include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-3.10.git] / drivers / gpu / drm / drm_fops.c
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 <linux/poll.h>
39 #include <linux/slab.h>
40 #include <linux/smp_lock.h>
41
42 static int drm_open_helper(struct inode *inode, struct file *filp,
43                            struct drm_device * dev);
44
45 static int drm_setup(struct drm_device * dev)
46 {
47         int i;
48         int ret;
49
50         if (dev->driver->firstopen) {
51                 ret = dev->driver->firstopen(dev);
52                 if (ret != 0)
53                         return ret;
54         }
55
56         atomic_set(&dev->ioctl_count, 0);
57         atomic_set(&dev->vma_count, 0);
58
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);
63
64                 i = drm_dma_setup(dev);
65                 if (i < 0)
66                         return i;
67         }
68
69         for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
70                 atomic_set(&dev->counts[i], 0);
71
72         dev->sigdata.lock = NULL;
73
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;
86
87         dev->ctx_start = 0;
88         dev->lck_start = 0;
89
90         dev->buf_async = NULL;
91         init_waitqueue_head(&dev->buf_readers);
92         init_waitqueue_head(&dev->buf_writers);
93
94         DRM_DEBUG("\n");
95
96         /*
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.
102          */
103
104         return 0;
105 }
106
107 /**
108  * Open file.
109  *
110  * \param inode device inode
111  * \param filp file pointer.
112  * \return zero on success or a negative number on failure.
113  *
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().
117  */
118 int drm_open(struct inode *inode, struct file *filp)
119 {
120         struct drm_device *dev = NULL;
121         int minor_id = iminor(inode);
122         struct drm_minor *minor;
123         int retcode = 0;
124
125         minor = idr_find(&drm_minors_idr, minor_id);
126         if (!minor)
127                 return -ENODEV;
128
129         if (!(dev = minor->dev))
130                 return -ENODEV;
131
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;
140                 }
141                 spin_unlock(&dev->count_lock);
142         }
143 out:
144         mutex_lock(&dev->struct_mutex);
145         if (minor->type == DRM_MINOR_LEGACY) {
146                 BUG_ON((dev->dev_mapping != NULL) &&
147                         (dev->dev_mapping != inode->i_mapping));
148                 if (dev->dev_mapping == NULL)
149                         dev->dev_mapping = inode->i_mapping;
150         }
151         mutex_unlock(&dev->struct_mutex);
152
153         return retcode;
154 }
155 EXPORT_SYMBOL(drm_open);
156
157 /**
158  * File \c open operation.
159  *
160  * \param inode device inode.
161  * \param filp file pointer.
162  *
163  * Puts the dev->fops corresponding to the device minor number into
164  * \p filp, call the \c open method, and restore the file operations.
165  */
166 int drm_stub_open(struct inode *inode, struct file *filp)
167 {
168         struct drm_device *dev = NULL;
169         struct drm_minor *minor;
170         int minor_id = iminor(inode);
171         int err = -ENODEV;
172         const struct file_operations *old_fops;
173
174         DRM_DEBUG("\n");
175
176         /* BKL pushdown: note that nothing else serializes idr_find() */
177         lock_kernel();
178         minor = idr_find(&drm_minors_idr, minor_id);
179         if (!minor)
180                 goto out;
181
182         if (!(dev = minor->dev))
183                 goto out;
184
185         old_fops = filp->f_op;
186         filp->f_op = fops_get(&dev->driver->fops);
187         if (filp->f_op == NULL) {
188                 filp->f_op = old_fops;
189                 goto out;
190         }
191         if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
192                 fops_put(filp->f_op);
193                 filp->f_op = fops_get(old_fops);
194         }
195         fops_put(old_fops);
196
197 out:
198         unlock_kernel();
199         return err;
200 }
201
202 /**
203  * Check whether DRI will run on this CPU.
204  *
205  * \return non-zero if the DRI will run on this CPU, or zero otherwise.
206  */
207 static int drm_cpu_valid(void)
208 {
209 #if defined(__i386__)
210         if (boot_cpu_data.x86 == 3)
211                 return 0;       /* No cmpxchg on a 386 */
212 #endif
213 #if defined(__sparc__) && !defined(__sparc_v9__)
214         return 0;               /* No cmpxchg before v9 sparc. */
215 #endif
216         return 1;
217 }
218
219 /**
220  * Called whenever a process opens /dev/drm.
221  *
222  * \param inode device inode.
223  * \param filp file pointer.
224  * \param dev device.
225  * \return zero on success or a negative number on failure.
226  *
227  * Creates and initializes a drm_file structure for the file private data in \p
228  * filp and add it into the double linked list in \p dev.
