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Commit | Line | Data |
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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" | |
d985c108 | 38 | #include "drm_sarea.h" |
1da177e4 | 39 | #include <linux/poll.h> |
70ffa16e | 40 | #include <linux/smp_lock.h> |
1da177e4 | 41 | |
b5e89ed5 | 42 | static int drm_open_helper(struct inode *inode, struct file *filp, |
84b1fd10 | 43 | struct drm_device * dev); |
c94f7029 | 44 | |
84b1fd10 | 45 | static int drm_setup(struct drm_device * dev) |
1da177e4 | 46 | { |
d985c108 | 47 | drm_local_map_t *map; |
1da177e4 LT |
48 | int i; |
49 | int ret; | |
11d9c2fd | 50 | u32 sareapage; |
1da177e4 | 51 | |
22eae947 DA |
52 | if (dev->driver->firstopen) { |
53 | ret = dev->driver->firstopen(dev); | |
b5e89ed5 | 54 | if (ret != 0) |
1da177e4 LT |
55 | return ret; |
56 | } | |
57 | ||
1f4eccfd TH |
58 | dev->magicfree.next = NULL; |
59 | ||
d985c108 | 60 | /* prebuild the SAREA */ |
4b560fde | 61 | sareapage = max_t(unsigned, SAREA_MAX, PAGE_SIZE); |
11d9c2fd | 62 | i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map); |
d985c108 DA |
63 | if (i != 0) |
64 | return i; | |
65 | ||
b5e89ed5 DA |
66 | atomic_set(&dev->ioctl_count, 0); |
67 | atomic_set(&dev->vma_count, 0); | |
1da177e4 | 68 | dev->buf_use = 0; |
b5e89ed5 | 69 | atomic_set(&dev->buf_alloc, 0); |
1da177e4 | 70 | |
b5e89ed5 DA |
71 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) { |
72 | i = drm_dma_setup(dev); | |
73 | if (i < 0) | |
1da177e4 LT |
74 | return i; |
75 | } | |
76 | ||
3d77461e | 77 | for (i = 0; i < ARRAY_SIZE(dev->counts); i++) |
b5e89ed5 | 78 | atomic_set(&dev->counts[i], 0); |
1da177e4 | 79 | |
8669cbc5 TH |
80 | drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER); |
81 | INIT_LIST_HEAD(&dev->magicfree); | |
1da177e4 | 82 | |
11d9c2fd | 83 | dev->sigdata.lock = NULL; |
b5e89ed5 | 84 | init_waitqueue_head(&dev->lock.lock_queue); |
1da177e4 LT |
85 | dev->queue_count = 0; |
86 | dev->queue_reserved = 0; | |
87 | dev->queue_slots = 0; | |
88 | dev->queuelist = NULL; | |
89 | dev->irq_enabled = 0; | |
90 | dev->context_flag = 0; | |
91 | dev->interrupt_flag = 0; | |
92 | dev->dma_flag = 0; | |
93 | dev->last_context = 0; | |
94 | dev->last_switch = 0; | |
95 | dev->last_checked = 0; | |
b5e89ed5 | 96 | init_waitqueue_head(&dev->context_wait); |
1da177e4 LT |
97 | dev->if_version = 0; |
98 | ||
99 | dev->ctx_start = 0; | |
100 | dev->lck_start = 0; | |
101 | ||
1da177e4 | 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 | */ | |
1da177e4 LT |
115 | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /** | |
120 | * Open file. | |
b5e89ed5 | 121 | * |
1da177e4 LT |
122 | * \param inode device inode |
123 | * \param filp file pointer. | |
124 | * \return zero on success or a negative number on failure. | |
125 | * | |
126 | * Searches the DRM device with the same minor number, calls open_helper(), and | |
127 | * increments the device open count. If the open count was previous at zero, | |
128 | * i.e., it's the first that the device is open, then calls setup(). | |
129 | */ | |
b5e89ed5 | 130 | int drm_open(struct inode *inode, struct file *filp) |
1da177e4 | 131 | { |
84b1fd10 | 132 | struct drm_device *dev = NULL; |
2c14f28b DA |
133 | int minor_id = iminor(inode); |
134 | struct drm_minor *minor; | |
1da177e4 LT |
135 | int retcode = 0; |
136 | ||
2c14f28b DA |
137 | minor = idr_find(&drm_minors_idr, minor_id); |
138 | if (!minor) | |
1da177e4 | 139 | return -ENODEV; |
b5e89ed5 | 140 | |
2c14f28b | 141 | if (!(dev = minor->dev)) |
1da177e4 | 142 | return -ENODEV; |
b5e89ed5 DA |
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); | |
1da177e4 | 151 | } |
b5e89ed5 | 152 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
