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Commit | Line | Data |
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bcb877e4 | 1 | /* |
b5e89ed5 | 2 | * \file drm_fops.c |
1da177e4 | 3 | * File operations for DRM |
b5e89ed5 | 4 | * |
1da177e4 LT |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
6 | * \author Daryll Strauss <daryll@valinux.com> | |
7 | * \author Gareth Hughes <gareth@valinux.com> | |
8 | */ | |
9 | ||
10 | /* | |
11 | * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com | |
12 | * | |
13 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
14 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
15 | * All Rights Reserved. | |
16 | * | |
17 | * Permission is hereby granted, free of charge, to any person obtaining a | |
18 | * copy of this software and associated documentation files (the "Software"), | |
19 | * to deal in the Software without restriction, including without limitation | |
20 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
21 | * and/or sell copies of the Software, and to permit persons to whom the | |
22 | * Software is furnished to do so, subject to the following conditions: | |
23 | * | |
24 | * The above copyright notice and this permission notice (including the next | |
25 | * paragraph) shall be included in all copies or substantial portions of the | |
26 | * Software. | |
27 | * | |
28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
29 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
30 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
31 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
32 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
33 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
34 | * OTHER DEALINGS IN THE SOFTWARE. | |
35 | */ | |
36 | ||
760285e7 | 37 | #include <drm/drmP.h> |
1da177e4 | 38 | #include <linux/poll.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
e0cd3608 | 40 | #include <linux/module.h> |
e7b96070 | 41 | #include "drm_legacy.h" |
67d0ec4e | 42 | #include "drm_internal.h" |
1da177e4 | 43 | |
0d639883 | 44 | /* from BKL pushdown */ |
58374713 AB |
45 | DEFINE_MUTEX(drm_global_mutex); |
46 | ||
bcb877e4 DV |
47 | /** |
48 | * DOC: file operations | |
49 | * | |
50 | * Drivers must define the file operations structure that forms the DRM | |
51 | * userspace API entry point, even though most of those operations are | |
52 | * implemented in the DRM core. The mandatory functions are drm_open(), | |
53 | * drm_read(), drm_ioctl() and drm_compat_ioctl if CONFIG_COMPAT is enabled. | |
54 | * Drivers which implement private ioctls that require 32/64 bit compatibility | |
55 | * support must provided their onw .compat_ioctl() handler that processes | |
56 | * private ioctls and calls drm_compat_ioctl() for core ioctls. | |
57 | * | |
58 | * In addition drm_read() and drm_poll() provide support for DRM events. DRM | |
59 | * events are a generic and extensible means to send asynchronous events to | |
60 | * userspace through the file descriptor. They are used to send vblank event and | |
61 | * page flip completions by the KMS API. But drivers can also use it for their | |
62 | * own needs, e.g. to signal completion of rendering. | |
63 | * | |
64 | * The memory mapping implementation will vary depending on how the driver | |
65 | * manages memory. Legacy drivers will use the deprecated drm_legacy_mmap() | |
66 | * function, modern drivers should use one of the provided memory-manager | |
67 | * specific implementations. For GEM-based drivers this is drm_gem_mmap(). | |
68 | * | |
69 | * No other file operations are supported by the DRM userspace API. Overall the | |
70 | * following is an example #file_operations structure: | |
71 | * | |
72 | * static const example_drm_fops = { | |
73 | * .owner = THIS_MODULE, | |
74 | * .open = drm_open, | |
