cregit-Linux how code gets into the kernel

Release 4.12 include/linux/reservation.h

Directory: include/linux
/*
 * Header file for reservations for dma-buf and ttm
 *
 * Copyright(C) 2011 Linaro Limited. All rights reserved.
 * Copyright (C) 2012-2013 Canonical Ltd
 * Copyright (C) 2012 Texas Instruments
 *
 * Authors:
 * Rob Clark <robdclark@gmail.com>
 * Maarten Lankhorst <maarten.lankhorst@canonical.com>
 * Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 *
 * Based on bo.c which bears the following copyright notice,
 * but is dual licensed:
 *
 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS 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 _LINUX_RESERVATION_H

#define _LINUX_RESERVATION_H

#include <linux/ww_mutex.h>
#include <linux/dma-fence.h>
#include <linux/slab.h>
#include <linux/seqlock.h>
#include <linux/rcupdate.h>

extern struct ww_class reservation_ww_class;
extern struct lock_class_key reservation_seqcount_class;
extern const char reservation_seqcount_string[];

/**
 * struct reservation_object_list - a list of shared fences
 * @rcu: for internal use
 * @shared_count: table of shared fences
 * @shared_max: for growing shared fence table
 * @shared: shared fence table
 */

struct reservation_object_list {
	
struct rcu_head rcu;
	

u32 shared_count, shared_max;
	
struct dma_fence __rcu *shared[];
};

/**
 * struct reservation_object - a reservation object manages fences for a buffer
 * @lock: update side lock
 * @seq: sequence count for managing RCU read-side synchronization
 * @fence_excl: the exclusive fence, if there is one currently
 * @fence: list of current shared fences
 * @staged: staged copy of shared fences for RCU updates
 */

struct reservation_object {
	
struct ww_mutex lock;
	
seqcount_t seq;

	
struct dma_fence __rcu *fence_excl;
	
struct reservation_object_list __rcu *fence;
	
struct reservation_object_list *staged;
};


#define reservation_object_held(obj) lockdep_is_held(&(obj)->lock.base)

#define reservation_object_assert_held(obj) \
	lockdep_assert_held(&(obj)->lock.base)

/**
 * reservation_object_init - initialize a reservation object
 * @obj: the reservation object
 */

static inline void reservation_object_init(struct reservation_object *obj) { ww_mutex_init(&obj->lock, &reservation_ww_class); __seqcount_init(&obj->seq, reservation_seqcount_string, &reservation_seqcount_class); RCU_INIT_POINTER(obj->fence, NULL); RCU_INIT_POINTER(obj->fence_excl, NULL); obj->staged = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Maarten Lankhorst60100.00%4100.00%
Total60100.00%4100.00%

/** * reservation_object_fini - destroys a reservation object * @obj: the reservation object */
static inline void reservation_object_fini(struct reservation_object *obj) { int i; struct reservation_object_list *fobj; struct dma_fence *excl; /* * This object should be dead and all references must have * been released to it, so no need to be protected with rcu. */ excl = rcu_dereference_protected(obj->fence_excl, 1); if (excl) dma_fence_put(excl); fobj = rcu_dereference_protected(obj->fence, 1); if (fobj) { for (i = 0; i < fobj->shared_count; ++i) dma_fence_put(rcu_dereference_protected(fobj->shared[i], 1)); kfree(fobj); } kfree(obj->staged); ww_mutex_destroy(&obj->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Maarten Lankhorst11097.35%480.00%
Chris Wilson32.65%120.00%
Total113100.00%5100.00%

/** * reservation_object_get_list - get the reservation object's * shared fence list, with update-side lock held * @obj: the reservation object * * Returns the shared fence list. Does NOT take references to * the fence. The obj->lock must be held. */
static inline struct reservation_object_list * reservation_object_get_list(struct reservation_object *obj) { return rcu_dereference_protected(obj->fence, reservation_object_held(obj)); }

Contributors

PersonTokensPropCommitsCommitProp
Maarten Lankhorst27100.00%2100.00%
Total27100.00%2100.00%

