1 /* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
2 * Created: Mon Dec 13 01:50:01 1999 by jhartmann@precisioninsight.com
4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
28 * Rickard E. (Rik) Faith <faith@valinux.com>
29 * Jeff Hartmann <jhartmann@valinux.com>
30 * Keith Whitwell <keith@tungstengraphics.com>
33 * Gareth Hughes <gareth@valinux.com>
35 * $FreeBSD: src/sys/dev/drm/mga_dma.c,v 1.6.2.1 2003/04/26 07:05:29 anholt Exp $
36 * $DragonFly: src/sys/dev/drm/mga/Attic/mga_dma.c,v 1.3 2003/08/07 21:16:55 dillon Exp $
40 #include "dev/drm/drmP.h"
41 #include "dev/drm/drm.h"
45 #define MGA_DEFAULT_USEC_TIMEOUT 10000
46 #define MGA_FREELIST_DEBUG 0
49 /* ================================================================
53 int mga_do_wait_for_idle( drm_mga_private_t *dev_priv )
59 for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
60 status = MGA_READ( MGA_STATUS ) & MGA_ENGINE_IDLE_MASK;
61 if ( status == MGA_ENDPRDMASTS ) {
62 MGA_WRITE8( MGA_CRTC_INDEX, 0 );
69 DRM_ERROR( "failed!\n" );
70 DRM_INFO( " status=0x%08x\n", status );
72 return DRM_ERR(EBUSY);
75 int mga_do_dma_idle( drm_mga_private_t *dev_priv )
81 for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
82 status = MGA_READ( MGA_STATUS ) & MGA_DMA_IDLE_MASK;
83 if ( status == MGA_ENDPRDMASTS ) return 0;
88 DRM_ERROR( "failed! status=0x%08x\n", status );
90 return DRM_ERR(EBUSY);
93 int mga_do_dma_reset( drm_mga_private_t *dev_priv )
95 drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
96 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
100 /* The primary DMA stream should look like new right about now.
103 primary->space = primary->size;
104 primary->last_flush = 0;
106 sarea_priv->last_wrap = 0;
108 /* FIXME: Reset counters, buffer ages etc...
111 /* FIXME: What else do we need to reinitialize? WARP stuff?
117 int mga_do_engine_reset( drm_mga_private_t *dev_priv )
121 /* Okay, so we've completely screwed up and locked the engine.
122 * How about we clean up after ourselves?
124 MGA_WRITE( MGA_RST, MGA_SOFTRESET );
125 DRM_UDELAY( 15 ); /* Wait at least 10 usecs */
126 MGA_WRITE( MGA_RST, 0 );
128 /* Initialize the registers that get clobbered by the soft
129 * reset. Many of the core register values survive a reset,
130 * but the drawing registers are basically all gone.
132 * 3D clients should probably die after calling this. The X
133 * server should reset the engine state to known values.
136 MGA_WRITE( MGA_PRIMPTR,
137 virt_to_bus((void *)dev_priv->prim.status_page) |
142 MGA_WRITE( MGA_ICLEAR, MGA_SOFTRAPICLR );
143 MGA_WRITE( MGA_IEN, MGA_SOFTRAPIEN );
145 /* The primary DMA stream should look like new right about now.
147 mga_do_dma_reset( dev_priv );
149 /* This bad boy will never fail.
155 /* ================================================================
159 void mga_do_dma_flush( drm_mga_private_t *dev_priv )
161 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
168 /* We need to wait so that we can do an safe flush */
169 for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
170 status = MGA_READ( MGA_STATUS ) & MGA_ENGINE_IDLE_MASK;
171 if ( status == MGA_ENDPRDMASTS ) break;
175 if ( primary->tail == primary->last_flush ) {
176 DRM_DEBUG( " bailing out...\n" );
180 tail = primary->tail + dev_priv->primary->offset;
182 /* We need to pad the stream between flushes, as the card
183 * actually (partially?) reads the first of these commands.
