2 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
4 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
7 * Author Rickard E. (Rik) Faith <faith@valinux.com>
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice (including the next
17 * paragraph) shall be included in all copies or substantial portions of the
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
29 #include <linux/debugfs.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/mount.h>
34 #include <linux/slab.h>
36 #include <drm/drm_core.h>
37 #include "drm_legacy.h"
38 #include "drm_internal.h"
41 * drm_debug: Enable debug output.
42 * Bitmask of DRM_UT_x. See include/drm/drmP.h for details.
44 unsigned int drm_debug
= 0;
45 EXPORT_SYMBOL(drm_debug
);
47 MODULE_AUTHOR(CORE_AUTHOR
);
48 MODULE_DESCRIPTION(CORE_DESC
);
49 MODULE_LICENSE("GPL and additional rights");
50 MODULE_PARM_DESC(debug
, "Enable debug output, where each bit enables a debug category.\n"
51 "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n"
52 "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n"
53 "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n"
54 "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n"
55 "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n"
56 "\t\tBit 5 (0x20) will enable VBL messages (vblank code)");
57 module_param_named(debug
, drm_debug
, int, 0600);
59 static DEFINE_SPINLOCK(drm_minor_lock
);
60 static struct idr drm_minors_idr
;
62 static struct dentry
*drm_debugfs_root
;
64 void drm_err(const char *format
, ...)
69 va_start(args
, format
);
74 printk(KERN_ERR
"[" DRM_NAME
":%ps] *ERROR* %pV",
75 __builtin_return_address(0), &vaf
);
79 EXPORT_SYMBOL(drm_err
);
81 void drm_ut_debug_printk(const char *function_name
, const char *format
, ...)
86 va_start(args
, format
);
90 printk(KERN_DEBUG
"[" DRM_NAME
":%s] %pV", function_name
, &vaf
);
94 EXPORT_SYMBOL(drm_ut_debug_printk
);
96 struct drm_master
*drm_master_create(struct drm_minor
*minor
)
98 struct drm_master
*master
;
100 master
= kzalloc(sizeof(*master
), GFP_KERNEL
);
104 kref_init(&master
->refcount
);
105 spin_lock_init(&master
->lock
.spinlock
);
106 init_waitqueue_head(&master
->lock
.lock_queue
);
107 idr_init(&master
->magic_map
);
108 master
->minor
= minor
;
113 struct drm_master
*drm_master_get(struct drm_master
*master
)
115 kref_get(&master
->refcount
);
118 EXPORT_SYMBOL(drm_master_get
);
120 static void drm_master_destroy(struct kref
*kref
)
122 struct drm_master
*master
= container_of(kref
, struct drm_master
, refcount
);
123 struct drm_device
*dev
= master
->minor
->dev
;
124 struct drm_map_list
*r_list
, *list_temp
;
126 mutex_lock(&dev
->struct_mutex
);
127 if (dev
->driver
->master_destroy
)
128 dev
->driver
->master_destroy(dev
, master
);
130 list_for_each_entry_safe(r_list
, list_temp
, &dev
->maplist
, head
) {
131 if (r_list
->master
== master
) {
132 drm_legacy_rmmap_locked(dev
, r_list
->map
);
136 mutex_unlock(&dev
->struct_mutex
);
138 idr_destroy(&master
->magic_map
);
139 kfree(master
->unique
);
143 void drm_master_put(struct drm_master
**master
)
145 kref_put(&(*master
)->refcount
, drm_master_destroy
);
148 EXPORT_SYMBOL(drm_master_put
);
150 int drm_setmaster_ioctl(struct drm_device
*dev
, void *data
,
151 struct drm_file
*file_priv
)
155 mutex_lock(&dev
->master_mutex
);
156 if (file_priv
->is_master
)
159 if (file_priv
->minor
->master
) {
164 if (!file_priv
->master
) {
169 if (!file_priv
->allowed_master
) {
170 ret
= drm_new_set_master(dev
, file_priv
);
174 file_priv
->minor
->master
= drm_master_get(file_priv
->master
);
175 file_priv
->is_master
= 1;
176 if (dev
->driver
->master_set
) {
177 ret
= dev
->driver
->master_set(dev
, file_priv
, false);
178 if (unlikely(ret
!= 0)) {
179 file_priv
->is_master
= 0;
180 drm_master_put(&file_priv
->minor
->master
);
185 mutex_unlock(&dev
->master_mutex
);
189 int drm_dropmaster_ioctl(struct drm_device
*dev
, void *data
,
190 struct drm_file
*file_priv
)
194 mutex_lock(&dev
->master_mutex
);
195 if (!file_priv
->is_master
)
198 if (!file_priv
->minor
->master
)
202 if (dev
->driver
->master_drop
)
203 dev
->driver
->master_drop(dev
, file_priv
, false);
204 drm_master_put(&file_priv
->minor
->master
);
205 file_priv
->is_master
= 0;
208 mutex_unlock(&dev
->master_mutex
);
214 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
215 * of them is represented by a drm_minor object. Depending on the capabilities
216 * of the device-driver, different interfaces are registered.
