3 * File operations for DRM
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Daryll Strauss <daryll@valinux.com>
7 * \author Gareth Hughes <gareth@valinux.com>
11 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
13 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
14 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
15 * All Rights Reserved.
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:
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
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.
38 #include <linux/poll.h>
39 #include <linux/slab.h>
40 #include <linux/module.h>
42 /* from BKL pushdown: note that nothing else serializes idr_find() */
43 DEFINE_MUTEX(drm_global_mutex);
44 EXPORT_SYMBOL(drm_global_mutex);
46 static int drm_open_helper(struct inode *inode, struct file *filp,
47 struct drm_minor *minor);
49 static int drm_setup(struct drm_device * dev)
53 if (dev->driver->firstopen &&
54 !drm_core_check_feature(dev, DRIVER_MODESET)) {
55 ret = dev->driver->firstopen(dev);
60 ret = drm_legacy_dma_setup(dev);
72 * \param inode device inode
73 * \param filp file pointer.
74 * \return zero on success or a negative number on failure.
76 * Searches the DRM device with the same minor number, calls open_helper(), and
77 * increments the device open count. If the open count was previous at zero,
78 * i.e., it's the first that the device is open, then calls setup().
80 int drm_open(struct inode *inode, struct file *filp)
82 struct drm_device *dev;
83 struct drm_minor *minor;
87 minor = drm_minor_acquire(iminor(inode));
89 return PTR_ERR(minor);
92 if (drm_device_is_unplugged(dev)) {
97 if (!dev->open_count++)
100 /* share address_space across all char-devs of a single device */
101 filp->f_mapping = dev->anon_inode->i_mapping;
103 retcode = drm_open_helper(inode, filp, minor);
107 retcode = drm_setup(dev);
116 drm_minor_release(minor);
119 EXPORT_SYMBOL(drm_open);
122 * File \c open operation.
124 * \param inode device inode.
125 * \param filp file pointer.
127 * Puts the dev->fops corresponding to the device minor number into
128 * \p filp, call the \c open method, and restore the file operations.
130 int drm_stub_open(struct inode *inode, struct file *filp)
132 struct drm_device *dev;
133 struct drm_minor *minor;
135 const struct file_operations *new_fops;
139 mutex_lock(&drm_global_mutex);
140 minor = drm_minor_acquire(iminor(inode));
145 if (drm_device_is_unplugged(dev))
148 new_fops = fops_get(dev->driver->fops);
152 replace_fops(filp, new_fops);
153 if (filp->f_op->open)
154 err = filp->f_op->open(inode, filp);
157 drm_minor_release(minor);
159 mutex_unlock(&drm_global_mutex);
164 * Check whether DRI will run on this CPU.
166 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
168 static int drm_cpu_valid(void)
170 #if defined(__i386__)
171 if (boot_cpu_data.x86 == 3)
172 return 0; /* No cmpxchg on a 386 */
174 #if defined(__sparc__) && !defined(__sparc_v9__)
175 return 0; /* No cmpxchg before v9 sparc. */
181 * Called whenever a process opens /dev/drm.
183 * \param inode device inode.
184 * \param filp file pointer.
185 * \param minor acquired minor-object.
186 * \return zero on success or a negative number on failure.
188 * Creates and initializes a drm_file structure for the file private data in \p
189 * filp and add it into the double linked list in \p dev.
191 static int drm_open_helper(struct inode *inode, struct file *filp,
192 struct drm_minor *minor)
194 struct drm_device *dev = minor->dev;
195 struct drm_file *priv;
198 if (filp->f_flags & O_EXCL)
199 return -EBUSY; /* No exclusive opens */
200 if (!drm_cpu_valid())
202 if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
205 DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index);
207 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
211 filp->private_data = priv;
213 priv->uid = current_euid();
214 priv->pid = get_pid(task_pid(current));
217 /* for compatibility root is always authenticated */
218 priv->always_authenticated = capable(CAP_SYS_ADMIN);
219 priv->authenticated = priv->always_authenticated;
220 priv->lock_count = 0;
222 INIT_LIST_HEAD(&priv->lhead);
223 INIT_LIST_HEAD(&priv->fbs);
224 mutex_init(&priv->fbs_lock);
225 INIT_LIST_HEAD(&priv->event_list);
226 init_waitqueue_head(&priv->event_wait);
227 priv->event_space = 4096; /* set aside 4k for event buffer */
229 if (dev->driver->driver_features & DRIVER_GEM)
230 drm_gem_open(dev, priv);
