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 "drmP.h"
35 #include <linux/module.h>
36
37 #if __OS_HAS_AGP
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 */
53 int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
54 {
55 DRM_AGP_KERN *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
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 */
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 */
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 */
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
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 */
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
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 alloc_agp() and creates a drm_agp_mem entry for it.
196 */
197 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
198 {
199 struct drm_agp_mem *entry;
200 DRM_AGP_MEM *memory;
201 unsigned long pages;
202 u32 type;
203
204 if (!dev->agp || !dev->agp->acquired)
205 return -EINVAL;
206 if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL)))
207 return -ENOMEM;
208
209 memset(entry, 0, sizeof(*entry));
210
211 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
212 type = (u32) request->type;
213 if (!(memory = drm_alloc_agp(dev, pages, type))) {
214 kfree(entry);
215 return -ENOMEM;
216 }
217
218 entry->handle = (unsigned long)memory->key + 1;
219 entry->memory = memory;
220 entry->bound = 0;
221 entry->pages = pages;
222 list_add(&entry->head, &dev->agp->memory);
223
224 request->handle = entry->handle;
225 request->physical = memory->physical;
226
227 return 0;
228 }
229 EXPORT_SYMBOL(drm_agp_alloc);
230
231
232 int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
233 struct drm_file *file_priv)
234 {
235 struct drm_agp_buffer *request = data;
236
237 return drm_agp_alloc(dev, request);
238 }
239
240 /**
241 * Search for the AGP memory entry associated with a handle.
242 *
243 * \param dev DRM device structure.
244 * \param handle AGP memory handle.
245 * \return pointer to the drm_agp_mem structure associated with \p handle.
246 *
247 * Walks through drm_agp_head::memory until finding a matching handle.
248 */
249 static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
250 unsigned long handle)
251 {
252 struct drm_agp_mem *entry;
253
254 list_for_each_entry(entry, &dev->agp->memory, head) {
255 if (entry->handle == handle)
256 return entry;
257 }
258 return NULL;
259 }
260
261 /**
262 * Unbind AGP memory from the GATT (ioctl).
263 *
264 * \param inode device inode.
265 * \param file_priv DRM file private.
266 * \param cmd command.
267 * \param arg pointer to a drm_agp_binding structure.
268 * \return zero on success or a negative number on failure.
269 *
270 * Verifies the AGP device is present and acquired, looks-up the AGP memory
271 * entry and passes it to the unbind_agp() function.
272 */
273 int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
274 {
275 struct drm_agp_mem *entry;
276 int ret;
277
278 if (!dev->agp || !dev->agp->acquired)
279 return -EINVAL;
280 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
281 return -EINVAL;
282 if (!entry->bound)
283 return -EINVAL;
284 ret = drm_unbind_agp(entry->memory);
285 if (ret == 0)
286 entry->bound = 0;
287 return ret;
288 }
289 EXPORT_SYMBOL(drm_agp_unbind);
290
291
292 int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
293 struct drm_file *file_priv)
294 {
295 struct drm_agp_binding *request = data;
296
297 return drm_agp_unbind(dev, request);
298 }
299
300 /**
301 * Bind AGP memory into the GATT (ioctl)
302 *
303 * \param inode device inode.
304 * \param file_priv DRM file private.
305 * \param cmd command.
306 * \param arg pointer to a drm_agp_binding structure.
307 * \return zero on success or a negative number on failure.
308 *
309 * Verifies the AGP device is present and has been acquired and that no memory
310 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
311 * it to bind_agp() function.
312 */
313 int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
314 {
315 struct drm_agp_mem *entry;
316 int retcode;
317 int page;
318
319 if (!dev->agp || !dev->agp->acquired)
320 return -EINVAL;
321 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
322 return -EINVAL;
323 if (entry->bound)
324 return -EINVAL;
325 page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
326 if ((retcode = drm_bind_agp(entry->memory, page)))
327 return retcode;
328 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
329 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
330 dev->agp->base, entry->bound);
331 return 0;
332 }
333 EXPORT_SYMBOL(drm_agp_bind);
334
335
336 int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
337 struct drm_file *file_priv)
338 {
339 struct drm_agp_binding *request = data;
340
341 return drm_agp_bind(dev, request);
342 }
343
344 /**
345 * Free AGP memory (ioctl).
