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/anon_inodes.h>
35#include <linux/dma-fence.h>
36#include <linux/export.h>
37#include <linux/file.h>
38#include <linux/module.h>
39#include <linux/pci.h>
40#include <linux/poll.h>
41#include <linux/slab.h>
42#include <linux/vga_switcheroo.h>
43
44#include <drm/drm_client_event.h>
45#include <drm/drm_drv.h>
46#include <drm/drm_file.h>
47#include <drm/drm_gem.h>
48#include <drm/drm_print.h>
49#include <drm/drm_debugfs.h>
50
51#include "drm_crtc_internal.h"
52#include "drm_internal.h"
53
54/* from BKL pushdown */
55DEFINE_MUTEX(drm_global_mutex);
56
57bool drm_dev_needs_global_mutex(struct drm_device *dev)
58{
59 /*
60 * The deprecated ->load callback must be called after the driver is
61 * already registered. This means such drivers rely on the BKL to make
62 * sure an open can't proceed until the driver is actually fully set up.
63 * Similar hilarity holds for the unload callback.
64 */
65 if (dev->driver->load || dev->driver->unload)
66 return true;
67
68 return false;
69}
70
71/**
72 * DOC: file operations
73 *
74 * Drivers must define the file operations structure that forms the DRM
75 * userspace API entry point, even though most of those operations are
76 * implemented in the DRM core. The resulting &struct file_operations must be
77 * stored in the &drm_driver.fops field. The mandatory functions are drm_open(),
78 * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled
79 * Note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n, so there's no
80 * need to sprinkle #ifdef into the code. Drivers which implement private ioctls
81 * that require 32/64 bit compatibility support must provide their own
82 * &file_operations.compat_ioctl handler that processes private ioctls and calls
83 * drm_compat_ioctl() for core ioctls.
84 *
85 * In addition drm_read() and drm_poll() provide support for DRM events. DRM
86 * events are a generic and extensible means to send asynchronous events to
87 * userspace through the file descriptor. They are used to send vblank event and
88 * page flip completions by the KMS API. But drivers can also use it for their
89 * own needs, e.g. to signal completion of rendering.
90 *
91 * For the driver-side event interface see drm_event_reserve_init() and
92 * drm_send_event() as the main starting points.
93 *
94 * The memory mapping implementation will vary depending on how the driver
95 * manages memory. For GEM-based drivers this is drm_gem_mmap().
96 *
97 * No other file operations are supported by the DRM userspace API. Overall the
98 * following is an example &file_operations structure::
99 *
100 * static const example_drm_fops = {
101 * .owner = THIS_MODULE,
102 * .open = drm_open,
103 * .release = drm_release,
104 * .unlocked_ioctl = drm_ioctl,
105 * .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n
106 * .poll = drm_poll,
107 * .read = drm_read,
108 * .mmap = drm_gem_mmap,
109 * };
110 *
111 * For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for
112 * DMA based drivers there is the DEFINE_DRM_GEM_DMA_FOPS() macro to make this
113 * simpler.
114 *
115 * The driver's &file_operations must be stored in &drm_driver.fops.
116 *
117 * For driver-private IOCTL handling see the more detailed discussion in
118 * :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`.
119 */
120
121/**
122 * drm_file_alloc - allocate file context
123 * @minor: minor to allocate on
124 *
125 * This allocates a new DRM file context. It is not linked into any context and
126 * can be used by the caller freely. Note that the context keeps a pointer to
127 * @minor, so it must be freed before @minor is.
128 *
129 * RETURNS:
130 * Pointer to newly allocated context, ERR_PTR on failure.
