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* [PATCH v2 0/2] Base enablement of IOMMU debugfs support
@ 2018-04-04 18:54 Gary R Hook
  2018-04-04 18:54 ` [PATCH v2 1/2] iommu - Enable debugfs exposure of the IOMMU Gary R Hook
  2018-04-04 18:55 ` [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU Gary R Hook
  0 siblings, 2 replies; 6+ messages in thread
From: Gary R Hook @ 2018-04-04 18:54 UTC (permalink / raw)
  To: iommu; +Cc: joro, linux-kernel

These patches create a top-level function to create a debugfs directory
for the IOMMU, under which drivers may create and populate-specific
directories for their device internals.

Patch 1: general IOMMU enablement
Patch 2: basic AMD enablement to demonstrate linkage with patch 1

Introduce a new Kconfig parameter IOMMU_DEBUG to globally allow or
disallow debugfs code to be built.

Changes since v1:
 - Remove debug cruft
 - Remove cruft produced by design change
 - Change the lock to a mutex
 - Coding style fixes
 - Add a comment to document the framework

---

Gary R Hook (2):
      iommu - Enable debugfs exposure of the IOMMU
      iommu/amd: Add basic debugfs infrastructure for AMD IOMMU


 drivers/iommu/Kconfig             |   11 +++++++
 drivers/iommu/Makefile            |    2 +
 drivers/iommu/amd_iommu_debugfs.c |   45 +++++++++++++++++++++++++++++
 drivers/iommu/amd_iommu_init.c    |    7 +++-
 drivers/iommu/amd_iommu_proto.h   |    8 ++++-
 drivers/iommu/amd_iommu_types.h   |    3 ++
 drivers/iommu/iommu-debugfs.c     |   58 +++++++++++++++++++++++++++++++++++++
 include/linux/iommu.h             |    4 +++
 8 files changed, 135 insertions(+), 3 deletions(-)
 create mode 100644 drivers/iommu/amd_iommu_debugfs.c
 create mode 100644 drivers/iommu/iommu-debugfs.c

--
Signature

^ permalink raw reply	[flat|nested] 6+ messages in thread
* [PATCH v2 1/2] iommu - Enable debugfs exposure of the IOMMU
  2018-04-04 18:54 [PATCH v2 0/2] Base enablement of IOMMU debugfs support Gary R Hook
@ 2018-04-04 18:54 ` Gary R Hook
  2018-04-04 18:55 ` [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU Gary R Hook
  1 sibling, 0 replies; 6+ messages in thread
From: Gary R Hook @ 2018-04-04 18:54 UTC (permalink / raw)
  To: iommu; +Cc: joro, linux-kernel

Provide base enablement for using debugfs to expose internal data of
an IOMMU driver. When called, create the /sys/kernel/debug/iommu
directory.  Emit a strong warning at boot time to indicate that this
feature is enabled.

This patch adds a top-level function that will create the (above)
directory, under which a driver may create a hw-specific directory for
its use. The function

	iommu_debugfs_setup()

returns a pointer to the new dentry structure created for
/sys/kernel/debug/iommu, or NULL in the event of a failure. An IOMMU
driver should call this function first, and then create a directory
beneath it. A driver implementation might look something like:

static struct dentry *my_debugfs;

	struct dentry *d_top;
	if (!my_debugfs) {
		d_top = iommu_debugfs_setup();
		if (d_top)
			my_debugfs = debugfs_create_dir("vendor", d_top);
	}

Since the IOMMU driver can not be removed from the running system, this
patch only provides an "on" function.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
---
 drivers/iommu/Kconfig         |   11 ++++++++
 drivers/iommu/Makefile        |    1 +
 drivers/iommu/iommu-debugfs.c |   58 +++++++++++++++++++++++++++++++++++++++++
 include/linux/iommu.h         |    4 +++
 4 files changed, 74 insertions(+)
 create mode 100644 drivers/iommu/iommu-debugfs.c

