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Commit | Line | Data |
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1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_fops.c |
1da177e4 | 3 | * File operations for DRM |
b5e89ed5 | 4 | * |
1da177e4 LT |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
6 | * \author Daryll Strauss <daryll@valinux.com> | |
7 | * \author Gareth Hughes <gareth@valinux.com> | |
8 | */ | |
9 | ||
10 | /* | |
11 | * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com | |
12 | * | |
13 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
14 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
15 | * All Rights Reserved. | |
16 | * | |
17 | * Permission is hereby granted, free of charge, to any person obtaining a | |
18 | * copy of this software and associated documentation files (the "Software"), | |
19 | * to deal in the Software without restriction, including without limitation | |
20 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
21 | * and/or sell copies of the Software, and to permit persons to whom the | |
22 | * Software is furnished to do so, subject to the following conditions: | |
23 | * | |
24 | * The above copyright notice and this permission notice (including the next | |
25 | * paragraph) shall be included in all copies or substantial portions of the | |
26 | * Software. | |
27 | * | |
28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
29 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
30 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
31 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
32 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
33 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
34 | * OTHER DEALINGS IN THE SOFTWARE. | |
35 | */ | |
36 | ||
37 | #include "drmP.h" | |
d985c108 | 38 | #include "drm_sarea.h" |
1da177e4 LT |
39 | #include <linux/poll.h> |
40 | ||
b5e89ed5 DA |
41 | static int drm_open_helper(struct inode *inode, struct file *filp, |
42 | drm_device_t * dev); | |
c94f7029 | 43 | |
b5e89ed5 | 44 | static int drm_setup(drm_device_t * dev) |
1da177e4 | 45 | { |
d985c108 | 46 | drm_local_map_t *map; |
1da177e4 LT |
47 | int i; |
48 | int ret; | |
49 | ||
22eae947 DA |
50 | if (dev->driver->firstopen) { |
51 | ret = dev->driver->firstopen(dev); | |
b5e89ed5 | 52 | if (ret != 0) |
1da177e4 LT |
53 | return ret; |
54 | } | |
55 | ||
d985c108 DA |
56 | /* prebuild the SAREA */ |
57 | i = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM, _DRM_CONTAINS_LOCK, &map); | |
58 | if (i != 0) | |
59 | return i; | |
60 | ||
b5e89ed5 DA |
61 | atomic_set(&dev->ioctl_count, 0); |
62 | atomic_set(&dev->vma_count, 0); | |
1da177e4 | 63 | dev->buf_use = 0; |
b5e89ed5 | 64 | atomic_set(&dev->buf_alloc, 0); |
1da177e4 | 65 | |
b5e89ed5 DA |
66 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) { |
67 | i = drm_dma_setup(dev); | |
68 | if (i < 0) | |
1da177e4 LT |
69 | return i; |
70 | } | |
71 | ||
b5e89ed5 DA |
72 | for (i = 0; i < DRM_ARRAY_SIZE(dev->counts); i++) |
73 | atomic_set(&dev->counts[i], 0); | |
1da177e4 | 74 | |
b5e89ed5 | 75 | for (i = 0; i < DRM_HASH_SIZE; i++) { |
1da177e4 LT |
76 | dev->magiclist[i].head = NULL; |
77 | dev->magiclist[i].tail = NULL; | |
78 | } | |
79 | ||
b5e89ed5 DA |
80 | dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST); |
81 | if (dev->ctxlist == NULL) | |
82 | return -ENOMEM; | |
1da177e4 LT |
83 | memset(dev->ctxlist, 0, sizeof(*dev->ctxlist)); |
84 | INIT_LIST_HEAD(&dev->ctxlist->head); | |
85 | ||
86 | dev->vmalist = NULL; | |
87 | dev->sigdata.lock = dev->lock.hw_lock = NULL; | |
