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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/char/drm/drm_bufs.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/char/drm/drm_bufs.c')
-rw-r--r--drivers/char/drm/drm_bufs.c1270
1 files changed, 1270 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_bufs.c b/drivers/char/drm/drm_bufs.c
new file mode 100644
index 000000000000..4113bcba67fe
--- /dev/null
+++ b/drivers/char/drm/drm_bufs.c
@@ -0,0 +1,1270 @@
1/**
2 * \file drm_bufs.h
3 * Generic buffer template
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
11 *
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36#include <linux/vmalloc.h>
37#include "drmP.h"
38
39/**
40 * Compute size order. Returns the exponent of the smaller power of two which
41 * is greater or equal to given number.
42 *
43 * \param size size.
44 * \return order.
45 *
46 * \todo Can be made faster.
47 */
48int drm_order( unsigned long size )
49{
50 int order;
51 unsigned long tmp;
52
53 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++)
54 ;
55
56 if (size & (size - 1))
57 ++order;
58
59 return order;
60}
61EXPORT_SYMBOL(drm_order);
62
63/**
64 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
65 *
66 * \param inode device inode.
67 * \param filp file pointer.
68 * \param cmd command.
69 * \param arg pointer to a drm_map structure.
70 * \return zero on success or a negative value on error.
71 *
72 * Adjusts the memory offset to its absolute value according to the mapping
73 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
74 * applicable and if supported by the kernel.
75 */
76int drm_addmap( struct inode *inode, struct file *filp,
77 unsigned int cmd, unsigned long arg )
78{
79 drm_file_t *priv = filp->private_data;
80 drm_device_t *dev = priv->head->dev;
81 drm_map_t *map;
82 drm_map_t __user *argp = (void __user *)arg;
83 drm_map_list_t *list;
84
85 if ( !(filp->f_mode & 3) ) return -EACCES; /* Require read/write */
86
87 map = drm_alloc( sizeof(*map), DRM_MEM_MAPS );
88 if ( !map )
89 return -ENOMEM;
90
91 if ( copy_from_user( map, argp, sizeof(*map) ) ) {
92 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
93 return -EFAULT;
94 }
95
96 /* Only allow shared memory to be removable since we only keep enough
97 * book keeping information about shared memory to allow for removal
98 * when processes fork.
99 */
100 if ( (map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM ) {
101 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
102 return -EINVAL;
103 }
104 DRM_DEBUG( "offset = 0x%08lx, size = 0x%08lx, type = %d\n",
105 map->offset, map->size, map->type );
106 if ( (map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK)) ) {
107 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
108 return -EINVAL;
109 }
110 map->mtrr = -1;
111 map->handle = NULL;
112
113 switch ( map->type ) {
114 case _DRM_REGISTERS:
115 case _DRM_FRAME_BUFFER:
116#if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__)
117 if ( map->offset + map->size < map->offset ||
118 map->offset < virt_to_phys(high_memory) ) {
119 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
120 return -EINVAL;
121 }
122#endif
123#ifdef __alpha__
124 map->offset += dev->hose->mem_space->start;
125#endif
126 if (drm_core_has_MTRR(dev)) {
127 if ( map->type == _DRM_FRAME_BUFFER ||
128 (map->flags & _DRM_WRITE_COMBINING) ) {
129 map->mtrr = mtrr_add( map->offset, map->size,
130 MTRR_TYPE_WRCOMB, 1 );
131 }
132 }
133 if (map->type == _DRM_REGISTERS)
134 map->handle = drm_ioremap( map->offset, map->size,
135 dev );
136 break;
137
138 case _DRM_SHM:
139 map->handle = vmalloc_32(map->size);
140 DRM_DEBUG( "%lu %d %p\n",
141 map->size, drm_order( map->size ), map->handle );
142 if ( !map->handle ) {
143 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
144 return -ENOMEM;
145 }
146 map->offset = (unsigned long)map->handle;
147 if ( map->flags & _DRM_CONTAINS_LOCK ) {
148 /* Prevent a 2nd X Server from creating a 2nd lock */
149 if (dev->lock.hw_lock != NULL) {
150 vfree( map->handle );
151 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
152 return -EBUSY;
153 }
154 dev->sigdata.lock =
155 dev->lock.hw_lock = map->handle; /* Pointer to lock */
156 }
157 break;
158 case _DRM_AGP:
159 if (drm_core_has_AGP(dev)) {
160#ifdef __alpha__
161 map->offset += dev->hose->mem_space->start;
162#endif
163 map->offset += dev->agp->base;
164 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
165 }
166 break;
167 case _DRM_SCATTER_GATHER:
168 if (!dev->sg) {
169 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
170 return -EINVAL;
171 }
172 map->offset += dev->sg->handle;
173 break;
174
175 default:
176 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
177 return -EINVAL;
178 }
179
180 list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
181 if(!list) {
182 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
183 return -EINVAL;
184 }
185 memset(list, 0, sizeof(*list));
186 list->map = map;
187
188 down(&dev->struct_sem);
189 list_add(&list->head, &dev->maplist->head);
190 up(&dev->struct_sem);
191
192 if ( copy_to_user( argp, map, sizeof(*map) ) )
193 return -EFAULT;
194 if ( map->type != _DRM_SHM ) {
195 if ( copy_to_user( &argp->handle,
196 &map->offset,
197 sizeof(map->offset) ) )
198 return -EFAULT;
199 }
200 return 0;
201}
202
203
204/**
205 * Remove a map private from list and deallocate resources if the mapping
206 * isn't in use.
