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[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 EXPORT_SYMBOL(drm_rmmap_locked);
390
391 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
392 {
393 int ret;
394
395 mutex_lock(&dev->struct_mutex);
396 ret = drm_rmmap_locked(dev, map);
397 mutex_unlock(&dev->struct_mutex);
398
399 return ret;
400 }
401 EXPORT_SYMBOL(drm_rmmap);
402
403 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
404 * the last close of the device, and this is necessary for cleanup when things
405 * exit uncleanly. Therefore, having userland manually remove mappings seems
406 * like a pointless exercise since they're going away anyway.
407 *
408 * One use case might be after addmap is allowed for normal users for SHM and
409 * gets used by drivers that the server doesn't need to care about. This seems
410 * unlikely.
411 */
412 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
413 unsigned int cmd, unsigned long arg)
414 {
415 drm_file_t *priv = filp->private_data;
416 drm_device_t *dev = priv->head->dev;
417 drm_map_t request;
418 drm_local_map_t *map = NULL;
419 struct list_head *list;
420 int ret;
421
422 if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
423 return -EFAULT;
424 }
425
426 mutex_lock(&dev->struct_mutex);
427 list_for_each(list, &dev->maplist->head) {
428 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
429
430 if (r_list->map &&
431 r_list->user_token == (unsigned long)request.handle &&
432 r_list->map->flags & _DRM_REMOVABLE) {
433 map = r_list->map;
434 break;
435 }
436 }
437
438 /* List has wrapped around to the head pointer, or its empty we didn't
439 * find anything.
440 */
441 if (list == (&dev->maplist->head)) {
442 mutex_unlock(&dev->struct_mutex);
443 return -EINVAL;
444 }
445
446 if (!map)
447 return -EINVAL;
448
449 /* Register and framebuffer maps are permanent */
450 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
451 mutex_unlock(&dev->struct_mutex);
452 return 0;
453 }
454
455 ret = drm_rmmap_locked(dev, map);
456
457 mutex_unlock(&dev->struct_mutex);
458
459 return ret;
460 }
461
462 /**
463 * Cleanup after an error on one of the addbufs() functions.
464 *
465 * \param dev DRM device.
466 * \param entry buffer entry where the error occurred.
467 *
468 * Frees any pages and buffers associated with the given entry.
469 */
470 static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
471 {
472 int i;
473
474 if (entry->seg_count) {
475 for (i = 0; i < entry->seg_count; i++) {
476 if (entry->seglist[i]) {
477 drm_free_pages(entry->seglist[i],
478 entry->page_order, DRM_MEM_DMA);
479 }
480 }
481 drm_free(entry->seglist,
482 entry->seg_count *
483 sizeof(*entry->seglist), DRM_MEM_SEGS);
484
485 entry->seg_count = 0;
486 }
487
488 if (entry->buf_count) {
489 for (i = 0; i < entry->buf_count; i++) {
490 if (entry->buflist[i].dev_private) {
491 drm_free(entry->buflist[i].dev_private,
492 entry->buflist[i].dev_priv_size,
493 DRM_MEM_BUFS);
494 }
495 }
496 drm_free(entry->buflist,
497 entry->buf_count *
498 sizeof(*entry->buflist), DRM_MEM_BUFS);
499
500 entry->buf_count = 0;
501 }
502 }
503
504 #if __OS_HAS_AGP
505 /**
506 * Add AGP buffers for DMA transfers.
507 *
508 * \param dev drm_device_t to which the buffers are to be added.
509 * \param request pointer to a drm_buf_desc_t describing the request.
510 * \return zero on success or a negative number on failure.
511 *
512 * After some sanity checks creates a drm_buf structure for each buffer and
513 * reallocates the buffer list of the same size order to accommodate the new
514 * buffers.
