1 /*
2 * \author Rickard E. (Rik) Faith <faith@valinux.com>
3 * \author Daryll Strauss <daryll@valinux.com>
4 * \author Gareth Hughes <gareth@valinux.com>
5 */
6
7 /*
8 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
9 *
10 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
23 * Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
31 * OTHER DEALINGS IN THE SOFTWARE.
32 */
33
34 #include <linux/poll.h>
35 #include <linux/slab.h>
36 #include <linux/module.h>
37
38 #include <drm/drm_client.h>
39 #include <drm/drm_file.h>
40 #include <drm/drmP.h>
41
42 #include "drm_legacy.h"
43 #include "drm_internal.h"
44 #include "drm_crtc_internal.h"
45
46 /* from BKL pushdown */
47 DEFINE_MUTEX(drm_global_mutex);
48
49 /**
50 * DOC: file operations
51 *
52 * Drivers must define the file operations structure that forms the DRM
53 * userspace API entry point, even though most of those operations are
54 * implemented in the DRM core. The resulting &struct file_operations must be
55 * stored in the &drm_driver.fops field. The mandatory functions are drm_open(),
56 * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled
57 * Note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n, so there's no
58 * need to sprinkle #ifdef into the code. Drivers which implement private ioctls
59 * that require 32/64 bit compatibility support must provide their own
60 * &file_operations.compat_ioctl handler that processes private ioctls and calls
61 * drm_compat_ioctl() for core ioctls.
62 *
63 * In addition drm_read() and drm_poll() provide support for DRM events. DRM
64 * events are a generic and extensible means to send asynchronous events to
65 * userspace through the file descriptor. They are used to send vblank event and
66 * page flip completions by the KMS API. But drivers can also use it for their
67 * own needs, e.g. to signal completion of rendering.
68 *
69 * For the driver-side event interface see drm_event_reserve_init() and
70 * drm_send_event() as the main starting points.
71 *
72 * The memory mapping implementation will vary depending on how the driver
73 * manages memory. Legacy drivers will use the deprecated drm_legacy_mmap()
74 * function, modern drivers should use one of the provided memory-manager
75 * specific implementations. For GEM-based drivers this is drm_gem_mmap(), and
76 * for drivers which use the CMA GEM helpers it's drm_gem_cma_mmap().
77 *
78 * No other file operations are supported by the DRM userspace API. Overall the
79 * following is an example &file_operations structure::
80 *
81 * static const example_drm_fops = {
82 * .owner = THIS_MODULE,
83 * .open = drm_open,
84 * .release = drm_release,
85 * .unlocked_ioctl = drm_ioctl,
86 * .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n
87 * .poll = drm_poll,
88 * .read = drm_read,
89 * .llseek = no_llseek,
90 * .mmap = drm_gem_mmap,
91 * };
92 *
93 * For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for
94 * CMA based drivers there is the DEFINE_DRM_GEM_CMA_FOPS() macro to make this
95 * simpler.
96 *
97 * The driver's &file_operations must be stored in &drm_driver.fops.
98 *
99 * For driver-private IOCTL handling see the more detailed discussion in
100 * :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`.
101 */
102
103 static int drm_open_helper(struct file *filp, struct drm_minor *minor);
104
105 /**
106 * drm_file_alloc - allocate file context
107 * @minor: minor to allocate on
108 *
109 * This allocates a new DRM file context. It is not linked into any context and
110 * can be used by the caller freely. Note that the context keeps a pointer to
111 * @minor, so it must be freed before @minor is.
112 *
113 * RETURNS:
114 * Pointer to newly allocated context, ERR_PTR on failure.
