1 /*
2 * Legacy: Generic DRM Buffer Management
3 *
4 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * All Rights Reserved.
7 *
8 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
9 * Author: Gareth Hughes <gareth@valinux.com>
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
17 *
18 * The above copyright notice and this permission notice (including the next
19 * paragraph) shall be included in all copies or substantial portions of the
20 * Software.
21 *
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28 * OTHER DEALINGS IN THE SOFTWARE.
29 */
30
31 #include <linux/vmalloc.h>
32 #include <linux/slab.h>
33 #include <linux/log2.h>
34 #include <linux/export.h>
35 #include <asm/shmparam.h>
36 #include <drm/drmP.h>
37 #include "drm_legacy.h"
38
39 #include <linux/nospec.h>
40
drm_find_matching_map(struct drm_device * dev,struct drm_local_map * map)41 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
42 struct drm_local_map *map)
43 {
44 struct drm_map_list *entry;
45 list_for_each_entry(entry, &dev->maplist, head) {
46 /*
47 * Because the kernel-userspace ABI is fixed at a 32-bit offset
48 * while PCI resources may live above that, we only compare the
49 * lower 32 bits of the map offset for maps of type
50 * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
51 * It is assumed that if a driver have more than one resource
52 * of each type, the lower 32 bits are different.
53 */
54 if (!entry->map ||
55 map->type != entry->map->type ||
56 entry->master != dev->primary->master)
57 continue;
58 switch (map->type) {
59 case _DRM_SHM:
60 if (map->flags != _DRM_CONTAINS_LOCK)
61 break;
62 return entry;
63 case _DRM_REGISTERS:
64 case _DRM_FRAME_BUFFER:
65 if ((entry->map->offset & 0xffffffff) ==
66 (map->offset & 0xffffffff))
67 return entry;
68 default: /* Make gcc happy */
69 ;
70 }
71 if (entry->map->offset == map->offset)
72 return entry;
73 }
74
75 return NULL;
76 }
77
drm_map_handle(struct drm_device * dev,struct drm_hash_item * hash,unsigned long user_token,int hashed_handle,int shm)78 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
79 unsigned long user_token, int hashed_handle, int shm)
80 {
81 int use_hashed_handle, shift;
82 unsigned long add;
83
84 #if (BITS_PER_LONG == 64)
85 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
86 #elif (BITS_PER_LONG == 32)
87 use_hashed_handle = hashed_handle;
88 #else
89 #error Unsupported long size. Neither 64 nor 32 bits.
90 #endif
91
92 if (!use_hashed_handle) {
93 int ret;
94 hash->key = user_token >> PAGE_SHIFT;
95 ret = drm_ht_insert_item(&dev->map_hash, hash);
96 if (ret != -EINVAL)
97 return ret;
98 }
99
100 shift = 0;
101 add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
102 if (shm && (SHMLBA > PAGE_SIZE)) {
103 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
104
105 /* For shared memory, we have to preserve the SHMLBA
106 * bits of the eventual vma->vm_pgoff value during
107 * mmap(). Otherwise we run into cache aliasing problems
108 * on some platforms. On these platforms, the pgoff of
109 * a mmap() request is used to pick a suitable virtual
110 * address for the mmap() region such that it will not
111 * cause cache aliasing problems.
112 *
113 * Therefore, make sure the SHMLBA relevant bits of the
114 * hash value we use are equal to those in the original
115 * kernel virtual address.
116 */
117 shift = bits;
118 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
119 }
120
121 return drm_ht_just_insert_please(&dev->map_hash, hash,
122 user_token, 32 - PAGE_SHIFT - 3,
123 shift, add);
124 }
125
126 /**
127 * Core function to create a range of memory available for mapping by a
128 * non-root process.
129 *
130 * Adjusts the memory offset to its absolute value according to the mapping
131 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
132 * applicable and if supported by the kernel.
133 */
drm_addmap_core(struct drm_device * dev,resource_size_t offset,unsigned int size,enum drm_map_type type,enum drm_map_flags flags,struct drm_map_list ** maplist)134 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
135 unsigned int size, enum drm_map_type type,
136 enum drm_map_flags flags,
137 struct drm_map_list ** maplist)
138 {
139 struct drm_local_map *map;
140 struct drm_map_list *list;
141 drm_dma_handle_t *dmah;
142 unsigned long user_token;
143 int ret;
144
145 map = kmalloc(sizeof(*map), GFP_KERNEL);
146 if (!map)
147 return -ENOMEM;
148
149 map->offset = offset;
150 map->size = size;
151 map->flags = flags;
152 map->type = type;
153
154 /* Only allow shared memory to be removable since we only keep enough
155 * book keeping information about shared memory to allow for removal
156 * when processes fork.
157 */
158 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
159 kfree(map);
160 return -EINVAL;
161 }
162 DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
163 (unsigned long long)map->offset, map->size, map->type);
164
165 /* page-align _DRM_SHM maps. They are allocated here so there is no security
166 * hole created by that and it works around various broken drivers that use
167 * a non-aligned quantity to map the SAREA. --BenH
168 */
169 if (map->type == _DRM_SHM)
170 map->size = PAGE_ALIGN(map->size);
171
172 if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
173 kfree(map);
174 return -EINVAL;
175 }
176 map->mtrr = -1;
177 map->handle = NULL;
178
179 switch (map->type) {
180 case _DRM_REGISTERS:
181 case _DRM_FRAME_BUFFER:
182 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
183 if (map->offset + (map->size-1) < map->offset ||
184 map->offset < virt_to_phys(high_memory)) {
185 kfree(map);
186 return -EINVAL;
187 }
188 #endif
189 /* Some drivers preinitialize some maps, without the X Server
190 * needing to be aware of it. Therefore, we just return success
191 * when the server tries to create a duplicate map.
