[PATCH v4 00/30] coresight: Support for ACPI bindings

[PATCH v4 00/30] coresight: Support for ACPI bindings

[Suzuki K Poulose]

This series adds the support for CoreSight devices on ACPI based
platforms. The device connections are encoded as _DSD graph property[0],
with CoreSight specific extensions to indicate the direction of data
flow as described in [1]. Components attached to CPUs are listed
as child devices of the corresponding CPU, removing explicit links
to the CPU like we do in the DT.

The majority of the series cleans up the driver and prepares the subsystem
for platform agnostic firwmare probing, naming scheme, searching etc.

We introduce platform independent helpers to parse the platform supplied
information. Thus we rename the platform handling code from:
	of_coresight.c  => coresight-platform.c

The CoreSight driver creates shadow devices that appear on the Coresight
bus, in addition to the real devices (e.g, AMBA bus devices). The name
of these devices match the real device. This makes the device name
a bit cryptic for ACPI platform. So this series also introduces a generic
platform agnostic device naming scheme for the shadow Coresight devices.
Towards this we also make changes to the way we lookup devices to resolve
the connections, as we can't use the names to identify the devices. So,
we use the "fwnode_handle" of the real device for the device lookups.
Towards that we clean up the drivers to keep track of the "CoreSight"
device rather than the "real" device. However, all real operations,
like DMA allocation, Power management etc. must be performed on
the real device which is the parent of the shadow device.

Finally we add the support for parsing the ACPI platform data. The power
management support is missing in the ACPI (and this is not specific to
CoreSight). The firmware must ensure that the respective power domains
are turned on.

Applies on v5.2-rc1

Tested on a Juno-r0 board with ACPI bindings patch (Patch 31/30) added on
top of [2]. You would need to make sure that the debug power domain is
turned on before the Linux kernel boots. (e.g, connect the DS-5 to the
Juno board while at UEFI). arm32 code is only compile tested.

[0] ACPI Device Graphs using _DSD (Not available online yet, approved but
    awaiting publish and eventually should be linked at).
    https://uefi.org/sites/default/files/resources/_DSD-implementation-guide-toplevel-1_1.htm
[1] https://developer.arm.com/docs/den0067/latest/acpi-for-coresighttm-10-platform-design-document
[2] https://github.com/tianocore/edk2-platforms.git

Changes since v3:
 - Add tags from Mathieu

Changes since v2:
 - Fix the symlink name for ETM devices under cs_etm PMU (Patch by Mathieu)
 - Drop patches merged already in the tree.
 - Add the tags from Mathieu
 - More documentation with examples of ACPI graph in ACPI bindings support.
 - Fix ETM4 error return path (Mathieu)
 - Drop the patches exposing device links via sysfs, to be posted as separate
   series.
 - Drop the generic helper for device search by fwnode for a better cleanup
   later.
 - Split the ACPI bindings support patch for AMBA and platform devices.
 - Return integer error for <platform>_get_platform_data() helpers.
 - Fix comment about the return code for acpi_get_coresight_cpu().
 - Ensure we don't have devices part of multiple graphs (Mathieu).

Changes since v1:

 [ http://lists.infradead.org/pipermail/linux-arm-kernel/2019-March/639963.html ]

  - Dropped the replicator driver merge changes as they were pulled already.
  - Cleanups for Power management in the drivers.
  - Reuse platform description for connection information. Also introduce
    routines to clean up the platform description to make sure we drop
    the references (fwnode_handle).
  - Add RFC patches for exposing the device-links via sysfs.
  - Drop tracking the device in favour of coresight_device.
  - Name etb10 as "etb"
  - Fix other comments in v1.
  - Use a generic helper for searching with fwnode_handle rather than adding
    one for CoreSight.


Mathieu Poirier (1):
  coresight: Use coresight device names for sinks in PMU attribute

Suzuki K Poulose (29):
  coresight: funnel: Clean up device book keeping
  coresight: replicator: Cleanup device tracking
  coresight: tmc: Clean up device specific data
  coresight: catu: Cleanup device specific data
  coresight: tpiu: Clean up device specific data
  coresight: stm: Cleanup device specific data
  coresight: etm: Clean up device specific data
  coresight: etb10: Clean up device specific data
  coresight: Rename of_coresight to coresight-platform
  coresight: etm3x: Rearrange cp14 access detection
  coresight: stm: Rearrange probing the stimulus area
  coresight: tmc-etr: Rearrange probing default buffer size
  coresight: platform: Make memory allocation helper generic
  coresight: Make sure device uses DT for obsolete compatible check
  coresight: Introduce generic platform data helper
  coresight: Make device to CPU mapping generic
  coresight: Remove cpu field from platform data
  coresight: Remove name from platform description
  coresight: Cleanup coresight_remove_conns
  coresight: Reuse platform data structure for connection tracking
  coresight: Rearrange platform data probing
  coresight: Add support for releasing platform specific data
  coresight: platform: Use fwnode handle for device search
  coresight: Use fwnode handle instead of device names
  coresight: Use platform agnostic names
  coresight: stm: ACPI support for parsing stimulus base
  coresight: Support for ACPI bindings
  coresight: acpi: Support for AMBA components
  coresight: acpi: Support for platform devices

 drivers/acpi/acpi_amba.c                           |   9 +
 drivers/hwtracing/coresight/Makefile               |   3 +-
 drivers/hwtracing/coresight/coresight-catu.c       |  40 +-
 drivers/hwtracing/coresight/coresight-catu.h       |   1 -
 drivers/hwtracing/coresight/coresight-cpu-debug.c  |   3 +-
 drivers/hwtracing/coresight/coresight-etb10.c      |  51 +-
 drivers/hwtracing/coresight/coresight-etm-perf.c   |   8 +-
 drivers/hwtracing/coresight/coresight-etm.h        |   6 +-
 .../hwtracing/coresight/coresight-etm3x-sysfs.c    |  12 +-
 drivers/hwtracing/coresight/coresight-etm3x.c      |  45 +-
 drivers/hwtracing/coresight/coresight-etm4x.c      |  37 +-
 drivers/hwtracing/coresight/coresight-etm4x.h      |   2 -
 drivers/hwtracing/coresight/coresight-funnel.c     |  35 +-
 drivers/hwtracing/coresight/coresight-platform.c   | 810 +++++++++++++++++++++
 drivers/hwtracing/coresight/coresight-priv.h       |   4 +
 drivers/hwtracing/coresight/coresight-replicator.c |  42 +-
 drivers/hwtracing/coresight/coresight-stm.c        | 118 ++-
 drivers/hwtracing/coresight/coresight-tmc-etf.c    |   9 +-
 drivers/hwtracing/coresight/coresight-tmc-etr.c    |  44 +-
 drivers/hwtracing/coresight/coresight-tmc.c        |  96 +--
 drivers/hwtracing/coresight/coresight-tmc.h        |   2 -
 drivers/hwtracing/coresight/coresight-tpiu.c       |  24 +-
 drivers/hwtracing/coresight/coresight.c            | 164 ++++-
 drivers/hwtracing/coresight/of_coresight.c         | 297 --------
 include/linux/coresight.h                          |  61 +-
 25 files changed, 1332 insertions(+), 591 deletions(-)
 create mode 100644 drivers/hwtracing/coresight/coresight-platform.c
 delete mode 100644 drivers/hwtracing/coresight/of_coresight.c

ACPI bindings for Juno-r0 (applies on [2] above)

Suzuki K Poulose (1):
  edk2-platform: juno: Update ACPI CoreSight Bindings

 Platform/ARM/JunoPkg/AcpiTables/Dsdt.asl | 241 +++++++++++++++++++++++++++++++
 1 file changed, 241 insertions(+)

-- 
2.7.4


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[PATCH v4 01/30] coresight: funnel: Clean up device book keeping

[Suzuki K Poulose]

In preparation to use a consistent device naming scheme,
clean up the device link tracking in funnel driver.
Use the "coresight" device instead of the "real" parent device
for all internal purposes. All other requests (e.g, power management,
DMA operations) must use the "real" device which is the parent device.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-funnel.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index 16b0c0e..6236a84 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -32,14 +32,12 @@
 /**
  * struct funnel_drvdata - specifics associated to a funnel component
  * @base:	memory mapped base address for this component.
- * @dev:	the device entity associated to this component.
  * @atclk:	optional clock for the core parts of the funnel.
  * @csdev:	component vitals needed by the framework.
  * @priority:	port selection order.
  */
 struct funnel_drvdata {
 	void __iomem		*base;
-	struct device		*dev;
 	struct clk		*atclk;
 	struct coresight_device	*csdev;
 	unsigned long		priority;
@@ -80,7 +78,7 @@ static int funnel_enable(struct coresight_device *csdev, int inport,
 		rc = dynamic_funnel_enable_hw(drvdata, inport);
 
 	if (!rc)
-		dev_dbg(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
+		dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n", inport);
 	return rc;
 }
 
@@ -110,7 +108,7 @@ static void funnel_disable(struct coresight_device *csdev, int inport,
 	if (drvdata->base)
 		dynamic_funnel_disable_hw(drvdata, inport);
 
-	dev_dbg(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
+	dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n", inport);
 }
 
 static const struct coresight_ops_link funnel_link_ops = {
@@ -165,11 +163,11 @@ static ssize_t funnel_ctrl_show(struct device *dev,
 	u32 val;
 	struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 
-	pm_runtime_get_sync(drvdata->dev);
+	pm_runtime_get_sync(dev->parent);
 
 	val = get_funnel_ctrl_hw(drvdata);
 
-	pm_runtime_put(drvdata->dev);
+	pm_runtime_put(dev->parent);
 
 	return sprintf(buf, "%#x\n", val);
 }
@@ -205,7 +203,6 @@ static int funnel_probe(struct device *dev, struct resource *res)
 	if (!drvdata)
 		return -ENOMEM;
 
-	drvdata->dev = dev;
 	drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
 	if (!IS_ERR(drvdata->atclk)) {
 		ret = clk_prepare_enable(drvdata->atclk);
-- 
2.7.4


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[PATCH v4 02/30] coresight: replicator: Cleanup device tracking

[Suzuki K Poulose]

In preparation to use a consistent device naming scheme,
clean up the device link tracking in replicator driver.
Use the "coresight" device instead of the "real" parent device
for all internal purposes. All other requests (e.g, power management,
DMA operations) must use the "real" device which is the parent device.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-replicator.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index 8c9ce74..ee6ad34 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -26,13 +26,11 @@
  * struct replicator_drvdata - specifics associated to a replicator component
  * @base:	memory mapped base address for this component. Also indicates
  *		whether this one is programmable or not.
- * @dev:	the device entity associated with this component
  * @atclk:	optional clock for the core parts of the replicator.
  * @csdev:	component vitals needed by the framework
  */
 struct replicator_drvdata {
 	void __iomem		*base;
-	struct device		*dev;
 	struct clk		*atclk;
 	struct coresight_device	*csdev;
 };
@@ -100,7 +98,7 @@ static int replicator_enable(struct coresight_device *csdev, int inport,
 	if (drvdata->base)
 		rc = dynamic_replicator_enable(drvdata, inport, outport);
 	if (!rc)
-		dev_dbg(drvdata->dev, "REPLICATOR enabled\n");
+		dev_dbg(&csdev->dev, "REPLICATOR enabled\n");
 	return rc;
 }
 
@@ -139,7 +137,7 @@ static void replicator_disable(struct coresight_device *csdev, int inport,
 
 	if (drvdata->base)
 		dynamic_replicator_disable(drvdata, inport, outport);
-	dev_dbg(drvdata->dev, "REPLICATOR disabled\n");
+	dev_dbg(&csdev->dev, "REPLICATOR disabled\n");
 }
 
 static const struct coresight_ops_link replicator_link_ops = {
@@ -196,7 +194,6 @@ static int replicator_probe(struct device *dev, struct resource *res)
 	if (!drvdata)
 		return -ENOMEM;
 
-	drvdata->dev = dev;
 	drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
 	if (!IS_ERR(drvdata->atclk)) {
 		ret = clk_prepare_enable(drvdata->atclk);
-- 
2.7.4


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[PATCH v4 03/30] coresight: tmc: Clean up device specific data

[Suzuki K Poulose]

In preparation to use a consistent device naming scheme,
clean up the device link tracking in replicator driver.
Use the "coresight" device instead of the "real" parent device
for all internal purposes. All other requests (e.g, power management,
DMA operations) must use the "real" device which is the parent device.

Since the CATU driver also uses the TMC-SG infrastructure, update
the callers to ensure they pass the appropriate device argument
for the tables.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-catu.c    |  5 ++--
 drivers/hwtracing/coresight/coresight-tmc-etf.c |  9 +++---
 drivers/hwtracing/coresight/coresight-tmc-etr.c | 40 ++++++++++++++-----------
 drivers/hwtracing/coresight/coresight-tmc.c     | 38 +++++++++++------------
 drivers/hwtracing/coresight/coresight-tmc.h     |  2 --
 5 files changed, 47 insertions(+), 47 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 4ea68a3..d948a72 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -328,19 +328,18 @@ static int catu_alloc_etr_buf(struct tmc_drvdata *tmc_drvdata,
 			      struct etr_buf *etr_buf, int node, void **pages)
 {
 	struct coresight_device *csdev;
-	struct device *catu_dev;
 	struct tmc_sg_table *catu_table;
 	struct catu_etr_buf *catu_buf;
 
 	csdev = tmc_etr_get_catu_device(tmc_drvdata);
 	if (!csdev)
 		return -ENODEV;
-	catu_dev = csdev->dev.parent;
 	catu_buf = kzalloc(sizeof(*catu_buf), GFP_KERNEL);
 	if (!catu_buf)
 		return -ENOMEM;
 
-	catu_table = catu_init_sg_table(catu_dev, node, etr_buf->size, pages);
+	catu_table = catu_init_sg_table(&csdev->dev, node,
+					etr_buf->size, pages);
 	if (IS_ERR(catu_table)) {
 		kfree(catu_buf);
 		return PTR_ERR(catu_table);
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 2527b5d..31093de 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -280,7 +280,6 @@ static int tmc_enable_etf_sink(struct coresight_device *csdev,
 			       u32 mode, void *data)
 {
 	int ret;
-	struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 
 	switch (mode) {
 	case CS_MODE_SYSFS:
@@ -298,7 +297,7 @@ static int tmc_enable_etf_sink(struct coresight_device *csdev,
 	if (ret)
 		return ret;
 
-	dev_dbg(drvdata->dev, "TMC-ETB/ETF enabled\n");
+	dev_dbg(&csdev->dev, "TMC-ETB/ETF enabled\n");
 	return 0;
 }
 
@@ -328,7 +327,7 @@ static int tmc_disable_etf_sink(struct coresight_device *csdev)
 
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
-	dev_dbg(drvdata->dev, "TMC-ETB/ETF disabled\n");
+	dev_dbg(&csdev->dev, "TMC-ETB/ETF disabled\n");
 	return 0;
 }
 
@@ -351,7 +350,7 @@ static int tmc_enable_etf_link(struct coresight_device *csdev,
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
 	if (!ret)
-		dev_dbg(drvdata->dev, "TMC-ETF enabled\n");
+		dev_dbg(&csdev->dev, "TMC-ETF enabled\n");
 	return ret;
 }
 
@@ -371,7 +370,7 @@ static void tmc_disable_etf_link(struct coresight_device *csdev,
 	drvdata->mode = CS_MODE_DISABLED;
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
-	dev_dbg(drvdata->dev, "TMC-ETF disabled\n");
+	dev_dbg(&csdev->dev, "TMC-ETF disabled\n");
 }
 
 static void *tmc_alloc_etf_buffer(struct coresight_device *csdev,
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index df6e4b0..01718cb 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -162,10 +162,11 @@ static void tmc_pages_free(struct tmc_pages *tmc_pages,
 			   struct device *dev, enum dma_data_direction dir)
 {
 	int i;
+	struct device *real_dev = dev->parent;
 
 	for (i = 0; i < tmc_pages->nr_pages; i++) {
 		if (tmc_pages->daddrs && tmc_pages->daddrs[i])
-			dma_unmap_page(dev, tmc_pages->daddrs[i],
+			dma_unmap_page(real_dev, tmc_pages->daddrs[i],
 					 PAGE_SIZE, dir);
 		if (tmc_pages->pages && tmc_pages->pages[i])
 			__free_page(tmc_pages->pages[i]);
@@ -193,6 +194,7 @@ static int tmc_pages_alloc(struct tmc_pages *tmc_pages,
 	int i, nr_pages;
 	dma_addr_t paddr;
 	struct page *page;
+	struct device *real_dev = dev->parent;
 
 	nr_pages = tmc_pages->nr_pages;
 	tmc_pages->daddrs = kcalloc(nr_pages, sizeof(*tmc_pages->daddrs),
@@ -216,8 +218,8 @@ static int tmc_pages_alloc(struct tmc_pages *tmc_pages,
 			page = alloc_pages_node(node,
 						GFP_KERNEL | __GFP_ZERO, 0);
 		}
-		paddr = dma_map_page(dev, page, 0, PAGE_SIZE, dir);
-		if (dma_mapping_error(dev, paddr))
+		paddr = dma_map_page(real_dev, page, 0, PAGE_SIZE, dir);
+		if (dma_mapping_error(real_dev, paddr))
 			goto err;
 		tmc_pages->daddrs[i] = paddr;
 		tmc_pages->pages[i] = page;
@@ -304,7 +306,7 @@ static int tmc_alloc_data_pages(struct tmc_sg_table *sg_table, void **pages)
  * and data buffers. TMC writes to the data buffers and reads from the SG
  * Table pages.
  *
- * @dev		- Device to which page should be DMA mapped.
+ * @dev		- Coresight device to which page should be DMA mapped.
  * @node	- Numa node for mem allocations
  * @nr_tpages	- Number of pages for the table entries.
  * @nr_dpages	- Number of pages for Data buffer.
@@ -348,13 +350,13 @@ void tmc_sg_table_sync_data_range(struct tmc_sg_table *table,
 {
 	int i, index, start;
 	int npages = DIV_ROUND_UP(size, PAGE_SIZE);
-	struct device *dev = table->dev;
+	struct device *real_dev = table->dev->parent;
 	struct tmc_pages *data = &table->data_pages;
 
 	start = offset >> PAGE_SHIFT;
 	for (i = start; i < (start + npages); i++) {
 		index = i % data->nr_pages;
-		dma_sync_single_for_cpu(dev, data->daddrs[index],
+		dma_sync_single_for_cpu(real_dev, data->daddrs[index],
 					PAGE_SIZE, DMA_FROM_DEVICE);
 	}
 }
@@ -363,11 +365,11 @@ void tmc_sg_table_sync_data_range(struct tmc_sg_table *table,
 void tmc_sg_table_sync_table(struct tmc_sg_table *sg_table)
 {
 	int i;
-	struct device *dev = sg_table->dev;
+	struct device *real_dev = sg_table->dev->parent;
 	struct tmc_pages *table_pages = &sg_table->table_pages;
 
 	for (i = 0; i < table_pages->nr_pages; i++)
-		dma_sync_single_for_device(dev, table_pages->daddrs[i],
+		dma_sync_single_for_device(real_dev, table_pages->daddrs[i],
 					   PAGE_SIZE, DMA_TO_DEVICE);
 }
 
@@ -590,6 +592,7 @@ static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata,
 				  void **pages)
 {
 	struct etr_flat_buf *flat_buf;
+	struct device *real_dev = drvdata->csdev->dev.parent;
 
 	/* We cannot reuse existing pages for flat buf */
 	if (pages)
@@ -599,7 +602,7 @@ static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata,
 	if (!flat_buf)
 		return -ENOMEM;
 
-	flat_buf->vaddr = dma_alloc_coherent(drvdata->dev, etr_buf->size,
+	flat_buf->vaddr = dma_alloc_coherent(real_dev, etr_buf->size,
 					     &flat_buf->daddr, GFP_KERNEL);
 	if (!flat_buf->vaddr) {
 		kfree(flat_buf);
@@ -607,7 +610,7 @@ static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata,
 	}
 
 	flat_buf->size = etr_buf->size;
-	flat_buf->dev = drvdata->dev;
+	flat_buf->dev = &drvdata->csdev->dev;
 	etr_buf->hwaddr = flat_buf->daddr;
 	etr_buf->mode = ETR_MODE_FLAT;
 	etr_buf->private = flat_buf;
@@ -617,9 +620,10 @@ static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata,
 static void tmc_etr_free_flat_buf(struct etr_buf *etr_buf)
 {
 	struct etr_flat_buf *flat_buf = etr_buf->private;
+	struct device *real_dev = flat_buf->dev->parent;
 
 	if (flat_buf && flat_buf->daddr)
-		dma_free_coherent(flat_buf->dev, flat_buf->size,
+		dma_free_coherent(real_dev, flat_buf->size,
 				  flat_buf->vaddr, flat_buf->daddr);
 	kfree(flat_buf);
 }
@@ -666,8 +670,9 @@ static int tmc_etr_alloc_sg_buf(struct tmc_drvdata *drvdata,
 				void **pages)
 {
 	struct etr_sg_table *etr_table;
+	struct device *dev = &drvdata->csdev->dev;
 
-	etr_table = tmc_init_etr_sg_table(drvdata->dev, node,
+	etr_table = tmc_init_etr_sg_table(dev, node,
 					  etr_buf->size, pages);
 	if (IS_ERR(etr_table))
 		return -ENOMEM;
@@ -823,9 +828,10 @@ static struct etr_buf *tmc_alloc_etr_buf(struct tmc_drvdata *drvdata,
 	bool has_etr_sg, has_iommu;
 	bool has_sg, has_catu;
 	struct etr_buf *etr_buf;
+	struct device *dev = &drvdata->csdev->dev;
 
 	has_etr_sg = tmc_etr_has_cap(drvdata, TMC_ETR_SG);
-	has_iommu = iommu_get_domain_for_dev(drvdata->dev);
+	has_iommu = iommu_get_domain_for_dev(dev->parent);
 	has_catu = !!tmc_etr_get_catu_device(drvdata);
 
 	has_sg = has_catu || has_etr_sg;
@@ -863,7 +869,7 @@ static struct etr_buf *tmc_alloc_etr_buf(struct tmc_drvdata *drvdata,
 		return ERR_PTR(rc);
 	}
 
-	dev_dbg(drvdata->dev, "allocated buffer of size %ldKB in mode %d\n",
+	dev_dbg(dev, "allocated buffer of size %ldKB in mode %d\n",
 		(unsigned long)size >> 10, etr_buf->mode);
 	return etr_buf;
 }
@@ -1162,7 +1168,7 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
 		tmc_etr_free_sysfs_buf(free_buf);
 
 	if (!ret)
-		dev_dbg(drvdata->dev, "TMC-ETR enabled\n");
+		dev_dbg(&csdev->dev, "TMC-ETR enabled\n");
 
 	return ret;
 }
@@ -1358,7 +1364,7 @@ static void *tmc_alloc_etr_buffer(struct coresight_device *csdev,
 	etr_perf = tmc_etr_setup_perf_buf(drvdata, event,
 					  nr_pages, pages, snapshot);
 	if (IS_ERR(etr_perf)) {
-		dev_dbg(drvdata->dev, "Unable to allocate ETR buffer\n");
+		dev_dbg(&csdev->dev, "Unable to allocate ETR buffer\n");
 		return NULL;
 	}
 
@@ -1612,7 +1618,7 @@ static int tmc_disable_etr_sink(struct coresight_device *csdev)
 
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
-	dev_dbg(drvdata->dev, "TMC-ETR disabled\n");
+	dev_dbg(&csdev->dev, "TMC-ETR disabled\n");
 	return 0;
 }
 
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 3f71872..3b39f43 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -32,7 +32,7 @@ void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
 	/* Ensure formatter, unformatter and hardware fifo are empty */
 	if (coresight_timeout(drvdata->base,
 			      TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
-		dev_err(drvdata->dev,
+		dev_err(&drvdata->csdev->dev,
 			"timeout while waiting for TMC to be Ready\n");
 	}
 }
@@ -49,7 +49,7 @@ void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
 	/* Ensure flush completes */
 	if (coresight_timeout(drvdata->base,
 			      TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
-		dev_err(drvdata->dev,
+		dev_err(&drvdata->csdev->dev,
 		"timeout while waiting for completion of Manual Flush\n");
 	}
 
@@ -83,7 +83,7 @@ static int tmc_read_prepare(struct tmc_drvdata *drvdata)
 	}
 
 	if (!ret)
-		dev_dbg(drvdata->dev, "TMC read start\n");
+		dev_dbg(&drvdata->csdev->dev, "TMC read start\n");
 
 	return ret;
 }
@@ -105,7 +105,7 @@ static int tmc_read_unprepare(struct tmc_drvdata *drvdata)
 	}
 
 	if (!ret)
-		dev_dbg(drvdata->dev, "TMC read end\n");
+		dev_dbg(&drvdata->csdev->dev, "TMC read end\n");
 
 	return ret;
 }
@@ -122,7 +122,7 @@ static int tmc_open(struct inode *inode, struct file *file)
 
 	nonseekable_open(inode, file);
 
-	dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
+	dev_dbg(&drvdata->csdev->dev, "%s: successfully opened\n", __func__);
 	return 0;
 }
 
@@ -152,12 +152,13 @@ static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
 		return 0;
 
 	if (copy_to_user(data, bufp, actual)) {
-		dev_dbg(drvdata->dev, "%s: copy_to_user failed\n", __func__);
+		dev_dbg(&drvdata->csdev->dev,
+			"%s: copy_to_user failed\n", __func__);
 		return -EFAULT;
 	}
 
 	*ppos += actual;
-	dev_dbg(drvdata->dev, "%zu bytes copied\n", actual);
+	dev_dbg(&drvdata->csdev->dev, "%zu bytes copied\n", actual);
 
 	return actual;
 }
@@ -172,7 +173,7 @@ static int tmc_release(struct inode *inode, struct file *file)
 	if (ret)
 		return ret;
 
-	dev_dbg(drvdata->dev, "%s: released\n", __func__);
+	dev_dbg(&drvdata->csdev->dev, "%s: released\n", __func__);
 	return 0;
 }
 
@@ -332,24 +333,22 @@ const struct attribute_group *coresight_tmc_groups[] = {
 	NULL,
 };
 
-static inline bool tmc_etr_can_use_sg(struct tmc_drvdata *drvdata)
+static inline bool tmc_etr_can_use_sg(struct device *dev)
 {
-	return fwnode_property_present(drvdata->dev->fwnode,
-				       "arm,scatter-gather");
+	return fwnode_property_present(dev->fwnode, "arm,scatter-gather");
 }
 
 /* Detect and initialise the capabilities of a TMC ETR */
-static int tmc_etr_setup_caps(struct tmc_drvdata *drvdata,
-			     u32 devid, void *dev_caps)
+static int tmc_etr_setup_caps(struct device *parent, u32 devid, void *dev_caps)
 {
 	int rc;
-
 	u32 dma_mask = 0;
+	struct tmc_drvdata *drvdata = dev_get_drvdata(parent);
 
 	/* Set the unadvertised capabilities */
 	tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps);
 
-	if (!(devid & TMC_DEVID_NOSCAT) && tmc_etr_can_use_sg(drvdata))
+	if (!(devid & TMC_DEVID_NOSCAT) && tmc_etr_can_use_sg(parent))
 		tmc_etr_set_cap(drvdata, TMC_ETR_SG);
 
 	/* Check if the AXI address width is available */
@@ -367,15 +366,15 @@ static int tmc_etr_setup_caps(struct tmc_drvdata *drvdata,
 	case 44:
 	case 48:
 	case 52:
-		dev_info(drvdata->dev, "Detected dma mask %dbits\n", dma_mask);
+		dev_info(parent, "Detected dma mask %dbits\n", dma_mask);
 		break;
 	default:
 		dma_mask = 40;
 	}
 
-	rc = dma_set_mask_and_coherent(drvdata->dev, DMA_BIT_MASK(dma_mask));
+	rc = dma_set_mask_and_coherent(parent, DMA_BIT_MASK(dma_mask));
 	if (rc)
-		dev_err(drvdata->dev, "Failed to setup DMA mask: %d\n", rc);
+		dev_err(parent, "Failed to setup DMA mask: %d\n", rc);
 	return rc;
 }
 
@@ -405,7 +404,6 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 	if (!drvdata)
 		goto out;
 
-	drvdata->dev = &adev->dev;
 	dev_set_drvdata(dev, drvdata);
 
 	/* Validity for the resource is already checked by the AMBA core */
@@ -450,7 +448,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 		desc.type = CORESIGHT_DEV_TYPE_SINK;
 		desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 		desc.ops = &tmc_etr_cs_ops;
-		ret = tmc_etr_setup_caps(drvdata, devid,
+		ret = tmc_etr_setup_caps(dev, devid,
 					 coresight_get_uci_data(id));
 		if (ret)
 			goto out;
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 503f1b3..1ed5041 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -161,7 +161,6 @@ struct etr_buf {
 /**
  * struct tmc_drvdata - specifics associated to an TMC component
  * @base:	memory mapped base address for this component.
- * @dev:	the device entity associated to this component.
  * @csdev:	component vitals needed by the framework.
  * @miscdev:	specifics to handle "/dev/xyz.tmc" entry.
  * @spinlock:	only one at a time pls.
@@ -184,7 +183,6 @@ struct etr_buf {
  */
 struct tmc_drvdata {
 	void __iomem		*base;
-	struct device		*dev;
 	struct coresight_device	*csdev;
 	struct miscdevice	miscdev;
 	spinlock_t		spinlock;
-- 
2.7.4


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[PATCH v4 04/30] coresight: catu: Cleanup device specific data

