Commit | Line | Data |
---|---|---|
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" |
81065548 | 43 | #include "drm_crtc_internal.h" |
1da177e4 | 44 | |
0d639883 | 45 | /* from BKL pushdown */ |
58374713 AB |
46 | DEFINE_MUTEX(drm_global_mutex); |
47 | ||
bcb877e4 DV |
48 | /** |
49 | * DOC: file operations | |
50 | * | |
51 | * Drivers must define the file operations structure that forms the DRM | |
52 | * userspace API entry point, even though most of those operations are | |
53 | * implemented in the DRM core. The mandatory functions are drm_open(), | |
54 | * drm_read(), drm_ioctl() and drm_compat_ioctl if CONFIG_COMPAT is enabled. | |
55 | * Drivers which implement private ioctls that require 32/64 bit compatibility | |
56 | * support must provided their onw .compat_ioctl() handler that processes | |
57 | * private ioctls and calls drm_compat_ioctl() for core ioctls. | |
58 | * | |
59 | * In addition drm_read() and drm_poll() provide support for DRM events. DRM | |
60 | * events are a generic and extensible means to send asynchronous events to | |
61 | * userspace through the file descriptor. They are used to send vblank event and | |
62 | * page flip completions by the KMS API. But drivers can also use it for their | |
63 | * own needs, e.g. to signal completion of rendering. | |
64 | * | |
65 | * The memory mapping implementation will vary depending on how the driver | |
66 | * manages memory. Legacy drivers will use the deprecated drm_legacy_mmap() | |
67 | * function, modern drivers should use one of the provided memory-manager | |
68 | * specific implementations. For GEM-based drivers this is drm_gem_mmap(). | |
69 | * | |
70 | * No other file operations are supported by the DRM userspace API. Overall the | |
da5335b8 | 71 | * following is an example #file_operations structure:: |
bcb877e4 DV |
72 | * |
73 | * static const example_drm_fops = { | |
74 | * .owner = THIS_MODULE, | |
75 | * .open = drm_open, | |
76 | * .release = drm_release, | |
77 | * .unlocked_ioctl = drm_ioctl, | |
78 | * #ifdef CONFIG_COMPAT | |
79 | * .compat_ioctl = drm_compat_ioctl, | |
80 | * #endif | |
81 | * .poll = drm_poll, | |
82 | * .read = drm_read, | |
83 | * .llseek = no_llseek, | |
84 | * .mmap = drm_gem_mmap, | |
85 | * }; | |
86 | */ | |
87 | ||
1dcc0ceb | 88 | static int drm_open_helper(struct file *filp, struct drm_minor *minor); |
c94f7029 | 89 | |
84b1fd10 | 90 | static int drm_setup(struct drm_device * dev) |
1da177e4 | 91 | { |
1da177e4 LT |
92 | int ret; |
93 | ||
7d14bb6b DV |
94 | if (dev->driver->firstopen && |
95 | !drm_core_check_feature(dev, DRIVER_MODESET)) { | |
22eae947 | 96 | ret = dev->driver->firstopen(dev); |
b5e89ed5 | 97 | if (ret != 0) |
1da177e4 LT |
98 | return ret; |
99 | } | |
100 | ||
f336ab76 DV |
101 | ret = drm_legacy_dma_setup(dev); |
102 | if (ret < 0) | |
103 | return ret; | |
1da177e4 | 104 | |
1da177e4 | 105 | |
b5e89ed5 | 106 | DRM_DEBUG("\n"); |
1da177e4 LT |
107 | return 0; |
108 | } | |
109 | ||
110 | /** | |
bcb877e4 DV |
111 | * drm_open - open method for DRM file |
112 | * @inode: device inode | |
113 | * @filp: file pointer. | |
b5e89ed5 | 114 | * |
bcb877e4 DV |
115 | * This function must be used by drivers as their .open() #file_operations |
116 | * method. It looks up the correct DRM device and instantiates all the per-file | |
117 | * resources for it. | |
118 | * | |
119 | * RETURNS: | |
1da177e4 | 120 | * |
