[PATCH] drm/amdgpu: add UAPI to query if user queues are supported

[Alex Deucher]

I can move it into device_info if that's better.

Alex

On Fri, Mar 21, 2025 at 3:42 PM Marek Olšák <maraeo at gmail.com> wrote:
>
> This is not in device_info, but it'll do.
>
> Reviewed-by: Marek Olšák <marek.olsak at amd.com>
>
> Marek
>
> On Mon, Mar 17, 2025 at 5:38 PM Alex Deucher <alexander.deucher at amd.com> wrote:
>>
>> Add an INFO query to check if user queues are supported.
>>
>> v2: switch to a mask of IPs (Marek)
>>
>> Cc: marek.olsak at amd.com
>> Cc: prike.liang at amd.com
>> Cc: sunil.khatri at amd.com
>> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
>> ---
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 13 +++++++++++++
>>  include/uapi/drm/amdgpu_drm.h           |  8 ++++++++
>>  2 files changed, 21 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
>> index 3b7dfd56ccd0e..1d683c0487697 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
>> @@ -1340,6 +1340,19 @@ int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
>>                         return -EINVAL;
>>                 }
>>         }
>> +       case AMDGPU_INFO_UQ_SUPPORTED: {
>> +               struct drm_amdgpu_info_uq_supported uq_supported = {};
>> +
>> +               if (adev->userq_funcs[AMDGPU_HW_IP_GFX])
>> +                       uq_supported.supported |= (1 << AMDGPU_HW_IP_GFX);
>> +               if (adev->userq_funcs[AMDGPU_HW_IP_COMPUTE])
>> +                       uq_supported.supported |= (1 << AMDGPU_HW_IP_COMPUTE);
>> +               if (adev->userq_funcs[AMDGPU_HW_IP_DMA])
>> +                       uq_supported.supported |= (1 << AMDGPU_HW_IP_DMA);
>> +               ret = copy_to_user(out, &uq_supported,
>> +                                  min((size_t)size, sizeof(uq_supported))) ? -EFAULT : 0;
>> +               return 0;
>> +       }
>>         default:
>>                 DRM_DEBUG_KMS("Invalid request %d\n", info->query);
>>                 return -EINVAL;
>> diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
>> index 5dbd9037afe75..4b64e91002c05 100644
>> --- a/include/uapi/drm/amdgpu_drm.h
>> +++ b/include/uapi/drm/amdgpu_drm.h
>> @@ -1195,6 +1195,8 @@ struct drm_amdgpu_cs_chunk_cp_gfx_shadow {
>>  #define AMDGPU_INFO_GPUVM_FAULT                        0x23
>>  /* query FW object size and alignment */
>>  #define AMDGPU_INFO_UQ_FW_AREAS                        0x24
>> +/* query if user queues are supported */
>> +#define AMDGPU_INFO_UQ_SUPPORTED               0x25
>>
>>  #define AMDGPU_INFO_MMR_SE_INDEX_SHIFT 0
>>  #define AMDGPU_INFO_MMR_SE_INDEX_MASK  0xff
>> @@ -1572,6 +1574,12 @@ struct drm_amdgpu_info_uq_metadata {
>>         };
>>  };
>>
>> +struct drm_amdgpu_info_uq_supported {
>> +       /** returns a mask for each IP type (1 << AMDGPU_HW_IP_*) */
>> +       __u32   supported;
>> +       __u32   pad;
>> +};
>> +
>>  /*
>>   * Supported GPU families
>>   */
>> --
>> 2.48.1
>>