Commit | Line | Data |
---|---|---|
1da177e4 | 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 | ||
37 | #include "drmP.h" | |
38 | #include <linux/poll.h> | |
39 | ||
b5e89ed5 DA |
40 | static int drm_open_helper(struct inode *inode, struct file *filp, |
41 | drm_device_t * dev); | |
c94f7029 | 42 | |
b5e89ed5 | 43 | static int drm_setup(drm_device_t * dev) |
1da177e4 LT |
44 | { |
45 | int i; | |
46 | int ret; | |
47 | ||
b5e89ed5 DA |
48 | if (dev->driver->presetup) { |
49 | ret = dev->driver->presetup(dev); | |
50 | if (ret != 0) | |
1da177e4 LT |
51 | return ret; |
52 | } | |
53 | ||
b5e89ed5 DA |
54 | atomic_set(&dev->ioctl_count, 0); |
55 | atomic_set(&dev->vma_count, 0); | |
1da177e4 | 56 | dev->buf_use = 0; |
b5e89ed5 | 57 | atomic_set(&dev->buf_alloc, 0); |
1da177e4 | 58 | |
b5e89ed5 DA |
59 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) { |
60 | i = drm_dma_setup(dev); | |
61 | if (i < 0) | |
1da177e4 LT |
62 | return i; |
63 | } | |
64 | ||
b5e89ed5 DA |
65 | for (i = 0; i < DRM_ARRAY_SIZE(dev->counts); i++) |
66 | atomic_set(&dev->counts[i], 0); | |
1da177e4 | 67 | |
b5e89ed5 | 68 | for (i = 0; i < DRM_HASH_SIZE; i++) { |
1da177e4 LT |
69 | dev->magiclist[i].head = NULL; |
70 | dev->magiclist[i].tail = NULL; | |
71 | } | |
72 | ||
b5e89ed5 DA |
73 | dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST); |
74 | if (dev->ctxlist == NULL) | |
75 | return -ENOMEM; | |
1da177e4 LT |
76 | memset(dev->ctxlist, 0, sizeof(*dev->ctxlist)); |
77 | INIT_LIST_HEAD(&dev->ctxlist->head); | |
78 | ||
79 | dev->vmalist = NULL; | |
80 | dev->sigdata.lock = dev->lock.hw_lock = NULL; | |
b5e89ed5 | 81 | init_waitqueue_head(&dev->lock.lock_queue); |
1da177e4 LT |
82 | dev->queue_count = 0; |
83 | dev->queue_reserved = 0; | |
84 | dev->queue_slots = 0; | |
85 | dev->queuelist = NULL; | |
86 | dev->irq_enabled = 0; | |
87 | dev->context_flag = 0; | |
88 | dev->interrupt_flag = 0; | |
89 | dev->dma_flag = 0; | |
90 | dev->last_context = 0; | |
91 | dev->last_switch = 0; | |
92 | dev->last_checked = 0; | |
b5e89ed5 | 93 | init_waitqueue_head(&dev->context_wait); |
1da177e4 LT |
94 | dev->if_version = 0; |
95 | ||
96 | dev->ctx_start = 0; | |
97 | dev->lck_start = 0; | |
98 | ||
99 | dev->buf_rp = dev->buf; | |
100 | dev->buf_wp = dev->buf; | |
101 | dev->buf_end = dev->buf + DRM_BSZ; | |
102 | dev->buf_async = NULL; | |
b5e89ed5 DA |
103 | init_waitqueue_head(&dev->buf_readers); |
104 | init_waitqueue_head(&dev->buf_writers); | |
1da177e4 | 105 | |
b5e89ed5 | 106 | DRM_DEBUG("\n"); |
1da177e4 LT |
107 | |
108 | /* | |
109 | * The kernel's context could be created here, but is now created | |
b5e89ed5 | 110 | * in drm_dma_enqueue. This is more resource-efficient for |
1da177e4 LT |
111 | * hardware that does not do DMA, but may mean that |
112 | * drm_select_queue fails between the time the interrupt is | |
113 | * initialized and the time the queues are initialized. | |
114 | */ | |
115 | if (dev->driver->postsetup) | |
