Staging: strip: delete the driver
[linux/fpc-iii.git] / drivers / gpu / drm / drm_fops.c
blob9d532d7fdf59a8e551233c1c44ef730eb22778ca
1 /**
2 * \file drm_fops.c
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>
8 */
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
26 * Software.
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.
37 #include "drmP.h"
38 #include <linux/poll.h>
39 #include <linux/slab.h>
40 #include <linux/smp_lock.h>
42 static int drm_open_helper(struct inode *inode, struct file *filp,
43 struct drm_device * dev);
45 static int drm_setup(struct drm_device * dev)
47 int i;
48 int ret;
50 if (dev->driver->firstopen) {
51 ret = dev->driver->firstopen(dev);
52 if (ret != 0)
53 return ret;
56 atomic_set(&dev->ioctl_count, 0);
57 atomic_set(&dev->vma_count, 0);
59 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
60 !drm_core_check_feature(dev, DRIVER_MODESET)) {
61 dev->buf_use = 0;
62 atomic_set(&dev->buf_alloc, 0);
64 i = drm_dma_setup(dev);
65 if (i < 0)
66 return i;
69 for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
70 atomic_set(&dev->counts[i], 0);
72 dev->sigdata.lock = NULL;
74 dev->queue_count = 0;
75 dev->queue_reserved = 0;
76 dev->queue_slots = 0;
77 dev->queuelist = NULL;
78 dev->context_flag = 0;
79 dev->interrupt_flag = 0;
80 dev->dma_flag = 0;
81 dev->last_context = 0;
82 dev->last_switch = 0;
83 dev->last_checked = 0;
84 init_waitqueue_head(&dev->context_wait);
85 dev->if_version = 0;
87 dev->ctx_start = 0;
88 dev->lck_start = 0;
90 dev->buf_async = NULL;
91 init_waitqueue_head(&dev->buf_readers);
92 init_waitqueue_head(&dev->buf_writers);
94 DRM_DEBUG("\n");
97 * The kernel's context could be created here, but is now created
98 * in drm_dma_enqueue. This is more resource-efficient for
99 * hardware that does not do DMA, but may mean that
100 * drm_select_queue fails between the time the interrupt is
101 * initialized and the time the queues are initialized.
104 return 0;
108 * Open file.
110 * \param inode device inode
111 * \param filp file pointer.
112 * \return zero on success or a negative number on failure.
114 * Searches the DRM device with the same minor number, calls open_helper(), and
115 * increments the device open count. If the open count was previous at zero,
116 * i.e., it's the first that the device is open, then calls setup().
118 int drm_open(struct inode *inode, struct file *filp)
120 struct drm_device *dev = NULL;
121 int minor_id = iminor(inode);
122 struct drm_minor *minor;
123 int retcode = 0;
125 minor = idr_find(&drm_minors_idr, minor_id);
126 if (!minor)
127 return -ENODEV;
129 if (!(dev = minor->dev))
130 return -ENODEV;
132 retcode = drm_open_helper(inode, filp, dev);
133 if (!retcode) {
134 atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
135 spin_lock(&dev->count_lock);
136 if (!dev->open_count++) {
137 spin_unlock(&dev->count_lock);
138 retcode = drm_setup(dev);
139 goto out;
141 spin_unlock(&dev->count_lock);
143 out:
144 if (!retcode) {
145 mutex_lock(&dev->struct_mutex);
146 if (minor->type == DRM_MINOR_LEGACY) {
147 if (dev->dev_mapping == NULL)
148 dev->dev_mapping = inode->i_mapping;
149 else if (dev->dev_mapping != inode->i_mapping)
150 retcode = -ENODEV;
152 mutex_unlock(&dev->struct_mutex);
155 return retcode;
157 EXPORT_SYMBOL(drm_open);
160 * File \c open operation.
162 * \param inode device inode.
163 * \param filp file pointer.
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.
168 int drm_stub_open(struct inode *inode, struct file *filp)
170 struct drm_device *dev = NULL;
171 struct drm_minor *minor;
172 int minor_id = iminor(inode);
173 int err = -ENODEV;
174 const struct file_operations *old_fops;
176 DRM_DEBUG("\n");
178 /* BKL pushdown: note that nothing else serializes idr_find() */
179 lock_kernel();
180 minor = idr_find(&drm_minors_idr, minor_id);
181 if (!minor)
182 goto out;
184 if (!(dev = minor->dev))
185 goto out;
187 old_fops = filp->f_op;
188 filp->f_op = fops_get(&dev->driver->fops);
189 if (filp->f_op == NULL) {
190 filp->f_op = old_fops;
191 goto out;
193 if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
194 fops_put(filp->f_op);
195 filp->f_op = fops_get(old_fops);
197 fops_put(old_fops);
199 out:
200 unlock_kernel();
201 return err;
205 * Check whether DRI will run on this CPU.
