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1 | /** | |
2 | * \file drm_fops.c | |
3 | * File operations for DRM | |
4 | * | |
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 "drm_sarea.h" | |
39 | #include <linux/poll.h> | |
40 | ||
41 | static int drm_open_helper(struct inode *inode, struct file *filp, | |
42 | struct drm_device * dev); | |
43 | ||
44 | static int drm_setup(struct drm_device * dev) | |
45 | { | |
46 | drm_local_map_t *map; | |
47 | int i; | |
48 | int ret; | |
49 | u32 sareapage; | |
50 | ||
51 | if (dev->driver->firstopen) { | |
52 | ret = dev->driver->firstopen(dev); | |
53 | if (ret != 0) | |
54 | return ret; | |
55 | } | |
56 | ||
57 | dev->magicfree.next = NULL; | |
58 | ||
59 | /* prebuild the SAREA */ | |
60 | sareapage = max_t(unsigned, SAREA_MAX, PAGE_SIZE); | |
61 | i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map); | |
62 | if (i != 0) | |
63 | return i; | |
64 | ||
65 | atomic_set(&dev->ioctl_count, 0); | |
66 | atomic_set(&dev->vma_count, 0); | |
67 | dev->buf_use = 0; | |
68 | atomic_set(&dev->buf_alloc, 0); | |
69 | ||
70 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) { | |
71 | i = drm_dma_setup(dev); | |
72 | if (i < 0) | |
73 | return i; | |
74 | } | |
75 | ||
76 | for (i = 0; i < ARRAY_SIZE(dev->counts); i++) | |
77 | atomic_set(&dev->counts[i], 0); | |
78 | ||
79 | drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER); | |
80 | INIT_LIST_HEAD(&dev->magicfree); | |
81 | ||
82 | dev->sigdata.lock = NULL; | |
83 | init_waitqueue_head(&dev->lock.lock_queue); | |
84 | dev->queue_count = 0; | |
85 | dev->queue_reserved = 0; | |
86 | dev->queue_slots = 0; | |
87 | dev->queuelist = NULL; | |
88 | dev->irq_enabled = 0; | |
89 | dev->context_flag = 0; | |
90 | dev->interrupt_flag = 0; | |
91 | dev->dma_flag = 0; | |
92 | dev->last_context = 0; | |
93 | dev->last_switch = 0; | |
94 | dev->last_checked = 0; | |
95 | init_waitqueue_head(&dev->context_wait); | |
96 | dev->if_version = 0; | |
97 | ||
98 | dev->ctx_start = 0; | |
99 | dev->lck_start = 0; | |
100 | ||
101 | dev->buf_async = NULL; | |
102 | init_waitqueue_head(&dev->buf_readers); | |
103 | init_waitqueue_head(&dev->buf_writers); | |
104 | ||
105 | DRM_DEBUG("\n"); | |
106 | ||
107 | /* | |
108 | * The kernel's context could be created here, but is now created | |
109 | * in drm_dma_enqueue. This is more resource-efficient for | |
110 | * hardware that does not do DMA, but may mean that | |
111 | * drm_select_queue fails between the time the interrupt is | |
112 | * initialized and the time the queues are initialized. | |
113 | */ | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | /** | |
119 | * Open file. | |
120 | * | |
121 | * \param inode device inode | |
122 | * \param filp file pointer. | |
123 | * \return zero on success or a negative number on failure. | |
124 | * | |
125 | * Searches the DRM device with the same minor number, calls open_helper(), and | |
126 | * increments the device open count. If the open count was previous at zero, | |
127 | * i.e., it's the first that the device is open, then calls setup(). | |
128 | */ | |
129 | int drm_open(struct inode *inode, struct file *filp) | |
130 | { | |
131 | struct drm_device *dev = NULL; | |
132 | int minor = iminor(inode); | |
133 | int retcode = 0; | |
134 | ||
135 | if (!((minor >= 0) && (minor < drm_cards_limit))) | |
136 | return -ENODEV; | |
137 | ||
138 | if (!drm_heads[minor]) | |
139 | return -ENODEV; | |
140 | ||
141 | if (!(dev = drm_heads[minor]->dev)) | |
