s390/watchdog: use watchdog API
Converted the vmwatchdog driver to use the kernel's watchdog API. Signed-off-by: Philipp Hachtmann <phacht@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Philipp Hachtmann
Martin Schwidefsky
Родитель
f2485f5d1c
Коммит
f7a94db4e9
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@ -456,6 +456,7 @@ CONFIG_TN3270_FS=y
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CONFIG_WATCHDOG=y
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CONFIG_WATCHDOG=y
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CONFIG_WATCHDOG_NOWAYOUT=y
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CONFIG_WATCHDOG_NOWAYOUT=y
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CONFIG_SOFT_WATCHDOG=m
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CONFIG_SOFT_WATCHDOG=m
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CONFIG_DIAG288_WATCHDOG=m
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# CONFIG_HID is not set
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# CONFIG_HID is not set
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# CONFIG_USB_SUPPORT is not set
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# CONFIG_USB_SUPPORT is not set
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CONFIG_INFINIBAND=m
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CONFIG_INFINIBAND=m
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@ -453,6 +453,7 @@ CONFIG_TN3270_FS=y
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CONFIG_WATCHDOG=y
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CONFIG_WATCHDOG=y
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CONFIG_WATCHDOG_NOWAYOUT=y
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CONFIG_WATCHDOG_NOWAYOUT=y
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CONFIG_SOFT_WATCHDOG=m
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CONFIG_SOFT_WATCHDOG=m
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CONFIG_DIAG288_WATCHDOG=m
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# CONFIG_HID is not set
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# CONFIG_HID is not set
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# CONFIG_USB_SUPPORT is not set
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# CONFIG_USB_SUPPORT is not set
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CONFIG_INFINIBAND=m
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CONFIG_INFINIBAND=m
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@ -451,6 +451,7 @@ CONFIG_TN3270_FS=y
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CONFIG_WATCHDOG=y
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CONFIG_WATCHDOG=y
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CONFIG_WATCHDOG_NOWAYOUT=y
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CONFIG_WATCHDOG_NOWAYOUT=y
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CONFIG_SOFT_WATCHDOG=m
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CONFIG_SOFT_WATCHDOG=m
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CONFIG_DIAG288_WATCHDOG=m
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# CONFIG_HID is not set
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# CONFIG_HID is not set
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# CONFIG_USB_SUPPORT is not set
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# CONFIG_USB_SUPPORT is not set
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CONFIG_INFINIBAND=m
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CONFIG_INFINIBAND=m
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@ -19,7 +19,6 @@ obj-$(CONFIG_SCLP_VT220_TTY) += sclp_vt220.o
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obj-$(CONFIG_SCLP_CPI) += sclp_cpi.o
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obj-$(CONFIG_SCLP_CPI) += sclp_cpi.o
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obj-$(CONFIG_SCLP_ASYNC) += sclp_async.o
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obj-$(CONFIG_SCLP_ASYNC) += sclp_async.o
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obj-$(CONFIG_ZVM_WATCHDOG) += vmwatchdog.o
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obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o
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obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o
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obj-$(CONFIG_VMCP) += vmcp.o
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obj-$(CONFIG_VMCP) += vmcp.o
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@ -1,338 +0,0 @@
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/*
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* Watchdog implementation based on z/VM Watchdog Timer API
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*
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* Copyright IBM Corp. 2004, 2009
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*
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* The user space watchdog daemon can use this driver as
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* /dev/vmwatchdog to have z/VM execute the specified CP
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* command when the timeout expires. The default command is
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* "IPL", which which cause an immediate reboot.
