[PATCH 5/6] iommu/vt-d: Add debugfs extension to show Pasid table contents

[Sohil Mehta]

From: Gayatri Kammela 

Debugfs extension to dump the internals such as pasid table entries for
each IOMMU to the userspace.

Example of such dump in Kabylake:

root@OTC-KBLH-01:~# cat /sys/kernel/debug/intel_iommu/intel_iommu_ctx

IOMMU dmar0: Extended Root Table Addr:4310c4800
Extended Root tbl entries:
Bus 0 L: 3ff5a8001 H: 0
Lower Context table entries for Bus: 0
[entry] DID :B :D .FLow High
[80]:00:0a.00   3ff5a9a05   102
Higher Context tbl entries for Bus: 0
[80]:00:0a.00   4016c   72514000
Pasid Table Addr : 8db2c160
Pasid table entries for domain: 
[Entry] Contents
[0] 26a609801

Cc: Sohil Mehta 
Cc: Fenghua Yu 
Cc: Jacob Pan 
Cc: Ashok Raj 
Signed-off-by: Gayatri Kammela 
---
 drivers/iommu/intel-iommu-debug.c | 33 +
 drivers/iommu/intel-svm.c |  8 
 include/linux/intel-svm.h |  8 
 3 files changed, 41 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/intel-iommu-debug.c 
b/drivers/iommu/intel-iommu-debug.c
index 295cadc..2de4f1b 100644
--- a/drivers/iommu/intel-iommu-debug.c
+++ b/drivers/iommu/intel-iommu-debug.c
@@ -34,6 +34,32 @@
 #define TOTAL_BUS_NR (256) /* full bus range 256 */
 
 #ifdef CONFIG_INTEL_IOMMU_SVM
+static void pasid_tbl_entry_show(struct seq_file *m, void *unused,
+struct intel_iommu *iommu)
+{
+   int pasid_size = 0, i;
+
+   if (ecap_pasid(iommu->ecap)) {
+   pasid_size = intel_iommu_get_pts(iommu);
+   seq_printf(m, "Pasid Table Addr : %llx\n", (unsigned long long)
+  iommu->pasid_table);
+
+   if (iommu->pasid_table) {
+   seq_printf(m, "Pasid table entries for domain %d:\n",
+  iommu->segment);
+   seq_printf(m, "%2s\t\t%4s\n", "[Entry]", "Contents");
+
+   /* Publish the pasid table entries here */
+   for (i = 0; i < pasid_size; i++) {
+   if (!iommu->pasid_table[i].val)
+   continue;
+   seq_printf(m, "[%d]\t%04llx\n", i,
+  iommu->pasid_table[i].val);
+   }
+   }
+   }
+}
+
 static void ext_ctx_tbl_entry_show(struct seq_file *m, void *unused,
   struct intel_iommu *iommu, int bus, int ctx,
   struct context_entry *context, bool new_ext)
@@ -57,6 +83,12 @@ static void ext_ctx_tbl_entry_show(struct seq_file *m, void 
*unused,
}
 }
 #else /* CONFIG_INTEL_IOMMU_SVM */
+static void pasid_tbl_entry_show(struct seq_file *m, void *unused,
+struct intel_iommu *iommu)
+{
+   return;
+}
+
 static void ext_ctx_tbl_entry_show(struct seq_file *m, void *unused,
   struct intel_iommu *iommu, int bus, int ctx,
   struct context_entry *context, bool new_ext)
@@ -93,6 +125,7 @@ static void ctx_tbl_entry_show(struct seq_file *m, void 
*unused,
   context, new_ext);
}
}
+   pasid_tbl_entry_show(m, unused, iommu);
 out:
spin_unlock_irqrestore(>lock, flags);
 }
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index f6697e5..2003f23 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -28,14 +28,6 @@
 
 static irqreturn_t prq_event_thread(int irq, void *d);
 
-struct pasid_entry {
-   u64 val;
-};
-
-struct pasid_state_entry {
-   u64 val;
-};
-
 int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
 {
struct page *pages;
diff --git a/include/linux/intel-svm.h b/include/linux/intel-svm.h
index 733eaf9..a8abad6 100644
--- a/include/linux/intel-svm.h
+++ b/include/linux/intel-svm.h
@@ -18,6 +18,14 @@
 
 struct device;
 
+struct pasid_entry {
+   u64 val;
+};
+
+struct pasid_state_entry {
+   u64 val;
+};
+
 struct svm_dev_ops {
void (*fault_cb)(struct device *dev, int pasid, u64 address,
 u32 private, int rwxp, int response);
-- 
2.7.4

[PATCH 5/6] iommu/vt-d: Add debugfs extension to show Pasid table contents

[Sohil Mehta]

From: Gayatri Kammela 

Debugfs extension to dump the internals such as pasid table entries for
each IOMMU to the userspace.

