Line data Source code
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/file.h>
37 : #include <linux/module.h>
38 : #include <linux/pci.h>
39 : #include <linux/poll.h>
40 : #include <linux/slab.h>
41 :
42 : #include <drm/drm_client.h>
43 : #include <drm/drm_drv.h>
44 : #include <drm/drm_file.h>
45 : #include <drm/drm_gem.h>
46 : #include <drm/drm_print.h>
47 :
48 : #include "drm_crtc_internal.h"
49 : #include "drm_internal.h"
50 : #include "drm_legacy.h"
51 :
52 : /* from BKL pushdown */
53 : DEFINE_MUTEX(drm_global_mutex);
54 :
55 0 : bool drm_dev_needs_global_mutex(struct drm_device *dev)
56 : {
57 : /*
58 : * Legacy drivers rely on all kinds of BKL locking semantics, don't
59 : * bother. They also still need BKL locking for their ioctls, so better
60 : * safe than sorry.
61 : */
62 0 : if (drm_core_check_feature(dev, DRIVER_LEGACY))
63 : return true;
64 :
65 : /*
66 : * The deprecated ->load callback must be called after the driver is
67 : * already registered. This means such drivers rely on the BKL to make
68 : * sure an open can't proceed until the driver is actually fully set up.
69 : * Similar hilarity holds for the unload callback.
70 : */
71 0 : if (dev->driver->load || dev->driver->unload)
72 : return true;
73 :
74 : /*
75 : * Drivers with the lastclose callback assume that it's synchronized
76 : * against concurrent opens, which again needs the BKL. The proper fix
77 : * is to use the drm_client infrastructure with proper locking for each
78 : * client.
79 : */
80 0 : if (dev->driver->lastclose)
81 : return true;
82 :
83 0 : return false;
84 : }
85 :
86 : /**
87 : * DOC: file operations
88 : *
89 : * Drivers must define the file operations structure that forms the DRM
90 : * userspace API entry point, even though most of those operations are
91 : * implemented in the DRM core. The resulting &struct file_operations must be
92 : * stored in the &drm_driver.fops field. The mandatory functions are drm_open(),
93 : * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled
94 : * Note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n, so there's no
95 : * need to sprinkle #ifdef into the code. Drivers which implement private ioctls
96 : * that require 32/64 bit compatibility support must provide their own
97 : * &file_operations.compat_ioctl handler that processes private ioctls and calls
98 : * drm_compat_ioctl() for core ioctls.
99 : *
100 : * In addition drm_read() and drm_poll() provide support for DRM events. DRM
101 : * events are a generic and extensible means to send asynchronous events to
102 : * userspace through the file descriptor. They are used to send vblank event and
103 : * page flip completions by the KMS API. But drivers can also use it for their
104 : * own needs, e.g. to signal completion of rendering.
105 : *
106 : * For the driver-side event interface see drm_event_reserve_init() and
107 : * drm_send_event() as the main starting points.
108 : *
109 : * The memory mapping implementation will vary depending on how the driver
110 : * manages memory. Legacy drivers will use the deprecated drm_legacy_mmap()
111 : * function, modern drivers should use one of the provided memory-manager
112 : * specific implementations. For GEM-based drivers this is drm_gem_mmap().
113 : *
114 : * No other file operations are supported by the DRM userspace API. Overall the
115 : * following is an example &file_operations structure::
116 : *
117 : * static const example_drm_fops = {
118 : * .owner = THIS_MODULE,
119 : * .open = drm_open,
120 : * .release = drm_release,
121 : * .unlocked_ioctl = drm_ioctl,
122 : * .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n
123 : * .poll = drm_poll,
124 : * .read = drm_read,
125 : * .llseek = no_llseek,
126 : * .mmap = drm_gem_mmap,
127 : * };
128 : *
129 : * For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for
130 : * DMA based drivers there is the DEFINE_DRM_GEM_DMA_FOPS() macro to make this
131 : * simpler.
132 : *
133 : * The driver's &file_operations must be stored in &drm_driver.fops.
134 : *
135 : * For driver-private IOCTL handling see the more detailed discussion in
136 : * :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`.
137 : */
138 :
139 : /**
140 : * drm_file_alloc - allocate file context
141 : * @minor: minor to allocate on
142 : *
143 : * This allocates a new DRM file context. It is not linked into any context and
144 : * can be used by the caller freely. Note that the context keeps a pointer to
145 : * @minor, so it must be freed before @minor is.
146 : *
147 : * RETURNS:
148 : * Pointer to newly allocated context, ERR_PTR on failure.