229  */
230 static int drm_open_helper(struct inode *inode, struct file *filp,
231                            struct drm_device * dev)
232 {
233         int minor_id = iminor(inode);
234         struct drm_file *priv;
235         int ret;
236
237         if (filp->f_flags & O_EXCL)
238                 return -EBUSY;  /* No exclusive opens */
239         if (!drm_cpu_valid())
240                 return -EINVAL;
241
242         DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);
243
244         priv = kmalloc(sizeof(*priv), GFP_KERNEL);
245         if (!priv)
246                 return -ENOMEM;
247
248         memset(priv, 0, sizeof(*priv));
249         filp->private_data = priv;
250         priv->filp = filp;
251         priv->uid = current_euid();
252         priv->pid = task_pid_nr(current);
253         priv->minor = idr_find(&drm_minors_idr, minor_id);
254         priv->ioctl_count = 0;
255         /* for compatibility root is always authenticated */
256         priv->authenticated = capable(CAP_SYS_ADMIN);
257         priv->lock_count = 0;
258
259         INIT_LIST_HEAD(&priv->lhead);
260         INIT_LIST_HEAD(&priv->fbs);
261         INIT_LIST_HEAD(&priv->event_list);
262         init_waitqueue_head(&priv->event_wait);
263         priv->event_space = 4096; /* set aside 4k for event buffer */
264
265         if (dev->driver->driver_features & DRIVER_GEM)
266                 drm_gem_open(dev, priv);
267
268         if (dev->driver->open) {
269                 ret = dev->driver->open(dev, priv);
270                 if (ret < 0)
271                         goto out_free;
272         }
273
274
275         /* if there is no current master make this fd it */
276         mutex_lock(&dev->struct_mutex);
277         if (!priv->minor->master) {
278                 /* create a new master */
279                 priv->minor->master = drm_master_create(priv->minor);
280                 if (!priv->minor->master) {
281                         mutex_unlock(&dev->struct_mutex);
282                         ret = -ENOMEM;
283                         goto out_free;
284                 }
285
286                 priv->is_master = 1;
287                 /* take another reference for the copy in the local file priv */
288                 priv->master = drm_master_get(priv->minor->master);
289
290                 priv->authenticated = 1;
291
292                 mutex_unlock(&dev->struct_mutex);
293                 if (dev->driver->master_create) {
294                         ret = dev->driver->master_create(dev, priv->master);
295                         if (ret) {
296                                 mutex_lock(&dev->struct_mutex);
297                                 /* drop both references if this fails */
298                                 drm_master_put(&priv->minor->master);
299                                 drm_master_put(&priv->master);
300                                 mutex_unlock(&dev->struct_mutex);
301                                 goto out_free;
302                         }
303                 }
304                 mutex_lock(&dev->struct_mutex);
305                 if (dev->driver->master_set) {
306                         ret = dev->driver->master_set(dev, priv, true);
307                         if (ret) {
308                                 /* drop both references if this fails */
309                                 drm_master_put(&priv->minor->master);
310                                 drm_master_put(&priv->master);
311                                 mutex_unlock(&dev->struct_mutex);
312                                 goto out_free;
313                         }
314                 }
315                 mutex_unlock(&dev->struct_mutex);
316         } else {
317                 /* get a reference to the master */
318                 priv->master = drm_master_get(priv->minor->master);
319                 mutex_unlock(&dev->struct_mutex);
320         }
321
322         mutex_lock(&dev->struct_mutex);
323         list_add(&priv->lhead, &dev->filelist);
324         mutex_unlock(&dev->struct_mutex);
325
326 #ifdef __alpha__
327         /*
328          * Default the hose
329          */
330         if (!dev->hose) {
331                 struct pci_dev *pci_dev;
332                 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
333                 if (pci_dev) {
334                         dev->hose = pci_dev->sysdata;
335                         pci_dev_put(pci_dev);
336                 }
337                 if (!dev->hose) {
338                         struct pci_bus *b = pci_bus_b(pci_root_buses.next);
339                         if (b)
340                                 dev->hose = b->sysdata;
341                 }
342         }
343 #endif
344
345         return 0;
346       out_free:
347         kfree(priv);
348         filp->private_data = NULL;
349         return ret;
350 }
351
352 /** No-op. */
353 int drm_fasync(int fd, struct file *filp, int on)
354 {
355         struct drm_file *priv = filp->private_data;
356         struct drm_device *dev = priv->minor->dev;
357
358         DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
359                   (long)old_encode_dev(priv->minor->device));
360         return fasync_helper(fd, filp, on, &dev->buf_async);
361 }
362 EXPORT_SYMBOL(drm_fasync);
363
364 /*
365  * Reclaim locked buffers; note that this may be a bad idea if the current
366  * context doesn't have the hw lock...
