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 <linux/slab.h>
37 #include "drm_legacy.h"
38
39 #include <asm/agp.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_kern_info *kern;
56
57 if (!dev->agp || !dev->agp->acquired)
58 return -EINVAL;
59
60 kern = &dev->agp->agp_info;
61 info->agp_version_major = kern->version.major;
62 info->agp_version_minor = kern->version.minor;
63 info->mode = kern->mode;
64 info->aperture_base = kern->aper_base;
65 info->aperture_size = kern->aper_size * 1024 * 1024;
66 info->memory_allowed = kern->max_memory << PAGE_SHIFT;
67 info->memory_used = kern->current_memory << PAGE_SHIFT;
68 info->id_vendor = kern->device->vendor;
69 info->id_device = kern->device->device;
70
71 return 0;
72 }
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 = data;
80 int err;
81
82 err = drm_agp_info(dev, info);
83 if (err)
84 return err;
85
86 return 0;
87 }
88
89 /**
90 * Acquire the AGP device.
91 *
92 * \param dev DRM device that is to acquire AGP.
93 * \return zero on success or a negative number on failure.
94 *
95 * Verifies the AGP device hasn't been acquired before and calls
96 * \c agp_backend_acquire.
97 */
drm_agp_acquire(struct drm_device * dev)98 int drm_agp_acquire(struct drm_device * dev)
99 {
100 if (!dev->agp)
101 return -ENODEV;
102 if (dev->agp->acquired)
103 return -EBUSY;
104 if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
105 return -ENODEV;
106 dev->agp->acquired = 1;
107 return 0;
108 }
109
110 EXPORT_SYMBOL(drm_agp_acquire);
111
112 /**
113 * Acquire the AGP device (ioctl).
114 *
115 * \param inode device inode.
116 * \param file_priv DRM file private.
117 * \param cmd command.
118 * \param arg user argument.
119 * \return zero on success or a negative number on failure.
120 *
121 * Verifies the AGP device hasn't been acquired before and calls
122 * \c agp_backend_acquire.
123 */
drm_agp_acquire_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)124 int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
125 struct drm_file *file_priv)
126 {
127 return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
128 }
129
130 /**
131 * Release the AGP device.
132 *
133 * \param dev DRM device that is to release AGP.
134 * \return zero on success or a negative number on failure.
135 *
136 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
137 */
drm_agp_release(struct drm_device * dev)138 int drm_agp_release(struct drm_device * dev)
139 {
140 if (!dev->agp || !dev->agp->acquired)
141 return -EINVAL;
142 agp_backend_release(dev->agp->bridge);
143 dev->agp->acquired = 0;
144 return 0;
145 }
146 EXPORT_SYMBOL(drm_agp_release);
147
drm_agp_release_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)148 int drm_agp_release_ioctl(struct drm_device *dev, void *data,
149 struct drm_file *file_priv)
150 {
151 return drm_agp_release(dev);
152 }
153
154 /**
155 * Enable the AGP bus.
156 *
157 * \param dev DRM device that has previously acquired AGP.
158 * \param mode Requested AGP mode.
159 * \return zero on success or a negative number on failure.
160 *
161 * Verifies the AGP device has been acquired but not enabled, and calls
162 * \c agp_enable.
163 */
drm_agp_enable(struct drm_device * dev,struct drm_agp_mode mode)164 int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
165 {
166 if (!dev->agp || !dev->agp->acquired)
167 return -EINVAL;
168
169 dev->agp->mode = mode.mode;
170 agp_enable(dev->agp->bridge, mode.mode);
171 dev->agp->enabled = 1;
172 return 0;
173 }
174
175 EXPORT_SYMBOL(drm_agp_enable);
176
drm_agp_enable_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)177 int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
178 struct drm_file *file_priv)
179 {
180 struct drm_agp_mode *mode = data;
181
182 return drm_agp_enable(dev, *mode);
183 }
184
185 /**
186 * Allocate AGP memory.
187 *
188 * \param inode device inode.
189 * \param file_priv file private pointer.
190 * \param cmd command.
191 * \param arg pointer to a drm_agp_buffer structure.
192 * \return zero on success or a negative number on failure.