b5e89ed5 | 88 | init_waitqueue_head(&dev->lock.lock_queue); |
1da177e4 LT |
89 | dev->queue_count = 0; |
90 | dev->queue_reserved = 0; | |
91 | dev->queue_slots = 0; | |
92 | dev->queuelist = NULL; | |
93 | dev->irq_enabled = 0; | |
94 | dev->context_flag = 0; | |
95 | dev->interrupt_flag = 0; | |
96 | dev->dma_flag = 0; | |
97 | dev->last_context = 0; | |
98 | dev->last_switch = 0; | |
99 | dev->last_checked = 0; | |
b5e89ed5 | 100 | init_waitqueue_head(&dev->context_wait); |
1da177e4 LT |
101 | dev->if_version = 0; |
102 | ||
103 | dev->ctx_start = 0; | |
104 | dev->lck_start = 0; | |
105 | ||
1da177e4 | 106 | dev->buf_async = NULL; |
b5e89ed5 DA |
107 | init_waitqueue_head(&dev->buf_readers); |
108 | init_waitqueue_head(&dev->buf_writers); | |
1da177e4 | 109 | |
b5e89ed5 | 110 | DRM_DEBUG("\n"); |
1da177e4 LT |
111 | |
112 | /* | |
113 | * The kernel's context could be created here, but is now created | |
b5e89ed5 | 114 | * in drm_dma_enqueue. This is more resource-efficient for |
1da177e4 LT |
115 | * hardware that does not do DMA, but may mean that |
116 | * drm_select_queue fails between the time the interrupt is | |
117 | * initialized and the time the queues are initialized. | |
118 | */ | |
1da177e4 LT |
119 | |
120 | return 0; | |
121 | } | |
122 | ||
123 | /** | |
124 | * Open file. | |
b5e89ed5 | 125 | * |
1da177e4 LT |
126 | * \param inode device inode |
127 | * \param filp file pointer. | |
128 | * \return zero on success or a negative number on failure. | |
129 | * | |
130 | * Searches the DRM device with the same minor number, calls open_helper(), and | |
131 | * increments the device open count. If the open count was previous at zero, | |
132 | * i.e., it's the first that the device is open, then calls setup(). | |
133 | */ | |
b5e89ed5 | 134 | int drm_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
135 | { |
136 | drm_device_t *dev = NULL; | |
137 | int minor = iminor(inode); | |
138 | int retcode = 0; | |
139 | ||
140 | if (!((minor >= 0) && (minor < drm_cards_limit))) | |
141 | return -ENODEV; | |
b5e89ed5 | 142 | |
1da177e4 LT |
143 | if (!drm_heads[minor]) |
144 | return -ENODEV; | |
145 | ||
146 | if (!(dev = drm_heads[minor]->dev)) | |
147 | return -ENODEV; | |
b5e89ed5 DA |
148 | |
149 | retcode = drm_open_helper(inode, filp, dev); | |
150 | if (!retcode) { | |
151 | atomic_inc(&dev->counts[_DRM_STAT_OPENS]); | |
152 | spin_lock(&dev->count_lock); | |
153 | if (!dev->open_count++) { | |
154 | spin_unlock(&dev->count_lock); | |
155 | return drm_setup(dev); | |
1da177e4 | 156 | } |
b5e89ed5 | 157 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
158 | } |
159 | ||
160 | return retcode; | |
161 | } | |
162 | EXPORT_SYMBOL(drm_open); | |
163 | ||
d985c108 DA |
164 | /** |
165 | * File \c open operation. | |
166 | * | |
167 | * \param inode device inode. | |
168 | * \param filp file pointer. | |
169 | * | |
170 | * Puts the dev->fops corresponding to the device minor number into | |
171 | * \p filp, call the \c open method, and restore the file operations. | |
172 | */ | |
173 | int drm_stub_open(struct inode *inode, struct file *filp) | |
174 | { | |
175 | drm_device_t *dev = NULL; | |
176 | int minor = iminor(inode); | |
177 | int err = -ENODEV; | |
178 | struct file_operations *old_fops; | |
179 | ||
180 | DRM_DEBUG("\n"); | |
181 | ||
182 | if (!((minor >= 0) && (minor < drm_cards_limit))) | |
183 | return -ENODEV; | |
184 | ||
185 | if (!drm_heads[minor]) | |
186 | return -ENODEV; | |
187 | ||
188 | if (!(dev = drm_heads[minor]->dev)) | |
189 | return -ENODEV; | |