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*/
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#define KMSG_COMPONENT "vmwatchdog"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/suspend.h>
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#include <linux/watchdog.h>
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#include <asm/ebcdic.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#define MAX_CMDLEN 240
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#define MIN_INTERVAL 15
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static char vmwdt_cmd[MAX_CMDLEN] = "IPL";
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static bool vmwdt_conceal;
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static bool vmwdt_nowayout = WATCHDOG_NOWAYOUT;
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
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MODULE_DESCRIPTION("z/VM Watchdog Timer");
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module_param_string(cmd, vmwdt_cmd, MAX_CMDLEN, 0644);
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MODULE_PARM_DESC(cmd, "CP command that is run when the watchdog triggers");
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module_param_named(conceal, vmwdt_conceal, bool, 0644);
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MODULE_PARM_DESC(conceal, "Enable the CONCEAL CP option while the watchdog "
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" is active");
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module_param_named(nowayout, vmwdt_nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"
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" (default=CONFIG_WATCHDOG_NOWAYOUT)");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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static unsigned int vmwdt_interval = 60;
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static unsigned long vmwdt_is_open;
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static int vmwdt_expect_close;
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static DEFINE_MUTEX(vmwdt_mutex);
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#define VMWDT_OPEN 0 /* devnode is open or suspend in progress */
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#define VMWDT_RUNNING 1 /* The watchdog is armed */
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enum vmwdt_func {
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/* function codes */
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wdt_init = 0,
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wdt_change = 1,
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wdt_cancel = 2,
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/* flags */
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wdt_conceal = 0x80000000,
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};
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static int __diag288(enum vmwdt_func func, unsigned int timeout,
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char *cmd, size_t len)
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{
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register unsigned long __func asm("2") = func;
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register unsigned long __timeout asm("3") = timeout;
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register unsigned long __cmdp asm("4") = virt_to_phys(cmd);
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register unsigned long __cmdl asm("5") = len;
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int err;
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err = -EINVAL;
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asm volatile(
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" diag %1,%3,0x288\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+d" (err) : "d"(__func), "d"(__timeout),
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"d"(__cmdp), "d"(__cmdl) : "1", "cc");
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return err;
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}
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static int vmwdt_keepalive(void)
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{
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/* we allocate new memory every time to avoid having
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* to track the state. static allocation is not an
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* option since that might not be contiguous in real
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* storage in case of a modular build */
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static char *ebc_cmd;
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size_t len;
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int ret;
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unsigned int func;
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ebc_cmd = kmalloc(MAX_CMDLEN, GFP_KERNEL);
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if (!ebc_cmd)
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return -ENOMEM;
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len = strlcpy(ebc_cmd, vmwdt_cmd, MAX_CMDLEN);
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ASCEBC(ebc_cmd, MAX_CMDLEN);
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EBC_TOUPPER(ebc_cmd, MAX_CMDLEN);
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func = vmwdt_conceal ? (wdt_init | wdt_conceal) : wdt_init;
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set_bit(VMWDT_RUNNING, &vmwdt_is_open);
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ret = __diag288(func, vmwdt_interval, ebc_cmd, len);
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WARN_ON(ret != 0);
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kfree(ebc_cmd);
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return ret;
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}
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static int vmwdt_disable(void)
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{
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char cmd[] = {'\0'};
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int ret = __diag288(wdt_cancel, 0, cmd, 0);
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WARN_ON(ret != 0);
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clear_bit(VMWDT_RUNNING, &vmwdt_is_open);
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return ret;
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}
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static int __init vmwdt_probe(void)
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{
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/* there is no real way to see if the watchdog is supported,
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* so we try initializing it with a NOP command ("BEGIN")
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* that won't cause any harm even if the following disable
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* fails for some reason */
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char ebc_begin[] = {
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194, 197, 199, 201, 213
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};
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if (__diag288(wdt_init, 15, ebc_begin, sizeof(ebc_begin)) != 0)
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return -EINVAL;
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return vmwdt_disable();
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}
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static int vmwdt_open(struct inode *i, struct file *f)
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{
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int ret;
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if (test_and_set_bit(VMWDT_OPEN, &vmwdt_is_open))
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return -EBUSY;
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ret = vmwdt_keepalive();
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if (ret)
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clear_bit(VMWDT_OPEN, &vmwdt_is_open);
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return ret ? ret : nonseekable_open(i, f);
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}
