| /* |
| * 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/pseudo_fs.h> |
| #include <linux/slab.h> |
| #include <linux/srcu.h> |
| |
| #include <drm/drm_accel.h> |
| #include <drm/drm_cache.h> |
| #include <drm/drm_client.h> |
| #include <drm/drm_color_mgmt.h> |
| #include <drm/drm_drv.h> |
| #include <drm/drm_file.h> |
| #include <drm/drm_managed.h> |
| #include <drm/drm_mode_object.h> |
| #include <drm/drm_print.h> |
| #include <drm/drm_privacy_screen_machine.h> |
| |
| #include "drm_crtc_internal.h" |
| #include "drm_internal.h" |
| #include "drm_legacy.h" |
| |
| MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); |
| MODULE_DESCRIPTION("DRM shared core routines"); |
| MODULE_LICENSE("GPL and additional rights"); |
| |
| static DEFINE_SPINLOCK(drm_minor_lock); |
| static struct idr drm_minors_idr; |
| |
| /* |
| * If the drm core fails to init for whatever reason, |
| * we should prevent any drivers from registering with it. |
| * It's best to check this at drm_dev_init(), as some drivers |
| * prefer to embed struct drm_device into their own device |
| * structure and call drm_dev_init() themselves. |
| */ |
| static bool drm_core_init_complete; |
| |
| static struct dentry *drm_debugfs_root; |
| |
| DEFINE_STATIC_SRCU(drm_unplug_srcu); |
| |
| /* |
| * 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_PRIMARY: |
| return &dev->primary; |
| case DRM_MINOR_RENDER: |
| return &dev->render; |
| case DRM_MINOR_ACCEL: |
| return &dev->accel; |
| default: |
| BUG(); |
| } |
| } |
| |
| static void drm_minor_alloc_release(struct drm_device *dev, void *data) |
| { |
| struct drm_minor *minor = data; |
| unsigned long flags; |
| |
| WARN_ON(dev != minor->dev); |
| |
| put_device(minor->kdev); |
| |
| if (minor->type == DRM_MINOR_ACCEL) { |
| accel_minor_remove(minor->index); |
| } else { |
| spin_lock_irqsave(&drm_minor_lock, flags); |
| idr_remove(&drm_minors_idr, minor->index); |
| spin_unlock_irqrestore(&drm_minor_lock, flags); |
| } |
| } |
| |
| static int drm_minor_alloc(struct drm_device *dev, unsigned int type) |
| { |
| struct drm_minor *minor; |
| unsigned long flags; |
| int r; |
| |
| minor = drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL); |
| if (!minor) |
| return -ENOMEM; |
| |
| minor->type = type; |
| minor->dev = dev; |
| |
| idr_preload(GFP_KERNEL); |
| if (type == DRM_MINOR_ACCEL) { |
| r = accel_minor_alloc(); |
| } else { |
| 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) |
| return r; |
| |
| minor->index = r; |
| |
| r = drmm_add_action_or_reset(dev, drm_minor_alloc_release, minor); |
| if (r) |
| return r; |
| |
| minor->kdev = drm_sysfs_minor_alloc(minor); |
| if (IS_ERR(minor->kdev)) |
| return PTR_ERR(minor->kdev); |
| |
| *drm_minor_get_slot(dev, type) = minor; |
| return 0; |
| } |
| |
| 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; |
| |
| if (minor->type == DRM_MINOR_ACCEL) { |
| accel_debugfs_init(minor, minor->index); |
| } else { |
| ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
| if (ret) { |
| DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
| goto err_debugfs; |
| } |
| } |
| |
| ret = device_add(minor->kdev); |
| if (ret) |
| goto err_debugfs; |
| |
| /* replace NULL with @minor so lookups will succeed from now on */ |
| if (minor->type == DRM_MINOR_ACCEL) { |
| accel_minor_replace(minor, minor->index); |
| } else { |
| 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 */ |
| if (minor->type == DRM_MINOR_ACCEL) { |
| accel_minor_replace(NULL, minor->index); |
| } else { |
| 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); |
| } |
| |
| /* |
| * 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. |
| */ |
| 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_get(minor->dev); |
| spin_unlock_irqrestore(&drm_minor_lock, flags); |
| |
| if (!minor) { |
| return ERR_PTR(-ENODEV); |
| } else if (drm_dev_is_unplugged(minor->dev)) { |
| drm_dev_put(minor->dev); |
| return ERR_PTR(-ENODEV); |
| } |
| |
| return minor; |
| } |
| |