131 */
132struct drm_file *drm_file_alloc(struct drm_minor *minor)
133{
134 static atomic64_t ident = ATOMIC64_INIT(0);
135 struct drm_device *dev = minor->dev;
136 struct drm_file *file;
137 int ret;
138
139 file = kzalloc(sizeof(*file), GFP_KERNEL);
140 if (!file)
141 return ERR_PTR(error: -ENOMEM);
142
143 /* Get a unique identifier for fdinfo: */
144 file->client_id = atomic64_inc_return(v: &ident);
145 rcu_assign_pointer(file->pid, get_pid(task_tgid(current)));
146 file->minor = minor;
147
148 /* for compatibility root is always authenticated */
149 file->authenticated = capable(CAP_SYS_ADMIN);
150
151 INIT_LIST_HEAD(list: &file->lhead);
152 INIT_LIST_HEAD(list: &file->fbs);
153 mutex_init(&file->fbs_lock);
154 INIT_LIST_HEAD(list: &file->blobs);
155 INIT_LIST_HEAD(list: &file->pending_event_list);
156 INIT_LIST_HEAD(list: &file->event_list);
157 init_waitqueue_head(&file->event_wait);
158 file->event_space = 4096; /* set aside 4k for event buffer */
159
160 spin_lock_init(&file->master_lookup_lock);
161 mutex_init(&file->event_read_lock);
162 mutex_init(&file->client_name_lock);
163
164 if (drm_core_check_feature(dev, feature: DRIVER_GEM))
165 drm_gem_open(dev, file_private: file);
166
167 if (drm_core_check_feature(dev, feature: DRIVER_SYNCOBJ))
168 drm_syncobj_open(file_private: file);
169
170 drm_prime_init_file_private(prime_fpriv: &file->prime);
171
172 if (!drm_core_check_feature(dev, feature: DRIVER_COMPUTE_ACCEL))
173 drm_debugfs_clients_add(file);
174
175 if (dev->driver->open) {
176 ret = dev->driver->open(dev, file);
177 if (ret < 0)
178 goto out_prime_destroy;
179 }
180
181 return file;
182
183out_prime_destroy:
184 drm_prime_destroy_file_private(prime_fpriv: &file->prime);
185 if (drm_core_check_feature(dev, feature: DRIVER_SYNCOBJ))
186 drm_syncobj_release(file_private: file);
187 if (drm_core_check_feature(dev, feature: DRIVER_GEM))
188 drm_gem_release(dev, file_private: file);
189
190 if (!drm_core_check_feature(dev, feature: DRIVER_COMPUTE_ACCEL))
191 drm_debugfs_clients_remove(file);
192
193 put_pid(rcu_access_pointer(file->pid));
194 kfree(objp: file);
195
196 return ERR_PTR(error: ret);
197}
198
199static void drm_events_release(struct drm_file *file_priv)
200{
201 struct drm_device *dev = file_priv->minor->dev;
202 struct drm_pending_event *e, *et;
203 unsigned long flags;
204
205 spin_lock_irqsave(&dev->event_lock, flags);
206
207 /* Unlink pending events */
208 list_for_each_entry_safe(e, et, &file_priv->pending_event_list,
209 pending_link) {
210 list_del(entry: &e->pending_link);
211 e->file_priv = NULL;
212 }
213
214 /* Remove unconsumed events */
215 list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
216 list_del(entry: &e->link);
217 kfree(objp: e);
218 }
219
220 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
221}
222
223/**
224 * drm_file_free - free file context
225 * @file: context to free, or NULL
226 *
227 * This destroys and deallocates a DRM file context previously allocated via
228 * drm_file_alloc(). The caller must make sure to unlink it from any contexts
229 * before calling this.
230 *
231 * If NULL is passed, this is a no-op.
232 */
233void drm_file_free(struct drm_file *file)
234{
235 struct drm_device *dev;
236
237 if (!file)
238 return;
239
240 dev = file->minor->dev;
241
242 drm_dbg_core(dev, "comm=\"%s\", pid=%d, dev=0x%lx, open_count=%d\n",
243 current->comm, task_pid_nr(current),
244 (long)old_encode_dev(file->minor->kdev->devt),
245 atomic_read(&dev->open_count));
246
247 if (!drm_core_check_feature(dev, feature: DRIVER_COMPUTE_ACCEL))
248 drm_debugfs_clients_remove(file);
249
250 drm_events_release(file_priv: file);
251
252 if (drm_core_check_feature(dev, feature: DRIVER_MODESET)) {
253 drm_fb_release(file_priv: file);
254 drm_property_destroy_user_blobs(dev, file_priv: file);
255 }
256
257 if (drm_core_check_feature(dev, feature: DRIVER_SYNCOBJ))
258 drm_syncobj_release(file_private: file);
259
260 if (drm_core_check_feature(dev, feature: DRIVER_GEM))
261 drm_gem_release(dev, file_private: file);
262
263 if (drm_is_primary_client(file_priv: file))
264 drm_master_release(file_priv: file);
265
266 if (dev->driver->postclose)
267 dev->driver->postclose(dev, file);
268
269 drm_prime_destroy_file_private(prime_fpriv: &file->prime);
270
271 WARN_ON(!list_empty(&file->event_list));
272
273 put_pid(rcu_access_pointer(file->pid));
274
275 mutex_destroy(lock: &file->client_name_lock);
276 kfree(objp: file->client_name);
277
278 kfree(objp: file);
279}
280
281static void drm_close_helper(struct file *filp)
282{
283 struct drm_file *file_priv = filp->private_data;
284 struct drm_device *dev = file_priv->minor->dev;
285
286 mutex_lock(&dev->filelist_mutex);
287 list_del(entry: &file_priv->lhead);
288 mutex_unlock(lock: &dev->filelist_mutex);
289
290 drm_file_free(file: file_priv);
291}
292
293/*
294 * Check whether DRI will run on this CPU.
