4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christian König <christian.koenig@xxxxxxx>
commit cc1de6e800c253172334f8774c419dc64401cd2e upstream.
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@xxxxxxx>
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 ++
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 3 ++-
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 19 +++++++++++++++++++
3 files changed, 23 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -2312,6 +2312,8 @@ bool amdgpu_ttm_bo_is_amdgpu_bo(struct t
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);
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -142,7 +142,8 @@ static void amdgpu_mn_invalidate_range_s
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);
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -783,6 +783,25 @@ bool amdgpu_ttm_tt_has_userptr(struct tt
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;
--
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