| void drm_minor_release(struct drm_minor *minor) |
| { |
| drm_dev_put(minor->dev); |
| } |
| |
| /** |
| * DOC: driver instance overview |
| * |
| * A device instance for a drm driver is represented by &struct drm_device. This |
| * is allocated and initialized with devm_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 initial output |
| * configuration plus obviously initialize all the corresponding hardware bits. |
| * 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 initializing device instances using |
| * bus-specific helpers and the &drm_driver.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_put(). |
| * |
| * Note that any allocation or resource which is visible to userspace must be |
| * released only when the final drm_dev_put() is called, and not when the |
| * driver is unbound from the underlying physical struct &device. Best to use |
| * &drm_device managed resources with drmm_add_action(), drmm_kmalloc() and |
| * related functions. |
| * |
| * devres managed resources like devm_kmalloc() can only be used for resources |
| * directly related to the underlying hardware device, and only used in code |
| * paths fully protected by drm_dev_enter() and drm_dev_exit(). |
| * |
| * Display driver example |
| * ~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * The following example shows a typical structure of a DRM display driver. |
| * The example focus on the probe() function and the other functions that is |
| * almost always present and serves as a demonstration of devm_drm_dev_alloc(). |
| * |
| * .. code-block:: c |
| * |
| * struct driver_device { |
| * struct drm_device drm; |
| * void *userspace_facing; |
| * struct clk *pclk; |
| * }; |
| * |
| * static const struct drm_driver driver_drm_driver = { |
| * [...] |
| * }; |
| * |
| * static int driver_probe(struct platform_device *pdev) |
| * { |
| * struct driver_device *priv; |
| * struct drm_device *drm; |
| * int ret; |
| * |
| * priv = devm_drm_dev_alloc(&pdev->dev, &driver_drm_driver, |
| * struct driver_device, drm); |
| * if (IS_ERR(priv)) |
| * return PTR_ERR(priv); |
| * drm = &priv->drm; |
| * |
| * ret = drmm_mode_config_init(drm); |
| * if (ret) |
| * return ret; |
| * |
| * priv->userspace_facing = drmm_kzalloc(..., GFP_KERNEL); |
| * if (!priv->userspace_facing) |
| * return -ENOMEM; |
| * |
| * priv->pclk = devm_clk_get(dev, "PCLK"); |
| * if (IS_ERR(priv->pclk)) |
| * return PTR_ERR(priv->pclk); |
| * |
| * // Further setup, display pipeline etc |
| * |
| * platform_set_drvdata(pdev, drm); |
| * |
| * drm_mode_config_reset(drm); |
| * |
| * ret = drm_dev_register(drm); |
| * if (ret) |
| * return ret; |
| * |
| * drm_fbdev_generic_setup(drm, 32); |
| * |
| * return 0; |
| * } |
| * |
| * // This function is called before the devm_ resources are released |
| * static int driver_remove(struct platform_device *pdev) |
| * { |
| * struct drm_device *drm = platform_get_drvdata(pdev); |
| * |
| * drm_dev_unregister(drm); |
| * drm_atomic_helper_shutdown(drm) |
| * |
| * return 0; |
| * } |
| * |
| * // This function is called on kernel restart and shutdown |
| * static void driver_shutdown(struct platform_device *pdev) |
| * { |
| * drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); |
| * } |
| * |
| * static int __maybe_unused driver_pm_suspend(struct device *dev) |
| * { |
| * return drm_mode_config_helper_suspend(dev_get_drvdata(dev)); |
| * } |
| * |
| * static int __maybe_unused driver_pm_resume(struct device *dev) |
| * { |
| * drm_mode_config_helper_resume(dev_get_drvdata(dev)); |
| * |
| * return 0; |
| * } |
| * |
| * static const struct dev_pm_ops driver_pm_ops = { |
| * SET_SYSTEM_SLEEP_PM_OPS(driver_pm_suspend, driver_pm_resume) |
| * }; |
| * |
| * static struct platform_driver driver_driver = { |
| * .driver = { |
| * [...] |
| * .pm = &driver_pm_ops, |
| * }, |
| * .probe = driver_probe, |
| * .remove = driver_remove, |
| * .shutdown = driver_shutdown, |
| * }; |
| * module_platform_driver(driver_driver); |
