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7692a98269
Fixes sparse warning: drivers/watchdog/mei_wdt.c:530:18: warning: Variable length array is used Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Reviewed-by: Alexander Usyskin <alexander.usyskin@intel.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
692 lines
15 KiB
C
692 lines
15 KiB
C
/*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2015, 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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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/debugfs.h>
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#include <linux/completion.h>
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#include <linux/watchdog.h>
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#include <linux/uuid.h>
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#include <linux/mei_cl_bus.h>
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/*
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* iAMT Watchdog Device
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*/
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#define INTEL_AMT_WATCHDOG_ID "iamt_wdt"
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#define MEI_WDT_DEFAULT_TIMEOUT 120 /* seconds */
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#define MEI_WDT_MIN_TIMEOUT 120 /* seconds */
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#define MEI_WDT_MAX_TIMEOUT 65535 /* seconds */
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/* Commands */
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#define MEI_MANAGEMENT_CONTROL 0x02
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/* MEI Management Control version number */
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#define MEI_MC_VERSION_NUMBER 0x10
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/* Sub Commands */
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#define MEI_MC_START_WD_TIMER_REQ 0x13
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#define MEI_MC_START_WD_TIMER_RES 0x83
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#define MEI_WDT_STATUS_SUCCESS 0
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#define MEI_WDT_WDSTATE_NOT_REQUIRED 0x1
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#define MEI_MC_STOP_WD_TIMER_REQ 0x14
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/**
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* enum mei_wdt_state - internal watchdog state
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*
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* @MEI_WDT_PROBE: wd in probing stage
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* @MEI_WDT_IDLE: wd is idle and not opened
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* @MEI_WDT_START: wd was opened, start was called
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* @MEI_WDT_RUNNING: wd is expecting keep alive pings
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* @MEI_WDT_STOPPING: wd is stopping and will move to IDLE
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* @MEI_WDT_NOT_REQUIRED: wd device is not required
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*/
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enum mei_wdt_state {
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MEI_WDT_PROBE,
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MEI_WDT_IDLE,
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MEI_WDT_START,
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MEI_WDT_RUNNING,
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MEI_WDT_STOPPING,
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MEI_WDT_NOT_REQUIRED,
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};
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static const char *mei_wdt_state_str(enum mei_wdt_state state)
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{
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switch (state) {
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case MEI_WDT_PROBE:
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return "PROBE";
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case MEI_WDT_IDLE:
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return "IDLE";
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case MEI_WDT_START:
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return "START";
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case MEI_WDT_RUNNING:
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return "RUNNING";
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case MEI_WDT_STOPPING:
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return "STOPPING";
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case MEI_WDT_NOT_REQUIRED:
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return "NOT_REQUIRED";
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default:
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return "unknown";
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}
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}
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/**
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* struct mei_wdt - mei watchdog driver
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* @wdd: watchdog device
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*
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* @cldev: mei watchdog client device
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* @state: watchdog internal state
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* @resp_required: ping required response
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* @response: ping response completion
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* @unregister: unregister worker
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* @reg_lock: watchdog device registration lock
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* @timeout: watchdog current timeout
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*
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* @dbgfs_dir: debugfs dir entry
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*/
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struct mei_wdt {
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struct watchdog_device wdd;
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struct mei_cl_device *cldev;
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enum mei_wdt_state state;
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bool resp_required;
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struct completion response;
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struct work_struct unregister;
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struct mutex reg_lock;
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u16 timeout;
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#if IS_ENABLED(CONFIG_DEBUG_FS)
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struct dentry *dbgfs_dir;
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#endif /* CONFIG_DEBUG_FS */
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};
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/*
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* struct mei_mc_hdr - Management Control Command Header
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*
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* @command: Management Control (0x2)
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* @bytecount: Number of bytes in the message beyond this byte
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* @subcommand: Management Control Subcommand
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* @versionnumber: Management Control Version (0x10)
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*/
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struct mei_mc_hdr {
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u8 command;
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u8 bytecount;
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u8 subcommand;
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u8 versionnumber;
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};
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/**
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* struct mei_wdt_start_request watchdog start/ping
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*
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* @hdr: Management Control Command Header
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* @timeout: timeout value
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* @reserved: reserved (legacy)
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*/
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struct mei_wdt_start_request {
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struct mei_mc_hdr hdr;
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u16 timeout;
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u8 reserved[17];
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} __packed;
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/**
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* struct mei_wdt_start_response watchdog start/ping response
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*