bcb877e4 | 121 | * 0 on success or negative errno value on falure. |
1da177e4 | 122 | */ |
b5e89ed5 | 123 | int drm_open(struct inode *inode, struct file *filp) |
1da177e4 | 124 | { |
1616c525 | 125 | struct drm_device *dev; |
2c14f28b | 126 | struct drm_minor *minor; |
1616c525 | 127 | int retcode; |
fdb40a08 | 128 | int need_setup = 0; |
b5e89ed5 | 129 | |
1616c525 DH |
130 | minor = drm_minor_acquire(iminor(inode)); |
131 | if (IS_ERR(minor)) | |
132 | return PTR_ERR(minor); | |
2c07a21d | 133 | |
1616c525 | 134 | dev = minor->dev; |
fdb40a08 IH |
135 | if (!dev->open_count++) |
136 | need_setup = 1; | |
fdb40a08 | 137 | |
6796cb16 DH |
138 | /* share address_space across all char-devs of a single device */ |
139 | filp->f_mapping = dev->anon_inode->i_mapping; | |
fdb40a08 | 140 | |
1dcc0ceb | 141 | retcode = drm_open_helper(filp, minor); |
fdb40a08 IH |
142 | if (retcode) |
143 | goto err_undo; | |
fdb40a08 IH |
144 | if (need_setup) { |
145 | retcode = drm_setup(dev); | |
146 | if (retcode) | |
147 | goto err_undo; | |
f453ba04 | 148 | } |
fdb40a08 | 149 | return 0; |
a2c0a97b | 150 | |
fdb40a08 | 151 | err_undo: |
fdb40a08 | 152 | dev->open_count--; |
1616c525 | 153 | drm_minor_release(minor); |
1da177e4 LT |
154 | return retcode; |
155 | } | |
156 | EXPORT_SYMBOL(drm_open); | |
157 | ||
bcb877e4 | 158 | /* |
d985c108 DA |
159 | * Check whether DRI will run on this CPU. |
160 | * | |
161 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. | |
162 | */ | |
163 | static int drm_cpu_valid(void) | |
164 | { | |
d985c108 DA |
165 | #if defined(__sparc__) && !defined(__sparc_v9__) |
166 | return 0; /* No cmpxchg before v9 sparc. */ | |
167 | #endif | |
168 | return 1; | |
169 | } | |
170 | ||
bcb877e4 | 171 | /* |
d985c108 DA |
172 | * Called whenever a process opens /dev/drm. |
173 | * | |
d985c108 | 174 | * \param filp file pointer. |
f4aede2e | 175 | * \param minor acquired minor-object. |
d985c108 DA |
176 | * \return zero on success or a negative number on failure. |
177 | * | |
178 | * Creates and initializes a drm_file structure for the file private data in \p | |
179 | * filp and add it into the double linked list in \p dev. | |
180 | */ | |
1dcc0ceb | 181 | static int drm_open_helper(struct file *filp, struct drm_minor *minor) |
d985c108 | 182 | { |
f4aede2e | 183 | struct drm_device *dev = minor->dev; |
84b1fd10 | 184 | struct drm_file *priv; |
d985c108 DA |
185 | int ret; |
186 | ||
187 | if (filp->f_flags & O_EXCL) | |
188 | return -EBUSY; /* No exclusive opens */ | |
189 | if (!drm_cpu_valid()) | |
190 | return -EINVAL; | |
13bb9cc8 | 191 | if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF) |
5bcf719b | 192 | return -EINVAL; |
d985c108 | 193 | |
f4aede2e | 194 | DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index); |
d985c108 | 195 | |
6ebc22e6 | 196 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
d985c108 DA |
197 | if (!priv) |
198 | return -ENOMEM; | |
199 | ||
d985c108 | 200 | filp->private_data = priv; |
6c340eac | 201 | priv->filp = filp; |
2df68b43 | 202 | priv->uid = current_euid(); |
5fce5e0b | 203 | priv->pid = get_pid(task_pid(current)); |
f4aede2e | 204 | priv->minor = minor; |
df9b6a9c | 205 | |
d985c108 | 206 | /* for compatibility root is always authenticated */ |
3cb01a98 | 207 | priv->authenticated = capable(CAP_SYS_ADMIN); |
d985c108 DA |
208 | priv->lock_count = 0; |
209 | ||
bd1b331f | 210 | INIT_LIST_HEAD(&priv->lhead); |
