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_device * dev);
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 = NULL;
83 int minor_id = iminor(inode);
84 struct drm_minor *minor;
87 struct address_space *old_mapping;
88 struct address_space *old_imapping;
90 minor = idr_find(&drm_minors_idr, minor_id);
94 if (!(dev = minor->dev))
97 if (drm_device_is_unplugged(dev))
100 if (!dev->open_count++)
102 mutex_lock(&dev->struct_mutex);
103 old_imapping = inode->i_mapping;
104 old_mapping = dev->dev_mapping;
105 if (old_mapping == NULL)
106 dev->dev_mapping = &inode->i_data;
107 /* ihold ensures nobody can remove inode with our i_data */
108 ihold(container_of(dev->dev_mapping, struct inode, i_data));
109 inode->i_mapping = dev->dev_mapping;
110 filp->f_mapping = dev->dev_mapping;
111 mutex_unlock(&dev->struct_mutex);
113 retcode = drm_open_helper(inode, filp, dev);
117 retcode = drm_setup(dev);
124 mutex_lock(&dev->struct_mutex);
125 filp->f_mapping = old_imapping;
126 inode->i_mapping = old_imapping;
127 iput(container_of(dev->dev_mapping, struct inode, i_data));
128 dev->dev_mapping = old_mapping;
129 mutex_unlock(&dev->struct_mutex);
133 EXPORT_SYMBOL(drm_open);
136 * File \c open operation.
138 * \param inode device inode.
139 * \param filp file pointer.
141 * Puts the dev->fops corresponding to the device minor number into
142 * \p filp, call the \c open method, and restore the file operations.
144 int drm_stub_open(struct inode *inode, struct file *filp)
146 struct drm_device *dev = NULL;
147 struct drm_minor *minor;
148 int minor_id = iminor(inode);
150 const struct file_operations *new_fops;
154 mutex_lock(&drm_global_mutex);
155 minor = idr_find(&drm_minors_idr, minor_id);
159 if (!(dev = minor->dev))
162 if (drm_device_is_unplugged(dev))
165 new_fops = fops_get(dev->driver->fops);
169 replace_fops(filp, new_fops);
170 if (filp->f_op->open)
171 err = filp->f_op->open(inode, filp);
173 mutex_unlock(&drm_global_mutex);
178 * Check whether DRI will run on this CPU.
180 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
182 static int drm_cpu_valid(void)
184 #if defined(__i386__)
185 if (boot_cpu_data.x86 == 3)
186 return 0; /* No cmpxchg on a 386 */
188 #if defined(__sparc__) && !defined(__sparc_v9__)
189 return 0; /* No cmpxchg before v9 sparc. */
195 * Called whenever a process opens /dev/drm.
197 * \param inode device inode.
198 * \param filp file pointer.
200 * \return zero on success or a negative number on failure.
202 * Creates and initializes a drm_file structure for the file private data in \p
203 * filp and add it into the double linked list in \p dev.
205 static int drm_open_helper(struct inode *inode, struct file *filp,
206 struct drm_device * dev)
208 int minor_id = iminor(inode);
209 struct drm_file *priv;
212 if (filp->f_flags & O_EXCL)
213 return -EBUSY; /* No exclusive opens */
214 if (!drm_cpu_valid())
216 if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
219 DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);
221 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
225 filp->private_data = priv;
227 priv->uid = current_euid();
228 priv->pid = get_pid(task_pid(current));
229 priv->minor = idr_find(&drm_minors_idr, minor_id);
235 /* for compatibility root is always authenticated */
236 priv->always_authenticated = capable(CAP_SYS_ADMIN);
237 priv->authenticated = priv->always_authenticated;
238 priv->lock_count = 0;
240 INIT_LIST_HEAD(&priv->lhead);
241 INIT_LIST_HEAD(&priv->fbs);
242 mutex_init(&priv->fbs_lock);
243 INIT_LIST_HEAD(&priv->event_list);
244 init_waitqueue_head(&priv->event_wait);
245 priv->event_space = 4096; /* set aside 4k for event buffer */
247 if (dev->driver->driver_features & DRIVER_GEM)
248 drm_gem_open(dev, priv);
250 if (drm_core_check_feature(dev, DRIVER_PRIME))
251 drm_prime_init_file_private(&priv->prime);
253 if (dev->driver->open) {
254 ret = dev->driver->open(dev, priv);
256 goto out_prime_destroy;
259 /* if there is no current master make this fd it, but do not create
260 * any master object for render clients */
261 mutex_lock(&dev->struct_mutex);
262 if (!priv->minor->master && !drm_is_render_client(priv)) {
263 /* create a new master */
264 priv->minor->master = drm_master_create(priv->minor);
