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/drivers/char/drm/drm_agpsupport.c

https://bitbucket.org/evzijst/gittest
C | 448 lines | 251 code | 44 blank | 153 comment | 50 complexity | 927ba6424072d55f7898cc15e2ef5d66 MD5 | raw file
  1/**
  2 * \file drm_agpsupport.h 
  3 * DRM support for AGP/GART backend
  4 *    
  5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
  6 * \author Gareth Hughes <gareth@valinux.com>
  7 */
  8
  9/*
 10 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 12 * All Rights Reserved.
 13 *
 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:
 20 *
 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
 23 * Software.
 24 *
 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.
 32 */
 33
 34#include "drmP.h"
 35#include <linux/module.h>
 36
 37#if __OS_HAS_AGP
 38
 39/**
 40 * AGP information ioctl.
 41 *
 42 * \param inode device inode.
 43 * \param filp file pointer.
 44 * \param cmd command.
 45 * \param arg pointer to a (output) drm_agp_info structure.
 46 * \return zero on success or a negative number on failure.
 47 *
 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.
 50 */
 51int drm_agp_info(struct inode *inode, struct file *filp,
 52		  unsigned int cmd, unsigned long arg)
 53{
 54	drm_file_t	 *priv	 = filp->private_data;
 55	drm_device_t	 *dev	 = priv->head->dev;
 56	DRM_AGP_KERN     *kern;
 57	drm_agp_info_t   info;
 58
 59	if (!dev->agp || !dev->agp->acquired)
 60		return -EINVAL;
 61
 62	kern                   = &dev->agp->agp_info;
 63	info.agp_version_major = kern->version.major;
 64	info.agp_version_minor = kern->version.minor;
 65	info.mode              = kern->mode;
 66	info.aperture_base     = kern->aper_base;
 67	info.aperture_size     = kern->aper_size * 1024 * 1024;
 68	info.memory_allowed    = kern->max_memory << PAGE_SHIFT;
 69	info.memory_used       = kern->current_memory << PAGE_SHIFT;
 70	info.id_vendor         = kern->device->vendor;
 71	info.id_device         = kern->device->device;
 72
 73	if (copy_to_user((drm_agp_info_t __user *)arg, &info, sizeof(info)))
 74		return -EFAULT;
 75	return 0;
 76}
 77
 78/**
 79 * Acquire the AGP device (ioctl).
 80 *
 81 * \param inode device inode.
 82 * \param filp file pointer.
 83 * \param cmd command.
 84 * \param arg user argument.
 85 * \return zero on success or a negative number on failure. 
 86 *
 87 * Verifies the AGP device hasn't been acquired before and calls
 88 * agp_acquire().
 89 */
 90int drm_agp_acquire(struct inode *inode, struct file *filp,
 91		     unsigned int cmd, unsigned long arg)
 92{
 93	drm_file_t	 *priv	 = filp->private_data;
 94	drm_device_t	 *dev	 = priv->head->dev;
 95
 96	if (!dev->agp)
 97		return -ENODEV;
 98	if (dev->agp->acquired)
 99		return -EBUSY;
100	if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
101		return -ENODEV;
102	dev->agp->acquired = 1;
103	return 0;
104}
105
106/**
107 * Release the AGP device (ioctl).
108 *
109 * \param inode device inode.
110 * \param filp file pointer.
111 * \param cmd command.
112 * \param arg user argument.
113 * \return zero on success or a negative number on failure.
114 *
115 * Verifies the AGP device has been acquired and calls agp_backend_release().
116 */
117int drm_agp_release(struct inode *inode, struct file *filp,
118		     unsigned int cmd, unsigned long arg)
119{
120	drm_file_t	 *priv	 = filp->private_data;
121	drm_device_t	 *dev	 = priv->head->dev;
122
123	if (!dev->agp || !dev->agp->acquired)
124		return -EINVAL;
125	agp_backend_release(dev->agp->bridge);
126	dev->agp->acquired = 0;
127	return 0;
128
129}
130
131/**
132 * Release the AGP device.
133 *
134 * Calls agp_backend_release().
135 */
136void drm_agp_do_release(drm_device_t *dev)
137{
138  agp_backend_release(dev->agp->bridge);
139}
140
141/**
142 * Enable the AGP bus.
143 * 
144 * \param inode device inode.
145 * \param filp file pointer.
146 * \param cmd command.
147 * \param arg pointer to a drm_agp_mode structure.
148 * \return zero on success or a negative number on failure.
149 *
150 * Verifies the AGP device has been acquired but not enabled, and calls
151 * agp_enable().