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* @hdr: Management Control Command Header
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* @status: operation status
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* @wdstate: watchdog status bit mask
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*/
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struct mei_wdt_start_response {
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struct mei_mc_hdr hdr;
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u8 status;
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u8 wdstate;
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} __packed;
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/**
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* struct mei_wdt_stop_request - watchdog stop
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*
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* @hdr: Management Control Command Header
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*/
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struct mei_wdt_stop_request {
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struct mei_mc_hdr hdr;
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} __packed;
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/**
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* mei_wdt_ping - send wd start/ping command
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*
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* @wdt: mei watchdog device
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*
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* Return: 0 on success,
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* negative errno code on failure
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*/
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static int mei_wdt_ping(struct mei_wdt *wdt)
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{
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struct mei_wdt_start_request req;
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const size_t req_len = sizeof(req);
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int ret;
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memset(&req, 0, req_len);
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req.hdr.command = MEI_MANAGEMENT_CONTROL;
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req.hdr.bytecount = req_len - offsetof(struct mei_mc_hdr, subcommand);
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req.hdr.subcommand = MEI_MC_START_WD_TIMER_REQ;
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req.hdr.versionnumber = MEI_MC_VERSION_NUMBER;
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req.timeout = wdt->timeout;
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ret = mei_cldev_send(wdt->cldev, (u8 *)&req, req_len);
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if (ret < 0)
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return ret;
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return 0;
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}
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/**
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* mei_wdt_stop - send wd stop command
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*
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* @wdt: mei watchdog device
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*
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* Return: 0 on success,
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* negative errno code on failure
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*/
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static int mei_wdt_stop(struct mei_wdt *wdt)
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{
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struct mei_wdt_stop_request req;
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const size_t req_len = sizeof(req);
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int ret;
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memset(&req, 0, req_len);
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req.hdr.command = MEI_MANAGEMENT_CONTROL;
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req.hdr.bytecount = req_len - offsetof(struct mei_mc_hdr, subcommand);
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req.hdr.subcommand = MEI_MC_STOP_WD_TIMER_REQ;
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req.hdr.versionnumber = MEI_MC_VERSION_NUMBER;
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ret = mei_cldev_send(wdt->cldev, (u8 *)&req, req_len);
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if (ret < 0)
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return ret;
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return 0;
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}
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/**
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* mei_wdt_ops_start - wd start command from the watchdog core.
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*
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* @wdd: watchdog device
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*
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* Return: 0 on success or -ENODEV;
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*/
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static int mei_wdt_ops_start(struct watchdog_device *wdd)
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{
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struct mei_wdt *wdt = watchdog_get_drvdata(wdd);
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wdt->state = MEI_WDT_START;
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wdd->timeout = wdt->timeout;
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return 0;
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}
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/**
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* mei_wdt_ops_stop - wd stop command from the watchdog core.
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*
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* @wdd: watchdog device
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*
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* Return: 0 if success, negative errno code for failure
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*/
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static int mei_wdt_ops_stop(struct watchdog_device *wdd)
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{
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struct mei_wdt *wdt = watchdog_get_drvdata(wdd);
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int ret;
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if (wdt->state != MEI_WDT_RUNNING)
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return 0;
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wdt->state = MEI_WDT_STOPPING;
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ret = mei_wdt_stop(wdt);
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if (ret)
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return ret;
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wdt->state = MEI_WDT_IDLE;
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return 0;
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}
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/**
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* mei_wdt_ops_ping - wd ping command from the watchdog core.
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*
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* @wdd: watchdog device
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*
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* Return: 0 if success, negative errno code on failure
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*/
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static int mei_wdt_ops_ping(struct watchdog_device *wdd)
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{
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struct mei_wdt *wdt = watchdog_get_drvdata(wdd);
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int ret;
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if (wdt->state != MEI_WDT_START && wdt->state != MEI_WDT_RUNNING)
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return 0;
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if (wdt->resp_required)
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init_completion(&wdt->response);
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wdt->state = MEI_WDT_RUNNING;
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ret = mei_wdt_ping(wdt);
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if (ret)
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return ret;
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if (wdt->resp_required)
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ret = wait_for_completion_killable(&wdt->response);
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return ret;
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}
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/**
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* mei_wdt_ops_set_timeout - wd set timeout command from the watchdog core.
