From 8c94951560ef29c455043bf2dfa2275b011edc66 Mon Sep 17 00:00:00 2001 From: Matthew Auld Date: Tue, 8 Nov 2022 10:32:38 +0000 Subject: drm/i915: use i915_sg_dma_sizes() for all backends We rely on page_sizes.sg in setup_scratch_page() reporting the correct value if the underlying sgl is not contiguous, however in get_pages_internal() we are only looking at the layout of the created pages when calculating the sg_page_sizes, and not the final sgl, which could in theory be completely different. In such a situation we might incorrectly think we have a 64K scratch page, when it is actually only 4K or similar split over multiple non-contiguous entries, which could lead to broken behaviour when touching the scratch space within the padding of a 64K GTT page-table. For most of the other backends we already just call i915_sg_dma_sizes() on the final mapping, so rather just move that into __i915_gem_object_set_pages() to avoid such issues coming back to bite us later. v2: Update missing conversion in gvt Suggested-by: Tvrtko Ursulin Signed-off-by: Matthew Auld Cc: Stuart Summers Cc: Andrzej Hajda Reviewed-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20221108103238.165447-1-matthew.auld@intel.com --- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 4 +--- drivers/gpu/drm/i915/gem/i915_gem_internal.c | 5 +---- drivers/gpu/drm/i915/gem/i915_gem_object.h | 3 +-- drivers/gpu/drm/i915/gem/i915_gem_pages.c | 7 +++---- drivers/gpu/drm/i915/gem/i915_gem_phys.c | 9 +++------ drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 2 +- drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 2 +- drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 3 +-- drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 4 +--- drivers/gpu/drm/i915/gem/selftests/huge_gem_object.c | 2 +- drivers/gpu/drm/i915/gem/selftests/huge_pages.c | 10 +++------- drivers/gpu/drm/i915/gvt/dmabuf.c | 2 +- drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 5 +---- drivers/gpu/drm/i915/selftests/mock_region.c | 2 +- 14 files changed, 20 insertions(+), 40 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index ec6f7ae47783..1df74f7aa3dc 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -238,7 +238,6 @@ static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) { struct drm_i915_private *i915 = to_i915(obj->base.dev); struct sg_table *sgt; - unsigned int sg_page_sizes; assert_object_held(obj); @@ -262,8 +261,7 @@ static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) (!HAS_LLC(i915) && !IS_DG1(i915))) wbinvd_on_all_cpus(); - sg_page_sizes = i915_sg_dma_sizes(sgt->sgl); - __i915_gem_object_set_pages(obj, sgt, sg_page_sizes); + __i915_gem_object_set_pages(obj, sgt); return 0; } diff --git a/drivers/gpu/drm/i915/gem/i915_gem_internal.c b/drivers/gpu/drm/i915/gem/i915_gem_internal.c index 629acb403a2c..f66bcefc09ec 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_internal.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_internal.c @@ -35,7 +35,6 @@ static int i915_gem_object_get_pages_internal(struct drm_i915_gem_object *obj) struct drm_i915_private *i915 = to_i915(obj->base.dev); struct sg_table *st; struct scatterlist *sg; - unsigned int sg_page_sizes; unsigned int npages; int max_order = MAX_ORDER; unsigned int max_segment; @@ -64,7 +63,6 @@ create_st: sg = st->sgl; st->nents = 0; - sg_page_sizes = 0; do { int order = min(fls(npages) - 1, max_order); @@ -83,7 +81,6 @@ create_st: } while (1); sg_set_page(sg, page, PAGE_SIZE << order, 0); - sg_page_sizes |= PAGE_SIZE << order; st->nents++; npages -= 1 << order; @@ -105,7 +102,7 @@ create_st: goto err; } - __i915_gem_object_set_pages(obj, st, sg_page_sizes); + __i915_gem_object_set_pages(obj, st); return 0; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h index 6b9ecff42bb5..3db53769864c 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h @@ -403,8 +403,7 @@ i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj, unsigned long