192 */
193 list = drm_find_matching_map(dev, map);
194 if (list != NULL) {
195 if (list->map->size != map->size) {
196 DRM_DEBUG("Matching maps of type %d with "
197 "mismatched sizes, (%ld vs %ld)\n",
198 map->type, map->size,
199 list->map->size);
200 list->map->size = map->size;
201 }
202
203 kfree(map);
204 *maplist = list;
205 return 0;
206 }
207
208 if (map->type == _DRM_FRAME_BUFFER ||
209 (map->flags & _DRM_WRITE_COMBINING)) {
210 map->mtrr =
211 arch_phys_wc_add(map->offset, map->size);
212 }
213 if (map->type == _DRM_REGISTERS) {
214 if (map->flags & _DRM_WRITE_COMBINING)
215 map->handle = ioremap_wc(map->offset,
216 map->size);
217 else
218 map->handle = ioremap(map->offset, map->size);
219 if (!map->handle) {
220 kfree(map);
221 return -ENOMEM;
222 }
223 }
224
225 break;
226 case _DRM_SHM:
227 list = drm_find_matching_map(dev, map);
228 if (list != NULL) {
229 if(list->map->size != map->size) {
230 DRM_DEBUG("Matching maps of type %d with "
231 "mismatched sizes, (%ld vs %ld)\n",
232 map->type, map->size, list->map->size);
233 list->map->size = map->size;
234 }
235
236 kfree(map);
237 *maplist = list;
238 return 0;
239 }
240 map->handle = vmalloc_user(map->size);
241 DRM_DEBUG("%lu %d %p\n",
242 map->size, order_base_2(map->size), map->handle);
243 if (!map->handle) {
244 kfree(map);
245 return -ENOMEM;
246 }
247 map->offset = (unsigned long)map->handle;
248 if (map->flags & _DRM_CONTAINS_LOCK) {
249 /* Prevent a 2nd X Server from creating a 2nd lock */
250 if (dev->primary->master->lock.hw_lock != NULL) {
251 vfree(map->handle);
252 kfree(map);
253 return -EBUSY;
254 }
255 dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */
256 }
257 break;
258 case _DRM_AGP: {
259 struct drm_agp_mem *entry;
260 int valid = 0;
261
262 if (!dev->agp) {
263 kfree(map);
264 return -EINVAL;
265 }
266 #ifdef __alpha__
267 map->offset += dev->hose->mem_space->start;
268 #endif
269 /* In some cases (i810 driver), user space may have already
270 * added the AGP base itself, because dev->agp->base previously
271 * only got set during AGP enable. So, only add the base
272 * address if the map's offset isn't already within the
273 * aperture.
274 */
275 if (map->offset < dev->agp->base ||
276 map->offset > dev->agp->base +
277 dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
278 map->offset += dev->agp->base;
279 }
280 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
281
282 /* This assumes the DRM is in total control of AGP space.
283 * It's not always the case as AGP can be in the control
284 * of user space (i.e. i810 driver). So this loop will get
285 * skipped and we double check that dev->agp->memory is
286 * actually set as well as being invalid before EPERM'ing
287 */
288 list_for_each_entry(entry, &dev->agp->memory, head) {
289 if ((map->offset >= entry->bound) &&
290 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
291 valid = 1;
292 break;
293 }
294 }
295 if (!list_empty(&dev->agp->memory) && !valid) {
296 kfree(map);
297 return -EPERM;
298 }
299 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
300 (unsigned long long)map->offset, map->size);
301
302 break;
303 }
304 case _DRM_SCATTER_GATHER:
305 if (!dev->sg) {
306 kfree(map);
307 return -EINVAL;
308 }
309 map->offset += (unsigned long)dev->sg->virtual;
310 break;
311 case _DRM_CONSISTENT:
312 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
313 * As we're limiting the address to 2^32-1 (or less),
314 * casting it down to 32 bits is no problem, but we
315 * need to point to a 64bit variable first. */
316 dmah = drm_pci_alloc(dev, map->size, map->size);
317 if (!dmah) {
318 kfree(map);
319 return -ENOMEM;
320 }
321 map->handle = dmah->vaddr;
322 map->offset = (unsigned long)dmah->busaddr;
323 kfree(dmah);
324 break;
325 default:
326 kfree(map);
327 return -EINVAL;
328 }
329
330 list = kzalloc(sizeof(*list), GFP_KERNEL);
331 if (!list) {
332 if (map->type == _DRM_REGISTERS)
333 iounmap(map->handle);
334 kfree(map);
335 return -EINVAL;
336 }
337 list->map = map;
338
339 mutex_lock(&dev->struct_mutex);
340 list_add(&list->head, &dev->maplist);
341
342 /* Assign a 32-bit handle */
343 /* We do it here so that dev->struct_mutex protects the increment */
344 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
345 map->offset;
346 ret = drm_map_handle(dev, &list->hash, user_token, 0,
347 (map->type == _DRM_SHM));
348 if (ret) {
349 if (map->type == _DRM_REGISTERS)
350 iounmap(map->handle);
351 kfree(map);
352 kfree(list);
353 mutex_unlock(&dev->struct_mutex);
354 return ret;
355 }
356
357 list->user_token = list->hash.key << PAGE_SHIFT;
358 mutex_unlock(&dev->struct_mutex);
359
360 if (!(map->flags & _DRM_DRIVER))
361 list->master = dev->primary->master;
362 *maplist = list;
363 return 0;
364 }
365
drm_legacy_addmap(struct drm_device * dev,resource_size_t offset,unsigned int size,enum drm_map_type type,enum drm_map_flags flags,struct drm_local_map ** map_ptr)366 int drm_legacy_addmap(struct drm_device * dev, resource_size_t offset,
367 unsigned int size, enum drm_map_type type,
368 enum drm_map_flags flags, struct drm_local_map **map_ptr)
369 {
370 struct drm_map_list *list;
371 int rc;
372
373 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
374 if (!rc)
375 *map_ptr = list->map;
376 return rc;
377 }
378 EXPORT_SYMBOL(drm_legacy_addmap);
379
380 /**
381 * Ioctl to specify a range of memory that is available for mapping by a
382 * non-root process.
