summaryrefslogtreecommitdiff
path: root/drivers/char/drm/drm_agpsupport.c
blob: 8c215adcb4b2b623e4848b50fba212a66956799a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
/**
 * \file drm_agpsupport.h 
 * DRM support for AGP/GART backend
 *    
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"
#include <linux/module.h>

#if __OS_HAS_AGP

/**
 * Get AGP information.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a (output) drm_agp_info structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device has been initialized and acquired and fills in the
 * drm_agp_info structure with the information in drm_agp_head::agp_info.
 */
int drm_agp_info(drm_device_t *dev, drm_agp_info_t *info)
{
	DRM_AGP_KERN     *kern;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;

	kern                   = &dev->agp->agp_info;
	info->agp_version_major = kern->version.major;
	info->agp_version_minor = kern->version.minor;
	info->mode              = kern->mode;
	info->aperture_base     = kern->aper_base;
	info->aperture_size     = kern->aper_size * 1024 * 1024;
	info->memory_allowed    = kern->max_memory << PAGE_SHIFT;
	info->memory_used       = kern->current_memory << PAGE_SHIFT;
	info->id_vendor         = kern->device->vendor;
	info->id_device         = kern->device->device;

	return 0;
}
EXPORT_SYMBOL(drm_agp_info);

int drm_agp_info_ioctl(struct inode *inode, struct file *filp,
		 unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_agp_info_t info;
	int err;

	err = drm_agp_info(dev, &info);
	if (err)
		return err;
	
	if (copy_to_user((drm_agp_info_t __user *) arg, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

/**
 * Acquire the AGP device.
 *
 * \param dev DRM device that is to acquire AGP
 * \return zero on success or a negative number on failure. 
 *
 * Verifies the AGP device hasn't been acquired before and calls
 * \c agp_backend_acquire.
 */
int drm_agp_acquire(drm_device_t *dev)
{
	if (!dev->agp)
		return -ENODEV;
	if (dev->agp->acquired)
		return -EBUSY;
	if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
		return -ENODEV;
	dev->agp->acquired = 1;
	return 0;
}
EXPORT_SYMBOL(drm_agp_acquire);

/**
 * Acquire the AGP device (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device hasn't been acquired before and calls
 * \c agp_backend_acquire.
 */
int drm_agp_acquire_ioctl(struct inode *inode, struct file *filp,
			  unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	
	return drm_agp_acquire( (drm_device_t *) priv->head->dev );
}

/**
 * Release the AGP device.
 *
 * \param dev DRM device that is to release AGP
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
 */
int drm_agp_release(drm_device_t *dev)
{
	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	agp_backend_release(dev->agp->bridge);
	dev->agp->acquired = 0;
	return 0;
}
EXPORT_SYMBOL(drm_agp_release);

int drm_agp_release_ioctl(struct inode *inode, struct file *filp,
			  unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	
	return drm_agp_release(dev);
}

/**
 * Enable the AGP bus.
 * 
 * \param dev DRM device that has previously acquired AGP.
 * \param mode Requested AGP mode.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device has been acquired but not enabled, and calls
 * \c agp_enable.
 */
int drm_agp_enable(drm_device_t *dev, drm_agp_mode_t mode)
{
	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;

	dev->agp->mode    = mode.mode;
	agp_enable(dev->agp->bridge, mode.mode);
	dev->agp->base    = dev->agp->agp_info.aper_base;
	dev->agp->enabled = 1;
	return 0;
}
EXPORT_SYMBOL(drm_agp_enable);

int drm_agp_enable_ioctl(struct inode *inode, struct file *filp,
		   unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_agp_mode_t mode;


	if (copy_from_user(&mode, (drm_agp_mode_t __user *) arg, sizeof(mode)))
		return -EFAULT;

	return drm_agp_enable(dev, mode);
}

/**
 * Allocate AGP memory.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_buffer structure.
 * \return zero on success or a negative number on failure.
 * 
 * Verifies the AGP device is present and has been acquired, allocates the
 * memory via alloc_agp() and creates a drm_agp_mem entry for it.
 */
int drm_agp_alloc(struct inode *inode, struct file *filp,
		   unsigned int cmd, unsigned long arg)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->head->dev;
	drm_agp_buffer_t request;
	drm_agp_mem_t    *entry;
	DRM_AGP_MEM      *memory;
	unsigned long    pages;
	u32 		 type;
	drm_agp_buffer_t __user *argp = (void __user *)arg;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	if (copy_from_user(&request, argp, sizeof(request)))
		return -EFAULT;
	if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
		return -ENOMEM;

   	memset(entry, 0, sizeof(*entry));

	pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
	type = (u32) request.type;

	if (!(memory = drm_alloc_agp(dev, pages, type))) {
		drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
		return -ENOMEM;
	}

	entry->handle    = (unsigned long)memory->key + 1;
	entry->memory    = memory;
	entry->bound     = 0;
	entry->pages     = pages;
	entry->prev      = NULL;
	entry->next      = dev->agp->memory;
	if (dev->agp->memory)
		dev->agp->memory->prev = entry;
	dev->agp->memory = entry;

	request.handle   = entry->handle;
	request.physical = memory->physical;

	if (copy_to_user(argp, &request, sizeof(request))) {
		dev->agp->memory       = entry->next;
		dev->agp->memory->prev = NULL;
		drm_free_agp(memory, pages);
		drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
		return -EFAULT;
	}
	return 0;
}

