On 25/03/17 01:33 AM, Marek Olšák wrote:
> Hi,
>
> I'm sharing this idea here, because it's something that has been
> decreasing our performance a lot recently, for example:
> http://openbenchmarking.org/prospect/1703011-RI-RADEONDIR06/7b7668cfc109d1c3dc27e871c8aea71ca13f23fa
The attached proof-of-concept patch (on top of Christian's "CPU mapping
of split VRAM buffers" series, ported from radeon) results in 145.05 fps
on my Tonga.
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 7f9710502bcc..0bb9c0059497 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -205,6 +205,29 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
case TTM_PL_VRAM:
if (adev->mman.buffer_funcs_ring->ready == false) {
amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_CPU);
+ } else if (adev->mc.visible_vram_size < adev->mc.real_vram_size &&
+ bo->mem.start < (adev->mc.visible_vram_size >> PAGE_SHIFT)) {
+ unsigned fpfn = adev->mc.visible_vram_size >> PAGE_SHIFT;
+ int i;
+
+ /* Try evicting to the CPU inaccessible part of VRAM
+ * first, but only set GTT as busy placement, so this
+ * BO will be evicted to GTT rather than causing other
+ * BOs to be evicted from VRAM
+ */
+ amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_VRAM |
+ AMDGPU_GEM_DOMAIN_GTT);
+ abo->placement.num_busy_placement = 0;
+ for (i = 0; i < abo->placement.num_placement; i++) {
+ if (abo->placements[i].flags & TTM_PL_FLAG_VRAM) {
+ if (abo->placements[i].fpfn < fpfn)
+ abo->placements[i].fpfn = fpfn;
+ } else {
+ abo->placement.busy_placement =
+ &abo->placements[i];
+ abo->placement.num_busy_placement = 1;
+ }
+ }
} else {
amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_GTT);
for (i = 0; i < abo->placement.num_placement; ++i) {
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