2011-05-15 10:43:47 +00:00
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/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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2012-02-09 17:25:53 +00:00
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* Copyright (c) 2003-2012, Intel Corporation.
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2011-05-15 10:43:47 +00:00
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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/sched.h>
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2011-09-07 06:03:09 +00:00
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#include <linux/watchdog.h>
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2011-05-15 10:43:47 +00:00
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2012-12-25 17:06:03 +00:00
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#include <linux/mei.h>
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2011-05-15 10:43:47 +00:00
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#include "mei_dev.h"
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2013-01-08 21:07:12 +00:00
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#include "hbm.h"
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2013-01-08 21:07:14 +00:00
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#include "client.h"
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2011-05-15 10:43:47 +00:00
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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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2011-12-22 16:50:50 +00:00
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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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2011-05-15 10:43:47 +00:00
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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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2012-03-19 15:58:43 +00:00
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static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
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2011-05-15 10:43:47 +00:00
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{
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2014-09-29 13:31:42 +00:00
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dev_dbg(dev->dev, "wd: set timeout=%d.\n", timeout);
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2012-08-16 16:39:42 +00:00
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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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2011-05-15 10:43:47 +00:00
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}
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/**
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2012-07-04 16:24:51 +00:00
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* mei_wd_host_init - connect to the watchdog client
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2011-05-15 10:43:47 +00:00
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*
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* @dev: the device structure
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2015-05-04 06:43:54 +00:00
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* @me_cl: me client
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2013-04-04 16:05:05 +00:00
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*
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2014-09-29 13:31:49 +00:00
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* Return: -ENOTTY if wd client cannot be found
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2012-04-03 20:34:58 +00:00
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* -EIO if write has failed
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2012-07-04 16:24:51 +00:00
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* 0 on success
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2011-05-15 10:43:47 +00:00
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*/
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2015-05-04 06:43:54 +00:00
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int mei_wd_host_init(struct mei_device *dev, struct mei_me_client *me_cl)
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2011-05-15 10:43:47 +00:00
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{
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2013-01-08 21:07:22 +00:00
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struct mei_cl *cl = &dev->wd_cl;
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int ret;
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mei_cl_init(cl, dev);
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2011-05-15 10:43:47 +00:00
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2012-08-16 16:39:42 +00:00
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dev->wd_timeout = MEI_WD_DEFAULT_TIMEOUT;
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2012-08-16 16:39:43 +00:00
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dev->wd_state = MEI_WD_IDLE;
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2011-05-15 10:43:47 +00:00
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2013-01-08 21:07:22 +00:00
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ret = mei_cl_link(cl, MEI_WD_HOST_CLIENT_ID);
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if (ret < 0) {
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2014-09-29 13:31:42 +00:00
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dev_info(dev->dev, "wd: failed link client\n");
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2013-10-21 19:05:39 +00:00
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return ret;
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2013-01-08 21:07:22 +00:00
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}
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2015-05-04 06:43:54 +00:00
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ret = mei_cl_connect(cl, me_cl, NULL);
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2014-02-17 13:13:21 +00:00
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if (ret) {
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2014-09-29 13:31:42 +00:00
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dev_err(dev->dev, "wd: failed to connect = %d\n", ret);
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2014-02-17 13:13:21 +00:00
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mei_cl_unlink(cl);
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return ret;
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2011-05-15 10:43:47 +00:00
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}
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2011-09-07 06:03:07 +00:00
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2014-02-17 13:13:21 +00:00
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ret = mei_watchdog_register(dev);
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if (ret) {
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mei_cl_disconnect(cl);
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mei_cl_unlink(cl);
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}
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return ret;
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2011-05-15 10:43:47 +00:00
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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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2014-09-29 13:31:49 +00:00
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* Return: 0 if success,
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2011-05-15 10:43:47 +00:00
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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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2014-02-19 15:35:50 +00:00
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* -ENODEV on flow control failure
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2011-05-15 10:43:47 +00:00
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*/
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int mei_wd_send(struct mei_device *dev)
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{
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2014-02-19 15:35:50 +00:00
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struct mei_cl *cl = &dev->wd_cl;
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2012-12-25 17:06:10 +00:00
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struct mei_msg_hdr hdr;
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2014-02-19 15:35:50 +00:00
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int ret;
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2011-05-15 10:43:47 +00:00
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2014-02-19 15:35:50 +00:00
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hdr.host_addr = cl->host_client_id;
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2015-05-04 06:43:54 +00:00
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hdr.me_addr = mei_cl_me_id(cl);
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2012-12-25 17:06:10 +00:00
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hdr.msg_complete = 1;
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hdr.reserved = 0;
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2013-12-17 13:56:56 +00:00
