]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/char/drm/drm_bufs.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-fixes-2.6
[mirror_ubuntu-bionic-kernel.git] / drivers / char / drm / drm_bufs.c
1 /**
2 * \file drm_bufs.c
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 unsigned long drm_get_resource_start(drm_device_t *dev, unsigned int resource)
40 {
41 return pci_resource_start(dev->pdev, resource);
42 }
43 EXPORT_SYMBOL(drm_get_resource_start);
44
45 unsigned long drm_get_resource_len(drm_device_t *dev, unsigned int resource)
46 {
47 return pci_resource_len(dev->pdev, resource);
48 }
49
50 EXPORT_SYMBOL(drm_get_resource_len);
51
52 static drm_map_list_t *drm_find_matching_map(drm_device_t *dev,
53 drm_local_map_t *map)
54 {
55 struct list_head *list;
56
57 list_for_each(list, &dev->maplist->head) {
58 drm_map_list_t *entry = list_entry(list, drm_map_list_t, head);
59 if (entry->map && map->type == entry->map->type &&
60 entry->map->offset == map->offset) {
61 return entry;
62 }
63 }
64
65 return NULL;
66 }
67
68 /*
69 * Used to allocate 32-bit handles for mappings.
70 */
71 #define START_RANGE 0x10000000
72 #define END_RANGE 0x40000000
73
74 #ifdef _LP64
75 static __inline__ unsigned int HandleID(unsigned long lhandle,
76 drm_device_t *dev)
77 {
78 static unsigned int map32_handle = START_RANGE;
79 unsigned int hash;
80
81 if (lhandle & 0xffffffff00000000) {
82 hash = map32_handle;
83 map32_handle += PAGE_SIZE;
84 if (map32_handle > END_RANGE)
85 map32_handle = START_RANGE;
86 } else
87 hash = lhandle;
88
89 while (1) {
90 drm_map_list_t *_entry;
91 list_for_each_entry(_entry, &dev->maplist->head, head) {
92 if (_entry->user_token == hash)
93 break;
94 }
95 if (&_entry->head == &dev->maplist->head)
96 return hash;
97
98 hash += PAGE_SIZE;
99 map32_handle += PAGE_SIZE;
100 }
101 }
102 #else
103 # define HandleID(x,dev) (unsigned int)(x)
104 #endif
105
106 /**
107 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
108 *
109 * \param inode device inode.
110 * \param filp file pointer.
111 * \param cmd command.
112 * \param arg pointer to a drm_map structure.
113 * \return zero on success or a negative value on error.
114 *
115 * Adjusts the memory offset to its absolute value according to the mapping
116 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
117 * applicable and if supported by the kernel.
118 */
119 static int drm_addmap_core(drm_device_t * dev, unsigned int offset,
120 unsigned int size, drm_map_type_t type,
121 drm_map_flags_t flags, drm_map_list_t ** maplist)
122 {
123 drm_map_t *map;
124 drm_map_list_t *list;
125 drm_dma_handle_t *dmah;
126
127 map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
128 if (!map)
129 return -ENOMEM;
130
131 map->offset = offset;
132 map->size = size;
133 map->flags = flags;
134 map->type = type;
135
136 /* Only allow shared memory to be removable since we only keep enough
137 * book keeping information about shared memory to allow for removal
138 * when processes fork.
139 */
140 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
141 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
142 return -EINVAL;
143 }
144 DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
145 map->offset, map->size, map->type);
146 if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
147 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
148 return -EINVAL;
149 }
150 map->mtrr = -1;
151 map->handle = NULL;
152
153 switch (map->type) {
154 case _DRM_REGISTERS:
155 case _DRM_FRAME_BUFFER:
156 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
157 if (map->offset + (map->size-1) < map->offset ||
158 map->offset < virt_to_phys(high_memory)) {
159 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
160 return -EINVAL;
161 }
162 #endif
163 #ifdef __alpha__
164 map->offset += dev->hose->mem_space->start;
165 #endif
166 /* Some drivers preinitialize some maps, without the X Server
167 * needing to be aware of it. Therefore, we just return success
168 * when the server tries to create a duplicate map.
169 */
170 list = drm_find_matching_map(dev, map);
171 if (list != NULL) {
172 if (list->map->size != map->size) {
173 DRM_DEBUG("Matching maps of type %d with "
174 "mismatched sizes, (%ld vs %ld)\n",
175 map->type, map->size,
176 list->map->size);
177 list->map->size = map->size;
178 }
179
180 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
181 *maplist = list;
182 return 0;
183 }
184
185 if (drm_core_has_MTRR(dev)) {
186 if (map->type == _DRM_FRAME_BUFFER ||
187 (map->flags & _DRM_WRITE_COMBINING)) {
188 map->mtrr = mtrr_add(map->offset, map->size,
189 MTRR_TYPE_WRCOMB, 1);
190 }
191 }
192 if (map->type == _DRM_REGISTERS)
193 map->handle = drm_ioremap(map->offset, map->size, dev);
194 break;
195
196 case _DRM_SHM:
197 map->handle = vmalloc_32(map->size);
198 DRM_DEBUG("%lu %d %p\n",
199 map->size, drm_order(map->size), map->handle);
200 if (!map->handle) {
201 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
202 return -ENOMEM;
203 }
204 map->offset = (unsigned long)map->handle;
205 if (map->flags & _DRM_CONTAINS_LOCK) {
206 /* Prevent a 2nd X Server from creating a 2nd lock */
207 if (dev->lock.hw_lock != NULL) {
208 vfree(map->handle);
209 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
210 return -EBUSY;
211 }
212 dev->sigdata.lock = dev->lock.hw_lock = map->handle; /* Pointer to lock */
213 }
214 break;
215 case _DRM_AGP:
216 if (drm_core_has_AGP(dev)) {
217 #ifdef __alpha__
218 map->offset += dev->hose->mem_space->start;
219 #endif
220 map->offset += dev->agp->base;
221 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
222 }
223 break;
224 case _DRM_SCATTER_GATHER:
225 if (!dev->sg) {
226 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
227 return -EINVAL;
228 }
229 map->offset += (unsigned long)dev->sg->virtual;
230 break;
231 case _DRM_CONSISTENT:
232 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
233 * As we're limiting the address to 2^32-1 (or less),
234 * casting it down to 32 bits is no problem, but we
235 * need to point to a 64bit variable first. */
236 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
