2 * \file drm_agpsupport.h
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 filp file pointer.
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(drm_device_t * dev, drm_agp_info_t * 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 file *filp,
75 unsigned int cmd, unsigned long arg)
77 drm_file_t *priv = filp->private_data;
78 drm_device_t *dev = priv->head->dev;
82 err = drm_agp_info(dev, &info);
86 if (copy_to_user((drm_agp_info_t __user *) arg, &info, sizeof(info)))
92 * Acquire the AGP device.
94 * \param dev DRM device that is to acquire AGP
95 * \return zero on success or a negative number on failure.
97 * Verifies the AGP device hasn't been acquired before and calls
98 * \c agp_backend_acquire.
100 int drm_agp_acquire(drm_device_t * dev)
104 if (dev->agp->acquired)
106 if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
108 dev->agp->acquired = 1;
112 EXPORT_SYMBOL(drm_agp_acquire);
115 * Acquire the AGP device (ioctl).
117 * \param inode device inode.
118 * \param filp file pointer.
119 * \param cmd command.
120 * \param arg user argument.
121 * \return zero on success or a negative number on failure.
123 * Verifies the AGP device hasn't been acquired before and calls
124 * \c agp_backend_acquire.
126 int drm_agp_acquire_ioctl(struct inode *inode, struct file *filp,
127 unsigned int cmd, unsigned long arg)
129 drm_file_t *priv = filp->private_data;
131 return drm_agp_acquire((drm_device_t *) priv->head->dev);
135 * Release the AGP device.
137 * \param dev DRM device that is to release AGP
138 * \return zero on success or a negative number on failure.
140 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
142 int drm_agp_release(drm_device_t * dev)
144 if (!dev->agp || !dev->agp->acquired)
146 agp_backend_release(dev->agp->bridge);
147 dev->agp->acquired = 0;
151 EXPORT_SYMBOL(drm_agp_release);
153 int drm_agp_release_ioctl(struct inode *inode, struct file *filp,
154 unsigned int cmd, unsigned long arg)
156 drm_file_t *priv = filp->private_data;
157 drm_device_t *dev = priv->head->dev;
159 return drm_agp_release(dev);
163 * Enable the AGP bus.
165 * \param dev DRM device that has previously acquired AGP.
166 * \param mode Requested AGP mode.
167 * \return zero on success or a negative number on failure.
169 * Verifies the AGP device has been acquired but not enabled, and calls
172 int drm_agp_enable(drm_device_t * dev, drm_agp_mode_t mode)
174 if (!dev->agp || !dev->agp->acquired)
177 dev->agp->mode = mode.mode;
178 agp_enable(dev->agp->bridge, mode.mode);
179 dev->agp->base = dev->agp->agp_info.aper_base;
180 dev->agp->enabled = 1;
184 EXPORT_SYMBOL(drm_agp_enable);
186 int drm_agp_enable_ioctl(struct inode *inode, struct file *filp,
187 unsigned int cmd, unsigned long arg)
189 drm_file_t *priv = filp->private_data;
190 drm_device_t *dev = priv->head->dev;
193 if (copy_from_user(&mode, (drm_agp_mode_t __user *) arg, sizeof(mode)))
196 return drm_agp_enable(dev, mode);
200 * Allocate AGP memory.
202 * \param inode device inode.
203 * \param filp file pointer.
204 * \param cmd command.
205 * \param arg pointer to a drm_agp_buffer structure.
206 * \return zero on success or a negative number on failure.
208 * Verifies the AGP device is present and has been acquired, allocates the
209 * memory via alloc_agp() and creates a drm_agp_mem entry for it.
211 int drm_agp_alloc(struct inode *inode, struct file *filp,
212 unsigned int cmd, unsigned long arg)
214 drm_file_t *priv = filp->private_data;
215 drm_device_t *dev = priv->head->dev;
216 drm_agp_buffer_t request;
217 drm_agp_mem_t *entry;
221 drm_agp_buffer_t __user *argp = (void __user *)arg;
223 if (!dev->agp || !dev->agp->acquired)
225 if (copy_from_user(&request, argp, sizeof(request)))
227 if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
230 memset(entry, 0, sizeof(*entry));
232 pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
233 type = (u32) request.type;
235 if (!(memory = drm_alloc_agp(dev, pages, type))) {
236 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
240 entry->handle = (unsigned long)memory->key + 1;
241 entry->memory = memory;
243 entry->pages = pages;
245 entry->next = dev->agp->memory;
246 if (dev->agp->memory)
247 dev->agp->memory->prev = entry;
248 dev->agp->memory = entry;
250 request.handle = entry->handle;
251 request.physical = memory->physical;
253 if (copy_to_user(argp, &request, sizeof(request))) {
254 dev->agp->memory = entry->next;
255 dev->agp->memory->prev = NULL;
256 drm_free_agp(memory, pages);
257 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
264 * Search for the AGP memory entry associated with a handle.
266 * \param dev DRM device structure.