153 | } |
154 | ||
155 | return retcode; | |
156 | } | |
157 | EXPORT_SYMBOL(drm_open); | |
158 | ||
d985c108 DA |
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 | { | |
84b1fd10 | 170 | struct drm_device *dev = NULL; |
2c14f28b DA |
171 | struct drm_minor *minor; |
172 | int minor_id = iminor(inode); | |
d985c108 | 173 | int err = -ENODEV; |
99ac48f5 | 174 | const struct file_operations *old_fops; |
d985c108 DA |
175 | |
176 | DRM_DEBUG("\n"); | |
177 | ||
70ffa16e JC |
178 | /* BKL pushdown: note that nothing else serializes idr_find() */ |
179 | lock_kernel(); | |
2c14f28b DA |
180 | minor = idr_find(&drm_minors_idr, minor_id); |
181 | if (!minor) | |
70ffa16e | 182 | goto out; |
d985c108 | 183 | |
2c14f28b | 184 | if (!(dev = minor->dev)) |
70ffa16e | 185 | goto out; |
d985c108 DA |
186 | |
187 | old_fops = filp->f_op; | |
188 | filp->f_op = fops_get(&dev->driver->fops); | |
189 | if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { | |
190 | fops_put(filp->f_op); | |
191 | filp->f_op = fops_get(old_fops); | |
192 | } | |
193 | fops_put(old_fops); | |
194 | ||
70ffa16e JC |
195 | out: |
196 | unlock_kernel(); | |
d985c108 DA |
197 | return err; |
198 | } | |
199 | ||
200 | /** | |
201 | * Check whether DRI will run on this CPU. | |
202 | * | |
203 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. | |
204 | */ | |
205 | static int drm_cpu_valid(void) | |
206 | { | |
207 | #if defined(__i386__) | |
208 | if (boot_cpu_data.x86 == 3) | |
209 | return 0; /* No cmpxchg on a 386 */ | |
210 | #endif | |
211 | #if defined(__sparc__) && !defined(__sparc_v9__) | |
212 | return 0; /* No cmpxchg before v9 sparc. */ | |
213 | #endif | |
214 | return 1; | |
215 | } | |
216 | ||
217 | /** | |
218 | * Called whenever a process opens /dev/drm. | |
219 | * | |
220 | * \param inode device inode. | |
221 | * \param filp file pointer. | |
222 | * \param dev device. | |
223 | * \return zero on success or a negative number on failure. | |
224 | * | |
225 | * Creates and initializes a drm_file structure for the file private data in \p | |
226 | * filp and add it into the double linked list in \p dev. | |
227 | */ | |
228 | static int drm_open_helper(struct inode *inode, struct file *filp, | |
84b1fd10 | 229 | struct drm_device * dev) |
d985c108 | 230 | { |
2c14f28b | 231 | int minor_id = iminor(inode); |
84b1fd10 | 232 | struct drm_file *priv; |
d985c108 DA |
233 | int ret; |
234 | ||
235 | if (filp->f_flags & O_EXCL) | |
236 | return -EBUSY; /* No exclusive opens */ | |
237 | if (!drm_cpu_valid()) | |
238 | return -EINVAL; | |
239 | ||
2c14f28b | 240 | DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id); |
d985c108 DA |
241 | |
242 | priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); | |
243 | if (!priv) | |
244 | return -ENOMEM; | |
245 | ||
246 | memset(priv, 0, sizeof(*priv)); | |
247 | filp->private_data = priv; | |
6c340eac | 248 | priv->filp = filp; |
2df68b43 | 249 | priv->uid = current_euid(); |
ba25f9dc | 250 | priv->pid = task_pid_nr(current); |
2c14f28b | 251 | priv->minor = idr_find(&drm_minors_idr, minor_id); |
d985c108 DA |
252 | priv->ioctl_count = 0; |
253 | /* for compatibility root is always authenticated */ | |
254 | priv->authenticated = capable(CAP_SYS_ADMIN); | |
255 | priv->lock_count = 0; | |
256 | ||
bd1b331f DA |
257 | INIT_LIST_HEAD(&priv->lhead); |
258 | ||
d985c108 DA |
259 | if (dev->driver->open) { |
260 | ret = dev->driver->open(dev, priv); | |
261 | if (ret < 0) | |
262 | goto out_free; | |
263 | } | |
264 | ||
30e2fb18 | 265 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 266 | if (list_empty(&dev->filelist)) |
d985c108 | 267 | priv->master = 1; |
bd1b331f DA |
268 | |
269 | list_add(&priv->lhead, &dev->filelist); | |
