On 01/09/2018 09:48 PM, Sohil Mehta wrote:
From: Gayatri Kammela <gayatri.kamm...@intel.com>
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 .F Low High
[80] 0000:00:0a.00 40214fa05 102
Higher Context table entries for Bus: 0
[80] 0000:00:0a.00 40260000c 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 .F Low High
[160] 0000:00:14.00 4558a9001 102
[184] 0000:00:17.00 400eac001 302
[248] 0000:00:1f.00 4558af001 202
[251] 0000:00:1f.03 40070e001 502
[254] 0000:00:1f.06 4467c9001 602
Root tbl entries:
Bus 1 L: 3fc8c2001 H: 0
Context table entries for Bus: 1
[entry] DID :B :D .F Low High
[0] 0000:01:00.00 3fc8c3001 402
Cc: Sohil Mehta <sohil.me...@intel.com>
Cc: Fenghua Yu <fenghua...@intel.com>
Cc: Ashok Raj <ashok....@intel.com>
Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com>
Signed-off-by: Gayatri Kammela <gayatri.kamm...@intel.com>
---
v6: Change the order of includes to an alphabetical order
Change seq_printf formatting
v5: Change to a SPDX license tag
Fix seq_printf formatting
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 | 139 ++++++++++++++++++++++++++++++++++++++
drivers/iommu/intel-iommu.c | 4 ++
3 files changed, 144 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 0000000..d5b0eea
--- /dev/null
+++ b/drivers/iommu/intel-iommu-debug.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright © 2017 Intel Corporation.
+ *
+ * Authors: Gayatri Kammela <gayatri.kamm...@intel.com>
+ * Jacob Pan <jacob.jun....@linux.intel.com>
+ *
+ */
+
+#define pr_fmt(fmt) "INTEL_IOMMU: " fmt
+#include <linux/debugfs.h>
+#include <linux/dmar.h>
+#include <linux/err.h>
+#include <linux/intel-iommu.h>
+#include <linux/intel-svm.h>
+#include <linux/io.h>
+#include <linux/iommu.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+
+#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(&iommu->lock, flags);
+
+ /* Publish either context entries or extended contenxt entries */
^^^^^^^^ typo