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index f3a21343e636..c1e39dabfec2 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -60,6 +60,17 @@ config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
 
 endmenu
 
+config IOMMU_DEBUG
+	bool "Enable IOMMU internals in DebugFS"
+	depends on DEBUG_FS
+	default n
+	help
+	  Allows exposure of IOMMU device internals. This option enables
+	  the use of debugfs by IOMMU drivers as required. Devices can,
+	  at initialization time, cause the IOMMU code to create a top-level
+	  debug/iommu directory, and then populate a subdirectory with
+	  entries as required.
+
 config IOMMU_IOVA
 	tristate
 
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 1fb695854809..5eb1121d54b9 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -2,6 +2,7 @@
 obj-$(CONFIG_IOMMU_API) += iommu.o
 obj-$(CONFIG_IOMMU_API) += iommu-traces.o
 obj-$(CONFIG_IOMMU_API) += iommu-sysfs.o
+obj-$(CONFIG_IOMMU_DEBUG) += iommu-debugfs.o
 obj-$(CONFIG_IOMMU_DMA) += dma-iommu.o
 obj-$(CONFIG_IOMMU_IO_PGTABLE) += io-pgtable.o
 obj-$(CONFIG_IOMMU_IO_PGTABLE_ARMV7S) += io-pgtable-arm-v7s.o
diff --git a/drivers/iommu/iommu-debugfs.c b/drivers/iommu/iommu-debugfs.c
new file mode 100644
index 000000000000..add6f95120e4
--- /dev/null
+++ b/drivers/iommu/iommu-debugfs.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * IOMMU driver
+ *
+ * Copyright (C) 2018 Advanced Micro Devices, Inc.
+ *
+ * Author: Gary R Hook <gary.hook@amd.com>
+ */
+
+#include <linux/pci.h>
+#include <linux/iommu.h>
+#include <linux/debugfs.h>
+
+static struct dentry *iommu_debugfs_dir;
+
+/*
+ * Provide base enablement for using debugfs to expose internal data of an
+ * IOMMU driver. When called, create the /sys/kernel/debug/iommu directory.
+ *
+ * Emit a strong warning at boot time to indicate that this feature is
+ * enabled.
+ *
+ * This top-level function that will create the (above) directory, under a
+ * driver may create a hw-specific directory for its use. The function
+ *
+ *     iommu_debugfs_setup()
+ *
+ * returns a pointer to the new dentry structure created for
+ * /sys/kernel/debug/iommu, or NULL in the event of a failure. An IOMMU
+ * driver should call this function first, and then create a directory
+ * beneath it. A driver implementation might look something like:
+ *
+ * static struct dentry *my_debugfs;
+ *
+ *    struct dentry *d_top;
+ *    if (!my_debugfs) {
+ *        d_top = iommu_debugfs_setup();
+ *        if (d_top)
+ *            my_debugfs = debugfs_create_dir("vendor", d_top);
+ *    }
+ *
+ * Since the IOMMU driver can not be removed from the running system, there
+ * is no need for an "off" function.
+ */
+struct dentry *iommu_debugfs_setup(void)
+{
+	if (!debugfs_initialized())
+		return NULL;
+
+	if (!iommu_debugfs_dir)
+		iommu_debugfs_dir = debugfs_create_dir("iommu", NULL);
+
+	if (iommu_debugfs_dir)
+		pr_warn("WARNING: IOMMU DEBUGFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL\n");
+
+	return iommu_debugfs_dir;
+}
+EXPORT_SYMBOL_GPL(iommu_debugfs_setup);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 41b8c5757859..3dd2e73d31c4 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -412,6 +412,10 @@ void iommu_fwspec_free(struct device *dev);
 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
 
+#ifdef CONFIG_IOMMU_DEBUG
+struct dentry *iommu_debugfs_setup(void);
+#endif
+
 #else /* CONFIG_IOMMU_API */
 
 struct iommu_ops {};

^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU
  2018-04-04 18:54 [PATCH v2 0/2] Base enablement of IOMMU debugfs support Gary R Hook
  2018-04-04 18:54 ` [PATCH v2 1/2] iommu - Enable debugfs exposure of the IOMMU Gary R Hook
@ 2018-04-04 18:55 ` Gary R Hook
  2018-04-05  8:12   ` kbuild test robot
                     ` (2 more replies)
  1 sibling, 3 replies; 6+ messages in thread
From: Gary R Hook @ 2018-04-04 18:55 UTC (permalink / raw)
  To: iommu; +Cc: joro, linux-kernel

Implement a skeleton framework for debugfs support in the
AMD IOMMU.


