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