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Subject[PATCH 3/6] iommu/vt-d: Add Intel IOMMU debugfs to show extended context internals
Date
From: Gayatri Kammela <gayatri.kammela@intel.com>

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

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

IOMMU dmar1: Extended Root Table Addr:4558a1800
Extended Root tbl entries:
Bus 0 L: 4558a6001 H: 0
Lower Context table entries for Bus: 0
[entry] DID :B :D .F Low High
[16] 0000:00:02.00 4558a5005 102
Higher Context tbl entries for Bus: 0
[16] 0000:00:02.00 401b0000c 401400000

IOMMU dmar0: Extended Root Table Addr:4558a2800
Extended Root tbl entries:
Bus 0 L: 4016f4001 H: 0
Lower Context table entries for Bus: 0
[entry] DID :B :D .F Low High
[80] 0000:00:0a.00 4016f3a05 102
Higher Context tbl entries for Bus: 0
[80] 0000:00:0a.00 40150000c 671b80000000

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>
---
drivers/iommu/intel-iommu-debug.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/drivers/iommu/intel-iommu-debug.c b/drivers/iommu/intel-iommu-debug.c
index 90872ed..ef46820 100644
--- a/drivers/iommu/intel-iommu-debug.c
+++ b/drivers/iommu/intel-iommu-debug.c
@@ -33,6 +33,38 @@

#define TOTAL_BUS_NR (256) /* full bus range 256 */

+#ifdef CONFIG_INTEL_IOMMU_SVM
+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)
+{
+ u64 ctx_lo;
+
+ if (new_ext) {
+ seq_printf(m, "Higher Context tbl entries for Bus: %d\n", bus);
+ ctx_lo = context[0].lo;
+
+ if (!(ctx_lo & CONTEXT_PASIDE)) {
+ context[1].hi = (u64)virt_to_phys(
+ iommu->pasid_state_table);
+ context[1].lo = (u64)virt_to_phys(iommu->pasid_table) |
+ intel_iommu_get_pts(iommu);
+ }
+
+ seq_printf(m, "[%d]\t%04x:%02x:%02x.%02x\t%llx\t%llx\n", ctx,
+ iommu->segment, bus, PCI_SLOT(ctx), PCI_FUNC(ctx),
+ context[1].lo, context[1].hi);
+ }
+}
+#else /* CONFIG_INTEL_IOMMU_SVM */
+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)
+{
+ return;
+}
+#endif /* CONFIG_INTEL_IOMMU_SVM */
+
static void ctx_tbl_entry_show(struct seq_file *m, void *unused,
struct intel_iommu *iommu, int bus, bool ext,
bool new_ext)
@@ -56,6 +88,9 @@ static void ctx_tbl_entry_show(struct seq_file *m, void *unused,
seq_printf(m, "[%d]\t%04x:%02x:%02x.%02x\t%llx\t%llx\n",
ctx, iommu->segment, bus, PCI_SLOT(ctx),
PCI_FUNC(ctx), context[0].lo, context[0].hi);
+
+ ext_ctx_tbl_entry_show(m, unused, iommu, bus, ctx,
+ context, new_ext);
}
}
out:
--
2.7.4
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