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/*
* async.h: Asynchronous function calls for boot performance
*
* (C) Copyright 2009 Intel Corporation
* Author: Arjan van de Ven <arjan@linux.intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; version 2
* of the License.
*/
#ifndef __ASYNC_H__
#define __ASYNC_H__
#include <linux/types.h>
#include <linux/list.h>
#include <linux/numa.h>
#include <linux/device.h>
typedef u64 async_cookie_t;
typedef void (*async_func_t) (void *data, async_cookie_t cookie);
struct async_domain {
struct list_head pending;
unsigned registered:1;
};
/*
* domain participates in global async_synchronize_full
*/
#define ASYNC_DOMAIN(_name) \
struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending), \
.registered = 1 }
/*
* domain is free to go out of scope as soon as all pending work is
* complete, this domain does not participate in async_synchronize_full
*/
#define ASYNC_DOMAIN_EXCLUSIVE(_name) \
struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending), \
.registered = 0 }
async_cookie_t async_schedule_node(async_func_t func, void *data,
int node);
async_cookie_t async_schedule_node_domain(async_func_t func, void *data,
int node,
struct async_domain *domain);
/**
* async_schedule - schedule a function for asynchronous execution
* @func: function to execute asynchronously
* @data: data pointer to pass to the function
*
* Returns an async_cookie_t that may be used for checkpointing later.
* Note: This function may be called from atomic or non-atomic contexts.
*/
static inline async_cookie_t async_schedule(async_func_t func, void *data)
{
return async_schedule_node(func, data, NUMA_NO_NODE);
}
/**
* async_schedule_domain - schedule a function for asynchronous execution within a certain domain
* @func: function to execute asynchronously
* @data: data pointer to pass to the function
* @domain: the domain
*
* Returns an async_cookie_t that may be used for checkpointing later.
* @domain may be used in the async_synchronize_*_domain() functions to
* wait within a certain synchronization domain rather than globally.
* Note: This function may be called from atomic or non-atomic contexts.
*/
static inline async_cookie_t
async_schedule_domain(async_func_t func, void *data,
struct async_domain *domain)
{
return async_schedule_node_domain(func, data, NUMA_NO_NODE, domain);
}
/**
* async_schedule_dev - A device specific version of async_schedule
* @func: function to execute asynchronously
* @dev: device argument to be passed to function
*
* Returns an async_cookie_t that may be used for checkpointing later.
* @dev is used as both the argument for the function and to provide NUMA
* context for where to run the function. By doing this we can try to
* provide for the best possible outcome by operating on the device on the
* CPUs closest to the device.
* Note: This function may be called from atomic or non-atomic contexts.
*/
static inline async_cookie_t
async_schedule_dev(async_func_t func, struct device *dev)
{
return async_schedule_node(func, dev, dev_to_node(dev));
}
/**
* async_schedule_dev_domain - A device specific version of async_schedule_domain
* @func: function to execute asynchronously
* @dev: device argument to be passed to function
* @domain: the domain
*
* Returns an async_cookie_t that may be used for checkpointing later.
* @dev is used as both the argument for the function and to provide NUMA
* context for where to run the function. By doing this we can try to
* provide for the best possible outcome by operating on the device on the
* CPUs closest to the device.
* @domain may be used in the async_synchronize_*_domain() functions to
* wait within a certain synchronization domain rather than globally.
* Note: This function may be called from atomic or non-atomic contexts.
*/
static inline async_cookie_t
async_schedule_dev_domain(async_func_t func, struct device *dev,
struct async_domain *domain)
{
return async_schedule_node_domain(func, dev, dev_to_node(dev), domain);
}
void async_unregister_domain(struct async_domain *domain);
extern void async_synchronize_full(void);
extern void async_synchronize_full_domain(struct async_domain *domain);
extern void async_synchronize_cookie(async_cookie_t cookie);
extern void async_synchronize_cookie_domain(async_cookie_t cookie,
struct async_domain *domain);
extern bool current_is_async(void);
#endif
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