drm/radeon: include radeon_asic.h in the asic specific files
[linux-2.6.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/smp_lock.h>
40
41 static int drm_open_helper(struct inode *inode, struct file *filp,
42                            struct drm_device * dev);
43
44 static int drm_setup(struct drm_device * dev)
45 {
46         int i;
47         int ret;
48
49         if (dev->driver->firstopen) {
50                 ret = dev->driver->firstopen(dev);
51                 if (ret != 0)
52                         return ret;
53         }
54
55         atomic_set(&dev->ioctl_count, 0);
56         atomic_set(&dev->vma_count, 0);
57
58         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
59             !drm_core_check_feature(dev, DRIVER_MODESET)) {
60                 dev->buf_use = 0;
61                 atomic_set(&dev->buf_alloc, 0);
62
63                 i = drm_dma_setup(dev);
64                 if (i < 0)
65                         return i;
66         }
67
68         for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
69                 atomic_set(&dev->counts[i], 0);
70
71         dev->sigdata.lock = NULL;
72
73         dev->queue_count = 0;
74         dev->queue_reserved = 0;
75         dev->queue_slots = 0;
76         dev->queuelist = NULL;
77         dev->context_flag = 0;
78         dev->interrupt_flag = 0;
79         dev->dma_flag = 0;
80         dev->last_context = 0;
81         dev->last_switch = 0;
82         dev->last_checked = 0;
83         init_waitqueue_head(&dev->context_wait);
84         dev->if_version = 0;
85
86         dev->ctx_start = 0;
87         dev->lck_start = 0;
88
89         dev->buf_async = NULL;
90         init_waitqueue_head(&dev->buf_readers);
91         init_waitqueue_head(&dev->buf_writers);
92
93         DRM_DEBUG("\n");
94
95         /*
96          * The kernel's context could be created here, but is now created
97          * in drm_dma_enqueue.  This is more resource-efficient for
98          * hardware that does not do DMA, but may mean that
99          * drm_select_queue fails between the time the interrupt is
100          * initialized and the time the queues are initialized.
101          */
102
103         return 0;
104 }
105
106 /**
107  * Open file.
108  *
109  * \param inode device inode
110  * \param filp file pointer.
111  * \return zero on success or a negative number on failure.
112  *
113  * Searches the DRM device with the same minor number, calls open_helper(), and
114  * increments the device open count. If the open count was previous at zero,
115  * i.e., it's the first that the device is open, then calls setup().
116  */
117 int drm_open(struct inode *inode, struct file *filp)
118 {
119         struct drm_device *dev = NULL;
120         int minor_id = iminor(inode);
121         struct drm_minor *minor;
122         int retcode = 0;
123
124         minor = idr_find(&drm_minors_idr, minor_id);
125         if (!minor)
126                 return -ENODEV;
127
128         if (!(dev = minor->dev))
129                 return -ENODEV;
130
131         retcode = drm_open_helper(inode, filp, dev);
132         if (!retcode) {
133                 atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
134                 spin_lock(&dev->count_lock);
135                 if (!dev->open_count++) {
136                         spin_unlock(&dev->count_lock);
137                         retcode = drm_setup(dev);
138                         goto out;
139                 }
140                 spin_unlock(&dev->count_lock);
141         }
142 out:
143         mutex_lock(&dev->struct_mutex);
144         if (minor->type == DRM_MINOR_LEGACY) {
145                 BUG_ON((dev->dev_mapping != NULL) &&
146                         (dev->dev_mapping != inode->i_mapping));
147                 if (dev->dev_mapping == NULL)
148                         dev->dev_mapping = inode->i_mapping;
149         }
150         mutex_unlock(&dev->struct_mutex);
151
152         return retcode;
153 }
154 EXPORT_SYMBOL(drm_open);
155
156 /**
157  * File \c open operation.
158  *
159  * \param inode device inode.
160  * \param filp file pointer.
161  *
162  * Puts the dev->fops corresponding to the device minor number into
163  * \p filp, call the \c open method, and restore the file operations.
