forked from Minki/linux
50f67a0671
Propagate error codes from called functions, they are correct. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
387 lines
8.5 KiB
C
387 lines
8.5 KiB
C
/*
|
|
*
|
|
* Intel Management Engine Interface (Intel MEI) Linux driver
|
|
* Copyright (c) 2003-2012, 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 <linux/watchdog.h>
|
|
|
|
#include <linux/mei.h>
|
|
|
|
#include "mei_dev.h"
|
|
#include "hbm.h"
|
|
#include "hw-me.h"
|
|
#include "client.h"
|
|
|
|
static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 };
|
|
static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 };
|
|
|
|
/*
|
|
* AMT Watchdog Device
|
|
*/
|
|
#define INTEL_AMT_WATCHDOG_ID "INTCAMT"
|
|
|
|
/* 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);
|
|
|
|
static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
|
|
{
|
|
dev_dbg(&dev->pdev->dev, "wd: set timeout=%d.\n", timeout);
|
|
memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE);
|
|
memcpy(dev->wd_data + MEI_WD_HDR_SIZE, &timeout, sizeof(u16));
|
|
}
|
|
|
|
/**
|
|
* mei_wd_host_init - connect to the watchdog client
|
|
*
|
|
* @dev: the device structure
|
|
*
|
|
* returns -ENENT if wd client cannot be found
|
|
* -EIO if write has failed
|
|
* 0 on success
|
|
*/
|
|
int mei_wd_host_init(struct mei_device *dev)
|
|
{
|
|
struct mei_cl *cl = &dev->wd_cl;
|
|
int id;
|
|
int ret;
|
|
|
|
mei_cl_init(cl, dev);
|
|
|
|
dev->wd_timeout = MEI_WD_DEFAULT_TIMEOUT;
|
|
dev->wd_state = MEI_WD_IDLE;
|
|
|
|
|
|
/* check for valid client id */
|
|
id = mei_me_cl_by_uuid(dev, &mei_wd_guid);
|
|
if (id < 0) {
|
|
dev_info(&dev->pdev->dev, "wd: failed to find the client\n");
|
|
return id;
|
|
}
|
|
|
|
cl->me_client_id = dev->me_clients[id].client_id;
|
|
|
|
ret = mei_cl_link(cl, MEI_WD_HOST_CLIENT_ID);
|
|
|
|
if (ret < 0) {
|
|
dev_info(&dev->pdev->dev, "wd: failed link client\n");
|
|
return ret;
|
|
}
|
|
|
|
cl->state = MEI_FILE_CONNECTING;
|
|
|
|
if (mei_hbm_cl_connect_req(dev, cl)) {
|
|
dev_err(&dev->pdev->dev, "wd: failed to connect to the client\n");
|
|
cl->state = MEI_FILE_DISCONNECTED;
|
|
cl->host_client_id = 0;
|
|
return -EIO;
|
|
}
|
|
cl->timer_count = MEI_CONNECT_TIMEOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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 hdr;
|
|
|
|
hdr.host_addr = dev->wd_cl.host_client_id;
|
|
hdr.me_addr = dev->wd_cl.me_client_id;
|
|
hdr.msg_complete = 1;
|
|
hdr.reserved = 0;
|
|
|
|
if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE))
|
|
hdr.length = MEI_WD_START_MSG_SIZE;
|
|
else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_HDR_SIZE))
|
|
hdr.length = MEI_WD_STOP_MSG_SIZE;
|
|
else
|
|
return -EINVAL;
|
|
|
|
return mei_write_message(dev, &hdr, dev->wd_data);
|
|
}
|
|
|
|
/**
|
|
* mei_wd_stop - sends watchdog stop message to fw.
|
|
*
|
|
* @dev: the device structure
|
|
* @preserve: indicate if to keep the timeout value
|
|
*
|
|
* returns 0 if success,
|
|
* -EIO when message send fails
|
|
* -EINVAL when invalid message is to be sent
|
|
*/
|
|
int mei_wd_stop(struct mei_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
if (dev->wd_cl.state != MEI_FILE_CONNECTED ||
|
|
dev->wd_state != MEI_WD_RUNNING)
|
|
return 0;
|
|
|
|
memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_STOP_MSG_SIZE);
|
|
|
|
dev->wd_state = MEI_WD_STOPPING;
|
|
|
|
ret = mei_cl_flow_ctrl_creds(&dev->wd_cl);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret && dev->hbuf_is_ready) {
|
|
ret = 0;
|
|
dev->hbuf_is_ready = false;
|
|
|
|
if (!mei_wd_send(dev)) {
|
|
ret = mei_cl_flow_ctrl_reduce(&dev->wd_cl);
|
|
if (ret)
|
|
goto out;
|
|
} else {
|
|
dev_err(&dev->pdev->dev, "wd: send stop failed\n");
|
|
}
|
|
|
|
dev->wd_pending = false;
|
|
} else {
|
|
dev->wd_pending = true;
|
|
}
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
|
|
dev->wd_state == MEI_WD_IDLE,
|
|
msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
|
|
mutex_lock(&dev->device_lock);
|
|
if (dev->wd_state == MEI_WD_IDLE) {
|
|
dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
|
|
ret = 0;
|
|
} else {
|
|
if (!ret)
|
|
ret = -ETIMEDOUT;
|
|
dev_warn(&dev->pdev->dev,
|
|
"wd: stop failed to complete ret=%d.\n", ret);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* mei_wd_ops_start - wd start command from the watchdog core.
