mga driver, brought over by Jon Smirl

1 files changed, 693 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/mga/mgaioctl.c b/src/mesa/drivers/dri/mga/mgaioctl.c
new file mode 100644
index 00000000000..f88c8780607
--- /dev/null
+++ b/src/mesa/drivers/dri/mga/mgaioctl.c
@@ -0,0 +1,693 @@
+/*
+ * Copyright 2000-2001 VA Linux Systems, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Keith Whitwell <[email protected]>
+ *    Gareth Hughes <[email protected]>
+ */
+/* $XFree86: xc/lib/GL/mesa/src/drv/mga/mgaioctl.c,v 1.16 2002/12/16 16:18:52 dawes Exp $ */
+
+#include <stdio.h>
+#include <errno.h>
+
+#include "mtypes.h"
+#include "macros.h"
+#include "dd.h"
+#include "swrast/swrast.h"
+
+#include "mm.h"
+#include "mgacontext.h"
+#include "mgadd.h"
+#include "mgastate.h"
+#include "mgatex.h"
+#include "mgavb.h"
+#include "mgaioctl.h"
+#include "mgatris.h"
+#include "mgabuffers.h"
+
+
+#include "xf86drm.h"
+#include "mga_common.h"
+
+static void mga_iload_dma_ioctl(mgaContextPtr mmesa,
+				unsigned long dest,
+				int length)
+{
+   drmBufPtr buf = mmesa->iload_buffer;
+   drmMGAIload iload;
+   int ret, i;
+
+   if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+      fprintf(stderr, "DRM_IOCTL_MGA_ILOAD idx %d dst %x length %d\n",
+	      buf->idx, (int) dest, length);
+
+   iload.idx = buf->idx;
+   iload.dstorg = dest;
+   iload.length = length;
+
+   i = 0;
+   do {
+      ret = drmCommandWrite( mmesa->driFd, DRM_MGA_ILOAD, 
+                             &iload, sizeof(drmMGAIload) );
+   } while ( ret == -EBUSY && i++ < DRM_MGA_IDLE_RETRY );
+
+   if ( ret < 0 ) {
+      printf("send iload retcode = %d\n", ret);
+      exit(1);
+   }
+
+   mmesa->iload_buffer = 0;
+
+   if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+      fprintf(stderr, "finished iload dma put\n");
+
+}
+
+drmBufPtr mga_get_buffer_ioctl( mgaContextPtr mmesa )
+{
+   int idx = 0;
+   int size = 0;
+   drmDMAReq dma;
+   int retcode;
+   drmBufPtr buf;
+
+   if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+      fprintf(stderr,  "Getting dma buffer\n");
+
+   dma.context = mmesa->hHWContext;
+   dma.send_count = 0;
+   dma.send_list = NULL;
+   dma.send_sizes = NULL;
+   dma.flags = 0;
+   dma.request_count = 1;
+   dma.request_size = MGA_BUFFER_SIZE;
+   dma.request_list = &idx;
+   dma.request_sizes = &size;
+   dma.granted_count = 0;
+
+
+   if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+      fprintf(stderr, "drmDMA (get) ctx %d count %d size 0x%x\n",
+	   dma.context, dma.request_count,
+	   dma.request_size);
+
+   while (1) {
+      retcode = drmDMA(mmesa->driFd, &dma);
+
+      if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+	 fprintf(stderr, "retcode %d sz %d idx %d count %d\n",
+		 retcode,
+		 dma.request_sizes[0],
+		 dma.request_list[0],
+		 dma.granted_count);
+
+      if (retcode == 0 &&
+	  dma.request_sizes[0] &&
