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.
34 #include <linux/module.h>
35 #include <linux/pci.h>
36 #include <linux/slab.h>
40 #include <drm/drm_agpsupport.h>
41 #include <drm/drm_device.h>
42 #include <drm/drm_drv.h>
43 #include <drm/drm_file.h>
44 #include <drm/drm_print.h>
46 #include "drm_legacy.h"
49 * Get AGP information.
51 * \return zero on success or a negative number on failure.
53 * Verifies the AGP device has been initialized and acquired and fills in the
54 * drm_agp_info structure with the information in drm_agp_head::agp_info.
56 int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
58 struct agp_kern_info *kern;
60 if (!dev->agp || !dev->agp->acquired)
63 kern = &dev->agp->agp_info;
64 info->agp_version_major = kern->version.major;
65 info->agp_version_minor = kern->version.minor;
66 info->mode = kern->mode;
67 info->aperture_base = kern->aper_base;
68 info->aperture_size = kern->aper_size * 1024 * 1024;
69 info->memory_allowed = kern->max_memory << PAGE_SHIFT;
70 info->memory_used = kern->current_memory << PAGE_SHIFT;
71 info->id_vendor = kern->device->vendor;
72 info->id_device = kern->device->device;
76 EXPORT_SYMBOL(drm_agp_info);
78 int drm_agp_info_ioctl(struct drm_device *dev, void *data,
79 struct drm_file *file_priv)
81 struct drm_agp_info *info = data;
84 err = drm_agp_info(dev, 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(struct drm_device *dev)
102 struct pci_dev *pdev = to_pci_dev(dev->dev);
106 if (dev->agp->acquired)
108 dev->agp->bridge = agp_backend_acquire(pdev);
109 if (!dev->agp->bridge)
111 dev->agp->acquired = 1;
114 EXPORT_SYMBOL(drm_agp_acquire);
117 * Acquire the AGP device (ioctl).
119 * \return zero on success or a negative number on failure.
121 * Verifies the AGP device hasn't been acquired before and calls
122 * \c agp_backend_acquire.
124 int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
125 struct drm_file *file_priv)
127 return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
131 * Release the AGP device.
133 * \param dev DRM device that is to release AGP.
134 * \return zero on success or a negative number on failure.
136 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
138 int drm_agp_release(struct drm_device *dev)
140 if (!dev->agp || !dev->agp->acquired)
142 agp_backend_release(dev->agp->bridge);
143 dev->agp->acquired = 0;
146 EXPORT_SYMBOL(drm_agp_release);
148 int drm_agp_release_ioctl(struct drm_device *dev, void *data,
149 struct drm_file *file_priv)
151 return drm_agp_release(dev);
155 * Enable the AGP bus.
157 * \param dev DRM device that has previously acquired AGP.
158 * \param mode Requested AGP mode.
159 * \return zero on success or a negative number on failure.
161 * Verifies the AGP device has been acquired but not enabled, and calls
164 int drm_agp_enable(struct drm_device *dev, struct drm_agp_mode mode)
166 if (!dev->agp || !dev->agp->acquired)
169 dev->agp->mode = mode.mode;
170 agp_enable(dev->agp->bridge, mode.mode);
171 dev->agp->enabled = 1;
174 EXPORT_SYMBOL(drm_agp_enable);
176 int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
177 struct drm_file *file_priv)
179 struct drm_agp_mode *mode = data;
181 return drm_agp_enable(dev, *mode);
185 * Allocate AGP memory.
187 * \return zero on success or a negative number on failure.
189 * Verifies the AGP device is present and has been acquired, allocates the
190 * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
192 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
194 struct drm_agp_mem *entry;
195 struct agp_memory *memory;
199 if (!dev->agp || !dev->agp->acquired)
201 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
205 pages = DIV_ROUND_UP(request->size, PAGE_SIZE);
206 type = (u32) request->type;
207 memory = agp_allocate_memory(dev->agp->bridge, pages, type);
213 entry->handle = (unsigned long)memory->key + 1;
214 entry->memory = memory;
216 entry->pages = pages;
217 list_add(&entry->head, &dev->agp->memory);
219 request->handle = entry->handle;
220 request->physical = memory->physical;
224 EXPORT_SYMBOL(drm_agp_alloc);
227 int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
228 struct drm_file *file_priv)
230 struct drm_agp_buffer *request = data;
232 return drm_agp_alloc(dev, request);
236 * Search for the AGP memory entry associated with a handle.
238 * \param dev DRM device structure.
239 * \param handle AGP memory handle.
240 * \return pointer to the drm_agp_mem structure associated with \p handle.
242 * Walks through drm_agp_head::memory until finding a matching handle.
