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_drv.h>
39 #include "drm_crtc_internal.h"
40 #include "drm_legacy.h"
41 #include "drm_internal.h"
42 #include "drm_crtc_internal.h"
45 * drm_debug: Enable debug output.
46 * Bitmask of DRM_UT_x. See include/drm/drmP.h for details.
48 unsigned int drm_debug
= 0;
49 EXPORT_SYMBOL(drm_debug
);
51 MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl");
52 MODULE_DESCRIPTION("DRM shared core routines");
53 MODULE_LICENSE("GPL and additional rights");
54 MODULE_PARM_DESC(debug
, "Enable debug output, where each bit enables a debug category.\n"
55 "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n"
56 "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n"
57 "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n"
58 "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n"
59 "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n"
60 "\t\tBit 5 (0x20) will enable VBL messages (vblank code)");
61 module_param_named(debug
, drm_debug
, int, 0600);
63 static DEFINE_SPINLOCK(drm_minor_lock
);
64 static struct idr drm_minors_idr
;
67 * If the drm core fails to init for whatever reason,
68 * we should prevent any drivers from registering with it.
69 * It's best to check this at drm_dev_init(), as some drivers
70 * prefer to embed struct drm_device into their own device
71 * structure and call drm_dev_init() themselves.
73 static bool drm_core_init_complete
= false;
75 static struct dentry
*drm_debugfs_root
;
77 #define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV"
79 void drm_dev_printk(const struct device
*dev
, const char *level
,
80 unsigned int category
, const char *function_name
,
81 const char *prefix
, const char *format
, ...)
86 if (category
!= DRM_UT_NONE
&& !(drm_debug
& category
))
89 va_start(args
, format
);
94 dev_printk(level
, dev
, DRM_PRINTK_FMT
, function_name
, prefix
,
97 printk("%s" DRM_PRINTK_FMT
, level
, function_name
, prefix
, &vaf
);
101 EXPORT_SYMBOL(drm_dev_printk
);
103 void drm_printk(const char *level
, unsigned int category
,
104 const char *format
, ...)
106 struct va_format vaf
;
109 if (category
!= DRM_UT_NONE
&& !(drm_debug
& category
))
112 va_start(args
, format
);
116 printk("%s" "[" DRM_NAME
":%ps]%s %pV",
117 level
, __builtin_return_address(0),
118 strcmp(level
, KERN_ERR
) == 0 ? " *ERROR*" : "", &vaf
);
122 EXPORT_SYMBOL(drm_printk
);
126 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
127 * of them is represented by a drm_minor object. Depending on the capabilities
128 * of the device-driver, different interfaces are registered.
130 * Minors can be accessed via dev->$minor_name. This pointer is either
131 * NULL or a valid drm_minor pointer and stays valid as long as the device is
132 * valid. This means, DRM minors have the same life-time as the underlying
133 * device. However, this doesn't mean that the minor is active. Minors are
134 * registered and unregistered dynamically according to device-state.
137 static struct drm_minor
**drm_minor_get_slot(struct drm_device
*dev
,
141 case DRM_MINOR_PRIMARY
:
142 return &dev
->primary
;
143 case DRM_MINOR_RENDER
:
145 case DRM_MINOR_CONTROL
:
146 return &dev
->control
;
152 static int drm_minor_alloc(struct drm_device
*dev
, unsigned int type
)
154 struct drm_minor
*minor
;
158 minor
= kzalloc(sizeof(*minor
), GFP_KERNEL
);
165 idr_preload(GFP_KERNEL
);
166 spin_lock_irqsave(&drm_minor_lock
, flags
);
167 r
= idr_alloc(&drm_minors_idr
,
172 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
180 minor
->kdev
= drm_sysfs_minor_alloc(minor
);
181 if (IS_ERR(minor
->kdev
)) {
182 r
= PTR_ERR(minor
->kdev
);
186 *drm_minor_get_slot(dev
, type
) = minor
;
190 spin_lock_irqsave(&drm_minor_lock
, flags
);
191 idr_remove(&drm_minors_idr
, minor
->index
);
192 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
198 static void drm_minor_free(struct drm_device
*dev
, unsigned int type
)
200 struct drm_minor
**slot
, *minor
;
203 slot
= drm_minor_get_slot(dev
, type
);
208 put_device(minor
->kdev
);
210 spin_lock_irqsave(&drm_minor_lock
, flags
);
211 idr_remove(&drm_minors_idr
, minor
->index
);
212 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
218 static int drm_minor_register(struct drm_device
*dev
, unsigned int type
)
220 struct drm_minor
*minor
;
226 minor