+	  dma.granted_count)
+	 break;
+
+      if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+	 fprintf(stderr, "\n\nflush");
+
+      UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH | DRM_LOCK_QUIESCENT );
+   }
+
+   buf = &(mmesa->mgaScreen->bufs->list[idx]);
+   buf->used = 0;
+
+   if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+      fprintf(stderr,
+	   "drmDMA (get) returns size[0] 0x%x idx[0] %d\n"
+	   "dma_buffer now: buf idx: %d size: %d used: %d addr %p\n",
+	   dma.request_sizes[0], dma.request_list[0],
+	   buf->idx, buf->total,
+	   buf->used, buf->address);
+
+   if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+      fprintf(stderr, "finished getbuffer\n");
+
+   return buf;
+}
+
+
+
+
+static void
+mgaDDClear( GLcontext *ctx, GLbitfield mask, GLboolean all,
+            GLint cx, GLint cy, GLint cw, GLint ch )
+{
+   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+   __DRIdrawablePrivate *dPriv = mmesa->driDrawable;
+   GLuint flags = 0;
+   GLuint clear_color = mmesa->ClearColor;
+   GLuint clear_depth = 0;
+   GLuint color_mask = 0;
+   GLuint depth_mask = 0;
+   int ret;
+   int i;
+   static int nrclears;
+   drmMGAClearRec clear;
+
+   FLUSH_BATCH( mmesa );
+
+   if ( mask & DD_FRONT_LEFT_BIT ) {
+      flags |= MGA_FRONT;
+      color_mask = mmesa->setup.plnwt;
+      mask &= ~DD_FRONT_LEFT_BIT;
+   }
+
+   if ( mask & DD_BACK_LEFT_BIT ) {
+      flags |= MGA_BACK;
+      color_mask = mmesa->setup.plnwt;
+      mask &= ~DD_BACK_LEFT_BIT;
+   }
+
+   if ( (mask & DD_DEPTH_BIT) && ctx->Depth.Mask ) {
+      flags |= MGA_DEPTH;
+      clear_depth = (mmesa->ClearDepth & mmesa->depth_clear_mask);
+      depth_mask |= mmesa->depth_clear_mask;
+      mask &= ~DD_DEPTH_BIT;
+   }
+
+   if ( (mask & DD_STENCIL_BIT) && mmesa->hw_stencil ) {
+      flags |= MGA_DEPTH;
+      clear_depth |= (ctx->Stencil.Clear & mmesa->stencil_clear_mask);
+      depth_mask |= mmesa->stencil_clear_mask;
+      mask &= ~DD_STENCIL_BIT;
+   }
+
+   if ( flags ) {
+      LOCK_HARDWARE( mmesa );
+
+      if ( mmesa->dirty_cliprects )
+	 mgaUpdateRects( mmesa, (MGA_FRONT | MGA_BACK) );
+
+      /* flip top to bottom */
+      cy = dPriv->h-cy-ch;
+      cx += mmesa->drawX;
+      cy += mmesa->drawY;
+
+      if ( MGA_DEBUG & DEBUG_VERBOSE_IOCTL )
+	 fprintf( stderr, "Clear, bufs %x nbox %d\n",
+		  (int)flags, (int)mmesa->numClipRects );
+
+      for (i = 0 ; i < mmesa->numClipRects ; )
+      {
+	 int nr = MIN2(i + MGA_NR_SAREA_CLIPRECTS, mmesa->numClipRects);
+	 XF86DRIClipRectPtr box = mmesa->pClipRects;
+	 XF86DRIClipRectPtr b = mmesa->sarea->boxes;
+	 int n = 0;
+
+	 if (!all) {
+	    for ( ; i < nr ; i++) {
+	       GLint x = box[i].x1;
+	       GLint y = box[i].y1;
+	       GLint w = box[i].x2 - x;
+	       GLint h = box[i].y2 - y;
+
+	       if (x < cx) w -= cx - x, x = cx;
+	       if (y < cy) h -= cy - y, y = cy;
