From: Gayatri Kammela
IOMMU internals states such as root and context can be exported 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 .FLow High
[80]:00:0a.00 40214fa05 102
Higher Context table entries for Bus: 0
[80]:00:0a.00 4026c 0
IOMMU dmar1:Root Table Addr:4558a3000
Root tbl entries:
Bus 0 L: 4558aa001 H: 0
Context table entries for Bus: 0
[entry] DID :B :D .FLow High
[160] :00:14.00 4558a9001 102
[184] :00:17.00 400eac001 302
[248] :00:1f.00 4558af001 202
[251] :00:1f.03 40070e001 502
[254] :00:1f.06 4467c9001 602
Root tbl entries:
Bus 1 L: 3fc8c2001 H: 0
Context table entries for Bus: 1
[entry] DID :B :D .FLow High
[0] :01:00.00 3fc8c3001 402
Cc: Sohil Mehta
Cc: Fenghua Yu
Cc: Ashok Raj
Signed-off-by: Jacob Pan
Signed-off-by: Gayatri Kammela
---
v4: Remove the unused function parameter
Fix checkpatch.pl warnings
Remove error reporting for debugfs_create_file function
Fix unnecessary reprogramming of the context entries
Simplify and merge the show context and extended context patch into one
Remove redundant IOMMU null check under for_each_active_iommu
v3: Add a macro for seq file operations
Change the intel_iommu_ctx file name to dmar_translation_struct
v2: No change
drivers/iommu/Makefile| 1 +
drivers/iommu/intel-iommu-debug.c | 146 ++
drivers/iommu/intel-iommu.c | 4 ++
3 files changed, 151 insertions(+)
create mode 100644 drivers/iommu/intel-iommu-debug.c
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 1fb6958..fdbaf46 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
obj-$(CONFIG_DMAR_TABLE) += dmar.o
obj-$(CONFIG_INTEL_IOMMU) += intel-iommu.o
+obj-$(CONFIG_INTEL_IOMMU_DEBUG) += intel-iommu-debug.o
obj-$(CONFIG_INTEL_IOMMU_SVM) += intel-svm.o
obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
diff --git a/drivers/iommu/intel-iommu-debug.c
b/drivers/iommu/intel-iommu-debug.c
new file mode 100644
index 000..fa458904
--- /dev/null
+++ b/drivers/iommu/intel-iommu-debug.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright © 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * Authors: Gayatri Kammela
+ * Jacob Pan
+ *
+ */
+
+#define pr_fmt(fmt) "INTEL_IOMMU: " fmt
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+#include "irq_remapping.h"
+
+#define TOTAL_BUS_NR (256) /* full bus range 256 */
+#define DEFINE_SHOW_ATTRIBUTE(__name) \
+static int __name ## _open(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, __name ## _show, inode->i_private);\
+} \
+static const struct file_operations __name ## _fops = \
+{ \
+ .open = __name ## _open, \
+ .read = seq_read, \
+ .llseek = seq_lseek,\
+ .release= single_release, \
+ .owner = THIS_MODULE, \
+}
+
+static void ctx_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu,
+ int bus, bool ext, bool new_ext)
+{
+ struct context_entry *context;
+ int ctx;
+ unsigned long flags;
+
+ seq_printf(m, "%s Context table entries for Bus: %d\n",
+ ext ? "Lower" : "", bus);
+ seq_puts(m, "[entry]\tDID :B :D .F\tLow\t\tHigh\n");
+
+ spin_lock_irqsave(>lock, flags);
+
+ /* Publish either context entries or extended contenxt entries */
+ for (ctx = 0; ctx < (ext ? 128 : 256); ctx++) {
+ context =