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Viewing changes to drivers/staging/mei/wd.c

  • Committer: Bazaar Package Importer
  • Author(s): Paolo Pisati
  • Date: 2011-06-29 15:23:51 UTC
  • mfrom: (26.1.1 natty-proposed)
  • Revision ID: james.westby@ubuntu.com-20110629152351-xs96tm303d95rpbk
Tags: 3.0.0-1200.2
* Rebased against 3.0.0-6.7
* BSP from TI based on 3.0.0

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drivers/staging/mei/wd.c
 
1
/*
 
2
 *
 
3
 * Intel Management Engine Interface (Intel MEI) Linux driver
 
4
 * Copyright (c) 2003-2011, Intel Corporation.
 
5
 *
 
6
 * This program is free software; you can redistribute it and/or modify it
 
7
 * under the terms and conditions of the GNU General Public License,
 
8
 * version 2, as published by the Free Software Foundation.
 
9
 *
 
10
 * This program is distributed in the hope it will be useful, but WITHOUT
 
11
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 
12
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 
13
 * more details.
 
14
 *
 
15
 */
 
16
#include <linux/kernel.h>
 
17
#include <linux/module.h>
 
18
#include <linux/moduleparam.h>
 
19
#include <linux/device.h>
 
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#include <linux/pci.h>
 
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#include <linux/sched.h>
 
22
 
 
23
#include "mei_dev.h"
 
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#include "hw.h"
 
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#include "interface.h"
 
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#include "mei.h"
 
27
 
 
28
/*
 
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 * MEI Watchdog Module Parameters
 
30
 */
 
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static u16 watchdog_timeout = AMT_WD_VALUE;
 
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module_param(watchdog_timeout, ushort, 0);
 
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MODULE_PARM_DESC(watchdog_timeout,
 
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                "Intel(R) AMT Watchdog timeout value in seconds. (default="
 
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                                        __MODULE_STRING(AMT_WD_VALUE)
 
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                                        ", disable=0)");
 
37
 
 
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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 };
 
40
 
 
41
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}
 
45
};
 
46
 
 
47
/* 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);
 
51
 
 
52
 
 
53
void mei_wd_start_setup(struct mei_device *dev)
 
54
{
 
55
        dev_dbg(&dev->pdev->dev, "dev->wd_timeout=%d.\n", dev->wd_timeout);
 
56
        memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE);
 
57
        memcpy(dev->wd_data + MEI_WD_PARAMS_SIZE,
 
58
                &dev->wd_timeout, sizeof(u16));
 
59
}
 
60
 
 
61
/**
 
62
 * host_init_wd - mei initialization wd.
 
63
 *
 
64
 * @dev: the device structure
 
65
 */
 
66
void mei_wd_host_init(struct mei_device *dev)
 
67
{
 
68
        mei_init_file_private(&dev->wd_cl, dev);
 
69
 
 
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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 = watchdog_timeout;
 
73
 
 
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        if (dev->wd_timeout > 0) {
 
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                mei_wd_start_setup(dev);
 
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                /* find ME WD client */
 
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                mei_find_me_client_update_filext(dev, &dev->wd_cl,
 
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                                        &mei_wd_guid, MEI_WD_HOST_CLIENT_ID);
 
79
 
 
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                dev_dbg(&dev->pdev->dev, "check wd_cl\n");
 
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                if (MEI_FILE_CONNECTING == dev->wd_cl.state) {
 
82
                        if (!mei_connect(dev, &dev->wd_cl)) {
 
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                                dev_dbg(&dev->pdev->dev, "Failed to connect to WD 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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                                host_init_iamthif(dev) ;
 
87
                        } else {
 
88
                                dev->wd_cl.timer_count = CONNECT_TIMEOUT;
 
89
                        }
 
90
                } else {
 
91
                        dev_dbg(&dev->pdev->dev, "Failed to find WD client\n");
 
92
                        host_init_iamthif(dev) ;
 
93
                }
 
94
        } else {
 
95
                dev->wd_bypass = true;
 
96
                dev_dbg(&dev->pdev->dev, "WD requested to be disabled\n");
 
97
                host_init_iamthif(dev) ;
 
98
        }
 
99
}
 
100
 
 
101
/**
 
102
 * mei_wd_send - sends watch dog message to fw.
 
103
 *
 
104
 * @dev: the device structure
 
105
 *
 
106
 * returns 0 if success,
 
107
 *      -EIO when message send fails
 
108
 *      -EINVAL when invalid message is to be sent
 
109
 */
 
110
int mei_wd_send(struct mei_device *dev)
 
111
{
 
112
        struct mei_msg_hdr *mei_hdr;
 
113
 
 
114
        mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 
115
        mei_hdr->host_addr = dev->wd_cl.host_client_id;
 
116
        mei_hdr->me_addr = dev->wd_cl.me_client_id;
 
117
        mei_hdr->msg_complete = 1;
 
118
        mei_hdr->reserved = 0;
 
119
 
 
120
        if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE))
 
121
                mei_hdr->length = MEI_START_WD_DATA_SIZE;
 
122
        else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE))
 
123
                mei_hdr->length = MEI_WD_PARAMS_SIZE;
 
124
        else
 
125
                return -EINVAL;
 
126
 
 
127
        if (mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length))
 
128
                return 0;
 
129
        return -EIO;
 
130
}
 
131
 
 
132
int mei_wd_stop(struct mei_device *dev, bool preserve)
 
133
{
 
134
        int ret;
 
135
        u16 wd_timeout = dev->wd_timeout;
 
136
 
 
137
        cancel_delayed_work(&dev->wd_work);
 
138
        if (dev->wd_cl.state != MEI_FILE_CONNECTED || !dev->wd_timeout)
 
139
                return 0;
 
140
 
 
141
        dev->wd_timeout = 0;
 
142
        dev->wd_due_counter = 0;
 
143
        memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE);
 
144
        dev->stop = 1;
 
145
 
 
146
        ret = mei_flow_ctrl_creds(dev, &dev->wd_cl);
 
147
        if (ret < 0)
 
148
                goto out;
 
149
 
 
150
        if (ret && dev->mei_host_buffer_is_empty) {
 
151
                ret = 0;
 
152
                dev->mei_host_buffer_is_empty = 0;
 
153
 
 
154
                if (!mei_wd_send(dev)) {
 
155
                        ret = mei_flow_ctrl_reduce(dev, &dev->wd_cl);
 
156
                        if (ret)
 
157
                                goto out;
 
158
                } else {
 
159
                        dev_dbg(&dev->pdev->dev, "send stop WD failed\n");
 
160
                }
 
161
 
 
162
                dev->wd_pending = 0;
 
163
        } else {
 
164
                dev->wd_pending = 1;
 
165
        }
 
166
        dev->wd_stopped = 0;
 
167
        mutex_unlock(&dev->device_lock);
 
168
 
 
169
        ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
 
170
                                        dev->wd_stopped, 10 * HZ);
 
171
        mutex_lock(&dev->device_lock);
 
172
        if (dev->wd_stopped) {
 
173
                dev_dbg(&dev->pdev->dev, "stop wd complete ret=%d.\n", ret);
 
174
                ret = 0;
 
175
        } else {
 
176
                if (!ret)
 
177
                        ret = -ETIMEDOUT;
 
178
                dev_warn(&dev->pdev->dev,
 
179
                        "stop wd failed to complete ret=%d.\n", ret);
 
180
        }
 
181
 
 
182
        if (preserve)
 
183
                dev->wd_timeout = wd_timeout;
 
184
 
 
185
out:
 
186
        return ret;
 
187
}
 
188