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:ǿ ? /* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Definitions for the 'struct ptr_ring' datastructure.
*
* Author:
* Michael S. Tsirkin
*
* Copyright (C) 2016 Red Hat, Inc.
*
* This is a limited-size FIFO maintaining pointers in FIFO order, with
* one CPU producing entries and another consuming entries from a FIFO.
*
* This implementation tries to minimize cache-contention when there is a
* single producer and a single consumer CPU.
*/
#ifndef _LINUX_PTR_RING_H
#define _LINUX_PTR_RING_H 1
#ifdef __KERNEL__
#include
#include
#include
#include
#include
#include
#include
#endif
struct ptr_ring {
int producer ____cacheline_aligned_in_smp;
spinlock_t producer_lock;
int consumer_head ____cacheline_aligned_in_smp; /* next valid entry */
int consumer_tail; /* next entry to invalidate */
spinlock_t consumer_lock;
/* Shared consumer/producer data */
/* Read-only by both the producer and the consumer */
int size ____cacheline_aligned_in_smp; /* max entries in queue */
int batch; /* number of entries to consume in a batch */
void **queue;
};
/* Note: callers invoking this in a loop must use a compiler barrier,
* for example cpu_relax().
*
* NB: this is unlike __ptr_ring_empty in that callers must hold producer_lock:
* see e.g. ptr_ring_full.
*/
static inline bool __ptr_ring_full(struct ptr_ring *r)
{
return r->queue[r->producer];
}
static inline bool ptr_ring_full(struct ptr_ring *r)
{
bool ret;
spin_lock(&r->producer_lock);
ret = __ptr_ring_full(r);
spin_unlock(&r->producer_lock);
return ret;
}
stat