| /* |
| * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org |
| * |
| * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California. |
| * All Rights Reserved. |
| * |
| * Author Rickard E. (Rik) Faith <faith@valinux.com> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| * DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <linux/debugfs.h> |
| #include <linux/fs.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/mount.h> |
| #include <linux/slab.h> |
| #include <drm/drmP.h> |
| #include <drm/drm_core.h> |
| #include "drm_legacy.h" |
| #include "drm_internal.h" |
| |
| /* |
| * drm_debug: Enable debug output. |
| * Bitmask of DRM_UT_x. See include/drm/drmP.h for details. |
| */ |
| unsigned int drm_debug = 0; |
| EXPORT_SYMBOL(drm_debug); |
| |
| MODULE_AUTHOR(CORE_AUTHOR); |
| MODULE_DESCRIPTION(CORE_DESC); |
| MODULE_LICENSE("GPL and additional rights"); |
| MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n" |
| "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n" |
| "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n" |
| "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n" |
| "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n" |
| "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n" |
| "\t\tBit 5 (0x20) will enable VBL messages (vblank code)"); |
| module_param_named(debug, drm_debug, int, 0600); |
| |
| static DEFINE_SPINLOCK(drm_minor_lock); |
| static struct idr drm_minors_idr; |
| |
| static struct dentry *drm_debugfs_root; |
| |
| void drm_err(const char *format, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| va_start(args, format); |
| |
| vaf.fmt = format; |
| vaf.va = &args; |
| |
| printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV", |
| __builtin_return_address(0), &vaf); |
| |
| va_end(args); |
| } |
| EXPORT_SYMBOL(drm_err); |
| |
| void drm_ut_debug_printk(const char *function_name, const char *format, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| va_start(args, format); |
| vaf.fmt = format; |
| vaf.va = &args; |
| |
| printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf); |
| |
| va_end(args); |
| } |
| EXPORT_SYMBOL(drm_ut_debug_printk); |
| |
| struct drm_master *drm_master_create(struct drm_minor *minor) |
| { |
| struct drm_master *master; |
| |
| master = kzalloc(sizeof(*master), GFP_KERNEL); |
| if (!master) |
| return NULL; |
| |
| kref_init(&master->refcount); |
| spin_lock_init(&master->lock.spinlock); |
| init_waitqueue_head(&master->lock.lock_queue); |
| idr_init(&master->magic_map); |
| master->minor = minor; |
| |
| return master; |
| } |
| |
| struct drm_master *drm_master_get(struct drm_master *master) |
| { |
| kref_get(&master->refcount); |
| return master; |
| } |
| EXPORT_SYMBOL(drm_master_get); |
| |
| static void drm_master_destroy(struct kref *kref) |
| { |
| struct drm_master *master = container_of(kref, struct drm_master, refcount); |
| struct drm_device *dev = master->minor->dev; |
| |
| if (dev->driver->master_destroy) |
| dev->driver->master_destroy(dev, master); |
| |
| drm_legacy_master_rmmaps(dev, master); |
| |
| idr_destroy(&master->magic_map); |
| kfree(master->unique); |
| kfree(master); |
| } |
| |
| void drm_master_put(struct drm_master **master) |
| { |
| kref_put(&(*master)->refcount, drm_master_destroy); |
| *master = NULL; |
| } |
| EXPORT_SYMBOL(drm_master_put); |
| |
| int drm_setmaster_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| int ret = 0; |
| |
| mutex_lock(&dev->master_mutex); |
| if (file_priv->is_master) |
| goto out_unlock; |
| |
| if (file_priv->minor->master) { |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| |
| if (!file_priv->master) { |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| |
| if (!file_priv->allowed_master) { |
| ret = drm_new_set_master(dev, file_priv); |
