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

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Date:   Tue, 19 Dec 2017 23:25:10 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Sohil Mehta <sohil.mehta@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Ashok Raj <ashok.raj@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: Re: [PATCH v4 0/5] Add Intel IOMMU debugfs support

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@...ux.intel.com>
Intel Finland Oy