184 * See page 4-16 in the G400 manual, middle of the page or so.
188 DMA_BLOCK( MGA_DMAPAD, 0x00000000,
189 MGA_DMAPAD, 0x00000000,
190 MGA_DMAPAD, 0x00000000,
191 MGA_DMAPAD, 0x00000000 );
195 primary->last_flush = primary->tail;
197 head = MGA_READ( MGA_PRIMADDRESS );
199 if ( head <= tail ) {
200 primary->space = primary->size - primary->tail;
202 primary->space = head - tail;
205 DRM_DEBUG( " head = 0x%06lx\n", head - dev_priv->primary->offset );
206 DRM_DEBUG( " tail = 0x%06lx\n", tail - dev_priv->primary->offset );
207 DRM_DEBUG( " space = 0x%06x\n", primary->space );
209 mga_flush_write_combine();
210 MGA_WRITE( MGA_PRIMEND, tail | MGA_PAGPXFER );
212 DRM_DEBUG( "done.\n" );
215 void mga_do_dma_wrap_start( drm_mga_private_t *dev_priv )
217 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
224 DMA_BLOCK( MGA_DMAPAD, 0x00000000,
225 MGA_DMAPAD, 0x00000000,
226 MGA_DMAPAD, 0x00000000,
227 MGA_DMAPAD, 0x00000000 );
231 tail = primary->tail + dev_priv->primary->offset;
234 primary->last_flush = 0;
235 primary->last_wrap++;
237 head = MGA_READ( MGA_PRIMADDRESS );
239 if ( head == dev_priv->primary->offset ) {
240 primary->space = primary->size;
242 primary->space = head - dev_priv->primary->offset;
245 DRM_DEBUG( " head = 0x%06lx\n",
246 head - dev_priv->primary->offset );
247 DRM_DEBUG( " tail = 0x%06x\n", primary->tail );
248 DRM_DEBUG( " wrap = %d\n", primary->last_wrap );
249 DRM_DEBUG( " space = 0x%06x\n", primary->space );
251 mga_flush_write_combine();
252 MGA_WRITE( MGA_PRIMEND, tail | MGA_PAGPXFER );
254 set_bit( 0, &primary->wrapped );
255 DRM_DEBUG( "done.\n" );
258 void mga_do_dma_wrap_end( drm_mga_private_t *dev_priv )
260 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
261 drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
262 u32 head = dev_priv->primary->offset;
265 sarea_priv->last_wrap++;
266 DRM_DEBUG( " wrap = %d\n", sarea_priv->last_wrap );
268 mga_flush_write_combine();
269 MGA_WRITE( MGA_PRIMADDRESS, head | MGA_DMA_GENERAL );
271 clear_bit( 0, &primary->wrapped );
272 DRM_DEBUG( "done.\n" );
276 /* ================================================================
277 * Freelist management
280 #define MGA_BUFFER_USED ~0
281 #define MGA_BUFFER_FREE 0
283 #if MGA_FREELIST_DEBUG
284 static void mga_freelist_print( drm_device_t *dev )
286 drm_mga_private_t *dev_priv = dev->dev_private;
287 drm_mga_freelist_t *entry;
290 DRM_INFO( "current dispatch: last=0x%x done=0x%x\n",
291 dev_priv->sarea_priv->last_dispatch,
292 (unsigned int)(MGA_READ( MGA_PRIMADDRESS ) -
293 dev_priv->primary->offset) );
294 DRM_INFO( "current freelist:\n" );
296 for ( entry = dev_priv->head->next ; entry ; entry = entry->next ) {
297 DRM_INFO( " %p idx=%2d age=0x%x 0x%06lx\n",
298 entry, entry->buf->idx, entry->age.head,
299 entry->age.head - dev_priv->primary->offset );
305 static int mga_freelist_init( drm_device_t *dev, drm_mga_private_t *dev_priv )
