drm: Add general-purpose packet for manipulating scratch registers (r300)
From: Aapo Tahkola (via DRM CVS)
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/r300_cmdbuf.c b/drivers/char/drm/r300_cmdbuf.c
index 20b6cb3..b108c7f91 100644
--- a/drivers/char/drm/r300_cmdbuf.c
+++ b/drivers/char/drm/r300_cmdbuf.c
@@ -704,6 +704,64 @@
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 @@
}
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,