|
|
*
|
|
* @wd_dev - watchdog device struct
|
|
*
|
|
* returns 0 if success, negative errno code for failure
|
|
*/
|
|
static int mei_wd_ops_start(struct watchdog_device *wd_dev)
|
|
{
|
|
int err = -ENODEV;
|
|
struct mei_device *dev;
|
|
|
|
dev = watchdog_get_drvdata(wd_dev);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (dev->dev_state != MEI_DEV_ENABLED) {
|
|
dev_dbg(&dev->pdev->dev,
|
|
"wd: dev_state != MEI_DEV_ENABLED dev_state = %s\n",
|
|
mei_dev_state_str(dev->dev_state));
|
|
goto end_unlock;
|
|
}
|
|
|
|
if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
|
|
dev_dbg(&dev->pdev->dev,
|
|
"MEI Driver is not connected to Watchdog Client\n");
|
|
goto end_unlock;
|
|
}
|
|
|
|
mei_wd_set_start_timeout(dev, dev->wd_timeout);
|
|
|
|
err = 0;
|
|
end_unlock:
|
|
mutex_unlock(&dev->device_lock);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* mei_wd_ops_stop - wd stop command from the watchdog core.
|
|
*
|
|
* @wd_dev - watchdog device struct
|
|
*
|
|
* returns 0 if success, negative errno code for failure
|
|
*/
|
|
static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
|
|
{
|
|
struct mei_device *dev;
|
|
|
|
dev = watchdog_get_drvdata(wd_dev);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
mei_wd_stop(dev);
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* mei_wd_ops_ping - wd ping command from the watchdog core.
|
|
*
|
|
* @wd_dev - watchdog device struct
|
|
*
|
|
* returns 0 if success, negative errno code for failure
|
|
*/
|
|
static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
|
|
{
|
|
int ret = 0;
|
|
struct mei_device *dev;
|
|
|
|
dev = watchdog_get_drvdata(wd_dev);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
|
|
dev_err(&dev->pdev->dev, "wd: not connected.\n");
|
|
ret = -ENODEV;
|
|
goto end;
|
|
}
|
|
|
|
dev->wd_state = MEI_WD_RUNNING;
|
|
|
|
/* Check if we can send the ping to HW*/
|
|
if (dev->hbuf_is_ready && mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
|
|
|
|
dev->hbuf_is_ready = false;
|
|
dev_dbg(&dev->pdev->dev, "wd: sending ping\n");
|
|
|
|
if (mei_wd_send(dev)) {
|
|
dev_err(&dev->pdev->dev, "wd: send failed.\n");
|
|
ret = -EIO;
|
|
goto end;
|
|
}
|
|
|
|
if (mei_cl_flow_ctrl_reduce(&dev->wd_cl)) {
|
|
dev_err(&dev->pdev->dev,
|
|
"wd: mei_cl_flow_ctrl_reduce() failed.\n");
|
|
ret = -EIO;
|
|
goto end;
|
|
}
|
|
|
|
} else {
|
|
dev->wd_pending = true;
|
|
}
|
|
|
|
end:
|
|
mutex_unlock(&dev->device_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
|
|
*
|
|
* @wd_dev - watchdog device struct
|
|
* @timeout - timeout value to set
|
|
*
|
|
* returns 0 if success, negative errno code for failure
|
|
*/
|
|
static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev,
|
|
unsigned int timeout)
|
|
{
|
|
struct mei_device *dev;
|
|
|
|
dev = watchdog_get_drvdata(wd_dev);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
/* Check Timeout value */
|
|
if (timeout < MEI_WD_MIN_TIMEOUT || timeout > MEI_WD_MAX_TIMEOUT)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
dev->wd_timeout = timeout;
|
|
wd_dev->timeout = timeout;
|
|
mei_wd_set_start_timeout(dev, dev->wd_timeout);
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Watchdog Device structs
|
|
*/
|
|
static const struct watchdog_ops wd_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = mei_wd_ops_start,
|
|
.stop = mei_wd_ops_stop,
|
|
.ping = mei_wd_ops_ping,
|
|
.set_timeout = mei_wd_ops_set_timeout,
|
|
};
|
|
static const struct watchdog_info wd_info = {
|
|
.identity = INTEL_AMT_WATCHDOG_ID,
|
|
.options = WDIOF_KEEPALIVEPING |
|
|
WDIOF_SETTIMEOUT |
|
|
WDIOF_ALARMONLY,
|
|
};
|
|
|
|
static struct watchdog_device amt_wd_dev = {
|
|
.info = &wd_info,
|
|
.ops = &wd_ops,
|
|
.timeout = MEI_WD_DEFAULT_TIMEOUT,
|
|
.min_timeout = MEI_WD_MIN_TIMEOUT,
|
|
.max_timeout = MEI_WD_MAX_TIMEOUT,
|
|
};
|
|
|
|
|
|
void mei_watchdog_register(struct mei_device *dev)
|
|
{
|
|
if (watchdog_register_device(&amt_wd_dev)) {
|
|
dev_err(&dev->pdev->dev,
|
|
"wd: unable to register watchdog device.\n");
|
|
return;
|
|
}
|
|
|
|
dev_dbg(&dev->pdev->dev,
|
|
"wd: successfully register watchdog interface.\n");
|
|
watchdog_set_drvdata(&amt_wd_dev, dev);
|
|
}
|
|
|
|
void mei_watchdog_unregister(struct mei_device *dev)
|
|
{
|
|
if (watchdog_get_drvdata(&amt_wd_dev) == NULL)
|
|
return;
|
|
|
|
watchdog_set_drvdata(&amt_wd_dev, NULL);
|
|
watchdog_unregister_device(&amt_wd_dev);
|
|
}
|
|
|