515 */
516 int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
517 {
518 drm_device_dma_t *dma = dev->dma;
519 drm_buf_entry_t *entry;
520 drm_buf_t *buf;
521 unsigned long offset;
522 unsigned long agp_offset;
523 int count;
524 int order;
525 int size;
526 int alignment;
527 int page_order;
528 int total;
529 int byte_count;
530 int i;
531 drm_buf_t **temp_buflist;
532
533 if (!dma)
534 return -EINVAL;
535
536 count = request->count;
537 order = drm_order(request->size);
538 size = 1 << order;
539
540 alignment = (request->flags & _DRM_PAGE_ALIGN)
541 ? PAGE_ALIGN(size) : size;
542 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
543 total = PAGE_SIZE << page_order;
544
545 byte_count = 0;
546 agp_offset = dev->agp->base + request->agp_start;
547
548 DRM_DEBUG("count: %d\n", count);
549 DRM_DEBUG("order: %d\n", order);
550 DRM_DEBUG("size: %d\n", size);
551 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
552 DRM_DEBUG("alignment: %d\n", alignment);
553 DRM_DEBUG("page_order: %d\n", page_order);
554 DRM_DEBUG("total: %d\n", total);
555
556 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
557 return -EINVAL;
558 if (dev->queue_count)
559 return -EBUSY; /* Not while in use */
560
561 spin_lock(&dev->count_lock);
562 if (dev->buf_use) {
563 spin_unlock(&dev->count_lock);
564 return -EBUSY;
565 }
566 atomic_inc(&dev->buf_alloc);
567 spin_unlock(&dev->count_lock);
568
569 mutex_lock(&dev->struct_mutex);
570 entry = &dma->bufs[order];
571 if (entry->buf_count) {
572 mutex_unlock(&dev->struct_mutex);
573 atomic_dec(&dev->buf_alloc);
574 return -ENOMEM; /* May only call once for each order */
575 }
576
577 if (count < 0 || count > 4096) {
578 mutex_unlock(&dev->struct_mutex);
579 atomic_dec(&dev->buf_alloc);
580 return -EINVAL;
581 }
582
583 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
584 DRM_MEM_BUFS);
585 if (!entry->buflist) {
586 mutex_unlock(&dev->struct_mutex);
587 atomic_dec(&dev->buf_alloc);
588 return -ENOMEM;
589 }
590 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
591
592 entry->buf_size = size;
593 entry->page_order = page_order;
594
595 offset = 0;
596
597 while (entry->buf_count < count) {
598 buf = &entry->buflist[entry->buf_count];
599 buf->idx = dma->buf_count + entry->buf_count;
600 buf->total = alignment;
601 buf->order = order;
602 buf->used = 0;
603
604 buf->offset = (dma->byte_count + offset);
605 buf->bus_address = agp_offset + offset;
606 buf->address = (void *)(agp_offset + offset);
607 buf->next = NULL;
608 buf->waiting = 0;
609 buf->pending = 0;
610 init_waitqueue_head(&buf->dma_wait);
611 buf->filp = NULL;
612
613 buf->dev_priv_size = dev->driver->dev_priv_size;
614 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
615 if (!buf->dev_private) {
616 /* Set count correctly so we free the proper amount. */
617 entry->buf_count = count;
618 drm_cleanup_buf_error(dev, entry);
619 mutex_unlock(&dev->struct_mutex);
620 atomic_dec(&dev->buf_alloc);
621 return -ENOMEM;
622 }
623 memset(buf->dev_private, 0, buf->dev_priv_size);
624
625 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
626
627 offset += alignment;
628 entry->buf_count++;
629 byte_count += PAGE_SIZE << page_order;
630 }
631
632 DRM_DEBUG("byte_count: %d\n", byte_count);
633
634 temp_buflist = drm_realloc(dma->buflist,
635 dma->buf_count * sizeof(*dma->buflist),
636 (dma->buf_count + entry->buf_count)
637 * sizeof(*dma->buflist), DRM_MEM_BUFS);
638 if (!temp_buflist) {
639 /* Free the entry because it isn't valid */
640 drm_cleanup_buf_error(dev, entry);
641 mutex_unlock(&dev->struct_mutex);
642 atomic_dec(&dev->buf_alloc);
643 return -ENOMEM;
644 }
645 dma->buflist = temp_buflist;
646
647 for (i = 0; i < entry->buf_count; i++) {
648 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
649 }
650
651 dma->buf_count += entry->buf_count;
652 dma->seg_count += entry->seg_count;
653 dma->page_count += byte_count >> PAGE_SHIFT;
654 dma->byte_count += byte_count;
655
656 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
657 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
658
659 mutex_unlock(&dev->struct_mutex);
660
661 request->count = entry->buf_count;
662 request->size = size;
663
664 dma->flags = _DRM_DMA_USE_AGP;
665
666 atomic_dec(&dev->buf_alloc);
667 return 0;
668 }
669 EXPORT_SYMBOL(drm_addbufs_agp);
670 #endif /* __OS_HAS_AGP */
671
672 int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
673 {