75 | * .release = drm_release, | |
76 | * .unlocked_ioctl = drm_ioctl, | |
77 | * #ifdef CONFIG_COMPAT | |
78 | * .compat_ioctl = drm_compat_ioctl, | |
79 | * #endif | |
80 | * .poll = drm_poll, | |
81 | * .read = drm_read, | |
82 | * .llseek = no_llseek, | |
83 | * .mmap = drm_gem_mmap, | |
84 | * }; | |
85 | */ | |
86 | ||
1dcc0ceb | 87 | static int drm_open_helper(struct file *filp, struct drm_minor *minor); |
c94f7029 | 88 | |
84b1fd10 | 89 | static int drm_setup(struct drm_device * dev) |
1da177e4 | 90 | { |
1da177e4 LT |
91 | int ret; |
92 | ||
7d14bb6b DV |
93 | if (dev->driver->firstopen && |
94 | !drm_core_check_feature(dev, DRIVER_MODESET)) { | |
22eae947 | 95 | ret = dev->driver->firstopen(dev); |
b5e89ed5 | 96 | if (ret != 0) |
1da177e4 LT |
97 | return ret; |
98 | } | |
99 | ||
f336ab76 DV |
100 | ret = drm_legacy_dma_setup(dev); |
101 | if (ret < 0) | |
102 | return ret; | |
1da177e4 | 103 | |
1da177e4 | 104 | |
b5e89ed5 | 105 | DRM_DEBUG("\n"); |
1da177e4 LT |
106 | return 0; |
107 | } | |
108 | ||
109 | /** | |
bcb877e4 DV |
110 | * drm_open - open method for DRM file |
111 | * @inode: device inode | |
112 | * @filp: file pointer. | |
b5e89ed5 | 113 | * |
bcb877e4 DV |
114 | * This function must be used by drivers as their .open() #file_operations |
115 | * method. It looks up the correct DRM device and instantiates all the per-file | |
116 | * resources for it. | |
117 | * | |
118 | * RETURNS: | |
1da177e4 | 119 | * |
bcb877e4 | 120 | * 0 on success or negative errno value on falure. |
1da177e4 | 121 | */ |
b5e89ed5 | 122 | int drm_open(struct inode *inode, struct file *filp) |
1da177e4 | 123 | { |
1616c525 | 124 | struct drm_device *dev; |
2c14f28b | 125 | struct drm_minor *minor; |
1616c525 | 126 | int retcode; |
fdb40a08 | 127 | int need_setup = 0; |
b5e89ed5 | 128 | |
1616c525 DH |
129 | minor = drm_minor_acquire(iminor(inode)); |
130 | if (IS_ERR(minor)) | |
131 | return PTR_ERR(minor); | |
2c07a21d | 132 | |
1616c525 | 133 | dev = minor->dev; |
fdb40a08 IH |
134 | if (!dev->open_count++) |
135 | need_setup = 1; | |
fdb40a08 | 136 | |
6796cb16 DH |
137 | /* share address_space across all char-devs of a single device */ |
138 | filp->f_mapping = dev->anon_inode->i_mapping; | |
fdb40a08 | 139 | |
1dcc0ceb | 140 | retcode = drm_open_helper(filp, minor); |
fdb40a08 IH |
141 | if (retcode) |
142 | goto err_undo; | |
fdb40a08 IH |
143 | if (need_setup) { |
144 | retcode = drm_setup(dev); | |
145 | if (retcode) | |
146 | goto err_undo; | |
f453ba04 | 147 | } |
fdb40a08 | 148 | return 0; |
a2c0a97b | 149 | |
fdb40a08 | 150 | err_undo: |
fdb40a08 | 151 | dev->open_count--; |
1616c525 | 152 | drm_minor_release(minor); |
1da177e4 LT |
153 | return retcode; |
154 | } | |
155 | EXPORT_SYMBOL(drm_open); | |
156 | ||
bcb877e4 | 157 | /* |
d985c108 DA |
158 | * Check whether DRI will run on this CPU. |
159 | * | |
160 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. | |
161 | */ | |
162 | static int drm_cpu_valid(void) | |
163 | { | |
d985c108 DA |
164 | #if defined(__sparc__) && !defined(__sparc_v9__) |
165 | return 0; /* No cmpxchg before v9 sparc. */ | |
166 | #endif | |
167 | return 1; | |
168 | } | |
169 | ||
bcb877e4 | 170 | /* |
a0af2e53 TH |
171 | * drm_new_set_master - Allocate a new master object and become master for the |
172 | * associated master realm. | |
173 | * | |
174 | * @dev: The associated device. | |
175 | * @fpriv: File private identifying the client. | |
176 | * | |
177 | * This function must be called with dev::struct_mutex held. | |
178 | * Returns negative error code on failure. Zero on success. | |
179 | */ | |
180 | int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv) | |
181 | { | |
182 | struct drm_master *old_master; | |
183 | int ret; | |
184 | ||
185 | lockdep_assert_held_once(&dev->master_mutex); | |
186 | ||
187 | /* create a new master */ | |