+	       if (x + w > cx + cw) w = cx + cw - x;
+	       if (y + h > cy + ch) h = cy + ch - y;
+	       if (w <= 0) continue;
+	       if (h <= 0) continue;
+
+	       b->x1 = x;
+	       b->y1 = y;
+	       b->x2 = x + w;
+	       b->y2 = y + h;
+	       b++;
+	       n++;
+	    }
+	 } else {
+	    for ( ; i < nr ; i++) {
+	       *b++ = *(XF86DRIClipRectPtr)&box[i];
+	       n++;
+	    }
+	 }
+
+
+	 if ( MGA_DEBUG & DEBUG_VERBOSE_IOCTL )
+	    fprintf( stderr,
+		     "DRM_IOCTL_MGA_CLEAR flag 0x%x color %x depth %x nbox %d\n",
+		     flags, clear_color, clear_depth, mmesa->sarea->nbox );
+
+	 mmesa->sarea->nbox = n;
+
+         clear.flags = flags;
+         clear.clear_color = clear_color;
+         clear.clear_depth = clear_depth;
+         clear.color_mask = color_mask;
+         clear.depth_mask = depth_mask;
+         ret = drmCommandWrite( mmesa->driFd, DRM_MGA_CLEAR,
+                                 &clear, sizeof(drmMGAClearRec));
+	 if ( ret ) {
+	    fprintf( stderr, "send clear retcode = %d\n", ret );
+	    exit( 1 );
+	 }
+	 if ( MGA_DEBUG & DEBUG_VERBOSE_IOCTL )
+	    fprintf( stderr, "finished clear %d\n", ++nrclears );
+      }
+
+      UNLOCK_HARDWARE( mmesa );
+      mmesa->dirty |= MGA_UPLOAD_CLIPRECTS|MGA_UPLOAD_CONTEXT;
+   }
+
+   if (mask) 
+      _swrast_Clear( ctx, mask, all, cx, cy, cw, ch );
+}
+
+
+int nrswaps;
+
+
+void mgaWaitForVBlank( mgaContextPtr mmesa )
+{
+#if 0
+    drmVBlank vbl;
+    int ret;
+
+    if ( !mmesa->mgaScreen->irq )
+	return;
+
+    if ( getenv("LIBGL_SYNC_REFRESH") ) {
+	/* Wait for until the next vertical blank */
+	vbl.request.type = DRM_VBLANK_RELATIVE;
+	vbl.request.sequence = 1;
+    } else if ( getenv("LIBGL_THROTTLE_REFRESH") ) {
+	/* Wait for at least one vertical blank since the last call */
+	vbl.request.type = DRM_VBLANK_ABSOLUTE;
+	vbl.request.sequence = mmesa->vbl_seq + 1;
+    } else {
+	return;
+    }
+
+    if ((ret = drmWaitVBlank( mmesa->driFd, &vbl ))) {
+	fprintf(stderr, "%s: drmWaitVBlank returned %d, IRQs don't seem to be"
+		" working correctly.\nTry running with LIBGL_THROTTLE_REFRESH"
+		" and LIBL_SYNC_REFRESH unset.\n", __FUNCTION__, ret);
+	exit(1);
+    }
+
+    mmesa->vbl_seq = vbl.reply.sequence;
+#endif
+}
+
+
+/*
+ * Copy the back buffer to the front buffer.
+ */
+void mgaSwapBuffers(__DRIdrawablePrivate *dPriv)
+{
+   mgaContextPtr mmesa;
+   XF86DRIClipRectPtr pbox;
+   GLint nbox;
+   GLint ret, wait = 0;
+   GLint i;
+   GLuint last_frame, last_wrap;
+
+   assert(dPriv);
+   assert(dPriv->driContextPriv);
+   assert(dPriv->driContextPriv->driverPrivate);
+
+   mmesa = (mgaContextPtr) dPriv->driContextPriv->driverPrivate;
+
+   FLUSH_BATCH( mmesa );
+
+   mgaWaitForVBlank( mmesa );
+
+   LOCK_HARDWARE( mmesa );
+
+   last_frame = mmesa->sarea->last_frame.head;
+   last_wrap = mmesa->sarea->last_frame.wrap;
+
+   /* FIXME: Add a timeout to this loop...