[Suzuki K Poulose]

Switch to using the CoreSight device instead of the real
amba device.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-catu.c | 13 +++++++------
 drivers/hwtracing/coresight/coresight-catu.h |  1 -
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index d948a72..63109c9 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -408,13 +408,14 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, void *data)
 	int rc;
 	u32 control, mode;
 	struct etr_buf *etr_buf = data;
+	struct device *dev = &drvdata->csdev->dev;
 
 	if (catu_wait_for_ready(drvdata))
-		dev_warn(drvdata->dev, "Timeout while waiting for READY\n");
+		dev_warn(dev, "Timeout while waiting for READY\n");
 
 	control = catu_read_control(drvdata);
 	if (control & BIT(CATU_CONTROL_ENABLE)) {
-		dev_warn(drvdata->dev, "CATU is already enabled\n");
+		dev_warn(dev, "CATU is already enabled\n");
 		return -EBUSY;
 	}
 
@@ -440,7 +441,7 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, void *data)
 	catu_write_irqen(drvdata, 0);
 	catu_write_mode(drvdata, mode);
 	catu_write_control(drvdata, control);
-	dev_dbg(drvdata->dev, "Enabled in %s mode\n",
+	dev_dbg(dev, "Enabled in %s mode\n",
 		(mode == CATU_MODE_PASS_THROUGH) ?
 		"Pass through" :
 		"Translate");
@@ -461,15 +462,16 @@ static int catu_enable(struct coresight_device *csdev, void *data)
 static int catu_disable_hw(struct catu_drvdata *drvdata)
 {
 	int rc = 0;
+	struct device *dev = &drvdata->csdev->dev;
 
 	catu_write_control(drvdata, 0);
 	coresight_disclaim_device_unlocked(drvdata->base);
 	if (catu_wait_for_ready(drvdata)) {
-		dev_info(drvdata->dev, "Timeout while waiting for READY\n");
+		dev_info(dev, "Timeout while waiting for READY\n");
 		rc = -EAGAIN;
 	}
 
-	dev_dbg(drvdata->dev, "Disabled\n");
+	dev_dbg(dev, "Disabled\n");
 	return rc;
 }
 
@@ -519,7 +521,6 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
 		goto out;
 	}
 
-	drvdata->dev = dev;
 	dev_set_drvdata(dev, drvdata);
 	base = devm_ioremap_resource(dev, &adev->res);
 	if (IS_ERR(base)) {
diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h
index 1d2ad18..80ceee3 100644
--- a/drivers/hwtracing/coresight/coresight-catu.h
+++ b/drivers/hwtracing/coresight/coresight-catu.h
@@ -61,7 +61,6 @@
 #define CATU_IRQEN_OFF		0x0
 
 struct catu_drvdata {
-	struct device *dev;
 	void __iomem *base;
 	struct coresight_device *csdev;
 	int irq;
-- 
2.7.4


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[PATCH v4 05/30] coresight: tpiu: Clean up device specific data

[Suzuki K Poulose]

Switch to using the coresight device instead of the parent
amba device.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-tpiu.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index 63d9af3..4dd3e7f 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -49,13 +49,11 @@
 
 /**
  * @base:	memory mapped base address for this component.
- * @dev:	the device entity associated to this component.
  * @atclk:	optional clock for the core parts of the TPIU.
  * @csdev:	component vitals needed by the framework.
  */
 struct tpiu_drvdata {
 	void __iomem		*base;
-	struct device		*dev;
 	struct clk		*atclk;
 	struct coresight_device	*csdev;
 };
@@ -75,7 +73,7 @@ static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused)
 
 	tpiu_enable_hw(drvdata);
 	atomic_inc(csdev->refcnt);
-	dev_dbg(drvdata->dev, "TPIU enabled\n");
+	dev_dbg(&csdev->dev, "TPIU enabled\n");
 	return 0;
 }
 
@@ -104,7 +102,7 @@ static int tpiu_disable(struct coresight_device *csdev)
 
 	tpiu_disable_hw(drvdata);
 
-	dev_dbg(drvdata->dev, "TPIU disabled\n");
+	dev_dbg(&csdev->dev, "TPIU disabled\n");
 	return 0;
 }
 
@@ -139,7 +137,6 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	if (!drvdata)
 		return -ENOMEM;
 
-	drvdata->dev = &adev->dev;
 	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 	if (!IS_ERR(drvdata->atclk)) {
 		ret = clk_prepare_enable(drvdata->atclk);
-- 
2.7.4


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[PATCH v4 06/30] coresight: stm: Cleanup device specific data

[Suzuki K Poulose]

Keep track of the STM coresight device which is a child device
of the AMBA device. Since we can get to the coresight_device
from the "device" instance, remove the explicit field.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-stm.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 9f8a844..8f50484 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -110,7 +110,6 @@ struct channel_space {
 /**
  * struct stm_drvdata - specifics associated to an STM component
  * @base:		memory mapped base address for this component.
- * @dev:		the device entity associated to this component.
  * @atclk:		optional clock for the core parts of the STM.
  * @csdev:		component vitals needed by the framework.
  * @spinlock:		only one at a time pls.
@@ -128,7 +127,6 @@ struct channel_space {
  */
 struct stm_drvdata {
 	void __iomem		*base;
-	struct device		*dev;
 	struct clk		*atclk;
 	struct coresight_device	*csdev;
 	spinlock_t		spinlock;
@@ -205,13 +203,13 @@ static int stm_enable(struct coresight_device *csdev,
 	if (val)
 		return -EBUSY;
 
-	pm_runtime_get_sync(drvdata->dev);
+	pm_runtime_get_sync(csdev->dev.parent);
 
 	spin_lock(&drvdata->spinlock);
 	stm_enable_hw(drvdata);
 	spin_unlock(&drvdata->spinlock);
 
-	dev_dbg(drvdata->dev, "STM tracing enabled\n");
+	dev_dbg(&csdev->dev, "STM tracing enabled\n");
 	return 0;
 }
 
@@ -271,10 +269,10 @@ static void stm_disable(struct coresight_device *csdev,
 		/* Wait until the engine has completely stopped */
 		coresight_timeout(drvdata->base, STMTCSR, STMTCSR_BUSY_BIT, 0);
 
-		pm_runtime_put(drvdata->dev);
+		pm_runtime_put(csdev->dev.parent);
 
 		local_set(&drvdata->mode, CS_MODE_DISABLED);
-		dev_dbg(drvdata->dev, "STM tracing disabled\n");
+		dev_dbg(&csdev->dev, "STM tracing disabled\n");
 	}
 }
 
@@ -763,9 +761,10 @@ static void stm_init_default_data(struct stm_drvdata *drvdata)
 	bitmap_clear(drvdata->chs.guaranteed, 0, drvdata->numsp);
 }
 
-static void stm_init_generic_data(struct stm_drvdata *drvdata)
+static void stm_init_generic_data(struct stm_drvdata *drvdata,
+				  const char *name)
 {
-	drvdata->stm.name = dev_name(drvdata->dev);
+	drvdata->stm.name = name;
 
 	/*
 	 * MasterIDs are assigned at HW design phase. As such the core is
@@ -807,7 +806,6 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	if (!drvdata)
 		return -ENOMEM;
 
-	drvdata->dev = &adev->dev;
 	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 	if (!IS_ERR(drvdata->atclk)) {
 		ret = clk_prepare_enable(drvdata->atclk);
@@ -848,7 +846,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	spin_lock_init(&drvdata->spinlock);
 
 	stm_init_default_data(drvdata);
-	stm_init_generic_data(drvdata);
+	stm_init_generic_data(drvdata, dev_name(dev));
 
 	if (stm_register_device(dev, &drvdata->stm, THIS_MODULE)) {
 		dev_info(dev,
@@ -870,7 +868,8 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 
 	pm_runtime_put(&adev->dev);
 
-	dev_info(dev, "%s initialized\n", (char *)coresight_get_uci_data(id));
+	dev_info(&drvdata->csdev->dev, "%s initialized\n",
+		 (char *)coresight_get_uci_data(id));
 	return 0;
 
 stm_unregister:
-- 
2.7.4


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[PATCH v4 07/30] coresight: etm: Clean up device specific data

[Suzuki K Poulose]

Track the coresight device instead of the real device.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm.h        |  6 ++----
 .../hwtracing/coresight/coresight-etm3x-sysfs.c    | 12 ++++++------
 drivers/hwtracing/coresight/coresight-etm3x.c      | 22 ++++++++++++----------
 drivers/hwtracing/coresight/coresight-etm4x.c      | 17 +++++++++--------
 drivers/hwtracing/coresight/coresight-etm4x.h      |  2 --
 5 files changed, 29 insertions(+), 30 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm.h b/drivers/hwtracing/coresight/coresight-etm.h
index 79e1ad8..f3ab96e 100644
--- a/drivers/hwtracing/coresight/coresight-etm.h
+++ b/drivers/hwtracing/coresight/coresight-etm.h
@@ -208,7 +208,6 @@ struct etm_config {
 /**
  * struct etm_drvdata - specifics associated to an ETM component
  * @base:	memory mapped base address for this component.
- * @dev:	the device entity associated to this component.
  * @atclk:	optional clock for the core parts of the ETM.
  * @csdev:	component vitals needed by the framework.
  * @spinlock:	only one at a time pls.
@@ -232,7 +231,6 @@ struct etm_config {
  */
 struct etm_drvdata {
 	void __iomem			*base;
-	struct device			*dev;
 	struct clk			*atclk;
 	struct coresight_device		*csdev;
 	spinlock_t			spinlock;
@@ -260,7 +258,7 @@ static inline void etm_writel(struct etm_drvdata *drvdata,
 {
 	if (drvdata->use_cp14) {
 		if (etm_writel_cp14(off, val)) {
-			dev_err(drvdata->dev,
+			dev_err(&drvdata->csdev->dev,
 				"invalid CP14 access to ETM reg: %#x", off);
 		}
 	} else {
@@ -274,7 +272,7 @@ static inline unsigned int etm_readl(struct etm_drvdata *drvdata, u32 off)
 
 	if (drvdata->use_cp14) {
 		if (etm_readl_cp14(off, &val)) {
-			dev_err(drvdata->dev,
+			dev_err(&drvdata->csdev->dev,
 				"invalid CP14 access to ETM reg: %#x", off);
 		}
 	} else {
diff --git a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
index 75487b3..e8c7649 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
@@ -48,7 +48,7 @@ static ssize_t etmsr_show(struct device *dev,
 	unsigned long flags, val;
 	struct etm_drvdata *drvdata = dev_get_drvdata(dev->parent);
 
-	pm_runtime_get_sync(drvdata->dev);
+	pm_runtime_get_sync(dev->parent);
 	spin_lock_irqsave(&drvdata->spinlock, flags);
 	CS_UNLOCK(drvdata->base);
 
@@ -56,7 +56,7 @@ static ssize_t etmsr_show(struct device *dev,
 
 	CS_LOCK(drvdata->base);
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
-	pm_runtime_put(drvdata->dev);
+	pm_runtime_put(dev->parent);
 
 	return sprintf(buf, "%#lx\n", val);
 }
@@ -131,7 +131,7 @@ static ssize_t mode_store(struct device *dev,
 
 	if (config->mode & ETM_MODE_STALL) {
 		if (!(drvdata->etmccr & ETMCCR_FIFOFULL)) {
-			dev_warn(drvdata->dev, "stall mode not supported\n");
+			dev_warn(dev, "stall mode not supported\n");
 			ret = -EINVAL;
 			goto err_unlock;
 		}
@@ -141,7 +141,7 @@ static ssize_t mode_store(struct device *dev,
 
 	if (config->mode & ETM_MODE_TIMESTAMP) {
 		if (!(drvdata->etmccer & ETMCCER_TIMESTAMP)) {
-			dev_warn(drvdata->dev, "timestamp not supported\n");
+			dev_warn(dev, "timestamp not supported\n");
 			ret = -EINVAL;
 			goto err_unlock;
 		}
@@ -945,7 +945,7 @@ static ssize_t seq_curr_state_show(struct device *dev,
 		goto out;
 	}
 
-	pm_runtime_get_sync(drvdata->dev);
+	pm_runtime_get_sync(dev->parent);
 	spin_lock_irqsave(&drvdata->spinlock, flags);
 
 	CS_UNLOCK(drvdata->base);
@@ -953,7 +953,7 @@ static ssize_t seq_curr_state_show(struct device *dev,
 	CS_LOCK(drvdata->base);
 
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
-	pm_runtime_put(drvdata->dev);
+	pm_runtime_put(dev->parent);
 out:
 	return sprintf(buf, "%#lx\n", val);
 }
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index be302ec..9c92491 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -165,7 +165,7 @@ static void etm_set_prog(struct etm_drvdata *drvdata)
 	 */
 	isb();
 	if (coresight_timeout_etm(drvdata, ETMSR, ETMSR_PROG_BIT, 1)) {
-		dev_err(drvdata->dev,
+		dev_err(&drvdata->csdev->dev,
 			"%s: timeout observed when probing at offset %#x\n",
 			__func__, ETMSR);
 	}
@@ -184,7 +184,7 @@ static void etm_clr_prog(struct etm_drvdata *drvdata)
 	 */
 	isb();
 	if (coresight_timeout_etm(drvdata, ETMSR, ETMSR_PROG_BIT, 0)) {
-		dev_err(drvdata->dev,
+		dev_err(&drvdata->csdev->dev,
 			"%s: timeout observed when probing at offset %#x\n",
 			__func__, ETMSR);
 	}
@@ -425,7 +425,7 @@ static int etm_enable_hw(struct etm_drvdata *drvdata)
 done:
 	CS_LOCK(drvdata->base);
 
-	dev_dbg(drvdata->dev, "cpu: %d enable smp call done: %d\n",
+	dev_dbg(&drvdata->csdev->dev, "cpu: %d enable smp call done: %d\n",
 		drvdata->cpu, rc);
 	return rc;
 }
@@ -455,6 +455,7 @@ int etm_get_trace_id(struct etm_drvdata *drvdata)
 {
 	unsigned long flags;
 	int trace_id = -1;
+	struct device *etm_dev = drvdata->csdev->dev.parent;
 
 	if (!drvdata)
 		goto out;
@@ -462,7 +463,7 @@ int etm_get_trace_id(struct etm_drvdata *drvdata)
 	if (!local_read(&drvdata->mode))
 		return drvdata->traceid;
 
-	pm_runtime_get_sync(drvdata->dev);
+	pm_runtime_get_sync(etm_dev);
 
 	spin_lock_irqsave(&drvdata->spinlock, flags);
 
@@ -471,7 +472,7 @@ int etm_get_trace_id(struct etm_drvdata *drvdata)
 	CS_LOCK(drvdata->base);
 
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
-	pm_runtime_put(drvdata->dev);
+	pm_runtime_put(etm_dev);
 
 out:
 	return trace_id;
@@ -526,7 +527,7 @@ static int etm_enable_sysfs(struct coresight_device *csdev)
 	spin_unlock(&drvdata->spinlock);
 
 	if (!ret)
-		dev_dbg(drvdata->dev, "ETM tracing enabled\n");
+		dev_dbg(&csdev->dev, "ETM tracing enabled\n");
 	return ret;
 }
 
@@ -581,7 +582,8 @@ static void etm_disable_hw(void *info)
 
 	CS_LOCK(drvdata->base);
 
-	dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu);
+	dev_dbg(&drvdata->csdev->dev,
+		"cpu: %d disable smp call done\n", drvdata->cpu);
 }
 
 static void etm_disable_perf(struct coresight_device *csdev)
@@ -628,7 +630,7 @@ static void etm_disable_sysfs(struct coresight_device *csdev)
 	spin_unlock(&drvdata->spinlock);
 	cpus_read_unlock();
 
-	dev_dbg(drvdata->dev, "ETM tracing disabled\n");
+	dev_dbg(&csdev->dev, "ETM tracing disabled\n");
 }
 
 static void etm_disable(struct coresight_device *csdev,
@@ -803,7 +805,6 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 		drvdata->use_cp14 = of_property_read_bool(np, "arm,cp14");
 	}
 
-	drvdata->dev = &adev->dev;
 	dev_set_drvdata(dev, drvdata);
 
 	/* Validity for the resource is already checked by the AMBA core */
@@ -871,7 +872,8 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 	}
 
 	pm_runtime_put(&adev->dev);
-	dev_info(dev, "%s initialized\n", (char *)coresight_get_uci_data(id));
+	dev_info(&drvdata->csdev->dev,
+		 "%s initialized\n", (char *)coresight_get_uci_data(id));
 	if (boot_enable) {
 		coresight_enable(drvdata->csdev);
 		drvdata->boot_enable = true;
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 8bb0092..77d1d837 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -88,6 +88,7 @@ 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;
 
 	CS_UNLOCK(drvdata->base);
 
@@ -102,7 +103,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
 
 	/* wait for TRCSTATR.IDLE to go up */
 	if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
-		dev_err(drvdata->dev,
+		dev_err(etm_dev,
 			"timeout while waiting for Idle Trace Status\n");
 
 	writel_relaxed(config->pe_sel, drvdata->base + TRCPROCSELR);
@@ -184,13 +185,13 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
 
 	/* wait for TRCSTATR.IDLE to go back down to '0' */
 	if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
-		dev_err(drvdata->dev,
+		dev_err(etm_dev,
 			"timeout while waiting for Idle Trace Status\n");
 
 done:
 	CS_LOCK(drvdata->base);
 
-	dev_dbg(drvdata->dev, "cpu: %d enable smp call done: %d\n",
+	dev_dbg(etm_dev, "cpu: %d enable smp call done: %d\n",
 		drvdata->cpu, rc);
 	return rc;
 }
@@ -400,7 +401,7 @@ static int etm4_enable_sysfs(struct coresight_device *csdev)
 	spin_unlock(&drvdata->spinlock);
 
 	if (!ret)
-		dev_dbg(drvdata->dev, "ETM tracing enabled\n");
+		dev_dbg(&csdev->dev, "ETM tracing enabled\n");
 	return ret;
 }
 
@@ -461,7 +462,8 @@ static void etm4_disable_hw(void *info)
 
 	CS_LOCK(drvdata->base);
 
-	dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu);
+	dev_dbg(&drvdata->csdev->dev,
+		"cpu: %d disable smp call done\n", drvdata->cpu);
 }
 
 static int etm4_disable_perf(struct coresight_device *csdev,
@@ -511,7 +513,7 @@ static void etm4_disable_sysfs(struct coresight_device *csdev)
 	spin_unlock(&drvdata->spinlock);
 	cpus_read_unlock();
 
-	dev_dbg(drvdata->dev, "ETM tracing disabled\n");
+	dev_dbg(&csdev->dev, "ETM tracing disabled\n");
 }
 
 static void etm4_disable(struct coresight_device *csdev,
@@ -1095,7 +1097,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 		adev->dev.platform_data = pdata;
 	}
 
-	drvdata->dev = &adev->dev;
 	dev_set_drvdata(dev, drvdata);
 
 	/* Validity for the resource is already checked by the AMBA core */
@@ -1157,7 +1158,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	}
 
 	pm_runtime_put(&adev->dev);
-	dev_info(dev, "CPU%d: ETM v%d.%d initialized\n",
+	dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n",
 		 drvdata->cpu, drvdata->arch >> 4, drvdata->arch & 0xf);
 
 	if (boot_enable) {
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index 52786e9..4523f10 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -284,7 +284,6 @@ struct etmv4_config {
 /**
  * struct etm4_drvdata - specifics associated to an ETM component
  * @base:       Memory mapped base address for this component.
- * @dev:        The device entity associated to this component.
  * @csdev:      Component vitals needed by the framework.
  * @spinlock:   Only one at a time pls.
  * @mode:	This tracer's mode, i.e sysFS, Perf or disabled.
@@ -340,7 +339,6 @@ struct etmv4_config {
  */
 struct etmv4_drvdata {
 	void __iomem			*base;
-	struct device			*dev;
 	struct coresight_device		*csdev;
 	spinlock_t			spinlock;
 	local_t				mode;
-- 
2.7.4


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[PATCH v4 08/30] coresight: etb10: Clean up device specific data

[Suzuki K Poulose]

Track the coresight device instead of the real device.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etb10.c | 32 +++++++++++++--------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 4ee4c80..3b333fb 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -66,7 +66,6 @@
 /**
  * struct etb_drvdata - specifics associated to an ETB component
  * @base:	memory mapped base address for this component.
- * @dev:	the device entity associated to this component.
  * @atclk:	optional clock for the core parts of the ETB.
  * @csdev:	component vitals needed by the framework.
  * @miscdev:	specifics to handle "/dev/xyz.etb" entry.
@@ -81,7 +80,6 @@
  */
 struct etb_drvdata {
 	void __iomem		*base;
-	struct device		*dev;
 	struct clk		*atclk;
 	struct coresight_device	*csdev;
 	struct miscdevice	miscdev;
@@ -227,7 +225,6 @@ static int etb_enable_perf(struct coresight_device *csdev, void *data)
 static int etb_enable(struct coresight_device *csdev, u32 mode, void *data)
 {
 	int ret;
-	struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 
 	switch (mode) {
 	case CS_MODE_SYSFS:
@@ -244,13 +241,14 @@ static int etb_enable(struct coresight_device *csdev, u32 mode, void *data)
 	if (ret)
 		return ret;
 
-	dev_dbg(drvdata->dev, "ETB enabled\n");
+	dev_dbg(&csdev->dev, "ETB enabled\n");
 	return 0;
 }
 
 static void __etb_disable_hw(struct etb_drvdata *drvdata)
 {
 	u32 ffcr;
+	struct device *dev = &drvdata->csdev->dev;
 
 	CS_UNLOCK(drvdata->base);
 
@@ -263,7 +261,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
 	writel_relaxed(ffcr, drvdata->base + ETB_FFCR);
 
 	if (coresight_timeout(drvdata->base, ETB_FFCR, ETB_FFCR_BIT, 0)) {
-		dev_err(drvdata->dev,
+		dev_err(dev,
 		"timeout while waiting for completion of Manual Flush\n");
 	}
 
@@ -271,7 +269,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
 	writel_relaxed(0x0, drvdata->base + ETB_CTL_REG);
 
 	if (coresight_timeout(drvdata->base, ETB_FFSR, ETB_FFSR_BIT, 1)) {
-		dev_err(drvdata->dev,
+		dev_err(dev,
 			"timeout while waiting for Formatter to Stop\n");
 	}
 
@@ -286,6 +284,7 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
 	u32 read_data, depth;
 	u32 read_ptr, write_ptr;
 	u32 frame_off, frame_endoff;
+	struct device *dev = &drvdata->csdev->dev;
 
 	CS_UNLOCK(drvdata->base);
 
@@ -295,10 +294,10 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
 	frame_off = write_ptr % ETB_FRAME_SIZE_WORDS;
 	frame_endoff = ETB_FRAME_SIZE_WORDS - frame_off;
 	if (frame_off) {
-		dev_err(drvdata->dev,
+		dev_err(dev,
 			"write_ptr: %lu not aligned to formatter frame size\n",
 			(unsigned long)write_ptr);
-		dev_err(drvdata->dev, "frameoff: %lu, frame_endoff: %lu\n",
+		dev_err(dev, "frameoff: %lu, frame_endoff: %lu\n",
 			(unsigned long)frame_off, (unsigned long)frame_endoff);
 		write_ptr += frame_endoff;
 	}
@@ -365,7 +364,7 @@ static int etb_disable(struct coresight_device *csdev)
 	drvdata->mode = CS_MODE_DISABLED;
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
-	dev_dbg(drvdata->dev, "ETB disabled\n");
+	dev_dbg(&csdev->dev, "ETB disabled\n");
 	return 0;
 }
 
@@ -460,7 +459,7 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
 	 * chance to fix things.
 	 */
 	if (write_ptr % ETB_FRAME_SIZE_WORDS) {
-		dev_err(drvdata->dev,
+		dev_err(&csdev->dev,
 			"write_ptr: %lu not aligned to formatter frame size\n",
 			(unsigned long)write_ptr);
 
@@ -587,7 +586,7 @@ static void etb_dump(struct etb_drvdata *drvdata)
 	}
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
-	dev_dbg(drvdata->dev, "ETB dumped\n");
+	dev_dbg(&drvdata->csdev->dev, "ETB dumped\n");
 }
 
 static int etb_open(struct inode *inode, struct file *file)
@@ -598,7 +597,7 @@ static int etb_open(struct inode *inode, struct file *file)
 	if (local_cmpxchg(&drvdata->reading, 0, 1))
 		return -EBUSY;
 
-	dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
+	dev_dbg(&drvdata->csdev->dev, "%s: successfully opened\n", __func__);
 	return 0;
 }
 
@@ -608,6 +607,7 @@ static ssize_t etb_read(struct file *file, char __user *data,
 	u32 depth;
 	struct etb_drvdata *drvdata = container_of(file->private_data,
 						   struct etb_drvdata, miscdev);
+	struct device *dev = &drvdata->csdev->dev;
 
 	etb_dump(drvdata);
 
@@ -616,13 +616,14 @@ static ssize_t etb_read(struct file *file, char __user *data,
 		len = depth * 4 - *ppos;
 
 	if (copy_to_user(data, drvdata->buf + *ppos, len)) {
-		dev_dbg(drvdata->dev, "%s: copy_to_user failed\n", __func__);
+		dev_dbg(dev,
+			"%s: copy_to_user failed\n", __func__);
 		return -EFAULT;
 	}
 
 	*ppos += len;
 
-	dev_dbg(drvdata->dev, "%s: %zu bytes copied, %d bytes left\n",
+	dev_dbg(dev, "%s: %zu bytes copied, %d bytes left\n",
 		__func__, len, (int)(depth * 4 - *ppos));
 	return len;
 }
@@ -633,7 +634,7 @@ static int etb_release(struct inode *inode, struct file *file)
 						   struct etb_drvdata, miscdev);
 	local_set(&drvdata->reading, 0);
 
-	dev_dbg(drvdata->dev, "%s: released\n", __func__);
+	dev_dbg(&drvdata->csdev->dev, "%s: released\n", __func__);
 	return 0;
 }
 
@@ -737,7 +738,6 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 	if (!drvdata)
 		return -ENOMEM;
 
-	drvdata->dev = &adev->dev;
 	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 	if (!IS_ERR(drvdata->atclk)) {
 		ret = clk_prepare_enable(drvdata->atclk);
-- 
2.7.4


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[PATCH v4 09/30] coresight: Use coresight device names for sinks in PMU attribute

[Suzuki K Poulose]

From: Mathieu Poirier <mathieu.poirier@linaro.org>

Move to using the coresight device name instead of the parent
device name for SINK attribute for PMU.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm-perf.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index 3c62944..5c1ca0d 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -523,7 +523,7 @@ int etm_perf_add_symlink_sink(struct coresight_device *csdev)
 	unsigned long hash;
 	const char *name;
 	struct device *pmu_dev = etm_pmu.dev;
-	struct device *pdev = csdev->dev.parent;
+	struct device *dev = &csdev->dev;
 	struct dev_ext_attribute *ea;
 
 	if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
@@ -536,15 +536,15 @@ int etm_perf_add_symlink_sink(struct coresight_device *csdev)
 	if (!etm_perf_up)
 		return -EPROBE_DEFER;
 
-	ea = devm_kzalloc(pdev, sizeof(*ea), GFP_KERNEL);
+	ea = devm_kzalloc(dev, sizeof(*ea), GFP_KERNEL);
 	if (!ea)
 		return -ENOMEM;
 
-	name = dev_name(pdev);
+	name = dev_name(dev);
 	/* See function coresight_get_sink_by_id() to know where this is used */
 	hash = hashlen_hash(hashlen_string(NULL, name));
 
-	ea->attr.attr.name = devm_kstrdup(pdev, name, GFP_KERNEL);
+	ea->attr.attr.name = devm_kstrdup(dev, name, GFP_KERNEL);
 	if (!ea->attr.attr.name)
 		return -ENOMEM;
 
-- 
2.7.4


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[PATCH v4 10/30] coresight: Rename of_coresight to coresight-platform

[Suzuki K Poulose]

