From 9d1b3c78052e87fbb1beb7912bf5b2d5b19f2c2c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Christian=20K=C3=B6nig?= Date: Fri, 30 Aug 2019 14:38:37 +0200 Subject: [PATCH] drm/amdgpu: reserve at least 4MB of VRAM for page tables v2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This hopefully helps reduce the contention for page tables. v2: adjust maximum reported VRAM size as well Signed-off-by: Christian König Reviewed-by: Chunming Zhou Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 18 ++++++++++++------ drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 3 +++ drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 9 +++++++-- 3 files changed, 22 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c index 0e2ec608530b..c28dc079a0a1 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c @@ -619,9 +619,12 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file struct drm_amdgpu_info_vram_gtt vram_gtt; vram_gtt.vram_size = adev->gmc.real_vram_size - - atomic64_read(&adev->vram_pin_size); - vram_gtt.vram_cpu_accessible_size = adev->gmc.visible_vram_size - - atomic64_read(&adev->visible_pin_size); + atomic64_read(&adev->vram_pin_size) - + AMDGPU_VM_RESERVED_VRAM; + vram_gtt.vram_cpu_accessible_size = + min(adev->gmc.visible_vram_size - + atomic64_read(&adev->visible_pin_size), + vram_gtt.vram_size); vram_gtt.gtt_size = adev->mman.bdev.man[TTM_PL_TT].size; vram_gtt.gtt_size *= PAGE_SIZE; vram_gtt.gtt_size -= atomic64_read(&adev->gart_pin_size); @@ -634,15 +637,18 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file memset(&mem, 0, sizeof(mem)); mem.vram.total_heap_size = adev->gmc.real_vram_size; mem.vram.usable_heap_size = adev->gmc.real_vram_size - - atomic64_read(&adev->vram_pin_size); + atomic64_read(&adev->vram_pin_size) - + AMDGPU_VM_RESERVED_VRAM; mem.vram.heap_usage = amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]); mem.vram.max_allocation = mem.vram.usable_heap_size * 3 / 4; mem.cpu_accessible_vram.total_heap_size = adev->gmc.visible_vram_size; - mem.cpu_accessible_vram.usable_heap_size = adev->gmc.visible_vram_size - - atomic64_read(&adev->visible_pin_size); + mem.cpu_accessible_vram.usable_heap_size = + min(adev->gmc.visible_vram_size - + atomic64_read(&adev->visible_pin_size), + mem.vram.usable_heap_size); mem.cpu_accessible_vram.heap_usage = amdgpu_vram_mgr_vis_usage(&adev->mman.bdev.man[TTM_PL_VRAM]); mem.cpu_accessible_vram.max_allocation = diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h index 2eda3a8c330d..3352a87b822e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h @@ -99,6 +99,9 @@ struct amdgpu_bo_list_entry; #define AMDGPU_VM_FAULT_STOP_FIRST 1 #define AMDGPU_VM_FAULT_STOP_ALWAYS 2 +/* Reserve 4MB VRAM for page tables */ +#define AMDGPU_VM_RESERVED_VRAM (4ULL << 20) + /* max number of VMHUB */ #define AMDGPU_MAX_VMHUBS 3 #define AMDGPU_GFXHUB_0 0 diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c index 3a9d8c15fe9f..8887b3964e43 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c @@ -23,6 +23,7 @@ */ #include "amdgpu.h" +#include "amdgpu_vm.h" struct amdgpu_vram_mgr { struct drm_mm mm; @@ -275,7 +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 vis_usage = 0, mem_bytes; + uint64_t vis_usage = 0, mem_bytes, max_bytes; unsigned i; int r; @@ -283,9 +284,13 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man, if (!lpfn) lpfn = man->size; + max_bytes = adev->gmc.mc_vram_size; + if (tbo->type != ttm_bo_type_kernel) + max_bytes -= AMDGPU_VM_RESERVED_VRAM; + /* bail out quickly if there's likely not enough VRAM for this BO */ mem_bytes = (u64)mem->num_pages << PAGE_SHIFT; - if (atomic64_add_return(mem_bytes, &mgr->usage) > adev->gmc.mc_vram_size) { + if (atomic64_add_return(mem_bytes, &mgr->usage) > max_bytes) { atomic64_sub(mem_bytes, &mgr->usage); mem->mm_node = NULL; return 0; -- 2.11.0