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[karo-tx-linux.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 <drm/drmP.h>
38 #include <linux/poll.h>
39 #include <linux/slab.h>
40 #include <linux/module.h>
41 #include "drm_legacy.h"
42 #include "drm_internal.h"
43
44 /* from BKL pushdown */
45 DEFINE_MUTEX(drm_global_mutex);
46
47 static int drm_open_helper(struct file *filp, struct drm_minor *minor);
48
49 static int drm_setup(struct drm_device * dev)
50 {
51         int ret;
52
53         if (dev->driver->firstopen &&
54             !drm_core_check_feature(dev, DRIVER_MODESET)) {
55                 ret = dev->driver->firstopen(dev);
56                 if (ret != 0)
57                         return ret;
58         }
59
60         ret = drm_legacy_dma_setup(dev);
61         if (ret < 0)
62                 return ret;
63
64
65         DRM_DEBUG("\n");
66         return 0;
67 }
68
69 /**
70  * Open file.
71  *
72  * \param inode device inode
73  * \param filp file pointer.
74  * \return zero on success or a negative number on failure.
75  *
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().
79  */
80 int drm_open(struct inode *inode, struct file *filp)
81 {
82         struct drm_device *dev;
83         struct drm_minor *minor;
84         int retcode;
85         int need_setup = 0;
86
87         minor = drm_minor_acquire(iminor(inode));
88         if (IS_ERR(minor))
89                 return PTR_ERR(minor);
90
91         dev = minor->dev;
92         if (!dev->open_count++)
93                 need_setup = 1;
94
95         /* share address_space across all char-devs of a single device */
96         filp->f_mapping = dev->anon_inode->i_mapping;
97
98         retcode = drm_open_helper(filp, minor);
99         if (retcode)
100                 goto err_undo;
101         if (need_setup) {
102                 retcode = drm_setup(dev);
103                 if (retcode)
104                         goto err_undo;
105         }
106         return 0;
107
108 err_undo:
109         dev->open_count--;
110         drm_minor_release(minor);
111         return retcode;
112 }
113 EXPORT_SYMBOL(drm_open);
114
115 /**
116  * Check whether DRI will run on this CPU.
117  *
118  * \return non-zero if the DRI will run on this CPU, or zero otherwise.
119  */
120 static int drm_cpu_valid(void)
121 {
122 #if defined(__sparc__) && !defined(__sparc_v9__)
123         return 0;               /* No cmpxchg before v9 sparc. */
124 #endif
125         return 1;
126 }
127
128 /**
129  * Called whenever a process opens /dev/drm.
130  *
131  * \param filp file pointer.
132  * \param minor acquired minor-object.
133  * \return zero on success or a negative number on failure.
134  *
135  * Creates and initializes a drm_file structure for the file private data in \p
136  * filp and add it into the double linked list in \p dev.
137  */
138 static int drm_open_helper(struct file *filp, struct drm_minor *minor)
139 {
140         struct drm_device *dev = minor->dev;
141         struct drm_file *priv;
142         int ret;
143
144         if (filp->f_flags & O_EXCL)
145                 return -EBUSY;  /* No exclusive opens */
146         if (!drm_cpu_valid())
147                 return -EINVAL;
148         if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
149                 return -EINVAL;
150
151         DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index);
152
153         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
154         if (!priv)
155                 return -ENOMEM;
156
157         filp->private_data = priv;
158         priv->filp = filp;
159         priv->uid = current_euid();
160         priv->pid = get_pid(task_pid(current));
161         priv->minor = minor;
162
163         /* for compatibility root is always authenticated */
164         priv->authenticated = capable(CAP_SYS_ADMIN);
165         priv->lock_count = 0;
166
167         INIT_LIST_HEAD(&priv->lhead);
168         INIT_LIST_HEAD(&priv->fbs);
169         mutex_init(&priv->fbs_lock);
170         INIT_LIST_HEAD(&priv->blobs);
171         INIT_LIST_HEAD(&priv->event_list);
172         init_waitqueue_head(&priv->event_wait);
173         priv->event_space = 4096; /* set aside 4k for event buffer */
174
175         if (drm_core_check_feature(dev, DRIVER_GEM))
176                 drm_gem_open(dev, priv);
177
178         if (drm_core_check_feature(dev, DRIVER_PRIME))
179                 drm_prime_init_file_private(&priv->prime);
180
181         if (dev->driver->open) {
182                 ret = dev->driver->open(dev, priv);
183                 if (ret < 0)
184                         goto out_prime_destroy;
185         }
186
187         /* if there is no current master make this fd it, but do not create
188          * any master object for render clients */
189         mutex_lock(&dev->master_mutex);
