Loading...
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#include <linux/slab.h>
37
38#if __OS_HAS_AGP
39
40#include <asm/agp.h>
41
42/**
43 * Get AGP information.
44 *
45 * \param inode device inode.
46 * \param file_priv DRM file private.
47 * \param cmd command.
48 * \param arg pointer to a (output) drm_agp_info structure.
49 * \return zero on success or a negative number on failure.
50 *
51 * Verifies the AGP device has been initialized and acquired and fills in the
52 * drm_agp_info structure with the information in drm_agp_head::agp_info.
53 */
54int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
55{
56 DRM_AGP_KERN *kern;
57
58 if (!dev->agp || !dev->agp->acquired)
59 return -EINVAL;
60
61 kern = &dev->agp->agp_info;
62 info->agp_version_major = kern->version.major;
63 info->agp_version_minor = kern->version.minor;
64 info->mode = kern->mode;
65 info->aperture_base = kern->aper_base;
66 info->aperture_size = kern->aper_size * 1024 * 1024;
67 info->memory_allowed = kern->max_memory << PAGE_SHIFT;
68 info->memory_used = kern->current_memory << PAGE_SHIFT;
69 info->id_vendor = kern->device->vendor;
70 info->id_device = kern->device->device;
71
72 return 0;
73}
74
75EXPORT_SYMBOL(drm_agp_info);
76
77int drm_agp_info_ioctl(struct drm_device *dev, void *data,
78 struct drm_file *file_priv)
79{
80 struct drm_agp_info *info = data;
81 int err;
82
83 err = drm_agp_info(dev, info);
84 if (err)
85 return err;
86
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 */
99int drm_agp_acquire(struct drm_device * dev)
100{
101 if (!dev->agp)
102 return -ENODEV;
103 if (dev->agp->acquired)
104 return -EBUSY;
105 if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
106 return -ENODEV;
107 dev->agp->acquired = 1;
108 return 0;
109}
110
111EXPORT_SYMBOL(drm_agp_acquire);
112
113/**
114 * Acquire the AGP device (ioctl).
115 *
116 * \param inode device inode.
117 * \param file_priv DRM file private.
118 * \param cmd command.
119 * \param arg user argument.
120 * \return zero on success or a negative number on failure.
121 *
122 * Verifies the AGP device hasn't been acquired before and calls
123 * \c agp_backend_acquire.
124 */
125int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
126 struct drm_file *file_priv)
127{
128 return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
129}
130
131/**
132 * Release the AGP device.
133 *
134 * \param dev DRM device that is to release AGP.
135 * \return zero on success or a negative number on failure.
136 *
137 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
138 */
139int drm_agp_release(struct drm_device * dev)
140{
141 if (!dev->agp || !dev->agp->acquired)
142 return -EINVAL;
143 agp_backend_release(dev->agp->bridge);
144 dev->agp->acquired = 0;
145 return 0;
146}
147EXPORT_SYMBOL(drm_agp_release);
148
149int drm_agp_release_ioctl(struct drm_device *dev, void *data,
150 struct drm_file *file_priv)
151{
152 return drm_agp_release(dev);
153}
154
155/**
156 * Enable the AGP bus.
157 *
158 * \param dev DRM device that has previously acquired AGP.
159 * \param mode Requested AGP mode.
160 * \return zero on success or a negative number on failure.
161 *
162 * Verifies the AGP device has been acquired but not enabled, and calls
163 * \c agp_enable.
164 */
165int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
166{
167 if (!dev->agp || !dev->agp->acquired)
168 return -EINVAL;
169
170 dev->agp->mode = mode.mode;
171 agp_enable(dev->agp->bridge, mode.mode);
172 dev->agp->enabled = 1;
173 return 0;
174}
175
176EXPORT_SYMBOL(drm_agp_enable);
177
178int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
179 struct drm_file *file_priv)
180{
181 struct drm_agp_mode *mode = data;
182
183 return drm_agp_enable(dev, *mode);
184}
185
186/**
187 * Allocate AGP memory.
188 *
189 * \param inode device inode.
190 * \param file_priv file private pointer.
191 * \param cmd command.
192 * \param arg pointer to a drm_agp_buffer structure.
193 * \return zero on success or a negative number on failure.