f453ba04 | 211 | INIT_LIST_HEAD(&priv->fbs); |
4b096ac1 | 212 | mutex_init(&priv->fbs_lock); |
e2f5d2ea | 213 | INIT_LIST_HEAD(&priv->blobs); |
681047b4 | 214 | INIT_LIST_HEAD(&priv->pending_event_list); |
c9a9c5e0 KH |
215 | INIT_LIST_HEAD(&priv->event_list); |
216 | init_waitqueue_head(&priv->event_wait); | |
217 | priv->event_space = 4096; /* set aside 4k for event buffer */ | |
bd1b331f | 218 | |
9b2c0b7f CW |
219 | mutex_init(&priv->event_read_lock); |
220 | ||
1bcecfac | 221 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
673a394b EA |
222 | drm_gem_open(dev, priv); |
223 | ||
3248877e DA |
224 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
225 | drm_prime_init_file_private(&priv->prime); | |
226 | ||
d985c108 DA |
227 | if (dev->driver->open) { |
228 | ret = dev->driver->open(dev, priv); | |
229 | if (ret < 0) | |
df9b6a9c | 230 | goto out_prime_destroy; |
d985c108 DA |
231 | } |
232 | ||
2cbae7e6 DV |
233 | if (drm_is_primary_client(priv)) { |
234 | ret = drm_master_open(priv); | |
a0af2e53 | 235 | if (ret) |
df9b6a9c | 236 | goto out_close; |
7c1c2871 | 237 | } |
bd1b331f | 238 | |
1d2ac403 | 239 | mutex_lock(&dev->filelist_mutex); |
bd1b331f | 240 | list_add(&priv->lhead, &dev->filelist); |
1d2ac403 | 241 | mutex_unlock(&dev->filelist_mutex); |
d985c108 DA |
242 | |
243 | #ifdef __alpha__ | |
244 | /* | |
245 | * Default the hose | |
246 | */ | |
247 | if (!dev->hose) { | |
248 | struct pci_dev *pci_dev; | |
249 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
250 | if (pci_dev) { | |
251 | dev->hose = pci_dev->sysdata; | |
252 | pci_dev_put(pci_dev); | |
253 | } | |
254 | if (!dev->hose) { | |
59c1ad3b YW |
255 | struct pci_bus *b = list_entry(pci_root_buses.next, |
256 | struct pci_bus, node); | |
d985c108 DA |
257 | if (b) |
258 | dev->hose = b->sysdata; | |
259 | } | |
260 | } | |
261 | #endif | |
262 | ||
263 | return 0; | |
df9b6a9c SWK |
264 | |
265 | out_close: | |
266 | if (dev->driver->postclose) | |
267 | dev->driver->postclose(dev, priv); | |
268 | out_prime_destroy: | |
269 | if (drm_core_check_feature(dev, DRIVER_PRIME)) | |
270 | drm_prime_destroy_file_private(&priv->prime); | |
1bcecfac | 271 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
df9b6a9c | 272 | drm_gem_release(dev, priv); |
df9b6a9c | 273 | put_pid(priv->pid); |
9a298b2a | 274 | kfree(priv); |
d985c108 DA |
275 | filp->private_data = NULL; |
276 | return ret; | |
277 | } | |
278 | ||
c9a9c5e0 KH |
279 | static void drm_events_release(struct drm_file *file_priv) |
280 | { | |
281 | struct drm_device *dev = file_priv->minor->dev; | |
282 | struct drm_pending_event *e, *et; | |
c9a9c5e0 KH |
283 | unsigned long flags; |
284 | ||
285 | spin_lock_irqsave(&dev->event_lock, flags); | |
286 | ||
681047b4 DV |
287 | /* Unlink pending events */ |
288 | list_for_each_entry_safe(e, et, &file_priv->pending_event_list, | |
289 | pending_link) { | |
290 | list_del(&e->pending_link); | |
291 | e->file_priv = NULL; | |
292 | } | |
293 | ||
c9a9c5e0 | 294 | /* Remove unconsumed events */ |
1dda6805 YC |
295 | list_for_each_entry_safe(e, et, &file_priv->event_list, link) { |
296 | list_del(&e->link); | |
1b47aaf9 | 297 | kfree(e); |
1dda6805 | 298 | } |
c9a9c5e0 KH |
299 | |
300 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
301 | } | |
302 | ||
bcb877e4 | 303 | /* |
1c8887dd DH |
304 | * drm_legacy_dev_reinit |
305 | * | |