207 *
208 * \param inode device inode.
209 * \param filp file pointer.
210 * \param cmd command.
211 * \param arg pointer to a drm_map_t structure.
212 * \return zero on success or a negative value on error.
213 *
214 * Searches the map on drm_device::maplist, removes it from the list, see if
215 * its being used, and free any associate resource (such as MTRR's) if it's not
216 * being on use.
217 *
218 * \sa addmap().
219 */
220int drm_rmmap(struct inode *inode, struct file *filp,
221 unsigned int cmd, unsigned long arg)
222{
223 drm_file_t *priv = filp->private_data;
224 drm_device_t *dev = priv->head->dev;
225 struct list_head *list;
226 drm_map_list_t *r_list = NULL;
227 drm_vma_entry_t *pt, *prev;
228 drm_map_t *map;
229 drm_map_t request;
230 int found_maps = 0;
231
232 if (copy_from_user(&request, (drm_map_t __user *)arg,
233 sizeof(request))) {
234 return -EFAULT;
235 }
236
237 down(&dev->struct_sem);
238 list = &dev->maplist->head;
239 list_for_each(list, &dev->maplist->head) {
240 r_list = list_entry(list, drm_map_list_t, head);
241
242 if(r_list->map &&
243 r_list->map->handle == request.handle &&
244 r_list->map->flags & _DRM_REMOVABLE) break;
245 }
246
247 /* List has wrapped around to the head pointer, or its empty we didn't
248 * find anything.
249 */
250 if(list == (&dev->maplist->head)) {
251 up(&dev->struct_sem);
252 return -EINVAL;
253 }
254 map = r_list->map;
255 list_del(list);
256 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
257
258 for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
259 if (pt->vma->vm_private_data == map) found_maps++;
260 }
261
262 if(!found_maps) {
263 switch (map->type) {
264 case _DRM_REGISTERS:
265 case _DRM_FRAME_BUFFER:
266 if (drm_core_has_MTRR(dev)) {
267 if (map->mtrr >= 0) {
268 int retcode;
269 retcode = mtrr_del(map->mtrr,
270 map->offset,
271 map->size);
272 DRM_DEBUG("mtrr_del = %d\n", retcode);
273 }
274 }
275 drm_ioremapfree(map->handle, map->size, dev);
276 break;
277 case _DRM_SHM:
278 vfree(map->handle);
279 break;
280 case _DRM_AGP:
281 case _DRM_SCATTER_GATHER:
282 break;
283 }
284 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
285 }
286 up(&dev->struct_sem);
287 return 0;
288}
289
290/**
291 * Cleanup after an error on one of the addbufs() functions.
292 *
293 * \param entry buffer entry where the error occurred.
294 *
295 * Frees any pages and buffers associated with the given entry.
296 */
297static void drm_cleanup_buf_error(drm_device_t *dev, drm_buf_entry_t *entry)
298{
299 int i;
300
301 if (entry->seg_count) {
302 for (i = 0; i < entry->seg_count; i++) {
303 if (entry->seglist[i]) {
304 drm_free_pages(entry->seglist[i],
305 entry->page_order,
306 DRM_MEM_DMA);
307 }
308 }
309 drm_free(entry->seglist,
310 entry->seg_count *
311 sizeof(*entry->seglist),
312 DRM_MEM_SEGS);
313
314 entry->seg_count = 0;
315 }
316
317 if (entry->buf_count) {
318 for (i = 0; i < entry->buf_count; i++) {
319 if (entry->buflist[i].dev_private) {
320 drm_free(entry->buflist[i].dev_private,
321 entry->buflist[i].dev_priv_size,
322 DRM_MEM_BUFS);
323 }
324 }
325 drm_free(entry->buflist,
326 entry->buf_count *
327 sizeof(*entry->buflist),
328 DRM_MEM_BUFS);
329
330 entry->buf_count = 0;
331 }
332}
333
334#if __OS_HAS_AGP
335/**
336 * Add AGP buffers for DMA transfers (ioctl).
337 *
338 * \param inode device inode.
339 * \param filp file pointer.
340 * \param cmd command.
341 * \param arg pointer to a drm_buf_desc_t request.
342 * \return zero on success or a negative number on failure.
343 *
344 * After some sanity checks creates a drm_buf structure for each buffer and
345 * reallocates the buffer list of the same size order to accommodate the new
346 * buffers.
