1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/iommu/intel-iommu-debugfs.c b/drivers/iommu/intel-iommu-debugfs.c
index 2becbd78620f..7fabf9b1c2dc 100644
--- a/drivers/iommu/intel-iommu-debugfs.c
+++ b/drivers/iommu/intel-iommu-debugfs.c
@@ -131,6 +131,69 @@ out:
 }
 DEFINE_SHOW_ATTRIBUTE(iommu_regset);
 
+static void ctx_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu,
+                               int bus)
+{
+        struct context_entry *context;
+        int devfn;
+
+        seq_printf(m, " Context Table Entries for Bus: %d\n", bus);
+        seq_puts(m, "  Entry\tB:D.F\tHigh\tLow\n");
+
+        for (devfn = 0; devfn < 256; devfn++) {
+                context = iommu_context_addr(iommu, bus, devfn, 0);
+                if (!context)
+                        return;
+
+                if (!context_present(context))
+                        continue;
+
+                seq_printf(m, "  %-5d\t%02x:%02x.%x\t%-6llx\t%llx\n", devfn,
+                           bus, PCI_SLOT(devfn), PCI_FUNC(devfn),
+                           context[0].hi, context[0].lo);
+        }
+}
+
+static void root_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu)
+{
+        unsigned long flags;
+        int bus;
+
+        spin_lock_irqsave(&iommu->lock, flags);
+        seq_printf(m, "IOMMU %s: Root Table Address:%llx\n", iommu->name,
+                   (u64)virt_to_phys(iommu->root_entry));
+        seq_puts(m, "Root Table Entries:\n");
+
+        for (bus = 0; bus < 256; bus++) {
+                if (!(iommu->root_entry[bus].lo & 1))
+                        continue;
+
+                seq_printf(m, " Bus: %d H: %llx L: %llx\n", bus,
+                           iommu->root_entry[bus].hi,
+                           iommu->root_entry[bus].lo);
+
+                ctx_tbl_entry_show(m, iommu, bus);
+                seq_putc(m, '\n');
+        }
+        spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+static int dmar_translation_struct_show(struct seq_file *m, void *unused)
+{
+        struct dmar_drhd_unit *drhd;
+        struct intel_iommu *iommu;
+
+        rcu_read_lock();
+        for_each_active_iommu(iommu, drhd) {
+                root_tbl_entry_show(m, iommu);
+                seq_putc(m, '\n');
+        }
+        rcu_read_unlock();
+
+        return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(dmar_translation_struct);
+
 #ifdef CONFIG_IRQ_REMAP
 static void ir_tbl_remap_entry_show(struct seq_file *m,
                                     struct intel_iommu *iommu)
@@ -242,6 +305,8 @@ void __init intel_iommu_debugfs_init(void)
 
         debugfs_create_file("iommu_regset", 0444, intel_iommu_debug, NULL,
                             &iommu_regset_fops);
+        debugfs_create_file("dmar_translation_struct", 0444, intel_iommu_debug,
+                            NULL, &dmar_translation_struct_fops);
 #ifdef CONFIG_IRQ_REMAP
         debugfs_create_file("ir_translation_struct", 0444, intel_iommu_debug,
                             NULL, &ir_translation_struct_fops);