142 | return -ENODEV; | |
143 | ||
144 | retcode = drm_open_helper(inode, filp, dev); | |
145 | if (!retcode) { | |
146 | atomic_inc(&dev->counts[_DRM_STAT_OPENS]); | |
147 | spin_lock(&dev->count_lock); | |
148 | if (!dev->open_count++) { | |
149 | spin_unlock(&dev->count_lock); | |
150 | return drm_setup(dev); | |
151 | } | |
152 | spin_unlock(&dev->count_lock); | |
153 | } | |
154 | ||
155 | return retcode; | |
156 | } | |
157 | EXPORT_SYMBOL(drm_open); | |
158 | ||
159 | /** | |
160 | * File \c open operation. | |
161 | * | |
162 | * \param inode device inode. | |
163 | * \param filp file pointer. | |
164 | * | |
165 | * Puts the dev->fops corresponding to the device minor number into | |
166 | * \p filp, call the \c open method, and restore the file operations. | |
167 | */ | |
168 | int drm_stub_open(struct inode *inode, struct file *filp) | |
169 | { | |
170 | struct drm_device *dev = NULL; | |
171 | int minor = iminor(inode); | |
172 | int err = -ENODEV; | |
173 | const struct file_operations *old_fops; | |
174 | ||
175 | DRM_DEBUG("\n"); | |
176 | ||
177 | if (!((minor >= 0) && (minor < drm_cards_limit))) | |
178 | return -ENODEV; | |
179 | ||
180 | if (!drm_heads[minor]) | |
181 | return -ENODEV; | |
182 | ||
183 | if (!(dev = drm_heads[minor]->dev)) | |
184 | return -ENODEV; | |
185 | ||
186 | old_fops = filp->f_op; | |
187 | filp->f_op = fops_get(&dev->driver->fops); | |
188 | if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { | |
189 | fops_put(filp->f_op); | |
190 | filp->f_op = fops_get(old_fops); | |
191 | } | |
192 | fops_put(old_fops); | |
193 | ||
194 | return err; | |
195 | } | |
196 | ||
197 | /** | |
198 | * Check whether DRI will run on this CPU. | |
199 | * | |
200 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. | |
201 | */ | |
202 | static int drm_cpu_valid(void) | |
203 | { | |
204 | #if defined(__i386__) | |
205 | if (boot_cpu_data.x86 == 3) | |
206 | return 0; /* No cmpxchg on a 386 */ | |
207 | #endif | |
208 | #if defined(__sparc__) && !defined(__sparc_v9__) | |
209 | return 0; /* No cmpxchg before v9 sparc. */ | |
210 | #endif | |
211 | return 1; | |
212 | } | |
213 | ||
214 | /** | |
215 | * Called whenever a process opens /dev/drm. | |
216 | * | |
217 | * \param inode device inode. | |
218 | * \param filp file pointer. | |
219 | * \param dev device. | |
220 | * \return zero on success or a negative number on failure. | |
221 | * | |
222 | * Creates and initializes a drm_file structure for the file private data in \p | |
223 | * filp and add it into the double linked list in \p dev. | |
224 | */ | |
225 | static int drm_open_helper(struct inode *inode, struct file *filp, | |
226 | struct drm_device * dev) | |
227 | { | |
228 | int minor = iminor(inode); | |
229 | struct drm_file *priv; | |
230 | int ret; | |
231 | ||
232 | if (filp->f_flags & O_EXCL) | |
233 | return -EBUSY; /* No exclusive opens */ | |
234 | if (!drm_cpu_valid()) | |
235 | return -EINVAL; | |
236 | ||
237 | DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor); | |
238 | ||
239 | priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); | |
240 | if (!priv) | |
241 | return -ENOMEM; | |
242 | ||
243 | memset(priv, 0, sizeof(*priv)); | |
244 | filp->private_data = priv; | |
245 | priv->filp = filp; | |
246 | priv->uid = current->euid; | |
247 | priv->pid = task_pid_nr(current); | |
248 | priv->minor = minor; | |
249 | priv->head = drm_heads[minor]; | |
250 | priv->ioctl_count = 0; | |
251 | /* for compatibility root is always authenticated */ | |
