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(size: 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(objp: 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(new: &entry->head, 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, handle: 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, handle: 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, handle: request->handle);
350 if (!entry)
351 return -EINVAL;
352 if (entry->bound)
353 agp_unbind_memory(entry->memory);
354
355 list_del(entry: &entry->head);
356
357 agp_free_memory(entry->memory);
358 kfree(objp: 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(size: 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(objp: 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(objp: head);
406 return NULL;
407 }
408 INIT_LIST_HEAD(list: &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, feature: 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(objp: entry);
441 }
442 INIT_LIST_HEAD(list: &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
452

source code of linux/drivers/gpu/drm/drm_agpsupport.c