674 drm_device_dma_t *dma = dev->dma;
675 int count;
676 int order;
677 int size;
678 int total;
679 int page_order;
680 drm_buf_entry_t *entry;
681 unsigned long page;
682 drm_buf_t *buf;
683 int alignment;
684 unsigned long offset;
685 int i;
686 int byte_count;
687 int page_count;
688 unsigned long *temp_pagelist;
689 drm_buf_t **temp_buflist;
690
691 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
692 return -EINVAL;
693
694 if (!dma)
695 return -EINVAL;
696
697 if (!capable(CAP_SYS_ADMIN))
698 return -EPERM;
699
700 count = request->count;
701 order = drm_order(request->size);
702 size = 1 << order;
703
704 DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
705 request->count, request->size, size, order, dev->queue_count);
706
707 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
708 return -EINVAL;
709 if (dev->queue_count)
710 return -EBUSY; /* Not while in use */
711
712 alignment = (request->flags & _DRM_PAGE_ALIGN)
713 ? PAGE_ALIGN(size) : size;
714 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
715 total = PAGE_SIZE << page_order;
716
717 spin_lock(&dev->count_lock);
718 if (dev->buf_use) {
719 spin_unlock(&dev->count_lock);
720 return -EBUSY;
721 }
722 atomic_inc(&dev->buf_alloc);
723 spin_unlock(&dev->count_lock);
724
725 mutex_lock(&dev->struct_mutex);
726 entry = &dma->bufs[order];
727 if (entry->buf_count) {
728 mutex_unlock(&dev->struct_mutex);
729 atomic_dec(&dev->buf_alloc);
730 return -ENOMEM; /* May only call once for each order */
731 }
732
733 if (count < 0 || count > 4096) {
734 mutex_unlock(&dev->struct_mutex);
735 atomic_dec(&dev->buf_alloc);
736 return -EINVAL;
737 }
738
739 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
740 DRM_MEM_BUFS);
741 if (!entry->buflist) {
742 mutex_unlock(&dev->struct_mutex);
743 atomic_dec(&dev->buf_alloc);
744 return -ENOMEM;
745 }
746 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
747
748 entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
749 DRM_MEM_SEGS);
750 if (!entry->seglist) {
751 drm_free(entry->buflist,
752 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
753 mutex_unlock(&dev->struct_mutex);
754 atomic_dec(&dev->buf_alloc);
755 return -ENOMEM;
756 }
757 memset(entry->seglist, 0, count * sizeof(*entry->seglist));
758
759 /* Keep the original pagelist until we know all the allocations
760 * have succeeded
761 */
762 temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
763 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
764 if (!temp_pagelist) {
765 drm_free(entry->buflist,
766 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
767 drm_free(entry->seglist,
768 count * sizeof(*entry->seglist), DRM_MEM_SEGS);
769 mutex_unlock(&dev->struct_mutex);
770 atomic_dec(&dev->buf_alloc);
771 return -ENOMEM;
772 }
773 memcpy(temp_pagelist,
774 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
775 DRM_DEBUG("pagelist: %d entries\n",
776 dma->page_count + (count << page_order));
777
778 entry->buf_size = size;
779 entry->page_order = page_order;
780 byte_count = 0;
781 page_count = 0;
782
783 while (entry->buf_count < count) {
784 page = drm_alloc_pages(page_order, DRM_MEM_DMA);
785 if (!page) {
786 /* Set count correctly so we free the proper amount. */
787 entry->buf_count = count;
788 entry->seg_count = count;
789 drm_cleanup_buf_error(dev, entry);
790 drm_free(temp_pagelist,
791 (dma->page_count + (count << page_order))
792 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
793 mutex_unlock(&dev->struct_mutex);
794 atomic_dec(&dev->buf_alloc);
795 return -ENOMEM;
796 }
797 entry->seglist[entry->seg_count++] = page;
798 for (i = 0; i < (1 << page_order); i++) {
799 DRM_DEBUG("page %d @ 0x%08lx\n",
800 dma->page_count + page_count,
801 page + PAGE_SIZE * i);
802 temp_pagelist[dma->page_count + page_count++]
803 = page + PAGE_SIZE * i;
804 }
805 for (offset = 0;
806 offset + size <= total && entry->buf_count < count;
807 offset += alignment, ++entry->buf_count) {
808 buf = &entry->buflist[entry->buf_count];
809 buf->idx = dma->buf_count + entry->buf_count;
810 buf->total = alignment;
811 buf->order = order;
812 buf->used = 0;
813 buf->offset = (dma->byte_count + byte_count + offset);
814 buf->address = (void *)(page + 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 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 EXPORT_SYMBOL(drm_addbufs_fb);
1214
1215
1216 /**
1217 * Add buffers for DMA transfers (ioctl).