188 | fpriv->minor->master = drm_master_create(fpriv->minor); | |
189 | if (!fpriv->minor->master) | |
190 | return -ENOMEM; | |
191 | ||
192 | /* take another reference for the copy in the local file priv */ | |
193 | old_master = fpriv->master; | |
194 | fpriv->master = drm_master_get(fpriv->minor->master); | |
195 | ||
196 | if (dev->driver->master_create) { | |
197 | ret = dev->driver->master_create(dev, fpriv->master); | |
198 | if (ret) | |
199 | goto out_err; | |
200 | } | |
201 | if (dev->driver->master_set) { | |
202 | ret = dev->driver->master_set(dev, fpriv, true); | |
203 | if (ret) | |
204 | goto out_err; | |
205 | } | |
206 | ||
207 | fpriv->is_master = 1; | |
208 | fpriv->allowed_master = 1; | |
209 | fpriv->authenticated = 1; | |
210 | if (old_master) | |
211 | drm_master_put(&old_master); | |
212 | ||
213 | return 0; | |
214 | ||
215 | out_err: | |
216 | /* drop both references and restore old master on failure */ | |
217 | drm_master_put(&fpriv->minor->master); | |
218 | drm_master_put(&fpriv->master); | |
219 | fpriv->master = old_master; | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
bcb877e4 | 224 | /* |
d985c108 DA |
225 | * Called whenever a process opens /dev/drm. |
226 | * | |
d985c108 | 227 | * \param filp file pointer. |
f4aede2e | 228 | * \param minor acquired minor-object. |
d985c108 DA |
229 | * \return zero on success or a negative number on failure. |
230 | * | |
231 | * Creates and initializes a drm_file structure for the file private data in \p | |
232 | * filp and add it into the double linked list in \p dev. | |
233 | */ | |
1dcc0ceb | 234 | static int drm_open_helper(struct file *filp, struct drm_minor *minor) |
d985c108 | 235 | { |
f4aede2e | 236 | struct drm_device *dev = minor->dev; |
84b1fd10 | 237 | struct drm_file *priv; |
d985c108 DA |
238 | int ret; |
239 | ||
240 | if (filp->f_flags & O_EXCL) | |
241 | return -EBUSY; /* No exclusive opens */ | |
242 | if (!drm_cpu_valid()) | |
243 | return -EINVAL; | |
13bb9cc8 | 244 | if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF) |
5bcf719b | 245 | return -EINVAL; |
d985c108 | 246 | |
f4aede2e | 247 | DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index); |
d985c108 | 248 | |
6ebc22e6 | 249 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
d985c108 DA |
250 | if (!priv) |
251 | return -ENOMEM; | |
252 | ||
d985c108 | 253 | filp->private_data = priv; |
6c340eac | 254 | priv->filp = filp; |
2df68b43 | 255 | priv->uid = current_euid(); |
5fce5e0b | 256 | priv->pid = get_pid(task_pid(current)); |
f4aede2e | 257 | priv->minor = minor; |
df9b6a9c | 258 | |
d985c108 | 259 | /* for compatibility root is always authenticated */ |
3cb01a98 | 260 | priv->authenticated = capable(CAP_SYS_ADMIN); |
d985c108 DA |
261 | priv->lock_count = 0; |
262 | ||
bd1b331f | 263 | INIT_LIST_HEAD(&priv->lhead); |
f453ba04 | 264 | INIT_LIST_HEAD(&priv->fbs); |
4b096ac1 | 265 | mutex_init(&priv->fbs_lock); |
e2f5d2ea | 266 | INIT_LIST_HEAD(&priv->blobs); |
c9a9c5e0 KH |
267 | INIT_LIST_HEAD(&priv->event_list); |
268 | init_waitqueue_head(&priv->event_wait); | |
269 | priv->event_space = 4096; /* set aside 4k for event buffer */ | |
bd1b331f | 270 | |
9b2c0b7f CW |
271 | mutex_init(&priv->event_read_lock); |
272 | ||
1bcecfac | 273 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
673a394b EA |
274 | drm_gem_open(dev, priv); |
275 | ||
3248877e DA |
276 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
277 | drm_prime_init_file_private(&priv->prime); | |
278 | ||
d985c108 DA |
279 | if (dev->driver->open) { |
280 | ret = dev->driver->open(dev, priv); | |
281 | if (ret < 0) | |
df9b6a9c | 282 | goto out_prime_destroy; |
d985c108 DA |
283 | } |
284 | ||
1793126f DH |
285 | /* if there is no current master make this fd it, but do not create |
286 | * any master object for render clients */ | |