190         if (drm_is_primary_client(priv) && !priv->minor->master) {
191                 /* create a new master */
192                 priv->minor->master = drm_master_create(priv->minor);
193                 if (!priv->minor->master) {
194                         ret = -ENOMEM;
195                         goto out_close;
196                 }
197
198                 priv->is_master = 1;
199                 /* take another reference for the copy in the local file priv */
200                 priv->master = drm_master_get(priv->minor->master);
201                 priv->authenticated = 1;
202
203                 if (dev->driver->master_create) {
204                         ret = dev->driver->master_create(dev, priv->master);
205                         if (ret) {
206                                 /* drop both references if this fails */
207                                 drm_master_put(&priv->minor->master);
208                                 drm_master_put(&priv->master);
209                                 goto out_close;
210                         }
211                 }
212                 if (dev->driver->master_set) {
213                         ret = dev->driver->master_set(dev, priv, true);
214                         if (ret) {
215                                 /* drop both references if this fails */
216                                 drm_master_put(&priv->minor->master);
217                                 drm_master_put(&priv->master);
218                                 goto out_close;
219                         }
220                 }
221         } else if (drm_is_primary_client(priv)) {
222                 /* get a reference to the master */
223                 priv->master = drm_master_get(priv->minor->master);
224         }
225         mutex_unlock(&dev->master_mutex);
226
227         mutex_lock(&dev->struct_mutex);
228         list_add(&priv->lhead, &dev->filelist);
229         mutex_unlock(&dev->struct_mutex);
230
231 #ifdef __alpha__
232         /*
233          * Default the hose
234          */
235         if (!dev->hose) {
236                 struct pci_dev *pci_dev;
237                 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
238                 if (pci_dev) {
239                         dev->hose = pci_dev->sysdata;
240                         pci_dev_put(pci_dev);
241                 }
242                 if (!dev->hose) {
243                         struct pci_bus *b = list_entry(pci_root_buses.next,
244                                 struct pci_bus, node);
245                         if (b)
246                                 dev->hose = b->sysdata;
247                 }
248         }
249 #endif
250
251         return 0;
252
253 out_close:
254         mutex_unlock(&dev->master_mutex);
255         if (dev->driver->postclose)
256                 dev->driver->postclose(dev, priv);
257 out_prime_destroy:
258         if (drm_core_check_feature(dev, DRIVER_PRIME))
259                 drm_prime_destroy_file_private(&priv->prime);
260         if (drm_core_check_feature(dev, DRIVER_GEM))
261                 drm_gem_release(dev, priv);
262         put_pid(priv->pid);
263         kfree(priv);
264         filp->private_data = NULL;
265         return ret;
266 }
267
268 static void drm_master_release(struct drm_device *dev, struct file *filp)
269 {
270         struct drm_file *file_priv = filp->private_data;
271
272         if (drm_legacy_i_have_hw_lock(dev, file_priv)) {
273                 DRM_DEBUG("File %p released, freeing lock for context %d\n",
274                           filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
275                 drm_legacy_lock_free(&file_priv->master->lock,
276                                      _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
277         }
278 }
279
280 static void drm_events_release(struct drm_file *file_priv)
281 {
282         struct drm_device *dev = file_priv->minor->dev;
283         struct drm_pending_event *e, *et;
284         struct drm_pending_vblank_event *v, *vt;
285         unsigned long flags;
286
287         spin_lock_irqsave(&dev->event_lock, flags);
288
289         /* Remove pending flips */
290         list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
291                 if (v->base.file_priv == file_priv) {
292                         list_del(&v->base.link);
293                         drm_vblank_put(dev, v->pipe);
294                         v->base.destroy(&v->base);
295                 }
296
297         /* Remove unconsumed events */
298         list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
299                 list_del(&e->link);
300                 e->destroy(e);
301         }
302
303         spin_unlock_irqrestore(&dev->event_lock, flags);
304 }
305
306 /**
307  * drm_legacy_dev_reinit
308  *
309  * Reinitializes a legacy/ums drm device in it's lastclose function.