1218 *
1219 * \param inode device inode.
1220 * \param filp file pointer.
1221 * \param cmd command.
1222 * \param arg pointer to a drm_buf_desc_t request.
1223 * \return zero on success or a negative number on failure.
1224 *
1225 * According with the memory type specified in drm_buf_desc::flags and the
1226 * build options, it dispatches the call either to addbufs_agp(),
1227 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1228 * PCI memory respectively.
1229 */
1230 int drm_addbufs(struct inode *inode, struct file *filp,
1231 unsigned int cmd, unsigned long arg)
1232 {
1233 drm_buf_desc_t request;
1234 drm_file_t *priv = filp->private_data;
1235 drm_device_t *dev = priv->head->dev;
1236 int ret;
1237
1238 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1239 return -EINVAL;
1240
1241 if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
1242 sizeof(request)))
1243 return -EFAULT;
1244
1245 #if __OS_HAS_AGP
1246 if (request.flags & _DRM_AGP_BUFFER)
1247 ret = drm_addbufs_agp(dev, &request);
1248 else
1249 #endif
1250 if (request.flags & _DRM_SG_BUFFER)
1251 ret = drm_addbufs_sg(dev, &request);
1252 else if (request.flags & _DRM_FB_BUFFER)
1253 ret = drm_addbufs_fb(dev, &request);
1254 else
1255 ret = drm_addbufs_pci(dev, &request);
1256
1257 if (ret == 0) {
1258 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1259 ret = -EFAULT;
1260 }
1261 }
1262 return ret;
1263 }
1264
1265 /**
1266 * Get information about the buffer mappings.
1267 *
1268 * This was originally mean for debugging purposes, or by a sophisticated
1269 * client library to determine how best to use the available buffers (e.g.,
1270 * large buffers can be used for image transfer).
1271 *
1272 * \param inode device inode.
1273 * \param filp file pointer.
1274 * \param cmd command.
1275 * \param arg pointer to a drm_buf_info structure.
1276 * \return zero on success or a negative number on failure.
1277 *
1278 * Increments drm_device::buf_use while holding the drm_device::count_lock
1279 * lock, preventing of allocating more buffers after this call. Information
1280 * about each requested buffer is then copied into user space.
1281 */
1282 int drm_infobufs(struct inode *inode, struct file *filp,
1283 unsigned int cmd, unsigned long arg)
1284 {
1285 drm_file_t *priv = filp->private_data;
1286 drm_device_t *dev = priv->head->dev;
1287 drm_device_dma_t *dma = dev->dma;
1288 drm_buf_info_t request;
1289 drm_buf_info_t __user *argp = (void __user *)arg;
1290 int i;
1291 int count;
1292
1293 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1294 return -EINVAL;
1295
1296 if (!dma)
1297 return -EINVAL;
1298
1299 spin_lock(&dev->count_lock);
1300 if (atomic_read(&dev->buf_alloc)) {
1301 spin_unlock(&dev->count_lock);
1302 return -EBUSY;
1303 }
1304 ++dev->buf_use; /* Can't allocate more after this call */
1305 spin_unlock(&dev->count_lock);
1306
1307 if (copy_from_user(&request, argp, sizeof(request)))
1308 return -EFAULT;
1309
1310 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1311 if (dma->bufs[i].buf_count)
1312 ++count;
1313 }
1314
1315 DRM_DEBUG("count = %d\n", count);
1316
1317 if (request.count >= count) {
1318 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1319 if (dma->bufs[i].buf_count) {
1320 drm_buf_desc_t __user *to =
1321 &request.list[count];
1322 drm_buf_entry_t *from = &dma->bufs[i];
1323 drm_freelist_t *list = &dma->bufs[i].freelist;
1324 if (copy_to_user(&to->count,
1325 &from->buf_count,
1326 sizeof(from->buf_count)) ||
1327 copy_to_user(&to->size,
1328 &from->buf_size,
1329 sizeof(from->buf_size)) ||
1330 copy_to_user(&to->low_mark,
1331 &list->low_mark,
1332 sizeof(list->low_mark)) ||
1333 copy_to_user(&to->high_mark,
1334 &list->high_mark,
1335 sizeof(list->high_mark)))
1336 return -EFAULT;
1337
1338 DRM_DEBUG("%d %d %d %d %d\n",
1339 i,
1340 dma->bufs[i].buf_count,
1341 dma->bufs[i].buf_size,
1342 dma->bufs[i].freelist.low_mark,
1343 dma->bufs[i].freelist.high_mark);
1344 ++count;
1345 }
1346 }
1347 }
1348 request.count = count;
1349
1350 if (copy_to_user(argp, &request, sizeof(request)))
1351 return -EFAULT;
1352
1353 return 0;
1354 }
1355
1356 /**
1357 * Specifies a low and high water mark for buffer allocation
1358 *
1359 * \param inode device inode.