Signed-off-by: Gary R Hook <gary.hook@amd.com>
---
 drivers/iommu/Makefile            |    1 +
 drivers/iommu/amd_iommu_debugfs.c |   45 +++++++++++++++++++++++++++++++++++++
 drivers/iommu/amd_iommu_init.c    |    7 ++++--
 drivers/iommu/amd_iommu_proto.h   |    8 ++++++-
 drivers/iommu/amd_iommu_types.h   |    3 ++
 5 files changed, 61 insertions(+), 3 deletions(-)
 create mode 100644 drivers/iommu/amd_iommu_debugfs.c

diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 5eb1121d54b9..0ca250f626d9 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_IOMMU_IOVA) += iova.o
 obj-$(CONFIG_OF_IOMMU)	+= of_iommu.o
 obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
 obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
+obj-$(CONFIG_IOMMU_DEBUG) += amd_iommu_debugfs.o
 obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
 obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
 obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
diff --git a/drivers/iommu/amd_iommu_debugfs.c b/drivers/iommu/amd_iommu_debugfs.c
new file mode 100644
index 000000000000..282100a655b3
--- /dev/null
+++ b/drivers/iommu/amd_iommu_debugfs.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AMD IOMMU driver
+ *
+ * Copyright (C) 2018 Advanced Micro Devices, Inc.
+ *
+ * Author: Gary R Hook <gary.hook@amd.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/iommu.h>
+#include <linux/pci.h>
+#include "amd_iommu_proto.h"
+#include "amd_iommu_types.h"
+
+static struct dentry *amd_iommu_debugfs;
+static DEFINE_MUTEX(amd_iommu_debugfs_lock);
+
+#define	MAX_NAME_LEN	20
+
+void amd_iommu_debugfs_setup(struct amd_iommu *iommu)
+{
+	char name[MAX_NAME_LEN + 1];
+	struct dentry *d_top;
+
+	if (!debugfs_initialized())
+		return;
+
+	mutex_lock(&amd_iommu_debugfs_lock);
+	if (!amd_iommu_debugfs) {
+		d_top = iommu_debugfs_setup();
+		if (d_top)
+			amd_iommu_debugfs = debugfs_create_dir("amd", d_top);
+	}
+	mutex_unlock(&amd_iommu_debugfs_lock);
+	if (amd_iommu_debugfs) {
+		snprintf(name, MAX_NAME_LEN, "iommu%02d", iommu->index);
+		iommu->debugfs = debugfs_create_dir(name,
+						    amd_iommu_debugfs);
+		if (!iommu->debugfs) {
+			debugfs_remove_recursive(amd_iommu_debugfs);
+			amd_iommu_debugfs = NULL;
+		}
+	}
+}
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 6fe2d0346073..43856c7f4ea1 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -89,6 +89,7 @@
 #define ACPI_DEVFLAG_ATSDIS             0x10000000
 
 #define LOOP_TIMEOUT	100000
+
 /*
  * ACPI table definitions
  *
@@ -2720,6 +2721,7 @@ int __init amd_iommu_enable_faulting(void)
  */
 static int __init amd_iommu_init(void)
 {
+	struct amd_iommu *iommu;
 	int ret;
 
 	ret = iommu_go_to_state(IOMMU_INITIALIZED);
@@ -2729,14 +2731,15 @@ static int __init amd_iommu_init(void)
 			disable_iommus();
 			free_iommu_resources();
 		} else {
-			struct amd_iommu *iommu;
-
 			uninit_device_table_dma();
 			for_each_iommu(iommu)
 				iommu_flush_all_caches(iommu);
 		}
 	}
 
+	for_each_iommu(iommu)
+		amd_iommu_debugfs_setup(iommu);
+
 	return ret;
 }
 
diff --git a/drivers/iommu/amd_iommu_proto.h b/drivers/iommu/amd_iommu_proto.h
index 640c286a0ab9..1cfaae28c2cd 100644
--- a/drivers/iommu/amd_iommu_proto.h
+++ b/drivers/iommu/amd_iommu_proto.h
@@ -33,6 +33,12 @@ extern void amd_iommu_uninit_devices(void);
 extern void amd_iommu_init_notifier(void);
 extern int amd_iommu_init_api(void);
 
