1 | /** |
2 | * \file drm_agpsupport.c |
3 | * DRM support for AGP/GART backend |
4 | * |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
6 | * \author Gareth Hughes <gareth@valinux.com> |
7 | */ |
8 | |
9 | /* |
10 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. |
11 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
12 | * All Rights Reserved. |
13 | * |
14 | * Permission is hereby granted, free of charge, to any person obtaining a |
15 | * copy of this software and associated documentation files (the "Software"), |
16 | * to deal in the Software without restriction, including without limitation |
17 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
18 | * and/or sell copies of the Software, and to permit persons to whom the |
19 | * Software is furnished to do so, subject to the following conditions: |
20 | * |
21 | * The above copyright notice and this permission notice (including the next |
22 | * paragraph) shall be included in all copies or substantial portions of the |
23 | * Software. |
24 | * |
25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
26 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
27 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
28 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
29 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
30 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
31 | * OTHER DEALINGS IN THE SOFTWARE. |
32 | */ |
33 | |
34 | #include <drm/drmP.h> |
35 | #include <linux/errno.h> |
36 | #include <linux/export.h> |
37 | #include <linux/module.h> |
38 | #include <linux/slab.h> |
39 | |
40 | #if __OS_HAS_AGP |
41 | |
42 | #include <asm/agp.h> |
43 | |
44 | /** |
45 | * Get AGP information. |
46 | * |
47 | * \param inode device inode. |
48 | * \param file_priv DRM file private. |
49 | * \param cmd command. |
50 | * \param arg pointer to a (output) drm_agp_info structure. |
51 | * \return zero on success or a negative number on failure. |
52 | * |
53 | * Verifies the AGP device has been initialized and acquired and fills in the |
54 | * drm_agp_info structure with the information in drm_agp_head::agp_info. |
55 | */ |
56 | int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info) |
57 | { |
58 | struct agp_kern_info *kern; |
59 | |
60 | if (!dev->agp || !dev->agp->acquired) |
61 | return -EINVAL; |
62 | |
63 | kern = &dev->agp->agp_info; |
64 | #if __NetBSD__ |
65 | info->agp_version_major = 1; |
66 | info->agp_version_minor = 0; |
67 | info->mode = kern->aki_info.ai_mode; |
68 | info->aperture_base = kern->aki_info.ai_aperture_base; |
69 | info->aperture_size = kern->aki_info.ai_aperture_size; |
70 | info->memory_allowed = kern->aki_info.ai_memory_allowed; |
71 | info->memory_used = kern->aki_info.ai_memory_used; |
72 | info->id_vendor = PCI_VENDOR(kern->aki_info.ai_devid); |
73 | info->id_device = PCI_PRODUCT(kern->aki_info.ai_devid); |
74 | #else |
75 | info->agp_version_major = kern->version.major; |
76 | info->agp_version_minor = kern->version.minor; |
77 | info->mode = kern->mode; |
78 | info->aperture_base = kern->aper_base; |
79 | info->aperture_size = kern->aper_size * 1024 * 1024; |
80 | info->memory_allowed = kern->max_memory << PAGE_SHIFT; |
81 | info->memory_used = kern->current_memory << PAGE_SHIFT; |
82 | info->id_vendor = kern->device->vendor; |
83 | info->id_device = kern->device->device; |
84 | #endif |
85 | |
86 | return 0; |
87 | } |
88 | |
89 | EXPORT_SYMBOL(drm_agp_info); |
90 | |
91 | int drm_agp_info_ioctl(struct drm_device *dev, void *data, |
92 | struct drm_file *file_priv) |
93 | { |
94 | struct drm_agp_info *info = data; |
95 | int err; |
96 | |
97 | err = drm_agp_info(dev, info); |
98 | if (err) |
99 | return err; |
100 | |
101 | return 0; |
