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Declare watchdog_ops structures as const as they are only stored in the ops field of a watchdog_device structure. This field is of type const, so watchdog_ops structures having this property can be made const too. Done using Coccinelle: @r disable optional_qualifier@ identifier x; position p; @@ static struct watchdog_ops x@p={...}; @ok@ struct watchdog_device w; identifier r.x; position p; @@ w.ops=&x@p; @bad@ position p != {r.p,ok.p}; identifier r.x; @@ x@p @depends on !bad disable optional_qualifier@ identifier r.x; @@ +const struct watchdog_ops x; File size details before and after patching. First line of every .o file shows the file size before patching and second line shows the size after patching. text data bss dec hex filename 1340 544 0 1884 75c drivers/watchdog/bcm_kona_wdt.o 1436 440 0 1876 754 drivers/watchdog/bcm_kona_wdt.o 1176 544 4 1724 6bc drivers/watchdog/digicolor_wdt.o 1272 440 4 1716 6b4 drivers/watchdog/digicolor_wdt.o 925 580 89 1594 63a drivers/watchdog/ep93xx_wdt.o 1021 476 89 1586 632 drivers/watchdog/ep93xx_wdt.o 4932 288 17 5237 1475 drivers/watchdog/s3c2410_wdt.o 5028 192 17 5237 1475 drivers/watchdog/s3c2410_wdt.o 1977 292 1 2270 8de drivers/watchdog/sama5d4_wdt.o 2073 196 1 2270 8de drivers/watchdog/sama5d4_wdt.o 1375 484 1 1860 744 drivers/watchdog/sirfsoc_wdt.o 1471 380 1 1852 73c drivers/watchdog/sirfsoc_wdt.o Size remains the same for the files drivers/watchdog/diag288_wdt.o drivers/watchdog/asm9260_wdt.o and drivers/watchdog/atlas7_wdt.o The following .o files did not compile: drivers/watchdog/sun4v_wdt.o, drivers/watchdog/sbsa_gwdt.o, drivers/watchdog/rt2880_wdt.o, drivers/watchdog/booke_wdt.o drivers/watchdog/mt7621_wdt.o Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
192 lines
4.5 KiB
C
192 lines
4.5 KiB
C
/*
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* sun4v watchdog timer
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* (c) Copyright 2016 Oracle Corporation
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*
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* Implement a simple watchdog driver using the built-in sun4v hypervisor
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* watchdog support. If time expires, the hypervisor stops or bounces
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* the guest domain.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/watchdog.h>
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#include <asm/hypervisor.h>
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#include <asm/mdesc.h>
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#define WDT_TIMEOUT 60
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#define WDT_MAX_TIMEOUT 31536000
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#define WDT_MIN_TIMEOUT 1
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#define WDT_DEFAULT_RESOLUTION_MS 1000 /* 1 second */
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static unsigned int timeout;
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module_param(timeout, uint, 0);
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
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__MODULE_STRING(WDT_TIMEOUT) ")");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, S_IRUGO);
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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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static int sun4v_wdt_stop(struct watchdog_device *wdd)
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{
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sun4v_mach_set_watchdog(0, NULL);
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return 0;
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}
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static int sun4v_wdt_ping(struct watchdog_device *wdd)
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{
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int hverr;
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/*
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* HV watchdog timer will round up the timeout
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* passed in to the nearest multiple of the
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* watchdog resolution in milliseconds.
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*/
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hverr = sun4v_mach_set_watchdog(wdd->timeout * 1000, NULL);
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if (hverr == HV_EINVAL)
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return -EINVAL;
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return 0;
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}
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static int sun4v_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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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_info sun4v_wdt_ident = {
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.options = WDIOF_SETTIMEOUT |
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WDIOF_MAGICCLOSE |
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WDIOF_KEEPALIVEPING,
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.identity = "sun4v hypervisor watchdog",
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.firmware_version = 0,
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};
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static const struct watchdog_ops sun4v_wdt_ops = {
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.owner = THIS_MODULE,
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.start = sun4v_wdt_ping,
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.stop = sun4v_wdt_stop,
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.ping = sun4v_wdt_ping,
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.set_timeout = sun4v_wdt_set_timeout,
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};
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static struct watchdog_device wdd = {
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.info = &sun4v_wdt_ident,
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.ops = &sun4v_wdt_ops,
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.min_timeout = WDT_MIN_TIMEOUT,
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.max_timeout = WDT_MAX_TIMEOUT,
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.timeout = WDT_TIMEOUT,
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};
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static int __init sun4v_wdt_init(void)
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{
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struct mdesc_handle *handle;
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u64 node;
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const u64 *value;
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int err = 0;
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unsigned long major = 1, minor = 1;
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/*
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* There are 2 properties that can be set from the control
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* domain for the watchdog.
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* watchdog-resolution
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* watchdog-max-timeout
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*
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* We can expect a handle to be returned otherwise something
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* serious is wrong. Correct to return -ENODEV here.
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*/
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handle = mdesc_grab();
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if (!handle)
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return -ENODEV;
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node = mdesc_node_by_name(handle, MDESC_NODE_NULL, "platform");
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err = -ENODEV;
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if (node == MDESC_NODE_NULL)
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goto out_release;
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/*
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* This is a safe way to validate if we are on the right
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* platform.
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*/
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if (sun4v_hvapi_register(HV_GRP_CORE, major, &minor))
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goto out_hv_unreg;
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/* Allow value of watchdog-resolution up to 1s (default) */
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value = mdesc_get_property(handle, node, "watchdog-resolution", NULL);
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err = -EINVAL;
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if (value) {
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if (*value == 0 ||
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*value > WDT_DEFAULT_RESOLUTION_MS)
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goto out_hv_unreg;
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}
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value = mdesc_get_property(handle, node, "watchdog-max-timeout", NULL);
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if (value) {
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/*
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* If the property value (in ms) is smaller than
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* min_timeout, return -EINVAL.
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*/
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if (*value < wdd.min_timeout * 1000)
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goto out_hv_unreg;
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/*
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* If the property value is smaller than
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* default max_timeout then set watchdog max_timeout to
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* the value of the property in seconds.
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*/
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if (*value < wdd.max_timeout * 1000)
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wdd.max_timeout = *value / 1000;
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}
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watchdog_init_timeout(&wdd, timeout, NULL);
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watchdog_set_nowayout(&wdd, nowayout);
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err = watchdog_register_device(&wdd);
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if (err)
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goto out_hv_unreg;
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pr_info("initialized (timeout=%ds, nowayout=%d)\n",
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wdd.timeout, nowayout);
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mdesc_release(handle);
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return 0;
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out_hv_unreg:
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sun4v_hvapi_unregister(HV_GRP_CORE);
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out_release:
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mdesc_release(handle);
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return err;
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}
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static void __exit sun4v_wdt_exit(void)
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{
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sun4v_hvapi_unregister(HV_GRP_CORE);
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watchdog_unregister_device(&wdd);
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}
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module_init(sun4v_wdt_init);
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module_exit(sun4v_wdt_exit);
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MODULE_AUTHOR("Wim Coekaerts <wim.coekaerts@oracle.com>");
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MODULE_DESCRIPTION("sun4v watchdog driver");
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MODULE_LICENSE("GPL");
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