aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
diff options
context:
space:
mode:
authorChristian König <christian.koenig@amd.com>2016-02-08 10:57:22 +0100
committerAlex Deucher <alexander.deucher@amd.com>2016-02-10 14:16:43 -0500
commitd7006964d46d76930a44e14f1aae401ccb1797da (patch)
tree5688e0d3eaed9d4fdf404dfe6bfbe5a1c2a9be19 /drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
parent10c1b6183a163aca59ba92b88f2b4c4cecd20d4c (diff)
downloadlinux-stericsson-d7006964d46d76930a44e14f1aae401ccb1797da.tar.gz
drm/amdgpu: fix issue with overlapping userptrs
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>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 55cf05e1c81c..6442a06d6fdc 100644
--- 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 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;