/** * reservation_object_lock - lock the reservation object * @obj: the reservation object * @ctx: the locking context * * Locks the reservation object for exclusive access and modification. Note, * that the lock is only against other writers, readers will run concurrently * with a writer under RCU. The seqlock is used to notify readers if they * overlap with a writer. * * As the reservation object may be locked by multiple parties in an * undefined order, a #ww_acquire_ctx is passed to unwind if a cycle * is detected. See ww_mutex_lock() and ww_acquire_init(). A reservation * object may be locked by itself by passing NULL as @ctx. */
static inline int reservation_object_lock(struct reservation_object *obj, struct ww_acquire_ctx *ctx) { return ww_mutex_lock(&obj->lock, ctx); }

Contributors

PersonTokensPropCommitsCommitProp
Chris Wilson28100.00%1100.00%
Total28100.00%1100.00%

/** * reservation_object_trylock - trylock the reservation object * @obj: the reservation object * * Tries to lock the reservation object for exclusive access and modification. * Note, that the lock is only against other writers, readers will run * concurrently with a writer under RCU. The seqlock is used to notify readers * if they overlap with a writer. * * Also note that since no context is provided, no deadlock protection is * possible. * * Returns true if the lock was acquired, false otherwise. */
static inline bool __must_check reservation_object_trylock(struct reservation_object *obj) { return ww_mutex_trylock(&obj->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Chris Wilson22100.00%1100.00%
Total22100.00%1100.00%

/** * reservation_object_unlock - unlock the reservation object * @obj: the reservation object * * Unlocks the reservation object following exclusive access. */
static inline void reservation_object_unlock(struct reservation_object *obj) { ww_mutex_unlock(&obj->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Chris Wilson20100.00%1100.00%
Total20100.00%1100.00%

/** * reservation_object_get_excl - get the reservation object's * exclusive fence, with update-side lock held * @obj: the reservation object * * Returns the exclusive fence (if any). Does NOT take a * reference. The obj->lock must be held. * * RETURNS * The exclusive fence or NULL */
static inline struct dma_fence * reservation_object_get_excl(struct reservation_object *obj) { return rcu_dereference_protected(obj->fence_excl, reservation_object_held(obj)); }

Contributors

PersonTokensPropCommitsCommitProp
Maarten Lankhorst2696.30%266.67%
Chris Wilson13.70%133.33%
Total27100.00%3100.00%

/** * reservation_object_get_excl_rcu - get the reservation object's * exclusive fence, without lock held. * @obj: the reservation object * * If there is an exclusive fence, this atomically increments it's * reference count and returns it. * * RETURNS * The exclusive fence or NULL if none */
static inline struct dma_fence * reservation_object_get_excl_rcu(struct reservation_object *obj) { struct dma_fence *fence; if (!rcu_access_pointer(obj->fence_excl)) return NULL; rcu_read_lock(); fence = dma_fence_get_rcu_safe(&obj->fence_excl); rcu_read_unlock(); return fence; }

Contributors

PersonTokensPropCommitsCommitProp
Rob Clark3874.51%133.33%
Chris Wilson1325.49%266.67%
Total51100.00%3100.00%

int reservation_object_reserve_shared(struct reservation_object *obj); void reservation_object_add_shared_fence(struct reservation_object *obj, struct dma_fence *fence); void reservation_object_add_excl_fence(struct reservation_object *obj, struct dma_fence *fence); int reservation_object_get_fences_rcu(struct reservation_object *obj, struct dma_fence **pfence_excl, unsigned *pshared_count, struct dma_fence ***pshared); long reservation_object_wait_timeout_rcu(struct reservation_object *obj, bool wait_all, bool intr, unsigned long timeout); bool reservation_object_test_signaled_rcu(struct reservation_object *obj, bool test_all); #endif /* _LINUX_RESERVATION_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Maarten Lankhorst41674.55%545.45%
Chris Wilson9717.38%436.36%
Rob Clark458.06%218.18%
Total558100.00%11100.00%
Directory: include/linux
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