c996fd0b | 287 | mutex_lock(&dev->master_mutex); |
43683057 | 288 | if (drm_is_primary_client(priv) && !priv->minor->master) { |
7c1c2871 | 289 | /* create a new master */ |
a0af2e53 TH |
290 | ret = drm_new_set_master(dev, priv); |
291 | if (ret) | |
df9b6a9c | 292 | goto out_close; |
43683057 | 293 | } else if (drm_is_primary_client(priv)) { |
7c1c2871 DA |
294 | /* get a reference to the master */ |
295 | priv->master = drm_master_get(priv->minor->master); | |
7c1c2871 | 296 | } |
c996fd0b | 297 | mutex_unlock(&dev->master_mutex); |
bd1b331f | 298 | |
7c1c2871 | 299 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 300 | list_add(&priv->lhead, &dev->filelist); |
30e2fb18 | 301 | mutex_unlock(&dev->struct_mutex); |
d985c108 DA |
302 | |
303 | #ifdef __alpha__ | |
304 | /* | |
305 | * Default the hose | |
306 | */ | |
307 | if (!dev->hose) { | |
308 | struct pci_dev *pci_dev; | |
309 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
310 | if (pci_dev) { | |
311 | dev->hose = pci_dev->sysdata; | |
312 | pci_dev_put(pci_dev); | |
313 | } | |
314 | if (!dev->hose) { | |
59c1ad3b YW |
315 | struct pci_bus *b = list_entry(pci_root_buses.next, |
316 | struct pci_bus, node); | |
d985c108 DA |
317 | if (b) |
318 | dev->hose = b->sysdata; | |
319 | } | |
320 | } | |
321 | #endif | |
322 | ||
323 | return 0; | |
df9b6a9c SWK |
324 | |
325 | out_close: | |
c996fd0b | 326 | mutex_unlock(&dev->master_mutex); |
df9b6a9c SWK |
327 | if (dev->driver->postclose) |
328 | dev->driver->postclose(dev, priv); | |
329 | out_prime_destroy: | |
330 | if (drm_core_check_feature(dev, DRIVER_PRIME)) | |
331 | drm_prime_destroy_file_private(&priv->prime); | |
1bcecfac | 332 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
df9b6a9c | 333 | drm_gem_release(dev, priv); |
df9b6a9c | 334 | put_pid(priv->pid); |
9a298b2a | 335 | kfree(priv); |
d985c108 DA |
336 | filp->private_data = NULL; |
337 | return ret; | |
338 | } | |
339 | ||
7c1c2871 DA |
340 | static void drm_master_release(struct drm_device *dev, struct file *filp) |
341 | { | |
342 | struct drm_file *file_priv = filp->private_data; | |
343 | ||
bb6d822e | 344 | if (drm_legacy_i_have_hw_lock(dev, file_priv)) { |
7c1c2871 DA |
345 | DRM_DEBUG("File %p released, freeing lock for context %d\n", |
346 | filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); | |
bb6d822e DH |
347 | drm_legacy_lock_free(&file_priv->master->lock, |
348 | _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); | |
7c1c2871 | 349 | } |
7c1c2871 DA |
350 | } |
351 | ||
c9a9c5e0 KH |
352 | static void drm_events_release(struct drm_file *file_priv) |
353 | { | |
354 | struct drm_device *dev = file_priv->minor->dev; | |
355 | struct drm_pending_event *e, *et; | |
356 | struct drm_pending_vblank_event *v, *vt; | |
357 | unsigned long flags; | |
358 | ||
359 | spin_lock_irqsave(&dev->event_lock, flags); | |
360 | ||
361 | /* Remove pending flips */ | |
362 | list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link) | |
363 | if (v->base.file_priv == file_priv) { | |
364 | list_del(&v->base.link); | |
365 | drm_vblank_put(dev, v->pipe); | |
366 | v->base.destroy(&v->base); | |
367 | } | |
368 | ||
369 | /* Remove unconsumed events */ | |
1dda6805 YC |
370 | list_for_each_entry_safe(e, et, &file_priv->event_list, link) { |
371 | list_del(&e->link); | |
c9a9c5e0 | 372 | e->destroy(e); |
1dda6805 | 373 | } |
c9a9c5e0 KH |
374 | |
375 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
376 | } | |
377 | ||
bcb877e4 | 378 | /* |
1c8887dd DH |
379 | * drm_legacy_dev_reinit |
380 | * | |
381 | * Reinitializes a legacy/ums drm device in it's lastclose function. | |
382 | */ | |
383 | static void drm_legacy_dev_reinit(struct drm_device *dev) | |
384 | { | |
1c8887dd DH |
385 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
386 | return; | |
387 | ||