190 | ||
191 | old_fops = filp->f_op; | |
192 | filp->f_op = fops_get(&dev->driver->fops); | |
193 | if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { | |
194 | fops_put(filp->f_op); | |
195 | filp->f_op = fops_get(old_fops); | |
196 | } | |
197 | fops_put(old_fops); | |
198 | ||
199 | return err; | |
200 | } | |
201 | ||
202 | /** | |
203 | * Check whether DRI will run on this CPU. | |
204 | * | |
205 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. | |
206 | */ | |
207 | static int drm_cpu_valid(void) | |
208 | { | |
209 | #if defined(__i386__) | |
210 | if (boot_cpu_data.x86 == 3) | |
211 | return 0; /* No cmpxchg on a 386 */ | |
212 | #endif | |
213 | #if defined(__sparc__) && !defined(__sparc_v9__) | |
214 | return 0; /* No cmpxchg before v9 sparc. */ | |
215 | #endif | |
216 | return 1; | |
217 | } | |
218 | ||
219 | /** | |
220 | * Called whenever a process opens /dev/drm. | |
221 | * | |
222 | * \param inode device inode. | |
223 | * \param filp file pointer. | |
224 | * \param dev device. | |
225 | * \return zero on success or a negative number on failure. | |
226 | * | |
227 | * Creates and initializes a drm_file structure for the file private data in \p | |
228 | * filp and add it into the double linked list in \p dev. | |
229 | */ | |
230 | static int drm_open_helper(struct inode *inode, struct file *filp, | |
231 | drm_device_t * dev) | |
232 | { | |
233 | int minor = iminor(inode); | |
234 | drm_file_t *priv; | |
235 | int ret; | |
236 | ||
237 | if (filp->f_flags & O_EXCL) | |
238 | return -EBUSY; /* No exclusive opens */ | |
239 | if (!drm_cpu_valid()) | |
240 | return -EINVAL; | |
241 | ||
242 | DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor); | |
243 | ||
244 | priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); | |
245 | if (!priv) | |
246 | return -ENOMEM; | |
247 | ||
248 | memset(priv, 0, sizeof(*priv)); | |
249 | filp->private_data = priv; | |
250 | priv->uid = current->euid; | |
251 | priv->pid = current->pid; | |
252 | priv->minor = minor; | |
253 | priv->head = drm_heads[minor]; | |
254 | priv->ioctl_count = 0; | |
255 | /* for compatibility root is always authenticated */ | |
256 | priv->authenticated = capable(CAP_SYS_ADMIN); | |
257 | priv->lock_count = 0; | |
258 | ||
259 | if (dev->driver->open) { | |
260 | ret = dev->driver->open(dev, priv); | |
261 | if (ret < 0) | |
262 | goto out_free; | |
263 | } | |
264 | ||
265 | down(&dev->struct_sem); | |
266 | if (!dev->file_last) { | |
267 | priv->next = NULL; | |
268 | priv->prev = NULL; | |
269 | dev->file_first = priv; | |
270 | dev->file_last = priv; | |
271 | /* first opener automatically becomes master */ | |
272 | priv->master = 1; | |
273 | } else { | |
274 | priv->next = NULL; | |
275 | priv->prev = dev->file_last; | |
276 | dev->file_last->next = priv; | |
277 | dev->file_last = priv; | |
278 | } | |
279 | up(&dev->struct_sem); | |
280 | ||
281 | #ifdef __alpha__ | |
282 | /* | |
283 | * Default the hose | |
284 | */ | |
285 | if (!dev->hose) { | |
286 | struct pci_dev *pci_dev; | |
287 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
288 | if (pci_dev) { | |
289 | dev->hose = pci_dev->sysdata; | |
290 | pci_dev_put(pci_dev); | |
291 | } | |
292 | if (!dev->hose) { | |
293 | struct pci_bus *b = pci_bus_b(pci_root_buses.next); | |
294 | if (b) | |
295 | dev->hose = b->sysdata; | |
296 | } | |
297 | } | |
298 | #endif | |
299 | ||
300 | return 0; | |
301 | out_free: | |
302 | drm_free(priv, sizeof(*priv), DRM_MEM_FILES); | |
303 | filp->private_data = NULL; | |
304 | return ret; | |