218 * Minors can be accessed via dev->$minor_name. This pointer is either
219 * NULL or a valid drm_minor pointer and stays valid as long as the device is
220 * valid. This means, DRM minors have the same life-time as the underlying
221 * device. However, this doesn't mean that the minor is active. Minors are
222 * registered and unregistered dynamically according to device-state.
225 static struct drm_minor
**drm_minor_get_slot(struct drm_device
*dev
,
229 case DRM_MINOR_LEGACY
:
230 return &dev
->primary
;
231 case DRM_MINOR_RENDER
:
233 case DRM_MINOR_CONTROL
:
234 return &dev
->control
;
240 static int drm_minor_alloc(struct drm_device
*dev
, unsigned int type
)
242 struct drm_minor
*minor
;
246 minor
= kzalloc(sizeof(*minor
), GFP_KERNEL
);
253 idr_preload(GFP_KERNEL
);
254 spin_lock_irqsave(&drm_minor_lock
, flags
);
255 r
= idr_alloc(&drm_minors_idr
,
260 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
268 minor
->kdev
= drm_sysfs_minor_alloc(minor
);
269 if (IS_ERR(minor
->kdev
)) {
270 r
= PTR_ERR(minor
->kdev
);
274 *drm_minor_get_slot(dev
, type
) = minor
;
278 spin_lock_irqsave(&drm_minor_lock
, flags
);
279 idr_remove(&drm_minors_idr
, minor
->index
);
280 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
286 static void drm_minor_free(struct drm_device
*dev
, unsigned int type
)
288 struct drm_minor
**slot
, *minor
;
291 slot
= drm_minor_get_slot(dev
, type
);
296 put_device(minor
->kdev
);
298 spin_lock_irqsave(&drm_minor_lock
, flags
);
299 idr_remove(&drm_minors_idr
, minor
->index
);
300 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
306 static int drm_minor_register(struct drm_device
*dev
, unsigned int type
)
308 struct drm_minor
*minor
;
314 minor
= *drm_minor_get_slot(dev
, type
);
318 ret
= drm_debugfs_init(minor
, minor
->index
, drm_debugfs_root
);
320 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
324 ret
= device_add(minor
->kdev
);
328 /* replace NULL with @minor so lookups will succeed from now on */
329 spin_lock_irqsave(&drm_minor_lock
, flags
);
330 idr_replace(&drm_minors_idr
, minor
, minor
->index
);
331 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
333 DRM_DEBUG("new minor registered %d\n", minor
->index
);
337 drm_debugfs_cleanup(minor
);
341 static void drm_minor_unregister(struct drm_device
*dev
, unsigned int type
)
343 struct drm_minor
*minor
;
346 minor
= *drm_minor_get_slot(dev
, type
);
347 if (!minor
|| !device_is_registered(minor
->kdev
))
350 /* replace @minor with NULL so lookups will fail from now on */
351 spin_lock_irqsave(&drm_minor_lock
, flags
);
352 idr_replace(&drm_minors_idr
, NULL
, minor
->index
);
353 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
355 device_del(minor
->kdev
);
356 dev_set_drvdata(minor
->kdev
, NULL
); /* safety belt */
357 drm_debugfs_cleanup(minor
);
361 * drm_minor_acquire - Acquire a DRM minor
362 * @minor_id: Minor ID of the DRM-minor
364 * Looks up the given minor-ID and returns the respective DRM-minor object. The
365 * refence-count of the underlying device is increased so you must release this
366 * object with drm_minor_release().
