From 2ddef17678bc2ea1d20517dd2b4ed4aa967ffa8b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Christian=20K=C3=B6nig?= Date: Wed, 24 Jun 2020 15:15:20 +0200 Subject: drm/ttm: make TT creation purely optional v3 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit We only need the page array when the BO is about to be accessed. So not only populate, but also create it on demand. v2: move NULL check into ttm_tt_create() v3: fix the occurrence in ttm_bo_kmap_ttm as well Signed-off-by: Christian König Reviewed-by: Michael J. Ruhl Link: https://patchwork.freedesktop.org/patch/373182/ --- drivers/gpu/drm/ttm/ttm_bo.c | 37 +++++++++---------------------------- drivers/gpu/drm/ttm/ttm_bo_util.c | 7 +++++-- drivers/gpu/drm/ttm/ttm_bo_vm.c | 5 +++++ drivers/gpu/drm/ttm/ttm_tt.c | 4 +++- 4 files changed, 22 insertions(+), 31 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index 2da8dbd2553b..0c13fe96c7e3 100644 --- a/drivers/gpu/drm/ttm/ttm_bo.c +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -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; - } + 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); diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c index f09b096ba4fd..5e0f3a9caedc 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_util.c +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c @@ -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; diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c index a43aa7275f12..82b893d4249f 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c @@ -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; diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 2ec448e1d663..e25d4097aa16 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -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; } -- cgit v1.2.3