310  */
311 static void drm_legacy_dev_reinit(struct drm_device *dev)
312 {
313         if (drm_core_check_feature(dev, DRIVER_MODESET))
314                 return;
315
316         dev->sigdata.lock = NULL;
317
318         dev->context_flag = 0;
319         dev->last_context = 0;
320         dev->if_version = 0;
321 }
322
323 /**
324  * Take down the DRM device.
325  *
326  * \param dev DRM device structure.
327  *
328  * Frees every resource in \p dev.
329  *
330  * \sa drm_device
331  */
332 int drm_lastclose(struct drm_device * dev)
333 {
334         DRM_DEBUG("\n");
335
336         if (dev->driver->lastclose)
337                 dev->driver->lastclose(dev);
338         DRM_DEBUG("driver lastclose completed\n");
339
340         if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
341                 drm_irq_uninstall(dev);
342
343         mutex_lock(&dev->struct_mutex);
344
345         drm_agp_clear(dev);
346
347         drm_legacy_sg_cleanup(dev);
348         drm_legacy_vma_flush(dev);
349         drm_legacy_dma_takedown(dev);
350
351         mutex_unlock(&dev->struct_mutex);
352
353         drm_legacy_dev_reinit(dev);
354
355         DRM_DEBUG("lastclose completed\n");
356         return 0;
357 }
358
359 /**
360  * Release file.
361  *
362  * \param inode device inode
363  * \param file_priv DRM file private.
364  * \return zero on success or a negative number on failure.
365  *
366  * If the hardware lock is held then free it, and take it again for the kernel
367  * context since it's necessary to reclaim buffers. Unlink the file private
368  * data from its list and free it. Decreases the open count and if it reaches
369  * zero calls drm_lastclose().
370  */
371 int drm_release(struct inode *inode, struct file *filp)
372 {
373         struct drm_file *file_priv = filp->private_data;
374         struct drm_minor *minor = file_priv->minor;
375         struct drm_device *dev = minor->dev;
376         int retcode = 0;
377
378         mutex_lock(&drm_global_mutex);
379
380         DRM_DEBUG("open_count = %d\n", dev->open_count);
381
382         mutex_lock(&dev->struct_mutex);
383         list_del(&file_priv->lhead);
384         if (file_priv->magic)
385                 idr_remove(&file_priv->master->magic_map, file_priv->magic);
386         mutex_unlock(&dev->struct_mutex);
387
388         if (dev->driver->preclose)
389                 dev->driver->preclose(dev, file_priv);
390
391         /* ========================================================
392          * Begin inline drm_release
393          */
394
395         DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
396                   task_pid_nr(current),
397                   (long)old_encode_dev(file_priv->minor->kdev->devt),
398                   dev->open_count);
399
400         /* if the master has gone away we can't do anything with the lock */
401         if (file_priv->minor->master)
402                 drm_master_release(dev, filp);
403
404         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
405                 drm_legacy_reclaim_buffers(dev, file_priv);
406
407         drm_events_release(file_priv);
408
409         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
410                 drm_fb_release(file_priv);
411                 drm_property_destroy_user_blobs(dev, file_priv);
412         }
413
414         if (drm_core_check_feature(dev, DRIVER_GEM))
415                 drm_gem_release(dev, file_priv);
416
417         drm_legacy_ctxbitmap_flush(dev, file_priv);
418
419         mutex_lock(&dev->master_mutex);
420
421         if (file_priv->is_master) {
422                 struct drm_master *master = file_priv->master;
423
424                 /**
425                  * Since the master is disappearing, so is the
426                  * possibility to lock.
