| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 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 Asböck <amax@us.ibm.com> |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <linux/sched.h> |
| 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 = { |
| 40 | .type = sp_read, |
| 41 | .command_size = 3, |
| 42 | .data_size = 0, |
| 43 | .status = 0 |
| 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 | |
| 67 | cmd = ibmasm_new_command(sp, sizeof rhb_dot_cmd); |
| 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 | |
| 80 | wait_event_interruptible_timeout(rhb->wait, |
| 81 | rhb->stopped, |
| 82 | REVERSE_HEARTBEAT_TIMEOUT * HZ); |
| 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 | } |