| * |
| * Drivers that want to support device unplugging (USB, DT overlay unload) should |
| * use drm_dev_unplug() instead of drm_dev_unregister(). The driver must protect |
| * regions that is accessing device resources to prevent use after they're |
| * released. This is done using drm_dev_enter() and drm_dev_exit(). There is one |
| * shortcoming however, drm_dev_unplug() marks the drm_device as unplugged before |
| * drm_atomic_helper_shutdown() is called. This means that if the disable code |
| * paths are protected, they will not run on regular driver module unload, |
| * possibly leaving the hardware enabled. |
| */ |
| |
| /** |
| * 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_put() 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_put(dev); |
| } |
| EXPORT_SYMBOL(drm_put_dev); |
| |
| /** |
| * drm_dev_enter - Enter device critical section |
| * @dev: DRM device |
| * @idx: Pointer to index that will be passed to the matching drm_dev_exit() |
| * |
| * This function marks and protects the beginning of a section that should not |
| * be entered after the device has been unplugged. The section end is marked |
| * with drm_dev_exit(). Calls to this function can be nested. |
| * |
| * Returns: |
| * True if it is OK to enter the section, false otherwise. |
| */ |
| bool drm_dev_enter(struct drm_device *dev, int *idx) |
| { |
| *idx = srcu_read_lock(&drm_unplug_srcu); |
| |
| if (dev->unplugged) { |
| srcu_read_unlock(&drm_unplug_srcu, *idx); |
| return false; |
| } |
| |
| return true; |
| } |
| EXPORT_SYMBOL(drm_dev_enter); |
| |
| /** |
| * drm_dev_exit - Exit device critical section |
| * @idx: index returned from drm_dev_enter() |
| * |
| * This function marks the end of a section that should not be entered after |
| * the device has been unplugged. |
| */ |
| void drm_dev_exit(int idx) |
| { |
| srcu_read_unlock(&drm_unplug_srcu, idx); |
| } |
| EXPORT_SYMBOL(drm_dev_exit); |
| |
| /** |
| * drm_dev_unplug - unplug a DRM device |
| * @dev: DRM device |
| * |
| * This unplugs a hotpluggable DRM device, which makes it inaccessible to |
| * userspace operations. Entry-points can use drm_dev_enter() and |
| * drm_dev_exit() to protect device resources in a race free manner. This |
| * essentially unregisters the device like drm_dev_unregister(), but can be |
| * called while there are still open users of @dev. |
| */ |
| void drm_dev_unplug(struct drm_device *dev) |
| { |
| /* |
| * After synchronizing any critical read section is guaranteed to see |
| * the new value of ->unplugged, and any critical section which might |
| * still have seen the old value of ->unplugged is guaranteed to have |
| * finished. |
| */ |
| dev->unplugged = true; |
| synchronize_srcu(&drm_unplug_srcu); |
| |
| drm_dev_unregister(dev); |
| |
| /* Clear all CPU mappings pointing to this device */ |
| unmap_mapping_range(dev->anon_inode->i_mapping, 0, 0, 1); |
| } |
| EXPORT_SYMBOL(drm_dev_unplug); |
| |
| /* |
| * 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 int drm_fs_init_fs_context(struct fs_context *fc) |
| { |
| return init_pseudo(fc, 0x010203ff) ? 0 : -ENOMEM; |
| } |
| |
| static struct file_system_type drm_fs_type = { |
| .name = "drm", |
| .owner = THIS_MODULE, |
| .init_fs_context = drm_fs_init_fs_context, |
| .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); |
| } |
| } |
| |
| /** |
| * DOC: component helper usage recommendations |
| * |
| * DRM drivers that drive hardware where a logical device consists of a pile of |
| * independent hardware blocks are recommended to use the :ref:`component helper |
| * library<component>`. For consistency and better options for code reuse the |
| * following guidelines apply: |
| * |
| * - The entire device initialization procedure should be run from the |
| * &component_master_ops.master_bind callback, starting with |
| * devm_drm_dev_alloc(), then binding all components with |
| * component_bind_all() and finishing with drm_dev_register(). |
| * |