164  */
165 int drm_stub_open(struct inode *inode, struct file *filp)
166 {
167         struct drm_device *dev = NULL;
168         struct drm_minor *minor;
169         int minor_id = iminor(inode);
170         int err = -ENODEV;
171         const struct file_operations *old_fops;
172
173         DRM_DEBUG("\n");
174
175         /* BKL pushdown: note that nothing else serializes idr_find() */
176         lock_kernel();
177         minor = idr_find(&drm_minors_idr, minor_id);
178         if (!minor)
179                 goto out;
180
181         if (!(dev = minor->dev))
182                 goto out;
183
184         old_fops = filp->f_op;
185         filp->f_op = fops_get(&dev->driver->fops);
186         if (filp->f_op == NULL) {
187                 filp->f_op = old_fops;
188                 goto out;
189         }
190         if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
191                 fops_put(filp->f_op);
192                 filp->f_op = fops_get(old_fops);
193         }
194         fops_put(old_fops);
195
196 out:
197         unlock_kernel();
198         return err;
199 }
200
201 /**
202  * Check whether DRI will run on this CPU.
203  *
204  * \return non-zero if the DRI will run on this CPU, or zero otherwise.
205  */
206 static int drm_cpu_valid(void)
207 {
208 #if defined(__i386__)
209         if (boot_cpu_data.x86 == 3)
210                 return 0;       /* No cmpxchg on a 386 */
211 #endif
212 #if defined(__sparc__) && !defined(__sparc_v9__)
213         return 0;               /* No cmpxchg before v9 sparc. */
214 #endif
215         return 1;
216 }
217
218 /**
219  * Called whenever a process opens /dev/drm.
220  *
221  * \param inode device inode.
222  * \param filp file pointer.
223  * \param dev device.
224  * \return zero on success or a negative number on failure.
225  *
226  * Creates and initializes a drm_file structure for the file private data in \p
227  * filp and add it into the double linked list in \p dev.
228  */
229 static int drm_open_helper(struct inode *inode, struct file *filp,
230                            struct drm_device * dev)
231 {
232         int minor_id = iminor(inode);
233         struct drm_file *priv;
234         int ret;
235
236         if (filp->f_flags & O_EXCL)
237                 return -EBUSY;  /* No exclusive opens */
238         if (!drm_cpu_valid())
239                 return -EINVAL;
240
241         DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);
242
243         priv = kmalloc(sizeof(*priv), GFP_KERNEL);
244         if (!priv)
245                 return -ENOMEM;
246
247         memset(priv, 0, sizeof(*priv));
248         filp->private_data = priv;
249         priv->filp = filp;
250         priv->uid = current_euid();
251         priv->pid = task_pid_nr(current);
252         priv->minor = idr_find(&drm_minors_idr, minor_id);
253         priv->ioctl_count = 0;
254         /* for compatibility root is always authenticated */
255         priv->authenticated = capable(CAP_SYS_ADMIN);
256         priv->lock_count = 0;
257
258         INIT_LIST_HEAD(&priv->lhead);
259         INIT_LIST_HEAD(&priv->fbs);
260         INIT_LIST_HEAD(&priv->event_list);
261         init_waitqueue_head(&priv->event_wait);
262         priv->event_space = 4096; /* set aside 4k for event buffer */
263
264         if (dev->driver->driver_features & DRIVER_GEM)
265                 drm_gem_open(dev, priv);
266
267         if (dev->driver->open) {
268                 ret = dev->driver->open(dev, priv);
269                 if (ret < 0)
270                         goto out_free;
271         }
272
273
274         /* if there is no current master make this fd it */
275         mutex_lock(&dev->struct_mutex);
276         if (!priv->minor->master) {
277                 /* create a new master */
278                 priv->minor->master = drm_master_create(priv->minor);
279                 if (!priv->minor->master) {
280                         mutex_unlock(&dev->struct_mutex);