295 *
296 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
297 */
298static int drm_cpu_valid(void)
299{
300#if defined(__sparc__) && !defined(__sparc_v9__)
301 return 0; /* No cmpxchg before v9 sparc. */
302#endif
303 return 1;
304}
305
306/*
307 * Called whenever a process opens a drm node
308 *
309 * \param filp file pointer.
310 * \param minor acquired minor-object.
311 * \return zero on success or a negative number on failure.
312 *
313 * Creates and initializes a drm_file structure for the file private data in \p
314 * filp and add it into the double linked list in \p dev.
315 */
316int drm_open_helper(struct file *filp, struct drm_minor *minor)
317{
318 struct drm_device *dev = minor->dev;
319 struct drm_file *priv;
320 int ret;
321
322 if (filp->f_flags & O_EXCL)
323 return -EBUSY; /* No exclusive opens */
324 if (!drm_cpu_valid())
325 return -EINVAL;
326 if (dev->switch_power_state != DRM_SWITCH_POWER_ON &&
327 dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
328 return -EINVAL;
329 if (WARN_ON_ONCE(!(filp->f_op->fop_flags & FOP_UNSIGNED_OFFSET)))
330 return -EINVAL;
331
332 drm_dbg_core(dev, "comm=\"%s\", pid=%d, minor=%d\n",
333 current->comm, task_pid_nr(current), minor->index);
334
335 priv = drm_file_alloc(minor);
336 if (IS_ERR(ptr: priv))
337 return PTR_ERR(ptr: priv);
338
339 if (drm_is_primary_client(file_priv: priv)) {
340 ret = drm_master_open(file_priv: priv);
341 if (ret) {
342 drm_file_free(file: priv);
343 return ret;
344 }
345 }
346
347 filp->private_data = priv;
348 priv->filp = filp;
349
350 mutex_lock(&dev->filelist_mutex);
351 list_add(new: &priv->lhead, head: &dev->filelist);
352 mutex_unlock(lock: &dev->filelist_mutex);
353
354 return 0;
355}
356
357/**
358 * drm_open - open method for DRM file
359 * @inode: device inode
360 * @filp: file pointer.
361 *
362 * This function must be used by drivers as their &file_operations.open method.
363 * It looks up the correct DRM device and instantiates all the per-file
364 * resources for it. It also calls the &drm_driver.open driver callback.
365 *
366 * RETURNS:
367 * 0 on success or negative errno value on failure.
368 */
369int drm_open(struct inode *inode, struct file *filp)
370{
371 struct drm_device *dev;
372 struct drm_minor *minor;
373 int retcode;
374
375 minor = drm_minor_acquire(minors_xa: &drm_minors_xa, minor_id: iminor(inode));
376 if (IS_ERR(ptr: minor))
377 return PTR_ERR(ptr: minor);
378
379 dev = minor->dev;
380 if (drm_dev_needs_global_mutex(dev))
381 mutex_lock(&drm_global_mutex);
382
383 atomic_fetch_inc(v: &dev->open_count);
384
385 /* share address_space across all char-devs of a single device */
386 filp->f_mapping = dev->anon_inode->i_mapping;
387
388 retcode = drm_open_helper(filp, minor);
389 if (retcode)
390 goto err_undo;
391
392 if (drm_dev_needs_global_mutex(dev))
393 mutex_unlock(lock: &drm_global_mutex);
394
395 return 0;
396
397err_undo:
398 atomic_dec(v: &dev->open_count);
399 if (drm_dev_needs_global_mutex(dev))
400 mutex_unlock(lock: &drm_global_mutex);
401 drm_minor_release(minor);
402 return retcode;
403}
404EXPORT_SYMBOL(drm_open);
405
406static void drm_lastclose(struct drm_device *dev)
407{
408 drm_client_dev_restore(dev, force: false);
409
410 if (dev_is_pci(dev->dev))
411 vga_switcheroo_process_delayed_switch();
412}
413
414/**
415 * drm_release - release method for DRM file
416 * @inode: device inode
417 * @filp: file pointer.
418 *
419 * This function must be used by drivers as their &file_operations.release
420 * method. It frees any resources associated with the open file. If this
421 * is the last open file for the DRM device, it also restores the active
422 * in-kernel DRM client.
423 *
424 * RETURNS:
425 * Always succeeds and returns 0.