383 *
384 * \param inode device inode.
385 * \param file_priv DRM file private.
386 * \param cmd command.
387 * \param arg pointer to a drm_map structure.
388 * \return zero on success or a negative value on error.
389 *
390 */
drm_legacy_addmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)391 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
392 struct drm_file *file_priv)
393 {
394 struct drm_map *map = data;
395 struct drm_map_list *maplist;
396 int err;
397
398 if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
399 return -EPERM;
400
401 err = drm_addmap_core(dev, map->offset, map->size, map->type,
402 map->flags, &maplist);
403
404 if (err)
405 return err;
406
407 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
408 map->handle = (void *)(unsigned long)maplist->user_token;
409
410 /*
411 * It appears that there are no users of this value whatsoever --
412 * drmAddMap just discards it. Let's not encourage its use.
413 * (Keeping drm_addmap_core's returned mtrr value would be wrong --
414 * it's not a real mtrr index anymore.)
415 */
416 map->mtrr = -1;
417
418 return 0;
419 }
420
421 /**
422 * Remove a map private from list and deallocate resources if the mapping
423 * isn't in use.
424 *
425 * Searches the map on drm_device::maplist, removes it from the list, see if
426 * its being used, and free any associate resource (such as MTRR's) if it's not
427 * being on use.
428 *
429 * \sa drm_legacy_addmap
430 */
drm_legacy_rmmap_locked(struct drm_device * dev,struct drm_local_map * map)431 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
432 {
433 struct drm_map_list *r_list = NULL, *list_t;
434 drm_dma_handle_t dmah;
435 int found = 0;
436 struct drm_master *master;
437
438 /* Find the list entry for the map and remove it */
439 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
440 if (r_list->map == map) {
441 master = r_list->master;
442 list_del(&r_list->head);
443 drm_ht_remove_key(&dev->map_hash,
444 r_list->user_token >> PAGE_SHIFT);
445 kfree(r_list);
446 found = 1;
447 break;
448 }
449 }
450
451 if (!found)
452 return -EINVAL;
453
454 switch (map->type) {
455 case _DRM_REGISTERS:
456 iounmap(map->handle);
457 /* FALLTHROUGH */
458 case _DRM_FRAME_BUFFER:
459 arch_phys_wc_del(map->mtrr);
460 break;
461 case _DRM_SHM:
462 vfree(map->handle);
463 if (master) {
464 if (dev->sigdata.lock == master->lock.hw_lock)
465 dev->sigdata.lock = NULL;
466 master->lock.hw_lock = NULL; /* SHM removed */
467 master->lock.file_priv = NULL;
468 wake_up_interruptible_all(&master->lock.lock_queue);
469 }
470 break;
471 case _DRM_AGP:
472 case _DRM_SCATTER_GATHER:
473 break;
474 case _DRM_CONSISTENT:
475 dmah.vaddr = map->handle;
476 dmah.busaddr = map->offset;
477 dmah.size = map->size;
478 __drm_legacy_pci_free(dev, &dmah);
479 break;
480 }
481 kfree(map);
482
483 return 0;
484 }
485 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
486
drm_legacy_rmmap(struct drm_device * dev,struct drm_local_map * map)487 int drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
488 {
489 int ret;
490
491 mutex_lock(&dev->struct_mutex);
492 ret = drm_legacy_rmmap_locked(dev, map);
493 mutex_unlock(&dev->struct_mutex);
494
495 return ret;
496 }
497 EXPORT_SYMBOL(drm_legacy_rmmap);
498
499 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
500 * the last close of the device, and this is necessary for cleanup when things
501 * exit uncleanly. Therefore, having userland manually remove mappings seems
502 * like a pointless exercise since they're going away anyway.
503 *
504 * One use case might be after addmap is allowed for normal users for SHM and
505 * gets used by drivers that the server doesn't need to care about. This seems
506 * unlikely.
507 *
508 * \param inode device inode.
509 * \param file_priv DRM file private.
510 * \param cmd command.
511 * \param arg pointer to a struct drm_map structure.
512 * \return zero on success or a negative value on error.
513 */
drm_legacy_rmmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)514 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
515 struct drm_file *file_priv)
516 {
517 struct drm_map *request = data;
518 struct drm_local_map *map = NULL;
519 struct drm_map_list *r_list;
520 int ret;
521
522 mutex_lock(&dev->struct_mutex);
523 list_for_each_entry(r_list, &dev->maplist, head) {
524 if (r_list->map &&
525 r_list->user_token == (unsigned long)request->handle &&
526 r_list->map->flags & _DRM_REMOVABLE) {
527 map = r_list->map;
528 break;
529 }
530 }
531
532 /* List has wrapped around to the head pointer, or its empty we didn't
533 * find anything.
534 */
535 if (list_empty(&dev->maplist) || !map) {
536 mutex_unlock(&dev->struct_mutex);
537 return -EINVAL;
538 }
539
540 /* Register and framebuffer maps are permanent */
541 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
542 mutex_unlock(&dev->struct_mutex);
543 return 0;
544 }
545
546 ret = drm_legacy_rmmap_locked(dev, map);
547
548 mutex_unlock(&dev->struct_mutex);
549
550 return ret;
551 }
552
553 /**
554 * Cleanup after an error on one of the addbufs() functions.
555 *
556 * \param dev DRM device.
557 * \param entry buffer entry where the error occurred.
558 *
559 * Frees any pages and buffers associated with the given entry.