149 : */
150 0 : struct drm_file *drm_file_alloc(struct drm_minor *minor)
151 : {
152 : static atomic64_t ident = ATOMIC_INIT(0);
153 0 : struct drm_device *dev = minor->dev;
154 : struct drm_file *file;
155 : int ret;
156 :
157 0 : file = kzalloc(sizeof(*file), GFP_KERNEL);
158 0 : if (!file)
159 : return ERR_PTR(-ENOMEM);
160 :
161 : /* Get a unique identifier for fdinfo: */
162 0 : file->client_id = atomic64_inc_return(&ident);
163 0 : file->pid = get_pid(task_tgid(current));
164 0 : file->minor = minor;
165 :
166 : /* for compatibility root is always authenticated */
167 0 : file->authenticated = capable(CAP_SYS_ADMIN);
168 :
169 0 : INIT_LIST_HEAD(&file->lhead);
170 0 : INIT_LIST_HEAD(&file->fbs);
171 0 : mutex_init(&file->fbs_lock);
172 0 : INIT_LIST_HEAD(&file->blobs);
173 0 : INIT_LIST_HEAD(&file->pending_event_list);
174 0 : INIT_LIST_HEAD(&file->event_list);
175 0 : init_waitqueue_head(&file->event_wait);
176 0 : file->event_space = 4096; /* set aside 4k for event buffer */
177 :
178 0 : spin_lock_init(&file->master_lookup_lock);
179 0 : mutex_init(&file->event_read_lock);
180 :
181 0 : if (drm_core_check_feature(dev, DRIVER_GEM))
182 0 : drm_gem_open(dev, file);
183 :
184 0 : if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
185 0 : drm_syncobj_open(file);
186 :
187 0 : drm_prime_init_file_private(&file->prime);
188 :
189 0 : if (dev->driver->open) {
190 0 : ret = dev->driver->open(dev, file);
191 0 : if (ret < 0)
192 : goto out_prime_destroy;
193 : }
194 :
195 : return file;
196 :
197 : out_prime_destroy:
198 0 : drm_prime_destroy_file_private(&file->prime);
199 0 : if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
200 0 : drm_syncobj_release(file);
201 0 : if (drm_core_check_feature(dev, DRIVER_GEM))
202 0 : drm_gem_release(dev, file);
203 0 : put_pid(file->pid);
204 0 : kfree(file);
205 :
206 0 : return ERR_PTR(ret);
207 : }
208 :
209 0 : static void drm_events_release(struct drm_file *file_priv)
210 : {
211 0 : struct drm_device *dev = file_priv->minor->dev;
212 : struct drm_pending_event *e, *et;
213 : unsigned long flags;
214 :
215 0 : spin_lock_irqsave(&dev->event_lock, flags);
216 :
217 : /* Unlink pending events */
218 0 : list_for_each_entry_safe(e, et, &file_priv->pending_event_list,
219 : pending_link) {
220 0 : list_del(&e->pending_link);
221 0 : e->file_priv = NULL;
222 : }
223 :
224 : /* Remove unconsumed events */
225 0 : list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
226 0 : list_del(&e->link);
227 0 : kfree(e);
228 : }
229 :
230 0 : spin_unlock_irqrestore(&dev->event_lock, flags);
231 0 : }
232 :
233 : /**
234 : * drm_file_free - free file context
235 : * @file: context to free, or NULL
236 : *
237 : * This destroys and deallocates a DRM file context previously allocated via
238 : * drm_file_alloc(). The caller must make sure to unlink it from any contexts
239 : * before calling this.
240 : *
241 : * If NULL is passed, this is a no-op.
242 : */
243 0 : void drm_file_free(struct drm_file *file)
244 : {
245 : struct drm_device *dev;
246 :
247 0 : if (!file)
248 : return;
249 :
250 0 : dev = file->minor->dev;
251 :
252 0 : drm_dbg_core(dev, "comm=\"%s\", pid=%d, dev=0x%lx, open_count=%d\n",
253 : current->comm, task_pid_nr(current),
254 : (long)old_encode_dev(file->minor->kdev->devt),
255 : atomic_read(&dev->open_count));
256 :
257 : #ifdef CONFIG_DRM_LEGACY
258 : if (drm_core_check_feature(dev, DRIVER_LEGACY) &&
259 : dev->driver->preclose)
260 : dev->driver->preclose(dev, file);
261 : #endif
262 :
263 0 : if (drm_core_check_feature(dev, DRIVER_LEGACY))
264 : drm_legacy_lock_release(dev, file->filp);
265 :
266 0 : if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
267 : drm_legacy_reclaim_buffers(dev, file);
268 :
269 0 : drm_events_release(file);
270 :
271 0 : if (drm_core_check_feature(dev, DRIVER_MODESET)) {
272 0 : drm_fb_release(file);
273 0 : drm_property_destroy_user_blobs(dev, file);
274 : }
275 :
276 0 : if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
277 0 : drm_syncobj_release(file);
278 :
279 0 : if (drm_core_check_feature(dev, DRIVER_GEM))
280 0 : drm_gem_release(dev, file);
281 :
282 0 : drm_legacy_ctxbitmap_flush(dev, file);
283 :
284 0 : if (drm_is_primary_client(file))
285 0 : drm_master_release(file);
286 :
287 0 : if (dev->driver->postclose)
288 0 : dev->driver->postclose(dev, file);
289 :
290 0 : drm_prime_destroy_file_private(&file->prime);
291 :
292 0 : WARN_ON(!list_empty(&file->event_list));
293 :
294 0 : put_pid(file->pid);
295 0 : kfree(file);
296 : }
297 :
298 0 : static void drm_close_helper(struct file *filp)
299 : {
300 0 : struct drm_file *file_priv = filp->private_data;
301 0 : struct drm_device *dev = file_priv->minor->dev;
302 :
303 0 : mutex_lock(&dev->filelist_mutex);
304 0 : list_del(&file_priv->lhead);
305 0 : mutex_unlock(&dev->filelist_mutex);
306 :
307 0 : drm_file_free(file_priv);
308 0 : }
309 :
310 : /*
311 : * Check whether DRI will run on this CPU.
