[mirror_ubuntu-artful-kernel.git] / drivers / misc / ibmasm / r_heartbeat.c


/*
 * 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/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);
}
Commit	Line	Data
1da177e4 LT	1
	2	/*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License as published by
	5	* the Free Software Foundation; either version 2 of the License, or
	6	* (at your option) any later version.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software
	15	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	16	*
	17	* Copyright (C) IBM Corporation, 2004
	18	*
d36b6910	19	* Author: Max Asböck <amax@us.ibm.com>
1da177e4 LT	20	*
	21	*/
	22
174cd4b1	23	#include <linux/sched/signal.h>
1da177e4 LT	24	#include "ibmasm.h"
	25	#include "dot_command.h"
	26
	27	/*
	28	* Reverse Heartbeat, i.e. heartbeats sent from the driver to the
	29	* service processor.
	30	* These heartbeats are initiated by user level programs.
	31	*/
	32
	33	/* the reverse heartbeat dot command */
	34	#pragma pack(1)
	35	static struct {
	36	struct dot_command_header header;
	37	unsigned char command[3];
	38	} rhb_dot_cmd = {
	39	.header = {
3110dc7a	40	.type = sp_read,
1da177e4 LT	41	.command_size = 3,
1da177e4 LT	42	.data_size = 0,
3110dc7a	43	.status = 0
1da177e4 LT	44	},
	45	.command = { 4, 3, 6 }
	46	};
	47	#pragma pack()
	48
	49	void ibmasm_init_reverse_heartbeat(struct service_processor sp, struct reverse_heartbeat rhb)
	50	{
	51	init_waitqueue_head(&rhb->wait);
	52	rhb->stopped = 0;
	53	}
	54
	55	/**
	56	* start_reverse_heartbeat
	57	* Loop forever, sending a reverse heartbeat dot command to the service
	58	* processor, then sleeping. The loop comes to an end if the service
	59	* processor fails to respond 3 times or we were interrupted.
	60	*/
	61	int ibmasm_start_reverse_heartbeat(struct service_processor sp, struct reverse_heartbeat rhb)
	62	{
	63	struct command *cmd;
	64	int times_failed = 0;
	65	int result = 1;
	66
88187605	67	cmd = ibmasm_new_command(sp, sizeof rhb_dot_cmd);
1da177e4 LT	68	if (!cmd)
	69	return -ENOMEM;
	70
	71	while (times_failed < 3) {
	72	memcpy(cmd->buffer, (void *)&rhb_dot_cmd, sizeof rhb_dot_cmd);
	73	cmd->status = IBMASM_CMD_PENDING;
	74	ibmasm_exec_command(sp, cmd);
	75	ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);
	76
	77	if (cmd->status != IBMASM_CMD_COMPLETE)
	78	times_failed++;
	79
3110dc7a	80	wait_event_interruptible_timeout(rhb->wait,
1da177e4	81	rhb->stopped,
3110dc7a	82	REVERSE_HEARTBEAT_TIMEOUT * HZ);
1da177e4 LT	83
	84	if (signal_pending(current) \|\| rhb->stopped) {
	85	result = -EINTR;
	86	break;
	87	}
	88	}
	89	command_put(cmd);
	90	rhb->stopped = 0;
	91
	92	return result;
	93	}
	94
	95	void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb)
	96	{
	97	rhb->stopped = 1;
	98	wake_up_interruptible(&rhb->wait);
	99	}