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 */
43 DEFINE_MUTEX(drm_global_mutex
);
44 EXPORT_SYMBOL(drm_global_mutex
);
46 static int drm_open_helper(struct file
*filp
, struct drm_minor
*minor
);
48 static int drm_setup(struct drm_device
* dev
)
52 if (dev
->driver
->firstopen
&&
53 !drm_core_check_feature(dev
, DRIVER_MODESET
)) {
54 ret
= dev
->driver
->firstopen(dev
);
59 ret
= drm_legacy_dma_setup(dev
);
71 * \param inode device inode
72 * \param filp file pointer.
73 * \return zero on success or a negative number on failure.
75 * Searches the DRM device with the same minor number, calls open_helper(), and
76 * increments the device open count. If the open count was previous at zero,
77 * i.e., it's the first that the device is open, then calls setup().
79 int drm_open(struct inode
*inode
, struct file
*filp
)
81 struct drm_device
*dev
;
82 struct drm_minor
*minor
;
86 minor
= drm_minor_acquire(iminor(inode
));
88 return PTR_ERR(minor
);
91 if (!dev
->open_count
++)
94 /* share address_space across all char-devs of a single device */
95 filp
->f_mapping
= dev
->anon_inode
->i_mapping
;
97 retcode
= drm_open_helper(filp
, minor
);
101 retcode
= drm_setup(dev
);
109 drm_minor_release(minor
);
112 EXPORT_SYMBOL(drm_open
);
115 * File \c open operation.
117 * \param inode device inode.
118 * \param filp file pointer.
120 * Puts the dev->fops corresponding to the device minor number into
121 * \p filp, call the \c open method, and restore the file operations.
123 int drm_stub_open(struct inode
*inode
, struct file
*filp
)
125 struct drm_device
*dev
;
126 struct drm_minor
*minor
;
128 const struct file_operations
*new_fops
;
132 mutex_lock(&drm_global_mutex
);
133 minor
= drm_minor_acquire(iminor(inode
));
138 new_fops
= fops_get(dev
->driver
->fops
);
142 replace_fops(filp
, new_fops
);
143 if (filp
->f_op
->open
)
144 err
= filp
->f_op
->open(inode
, filp
);
147 drm_minor_release(minor
);
149 mutex_unlock(&drm_global_mutex
);
154 * Check whether DRI will run on this CPU.
156 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
158 static int drm_cpu_valid(void)
160 #if defined(__i386__)
161 if (boot_cpu_data
.x86
== 3)
162 return 0; /* No cmpxchg on a 386 */
164 #if defined(__sparc__) && !defined(__sparc_v9__)
165 return 0; /* No cmpxchg before v9 sparc. */
171 * Called whenever a process opens /dev/drm.
173 * \param filp file pointer.
174 * \param minor acquired minor-object.
175 * \return zero on success or a negative number on failure.
177 * Creates and initializes a drm_file structure for the file private data in \p
178 * filp and add it into the double linked list in \p dev.
180 static int drm_open_helper(struct file
*filp
, struct drm_minor
*minor
)
182 struct drm_device
*dev
= minor
->dev
;
183 struct drm_file
*priv
;
186 if (filp
->f_flags
& O_EXCL
)
187 return -EBUSY
; /* No exclusive opens */
188 if (!drm_cpu_valid())
190 if (dev
->switch_power_state
!= DRM_SWITCH_POWER_ON
&& dev
->switch_power_state
!= DRM_SWITCH_POWER_DYNAMIC_OFF
)
193 DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current
), minor
->index
);
195 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
199 filp
->private_data
= priv
;
201 priv
->uid
= current_euid();
202 priv
->pid
= get_pid(task_pid(current
));
205 /* for compatibility root is always authenticated */
206 priv
->always_authenticated
= capable(CAP_SYS_ADMIN
);
207 priv
->authenticated
= priv
->always_authenticated
;
208 priv
->lock_count
= 0;
210 INIT_LIST_HEAD(&priv
->lhead
);
211 INIT_LIST_HEAD(&priv
->fbs
);
212 mutex_init(&priv
->fbs_lock
);
213 INIT_LIST_HEAD(&priv
->event_list
);
214 init_waitqueue_head(&priv
->event_wait
);
215 priv
->event_space
= 4096; /* set aside 4k for event buffer */
217 if (dev