347 */
348int drm_addbufs_agp( struct inode *inode, struct file *filp,
349 unsigned int cmd, unsigned long arg )
350{
351 drm_file_t *priv = filp->private_data;
352 drm_device_t *dev = priv->head->dev;
353 drm_device_dma_t *dma = dev->dma;
354 drm_buf_desc_t request;
355 drm_buf_entry_t *entry;
356 drm_buf_t *buf;
357 unsigned long offset;
358 unsigned long agp_offset;
359 int count;
360 int order;
361 int size;
362 int alignment;
363 int page_order;
364 int total;
365 int byte_count;
366 int i;
367 drm_buf_t **temp_buflist;
368 drm_buf_desc_t __user *argp = (void __user *)arg;
369
370 if ( !dma ) return -EINVAL;
371
372 if ( copy_from_user( &request, argp,
373 sizeof(request) ) )
374 return -EFAULT;
375
376 count = request.count;
377 order = drm_order( request.size );
378 size = 1 << order;
379
380 alignment = (request.flags & _DRM_PAGE_ALIGN)
381 ? PAGE_ALIGN(size) : size;
382 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
383 total = PAGE_SIZE << page_order;
384
385 byte_count = 0;
386 agp_offset = dev->agp->base + request.agp_start;
387
388 DRM_DEBUG( "count: %d\n", count );
389 DRM_DEBUG( "order: %d\n", order );
390 DRM_DEBUG( "size: %d\n", size );
391 DRM_DEBUG( "agp_offset: %lu\n", agp_offset );
392 DRM_DEBUG( "alignment: %d\n", alignment );
393 DRM_DEBUG( "page_order: %d\n", page_order );
394 DRM_DEBUG( "total: %d\n", total );
395
396 if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
397 if ( dev->queue_count ) return -EBUSY; /* Not while in use */
398
399 spin_lock( &dev->count_lock );
400 if ( dev->buf_use ) {
401 spin_unlock( &dev->count_lock );
402 return -EBUSY;
403 }
404 atomic_inc( &dev->buf_alloc );
405 spin_unlock( &dev->count_lock );
406
407 down( &dev->struct_sem );
408 entry = &dma->bufs[order];
409 if ( entry->buf_count ) {
410 up( &dev->struct_sem );
411 atomic_dec( &dev->buf_alloc );
412 return -ENOMEM; /* May only call once for each order */
413 }
414
415 if (count < 0 || count > 4096) {
416 up( &dev->struct_sem );
417 atomic_dec( &dev->buf_alloc );
418 return -EINVAL;
419 }
420
421 entry->buflist = drm_alloc( count * sizeof(*entry->buflist),
422 DRM_MEM_BUFS );
423 if ( !entry->buflist ) {
424 up( &dev->struct_sem );
425 atomic_dec( &dev->buf_alloc );
426 return -ENOMEM;
427 }
428 memset( entry->buflist, 0, count * sizeof(*entry->buflist) );
429
430 entry->buf_size = size;
431 entry->page_order = page_order;
432
433 offset = 0;
434
435 while ( entry->buf_count < count ) {
436 buf = &entry->buflist[entry->buf_count];
437 buf->idx = dma->buf_count + entry->buf_count;
438 buf->total = alignment;
439 buf->order = order;
440 buf->used = 0;
441
442 buf->offset = (dma->byte_count + offset);
443 buf->bus_address = agp_offset + offset;
444 buf->address = (void *)(agp_offset + offset);
445 buf->next = NULL;
446 buf->waiting = 0;
447 buf->pending = 0;
448 init_waitqueue_head( &buf->dma_wait );
449 buf->filp = NULL;
450
451 buf->dev_priv_size = dev->driver->dev_priv_size;
452 buf->dev_private = drm_alloc( buf->dev_priv_size,
453 DRM_MEM_BUFS );
454 if(!buf->dev_private) {
455 /* Set count correctly so we free the proper amount. */
456 entry->buf_count = count;
457 drm_cleanup_buf_error(dev,entry);
458 up( &dev->struct_sem );
459 atomic_dec( &dev->buf_alloc );
460 return -ENOMEM;
461 }
462 memset( buf->dev_private, 0, buf->dev_priv_size );
463
464 DRM_DEBUG( "buffer %d @ %p\n",
465 entry->buf_count, buf->address );
466
467 offset += alignment;
468 entry->buf_count++;
469 byte_count += PAGE_SIZE << page_order;
470 }
471
472 DRM_DEBUG( "byte_count: %d\n", byte_count );
473
474 temp_buflist = drm_realloc( dma->buflist,
475 dma->buf_count * sizeof(*dma->buflist),
476 (dma->buf_count + entry->buf_count)
477 * sizeof(*dma->buflist),
478 DRM_MEM_BUFS );
479 if(!temp_buflist) {
480 /* Free the entry because it isn't valid */
481 drm_cleanup_buf_error(dev,entry);
482 up( &dev->struct_sem );
483 atomic_dec( &dev->buf_alloc );
484 return -ENOMEM;
485 }
486 dma->buflist = temp_buflist;
487
488 for ( i = 0 ; i < entry->buf_count ; i++ ) {
489 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
490 }
491
492 dma->buf_count += entry->buf_count;
493 dma->byte_count += byte_count;
494
495 DRM_DEBUG( "dma->buf_count : %d\n", dma->buf_count );
496 DRM_DEBUG( "entry->buf_count : %d\n", entry->buf_count );
497
498 up( &dev->struct_sem );
499
500 request.count = entry->buf_count;
501 request.size = size;
502
503 if ( copy_to_user( argp, &request, sizeof(request) ) )
504 return -EFAULT;
505
