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/module.h>
36 #include "drm_legacy.h"
37
38 #include <dev/agp/agpreg.h>
39 #include <bus/pci/pcireg.h>
40
41 /**
42 * Get AGP information.
43 *
44 * \param inode device inode.
45 * \param file_priv DRM file private.
46 * \param cmd command.
47 * \param arg pointer to a (output) drm_agp_info structure.
48 * \return zero on success or a negative number on failure.
49 *
50 * Verifies the AGP device has been initialized and acquired and fills in the
51 * drm_agp_info structure with the information in drm_agp_head::agp_info.
52 */
drm_agp_info(struct drm_device * dev,struct drm_agp_info * info)53 int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
54 {
55 struct agp_info *kern;
56
57 if (!dev->agp || !dev->agp->acquired)
58 return -EINVAL;
59
60 kern = &dev->agp->agp_info;
61 agp_get_info(dev->agp->agpdev, kern);
62 info->agp_version_major = 1;
63 info->agp_version_minor = 0;
64 info->mode = kern->ai_mode;
65 info->aperture_base = kern->ai_aperture_base;
66 info->aperture_size = kern->ai_aperture_size;
67 info->memory_allowed = kern->ai_memory_allowed;
68 info->memory_used = kern->ai_memory_used;
69 info->id_vendor = kern->ai_devid & 0xffff;
70 info->id_device = kern->ai_devid >> 16;
71
72 return 0;
73 }
74 EXPORT_SYMBOL(drm_agp_info);
75
drm_agp_info_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)76 int drm_agp_info_ioctl(struct drm_device *dev, void *data,
77 struct drm_file *file_priv)
78 {
79 struct drm_agp_info info;
80 int err;
81
82 err = drm_agp_info(dev, &info);
83 if (err)
84 return err;
85
86 *(struct drm_agp_info *) data = info;
87 return 0;
88 }
89
90 /**
91 * Acquire the AGP device.
92 *
93 * \param dev DRM device that is to acquire AGP.
94 * \return zero on success or a negative number on failure.
95 *
96 * Verifies the AGP device hasn't been acquired before and calls
97 * \c agp_backend_acquire.
98 */
drm_agp_acquire(struct drm_device * dev)99 int drm_agp_acquire(struct drm_device *dev)
100 {
101 int retcode;
102
103 if (!dev->agp || dev->agp->acquired)
104 return -EINVAL;
105
106 retcode = -agp_acquire(dev->agp->agpdev);
107 if (retcode)
108 return retcode;
109
110 dev->agp->acquired = 1;
111 return 0;
112 }
113 EXPORT_SYMBOL(drm_agp_acquire);
114
115 /**
116 * Acquire the AGP device (ioctl).
117 *
118 * \param inode device inode.
119 * \param file_priv DRM file private.
120 * \param cmd command.
121 * \param arg user argument.
122 * \return zero on success or a negative number on failure.
123 *
124 * Verifies the AGP device hasn't been acquired before and calls
125 * \c agp_backend_acquire.
126 */
drm_agp_acquire_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)127 int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
128 struct drm_file *file_priv)
129 {
130 return drm_agp_acquire(dev);
131 }
132
133 /**
134 * Release the AGP device.
135 *
136 * \param dev DRM device that is to release AGP.
137 * \return zero on success or a negative number on failure.
138 *
139 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
140 */
drm_agp_release(struct drm_device * dev)141 int drm_agp_release(struct drm_device *dev)
142 {
143 if (!dev->agp || !dev->agp->acquired)
144 return -EINVAL;
145 agp_release(dev->agp->agpdev);
146 dev->agp->acquired = 0;
147 return 0;
148 }
149 EXPORT_SYMBOL(drm_agp_release);
150
drm_agp_release_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)151 int drm_agp_release_ioctl(struct drm_device *dev, void *data,
152 struct drm_file *file_priv)
153 {
154 return drm_agp_release(dev);
155 }
156
157 /**
158 * Enable the AGP bus.
159 *
160 * \param dev DRM device that has previously acquired AGP.
