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// 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);
}
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