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hdr.internal = 0;
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2011-05-15 10:43:47 +00:00
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2012-08-16 16:39:42 +00:00
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if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE))
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2012-12-25 17:06:10 +00:00
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hdr.length = MEI_WD_START_MSG_SIZE;
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2012-08-16 16:39:42 +00:00
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else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_HDR_SIZE))
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2012-12-25 17:06:10 +00:00
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hdr.length = MEI_WD_STOP_MSG_SIZE;
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2014-02-19 15:35:50 +00:00
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else {
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2014-09-29 13:31:42 +00:00
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dev_err(dev->dev, "wd: invalid message is to be sent, aborting\n");
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2011-05-15 10:43:47 +00:00
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return -EINVAL;
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2014-02-19 15:35:50 +00:00
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}
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ret = mei_write_message(dev, &hdr, dev->wd_data);
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if (ret) {
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2014-09-29 13:31:42 +00:00
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dev_err(dev->dev, "wd: write message failed\n");
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2014-02-19 15:35:50 +00:00
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return ret;
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}
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2011-05-15 10:43:47 +00:00
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2014-02-19 15:35:50 +00:00
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ret = mei_cl_flow_ctrl_reduce(cl);
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if (ret) {
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2014-09-29 13:31:42 +00:00
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dev_err(dev->dev, "wd: flow_ctrl_reduce failed.\n");
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2014-02-19 15:35:50 +00:00
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return ret;
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}
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return 0;
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2011-05-15 10:43:47 +00:00
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}
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2011-09-07 06:03:17 +00:00
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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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*
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2014-09-29 13:31:49 +00:00
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* Return: 0 if success
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2014-02-19 15:35:51 +00:00
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* on error:
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* -EIO when message send fails
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2011-09-07 06:03:17 +00:00
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* -EINVAL when invalid message is to be sent
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2014-02-19 15:35:51 +00:00
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* -ETIME on message timeout
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2011-09-07 06:03:17 +00:00
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*/
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2012-08-16 16:39:43 +00:00
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int mei_wd_stop(struct mei_device *dev)
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2011-05-15 10:43:47 +00:00
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{
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2015-03-26 22:27:58 +00:00
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struct mei_cl *cl = &dev->wd_cl;
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2011-05-15 10:43:47 +00:00
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int ret;
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|
2015-03-26 22:27:58 +00:00
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if (!mei_cl_is_connected(cl) ||
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2012-08-16 16:39:43 +00:00
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dev->wd_state != MEI_WD_RUNNING)
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2011-05-15 10:43:47 +00:00
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return 0;
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2012-08-16 16:39:42 +00:00
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memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_STOP_MSG_SIZE);
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2012-08-16 16:39:43 +00:00
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dev->wd_state = MEI_WD_STOPPING;
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2011-05-15 10:43:47 +00:00
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|
2015-03-26 22:27:58 +00:00
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ret = mei_cl_flow_ctrl_creds(cl);
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2011-05-15 10:43:47 +00:00
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if (ret < 0)
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2014-02-19 15:35:51 +00:00
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goto err;
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2011-05-15 10:43:47 +00:00
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|
2014-02-19 15:35:47 +00:00
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if (ret && mei_hbuf_acquire(dev)) {
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2014-02-19 15:35:50 +00:00
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ret = mei_wd_send(dev);
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if (ret)
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2014-02-19 15:35:51 +00:00
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goto err;
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2011-05-25 14:28:22 +00:00
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dev->wd_pending = false;
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2011-05-15 10:43:47 +00:00
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} else {
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2011-05-25 14:28:22 +00:00
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dev->wd_pending = true;
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2011-05-15 10:43:47 +00:00
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}
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2012-08-16 16:39:43 +00:00
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2011-05-15 10:43:47 +00:00
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mutex_unlock(&dev->device_lock);
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2014-02-19 15:35:51 +00:00
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ret = wait_event_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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2011-05-15 10:43:47 +00:00
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mutex_lock(&dev->device_lock);
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2014-02-19 15:35:51 +00:00
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if (dev->wd_state != MEI_WD_IDLE) {
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/* timeout */
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ret = -ETIME;
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2014-09-29 13:31:42 +00:00
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dev_warn(dev->dev, "wd: stop failed to complete ret=%d\n", ret);
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2014-02-19 15:35:51 +00:00
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goto err;
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2011-06-13 13:39:31 +00:00
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}
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2014-09-29 13:31:42 +00:00
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dev_dbg(dev->dev, "wd: stop completed after %u msec\n",
|
2014-02-19 15:35:51 +00:00
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MEI_WD_STOP_TIMEOUT - jiffies_to_msecs(ret));
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return 0;
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err:
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2011-05-15 10:43:47 +00:00
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return ret;
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}
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2015-02-10 08:39:35 +00:00
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/**
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2011-09-07 06:03:10 +00:00
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* mei_wd_ops_start - wd start command from the watchdog core.