+#ifdef CONFIG_IOMMU_DEBUG
+void amd_iommu_debugfs_setup(struct amd_iommu *iommu);
+#else
+static inline void amd_iommu_debugfs_setup(struct amd_iommu *iommu) {}
+#endif
+
 /* Needed for interrupt remapping */
 extern int amd_iommu_prepare(void);
 extern int amd_iommu_enable(void);
@@ -58,7 +64,7 @@ extern int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, int pasid);
 extern struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev);
 
 #ifdef CONFIG_IRQ_REMAP
-extern int amd_iommu_create_irq_domain(struct amd_iommu *iommu);
+int amd_iommu_create_irq_domain(struct amd_iommu *iommu);
 #else
 static inline int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
 {
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index f6b24c7d8b70..43c52797810e 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -591,6 +591,9 @@ struct amd_iommu {
 
 	u32 flags;
 	volatile u64 __aligned(8) cmd_sem;
+
+	/* DebugFS Info */
+	struct dentry *debugfs;
 };
 
 static inline struct amd_iommu *dev_to_amd_iommu(struct device *dev)

^ permalink raw reply related	[flat|nested] 6+ messages in thread
* Re: [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU
  2018-04-04 18:55 ` [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU Gary R Hook
@ 2018-04-05  8:12   ` kbuild test robot
  2018-04-05 19:57   ` kbuild test robot
  2018-04-05 20:00   ` Tom Lendacky
  2 siblings, 0 replies; 6+ messages in thread
From: kbuild test robot @ 2018-04-05  8:12 UTC (permalink / raw)
  To: Gary R Hook; +Cc: kbuild-all, iommu, joro, linux-kernel

[-- Attachment #1: Type: text/plain, Size: 1819 bytes --]

Hi Gary,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on iommu/next]
[also build test ERROR on v4.16 next-20180404]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Gary-R-Hook/iommu-Enable-debugfs-exposure-of-the-IOMMU/20180405-151608
base:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next
config: x86_64-randconfig-x002-201813 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   drivers//iommu/amd_iommu_debugfs.c: In function 'amd_iommu_debugfs_setup':
>> drivers//iommu/amd_iommu_debugfs.c:31:11: error: implicit declaration of function 'iommu_debugfs_setup'; did you mean 'amd_iommu_debugfs_setup'? [-Werror=implicit-function-declaration]
      d_top = iommu_debugfs_setup();
              ^~~~~~~~~~~~~~~~~~~
              amd_iommu_debugfs_setup
>> drivers//iommu/amd_iommu_debugfs.c:31:9: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
      d_top = iommu_debugfs_setup();
            ^
   cc1: some warnings being treated as errors

vim +31 drivers//iommu/amd_iommu_debugfs.c

    20	
    21	void amd_iommu_debugfs_setup(struct amd_iommu *iommu)
    22	{
    23		char name[MAX_NAME_LEN + 1];
    24		struct dentry *d_top;
    25	
    26		if (!debugfs_initialized())
    27			return;
    28	
    29		mutex_lock(&amd_iommu_debugfs_lock);
    30		if (!amd_iommu_debugfs) {
  > 31			d_top = iommu_debugfs_setup();

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 27655 bytes --]

^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU
  2018-04-04 18:55 ` [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU Gary R Hook
  2018-04-05  8:12   ` kbuild test robot
@ 2018-04-05 19:57   ` kbuild test robot
  2018-04-05 20:00   ` Tom Lendacky
  2 siblings, 0 replies; 6+ messages in thread
From: kbuild test robot @ 2018-04-05 19:57 UTC (permalink / raw)
  To: Gary R Hook; +Cc: kbuild-all, iommu, joro, linux-kernel

[-- Attachment #1: Type: text/plain, Size: 1763 bytes --]