312 : *
313 : * \return non-zero if the DRI will run on this CPU, or zero otherwise.
314 : */
315 : static int drm_cpu_valid(void)
316 : {
317 : #if defined(__sparc__) && !defined(__sparc_v9__)
318 : return 0; /* No cmpxchg before v9 sparc. */
319 : #endif
320 : return 1;
321 : }
322 :
323 : /*
324 : * Called whenever a process opens a drm node
325 : *
326 : * \param filp file pointer.
327 : * \param minor acquired minor-object.
328 : * \return zero on success or a negative number on failure.
329 : *
330 : * Creates and initializes a drm_file structure for the file private data in \p
331 : * filp and add it into the double linked list in \p dev.
332 : */
333 0 : int drm_open_helper(struct file *filp, struct drm_minor *minor)
334 : {
335 0 : struct drm_device *dev = minor->dev;
336 : struct drm_file *priv;
337 : int ret;
338 :
339 0 : if (filp->f_flags & O_EXCL)
340 : return -EBUSY; /* No exclusive opens */
341 : if (!drm_cpu_valid())
342 : return -EINVAL;
343 0 : if (dev->switch_power_state != DRM_SWITCH_POWER_ON &&
344 : dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
345 : return -EINVAL;
346 :
347 0 : drm_dbg_core(dev, "comm=\"%s\", pid=%d, minor=%d\n",
348 : current->comm, task_pid_nr(current), minor->index);
349 :
350 0 : priv = drm_file_alloc(minor);
351 0 : if (IS_ERR(priv))
352 0 : return PTR_ERR(priv);
353 :
354 0 : if (drm_is_primary_client(priv)) {
355 0 : ret = drm_master_open(priv);
356 0 : if (ret) {
357 0 : drm_file_free(priv);
358 0 : return ret;
359 : }
360 : }
361 :
362 0 : filp->private_data = priv;
363 0 : filp->f_mode |= FMODE_UNSIGNED_OFFSET;
364 0 : priv->filp = filp;
365 :
366 0 : mutex_lock(&dev->filelist_mutex);
367 0 : list_add(&priv->lhead, &dev->filelist);
368 0 : mutex_unlock(&dev->filelist_mutex);
369 :
370 : #ifdef CONFIG_DRM_LEGACY
371 : #ifdef __alpha__
372 : /*
373 : * Default the hose
374 : */
375 : if (!dev->hose) {
376 : struct pci_dev *pci_dev;
377 :
378 : pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
379 : if (pci_dev) {
380 : dev->hose = pci_dev->sysdata;
381 : pci_dev_put(pci_dev);
382 : }
383 : if (!dev->hose) {
384 : struct pci_bus *b = list_entry(pci_root_buses.next,
385 : struct pci_bus, node);
386 : if (b)
387 : dev->hose = b->sysdata;
388 : }
389 : }
390 : #endif
391 : #endif
392 :
393 0 : return 0;
394 : }
395 :
396 : /**
397 : * drm_open - open method for DRM file
398 : * @inode: device inode
399 : * @filp: file pointer.
400 : *
401 : * This function must be used by drivers as their &file_operations.open method.
402 : * It looks up the correct DRM device and instantiates all the per-file
403 : * resources for it. It also calls the &drm_driver.open driver callback.
404 : *
405 : * RETURNS:
406 : *
407 : * 0 on success or negative errno value on failure.