560 */
drm_cleanup_buf_error(struct drm_device * dev,struct drm_buf_entry * entry)561 static void drm_cleanup_buf_error(struct drm_device * dev,
562 struct drm_buf_entry * entry)
563 {
564 int i;
565
566 if (entry->seg_count) {
567 for (i = 0; i < entry->seg_count; i++) {
568 if (entry->seglist[i]) {
569 drm_pci_free(dev, entry->seglist[i]);
570 }
571 }
572 kfree(entry->seglist);
573
574 entry->seg_count = 0;
575 }
576
577 if (entry->buf_count) {
578 for (i = 0; i < entry->buf_count; i++) {
579 kfree(entry->buflist[i].dev_private);
580 }
581 kfree(entry->buflist);
582
583 entry->buf_count = 0;
584 }
585 }
586
587 #if IS_ENABLED(CONFIG_AGP)
588 /**
589 * Add AGP buffers for DMA transfers.
590 *
591 * \param dev struct drm_device to which the buffers are to be added.
592 * \param request pointer to a struct drm_buf_desc describing the request.
593 * \return zero on success or a negative number on failure.
594 *
595 * After some sanity checks creates a drm_buf structure for each buffer and
596 * reallocates the buffer list of the same size order to accommodate the new
597 * buffers.
598 */
drm_legacy_addbufs_agp(struct drm_device * dev,struct drm_buf_desc * request)599 int drm_legacy_addbufs_agp(struct drm_device *dev,
600 struct drm_buf_desc *request)
601 {
602 struct drm_device_dma *dma = dev->dma;
603 struct drm_buf_entry *entry;
604 struct drm_agp_mem *agp_entry;
605 struct drm_buf *buf;
606 unsigned long offset;
607 unsigned long agp_offset;
608 int count;
609 int order;
610 int size;
611 int alignment;
612 int page_order;
613 int total;
614 int byte_count;
615 int i, valid;
616 struct drm_buf **temp_buflist;
617
618 if (!dma)
619 return -EINVAL;
620
621 count = request->count;
622 order = order_base_2(request->size);
623 size = 1 << order;
624
625 alignment = (request->flags & _DRM_PAGE_ALIGN)
626 ? PAGE_ALIGN(size) : size;
627 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
628 total = PAGE_SIZE << page_order;
629
630 byte_count = 0;
631 agp_offset = dev->agp->base + request->agp_start;
632
633 DRM_DEBUG("count: %d\n", count);
634 DRM_DEBUG("order: %d\n", order);
635 DRM_DEBUG("size: %d\n", size);
636 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
637 DRM_DEBUG("alignment: %d\n", alignment);
638 DRM_DEBUG("page_order: %d\n", page_order);
639 DRM_DEBUG("total: %d\n", total);
640
641 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
642 return -EINVAL;
643
644 /* Make sure buffers are located in AGP memory that we own */
645 valid = 0;
646 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
647 if ((agp_offset >= agp_entry->bound) &&
648 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
649 valid = 1;
650 break;
651 }
652 }
653 if (!list_empty(&dev->agp->memory) && !valid) {
654 DRM_DEBUG("zone invalid\n");
655 return -EINVAL;
656 }
657 spin_lock(&dev->buf_lock);
658 if (dev->buf_use) {
659 spin_unlock(&dev->buf_lock);
660 return -EBUSY;
661 }
662 atomic_inc(&dev->buf_alloc);
663 spin_unlock(&dev->buf_lock);
664
665 mutex_lock(&dev->struct_mutex);
666 entry = &dma->bufs[order];
667 if (entry->buf_count) {
668 mutex_unlock(&dev->struct_mutex);
669 atomic_dec(&dev->buf_alloc);
670 return -ENOMEM; /* May only call once for each order */
671 }
672
673 if (count < 0 || count > 4096) {
674 mutex_unlock(&dev->struct_mutex);
675 atomic_dec(&dev->buf_alloc);
676 return -EINVAL;
677 }
678
679 entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
680 if (!entry->buflist) {
681 mutex_unlock(&dev->struct_mutex);
682 atomic_dec(&dev->buf_alloc);
683 return -ENOMEM;
684 }
685
686 entry->buf_size = size;
687 entry->page_order = page_order;
688
689 offset = 0;
690
691 while (entry->buf_count < count) {
692 buf = &entry->buflist[entry->buf_count];
693 buf->idx = dma->buf_count + entry->buf_count;
694 buf->total = alignment;
695 buf->order = order;
696 buf->used = 0;
697
698 buf->offset = (dma->byte_count + offset);
699 buf->bus_address = agp_offset + offset;
700 buf->address = (void *)(agp_offset + offset);
701 buf->next = NULL;
702 buf->waiting = 0;
703 buf->pending = 0;
704 buf->file_priv = NULL;
705
706 buf->dev_priv_size = dev->driver->dev_priv_size;
707 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
708 if (!buf->dev_private) {
709 /* Set count correctly so we free the proper amount. */
710 entry->buf_count = count;
711 drm_cleanup_buf_error(dev, entry);
712 mutex_unlock(&dev->struct_mutex);
713 atomic_dec(&dev->buf_alloc);
714 return -ENOMEM;
715 }
716
717 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
718
719 offset += alignment;
720 entry->buf_count++;
721 byte_count += PAGE_SIZE << page_order;
722 }
723
724 DRM_DEBUG("byte_count: %d\n", byte_count);
725
726 temp_buflist = krealloc(dma->buflist,
727 (dma->buf_count + entry->buf_count) *
728 sizeof(*dma->buflist), GFP_KERNEL);
729 if (!temp_buflist) {
730 /* Free the entry because it isn't valid */
731 drm_cleanup_buf_error(dev, entry);
732 mutex_unlock(&dev->struct_mutex);
733 atomic_dec(&dev->buf_alloc);
734 return -ENOMEM;
735 }
736 dma->buflist = temp_buflist;
737
738 for (i = 0; i < entry->buf_count; i++) {
739 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
740 }
741
742 dma->buf_count += entry->buf_count;
743 dma->seg_count += entry->seg_count;
744 dma->page_count += byte_count >> PAGE_SHIFT;
745 dma->byte_count += byte_count;
746
747 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
748 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
749
750 mutex_unlock(&dev->struct_mutex);
751