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*
|
2015-02-10 08:39:35 +00:00
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* @wd_dev: watchdog device struct
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2011-09-07 06:03:10 +00:00
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*
|
2014-09-29 13:31:49 +00:00
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* Return: 0 if success, negative errno code for failure
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2011-09-07 06:03:10 +00:00
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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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struct mei_device *dev;
|
2015-03-26 22:27:58 +00:00
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struct mei_cl *cl;
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int err = -ENODEV;
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2011-09-07 06:03:10 +00:00
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|
2012-08-16 16:39:44 +00:00
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dev = watchdog_get_drvdata(wd_dev);
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2011-09-07 06:03:10 +00:00
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if (!dev)
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return -ENODEV;
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|
2015-03-26 22:27:58 +00:00
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cl = &dev->wd_cl;
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2011-09-07 06:03:10 +00:00
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mutex_lock(&dev->device_lock);
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|
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|
2012-08-06 21:03:56 +00:00
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if (dev->dev_state != MEI_DEV_ENABLED) {
|
2014-09-29 13:31:42 +00:00
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dev_dbg(dev->dev, "wd: dev_state != MEI_DEV_ENABLED dev_state = %s\n",
|
2012-08-06 21:03:56 +00:00
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mei_dev_state_str(dev->dev_state));
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2011-09-07 06:03:10 +00:00
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goto end_unlock;
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}
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|
2015-03-26 22:27:58 +00:00
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if (!mei_cl_is_connected(cl)) {
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cl_dbg(dev, cl, "MEI Driver is not connected to Watchdog Client\n");
|
2011-09-07 06:03:10 +00:00
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goto end_unlock;
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}
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2011-09-07 06:03:12 +00:00
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mei_wd_set_start_timeout(dev, dev->wd_timeout);
|
2011-09-07 06:03:10 +00:00
|
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err = 0;
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end_unlock:
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|
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mutex_unlock(&dev->device_lock);
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return err;
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|
|
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}
|
|
|
|
|
2015-02-10 08:39:35 +00:00
|
|
|
/**
|
2011-09-07 06:03:10 +00:00
|
|
|
* mei_wd_ops_stop - wd stop command from the watchdog core.
|
|
|
|
*
|
2015-02-10 08:39:35 +00:00
|
|
|
* @wd_dev: watchdog device struct
|
2011-09-07 06:03:10 +00:00
|
|
|
*
|
2014-09-29 13:31:49 +00:00
|
|
|
* Return: 0 if success, negative errno code for failure
|
2011-09-07 06:03:10 +00:00
|
|
|
*/
|
|
|
|
static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
|
|
|
|
{
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|
|
|
struct mei_device *dev;
|
|
|
|
|
2012-08-16 16:39:44 +00:00
|
|
|
dev = watchdog_get_drvdata(wd_dev);
|
2011-09-07 06:03:10 +00:00
|
|
|
if (!dev)
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|
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|
return -ENODEV;
|
|
|
|
|
|
|
|
mutex_lock(&dev->device_lock);
|
2012-08-16 16:39:43 +00:00
|
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|
mei_wd_stop(dev);
|
2011-09-07 06:03:10 +00:00
|
|
|
mutex_unlock(&dev->device_lock);
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|
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return 0;
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|
|
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}
|
|
|
|
|
2015-02-10 08:39:35 +00:00
|
|
|
/**
|
2011-09-07 06:03:11 +00:00
|
|
|
* mei_wd_ops_ping - wd ping command from the watchdog core.