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static int vmwdt_close(struct inode *i, struct file *f)
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{
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if (vmwdt_expect_close == 42)
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vmwdt_disable();
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vmwdt_expect_close = 0;
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clear_bit(VMWDT_OPEN, &vmwdt_is_open);
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return 0;
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}
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static struct watchdog_info vmwdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.firmware_version = 0,
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.identity = "z/VM Watchdog Timer",
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};
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static int __vmwdt_ioctl(unsigned int cmd, unsigned long arg)
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{
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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if (copy_to_user((void __user *)arg, &vmwdt_info,
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sizeof(vmwdt_info)))
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return -EFAULT;
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return 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, (int __user *)arg);
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case WDIOC_GETTEMP:
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return -EINVAL;
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case WDIOC_SETOPTIONS:
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{
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int options, ret;
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if (get_user(options, (int __user *)arg))
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return -EFAULT;
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ret = -EINVAL;
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if (options & WDIOS_DISABLECARD) {
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ret = vmwdt_disable();
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if (ret)
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return ret;
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}
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if (options & WDIOS_ENABLECARD) {
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ret = vmwdt_keepalive();
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}
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return ret;
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}
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case WDIOC_GETTIMEOUT:
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return put_user(vmwdt_interval, (int __user *)arg);
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case WDIOC_SETTIMEOUT:
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{
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int interval;
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if (get_user(interval, (int __user *)arg))
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return -EFAULT;
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if (interval < MIN_INTERVAL)
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return -EINVAL;
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vmwdt_interval = interval;
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}
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return vmwdt_keepalive();
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case WDIOC_KEEPALIVE:
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return vmwdt_keepalive();
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}
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return -EINVAL;
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}
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static long vmwdt_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
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{
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int rc;
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mutex_lock(&vmwdt_mutex);
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rc = __vmwdt_ioctl(cmd, arg);
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mutex_unlock(&vmwdt_mutex);
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return (long) rc;
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}
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static ssize_t vmwdt_write(struct file *f, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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if(count) {
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if (!vmwdt_nowayout) {
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size_t i;
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/* note: just in case someone wrote the magic character
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* five months ago... */
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vmwdt_expect_close = 0;
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for (i = 0; i != count; i++) {
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char c;
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if (get_user(c, buf+i))
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return -EFAULT;
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if (c == 'V')
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vmwdt_expect_close = 42;
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}
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}
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/* someone wrote to us, we should restart timer */
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vmwdt_keepalive();
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}
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return count;
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}
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static int vmwdt_resume(void)
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{
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clear_bit(VMWDT_OPEN, &vmwdt_is_open);
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return NOTIFY_DONE;
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}
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/*
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* It makes no sense to go into suspend while the watchdog is running.
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* Depending on the memory size, the watchdog might trigger, while we
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* are still saving the memory.
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* We reuse the open flag to ensure that suspend and watchdog open are
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* exclusive operations
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*/
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static int vmwdt_suspend(void)
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{
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if (test_and_set_bit(VMWDT_OPEN, &vmwdt_is_open)) {
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pr_err("The system cannot be suspended while the watchdog"
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" is in use\n");
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return notifier_from_errno(-EBUSY);
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}
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if (test_bit(VMWDT_RUNNING, &vmwdt_is_open)) {
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clear_bit(VMWDT_OPEN, &vmwdt_is_open);
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pr_err("The system cannot be suspended while the watchdog"
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" is running\n");
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return notifier_from_errno(-EBUSY);
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}
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return NOTIFY_DONE;
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}
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/*
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* This function is called for suspend and resume.