306 | * Reinitializes a legacy/ums drm device in it's lastclose function. | |
307 | */ | |
308 | static void drm_legacy_dev_reinit(struct drm_device *dev) | |
309 | { | |
68dfbeba DV |
310 | if (dev->irq_enabled) |
311 | drm_irq_uninstall(dev); | |
312 | ||
313 | mutex_lock(&dev->struct_mutex); | |
314 | ||
315 | drm_legacy_agp_clear(dev); | |
316 | ||
317 | drm_legacy_sg_cleanup(dev); | |
318 | drm_legacy_vma_flush(dev); | |
319 | drm_legacy_dma_takedown(dev); | |
320 | ||
321 | mutex_unlock(&dev->struct_mutex); | |
1c8887dd | 322 | |
1c8887dd DH |
323 | dev->sigdata.lock = NULL; |
324 | ||
325 | dev->context_flag = 0; | |
326 | dev->last_context = 0; | |
327 | dev->if_version = 0; | |
68dfbeba DV |
328 | |
329 | DRM_DEBUG("lastclose completed\n"); | |
1c8887dd DH |
330 | } |
331 | ||
bcb877e4 | 332 | /* |
1c8887dd DH |
333 | * Take down the DRM device. |
334 | * | |
335 | * \param dev DRM device structure. | |
336 | * | |
337 | * Frees every resource in \p dev. | |
338 | * | |
339 | * \sa drm_device | |
340 | */ | |
68dfbeba | 341 | void drm_lastclose(struct drm_device * dev) |
1c8887dd | 342 | { |
1c8887dd DH |
343 | DRM_DEBUG("\n"); |
344 | ||
345 | if (dev->driver->lastclose) | |
346 | dev->driver->lastclose(dev); | |
347 | DRM_DEBUG("driver lastclose completed\n"); | |
348 | ||
68dfbeba DV |
349 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
350 | drm_legacy_dev_reinit(dev); | |
1c8887dd DH |
351 | } |
352 | ||
1da177e4 | 353 | /** |
bcb877e4 DV |
354 | * drm_release - release method for DRM file |
355 | * @inode: device inode | |
356 | * @filp: file pointer. | |
1da177e4 | 357 | * |
bcb877e4 DV |
358 | * This function must be used by drivers as their .release() #file_operations |
359 | * method. It frees any resources associated with the open file, and if this is | |
360 | * the last open file for the DRM device also proceeds to call drm_lastclose(). | |
1da177e4 | 361 | * |
bcb877e4 DV |
362 | * RETURNS: |
363 | * | |
364 | * Always succeeds and returns 0. | |
1da177e4 | 365 | */ |
b5e89ed5 | 366 | int drm_release(struct inode *inode, struct file *filp) |
1da177e4 | 367 | { |
6c340eac | 368 | struct drm_file *file_priv = filp->private_data; |
1616c525 DH |
369 | struct drm_minor *minor = file_priv->minor; |
370 | struct drm_device *dev = minor->dev; | |
1da177e4 | 371 | |
58374713 | 372 | mutex_lock(&drm_global_mutex); |
1da177e4 | 373 | |
b5e89ed5 | 374 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
1da177e4 | 375 | |
1d2ac403 | 376 | mutex_lock(&dev->filelist_mutex); |
dff01de1 | 377 | list_del(&file_priv->lhead); |
1d2ac403 DV |
378 | mutex_unlock(&dev->filelist_mutex); |
379 | ||
22eae947 | 380 | if (dev->driver->preclose) |
6c340eac | 381 | dev->driver->preclose(dev, file_priv); |
1da177e4 LT |
382 | |
383 | /* ======================================================== | |
384 | * Begin inline drm_release | |
385 | */ | |
386 | ||
b5e89ed5 | 387 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
ba25f9dc | 388 | task_pid_nr(current), |
5817878c | 389 | (long)old_encode_dev(file_priv->minor->kdev->devt), |
b5e89ed5 DA |
390 | dev->open_count); |
391 | ||
1a75a222 DV |
392 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
393 | drm_legacy_lock_release(dev, filp); | |
1da177e4 | 394 | |
67cb4b4d | 395 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) |
a266162a | 396 | drm_legacy_reclaim_buffers(dev, file_priv); |
67cb4b4d | 397 | |
c9a9c5e0 KH |