Rename the firmware handling file to a more generic
name, in preparation for adding ACPI support. Right now
we only support DT and we have all the platform handling
code in of_coresight.c. Let us rename the file to
coresight-platform.c in order to keep the platform handling
in a single place for DT and the upcoming ACPI support.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/Makefile             |   3 +-
 drivers/hwtracing/coresight/coresight-platform.c | 298 +++++++++++++++++++++++
 drivers/hwtracing/coresight/of_coresight.c       | 297 ----------------------
 3 files changed, 299 insertions(+), 299 deletions(-)
 create mode 100644 drivers/hwtracing/coresight/coresight-platform.c
 delete mode 100644 drivers/hwtracing/coresight/of_coresight.c

diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
index 3b435aa..3c0ac42 100644
--- a/drivers/hwtracing/coresight/Makefile
+++ b/drivers/hwtracing/coresight/Makefile
@@ -2,8 +2,7 @@
 #
 # Makefile for CoreSight drivers.
 #
-obj-$(CONFIG_CORESIGHT) += coresight.o coresight-etm-perf.o
-obj-$(CONFIG_OF) += of_coresight.o
+obj-$(CONFIG_CORESIGHT) += coresight.o coresight-etm-perf.o coresight-platform.o
 obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o \
 					     coresight-tmc-etf.o \
 					     coresight-tmc-etr.o
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
new file mode 100644
index 0000000..514cc2b
--- /dev/null
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -0,0 +1,298 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2012, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_graph.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/amba/bus.h>
+#include <linux/coresight.h>
+#include <linux/cpumask.h>
+#include <asm/smp_plat.h>
+
+#ifdef CONFIG_OF
+static int of_dev_node_match(struct device *dev, void *data)
+{
+	return dev->of_node == data;
+}
+
+static struct device *
+of_coresight_get_endpoint_device(struct device_node *endpoint)
+{
+	struct device *dev = NULL;
+
+	/*
+	 * If we have a non-configurable replicator, it will be found on the
+	 * platform bus.
+	 */
+	dev = bus_find_device(&platform_bus_type, NULL,
+			      endpoint, of_dev_node_match);
+	if (dev)
+		return dev;
+
+	/*
+	 * We have a configurable component - circle through the AMBA bus
+	 * looking for the device that matches the endpoint node.
+	 */
+	return bus_find_device(&amba_bustype, NULL,
+			       endpoint, of_dev_node_match);
+}
+
+static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
+{
+	return of_property_read_bool(ep, "slave-mode");
+}
+
+static void of_coresight_get_ports_legacy(const struct device_node *node,
+					  int *nr_inport, int *nr_outport)
+{
+	struct device_node *ep = NULL;
+	int in = 0, out = 0;
+
+	do {
+		ep = of_graph_get_next_endpoint(node, ep);
+		if (!ep)
+			break;
+
+		if (of_coresight_legacy_ep_is_input(ep))
+			in++;
+		else
+			out++;
+
+	} while (ep);
+
+	*nr_inport = in;
+	*nr_outport = out;
+}
+
+static struct device_node *of_coresight_get_port_parent(struct device_node *ep)
+{
+	struct device_node *parent = of_graph_get_port_parent(ep);
+
+	/*
+	 * Skip one-level up to the real device node, if we
+	 * are using the new bindings.
+	 */
+	if (of_node_name_eq(parent, "in-ports") ||
+	    of_node_name_eq(parent, "out-ports"))
+		parent = of_get_next_parent(parent);
+
+	return parent;
+}
+
+static inline struct device_node *
+of_coresight_get_input_ports_node(const struct device_node *node)
+{
+	return of_get_child_by_name(node, "in-ports");
+}
+
+static inline struct device_node *
+of_coresight_get_output_ports_node(const struct device_node *node)
+{
+	return of_get_child_by_name(node, "out-ports");
+}
+
+static inline int
+of_coresight_count_ports(struct device_node *port_parent)
+{
+	int i = 0;
+	struct device_node *ep = NULL;
+
+	while ((ep = of_graph_get_next_endpoint(port_parent, ep)))
+		i++;
+	return i;
+}
+
+static void of_coresight_get_ports(const struct device_node *node,
+				   int *nr_inport, int *nr_outport)
+{
+	struct device_node *input_ports = NULL, *output_ports = NULL;
+
+	input_ports = of_coresight_get_input_ports_node(node);
+	output_ports = of_coresight_get_output_ports_node(node);
+
+	if (input_ports || output_ports) {
+		if (input_ports) {
+			*nr_inport = of_coresight_count_ports(input_ports);
+			of_node_put(input_ports);
+		}
+		if (output_ports) {
+			*nr_outport = of_coresight_count_ports(output_ports);
+			of_node_put(output_ports);
+		}
+	} else {
+		/* Fall back to legacy DT bindings parsing */
+		of_coresight_get_ports_legacy(node, nr_inport, nr_outport);
+	}
+}
+
+static int of_coresight_alloc_memory(struct device *dev,
+			struct coresight_platform_data *pdata)
+{
+	if (pdata->nr_outport) {
+		pdata->conns = devm_kzalloc(dev, pdata->nr_outport *
+					    sizeof(*pdata->conns),
+					    GFP_KERNEL);
+		if (!pdata->conns)
+			return -ENOMEM;
+	}
+
+	return 0;
+}
+
+int of_coresight_get_cpu(const struct device_node *node)
+{
+	int cpu;
+	struct device_node *dn;
+
+	dn = of_parse_phandle(node, "cpu", 0);
+	/* Affinity defaults to CPU0 */
+	if (!dn)
+		return 0;
+	cpu = of_cpu_node_to_id(dn);
+	of_node_put(dn);
+
+	/* Affinity to CPU0 if no cpu nodes are found */
+	return (cpu < 0) ? 0 : cpu;
+}
+EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
+
+/*
+ * of_coresight_parse_endpoint : Parse the given output endpoint @ep
+ * and fill the connection information in @conn
+ *
+ * Parses the local port, remote device name and the remote port.
+ *
+ * Returns :
+ *	 1	- If the parsing is successful and a connection record
+ *		  was created for an output connection.
+ *	 0	- If the parsing completed without any fatal errors.
+ *	-Errno	- Fatal error, abort the scanning.
+ */
+static int of_coresight_parse_endpoint(struct device *dev,
+				       struct device_node *ep,
+				       struct coresight_connection *conn)
+{
+	int ret = 0;
+	struct of_endpoint endpoint, rendpoint;
+	struct device_node *rparent = NULL;
+	struct device_node *rep = NULL;
+	struct device *rdev = NULL;
+
+	do {
+		/* Parse the local port details */
+		if (of_graph_parse_endpoint(ep, &endpoint))
+			break;
+		/*
+		 * Get a handle on the remote endpoint and the device it is
+		 * attached to.
+		 */
+		rep = of_graph_get_remote_endpoint(ep);
+		if (!rep)
+			break;
+		rparent = of_coresight_get_port_parent(rep);
+		if (!rparent)
+			break;
+		if (of_graph_parse_endpoint(rep, &rendpoint))
+			break;
+
+		/* If the remote device is not available, defer probing */
+		rdev = of_coresight_get_endpoint_device(rparent);
+		if (!rdev) {
+			ret = -EPROBE_DEFER;
+			break;
+		}
+
+		conn->outport = endpoint.port;
+		conn->child_name = devm_kstrdup(dev,
+						dev_name(rdev),
+						GFP_KERNEL);
+		conn->child_port = rendpoint.port;
+		/* Connection record updated */
+		ret = 1;
+	} while (0);
+
+	of_node_put(rparent);
+	of_node_put(rep);
+	put_device(rdev);
+
+	return ret;
+}
+
+struct coresight_platform_data *
+of_get_coresight_platform_data(struct device *dev,
+			       const struct device_node *node)
+{
+	int ret = 0;
+	struct coresight_platform_data *pdata;
+	struct coresight_connection *conn;
+	struct device_node *ep = NULL;
+	const struct device_node *parent = NULL;
+	bool legacy_binding = false;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	/* Use device name as sysfs handle */
+	pdata->name = dev_name(dev);
+	pdata->cpu = of_coresight_get_cpu(node);
+
+	/* Get the number of input and output port for this component */
+	of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
+
+	/* If there are no output connections, we are done */
+	if (!pdata->nr_outport)
+		return pdata;
+
+	ret = of_coresight_alloc_memory(dev, pdata);
+	if (ret)
+		return ERR_PTR(ret);
+
+	parent = of_coresight_get_output_ports_node(node);
+	/*
+	 * If the DT uses obsoleted bindings, the ports are listed
+	 * under the device and we need to filter out the input
+	 * ports.
+	 */
+	if (!parent) {
+		legacy_binding = true;
+		parent = node;
+		dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
+	}
+
+	conn = pdata->conns;
+
+	/* Iterate through each output port to discover topology */
+	while ((ep = of_graph_get_next_endpoint(parent, ep))) {
+		/*
+		 * Legacy binding mixes input/output ports under the
+		 * same parent. So, skip the input ports if we are dealing
+		 * with legacy binding, as they processed with their
+		 * connected output ports.
+		 */
+		if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
+			continue;
+
+		ret = of_coresight_parse_endpoint(dev, ep, conn);
+		switch (ret) {
+		case 1:
+			conn++;		/* Fall through */
+		case 0:
+			break;
+		default:
+			return ERR_PTR(ret);
+		}
+	}
+
+	return pdata;
+}
+EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
+#endif
diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
deleted file mode 100644
index 7045930..0000000
--- a/drivers/hwtracing/coresight/of_coresight.c
+++ /dev/null
@@ -1,297 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2012, The Linux Foundation. All rights reserved.
- */
-
-#include <linux/types.h>
-#include <linux/err.h>
-#include <linux/slab.h>
-#include <linux/clk.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_graph.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.h>
-#include <linux/amba/bus.h>
-#include <linux/coresight.h>
-#include <linux/cpumask.h>
-#include <asm/smp_plat.h>
-
-
-static int of_dev_node_match(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
-static struct device *
-of_coresight_get_endpoint_device(struct device_node *endpoint)
-{
-	struct device *dev = NULL;
-
-	/*
-	 * If we have a non-configurable replicator, it will be found on the
-	 * platform bus.
-	 */
-	dev = bus_find_device(&platform_bus_type, NULL,
-			      endpoint, of_dev_node_match);
-	if (dev)
-		return dev;
-
-	/*
-	 * We have a configurable component - circle through the AMBA bus
-	 * looking for the device that matches the endpoint node.
-	 */
-	return bus_find_device(&amba_bustype, NULL,
-			       endpoint, of_dev_node_match);
-}
-
-static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
-{
-	return of_property_read_bool(ep, "slave-mode");
-}
-
-static void of_coresight_get_ports_legacy(const struct device_node *node,
-					  int *nr_inport, int *nr_outport)
-{
-	struct device_node *ep = NULL;
-	int in = 0, out = 0;
-
-	do {
-		ep = of_graph_get_next_endpoint(node, ep);
-		if (!ep)
-			break;
-
-		if (of_coresight_legacy_ep_is_input(ep))
-			in++;
-		else
-			out++;
-
-	} while (ep);
-
-	*nr_inport = in;
-	*nr_outport = out;
-}
-
-static struct device_node *of_coresight_get_port_parent(struct device_node *ep)
-{
-	struct device_node *parent = of_graph_get_port_parent(ep);
-
-	/*
-	 * Skip one-level up to the real device node, if we
-	 * are using the new bindings.
-	 */
-	if (of_node_name_eq(parent, "in-ports") ||
-	    of_node_name_eq(parent, "out-ports"))
-		parent = of_get_next_parent(parent);
-
-	return parent;
-}
-
-static inline struct device_node *
-of_coresight_get_input_ports_node(const struct device_node *node)
-{
-	return of_get_child_by_name(node, "in-ports");
-}
-
-static inline struct device_node *
-of_coresight_get_output_ports_node(const struct device_node *node)
-{
-	return of_get_child_by_name(node, "out-ports");
-}
-
-static inline int
-of_coresight_count_ports(struct device_node *port_parent)
-{
-	int i = 0;
-	struct device_node *ep = NULL;
-
-	while ((ep = of_graph_get_next_endpoint(port_parent, ep)))
-		i++;
-	return i;
-}
-
-static void of_coresight_get_ports(const struct device_node *node,
-				   int *nr_inport, int *nr_outport)
-{
-	struct device_node *input_ports = NULL, *output_ports = NULL;
-
-	input_ports = of_coresight_get_input_ports_node(node);
-	output_ports = of_coresight_get_output_ports_node(node);
-
-	if (input_ports || output_ports) {
-		if (input_ports) {
-			*nr_inport = of_coresight_count_ports(input_ports);
-			of_node_put(input_ports);
-		}
-		if (output_ports) {
-			*nr_outport = of_coresight_count_ports(output_ports);
-			of_node_put(output_ports);
-		}
-	} else {
-		/* Fall back to legacy DT bindings parsing */
-		of_coresight_get_ports_legacy(node, nr_inport, nr_outport);
-	}
-}
-
-static int of_coresight_alloc_memory(struct device *dev,
-			struct coresight_platform_data *pdata)
-{
-	if (pdata->nr_outport) {
-		pdata->conns = devm_kzalloc(dev, pdata->nr_outport *
-					    sizeof(*pdata->conns),
-					    GFP_KERNEL);
-		if (!pdata->conns)
-			return -ENOMEM;
-	}
-
-	return 0;
-}
-
-int of_coresight_get_cpu(const struct device_node *node)
-{
-	int cpu;
-	struct device_node *dn;
-
-	dn = of_parse_phandle(node, "cpu", 0);
-	/* Affinity defaults to CPU0 */
-	if (!dn)
-		return 0;
-	cpu = of_cpu_node_to_id(dn);
-	of_node_put(dn);
-
-	/* Affinity to CPU0 if no cpu nodes are found */
-	return (cpu < 0) ? 0 : cpu;
-}
-EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
-
-/*
- * of_coresight_parse_endpoint : Parse the given output endpoint @ep
- * and fill the connection information in @conn
- *
- * Parses the local port, remote device name and the remote port.
- *
- * Returns :
- *	 1	- If the parsing is successful and a connection record
- *		  was created for an output connection.
- *	 0	- If the parsing completed without any fatal errors.
- *	-Errno	- Fatal error, abort the scanning.
- */
-static int of_coresight_parse_endpoint(struct device *dev,
-				       struct device_node *ep,
-				       struct coresight_connection *conn)
-{
-	int ret = 0;
-	struct of_endpoint endpoint, rendpoint;
-	struct device_node *rparent = NULL;
-	struct device_node *rep = NULL;
-	struct device *rdev = NULL;
-
-	do {
-		/* Parse the local port details */
-		if (of_graph_parse_endpoint(ep, &endpoint))
-			break;
-		/*
-		 * Get a handle on the remote endpoint and the device it is
-		 * attached to.
-		 */
-		rep = of_graph_get_remote_endpoint(ep);
-		if (!rep)
-			break;
-		rparent = of_coresight_get_port_parent(rep);
-		if (!rparent)
-			break;
-		if (of_graph_parse_endpoint(rep, &rendpoint))
-			break;
-
-		/* If the remote device is not available, defer probing */
-		rdev = of_coresight_get_endpoint_device(rparent);
-		if (!rdev) {
-			ret = -EPROBE_DEFER;
-			break;
-		}
-
-		conn->outport = endpoint.port;
-		conn->child_name = devm_kstrdup(dev,
-						dev_name(rdev),
-						GFP_KERNEL);
-		conn->child_port = rendpoint.port;
-		/* Connection record updated */
-		ret = 1;
-	} while (0);
-
-	of_node_put(rparent);
-	of_node_put(rep);
-	put_device(rdev);
-
-	return ret;
-}
-
-struct coresight_platform_data *
-of_get_coresight_platform_data(struct device *dev,
-			       const struct device_node *node)
-{
-	int ret = 0;
-	struct coresight_platform_data *pdata;
-	struct coresight_connection *conn;
-	struct device_node *ep = NULL;
-	const struct device_node *parent = NULL;
-	bool legacy_binding = false;
-
-	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
-	if (!pdata)
-		return ERR_PTR(-ENOMEM);
-
-	/* Use device name as sysfs handle */
-	pdata->name = dev_name(dev);
-	pdata->cpu = of_coresight_get_cpu(node);
-
-	/* Get the number of input and output port for this component */
-	of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
-
-	/* If there are no output connections, we are done */
-	if (!pdata->nr_outport)
-		return pdata;
-
-	ret = of_coresight_alloc_memory(dev, pdata);
-	if (ret)
-		return ERR_PTR(ret);
-
-	parent = of_coresight_get_output_ports_node(node);
-	/*
-	 * If the DT uses obsoleted bindings, the ports are listed
-	 * under the device and we need to filter out the input
-	 * ports.
-	 */
-	if (!parent) {
-		legacy_binding = true;
-		parent = node;
-		dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
-	}
-
-	conn = pdata->conns;
-
-	/* Iterate through each output port to discover topology */
-	while ((ep = of_graph_get_next_endpoint(parent, ep))) {
-		/*
-		 * Legacy binding mixes input/output ports under the
-		 * same parent. So, skip the input ports if we are dealing
-		 * with legacy binding, as they processed with their
-		 * connected output ports.
-		 */
-		if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
-			continue;
-
-		ret = of_coresight_parse_endpoint(dev, ep, conn);
-		switch (ret) {
-		case 1:
-			conn++;		/* Fall through */
-		case 0:
-			break;
-		default:
-			return ERR_PTR(ret);
-		}
-	}
-
-	return pdata;
-}
-EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
-- 
2.7.4


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[PATCH v4 11/30] coresight: etm3x: Rearrange cp14 access detection

[Suzuki K Poulose]

As we are about to refactor the platform specific handling,
move the DT property handling to generic helpers.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm3x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index 9c92491..fa2f141 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -802,9 +802,9 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 			return PTR_ERR(pdata);
 
 		adev->dev.platform_data = pdata;
-		drvdata->use_cp14 = of_property_read_bool(np, "arm,cp14");
 	}
 
+	drvdata->use_cp14 = fwnode_property_read_bool(dev->fwnode, "arm,cp14");
 	dev_set_drvdata(dev, drvdata);
 
 	/* Validity for the resource is already checked by the AMBA core */
-- 
2.7.4


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[PATCH v4 12/30] coresight: stm: Rearrange probing the stimulus area

[Suzuki K Poulose]

As we are about to refactor the platform specific handling
re-arrange some of the DT specific property handling.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-stm.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 8f50484..3992a35 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -683,14 +683,15 @@ static const struct attribute_group *coresight_stm_groups[] = {
 	NULL,
 };
 
-static int stm_get_resource_byname(struct device_node *np,
-				   char *ch_base, struct resource *res)
+#ifdef CONFIG_OF
+static int of_stm_get_stimulus_area(struct device *dev, struct resource *res)
 {
 	const char *name = NULL;
 	int index = 0, found = 0;
+	struct device_node *np = dev->of_node;
 
 	while (!of_property_read_string_index(np, "reg-names", index, &name)) {
-		if (strcmp(ch_base, name)) {
+		if (strcmp("stm-stimulus-base", name)) {
 			index++;
 			continue;
 		}
@@ -705,6 +706,20 @@ static int stm_get_resource_byname(struct device_node *np,
 
 	return of_address_to_resource(np, index, res);
 }
+#else
+static inline int of_stm_get_stimulus_area(struct device *dev,
+					   struct resource *res)
+{
+	return -ENOENT;
+}
+#endif
+
+static int stm_get_stimulus_area(struct device *dev, struct resource *res)
+{
+	if (is_of_node(dev_fwnode(dev)))
+		return of_stm_get_stimulus_area(dev, res);
+	return -ENOENT;
+}
 
 static u32 stm_fundamental_data_size(struct stm_drvdata *drvdata)
 {
@@ -819,7 +834,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 		return PTR_ERR(base);
 	drvdata->base = base;
 
-	ret = stm_get_resource_byname(np, "stm-stimulus-base", &ch_res);
+	ret = stm_get_stimulus_area(dev, &ch_res);
 	if (ret)
 		return ret;
 	drvdata->chs.phys = ch_res.start;
-- 
2.7.4


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[PATCH v4 13/30] coresight: tmc-etr: Rearrange probing default buffer size

[Suzuki K Poulose]

As we are about to refactor the platform specific handling,
make the default buffer size probing generic.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-tmc.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 3b39f43..9c5e615 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -378,6 +378,15 @@ static int tmc_etr_setup_caps(struct device *parent, u32 devid, void *dev_caps)
 	return rc;
 }
 
+static u32 tmc_etr_get_default_buffer_size(struct device *dev)
+{
+	u32 size;
+
+	if (fwnode_property_read_u32(dev->fwnode, "arm,buffer-size", &size))
+		size = SZ_1M;
+	return size;
+}
+
 static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 {
 	int ret = 0;
@@ -423,16 +432,10 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 	/* This device is not associated with a session */
 	drvdata->pid = -1;
 
-	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
-		if (np)
-			ret = of_property_read_u32(np,
-						   "arm,buffer-size",
-						   &drvdata->size);
-		if (ret)
-			drvdata->size = SZ_1M;
-	} else {
+	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
+		drvdata->size = tmc_etr_get_default_buffer_size(dev);
+	else
 		drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
-	}
 
 	desc.pdata = pdata;
 	desc.dev = dev;
-- 
2.7.4


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[PATCH v4 14/30] coresight: platform: Make memory allocation helper generic

[Suzuki K Poulose]

Rename the of_coresight_alloc_memory() => coresight_alloc_conns()
as it is independent of the underlying firmware type. This is in
preparation for the ACPI support.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-platform.c | 34 +++++++++++++-----------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 514cc2b..4c31299 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -17,6 +17,24 @@
 #include <linux/cpumask.h>
 #include <asm/smp_plat.h>
 
+/*
+ * coresight_alloc_conns: Allocate connections record for each output
+ * port from the device.
+ */
+static int coresight_alloc_conns(struct device *dev,
+				 struct coresight_platform_data *pdata)
+{
+	if (pdata->nr_outport) {
+		pdata->conns = devm_kzalloc(dev, pdata->nr_outport *
+					    sizeof(*pdata->conns),
+					    GFP_KERNEL);
+		if (!pdata->conns)
+			return -ENOMEM;
+	}
+
+	return 0;
+}
+
 #ifdef CONFIG_OF
 static int of_dev_node_match(struct device *dev, void *data)
 {
@@ -133,20 +151,6 @@ static void of_coresight_get_ports(const struct device_node *node,
 	}
 }
 
-static int of_coresight_alloc_memory(struct device *dev,
-			struct coresight_platform_data *pdata)
-{
-	if (pdata->nr_outport) {
-		pdata->conns = devm_kzalloc(dev, pdata->nr_outport *
-					    sizeof(*pdata->conns),
-					    GFP_KERNEL);
-		if (!pdata->conns)
-			return -ENOMEM;
-	}
-
-	return 0;
-}
-
 int of_coresight_get_cpu(const struct device_node *node)
 {
 	int cpu;
@@ -252,7 +256,7 @@ of_get_coresight_platform_data(struct device *dev,
 	if (!pdata->nr_outport)
 		return pdata;
 
-	ret = of_coresight_alloc_memory(dev, pdata);
+	ret = coresight_alloc_conns(dev, pdata);
 	if (ret)
 		return ERR_PTR(ret);
 
-- 
2.7.4


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

[PATCH v4 15/30] coresight: Make sure device uses DT for obsolete compatible check

[Suzuki K Poulose]

As we prepare to add support for ACPI bindings, let us make sure we do
the compatible check only if we are sure we are dealing with a DT based
system.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-funnel.c     | 3 ++-
 drivers/hwtracing/coresight/coresight-replicator.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index 6236a84..3423042 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -196,7 +196,8 @@ static int funnel_probe(struct device *dev, struct resource *res)
 		dev->platform_data = pdata;
 	}
 
-	if (of_device_is_compatible(np, "arm,coresight-funnel"))
+	if (is_of_node(dev_fwnode(dev)) &&
+	    of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
 		pr_warn_once("Uses OBSOLETE CoreSight funnel binding\n");
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index ee6ad34..7e05145 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -187,7 +187,8 @@ static int replicator_probe(struct device *dev, struct resource *res)
 		dev->platform_data = pdata;
 	}
 
-	if (of_device_is_compatible(np, "arm,coresight-replicator"))
+	if (is_of_node(dev_fwnode(dev)) &&
+	    of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
 		pr_warn_once("Uses OBSOLETE CoreSight replicator binding\n");
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
-- 
2.7.4


_______________________________________________
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[PATCH v4 16/30] coresight: Introduce generic platform data helper

[Suzuki K Poulose]

So far we have hard coded the DT platform parsing code in
every driver. Introduce generic helper to parse the information
provided by the firmware in a platform agnostic manner, in preparation
for the ACPI support.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-catu.c       | 13 ++---
 drivers/hwtracing/coresight/coresight-etb10.c      | 11 ++--
 drivers/hwtracing/coresight/coresight-etm3x.c      | 12 ++---
 drivers/hwtracing/coresight/coresight-etm4x.c      | 11 ++--
 drivers/hwtracing/coresight/coresight-funnel.c     | 11 ++--
 drivers/hwtracing/coresight/coresight-platform.c   | 58 ++++++++++++++++------
 drivers/hwtracing/coresight/coresight-replicator.c | 11 ++--
 drivers/hwtracing/coresight/coresight-stm.c        | 11 ++--
 drivers/hwtracing/coresight/coresight-tmc.c        | 13 ++---
 drivers/hwtracing/coresight/coresight-tpiu.c       | 11 ++--
 include/linux/coresight.h                          |  7 +--
 11 files changed, 83 insertions(+), 86 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 63109c9..799ba1d 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -503,17 +503,14 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
 	struct coresight_desc catu_desc;
 	struct coresight_platform_data *pdata = NULL;
 	struct device *dev = &adev->dev;
-	struct device_node *np = dev->of_node;
 	void __iomem *base;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
-		if (IS_ERR(pdata)) {
-			ret = PTR_ERR(pdata);
-			goto out;
-		}
-		dev->platform_data = pdata;
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto out;
 	}
+	dev->platform_data = pdata;
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata) {
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 3b333fb..612f1e9 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -725,14 +725,11 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 	struct etb_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
-		if (IS_ERR(pdata))
-			return PTR_ERR(pdata);
-		adev->dev.platform_data = pdata;
-	}
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
+	adev->dev.platform_data = pdata;
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index fa2f141..fa2164f 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -790,20 +790,16 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 	struct etm_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
-		if (IS_ERR(pdata))
-			return PTR_ERR(pdata);
-
-		adev->dev.platform_data = pdata;
-	}
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
 
+	adev->dev.platform_data = pdata;
 	drvdata->use_cp14 = fwnode_property_read_bool(dev->fwnode, "arm,cp14");
 	dev_set_drvdata(dev, drvdata);
 
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 77d1d837..4355b2e 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1084,18 +1084,15 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	struct etmv4_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
-		if (IS_ERR(pdata))
-			return PTR_ERR(pdata);
-		adev->dev.platform_data = pdata;
-	}
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
+	adev->dev.platform_data = pdata;
 
 	dev_set_drvdata(dev, drvdata);
 
diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index 3423042..fc033fd 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -187,14 +187,11 @@ static int funnel_probe(struct device *dev, struct resource *res)
 	struct coresight_platform_data *pdata = NULL;
 	struct funnel_drvdata *drvdata;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = dev->of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
-		if (IS_ERR(pdata))
-			return PTR_ERR(pdata);
-		dev->platform_data = pdata;
-	}
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
+	dev->platform_data = pdata;
 
 	if (is_of_node(dev_fwnode(dev)) &&
 	    of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 4c31299..5d78f4f 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -230,23 +230,16 @@ static int of_coresight_parse_endpoint(struct device *dev,
 	return ret;
 }
 
-struct coresight_platform_data *
-of_get_coresight_platform_data(struct device *dev,
-			       const struct device_node *node)
+static int of_get_coresight_platform_data(struct device *dev,
+					  struct coresight_platform_data *pdata)
 {
 	int ret = 0;
-	struct coresight_platform_data *pdata;
 	struct coresight_connection *conn;
 	struct device_node *ep = NULL;
 	const struct device_node *parent = NULL;
 	bool legacy_binding = false;
+	struct device_node *node = dev->of_node;
 
-	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
-	if (!pdata)
-		return ERR_PTR(-ENOMEM);
-
-	/* Use device name as sysfs handle */
-	pdata->name = dev_name(dev);
 	pdata->cpu = of_coresight_get_cpu(node);
 
 	/* Get the number of input and output port for this component */
@@ -254,11 +247,11 @@ of_get_coresight_platform_data(struct device *dev,
 
 	/* If there are no output connections, we are done */
 	if (!pdata->nr_outport)
-		return pdata;
+		return 0;
 
 	ret = coresight_alloc_conns(dev, pdata);
 	if (ret)
-		return ERR_PTR(ret);
+		return ret;
 
 	parent = of_coresight_get_output_ports_node(node);
 	/*
@@ -292,11 +285,46 @@ of_get_coresight_platform_data(struct device *dev,
 		case 0:
 			break;
 		default:
-			return ERR_PTR(ret);
+			return ret;
 		}
 	}
 
-	return pdata;
+	return 0;
+}
+#else
+static inline int
+of_get_coresight_platform_data(struct device *dev,
+			       struct coresight_platform_data *pdata)
+{
+	return -ENOENT;
 }
-EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
 #endif
+
+struct coresight_platform_data *
+coresight_get_platform_data(struct device *dev)
+{
+	int ret = -ENOENT;
+	struct coresight_platform_data *pdata;
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+
+	if (IS_ERR_OR_NULL(fwnode))
+		goto error;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	/* Use device name as sysfs handle */
+	pdata->name = dev_name(dev);
+
+	if (is_of_node(fwnode))
+		ret = of_get_coresight_platform_data(dev, pdata);
+
+	if (!ret)
+		return pdata;
+error:
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(coresight_get_platform_data);
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index 7e05145..054b335 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -177,15 +177,12 @@ static int replicator_probe(struct device *dev, struct resource *res)
 	struct coresight_platform_data *pdata = NULL;
 	struct replicator_drvdata *drvdata;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = dev->of_node;
 	void __iomem *base;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
-		if (IS_ERR(pdata))
-			return PTR_ERR(pdata);
-		dev->platform_data = pdata;
-	}
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
+	dev->platform_data = pdata;
 
 	if (is_of_node(dev_fwnode(dev)) &&
 	    of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 3992a35..9faa1ed 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -809,14 +809,11 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	struct resource ch_res;
 	size_t bitmap_size;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
-		if (IS_ERR(pdata))
-			return PTR_ERR(pdata);
-		adev->dev.platform_data = pdata;
-	}
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
+	adev->dev.platform_data = pdata;
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 9c5e615..be0bd98 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -397,16 +397,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 	struct tmc_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
-		if (IS_ERR(pdata)) {
-			ret = PTR_ERR(pdata);
-			goto out;
-		}
-		adev->dev.platform_data = pdata;
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto out;
 	}
+	adev->dev.platform_data = pdata;
 
 	ret = -ENOMEM;
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index 4dd3e7f..aec0ed7 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -124,14 +124,11 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	struct tpiu_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
-		if (IS_ERR(pdata))
-			return PTR_ERR(pdata);
-		adev->dev.platform_data = pdata;
-	}
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
+	dev->platform_data = pdata;
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 62a520d..e2b95e0 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -294,14 +294,11 @@ static inline void coresight_disclaim_device_unlocked(void __iomem *base) {}
 