752 request->count = entry->buf_count;
753 request->size = size;
754
755 dma->flags = _DRM_DMA_USE_AGP;
756
757 atomic_dec(&dev->buf_alloc);
758 return 0;
759 }
760 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
761 #endif /* CONFIG_AGP */
762
drm_legacy_addbufs_pci(struct drm_device * dev,struct drm_buf_desc * request)763 int drm_legacy_addbufs_pci(struct drm_device *dev,
764 struct drm_buf_desc *request)
765 {
766 struct drm_device_dma *dma = dev->dma;
767 int count;
768 int order;
769 int size;
770 int total;
771 int page_order;
772 struct drm_buf_entry *entry;
773 drm_dma_handle_t *dmah;
774 struct drm_buf *buf;
775 int alignment;
776 unsigned long offset;
777 int i;
778 int byte_count;
779 int page_count;
780 unsigned long *temp_pagelist;
781 struct drm_buf **temp_buflist;
782
783 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
784 return -EINVAL;
785
786 if (!dma)
787 return -EINVAL;
788
789 if (!capable(CAP_SYS_ADMIN))
790 return -EPERM;
791
792 count = request->count;
793 order = order_base_2(request->size);
794 size = 1 << order;
795
796 DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
797 request->count, request->size, size, order);
798
799 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
800 return -EINVAL;
801
802 alignment = (request->flags & _DRM_PAGE_ALIGN)
803 ? PAGE_ALIGN(size) : size;
804 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
805 total = PAGE_SIZE << page_order;
806
807 spin_lock(&dev->buf_lock);
808 if (dev->buf_use) {
809 spin_unlock(&dev->buf_lock);
810 return -EBUSY;
811 }
812 atomic_inc(&dev->buf_alloc);
813 spin_unlock(&dev->buf_lock);
814
815 mutex_lock(&dev->struct_mutex);
816 entry = &dma->bufs[order];
817 if (entry->buf_count) {
818 mutex_unlock(&dev->struct_mutex);
819 atomic_dec(&dev->buf_alloc);
820 return -ENOMEM; /* May only call once for each order */
821 }
822
823 if (count < 0 || count > 4096) {
824 mutex_unlock(&dev->struct_mutex);
825 atomic_dec(&dev->buf_alloc);
826 return -EINVAL;
827 }
828
829 entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
830 if (!entry->buflist) {
831 mutex_unlock(&dev->struct_mutex);
832 atomic_dec(&dev->buf_alloc);
833 return -ENOMEM;
834 }
835
836 entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
837 if (!entry->seglist) {
838 kfree(entry->buflist);
839 mutex_unlock(&dev->struct_mutex);
840 atomic_dec(&dev->buf_alloc);
841 return -ENOMEM;
842 }
843
844 /* Keep the original pagelist until we know all the allocations
845 * have succeeded
846 */
847 temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
848 sizeof(*dma->pagelist), GFP_KERNEL);
849 if (!temp_pagelist) {
850 kfree(entry->buflist);
851 kfree(entry->seglist);
852 mutex_unlock(&dev->struct_mutex);
853 atomic_dec(&dev->buf_alloc);
854 return -ENOMEM;
855 }
856 memcpy(temp_pagelist,
857 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
858 DRM_DEBUG("pagelist: %d entries\n",
859 dma->page_count + (count << page_order));
860
861 entry->buf_size = size;
862 entry->page_order = page_order;
863 byte_count = 0;
864 page_count = 0;
865
866 while (entry->buf_count < count) {
867
868 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
869
870 if (!dmah) {
871 /* Set count correctly so we free the proper amount. */
872 entry->buf_count = count;
873 entry->seg_count = count;
874 drm_cleanup_buf_error(dev, entry);
875 kfree(temp_pagelist);
876 mutex_unlock(&dev->struct_mutex);
877 atomic_dec(&dev->buf_alloc);
878 return -ENOMEM;
879 }
880 entry->seglist[entry->seg_count++] = dmah;
881 for (i = 0; i < (1 << page_order); i++) {
882 DRM_DEBUG("page %d @ 0x%08lx\n",
883 dma->page_count + page_count,
884 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
885 temp_pagelist[dma->page_count + page_count++]
886 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
887 }
888 for (offset = 0;
889 offset + size <= total && entry->buf_count < count;
890 offset += alignment, ++entry->buf_count) {
891 buf = &entry->buflist[entry->buf_count];
892 buf->idx = dma->buf_count + entry->buf_count;
893 buf->total = alignment;
894 buf->order = order;
895 buf->used = 0;
896 buf->offset = (dma->byte_count + byte_count + offset);
897 buf->address = (void *)(dmah->vaddr + offset);
898 buf->bus_address = dmah->busaddr + offset;
899 buf->next = NULL;
900 buf->waiting = 0;
901 buf->pending = 0;
902 buf->file_priv = NULL;
903
904 buf->dev_priv_size = dev->driver->dev_priv_size;
905 buf->dev_private = kzalloc(buf->dev_priv_size,
906 GFP_KERNEL);
907 if (!buf->dev_private) {
908 /* Set count correctly so we free the proper amount. */
909 entry->buf_count = count;
910 entry->seg_count = count;
911 drm_cleanup_buf_error(dev, entry);
912 kfree(temp_pagelist);
913 mutex_unlock(&dev->struct_mutex);
914 atomic_dec(&dev->buf_alloc);
915 return -ENOMEM;
916 }
917
918 DRM_DEBUG("buffer %d @ %p\n",
919 entry->buf_count, buf->address);
920 }
921 byte_count += PAGE_SIZE << page_order;
922 }
923
924 temp_buflist = krealloc(dma->buflist,
925 (dma->buf_count + entry->buf_count) *
926 sizeof(*dma->buflist), GFP_KERNEL);
927 if (!temp_buflist) {
928 /* Free the entry because it isn't valid */
929 drm_cleanup_buf_error(dev, entry);
930 kfree(temp_pagelist);
931 mutex_unlock(&dev->struct_mutex);
932 atomic_dec(&dev->buf_alloc);
933 return -ENOMEM;
934 }
935 dma->buflist = temp_buflist;
936
937 for (i = 0; i < entry->buf_count; i++) {
938 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
939 }
940
941 /* No allocations failed, so now we can replace the original pagelist
942 * with the new one.
