Commit | Line | Data |
---|---|---|
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 | ||
760285e7 | 37 | #include <drm/drmP.h> |
1da177e4 | 38 | #include <linux/poll.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
e0cd3608 | 40 | #include <linux/module.h> |
e7b96070 | 41 | #include "drm_legacy.h" |
1da177e4 | 42 | |
0d639883 | 43 | /* from BKL pushdown */ |
58374713 | 44 | DEFINE_MUTEX(drm_global_mutex); |
e3461a2b | 45 | EXPORT_SYMBOL(drm_global_mutex); |
58374713 | 46 | |
1dcc0ceb | 47 | static int drm_open_helper(struct file *filp, struct drm_minor *minor); |
c94f7029 | 48 | |
84b1fd10 | 49 | static int drm_setup(struct drm_device * dev) |
1da177e4 | 50 | { |
1da177e4 LT |
51 | int ret; |
52 | ||
7d14bb6b DV |
53 | if (dev->driver->firstopen && |
54 | !drm_core_check_feature(dev, DRIVER_MODESET)) { | |
22eae947 | 55 | ret = dev->driver->firstopen(dev); |
b5e89ed5 | 56 | if (ret != 0) |
1da177e4 LT |
57 | return ret; |
58 | } | |
59 | ||
f336ab76 DV |
60 | ret = drm_legacy_dma_setup(dev); |
61 | if (ret < 0) | |
62 | return ret; | |
1da177e4 | 63 | |
1da177e4 | 64 | |
b5e89ed5 | 65 | DRM_DEBUG("\n"); |
1da177e4 LT |
66 | return 0; |
67 | } | |
68 | ||
69 | /** | |
70 | * Open file. | |
b5e89ed5 | 71 | * |
1da177e4 LT |
72 | * \param inode device inode |
73 | * \param filp file pointer. | |
74 | * \return zero on success or a negative number on failure. | |
75 | * | |
76 | * Searches the DRM device with the same minor number, calls open_helper(), and | |
77 | * increments the device open count. If the open count was previous at zero, | |
78 | * i.e., it's the first that the device is open, then calls setup(). | |
79 | */ | |
b5e89ed5 | 80 | int drm_open(struct inode *inode, struct file *filp) |
1da177e4 | 81 | { |
1616c525 | 82 | struct drm_device *dev; |
2c14f28b | 83 | struct drm_minor *minor; |
1616c525 | 84 | int retcode; |
fdb40a08 | 85 | int need_setup = 0; |
b5e89ed5 | 86 | |
1616c525 DH |
87 | minor = drm_minor_acquire(iminor(inode)); |
88 | if (IS_ERR(minor)) | |
89 | return PTR_ERR(minor); | |
2c07a21d | 90 | |
1616c525 | 91 | dev = minor->dev; |
fdb40a08 IH |
92 | if (!dev->open_count++) |
93 | need_setup = 1; | |
fdb40a08 | 94 | |
6796cb16 DH |
95 | /* share address_space across all char-devs of a single device */ |
96 | filp->f_mapping = dev->anon_inode->i_mapping; | |
fdb40a08 | 97 | |
1dcc0ceb | 98 | retcode = drm_open_helper(filp, minor); |
fdb40a08 IH |
99 | if (retcode) |
100 | goto err_undo; | |
fdb40a08 IH |
101 | if (need_setup) { |
102 | retcode = drm_setup(dev); | |
103 | if (retcode) | |
104 | goto err_undo; | |
f453ba04 | 105 | } |
fdb40a08 | 106 | return 0; |
a2c0a97b | 107 | |
fdb40a08 | 108 | err_undo: |
fdb40a08 | 109 | dev->open_count--; |
1616c525 | 110 | drm_minor_release(minor); |
1da177e4 LT |
111 | return retcode; |
112 | } | |
113 | EXPORT_SYMBOL(drm_open); | |
114 | ||
d985c108 DA |
115 | /** |
116 | * Check whether DRI will run on this CPU. | |
117 | * | |
118 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. | |
119 | */ | |
120 | static int drm_cpu_valid(void) | |
121 | { | |
d985c108 DA |
122 | #if defined(__sparc__) && !defined(__sparc_v9__) |
123 | return 0; /* No cmpxchg before v9 sparc. */ | |