207 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
209 static int drm_cpu_valid(void)
211 #if defined(__i386__)
212 if (boot_cpu_data.x86 == 3)
213 return 0; /* No cmpxchg on a 386 */
214 #endif
215 #if defined(__sparc__) && !defined(__sparc_v9__)
216 return 0; /* No cmpxchg before v9 sparc. */
217 #endif
218 return 1;
222 * Called whenever a process opens /dev/drm.
224 * \param inode device inode.
225 * \param filp file pointer.
226 * \param dev device.
227 * \return zero on success or a negative number on failure.
229 * Creates and initializes a drm_file structure for the file private data in \p
230 * filp and add it into the double linked list in \p dev.
232 static int drm_open_helper(struct inode *inode, struct file *filp,
233 struct drm_device * dev)
235 int minor_id = iminor(inode);
236 struct drm_file *priv;
237 int ret;
239 if (filp->f_flags & O_EXCL)
240 return -EBUSY; /* No exclusive opens */
241 if (!drm_cpu_valid())
242 return -EINVAL;
244 DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);
246 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
247 if (!priv)
248 return -ENOMEM;
250 memset(priv, 0, sizeof(*priv));
251 filp->private_data = priv;
252 priv->filp = filp;
253 priv->uid = current_euid();
254 priv->pid = task_pid_nr(current);
255 priv->minor = idr_find(&drm_minors_idr, minor_id);
256 priv->ioctl_count = 0;
257 /* for compatibility root is always authenticated */
258 priv->authenticated = capable(CAP_SYS_ADMIN);
259 priv->lock_count = 0;
261 INIT_LIST_HEAD(&priv->lhead);
262 INIT_LIST_HEAD(&priv->fbs);
263 INIT_LIST_HEAD(&priv->event_list);
264 init_waitqueue_head(&priv->event_wait);
265 priv->event_space = 4096; /* set aside 4k for event buffer */
267 if (dev->driver->driver_features & DRIVER_GEM)
268 drm_gem_open(dev, priv);
270 if (dev->driver->open) {
271 ret = dev->driver->open(dev, priv);
272 if (ret < 0)
273 goto out_free;
277 /* if there is no current master make this fd it */
278 mutex_lock(&dev->struct_mutex);
279 if (!priv->minor->master) {
280 /* create a new master */
281 priv->minor->master = drm_master_create(priv->minor);
282 if (!priv->minor->master) {
283 mutex_unlock(&dev->struct_mutex);
284 ret = -ENOMEM;
285 goto out_free;
288 priv->is_master = 1;
289 /* take another reference for the copy in the local file priv */
290 priv->master = drm_master_get(priv->minor->master);
292 priv->authenticated = 1;
294 mutex_unlock(&dev->struct_mutex);
295 if (dev->driver->master_create) {
296 ret = dev->driver->master_create(dev, priv->master);
297 if (ret) {
298 mutex_lock(&dev->struct_mutex);
299 /* drop both references if this fails */
300 drm_master_put(&priv->minor->master);
301 drm_master_put(&priv->master);
302 mutex_unlock(&dev->struct_mutex);
303 goto out_free;
306 mutex_lock(&dev->struct_mutex);
307 if (dev->driver->master_set) {
308 ret = dev->driver->master_set(dev, priv, true);
309 if (ret) {
310 /* drop both references if this fails */
311 drm_master_put(&priv->minor->master);
312 drm_master_put(&priv->master);
313 mutex_unlock(&dev->struct_mutex);
314 goto out_free;
317 mutex_unlock(&dev->struct_mutex);
318 } else {
319 /* get a reference to the master */
320 priv->master = drm_master_get(priv->minor->master);
321 mutex_unlock(&dev->struct_mutex);
324 mutex_lock(&dev->struct_mutex);
325 list_add(&priv->lhead, &dev->filelist);
326 mutex_unlock(&dev->struct_mutex);
328 #ifdef __alpha__
330 * Default the hose
332 if (!dev->hose) {
333 struct pci_dev *pci_dev;
334 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
335 if (pci_dev) {
336 dev->hose = pci_dev->sysdata;
337 pci_dev_put(pci_dev);
339 if (!dev->hose) {
340 struct pci_bus *b = pci_bus_b(pci_root_buses.next);
341 if (b)
342 dev->hose = b->sysdata;
345 #endif
347 return 0;
348 out_free:
349 kfree(priv);
350 filp->private_data = NULL;
351 return ret;
354 /** No-op. */
355 int drm_fasync(int fd, struct file *filp, int on)
357 struct drm_file *priv = filp->private_data;
358 struct drm_device *dev = priv->minor->dev;
360 DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
361 (long)old_encode_dev(priv->minor->device));
362 return fasync_helper(fd, filp, on, &dev->buf_async);
364 EXPORT_SYMBOL(drm_fasync);
367 * Reclaim locked buffers; note that this may be a bad idea if the current
368 * context doesn't have the hw lock...
