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drm/amdgpu: Don't force BOs into visible VRAM for page faults

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There is no need for page faults to force BOs into visible VRAM if it's
full, and the time it takes to do so is great enough to cause noticeable
stuttering. Add GTT as a possible placement so that if visible VRAM is
full, page faults move BOs to GTT instead of evicting other BOs from VRAM.

Suggested-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: John Brooks <john@fastquake.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
John Brooks 2017-06-27 22:33:21 -04:00 committed by Alex Deucher
parent 96cf8271df
commit 41d9a6a728
1 changed files with 10 additions and 7 deletions
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17
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
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@ -974,18 +974,21 @@ int amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
/* hurrah the memory is not visible ! */
atomic64_inc(&adev->num_vram_cpu_page_faults);
amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_VRAM);
amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_VRAM |
AMDGPU_GEM_DOMAIN_GTT);
/* Avoid costly evictions; only set GTT as a busy placement */
abo->placement.num_busy_placement = 1;
abo->placement.busy_placement = &abo->placements[1];
r = ttm_bo_validate(bo, &abo->placement, false, false);
if (unlikely(r == -ENOMEM)) {
amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_GTT);
return ttm_bo_validate(bo, &abo->placement, false, false);
} else if (unlikely(r != 0)) {
if (unlikely(r != 0))
return r;
}
offset = bo->mem.start << PAGE_SHIFT;
/* this should never happen */
if ((offset + size) > adev->mc.visible_vram_size)
if (bo->mem.mem_type == TTM_PL_VRAM &&
(offset + size) > adev->mc.visible_vram_size)
return -EINVAL;
return 0;