193 *
194 * Verifies the AGP device is present and has been acquired, allocates the
195 * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
196 */
drm_agp_alloc(struct drm_device * dev,struct drm_agp_buffer * request)197 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
198 {
199 struct drm_agp_mem *entry;
200 struct agp_memory *memory;
201 unsigned long pages;
202 u32 type;
203
204 if (!dev->agp || !dev->agp->acquired)
205 return -EINVAL;
206 if (!(entry = kzalloc(sizeof(*entry), GFP_KERNEL)))
207 return -ENOMEM;
208
209 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
210 type = (u32) request->type;
211 if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) {
212 kfree(entry);
213 return -ENOMEM;
214 }
215
216 entry->handle = (unsigned long)memory->key + 1;
217 entry->memory = memory;
218 entry->bound = 0;
219 entry->pages = pages;
220 list_add(&entry->head, &dev->agp->memory);
221
222 request->handle = entry->handle;
223 request->physical = memory->physical;
224
225 return 0;
226 }
227 EXPORT_SYMBOL(drm_agp_alloc);
228
229
drm_agp_alloc_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)230 int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
231 struct drm_file *file_priv)
232 {
233 struct drm_agp_buffer *request = data;
234
235 return drm_agp_alloc(dev, request);
236 }
237
238 /**
239 * Search for the AGP memory entry associated with a handle.
240 *
241 * \param dev DRM device structure.
242 * \param handle AGP memory handle.
243 * \return pointer to the drm_agp_mem structure associated with \p handle.
244 *
245 * Walks through drm_agp_head::memory until finding a matching handle.
246 */
drm_agp_lookup_entry(struct drm_device * dev,unsigned long handle)247 static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
248 unsigned long handle)
249 {
250 struct drm_agp_mem *entry;
251
252 list_for_each_entry(entry, &dev->agp->memory, head) {
253 if (entry->handle == handle)
254 return entry;
255 }
256 return NULL;
257 }
258
259 /**
260 * Unbind AGP memory from the GATT (ioctl).
261 *
262 * \param inode device inode.
263 * \param file_priv DRM file private.
264 * \param cmd command.
265 * \param arg pointer to a drm_agp_binding structure.
266 * \return zero on success or a negative number on failure.
267 *
268 * Verifies the AGP device is present and acquired, looks-up the AGP memory
269 * entry and passes it to the unbind_agp() function.
270 */
drm_agp_unbind(struct drm_device * dev,struct drm_agp_binding * request)271 int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
272 {
273 struct drm_agp_mem *entry;
274 int ret;
275
276 if (!dev->agp || !dev->agp->acquired)
277 return -EINVAL;
278 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
279 return -EINVAL;
280 if (!entry->bound)
281 return -EINVAL;
282 ret = drm_unbind_agp(entry->memory);
283 if (ret == 0)
284 entry->bound = 0;
285 return ret;
286 }
287 EXPORT_SYMBOL(drm_agp_unbind);
288
289
drm_agp_unbind_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)290 int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
291 struct drm_file *file_priv)
292 {
293 struct drm_agp_binding *request = data;
294
295 return drm_agp_unbind(dev, request);
296 }
297
298 /**
299 * Bind AGP memory into the GATT (ioctl)
300 *
301 * \param inode device inode.
302 * \param file_priv DRM file private.
303 * \param cmd command.
304 * \param arg pointer to a drm_agp_binding structure.
305 * \return zero on success or a negative number on failure.
306 *
307 * Verifies the AGP device is present and has been acquired and that no memory
308 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
309 * it to bind_agp() function.
310 */
drm_agp_bind(struct drm_device * dev,struct drm_agp_binding * request)311 int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
312 {
313 struct drm_agp_mem *entry;
314 int retcode;
315 int page;
316
317 if (!dev->agp || !dev->agp->acquired)
318 return -EINVAL;
319 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
320 return -EINVAL;
321 if (entry->bound)
322 return -EINVAL;
323 page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
324 if ((retcode = drm_bind_agp(entry->memory, page)))
325 return retcode;
326 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
327 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
328 dev->agp->base, entry->bound);
329 return 0;
330 }
331 EXPORT_SYMBOL(drm_agp_bind);
332
333
drm_agp_bind_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)334 int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
335 struct drm_file *file_priv)
336 {
337 struct drm_agp_binding *request = data;
338
339 return drm_agp_bind(dev, request);
340 }
341
342 /**
343 * Free AGP memory (ioctl).
344 *
345 * \param inode device inode.
346 * \param file_priv DRM file private.
347 * \param cmd command.
348 * \param arg pointer to a drm_agp_buffer structure.
349 * \return zero on success or a negative number on failure.
350 *
351 * Verifies the AGP device is present and has been acquired and looks up the
352 * AGP memory entry. If the memory it's currently bound, unbind it via
353 * unbind_agp(). Frees it via free_agp() as well as the entry itself
354 * and unlinks from the doubly linked list it's inserted in.
