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 !drm_core_check_feature(dev
, DRIVER_MODESET
)) {
56 ret
= dev
->driver
->firstopen(dev
);
61 atomic_set(&dev
->ioctl_count
, 0);
62 atomic_set(&dev
->vma_count
, 0);
64 i
= drm_legacy_dma_setup(dev
);
68 for (i
= 0; i
< ARRAY_SIZE(dev
->counts
); i
++)
69 atomic_set(&dev
->counts
[i
], 0);
71 dev
->sigdata
.lock
= NULL
;
73 dev
->context_flag
= 0;
74 dev
->last_context
= 0;
80 * The kernel's context could be created here, but is now created
81 * in drm_dma_enqueue. This is more resource-efficient for
82 * hardware that does not do DMA, but may mean that
83 * drm_select_queue fails between the time the interrupt is
84 * initialized and the time the queues are initialized.
93 * \param inode device inode
94 * \param filp file pointer.
95 * \return zero on success or a negative number on failure.
97 * Searches the DRM device with the same minor number, calls open_helper(), and
98 * increments the device open count. If the open count was previous at zero,
99 * i.e., it's the first that the device is open, then calls setup().
101 int drm_open(struct inode
*inode
, struct file
*filp
)
103 struct drm_device
*dev
= NULL
;
104 int minor_id
= iminor(inode
);
105 struct drm_minor
*minor
;
108 struct address_space
*old_mapping
;
109 struct address_space
*old_imapping
;
111 minor
= idr_find(&drm_minors_idr
, minor_id
);
115 if (!(dev
= minor
->dev
))
118 if (drm_device_is_unplugged(dev
))
121 if (!dev
->open_count
++)
123 mutex_lock(&dev
->struct_mutex
);
124 old_imapping
= inode
->i_mapping
;
125 old_mapping
= dev
->dev_mapping
;
126 if (old_mapping
== NULL
)
127 dev
->dev_mapping
= &inode
->i_data
;
128 /* ihold ensures nobody can remove inode with our i_data */
129 ihold(container_of(dev
->dev_mapping
, struct inode
, i_data
));
130 inode
->i_mapping
= dev
->dev_mapping
;
131 filp
->f_mapping
= dev
->dev_mapping
;
132 mutex_unlock(&dev
->struct_mutex
);
134 retcode
= drm_open_helper(inode
, filp
, dev
);
137 atomic_inc(&dev
->counts
[_DRM_STAT_OPENS
]);
139 retcode
= drm_setup(dev
);
146 mutex_lock(&dev
->struct_mutex
);
147 filp
->f_mapping
= old_imapping
;
148 inode
->i_mapping
= old_imapping
;
149 iput(container_of(dev
->dev_mapping
, struct inode
, i_data
));
150 dev
->dev_mapping
= old_mapping
;
151 mutex_unlock(&dev
->struct_mutex
);
155 EXPORT_SYMBOL(drm_open
);
158 * File \c open operation.
160 * \param inode device inode.
161 * \param filp file pointer.
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.
166 int drm_stub_open(struct inode
*inode
, struct file
*filp
)
168 struct drm_device
*dev
= NULL
;
169 struct drm_minor
*minor
;
170 int minor_id
= iminor(inode
);
172 const struct file_operations
*old_fops
;
176 mutex_lock(&drm_global_mutex
);
177 minor
= idr_find(&drm_minors_idr
, minor_id
);
181 if (!(dev
= minor
->dev
))
184 if (drm_device_is_unplugged(dev
))
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
;
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
);
200 mutex_unlock(&drm_global_mutex
);
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 */
215 #if defined(__sparc__) && !defined(__sparc_v9__)
216 return 0; /* No cmpxchg before v9 sparc. */
222 * Called whenever a process opens /dev/drm.
224 * \param inode device inode.
225 * \param filp file pointer.