408 : */
409 0 : int drm_open(struct inode *inode, struct file *filp)
410 : {
411 : struct drm_device *dev;
412 : struct drm_minor *minor;
413 : int retcode;
414 0 : int need_setup = 0;
415 :
416 0 : minor = drm_minor_acquire(iminor(inode));
417 0 : if (IS_ERR(minor))
418 0 : return PTR_ERR(minor);
419 :
420 0 : dev = minor->dev;
421 0 : if (drm_dev_needs_global_mutex(dev))
422 0 : mutex_lock(&drm_global_mutex);
423 :
424 0 : if (!atomic_fetch_inc(&dev->open_count))
425 : need_setup = 1;
426 :
427 : /* share address_space across all char-devs of a single device */
428 0 : filp->f_mapping = dev->anon_inode->i_mapping;
429 :
430 0 : retcode = drm_open_helper(filp, minor);
431 0 : if (retcode)
432 : goto err_undo;
433 : if (need_setup) {
434 : retcode = drm_legacy_setup(dev);
435 : if (retcode) {
436 : drm_close_helper(filp);
437 : goto err_undo;
438 : }
439 : }
440 :
441 0 : if (drm_dev_needs_global_mutex(dev))
442 0 : mutex_unlock(&drm_global_mutex);
443 :
444 : return 0;
445 :
446 : err_undo:
447 0 : atomic_dec(&dev->open_count);
448 0 : if (drm_dev_needs_global_mutex(dev))
449 0 : mutex_unlock(&drm_global_mutex);
450 0 : drm_minor_release(minor);
451 0 : return retcode;
452 : }
453 : EXPORT_SYMBOL(drm_open);
454 :
455 0 : void drm_lastclose(struct drm_device * dev)
456 : {
457 0 : drm_dbg_core(dev, "\n");
458 :
459 0 : if (dev->driver->lastclose)
460 0 : dev->driver->lastclose(dev);
461 0 : drm_dbg_core(dev, "driver lastclose completed\n");
462 :
463 0 : if (drm_core_check_feature(dev, DRIVER_LEGACY))
464 : drm_legacy_dev_reinit(dev);
465 :
466 0 : drm_client_dev_restore(dev);
467 0 : }
468 :
469 : /**
470 : * drm_release - release method for DRM file
471 : * @inode: device inode
472 : * @filp: file pointer.
473 : *
474 : * This function must be used by drivers as their &file_operations.release
475 : * method. It frees any resources associated with the open file, and calls the
476 : * &drm_driver.postclose driver callback. If this is the last open file for the
477 : * DRM device also proceeds to call the &drm_driver.lastclose driver callback.
478 : *
479 : * RETURNS:
480 : *
481 : * Always succeeds and returns 0.
482 : */
483 0 : int drm_release(struct inode *inode, struct file *filp)
484 : {
485 0 : struct drm_file *file_priv = filp->private_data;
486 0 : struct drm_minor *minor = file_priv->minor;
487 0 : struct drm_device *dev = minor->dev;
488 :
489 0 : if (drm_dev_needs_global_mutex(dev))
490 0 : mutex_lock(&drm_global_mutex);
491 :
492 0 : drm_dbg_core(dev, "open_count = %d\n", atomic_read(&dev->open_count));
493 :
494 0 : drm_close_helper(filp);
495 :
496 0 : if (atomic_dec_and_test(&dev->open_count))
497 0 : drm_lastclose(dev);
498 :
499 0 : if (drm_dev_needs_global_mutex(dev))
500 0 : mutex_unlock(&drm_global_mutex);
501 :
502 0 : drm_minor_release(minor);
503 :
504 0 : return 0;
505 : }
506 : EXPORT_SYMBOL(drm_release);
507 :
508 : /**
509 : * drm_release_noglobal - release method for DRM file
510 : * @inode: device inode
511 : * @filp: file pointer.
512 : *
513 : * This function may be used by drivers as their &file_operations.release
514 : * method. It frees any resources associated with the open file prior to taking
515 : * the drm_global_mutex, which then calls the &drm_driver.postclose driver
516 : * callback. If this is the last open file for the DRM device also proceeds to
517 : * call the &drm_driver.lastclose driver callback.
518 : *
519 : * RETURNS:
520 : *
521 : * Always succeeds and returns 0.
522 : */
523 0 : int drm_release_noglobal(struct inode *inode, struct file *filp)
524 : {
525 0 : struct drm_file *file_priv = filp->private_data;
526 0 : struct drm_minor *minor = file_priv->minor;
527 0 : struct drm_device *dev = minor->dev;
528 :
529 0 : drm_close_helper(filp);
530 :
531 0 : if (atomic_dec_and_mutex_lock(&dev->open_count, &drm_global_mutex)) {
532 0 : drm_lastclose(dev);
533 0 : mutex_unlock(&drm_global_mutex);
534 : }
535 :
536 0 : drm_minor_release(minor);
537 :
538 0 : return 0;
539 : }
540 : EXPORT_SYMBOL(drm_release_noglobal);
541 :
542 : /**
543 : * drm_read - read method for DRM file
544 : * @filp: file pointer
545 : * @buffer: userspace destination pointer for the read
546 : * @count: count in bytes to read
547 : * @offset: offset to read
548 : *
549 : * This function must be used by drivers as their &file_operations.read
550 : * method if they use DRM events for asynchronous signalling to userspace.
551 : * Since events are used by the KMS API for vblank and page flip completion this
552 : * means all modern display drivers must use it.
553 : *
554 : * @offset is ignored, DRM events are read like a pipe. Polling support is
555 : * provided by drm_poll().