1c8887dd DH |
388 | dev->sigdata.lock = NULL; |
389 | ||
390 | dev->context_flag = 0; | |
391 | dev->last_context = 0; | |
392 | dev->if_version = 0; | |
393 | } | |
394 | ||
bcb877e4 | 395 | /* |
1c8887dd DH |
396 | * Take down the DRM device. |
397 | * | |
398 | * \param dev DRM device structure. | |
399 | * | |
400 | * Frees every resource in \p dev. | |
401 | * | |
402 | * \sa drm_device | |
403 | */ | |
404 | int drm_lastclose(struct drm_device * dev) | |
405 | { | |
1c8887dd DH |
406 | DRM_DEBUG("\n"); |
407 | ||
408 | if (dev->driver->lastclose) | |
409 | dev->driver->lastclose(dev); | |
410 | DRM_DEBUG("driver lastclose completed\n"); | |
411 | ||
412 | if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) | |
413 | drm_irq_uninstall(dev); | |
414 | ||
415 | mutex_lock(&dev->struct_mutex); | |
416 | ||
417 | drm_agp_clear(dev); | |
418 | ||
419 | drm_legacy_sg_cleanup(dev); | |
03decbe5 | 420 | drm_legacy_vma_flush(dev); |
1c8887dd DH |
421 | drm_legacy_dma_takedown(dev); |
422 | ||
1c8887dd DH |
423 | mutex_unlock(&dev->struct_mutex); |
424 | ||
425 | drm_legacy_dev_reinit(dev); | |
426 | ||
427 | DRM_DEBUG("lastclose completed\n"); | |
428 | return 0; | |
429 | } | |
430 | ||
1da177e4 | 431 | /** |
bcb877e4 DV |
432 | * drm_release - release method for DRM file |
433 | * @inode: device inode | |
434 | * @filp: file pointer. | |
1da177e4 | 435 | * |
bcb877e4 DV |
436 | * This function must be used by drivers as their .release() #file_operations |
437 | * method. It frees any resources associated with the open file, and if this is | |
438 | * the last open file for the DRM device also proceeds to call drm_lastclose(). | |
1da177e4 | 439 | * |
bcb877e4 DV |
440 | * RETURNS: |
441 | * | |
442 | * Always succeeds and returns 0. | |
1da177e4 | 443 | */ |
b5e89ed5 | 444 | int drm_release(struct inode *inode, struct file *filp) |
1da177e4 | 445 | { |
6c340eac | 446 | struct drm_file *file_priv = filp->private_data; |
1616c525 DH |
447 | struct drm_minor *minor = file_priv->minor; |
448 | struct drm_device *dev = minor->dev; | |
1da177e4 LT |
449 | int retcode = 0; |
450 | ||
58374713 | 451 | mutex_lock(&drm_global_mutex); |
1da177e4 | 452 | |
b5e89ed5 | 453 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
1da177e4 | 454 | |
dff01de1 CW |
455 | mutex_lock(&dev->struct_mutex); |
456 | list_del(&file_priv->lhead); | |
32e7b94a DH |
457 | if (file_priv->magic) |
458 | idr_remove(&file_priv->master->magic_map, file_priv->magic); | |
dff01de1 CW |
459 | mutex_unlock(&dev->struct_mutex); |
460 | ||
22eae947 | 461 | if (dev->driver->preclose) |
6c340eac | 462 | dev->driver->preclose(dev, file_priv); |
1da177e4 LT |
463 | |
464 | /* ======================================================== | |
465 | * Begin inline drm_release | |
466 | */ | |
467 | ||
b5e89ed5 | 468 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
ba25f9dc | 469 | task_pid_nr(current), |
5817878c | 470 | (long)old_encode_dev(file_priv->minor->kdev->devt), |
b5e89ed5 DA |
471 | dev->open_count); |
472 | ||
7c1c2871 DA |
473 | /* if the master has gone away we can't do anything with the lock */ |
474 | if (file_priv->minor->master) | |
475 | drm_master_release(dev, filp); | |
1da177e4 | 476 | |
67cb4b4d | 477 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) |
a266162a | 478 | drm_legacy_reclaim_buffers(dev, file_priv); |
67cb4b4d | 479 | |
c9a9c5e0 KH |
480 | drm_events_release(file_priv); |
481 | ||
e2f5d2ea | 482 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
ea39f835 | 483 | drm_fb_release(file_priv); |
e2f5d2ea DS |
484 | drm_property_destroy_user_blobs(dev, file_priv); |
485 | } | |
ea39f835 | 486 | |
1bcecfac | 487 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
4e47e02d P |
488 | drm_gem_release(dev, file_priv); |
489 | ||
e7b96070 | 490 | drm_legacy_ctxbitmap_flush(dev, file_priv); |
