修改内核路径

hc

2024-05-14 bedbef8ad3e75a304af6361af235302bcc61d06b

 kernel/drivers/watchdog/wdat_wdt.c
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@@ -1,12 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * ACPI Hardware Watchdog (WDAT) driver.
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  *
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  * Copyright (C) 2016, Intel Corporation
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  * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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8
 
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 #include <linux/acpi.h>
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@@ -56,6 +53,13 @@
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 module_param(nowayout, bool, 0);
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 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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 		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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+
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+#define WDAT_DEFAULT_TIMEOUT	30
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+
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+static int timeout = WDAT_DEFAULT_TIMEOUT;
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+module_param(timeout, int, 0);
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+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
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+		 __MODULE_STRING(WDAT_DEFAULT_TIMEOUT) ")");
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63
 
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 static int wdat_wdt_read(struct wdat_wdt *wdat,
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 	 const struct wdat_instruction *instr, u32 *value)
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@@ -205,7 +209,7 @@
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 	 * WDAT specification says that the watchdog is required to reboot
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 	 * the system when it fires. However, it also states that it is
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 	 * recommeded to make it configurable through hardware register. We
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-	 * enable reboot now if it is configrable, just in case.
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+	 * enable reboot now if it is configurable, just in case.
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 	 */
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 	ret = wdat_wdt_run_action(wdat, ACPI_WDAT_SET_REBOOT, 0, NULL);
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 	if (ret && ret != -EOPNOTSUPP) {
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@@ -287,7 +291,7 @@
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 	struct wdat_wdt *wdat = to_wdat_wdt(wdd);
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 	u32 periods = 0;
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-	wdat_wdt_run_action(wdat, ACPI_WDAT_GET_COUNTDOWN, 0, &periods);
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+	wdat_wdt_run_action(wdat, ACPI_WDAT_GET_CURRENT_COUNTDOWN, 0, &periods);
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 	return periods * wdat->period / 1000;
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 }
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@@ -308,6 +312,7 @@
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 static int wdat_wdt_probe(struct platform_device *pdev)
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 {
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+	struct device *dev = &pdev->dev;
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 	const struct acpi_wdat_entry *entries;
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 	const struct acpi_table_wdat *tbl;
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 	struct wdat_wdt *wdat;
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@@ -321,11 +326,11 @@
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 	if (ACPI_FAILURE(status))
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 		return -ENODEV;
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-	wdat = devm_kzalloc(&pdev->dev, sizeof(*wdat), GFP_KERNEL);
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+	wdat = devm_kzalloc(dev, sizeof(*wdat), GFP_KERNEL);
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 	if (!wdat)
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 		return -ENOMEM;
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-	regs = devm_kcalloc(&pdev->dev, pdev->num_resources, sizeof(*regs),
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+	regs = devm_kcalloc(dev, pdev->num_resources, sizeof(*regs),
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 			    GFP_KERNEL);
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 	if (!regs)
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 		return -ENOMEM;
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@@ -350,15 +355,15 @@
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 		res = &pdev->resource[i];
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 		if (resource_type(res) == IORESOURCE_MEM) {
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-			reg = devm_ioremap_resource(&pdev->dev, res);
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+			reg = devm_ioremap_resource(dev, res);
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 			if (IS_ERR(reg))
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 				return PTR_ERR(reg);
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 		} else if (resource_type(res) == IORESOURCE_IO) {
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-			reg = devm_ioport_map(&pdev->dev, res->start, 1);
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+			reg = devm_ioport_map(dev, res->start, 1);
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 			if (!reg)
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 				return -ENOMEM;
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 		} else {
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-			dev_err(&pdev->dev, "Unsupported resource\n");
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+			dev_err(dev, "Unsupported resource\n");
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 			return -EINVAL;
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 		}
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@@ -376,12 +381,11 @@
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 		action = entries[i].action;
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 		if (action >= MAX_WDAT_ACTIONS) {
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-			dev_dbg(&pdev->dev, "Skipping unknown action: %u\n",
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-				action);
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+			dev_dbg(dev, "Skipping unknown action: %u\n", action);
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 			continue;
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 		}
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-		instr = devm_kzalloc(&pdev->dev, sizeof(*instr), GFP_KERNEL);
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+		instr = devm_kzalloc(dev, sizeof(*instr), GFP_KERNEL);
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 		if (!instr)
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 			return -ENOMEM;
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@@ -398,7 +402,7 @@
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 		} else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
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 			r.flags = IORESOURCE_IO;
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 		} else {
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-			dev_dbg(&pdev->dev, "Unsupported address space: %d\n",
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+			dev_dbg(dev, "Unsupported address space: %d\n",
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 				gas->space_id);
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 			continue;
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 		}
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@@ -413,14 +417,15 @@
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 		}
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 		if (!instr->reg) {
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-			dev_err(&pdev->dev, "I/O resource not found\n");
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+			dev_err(dev, "I/O resource not found\n");
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 			return -EINVAL;
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 		}
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 		instructions = wdat->instructions[action];
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 		if (!instructions) {
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-			instructions = devm_kzalloc(&pdev->dev,
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-					sizeof(*instructions), GFP_KERNEL);
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+			instructions = devm_kzalloc(dev,
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+						    sizeof(*instructions),
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+						    GFP_KERNEL);
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 			if (!instructions)
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 				return -ENOMEM;
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@@ -440,8 +445,25 @@
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 	platform_set_drvdata(pdev, wdat);
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+	/*
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+	 * Set initial timeout so that userspace has time to configure the
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+	 * watchdog properly after it has opened the device. In some cases
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+	 * the BIOS default is too short and causes immediate reboot.
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+	 */
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+	if (timeout * 1000 < wdat->wdd.min_hw_heartbeat_ms ||
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+	    timeout * 1000 > wdat->wdd.max_hw_heartbeat_ms) {
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+		dev_warn(dev, "Invalid timeout %d given, using %d\n",
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+			 timeout, WDAT_DEFAULT_TIMEOUT);
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+		timeout = WDAT_DEFAULT_TIMEOUT;
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+	}
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+
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+	ret = wdat_wdt_set_timeout(&wdat->wdd, timeout);
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+	if (ret)
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+		return ret;
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+
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 	watchdog_set_nowayout(&wdat->wdd, nowayout);
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-	return devm_watchdog_register_device(&pdev->dev, &wdat->wdd);
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+	watchdog_stop_on_reboot(&wdat->wdd);
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+	return devm_watchdog_register_device(dev, &wdat->wdd);
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 }
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 #ifdef CONFIG_PM_SLEEP