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!
175 lines
4.3 KiB
C
175 lines
4.3 KiB
C
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/*
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* IBM ASM Service Processor Device Driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2004
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*
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* Author: Max Asböck <amax@us.ibm.com>
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*
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*/
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#include "ibmasm.h"
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static void exec_next_command(struct service_processor *sp);
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static void free_command(struct kobject *kobj);
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static struct kobj_type ibmasm_cmd_kobj_type = {
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.release = free_command,
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};
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struct command *ibmasm_new_command(size_t buffer_size)
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{
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struct command *cmd;
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if (buffer_size > IBMASM_CMD_MAX_BUFFER_SIZE)
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return NULL;
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cmd = kmalloc(sizeof(struct command), GFP_KERNEL);
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if (cmd == NULL)
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return NULL;
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memset(cmd, 0, sizeof(*cmd));
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cmd->buffer = kmalloc(buffer_size, GFP_KERNEL);
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if (cmd->buffer == NULL) {
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kfree(cmd);
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return NULL;
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}
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memset(cmd->buffer, 0, buffer_size);
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cmd->buffer_size = buffer_size;
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kobject_init(&cmd->kobj);
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cmd->kobj.ktype = &ibmasm_cmd_kobj_type;
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cmd->status = IBMASM_CMD_PENDING;
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init_waitqueue_head(&cmd->wait);
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INIT_LIST_HEAD(&cmd->queue_node);
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return cmd;
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}
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static void free_command(struct kobject *kobj)
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{
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struct command *cmd = to_command(kobj);
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list_del(&cmd->queue_node);
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kfree(cmd->buffer);
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kfree(cmd);
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}
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static void enqueue_command(struct service_processor *sp, struct command *cmd)
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{
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list_add_tail(&cmd->queue_node, &sp->command_queue);
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}
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static struct command *dequeue_command(struct service_processor *sp)
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{
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struct command *cmd;
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struct list_head *next;
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if (list_empty(&sp->command_queue))
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return NULL;
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next = sp->command_queue.next;
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list_del_init(next);
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cmd = list_entry(next, struct command, queue_node);
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return cmd;
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}
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static inline void do_exec_command(struct service_processor *sp)
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{
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if (ibmasm_send_i2o_message(sp)) {
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sp->current_command->status = IBMASM_CMD_FAILED;
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exec_next_command(sp);
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}
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}
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/**
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* exec_command
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* send a command to a service processor
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* Commands are executed sequentially. One command (sp->current_command)
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* is sent to the service processor. Once the interrupt handler gets a
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* message of type command_response, the message is copied into
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* the current commands buffer,
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*/
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void ibmasm_exec_command(struct service_processor *sp, struct command *cmd)
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{
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unsigned long flags;
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spin_lock_irqsave(&sp->lock, flags);
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if (!sp->current_command) {
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command_get(cmd);
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sp->current_command = cmd;
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spin_unlock_irqrestore(&sp->lock, flags);
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do_exec_command(sp);
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} else {
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enqueue_command(sp, cmd);
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spin_unlock_irqrestore(&sp->lock, flags);
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}
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}
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static void exec_next_command(struct service_processor *sp)
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{
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unsigned long flags;
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wake_up(&sp->current_command->wait);
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command_put(sp->current_command);
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spin_lock_irqsave(&sp->lock, flags);
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sp->current_command = dequeue_command(sp);
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if (sp->current_command) {
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command_get(sp->current_command);
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spin_unlock_irqrestore(&sp->lock, flags);
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do_exec_command(sp);
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} else {
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spin_unlock_irqrestore(&sp->lock, flags);
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}
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}
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/**
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* Sleep until a command has failed or a response has been received
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* and the command status been updated by the interrupt handler.
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* (see receive_response).
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*/
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void ibmasm_wait_for_response(struct command *cmd, int timeout)
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{
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wait_event_interruptible_timeout(cmd->wait,
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cmd->status == IBMASM_CMD_COMPLETE ||
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cmd->status == IBMASM_CMD_FAILED,
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timeout * HZ);
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}
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/**
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* receive_command_response
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* called by the interrupt handler when a dot command of type command_response
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* was received.
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*/
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void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size)
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{
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struct command *cmd = sp->current_command;
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if (!sp->current_command)
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return;
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memcpy(cmd->buffer, response, min(size, cmd->buffer_size));
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cmd->status = IBMASM_CMD_COMPLETE;
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exec_next_command(sp);
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}
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