1da177e4 | 491 | |
c996fd0b | 492 | mutex_lock(&dev->master_mutex); |
7c1c2871 | 493 | |
7963e9db | 494 | if (file_priv->is_master) { |
fda714c2 | 495 | struct drm_master *master = file_priv->master; |
bd1b331f | 496 | |
bcb877e4 | 497 | /* |
fda714c2 TH |
498 | * Since the master is disappearing, so is the |
499 | * possibility to lock. | |
500 | */ | |
3cb01a98 | 501 | mutex_lock(&dev->struct_mutex); |
fda714c2 TH |
502 | if (master->lock.hw_lock) { |
503 | if (dev->sigdata.lock == master->lock.hw_lock) | |
504 | dev->sigdata.lock = NULL; | |
505 | master->lock.hw_lock = NULL; | |
506 | master->lock.file_priv = NULL; | |
507 | wake_up_interruptible_all(&master->lock.lock_queue); | |
508 | } | |
c996fd0b | 509 | mutex_unlock(&dev->struct_mutex); |
fda714c2 | 510 | |
7c1c2871 DA |
511 | if (file_priv->minor->master == file_priv->master) { |
512 | /* drop the reference held my the minor */ | |
862302ff TH |
513 | if (dev->driver->master_drop) |
514 | dev->driver->master_drop(dev, file_priv, true); | |
7c1c2871 DA |
515 | drm_master_put(&file_priv->minor->master); |
516 | } | |
1da177e4 | 517 | } |
7c1c2871 | 518 | |
c996fd0b | 519 | /* drop the master reference held by the file priv */ |
1793126f DH |
520 | if (file_priv->master) |
521 | drm_master_put(&file_priv->master); | |
7963e9db | 522 | file_priv->is_master = 0; |
c996fd0b TH |
523 | mutex_unlock(&dev->master_mutex); |
524 | ||
22eae947 | 525 | if (dev->driver->postclose) |
6c340eac | 526 | dev->driver->postclose(dev, file_priv); |
3248877e | 527 | |
319c933c | 528 | |
3248877e DA |
529 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
530 | drm_prime_destroy_file_private(&file_priv->prime); | |
531 | ||
ddde4371 VS |
532 | WARN_ON(!list_empty(&file_priv->event_list)); |
533 | ||
5fce5e0b | 534 | put_pid(file_priv->pid); |
9a298b2a | 535 | kfree(file_priv); |
1da177e4 LT |
536 | |
537 | /* ======================================================== | |
538 | * End inline drm_release | |
539 | */ | |
540 | ||
b5e89ed5 | 541 | if (!--dev->open_count) { |
43d1337c | 542 | retcode = drm_lastclose(dev); |
2c07a21d DA |
543 | if (drm_device_is_unplugged(dev)) |
544 | drm_put_dev(dev); | |
1da177e4 | 545 | } |
58374713 | 546 | mutex_unlock(&drm_global_mutex); |
1da177e4 | 547 | |
1616c525 DH |
548 | drm_minor_release(minor); |
549 | ||
1da177e4 LT |
550 | return retcode; |
551 | } | |
552 | EXPORT_SYMBOL(drm_release); | |
553 | ||
bcb877e4 DV |
554 | /** |
555 | * drm_read - read method for DRM file | |
556 | * @filp: file pointer | |
557 | * @buffer: userspace destination pointer for the read | |
558 | * @count: count in bytes to read | |
559 | * @offset: offset to read | |
560 | * | |
561 | * This function must be used by drivers as their .read() #file_operations | |
562 | * method iff they use DRM events for asynchronous signalling to userspace. | |
563 | * Since events are used by the KMS API for vblank and page flip completion this | |
564 | * means all modern display drivers must use it. | |
565 | * | |
566 | * @offset is ignore, DRM events are read like a pipe. Therefore drivers also | |
567 | * must set the .llseek() #file_operation to no_llseek(). Polling support is | |
568 | * provided by drm_poll(). | |
569 | * | |
570 | * This function will only ever read a full event. Therefore userspace must | |
571 | * supply a big enough buffer to fit any event to ensure forward progress. Since | |
572 | * the maximum event space is currently 4K it's recommended to just use that for | |
573 | * safety. | |
574 | * | |
575 | * RETURNS: | |
576 | * | |
577 | * Number of bytes read (always aligned to full events, and can be 0) or a | |
578 | * negative error code on failure. | |
579 | */ | |
cdd1cf79 CW |
580 | ssize_t drm_read(struct file *filp, char __user *buffer, |
581 | size_t count, loff_t *offset) | |
c9a9c5e0 | 582 | { |
