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 * 19 * Author: Max Asb�ck <amax@us.ibm.com> 20 * 21 */ 22 23 #include "ibmasm.h" 24 #include "dot_command.h" 25 26 /* 27 * Reverse Heartbeat, i.e. heartbeats sent from the driver to the 28 * service processor. 29 * These heartbeats are initiated by user level programs. 30 */ 31 32 /* the reverse heartbeat dot command */ 33 #pragma pack(1) 34 static struct { 35 struct dot_command_header header; 36 unsigned char command[3]; 37 } rhb_dot_cmd = { 38 .header = { 39 .type = sp_read, 40 .command_size = 3, 41 .data_size = 0, 42 .status = 0 43 }, 44 .command = { 4, 3, 6 } 45 }; 46 #pragma pack() 47 48 void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb) 49 { 50 init_waitqueue_head(&rhb->wait); 51 rhb->stopped = 0; 52 } 53 54 /** 55 * start_reverse_heartbeat 56 * Loop forever, sending a reverse heartbeat dot command to the service 57 * processor, then sleeping. The loop comes to an end if the service 58 * processor fails to respond 3 times or we were interrupted. 59 */ 60 int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb) 61 { 62 struct command *cmd; 63 int times_failed = 0; 64 int result = 1; 65 66 cmd = ibmasm_new_command(sp, sizeof rhb_dot_cmd); 67 if (!cmd) 68 return -ENOMEM; 69 70 while (times_failed < 3) { 71 memcpy(cmd->buffer, (void *)&rhb_dot_cmd, sizeof rhb_dot_cmd); 72 cmd->status = IBMASM_CMD_PENDING; 73 ibmasm_exec_command(sp, cmd); 74 ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL); 75 76 if (cmd->status != IBMASM_CMD_COMPLETE) 77 times_failed++; 78 79 wait_event_interruptible_timeout(rhb->wait, 80 rhb->stopped, 81 REVERSE_HEARTBEAT_TIMEOUT * HZ); 82 83 if (signal_pending(current) || rhb->stopped) { 84 result = -EINTR; 85 break; 86 } 87 } 88 command_put(cmd); 89 rhb->stopped = 0; 90 91 return result; 92 } 93 94 void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb) 95 { 96 rhb->stopped = 1; 97 wake_up_interruptible(&rhb->wait); 98 } 99