244 static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device *dev,
245 unsigned long handle)
247 struct drm_agp_mem *entry;
249 list_for_each_entry(entry, &dev->agp->memory, head) {
250 if (entry->handle == handle)
257 * Unbind AGP memory from the GATT (ioctl).
259 * \return zero on success or a negative number on failure.
261 * Verifies the AGP device is present and acquired, looks-up the AGP memory
262 * entry and passes it to the unbind_agp() function.
264 int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
266 struct drm_agp_mem *entry;
269 if (!dev->agp || !dev->agp->acquired)
271 entry = drm_agp_lookup_entry(dev, request->handle);
272 if (!entry || !entry->bound)
274 ret = agp_unbind_memory(entry->memory);
279 EXPORT_SYMBOL(drm_agp_unbind);
282 int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
283 struct drm_file *file_priv)
285 struct drm_agp_binding *request = data;
287 return drm_agp_unbind(dev, request);
291 * Bind AGP memory into the GATT (ioctl)
293 * \return zero on success or a negative number on failure.
295 * Verifies the AGP device is present and has been acquired and that no memory
296 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
297 * it to bind_agp() function.
299 int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
301 struct drm_agp_mem *entry;
305 if (!dev->agp || !dev->agp->acquired)
307 entry = drm_agp_lookup_entry(dev, request->handle);
308 if (!entry || entry->bound)
310 page = DIV_ROUND_UP(request->offset, PAGE_SIZE);
311 retcode = agp_bind_memory(entry->memory, page);
314 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
315 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
316 dev->agp->base, entry->bound);
319 EXPORT_SYMBOL(drm_agp_bind);
322 int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
323 struct drm_file *file_priv)
325 struct drm_agp_binding *request = data;
327 return drm_agp_bind(dev, request);
331 * Free AGP memory (ioctl).
333 * \return zero on success or a negative number on failure.
335 * Verifies the AGP device is present and has been acquired and looks up the
336 * AGP memory entry. If the memory is currently bound, unbind it via
337 * unbind_agp(). Frees it via free_agp() as well as the entry itself
338 * and unlinks from the doubly linked list it's inserted in.
340 int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
342 struct drm_agp_mem *entry;
344 if (!dev->agp || !dev->agp->acquired)
346 entry = drm_agp_lookup_entry(dev, request->handle);
350 agp_unbind_memory(entry->memory);
352 list_del(&entry->head);
354 agp_free_memory(entry->memory);
358 EXPORT_SYMBOL(drm_agp_free);
361 int drm_agp_free_ioctl(struct drm_device *dev, void *data,
362 struct drm_file *file_priv)
364 struct drm_agp_buffer *request = data;
366 return drm_agp_free(dev, request);
370 * Initialize the AGP resources.
372 * \return pointer to a drm_agp_head structure.
374 * Gets the drm_agp_t structure which is made available by the agpgart module
375 * via the inter_module_* functions. Creates and initializes a drm_agp_head
378 * Note that final cleanup of the kmalloced structure is directly done in
379 * drm_pci_agp_destroy.
381 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
383 struct pci_dev *pdev = to_pci_dev(dev->dev);
384 struct drm_agp_head *head = NULL;
386 head = kzalloc(sizeof(*head), GFP_KERNEL);
389 head->bridge = agp_find_bridge(pdev);
391 head->bridge = agp_backend_acquire(pdev);
396 agp_copy_info(head->bridge, &head->agp_info);
397 agp_backend_release(head->bridge);
399 agp_copy_info(head->bridge, &head->agp_info);
401 if (head->agp_info.chipset == NOT_SUPPORTED) {
405 INIT_LIST_HEAD(&head->memory);
406 head->cant_use_aperture = head->agp_info.cant_use_aperture;
407 head->page_mask = head->agp_info.page_mask;
408 head->base = head->agp_info.aper_base;
411 /* Only exported for i810.ko */
412 EXPORT_SYMBOL(drm_agp_init);
415 * drm_legacy_agp_clear - Clear AGP resource list
418 * Iterate over all AGP resources and remove them. But keep the AGP head
419 * intact so it can still be used. It is safe to call this if AGP is disabled or
420 * was already removed.
422 * Cleanup is only done for drivers who have DRIVER_LEGACY set.
424 void drm_legacy_agp_clear(struct drm_device *dev)
426 struct drm_agp_mem *entry, *tempe;
430 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
433 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
435 agp_unbind_memory(entry->memory);
436 agp_free_memory(entry->memory);
439 INIT_LIST_HEAD(&dev->agp->memory);
441 if (dev->agp->acquired)
442 drm_agp_release(dev);
444 dev->agp->acquired = 0;
445 dev->agp->enabled = 0;