943 */
944 if (dma->page_count) {
945 kfree(dma->pagelist);
946 }
947 dma->pagelist = temp_pagelist;
948
949 dma->buf_count += entry->buf_count;
950 dma->seg_count += entry->seg_count;
951 dma->page_count += entry->seg_count << page_order;
952 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
953
954 mutex_unlock(&dev->struct_mutex);
955
956 request->count = entry->buf_count;
957 request->size = size;
958
959 if (request->flags & _DRM_PCI_BUFFER_RO)
960 dma->flags = _DRM_DMA_USE_PCI_RO;
961
962 atomic_dec(&dev->buf_alloc);
963 return 0;
964
965 }
966 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
967
drm_legacy_addbufs_sg(struct drm_device * dev,struct drm_buf_desc * request)968 static int drm_legacy_addbufs_sg(struct drm_device *dev,
969 struct drm_buf_desc *request)
970 {
971 struct drm_device_dma *dma = dev->dma;
972 struct drm_buf_entry *entry;
973 struct drm_buf *buf;
974 unsigned long offset;
975 unsigned long agp_offset;
976 int count;
977 int order;
978 int size;
979 int alignment;
980 int page_order;
981 int total;
982 int byte_count;
983 int i;
984 struct drm_buf **temp_buflist;
985
986 if (!drm_core_check_feature(dev, DRIVER_SG))
987 return -EINVAL;
988
989 if (!dma)
990 return -EINVAL;
991
992 if (!capable(CAP_SYS_ADMIN))
993 return -EPERM;
994
995 count = request->count;
996 order = order_base_2(request->size);
997 size = 1 << order;
998
999 alignment = (request->flags & _DRM_PAGE_ALIGN)
1000 ? PAGE_ALIGN(size) : size;
1001 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1002 total = PAGE_SIZE << page_order;
1003
1004 byte_count = 0;
1005 agp_offset = request->agp_start;
1006
1007 DRM_DEBUG("count: %d\n", count);
1008 DRM_DEBUG("order: %d\n", order);
1009 DRM_DEBUG("size: %d\n", size);
1010 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1011 DRM_DEBUG("alignment: %d\n", alignment);
1012 DRM_DEBUG("page_order: %d\n", page_order);
1013 DRM_DEBUG("total: %d\n", total);
1014
1015 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1016 return -EINVAL;
1017
1018 spin_lock(&dev->buf_lock);
1019 if (dev->buf_use) {
1020 spin_unlock(&dev->buf_lock);
1021 return -EBUSY;
1022 }
1023 atomic_inc(&dev->buf_alloc);
1024 spin_unlock(&dev->buf_lock);
1025
1026 mutex_lock(&dev->struct_mutex);
1027 entry = &dma->bufs[order];
1028 if (entry->buf_count) {
1029 mutex_unlock(&dev->struct_mutex);
1030 atomic_dec(&dev->buf_alloc);
1031 return -ENOMEM; /* May only call once for each order */
1032 }
1033
1034 if (count < 0 || count > 4096) {
1035 mutex_unlock(&dev->struct_mutex);
1036 atomic_dec(&dev->buf_alloc);
1037 return -EINVAL;
1038 }
1039
1040 entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1041 GFP_KERNEL);
1042 if (!entry->buflist) {
1043 mutex_unlock(&dev->struct_mutex);
1044 atomic_dec(&dev->buf_alloc);
1045 return -ENOMEM;
1046 }
1047
1048 entry->buf_size = size;
1049 entry->page_order = page_order;
1050
1051 offset = 0;
1052
1053 while (entry->buf_count < count) {
1054 buf = &entry->buflist[entry->buf_count];
1055 buf->idx = dma->buf_count + entry->buf_count;
1056 buf->total = alignment;
1057 buf->order = order;
1058 buf->used = 0;
1059
1060 buf->offset = (dma->byte_count + offset);
1061 buf->bus_address = agp_offset + offset;
1062 buf->address = (void *)(agp_offset + offset
1063 + (unsigned long)dev->sg->virtual);
1064 buf->next = NULL;
1065 buf->waiting = 0;
1066 buf->pending = 0;
1067 buf->file_priv = NULL;
1068
1069 buf->dev_priv_size = dev->driver->dev_priv_size;
1070 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1071 if (!buf->dev_private) {
1072 /* Set count correctly so we free the proper amount. */
1073 entry->buf_count = count;
1074 drm_cleanup_buf_error(dev, entry);
1075 mutex_unlock(&dev->struct_mutex);
1076 atomic_dec(&dev->buf_alloc);
1077 return -ENOMEM;
1078 }
1079
1080 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1081
1082 offset += alignment;
1083 entry->buf_count++;
1084 byte_count += PAGE_SIZE << page_order;
1085 }
1086
1087 DRM_DEBUG("byte_count: %d\n", byte_count);
1088
1089 temp_buflist = krealloc(dma->buflist,
1090 (dma->buf_count + entry->buf_count) *
1091 sizeof(*dma->buflist), GFP_KERNEL);
1092 if (!temp_buflist) {
1093 /* Free the entry because it isn't valid */
1094 drm_cleanup_buf_error(dev, entry);
1095 mutex_unlock(&dev->struct_mutex);
1096 atomic_dec(&dev->buf_alloc);
1097 return -ENOMEM;
1098 }
1099 dma->buflist = temp_buflist;
1100
1101 for (i = 0; i < entry->buf_count; i++) {
1102 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1103 }
1104
1105 dma->buf_count += entry->buf_count;
1106 dma->seg_count += entry->seg_count;
1107 dma->page_count += byte_count >> PAGE_SHIFT;
1108 dma->byte_count += byte_count;
1109
1110 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1111 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1112
1113 mutex_unlock(&dev->struct_mutex);
1114
1115 request->count = entry->buf_count;
1116 request->size = size;
1117
1118 dma->flags = _DRM_DMA_USE_SG;
1119
1120 atomic_dec(&dev->buf_alloc);
1121 return 0;
1122 }
1123
1124 /**
1125 * Add buffers for DMA transfers (ioctl).
