Re: [PATCH RFC 0/3] PCI/TPH: Expose CPU-to-Steering Tag mappings via debugfs

[Wei Huang]

Hi Bjorn,

Gentle ping on this patch series. Do you have any feedback, or would you be
comfortable to add this support into PCI TPH?

Thanks,
-Wei

On Thu, Oct 01, 2026 at 10:55:48AM -0500, Wei Huang wrote:
> Add reusable per-device PCI debugfs directories and use them to expose
> the firmware-provided CPU-to-Steering Tag mapping for each Root Port.
> Factor the ACPI _DSM query path for reuse and document the new read-only
> interface.
> 
> Wei Huang (3):
>   PCI/TPH: Factor out the ST _DSM evaluation
>   PCI: Add per-device debugfs directories
>   Expose the CPU/Steering Tag mapping via debugfs
> 
>  Documentation/PCI/tph.rst |  32 ++++++
>  drivers/pci/Makefile      |   1 +
>  drivers/pci/debugfs.c     |  60 ++++++++++++
>  drivers/pci/pci.h         |  12 +++
>  drivers/pci/remove.c      |   1 +
>  drivers/pci/tph.c         | 201 ++++++++++++++++++++++++++++++++++----
>  include/linux/pci.h       |   3 +
>  7 files changed, 290 insertions(+), 20 deletions(-)
>  create mode 100644 drivers/pci/debugfs.c
> 
> -- 
> 2.55.0
>