 #ifdef CONFIG_OF
 extern int of_coresight_get_cpu(const struct device_node *node);
-extern struct coresight_platform_data *
-of_get_coresight_platform_data(struct device *dev,
-			       const struct device_node *node);
 #else
 static inline int of_coresight_get_cpu(const struct device_node *node)
 { return 0; }
-static inline struct coresight_platform_data *of_get_coresight_platform_data(
-	struct device *dev, const struct device_node *node) { return NULL; }
 #endif
 
+struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
+
 #endif
-- 
2.7.4


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[PATCH v4 17/30] coresight: Make device to CPU mapping generic

[Suzuki K Poulose]

The CoreSight components ETM and CPU-Debug are always associated
with CPUs. Replace the of_coresight_get_cpu() with a platform
agnostic helper, in preparation to add ACPI support.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-cpu-debug.c |  3 +--
 drivers/hwtracing/coresight/coresight-platform.c  | 18 +++++++++++++-----
 include/linux/coresight.h                         |  7 +------
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c
index e8819d7..07a1367 100644
--- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
+++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c
@@ -572,14 +572,13 @@ static int debug_probe(struct amba_device *adev, const struct amba_id *id)
 	struct device *dev = &adev->dev;
 	struct debug_drvdata *drvdata;
 	struct resource *res = &adev->res;
-	struct device_node *np = adev->dev.of_node;
 	int ret;
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 
-	drvdata->cpu = np ? of_coresight_get_cpu(np) : 0;
+	drvdata->cpu = coresight_get_cpu(dev);
 	if (per_cpu(debug_drvdata, drvdata->cpu)) {
 		dev_err(dev, "CPU%d drvdata has already been initialized\n",
 			drvdata->cpu);
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 5d78f4f..ba8c146 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -151,12 +151,14 @@ static void of_coresight_get_ports(const struct device_node *node,
 	}
 }
 
-int of_coresight_get_cpu(const struct device_node *node)
+static int of_coresight_get_cpu(struct device *dev)
 {
 	int cpu;
 	struct device_node *dn;
 
-	dn = of_parse_phandle(node, "cpu", 0);
+	if (!dev->of_node)
+		return 0;
+	dn = of_parse_phandle(dev->of_node, "cpu", 0);
 	/* Affinity defaults to CPU0 */
 	if (!dn)
 		return 0;
@@ -166,7 +168,6 @@ int of_coresight_get_cpu(const struct device_node *node)
 	/* Affinity to CPU0 if no cpu nodes are found */
 	return (cpu < 0) ? 0 : cpu;
 }
-EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
 
 /*
  * of_coresight_parse_endpoint : Parse the given output endpoint @ep
@@ -240,8 +241,6 @@ static int of_get_coresight_platform_data(struct device *dev,
 	bool legacy_binding = false;
 	struct device_node *node = dev->of_node;
 
-	pdata->cpu = of_coresight_get_cpu(node);
-
 	/* Get the number of input and output port for this component */
 	of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
 
@@ -300,6 +299,14 @@ of_get_coresight_platform_data(struct device *dev,
 }
 #endif
 
+int coresight_get_cpu(struct device *dev)
+{
+	if (is_of_node(dev->fwnode))
+		return of_coresight_get_cpu(dev);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(coresight_get_cpu);
+
 struct coresight_platform_data *
 coresight_get_platform_data(struct device *dev)
 {
@@ -318,6 +325,7 @@ coresight_get_platform_data(struct device *dev)
 
 	/* Use device name as sysfs handle */
 	pdata->name = dev_name(dev);
+	pdata->cpu = coresight_get_cpu(dev);
 
 	if (is_of_node(fwnode))
 		ret = of_get_coresight_platform_data(dev, pdata);
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index e2b95e0..98a4440 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -292,12 +292,7 @@ static inline void coresight_disclaim_device_unlocked(void __iomem *base) {}
 
 #endif
 
-#ifdef CONFIG_OF
-extern int of_coresight_get_cpu(const struct device_node *node);
-#else
-static inline int of_coresight_get_cpu(const struct device_node *node)
-{ return 0; }
-#endif
+extern int coresight_get_cpu(struct device *dev);
 
 struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
 
-- 
2.7.4


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[PATCH v4 18/30] coresight: Remove cpu field from platform data

[Suzuki K Poulose]

CPU field is only used by ETMs and there is a separate API
for fetching the same. So, let us use that instead of using
the common platform probing helper. Also, remove it from the
platform_data.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm3x.c    | 2 +-
 drivers/hwtracing/coresight/coresight-etm4x.c    | 2 +-
 drivers/hwtracing/coresight/coresight-platform.c | 1 -
 include/linux/coresight.h                        | 2 --
 4 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index fa2164f..722fab96 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -819,7 +819,7 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 			return ret;
 	}
 
-	drvdata->cpu = pdata ? pdata->cpu : 0;
+	drvdata->cpu = coresight_get_cpu(dev);
 
 	cpus_read_lock();
 	etmdrvdata[drvdata->cpu] = drvdata;
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 4355b2e..03576f3 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1105,7 +1105,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 
 	spin_lock_init(&drvdata->spinlock);
 
-	drvdata->cpu = pdata ? pdata->cpu : 0;
+	drvdata->cpu = coresight_get_cpu(dev);
 
 	cpus_read_lock();
 	etmdrvdata[drvdata->cpu] = drvdata;
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index ba8c146..541e500 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -325,7 +325,6 @@ coresight_get_platform_data(struct device *dev)
 
 	/* Use device name as sysfs handle */
 	pdata->name = dev_name(dev);
-	pdata->cpu = coresight_get_cpu(dev);
 
 	if (is_of_node(fwnode))
 		ret = of_get_coresight_platform_data(dev, pdata);
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 98a4440..bf241db 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -91,14 +91,12 @@ union coresight_dev_subtype {
 
 /**
  * struct coresight_platform_data - data harvested from the DT specification
- * @cpu:	the CPU a source belongs to. Only applicable for ETM/PTMs.
  * @name:	name of the component as shown under sysfs.
  * @nr_inport:	number of input ports for this component.
  * @nr_outport:	number of output ports for this component.
  * @conns:	Array of nr_outport connections from this component
  */
 struct coresight_platform_data {
-	int cpu;
 	const char *name;
 	int nr_inport;
 	int nr_outport;
-- 
2.7.4


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[PATCH v4 19/30] coresight: Remove name from platform description

[Suzuki K Poulose]

We are about to use a name independent of the parent AMBA device
name. As such, there is no need to have it in the platform description.
Let us move this to coresight description instead.

Reviewed-by: Mathieu Poirier <mathieu.poirier@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      | 3 ++-
 drivers/hwtracing/coresight/coresight-etm3x.c      | 1 +
 drivers/hwtracing/coresight/coresight-etm4x.c      | 1 +
 drivers/hwtracing/coresight/coresight-funnel.c     | 1 +
 drivers/hwtracing/coresight/coresight-platform.c   | 3 ---
 drivers/hwtracing/coresight/coresight-replicator.c | 2 ++
 drivers/hwtracing/coresight/coresight-stm.c        | 1 +
 drivers/hwtracing/coresight/coresight-tmc.c        | 5 +++--
 drivers/hwtracing/coresight/coresight-tpiu.c       | 1 +
 drivers/hwtracing/coresight/coresight.c            | 2 +-
 include/linux/coresight.h                          | 8 ++++----
 12 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 799ba1d..05c7304 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -551,6 +551,8 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
 	catu_desc.type = CORESIGHT_DEV_TYPE_HELPER;
 	catu_desc.subtype.helper_subtype = CORESIGHT_DEV_SUBTYPE_HELPER_CATU;
 	catu_desc.ops = &catu_ops;
+	catu_desc.name = dev_name(dev);
+
 	drvdata->csdev = coresight_register(&catu_desc);
 	if (IS_ERR(drvdata->csdev))
 		ret = PTR_ERR(drvdata->csdev);
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 612f1e9..5e7ecc6 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -770,12 +770,13 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.ops = &etb_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
+	desc.name = dev_name(dev);
 	desc.groups = coresight_etb_groups;
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev))
 		return PTR_ERR(drvdata->csdev);
 
-	drvdata->miscdev.name = pdata->name;
+	drvdata->miscdev.name = desc.name;
 	drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
 	drvdata->miscdev.fops = &etb_fops;
 	ret = misc_register(&drvdata->miscdev);
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index 722fab96..101fb01 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -854,6 +854,7 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.ops = &etm_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
+	desc.name = dev_name(dev);
 	desc.groups = coresight_etm_groups;
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 03576f3..8adc148 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1142,6 +1142,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.pdata = pdata;
 	desc.dev = dev;
 	desc.groups = coresight_etmv4_groups;
+	desc.name = dev_name(dev);
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
 		ret = PTR_ERR(drvdata->csdev);
diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index fc033fd..ded33f5 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -229,6 +229,7 @@ static int funnel_probe(struct device *dev, struct resource *res)
 	desc.ops = &funnel_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
+	desc.name = dev_name(dev);
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
 		ret = PTR_ERR(drvdata->csdev);
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 541e500..f500de6 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -323,9 +323,6 @@ coresight_get_platform_data(struct device *dev)
 		goto error;
 	}
 
-	/* Use device name as sysfs handle */
-	pdata->name = dev_name(dev);
-
 	if (is_of_node(fwnode))
 		ret = of_get_coresight_platform_data(dev, pdata);
 
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index 054b335..f28bafd 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -220,6 +220,8 @@ static int replicator_probe(struct device *dev, struct resource *res)
 	desc.ops = &replicator_cs_ops;
 	desc.pdata = dev->platform_data;
 	desc.dev = dev;
+	desc.name = dev_name(dev);
+
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
 		ret = PTR_ERR(drvdata->csdev);
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 9faa1ed..02031d9 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -871,6 +871,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.ops = &stm_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
+	desc.name = dev_name(dev);
 	desc.groups = coresight_stm_groups;
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index be0bd98..44a5719 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -437,6 +437,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.pdata = pdata;
 	desc.dev = dev;
 	desc.groups = coresight_tmc_groups;
+	desc.name = dev_name(dev);
 
 	switch (drvdata->config_type) {
 	case TMC_CONFIG_TYPE_ETB:
@@ -461,7 +462,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 		desc.ops = &tmc_etf_cs_ops;
 		break;
 	default:
-		pr_err("%s: Unsupported TMC config\n", pdata->name);
+		pr_err("%s: Unsupported TMC config\n", desc.name);
 		ret = -EINVAL;
 		goto out;
 	}
@@ -472,7 +473,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 		goto out;
 	}
 
-	drvdata->miscdev.name = pdata->name;
+	drvdata->miscdev.name = desc.name;
 	drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
 	drvdata->miscdev.fops = &tmc_fops;
 	ret = misc_register(&drvdata->miscdev);
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index aec0ed7..d8a2e39 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -157,6 +157,7 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.ops = &tpiu_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
+	desc.name = dev_name(dev);
 	drvdata->csdev = coresight_register(&desc);
 
 	if (!IS_ERR(drvdata->csdev)) {
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 4b13028..04b5d3c 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1199,7 +1199,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 	csdev->dev.parent = desc->dev;
 	csdev->dev.release = coresight_device_release;
 	csdev->dev.bus = &coresight_bustype;
-	dev_set_name(&csdev->dev, "%s", desc->pdata->name);
+	dev_set_name(&csdev->dev, "%s", desc->name);
 
 	ret = device_register(&csdev->dev);
 	if (ret) {
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index bf241db..298db20 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -91,13 +91,11 @@ union coresight_dev_subtype {
 
 /**
  * struct coresight_platform_data - data harvested from the DT specification
- * @name:	name of the component as shown under sysfs.
  * @nr_inport:	number of input ports for this component.
  * @nr_outport:	number of output ports for this component.
  * @conns:	Array of nr_outport connections from this component
  */
 struct coresight_platform_data {
-	const char *name;
 	int nr_inport;
 	int nr_outport;
 	struct coresight_connection *conns;
@@ -108,11 +106,12 @@ struct coresight_platform_data {
  * @type:	as defined by @coresight_dev_type.
  * @subtype:	as defined by @coresight_dev_subtype.
  * @ops:	generic operations for this component, as defined
-		by @coresight_ops.
+ *		by @coresight_ops.
  * @pdata:	platform data collected from DT.
  * @dev:	The device entity associated to this component.
  * @groups:	operations specific to this component. These will end up
-		in the component's sysfs sub-directory.
+ *		in the component's sysfs sub-directory.
+ * @name:	name for the coresight device, also shown under sysfs.
  */
 struct coresight_desc {
 	enum coresight_dev_type type;
@@ -121,6 +120,7 @@ struct coresight_desc {
 	struct coresight_platform_data *pdata;
 	struct device *dev;
 	const struct attribute_group **groups;
+	const char *name;
 };
 
 /**
-- 
2.7.4


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[PATCH v4 20/30] coresight: Cleanup coresight_remove_conns

[Suzuki K Poulose]

When a device is unregistered, we remove all connection
references to it, by searching the connection records of
all devices in the coresight bus, via coresight_remove_conns.
We could avoid searching if this device doesn't have an input
port (e.g, a source). Also document the purpose of the function.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 04b5d3c..068bd2f 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1096,10 +1096,21 @@ static int coresight_remove_match(struct device *dev, void *data)
 	return 0;
 }
 
+/*
+ * coresight_remove_conns - Remove references to this given devices
+ * from the connections of other devices.
+ */
 static void coresight_remove_conns(struct coresight_device *csdev)
 {
-	bus_for_each_dev(&coresight_bustype, NULL,
-			 csdev, coresight_remove_match);
+	/*
+	 * Another device will point to this device only if there is
+	 * an output port connected to this one. i.e, if the device
+	 * doesn't have at least one input port, there is no point
+	 * in searching all the devices.
+	 */
+	if (csdev->nr_inport)
+		bus_for_each_dev(&coresight_bustype, NULL,
+				 csdev, coresight_remove_match);
 }
 
 /**
-- 
2.7.4


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[PATCH v4 21/30] coresight: Reuse platform data structure for connection tracking

[Suzuki K Poulose]

The platform specific information describes the connections and
the ports of a given coresigh device. This information is also
recorded in the coresight device as separate fields. Let us reuse
the original platform description to streamline the handling
of the data.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-tmc-etr.c |  4 +--
 drivers/hwtracing/coresight/coresight.c         | 46 ++++++++++++-------------
 include/linux/coresight.h                       |  8 ++---
 3 files changed, 27 insertions(+), 31 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 01718cb..793639f 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -756,8 +756,8 @@ tmc_etr_get_catu_device(struct tmc_drvdata *drvdata)
 	if (!IS_ENABLED(CONFIG_CORESIGHT_CATU))
 		return NULL;
 
-	for (i = 0; i < etr->nr_outport; i++) {
-		tmp = etr->conns[i].child_dev;
+	for (i = 0; i < etr->pdata->nr_outport; i++) {
+		tmp = etr->pdata->conns[i].child_dev;
 		if (tmp && coresight_is_catu_device(tmp))
 			return tmp;
 	}
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 068bd2f..96e1515 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -100,8 +100,8 @@ static int coresight_find_link_inport(struct coresight_device *csdev,
 	int i;
 	struct coresight_connection *conn;
 
-	for (i = 0; i < parent->nr_outport; i++) {
-		conn = &parent->conns[i];
+	for (i = 0; i < parent->pdata->nr_outport; i++) {
+		conn = &parent->pdata->conns[i];
 		if (conn->child_dev == csdev)
 			return conn->child_port;
 	}
@@ -118,8 +118,8 @@ static int coresight_find_link_outport(struct coresight_device *csdev,
 	int i;
 	struct coresight_connection *conn;
 
-	for (i = 0; i < csdev->nr_outport; i++) {
-		conn = &csdev->conns[i];
+	for (i = 0; i < csdev->pdata->nr_outport; i++) {
+		conn = &csdev->pdata->conns[i];
 		if (conn->child_dev == child)
 			return conn->outport;
 	}
@@ -306,10 +306,10 @@ static void coresight_disable_link(struct coresight_device *csdev,
 
 	if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
 		refport = inport;
-		nr_conns = csdev->nr_inport;
+		nr_conns = csdev->pdata->nr_inport;
 	} else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
 		refport = outport;
-		nr_conns = csdev->nr_outport;
+		nr_conns = csdev->pdata->nr_outport;
 	} else {
 		refport = 0;
 		nr_conns = 1;
@@ -595,9 +595,10 @@ static void coresight_grab_device(struct coresight_device *csdev)
 {
 	int i;
 
-	for (i = 0; i < csdev->nr_outport; i++) {
-		struct coresight_device *child = csdev->conns[i].child_dev;
+	for (i = 0; i < csdev->pdata->nr_outport; i++) {
+		struct coresight_device *child;
 
+		child  = csdev->pdata->conns[i].child_dev;
 		if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
 			pm_runtime_get_sync(child->dev.parent);
 	}
@@ -613,9 +614,10 @@ static void coresight_drop_device(struct coresight_device *csdev)
 	int i;
 
 	pm_runtime_put(csdev->dev.parent);
-	for (i = 0; i < csdev->nr_outport; i++) {
-		struct coresight_device *child = csdev->conns[i].child_dev;
+	for (i = 0; i < csdev->pdata->nr_outport; i++) {
+		struct coresight_device *child;
 
+		child  = csdev->pdata->conns[i].child_dev;
 		if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
 			pm_runtime_put(child->dev.parent);
 	}
@@ -645,9 +647,10 @@ static int _coresight_build_path(struct coresight_device *csdev,
 		goto out;
 
 	/* Not a sink - recursively explore each port found on this element */
-	for (i = 0; i < csdev->nr_outport; i++) {
-		struct coresight_device *child_dev = csdev->conns[i].child_dev;
+	for (i = 0; i < csdev->pdata->nr_outport; i++) {
+		struct coresight_device *child_dev;
 
+		child_dev = csdev->pdata->conns[i].child_dev;
 		if (child_dev &&
 		    _coresight_build_path(child_dev, sink, path) == 0) {
 			found = true;
@@ -1000,8 +1003,8 @@ static int coresight_orphan_match(struct device *dev, void *data)
 	 * Circle throuch all the connection of that component.  If we find
 	 * an orphan connection whose name matches @csdev, link it.
 	 */
-	for (i = 0; i < i_csdev->nr_outport; i++) {
-		conn = &i_csdev->conns[i];
+	for (i = 0; i < i_csdev->pdata->nr_outport; i++) {
+		conn = &i_csdev->pdata->conns[i];
 
 		/* We have found at least one orphan connection */
 		if (conn->child_dev == NULL) {
@@ -1040,8 +1043,8 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev)
 {
 	int i;
 
-	for (i = 0; i < csdev->nr_outport; i++) {
-		struct coresight_connection *conn = &csdev->conns[i];
+	for (i = 0; i < csdev->pdata->nr_outport; i++) {
+		struct coresight_connection *conn = &csdev->pdata->conns[i];
 		struct device *dev = NULL;
 
 		if (conn->child_name)
@@ -1075,8 +1078,8 @@ static int coresight_remove_match(struct device *dev, void *data)
 	 * Circle throuch all the connection of that component.  If we find
 	 * a connection whose name matches @csdev, remove it.
 	 */
-	for (i = 0; i < iterator->nr_outport; i++) {
-		conn = &iterator->conns[i];
+	for (i = 0; i < iterator->pdata->nr_outport; i++) {
+		conn = &iterator->pdata->conns[i];
 
 		if (conn->child_dev == NULL)
 			continue;
@@ -1108,7 +1111,7 @@ static void coresight_remove_conns(struct coresight_device *csdev)
 	 * doesn't have at least one input port, there is no point
 	 * in searching all the devices.
 	 */
-	if (csdev->nr_inport)
+	if (csdev->pdata->nr_inport)
 		bus_for_each_dev(&coresight_bustype, NULL,
 				 csdev, coresight_remove_match);
 }
@@ -1195,10 +1198,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 
 	csdev->refcnt = refcnts;
 
-	csdev->nr_inport = desc->pdata->nr_inport;
-	csdev->nr_outport = desc->pdata->nr_outport;
-
-	csdev->conns = desc->pdata->conns;
+	csdev->pdata = desc->pdata;
 
 	csdev->type = desc->type;
 	csdev->subtype = desc->subtype;
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 298db20..b67d507 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -140,9 +140,7 @@ struct coresight_connection {
 
 /**
  * struct coresight_device - representation of a device as used by the framework
- * @conns:	array of coresight_connections associated to this component.
- * @nr_inport:	number of input port associated to this component.
- * @nr_outport:	number of output port associated to this component.
+ * @pdata:	Platform data with device connections associated to this device.
  * @type:	as defined by @coresight_dev_type.
  * @subtype:	as defined by @coresight_dev_subtype.
  * @ops:	generic operations for this component, as defined
@@ -157,9 +155,7 @@ struct coresight_connection {
  * @ea:		Device attribute for sink representation under PMU directory.
  */
 struct coresight_device {
-	struct coresight_connection *conns;
-	int nr_inport;
-	int nr_outport;
+	struct coresight_platform_data *pdata;
 	enum coresight_dev_type type;
 	union coresight_dev_subtype subtype;
 	const struct coresight_ops *ops;
-- 
2.7.4


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

[PATCH v4 22/30] coresight: Rearrange platform data probing

[Suzuki K Poulose]

We are about to introduce methods to clean up the platform data
as we switch to tracking the device reference from "name" to "fwnode
handles" for device connections. This requires us to drop the fwnode
handle references when the data is no longer required - i.e, when
the device probe fails or the device gets unregistered.

In order to consolidate the invocation of the cleanup, we delay the
platform probing to the very last minute, possibly before invoking
the coresight_register. Then, we leave the coresight core code to
do the clean up. i.e, if the coresight_register fails, it takes
care of freeing the data. Otherwise, coresight_unregister will
do the necessary operations.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-catu.c       | 14 +++++++-------
 drivers/hwtracing/coresight/coresight-etb10.c      | 10 +++++-----
 drivers/hwtracing/coresight/coresight-etm3x.c      | 12 +++++++-----
 drivers/hwtracing/coresight/coresight-etm4x.c      | 12 +++++++-----
 drivers/hwtracing/coresight/coresight-funnel.c     | 12 +++++++-----
 drivers/hwtracing/coresight/coresight-replicator.c | 12 +++++++-----
 drivers/hwtracing/coresight/coresight-stm.c        | 11 +++++++----
 drivers/hwtracing/coresight/coresight-tmc.c        | 16 ++++++++--------
 drivers/hwtracing/coresight/coresight-tpiu.c       | 10 +++++-----
 9 files changed, 60 insertions(+), 49 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 05c7304..1c1ad12 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -505,13 +505,6 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
 	struct device *dev = &adev->dev;
 	void __iomem *base;
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata)) {
-		ret = PTR_ERR(pdata);
-		goto out;
-	}
-	dev->platform_data = pdata;
-
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata) {
 		ret = -ENOMEM;
@@ -544,6 +537,13 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
 	if (ret)
 		goto out;
 
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto out;
+	}
+	dev->platform_data = pdata;
+
 	drvdata->base = base;
 	catu_desc.pdata = pdata;
 	catu_desc.dev = dev;
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 5e7ecc6..09df827 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -726,11 +726,6 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata))
-		return PTR_ERR(pdata);
-	adev->dev.platform_data = pdata;
-
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -765,6 +760,11 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 	/* This device is not associated with a session */
 	drvdata->pid = -1;
 
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
+	adev->dev.platform_data = pdata;
+
 	desc.type = CORESIGHT_DEV_TYPE_SINK;
 	desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 	desc.ops = &etb_cs_ops;
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index 101fb01..f2d4616 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -795,11 +795,6 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 	if (!drvdata)
 		return -ENOMEM;
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata))
-		return PTR_ERR(pdata);
-
-	adev->dev.platform_data = pdata;
 	drvdata->use_cp14 = fwnode_property_read_bool(dev->fwnode, "arm,cp14");
 	dev_set_drvdata(dev, drvdata);
 
@@ -849,6 +844,13 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 	etm_init_trace_id(drvdata);
 	etm_set_default(&drvdata->config);
 
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto err_arch_supported;
+	}
+	adev->dev.platform_data = pdata;
+
 	desc.type = CORESIGHT_DEV_TYPE_SOURCE;
 	desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
 	desc.ops = &etm_cs_ops;
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 8adc148..1609da1 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1089,11 +1089,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	if (!drvdata)
 		return -ENOMEM;
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata))
-		return PTR_ERR(pdata);
-	adev->dev.platform_data = pdata;
-
 	dev_set_drvdata(dev, drvdata);
 
 	/* Validity for the resource is already checked by the AMBA core */
@@ -1136,6 +1131,13 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	etm4_init_trace_id(drvdata);
 	etm4_set_default(&drvdata->config);
 
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto err_arch_supported;
+	}
+	adev->dev.platform_data = pdata;
+
 	desc.type = CORESIGHT_DEV_TYPE_SOURCE;
 	desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
 	desc.ops = &etm4_cs_ops;
diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index ded33f5..75fa2d3 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -188,11 +188,6 @@ static int funnel_probe(struct device *dev, struct resource *res)
 	struct funnel_drvdata *drvdata;
 	struct coresight_desc desc = { 0 };
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata))
-		return PTR_ERR(pdata);
-	dev->platform_data = pdata;
-
 	if (is_of_node(dev_fwnode(dev)) &&
 	    of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
 		pr_warn_once("Uses OBSOLETE CoreSight funnel binding\n");
@@ -224,6 +219,13 @@ static int funnel_probe(struct device *dev, struct resource *res)
 
 	dev_set_drvdata(dev, drvdata);
 
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto out_disable_clk;
+	}
+	dev->platform_data = pdata;
+
 	desc.type = CORESIGHT_DEV_TYPE_LINK;
 	desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
 	desc.ops = &funnel_cs_ops;
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index f28bafd..64dfde7 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -179,11 +179,6 @@ static int replicator_probe(struct device *dev, struct resource *res)
 	struct coresight_desc desc = { 0 };
 	void __iomem *base;
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata))
-		return PTR_ERR(pdata);
-	dev->platform_data = pdata;
-
 	if (is_of_node(dev_fwnode(dev)) &&
 	    of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
 		pr_warn_once("Uses OBSOLETE CoreSight replicator binding\n");
@@ -215,6 +210,13 @@ static int replicator_probe(struct device *dev, struct resource *res)
 
 	dev_set_drvdata(dev, drvdata);
 
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto out_disable_clk;
+	}
+	dev->platform_data = pdata;
+
 	desc.type = CORESIGHT_DEV_TYPE_LINK;
 	desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 	desc.ops = &replicator_cs_ops;
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 02031d9..03528f3 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -810,10 +810,6 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	size_t bitmap_size;
 	struct coresight_desc desc = { 0 };
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata))
-		return PTR_ERR(pdata);
-	adev->dev.platform_data = pdata;
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -866,6 +862,13 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 		return -EPROBE_DEFER;
 	}
 
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto stm_unregister;
+	}
+	adev->dev.platform_data = pdata;
+
 	desc.type = CORESIGHT_DEV_TYPE_SOURCE;
 	desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE;
 	desc.ops = &stm_cs_ops;
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 44a5719..212630e 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -398,13 +398,6 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata)) {
-		ret = PTR_ERR(pdata);
-		goto out;
-	}
-	adev->dev.platform_data = pdata;
-
 	ret = -ENOMEM;
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
@@ -434,7 +427,6 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 	else
 		drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
 
-	desc.pdata = pdata;
 	desc.dev = dev;
 	desc.groups = coresight_tmc_groups;
 	desc.name = dev_name(dev);
@@ -467,6 +459,14 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 		goto out;
 	}
 
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata)) {
+		ret = PTR_ERR(pdata);
+		goto out;
+	}
+	adev->dev.platform_data = pdata;
+	desc.pdata = pdata;
+
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
 		ret = PTR_ERR(drvdata->csdev);
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index d8a2e39..b699d61 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -125,11 +125,6 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata))
-		return PTR_ERR(pdata);
-	dev->platform_data = pdata;
-
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -152,6 +147,11 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	/* Disable tpiu to support older devices */
 	tpiu_disable_hw(drvdata);
 
+	pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(pdata))
+		return PTR_ERR(pdata);
+	dev->platform_data = pdata;
+
 	desc.type = CORESIGHT_DEV_TYPE_SINK;
 	desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
 	desc.ops = &tpiu_cs_ops;
-- 
2.7.4


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

[PATCH v4 23/30] coresight: Add support for releasing platform specific data

[Suzuki K Poulose]

Add a helper to clean up the platform specific data provided
by the firmware. This will be later used for dropping the necessary
references when we switch to the fwnode handles for tracking
connections.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-platform.c | 6 +++++-
 drivers/hwtracing/coresight/coresight-priv.h     | 4 ++++
 drivers/hwtracing/coresight/coresight.c          | 3 +++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index f500de6..53d6eed 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -17,6 +17,7 @@
 #include <linux/cpumask.h>
 #include <asm/smp_plat.h>
 
