lkml.org 
[lkml]   [2017]   [Dec]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 4/5] iommu/vt-d: Add debugfs support to show Pasid table contents
Date
From: Gayatri Kammela <gayatri.kammela@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 dmar0: Extended Root Table Addr:402b9e800
Extended Root table entries:
Bus 0 L: 402150001 H: 0
Lower Context table entries for Bus: 0
[entry] DID :B :D .F Low High
[80] 0000:00:0a.00 40214fa05 102
Higher Context table entries for Bus: 0
[80] 0000:00:0a.00 40260000c 0
Pasid Table Addr : ffff8e2d42600000
Pasid table entries for domain 0:
[Entry] Contents
[0] 12c409801

Cc: Sohil Mehta <sohil.mehta@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com>
---

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 c45c0f6..c751d53 100644
--- a/drivers/iommu/intel-iommu-debug.c
+++ b/drivers/iommu/intel-iommu-debug.c
@@ -46,6 +46,36 @@ static const struct file_operations __name ## _fops = \
.owner = THIS_MODULE, \
}

+#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)) {
+ pasid_size = intel_iommu_get_pts(iommu);
+ seq_printf(m, "Pasid Table Addr : %p\n", iommu->pasid_table);
+
+ if (iommu->pasid_table) {
+ 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 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, bool new_ext)
{
@@ -79,6 +109,7 @@ static void ctx_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu,
}
}
}
+ 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
\
 
 \ /
  Last update: 2017-12-19 22:09    [W:0.085 / U:2.400 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site