102 | } |
103 | |
104 | /** |
105 | * Acquire the AGP device. |
106 | * |
107 | * \param dev DRM device that is to acquire AGP. |
108 | * \return zero on success or a negative number on failure. |
109 | * |
110 | * Verifies the AGP device hasn't been acquired before and calls |
111 | * \c agp_backend_acquire. |
112 | */ |
113 | int drm_agp_acquire(struct drm_device * dev) |
114 | { |
115 | if (!dev->agp) |
116 | return -ENODEV; |
117 | if (dev->agp->acquired) |
118 | return -EBUSY; |
119 | if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev))) |
120 | return -ENODEV; |
121 | dev->agp->acquired = 1; |
122 | return 0; |
123 | } |
124 | |
125 | EXPORT_SYMBOL(drm_agp_acquire); |
126 | |
127 | /** |
128 | * Acquire the AGP device (ioctl). |
129 | * |
130 | * \param inode device inode. |
131 | * \param file_priv DRM file private. |
132 | * \param cmd command. |
133 | * \param arg user argument. |
134 | * \return zero on success or a negative number on failure. |
135 | * |
136 | * Verifies the AGP device hasn't been acquired before and calls |
137 | * \c agp_backend_acquire. |
138 | */ |
139 | int drm_agp_acquire_ioctl(struct drm_device *dev, void *data, |
140 | struct drm_file *file_priv) |
141 | { |
142 | return drm_agp_acquire((struct drm_device *) file_priv->minor->dev); |
143 | } |
144 | |
145 | /** |
146 | * Release the AGP device. |
147 | * |
148 | * \param dev DRM device that is to release AGP. |
149 | * \return zero on success or a negative number on failure. |
150 | * |
151 | * Verifies the AGP device has been acquired and calls \c agp_backend_release. |
152 | */ |
153 | int drm_agp_release(struct drm_device * dev) |
154 | { |
155 | if (!dev->agp || !dev->agp->acquired) |
156 | return -EINVAL; |
157 | agp_backend_release(dev->agp->bridge); |
158 | dev->agp->acquired = 0; |
159 | return 0; |
160 | } |
161 | EXPORT_SYMBOL(drm_agp_release); |
162 | |
163 | int drm_agp_release_ioctl(struct drm_device *dev, void *data, |
164 | struct drm_file *file_priv) |
165 | { |
166 | return drm_agp_release(dev); |
167 | } |
168 | |
169 | /** |
170 | * Enable the AGP bus. |
171 | * |
172 | * \param dev DRM device that has previously acquired AGP. |
173 | * \param mode Requested AGP mode. |
174 | * \return zero on success or a negative number on failure. |
175 | * |
176 | * Verifies the AGP device has been acquired but not enabled, and calls |
177 | * \c agp_enable. |
178 | */ |
179 | int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode) |
180 | { |
181 | if (!dev->agp || !dev->agp->acquired) |
182 | return -EINVAL; |
183 | |
184 | dev->agp->mode = mode.mode; |
185 | agp_enable(dev->agp->bridge, mode.mode); |
186 | dev->agp->enabled = 1; |
187 | return 0; |
188 | } |
189 | |
190 | EXPORT_SYMBOL(drm_agp_enable); |
191 | |
192 | int drm_agp_enable_ioctl(struct drm_device *dev, void *data, |
193 | struct drm_file *file_priv) |
194 | { |
195 | struct drm_agp_mode *mode = data; |
196 | |
197 | return drm_agp_enable(dev, *mode); |
198 | } |
199 | |
200 | /** |
201 | * Allocate AGP memory. |
202 | * |
203 | * \param inode device inode. |
204 | * \param file_priv file private pointer. |
205 | * \param cmd command. |
206 | * \param arg pointer to a drm_agp_buffer structure. |
207 | * \return zero on success or a negative number on failure. |
208 | * |
209 | * Verifies the AGP device is present and has been acquired, allocates the |
210 | * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it. |
211 | */ |
212 | int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request) |
213 | { |
214 | struct drm_agp_mem *entry; |
215 | struct agp_memory *memory; |
216 | unsigned long pages; |
217 | u32 type; |
218 | |
219 | if (!dev->agp || !dev->agp->acquired) |