506 dma->flags = _DRM_DMA_USE_AGP;
507
508 atomic_dec( &dev->buf_alloc );
509 return 0;
510}
511#endif /* __OS_HAS_AGP */
512
513int drm_addbufs_pci( struct inode *inode, struct file *filp,
514 unsigned int cmd, unsigned long arg )
515{
516 drm_file_t *priv = filp->private_data;
517 drm_device_t *dev = priv->head->dev;
518 drm_device_dma_t *dma = dev->dma;
519 drm_buf_desc_t request;
520 int count;
521 int order;
522 int size;
523 int total;
524 int page_order;
525 drm_buf_entry_t *entry;
526 unsigned long page;
527 drm_buf_t *buf;
528 int alignment;
529 unsigned long offset;
530 int i;
531 int byte_count;
532 int page_count;
533 unsigned long *temp_pagelist;
534 drm_buf_t **temp_buflist;
535 drm_buf_desc_t __user *argp = (void __user *)arg;
536
537 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA)) return -EINVAL;
538 if ( !dma ) return -EINVAL;
539
540 if ( copy_from_user( &request, argp, sizeof(request) ) )
541 return -EFAULT;
542
543 count = request.count;
544 order = drm_order( request.size );
545 size = 1 << order;
546
547 DRM_DEBUG( "count=%d, size=%d (%d), order=%d, queue_count=%d\n",
548 request.count, request.size, size,
549 order, dev->queue_count );
550
551 if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
552 if ( dev->queue_count ) return -EBUSY; /* Not while in use */
553
554 alignment = (request.flags & _DRM_PAGE_ALIGN)
555 ? PAGE_ALIGN(size) : size;
556 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
557 total = PAGE_SIZE << page_order;
558
559 spin_lock( &dev->count_lock );
560 if ( dev->buf_use ) {
561 spin_unlock( &dev->count_lock );
562 return -EBUSY;
563 }
564 atomic_inc( &dev->buf_alloc );
565 spin_unlock( &dev->count_lock );
566
567 down( &dev->struct_sem );
568 entry = &dma->bufs[order];
569 if ( entry->buf_count ) {
570 up( &dev->struct_sem );
571 atomic_dec( &dev->buf_alloc );
572 return -ENOMEM; /* May only call once for each order */
573 }
574
575 if (count < 0 || count > 4096) {
576 up( &dev->struct_sem );
577 atomic_dec( &dev->buf_alloc );
578 return -EINVAL;
579 }
580
581 entry->buflist = drm_alloc( count * sizeof(*entry->buflist),
582 DRM_MEM_BUFS );
583 if ( !entry->buflist ) {
584 up( &dev->struct_sem );
585 atomic_dec( &dev->buf_alloc );
586 return -ENOMEM;
587 }
588 memset( entry->buflist, 0, count * sizeof(*entry->buflist) );
589
590 entry->seglist = drm_alloc( count * sizeof(*entry->seglist),
591 DRM_MEM_SEGS );
592 if ( !entry->seglist ) {
593 drm_free( entry->buflist,
594 count * sizeof(*entry->buflist),
595 DRM_MEM_BUFS );
596 up( &dev->struct_sem );
597 atomic_dec( &dev->buf_alloc );
598 return -ENOMEM;
599 }
600 memset( entry->seglist, 0, count * sizeof(*entry->seglist) );
601
602 /* Keep the original pagelist until we know all the allocations
603 * have succeeded
604 */
605 temp_pagelist = drm_alloc( (dma->page_count + (count << page_order))
606 * sizeof(*dma->pagelist),
607 DRM_MEM_PAGES );
608 if (!temp_pagelist) {
609 drm_free( entry->buflist,
610 count * sizeof(*entry->buflist),
611 DRM_MEM_BUFS );
612 drm_free( entry->seglist,
613 count * sizeof(*entry->seglist),
614 DRM_MEM_SEGS );
615 up( &dev->struct_sem );
616 atomic_dec( &dev->buf_alloc );
617 return -ENOMEM;
618 }
619 memcpy(temp_pagelist,
620 dma->pagelist,
621 dma->page_count * sizeof(*dma->pagelist));
622 DRM_DEBUG( "pagelist: %d entries\n",
623 dma->page_count + (count << page_order) );
624
625 entry->buf_size = size;
626 entry->page_order = page_order;
627 byte_count = 0;
628 page_count = 0;
629
630 while ( entry->buf_count < count ) {
631 page = drm_alloc_pages( page_order, DRM_MEM_DMA );
632 if ( !page ) {
633 /* Set count correctly so we free the proper amount. */
634 entry->buf_count = count;
635 entry->seg_count = count;
636 drm_cleanup_buf_error(dev, entry);
637 drm_free( temp_pagelist,
638 (dma->page_count + (count << page_order))
639 * sizeof(*dma->pagelist),
640 DRM_MEM_PAGES );
641 up( &dev->struct_sem );
642 atomic_dec( &dev->buf_alloc );
643 return -ENOMEM;
644 }
645 entry->seglist[entry->seg_count++] = page;
646 for ( i = 0 ; i < (1 << page_order) ; i++ ) {
647 DRM_DEBUG( "page %d @ 0x%08lx\n",
648 dma->page_count + page_count,
649 page + PAGE_SIZE * i );
650 temp_pagelist[dma->page_count + page_count++]
651 = page + PAGE_SIZE * i;
652 }
653 for ( offset = 0 ;
654 offset + size <= total && entry->buf_count < count ;
655 offset += alignment, ++entry->buf_count ) {
656 buf = &entry->buflist[entry->buf_count];
657 buf->idx = dma->buf_count + entry->buf_count;