| * - The opaque pointer passed to all components through component_bind_all() |
| * should point at &struct drm_device of the device instance, not some driver |
| * specific private structure. |
| * |
| * - The component helper fills the niche where further standardization of |
| * interfaces is not practical. When there already is, or will be, a |
| * standardized interface like &drm_bridge or &drm_panel, providing its own |
| * functions to find such components at driver load time, like |
| * drm_of_find_panel_or_bridge(), then the component helper should not be |
| * used. |
| */ |
| |
| static void drm_dev_init_release(struct drm_device *dev, void *res) |
| { |
| drm_legacy_ctxbitmap_cleanup(dev); |
| drm_legacy_remove_map_hash(dev); |
| drm_fs_inode_free(dev->anon_inode); |
| |
| put_device(dev->dev); |
| /* Prevent use-after-free in drm_managed_release when debugging is |
| * enabled. Slightly awkward, but can't really be helped. */ |
| dev->dev = NULL; |
| mutex_destroy(&dev->master_mutex); |
| mutex_destroy(&dev->clientlist_mutex); |
| mutex_destroy(&dev->filelist_mutex); |
| mutex_destroy(&dev->struct_mutex); |
| mutex_destroy(&dev->debugfs_mutex); |
| drm_legacy_destroy_members(dev); |
| } |
| |
| static int drm_dev_init(struct drm_device *dev, |
| const struct drm_driver *driver, |
| struct device *parent) |
| { |
| struct inode *inode; |
| int ret; |
| |
| if (!drm_core_init_complete) { |
| DRM_ERROR("DRM core is not initialized\n"); |
| return -ENODEV; |
| } |
| |
| if (WARN_ON(!parent)) |
| return -EINVAL; |
| |
| kref_init(&dev->ref); |
| dev->dev = get_device(parent); |
| dev->driver = driver; |
| |
| INIT_LIST_HEAD(&dev->managed.resources); |
| spin_lock_init(&dev->managed.lock); |
| |
| /* no per-device feature limits by default */ |
| dev->driver_features = ~0u; |
| |
| if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL) && |
| (drm_core_check_feature(dev, DRIVER_RENDER) || |
| drm_core_check_feature(dev, DRIVER_MODESET))) { |
| DRM_ERROR("DRM driver can't be both a compute acceleration and graphics driver\n"); |
| return -EINVAL; |
| } |
| |
| drm_legacy_init_members(dev); |
| INIT_LIST_HEAD(&dev->filelist); |
| INIT_LIST_HEAD(&dev->filelist_internal); |
| INIT_LIST_HEAD(&dev->clientlist); |
| INIT_LIST_HEAD(&dev->vblank_event_list); |
| INIT_LIST_HEAD(&dev->debugfs_list); |
| |
| spin_lock_init(&dev->event_lock); |
| mutex_init(&dev->struct_mutex); |
| mutex_init(&dev->filelist_mutex); |
| mutex_init(&dev->clientlist_mutex); |
| mutex_init(&dev->master_mutex); |
| mutex_init(&dev->debugfs_mutex); |
| |
| ret = drmm_add_action_or_reset(dev, drm_dev_init_release, NULL); |
| if (ret) |
| return ret; |
| |
| inode = drm_fs_inode_new(); |
| if (IS_ERR(inode)) { |
| ret = PTR_ERR(inode); |
| DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); |
| goto err; |
| } |
| |
| dev->anon_inode = inode; |
| |
| if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) { |
| ret = drm_minor_alloc(dev, DRM_MINOR_ACCEL); |
| if (ret) |
| goto err; |
| } else { |
| if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
| ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
| if (ret) |
| goto err; |
| } |
| |
| ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
| if (ret) |
| goto err; |
| } |
| |
| ret = drm_legacy_create_map_hash(dev); |
| if (ret) |
| goto err; |
| |
| 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; |
| } |
| } |
| |
| dev->unique = drmm_kstrdup(dev, dev_name(parent), GFP_KERNEL); |
| if (!dev->unique) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| return 0; |
| |
| err: |
| drm_managed_release(dev); |
| |
| return ret; |
| } |
| |
| static void devm_drm_dev_init_release(void *data) |
| { |
| drm_dev_put(data); |
| } |
| |
| static int devm_drm_dev_init(struct device *parent, |
| struct drm_device *dev, |
| const struct drm_driver *driver) |
| { |
| int ret; |
| |
| ret = drm_dev_init(dev, driver, parent); |
| if (ret) |
| return ret; |
| |
| return devm_add_action_or_reset(parent, |