115 */
drm_file_alloc(struct drm_minor * minor)116 struct drm_file *drm_file_alloc(struct drm_minor *minor)
117 {
118 struct drm_device *dev = minor->dev;
119 struct drm_file *file;
120 int ret;
121
122 file = kzalloc(sizeof(*file), GFP_KERNEL);
123 if (!file)
124 return ERR_PTR(-ENOMEM);
125
126 file->pid = get_pid(task_pid(current));
127 file->minor = minor;
128
129 /* for compatibility root is always authenticated */
130 file->authenticated = capable(CAP_SYS_ADMIN);
131 file->lock_count = 0;
132
133 INIT_LIST_HEAD(&file->lhead);
134 INIT_LIST_HEAD(&file->fbs);
135 mutex_init(&file->fbs_lock);
136 INIT_LIST_HEAD(&file->blobs);
137 INIT_LIST_HEAD(&file->pending_event_list);
138 INIT_LIST_HEAD(&file->event_list);
139 init_waitqueue_head(&file->event_wait);
140 file->event_space = 4096; /* set aside 4k for event buffer */
141
142 mutex_init(&file->event_read_lock);
143
144 if (drm_core_check_feature(dev, DRIVER_GEM))
145 drm_gem_open(dev, file);
146
147 if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
148 drm_syncobj_open(file);
149
150 if (drm_core_check_feature(dev, DRIVER_PRIME))
151 drm_prime_init_file_private(&file->prime);
152
153 if (dev->driver->open) {
154 ret = dev->driver->open(dev, file);
155 if (ret < 0)
156 goto out_prime_destroy;
157 }
158
159 return file;
160
161 out_prime_destroy:
162 if (drm_core_check_feature(dev, DRIVER_PRIME))
163 drm_prime_destroy_file_private(&file->prime);
164 if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
165 drm_syncobj_release(file);
166 if (drm_core_check_feature(dev, DRIVER_GEM))
167 drm_gem_release(dev, file);
168 put_pid(file->pid);
169 kfree(file);
170
171 return ERR_PTR(ret);
172 }
173
drm_events_release(struct drm_file * file_priv)174 static void drm_events_release(struct drm_file *file_priv)
175 {
176 struct drm_device *dev = file_priv->minor->dev;
177 struct drm_pending_event *e, *et;
178 unsigned long flags;
179
180 spin_lock_irqsave(&dev->event_lock, flags);
181
182 /* Unlink pending events */
183 list_for_each_entry_safe(e, et, &file_priv->pending_event_list,
184 pending_link) {
185 list_del(&e->pending_link);
186 e->file_priv = NULL;
187 }
188
189 /* Remove unconsumed events */
190 list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
191 list_del(&e->link);
192 kfree(e);
193 }
194
195 spin_unlock_irqrestore(&dev->event_lock, flags);
196 }
197
198 /**
199 * drm_file_free - free file context
200 * @file: context to free, or NULL
201 *
202 * This destroys and deallocates a DRM file context previously allocated via
203 * drm_file_alloc(). The caller must make sure to unlink it from any contexts
204 * before calling this.
205 *
206 * If NULL is passed, this is a no-op.
207 *
208 * RETURNS:
209 * 0 on success, or error code on failure.
210 */
drm_file_free(struct drm_file * file)211 void drm_file_free(struct drm_file *file)
212 {
213 struct drm_device *dev;
214
215 if (!file)
216 return;
217
218 dev = file->minor->dev;
219
220 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
221 task_pid_nr(current),
222 (long)old_encode_dev(file->minor->kdev->devt),
223 dev->open_count);
224
225 if (drm_core_check_feature(dev, DRIVER_LEGACY) &&
226 dev->driver->preclose)
227 dev->driver->preclose(dev, file);
228
229 if (drm_core_check_feature(dev, DRIVER_LEGACY))
230 drm_legacy_lock_release(dev, file->filp);
231
232 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
233 drm_legacy_reclaim_buffers(dev, file);
234
235 drm_events_release(file);
236
237 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
238 drm_fb_release(file);
239 drm_property_destroy_user_blobs(dev, file);
240 }
241
242 if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
243 drm_syncobj_release(file);
244
245 if (drm_core_check_feature(dev, DRIVER_GEM))
246 drm_gem_release(dev, file);
247
248 drm_legacy_ctxbitmap_flush(dev, file);
249
250 if (drm_is_primary_client(file))
251 drm_master_release(file);
252
253 if (dev->driver->postclose)
254 dev->driver->postclose(dev, file);
255
256 if (drm_core_check_feature(dev, DRIVER_PRIME))
257 drm_prime_destroy_file_private(&file->prime);
258
259 WARN_ON(!list_empty(&file->event_list));
260
261 put_pid(file->pid);
262 kfree(file);
263 }
264
drm_setup(struct drm_device * dev)265 static int drm_setup(struct drm_device * dev)
266 {
267 int ret;
268
269 if (dev->driver->firstopen &&
270 drm_core_check_feature(dev, DRIVER_LEGACY)) {
271 ret = dev->driver->firstopen(dev);
272 if (ret != 0)
273 return ret;
274 }
275
276 ret = drm_legacy_dma_setup(dev);
277 if (ret < 0)
278 return ret;
279
280
281 DRM_DEBUG("\n");
282 return 0;
283 }
284
285 /**
286 * drm_open - open method for DRM file
287 * @inode: device inode
288 * @filp: file pointer.