658 buf->total = alignment;
659 buf->order = order;
660 buf->used = 0;
661 buf->offset = (dma->byte_count + byte_count + offset);
662 buf->address = (void *)(page + offset);
663 buf->next = NULL;
664 buf->waiting = 0;
665 buf->pending = 0;
666 init_waitqueue_head( &buf->dma_wait );
667 buf->filp = NULL;
668
669 buf->dev_priv_size = dev->driver->dev_priv_size;
670 buf->dev_private = drm_alloc( buf->dev_priv_size,
671 DRM_MEM_BUFS );
672 if(!buf->dev_private) {
673 /* Set count correctly so we free the proper amount. */
674 entry->buf_count = count;
675 entry->seg_count = count;
676 drm_cleanup_buf_error(dev,entry);
677 drm_free( temp_pagelist,
678 (dma->page_count + (count << page_order))
679 * sizeof(*dma->pagelist),
680 DRM_MEM_PAGES );
681 up( &dev->struct_sem );
682 atomic_dec( &dev->buf_alloc );
683 return -ENOMEM;
684 }
685 memset( buf->dev_private, 0, buf->dev_priv_size );
686
687 DRM_DEBUG( "buffer %d @ %p\n",
688 entry->buf_count, buf->address );
689 }
690 byte_count += PAGE_SIZE << page_order;
691 }
692
693 temp_buflist = drm_realloc( dma->buflist,
694 dma->buf_count * sizeof(*dma->buflist),
695 (dma->buf_count + entry->buf_count)
696 * sizeof(*dma->buflist),
697 DRM_MEM_BUFS );
698 if (!temp_buflist) {
699 /* Free the entry because it isn't valid */
700 drm_cleanup_buf_error(dev,entry);
701 drm_free( temp_pagelist,
702 (dma->page_count + (count << page_order))
703 * sizeof(*dma->pagelist),
704 DRM_MEM_PAGES );
705 up( &dev->struct_sem );
706 atomic_dec( &dev->buf_alloc );
707 return -ENOMEM;
708 }
709 dma->buflist = temp_buflist;
710
711 for ( i = 0 ; i < entry->buf_count ; i++ ) {
712 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
713 }
714
715 /* No allocations failed, so now we can replace the orginal pagelist
716 * with the new one.
717 */
718 if (dma->page_count) {
719 drm_free(dma->pagelist,
720 dma->page_count * sizeof(*dma->pagelist),
721 DRM_MEM_PAGES);
722 }
723 dma->pagelist = temp_pagelist;
724
725 dma->buf_count += entry->buf_count;
726 dma->seg_count += entry->seg_count;
727 dma->page_count += entry->seg_count << page_order;
728 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
729
730 up( &dev->struct_sem );
731
732 request.count = entry->buf_count;
733 request.size = size;
734
735 if ( copy_to_user( argp, &request, sizeof(request) ) )
736 return -EFAULT;
737
738 atomic_dec( &dev->buf_alloc );
739 return 0;
740
741}
742
743int drm_addbufs_sg( struct inode *inode, struct file *filp,
744 unsigned int cmd, unsigned long arg )
745{
746 drm_file_t *priv = filp->private_data;
747 drm_device_t *dev = priv->head->dev;
748 drm_device_dma_t *dma = dev->dma;
749 drm_buf_desc_t __user *argp = (void __user *)arg;
750 drm_buf_desc_t request;
751 drm_buf_entry_t *entry;
752 drm_buf_t *buf;
753 unsigned long offset;
754 unsigned long agp_offset;
755 int count;
756 int order;
757 int size;
758 int alignment;
759 int page_order;
760 int total;
761 int byte_count;
762 int i;
763 drm_buf_t **temp_buflist;
764
765 if (!drm_core_check_feature(dev, DRIVER_SG)) return -EINVAL;
766
767 if ( !dma ) return -EINVAL;
768
769 if ( copy_from_user( &request, argp, sizeof(request) ) )
770 return -EFAULT;
771
772 count = request.count;
773 order = drm_order( request.size );
774 size = 1 << order;
775
776 alignment = (request.flags & _DRM_PAGE_ALIGN)
777 ? PAGE_ALIGN(size) : size;
778 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
779 total = PAGE_SIZE << page_order;
780
781 byte_count = 0;
782 agp_offset = request.agp_start;
783
784 DRM_DEBUG( "count: %d\n", count );
785 DRM_DEBUG( "order: %d\n", order );
786 DRM_DEBUG( "size: %d\n", size );
787 DRM_DEBUG( "agp_offset: %lu\n", agp_offset );
788 DRM_DEBUG( "alignment: %d\n", alignment );
789 DRM_DEBUG( "page_order: %d\n", page_order );
790 DRM_DEBUG( "total: %d\n", total );
791
792 if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
793 if ( dev->queue_count ) return -EBUSY; /* Not while in use */
794
795 spin_lock( &dev->count_lock );
796 if ( dev->buf_use ) {
797 spin_unlock( &dev->count_lock );
798 return -EBUSY;
799 }
800 atomic_inc( &dev->buf_alloc );
801 spin_unlock( &dev->count_lock );
802
803 down( &dev->struct_sem );
804 entry = &dma->bufs[order];
805 if ( entry->buf_count ) {
806 up( &dev->struct_sem );
807 atomic_dec( &dev->buf_alloc );
808 return -ENOMEM; /* May only call once for each order */
809 }
810
811 if (count < 0 || count > 4096) {
812 up( &dev->struct_sem );
813 atomic_dec( &dev->buf_alloc );
814 return -EINVAL;
815 }
816
