summaryrefslogtreecommitdiff
path: root/drivers/char/drm/drm_fops.c
blob: 7bc51bac450d70210fee213275536148ebc8654b (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
468
/**
 * \file drm_fops.c
 * File operations for DRM
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Daryll Strauss <daryll@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Mon Jan  4 08:58:31 1999 by faith@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 "drm_sarea.h"
#include <linux/poll.h>

static int drm_open_helper(struct inode *inode, struct file *filp,
			   struct drm_device * dev);

static int drm_setup(struct drm_device * dev)
{
	drm_local_map_t *map;
	int i;
	int ret;
	u32 sareapage;

	if (dev->driver->firstopen) {
		ret = dev->driver->firstopen(dev);
		if (ret != 0)
			return ret;
	}

	dev->magicfree.next = NULL;

	/* prebuild the SAREA */
	sareapage = max_t(unsigned, SAREA_MAX, PAGE_SIZE);
	i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map);
	if (i != 0)
		return i;

	atomic_set(&dev->ioctl_count, 0);
	atomic_set(&dev->vma_count, 0);
	dev->buf_use = 0;
	atomic_set(&dev->buf_alloc, 0);

	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
		i = drm_dma_setup(dev);
		if (i < 0)
			return i;
	}

	for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
		atomic_set(&dev->counts[i], 0);

	drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
	INIT_LIST_HEAD(&dev->magicfree);

	dev->sigdata.lock = NULL;
	init_waitqueue_head(&dev->lock.lock_queue);
	dev->queue_count = 0;
	dev->queue_reserved = 0;
	dev->queue_slots = 0;
	dev->queuelist = NULL;
	dev->irq_enabled = 0;
	dev->context_flag = 0;
	dev->interrupt_flag = 0;
	dev->dma_flag = 0;
	dev->last_context = 0;
	dev->last_switch = 0;
	dev->last_checked = 0;
	init_waitqueue_head(&dev->context_wait);
	dev->if_version = 0;

	dev->ctx_start = 0;
	dev->lck_start = 0;

	dev->buf_async = NULL;
	init_waitqueue_head(&dev->buf_readers);
	init_waitqueue_head(&dev->buf_writers);

	DRM_DEBUG("\n");

	/*
	 * The kernel's context could be created here, but is now created
	 * in drm_dma_enqueue.  This is more resource-efficient for
	 * hardware that does not do DMA, but may mean that
	 * drm_select_queue fails between the time the interrupt is
	 * initialized and the time the queues are initialized.
	 */

	return 0;
}

/**
 * Open file.
 *
 * \param inode device inode
 * \param filp file pointer.
 * \return zero on success or a negative number on failure.
 *
 * Searches the DRM device with the same minor number, calls open_helper(), and
 * increments the device open count. If the open count was previous at zero,
 * i.e., it's the first that the device is open, then calls setup().
 */
int drm_open(struct inode *inode, struct file *filp)
{
	struct drm_device *dev = NULL;
	int minor = iminor(inode);
	int retcode = 0;

	if (!((minor >= 0) && (minor < drm_cards_limit)))
		return -ENODEV;

	if (!drm_heads[minor])
		return -ENODEV;

	if (!(dev = drm_heads[minor]->dev))
		return -ENODEV;

	retcode = drm_open_helper(inode, filp, dev);
	if (!retcode) {
		atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
		spin_lock(&dev->count_lock);
		if (!dev->open_count++) {
			spin_unlock(&dev->count_lock);
			return drm_setup(dev);
		}
		spin_unlock(&dev->count_lock);
	}

	return retcode;
}
EXPORT_SYMBOL(drm_open);

/**
 * File \c open operation.
 *
 * \param inode device inode.
 * \param filp file pointer.
 *
 * Puts the dev->fops corresponding to the device minor number into
 * \p filp, call the \c open method, and restore the file operations.
 */
int drm_stub_open(struct inode *inode, struct file *filp)
{
	struct drm_device *dev = NULL;
	int minor = iminor(inode);
	int err = -ENODEV;
	const struct file_operations *old_fops;

	DRM_DEBUG("\n");

	if (!((minor >= 0) && (minor < drm_cards_limit)))
		return -ENODEV;

	if (!drm_heads[minor])
		return -ENODEV;

	if (!(dev = drm_heads[minor]->dev))
		return -ENODEV;

	old_fops = filp->f_op;
	filp->f_op = fops_get(&dev->driver->fops);
	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
		fops_put(filp->f_op);
		filp->f_op = fops_get(old_fops);
	}
	fops_put(old_fops);

	return err;
}

/**
 * Check whether DRI will run on this CPU.
 *
 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
 */
static int drm_cpu_valid(void)
{
#if defined(__i386__)
	if (boot_cpu_data.x86 == 3)
		return 0;	/* No cmpxchg on a 386 */
#endif
#if defined(__sparc__) && !defined(__sparc_v9__)
	return 0;		/* No cmpxchg before v9 sparc. */
#endif
	return 1;
}

/**
 * Called whenever a process opens /dev/drm.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param dev device.
 * \return zero on success or a negative number on failure.
 *
 * Creates and initializes a drm_file structure for the file private data in \p
 * filp and add it into the double linked list in \p dev.
 */
static int drm_open_helper(struct inode *inode, struct file *filp,
			   struct drm_device * dev)
{
	int minor = iminor(inode);
	struct drm_file *priv;
	int ret;

	if (filp->f_flags & O_EXCL)
		return -EBUSY;	/* No exclusive opens */
	if (!drm_cpu_valid())
		return -EINVAL;

	DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);

	priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
	if (!priv)
		return -ENOMEM;

	memset(priv, 0, sizeof(*priv));
	filp->private_data = priv;
	priv->uid = current->euid;
	priv->pid = current->pid;
	priv->minor = minor;
	priv->head = drm_heads[minor];
	priv->ioctl_count = 0;
	/* for compatibility root is always authenticated */
	priv->authenticated = capable(CAP_SYS_ADMIN);
	priv->lock_count = 0;

	INIT_LIST_HEAD(&priv->lhead);

	if (dev->driver->open) {
		ret = dev->driver->open(dev, priv);
		if (ret < 0)
			goto out_free;
	}

	mutex_lock(&dev->struct_mutex);
	if (list_empty(&dev->filelist))
		priv->master = 1;

	list_add(&priv->lhead, &dev->filelist);
	mutex_unlock(&dev->struct_mutex);

#ifdef __alpha__
	/*
	 * Default the hose
	 */
	if (!dev->hose) {
		struct pci_dev *pci_dev;
		pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
		if (pci_dev) {
			dev->hose = pci_dev->sysdata;
			pci_dev_put(pci_dev);
		}
		if (!dev->hose) {
			struct pci_bus *b = pci_bus_b(pci_root_buses.next);
			if (b)
				dev->hose = b->sysdata;
		}
	}
#endif

	return 0;
      out_free:
	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
	filp->private_data = NULL;
	return ret;
}

/** No-op. */
int drm_fasync(int fd, struct file *filp, int on)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->head->dev;
	int retcode;

	DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
		  (long)old_encode_dev(priv->head->device));
	retcode = fasync_helper(fd, filp, on, &dev->buf_async);
	if (retcode < 0)
		return retcode;
	return 0;
}
EXPORT_SYMBOL(drm_fasync);

/**
 * Release file.
 *
 * \param inode device inode
 * \param filp file pointer.
 * \return zero on success or a negative number on failure.
 *
 * If the hardware lock is held then free it, and take it again for the kernel
 * context since it's necessary to reclaim buffers. Unlink the file private
 * data from its list and free it. Decreases the open count and if it reaches
 * zero calls drm_lastclose().
 */
int drm_release(struct inode *inode, struct file *filp)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev;
	int retcode = 0;

	lock_kernel();
	dev = priv->head->dev;

	DRM_DEBUG("open_count = %d\n", dev->open_count);

	if (dev->driver->preclose)
		dev->driver->preclose(dev, filp);

	/* ========================================================
	 * Begin inline drm_release
	 */

	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
		  current->pid, (long)old_encode_dev(priv->head->device),
		  dev->open_count);

	if (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) {
		if (drm_i_have_hw_lock(filp)) {
			dev->driver->reclaim_buffers_locked(dev, filp);
		} else {
			unsigned long _end=jiffies + 3*DRM_HZ;
			int locked = 0;

			drm_idlelock_take(&dev->lock);

			/*
			 * Wait for a while.
			 */

			do{
				spin_lock(&dev->lock.spinlock);
				locked = dev->lock.idle_has_lock;
				spin_unlock(&dev->lock.spinlock);
				if (locked)
					break;
				schedule();
			} while (!time_after_eq(jiffies, _end));

			if (!locked) {
				DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
					  "\tdriver to use reclaim_buffers_idlelocked() instead.\n"
					  "\tI will go on reclaiming the buffers anyway.\n");
			}

			dev->driver->reclaim_buffers_locked(dev, filp);
			drm_idlelock_release(&dev->lock);
		}
	}

	if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) {

		drm_idlelock_take(&dev->lock);
		dev->driver->reclaim_buffers_idlelocked(dev, filp);
		drm_idlelock_release(&dev->lock);

	}

	if (drm_i_have_hw_lock(filp)) {
		DRM_DEBUG("File %p released, freeing lock for context %d\n",
			  filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));

		drm_lock_free(&dev->lock,
			      _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
	}


	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
	    !dev->driver->reclaim_buffers_locked) {
		dev->driver->reclaim_buffers(dev, filp);
	}

	drm_fasync(-1, filp, 0);

	mutex_lock(&dev->ctxlist_mutex);
	if (!list_empty(&dev->ctxlist)) {
		struct drm_ctx_list *pos, *n;

		list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
			if (pos->tag == priv &&
			    pos->handle != DRM_KERNEL_CONTEXT) {
				if (dev->driver->context_dtor)
					dev->driver->context_dtor(dev,
								  pos->handle);

				drm_ctxbitmap_free(dev, pos->handle);

				list_del(&pos->head);
				drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
				--dev->ctx_count;
			}
		}
	}
	mutex_unlock(&dev->ctxlist_mutex);

	mutex_lock(&dev->struct_mutex);
	if (priv->remove_auth_on_close == 1) {
		struct drm_file *temp;

		list_for_each_entry(temp, &dev->filelist, lhead)
			temp->authenticated = 0;
	}
	list_del(&priv->lhead);
	mutex_unlock(&dev->struct_mutex);

	if (dev->driver->postclose)
		dev->driver->postclose(dev, priv);
	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);

	/* ========================================================
	 * End inline drm_release
	 */

	atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
	spin_lock(&dev->count_lock);
	if (!--dev->open_count) {
		if (atomic_read(&dev->ioctl_count) || dev->blocked) {
			DRM_ERROR("Device busy: %d %d\n",
				  atomic_read(&dev->ioctl_count), dev->blocked);
			spin_unlock(&dev->count_lock);
			unlock_kernel();
			return -EBUSY;
		}
		spin_unlock(&dev->count_lock);
		unlock_kernel();
		return drm_lastclose(dev);
	}
	spin_unlock(&dev->count_lock);

	unlock_kernel();

	return retcode;
}
EXPORT_SYMBOL(drm_release);

/** No-op. */
unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
{
	return 0;
}
EXPORT_SYMBOL(drm_poll);