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*/
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static int vmwdt_power_event(struct notifier_block *this, unsigned long event,
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void *ptr)
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{
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switch (event) {
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case PM_POST_HIBERNATION:
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case PM_POST_SUSPEND:
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return vmwdt_resume();
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case PM_HIBERNATION_PREPARE:
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case PM_SUSPEND_PREPARE:
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return vmwdt_suspend();
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default:
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return NOTIFY_DONE;
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}
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}
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static struct notifier_block vmwdt_power_notifier = {
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.notifier_call = vmwdt_power_event,
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};
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static const struct file_operations vmwdt_fops = {
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.open = &vmwdt_open,
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.release = &vmwdt_close,
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.unlocked_ioctl = &vmwdt_ioctl,
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.write = &vmwdt_write,
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.owner = THIS_MODULE,
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.llseek = noop_llseek,
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};
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static struct miscdevice vmwdt_dev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &vmwdt_fops,
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};
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static int __init vmwdt_init(void)
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{
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int ret;
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ret = vmwdt_probe();
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if (ret)
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return ret;
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ret = register_pm_notifier(&vmwdt_power_notifier);
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if (ret)
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return ret;
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/*
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* misc_register() has to be the last action in module_init(), because
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* file operations will be available right after this.
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*/
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ret = misc_register(&vmwdt_dev);
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if (ret) {
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unregister_pm_notifier(&vmwdt_power_notifier);
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return ret;
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}
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return 0;
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|
||||||
}
|
|
||||||
module_init(vmwdt_init);
|
|
||||||
|
|
||||||
static void __exit vmwdt_exit(void)
|
|
||||||
{
|
|
||||||
unregister_pm_notifier(&vmwdt_power_notifier);
|
|
||||||
misc_deregister(&vmwdt_dev);
|
|
||||||
}
|
|
||||||
module_exit(vmwdt_exit);
|
|
||||||
|
|
@ -1295,9 +1295,10 @@ config WATCHDOG_RTAS
|
||||||
|
|
||||||
# S390 Architecture
|
# S390 Architecture
|
||||||
|
|
||||||
config ZVM_WATCHDOG
|
config DIAG288_WATCHDOG
|
||||||
tristate "z/VM Watchdog Timer"
|
tristate "System z diag288 Watchdog"
|
||||||
depends on S390
|
depends on S390
|
||||||
|
select WATCHDOG_CORE
|
||||||
help
|
help
|
||||||
IBM s/390 and zSeries machines running under z/VM 5.1 or later
|
IBM s/390 and zSeries machines running under z/VM 5.1 or later
|
||||||
provide a virtual watchdog timer to their guest that cause a
|
provide a virtual watchdog timer to their guest that cause a
|
||||||
|
|
|
||||||
|
|
@ -154,6 +154,7 @@ obj-$(CONFIG_MEN_A21_WDT) += mena21_wdt.o
|
||||||
obj-$(CONFIG_WATCHDOG_RTAS) += wdrtas.o
|
obj-$(CONFIG_WATCHDOG_RTAS) += wdrtas.o
|
||||||
|
|
||||||
# S390 Architecture
|
# S390 Architecture
|
||||||
|
obj-$(CONFIG_DIAG288_WATCHDOG) += diag288_wdt.o
|
||||||
|
|
||||||
# SUPERH (sh + sh64) Architecture
|
# SUPERH (sh + sh64) Architecture
|
||||||
obj-$(CONFIG_SH_WDT) += shwdt.o
|
obj-$(CONFIG_SH_WDT) += shwdt.o
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,287 @@
|
||||||
|
/*
|
||||||
|
* Watchdog driver for z/VM using the diag 288 interface.
|
||||||
|
*
|
||||||
|
* Under z/VM, expiration of the watchdog will send a "system restart" command
|
||||||
|
* to CP.
|
||||||
|
*
|
||||||
|
* The command can be altered using the module parameter "cmd".
