/* * Driver for the MTX-1 Watchdog. * * (C) Copyright 2005 4G Systems , * All Rights Reserved. * http://www.4g-systems.biz * * (C) Copyright 2007 OpenWrt.org, Florian Fainelli * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Neither Michael Stickel nor 4G Systems admit liability nor provide * warranty for any of this software. This material is provided * "AS-IS" and at no charge. * * (c) Copyright 2005 4G Systems * * Release 0.01. * Author: Michael Stickel michael.stickel@4g-systems.biz * * Release 0.02. * Author: Florian Fainelli florian@openwrt.org * use the Linux watchdog/timer APIs * * The Watchdog is configured to reset the MTX-1 * if it is not triggered for 100 seconds. * It should not be triggered more often than 1.6 seconds. * * A timer triggers the watchdog every 5 seconds, until * it is opened for the first time. After the first open * it MUST be triggered every 2..95 seconds. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MTX1_WDT_INTERVAL (5 * HZ) static int ticks = 100 * HZ; static struct { struct completion stop; spinlock_t lock; int running; struct timer_list timer; int queue; int default_ticks; unsigned long inuse; unsigned gpio; unsigned int gstate; } mtx1_wdt_device; static void mtx1_wdt_trigger(unsigned long unused) { spin_lock(&mtx1_wdt_device.lock); if (mtx1_wdt_device.running) ticks--; /* toggle wdt gpio */ mtx1_wdt_device.gstate = !mtx1_wdt_device.gstate; gpio_set_value(mtx1_wdt_device.gpio, mtx1_wdt_device.gstate); if (mtx1_wdt_device.queue && ticks) mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL); else complete(&mtx1_wdt_device.stop); spin_unlock(&mtx1_wdt_device.lock); } static void mtx1_wdt_reset(void) { ticks = mtx1_wdt_device.default_ticks; } static void mtx1_wdt_start(void) { unsigned long flags; spin_lock_irqsave(&mtx1_wdt_device.lock, flags); if (!mtx1_wdt_device.queue) { mtx1_wdt_device.queue = 1; mtx1_wdt_device.gstate = 1; gpio_set_value(mtx1_wdt_device.gpio, 1); mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL); } mtx1_wdt_device.running++; spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags); } static int mtx1_wdt_stop(void) { unsigned long flags; spin_lock_irqsave(&mtx1_wdt_device.lock, flags); if (mtx1_wdt_device.queue) { mtx1_wdt_device.queue = 0; mtx1_wdt_device.gstate = 0; gpio_set_value(mtx1_wdt_device.gpio, 0); } ticks = mtx1_wdt_device.default_ticks; spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags); return 0; } /* Filesystem functions */ static int mtx1_wdt_open(struct inode *inode, struct file *file) { if (test_and_set_bit(0, &mtx1_wdt_device.inuse)) return -EBUSY; return nonseekable_open(inode, file); } static int mtx1_wdt_release(struct inode *inode, struct file *file) { clear_bit(0, &mtx1_wdt_device.inuse); return 0; } static long mtx1_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = (int __user *)argp; unsigned int value; static const struct watchdog_info ident = { .options = WDIOF_CARDRESET, .identity = "MTX-1 WDT", }; switch (cmd) { case WDIOC_GETSUPPORT: if (copy_to_user(argp, &ident, sizeof(ident))) return -EFAULT; break; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: put_user(0, p); break; case WDIOC_SETOPTIONS: if (get_user(value, p)) return -EFAULT; if (value & WDIOS_ENABLECARD) mtx1_wdt_start(); else if (value & WDIOS_DISABLECARD) mtx1_wdt_stop(); else return -EINVAL; return 0; case WDIOC_KEEPALIVE: mtx1_wdt_reset(); break; default: return -ENOTTY; } return 0; } static ssize_t mtx1_wdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos) { if (!count) return -EIO; mtx1_wdt_reset(); return count; } static const struct file_operations mtx1_wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .unlocked_ioctl = mtx1_wdt_ioctl, .open = mtx1_wdt_open, .write = mtx1_wdt_write, .release = mtx1_wdt_release, }; static struct miscdevice mtx1_wdt_misc = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &mtx1_wdt_fops, }; static int mtx1_wdt_probe(struct platform_device *pdev) { int ret; mtx1_wdt_device.gpio = pdev->resource[0].start; ret = devm_gpio_request_one(&pdev->dev, mtx1_wdt_device.gpio, GPIOF_OUT_INIT_HIGH, "mtx1-wdt"); if (ret < 0) { dev_err(&pdev->dev, "failed to request gpio"); return ret; } spin_lock_init(&mtx1_wdt_device.lock); init_completion(&mtx1_wdt_device.stop); mtx1_wdt_device.queue = 0; clear_bit(0, &mtx1_wdt_device.inuse); setup_timer(&mtx1_wdt_device.timer, mtx1_wdt_trigger, 0L); mtx1_wdt_device.default_ticks = ticks; ret = misc_register(&mtx1_wdt_misc); if (ret < 0) { dev_err(&pdev->dev, "failed to register\n"); return ret; } mtx1_wdt_start(); dev_info(&pdev->dev, "MTX-1 Watchdog driver\n"); return 0; } static int mtx1_wdt_remove(struct platform_device *pdev) { /* FIXME: do we need to lock this test ? */ if (mtx1_wdt_device.queue) { mtx1_wdt_device.queue = 0; wait_for_completion(&mtx1_wdt_device.stop); } misc_deregister(&mtx1_wdt_misc); return 0; } static struct platform_driver mtx1_wdt_driver = { .probe = mtx1_wdt_probe, .remove = mtx1_wdt_remove, .driver.name = "mtx1-wdt", .driver.owner = THIS_MODULE, }; module_platform_driver(mtx1_wdt_driver); MODULE_AUTHOR("Michael Stickel, Florian Fainelli"); MODULE_DESCRIPTION("Driver for the MTX-1 watchdog"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:mtx1-wdt"); y erroneously enable an energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not recommended to be enabled on this SKU. On the failing systems, this BIOS issue was not discovered when the desktop motherboard was tested with Windows, because the BIOS also neglects to provide the ACPI/CPPC table, that Windows requires to enable HWP, and so Windows runs in legacy P-state mode, where this setting has no effect. Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and so it runs in HWP mode, exposing this incorrect BIOS configuration. There are several ways to address this problem. First, Linux can also run in legacy P-state mode on this system. As intel_pstate is how Linux enables HWP, booting with "intel_pstate=disable" will run in acpi-cpufreq/ondemand legacy p-state mode. Or second, the "performance" governor can be used with intel_pstate, which will modify HWP.EPP to 0. Or third, starting in 4.10, the /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference attribute in can be updated from "balance_power" to "performance". Or fourth, apply this patch, which fixes the erroneous setting of MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default configuration to function as designed. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Cc: 4.6+ <stable@vger.kernel.org> # 4.6+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/scsi/scsi_ioctl.h')