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*
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* @wdd: watchdog device
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* @timeout: timeout value to set
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*
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* Return: 0 if success, negative errno code for failure
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*/
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static int mei_wdt_ops_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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struct mei_wdt *wdt = watchdog_get_drvdata(wdd);
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/* valid value is already checked by the caller */
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wdt->timeout = timeout;
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wdd->timeout = timeout;
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return 0;
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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_wdt_ops_start,
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.stop = mei_wdt_ops_stop,
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.ping = mei_wdt_ops_ping,
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.set_timeout = mei_wdt_ops_set_timeout,
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};
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/* not const as the firmware_version field need to be retrieved */
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static 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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/**
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* __mei_wdt_is_registered - check if wdt is registered
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*
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* @wdt: mei watchdog device
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*
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* Return: true if the wdt is registered with the watchdog subsystem
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* Locking: should be called under wdt->reg_lock
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*/
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static inline bool __mei_wdt_is_registered(struct mei_wdt *wdt)
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{
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return !!watchdog_get_drvdata(&wdt->wdd);
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}
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/**
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* mei_wdt_unregister - unregister from the watchdog subsystem
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*
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* @wdt: mei watchdog device
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*/
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static void mei_wdt_unregister(struct mei_wdt *wdt)
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{
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mutex_lock(&wdt->reg_lock);
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if (__mei_wdt_is_registered(wdt)) {
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watchdog_unregister_device(&wdt->wdd);
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watchdog_set_drvdata(&wdt->wdd, NULL);
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memset(&wdt->wdd, 0, sizeof(wdt->wdd));
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}
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mutex_unlock(&wdt->reg_lock);
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}
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/**
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* mei_wdt_register - register with the watchdog subsystem
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*
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* @wdt: mei watchdog device
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*
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* Return: 0 if success, negative errno code for failure
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*/
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static int mei_wdt_register(struct mei_wdt *wdt)
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{
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struct device *dev;
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int ret;
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if (!wdt || !wdt->cldev)
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return -EINVAL;
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dev = &wdt->cldev->dev;
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mutex_lock(&wdt->reg_lock);
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if (__mei_wdt_is_registered(wdt)) {
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ret = 0;
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goto out;
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}
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wdt->wdd.info = &wd_info;
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wdt->wdd.ops = &wd_ops;
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wdt->wdd.parent = dev;
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wdt->wdd.timeout = MEI_WDT_DEFAULT_TIMEOUT;
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wdt->wdd.min_timeout = MEI_WDT_MIN_TIMEOUT;
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wdt->wdd.max_timeout = MEI_WDT_MAX_TIMEOUT;
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watchdog_set_drvdata(&wdt->wdd, wdt);
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watchdog_stop_on_reboot(&wdt->wdd);
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ret = watchdog_register_device(&wdt->wdd);
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if (ret) {
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dev_err(dev, "unable to register watchdog device = %d.\n", ret);
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watchdog_set_drvdata(&wdt->wdd, NULL);
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}
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wdt->state = MEI_WDT_IDLE;
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out:
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mutex_unlock(&wdt->reg_lock);
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return ret;
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}
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static void mei_wdt_unregister_work(struct work_struct *work)
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{
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struct mei_wdt *wdt = container_of(work, struct mei_wdt, unregister);
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mei_wdt_unregister(wdt);
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}
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/**
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* mei_wdt_rx - callback for data receive
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*
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* @cldev: bus device
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*/
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static void mei_wdt_rx(struct mei_cl_device *cldev)
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{
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struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);
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struct mei_wdt_start_response res;
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const size_t res_len = sizeof(res);
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int ret;
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ret = mei_cldev_recv(wdt->cldev, (u8 *)&res, res_len);
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if (ret < 0) {
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dev_err(&cldev->dev, "failure in recv %d\n", ret);
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return;
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}
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/* Empty response can be sent on stop */
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if (ret == 0)
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return;
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if (ret < sizeof(struct mei_mc_hdr)) {
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dev_err(&cldev->dev, "recv small data %d\n", ret);
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return;
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}
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if (res.hdr.command != MEI_MANAGEMENT_CONTROL ||
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res.hdr.versionnumber != MEI_MC_VERSION_NUMBER) {
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dev_err(&cldev->dev, "wrong command received\n");
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return;
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}
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if (res.hdr.subcommand != MEI_MC_START_WD_TIMER_RES) {
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dev_warn(&cldev->dev, "unsupported command %d :%s[%d]\n",
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res.hdr.subcommand,
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mei_wdt_state_str(wdt->state),
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wdt->state);
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return;
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}
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/* Run the unregistration in a worker as this can be
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* run only after ping completion, otherwise the flow will
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* deadlock on watchdog core mutex.
