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
)
54 if (dev
->driver
->firstopen
) {
55 ret
= dev
->driver
->firstopen(dev
);
60 atomic_set(&dev
->ioctl_count
, 0);
61 atomic_set(&dev
->vma_count
, 0);
63 i
= drm_legacy_dma_setup(dev
);
67 for (i
= 0; i
< ARRAY_SIZE(dev
->counts
); i
++)
68 atomic_set(&dev
->counts
[i
], 0);
70 dev
->sigdata
.lock
= NULL
;
72 dev
->context_flag
= 0;
73 dev
->last_context
= 0;
79 * The kernel's context could be created here, but is now created
80 * in drm_dma_enqueue. This is more resource-efficient for
81 * hardware that does not do DMA, but may mean that
82 * drm_select_queue fails between the time the interrupt is
83 * initialized and the time the queues are initialized.
92 * \param inode device inode
93 * \param filp file pointer.
94 * \return zero on success or a negative number on failure.
96 * Searches the DRM device with the same minor number, calls open_helper(), and
97 * increments the device open count. If the open count was previous at zero,
98 * i.e., it's the first that the device is open, then calls setup().
100 int drm_open(struct inode
*inode
, struct file
*filp
)
102 struct drm_device
*dev
= NULL
;
103 int minor_id
= iminor(inode
);
104 struct drm_minor
*minor
;
107 struct address_space
*old_mapping
;
108 struct address_space
*old_imapping
;
110 minor
= idr_find(&drm_minors_idr
, minor_id
);
114 if (!(dev
= minor
->dev
))
117 if (drm_device_is_unplugged(dev
))
120 if (!dev
->open_count
++)
122 mutex_lock(&dev
->struct_mutex
);
123 old_imapping
= inode
->i_mapping
;
124 old_mapping
= dev
->dev_mapping
;
125 if (old_mapping
== NULL
)
126 dev
->dev_mapping
= &inode
->i_data
;
127 /* ihold ensures nobody can remove inode with our i_data */
128 ihold(container_of(dev
->dev_mapping
, struct inode
, i_data
));
129 inode
->i_mapping
= dev
->dev_mapping
;
130 filp
->f_mapping
= dev
->dev_mapping
;
131 mutex_unlock(&dev
->struct_mutex
);
133 retcode
= drm_open_helper(inode
, filp
, dev
);
136 atomic_inc(&dev
->counts
[_DRM_STAT_OPENS
]);
138 retcode
= drm_setup(dev
);
145 mutex_lock(&dev
->struct_mutex
);
146 filp
->f_mapping
= old_imapping
;
147 inode
->i_mapping
= old_imapping
;
148 iput(container_of(dev
->dev_mapping
, struct inode
, i_data
));
149 dev
->dev_mapping
= old_mapping
;
150 mutex_unlock(&dev
->struct_mutex
);
154 EXPORT_SYMBOL(drm_open
);
157 * File \c open operation.
159 * \param inode device inode.
160 * \param filp file pointer.
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.
165 int drm_stub_open(struct inode
*inode
, struct file
*filp
)
167 struct drm_device
*dev
= NULL
;
168 struct drm_minor
*minor
;
169 int minor_id
= iminor(inode
);
171 const struct file_operations
*old_fops
;
175 mutex_lock(&drm_global_mutex
);
176 minor
= idr_find(&drm_minors_idr
, minor_id
);
180 if (!(dev
= minor
->dev
))
183 if (drm_device_is_unplugged(dev
))
186 old_fops
= filp
->f_op
;
187 filp
->f_op
= fops_get(dev
->driver
->fops
);
188 if (filp
->f_op
== NULL
) {
189 filp
->f_op
= old_fops
;
192 if (filp
->f_op
->open
&& (err
= filp
->f_op
->open(inode
, filp
))) {
193 fops_put(filp
->f_op
);
194 filp
->f_op
= fops_get(old_fops
);
199 mutex_unlock(&drm_global_mutex
);
204 * Check whether DRI will run on this CPU.