346 *
347 * \param inode device inode.
348 * \param file_priv DRM file private.
349 * \param cmd command.
350 * \param arg pointer to a drm_agp_buffer structure.
351 * \return zero on success or a negative number on failure.
352 *
353 * Verifies the AGP device is present and has been acquired and looks up the
354 * AGP memory entry. If the memory it's currently bound, unbind it via
355 * unbind_agp(). Frees it via free_agp() as well as the entry itself
356 * and unlinks from the doubly linked list it's inserted in.
357 */
358 int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
359 {
360 struct drm_agp_mem *entry;
361
362 if (!dev->agp || !dev->agp->acquired)
363 return -EINVAL;
364 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
365 return -EINVAL;
366 if (entry->bound)
367 drm_unbind_agp(entry->memory);
368
369 list_del(&entry->head);
370
371 drm_free_agp(entry->memory, entry->pages);
372 kfree(entry);
373 return 0;
374 }
375 EXPORT_SYMBOL(drm_agp_free);
376
377
378
379 int drm_agp_free_ioctl(struct drm_device *dev, void *data,
380 struct drm_file *file_priv)
381 {
382 struct drm_agp_buffer *request = data;
383
384 return drm_agp_free(dev, request);
385 }
386
387 /**
388 * Initialize the AGP resources.
389 *
390 * \return pointer to a drm_agp_head structure.
391 *
392 * Gets the drm_agp_t structure which is made available by the agpgart module
393 * via the inter_module_* functions. Creates and initializes a drm_agp_head
394 * structure.
395 */
396 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
397 {
398 struct drm_agp_head *head = NULL;
399
400 if (!(head = kmalloc(sizeof(*head), GFP_KERNEL)))
401 return NULL;
402 memset((void *)head, 0, sizeof(*head));
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 /** Calls agp_allocate_memory() */
426 DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
427 size_t pages, u32 type)
428 {
429 return agp_allocate_memory(bridge, pages, type);
430 }
431
432 /** Calls agp_free_memory() */
433 int drm_agp_free_memory(DRM_AGP_MEM * handle)
434 {
435 if (!handle)
436 return 0;
437 agp_free_memory(handle);
438 return 1;
439 }
440
441 /** Calls agp_bind_memory() */
442 int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
443 {
444 if (!handle)
445 return -EINVAL;
446 return agp_bind_memory(handle, start);
447 }
448
449 /** Calls agp_unbind_memory() */
450 int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
451 {
452 if (!handle)
453 return -EINVAL;
454 return agp_unbind_memory(handle);
455 }
456
457 /**
458 * Binds a collection of pages into AGP memory at the given offset, returning
459 * the AGP memory structure containing them.
460 *
461 * No reference is held on the pages during this time -- it is up to the
462 * caller to handle that.
463 */
464 DRM_AGP_MEM *
465 drm_agp_bind_pages(struct drm_device *dev,
466 struct page **pages,
467 unsigned long num_pages,
468 uint32_t gtt_offset,
469 u32 type)
470 {
471 DRM_AGP_MEM *mem;
472 int ret, i;
473
474 DRM_DEBUG("\n");
475
476 mem = drm_agp_allocate_memory(dev->agp->bridge, num_pages,
477 type);
478 if (mem == NULL) {
479 DRM_ERROR("Failed to allocate memory for %ld pages\n",
480 num_pages);
481 return NULL;
482 }
483
484 for (i = 0; i < num_pages; i++)
485 mem->pages[i] = pages[i];
486 mem->page_count = num_pages;
487
488 mem->is_flushed = true;
489 ret = drm_agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
490 if (ret != 0) {
491 DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
492 agp_free_memory(mem);
493 return NULL;
494 }
495
496 return mem;
497 }
498 EXPORT_SYMBOL(drm_agp_bind_pages);
499
500 void drm_agp_chipset_flush(struct drm_device *dev)
501 {
502 agp_flush_chipset(dev->agp->bridge);
503 }
504 EXPORT_SYMBOL(drm_agp_chipset_flush);
505
506 #endif /* __OS_HAS_AGP */
507
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