>
 #include <linux/uaccess.h>
 #include <linux/perf_event.h>
+#include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <asm/sections.h>
@@ -1687,6 +1688,11 @@ static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id)
 	return ret;
 }
 
+static int etm4_4_probe(struct platform_device *pdev)
+{
+	return etm4_probe_common(&pdev->dev, NULL);
+}
+
 static struct amba_cs_uci_id uci_id_etm4[] = {
 	{
 		/*  ETMv4 UCI data */
@@ -1722,3 +1728,18 @@ static struct amba_driver etm4x_driver = {
 	.id_table	= etm4_ids,
 };
 builtin_amba_driver(etm4x_driver);
+
+static const struct of_device_id etm4_4_match[] = {
+	{ .compatible	= "arm,coresight-etm-v4.4" },
+	{}
+};
+
+static struct platform_driver etm4_4_driver = {
+	.probe		= etm4_4_probe,
+	.driver			= {
+		.name			= "coresight-etm4x",
+		.of_match_table		= etm4_4_match,
+		.suppress_bind_attrs	= true,
+	},
+};
+builtin_platform_driver(etm4_4_driver);
-- 
2.24.1


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[RFC PATCH 14/14] dts: bindings: coresight: ETMv4.4 system register access only units

[Suzuki K Poulose]

Document the bindings for ETMv4.4 and later with only system register
access.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 Documentation/devicetree/bindings/arm/coresight.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
index d711676b4a51..cfe47bdda728 100644
--- a/Documentation/devicetree/bindings/arm/coresight.txt
+++ b/Documentation/devicetree/bindings/arm/coresight.txt
@@ -34,9 +34,13 @@ its hardware characteristcs.
 					Program Flow Trace Macrocell:
 			"arm,coresight-etm3x", "arm,primecell";
 
-		- Embedded Trace Macrocell (version 4.x):
+		- Embedded Trace Macrocell (version 4.x), with memory mapped access.
 			"arm,coresight-etm4x", "arm,primecell";
 
+		- Embedded Trace Macrocell (version 4.4 and later) with system
+		  register access only.
+			"arm,coresight-etm-v4.4";
+
 		- Coresight programmable Replicator :
 			"arm,coresight-dynamic-replicator", "arm,primecell";
 
-- 
2.24.1


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Re: [RFC PATCH 14/14] dts: bindings: coresight: ETMv4.4 system register access only units

[Rob Herring]

On Wed, 22 Jul 2020 18:20:40 +0100, Suzuki K Poulose wrote:
> Document the bindings for ETMv4.4 and later with only system register
> access.
> 
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  Documentation/devicetree/bindings/arm/coresight.txt | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

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Re: [RFC PATCH 14/14] dts: bindings: coresight: ETMv4.4 system register access only units

[Mathieu Poirier]

On Wed, Jul 22, 2020 at 06:20:40PM +0100, Suzuki K Poulose wrote:
> Document the bindings for ETMv4.4 and later with only system register
> access.
> 
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Mike Leach <mike.leach@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  Documentation/devicetree/bindings/arm/coresight.txt | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
> index d711676b4a51..cfe47bdda728 100644
> --- a/Documentation/devicetree/bindings/arm/coresight.txt
> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> @@ -34,9 +34,13 @@ its hardware characteristcs.
>  					Program Flow Trace Macrocell:
>  			"arm,coresight-etm3x", "arm,primecell";
>  
> -		- Embedded Trace Macrocell (version 4.x):
> +		- Embedded Trace Macrocell (version 4.x), with memory mapped access.
>  			"arm,coresight-etm4x", "arm,primecell";
>  
> +		- Embedded Trace Macrocell (version 4.4 and later) with system
> +		  register access only.
> +			"arm,coresight-etm-v4.4";

I would rather call this "arm,coresight-etm-v4.4+" so that the binding's
semantic is still relevant when dealing with ETM v4.5 and onward. 