398 | drm_events_release(file_priv); |
399 | ||
e2f5d2ea | 400 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
ea39f835 | 401 | drm_fb_release(file_priv); |
e2f5d2ea DS |
402 | drm_property_destroy_user_blobs(dev, file_priv); |
403 | } | |
ea39f835 | 404 | |
1bcecfac | 405 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
4e47e02d P |
406 | drm_gem_release(dev, file_priv); |
407 | ||
e7b96070 | 408 | drm_legacy_ctxbitmap_flush(dev, file_priv); |
1da177e4 | 409 | |
14d71ebd DV |
410 | if (drm_is_primary_client(file_priv)) |
411 | drm_master_release(file_priv); | |
c996fd0b | 412 | |
22eae947 | 413 | if (dev->driver->postclose) |
6c340eac | 414 | dev->driver->postclose(dev, file_priv); |
3248877e DA |
415 | |
416 | if (drm_core_check_feature(dev, DRIVER_PRIME)) | |
417 | drm_prime_destroy_file_private(&file_priv->prime); | |
418 | ||
ddde4371 VS |
419 | WARN_ON(!list_empty(&file_priv->event_list)); |
420 | ||
5fce5e0b | 421 | put_pid(file_priv->pid); |
9a298b2a | 422 | kfree(file_priv); |
1da177e4 LT |
423 | |
424 | /* ======================================================== | |
425 | * End inline drm_release | |
426 | */ | |
427 | ||
b5e89ed5 | 428 | if (!--dev->open_count) { |
68dfbeba | 429 | drm_lastclose(dev); |
2c07a21d DA |
430 | if (drm_device_is_unplugged(dev)) |
431 | drm_put_dev(dev); | |
1da177e4 | 432 | } |
58374713 | 433 | mutex_unlock(&drm_global_mutex); |
1da177e4 | 434 | |
1616c525 DH |
435 | drm_minor_release(minor); |
436 | ||
68dfbeba | 437 | return 0; |
1da177e4 LT |
438 | } |
439 | EXPORT_SYMBOL(drm_release); | |
440 | ||
bcb877e4 DV |
441 | /** |
442 | * drm_read - read method for DRM file | |
443 | * @filp: file pointer | |
444 | * @buffer: userspace destination pointer for the read | |
445 | * @count: count in bytes to read | |
446 | * @offset: offset to read | |
447 | * | |
448 | * This function must be used by drivers as their .read() #file_operations | |
449 | * method iff they use DRM events for asynchronous signalling to userspace. | |
450 | * Since events are used by the KMS API for vblank and page flip completion this | |
451 | * means all modern display drivers must use it. | |
452 | * | |
453 | * @offset is ignore, DRM events are read like a pipe. Therefore drivers also | |
454 | * must set the .llseek() #file_operation to no_llseek(). Polling support is | |
455 | * provided by drm_poll(). | |
456 | * | |
457 | * This function will only ever read a full event. Therefore userspace must | |
458 | * supply a big enough buffer to fit any event to ensure forward progress. Since | |
459 | * the maximum event space is currently 4K it's recommended to just use that for | |
460 | * safety. | |
461 | * | |
462 | * RETURNS: | |
463 | * | |
464 | * Number of bytes read (always aligned to full events, and can be 0) or a | |
465 | * negative error code on failure. | |
466 | */ | |
cdd1cf79 CW |
467 | ssize_t drm_read(struct file *filp, char __user *buffer, |
468 | size_t count, loff_t *offset) | |
c9a9c5e0 | 469 | { |
cdd1cf79 | 470 | struct drm_file *file_priv = filp->private_data; |
c9a9c5e0 | 471 | struct drm_device *dev = file_priv->minor->dev; |
9b2c0b7f | 472 | ssize_t ret; |
c9a9c5e0 | 473 | |
cdd1cf79 CW |
474 | if (!access_ok(VERIFY_WRITE, buffer, count)) |
475 | return -EFAULT; | |
c9a9c5e0 | 476 | |
9b2c0b7f CW |
477 | ret = mutex_lock_interruptible(&file_priv->event_read_lock); |
478 | if (ret) | |
479 | return ret; | |
480 | ||
