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drm/amdgpu: Add support for querying the max ibs in a submission. (v3)

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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
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Bas Nieuwenhuizen 2023-04-13 16:22:53 +02:00 committed by Alex Deucher
parent c30ddcece3
commit 4f18b9a671
2 changed files with 11 additions and 0 deletions
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9
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
View file

@ -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;

2
include/uapi/drm/amdgpu_drm.h
View file

@ -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