| goto out_unlock; |
| } |
| |
| file_priv->minor->master = drm_master_get(file_priv->master); |
| file_priv->is_master = 1; |
| if (dev->driver->master_set) { |
| ret = dev->driver->master_set(dev, file_priv, false); |
| if (unlikely(ret != 0)) { |
| file_priv->is_master = 0; |
| drm_master_put(&file_priv->minor->master); |
| } |
| } |
| |
| out_unlock: |
| mutex_unlock(&dev->master_mutex); |
| return ret; |
| } |
| |
| int drm_dropmaster_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| int ret = -EINVAL; |
| |
| mutex_lock(&dev->master_mutex); |
| if (!file_priv->is_master) |
| goto out_unlock; |
| |
| if (!file_priv->minor->master) |
| goto out_unlock; |
| |
| ret = 0; |
| if (dev->driver->master_drop) |
| dev->driver->master_drop(dev, file_priv, false); |
| drm_master_put(&file_priv->minor->master); |
| file_priv->is_master = 0; |
| |
| out_unlock: |
| mutex_unlock(&dev->master_mutex); |
| return ret; |
| } |
| |
| /* |
| * DRM Minors |
| * A DRM device can provide several char-dev interfaces on the DRM-Major. Each |
| * of them is represented by a drm_minor object. Depending on the capabilities |
| * of the device-driver, different interfaces are registered. |
| * |
| * Minors can be accessed via dev->$minor_name. This pointer is either |
| * NULL or a valid drm_minor pointer and stays valid as long as the device is |
| * valid. This means, DRM minors have the same life-time as the underlying |
| * device. However, this doesn't mean that the minor is active. Minors are |
| * registered and unregistered dynamically according to device-state. |
| */ |
| |
| static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
| unsigned int type) |
| { |
| switch (type) { |
| case DRM_MINOR_LEGACY: |
| return &dev->primary; |
| case DRM_MINOR_RENDER: |
| return &dev->render; |
| case DRM_MINOR_CONTROL: |
| return &dev->control; |
| default: |
| return NULL; |
| } |
| } |
| |
| static int drm_minor_alloc(struct drm_device *dev, unsigned int type) |
| { |
| struct drm_minor *minor; |
| unsigned long flags; |
| int r; |
| |
| minor = kzalloc(sizeof(*minor), GFP_KERNEL); |
| if (!minor) |
| return -ENOMEM; |
| |
| minor->type = type; |
| minor->dev = dev; |
| |
| idr_preload(GFP_KERNEL); |
| spin_lock_irqsave(&drm_minor_lock, flags); |
| r = idr_alloc(&drm_minors_idr, |
| NULL, |
| 64 * type, |
| 64 * (type + 1), |
| GFP_NOWAIT); |
| spin_unlock_irqrestore(&drm_minor_lock, flags); |
| idr_preload_end(); |
| |
| if (r < 0) |
| goto err_free; |
| |
| minor->index = r; |
| |
| minor->kdev = drm_sysfs_minor_alloc(minor); |
| if (IS_ERR(minor->kdev)) { |
| r = PTR_ERR(minor->kdev); |
| goto err_index; |
| } |
| |
| *drm_minor_get_slot(dev, type) = minor; |
| return 0; |
| |
| err_index: |
| spin_lock_irqsave(&drm_minor_lock, flags); |
| idr_remove(&drm_minors_idr, minor->index); |
| spin_unlock_irqrestore(&drm_minor_lock, flags); |
| err_free: |
| kfree(minor); |
| return r; |
| } |
| |
| static void drm_minor_free(struct drm_device *dev, unsigned int type) |
| { |
| struct drm_minor **slot, *minor; |
| unsigned long flags; |
| |
| slot = drm_minor_get_slot(dev, type); |
| minor = *slot; |
| if (!minor) |
| return; |
| |
| put_device(minor->kdev); |
| |
| spin_lock_irqsave(&drm_minor_lock, flags); |
| idr_remove(&drm_minors_idr, minor->index); |
| spin_unlock_irqrestore(&drm_minor_lock, flags); |
| |
| kfree(minor); |
| *slot = NULL; |
| } |
| |
| static int drm_minor_register(struct drm_device *dev, unsigned int type) |
| { |
| struct drm_minor *minor; |
| unsigned long flags; |
| int ret; |
| |
| DRM_DEBUG("\n"); |
| |
| minor = *drm_minor_get_slot(dev, type); |
| if (!minor) |
| return 0; |
| |
| ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
| if (ret) { |
| DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
