From: =?UTF-8?q?Christian=20K=C3=B6nig?= Date: Sat, 2 Sep 2017 13:21:31 +0200 Subject: drm/amdgpu: fix userptr put_page handling MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Git-commit: a216ab09955d6b77f3af4f0aba9255c5ddf382f5 Patch-mainline: v4.15-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 Move calling put_page into the unpopulate callback. Otherwise we mess up the pages reference count when it is unbound multiple times. Signed-off-by: Christian König Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher Acked-by: Petr Tesarik --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 6 ++---- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 14 +++++++++++++- 3 files changed, 16 insertions(+), 5 deletions(-) --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -1793,6 +1793,7 @@ void amdgpu_cs_report_moved_bytes(struct void amdgpu_ttm_placement_from_domain(struct amdgpu_bo *abo, u32 domain); bool amdgpu_ttm_bo_is_amdgpu_bo(struct ttm_buffer_object *bo); int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages); +void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages); int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr, uint32_t flags); bool amdgpu_ttm_tt_has_userptr(struct ttm_tt *ttm); --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c @@ -474,10 +474,8 @@ static int amdgpu_cs_list_validate(struc /* Check if we have user pages and nobody bound the BO already */ if (lobj->user_pages && bo->tbo.ttm->state != tt_bound) { - size_t size = sizeof(struct page *); - - size *= bo->tbo.ttm->num_pages; - memcpy(bo->tbo.ttm->pages, lobj->user_pages, size); + amdgpu_ttm_tt_set_user_pages(bo->tbo.ttm, + lobj->user_pages); binding_userptr = true; } --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -664,6 +664,18 @@ release_pages: return r; } +void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages) +{ + unsigned i; + + for (i = 0; i < ttm->num_pages; ++i) { + if (ttm->pages[i]) + put_page(ttm->pages[i]); + + ttm->pages[i] = pages ? pages[i] : NULL; + } +} + static void amdgpu_trace_dma_map(struct ttm_tt *ttm) { struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev); @@ -738,7 +750,6 @@ static void amdgpu_ttm_tt_unpin_userptr( set_page_dirty(page); mark_page_accessed(page); - put_page(page); } amdgpu_trace_dma_unmap(ttm); @@ -971,6 +982,7 @@ static void amdgpu_ttm_tt_unpopulate(str bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG); if (gtt && gtt->userptr) { + amdgpu_ttm_tt_set_user_pages(ttm, NULL); kfree(ttm->sg); ttm->page_flags &= ~TTM_PAGE_FLAG_SG; return;