Hi Gary,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on iommu/next]
[also build test ERROR on v4.16 next-20180405]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Gary-R-Hook/iommu-Enable-debugfs-exposure-of-the-IOMMU/20180405-151608
base:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next
config: x86_64-randconfig-s2-04060234 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers//iommu/amd_iommu_debugfs.c: In function 'amd_iommu_debugfs_setup':
>> drivers//iommu/amd_iommu_debugfs.c:31:11: error: implicit declaration of function 'iommu_debugfs_setup' [-Werror=implicit-function-declaration]
      d_top = iommu_debugfs_setup();
              ^~~~~~~~~~~~~~~~~~~
   drivers//iommu/amd_iommu_debugfs.c:31:9: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
      d_top = iommu_debugfs_setup();
            ^
   cc1: some warnings being treated as errors

vim +/iommu_debugfs_setup +31 drivers//iommu/amd_iommu_debugfs.c

    20	
    21	void amd_iommu_debugfs_setup(struct amd_iommu *iommu)
    22	{
    23		char name[MAX_NAME_LEN + 1];
    24		struct dentry *d_top;
    25	
    26		if (!debugfs_initialized())
    27			return;
    28	
    29		mutex_lock(&amd_iommu_debugfs_lock);
    30		if (!amd_iommu_debugfs) {
  > 31			d_top = iommu_debugfs_setup();

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 28736 bytes --]

^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU
  2018-04-04 18:55 ` [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU Gary R Hook
  2018-04-05  8:12   ` kbuild test robot
  2018-04-05 19:57   ` kbuild test robot
@ 2018-04-05 20:00   ` Tom Lendacky
  2 siblings, 0 replies; 6+ messages in thread
From: Tom Lendacky @ 2018-04-05 20:00 UTC (permalink / raw)
  To: Gary R Hook, iommu; +Cc: joro, linux-kernel

On 4/4/2018 1:55 PM, Gary R Hook wrote:
> Implement a skeleton framework for debugfs support in the
> AMD IOMMU.
> 
> 
> Signed-off-by: Gary R Hook <gary.hook@amd.com>
> ---
>  drivers/iommu/Makefile            |    1 +
>  drivers/iommu/amd_iommu_debugfs.c |   45 +++++++++++++++++++++++++++++++++++++
>  drivers/iommu/amd_iommu_init.c    |    7 ++++--
>  drivers/iommu/amd_iommu_proto.h   |    8 ++++++-
>  drivers/iommu/amd_iommu_types.h   |    3 ++
>  5 files changed, 61 insertions(+), 3 deletions(-)
>  create mode 100644 drivers/iommu/amd_iommu_debugfs.c
> 
> diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
> index 5eb1121d54b9..0ca250f626d9 100644
> --- a/drivers/iommu/Makefile
> +++ b/drivers/iommu/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_IOMMU_IOVA) += iova.o
>  obj-$(CONFIG_OF_IOMMU)	+= of_iommu.o
>  obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
>  obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
> +obj-$(CONFIG_IOMMU_DEBUG) += amd_iommu_debugfs.o
>  obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
>  obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
>  obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
> diff --git a/drivers/iommu/amd_iommu_debugfs.c b/drivers/iommu/amd_iommu_debugfs.c
> new file mode 100644
> index 000000000000..282100a655b3
> --- /dev/null
> +++ b/drivers/iommu/amd_iommu_debugfs.c
> @@ -0,0 +1,45 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * AMD IOMMU driver
> + *
> + * Copyright (C) 2018 Advanced Micro Devices, Inc.
> + *
> + * Author: Gary R Hook <gary.hook@amd.com>
> + */
> +
> +#include <linux/debugfs.h>
> +#include <linux/iommu.h>
> +#include <linux/pci.h>
> +#include "amd_iommu_proto.h"
> +#include "amd_iommu_types.h"
> +
> +static struct dentry *amd_iommu_debugfs;
> +static DEFINE_MUTEX(amd_iommu_debugfs_lock);
> +
> +#define	MAX_NAME_LEN	20
> +
> +void amd_iommu_debugfs_setup(struct amd_iommu *iommu)
> +{
> +	char name[MAX_NAME_LEN + 1];
> +	struct dentry *d_top;
> +
> +	if (!debugfs_initialized())
> +		return;
> +
> +	mutex_lock(&amd_iommu_debugfs_lock);
> +	if (!amd_iommu_debugfs) {
> +		d_top = iommu_debugfs_setup();
> +		if (d_top)
> +			amd_iommu_debugfs = debugfs_create_dir("amd", d_top);
> +	}
> +	mutex_unlock(&amd_iommu_debugfs_lock);
> +	if (amd_iommu_debugfs) {
> +		snprintf(name, MAX_NAME_LEN, "iommu%02d", iommu->index);
> +		iommu->debugfs = debugfs_create_dir(name,
> +						    amd_iommu_debugfs);
> +		if (!iommu->debugfs) {
> +			debugfs_remove_recursive(amd_iommu_debugfs);
> +			amd_iommu_debugfs = NULL;
> +		}
> +	}
> +}
> diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
> index 6fe2d0346073..43856c7f4ea1 100644
> --- a/drivers/iommu/amd_iommu_init.c
> +++ b/drivers/iommu/amd_iommu_init.c
> @@ -89,6 +89,7 @@
>  #define ACPI_DEVFLAG_ATSDIS             0x10000000
>  
>  #define LOOP_TIMEOUT	100000
> +