+    */
+   while ( 1 ) {
+      if ( last_wrap < mmesa->sarea->last_wrap ||
+	   ( last_wrap == mmesa->sarea->last_wrap &&
+	     last_frame <= (MGA_READ( MGAREG_PRIMADDRESS ) -
+			    mmesa->primary_offset) ) ) {
+	 break;
+      }
+      if ( 0 ) {
+	 wait++;
+	 fprintf( stderr, "   last: head=0x%06x wrap=%d\n",
+		  last_frame, last_wrap );
+	 fprintf( stderr, "   head: head=0x%06lx wrap=%d\n",
+		  (long)(MGA_READ( MGAREG_PRIMADDRESS ) - mmesa->primary_offset),
+		  mmesa->sarea->last_wrap );
+      }
+      UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH );
+
+      for ( i = 0 ; i < 1024 ; i++ ) {
+	 /* Don't just hammer the register... */
+      }
+   }
+   if ( wait )
+      fprintf( stderr, "\n" );
+
+   /* Use the frontbuffer cliprects
+    */
+   if (mmesa->dirty_cliprects & MGA_FRONT)
+      mgaUpdateRects( mmesa, MGA_FRONT );
+
+
+   pbox = dPriv->pClipRects;
+   nbox = dPriv->numClipRects;
+
+   for (i = 0 ; i < nbox ; )
+   {
+      int nr = MIN2(i + MGA_NR_SAREA_CLIPRECTS, dPriv->numClipRects);
+      XF86DRIClipRectPtr b = mmesa->sarea->boxes;
+
+      mmesa->sarea->nbox = nr - i;
+
+      for ( ; i < nr ; i++)
+	 *b++ = pbox[i];
+
+      if (0)
+	 fprintf(stderr, "DRM_IOCTL_MGA_SWAP\n");
+
+      ret = drmCommandNone( mmesa->driFd, DRM_MGA_SWAP );
+      if ( ret ) {
+	 printf("send swap retcode = %d\n", ret);
+	 exit(1);
+      }
+   }
+
+   UNLOCK_HARDWARE( mmesa );
+
+   mmesa->dirty |= MGA_UPLOAD_CLIPRECTS;
+}
+
+
+/* This is overkill
+ */
+void mgaDDFinish( GLcontext *ctx  )
+{
+   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+
+   FLUSH_BATCH( mmesa );
+
+   if (1/*mmesa->sarea->last_quiescent != mmesa->sarea->last_enqueue*/) {
+      if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+	 fprintf(stderr, "mgaRegetLockQuiescent\n");
+
+      LOCK_HARDWARE( mmesa );
+      UPDATE_LOCK( mmesa, DRM_LOCK_QUIESCENT | DRM_LOCK_FLUSH );
+      UNLOCK_HARDWARE( mmesa );
+
+      mmesa->sarea->last_quiescent = mmesa->sarea->last_enqueue;
+   }
+}
+
+void mgaWaitAgeLocked( mgaContextPtr mmesa, int age  )
+{
+   if (GET_DISPATCH_AGE(mmesa) < age) {
+      UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH );
+   }
+}
+
+
+void mgaWaitAge( mgaContextPtr mmesa, int age  )
+{
+   if (GET_DISPATCH_AGE(mmesa) < age) {
+      LOCK_HARDWARE(mmesa);
+      if (GET_DISPATCH_AGE(mmesa) < age) {
+	 UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH );
+      }
+      UNLOCK_HARDWARE(mmesa);
+   }
+}
+
+
+static int intersect_rect( XF86DRIClipRectPtr out,
+			   XF86DRIClipRectPtr a,
+			   XF86DRIClipRectPtr b )
+{
+   *out = *a;
+   if (b->x1 > out->x1) out->x1 = b->x1;
+   if (b->y1 > out->y1) out->y1 = b->y1;
+   if (b->x2 < out->x2) out->x2 = b->x2;
+   if (b->y2 < out->y2) out->y2 = b->y2;
+   if (out->x1 > out->x2) return 0;
+   if (out->y1 > out->y2) return 0;
+   return 1;
+}
+
+
+
+
+static void age_mmesa( mgaContextPtr mmesa, int age )
+{
+   if (mmesa->CurrentTexObj[0]) mmesa->CurrentTexObj[0]->age = age;
+   if (mmesa->CurrentTexObj[1]) mmesa->CurrentTexObj[1]->age = age;
+}
+
+#ifdef __i386__
+static int __break_vertex = 0;
+#endif
+
+void mgaFlushVerticesLocked( mgaContextPtr mmesa )
+{
+   XF86DRIClipRectPtr pbox = mmesa->pClipRects;
+   int nbox = mmesa->numClipRects;
+   drmBufPtr buffer = mmesa->vertex_dma_buffer;
+   drmMGAVertex vertex;
+   int i;
+
+   mmesa->vertex_dma_buffer = 0;
+
+   if (!buffer)
+      return;
+
+   if (mmesa->dirty_cliprects & mmesa->draw_buffer)
+      mgaUpdateRects( mmesa, mmesa->draw_buffer );
+
+   if (mmesa->dirty & ~MGA_UPLOAD_CLIPRECTS)
+      mgaEmitHwStateLocked( mmesa );
+
+   /* FIXME: Workaround bug in kernel module.