252 | priv->authenticated = capable(CAP_SYS_ADMIN); | |
253 | priv->lock_count = 0; | |
254 | ||
255 | INIT_LIST_HEAD(&priv->lhead); | |
256 | ||
257 | if (dev->driver->open) { | |
258 | ret = dev->driver->open(dev, priv); | |
259 | if (ret < 0) | |
260 | goto out_free; | |
261 | } | |
262 | ||
263 | mutex_lock(&dev->struct_mutex); | |
264 | if (list_empty(&dev->filelist)) | |
265 | priv->master = 1; | |
266 | ||
267 | list_add(&priv->lhead, &dev->filelist); | |
268 | mutex_unlock(&dev->struct_mutex); | |
269 | ||
270 | #ifdef __alpha__ | |
271 | /* | |
272 | * Default the hose | |
273 | */ | |
274 | if (!dev->hose) { | |
275 | struct pci_dev *pci_dev; | |
276 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
277 | if (pci_dev) { | |
278 | dev->hose = pci_dev->sysdata; | |
279 | pci_dev_put(pci_dev); | |
280 | } | |
281 | if (!dev->hose) { | |
282 | struct pci_bus *b = pci_bus_b(pci_root_buses.next); | |
283 | if (b) | |
284 | dev->hose = b->sysdata; | |
285 | } | |
286 | } | |
287 | #endif | |
288 | ||
289 | return 0; | |
290 | out_free: | |
291 | drm_free(priv, sizeof(*priv), DRM_MEM_FILES); | |
292 | filp->private_data = NULL; | |
293 | return ret; | |
294 | } | |
295 | ||
296 | /** No-op. */ | |
297 | int drm_fasync(int fd, struct file *filp, int on) | |
298 | { | |
299 | struct drm_file *priv = filp->private_data; | |
300 | struct drm_device *dev = priv->head->dev; | |
301 | int retcode; | |
302 | ||
303 | DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, | |
304 | (long)old_encode_dev(priv->head->device)); | |
305 | retcode = fasync_helper(fd, filp, on, &dev->buf_async); | |
306 | if (retcode < 0) | |
307 | return retcode; | |
308 | return 0; | |
309 | } | |
310 | EXPORT_SYMBOL(drm_fasync); | |
311 | ||
312 | /** | |
313 | * Release file. | |
314 | * | |
315 | * \param inode device inode | |
316 | * \param file_priv DRM file private. | |
317 | * \return zero on success or a negative number on failure. | |
318 | * | |
319 | * If the hardware lock is held then free it, and take it again for the kernel | |
320 | * context since it's necessary to reclaim buffers. Unlink the file private | |
321 | * data from its list and free it. Decreases the open count and if it reaches | |
322 | * zero calls drm_lastclose(). | |
323 | */ | |
324 | int drm_release(struct inode *inode, struct file *filp) | |
325 | { | |
326 | struct drm_file *file_priv = filp->private_data; | |
327 | struct drm_device *dev = file_priv->head->dev; | |
328 | int retcode = 0; | |
329 | ||
330 | lock_kernel(); | |
331 | ||
332 | DRM_DEBUG("open_count = %d\n", dev->open_count); | |
333 | ||
334 | if (dev->driver->preclose) | |
335 | dev->driver->preclose(dev, file_priv); | |
336 | ||
337 | /* ======================================================== | |
338 | * Begin inline drm_release | |
339 | */ | |
340 | ||
341 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", | |
342 | task_pid_nr(current), | |
343 | (long)old_encode_dev(file_priv->head->device), | |
344 | dev->open_count); | |
345 | ||
346 | if (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) { | |
347 | if (drm_i_have_hw_lock(dev, file_priv)) { | |
348 | dev->driver->reclaim_buffers_locked(dev, file_priv); | |
349 | } else { | |
350 | unsigned long _end=jiffies + 3*DRM_HZ; | |
351 | int locked = 0; | |
352 | ||
353 | drm_idlelock_take(&dev->lock); | |
354 | ||
355 | /* | |
356 | * Wait for a while. | |
357 | */ | |
358 | ||
359 | do{ | |
360 | spin_lock(&dev->lock.spinlock); | |
361 | locked = dev->lock.idle_has_lock; | |
