Re: [PATCH 0/7] cxl: Add CXL type2 accelerator support for cxl_test

[Alison Schofield <alison.schofield@intel.com>]

On Wed, Apr 22, 2026 at 04:02:30PM -0700, Dave Jiang wrote:
> The series is based on v7.0-rc7 with Alejandro's type2 series [1] and
> with Dan's follow on series [2].
> 
> Series adds a 'type2_test' module parameter where it setup a mock type2
> hierarchy with a mock type2 accelerator device directly under a root
> port that has an auto region setup.
> 
> It also includes a CXL fix that was encountered when running tests with
> the new code.
> 
> [
>   {
>     "memdevs":[
>       {
>         "memdev":"mem0",
>         "ram_size":536870912,
>         "ram_qos_class":42,
>         "host":"cxl_type2_accel.0",
>         "poison_injectable":false
>       }
>     ]
>   },
>   {
>     "regions":[
>       {
>         "region":"region0",
>         "resource":70300293136384,
>         "size":536870912,
>         "type":"ram",
>         "interleave_ways":1,
>         "interleave_granularity":4096,
>         "decode_state":"commit"
>       }
>     ]
>   }
> ]
> 
>     "root decoders":[
>       {
>         "decoder":"decoder0.0",
>         "resource":70300293136384,
>         "size":1073741824,
>         "interleave_ways":1,
>         "accelmem_capable":true,

FWIW - above was a pleasant surprise. We've had accelmem_capable plumbed in
cxl list since 2022 !

That's a segway to a sanity check: is there anything else we want to
display or do in the cxl-cli tooling that is special for Type 2 ?



>         "qos_class":42,
>         "nr_targets":1
>       },
> 
> [1]: https://lore.kernel.org/linux-cxl/20260330143827.1278677-1-alejandro.lucero-palau@amd.com/T/#t
> [2]: https://lore.kernel.org/linux-cxl/20260403210050.1058650-1-dan.j.williams@intel.com/T/#t
> 
> 
> Dave Jiang (7):
>   cxl/test: Refactor mock_init_hdm_decoder() to prep for type2 decoder
>   cxl/test: Add type2 support for mock CFMWS0
>   cxl/test: Refactor platform device enumerations
>   cxl/test: Add hierarchy enumeration support for type2 device
>   cxl/test: Fixup hdm init for auto region to support type2
>   cxl/test: Add cxl_test accelerator driver
>   cxl: Fix double unregistration of CXL regions for type2 devices
> 
>  drivers/cxl/core/region.c      |   3 +-
>  tools/testing/cxl/test/Kbuild  |   2 +
>  tools/testing/cxl/test/accel.c |  71 ++++
>  tools/testing/cxl/test/cxl.c   | 717 ++++++++++++++++++++++++---------
>  4 files changed, 605 insertions(+), 188 deletions(-)
>  create mode 100644 tools/testing/cxl/test/accel.c
> 
> 
> base-commit: 6fa897f2d9a917c4bd7b911b230fcfad05a952c2
> -- 
> 2.53.0
>