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/*
*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2003-2011, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include "mei_dev.h"
#include "hw.h"
#include "interface.h"
#include "mei.h"
/*
* MEI Watchdog Module Parameters
*/
static u16 watchdog_timeout = AMT_WD_VALUE;
module_param(watchdog_timeout, ushort, 0);
MODULE_PARM_DESC(watchdog_timeout,
"Intel(R) AMT Watchdog timeout value in seconds. (default="
__MODULE_STRING(AMT_WD_VALUE)
", disable=0)");
static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 };
static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 };
const u8 mei_wd_state_independence_msg[3][4] = {
{0x05, 0x02, 0x51, 0x10},
{0x05, 0x02, 0x52, 0x10},
{0x07, 0x02, 0x01, 0x10}
};
/* UUIDs for AMT F/W clients */
const uuid_le mei_wd_guid = UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, 0x89,
0x9D, 0xA9, 0x15, 0x14, 0xCB,
0x32, 0xAB);
void mei_wd_start_setup(struct mei_device *dev)
{
dev_dbg(&dev->pdev->dev, "dev->wd_timeout=%d.\n", dev->wd_timeout);
memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE);
memcpy(dev->wd_data + MEI_WD_PARAMS_SIZE,
&dev->wd_timeout, sizeof(u16));
}
/**
* host_init_wd - mei initialization wd.
*
* @dev: the device structure
*/
void mei_wd_host_init(struct mei_device *dev)
{
mei_cl_init(&dev->wd_cl, dev);
/* look for WD client and connect to it */
dev->wd_cl.state = MEI_FILE_DISCONNECTED;
dev->wd_timeout = watchdog_timeout;
if (dev->wd_timeout > 0) {
mei_wd_start_setup(dev);
/* find ME WD client */
mei_find_me_client_update_filext(dev, &dev->wd_cl,
&mei_wd_guid, MEI_WD_HOST_CLIENT_ID);
dev_dbg(&dev->pdev->dev, "check wd_cl\n");
if (MEI_FILE_CONNECTING == dev->wd_cl.state) {
if (!mei_connect(dev, &dev->wd_cl)) {
dev_dbg(&dev->pdev->dev, "Failed to connect to WD client\n");
dev->wd_cl.state = MEI_FILE_DISCONNECTED;
dev->wd_cl.host_client_id = 0;
mei_host_init_iamthif(dev) ;
} else {
dev->wd_cl.timer_count = CONNECT_TIMEOUT;
}
} else {
dev_dbg(&dev->pdev->dev, "Failed to find WD client\n");
mei_host_init_iamthif(dev) ;
}
} else {
dev->wd_bypass = true;
dev_dbg(&dev->pdev->dev, "WD requested to be disabled\n");
mei_host_init_iamthif(dev) ;
}
}
/**
* mei_wd_send - sends watch dog message to fw.
*
* @dev: the device structure
*
* returns 0 if success,
* -EIO when message send fails
* -EINVAL when invalid message is to be sent
*/
int mei_wd_send(struct mei_device *dev)
{
struct mei_msg_hdr *mei_hdr;
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = dev->wd_cl.host_client_id;
mei_hdr->me_addr = dev->wd_cl.me_client_id;
mei_hdr->msg_complete = 1;
mei_hdr->reserved = 0;
if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE))
mei_hdr->length = MEI_START_WD_DATA_SIZE;
else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE))
mei_hdr->length = MEI_WD_PARAMS_SIZE;
else
return -EINVAL;
if (mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length))
return 0;
return -EIO;
}
int mei_wd_stop(struct mei_device *dev, bool preserve)
{
int ret;
u16 wd_timeout = dev->wd_timeout;
cancel_delayed_work(&dev->wd_work);
if (dev->wd_cl.state != MEI_FILE_CONNECTED || !dev->wd_timeout)
return 0;
dev->wd_timeout = 0;
dev->wd_due_counter = 0;
memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE);
dev->stop = true;
ret = mei_flow_ctrl_creds(dev, &dev->wd_cl);
if (ret < 0)
goto out;
if (ret && dev->mei_host_buffer_is_empty) {
ret = 0;
dev->mei_host_buffer_is_empty = false;
if (!mei_wd_send(dev)) {
ret = mei_flow_ctrl_reduce(dev, &dev->wd_cl);
if (ret)
goto out;
} else {
dev_dbg(&dev->pdev->dev, "send stop WD failed\n");
}
dev->wd_pending = false;
} else {
dev->wd_pending = true;
}
dev->wd_stopped = false;
mutex_unlock(&dev->device_lock);
ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
dev->wd_stopped, 10 * HZ);
mutex_lock(&dev->device_lock);
if (dev->wd_stopped) {
dev_dbg(&dev->pdev->dev, "stop wd complete ret=%d.\n", ret);
ret = 0;
} else {
if (!ret)
ret = -ETIMEDOUT;
dev_warn(&dev->pdev->dev,
"stop wd failed to complete ret=%d.\n", ret);
}
if (preserve)
dev->wd_timeout = wd_timeout;
out:
return ret;
}
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