267 * \param handle AGP memory handle.
268 * \return pointer to the drm_agp_mem structure associated with \p handle.
270 * Walks through drm_agp_head::memory until finding a matching handle.
272 static drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t * dev,
273 unsigned long handle)
275 drm_agp_mem_t *entry;
277 for (entry = dev->agp->memory; entry; entry = entry->next) {
278 if (entry->handle == handle)
285 * Unbind AGP memory from the GATT (ioctl).
287 * \param inode device inode.
288 * \param filp file pointer.
289 * \param cmd command.
290 * \param arg pointer to a drm_agp_binding structure.
291 * \return zero on success or a negative number on failure.
293 * Verifies the AGP device is present and acquired, looks-up the AGP memory
294 * entry and passes it to the unbind_agp() function.
296 int drm_agp_unbind(struct inode *inode, struct file *filp,
297 unsigned int cmd, unsigned long arg)
299 drm_file_t *priv = filp->private_data;
300 drm_device_t *dev = priv->head->dev;
301 drm_agp_binding_t request;
302 drm_agp_mem_t *entry;
305 if (!dev->agp || !dev->agp->acquired)
308 (&request, (drm_agp_binding_t __user *) arg, sizeof(request)))
310 if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
314 ret = drm_unbind_agp(entry->memory);
321 * Bind AGP memory into the GATT (ioctl)
323 * \param inode device inode.
324 * \param filp file pointer.
325 * \param cmd command.
326 * \param arg pointer to a drm_agp_binding structure.
327 * \return zero on success or a negative number on failure.
329 * Verifies the AGP device is present and has been acquired and that no memory
330 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
331 * it to bind_agp() function.
333 int drm_agp_bind(struct inode *inode, struct file *filp,
334 unsigned int cmd, unsigned long arg)
336 drm_file_t *priv = filp->private_data;
337 drm_device_t *dev = priv->head->dev;
338 drm_agp_binding_t request;
339 drm_agp_mem_t *entry;
343 if (!dev->agp || !dev->agp->acquired)
346 (&request, (drm_agp_binding_t __user *) arg, sizeof(request)))
348 if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
352 page = (request.offset + PAGE_SIZE - 1) / PAGE_SIZE;
353 if ((retcode = drm_bind_agp(entry->memory, page)))
355 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
356 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
357 dev->agp->base, entry->bound);
362 * Free AGP memory (ioctl).
364 * \param inode device inode.
365 * \param filp file pointer.
366 * \param cmd command.
367 * \param arg pointer to a drm_agp_buffer structure.
368 * \return zero on success or a negative number on failure.
370 * Verifies the AGP device is present and has been acquired and looks up the
371 * AGP memory entry. If the memory it's currently bound, unbind it via
372 * unbind_agp(). Frees it via free_agp() as well as the entry itself
373 * and unlinks from the doubly linked list it's inserted in.
375 int drm_agp_free(struct inode *inode, struct file *filp,
376 unsigned int cmd, unsigned long arg)
378 drm_file_t *priv = filp->private_data;
379 drm_device_t *dev = priv->head->dev;
380 drm_agp_buffer_t request;
381 drm_agp_mem_t *entry;
383 if (!dev->agp || !dev->agp->acquired)
386 (&request, (drm_agp_buffer_t __user *) arg, sizeof(request)))
388 if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
391 drm_unbind_agp(entry->memory);
394 entry->prev->next = entry->next;
396 dev->agp->memory = entry->next;
399 entry->next->prev = entry->prev;
401 drm_free_agp(entry->memory, entry->pages);
402 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
407 * Initialize the AGP resources.
409 * \return pointer to a drm_agp_head structure.
412 drm_agp_head_t *drm_agp_init(drm_device_t * dev)
414 drm_agp_head_t *head = NULL;
416 if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
418 memset((void *)head, 0, sizeof(*head));
419 head->bridge = agp_find_bridge(dev->pdev);
421 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
422 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
425 agp_copy_info(head->bridge, &head->agp_info);
426 agp_backend_release(head->bridge);
428 agp_copy_info(head->bridge, &head->agp_info);
430 if (head->agp_info.chipset == NOT_SUPPORTED) {
431 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
435 head->cant_use_aperture = head->agp_info.cant_use_aperture;
436 head->page_mask = head->agp_info.page_mask;
441 /** Calls agp_allocate_memory() */
442 DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
443 size_t pages, u32 type)
445 return agp_allocate_memory(bridge, pages, type);
448 /** Calls agp_free_memory() */
449 int drm_agp_free_memory(DRM_AGP_MEM * handle)
453 agp_free_memory(handle);
457 /** Calls agp_bind_memory() */
458 int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
462 return agp_bind_memory(handle, start);
465 EXPORT_SYMBOL(drm_agp_bind_memory);
467 /** Calls agp_unbind_memory() */
468 int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
472 return agp_unbind_memory(handle);
475 #endif /* __OS_HAS_AGP */