/* * 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 Asb�ck <amax@us.ibm.com> * */ #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); }