drm/amdgpu: remove amdgpu_cs_try_evict

Trying to evict things from the current working set doesn't work that
well anymore because of per VM BOs.

Rely on reserving VRAM for page tables to avoid contention.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -478,7 +478,6 @@ struct amdgpu_cs_parser {
 	uint64_t			bytes_moved_vis_threshold;
 	uint64_t			bytes_moved;
 	uint64_t			bytes_moved_vis;
-	struct amdgpu_bo_list_entry	*evictable;
 
 	/* user fence */
 	struct amdgpu_bo_list_entry	uf_entry;

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -449,75 +449,12 @@ static int amdgpu_cs_bo_validate(struct amdgpu_cs_parser *p,
 	return r;
 }
 
-/* Last resort, try to evict something from the current working set */
-static bool amdgpu_cs_try_evict(struct amdgpu_cs_parser *p,
-				struct amdgpu_bo *validated)
-{
-	uint32_t domain = validated->allowed_domains;
-	struct ttm_operation_ctx ctx = { true, false };
-	int r;
-
-	if (!p->evictable)
-		return false;
-
-	for (;&p->evictable->tv.head != &p->validated;
-	     p->evictable = list_prev_entry(p->evictable, tv.head)) {
-
-		struct amdgpu_bo_list_entry *candidate = p->evictable;
-		struct amdgpu_bo *bo = ttm_to_amdgpu_bo(candidate->tv.bo);
-		struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
-		bool update_bytes_moved_vis;
-		uint32_t other;
-
-		/* If we reached our current BO we can forget it */
-		if (bo == validated)
-			break;
-
-		/* We can't move pinned BOs here */
-		if (bo->pin_count)
-			continue;
-
-		other = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);
-
-		/* Check if this BO is in one of the domains we need space for */
-		if (!(other & domain))
-			continue;
-
-		/* Check if we can move this BO somewhere else */
-		other = bo->allowed_domains & ~domain;
-		if (!other)
-			continue;
-
-		/* Good we can try to move this BO somewhere else */
-		update_bytes_moved_vis =
-				!amdgpu_gmc_vram_full_visible(&adev->gmc) &&
-				amdgpu_bo_in_cpu_visible_vram(bo);
-		amdgpu_bo_placement_from_domain(bo, other);
-		r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
-		p->bytes_moved += ctx.bytes_moved;
-		if (update_bytes_moved_vis)
-			p->bytes_moved_vis += ctx.bytes_moved;
-
-		if (unlikely(r))
-			break;
-
-		p->evictable = list_prev_entry(p->evictable, tv.head);
-		list_move(&candidate->tv.head, &p->validated);
-
-		return true;
-	}
-
-	return false;
-}
-
 static int amdgpu_cs_validate(void *param, struct amdgpu_bo *bo)
 {
 	struct amdgpu_cs_parser *p = param;
 	int r;
 
-	do {
-		r = amdgpu_cs_bo_validate(p, bo);
-	} while (r == -ENOMEM && amdgpu_cs_try_evict(p, bo));
+	r = amdgpu_cs_bo_validate(p, bo);
 	if (r)
 		return r;
 
@@ -556,9 +493,6 @@ static int amdgpu_cs_list_validate(struct amdgpu_cs_parser *p,
 			binding_userptr = true;
 		}
 
-		if (p->evictable == lobj)
-			p->evictable = NULL;
-
 		r = amdgpu_cs_validate(p, bo);
 		if (r)
 			return r;
@@ -661,9 +595,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
 					  &p->bytes_moved_vis_threshold);
 	p->bytes_moved = 0;
 	p->bytes_moved_vis = 0;
-	p->evictable = list_last_entry(&p->validated,
-				       struct amdgpu_bo_list_entry,
-				       tv.head);
 
 	r = amdgpu_vm_validate_pt_bos(p->adev, &fpriv->vm,
 				      amdgpu_cs_validate, p);