124 | #endif | |
125 | return 1; | |
126 | } | |
127 | ||
128 | /** | |
129 | * Called whenever a process opens /dev/drm. | |
130 | * | |
d985c108 | 131 | * \param filp file pointer. |
f4aede2e | 132 | * \param minor acquired minor-object. |
d985c108 DA |
133 | * \return zero on success or a negative number on failure. |
134 | * | |
135 | * Creates and initializes a drm_file structure for the file private data in \p | |
136 | * filp and add it into the double linked list in \p dev. | |
137 | */ | |
1dcc0ceb | 138 | static int drm_open_helper(struct file *filp, struct drm_minor *minor) |
d985c108 | 139 | { |
f4aede2e | 140 | struct drm_device *dev = minor->dev; |
84b1fd10 | 141 | struct drm_file *priv; |
d985c108 DA |
142 | int ret; |
143 | ||
144 | if (filp->f_flags & O_EXCL) | |
145 | return -EBUSY; /* No exclusive opens */ | |
146 | if (!drm_cpu_valid()) | |
147 | return -EINVAL; | |
13bb9cc8 | 148 | if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF) |
5bcf719b | 149 | return -EINVAL; |
d985c108 | 150 | |
f4aede2e | 151 | DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index); |
d985c108 | 152 | |
6ebc22e6 | 153 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
d985c108 DA |
154 | if (!priv) |
155 | return -ENOMEM; | |
156 | ||
d985c108 | 157 | filp->private_data = priv; |
6c340eac | 158 | priv->filp = filp; |
2df68b43 | 159 | priv->uid = current_euid(); |
5fce5e0b | 160 | priv->pid = get_pid(task_pid(current)); |
f4aede2e | 161 | priv->minor = minor; |
df9b6a9c | 162 | |
d985c108 | 163 | /* for compatibility root is always authenticated */ |
3cb01a98 | 164 | priv->authenticated = capable(CAP_SYS_ADMIN); |
d985c108 DA |
165 | priv->lock_count = 0; |
166 | ||
bd1b331f | 167 | INIT_LIST_HEAD(&priv->lhead); |
f453ba04 | 168 | INIT_LIST_HEAD(&priv->fbs); |
4b096ac1 | 169 | mutex_init(&priv->fbs_lock); |
c9a9c5e0 KH |
170 | INIT_LIST_HEAD(&priv->event_list); |
171 | init_waitqueue_head(&priv->event_wait); | |
172 | priv->event_space = 4096; /* set aside 4k for event buffer */ | |
bd1b331f | 173 | |
673a394b EA |
174 | if (dev->driver->driver_features & DRIVER_GEM) |
175 | drm_gem_open(dev, priv); | |
176 | ||
3248877e DA |
177 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
178 | drm_prime_init_file_private(&priv->prime); | |
179 | ||
d985c108 DA |
180 | if (dev->driver->open) { |
181 | ret = dev->driver->open(dev, priv); | |
182 | if (ret < 0) | |
df9b6a9c | 183 | goto out_prime_destroy; |
d985c108 DA |
184 | } |
185 | ||
1793126f DH |
186 | /* if there is no current master make this fd it, but do not create |
187 | * any master object for render clients */ | |
c996fd0b | 188 | mutex_lock(&dev->master_mutex); |
43683057 | 189 | if (drm_is_primary_client(priv) && !priv->minor->master) { |
7c1c2871 DA |
190 | /* create a new master */ |
191 | priv->minor->master = drm_master_create(priv->minor); | |
192 | if (!priv->minor->master) { | |
193 | ret = -ENOMEM; | |
df9b6a9c | 194 | goto out_close; |
7c1c2871 DA |
195 | } |
196 | ||
7963e9db | 197 | priv->is_master = 1; |
7c1c2871 DA |
198 | /* take another reference for the copy in the local file priv */ |
199 | priv->master = drm_master_get(priv->minor->master); | |
