mirror of
https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
synced 2026-10-28 18:51:56 -04:00
s390/watchdog: use watchdog API
Converted the vmwatchdog driver to use the kernel's watchdog API. Signed-off-by: Philipp Hachtmann <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Philipp Hachtmann
Martin Schwidefsky
parent
f2485f5d1c
commit
f7a94db4e9
8 changed files with 294 additions and 341 deletions
|
|
@ -19,7 +19,6 @@ obj-$(CONFIG_SCLP_VT220_TTY) += sclp_vt220.o
|
|||
obj-$(CONFIG_SCLP_CPI) += sclp_cpi.o
|
||||
obj-$(CONFIG_SCLP_ASYNC) += sclp_async.o
|
||||
|
||||
obj-$(CONFIG_ZVM_WATCHDOG) += vmwatchdog.o
|
||||
obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o
|
||||
obj-$(CONFIG_VMCP) += vmcp.o
|
||||
|
||||
|
|
|
|||
|
|
@ -1,338 +0,0 @@
|
|||
/*
|
||||
* Watchdog implementation based on z/VM Watchdog Timer API
|
||||
*
|
||||
* Copyright IBM Corp. 2004, 2009
|
||||
*
|
||||
* The user space watchdog daemon can use this driver as
|
||||
* /dev/vmwatchdog to have z/VM execute the specified CP
|
||||
* command when the timeout expires. The default command is
|
||||
* "IPL", which which cause an immediate reboot.
|
||||
*/
|
||||
#define KMSG_COMPONENT "vmwatchdog"
|
||||
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/suspend.h>
|
||||
#include <linux/watchdog.h>
|
||||
|
||||
#include <asm/ebcdic.h>
|
||||
#include <asm/io.h>
|
||||
#include <asm/uaccess.h>
|
||||
|
||||
#define MAX_CMDLEN 240
|
||||
#define MIN_INTERVAL 15
|
||||
static char vmwdt_cmd[MAX_CMDLEN] = "IPL";
|
||||
static bool vmwdt_conceal;
|
||||
|
||||
static bool vmwdt_nowayout = WATCHDOG_NOWAYOUT;
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Arnd Bergmann <[email protected]>");
|
||||
MODULE_DESCRIPTION("z/VM Watchdog Timer");
|
||||
module_param_string(cmd, vmwdt_cmd, MAX_CMDLEN, 0644);
|
||||
MODULE_PARM_DESC(cmd, "CP command that is run when the watchdog triggers");
|
||||
module_param_named(conceal, vmwdt_conceal, bool, 0644);
|
||||
MODULE_PARM_DESC(conceal, "Enable the CONCEAL CP option while the watchdog "
|
||||
" is active");
|
||||
module_param_named(nowayout, vmwdt_nowayout, bool, 0);
|
||||
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"
|
||||
" (default=CONFIG_WATCHDOG_NOWAYOUT)");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
|
||||
static unsigned int vmwdt_interval = 60;
|
||||
static unsigned long vmwdt_is_open;
|
||||
static int vmwdt_expect_close;
|
||||
|
||||
static DEFINE_MUTEX(vmwdt_mutex);
|
||||
|
||||
#define VMWDT_OPEN 0 /* devnode is open or suspend in progress */
|
||||
#define VMWDT_RUNNING 1 /* The watchdog is armed */
|
||||
|
||||
enum vmwdt_func {
|
||||
/* function codes */
|
||||
wdt_init = 0,
|
||||
wdt_change = 1,
|
||||
wdt_cancel = 2,
|
||||
/* flags */
|
||||
wdt_conceal = 0x80000000,
|
||||
};
|
||||
|
||||
static int __diag288(enum vmwdt_func func, unsigned int timeout,
|
||||
char *cmd, size_t len)
|
||||
{
|
||||
register unsigned long __func asm("2") = func;
|
||||
register unsigned long __timeout asm("3") = timeout;
|
||||
register unsigned long __cmdp asm("4") = virt_to_phys(cmd);
|
||||
register unsigned long __cmdl 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"(__cmdp), "d"(__cmdl) : "1", "cc");
|
||||
return err;
|
||||
}
|
||||
|
||||
static int vmwdt_keepalive(void)
|
||||
{
|
||||
/* we allocate new memory every time to avoid having
|
||||
