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[4/5] drm/vgem: flush page during page fault

Message ID 20180124025606.3020-4-gurchetansingh@chromium.org (mailing list archive)
State New, archived
Headers show

Commit Message

Gurchetan Singh Jan. 24, 2018, 2:56 a.m. UTC 
This is required to use buffers allocated by vgem on AMD and ARM devices.
We're experiencing a case where eviction of the cache races with userspace
writes. To fix this, flush the cache after retrieving a page.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
---
 drivers/gpu/drm/vgem/vgem_drv.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox

Patch

diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
index 802a97e1a4bf..ed6db7218f04 100644
--- a/drivers/gpu/drm/vgem/vgem_drv.c
+++ b/drivers/gpu/drm/vgem/vgem_drv.c
@@ -112,6 +112,7 @@  static int vgem_gem_fault(struct vm_fault *vmf)
 				break;
 		}
 
+		drm_flush_pages(&page, 1);
 	}
 	return ret;
 }