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>
36 #include <linux/slab.h>
43 * Get AGP information.
45 * \param inode device inode.
46 * \param file_priv DRM file private.
48 * \param arg pointer to a (output) drm_agp_info structure.
49 * \return zero on success or a negative number on failure.
51 * Verifies the AGP device has been initialized and acquired and fills in the
52 * drm_agp_info structure with the information in drm_agp_head::agp_info.
54 int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
58 if (!dev->agp || !dev->agp->acquired)
61 kern = &dev->agp->agp_info;
62 info->agp_version_major = kern->version.major;
63 info->agp_version_minor = kern->version.minor;
64 info->mode = kern->mode;
65 info->aperture_base = kern->aper_base;
66 info->aperture_size = kern->aper_size * 1024 * 1024;
67 info->memory_allowed = kern->max_memory << PAGE_SHIFT;
68 info->memory_used = kern->current_memory << PAGE_SHIFT;
69 info->id_vendor = kern->device->vendor;
70 info->id_device = kern->device->device;
75 EXPORT_SYMBOL(drm_agp_info);
77 int drm_agp_info_ioctl(struct drm_device *dev, void *data,
78 struct drm_file *file_priv)
80 struct drm_agp_info *info = data;
83 err = drm_agp_info(dev, 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 drm_device *dev, void *data,
126 struct drm_file *file_priv)
128 return drm_agp_acquire((struct drm_device *) file_priv->minor->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 drm_device *dev, void *data,
150 struct drm_file *file_priv)
152 return drm_agp_release(dev);
156 * Enable the AGP bus.
158 * \param dev DRM device that has previously acquired AGP.
159 * \param mode Requested AGP mode.
160 * \return zero on success or a negative number on failure.
162 * Verifies the AGP device has been acquired but not enabled, and calls
165 int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
167 if (!dev->agp || !dev->agp->acquired)
170 dev->agp->mode = mode.mode;
171 agp_enable(dev->agp->bridge, mode.mode);
172 dev->agp->enabled = 1;
176 EXPORT_SYMBOL(drm_agp_enable);
178 int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
179 struct drm_file *file_priv)
181 struct drm_agp_mode *mode = data;
183 return drm_agp_enable(dev, *mode);
187 * Allocate AGP memory.
189 * \param inode device inode.
190 * \param file_priv file private pointer.
191 * \param cmd command.
192 * \param arg pointer to a drm_agp_buffer structure.
193 * \return zero on success or a negative number on failure.
195 * Verifies the AGP device is present and has been acquired, allocates the
196 * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
198 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
200 struct drm_agp_mem *entry;
205 if (!dev->agp || !dev->agp->acquired)
207 if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL)))
210 memset(entry, 0, sizeof(*entry));
212 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
213 type = (u32) request->type;
214 if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) {
219 entry->handle = (unsigned long)memory->key + 1;
220 entry->memory = memory;
222 entry->pages = pages;
223 list_add(&entry->head, &dev->agp->memory);
225 request->handle = entry->handle;
226 request->physical = memory->physical;
230 EXPORT_SYMBOL(drm_agp_alloc);
233 int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
234 struct drm_file *file_priv)
236 struct drm_agp_buffer *request = data;
238 return drm_agp_alloc(dev, request);
242 * Search for the AGP memory entry associated with a handle.
244 * \param dev DRM device structure.
245 * \param handle AGP memory handle.
246 * \return pointer to the drm_agp_mem structure associated with \p handle.
248 * Walks through drm_agp_head::memory until finding a matching handle.
250 static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
251 unsigned long handle)
253 struct drm_agp_mem *entry;
255 list_for_each_entry(entry, &dev->agp->memory, head) {
256 if (entry->handle == handle)
263 * Unbind AGP memory from the GATT (ioctl).
265 * \param inode device inode.
266 * \param file_priv DRM file private.
267 * \param cmd command.
268 * \param arg pointer to a drm_agp_binding structure.
269 * \return zero on success or a negative number on failure.
271 * Verifies the AGP device is present and acquired, looks-up the AGP memory
272 * entry and passes it to the unbind_agp() function.
