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 | */ |
59 | int 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 | } |
79 | EXPORT_SYMBOL(drm_legacy_agp_info); |
80 | |
81 | int 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 | */ |
103 | int 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 | } |
117 | EXPORT_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 | */ |
127 | int 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 | */ |
141 | int 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 | } |
149 | EXPORT_SYMBOL(drm_legacy_agp_release); |
150 | |
151 | int 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 | */ |
167 | int 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 | } |
177 | EXPORT_SYMBOL(drm_legacy_agp_enable); |
178 | |
179 | int 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 | */ |
195 | int 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 | } |
227 | EXPORT_SYMBOL(drm_legacy_agp_alloc); |
228 | |
229 | |
230 | int 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 | */ |
247 | static 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 | */ |
267 | int 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 | } |
282 | EXPORT_SYMBOL(drm_legacy_agp_unbind); |
283 | |
284 | |
285 | int 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 | */ |
302 | int 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 | } |
322 | EXPORT_SYMBOL(drm_legacy_agp_bind); |
323 | |
324 | |
325 | int 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 | */ |
343 | int 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 | } |
361 | EXPORT_SYMBOL(drm_legacy_agp_free); |
362 | |
363 | |
364 | int 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 | */ |
384 | struct 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 */ |
415 | EXPORT_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 | */ |
427 | void 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 | |