194 *
195 * Verifies the AGP device is present and has been acquired, allocates the
196 * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
197 */
198int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
199{
200 struct drm_agp_mem *entry;
201 DRM_AGP_MEM *memory;
202 unsigned long pages;
203 u32 type;
204
205 if (!dev->agp || !dev->agp->acquired)
206 return -EINVAL;
207 if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL)))
208 return -ENOMEM;
209
210 memset(entry, 0, sizeof(*entry));
211
212 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
213 type = (u32) request->type;
214 if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) {
215 kfree(entry);
216 return -ENOMEM;
217 }
218
219 entry->handle = (unsigned long)memory->key + 1;
220 entry->memory = memory;
221 entry->bound = 0;
222 entry->pages = pages;
223 list_add(&entry->head, &dev->agp->memory);
224
225 request->handle = entry->handle;
226 request->physical = memory->physical;
227
228 return 0;
229}
230EXPORT_SYMBOL(drm_agp_alloc);
231
232
233int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
234 struct drm_file *file_priv)
235{
236 struct drm_agp_buffer *request = data;
237
238 return drm_agp_alloc(dev, request);
239}
240
241/**
242 * Search for the AGP memory entry associated with a handle.
243 *
244 * \param dev DRM device structure.
245 * \param handle AGP memory handle.
246 * \return pointer to the drm_agp_mem structure associated with \p handle.
247 *
248 * Walks through drm_agp_head::memory until finding a matching handle.
249 */
250static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
251 unsigned long handle)
252{
253 struct drm_agp_mem *entry;
254
255 list_for_each_entry(entry, &dev->agp->memory, head) {
256 if (entry->handle == handle)
257 return entry;
258 }
259 return NULL;
260}
261
262/**
263 * Unbind AGP memory from the GATT (ioctl).
264 *
265 * \param inode device inode.
266 * \param file_priv DRM file private.
267 * \param cmd command.
268 * \param arg pointer to a drm_agp_binding structure.
269 * \return zero on success or a negative number on failure.
270 *
271 * Verifies the AGP device is present and acquired, looks-up the AGP memory
272 * entry and passes it to the unbind_agp() function.
273 */
274int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
275{
276 struct drm_agp_mem *entry;
277 int ret;
278
279 if (!dev->agp || !dev->agp->acquired)
280 return -EINVAL;
281 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
282 return -EINVAL;
283 if (!entry->bound)
284 return -EINVAL;
285 ret = drm_unbind_agp(entry->memory);
286 if (ret == 0)
287 entry->bound = 0;
288 return ret;
289}
290EXPORT_SYMBOL(drm_agp_unbind);
291
292
293int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
294 struct drm_file *file_priv)
295{
296 struct drm_agp_binding *request = data;
297
298 return drm_agp_unbind(dev, request);
299}
300
301/**
302 * Bind AGP memory into the GATT (ioctl)
303 *
304 * \param inode device inode.
305 * \param file_priv DRM file private.
306 * \param cmd command.
307 * \param arg pointer to a drm_agp_binding structure.
308 * \return zero on success or a negative number on failure.
309 *
310 * Verifies the AGP device is present and has been acquired and that no memory
311 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
312 * it to bind_agp() function.
313 */
314int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
315{
316 struct drm_agp_mem *entry;
317 int retcode;
318 int page;
319
320 if (!dev->agp || !dev->agp->acquired)
321 return -EINVAL;
322 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
323 return -EINVAL;
324 if (entry->bound)
325 return -EINVAL;
326 page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
327 if ((retcode = drm_bind_agp(entry->memory, page)))
328 return retcode;
329 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
330 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
331 dev->agp->base, entry->bound);
332 return 0;
333}
334EXPORT_SYMBOL(drm_agp_bind);
335
336
337int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
338 struct drm_file *file_priv)
339{
340 struct drm_agp_binding *request = data;
341
342 return drm_agp_bind(dev, request);
343}
344
345/**
346 * Free AGP memory (ioctl).
347 *
348 * \param inode device inode.
349 * \param file_priv DRM file private.
350 * \param cmd command.
351 * \param arg pointer to a drm_agp_buffer structure.
352 * \return zero on success or a negative number on failure.
353 *
354 * Verifies the AGP device is present and has been acquired and looks up the
355 * AGP memory entry. If the memory it's currently bound, unbind it via
356 * unbind_agp(). Frees it via free_agp() as well as the entry itself
357 * and unlinks from the doubly linked list it's inserted in.