265 if (!priv->minor->master) {
266 mutex_unlock(&dev->struct_mutex);
272 /* take another reference for the copy in the local file priv */
273 priv->master = drm_master_get(priv->minor->master);
275 priv->authenticated = 1;
277 mutex_unlock(&dev->struct_mutex);
278 if (dev->driver->master_create) {
279 ret = dev->driver->master_create(dev, priv->master);
281 mutex_lock(&dev->struct_mutex);
282 /* drop both references if this fails */
283 drm_master_put(&priv->minor->master);
284 drm_master_put(&priv->master);
285 mutex_unlock(&dev->struct_mutex);
289 mutex_lock(&dev->struct_mutex);
290 if (dev->driver->master_set) {
291 ret = dev->driver->master_set(dev, priv, true);
293 /* drop both references if this fails */
294 drm_master_put(&priv->minor->master);
295 drm_master_put(&priv->master);
296 mutex_unlock(&dev->struct_mutex);
300 } else if (!drm_is_render_client(priv)) {
301 /* get a reference to the master */
302 priv->master = drm_master_get(priv->minor->master);
304 mutex_unlock(&dev->struct_mutex);
306 mutex_lock(&dev->struct_mutex);
307 list_add(&priv->lhead, &dev->filelist);
308 mutex_unlock(&dev->struct_mutex);
315 struct pci_dev *pci_dev;
316 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
318 dev->hose = pci_dev->sysdata;
319 pci_dev_put(pci_dev);
322 struct pci_bus *b = list_entry(pci_root_buses.next,
323 struct pci_bus, node);
325 dev->hose = b->sysdata;
333 if (dev->driver->postclose)
334 dev->driver->postclose(dev, priv);
336 if (drm_core_check_feature(dev, DRIVER_PRIME))
337 drm_prime_destroy_file_private(&priv->prime);
338 if (dev->driver->driver_features & DRIVER_GEM)
339 drm_gem_release(dev, priv);
343 filp->private_data = NULL;
347 static void drm_master_release(struct drm_device *dev, struct file *filp)
349 struct drm_file *file_priv = filp->private_data;
351 if (drm_i_have_hw_lock(dev, file_priv)) {
352 DRM_DEBUG("File %p released, freeing lock for context %d\n",
353 filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
354 drm_lock_free(&file_priv->master->lock,
355 _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
359 static void drm_events_release(struct drm_file *file_priv)
361 struct drm_device *dev = file_priv->minor->dev;
362 struct drm_pending_event *e, *et;
363 struct drm_pending_vblank_event *v, *vt;
366 spin_lock_irqsave(&dev->event_lock, flags);
368 /* Remove pending flips */
369 list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
370 if (v->base.file_priv == file_priv) {
371 list_del(&v->base.link);
372 drm_vblank_put(dev, v->pipe);
373 v->base.destroy(&v->base);
376 /* Remove unconsumed events */
377 list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
382 spin_unlock_irqrestore(&dev->event_lock, flags);
386 * drm_legacy_dev_reinit
388 * Reinitializes a legacy/ums drm device in it's lastclose function.
390 static void drm_legacy_dev_reinit(struct drm_device *dev)
392 if (drm_core_check_feature(dev, DRIVER_MODESET))
395 dev->sigdata.lock = NULL;
397 dev->context_flag = 0;
398 dev->last_context = 0;
403 * Take down the DRM device.
405 * \param dev DRM device structure.
407 * Frees every resource in \p dev.
411 int drm_lastclose(struct drm_device * dev)
413 struct drm_vma_entry *vma, *vma_temp;
417 if (dev->driver->lastclose)
418 dev->driver->lastclose(dev);
419 DRM_DEBUG("driver lastclose completed\n");
421 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
422 drm_irq_uninstall(dev);
424 mutex_lock(&dev->struct_mutex);
428 drm_legacy_sg_cleanup(dev);
430 /* Clear vma list (only built for debugging) */
431 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
432 list_del(&vma->head);
436 drm_legacy_dma_takedown(dev);
438 dev->dev_mapping = NULL;
439 mutex_unlock(&dev->struct_mutex);
441 drm_legacy_dev_reinit(dev);
443 DRM_DEBUG("lastclose completed\n");
450 * \param inode device inode
451 * \param file_priv DRM file private.
452 * \return zero on success or a negative number on failure.
454 * If the hardware lock is held then free it, and take it again for the kernel
455 * context since it's necessary to reclaim buffers. Unlink the file private
456 * data from its list and free it. Decreases the open count and if it reaches
457 * zero calls drm_lastclose().
