drm/radeon: add more pedantic checks in the CP DMA checker
non-mem-to-mem transfers require dw aligned byte count.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/evergreen_cs.c b/drivers/gpu/drm/radeon/evergreen_cs.c
index 9a9d3ae..74c6b42 100644
--- a/drivers/gpu/drm/radeon/evergreen_cs.c
+++ b/drivers/gpu/drm/radeon/evergreen_cs.c
@@ -2256,6 +2256,18 @@
command = radeon_get_ib_value(p, idx+4);
size = command & 0x1fffff;
info = radeon_get_ib_value(p, idx+1);
+ if ((((info & 0x60000000) >> 29) != 0) || /* src = GDS or DATA */
+ (((info & 0x00300000) >> 20) != 0) || /* dst = GDS */
+ ((((info & 0x00300000) >> 20) == 0) &&
+ (command & PACKET3_CP_DMA_CMD_DAS)) || /* dst = register */
+ ((((info & 0x60000000) >> 29) == 0) &&
+ (command & PACKET3_CP_DMA_CMD_SAS))) { /* src = register */
+ /* non mem to mem copies requires dw aligned count */
+ if (size % 4) {
+ DRM_ERROR("CP DMA command requires dw count alignment\n");
+ return -EINVAL;
+ }
+ }
if (command & PACKET3_CP_DMA_CMD_SAS) {
/* src address space is register */
/* GDS is ok */
@@ -3472,6 +3484,18 @@
case PACKET3_CP_DMA:
command = ib[idx + 4];
info = ib[idx + 1];
+ if ((((info & 0x60000000) >> 29) != 0) || /* src = GDS or DATA */
+ (((info & 0x00300000) >> 20) != 0) || /* dst = GDS */
+ ((((info & 0x00300000) >> 20) == 0) &&
+ (command & PACKET3_CP_DMA_CMD_DAS)) || /* dst = register */
+ ((((info & 0x60000000) >> 29) == 0) &&
+ (command & PACKET3_CP_DMA_CMD_SAS))) { /* src = register */
+ /* non mem to mem copies requires dw aligned count */
+ if ((command & 0x1fffff) % 4) {
+ DRM_ERROR("CP DMA command requires dw count alignment\n");
+ return -EINVAL;
+ }
+ }
if (command & PACKET3_CP_DMA_CMD_SAS) {
/* src address space is register */
if (((info & 0x60000000) >> 29) == 0) {