Debugfs extension for Intel IOMMU to dump Interrupt remapping table
entries for Interrupt remapping and Interrupt posting.
The file /sys/kernel/debug/intel_iommu/ir_translation_struct provides
detailed information, such as Index, Source Id, Destination Id, Vector
and the raw values for entries with the present bit set, in the format
shown.
Remapped Interrupt supported on IOMMU: dmar5
IR table address:93e09d54c310
---
Index SID Dest_ID Vct Raw_value_high Raw_value_low
1 3a00 0600 2c 00043a00 062c0009
1114301 0900 a2 00044301 09a20009
Posted Interrupt supported on IOMMU: dmar5
IR table address:93e09d54c310
Index SID PDA_high PDA_low Vct Raw_value_high Raw_value_low
4 4300 0010 40c7c880 41 00144300 40c7c88000418001
5 4300 0010 40c7c880 51 00144300 40c7c88000518001
Cc: Gayatri Kammela
Cc: Jacob Pan
Cc: Fenghua Yu
Cc: Ashok Raj
Signed-off-by: Sohil Mehta
---
v5: Fix seq_puts formatting and remove leading '\n's
v4: Remove the unused function parameter
Fix checkpatch.pl warnings
Remove error reporting for debugfs_create_file function
Remove redundant IOMMU null check under for_each_active_iommu
v3: Use a macro for seq file operations
Change the intel_iommu_interrupt_remap file name to ir_translation_struct
v2: Handle the case when IR is not enabled. Fix seq_printf formatting
drivers/iommu/intel-iommu-debug.c | 98 +++
1 file changed, 98 insertions(+)
diff --git a/drivers/iommu/intel-iommu-debug.c
b/drivers/iommu/intel-iommu-debug.c
index 218d767..5019835 100644
--- a/drivers/iommu/intel-iommu-debug.c
+++ b/drivers/iommu/intel-iommu-debug.c
@@ -4,6 +4,7 @@
*
* Authors: Gayatri Kammela
* Jacob Pan
+ * Sohil Mehta
*
*/
@@ -230,6 +231,98 @@ static int iommu_regset_show(struct seq_file *m, void
*unused)
DEFINE_SHOW_ATTRIBUTE(iommu_regset);
+#ifdef CONFIG_IRQ_REMAP
+static void ir_tbl_remap_entry_show(struct seq_file *m,
+ struct intel_iommu *iommu)
+{
+ int idx;
+ struct irte *ri_entry;
+
+ /* Print the header only once */
+ seq_puts(m, " Index SID Dest_ID Vct Raw_value_high
Raw_value_low\n");
+
+ for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) {
+ ri_entry = &iommu->ir_table->base[idx];
+ if (!ri_entry->present || ri_entry->p_pst)
+ continue;
+ seq_printf(m, " %d\t%04x %08x %02x %016llx %016llx\n", idx,
+ ri_entry->sid, ri_entry->dest_id, ri_entry->vector,
+ ri_entry->high, ri_entry->low);
+ }
+}
+
+static void ir_tbl_posted_entry_show(struct seq_file *m,
+struct intel_iommu *iommu)
+{
+ int idx;
+ struct irte *pi_entry;
+
+ /* Print the header only once */
+ seq_puts(m, " Index SID PDA_high PDA_low Vct Raw_value_high
Raw_value_low\n");
+
+ for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) {
+ pi_entry = &iommu->ir_table->base[idx];
+ if (!pi_entry->present || !pi_entry->p_pst)
+ continue;
+ seq_printf(m, " %d\t%04x %08x %08x %02x %016llx %016llx\n",
+ idx, pi_entry->sid, pi_entry->pda_h,
+ (pi_entry->pda_l)<<6, pi_entry->vector,
+ pi_entry->high, pi_entry->low);
+ }
+}
+
+/*
+ * For active IOMMUs go through the Interrupt remapping
+ * table and print valid entries in a table format for
+ * Remapped and Posted Interrupts.
+ */
+static int ir_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) {
+ if (!ecap_ir_support(iommu->ecap))
+ continue;
+
+ seq_printf(m, "Remapped Interrupt supported on IOMMU: %s\n"
+ " IR table address:%p\n", iommu->name,
+ iommu->ir_table);
+ seq_puts(m,
"---\n");
+
+ if (iommu->ir_table)
+ ir_tbl_remap_entry_show(m, iommu);
+ else
+ seq_puts(m, "Interrupt Remapping is not enabled\n");
+ seq_puts(m, "\n");
+ }
+
+ seq_puts(m, "\t\t\t\t\t\t\t\n");
+
+ for_each_active_iommu(iommu, drhd) {
+ if (!cap_pi_support(iommu->cap))
+ continue;
+
+ seq_printf(m, "Posted Interrupt supported on IOMMU: %s\n"
+ " IR table address:%p\n",
