[PATCH] drm/radeon: add cayman VM support for append packet.

[Dave Airlie]

From: Dave Airlie <airl...@redhat.com>

This adds support for SET_APPEND_CNT packet3 to the VM paths.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/radeon/evergreen_cs.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/radeon/evergreen_cs.c 
b/drivers/gpu/drm/radeon/evergreen_cs.c
index 18ddd75..0d3f744 100644
--- a/drivers/gpu/drm/radeon/evergreen_cs.c
+++ b/drivers/gpu/drm/radeon/evergreen_cs.c
@@ -3483,6 +3483,27 @@ static int evergreen_vm_packet3_check(struct 
radeon_device *rdev,
                        }
                }
                break;
+       case PACKET3_SET_APPEND_CNT: {
+               uint32_t areg;
+               uint32_t allowed_reg_base;
+
+               if (pkt->count != 2) {
+                       DRM_ERROR("bad SET_APPEND_CNT (invalid count)\n");
+                       return -EINVAL;
+               }
+
+               allowed_reg_base = GDS_APPEND_COUNT_0;
+               allowed_reg_base -= PACKET3_SET_CONTEXT_REG_START;
+               allowed_reg_base >>= 2;
+
+               areg = idx_value >> 16;
+               if (areg < allowed_reg_base || areg > (allowed_reg_base + 11)) {
+                       DRM_ERROR("forbidden register for append cnt 0x%08x at 
%d\n",
+                                 areg, idx);
+                       return -EINVAL;
+               }
+               break;
+       }
        default:
                return -EINVAL;
        }
-- 
2.1.0