4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christopher James Halse Rogers <christopher.halse.rogers@xxxxxxxxxxxxx>
[ Upstream commit 1769152ac64b0b07583f696b621624df2ca4c840 ]
Any use of the framebuffer will migrate it to VRAM, which is not sensible for
an imported dma-buf.
v2: Use DRM_DEBUG_KMS to prevent userspace accidentally spamming dmesg.
Reviewed-by: Michel Dänzer <michel.daenzer at amd.com>
Reviewed-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers at canonical.com>
CC: amd-gfx at lists.freedesktop.org
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Sasha Levin <alexander.levin at microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -560,6 +560,12 @@ amdgpu_user_framebuffer_create(struct dr
return ERR_PTR(-ENOENT);
}
+ /* Handle is imported dma-buf, so cannot be migrated to VRAM for scanout */
+ if (obj->import_attach) {
+ DRM_DEBUG_KMS("Cannot create framebuffer from imported dma_buf\n");
+ return ERR_PTR(-EINVAL);
+ }
+
amdgpu_fb = kzalloc(sizeof(*amdgpu_fb), GFP_KERNEL);
if (amdgpu_fb == NULL) {
drm_gem_object_unreference_unlocked(obj);
