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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; | |
11d9c2fd | 49 | u32 sareapage; |
1da177e4 | 50 | |
22eae947 DA |
51 | if (dev->driver->firstopen) { |
52 | ret = dev->driver->firstopen(dev); | |
b5e89ed5 | 53 | if (ret != 0) |
1da177e4 LT |
54 | return ret; |
55 | } | |
56 | ||
1f4eccfd TH |
57 | dev->magicfree.next = NULL; |
58 | ||
d985c108 | 59 | /* prebuild the SAREA */ |
4b560fde | 60 | sareapage = max_t(unsigned, SAREA_MAX, PAGE_SIZE); |
11d9c2fd | 61 | i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map); |
d985c108 DA |
62 | if (i != 0) |
63 | return i; | |
64 | ||
b5e89ed5 DA |
65 | atomic_set(&dev->ioctl_count, 0); |
66 | atomic_set(&dev->vma_count, 0); | |
1da177e4 | 67 | dev->buf_use = 0; |
b5e89ed5 | 68 | atomic_set(&dev->buf_alloc, 0); |
1da177e4 | 69 | |
b5e89ed5 DA |
70 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) { |
71 | i = drm_dma_setup(dev); | |
72 | if (i < 0) | |
1da177e4 LT |
73 | return i; |
74 | } | |
75 | ||
3d77461e | 76 | for (i = 0; i < ARRAY_SIZE(dev->counts); i++) |
b5e89ed5 | 77 | atomic_set(&dev->counts[i], 0); |
1da177e4 | 78 | |
8669cbc5 TH |
79 | drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER); |
80 | INIT_LIST_HEAD(&dev->magicfree); | |
1da177e4 | 81 | |
b5e89ed5 DA |
82 | dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST); |
83 | if (dev->ctxlist == NULL) | |
84 | return -ENOMEM; | |
1da177e4 LT |
85 | memset(dev->ctxlist, 0, sizeof(*dev->ctxlist)); |
86 | INIT_LIST_HEAD(&dev->ctxlist->head); | |
87 | ||
88 | dev->vmalist = NULL; | |
11d9c2fd | 89 | dev->sigdata.lock = NULL; |
b5e89ed5 | 90 | init_waitqueue_head(&dev->lock.lock_queue); |
1da177e4 LT |
91 | dev->queue_count = 0; |
92 | dev->queue_reserved = 0; | |
93 | dev->queue_slots = 0; | |
94 | dev->queuelist = NULL; | |
95 | dev->irq_enabled = 0; | |
96 | dev->context_flag = 0; | |
97 | dev->interrupt_flag = 0; | |
98 | dev->dma_flag = 0; | |
99 | dev->last_context = 0; | |
100 | dev->last_switch = 0; | |
101 | dev->last_checked = 0; | |
b5e89ed5 | 102 | init_waitqueue_head(&dev->context_wait); |
1da177e4 LT |
103 | dev->if_version = 0; |
104 | ||
105 | dev->ctx_start = 0; | |
106 | dev->lck_start = 0; | |
107 | ||
1da177e4 | 108 | dev->buf_async = NULL; |
b5e89ed5 DA |
109 | init_waitqueue_head(&dev->buf_readers); |
110 | init_waitqueue_head(&dev->buf_writers); | |
1da177e4 | 111 | |
b5e89ed5 | 112 | DRM_DEBUG("\n"); |
1da177e4 LT |
113 | |
114 | /* | |
115 | * The kernel's context could be created here, but is now created | |
b5e89ed5 | 116 | * in drm_dma_enqueue. This is more resource-efficient for |
1da177e4 LT |
117 | * hardware that does not do DMA, but may mean that |
118 | * drm_select_queue fails between the time the interrupt is | |
119 | * initialized and the time the queues are initialized. | |
120 | */ | |
1da177e4 LT |
121 | |
122 | return 0; | |
123 | } | |
124 | ||
125 | /** | |
126 | * Open file. | |
b5e89ed5 | 127 | * |
1da177e4 LT |
128 | * \param inode device inode |
129 | * \param filp file pointer. | |
130 | * \return zero on success or a negative number on failure. | |
131 | * | |
132 | * Searches the DRM device with the same minor number, calls open_helper(), and | |
