/* * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * Copyright (c) 2009-2010, Code Aurora Forum. * All rights reserved. * * Author: Rickard E. (Rik) Faith <faith@valinux.com> * Author: Gareth Hughes <gareth@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 * VA LINUX SYSTEMS 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. */ #ifndef _DRM_FILE_H_ #define _DRM_FILE_H_ #include <linux/types.h> #include <linux/completion.h> #include <linux/idr.h> #include <uapi/drm/drm.h> #include <drm/drm_prime.h> struct dma_fence; struct drm_file; struct drm_device; struct drm_printer; struct device; struct file; /* * FIXME: Not sure we want to have drm_minor here in the end, but to avoid * header include loops we need it here for now. */ /* Note that the values of this enum are ABI (it determines * /dev/dri/renderD* numbers). * * Setting DRM_MINOR_ACCEL to 32 gives enough space for more drm minors to * be implemented before we hit any future */ enum drm_minor_type { DRM_MINOR_PRIMARY = 0, DRM_MINOR_CONTROL = 1, DRM_MINOR_RENDER = 2, DRM_MINOR_ACCEL = 32, }; /** * struct drm_minor - DRM device minor structure * * This structure represents a DRM minor number for device nodes in /dev. * Entirely opaque to drivers and should never be inspected directly by drivers. * Drivers instead should only interact with &struct drm_file and of course * &struct drm_device, which is also where driver-private data and resources can * be attached to. */ struct drm_minor { /* private: */ int index; /* Minor device number */ int type; /* Control or render or accel */ struct device *kdev; /* Linux device */ struct drm_device *dev; struct dentry *debugfs_symlink; struct dentry *debugfs_root; }; /** * struct drm_pending_event - Event queued up for userspace to read * * This represents a DRM event. Drivers can use this as a generic completion * mechanism, which supports kernel-internal &struct completion, &struct dma_fence * and also the DRM-specific &struct drm_event delivery mechanism. */ struct drm_pending_event { /** * @completion: * * Optional pointer to a kernel internal completion signalled when * drm_send_event() is called, useful to internally synchronize with * nonblocking operations. */ struct completion *completion; /** * @completion_release: * * Optional callback currently only used by the atomic modeset helpers * to clean up the reference count for the structure @completion is * stored in. */ void (*completion_release)(struct completion *completion); /** * @event: * * Pointer to the actual event that should be sent to userspace to be * read using drm_read(). Can be optional, since nowadays events are * also used to signal kernel internal threads with @completion or DMA * transactions using @fence. */ struct drm_event *event; /** * @fence: * * Optional DMA fence to unblock other hardware transactions which * depend upon the nonblocking DRM operation this event represents. */ struct dma_fence *fence; /** * @file_priv: * * &struct drm_file where @event should be delivered to. Only set when * @event is set. */ struct drm_file *file_priv; /** * @link: * * Double-linked list to keep track of this event. Can be used by the * driver up to the point when it calls drm_send_event(), after that * this list entry is owned by the core for its own book-keeping. */ struct list_head link; /** * @pending_link: * * Entry on &drm_file.pending_event_list, to keep track of all pending * events for @file_priv, to allow correct unwinding of them when * userspace closes the file before the event is delivered. */ struct list_head pending_link; }; /** * struct drm_file - DRM file private data * * This structure tracks DRM state per open file descriptor. */ struct drm_file { /** * @authenticated: * * Whether the client is allowed to submit rendering, which for legacy * nodes means it must be authenticated. * * See also the :ref:`section on primary nodes and authentication * <drm_primary_node>`. */ bool authenticated; /** * @stereo_allowed: * * True when the client has asked us to expose stereo 3D mode flags. */ bool stereo_allowed; /** * @universal_planes: * * True if client understands CRTC primary planes and cursor planes * in the plane list. Automatically set when @atomic is set. */ bool universal_planes; /** @atomic: True if client understands atomic properties. */ bool atomic; /** * @aspect_ratio_allowed: * * True, if client can handle picture aspect ratios, and has requested * to pass this information along with the mode. */ bool aspect_ratio_allowed; /** * @writeback_connectors: * * True if client understands writeback connectors */ bool writeback_connectors; /** * @was_master: * * This client has or had, master capability. Protected by struct * &drm_device.master_mutex. * * This is used to ensure that CAP_SYS_ADMIN is not enforced, if the * client is or was master in the past. */ bool was_master; /** * @is_master: * * This client is the creator of @master. Protected by struct * &drm_device.master_mutex. * * See also the :ref:`section on primary nodes and authentication * <drm_primary_node>`. */ bool is_master; /** * @master: * * Master this node is currently associated with. Protected by struct * &drm_device.master_mutex, and serialized by @master_lookup_lock. * * Only relevant if drm_is_primary_client() returns true. Note that * this only matches &drm_device.master if the master is the currently * active one. * * To update @master, both &drm_device.master_mutex and * @master_lookup_lock need to be held, therefore holding either of * them is safe and enough for the read side. * * When dereferencing this pointer, either hold struct * &drm_device.master_mutex for the duration of the pointer's use, or * use drm_file_get_master() if struct &drm_device.master_mutex is not * currently held and there is no other need to hold it. This prevents * @master from being freed during use. * * See also @authentication and @is_master and the :ref:`section on * primary nodes and authentication <drm_primary_node>`. */ struct drm_master *master; /** @master_lookup_lock: Serializes @master. */ spinlock_t master_lookup_lock; /** * @pid: Process