362 | spin_unlock(&dev->lock.spinlock); | |
363 | if (locked) | |
364 | break; | |
365 | schedule(); | |
366 | } while (!time_after_eq(jiffies, _end)); | |
367 | ||
368 | if (!locked) { | |
369 | DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n" | |
370 | "\tdriver to use reclaim_buffers_idlelocked() instead.\n" | |
371 | "\tI will go on reclaiming the buffers anyway.\n"); | |
372 | } | |
373 | ||
374 | dev->driver->reclaim_buffers_locked(dev, file_priv); | |
375 | drm_idlelock_release(&dev->lock); | |
376 | } | |
377 | } | |
378 | ||
379 | if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) { | |
380 | ||
381 | drm_idlelock_take(&dev->lock); | |
382 | dev->driver->reclaim_buffers_idlelocked(dev, file_priv); | |
383 | drm_idlelock_release(&dev->lock); | |
384 | ||
385 | } | |
386 | ||
387 | if (drm_i_have_hw_lock(dev, file_priv)) { | |
388 | DRM_DEBUG("File %p released, freeing lock for context %d\n", | |
389 | filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
390 | ||
391 | drm_lock_free(&dev->lock, | |
392 | _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
393 | } | |
394 | ||
395 | ||
396 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && | |
397 | !dev->driver->reclaim_buffers_locked) { | |
398 | dev->driver->reclaim_buffers(dev, file_priv); | |
399 | } | |
400 | ||
401 | drm_fasync(-1, filp, 0); | |
402 | ||
403 | mutex_lock(&dev->ctxlist_mutex); | |
404 | if (!list_empty(&dev->ctxlist)) { | |
405 | struct drm_ctx_list *pos, *n; | |
406 | ||
407 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { | |
408 | if (pos->tag == file_priv && | |
409 | pos->handle != DRM_KERNEL_CONTEXT) { | |
410 | if (dev->driver->context_dtor) | |
411 | dev->driver->context_dtor(dev, | |
412 | pos->handle); | |
413 | ||
414 | drm_ctxbitmap_free(dev, pos->handle); | |
415 | ||
416 | list_del(&pos->head); | |
417 | drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); | |
418 | --dev->ctx_count; | |
419 | } | |
420 | } | |
421 | } | |
422 | mutex_unlock(&dev->ctxlist_mutex); | |
423 | ||
424 | mutex_lock(&dev->struct_mutex); | |
425 | if (file_priv->remove_auth_on_close == 1) { | |
426 | struct drm_file *temp; | |
427 | ||
428 | list_for_each_entry(temp, &dev->filelist, lhead) | |
429 | temp->authenticated = 0; | |
430 | } | |
431 | list_del(&file_priv->lhead); | |
432 | mutex_unlock(&dev->struct_mutex); | |
433 | ||
434 | if (dev->driver->postclose) | |
435 | dev->driver->postclose(dev, file_priv); | |
436 | drm_free(file_priv, sizeof(*file_priv), DRM_MEM_FILES); | |
437 | ||
438 | /* ======================================================== | |
439 | * End inline drm_release | |
440 | */ | |
441 | ||
442 | atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); | |
443 | spin_lock(&dev->count_lock); | |
444 | if (!--dev->open_count) { | |
445 | if (atomic_read(&dev->ioctl_count) || dev->blocked) { | |
446 | DRM_ERROR("Device busy: %d %d\n", | |
447 | atomic_read(&dev->ioctl_count), dev->blocked); | |
448 | spin_unlock(&dev->count_lock); | |
449 | unlock_kernel(); | |
450 | return -EBUSY; | |
451 | } | |
452 | spin_unlock(&dev->count_lock); | |
453 | unlock_kernel(); | |
454 | return drm_lastclose(dev); | |
455 | } | |
456 | spin_unlock(&dev->count_lock); | |
457 | ||
458 | unlock_kernel(); | |
459 | ||
460 | return retcode; | |
461 | } | |
462 | EXPORT_SYMBOL(drm_release); | |
463 | ||
464 | /** No-op. */ | |
465 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) | |
466 | { | |
467 | return 0; | |
468 | } | |
469 | EXPORT_SYMBOL(drm_poll); |