426 */
427int drm_release(struct inode *inode, struct file *filp)
428{
429 struct drm_file *file_priv = filp->private_data;
430 struct drm_minor *minor = file_priv->minor;
431 struct drm_device *dev = minor->dev;
432
433 if (drm_dev_needs_global_mutex(dev))
434 mutex_lock(&drm_global_mutex);
435
436 drm_dbg_core(dev, "open_count = %d\n", atomic_read(&dev->open_count));
437
438 drm_close_helper(filp);
439
440 if (atomic_dec_and_test(v: &dev->open_count))
441 drm_lastclose(dev);
442
443 if (drm_dev_needs_global_mutex(dev))
444 mutex_unlock(lock: &drm_global_mutex);
445
446 drm_minor_release(minor);
447
448 return 0;
449}
450EXPORT_SYMBOL(drm_release);
451
452void drm_file_update_pid(struct drm_file *filp)
453{
454 struct drm_device *dev;
455 struct pid *pid, *old;
456
457 /*
458 * Master nodes need to keep the original ownership in order for
459 * drm_master_check_perm to keep working correctly. (See comment in
460 * drm_auth.c.)
461 */
462 if (filp->was_master)
463 return;
464
465 pid = task_tgid(current);
466
467 /*
468 * Quick unlocked check since the model is a single handover followed by
469 * exclusive repeated use.
470 */
471 if (pid == rcu_access_pointer(filp->pid))
472 return;
473
474 dev = filp->minor->dev;
475 mutex_lock(&dev->filelist_mutex);
476 get_pid(pid);
477 old = rcu_replace_pointer(filp->pid, pid, 1);
478 mutex_unlock(lock: &dev->filelist_mutex);
479
480 synchronize_rcu();
481 put_pid(pid: old);
482}
483
484/**
485 * drm_release_noglobal - release method for DRM file
486 * @inode: device inode
487 * @filp: file pointer.
488 *
489 * This function may be used by drivers as their &file_operations.release
490 * method. It frees any resources associated with the open file prior to taking
491 * the drm_global_mutex. If this is the last open file for the DRM device, it
492 * then restores the active in-kernel DRM client.
493 *
494 * RETURNS:
495 * Always succeeds and returns 0.
496 */
497int drm_release_noglobal(struct inode *inode, struct file *filp)
498{
499 struct drm_file *file_priv = filp->private_data;
500 struct drm_minor *minor = file_priv->minor;
501 struct drm_device *dev = minor->dev;
502
503 drm_close_helper(filp);
504
505 if (atomic_dec_and_mutex_lock(cnt: &dev->open_count, lock: &drm_global_mutex)) {
506 drm_lastclose(dev);
507 mutex_unlock(lock: &drm_global_mutex);
508 }
509
510 drm_minor_release(minor);
511
512 return 0;
513}
514EXPORT_SYMBOL(drm_release_noglobal);
515
516/**
517 * drm_read - read method for DRM file
518 * @filp: file pointer
519 * @buffer: userspace destination pointer for the read
520 * @count: count in bytes to read
521 * @offset: offset to read
522 *
523 * This function must be used by drivers as their &file_operations.read
524 * method if they use DRM events for asynchronous signalling to userspace.
525 * Since events are used by the KMS API for vblank and page flip completion this
526 * means all modern display drivers must use it.
527 *
528 * @offset is ignored, DRM events are read like a pipe. Polling support is
529 * provided by drm_poll().
530 *
531 * This function will only ever read a full event. Therefore userspace must
532 * supply a big enough buffer to fit any event to ensure forward progress. Since
533 * the maximum event space is currently 4K it's recommended to just use that for
534 * safety.
535 *
536 * RETURNS:
537 * Number of bytes read (always aligned to full events, and can be 0) or a
538 * negative error code on failure.
