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2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
214 lines
6.4 KiB
C
214 lines
6.4 KiB
C
/*
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* Header file for reservations for dma-buf and ttm
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*
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* Copyright(C) 2011 Linaro Limited. All rights reserved.
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* Copyright (C) 2012-2013 Canonical Ltd
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* Copyright (C) 2012 Texas Instruments
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*
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* Authors:
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* Rob Clark <robdclark@gmail.com>
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* Maarten Lankhorst <maarten.lankhorst@canonical.com>
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* Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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*
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* Based on bo.c which bears the following copyright notice,
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* but is dual licensed:
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _LINUX_RESERVATION_H
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#define _LINUX_RESERVATION_H
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#include <linux/ww_mutex.h>
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#include <linux/fence.h>
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#include <linux/slab.h>
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#include <linux/seqlock.h>
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#include <linux/rcupdate.h>
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extern struct ww_class reservation_ww_class;
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extern struct lock_class_key reservation_seqcount_class;
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extern const char reservation_seqcount_string[];
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/**
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* struct reservation_object_list - a list of shared fences
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* @rcu: for internal use
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* @shared_count: table of shared fences
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* @shared_max: for growing shared fence table
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* @shared: shared fence table
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*/
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struct reservation_object_list {
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struct rcu_head rcu;
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u32 shared_count, shared_max;
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struct fence __rcu *shared[];
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};
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/**
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* struct reservation_object - a reservation object manages fences for a buffer
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* @lock: update side lock
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* @seq: sequence count for managing RCU read-side synchronization
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* @fence_excl: the exclusive fence, if there is one currently
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* @fence: list of current shared fences
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* @staged: staged copy of shared fences for RCU updates
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*/
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struct reservation_object {
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struct ww_mutex lock;
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seqcount_t seq;
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struct fence __rcu *fence_excl;
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struct reservation_object_list __rcu *fence;
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struct reservation_object_list *staged;
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};
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#define reservation_object_held(obj) lockdep_is_held(&(obj)->lock.base)
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#define reservation_object_assert_held(obj) \
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lockdep_assert_held(&(obj)->lock.base)
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/**
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* reservation_object_init - initialize a reservation object
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* @obj: the reservation object
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*/
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static inline void
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reservation_object_init(struct reservation_object *obj)
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{
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ww_mutex_init(&obj->lock, &reservation_ww_class);
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__seqcount_init(&obj->seq, reservation_seqcount_string, &reservation_seqcount_class);
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RCU_INIT_POINTER(obj->fence, NULL);
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RCU_INIT_POINTER(obj->fence_excl, NULL);
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obj->staged = NULL;
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}
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/**
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* reservation_object_fini - destroys a reservation object
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* @obj: the reservation object
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*/
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static inline void
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reservation_object_fini(struct reservation_object *obj)
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{
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int i;
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struct reservation_object_list *fobj;
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struct fence *excl;
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/*
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* This object should be dead and all references must have
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* been released to it, so no need to be protected with rcu.
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*/
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excl = rcu_dereference_protected(obj->fence_excl, 1);
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if (excl)
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fence_put(excl);
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fobj = rcu_dereference_protected(obj->fence, 1);
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if (fobj) {
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for (i = 0; i < fobj->shared_count; ++i)
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fence_put(rcu_dereference_protected(fobj->shared[i], 1));
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kfree(fobj);
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}
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kfree(obj->staged);
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ww_mutex_destroy(&obj->lock);
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}
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/**
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* reservation_object_get_list - get the reservation object's
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* shared fence list, with update-side lock held
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* @obj: the reservation object
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*
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* Returns the shared fence list. Does NOT take references to
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* the fence. The obj->lock must be held.
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*/
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static inline struct reservation_object_list *
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reservation_object_get_list(struct reservation_object *obj)
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{
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return rcu_dereference_protected(obj->fence,
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reservation_object_held(obj));
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}
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/**
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* reservation_object_get_excl - get the reservation object's
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* exclusive fence, with update-side lock held
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* @obj: the reservation object
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*
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* Returns the exclusive fence (if any). Does NOT take a
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* reference. The obj->lock must be held.
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*
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* RETURNS
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* The exclusive fence or NULL
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*/
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static inline struct fence *
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reservation_object_get_excl(struct reservation_object *obj)
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{
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return rcu_dereference_protected(obj->fence_excl,
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reservation_object_held(obj));
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}
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/**
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* reservation_object_get_excl_rcu - get the reservation object's
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* exclusive fence, without lock held.
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* @obj: the reservation object
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*
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* If there is an exclusive fence, this atomically increments it's
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* reference count and returns it.
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*
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* RETURNS
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* The exclusive fence or NULL if none
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*/
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static inline struct fence *
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reservation_object_get_excl_rcu(struct reservation_object *obj)
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{
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struct fence *fence;
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unsigned seq;
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retry:
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seq = read_seqcount_begin(&obj->seq);
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rcu_read_lock();
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fence = rcu_dereference(obj->fence_excl);
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if (read_seqcount_retry(&obj->seq, seq)) {
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rcu_read_unlock();
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goto retry;
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}
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fence = fence_get(fence);
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rcu_read_unlock();
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return fence;
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}
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int reservation_object_reserve_shared(struct reservation_object *obj);
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void reservation_object_add_shared_fence(struct reservation_object *obj,
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struct fence *fence);
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void reservation_object_add_excl_fence(struct reservation_object *obj,
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struct fence *fence);
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int reservation_object_get_fences_rcu(struct reservation_object *obj,
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struct fence **pfence_excl,
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unsigned *pshared_count,
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struct fence ***pshared);
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long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
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bool wait_all, bool intr,
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unsigned long timeout);
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bool reservation_object_test_signaled_rcu(struct reservation_object *obj,
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bool test_all);
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#endif /* _LINUX_RESERVATION_H */
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