152 */
153int drm_agp_enable(struct inode *inode, struct file *filp,
154		    unsigned int cmd, unsigned long arg)
155{
156	drm_file_t	 *priv	 = filp->private_data;
157	drm_device_t	 *dev	 = priv->head->dev;
158	drm_agp_mode_t   mode;
159
160	if (!dev->agp || !dev->agp->acquired)
161		return -EINVAL;
162
163	if (copy_from_user(&mode, (drm_agp_mode_t __user *)arg, sizeof(mode)))
164		return -EFAULT;
165
166	dev->agp->mode    = mode.mode;
167	agp_enable(dev->agp->bridge, mode.mode);
168	dev->agp->base    = dev->agp->agp_info.aper_base;
169	dev->agp->enabled = 1;
170	return 0;
171}
172
173/**
174 * Allocate AGP memory.
175 *
176 * \param inode device inode.
177 * \param filp file pointer.
178 * \param cmd command.
179 * \param arg pointer to a drm_agp_buffer structure.
180 * \return zero on success or a negative number on failure.
181 * 
182 * Verifies the AGP device is present and has been acquired, allocates the
183 * memory via alloc_agp() and creates a drm_agp_mem entry for it.
184 */
185int drm_agp_alloc(struct inode *inode, struct file *filp,
186		   unsigned int cmd, unsigned long arg)
187{
188	drm_file_t	 *priv	 = filp->private_data;
189	drm_device_t	 *dev	 = priv->head->dev;
190	drm_agp_buffer_t request;
191	drm_agp_mem_t    *entry;
192	DRM_AGP_MEM      *memory;
193	unsigned long    pages;
194	u32 		 type;
195	drm_agp_buffer_t __user *argp = (void __user *)arg;
196
197	if (!dev->agp || !dev->agp->acquired)
198		return -EINVAL;
199	if (copy_from_user(&request, argp, sizeof(request)))
200		return -EFAULT;
201	if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
202		return -ENOMEM;
203
204   	memset(entry, 0, sizeof(*entry));
205
206	pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
207	type = (u32) request.type;
208
209	if (!(memory = drm_alloc_agp(dev->agp->bridge, pages, type))) {
210		drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
211		return -ENOMEM;
212	}
213
214	entry->handle    = (unsigned long)memory->key + 1;
215	entry->memory    = memory;
216	entry->bound     = 0;
217	entry->pages     = pages;
218	entry->prev      = NULL;
219	entry->next      = dev->agp->memory;
220	if (dev->agp->memory)
221		dev->agp->memory->prev = entry;
222	dev->agp->memory = entry;
223
224	request.handle   = entry->handle;
225	request.physical = memory->physical;
226
227	if (copy_to_user(argp, &request, sizeof(request))) {
228		dev->agp->memory       = entry->next;
229		dev->agp->memory->prev = NULL;
230		drm_free_agp(memory, pages);
231		drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
232		return -EFAULT;
233	}
234	return 0;
235}
236
237/**
238 * Search for the AGP memory entry associated with a handle.
239 *
240 * \param dev DRM device structure.
241 * \param handle AGP memory handle.
242 * \return pointer to the drm_agp_mem structure associated with \p handle.
243 * 
244 * Walks through drm_agp_head::memory until finding a matching handle.
245 */
246static drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t *dev,
247					    unsigned long handle)
248{
249	drm_agp_mem_t *entry;
250
251	for (entry = dev->agp->memory; entry; entry = entry->next) {
252		if (entry->handle == handle)
253			return entry;
254	}
255	return NULL;
256}
257
258/**
259 * Unbind AGP memory from the GATT (ioctl).
260 *
261 * \param inode device inode.
262 * \param filp file pointer.
263 * \param cmd command.
264 * \param arg pointer to a drm_agp_binding structure.
265 * \return zero on success or a negative number on failure.
266 *
267 * Verifies the AGP device is present and acquired, looks-up the AGP memory
268 * entry and passes it to the unbind_agp() function.
269 */
270int drm_agp_unbind(struct inode *inode, struct file *filp,
271		    unsigned int cmd, unsigned long arg)
272{
273	drm_file_t	  *priv	 = filp->private_data;
274	drm_device_t	  *dev	 = priv->head->dev;
275	drm_agp_binding_t request;
276	drm_agp_mem_t     *entry;
277	int ret;
278
279	if (!dev->agp || !dev->agp->acquired)
280		return -EINVAL;
281	if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
282		return -EFAULT;
283	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
284		return -EINVAL;
285	if (!entry->bound)
286		return -EINVAL;
287	ret = drm_unbind_agp(entry->memory);
288	if (ret == 0)
289	    entry->bound = 0;
290	return ret;
291}
292
293/**
294 * Bind AGP memory into the GATT (ioctl)
295 *
296 * \param inode device inode.
297 * \param filp file pointer.
298 * \param cmd command.
299 * \param arg pointer to a drm_agp_binding structure.
