drm/amdgpu: enforce AMDGPU_GEM_CREATE_NO_CPU_ACCESS

Deny user and kernel mapping if we said we never want to do so.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 5fd0bc73b302..8dd843da799f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -316,7 +316,8 @@ int amdgpu_mode_dumb_mmap(struct drm_file *filp,
                 return -ENOENT;
         }
         robj = gem_to_amdgpu_bo(gobj);
-        if (amdgpu_ttm_tt_has_userptr(robj->tbo.ttm)) {
+        if (amdgpu_ttm_tt_has_userptr(robj->tbo.ttm) ||
+            (robj->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)) {
                 drm_gem_object_unreference_unlocked(gobj);
                 return -EPERM;
         }