n); void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj, - struct sg_table *pages, - unsigned int sg_page_sizes); + struct sg_table *pages); int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj); int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c index 16f845663ff2..05a27723ebb8 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c @@ -16,8 +16,7 @@ #include "i915_gem_mman.h" void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj, - struct sg_table *pages, - unsigned int sg_page_sizes) + struct sg_table *pages) { struct drm_i915_private *i915 = to_i915(obj->base.dev); unsigned long supported = RUNTIME_INFO(i915)->page_sizes; @@ -45,8 +44,8 @@ void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj, obj->mm.pages = pages; - GEM_BUG_ON(!sg_page_sizes); - obj->mm.page_sizes.phys = sg_page_sizes; + obj->mm.page_sizes.phys = i915_sg_dma_sizes(pages->sgl); + GEM_BUG_ON(!obj->mm.page_sizes.phys); /* * Calculate the supported page-sizes which fit into the given diff --git a/drivers/gpu/drm/i915/gem/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/i915_gem_phys.c index 0d0e46dae559..68453572275b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_phys.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_phys.c @@ -79,7 +79,7 @@ static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj) /* We're no longer struct page backed */ obj->mem_flags &= ~I915_BO_FLAG_STRUCT_PAGE; - __i915_gem_object_set_pages(obj, st, sg->length); + __i915_gem_object_set_pages(obj, st); return 0; @@ -209,11 +209,8 @@ static int i915_gem_object_shmem_to_phys(struct drm_i915_gem_object *obj) return 0; err_xfer: - if (!IS_ERR_OR_NULL(pages)) { - unsigned int sg_page_sizes = i915_sg_dma_sizes(pages->sgl); - - __i915_gem_object_set_pages(obj, pages, sg_page_sizes); - } + if (!IS_ERR_OR_NULL(pages)) + __i915_gem_object_set_pages(obj, pages); return err; } diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c index 2f7804492cd5..9c759df700ca 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c @@ -247,7 +247,7 @@ rebuild_st: if (i915_gem_object_can_bypass_llc(obj)) obj->cache_dirty = true; - __i915_gem_object_set_pages(obj, st, i915_sg_dma_sizes(st->sgl)); + __i915_gem_object_set_pages(obj, st); return 0; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c index 0c70711818ed..bc9521078807 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c @@ -628,7 +628,7 @@ static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) sg_dma_len(pages->sgl), POISON_INUSE); - __i915_gem_object_set_pages(obj, pages, obj->stolen->size); + __i915_gem_object_set_pages(obj, pages); return 0; } diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c index 2c8b2d5ae903..e4e55e3f4e41 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -815,8 +815,7 @@ static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj, GEM_BUG_ON(obj->mm.rsgt); obj->mm.rsgt = rsgt; - __i915_gem_object_set_pages(obj, &rsgt->table, - i915_sg_dma_sizes(rsgt->table.sgl)); + __i915_gem_object_set_pages(obj, &rsgt->table); } GEM_BUG_ON(bo->ttm && ((obj->base.size >> PAGE_SHIFT) < bo->ttm->num_pages)); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c index ca7a388ba2bf..9348b1804d53 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c @@ -131,7 +131,6 @@ static int i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj) const unsigned long num_pages = obj->base.size >> PAGE_SHIFT; unsigned int max_segment = i915_sg_segment_size(obj->base.dev->dev); struct sg_table *st; - unsigned int sg_page_sizes; struct page **pvec; int ret; @@ -170,8 +169,7 @@ alloc_table: if (i915_gem_object_can_bypass_llc(obj)) obj->cache_dirty = true; - sg_page_sizes = i915_sg_dma_sizes(st->sgl); - __i915_gem_object_set_pages(obj, st, sg_page_sizes); + __i915_gem_object_set_pages(obj, st); return 0; diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_gem_object.c b/drivers/gpu/drm/i915/gem/selftests/huge_gem_object.c index f963b8e1e37b..cbd9b624a788 