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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | |
3 | /* | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) IBM Corporation, 2004 | |
6 | * | |
d36b6910 | 7 | * Author: Max Asböck <amax@us.ibm.com> |
1da177e4 LT |
8 | */ |
9 | ||
174cd4b1 | 10 | #include <linux/sched/signal.h> |
1da177e4 LT |
11 | #include "ibmasm.h" |
12 | #include "dot_command.h" | |
13 | ||
14 | /* | |
15 | * Reverse Heartbeat, i.e. heartbeats sent from the driver to the | |
16 | * service processor. | |
17 | * These heartbeats are initiated by user level programs. | |
18 | */ | |
19 | ||
20 | /* the reverse heartbeat dot command */ | |
21 | #pragma pack(1) | |
22 | static struct { | |
23 | struct dot_command_header header; | |
24 | unsigned char command[3]; | |
25 | } rhb_dot_cmd = { | |
26 | .header = { | |
3110dc7a | 27 | .type = sp_read, |
1da177e4 LT |
28 | .command_size = 3, |
29 | .data_size = 0, | |
3110dc7a | 30 | .status = 0 |
1da177e4 LT |
31 | }, |
32 | .command = { 4, 3, 6 } | |
33 | }; | |
34 | #pragma pack() | |
35 | ||
36 | void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb) | |
37 | { | |
38 | init_waitqueue_head(&rhb->wait); | |
39 | rhb->stopped = 0; | |
40 | } | |
41 | ||
e0a6ad87 | 42 | /* |
1da177e4 LT |
43 | * start_reverse_heartbeat |
44 | * Loop forever, sending a reverse heartbeat dot command to the service | |
45 | * processor, then sleeping. The loop comes to an end if the service | |
46 | * processor fails to respond 3 times or we were interrupted. | |
47 | */ | |
48 | int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb) | |
49 | { | |
50 | struct command *cmd; | |
51 | int times_failed = 0; | |
52 | int result = 1; | |
53 | ||
88187605 | 54 | cmd = ibmasm_new_command(sp, sizeof rhb_dot_cmd); |
1da177e4 LT |
55 | if (!cmd) |
56 | return -ENOMEM; | |
57 | ||
58 | while (times_failed < 3) { | |
59 | memcpy(cmd->buffer, (void *)&rhb_dot_cmd, sizeof rhb_dot_cmd); | |
60 | cmd->status = IBMASM_CMD_PENDING; | |
61 | ibmasm_exec_command(sp, cmd); | |
62 | ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL); | |
63 | ||
64 | if (cmd->status != IBMASM_CMD_COMPLETE) | |
65 | times_failed++; | |
66 | ||
3110dc7a | 67 | wait_event_interruptible_timeout(rhb->wait, |
1da177e4 | 68 | rhb->stopped, |
3110dc7a | 69 | REVERSE_HEARTBEAT_TIMEOUT * HZ); |
1da177e4 LT |
70 | |
71 | if (signal_pending(current) || rhb->stopped) { | |
72 | result = -EINTR; | |
73 | break; | |
74 | } | |
75 | } | |
76 | command_put(cmd); | |
77 | rhb->stopped = 0; | |
78 | ||
79 | return result; | |
80 | } | |
81 | ||
82 | void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb) | |
83 | { | |
84 | rhb->stopped = 1; | |
85 | wake_up_interruptible(&rhb->wait); | |
86 | } |