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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
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 */
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#if IS_ENABLED(CONFIG_AGP)
39#include <asm/agp.h>
40#endif
41
42#include <drm/drm_device.h>
43#include <drm/drm_drv.h>
44#include <drm/drm_file.h>
45#include <drm/drm_print.h>
46
47#include "drm_legacy.h"
48
49#if IS_ENABLED(CONFIG_AGP)
50
51/*
52 * Get AGP information.
53 *
54 * \return zero on success or a negative number on failure.
55 *
56 * Verifies the AGP device has been initialized and acquired and fills in the
57 * drm_agp_info structure with the information in drm_agp_head::agp_info.
58 */
59int drm_legacy_agp_info(struct drm_device *dev, struct drm_agp_info *info)
60{
61 struct agp_kern_info *kern;
62
63 if (!dev->agp || !dev->agp->acquired)
64 return -EINVAL;
65
66 kern = &dev->agp->agp_info;
67 info->agp_version_major = kern->version.major;
68 info->agp_version_minor = kern->version.minor;
69 info->mode = kern->mode;
70 info->aperture_base = kern->aper_base;
71 info->aperture_size = kern->aper_size * 1024 * 1024;
72 info->memory_allowed = kern->max_memory << PAGE_SHIFT;
73 info->memory_used = kern->current_memory << PAGE_SHIFT;
74 info->id_vendor = kern->device->vendor;
75 info->id_device = kern->device->device;
76
77 return 0;
78}
79EXPORT_SYMBOL(drm_legacy_agp_info);
80
81int drm_legacy_agp_info_ioctl(struct drm_device *dev, void *data,
82 struct drm_file *file_priv)
83{
84 struct drm_agp_info *info = data;
85 int err;
86
87 err = drm_legacy_agp_info(dev, info);
88 if (err)
89 return err;
90
91 return 0;
92}
93
94/*
95 * Acquire the AGP device.
96 *
97 * \param dev DRM device that is to acquire AGP.
98 * \return zero on success or a negative number on failure.
99 *
100 * Verifies the AGP device hasn't been acquired before and calls
101 * \c agp_backend_acquire.
102 */
103int drm_legacy_agp_acquire(struct drm_device *dev)
104{
105 struct pci_dev *pdev = to_pci_dev(dev->dev);
106
107 if (!dev->agp)
108 return -ENODEV;
109 if (dev->agp->acquired)
110 return -EBUSY;
111 dev->agp->bridge = agp_backend_acquire(pdev);
112 if (!dev->agp->bridge)
113 return -ENODEV;
114 dev->agp->acquired = 1;
115 return 0;
116}
117EXPORT_SYMBOL(drm_legacy_agp_acquire);
118
119/*
120 * Acquire the AGP device (ioctl).
121 *
122 * \return zero on success or a negative number on failure.
123 *
124 * Verifies the AGP device hasn't been acquired before and calls
125 * \c agp_backend_acquire.
126 */
127int drm_legacy_agp_acquire_ioctl(struct drm_device *dev, void *data,
128 struct drm_file *file_priv)
129{
130 return drm_legacy_agp_acquire((struct drm_device *)file_priv->minor->dev);
131}
132
133/*
134 * Release the AGP device.
135 *
136 * \param dev DRM device that is to release AGP.
137 * \return zero on success or a negative number on failure.
138 *
139 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
140 */
141int drm_legacy_agp_release(struct drm_device *dev)
142{
143 if (!dev->agp || !dev->agp->acquired)
144 return -EINVAL;
145 agp_backend_release(dev->agp->bridge);
146 dev->agp->acquired = 0;
147 return 0;
148}
149EXPORT_SYMBOL(drm_legacy_agp_release);
150
151int drm_legacy_agp_release_ioctl(struct drm_device *dev, void *data,
152 struct drm_file *file_priv)
153{
154 return drm_legacy_agp_release(dev);
155}
156
157/*
158 * Enable the AGP bus.
159 *
160 * \param dev DRM device that has previously acquired AGP.
161 * \param mode Requested AGP mode.
162 * \return zero on success or a negative number on failure.
163 *
164 * Verifies the AGP device has been acquired but not enabled, and calls
165 * \c agp_enable.
166 */
167int drm_legacy_agp_enable(struct drm_device *dev, struct drm_agp_mode mode)
168{
169 if (!dev->agp || !dev->agp->acquired)
170 return -EINVAL;
171
172 dev->agp->mode = mode.mode;
173 agp_enable(dev->agp->bridge, mode.mode);
174 dev->agp->enabled = 1;
175 return 0;
176}
177EXPORT_SYMBOL(drm_legacy_agp_enable);
178
179int drm_legacy_agp_enable_ioctl(struct drm_device *dev, void *data,
180 struct drm_file *file_priv)
181{
182 struct drm_agp_mode *mode = data;
183
184 return drm_legacy_agp_enable(dev, *mode);
185}
186
187/*
188 * Allocate AGP memory.
189 *
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_legacy_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 = DIV_ROUND_UP(request->size, 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_legacy_agp_alloc);
228
229
230int drm_legacy_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_legacy_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_legacy_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 * \return zero on success or a negative number on failure.
263 *
264 * Verifies the AGP device is present and acquired, looks-up the AGP memory
265 * entry and passes it to the unbind_agp() function.
