/* * Copyright (C) 2015 Mans Rullgard * SMP86xx/SMP87xx Watchdog driver * * 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. */ #include #include #include #include #include #include #include #include #include #include #include #define DEFAULT_TIMEOUT 30 static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); static unsigned int timeout; module_param(timeout, int, 0); MODULE_PARM_DESC(timeout, "Watchdog timeout"); /* * Counter counts down from programmed value. Reset asserts when * the counter reaches 1. */ #define WD_COUNTER 0 #define WD_CONFIG 4 #define WD_CONFIG_XTAL_IN BIT(0) #define WD_CONFIG_DISABLE BIT(31) struct tangox_wdt_device { struct watchdog_device wdt; void __iomem *base; unsigned long clk_rate; struct clk *clk; struct notifier_block restart; }; static int tangox_wdt_set_timeout(struct watchdog_device *wdt, unsigned int new_timeout) { wdt->timeout = new_timeout; return 0; } static int tangox_wdt_start(struct watchdog_device *wdt) { struct tangox_wdt_device *dev = watchdog_get_drvdata(wdt); u32 ticks; ticks = 1 + wdt->timeout * dev->clk_rate; writel(ticks, dev->base + WD_COUNTER); return 0; } static int tangox_wdt_stop(struct watchdog_device *wdt) { struct tangox_wdt_device *dev = watchdog_get_drvdata(wdt); writel(0, dev->base + WD_COUNTER); return 0; } static unsigned int tangox_wdt_get_timeleft(struct watchdog_device *wdt) { struct tangox_wdt_device *dev = watchdog_get_drvdata(wdt); u32 count; count = readl(dev->base + WD_COUNTER); if (!count) return 0; return (count - 1) / dev->clk_rate; } static const struct watchdog_info tangox_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .identity = "tangox watchdog", }; static const struct watchdog_ops tangox_wdt_ops = { .start = tangox_wdt_start, .stop = tangox_wdt_stop, .set_timeout = tangox_wdt_set_timeout, .get_timeleft = tangox_wdt_get_timeleft, }; static int tangox_wdt_restart(struct notifier_block *nb, unsigned long action, void *data) { struct tangox_wdt_device *dev = container_of(nb, struct tangox_wdt_device, restart); writel(1, dev->base + WD_COUNTER); return NOTIFY_DONE; } static int tangox_wdt_probe(struct platform_device *pdev) { struct tangox_wdt_device *dev; struct resource *res; u32 config; int err; dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); if (!dev) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); dev->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(dev->base)) return PTR_ERR(dev->base); dev->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(dev->clk)) return PTR_ERR(dev->clk); err = clk_prepare_enable(dev->clk); if (err) return err; dev->clk_rate = clk_get_rate(dev->clk); if (!dev->clk_rate) { err = -EINVAL; goto err; } dev->wdt.parent = &pdev->dev; dev->wdt.info = &tangox_wdt_info; dev->wdt.ops = &tangox_wdt_ops; dev->wdt.timeout = DEFAULT_TIMEOUT; dev->wdt.min_timeout = 1; dev->wdt.max_hw_heartbeat_ms = (U32_MAX - 1) / dev->clk_rate; watchdog_init_timeout(&dev->wdt, timeout, &pdev->dev); watchdog_set_nowayout(&dev->wdt, nowayout); watchdog_set_drvdata(&dev->wdt, dev); /* * Deactivate counter if disable bit is set to avoid * accidental reset. */ config = readl(dev->base + WD_CONFIG); if (config & WD_CONFIG_DISABLE) writel(0, dev->base + WD_COUNTER); writel(WD_CONFIG_XTAL_IN, dev->base + WD_CONFIG); /* * Mark as active and restart with configured timeout if * already running. */ if (readl(dev->base + WD_COUNTER)) { set_bit(WDOG_HW_RUNNING, &dev->wdt.status); tangox_wdt_start(&dev->wdt); } err = watchdog_register_device(&dev->wdt); if (err) goto err; platform_set_drvdata(pdev, dev); dev->restart.notifier_call = tangox_wdt_restart; dev->restart.priority = 128; err = register_restart_handler(&dev->restart); if (err) dev_warn(&pdev->dev, "failed to register restart handler\n"); dev_info(&pdev->dev, "SMP86xx/SMP87xx watchdog registered\n"); return 0; err: clk_disable_unprepare(dev->clk); return err; } static int tangox_wdt_remove(struct platform_device *pdev) { struct tangox_wdt_device *dev = platform_get_drvdata(pdev); tangox_wdt_stop(&dev->wdt); clk_disable_unprepare(dev->clk); unregister_restart_handler(&dev->restart); watchdog_unregister_device(&dev->wdt); return 0; } static const struct of_device_id tangox_wdt_dt_ids[] = { { .compatible = "sigma,smp8642-wdt" }, { .compatible = "sigma,smp8759-wdt" }, { } }; MODULE_DEVICE_TABLE(of, tangox_wdt_dt_ids); static struct platform_driver tangox_wdt_driver = { .probe = tangox_wdt_probe, .remove = tangox_wdt_remove, .driver = { .name = "tangox-wdt", .of_match_table = tangox_wdt_dt_ids, }, }; module_platform_driver(tangox_wdt_driver); MODULE_AUTHOR("Mans Rullgard "); MODULE_DESCRIPTION("SMP86xx/SMP87xx Watchdog driver"); MODULE_LICENSE("GPL"); cgit.cgi/linux/net-next.git/tree/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>d53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/ipv6/netfilter/nft_chain_route_ipv6.c parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/ipv6/netfilter/nft_chain_route_ipv6.c')