+    */
+   mmesa->sarea->dirty |= MGA_UPLOAD_CONTEXT;
+
+   if (!nbox)
+      buffer->used = 0;
+
+   if (nbox >= MGA_NR_SAREA_CLIPRECTS)
+      mmesa->dirty |= MGA_UPLOAD_CLIPRECTS;
+
+#if 0
+   if (!buffer->used || !(mmesa->dirty & MGA_UPLOAD_CLIPRECTS))
+   {
+      if (nbox == 1)
+	 mmesa->sarea->nbox = 0;
+      else
+	 mmesa->sarea->nbox = nbox;
+
+      if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+	 fprintf(stderr, "Firing vertex -- case a nbox %d\n", nbox);
+
+      vertex.idx = buffer->idx;
+      vertex.used = buffer->used;
+      vertex.discard = 1;
+      drmCommandWrite( mmesa->driFd, DRM_MGA_VERTEX, 
+                       &vertex, sizeof(drmMGAVertex) );
+
+      age_mmesa(mmesa, mmesa->sarea->last_enqueue);
+   }
+   else
+#endif
+   {
+      for (i = 0 ; i < nbox ; )
+      {
+	 int nr = MIN2(i + MGA_NR_SAREA_CLIPRECTS, nbox);
+	 XF86DRIClipRectPtr b = mmesa->sarea->boxes;
+	 int discard = 0;
+
+	 if (mmesa->scissor) {
+	    mmesa->sarea->nbox = 0;
+
+	    for ( ; i < nr ; i++) {
+	       *b = pbox[i];
+	       if (intersect_rect(b, b, &mmesa->scissor_rect)) {
+		  mmesa->sarea->nbox++;
+		  b++;
+	       }
+	    }
+
+	    /* Culled?
+	     */
+	    if (!mmesa->sarea->nbox) {
+	       if (nr < nbox) continue;
+	       buffer->used = 0;
+	    }
+	 } else {
+	    mmesa->sarea->nbox = nr - i;
+	    for ( ; i < nr ; i++)
+	       *b++ = pbox[i];
+	 }
+
+	 /* Finished with the buffer?