->driver
->driver_features
& DRIVER_GEM
)
218 drm_gem_open(dev
, priv
);
220 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
221 drm_prime_init_file_private(&priv
->prime
);
223 if (dev
->driver
->open
) {
224 ret
= dev
->driver
->open(dev
, priv
);
226 goto out_prime_destroy
;
229 /* if there is no current master make this fd it, but do not create
230 * any master object for render clients */
231 mutex_lock(&dev
->master_mutex
);
232 if (drm_is_primary_client(priv
) && !priv
->minor
->master
) {
233 /* create a new master */
234 priv
->minor
->master
= drm_master_create(priv
->minor
);
235 if (!priv
->minor
->master
) {
241 /* take another reference for the copy in the local file priv */
242 priv
->master
= drm_master_get(priv
->minor
->master
);
243 priv
->authenticated
= 1;
245 if (dev
->driver
->master_create
) {
246 ret
= dev
->driver
->master_create(dev
, priv
->master
);
248 /* drop both references if this fails */
249 drm_master_put(&priv
->minor
->master
);
250 drm_master_put(&priv
->master
);
254 if (dev
->driver
->master_set
) {
255 ret
= dev
->driver
->master_set(dev
, priv
, true);
257 /* drop both references if this fails */
258 drm_master_put(&priv
->minor
->master
);
259 drm_master_put(&priv
->master
);
263 } else if (drm_is_primary_client(priv
)) {
264 /* get a reference to the master */
265 priv
->master
= drm_master_get(priv
->minor
->master
);
267 mutex_unlock(&dev
->master_mutex
);
269 mutex_lock(&dev
->struct_mutex
);
270 list_add(&priv
->lhead
, &dev
->filelist
);
271 mutex_unlock(&dev
->struct_mutex
);
278 struct pci_dev
*pci_dev
;
279 pci_dev
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, NULL
);
281 dev
->hose
= pci_dev
->sysdata
;
282 pci_dev_put(pci_dev
);
285 struct pci_bus
*b
= list_entry(pci_root_buses
.next
,
286 struct pci_bus
, node
);
288 dev
->hose
= b
->sysdata
;
296 mutex_unlock(&dev
->master_mutex
);
297 if (dev
->driver
->postclose
)
298 dev
->driver
->postclose(dev
, priv
);
300 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
301 drm_prime_destroy_file_private(&priv
->prime
);
302 if (dev
->driver
->driver_features
& DRIVER_GEM
)
303 drm_gem_release(dev
, priv
);
306 filp
->private_data
= NULL
;
310 static void drm_master_release(struct drm_device
*dev
, struct file
*filp
)
312 struct drm_file
*file_priv
= filp
->private_data
;
314 if (drm_i_have_hw_lock(dev
, file_priv
)) {
315 DRM_DEBUG("File %p released, freeing lock for context %d\n",
316 filp
, _DRM_LOCKING_CONTEXT(file_priv
->master
->lock
.hw_lock
->lock
));
317 drm_lock_free(&file_priv
->master
->lock
,
318 _DRM_LOCKING_CONTEXT(file_priv
->master
->lock
.hw_lock
->lock
));
322 static void drm_events_release(struct drm_file
*file_priv
)
324 struct drm_device
*dev
= file_priv
->minor
->dev
;
325 struct drm_pending_event
*e
, *et
;
326 struct drm_pending_vblank_event
*v
, *vt
;
329 spin_lock_irqsave(&dev
->event_lock
, flags
);
331 /* Remove pending flips */
332 list_for_each_entry_safe(v
, vt
, &dev
->vblank_event_list
, base
.link
)
333 if (v
->base
.file_priv
== file_priv
) {
334 list_del(&v
->base
.link
);
335 drm_vblank_put(dev
, v
->pipe
);
336 v
->base
.destroy(&v
->base
);
339 /* Remove unconsumed events */
340 list_for_each_entry_safe(e
, et
, &file_priv
->event_list
, link
) {
345 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
349 * drm_legacy_dev_reinit
351 * Reinitializes a legacy/ums drm device in it's lastclose function.
353 static void drm_legacy_dev_reinit(struct drm_device
*dev
)
355 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
358 dev
->sigdata
.lock
= NULL
;
360 dev
->context_flag
= 0;
361 dev
->last_context
= 0;
366 * Take down the DRM device.
368 * \param dev DRM device structure.
370 * Frees every resource in \p dev.