368 * As long as you hold this minor, it is guaranteed that the object and the
369 * minor->dev pointer will stay valid! However, the device may get unplugged and
370 * unregistered while you hold the minor.
373 * Pointer to minor-object with increased device-refcount, or PTR_ERR on
376 struct drm_minor
*drm_minor_acquire(unsigned int minor_id
)
378 struct drm_minor
*minor
;
381 spin_lock_irqsave(&drm_minor_lock
, flags
);
382 minor
= idr_find(&drm_minors_idr
, minor_id
);
384 drm_dev_ref(minor
->dev
);
385 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
388 return ERR_PTR(-ENODEV
);
389 } else if (drm_device_is_unplugged(minor
->dev
)) {
390 drm_dev_unref(minor
->dev
);
391 return ERR_PTR(-ENODEV
);
398 * drm_minor_release - Release DRM minor
399 * @minor: Pointer to DRM minor object
401 * Release a minor that was previously acquired via drm_minor_acquire().
403 void drm_minor_release(struct drm_minor
*minor
)
405 drm_dev_unref(minor
->dev
);
409 * DOC: driver instance overview
411 * A device instance for a drm driver is represented by struct &drm_device. This
412 * is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
413 * callbacks implemented by the driver. The driver then needs to initialize all
414 * the various subsystems for the drm device like memory management, vblank
415 * handling, modesetting support and intial output configuration plus obviously
416 * initialize all the corresponding hardware bits. An important part of this is
417 * also calling drm_dev_set_unique() to set the userspace-visible unique name of
418 * this device instance. Finally when everything is up and running and ready for
419 * userspace the device instance can be published using drm_dev_register().
421 * There is also deprecated support for initalizing device instances using
422 * bus-specific helpers and the ->load() callback. But due to
423 * backwards-compatibility needs the device instance have to be published too
424 * early, which requires unpretty global locking to make safe and is therefore
425 * only support for existing drivers not yet converted to the new scheme.
427 * When cleaning up a device instance everything needs to be done in reverse:
428 * First unpublish the device instance with drm_dev_unregister(). Then clean up
429 * any other resources allocated at device initialization and drop the driver's
430 * reference to &drm_device using drm_dev_unref().
432 * Note that the lifetime rules for &drm_device instance has still a lot of
433 * historical baggage. Hence use the reference counting provided by
434 * drm_dev_ref() and drm_dev_unref() only carefully.
436 * Also note that embedding of &drm_device is currently not (yet) supported (but
437 * it would be easy to add). Drivers can store driver-private data in the
438 * dev_priv field of &drm_device.
442 * drm_put_dev - Unregister and release a DRM device
445 * Called at module unload time or when a PCI device is unplugged.
447 * Cleans up all DRM device, calling drm_lastclose().
449 * Note: Use of this function is deprecated. It will eventually go away
450 * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
451 * instead to make sure that the device isn't userspace accessible any more
452 * while teardown is in progress, ensuring that userspace can't access an
453 * inconsistent state.
455 void drm_put_dev(struct drm_device
*dev
)
460 DRM_ERROR("cleanup called no dev\n");
464 drm_dev_unregister(dev
);
467 EXPORT_SYMBOL(drm_put_dev
);
469 void drm_unplug_dev(struct drm_device
*dev
)
471 /* for a USB device */
472 drm_minor_unregister(dev
, DRM_MINOR_LEGACY
);
473 drm_minor_unregister(dev
, DRM_MINOR_RENDER
);
474 drm_minor_unregister(dev
, DRM_MINOR_CONTROL
);
476 mutex_lock(&drm_global_mutex
);
478 drm_device_set_unplugged(dev
);
480 if (dev
->open_count
== 0) {
483 mutex_unlock(&drm_global_mutex
);
485 EXPORT_SYMBOL(drm_unplug_dev
);
489 * We want to be able to allocate our own "struct address_space" to control
490 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
491 * stand-alone address_space objects, so we need an underlying inode. As there
492 * is no way to allocate an independent inode easily, we need a fake internal
495 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
496 * frees it again. You are allowed to use iget() and iput() to get references to
497 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
498 * drm_fs_inode_free() call (which does not have to be the last iput()).