|
||||||
|
*
|
||||||
|
* Copyright IBM Corp. 2004, 2013
|
||||||
|
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
|
||||||
|
* Philipp Hachtmann (phacht@de.ibm.com)
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
#define KMSG_COMPONENT "diag288_wdt"
|
||||||
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
||||||
|
|
||||||
|
#include <linux/init.h>
|
||||||
|
#include <linux/kernel.h>
|
||||||
|
#include <linux/module.h>
|
||||||
|
#include <linux/moduleparam.h>
|
||||||
|
#include <linux/slab.h>
|
||||||
|
#include <linux/miscdevice.h>
|
||||||
|
#include <linux/watchdog.h>
|
||||||
|
#include <linux/suspend.h>
|
||||||
|
#include <asm/ebcdic.h>
|
||||||
|
#include <linux/io.h>
|
||||||
|
#include <linux/uaccess.h>
|
||||||
|
|
||||||
|
#define MAX_CMDLEN 240
|
||||||
|
#define DEFAULT_CMD "SYSTEM RESTART"
|
||||||
|
|
||||||
|
#define MIN_INTERVAL 15 /* Minimal time supported by diag88 */
|
||||||
|
#define MAX_INTERVAL 3600 /* One hour should be enough - pure estimation */
|
||||||
|
|
||||||
|
#define WDT_DEFAULT_TIMEOUT 30
|
||||||
|
|
||||||
|
/* Function codes - init, change, cancel */
|
||||||
|
#define WDT_FUNC_INIT 0
|
||||||
|
#define WDT_FUNC_CHANGE 1
|
||||||
|
#define WDT_FUNC_CANCEL 2
|
||||||
|
#define WDT_FUNC_CONCEAL 0x80000000
|
||||||
|
|
||||||
|
static char wdt_cmd[MAX_CMDLEN] = DEFAULT_CMD;
|
||||||
|
static bool conceal_on;
|
||||||
|
static bool nowayout_info = WATCHDOG_NOWAYOUT;
|
||||||
|
|
||||||
|
MODULE_LICENSE("GPL");
|
||||||
|
MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
|
||||||
|
MODULE_AUTHOR("Philipp Hachtmann <phacht@de.ibm.com>");
|
||||||
|
|
||||||
|
MODULE_DESCRIPTION("System z diag288 Watchdog Timer");
|
||||||
|
|
||||||
|
module_param_string(cmd, wdt_cmd, MAX_CMDLEN, 0644);
|
||||||
|
MODULE_PARM_DESC(cmd, "CP command that is run when the watchdog triggers (z/VM only)");
|
||||||
|
|
||||||
|
module_param_named(conceal, conceal_on, bool, 0644);
|
||||||
|
MODULE_PARM_DESC(conceal, "Enable the CONCEAL CP option while the watchdog is active (z/VM only)");
|
||||||
|
|
||||||
|
module_param_named(nowayout, nowayout_info, bool, 0444);
|
||||||
|
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default = CONFIG_WATCHDOG_NOWAYOUT)");
|
||||||
|
|
||||||
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||||
|
MODULE_ALIAS("vmwatchdog");
|
||||||
|
|
||||||
|
static int __diag288(unsigned int func, unsigned int timeout,
|
||||||
|
unsigned long action, unsigned int len)
|
||||||
|
{
|
||||||
|
register unsigned long __func asm("2") = func;
|
||||||
|
register unsigned long __timeout asm("3") = timeout;
|
||||||
|
register unsigned long __action asm("4") = action;
|
||||||
|
register unsigned long __len asm("5") = len;
|
||||||
|
int err;
|
||||||
|
|
||||||
|
err = -EINVAL;
|
||||||
|
asm volatile(
|
||||||
|
" diag %1, %3, 0x288\n"
|
||||||
|
"0: la %0, 0\n"
|
||||||
|
"1:\n"
|
||||||
|
EX_TABLE(0b, 1b)
|
||||||
|
: "+d" (err) : "d"(__func), "d"(__timeout),
|
||||||
|
"d"(__action), "d"(__len) : "1", "cc");
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int __diag288_vm(unsigned int func, unsigned int timeout,
|
||||||
|
char *cmd, size_t len)
|
||||||
|
{
|
||||||
|
return __diag288(func, timeout, virt_to_phys(cmd), len);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int wdt_start(struct watchdog_device *dev)