1360 * \param filp file pointer.
1361 * \param cmd command.
1362 * \param arg a pointer to a drm_buf_desc structure.
1363 * \return zero on success or a negative number on failure.
1364 *
1365 * Verifies that the size order is bounded between the admissible orders and
1366 * updates the respective drm_device_dma::bufs entry low and high water mark.
1367 *
1368 * \note This ioctl is deprecated and mostly never used.
1369 */
1370 int drm_markbufs(struct inode *inode, struct file *filp,
1371 unsigned int cmd, unsigned long arg)
1372 {
1373 drm_file_t *priv = filp->private_data;
1374 drm_device_t *dev = priv->head->dev;
1375 drm_device_dma_t *dma = dev->dma;
1376 drm_buf_desc_t request;
1377 int order;
1378 drm_buf_entry_t *entry;
1379
1380 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1381 return -EINVAL;
1382
1383 if (!dma)
1384 return -EINVAL;
1385
1386 if (copy_from_user(&request,
1387 (drm_buf_desc_t __user *) arg, sizeof(request)))
1388 return -EFAULT;
1389
1390 DRM_DEBUG("%d, %d, %d\n",
1391 request.size, request.low_mark, request.high_mark);
1392 order = drm_order(request.size);
1393 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1394 return -EINVAL;
1395 entry = &dma->bufs[order];
1396
1397 if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1398 return -EINVAL;
1399 if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1400 return -EINVAL;
1401
1402 entry->freelist.low_mark = request.low_mark;
1403 entry->freelist.high_mark = request.high_mark;
1404
1405 return 0;
1406 }
1407
1408 /**
1409 * Unreserve the buffers in list, previously reserved using drmDMA.
1410 *
1411 * \param inode device inode.
1412 * \param filp file pointer.
1413 * \param cmd command.
1414 * \param arg pointer to a drm_buf_free structure.
1415 * \return zero on success or a negative number on failure.
1416 *
1417 * Calls free_buffer() for each used buffer.
1418 * This function is primarily used for debugging.
1419 */
1420 int drm_freebufs(struct inode *inode, struct file *filp,
1421 unsigned int cmd, unsigned long arg)
1422 {
1423 drm_file_t *priv = filp->private_data;
1424 drm_device_t *dev = priv->head->dev;
1425 drm_device_dma_t *dma = dev->dma;
1426 drm_buf_free_t request;
1427 int i;
1428 int idx;
1429 drm_buf_t *buf;
1430
1431 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1432 return -EINVAL;
1433
1434 if (!dma)
1435 return -EINVAL;
1436
1437 if (copy_from_user(&request,
1438 (drm_buf_free_t __user *) arg, sizeof(request)))
1439 return -EFAULT;
1440
1441 DRM_DEBUG("%d\n", request.count);
1442 for (i = 0; i < request.count; i++) {
1443 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1444 return -EFAULT;
1445 if (idx < 0 || idx >= dma->buf_count) {
1446 DRM_ERROR("Index %d (of %d max)\n",
1447 idx, dma->buf_count - 1);
1448 return -EINVAL;
1449 }
1450 buf = dma->buflist[idx];
1451 if (buf->filp != filp) {
1452 DRM_ERROR("Process %d freeing buffer not owned\n",
1453 current->pid);
1454 return -EINVAL;
1455 }
1456 drm_free_buffer(dev, buf);
1457 }
1458
1459 return 0;
1460 }
1461
1462 /**
1463 * Maps all of the DMA buffers into client-virtual space (ioctl).
1464 *
1465 * \param inode device inode.
1466 * \param filp file pointer.
