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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScorePerCPU
* @ingroup RTEMSScoreSMP
*
* @brief This source file contains the implementation of _Per_CPU_Add_job(),
* _Per_CPU_Perform_jobs(), _Per_CPU_Wait_for_job(), _SMP_Broadcast_action(),
* _SMP_Multicast_action(), _SMP_Othercast_action(), and _SMP_Synchronize().
*/
/*
* Copyright (C) 2019 embedded brains GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/smpimpl.h>
#include <rtems/score/assert.h>
#define _Per_CPU_Jobs_ISR_disable_and_acquire( cpu, lock_context ) \
_ISR_lock_ISR_disable_and_acquire( &( cpu )->Jobs.Lock, lock_context )
#define _Per_CPU_Jobs_release_and_ISR_enable( cpu, lock_context ) \
_ISR_lock_Release_and_ISR_enable( &( cpu )->Jobs.Lock, lock_context )
void _Per_CPU_Perform_jobs( Per_CPU_Control *cpu )
{
ISR_lock_Context lock_context;
Per_CPU_Job *job;
_Per_CPU_Jobs_ISR_disable_and_acquire( cpu, &lock_context );
job = cpu->Jobs.head;
cpu->Jobs.head = NULL;
_Per_CPU_Jobs_release_and_ISR_enable( cpu, &lock_context );
while ( job != NULL ) {
const Per_CPU_Job_context *context;
Per_CPU_Job *next;
context = job->context;
next = job->next;
( *context->handler )( context->arg );
_Atomic_Store_ulong( &job->done, PER_CPU_JOB_DONE, ATOMIC_ORDER_RELEASE );
job = next;
}
}
void _Per_CPU_Add_job( Per_CPU_Control *cpu, Per_CPU_Job *job )
{
ISR_lock_Context lock_context;
_Atomic_Store_ulong( &job->done, 0, ATOMIC_ORDER_RELAXED );
_Assert( job->next == NULL );
_Per_CPU_Jobs_ISR_disable_and_acquire( cpu, &lock_context );
if ( cpu->Jobs.head == NULL ) {
cpu->Jobs.head = job;
} else {
*cpu->Jobs.tail = job;
}
cpu->Jobs.tail = &job->next;
_Per_CPU_Jobs_release_and_ISR_enable( cpu, &lock_context );
}
void _Per_CPU_Wait_for_job(
const Per_CPU_Control *cpu,
const Per_CPU_Job *job
)
{
while (
_Atomic_Load_ulong( &job->done, ATOMIC_ORDER_ACQUIRE )
!= PER_CPU_JOB_DONE
) {
Per_CPU_Control *cpu_self;
switch ( _Per_CPU_Get_state( cpu ) ) {
case PER_CPU_STATE_INITIAL:
case PER_CPU_STATE_READY_TO_START_MULTITASKING:
case PER_CPU_STATE_UP:
/*
* Calling this function with the current processor is intentional. We
* have to perform our own jobs here in case inter-processor interrupts
* are not working.
*/
cpu_self = _Per_CPU_Get();
_SMP_Try_to_process_message(
cpu_self,
_Atomic_Load_ulong( &cpu_self->message, ATOMIC_ORDER_RELAXED )
);
break;
default:
_SMP_Fatal( SMP_FATAL_WRONG_CPU_STATE_TO_PERFORM_JOBS );
break;
}
}
}
typedef struct {
Per_CPU_Job_context Context;
Per_CPU_Job Jobs[ CPU_MAXIMUM_PROCESSORS ];
} SMP_Multicast_jobs;
static void _SMP_Issue_action_jobs(
const Processor_mask *targets,
SMP_Multicast_jobs *jobs,
uint32_t cpu_max
)
{
uint32_t cpu_index;
for ( cpu_index = 0; cpu_index < cpu_max; ++cpu_index ) {
if ( _Processor_mask_Is_set( targets, cpu_index ) ) {
Per_CPU_Job *job;
Per_CPU_Control *cpu;
job = &jobs->Jobs[ cpu_index ];
job->context = &jobs->Context;
cpu = _Per_CPU_Get_by_index( cpu_index );
_Per_CPU_Add_job( cpu, job );
_SMP_Send_message( cpu_index, SMP_MESSAGE_PERFORM_JOBS );
}
}
}
static void _SMP_Wait_for_action_jobs(
const Processor_mask *targets,
const SMP_Multicast_jobs *jobs,
uint32_t cpu_max
)
{
uint32_t cpu_index;
for ( cpu_index = 0; cpu_index < cpu_max; ++cpu_index ) {
if ( _Processor_mask_Is_set( targets, cpu_index ) ) {
const Per_CPU_Control *cpu;
const Per_CPU_Job *job;
cpu = _Per_CPU_Get_by_index( cpu_index );
job = &jobs->Jobs[ cpu_index ];
_Per_CPU_Wait_for_job( cpu, job );
}
}
}
void _SMP_Multicast_action(
const Processor_mask *targets,
SMP_Action_handler handler,
void *arg
)
{
SMP_Multicast_jobs jobs;
uint32_t cpu_max;
cpu_max = _SMP_Get_processor_maximum();
_Assert( cpu_max <= RTEMS_ARRAY_SIZE( jobs.Jobs ) );
jobs.Context.handler = handler;
jobs.Context.arg = arg;
_SMP_Issue_action_jobs( targets, &jobs, cpu_max );
_SMP_Wait_for_action_jobs( targets, &jobs, cpu_max );
}
void _SMP_Broadcast_action(
SMP_Action_handler handler,
void *arg
)
{
_SMP_Multicast_action( _SMP_Get_online_processors(), handler, arg );
}
void _SMP_Othercast_action(
SMP_Action_handler handler,
void *arg
)
{
Processor_mask targets;
_Processor_mask_Assign( &targets, _SMP_Get_online_processors() );
_Processor_mask_Clear( &targets, _SMP_Get_current_processor() );
_SMP_Multicast_action( &targets, handler, arg );
}
static void _SMP_Do_nothing_action( void *arg )
{
/* Do nothing */
}
void _SMP_Synchronize( void )
{
_SMP_Othercast_action( _SMP_Do_nothing_action, NULL );
}
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