cdd1cf79 | 481 | for (;;) { |
83eb64c8 CW |
482 | struct drm_pending_event *e = NULL; |
483 | ||
484 | spin_lock_irq(&dev->event_lock); | |
485 | if (!list_empty(&file_priv->event_list)) { | |
486 | e = list_first_entry(&file_priv->event_list, | |
487 | struct drm_pending_event, link); | |
488 | file_priv->event_space += e->event->length; | |
489 | list_del(&e->link); | |
490 | } | |
491 | spin_unlock_irq(&dev->event_lock); | |
492 | ||
493 | if (e == NULL) { | |
cdd1cf79 CW |
494 | if (ret) |
495 | break; | |
c9a9c5e0 | 496 | |
cdd1cf79 CW |
497 | if (filp->f_flags & O_NONBLOCK) { |
498 | ret = -EAGAIN; | |
499 | break; | |
500 | } | |
c9a9c5e0 | 501 | |
9b2c0b7f | 502 | mutex_unlock(&file_priv->event_read_lock); |
cdd1cf79 CW |
503 | ret = wait_event_interruptible(file_priv->event_wait, |
504 | !list_empty(&file_priv->event_list)); | |
9b2c0b7f CW |
505 | if (ret >= 0) |
506 | ret = mutex_lock_interruptible(&file_priv->event_read_lock); | |
507 | if (ret) | |
508 | return ret; | |
cdd1cf79 | 509 | } else { |
83eb64c8 CW |
510 | unsigned length = e->event->length; |
511 | ||
512 | if (length > count - ret) { | |
513 | put_back_event: | |
514 | spin_lock_irq(&dev->event_lock); | |
515 | file_priv->event_space -= length; | |
516 | list_add(&e->link, &file_priv->event_list); | |
517 | spin_unlock_irq(&dev->event_lock); | |
cdd1cf79 | 518 | break; |
83eb64c8 | 519 | } |
cdd1cf79 | 520 | |
83eb64c8 | 521 | if (copy_to_user(buffer + ret, e->event, length)) { |
cdd1cf79 CW |
522 | if (ret == 0) |
523 | ret = -EFAULT; | |
83eb64c8 | 524 | goto put_back_event; |
cdd1cf79 | 525 | } |
c9a9c5e0 | 526 | |
83eb64c8 | 527 | ret += length; |
1b47aaf9 | 528 | kfree(e); |
c9a9c5e0 | 529 | } |
c9a9c5e0 | 530 | } |
9b2c0b7f | 531 | mutex_unlock(&file_priv->event_read_lock); |
c9a9c5e0 | 532 | |
cdd1cf79 | 533 | return ret; |
c9a9c5e0 KH |
534 | } |
535 | EXPORT_SYMBOL(drm_read); | |
536 | ||
bcb877e4 DV |
537 | /** |
538 | * drm_poll - poll method for DRM file | |
539 | * @filp: file pointer | |
540 | * @wait: poll waiter table | |
541 | * | |
542 | * This function must be used by drivers as their .read() #file_operations | |
543 | * method iff they use DRM events for asynchronous signalling to userspace. | |
544 | * Since events are used by the KMS API for vblank and page flip completion this | |
545 | * means all modern display drivers must use it. | |
546 | * | |
547 | * See also drm_read(). | |
548 | * | |
549 | * RETURNS: | |
550 | * | |
551 | * Mask of POLL flags indicating the current status of the file. | |
552 | */ | |
1da177e4 LT |
553 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) |
554 | { | |
c9a9c5e0 KH |
555 | struct drm_file *file_priv = filp->private_data; |
556 | unsigned int mask = 0; | |
557 | ||
558 | poll_wait(filp, &file_priv->event_wait, wait); | |
559 | ||
560 | if (!list_empty(&file_priv->event_list)) | |
561 | mask |= POLLIN | POLLRDNORM; | |
562 | ||
563 | return mask; | |
1da177e4 | 564 | } |
b5e89ed5 | 565 | EXPORT_SYMBOL(drm_poll); |
2dd500f1 DV |
566 | |
567 | /** | |
4020b220 | 568 | * drm_event_reserve_init_locked - init a DRM event and reserve space for it |
2dd500f1 DV |
569 | * @dev: DRM device |
570 | * @file_priv: DRM file private data | |
571 | * @p: tracking structure for the pending event | |
572 | * @e: actual event data to deliver to userspace | |
573 | * | |
574 | * This function prepares the passed in event for eventual delivery. If the event | |