+#include "coresight-priv.h"
 /*
  * coresight_alloc_conns: Allocate connections record for each output
  * port from the device.
@@ -311,7 +312,7 @@ struct coresight_platform_data *
 coresight_get_platform_data(struct device *dev)
 {
 	int ret = -ENOENT;
-	struct coresight_platform_data *pdata;
+	struct coresight_platform_data *pdata = NULL;
 	struct fwnode_handle *fwnode = dev_fwnode(dev);
 
 	if (IS_ERR_OR_NULL(fwnode))
@@ -329,6 +330,9 @@ coresight_get_platform_data(struct device *dev)
 	if (!ret)
 		return pdata;
 error:
+	if (!IS_ERR_OR_NULL(pdata))
+		/* Cleanup the connection information */
+		coresight_release_platform_data(pdata);
 	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(coresight_get_platform_data);
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index e0684d0..c216421 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -200,4 +200,8 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
 	return 0;
 }
 
+static inline void
+coresight_release_platform_data(struct coresight_platform_data *pdata)
+{}
+
 #endif
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 96e1515..526141c 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1250,6 +1250,8 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 err_free_csdev:
 	kfree(csdev);
 err_out:
+	/* Cleanup the connection information */
+	coresight_release_platform_data(desc->pdata);
 	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(coresight_register);
@@ -1259,6 +1261,7 @@ void coresight_unregister(struct coresight_device *csdev)
 	etm_perf_del_symlink_sink(csdev);
 	/* Remove references of that device in the topology */
 	coresight_remove_conns(csdev);
+	coresight_release_platform_data(csdev->pdata);
 	device_unregister(&csdev->dev);
 }
 EXPORT_SYMBOL_GPL(coresight_unregister);
-- 
2.7.4


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

[PATCH v4 24/30] coresight: platform: Use fwnode handle for device search

[Suzuki K Poulose]

We match of_node while searching for a device. Make this
more generic in preparation for the ACPI support by using
fwnode_handle.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-platform.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 53d6eed..4394095 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -36,14 +36,13 @@ static int coresight_alloc_conns(struct device *dev,
 	return 0;
 }
 
-#ifdef CONFIG_OF
-static int of_dev_node_match(struct device *dev, void *data)
+static int coresight_device_fwnode_match(struct device *dev, void *fwnode)
 {
-	return dev->of_node == data;
+	return dev_fwnode(dev) == fwnode;
 }
 
 static struct device *
-of_coresight_get_endpoint_device(struct device_node *endpoint)
+coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
 {
 	struct device *dev = NULL;
 
@@ -52,7 +51,7 @@ of_coresight_get_endpoint_device(struct device_node *endpoint)
 	 * platform bus.
 	 */
 	dev = bus_find_device(&platform_bus_type, NULL,
-			      endpoint, of_dev_node_match);
+			      fwnode, coresight_device_fwnode_match);
 	if (dev)
 		return dev;
 
@@ -61,9 +60,10 @@ of_coresight_get_endpoint_device(struct device_node *endpoint)
 	 * looking for the device that matches the endpoint node.
 	 */
 	return bus_find_device(&amba_bustype, NULL,
-			       endpoint, of_dev_node_match);
+			       fwnode, coresight_device_fwnode_match);
 }
 
+#ifdef CONFIG_OF
 static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
 {
 	return of_property_read_bool(ep, "slave-mode");
@@ -191,6 +191,7 @@ static int of_coresight_parse_endpoint(struct device *dev,
 	struct device_node *rparent = NULL;
 	struct device_node *rep = NULL;
 	struct device *rdev = NULL;
+	struct fwnode_handle *rdev_fwnode;
 
 	do {
 		/* Parse the local port details */
@@ -209,8 +210,9 @@ static int of_coresight_parse_endpoint(struct device *dev,
 		if (of_graph_parse_endpoint(rep, &rendpoint))
 			break;
 
+		rdev_fwnode = of_fwnode_handle(rparent);
 		/* If the remote device is not available, defer probing */
-		rdev = of_coresight_get_endpoint_device(rparent);
+		rdev = coresight_find_device_by_fwnode(rdev_fwnode);
 		if (!rdev) {
 			ret = -EPROBE_DEFER;
 			break;
-- 
2.7.4


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

[PATCH v4 25/30] coresight: Use fwnode handle instead of device names

[Suzuki K Poulose]

We rely on the device names to find a CoreSight device on the
coresight bus. The device name however is obtained from the platform,
which is bound to the real platform/amba device. As we are about
to use different naming scheme for the coresight devices, we can't
rely on the platform device name to find the corresponding
coresight device. Instead we use the platform agnostic
"fwnode handle" of the parent device to find the devices.
We also reuse the same fwnode as the parent for the Coresight
device we create.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-platform.c | 14 +++++---
 drivers/hwtracing/coresight/coresight-priv.h     |  6 ++--
 drivers/hwtracing/coresight/coresight.c          | 42 +++++++++++++++++++-----
 include/linux/coresight.h                        |  4 +--
 4 files changed, 49 insertions(+), 17 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 4394095..49112a5 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -36,7 +36,7 @@ static int coresight_alloc_conns(struct device *dev,
 	return 0;
 }
 
-static int coresight_device_fwnode_match(struct device *dev, void *fwnode)
+int coresight_device_fwnode_match(struct device *dev, void *fwnode)
 {
 	return dev_fwnode(dev) == fwnode;
 }
@@ -219,9 +219,15 @@ static int of_coresight_parse_endpoint(struct device *dev,
 		}
 
 		conn->outport = endpoint.port;
-		conn->child_name = devm_kstrdup(dev,
-						dev_name(rdev),
-						GFP_KERNEL);
+		/*
+		 * Hold the refcount to the target device. This could be
+		 * released via:
+		 * 1) coresight_release_platform_data() if the probe fails or
+		 *    this device is unregistered.
+		 * 2) While removing the target device via
+		 *    coresight_remove_match()
+		 */
+		conn->child_fwnode = fwnode_handle_get(rdev_fwnode);
 		conn->child_port = rendpoint.port;
 		/* Connection record updated */
 		ret = 1;
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index c216421..8b07fe5 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -200,8 +200,8 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
 	return 0;
 }
 
-static inline void
-coresight_release_platform_data(struct coresight_platform_data *pdata)
-{}
+void coresight_release_platform_data(struct coresight_platform_data *pdata);
+
+int coresight_device_fwnode_match(struct device *dev, void *fwnode);
 
 #endif
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 526141c..1287778 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -978,6 +978,7 @@ static void coresight_device_release(struct device *dev)
 {
 	struct coresight_device *csdev = to_coresight_device(dev);
 
+	fwnode_handle_put(csdev->dev.fwnode);
 	kfree(csdev->refcnt);
 	kfree(csdev);
 }
@@ -1009,13 +1010,11 @@ static int coresight_orphan_match(struct device *dev, void *data)
 		/* We have found at least one orphan connection */
 		if (conn->child_dev == NULL) {
 			/* Does it match this newly added device? */
-			if (conn->child_name &&
-			    !strcmp(dev_name(&csdev->dev), conn->child_name)) {
+			if (conn->child_fwnode == csdev->dev.fwnode)
 				conn->child_dev = csdev;
-			} else {
+			else
 				/* This component still has an orphan */
 				still_orphan = true;
-			}
 		}
 	}
 
@@ -1047,9 +1046,9 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev)
 		struct coresight_connection *conn = &csdev->pdata->conns[i];
 		struct device *dev = NULL;
 
-		if (conn->child_name)
-			dev = bus_find_device_by_name(&coresight_bustype, NULL,
-						      conn->child_name);
+		dev = bus_find_device(&coresight_bustype, NULL,
+				      (void *)conn->child_fwnode,
+				      coresight_device_fwnode_match);
 		if (dev) {
 			conn->child_dev = to_coresight_device(dev);
 			/* and put reference from 'bus_find_device()' */
@@ -1084,9 +1083,15 @@ static int coresight_remove_match(struct device *dev, void *data)
 		if (conn->child_dev == NULL)
 			continue;
 
-		if (!strcmp(dev_name(&csdev->dev), conn->child_name)) {
+		if (csdev->dev.fwnode == conn->child_fwnode) {
 			iterator->orphan = true;
 			conn->child_dev = NULL;
+			/*
+			 * Drop the reference to the handle for the remote
+			 * device acquired in parsing the connections from
+			 * platform data.
+			 */
+			fwnode_handle_put(conn->child_fwnode);
 			/* No need to continue */
 			break;
 		}
@@ -1166,6 +1171,22 @@ static int __init coresight_init(void)
 }
 postcore_initcall(coresight_init);
 
+/*
+ * coresight_release_platform_data: Release references to the devices connected
+ * to the output port of this device.
+ */
+void coresight_release_platform_data(struct coresight_platform_data *pdata)
+{
+	int i;
+
+	for (i = 0; i < pdata->nr_outport; i++) {
+		if (pdata->conns[i].child_fwnode) {
+			fwnode_handle_put(pdata->conns[i].child_fwnode);
+			pdata->conns[i].child_fwnode = NULL;
+		}
+	}
+}
+
 struct coresight_device *coresight_register(struct coresight_desc *desc)
 {
 	int ret;
@@ -1210,6 +1231,11 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 	csdev->dev.parent = desc->dev;
 	csdev->dev.release = coresight_device_release;
 	csdev->dev.bus = &coresight_bustype;
+	/*
+	 * Hold the reference to our parent device. This will be
+	 * dropped only in coresight_device_release().
+	 */
+	csdev->dev.fwnode = fwnode_handle_get(dev_fwnode(desc->dev));
 	dev_set_name(&csdev->dev, "%s", desc->name);
 
 	ret = device_register(&csdev->dev);
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index b67d507..b40544b 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -126,15 +126,15 @@ struct coresight_desc {
 /**
  * struct coresight_connection - representation of a single connection
  * @outport:	a connection's output port number.
- * @chid_name:	remote component's name.
  * @child_port:	remote component's port number @output is connected to.
+ * @chid_fwnode: remote component's fwnode handle.
  * @child_dev:	a @coresight_device representation of the component
 		connected to @outport.
  */
 struct coresight_connection {
 	int outport;
-	const char *child_name;
 	int child_port;
+	struct fwnode_handle *child_fwnode;
 	struct coresight_device *child_dev;
 };
 
-- 
2.7.4


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

[PATCH v4 26/30] coresight: Use platform agnostic names

[Suzuki K Poulose]

So far we have reused the name of the "platform" device for
the CoreSight device. But this is not very intuitive when
we move to ACPI. Also, the ACPI device names have ":" in them
(e.g, ARMHC97C:01), which the perf tool doesn't like very much.
This patch introduces a generic naming scheme, givin more intuitive
names for the devices that appear on the CoreSight bus.
The names follow the pattern "prefix" followed by "index" (e.g, etm5).
We maintain a list of allocated devices per "prefix" to make sure
we don't allocate a new name when it is reprobed (e.g, due to
unsatisifed device dependencies). So, we maintain the list
of "fwnodes" of the parent devices to allocate a consistent name.
All devices except the ETMs get an index allocated in the order
of probing. ETMs get an index based on the CPU they are attached to.

TMC devices are named using "tmc_etf", "tmc_etb", and "tmc_etr"
prefixes depending on the configuration of the device.

The replicators and funnels are not classified as dynamic/static
anymore. One could easily figure that out by checking the presence
of "mgmt" registers under sysfs.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-catu.c       |  7 ++-
 drivers/hwtracing/coresight/coresight-etb10.c      |  7 ++-
 drivers/hwtracing/coresight/coresight-etm3x.c      |  4 +-
 drivers/hwtracing/coresight/coresight-etm4x.c      |  4 +-
 drivers/hwtracing/coresight/coresight-funnel.c     |  7 ++-
 drivers/hwtracing/coresight/coresight-replicator.c |  7 ++-
 drivers/hwtracing/coresight/coresight-stm.c        | 12 +++--
 drivers/hwtracing/coresight/coresight-tmc.c        | 15 +++++-
 drivers/hwtracing/coresight/coresight-tpiu.c       |  7 ++-
 drivers/hwtracing/coresight/coresight.c            | 58 ++++++++++++++++++++++
 include/linux/coresight.h                          | 25 +++++++++-
 11 files changed, 141 insertions(+), 12 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 1c1ad12..16ebf38 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -28,6 +28,8 @@
 #define catu_dbg(x, ...) do {} while (0)
 #endif
 
+DEFINE_CORESIGHT_DEVLIST(catu_devs, "catu");
+
 struct catu_etr_buf {
 	struct tmc_sg_table *catu_table;
 	dma_addr_t sladdr;
@@ -505,6 +507,10 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
 	struct device *dev = &adev->dev;
 	void __iomem *base;
 
+	catu_desc.name = coresight_alloc_device_name(&catu_devs, dev);
+	if (!catu_desc.name)
+		return -ENOMEM;
+
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata) {
 		ret = -ENOMEM;
@@ -551,7 +557,6 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
 	catu_desc.type = CORESIGHT_DEV_TYPE_HELPER;
 	catu_desc.subtype.helper_subtype = CORESIGHT_DEV_SUBTYPE_HELPER_CATU;
 	catu_desc.ops = &catu_ops;
-	catu_desc.name = dev_name(dev);
 
 	drvdata->csdev = coresight_register(&catu_desc);
 	if (IS_ERR(drvdata->csdev))
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 09df827..bdd4fd5 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -63,6 +63,8 @@
 #define ETB_FFSR_BIT		1
 #define ETB_FRAME_SIZE_WORDS	4
 
+DEFINE_CORESIGHT_DEVLIST(etb_devs, "etb");
+
 /**
  * struct etb_drvdata - specifics associated to an ETB component
  * @base:	memory mapped base address for this component.
@@ -726,6 +728,10 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
 
+	desc.name = coresight_alloc_device_name(&etb_devs, dev);
+	if (!desc.name)
+		return -ENOMEM;
+
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -770,7 +776,6 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.ops = &etb_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
-	desc.name = dev_name(dev);
 	desc.groups = coresight_etb_groups;
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev))
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index f2d4616..bed7291 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -815,6 +815,9 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 	}
 
 	drvdata->cpu = coresight_get_cpu(dev);
+	desc.name  = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
+	if (!desc.name)
+		return -ENOMEM;
 
 	cpus_read_lock();
 	etmdrvdata[drvdata->cpu] = drvdata;
@@ -856,7 +859,6 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.ops = &etm_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
-	desc.name = dev_name(dev);
 	desc.groups = coresight_etm_groups;
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 1609da1..7fe2661 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -1101,6 +1101,9 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	spin_lock_init(&drvdata->spinlock);
 
 	drvdata->cpu = coresight_get_cpu(dev);
+	desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
+	if (!desc.name)
+		return -ENOMEM;
 
 	cpus_read_lock();
 	etmdrvdata[drvdata->cpu] = drvdata;
@@ -1144,7 +1147,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.pdata = pdata;
 	desc.dev = dev;
 	desc.groups = coresight_etmv4_groups;
-	desc.name = dev_name(dev);
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
 		ret = PTR_ERR(drvdata->csdev);
diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index 75fa2d3..5867fcb 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -29,6 +29,8 @@
 #define FUNNEL_HOLDTIME		(0x7 << FUNNEL_HOLDTIME_SHFT)
 #define FUNNEL_ENSx_MASK	0xff
 
+DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
+
 /**
  * struct funnel_drvdata - specifics associated to a funnel component
  * @base:	memory mapped base address for this component.
@@ -192,6 +194,10 @@ static int funnel_probe(struct device *dev, struct resource *res)
 	    of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
 		pr_warn_once("Uses OBSOLETE CoreSight funnel binding\n");
 
+	desc.name = coresight_alloc_device_name(&funnel_devs, dev);
+	if (!desc.name)
+		return -ENOMEM;
+
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -231,7 +237,6 @@ static int funnel_probe(struct device *dev, struct resource *res)
 	desc.ops = &funnel_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
-	desc.name = dev_name(dev);
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
 		ret = PTR_ERR(drvdata->csdev);
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index 64dfde7..c0e4225 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -22,6 +22,8 @@
 #define REPLICATOR_IDFILTER0		0x000
 #define REPLICATOR_IDFILTER1		0x004
 
+DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
+
 /**
  * struct replicator_drvdata - specifics associated to a replicator component
  * @base:	memory mapped base address for this component. Also indicates
@@ -183,6 +185,10 @@ static int replicator_probe(struct device *dev, struct resource *res)
 	    of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
 		pr_warn_once("Uses OBSOLETE CoreSight replicator binding\n");
 
+	desc.name = coresight_alloc_device_name(&replicator_devs, dev);
+	if (!desc.name)
+		return -ENOMEM;
+
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -222,7 +228,6 @@ static int replicator_probe(struct device *dev, struct resource *res)
 	desc.ops = &replicator_cs_ops;
 	desc.pdata = dev->platform_data;
 	desc.dev = dev;
-	desc.name = dev_name(dev);
 
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 03528f3..e3e2b00 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -107,6 +107,8 @@ struct channel_space {
 	unsigned long		*guaranteed;
 };
 
+DEFINE_CORESIGHT_DEVLIST(stm_devs, "stm");
+
 /**
  * struct stm_drvdata - specifics associated to an STM component
  * @base:		memory mapped base address for this component.
@@ -810,6 +812,10 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	size_t bitmap_size;
 	struct coresight_desc desc = { 0 };
 
+	desc.name = coresight_alloc_device_name(&stm_devs, dev);
+	if (!desc.name)
+		return -ENOMEM;
+
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -854,11 +860,12 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	spin_lock_init(&drvdata->spinlock);
 
 	stm_init_default_data(drvdata);
-	stm_init_generic_data(drvdata, dev_name(dev));
+	stm_init_generic_data(drvdata, desc.name);
 
 	if (stm_register_device(dev, &drvdata->stm, THIS_MODULE)) {
 		dev_info(dev,
-			 "stm_register_device failed, probing deferred\n");
+			 "%s : stm_register_device failed, probing deferred\n",
+			 desc.name);
 		return -EPROBE_DEFER;
 	}
 
@@ -874,7 +881,6 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.ops = &stm_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
-	desc.name = dev_name(dev);
 	desc.groups = coresight_stm_groups;
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 212630e..be37aff 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -27,6 +27,10 @@
 #include "coresight-priv.h"
 #include "coresight-tmc.h"
 
+DEFINE_CORESIGHT_DEVLIST(etb_devs, "tmc_etb");
+DEFINE_CORESIGHT_DEVLIST(etf_devs, "tmc_etf");
+DEFINE_CORESIGHT_DEVLIST(etr_devs, "tmc_etr");
+
 void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
 {
 	/* Ensure formatter, unformatter and hardware fifo are empty */
@@ -397,6 +401,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 	struct tmc_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
+	struct coresight_dev_list *dev_list = NULL;
 
 	ret = -ENOMEM;
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
@@ -429,13 +434,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 
 	desc.dev = dev;
 	desc.groups = coresight_tmc_groups;
-	desc.name = dev_name(dev);
 
 	switch (drvdata->config_type) {
 	case TMC_CONFIG_TYPE_ETB:
 		desc.type = CORESIGHT_DEV_TYPE_SINK;
 		desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 		desc.ops = &tmc_etb_cs_ops;
+		dev_list = &etb_devs;
 		break;
 	case TMC_CONFIG_TYPE_ETR:
 		desc.type = CORESIGHT_DEV_TYPE_SINK;
@@ -447,11 +452,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 			goto out;
 		idr_init(&drvdata->idr);
 		mutex_init(&drvdata->idr_mutex);
+		dev_list = &etr_devs;
 		break;
 	case TMC_CONFIG_TYPE_ETF:
 		desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
 		desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
 		desc.ops = &tmc_etf_cs_ops;
+		dev_list = &etf_devs;
 		break;
 	default:
 		pr_err("%s: Unsupported TMC config\n", desc.name);
@@ -459,6 +466,12 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 		goto out;
 	}
 
+	desc.name = coresight_alloc_device_name(dev_list, dev);
+	if (!desc.name) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
 	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata)) {
 		ret = PTR_ERR(pdata);
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index b699d61..f8583e4 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -47,6 +47,8 @@
 #define FFCR_FON_MAN		BIT(6)
 #define FFCR_STOP_FI		BIT(12)
 
+DEFINE_CORESIGHT_DEVLIST(tpiu_devs, "tpiu");
+
 /**
  * @base:	memory mapped base address for this component.
  * @atclk:	optional clock for the core parts of the TPIU.
@@ -125,6 +127,10 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
 
+	desc.name = coresight_alloc_device_name(&tpiu_devs, dev);
+	if (!desc.name)
+		return -ENOMEM;
+
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -157,7 +163,6 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	desc.ops = &tpiu_cs_ops;
 	desc.pdata = pdata;
 	desc.dev = dev;
-	desc.name = dev_name(dev);
 	drvdata->csdev = coresight_register(&desc);
 
 	if (!IS_ERR(drvdata->csdev)) {
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 1287778..86d1fc2 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1291,3 +1291,61 @@ void coresight_unregister(struct coresight_device *csdev)
 	device_unregister(&csdev->dev);
 }
 EXPORT_SYMBOL_GPL(coresight_unregister);
+
+
+/*
+ * coresight_search_device_idx - Search the fwnode handle of a device
+ * in the given dev_idx list. Must be called with the coresight_mutex held.
+ *
+ * Returns the index of the entry, when found. Otherwise, -ENOENT.
+ */
+static inline int coresight_search_device_idx(struct coresight_dev_list *dict,
+					      struct fwnode_handle *fwnode)
+{
+	int i;
+
+	for (i = 0; i < dict->nr_idx; i++)
+		if (dict->fwnode_list[i] == fwnode)
+			return i;
+	return -ENOENT;
+}
+
+/*
+ * coresight_alloc_device_name - Get an index for a given device in the
+ * device index list specific to a driver. An index is allocated for a
+ * device and is tracked with the fwnode_handle to prevent allocating
+ * duplicate indices for the same device (e.g, if we defer probing of
+ * a device due to dependencies), in case the index is requested again.
+ */
+char *coresight_alloc_device_name(struct coresight_dev_list *dict,
+				  struct device *dev)
+{
+	int idx;
+	char *name = NULL;
+	struct fwnode_handle **list;
+
+	mutex_lock(&coresight_mutex);
+
+	idx = coresight_search_device_idx(dict, dev_fwnode(dev));
+	if (idx < 0) {
+		/* Make space for the new entry */
+		idx = dict->nr_idx;
+		list = krealloc(dict->fwnode_list,
+				(idx + 1) * sizeof(*dict->fwnode_list),
+				GFP_KERNEL);
+		if (ZERO_OR_NULL_PTR(list)) {
+			idx = -ENOMEM;
+			goto done;
+		}
+
+		list[idx] = dev_fwnode(dev);
+		dict->fwnode_list = list;
+		dict->nr_idx = idx + 1;
+	}
+
+	name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
+done:
+	mutex_unlock(&coresight_mutex);
+	return name;
+}
+EXPORT_SYMBOL_GPL(coresight_alloc_device_name);
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index b40544b..a2b6882 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -168,6 +168,28 @@ struct coresight_device {
 	struct dev_ext_attribute *ea;
 };
 
+/*
+ * coresight_dev_list - Mapping for devices to "name" index for device
+ * names.
+ *
+ * @nr_idx:		Number of entries already allocated.
+ * @pfx:		Prefix pattern for device name.
+ * @fwnode_list:	Array of fwnode_handles associated with each allocated
+ *			index, upto nr_idx entries.
+ */
+struct coresight_dev_list {
+	int			nr_idx;
+	const char		*pfx;
+	struct fwnode_handle	**fwnode_list;
+};
+
+#define DEFINE_CORESIGHT_DEVLIST(var, dev_pfx)				\
+static struct coresight_dev_list (var) = {				\
+						.pfx = dev_pfx,		\
+						.nr_idx = 0,		\
+						.fwnode_list = NULL,	\
+}
+
 #define to_coresight_device(d) container_of(d, struct coresight_device, dev)
 
 #define source_ops(csdev)	csdev->ops->source_ops
@@ -261,7 +283,8 @@ extern int coresight_claim_device_unlocked(void __iomem *base);
 
 extern void coresight_disclaim_device(void __iomem *base);
 extern void coresight_disclaim_device_unlocked(void __iomem *base);
-
+extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
+					 struct device *dev);
 #else
 static inline struct coresight_device *
 coresight_register(struct coresight_desc *desc) { return NULL; }
-- 
2.7.4


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[PATCH v4 27/30] coresight: stm: ACPI support for parsing stimulus base

[Suzuki K Poulose]

The stimulus base for STM device must be listed as the second memory
resource, followed by the programming base address as described in
"Section 2.3 Resources" in ACPI for CoreSightTM 1.0 Platform Design
documen (DEN0067).

Add support for parsing the information for ACPI.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-stm.c | 53 ++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index e3e2b00..b908ca1 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -16,6 +16,7 @@
  * (C) 2015-2016 Chunyan Zhang <zhang.chunyan@linaro.org>
  */
 #include <asm/local.h>
+#include <linux/acpi.h>
 #include <linux/amba/bus.h>
 #include <linux/bitmap.h>
 #include <linux/clk.h>
@@ -716,10 +717,60 @@ static inline int of_stm_get_stimulus_area(struct device *dev,
 }
 #endif
 
+#ifdef CONFIG_ACPI
+static int acpi_stm_get_stimulus_area(struct device *dev, struct resource *res)
+{
+	int rc;
+	bool found_base = false;
+	struct resource_entry *rent;
+	LIST_HEAD(res_list);
+
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	if (!adev)
+		return -ENODEV;
+	rc = acpi_dev_get_resources(adev, &res_list, NULL, NULL);
+	if (rc < 0)
+		return rc;
+
+	/*
+	 * The stimulus base for STM device must be listed as the second memory
+	 * resource, followed by the programming base address as described in
+	 * "Section 2.3 Resources" in ACPI for CoreSightTM 1.0 Platform Design
+	 * document (DEN0067).
+	 */
+	rc = -ENOENT;
+	list_for_each_entry(rent, &res_list, node) {
+		if (resource_type(rent->res) != IORESOURCE_MEM)
+			continue;
+		if (found_base) {
+			*res = *rent->res;
+			rc = 0;
+			break;
+		}
+
+		found_base = true;
+	}
+
+	acpi_dev_free_resource_list(&res_list);
+	return rc;
+}
+#else
+static inline int acpi_stm_get_stimulus_area(struct device *dev,
+					     struct resource *res)
+{
+	return -ENOENT;
+}
+#endif
+
 static int stm_get_stimulus_area(struct device *dev, struct resource *res)
 {
-	if (is_of_node(dev_fwnode(dev)))
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+
+	if (is_of_node(fwnode))
 		return of_stm_get_stimulus_area(dev, res);
+	else if (is_acpi_node(fwnode))
+		return acpi_stm_get_stimulus_area(dev, res);
 	return -ENOENT;
 }
 
-- 
2.7.4


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[PATCH v4 28/30] coresight: Support for ACPI bindings

[Suzuki K Poulose]

Add support for parsing the ACPI platform description
for CoreSight. The connections are encoded in a DSD graph
property with CoreSight specific variation of the property.

