forked from mirrors/linux
7d4b5d7a37
In preparation for subsequent changes, introduce a specialized variant of async_schedule_dev() that will not invoke the argument function synchronously when it cannot be scheduled for asynchronous execution. The new function, async_schedule_dev_nocall(), will be used for fixing possible deadlocks in the system-wide power management core code. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> for the series. Tested-by: Youngmin Nam <youngmin.nam@samsung.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
123 lines
4.3 KiB
C
123 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* async.h: Asynchronous function calls for boot performance
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*
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* (C) Copyright 2009 Intel Corporation
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* Author: Arjan van de Ven <arjan@linux.intel.com>
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*/
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#ifndef __ASYNC_H__
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#define __ASYNC_H__
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/numa.h>
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#include <linux/device.h>
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typedef u64 async_cookie_t;
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typedef void (*async_func_t) (void *data, async_cookie_t cookie);
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struct async_domain {
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struct list_head pending;
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unsigned registered:1;
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};
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/*
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* domain participates in global async_synchronize_full
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*/
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#define ASYNC_DOMAIN(_name) \
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struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending), \
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.registered = 1 }
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/*
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* domain is free to go out of scope as soon as all pending work is
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* complete, this domain does not participate in async_synchronize_full
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*/
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#define ASYNC_DOMAIN_EXCLUSIVE(_name) \
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struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending), \
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.registered = 0 }
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async_cookie_t async_schedule_node(async_func_t func, void *data,
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int node);
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async_cookie_t async_schedule_node_domain(async_func_t func, void *data,
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int node,
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struct async_domain *domain);
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/**
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* async_schedule - schedule a function for asynchronous execution
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* @func: function to execute asynchronously
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* @data: data pointer to pass to the function
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*
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* Returns an async_cookie_t that may be used for checkpointing later.
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* Note: This function may be called from atomic or non-atomic contexts.
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*/
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static inline async_cookie_t async_schedule(async_func_t func, void *data)
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{
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return async_schedule_node(func, data, NUMA_NO_NODE);
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}
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/**
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* async_schedule_domain - schedule a function for asynchronous execution within a certain domain
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* @func: function to execute asynchronously
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* @data: data pointer to pass to the function
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* @domain: the domain
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*
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* Returns an async_cookie_t that may be used for checkpointing later.
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* @domain may be used in the async_synchronize_*_domain() functions to
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* wait within a certain synchronization domain rather than globally.
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* Note: This function may be called from atomic or non-atomic contexts.
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*/
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static inline async_cookie_t
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async_schedule_domain(async_func_t func, void *data,
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struct async_domain *domain)
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{
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return async_schedule_node_domain(func, data, NUMA_NO_NODE, domain);
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}
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/**
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* async_schedule_dev - A device specific version of async_schedule
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* @func: function to execute asynchronously
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* @dev: device argument to be passed to function
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*
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* Returns an async_cookie_t that may be used for checkpointing later.
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* @dev is used as both the argument for the function and to provide NUMA
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* context for where to run the function. By doing this we can try to
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* provide for the best possible outcome by operating on the device on the
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* CPUs closest to the device.
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* Note: This function may be called from atomic or non-atomic contexts.
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*/
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static inline async_cookie_t
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async_schedule_dev(async_func_t func, struct device *dev)
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{
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return async_schedule_node(func, dev, dev_to_node(dev));
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}
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bool async_schedule_dev_nocall(async_func_t func, struct device *dev);
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/**
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* async_schedule_dev_domain - A device specific version of async_schedule_domain
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* @func: function to execute asynchronously
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* @dev: device argument to be passed to function
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* @domain: the domain
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*
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* Returns an async_cookie_t that may be used for checkpointing later.
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* @dev is used as both the argument for the function and to provide NUMA
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* context for where to run the function. By doing this we can try to
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* provide for the best possible outcome by operating on the device on the
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* CPUs closest to the device.
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* @domain may be used in the async_synchronize_*_domain() functions to
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* wait within a certain synchronization domain rather than globally.
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* Note: This function may be called from atomic or non-atomic contexts.
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*/
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static inline async_cookie_t
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async_schedule_dev_domain(async_func_t func, struct device *dev,
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struct async_domain *domain)
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{
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return async_schedule_node_domain(func, dev, dev_to_node(dev), domain);
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}
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extern void async_synchronize_full(void);
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extern void async_synchronize_full_domain(struct async_domain *domain);
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extern void async_synchronize_cookie(async_cookie_t cookie);
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extern void async_synchronize_cookie_domain(async_cookie_t cookie,
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struct async_domain *domain);
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extern bool current_is_async(void);
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#endif
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