7c1c2871 DA |
200 | priv->authenticated = 1; |
201 | ||
7c1c2871 DA |
202 | if (dev->driver->master_create) { |
203 | ret = dev->driver->master_create(dev, priv->master); | |
204 | if (ret) { | |
7c1c2871 DA |
205 | /* drop both references if this fails */ |
206 | drm_master_put(&priv->minor->master); | |
207 | drm_master_put(&priv->master); | |
df9b6a9c | 208 | goto out_close; |
7c1c2871 DA |
209 | } |
210 | } | |
862302ff TH |
211 | if (dev->driver->master_set) { |
212 | ret = dev->driver->master_set(dev, priv, true); | |
213 | if (ret) { | |
214 | /* drop both references if this fails */ | |
215 | drm_master_put(&priv->minor->master); | |
216 | drm_master_put(&priv->master); | |
df9b6a9c | 217 | goto out_close; |
862302ff TH |
218 | } |
219 | } | |
43683057 | 220 | } else if (drm_is_primary_client(priv)) { |
7c1c2871 DA |
221 | /* get a reference to the master */ |
222 | priv->master = drm_master_get(priv->minor->master); | |
7c1c2871 | 223 | } |
c996fd0b | 224 | mutex_unlock(&dev->master_mutex); |
bd1b331f | 225 | |
7c1c2871 | 226 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 227 | list_add(&priv->lhead, &dev->filelist); |
30e2fb18 | 228 | mutex_unlock(&dev->struct_mutex); |
d985c108 DA |
229 | |
230 | #ifdef __alpha__ | |
231 | /* | |
232 | * Default the hose | |
233 | */ | |
234 | if (!dev->hose) { | |
235 | struct pci_dev *pci_dev; | |
236 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
237 | if (pci_dev) { | |
238 | dev->hose = pci_dev->sysdata; | |
239 | pci_dev_put(pci_dev); | |
240 | } | |
241 | if (!dev->hose) { | |
59c1ad3b YW |
242 | struct pci_bus *b = list_entry(pci_root_buses.next, |
243 | struct pci_bus, node); | |
d985c108 DA |
244 | if (b) |
245 | dev->hose = b->sysdata; | |
246 | } | |
247 | } | |
248 | #endif | |
249 | ||
250 | return 0; | |
df9b6a9c SWK |
251 | |
252 | out_close: | |
c996fd0b | 253 | mutex_unlock(&dev->master_mutex); |
df9b6a9c SWK |
254 | if (dev->driver->postclose) |
255 | dev->driver->postclose(dev, priv); | |
256 | out_prime_destroy: | |
257 | if (drm_core_check_feature(dev, DRIVER_PRIME)) | |
258 | drm_prime_destroy_file_private(&priv->prime); | |
259 | if (dev->driver->driver_features & DRIVER_GEM) | |
260 | drm_gem_release(dev, priv); | |
df9b6a9c | 261 | put_pid(priv->pid); |
9a298b2a | 262 | kfree(priv); |
d985c108 DA |
263 | filp->private_data = NULL; |
264 | return ret; | |
265 | } | |
266 | ||
7c1c2871 DA |
267 | static void drm_master_release(struct drm_device *dev, struct file *filp) |
268 | { | |
269 | struct drm_file *file_priv = filp->private_data; | |
270 | ||
7c1c2871 DA |
271 | if (drm_i_have_hw_lock(dev, file_priv)) { |
272 | DRM_DEBUG("File %p released, freeing lock for context %d\n", | |
273 | filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); | |
274 | drm_lock_free(&file_priv->master->lock, | |
275 | _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); | |
276 | } | |
7c1c2871 DA |
277 | } |
278 | ||
c9a9c5e0 KH |
279 | static void drm_events_release(struct drm_file *file_priv) |
280 | { | |
281 | struct drm_device *dev = file_priv->minor->dev; | |
282 | struct drm_pending_event *e, *et; | |
283 | struct drm_pending_vblank_event *v, *vt; | |
