drm/radeon: add support for CP DMA packet to r6xx/r7xx CS checker

Currently only memory to memory transfers are allowed.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r600_cs.c b/drivers/gpu/drm/radeon/r600_cs.c
index 211c40252fe0..5d6e7f959e75 100644
--- a/drivers/gpu/drm/radeon/r600_cs.c
+++ b/drivers/gpu/drm/radeon/r600_cs.c
@@ -1949,6 +1949,78 @@ static int r600_packet3_check(struct radeon_cs_parser *p,
                         ib[idx+2] = upper_32_bits(offset) & 0xff;
                 }
                 break;
+        case PACKET3_CP_DMA:
+        {
+                u32 command, size;
+                u64 offset, tmp;
+                if (pkt->count != 4) {
+                        DRM_ERROR("bad CP DMA\n");
+                        return -EINVAL;
+                }
+                command = radeon_get_ib_value(p, idx+4);
+                size = command & 0x1fffff;
+                if (command & PACKET3_CP_DMA_CMD_SAS) {
+                        /* src address space is register */
+                        DRM_ERROR("CP DMA SAS not supported\n");
+                        return -EINVAL;
+                } else {
+                        if (command & PACKET3_CP_DMA_CMD_SAIC) {
+                                DRM_ERROR("CP DMA SAIC only supported for registers\n");
+                                return -EINVAL;
+                        }
+                        /* src address space is memory */
+                        r = r600_cs_packet_next_reloc(p, &reloc);
+                        if (r) {
+                                DRM_ERROR("bad CP DMA SRC\n");
+                                return -EINVAL;
+                        }
+
+                        tmp = radeon_get_ib_value(p, idx) +
+                                ((u64)(radeon_get_ib_value(p, idx+1) & 0xff) << 32);
+
+                        offset = reloc->lobj.gpu_offset + tmp;
+
+                        if ((tmp + size) > radeon_bo_size(reloc->robj)) {
+                                dev_warn(p->dev, "CP DMA src buffer too small (%llu %lu)\n",
+                                         tmp + size, radeon_bo_size(reloc->robj));
+                                return -EINVAL;
+                        }
+
+                        ib[idx] = offset;
+                        ib[idx+1] = (ib[idx+1] & 0xffffff00) | (upper_32_bits(offset) & 0xff);
+                }
+                if (command & PACKET3_CP_DMA_CMD_DAS) {
+                        /* dst address space is register */
+                        DRM_ERROR("CP DMA DAS not supported\n");
+                        return -EINVAL;
+                } else {
+                        /* dst address space is memory */
+                        if (command & PACKET3_CP_DMA_CMD_DAIC) {
+                                DRM_ERROR("CP DMA DAIC only supported for registers\n");
+                                return -EINVAL;
+                        }
+                        r = r600_cs_packet_next_reloc(p, &reloc);
+                        if (r) {
+                                DRM_ERROR("bad CP DMA DST\n");
+                                return -EINVAL;
+                        }
+
+                        tmp = radeon_get_ib_value(p, idx+2) +
+                                ((u64)(radeon_get_ib_value(p, idx+3) & 0xff) << 32);
+
+                        offset = reloc->lobj.gpu_offset + tmp;
+
+                        if ((tmp + size) > radeon_bo_size(reloc->robj)) {
+                                dev_warn(p->dev, "CP DMA dst buffer too small (%llu %lu)\n",
+                                         tmp + size, radeon_bo_size(reloc->robj));
+                                return -EINVAL;
+                        }
+
+                        ib[idx+2] = offset;
+                        ib[idx+3] = upper_32_bits(offset) & 0xff;
+                }
+                break;
+        }
         case PACKET3_SURFACE_SYNC:
                 if (pkt->count != 3) {
                         DRM_ERROR("bad SURFACE_SYNC\n");