307 drm_device_dma_t *dma = dev->dma;
309 drm_mga_buf_priv_t *buf_priv;
310 drm_mga_freelist_t *entry;
312 DRM_DEBUG( "count=%d\n", dma->buf_count );
314 dev_priv->head = DRM(alloc)( sizeof(drm_mga_freelist_t),
316 if ( dev_priv->head == NULL )
317 return DRM_ERR(ENOMEM);
319 memset( dev_priv->head, 0, sizeof(drm_mga_freelist_t) );
320 SET_AGE( &dev_priv->head->age, MGA_BUFFER_USED, 0 );
322 for ( i = 0 ; i < dma->buf_count ; i++ ) {
323 buf = dma->buflist[i];
324 buf_priv = buf->dev_private;
326 entry = DRM(alloc)( sizeof(drm_mga_freelist_t),
329 return DRM_ERR(ENOMEM);
331 memset( entry, 0, sizeof(drm_mga_freelist_t) );
333 entry->next = dev_priv->head->next;
334 entry->prev = dev_priv->head;
335 SET_AGE( &entry->age, MGA_BUFFER_FREE, 0 );
338 if ( dev_priv->head->next != NULL )
339 dev_priv->head->next->prev = entry;
340 if ( entry->next == NULL )
341 dev_priv->tail = entry;
343 buf_priv->list_entry = entry;
344 buf_priv->discard = 0;
345 buf_priv->dispatched = 0;
347 dev_priv->head->next = entry;
353 static void mga_freelist_cleanup( drm_device_t *dev )
355 drm_mga_private_t *dev_priv = dev->dev_private;
356 drm_mga_freelist_t *entry;
357 drm_mga_freelist_t *next;
360 entry = dev_priv->head;
363 DRM(free)( entry, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER );
367 dev_priv->head = dev_priv->tail = NULL;
371 /* FIXME: Still needed?
373 static void mga_freelist_reset( drm_device_t *dev )
375 drm_device_dma_t *dma = dev->dma;
377 drm_mga_buf_priv_t *buf_priv;
380 for ( i = 0 ; i < dma->buf_count ; i++ ) {
381 buf = dma->buflist[i];
382 buf_priv = buf->dev_private;
383 SET_AGE( &buf_priv->list_entry->age,
384 MGA_BUFFER_FREE, 0 );
389 static drm_buf_t *mga_freelist_get( drm_device_t *dev )
391 drm_mga_private_t *dev_priv = dev->dev_private;
392 drm_mga_freelist_t *next;
393 drm_mga_freelist_t *prev;
394 drm_mga_freelist_t *tail = dev_priv->tail;
398 head = MGA_READ( MGA_PRIMADDRESS );
399 wrap = dev_priv->sarea_priv->last_wrap;
401 DRM_DEBUG( " tail=0x%06lx %d\n",
403 tail->age.head - dev_priv->primary->offset : 0,
405 DRM_DEBUG( " head=0x%06lx %d\n",
406 head - dev_priv->primary->offset, wrap );
408 if ( TEST_AGE( &tail->age, head, wrap ) ) {
409 prev = dev_priv->tail->prev;
410 next = dev_priv->tail;
412 next->prev = next->next = NULL;
413 dev_priv->tail = prev;
414 SET_AGE( &next->age, MGA_BUFFER_USED, 0 );
418 DRM_DEBUG( "returning NULL!\n" );
422 int mga_freelist_put( drm_device_t *dev, drm_buf_t *buf )
424 drm_mga_private_t *dev_priv = dev->dev_private;
425 drm_mga_buf_priv_t *buf_priv = buf->dev_private;
426 drm_mga_freelist_t *head, *entry, *prev;
428 DRM_DEBUG( "age=0x%06lx wrap=%d\n",
429 buf_priv->list_entry->age.head -
430 dev_priv->primary->offset,
431 buf_priv->list_entry->age.wrap );
433 entry = buf_priv->list_entry;
434 head = dev_priv->head;
436 if ( buf_priv->list_entry->age.head == MGA_BUFFER_USED ) {
437 SET_AGE( &entry->age, MGA_BUFFER_FREE, 0 );