281                         ret = -ENOMEM;
282                         goto out_free;
283                 }
284
285                 priv->is_master = 1;
286                 /* take another reference for the copy in the local file priv */
287                 priv->master = drm_master_get(priv->minor->master);
288
289                 priv->authenticated = 1;
290
291                 mutex_unlock(&dev->struct_mutex);
292                 if (dev->driver->master_create) {
293                         ret = dev->driver->master_create(dev, priv->master);
294                         if (ret) {
295                                 mutex_lock(&dev->struct_mutex);
296                                 /* drop both references if this fails */
297                                 drm_master_put(&priv->minor->master);
298                                 drm_master_put(&priv->master);
299                                 mutex_unlock(&dev->struct_mutex);
300                                 goto out_free;
301                         }
302                 }
303                 mutex_lock(&dev->struct_mutex);
304                 if (dev->driver->master_set) {
305                         ret = dev->driver->master_set(dev, priv, true);
306                         if (ret) {
307                                 /* drop both references if this fails */
308                                 drm_master_put(&priv->minor->master);
309                                 drm_master_put(&priv->master);
310                                 mutex_unlock(&dev->struct_mutex);
311                                 goto out_free;
312                         }
313                 }
314                 mutex_unlock(&dev->struct_mutex);
315         } else {
316                 /* get a reference to the master */
317                 priv->master = drm_master_get(priv->minor->master);
318                 mutex_unlock(&dev->struct_mutex);
319         }
320
321         mutex_lock(&dev->struct_mutex);
322         list_add(&priv->lhead, &dev->filelist);
323         mutex_unlock(&dev->struct_mutex);
324
325 #ifdef __alpha__
326         /*
327          * Default the hose
328          */
329         if (!dev->hose) {
330                 struct pci_dev *pci_dev;
331                 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
332                 if (pci_dev) {
333                         dev->hose = pci_dev->sysdata;
334                         pci_dev_put(pci_dev);
335                 }
336                 if (!dev->hose) {
337                         struct pci_bus *b = pci_bus_b(pci_root_buses.next);
338                         if (b)
339                                 dev->hose = b->sysdata;
340                 }
341         }
342 #endif
343
344         return 0;
345       out_free:
346         kfree(priv);
347         filp->private_data = NULL;
348         return ret;
349 }
350
351 /** No-op. */
352 int drm_fasync(int fd, struct file *filp, int on)
353 {
354         struct drm_file *priv = filp->private_data;
355         struct drm_device *dev = priv->minor->dev;
356
357         DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
358                   (long)old_encode_dev(priv->minor->device));
359         return fasync_helper(fd, filp, on, &dev->buf_async);
360 }
361 EXPORT_SYMBOL(drm_fasync);
362
363 /*
364  * Reclaim locked buffers; note that this may be a bad idea if the current
365  * context doesn't have the hw lock...
366  */
367 static void drm_reclaim_locked_buffers(struct drm_device *dev, struct file *f)
368 {
369         struct drm_file *file_priv = f->private_data;
370
371         if (drm_i_have_hw_lock(dev, file_priv)) {
372                 dev->driver->reclaim_buffers_locked(dev, file_priv);
373         } else {
374                 unsigned long _end = jiffies + 3 * DRM_HZ;
375                 int locked = 0;
376
377                 drm_idlelock_take(&file_priv->master->lock);
378
379                 /*
380                  * Wait for a while.