374 int drm_lastclose(struct drm_device
* dev
)
376 struct drm_vma_entry
*vma
, *vma_temp
;
380 if (dev
->driver
->lastclose
)
381 dev
->driver
->lastclose(dev
);
382 DRM_DEBUG("driver lastclose completed\n");
384 if (dev
->irq_enabled
&& !drm_core_check_feature(dev
, DRIVER_MODESET
))
385 drm_irq_uninstall(dev
);
387 mutex_lock(&dev
->struct_mutex
);
391 drm_legacy_sg_cleanup(dev
);
393 /* Clear vma list (only built for debugging) */
394 list_for_each_entry_safe(vma
, vma_temp
, &dev
->vmalist
, head
) {
395 list_del(&vma
->head
);
399 drm_legacy_dma_takedown(dev
);
401 mutex_unlock(&dev
->struct_mutex
);
403 drm_legacy_dev_reinit(dev
);
405 DRM_DEBUG("lastclose completed\n");
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_minor
*minor
= file_priv
->minor
;
425 struct drm_device
*dev
= 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
->kdev
->devt
),
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 mutex_lock(&dev
->ctxlist_mutex
);
465 if (!list_empty(&dev
->ctxlist
)) {
466 struct drm_ctx_list
*pos
, *n
;
468 list_for_each_entry_safe(pos
, n
, &dev
->ctxlist
, head
) {
469 if (pos
->tag
== file_priv
&&
470 pos
->handle
!= DRM_KERNEL_CONTEXT
) {
471 if (dev
->driver
->context_dtor
)
472 dev
->driver
->context_dtor(dev
,
475 drm_ctxbitmap_free(dev
, pos
->handle
);
477 list_del(&pos
->head
);
482 mutex_unlock(&dev
->ctxlist_mutex
);
484 mutex_lock(&dev
->master_mutex
);
486 if (file_priv
->is_master
) {
487 struct drm_master
*master
= file_priv
->master
;
488 struct drm_file
*temp
;
490 mutex_lock(&dev
->struct_mutex
);
491 list_for_each_entry(temp
, &dev
->filelist
, lhead
) {
492 if ((temp
->master
== file_priv
->master
) &&
494 temp
->authenticated
= temp
->always_authenticated
;
498 * Since the master is disappearing, so is the
499 * possibility to lock.
502 if (master
->lock
.hw_lock
) {
503 if (dev
->sigdata
.lock
== master
->lock
.hw_lock
)
504 dev
->sigdata
.lock
= NULL
;
505 master
->lock
.hw_lock
= NULL
;
506 master
->lock
.file_priv
= NULL
;
507 wake_up_interruptible_all(&master
->lock
.lock_queue
);
509 mutex_unlock(&dev
->struct_mutex
);
511 if (file_priv
->minor
->master
== file_priv
->master
) {
512 /* drop the reference held my the minor */
513 if (dev
->driver
->master_drop
)
514 dev
->driver
->master_drop(dev
, file_priv
, true);
515 drm_master_put(&file_priv
->minor
->master
);
519 /* drop the master reference held by the file priv */
520 if (file_priv
->master
)
521 drm_master_put(&file_priv
->master
);
522 file_priv
->is_master
= 0;
523 mutex_unlock(&dev
->master_mutex
);
525 mutex_lock(&dev
->struct_mutex
);
526 list_del(&file_priv
->lhead
);
527 mutex_unlock(&dev
->struct_mutex
);
529 if (dev
->driver
->postclose
)
530 dev
->driver
->postclose(dev
, file_priv
);
533 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
534 drm_prime_destroy_file_private(&file_priv
->prime
);
536 put_pid(file_priv
->pid
);
539 /* ========================================================
540 * End inline drm_release
543 if (!--dev
->open_count
) {
544 retcode
= drm_lastclose(dev
);
545 if (drm_device_is_unplugged(dev
))
548 mutex_unlock(&drm_global_mutex
);
550 drm_minor_release(minor
);
554 EXPORT_SYMBOL(drm_release
);
557 drm_dequeue_event(struct drm_file
*file_priv
,
558 size_t total
, size_t max
, struct drm_pending_event
**out
)
560 struct drm_device
*dev
= file_priv
->minor
->dev
;
561 struct drm_pending_event
*e
;
565 spin_lock_irqsave(&dev
->event_lock
, flags
);
568 if (list_empty(&file_priv
->event_list
))
570 e
= list_first_entry(&file_priv
->event_list
,
571 struct drm_pending_event
, link
);
572 if (e
->event
->length
+ total
> max
)
575 file_priv
->event_space
+= e
->event
->length
;
581 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
585 ssize_t
drm_read(struct file
*filp
, char __user
*buffer
,
586 size_t count
, loff_t
*offset
)
588 struct drm_file
*file_priv
= filp
->private_data
;
589 struct drm_pending_event
*e
;
593 ret
= wait_event_interruptible(file_priv
->event_wait
,
594 !list_empty(&file_priv
->event_list
));
599 while (drm_dequeue_event(file_priv
, total
, count
, &e
)) {
600 if (copy_to_user(buffer
+ total
,
601 e
->event
, e
->event
->length
)) {
606 total
+= e
->event
->length
;
612 EXPORT_SYMBOL(drm_read
);
614 unsigned int drm_poll(struct file
*filp
, struct poll_table_struct
*wait
)
616 struct drm_file
*file_priv
= filp
->private_data
;
617 unsigned int mask
= 0;
619 poll_wait(filp
, &file_priv
->event_wait
, wait
);
621 if (!list_empty(&file_priv
->event_list
))
622 mask
|= POLLIN
| POLLRDNORM
;
626 EXPORT_SYMBOL(drm_poll
);