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>
38 #if IS_ENABLED(CONFIG_AGP)
42 #include <drm/drm_device.h>
43 #include <drm/drm_drv.h>
44 #include <drm/drm_file.h>
45 #include <drm/drm_print.h>
47 #include "drm_legacy.h"
49 #if IS_ENABLED(CONFIG_AGP)
52 * Get AGP information.
54 * \return zero on success or a negative number on failure.
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.
59 int drm_legacy_agp_info(struct drm_device *dev, struct drm_agp_info *info)
61 struct agp_kern_info *kern;
63 if (!dev->agp || !dev->agp->acquired)
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;
79 EXPORT_SYMBOL(drm_legacy_agp_info);
81 int drm_legacy_agp_info_ioctl(struct drm_device *dev, void *data,
82 struct drm_file *file_priv)
84 struct drm_agp_info *info = data;
87 err = drm_legacy_agp_info(dev, info);
95 * Acquire the AGP device.
97 * \param dev DRM device that is to acquire AGP.
98 * \return zero on success or a negative number on failure.
100 * Verifies the AGP device hasn't been acquired before and calls
101 * \c agp_backend_acquire.
103 int drm_legacy_agp_acquire(struct drm_device *dev)
105 struct pci_dev *pdev = to_pci_dev(dev->dev);
109 if (dev->agp->acquired)
111 dev->agp->bridge = agp_backend_acquire(pdev);
112 if (!dev->agp->bridge)
114 dev->agp->acquired = 1;
117 EXPORT_SYMBOL(drm_legacy_agp_acquire);
120 * Acquire the AGP device (ioctl).
122 * \return zero on success or a negative number on failure.
124 * Verifies the AGP device hasn't been acquired before and calls
125 * \c agp_backend_acquire.
127 int drm_legacy_agp_acquire_ioctl(struct drm_device *dev, void *data,
128 struct drm_file *file_priv)
130 return drm_legacy_agp_acquire((struct drm_device *)file_priv->minor->dev);
134 * Release the AGP device.
136 * \param dev DRM device that is to release AGP.
137 * \return zero on success or a negative number on failure.
139 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
141 int drm_legacy_agp_release(struct drm_device *dev)
143 if (!dev->agp || !dev->agp->acquired)
145 agp_backend_release(dev->agp->bridge);
146 dev->agp->acquired = 0;
149 EXPORT_SYMBOL(drm_legacy_agp_release);
151 int drm_legacy_agp_release_ioctl(struct drm_device *dev, void *data,
152 struct drm_file *file_priv)
154 return drm_legacy_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_legacy_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->enabled = 1;
177 EXPORT_SYMBOL(drm_legacy_agp_enable);
179 int drm_legacy_agp_enable_ioctl(struct drm_device *dev, void *data,
180 struct drm_file *file_priv)
182 struct drm_agp_mode *mode = data;
184 return drm_legacy_agp_enable(dev, *mode);
188 * Allocate AGP memory.
190 * \return zero on success or a negative number on failure.
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.
195 int drm_legacy_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
197 struct drm_agp_mem *entry;
198 struct agp_memory *memory;
202 if (!dev->agp || !dev->agp->acquired)
204 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
208 pages = DIV_ROUND_UP(request->size, PAGE_SIZE);
209 type = (u32) request->type;
210 memory = agp_allocate_memory(dev->agp->bridge, pages, type);
216 entry->handle = (unsigned long)memory->key + 1;
217 entry->memory = memory;
219 entry->pages = pages;
220 list_add(&entry->head, &dev->agp->memory);
222 request->handle = entry->handle;
223 request->physical = memory->physical;
227 EXPORT_SYMBOL(drm_legacy_agp_alloc);
230 int drm_legacy_agp_alloc_ioctl(struct drm_device *dev, void *data,
231 struct drm_file *file_priv)
233 struct drm_agp_buffer *request = data;
235 return drm_legacy_agp_alloc(dev, request);
239 * Search for the AGP memory entry associated with a handle.
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.
245 * Walks through drm_agp_head::memory until finding a matching handle.
