381 lines
8.6 KiB
C
381 lines
8.6 KiB
C
/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2003-2012, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <linux/watchdog.h>
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#include <linux/mei.h>
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#include "mei_dev.h"
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#include "hbm.h"
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#include "hw-me.h"
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#include "client.h"
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static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 };
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static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 };
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const u8 mei_wd_state_independence_msg[3][4] = {
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{0x05, 0x02, 0x51, 0x10},
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{0x05, 0x02, 0x52, 0x10},
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{0x07, 0x02, 0x01, 0x10}
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};
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/*
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* AMT Watchdog Device
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*/
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#define INTEL_AMT_WATCHDOG_ID "INTCAMT"
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/* UUIDs for AMT F/W clients */
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const uuid_le mei_wd_guid = UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, 0x89,
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0x9D, 0xA9, 0x15, 0x14, 0xCB,
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0x32, 0xAB);
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static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
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{
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dev_dbg(&dev->pdev->dev, "wd: set timeout=%d.\n", timeout);
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memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE);
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memcpy(dev->wd_data + MEI_WD_HDR_SIZE, &timeout, sizeof(u16));
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}
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/**
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* mei_wd_host_init - connect to the watchdog client
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*
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* @dev: the device structure
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* returns -ENENT if wd client cannot be found
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* -EIO if write has failed
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* 0 on success
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*/
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int mei_wd_host_init(struct mei_device *dev)
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{
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int id;
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mei_cl_init(&dev->wd_cl, dev);
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/* look for WD client and connect to it */
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dev->wd_cl.state = MEI_FILE_DISCONNECTED;
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dev->wd_timeout = MEI_WD_DEFAULT_TIMEOUT;
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dev->wd_state = MEI_WD_IDLE;
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/* Connect WD ME client to the host client */
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id = mei_cl_link_me(&dev->wd_cl,
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&mei_wd_guid, MEI_WD_HOST_CLIENT_ID);
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if (id < 0) {
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dev_info(&dev->pdev->dev, "wd: failed to find the client\n");
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return -ENOENT;
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}
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if (mei_hbm_cl_connect_req(dev, &dev->wd_cl)) {
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dev_err(&dev->pdev->dev, "wd: failed to connect to the client\n");
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dev->wd_cl.state = MEI_FILE_DISCONNECTED;
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dev->wd_cl.host_client_id = 0;
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return -EIO;
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}
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dev->wd_cl.timer_count = MEI_CONNECT_TIMEOUT;
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return 0;
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}
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/**
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* mei_wd_send - sends watch dog message to fw.
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*
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* @dev: the device structure
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*
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* returns 0 if success,
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* -EIO when message send fails
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* -EINVAL when invalid message is to be sent
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*/
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int mei_wd_send(struct mei_device *dev)
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{
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struct mei_msg_hdr hdr;
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hdr.host_addr = dev->wd_cl.host_client_id;
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hdr.me_addr = dev->wd_cl.me_client_id;
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hdr.msg_complete = 1;
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hdr.reserved = 0;
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if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE))
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hdr.length = MEI_WD_START_MSG_SIZE;
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else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_HDR_SIZE))
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hdr.length = MEI_WD_STOP_MSG_SIZE;
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else
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return -EINVAL;
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return mei_write_message(dev, &hdr, dev->wd_data);
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}
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/**
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* mei_wd_stop - sends watchdog stop message to fw.
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*
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* @dev: the device structure
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* @preserve: indicate if to keep the timeout value
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*
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* returns 0 if success,
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* -EIO when message send fails
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* -EINVAL when invalid message is to be sent
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*/
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int mei_wd_stop(struct mei_device *dev)
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{
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int ret;
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if (dev->wd_cl.state != MEI_FILE_CONNECTED ||
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dev->wd_state != MEI_WD_RUNNING)
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return 0;
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memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_STOP_MSG_SIZE);
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dev->wd_state = MEI_WD_STOPPING;
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ret = mei_cl_flow_ctrl_creds(&dev->wd_cl);
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if (ret < 0)
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goto out;
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if (ret && dev->mei_host_buffer_is_empty) {
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ret = 0;
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dev->mei_host_buffer_is_empty = false;
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if (!mei_wd_send(dev)) {
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ret = mei_cl_flow_ctrl_reduce(&dev->wd_cl);
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if (ret)
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goto out;
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} else {
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dev_err(&dev->pdev->dev, "wd: send stop failed\n");
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}
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dev->wd_pending = false;
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} else {
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dev->wd_pending = true;
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}
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mutex_unlock(&dev->device_lock);
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ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
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dev->wd_state == MEI_WD_IDLE,
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msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
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mutex_lock(&dev->device_lock);
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if (dev->wd_state == MEI_WD_IDLE) {
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dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
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ret = 0;
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} else {
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if (!ret)
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ret = -ETIMEDOUT;
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dev_warn(&dev->pdev->dev,
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"wd: stop failed to complete ret=%d.\n", ret);
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}
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out:
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return ret;
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}
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/*
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* mei_wd_ops_start - wd start command from the watchdog core.