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
;
239 if (filp
->f_flags
& O_EXCL
)
240 return -EBUSY
; /* No exclusive opens */
241 if (!drm_cpu_valid())
243 if (dev
->switch_power_state
!= DRM_SWITCH_POWER_ON
)
246 DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current
), minor_id
);
248 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
252 filp
->private_data
= priv
;
254 priv
->uid
= current_euid();
255 priv
->pid
= get_pid(task_pid(current
));
256 priv
->minor
= idr_find(&drm_minors_idr
, minor_id
);
262 priv
->ioctl_count
= 0;
263 /* for compatibility root is always authenticated */
264 priv
->authenticated
= capable(CAP_SYS_ADMIN
);
265 priv
->lock_count
= 0;
267 INIT_LIST_HEAD(&priv
->lhead
);
268 INIT_LIST_HEAD(&priv
->fbs
);
269 mutex_init(&priv
->fbs_lock
);
270 INIT_LIST_HEAD(&priv
->event_list
);
271 init_waitqueue_head(&priv
->event_wait
);
272 priv
->event_space
= 4096; /* set aside 4k for event buffer */
274 if (dev
->driver
->driver_features
& DRIVER_GEM
)
275 drm_gem_open(dev
, priv
);
277 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
278 drm_prime_init_file_private(&priv
->prime
);
280 if (dev
->driver
->open
) {
281 ret
= dev
->driver
->open(dev
, priv
);
283 goto out_prime_destroy
;
287 /* if there is no current master make this fd it */
288 mutex_lock(&dev
->struct_mutex
);
289 if (!priv
->minor
->master
) {
290 /* create a new master */
291 priv
->minor
->master
= drm_master_create(priv
->minor
);
292 if (!priv
->minor
->master
) {
293 mutex_unlock(&dev
->struct_mutex
);
299 /* take another reference for the copy in the local file priv */
300 priv
->master
= drm_master_get(priv
->minor
->master
);
302 priv
->authenticated
= 1;
304 mutex_unlock(&dev
->struct_mutex
);
305 if (dev
->driver
->master_create
) {
306 ret
= dev
->driver
->master_create(dev
, priv
->master
);
308 mutex_lock(&dev
->struct_mutex
);
309 /* drop both references if this fails */
310 drm_master_put(&priv
->minor
->master
);
311 drm_master_put(&priv
->master
);
312 mutex_unlock(&dev
->struct_mutex
);
316 mutex_lock(&dev
->struct_mutex
);
317 if (dev
->driver
->master_set
) {
318 ret
= dev
->driver
->master_set(dev
, priv
, true);
320 /* drop both references if this fails */
321 drm_master_put(&priv
->minor
->master
);
322 drm_master_put(&priv
->master
);
323 mutex_unlock(&dev
->struct_mutex
);
327 mutex_unlock(&dev
->struct_mutex
);
329 /* get a reference to the master */
330 priv
->master
= drm_master_get(priv
->minor
->master
);
331 mutex_unlock(&dev
->struct_mutex
);
334 mutex_lock(&dev
->struct_mutex
);
335 list_add(&priv
->lhead
, &dev
->filelist
);
336 mutex_unlock(&dev
->struct_mutex
);
343 struct pci_dev
*pci_dev
;
344 pci_dev
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, NULL
);
346 dev
->hose
= pci_dev
->sysdata
;
347 pci_dev_put(pci_dev
);
350 struct pci_bus
*b
= pci_bus_b(pci_root_buses
.next
);
352 dev
->hose
= b
->sysdata
;
360 if (dev
->driver
->postclose
)
361 dev
->driver
->postclose(dev
, priv
);
363 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
364 drm_prime_destroy_file_private(&priv
->prime
);
365 if (dev
->driver
->driver_features
& DRIVER_GEM
)
366 drm_gem_release(dev
, priv
);
370 filp
->private_data
= NULL
;
374 static void drm_master_release(struct drm_device
*dev
, struct file
*filp
)
376 struct drm_file
*file_priv
= filp
->private_data
;
378 if (drm_i_have_hw_lock(dev
, file_priv
)) {
379 DRM_DEBUG("File %p released, freeing lock for context %d\n",
380 filp
, _DRM_LOCKING_CONTEXT(file_priv
->master
->lock
.hw_lock
->lock
));
381 drm_lock_free(&file_priv
->master
->lock
,
382 _DRM_LOCKING_CONTEXT(file_priv
->master
->lock
.hw_lock
->lock
));
386 static void drm_events_release(struct drm_file
*file_priv
)
388 struct drm_device
*dev
= file_priv
->minor
->dev
;
389 struct drm_pending_event
*e
, *et
;
390 struct drm_pending_vblank_event
*v
, *vt
;
393 spin_lock_irqsave(&dev
->event_lock
, flags
);
395 /* Remove pending flips */
396 list_for_each_entry_safe(v
, vt
, &dev
->vblank_event_list
, base
.link
)
397 if (v
->base
.file_priv
== file_priv
) {
398 list_del(&v
->base
.link
);
399 drm_vblank_put(dev
, v
->pipe
);
400 v
->base
.destroy(&v
->base
);
403 /* Remove unconsumed events */
404 list_for_each_entry_safe(e
, et
, &file_priv
->event_list
, link
)
407 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
413 * \param inode device inode
414 * \param file_priv DRM file private.
415 * \return zero on success or a negative number on failure.
417 * If the hardware lock is held then free it, and take it again for the kernel
418 * context since it's necessary to reclaim buffers. Unlink the file private
419 * data from its list and free it. Decreases the open count and if it reaches
420 * zero calls drm_lastclose().
