This is a note to let you know that I've just added the patch titled
drm/amdgpu: Fail fb creation from imported dma-bufs. (v2)
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amdgpu-fail-fb-creation-from-imported-dma-bufs.-v2.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Mar 19 09:58:12 CET 2018
From: Christopher James Halse Rogers <christopher.halse.rogers@xxxxxxxxxxxxx>
Date: Wed, 29 Mar 2017 15:02:11 +1100
Subject: drm/amdgpu: Fail fb creation from imported dma-bufs. (v2)
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@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers@xxxxxxxxxxxxx>
CC: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
Patches currently in stable-queue which might be from christopher.halse.rogers@xxxxxxxxxxxxx are
queue-4.4/drm-amdgpu-fail-fb-creation-from-imported-dma-bufs.-v2.patch
queue-4.4/drm-radeon-fail-fb-creation-from-imported-dma-bufs.patch