* to track the state. static allocation is not an
|
||||
* option since that might not be contiguous in real
|
||||
* storage in case of a modular build */
|
||||
static char *ebc_cmd;
|
||||
size_t len;
|
||||
int ret;
|
||||
unsigned int func;
|
||||
|
||||
ebc_cmd = kmalloc(MAX_CMDLEN, GFP_KERNEL);
|
||||
if (!ebc_cmd)
|
||||
return -ENOMEM;
|
||||
|
||||
len = strlcpy(ebc_cmd, vmwdt_cmd, MAX_CMDLEN);
|
||||
ASCEBC(ebc_cmd, MAX_CMDLEN);
|
||||
EBC_TOUPPER(ebc_cmd, MAX_CMDLEN);
|
||||
|
||||
func = vmwdt_conceal ? (wdt_init | wdt_conceal) : wdt_init;
|
||||
set_bit(VMWDT_RUNNING, &vmwdt_is_open);
|
||||
ret = __diag288(func, vmwdt_interval, ebc_cmd, len);
|
||||
WARN_ON(ret != 0);
|
||||
kfree(ebc_cmd);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int vmwdt_disable(void)
|
||||
{
|
||||
char cmd[] = {'\0'};
|
||||
int ret = __diag288(wdt_cancel, 0, cmd, 0);
|
||||
WARN_ON(ret != 0);
|
||||
clear_bit(VMWDT_RUNNING, &vmwdt_is_open);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __init vmwdt_probe(void)
|
||||
{
|
||||
/* there is no real way to see if the watchdog is supported,
|
||||
* so we try initializing it with a NOP command ("BEGIN")
|
||||
* that won't cause any harm even if the following disable
|
||||
* fails for some reason */
|
||||
char ebc_begin[] = {
|
||||
194, 197, 199, 201, 213
|
||||
};
|
||||
if (__diag288(wdt_init, 15, ebc_begin, sizeof(ebc_begin)) != 0)
|
||||
return -EINVAL;
|
||||
return vmwdt_disable();
|
||||
}
|
||||
|
||||
static int vmwdt_open(struct inode *i, struct file *f)
|
||||
{
|
||||
int ret;
|
||||
if (test_and_set_bit(VMWDT_OPEN, &vmwdt_is_open))
|
||||
return -EBUSY;
|
||||
ret = vmwdt_keepalive();
|
||||
if (ret)
|
||||
clear_bit(VMWDT_OPEN, &vmwdt_is_open);
|
||||
return ret ? ret : nonseekable_open(i, f);
|
||||
}
|
||||
|
||||
static int vmwdt_close(struct inode *i, struct file *f)
|
||||
{
|
||||
if (vmwdt_expect_close == 42)
|
||||
vmwdt_disable();
|
||||
vmwdt_expect_close = 0;
|
||||
clear_bit(VMWDT_OPEN, &vmwdt_is_open);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct watchdog_info vmwdt_info = {
|
||||
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
||||
.firmware_version = 0,
|
||||
.identity = "z/VM Watchdog Timer",
|
||||
};
|
||||
|
||||
static int __vmwdt_ioctl(unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
if (copy_to_user((void __user *)arg, &vmwdt_info,
|
||||
sizeof(vmwdt_info)))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
return put_user(0, (int __user *)arg);
|
||||
case WDIOC_GETTEMP:
|
||||
return -EINVAL;
|
||||
case WDIOC_SETOPTIONS:
|
||||
{
|
||||
int options, ret;
|
||||
if (get_user(options, (int __user *)arg))
|
||||
return -EFAULT;
|
||||
ret = -EINVAL;
|
||||
if (options & WDIOS_DISABLECARD) {
|
||||
ret = vmwdt_disable();
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
if (options & WDIOS_ENABLECARD) {
|
||||
ret = vmwdt_keepalive();
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
case WDIOC_GETTIMEOUT:
|
||||
return put_user(vmwdt_interval, (int __user *)arg);
|
||||
case WDIOC_SETTIMEOUT:
|
||||
{
|
||||
int interval;
|
||||
if (get_user(interval, (int __user *)arg))
|
||||
return -EFAULT;
|
||||
if (interval < MIN_INTERVAL)
|
||||
return -EINVAL;
|
||||
vmwdt_interval = interval;
|
||||
}
|
||||
return vmwdt_keepalive();
|
||||
case WDIOC_KEEPALIVE:
|
||||
return vmwdt_keepalive();
|
||||
}
