drm/ttm: make TT creation purely optional v3 (2ddef176) · Commits · 戴 / test

drivers/gpu/drm/ttm/ttm_bo.c

+9 −28

Original line number	Diff line number	Diff line
		@@ -292,12 +292,11 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
		*/

		if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
		if (bo->ttm == NULL) {
		bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);

		ret = ttm_tt_create(bo, zero);
		if (ret)
		goto out_err;
		}

		ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
		if (ret)
		@@ -660,13 +659,8 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
		placement.num_busy_placement = 0;
		bdev->driver->evict_flags(bo, &placement);

		if (!placement.num_placement && !placement.num_busy_placement) {
		ret = ttm_bo_pipeline_gutting(bo);
		if (ret)
		return ret;

		return ttm_tt_create(bo, false);
		}
		if (!placement.num_placement && !placement.num_busy_placement)
		return ttm_bo_pipeline_gutting(bo);

		evict_mem = bo->mem;
		evict_mem.mm_node = NULL;
		@@ -1195,13 +1189,8 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
		/*
		* Remove the backing store if no placement is given.
		*/
		if (!placement->num_placement && !placement->num_busy_placement) {
		ret = ttm_bo_pipeline_gutting(bo);
		if (ret)
		return ret;

		return ttm_tt_create(bo, false);
		}
		if (!placement->num_placement && !placement->num_busy_placement)
		return ttm_bo_pipeline_gutting(bo);

		/*
		* Check whether we need to move buffer.
		@@ -1218,14 +1207,6 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
		ttm_flag_masked(&bo->mem.placement, new_flags,
		~TTM_PL_MASK_MEMTYPE);
		}
		/*
		* We might need to add a TTM.
		*/
		if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
		ret = ttm_tt_create(bo, true);
		if (ret)
		return ret;
		}
		return 0;
		}
		EXPORT_SYMBOL(ttm_bo_validate);

drivers/gpu/drm/ttm/ttm_bo_util.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -532,12 +532,15 @@ static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
		.interruptible = false,
		.no_wait_gpu = false
		};
		struct ttm_tt *ttm = bo->ttm;
		struct ttm_tt *ttm;
		pgprot_t prot;
		int ret;

		BUG_ON(!ttm);
		ret = ttm_tt_create(bo, true);
		if (ret)
		return ret;

		ttm = bo->ttm;
		ret = ttm_tt_populate(ttm, &ctx);
		if (ret)
		return ret;

drivers/gpu/drm/ttm/ttm_bo_vm.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -349,6 +349,11 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,

		};

		if (ttm_tt_create(bo, true)) {
		ret = VM_FAULT_OOM;
		goto out_io_unlock;
		}

		ttm = bo->ttm;
		if (ttm_tt_populate(bo->ttm, &ctx)) {
		ret = VM_FAULT_OOM;

drivers/gpu/drm/ttm/ttm_tt.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -50,6 +50,9 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)

		dma_resv_assert_held(bo->base.resv);

		if (bo->ttm)
		return 0;

		if (bdev->need_dma32)
		page_flags \|= TTM_PAGE_FLAG_DMA32;

		@@ -67,7 +70,6 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
		page_flags \|= TTM_PAGE_FLAG_SG;
		break;
		default:
		bo->ttm = NULL;
		pr_err("Illegal buffer object type\n");
		return -EINVAL;
		}

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