This info would be used by radv to figure out when we need to split a submission into multiple submissions. radv currently has a limit of 192 which seems to work for most gfx submissions, but is way too high for e.g. compute or sdma. Userspace is available at https://gitlab.freedesktop.org/bnieuwenhuizen/mesa/-/commits/ib-rejection-v3 v3: Completely rewrote based on suggestion of making it a separate query. Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2498 Signed-off-by: Bas Nieuwenhuizen <bas@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 9 +++++++++ include/uapi/drm/amdgpu_drm.h | 2 ++ 2 files changed, 11 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c index 0efb38539d70..1a2e342af1c0 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c @@ -1140,6 +1140,15 @@ int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) kfree(caps); return r; } + case AMDGPU_INFO_MAX_IBS: { + uint32_t max_ibs[AMDGPU_HW_IP_NUM]; + + for (i = 0; i < AMDGPU_HW_IP_NUM; ++i) + max_ibs[i] = amdgpu_ring_max_ibs(i); + + return copy_to_user(out, max_ibs, + min((size_t)size, sizeof(max_ibs))) ? -EFAULT : 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 b6eb90df5d05..6981e59a9401 100644 --- a/include/uapi/drm/amdgpu_drm.h +++ b/include/uapi/drm/amdgpu_drm.h @@ -876,6 +876,8 @@ struct drm_amdgpu_cs_chunk_data { #define AMDGPU_INFO_VIDEO_CAPS_DECODE 0 /* Subquery id: Encode */ #define AMDGPU_INFO_VIDEO_CAPS_ENCODE 1 +/* Query the max number of IBs per gang per submission */ +#define AMDGPU_INFO_MAX_IBS 0x22 #define AMDGPU_INFO_MMR_SE_INDEX_SHIFT 0 #define AMDGPU_INFO_MMR_SE_INDEX_MASK 0xff -- 2.40.0