427                  */
428                 mutex_lock(&dev->struct_mutex);
429                 if (master->lock.hw_lock) {
430                         if (dev->sigdata.lock == master->lock.hw_lock)
431                                 dev->sigdata.lock = NULL;
432                         master->lock.hw_lock = NULL;
433                         master->lock.file_priv = NULL;
434                         wake_up_interruptible_all(&master->lock.lock_queue);
435                 }
436                 mutex_unlock(&dev->struct_mutex);
437
438                 if (file_priv->minor->master == file_priv->master) {
439                         /* drop the reference held my the minor */
440                         if (dev->driver->master_drop)
441                                 dev->driver->master_drop(dev, file_priv, true);
442                         drm_master_put(&file_priv->minor->master);
443                 }
444         }
445
446         /* drop the master reference held by the file priv */
447         if (file_priv->master)
448                 drm_master_put(&file_priv->master);
449         file_priv->is_master = 0;
450         mutex_unlock(&dev->master_mutex);
451
452         if (dev->driver->postclose)
453                 dev->driver->postclose(dev, file_priv);
454
455
456         if (drm_core_check_feature(dev, DRIVER_PRIME))
457                 drm_prime_destroy_file_private(&file_priv->prime);
458
459         WARN_ON(!list_empty(&file_priv->event_list));
460
461         put_pid(file_priv->pid);
462         kfree(file_priv);
463
464         /* ========================================================
465          * End inline drm_release
466          */
467
468         if (!--dev->open_count) {
469                 retcode = drm_lastclose(dev);
470                 if (drm_device_is_unplugged(dev))
471                         drm_put_dev(dev);
472         }
473         mutex_unlock(&drm_global_mutex);
474
475         drm_minor_release(minor);
476
477         return retcode;
478 }
479 EXPORT_SYMBOL(drm_release);
480
481 ssize_t drm_read(struct file *filp, char __user *buffer,
482                  size_t count, loff_t *offset)
483 {
484         struct drm_file *file_priv = filp->private_data;
485         struct drm_device *dev = file_priv->minor->dev;
486         ssize_t ret = 0;
487
488         if (!access_ok(VERIFY_WRITE, buffer, count))
489                 return -EFAULT;
490
491         spin_lock_irq(&dev->event_lock);
492         for (;;) {
493                 if (list_empty(&file_priv->event_list)) {
494                         if (ret)
495                                 break;
496
497                         if (filp->f_flags & O_NONBLOCK) {
498                                 ret = -EAGAIN;
499                                 break;
500                         }
501
502                         spin_unlock_irq(&dev->event_lock);
503                         ret = wait_event_interruptible(file_priv->event_wait,
504                                                        !list_empty(&file_priv->event_list));
505                         spin_lock_irq(&dev->event_lock);
506                         if (ret < 0)
507                                 break;
508
509                         ret = 0;
510                 } else {
511                         struct drm_pending_event *e;
512
513                         e = list_first_entry(&file_priv->event_list,
514                                              struct drm_pending_event, link);
515                         if (e->event->length + ret > count)
516                                 break;
517
518                         if (__copy_to_user_inatomic(buffer + ret,
519                                                     e->event, e->event->length)) {
520                                 if (ret == 0)
521                                         ret = -EFAULT;
522                                 break;
523                         }
524
525                         file_priv->event_space += e->event->length;
526                         ret += e->event->length;
527                         list_del(&e->link);
528                         e->destroy(e);
529                 }
530         }
531         spin_unlock_irq(&dev->event_lock);
532
533         return ret;
534 }
535 EXPORT_SYMBOL(drm_read);
536
537 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
538 {
539         struct drm_file *file_priv = filp->private_data;
540         unsigned int mask = 0;
541
542         poll_wait(filp, &file_priv->event_wait, wait);
543
544         if (!list_empty(&file_priv->event_list))
545                 mask |= POLLIN | POLLRDNORM;
546
547         return mask;
548 }
549 EXPORT_SYMBOL(drm_poll);