575 | * doesn't get delivered (because the IOCTL fails later on, before queuing up | |
576 | * anything) then the even must be cancelled and freed using | |
fb740cf2 DV |
577 | * drm_event_cancel_free(). Successfully initialized events should be sent out |
578 | * using drm_send_event() or drm_send_event_locked() to signal completion of the | |
579 | * asynchronous event to userspace. | |
2dd500f1 DV |
580 | * |
581 | * If callers embedded @p into a larger structure it must be allocated with | |
582 | * kmalloc and @p must be the first member element. | |
583 | * | |
4020b220 DV |
584 | * This is the locked version of drm_event_reserve_init() for callers which |
585 | * already hold dev->event_lock. | |
586 | * | |
2dd500f1 DV |
587 | * RETURNS: |
588 | * | |
589 | * 0 on success or a negative error code on failure. | |
590 | */ | |
4020b220 DV |
591 | int drm_event_reserve_init_locked(struct drm_device *dev, |
592 | struct drm_file *file_priv, | |
593 | struct drm_pending_event *p, | |
594 | struct drm_event *e) | |
2dd500f1 | 595 | { |
4020b220 DV |
596 | if (file_priv->event_space < e->length) |
597 | return -ENOMEM; | |
2dd500f1 DV |
598 | |
599 | file_priv->event_space -= e->length; | |
600 | ||
601 | p->event = e; | |
681047b4 | 602 | list_add(&p->pending_link, &file_priv->pending_event_list); |
2dd500f1 DV |
603 | p->file_priv = file_priv; |
604 | ||
4020b220 DV |
605 | return 0; |
606 | } | |
607 | EXPORT_SYMBOL(drm_event_reserve_init_locked); | |
608 | ||
609 | /** | |
610 | * drm_event_reserve_init - init a DRM event and reserve space for it | |
611 | * @dev: DRM device | |
612 | * @file_priv: DRM file private data | |
613 | * @p: tracking structure for the pending event | |
614 | * @e: actual event data to deliver to userspace | |
615 | * | |
616 | * This function prepares the passed in event for eventual delivery. If the event | |
617 | * doesn't get delivered (because the IOCTL fails later on, before queuing up | |
618 | * anything) then the even must be cancelled and freed using | |
619 | * drm_event_cancel_free(). Successfully initialized events should be sent out | |
620 | * using drm_send_event() or drm_send_event_locked() to signal completion of the | |
621 | * asynchronous event to userspace. | |
622 | * | |
623 | * If callers embedded @p into a larger structure it must be allocated with | |
624 | * kmalloc and @p must be the first member element. | |
625 | * | |
626 | * Callers which already hold dev->event_lock should use | |
627 | * drm_event_reserve_init() instead. | |
628 | * | |
629 | * RETURNS: | |
630 | * | |
631 | * 0 on success or a negative error code on failure. | |
632 | */ | |
633 | int drm_event_reserve_init(struct drm_device *dev, | |
634 | struct drm_file *file_priv, | |
635 | struct drm_pending_event *p, | |
636 | struct drm_event *e) | |
637 | { | |
638 | unsigned long flags; | |
639 | int ret; | |
640 | ||
641 | spin_lock_irqsave(&dev->event_lock, flags); | |
642 | ret = drm_event_reserve_init_locked(dev, file_priv, p, e); | |
2dd500f1 | 643 | spin_unlock_irqrestore(&dev->event_lock, flags); |
4020b220 | 644 | |
2dd500f1 DV |
645 | return ret; |
646 | } | |
647 | EXPORT_SYMBOL(drm_event_reserve_init); | |
648 | ||
649 | /** | |
650 | * drm_event_cancel_free - free a DRM event and release it's space | |
651 | * @dev: DRM device | |
652 | * @p: tracking structure for the pending event | |
653 | * | |