817 entry->buflist = drm_alloc( count * sizeof(*entry->buflist),
818 DRM_MEM_BUFS );
819 if ( !entry->buflist ) {
820 up( &dev->struct_sem );
821 atomic_dec( &dev->buf_alloc );
822 return -ENOMEM;
823 }
824 memset( entry->buflist, 0, count * sizeof(*entry->buflist) );
825
826 entry->buf_size = size;
827 entry->page_order = page_order;
828
829 offset = 0;
830
831 while ( entry->buf_count < count ) {
832 buf = &entry->buflist[entry->buf_count];
833 buf->idx = dma->buf_count + entry->buf_count;
834 buf->total = alignment;
835 buf->order = order;
836 buf->used = 0;
837
838 buf->offset = (dma->byte_count + offset);
839 buf->bus_address = agp_offset + offset;
840 buf->address = (void *)(agp_offset + offset + dev->sg->handle);
841 buf->next = NULL;
842 buf->waiting = 0;
843 buf->pending = 0;
844 init_waitqueue_head( &buf->dma_wait );
845 buf->filp = NULL;
846
847 buf->dev_priv_size = dev->driver->dev_priv_size;
848 buf->dev_private = drm_alloc( buf->dev_priv_size,
849 DRM_MEM_BUFS );
850 if(!buf->dev_private) {
851 /* Set count correctly so we free the proper amount. */
852 entry->buf_count = count;
853 drm_cleanup_buf_error(dev,entry);
854 up( &dev->struct_sem );
855 atomic_dec( &dev->buf_alloc );
856 return -ENOMEM;
857 }
858
859 memset( buf->dev_private, 0, buf->dev_priv_size );
860
861 DRM_DEBUG( "buffer %d @ %p\n",
862 entry->buf_count, buf->address );
863
864 offset += alignment;
865 entry->buf_count++;
866 byte_count += PAGE_SIZE << page_order;
867 }
868
869 DRM_DEBUG( "byte_count: %d\n", byte_count );
870
871 temp_buflist = drm_realloc( dma->buflist,
872 dma->buf_count * sizeof(*dma->buflist),
873 (dma->buf_count + entry->buf_count)
874 * sizeof(*dma->buflist),
875 DRM_MEM_BUFS );
876 if(!temp_buflist) {
877 /* Free the entry because it isn't valid */
878 drm_cleanup_buf_error(dev,entry);
879 up( &dev->struct_sem );
880 atomic_dec( &dev->buf_alloc );
881 return -ENOMEM;
882 }
883 dma->buflist = temp_buflist;
884
885 for ( i = 0 ; i < entry->buf_count ; i++ ) {
886 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
887 }
888
889 dma->buf_count += entry->buf_count;
890 dma->byte_count += byte_count;
891
892 DRM_DEBUG( "dma->buf_count : %d\n", dma->buf_count );
893 DRM_DEBUG( "entry->buf_count : %d\n", entry->buf_count );
894
895 up( &dev->struct_sem );
896
897 request.count = entry->buf_count;
898 request.size = size;
899
900 if ( copy_to_user( argp, &request, sizeof(request) ) )
901 return -EFAULT;
902
903 dma->flags = _DRM_DMA_USE_SG;
904
905 atomic_dec( &dev->buf_alloc );
906 return 0;
907}
908
909/**
910 * Add buffers for DMA transfers (ioctl).
911 *
912 * \param inode device inode.
913 * \param filp file pointer.
914 * \param cmd command.
915 * \param arg pointer to a drm_buf_desc_t request.
916 * \return zero on success or a negative number on failure.
917 *
918 * According with the memory type specified in drm_buf_desc::flags and the
919 * build options, it dispatches the call either to addbufs_agp(),
920 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
921 * PCI memory respectively.
922 */
923int drm_addbufs( struct inode *inode, struct file *filp,
924 unsigned int cmd, unsigned long arg )
925{
926 drm_buf_desc_t request;
927 drm_file_t *priv = filp->private_data;
928 drm_device_t *dev = priv->head->dev;
929
930 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
931 return -EINVAL;
932
933 if ( copy_from_user( &request, (drm_buf_desc_t __user *)arg,
934 sizeof(request) ) )
935 return -EFAULT;
936
937#if __OS_HAS_AGP
938 if ( request.flags & _DRM_AGP_BUFFER )
939 return drm_addbufs_agp( inode, filp, cmd, arg );
940 else
941#endif
942 if ( request.flags & _DRM_SG_BUFFER )
943 return drm_addbufs_sg( inode, filp, cmd, arg );
944 else
945 return drm_addbufs_pci( inode, filp, cmd, arg );
946}
947
948
949/**
950 * Get information about the buffer mappings.
951 *
952 * This was originally mean for debugging purposes, or by a sophisticated
953 * client library to determine how best to use the available buffers (e.g.,
954 * large buffers can be used for image transfer).
955 *
956 * \param inode device inode.
957 * \param filp file pointer.
958 * \param cmd command.
959 * \param arg pointer to a drm_buf_info structure.
960 * \return zero on success or a negative number on failure.
961 *
962 * Increments drm_device::buf_use while holding the drm_device::count_lock
963 * lock, preventing of allocating more buffers after this call. Information
964 * about each requested buffer is then copied into user space.