1467 * \param cmd command.
1468 * \param arg pointer to a drm_buf_map structure.
1469 * \return zero on success or a negative number on failure.
1470 *
1471 * Maps the AGP or SG buffer region with do_mmap(), and copies information
1472 * about each buffer into user space. The PCI buffers are already mapped on the
1473 * addbufs_pci() call.
1474 */
1475 int drm_mapbufs(struct inode *inode, struct file *filp,
1476 unsigned int cmd, unsigned long arg)
1477 {
1478 drm_file_t *priv = filp->private_data;
1479 drm_device_t *dev = priv->head->dev;
1480 drm_device_dma_t *dma = dev->dma;
1481 drm_buf_map_t __user *argp = (void __user *)arg;
1482 int retcode = 0;
1483 const int zero = 0;
1484 unsigned long virtual;
1485 unsigned long address;
1486 drm_buf_map_t request;
1487 int i;
1488
1489 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1490 return -EINVAL;
1491
1492 if (!dma)
1493 return -EINVAL;
1494
1495 spin_lock(&dev->count_lock);
1496 if (atomic_read(&dev->buf_alloc)) {
1497 spin_unlock(&dev->count_lock);
1498 return -EBUSY;
1499 }
1500 dev->buf_use++; /* Can't allocate more after this call */
1501 spin_unlock(&dev->count_lock);
1502
1503 if (copy_from_user(&request, argp, sizeof(request)))
1504 return -EFAULT;
1505
1506 if (request.count >= dma->buf_count) {
1507 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1508 || (drm_core_check_feature(dev, DRIVER_SG)
1509 && (dma->flags & _DRM_DMA_USE_SG))
1510 || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1511 && (dma->flags & _DRM_DMA_USE_FB))) {
1512 drm_map_t *map = dev->agp_buffer_map;
1513 unsigned long token = dev->agp_buffer_token;
1514
1515 if (!map) {
1516 retcode = -EINVAL;
1517 goto done;
1518 }
1519
1520 down_write(&current->mm->mmap_sem);
1521 virtual = do_mmap(filp, 0, map->size,
1522 PROT_READ | PROT_WRITE,
1523 MAP_SHARED, token);
1524 up_write(&current->mm->mmap_sem);
1525 } else {
1526 down_write(&current->mm->mmap_sem);
1527 virtual = do_mmap(filp, 0, dma->byte_count,
1528 PROT_READ | PROT_WRITE,
1529 MAP_SHARED, 0);
1530 up_write(&current->mm->mmap_sem);
1531 }
1532 if (virtual > -1024UL) {
1533 /* Real error */
1534 retcode = (signed long)virtual;
1535 goto done;
1536 }
1537 request.virtual = (void __user *)virtual;
1538
1539 for (i = 0; i < dma->buf_count; i++) {
1540 if (copy_to_user(&request.list[i].idx,
1541 &dma->buflist[i]->idx,
1542 sizeof(request.list[0].idx))) {
1543 retcode = -EFAULT;
1544 goto done;
1545 }
1546 if (copy_to_user(&request.list[i].total,
1547 &dma->buflist[i]->total,
1548 sizeof(request.list[0].total))) {
1549 retcode = -EFAULT;
1550 goto done;
1551 }
1552 if (copy_to_user(&request.list[i].used,
1553 &zero, sizeof(zero))) {
1554 retcode = -EFAULT;
1555 goto done;
1556 }
1557 address = virtual + dma->buflist[i]->offset; /* *** */
1558 if (copy_to_user(&request.list[i].address,
1559 &address, sizeof(address))) {
1560 retcode = -EFAULT;
1561 goto done;
1562 }
1563 }
1564 }
1565 done:
1566 request.count = dma->buf_count;
1567 DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1568
1569 if (copy_to_user(argp, &request, sizeof(request)))
1570 return -EFAULT;
1571
1572 return retcode;
1573 }
1574
1575 /**
1576 * Compute size order. Returns the exponent of the smaller power of two which
1577 * is greater or equal to given number.
1578 *
1579 * \param size size.
1580 * \return order.
1581 *
1582 * \todo Can be made faster.
1583 */
1584 int drm_order(unsigned long size)
1585 {
1586 int order;
1587 unsigned long tmp;
1588
1589 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1590
1591 if (size & (size - 1))
1592 ++order;
1593
1594 return order;
1595 }
1596 EXPORT_SYMBOL(drm_order);
1597
1598
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