= *drm_minor_get_slot(dev
, type
);
230 ret
= drm_debugfs_init(minor
, minor
->index
, drm_debugfs_root
);
232 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
236 ret
= device_add(minor
->kdev
);
240 /* replace NULL with @minor so lookups will succeed from now on */
241 spin_lock_irqsave(&drm_minor_lock
, flags
);
242 idr_replace(&drm_minors_idr
, minor
, minor
->index
);
243 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
245 DRM_DEBUG("new minor registered %d\n", minor
->index
);
249 drm_debugfs_cleanup(minor
);
253 static void drm_minor_unregister(struct drm_device
*dev
, unsigned int type
)
255 struct drm_minor
*minor
;
258 minor
= *drm_minor_get_slot(dev
, type
);
259 if (!minor
|| !device_is_registered(minor
->kdev
))
262 /* replace @minor with NULL so lookups will fail from now on */
263 spin_lock_irqsave(&drm_minor_lock
, flags
);
264 idr_replace(&drm_minors_idr
, NULL
, minor
->index
);
265 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
267 device_del(minor
->kdev
);
268 dev_set_drvdata(minor
->kdev
, NULL
); /* safety belt */
269 drm_debugfs_cleanup(minor
);
273 * Looks up the given minor-ID and returns the respective DRM-minor object. The
274 * refence-count of the underlying device is increased so you must release this
275 * object with drm_minor_release().
277 * As long as you hold this minor, it is guaranteed that the object and the
278 * minor->dev pointer will stay valid! However, the device may get unplugged and
279 * unregistered while you hold the minor.
281 struct drm_minor
*drm_minor_acquire(unsigned int minor_id
)
283 struct drm_minor
*minor
;
286 spin_lock_irqsave(&drm_minor_lock
, flags
);
287 minor
= idr_find(&drm_minors_idr
, minor_id
);
289 drm_dev_ref(minor
->dev
);
290 spin_unlock_irqrestore(&drm_minor_lock
, flags
);
293 return ERR_PTR(-ENODEV
);
294 } else if (drm_dev_is_unplugged(minor
->dev
)) {
295 drm_dev_unref(minor
->dev
);
296 return ERR_PTR(-ENODEV
);
302 void drm_minor_release(struct drm_minor
*minor
)
304 drm_dev_unref(minor
->dev
);
308 * DOC: driver instance overview
310 * A device instance for a drm driver is represented by &struct drm_device. This
311 * is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
312 * callbacks implemented by the driver. The driver then needs to initialize all
313 * the various subsystems for the drm device like memory management, vblank
314 * handling, modesetting support and intial output configuration plus obviously
315 * initialize all the corresponding hardware bits. An important part of this is
316 * also calling drm_dev_set_unique() to set the userspace-visible unique name of
317 * this device instance. Finally when everything is up and running and ready for
318 * userspace the device instance can be published using drm_dev_register().
320 * There is also deprecated support for initalizing device instances using
321 * bus-specific helpers and the &drm_driver.load callback. But due to
322 * backwards-compatibility needs the device instance have to be published too
323 * early, which requires unpretty global locking to make safe and is therefore
324 * only support for existing drivers not yet converted to the new scheme.
326 * When cleaning up a device instance everything needs to be done in reverse:
327 * First unpublish the device instance with drm_dev_unregister(). Then clean up
328 * any other resources allocated at device initialization and drop the driver's
329 * reference to &drm_device using drm_dev_unref().
331 * Note that the lifetime rules for &drm_device instance has still a lot of
332 * historical baggage. Hence use the reference counting provided by
333 * drm_dev_ref() and drm_dev_unref() only carefully.
335 * It is recommended that drivers embed &struct drm_device into their own device
336 * structure, which is supported through drm_dev_init().
340 * drm_put_dev - Unregister and release a DRM device
343 * Called at module unload time or when a PCI device is unplugged.
345 * Cleans up all DRM device, calling drm_lastclose().
347 * Note: Use of this function is deprecated. It will eventually go away
348 * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
349 * instead to make sure that the device isn't userspace accessible any more
350 * while teardown is in progress, ensuring that userspace can't access an
351 * inconsistent state.
353 void drm_put_dev(struct drm_device
*dev
)
358 DRM_ERROR("cleanup called no dev\n");
362 drm_dev_unregister(dev
);
365 EXPORT_SYMBOL(drm_put_dev
);
367 static void drm_device_set_unplugged(struct drm_device
*dev
)
370 atomic_set(&dev
->unplugged
, 1);
374 * drm_dev_unplug - unplug a DRM device
377 * This unplugs a hotpluggable DRM device, which makes it inaccessible to
378 * userspace operations. Entry-points can use drm_dev_is_unplugged(). This
379 * essentially unregisters the device like drm_dev_unregister(), but can be
380 * called while there are still open users of @dev.
382 void drm_dev_unplug(struct drm_device
*dev
)
384 drm_dev_unregister(dev
);
386 mutex_lock(&drm_global_mutex
);
387 drm_device_set_unplugged(dev
);
388 if (dev
->open_count
== 0)
390 mutex_unlock(&drm_global_mutex
);
392 EXPORT_SYMBOL(drm_dev_unplug
);
396 * We want to be able to allocate our own "struct address_space" to control
397 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
398 * stand-alone address_space objects, so we need an underlying inode. As there
399 * is no way to allocate an independent inode easily, we need a fake internal
402 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
403 * frees it again. You are allowed to use iget() and iput() to get references to
404 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
405 * drm_fs_inode_free() call (which does not have to be the last iput()).
406 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
407 * between multiple inode-users. You could, technically, call
408 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
409 * iput(), but this way you'd end up with a new vfsmount for each inode.
412 static int drm_fs_cnt
;
413 static struct vfsmount
*drm_fs_mnt
;
415 static const struct dentry_operations drm_fs_dops
= {
416 .d_dname
= simple_dname
,
419 static const struct super_operations drm_fs_sops
= {
420 .statfs
= simple_statfs
,
423 static struct dentry
*drm_fs_mount(struct file_system_type
*fs_type
, int flags
,
424 const char *dev_name
, void *data
)
426 return mount_pseudo(fs_type
,
433 static struct file_system_type drm_fs_type
= {
435 .owner
= THIS_MODULE
,
436 .mount
= drm_fs_mount
,
437 .kill_sb
= kill_anon_super
,
440 static struct inode
*drm_fs_inode_new(void)
445 r
= simple_pin_fs(&drm_fs_type
, &drm_fs_mnt
, &drm_fs_cnt
);
447 DRM_ERROR("Cannot mount pseudo fs: %d\n", r
);
451 inode
= alloc_anon_inode(drm_fs_mnt
->mnt_sb
);
453 simple_release_fs(&drm_fs_mnt
, &drm_fs_cnt
);
458 static void drm_fs_inode_free(struct inode
*inode
)
462 simple_release_fs(&drm_fs_mnt
, &drm_fs_cnt
);
467 * drm_dev_init - Initialise new DRM device
469 * @driver: DRM driver
470 * @parent: Parent device object
472 * Initialize a new DRM device. No device registration is done.
473 * Call drm_dev_register() to advertice the device to user space and register it
474 * with other core subsystems. This should be done last in the device
475 * initialization sequence to make sure userspace can't access an inconsistent
478 * The initial ref-count of the object is 1. Use drm_dev_ref() and
479 * drm_dev_unref() to take and drop further ref-counts.
481 * Note that for purely virtual devices @parent can be NULL.
483 * Drivers that do not want to allocate their own device struct
484 * embedding &struct drm_device can call drm_dev_alloc() instead. For drivers
485 * that do embed &struct drm_device it must be placed first in the overall
486 * structure, and the overall structure must be allocated using kmalloc(): The
487 * drm core's release function unconditionally calls kfree() on the @dev pointer
488 * when the final reference is released. To override this behaviour, and so
489 * allow embedding of the drm_device inside the driver's device struct at an
490 * arbitrary offset, you must supply a &drm_driver.release callback and control
491 * the finalization explicitly.
494 * 0 on success, or error code on failure.
496 int drm_dev_init(struct drm_device
*dev
,
497 struct drm_driver
*driver
,
498 struct device
*parent
)
502 if (!drm_core_init_complete
) {
503 DRM_ERROR("DRM core is not initialized\n");
507 kref_init(&dev
->ref
);
509 dev
->driver
= driver
;
511 INIT_LIST_HEAD(&dev
->filelist
);
512 INIT_LIST_HEAD(&dev
->ctxlist
);
513 INIT_LIST_HEAD(&dev
->vmalist
);
514 INIT_LIST_HEAD(&dev
->maplist
);
515 INIT_LIST_HEAD(&dev
->vblank_event_list
);
517 spin_lock_init(&dev
->buf_lock
);
518 spin_lock_init(&dev
->event_lock
);
519 mutex_init(&dev
->struct_mutex
);
520 mutex_init(&dev
->filelist_mutex
);
521 mutex_init(&dev
->ctxlist_mutex
);
522 mutex_init(&dev
->master_mutex
);
524 dev
->anon_inode
= drm_fs_inode_new();
525 if (IS_ERR(dev
->anon_inode
)) {
526 ret
= PTR_ERR(dev
->anon_inode
);
527 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret
);
531 if (drm_core_check_feature(dev
, DRIVER_RENDER
)) {
532 ret
= drm_minor_alloc(dev
, DRM_MINOR_RENDER
);
537 ret
= drm_minor_alloc(dev
, DRM_MINOR_PRIMARY
);
541 ret
= drm_ht_create(&dev
->map_hash
, 12);
545 drm_legacy_ctxbitmap_init(dev
);
547 if (drm_core_check_feature(dev
, DRIVER_GEM
)) {
548 ret
= drm_gem_init(dev
);
550 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
555 /* Use the parent device name as DRM device unique identifier, but fall
556 * back to the driver name for virtual devices like vgem. */
557 ret
= drm_dev_set_unique(dev
, parent
? dev_name(parent
) : driver
->name
);
564 if (drm_core_check_feature(dev
, DRIVER_GEM
))
565 drm_gem_destroy(dev
);
567 drm_legacy_ctxbitmap_cleanup(dev
);
568 drm_ht_remove(&dev
->map_hash
);
570 drm_minor_free(dev
, DRM_MINOR_PRIMARY
);
571 drm_minor_free(dev
, DRM_MINOR_RENDER
);
572 drm_minor_free(dev
, DRM_MINOR_CONTROL
);
573 drm_fs_inode_free(dev
->anon_inode
);
575 mutex_destroy(&dev
->master_mutex
);
576 mutex_destroy(&dev
->ctxlist_mutex
);
577 mutex_destroy(&dev
->filelist_mutex
);
578 mutex_destroy(&dev
->struct_mutex
);
581 EXPORT_SYMBOL(drm_dev_init
);
584 * drm_dev_fini - Finalize a dead DRM device
587 * Finalize a dead DRM device. This is the converse to drm_dev_init() and
588 * frees up all data allocated by it. All driver private data should be
589 * finalized first. Note that this function does not free the @dev, that is
590 * left to the caller.
592 * The ref-count of @dev must be zero, and drm_dev_fini() should only be called
593 * from a &drm_driver.release callback.
595 void drm_dev_fini(struct drm_device
*dev
)
597 drm_vblank_cleanup(dev
);
599 if (drm_core_check_feature(dev
, DRIVER_GEM
))
600 drm_gem_destroy(dev
);
602 drm_legacy_ctxbitmap_cleanup(dev
);
603 drm_ht_remove(&dev
->map_hash
);
604 drm_fs_inode_free(dev
->anon_inode
);
606 drm_minor_free(dev
, DRM_MINOR_PRIMARY
);
607 drm_minor_free(dev
, DRM_MINOR_RENDER
);
608 drm_minor_free(dev
, DRM_MINOR_CONTROL
);
610 mutex_destroy(&dev
->master_mutex
);
611 mutex_destroy(&dev
->ctxlist_mutex
);
612 mutex_destroy(&dev
->filelist_mutex
);
613 mutex_destroy(&dev
->struct_mutex
);
616 EXPORT_SYMBOL(drm_dev_fini
);
619 * drm_dev_alloc - Allocate new DRM device
620 * @driver: DRM driver to allocate device for
621 * @parent: Parent device object
623 * Allocate and initialize a new DRM device. No device registration is done.
624 * Call drm_dev_register() to advertice the device to user space and register it
625 * with other core subsystems. This should be done last in the device
626 * initialization sequence to make sure userspace can't access an inconsistent
629 * The initial ref-count of the object is 1. Use drm_dev_ref() and
630 * drm_dev_unref() to take and drop further ref-counts.
632 * Note that for purely virtual devices @parent can be NULL.
634 * Drivers that wish to subclass or embed &struct drm_device into their
635 * own struct should look at using drm_dev_init() instead.
638 * Pointer to new DRM device, or ERR_PTR on failure.
640 struct drm_device
*drm_dev_alloc(struct drm_driver
*driver
,
641 struct device
*parent
)
643 struct drm_device
*dev
;
646 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
648 return ERR_PTR(-ENOMEM
);
650 ret
= drm_dev_init(dev
, driver
, parent
);
658 EXPORT_SYMBOL(drm_dev_alloc
);
660 static void drm_dev_release(struct kref
*ref
)
662 struct drm_device
*dev
= container_of(ref
, struct drm_device
, ref
);
664 if (dev
->driver
->release
) {
665 dev
->driver
->release(dev
);
673 * drm_dev_ref - Take reference of a DRM device
674 * @dev: device to take reference of or NULL
676 * This increases the ref-count of @dev by one. You *must* already own a
677 * reference when calling this. Use drm_dev_unref() to drop this reference
680 * This function never fails. However, this function does not provide *any*
681 * guarantee whether the device is alive or running. It only provides a
682 * reference to the object and the memory associated with it.
684 void drm_dev_ref(struct drm_device
*dev
)
689 EXPORT_SYMBOL(drm_dev_ref
);
692 * drm_dev_unref - Drop reference of a DRM device
693 * @dev: device to drop reference of or NULL
695 * This decreases the ref-count of @dev by one. The device is destroyed if the
696 * ref-count drops to zero.
698 void drm_dev_unref(struct drm_device
*dev
)
701 kref_put(&dev
->ref
, drm_dev_release
);
703 EXPORT_SYMBOL(drm_dev_unref
);
705 static int create_compat_control_link(struct drm_device
*dev
)
707 struct drm_minor
*minor
;
711 if (!drm_core_check_feature(dev
, DRIVER_MODESET
))
714 minor
= *drm_minor_get_slot(dev
, DRM_MINOR_PRIMARY
);
719 * Some existing userspace out there uses the existing of the controlD*
720 * sysfs files to figure out whether it's a modeset driver. It only does
721 * readdir, hence a symlink is sufficient (and the least confusing
722 * option). Otherwise controlD* is entirely unused.
724 * Old controlD chardev have been allocated in the range
727 name
= kasprintf(GFP_KERNEL
, "controlD%d", minor
->index
+ 64);
731 ret
= sysfs_create_link(minor
->kdev
->kobj
.parent
,
740 static void remove_compat_control_link(struct drm_device
*dev
)
742 struct drm_minor
*minor
;
745 if (!drm_core_check_feature(dev
, DRIVER_MODESET
))
748 minor
= *drm_minor_get_slot(dev
, DRM_MINOR_PRIMARY
);
752 name
= kasprintf(GFP_KERNEL
, "controlD%d", minor
->index
);
756 sysfs_remove_link(minor
->kdev
->kobj
.parent
, name
);
762 * drm_dev_register - Register DRM device
763 * @dev: Device to register
764 * @flags: Flags passed to the driver's .load() function
766 * Register the DRM device @dev with the system, advertise device to user-space
767 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
770 * Never call this twice on any device!
772 * NOTE: To ensure backward compatibility with existing drivers method this
773 * function calls the &drm_driver.load method after registering the device
774 * nodes, creating race conditions. Usage of the &drm_driver.load methods is
775 * therefore deprecated, drivers must perform all initialization before calling
776 * drm_dev_register().
779 * 0 on success, negative error code on failure.
781 int drm_dev_register(struct drm_device
*dev
, unsigned long flags
)
783 struct drm_driver
*driver
= dev
->driver
;
786 mutex_lock(&drm_global_mutex
);
788 ret
= drm_minor_register(dev
, DRM_MINOR_CONTROL
);
792 ret
= drm_minor_register(dev
, DRM_MINOR_RENDER
);
796 ret
= drm_minor_register(dev
, DRM_MINOR_PRIMARY
);
800 ret
= create_compat_control_link(dev
);
804 dev
->registered
= true;
806 if (dev
->driver
->load
) {
807 ret
= dev
->driver
->load(dev
, flags
);
812 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
813 drm_modeset_register_all(dev
);
817 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
818 driver
->name
, driver
->major
, driver
->minor
,
819 driver
->patchlevel
, driver
->date
,
820 dev
->dev
? dev_name(dev
->dev
) : "virtual device",
821 dev
->primary
->index
);
826 remove_compat_control_link(dev
);
827 drm_minor_unregister(dev
, DRM_MINOR_PRIMARY
);
828 drm_minor_unregister(dev
, DRM_MINOR_RENDER
);
829 drm_minor_unregister(dev
, DRM_MINOR_CONTROL
);
831 mutex_unlock(&drm_global_mutex
);
834 EXPORT_SYMBOL(drm_dev_register
);
837 * drm_dev_unregister - Unregister DRM device
838 * @dev: Device to unregister
840 * Unregister the DRM device from the system. This does the reverse of
841 * drm_dev_register() but does not deallocate the device. The caller must call
842 * drm_dev_unref() to drop their final reference.