1126 *
1127 * \param inode device inode.
1128 * \param file_priv DRM file private.
1129 * \param cmd command.
1130 * \param arg pointer to a struct drm_buf_desc request.
1131 * \return zero on success or a negative number on failure.
1132 *
1133 * According with the memory type specified in drm_buf_desc::flags and the
1134 * build options, it dispatches the call either to addbufs_agp(),
1135 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1136 * PCI memory respectively.
1137 */
drm_legacy_addbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1138 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1139 struct drm_file *file_priv)
1140 {
1141 struct drm_buf_desc *request = data;
1142 int ret;
1143
1144 if (drm_core_check_feature(dev, DRIVER_MODESET))
1145 return -EINVAL;
1146
1147 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1148 return -EINVAL;
1149
1150 #if IS_ENABLED(CONFIG_AGP)
1151 if (request->flags & _DRM_AGP_BUFFER)
1152 ret = drm_legacy_addbufs_agp(dev, request);
1153 else
1154 #endif
1155 if (request->flags & _DRM_SG_BUFFER)
1156 ret = drm_legacy_addbufs_sg(dev, request);
1157 else if (request->flags & _DRM_FB_BUFFER)
1158 ret = -EINVAL;
1159 else
1160 ret = drm_legacy_addbufs_pci(dev, request);
1161
1162 return ret;
1163 }
1164
1165 /**
1166 * Get information about the buffer mappings.
1167 *
1168 * This was originally mean for debugging purposes, or by a sophisticated
1169 * client library to determine how best to use the available buffers (e.g.,
1170 * large buffers can be used for image transfer).
1171 *
1172 * \param inode device inode.
1173 * \param file_priv DRM file private.
1174 * \param cmd command.
1175 * \param arg pointer to a drm_buf_info structure.
1176 * \return zero on success or a negative number on failure.
1177 *
1178 * Increments drm_device::buf_use while holding the drm_device::buf_lock
1179 * lock, preventing of allocating more buffers after this call. Information
1180 * about each requested buffer is then copied into user space.
1181 */
drm_legacy_infobufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1182 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1183 struct drm_file *file_priv)
1184 {
1185 struct drm_device_dma *dma = dev->dma;
1186 struct drm_buf_info *request = data;
1187 int i;
1188 int count;
1189
1190 if (drm_core_check_feature(dev, DRIVER_MODESET))
1191 return -EINVAL;
1192
1193 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1194 return -EINVAL;
1195
1196 if (!dma)
1197 return -EINVAL;
1198
1199 spin_lock(&dev->buf_lock);
1200 if (atomic_read(&dev->buf_alloc)) {
1201 spin_unlock(&dev->buf_lock);
1202 return -EBUSY;
1203 }
1204 ++dev->buf_use; /* Can't allocate more after this call */
1205 spin_unlock(&dev->buf_lock);
1206
1207 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1208 if (dma->bufs[i].buf_count)
1209 ++count;
1210 }
1211
1212 DRM_DEBUG("count = %d\n", count);
1213
1214 if (request->count >= count) {
1215 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1216 if (dma->bufs[i].buf_count) {
1217 struct drm_buf_desc __user *to =
1218 &request->list[count];
1219 struct drm_buf_entry *from = &dma->bufs[i];
1220 if (copy_to_user(&to->count,
1221 &from->buf_count,
1222 sizeof(from->buf_count)) ||
1223 copy_to_user(&to->size,
1224 &from->buf_size,
1225 sizeof(from->buf_size)) ||
1226 copy_to_user(&to->low_mark,
1227 &from->low_mark,
1228 sizeof(from->low_mark)) ||
1229 copy_to_user(&to->high_mark,
1230 &from->high_mark,
1231 sizeof(from->high_mark)))
1232 return -EFAULT;
1233
1234 DRM_DEBUG("%d %d %d %d %d\n",
1235 i,
1236 dma->bufs[i].buf_count,
1237 dma->bufs[i].buf_size,
1238 dma->bufs[i].low_mark,
1239 dma->bufs[i].high_mark);
1240 ++count;
1241 }
1242 }
1243 }
1244 request->count = count;
1245
1246 return 0;
1247 }
1248
1249 /**
1250 * Specifies a low and high water mark for buffer allocation
1251 *
1252 * \param inode device inode.
1253 * \param file_priv DRM file private.
1254 * \param cmd command.
1255 * \param arg a pointer to a drm_buf_desc structure.
1256 * \return zero on success or a negative number on failure.
1257 *
1258 * Verifies that the size order is bounded between the admissible orders and
1259 * updates the respective drm_device_dma::bufs entry low and high water mark.
1260 *
1261 * \note This ioctl is deprecated and mostly never used.
1262 */
drm_legacy_markbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1263 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1264 struct drm_file *file_priv)
1265 {
1266 struct drm_device_dma *dma = dev->dma;
1267 struct drm_buf_desc *request = data;
1268 int order;
1269 struct drm_buf_entry *entry;
1270
1271 if (drm_core_check_feature(dev, DRIVER_MODESET))
1272 return -EINVAL;
1273
1274 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1275 return -EINVAL;
1276
1277 if (!dma)
1278 return -EINVAL;
1279
1280 DRM_DEBUG("%d, %d, %d\n",
1281 request->size, request->low_mark, request->high_mark);
1282 order = order_base_2(request->size);
1283 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1284 return -EINVAL;
1285 entry = &dma->bufs[order];
1286
1287 if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1288 return -EINVAL;
1289 if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1290 return -EINVAL;
1291
1292 entry->low_mark = request->low_mark;
1293 entry->high_mark = request->high_mark;
1294
1295 return 0;
1296 }
1297
1298 /**
1299 * Unreserve the buffers in list, previously reserved using drmDMA.