266 */
267int drm_legacy_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
268{
269 struct drm_agp_mem *entry;
270 int ret;
271
272 if (!dev->agp || !dev->agp->acquired)
273 return -EINVAL;
274 entry = drm_legacy_agp_lookup_entry(dev, request->handle);
275 if (!entry || !entry->bound)
276 return -EINVAL;
277 ret = agp_unbind_memory(entry->memory);
278 if (ret == 0)
279 entry->bound = 0;
280 return ret;
281}
282EXPORT_SYMBOL(drm_legacy_agp_unbind);
283
284
285int drm_legacy_agp_unbind_ioctl(struct drm_device *dev, void *data,
286 struct drm_file *file_priv)
287{
288 struct drm_agp_binding *request = data;
289
290 return drm_legacy_agp_unbind(dev, request);
291}
292
293/*
294 * Bind AGP memory into the GATT (ioctl)
295 *
296 * \return zero on success or a negative number on failure.
297 *
298 * Verifies the AGP device is present and has been acquired and that no memory
299 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
300 * it to bind_agp() function.
301 */
302int drm_legacy_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
303{
304 struct drm_agp_mem *entry;
305 int retcode;
306 int page;
307
308 if (!dev->agp || !dev->agp->acquired)
309 return -EINVAL;
310 entry = drm_legacy_agp_lookup_entry(dev, request->handle);
311 if (!entry || entry->bound)
312 return -EINVAL;
313 page = DIV_ROUND_UP(request->offset, PAGE_SIZE);
314 retcode = agp_bind_memory(entry->memory, page);
315 if (retcode)
316 return retcode;
317 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
318 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
319 dev->agp->base, entry->bound);
320 return 0;
321}
322EXPORT_SYMBOL(drm_legacy_agp_bind);
323
324
325int drm_legacy_agp_bind_ioctl(struct drm_device *dev, void *data,
326 struct drm_file *file_priv)
327{
328 struct drm_agp_binding *request = data;
329
330 return drm_legacy_agp_bind(dev, request);
331}
332
333/*
334 * Free AGP memory (ioctl).
335 *
336 * \return zero on success or a negative number on failure.
337 *
338 * Verifies the AGP device is present and has been acquired and looks up the
339 * AGP memory entry. If the memory is currently bound, unbind it via
340 * unbind_agp(). Frees it via free_agp() as well as the entry itself
341 * and unlinks from the doubly linked list it's inserted in.
342 */
343int drm_legacy_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
344{
345 struct drm_agp_mem *entry;
346
347 if (!dev->agp || !dev->agp->acquired)
348 return -EINVAL;
349 entry = drm_legacy_agp_lookup_entry(dev, request->handle);
350 if (!entry)
351 return -EINVAL;
352 if (entry->bound)
353 agp_unbind_memory(entry->memory);
354
355 list_del(&entry->head);
356
357 agp_free_memory(entry->memory);
358 kfree(entry);
359 return 0;
360}
361EXPORT_SYMBOL(drm_legacy_agp_free);
362
363
364int drm_legacy_agp_free_ioctl(struct drm_device *dev, void *data,
365 struct drm_file *file_priv)
366{
367 struct drm_agp_buffer *request = data;
368
369 return drm_legacy_agp_free(dev, request);
370}
371
372/*
373 * Initialize the AGP resources.
374 *
375 * \return pointer to a drm_agp_head structure.
376 *
377 * Gets the drm_agp_t structure which is made available by the agpgart module
378 * via the inter_module_* functions. Creates and initializes a drm_agp_head
379 * structure.
380 *
381 * Note that final cleanup of the kmalloced structure is directly done in
382 * drm_pci_agp_destroy.
383 */
384struct drm_agp_head *drm_legacy_agp_init(struct drm_device *dev)
385{
386 struct pci_dev *pdev = to_pci_dev(dev->dev);
387 struct drm_agp_head *head = NULL;
388
389 head = kzalloc(sizeof(*head), GFP_KERNEL);
390 if (!head)
391 return NULL;
392 head->bridge = agp_find_bridge(pdev);
393 if (!head->bridge) {
394 head->bridge = agp_backend_acquire(pdev);
395 if (!head->bridge) {
396 kfree(head);
397 return NULL;
398 }
399 agp_copy_info(head->bridge, &head->agp_info);
400 agp_backend_release(head->bridge);
401 } else {
402 agp_copy_info(head->bridge, &head->agp_info);
403 }
404 if (head->agp_info.chipset == NOT_SUPPORTED) {
405 kfree(head);
406 return NULL;
407 }
408 INIT_LIST_HEAD(&head->memory);
409 head->cant_use_aperture = head->agp_info.cant_use_aperture;
410 head->page_mask = head->agp_info.page_mask;
411 head->base = head->agp_info.aper_base;
412 return head;
413}
414/* Only exported for i810.ko */
415EXPORT_SYMBOL(drm_legacy_agp_init);
416
417/**
418 * drm_legacy_agp_clear - Clear AGP resource list
419 * @dev: DRM device
420 *
421 * Iterate over all AGP resources and remove them. But keep the AGP head
422 * intact so it can still be used. It is safe to call this if AGP is disabled or
423 * was already removed.
424 *
425 * Cleanup is only done for drivers who have DRIVER_LEGACY set.
426 */
427void drm_legacy_agp_clear(struct drm_device *dev)
428{
429 struct drm_agp_mem *entry, *tempe;
430
431 if (!dev->agp)
432 return;
433 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
434 return;
435
436 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
437 if (entry->bound)
438 agp_unbind_memory(entry->memory);
439 agp_free_memory(entry->memory);
440 kfree(entry);
441 }
442 INIT_LIST_HEAD(&dev->agp->memory);
443
444 if (dev->agp->acquired)
445 drm_legacy_agp_release(dev);
446
447 dev->agp->acquired = 0;
448 dev->agp->enabled = 0;
449}
450
451#endif