305 | } | |
306 | ||
307 | /** No-op. */ | |
308 | int drm_fasync(int fd, struct file *filp, int on) | |
309 | { | |
310 | drm_file_t *priv = filp->private_data; | |
311 | drm_device_t *dev = priv->head->dev; | |
312 | int retcode; | |
313 | ||
314 | DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, | |
315 | (long)old_encode_dev(priv->head->device)); | |
316 | retcode = fasync_helper(fd, filp, on, &dev->buf_async); | |
317 | if (retcode < 0) | |
318 | return retcode; | |
319 | return 0; | |
320 | } | |
321 | EXPORT_SYMBOL(drm_fasync); | |
322 | ||
1da177e4 LT |
323 | /** |
324 | * Release file. | |
325 | * | |
326 | * \param inode device inode | |
327 | * \param filp file pointer. | |
328 | * \return zero on success or a negative number on failure. | |
329 | * | |
330 | * If the hardware lock is held then free it, and take it again for the kernel | |
331 | * context since it's necessary to reclaim buffers. Unlink the file private | |
332 | * data from its list and free it. Decreases the open count and if it reaches | |
22eae947 | 333 | * zero calls drm_lastclose(). |
1da177e4 | 334 | */ |
b5e89ed5 | 335 | int drm_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
336 | { |
337 | drm_file_t *priv = filp->private_data; | |
338 | drm_device_t *dev; | |
339 | int retcode = 0; | |
340 | ||
341 | lock_kernel(); | |
342 | dev = priv->head->dev; | |
343 | ||
b5e89ed5 | 344 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
1da177e4 | 345 | |
22eae947 DA |
346 | if (dev->driver->preclose) |
347 | dev->driver->preclose(dev, filp); | |
1da177e4 LT |
348 | |
349 | /* ======================================================== | |
350 | * Begin inline drm_release | |
351 | */ | |
352 | ||
b5e89ed5 DA |
353 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
354 | current->pid, (long)old_encode_dev(priv->head->device), | |
355 | dev->open_count); | |
356 | ||
357 | if (priv->lock_count && dev->lock.hw_lock && | |
358 | _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) && | |
359 | dev->lock.filp == filp) { | |
360 | DRM_DEBUG("File %p released, freeing lock for context %d\n", | |
361 | filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
1da177e4 | 362 | |
22eae947 DA |
363 | if (dev->driver->reclaim_buffers_locked) |
364 | dev->driver->reclaim_buffers_locked(dev, filp); | |
1da177e4 | 365 | |
b5e89ed5 DA |
366 | drm_lock_free(dev, &dev->lock.hw_lock->lock, |
367 | _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
1da177e4 | 368 | |
b5e89ed5 DA |
369 | /* FIXME: may require heavy-handed reset of |
370 | hardware at this point, possibly | |
371 | processed via a callback to the X | |
372 | server. */ | |
22eae947 | 373 | } else if (dev->driver->reclaim_buffers_locked && priv->lock_count |
b5e89ed5 | 374 | && dev->lock.hw_lock) { |
1da177e4 | 375 | /* The lock is required to reclaim buffers */ |
b5e89ed5 | 376 | DECLARE_WAITQUEUE(entry, current); |
1da177e4 | 377 | |
b5e89ed5 | 378 | add_wait_queue(&dev->lock.lock_queue, &entry); |
1da177e4 LT |
379 | for (;;) { |
380 | __set_current_state(TASK_INTERRUPTIBLE); | |
b5e89ed5 | 381 | if (!dev->lock.hw_lock) { |
1da177e4 LT |
382 | /* Device has been unregistered */ |
383 | retcode = -EINTR; | |
384 | break; | |
385 | } | |
b5e89ed5 DA |
386 | if (drm_lock_take(&dev->lock.hw_lock->lock, |
387 | DRM_KERNEL_CONTEXT)) { | |
388 | dev->lock.filp = filp; | |
1da177e4 | 389 | dev->lock.lock_time = jiffies; |
b5e89ed5 | 390 | atomic_inc(&dev->counts[_DRM_STAT_LOCKS]); |
1da177e4 LT |
391 | break; /* Got lock */ |
392 | } | |
b5e89ed5 | 393 | /* Contention */ |