133 | * increments the device open count. If the open count was previous at zero, | |
134 | * i.e., it's the first that the device is open, then calls setup(). | |
135 | */ | |
b5e89ed5 | 136 | int drm_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
137 | { |
138 | drm_device_t *dev = NULL; | |
139 | int minor = iminor(inode); | |
140 | int retcode = 0; | |
141 | ||
142 | if (!((minor >= 0) && (minor < drm_cards_limit))) | |
143 | return -ENODEV; | |
b5e89ed5 | 144 | |
1da177e4 LT |
145 | if (!drm_heads[minor]) |
146 | return -ENODEV; | |
147 | ||
148 | if (!(dev = drm_heads[minor]->dev)) | |
149 | return -ENODEV; | |
b5e89ed5 DA |
150 | |
151 | retcode = drm_open_helper(inode, filp, dev); | |
152 | if (!retcode) { | |
153 | atomic_inc(&dev->counts[_DRM_STAT_OPENS]); | |
154 | spin_lock(&dev->count_lock); | |
155 | if (!dev->open_count++) { | |
156 | spin_unlock(&dev->count_lock); | |
157 | return drm_setup(dev); | |
1da177e4 | 158 | } |
b5e89ed5 | 159 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
160 | } |
161 | ||
162 | return retcode; | |
163 | } | |
164 | EXPORT_SYMBOL(drm_open); | |
165 | ||
d985c108 DA |
166 | /** |
167 | * File \c open operation. | |
168 | * | |
169 | * \param inode device inode. | |
170 | * \param filp file pointer. | |
171 | * | |
172 | * Puts the dev->fops corresponding to the device minor number into | |
173 | * \p filp, call the \c open method, and restore the file operations. | |
174 | */ | |
175 | int drm_stub_open(struct inode *inode, struct file *filp) | |
176 | { | |
177 | drm_device_t *dev = NULL; | |
178 | int minor = iminor(inode); | |
179 | int err = -ENODEV; | |
99ac48f5 | 180 | const struct file_operations *old_fops; |
d985c108 DA |
181 | |
182 | DRM_DEBUG("\n"); | |
183 | ||
184 | if (!((minor >= 0) && (minor < drm_cards_limit))) | |
185 | return -ENODEV; | |
186 | ||
187 | if (!drm_heads[minor]) | |
188 | return -ENODEV; | |
189 | ||
190 | if (!(dev = drm_heads[minor]->dev)) | |
191 | return -ENODEV; | |
192 | ||
193 | old_fops = filp->f_op; | |
194 | filp->f_op = fops_get(&dev->driver->fops); | |
195 | if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { | |
196 | fops_put(filp->f_op); | |
197 | filp->f_op = fops_get(old_fops); | |
198 | } | |
199 | fops_put(old_fops); | |
200 | ||
201 | return err; | |
202 | } | |
203 | ||
204 | /** | |
205 | * Check whether DRI will run on this CPU. | |
206 | * | |
207 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. | |
208 | */ | |
209 | static int drm_cpu_valid(void) | |
210 | { | |
211 | #if defined(__i386__) | |
212 | if (boot_cpu_data.x86 == 3) | |
213 | return 0; /* No cmpxchg on a 386 */ | |
214 | #endif | |
215 | #if defined(__sparc__) && !defined(__sparc_v9__) | |
216 | return 0; /* No cmpxchg before v9 sparc. */ | |
217 | #endif | |
218 | return 1; | |
219 | } | |
220 | ||
221 | /** | |
222 | * Called whenever a process opens /dev/drm. | |
223 | * | |
224 | * \param inode device inode. | |
225 | * \param filp file pointer. | |
226 | * \param dev device. | |
227 | * \return zero on success or a negative number on failure. | |
228 | * | |
229 | * Creates and initializes a drm_file structure for the file private data in \p | |
230 | * filp and add it into the double linked list in \p dev. | |