Example of such dump in Kabylake:

root@OTC-KBLH-01:~# cat /sys/kernel/debug/intel_iommu/intel_iommu_ctx

IOMMU dmar0: Extended Root Table Addr:4310c4800
Extended Root tbl entries:
Bus 0 L: 3ff5a8001 H: 0
Lower Context table entries for Bus: 0
[entry] DID :B :D .FLow High
[80]:00:0a.00   3ff5a9a05   102
Higher Context tbl entries for Bus: 0
[80]:00:0a.00   4016c   72514000
Pasid Table Addr : 8db2c160
Pasid table entries for domain: 
[Entry] Contents
[0] 26a609801

Cc: Sohil Mehta 
Cc: Fenghua Yu 
Cc: Jacob Pan 
Cc: Ashok Raj 
Signed-off-by: Gayatri Kammela 
---
 drivers/iommu/intel-iommu-debug.c | 33 +
 drivers/iommu/intel-svm.c |  8 
 include/linux/intel-svm.h |  8 
 3 files changed, 41 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/intel-iommu-debug.c 
b/drivers/iommu/intel-iommu-debug.c
index 295cadc..2de4f1b 100644
--- a/drivers/iommu/intel-iommu-debug.c
+++ b/drivers/iommu/intel-iommu-debug.c
@@ -34,6 +34,32 @@
 #define TOTAL_BUS_NR (256) /* full bus range 256 */
 
 #ifdef CONFIG_INTEL_IOMMU_SVM
+static void pasid_tbl_entry_show(struct seq_file *m, void *unused,
+struct intel_iommu *iommu)
+{
+   int pasid_size = 0, i;
+
+   if (ecap_pasid(iommu->ecap)) {
+   pasid_size = intel_iommu_get_pts(iommu);
+   seq_printf(m, "Pasid Table Addr : %llx\n", (unsigned long long)
+  iommu->pasid_table);
+
+   if (iommu->pasid_table) {
+   seq_printf(m, "Pasid table entries for domain %d:\n",
+  iommu->segment);
+   seq_printf(m, "%2s\t\t%4s\n", "[Entry]", "Contents");
+
+   /* Publish the pasid table entries here */
+   for (i = 0; i < pasid_size; i++) {
+   if (!iommu->pasid_table[i].val)
+   continue;
+   seq_printf(m, "[%d]\t%04llx\n", i,
+  iommu->pasid_table[i].val);
+   }
+   }
+   }
+}
+
 static void ext_ctx_tbl_entry_show(struct seq_file *m, void *unused,
   struct intel_iommu *iommu, int bus, int ctx,
   struct context_entry *context, bool new_ext)
@@ -57,6 +83,12 @@ static void ext_ctx_tbl_entry_show(struct seq_file *m, void 
*unused,
}
 }
 #else /* CONFIG_INTEL_IOMMU_SVM */
+static void pasid_tbl_entry_show(struct seq_file *m, void *unused,
+struct intel_iommu *iommu)
+{
+   return;
+}
+
 static void ext_ctx_tbl_entry_show(struct seq_file *m, void *unused,
   struct intel_iommu *iommu, int bus, int ctx,
   struct context_entry *context, bool new_ext)
@@ -93,6 +125,7 @@ static void ctx_tbl_entry_show(struct seq_file *m, void 
*unused,
   context, new_ext);
}
}
+   pasid_tbl_entry_show(m, unused, iommu);
 out:
spin_unlock_irqrestore(>lock, flags);
 }
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index f6697e5..2003f23 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -28,14 +28,6 @@
 
 static irqreturn_t prq_event_thread(int irq, void *d);
 
-struct pasid_entry {
-   u64 val;
-};
-
-struct pasid_state_entry {
-   u64 val;
-};
-
 int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
 {
struct page *pages;
diff --git a/include/linux/intel-svm.h b/include/linux/intel-svm.h
index 733eaf9..a8abad6 100644
--- a/include/linux/intel-svm.h
+++ b/include/linux/intel-svm.h
@@ -18,6 +18,14 @@
 
 struct device;
 
+struct pasid_entry {
+   u64 val;
+};
+
+struct pasid_state_entry {
+   u64 val;
+};
+
 struct svm_dev_ops {
void (*fault_cb)(struct device *dev, int pasid, u64 address,
 u32 private, int rwxp, int response);
-- 
2.7.4