556 : *
557 : * This function will only ever read a full event. Therefore userspace must
558 : * supply a big enough buffer to fit any event to ensure forward progress. Since
559 : * the maximum event space is currently 4K it's recommended to just use that for
560 : * safety.
561 : *
562 : * RETURNS:
563 : *
564 : * Number of bytes read (always aligned to full events, and can be 0) or a
565 : * negative error code on failure.
566 : */
567 0 : ssize_t drm_read(struct file *filp, char __user *buffer,
568 : size_t count, loff_t *offset)
569 : {
570 0 : struct drm_file *file_priv = filp->private_data;
571 0 : struct drm_device *dev = file_priv->minor->dev;
572 : ssize_t ret;
573 :
574 0 : ret = mutex_lock_interruptible(&file_priv->event_read_lock);
575 0 : if (ret)
576 : return ret;
577 :
578 : for (;;) {
579 0 : struct drm_pending_event *e = NULL;
580 :
581 0 : spin_lock_irq(&dev->event_lock);
582 0 : if (!list_empty(&file_priv->event_list)) {
583 0 : e = list_first_entry(&file_priv->event_list,
584 : struct drm_pending_event, link);
585 0 : file_priv->event_space += e->event->length;
586 0 : list_del(&e->link);
587 : }
588 0 : spin_unlock_irq(&dev->event_lock);
589 :
590 0 : if (e == NULL) {
591 0 : if (ret)
592 : break;
593 :
594 0 : if (filp->f_flags & O_NONBLOCK) {
595 : ret = -EAGAIN;
596 : break;
597 : }
598 :
599 0 : mutex_unlock(&file_priv->event_read_lock);
600 0 : ret = wait_event_interruptible(file_priv->event_wait,
601 : !list_empty(&file_priv->event_list));
602 0 : if (ret >= 0)
603 0 : ret = mutex_lock_interruptible(&file_priv->event_read_lock);
604 0 : if (ret)
605 : return ret;
606 : } else {
607 0 : unsigned length = e->event->length;
608 :
609 0 : if (length > count - ret) {
610 : put_back_event:
611 0 : spin_lock_irq(&dev->event_lock);
612 0 : file_priv->event_space -= length;
613 0 : list_add(&e->link, &file_priv->event_list);
614 0 : spin_unlock_irq(&dev->event_lock);
615 0 : wake_up_interruptible_poll(&file_priv->event_wait,
616 : EPOLLIN | EPOLLRDNORM);
617 0 : break;
618 : }
619 :
620 0 : if (copy_to_user(buffer + ret, e->event, length)) {
621 0 : if (ret == 0)
622 0 : ret = -EFAULT;
623 : goto put_back_event;
624 : }
625 :
626 0 : ret += length;
627 0 : kfree(e);
628 : }
629 : }
630 0 : mutex_unlock(&file_priv->event_read_lock);
631 :
632 0 : return ret;
633 : }
634 : EXPORT_SYMBOL(drm_read);
635 :
636 : /**
637 : * drm_poll - poll method for DRM file
638 : * @filp: file pointer
639 : * @wait: poll waiter table
640 : *
641 : * This function must be used by drivers as their &file_operations.read method
642 : * if they use DRM events for asynchronous signalling to userspace. Since
643 : * events are used by the KMS API for vblank and page flip completion this means
644 : * all modern display drivers must use it.
645 : *
646 : * See also drm_read().
647 : *
648 : * RETURNS:
649 : *
650 : * Mask of POLL flags indicating the current status of the file.
651 : */
652 0 : __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait)
653 : {
654 0 : struct drm_file *file_priv = filp->private_data;
655 0 : __poll_t mask = 0;
656 :
657 0 : poll_wait(filp, &file_priv->event_wait, wait);
658 :
659 0 : if (!list_empty(&file_priv->event_list))
660 0 : mask |= EPOLLIN | EPOLLRDNORM;
661 :
662 0 : return mask;
663 : }
664 : EXPORT_SYMBOL(drm_poll);
665 :
666 : /**
667 : * drm_event_reserve_init_locked - init a DRM event and reserve space for it
668 : * @dev: DRM device
669 : * @file_priv: DRM file private data
670 : * @p: tracking structure for the pending event
671 : * @e: actual event data to deliver to userspace
672 : *
673 : * This function prepares the passed in event for eventual delivery. If the event
674 : * doesn't get delivered (because the IOCTL fails later on, before queuing up
675 : * anything) then the even must be cancelled and freed using
676 : * drm_event_cancel_free(). Successfully initialized events should be sent out
677 : * using drm_send_event() or drm_send_event_locked() to signal completion of the
678 : * asynchronous event to userspace.
679 : *
680 : * If callers embedded @p into a larger structure it must be allocated with
681 : * kmalloc and @p must be the first member element.
682 : *
683 : * This is the locked version of drm_event_reserve_init() for callers which
684 : * already hold &drm_device.event_lock.
