From: Gayatri Kammela <gayatri.kamm...@intel.com>
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/dmar_translation_struct
IOMMU dmar1: Extended Root Table Address:4071d3800
Extended Root Table Entries:
Bus 0 L: 4071d7001 H: 0
Lower Context Table Entries for Bus: 0
[entry] Device B:D.F Low High
[16] 0000:00:02.0 4071d6005 102
Higher Context Table Entries for Bus: 0
[16] 0000:00:02.0 0 0
Pasid Table Address: 00000000746cb0af
Pasid Table Entries for domain 0:
[Entry] Contents
[0] 12c409801
Cc: Fenghua Yu <fenghua...@intel.com>
Cc: Jacob Pan <jacob.jun....@linux.intel.com>
Cc: Ashok Raj <ashok....@intel.com>
Co-Developed-by: Sohil Mehta <sohil.me...@intel.com>
Signed-off-by: Sohil Mehta <sohil.me...@intel.com>
Signed-off-by: Gayatri Kammela <gayatri.kamm...@intel.com>
---
v7: Improve code indentation and formatting
v6: No change
v5: No change
v4: Remove the unused function parameter
Fix checkpatch.pl warnings
v3: No change
v2: Fix seq_printf formatting
drivers/iommu/intel-iommu-debug.c | 31 +++++++++++++++++++++++++++++++
drivers/iommu/intel-svm.c | 8 --------
include/linux/intel-svm.h | 8 ++++++++
3 files changed, 39 insertions(+), 8 deletions(-)
diff --git a/drivers/iommu/intel-iommu-debug.c
b/drivers/iommu/intel-iommu-debug.c
index 38651ad..a9a99aa 100644
--- a/drivers/iommu/intel-iommu-debug.c
+++ b/drivers/iommu/intel-iommu-debug.c
@@ -81,6 +81,36 @@ static const struct iommu_regset iommu_regs[] = {
IOMMU_REGSET_ENTRY(MTRRDEF)
};
+#ifdef CONFIG_INTEL_IOMMU_SVM
+static void pasid_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu)
+{
+ int pasid_size = 0, i;
+
+ if (!ecap_pasid(iommu->ecap))
+ return;
+
+ pasid_size = intel_iommu_get_pts(iommu);
+ seq_printf(m, "Pasid Table Address: %p\n", iommu->pasid_table);
+
+ if (!iommu->pasid_table)
+ return;
+
+ seq_printf(m, "Pasid Table Entries for domain %d:\n", iommu->segment);
+ seq_puts(m, "[Entry]\t\tContents\n");
+
+ /* 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\t%04llx\n", i, iommu->pasid_table[i].val);
+ }
+}
+#else /* CONFIG_INTEL_IOMMU_SVM */
+static inline void
+pasid_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu) {}
+#endif /* CONFIG_INTEL_IOMMU_SVM */
+
static void ctx_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu,
int bus, bool ext)
{
@@ -116,6 +146,7 @@ static void ctx_tbl_entry_show(struct seq_file *m, struct
intel_iommu *iommu,
iommu->segment, bus, PCI_SLOT(ctx), PCI_FUNC(ctx),
context[1].lo, context[1].hi);
}
+ pasid_tbl_entry_show(m, iommu);
out:
spin_unlock_irqrestore(&iommu->lock, flags);
}
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index ed1cf7c..c646724 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
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