|
||||||
|
{
|
||||||
|
char *ebc_cmd;
|
||||||
|
size_t len;
|
||||||
|
int ret;
|
||||||
|
unsigned int func;
|
||||||
|
|
||||||
|
ret = -ENODEV;
|
||||||
|
|
||||||
|
if (MACHINE_IS_VM) {
|
||||||
|
ebc_cmd = kmalloc(MAX_CMDLEN, GFP_KERNEL);
|
||||||
|
if (!ebc_cmd)
|
||||||
|
return -ENOMEM;
|
||||||
|
len = strlcpy(ebc_cmd, wdt_cmd, MAX_CMDLEN);
|
||||||
|
ASCEBC(ebc_cmd, MAX_CMDLEN);
|
||||||
|
EBC_TOUPPER(ebc_cmd, MAX_CMDLEN);
|
||||||
|
|
||||||
|
func = conceal_on ? (WDT_FUNC_INIT | WDT_FUNC_CONCEAL)
|
||||||
|
: WDT_FUNC_INIT;
|
||||||
|
ret = __diag288_vm(func, dev->timeout, ebc_cmd, len);
|
||||||
|
WARN_ON(ret != 0);
|
||||||
|
kfree(ebc_cmd);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (ret) {
|
||||||
|
pr_err("The watchdog cannot be activated\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
pr_info("The watchdog was activated\n");
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int wdt_stop(struct watchdog_device *dev)
|
||||||
|
{
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
ret = __diag288(WDT_FUNC_CANCEL, 0, 0, 0);
|
||||||
|
pr_info("The watchdog was deactivated\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int wdt_ping(struct watchdog_device *dev)
|
||||||
|
{
|
||||||
|
char *ebc_cmd;
|
||||||
|
size_t len;
|
||||||
|
int ret;
|
||||||
|
unsigned int func;
|
||||||
|
|
||||||
|
ret = -ENODEV;
|
||||||
|
|
||||||
|
if (MACHINE_IS_VM) {
|
||||||
|
ebc_cmd = kmalloc(MAX_CMDLEN, GFP_KERNEL);
|
||||||
|
if (!ebc_cmd)
|
||||||
|
return -ENOMEM;
|
||||||
|
len = strlcpy(ebc_cmd, wdt_cmd, MAX_CMDLEN);
|
||||||
|
ASCEBC(ebc_cmd, MAX_CMDLEN);
|
||||||
|
EBC_TOUPPER(ebc_cmd, MAX_CMDLEN);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* It seems to be ok to z/VM to use the init function to
|
||||||
|
* retrigger the watchdog.
|
||||||
|
*/
|
||||||
|
func = conceal_on ? (WDT_FUNC_INIT | WDT_FUNC_CONCEAL)
|
||||||
|
: WDT_FUNC_INIT;
|
||||||
|
|
||||||
|
ret = __diag288_vm(func, dev->timeout, ebc_cmd, len);
|
||||||
|
WARN_ON(ret != 0);
|
||||||
|
kfree(ebc_cmd);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (ret)
|
||||||
|
pr_err("The watchdog timer cannot be started or reset\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int wdt_set_timeout(struct watchdog_device * dev, unsigned int new_to)
|
||||||
|
{
|
||||||
|
dev->timeout = new_to;
|
||||||
|
return wdt_ping(dev);
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct watchdog_ops wdt_ops = {
|
||||||
|
.owner = THIS_MODULE,
|
||||||
|
.start = wdt_start,
|
||||||
|
.stop = wdt_stop,
|
||||||
|
.ping = wdt_ping,
|
||||||
|
.set_timeout = wdt_set_timeout,
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct watchdog_info wdt_info = {
|
||||||
|
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
|
||||||
|
.firmware_version = 0,
|
||||||
|
.identity = "z Watchdog",
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct watchdog_device wdt_dev = {
|
||||||
|
.parent = NULL,
|
||||||
|
.info = &wdt_info,
|
||||||
|
.ops = &wdt_ops,
|
||||||
|
.bootstatus = 0,
|
||||||
|
.timeout = WDT_DEFAULT_TIMEOUT,
|
||||||
|
.min_timeout = MIN_INTERVAL,
|
||||||
|
.max_timeout = MAX_INTERVAL,
|
||||||
|
};
|
||||||
|
|
||||||
|
/*
|
||||||
|
* It makes no sense to go into suspend while the watchdog is running.