237 if (!dmah) {
238 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
239 return -ENOMEM;
240 }
241 map->handle = dmah->vaddr;
242 map->offset = (unsigned long)dmah->busaddr;
243 kfree(dmah);
244 break;
245 default:
246 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
247 return -EINVAL;
248 }
249
250 list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
251 if (!list) {
252 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
253 return -EINVAL;
254 }
255 memset(list, 0, sizeof(*list));
256 list->map = map;
257
258 mutex_lock(&dev->struct_mutex);
259 list_add(&list->head, &dev->maplist->head);
260 /* Assign a 32-bit handle */
261 /* We do it here so that dev->struct_mutex protects the increment */
262 list->user_token = HandleID(map->type == _DRM_SHM
263 ? (unsigned long)map->handle
264 : map->offset, dev);
265 mutex_unlock(&dev->struct_mutex);
266
267 *maplist = list;
268 return 0;
269 }
270
271 int drm_addmap(drm_device_t * dev, unsigned int offset,
272 unsigned int size, drm_map_type_t type,
273 drm_map_flags_t flags, drm_local_map_t ** map_ptr)
274 {
275 drm_map_list_t *list;
276 int rc;
277
278 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
279 if (!rc)
280 *map_ptr = list->map;
281 return rc;
282 }
283
284 EXPORT_SYMBOL(drm_addmap);
285
286 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
287 unsigned int cmd, unsigned long arg)
288 {
289 drm_file_t *priv = filp->private_data;
290 drm_device_t *dev = priv->head->dev;
291 drm_map_t map;
292 drm_map_list_t *maplist;
293 drm_map_t __user *argp = (void __user *)arg;
294 int err;
295
296 if (!(filp->f_mode & 3))
297 return -EACCES; /* Require read/write */
298
299 if (copy_from_user(&map, argp, sizeof(map))) {
300 return -EFAULT;
301 }
302
303 if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
304 return -EPERM;
305
306 err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
307 &maplist);
308
309 if (err)
310 return err;
311
312 if (copy_to_user(argp, maplist->map, sizeof(drm_map_t)))
313 return -EFAULT;
314
315 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
316 if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
317 return -EFAULT;
318 return 0;
319 }
320
321 /**
322 * Remove a map private from list and deallocate resources if the mapping
323 * isn't in use.
324 *
325 * \param inode device inode.
326 * \param filp file pointer.
327 * \param cmd command.
328 * \param arg pointer to a drm_map_t structure.
329 * \return zero on success or a negative value on error.
330 *
331 * Searches the map on drm_device::maplist, removes it from the list, see if
332 * its being used, and free any associate resource (such as MTRR's) if it's not
333 * being on use.
334 *
335 * \sa drm_addmap
336 */
337 int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
338 {
339 struct list_head *list;
340 drm_map_list_t *r_list = NULL;
341 drm_dma_handle_t dmah;
342
343 /* Find the list entry for the map and remove it */
344 list_for_each(list, &dev->maplist->head) {
345 r_list = list_entry(list, drm_map_list_t, head);
346
347 if (r_list->map == map) {
348 list_del(list);
349 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
350 break;
351 }
352 }
353
354 /* List has wrapped around to the head pointer, or it's empty and we
355 * didn't find anything.
356 */
357 if (list == (&dev->maplist->head)) {
358 return -EINVAL;
359 }
360
361 switch (map->type) {
362 case _DRM_REGISTERS:
363 drm_ioremapfree(map->handle, map->size, dev);
364 /* FALLTHROUGH */
365 case _DRM_FRAME_BUFFER:
366 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
367 int retcode;
368 retcode = mtrr_del(map->mtrr, map->offset, map->size);
369 DRM_DEBUG("mtrr_del=%d\n", retcode);
370 }
371 break;
372 case _DRM_SHM:
373 vfree(map->handle);
374 break;
375 case _DRM_AGP:
376 case _DRM_SCATTER_GATHER:
377 break;
378 case _DRM_CONSISTENT:
379 dmah.vaddr = map->handle;
380 dmah.busaddr = map->offset;
381 dmah.size = map->size;
382 __drm_pci_free(dev, &dmah);
383 break;
384 }
385 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
386
387 return 0;
388 }
389
390 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
391 {
392 int ret;
393
394 mutex_lock(&dev->struct_mutex);
395 ret = drm_rmmap_locked(dev, map);
396 mutex_unlock(&dev->struct_mutex);
397
398 return ret;
399 }
400
401 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
402 * the last close of the device, and this is necessary for cleanup when things
403 * exit uncleanly. Therefore, having userland manually remove mappings seems
404 * like a pointless exercise since they're going away anyway.
405 *
406 * One use case might be after addmap is allowed for normal users for SHM and
407 * gets used by drivers that the server doesn't need to care about. This seems
408 * unlikely.
409 */
410 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
411 unsigned int cmd, unsigned long arg)
412 {
413 drm_file_t *priv = filp->private_data;
414 drm_device_t *dev = priv->head->dev;
415 drm_map_t request;
416 drm_local_map_t *map = NULL;
417 struct list_head *list;
418 int ret;
419
420 if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
421 return -EFAULT;
422 }
423
424 mutex_lock(&dev->struct_mutex);
425 list_for_each(list, &dev->maplist->head) {
426 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
427
428 if (r_list->map &&
429 r_list->user_token == (unsigned long)request.handle &&
430 r_list->map->flags & _DRM_REMOVABLE) {
431 map = r_list->map;
432 break;
433 }
434 }
435
436 /* List has wrapped around to the head pointer, or its empty we didn't
437 * find anything.
438 */
439 if (list == (&dev->maplist->head)) {
440 mutex_unlock(&dev->struct_mutex);
441 return -EINVAL;
442 }
443
444 if (!map)
445 return -EINVAL;
446
447 /* Register and framebuffer maps are permanent */
448 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
449 mutex_unlock(&dev->struct_mutex);
450 return 0;
451 }
452
453 ret = drm_rmmap_locked(dev, map);
454
455 mutex_unlock(&dev->struct_mutex);
456
457 return ret;
458 }
459
460 /**
461 * Cleanup after an error on one of the addbufs() functions.