|
|
|
|
*
|
2015-02-10 08:39:35 +00:00
|
|
|
* @wd_dev: watchdog device struct
|
2011-09-07 06:03:11 +00:00
|
|
|
*
|
2014-09-29 13:31:49 +00:00
|
|
|
* Return: 0 if success, negative errno code for failure
|
2011-09-07 06:03:11 +00:00
|
|
|
*/
|
|
|
|
static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
|
|
|
|
{
|
|
|
|
struct mei_device *dev;
|
2014-10-02 10:39:32 +00:00
|
|
|
struct mei_cl *cl;
|
2014-02-19 15:35:47 +00:00
|
|
|
int ret;
|
2011-09-07 06:03:11 +00:00
|
|
|
|
2012-08-16 16:39:44 +00:00
|
|
|
dev = watchdog_get_drvdata(wd_dev);
|
2011-09-07 06:03:11 +00:00
|
|
|
if (!dev)
|
|
|
|
return -ENODEV;
|
|
|
|
|
2014-10-02 10:39:32 +00:00
|
|
|
cl = &dev->wd_cl;
|
|
|
|
|
2011-09-07 06:03:11 +00:00
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
|
2015-03-26 22:27:58 +00:00
|
|
|
if (!mei_cl_is_connected(cl)) {
|
|
|
|
cl_err(dev, cl, "wd: not connected.\n");
|
2011-09-07 06:03:11 +00:00
|
|
|
ret = -ENODEV;
|
|
|
|
goto end;
|
|
|
|
}
|
|
|
|
|
2012-08-16 16:39:43 +00:00
|
|
|
dev->wd_state = MEI_WD_RUNNING;
|
|
|
|
|
2014-10-02 10:39:32 +00:00
|
|
|
ret = mei_cl_flow_ctrl_creds(cl);
|
2014-02-19 15:35:47 +00:00
|
|
|
if (ret < 0)
|
|
|
|
goto end;
|
2014-10-02 10:39:32 +00:00
|
|
|
|
2011-09-07 06:03:11 +00:00
|
|
|
/* Check if we can send the ping to HW*/
|
2014-02-19 15:35:47 +00:00
|
|
|
if (ret && mei_hbuf_acquire(dev)) {
|
2014-09-29 13:31:42 +00:00
|
|
|
dev_dbg(dev->dev, "wd: sending ping\n");
|
2011-09-07 06:03:11 +00:00
|
|
|
|
2014-02-19 15:35:50 +00:00
|
|
|
ret = mei_wd_send(dev);
|
|
|
|
if (ret)
|
2011-09-07 06:03:11 +00:00
|
|
|
goto end;
|
2014-02-19 15:35:50 +00:00
|
|
|
dev->wd_pending = false;
|
2011-09-07 06:03:11 +00:00
|
|
|
} else {
|
|
|
|
dev->wd_pending = true;
|
|
|
|
}
|
|
|
|
|
|
|
|
end:
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2015-02-10 08:39:35 +00:00
|
|
|
/**
|
2011-09-07 06:03:12 +00:00
|
|
|
* mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
|
|
|
|
*
|
2015-02-10 08:39:35 +00:00
|
|
|
* @wd_dev: watchdog device struct
|
|
|
|
* @timeout: timeout value to set
|
2011-09-07 06:03:12 +00:00
|
|
|
*
|
2014-09-29 13:31:49 +00:00
|
|
|
* Return: 0 if success, negative errno code for failure
|
2011-09-07 06:03:12 +00:00
|
|
|
*/
|
2013-04-13 20:41:25 +00:00
|
|
|
static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev,
|
|
|
|
unsigned int timeout)
|
2011-09-07 06:03:12 +00:00
|
|
|
{
|
|
|
|
struct mei_device *dev;
|
|
|
|
|
2012-08-16 16:39:44 +00:00
|
|
|
dev = watchdog_get_drvdata(wd_dev);
|
2011-09-07 06:03:12 +00:00
|
|
|
if (!dev)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
/* Check Timeout value */
|
2012-08-16 16:39:42 +00:00
|
|
|
if (timeout < MEI_WD_MIN_TIMEOUT || timeout > MEI_WD_MAX_TIMEOUT)
|