116 | dev->driver->postsetup(dev); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | /** | |
122 | * Open file. | |
b5e89ed5 | 123 | * |
1da177e4 LT |
124 | * \param inode device inode |
125 | * \param filp file pointer. | |
126 | * \return zero on success or a negative number on failure. | |
127 | * | |
128 | * Searches the DRM device with the same minor number, calls open_helper(), and | |
129 | * increments the device open count. If the open count was previous at zero, | |
130 | * i.e., it's the first that the device is open, then calls setup(). | |
131 | */ | |
b5e89ed5 | 132 | int drm_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
133 | { |
134 | drm_device_t *dev = NULL; | |
135 | int minor = iminor(inode); | |
136 | int retcode = 0; | |
137 | ||
138 | if (!((minor >= 0) && (minor < drm_cards_limit))) | |
139 | return -ENODEV; | |
b5e89ed5 | 140 | |
1da177e4 LT |
141 | if (!drm_heads[minor]) |
142 | return -ENODEV; | |
143 | ||
144 | if (!(dev = drm_heads[minor]->dev)) | |
145 | return -ENODEV; | |
b5e89ed5 DA |
146 | |
147 | retcode = drm_open_helper(inode, filp, dev); | |
148 | if (!retcode) { | |
149 | atomic_inc(&dev->counts[_DRM_STAT_OPENS]); | |
150 | spin_lock(&dev->count_lock); | |
151 | if (!dev->open_count++) { | |
152 | spin_unlock(&dev->count_lock); | |
153 | return drm_setup(dev); | |
1da177e4 | 154 | } |
b5e89ed5 | 155 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
156 | } |
157 | ||
158 | return retcode; | |
159 | } | |
b5e89ed5 | 160 | |
1da177e4 LT |
161 | EXPORT_SYMBOL(drm_open); |
162 | ||
163 | /** | |
164 | * Release file. | |
165 | * | |
166 | * \param inode device inode | |
167 | * \param filp file pointer. | |
168 | * \return zero on success or a negative number on failure. | |
169 | * | |
170 | * If the hardware lock is held then free it, and take it again for the kernel | |
171 | * context since it's necessary to reclaim buffers. Unlink the file private | |
172 | * data from its list and free it. Decreases the open count and if it reaches | |
173 | * zero calls takedown(). | |
174 | */ | |
b5e89ed5 | 175 | int drm_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
176 | { |
177 | drm_file_t *priv = filp->private_data; | |
178 | drm_device_t *dev; | |
179 | int retcode = 0; | |
180 | ||
181 | lock_kernel(); | |
182 | dev = priv->head->dev; | |
183 | ||
b5e89ed5 | 184 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
1da177e4 LT |
185 | |
186 | if (dev->driver->prerelease) | |
187 | dev->driver->prerelease(dev, filp); | |
188 | ||
189 | /* ======================================================== | |
190 | * Begin inline drm_release | |
191 | */ | |
192 | ||
b5e89ed5 DA |
193 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
194 | current->pid, (long)old_encode_dev(priv->head->device), | |
195 | dev->open_count); | |
196 | ||
197 | if (priv->lock_count && dev->lock.hw_lock && | |
198 | _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) && | |
199 | dev->lock.filp == filp) { | |
200 | DRM_DEBUG("File %p released, freeing lock for context %d\n", | |
