don't wait in radeon_freelist_get

bsd/gamma_drm.h

@@ -0,0 +1,89 @@
+#ifndef _GAMMA_DRM_H_
+#define _GAMMA_DRM_H_
+
+typedef struct _drm_gamma_tex_region {
+	unsigned char next, prev; /* indices to form a circular LRU  */
+	unsigned char in_use;	/* owned by a client, or free? */
+	int age;		/* tracked by clients to update local LRU's */
+} drm_gamma_tex_region_t;
+
+typedef struct {
+	unsigned int	GDeltaMode;
+	unsigned int	GDepthMode;
+	unsigned int	GGeometryMode;
+	unsigned int	GTransformMode;
+} drm_gamma_context_regs_t;
+
+typedef struct _drm_gamma_sarea {
+   	drm_gamma_context_regs_t context_state;
+
+	unsigned int dirty;
+
+
+	/* Maintain an LRU of contiguous regions of texture space.  If
+	 * you think you own a region of texture memory, and it has an
+	 * age different to the one you set, then you are mistaken and
+	 * it has been stolen by another client.  If global texAge
+	 * hasn't changed, there is no need to walk the list.
+	 *
+	 * These regions can be used as a proxy for the fine-grained
+	 * texture information of other clients - by maintaining them
+	 * in the same lru which is used to age their own textures,
+	 * clients have an approximate lru for the whole of global
+	 * texture space, and can make informed decisions as to which
+	 * areas to kick out.  There is no need to choose whether to
+	 * kick out your own texture or someone else's - simply eject
+	 * them all in LRU order.  
+	 */
+   
+#define GAMMA_NR_TEX_REGIONS 64
+	drm_gamma_tex_region_t texList[GAMMA_NR_TEX_REGIONS+1]; 
+				/* Last elt is sentinal */
+        int texAge;		/* last time texture was uploaded */
+        int last_enqueue;	/* last time a buffer was enqueued */
+	int last_dispatch;	/* age of the most recently dispatched buffer */
+	int last_quiescent;     /*  */
+	int ctxOwner;		/* last context to upload state */
+
+	int vertex_prim;
+} drm_gamma_sarea_t;
+
+/* WARNING: If you change any of these defines, make sure to change the
+ * defines in the Xserver file (xf86drmGamma.h)
+ */
+
+/* Gamma specific ioctls
+ * The device specific ioctl range is 0x40 to 0x79.
+ */
+#define DRM_IOCTL_GAMMA_INIT		DRM_IOW( 0x40, drm_gamma_init_t)
+#define DRM_IOCTL_GAMMA_COPY		DRM_IOW( 0x41, drm_gamma_copy_t)
+
+typedef struct drm_gamma_copy {
+	unsigned int	DMAOutputAddress;
+	unsigned int	DMAOutputCount;
+	unsigned int	DMAReadGLINTSource;
+	unsigned int	DMARectangleWriteAddress;
+	unsigned int	DMARectangleWriteLinePitch;
+	unsigned int	DMARectangleWrite;
+	unsigned int	DMARectangleReadAddress;
+	unsigned int	DMARectangleReadLinePitch;
+	unsigned int	DMARectangleRead;
+	unsigned int	DMARectangleReadTarget;
+} drm_gamma_copy_t;
+
+typedef struct drm_gamma_init {
+   	enum {
+	   	GAMMA_INIT_DMA    = 0x01,
+	       	GAMMA_CLEANUP_DMA = 0x02
+	} func;
+
+   	int sarea_priv_offset;
+	int pcimode;
+	unsigned int mmio0;
+	unsigned int mmio1;
+	unsigned int mmio2;
+	unsigned int mmio3;
+	unsigned int buffers_offset;
+} drm_gamma_init_t;
+
+#endif /* _GAMMA_DRM_H_ */

linux/radeon_cp.c

@@ -1220,30 +1220,28 @@ drm_buf_t *radeon_freelist_get( drm_device_t *dev )
 	drm_radeon_private_t *dev_priv = dev->dev_private;
 	drm_radeon_buf_priv_t *buf_priv;
 	drm_buf_t *buf;
-	int i, t;
+	int i;
 	int start;
+	u32 done_age = RADEON_READ( RADEON_LAST_DISPATCH_REG );
 
 	if ( ++dev_priv->last_buf >= dma->buf_count )
 		dev_priv->last_buf = 0;
 
 	start = dev_priv->last_buf;
 
-	for ( t = 0 ; t < dev_priv->usec_timeout ; t++ ) {
-		u32 done_age = RADEON_READ( RADEON_LAST_DISPATCH_REG );
-		for ( i = start ; i < dma->buf_count ; i++ ) {
-			buf = dma->buflist[i];
-			buf_priv = buf->dev_private;
-			if ( buf->pid == 0 || (buf->pending && 
-					       buf_priv->age <= done_age) ) {
-				buf->pending = 0;
-				return buf;
-			}
-			start = 0;
+	for ( i = start ; i < dma->buf_count ; i++ ) {
+		buf = dma->buflist[i];
+		buf_priv = buf->dev_private;
+		if ( buf->pid == 0 || (buf->pending && 
+				       buf_priv->age <= done_age) ) {
+			buf->pending = 0;
+			return buf;
 		}
-		udelay( 1 );
+		start = 0;
 	}
 
-	DRM_ERROR( "returning NULL!\n" );
+	/* It's not really an error for this to fail.
+	 */
 	return NULL;
 }