1da177e4 | 394 | schedule(); |
b5e89ed5 | 395 | if (signal_pending(current)) { |
1da177e4 LT |
396 | retcode = -ERESTARTSYS; |
397 | break; | |
398 | } | |
399 | } | |
400 | __set_current_state(TASK_RUNNING); | |
b5e89ed5 DA |
401 | remove_wait_queue(&dev->lock.lock_queue, &entry); |
402 | if (!retcode) { | |
22eae947 | 403 | dev->driver->reclaim_buffers_locked(dev, filp); |
b5e89ed5 DA |
404 | drm_lock_free(dev, &dev->lock.hw_lock->lock, |
405 | DRM_KERNEL_CONTEXT); | |
1da177e4 LT |
406 | } |
407 | } | |
b5e89ed5 | 408 | |
22eae947 DA |
409 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && |
410 | !dev->driver->reclaim_buffers_locked) { | |
1da177e4 LT |
411 | dev->driver->reclaim_buffers(dev, filp); |
412 | } | |
413 | ||
b5e89ed5 | 414 | drm_fasync(-1, filp, 0); |
1da177e4 | 415 | |
b5e89ed5 DA |
416 | down(&dev->ctxlist_sem); |
417 | if (dev->ctxlist && (!list_empty(&dev->ctxlist->head))) { | |
1da177e4 LT |
418 | drm_ctx_list_t *pos, *n; |
419 | ||
b5e89ed5 DA |
420 | list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) { |
421 | if (pos->tag == priv && | |
422 | pos->handle != DRM_KERNEL_CONTEXT) { | |
1da177e4 | 423 | if (dev->driver->context_dtor) |
b5e89ed5 DA |
424 | dev->driver->context_dtor(dev, |
425 | pos->handle); | |
1da177e4 | 426 | |
b5e89ed5 | 427 | drm_ctxbitmap_free(dev, pos->handle); |
1da177e4 | 428 | |
b5e89ed5 DA |
429 | list_del(&pos->head); |
430 | drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); | |
1da177e4 LT |
431 | --dev->ctx_count; |
432 | } | |
433 | } | |
434 | } | |
b5e89ed5 | 435 | up(&dev->ctxlist_sem); |
1da177e4 | 436 | |
b5e89ed5 DA |
437 | down(&dev->struct_sem); |
438 | if (priv->remove_auth_on_close == 1) { | |
1da177e4 | 439 | drm_file_t *temp = dev->file_first; |
b5e89ed5 | 440 | while (temp) { |
1da177e4 LT |
441 | temp->authenticated = 0; |
442 | temp = temp->next; | |
443 | } | |
444 | } | |
b5e89ed5 | 445 | if (priv->prev) { |
1da177e4 LT |
446 | priv->prev->next = priv->next; |
447 | } else { | |
b5e89ed5 | 448 | dev->file_first = priv->next; |
1da177e4 | 449 | } |
b5e89ed5 | 450 | if (priv->next) { |
1da177e4 LT |
451 | priv->next->prev = priv->prev; |
452 | } else { | |
b5e89ed5 | 453 | dev->file_last = priv->prev; |
1da177e4 | 454 | } |
b5e89ed5 DA |
455 | up(&dev->struct_sem); |
456 | ||
22eae947 DA |
457 | if (dev->driver->postclose) |
458 | dev->driver->postclose(dev, priv); | |
b5e89ed5 | 459 | drm_free(priv, sizeof(*priv), DRM_MEM_FILES); |
1da177e4 LT |
460 | |
461 | /* ======================================================== | |
462 | * End inline drm_release | |
463 | */ | |
464 | ||
b5e89ed5 DA |
465 | atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); |
466 | spin_lock(&dev->count_lock); | |
467 | if (!--dev->open_count) { | |
468 | if (atomic_read(&dev->ioctl_count) || dev->blocked) { | |
469 | DRM_ERROR("Device busy: %d %d\n", | |
470 | atomic_read(&dev->ioctl_count), dev->blocked); | |
471 | spin_unlock(&dev->count_lock); | |
1da177e4 LT |
472 | unlock_kernel(); |
473 | return -EBUSY; | |
474 | } | |
b5e89ed5 | 475 | spin_unlock(&dev->count_lock); |
1da177e4 | 476 | unlock_kernel(); |
22eae947 | 477 | return drm_lastclose(dev); |
1da177e4 | 478 | } |
b5e89ed5 | 479 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
480 | |
481 | unlock_kernel(); | |
482 | ||
483 | return retcode; | |
484 | } | |
485 | EXPORT_SYMBOL(drm_release); | |
486 | ||
1da177e4 LT |
487 | /** No-op. */ |
488 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) | |
489 | { | |
490 | return 0; | |
491 | } | |
b5e89ed5 | 492 | EXPORT_SYMBOL(drm_poll); |