370 static void drm_reclaim_locked_buffers(struct drm_device *dev, struct file *f)
372 struct drm_file *file_priv = f->private_data;
374 if (drm_i_have_hw_lock(dev, file_priv)) {
375 dev->driver->reclaim_buffers_locked(dev, file_priv);
376 } else {
377 unsigned long _end = jiffies + 3 * DRM_HZ;
378 int locked = 0;
380 drm_idlelock_take(&file_priv->master->lock);
383 * Wait for a while.
385 do {
386 spin_lock_bh(&file_priv->master->lock.spinlock);
387 locked = file_priv->master->lock.idle_has_lock;
388 spin_unlock_bh(&file_priv->master->lock.spinlock);
389 if (locked)
390 break;
391 schedule();
392 } while (!time_after_eq(jiffies, _end));
394 if (!locked) {
395 DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
396 "\tdriver to use reclaim_buffers_idlelocked() instead.\n"
397 "\tI will go on reclaiming the buffers anyway.\n");
400 dev->driver->reclaim_buffers_locked(dev, file_priv);
401 drm_idlelock_release(&file_priv->master->lock);
405 static void drm_master_release(struct drm_device *dev, struct file *filp)
407 struct drm_file *file_priv = filp->private_data;
409 if (dev->driver->reclaim_buffers_locked &&
410 file_priv->master->lock.hw_lock)
411 drm_reclaim_locked_buffers(dev, filp);
413 if (dev->driver->reclaim_buffers_idlelocked &&
414 file_priv->master->lock.hw_lock) {
415 drm_idlelock_take(&file_priv->master->lock);
416 dev->driver->reclaim_buffers_idlelocked(dev, file_priv);
417 drm_idlelock_release(&file_priv->master->lock);
421 if (drm_i_have_hw_lock(dev, file_priv)) {
422 DRM_DEBUG("File %p released, freeing lock for context %d\n",
423 filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
424 drm_lock_free(&file_priv->master->lock,
425 _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
428 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
429 !dev->driver->reclaim_buffers_locked) {
430 dev->driver->reclaim_buffers(dev, file_priv);
434 static void drm_events_release(struct drm_file *file_priv)
436 struct drm_device *dev = file_priv->minor->dev;
437 struct drm_pending_event *e, *et;
438 struct drm_pending_vblank_event *v, *vt;
439 unsigned long flags;
441 spin_lock_irqsave(&dev->event_lock, flags);
443 /* Remove pending flips */
444 list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
445 if (v->base.file_priv == file_priv) {
446 list_del(&v->base.link);
447 drm_vblank_put(dev, v->pipe);
448 v->base.destroy(&v->base);
451 /* Remove unconsumed events */
452 list_for_each_entry_safe(e, et, &file_priv->event_list, link)
453 e->destroy(e);
455 spin_unlock_irqrestore(&dev->event_lock, flags);
459 * Release file.
461 * \param inode device inode
462 * \param file_priv DRM file private.
463 * \return zero on success or a negative number on failure.
465 * If the hardware lock is held then free it, and take it again for the kernel
466 * context since it's necessary to reclaim buffers. Unlink the file private
467 * data from its list and free it. Decreases the open count and if it reaches
468 * zero calls drm_lastclose().