220 | return -EINVAL; |
221 | if (!(entry = kzalloc(sizeof(*entry), GFP_KERNEL))) |
222 | return -ENOMEM; |
223 | |
224 | pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE; |
225 | type = (u32) request->type; |
226 | if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) { |
227 | kfree(entry); |
228 | return -ENOMEM; |
229 | } |
230 | |
231 | #ifdef __NetBSD__ |
232 | /* I presume the `+ 1' is there to avoid an id of 0 or something. */ |
233 | entry->handle = (unsigned long)memory->am_id + 1; |
234 | #else |
235 | entry->handle = (unsigned long)memory->key + 1; |
236 | #endif |
237 | entry->memory = memory; |
238 | entry->bound = 0; |
239 | entry->pages = pages; |
240 | list_add(&entry->head, &dev->agp->memory); |
241 | |
242 | request->handle = entry->handle; |
243 | #ifdef __NetBSD__ |
244 | { |
245 | struct agp_memory_info info; |
246 | agp_memory_info(dev->agp->bridge, memory, &info); |
247 | request->physical = info.ami_physical; |
248 | } |
249 | #else |
250 | request->physical = memory->physical; |
251 | #endif |
252 | |
253 | return 0; |
254 | } |
255 | EXPORT_SYMBOL(drm_agp_alloc); |
256 | |
257 | |
258 | int drm_agp_alloc_ioctl(struct drm_device *dev, void *data, |
259 | struct drm_file *file_priv) |
260 | { |
261 | struct drm_agp_buffer *request = data; |
262 | |
263 | return drm_agp_alloc(dev, request); |
264 | } |
265 | |
266 | /** |
267 | * Search for the AGP memory entry associated with a handle. |
268 | * |
269 | * \param dev DRM device structure. |
270 | * \param handle AGP memory handle. |
271 | * \return pointer to the drm_agp_mem structure associated with \p handle. |
272 | * |
273 | * Walks through drm_agp_head::memory until finding a matching handle. |
274 | */ |
275 | static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev, |
276 | unsigned long handle) |
277 | { |
278 | struct drm_agp_mem *entry; |
279 | |
280 | list_for_each_entry(entry, &dev->agp->memory, head) { |
281 | if (entry->handle == handle) |
282 | return entry; |
283 | } |
284 | return NULL; |
285 | } |
286 | |
287 | /** |
288 | * Unbind AGP memory from the GATT (ioctl). |
289 | * |
290 | * \param inode device inode. |
291 | * \param file_priv DRM file private. |
292 | * \param cmd command. |
293 | * \param arg pointer to a drm_agp_binding structure. |
294 | * \return zero on success or a negative number on failure. |
295 | * |
296 | * Verifies the AGP device is present and acquired, looks-up the AGP memory |
297 | * entry and passes it to the unbind_agp() function. |
298 | */ |
299 | int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request) |
300 | { |
301 | struct drm_agp_mem *entry; |
302 | int ret; |
303 | |
304 | if (!dev->agp || !dev->agp->acquired) |
305 | return -EINVAL; |
306 | if (!(entry = drm_agp_lookup_entry(dev, request->handle))) |
307 | return -EINVAL; |
308 | if (!entry->bound) |
309 | return -EINVAL; |
310 | #ifdef __NetBSD__ |
311 | ret = drm_unbind_agp(dev->agp->bridge, entry->memory); |
312 | #else |
313 | ret = drm_unbind_agp(entry->memory); |
314 | #endif |
315 | if (ret == 0) |
316 | entry->bound = 0; |
317 | return ret; |
318 | } |
319 | EXPORT_SYMBOL(drm_agp_unbind); |
320 | |
321 | |
322 | int drm_agp_unbind_ioctl(struct drm_device *dev, void *data, |
323 | struct drm_file *file_priv) |
324 | { |
325 | struct drm_agp_binding *request = data; |
326 | |
327 | return drm_agp_unbind(dev, request); |
328 | } |
329 | |
330 | /** |
331 | * Bind AGP memory into the GATT (ioctl) |
332 | * |
333 | * \param inode device inode. |
334 | * \param file_priv DRM file private. |
335 | * \param cmd command. |
336 | * \param arg pointer to a drm_agp_binding structure. |
337 | * \return zero on success or a negative number on failure. |
338 | * |