499 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
500 * between multiple inode-users. You could, technically, call
501 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
502 * iput(), but this way you'd end up with a new vfsmount for each inode.
505 static int drm_fs_cnt
;
506 static struct vfsmount
*drm_fs_mnt
;
508 static const struct dentry_operations drm_fs_dops
= {
509 .d_dname
= simple_dname
,
512 static const struct super_operations drm_fs_sops
= {
513 .statfs
= simple_statfs
,
516 static struct dentry
*drm_fs_mount(struct file_system_type
*fs_type
, int flags
,
517 const char *dev_name
, void *data
)
519 return mount_pseudo(fs_type
,
526 static struct file_system_type drm_fs_type
= {
528 .owner
= THIS_MODULE
,
529 .mount
= drm_fs_mount
,
530 .kill_sb
= kill_anon_super
,
533 static struct inode
*drm_fs_inode_new(void)
538 r
= simple_pin_fs(&drm_fs_type
, &drm_fs_mnt
, &drm_fs_cnt
);
540 DRM_ERROR("Cannot mount pseudo fs: %d\n", r
);
544 inode
= alloc_anon_inode(drm_fs_mnt
->mnt_sb
);
546 simple_release_fs(&drm_fs_mnt
, &drm_fs_cnt
);
551 static void drm_fs_inode_free(struct inode
*inode
)
555 simple_release_fs(&drm_fs_mnt
, &drm_fs_cnt
);
560 * drm_dev_alloc - Allocate new DRM device
561 * @driver: DRM driver to allocate device for
562 * @parent: Parent device object
564 * Allocate and initialize a new DRM device. No device registration is done.
565 * Call drm_dev_register() to advertice the device to user space and register it
566 * with other core subsystems. This should be done last in the device
567 * initialization sequence to make sure userspace can't access an inconsistent
570 * The initial ref-count of the object is 1. Use drm_dev_ref() and
571 * drm_dev_unref() to take and drop further ref-counts.
573 * Note that for purely virtual devices @parent can be NULL.
576 * Pointer to new DRM device, or NULL if out of memory.
578 struct drm_device
*drm_dev_alloc(struct drm_driver
*driver
,
579 struct device
*parent
)
581 struct drm_device
*dev
;
584 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
588 kref_init(&dev
->ref
);
590 dev
->driver
= driver
;
592 INIT_LIST_HEAD(&dev
->filelist
);
593 INIT_LIST_HEAD(&dev
->ctxlist
);
594 INIT_LIST_HEAD(&dev
->vmalist
);
595 INIT_LIST_HEAD(&dev
->maplist
);
596 INIT_LIST_HEAD(&dev
->vblank_event_list
);
598 spin_lock_init(&dev
->buf_lock
);
599 spin_lock_init(&dev
->event_lock
);
600 mutex_init(&dev
->struct_mutex
);
601 mutex_init(&dev
->ctxlist_mutex
);
602 mutex_init(&dev
->master_mutex
);
604 dev
->anon_inode
= drm_fs_inode_new();
605 if (IS_ERR(dev
->anon_inode
)) {
606 ret
= PTR_ERR(dev
->anon_inode
);
607 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret
);
611 if (drm_core_check_feature(dev
, DRIVER_MODESET
)) {
612 ret
= drm_minor_alloc(dev
, DRM_MINOR_CONTROL
);
616 WARN_ON(driver
->suspend
|| driver
->resume
);
619 if (drm_core_check_feature(dev
, DRIVER_RENDER
)) {
620 ret
= drm_minor_alloc(dev
, DRM_MINOR_RENDER
);
625 ret
= drm_minor_alloc(dev
, DRM_MINOR_LEGACY
);
629 if (drm_ht_create(&dev
->map_hash
, 12))
632 drm_legacy_ctxbitmap_init(dev
);
634 if (drm_core_check_feature(dev
, DRIVER_GEM
)) {
635 ret
= drm_gem_init(dev
);
637 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
643 ret
= drm_dev_set_unique(dev
, dev_name(parent
));
651 if (drm_core_check_feature(dev
, DRIVER_GEM
))
652 drm_gem_destroy(dev
);
654 drm_legacy_ctxbitmap_cleanup(dev
);
655 drm_ht_remove(&dev
->map_hash
);
657 drm_minor_free(dev
, DRM_MINOR_LEGACY
);
658 drm_minor_free(dev