539 */
540ssize_t drm_read(struct file *filp, char __user *buffer,
541 size_t count, loff_t *offset)
542{
543 struct drm_file *file_priv = filp->private_data;
544 struct drm_device *dev = file_priv->minor->dev;
545 ssize_t ret;
546
547 ret = mutex_lock_interruptible(&file_priv->event_read_lock);
548 if (ret)
549 return ret;
550
551 for (;;) {
552 struct drm_pending_event *e = NULL;
553
554 spin_lock_irq(lock: &dev->event_lock);
555 if (!list_empty(head: &file_priv->event_list)) {
556 e = list_first_entry(&file_priv->event_list,
557 struct drm_pending_event, link);
558 file_priv->event_space += e->event->length;
559 list_del(entry: &e->link);
560 }
561 spin_unlock_irq(lock: &dev->event_lock);
562
563 if (e == NULL) {
564 if (ret)
565 break;
566
567 if (filp->f_flags & O_NONBLOCK) {
568 ret = -EAGAIN;
569 break;
570 }
571
572 mutex_unlock(lock: &file_priv->event_read_lock);
573 ret = wait_event_interruptible(file_priv->event_wait,
574 !list_empty(&file_priv->event_list));
575 if (ret >= 0)
576 ret = mutex_lock_interruptible(&file_priv->event_read_lock);
577 if (ret)
578 return ret;
579 } else {
580 unsigned length = e->event->length;
581
582 if (length > count - ret) {
583put_back_event:
584 spin_lock_irq(lock: &dev->event_lock);
585 file_priv->event_space -= length;
586 list_add(new: &e->link, head: &file_priv->event_list);
587 spin_unlock_irq(lock: &dev->event_lock);
588 wake_up_interruptible_poll(&file_priv->event_wait,
589 EPOLLIN | EPOLLRDNORM);
590 break;
591 }
592
593 if (copy_to_user(to: buffer + ret, from: e->event, n: length)) {
594 if (ret == 0)
595 ret = -EFAULT;
596 goto put_back_event;
597 }
598
599 ret += length;
600 kfree(objp: e);
601 }
602 }
603 mutex_unlock(lock: &file_priv->event_read_lock);
604
605 return ret;
606}
607EXPORT_SYMBOL(drm_read);
608
609/**
610 * drm_poll - poll method for DRM file
611 * @filp: file pointer
612 * @wait: poll waiter table
613 *
614 * This function must be used by drivers as their &file_operations.read method
615 * if they use DRM events for asynchronous signalling to userspace. Since
616 * events are used by the KMS API for vblank and page flip completion this means
617 * all modern display drivers must use it.
618 *
619 * See also drm_read().
620 *
621 * RETURNS:
622 * Mask of POLL flags indicating the current status of the file.
623 */
624__poll_t drm_poll(struct file *filp, struct poll_table_struct *wait)
625{
626 struct drm_file *file_priv = filp->private_data;
627 __poll_t mask = 0;
628
629 poll_wait(filp, wait_address: &file_priv->event_wait, p: wait);
630
631 if (!list_empty(head: &file_priv->event_list))
632 mask |= EPOLLIN | EPOLLRDNORM;
633
634 return mask;
635}
636EXPORT_SYMBOL(drm_poll);
637
638/**
639 * drm_event_reserve_init_locked - init a DRM event and reserve space for it
640 * @dev: DRM device
641 * @file_priv: DRM file private data
642 * @p: tracking structure for the pending event
643 * @e: actual event data to deliver to userspace
644 *
645 * This function prepares the passed in event for eventual delivery. If the event
646 * doesn't get delivered (because the IOCTL fails later on, before queuing up
647 * anything) then the even must be cancelled and freed using
648 * drm_event_cancel_free(). Successfully initialized events should be sent out
649 * using drm_send_event() or drm_send_event_locked() to signal completion of the
650 * asynchronous event to userspace.
651 *
652 * If callers embedded @p into a larger structure it must be allocated with
653 * kmalloc and @p must be the first member element.
654 *
655 * This is the locked version of drm_event_reserve_init() for callers which
656 * already hold &drm_device.event_lock.
657 *
658 * RETURNS:
659 * 0 on success or a negative error code on failure.
660 */
661int drm_event_reserve_init_locked(struct drm_device *dev,
662 struct drm_file *file_priv,
663 struct drm_pending_event *p,
664 struct drm_event *e)
665{
666 if (file_priv->event_space < e->length)
667 return -ENOMEM;
668
669 file_priv->event_space -= e->length;
670
671 p->event = e;
672 list_add(new: &p->pending_link, head: &file_priv->pending_event_list);
673 p->file_priv = file_priv;
674
675 return 0;
676}
677EXPORT_SYMBOL(drm_event_reserve_init_locked);
678
679/**
680 * drm_event_reserve_init - init a DRM event and reserve space for it
681 * @dev: DRM device
682 * @file_priv: DRM file private data
683 * @p: tracking structure for the pending event
684 * @e: actual event data to deliver to userspace
685 *
686 * This function prepares the passed in event for eventual delivery. If the event
687 * doesn't get delivered (because the IOCTL fails later on, before queuing up
688 * anything) then the even must be cancelled and freed using
689 * drm_event_cancel_free(). Successfully initialized events should be sent out
690 * using drm_send_event() or drm_send_event_locked() to signal completion of the
691 * asynchronous event to userspace.
692 *
693 * If callers embedded @p into a larger structure it must be allocated with
694 * kmalloc and @p must be the first member element.
695 *
696 * Callers which already hold &drm_device.event_lock should use
697 * drm_event_reserve_init_locked() instead.
698 *
699 * RETURNS:
700 * 0 on success or a negative error code on failure.