965 */
966int drm_infobufs( struct inode *inode, struct file *filp,
967 unsigned int cmd, unsigned long arg )
968{
969 drm_file_t *priv = filp->private_data;
970 drm_device_t *dev = priv->head->dev;
971 drm_device_dma_t *dma = dev->dma;
972 drm_buf_info_t request;
973 drm_buf_info_t __user *argp = (void __user *)arg;
974 int i;
975 int count;
976
977 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
978 return -EINVAL;
979
980 if ( !dma ) return -EINVAL;
981
982 spin_lock( &dev->count_lock );
983 if ( atomic_read( &dev->buf_alloc ) ) {
984 spin_unlock( &dev->count_lock );
985 return -EBUSY;
986 }
987 ++dev->buf_use; /* Can't allocate more after this call */
988 spin_unlock( &dev->count_lock );
989
990 if ( copy_from_user( &request, argp, sizeof(request) ) )
991 return -EFAULT;
992
993 for ( i = 0, count = 0 ; i < DRM_MAX_ORDER + 1 ; i++ ) {
994 if ( dma->bufs[i].buf_count ) ++count;
995 }
996
997 DRM_DEBUG( "count = %d\n", count );
998
999 if ( request.count >= count ) {
1000 for ( i = 0, count = 0 ; i < DRM_MAX_ORDER + 1 ; i++ ) {
1001 if ( dma->bufs[i].buf_count ) {
1002 drm_buf_desc_t __user *to = &request.list[count];
1003 drm_buf_entry_t *from = &dma->bufs[i];
1004 drm_freelist_t *list = &dma->bufs[i].freelist;
1005 if ( copy_to_user( &to->count,
1006 &from->buf_count,
1007 sizeof(from->buf_count) ) ||
1008 copy_to_user( &to->size,
1009 &from->buf_size,
1010 sizeof(from->buf_size) ) ||
1011 copy_to_user( &to->low_mark,
1012 &list->low_mark,
1013 sizeof(list->low_mark) ) ||
1014 copy_to_user( &to->high_mark,
1015 &list->high_mark,
1016 sizeof(list->high_mark) ) )
1017 return -EFAULT;
1018
1019 DRM_DEBUG( "%d %d %d %d %d\n",
1020 i,
1021 dma->bufs[i].buf_count,
1022 dma->bufs[i].buf_size,
1023 dma->bufs[i].freelist.low_mark,
1024 dma->bufs[i].freelist.high_mark );
1025 ++count;
1026 }
1027 }
1028 }
1029 request.count = count;
1030
1031 if ( copy_to_user( argp, &request, sizeof(request) ) )
1032 return -EFAULT;
1033
1034 return 0;
1035}
1036
1037/**
1038 * Specifies a low and high water mark for buffer allocation
1039 *
1040 * \param inode device inode.
1041 * \param filp file pointer.
1042 * \param cmd command.
1043 * \param arg a pointer to a drm_buf_desc structure.
1044 * \return zero on success or a negative number on failure.
1045 *
1046 * Verifies that the size order is bounded between the admissible orders and
1047 * updates the respective drm_device_dma::bufs entry low and high water mark.
1048 *
1049 * \note This ioctl is deprecated and mostly never used.
1050 */
1051int drm_markbufs( struct inode *inode, struct file *filp,
1052 unsigned int cmd, unsigned long arg )
1053{
1054 drm_file_t *priv = filp->private_data;
1055 drm_device_t *dev = priv->head->dev;
1056 drm_device_dma_t *dma = dev->dma;
1057 drm_buf_desc_t request;
1058 int order;
1059 drm_buf_entry_t *entry;
1060
1061 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1062 return -EINVAL;
1063
1064 if ( !dma ) return -EINVAL;
1065
1066 if ( copy_from_user( &request,
1067 (drm_buf_desc_t __user *)arg,
1068 sizeof(request) ) )
1069 return -EFAULT;
1070
1071 DRM_DEBUG( "%d, %d, %d\n",
1072 request.size, request.low_mark, request.high_mark );
1073 order = drm_order( request.size );
1074 if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
1075 entry = &dma->bufs[order];
1076
1077 if ( request.low_mark < 0 || request.low_mark > entry->buf_count )
1078 return -EINVAL;
1079 if ( request.high_mark < 0 || request.high_mark > entry->buf_count )
1080 return -EINVAL;
1081
1082 entry->freelist.low_mark = request.low_mark;
1083 entry->freelist.high_mark = request.high_mark;
1084
1085 return 0;
1086}
1087
1088/**
1089 * Unreserve the buffers in list, previously reserved using drmDMA.
1090 *
1091 * \param inode device inode.
1092 * \param filp file pointer.
1093 * \param cmd command.
1094 * \param arg pointer to a drm_buf_free structure.
1095 * \return zero on success or a negative number on failure.
1096 *
1097 * Calls free_buffer() for each used buffer.
1098 * This function is primarily used for debugging.
1099 */
1100int drm_freebufs( struct inode *inode, struct file *filp,
1101 unsigned int cmd, unsigned long arg )
1102{
1103 drm_file_t *priv = filp->private_data;
1104 drm_device_t *dev = priv->head->dev;
1105 drm_device_dma_t *dma = dev->dma;
1106 drm_buf_free_t request;
1107 int i;
1108 int idx;
1109 drm_buf_t *buf;
1110
1111 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1112 return -EINVAL;
1113
1114 if ( !dma ) return -EINVAL;
1115
1116 if ( copy_from_user( &request,
1117 (drm_buf_free_t __user *)arg,
1118 sizeof(request) ) )
1119 return -EFAULT;
1120
1121 DRM_DEBUG( "%d\n", request.count );
1122 for ( i = 0 ; i < request.count ; i++ ) {
1123 if ( copy_from_user( &idx,
1124 &request.list[i],
1125 sizeof(idx) ) )
1126 return -EFAULT;
1127 if ( idx < 0 || idx >= dma->buf_count ) {
1128 DRM_ERROR( "Index %d (of %d max)\n",
1129 idx, dma->buf_count - 1 );
1130 return -EINVAL;
1131 }
1132 buf = dma->buflist[idx];
1133 if ( buf->filp != filp ) {
1134 DRM_ERROR( "Process %d freeing buffer not owned\n",
1135 current->pid );
1136 return -EINVAL;
1137 }
1138 drm_free_buffer( dev, buf );
1139 }
1140
1141 return 0;
1142}
1143
1144/**
1145 * Maps all of the DMA buffers into client-virtual space (ioctl).
