On 2/26/2026 4:18 PM, Krzysztof Kozlowski wrote:
> On 23/02/2026 20:09, Ekansh Gupta wrote:
>> Add a DRM_QDA_MAP ioctl and supporting FastRPC plumbing to map GEM
>> backed buffers into the DSP virtual address space. The new
>> qda_mem_map UAPI structure allows userspace to request legacy MMAP
>> style mappings or handle-based MEM_MAP mappings with attributes, and
>> encodes flags, offsets and optional virtual address hints that are
>> forwarded to the DSP.
>>
>> On the FastRPC side new method identifiers FASTRPC_RMID_INIT_MMAP
>> and FASTRPC_RMID_INIT_MEM_MAP are introduced together with message
>> structures for map requests and responses. The fastrpc_prepare_args
>> path is extended to build the appropriate request headers, serialize
>> the physical page information derived from a GEM object into a
>> fastrpc_phy_page array and pack the arguments into the shared message
>> buffer used by the existing invoke infrastructure.
>>
>> The qda_ioctl_mmap() handler dispatches mapping requests based on the
>> qda_mem_map request type, reusing the generic fastrpc_invoke()
>> machinery and the RPMsg transport to communicate with the DSP. This
>> provides the foundation for explicit buffer mapping into the DSP
>> address space for subsequent FastRPC calls, aligned with the
>> traditional FastRPC user space model.
>>
>> Signed-off-by: Ekansh Gupta <[email protected]>
>> ---
>> arch/arm64/configs/defconfig | 2 +
> Not relevan there. Don't stuff other subsystem code into your patches.
> Especially without any reasons (your commit msg must explain WHY you are
> doing things).
Please ignore this, it's a mistake pulled from my local test branch. I'm not
going to add any
defconfig changes as part of this patch series.
Thanks for pointing this out.
>
>> drivers/accel/qda/qda_drv.c | 1 +
>> drivers/accel/qda/qda_fastrpc.c | 217
>> ++++++++++++++++++++++++++++++++++++++++
>> drivers/accel/qda/qda_fastrpc.h | 64 ++++++++++++
>> drivers/accel/qda/qda_ioctl.c | 24 +++++
>> drivers/accel/qda/qda_ioctl.h | 13 +++
>> include/uapi/drm/qda_accel.h | 44 +++++++-
>> 7 files changed, 364 insertions(+), 1 deletion(-)
>>
>
>
> Best regards,
> Krzysztof
