Re: [PATCH 0/5] Add debugfs support for ARM SMMUv3

[Qinxin Xia]

On 2026/5/27 08:07:17, Nicolin Chen <nicolinc@xxxxxxxxxx> wrote:
> On Wed, May 20, 2026 at 02:37:06PM +0800, Qinxin Xia wrote:
> > Add a comprehensive debugfs framework to the ARM SMMUv3 driver,
> > providing visibility into internal hardware state for debugging
> > and performance analysis. The debugfs entries are organized under
> > /sys/kernel/debug/iommu/arm_smmu_v3/, with per-SMMU instance directories
> > and per-device stream table entries.
> >
> > Each SMMU instance provides:
> > - capabilities – static SMMU features and queue sizes.
> > - registers – SMMU key registers.
> > - stream_table/ – a directory per device with subdirectories per Stream ID.
> >
> > Each Stream ID subdirectory contains:
> > - ste – the Stream Table Entry in decoded and raw format.
> > - cd – all valid Context Descriptors (Stage 1 translation tables) associated with the device.
> > - a symlink named with the device's BDF/name pointing to its sysfs directory for easy navigation.
> >
> > /sys/kernel/debug/iommu/arm_smmu_v3/smmu0/stream_table/
> >      ├── <sid>/
> >      │   ├── ste
> >      │   ├── cd
> >      │   └── <dev_name>
> >
> > Changes since RFCv2:
> >    Address review comments from Nicolin Chen, kernel test robot, and Sashiko
> >    automated review:
>
> This seems to reuse the same message ID as RFCv2's?
>
> So, it ended up with attaching to RFCv2, on my side (mutt).
>
> Sashiko also failed to review against the new patches:
> https://sashiko.dev/#/patchset/20260328101706.3448655-1-xiaqinxin%40huawei.com
>
> Nicolin

Sorry for the late reply – I've been juggling a few things and missed 
this update earlier.

I'll fold all the fixes into the next spin. Expect v3 soon.:-)

--
Thanks,
Qinxin