The ETMs are listed as the children device of the respective
CPU.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-platform.c | 464 +++++++++++++++++++++++
 1 file changed, 464 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 49112a5..6fef873 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2012, The Linux Foundation. All rights reserved.
  */
 
+#include <linux/acpi.h>
 #include <linux/types.h>
 #include <linux/err.h>
 #include <linux/slab.h>
@@ -308,10 +309,471 @@ of_get_coresight_platform_data(struct device *dev,
 }
 #endif
 
+#ifdef CONFIG_ACPI
+
+#include <acpi/actypes.h>
+#include <acpi/processor.h>
+
+/* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
+static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
+						0xbd, 0x68, 0xf7, 0xd3,
+						0x44, 0xef, 0x21, 0x53);
+/* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
+static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
+						     0x81, 0x07, 0xe6, 0x27,
+						     0xf8, 0x05, 0xc6, 0xcd);
+#define ACPI_CORESIGHT_LINK_SLAVE	0
+#define ACPI_CORESIGHT_LINK_MASTER	1
+
+static inline bool is_acpi_guid(const union acpi_object *obj)
+{
+	return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
+}
+
+/*
+ * acpi_guid_matches	- Checks if the given object is a GUID object and
+ * that it matches the supplied the GUID.
+ */
+static inline bool acpi_guid_matches(const union acpi_object *obj,
+				   const guid_t *guid)
+{
+	return is_acpi_guid(obj) &&
+	       guid_equal((guid_t *)obj->buffer.pointer, guid);
+}
+
+static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
+{
+	return acpi_guid_matches(obj, &acpi_graph_uuid);
+}
+
+static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
+{
+	return acpi_guid_matches(obj, &coresight_graph_uuid);
+}
+
+static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
+{
+	const union acpi_object *graphid, *guid, *links;
+
+	if (obj->type != ACPI_TYPE_PACKAGE ||
+	    obj->package.count < 3)
+		return false;
+
+	graphid = &obj->package.elements[0];
+	guid = &obj->package.elements[1];
+	links = &obj->package.elements[2];
+
+	if (graphid->type != ACPI_TYPE_INTEGER ||
+	    links->type != ACPI_TYPE_INTEGER)
+		return false;
+
+	return is_acpi_coresight_graph_guid(guid);
+}
+
+/*
+ * acpi_validate_dsd_graph	- Make sure the given _DSD graph conforms
+ * to the ACPI _DSD Graph specification.
+ *
+ * ACPI Devices Graph property has the following format:
+ *  {
+ *	Revision	- Integer, must be 0
+ *	NumberOfGraphs	- Integer, N indicating the following list.
+ *	Graph[1],
+ *	 ...
+ *	Graph[N]
+ *  }
+ *
+ * And each Graph entry has the following format:
+ *  {
+ *	GraphID		- Integer, identifying a graph the device belongs to.
+ *	UUID		- UUID identifying the specification that governs
+ *			  this graph. (e.g, see is_acpi_coresight_graph())
+ *	NumberOfLinks	- Number "N" of connections on this node of the graph.
+ *	Links[1]
+ *	...
+ *	Links[N]
+ *  }
+ *
+ * Where each "Links" entry has the following format:
+ *
+ * {
+ *	SourcePortAddress	- Integer
+ *	DestinationPortAddress	- Integer
+ *	DestinationDeviceName	- Reference to another device
+ *	( --- CoreSight specific extensions below ---)
+ *	DirectionOfFlow		- Integer 1 for output(master)
+ *				  0 for input(slave)
+ * }
+ *
+ * e.g:
+ * For a Funnel device
+ *
+ * Device(MFUN) {
+ *   ...
+ *
+ *   Name (_DSD, Package() {
+ *	// DSD Package contains tuples of {  Proeprty_Type_UUID, Package() }
+ *	ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
+ *	Package() {
+ *		Package(2) { "property-name", <property-value> }
+ *	},
+ *
+ *	ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
+ *	Package() {
+ *	  0,		// Revision
+ *	  1,		// NumberOfGraphs.
+ *	  Package() {	// Graph[0] Package
+ *	     1,		// GraphID
+ *	     // Coresight Graph UUID
+ *	     ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
+ *	     3,		// NumberOfLinks aka ports
+ *	     // Link[0]: Output_0 -> Replicator:Input_0
+ *	     Package () { 0, 0, \_SB_.RPL0, 1 },
+ *	     // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
+ *	     Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
+ *	     // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
+ *	      Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
+ *	  }	// End of Graph[0] Package
+ *
+ *	}, // End of ACPI Graph Property
+ *  })
+ */
+static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
+{
+	int i, n;
+	const union acpi_object *rev, *nr_graphs;
+
+	/* The graph must contain at least the Revision and Number of Graphs */
+	if (graph->package.count < 2)
+		return false;
+
+	rev = &graph->package.elements[0];
+	nr_graphs = &graph->package.elements[1];
+
+	if (rev->type != ACPI_TYPE_INTEGER ||
+	    nr_graphs->type != ACPI_TYPE_INTEGER)
+		return false;
+
+	/* We only support revision 0 */
+	if (rev->integer.value != 0)
+		return false;
+
+	n = nr_graphs->integer.value;
+	/* CoreSight devices are only part of a single Graph */
+	if (n != 1)
+		return false;
+
+	/* Make sure the ACPI graph package has right number of elements */
+	if (graph->package.count != (n + 2))
+		return false;
+
+	/*
+	 * Each entry must be a graph package with at least 3 members :
+	 * { GraphID, UUID, NumberOfLinks(n), Links[.],... }
+	 */
+	for (i = 2; i < n + 2; i++) {
+		const union acpi_object *obj = &graph->package.elements[i];
+
+		if (obj->type != ACPI_TYPE_PACKAGE ||
+		    obj->package.count < 3)
+			return false;
+	}
+
+	return true;
+}
+
+/* acpi_get_dsd_graph	- Find the _DSD Graph property for the given device. */
+const union acpi_object *
+acpi_get_dsd_graph(struct acpi_device *adev)
+{
+	int i;
+	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+	acpi_status status;
+	const union acpi_object *dsd;
+
+	status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
+					    &buf, ACPI_TYPE_PACKAGE);
+	if (ACPI_FAILURE(status))
+		return NULL;
+
+	dsd = buf.pointer;
+
+	/*
+	 * _DSD property consists tuples { Prop_UUID, Package() }
+	 * Iterate through all the packages and find the Graph.
+	 */
+	for (i = 0; i + 1 < dsd->package.count; i += 2) {
+		const union acpi_object *guid, *package;
+
+		guid = &dsd->package.elements[i];
+		package = &dsd->package.elements[i + 1];
+
+		/* All _DSD elements must have a UUID and a Package */
+		if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
+			break;
+		/* Skip the non-Graph _DSD packages */
+		if (!is_acpi_dsd_graph_guid(guid))
+			continue;
+		if (acpi_validate_dsd_graph(package))
+			return package;
+		/* Invalid graph format, continue */
+		dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
+	}
+
+	return NULL;
+}
+
+static inline bool
+acpi_validate_coresight_graph(const union acpi_object *cs_graph)
+{
+	int nlinks;
+
+	nlinks = cs_graph->package.elements[2].integer.value;
+	/*
+	 * Graph must have the following fields :
+	 * { GraphID, GraphUUID, NumberOfLinks, Links... }
+	 */
+	if (cs_graph->package.count != (nlinks + 3))
+		return false;
+	/* The links are validated in acpi_coresight_parse_link() */
+	return true;
+}
+
+/*
+ * acpi_get_coresight_graph	- Parse the device _DSD tables and find
+ * the Graph property matching the CoreSight Graphs.
+ *
+ * Returns the pointer to the CoreSight Graph Package when found. Otherwise
+ * returns NULL.
+ */
+const union acpi_object *
+acpi_get_coresight_graph(struct acpi_device *adev)
+{
+	const union acpi_object *graph_list, *graph;
+	int i, nr_graphs;
+
+	graph_list = acpi_get_dsd_graph(adev);
+	if (!graph_list)
+		return graph_list;
+
+	nr_graphs = graph_list->package.elements[1].integer.value;
+
+	for (i = 2; i < nr_graphs + 2; i++) {
+		graph = &graph_list->package.elements[i];
+		if (!is_acpi_coresight_graph(graph))
+			continue;
+		if (acpi_validate_coresight_graph(graph))
+			return graph;
+		/* Invalid graph format */
+		break;
+	}
+
+	return NULL;
+}
+
+/*
+ * acpi_coresight_parse_link	- Parse the given Graph connection
+ * of the device and populate the coresight_connection for an output
+ * connection.
+ *
+ * CoreSight Graph specification mandates that the direction of the data
+ * flow must be specified in the link. i.e,
+ *
+ *	SourcePortAddress,	// Integer
+ *	DestinationPortAddress,	// Integer
+ *	DestinationDeviceName,	// Reference to another device
+ *	DirectionOfFlow,	// 1 for output(master), 0 for input(slave)
+ *
+ * Returns the direction of the data flow [ Input(slave) or Output(master) ]
+ * upon success.
+ * Returns an negative error number otherwise.
+ */
+static int acpi_coresight_parse_link(struct acpi_device *adev,
+				     const union acpi_object *link,
+				     struct coresight_connection *conn)
+{
+	int rc, dir;
+	const union acpi_object *fields;
+	struct acpi_device *r_adev;
+	struct device *rdev;
+
+	if (link->type != ACPI_TYPE_PACKAGE ||
+	    link->package.count != 4)
+		return -EINVAL;
+
+	fields = link->package.elements;
+
+	if (fields[0].type != ACPI_TYPE_INTEGER ||
+	    fields[1].type != ACPI_TYPE_INTEGER ||
+	    fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
+	    fields[3].type != ACPI_TYPE_INTEGER)
+		return -EINVAL;
+
+	rc = acpi_bus_get_device(fields[2].reference.handle, &r_adev);
+	if (rc)
+		return rc;
+
+	dir = fields[3].integer.value;
+	if (dir == ACPI_CORESIGHT_LINK_MASTER) {
+		conn->outport = fields[0].integer.value;
+		conn->child_port = fields[1].integer.value;
+		rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
+		if (!rdev)
+			return -EPROBE_DEFER;
+		/*
+		 * Hold the refcount to the target device. This could be
+		 * released via:
+		 * 1) coresight_release_platform_data() if the probe fails or
+		 *    this device is unregistered.
+		 * 2) While removing the target device via
+		 *    coresight_remove_match().
+		 */
+		conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode);
+	}
+
+	return dir;
+}
+
+/*
+ * acpi_coresight_parse_graph	- Parse the _DSD CoreSight graph
+ * connection information and populate the supplied coresight_platform_data
+ * instance.
+ */
+static int acpi_coresight_parse_graph(struct acpi_device *adev,
+				      struct coresight_platform_data *pdata)
+{
+	int rc, i, nlinks;
+	const union acpi_object *graph;
+	struct coresight_connection *conns, *ptr;
+
+	pdata->nr_inport = pdata->nr_outport = 0;
+	graph = acpi_get_coresight_graph(adev);
+	if (!graph)
+		return -ENOENT;
+
+	nlinks = graph->package.elements[2].integer.value;
+	if (!nlinks)
+		return 0;
+
+	/*
+	 * To avoid scanning the table twice (once for finding the number of
+	 * output links and then later for parsing the output links),
+	 * cache the links information in one go and then later copy
+	 * it to the pdata.
+	 */
+	conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL);
+	if (!conns)
+		return -ENOMEM;
+	ptr = conns;
+	for (i = 0; i < nlinks; i++) {
+		const union acpi_object *link = &graph->package.elements[3 + i];
+		int dir;
+
+		dir = acpi_coresight_parse_link(adev, link, ptr);
+		if (dir < 0)
+			return dir;
+
+		if (dir == ACPI_CORESIGHT_LINK_MASTER) {
+			pdata->nr_outport++;
+			ptr++;
+		} else {
+			pdata->nr_inport++;
+		}
+	}
+
+	rc = coresight_alloc_conns(&adev->dev, pdata);
+	if (rc)
+		return rc;
+
+	/* Copy the connection information to the final location */
+	for (i = 0; i < pdata->nr_outport; i++)
+		pdata->conns[i] = conns[i];
+
+	devm_kfree(&adev->dev, conns);
+	return 0;
+}
+
+/*
+ * acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
+ * logical CPU id of the corresponding CPU device.
+ *
+ * Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
+ */
+static int
+acpi_handle_to_logical_cpuid(acpi_handle handle)
+{
+	int i;
+	struct acpi_processor *pr;
+
+	for_each_possible_cpu(i) {
+		pr = per_cpu(processors, i);
+		if (pr && pr->handle == handle)
+			break;
+	}
+
+	return i;
+}
+
+/*
+ * acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
+ * with this coresight device. With ACPI bindings, the CoreSight components
+ * are listed as child device of the associated CPU.
+ *
+ * Returns the logical CPU id when found. Otherwise returns 0.
+ */
+static int acpi_coresight_get_cpu(struct device *dev)
+{
+	int cpu;
+	acpi_handle cpu_handle;
+	acpi_status status;
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	if (!adev)
+		return 0;
+	status = acpi_get_parent(adev->handle, &cpu_handle);
+	if (ACPI_FAILURE(status))
+		return 0;
+
+	cpu = acpi_handle_to_logical_cpuid(cpu_handle);
+	if (cpu >= nr_cpu_ids)
+		return 0;
+	return cpu;
+}
+
+static int
+acpi_get_coresight_platform_data(struct device *dev,
+				 struct coresight_platform_data *pdata)
+{
+	struct acpi_device *adev;
+
+	adev = ACPI_COMPANION(dev);
+	if (!adev)
+		return -EINVAL;
+
+	return acpi_coresight_parse_graph(adev, pdata);
+}
+
+#else
+
+static inline int
+acpi_get_coresight_platform_data(struct device *dev,
+				 struct coresight_platform_data *pdata)
+{
+	return -ENOENT;
+}
+
+static inline int acpi_coresight_get_cpu(struct device *dev)
+{
+	return 0;
+}
+#endif
+
 int coresight_get_cpu(struct device *dev)
 {
 	if (is_of_node(dev->fwnode))
 		return of_coresight_get_cpu(dev);
+	else if (is_acpi_device_node(dev->fwnode))
+		return acpi_coresight_get_cpu(dev);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(coresight_get_cpu);
@@ -334,6 +796,8 @@ coresight_get_platform_data(struct device *dev)
 
 	if (is_of_node(fwnode))
 		ret = of_get_coresight_platform_data(dev, pdata);
+	else if (is_acpi_device_node(fwnode))
+		ret = acpi_get_coresight_platform_data(dev, pdata);
 
 	if (!ret)
 		return pdata;
-- 
2.7.4


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[PATCH v4 29/30] coresight: acpi: Support for AMBA components

[Suzuki K Poulose]

All AMBA devices are handled via ACPI AMBA scan notifier
infrastructure. The platform devices get the ACPI id
added to their driver.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/acpi/acpi_amba.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
index 7f77c07..e2142e3 100644
--- a/drivers/acpi/acpi_amba.c
+++ b/drivers/acpi/acpi_amba.c
@@ -24,6 +24,15 @@
 
 static const struct acpi_device_id amba_id_list[] = {
 	{"ARMH0061", 0}, /* PL061 GPIO Device */
+	{"ARMHC500", 0}, /* ARM CoreSight ETM4x */
+	{"ARMHC501", 0}, /* ARM CoreSight ETR */
+	{"ARMHC502", 0}, /* ARM CoreSight STM */
+	{"ARMHC503", 0}, /* ARM CoreSight Debug */
+	{"ARMHC979", 0}, /* ARM CoreSight TPIU */
+	{"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */
+	{"ARMHC98D", 0}, /* ARM CoreSight Dynamic Replicator */
+	{"ARMHC9CA", 0}, /* ARM CoreSight CATU */
+	{"ARMHC9FF", 0}, /* ARM CoreSight Dynamic Funnel */
 	{"", 0},
 };
 
-- 
2.7.4


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[PATCH v4 30/30] coresight: acpi: Support for platform devices

[Suzuki K Poulose]

Add support for platform devices which do not appear on the AMBA
bus.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-replicator.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index c0e4225..5429527 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -5,6 +5,7 @@
  * Description: CoreSight Replicator driver
  */
 
+#include <linux/acpi.h>
 #include <linux/amba/bus.h>
 #include <linux/kernel.h>
 #include <linux/device.h>
@@ -296,11 +297,18 @@ static const struct of_device_id static_replicator_match[] = {
 	{}
 };
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id static_replicator_acpi_ids[] = {
+	{"ARMHC985", 0}, /* ARM CoreSight Static Replicator */
+};
+#endif
+
 static struct platform_driver static_replicator_driver = {
 	.probe          = static_replicator_probe,
 	.driver         = {
 		.name   = "coresight-static-replicator",
-		.of_match_table = static_replicator_match,
+		.of_match_table = of_match_ptr(static_replicator_match),
+		.acpi_match_table = ACPI_PTR(static_replicator_acpi_ids),
 		.pm	= &replicator_dev_pm_ops,
 		.suppress_bind_attrs = true,
 	},
-- 
2.7.4


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[TEST PATCH 31/30][EDK2] edk2-platform: juno: Update ACPI CoreSight Bindings

[Suzuki K Poulose]

ACPI bindings for CoreSight components on the Juno-r0 board.
Please note that the bindings apply only for the juno-r0.
The layout on r1 and r2 are slightly different and will need
dynamic ACPI table support to be able to use a single UEFI
image.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 Platform/ARM/JunoPkg/AcpiTables/Dsdt.asl | 241 +++++++++++++++++++++++++++++++
 1 file changed, 241 insertions(+)

diff --git a/Platform/ARM/JunoPkg/AcpiTables/Dsdt.asl b/Platform/ARM/JunoPkg/AcpiTables/Dsdt.asl
index 702b057..c70e8ac 100644
--- a/Platform/ARM/JunoPkg/AcpiTables/Dsdt.asl
+++ b/Platform/ARM/JunoPkg/AcpiTables/Dsdt.asl
@@ -14,6 +14,51 @@
 
 #include "ArmPlatform.h"
 
+#define ACPI_GRAPH_REV		0
+#define ACPI_GRAPH_UUID		"ab02a46b-74c7-45a2-bd68-f7d344ef2153"
+
+#define CORESIGHT_GRAPH_UUID	"3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"
+
+#define CS_LINK_MASTER		1
+#define CS_LINK_SLAVE		0
+
+
+#define DSD_CS_GRAPH_BEGIN(_nports)			\
+        Package () {					\
+          1,		// GraphID			\
+          ToUUID(CORESIGHT_GRAPH_UUID),			\
+          _nports,
+
+#define DSD_CS_GRAPH_END				\
+	}
+
+#define DSD_GRAPH_BEGIN(_nports)			\
+     ToUUID(ACPI_GRAPH_UUID),				\
+     Package() {					\
+       ACPI_GRAPH_REV,					\
+       1,						\
+       DSD_CS_GRAPH_BEGIN(_nports)
+
+#define DSD_GRAPH_END					\
+       DSD_CS_GRAPH_END					\
+     }
+
+#define DSD_PORTS_BEGIN(_nports)			\
+   Name (_DSD,  Package () {				\
+     DSD_GRAPH_BEGIN(_nports)
+
+#define DSD_PORTS_END					\
+   DSD_GRAPH_END					\
+  })
+
+#define CS_PORT(_port, _rport, _rphandle, _dir)		\
+    Package () { _port, _rport, _rphandle, _dir}
+
+#define CS_INPUT_PORT(_port, _rport, _rphandle)		\
+    CS_PORT(_port, _rport, _rphandle, CS_LINK_SLAVE)
+#define CS_OUTPUT_PORT(_port, _rport, _rphandle)		\
+    CS_PORT(_port, _rport, _rphandle, CS_LINK_MASTER)
+
 DefinitionBlock("DsdtTable.aml", "DSDT", 1, "ARMLTD", "ARM-JUNO", EFI_ACPI_ARM_OEM_REVISION) {
   Scope(_SB) {
     //
@@ -122,15 +167,56 @@ DefinitionBlock("DsdtTable.aml", "DSDT", 1, "ARMLTD", "ARM-JUNO", EFI_ACPI_ARM_O
         Method (_LPI, 0, NotSerialized) {
           return(PLPI)
         }
+
+        Device(ETM0) { // ETM on Cluster0 CPU0
+          Name (_HID, "ARMHC500")
+          Name (_CID, "ARMHC500")
+          Name (_CRS, ResourceTemplate() {
+            Memory32Fixed(ReadWrite, 0x22040000, 0x1000)
+          })
+
+          DSD_PORTS_BEGIN(1)
+          CS_OUTPUT_PORT(0, 0, \_SB_.CLU0.FUN0)
+          DSD_PORTS_END
+
+        } // ETM0
       }
+
       Device(CPU1) { // A57-1: Cluster 0, Cpu 1
         Name(_HID, "ACPI0007")
         Name(_UID, 5)
         Method (_LPI, 0, NotSerialized) {
           return(PLPI)
         }
+        Device(ETM1) { // ETM on Cluster0 CPU1
+          Name (_HID, "ARMHC500")
+          Name (_CID, "ARMHC500")
+          Name (_CRS, ResourceTemplate() {
+            Memory32Fixed(ReadWrite, 0x22140000, 0x1000)
+          })
+
+          DSD_PORTS_BEGIN(1)
+          CS_OUTPUT_PORT(0, 1, \_SB_.CLU0.FUN0)
+          DSD_PORTS_END
+
+        } // ETM1
       }
+
+      Device(FUN0) {
+        Name(_HID, "ARMHC9FF")
+        Name(_CID, "ARMHC9FF")
+        Name(_CRS, ResourceTemplate() {
+          Memory32Fixed(ReadWrite, 0x220c0000, 0x1000)
+        })
+
+        DSD_PORTS_BEGIN(3)
+        CS_OUTPUT_PORT(0, 0, \_SB_.MFUN),
+        CS_INPUT_PORT(0, 0, \_SB_.CLU0.CPU0.ETM0),
+        CS_INPUT_PORT(1, 0, \_SB_.CLU0.CPU1.ETM1)
+        DSD_PORTS_END
+      } // CL0.FUN0
     }
+
     Device (CLU1) { // Cluster1 state
       Name(_HID, "ACPI0010")
       Name(_UID, 2)
@@ -208,19 +294,45 @@ DefinitionBlock("DsdtTable.aml", "DSDT", 1, "ARMLTD", "ARM-JUNO", EFI_ACPI_ARM_O
           "CorePwrDn"
         },
       })
+
       Device(CPU2) { // A53-0: Cluster 1, Cpu 0
         Name(_HID, "ACPI0007")
         Name(_UID, 0)
         Method (_LPI, 0, NotSerialized) {
           return(PLPI)
         }
+        Device(ETM2) { // ETM on Cluster1, CPU0
+          Name (_HID, "ARMHC500")
+          Name (_CID, "ARMHC500")
+          Name (_CRS, ResourceTemplate() {
+            Memory32Fixed(ReadWrite, 0x23040000, 0x1000)
+          })
+
+          DSD_PORTS_BEGIN(1)
+          CS_OUTPUT_PORT(0, 0, \_SB_.CLU1.FUN1)
+          DSD_PORTS_END
+
+        } // ETM2
       }
+
       Device(CPU3) { // A53-1: Cluster 1, Cpu 1
         Name(_HID, "ACPI0007")
         Name(_UID, 1)
         Method (_LPI, 0, NotSerialized) {
           return(PLPI)
         }
+        Device(ETM3) { // ETM on Cluster1, CPU1
+          Name (_HID, "ARMHC500")
+          Name (_CID, "ARMHC500")
+          Name (_CRS, ResourceTemplate() {
+            Memory32Fixed(ReadWrite, 0x23140000, 0x1000)
+          })
+
+          DSD_PORTS_BEGIN(1)
+          CS_OUTPUT_PORT(0, 1, \_SB_.CLU1.FUN1)
+          DSD_PORTS_END
+
+        } // ETM3
       }
       Device(CPU4) { // A53-2: Cluster 1, Cpu 2
         Name(_HID, "ACPI0007")
@@ -228,6 +340,18 @@ DefinitionBlock("DsdtTable.aml", "DSDT", 1, "ARMLTD", "ARM-JUNO", EFI_ACPI_ARM_O
         Method (_LPI, 0, NotSerialized) {
           return(PLPI)
         }
+        Device(ETM4) { // ETM on Cluster1, CPU2
+          Name (_HID, "ARMHC500")	// ETM
+          Name (_CID, "ARMHC500")	// ETM
+          Name (_CRS, ResourceTemplate() {
+            Memory32Fixed(ReadWrite, 0x23240000, 0x1000)
+          })
+
+          DSD_PORTS_BEGIN(1)
+          CS_OUTPUT_PORT(0, 2, \_SB_.CLU1.FUN1)
+          DSD_PORTS_END
+
+        } // ETM4
       }
       Device(CPU5) { // A53-3: Cluster 1, Cpu 3
         Name(_HID, "ACPI0007")
@@ -235,9 +359,126 @@ DefinitionBlock("DsdtTable.aml", "DSDT", 1, "ARMLTD", "ARM-JUNO", EFI_ACPI_ARM_O
         Method (_LPI, 0, NotSerialized) {
           return(PLPI)
         }
+        Device(ETM5) { // ETM on Cluster1, CPU3
+          Name (_HID, "ARMHC500")	// ETM
+          Name (_CID, "ARMHC500")	// ETM
+          Name (_CRS, ResourceTemplate() {
+            Memory32Fixed(ReadWrite, 0x23340000, 0x1000)
+          })
+
+          DSD_PORTS_BEGIN(1)
+          CS_OUTPUT_PORT(0, 3, \_SB_.CLU1.FUN1)
+          DSD_PORTS_END
+        } // ETM5
       }
+      Device(FUN1) {
+        Name(_HID, "ARMHC9FF")
+        Name(_CID, "ARMHC9FF")
+        Name(_CRS, ResourceTemplate() {
+          Memory32Fixed(ReadWrite, 0x230c0000, 0x1000)
+        })
+
+        DSD_PORTS_BEGIN(5)
+        CS_OUTPUT_PORT(0, 1, \_SB_.MFUN),
+        CS_INPUT_PORT(0, 0, \_SB_.CLU1.CPU2.ETM2),
+        CS_INPUT_PORT(1, 0, \_SB_.CLU1.CPU3.ETM3),
+        CS_INPUT_PORT(2, 0, \_SB_.CLU1.CPU4.ETM4),
+        CS_INPUT_PORT(3, 0, \_SB_.CLU1.CPU5.ETM5)
+        DSD_PORTS_END
+      } // CL1.FUN1
     }
 
+    Device(STM0) {
+      Name(_HID, "ARMHC502")	// STM
+      Name(_CID, "ARMHC502")
+      Name(_CRS, ResourceTemplate() {
+        Memory32Fixed(ReadWrite, 0x20100000, 0x1000)
+        Memory32Fixed(ReadWrite, 0x28000000, 0x1000000)
+      })
+      DSD_PORTS_BEGIN(1)
+      CS_OUTPUT_PORT(0, 2, \_SB_.MFUN)
+      DSD_PORTS_END
+    }
+
+    Device(MFUN) {
+      Name(_HID, "ARMHC9FF")	// Funnel
+      Name(_CID, "ARMHC9FF")	// Funnel
+      Name(_CRS, ResourceTemplate() {
+        Memory32Fixed(ReadWrite, 0x20040000, 0x1000)
+      })
+
+      DSD_PORTS_BEGIN(4)
+      CS_OUTPUT_PORT(0, 0, \_SB_.ETF0),
+      CS_INPUT_PORT(0, 0, \_SB_.CLU0.FUN0),
+      CS_INPUT_PORT(1, 0, \_SB_.CLU1.FUN1),
+      CS_INPUT_PORT(2, 0, \_SB_.STM0)
+      DSD_PORTS_END
+
+    } // MFUN-nel
+
+    Device(ETF0) {
+      Name(_HID, "ARMHC97C")	// TMC
+      Name(_CID, "ARMHC97C")	// TMC
+      Name(_CRS, ResourceTemplate() {
+        Memory32Fixed(ReadWrite, 0x20010000, 0x1000)
+      })
+
+      DSD_PORTS_BEGIN(2)
+      CS_OUTPUT_PORT(0, 1, \_SB_.RPL),
+      CS_INPUT_PORT(0, 0, \_SB_.MFUN)
+      DSD_PORTS_END
+
+    } // ETF0
+
+    Device(RPL) {
+      Name(_HID, "ARMHC98D")	// Replicator
+      Name(_CID, "ARMHC98D")	// Replicator
+      Name(_CRS, ResourceTemplate() {
+        Memory32Fixed(ReadWrite, 0x20120000, 0x1000)
+      })
+
+      DSD_PORTS_BEGIN(3)
+      CS_OUTPUT_PORT(0, 0, \_SB_.TPIU),
+      CS_OUTPUT_PORT(1, 0, \_SB_.ETR),
+      CS_INPUT_PORT(0, 0, \_SB_.ETF0)
+      DSD_PORTS_END
+
+    } // RPL
+
+    Device(ETR) {
+      Name(_HID, "ARMHC97C")	// TMC
+      Name(_CID, "ARMHC97C")	// TMC
+      Name(_CCA, 0) // The ETR on this platform is not coherent
+      Name(_CRS, ResourceTemplate() {
+        Memory32Fixed(ReadWrite, 0x20070000, 0x1000)
+      })
+
+      Name(_DSD, Package() {
+         DSD_GRAPH_BEGIN(1)
+         CS_INPUT_PORT(0, 1, \_SB_.RPL)
+         DSD_GRAPH_END,
+
+         ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+         Package() {
+            Package(2) {"arm,scatter-gather", 1}
+         }
+      })
+
+    } // ETR
+
+    Device(TPIU) {
+      Name(_HID, "ARMHC979")	// TPIU
+      Name(_CID, "ARMHC979")	// TPIU
+      Name(_CRS, ResourceTemplate() {
+        Memory32Fixed(ReadWrite, 0x20030000, 0x1000)
+      })
+
+      DSD_PORTS_BEGIN(1)
+      CS_INPUT_PORT(0, 0, \_SB_.RPL)
+      DSD_PORTS_END
+
+    } // TPIU
+
     //
     // Keyboard and Mouse
     //
-- 
2.7.4


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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Suzuki K Poulose]

On 22/05/2019 11:34, Suzuki K Poulose wrote:
> This series adds the support for CoreSight devices on ACPI based
> platforms. The device connections are encoded as _DSD graph property[0],
> with CoreSight specific extensions to indicate the direction of data
> flow as described in [1]. Components attached to CPUs are listed
> as child devices of the corresponding CPU, removing explicit links
> to the CPU like we do in the DT.
> 
> The majority of the series cleans up the driver and prepares the subsystem
> for platform agnostic firwmare probing, naming scheme, searching etc.
> 
> We introduce platform independent helpers to parse the platform supplied
> information. Thus we rename the platform handling code from:
> 	of_coresight.c  => coresight-platform.c
> 
> The CoreSight driver creates shadow devices that appear on the Coresight
> bus, in addition to the real devices (e.g, AMBA bus devices). The name
> of these devices match the real device. This makes the device name
> a bit cryptic for ACPI platform. So this series also introduces a generic
> platform agnostic device naming scheme for the shadow Coresight devices.
> Towards this we also make changes to the way we lookup devices to resolve
> the connections, as we can't use the names to identify the devices. So,
> we use the "fwnode_handle" of the real device for the device lookups.
> Towards that we clean up the drivers to keep track of the "CoreSight"
> device rather than the "real" device. However, all real operations,
> like DMA allocation, Power management etc. must be performed on
> the real device which is the parent of the shadow device.
> 
> Finally we add the support for parsing the ACPI platform data. The power
> management support is missing in the ACPI (and this is not specific to
> CoreSight). The firmware must ensure that the respective power domains
> are turned on.
> 
> Applies on v5.2-rc1
> 
> Tested on a Juno-r0 board with ACPI bindings patch (Patch 31/30) added on
> top of [2]. You would need to make sure that the debug power domain is
> turned on before the Linux kernel boots. (e.g, connect the DS-5 to the
> Juno board while at UEFI). arm32 code is only compile tested.
> 
> [0] ACPI Device Graphs using _DSD (Not available online yet, approved but
>      awaiting publish and eventually should be linked at).
>      https://uefi.org/sites/default/files/resources/_DSD-implementation-guide-toplevel-1_1.htm
> [1] https://developer.arm.com/docs/den0067/latest/acpi-for-coresighttm-10-platform-design-document
> [2] https://github.com/tianocore/edk2-platforms.git

The kernel patches are also available at :

git://linux-arm.org/linux-skp.git coresight-acpi/v4

Suzuki

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Leo Yan]

Hi Suzuki,

On Wed, May 22, 2019 at 11:34:33AM +0100, Suzuki K Poulose wrote:

[...]

