Oren Weil | 3ceb3e6 | 2011-05-15 13:43:47 +0300 | [diff] [blame] | 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> |
| 20 | #include <linux/pci.h> |
| 21 | #include <linux/sched.h> |
| 22 | |
| 23 | #include "mei_dev.h" |
| 24 | #include "hw.h" |
| 25 | #include "interface.h" |
| 26 | #include "mei.h" |
| 27 | |
| 28 | /* |
| 29 | * MEI Watchdog Module Parameters |
| 30 | */ |
| 31 | static u16 watchdog_timeout = AMT_WD_VALUE; |
| 32 | module_param(watchdog_timeout, ushort, 0); |
| 33 | MODULE_PARM_DESC(watchdog_timeout, |
| 34 | "Intel(R) AMT Watchdog timeout value in seconds. (default=" |
| 35 | __MODULE_STRING(AMT_WD_VALUE) |
| 36 | ", disable=0)"); |
| 37 | |
| 38 | static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 }; |
| 39 | static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 }; |
| 40 | |
| 41 | const u8 mei_wd_state_independence_msg[3][4] = { |
| 42 | {0x05, 0x02, 0x51, 0x10}, |
| 43 | {0x05, 0x02, 0x52, 0x10}, |
| 44 | {0x07, 0x02, 0x01, 0x10} |
| 45 | }; |
| 46 | |
| 47 | /* UUIDs for AMT F/W clients */ |
| 48 | const uuid_le mei_wd_guid = UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, 0x89, |
| 49 | 0x9D, 0xA9, 0x15, 0x14, 0xCB, |
| 50 | 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 | |
| 70 | /* look for WD client and connect to it */ |
| 71 | dev->wd_cl.state = MEI_FILE_DISCONNECTED; |
| 72 | dev->wd_timeout = watchdog_timeout; |
| 73 | |
| 74 | if (dev->wd_timeout > 0) { |
| 75 | mei_wd_start_setup(dev); |
| 76 | /* find ME WD client */ |
| 77 | mei_find_me_client_update_filext(dev, &dev->wd_cl, |
| 78 | &mei_wd_guid, MEI_WD_HOST_CLIENT_ID); |
| 79 | |
| 80 | dev_dbg(&dev->pdev->dev, "check wd_cl\n"); |
| 81 | if (MEI_FILE_CONNECTING == dev->wd_cl.state) { |
| 82 | if (!mei_connect(dev, &dev->wd_cl)) { |
| 83 | dev_dbg(&dev->pdev->dev, "Failed to connect to WD client\n"); |
| 84 | dev->wd_cl.state = MEI_FILE_DISCONNECTED; |
| 85 | dev->wd_cl.host_client_id = 0; |
| 86 | 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); |
Tomas Winkler | a534bb6 | 2011-06-13 16:39:31 +0300 | [diff] [blame] | 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 | } |
Oren Weil | 3ceb3e6 | 2011-05-15 13:43:47 +0300 | [diff] [blame] | 181 | |
| 182 | if (preserve) |
| 183 | dev->wd_timeout = wd_timeout; |
| 184 | |
| 185 | out: |
| 186 | return ret; |
| 187 | } |
| 188 | |