685 : *
686 : * RETURNS:
687 : *
688 : * 0 on success or a negative error code on failure.
689 : */
690 0 : int drm_event_reserve_init_locked(struct drm_device *dev,
691 : struct drm_file *file_priv,
692 : struct drm_pending_event *p,
693 : struct drm_event *e)
694 : {
695 0 : if (file_priv->event_space < e->length)
696 : return -ENOMEM;
697 :
698 0 : file_priv->event_space -= e->length;
699 :
700 0 : p->event = e;
701 0 : list_add(&p->pending_link, &file_priv->pending_event_list);
702 0 : p->file_priv = file_priv;
703 :
704 0 : return 0;
705 : }
706 : EXPORT_SYMBOL(drm_event_reserve_init_locked);
707 :
708 : /**
709 : * drm_event_reserve_init - init a DRM event and reserve space for it
710 : * @dev: DRM device
711 : * @file_priv: DRM file private data
712 : * @p: tracking structure for the pending event
713 : * @e: actual event data to deliver to userspace
714 : *
715 : * This function prepares the passed in event for eventual delivery. If the event
716 : * doesn't get delivered (because the IOCTL fails later on, before queuing up
717 : * anything) then the even must be cancelled and freed using
718 : * drm_event_cancel_free(). Successfully initialized events should be sent out
719 : * using drm_send_event() or drm_send_event_locked() to signal completion of the
720 : * asynchronous event to userspace.
721 : *
722 : * If callers embedded @p into a larger structure it must be allocated with
723 : * kmalloc and @p must be the first member element.
724 : *
725 : * Callers which already hold &drm_device.event_lock should use
726 : * drm_event_reserve_init_locked() instead.
727 : *
728 : * RETURNS:
729 : *
730 : * 0 on success or a negative error code on failure.
731 : */
732 0 : int drm_event_reserve_init(struct drm_device *dev,
733 : struct drm_file *file_priv,
734 : struct drm_pending_event *p,
735 : struct drm_event *e)
736 : {
737 : unsigned long flags;
738 : int ret;
739 :
740 0 : spin_lock_irqsave(&dev->event_lock, flags);
741 0 : ret = drm_event_reserve_init_locked(dev, file_priv, p, e);
742 0 : spin_unlock_irqrestore(&dev->event_lock, flags);
743 :
744 0 : return ret;
745 : }
746 : EXPORT_SYMBOL(drm_event_reserve_init);
747 :
748 : /**
749 : * drm_event_cancel_free - free a DRM event and release its space
750 : * @dev: DRM device
751 : * @p: tracking structure for the pending event
752 : *
753 : * This function frees the event @p initialized with drm_event_reserve_init()
754 : * and releases any allocated space. It is used to cancel an event when the
755 : * nonblocking operation could not be submitted and needed to be aborted.
756 : */
757 0 : void drm_event_cancel_free(struct drm_device *dev,
758 : struct drm_pending_event *p)
759 : {
760 : unsigned long flags;
761 :
762 0 : spin_lock_irqsave(&dev->event_lock, flags);
763 0 : if (p->file_priv) {
764 0 : p->file_priv->event_space += p->event->length;
765 0 : list_del(&p->pending_link);
766 : }
767 0 : spin_unlock_irqrestore(&dev->event_lock, flags);
768 :
769 0 : if (p->fence)
770 0 : dma_fence_put(p->fence);
771 :
772 0 : kfree(p);
773 0 : }
774 : EXPORT_SYMBOL(drm_event_cancel_free);
775 :
776 0 : static void drm_send_event_helper(struct drm_device *dev,
777 : struct drm_pending_event *e, ktime_t timestamp)
778 : {
779 : assert_spin_locked(&dev->event_lock);
780 :
781 0 : if (e->completion) {
782 0 : complete_all(e->completion);
783 0 : e->completion_release(e->completion);
784 0 : e->completion = NULL;
785 : }
786 :
787 0 : if (e->fence) {
788 0 : if (timestamp)
789 0 : dma_fence_signal_timestamp(e->fence, timestamp);
790 : else
791 0 : dma_fence_signal(e->fence);
792 0 : dma_fence_put(e->fence);
793 : }
794 :
795 0 : if (!e->file_priv) {
796 0 : kfree(e);
797 : return;
798 : }
799 :
800 0 : list_del(&e->pending_link);
801 0 : list_add_tail(&e->link,
802 0 : &e->file_priv->event_list);
803 0 : wake_up_interruptible_poll(&e->file_priv->event_wait,
804 : EPOLLIN | EPOLLRDNORM);
805 : }
806 :
807 : /**
808 : * drm_send_event_timestamp_locked - send DRM event to file descriptor
809 : * @dev: DRM device
810 : * @e: DRM event to deliver
811 : * @timestamp: timestamp to set for the fence event in kernel's CLOCK_MONOTONIC
812 : * time domain
813 : *
814 : * This function sends the event @e, initialized with drm_event_reserve_init(),
815 : * to its associated userspace DRM file. Callers must already hold
816 : * &drm_device.event_lock.