100644 --- a/drivers/gpu/drm/i915/gem/selftests/huge_gem_object.c +++ b/drivers/gpu/drm/i915/gem/selftests/huge_gem_object.c @@ -68,7 +68,7 @@ static int huge_get_pages(struct drm_i915_gem_object *obj) if (i915_gem_gtt_prepare_pages(obj, pages)) goto err; - __i915_gem_object_set_pages(obj, pages, PAGE_SIZE); + __i915_gem_object_set_pages(obj, pages); return 0; diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c index 0cb99e75b0bc..beaf27e09e8a 100644 --- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c +++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c @@ -136,7 +136,7 @@ static int get_huge_pages(struct drm_i915_gem_object *obj) goto err; GEM_BUG_ON(sg_page_sizes != obj->mm.page_mask); - __i915_gem_object_set_pages(obj, st, sg_page_sizes); + __i915_gem_object_set_pages(obj, st); return 0; @@ -210,7 +210,6 @@ static int fake_get_huge_pages(struct drm_i915_gem_object *obj) const u64 max_len = rounddown_pow_of_two(UINT_MAX); struct sg_table *st; struct scatterlist *sg; - unsigned int sg_page_sizes; u64 rem; st = kmalloc(sizeof(*st), GFP); @@ -226,7 +225,6 @@ static int fake_get_huge_pages(struct drm_i915_gem_object *obj) rem = obj->base.size; sg = st->sgl; st->nents = 0; - sg_page_sizes = 0; do { unsigned int page_size = get_largest_page_size(i915, rem); unsigned int len = min(page_size * div_u64(rem, page_size), @@ -239,8 +237,6 @@ static int fake_get_huge_pages(struct drm_i915_gem_object *obj) sg_dma_len(sg) = len; sg_dma_address(sg) = page_size; - sg_page_sizes |= len; - st->nents++; rem -= len; @@ -254,7 +250,7 @@ static int fake_get_huge_pages(struct drm_i915_gem_object *obj) i915_sg_trim(st); - __i915_gem_object_set_pages(obj, st, sg_page_sizes); + __i915_gem_object_set_pages(obj, st); return 0; } @@ -286,7 +282,7 @@ static int fake_get_huge_pages_single(struct drm_i915_gem_object *obj) sg_dma_len(sg) = obj->base.size; sg_dma_address(sg) = page_size; - __i915_gem_object_set_pages(obj, st, sg->length); + __i915_gem_object_set_pages(obj, st); return 0; #undef GFP diff --git a/drivers/gpu/drm/i915/gvt/dmabuf.c b/drivers/gpu/drm/i915/gvt/dmabuf.c index 01e54b45c5c1..355f1c0e8664 100644 --- a/drivers/gpu/drm/i915/gvt/dmabuf.c +++ b/drivers/gpu/drm/i915/gvt/dmabuf.c @@ -88,7 +88,7 @@ static int vgpu_gem_get_pages( sg_dma_address(sg) = dma_addr; } - __i915_gem_object_set_pages(obj, st, PAGE_SIZE); + __i915_gem_object_set_pages(obj, st); out: if (ret) { dma_addr_t dma_addr; diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c index 27c733b00976..eae7d947d7de 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c @@ -61,7 +61,6 @@ static int fake_get_pages(struct drm_i915_gem_object *obj) #define PFN_BIAS 0x1000 struct sg_table *pages; struct scatterlist *sg; - unsigned int sg_page_sizes; typeof(obj->base.size) rem; pages = kmalloc(sizeof(*pages), GFP); @@ -74,7 +73,6 @@ static int fake_get_pages(struct drm_i915_gem_object *obj) return -ENOMEM; } - sg_page_sizes = 0; rem = obj->base.size; for (sg = pages->sgl; sg; sg = sg_next(sg)) { unsigned long len = min_t(typeof(rem), rem, BIT(31)); @@ -83,13 +81,12 @@ static int fake_get_pages(struct drm_i915_gem_object *obj) sg_set_page(sg, pfn_to_page(PFN_BIAS), len, 0); sg_dma_address(sg) = page_to_phys(sg_page(sg)); sg_dma_len(sg) = len; - sg_page_sizes |= len; rem -= len; } GEM_BUG_ON(rem); - __i915_gem_object_set_pages(obj, pages, sg_page_sizes); + __i915_gem_object_set_pages(obj, pages); return 0; #undef GFP diff --git a/drivers/gpu/drm/i915/selftests/mock_region.c b/drivers/gpu/drm/i915/selftests/mock_region.c index bac21fe84ca5..6324eb32d4dd 100644 --- a/drivers/gpu/drm/i915/selftests/mock_region.c +++ b/drivers/gpu/drm/i915/selftests/mock_region.c @@ -41,7 +41,7 @@ static int mock_region_get_pages(struct drm_i915_gem_object *obj) } pages = &obj->mm.rsgt->table; - __i915_gem_object_set_pages(obj, pages, i915_sg_dma_sizes(pages->sgl)); + __i915_gem_object_set_pages(obj, pages); return 0; -- cgit v1.2.3