cdd1cf79 | 583 | struct drm_file *file_priv = filp->private_data; |
c9a9c5e0 | 584 | struct drm_device *dev = file_priv->minor->dev; |
9b2c0b7f | 585 | ssize_t ret; |
c9a9c5e0 | 586 | |
cdd1cf79 CW |
587 | if (!access_ok(VERIFY_WRITE, buffer, count)) |
588 | return -EFAULT; | |
c9a9c5e0 | 589 | |
9b2c0b7f CW |
590 | ret = mutex_lock_interruptible(&file_priv->event_read_lock); |
591 | if (ret) | |
592 | return ret; | |
593 | ||
cdd1cf79 | 594 | for (;;) { |
83eb64c8 CW |
595 | struct drm_pending_event *e = NULL; |
596 | ||
597 | spin_lock_irq(&dev->event_lock); | |
598 | if (!list_empty(&file_priv->event_list)) { | |
599 | e = list_first_entry(&file_priv->event_list, | |
600 | struct drm_pending_event, link); | |
601 | file_priv->event_space += e->event->length; | |
602 | list_del(&e->link); | |
603 | } | |
604 | spin_unlock_irq(&dev->event_lock); | |
605 | ||
606 | if (e == NULL) { | |
cdd1cf79 CW |
607 | if (ret) |
608 | break; | |
c9a9c5e0 | 609 | |
cdd1cf79 CW |
610 | if (filp->f_flags & O_NONBLOCK) { |
611 | ret = -EAGAIN; | |
612 | break; | |
613 | } | |
c9a9c5e0 | 614 | |
9b2c0b7f | 615 | mutex_unlock(&file_priv->event_read_lock); |
cdd1cf79 CW |
616 | ret = wait_event_interruptible(file_priv->event_wait, |
617 | !list_empty(&file_priv->event_list)); | |
9b2c0b7f CW |
618 | if (ret >= 0) |
619 | ret = mutex_lock_interruptible(&file_priv->event_read_lock); | |
620 | if (ret) | |
621 | return ret; | |
cdd1cf79 | 622 | } else { |
83eb64c8 CW |
623 | unsigned length = e->event->length; |
624 | ||
625 | if (length > count - ret) { | |
626 | put_back_event: | |
627 | spin_lock_irq(&dev->event_lock); | |
628 | file_priv->event_space -= length; | |
629 | list_add(&e->link, &file_priv->event_list); | |
630 | spin_unlock_irq(&dev->event_lock); | |
cdd1cf79 | 631 | break; |
83eb64c8 | 632 | } |
cdd1cf79 | 633 | |
83eb64c8 | 634 | if (copy_to_user(buffer + ret, e->event, length)) { |
cdd1cf79 CW |
635 | if (ret == 0) |
636 | ret = -EFAULT; | |
83eb64c8 | 637 | goto put_back_event; |
cdd1cf79 | 638 | } |
c9a9c5e0 | 639 | |
83eb64c8 | 640 | ret += length; |
a0a0bde3 | 641 | e->destroy(e); |
c9a9c5e0 | 642 | } |
c9a9c5e0 | 643 | } |
9b2c0b7f | 644 | mutex_unlock(&file_priv->event_read_lock); |
c9a9c5e0 | 645 | |
cdd1cf79 | 646 | return ret; |
c9a9c5e0 KH |
647 | } |
648 | EXPORT_SYMBOL(drm_read); | |
649 | ||
bcb877e4 DV |
650 | /** |
651 | * drm_poll - poll method for DRM file | |
652 | * @filp: file pointer | |
653 | * @wait: poll waiter table | |
654 | * | |
655 | * This function must be used by drivers as their .read() #file_operations | |
656 | * method iff they use DRM events for asynchronous signalling to userspace. | |
657 | * Since events are used by the KMS API for vblank and page flip completion this | |
658 | * means all modern display drivers must use it. | |
659 | * | |
660 | * See also drm_read(). | |
661 | * | |
662 | * RETURNS: | |
663 | * | |
664 | * Mask of POLL flags indicating the current status of the file. | |
665 | */ | |
1da177e4 LT |
666 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) |
667 | { | |
c9a9c5e0 KH |
668 | struct drm_file *file_priv = filp->private_data; |
669 | unsigned int mask = 0; | |
670 | ||
671 | poll_wait(filp, &file_priv->event_wait, wait); | |
672 | ||
673 | if (!list_empty(&file_priv->event_list)) | |
674 | mask |= POLLIN | POLLRDNORM; | |
675 | ||
676 | return mask; | |
1da177e4 | 677 | } |
b5e89ed5 | 678 | EXPORT_SYMBOL(drm_poll); |
2dd500f1 DV |
679 | |
680 | /** | |
681 | * drm_event_reserve_init - init a DRM event and reserve space for it | |
682 | * @dev: DRM device | |
683 | * @file_priv: DRM file private data | |
684 | * @p: tracking structure for the pending event | |
685 | * @e: actual event data to deliver to userspace | |
686 | * | |
687 | * This function prepares the passed in event for eventual delivery. If the event | |