339 | * Verifies the AGP device is present and has been acquired and that no memory |
340 | * is currently bound into the GATT. Looks-up the AGP memory entry and passes |
341 | * it to bind_agp() function. |
342 | */ |
343 | int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request) |
344 | { |
345 | struct drm_agp_mem *entry; |
346 | int retcode; |
347 | int page; |
348 | |
349 | if (!dev->agp || !dev->agp->acquired) |
350 | return -EINVAL; |
351 | if (!(entry = drm_agp_lookup_entry(dev, request->handle))) |
352 | return -EINVAL; |
353 | if (entry->bound) |
354 | return -EINVAL; |
355 | page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE; |
356 | #ifdef __NetBSD__ |
357 | if ((retcode = drm_bind_agp(dev->agp->bridge, entry->memory, page))) |
358 | return retcode; |
359 | #else |
360 | if ((retcode = drm_bind_agp(entry->memory, page))) |
361 | return retcode; |
362 | #endif |
363 | entry->bound = dev->agp->base + (page << PAGE_SHIFT); |
364 | DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n" , |
365 | dev->agp->base, entry->bound); |
366 | return 0; |
367 | } |
368 | EXPORT_SYMBOL(drm_agp_bind); |
369 | |
370 | |
371 | int drm_agp_bind_ioctl(struct drm_device *dev, void *data, |
372 | struct drm_file *file_priv) |
373 | { |
374 | struct drm_agp_binding *request = data; |
375 | |
376 | return drm_agp_bind(dev, request); |
377 | } |
378 | |
379 | /** |
380 | * Free AGP memory (ioctl). |
381 | * |
382 | * \param inode device inode. |
383 | * \param file_priv DRM file private. |
384 | * \param cmd command. |
385 | * \param arg pointer to a drm_agp_buffer structure. |
386 | * \return zero on success or a negative number on failure. |
387 | * |
388 | * Verifies the AGP device is present and has been acquired and looks up the |
389 | * AGP memory entry. If the memory it's currently bound, unbind it via |
390 | * unbind_agp(). Frees it via free_agp() as well as the entry itself |
391 | * and unlinks from the doubly linked list it's inserted in. |
392 | */ |
393 | int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request) |
394 | { |
395 | struct drm_agp_mem *entry; |
396 | |
397 | if (!dev->agp || !dev->agp->acquired) |
398 | return -EINVAL; |
399 | if (!(entry = drm_agp_lookup_entry(dev, request->handle))) |
400 | return -EINVAL; |
401 | if (entry->bound) |
402 | #ifdef __NetBSD__ |
403 | drm_unbind_agp(dev->agp->bridge, entry->memory); |
404 | #else |
405 | drm_unbind_agp(entry->memory); |
406 | #endif |
407 | |
408 | list_del(&entry->head); |
409 | |
410 | #ifdef __NetBSD__ |
411 | drm_free_agp(dev->agp->bridge, entry->memory, entry->pages); |
412 | #else |
413 | drm_free_agp(entry->memory, entry->pages); |
414 | #endif |
415 | kfree(entry); |
416 | return 0; |
417 | } |
418 | EXPORT_SYMBOL(drm_agp_free); |
419 | |
420 | |
421 | |
422 | int drm_agp_free_ioctl(struct drm_device *dev, void *data, |
423 | struct drm_file *file_priv) |
424 | { |
425 | struct drm_agp_buffer *request = data; |
426 | |
427 | return drm_agp_free(dev, request); |
428 | } |
429 | |
430 | /** |
431 | * Initialize the AGP resources. |
432 | * |
433 | * \return pointer to a drm_agp_head structure. |
434 | * |
435 | * Gets the drm_agp_t structure which is made available by the agpgart module |
436 | * via the inter_module_* functions. Creates and initializes a drm_agp_head |
437 | * structure. |
438 | * |
439 | * Note that final cleanup of the kmalloced structure is directly done in |
440 | * drm_pci_agp_destroy. |
441 | */ |
442 | struct drm_agp_head *drm_agp_init(struct drm_device *dev) |
443 | { |
444 | struct drm_agp_head *head = NULL; |
445 | |
446 | if (!(head = kzalloc(sizeof(*head), GFP_KERNEL))) |
447 | return NULL; |
448 | head->bridge = agp_find_bridge(dev->pdev); |