/**
 * Search for the AGP memory entry associated with a handle.
 *
 * \param dev DRM device structure.
 * \param handle AGP memory handle.
 * \return pointer to the drm_agp_mem structure associated with \p handle.
 * 
 * Walks through drm_agp_head::memory until finding a matching handle.
 */
static drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t *dev,
					    unsigned long handle)
{
	drm_agp_mem_t *entry;

	for (entry = dev->agp->memory; entry; entry = entry->next) {
		if (entry->handle == handle)
			return entry;
	}
	return NULL;
}

/**
 * Unbind AGP memory from the GATT (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_binding structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and acquired, looks-up the AGP memory
 * entry and passes it to the unbind_agp() function.
 */
int drm_agp_unbind(struct inode *inode, struct file *filp,
		    unsigned int cmd, unsigned long arg)
{
	drm_file_t	  *priv	 = filp->private_data;
	drm_device_t	  *dev	 = priv->head->dev;
	drm_agp_binding_t request;
	drm_agp_mem_t     *entry;
	int ret;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
		return -EFAULT;
	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
		return -EINVAL;
	if (!entry->bound)
		return -EINVAL;
	ret = drm_unbind_agp(entry->memory);
	if (ret == 0)
	    entry->bound = 0;
	return ret;
}

/**
 * Bind AGP memory into the GATT (ioctl)
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_binding structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and has been acquired and that no memory
 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
 * it to bind_agp() function.
 */
int drm_agp_bind(struct inode *inode, struct file *filp,
		  unsigned int cmd, unsigned long arg)
{
	drm_file_t	  *priv	 = filp->private_data;
	drm_device_t	  *dev	 = priv->head->dev;
	drm_agp_binding_t request;
	drm_agp_mem_t     *entry;
	int               retcode;
	int               page;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
		return -EFAULT;
	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
		return -EINVAL;
	if (entry->bound)
		return -EINVAL;
	page = (request.offset + PAGE_SIZE - 1) / PAGE_SIZE;
	if ((retcode = drm_bind_agp(entry->memory, page)))
		return retcode;
	entry->bound = dev->agp->base + (page << PAGE_SHIFT);
	DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
		  dev->agp->base, entry->bound);
	return 0;
}

/**
 * Free AGP memory (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_buffer structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and has been acquired and looks up the
 * AGP memory entry. If the memory it's currently bound, unbind it via
 * unbind_agp(). Frees it via free_agp() as well as the entry itself
 * and unlinks from the doubly linked list it's inserted in.
 */
int drm_agp_free(struct inode *inode, struct file *filp,
		  unsigned int cmd, unsigned long arg)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->head->dev;
	drm_agp_buffer_t request;
	drm_agp_mem_t    *entry;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	if (copy_from_user(&request, (drm_agp_buffer_t __user *)arg, sizeof(request)))
		return -EFAULT;
	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
		return -EINVAL;
	if (entry->bound)
		drm_unbind_agp(entry->memory);

	if (entry->prev)
		entry->prev->next = entry->next;
	else
		dev->agp->memory = entry->next;

	if (entry->next)
		entry->next->prev = entry->prev;

	drm_free_agp(entry->memory, entry->pages);
	drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
	return 0;
}

/**
 * Initialize the AGP resources.
 *
 * \return pointer to a drm_agp_head structure.
 *
 */
drm_agp_head_t *drm_agp_init(drm_device_t *dev)
{
	drm_agp_head_t *head         = NULL;

	if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
		return NULL;
	memset((void *)head, 0, sizeof(*head));
	head->bridge = agp_find_bridge(dev->pdev);
	if (!head->bridge) {
		if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
			drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
			return NULL;
		}
		agp_copy_info(head->bridge, &head->agp_info);
		agp_backend_release(head->bridge);
	} else {
		agp_copy_info(head->bridge, &head->agp_info);
	}
	if (head->agp_info.chipset == NOT_SUPPORTED) {
		drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
		return NULL;
	}
	head->memory = NULL;
	head->cant_use_aperture = head->agp_info.cant_use_aperture;
	head->page_mask = head->agp_info.page_mask;

	return head;
}

/** Calls agp_allocate_memory() */
DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data *bridge, size_t pages, u32 type)
{
	return agp_allocate_memory(bridge, pages, type);
}

/** Calls agp_free_memory() */
int drm_agp_free_memory(DRM_AGP_MEM *handle)
{
	if (!handle)
		return 0;
	agp_free_memory(handle);
	return 1;
}

/** Calls agp_bind_memory() */
int drm_agp_bind_memory(DRM_AGP_MEM *handle, off_t start)
{
	if (!handle)
		return -EINVAL;
	return agp_bind_memory(handle, start);
}
EXPORT_SYMBOL(drm_agp_bind_memory);

/** Calls agp_unbind_memory() */
int drm_agp_unbind_memory(DRM_AGP_MEM *handle)
{
	if (!handle)
		return -EINVAL;
	return agp_unbind_memory(handle);
}

#endif /* __OS_HAS_AGP */