688 | * doesn't get delivered (because the IOCTL fails later on, before queuing up | |
689 | * anything) then the even must be cancelled and freed using | |
fb740cf2 DV |
690 | * drm_event_cancel_free(). Successfully initialized events should be sent out |
691 | * using drm_send_event() or drm_send_event_locked() to signal completion of the | |
692 | * asynchronous event to userspace. | |
2dd500f1 DV |
693 | * |
694 | * If callers embedded @p into a larger structure it must be allocated with | |
695 | * kmalloc and @p must be the first member element. | |
696 | * | |
697 | * RETURNS: | |
698 | * | |
699 | * 0 on success or a negative error code on failure. | |
700 | */ | |
701 | int drm_event_reserve_init(struct drm_device *dev, | |
702 | struct drm_file *file_priv, | |
703 | struct drm_pending_event *p, | |
704 | struct drm_event *e) | |
705 | { | |
706 | unsigned long flags; | |
707 | int ret = 0; | |
708 | ||
709 | spin_lock_irqsave(&dev->event_lock, flags); | |
710 | ||
711 | if (file_priv->event_space < e->length) { | |
712 | ret = -ENOMEM; | |
713 | goto out; | |
714 | } | |
715 | ||
716 | file_priv->event_space -= e->length; | |
717 | ||
718 | p->event = e; | |
719 | p->file_priv = file_priv; | |
720 | ||
721 | /* we *could* pass this in as arg, but everyone uses kfree: */ | |
722 | p->destroy = (void (*) (struct drm_pending_event *)) kfree; | |
723 | ||
724 | out: | |
725 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
726 | return ret; | |
727 | } | |
728 | EXPORT_SYMBOL(drm_event_reserve_init); | |
729 | ||
730 | /** | |
731 | * drm_event_cancel_free - free a DRM event and release it's space | |
732 | * @dev: DRM device | |
733 | * @p: tracking structure for the pending event | |
734 | * | |
735 | * This function frees the event @p initialized with drm_event_reserve_init() | |
736 | * and releases any allocated space. | |
737 | */ | |
738 | void drm_event_cancel_free(struct drm_device *dev, | |
739 | struct drm_pending_event *p) | |
740 | { | |
741 | unsigned long flags; | |
742 | spin_lock_irqsave(&dev->event_lock, flags); | |
743 | p->file_priv->event_space += p->event->length; | |
744 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
745 | p->destroy(p); | |
746 | } | |
747 | EXPORT_SYMBOL(drm_event_cancel_free); | |
fb740cf2 DV |
748 | |
749 | /** | |
750 | * drm_send_event_locked - send DRM event to file descriptor | |
751 | * @dev: DRM device | |
752 | * @e: DRM event to deliver | |
753 | * | |
754 | * This function sends the event @e, initialized with drm_event_reserve_init(), | |
755 | * to its associated userspace DRM file. Callers must already hold | |
756 | * dev->event_lock, see drm_send_event() for the unlocked version. | |
757 | */ | |
758 | void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e) | |
759 | { | |
760 | assert_spin_locked(&dev->event_lock); | |
761 | ||
762 | list_add_tail(&e->link, | |
763 | &e->file_priv->event_list); | |
764 | wake_up_interruptible(&e->file_priv->event_wait); | |
765 | } | |
766 | EXPORT_SYMBOL(drm_send_event_locked); | |
767 | ||
768 | /** | |
769 | * drm_send_event - send DRM event to file descriptor | |
770 | * @dev: DRM device | |
771 | * @e: DRM event to deliver | |
772 | * | |
773 | * This function sends the event @e, initialized with drm_event_reserve_init(), | |
774 | * to its associated userspace DRM file. This function acquires dev->event_lock, | |
775 | * see drm_send_event_locked() for callers which already hold this lock. | |
776 | */ | |
777 | void drm_send_event(struct drm_device *dev, struct drm_pending_event *e) | |
778 | { | |
779 | unsigned long irqflags; | |
780 | ||
781 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
782 | drm_send_event_locked(dev, e); | |
783 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
784 | } | |
785 | EXPORT_SYMBOL(drm_send_event); |