206 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
208 static int drm_cpu_valid(void)
210 #if defined(__i386__)
211 if (boot_cpu_data
.x86
== 3)
212 return 0; /* No cmpxchg on a 386 */
214 #if defined(__sparc__) && !defined(__sparc_v9__)
215 return 0; /* No cmpxchg before v9 sparc. */
221 * Called whenever a process opens /dev/drm.
223 * \param inode device inode.
224 * \param filp file pointer.
226 * \return zero on success or a negative number on failure.
228 * Creates and initializes a drm_file structure for the file private data in \p
229 * filp and add it into the double linked list in \p dev.
231 static int drm_open_helper(struct inode
*inode
, struct file
*filp
,
232 struct drm_device
* dev
)
234 int minor_id
= iminor(inode
);
235 struct drm_file
*priv
;
238 if (filp
->f_flags
& O_EXCL
)
239 return -EBUSY
; /* No exclusive opens */
240 if (!drm_cpu_valid())
242 if (dev
->switch_power_state
!= DRM_SWITCH_POWER_ON
)
245 DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current
), minor_id
);
247 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
251 filp
->private_data
= priv
;
253 priv
->uid
= current_euid();
254 priv
->pid
= get_pid(task_pid(current
));
255 priv
->minor
= idr_find(&drm_minors_idr
, minor_id
);
261 priv
->ioctl_count
= 0;
262 /* for compatibility root is always authenticated */
263 priv
->authenticated
= capable(CAP_SYS_ADMIN
);
264 priv
->lock_count
= 0;
266 INIT_LIST_HEAD(&priv
->lhead
);
267 INIT_LIST_HEAD(&priv
->fbs
);
268 mutex_init(&priv
->fbs_lock
);
269 INIT_LIST_HEAD(&priv
->event_list
);
270 init_waitqueue_head(&priv
->event_wait
);
271 priv
->event_space
= 4096; /* set aside 4k for event buffer */
273 if (dev
->driver
->driver_features
& DRIVER_GEM
)
274 drm_gem_open(dev
, priv
);
276 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
277 drm_prime_init_file_private(&priv
->prime
);
279 if (dev
->driver
->open
) {
280 ret
= dev
->driver
->open(dev
, priv
);
282 goto out_prime_destroy
;
286 /* if there is no current master make this fd it */
287 mutex_lock(&dev
->struct_mutex
);
288 if (!priv
->minor
->master
) {
289 /* create a new master */
290 priv
->minor
->master
= drm_master_create(priv
->minor
);
291 if (!priv
->minor
->master
) {
292 mutex_unlock(&dev
->struct_mutex
);
298 /* take another reference for the copy in the local file priv */
299 priv
->master
= drm_master_get(priv
->minor
->master
);
301 priv
->authenticated
= 1;
303 mutex_unlock(&dev
->struct_mutex
);
304 if (dev
->driver
->master_create
) {
305 ret
= dev
->driver
->master_create(dev
, priv
->master
);
307 mutex_lock(&dev
->struct_mutex
);
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
);
315 mutex_lock(&dev
->struct_mutex
);
316 if (dev
->driver
->master_set
) {
317 ret
= dev
->driver
->master_set(dev
, priv
, true);
319 /* drop both references if this fails */
320 drm_master_put(&priv
->minor
->master
);
321 drm_master_put(&priv
->master
);
322 mutex_unlock(&dev
->struct_mutex
);
326 mutex_unlock(&dev
->struct_mutex
);
328 /* get a reference to the master */
329 priv
->master
= drm_master_get(priv
->minor
->master
);
330 mutex_unlock(&dev
->struct_mutex
);
333 mutex_lock(&dev
->struct_mutex
);
334 list_add(&priv
->lhead
, &dev
->filelist
);
335 mutex_unlock(&dev
->struct_mutex
);
342 struct pci_dev
*pci_dev
;
343 pci_dev
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, NULL
);
345 dev
->hose
= pci_dev
->sysdata
;
346 pci_dev_put(pci_dev
);
349 struct pci_bus
*b
= pci_bus_b(pci_root_buses
.next
);
351 dev
->hose
= b
->sysdata
;