300 * \return zero on success or a negative number on failure.
301 *
302 * Verifies the AGP device is present and has been acquired and that no memory
303 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
304 * it to bind_agp() function.
305 */
306int drm_agp_bind(struct inode *inode, struct file *filp,
307		  unsigned int cmd, unsigned long arg)
308{
309	drm_file_t	  *priv	 = filp->private_data;
310	drm_device_t	  *dev	 = priv->head->dev;
311	drm_agp_binding_t request;
312	drm_agp_mem_t     *entry;
313	int               retcode;
314	int               page;
315
316	if (!dev->agp || !dev->agp->acquired)
317		return -EINVAL;
318	if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
319		return -EFAULT;
320	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
321		return -EINVAL;
322	if (entry->bound)
323		return -EINVAL;
324	page = (request.offset + PAGE_SIZE - 1) / PAGE_SIZE;
325	if ((retcode = drm_bind_agp(entry->memory, page)))
326		return retcode;
327	entry->bound = dev->agp->base + (page << PAGE_SHIFT);
328	DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
329		  dev->agp->base, entry->bound);
330	return 0;
331}
332
333/**
334 * Free AGP memory (ioctl).
335 *
336 * \param inode device inode.
337 * \param filp file pointer.
338 * \param cmd command.
339 * \param arg pointer to a drm_agp_buffer structure.
340 * \return zero on success or a negative number on failure.
341 *
342 * Verifies the AGP device is present and has been acquired and looks up the
343 * AGP memory entry. If the memory it's currently bound, unbind it via
344 * unbind_agp(). Frees it via free_agp() as well as the entry itself
345 * and unlinks from the doubly linked list it's inserted in.
346 */
347int drm_agp_free(struct inode *inode, struct file *filp,
348		  unsigned int cmd, unsigned long arg)
349{
350	drm_file_t	 *priv	 = filp->private_data;
351	drm_device_t	 *dev	 = priv->head->dev;
352	drm_agp_buffer_t request;
353	drm_agp_mem_t    *entry;
354
355	if (!dev->agp || !dev->agp->acquired)
356		return -EINVAL;
357	if (copy_from_user(&request, (drm_agp_buffer_t __user *)arg, sizeof(request)))
358		return -EFAULT;
359	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
360		return -EINVAL;
361	if (entry->bound)
362		drm_unbind_agp(entry->memory);
363
364	if (entry->prev)
365		entry->prev->next = entry->next;
366	else
367		dev->agp->memory = entry->next;
368
369	if (entry->next)
370		entry->next->prev = entry->prev;
371
372	drm_free_agp(entry->memory, entry->pages);
373	drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
374	return 0;
375}
376
377/**
378 * Initialize the AGP resources.
379 *
380 * \return pointer to a drm_agp_head structure.
381 *
382 */
383drm_agp_head_t *drm_agp_init(drm_device_t *dev)
384{
385	drm_agp_head_t *head         = NULL;
386
387	if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
388		return NULL;
389	memset((void *)head, 0, sizeof(*head));
390	head->bridge = agp_find_bridge(dev->pdev);
391	if (!head->bridge) {
392		if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
393			drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
394			return NULL;
395		}
396		agp_copy_info(head->bridge, &head->agp_info);
397		agp_backend_release(head->bridge);
398	} else {
399		agp_copy_info(head->bridge, &head->agp_info);
400	}
401	if (head->agp_info.chipset == NOT_SUPPORTED) {
402		drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
403		return NULL;
404	}
405	head->memory = NULL;
406#if LINUX_VERSION_CODE <= 0x020408
407	head->cant_use_aperture = 0;
408	head->page_mask = ~(0xfff);
409#else
410	head->cant_use_aperture = head->agp_info.cant_use_aperture;
411	head->page_mask = head->agp_info.page_mask;
412#endif
413
414	return head;
415}
416
417/** Calls agp_allocate_memory() */
418DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data *bridge, size_t pages, u32 type)
419{
420	return agp_allocate_memory(bridge, pages, type);
421}
422
423/** Calls agp_free_memory() */
424int drm_agp_free_memory(DRM_AGP_MEM *handle)
425{
426	if (!handle)
427		return 0;
428	agp_free_memory(handle);
429	return 1;
430}
431
432/** Calls agp_bind_memory() */
433int drm_agp_bind_memory(DRM_AGP_MEM *handle, off_t start)
434{
435	if (!handle)
436		return -EINVAL;
437	return agp_bind_memory(handle, start);
438}
439
440/** Calls agp_unbind_memory() */
441int drm_agp_unbind_memory(DRM_AGP_MEM *handle)
442{
443	if (!handle)
444		return -EINVAL;
445	return agp_unbind_memory(handle);
446}
447
448#endif /* __OS_HAS_AGP */