438 prev = dev_priv->tail;
454 /* ================================================================
455 * DMA initialization, cleanup
458 static int mga_do_init_dma( drm_device_t *dev, drm_mga_init_t *init )
460 drm_mga_private_t *dev_priv;
464 dev_priv = DRM(alloc)( sizeof(drm_mga_private_t), DRM_MEM_DRIVER );
466 return DRM_ERR(ENOMEM);
468 memset( dev_priv, 0, sizeof(drm_mga_private_t) );
470 dev_priv->chipset = init->chipset;
472 dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
475 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
477 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
479 dev_priv->maccess = init->maccess;
481 dev_priv->fb_cpp = init->fb_cpp;
482 dev_priv->front_offset = init->front_offset;
483 dev_priv->front_pitch = init->front_pitch;
484 dev_priv->back_offset = init->back_offset;
485 dev_priv->back_pitch = init->back_pitch;
487 dev_priv->depth_cpp = init->depth_cpp;
488 dev_priv->depth_offset = init->depth_offset;
489 dev_priv->depth_pitch = init->depth_pitch;
491 /* FIXME: Need to support AGP textures...
493 dev_priv->texture_offset = init->texture_offset[0];
494 dev_priv->texture_size = init->texture_size[0];
498 if(!dev_priv->sarea) {
499 DRM_ERROR( "failed to find sarea!\n" );
500 /* Assign dev_private so we can do cleanup. */
501 dev->dev_private = (void *)dev_priv;
502 mga_do_cleanup_dma( dev );
503 return DRM_ERR(EINVAL);
506 DRM_FIND_MAP( dev_priv->fb, init->fb_offset );
508 DRM_ERROR( "failed to find framebuffer!\n" );
509 /* Assign dev_private so we can do cleanup. */
510 dev->dev_private = (void *)dev_priv;
511 mga_do_cleanup_dma( dev );
512 return DRM_ERR(EINVAL);
514 DRM_FIND_MAP( dev_priv->mmio, init->mmio_offset );
515 if(!dev_priv->mmio) {
516 DRM_ERROR( "failed to find mmio region!\n" );
517 /* Assign dev_private so we can do cleanup. */
518 dev->dev_private = (void *)dev_priv;
519 mga_do_cleanup_dma( dev );
520 return DRM_ERR(EINVAL);
522 DRM_FIND_MAP( dev_priv->status, init->status_offset );
523 if(!dev_priv->status) {
524 DRM_ERROR( "failed to find status page!\n" );
525 /* Assign dev_private so we can do cleanup. */
526 dev->dev_private = (void *)dev_priv;
527 mga_do_cleanup_dma( dev );
528 return DRM_ERR(EINVAL);
531 DRM_FIND_MAP( dev_priv->warp, init->warp_offset );
532 if(!dev_priv->warp) {
533 DRM_ERROR( "failed to find warp microcode region!\n" );
534 /* Assign dev_private so we can do cleanup. */
535 dev->dev_private = (void *)dev_priv;
536 mga_do_cleanup_dma( dev );
537 return DRM_ERR(EINVAL);
539 DRM_FIND_MAP( dev_priv->primary, init->primary_offset );
540 if(!dev_priv->primary) {
541 DRM_ERROR( "failed to find primary dma region!\n" );
542 /* Assign dev_private so we can do cleanup. */
543 dev->dev_private = (void *)dev_priv;
544 mga_do_cleanup_dma( dev );
545 return DRM_ERR(EINVAL);
547 DRM_FIND_MAP( dev_priv->buffers, init->buffers_offset );
548 if(!dev_priv->buffers) {