701 */
702int drm_event_reserve_init(struct drm_device *dev,
703 struct drm_file *file_priv,
704 struct drm_pending_event *p,
705 struct drm_event *e)
706{
707 unsigned long flags;
708 int ret;
709
710 spin_lock_irqsave(&dev->event_lock, flags);
711 ret = drm_event_reserve_init_locked(dev, file_priv, p, e);
712 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
713
714 return ret;
715}
716EXPORT_SYMBOL(drm_event_reserve_init);
717
718/**
719 * drm_event_cancel_free - free a DRM event and release its space
720 * @dev: DRM device
721 * @p: tracking structure for the pending event
722 *
723 * This function frees the event @p initialized with drm_event_reserve_init()
724 * and releases any allocated space. It is used to cancel an event when the
725 * nonblocking operation could not be submitted and needed to be aborted.
726 */
727void drm_event_cancel_free(struct drm_device *dev,
728 struct drm_pending_event *p)
729{
730 unsigned long flags;
731
732 spin_lock_irqsave(&dev->event_lock, flags);
733 if (p->file_priv) {
734 p->file_priv->event_space += p->event->length;
735 list_del(entry: &p->pending_link);
736 }
737 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
738
739 if (p->fence)
740 dma_fence_put(fence: p->fence);
741
742 kfree(objp: p);
743}
744EXPORT_SYMBOL(drm_event_cancel_free);
745
746static void drm_send_event_helper(struct drm_device *dev,
747 struct drm_pending_event *e, ktime_t timestamp)
748{
749 assert_spin_locked(&dev->event_lock);
750
751 if (e->completion) {
752 complete_all(e->completion);
753 e->completion_release(e->completion);
754 e->completion = NULL;
755 }
756
757 if (e->fence) {
758 if (timestamp)
759 dma_fence_signal_timestamp(fence: e->fence, timestamp);
760 else
761 dma_fence_signal(fence: e->fence);
762 dma_fence_put(fence: e->fence);
763 }
764
765 if (!e->file_priv) {
766 kfree(objp: e);
767 return;
768 }
769
770 list_del(entry: &e->pending_link);
771 list_add_tail(new: &e->link,
772 head: &e->file_priv->event_list);
773 wake_up_interruptible_poll(&e->file_priv->event_wait,
774 EPOLLIN | EPOLLRDNORM);
775}
776
777/**
778 * drm_send_event_timestamp_locked - send DRM event to file descriptor
779 * @dev: DRM device
780 * @e: DRM event to deliver
781 * @timestamp: timestamp to set for the fence event in kernel's CLOCK_MONOTONIC
782 * time domain
783 *
784 * This function sends the event @e, initialized with drm_event_reserve_init(),
785 * to its associated userspace DRM file. Callers must already hold
786 * &drm_device.event_lock.
787 *
788 * Note that the core will take care of unlinking and disarming events when the
789 * corresponding DRM file is closed. Drivers need not worry about whether the
790 * DRM file for this event still exists and can call this function upon
791 * completion of the asynchronous work unconditionally.
792 */
793void drm_send_event_timestamp_locked(struct drm_device *dev,
794 struct drm_pending_event *e, ktime_t timestamp)
795{
796 drm_send_event_helper(dev, e, timestamp);
797}
798EXPORT_SYMBOL(drm_send_event_timestamp_locked);
799
800/**
801 * drm_send_event_locked - send DRM event to file descriptor
802 * @dev: DRM device
803 * @e: DRM event to deliver
804 *
805 * This function sends the event @e, initialized with drm_event_reserve_init(),
806 * to its associated userspace DRM file. Callers must already hold
807 * &drm_device.event_lock, see drm_send_event() for the unlocked version.
808 *
809 * Note that the core will take care of unlinking and disarming events when the
810 * corresponding DRM file is closed. Drivers need not worry about whether the
811 * DRM file for this event still exists and can call this function upon
812 * completion of the asynchronous work unconditionally.
813 */
814void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e)
815{
816 drm_send_event_helper(dev, e, timestamp: 0);
817}
818EXPORT_SYMBOL(drm_send_event_locked);
819
820/**
821 * drm_send_event - send DRM event to file descriptor
822 * @dev: DRM device
823 * @e: DRM event to deliver
824 *
825 * This function sends the event @e, initialized with drm_event_reserve_init(),
826 * to its associated userspace DRM file. This function acquires
827 * &drm_device.event_lock, see drm_send_event_locked() for callers which already
828 * hold this lock.
829 *
830 * Note that the core will take care of unlinking and disarming events when the
831 * corresponding DRM file is closed. Drivers need not worry about whether the
832 * DRM file for this event still exists and can call this function upon
833 * completion of the asynchronous work unconditionally.