, DRM_MINOR_RENDER
);
659 drm_minor_free(dev
, DRM_MINOR_CONTROL
);
660 drm_fs_inode_free(dev
->anon_inode
);
662 mutex_destroy(&dev
->master_mutex
);
666 EXPORT_SYMBOL(drm_dev_alloc
);
668 static void drm_dev_release(struct kref
*ref
)
670 struct drm_device
*dev
= container_of(ref
, struct drm_device
, ref
);
672 if (drm_core_check_feature(dev
, DRIVER_GEM
))
673 drm_gem_destroy(dev
);
675 drm_legacy_ctxbitmap_cleanup(dev
);
676 drm_ht_remove(&dev
->map_hash
);
677 drm_fs_inode_free(dev
->anon_inode
);
679 drm_minor_free(dev
, DRM_MINOR_LEGACY
);
680 drm_minor_free(dev
, DRM_MINOR_RENDER
);
681 drm_minor_free(dev
, DRM_MINOR_CONTROL
);
683 mutex_destroy(&dev
->master_mutex
);
689 * drm_dev_ref - Take reference of a DRM device
690 * @dev: device to take reference of or NULL
692 * This increases the ref-count of @dev by one. You *must* already own a
693 * reference when calling this. Use drm_dev_unref() to drop this reference
696 * This function never fails. However, this function does not provide *any*
697 * guarantee whether the device is alive or running. It only provides a
698 * reference to the object and the memory associated with it.
700 void drm_dev_ref(struct drm_device
*dev
)
705 EXPORT_SYMBOL(drm_dev_ref
);
708 * drm_dev_unref - Drop reference of a DRM device
709 * @dev: device to drop reference of or NULL
711 * This decreases the ref-count of @dev by one. The device is destroyed if the
712 * ref-count drops to zero.
714 void drm_dev_unref(struct drm_device
*dev
)
717 kref_put(&dev
->ref
, drm_dev_release
);
719 EXPORT_SYMBOL(drm_dev_unref
);
722 * drm_dev_register - Register DRM device
723 * @dev: Device to register
724 * @flags: Flags passed to the driver's .load() function
726 * Register the DRM device @dev with the system, advertise device to user-space
727 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
728 * previously. Right after drm_dev_register() the driver should call
729 * drm_connector_register_all() to register all connectors in sysfs. This is
730 * a separate call for backward compatibility with drivers still using
731 * the deprecated ->load() callback, where connectors are registered from within
732 * the ->load() callback.
734 * Never call this twice on any device!
736 * NOTE: To ensure backward compatibility with existing drivers method this
737 * function calls the ->load() method after registering the device nodes,
738 * creating race conditions. Usage of the ->load() methods is therefore
739 * deprecated, drivers must perform all initialization before calling
740 * drm_dev_register().
743 * 0 on success, negative error code on failure.
745 int drm_dev_register(struct drm_device
*dev
, unsigned long flags
)
749 mutex_lock(&drm_global_mutex
);
751 ret
= drm_minor_register(dev
, DRM_MINOR_CONTROL
);
755 ret
= drm_minor_register(dev
, DRM_MINOR_RENDER
);
759 ret
= drm_minor_register(dev
, DRM_MINOR_LEGACY
);
763 if (dev
->driver
->load
) {
764 ret
= dev
->driver
->load(dev
, flags
);
773 drm_minor_unregister(dev
, DRM_MINOR_LEGACY
);
774 drm_minor_unregister(dev
, DRM_MINOR_RENDER
);
775 drm_minor_unregister(dev
, DRM_MINOR_CONTROL
);
777 mutex_unlock(&drm_global_mutex
);
780 EXPORT_SYMBOL(drm_dev_register
);
783 * drm_dev_unregister - Unregister DRM device
784 * @dev: Device to unregister
786 * Unregister the DRM device from the system. This does the reverse of
787 * drm_dev_register() but does not deallocate the device. The caller must call
788 * drm_dev_unref() to drop their final reference.