549 DRM_ERROR( "failed to find dma buffer region!\n" );
550 /* Assign dev_private so we can do cleanup. */
551 dev->dev_private = (void *)dev_priv;
552 mga_do_cleanup_dma( dev );
553 return DRM_ERR(EINVAL);
556 dev_priv->sarea_priv =
557 (drm_mga_sarea_t *)((u8 *)dev_priv->sarea->handle +
558 init->sarea_priv_offset);
560 DRM_IOREMAP( dev_priv->warp );
561 DRM_IOREMAP( dev_priv->primary );
562 DRM_IOREMAP( dev_priv->buffers );
564 if(!dev_priv->warp->handle ||
565 !dev_priv->primary->handle ||
566 !dev_priv->buffers->handle ) {
567 DRM_ERROR( "failed to ioremap agp regions!\n" );
568 /* Assign dev_private so we can do cleanup. */
569 dev->dev_private = (void *)dev_priv;
570 mga_do_cleanup_dma( dev );
571 return DRM_ERR(ENOMEM);
574 ret = mga_warp_install_microcode( dev_priv );
576 DRM_ERROR( "failed to install WARP ucode!\n" );
577 /* Assign dev_private so we can do cleanup. */
578 dev->dev_private = (void *)dev_priv;
579 mga_do_cleanup_dma( dev );
583 ret = mga_warp_init( dev_priv );
585 DRM_ERROR( "failed to init WARP engine!\n" );
586 /* Assign dev_private so we can do cleanup. */
587 dev->dev_private = (void *)dev_priv;
588 mga_do_cleanup_dma( dev );
592 dev_priv->prim.status = (u32 *)dev_priv->status->handle;
594 mga_do_wait_for_idle( dev_priv );
596 /* Init the primary DMA registers.
598 MGA_WRITE( MGA_PRIMADDRESS,
599 dev_priv->primary->offset | MGA_DMA_GENERAL );
601 MGA_WRITE( MGA_PRIMPTR,
602 virt_to_bus((void *)dev_priv->prim.status) |
603 MGA_PRIMPTREN0 | /* Soft trap, SECEND, SETUPEND */
604 MGA_PRIMPTREN1 ); /* DWGSYNC */
607 dev_priv->prim.start = (u8 *)dev_priv->primary->handle;
608 dev_priv->prim.end = ((u8 *)dev_priv->primary->handle
609 + dev_priv->primary->size);
610 dev_priv->prim.size = dev_priv->primary->size;
612 dev_priv->prim.tail = 0;
613 dev_priv->prim.space = dev_priv->prim.size;
614 dev_priv->prim.wrapped = 0;
616 dev_priv->prim.last_flush = 0;
617 dev_priv->prim.last_wrap = 0;
619 dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
621 dev_priv->prim.status[0] = dev_priv->primary->offset;
622 dev_priv->prim.status[1] = 0;
624 dev_priv->sarea_priv->last_wrap = 0;
625 dev_priv->sarea_priv->last_frame.head = 0;
626 dev_priv->sarea_priv->last_frame.wrap = 0;
628 if ( mga_freelist_init( dev, dev_priv ) < 0 ) {
629 DRM_ERROR( "could not initialize freelist\n" );
630 /* Assign dev_private so we can do cleanup. */
631 dev->dev_private = (void *)dev_priv;
632 mga_do_cleanup_dma( dev );
633 return DRM_ERR(ENOMEM);
636 /* Make dev_private visable to others. */
637 dev->dev_private = (void *)dev_priv;
641 int mga_do_cleanup_dma( drm_device_t *dev )
645 if ( dev->dev_private ) {
646 drm_mga_private_t *dev_priv = dev->dev_private;
648 if ( dev_priv->warp != NULL )
649 DRM_IOREMAPFREE( dev_priv->warp );
650 if ( dev_priv->primary != NULL )
651 DRM_IOREMAPFREE( dev_priv->primary );
652 if ( dev_priv->buffers != NULL )
653 DRM_IOREMAPFREE( dev_priv->buffers );