231 | */ | |
232 | static int drm_open_helper(struct inode *inode, struct file *filp, | |
233 | drm_device_t * dev) | |
234 | { | |
235 | int minor = iminor(inode); | |
236 | drm_file_t *priv; | |
237 | int ret; | |
238 | ||
239 | if (filp->f_flags & O_EXCL) | |
240 | return -EBUSY; /* No exclusive opens */ | |
241 | if (!drm_cpu_valid()) | |
242 | return -EINVAL; | |
243 | ||
244 | DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor); | |
245 | ||
246 | priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); | |
247 | if (!priv) | |
248 | return -ENOMEM; | |
249 | ||
250 | memset(priv, 0, sizeof(*priv)); | |
251 | filp->private_data = priv; | |
252 | priv->uid = current->euid; | |
253 | priv->pid = current->pid; | |
254 | priv->minor = minor; | |
255 | priv->head = drm_heads[minor]; | |
256 | priv->ioctl_count = 0; | |
257 | /* for compatibility root is always authenticated */ | |
258 | priv->authenticated = capable(CAP_SYS_ADMIN); | |
259 | priv->lock_count = 0; | |
260 | ||
261 | if (dev->driver->open) { | |
262 | ret = dev->driver->open(dev, priv); | |
263 | if (ret < 0) | |
264 | goto out_free; | |
265 | } | |
266 | ||
30e2fb18 | 267 | mutex_lock(&dev->struct_mutex); |
d985c108 DA |
268 | if (!dev->file_last) { |
269 | priv->next = NULL; | |
270 | priv->prev = NULL; | |
271 | dev->file_first = priv; | |
272 | dev->file_last = priv; | |
273 | /* first opener automatically becomes master */ | |
274 | priv->master = 1; | |
275 | } else { | |
276 | priv->next = NULL; | |
277 | priv->prev = dev->file_last; | |
278 | dev->file_last->next = priv; | |
279 | dev->file_last = priv; | |
280 | } | |
30e2fb18 | 281 | mutex_unlock(&dev->struct_mutex); |
d985c108 DA |
282 | |
283 | #ifdef __alpha__ | |
284 | /* | |
285 | * Default the hose | |
286 | */ | |
287 | if (!dev->hose) { | |
288 | struct pci_dev *pci_dev; | |
289 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
290 | if (pci_dev) { | |
291 | dev->hose = pci_dev->sysdata; | |
292 | pci_dev_put(pci_dev); | |
293 | } | |
294 | if (!dev->hose) { | |
295 | struct pci_bus *b = pci_bus_b(pci_root_buses.next); | |
296 | if (b) | |
297 | dev->hose = b->sysdata; | |
298 | } | |
299 | } | |
300 | #endif | |
301 | ||
302 | return 0; | |
303 | out_free: | |
304 | drm_free(priv, sizeof(*priv), DRM_MEM_FILES); | |
305 | filp->private_data = NULL; | |
306 | return ret; | |
307 | } | |
308 | ||
309 | /** No-op. */ | |
310 | int drm_fasync(int fd, struct file *filp, int on) | |
311 | { | |
312 | drm_file_t *priv = filp->private_data; | |
313 | drm_device_t *dev = priv->head->dev; | |
314 | int retcode; | |
315 | ||
316 | DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, | |
317 | (long)old_encode_dev(priv->head->device)); | |
318 | retcode = fasync_helper(fd, filp, on, &dev->buf_async); | |
319 | if (retcode < 0) | |
320 | return retcode; | |
321 | return 0; | |
322 | } | |
323 | EXPORT_SYMBOL(drm_fasync); | |
324 | ||
1da177e4 LT |
325 | /** |
326 | * Release file. | |
327 | * | |
328 | * \param inode device inode | |
329 | * \param filp file pointer. | |
330 | * \return zero on success or a negative number on failure. | |
331 | * | |
332 | * If the hardware lock is held then free it, and take it again for the kernel | |