284 | unsigned long flags; | |
285 | ||
286 | spin_lock_irqsave(&dev->event_lock, flags); | |
287 | ||
288 | /* Remove pending flips */ | |
289 | list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link) | |
290 | if (v->base.file_priv == file_priv) { | |
291 | list_del(&v->base.link); | |
292 | drm_vblank_put(dev, v->pipe); | |
293 | v->base.destroy(&v->base); | |
294 | } | |
295 | ||
296 | /* Remove unconsumed events */ | |
1dda6805 YC |
297 | list_for_each_entry_safe(e, et, &file_priv->event_list, link) { |
298 | list_del(&e->link); | |
c9a9c5e0 | 299 | e->destroy(e); |
1dda6805 | 300 | } |
c9a9c5e0 KH |
301 | |
302 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
303 | } | |
304 | ||
1c8887dd DH |
305 | /** |
306 | * drm_legacy_dev_reinit | |
307 | * | |
308 | * Reinitializes a legacy/ums drm device in it's lastclose function. | |
309 | */ | |
310 | static void drm_legacy_dev_reinit(struct drm_device *dev) | |
311 | { | |
1c8887dd DH |
312 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
313 | return; | |
314 | ||
1c8887dd DH |
315 | dev->sigdata.lock = NULL; |
316 | ||
317 | dev->context_flag = 0; | |
318 | dev->last_context = 0; | |
319 | dev->if_version = 0; | |
320 | } | |
321 | ||
322 | /** | |
323 | * Take down the DRM device. | |
324 | * | |
325 | * \param dev DRM device structure. | |
326 | * | |
327 | * Frees every resource in \p dev. | |
328 | * | |
329 | * \sa drm_device | |
330 | */ | |
331 | int drm_lastclose(struct drm_device * dev) | |
332 | { | |
333 | struct drm_vma_entry *vma, *vma_temp; | |
334 | ||
335 | DRM_DEBUG("\n"); | |
336 | ||
337 | if (dev->driver->lastclose) | |
338 | dev->driver->lastclose(dev); | |
339 | DRM_DEBUG("driver lastclose completed\n"); | |
340 | ||
341 | if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) | |
342 | drm_irq_uninstall(dev); | |
343 | ||
344 | mutex_lock(&dev->struct_mutex); | |
345 | ||
346 | drm_agp_clear(dev); | |
347 | ||
348 | drm_legacy_sg_cleanup(dev); | |
349 | ||
350 | /* Clear vma list (only built for debugging) */ | |
351 | list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { | |
352 | list_del(&vma->head); | |
353 | kfree(vma); | |
354 | } | |
355 | ||
356 | drm_legacy_dma_takedown(dev); | |
357 | ||
1c8887dd DH |
358 | mutex_unlock(&dev->struct_mutex); |
359 | ||
360 | drm_legacy_dev_reinit(dev); | |
361 | ||
362 | DRM_DEBUG("lastclose completed\n"); | |
363 | return 0; | |
364 | } | |
365 | ||
1da177e4 LT |
366 | /** |
367 | * Release file. | |
368 | * | |
369 | * \param inode device inode | |
6c340eac | 370 | * \param file_priv DRM file private. |
1da177e4 LT |
371 | * \return zero on success or a negative number on failure. |
372 | * | |
373 | * If the hardware lock is held then free it, and take it again for the kernel | |
374 | * context since it's necessary to reclaim buffers. Unlink the file private | |
375 | * data from its list and free it. Decreases the open count and if it reaches | |
22eae947 | 376 | * zero calls drm_lastclose(). |
1da177e4 | 377 | */ |
b5e89ed5 | 378 | int drm_release(struct inode *inode, struct file *filp) |
1da177e4 | 379 | { |
6c340eac | 380 | struct drm_file *file_priv = filp->private_data; |
1616c525 DH |