289 *
290 * This function must be used by drivers as their &file_operations.open method.
291 * It looks up the correct DRM device and instantiates all the per-file
292 * resources for it. It also calls the &drm_driver.open driver callback.
293 *
294 * RETURNS:
295 *
296 * 0 on success or negative errno value on falure.
297 */
drm_open(struct inode * inode,struct file * filp)298 int drm_open(struct inode *inode, struct file *filp)
299 {
300 struct drm_device *dev;
301 struct drm_minor *minor;
302 int retcode;
303 int need_setup = 0;
304
305 minor = drm_minor_acquire(iminor(inode));
306 if (IS_ERR(minor))
307 return PTR_ERR(minor);
308
309 dev = minor->dev;
310 if (!dev->open_count++)
311 need_setup = 1;
312
313 /* share address_space across all char-devs of a single device */
314 filp->f_mapping = dev->anon_inode->i_mapping;
315
316 retcode = drm_open_helper(filp, minor);
317 if (retcode)
318 goto err_undo;
319 if (need_setup) {
320 retcode = drm_setup(dev);
321 if (retcode)
322 goto err_undo;
323 }
324 return 0;
325
326 err_undo:
327 dev->open_count--;
328 drm_minor_release(minor);
329 return retcode;
330 }
331 EXPORT_SYMBOL(drm_open);
332
333 /*
334 * Check whether DRI will run on this CPU.
335 *
336 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
337 */
drm_cpu_valid(void)338 static int drm_cpu_valid(void)
339 {
340 #if defined(__sparc__) && !defined(__sparc_v9__)
341 return 0; /* No cmpxchg before v9 sparc. */
342 #endif
343 return 1;
344 }
345
346 /*
347 * Called whenever a process opens /dev/drm.
348 *
349 * \param filp file pointer.
350 * \param minor acquired minor-object.
351 * \return zero on success or a negative number on failure.
352 *
353 * Creates and initializes a drm_file structure for the file private data in \p
354 * filp and add it into the double linked list in \p dev.
355 */
drm_open_helper(struct file * filp,struct drm_minor * minor)356 static int drm_open_helper(struct file *filp, struct drm_minor *minor)
357 {
358 struct drm_device *dev = minor->dev;
359 struct drm_file *priv;
360 int ret;
361
362 if (filp->f_flags & O_EXCL)
363 return -EBUSY; /* No exclusive opens */
364 if (!drm_cpu_valid())
365 return -EINVAL;
366 if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
367 return -EINVAL;
368
369 DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index);
370
371 priv = drm_file_alloc(minor);
372 if (IS_ERR(priv))
373 return PTR_ERR(priv);
374
375 if (drm_is_primary_client(priv)) {
376 ret = drm_master_open(priv);
377 if (ret) {
378 drm_file_free(priv);
379 return ret;
380 }
381 }
382
383 filp->private_data = priv;
384 filp->f_mode |= FMODE_UNSIGNED_OFFSET;
385 priv->filp = filp;
386
387 mutex_lock(&dev->filelist_mutex);
388 list_add(&priv->lhead, &dev->filelist);
389 mutex_unlock(&dev->filelist_mutex);
390
391 #ifdef __alpha__
392 /*
393 * Default the hose
394 */
395 if (!dev->hose) {
396 struct pci_dev *pci_dev;
397 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
398 if (pci_dev) {
399 dev->hose = pci_dev->sysdata;
400 pci_dev_put(pci_dev);
401 }
402 if (!dev->hose) {
403 struct pci_bus *b = list_entry(pci_root_buses.next,
404 struct pci_bus, node);
405 if (b)
406 dev->hose = b->sysdata;
407 }
408 }
409 #endif
410
411 return 0;
412 }
413
drm_legacy_dev_reinit(struct drm_device * dev)414 static void drm_legacy_dev_reinit(struct drm_device *dev)
415 {
416 if (dev->irq_enabled)
417 drm_irq_uninstall(dev);
418
419 mutex_lock(&dev->struct_mutex);
420
421 drm_legacy_agp_clear(dev);
422
423 drm_legacy_sg_cleanup(dev);
424 drm_legacy_vma_flush(dev);
425 drm_legacy_dma_takedown(dev);
426
427 mutex_unlock(&dev->struct_mutex);
428
429 dev->sigdata.lock = NULL;
430
431 dev->context_flag = 0;
432 dev->last_context = 0;
433 dev->if_version = 0;
434
435 DRM_DEBUG("lastclose completed\n");
436 }
437
drm_lastclose(struct drm_device * dev)438 void drm_lastclose(struct drm_device * dev)
439 {
440 DRM_DEBUG("\n");
441
442 if (dev->driver->lastclose)
443 dev->driver->lastclose(dev);
444 DRM_DEBUG("driver lastclose completed\n");
445
446 if (drm_core_check_feature(dev, DRIVER_LEGACY))
447 drm_legacy_dev_reinit(dev);
448
449 drm_client_dev_restore(dev);
450 }
451
452 /**
453 * drm_release - release method for DRM file
454 * @inode: device inode
455 * @filp: file pointer.