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*/
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if (wdt->state == MEI_WDT_RUNNING) {
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if (res.wdstate & MEI_WDT_WDSTATE_NOT_REQUIRED) {
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wdt->state = MEI_WDT_NOT_REQUIRED;
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schedule_work(&wdt->unregister);
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}
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goto out;
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}
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if (wdt->state == MEI_WDT_PROBE) {
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if (res.wdstate & MEI_WDT_WDSTATE_NOT_REQUIRED) {
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wdt->state = MEI_WDT_NOT_REQUIRED;
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} else {
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/* stop the watchdog and register watchdog device */
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mei_wdt_stop(wdt);
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mei_wdt_register(wdt);
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}
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return;
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}
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dev_warn(&cldev->dev, "not in correct state %s[%d]\n",
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mei_wdt_state_str(wdt->state), wdt->state);
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out:
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if (!completion_done(&wdt->response))
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complete(&wdt->response);
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}
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/*
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* mei_wdt_notif - callback for event notification
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*
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* @cldev: bus device
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*/
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static void mei_wdt_notif(struct mei_cl_device *cldev)
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{
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struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);
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if (wdt->state != MEI_WDT_NOT_REQUIRED)
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return;
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mei_wdt_register(wdt);
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}
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#if IS_ENABLED(CONFIG_DEBUG_FS)
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static ssize_t mei_dbgfs_read_activation(struct file *file, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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struct mei_wdt *wdt = file->private_data;
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const size_t bufsz = 32;
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char buf[32];
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ssize_t pos;
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mutex_lock(&wdt->reg_lock);
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pos = scnprintf(buf, bufsz, "%s\n",
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__mei_wdt_is_registered(wdt) ? "activated" : "deactivated");
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mutex_unlock(&wdt->reg_lock);
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return simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
|
|
}
|
|
|
|
static const struct file_operations dbgfs_fops_activation = {
|
|
.open = simple_open,
|
|
.read = mei_dbgfs_read_activation,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t mei_dbgfs_read_state(struct file *file, char __user *ubuf,