381 | struct drm_minor *minor = file_priv->minor; |
382 | struct drm_device *dev = minor->dev; | |
1da177e4 LT |
383 | int retcode = 0; |
384 | ||
58374713 | 385 | mutex_lock(&drm_global_mutex); |
1da177e4 | 386 | |
b5e89ed5 | 387 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
1da177e4 | 388 | |
dff01de1 CW |
389 | mutex_lock(&dev->struct_mutex); |
390 | list_del(&file_priv->lhead); | |
391 | mutex_unlock(&dev->struct_mutex); | |
392 | ||
22eae947 | 393 | if (dev->driver->preclose) |
6c340eac | 394 | dev->driver->preclose(dev, file_priv); |
1da177e4 LT |
395 | |
396 | /* ======================================================== | |
397 | * Begin inline drm_release | |
398 | */ | |
399 | ||
b5e89ed5 | 400 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
ba25f9dc | 401 | task_pid_nr(current), |
5817878c | 402 | (long)old_encode_dev(file_priv->minor->kdev->devt), |
b5e89ed5 DA |
403 | dev->open_count); |
404 | ||
598781d7 TH |
405 | /* Release any auth tokens that might point to this file_priv, |
406 | (do that under the drm_global_mutex) */ | |
407 | if (file_priv->magic) | |
408 | (void) drm_remove_magic(file_priv->master, file_priv->magic); | |
409 | ||
7c1c2871 DA |
410 | /* if the master has gone away we can't do anything with the lock */ |
411 | if (file_priv->minor->master) | |
412 | drm_master_release(dev, filp); | |
1da177e4 | 413 | |
67cb4b4d DV |
414 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) |
415 | drm_core_reclaim_buffers(dev, file_priv); | |
416 | ||
c9a9c5e0 KH |
417 | drm_events_release(file_priv); |
418 | ||
ea39f835 KH |
419 | if (dev->driver->driver_features & DRIVER_MODESET) |
420 | drm_fb_release(file_priv); | |
421 | ||
4e47e02d P |
422 | if (dev->driver->driver_features & DRIVER_GEM) |
423 | drm_gem_release(dev, file_priv); | |
424 | ||
e7b96070 | 425 | drm_legacy_ctxbitmap_flush(dev, file_priv); |
1da177e4 | 426 | |
c996fd0b | 427 | mutex_lock(&dev->master_mutex); |
7c1c2871 | 428 | |
7963e9db | 429 | if (file_priv->is_master) { |
fda714c2 | 430 | struct drm_master *master = file_priv->master; |
bd1b331f | 431 | |
fda714c2 TH |
432 | /** |
433 | * Since the master is disappearing, so is the | |
434 | * possibility to lock. | |
435 | */ | |
3cb01a98 | 436 | mutex_lock(&dev->struct_mutex); |
fda714c2 TH |
437 | if (master->lock.hw_lock) { |
438 | if (dev->sigdata.lock == master->lock.hw_lock) | |
439 | dev->sigdata.lock = NULL; | |
440 | master->lock.hw_lock = NULL; | |
441 | master->lock.file_priv = NULL; | |
442 | wake_up_interruptible_all(&master->lock.lock_queue); | |
443 | } | |
c996fd0b | 444 | mutex_unlock(&dev->struct_mutex); |
fda714c2 | 445 | |
7c1c2871 DA |
446 | if (file_priv->minor->master == file_priv->master) { |
447 | /* drop the reference held my the minor */ | |
862302ff TH |
448 | if (dev->driver->master_drop) |
449 | dev->driver->master_drop(dev, file_priv, true); | |
7c1c2871 DA |
450 | drm_master_put(&file_priv->minor->master); |
451 | } | |
1da177e4 | 452 | } |
7c1c2871 | 453 | |
c996fd0b | 454 | /* drop the master reference held by the file priv */ |
1793126f DH |
455 | if (file_priv->master) |
456 | drm_master_put(&file_priv->master); | |
7963e9db | 457 | file_priv->is_master = 0; |
c996fd0b TH |