2011-09-07 06:03:12 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
|
|
|
|
dev->wd_timeout = timeout;
|
2012-02-29 19:20:58 +00:00
|
|
|
wd_dev->timeout = timeout;
|
2011-09-07 06:03:12 +00:00
|
|
|
mei_wd_set_start_timeout(dev, dev->wd_timeout);
|
|
|
|
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-09-07 06:03:10 +00:00
|
|
|
/*
|
|
|
|
* Watchdog Device structs
|
|
|
|
*/
|
2011-10-23 16:30:39 +00:00
|
|
|
static const struct watchdog_ops wd_ops = {
|
2011-09-07 06:03:10 +00:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.start = mei_wd_ops_start,
|
|
|
|
.stop = mei_wd_ops_stop,
|
2011-09-07 06:03:11 +00:00
|
|
|
.ping = mei_wd_ops_ping,
|
2011-09-07 06:03:12 +00:00
|
|
|
.set_timeout = mei_wd_ops_set_timeout,
|
2011-09-07 06:03:10 +00:00
|
|
|
};
|
2011-10-23 16:30:39 +00:00
|
|
|
static const struct watchdog_info wd_info = {
|
2011-09-07 06:03:10 +00:00
|
|
|
.identity = INTEL_AMT_WATCHDOG_ID,
|
2012-08-16 16:39:41 +00:00
|
|
|
.options = WDIOF_KEEPALIVEPING |
|
|
|
|
WDIOF_SETTIMEOUT |
|
|
|
|
WDIOF_ALARMONLY,
|
2011-09-07 06:03:10 +00:00
|
|
|
};
|
|
|
|
|
2012-04-02 17:32:38 +00:00
|
|
|
static struct watchdog_device amt_wd_dev = {
|
2011-09-07 06:03:10 +00:00
|
|
|
.info = &wd_info,
|
|
|
|
.ops = &wd_ops,
|
2012-08-16 16:39:42 +00:00
|
|
|
.timeout = MEI_WD_DEFAULT_TIMEOUT,
|
|
|
|
.min_timeout = MEI_WD_MIN_TIMEOUT,
|
|
|
|
.max_timeout = MEI_WD_MAX_TIMEOUT,
|
2011-09-07 06:03:10 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
|
2014-02-17 13:13:21 +00:00
|
|
|
int mei_watchdog_register(struct mei_device *dev)
|
2011-12-22 16:50:50 +00:00
|
|
|
{
|
2014-02-17 13:13:21 +00:00
|
|
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
/* unlock to perserve correct locking order */
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
ret = watchdog_register_device(&amt_wd_dev);
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (ret) {
|
2014-09-29 13:31:42 +00:00
|
|
|
dev_err(dev->dev, "wd: unable to register watchdog device = %d.\n",
|
2014-02-17 13:13:21 +00:00
|
|
|
ret);
|
|
|
|
return ret;
|
2011-12-22 16:50:50 +00:00
|
|
|
}
|
2012-08-16 16:39:44 +00:00
|
|
|
|
2014-09-29 13:31:42 +00:00
|
|
|
dev_dbg(dev->dev, "wd: successfully register watchdog interface.\n");
|
2012-08-16 16:39:44 +00:00
|
|
|
watchdog_set_drvdata(&amt_wd_dev, dev);
|
2014-02-17 13:13:21 +00:00
|
|
|
return 0;
|
2011-12-22 16:50:50 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void mei_watchdog_unregister(struct mei_device *dev)
|
|
|
|
{
|
2012-12-16 11:23:17 +00:00
|
|
|
if (watchdog_get_drvdata(&amt_wd_dev) == NULL)
|
2012-08-16 16:39:44 +00:00
|
|
|
return;
|
|
|
|
|
|
|
|
watchdog_set_drvdata(&amt_wd_dev, NULL);
|
|
|
|
watchdog_unregister_device(&amt_wd_dev);
|
2011-12-22 16:50:50 +00:00
|
|
|
}
|
|
|
|
|