1146 *
1147 * \param inode device inode.
1148 * \param filp file pointer.
1149 * \param cmd command.
1150 * \param arg pointer to a drm_buf_map structure.
1151 * \return zero on success or a negative number on failure.
1152 *
1153 * Maps the AGP or SG buffer region with do_mmap(), and copies information
1154 * about each buffer into user space. The PCI buffers are already mapped on the
1155 * addbufs_pci() call.
1156 */
1157int drm_mapbufs( struct inode *inode, struct file *filp,
1158 unsigned int cmd, unsigned long arg )
1159{
1160 drm_file_t *priv = filp->private_data;
1161 drm_device_t *dev = priv->head->dev;
1162 drm_device_dma_t *dma = dev->dma;
1163 drm_buf_map_t __user *argp = (void __user *)arg;
1164 int retcode = 0;
1165 const int zero = 0;
1166 unsigned long virtual;
1167 unsigned long address;
1168 drm_buf_map_t request;
1169 int i;
1170
1171 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1172 return -EINVAL;
1173
1174 if ( !dma ) return -EINVAL;
1175
1176 spin_lock( &dev->count_lock );
1177 if ( atomic_read( &dev->buf_alloc ) ) {
1178 spin_unlock( &dev->count_lock );
1179 return -EBUSY;
1180 }
1181 dev->buf_use++; /* Can't allocate more after this call */
1182 spin_unlock( &dev->count_lock );
1183
1184 if ( copy_from_user( &request, argp, sizeof(request) ) )
1185 return -EFAULT;
1186
1187 if ( request.count >= dma->buf_count ) {
1188 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP)) ||
1189 (drm_core_check_feature(dev, DRIVER_SG) && (dma->flags & _DRM_DMA_USE_SG)) ) {
1190 drm_map_t *map = dev->agp_buffer_map;
1191
1192 if ( !map ) {
1193 retcode = -EINVAL;
1194 goto done;
1195 }
1196
1197#if LINUX_VERSION_CODE <= 0x020402
1198 down( &current->mm->mmap_sem );
1199#else
1200 down_write( &current->mm->mmap_sem );
1201#endif
1202 virtual = do_mmap( filp, 0, map->size,
1203 PROT_READ | PROT_WRITE,
1204 MAP_SHARED,
1205 (unsigned long)map->offset );
1206#if LINUX_VERSION_CODE <= 0x020402
1207 up( &current->mm->mmap_sem );
1208#else
1209 up_write( &current->mm->mmap_sem );
1210#endif
1211 } else {
1212#if LINUX_VERSION_CODE <= 0x020402
1213 down( &current->mm->mmap_sem );
1214#else
1215 down_write( &current->mm->mmap_sem );
1216#endif
1217 virtual = do_mmap( filp, 0, dma->byte_count,
1218 PROT_READ | PROT_WRITE,
1219 MAP_SHARED, 0 );
1220#if LINUX_VERSION_CODE <= 0x020402
1221 up( &current->mm->mmap_sem );
1222#else
1223 up_write( &current->mm->mmap_sem );
1224#endif
1225 }
1226 if ( virtual > -1024UL ) {
1227 /* Real error */
1228 retcode = (signed long)virtual;
1229 goto done;
1230 }
1231 request.virtual = (void __user *)virtual;
1232
1233 for ( i = 0 ; i < dma->buf_count ; i++ ) {
1234 if ( copy_to_user( &request.list[i].idx,
1235 &dma->buflist[i]->idx,
1236 sizeof(request.list[0].idx) ) ) {
1237 retcode = -EFAULT;
1238 goto done;
1239 }
1240 if ( copy_to_user( &request.list[i].total,
1241 &dma->buflist[i]->total,
1242 sizeof(request.list[0].total) ) ) {
1243 retcode = -EFAULT;
1244 goto done;
1245 }
1246 if ( copy_to_user( &request.list[i].used,
1247 &zero,
1248 sizeof(zero) ) ) {
1249 retcode = -EFAULT;
1250 goto done;
1251 }
1252 address = virtual + dma->buflist[i]->offset; /* *** */
1253 if ( copy_to_user( &request.list[i].address,
1254 &address,
1255 sizeof(address) ) ) {
1256 retcode = -EFAULT;
1257 goto done;
1258 }
1259 }
1260 }
1261 done:
1262 request.count = dma->buf_count;
1263 DRM_DEBUG( "%d buffers, retcode = %d\n", request.count, retcode );
1264
1265 if ( copy_to_user( argp, &request, sizeof(request) ) )
1266 return -EFAULT;
1267
1268 return retcode;
1269}
1270
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-24 19:52:14 -0500