458 | mutex_unlock(&dev->master_mutex); |
459 | ||
22eae947 | 460 | if (dev->driver->postclose) |
6c340eac | 461 | dev->driver->postclose(dev, file_priv); |
3248877e | 462 | |
319c933c | 463 | |
3248877e DA |
464 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
465 | drm_prime_destroy_file_private(&file_priv->prime); | |
466 | ||
5fce5e0b | 467 | put_pid(file_priv->pid); |
9a298b2a | 468 | kfree(file_priv); |
1da177e4 LT |
469 | |
470 | /* ======================================================== | |
471 | * End inline drm_release | |
472 | */ | |
473 | ||
b5e89ed5 | 474 | if (!--dev->open_count) { |
43d1337c | 475 | retcode = drm_lastclose(dev); |
2c07a21d DA |
476 | if (drm_device_is_unplugged(dev)) |
477 | drm_put_dev(dev); | |
1da177e4 | 478 | } |
58374713 | 479 | mutex_unlock(&drm_global_mutex); |
1da177e4 | 480 | |
1616c525 DH |
481 | drm_minor_release(minor); |
482 | ||
1da177e4 LT |
483 | return retcode; |
484 | } | |
485 | EXPORT_SYMBOL(drm_release); | |
486 | ||
c9a9c5e0 KH |
487 | static bool |
488 | drm_dequeue_event(struct drm_file *file_priv, | |
489 | size_t total, size_t max, struct drm_pending_event **out) | |
490 | { | |
491 | struct drm_device *dev = file_priv->minor->dev; | |
492 | struct drm_pending_event *e; | |
493 | unsigned long flags; | |
494 | bool ret = false; | |
495 | ||
496 | spin_lock_irqsave(&dev->event_lock, flags); | |
497 | ||
498 | *out = NULL; | |
499 | if (list_empty(&file_priv->event_list)) | |
500 | goto out; | |
501 | e = list_first_entry(&file_priv->event_list, | |
502 | struct drm_pending_event, link); | |
503 | if (e->event->length + total > max) | |
504 | goto out; | |
505 | ||
506 | file_priv->event_space += e->event->length; | |
507 | list_del(&e->link); | |
508 | *out = e; | |
509 | ret = true; | |
510 | ||
511 | out: | |
512 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
513 | return ret; | |
514 | } | |
515 | ||
516 | ssize_t drm_read(struct file *filp, char __user *buffer, | |
517 | size_t count, loff_t *offset) | |
518 | { | |
519 | struct drm_file *file_priv = filp->private_data; | |
520 | struct drm_pending_event *e; | |
521 | size_t total; | |
522 | ssize_t ret; | |
523 | ||
524 | ret = wait_event_interruptible(file_priv->event_wait, | |
525 | !list_empty(&file_priv->event_list)); | |
526 | if (ret < 0) | |
527 | return ret; | |
528 | ||
529 | total = 0; | |
530 | while (drm_dequeue_event(file_priv, total, count, &e)) { | |
531 | if (copy_to_user(buffer + total, | |
532 | e->event, e->event->length)) { | |
533 | total = -EFAULT; | |
534 | break; | |
535 | } | |
536 | ||
537 | total += e->event->length; | |
538 | e->destroy(e); | |
539 | } | |
540 | ||
541 | return total; | |
542 | } | |
543 | EXPORT_SYMBOL(drm_read); | |
544 | ||
1da177e4 LT |
545 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) |
546 | { | |
c9a9c5e0 KH |
547 | struct drm_file *file_priv = filp->private_data; |
548 | unsigned int mask = 0; | |
549 | ||
550 | poll_wait(filp, &file_priv->event_wait, wait); | |
551 | ||
552 | if (!list_empty(&file_priv->event_list)) | |
553 | mask |= POLLIN | POLLRDNORM; | |
554 | ||
555 | return mask; | |
1da177e4 | 556 | } |
b5e89ed5 | 557 | EXPORT_SYMBOL(drm_poll); |