diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/misc/ibmasm/r_heartbeat.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/misc/ibmasm/r_heartbeat.c')
-rw-r--r-- | drivers/misc/ibmasm/r_heartbeat.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/drivers/misc/ibmasm/r_heartbeat.c b/drivers/misc/ibmasm/r_heartbeat.c new file mode 100644 index 000000000000..93d9c1b2ad6f --- /dev/null +++ b/drivers/misc/ibmasm/r_heartbeat.c @@ -0,0 +1,98 @@ + +/* + * 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 "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(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); +} |