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2ed077e467
This provides new data structures to hold "lease" information about drm mode setting objects, and provides for creating new drm_masters which have access to a subset of the available drm resources. An 'owner' is a drm_master which is not leasing the objects from another drm_master, and hence 'owns' them. A 'lessee' is a drm_master which is leasing objects from some other drm_master. Each lessee holds the set of objects which it is leasing from the lessor. A 'lessor' is a drm_master which is leasing objects to another drm_master. This is the same as the owner in the current code. The set of objects any drm_master 'controls' is limited to the set of objects it leases (for lessees) or all objects (for owners). Objects not controlled by a drm_master cannot be modified through the various state manipulating ioctls, and any state reported back to user space will be edited to make them appear idle and/or unusable. For instance, connectors always report 'disconnected', while encoders report no possible crtcs or clones. The full list of lessees leasing objects from an owner (either directly, or indirectly through another lessee), can be searched from an idr in the drm_master of the owner. Changes for v2 as suggested by Daniel Vetter <daniel.vetter@ffwll.ch>: * Sub-leasing has been disabled. * BUG_ON for lock checking replaced with lockdep_assert_held * 'change' ioctl has been removed. * Leased objects can always be controlled by the lessor; the 'mask_lease' flag has been removed * Checking for leased status has been simplified, replacing the drm_lease_check function with drm_lease_held. Changes in v3, some suggested by Dave Airlie <airlied@gmail.com> * Add revocation. This allows leases to be effectively revoked by removing all of the objects they have access to. The lease itself hangs around as it's hanging off a file. * Free the leases IDR when the master is destroyed * _drm_lease_held should look at lessees, not lessor * Allow non-master files to check for lease status Changes in v4, suggested by Dave Airlie <airlied@gmail.com> * Formatting and whitespace changes Changes in v5 (airlied) * check DRIVER_MODESET before lease destroy call * check DRIVER_MODESET for lease revoke (Chris) * Use idr_mutex uniformly for all lease elements of struct drm_master. (Keith) Signed-off-by: Keith Packard <keithp@keithp.com>
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/*
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* Internal Header for the Direct Rendering Manager
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*
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* Copyright 2016 Intel Corporation
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*
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* Author: Daniel Vetter <daniel.vetter@ffwll.ch>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _DRM_AUTH_H_
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#define _DRM_AUTH_H_
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/*
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* Legacy DRI1 locking data structure. Only here instead of in drm_legacy.h for
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* include ordering reasons.
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*
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* DO NOT USE.
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*/
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struct drm_lock_data {
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struct drm_hw_lock *hw_lock;
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struct drm_file *file_priv;
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wait_queue_head_t lock_queue;
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unsigned long lock_time;
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spinlock_t spinlock;
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uint32_t kernel_waiters;
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uint32_t user_waiters;
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int idle_has_lock;
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};
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/**
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* struct drm_master - drm master structure
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*
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* @refcount: Refcount for this master object.
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* @dev: Link back to the DRM device
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* @lock: DRI1 lock information.
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* @driver_priv: Pointer to driver-private information.
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* @lessor: Lease holder
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* @lessee_id: id for lessees. Owners always have id 0
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* @lessee_list: other lessees of the same master
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* @lessees: drm_masters leasing from this one
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* @leases: Objects leased to this drm_master.
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* @lessee_idr: All lessees under this owner (only used where lessor == NULL)
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*
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* Note that master structures are only relevant for the legacy/primary device
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* nodes, hence there can only be one per device, not one per drm_minor.
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*/
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struct drm_master {
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struct kref refcount;
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struct drm_device *dev;
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/**
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* @unique: Unique identifier: e.g. busid. Protected by
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* &drm_device.master_mutex.
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*/
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char *unique;
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/**
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* @unique_len: Length of unique field. Protected by
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* &drm_device.master_mutex.
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*/
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int unique_len;
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/**
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* @magic_map: Map of used authentication tokens. Protected by
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* &drm_device.master_mutex.
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*/
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struct idr magic_map;
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struct drm_lock_data lock;
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void *driver_priv;
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/* Tree of display resource leases, each of which is a drm_master struct
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* All of these get activated simultaneously, so drm_device master points
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* at the top of the tree (for which lessor is NULL). Protected by
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* &drm_device.mode_config.idr_mutex.
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*/
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struct drm_master *lessor;
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int lessee_id;
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struct list_head lessee_list;
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struct list_head lessees;
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struct idr leases;
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struct idr lessee_idr;
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};
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struct drm_master *drm_master_get(struct drm_master *master);
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void drm_master_put(struct drm_master **master);
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bool drm_is_current_master(struct drm_file *fpriv);
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struct drm_master *drm_master_create(struct drm_device *dev);
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#endif
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