817 : *
818 : * Note that the core will take care of unlinking and disarming events when the
819 : * corresponding DRM file is closed. Drivers need not worry about whether the
820 : * DRM file for this event still exists and can call this function upon
821 : * completion of the asynchronous work unconditionally.
822 : */
823 0 : void drm_send_event_timestamp_locked(struct drm_device *dev,
824 : struct drm_pending_event *e, ktime_t timestamp)
825 : {
826 0 : drm_send_event_helper(dev, e, timestamp);
827 0 : }
828 : EXPORT_SYMBOL(drm_send_event_timestamp_locked);
829 :
830 : /**
831 : * drm_send_event_locked - send DRM event to file descriptor
832 : * @dev: DRM device
833 : * @e: DRM event to deliver
834 : *
835 : * This function sends the event @e, initialized with drm_event_reserve_init(),
836 : * to its associated userspace DRM file. Callers must already hold
837 : * &drm_device.event_lock, see drm_send_event() for the unlocked version.
838 : *
839 : * Note that the core will take care of unlinking and disarming events when the
840 : * corresponding DRM file is closed. Drivers need not worry about whether the
841 : * DRM file for this event still exists and can call this function upon
842 : * completion of the asynchronous work unconditionally.
843 : */
844 0 : void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e)
845 : {
846 0 : drm_send_event_helper(dev, e, 0);
847 0 : }
848 : EXPORT_SYMBOL(drm_send_event_locked);
849 :
850 : /**
851 : * drm_send_event - send DRM event to file descriptor
852 : * @dev: DRM device
853 : * @e: DRM event to deliver
854 : *
855 : * This function sends the event @e, initialized with drm_event_reserve_init(),
856 : * to its associated userspace DRM file. This function acquires
857 : * &drm_device.event_lock, see drm_send_event_locked() for callers which already
858 : * hold this lock.
859 : *
860 : * Note that the core will take care of unlinking and disarming events when the
861 : * corresponding DRM file is closed. Drivers need not worry about whether the
862 : * DRM file for this event still exists and can call this function upon
863 : * completion of the asynchronous work unconditionally.
864 : */
865 0 : void drm_send_event(struct drm_device *dev, struct drm_pending_event *e)
866 : {
867 : unsigned long irqflags;
868 :
869 0 : spin_lock_irqsave(&dev->event_lock, irqflags);
870 0 : drm_send_event_helper(dev, e, 0);
871 0 : spin_unlock_irqrestore(&dev->event_lock, irqflags);
872 0 : }
873 : EXPORT_SYMBOL(drm_send_event);
874 :
875 0 : static void print_size(struct drm_printer *p, const char *stat,
876 : const char *region, u64 sz)
877 : {
878 0 : const char *units[] = {"", " KiB", " MiB"};
879 : unsigned u;
880 :
881 0 : for (u = 0; u < ARRAY_SIZE(units) - 1; u++) {
882 0 : if (sz < SZ_1K)
883 : break;
884 0 : sz = div_u64(sz, SZ_1K);
885 : }
886 :
887 0 : drm_printf(p, "drm-%s-%s:\t%llu%s\n", stat, region, sz, units[u]);
888 0 : }
889 :
890 : /**
891 : * drm_print_memory_stats - A helper to print memory stats
892 : * @p: The printer to print output to
893 : * @stats: The collected memory stats
894 : * @supported_status: Bitmask of optional stats which are available
895 : * @region: The memory region
896 : *
897 : */
898 0 : void drm_print_memory_stats(struct drm_printer *p,
899 : const struct drm_memory_stats *stats,
900 : enum drm_gem_object_status supported_status,
901 : const char *region)
902 : {
903 0 : print_size(p, "total", region, stats->private + stats->shared);
904 0 : print_size(p, "shared", region, stats->shared);
905 0 : print_size(p, "active", region, stats->active);
906 :
907 0 : if (supported_status & DRM_GEM_OBJECT_RESIDENT)
908 0 : print_size(p, "resident", region, stats->resident);
909 :
910 0 : if (supported_status & DRM_GEM_OBJECT_PURGEABLE)
911 0 : print_size(p, "purgeable", region, stats->purgeable);
912 0 : }
913 : EXPORT_SYMBOL(drm_print_memory_stats);
914 :
915 : /**
916 : * drm_show_memory_stats - Helper to collect and show standard fdinfo memory stats
917 : * @p: the printer to print output to
918 : * @file: the DRM file
919 : *
920 : * Helper to iterate over GEM objects with a handle allocated in the specified
921 : * file.