359 if (dev
->driver
->postclose
)
360 dev
->driver
->postclose(dev
, priv
);
362 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
363 drm_prime_destroy_file_private(&priv
->prime
);
364 if (dev
->driver
->driver_features
& DRIVER_GEM
)
365 drm_gem_release(dev
, priv
);
369 filp
->private_data
= NULL
;
373 static void drm_master_release(struct drm_device
*dev
, struct file
*filp
)
375 struct drm_file
*file_priv
= filp
->private_data
;
377 if (drm_i_have_hw_lock(dev
, file_priv
)) {
378 DRM_DEBUG("File %p released, freeing lock for context %d\n",
379 filp
, _DRM_LOCKING_CONTEXT(file_priv
->master
->lock
.hw_lock
->lock
));
380 drm_lock_free(&file_priv
->master
->lock
,
381 _DRM_LOCKING_CONTEXT(file_priv
->master
->lock
.hw_lock
->lock
));
385 static void drm_events_release(struct drm_file
*file_priv
)
387 struct drm_device
*dev
= file_priv
->minor
->dev
;
388 struct drm_pending_event
*e
, *et
;
389 struct drm_pending_vblank_event
*v
, *vt
;
392 spin_lock_irqsave(&dev
->event_lock
, flags
);
394 /* Remove pending flips */
395 list_for_each_entry_safe(v
, vt
, &dev
->vblank_event_list
, base
.link
)
396 if (v
->base
.file_priv
== file_priv
) {
397 list_del(&v
->base
.link
);
398 drm_vblank_put(dev
, v
->pipe
);
399 v
->base
.destroy(&v
->base
);
402 /* Remove unconsumed events */
403 list_for_each_entry_safe(e
, et
, &file_priv
->event_list
, link
)
406 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
412 * \param inode device inode
413 * \param file_priv DRM file private.
414 * \return zero on success or a negative number on failure.
416 * If the hardware lock is held then free it, and take it again for the kernel
417 * context since it's necessary to reclaim buffers. Unlink the file private
418 * data from its list and free it. Decreases the open count and if it reaches
419 * zero calls drm_lastclose().
421 int drm_release(struct inode
*inode
, struct file
*filp
)
423 struct drm_file
*file_priv
= filp
->private_data
;
424 struct drm_device
*dev
= file_priv
->minor
->dev
;
427 mutex_lock(&drm_global_mutex
);
429 DRM_DEBUG("open_count = %d\n", dev
->open_count
);
431 if (dev
->driver
->preclose
)
432 dev
->driver
->preclose(dev
, file_priv
);
434 /* ========================================================
435 * Begin inline drm_release
438 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
439 task_pid_nr(current
),
440 (long)old_encode_dev(file_priv
->minor
->device
),
443 /* Release any auth tokens that might point to this file_priv,
444 (do that under the drm_global_mutex) */
445 if (file_priv
->magic
)
446 (void) drm_remove_magic(file_priv
->master
, file_priv
->magic
);
448 /* if the master has gone away we can't do anything with the lock */
449 if (file_priv
->minor
->master
)
450 drm_master_release(dev
, filp
);
452 if (drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
453 drm_core_reclaim_buffers(dev
, file_priv
);
455 drm_events_release(file_priv
);
457 if (dev
->driver
->driver_features
& DRIVER_MODESET
)
458 drm_fb_release(file_priv
);
460 if (dev
->driver
->driver_features
& DRIVER_GEM
)
461 drm_gem_release(dev
, file_priv
);
463 drm_legacy_ctxbitmap_release(dev
, file_priv
);
465 mutex_lock(&dev
->struct_mutex
);
467 if (file_priv
->is_master
) {
468 struct drm_master
*master
= file_priv
->master
;
469 struct drm_file
*temp
;
470 list_for_each_entry(temp
, &dev
->filelist
, lhead
) {
471 if ((temp
->master
== file_priv
->master
) &&
473 temp
->authenticated
= 0;
477 * Since the master is disappearing, so is the
478 * possibility to lock.