449 | if (!head->bridge) { |
450 | if (!(head->bridge = agp_backend_acquire(dev->pdev))) { |
451 | kfree(head); |
452 | return NULL; |
453 | } |
454 | agp_copy_info(head->bridge, &head->agp_info); |
455 | agp_backend_release(head->bridge); |
456 | } else { |
457 | agp_copy_info(head->bridge, &head->agp_info); |
458 | } |
459 | #ifndef __NetBSD__ |
460 | /* Why would anything even attach in this case? */ |
461 | if (head->agp_info.chipset == NOT_SUPPORTED) { |
462 | kfree(head); |
463 | return NULL; |
464 | } |
465 | #endif |
466 | INIT_LIST_HEAD(&head->memory); |
467 | #ifdef __NetBSD__ |
468 | head->cant_use_aperture = false; /* XXX */ |
469 | head->page_mask = ~0UL; |
470 | head->base = head->agp_info.aki_info.ai_aperture_base; |
471 | #else |
472 | head->cant_use_aperture = head->agp_info.cant_use_aperture; |
473 | head->page_mask = head->agp_info.page_mask; |
474 | head->base = head->agp_info.aper_base; |
475 | #endif |
476 | return head; |
477 | } |
478 | |
479 | /** |
480 | * drm_agp_clear - Clear AGP resource list |
481 | * @dev: DRM device |
482 | * |
483 | * Iterate over all AGP resources and remove them. But keep the AGP head |
484 | * intact so it can still be used. It is safe to call this if AGP is disabled or |
485 | * was already removed. |
486 | * |
487 | * If DRIVER_MODESET is active, nothing is done to protect the modesetting |
488 | * resources from getting destroyed. Drivers are responsible of cleaning them up |
489 | * during device shutdown. |
490 | */ |
491 | void drm_agp_clear(struct drm_device *dev) |
492 | { |
493 | struct drm_agp_mem *entry, *tempe; |
494 | |
495 | if (!dev->agp) |
496 | return; |
497 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
498 | return; |
499 | |
500 | list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { |
501 | if (entry->bound) |
502 | #ifdef __NetBSD__ |
503 | drm_unbind_agp(dev->agp->bridge, entry->memory); |
504 | #endif |
505 | #ifdef __NetBSD__ |
506 | drm_free_agp(dev->agp->bridge, entry->memory, entry->pages); |
507 | #else |
508 | drm_free_agp(entry->memory, entry->pages); |
509 | #endif |
510 | kfree(entry); |
511 | } |
512 | INIT_LIST_HEAD(&dev->agp->memory); |
513 | |
514 | if (dev->agp->acquired) |
515 | drm_agp_release(dev); |
516 | |
517 | dev->agp->acquired = 0; |
518 | dev->agp->enabled = 0; |
519 | } |
520 | |
521 | #ifndef __NetBSD__ /* XXX Dead code that doesn't make sense... */ |
522 | /** |
523 | * Binds a collection of pages into AGP memory at the given offset, returning |
524 | * the AGP memory structure containing them. |
525 | * |
526 | * No reference is held on the pages during this time -- it is up to the |
527 | * caller to handle that. |
528 | */ |
529 | struct agp_memory * |
530 | drm_agp_bind_pages(struct drm_device *dev, |
531 | struct page **pages, |
532 | unsigned long num_pages, |
533 | uint32_t gtt_offset, |
534 | u32 type) |
535 | { |
536 | struct agp_memory *mem; |
537 | int ret, i; |
538 | |
539 | DRM_DEBUG("\n" ); |
540 | |
541 | mem = agp_allocate_memory(dev->agp->bridge, num_pages, |
542 | type); |
543 | if (mem == NULL) { |
544 | DRM_ERROR("Failed to allocate memory for %ld pages\n" , |
545 | num_pages); |
546 | return NULL; |
547 | } |
548 | |
549 | for (i = 0; i < num_pages; i++) |
550 | mem->pages[i] = pages[i]; |
551 | mem->page_count = num_pages; |
552 | |
553 | mem->is_flushed = true; |
554 | ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE); |
555 | if (ret != 0) { |
556 | DRM_ERROR("Failed to bind AGP memory: %d\n" , ret); |
557 | agp_free_memory(mem); |
558 | return NULL; |
559 | } |
560 | |
561 | return mem; |
562 | } |
563 | EXPORT_SYMBOL(drm_agp_bind_pages); |
564 | |
565 | #endif |
566 | |
567 | #endif /* __OS_HAS_AGP */ |
568 | |