922 : */
923 0 : void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file)
924 : {
925 : struct drm_gem_object *obj;
926 0 : struct drm_memory_stats status = {};
927 : enum drm_gem_object_status supported_status;
928 : int id;
929 :
930 0 : spin_lock(&file->table_lock);
931 0 : idr_for_each_entry (&file->object_idr, obj, id) {
932 0 : enum drm_gem_object_status s = 0;
933 :
934 0 : if (obj->funcs && obj->funcs->status) {
935 0 : s = obj->funcs->status(obj);
936 0 : supported_status = DRM_GEM_OBJECT_RESIDENT |
937 : DRM_GEM_OBJECT_PURGEABLE;
938 : }
939 :
940 0 : if (obj->handle_count > 1) {
941 0 : status.shared += obj->size;
942 : } else {
943 0 : status.private += obj->size;
944 : }
945 :
946 0 : if (s & DRM_GEM_OBJECT_RESIDENT) {
947 0 : status.resident += obj->size;
948 : } else {
949 : /* If already purged or not yet backed by pages, don't
950 : * count it as purgeable:
951 : */
952 0 : s &= ~DRM_GEM_OBJECT_PURGEABLE;
953 : }
954 :
955 0 : if (!dma_resv_test_signaled(obj->resv, dma_resv_usage_rw(true))) {
956 0 : status.active += obj->size;
957 :
958 : /* If still active, don't count as purgeable: */
959 0 : s &= ~DRM_GEM_OBJECT_PURGEABLE;
960 : }
961 :
962 0 : if (s & DRM_GEM_OBJECT_PURGEABLE)
963 0 : status.purgeable += obj->size;
964 : }
965 0 : spin_unlock(&file->table_lock);
966 :
967 0 : drm_print_memory_stats(p, &status, supported_status, "memory");
968 0 : }
969 : EXPORT_SYMBOL(drm_show_memory_stats);
970 :
971 : /**
972 : * drm_show_fdinfo - helper for drm file fops
973 : * @m: output stream
974 : * @f: the device file instance
975 : *
976 : * Helper to implement fdinfo, for userspace to query usage stats, etc, of a
977 : * process using the GPU. See also &drm_driver.show_fdinfo.
978 : *
979 : * For text output format description please see Documentation/gpu/drm-usage-stats.rst
980 : */
981 0 : void drm_show_fdinfo(struct seq_file *m, struct file *f)
982 : {
983 0 : struct drm_file *file = f->private_data;
984 0 : struct drm_device *dev = file->minor->dev;
985 0 : struct drm_printer p = drm_seq_file_printer(m);
986 :
987 0 : drm_printf(&p, "drm-driver:\t%s\n", dev->driver->name);
988 0 : drm_printf(&p, "drm-client-id:\t%llu\n", file->client_id);
989 :
990 0 : if (dev_is_pci(dev->dev)) {
991 0 : struct pci_dev *pdev = to_pci_dev(dev->dev);
992 :
993 0 : drm_printf(&p, "drm-pdev:\t%04x:%02x:%02x.%d\n",
994 0 : pci_domain_nr(pdev->bus), pdev->bus->number,
995 0 : PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
996 : }
997 :
998 0 : if (dev->driver->show_fdinfo)
999 0 : dev->driver->show_fdinfo(&p, file);
1000 0 : }
1001 : EXPORT_SYMBOL(drm_show_fdinfo);
1002 :
1003 : /**
1004 : * mock_drm_getfile - Create a new struct file for the drm device
1005 : * @minor: drm minor to wrap (e.g. #drm_device.primary)
1006 : * @flags: file creation mode (O_RDWR etc)
1007 : *
1008 : * This create a new struct file that wraps a DRM file context around a
1009 : * DRM minor. This mimicks userspace opening e.g. /dev/dri/card0, but without
1010 : * invoking userspace. The struct file may be operated on using its f_op
1011 : * (the drm_device.driver.fops) to mimick userspace operations, or be supplied
1012 : * to userspace facing functions as an internal/anonymous client.
1013 : *
1014 : * RETURNS:
1015 : * Pointer to newly created struct file, ERR_PTR on failure.
1016 : */
1017 0 : struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags)
1018 : {
1019 0 : struct drm_device *dev = minor->dev;
1020 : struct drm_file *priv;
1021 : struct file *file;
1022 :
1023 0 : priv = drm_file_alloc(minor);
1024 0 : if (IS_ERR(priv))
1025 : return ERR_CAST(priv);
1026 :
1027 0 : file = anon_inode_getfile("drm", dev->driver->fops, priv, flags);
1028 0 : if (IS_ERR(file)) {
1029 0 : drm_file_free(priv);
1030 0 : return file;
1031 : }
1032 :
1033 : /* Everyone shares a single global address space */
1034 0 : file->f_mapping = dev->anon_inode->i_mapping;
1035 :
1036 0 : drm_dev_get(dev);
1037 0 : priv->filp = file;
1038 :
1039 0 : return file;
1040 : }
1041 : EXPORT_SYMBOL_FOR_TESTS_ONLY(mock_drm_getfile);
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