102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
|
|
/*
|
|
* IBM ASM Service Processor Device Driver
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* Copyright (C) IBM Corporation, 2004
|
|
*
|
|
* Author: Max Asböck <amax@us.ibm.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/notifier.h>
|
|
#include "ibmasm.h"
|
|
#include "dot_command.h"
|
|
#include "lowlevel.h"
|
|
|
|
static int suspend_heartbeats = 0;
|
|
|
|
/*
|
|
* Once the driver indicates to the service processor that it is running
|
|
* - see send_os_state() - the service processor sends periodic heartbeats
|
|
* to the driver. The driver must respond to the heartbeats or else the OS
|
|
* will be rebooted.
|
|
* In the case of a panic the interrupt handler continues to work and thus
|
|
* continues to respond to heartbeats, making the service processor believe
|
|
* the OS is still running and thus preventing a reboot.
|
|
* To prevent this from happening a callback is added the panic_notifier_list.
|
|
* Before responding to a heartbeat the driver checks if a panic has happened,
|
|
* if yes it suspends heartbeat, causing the service processor to reboot as
|
|
* expected.
|
|
*/
|
|
static int panic_happened(struct notifier_block *n, unsigned long val, void *v)
|
|
{
|
|
suspend_heartbeats = 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block panic_notifier = { panic_happened, NULL, 1 };
|
|
|
|
void ibmasm_register_panic_notifier(void)
|
|
{
|
|
atomic_notifier_chain_register(&panic_notifier_list, &panic_notifier);
|
|
}
|
|
|
|
void ibmasm_unregister_panic_notifier(void)
|
|
{
|
|
atomic_notifier_chain_unregister(&panic_notifier_list,
|
|
&panic_notifier);
|
|
}
|
|
|
|
|
|
int ibmasm_heartbeat_init(struct service_processor *sp)
|
|
{
|
|
sp->heartbeat = ibmasm_new_command(sp, HEARTBEAT_BUFFER_SIZE);
|
|
if (sp->heartbeat == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ibmasm_heartbeat_exit(struct service_processor *sp)
|
|
{
|
|
char tsbuf[32];
|
|
|
|
dbg("%s:%d at %s\n", __func__, __LINE__, get_timestamp(tsbuf));
|
|
ibmasm_wait_for_response(sp->heartbeat, IBMASM_CMD_TIMEOUT_NORMAL);
|
|
dbg("%s:%d at %s\n", __func__, __LINE__, get_timestamp(tsbuf));
|
|
suspend_heartbeats = 1;
|
|
command_put(sp->heartbeat);
|
|
}
|
|
|
|
void ibmasm_receive_heartbeat(struct service_processor *sp, void *message, size_t size)
|
|
{
|
|
struct command *cmd = sp->heartbeat;
|
|
struct dot_command_header *header = (struct dot_command_header *)cmd->buffer;
|
|
char tsbuf[32];
|
|
|
|
dbg("%s:%d at %s\n", __func__, __LINE__, get_timestamp(tsbuf));
|
|
if (suspend_heartbeats)
|
|
return;
|
|
|
|
/* return the received dot command to sender */
|
|
cmd->status = IBMASM_CMD_PENDING;
|
|
size = min(size, cmd->buffer_size);
|
|
memcpy_fromio(cmd->buffer, message, size);
|
|
header->type = sp_write;
|
|
ibmasm_exec_command(sp, cmd);
|
|
}
|