8818760512
This patch fixes a race in the command reference counting logic by putting spinlocks around kobject_put() in the command_put function. - Also added debug messages. - Changed a memcpy to memcpy_fromio since we are reading from io space. Signed-off-by: Max Asbock <masbock@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
153 lines
4.0 KiB
C
153 lines
4.0 KiB
C
/*
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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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#include "dot_command.h"
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/**
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* Dispatch an incoming message to the specific handler for the message.
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* Called from interrupt context.
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*/
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void ibmasm_receive_message(struct service_processor *sp, void *message, int message_size)
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{
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u32 size;
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struct dot_command_header *header = (struct dot_command_header *)message;
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if (message_size == 0)
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return;
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size = get_dot_command_size(message);
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if (size == 0)
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return;
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if (size > message_size)
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size = message_size;
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switch (header->type) {
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case sp_event:
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ibmasm_receive_event(sp, message, size);
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break;
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case sp_command_response:
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ibmasm_receive_command_response(sp, message, size);
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break;
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case sp_heartbeat:
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ibmasm_receive_heartbeat(sp, message, size);
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break;
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default:
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dev_err(sp->dev, "Received unknown message from service processor\n");
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}
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}
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#define INIT_BUFFER_SIZE 32
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/**
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* send the 4.3.5.10 dot command (driver VPD) to the service processor
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*/
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int ibmasm_send_driver_vpd(struct service_processor *sp)
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{
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struct command *command;
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struct dot_command_header *header;
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u8 *vpd_command;
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u8 *vpd_data;
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int result = 0;
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command = ibmasm_new_command(sp, INIT_BUFFER_SIZE);
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if (command == NULL)
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return -ENOMEM;
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header = (struct dot_command_header *)command->buffer;
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header->type = sp_write;
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header->command_size = 4;
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header->data_size = 16;
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header->status = 0;
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header->reserved = 0;
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vpd_command = command->buffer + sizeof(struct dot_command_header);
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vpd_command[0] = 0x4;
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vpd_command[1] = 0x3;
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vpd_command[2] = 0x5;
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vpd_command[3] = 0xa;
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vpd_data = vpd_command + header->command_size;
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vpd_data[0] = 0;
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strcat(vpd_data, IBMASM_DRIVER_VPD);
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vpd_data[10] = 0;
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vpd_data[15] = 0;
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ibmasm_exec_command(sp, command);
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ibmasm_wait_for_response(command, IBMASM_CMD_TIMEOUT_NORMAL);
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if (command->status != IBMASM_CMD_COMPLETE)
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result = -ENODEV;
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command_put(command);
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return result;
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}
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struct os_state_command {
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struct dot_command_header header;
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unsigned char command[3];
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unsigned char data;
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};
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/**
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* send the 4.3.6 dot command (os state) to the service processor
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* During driver init this function is called with os state "up".
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* This causes the service processor to start sending heartbeats the
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* driver.
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* During driver exit the function is called with os state "down",
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* causing the service processor to stop the heartbeats.
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*/
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int ibmasm_send_os_state(struct service_processor *sp, int os_state)
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{
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struct command *cmd;
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struct os_state_command *os_state_cmd;
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int result = 0;
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cmd = ibmasm_new_command(sp, sizeof(struct os_state_command));
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if (cmd == NULL)
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return -ENOMEM;
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os_state_cmd = (struct os_state_command *)cmd->buffer;
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os_state_cmd->header.type = sp_write;
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os_state_cmd->header.command_size = 3;
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os_state_cmd->header.data_size = 1;
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os_state_cmd->header.status = 0;
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os_state_cmd->command[0] = 4;
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os_state_cmd->command[1] = 3;
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os_state_cmd->command[2] = 6;
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os_state_cmd->data = os_state;
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ibmasm_exec_command(sp, cmd);
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ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);
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if (cmd->status != IBMASM_CMD_COMPLETE)
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result = -ENODEV;
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command_put(cmd);
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return result;
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}
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