462 *
463 * \param dev DRM device.
464 * \param entry buffer entry where the error occurred.
465 *
466 * Frees any pages and buffers associated with the given entry.
467 */
468 static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
469 {
470 int i;
471
472 if (entry->seg_count) {
473 for (i = 0; i < entry->seg_count; i++) {
474 if (entry->seglist[i]) {
475 drm_pci_free(dev, entry->seglist[i]);
476 }
477 }
478 drm_free(entry->seglist,
479 entry->seg_count *
480 sizeof(*entry->seglist), DRM_MEM_SEGS);
481
482 entry->seg_count = 0;
483 }
484
485 if (entry->buf_count) {
486 for (i = 0; i < entry->buf_count; i++) {
487 if (entry->buflist[i].dev_private) {
488 drm_free(entry->buflist[i].dev_private,
489 entry->buflist[i].dev_priv_size,
490 DRM_MEM_BUFS);
491 }
492 }
493 drm_free(entry->buflist,
494 entry->buf_count *
495 sizeof(*entry->buflist), DRM_MEM_BUFS);
496
497 entry->buf_count = 0;
498 }
499 }
500
501 #if __OS_HAS_AGP
502 /**
503 * Add AGP buffers for DMA transfers.
504 *
505 * \param dev drm_device_t to which the buffers are to be added.
506 * \param request pointer to a drm_buf_desc_t describing the request.
507 * \return zero on success or a negative number on failure.
508 *
509 * After some sanity checks creates a drm_buf structure for each buffer and
510 * reallocates the buffer list of the same size order to accommodate the new
511 * buffers.
512 */
513 int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
514 {
515 drm_device_dma_t *dma = dev->dma;
516 drm_buf_entry_t *entry;
517 drm_buf_t *buf;
518 unsigned long offset;
519 unsigned long agp_offset;
520 int count;
521 int order;
522 int size;
523 int alignment;
524 int page_order;
525 int total;
526 int byte_count;
527 int i;
528 drm_buf_t **temp_buflist;
529
530 if (!dma)
531 return -EINVAL;
532
533 count = request->count;
534 order = drm_order(request->size);
535 size = 1 << order;
536
537 alignment = (request->flags & _DRM_PAGE_ALIGN)
538 ? PAGE_ALIGN(size) : size;
539 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
540 total = PAGE_SIZE << page_order;
541
542 byte_count = 0;
543 agp_offset = dev->agp->base + request->agp_start;
544
545 DRM_DEBUG("count: %d\n", count);
546 DRM_DEBUG("order: %d\n", order);
547 DRM_DEBUG("size: %d\n", size);
548 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
549 DRM_DEBUG("alignment: %d\n", alignment);
550 DRM_DEBUG("page_order: %d\n", page_order);
551 DRM_DEBUG("total: %d\n", total);
552
553 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
554 return -EINVAL;
555 if (dev->queue_count)
556 return -EBUSY; /* Not while in use */
557
558 spin_lock(&dev->count_lock);
559 if (dev->buf_use) {
560 spin_unlock(&dev->count_lock);
561 return -EBUSY;
562 }
563 atomic_inc(&dev->buf_alloc);
564 spin_unlock(&dev->count_lock);
565
566 mutex_lock(&dev->struct_mutex);
567 entry = &dma->bufs[order];
568 if (entry->buf_count) {
569 mutex_unlock(&dev->struct_mutex);
570 atomic_dec(&dev->buf_alloc);
571 return -ENOMEM; /* May only call once for each order */
572 }
573
574 if (count < 0 || count > 4096) {
575 mutex_unlock(&dev->struct_mutex);
576 atomic_dec(&dev->buf_alloc);
577 return -EINVAL;
578 }
579
580 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
581 DRM_MEM_BUFS);
582 if (!entry->buflist) {
583 mutex_unlock(&dev->struct_mutex);
584 atomic_dec(&dev->buf_alloc);
585 return -ENOMEM;
586 }
587 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
588
589 entry->buf_size = size;
590 entry->page_order = page_order;
591
592 offset = 0;
593
594 while (entry->buf_count < count) {
595 buf = &entry->buflist[entry->buf_count];
596 buf->idx = dma->buf_count + entry->buf_count;
597 buf->total = alignment;
598 buf->order = order;
599 buf->used = 0;
600
601 buf->offset = (dma->byte_count + offset);
602 buf->bus_address = agp_offset + offset;
603 buf->address = (void *)(agp_offset + offset);
604 buf->next = NULL;
605 buf->waiting = 0;
606 buf->pending = 0;
607 init_waitqueue_head(&buf->dma_wait);
608 buf->filp = NULL;
609
610 buf->dev_priv_size = dev->driver->dev_priv_size;
611 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
612 if (!buf->dev_private) {
613 /* Set count correctly so we free the proper amount. */
614 entry->buf_count = count;
615 drm_cleanup_buf_error(dev, entry);
616 mutex_unlock(&dev->struct_mutex);
617 atomic_dec(&dev->buf_alloc);
618 return -ENOMEM;
619 }
620 memset(buf->dev_private, 0, buf->dev_priv_size);
621
622 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
623
624 offset += alignment;
625 entry->buf_count++;
626 byte_count += PAGE_SIZE << page_order;
627 }
628
629 DRM_DEBUG("byte_count: %d\n", byte_count);
630
631 temp_buflist = drm_realloc(dma->buflist,
632 dma->buf_count * sizeof(*dma->buflist),
633 (dma->buf_count + entry->buf_count)
634 * sizeof(*dma->buflist), DRM_MEM_BUFS);
635 if (!temp_buflist) {
636 /* Free the entry because it isn't valid */
637 drm_cleanup_buf_error(dev, entry);
638 mutex_unlock(&dev->struct_mutex);
639 atomic_dec(&dev->buf_alloc);
640 return -ENOMEM;
641 }
642 dma->buflist = temp_buflist;
643
644 for (i = 0; i < entry->buf_count; i++) {
645 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
646 }
647
648 dma->buf_count += entry->buf_count;
649 dma->seg_count += entry->seg_count;
650 dma->page_count += byte_count >> PAGE_SHIFT;
651 dma->byte_count += byte_count;
652
653 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
654 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
655
656 mutex_unlock(&dev->struct_mutex);
657
658 request->count = entry->buf_count;
659 request->size = size;
660
661 dma->flags = _DRM_DMA_USE_AGP;
662
663 atomic_dec(&dev->buf_alloc);
664 return 0;
665 }
666 EXPORT_SYMBOL(drm_addbufs_agp);
667 #endif /* __OS_HAS_AGP */
668
669 int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
670 {
671 drm_device_dma_t *dma = dev->dma;
672 int count;
673 int order;
674 int size;
675 int total;
