2 * \file drm_agpsupport.c
3 * DRM support for AGP/GART backend
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
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:
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
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.
35 #include <linux/module.h>
40 * Get AGP information.
42 * \param inode device inode.
43 * \param file_priv DRM file private.
45 * \param arg pointer to a (output) drm_agp_info structure.
46 * \return zero on success or a negative number on failure.
48 * Verifies the AGP device has been initialized and acquired and fills in the
49 * drm_agp_info structure with the information in drm_agp_head::agp_info.
51 int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
55 if (!dev->agp || !dev->agp->acquired)
58 kern = &dev->agp->agp_info;
59 info->agp_version_major = kern->version.major;
60 info->agp_version_minor = kern->version.minor;
61 info->mode = kern->mode;
62 info->aperture_base = kern->aper_base;
63 info->aperture_size = kern->aper_size * 1024 * 1024;
64 info->memory_allowed = kern->max_memory << PAGE_SHIFT;
65 info->memory_used = kern->current_memory << PAGE_SHIFT;
66 info->id_vendor = kern->device->vendor;
67 info->id_device = kern->device->device;
72 EXPORT_SYMBOL(drm_agp_info);
74 int drm_agp_info_ioctl(struct inode *inode, struct drm_file *file_priv,
75 unsigned int cmd, unsigned long arg)
77 struct drm_device *dev = file_priv->head->dev;
78 struct drm_agp_info info;
81 err = drm_agp_info(dev, &info);
85 if (copy_to_user((struct drm_agp_info __user *) arg, &info, sizeof(info)))
91 * Acquire the AGP device.
93 * \param dev DRM device that is to acquire AGP.
94 * \return zero on success or a negative number on failure.
96 * Verifies the AGP device hasn't been acquired before and calls
97 * \c agp_backend_acquire.
99 int drm_agp_acquire(struct drm_device * dev)
103 if (dev->agp->acquired)
105 if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
107 dev->agp->acquired = 1;
111 EXPORT_SYMBOL(drm_agp_acquire);
114 * Acquire the AGP device (ioctl).
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.
122 * Verifies the AGP device hasn't been acquired before and calls
123 * \c agp_backend_acquire.
125 int drm_agp_acquire_ioctl(struct inode *inode, struct drm_file *file_priv,
126 unsigned int cmd, unsigned long arg)
128 return drm_agp_acquire((struct drm_device *) file_priv->head->dev);
132 * Release the AGP device.
134 * \param dev DRM device that is to release AGP.
135 * \return zero on success or a negative number on failure.
137 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
139 int drm_agp_release(struct drm_device * dev)
141 if (!dev->agp || !dev->agp->acquired)
143 agp_backend_release(dev->agp->bridge);
144 dev->agp->acquired = 0;
147 EXPORT_SYMBOL(drm_agp_release);
149 int drm_agp_release_ioctl(struct inode *inode, struct drm_file *file_priv,
150 unsigned int cmd, unsigned long arg)
152 struct drm_device *dev = file_priv->head->dev;
154 return drm_agp_release(dev);
158 * Enable the AGP bus.
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.
164 * Verifies the AGP device has been acquired but not enabled, and calls
167 int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
169 if (!dev->agp || !dev->agp->acquired)
172 dev->agp->mode = mode.mode;
173 agp_enable(dev->agp->bridge, mode.mode);
174 dev->agp->base = dev->agp->agp_info.aper_base;
175 dev->agp->enabled = 1;
179 EXPORT_SYMBOL(drm_agp_enable);
181 int drm_agp_enable_ioctl(struct inode *inode, struct drm_file *file_priv,
182 unsigned int cmd, unsigned long arg)
184 struct drm_device *dev = file_priv->head->dev;
185 struct drm_agp_mode mode;
187 if (copy_from_user(&mode, (struct drm_agp_mode __user *) arg, sizeof(mode)))
190 return drm_agp_enable(dev, mode);
194 * Allocate AGP memory.
196 * \param inode device inode.
197 * \param file_priv file private pointer.
198 * \param cmd command.
199 * \param arg pointer to a drm_agp_buffer structure.
200 * \return zero on success or a negative number on failure.
202 * Verifies the AGP device is present and has been acquired, allocates the
203 * memory via alloc_agp() and creates a drm_agp_mem entry for it.
205 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
207 struct drm_agp_mem *entry;
212 if (!dev->agp || !dev->agp->acquired)
214 if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
217 memset(entry, 0, sizeof(*entry));
219 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
220 type = (u32) request->type;
221 if (!(memory = drm_alloc_agp(dev, pages, type))) {
222 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
226 entry->handle = (unsigned long)memory->key + 1;
227 entry->memory = memory;
229 entry->pages = pages;
230 list_add(&entry->head, &dev->agp->memory);
232 request->handle = entry->handle;
233 request->physical = memory->physical;
237 EXPORT_SYMBOL(drm_agp_alloc);
239 int drm_agp_alloc_ioctl(struct inode *inode, struct drm_file *file_priv,
240 unsigned int cmd, unsigned long arg)
242 struct drm_device *dev = file_priv->head->dev;
243 struct drm_agp_buffer request;
244 struct drm_agp_buffer __user *argp = (void __user *)arg;
247 if (copy_from_user(&request, argp, sizeof(request)))
250 err = drm_agp_alloc(dev, &request);
254 if (copy_to_user(argp, &request, sizeof(request))) {
255 struct drm_agp_mem *entry;
256 list_for_each_entry(entry, &dev->agp->memory, head) {
257 if (entry->handle == request.handle)
260 list_del(&entry->head);
261 drm_free_agp(entry->memory, entry->pages);
262 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
270 * Search for the AGP memory entry associated with a handle.