Spurious new line.

>  /*
>   * ACPI table definitions
>   *
> @@ -2720,6 +2721,7 @@ int __init amd_iommu_enable_faulting(void)
>   */
>  static int __init amd_iommu_init(void)
>  {
> +	struct amd_iommu *iommu;
>  	int ret;
>  
>  	ret = iommu_go_to_state(IOMMU_INITIALIZED);
> @@ -2729,14 +2731,15 @@ static int __init amd_iommu_init(void)
>  			disable_iommus();
>  			free_iommu_resources();
>  		} else {
> -			struct amd_iommu *iommu;
> -
>  			uninit_device_table_dma();
>  			for_each_iommu(iommu)
>  				iommu_flush_all_caches(iommu);
>  		}
>  	}
>  
> +	for_each_iommu(iommu)
> +		amd_iommu_debugfs_setup(iommu);
> +
>  	return ret;
>  }
>  
> diff --git a/drivers/iommu/amd_iommu_proto.h b/drivers/iommu/amd_iommu_proto.h
> index 640c286a0ab9..1cfaae28c2cd 100644
> --- a/drivers/iommu/amd_iommu_proto.h
> +++ b/drivers/iommu/amd_iommu_proto.h
> @@ -33,6 +33,12 @@ extern void amd_iommu_uninit_devices(void);
>  extern void amd_iommu_init_notifier(void);
>  extern int amd_iommu_init_api(void);
>  
> +#ifdef CONFIG_IOMMU_DEBUG
> +void amd_iommu_debugfs_setup(struct amd_iommu *iommu);
> +#else
> +static inline void amd_iommu_debugfs_setup(struct amd_iommu *iommu) {}
> +#endif
> +
>  /* Needed for interrupt remapping */
>  extern int amd_iommu_prepare(void);
>  extern int amd_iommu_enable(void);
> @@ -58,7 +64,7 @@ extern int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, int pasid);
>  extern struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev);
>  
>  #ifdef CONFIG_IRQ_REMAP
> -extern int amd_iommu_create_irq_domain(struct amd_iommu *iommu);
> +int amd_iommu_create_irq_domain(struct amd_iommu *iommu);

I don't think this change is required for the debugfs support.

Thanks,
Tom

>  #else
>  static inline int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
>  {
> diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
> index f6b24c7d8b70..43c52797810e 100644
> --- a/drivers/iommu/amd_iommu_types.h
> +++ b/drivers/iommu/amd_iommu_types.h
> @@ -591,6 +591,9 @@ struct amd_iommu {
>  
>  	u32 flags;
>  	volatile u64 __aligned(8) cmd_sem;
> +
> +	/* DebugFS Info */
> +	struct dentry *debugfs;
>  };
>  
>  static inline struct amd_iommu *dev_to_amd_iommu(struct device *dev)
> 

^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-04-05 20:00 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-04-04 18:54 [PATCH v2 0/2] Base enablement of IOMMU debugfs support Gary R Hook
2018-04-04 18:54 ` [PATCH v2 1/2] iommu - Enable debugfs exposure of the IOMMU Gary R Hook
2018-04-04 18:55 ` [PATCH v2 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU Gary R Hook
2018-04-05  8:12   ` kbuild test robot
2018-04-05 19:57   ` kbuild test robot
2018-04-05 20:00   ` Tom Lendacky

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