358 */
359int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
360{
361 struct drm_agp_mem *entry;
362
363 if (!dev->agp || !dev->agp->acquired)
364 return -EINVAL;
365 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
366 return -EINVAL;
367 if (entry->bound)
368 drm_unbind_agp(entry->memory);
369
370 list_del(&entry->head);
371
372 drm_free_agp(entry->memory, entry->pages);
373 kfree(entry);
374 return 0;
375}
376EXPORT_SYMBOL(drm_agp_free);
377
378
379
380int drm_agp_free_ioctl(struct drm_device *dev, void *data,
381 struct drm_file *file_priv)
382{
383 struct drm_agp_buffer *request = data;
384
385 return drm_agp_free(dev, request);
386}
387
388/**
389 * Initialize the AGP resources.
390 *
391 * \return pointer to a drm_agp_head structure.
392 *
393 * Gets the drm_agp_t structure which is made available by the agpgart module
394 * via the inter_module_* functions. Creates and initializes a drm_agp_head
395 * structure.
396 */
397struct drm_agp_head *drm_agp_init(struct drm_device *dev)
398{
399 struct drm_agp_head *head = NULL;
400
401 if (!(head = kmalloc(sizeof(*head), GFP_KERNEL)))
402 return NULL;
403 memset((void *)head, 0, sizeof(*head));
404 head->bridge = agp_find_bridge(dev->pdev);
405 if (!head->bridge) {
406 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
407 kfree(head);
408 return NULL;
409 }
410 agp_copy_info(head->bridge, &head->agp_info);
411 agp_backend_release(head->bridge);
412 } else {
413 agp_copy_info(head->bridge, &head->agp_info);
414 }
415 if (head->agp_info.chipset == NOT_SUPPORTED) {
416 kfree(head);
417 return NULL;
418 }
419 INIT_LIST_HEAD(&head->memory);
420 head->cant_use_aperture = head->agp_info.cant_use_aperture;
421 head->page_mask = head->agp_info.page_mask;
422 head->base = head->agp_info.aper_base;
423 return head;
424}
425
426/**
427 * Binds a collection of pages into AGP memory at the given offset, returning
428 * the AGP memory structure containing them.
429 *
430 * No reference is held on the pages during this time -- it is up to the
431 * caller to handle that.
432 */
433DRM_AGP_MEM *
434drm_agp_bind_pages(struct drm_device *dev,
435 struct page **pages,
436 unsigned long num_pages,
437 uint32_t gtt_offset,
438 u32 type)
439{
440 DRM_AGP_MEM *mem;
441 int ret, i;
442
443 DRM_DEBUG("\n");
444
445 mem = agp_allocate_memory(dev->agp->bridge, num_pages,
446 type);
447 if (mem == NULL) {
448 DRM_ERROR("Failed to allocate memory for %ld pages\n",
449 num_pages);
450 return NULL;
451 }
452
453 for (i = 0; i < num_pages; i++)
454 mem->pages[i] = pages[i];
455 mem->page_count = num_pages;
456
457 mem->is_flushed = true;
458 ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
459 if (ret != 0) {
460 DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
461 agp_free_memory(mem);
462 return NULL;
463 }
464
465 return mem;
466}
467EXPORT_SYMBOL(drm_agp_bind_pages);
468
469#endif /* __OS_HAS_AGP */
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 */
53int 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}
73EXPORT_SYMBOL(drm_agp_info);
74
75int drm_agp_info_ioctl(struct drm_device *dev, void *data,
76 struct drm_file *file_priv)
77{
78 struct drm_agp_info *info = data;
79 int err;
80
81 err = drm_agp_info(dev, info);
82 if (err)
83 return err;
84
85 return 0;
86}
87
88/**
89 * Acquire the AGP device.
90 *
91 * \param dev DRM device that is to acquire AGP.
92 * \return zero on success or a negative number on failure.
93 *
94 * Verifies the AGP device hasn't been acquired before and calls
95 * \c agp_backend_acquire.
96 */
97int drm_agp_acquire(struct drm_device *dev)
98{
99 if (!dev->agp)
100 return -ENODEV;
101 if (dev->agp->acquired)
102 return -EBUSY;
103 dev->agp->bridge = agp_backend_acquire(dev->pdev);
104 if (!dev->agp->bridge)
105 return -ENODEV;
106 dev->agp->acquired = 1;
107 return 0;
108}
109EXPORT_SYMBOL(drm_agp_acquire);
110
111/**
112 * Acquire the AGP device (ioctl).
113 *
114 * \param inode device inode.
115 * \param file_priv DRM file private.
116 * \param cmd command.
117 * \param arg user argument.