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*
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* @wd_dev - watchdog device struct
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*
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* returns 0 if success, negative errno code for failure
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*/
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static int mei_wd_ops_start(struct watchdog_device *wd_dev)
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{
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int err = -ENODEV;
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struct mei_device *dev;
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dev = watchdog_get_drvdata(wd_dev);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->device_lock);
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if (dev->dev_state != MEI_DEV_ENABLED) {
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dev_dbg(&dev->pdev->dev,
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"wd: dev_state != MEI_DEV_ENABLED dev_state = %s\n",
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mei_dev_state_str(dev->dev_state));
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goto end_unlock;
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}
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if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
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dev_dbg(&dev->pdev->dev,
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"MEI Driver is not connected to Watchdog Client\n");
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goto end_unlock;
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}
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mei_wd_set_start_timeout(dev, dev->wd_timeout);
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err = 0;
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end_unlock:
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mutex_unlock(&dev->device_lock);
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return err;
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}
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/*
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* mei_wd_ops_stop - wd stop command from the watchdog core.
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*
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* @wd_dev - watchdog device struct
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*
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* returns 0 if success, negative errno code for failure
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*/
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static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
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{
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struct mei_device *dev;
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dev = watchdog_get_drvdata(wd_dev);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->device_lock);
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mei_wd_stop(dev);
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mutex_unlock(&dev->device_lock);
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return 0;
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}
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/*
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* mei_wd_ops_ping - wd ping command from the watchdog core.
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*
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* @wd_dev - watchdog device struct
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*
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* returns 0 if success, negative errno code for failure
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*/
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static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
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{
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int ret = 0;
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struct mei_device *dev;
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dev = watchdog_get_drvdata(wd_dev);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->device_lock);
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if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
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dev_err(&dev->pdev->dev, "wd: not connected.\n");
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ret = -ENODEV;
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goto end;
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}
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dev->wd_state = MEI_WD_RUNNING;
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/* Check if we can send the ping to HW*/
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if (dev->mei_host_buffer_is_empty &&
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mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
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dev->mei_host_buffer_is_empty = false;
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dev_dbg(&dev->pdev->dev, "wd: sending ping\n");
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if (mei_wd_send(dev)) {
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dev_err(&dev->pdev->dev, "wd: send failed.\n");
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ret = -EIO;
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goto end;
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}
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if (mei_cl_flow_ctrl_reduce(&dev->wd_cl)) {
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dev_err(&dev->pdev->dev,
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"wd: mei_cl_flow_ctrl_reduce() failed.\n");
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ret = -EIO;
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goto end;
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}
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} else {
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dev->wd_pending = true;
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}
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end:
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mutex_unlock(&dev->device_lock);
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return ret;
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}
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/*
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* mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
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*
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* @wd_dev - watchdog device struct
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* @timeout - timeout value to set
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*
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* returns 0 if success, negative errno code for failure
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*/
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static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev, unsigned int timeout)
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{
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struct mei_device *dev;
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dev = watchdog_get_drvdata(wd_dev);
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if (!dev)
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return -ENODEV;
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/* Check Timeout value */
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if (timeout < MEI_WD_MIN_TIMEOUT || timeout > MEI_WD_MAX_TIMEOUT)
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return -EINVAL;
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mutex_lock(&dev->device_lock);
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dev->wd_timeout = timeout;
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wd_dev->timeout = timeout;
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mei_wd_set_start_timeout(dev, dev->wd_timeout);
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mutex_unlock(&dev->device_lock);
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return 0;
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}
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/*
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* Watchdog Device structs
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*/
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static const struct watchdog_ops wd_ops = {
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.owner = THIS_MODULE,
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.start = mei_wd_ops_start,
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.stop = mei_wd_ops_stop,
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.ping = mei_wd_ops_ping,
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.set_timeout = mei_wd_ops_set_timeout,
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};
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static const struct watchdog_info wd_info = {
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.identity = INTEL_AMT_WATCHDOG_ID,
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.options = WDIOF_KEEPALIVEPING |
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WDIOF_SETTIMEOUT |
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WDIOF_ALARMONLY,
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};
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static struct watchdog_device amt_wd_dev = {
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.info = &wd_info,
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.ops = &wd_ops,
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.timeout = MEI_WD_DEFAULT_TIMEOUT,
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.min_timeout = MEI_WD_MIN_TIMEOUT,
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.max_timeout = MEI_WD_MAX_TIMEOUT,
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};
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void mei_watchdog_register(struct mei_device *dev)
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{
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if (watchdog_register_device(&amt_wd_dev)) {
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dev_err(&dev->pdev->dev,
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"wd: unable to register watchdog device.\n");
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return;
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}
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dev_dbg(&dev->pdev->dev,
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"wd: successfully register watchdog interface.\n");
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watchdog_set_drvdata(&amt_wd_dev, dev);
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}
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void mei_watchdog_unregister(struct mei_device *dev)
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{
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if (watchdog_get_drvdata(&amt_wd_dev) == NULL)
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return;
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watchdog_set_drvdata(&amt_wd_dev, NULL);
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watchdog_unregister_device(&amt_wd_dev);
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}
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