+	  */
+	 if (nr == nbox)
+	    discard = 1;
+
+	 mmesa->sarea->dirty |= MGA_UPLOAD_CLIPRECTS;
+
+         vertex.idx = buffer->idx;
+         vertex.used = buffer->used;
+         vertex.discard = discard;
+         drmCommandWrite( mmesa->driFd, DRM_MGA_VERTEX, 
+                          &vertex, sizeof(drmMGAVertex) );
+
+	 age_mmesa(mmesa, mmesa->sarea->last_enqueue);
+      }
+   }
+
+   /* Do we really need to do this ? */
+#ifdef __i386__
+   if ( __break_vertex ) {
+      __asm__ __volatile__ ( "int $3" );
+   }
+#endif
+
+   mmesa->dirty &= ~MGA_UPLOAD_CLIPRECTS;
+}
+
+void mgaFlushVertices( mgaContextPtr mmesa )
+{
+   LOCK_HARDWARE( mmesa );
+   mgaFlushVerticesLocked( mmesa );
+   UNLOCK_HARDWARE( mmesa );
+}
+
+
+void mgaFireILoadLocked( mgaContextPtr mmesa,
+			 GLuint offset, GLuint length )
+{
+   if (!mmesa->iload_buffer) {
+      fprintf(stderr, "mgaFireILoad: no buffer\n");
+      return;
+   }
+
+   if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+      fprintf(stderr, "mgaFireILoad idx %d ofs 0x%x length %d\n",
+	      mmesa->iload_buffer->idx, (int)offset, (int)length );
+
+   mga_iload_dma_ioctl( mmesa, offset, length );
+}
+
+void mgaGetILoadBufferLocked( mgaContextPtr mmesa )
+{
+   if (MGA_DEBUG&DEBUG_VERBOSE_IOCTL)
+      fprintf(stderr, "mgaGetIloadBuffer (buffer now %p)\n",
+	   mmesa->iload_buffer);
+
+   mmesa->iload_buffer = mga_get_buffer_ioctl( mmesa );
+}
+
+drmBufPtr mgaGetBufferLocked( mgaContextPtr mmesa )
+{
+   return mga_get_buffer_ioctl( mmesa );
+}
+
+
+
+void mgaDDFlush( GLcontext *ctx )
+{
+   mgaContextPtr mmesa = MGA_CONTEXT( ctx );
+
+
+   FLUSH_BATCH( mmesa );
+
+   /* This may be called redundantly - dispatch_age may trail what
+    * has actually been sent and processed by the hardware.
+    */
+   if (1 || GET_DISPATCH_AGE( mmesa ) < mmesa->sarea->last_enqueue) {
+      LOCK_HARDWARE( mmesa );
+      UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH );
+      UNLOCK_HARDWARE( mmesa );
+   }
+}
+
+
+
+
+void mgaReleaseBufLocked( mgaContextPtr mmesa, drmBufPtr buffer )
+{
+   drmMGAVertex vertex;
+
+   if (!buffer) return;
+
+   vertex.idx = buffer->idx;
+   vertex.used = 0;
+   vertex.discard = 1;
+   drmCommandWrite( mmesa->driFd, DRM_MGA_VERTEX, 
+                    &vertex, sizeof(drmMGAVertex) );
+}
+
+int mgaFlushDMA( int fd, drmLockFlags flags )
+{
+   drmMGALock lock;
+   int ret, i = 0;
+
+   memset( &lock, 0, sizeof(drmMGALock) );
+
+   if ( flags & DRM_LOCK_QUIESCENT )    lock.flags |= DRM_LOCK_QUIESCENT;
+   if ( flags & DRM_LOCK_FLUSH )        lock.flags |= DRM_LOCK_FLUSH;
+   if ( flags & DRM_LOCK_FLUSH_ALL )    lock.flags |= DRM_LOCK_FLUSH_ALL;
+
+   do {
+      ret = drmCommandWrite( fd, DRM_MGA_FLUSH, &lock, sizeof(drmMGALock) );
+   } while ( ret && errno == EBUSY && i++ < DRM_MGA_IDLE_RETRY );
+
+   if ( ret == 0 )
+      return 0;
+   if ( errno != EBUSY )
+      return -errno;
+
+   if ( lock.flags & DRM_LOCK_QUIESCENT ) {
+      /* Only keep trying if we need quiescence.
+       */
+      lock.flags &= ~(DRM_LOCK_FLUSH | DRM_LOCK_FLUSH_ALL);
+
+      do {
+         ret = drmCommandWrite( fd, DRM_MGA_FLUSH, &lock, sizeof(drmMGALock) );
+      } while ( ret && errno == EBUSY && i++ < DRM_MGA_IDLE_RETRY );
+   }
+
+   if ( ret == 0 ) {
+      return 0;
+   } else {
+      return -errno;
+   }
+}
+
+void mgaDDInitIoctlFuncs( GLcontext *ctx )
+{
+   ctx->Driver.Clear = mgaDDClear;
+   ctx->Driver.Flush = mgaDDFlush;
+   ctx->Driver.Finish = mgaDDFinish;
+}