Am 29.03.2017 um 06:00 schrieb raof@xxxxxxxxxx:
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
For this one and the amdgpu variant: Reviewed-by: Christian König
<christian.koenig@xxxxxxx>.
---
drivers/gpu/drm/radeon/radeon_display.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index aea8b62835a4..f85e9c1eaa47 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -1352,6 +1352,12 @@ radeon_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);
+ }
+
radeon_fb = kzalloc(sizeof(*radeon_fb), GFP_KERNEL);
if (radeon_fb == NULL) {
drm_gem_object_unreference_unlocked(obj);
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