From ade0551fdca553b43b6368e83f9944f3bc647c67 Mon Sep 17 00:00:00 2001 From: Chaudhary Amit Kumar Date: Wed, 17 Oct 2018 17:09:45 +0530 Subject: [PATCH 0957/4131] drm/amdgpu: move taking mmap_sem into get_user_pages v2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This didn't helped as intended, just simplify the code. v2: unlock mmap_sem in the error path as well Signed-off-by: Christian König Reviewed-by: Felix Kuehling Signed-off-by: Kalyan Alle Signed-off-by: Chaudhary Amit Kumar --- drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 9 --------- drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 4 ---- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 8 +++++++- 3 files changed, 7 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c index 98ba5e2..ff6f90a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c @@ -511,7 +511,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p, struct amdgpu_fpriv *fpriv = p->filp->driver_priv; struct amdgpu_bo_list_entry *e; struct list_head duplicates; - bool need_mmap_lock = false; unsigned i, tries = 10; int r; @@ -519,8 +518,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p, p->bo_list = amdgpu_bo_list_get(fpriv, cs->in.bo_list_handle); if (p->bo_list) { - need_mmap_lock = p->bo_list->first_userptr != - p->bo_list->num_entries; amdgpu_bo_list_get_list(p->bo_list, &p->validated); if (p->bo_list->first_userptr != p->bo_list->num_entries) p->mn = amdgpu_mn_get(p->adev); @@ -532,9 +529,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p, if (p->uf_entry.robj && !p->uf_entry.robj->parent) list_add(&p->uf_entry.tv.head, &p->validated); - if (need_mmap_lock) - down_read(¤t->mm->mmap_sem); - while (1) { struct list_head need_pages; unsigned i; @@ -689,9 +683,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p, error_free_pages: - if (need_mmap_lock) - up_read(¤t->mm->mmap_sem); - if (p->bo_list) { for (i = p->bo_list->first_userptr; i < p->bo_list->num_entries; ++i) { diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c index b6ce2b2..bbc3d1e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c @@ -433,8 +433,6 @@ int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data, } if (args->flags & AMDGPU_GEM_USERPTR_VALIDATE) { - down_read(¤t->mm->mmap_sem); - r = amdgpu_ttm_tt_get_user_pages(bo->tbo.ttm, bo->tbo.ttm->pages); if (r) @@ -449,8 +447,6 @@ int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data, amdgpu_bo_unreserve(bo); if (r) goto free_pages; - - up_read(¤t->mm->mmap_sem); } r = drm_gem_handle_create(filp, gobj, &handle); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index a95bbc2..dd9e59a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -680,6 +680,8 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages) if (!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY)) flags |= FOLL_WRITE; + down_read(¤t->mm->mmap_sem); + if (gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) { /* check that we only use anonymous memory to prevent problems with writeback */ @@ -687,8 +689,10 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages) struct vm_area_struct *vma; vma = find_vma(mm, gtt->userptr); - if (!vma || vma->vm_file || vma->vm_end < end) + if (!vma || vma->vm_file || vma->vm_end < end) { + up_read(¤t->mm->mmap_sem); return -EPERM; + } } do { @@ -715,10 +719,12 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages) } while (pinned < ttm->num_pages); + up_read(¤t->mm->mmap_sem); return 0; release_pages: release_pages(pages, pinned, 0); + up_read(¤t->mm->mmap_sem); return r; } -- 2.7.4