247 static struct drm_agp_mem *drm_legacy_agp_lookup_entry(struct drm_device *dev,
248 unsigned long handle)
250 struct drm_agp_mem *entry;
252 list_for_each_entry(entry, &dev->agp->memory, head) {
253 if (entry->handle == handle)
260 * Unbind AGP memory from the GATT (ioctl).
262 * \return zero on success or a negative number on failure.
264 * Verifies the AGP device is present and acquired, looks-up the AGP memory
265 * entry and passes it to the unbind_agp() function.
267 int drm_legacy_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
269 struct drm_agp_mem *entry;
272 if (!dev->agp || !dev->agp->acquired)
274 entry = drm_legacy_agp_lookup_entry(dev, request->handle);
275 if (!entry || !entry->bound)
277 ret = agp_unbind_memory(entry->memory);
282 EXPORT_SYMBOL(drm_legacy_agp_unbind);
285 int drm_legacy_agp_unbind_ioctl(struct drm_device *dev, void *data,
286 struct drm_file *file_priv)
288 struct drm_agp_binding *request = data;
290 return drm_legacy_agp_unbind(dev, request);
294 * Bind AGP memory into the GATT (ioctl)
296 * \return zero on success or a negative number on failure.
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.
302 int drm_legacy_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
304 struct drm_agp_mem *entry;
308 if (!dev->agp || !dev->agp->acquired)
310 entry = drm_legacy_agp_lookup_entry(dev, request->handle);
311 if (!entry || entry->bound)
313 page = DIV_ROUND_UP(request->offset, PAGE_SIZE);
314 retcode = agp_bind_memory(entry->memory, page);
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);
322 EXPORT_SYMBOL(drm_legacy_agp_bind);
325 int drm_legacy_agp_bind_ioctl(struct drm_device *dev, void *data,
326 struct drm_file *file_priv)
328 struct drm_agp_binding *request = data;
330 return drm_legacy_agp_bind(dev, request);
334 * Free AGP memory (ioctl).
336 * \return zero on success or a negative number on failure.
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.
343 int drm_legacy_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
345 struct drm_agp_mem *entry;
347 if (!dev->agp || !dev->agp->acquired)
349 entry = drm_legacy_agp_lookup_entry(dev, request->handle);
353 agp_unbind_memory(entry->memory);
355 list_del(&entry->head);
357 agp_free_memory(entry->memory);
361 EXPORT_SYMBOL(drm_legacy_agp_free);
364 int drm_legacy_agp_free_ioctl(struct drm_device *dev, void *data,
365 struct drm_file *file_priv)
367 struct drm_agp_buffer *request = data;
369 return drm_legacy_agp_free(dev, request);
373 * Initialize the AGP resources.
375 * \return pointer to a drm_agp_head structure.
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
381 * Note that final cleanup of the kmalloced structure is directly done in
382 * drm_pci_agp_destroy.
384 struct drm_agp_head *drm_legacy_agp_init(struct drm_device *dev)
386 struct pci_dev *pdev = to_pci_dev(dev->dev);
387 struct drm_agp_head *head = NULL;
389 head = kzalloc(sizeof(*head), GFP_KERNEL);
392 head->bridge = agp_find_bridge(pdev);
394 head->bridge = agp_backend_acquire(pdev);
399 agp_copy_info(head->bridge, &head->agp_info);
400 agp_backend_release(head->bridge);
402 agp_copy_info(head->bridge, &head->agp_info);
404 if (head->agp_info.chipset == NOT_SUPPORTED) {
408 INIT_LIST_HEAD(&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;
414 /* Only exported for i810.ko */
415 EXPORT_SYMBOL(drm_legacy_agp_init);
418 * drm_legacy_agp_clear - Clear AGP resource list
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.
425 * Cleanup is only done for drivers who have DRIVER_LEGACY set.
427 void drm_legacy_agp_clear(struct drm_device *dev)
429 struct drm_agp_mem *entry, *tempe;
433 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
436 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
438 agp_unbind_memory(entry->memory);
439 agp_free_memory(entry->memory);
442 INIT_LIST_HEAD(&dev->agp->memory);
444 if (dev->agp->acquired)
445 drm_legacy_agp_release(dev);
447 dev->agp->acquired = 0;
448 dev->agp->enabled = 0;