| devm_drm_dev_init_release, dev); |
| } |
| |
| void *__devm_drm_dev_alloc(struct device *parent, |
| const struct drm_driver *driver, |
| size_t size, size_t offset) |
| { |
| void *container; |
| struct drm_device *drm; |
| int ret; |
| |
| container = kzalloc(size, GFP_KERNEL); |
| if (!container) |
| return ERR_PTR(-ENOMEM); |
| |
| drm = container + offset; |
| ret = devm_drm_dev_init(parent, drm, driver); |
| if (ret) { |
| kfree(container); |
| return ERR_PTR(ret); |
| } |
| drmm_add_final_kfree(drm, container); |
| |
| return container; |
| } |
| EXPORT_SYMBOL(__devm_drm_dev_alloc); |
| |
| /** |
| * drm_dev_alloc - Allocate new DRM device |
| * @driver: DRM driver to allocate device for |
| * @parent: Parent device object |
| * |
| * This is the deprecated version of devm_drm_dev_alloc(), which does not support |
| * subclassing through embedding the struct &drm_device in a driver private |
| * structure, and which does not support automatic cleanup through devres. |
| * |
| * RETURNS: |
| * Pointer to new DRM device, or ERR_PTR on failure. |
| */ |
| struct drm_device *drm_dev_alloc(const struct drm_driver *driver, |
| struct device *parent) |
| { |
| struct drm_device *dev; |
| int ret; |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return ERR_PTR(-ENOMEM); |
| |
| ret = drm_dev_init(dev, driver, parent); |
| if (ret) { |
| kfree(dev); |
| return ERR_PTR(ret); |
| } |
| |
| drmm_add_final_kfree(dev, dev); |
| |
| return dev; |
| } |
| 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 (dev->driver->release) |
| dev->driver->release(dev); |
| |
| drm_managed_release(dev); |
| |
| kfree(dev->managed.final_kfree); |
| } |
| |
| /** |
| * drm_dev_get - 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_put() 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_get(struct drm_device *dev) |
| { |
| if (dev) |
| kref_get(&dev->ref); |
| } |
| EXPORT_SYMBOL(drm_dev_get); |
| |
| /** |
| * drm_dev_put - 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_put(struct drm_device *dev) |
| { |
| if (dev) |
| kref_put(&dev->ref, drm_dev_release); |
| } |
| EXPORT_SYMBOL(drm_dev_put); |
| |
| static int create_compat_control_link(struct drm_device *dev) |
| { |
| struct drm_minor *minor; |
| char *name; |
| int ret; |
| |
| if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| return 0; |
| |
| minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); |
| if (!minor) |
| return 0; |
| |
| /* |
| * Some existing userspace out there uses the existing of the controlD* |
| * sysfs files to figure out whether it's a modeset driver. It only does |
| * readdir, hence a symlink is sufficient (and the least confusing |
| * option). Otherwise controlD* is entirely unused. |
| * |
| * Old controlD chardev have been allocated in the range |
| * 64-127. |
| */ |
| name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); |
| if (!name) |
| return -ENOMEM; |
| |
| ret = sysfs_create_link(minor->kdev->kobj.parent, |
| &minor->kdev->kobj, |
| name); |
| |
| kfree(name); |
| |
| return ret; |
| } |
| |
| static void remove_compat_control_link(struct drm_device *dev) |
| { |
| struct drm_minor *minor; |
| char *name; |
| |
| if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| return; |
| |
| minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); |
| if (!minor) |
| return; |
| |
| name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); |
| if (!name) |
| return; |
| |
| sysfs_remove_link(minor->kdev->kobj.parent, name); |
| |
| kfree(name); |
| } |
| |
| /** |
| * 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 initialized via drm_dev_init() |
| * previously. |
| * |
| * Never call this twice on any device! |
| * |
| * NOTE: To ensure backward compatibility with existing drivers method this |
| * function calls the &drm_driver.load method after registering the device |
| * nodes, creating race conditions. Usage of the &drm_driver.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) |
| { |
| const struct drm_driver *driver = dev->driver; |