654 | * This function frees the event @p initialized with drm_event_reserve_init() | |
655 | * and releases any allocated space. | |
656 | */ | |
657 | void drm_event_cancel_free(struct drm_device *dev, | |
658 | struct drm_pending_event *p) | |
659 | { | |
660 | unsigned long flags; | |
661 | spin_lock_irqsave(&dev->event_lock, flags); | |
681047b4 DV |
662 | if (p->file_priv) { |
663 | p->file_priv->event_space += p->event->length; | |
664 | list_del(&p->pending_link); | |
665 | } | |
2dd500f1 | 666 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1b47aaf9 | 667 | kfree(p); |
2dd500f1 DV |
668 | } |
669 | EXPORT_SYMBOL(drm_event_cancel_free); | |
fb740cf2 DV |
670 | |
671 | /** | |
672 | * drm_send_event_locked - send DRM event to file descriptor | |
673 | * @dev: DRM device | |
674 | * @e: DRM event to deliver | |
675 | * | |
676 | * This function sends the event @e, initialized with drm_event_reserve_init(), | |
677 | * to its associated userspace DRM file. Callers must already hold | |
678 | * dev->event_lock, see drm_send_event() for the unlocked version. | |
681047b4 DV |
679 | * |
680 | * Note that the core will take care of unlinking and disarming events when the | |
681 | * corresponding DRM file is closed. Drivers need not worry about whether the | |
682 | * DRM file for this event still exists and can call this function upon | |
683 | * completion of the asynchronous work unconditionally. | |
fb740cf2 DV |
684 | */ |
685 | void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e) | |
686 | { | |
687 | assert_spin_locked(&dev->event_lock); | |
688 | ||
3b24f7d6 DV |
689 | if (e->completion) { |
690 | /* ->completion might disappear as soon as it signalled. */ | |
691 | complete_all(e->completion); | |
692 | e->completion = NULL; | |
693 | } | |
694 | ||
1b47aaf9 GP |
695 | if (e->fence) { |
696 | fence_signal(e->fence); | |
697 | fence_put(e->fence); | |
698 | } | |
699 | ||
681047b4 | 700 | if (!e->file_priv) { |
1b47aaf9 | 701 | kfree(e); |
681047b4 DV |
702 | return; |
703 | } | |
704 | ||
705 | list_del(&e->pending_link); | |
fb740cf2 DV |
706 | list_add_tail(&e->link, |
707 | &e->file_priv->event_list); | |
708 | wake_up_interruptible(&e->file_priv->event_wait); | |
709 | } | |
710 | EXPORT_SYMBOL(drm_send_event_locked); | |
711 | ||
712 | /** | |
713 | * drm_send_event - send DRM event to file descriptor | |
714 | * @dev: DRM device | |
715 | * @e: DRM event to deliver | |
716 | * | |
717 | * This function sends the event @e, initialized with drm_event_reserve_init(), | |
718 | * to its associated userspace DRM file. This function acquires dev->event_lock, | |
719 | * see drm_send_event_locked() for callers which already hold this lock. | |
681047b4 DV |
720 | * |
721 | * Note that the core will take care of unlinking and disarming events when the | |
722 | * corresponding DRM file is closed. Drivers need not worry about whether the | |
723 | * DRM file for this event still exists and can call this function upon | |
724 | * completion of the asynchronous work unconditionally. | |
fb740cf2 DV |
725 | */ |
726 | void drm_send_event(struct drm_device *dev, struct drm_pending_event *e) | |
727 | { | |
728 | unsigned long irqflags; | |
729 | ||
730 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
731 | drm_send_event_locked(dev, e); | |
732 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
733 | } | |
734 | EXPORT_SYMBOL(drm_send_event); |