118 * \return zero on success or a negative number on failure.
119 *
120 * Verifies the AGP device hasn't been acquired before and calls
121 * \c agp_backend_acquire.
122 */
123int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
124 struct drm_file *file_priv)
125{
126 return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
127}
128
129/**
130 * Release the AGP device.
131 *
132 * \param dev DRM device that is to release AGP.
133 * \return zero on success or a negative number on failure.
134 *
135 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
136 */
137int drm_agp_release(struct drm_device *dev)
138{
139 if (!dev->agp || !dev->agp->acquired)
140 return -EINVAL;
141 agp_backend_release(dev->agp->bridge);
142 dev->agp->acquired = 0;
143 return 0;
144}
145EXPORT_SYMBOL(drm_agp_release);
146
147int drm_agp_release_ioctl(struct drm_device *dev, void *data,
148 struct drm_file *file_priv)
149{
150 return drm_agp_release(dev);
151}
152
153/**
154 * Enable the AGP bus.
155 *
156 * \param dev DRM device that has previously acquired AGP.
157 * \param mode Requested AGP mode.
158 * \return zero on success or a negative number on failure.
159 *
160 * Verifies the AGP device has been acquired but not enabled, and calls
161 * \c agp_enable.
162 */
163int drm_agp_enable(struct drm_device *dev, struct drm_agp_mode mode)
164{
165 if (!dev->agp || !dev->agp->acquired)
166 return -EINVAL;
167
168 dev->agp->mode = mode.mode;
169 agp_enable(dev->agp->bridge, mode.mode);
170 dev->agp->enabled = 1;
171 return 0;
172}
173EXPORT_SYMBOL(drm_agp_enable);
174
175int 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 agp_allocate_memory() and creates a drm_agp_mem entry for it.
194 */
195int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
196{
197 struct drm_agp_mem *entry;
198 struct agp_memory *memory;
199 unsigned long pages;
200 u32 type;
201
202 if (!dev->agp || !dev->agp->acquired)
203 return -EINVAL;
204 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
205 if (!entry)
206 return -ENOMEM;
207
208 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
209 type = (u32) request->type;
210 memory = agp_allocate_memory(dev->agp->bridge, pages, type);
211 if (!memory) {
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}
227EXPORT_SYMBOL(drm_agp_alloc);
228
229
230int 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 */
247static 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 */
271int 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 entry = drm_agp_lookup_entry(dev, request->handle);
279 if (!entry || !entry->bound)
280 return -EINVAL;
281 ret = drm_unbind_agp(entry->memory);
282 if (ret == 0)
283 entry->bound = 0;
284 return ret;
285}
286EXPORT_SYMBOL(drm_agp_unbind);
287
288
289int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
290 struct drm_file *file_priv)
291{
292 struct drm_agp_binding *request = data;
293
294 return drm_agp_unbind(dev, request);
295}
296
297/**
298 * Bind AGP memory into the GATT (ioctl)
299 *
300 * \param inode device inode.
301 * \param file_priv DRM file private.
302 * \param cmd command.
303 * \param arg pointer to a drm_agp_binding structure.
304 * \return zero on success or a negative number on failure.
305 *
306 * Verifies the AGP device is present and has been acquired and that no memory
307 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
308 * it to bind_agp() function.
309 */
310int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
311{
312 struct drm_agp_mem *entry;
313 int retcode;
314 int page;
315
316 if (!dev->agp || !dev->agp->acquired)
317 return -EINVAL;
318 entry = drm_agp_lookup_entry(dev, request->handle);
319 if (!entry || entry->bound)
320 return -EINVAL;
321 page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
322 retcode = drm_bind_agp(entry->memory, page);
323 if (retcode)
324 return retcode;
325 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
326 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
327 dev->agp->base, entry->bound);
328 return 0;
329}
330EXPORT_SYMBOL(drm_agp_bind);
331
332
333int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
334 struct drm_file *file_priv)
335{
336 struct drm_agp_binding *request = data;
337
338 return drm_agp_bind(dev, request);
339}
340
341/**
342 * Free AGP memory (ioctl).
343 *
344 * \param inode device inode.
345 * \param file_priv DRM file private.
346 * \param cmd command.
347 * \param arg pointer to a drm_agp_buffer structure.
348 * \return zero on success or a negative number on failure.
349 *
350 * Verifies the AGP device is present and has been acquired and looks up the
351 * AGP memory entry. If the memory it's currently bound, unbind it via
352 * unbind_agp(). Frees it via free_agp() as well as the entry itself
353 * and unlinks from the doubly linked list it's inserted in.