161 * \param mode Requested AGP mode.
162 * \return zero on success or a negative number on failure.
163 *
164 * Verifies the AGP device has been acquired but not enabled, and calls
165 * \c agp_enable.
166 */
drm_agp_enable(struct drm_device * dev,struct drm_agp_mode mode)167 int drm_agp_enable(struct drm_device *dev, struct drm_agp_mode mode)
168 {
169 if (!dev->agp || !dev->agp->acquired)
170 return -EINVAL;
171
172 dev->agp->mode = mode.mode;
173 agp_enable(dev->agp->agpdev, mode.mode);
174 dev->agp->enabled = 1;
175 return 0;
176 }
177 EXPORT_SYMBOL(drm_agp_enable);
178
drm_agp_enable_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)179 int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
180 struct drm_file *file_priv)
181 {
182 struct drm_agp_mode mode;
183
184 mode = *(struct drm_agp_mode *) data;
185
186 return drm_agp_enable(dev, mode);
187 }
188
drm_agp_allocate_memory(size_t pages,u32 type)189 static void *drm_agp_allocate_memory(size_t pages, u32 type)
190 {
191 device_t agpdev;
192
193 agpdev = agp_find_device();
194 if (!agpdev)
195 return NULL;
196
197 return agp_alloc_memory(agpdev, type, pages << AGP_PAGE_SHIFT);
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 */
drm_agp_alloc(struct drm_device * dev,struct drm_agp_buffer * request)212 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
213 {
214 struct drm_agp_mem *entry;
215 void *handle;
216 unsigned long pages;
217 u_int32_t type;
218 struct agp_memory_info info;
219
220 if (!dev->agp || !dev->agp->acquired)
221 return -EINVAL;
222
223 entry = kmalloc(sizeof(*entry), M_DRM, M_WAITOK | M_NULLOK | M_ZERO);
224 if (entry == NULL)
225 return -ENOMEM;
226
227 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
228 type = (u_int32_t) request->type;
229
230 handle = drm_agp_allocate_memory(pages, type);
231 if (handle == NULL) {
232 kfree(entry);
233 return -ENOMEM;
234 }
235
236 entry->handle = handle;
237 entry->bound = 0;
238 entry->pages = pages;
239 entry->prev = NULL;
240 entry->next = dev->agp->memory;
241 if (dev->agp->memory)
242 dev->agp->memory->prev = entry;
243 dev->agp->memory = entry;
244
245 agp_memory_info(dev->agp->agpdev, entry->handle, &info);
246
247 request->handle = (unsigned long) entry->handle;
248 request->physical = info.ami_physical;
249
250 return 0;
251 }
252 EXPORT_SYMBOL(drm_agp_alloc);
253
254
drm_agp_alloc_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)255 int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
256 struct drm_file *file_priv)
257 {
258 struct drm_agp_buffer request;
259 int retcode;
260
261 request = *(struct drm_agp_buffer *) data;
262
263 retcode = drm_agp_alloc(dev, &request);
264
265 *(struct drm_agp_buffer *) data = request;
266
267 return retcode;
268 }
269
270 /**
271 * Search for the AGP memory entry associated with a handle.
272 *
273 * \param dev DRM device structure.
274 * \param handle AGP memory handle.
275 * \return pointer to the drm_agp_mem structure associated with \p handle.
276 *
277 * Walks through drm_agp_head::memory until finding a matching handle.
278 */
drm_agp_lookup_entry(struct drm_device * dev,void * handle)279 static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
280 void *handle)
281 {
282 struct drm_agp_mem *entry;
283
284 for (entry = dev->agp->memory; entry; entry = entry->next) {
285 if (entry->handle == handle)
286 return entry;
287 }
288 return NULL;
289 }
290
drm_agp_unbind_memory(void * handle)291 static int drm_agp_unbind_memory(void *handle)
292 {
293 device_t agpdev;
294
295 agpdev = agp_find_device();
296 if (!agpdev || !handle)
297 return -EINVAL;
298
299 return -agp_unbind_memory(agpdev, handle);
300 }
301
302 /**
303 * Unbind AGP memory from the GATT (ioctl).
