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drm/amdgpu: move taking mmap_sem into get_user_pages v2

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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 <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2017-09-03 15:22:06 +02:00 committed by Alex Deucher
parent 862095237c
commit b72cf4fca2
3 changed files with 8 additions and 16 deletions
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12
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
View File

@ -500,18 +500,14 @@ 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;
INIT_LIST_HEAD(&p->validated);
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;
if (p->bo_list)
amdgpu_bo_list_get_list(p->bo_list, &p->validated);
}
INIT_LIST_HEAD(&duplicates);
amdgpu_vm_get_pd_bo(&fpriv->vm, &p->validated, &p->vm_pd);
@ -519,9 +515,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
if (p->uf_entry.robj)
list_add(&p->uf_entry.tv.head, &p->validated);
if (need_mmap_lock)
down_read(&current->mm->mmap_sem);
while (1) {
struct list_head need_pages;
unsigned i;
@ -674,9 +667,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
error_free_pages:
if (need_mmap_lock)
up_read(&current->mm->mmap_sem);
if (p->bo_list) {
for (i = p->bo_list->first_userptr;
i < p->bo_list->num_entries; ++i) {

4
drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
View File

@ -318,8 +318,6 @@ int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data,
}
if (args->flags & AMDGPU_GEM_USERPTR_VALIDATE) {
down_read(&current->mm->mmap_sem);
r = amdgpu_ttm_tt_get_user_pages(bo->tbo.ttm,
bo->tbo.ttm->pages);
if (r)
@ -334,8 +332,6 @@ int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data,
amdgpu_bo_unreserve(bo);
if (r)
goto free_pages;
up_read(&current->mm->mmap_sem);
}
r = drm_gem_handle_create(filp, gobj, &handle);

8
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
View File

@ -622,6 +622,8 @@ 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(&current->mm->mmap_sem);
if (gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) {
/* check that we only use anonymous memory
to prevent problems with writeback */
@ -629,8 +631,10 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
struct vm_area_struct *vma;
vma = find_vma(gtt->usermm, gtt->userptr);
if (!vma || vma->vm_file || vma->vm_end < end)
if (!vma || vma->vm_file || vma->vm_end < end) {
up_read(&current->mm->mmap_sem);
return -EPERM;
}
}
do {
@ -657,10 +661,12 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
} while (pinned < ttm->num_pages);
up_read(&current->mm->mmap_sem);
return 0;
release_pages:
release_pages(pages, pinned, 0);
up_read(&current->mm->mmap_sem);
return r;
}