From c5e4c6bbbdce750a52ae65c429384e7324a50fd3 Mon Sep 17 00:00:00 2001 From: Tom St Denis Date: Mon, 10 Jun 2019 09:53:58 -0400 Subject: [PATCH] drm/amd/amdgpu: Bail out of BO node creation if not enough VRAM (v3) MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit (v2): Return 0 and set mem->mm_node to NULL. (v3): Use atomic64_add_return instead. Signed-off-by: Tom St Denis Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c index 8aea2f21b202..c963ad86072e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c @@ -276,7 +276,7 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man, struct drm_mm_node *nodes; enum drm_mm_insert_mode mode; unsigned long lpfn, num_nodes, pages_per_node, pages_left; - uint64_t usage = 0, vis_usage = 0; + uint64_t vis_usage = 0; unsigned i; int r; @@ -284,6 +284,13 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man, if (!lpfn) lpfn = man->size; + /* bail out quickly if there's likely not enough VRAM for this BO */ + if (atomic64_add_return(mem->num_pages << PAGE_SHIFT, &mgr->usage) > adev->gmc.mc_vram_size) { + atomic64_sub(mem->num_pages << PAGE_SHIFT, &mgr->usage); + mem->mm_node = NULL; + return 0; + } + if (place->flags & TTM_PL_FLAG_CONTIGUOUS) { pages_per_node = ~0ul; num_nodes = 1; @@ -300,8 +307,10 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man, nodes = kvmalloc_array((uint32_t)num_nodes, sizeof(*nodes), GFP_KERNEL | __GFP_ZERO); - if (!nodes) + if (!nodes) { + atomic64_sub(mem->num_pages << PAGE_SHIFT, &mgr->usage); return -ENOMEM; + } mode = DRM_MM_INSERT_BEST; if (place->flags & TTM_PL_FLAG_TOPDOWN) @@ -321,7 +330,6 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man, if (unlikely(r)) break; - usage += nodes[i].size << PAGE_SHIFT; vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]); amdgpu_vram_mgr_virt_start(mem, &nodes[i]); pages_left -= pages; @@ -341,14 +349,12 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man, if (unlikely(r)) goto error; - usage += nodes[i].size << PAGE_SHIFT; vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]); amdgpu_vram_mgr_virt_start(mem, &nodes[i]); pages_left -= pages; } spin_unlock(&mgr->lock); - atomic64_add(usage, &mgr->usage); atomic64_add(vis_usage, &mgr->vis_usage); mem->mm_node = nodes; @@ -359,6 +365,7 @@ error: while (i--) drm_mm_remove_node(&nodes[i]); spin_unlock(&mgr->lock); + atomic64_sub(mem->num_pages << PAGE_SHIFT, &mgr->usage); kvfree(nodes); return r == -ENOSPC ? 0 : r; -- 2.30.2