87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
|
||
|
|
/*
|
||
|
|
*
|
||
|
|
* Copyright (C) IBM Corporation, 2004
|
||
|
|
*
|
||
|
|
* Author: Max Asböck <amax@us.ibm.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/sched/signal.h>
|
||
|
|
#include "ibmasm.h"
|
||
|
|
#include "dot_command.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Reverse Heartbeat, i.e. heartbeats sent from the driver to the
|
||
|
|
* service processor.
|
||
|
|
* These heartbeats are initiated by user level programs.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* the reverse heartbeat dot command */
|
||
|
|
#pragma pack(1)
|
||
|
|
static struct {
|
||
|
|
struct dot_command_header header;
|
||
|
|
unsigned char command[3];
|
||
|
|
} rhb_dot_cmd = {
|
||
|
|
.header = {
|
||
|
|
.type = sp_read,
|
||
|
|
.command_size = 3,
|
||
|
|
.data_size = 0,
|
||
|
|
.status = 0
|
||
|
|
},
|
||
|
|
.command = { 4, 3, 6 }
|
||
|
|
};
|
||
|
|
#pragma pack()
|
||
|
|
|
||
|
|
void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb)
|
||
|
|
{
|
||
|
|
init_waitqueue_head(&rhb->wait);
|
||
|
|
rhb->stopped = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* start_reverse_heartbeat
|
||
|
|
* Loop forever, sending a reverse heartbeat dot command to the service
|
||
|
|
* processor, then sleeping. The loop comes to an end if the service
|
||
|
|
* processor fails to respond 3 times or we were interrupted.
|
||
|
|
*/
|
||
|
|
int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb)
|
||
|
|
{
|
||
|
|
struct command *cmd;
|
||
|
|
int times_failed = 0;
|
||
|
|
int result = 1;
|
||
|
|
|
||
|
|
cmd = ibmasm_new_command(sp, sizeof rhb_dot_cmd);
|
||
|
|
if (!cmd)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
while (times_failed < 3) {
|
||
|
|
memcpy(cmd->buffer, (void *)&rhb_dot_cmd, sizeof rhb_dot_cmd);
|
||
|
|
cmd->status = IBMASM_CMD_PENDING;
|
||
|
|
ibmasm_exec_command(sp, cmd);
|
||
|
|
ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);
|
||
|
|
|
||
|
|
if (cmd->status != IBMASM_CMD_COMPLETE)
|
||
|
|
times_failed++;
|
||
|
|
|
||
|
|
wait_event_interruptible_timeout(rhb->wait,
|
||
|
|
rhb->stopped,
|
||
|
|
REVERSE_HEARTBEAT_TIMEOUT * HZ);
|
||
|
|
|
||
|
|
if (signal_pending(current) || rhb->stopped) {
|
||
|
|
result = -EINTR;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
command_put(cmd);
|
||
|
|
rhb->stopped = 0;
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb)
|
||
|
|
{
|
||
|
|
rhb->stopped = 1;
|
||
|
|
wake_up_interruptible(&rhb->wait);
|
||
|
|
}
|