| return ret; |
| } |
| |
| ret = device_add(minor->kdev); |
| if (ret) |
| goto err_debugfs; |
| |
| /* replace NULL with @minor so lookups will succeed from now on */ |
| spin_lock_irqsave(&drm_minor_lock, flags); |
| idr_replace(&drm_minors_idr, minor, minor->index); |
| spin_unlock_irqrestore(&drm_minor_lock, flags); |
| |
| DRM_DEBUG("new minor registered %d\n", minor->index); |
| return 0; |
| |
| err_debugfs: |
| drm_debugfs_cleanup(minor); |
| return ret; |
| } |
| |
| static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
| { |
| struct drm_minor *minor; |
| unsigned long flags; |
| |
| minor = *drm_minor_get_slot(dev, type); |
| if (!minor || !device_is_registered(minor->kdev)) |
| return; |
| |
| /* replace @minor with NULL so lookups will fail from now on */ |
| spin_lock_irqsave(&drm_minor_lock, flags); |
| idr_replace(&drm_minors_idr, NULL, minor->index); |
| spin_unlock_irqrestore(&drm_minor_lock, flags); |
| |
| device_del(minor->kdev); |
| dev_set_drvdata(minor->kdev, NULL); /* safety belt */ |
| drm_debugfs_cleanup(minor); |
| } |
| |
| /** |
| * drm_minor_acquire - Acquire a DRM minor |
| * @minor_id: Minor ID of the DRM-minor |
| * |
| * Looks up the given minor-ID and returns the respective DRM-minor object. The |
| * refence-count of the underlying device is increased so you must release this |
| * object with drm_minor_release(). |
| * |
| * As long as you hold this minor, it is guaranteed that the object and the |
| * minor->dev pointer will stay valid! However, the device may get unplugged and |
| * unregistered while you hold the minor. |
| * |
| * Returns: |
| * Pointer to minor-object with increased device-refcount, or PTR_ERR on |
| * failure. |
| */ |
| struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
| { |
| struct drm_minor *minor; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&drm_minor_lock, flags); |
| minor = idr_find(&drm_minors_idr, minor_id); |
| if (minor) |
| drm_dev_ref(minor->dev); |
| spin_unlock_irqrestore(&drm_minor_lock, flags); |
| |
| if (!minor) { |
| return ERR_PTR(-ENODEV); |
| } else if (drm_device_is_unplugged(minor->dev)) { |
| drm_dev_unref(minor->dev); |
| return ERR_PTR(-ENODEV); |
| } |
| |
| return minor; |
| } |
| |
| /** |
| * drm_minor_release - Release DRM minor |
| * @minor: Pointer to DRM minor object |
| * |
| * Release a minor that was previously acquired via drm_minor_acquire(). |
| */ |
| void drm_minor_release(struct drm_minor *minor) |
| { |
| drm_dev_unref(minor->dev); |
| } |
| |
| /** |
| * DOC: driver instance overview |
| * |
| * A device instance for a drm driver is represented by struct &drm_device. This |
| * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() |
| * callbacks implemented by the driver. The driver then needs to initialize all |
| * the various subsystems for the drm device like memory management, vblank |
| * handling, modesetting support and intial output configuration plus obviously |
| * initialize all the corresponding hardware bits. An important part of this is |
| * also calling drm_dev_set_unique() to set the userspace-visible unique name of |
| * this device instance. Finally when everything is up and running and ready for |
| * userspace the device instance can be published using drm_dev_register(). |
| * |
| * There is also deprecated support for initalizing device instances using |
| * bus-specific helpers and the ->load() callback. But due to |
| * backwards-compatibility needs the device instance have to be published too |
| * early, which requires unpretty global locking to make safe and is therefore |
| * only support for existing drivers not yet converted to the new scheme. |
| * |
| * When cleaning up a device instance everything needs to be done in reverse: |
