drm: Add general-purpose packet for manipulating scratch registers (r300)

From: Aapo Tahkola (via DRM CVS)
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/char/drm/r300_cmdbuf.c b/drivers/char/drm/r300_cmdbuf.c
index 20b6cb39213d..b108c7f913b2 100644
--- a/drivers/char/drm/r300_cmdbuf.c
+++ b/drivers/char/drm/r300_cmdbuf.c
@@ -704,6 +704,64 @@ static void r300_discard_buffer(drm_device_t * dev, drm_buf_t * buf)
         buf->used = 0;
 }
 
+static int r300_scratch(drm_radeon_private_t *dev_priv,
+                        drm_radeon_kcmd_buffer_t *cmdbuf,
+                        drm_r300_cmd_header_t header)
+{
+        u32 *ref_age_base;
+        u32 i, buf_idx, h_pending;
+        RING_LOCALS;
+        
+        if (cmdbuf->bufsz < 
+            (sizeof(u64) + header.scratch.n_bufs * sizeof(buf_idx))) {
+                return DRM_ERR(EINVAL);
+        }
+        
+        if (header.scratch.reg >= 5) {
+                return DRM_ERR(EINVAL);
+        }
+        
+        dev_priv->scratch_ages[header.scratch.reg]++;
+        
+        ref_age_base = *(u32 **)cmdbuf->buf;
+        
+        cmdbuf->buf += sizeof(u64);
+        cmdbuf->bufsz -= sizeof(u64);
+        
+        for (i=0; i < header.scratch.n_bufs; i++) {
+                buf_idx = *(u32 *)cmdbuf->buf;
+                buf_idx *= 2; /* 8 bytes per buf */
+                
+                if (DRM_COPY_TO_USER(ref_age_base + buf_idx, &dev_priv->scratch_ages[header.scratch.reg], sizeof(u32))) {
+                        return DRM_ERR(EINVAL);
+                }
+                                        
+                if (DRM_COPY_FROM_USER(&h_pending, ref_age_base + buf_idx + 1, sizeof(u32))) {
+                        return DRM_ERR(EINVAL);
+                }
+                                        
+                if (h_pending == 0) {
+                        return DRM_ERR(EINVAL);
+                }
+                                        
+                h_pending--;
+                                                
+                if (DRM_COPY_TO_USER(ref_age_base + buf_idx + 1, &h_pending, sizeof(u32))) {
+                        return DRM_ERR(EINVAL);
+                }
+                                        
+                cmdbuf->buf += sizeof(buf_idx);
+                cmdbuf->bufsz -= sizeof(buf_idx);
+        }
+        
+        BEGIN_RING(2);
+        OUT_RING(CP_PACKET0(RADEON_SCRATCH_REG0 + header.scratch.reg * 4, 0));
+        OUT_RING(dev_priv->scratch_ages[header.scratch.reg]);
+        ADVANCE_RING();
+        
+        return 0;
+}
+
 /**
  * Parses and validates a user-supplied command buffer and emits appropriate
  * commands on the DMA ring buffer.
@@ -841,6 +899,15 @@ int r300_do_cp_cmdbuf(drm_device_t *dev,
                         }
                         break;
 
+                case R300_CMD_SCRATCH:
+                        DRM_DEBUG("R300_CMD_SCRATCH\n");
+                        ret = r300_scratch(dev_priv, cmdbuf, header);
+                        if (ret) {
+                                DRM_ERROR("r300_scratch failed\n");
+                                goto cleanup;
+                        }
+                        break;
+                        
                 default:
                         DRM_ERROR("bad cmd_type %i at %p\n",
                                   header.header.cmd_type,