/* * Watchdog driver for Broadcom BCM47XX * * Copyright (C) 2008 Aleksandar Radovanovic * Copyright (C) 2009 Matthieu CASTET * Copyright (C) 2012-2013 Hauke Mehrtens * * 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. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #define DRV_NAME "bcm47xx_wdt" #define WDT_DEFAULT_TIME 30 /* seconds */ #define WDT_SOFTTIMER_MAX 255 /* seconds */ #define WDT_SOFTTIMER_THRESHOLD 60 /* seconds */ static int timeout = WDT_DEFAULT_TIME; static bool nowayout = WATCHDOG_NOWAYOUT; module_param(timeout, int, 0); MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default=" __MODULE_STRING(WDT_DEFAULT_TIME) ")"); module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd) { return container_of(wdd, struct bcm47xx_wdt, wdd); } static int bcm47xx_wdt_hard_keepalive(struct watchdog_device *wdd) { struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); wdt->timer_set_ms(wdt, wdd->timeout * 1000); return 0; } static int bcm47xx_wdt_hard_start(struct watchdog_device *wdd) { return 0; } static int bcm47xx_wdt_hard_stop(struct watchdog_device *wdd) { struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); wdt->timer_set(wdt, 0); return 0; } static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd, unsigned int new_time) { struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); u32 max_timer = wdt->max_timer_ms; if (new_time < 1 || new_time > max_timer / 1000) { pr_warn("timeout value must be 1<=x<=%d, using %d\n", max_timer / 1000, new_time); return -EINVAL; } wdd->timeout = new_time; return 0; } static int bcm47xx_wdt_restart(struct watchdog_device *wdd, unsigned long action, void *data) { struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); wdt->timer_set(wdt, 1); return 0; } static struct watchdog_ops bcm47xx_wdt_hard_ops = { .owner = THIS_MODULE, .start = bcm47xx_wdt_hard_start, .stop = bcm47xx_wdt_hard_stop, .ping = bcm47xx_wdt_hard_keepalive, .set_timeout = bcm47xx_wdt_hard_set_timeout, .restart = bcm47xx_wdt_restart, }; static void bcm47xx_wdt_soft_timer_tick(unsigned long data) { struct bcm47xx_wdt *wdt = (struct bcm47xx_wdt *)data; u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms); if (!atomic_dec_and_test(&wdt->soft_ticks)) { wdt->timer_set_ms(wdt, next_tick); mod_timer(&wdt->soft_timer, jiffies + HZ); } else { pr_crit("Watchdog will fire soon!!!\n"); } } static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd) { struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); atomic_set(&wdt->soft_ticks, wdd->timeout); return 0; } static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd) { struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); bcm47xx_wdt_soft_keepalive(wdd); bcm47xx_wdt_soft_timer_tick((unsigned long)wdt); return 0; } static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd) { struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); del_timer_sync(&wdt->soft_timer); wdt->timer_set(wdt, 0); return 0; } static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd, unsigned int new_time) { if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) { pr_warn("timeout value must be 1<=x<=%d, using %d\n", WDT_SOFTTIMER_MAX, new_time); return -EINVAL; } wdd->timeout = new_time; return 0; } static const struct watchdog_info bcm47xx_wdt_info = { .identity = DRV_NAME, .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, }; static struct watchdog_ops bcm47xx_wdt_soft_ops = { .owner = THIS_MODULE, .start = bcm47xx_wdt_soft_start, .stop = bcm47xx_wdt_soft_stop, .ping = bcm47xx_wdt_soft_keepalive, .set_timeout = bcm47xx_wdt_soft_set_timeout, .restart = bcm47xx_wdt_restart, }; static int bcm47xx_wdt_probe(struct platform_device *pdev) { int ret; bool soft; struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); if (!wdt) return -ENXIO; soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000; if (soft) { wdt->wdd.ops = &bcm47xx_wdt_soft_ops; setup_timer(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick, (long unsigned int)wdt); } else { wdt->wdd.ops = &bcm47xx_wdt_hard_ops; } wdt->wdd.info = &bcm47xx_wdt_info; wdt->wdd.timeout = WDT_DEFAULT_TIME; wdt->wdd.parent = &pdev->dev; ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout); if (ret) goto err_timer; watchdog_set_nowayout(&wdt->wdd, nowayout); watchdog_set_restart_priority(&wdt->wdd, 64); watchdog_stop_on_reboot(&wdt->wdd); ret = watchdog_register_device(&wdt->wdd); if (ret) goto err_timer; dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n", timeout, nowayout ? ", nowayout" : "", soft ? ", Software Timer" : ""); return 0; err_timer: if (soft) del_timer_sync(&wdt->soft_timer); return ret; } static int bcm47xx_wdt_remove(struct platform_device *pdev) { struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); if (!wdt) return -ENXIO; watchdog_unregister_device(&wdt->wdd); return 0; } static struct platform_driver bcm47xx_wdt_driver = { .driver = { .name = "bcm47xx-wdt", }, .probe = bcm47xx_wdt_probe, .remove = bcm47xx_wdt_remove, }; module_platform_driver(bcm47xx_wdt_driver); MODULE_AUTHOR("Aleksandar Radovanovic"); MODULE_AUTHOR("Hauke Mehrtens "); MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx"); MODULE_LICENSE("GPL"); 2.c parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'sound/soc/samsung/s3c-i2s-v2.c')