1300 *
1301 * \param inode device inode.
1302 * \param file_priv DRM file private.
1303 * \param cmd command.
1304 * \param arg pointer to a drm_buf_free structure.
1305 * \return zero on success or a negative number on failure.
1306 *
1307 * Calls free_buffer() for each used buffer.
1308 * This function is primarily used for debugging.
1309 */
drm_legacy_freebufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1310 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1311 struct drm_file *file_priv)
1312 {
1313 struct drm_device_dma *dma = dev->dma;
1314 struct drm_buf_free *request = data;
1315 int i;
1316 int idx;
1317 struct drm_buf *buf;
1318
1319 if (drm_core_check_feature(dev, DRIVER_MODESET))
1320 return -EINVAL;
1321
1322 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1323 return -EINVAL;
1324
1325 if (!dma)
1326 return -EINVAL;
1327
1328 DRM_DEBUG("%d\n", request->count);
1329 for (i = 0; i < request->count; i++) {
1330 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1331 return -EFAULT;
1332 if (idx < 0 || idx >= dma->buf_count) {
1333 DRM_ERROR("Index %d (of %d max)\n",
1334 idx, dma->buf_count - 1);
1335 return -EINVAL;
1336 }
1337 idx = array_index_nospec(idx, dma->buf_count);
1338 buf = dma->buflist[idx];
1339 if (buf->file_priv != file_priv) {
1340 DRM_ERROR("Process %d freeing buffer not owned\n",
1341 task_pid_nr(current));
1342 return -EINVAL;
1343 }
1344 drm_legacy_free_buffer(dev, buf);
1345 }
1346
1347 return 0;
1348 }
1349
1350 /**
1351 * Maps all of the DMA buffers into client-virtual space (ioctl).
1352 *
1353 * \param inode device inode.
1354 * \param file_priv DRM file private.
1355 * \param cmd command.
1356 * \param arg pointer to a drm_buf_map structure.
1357 * \return zero on success or a negative number on failure.
1358 *
1359 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1360 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1361 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1362 * drm_mmap_dma().
1363 */
drm_legacy_mapbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1364 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1365 struct drm_file *file_priv)
1366 {
1367 struct drm_device_dma *dma = dev->dma;
1368 int retcode = 0;
1369 const int zero = 0;
1370 unsigned long virtual;
1371 unsigned long address;
1372 struct drm_buf_map *request = data;
1373 int i;
1374
1375 if (drm_core_check_feature(dev, DRIVER_MODESET))
1376 return -EINVAL;
1377
1378 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1379 return -EINVAL;
1380
1381 if (!dma)
1382 return -EINVAL;
1383
1384 spin_lock(&dev->buf_lock);
1385 if (atomic_read(&dev->buf_alloc)) {
1386 spin_unlock(&dev->buf_lock);
1387 return -EBUSY;
1388 }
1389 dev->buf_use++; /* Can't allocate more after this call */
1390 spin_unlock(&dev->buf_lock);
1391
1392 if (request->count >= dma->buf_count) {
1393 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1394 || (drm_core_check_feature(dev, DRIVER_SG)
1395 && (dma->flags & _DRM_DMA_USE_SG))) {
1396 struct drm_local_map *map = dev->agp_buffer_map;
1397 unsigned long token = dev->agp_buffer_token;
1398
1399 if (!map) {
1400 retcode = -EINVAL;
1401 goto done;
1402 }
1403 virtual = vm_mmap(file_priv->filp, 0, map->size,
1404 PROT_READ | PROT_WRITE,
1405 MAP_SHARED,
1406 token);
1407 } else {
1408 virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1409 PROT_READ | PROT_WRITE,
1410 MAP_SHARED, 0);
1411 }
1412 if (virtual > -1024UL) {
1413 /* Real error */
1414 retcode = (signed long)virtual;
1415 goto done;
1416 }
1417 request->virtual = (void __user *)virtual;
1418
1419 for (i = 0; i < dma->buf_count; i++) {
1420 if (copy_to_user(&request->list[i].idx,
1421 &dma->buflist[i]->idx,
1422 sizeof(request->list[0].idx))) {
1423 retcode = -EFAULT;
1424 goto done;
1425 }
1426 if (copy_to_user(&request->list[i].total,
1427 &dma->buflist[i]->total,
1428 sizeof(request->list[0].total))) {
1429 retcode = -EFAULT;
1430 goto done;
1431 }
1432 if (copy_to_user(&request->list[i].used,
1433 &zero, sizeof(zero))) {
1434 retcode = -EFAULT;
1435 goto done;
1436 }
1437 address = virtual + dma->buflist[i]->offset; /* *** */
1438 if (copy_to_user(&request->list[i].address,
1439 &address, sizeof(address))) {
1440 retcode = -EFAULT;
1441 goto done;
1442 }
1443 }
1444 }
1445 done:
1446 request->count = dma->buf_count;
1447 DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1448
1449 return retcode;
1450 }
1451
drm_legacy_dma_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)1452 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1453 struct drm_file *file_priv)
1454 {
1455 if (drm_core_check_feature(dev, DRIVER_MODESET))
1456 return -EINVAL;
1457
1458 if (dev->driver->dma_ioctl)
1459 return dev->driver->dma_ioctl(dev, data, file_priv);
1460 else
1461 return -EINVAL;
1462 }
1463
drm_legacy_getsarea(struct drm_device * dev)1464 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1465 {
1466 struct drm_map_list *entry;
1467
1468 list_for_each_entry(entry, &dev->maplist, head) {
1469 if (entry->map && entry->map->type == _DRM_SHM &&
1470 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1471 return entry->map;
1472 }
1473 }
1474 return NULL;
1475 }
1476 EXPORT_SYMBOL(drm_legacy_getsarea);
1477