|
|
size_t cnt, loff_t *ppos)
|
|
{
|
|
struct mei_wdt *wdt = file->private_data;
|
|
char buf[32];
|
|
ssize_t pos;
|
|
|
|
pos = scnprintf(buf, sizeof(buf), "state: %s\n",
|
|
mei_wdt_state_str(wdt->state));
|
|
|
|
return simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
|
|
}
|
|
|
|
static const struct file_operations dbgfs_fops_state = {
|
|
.open = simple_open,
|
|
.read = mei_dbgfs_read_state,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static void dbgfs_unregister(struct mei_wdt *wdt)
|
|
{
|
|
debugfs_remove_recursive(wdt->dbgfs_dir);
|
|
wdt->dbgfs_dir = NULL;
|
|
}
|
|
|
|
static int dbgfs_register(struct mei_wdt *wdt)
|
|
{
|
|
struct dentry *dir, *f;
|
|
|
|
dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
|
|
if (!dir)
|
|
return -ENOMEM;
|
|
|
|
wdt->dbgfs_dir = dir;
|
|
f = debugfs_create_file("state", S_IRUSR, dir, wdt, &dbgfs_fops_state);
|
|
if (!f)
|
|
goto err;
|
|
|
|
f = debugfs_create_file("activation", S_IRUSR,
|
|
dir, wdt, &dbgfs_fops_activation);
|
|
if (!f)
|
|
goto err;
|
|
|
|
return 0;
|
|
err:
|
|
dbgfs_unregister(wdt);
|
|
return -ENODEV;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void dbgfs_unregister(struct mei_wdt *wdt) {}
|
|
|
|
static inline int dbgfs_register(struct mei_wdt *wdt)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
static int mei_wdt_probe(struct mei_cl_device *cldev,
|
|
const struct mei_cl_device_id *id)
|
|
{
|
|
struct mei_wdt *wdt;
|
|
int ret;
|
|
|
|
wdt = kzalloc(sizeof(struct mei_wdt), GFP_KERNEL);
|
|
if (!wdt)
|
|
return -ENOMEM;
|
|
|
|
wdt->timeout = MEI_WDT_DEFAULT_TIMEOUT;
|
|
wdt->state = MEI_WDT_PROBE;
|
|
wdt->cldev = cldev;
|
|
wdt->resp_required = mei_cldev_ver(cldev) > 0x1;
|
|
mutex_init(&wdt->reg_lock);
|
|
init_completion(&wdt->response);
|
|
INIT_WORK(&wdt->unregister, mei_wdt_unregister_work);
|
|
|
|
mei_cldev_set_drvdata(cldev, wdt);
|
|
|
|
ret = mei_cldev_enable(cldev);
|
|
if (ret < 0) {
|
|
dev_err(&cldev->dev, "Could not enable cl device\n");
|
|
goto err_out;
|
|
}
|
|
|
|
ret = mei_cldev_register_rx_cb(wdt->cldev, mei_wdt_rx);
|
|
if (ret) {
|
|
dev_err(&cldev->dev, "Could not reg rx event ret=%d\n", ret);
|
|
goto err_disable;
|
|
}
|
|
|
|
ret = mei_cldev_register_notif_cb(wdt->cldev, mei_wdt_notif);
|
|
/* on legacy devices notification is not supported
|
|
*/
|
|
if (ret && ret != -EOPNOTSUPP) {
|
|
dev_err(&cldev->dev, "Could not reg notif event ret=%d\n", ret);
|
|
goto err_disable;
|
|
}
|
|
|
|
wd_info.firmware_version = mei_cldev_ver(cldev);
|
|
|
|
if (wdt->resp_required)
|
|
ret = mei_wdt_ping(wdt);
|
|
else
|
|
ret = mei_wdt_register(wdt);
|
|
|
|
if (ret)
|
|
goto err_disable;
|
|
|
|
if (dbgfs_register(wdt))
|
|
dev_warn(&cldev->dev, "cannot register debugfs\n");
|
|
|
|
return 0;
|
|
|
|
err_disable:
|
|
mei_cldev_disable(cldev);
|
|
|
|
err_out:
|
|
kfree(wdt);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mei_wdt_remove(struct mei_cl_device *cldev)
|
|
{
|
|
struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);
|
|
|
|
/* Free the caller in case of fw initiated or unexpected reset */
|
|
if (!completion_done(&wdt->response))
|
|
complete(&wdt->response);
|
|
|
|
cancel_work_sync(&wdt->unregister);
|
|
|
|
mei_wdt_unregister(wdt);
|
|
|
|
mei_cldev_disable(cldev);
|
|
|
|
dbgfs_unregister(wdt);
|
|
|
|
kfree(wdt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
|
|
0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB)
|
|
|
|
static const struct mei_cl_device_id mei_wdt_tbl[] = {
|
|
{ .uuid = MEI_UUID_WD, .version = MEI_CL_VERSION_ANY },
|
|
/* required last entry */
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(mei, mei_wdt_tbl);
|
|
|
|
static struct mei_cl_driver mei_wdt_driver = {
|
|
.id_table = mei_wdt_tbl,
|
|
.name = KBUILD_MODNAME,
|
|
|
|
.probe = mei_wdt_probe,
|
|
.remove = mei_wdt_remove,
|
|
};
|
|
|
|
module_mei_cl_driver(mei_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Intel Corporation");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Device driver for Intel MEI iAMT watchdog");
|