| * First unpublish the device instance with drm_dev_unregister(). Then clean up |
| * any other resources allocated at device initialization and drop the driver's |
| * reference to &drm_device using drm_dev_unref(). |
| * |
| * Note that the lifetime rules for &drm_device instance has still a lot of |
| * historical baggage. Hence use the reference counting provided by |
| * drm_dev_ref() and drm_dev_unref() only carefully. |
| * |
| * Also note that embedding of &drm_device is currently not (yet) supported (but |
| * it would be easy to add). Drivers can store driver-private data in the |
| * dev_priv field of &drm_device. |
| */ |
| |
| /** |
| * drm_put_dev - Unregister and release a DRM device |
| * @dev: DRM device |
| * |
| * Called at module unload time or when a PCI device is unplugged. |
| * |
| * Cleans up all DRM device, calling drm_lastclose(). |
| * |
| * Note: Use of this function is deprecated. It will eventually go away |
| * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly |
| * instead to make sure that the device isn't userspace accessible any more |
| * while teardown is in progress, ensuring that userspace can't access an |
| * inconsistent state. |
| */ |
| void drm_put_dev(struct drm_device *dev) |
| { |
| DRM_DEBUG("\n"); |
| |
| if (!dev) { |
| DRM_ERROR("cleanup called no dev\n"); |
| return; |
| } |
| |
| drm_dev_unregister(dev); |
| drm_dev_unref(dev); |
| } |
| EXPORT_SYMBOL(drm_put_dev); |
| |
| void drm_unplug_dev(struct drm_device *dev) |
| { |
| /* for a USB device */ |
| drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
| drm_minor_unregister(dev, DRM_MINOR_RENDER); |
| drm_minor_unregister(dev, DRM_MINOR_CONTROL); |
| |
| mutex_lock(&drm_global_mutex); |
| |
| drm_device_set_unplugged(dev); |
| |
| if (dev->open_count == 0) { |
| drm_put_dev(dev); |
| } |
| mutex_unlock(&drm_global_mutex); |
| } |
| EXPORT_SYMBOL(drm_unplug_dev); |
| |
| /* |
| * DRM internal mount |
| * We want to be able to allocate our own "struct address_space" to control |
| * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow |
| * stand-alone address_space objects, so we need an underlying inode. As there |
| * is no way to allocate an independent inode easily, we need a fake internal |
| * VFS mount-point. |
| * |
| * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() |
| * frees it again. You are allowed to use iget() and iput() to get references to |
| * the inode. But each drm_fs_inode_new() call must be paired with exactly one |
| * drm_fs_inode_free() call (which does not have to be the last iput()). |
| * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it |
| * between multiple inode-users. You could, technically, call |
| * iget() + drm_fs_inode_free() directly after alloc and sometime later do an |
| * iput(), but this way you'd end up with a new vfsmount for each inode. |
| */ |
| |
| static int drm_fs_cnt; |
| static struct vfsmount *drm_fs_mnt; |
| |
| static const struct dentry_operations drm_fs_dops = { |
| .d_dname = simple_dname, |
| }; |
| |
| static const struct super_operations drm_fs_sops = { |
| .statfs = simple_statfs, |
| }; |
| |
| static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *data) |
| { |
| return mount_pseudo(fs_type, |
| "drm:", |
| &drm_fs_sops, |
| &drm_fs_dops, |
| 0x010203ff); |
| } |
| |
| static struct file_system_type drm_fs_type = { |
| .name = "drm", |
| .owner = THIS_MODULE, |
| .mount = drm_fs_mount, |
| .kill_sb = kill_anon_super, |
| }; |
| |
| static struct inode *drm_fs_inode_new(void) |
| { |
| struct inode *inode; |
| int r; |
| |
| r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); |
| if (r < 0) { |
| DRM_ERROR("Cannot mount pseudo fs: %d\n", r); |
| return ERR_PTR(r); |
| } |
| |
| inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); |
| if (IS_ERR(inode)) |
| simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); |
| |
| return inode; |
| } |
| |
| static void drm_fs_inode_free(struct inode *inode) |
| { |
| if (inode) { |
| iput(inode); |
| simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); |
| } |
| } |
| |
| /** |
| * drm_dev_alloc - Allocate new DRM device |
| * @driver: DRM driver to allocate device for |
| * @parent: Parent device object |
| * |
| * Allocate and initialize a new DRM device. No device registration is done. |
| * Call drm_dev_register() to advertice the device to user space and register it |
| * with other core subsystems. This should be done last in the device |
| * initialization sequence to make sure userspace can't access an inconsistent |
| * state. |
| * |
| * The initial ref-count of the object is 1. Use drm_dev_ref() and |
| * drm_dev_unref() to take and drop further ref-counts. |
| * |
| * Note that for purely virtual devices @parent can be NULL. |
| * |
| * RETURNS: |
| * Pointer to new DRM device, or NULL if out of memory. |
| */ |
| struct drm_device *drm_dev_alloc(struct drm_driver *driver, |
| struct device *parent) |
| { |
| struct drm_device *dev; |
| int ret; |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return NULL; |
| |
| kref_init(&dev->ref); |
| dev->dev = parent; |
| dev->driver = driver; |
| |
| INIT_LIST_HEAD(&dev->filelist); |
| INIT_LIST_HEAD(&dev->ctxlist); |
| INIT_LIST_HEAD(&dev->vmalist); |
| INIT_LIST_HEAD(&dev->maplist); |
| INIT_LIST_HEAD(&dev->vblank_event_list); |
| |
| spin_lock_init(&dev->buf_lock); |
| spin_lock_init(&dev->event_lock); |
| mutex_init(&dev->struct_mutex); |
| mutex_init(&dev->filelist_mutex); |
| mutex_init(&dev->ctxlist_mutex); |
| mutex_init(&dev->master_mutex); |
| |
| dev->anon_inode = drm_fs_inode_new(); |
| if (IS_ERR(dev->anon_inode)) { |
| ret = PTR_ERR(dev->anon_inode); |
| DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); |
| goto err_free; |
| } |
| |
| if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
| ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); |
| if (ret) |
| goto err_minors; |
| |
| WARN_ON(driver->suspend || driver->resume); |
| } |
| |
| if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
| ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
| if (ret) |
| goto err_minors; |
| } |
| |
| ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY); |
| if (ret) |
| goto err_minors; |
| |
| if (drm_ht_create(&dev->map_hash, 12)) |
| goto err_minors; |
| |
| drm_legacy_ctxbitmap_init(dev); |
| |
| if (drm_core_check_feature(dev, DRIVER_GEM)) { |
| ret = drm_gem_init(dev); |
| if (ret) { |
| DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); |
| goto err_ctxbitmap; |
| } |
| } |
| |
| if (parent) { |
| ret = drm_dev_set_unique(dev, dev_name(parent)); |
| if (ret) |
| goto err_setunique; |
| } |
| |
| return dev; |
| |
| err_setunique: |
| if (drm_core_check_feature(dev, DRIVER_GEM)) |
| drm_gem_destroy(dev); |
| err_ctxbitmap: |
| drm_legacy_ctxbitmap_cleanup(dev); |
| drm_ht_remove(&dev->map_hash); |
| err_minors: |
| drm_minor_free(dev, DRM_MINOR_LEGACY); |
| drm_minor_free(dev, DRM_MINOR_RENDER); |
| drm_minor_free(dev, DRM_MINOR_CONTROL); |
| drm_fs_inode_free(dev->anon_inode); |
| err_free: |
| mutex_destroy(&dev->master_mutex); |
| kfree(dev); |
| return NULL; |
| } |
| EXPORT_SYMBOL(drm_dev_alloc); |
| |
| static void drm_dev_release(struct kref *ref) |
| { |
| struct drm_device *dev = container_of(ref, struct drm_device, ref); |
| |
| if (drm_core_check_feature(dev, DRIVER_GEM)) |
| drm_gem_destroy(dev); |
| |
| drm_legacy_ctxbitmap_cleanup(dev); |
| drm_ht_remove(&dev->map_hash); |
| drm_fs_inode_free(dev->anon_inode); |
| |
| drm_minor_free(dev, DRM_MINOR_LEGACY); |
| drm_minor_free(dev, DRM_MINOR_RENDER); |
| drm_minor_free(dev, DRM_MINOR_CONTROL); |
