diff options
| -rw-r--r-- | drivers/staging/mei/wd.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/staging/mei/wd.c b/drivers/staging/mei/wd.c new file mode 100644 index 000000000000..2564b038636a --- /dev/null +++ b/drivers/staging/mei/wd.c @@ -0,0 +1,183 @@ +/* + * + * Intel Management Engine Interface (Intel MEI) Linux driver + * Copyright (c) 2003-2011, 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 "mei_dev.h" +#include "hw.h" +#include "interface.h" +#include "mei.h" + +/* + * MEI Watchdog Module Parameters + */ +static u16 watchdog_timeout = AMT_WD_VALUE; +module_param(watchdog_timeout, ushort, 0); +MODULE_PARM_DESC(watchdog_timeout, + "Intel(R) AMT Watchdog timeout value in seconds. (default=" + __MODULE_STRING(AMT_WD_VALUE) + ", disable=0)"); + +static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 }; +static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 }; + +const u8 mei_wd_state_independence_msg[3][4] = { + {0x05, 0x02, 0x51, 0x10}, + {0x05, 0x02, 0x52, 0x10}, + {0x07, 0x02, 0x01, 0x10} +}; + +/* 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); + + +void mei_wd_start_setup(struct mei_device *dev) +{ + dev_dbg(&dev->pdev->dev, "dev->wd_timeout=%d.\n", dev->wd_timeout); + memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE); + memcpy(dev->wd_data + MEI_WD_PARAMS_SIZE, + &dev->wd_timeout, sizeof(u16)); +} + +/** + * host_init_wd - mei initialization wd. + * + * @dev: the device structure + */ +void mei_wd_host_init(struct mei_device *dev) +{ + mei_init_file_private(&dev->wd_cl, dev); + + /* look for WD client and connect to it */ + dev->wd_cl.state = MEI_FILE_DISCONNECTED; + dev->wd_timeout = watchdog_timeout; + + if (dev->wd_timeout > 0) { + mei_wd_start_setup(dev); + /* find ME WD client */ + mei_find_me_client_update_filext(dev, &dev->wd_cl, + &mei_wd_guid, MEI_WD_HOST_CLIENT_ID); + + dev_dbg(&dev->pdev->dev, "check wd_cl\n"); + if (MEI_FILE_CONNECTING == dev->wd_cl.state) { + if (!mei_connect(dev, &dev->wd_cl)) { + dev_dbg(&dev->pdev->dev, "Failed to connect to WD client\n"); + dev->wd_cl.state = MEI_FILE_DISCONNECTED; + dev->wd_cl.host_client_id = 0; + host_init_iamthif(dev) ; + } else { + dev->wd_cl.timer_count = CONNECT_TIMEOUT; + } + } else { + dev_dbg(&dev->pdev->dev, "Failed to find WD client\n"); + host_init_iamthif(dev) ; + } + } else { + dev->wd_bypass = true; + dev_dbg(&dev->pdev->dev, "WD requested to be disabled\n"); + host_init_iamthif(dev) ; + } +} + +/** + * 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 *mei_hdr; + + mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0]; + mei_hdr->host_addr = dev->wd_cl.host_client_id; + mei_hdr->me_addr = dev->wd_cl.me_client_id; + mei_hdr->msg_complete = 1; + mei_hdr->reserved = 0; + + if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE)) + mei_hdr->length = MEI_START_WD_DATA_SIZE; + else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE)) + mei_hdr->length = MEI_WD_PARAMS_SIZE; + else + return -EINVAL; + + if (mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length)) + return 0; + return -EIO; +} + +int mei_wd_stop(struct mei_device *dev, bool preserve) +{ + int ret; + u16 wd_timeout = dev->wd_timeout; + + cancel_delayed_work(&dev->wd_work); + if (dev->wd_cl.state != MEI_FILE_CONNECTED || !dev->wd_timeout) + return 0; + + dev->wd_timeout = 0; + dev->wd_due_counter = 0; + memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE); + dev->stop = 1; + + ret = mei_flow_ctrl_creds(dev, &dev->wd_cl); + if (ret < 0) + goto out; + + if (ret && dev->mei_host_buffer_is_empty) { + ret = 0; + dev->mei_host_buffer_is_empty = 0; + + if (!mei_wd_send(dev)) { + ret = mei_flow_ctrl_reduce(dev, &dev->wd_cl); + if (ret) + goto out; + } else { + dev_dbg(&dev->pdev->dev, "send stop WD failed\n"); + } + + dev->wd_pending = 0; + } else { + dev->wd_pending = 1; + } + dev->wd_stopped = 0; + mutex_unlock(&dev->device_lock); + + ret = wait_event_interruptible_timeout(dev->wait_stop_wd, + dev->wd_stopped, 10 * HZ); + mutex_lock(&dev->device_lock); + if (!dev->wd_stopped) + dev_dbg(&dev->pdev->dev, "stop wd failed to complete.\n"); + else + dev_dbg(&dev->pdev->dev, "stop wd complete.\n"); + + if (preserve) + dev->wd_timeout = wd_timeout; + +out: + return ret; +} + |