[PATCH 75/88] drm/amdgpu: enforce AMDGPU_GEM_CREATE_NO_CPU_ACCESS

[Alex Deucher]

From: Christian König <christian.koe...@amd.com>

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

Signed-off-by: Christian König <christian.koenig at amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c    | 3 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 5fd0bc7..8dd843d 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;
        }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 992b7f5..a721f50 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -263,6 +263,9 @@ int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)
        bool is_iomem;
        int r;

+       if (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)
+               return -EPERM;
+
        if (bo->kptr) {
                if (ptr) {
                        *ptr = bo->kptr;
-- 
1.8.3.1