381                  */
382                 do {
383                         spin_lock_bh(&file_priv->master->lock.spinlock);
384                         locked = file_priv->master->lock.idle_has_lock;
385                         spin_unlock_bh(&file_priv->master->lock.spinlock);
386                         if (locked)
387                                 break;
388                         schedule();
389                 } while (!time_after_eq(jiffies, _end));
390
391                 if (!locked) {
392                         DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
393                                   "\tdriver to use reclaim_buffers_idlelocked() instead.\n"
394                                   "\tI will go on reclaiming the buffers anyway.\n");
395                 }
396
397                 dev->driver->reclaim_buffers_locked(dev, file_priv);
398                 drm_idlelock_release(&file_priv->master->lock);
399         }
400 }
401
402 static void drm_master_release(struct drm_device *dev, struct file *filp)
403 {
404         struct drm_file *file_priv = filp->private_data;
405
406         if (dev->driver->reclaim_buffers_locked &&
407             file_priv->master->lock.hw_lock)
408                 drm_reclaim_locked_buffers(dev, filp);
409
410         if (dev->driver->reclaim_buffers_idlelocked &&
411             file_priv->master->lock.hw_lock) {
412                 drm_idlelock_take(&file_priv->master->lock);
413                 dev->driver->reclaim_buffers_idlelocked(dev, file_priv);
414                 drm_idlelock_release(&file_priv->master->lock);
415         }
416
417
418         if (drm_i_have_hw_lock(dev, file_priv)) {
419                 DRM_DEBUG("File %p released, freeing lock for context %d\n",
420                           filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
421                 drm_lock_free(&file_priv->master->lock,
422                               _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
423         }
424
425         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
426             !dev->driver->reclaim_buffers_locked) {
427                 dev->driver->reclaim_buffers(dev, file_priv);
428         }
429 }
430
431 static void drm_events_release(struct drm_file *file_priv)
432 {
433         struct drm_device *dev = file_priv->minor->dev;
434         struct drm_pending_event *e, *et;
435         struct drm_pending_vblank_event *v, *vt;
436         unsigned long flags;
437
438         spin_lock_irqsave(&dev->event_lock, flags);
439
440         /* Remove pending flips */
441         list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
442                 if (v->base.file_priv == file_priv) {
443                         list_del(&v->base.link);
444                         drm_vblank_put(dev, v->pipe);
445                         v->base.destroy(&v->base);
446                 }
447
448         /* Remove unconsumed events */
449         list_for_each_entry_safe(e, et, &file_priv->event_list, link)
450                 e->destroy(e);
451
452         spin_unlock_irqrestore(&dev->event_lock, flags);
453 }
454
455 /**
456  * Release file.
457  *
458  * \param inode device inode
459  * \param file_priv DRM file private.
460  * \return zero on success or a negative number on failure.
461  *
462  * If the hardware lock is held then free it, and take it again for the kernel
463  * context since it's necessary to reclaim buffers. Unlink the file private
464  * data from its list and free it. Decreases the open count and if it reaches
465  * zero calls drm_lastclose().
466  */
467 int drm_release(struct inode *inode, struct file *filp)
468 {
469         struct drm_file *file_priv = filp->private_data;
470         struct drm_device *dev = file_priv->minor->dev;
471         int retcode = 0;
472
473         lock_kernel();
474
475         DRM_DEBUG("open_count = %d\n", dev->open_count);
476
477         if (dev->driver->preclose)
478                 dev->driver->preclose(dev, file_priv);
479
480         /* ========================================================
481          * Begin inline drm_release
482          */
483
484         DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
485                   task_pid_nr(current),
486                   (long)old_encode_dev(file_priv->minor->device),
487                   dev->open_count);
488
489         /* if the master has gone away we can't do anything with the lock */
490         if (file_priv->minor->master)
491                 drm_master_release(dev, filp);
492
493         drm_events_release(file_priv);
494
495         if (dev->driver->driver_features & DRIVER_GEM)
496                 drm_gem_release(dev, file_priv);
497
498         if (dev->driver->driver_features & DRIVER_MODESET)
499                 drm_fb_release(file_priv);
500
501         mutex_lock(&dev->ctxlist_mutex);
502         if (!list_empty(&dev->ctxlist)) {
503                 struct drm_ctx_list *pos, *n;
504
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,
510                                                                   pos->handle);
511
512                                 drm_ctxbitmap_free(dev, pos->handle);
513
514                                 list_del(&pos->head);
515                                 kfree(pos);
516                                 --dev->ctx_count;
517                         }
518                 }
519         }
520         mutex_unlock(&dev->ctxlist_mutex);
521
522         mutex_lock(&dev->struct_mutex);
523
524         if (file_priv->is_master) {
525                 struct drm_master *master = file_priv->master;
526                 struct drm_file *temp;
527                 list_for_each_entry(temp, &dev->filelist, lhead) {
528                         if ((temp->master == file_priv->master) &&
529                             (temp != file_priv))
530                                 temp->authenticated = 0;
531                 }
532
533                 /**
534                  * Since the master is disappearing, so is the
535                  * possibility to lock.