304 *
305 * \param inode device inode.
306 * \param file_priv DRM file private.
307 * \param cmd command.
308 * \param arg pointer to a drm_agp_binding structure.
309 * \return zero on success or a negative number on failure.
310 *
311 * Verifies the AGP device is present and acquired, looks-up the AGP memory
312 * entry and passes it to the unbind_agp() function.
313 */
drm_agp_unbind(struct drm_device * dev,struct drm_agp_binding * request)314 int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
315 {
316 struct drm_agp_mem *entry;
317 int ret;
318
319 if (!dev->agp || !dev->agp->acquired)
320 return -EINVAL;
321 entry = drm_agp_lookup_entry(dev, (void *)request->handle);
322 if (entry == NULL || !entry->bound)
323 return -EINVAL;
324 ret = drm_agp_unbind_memory(entry->handle);
325 if (ret == 0)
326 entry->bound = 0;
327 return ret;
328 }
329 EXPORT_SYMBOL(drm_agp_unbind);
330
331
drm_agp_unbind_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)332 int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
333 struct drm_file *file_priv)
334 {
335 struct drm_agp_binding request;
336
337 request = *(struct drm_agp_binding *) data;
338
339 return drm_agp_unbind(dev, &request);
340 }
341
drm_agp_bind_memory(void * handle,off_t start)342 static int drm_agp_bind_memory(void *handle, off_t start)
343 {
344 device_t agpdev;
345
346 agpdev = agp_find_device();
347 if (!agpdev || !handle)
348 return -EINVAL;
349
350 return -agp_bind_memory(agpdev, handle, start * PAGE_SIZE);
351 }
352
353 /**
354 * Bind AGP memory into the GATT (ioctl)
355 *
356 * \param inode device inode.
357 * \param file_priv DRM file private.
358 * \param cmd command.
359 * \param arg pointer to a drm_agp_binding structure.
360 * \return zero on success or a negative number on failure.
361 *
362 * Verifies the AGP device is present and has been acquired and that no memory
363 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
364 * it to bind_agp() function.
365 */
drm_agp_bind(struct drm_device * dev,struct drm_agp_binding * request)366 int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
367 {
368 struct drm_agp_mem *entry;
369 int retcode;
370 int page;
371
372 if (!dev->agp || !dev->agp->acquired)
373 return -EINVAL;
374
375 DRM_DEBUG("agp_bind, page_size=%x\n", (int)PAGE_SIZE);
376
377 entry = drm_agp_lookup_entry(dev, (void *)request->handle);
378 if (entry == NULL || entry->bound)
379 return -EINVAL;
380
381 page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
382
383 retcode = drm_agp_bind_memory(entry->handle, page);
384 if (retcode == 0)
385 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
386
387 return retcode;
388 }
389 EXPORT_SYMBOL(drm_agp_bind);
390
391
drm_agp_bind_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)392 int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
393 struct drm_file *file_priv)
394 {
395 struct drm_agp_binding request;
396
397 request = *(struct drm_agp_binding *) data;
398
399 return drm_agp_bind(dev, &request);
400 }
401
drm_agp_free_memory(void * handle)402 static int drm_agp_free_memory(void *handle)
403 {
404 device_t agpdev;
405
406 agpdev = agp_find_device();
407 if (!agpdev || !handle)
408 return 0;
409
410 agp_free_memory(agpdev, handle);
411 return 1;
412 }
413
414 /**
415 * Free AGP memory (ioctl).
416 *
417 * \param inode device inode.
418 * \param file_priv DRM file private.
419 * \param cmd command.
420 * \param arg pointer to a drm_agp_buffer structure.
421 * \return zero on success or a negative number on failure.
422 *
423 * Verifies the AGP device is present and has been acquired and looks up the
424 * AGP memory entry. If the memory it's currently bound, unbind it via
425 * unbind_agp(). Frees it via free_agp() as well as the entry itself
426 * and unlinks from the doubly linked list it's inserted in.
