From b3fdf9bb7acd023060e0dba07d3b439c3b64faef Mon Sep 17 00:00:00 2001
From: Aapo Tahkola <aet@rasterburn.org>
Date: Mon, 6 Mar 2006 20:08:50 +0000
Subject: Add general-purpose packet for manipulating scratch registers (r300)

---
 shared-core/r300_cmdbuf.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++
 shared-core/radeon_drm.h  |  4 +++
 shared-core/radeon_drv.h  |  5 +++-
 3 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/shared-core/r300_cmdbuf.c b/shared-core/r300_cmdbuf.c
index 9af5c073..988734cf 100644
--- a/shared-core/r300_cmdbuf.c
+++ b/shared-core/r300_cmdbuf.c
@@ -702,6 +702,63 @@ static void r300_discard_buffer(drm_device_t * dev, drm_buf_t * buf)
 	buf->used = 0;
 }
 
+static __inline__ 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(u32 *) + 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(u32 *);
+	cmdbuf->bufsz -= sizeof(u32 *);
+	
+	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.
@@ -839,6 +896,15 @@ 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,
diff --git a/shared-core/radeon_drm.h b/shared-core/radeon_drm.h
index 62b82f22..601b22bb 100644
--- a/shared-core/radeon_drm.h
+++ b/shared-core/radeon_drm.h
@@ -222,6 +222,7 @@ typedef union {
 #	define R300_WAIT_3D  		0x2
 #	define R300_WAIT_2D_CLEAN  	0x3
 #	define R300_WAIT_3D_CLEAN  	0x4
+#define R300_CMD_SCRATCH		8
 
 typedef union {
 	unsigned int u;
@@ -247,6 +248,9 @@ typedef union {
 	struct {
 		unsigned char cmd_type, flags, pad0, pad1;
 	} wait;
+	struct {
+		unsigned char cmd_type, reg, n_bufs, flags;
+	} scratch;
 } drm_r300_cmd_header_t;
 
 #define RADEON_FRONT			0x1
diff --git a/shared-core/radeon_drv.h b/shared-core/radeon_drv.h
index 51d91578..af8c0a72 100644
--- a/shared-core/radeon_drv.h
+++ b/shared-core/radeon_drv.h
@@ -91,10 +91,11 @@
  * 1.21- Add support for card type getparam
  * 1.22- Add support for texture cache flushes (R300_TX_CNTL)
  * 1.23- Add new radeon memory map work from benh
+ * 1.24- Add general-purpose packet for manipulating scratch registers (r300)
  */
 
 #define DRIVER_MAJOR		1
-#define DRIVER_MINOR		23
+#define DRIVER_MINOR		24
 #define DRIVER_PATCHLEVEL	0
 
 enum radeon_family {
@@ -277,6 +278,8 @@ typedef struct drm_radeon_private {
 	/* starting from here on, data is preserved accross an open */
 	uint32_t flags;		/* see radeon_chip_flags */
 
+	u32 scratch_ages[5];
+
 } drm_radeon_private_t;
 
 typedef struct drm_radeon_buf_priv {
-- 
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