[PATCH v4 0/5] Add Intel IOMMU debugfs support

From: Sohil Mehta
Date: Tue Dec 19 2017 - 16:08:50 EST

Hi All,

This series aims to add debugfs support for Intel IOMMU. It exposes IOMMU
registers, internal context and dumps individual table entries to help debug
Intel IOMMUs.

The first patch does the ground work for the following patches by creating a
new Kconfig option - INTEL_IOMMU_DEBUG. It also reorganizes some Intel IOMMU
data structures. The next four patches add debugfs support for IOMMU context
internals, register contents, PASID internals, and Interrupt remapping in
that order. The information can be accessed in sysfs at


Changes since v3:
- Remove an unused function parameter from some of the functions
- Fix checkpatch.pl warnings
- Remove error reporting for debugfs_create_file functions
- 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
- Update the commit title to be consistent

Changes since v2:
- Added a macro for seq file operations based on recommendation by Andy
Shevchenko. The marco can be moved to seq_file.h at a future point
- Changed the debugfs file names to more relevant ones
- Added information for MTRR registers in the regset file

Changes since v1:
- Fixed seq_printf formatting
- Handled the case when Interrupt remapping is not enabled

Gayatri Kammela (4):
iommu/vt-d: Add debugfs support for Intel IOMMU internals
iommu/vt-d: Add debugfs support to show context internals
iommu/vt-d: Add debugfs support to show register contents
iommu/vt-d: Add debugfs support to show Pasid table contents

Sohil Mehta (1):
iommu/vt-d: Add debugfs support for Interrupt remapping

drivers/iommu/Kconfig | 10 ++
drivers/iommu/Makefile | 1 +
drivers/iommu/intel-iommu-debug.c | 355 ++++++++++++++++++++++++++++++++++++++
drivers/iommu/intel-iommu.c | 35 +---
drivers/iommu/intel-svm.c | 8 -
include/linux/intel-iommu.h | 34 ++++
include/linux/intel-svm.h | 10 +-
7 files changed, 416 insertions(+), 37 deletions(-)
create mode 100644 drivers/iommu/intel-iommu-debug.c