456 *
457 * This function must be used by drivers as their &file_operations.release
458 * method. It frees any resources associated with the open file, and calls the
459 * &drm_driver.postclose driver callback. If this is the last open file for the
460 * DRM device also proceeds to call the &drm_driver.lastclose driver callback.
461 *
462 * RETURNS:
463 *
464 * Always succeeds and returns 0.
465 */
drm_release(struct inode * inode,struct file * filp)466 int drm_release(struct inode *inode, struct file *filp)
467 {
468 struct drm_file *file_priv = filp->private_data;
469 struct drm_minor *minor = file_priv->minor;
470 struct drm_device *dev = minor->dev;
471
472 mutex_lock(&drm_global_mutex);
473
474 DRM_DEBUG("open_count = %d\n", dev->open_count);
475
476 mutex_lock(&dev->filelist_mutex);
477 list_del(&file_priv->lhead);
478 mutex_unlock(&dev->filelist_mutex);
479
480 drm_file_free(file_priv);
481
482 if (!--dev->open_count)
483 drm_lastclose(dev);
484
485 mutex_unlock(&drm_global_mutex);
486
487 drm_minor_release(minor);
488
489 return 0;
490 }
491 EXPORT_SYMBOL(drm_release);
492
493 /**
494 * drm_read - read method for DRM file
495 * @filp: file pointer
496 * @buffer: userspace destination pointer for the read
497 * @count: count in bytes to read
498 * @offset: offset to read
499 *
500 * This function must be used by drivers as their &file_operations.read
501 * method iff they use DRM events for asynchronous signalling to userspace.
502 * Since events are used by the KMS API for vblank and page flip completion this
503 * means all modern display drivers must use it.
504 *
505 * @offset is ignored, DRM events are read like a pipe. Therefore drivers also
506 * must set the &file_operation.llseek to no_llseek(). Polling support is
507 * provided by drm_poll().
508 *
509 * This function will only ever read a full event. Therefore userspace must
510 * supply a big enough buffer to fit any event to ensure forward progress. Since
511 * the maximum event space is currently 4K it's recommended to just use that for
512 * safety.
513 *
514 * RETURNS:
515 *
516 * Number of bytes read (always aligned to full events, and can be 0) or a
517 * negative error code on failure.
