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 /**
40 * Get AGP information.
41 *
42 * \param inode device inode.
43 * \param file_priv DRM file private.
44 * \param cmd command.
45 * \param arg pointer to a (output) drm_agp_info structure.
46 * \return zero on success or a negative number on failure.
47 *
48 * Verifies the AGP device has been initialized and acquired and fills in the
49 * drm_agp_info structure with the information in drm_agp_head::agp_info.
50 */
51 int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
52 {
53 DRM_AGP_KERN *kern;
54
55 if (!dev->agp || !dev->agp->acquired)
56 return -EINVAL;
57
58 kern = &dev->agp->agp_info;
59 info->agp_version_major = kern->version.major;
60 info->agp_version_minor = kern->version.minor;
61 info->mode = kern->mode;
62 info->aperture_base = kern->aper_base;
63 info->aperture_size = kern->aper_size * 1024 * 1024;
64 info->memory_allowed = kern->max_memory << PAGE_SHIFT;
65 info->memory_used = kern->current_memory << PAGE_SHIFT;
66 info->id_vendor = kern->device->vendor;
67 info->id_device = kern->device->device;
68
69 return 0;
70 }
71
72 EXPORT_SYMBOL(drm_agp_info);
73
74 int drm_agp_info_ioctl(struct drm_device *dev, void *data,
75 struct drm_file *file_priv)
76 {
77 struct drm_agp_info *info = data;
78 int err;
79
80 err = drm_agp_info(dev, info);
81 if (err)
82 return err;
83
84 return 0;
85 }
86
87 /**
88 * Acquire the AGP device.
89 *
90 * \param dev DRM device that is to acquire AGP.
91 * \return zero on success or a negative number on failure.
92 *
93 * Verifies the AGP device hasn't been acquired before and calls
94 * \c agp_backend_acquire.
95 */
96 int drm_agp_acquire(struct drm_device * dev)
97 {
98 if (!dev->agp)
99 return -ENODEV;
100 if (dev->agp->acquired)
101 return -EBUSY;
102 if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
103 return -ENODEV;
104 dev->agp->acquired = 1;
105 return 0;
106 }
107
108 EXPORT_SYMBOL(drm_agp_acquire);
109
110 /**
111 * Acquire the AGP device (ioctl).
112 *
113 * \param inode device inode.
114 * \param file_priv DRM file private.
115 * \param cmd command.
116 * \param arg user argument.
117 * \return zero on success or a negative number on failure.
118 *
119 * Verifies the AGP device hasn't been acquired before and calls
120 * \c agp_backend_acquire.
121 */
122 int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
123 struct drm_file *file_priv)
124 {
125 return drm_agp_acquire((struct drm_device *) file_priv->head->dev);
126 }
127
128 /**
129 * Release the AGP device.
130 *
131 * \param dev DRM device that is to release AGP.
132 * \return zero on success or a negative number on failure.
133 *
134 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
135 */
136 int drm_agp_release(struct drm_device * dev)
137 {
138 if (!dev->agp || !dev->agp->acquired)
139 return -EINVAL;
140 agp_backend_release(dev->agp->bridge);
141 dev->agp->acquired = 0;
142 return 0;
143 }
144 EXPORT_SYMBOL(drm_agp_release);
145
146 int drm_agp_release_ioctl(struct drm_device *dev, void *data,
147 struct drm_file *file_priv)
148 {
149 return drm_agp_release(dev);
150 }
151
152 /**
153 * Enable the AGP bus.
154 *
155 * \param dev DRM device that has previously acquired AGP.
156 * \param mode Requested AGP mode.
157 * \return zero on success or a negative number on failure.
158 *
159 * Verifies the AGP device has been acquired but not enabled, and calls
160 * \c agp_enable.
161 */
162 int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
163 {
164 if (!dev->agp || !dev->agp->acquired)
165 return -EINVAL;
166
167 dev->agp->mode = mode.mode;
168 agp_enable(dev->agp->bridge, mode.mode);
169 dev->agp->enabled = 1;
170 return 0;
171 }
172
173 EXPORT_SYMBOL(drm_agp_enable);
174
175 int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
176 struct drm_file *file_priv)
177 {
178 struct drm_agp_mode *mode = data;
179
180 return drm_agp_enable(dev, *mode);
181 }
182
183 /**
184 * Allocate AGP memory.
185 *
186 * \param inode device inode.
187 * \param file_priv file private pointer.
188 * \param cmd command.
189 * \param arg pointer to a drm_agp_buffer structure.
190 * \return zero on success or a negative number on failure.
191 *
192 * Verifies the AGP device is present and has been acquired, allocates the
193 * memory via alloc_agp() and creates a drm_agp_mem entry for it.
194 */
195 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
196 {
197 struct drm_agp_mem *entry;
198 DRM_AGP_MEM *memory;
199 unsigned long pages;
200 u32 type;
201
202 if (!dev->agp || !dev->agp->acquired)
203 return -EINVAL;
204 if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
205 return -ENOMEM;
206
207 memset(entry, 0, sizeof(*entry));
208
209 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
210 type = (u32) request->type;
211 if (!(memory = drm_alloc_agp(dev, pages, type))) {
212 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
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
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 */
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 */
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
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 */
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
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 */
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 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
371 return 0;
372 }
373 EXPORT_SYMBOL(drm_agp_free);
374
375
376
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 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
395 {
396 struct drm_agp_head *head = NULL;
397
398 if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
399 return NULL;
400 memset((void *)head, 0, sizeof(*head));
401 head->bridge = agp_find_bridge(dev->pdev);
402 if (!head->bridge) {
403 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
404 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
405 return NULL;
406 }
407 agp_copy_info(head->bridge, &head->agp_info);
408 agp_backend_release(head->bridge);
409 } else {
410 agp_copy_info(head->bridge, &head->agp_info);
411 }
412 if (head->agp_info.chipset == NOT_SUPPORTED) {
413 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
414 return NULL;
415 }
416 INIT_LIST_HEAD(&head->memory);
417 head->cant_use_aperture = head->agp_info.cant_use_aperture;
418 head->page_mask = head->agp_info.page_mask;
419 head->base = head->agp_info.aper_base;
420 return head;
421 }
422
423 /** Calls agp_allocate_memory() */
424 DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
425 size_t pages, u32 type)
426 {
427 return agp_allocate_memory(bridge, pages, type);
428 }
429
430 /** Calls agp_free_memory() */
431 int drm_agp_free_memory(DRM_AGP_MEM * handle)
432 {
433 if (!handle)
434 return 0;
435 agp_free_memory(handle);
436 return 1;
437 }
438
439 /** Calls agp_bind_memory() */
440 int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
441 {
442 if (!handle)
443 return -EINVAL;
444 return agp_bind_memory(handle, start);
445 }
446
447 /** Calls agp_unbind_memory() */
448 int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
449 {
450 if (!handle)
451 return -EINVAL;
452 return agp_unbind_memory(handle);
453 }
454
455 #endif /* __OS_HAS_AGP */
456
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