LCOV - code coverage report
Current view: top level - include/linux - async.h (source / functions) Hit Total Coverage
Test: combined.info Lines: 4 6 66.7 %
Date: 2022-04-01 14:58:12 Functions: 0 0 -
Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0-only */
       2                 :            : /*
       3                 :            :  * async.h: Asynchronous function calls for boot performance
       4                 :            :  *
       5                 :            :  * (C) Copyright 2009 Intel Corporation
       6                 :            :  * Author: Arjan van de Ven <arjan@linux.intel.com>
       7                 :            :  */
       8                 :            : #ifndef __ASYNC_H__
       9                 :            : #define __ASYNC_H__
      10                 :            : 
      11                 :            : #include <linux/types.h>
      12                 :            : #include <linux/list.h>
      13                 :            : #include <linux/numa.h>
      14                 :            : #include <linux/device.h>
      15                 :            : 
      16                 :            : typedef u64 async_cookie_t;
      17                 :            : typedef void (*async_func_t) (void *data, async_cookie_t cookie);
      18                 :            : struct async_domain {
      19                 :            :         struct list_head pending;
      20                 :            :         unsigned registered:1;
      21                 :            : };
      22                 :            : 
      23                 :            : /*
      24                 :            :  * domain participates in global async_synchronize_full
      25                 :            :  */
      26                 :            : #define ASYNC_DOMAIN(_name) \
      27                 :            :         struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending), \
      28                 :            :                                       .registered = 1 }
      29                 :            : 
      30                 :            : /*
      31                 :            :  * domain is free to go out of scope as soon as all pending work is
      32                 :            :  * complete, this domain does not participate in async_synchronize_full
      33                 :            :  */
      34                 :            : #define ASYNC_DOMAIN_EXCLUSIVE(_name) \
      35                 :            :         struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending), \
      36                 :            :                                       .registered = 0 }
      37                 :            : 
      38                 :            : async_cookie_t async_schedule_node(async_func_t func, void *data,
      39                 :            :                                    int node);
      40                 :            : async_cookie_t async_schedule_node_domain(async_func_t func, void *data,
      41                 :            :                                           int node,
      42                 :            :                                           struct async_domain *domain);
      43                 :            : 
      44                 :            : /**
      45                 :            :  * async_schedule - schedule a function for asynchronous execution
      46                 :            :  * @func: function to execute asynchronously
      47                 :            :  * @data: data pointer to pass to the function
      48                 :            :  *
      49                 :            :  * Returns an async_cookie_t that may be used for checkpointing later.
      50                 :            :  * Note: This function may be called from atomic or non-atomic contexts.
      51                 :            :  */
      52                 :          9 : static inline async_cookie_t async_schedule(async_func_t func, void *data)
      53                 :            : {
      54                 :          9 :         return async_schedule_node(func, data, NUMA_NO_NODE);
      55                 :            : }
      56                 :            : 
      57                 :            : /**
      58                 :            :  * async_schedule_domain - schedule a function for asynchronous execution within a certain domain
      59                 :            :  * @func: function to execute asynchronously
      60                 :            :  * @data: data pointer to pass to the function
      61                 :            :  * @domain: the domain
      62                 :            :  *
      63                 :            :  * Returns an async_cookie_t that may be used for checkpointing later.
      64                 :            :  * @domain may be used in the async_synchronize_*_domain() functions to
      65                 :            :  * wait within a certain synchronization domain rather than globally.
      66                 :            :  * Note: This function may be called from atomic or non-atomic contexts.
      67                 :            :  */
      68                 :            : static inline async_cookie_t
      69                 :          0 : async_schedule_domain(async_func_t func, void *data,
      70                 :            :                       struct async_domain *domain)
      71                 :            : {
      72                 :          0 :         return async_schedule_node_domain(func, data, NUMA_NO_NODE, domain);
      73                 :            : }
      74                 :            : 
      75                 :            : /**
      76                 :            :  * async_schedule_dev - A device specific version of async_schedule
      77                 :            :  * @func: function to execute asynchronously
      78                 :            :  * @dev: device argument to be passed to function
      79                 :            :  *
      80                 :            :  * Returns an async_cookie_t that may be used for checkpointing later.
      81                 :            :  * @dev is used as both the argument for the function and to provide NUMA
      82                 :            :  * context for where to run the function. By doing this we can try to
      83                 :            :  * provide for the best possible outcome by operating on the device on the
      84                 :            :  * CPUs closest to the device.
      85                 :            :  * Note: This function may be called from atomic or non-atomic contexts.
      86                 :            :  */
      87                 :            : static inline async_cookie_t
      88                 :          6 : async_schedule_dev(async_func_t func, struct device *dev)
      89                 :            : {
      90                 :          6 :         return async_schedule_node(func, dev, dev_to_node(dev));
      91                 :            : }
      92                 :            : 
      93                 :            : /**
      94                 :            :  * async_schedule_dev_domain - A device specific version of async_schedule_domain
      95                 :            :  * @func: function to execute asynchronously
      96                 :            :  * @dev: device argument to be passed to function
      97                 :            :  * @domain: the domain
      98                 :            :  *
      99                 :            :  * Returns an async_cookie_t that may be used for checkpointing later.
     100                 :            :  * @dev is used as both the argument for the function and to provide NUMA
     101                 :            :  * context for where to run the function. By doing this we can try to
     102                 :            :  * provide for the best possible outcome by operating on the device on the
     103                 :            :  * CPUs closest to the device.
     104                 :            :  * @domain may be used in the async_synchronize_*_domain() functions to
     105                 :            :  * wait within a certain synchronization domain rather than globally.
     106                 :            :  * Note: This function may be called from atomic or non-atomic contexts.
     107                 :            :  */
     108                 :            : static inline async_cookie_t
     109                 :            : async_schedule_dev_domain(async_func_t func, struct device *dev,
     110                 :            :                           struct async_domain *domain)
     111                 :            : {
     112                 :            :         return async_schedule_node_domain(func, dev, dev_to_node(dev), domain);
     113                 :            : }
     114                 :            : 
     115                 :            : void async_unregister_domain(struct async_domain *domain);
     116                 :            : extern void async_synchronize_full(void);
     117                 :            : extern void async_synchronize_full_domain(struct async_domain *domain);
     118                 :            : extern void async_synchronize_cookie(async_cookie_t cookie);
     119                 :            : extern void async_synchronize_cookie_domain(async_cookie_t cookie,
     120                 :            :                                             struct async_domain *domain);
     121                 :            : extern bool current_is_async(void);
     122                 :            : #endif

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