518 */
drm_read(struct file * filp,char __user * buffer,size_t count,loff_t * offset)519 ssize_t drm_read(struct file *filp, char __user *buffer,
520 size_t count, loff_t *offset)
521 {
522 struct drm_file *file_priv = filp->private_data;
523 struct drm_device *dev = file_priv->minor->dev;
524 ssize_t ret;
525
526 if (!access_ok(VERIFY_WRITE, buffer, count))
527 return -EFAULT;
528
529 ret = mutex_lock_interruptible(&file_priv->event_read_lock);
530 if (ret)
531 return ret;
532
533 for (;;) {
534 struct drm_pending_event *e = NULL;
535
536 spin_lock_irq(&dev->event_lock);
537 if (!list_empty(&file_priv->event_list)) {
538 e = list_first_entry(&file_priv->event_list,
539 struct drm_pending_event, link);
540 file_priv->event_space += e->event->length;
541 list_del(&e->link);
542 }
543 spin_unlock_irq(&dev->event_lock);
544
545 if (e == NULL) {
546 if (ret)
547 break;
548
549 if (filp->f_flags & O_NONBLOCK) {
550 ret = -EAGAIN;
551 break;
552 }
553
554 mutex_unlock(&file_priv->event_read_lock);
555 ret = wait_event_interruptible(file_priv->event_wait,
556 !list_empty(&file_priv->event_list));
557 if (ret >= 0)
558 ret = mutex_lock_interruptible(&file_priv->event_read_lock);
559 if (ret)
560 return ret;
561 } else {
562 unsigned length = e->event->length;
563
564 if (length > count - ret) {
565 put_back_event:
566 spin_lock_irq(&dev->event_lock);
567 file_priv->event_space -= length;
568 list_add(&e->link, &file_priv->event_list);
569 spin_unlock_irq(&dev->event_lock);
570 wake_up_interruptible(&file_priv->event_wait);
571 break;
572 }
573
574 if (copy_to_user(buffer + ret, e->event, length)) {
575 if (ret == 0)
576 ret = -EFAULT;
577 goto put_back_event;
578 }
579
580 ret += length;
581 kfree(e);
582 }
583 }
584 mutex_unlock(&file_priv->event_read_lock);
585
586 return ret;
587 }
588 EXPORT_SYMBOL(drm_read);
589
590 /**
591 * drm_poll - poll method for DRM file
592 * @filp: file pointer
593 * @wait: poll waiter table
594 *
595 * This function must be used by drivers as their &file_operations.read method
596 * iff they use DRM events for asynchronous signalling to userspace. Since
597 * events are used by the KMS API for vblank and page flip completion this means
598 * all modern display drivers must use it.
599 *
600 * See also drm_read().
601 *
602 * RETURNS:
603 *
604 * Mask of POLL flags indicating the current status of the file.
605 */
drm_poll(struct file * filp,struct poll_table_struct * wait)606 __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait)
607 {
608 struct drm_file *file_priv = filp->private_data;
609 __poll_t mask = 0;
610
611 poll_wait(filp, &file_priv->event_wait, wait);
612
613 if (!list_empty(&file_priv->event_list))
614 mask |= EPOLLIN | EPOLLRDNORM;
615
616 return mask;
617 }
618 EXPORT_SYMBOL(drm_poll);
619
620 /**
621 * drm_event_reserve_init_locked - init a DRM event and reserve space for it
622 * @dev: DRM device
623 * @file_priv: DRM file private data
624 * @p: tracking structure for the pending event
625 * @e: actual event data to deliver to userspace
626 *
627 * This function prepares the passed in event for eventual delivery. If the event
628 * doesn't get delivered (because the IOCTL fails later on, before queuing up
629 * anything) then the even must be cancelled and freed using
630 * drm_event_cancel_free(). Successfully initialized events should be sent out
631 * using drm_send_event() or drm_send_event_locked() to signal completion of the
632 * asynchronous event to userspace.
633 *
634 * If callers embedded @p into a larger structure it must be allocated with
635 * kmalloc and @p must be the first member element.
636 *
637 * This is the locked version of drm_event_reserve_init() for callers which
638 * already hold &drm_device.event_lock.
639 *
640 * RETURNS:
641 *
642 * 0 on success or a negative error code on failure.
643 */
drm_event_reserve_init_locked(struct drm_device * dev,struct drm_file * file_priv,struct drm_pending_event * p,struct drm_event * e)644 int drm_event_reserve_init_locked(struct drm_device *dev,
645 struct drm_file *file_priv,
646 struct drm_pending_event *p,
647 struct drm_event *e)
648 {
649 if (file_priv->event_space < e->length)
650 return -ENOMEM;
651
652 file_priv->event_space -= e->length;
653
654 p->event = e;
655 list_add(&p->pending_link, &file_priv->pending_event_list);
656 p->file_priv = file_priv;
657
658 return 0;
659 }
660 EXPORT_SYMBOL(drm_event_reserve_init_locked);
661
662 /**
663 * drm_event_reserve_init - init a DRM event and reserve space for it
664 * @dev: DRM device
665 * @file_priv: DRM file private data
666 * @p: tracking structure for the pending event
667 * @e: actual event data to deliver to userspace
668 *
669 * This function prepares the passed in event for eventual delivery. If the event
670 * doesn't get delivered (because the IOCTL fails later on, before queuing up
671 * anything) then the even must be cancelled and freed using
672 * drm_event_cancel_free(). Successfully initialized events should be sent out
673 * using drm_send_event() or drm_send_event_locked() to signal completion of the
674 * asynchronous event to userspace.
675 *
676 * If callers embedded @p into a larger structure it must be allocated with
677 * kmalloc and @p must be the first member element.
