Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 337 insertions, 0 deletions

diff --git a/drivers/s390/char/vmwatchdog.c b/drivers/s390/char/vmwatchdog.c
new file mode 100644
index 00000000..2211277a
--- /dev/null
+++ b/drivers/s390/char/vmwatchdog.c
@@ -0,0 +1,337 @@
+/*
+ * 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 <arndb@de.ibm.com>");
+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)
+{
+	int ret = __diag288(wdt_cancel, 0, "", 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 */
+	static char __initdata 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);