that is using this file. * * Must only be dereferenced under a rcu_read_lock or equivalent. * * Updates are guarded with dev->filelist_mutex and reference must be * dropped after a RCU grace period to accommodate lockless readers. */ struct pid __rcu *pid; /** @client_id: A unique id for fdinfo */ u64 client_id; /** @magic: Authentication magic, see @authenticated. */ drm_magic_t magic; /** * @lhead: * * List of all open files of a DRM device, linked into * &drm_device.filelist. Protected by &drm_device.filelist_mutex. */ struct list_head lhead; /** @minor: &struct drm_minor for this file. */ struct drm_minor *minor; /** * @object_idr: * * Mapping of mm object handles to object pointers. Used by the GEM * subsystem. Protected by @table_lock. */ struct idr object_idr; /** @table_lock: Protects @object_idr. */ spinlock_t table_lock; /** @syncobj_idr: Mapping of sync object handles to object pointers. */ struct idr syncobj_idr; /** @syncobj_table_lock: Protects @syncobj_idr. */ spinlock_t syncobj_table_lock; /** @filp: Pointer to the core file structure. */ struct file *filp; /** * @driver_priv: * * Optional pointer for driver private data. Can be allocated in * &drm_driver.open and should be freed in &drm_driver.postclose. */ void *driver_priv; /** * @fbs: * * List of &struct drm_framebuffer associated with this file, using the * &drm_framebuffer.filp_head entry. * * Protected by @fbs_lock. Note that the @fbs list holds a reference on * the framebuffer object to prevent it from untimely disappearing. */ struct list_head fbs; /** @fbs_lock: Protects @fbs. */ struct mutex fbs_lock; /** * @blobs: * * User-created blob properties; this retains a reference on the * property. * * Protected by @drm_mode_config.blob_lock; */ struct list_head blobs; /** @event_wait: Waitqueue for new events added to @event_list. */ wait_queue_head_t event_wait; /** * @pending_event_list: * * List of pending &struct drm_pending_event, used to clean up pending * events in case this file gets closed before the event is signalled. * Uses the &drm_pending_event.pending_link entry. * * Protect by &drm_device.event_lock. */ struct list_head pending_event_list; /** * @event_list: * * List of &struct drm_pending_event, ready for delivery to userspace * through drm_read(). Uses the &drm_pending_event.link entry. * * Protect by &drm_device.event_lock. */ struct list_head event_list; /** * @event_space: * * Available event space to prevent userspace from * exhausting kernel memory. Currently limited to the fairly arbitrary * value of 4KB. */ int event_space; /** @event_read_lock: Serializes drm_read(). */ struct mutex event_read_lock; /** * @prime: * * Per-file buffer caches used by the PRIME buffer sharing code. */ struct drm_prime_file_private prime; /* private: */ #if IS_ENABLED(CONFIG_DRM_LEGACY) unsigned long lock_count; /* DRI1 legacy lock count */ #endif }; /** * drm_is_primary_client - is this an open file of the primary node * @file_priv: DRM file * * Returns true if this is an open file of the primary node, i.e. * &drm_file.minor of @file_priv is a primary minor. * * See also the :ref:`section on primary nodes and authentication * <drm_primary_node>`. */ static inline bool drm_is_primary_client(const struct drm_file *file_priv) { return file_priv->minor->type == DRM_MINOR_PRIMARY; } /** * drm_is_render_client - is this an open file of the render node * @file_priv: DRM file * * Returns true if this is an open file of the render node, i.e. * &drm_file.minor of @file_priv is a render minor. * * See also the :ref:`section on render nodes <drm_render_node>`. */ static inline bool drm_is_render_client(const struct drm_file *file_priv) { return file_priv->minor->type == DRM_MINOR_RENDER; } /** * drm_is_accel_client - is this an open file of the compute acceleration node * @file_priv: DRM file * * Returns true if this is an open file of the compute acceleration node, i.e. * &drm_file.minor of @file_priv is a accel minor. * * See also :doc:`Introduction to compute accelerators subsystem * </accel/introduction>`. */ static inline bool drm_is_accel_client(const struct drm_file *file_priv) { return file_priv->minor->type == DRM_MINOR_ACCEL; } void drm_file_update_pid(struct drm_file *); int drm_open(struct inode *inode, struct file *filp); int drm_open_helper(struct file *filp, struct drm_minor *minor); ssize_t drm_read(struct file *filp, char __user *buffer, size_t count, loff_t *offset); int drm_release(struct inode *inode, struct file *filp); int drm_release_noglobal(struct inode *inode, struct file *filp); __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait); int drm_event_reserve_init_locked(struct drm_device *dev, struct drm_file *file_priv, struct drm_pending_event *p, struct drm_event *e); int drm_event_reserve_init(struct drm_device *dev, struct drm_file *file_priv, struct drm_pending_event *p, struct drm_event *e); void drm_event_cancel_free(struct drm_device *dev, struct drm_pending_event *p); void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e); void drm_send_event(struct drm_device *dev, struct drm_pending_event *e); void drm_send_event_timestamp_locked(struct drm_device *dev, struct drm_pending_event *e, ktime_t timestamp); /** * struct drm_memory_stats - GEM object stats associated * @shared: Total size of GEM objects shared between processes * @private: Total size of GEM objects * @resident: Total size of GEM objects backing pages * @purgeable: Total size of GEM objects that can be purged (resident and not active) * @active: Total size of GEM objects active on one or more engines * * Used by drm_print_memory_stats() */ struct drm_memory_stats { u64 shared; u64 private; u64 resident; u64 purgeable; u64 active; }; enum drm_gem_object_status; void drm_print_memory_stats(struct drm_printer *p, const struct drm_memory_stats *stats, enum drm_gem_object_status supported_status, const char *region); void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file); void drm_show_fdinfo(struct seq_file *m, struct file *f); struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags); #endif /* _DRM_FILE_H_ */