> Changes since v2:
>  - Drop the patches exposing device links via sysfs, to be posted as separate
>    series.

Thanks for sharing the git tree linkage in another email.  Just want
to confirm, since patch set v3 you have dropped the patch "coresight:
Expose device connections via sysfs" [1], will you send out this patch
after ACPI binding support patches has been merged?

When you send out the new patch for exposing device connection, please
loop me so that I can base on it for perf testing related works.

Thanks,
Leo Yan

[1] https://lkml.org/lkml/2019/4/15/658

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Suzuki K Poulose]

Hi Leo,

On 23/05/2019 15:32, Leo Yan wrote:
> Hi Suzuki,
> 
> On Wed, May 22, 2019 at 11:34:33AM +0100, Suzuki K Poulose wrote:
> 
> [...]
> 
>> Changes since v2:
>>   - Drop the patches exposing device links via sysfs, to be posted as separate
>>     series.
> 
> Thanks for sharing the git tree linkage in another email.  Just want
> to confirm, since patch set v3 you have dropped the patch "coresight:
> Expose device connections via sysfs" [1], will you send out this patch
> after ACPI binding support patches has been merged?

We are awaiting Mike's comment on the approach, as his CTI support also
needs something similar.

> 
> When you send out the new patch for exposing device connection, please
> loop me so that I can base on it for perf testing related works.

Sure, will do. As such, the perf testing should not be affected by that
series. It is just a helper to demonstrate the connections. But yes, it
will definitely help you to choose an ETF for a cluster, if you had multiple
ETFs on the system. Otherwise, you should be OK.

Please be aware that the power management support is missing on ACPI platform.
So you must make sure, by other means, that the debug domain is powered up.


Cheers
Suzuki

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Leo Yan]

Hi Suzuki,

On Thu, May 23, 2019 at 04:31:54PM +0100, Suzuki K Poulose wrote:

[...]

> > When you send out the new patch for exposing device connection, please
> > loop me so that I can base on it for perf testing related works.
> 
> Sure, will do.

Thanks a lot!

> As such, the perf testing should not be affected by that
> series. It is just a helper to demonstrate the connections. But yes, it
> will definitely help you to choose an ETF for a cluster, if you had multiple
> ETFs on the system. Otherwise, you should be OK.

Yeah, the perf testing approach is heavily based on sysfs out/in nodes
to find the trace pathes.

> Please be aware that the power management support is missing on ACPI platform.
> So you must make sure, by other means, that the debug domain is powered up.

Thanks for reminding; for the first step, I will not add any power
management enabling steps in the testing script, we can add the
related operations if later we have clear idea for this.

Thanks,
Leo Yan

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Mike Leach]

Hi Suzuki, Leo

On Thu, 23 May 2019 at 16:32, Suzuki K Poulose <suzuki.poulose@arm.com> wrote:
>
> Hi Leo,
>
> On 23/05/2019 15:32, Leo Yan wrote:
> > Hi Suzuki,
> >
> > On Wed, May 22, 2019 at 11:34:33AM +0100, Suzuki K Poulose wrote:
> >
> > [...]
> >
> >> Changes since v2:
> >>   - Drop the patches exposing device links via sysfs, to be posted as separate
> >>     series.
> >
> > Thanks for sharing the git tree linkage in another email.  Just want
> > to confirm, since patch set v3 you have dropped the patch "coresight:
> > Expose device connections via sysfs" [1], will you send out this patch
> > after ACPI binding support patches has been merged?
>
> We are awaiting Mike's comment on the approach, as his CTI support also
> needs something similar.
>

I fully agree that there is requirement to expose device connections
as Suzuki's patches provided. As commented in the original patch, it
removes the need for users to have knowledge of hardware specifics or
access to device tree source.

For the trace datapath a simple link is sufficient to express this
information. The nature of the data and connection is known - it is
the trace data running from source to sink. The linked components are
guaranteed to be registered coresight devices

However, the requirement for the CTI is different.

CTI is not limited to connecting to other coresight devices. Any
device can be wired into a CTI trigger signal. These devices may or
may not have drivers  / entries in the device tree.
For each connection a client needs to know the signals connected to
the cti, the signal directions, the signal prupose if possible, and
the device connected.
For this reason we dynamically fill out a connections infomation
sub-dir in sysfs containing _name, _trigin_sig, _trigout_sig,
_trigin_type, _trigout_type - described in the patch [1].

This information is sufficient and necessary to enable a user to
program a CTI in most cases.

As an example look at the Juno dtsi in [2].
CTI 0 is connected to ETR, ETF, STM and TPIU - all coresight devices.
CTI 1 is connected to REF_CLK, system profiler and watchdog - no
coresight devices at all.
CTI 2 is connected to ETF, and two ELA devices - so 1 coresight device
and 2 not coresight devices.

So my view is that for the case where CTI is connected to another
CoreSight device the sysfs link could be used in addition to the
information described above.

Regards.

Mike

[1] https://lists.linaro.org/pipermail/coresight/2019-May/002587.html
[2] https://lists.linaro.org/pipermail/coresight/2019-May/002589.html

> >
> > When you send out the new patch for exposing device connection, please
> > loop me so that I can base on it for perf testing related works.
>
> Sure, will do. As such, the perf testing should not be affected by that
> series. It is just a helper to demonstrate the connections. But yes, it
> will definitely help you to choose an ETF for a cluster, if you had multiple
> ETFs on the system. Otherwise, you should be OK.
>
> Please be aware that the power management support is missing on ACPI platform.
> So you must make sure, by other means, that the debug domain is powered up.
>
>
> Cheers
> Suzuki
> _______________________________________________
> CoreSight mailing list
> CoreSight@lists.linaro.org
> https://lists.linaro.org/mailman/listinfo/coresight



--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Leo Yan]

Hi Suzuki,

On Wed, May 22, 2019 at 11:34:33AM +0100, Suzuki K Poulose wrote:
> This series adds the support for CoreSight devices on ACPI based
> platforms. The device connections are encoded as _DSD graph property[0],
> with CoreSight specific extensions to indicate the direction of data
> flow as described in [1]. Components attached to CPUs are listed
> as child devices of the corresponding CPU, removing explicit links
> to the CPU like we do in the DT.
> 
> The majority of the series cleans up the driver and prepares the subsystem
> for platform agnostic firwmare probing, naming scheme, searching etc.
> 
> We introduce platform independent helpers to parse the platform supplied
> information. Thus we rename the platform handling code from:
> 	of_coresight.c  => coresight-platform.c
> 
> The CoreSight driver creates shadow devices that appear on the Coresight
> bus, in addition to the real devices (e.g, AMBA bus devices). The name
> of these devices match the real device. This makes the device name
> a bit cryptic for ACPI platform. So this series also introduces a generic
> platform agnostic device naming scheme for the shadow Coresight devices.
> Towards this we also make changes to the way we lookup devices to resolve
> the connections, as we can't use the names to identify the devices. So,
> we use the "fwnode_handle" of the real device for the device lookups.
> Towards that we clean up the drivers to keep track of the "CoreSight"
> device rather than the "real" device. However, all real operations,
> like DMA allocation, Power management etc. must be performed on
> the real device which is the parent of the shadow device.
> 
> Finally we add the support for parsing the ACPI platform data. The power
> management support is missing in the ACPI (and this is not specific to
> CoreSight). The firmware must ensure that the respective power domains
> are turned on.
> 
> Applies on v5.2-rc1
> 
> Tested on a Juno-r0 board with ACPI bindings patch (Patch 31/30) added on
> top of [2]. You would need to make sure that the debug power domain is
> turned on before the Linux kernel boots. (e.g, connect the DS-5 to the
> Juno board while at UEFI). arm32 code is only compile tested.

After I applied this patch set, I found all device names under
'/sys/bus/event_source/devices/cs_etm/sinks/' have been changed as
below on my DB410c board:
# ls /sys/bus/event_source/devices/cs_etm/sinks/
tmc_etf0  tmc_etr0  tpiu0

This leads to below command failure when open PMU device:
# perf record -e cs_etm/@826000.etr/ --per-thread uname
failed to set sink "826000.etr" on event cs_etm/@826000.etr/ with 2 (No such file or directory)

I must use below command so that perf can match string with the
device name under '/sys/bus/event_source/devices/cs_etm/sinks/':
# perf record -e cs_etm/@tmc_etr0/ --per-thread uname

Seems to me, this is an unexpected change and when I worked on the
patch set v2, IIRC that version still can use '826000.etr' to open PMU
device.

Please help confirm for this.  Thanks!

Leo.

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Leo Yan]

Hi Suzuki, Mathieu,

On Tue, May 28, 2019 at 01:19:24PM +0800, Leo Yan wrote:

[...]

> After I applied this patch set, I found all device names under
> '/sys/bus/event_source/devices/cs_etm/sinks/' have been changed as
> below on my DB410c board:
> # ls /sys/bus/event_source/devices/cs_etm/sinks/
> tmc_etf0  tmc_etr0  tpiu0
> 
> This leads to below command failure when open PMU device:
> # perf record -e cs_etm/@826000.etr/ --per-thread uname
> failed to set sink "826000.etr" on event cs_etm/@826000.etr/ with 2 (No such file or directory)
> 
> I must use below command so that perf can match string with the
> device name under '/sys/bus/event_source/devices/cs_etm/sinks/':
> # perf record -e cs_etm/@tmc_etr0/ --per-thread uname
> 
> Seems to me, this is an unexpected change and when I worked on the
> patch set v2, IIRC that version still can use '826000.etr' to open PMU
> device.
> 
> Please help confirm for this.  Thanks!

Finally, this is narrowed down to the patch 09/30 'coresight: Use
coresight device names for sinks in PMU attribute', so this is
delibrately to change to use new name format for perf command;
if so, maybe also update the documentation to reflect this change?

Thanks,
Leo Yan

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Mathieu Poirier]

Good day,

On Tue, May 28, 2019 at 01:19:24PM +0800, Leo Yan wrote:
> Hi Suzuki,
> 
> On Wed, May 22, 2019 at 11:34:33AM +0100, Suzuki K Poulose wrote:
> > This series adds the support for CoreSight devices on ACPI based
> > platforms. The device connections are encoded as _DSD graph property[0],
> > with CoreSight specific extensions to indicate the direction of data
> > flow as described in [1]. Components attached to CPUs are listed
> > as child devices of the corresponding CPU, removing explicit links
> > to the CPU like we do in the DT.
> > 
> > The majority of the series cleans up the driver and prepares the subsystem
> > for platform agnostic firwmare probing, naming scheme, searching etc.
> > 
> > We introduce platform independent helpers to parse the platform supplied
> > information. Thus we rename the platform handling code from:
> > 	of_coresight.c  => coresight-platform.c
> > 
> > The CoreSight driver creates shadow devices that appear on the Coresight
> > bus, in addition to the real devices (e.g, AMBA bus devices). The name
> > of these devices match the real device. This makes the device name
> > a bit cryptic for ACPI platform. So this series also introduces a generic
> > platform agnostic device naming scheme for the shadow Coresight devices.
> > Towards this we also make changes to the way we lookup devices to resolve
> > the connections, as we can't use the names to identify the devices. So,
> > we use the "fwnode_handle" of the real device for the device lookups.
> > Towards that we clean up the drivers to keep track of the "CoreSight"
> > device rather than the "real" device. However, all real operations,
> > like DMA allocation, Power management etc. must be performed on
> > the real device which is the parent of the shadow device.
> > 
> > Finally we add the support for parsing the ACPI platform data. The power
> > management support is missing in the ACPI (and this is not specific to
> > CoreSight). The firmware must ensure that the respective power domains
> > are turned on.
> > 
> > Applies on v5.2-rc1
> > 
> > Tested on a Juno-r0 board with ACPI bindings patch (Patch 31/30) added on
> > top of [2]. You would need to make sure that the debug power domain is
> > turned on before the Linux kernel boots. (e.g, connect the DS-5 to the
> > Juno board while at UEFI). arm32 code is only compile tested.
> 
> After I applied this patch set, I found all device names under
> '/sys/bus/event_source/devices/cs_etm/sinks/' have been changed as
> below on my DB410c board:
> # ls /sys/bus/event_source/devices/cs_etm/sinks/
> tmc_etf0  tmc_etr0  tpiu0

Yes, that is the expected behavior.

> 
> This leads to below command failure when open PMU device:
> # perf record -e cs_etm/@826000.etr/ --per-thread uname
> failed to set sink "826000.etr" on event cs_etm/@826000.etr/ with 2 (No such file or directory)

Correct.

> 
> I must use below command so that perf can match string with the
> device name under '/sys/bus/event_source/devices/cs_etm/sinks/':
> # perf record -e cs_etm/@tmc_etr0/ --per-thread uname

Correct.

> 
> Seems to me, this is an unexpected change and when I worked on the
> patch set v2, IIRC that version still can use '826000.etr' to open PMU
> device.

Correct - v2 did not address the new naming convention for devices present under
'event_source', something that was corrected in v3.

 
> Please help confirm for this.  Thanks!
> 
> Leo.

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Mathieu Poirier]

On Wed, 22 May 2019 at 04:35, Suzuki K Poulose <suzuki.poulose@arm.com> wrote:
>
> This series adds the support for CoreSight devices on ACPI based
> platforms. The device connections are encoded as _DSD graph property[0],
> with CoreSight specific extensions to indicate the direction of data
> flow as described in [1]. Components attached to CPUs are listed
> as child devices of the corresponding CPU, removing explicit links
> to the CPU like we do in the DT.
>
> The majority of the series cleans up the driver and prepares the subsystem
> for platform agnostic firwmare probing, naming scheme, searching etc.
>
> We introduce platform independent helpers to parse the platform supplied
> information. Thus we rename the platform handling code from:
>         of_coresight.c  => coresight-platform.c
>
> The CoreSight driver creates shadow devices that appear on the Coresight
> bus, in addition to the real devices (e.g, AMBA bus devices). The name
> of these devices match the real device. This makes the device name
> a bit cryptic for ACPI platform. So this series also introduces a generic
> platform agnostic device naming scheme for the shadow Coresight devices.
> Towards this we also make changes to the way we lookup devices to resolve
> the connections, as we can't use the names to identify the devices. So,
> we use the "fwnode_handle" of the real device for the device lookups.
> Towards that we clean up the drivers to keep track of the "CoreSight"
> device rather than the "real" device. However, all real operations,
> like DMA allocation, Power management etc. must be performed on
> the real device which is the parent of the shadow device.
>
> Finally we add the support for parsing the ACPI platform data. The power
> management support is missing in the ACPI (and this is not specific to
> CoreSight). The firmware must ensure that the respective power domains
> are turned on.
>
> Applies on v5.2-rc1
>
> Tested on a Juno-r0 board with ACPI bindings patch (Patch 31/30) added on
> top of [2]. You would need to make sure that the debug power domain is
> turned on before the Linux kernel boots. (e.g, connect the DS-5 to the
> Juno board while at UEFI). arm32 code is only compile tested.
>
> [0] ACPI Device Graphs using _DSD (Not available online yet, approved but
>     awaiting publish and eventually should be linked at).
>     https://uefi.org/sites/default/files/resources/_DSD-implementation-guide-toplevel-1_1.htm
> [1] https://developer.arm.com/docs/den0067/latest/acpi-for-coresighttm-10-platform-design-document
> [2] https://github.com/tianocore/edk2-platforms.git
>
> Changes since v3:
>  - Add tags from Mathieu
>
> Changes since v2:
>  - Fix the symlink name for ETM devices under cs_etm PMU (Patch by Mathieu)
>  - Drop patches merged already in the tree.
>  - Add the tags from Mathieu
>  - More documentation with examples of ACPI graph in ACPI bindings support.
>  - Fix ETM4 error return path (Mathieu)
>  - Drop the patches exposing device links via sysfs, to be posted as separate
>    series.
>  - Drop the generic helper for device search by fwnode for a better cleanup
>    later.
>  - Split the ACPI bindings support patch for AMBA and platform devices.
>  - Return integer error for <platform>_get_platform_data() helpers.
>  - Fix comment about the return code for acpi_get_coresight_cpu().
>  - Ensure we don't have devices part of multiple graphs (Mathieu).
>
> Changes since v1:
>
>  [ http://lists.infradead.org/pipermail/linux-arm-kernel/2019-March/639963.html ]
>
>   - Dropped the replicator driver merge changes as they were pulled already.
>   - Cleanups for Power management in the drivers.
>   - Reuse platform description for connection information. Also introduce
>     routines to clean up the platform description to make sure we drop
>     the references (fwnode_handle).
>   - Add RFC patches for exposing the device-links via sysfs.
>   - Drop tracking the device in favour of coresight_device.
>   - Name etb10 as "etb"
>   - Fix other comments in v1.
>   - Use a generic helper for searching with fwnode_handle rather than adding
>     one for CoreSight.
>
>
> Mathieu Poirier (1):
>   coresight: Use coresight device names for sinks in PMU attribute
>
> Suzuki K Poulose (29):
>   coresight: funnel: Clean up device book keeping
>   coresight: replicator: Cleanup device tracking
>   coresight: tmc: Clean up device specific data
>   coresight: catu: Cleanup device specific data
>   coresight: tpiu: Clean up device specific data
>   coresight: stm: Cleanup device specific data
>   coresight: etm: Clean up device specific data
>   coresight: etb10: Clean up device specific data
>   coresight: Rename of_coresight to coresight-platform
>   coresight: etm3x: Rearrange cp14 access detection
>   coresight: stm: Rearrange probing the stimulus area
>   coresight: tmc-etr: Rearrange probing default buffer size
>   coresight: platform: Make memory allocation helper generic
>   coresight: Make sure device uses DT for obsolete compatible check
>   coresight: Introduce generic platform data helper
>   coresight: Make device to CPU mapping generic
>   coresight: Remove cpu field from platform data
>   coresight: Remove name from platform description
>   coresight: Cleanup coresight_remove_conns
>   coresight: Reuse platform data structure for connection tracking
>   coresight: Rearrange platform data probing
>   coresight: Add support for releasing platform specific data
>   coresight: platform: Use fwnode handle for device search
>   coresight: Use fwnode handle instead of device names
>   coresight: Use platform agnostic names
>   coresight: stm: ACPI support for parsing stimulus base
>   coresight: Support for ACPI bindings
>   coresight: acpi: Support for AMBA components
>   coresight: acpi: Support for platform devices
>
>  drivers/acpi/acpi_amba.c                           |   9 +
>  drivers/hwtracing/coresight/Makefile               |   3 +-
>  drivers/hwtracing/coresight/coresight-catu.c       |  40 +-
>  drivers/hwtracing/coresight/coresight-catu.h       |   1 -
>  drivers/hwtracing/coresight/coresight-cpu-debug.c  |   3 +-
>  drivers/hwtracing/coresight/coresight-etb10.c      |  51 +-
>  drivers/hwtracing/coresight/coresight-etm-perf.c   |   8 +-
>  drivers/hwtracing/coresight/coresight-etm.h        |   6 +-
>  .../hwtracing/coresight/coresight-etm3x-sysfs.c    |  12 +-
>  drivers/hwtracing/coresight/coresight-etm3x.c      |  45 +-
>  drivers/hwtracing/coresight/coresight-etm4x.c      |  37 +-
>  drivers/hwtracing/coresight/coresight-etm4x.h      |   2 -
>  drivers/hwtracing/coresight/coresight-funnel.c     |  35 +-
>  drivers/hwtracing/coresight/coresight-platform.c   | 810 +++++++++++++++++++++
>  drivers/hwtracing/coresight/coresight-priv.h       |   4 +
>  drivers/hwtracing/coresight/coresight-replicator.c |  42 +-
>  drivers/hwtracing/coresight/coresight-stm.c        | 118 ++-
>  drivers/hwtracing/coresight/coresight-tmc-etf.c    |   9 +-
>  drivers/hwtracing/coresight/coresight-tmc-etr.c    |  44 +-
>  drivers/hwtracing/coresight/coresight-tmc.c        |  96 +--
>  drivers/hwtracing/coresight/coresight-tmc.h        |   2 -
>  drivers/hwtracing/coresight/coresight-tpiu.c       |  24 +-
>  drivers/hwtracing/coresight/coresight.c            | 164 ++++-
>  drivers/hwtracing/coresight/of_coresight.c         | 297 --------
>  include/linux/coresight.h                          |  61 +-
>  25 files changed, 1332 insertions(+), 591 deletions(-)
>  create mode 100644 drivers/hwtracing/coresight/coresight-platform.c
>  delete mode 100644 drivers/hwtracing/coresight/of_coresight.c

I have applied this set.

Thanks,
Mathieu

>
> ACPI bindings for Juno-r0 (applies on [2] above)
>
> Suzuki K Poulose (1):
>   edk2-platform: juno: Update ACPI CoreSight Bindings
>
>  Platform/ARM/JunoPkg/AcpiTables/Dsdt.asl | 241 +++++++++++++++++++++++++++++++
>  1 file changed, 241 insertions(+)
>
> --
> 2.7.4
>

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Mathieu Poirier]

On Tue, 28 May 2019 at 11:32, Mathieu Poirier
<mathieu.poirier@linaro.org> wrote:
>
> On Wed, 22 May 2019 at 04:35, Suzuki K Poulose <suzuki.poulose@arm.com> wrote:
> >
> > This series adds the support for CoreSight devices on ACPI based
> > platforms. The device connections are encoded as _DSD graph property[0],
> > with CoreSight specific extensions to indicate the direction of data
> > flow as described in [1]. Components attached to CPUs are listed
> > as child devices of the corresponding CPU, removing explicit links
> > to the CPU like we do in the DT.
> >
> > The majority of the series cleans up the driver and prepares the subsystem
> > for platform agnostic firwmare probing, naming scheme, searching etc.
> >
> > We introduce platform independent helpers to parse the platform supplied
> > information. Thus we rename the platform handling code from:
> >         of_coresight.c  => coresight-platform.c
> >
> > The CoreSight driver creates shadow devices that appear on the Coresight
> > bus, in addition to the real devices (e.g, AMBA bus devices). The name
> > of these devices match the real device. This makes the device name
> > a bit cryptic for ACPI platform. So this series also introduces a generic
> > platform agnostic device naming scheme for the shadow Coresight devices.
> > Towards this we also make changes to the way we lookup devices to resolve
> > the connections, as we can't use the names to identify the devices. So,
> > we use the "fwnode_handle" of the real device for the device lookups.
> > Towards that we clean up the drivers to keep track of the "CoreSight"
> > device rather than the "real" device. However, all real operations,
> > like DMA allocation, Power management etc. must be performed on
> > the real device which is the parent of the shadow device.
> >
> > Finally we add the support for parsing the ACPI platform data. The power
> > management support is missing in the ACPI (and this is not specific to
> > CoreSight). The firmware must ensure that the respective power domains
> > are turned on.
> >
> > Applies on v5.2-rc1
> >
> > Tested on a Juno-r0 board with ACPI bindings patch (Patch 31/30) added on
> > top of [2]. You would need to make sure that the debug power domain is
> > turned on before the Linux kernel boots. (e.g, connect the DS-5 to the
> > Juno board while at UEFI). arm32 code is only compile tested.
> >
> > [0] ACPI Device Graphs using _DSD (Not available online yet, approved but
> >     awaiting publish and eventually should be linked at).
> >     https://uefi.org/sites/default/files/resources/_DSD-implementation-guide-toplevel-1_1.htm
> > [1] https://developer.arm.com/docs/den0067/latest/acpi-for-coresighttm-10-platform-design-document
> > [2] https://github.com/tianocore/edk2-platforms.git
> >
> > Changes since v3:
> >  - Add tags from Mathieu
> >
> > Changes since v2:
> >  - Fix the symlink name for ETM devices under cs_etm PMU (Patch by Mathieu)
> >  - Drop patches merged already in the tree.
> >  - Add the tags from Mathieu
> >  - More documentation with examples of ACPI graph in ACPI bindings support.
> >  - Fix ETM4 error return path (Mathieu)
> >  - Drop the patches exposing device links via sysfs, to be posted as separate
> >    series.
> >  - Drop the generic helper for device search by fwnode for a better cleanup
> >    later.
> >  - Split the ACPI bindings support patch for AMBA and platform devices.
> >  - Return integer error for <platform>_get_platform_data() helpers.
> >  - Fix comment about the return code for acpi_get_coresight_cpu().
> >  - Ensure we don't have devices part of multiple graphs (Mathieu).
> >
> > Changes since v1:
> >
> >  [ http://lists.infradead.org/pipermail/linux-arm-kernel/2019-March/639963.html ]
> >
> >   - Dropped the replicator driver merge changes as they were pulled already.
> >   - Cleanups for Power management in the drivers.
> >   - Reuse platform description for connection information. Also introduce
> >     routines to clean up the platform description to make sure we drop
> >     the references (fwnode_handle).
> >   - Add RFC patches for exposing the device-links via sysfs.
> >   - Drop tracking the device in favour of coresight_device.
> >   - Name etb10 as "etb"
> >   - Fix other comments in v1.
> >   - Use a generic helper for searching with fwnode_handle rather than adding
> >     one for CoreSight.
> >
> >
> > Mathieu Poirier (1):
> >   coresight: Use coresight device names for sinks in PMU attribute
> >
> > Suzuki K Poulose (29):
> >   coresight: funnel: Clean up device book keeping
> >   coresight: replicator: Cleanup device tracking
> >   coresight: tmc: Clean up device specific data
> >   coresight: catu: Cleanup device specific data
> >   coresight: tpiu: Clean up device specific data
> >   coresight: stm: Cleanup device specific data
> >   coresight: etm: Clean up device specific data
> >   coresight: etb10: Clean up device specific data
> >   coresight: Rename of_coresight to coresight-platform
> >   coresight: etm3x: Rearrange cp14 access detection
> >   coresight: stm: Rearrange probing the stimulus area
> >   coresight: tmc-etr: Rearrange probing default buffer size
> >   coresight: platform: Make memory allocation helper generic
> >   coresight: Make sure device uses DT for obsolete compatible check
> >   coresight: Introduce generic platform data helper
> >   coresight: Make device to CPU mapping generic
> >   coresight: Remove cpu field from platform data
> >   coresight: Remove name from platform description
> >   coresight: Cleanup coresight_remove_conns
> >   coresight: Reuse platform data structure for connection tracking
> >   coresight: Rearrange platform data probing
> >   coresight: Add support for releasing platform specific data
> >   coresight: platform: Use fwnode handle for device search
> >   coresight: Use fwnode handle instead of device names
> >   coresight: Use platform agnostic names
> >   coresight: stm: ACPI support for parsing stimulus base
> >   coresight: Support for ACPI bindings
> >   coresight: acpi: Support for AMBA components
> >   coresight: acpi: Support for platform devices
> >
> >  drivers/acpi/acpi_amba.c                           |   9 +
> >  drivers/hwtracing/coresight/Makefile               |   3 +-
> >  drivers/hwtracing/coresight/coresight-catu.c       |  40 +-
> >  drivers/hwtracing/coresight/coresight-catu.h       |   1 -
> >  drivers/hwtracing/coresight/coresight-cpu-debug.c  |   3 +-
> >  drivers/hwtracing/coresight/coresight-etb10.c      |  51 +-
> >  drivers/hwtracing/coresight/coresight-etm-perf.c   |   8 +-
> >  drivers/hwtracing/coresight/coresight-etm.h        |   6 +-
> >  .../hwtracing/coresight/coresight-etm3x-sysfs.c    |  12 +-
> >  drivers/hwtracing/coresight/coresight-etm3x.c      |  45 +-
> >  drivers/hwtracing/coresight/coresight-etm4x.c      |  37 +-
> >  drivers/hwtracing/coresight/coresight-etm4x.h      |   2 -
> >  drivers/hwtracing/coresight/coresight-funnel.c     |  35 +-
> >  drivers/hwtracing/coresight/coresight-platform.c   | 810 +++++++++++++++++++++
> >  drivers/hwtracing/coresight/coresight-priv.h       |   4 +
> >  drivers/hwtracing/coresight/coresight-replicator.c |  42 +-
> >  drivers/hwtracing/coresight/coresight-stm.c        | 118 ++-
> >  drivers/hwtracing/coresight/coresight-tmc-etf.c    |   9 +-
> >  drivers/hwtracing/coresight/coresight-tmc-etr.c    |  44 +-
> >  drivers/hwtracing/coresight/coresight-tmc.c        |  96 +--
> >  drivers/hwtracing/coresight/coresight-tmc.h        |   2 -
> >  drivers/hwtracing/coresight/coresight-tpiu.c       |  24 +-
> >  drivers/hwtracing/coresight/coresight.c            | 164 ++++-
> >  drivers/hwtracing/coresight/of_coresight.c         | 297 --------
> >  include/linux/coresight.h                          |  61 +-
> >  25 files changed, 1332 insertions(+), 591 deletions(-)
> >  create mode 100644 drivers/hwtracing/coresight/coresight-platform.c
> >  delete mode 100644 drivers/hwtracing/coresight/of_coresight.c
>
> I have applied this set.

As Leo pointed out it would be interesting to update the documentation
in "Documentation/trace/coresight.txt".

>
> Thanks,
> Mathieu
>
> >
> > ACPI bindings for Juno-r0 (applies on [2] above)
> >
> > Suzuki K Poulose (1):
> >   edk2-platform: juno: Update ACPI CoreSight Bindings
> >
> >  Platform/ARM/JunoPkg/AcpiTables/Dsdt.asl | 241 +++++++++++++++++++++++++++++++
> >  1 file changed, 241 insertions(+)
> >
> > --
> > 2.7.4
> >

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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Suzuki K Poulose]

Hi Mathieu,

On 28/05/2019 18:36, Mathieu Poirier wrote:
> On Tue, 28 May 2019 at 11:32, Mathieu Poirier
> <mathieu.poirier@linaro.org> wrote:
>>

...