655 if ( dev_priv->head != NULL ) {
656 mga_freelist_cleanup( dev );
659 DRM(free)( dev->dev_private, sizeof(drm_mga_private_t),
661 dev->dev_private = NULL;
667 int mga_dma_init( DRM_IOCTL_ARGS )
672 DRM_COPY_FROM_USER_IOCTL( init, (drm_mga_init_t *)data, sizeof(init) );
674 switch ( init.func ) {
676 return mga_do_init_dma( dev, &init );
677 case MGA_CLEANUP_DMA:
678 return mga_do_cleanup_dma( dev );
681 return DRM_ERR(EINVAL);
685 /* ================================================================
686 * Primary DMA stream management
689 int mga_dma_flush( DRM_IOCTL_ARGS )
692 drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
695 LOCK_TEST_WITH_RETURN( dev, filp );
697 DRM_COPY_FROM_USER_IOCTL( lock, (drm_lock_t *)data, sizeof(lock) );
699 DRM_DEBUG( "%s%s%s\n",
700 (lock.flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
701 (lock.flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
702 (lock.flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "" );
704 WRAP_WAIT_WITH_RETURN( dev_priv );
706 if ( lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL) ) {
707 mga_do_dma_flush( dev_priv );
710 if ( lock.flags & _DRM_LOCK_QUIESCENT ) {
712 int ret = mga_do_wait_for_idle( dev_priv );
714 DRM_INFO( "%s: -EBUSY\n", __FUNCTION__ );
717 return mga_do_wait_for_idle( dev_priv );
724 int mga_dma_reset( DRM_IOCTL_ARGS )
727 drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
729 LOCK_TEST_WITH_RETURN( dev, filp );
731 return mga_do_dma_reset( dev_priv );
735 /* ================================================================
736 * DMA buffer management
739 static int mga_dma_get_buffers( DRMFILE filp,
740 drm_device_t *dev, drm_dma_t *d )
745 for ( i = d->granted_count ; i < d->request_count ; i++ ) {
746 buf = mga_freelist_get( dev );
747 if ( !buf ) return DRM_ERR(EAGAIN);
751 if ( DRM_COPY_TO_USER( &d->request_indices[i],
752 &buf->idx, sizeof(buf->idx) ) )
753 return DRM_ERR(EFAULT);
754 if ( DRM_COPY_TO_USER( &d->request_sizes[i],
755 &buf->total, sizeof(buf->total) ) )
756 return DRM_ERR(EFAULT);
763 int mga_dma_buffers( DRM_IOCTL_ARGS )
766 drm_device_dma_t *dma = dev->dma;
767 drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
771 LOCK_TEST_WITH_RETURN( dev, filp );
773 DRM_COPY_FROM_USER_IOCTL( d, (drm_dma_t *)data, sizeof(d) );
775 /* Please don't send us buffers.
777 if ( d.send_count != 0 ) {
778 DRM_ERROR( "Process %d trying to send %d buffers via drmDMA\n",
779 DRM_CURRENTPID, d.send_count );
780 return DRM_ERR(EINVAL);
783 /* We'll send you buffers.
785 if ( d.request_count < 0 || d.request_count > dma->buf_count ) {
786 DRM_ERROR( "Process %d trying to get %d buffers (of %d max)\n",
787 DRM_CURRENTPID, d.request_count, dma->buf_count );
788 return DRM_ERR(EINVAL);
791 WRAP_TEST_WITH_RETURN( dev_priv );
795 if ( d.request_count ) {
796 ret = mga_dma_get_buffers( filp, dev, &d );
799 DRM_COPY_TO_USER_IOCTL( (drm_dma_t *)data, d, sizeof(d) );