232 if (drm_core_check_feature(dev, DRIVER_PRIME))
233 drm_prime_init_file_private(&priv->prime);
235 if (dev->driver->open) {
236 ret = dev->driver->open(dev, priv);
238 goto out_prime_destroy;
241 /* if there is no current master make this fd it, but do not create
242 * any master object for render clients */
243 mutex_lock(&dev->master_mutex);
244 if (drm_is_primary_client(priv) && !priv->minor->master) {
245 /* create a new master */
246 priv->minor->master = drm_master_create(priv->minor);
247 if (!priv->minor->master) {
253 /* take another reference for the copy in the local file priv */
254 priv->master = drm_master_get(priv->minor->master);
255 priv->authenticated = 1;
257 if (dev->driver->master_create) {
258 ret = dev->driver->master_create(dev, priv->master);
260 /* drop both references if this fails */
261 drm_master_put(&priv->minor->master);
262 drm_master_put(&priv->master);
266 if (dev->driver->master_set) {
267 ret = dev->driver->master_set(dev, priv, true);
269 /* drop both references if this fails */
270 drm_master_put(&priv->minor->master);
271 drm_master_put(&priv->master);
275 } else if (drm_is_primary_client(priv)) {
276 /* get a reference to the master */
277 priv->master = drm_master_get(priv->minor->master);
279 mutex_unlock(&dev->master_mutex);
281 mutex_lock(&dev->struct_mutex);
282 list_add(&priv->lhead, &dev->filelist);
283 mutex_unlock(&dev->struct_mutex);
290 struct pci_dev *pci_dev;
291 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
293 dev->hose = pci_dev->sysdata;
294 pci_dev_put(pci_dev);
297 struct pci_bus *b = pci_bus_b(pci_root_buses.next);
299 dev->hose = b->sysdata;
307 mutex_unlock(&dev->master_mutex);
308 if (dev->driver->postclose)
309 dev->driver->postclose(dev, priv);
311 if (drm_core_check_feature(dev, DRIVER_PRIME))
312 drm_prime_destroy_file_private(&priv->prime);
313 if (dev->driver->driver_features & DRIVER_GEM)
314 drm_gem_release(dev, priv);
317 filp->private_data = NULL;
321 static void drm_master_release(struct drm_device *dev, struct file *filp)
323 struct drm_file *file_priv = filp->private_data;
325 if (drm_i_have_hw_lock(dev, file_priv)) {
326 DRM_DEBUG("File %p released, freeing lock for context %d\n",
327 filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
328 drm_lock_free(&file_priv->master->lock,
329 _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
333 static void drm_events_release(struct drm_file *file_priv)
335 struct drm_device *dev = file_priv->minor->dev;
336 struct drm_pending_event *e, *et;
337 struct drm_pending_vblank_event *v, *vt;
340 spin_lock_irqsave(&dev->event_lock, flags);
342 /* Remove pending flips */
343 list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
344 if (v->base.file_priv == file_priv) {
345 list_del(&v->base.link);
346 drm_vblank_put(dev, v->pipe);
347 v->base.destroy(&v->base);
350 /* Remove unconsumed events */
351 list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
356 spin_unlock_irqrestore(&dev->event_lock, flags);
360 * drm_legacy_dev_reinit
362 * Reinitializes a legacy/ums drm device in it's lastclose function.
364 static void drm_legacy_dev_reinit(struct drm_device *dev)
366 if (drm_core_check_feature(dev, DRIVER_MODESET))
369 dev->sigdata.lock = NULL;
371 dev->context_flag = 0;
372 dev->last_context = 0;
377 * Take down the DRM device.
379 * \param dev DRM device structure.
381 * Frees every resource in \p dev.
385 int drm_lastclose(struct drm_device * dev)
387 struct drm_vma_entry *vma, *vma_temp;
391 if (dev->driver->lastclose)
392 dev->driver->lastclose(dev);
393 DRM_DEBUG("driver lastclose completed\n");
395 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
396 drm_irq_uninstall(dev);
398 mutex_lock(&dev->struct_mutex);
402 drm_legacy_sg_cleanup(dev);
404 /* Clear vma list (only built for debugging) */
405 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
406 list_del(&vma->head);
410 drm_legacy_dma_takedown(dev);
412 mutex_unlock(&dev->struct_mutex);
414 drm_legacy_dev_reinit(dev);
416 DRM_DEBUG("lastclose completed\n");
423 * \param inode device inode
424 * \param file_priv DRM file private.
425 * \return zero on success or a negative number on failure.
427 * If the hardware lock is held then free it, and take it again for the kernel
428 * context since it's necessary to reclaim buffers. Unlink the file private
429 * data from its list and free it. Decreases the open count and if it reaches
430 * zero calls drm_lastclose().