Thanks,
Mathieu

> +
>  		- Coresight programmable Replicator :
>  			"arm,coresight-dynamic-replicator", "arm,primecell";
>  
> -- 
> 2.24.1
> 

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Re: [RFC PATCH 14/14] dts: bindings: coresight: ETMv4.4 system register access only units

[Suzuki K Poulose]

On 07/29/2020 06:20 PM, Mathieu Poirier wrote:
> On Wed, Jul 22, 2020 at 06:20:40PM +0100, Suzuki K Poulose wrote:
>> Document the bindings for ETMv4.4 and later with only system register
>> access.
>>
>> Cc: Rob Herring <robh+dt@kernel.org>
>> Cc: devicetree@vger.kernel.org
>> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
>> Cc: Mike Leach <mike.leach@linaro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> ---
>>   Documentation/devicetree/bindings/arm/coresight.txt | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
>> index d711676b4a51..cfe47bdda728 100644
>> --- a/Documentation/devicetree/bindings/arm/coresight.txt
>> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
>> @@ -34,9 +34,13 @@ its hardware characteristcs.
>>   					Program Flow Trace Macrocell:
>>   			"arm,coresight-etm3x", "arm,primecell";
>>   
>> -		- Embedded Trace Macrocell (version 4.x):
>> +		- Embedded Trace Macrocell (version 4.x), with memory mapped access.
>>   			"arm,coresight-etm4x", "arm,primecell";
>>   
>> +		- Embedded Trace Macrocell (version 4.4 and later) with system
>> +		  register access only.
>> +			"arm,coresight-etm-v4.4";
> 
> I would rather call this "arm,coresight-etm-v4.4+" so that the binding's
> semantic is still relevant when dealing with ETM v4.5 and onward.

AFAIUC, "compatible" stands for something that is compatible with v4.4.
All v4.4+ versions that are compatible with v4.4 are covered here.
Having said that I am fine with "arm,coresight-etm-v4.4+" , if it
is fine by the DT conventions.

Cheers
Suzuki

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Re: [RFC PATCH 14/14] dts: bindings: coresight: ETMv4.4 system register access only units

[Mathieu Poirier]

On Thu, Jul 30, 2020 at 05:38:37PM +0100, Suzuki K Poulose wrote:
> On 07/29/2020 06:20 PM, Mathieu Poirier wrote:
> > On Wed, Jul 22, 2020 at 06:20:40PM +0100, Suzuki K Poulose wrote:
> > > Document the bindings for ETMv4.4 and later with only system register
> > > access.
> > > 
> > > Cc: Rob Herring <robh+dt@kernel.org>
> > > Cc: devicetree@vger.kernel.org
> > > Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> > > Cc: Mike Leach <mike.leach@linaro.org>
> > > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> > > ---
> > >   Documentation/devicetree/bindings/arm/coresight.txt | 6 +++++-
> > >   1 file changed, 5 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
> > > index d711676b4a51..cfe47bdda728 100644
> > > --- a/Documentation/devicetree/bindings/arm/coresight.txt
> > > +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> > > @@ -34,9 +34,13 @@ its hardware characteristcs.
> > >   					Program Flow Trace Macrocell:
> > >   			"arm,coresight-etm3x", "arm,primecell";
> > > -		- Embedded Trace Macrocell (version 4.x):
> > > +		- Embedded Trace Macrocell (version 4.x), with memory mapped access.
> > >   			"arm,coresight-etm4x", "arm,primecell";
> > > +		- Embedded Trace Macrocell (version 4.4 and later) with system
> > > +		  register access only.
> > > +			"arm,coresight-etm-v4.4";
> > 
> > I would rather call this "arm,coresight-etm-v4.4+" so that the binding's
> > semantic is still relevant when dealing with ETM v4.5 and onward.
> 
> AFAIUC, "compatible" stands for something that is compatible with v4.4.
> All v4.4+ versions that are compatible with v4.4 are covered here.

Your position is valid - let's to with what you had.

> Having said that I am fine with "arm,coresight-etm-v4.4+" , if it
> is fine by the DT conventions.
> 
> Cheers
> Suzuki

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