274 int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
276 struct drm_agp_mem *entry;
279 if (!dev->agp || !dev->agp->acquired)
281 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
285 ret = drm_unbind_agp(entry->memory);
290 EXPORT_SYMBOL(drm_agp_unbind);
293 int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
294 struct drm_file *file_priv)
296 struct drm_agp_binding *request = data;
298 return drm_agp_unbind(dev, request);
302 * Bind AGP memory into the GATT (ioctl)
304 * \param inode device inode.
305 * \param file_priv DRM file private.
306 * \param cmd command.
307 * \param arg pointer to a drm_agp_binding structure.
308 * \return zero on success or a negative number on failure.
310 * Verifies the AGP device is present and has been acquired and that no memory
311 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
312 * it to bind_agp() function.
314 int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
316 struct drm_agp_mem *entry;
320 if (!dev->agp || !dev->agp->acquired)
322 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
326 page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
327 if ((retcode = drm_bind_agp(entry->memory, page)))
329 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
330 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
331 dev->agp->base, entry->bound);
334 EXPORT_SYMBOL(drm_agp_bind);
337 int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
338 struct drm_file *file_priv)
340 struct drm_agp_binding *request = data;
342 return drm_agp_bind(dev, request);
346 * Free AGP memory (ioctl).
348 * \param inode device inode.
349 * \param file_priv DRM file private.
350 * \param cmd command.
351 * \param arg pointer to a drm_agp_buffer structure.
352 * \return zero on success or a negative number on failure.
354 * Verifies the AGP device is present and has been acquired and looks up the
355 * AGP memory entry. If the memory it's currently bound, unbind it via
356 * unbind_agp(). Frees it via free_agp() as well as the entry itself
357 * and unlinks from the doubly linked list it's inserted in.
359 int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
361 struct drm_agp_mem *entry;
363 if (!dev->agp || !dev->agp->acquired)
365 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
368 drm_unbind_agp(entry->memory);
370 list_del(&entry->head);
372 drm_free_agp(entry->memory, entry->pages);
376 EXPORT_SYMBOL(drm_agp_free);
380 int drm_agp_free_ioctl(struct drm_device *dev, void *data,
381 struct drm_file *file_priv)
383 struct drm_agp_buffer *request = data;
385 return drm_agp_free(dev, request);
389 * Initialize the AGP resources.
391 * \return pointer to a drm_agp_head structure.
393 * Gets the drm_agp_t structure which is made available by the agpgart module
394 * via the inter_module_* functions. Creates and initializes a drm_agp_head
397 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
399 struct drm_agp_head *head = NULL;
401 if (!(head = kmalloc(sizeof(*head), GFP_KERNEL)))
403 memset((void *)head, 0, sizeof(*head));
404 head->bridge = agp_find_bridge(dev->pdev);
406 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
410 agp_copy_info(head->bridge, &head->agp_info);
411 agp_backend_release(head->bridge);
413 agp_copy_info(head->bridge, &head->agp_info);
415 if (head->agp_info.chipset == NOT_SUPPORTED) {
419 INIT_LIST_HEAD(&head->memory);
420 head->cant_use_aperture = head->agp_info.cant_use_aperture;
421 head->page_mask = head->agp_info.page_mask;
422 head->base = head->agp_info.aper_base;
427 * Binds a collection of pages into AGP memory at the given offset, returning
428 * the AGP memory structure containing them.
430 * No reference is held on the pages during this time -- it is up to the
431 * caller to handle that.
434 drm_agp_bind_pages(struct drm_device *dev,
436 unsigned long num_pages,
445 mem = agp_allocate_memory(dev->agp->bridge, num_pages,
448 DRM_ERROR("Failed to allocate memory for %ld pages\n",
453 for (i = 0; i < num_pages; i++)
454 mem->pages[i] = pages[i];
455 mem->page_count = num_pages;
457 mem->is_flushed = true;
458 ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
460 DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
461 agp_free_memory(mem);
467 EXPORT_SYMBOL(drm_agp_bind_pages);
469 #endif /* __OS_HAS_AGP */