drm/amdgpu: Fix missing comment for mb() in 'amdgpu_device_aper_access'

This patch adds the missing code comment for memory barrier

WARNING: memory barrier without comment
+                       mb();

WARNING: memory barrier without comment
+                       mb();

Cc: Guchun Chen <[email protected]>
Cc: Christian König <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: "Pan, Xinhui" <[email protected]>
Signed-off-by: Srinivasan Shanmugam <[email protected]>
Reviewed-by: Guchun Chen <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 91d7f9e4fefc..97d202db1ce5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -305,10 +305,16 @@ size_t amdgpu_device_aper_access(struct amdgpu_device *adev, loff_t pos,
 
 		if (write) {
 			memcpy_toio(addr, buf, count);
+			/* Make sure HDP write cache flush happens without any reordering
+			 * after the system memory contents are sent over PCIe device
+			 */
 			mb();
 			amdgpu_device_flush_hdp(adev, NULL);
 		} else {
 			amdgpu_device_invalidate_hdp(adev, NULL);
+			/* Make sure HDP read cache is invalidated before issuing a read
+			 * to the PCIe device
+			 */
 			mb();
 			memcpy_fromio(buf, addr, count);
 		}