355 */
drm_agp_free(struct drm_device * dev,struct drm_agp_buffer * request)356 int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
357 {
358 struct drm_agp_mem *entry;
359
360 if (!dev->agp || !dev->agp->acquired)
361 return -EINVAL;
362 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
363 return -EINVAL;
364 if (entry->bound)
365 drm_unbind_agp(entry->memory);
366
367 list_del(&entry->head);
368
369 drm_free_agp(entry->memory, entry->pages);
370 kfree(entry);
371 return 0;
372 }
373 EXPORT_SYMBOL(drm_agp_free);
374
375
376
drm_agp_free_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)377 int drm_agp_free_ioctl(struct drm_device *dev, void *data,
378 struct drm_file *file_priv)
379 {
380 struct drm_agp_buffer *request = data;
381
382 return drm_agp_free(dev, request);
383 }
384
385 /**
386 * Initialize the AGP resources.
387 *
388 * \return pointer to a drm_agp_head structure.
389 *
390 * Gets the drm_agp_t structure which is made available by the agpgart module
391 * via the inter_module_* functions. Creates and initializes a drm_agp_head
392 * structure.
393 *
394 * Note that final cleanup of the kmalloced structure is directly done in
395 * drm_pci_agp_destroy.
396 */
drm_agp_init(struct drm_device * dev)397 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
398 {
399 struct drm_agp_head *head = NULL;
400
401 if (!(head = kzalloc(sizeof(*head), GFP_KERNEL)))
402 return NULL;
403 head->bridge = agp_find_bridge(dev->pdev);
404 if (!head->bridge) {
405 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
406 kfree(head);
407 return NULL;
408 }
409 agp_copy_info(head->bridge, &head->agp_info);
410 agp_backend_release(head->bridge);
411 } else {
412 agp_copy_info(head->bridge, &head->agp_info);
413 }
414 if (head->agp_info.chipset == NOT_SUPPORTED) {
415 kfree(head);
416 return NULL;
417 }
418 INIT_LIST_HEAD(&head->memory);
419 head->cant_use_aperture = head->agp_info.cant_use_aperture;
420 head->page_mask = head->agp_info.page_mask;
421 head->base = head->agp_info.aper_base;
422 return head;
423 }
424
425 /**
426 * drm_agp_clear - Clear AGP resource list
427 * @dev: DRM device
428 *
429 * Iterate over all AGP resources and remove them. But keep the AGP head
430 * intact so it can still be used. It is safe to call this if AGP is disabled or
431 * was already removed.
432 *
433 * If DRIVER_MODESET is active, nothing is done to protect the modesetting
434 * resources from getting destroyed. Drivers are responsible of cleaning them up
435 * during device shutdown.
436 */
drm_agp_clear(struct drm_device * dev)437 void drm_agp_clear(struct drm_device *dev)
438 {
439 struct drm_agp_mem *entry, *tempe;
440
441 if (!dev->agp)
442 return;
443 if (drm_core_check_feature(dev, DRIVER_MODESET))
444 return;
445
446 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
447 if (entry->bound)
448 drm_unbind_agp(entry->memory);
449 drm_free_agp(entry->memory, entry->pages);
450 kfree(entry);
451 }
452 INIT_LIST_HEAD(&dev->agp->memory);
453
454 if (dev->agp->acquired)
455 drm_agp_release(dev);
456
457 dev->agp->acquired = 0;
458 dev->agp->enabled = 0;
459 }
460
461 /**
462 * Binds a collection of pages into AGP memory at the given offset, returning
463 * the AGP memory structure containing them.
464 *
465 * No reference is held on the pages during this time -- it is up to the
466 * caller to handle that.
467 */
468 struct agp_memory *
drm_agp_bind_pages(struct drm_device * dev,struct page ** pages,unsigned long num_pages,uint32_t gtt_offset,u32 type)469 drm_agp_bind_pages(struct drm_device *dev,
470 struct page **pages,
471 unsigned long num_pages,
472 uint32_t gtt_offset,
473 u32 type)
474 {
475 struct agp_memory *mem;
476 int ret, i;
477
478 DRM_DEBUG("\n");
479
480 mem = agp_allocate_memory(dev->agp->bridge, num_pages,
481 type);
482 if (mem == NULL) {
483 DRM_ERROR("Failed to allocate memory for %ld pages\n",
484 num_pages);
485 return NULL;
486 }
487
488 for (i = 0; i < num_pages; i++)
489 mem->pages[i] = pages[i];
490 mem->page_count = num_pages;
491
492 mem->is_flushed = true;
493 ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
494 if (ret != 0) {
495 DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
496 agp_free_memory(mem);
497 return NULL;
498 }
499
500 return mem;
501 }
502 EXPORT_SYMBOL(drm_agp_bind_pages);
503