333 | * context since it's necessary to reclaim buffers. Unlink the file private | |
334 | * data from its list and free it. Decreases the open count and if it reaches | |
22eae947 | 335 | * zero calls drm_lastclose(). |
1da177e4 | 336 | */ |
b5e89ed5 | 337 | int drm_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
338 | { |
339 | drm_file_t *priv = filp->private_data; | |
340 | drm_device_t *dev; | |
341 | int retcode = 0; | |
342 | ||
343 | lock_kernel(); | |
344 | dev = priv->head->dev; | |
345 | ||
b5e89ed5 | 346 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
1da177e4 | 347 | |
22eae947 DA |
348 | if (dev->driver->preclose) |
349 | dev->driver->preclose(dev, filp); | |
1da177e4 LT |
350 | |
351 | /* ======================================================== | |
352 | * Begin inline drm_release | |
353 | */ | |
354 | ||
b5e89ed5 DA |
355 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
356 | current->pid, (long)old_encode_dev(priv->head->device), | |
357 | dev->open_count); | |
358 | ||
040ac320 TH |
359 | if (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) { |
360 | if (drm_i_have_hw_lock(filp)) { | |
22eae947 | 361 | dev->driver->reclaim_buffers_locked(dev, filp); |
040ac320 TH |
362 | } else { |
363 | unsigned long _end=jiffies + 3*DRM_HZ; | |
364 | int locked = 0; | |
365 | ||
366 | drm_idlelock_take(&dev->lock); | |
367 | ||
368 | /* | |
369 | * Wait for a while. | |
370 | */ | |
371 | ||
372 | do{ | |
373 | spin_lock(&dev->lock.spinlock); | |
374 | locked = dev->lock.idle_has_lock; | |
375 | spin_unlock(&dev->lock.spinlock); | |
376 | if (locked) | |
377 | break; | |
378 | schedule(); | |
379 | } while (!time_after_eq(jiffies, _end)); | |
380 | ||
381 | if (!locked) { | |
382 | DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n" | |
383 | "\tdriver to use reclaim_buffers_idlelocked() instead.\n" | |
384 | "\tI will go on reclaiming the buffers anyway.\n"); | |
1da177e4 | 385 | } |
040ac320 | 386 | |
22eae947 | 387 | dev->driver->reclaim_buffers_locked(dev, filp); |
040ac320 | 388 | drm_idlelock_release(&dev->lock); |
1da177e4 LT |
389 | } |
390 | } | |
b5e89ed5 | 391 | |
040ac320 TH |
392 | if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) { |
393 | ||
394 | drm_idlelock_take(&dev->lock); | |
395 | dev->driver->reclaim_buffers_idlelocked(dev, filp); | |
396 | drm_idlelock_release(&dev->lock); | |
397 | ||
398 | } | |
399 | ||
400 | if (drm_i_have_hw_lock(filp)) { | |
401 | DRM_DEBUG("File %p released, freeing lock for context %d\n", | |
402 | filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
403 | ||
404 | drm_lock_free(&dev->lock, | |
405 | _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
406 | } | |
407 | ||
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 | |
30e2fb18 | 416 | mutex_lock(&dev->ctxlist_mutex); |
b5e89ed5 | 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 | } | |
30e2fb18 | 435 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 | 436 | |
30e2fb18 | 437 | mutex_lock(&dev->struct_mutex); |
b5e89ed5 | 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 | } |
30e2fb18 | 455 | mutex_unlock(&dev->struct_mutex); |
b5e89ed5 | 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); |