676 int page_order;
677 drm_buf_entry_t *entry;
678 drm_dma_handle_t *dmah;
679 drm_buf_t *buf;
680 int alignment;
681 unsigned long offset;
682 int i;
683 int byte_count;
684 int page_count;
685 unsigned long *temp_pagelist;
686 drm_buf_t **temp_buflist;
687
688 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
689 return -EINVAL;
690
691 if (!dma)
692 return -EINVAL;
693
694 if (!capable(CAP_SYS_ADMIN))
695 return -EPERM;
696
697 count = request->count;
698 order = drm_order(request->size);
699 size = 1 << order;
700
701 DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
702 request->count, request->size, size, order, dev->queue_count);
703
704 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
705 return -EINVAL;
706 if (dev->queue_count)
707 return -EBUSY; /* Not while in use */
708
709 alignment = (request->flags & _DRM_PAGE_ALIGN)
710 ? PAGE_ALIGN(size) : size;
711 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
712 total = PAGE_SIZE << page_order;
713
714 spin_lock(&dev->count_lock);
715 if (dev->buf_use) {
716 spin_unlock(&dev->count_lock);
717 return -EBUSY;
718 }
719 atomic_inc(&dev->buf_alloc);
720 spin_unlock(&dev->count_lock);
721
722 mutex_lock(&dev->struct_mutex);
723 entry = &dma->bufs[order];
724 if (entry->buf_count) {
725 mutex_unlock(&dev->struct_mutex);
726 atomic_dec(&dev->buf_alloc);
727 return -ENOMEM; /* May only call once for each order */
728 }
729
730 if (count < 0 || count > 4096) {
731 mutex_unlock(&dev->struct_mutex);
732 atomic_dec(&dev->buf_alloc);
733 return -EINVAL;
734 }
735
736 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
737 DRM_MEM_BUFS);
738 if (!entry->buflist) {
739 mutex_unlock(&dev->struct_mutex);
740 atomic_dec(&dev->buf_alloc);
741 return -ENOMEM;
742 }
743 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
744
745 entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
746 DRM_MEM_SEGS);
747 if (!entry->seglist) {
748 drm_free(entry->buflist,
749 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
750 mutex_unlock(&dev->struct_mutex);
751 atomic_dec(&dev->buf_alloc);
752 return -ENOMEM;
753 }
754 memset(entry->seglist, 0, count * sizeof(*entry->seglist));
755
756 /* Keep the original pagelist until we know all the allocations
757 * have succeeded
758 */
759 temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
760 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
761 if (!temp_pagelist) {
762 drm_free(entry->buflist,
763 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
764 drm_free(entry->seglist,
765 count * sizeof(*entry->seglist), DRM_MEM_SEGS);
766 mutex_unlock(&dev->struct_mutex);
767 atomic_dec(&dev->buf_alloc);
768 return -ENOMEM;
769 }
770 memcpy(temp_pagelist,
771 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
772 DRM_DEBUG("pagelist: %d entries\n",
773 dma->page_count + (count << page_order));
774
775 entry->buf_size = size;
776 entry->page_order = page_order;
777 byte_count = 0;
778 page_count = 0;
779
780 while (entry->buf_count < count) {
781
782 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
783
784 if (!dmah) {
785 /* Set count correctly so we free the proper amount. */
786 entry->buf_count = count;
787 entry->seg_count = count;
788 drm_cleanup_buf_error(dev, entry);
789 drm_free(temp_pagelist,
790 (dma->page_count + (count << page_order))
791 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
792 mutex_unlock(&dev->struct_mutex);
793 atomic_dec(&dev->buf_alloc);
794 return -ENOMEM;
795 }
796 entry->seglist[entry->seg_count++] = dmah;
797 for (i = 0; i < (1 << page_order); i++) {
798 DRM_DEBUG("page %d @ 0x%08lx\n",
799 dma->page_count + page_count,
800 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
801 temp_pagelist[dma->page_count + page_count++]
802 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
803 }
804 for (offset = 0;
805 offset + size <= total && entry->buf_count < count;
806 offset += alignment, ++entry->buf_count) {
807 buf = &entry->buflist[entry->buf_count];
808 buf->idx = dma->buf_count + entry->buf_count;
809 buf->total = alignment;
810 buf->order = order;
811 buf->used = 0;
812 buf->offset = (dma->byte_count + byte_count + offset);
813 buf->address = (void *)(dmah->vaddr + offset);
814 buf->bus_address = dmah->busaddr + offset;
815 buf->next = NULL;
816 buf->waiting = 0;
817 buf->pending = 0;
818 init_waitqueue_head(&buf->dma_wait);
819 buf->filp = NULL;
820
821 buf->dev_priv_size = dev->driver->dev_priv_size;
822 buf->dev_private = drm_alloc(buf->dev_priv_size,
823 DRM_MEM_BUFS);
824 if (!buf->dev_private) {
825 /* Set count correctly so we free the proper amount. */
826 entry->buf_count = count;
827 entry->seg_count = count;
828 drm_cleanup_buf_error(dev, entry);
829 drm_free(temp_pagelist,
830 (dma->page_count +
831 (count << page_order))
832 * sizeof(*dma->pagelist),
833 DRM_MEM_PAGES);
834 mutex_unlock(&dev->struct_mutex);
835 atomic_dec(&dev->buf_alloc);
836 return -ENOMEM;
837 }
838 memset(buf->dev_private, 0, buf->dev_priv_size);
839
840 DRM_DEBUG("buffer %d @ %p\n",
841 entry->buf_count, buf->address);
842 }
843 byte_count += PAGE_SIZE << page_order;
844 }
845
846 temp_buflist = drm_realloc(dma->buflist,
847 dma->buf_count * sizeof(*dma->buflist),
848 (dma->buf_count + entry->buf_count)
849 * sizeof(*dma->buflist), DRM_MEM_BUFS);
850 if (!temp_buflist) {
851 /* Free the entry because it isn't valid */
852 drm_cleanup_buf_error(dev, entry);
853 drm_free(temp_pagelist,
854 (dma->page_count + (count << page_order))
855 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
856 mutex_unlock(&dev->struct_mutex);
857 atomic_dec(&dev->buf_alloc);
858 return -ENOMEM;
859 }
860 dma->buflist = temp_buflist;
861
862 for (i = 0; i < entry->buf_count; i++) {
863 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
864 }
865
866 /* No allocations failed, so now we can replace the orginal pagelist
867 * with the new one.
