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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 <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}
73
74EXPORT_SYMBOL(drm_agp_info);
75
76int 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 */
98int 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
110EXPORT_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 */
124int 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 */
138int 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}
146EXPORT_SYMBOL(drm_agp_release);
147
148int 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 */
164int 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
175EXPORT_SYMBOL(drm_agp_enable);
176
177int 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 */
197int 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}
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 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}
287EXPORT_SYMBOL(drm_agp_unbind);
288
289
290int 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 */
311int 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}
331EXPORT_SYMBOL(drm_agp_bind);
332
333
334int 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 */
356int 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}
373EXPORT_SYMBOL(drm_agp_free);
374
375
376
377int 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 */
397struct 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 */
437void 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 */
468struct agp_memory *
469drm_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}
502EXPORT_SYMBOL(drm_agp_bind_pages);
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
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 struct agp_kern_info *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 struct agp_memory *memory;
202 unsigned long pages;
203 u32 type;
204
205 if (!dev->agp || !dev->agp->acquired)
206 return -EINVAL;
207 if (!(entry = kzalloc(sizeof(*entry), GFP_KERNEL)))
208 return -ENOMEM;
209
210 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
211 type = (u32) request->type;
212 if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) {
213 kfree(entry);
214 return -ENOMEM;
215 }
216
217 entry->handle = (unsigned long)memory->key + 1;
218 entry->memory = memory;
219 entry->bound = 0;
220 entry->pages = pages;
221 list_add(&entry->head, &dev->agp->memory);
222
223 request->handle = entry->handle;
224 request->physical = memory->physical;
225
226 return 0;
227}
228EXPORT_SYMBOL(drm_agp_alloc);
229
230
231int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
232 struct drm_file *file_priv)
233{
234 struct drm_agp_buffer *request = data;
235
236 return drm_agp_alloc(dev, request);
237}
238
239/**
240 * Search for the AGP memory entry associated with a handle.
241 *
242 * \param dev DRM device structure.
243 * \param handle AGP memory handle.
244 * \return pointer to the drm_agp_mem structure associated with \p handle.
245 *
246 * Walks through drm_agp_head::memory until finding a matching handle.
247 */
248static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
249 unsigned long handle)
250{
251 struct drm_agp_mem *entry;
252
253 list_for_each_entry(entry, &dev->agp->memory, head) {
254 if (entry->handle == handle)
255 return entry;
256 }
257 return NULL;
258}
259
260/**
261 * Unbind AGP memory from the GATT (ioctl).
262 *
263 * \param inode device inode.
264 * \param file_priv DRM file private.
265 * \param cmd command.
266 * \param arg pointer to a drm_agp_binding structure.
267 * \return zero on success or a negative number on failure.
268 *
269 * Verifies the AGP device is present and acquired, looks-up the AGP memory
270 * entry and passes it to the unbind_agp() function.
271 */
272int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
273{
274 struct drm_agp_mem *entry;
275 int ret;
276
277 if (!dev->agp || !dev->agp->acquired)
278 return -EINVAL;
279 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
280 return -EINVAL;
281 if (!entry->bound)
282 return -EINVAL;
283 ret = drm_unbind_agp(entry->memory);
284 if (ret == 0)
285 entry->bound = 0;
286 return ret;
287}
288EXPORT_SYMBOL(drm_agp_unbind);
289
290
291int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
292 struct drm_file *file_priv)
293{
294 struct drm_agp_binding *request = data;
295
296 return drm_agp_unbind(dev, request);
297}
298
299/**
300 * Bind AGP memory into the GATT (ioctl)
301 *
302 * \param inode device inode.
303 * \param file_priv DRM file private.
304 * \param cmd command.
305 * \param arg pointer to a drm_agp_binding structure.
306 * \return zero on success or a negative number on failure.
307 *
308 * Verifies the AGP device is present and has been acquired and that no memory
309 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
310 * it to bind_agp() function.
311 */
312int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
313{
314 struct drm_agp_mem *entry;
315 int retcode;
316 int page;
317
318 if (!dev->agp || !dev->agp->acquired)
319 return -EINVAL;
320 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
321 return -EINVAL;
322 if (entry->bound)
323 return -EINVAL;
324 page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
325 if ((retcode = drm_bind_agp(entry->memory, page)))
326 return retcode;
327 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
328 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
329 dev->agp->base, entry->bound);
330 return 0;
331}
332EXPORT_SYMBOL(drm_agp_bind);
333
334
335int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
336 struct drm_file *file_priv)
337{
338 struct drm_agp_binding *request = data;
339
340 return drm_agp_bind(dev, request);
341}
342
343/**
344 * Free AGP memory (ioctl).
345 *
346 * \param inode device inode.
347 * \param file_priv DRM file private.
348 * \param cmd command.
349 * \param arg pointer to a drm_agp_buffer structure.
350 * \return zero on success or a negative number on failure.
351 *
352 * Verifies the AGP device is present and has been acquired and looks up the
353 * AGP memory entry. If the memory it's currently bound, unbind it via
354 * unbind_agp(). Frees it via free_agp() as well as the entry itself
355 * and unlinks from the doubly linked list it's inserted in.
356 */
357int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
358{
359 struct drm_agp_mem *entry;
360
361 if (!dev->agp || !dev->agp->acquired)
362 return -EINVAL;
363 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
364 return -EINVAL;
365 if (entry->bound)
366 drm_unbind_agp(entry->memory);
367
368 list_del(&entry->head);
369
370 drm_free_agp(entry->memory, entry->pages);
371 kfree(entry);
372 return 0;
373}
374EXPORT_SYMBOL(drm_agp_free);
375
376
377
378int drm_agp_free_ioctl(struct drm_device *dev, void *data,
379 struct drm_file *file_priv)
380{
381 struct drm_agp_buffer *request = data;
382
383 return drm_agp_free(dev, request);
384}
385
386/**
387 * Initialize the AGP resources.
388 *
389 * \return pointer to a drm_agp_head structure.
390 *
391 * Gets the drm_agp_t structure which is made available by the agpgart module
392 * via the inter_module_* functions. Creates and initializes a drm_agp_head
393 * structure.
394 *
395 * Note that final cleanup of the kmalloced structure is directly done in
396 * drm_pci_agp_destroy.
397 */
398struct drm_agp_head *drm_agp_init(struct drm_device *dev)
399{
400 struct drm_agp_head *head = NULL;
401
402 if (!(head = kzalloc(sizeof(*head), GFP_KERNEL)))
403 return NULL;
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 * drm_agp_clear - Clear AGP resource list
428 * @dev: DRM device
429 *
430 * Iterate over all AGP resources and remove them. But keep the AGP head
431 * intact so it can still be used. It is safe to call this if AGP is disabled or
432 * was already removed.
433 *
434 * If DRIVER_MODESET is active, nothing is done to protect the modesetting
435 * resources from getting destroyed. Drivers are responsible of cleaning them up
436 * during device shutdown.
437 */
438void drm_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_MODESET))
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);
504
505#endif /* __OS_HAS_AGP */