367  */
368 static void drm_reclaim_locked_buffers(struct drm_device *dev, struct file *f)
369 {
370         struct drm_file *file_priv = f->private_data;
371
372         if (drm_i_have_hw_lock(dev, file_priv)) {
373                 dev->driver->reclaim_buffers_locked(dev, file_priv);
374         } else {
375                 unsigned long _end = jiffies + 3 * DRM_HZ;
376                 int locked = 0;
377
378                 drm_idlelock_take(&file_priv->master->lock);
379
380                 /*
381                  * Wait for a while.
382                  */
383                 do {
384                         spin_lock_bh(&file_priv->master->lock.spinlock);
385                         locked = file_priv->master->lock.idle_has_lock;
386                         spin_unlock_bh(&file_priv->master->lock.spinlock);
387                         if (locked)
388                                 break;
389                         schedule();
390                 } while (!time_after_eq(jiffies, _end));
391
392                 if (!locked) {
393                         DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
394                                   "\tdriver to use reclaim_buffers_idlelocked() instead.\n"
395                                   "\tI will go on reclaiming the buffers anyway.\n");
396                 }
397
398                 dev->driver->reclaim_buffers_locked(dev, file_priv);
399                 drm_idlelock_release(&file_priv->master->lock);
400         }
401 }
402
403 static void drm_master_release(struct drm_device *dev, struct file *filp)
404 {
405         struct drm_file *file_priv = filp->private_data;
406
407         if (dev->driver->reclaim_buffers_locked &&
408             file_priv->master->lock.hw_lock)
409                 drm_reclaim_locked_buffers(dev, filp);
410
411         if (dev->driver->reclaim_buffers_idlelocked &&
412             file_priv->master->lock.hw_lock) {
413                 drm_idlelock_take(&file_priv->master->lock);
414                 dev->driver->reclaim_buffers_idlelocked(dev, file_priv);
415                 drm_idlelock_release(&file_priv->master->lock);
416         }
417
418
419         if (drm_i_have_hw_lock(dev, file_priv)) {
420                 DRM_DEBUG("File %p released, freeing lock for context %d\n",
421                           filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
422                 drm_lock_free(&file_priv->master->lock,
423                               _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
424         }
425
426         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
427             !dev->driver->reclaim_buffers_locked) {
428                 dev->driver->reclaim_buffers(dev, file_priv);
429         }
430 }
431
432 static void drm_events_release(struct drm_file *file_priv)
433 {
434         struct drm_device *dev = file_priv->minor->dev;
435         struct drm_pending_event *e, *et;
436         struct drm_pending_vblank_event *v, *vt;
437         unsigned long flags;
438
439         spin_lock_irqsave(&dev->event_lock, flags);
440
441         /* Remove pending flips */
442         list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
443                 if (v->base.file_priv == file_priv) {
444                         list_del(&v->base.link);
445                         drm_vblank_put(dev, v->pipe);
446                         v->base.destroy(&v->base);
447                 }
448
449         /* Remove unconsumed events */
450         list_for_each_entry_safe(e, et, &file_priv->event_list, link)
451                 e->destroy(e);
452
453         spin_unlock_irqrestore(&dev->event_lock, flags);
454 }
455
456 /**
457  * Release file.
458  *
459  * \param inode device inode
460  * \param file_priv DRM file private.
461  * \return zero on success or a negative number on failure.
462  *
463  * If the hardware lock is held then free it, and take it again for the kernel
464  * context since it's necessary to reclaim buffers. Unlink the file private
465  * data from its list and free it. Decreases the open count and if it reaches
466  * zero calls drm_lastclose().
467  */
468 int drm_release(struct inode *inode, struct file *filp)
469 {
470         struct drm_file *file_priv = filp->private_data;
471         struct drm_device *dev = file_priv->minor->dev;
472         int retcode = 0;
473
474         lock_kernel();
475
476         DRM_DEBUG("open_count = %d\n", dev->open_count);
477
478         if (dev->driver->preclose)
479                 dev->driver->preclose(dev, file_priv);
480
481         /* ========================================================
482          * Begin inline drm_release
483          */
484
485         DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
486                   task_pid_nr(current),
487                   (long)old_encode_dev(file_priv->minor->device),
488                   dev->open_count);
489
490         /* if the master has gone away we can't do anything with the lock */
491         if (file_priv->minor->master)
492                 drm_master_release(dev, filp);
493
494         drm_events_release(file_priv);
495
496         if (dev->driver->driver_features & DRIVER_GEM)
497                 drm_gem_release(dev, file_priv);
498
499         if (dev->driver->driver_features & DRIVER_MODESET)
500                 drm_fb_release(file_priv);
501
502         mutex_lock(&dev->ctxlist_mutex);
503         if (!list_empty(&dev->ctxlist)) {
504                 struct drm_ctx_list *pos, *n;
505
506                 list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
507                         if (pos->tag == file_priv &&
508                             pos->handle != DRM_KERNEL_CONTEXT) {
509                                 if (dev->driver->context_dtor)
510                                         dev->driver->context_dtor(dev,
511                                                                   pos->handle);
512
513                                 drm_ctxbitmap_free(dev, pos->handle);
514
515                                 list_del(&pos->head);
516                                 kfree(pos);
517                                 --dev->ctx_count;
518                         }
519                 }
520         }
521         mutex_unlock(&dev->ctxlist_mutex);
522
523         mutex_lock(&dev->struct_mutex);
524
525         if (file_priv->is_master) {
526                 struct drm_master *master = file_priv->master;
527                 struct drm_file *temp;
528                 list_for_each_entry(temp, &dev->filelist, lhead) {
529                         if ((temp->master == file_priv->master) &&
530                             (temp != file_priv))
531                                 temp->authenticated = 0;
532                 }
533
534                 /**
535                  * Since the master is disappearing, so is the
536                  * possibility to lock.
