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authorSohil Mehta <sohil.mehta@intel.com>2018-09-11 17:11:41 -0700
committerJoerg Roedel <jroedel@suse.de>2018-09-25 14:33:44 +0200
commit18f99c9b9dec15bc088d9db239f68e5c80415304 (patch)
treebd34e2e593adc288ed80b2b5f023f096768938d9 /drivers/iommu
parenta6d268c619d6765322f2fbdd1d7d2769ebc04cb2 (diff)
downloadlinux-18f99c9b9dec15bc088d9db239f68e5c80415304.tar.bz2
iommu/vt-d: Add debugfs support to show context internals
Export Intel IOMMU DMA remapping internal states, such as root and context table entries in debugfs. Example of such dump in Kabylake: /sys/kernel/debug/iommu/intel/dmar_translation_struct IOMMU dmar0: Root Table Address:45699c000 Root Table Entries: Bus: 0 H: 0 L: 45699f001 Context Table Entries for Bus: 0 Entry B:D.F High Low 16 00:02.0 102 45699e005 IOMMU dmar1: Root Table Address:45699d000 Root Table Entries: Bus: 0 H: 0 L: 45644f001 Context Table Entries for Bus: 0 Entry B:D.F High Low 160 00:14.0 102 45644e001 184 00:17.0 302 456310001 248 00:1f.0 202 4564bf001 Cc: Lu Baolu <baolu.lu@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Ashok Raj <ashok.raj@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Co-Developed-by: Gayatri Kammela <gayatri.kammela@intel.com> Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Sohil Mehta <sohil.mehta@intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel-iommu-debugfs.c65
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);