|
||||||
|
* Depending on the memory size, the watchdog might trigger, while we
|
||||||
|
* are still saving the memory.
|
||||||
|
* We reuse the open flag to ensure that suspend and watchdog open are
|
||||||
|
* exclusive operations
|
||||||
|
*/
|
||||||
|
static int wdt_suspend(void)
|
||||||
|
{
|
||||||
|
if (test_and_set_bit(WDOG_DEV_OPEN, &wdt_dev.status)) {
|
||||||
|
pr_err("Linux cannot be suspended while the watchdog is in use\n");
|
||||||
|
return notifier_from_errno(-EBUSY);
|
||||||
|
}
|
||||||
|
if (test_bit(WDOG_ACTIVE, &wdt_dev.status)) {
|
||||||
|
clear_bit(WDOG_DEV_OPEN, &wdt_dev.status);
|
||||||
|
pr_err("Linux cannot be suspended while the watchdog is in use\n");
|
||||||
|
return notifier_from_errno(-EBUSY);
|
||||||
|
}
|
||||||
|
return NOTIFY_DONE;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int wdt_resume(void)
|
||||||
|
{
|
||||||
|
clear_bit(WDOG_DEV_OPEN, &wdt_dev.status);
|
||||||
|
return NOTIFY_DONE;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int wdt_power_event(struct notifier_block *this, unsigned long event,
|
||||||
|
void *ptr)
|
||||||
|
{
|
||||||
|
switch (event) {
|
||||||
|
case PM_POST_HIBERNATION:
|
||||||
|
case PM_POST_SUSPEND:
|
||||||
|
return wdt_resume();
|
||||||
|
case PM_HIBERNATION_PREPARE:
|
||||||
|
case PM_SUSPEND_PREPARE:
|
||||||
|
return wdt_suspend();
|
||||||
|
default:
|
||||||
|
return NOTIFY_DONE;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct notifier_block wdt_power_notifier = {
|
||||||
|
.notifier_call = wdt_power_event,
|
||||||
|
};
|
||||||
|
|
||||||
|
static int __init diag288_init(void)
|
||||||
|
{
|
||||||
|
int ret;
|
||||||
|
char ebc_begin[] = {
|
||||||
|
194, 197, 199, 201, 213
|
||||||
|
};
|
||||||
|
|
||||||
|
watchdog_set_nowayout(&wdt_dev, nowayout_info);
|
||||||
|
|
||||||
|
if (MACHINE_IS_VM) {
|
||||||
|
pr_info("The watchdog device driver detected a z/VM environment\n");
|
||||||
|
if (__diag288_vm(WDT_FUNC_INIT, 15,
|
||||||
|
ebc_begin, sizeof(ebc_begin)) != 0) {
|
||||||
|
pr_err("The watchdog cannot be initialized\n");
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
pr_err("Linux runs in an environment that does not support the diag288 watchdog\n");
|
||||||
|
return -ENODEV;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (__diag288_vm(WDT_FUNC_CANCEL, 0, NULL, 0)) {
|
||||||
|
pr_err("The watchdog cannot be deactivated\n");
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = register_pm_notifier(&wdt_power_notifier);
|
||||||
|
if (ret)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
ret = watchdog_register_device(&wdt_dev);
|
||||||
|
if (ret)
|
||||||
|
unregister_pm_notifier(&wdt_power_notifier);
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void __exit diag288_exit(void)
|
||||||
|
{
|
||||||
|
watchdog_unregister_device(&wdt_dev);
|
||||||
|
unregister_pm_notifier(&wdt_power_notifier);
|
||||||
|
}
|
||||||
|
|
||||||
|
module_init(diag288_init);
|
||||||
|
module_exit(diag288_exit);
|
||||||
Загрузка…
Ссылка в новой задаче