1da177e4c3
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!
176 lines
4.3 KiB
C
176 lines
4.3 KiB
C
|
|
/*
|
|
* IBM ASM Service Processor Device Driver
|
|
*
|
|
* 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"
|
|
|
|
static void exec_next_command(struct service_processor *sp);
|
|
static void free_command(struct kobject *kobj);
|
|
|
|
static struct kobj_type ibmasm_cmd_kobj_type = {
|
|
.release = free_command,
|
|
};
|
|
|
|
|
|
struct command *ibmasm_new_command(size_t buffer_size)
|
|
{
|
|
struct command *cmd;
|
|
|
|
if (buffer_size > IBMASM_CMD_MAX_BUFFER_SIZE)
|
|
return NULL;
|
|
|
|
cmd = kmalloc(sizeof(struct command), GFP_KERNEL);
|
|
if (cmd == NULL)
|
|
return NULL;
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
|
|
cmd->buffer = kmalloc(buffer_size, GFP_KERNEL);
|
|
if (cmd->buffer == NULL) {
|
|
kfree(cmd);
|
|
return NULL;
|
|
}
|
|
memset(cmd->buffer, 0, buffer_size);
|
|
cmd->buffer_size = buffer_size;
|
|
|
|
kobject_init(&cmd->kobj);
|
|
cmd->kobj.ktype = &ibmasm_cmd_kobj_type;
|
|
|
|
cmd->status = IBMASM_CMD_PENDING;
|
|
init_waitqueue_head(&cmd->wait);
|
|
INIT_LIST_HEAD(&cmd->queue_node);
|
|
|
|
return cmd;
|
|
}
|
|
|
|
static void free_command(struct kobject *kobj)
|
|
{
|
|
struct command *cmd = to_command(kobj);
|
|
|
|
list_del(&cmd->queue_node);
|
|
kfree(cmd->buffer);
|
|
kfree(cmd);
|
|
}
|
|
|
|
static void enqueue_command(struct service_processor *sp, struct command *cmd)
|
|
{
|
|
list_add_tail(&cmd->queue_node, &sp->command_queue);
|
|
}
|
|
|
|
static struct command *dequeue_command(struct service_processor *sp)
|
|
{
|
|
struct command *cmd;
|
|
struct list_head *next;
|
|
|
|
if (list_empty(&sp->command_queue))
|
|
return NULL;
|
|
|
|
next = sp->command_queue.next;
|
|
list_del_init(next);
|
|
cmd = list_entry(next, struct command, queue_node);
|
|
|
|
return cmd;
|
|
}
|
|
|
|
static inline void do_exec_command(struct service_processor *sp)
|
|
{
|
|
if (ibmasm_send_i2o_message(sp)) {
|
|
sp->current_command->status = IBMASM_CMD_FAILED;
|
|
exec_next_command(sp);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* exec_command
|
|
* send a command to a service processor
|
|
* Commands are executed sequentially. One command (sp->current_command)
|
|
* is sent to the service processor. Once the interrupt handler gets a
|
|
* message of type command_response, the message is copied into
|
|
* the current commands buffer,
|
|
*/
|
|
void ibmasm_exec_command(struct service_processor *sp, struct command *cmd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&sp->lock, flags);
|
|
|
|
if (!sp->current_command) {
|
|
command_get(cmd);
|
|
sp->current_command = cmd;
|
|
spin_unlock_irqrestore(&sp->lock, flags);
|
|
|
|
do_exec_command(sp);
|
|
} else {
|
|
enqueue_command(sp, cmd);
|
|
spin_unlock_irqrestore(&sp->lock, flags);
|
|
}
|
|
}
|
|
|
|
static void exec_next_command(struct service_processor *sp)
|
|
{
|
|
unsigned long flags;
|
|
|
|
wake_up(&sp->current_command->wait);
|
|
command_put(sp->current_command);
|
|
|
|
spin_lock_irqsave(&sp->lock, flags);
|
|
sp->current_command = dequeue_command(sp);
|
|
if (sp->current_command) {
|
|
command_get(sp->current_command);
|
|
spin_unlock_irqrestore(&sp->lock, flags);
|
|
do_exec_command(sp);
|
|
} else {
|
|
spin_unlock_irqrestore(&sp->lock, flags);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sleep until a command has failed or a response has been received
|
|
* and the command status been updated by the interrupt handler.
|
|
* (see receive_response).
|
|
*/
|
|
void ibmasm_wait_for_response(struct command *cmd, int timeout)
|
|
{
|
|
wait_event_interruptible_timeout(cmd->wait,
|
|
cmd->status == IBMASM_CMD_COMPLETE ||
|
|
cmd->status == IBMASM_CMD_FAILED,
|
|
timeout * HZ);
|
|
}
|
|
|
|
/**
|
|
* receive_command_response
|
|
* called by the interrupt handler when a dot command of type command_response
|
|
* was received.
|
|
*/
|
|
void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size)
|
|
{
|
|
struct command *cmd = sp->current_command;
|
|
|
|
if (!sp->current_command)
|
|
return;
|
|
|
|
memcpy(cmd->buffer, response, min(size, cmd->buffer_size));
|
|
cmd->status = IBMASM_CMD_COMPLETE;
|
|
exec_next_command(sp);
|
|
}
|