354 */
355int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
356{
357 struct drm_agp_mem *entry;
358
359 if (!dev->agp || !dev->agp->acquired)
360 return -EINVAL;
361 entry = drm_agp_lookup_entry(dev, request->handle);
362 if (!entry)
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}
373EXPORT_SYMBOL(drm_agp_free);
374
375
376int drm_agp_free_ioctl(struct drm_device *dev, void *data,
377 struct drm_file *file_priv)
378{
379 struct drm_agp_buffer *request = data;
380
381 return drm_agp_free(dev, request);
382}
383
384/**
385 * Initialize the AGP resources.
386 *
387 * \return pointer to a drm_agp_head structure.
388 *
389 * Gets the drm_agp_t structure which is made available by the agpgart module
390 * via the inter_module_* functions. Creates and initializes a drm_agp_head
391 * structure.
392 *
393 * Note that final cleanup of the kmalloced structure is directly done in
394 * drm_pci_agp_destroy.
395 */
396struct drm_agp_head *drm_agp_init(struct drm_device *dev)
397{
398 struct drm_agp_head *head = NULL;
399
400 head = kzalloc(sizeof(*head), GFP_KERNEL);
401 if (!head)
402 return NULL;
403 head->bridge = agp_find_bridge(dev->pdev);
404 if (!head->bridge) {
405 head->bridge = agp_backend_acquire(dev->pdev);
406 if (!head->bridge) {
407 kfree(head);
408 return NULL;
409 }
410 agp_copy_info(head->bridge, &head->agp_info);
411 agp_backend_release(head->bridge);
412 } else {
413 agp_copy_info(head->bridge, &head->agp_info);
414 }
415 if (head->agp_info.chipset == NOT_SUPPORTED) {
416 kfree(head);
417 return NULL;
418 }
419 INIT_LIST_HEAD(&head->memory);
420 head->cant_use_aperture = head->agp_info.cant_use_aperture;
421 head->page_mask = head->agp_info.page_mask;
422 head->base = head->agp_info.aper_base;
423 return head;
424}
425/* Only exported for i810.ko */
426EXPORT_SYMBOL(drm_agp_init);
427
428/**
429 * drm_legacy_agp_clear - Clear AGP resource list
430 * @dev: DRM device
431 *
432 * Iterate over all AGP resources and remove them. But keep the AGP head
433 * intact so it can still be used. It is safe to call this if AGP is disabled or
434 * was already removed.
435 *
436 * Cleanup is only done for drivers who have DRIVER_LEGACY set.
437 */
438void drm_legacy_agp_clear(struct drm_device *dev)
439{
440 struct drm_agp_mem *entry, *tempe;
441
442 if (!dev->agp)
443 return;
444 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
445 return;
446
447 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
448 if (entry->bound)
449 drm_unbind_agp(entry->memory);
450 drm_free_agp(entry->memory, entry->pages);
451 kfree(entry);
452 }
453 INIT_LIST_HEAD(&dev->agp->memory);
454
455 if (dev->agp->acquired)
456 drm_agp_release(dev);
457
458 dev->agp->acquired = 0;
459 dev->agp->enabled = 0;
460}
461
462/**
463 * Binds a collection of pages into AGP memory at the given offset, returning
464 * the AGP memory structure containing them.
465 *
466 * No reference is held on the pages during this time -- it is up to the
467 * caller to handle that.
468 */
469struct agp_memory *
470drm_agp_bind_pages(struct drm_device *dev,
471 struct page **pages,
472 unsigned long num_pages,
473 uint32_t gtt_offset,
474 u32 type)
475{
476 struct agp_memory *mem;
477 int ret, i;
478
479 DRM_DEBUG("\n");
480
481 mem = agp_allocate_memory(dev->agp->bridge, num_pages,
482 type);
483 if (mem == NULL) {
484 DRM_ERROR("Failed to allocate memory for %ld pages\n",
485 num_pages);
486 return NULL;
487 }
488
489 for (i = 0; i < num_pages; i++)
490 mem->pages[i] = pages[i];
491 mem->page_count = num_pages;
492
493 mem->is_flushed = true;
494 ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
495 if (ret != 0) {
496 DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
497 agp_free_memory(mem);
498 return NULL;
499 }
500
501 return mem;
502}
503EXPORT_SYMBOL(drm_agp_bind_pages);