459 int drm_release(struct inode *inode, struct file *filp)
461 struct drm_file *file_priv = filp->private_data;
462 struct drm_device *dev = file_priv->minor->dev;
465 mutex_lock(&drm_global_mutex);
467 DRM_DEBUG("open_count = %d\n", dev->open_count);
469 if (dev->driver->preclose)
470 dev->driver->preclose(dev, file_priv);
472 /* ========================================================
473 * Begin inline drm_release
476 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
477 task_pid_nr(current),
478 (long)old_encode_dev(file_priv->minor->device),
481 /* Release any auth tokens that might point to this file_priv,
482 (do that under the drm_global_mutex) */
483 if (file_priv->magic)
484 (void) drm_remove_magic(file_priv->master, file_priv->magic);
486 /* if the master has gone away we can't do anything with the lock */
487 if (file_priv->minor->master)
488 drm_master_release(dev, filp);
490 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
491 drm_core_reclaim_buffers(dev, file_priv);
493 drm_events_release(file_priv);
495 if (dev->driver->driver_features & DRIVER_MODESET)
496 drm_fb_release(file_priv);
498 if (dev->driver->driver_features & DRIVER_GEM)
499 drm_gem_release(dev, file_priv);
501 mutex_lock(&dev->ctxlist_mutex);
502 if (!list_empty(&dev->ctxlist)) {
503 struct drm_ctx_list *pos, *n;
505 list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
506 if (pos->tag == file_priv &&
507 pos->handle != DRM_KERNEL_CONTEXT) {
508 if (dev->driver->context_dtor)
509 dev->driver->context_dtor(dev,
512 drm_ctxbitmap_free(dev, pos->handle);
514 list_del(&pos->head);
519 mutex_unlock(&dev->ctxlist_mutex);
521 mutex_lock(&dev->struct_mutex);
523 if (file_priv->is_master) {
524 struct drm_master *master = file_priv->master;
525 struct drm_file *temp;
526 list_for_each_entry(temp, &dev->filelist, lhead) {
527 if ((temp->master == file_priv->master) &&
529 temp->authenticated = temp->always_authenticated;
533 * Since the master is disappearing, so is the
534 * possibility to lock.
537 if (master->lock.hw_lock) {
538 if (dev->sigdata.lock == master->lock.hw_lock)
539 dev->sigdata.lock = NULL;
540 master->lock.hw_lock = NULL;
541 master->lock.file_priv = NULL;
542 wake_up_interruptible_all(&master->lock.lock_queue);
545 if (file_priv->minor->master == file_priv->master) {
546 /* drop the reference held my the minor */
547 if (dev->driver->master_drop)
548 dev->driver->master_drop(dev, file_priv, true);
549 drm_master_put(&file_priv->minor->master);
553 BUG_ON(dev->dev_mapping == NULL);
554 iput(container_of(dev->dev_mapping, struct inode, i_data));
556 /* drop the reference held my the file priv */
557 if (file_priv->master)
558 drm_master_put(&file_priv->master);
559 file_priv->is_master = 0;
560 list_del(&file_priv->lhead);
561 mutex_unlock(&dev->struct_mutex);
563 if (dev->driver->postclose)
564 dev->driver->postclose(dev, file_priv);
567 if (drm_core_check_feature(dev, DRIVER_PRIME))
568 drm_prime_destroy_file_private(&file_priv->prime);
570 put_pid(file_priv->pid);
573 /* ========================================================
574 * End inline drm_release
577 if (!--dev->open_count) {
578 retcode = drm_lastclose(dev);
579 if (drm_device_is_unplugged(dev))
582 mutex_unlock(&drm_global_mutex);
586 EXPORT_SYMBOL(drm_release);
589 drm_dequeue_event(struct drm_file *file_priv,
590 size_t total, size_t max, struct drm_pending_event **out)
592 struct drm_device *dev = file_priv->minor->dev;
593 struct drm_pending_event *e;
597 spin_lock_irqsave(&dev->event_lock, flags);
600 if (list_empty(&file_priv->event_list))
602 e = list_first_entry(&file_priv->event_list,
603 struct drm_pending_event, link);
604 if (e->event->length + total > max)
607 file_priv->event_space += e->event->length;
613 spin_unlock_irqrestore(&dev->event_lock, flags);
617 ssize_t drm_read(struct file *filp, char __user *buffer,
618 size_t count, loff_t *offset)
620 struct drm_file *file_priv = filp->private_data;
621 struct drm_pending_event *e;
625 ret = wait_event_interruptible(file_priv->event_wait,
626 !list_empty(&file_priv->event_list));
631 while (drm_dequeue_event(file_priv, total, count, &e)) {
632 if (copy_to_user(buffer + total,
633 e->event, e->event->length)) {
638 total += e->event->length;
644 EXPORT_SYMBOL(drm_read);
646 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
648 struct drm_file *file_priv = filp->private_data;
649 unsigned int mask = 0;
651 poll_wait(filp, &file_priv->event_wait, wait);
653 if (!list_empty(&file_priv->event_list))
654 mask |= POLLIN | POLLRDNORM;
658 EXPORT_SYMBOL(drm_poll);