868 */
869 if (dma->page_count) {
870 drm_free(dma->pagelist,
871 dma->page_count * sizeof(*dma->pagelist),
872 DRM_MEM_PAGES);
873 }
874 dma->pagelist = temp_pagelist;
875
876 dma->buf_count += entry->buf_count;
877 dma->seg_count += entry->seg_count;
878 dma->page_count += entry->seg_count << page_order;
879 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
880
881 mutex_unlock(&dev->struct_mutex);
882
883 request->count = entry->buf_count;
884 request->size = size;
885
886 atomic_dec(&dev->buf_alloc);
887 return 0;
888
889 }
890 EXPORT_SYMBOL(drm_addbufs_pci);
891
892 static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
893 {
894 drm_device_dma_t *dma = dev->dma;
895 drm_buf_entry_t *entry;
896 drm_buf_t *buf;
897 unsigned long offset;
898 unsigned long agp_offset;
899 int count;
900 int order;
901 int size;
902 int alignment;
903 int page_order;
904 int total;
905 int byte_count;
906 int i;
907 drm_buf_t **temp_buflist;
908
909 if (!drm_core_check_feature(dev, DRIVER_SG))
910 return -EINVAL;
911
912 if (!dma)
913 return -EINVAL;
914
915 if (!capable(CAP_SYS_ADMIN))
916 return -EPERM;
917
918 count = request->count;
919 order = drm_order(request->size);
920 size = 1 << order;
921
922 alignment = (request->flags & _DRM_PAGE_ALIGN)
923 ? PAGE_ALIGN(size) : size;
924 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
925 total = PAGE_SIZE << page_order;
926
927 byte_count = 0;
928 agp_offset = request->agp_start;
929
930 DRM_DEBUG("count: %d\n", count);
931 DRM_DEBUG("order: %d\n", order);
932 DRM_DEBUG("size: %d\n", size);
933 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
934 DRM_DEBUG("alignment: %d\n", alignment);
935 DRM_DEBUG("page_order: %d\n", page_order);
936 DRM_DEBUG("total: %d\n", total);
937
938 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
939 return -EINVAL;
940 if (dev->queue_count)
941 return -EBUSY; /* Not while in use */
942
943 spin_lock(&dev->count_lock);
944 if (dev->buf_use) {
945 spin_unlock(&dev->count_lock);
946 return -EBUSY;
947 }
948 atomic_inc(&dev->buf_alloc);
949 spin_unlock(&dev->count_lock);
950
951 mutex_lock(&dev->struct_mutex);
952 entry = &dma->bufs[order];
953 if (entry->buf_count) {
954 mutex_unlock(&dev->struct_mutex);
955 atomic_dec(&dev->buf_alloc);
956 return -ENOMEM; /* May only call once for each order */
957 }
958
959 if (count < 0 || count > 4096) {
960 mutex_unlock(&dev->struct_mutex);
961 atomic_dec(&dev->buf_alloc);
962 return -EINVAL;
963 }
964
965 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
966 DRM_MEM_BUFS);
967 if (!entry->buflist) {
968 mutex_unlock(&dev->struct_mutex);
969 atomic_dec(&dev->buf_alloc);
970 return -ENOMEM;
971 }
972 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
973
974 entry->buf_size = size;
975 entry->page_order = page_order;
976
977 offset = 0;
978
979 while (entry->buf_count < count) {
980 buf = &entry->buflist[entry->buf_count];
981 buf->idx = dma->buf_count + entry->buf_count;
982 buf->total = alignment;
983 buf->order = order;
984 buf->used = 0;
985
986 buf->offset = (dma->byte_count + offset);
987 buf->bus_address = agp_offset + offset;
988 buf->address = (void *)(agp_offset + offset
989 + (unsigned long)dev->sg->virtual);
990 buf->next = NULL;
991 buf->waiting = 0;
992 buf->pending = 0;
993 init_waitqueue_head(&buf->dma_wait);
994 buf->filp = NULL;
995
996 buf->dev_priv_size = dev->driver->dev_priv_size;
997 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
998 if (!buf->dev_private) {
999 /* Set count correctly so we free the proper amount. */
1000 entry->buf_count = count;
1001 drm_cleanup_buf_error(dev, entry);
1002 mutex_unlock(&dev->struct_mutex);
1003 atomic_dec(&dev->buf_alloc);
1004 return -ENOMEM;
1005 }
1006
1007 memset(buf->dev_private, 0, buf->dev_priv_size);
1008
1009 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1010
1011 offset += alignment;
1012 entry->buf_count++;
1013 byte_count += PAGE_SIZE << page_order;
1014 }
1015
1016 DRM_DEBUG("byte_count: %d\n", byte_count);
1017
1018 temp_buflist = drm_realloc(dma->buflist,
1019 dma->buf_count * sizeof(*dma->buflist),
1020 (dma->buf_count + entry->buf_count)
1021 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1022 if (!temp_buflist) {
1023 /* Free the entry because it isn't valid */
1024 drm_cleanup_buf_error(dev, entry);
1025 mutex_unlock(&dev->struct_mutex);
1026 atomic_dec(&dev->buf_alloc);
1027 return -ENOMEM;
1028 }
1029 dma->buflist = temp_buflist;
1030
1031 for (i = 0; i < entry->buf_count; i++) {
1032 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1033 }
1034
1035 dma->buf_count += entry->buf_count;
1036 dma->seg_count += entry->seg_count;
1037 dma->page_count += byte_count >> PAGE_SHIFT;
1038 dma->byte_count += byte_count;
1039
1040 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1041 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1042
1043 mutex_unlock(&dev->struct_mutex);
1044
1045 request->count = entry->buf_count;
1046 request->size = size;
1047
1048 dma->flags = _DRM_DMA_USE_SG;
1049
1050 atomic_dec(&dev->buf_alloc);
1051 return 0;
1052 }
1053
