From: Christopher James Halse Rogers <christopher.halse.rogers@xxxxxxxxxxxxx>
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.
Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers@xxxxxxxxxxxxx>
CC: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
---
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 39fc388f222a..2f2e9b5c8a6a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -612,6 +612,12 @@ amdgpu_user_framebuffer_create(struct drm_device *dev,
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);
--
2.11.0
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