537                  */
538
539                 if (master->lock.hw_lock) {
540                         if (dev->sigdata.lock == master->lock.hw_lock)
541                                 dev->sigdata.lock = NULL;
542                         master->lock.hw_lock = NULL;
543                         master->lock.file_priv = NULL;
544                         wake_up_interruptible_all(&master->lock.lock_queue);
545                 }
546
547                 if (file_priv->minor->master == file_priv->master) {
548                         /* drop the reference held my the minor */
549                         if (dev->driver->master_drop)
550                                 dev->driver->master_drop(dev, file_priv, true);
551                         drm_master_put(&file_priv->minor->master);
552                 }
553         }
554
555         /* drop the reference held my the file priv */
556         drm_master_put(&file_priv->master);
557         file_priv->is_master = 0;
558         list_del(&file_priv->lhead);
559         mutex_unlock(&dev->struct_mutex);
560
561         if (dev->driver->postclose)
562                 dev->driver->postclose(dev, file_priv);
563         kfree(file_priv);
564
565         /* ========================================================
566          * End inline drm_release
567          */
568
569         atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
570         spin_lock(&dev->count_lock);
571         if (!--dev->open_count) {
572                 if (atomic_read(&dev->ioctl_count)) {
573                         DRM_ERROR("Device busy: %d\n",
574                                   atomic_read(&dev->ioctl_count));
575                         spin_unlock(&dev->count_lock);
576                         unlock_kernel();
577                         return -EBUSY;
578                 }
579                 spin_unlock(&dev->count_lock);
580                 unlock_kernel();
581                 return drm_lastclose(dev);
582         }
583         spin_unlock(&dev->count_lock);
584
585         unlock_kernel();
586
587         return retcode;
588 }
589 EXPORT_SYMBOL(drm_release);
590
591 static bool
592 drm_dequeue_event(struct drm_file *file_priv,
593                   size_t total, size_t max, struct drm_pending_event **out)
594 {
595         struct drm_device *dev = file_priv->minor->dev;
596         struct drm_pending_event *e;
597         unsigned long flags;
598         bool ret = false;
599
600         spin_lock_irqsave(&dev->event_lock, flags);
601
602         *out = NULL;
603         if (list_empty(&file_priv->event_list))
604                 goto out;
605         e = list_first_entry(&file_priv->event_list,
606                              struct drm_pending_event, link);
607         if (e->event->length + total > max)
608                 goto out;
609
610         file_priv->event_space += e->event->length;
611         list_del(&e->link);
612         *out = e;
613         ret = true;
614
615 out:
616         spin_unlock_irqrestore(&dev->event_lock, flags);
617         return ret;
618 }
619
620 ssize_t drm_read(struct file *filp, char __user *buffer,
621                  size_t count, loff_t *offset)
622 {
623         struct drm_file *file_priv = filp->private_data;
624         struct drm_pending_event *e;
625         size_t total;
626         ssize_t ret;
627
628         ret = wait_event_interruptible(file_priv->event_wait,
629                                        !list_empty(&file_priv->event_list));
630         if (ret < 0)
631                 return ret;
632
633         total = 0;
634         while (drm_dequeue_event(file_priv, total, count, &e)) {
635                 if (copy_to_user(buffer + total,
636                                  e->event, e->event->length)) {
637                         total = -EFAULT;
638                         break;
639                 }
640
641                 total += e->event->length;
642                 e->destroy(e);
643         }
644
645         return total;
646 }
647 EXPORT_SYMBOL(drm_read);
648
649 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
650 {
651         struct drm_file *file_priv = filp->private_data;
652         unsigned int mask = 0;
653
654         poll_wait(filp, &file_priv->event_wait, wait);
655
656         if (!list_empty(&file_priv->event_list))
657                 mask |= POLLIN | POLLRDNORM;
658
659         return mask;
660 }
661 EXPORT_SYMBOL(drm_poll);