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drm/amdgpu: fix issue with overlapping userptrs

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Otherwise we could try to evict overlapping userptr BOs in get_user_pages(),
leading to a possible circular locking dependency.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Christian König 2016-02-08 10:57:22 +01:00 committed by Alex Deucher
parent f6ff4f67cd
commit cc1de6e800
3 changed files with 23 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -2319,6 +2319,8 @@ bool amdgpu_ttm_bo_is_amdgpu_bo(struct ttm_buffer_object *bo);
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);
bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
unsigned long end);
bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm);
uint32_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
struct ttm_mem_reg *mem);

3
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
View File

@ -142,7 +142,8 @@ static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
list_for_each_entry(bo, &node->bos, mn_list) {
if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound)
if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start,
end))
continue;
r = amdgpu_bo_reserve(bo, true);

19
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
View File

@ -783,6 +783,25 @@ bool amdgpu_ttm_tt_has_userptr(struct ttm_tt *ttm)
return !!gtt->userptr;
}
bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
unsigned long end)
{
struct amdgpu_ttm_tt *gtt = (void *)ttm;
unsigned long size;
if (gtt == NULL)
return false;
if (gtt->ttm.ttm.state != tt_bound || !gtt->userptr)
return false;
size = (unsigned long)gtt->ttm.ttm.num_pages * PAGE_SIZE;
if (gtt->userptr > end || gtt->userptr + size <= start)
return false;
return true;
}
bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm)
{
struct amdgpu_ttm_tt *gtt = (void *)ttm;