678 *
679 * Callers which already hold &drm_device.event_lock should use
680 * drm_event_reserve_init_locked() instead.
681 *
682 * RETURNS:
683 *
684 * 0 on success or a negative error code on failure.
685 */
drm_event_reserve_init(struct drm_device * dev,struct drm_file * file_priv,struct drm_pending_event * p,struct drm_event * e)686 int drm_event_reserve_init(struct drm_device *dev,
687 struct drm_file *file_priv,
688 struct drm_pending_event *p,
689 struct drm_event *e)
690 {
691 unsigned long flags;
692 int ret;
693
694 spin_lock_irqsave(&dev->event_lock, flags);
695 ret = drm_event_reserve_init_locked(dev, file_priv, p, e);
696 spin_unlock_irqrestore(&dev->event_lock, flags);
697
698 return ret;
699 }
700 EXPORT_SYMBOL(drm_event_reserve_init);
701
702 /**
703 * drm_event_cancel_free - free a DRM event and release it's space
704 * @dev: DRM device
705 * @p: tracking structure for the pending event
706 *
707 * This function frees the event @p initialized with drm_event_reserve_init()
708 * and releases any allocated space. It is used to cancel an event when the
709 * nonblocking operation could not be submitted and needed to be aborted.
710 */
drm_event_cancel_free(struct drm_device * dev,struct drm_pending_event * p)711 void drm_event_cancel_free(struct drm_device *dev,
712 struct drm_pending_event *p)
713 {
714 unsigned long flags;
715 spin_lock_irqsave(&dev->event_lock, flags);
716 if (p->file_priv) {
717 p->file_priv->event_space += p->event->length;
718 list_del(&p->pending_link);
719 }
720 spin_unlock_irqrestore(&dev->event_lock, flags);
721
722 if (p->fence)
723 dma_fence_put(p->fence);
724
725 kfree(p);
726 }
727 EXPORT_SYMBOL(drm_event_cancel_free);
728
729 /**
730 * drm_send_event_locked - send DRM event to file descriptor
731 * @dev: DRM device
732 * @e: DRM event to deliver
733 *
734 * This function sends the event @e, initialized with drm_event_reserve_init(),
735 * to its associated userspace DRM file. Callers must already hold
736 * &drm_device.event_lock, see drm_send_event() for the unlocked version.
737 *
738 * Note that the core will take care of unlinking and disarming events when the
739 * corresponding DRM file is closed. Drivers need not worry about whether the
740 * DRM file for this event still exists and can call this function upon
741 * completion of the asynchronous work unconditionally.
742 */
drm_send_event_locked(struct drm_device * dev,struct drm_pending_event * e)743 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e)
744 {
745 assert_spin_locked(&dev->event_lock);
746
747 if (e->completion) {
748 complete_all(e->completion);
749 e->completion_release(e->completion);
750 e->completion = NULL;
751 }
752
753 if (e->fence) {
754 dma_fence_signal(e->fence);
755 dma_fence_put(e->fence);
756 }
757
758 if (!e->file_priv) {
759 kfree(e);
760 return;
761 }
762
763 list_del(&e->pending_link);
764 list_add_tail(&e->link,
765 &e->file_priv->event_list);
766 wake_up_interruptible(&e->file_priv->event_wait);
767 }
768 EXPORT_SYMBOL(drm_send_event_locked);
769
770 /**
771 * drm_send_event - send DRM event to file descriptor
772 * @dev: DRM device
773 * @e: DRM event to deliver
774 *
775 * This function sends the event @e, initialized with drm_event_reserve_init(),
776 * to its associated userspace DRM file. This function acquires
777 * &drm_device.event_lock, see drm_send_event_locked() for callers which already
778 * hold this lock.
779 *
780 * Note that the core will take care of unlinking and disarming events when the
781 * corresponding DRM file is closed. Drivers need not worry about whether the
782 * DRM file for this event still exists and can call this function upon
783 * completion of the asynchronous work unconditionally.
784 */
drm_send_event(struct drm_device * dev,struct drm_pending_event * e)785 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e)
786 {
787 unsigned long irqflags;
788
789 spin_lock_irqsave(&dev->event_lock, irqflags);
790 drm_send_event_locked(dev, e);
791 spin_unlock_irqrestore(&dev->event_lock, irqflags);
792 }
793 EXPORT_SYMBOL(drm_send_event);
794