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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 <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