470 int drm_release(struct inode *inode, struct file *filp)
472 struct drm_file *file_priv = filp->private_data;
473 struct drm_device *dev = file_priv->minor->dev;
474 int retcode = 0;
476 lock_kernel();
478 DRM_DEBUG("open_count = %d\n", dev->open_count);
480 if (dev->driver->preclose)
481 dev->driver->preclose(dev, file_priv);
483 /* ========================================================
484 * Begin inline drm_release
487 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
488 task_pid_nr(current),
489 (long)old_encode_dev(file_priv->minor->device),
490 dev->open_count);
492 /* if the master has gone away we can't do anything with the lock */
493 if (file_priv->minor->master)
494 drm_master_release(dev, filp);
496 drm_events_release(file_priv);
498 if (dev->driver->driver_features & DRIVER_GEM)
499 drm_gem_release(dev, file_priv);
501 if (dev->driver->driver_features & DRIVER_MODESET)
502 drm_fb_release(file_priv);
504 mutex_lock(&dev->ctxlist_mutex);
505 if (!list_empty(&dev->ctxlist)) {
506 struct drm_ctx_list *pos, *n;
508 list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
509 if (pos->tag == file_priv &&
510 pos->handle != DRM_KERNEL_CONTEXT) {
511 if (dev->driver->context_dtor)
512 dev->driver->context_dtor(dev,
513 pos->handle);
515 drm_ctxbitmap_free(dev, pos->handle);
517 list_del(&pos->head);
518 kfree(pos);
519 --dev->ctx_count;
523 mutex_unlock(&dev->ctxlist_mutex);
525 mutex_lock(&dev->struct_mutex);
527 if (file_priv->is_master) {
528 struct drm_master *master = file_priv->master;
529 struct drm_file *temp;
530 list_for_each_entry(temp, &dev->filelist, lhead) {
531 if ((temp->master == file_priv->master) &&
532 (temp != file_priv))
533 temp->authenticated = 0;
537 * Since the master is disappearing, so is the
538 * possibility to lock.
541 if (master->lock.hw_lock) {
542 if (dev->sigdata.lock == master->lock.hw_lock)
543 dev->sigdata.lock = NULL;
544 master->lock.hw_lock = NULL;
545 master->lock.file_priv = NULL;
546 wake_up_interruptible_all(&master->lock.lock_queue);
549 if (file_priv->minor->master == file_priv->master) {
550 /* drop the reference held my the minor */
551 if (dev->driver->master_drop)
552 dev->driver->master_drop(dev, file_priv, true);
553 drm_master_put(&file_priv->minor->master);
557 /* drop the reference held my the file priv */
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);
565 kfree(file_priv);
567 /* ========================================================
568 * End inline drm_release
571 atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
572 spin_lock(&dev->count_lock);
573 if (!--dev->open_count) {
574 if (atomic_read(&dev->ioctl_count)) {
575 DRM_ERROR("Device busy: %d\n",
576 atomic_read(&dev->ioctl_count));
577 spin_unlock(&dev->count_lock);
578 unlock_kernel();
579 return -EBUSY;
581 spin_unlock(&dev->count_lock);
582 unlock_kernel();
583 return drm_lastclose(dev);
585 spin_unlock(&dev->count_lock);
587 unlock_kernel();
589 return retcode;
591 EXPORT_SYMBOL(drm_release);
593 static bool
594 drm_dequeue_event(struct drm_file *file_priv,
595 size_t total, size_t max, struct drm_pending_event **out)
597 struct drm_device *dev = file_priv->minor->dev;
598 struct drm_pending_event *e;
599 unsigned long flags;
600 bool ret = false;
602 spin_lock_irqsave(&dev->event_lock, flags);
604 *out = NULL;
605 if (list_empty(&file_priv->event_list))
606 goto out;
607 e = list_first_entry(&file_priv->event_list,
608 struct drm_pending_event, link);
609 if (e->event->length + total > max)
610 goto out;
612 file_priv->event_space += e->event->length;
613 list_del(&e->link);
614 *out = e;
615 ret = true;
617 out:
618 spin_unlock_irqrestore(&dev->event_lock, flags);
619 return ret;
622 ssize_t drm_read(struct file *filp, char __user *buffer,
623 size_t count, loff_t *offset)
625 struct drm_file *file_priv = filp->private_data;
626 struct drm_pending_event *e;
627 size_t total;
628 ssize_t ret;
630 ret = wait_event_interruptible(file_priv->event_wait,
631 !list_empty(&file_priv->event_list));
632 if (ret < 0)
633 return ret;
635 total = 0;
636 while (drm_dequeue_event(file_priv, total, count, &e)) {
637 if (copy_to_user(buffer + total,
638 e->event, e->event->length)) {
639 total = -EFAULT;
640 break;
643 total += e->event->length;
644 e->destroy(e);
647 return total;
649 EXPORT_SYMBOL(drm_read);
651 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
653 struct drm_file *file_priv = filp->private_data;
654 unsigned int mask = 0;
656 poll_wait(filp, &file_priv->event_wait, wait);
658 if (!list_empty(&file_priv->event_list))
659 mask |= POLLIN | POLLRDNORM;
661 return mask;
663 EXPORT_SYMBOL(drm_poll);