834 */
835void drm_send_event(struct drm_device *dev, struct drm_pending_event *e)
836{
837 unsigned long irqflags;
838
839 spin_lock_irqsave(&dev->event_lock, irqflags);
840 drm_send_event_helper(dev, e, timestamp: 0);
841 spin_unlock_irqrestore(lock: &dev->event_lock, flags: irqflags);
842}
843EXPORT_SYMBOL(drm_send_event);
844
845void drm_fdinfo_print_size(struct drm_printer *p,
846 const char *prefix,
847 const char *stat,
848 const char *region,
849 u64 sz)
850{
851 const char *units[] = {"", " KiB", " MiB"};
852 unsigned u;
853
854 for (u = 0; u < ARRAY_SIZE(units) - 1; u++) {
855 if (sz == 0 || !IS_ALIGNED(sz, SZ_1K))
856 break;
857 sz = div_u64(dividend: sz, SZ_1K);
858 }
859
860 drm_printf(p, f: "%s-%s-%s:\t%llu%s\n",
861 prefix, stat, region, sz, units[u]);
862}
863EXPORT_SYMBOL(drm_fdinfo_print_size);
864
865int drm_memory_stats_is_zero(const struct drm_memory_stats *stats)
866{
867 return (stats->shared == 0 &&
868 stats->private == 0 &&
869 stats->resident == 0 &&
870 stats->purgeable == 0 &&
871 stats->active == 0);
872}
873EXPORT_SYMBOL(drm_memory_stats_is_zero);
874
875/**
876 * drm_print_memory_stats - A helper to print memory stats
877 * @p: The printer to print output to
878 * @stats: The collected memory stats
879 * @supported_status: Bitmask of optional stats which are available
880 * @region: The memory region
881 *
882 */
883void drm_print_memory_stats(struct drm_printer *p,
884 const struct drm_memory_stats *stats,
885 enum drm_gem_object_status supported_status,
886 const char *region)
887{
888 const char *prefix = "drm";
889
890 drm_fdinfo_print_size(p, prefix, "total", region,
891 stats->private + stats->shared);
892 drm_fdinfo_print_size(p, prefix, "shared", region, stats->shared);
893
894 if (supported_status & DRM_GEM_OBJECT_ACTIVE)
895 drm_fdinfo_print_size(p, prefix, "active", region, stats->active);
896
897 if (supported_status & DRM_GEM_OBJECT_RESIDENT)
898 drm_fdinfo_print_size(p, prefix, "resident", region,
899 stats->resident);
900
901 if (supported_status & DRM_GEM_OBJECT_PURGEABLE)
902 drm_fdinfo_print_size(p, prefix, "purgeable", region,
903 stats->purgeable);
904}
905EXPORT_SYMBOL(drm_print_memory_stats);
906
907/**
908 * drm_show_memory_stats - Helper to collect and show standard fdinfo memory stats
909 * @p: the printer to print output to
910 * @file: the DRM file
911 *
912 * Helper to iterate over GEM objects with a handle allocated in the specified
913 * file.
914 */
915void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file)
916{
917 struct drm_gem_object *obj;
918 struct drm_memory_stats status = {};
919 enum drm_gem_object_status supported_status = 0;
920 int id;
921
922 spin_lock(lock: &file->table_lock);
923 idr_for_each_entry (&file->object_idr, obj, id) {
924 enum drm_gem_object_status s = 0;
925 size_t add_size = (obj->funcs && obj->funcs->rss) ?
926 obj->funcs->rss(obj) : obj->size;
927
928 if (obj->funcs && obj->funcs->status) {
929 s = obj->funcs->status(obj);
930 supported_status |= s;
931 }
932
933 if (drm_gem_object_is_shared_for_memory_stats(obj))
934 status.shared += obj->size;
935 else
936 status.private += obj->size;
937
938 if (s & DRM_GEM_OBJECT_RESIDENT) {
939 status.resident += add_size;
940 } else {
941 /* If already purged or not yet backed by pages, don't
942 * count it as purgeable:
943 */
944 s &= ~DRM_GEM_OBJECT_PURGEABLE;
945 }
946
947 if (!dma_resv_test_signaled(obj: obj->resv, usage: dma_resv_usage_rw(write: true))) {
948 status.active += add_size;
949 supported_status |= DRM_GEM_OBJECT_ACTIVE;
950
951 /* If still active, don't count as purgeable: */
952 s &= ~DRM_GEM_OBJECT_PURGEABLE;
953 }
954
955 if (s & DRM_GEM_OBJECT_PURGEABLE)
956 status.purgeable += add_size;
957 }
958 spin_unlock(lock: &file->table_lock);
959
960 drm_print_memory_stats(p, &status, supported_status, "memory");
961}
962EXPORT_SYMBOL(drm_show_memory_stats);
963
964/**
965 * drm_show_fdinfo - helper for drm file fops
966 * @m: output stream
967 * @f: the device file instance
968 *
969 * Helper to implement fdinfo, for userspace to query usage stats, etc, of a
970 * process using the GPU. See also &drm_driver.show_fdinfo.