481 if (master
->lock
.hw_lock
) {
482 if (dev
->sigdata
.lock
== master
->lock
.hw_lock
)
483 dev
->sigdata
.lock
= NULL
;
484 master
->lock
.hw_lock
= NULL
;
485 master
->lock
.file_priv
= NULL
;
486 wake_up_interruptible_all(&master
->lock
.lock_queue
);
489 if (file_priv
->minor
->master
== file_priv
->master
) {
490 /* drop the reference held my the minor */
491 if (dev
->driver
->master_drop
)
492 dev
->driver
->master_drop(dev
, file_priv
, true);
493 drm_master_put(&file_priv
->minor
->master
);
497 BUG_ON(dev
->dev_mapping
== NULL
);
498 iput(container_of(dev
->dev_mapping
, struct inode
, i_data
));
500 /* drop the reference held my the file priv */
501 drm_master_put(&file_priv
->master
);
502 file_priv
->is_master
= 0;
503 list_del(&file_priv
->lhead
);
504 mutex_unlock(&dev
->struct_mutex
);
506 if (dev
->driver
->postclose
)
507 dev
->driver
->postclose(dev
, file_priv
);
509 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
510 drm_prime_destroy_file_private(&file_priv
->prime
);
512 put_pid(file_priv
->pid
);
515 /* ========================================================
516 * End inline drm_release
519 atomic_inc(&dev
->counts
[_DRM_STAT_CLOSES
]);
520 if (!--dev
->open_count
) {
521 if (atomic_read(&dev
->ioctl_count
)) {
522 DRM_ERROR("Device busy: %d\n",
523 atomic_read(&dev
->ioctl_count
));
526 retcode
= drm_lastclose(dev
);
527 if (drm_device_is_unplugged(dev
))
530 mutex_unlock(&drm_global_mutex
);
534 EXPORT_SYMBOL(drm_release
);
537 drm_dequeue_event(struct drm_file
*file_priv
,
538 size_t total
, size_t max
, struct drm_pending_event
**out
)
540 struct drm_device
*dev
= file_priv
->minor
->dev
;
541 struct drm_pending_event
*e
;
545 spin_lock_irqsave(&dev
->event_lock
, flags
);
548 if (list_empty(&file_priv
->event_list
))
550 e
= list_first_entry(&file_priv
->event_list
,
551 struct drm_pending_event
, link
);
552 if (e
->event
->length
+ total
> max
)
555 file_priv
->event_space
+= e
->event
->length
;
561 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
565 ssize_t
drm_read(struct file
*filp
, char __user
*buffer
,
566 size_t count
, loff_t
*offset
)
568 struct drm_file
*file_priv
= filp
->private_data
;
569 struct drm_pending_event
*e
;
573 ret
= wait_event_interruptible(file_priv
->event_wait
,
574 !list_empty(&file_priv
->event_list
));
579 while (drm_dequeue_event(file_priv
, total
, count
, &e
)) {
580 if (copy_to_user(buffer
+ total
,
581 e
->event
, e
->event
->length
)) {
586 total
+= e
->event
->length
;
592 EXPORT_SYMBOL(drm_read
);
594 unsigned int drm_poll(struct file
*filp
, struct poll_table_struct
*wait
)
596 struct drm_file
*file_priv
= filp
->private_data
;
597 unsigned int mask
= 0;
599 poll_wait(filp
, &file_priv
->event_wait
, wait
);
601 if (!list_empty(&file_priv
->event_list
))
602 mask
|= POLLIN
| POLLRDNORM
;
606 EXPORT_SYMBOL(drm_poll
);
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