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

From: Andy Shevchenko
Date: Tue Dec 19 2017 - 16:28:20 EST


On Tue, 2017-12-19 at 13:08 -0800, Sohil Mehta wrote:
> 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
> '/sys/kernel/debug/intel_iommu/'.

Perhaps you need to switch to SPDX license pointer.
I dunno if Thomas' patch with documentation how to do this made upstream
/ linux-next yet.

>
> Regards,
> Sohil
>
> 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
>

--
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy