121d70354SDave Airlie /* 221d70354SDave Airlie * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org 321d70354SDave Airlie * 421d70354SDave Airlie * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California. 521d70354SDave Airlie * All Rights Reserved. 621d70354SDave Airlie * 721d70354SDave Airlie * Author Rickard E. (Rik) Faith <faith@valinux.com> 821d70354SDave Airlie * 921d70354SDave Airlie * Permission is hereby granted, free of charge, to any person obtaining a 1021d70354SDave Airlie * copy of this software and associated documentation files (the "Software"), 1121d70354SDave Airlie * to deal in the Software without restriction, including without limitation 1221d70354SDave Airlie * the rights to use, copy, modify, merge, publish, distribute, sublicense, 1321d70354SDave Airlie * and/or sell copies of the Software, and to permit persons to whom the 1421d70354SDave Airlie * Software is furnished to do so, subject to the following conditions: 1521d70354SDave Airlie * 1621d70354SDave Airlie * The above copyright notice and this permission notice (including the next 1721d70354SDave Airlie * paragraph) shall be included in all copies or substantial portions of the 1821d70354SDave Airlie * Software. 1921d70354SDave Airlie * 2021d70354SDave Airlie * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 2121d70354SDave Airlie * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 2221d70354SDave Airlie * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 2321d70354SDave Airlie * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 2421d70354SDave Airlie * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 2521d70354SDave Airlie * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 2621d70354SDave Airlie * DEALINGS IN THE SOFTWARE. 2721d70354SDave Airlie */ 2821d70354SDave Airlie 2921d70354SDave Airlie #include <linux/debugfs.h> 3021d70354SDave Airlie #include <linux/fs.h> 3121d70354SDave Airlie #include <linux/module.h> 3221d70354SDave Airlie #include <linux/moduleparam.h> 3321d70354SDave Airlie #include <linux/mount.h> 3421d70354SDave Airlie #include <linux/slab.h> 3521d70354SDave Airlie #include <drm/drmP.h> 3679190ea2SBenjamin Gaignard #include "drm_crtc_internal.h" 3721d70354SDave Airlie #include "drm_legacy.h" 3867d0ec4eSDaniel Vetter #include "drm_internal.h" 3981065548SDaniel Vetter #include "drm_crtc_internal.h" 4021d70354SDave Airlie 416dc3e22eSEzequiel Garcia /* 426dc3e22eSEzequiel Garcia * drm_debug: Enable debug output. 436dc3e22eSEzequiel Garcia * Bitmask of DRM_UT_x. See include/drm/drmP.h for details. 446dc3e22eSEzequiel Garcia */ 456dc3e22eSEzequiel Garcia unsigned int drm_debug = 0; 4621d70354SDave Airlie EXPORT_SYMBOL(drm_debug); 4721d70354SDave Airlie 4882d5e73fSDavid Herrmann MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); 4982d5e73fSDavid Herrmann MODULE_DESCRIPTION("DRM shared core routines"); 5021d70354SDave Airlie MODULE_LICENSE("GPL and additional rights"); 516dc3e22eSEzequiel Garcia MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n" 526dc3e22eSEzequiel Garcia "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n" 536dc3e22eSEzequiel Garcia "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n" 546dc3e22eSEzequiel Garcia "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n" 556dc3e22eSEzequiel Garcia "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n" 566dc3e22eSEzequiel Garcia "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n" 576dc3e22eSEzequiel Garcia "\t\tBit 5 (0x20) will enable VBL messages (vblank code)"); 5821d70354SDave Airlie module_param_named(debug, drm_debug, int, 0600); 5921d70354SDave Airlie 6021d70354SDave Airlie static DEFINE_SPINLOCK(drm_minor_lock); 6121d70354SDave Airlie static struct idr drm_minors_idr; 6221d70354SDave Airlie 6321d70354SDave Airlie static struct dentry *drm_debugfs_root; 6421d70354SDave Airlie 65c4e68a58SSean Paul #define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV" 66c4e68a58SSean Paul 67c4e68a58SSean Paul void drm_dev_printk(const struct device *dev, const char *level, 68c4e68a58SSean Paul unsigned int category, const char *function_name, 69c4e68a58SSean Paul const char *prefix, const char *format, ...) 7021d70354SDave Airlie { 7121d70354SDave Airlie struct va_format vaf; 7221d70354SDave Airlie va_list args; 7321d70354SDave Airlie 74c4e68a58SSean Paul if (category != DRM_UT_NONE && !(drm_debug & category)) 75c4e68a58SSean Paul return; 7621d70354SDave Airlie 7721d70354SDave Airlie va_start(args, format); 7821d70354SDave Airlie vaf.fmt = format; 7921d70354SDave Airlie vaf.va = &args; 8021d70354SDave Airlie 81b4ba97e7SChris Wilson if (dev) 82c4e68a58SSean Paul dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix, 83c4e68a58SSean Paul &vaf); 84b4ba97e7SChris Wilson else 85b4ba97e7SChris Wilson printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf); 8621d70354SDave Airlie 8721d70354SDave Airlie va_end(args); 8821d70354SDave Airlie } 89c4e68a58SSean Paul EXPORT_SYMBOL(drm_dev_printk); 90c4e68a58SSean Paul 91c4e68a58SSean Paul void drm_printk(const char *level, unsigned int category, 92c4e68a58SSean Paul const char *format, ...) 93c4e68a58SSean Paul { 94c4e68a58SSean Paul struct va_format vaf; 95c4e68a58SSean Paul va_list args; 96c4e68a58SSean Paul 97c4e68a58SSean Paul if (category != DRM_UT_NONE && !(drm_debug & category)) 98c4e68a58SSean Paul return; 99c4e68a58SSean Paul 100c4e68a58SSean Paul va_start(args, format); 101c4e68a58SSean Paul vaf.fmt = format; 102c4e68a58SSean Paul vaf.va = &args; 103c4e68a58SSean Paul 1046bd488dbSJoe Perches printk("%s" "[" DRM_NAME ":%ps]%s %pV", 1056bd488dbSJoe Perches level, __builtin_return_address(0), 1066bd488dbSJoe Perches strcmp(level, KERN_ERR) == 0 ? " *ERROR*" : "", &vaf); 107c4e68a58SSean Paul 108c4e68a58SSean Paul va_end(args); 109c4e68a58SSean Paul } 110c4e68a58SSean Paul EXPORT_SYMBOL(drm_printk); 11121d70354SDave Airlie 11221d70354SDave Airlie /* 11321d70354SDave Airlie * DRM Minors 11421d70354SDave Airlie * A DRM device can provide several char-dev interfaces on the DRM-Major. Each 11521d70354SDave Airlie * of them is represented by a drm_minor object. Depending on the capabilities 11621d70354SDave Airlie * of the device-driver, different interfaces are registered. 11721d70354SDave Airlie * 11821d70354SDave Airlie * Minors can be accessed via dev->$minor_name. This pointer is either 11921d70354SDave Airlie * NULL or a valid drm_minor pointer and stays valid as long as the device is 12021d70354SDave Airlie * valid. This means, DRM minors have the same life-time as the underlying 12121d70354SDave Airlie * device. However, this doesn't mean that the minor is active. Minors are 12221d70354SDave Airlie * registered and unregistered dynamically according to device-state. 12321d70354SDave Airlie */ 12421d70354SDave Airlie 12521d70354SDave Airlie static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, 12621d70354SDave Airlie unsigned int type) 12721d70354SDave Airlie { 12821d70354SDave Airlie switch (type) { 129a3ccc461SDavid Herrmann case DRM_MINOR_PRIMARY: 13021d70354SDave Airlie return &dev->primary; 13121d70354SDave Airlie case DRM_MINOR_RENDER: 13221d70354SDave Airlie return &dev->render; 13321d70354SDave Airlie case DRM_MINOR_CONTROL: 13421d70354SDave Airlie return &dev->control; 13521d70354SDave Airlie default: 13621d70354SDave Airlie return NULL; 13721d70354SDave Airlie } 13821d70354SDave Airlie } 13921d70354SDave Airlie 14021d70354SDave Airlie static int drm_minor_alloc(struct drm_device *dev, unsigned int type) 14121d70354SDave Airlie { 14221d70354SDave Airlie struct drm_minor *minor; 14321d70354SDave Airlie unsigned long flags; 14421d70354SDave Airlie int r; 14521d70354SDave Airlie 14621d70354SDave Airlie minor = kzalloc(sizeof(*minor), GFP_KERNEL); 14721d70354SDave Airlie if (!minor) 14821d70354SDave Airlie return -ENOMEM; 14921d70354SDave Airlie 15021d70354SDave Airlie minor->type = type; 15121d70354SDave Airlie minor->dev = dev; 15221d70354SDave Airlie 15321d70354SDave Airlie idr_preload(GFP_KERNEL); 15421d70354SDave Airlie spin_lock_irqsave(&drm_minor_lock, flags); 15521d70354SDave Airlie r = idr_alloc(&drm_minors_idr, 15621d70354SDave Airlie NULL, 15721d70354SDave Airlie 64 * type, 15821d70354SDave Airlie 64 * (type + 1), 15921d70354SDave Airlie GFP_NOWAIT); 16021d70354SDave Airlie spin_unlock_irqrestore(&drm_minor_lock, flags); 16121d70354SDave Airlie idr_preload_end(); 16221d70354SDave Airlie 16321d70354SDave Airlie if (r < 0) 16421d70354SDave Airlie goto err_free; 16521d70354SDave Airlie 16621d70354SDave Airlie minor->index = r; 16721d70354SDave Airlie 16821d70354SDave Airlie minor->kdev = drm_sysfs_minor_alloc(minor); 16921d70354SDave Airlie if (IS_ERR(minor->kdev)) { 17021d70354SDave Airlie r = PTR_ERR(minor->kdev); 17121d70354SDave Airlie goto err_index; 17221d70354SDave Airlie } 17321d70354SDave Airlie 17421d70354SDave Airlie *drm_minor_get_slot(dev, type) = minor; 17521d70354SDave Airlie return 0; 17621d70354SDave Airlie 17721d70354SDave Airlie err_index: 17821d70354SDave Airlie spin_lock_irqsave(&drm_minor_lock, flags); 17921d70354SDave Airlie idr_remove(&drm_minors_idr, minor->index); 18021d70354SDave Airlie spin_unlock_irqrestore(&drm_minor_lock, flags); 18121d70354SDave Airlie err_free: 18221d70354SDave Airlie kfree(minor); 18321d70354SDave Airlie return r; 18421d70354SDave Airlie } 18521d70354SDave Airlie 18621d70354SDave Airlie static void drm_minor_free(struct drm_device *dev, unsigned int type) 18721d70354SDave Airlie { 18821d70354SDave Airlie struct drm_minor **slot, *minor; 18921d70354SDave Airlie unsigned long flags; 19021d70354SDave Airlie 19121d70354SDave Airlie slot = drm_minor_get_slot(dev, type); 19221d70354SDave Airlie minor = *slot; 19321d70354SDave Airlie if (!minor) 19421d70354SDave Airlie return; 19521d70354SDave Airlie 19621d70354SDave Airlie put_device(minor->kdev); 19721d70354SDave Airlie 19821d70354SDave Airlie spin_lock_irqsave(&drm_minor_lock, flags); 19921d70354SDave Airlie idr_remove(&drm_minors_idr, minor->index); 20021d70354SDave Airlie spin_unlock_irqrestore(&drm_minor_lock, flags); 20121d70354SDave Airlie 20221d70354SDave Airlie kfree(minor); 20321d70354SDave Airlie *slot = NULL; 20421d70354SDave Airlie } 20521d70354SDave Airlie 20621d70354SDave Airlie static int drm_minor_register(struct drm_device *dev, unsigned int type) 20721d70354SDave Airlie { 20821d70354SDave Airlie struct drm_minor *minor; 20921d70354SDave Airlie unsigned long flags; 21021d70354SDave Airlie int ret; 21121d70354SDave Airlie 21221d70354SDave Airlie DRM_DEBUG("\n"); 21321d70354SDave Airlie 21421d70354SDave Airlie minor = *drm_minor_get_slot(dev, type); 21521d70354SDave Airlie if (!minor) 21621d70354SDave Airlie return 0; 21721d70354SDave Airlie 21821d70354SDave Airlie ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); 21921d70354SDave Airlie if (ret) { 22021d70354SDave Airlie DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); 22121d70354SDave Airlie return ret; 22221d70354SDave Airlie } 22321d70354SDave Airlie 22421d70354SDave Airlie ret = device_add(minor->kdev); 22521d70354SDave Airlie if (ret) 22621d70354SDave Airlie goto err_debugfs; 22721d70354SDave Airlie 22821d70354SDave Airlie /* replace NULL with @minor so lookups will succeed from now on */ 22921d70354SDave Airlie spin_lock_irqsave(&drm_minor_lock, flags); 23021d70354SDave Airlie idr_replace(&drm_minors_idr, minor, minor->index); 23121d70354SDave Airlie spin_unlock_irqrestore(&drm_minor_lock, flags); 23221d70354SDave Airlie 23321d70354SDave Airlie DRM_DEBUG("new minor registered %d\n", minor->index); 23421d70354SDave Airlie return 0; 23521d70354SDave Airlie 23621d70354SDave Airlie err_debugfs: 23721d70354SDave Airlie drm_debugfs_cleanup(minor); 23821d70354SDave Airlie return ret; 23921d70354SDave Airlie } 24021d70354SDave Airlie 24121d70354SDave Airlie static void drm_minor_unregister(struct drm_device *dev, unsigned int type) 24221d70354SDave Airlie { 24321d70354SDave Airlie struct drm_minor *minor; 24421d70354SDave Airlie unsigned long flags; 24521d70354SDave Airlie 24621d70354SDave Airlie minor = *drm_minor_get_slot(dev, type); 24721d70354SDave Airlie if (!minor || !device_is_registered(minor->kdev)) 24821d70354SDave Airlie return; 24921d70354SDave Airlie 25021d70354SDave Airlie /* replace @minor with NULL so lookups will fail from now on */ 25121d70354SDave Airlie spin_lock_irqsave(&drm_minor_lock, flags); 25221d70354SDave Airlie idr_replace(&drm_minors_idr, NULL, minor->index); 25321d70354SDave Airlie spin_unlock_irqrestore(&drm_minor_lock, flags); 25421d70354SDave Airlie 25521d70354SDave Airlie device_del(minor->kdev); 25621d70354SDave Airlie dev_set_drvdata(minor->kdev, NULL); /* safety belt */ 25721d70354SDave Airlie drm_debugfs_cleanup(minor); 25821d70354SDave Airlie } 25921d70354SDave Airlie 26021d70354SDave Airlie /** 26121d70354SDave Airlie * drm_minor_acquire - Acquire a DRM minor 26221d70354SDave Airlie * @minor_id: Minor ID of the DRM-minor 26321d70354SDave Airlie * 26421d70354SDave Airlie * Looks up the given minor-ID and returns the respective DRM-minor object. The 26521d70354SDave Airlie * refence-count of the underlying device is increased so you must release this 26621d70354SDave Airlie * object with drm_minor_release(). 26721d70354SDave Airlie * 26821d70354SDave Airlie * As long as you hold this minor, it is guaranteed that the object and the 26921d70354SDave Airlie * minor->dev pointer will stay valid! However, the device may get unplugged and 27021d70354SDave Airlie * unregistered while you hold the minor. 27121d70354SDave Airlie * 27221d70354SDave Airlie * Returns: 27321d70354SDave Airlie * Pointer to minor-object with increased device-refcount, or PTR_ERR on 27421d70354SDave Airlie * failure. 27521d70354SDave Airlie */ 27621d70354SDave Airlie struct drm_minor *drm_minor_acquire(unsigned int minor_id) 27721d70354SDave Airlie { 27821d70354SDave Airlie struct drm_minor *minor; 27921d70354SDave Airlie unsigned long flags; 28021d70354SDave Airlie 28121d70354SDave Airlie spin_lock_irqsave(&drm_minor_lock, flags); 28221d70354SDave Airlie minor = idr_find(&drm_minors_idr, minor_id); 28321d70354SDave Airlie if (minor) 28421d70354SDave Airlie drm_dev_ref(minor->dev); 28521d70354SDave Airlie spin_unlock_irqrestore(&drm_minor_lock, flags); 28621d70354SDave Airlie 28721d70354SDave Airlie if (!minor) { 28821d70354SDave Airlie return ERR_PTR(-ENODEV); 28921d70354SDave Airlie } else if (drm_device_is_unplugged(minor->dev)) { 29021d70354SDave Airlie drm_dev_unref(minor->dev); 29121d70354SDave Airlie return ERR_PTR(-ENODEV); 29221d70354SDave Airlie } 29321d70354SDave Airlie 29421d70354SDave Airlie return minor; 29521d70354SDave Airlie } 29621d70354SDave Airlie 29721d70354SDave Airlie /** 29821d70354SDave Airlie * drm_minor_release - Release DRM minor 29921d70354SDave Airlie * @minor: Pointer to DRM minor object 30021d70354SDave Airlie * 30121d70354SDave Airlie * Release a minor that was previously acquired via drm_minor_acquire(). 30221d70354SDave Airlie */ 30321d70354SDave Airlie void drm_minor_release(struct drm_minor *minor) 30421d70354SDave Airlie { 30521d70354SDave Airlie drm_dev_unref(minor->dev); 30621d70354SDave Airlie } 30721d70354SDave Airlie 30821d70354SDave Airlie /** 3096e3f797cSDaniel Vetter * DOC: driver instance overview 3106e3f797cSDaniel Vetter * 3116e3f797cSDaniel Vetter * A device instance for a drm driver is represented by struct &drm_device. This 3126e3f797cSDaniel Vetter * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() 3136e3f797cSDaniel Vetter * callbacks implemented by the driver. The driver then needs to initialize all 3146e3f797cSDaniel Vetter * the various subsystems for the drm device like memory management, vblank 3156e3f797cSDaniel Vetter * handling, modesetting support and intial output configuration plus obviously 316*a6b5fac5SGerd Hoffmann * initialize all the corresponding hardware bits. An important part of this is 317*a6b5fac5SGerd Hoffmann * also calling drm_dev_set_unique() to set the userspace-visible unique name of 318*a6b5fac5SGerd Hoffmann * this device instance. Finally when everything is up and running and ready for 319*a6b5fac5SGerd Hoffmann * userspace the device instance can be published using drm_dev_register(). 3206e3f797cSDaniel Vetter * 3216e3f797cSDaniel Vetter * There is also deprecated support for initalizing device instances using 3226e3f797cSDaniel Vetter * bus-specific helpers and the ->load() callback. But due to 3236e3f797cSDaniel Vetter * backwards-compatibility needs the device instance have to be published too 3246e3f797cSDaniel Vetter * early, which requires unpretty global locking to make safe and is therefore 3256e3f797cSDaniel Vetter * only support for existing drivers not yet converted to the new scheme. 3266e3f797cSDaniel Vetter * 3276e3f797cSDaniel Vetter * When cleaning up a device instance everything needs to be done in reverse: 3286e3f797cSDaniel Vetter * First unpublish the device instance with drm_dev_unregister(). Then clean up 3296e3f797cSDaniel Vetter * any other resources allocated at device initialization and drop the driver's 3306e3f797cSDaniel Vetter * reference to &drm_device using drm_dev_unref(). 3316e3f797cSDaniel Vetter * 3326e3f797cSDaniel Vetter * Note that the lifetime rules for &drm_device instance has still a lot of 3336e3f797cSDaniel Vetter * historical baggage. Hence use the reference counting provided by 3346e3f797cSDaniel Vetter * drm_dev_ref() and drm_dev_unref() only carefully. 3356e3f797cSDaniel Vetter * 3366e3f797cSDaniel Vetter * Also note that embedding of &drm_device is currently not (yet) supported (but 3376e3f797cSDaniel Vetter * it would be easy to add). Drivers can store driver-private data in the 3386e3f797cSDaniel Vetter * dev_priv field of &drm_device. 3396e3f797cSDaniel Vetter */ 3406e3f797cSDaniel Vetter 3416e3f797cSDaniel Vetter /** 34221d70354SDave Airlie * drm_put_dev - Unregister and release a DRM device 34321d70354SDave Airlie * @dev: DRM device 34421d70354SDave Airlie * 34521d70354SDave Airlie * Called at module unload time or when a PCI device is unplugged. 34621d70354SDave Airlie * 34721d70354SDave Airlie * Cleans up all DRM device, calling drm_lastclose(). 3486e3f797cSDaniel Vetter * 3496e3f797cSDaniel Vetter * Note: Use of this function is deprecated. It will eventually go away 3506e3f797cSDaniel Vetter * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly 3516e3f797cSDaniel Vetter * instead to make sure that the device isn't userspace accessible any more 3526e3f797cSDaniel Vetter * while teardown is in progress, ensuring that userspace can't access an 3536e3f797cSDaniel Vetter * inconsistent state. 35421d70354SDave Airlie */ 35521d70354SDave Airlie void drm_put_dev(struct drm_device *dev) 35621d70354SDave Airlie { 35721d70354SDave Airlie DRM_DEBUG("\n"); 35821d70354SDave Airlie 35921d70354SDave Airlie if (!dev) { 36021d70354SDave Airlie DRM_ERROR("cleanup called no dev\n"); 36121d70354SDave Airlie return; 36221d70354SDave Airlie } 36321d70354SDave Airlie 36421d70354SDave Airlie drm_dev_unregister(dev); 36521d70354SDave Airlie drm_dev_unref(dev); 36621d70354SDave Airlie } 36721d70354SDave Airlie EXPORT_SYMBOL(drm_put_dev); 36821d70354SDave Airlie 36921d70354SDave Airlie void drm_unplug_dev(struct drm_device *dev) 37021d70354SDave Airlie { 37121d70354SDave Airlie /* for a USB device */ 372a39be606SChris Wilson drm_dev_unregister(dev); 37321d70354SDave Airlie 37421d70354SDave Airlie mutex_lock(&drm_global_mutex); 37521d70354SDave Airlie 37621d70354SDave Airlie drm_device_set_unplugged(dev); 37721d70354SDave Airlie 37821d70354SDave Airlie if (dev->open_count == 0) { 37921d70354SDave Airlie drm_put_dev(dev); 38021d70354SDave Airlie } 38121d70354SDave Airlie mutex_unlock(&drm_global_mutex); 38221d70354SDave Airlie } 38321d70354SDave Airlie EXPORT_SYMBOL(drm_unplug_dev); 38421d70354SDave Airlie 38521d70354SDave Airlie /* 38621d70354SDave Airlie * DRM internal mount 38721d70354SDave Airlie * We want to be able to allocate our own "struct address_space" to control 38821d70354SDave Airlie * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow 38921d70354SDave Airlie * stand-alone address_space objects, so we need an underlying inode. As there 39021d70354SDave Airlie * is no way to allocate an independent inode easily, we need a fake internal 39121d70354SDave Airlie * VFS mount-point. 39221d70354SDave Airlie * 39321d70354SDave Airlie * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() 39421d70354SDave Airlie * frees it again. You are allowed to use iget() and iput() to get references to 39521d70354SDave Airlie * the inode. But each drm_fs_inode_new() call must be paired with exactly one 39621d70354SDave Airlie * drm_fs_inode_free() call (which does not have to be the last iput()). 39721d70354SDave Airlie * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it 39821d70354SDave Airlie * between multiple inode-users. You could, technically, call 39921d70354SDave Airlie * iget() + drm_fs_inode_free() directly after alloc and sometime later do an 40021d70354SDave Airlie * iput(), but this way you'd end up with a new vfsmount for each inode. 40121d70354SDave Airlie */ 40221d70354SDave Airlie 40321d70354SDave Airlie static int drm_fs_cnt; 40421d70354SDave Airlie static struct vfsmount *drm_fs_mnt; 40521d70354SDave Airlie 40621d70354SDave Airlie static const struct dentry_operations drm_fs_dops = { 40721d70354SDave Airlie .d_dname = simple_dname, 40821d70354SDave Airlie }; 40921d70354SDave Airlie 41021d70354SDave Airlie static const struct super_operations drm_fs_sops = { 41121d70354SDave Airlie .statfs = simple_statfs, 41221d70354SDave Airlie }; 41321d70354SDave Airlie 41421d70354SDave Airlie static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, 41521d70354SDave Airlie const char *dev_name, void *data) 41621d70354SDave Airlie { 41721d70354SDave Airlie return mount_pseudo(fs_type, 41821d70354SDave Airlie "drm:", 41921d70354SDave Airlie &drm_fs_sops, 42021d70354SDave Airlie &drm_fs_dops, 42121d70354SDave Airlie 0x010203ff); 42221d70354SDave Airlie } 42321d70354SDave Airlie 42421d70354SDave Airlie static struct file_system_type drm_fs_type = { 42521d70354SDave Airlie .name = "drm", 42621d70354SDave Airlie .owner = THIS_MODULE, 42721d70354SDave Airlie .mount = drm_fs_mount, 42821d70354SDave Airlie .kill_sb = kill_anon_super, 42921d70354SDave Airlie }; 43021d70354SDave Airlie 43121d70354SDave Airlie static struct inode *drm_fs_inode_new(void) 43221d70354SDave Airlie { 43321d70354SDave Airlie struct inode *inode; 43421d70354SDave Airlie int r; 43521d70354SDave Airlie 43621d70354SDave Airlie r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); 43721d70354SDave Airlie if (r < 0) { 43821d70354SDave Airlie DRM_ERROR("Cannot mount pseudo fs: %d\n", r); 43921d70354SDave Airlie return ERR_PTR(r); 44021d70354SDave Airlie } 44121d70354SDave Airlie 44221d70354SDave Airlie inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); 44321d70354SDave Airlie if (IS_ERR(inode)) 44421d70354SDave Airlie simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); 44521d70354SDave Airlie 44621d70354SDave Airlie return inode; 44721d70354SDave Airlie } 44821d70354SDave Airlie 44921d70354SDave Airlie static void drm_fs_inode_free(struct inode *inode) 45021d70354SDave Airlie { 45121d70354SDave Airlie if (inode) { 45221d70354SDave Airlie iput(inode); 45321d70354SDave Airlie simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); 45421d70354SDave Airlie } 45521d70354SDave Airlie } 45621d70354SDave Airlie 45721d70354SDave Airlie /** 458b209aca3SChris Wilson * drm_dev_init - Initialise new DRM device 459b209aca3SChris Wilson * @dev: DRM device 460b209aca3SChris Wilson * @driver: DRM driver 46121d70354SDave Airlie * @parent: Parent device object 46221d70354SDave Airlie * 463b209aca3SChris Wilson * Initialize a new DRM device. No device registration is done. 46421d70354SDave Airlie * Call drm_dev_register() to advertice the device to user space and register it 4656e3f797cSDaniel Vetter * with other core subsystems. This should be done last in the device 4666e3f797cSDaniel Vetter * initialization sequence to make sure userspace can't access an inconsistent 4676e3f797cSDaniel Vetter * state. 46821d70354SDave Airlie * 46921d70354SDave Airlie * The initial ref-count of the object is 1. Use drm_dev_ref() and 47021d70354SDave Airlie * drm_dev_unref() to take and drop further ref-counts. 47121d70354SDave Airlie * 472b0ff4b93SDaniel Vetter * Note that for purely virtual devices @parent can be NULL. 473b0ff4b93SDaniel Vetter * 474b209aca3SChris Wilson * Drivers that do not want to allocate their own device struct 475b209aca3SChris Wilson * embedding struct &drm_device can call drm_dev_alloc() instead. 476b209aca3SChris Wilson * 47721d70354SDave Airlie * RETURNS: 478b209aca3SChris Wilson * 0 on success, or error code on failure. 47921d70354SDave Airlie */ 480b209aca3SChris Wilson int drm_dev_init(struct drm_device *dev, 481b209aca3SChris Wilson struct drm_driver *driver, 48221d70354SDave Airlie struct device *parent) 48321d70354SDave Airlie { 48421d70354SDave Airlie int ret; 48521d70354SDave Airlie 48621d70354SDave Airlie kref_init(&dev->ref); 48721d70354SDave Airlie dev->dev = parent; 48821d70354SDave Airlie dev->driver = driver; 48921d70354SDave Airlie 49021d70354SDave Airlie INIT_LIST_HEAD(&dev->filelist); 49121d70354SDave Airlie INIT_LIST_HEAD(&dev->ctxlist); 49221d70354SDave Airlie INIT_LIST_HEAD(&dev->vmalist); 49321d70354SDave Airlie INIT_LIST_HEAD(&dev->maplist); 49421d70354SDave Airlie INIT_LIST_HEAD(&dev->vblank_event_list); 49521d70354SDave Airlie 49621d70354SDave Airlie spin_lock_init(&dev->buf_lock); 49721d70354SDave Airlie spin_lock_init(&dev->event_lock); 49821d70354SDave Airlie mutex_init(&dev->struct_mutex); 4991d2ac403SDaniel Vetter mutex_init(&dev->filelist_mutex); 50021d70354SDave Airlie mutex_init(&dev->ctxlist_mutex); 50121d70354SDave Airlie mutex_init(&dev->master_mutex); 50221d70354SDave Airlie 50321d70354SDave Airlie dev->anon_inode = drm_fs_inode_new(); 50421d70354SDave Airlie if (IS_ERR(dev->anon_inode)) { 50521d70354SDave Airlie ret = PTR_ERR(dev->anon_inode); 50621d70354SDave Airlie DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); 50721d70354SDave Airlie goto err_free; 50821d70354SDave Airlie } 50921d70354SDave Airlie 51021d70354SDave Airlie if (drm_core_check_feature(dev, DRIVER_MODESET)) { 51121d70354SDave Airlie ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); 51221d70354SDave Airlie if (ret) 51321d70354SDave Airlie goto err_minors; 51421d70354SDave Airlie } 51521d70354SDave Airlie 51621d70354SDave Airlie if (drm_core_check_feature(dev, DRIVER_RENDER)) { 51721d70354SDave Airlie ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); 51821d70354SDave Airlie if (ret) 51921d70354SDave Airlie goto err_minors; 52021d70354SDave Airlie } 52121d70354SDave Airlie 522a3ccc461SDavid Herrmann ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); 52321d70354SDave Airlie if (ret) 52421d70354SDave Airlie goto err_minors; 52521d70354SDave Airlie 526b209aca3SChris Wilson ret = drm_ht_create(&dev->map_hash, 12); 527b209aca3SChris Wilson if (ret) 52821d70354SDave Airlie goto err_minors; 52921d70354SDave Airlie 530ba6976c1SDaniel Vetter drm_legacy_ctxbitmap_init(dev); 53121d70354SDave Airlie 5321bcecfacSAndrzej Hajda if (drm_core_check_feature(dev, DRIVER_GEM)) { 53321d70354SDave Airlie ret = drm_gem_init(dev); 53421d70354SDave Airlie if (ret) { 53521d70354SDave Airlie DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); 53621d70354SDave Airlie goto err_ctxbitmap; 53721d70354SDave Airlie } 53821d70354SDave Airlie } 53921d70354SDave Airlie 5405079c464SDaniel Vetter /* Use the parent device name as DRM device unique identifier, but fall 5415079c464SDaniel Vetter * back to the driver name for virtual devices like vgem. */ 5425079c464SDaniel Vetter ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name); 543e112e593SNicolas Iooss if (ret) 544e112e593SNicolas Iooss goto err_setunique; 545e112e593SNicolas Iooss 546b209aca3SChris Wilson return 0; 54721d70354SDave Airlie 548e112e593SNicolas Iooss err_setunique: 549e112e593SNicolas Iooss if (drm_core_check_feature(dev, DRIVER_GEM)) 550e112e593SNicolas Iooss drm_gem_destroy(dev); 55121d70354SDave Airlie err_ctxbitmap: 55221d70354SDave Airlie drm_legacy_ctxbitmap_cleanup(dev); 55321d70354SDave Airlie drm_ht_remove(&dev->map_hash); 55421d70354SDave Airlie err_minors: 555a3ccc461SDavid Herrmann drm_minor_free(dev, DRM_MINOR_PRIMARY); 55621d70354SDave Airlie drm_minor_free(dev, DRM_MINOR_RENDER); 55721d70354SDave Airlie drm_minor_free(dev, DRM_MINOR_CONTROL); 55821d70354SDave Airlie drm_fs_inode_free(dev->anon_inode); 55921d70354SDave Airlie err_free: 56021d70354SDave Airlie mutex_destroy(&dev->master_mutex); 561b209aca3SChris Wilson return ret; 562b209aca3SChris Wilson } 563b209aca3SChris Wilson EXPORT_SYMBOL(drm_dev_init); 564b209aca3SChris Wilson 565b209aca3SChris Wilson /** 566b209aca3SChris Wilson * drm_dev_alloc - Allocate new DRM device 567b209aca3SChris Wilson * @driver: DRM driver to allocate device for 568b209aca3SChris Wilson * @parent: Parent device object 569b209aca3SChris Wilson * 570b209aca3SChris Wilson * Allocate and initialize a new DRM device. No device registration is done. 571b209aca3SChris Wilson * Call drm_dev_register() to advertice the device to user space and register it 572b209aca3SChris Wilson * with other core subsystems. This should be done last in the device 573b209aca3SChris Wilson * initialization sequence to make sure userspace can't access an inconsistent 574b209aca3SChris Wilson * state. 575b209aca3SChris Wilson * 576b209aca3SChris Wilson * The initial ref-count of the object is 1. Use drm_dev_ref() and 577b209aca3SChris Wilson * drm_dev_unref() to take and drop further ref-counts. 578b209aca3SChris Wilson * 579b209aca3SChris Wilson * Note that for purely virtual devices @parent can be NULL. 580b209aca3SChris Wilson * 581b209aca3SChris Wilson * Drivers that wish to subclass or embed struct &drm_device into their 582b209aca3SChris Wilson * own struct should look at using drm_dev_init() instead. 583b209aca3SChris Wilson * 584b209aca3SChris Wilson * RETURNS: 5850f288605STom Gundersen * Pointer to new DRM device, or ERR_PTR on failure. 586b209aca3SChris Wilson */ 587b209aca3SChris Wilson struct drm_device *drm_dev_alloc(struct drm_driver *driver, 588b209aca3SChris Wilson struct device *parent) 589b209aca3SChris Wilson { 590b209aca3SChris Wilson struct drm_device *dev; 591b209aca3SChris Wilson int ret; 592b209aca3SChris Wilson 593b209aca3SChris Wilson dev = kzalloc(sizeof(*dev), GFP_KERNEL); 594b209aca3SChris Wilson if (!dev) 5950f288605STom Gundersen return ERR_PTR(-ENOMEM); 596b209aca3SChris Wilson 597b209aca3SChris Wilson ret = drm_dev_init(dev, driver, parent); 598b209aca3SChris Wilson if (ret) { 59921d70354SDave Airlie kfree(dev); 6000f288605STom Gundersen return ERR_PTR(ret); 60121d70354SDave Airlie } 602b209aca3SChris Wilson 603b209aca3SChris Wilson return dev; 604b209aca3SChris Wilson } 60521d70354SDave Airlie EXPORT_SYMBOL(drm_dev_alloc); 60621d70354SDave Airlie 60721d70354SDave Airlie static void drm_dev_release(struct kref *ref) 60821d70354SDave Airlie { 60921d70354SDave Airlie struct drm_device *dev = container_of(ref, struct drm_device, ref); 61021d70354SDave Airlie 6111bcecfacSAndrzej Hajda if (drm_core_check_feature(dev, DRIVER_GEM)) 61221d70354SDave Airlie drm_gem_destroy(dev); 61321d70354SDave Airlie 61421d70354SDave Airlie drm_legacy_ctxbitmap_cleanup(dev); 61521d70354SDave Airlie drm_ht_remove(&dev->map_hash); 61621d70354SDave Airlie drm_fs_inode_free(dev->anon_inode); 61721d70354SDave Airlie 618a3ccc461SDavid Herrmann drm_minor_free(dev, DRM_MINOR_PRIMARY); 61921d70354SDave Airlie drm_minor_free(dev, DRM_MINOR_RENDER); 62021d70354SDave Airlie drm_minor_free(dev, DRM_MINOR_CONTROL); 62121d70354SDave Airlie 62221d70354SDave Airlie mutex_destroy(&dev->master_mutex); 62321d70354SDave Airlie kfree(dev->unique); 62421d70354SDave Airlie kfree(dev); 62521d70354SDave Airlie } 62621d70354SDave Airlie 62721d70354SDave Airlie /** 62821d70354SDave Airlie * drm_dev_ref - Take reference of a DRM device 62921d70354SDave Airlie * @dev: device to take reference of or NULL 63021d70354SDave Airlie * 63121d70354SDave Airlie * This increases the ref-count of @dev by one. You *must* already own a 63221d70354SDave Airlie * reference when calling this. Use drm_dev_unref() to drop this reference 63321d70354SDave Airlie * again. 63421d70354SDave Airlie * 63521d70354SDave Airlie * This function never fails. However, this function does not provide *any* 63621d70354SDave Airlie * guarantee whether the device is alive or running. It only provides a 63721d70354SDave Airlie * reference to the object and the memory associated with it. 63821d70354SDave Airlie */ 63921d70354SDave Airlie void drm_dev_ref(struct drm_device *dev) 64021d70354SDave Airlie { 64121d70354SDave Airlie if (dev) 64221d70354SDave Airlie kref_get(&dev->ref); 64321d70354SDave Airlie } 64421d70354SDave Airlie EXPORT_SYMBOL(drm_dev_ref); 64521d70354SDave Airlie 64621d70354SDave Airlie /** 64721d70354SDave Airlie * drm_dev_unref - Drop reference of a DRM device 64821d70354SDave Airlie * @dev: device to drop reference of or NULL 64921d70354SDave Airlie * 65021d70354SDave Airlie * This decreases the ref-count of @dev by one. The device is destroyed if the 65121d70354SDave Airlie * ref-count drops to zero. 65221d70354SDave Airlie */ 65321d70354SDave Airlie void drm_dev_unref(struct drm_device *dev) 65421d70354SDave Airlie { 65521d70354SDave Airlie if (dev) 65621d70354SDave Airlie kref_put(&dev->ref, drm_dev_release); 65721d70354SDave Airlie } 65821d70354SDave Airlie EXPORT_SYMBOL(drm_dev_unref); 65921d70354SDave Airlie 66021d70354SDave Airlie /** 66121d70354SDave Airlie * drm_dev_register - Register DRM device 66221d70354SDave Airlie * @dev: Device to register 66321d70354SDave Airlie * @flags: Flags passed to the driver's .load() function 66421d70354SDave Airlie * 66521d70354SDave Airlie * Register the DRM device @dev with the system, advertise device to user-space 66621d70354SDave Airlie * and start normal device operation. @dev must be allocated via drm_dev_alloc() 667e28cd4d0SChris Wilson * previously. 66821d70354SDave Airlie * 66921d70354SDave Airlie * Never call this twice on any device! 67021d70354SDave Airlie * 6716e3f797cSDaniel Vetter * NOTE: To ensure backward compatibility with existing drivers method this 6726e3f797cSDaniel Vetter * function calls the ->load() method after registering the device nodes, 6736e3f797cSDaniel Vetter * creating race conditions. Usage of the ->load() methods is therefore 6746e3f797cSDaniel Vetter * deprecated, drivers must perform all initialization before calling 6756e3f797cSDaniel Vetter * drm_dev_register(). 6766e3f797cSDaniel Vetter * 67721d70354SDave Airlie * RETURNS: 67821d70354SDave Airlie * 0 on success, negative error code on failure. 67921d70354SDave Airlie */ 68021d70354SDave Airlie int drm_dev_register(struct drm_device *dev, unsigned long flags) 68121d70354SDave Airlie { 68221d70354SDave Airlie int ret; 68321d70354SDave Airlie 68421d70354SDave Airlie mutex_lock(&drm_global_mutex); 68521d70354SDave Airlie 68621d70354SDave Airlie ret = drm_minor_register(dev, DRM_MINOR_CONTROL); 68721d70354SDave Airlie if (ret) 68821d70354SDave Airlie goto err_minors; 68921d70354SDave Airlie 69021d70354SDave Airlie ret = drm_minor_register(dev, DRM_MINOR_RENDER); 69121d70354SDave Airlie if (ret) 69221d70354SDave Airlie goto err_minors; 69321d70354SDave Airlie 694a3ccc461SDavid Herrmann ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); 69521d70354SDave Airlie if (ret) 69621d70354SDave Airlie goto err_minors; 69721d70354SDave Airlie 69821d70354SDave Airlie if (dev->driver->load) { 69921d70354SDave Airlie ret = dev->driver->load(dev, flags); 70021d70354SDave Airlie if (ret) 70121d70354SDave Airlie goto err_minors; 70221d70354SDave Airlie } 70321d70354SDave Airlie 704bee7fb15SChris Wilson if (drm_core_check_feature(dev, DRIVER_MODESET)) 70579190ea2SBenjamin Gaignard drm_modeset_register_all(dev); 706e28cd4d0SChris Wilson 70721d70354SDave Airlie ret = 0; 70821d70354SDave Airlie goto out_unlock; 70921d70354SDave Airlie 71021d70354SDave Airlie err_minors: 711a3ccc461SDavid Herrmann drm_minor_unregister(dev, DRM_MINOR_PRIMARY); 71221d70354SDave Airlie drm_minor_unregister(dev, DRM_MINOR_RENDER); 71321d70354SDave Airlie drm_minor_unregister(dev, DRM_MINOR_CONTROL); 71421d70354SDave Airlie out_unlock: 71521d70354SDave Airlie mutex_unlock(&drm_global_mutex); 71621d70354SDave Airlie return ret; 71721d70354SDave Airlie } 71821d70354SDave Airlie EXPORT_SYMBOL(drm_dev_register); 71921d70354SDave Airlie 72021d70354SDave Airlie /** 72121d70354SDave Airlie * drm_dev_unregister - Unregister DRM device 72221d70354SDave Airlie * @dev: Device to unregister 72321d70354SDave Airlie * 72421d70354SDave Airlie * Unregister the DRM device from the system. This does the reverse of 72521d70354SDave Airlie * drm_dev_register() but does not deallocate the device. The caller must call 72621d70354SDave Airlie * drm_dev_unref() to drop their final reference. 7276e3f797cSDaniel Vetter * 7286e3f797cSDaniel Vetter * This should be called first in the device teardown code to make sure 7296e3f797cSDaniel Vetter * userspace can't access the device instance any more. 73021d70354SDave Airlie */ 73121d70354SDave Airlie void drm_dev_unregister(struct drm_device *dev) 73221d70354SDave Airlie { 73321d70354SDave Airlie struct drm_map_list *r_list, *list_temp; 73421d70354SDave Airlie 73521d70354SDave Airlie drm_lastclose(dev); 73621d70354SDave Airlie 737bee7fb15SChris Wilson if (drm_core_check_feature(dev, DRIVER_MODESET)) 73879190ea2SBenjamin Gaignard drm_modeset_unregister_all(dev); 739e28cd4d0SChris Wilson 74021d70354SDave Airlie if (dev->driver->unload) 74121d70354SDave Airlie dev->driver->unload(dev); 74221d70354SDave Airlie 74321d70354SDave Airlie if (dev->agp) 74421d70354SDave Airlie drm_pci_agp_destroy(dev); 74521d70354SDave Airlie 74621d70354SDave Airlie drm_vblank_cleanup(dev); 74721d70354SDave Airlie 74821d70354SDave Airlie list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) 7499fc5cde7SDavid Herrmann drm_legacy_rmmap(dev, r_list->map); 75021d70354SDave Airlie 751a3ccc461SDavid Herrmann drm_minor_unregister(dev, DRM_MINOR_PRIMARY); 75221d70354SDave Airlie drm_minor_unregister(dev, DRM_MINOR_RENDER); 75321d70354SDave Airlie drm_minor_unregister(dev, DRM_MINOR_CONTROL); 75421d70354SDave Airlie } 75521d70354SDave Airlie EXPORT_SYMBOL(drm_dev_unregister); 75621d70354SDave Airlie 757*a6b5fac5SGerd Hoffmann /** 758*a6b5fac5SGerd Hoffmann * drm_dev_set_unique - Set the unique name of a DRM device 759*a6b5fac5SGerd Hoffmann * @dev: device of which to set the unique name 760*a6b5fac5SGerd Hoffmann * @name: unique name 761*a6b5fac5SGerd Hoffmann * 762*a6b5fac5SGerd Hoffmann * Sets the unique name of a DRM device using the specified string. Drivers 763*a6b5fac5SGerd Hoffmann * can use this at driver probe time if the unique name of the devices they 764*a6b5fac5SGerd Hoffmann * drive is static. 765*a6b5fac5SGerd Hoffmann * 766*a6b5fac5SGerd Hoffmann * Return: 0 on success or a negative error code on failure. 767*a6b5fac5SGerd Hoffmann */ 768*a6b5fac5SGerd Hoffmann int drm_dev_set_unique(struct drm_device *dev, const char *name) 769*a6b5fac5SGerd Hoffmann { 770*a6b5fac5SGerd Hoffmann kfree(dev->unique); 771*a6b5fac5SGerd Hoffmann dev->unique = kstrdup(name, GFP_KERNEL); 772*a6b5fac5SGerd Hoffmann 773*a6b5fac5SGerd Hoffmann return dev->unique ? 0 : -ENOMEM; 774*a6b5fac5SGerd Hoffmann } 775*a6b5fac5SGerd Hoffmann EXPORT_SYMBOL(drm_dev_set_unique); 776*a6b5fac5SGerd Hoffmann 77721d70354SDave Airlie /* 77821d70354SDave Airlie * DRM Core 77921d70354SDave Airlie * The DRM core module initializes all global DRM objects and makes them 78021d70354SDave Airlie * available to drivers. Once setup, drivers can probe their respective 78121d70354SDave Airlie * devices. 78221d70354SDave Airlie * Currently, core management includes: 78321d70354SDave Airlie * - The "DRM-Global" key/value database 78421d70354SDave Airlie * - Global ID management for connectors 78521d70354SDave Airlie * - DRM major number allocation 78621d70354SDave Airlie * - DRM minor management 78721d70354SDave Airlie * - DRM sysfs class 78821d70354SDave Airlie * - DRM debugfs root 78921d70354SDave Airlie * 79021d70354SDave Airlie * Furthermore, the DRM core provides dynamic char-dev lookups. For each 79121d70354SDave Airlie * interface registered on a DRM device, you can request minor numbers from DRM 79221d70354SDave Airlie * core. DRM core takes care of major-number management and char-dev 79321d70354SDave Airlie * registration. A stub ->open() callback forwards any open() requests to the 79421d70354SDave Airlie * registered minor. 79521d70354SDave Airlie */ 79621d70354SDave Airlie 79721d70354SDave Airlie static int drm_stub_open(struct inode *inode, struct file *filp) 79821d70354SDave Airlie { 79921d70354SDave Airlie const struct file_operations *new_fops; 80021d70354SDave Airlie struct drm_minor *minor; 80121d70354SDave Airlie int err; 80221d70354SDave Airlie 80321d70354SDave Airlie DRM_DEBUG("\n"); 80421d70354SDave Airlie 80521d70354SDave Airlie mutex_lock(&drm_global_mutex); 80621d70354SDave Airlie minor = drm_minor_acquire(iminor(inode)); 80721d70354SDave Airlie if (IS_ERR(minor)) { 80821d70354SDave Airlie err = PTR_ERR(minor); 80921d70354SDave Airlie goto out_unlock; 81021d70354SDave Airlie } 81121d70354SDave Airlie 81221d70354SDave Airlie new_fops = fops_get(minor->dev->driver->fops); 81321d70354SDave Airlie if (!new_fops) { 81421d70354SDave Airlie err = -ENODEV; 81521d70354SDave Airlie goto out_release; 81621d70354SDave Airlie } 81721d70354SDave Airlie 81821d70354SDave Airlie replace_fops(filp, new_fops); 81921d70354SDave Airlie if (filp->f_op->open) 82021d70354SDave Airlie err = filp->f_op->open(inode, filp); 82121d70354SDave Airlie else 82221d70354SDave Airlie err = 0; 82321d70354SDave Airlie 82421d70354SDave Airlie out_release: 82521d70354SDave Airlie drm_minor_release(minor); 82621d70354SDave Airlie out_unlock: 82721d70354SDave Airlie mutex_unlock(&drm_global_mutex); 82821d70354SDave Airlie return err; 82921d70354SDave Airlie } 83021d70354SDave Airlie 83121d70354SDave Airlie static const struct file_operations drm_stub_fops = { 83221d70354SDave Airlie .owner = THIS_MODULE, 83321d70354SDave Airlie .open = drm_stub_open, 83421d70354SDave Airlie .llseek = noop_llseek, 83521d70354SDave Airlie }; 83621d70354SDave Airlie 8372cc107dcSDavid Herrmann static void drm_core_exit(void) 8382cc107dcSDavid Herrmann { 8392cc107dcSDavid Herrmann unregister_chrdev(DRM_MAJOR, "drm"); 8402cc107dcSDavid Herrmann debugfs_remove(drm_debugfs_root); 8412cc107dcSDavid Herrmann drm_sysfs_destroy(); 8422cc107dcSDavid Herrmann idr_destroy(&drm_minors_idr); 8432cc107dcSDavid Herrmann drm_connector_ida_destroy(); 8442cc107dcSDavid Herrmann drm_global_release(); 8452cc107dcSDavid Herrmann } 8462cc107dcSDavid Herrmann 84721d70354SDave Airlie static int __init drm_core_init(void) 84821d70354SDave Airlie { 8492cc107dcSDavid Herrmann int ret; 85021d70354SDave Airlie 85121d70354SDave Airlie drm_global_init(); 85221d70354SDave Airlie drm_connector_ida_init(); 85321d70354SDave Airlie idr_init(&drm_minors_idr); 85421d70354SDave Airlie 855fcc90213SDavid Herrmann ret = drm_sysfs_init(); 856fcc90213SDavid Herrmann if (ret < 0) { 8572cc107dcSDavid Herrmann DRM_ERROR("Cannot create DRM class: %d\n", ret); 8582cc107dcSDavid Herrmann goto error; 85921d70354SDave Airlie } 86021d70354SDave Airlie 86121d70354SDave Airlie drm_debugfs_root = debugfs_create_dir("dri", NULL); 86221d70354SDave Airlie if (!drm_debugfs_root) { 8632cc107dcSDavid Herrmann ret = -ENOMEM; 8642cc107dcSDavid Herrmann DRM_ERROR("Cannot create debugfs-root: %d\n", ret); 8652cc107dcSDavid Herrmann goto error; 86621d70354SDave Airlie } 86721d70354SDave Airlie 8682cc107dcSDavid Herrmann ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); 8692cc107dcSDavid Herrmann if (ret < 0) 8702cc107dcSDavid Herrmann goto error; 8712cc107dcSDavid Herrmann 87282d5e73fSDavid Herrmann DRM_INFO("Initialized\n"); 87321d70354SDave Airlie return 0; 87421d70354SDave Airlie 8752cc107dcSDavid Herrmann error: 8762cc107dcSDavid Herrmann drm_core_exit(); 87721d70354SDave Airlie return ret; 87821d70354SDave Airlie } 87921d70354SDave Airlie 88021d70354SDave Airlie module_init(drm_core_init); 88121d70354SDave Airlie module_exit(drm_core_exit); 882