30e2fb18 | 270 | mutex_unlock(&dev->struct_mutex); |
d985c108 DA |
271 | |
272 | #ifdef __alpha__ | |
273 | /* | |
274 | * Default the hose | |
275 | */ | |
276 | if (!dev->hose) { | |
277 | struct pci_dev *pci_dev; | |
278 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
279 | if (pci_dev) { | |
280 | dev->hose = pci_dev->sysdata; | |
281 | pci_dev_put(pci_dev); | |
282 | } | |
283 | if (!dev->hose) { | |
284 | struct pci_bus *b = pci_bus_b(pci_root_buses.next); | |
285 | if (b) | |
286 | dev->hose = b->sysdata; | |
287 | } | |
288 | } | |
289 | #endif | |
290 | ||
291 | return 0; | |
292 | out_free: | |
293 | drm_free(priv, sizeof(*priv), DRM_MEM_FILES); | |
294 | filp->private_data = NULL; | |
295 | return ret; | |
296 | } | |
297 | ||
298 | /** No-op. */ | |
299 | int drm_fasync(int fd, struct file *filp, int on) | |
300 | { | |
84b1fd10 | 301 | struct drm_file *priv = filp->private_data; |
2c14f28b | 302 | struct drm_device *dev = priv->minor->dev; |
d985c108 DA |
303 | int retcode; |
304 | ||
305 | DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, | |
2c14f28b | 306 | (long)old_encode_dev(priv->minor->device)); |
d985c108 DA |
307 | retcode = fasync_helper(fd, filp, on, &dev->buf_async); |
308 | if (retcode < 0) | |
309 | return retcode; | |
310 | return 0; | |
311 | } | |
312 | EXPORT_SYMBOL(drm_fasync); | |
313 | ||
1da177e4 LT |
314 | /** |
315 | * Release file. | |
316 | * | |
317 | * \param inode device inode | |
6c340eac | 318 | * \param file_priv DRM file private. |
1da177e4 LT |
319 | * \return zero on success or a negative number on failure. |
320 | * | |
321 | * If the hardware lock is held then free it, and take it again for the kernel | |
322 | * context since it's necessary to reclaim buffers. Unlink the file private | |
323 | * data from its list and free it. Decreases the open count and if it reaches | |
22eae947 | 324 | * zero calls drm_lastclose(). |
1da177e4 | 325 | */ |
b5e89ed5 | 326 | int drm_release(struct inode *inode, struct file *filp) |
1da177e4 | 327 | { |
6c340eac | 328 | struct drm_file *file_priv = filp->private_data; |
2c14f28b | 329 | struct drm_device *dev = file_priv->minor->dev; |
1da177e4 LT |
330 | int retcode = 0; |
331 | ||
332 | lock_kernel(); | |
1da177e4 | 333 | |
b5e89ed5 | 334 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
1da177e4 | 335 | |
22eae947 | 336 | if (dev->driver->preclose) |
6c340eac | 337 | dev->driver->preclose(dev, file_priv); |
1da177e4 LT |
338 | |
339 | /* ======================================================== | |
340 | * Begin inline drm_release | |
341 | */ | |
342 | ||
b5e89ed5 | 343 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
ba25f9dc | 344 | task_pid_nr(current), |
2c14f28b | 345 | (long)old_encode_dev(file_priv->minor->device), |
b5e89ed5 DA |
346 | dev->open_count); |
347 | ||
040ac320 | 348 | if (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) { |
c153f45f | 349 | if (drm_i_have_hw_lock(dev, file_priv)) { |
6c340eac | 350 | dev->driver->reclaim_buffers_locked(dev, file_priv); |
040ac320 | 351 | } else { |
b74e2082 | 352 | unsigned long endtime = jiffies + 3 * DRM_HZ; |
040ac320 TH |
353 | int locked = 0; |
354 | ||
355 | drm_idlelock_take(&dev->lock); | |
356 | ||
357 | /* | |
358 | * Wait for a while. | |
359 | */ | |
360 | ||
361 | do{ | |
f116cc56 | 362 | spin_lock_bh(&dev->lock.spinlock); |
040ac320 | 363 | locked = dev->lock.idle_has_lock; |
f116cc56 | 364 | spin_unlock_bh(&dev->lock.spinlock); |
040ac320 TH |
365 | if (locked) |
366 | break; | |
367 | schedule(); | |
b74e2082 | 368 | } while (!time_after_eq(jiffies, endtime)); |
040ac320 TH |
369 | |
370 | if (!locked) { | |
371 | DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n" | |
372 | "\tdriver to use reclaim_buffers_idlelocked() instead.\n" | |
