/* * 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.
*/
/* * 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 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;
/** * @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;
/** * @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;
/** * @supports_virtualized_cursor_plane: * * This client is capable of handling the cursor plane with the * restrictions imposed on it by the virtualized drivers. * * This implies that the cursor plane has to behave like a cursor * i.e. track cursor movement. It also requires setting of the * hotspot properties by the client on the cursor plane.
*/ bool supports_virtualized_cursor_plane;
/** * @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;
/** * @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. * * Note that allocated entries might be NULL as a transient state when * creating or deleting a handle.
*/ struct idr object_idr;
/** @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;
/** * @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;
/** * @debugfs_client: * * debugfs directory for each client under a drm node.
*/ struct dentry *debugfs_client;
};
/** * 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>`.
*/ staticinlinebool drm_is_primary_client(conststruct 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>`.
*/ staticinlinebool drm_is_render_client(conststruct 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>`.
*/ staticinlinebool drm_is_accel_client(conststruct drm_file *file_priv)
{ return file_priv->minor->type == DRM_MINOR_ACCEL;
}
/** * 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;
};
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