272 * \param dev DRM device structure.
273 * \param handle AGP memory handle.
274 * \return pointer to the drm_agp_mem structure associated with \p handle.
276 * Walks through drm_agp_head::memory until finding a matching handle.
278 static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
279 unsigned long handle)
281 struct drm_agp_mem *entry;
283 list_for_each_entry(entry, &dev->agp->memory, head) {
284 if (entry->handle == handle)
291 * Unbind AGP memory from the GATT (ioctl).
293 * \param inode device inode.
294 * \param file_priv DRM file private.
295 * \param cmd command.
296 * \param arg pointer to a drm_agp_binding structure.
297 * \return zero on success or a negative number on failure.
299 * Verifies the AGP device is present and acquired, looks-up the AGP memory
300 * entry and passes it to the unbind_agp() function.
302 int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
304 struct drm_agp_mem *entry;
307 if (!dev->agp || !dev->agp->acquired)
309 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
313 ret = drm_unbind_agp(entry->memory);
318 EXPORT_SYMBOL(drm_agp_unbind);
320 int drm_agp_unbind_ioctl(struct inode *inode, struct drm_file *file_priv,
321 unsigned int cmd, unsigned long arg)
323 struct drm_device *dev = file_priv->head->dev;
324 struct drm_agp_binding request;
327 (&request, (struct drm_agp_binding __user *) arg, sizeof(request)))
330 return drm_agp_unbind(dev, &request);
334 * Bind AGP memory into the GATT (ioctl)
336 * \param inode device inode.
337 * \param file_priv DRM file private.
338 * \param cmd command.
339 * \param arg pointer to a drm_agp_binding structure.
340 * \return zero on success or a negative number on failure.
342 * Verifies the AGP device is present and has been acquired and that no memory
343 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
344 * it to bind_agp() function.
346 int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
348 struct drm_agp_mem *entry;
352 if (!dev->agp || !dev->agp->acquired)
354 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
358 page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
359 if ((retcode = drm_bind_agp(entry->memory, page)))
361 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
362 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
363 dev->agp->base, entry->bound);
366 EXPORT_SYMBOL(drm_agp_bind);
368 int drm_agp_bind_ioctl(struct inode *inode, struct drm_file *file_priv,
369 unsigned int cmd, unsigned long arg)
371 struct drm_device *dev = file_priv->head->dev;
372 struct drm_agp_binding request;
375 (&request, (struct drm_agp_binding __user *) arg, sizeof(request)))
378 return drm_agp_bind(dev, &request);
382 * Free AGP memory (ioctl).
384 * \param inode device inode.
385 * \param file_priv DRM file private.
386 * \param cmd command.
387 * \param arg pointer to a drm_agp_buffer structure.
388 * \return zero on success or a negative number on failure.
390 * Verifies the AGP device is present and has been acquired and looks up the
391 * AGP memory entry. If the memory it's currently bound, unbind it via
392 * unbind_agp(). Frees it via free_agp() as well as the entry itself
393 * and unlinks from the doubly linked list it's inserted in.
395 int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
397 struct drm_agp_mem *entry;
399 if (!dev->agp || !dev->agp->acquired)
401 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
404 drm_unbind_agp(entry->memory);
406 list_del(&entry->head);
408 drm_free_agp(entry->memory, entry->pages);
409 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
412 EXPORT_SYMBOL(drm_agp_free);
414 int drm_agp_free_ioctl(struct inode *inode, struct drm_file *file_priv,
415 unsigned int cmd, unsigned long arg)
417 struct drm_device *dev = file_priv->head->dev;
418 struct drm_agp_buffer request;
421 (&request, (struct drm_agp_buffer __user *) arg, sizeof(request)))
424 return drm_agp_free(dev, &request);
428 * Initialize the AGP resources.
430 * \return pointer to a drm_agp_head structure.
432 * Gets the drm_agp_t structure which is made available by the agpgart module
433 * via the inter_module_* functions. Creates and initializes a drm_agp_head
436 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
438 struct drm_agp_head *head = NULL;
440 if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
442 memset((void *)head, 0, sizeof(*head));
443 head->bridge = agp_find_bridge(dev->pdev);
445 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
446 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
449 agp_copy_info(head->bridge, &head->agp_info);
450 agp_backend_release(head->bridge);
452 agp_copy_info(head->bridge, &head->agp_info);
454 if (head->agp_info.chipset == NOT_SUPPORTED) {
455 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
458 INIT_LIST_HEAD(&head->memory);
459 head->cant_use_aperture = head->agp_info.cant_use_aperture;
460 head->page_mask = head->agp_info.page_mask;
465 /** Calls agp_allocate_memory() */
466 DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
467 size_t pages, u32 type)
469 return agp_allocate_memory(bridge, pages, type);
472 /** Calls agp_free_memory() */
473 int drm_agp_free_memory(DRM_AGP_MEM * handle)
477 agp_free_memory(handle);
481 /** Calls agp_bind_memory() */
482 int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
486 return agp_bind_memory(handle, start);
489 /** Calls agp_unbind_memory() */
490 int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
494 return agp_unbind_memory(handle);
497 #endif /* __OS_HAS_AGP */