844 * A special form of unregistering for hotpluggable devices is drm_dev_unplug(),
845 * which can be called while there are still open users of @dev.
847 * This should be called first in the device teardown code to make sure
848 * userspace can't access the device instance any more.
850 void drm_dev_unregister(struct drm_device
*dev
)
852 struct drm_map_list
*r_list
, *list_temp
;
854 if (drm_core_check_feature(dev
, DRIVER_LEGACY
))
857 dev
->registered
= false;
859 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
860 drm_modeset_unregister_all(dev
);
862 if (dev
->driver
->unload
)
863 dev
->driver
->unload(dev
);
866 drm_pci_agp_destroy(dev
);
868 list_for_each_entry_safe(r_list
, list_temp
, &dev
->maplist
, head
)
869 drm_legacy_rmmap(dev
, r_list
->map
);
871 remove_compat_control_link(dev
);
872 drm_minor_unregister(dev
, DRM_MINOR_PRIMARY
);
873 drm_minor_unregister(dev
, DRM_MINOR_RENDER
);
874 drm_minor_unregister(dev
, DRM_MINOR_CONTROL
);
876 EXPORT_SYMBOL(drm_dev_unregister
);
879 * drm_dev_set_unique - Set the unique name of a DRM device
880 * @dev: device of which to set the unique name
883 * Sets the unique name of a DRM device using the specified string. Drivers
884 * can use this at driver probe time if the unique name of the devices they
887 * Return: 0 on success or a negative error code on failure.
889 int drm_dev_set_unique(struct drm_device
*dev
, const char *name
)
892 dev
->unique
= kstrdup(name
, GFP_KERNEL
);
894 return dev
->unique
? 0 : -ENOMEM
;
896 EXPORT_SYMBOL(drm_dev_set_unique
);
900 * The DRM core module initializes all global DRM objects and makes them
901 * available to drivers. Once setup, drivers can probe their respective
903 * Currently, core management includes:
904 * - The "DRM-Global" key/value database
905 * - Global ID management for connectors
906 * - DRM major number allocation
907 * - DRM minor management
911 * Furthermore, the DRM core provides dynamic char-dev lookups. For each
912 * interface registered on a DRM device, you can request minor numbers from DRM
913 * core. DRM core takes care of major-number management and char-dev
914 * registration. A stub ->open() callback forwards any open() requests to the
918 static int drm_stub_open(struct inode
*inode
, struct file
*filp
)
920 const struct file_operations
*new_fops
;
921 struct drm_minor
*minor
;
926 mutex_lock(&drm_global_mutex
);
927 minor
= drm_minor_acquire(iminor(inode
));
929 err
= PTR_ERR(minor
);
933 new_fops
= fops_get(minor
->dev
->driver
->fops
);
939 replace_fops(filp
, new_fops
);
940 if (filp
->f_op
->open
)
941 err
= filp
->f_op
->open(inode
, filp
);
946 drm_minor_release(minor
);
948 mutex_unlock(&drm_global_mutex
);
952 static const struct file_operations drm_stub_fops
= {
953 .owner
= THIS_MODULE
,
954 .open
= drm_stub_open
,
955 .llseek
= noop_llseek
,
958 static void drm_core_exit(void)
960 unregister_chrdev(DRM_MAJOR
, "drm");
961 debugfs_remove(drm_debugfs_root
);
963 idr_destroy(&drm_minors_idr
);
964 drm_connector_ida_destroy();
965 drm_global_release();
968 static int __init
drm_core_init(void)
973 drm_connector_ida_init();
974 idr_init(&drm_minors_idr
);
976 ret
= drm_sysfs_init();
978 DRM_ERROR("Cannot create DRM class: %d\n", ret
);
982 drm_debugfs_root
= debugfs_create_dir("dri", NULL
);
983 if (!drm_debugfs_root
) {
985 DRM_ERROR("Cannot create debugfs-root: %d\n", ret
);
989 ret
= register_chrdev(DRM_MAJOR
, "drm", &drm_stub_fops
);
993 drm_core_init_complete
= true;
995 DRM_DEBUG("Initialized\n");
1003 module_init(drm_core_init
);
1004 module_exit(drm_core_exit
);