422 int drm_release(struct inode
*inode
, struct file
*filp
)
424 struct drm_file
*file_priv
= filp
->private_data
;
425 struct drm_device
*dev
= file_priv
->minor
->dev
;
428 mutex_lock(&drm_global_mutex
);
430 DRM_DEBUG("open_count = %d\n", dev
->open_count
);
432 if (dev
->driver
->preclose
)
433 dev
->driver
->preclose(dev
, file_priv
);
435 /* ========================================================
436 * Begin inline drm_release
439 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
440 task_pid_nr(current
),
441 (long)old_encode_dev(file_priv
->minor
->device
),
444 /* Release any auth tokens that might point to this file_priv,
445 (do that under the drm_global_mutex) */
446 if (file_priv
->magic
)
447 (void) drm_remove_magic(file_priv
->master
, file_priv
->magic
);
449 /* if the master has gone away we can't do anything with the lock */
450 if (file_priv
->minor
->master
)
451 drm_master_release(dev
, filp
);
453 if (drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
454 drm_core_reclaim_buffers(dev
, file_priv
);
456 drm_events_release(file_priv
);
458 if (dev
->driver
->driver_features
& DRIVER_MODESET
)
459 drm_fb_release(file_priv
);
461 if (dev
->driver
->driver_features
& DRIVER_GEM
)
462 drm_gem_release(dev
, file_priv
);
464 drm_legacy_ctxbitmap_release(dev
, file_priv
);
466 mutex_lock(&dev
->struct_mutex
);
468 if (file_priv
->is_master
) {
469 struct drm_master
*master
= file_priv
->master
;
470 struct drm_file
*temp
;
471 list_for_each_entry(temp
, &dev
->filelist
, lhead
) {
472 if ((temp
->master
== file_priv
->master
) &&
474 temp
->authenticated
= 0;
478 * Since the master is disappearing, so is the
479 * possibility to lock.
482 if (master
->lock
.hw_lock
) {
483 if (dev
->sigdata
.lock
== master
->lock
.hw_lock
)
484 dev
->sigdata
.lock
= NULL
;
485 master
->lock
.hw_lock
= NULL
;
486 master
->lock
.file_priv
= NULL
;
487 wake_up_interruptible_all(&master
->lock
.lock_queue
);
490 if (file_priv
->minor
->master
== file_priv
->master
) {
491 /* drop the reference held my the minor */
492 if (dev
->driver
->master_drop
)
493 dev
->driver
->master_drop(dev
, file_priv
, true);
494 drm_master_put(&file_priv
->minor
->master
);
498 BUG_ON(dev
->dev_mapping
== NULL
);
499 iput(container_of(dev
->dev_mapping
, struct inode
, i_data
));
501 /* drop the reference held my the file priv */
502 drm_master_put(&file_priv
->master
);
503 file_priv
->is_master
= 0;
504 list_del(&file_priv
->lhead
);
505 mutex_unlock(&dev
->struct_mutex
);
507 if (dev
->driver
->postclose
)
508 dev
->driver
->postclose(dev
, file_priv
);
510 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
511 drm_prime_destroy_file_private(&file_priv
->prime
);
513 put_pid(file_priv
->pid
);
516 /* ========================================================
517 * End inline drm_release
520 atomic_inc(&dev
->counts
[_DRM_STAT_CLOSES
]);
521 if (!--dev
->open_count
) {
522 if (atomic_read(&dev
->ioctl_count
)) {
523 DRM_ERROR("Device busy: %d\n",
524 atomic_read(&dev
->ioctl_count
));
527 retcode
= drm_lastclose(dev
);
528 if (drm_device_is_unplugged(dev
))
531 mutex_unlock(&drm_global_mutex
);
535 EXPORT_SYMBOL(drm_release
);
538 drm_dequeue_event(struct drm_file
*file_priv
,
539 size_t total
, size_t max
, struct drm_pending_event
**out
)
541 struct drm_device
*dev
= file_priv
->minor
->dev
;
542 struct drm_pending_event
*e
;
546 spin_lock_irqsave(&dev
->event_lock
, flags
);
549 if (list_empty(&file_priv
->event_list
))
551 e
= list_first_entry(&file_priv
->event_list
,
552 struct drm_pending_event
, link
);
553 if (e
->event
->length
+ total
> max
)
556 file_priv
->event_space
+= e
->event
->length
;
562 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
566 ssize_t
drm_read(struct file
*filp
, char __user
*buffer
,
567 size_t count
, loff_t
*offset
)
569 struct drm_file
*file_priv
= filp
->private_data
;
570 struct drm_pending_event
*e
;
574 ret
= wait_event_interruptible(file_priv
->event_wait
,
575 !list_empty(&file_priv
->event_list
));
580 while (drm_dequeue_event(file_priv
, total
, count
, &e
)) {
581 if (copy_to_user(buffer
+ total
,
582 e
->event
, e
->event
->length
)) {
587 total
+= e
->event
->length
;
593 EXPORT_SYMBOL(drm_read
);
595 unsigned int drm_poll(struct file
*filp
, struct poll_table_struct
*wait
)
597 struct drm_file
*file_priv
= filp
->private_data
;
598 unsigned int mask
= 0;
600 poll_wait(filp
, &file_priv
->event_wait
, wait
);
602 if (!list_empty(&file_priv
->event_list
))
603 mask
|= POLLIN
| POLLRDNORM
;
607 EXPORT_SYMBOL(drm_poll
);
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