1054 static int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
1055 {
1056 drm_device_dma_t *dma = dev->dma;
1057 drm_buf_entry_t *entry;
1058 drm_buf_t *buf;
1059 unsigned long offset;
1060 unsigned long agp_offset;
1061 int count;
1062 int order;
1063 int size;
1064 int alignment;
1065 int page_order;
1066 int total;
1067 int byte_count;
1068 int i;
1069 drm_buf_t **temp_buflist;
1070
1071 if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1072 return -EINVAL;
1073
1074 if (!dma)
1075 return -EINVAL;
1076
1077 if (!capable(CAP_SYS_ADMIN))
1078 return -EPERM;
1079
1080 count = request->count;
1081 order = drm_order(request->size);
1082 size = 1 << order;
1083
1084 alignment = (request->flags & _DRM_PAGE_ALIGN)
1085 ? PAGE_ALIGN(size) : size;
1086 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1087 total = PAGE_SIZE << page_order;
1088
1089 byte_count = 0;
1090 agp_offset = request->agp_start;
1091
1092 DRM_DEBUG("count: %d\n", count);
1093 DRM_DEBUG("order: %d\n", order);
1094 DRM_DEBUG("size: %d\n", size);
1095 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1096 DRM_DEBUG("alignment: %d\n", alignment);
1097 DRM_DEBUG("page_order: %d\n", page_order);
1098 DRM_DEBUG("total: %d\n", total);
1099
1100 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1101 return -EINVAL;
1102 if (dev->queue_count)
1103 return -EBUSY; /* Not while in use */
1104
1105 spin_lock(&dev->count_lock);
1106 if (dev->buf_use) {
1107 spin_unlock(&dev->count_lock);
1108 return -EBUSY;
1109 }
1110 atomic_inc(&dev->buf_alloc);
1111 spin_unlock(&dev->count_lock);
1112
1113 mutex_lock(&dev->struct_mutex);
1114 entry = &dma->bufs[order];
1115 if (entry->buf_count) {
1116 mutex_unlock(&dev->struct_mutex);
1117 atomic_dec(&dev->buf_alloc);
1118 return -ENOMEM; /* May only call once for each order */
1119 }
1120
1121 if (count < 0 || count > 4096) {
1122 mutex_unlock(&dev->struct_mutex);
1123 atomic_dec(&dev->buf_alloc);
1124 return -EINVAL;
1125 }
1126
1127 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1128 DRM_MEM_BUFS);
1129 if (!entry->buflist) {
1130 mutex_unlock(&dev->struct_mutex);
1131 atomic_dec(&dev->buf_alloc);
1132 return -ENOMEM;
1133 }
1134 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1135
1136 entry->buf_size = size;
1137 entry->page_order = page_order;
1138
1139 offset = 0;
1140
1141 while (entry->buf_count < count) {
1142 buf = &entry->buflist[entry->buf_count];
1143 buf->idx = dma->buf_count + entry->buf_count;
1144 buf->total = alignment;
1145 buf->order = order;
1146 buf->used = 0;
1147
1148 buf->offset = (dma->byte_count + offset);
1149 buf->bus_address = agp_offset + offset;
1150 buf->address = (void *)(agp_offset + offset);
1151 buf->next = NULL;
1152 buf->waiting = 0;
1153 buf->pending = 0;
1154 init_waitqueue_head(&buf->dma_wait);
1155 buf->filp = NULL;
1156
1157 buf->dev_priv_size = dev->driver->dev_priv_size;
1158 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1159 if (!buf->dev_private) {
1160 /* Set count correctly so we free the proper amount. */
1161 entry->buf_count = count;
1162 drm_cleanup_buf_error(dev, entry);
1163 mutex_unlock(&dev->struct_mutex);
1164 atomic_dec(&dev->buf_alloc);
1165 return -ENOMEM;
1166 }
1167 memset(buf->dev_private, 0, buf->dev_priv_size);
1168
1169 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1170
1171 offset += alignment;
1172 entry->buf_count++;
1173 byte_count += PAGE_SIZE << page_order;
1174 }
1175
1176 DRM_DEBUG("byte_count: %d\n", byte_count);
1177
1178 temp_buflist = drm_realloc(dma->buflist,
1179 dma->buf_count * sizeof(*dma->buflist),
1180 (dma->buf_count + entry->buf_count)
1181 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1182 if (!temp_buflist) {
1183 /* Free the entry because it isn't valid */
1184 drm_cleanup_buf_error(dev, entry);
1185 mutex_unlock(&dev->struct_mutex);
1186 atomic_dec(&dev->buf_alloc);
1187 return -ENOMEM;
1188 }
1189 dma->buflist = temp_buflist;
1190
1191 for (i = 0; i < entry->buf_count; i++) {
1192 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1193 }
1194
1195 dma->buf_count += entry->buf_count;
1196 dma->seg_count += entry->seg_count;
1197 dma->page_count += byte_count >> PAGE_SHIFT;
1198 dma->byte_count += byte_count;
1199
1200 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1201 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1202
1203 mutex_unlock(&dev->struct_mutex);
1204
1205 request->count = entry->buf_count;
1206 request->size = size;
1207
1208 dma->flags = _DRM_DMA_USE_FB;
1209
1210 atomic_dec(&dev->buf_alloc);
1211 return 0;
1212 }
1213
1214
1215 /**
1216 * Add buffers for DMA transfers (ioctl).
1217 *
1218 * \param inode device inode.
1219 * \param filp file pointer.
1220 * \param cmd command.
1221 * \param arg pointer to a drm_buf_desc_t request.
1222 * \return zero on success or a negative number on failure.
1223 *
1224 * According with the memory type specified in drm_buf_desc::flags and the
1225 * build options, it dispatches the call either to addbufs_agp(),
1226 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1227 * PCI memory respectively.