201 | filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
1da177e4 | 202 | |
1da177e4 LT |
203 | if (dev->driver->release) |
204 | dev->driver->release(dev, filp); | |
205 | ||
b5e89ed5 DA |
206 | drm_lock_free(dev, &dev->lock.hw_lock->lock, |
207 | _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
1da177e4 | 208 | |
b5e89ed5 DA |
209 | /* FIXME: may require heavy-handed reset of |
210 | hardware at this point, possibly | |
211 | processed via a callback to the X | |
212 | server. */ | |
213 | } else if (dev->driver->release && priv->lock_count | |
214 | && dev->lock.hw_lock) { | |
1da177e4 | 215 | /* The lock is required to reclaim buffers */ |
b5e89ed5 | 216 | DECLARE_WAITQUEUE(entry, current); |
1da177e4 | 217 | |
b5e89ed5 | 218 | add_wait_queue(&dev->lock.lock_queue, &entry); |
1da177e4 LT |
219 | for (;;) { |
220 | __set_current_state(TASK_INTERRUPTIBLE); | |
b5e89ed5 | 221 | if (!dev->lock.hw_lock) { |
1da177e4 LT |
222 | /* Device has been unregistered */ |
223 | retcode = -EINTR; | |
224 | break; | |
225 | } | |
b5e89ed5 DA |
226 | if (drm_lock_take(&dev->lock.hw_lock->lock, |
227 | DRM_KERNEL_CONTEXT)) { | |
228 | dev->lock.filp = filp; | |
1da177e4 | 229 | dev->lock.lock_time = jiffies; |
b5e89ed5 | 230 | atomic_inc(&dev->counts[_DRM_STAT_LOCKS]); |
1da177e4 LT |
231 | break; /* Got lock */ |
232 | } | |
b5e89ed5 | 233 | /* Contention */ |
1da177e4 | 234 | schedule(); |
b5e89ed5 | 235 | if (signal_pending(current)) { |
1da177e4 LT |
236 | retcode = -ERESTARTSYS; |
237 | break; | |
238 | } | |
239 | } | |
240 | __set_current_state(TASK_RUNNING); | |
b5e89ed5 DA |
241 | remove_wait_queue(&dev->lock.lock_queue, &entry); |
242 | if (!retcode) { | |
1da177e4 LT |
243 | if (dev->driver->release) |
244 | dev->driver->release(dev, filp); | |
b5e89ed5 DA |
245 | drm_lock_free(dev, &dev->lock.hw_lock->lock, |
246 | DRM_KERNEL_CONTEXT); | |
1da177e4 LT |
247 | } |
248 | } | |
b5e89ed5 DA |
249 | |
250 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) | |
251 | && !dev->driver->release) { | |
1da177e4 LT |
252 | dev->driver->reclaim_buffers(dev, filp); |
253 | } | |
254 | ||
b5e89ed5 | 255 | drm_fasync(-1, filp, 0); |
1da177e4 | 256 | |
b5e89ed5 DA |
257 | down(&dev->ctxlist_sem); |
258 | if (dev->ctxlist && (!list_empty(&dev->ctxlist->head))) { | |
1da177e4 LT |
259 | drm_ctx_list_t *pos, *n; |
260 | ||
b5e89ed5 DA |
261 | list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) { |
262 | if (pos->tag == priv && | |
263 | pos->handle != DRM_KERNEL_CONTEXT) { | |
1da177e4 | 264 | if (dev->driver->context_dtor) |
b5e89ed5 DA |
265 | dev->driver->context_dtor(dev, |
266 | pos->handle); | |
1da177e4 | 267 | |
b5e89ed5 | 268 | drm_ctxbitmap_free(dev, pos->handle); |
1da177e4 | 269 | |
b5e89ed5 DA |
270 | list_del(&pos->head); |
271 | drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); | |
1da177e4 LT |
272 | --dev->ctx_count; |
273 | } | |
274 | } | |
275 | } | |
b5e89ed5 | 276 | up(&dev->ctxlist_sem); |
1da177e4 | 277 | |
b5e89ed5 DA |
278 | down(&dev->struct_sem); |