| |
| mutex_destroy(&dev->master_mutex); |
| kfree(dev->unique); |
| kfree(dev); |
| } |
| |
| /** |
| * drm_dev_ref - Take reference of a DRM device |
| * @dev: device to take reference of or NULL |
| * |
| * This increases the ref-count of @dev by one. You *must* already own a |
| * reference when calling this. Use drm_dev_unref() to drop this reference |
| * again. |
| * |
| * This function never fails. However, this function does not provide *any* |
| * guarantee whether the device is alive or running. It only provides a |
| * reference to the object and the memory associated with it. |
| */ |
| void drm_dev_ref(struct drm_device *dev) |
| { |
| if (dev) |
| kref_get(&dev->ref); |
| } |
| EXPORT_SYMBOL(drm_dev_ref); |
| |
| /** |
| * drm_dev_unref - Drop reference of a DRM device |
| * @dev: device to drop reference of or NULL |
| * |
| * This decreases the ref-count of @dev by one. The device is destroyed if the |
| * ref-count drops to zero. |
| */ |
| void drm_dev_unref(struct drm_device *dev) |
| { |
| if (dev) |
| kref_put(&dev->ref, drm_dev_release); |
| } |
| EXPORT_SYMBOL(drm_dev_unref); |
| |
| /** |
| * drm_dev_register - Register DRM device |
| * @dev: Device to register |
| * @flags: Flags passed to the driver's .load() function |
| * |
| * Register the DRM device @dev with the system, advertise device to user-space |
| * and start normal device operation. @dev must be allocated via drm_dev_alloc() |
| * previously. Right after drm_dev_register() the driver should call |
| * drm_connector_register_all() to register all connectors in sysfs. This is |
| * a separate call for backward compatibility with drivers still using |
| * the deprecated ->load() callback, where connectors are registered from within |
| * the ->load() callback. |
| * |
| * Never call this twice on any device! |
| * |
| * NOTE: To ensure backward compatibility with existing drivers method this |
| * function calls the ->load() method after registering the device nodes, |
| * creating race conditions. Usage of the ->load() methods is therefore |
| * deprecated, drivers must perform all initialization before calling |
| * drm_dev_register(). |
| * |
| * RETURNS: |
| * 0 on success, negative error code on failure. |
| */ |
| int drm_dev_register(struct drm_device *dev, unsigned long flags) |
| { |
| int ret; |
| |
| mutex_lock(&drm_global_mutex); |
| |
| ret = drm_minor_register(dev, DRM_MINOR_CONTROL); |
| if (ret) |
| goto err_minors; |
| |
| ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
| if (ret) |
| goto err_minors; |
| |
| ret = drm_minor_register(dev, DRM_MINOR_LEGACY); |
| if (ret) |
| goto err_minors; |
| |
| if (dev->driver->load) { |
| ret = dev->driver->load(dev, flags); |
| if (ret) |
| goto err_minors; |
| } |
| |
| ret = 0; |
| goto out_unlock; |
| |
| err_minors: |
| drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
| drm_minor_unregister(dev, DRM_MINOR_RENDER); |
| drm_minor_unregister(dev, DRM_MINOR_CONTROL); |
| out_unlock: |
| mutex_unlock(&drm_global_mutex); |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_dev_register); |
| |
| /** |
| * drm_dev_unregister - Unregister DRM device |
| * @dev: Device to unregister |
| * |
| * Unregister the DRM device from the system. This does the reverse of |
| * drm_dev_register() but does not deallocate the device. The caller must call |
| * drm_dev_unref() to drop their final reference. |
| * |
| * This should be called first in the device teardown code to make sure |
| * userspace can't access the device instance any more. |
| */ |
| void drm_dev_unregister(struct drm_device *dev) |
| { |
| struct drm_map_list *r_list, *list_temp; |
| |
| drm_lastclose(dev); |
| |
| if (dev->driver->unload) |
| dev->driver->unload(dev); |
| |
| if (dev->agp) |