1228 */
1229 int drm_addbufs(struct inode *inode, struct file *filp,
1230 unsigned int cmd, unsigned long arg)
1231 {
1232 drm_buf_desc_t request;
1233 drm_file_t *priv = filp->private_data;
1234 drm_device_t *dev = priv->head->dev;
1235 int ret;
1236
1237 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1238 return -EINVAL;
1239
1240 if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
1241 sizeof(request)))
1242 return -EFAULT;
1243
1244 #if __OS_HAS_AGP
1245 if (request.flags & _DRM_AGP_BUFFER)
1246 ret = drm_addbufs_agp(dev, &request);
1247 else
1248 #endif
1249 if (request.flags & _DRM_SG_BUFFER)
1250 ret = drm_addbufs_sg(dev, &request);
1251 else if (request.flags & _DRM_FB_BUFFER)
1252 ret = drm_addbufs_fb(dev, &request);
1253 else
1254 ret = drm_addbufs_pci(dev, &request);
1255
1256 if (ret == 0) {
1257 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1258 ret = -EFAULT;
1259 }
1260 }
1261 return ret;
1262 }
1263
1264 /**
1265 * Get information about the buffer mappings.
1266 *
1267 * This was originally mean for debugging purposes, or by a sophisticated
1268 * client library to determine how best to use the available buffers (e.g.,
1269 * large buffers can be used for image transfer).
1270 *
1271 * \param inode device inode.
1272 * \param filp file pointer.
1273 * \param cmd command.
1274 * \param arg pointer to a drm_buf_info structure.
1275 * \return zero on success or a negative number on failure.
1276 *
1277 * Increments drm_device::buf_use while holding the drm_device::count_lock
1278 * lock, preventing of allocating more buffers after this call. Information
1279 * about each requested buffer is then copied into user space.
1280 */
1281 int drm_infobufs(struct inode *inode, struct file *filp,
1282 unsigned int cmd, unsigned long arg)
1283 {
1284 drm_file_t *priv = filp->private_data;
1285 drm_device_t *dev = priv->head->dev;
1286 drm_device_dma_t *dma = dev->dma;
1287 drm_buf_info_t request;
1288 drm_buf_info_t __user *argp = (void __user *)arg;
1289 int i;
1290 int count;
1291
1292 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1293 return -EINVAL;
1294
1295 if (!dma)
1296 return -EINVAL;
1297
1298 spin_lock(&dev->count_lock);
1299 if (atomic_read(&dev->buf_alloc)) {
1300 spin_unlock(&dev->count_lock);
1301 return -EBUSY;
1302 }
1303 ++dev->buf_use; /* Can't allocate more after this call */
1304 spin_unlock(&dev->count_lock);
1305
1306 if (copy_from_user(&request, argp, sizeof(request)))
1307 return -EFAULT;
1308
1309 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1310 if (dma->bufs[i].buf_count)
1311 ++count;
1312 }
1313
1314 DRM_DEBUG("count = %d\n", count);
1315
1316 if (request.count >= count) {
1317 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1318 if (dma->bufs[i].buf_count) {
1319 drm_buf_desc_t __user *to =
1320 &request.list[count];
1321 drm_buf_entry_t *from = &dma->bufs[i];
1322 drm_freelist_t *list = &dma->bufs[i].freelist;
1323 if (copy_to_user(&to->count,
1324 &from->buf_count,
1325 sizeof(from->buf_count)) ||
1326 copy_to_user(&to->size,
1327 &from->buf_size,
1328 sizeof(from->buf_size)) ||
1329 copy_to_user(&to->low_mark,
1330 &list->low_mark,
1331 sizeof(list->low_mark)) ||
1332 copy_to_user(&to->high_mark,
1333 &list->high_mark,
1334 sizeof(list->high_mark)))
1335 return -EFAULT;
1336
1337 DRM_DEBUG("%d %d %d %d %d\n",
1338 i,
1339 dma->bufs[i].buf_count,
1340 dma->bufs[i].buf_size,
1341 dma->bufs[i].freelist.low_mark,
1342 dma->bufs[i].freelist.high_mark);
1343 ++count;
1344 }
1345 }
1346 }
1347 request.count = count;
1348
1349 if (copy_to_user(argp, &request, sizeof(request)))
1350 return -EFAULT;
1351
1352 return 0;
1353 }
1354
1355 /**
1356 * Specifies a low and high water mark for buffer allocation
1357 *
1358 * \param inode device inode.
1359 * \param filp file pointer.
1360 * \param cmd command.
1361 * \param arg a pointer to a drm_buf_desc structure.
1362 * \return zero on success or a negative number on failure.
1363 *
1364 * Verifies that the size order is bounded between the admissible orders and
1365 * updates the respective drm_device_dma::bufs entry low and high water mark.
1366 *
1367 * \note This ioctl is deprecated and mostly never used.
1368 */
1369 int drm_markbufs(struct inode *inode, struct file *filp,
1370 unsigned int cmd, unsigned long arg)
1371 {
1372 drm_file_t *priv = filp->private_data;
1373 drm_device_t *dev = priv->head->dev;
1374 drm_device_dma_t *dma = dev->dma;
1375 drm_buf_desc_t request;
1376 int order;
1377 drm_buf_entry_t *entry;
1378
1379 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1380 return -EINVAL;
1381
1382 if (!dma)
1383 return -EINVAL;
1384
1385 if (copy_from_user(&request,
1386 (drm_buf_desc_t __user *) arg, sizeof(request)))
1387 return -EFAULT;
1388
1389 DRM_DEBUG("%d, %d, %d\n",
1390 request.size, request.low_mark, request.high_mark);
1391 order = drm_order(request.size);
1392 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1393 return -EINVAL;
1394 entry = &dma->bufs[order];
1395
1396 if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1397 return -EINVAL;
1398 if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1399 return -EINVAL;
1400
1401 entry->freelist.low_mark = request.low_mark;
1402 entry->freelist.high_mark = request.high_mark;
1403
1404 return 0;
1405 }
1406
1407 /**
1408 * Unreserve the buffers in list, previously reserved using drmDMA.
1409 *
1410 * \param inode device inode.
1411 * \param filp file pointer.