279 | if (priv->remove_auth_on_close == 1) { | |
1da177e4 | 280 | drm_file_t *temp = dev->file_first; |
b5e89ed5 | 281 | while (temp) { |
1da177e4 LT |
282 | temp->authenticated = 0; |
283 | temp = temp->next; | |
284 | } | |
285 | } | |
b5e89ed5 | 286 | if (priv->prev) { |
1da177e4 LT |
287 | priv->prev->next = priv->next; |
288 | } else { | |
b5e89ed5 | 289 | dev->file_first = priv->next; |
1da177e4 | 290 | } |
b5e89ed5 | 291 | if (priv->next) { |
1da177e4 LT |
292 | priv->next->prev = priv->prev; |
293 | } else { | |
b5e89ed5 | 294 | dev->file_last = priv->prev; |
1da177e4 | 295 | } |
b5e89ed5 DA |
296 | up(&dev->struct_sem); |
297 | ||
1da177e4 LT |
298 | if (dev->driver->free_filp_priv) |
299 | dev->driver->free_filp_priv(dev, priv); | |
300 | ||
b5e89ed5 | 301 | drm_free(priv, sizeof(*priv), DRM_MEM_FILES); |
1da177e4 LT |
302 | |
303 | /* ======================================================== | |
304 | * End inline drm_release | |
305 | */ | |
306 | ||
b5e89ed5 DA |
307 | atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); |
308 | spin_lock(&dev->count_lock); | |
309 | if (!--dev->open_count) { | |
310 | if (atomic_read(&dev->ioctl_count) || dev->blocked) { | |
311 | DRM_ERROR("Device busy: %d %d\n", | |
312 | atomic_read(&dev->ioctl_count), dev->blocked); | |
313 | spin_unlock(&dev->count_lock); | |
1da177e4 LT |
314 | unlock_kernel(); |
315 | return -EBUSY; | |
316 | } | |
b5e89ed5 | 317 | spin_unlock(&dev->count_lock); |
1da177e4 | 318 | unlock_kernel(); |
b5e89ed5 | 319 | return drm_takedown(dev); |
1da177e4 | 320 | } |
b5e89ed5 | 321 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
322 | |
323 | unlock_kernel(); | |
324 | ||
325 | return retcode; | |
326 | } | |
b5e89ed5 | 327 | |
1da177e4 LT |
328 | EXPORT_SYMBOL(drm_release); |
329 | ||
330 | /** | |
b5e89ed5 | 331 | * Called whenever a process opens /dev/drm. |
1da177e4 LT |
332 | * |
333 | * \param inode device inode. | |
334 | * \param filp file pointer. | |
335 | * \param dev device. | |
336 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 337 | * |
1da177e4 LT |
338 | * Creates and initializes a drm_file structure for the file private data in \p |
339 | * filp and add it into the double linked list in \p dev. | |
340 | */ | |
b5e89ed5 DA |
341 | static int drm_open_helper(struct inode *inode, struct file *filp, |
342 | drm_device_t * dev) | |
1da177e4 | 343 | { |
b5e89ed5 DA |
344 | int minor = iminor(inode); |
345 | drm_file_t *priv; | |
1da177e4 LT |
346 | int ret; |
347 | ||
b5e89ed5 DA |
348 | if (filp->f_flags & O_EXCL) |
349 | return -EBUSY; /* No exclusive opens */ | |
350 | if (!drm_cpu_valid()) | |
351 | return -EINVAL; | |
1da177e4 LT |
352 | |
353 | DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor); | |
354 | ||
b5e89ed5 DA |
355 | priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); |
356 | if (!priv) | |
357 | return -ENOMEM; | |
1da177e4 LT |
358 | |
359 | memset(priv, 0, sizeof(*priv)); | |
b5e89ed5 DA |
360 | filp->private_data = priv; |