971 *
972 * For text output format description please see Documentation/gpu/drm-usage-stats.rst
973 */
974void drm_show_fdinfo(struct seq_file *m, struct file *f)
975{
976 struct drm_file *file = f->private_data;
977 struct drm_device *dev = file->minor->dev;
978 struct drm_printer p = drm_seq_file_printer(f: m);
979 int idx;
980
981 if (!drm_dev_enter(dev, idx: &idx))
982 return;
983
984 drm_printf(p: &p, f: "drm-driver:\t%s\n", dev->driver->name);
985 drm_printf(p: &p, f: "drm-client-id:\t%llu\n", file->client_id);
986
987 if (dev_is_pci(dev->dev)) {
988 struct pci_dev *pdev = to_pci_dev(dev->dev);
989
990 drm_printf(p: &p, f: "drm-pdev:\t%04x:%02x:%02x.%d\n",
991 pci_domain_nr(bus: pdev->bus), pdev->bus->number,
992 PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
993 }
994
995 mutex_lock(&file->client_name_lock);
996 if (file->client_name)
997 drm_printf(p: &p, f: "drm-client-name:\t%s\n", file->client_name);
998 mutex_unlock(lock: &file->client_name_lock);
999
1000 if (dev->driver->show_fdinfo)
1001 dev->driver->show_fdinfo(&p, file);
1002
1003 drm_dev_exit(idx);
1004}
1005EXPORT_SYMBOL(drm_show_fdinfo);
1006
1007/**
1008 * drm_file_err - log process name, pid and client_name associated with a drm_file
1009 * @file_priv: context of interest for process name and pid
1010 * @fmt: printf() like format string
1011 *
1012 * Helper function for clients which needs to log process details such
1013 * as name and pid etc along with user logs.
1014 */
1015void drm_file_err(struct drm_file *file_priv, const char *fmt, ...)
1016{
1017 va_list args;
1018 struct va_format vaf;
1019 struct pid *pid;
1020 struct task_struct *task;
1021 struct drm_device *dev = file_priv->minor->dev;
1022
1023 va_start(args, fmt);
1024 vaf.fmt = fmt;
1025 vaf.va = &args;
1026
1027 mutex_lock(&file_priv->client_name_lock);
1028 rcu_read_lock();
1029 pid = rcu_dereference(file_priv->pid);
1030 task = pid_task(pid, PIDTYPE_TGID);
1031
1032 drm_err(dev, "comm: %s pid: %d client-id:%llu client: %s ... %pV",
1033 task ? task->comm : "Unset",
1034 task ? task->pid : 0, file_priv->client_id,
1035 file_priv->client_name ?: "Unset", &vaf);
1036
1037 va_end(args);
1038 rcu_read_unlock();
1039 mutex_unlock(lock: &file_priv->client_name_lock);
1040}
1041EXPORT_SYMBOL(drm_file_err);
1042
1043/**
1044 * mock_drm_getfile - Create a new struct file for the drm device
1045 * @minor: drm minor to wrap (e.g. #drm_device.primary)
1046 * @flags: file creation mode (O_RDWR etc)
1047 *
1048 * This create a new struct file that wraps a DRM file context around a
1049 * DRM minor. This mimicks userspace opening e.g. /dev/dri/card0, but without
1050 * invoking userspace. The struct file may be operated on using its f_op
1051 * (the drm_device.driver.fops) to mimick userspace operations, or be supplied
1052 * to userspace facing functions as an internal/anonymous client.
1053 *
1054 * RETURNS:
1055 * Pointer to newly created struct file, ERR_PTR on failure.
1056 */
1057struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags)
1058{
1059 struct drm_device *dev = minor->dev;
1060 struct drm_file *priv;
1061 struct file *file;
1062
1063 priv = drm_file_alloc(minor);
1064 if (IS_ERR(ptr: priv))
1065 return ERR_CAST(ptr: priv);
1066
1067 file = anon_inode_getfile(name: "drm", fops: dev->driver->fops, priv, flags);
1068 if (IS_ERR(ptr: file)) {
1069 drm_file_free(file: priv);
1070 return file;
1071 }
1072
1073 /* Everyone shares a single global address space */
1074 file->f_mapping = dev->anon_inode->i_mapping;
1075
1076 drm_dev_get(dev);
1077 priv->filp = file;
1078
1079 return file;
1080}
1081EXPORT_SYMBOL_FOR_TESTS_ONLY(mock_drm_getfile);
1082

source code of linux/drivers/gpu/drm/drm_file.c