1412 * \param cmd command.
1413 * \param arg pointer to a drm_buf_free structure.
1414 * \return zero on success or a negative number on failure.
1415 *
1416 * Calls free_buffer() for each used buffer.
1417 * This function is primarily used for debugging.
1418 */
1419 int drm_freebufs(struct inode *inode, struct file *filp,
1420 unsigned int cmd, unsigned long arg)
1421 {
1422 drm_file_t *priv = filp->private_data;
1423 drm_device_t *dev = priv->head->dev;
1424 drm_device_dma_t *dma = dev->dma;
1425 drm_buf_free_t request;
1426 int i;
1427 int idx;
1428 drm_buf_t *buf;
1429
1430 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1431 return -EINVAL;
1432
1433 if (!dma)
1434 return -EINVAL;
1435
1436 if (copy_from_user(&request,
1437 (drm_buf_free_t __user *) arg, sizeof(request)))
1438 return -EFAULT;
1439
1440 DRM_DEBUG("%d\n", request.count);
1441 for (i = 0; i < request.count; i++) {
1442 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1443 return -EFAULT;
1444 if (idx < 0 || idx >= dma->buf_count) {
1445 DRM_ERROR("Index %d (of %d max)\n",
1446 idx, dma->buf_count - 1);
1447 return -EINVAL;
1448 }
1449 buf = dma->buflist[idx];
1450 if (buf->filp != filp) {
1451 DRM_ERROR("Process %d freeing buffer not owned\n",
1452 current->pid);
1453 return -EINVAL;
1454 }
1455 drm_free_buffer(dev, buf);
1456 }
1457
1458 return 0;
1459 }
1460
1461 /**
1462 * Maps all of the DMA buffers into client-virtual space (ioctl).
1463 *
1464 * \param inode device inode.
1465 * \param filp file pointer.
1466 * \param cmd command.
1467 * \param arg pointer to a drm_buf_map structure.
1468 * \return zero on success or a negative number on failure.
1469 *
1470 * Maps the AGP or SG buffer region with do_mmap(), and copies information
1471 * about each buffer into user space. The PCI buffers are already mapped on the
1472 * addbufs_pci() call.
1473 */
1474 int drm_mapbufs(struct inode *inode, struct file *filp,
1475 unsigned int cmd, unsigned long arg)
1476 {
1477 drm_file_t *priv = filp->private_data;
1478 drm_device_t *dev = priv->head->dev;
1479 drm_device_dma_t *dma = dev->dma;
1480 drm_buf_map_t __user *argp = (void __user *)arg;
1481 int retcode = 0;
1482 const int zero = 0;
1483 unsigned long virtual;
1484 unsigned long address;
1485 drm_buf_map_t request;
1486 int i;
1487
1488 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1489 return -EINVAL;
1490
1491 if (!dma)
1492 return -EINVAL;
1493
1494 spin_lock(&dev->count_lock);
1495 if (atomic_read(&dev->buf_alloc)) {
1496 spin_unlock(&dev->count_lock);
1497 return -EBUSY;
1498 }
1499 dev->buf_use++; /* Can't allocate more after this call */
1500 spin_unlock(&dev->count_lock);
1501
1502 if (copy_from_user(&request, argp, sizeof(request)))
1503 return -EFAULT;
1504
1505 if (request.count >= dma->buf_count) {
1506 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1507 || (drm_core_check_feature(dev, DRIVER_SG)
1508 && (dma->flags & _DRM_DMA_USE_SG))
1509 || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1510 && (dma->flags & _DRM_DMA_USE_FB))) {
1511 drm_map_t *map = dev->agp_buffer_map;
1512 unsigned long token = dev->agp_buffer_token;
1513
1514 if (!map) {
1515 retcode = -EINVAL;
1516 goto done;
1517 }
1518
1519 down_write(&current->mm->mmap_sem);
1520 virtual = do_mmap(filp, 0, map->size,
1521 PROT_READ | PROT_WRITE,
1522 MAP_SHARED, token);
1523 up_write(&current->mm->mmap_sem);
1524 } else {
1525 down_write(&current->mm->mmap_sem);
1526 virtual = do_mmap(filp, 0, dma->byte_count,
1527 PROT_READ | PROT_WRITE,
1528 MAP_SHARED, 0);
1529 up_write(&current->mm->mmap_sem);
1530 }
1531 if (virtual > -1024UL) {
1532 /* Real error */
1533 retcode = (signed long)virtual;
1534 goto done;
1535 }
1536 request.virtual = (void __user *)virtual;
1537
1538 for (i = 0; i < dma->buf_count; i++) {
1539 if (copy_to_user(&request.list[i].idx,
1540 &dma->buflist[i]->idx,
1541 sizeof(request.list[0].idx))) {
1542 retcode = -EFAULT;
1543 goto done;
1544 }
1545 if (copy_to_user(&request.list[i].total,
1546 &dma->buflist[i]->total,
1547 sizeof(request.list[0].total))) {
1548 retcode = -EFAULT;
1549 goto done;
1550 }
1551 if (copy_to_user(&request.list[i].used,
1552 &zero, sizeof(zero))) {
1553 retcode = -EFAULT;
1554 goto done;
1555 }
1556 address = virtual + dma->buflist[i]->offset; /* *** */
1557 if (copy_to_user(&request.list[i].address,
1558 &address, sizeof(address))) {
1559 retcode = -EFAULT;
1560 goto done;
1561 }
1562 }
1563 }
1564 done:
1565 request.count = dma->buf_count;
1566 DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1567
1568 if (copy_to_user(argp, &request, sizeof(request)))
1569 return -EFAULT;
1570
1571 return retcode;
1572 }
1573
1574 /**
1575 * Compute size order. Returns the exponent of the smaller power of two which
1576 * is greater or equal to given number.
1577 *
1578 * \param size size.
1579 * \return order.
1580 *
1581 * \todo Can be made faster.
1582 */
1583 int drm_order(unsigned long size)
1584 {
1585 int order;
1586 unsigned long tmp;
1587
1588 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1589
1590 if (size & (size - 1))
1591 ++order;
1592
1593 return order;
1594 }
1595 EXPORT_SYMBOL(drm_order);
1596
1597
ubuntu-bionic-kernel mirror