373 | "\tI will go on reclaiming the buffers anyway.\n"); | |
1da177e4 | 374 | } |
040ac320 | 375 | |
6c340eac | 376 | dev->driver->reclaim_buffers_locked(dev, file_priv); |
040ac320 | 377 | drm_idlelock_release(&dev->lock); |
1da177e4 LT |
378 | } |
379 | } | |
b5e89ed5 | 380 | |
040ac320 TH |
381 | if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) { |
382 | ||
383 | drm_idlelock_take(&dev->lock); | |
6c340eac | 384 | dev->driver->reclaim_buffers_idlelocked(dev, file_priv); |
040ac320 TH |
385 | drm_idlelock_release(&dev->lock); |
386 | ||
387 | } | |
388 | ||
c153f45f | 389 | if (drm_i_have_hw_lock(dev, file_priv)) { |
040ac320 TH |
390 | DRM_DEBUG("File %p released, freeing lock for context %d\n", |
391 | filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
392 | ||
393 | drm_lock_free(&dev->lock, | |
394 | _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); | |
395 | } | |
396 | ||
397 | ||
22eae947 DA |
398 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && |
399 | !dev->driver->reclaim_buffers_locked) { | |
6c340eac | 400 | dev->driver->reclaim_buffers(dev, file_priv); |
1da177e4 LT |
401 | } |
402 | ||
b5e89ed5 | 403 | drm_fasync(-1, filp, 0); |
1da177e4 | 404 | |
30e2fb18 | 405 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 406 | if (!list_empty(&dev->ctxlist)) { |
55910517 | 407 | struct drm_ctx_list *pos, *n; |
1da177e4 | 408 | |
bd1b331f | 409 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
6c340eac | 410 | if (pos->tag == file_priv && |
b5e89ed5 | 411 | pos->handle != DRM_KERNEL_CONTEXT) { |
1da177e4 | 412 | if (dev->driver->context_dtor) |
b5e89ed5 DA |
413 | dev->driver->context_dtor(dev, |
414 | pos->handle); | |
1da177e4 | 415 | |
b5e89ed5 | 416 | drm_ctxbitmap_free(dev, pos->handle); |
1da177e4 | 417 | |
b5e89ed5 DA |
418 | list_del(&pos->head); |
419 | drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); | |
1da177e4 LT |
420 | --dev->ctx_count; |
421 | } | |
422 | } | |
423 | } | |
30e2fb18 | 424 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 | 425 | |
30e2fb18 | 426 | mutex_lock(&dev->struct_mutex); |
6c340eac | 427 | if (file_priv->remove_auth_on_close == 1) { |
84b1fd10 | 428 | struct drm_file *temp; |
bd1b331f DA |
429 | |
430 | list_for_each_entry(temp, &dev->filelist, lhead) | |
1da177e4 | 431 | temp->authenticated = 0; |
1da177e4 | 432 | } |
6c340eac | 433 | list_del(&file_priv->lhead); |
30e2fb18 | 434 | mutex_unlock(&dev->struct_mutex); |
b5e89ed5 | 435 | |
22eae947 | 436 | if (dev->driver->postclose) |
6c340eac EA |
437 | dev->driver->postclose(dev, file_priv); |
438 | drm_free(file_priv, sizeof(*file_priv), DRM_MEM_FILES); | |
1da177e4 LT |
439 | |
440 | /* ======================================================== | |
441 | * End inline drm_release | |
442 | */ | |
443 | ||
b5e89ed5 DA |
444 | atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); |
445 | spin_lock(&dev->count_lock); | |
446 | if (!--dev->open_count) { | |
447 | if (atomic_read(&dev->ioctl_count) || dev->blocked) { | |
448 | DRM_ERROR("Device busy: %d %d\n", | |
449 | atomic_read(&dev->ioctl_count), dev->blocked); | |
450 | spin_unlock(&dev->count_lock); | |
1da177e4 LT |
451 | unlock_kernel(); |
452 | return -EBUSY; | |
453 | } | |
b5e89ed5 | 454 | spin_unlock(&dev->count_lock); |
1da177e4 | 455 | unlock_kernel(); |
22eae947 | 456 | return drm_lastclose(dev); |
1da177e4 | 457 | } |
b5e89ed5 | 458 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
459 | |
460 | unlock_kernel(); | |
461 | ||
462 | return retcode; | |
463 | } | |
464 | EXPORT_SYMBOL(drm_release); | |
465 | ||
1da177e4 LT |
466 | /** No-op. */ |
467 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) | |
468 | { | |
469 | return 0; | |
470 | } | |
b5e89ed5 | 471 | EXPORT_SYMBOL(drm_poll); |