361 | priv->uid = current->euid; | |
362 | priv->pid = current->pid; | |
363 | priv->minor = minor; | |
364 | priv->head = drm_heads[minor]; | |
365 | priv->ioctl_count = 0; | |
1da177e4 | 366 | priv->authenticated = capable(CAP_SYS_ADMIN); |
b5e89ed5 | 367 | priv->lock_count = 0; |
1da177e4 LT |
368 | |
369 | if (dev->driver->open_helper) { | |
b5e89ed5 | 370 | ret = dev->driver->open_helper(dev, priv); |
1da177e4 LT |
371 | if (ret < 0) |
372 | goto out_free; | |
373 | } | |
374 | ||
375 | down(&dev->struct_sem); | |
376 | if (!dev->file_last) { | |
b5e89ed5 DA |
377 | priv->next = NULL; |
378 | priv->prev = NULL; | |
1da177e4 | 379 | dev->file_first = priv; |
b5e89ed5 | 380 | dev->file_last = priv; |
1da177e4 | 381 | } else { |
b5e89ed5 DA |
382 | priv->next = NULL; |
383 | priv->prev = dev->file_last; | |
1da177e4 | 384 | dev->file_last->next = priv; |
b5e89ed5 | 385 | dev->file_last = priv; |
1da177e4 LT |
386 | } |
387 | up(&dev->struct_sem); | |
388 | ||
389 | #ifdef __alpha__ | |
390 | /* | |
391 | * Default the hose | |
392 | */ | |
393 | if (!dev->hose) { | |
394 | struct pci_dev *pci_dev; | |
395 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
396 | if (pci_dev) { | |
397 | dev->hose = pci_dev->sysdata; | |
398 | pci_dev_put(pci_dev); | |
399 | } | |
400 | if (!dev->hose) { | |
401 | struct pci_bus *b = pci_bus_b(pci_root_buses.next); | |
b5e89ed5 DA |
402 | if (b) |
403 | dev->hose = b->sysdata; | |
1da177e4 LT |
404 | } |
405 | } | |
406 | #endif | |
407 | ||
408 | return 0; | |
b5e89ed5 | 409 | out_free: |
1da177e4 | 410 | drm_free(priv, sizeof(*priv), DRM_MEM_FILES); |
b5e89ed5 | 411 | filp->private_data = NULL; |
1da177e4 LT |
412 | return ret; |
413 | } | |
414 | ||
415 | /** No-op. */ | |
416 | int drm_flush(struct file *filp) | |
417 | { | |
b5e89ed5 DA |
418 | drm_file_t *priv = filp->private_data; |
419 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
420 | |
421 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", | |
b5e89ed5 DA |
422 | current->pid, (long)old_encode_dev(priv->head->device), |
423 | dev->open_count); | |
1da177e4 LT |
424 | return 0; |
425 | } | |
b5e89ed5 | 426 | |
1da177e4 LT |
427 | EXPORT_SYMBOL(drm_flush); |
428 | ||
429 | /** No-op. */ | |
430 | int drm_fasync(int fd, struct file *filp, int on) | |
431 | { | |
b5e89ed5 DA |
432 | drm_file_t *priv = filp->private_data; |
433 | drm_device_t *dev = priv->head->dev; | |
434 | int retcode; | |
1da177e4 | 435 | |
b5e89ed5 DA |
436 | DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, |
437 | (long)old_encode_dev(priv->head->device)); | |
1da177e4 | 438 | retcode = fasync_helper(fd, filp, on, &dev->buf_async); |
b5e89ed5 DA |
439 | if (retcode < 0) |
440 | return retcode; | |
1da177e4 LT |
441 | return 0; |
442 | } | |
b5e89ed5 | 443 | |
1da177e4 LT |
444 | EXPORT_SYMBOL(drm_fasync); |
445 | ||
446 | /** No-op. */ | |
447 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) | |
448 | { | |
449 | return 0; | |
450 | } | |
1da177e4 | 451 | |
b5e89ed5 | 452 | EXPORT_SYMBOL(drm_poll); |