>>
>> I have applied this set.

Thanks.

> 
> As Leo pointed out it would be interesting to update the documentation
> in "Documentation/trace/coresight.txt".

I am on it, will send it out soon.

Cheers
Suzuki



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Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

[Leo Yan]

On Tue, May 28, 2019 at 08:51:26AM -0600, Mathieu Poirier wrote:
> Good day,
> 
> On Tue, May 28, 2019 at 01:19:24PM +0800, Leo Yan wrote:
> > Hi Suzuki,
> > 
> > On Wed, May 22, 2019 at 11:34:33AM +0100, Suzuki K Poulose wrote:
> > > This series adds the support for CoreSight devices on ACPI based
> > > platforms. The device connections are encoded as _DSD graph property[0],
> > > with CoreSight specific extensions to indicate the direction of data
> > > flow as described in [1]. Components attached to CPUs are listed
> > > as child devices of the corresponding CPU, removing explicit links
> > > to the CPU like we do in the DT.
> > > 
> > > The majority of the series cleans up the driver and prepares the subsystem
> > > for platform agnostic firwmare probing, naming scheme, searching etc.
> > > 
> > > We introduce platform independent helpers to parse the platform supplied
> > > information. Thus we rename the platform handling code from:
> > > 	of_coresight.c  => coresight-platform.c
> > > 
> > > The CoreSight driver creates shadow devices that appear on the Coresight
> > > bus, in addition to the real devices (e.g, AMBA bus devices). The name
> > > of these devices match the real device. This makes the device name
> > > a bit cryptic for ACPI platform. So this series also introduces a generic
> > > platform agnostic device naming scheme for the shadow Coresight devices.
> > > Towards this we also make changes to the way we lookup devices to resolve
> > > the connections, as we can't use the names to identify the devices. So,
> > > we use the "fwnode_handle" of the real device for the device lookups.
> > > Towards that we clean up the drivers to keep track of the "CoreSight"
> > > device rather than the "real" device. However, all real operations,
> > > like DMA allocation, Power management etc. must be performed on
> > > the real device which is the parent of the shadow device.
> > > 
> > > Finally we add the support for parsing the ACPI platform data. The power
> > > management support is missing in the ACPI (and this is not specific to
> > > CoreSight). The firmware must ensure that the respective power domains
> > > are turned on.
> > > 
> > > Applies on v5.2-rc1
> > > 
> > > Tested on a Juno-r0 board with ACPI bindings patch (Patch 31/30) added on
> > > top of [2]. You would need to make sure that the debug power domain is
> > > turned on before the Linux kernel boots. (e.g, connect the DS-5 to the
> > > Juno board while at UEFI). arm32 code is only compile tested.
> > 
> > After I applied this patch set, I found all device names under
> > '/sys/bus/event_source/devices/cs_etm/sinks/' have been changed as
> > below on my DB410c board:
> > # ls /sys/bus/event_source/devices/cs_etm/sinks/
> > tmc_etf0  tmc_etr0  tpiu0
> 
> Yes, that is the expected behavior.
> 
> > 
> > This leads to below command failure when open PMU device:
> > # perf record -e cs_etm/@826000.etr/ --per-thread uname
> > failed to set sink "826000.etr" on event cs_etm/@826000.etr/ with 2 (No such file or directory)
> 
> Correct.
> 
> > 
> > I must use below command so that perf can match string with the
> > device name under '/sys/bus/event_source/devices/cs_etm/sinks/':
> > # perf record -e cs_etm/@tmc_etr0/ --per-thread uname
> 
> Correct.
> 
> > 
> > Seems to me, this is an unexpected change and when I worked on the
> > patch set v2, IIRC that version still can use '826000.etr' to open PMU
> > device.
> 
> Correct - v2 did not address the new naming convention for devices present under
> 'event_source', something that was corrected in v3.

Thanks for confirmation, Mathieu.

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Re: [PATCH v4 26/30] coresight: Use platform agnostic names

[Mike Leach]

Hi,

Why am I not seeing references to coresight-cpu-debug in here? In
other places in this patchset CPU debug has been changed, but there
appears to be no platform agnostic name here, nor any ACPI type name
either. Is cpu-debug remaining device tree only? Should CPU debug not
be treated like ETM and get a cpu centric name?

Mike

On Wed, 22 May 2019 at 11:39, Suzuki K Poulose <suzuki.poulose@arm.com> wrote:
>
> So far we have reused the name of the "platform" device for
> the CoreSight device. But this is not very intuitive when
> we move to ACPI. Also, the ACPI device names have ":" in them
> (e.g, ARMHC97C:01), which the perf tool doesn't like very much.
> This patch introduces a generic naming scheme, givin more intuitive
> names for the devices that appear on the CoreSight bus.
> The names follow the pattern "prefix" followed by "index" (e.g, etm5).
> We maintain a list of allocated devices per "prefix" to make sure
> we don't allocate a new name when it is reprobed (e.g, due to
> unsatisifed device dependencies). So, we maintain the list
> of "fwnodes" of the parent devices to allocate a consistent name.
> All devices except the ETMs get an index allocated in the order
> of probing. ETMs get an index based on the CPU they are attached to.
>
> TMC devices are named using "tmc_etf", "tmc_etb", and "tmc_etr"
> prefixes depending on the configuration of the device.
>
> The replicators and funnels are not classified as dynamic/static
> anymore. One could easily figure that out by checking the presence
> of "mgmt" registers under sysfs.
>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-catu.c       |  7 ++-
>  drivers/hwtracing/coresight/coresight-etb10.c      |  7 ++-
>  drivers/hwtracing/coresight/coresight-etm3x.c      |  4 +-
>  drivers/hwtracing/coresight/coresight-etm4x.c      |  4 +-
>  drivers/hwtracing/coresight/coresight-funnel.c     |  7 ++-
>  drivers/hwtracing/coresight/coresight-replicator.c |  7 ++-
>  drivers/hwtracing/coresight/coresight-stm.c        | 12 +++--
>  drivers/hwtracing/coresight/coresight-tmc.c        | 15 +++++-
>  drivers/hwtracing/coresight/coresight-tpiu.c       |  7 ++-
>  drivers/hwtracing/coresight/coresight.c            | 58 ++++++++++++++++++++++
>  include/linux/coresight.h                          | 25 +++++++++-
>  11 files changed, 141 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
> index 1c1ad12..16ebf38 100644
> --- a/drivers/hwtracing/coresight/coresight-catu.c
> +++ b/drivers/hwtracing/coresight/coresight-catu.c
> @@ -28,6 +28,8 @@
>  #define catu_dbg(x, ...) do {} while (0)
>  #endif
>
> +DEFINE_CORESIGHT_DEVLIST(catu_devs, "catu");
> +
>  struct catu_etr_buf {
>         struct tmc_sg_table *catu_table;
>         dma_addr_t sladdr;
> @@ -505,6 +507,10 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
>         struct device *dev = &adev->dev;
>         void __iomem *base;
>
> +       catu_desc.name = coresight_alloc_device_name(&catu_devs, dev);
> +       if (!catu_desc.name)
> +               return -ENOMEM;
> +
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>         if (!drvdata) {
>                 ret = -ENOMEM;
> @@ -551,7 +557,6 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
>         catu_desc.type = CORESIGHT_DEV_TYPE_HELPER;
>         catu_desc.subtype.helper_subtype = CORESIGHT_DEV_SUBTYPE_HELPER_CATU;
>         catu_desc.ops = &catu_ops;
> -       catu_desc.name = dev_name(dev);
>
>         drvdata->csdev = coresight_register(&catu_desc);
>         if (IS_ERR(drvdata->csdev))
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index 09df827..bdd4fd5 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -63,6 +63,8 @@
>  #define ETB_FFSR_BIT           1
>  #define ETB_FRAME_SIZE_WORDS   4
>
> +DEFINE_CORESIGHT_DEVLIST(etb_devs, "etb");
> +
>  /**
>   * struct etb_drvdata - specifics associated to an ETB component
>   * @base:      memory mapped base address for this component.
> @@ -726,6 +728,10 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
>         struct resource *res = &adev->res;
>         struct coresight_desc desc = { 0 };
>
> +       desc.name = coresight_alloc_device_name(&etb_devs, dev);
> +       if (!desc.name)
> +               return -ENOMEM;
> +
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>         if (!drvdata)
>                 return -ENOMEM;
> @@ -770,7 +776,6 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
>         desc.ops = &etb_cs_ops;
>         desc.pdata = pdata;
>         desc.dev = dev;
> -       desc.name = dev_name(dev);
>         desc.groups = coresight_etb_groups;
>         drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev))
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
> index f2d4616..bed7291 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
> @@ -815,6 +815,9 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
>         }
>
>         drvdata->cpu = coresight_get_cpu(dev);
> +       desc.name  = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
> +       if (!desc.name)
> +               return -ENOMEM;
>
>         cpus_read_lock();
>         etmdrvdata[drvdata->cpu] = drvdata;
> @@ -856,7 +859,6 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
>         desc.ops = &etm_cs_ops;
>         desc.pdata = pdata;
>         desc.dev = dev;
> -       desc.name = dev_name(dev);
>         desc.groups = coresight_etm_groups;
>         drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index 1609da1..7fe2661 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -1101,6 +1101,9 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
>         spin_lock_init(&drvdata->spinlock);
>
>         drvdata->cpu = coresight_get_cpu(dev);
> +       desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
> +       if (!desc.name)
> +               return -ENOMEM;
>
>         cpus_read_lock();
>         etmdrvdata[drvdata->cpu] = drvdata;
> @@ -1144,7 +1147,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
>         desc.pdata = pdata;
>         desc.dev = dev;
>         desc.groups = coresight_etmv4_groups;
> -       desc.name = dev_name(dev);
>         drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
>                 ret = PTR_ERR(drvdata->csdev);
> diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
> index 75fa2d3..5867fcb 100644
> --- a/drivers/hwtracing/coresight/coresight-funnel.c
> +++ b/drivers/hwtracing/coresight/coresight-funnel.c
> @@ -29,6 +29,8 @@
>  #define FUNNEL_HOLDTIME                (0x7 << FUNNEL_HOLDTIME_SHFT)
>  #define FUNNEL_ENSx_MASK       0xff
>
> +DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
> +
>  /**
>   * struct funnel_drvdata - specifics associated to a funnel component
>   * @base:      memory mapped base address for this component.
> @@ -192,6 +194,10 @@ static int funnel_probe(struct device *dev, struct resource *res)
>             of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
>                 pr_warn_once("Uses OBSOLETE CoreSight funnel binding\n");
>
> +       desc.name = coresight_alloc_device_name(&funnel_devs, dev);
> +       if (!desc.name)
> +               return -ENOMEM;
> +
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>         if (!drvdata)
>                 return -ENOMEM;
> @@ -231,7 +237,6 @@ static int funnel_probe(struct device *dev, struct resource *res)
>         desc.ops = &funnel_cs_ops;
>         desc.pdata = pdata;
>         desc.dev = dev;
> -       desc.name = dev_name(dev);
>         drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
>                 ret = PTR_ERR(drvdata->csdev);
> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
> index 64dfde7..c0e4225 100644
> --- a/drivers/hwtracing/coresight/coresight-replicator.c
> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
> @@ -22,6 +22,8 @@
>  #define REPLICATOR_IDFILTER0           0x000
>  #define REPLICATOR_IDFILTER1           0x004
>
> +DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
> +
>  /**
>   * struct replicator_drvdata - specifics associated to a replicator component
>   * @base:      memory mapped base address for this component. Also indicates
> @@ -183,6 +185,10 @@ static int replicator_probe(struct device *dev, struct resource *res)
>             of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
>                 pr_warn_once("Uses OBSOLETE CoreSight replicator binding\n");
>
> +       desc.name = coresight_alloc_device_name(&replicator_devs, dev);
> +       if (!desc.name)
> +               return -ENOMEM;
> +
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>         if (!drvdata)
>                 return -ENOMEM;
> @@ -222,7 +228,6 @@ static int replicator_probe(struct device *dev, struct resource *res)
>         desc.ops = &replicator_cs_ops;
>         desc.pdata = dev->platform_data;
>         desc.dev = dev;
> -       desc.name = dev_name(dev);
>
>         drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index 03528f3..e3e2b00 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -107,6 +107,8 @@ struct channel_space {
>         unsigned long           *guaranteed;
>  };
>
> +DEFINE_CORESIGHT_DEVLIST(stm_devs, "stm");
> +
>  /**
>   * struct stm_drvdata - specifics associated to an STM component
>   * @base:              memory mapped base address for this component.
> @@ -810,6 +812,10 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
>         size_t bitmap_size;
>         struct coresight_desc desc = { 0 };
>
> +       desc.name = coresight_alloc_device_name(&stm_devs, dev);
> +       if (!desc.name)
> +               return -ENOMEM;
> +
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>         if (!drvdata)
>                 return -ENOMEM;
> @@ -854,11 +860,12 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
>         spin_lock_init(&drvdata->spinlock);
>
>         stm_init_default_data(drvdata);
> -       stm_init_generic_data(drvdata, dev_name(dev));
> +       stm_init_generic_data(drvdata, desc.name);
>
>         if (stm_register_device(dev, &drvdata->stm, THIS_MODULE)) {
>                 dev_info(dev,
> -                        "stm_register_device failed, probing deferred\n");
> +                        "%s : stm_register_device failed, probing deferred\n",
> +                        desc.name);
>                 return -EPROBE_DEFER;
>         }
>
> @@ -874,7 +881,6 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
>         desc.ops = &stm_cs_ops;
>         desc.pdata = pdata;
>         desc.dev = dev;
> -       desc.name = dev_name(dev);
>         desc.groups = coresight_stm_groups;
>         drvdata->csdev = coresight_register(&desc);
>         if (IS_ERR(drvdata->csdev)) {
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
> index 212630e..be37aff 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc.c
> @@ -27,6 +27,10 @@
>  #include "coresight-priv.h"
>  #include "coresight-tmc.h"
>
> +DEFINE_CORESIGHT_DEVLIST(etb_devs, "tmc_etb");
> +DEFINE_CORESIGHT_DEVLIST(etf_devs, "tmc_etf");
> +DEFINE_CORESIGHT_DEVLIST(etr_devs, "tmc_etr");
> +
>  void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
>  {
>         /* Ensure formatter, unformatter and hardware fifo are empty */
> @@ -397,6 +401,7 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>         struct tmc_drvdata *drvdata;
>         struct resource *res = &adev->res;
>         struct coresight_desc desc = { 0 };
> +       struct coresight_dev_list *dev_list = NULL;
>
>         ret = -ENOMEM;
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> @@ -429,13 +434,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>
>         desc.dev = dev;
>         desc.groups = coresight_tmc_groups;
> -       desc.name = dev_name(dev);
>
>         switch (drvdata->config_type) {
>         case TMC_CONFIG_TYPE_ETB:
>                 desc.type = CORESIGHT_DEV_TYPE_SINK;
>                 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
>                 desc.ops = &tmc_etb_cs_ops;
> +               dev_list = &etb_devs;
>                 break;
>         case TMC_CONFIG_TYPE_ETR:
>                 desc.type = CORESIGHT_DEV_TYPE_SINK;
> @@ -447,11 +452,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>                         goto out;
>                 idr_init(&drvdata->idr);
>                 mutex_init(&drvdata->idr_mutex);
> +               dev_list = &etr_devs;
>                 break;
>         case TMC_CONFIG_TYPE_ETF:
>                 desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
>                 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
>                 desc.ops = &tmc_etf_cs_ops;
> +               dev_list = &etf_devs;
>                 break;
>         default:
>                 pr_err("%s: Unsupported TMC config\n", desc.name);
> @@ -459,6 +466,12 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
>                 goto out;
>         }
>
> +       desc.name = coresight_alloc_device_name(dev_list, dev);
> +       if (!desc.name) {
> +               ret = -ENOMEM;
> +               goto out;
> +       }
> +
>         pdata = coresight_get_platform_data(dev);
>         if (IS_ERR(pdata)) {
>                 ret = PTR_ERR(pdata);
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index b699d61..f8583e4 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -47,6 +47,8 @@
>  #define FFCR_FON_MAN           BIT(6)
>  #define FFCR_STOP_FI           BIT(12)
>
> +DEFINE_CORESIGHT_DEVLIST(tpiu_devs, "tpiu");
> +
>  /**
>   * @base:      memory mapped base address for this component.
>   * @atclk:     optional clock for the core parts of the TPIU.
> @@ -125,6 +127,10 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
>         struct resource *res = &adev->res;
>         struct coresight_desc desc = { 0 };
>
> +       desc.name = coresight_alloc_device_name(&tpiu_devs, dev);
> +       if (!desc.name)
> +               return -ENOMEM;
> +
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>         if (!drvdata)
>                 return -ENOMEM;
> @@ -157,7 +163,6 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
>         desc.ops = &tpiu_cs_ops;
>         desc.pdata = pdata;
>         desc.dev = dev;
> -       desc.name = dev_name(dev);
>         drvdata->csdev = coresight_register(&desc);
>
>         if (!IS_ERR(drvdata->csdev)) {
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index 1287778..86d1fc2 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -1291,3 +1291,61 @@ void coresight_unregister(struct coresight_device *csdev)
>         device_unregister(&csdev->dev);
>  }
>  EXPORT_SYMBOL_GPL(coresight_unregister);
> +
> +
> +/*
> + * coresight_search_device_idx - Search the fwnode handle of a device
> + * in the given dev_idx list. Must be called with the coresight_mutex held.
> + *
> + * Returns the index of the entry, when found. Otherwise, -ENOENT.
> + */
> +static inline int coresight_search_device_idx(struct coresight_dev_list *dict,
> +                                             struct fwnode_handle *fwnode)
> +{
> +       int i;
> +
> +       for (i = 0; i < dict->nr_idx; i++)
> +               if (dict->fwnode_list[i] == fwnode)
> +                       return i;
> +       return -ENOENT;
> +}
> +
> +/*
> + * coresight_alloc_device_name - Get an index for a given device in the
> + * device index list specific to a driver. An index is allocated for a
> + * device and is tracked with the fwnode_handle to prevent allocating
> + * duplicate indices for the same device (e.g, if we defer probing of
> + * a device due to dependencies), in case the index is requested again.
> + */
> +char *coresight_alloc_device_name(struct coresight_dev_list *dict,
> +                                 struct device *dev)
> +{
> +       int idx;
> +       char *name = NULL;
> +       struct fwnode_handle **list;
> +
> +       mutex_lock(&coresight_mutex);
> +
> +       idx = coresight_search_device_idx(dict, dev_fwnode(dev));
> +       if (idx < 0) {
> +               /* Make space for the new entry */
> +               idx = dict->nr_idx;
> +               list = krealloc(dict->fwnode_list,
> +                               (idx + 1) * sizeof(*dict->fwnode_list),
> +                               GFP_KERNEL);
> +               if (ZERO_OR_NULL_PTR(list)) {
> +                       idx = -ENOMEM;
> +                       goto done;
> +               }
> +
> +               list[idx] = dev_fwnode(dev);
> +               dict->fwnode_list = list;
> +               dict->nr_idx = idx + 1;
> +       }
> +
> +       name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
> +done:
> +       mutex_unlock(&coresight_mutex);
> +       return name;
> +}
> +EXPORT_SYMBOL_GPL(coresight_alloc_device_name);
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index b40544b..a2b6882 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -168,6 +168,28 @@ struct coresight_device {
>         struct dev_ext_attribute *ea;
>  };
>
> +/*
> + * coresight_dev_list - Mapping for devices to "name" index for device
> + * names.
> + *
> + * @nr_idx:            Number of entries already allocated.
> + * @pfx:               Prefix pattern for device name.
> + * @fwnode_list:       Array of fwnode_handles associated with each allocated
> + *                     index, upto nr_idx entries.
> + */
> +struct coresight_dev_list {
> +       int                     nr_idx;
> +       const char              *pfx;
> +       struct fwnode_handle    **fwnode_list;
> +};
> +
> +#define DEFINE_CORESIGHT_DEVLIST(var, dev_pfx)                         \
> +static struct coresight_dev_list (var) = {                             \
> +                                               .pfx = dev_pfx,         \
> +                                               .nr_idx = 0,            \
> +                                               .fwnode_list = NULL,    \
> +}
> +
>  #define to_coresight_device(d) container_of(d, struct coresight_device, dev)
>
>  #define source_ops(csdev)      csdev->ops->source_ops
> @@ -261,7 +283,8 @@ extern int coresight_claim_device_unlocked(void __iomem *base);
>
>  extern void coresight_disclaim_device(void __iomem *base);
>  extern void coresight_disclaim_device_unlocked(void __iomem *base);
> -
> +extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
> +                                        struct device *dev);
>  #else
>  static inline struct coresight_device *
>  coresight_register(struct coresight_desc *desc) { return NULL; }
> --
> 2.7.4
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel



-- 
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK

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Re: [PATCH v4 17/30] coresight: Make device to CPU mapping generic

[Mike Leach]

Hi,

On Wed, 22 May 2019 at 11:37, Suzuki K Poulose <suzuki.poulose@arm.com> wrote:
>
> The CoreSight components ETM and CPU-Debug are always associated
> with CPUs. Replace the of_coresight_get_cpu() with a platform
> agnostic helper, in preparation to add ACPI support.
>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/hwtracing/coresight/coresight-cpu-debug.c |  3 +--
>  drivers/hwtracing/coresight/coresight-platform.c  | 18 +++++++++++++-----
>  include/linux/coresight.h                         |  7 +------
>  3 files changed, 15 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> index e8819d7..07a1367 100644
> --- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
> +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> @@ -572,14 +572,13 @@ static int debug_probe(struct amba_device *adev, const struct amba_id *id)
>         struct device *dev = &adev->dev;
>         struct debug_drvdata *drvdata;
>         struct resource *res = &adev->res;
> -       struct device_node *np = adev->dev.of_node;
>         int ret;
>
>         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>         if (!drvdata)
>                 return -ENOMEM;
>
> -       drvdata->cpu = np ? of_coresight_get_cpu(np) : 0;
> +       drvdata->cpu = coresight_get_cpu(dev);
>         if (per_cpu(debug_drvdata, drvdata->cpu)) {
>                 dev_err(dev, "CPU%d drvdata has already been initialized\n",
>                         drvdata->cpu);
> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
> index 5d78f4f..ba8c146 100644
> --- a/drivers/hwtracing/coresight/coresight-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-platform.c
> @@ -151,12 +151,14 @@ static void of_coresight_get_ports(const struct device_node *node,
>         }
>  }
>
> -int of_coresight_get_cpu(const struct device_node *node)
> +static int of_coresight_get_cpu(struct device *dev)
>  {
>         int cpu;
>         struct device_node *dn;
>
> -       dn = of_parse_phandle(node, "cpu", 0);
> +       if (!dev->of_node)
> +               return 0;
> +       dn = of_parse_phandle(dev->of_node, "cpu", 0);
>         /* Affinity defaults to CPU0 */
>         if (!dn)
>                 return 0;
> @@ -166,7 +168,6 @@ int of_coresight_get_cpu(const struct device_node *node)
>         /* Affinity to CPU0 if no cpu nodes are found */
>         return (cpu < 0) ? 0 : cpu;
>  }
> -EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
>
>  /*
>   * of_coresight_parse_endpoint : Parse the given output endpoint @ep
> @@ -240,8 +241,6 @@ static int of_get_coresight_platform_data(struct device *dev,
>         bool legacy_binding = false;
>         struct device_node *node = dev->of_node;
>
> -       pdata->cpu = of_coresight_get_cpu(node);
> -
>         /* Get the number of input and output port for this component */
>         of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
>
> @@ -300,6 +299,14 @@ of_get_coresight_platform_data(struct device *dev,
>  }
>  #endif
>
> +int coresight_get_cpu(struct device *dev)
> +{
> +       if (is_of_node(dev->fwnode))
> +               return of_coresight_get_cpu(dev);

No of_coresight_get_cpu() will be defined if CONFIG_OF _not_ defined.
This will hit an implicit declaration compile error in this case.

Mike

> +       return 0;
> +}
> +EXPORT_SYMBOL_GPL(coresight_get_cpu);
> +
>  struct coresight_platform_data *
>  coresight_get_platform_data(struct device *dev)
>  {
> @@ -318,6 +325,7 @@ coresight_get_platform_data(struct device *dev)
>
>         /* Use device name as sysfs handle */
>         pdata->name = dev_name(dev);
> +       pdata->cpu = coresight_get_cpu(dev);
>
>         if (is_of_node(fwnode))
>                 ret = of_get_coresight_platform_data(dev, pdata);
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index e2b95e0..98a4440 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -292,12 +292,7 @@ static inline void coresight_disclaim_device_unlocked(void __iomem *base) {}
>
>  #endif
>
> -#ifdef CONFIG_OF
> -extern int of_coresight_get_cpu(const struct device_node *node);
> -#else
> -static inline int of_coresight_get_cpu(const struct device_node *node)
> -{ return 0; }
> -#endif
> +extern int coresight_get_cpu(struct device *dev);
>
>  struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
>
> --
> 2.7.4
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel



-- 
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK

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Re: [PATCH v4 26/30] coresight: Use platform agnostic names

[Suzuki K Poulose]

Hi Mike,

On 29/05/2019 10:32, Mike Leach wrote:
> Hi,
> 
> Why am I not seeing references to coresight-cpu-debug in here? In
> other places in this patchset CPU debug has been changed, but there
> appears to be no platform agnostic name here, nor any ACPI type name
> either. Is cpu-debug remaining device tree only? Should CPU debug not
> be treated like ETM and get a cpu centric name?

Thats because they are not registered as coresight devices and thus do
not appear on the CoreSight bus under /sys/bus/coresight/. This set is
only tuning the "coresight" device names, linked to the real amba device.

Cheers
Suzuki

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Re: [PATCH v4 17/30] coresight: Make device to CPU mapping generic

[Suzuki K Poulose]

On 03/06/2019 11:07, Mike Leach wrote:
> Hi,
> 
> On Wed, 22 May 2019 at 11:37, Suzuki K Poulose <suzuki.poulose@arm.com> wrote:
>>
>> The CoreSight components ETM and CPU-Debug are always associated
>> with CPUs. Replace the of_coresight_get_cpu() with a platform
>> agnostic helper, in preparation to add ACPI support.
>>
>> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-cpu-debug.c |  3 +--
>>   drivers/hwtracing/coresight/coresight-platform.c  | 18 +++++++++++++-----
>>   include/linux/coresight.h                         |  7 +------
>>   3 files changed, 15 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c
>> index e8819d7..07a1367 100644
>> --- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
>> +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c
>> @@ -572,14 +572,13 @@ static int debug_probe(struct amba_device *adev, const struct amba_id *id)
>>          struct device *dev = &adev->dev;
>>          struct debug_drvdata *drvdata;
>>          struct resource *res = &adev->res;
>> -       struct device_node *np = adev->dev.of_node;
>>          int ret;
>>
>>          drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>>          if (!drvdata)
>>                  return -ENOMEM;
>>
>> -       drvdata->cpu = np ? of_coresight_get_cpu(np) : 0;
>> +       drvdata->cpu = coresight_get_cpu(dev);
>>          if (per_cpu(debug_drvdata, drvdata->cpu)) {
>>                  dev_err(dev, "CPU%d drvdata has already been initialized\n",
>>                          drvdata->cpu);
>> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
>> index 5d78f4f..ba8c146 100644
>> --- a/drivers/hwtracing/coresight/coresight-platform.c
>> +++ b/drivers/hwtracing/coresight/coresight-platform.c
>> @@ -151,12 +151,14 @@ static void of_coresight_get_ports(const struct device_node *node,
>>          }
>>   }
>>
>> -int of_coresight_get_cpu(const struct device_node *node)
>> +static int of_coresight_get_cpu(struct device *dev)
>>   {
>>          int cpu;
>>          struct device_node *dn;
>>
>> -       dn = of_parse_phandle(node, "cpu", 0);
>> +       if (!dev->of_node)
>> +               return 0;
>> +       dn = of_parse_phandle(dev->of_node, "cpu", 0);
>>          /* Affinity defaults to CPU0 */
>>          if (!dn)
>>                  return 0;
>> @@ -166,7 +168,6 @@ int of_coresight_get_cpu(const struct device_node *node)
>>          /* Affinity to CPU0 if no cpu nodes are found */
>>          return (cpu < 0) ? 0 : cpu;
>>   }
>> -EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
>>
>>   /*
>>    * of_coresight_parse_endpoint : Parse the given output endpoint @ep
>> @@ -240,8 +241,6 @@ static int of_get_coresight_platform_data(struct device *dev,
>>          bool legacy_binding = false;
>>          struct device_node *node = dev->of_node;
>>
>> -       pdata->cpu = of_coresight_get_cpu(node);
>> -
>>          /* Get the number of input and output port for this component */
>>          of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
>>
>> @@ -300,6 +299,14 @@ of_get_coresight_platform_data(struct device *dev,
>>   }
>>   #endif
>>
>> +int coresight_get_cpu(struct device *dev)
>> +{
>> +       if (is_of_node(dev->fwnode))
>> +               return of_coresight_get_cpu(dev);
> 
> No of_coresight_get_cpu() will be defined if CONFIG_OF _not_ defined.
> This will hit an implicit declaration compile error in this case.

Thanks for catching it and you're right. I will fix this.

Cheers
Suzuki

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