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static long vmwdt_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
int rc;
|
||||
|
||||
mutex_lock(&vmwdt_mutex);
|
||||
rc = __vmwdt_ioctl(cmd, arg);
|
||||
mutex_unlock(&vmwdt_mutex);
|
||||
return (long) rc;
|
||||
}
|
||||
|
||||
static ssize_t vmwdt_write(struct file *f, const char __user *buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
if(count) {
|
||||
if (!vmwdt_nowayout) {
|
||||
size_t i;
|
||||
|
||||
/* note: just in case someone wrote the magic character
|
||||
* five months ago... */
|
||||
vmwdt_expect_close = 0;
|
||||
|
||||
for (i = 0; i != count; i++) {
|
||||
char c;
|
||||
if (get_user(c, buf+i))
|
||||
return -EFAULT;
|
||||
if (c == 'V')
|
||||
vmwdt_expect_close = 42;
|
||||
}
|
||||
}
|
||||
/* someone wrote to us, we should restart timer */
|
||||
vmwdt_keepalive();
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
static int vmwdt_resume(void)
|
||||
{
|
||||
clear_bit(VMWDT_OPEN, &vmwdt_is_open);
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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 vmwdt_suspend(void)
|
||||
{
|
||||
if (test_and_set_bit(VMWDT_OPEN, &vmwdt_is_open)) {
|
||||
pr_err("The system cannot be suspended while the watchdog"
|
||||
" is in use\n");
|
||||
return notifier_from_errno(-EBUSY);
|
||||
}
|
||||
if (test_bit(VMWDT_RUNNING, &vmwdt_is_open)) {
|
||||
clear_bit(VMWDT_OPEN, &vmwdt_is_open);
|
||||
pr_err("The system cannot be suspended while the watchdog"
|
||||
" is running\n");
|
||||
return notifier_from_errno(-EBUSY);
|
||||
}
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function is called for suspend and resume.
|
||||
*/
|
||||
static int vmwdt_power_event(struct notifier_block *this, unsigned long event,
|
||||
void *ptr)
|
||||
{
|
||||
switch (event) {
|
||||
case PM_POST_HIBERNATION:
|
||||
case PM_POST_SUSPEND:
|
||||
return vmwdt_resume();
|
||||
case PM_HIBERNATION_PREPARE:
|
||||
case PM_SUSPEND_PREPARE:
|
||||
return vmwdt_suspend();
|
||||
default:
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
}
|
||||
|
||||
static struct notifier_block vmwdt_power_notifier = {
|
||||
.notifier_call = vmwdt_power_event,
|
||||
};
|
||||
|
||||
static const struct file_operations vmwdt_fops = {
|
||||
.open = &vmwdt_open,
|
||||
.release = &vmwdt_close,
|
||||
.unlocked_ioctl = &vmwdt_ioctl,
|
||||
.write = &vmwdt_write,
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = noop_llseek,
|
||||
};
|
||||
|
||||
static struct miscdevice vmwdt_dev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &vmwdt_fops,
|
||||
};
|
||||
|
||||
static int __init vmwdt_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = vmwdt_probe();
|
||||
if (ret)
|
||||
return ret;
|
||||
ret = register_pm_notifier(&vmwdt_power_notifier);
|
||||
if (ret)
|
||||
return ret;
|
||||
/*
|
||||
* misc_register() has to be the last action in module_init(), because
|
||||
* file operations will be available right after this.
|
||||
*/
|
||||
ret = misc_register(&vmwdt_dev);
|
||||
if (ret) {
|
||||
unregister_pm_notifier(&vmwdt_power_notifier);
|
||||
return ret;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
module_init(vmwdt_init);
|
||||
|
||||
static void __exit vmwdt_exit(void)
|
||||
{
|
||||
unregister_pm_notifier(&vmwdt_power_notifier);
|
||||
misc_deregister(&vmwdt_dev);
|
||||
}
|
||||
module_exit(vmwdt_exit);
|
||||
Loading…
Reference in a new issue