432 int drm_release(struct inode *inode, struct file *filp)
434 struct drm_file *file_priv = filp->private_data;
435 struct drm_minor *minor = file_priv->minor;
436 struct drm_device *dev = minor->dev;
439 mutex_lock(&drm_global_mutex);
441 DRM_DEBUG("open_count = %d\n", dev->open_count);
443 if (dev->driver->preclose)
444 dev->driver->preclose(dev, file_priv);
446 /* ========================================================
447 * Begin inline drm_release
450 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
451 task_pid_nr(current),
452 (long)old_encode_dev(file_priv->minor->device),
455 /* Release any auth tokens that might point to this file_priv,
456 (do that under the drm_global_mutex) */
457 if (file_priv->magic)
458 (void) drm_remove_magic(file_priv->master, file_priv->magic);
460 /* if the master has gone away we can't do anything with the lock */
461 if (file_priv->minor->master)
462 drm_master_release(dev, filp);
464 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
465 drm_core_reclaim_buffers(dev, file_priv);
467 drm_events_release(file_priv);
469 if (dev->driver->driver_features & DRIVER_MODESET)
470 drm_fb_release(file_priv);
472 if (dev->driver->driver_features & DRIVER_GEM)
473 drm_gem_release(dev, file_priv);
475 mutex_lock(&dev->ctxlist_mutex);
476 if (!list_empty(&dev->ctxlist)) {
477 struct drm_ctx_list *pos, *n;
479 list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
480 if (pos->tag == file_priv &&
481 pos->handle != DRM_KERNEL_CONTEXT) {
482 if (dev->driver->context_dtor)
483 dev->driver->context_dtor(dev,
486 drm_ctxbitmap_free(dev, pos->handle);
488 list_del(&pos->head);
493 mutex_unlock(&dev->ctxlist_mutex);
495 mutex_lock(&dev->master_mutex);
497 if (file_priv->is_master) {
498 struct drm_master *master = file_priv->master;
499 struct drm_file *temp;
501 mutex_lock(&dev->struct_mutex);
502 list_for_each_entry(temp, &dev->filelist, lhead) {
503 if ((temp->master == file_priv->master) &&
505 temp->authenticated = temp->always_authenticated;
509 * Since the master is disappearing, so is the
510 * possibility to lock.
513 if (master->lock.hw_lock) {
514 if (dev->sigdata.lock == master->lock.hw_lock)
515 dev->sigdata.lock = NULL;
516 master->lock.hw_lock = NULL;
517 master->lock.file_priv = NULL;
518 wake_up_interruptible_all(&master->lock.lock_queue);
520 mutex_unlock(&dev->struct_mutex);
522 if (file_priv->minor->master == file_priv->master) {
523 /* drop the reference held my the minor */
524 if (dev->driver->master_drop)
525 dev->driver->master_drop(dev, file_priv, true);
526 drm_master_put(&file_priv->minor->master);
530 /* drop the master reference held by the file priv */
531 if (file_priv->master)
532 drm_master_put(&file_priv->master);
533 file_priv->is_master = 0;
534 mutex_unlock(&dev->master_mutex);
536 mutex_lock(&dev->struct_mutex);
537 list_del(&file_priv->lhead);
538 mutex_unlock(&dev->struct_mutex);
540 if (dev->driver->postclose)
541 dev->driver->postclose(dev, file_priv);
544 if (drm_core_check_feature(dev, DRIVER_PRIME))
545 drm_prime_destroy_file_private(&file_priv->prime);
547 put_pid(file_priv->pid);
550 /* ========================================================
551 * End inline drm_release
554 if (!--dev->open_count) {
555 retcode = drm_lastclose(dev);
556 if (drm_device_is_unplugged(dev))
559 mutex_unlock(&drm_global_mutex);
561 drm_minor_release(minor);
565 EXPORT_SYMBOL(drm_release);
568 drm_dequeue_event(struct drm_file *file_priv,
569 size_t total, size_t max, struct drm_pending_event **out)
571 struct drm_device *dev = file_priv->minor->dev;
572 struct drm_pending_event *e;
576 spin_lock_irqsave(&dev->event_lock, flags);
579 if (list_empty(&file_priv->event_list))
581 e = list_first_entry(&file_priv->event_list,
582 struct drm_pending_event, link);
583 if (e->event->length + total > max)
586 file_priv->event_space += e->event->length;
592 spin_unlock_irqrestore(&dev->event_lock, flags);
596 ssize_t drm_read(struct file *filp, char __user *buffer,
597 size_t count, loff_t *offset)
599 struct drm_file *file_priv = filp->private_data;
600 struct drm_pending_event *e;
604 ret = wait_event_interruptible(file_priv->event_wait,
605 !list_empty(&file_priv->event_list));
610 while (drm_dequeue_event(file_priv, total, count, &e)) {
611 if (copy_to_user(buffer + total,
612 e->event, e->event->length)) {
617 total += e->event->length;
623 EXPORT_SYMBOL(drm_read);
625 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
627 struct drm_file *file_priv = filp->private_data;
628 unsigned int mask = 0;
630 poll_wait(filp, &file_priv->event_wait, wait);
632 if (!list_empty(&file_priv->event_list))
633 mask |= POLLIN | POLLRDNORM;
637 EXPORT_SYMBOL(drm_poll);