[PATCH 08/12] drm/radeon: add a check to wait_reg_mem command

[Ilija Hadzic]

WAIT_REG_MEM on register does not allow the use of PFP.
Enforce this restriction when checking packets sent from
userland.

Signed-off-by: Ilija Hadzic <ihadzic at research.bell-labs.com>
---
 drivers/gpu/drm/radeon/evergreen_cs.c | 3 +++
 drivers/gpu/drm/radeon/r600_cs.c      | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/radeon/evergreen_cs.c 
b/drivers/gpu/drm/radeon/evergreen_cs.c
index 2690532..02aeb7f 100644
--- a/drivers/gpu/drm/radeon/evergreen_cs.c
+++ b/drivers/gpu/drm/radeon/evergreen_cs.c
@@ -2101,6 +2101,9 @@ static int evergreen_packet3_check(struct 
radeon_cs_parser *p,

                        ib[idx+1] = (ib[idx+1] & 0x3) | (offset & 0xfffffffc);
                        ib[idx+2] = upper_32_bits(offset) & 0xff;
+               } else if (idx_value & 0x100) {
+                       DRM_ERROR("cannot use PFP on REG wait\n");
+                       return -EINVAL;
                }
                break;
        case PACKET3_CP_DMA:
diff --git a/drivers/gpu/drm/radeon/r600_cs.c b/drivers/gpu/drm/radeon/r600_cs.c
index 5d59275..d64432b 100644
--- a/drivers/gpu/drm/radeon/r600_cs.c
+++ b/drivers/gpu/drm/radeon/r600_cs.c
@@ -949,6 +949,11 @@ int r600_cs_common_vline_parse(struct radeon_cs_parser *p,
                DRM_ERROR("vline WAIT_REG_MEM waiting on MEM instead of REG\n");
                return -EINVAL;
        }
+       /* bit 8 is me (0) or pfp (1) */
+       if (wait_reg_mem_info & 0x100) {
+               DRM_ERROR("vline WAIT_REG_MEM waiting on PFP instead of ME\n");
+               return -EINVAL;
+       }
        /* waiting for value to be equal */
        if ((wait_reg_mem_info & 0x7) != 0x3) {
                DRM_ERROR("vline WAIT_REG_MEM function not equal\n");
@@ -1847,6 +1852,9 @@ static int r600_packet3_check(struct radeon_cs_parser *p,

                        ib[idx+1] = (ib[idx+1] & 0x3) | (offset & 0xfffffff0);
                        ib[idx+2] = upper_32_bits(offset) & 0xff;
+               } else if (idx_value & 0x100) {
+                       DRM_ERROR("cannot use PFP on REG wait\n");
+                       return -EINVAL;
                }
                break;
        case PACKET3_CP_DMA:
-- 
1.7.12