790 * This should be called first in the device teardown code to make sure
791 * userspace can't access the device instance any more.
793 void drm_dev_unregister(struct drm_device
*dev
)
795 struct drm_map_list
*r_list
, *list_temp
;
799 if (dev
->driver
->unload
)
800 dev
->driver
->unload(dev
);
803 drm_pci_agp_destroy(dev
);
805 drm_vblank_cleanup(dev
);
807 list_for_each_entry_safe(r_list
, list_temp
, &dev
->maplist
, head
)
808 drm_legacy_rmmap(dev
, r_list
->map
);
810 drm_minor_unregister(dev
, DRM_MINOR_LEGACY
);
811 drm_minor_unregister(dev
, DRM_MINOR_RENDER
);
812 drm_minor_unregister(dev
, DRM_MINOR_CONTROL
);
814 EXPORT_SYMBOL(drm_dev_unregister
);
817 * drm_dev_set_unique - Set the unique name of a DRM device
818 * @dev: device of which to set the unique name
821 * Sets the unique name of a DRM device using the specified string. Drivers
822 * can use this at driver probe time if the unique name of the devices they
825 * Return: 0 on success or a negative error code on failure.
827 int drm_dev_set_unique(struct drm_device
*dev
, const char *name
)
830 dev
->unique
= kstrdup(name
, GFP_KERNEL
);
832 return dev
->unique
? 0 : -ENOMEM
;
834 EXPORT_SYMBOL(drm_dev_set_unique
);
838 * The DRM core module initializes all global DRM objects and makes them
839 * available to drivers. Once setup, drivers can probe their respective
841 * Currently, core management includes:
842 * - The "DRM-Global" key/value database
843 * - Global ID management for connectors
844 * - DRM major number allocation
845 * - DRM minor management
849 * Furthermore, the DRM core provides dynamic char-dev lookups. For each
850 * interface registered on a DRM device, you can request minor numbers from DRM
851 * core. DRM core takes care of major-number management and char-dev
852 * registration. A stub ->open() callback forwards any open() requests to the
856 static int drm_stub_open(struct inode
*inode
, struct file
*filp
)
858 const struct file_operations
*new_fops
;
859 struct drm_minor
*minor
;
864 mutex_lock(&drm_global_mutex
);
865 minor
= drm_minor_acquire(iminor(inode
));
867 err
= PTR_ERR(minor
);
871 new_fops
= fops_get(minor
->dev
->driver
->fops
);
877 replace_fops(filp
, new_fops
);
878 if (filp
->f_op
->open
)
879 err
= filp
->f_op
->open(inode
, filp
);
884 drm_minor_release(minor
);
886 mutex_unlock(&drm_global_mutex
);
890 static const struct file_operations drm_stub_fops
= {
891 .owner
= THIS_MODULE
,
892 .open
= drm_stub_open
,
893 .llseek
= noop_llseek
,
896 static int __init
drm_core_init(void)
901 drm_connector_ida_init();
902 idr_init(&drm_minors_idr
);
904 if (register_chrdev(DRM_MAJOR
, "drm", &drm_stub_fops
))
907 ret
= drm_sysfs_init();
909 printk(KERN_ERR
"DRM: Error creating drm class.\n");
913 drm_debugfs_root
= debugfs_create_dir("dri", NULL
);
914 if (!drm_debugfs_root
) {
915 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
920 DRM_INFO("Initialized %s %d.%d.%d %s\n",
921 CORE_NAME
, CORE_MAJOR
, CORE_MINOR
, CORE_PATCHLEVEL
, CORE_DATE
);
926 unregister_chrdev(DRM_MAJOR
, "drm");
928 idr_destroy(&drm_minors_idr
);
933 static void __exit
drm_core_exit(void)
935 debugfs_remove(drm_debugfs_root
);
938 unregister_chrdev(DRM_MAJOR
, "drm");
940 drm_connector_ida_destroy();
941 idr_destroy(&drm_minors_idr
);
944 module_init(drm_core_init
);
945 module_exit(drm_core_exit
);