| drm_pci_agp_destroy(dev); |
| |
| drm_vblank_cleanup(dev); |
| |
| list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) |
| drm_legacy_rmmap(dev, r_list->map); |
| |
| drm_minor_unregister(dev, DRM_MINOR_LEGACY); |
| drm_minor_unregister(dev, DRM_MINOR_RENDER); |
| drm_minor_unregister(dev, DRM_MINOR_CONTROL); |
| } |
| EXPORT_SYMBOL(drm_dev_unregister); |
| |
| /** |
| * drm_dev_set_unique - Set the unique name of a DRM device |
| * @dev: device of which to set the unique name |
| * @name: unique name |
| * |
| * Sets the unique name of a DRM device using the specified string. Drivers |
| * can use this at driver probe time if the unique name of the devices they |
| * drive is static. |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int drm_dev_set_unique(struct drm_device *dev, const char *name) |
| { |
| kfree(dev->unique); |
| dev->unique = kstrdup(name, GFP_KERNEL); |
| |
| return dev->unique ? 0 : -ENOMEM; |
| } |
| EXPORT_SYMBOL(drm_dev_set_unique); |
| |
| /* |
| * DRM Core |
| * The DRM core module initializes all global DRM objects and makes them |
| * available to drivers. Once setup, drivers can probe their respective |
| * devices. |
| * Currently, core management includes: |
| * - The "DRM-Global" key/value database |
| * - Global ID management for connectors |
| * - DRM major number allocation |
| * - DRM minor management |
| * - DRM sysfs class |
| * - DRM debugfs root |
| * |
| * Furthermore, the DRM core provides dynamic char-dev lookups. For each |
| * interface registered on a DRM device, you can request minor numbers from DRM |
| * core. DRM core takes care of major-number management and char-dev |
| * registration. A stub ->open() callback forwards any open() requests to the |
| * registered minor. |
| */ |
| |
| static int drm_stub_open(struct inode *inode, struct file *filp) |
| { |
| const struct file_operations *new_fops; |
| struct drm_minor *minor; |
| int err; |
| |
| DRM_DEBUG("\n"); |
| |
| mutex_lock(&drm_global_mutex); |
| minor = drm_minor_acquire(iminor(inode)); |
| if (IS_ERR(minor)) { |
| err = PTR_ERR(minor); |
| goto out_unlock; |
| } |
| |
| new_fops = fops_get(minor->dev->driver->fops); |
| if (!new_fops) { |
| err = -ENODEV; |
| goto out_release; |
| } |
| |
| replace_fops(filp, new_fops); |
| if (filp->f_op->open) |
| err = filp->f_op->open(inode, filp); |
| else |
| err = 0; |
| |
| out_release: |
| drm_minor_release(minor); |
| out_unlock: |
| mutex_unlock(&drm_global_mutex); |
| return err; |
| } |
| |
| static const struct file_operations drm_stub_fops = { |
| .owner = THIS_MODULE, |
| .open = drm_stub_open, |
| .llseek = noop_llseek, |
| }; |
| |
| static int __init drm_core_init(void) |
| { |
| int ret = -ENOMEM; |
| |
| drm_global_init(); |
| drm_connector_ida_init(); |
| idr_init(&drm_minors_idr); |
| |
| if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) |
| goto err_p1; |
| |
| ret = drm_sysfs_init(); |
| if (ret < 0) { |
| printk(KERN_ERR "DRM: Error creating drm class.\n"); |
| goto err_p2; |
| } |
| |
| drm_debugfs_root = debugfs_create_dir("dri", NULL); |
| if (!drm_debugfs_root) { |
| DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); |
| ret = -1; |
| goto err_p3; |
| } |
| |
| DRM_INFO("Initialized %s %d.%d.%d %s\n", |
| CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); |
| return 0; |
| err_p3: |
| drm_sysfs_destroy(); |
| err_p2: |
| unregister_chrdev(DRM_MAJOR, "drm"); |
| |
| idr_destroy(&drm_minors_idr); |
| err_p1: |
| return ret; |
| } |
| |
| static void __exit drm_core_exit(void) |
| { |
| debugfs_remove(drm_debugfs_root); |
| drm_sysfs_destroy(); |
| |
| unregister_chrdev(DRM_MAJOR, "drm"); |
| |
| drm_connector_ida_destroy(); |
| idr_destroy(&drm_minors_idr); |
| } |
| |
| module_init(drm_core_init); |
| module_exit(drm_core_exit); |