427 */
drm_agp_free(struct drm_device * dev,struct drm_agp_buffer * request)428 int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
429 {
430 struct drm_agp_mem *entry;
431
432 if (!dev->agp || !dev->agp->acquired)
433 return -EINVAL;
434 entry = drm_agp_lookup_entry(dev, (void*)request->handle);
435 if (entry == NULL)
436 return -EINVAL;
437
438 if (entry->prev)
439 entry->prev->next = entry->next;
440 else
441 dev->agp->memory = entry->next;
442 if (entry->next)
443 entry->next->prev = entry->prev;
444
445 if (entry->bound)
446 drm_agp_unbind_memory(entry->handle);
447
448 drm_agp_free_memory(entry->handle);
449 kfree(entry);
450 return 0;
451 }
452 EXPORT_SYMBOL(drm_agp_free);
453
454
drm_agp_free_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)455 int drm_agp_free_ioctl(struct drm_device *dev, void *data,
456 struct drm_file *file_priv)
457 {
458 struct drm_agp_buffer request;
459
460 request = *(struct drm_agp_buffer *) data;
461
462 return drm_agp_free(dev, &request);
463 }
464
465 /**
466 * Initialize the AGP resources.
467 *
468 * \return pointer to a drm_agp_head structure.
469 *
470 * Gets the drm_agp_t structure which is made available by the agpgart module
471 * via the inter_module_* functions. Creates and initializes a drm_agp_head
472 * structure.
473 *
474 * Note that final cleanup of the kmalloced structure is directly done in
475 * drm_pci_agp_destroy.
476 */
drm_agp_init(struct drm_device * dev)477 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
478 {
479 device_t agpdev;
480 struct drm_agp_head *head = NULL;
481 int agp_available = 1;
482
483 agpdev = agp_find_device();
484 if (!agpdev)
485 agp_available = 0;
486
487 DRM_DEBUG("agp_available = %d\n", agp_available);
488
489 if (agp_available) {
490 head = kmalloc(sizeof(*head), M_DRM,
491 M_WAITOK | M_NULLOK | M_ZERO);
492 if (head == NULL)
493 return NULL;
494 head->agpdev = agpdev;
495 agp_get_info(agpdev, &head->agp_info);
496 head->base = head->agp_info.ai_aperture_base;
497 head->memory = NULL;
498 DRM_INFO("AGP at 0x%08lx %dMB\n",
499 (long)head->agp_info.ai_aperture_base,
500 (int)(head->agp_info.ai_aperture_size >> 20));
501 }
502 return head;
503 }
504 /* Only exported for i810.ko */
505 EXPORT_SYMBOL(drm_agp_init);
506
507 /**
508 * drm_legacy_agp_clear - Clear AGP resource list
509 * @dev: DRM device
510 *
511 * Iterate over all AGP resources and remove them. But keep the AGP head
512 * intact so it can still be used. It is safe to call this if AGP is disabled or
513 * was already removed.
514 *
515 * Cleanup is only done for drivers who have DRIVER_LEGACY set.
516 */
drm_legacy_agp_clear(struct drm_device * dev)517 void drm_legacy_agp_clear(struct drm_device *dev)
518 {
519 struct drm_agp_mem *entry, *nexte;
520
521 if (!dev->agp)
522 return;
523 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
524 return;
525
526 /* Remove AGP resources, but leave dev->agp intact until
527 * drm_unload is called.
528 */
529 for (entry = dev->agp->memory; entry; entry = nexte) {
530 nexte = entry->next;
531 if (entry->bound)
532 drm_agp_unbind_memory(entry->handle);
533 drm_agp_free_memory(entry->handle);
534 kfree(entry);
535 }
536 dev->agp->memory = NULL;
537
538 if (dev->agp->acquired)
539 drm_agp_release(dev);
540
541 dev->agp->acquired = 0;
542 dev->agp->enabled = 0;
543 }
544