drm/radeon: add support for MEM_WRITE packet

To make it easier to debug some lockup from userspace add support
to MEM_WRITE packet.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 60 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/evergreen_cs.c b/drivers/gpu/drm/radeon/evergreen_cs.c
index 74c6b42d259..5cea852237e 100644
--- a/drivers/gpu/drm/radeon/evergreen_cs.c
+++ b/drivers/gpu/drm/radeon/evergreen_cs.c
@@ -2654,6 +2654,35 @@ static int evergreen_packet3_check(struct radeon_cs_parser *p,
                         ib[idx+4] = upper_32_bits(offset) & 0xff;
                 }
                 break;
+        case PACKET3_MEM_WRITE:
+        {
+                u64 offset;
+
+                if (pkt->count != 3) {
+                        DRM_ERROR("bad MEM_WRITE (invalid count)\n");
+                        return -EINVAL;
+                }
+                r = evergreen_cs_packet_next_reloc(p, &reloc);
+                if (r) {
+                        DRM_ERROR("bad MEM_WRITE (missing reloc)\n");
+                        return -EINVAL;
+                }
+                offset = radeon_get_ib_value(p, idx+0);
+                offset += ((u64)(radeon_get_ib_value(p, idx+1) & 0xff)) << 32UL;
+                if (offset & 0x7) {
+                        DRM_ERROR("bad MEM_WRITE (address not qwords aligned)\n");
+                        return -EINVAL;
+                }
+                if ((offset + 8) > radeon_bo_size(reloc->robj)) {
+                        DRM_ERROR("bad MEM_WRITE bo too small: 0x%llx, 0x%lx\n",
+                                  offset + 8, radeon_bo_size(reloc->robj));
+                        return -EINVAL;
+                }
+                offset += reloc->lobj.gpu_offset;
+                ib[idx+0] = offset;
+                ib[idx+1] = upper_32_bits(offset) & 0xff;
+                break;
+        }
         case PACKET3_COPY_DW:
                 if (pkt->count != 4) {
                         DRM_ERROR("bad COPY_DW (invalid count)\n");
diff --git a/drivers/gpu/drm/radeon/r600_cs.c b/drivers/gpu/drm/radeon/r600_cs.c
index 0be768be530..9ea13d07cc5 100644
--- a/drivers/gpu/drm/radeon/r600_cs.c
+++ b/drivers/gpu/drm/radeon/r600_cs.c
@@ -2294,6 +2294,35 @@ static int r600_packet3_check(struct radeon_cs_parser *p,
                         ib[idx+4] = upper_32_bits(offset) & 0xff;
                 }
                 break;
+        case PACKET3_MEM_WRITE:
+        {
+                u64 offset;
+
+                if (pkt->count != 3) {
+                        DRM_ERROR("bad MEM_WRITE (invalid count)\n");
+                        return -EINVAL;
+                }
+                r = r600_cs_packet_next_reloc(p, &reloc);
+                if (r) {
+                        DRM_ERROR("bad MEM_WRITE (missing reloc)\n");
+                        return -EINVAL;
+                }
+                offset = radeon_get_ib_value(p, idx+0);
+                offset += ((u64)(radeon_get_ib_value(p, idx+1) & 0xff)) << 32UL;
+                if (offset & 0x7) {
+                        DRM_ERROR("bad MEM_WRITE (address not qwords aligned)\n");
+                        return -EINVAL;
+                }
+                if ((offset + 8) > radeon_bo_size(reloc->robj)) {
+                        DRM_ERROR("bad MEM_WRITE bo too small: 0x%llx, 0x%lx\n",
+                                  offset + 8, radeon_bo_size(reloc->robj));
+                        return -EINVAL;
+                }
+                offset += reloc->lobj.gpu_offset;
+                ib[idx+0] = offset;
+                ib[idx+1] = upper_32_bits(offset) & 0xff;
+                break;
+        }
         case PACKET3_COPY_DW:
                 if (pkt->count != 4) {
                         DRM_ERROR("bad COPY_DW (invalid count)\n");
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 9b1a727d3c9..ff7593498a7 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -68,9 +68,10 @@
  *   2.25.0 - eg+: new info request for num SE and num SH
  *   2.26.0 - r600-eg: fix htile size computation
  *   2.27.0 - r600-SI: Add CS ioctl support for async DMA
+ *   2.28.0 - r600-eg: Add MEM_WRITE packet support
  */
 #define KMS_DRIVER_MAJOR        2
-#define KMS_DRIVER_MINOR        27
+#define KMS_DRIVER_MINOR        28
 #define KMS_DRIVER_PATCHLEVEL   0
 int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags);
 int radeon_driver_unload_kms(struct drm_device *dev);