536                  */
537
538                 if (master->lock.hw_lock) {
539                         if (dev->sigdata.lock == master->lock.hw_lock)
540                                 dev->sigdata.lock = NULL;
541                         master->lock.hw_lock = NULL;
542                         master->lock.file_priv = NULL;
543                         wake_up_interruptible_all(&master->lock.lock_queue);
544                 }
545
546                 if (file_priv->minor->master == file_priv->master) {
547                         /* drop the reference held my the minor */
548                         if (dev->driver->master_drop)
549                                 dev->driver->master_drop(dev, file_priv, true);
550                         drm_master_put(&file_priv->minor->master);
551                 }
552         }
553
554         /* drop the reference held my the file priv */
555         drm_master_put(&file_priv->master);
556         file_priv->is_master = 0;
557         list_del(&file_priv->lhead);
558         mutex_unlock(&dev->struct_mutex);
559
560         if (dev->driver->postclose)
561                 dev->driver->postclose(dev, file_priv);
562         kfree(file_priv);
563
564         /* ========================================================
565          * End inline drm_release
566          */
567
568         atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
569         spin_lock(&dev->count_lock);
570         if (!--dev->open_count) {
571                 if (atomic_read(&dev->ioctl_count)) {
572                         DRM_ERROR("Device busy: %d\n",
573                                   atomic_read(&dev->ioctl_count));
574                         spin_unlock(&dev->count_lock);
575                         unlock_kernel();
576                         return -EBUSY;
577                 }
578                 spin_unlock(&dev->count_lock);
579                 unlock_kernel();
580                 return drm_lastclose(dev);
581         }
582         spin_unlock(&dev->count_lock);
583
584         unlock_kernel();
585
586         return retcode;
587 }
588 EXPORT_SYMBOL(drm_release);
589
590 static bool
591 drm_dequeue_event(struct drm_file *file_priv,
592                   size_t total, size_t max, struct drm_pending_event **out)
593 {
594         struct drm_device *dev = file_priv->minor->dev;
595         struct drm_pending_event *e;
596         unsigned long flags;
597         bool ret = false;
598
599         spin_lock_irqsave(&dev->event_lock, flags);
600
601         *out = NULL;
602         if (list_empty(&file_priv->event_list))
603                 goto out;
604         e = list_first_entry(&file_priv->event_list,
605                              struct drm_pending_event, link);
606         if (e->event->length + total > max)
607                 goto out;
608
609         file_priv->event_space += e->event->length;
610         list_del(&e->link);
611         *out = e;
612         ret = true;
613
614 out:
615         spin_unlock_irqrestore(&dev->event_lock, flags);
616         return ret;
617 }
618
619 ssize_t drm_read(struct file *filp, char __user *buffer,
620                  size_t count, loff_t *offset)
621 {
622         struct drm_file *file_priv = filp->private_data;
623         struct drm_pending_event *e;
624         size_t total;
625         ssize_t ret;
626
627         ret = wait_event_interruptible(file_priv->event_wait,
628                                        !list_empty(&file_priv->event_list));
629         if (ret < 0)
630                 return ret;
631
632         total = 0;
633         while (drm_dequeue_event(file_priv, total, count, &e)) {
634                 if (copy_to_user(buffer + total,
635                                  e->event, e->event->length)) {
636                         total = -EFAULT;
637                         break;
638                 }
639
640                 total += e->event->length;
641                 e->destroy(e);
642         }
643
644         return total;
645 }
646 EXPORT_SYMBOL(drm_read);
647
648 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
649 {
650         struct drm_file *file_priv = filp->private_data;
651         unsigned int mask = 0;
652
653         poll_wait(filp, &file_priv->event_wait, wait);
654
655         if (!list_empty(&file_priv->event_list))
656                 mask |= POLLIN | POLLRDNORM;
657
658         return mask;
659 }
660 EXPORT_SYMBOL(drm_poll);