| int ret; |
| |
| if (!driver->load) |
| drm_mode_config_validate(dev); |
| |
| WARN_ON(!dev->managed.final_kfree); |
| |
| if (drm_dev_needs_global_mutex(dev)) |
| mutex_lock(&drm_global_mutex); |
| |
| ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
| if (ret) |
| goto err_minors; |
| |
| ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
| if (ret) |
| goto err_minors; |
| |
| ret = drm_minor_register(dev, DRM_MINOR_ACCEL); |
| if (ret) |
| goto err_minors; |
| |
| ret = create_compat_control_link(dev); |
| if (ret) |
| goto err_minors; |
| |
| dev->registered = true; |
| |
| if (driver->load) { |
| ret = driver->load(dev, flags); |
| if (ret) |
| goto err_minors; |
| } |
| |
| if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| drm_modeset_register_all(dev); |
| |
| DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", |
| driver->name, driver->major, driver->minor, |
| driver->patchlevel, driver->date, |
| dev->dev ? dev_name(dev->dev) : "virtual device", |
| dev->primary ? dev->primary->index : dev->accel->index); |
| |
| goto out_unlock; |
| |
| err_minors: |
| remove_compat_control_link(dev); |
| drm_minor_unregister(dev, DRM_MINOR_ACCEL); |
| drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
| drm_minor_unregister(dev, DRM_MINOR_RENDER); |
| out_unlock: |
| if (drm_dev_needs_global_mutex(dev)) |
| 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_put() to drop their final reference. |
| * |
| * A special form of unregistering for hotpluggable devices is drm_dev_unplug(), |
| * which can be called while there are still open users of @dev. |
| * |
| * 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) |
| { |
| if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
| drm_lastclose(dev); |
| |
| dev->registered = false; |
| |
| drm_client_dev_unregister(dev); |
| |
| if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| drm_modeset_unregister_all(dev); |
| |
| if (dev->driver->unload) |
| dev->driver->unload(dev); |
| |
| drm_legacy_pci_agp_destroy(dev); |
| drm_legacy_rmmaps(dev); |
| |
| remove_compat_control_link(dev); |
| drm_minor_unregister(dev, DRM_MINOR_ACCEL); |
| drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
| drm_minor_unregister(dev, DRM_MINOR_RENDER); |
| } |
| EXPORT_SYMBOL(drm_dev_unregister); |
| |
| /* |
| * 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"); |
| |
| minor = drm_minor_acquire(iminor(inode)); |
| if (IS_ERR(minor)) |
| return PTR_ERR(minor); |
| |
| new_fops = fops_get(minor->dev->driver->fops); |
| if (!new_fops) { |
| err = -ENODEV; |
| goto out; |
| } |
| |
| replace_fops(filp, new_fops); |
| if (filp->f_op->open) |
| err = filp->f_op->open(inode, filp); |
| else |
| err = 0; |
| |
| out: |
| drm_minor_release(minor); |
| |
| return err; |
| } |
| |
| static const struct file_operations drm_stub_fops = { |
| .owner = THIS_MODULE, |
| .open = drm_stub_open, |
| .llseek = noop_llseek, |
| }; |
| |
| static void drm_core_exit(void) |
| { |
| drm_privacy_screen_lookup_exit(); |
| accel_core_exit(); |
| unregister_chrdev(DRM_MAJOR, "drm"); |
| debugfs_remove(drm_debugfs_root); |
| drm_sysfs_destroy(); |
| idr_destroy(&drm_minors_idr); |
| drm_connector_ida_destroy(); |
| } |
| |
| static int __init drm_core_init(void) |
| { |
| int ret; |
| |
| drm_connector_ida_init(); |
| idr_init(&drm_minors_idr); |
| drm_memcpy_init_early(); |
| |
| ret = drm_sysfs_init(); |
| if (ret < 0) { |
| DRM_ERROR("Cannot create DRM class: %d\n", ret); |
| goto error; |
| } |
| |
| drm_debugfs_root = debugfs_create_dir("dri", NULL); |
| |
| ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
| if (ret < 0) |
| goto error; |
| |
| ret = accel_core_init(); |
| if (ret < 0) |
| goto error; |
| |
| drm_privacy_screen_lookup_init(); |
| |
| drm_core_init_complete = true; |
| |
| DRM_DEBUG("Initialized\n"); |
| return 0; |
| |
| error: |
| drm_core_exit(); |
| return ret; |
| } |
| |
| module_init(drm_core_init); |
| module_exit(drm_core_exit); |