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Subject[PATCH 06/10] watchdog/hpwdt: Modify to use watchdog core.
Date
Follow Documentation/watchdog/convert_drivers_to_kernel_api.txt to
convert hpwdt from legacy watchdog driver to use the watchdog core.

Removed functions: hpwdt_open, hpwdt_release, hpwdt_write, hpwdt_ioctl
Removed data structures: hpwdt_fops, hpwdt_miscdev, watchdog_device
Modified functions: hpwdt_start, hpwdt_stop, hpwdt_ping, hpwdt_gettimeleft
Added functions: hpwdt_settimeout
Added structures: watchdog_device

Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com>
---
drivers/watchdog/hpwdt.c | 254 ++++++++++++-----------------------------------
1 file changed, 66 insertions(+), 188 deletions(-)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 3fae3119369f..a8e5c6542406 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -14,18 +14,13 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/device.h>
-#include <linux/fs.h>
-#include <linux/io.h>
-#include <linux/bitops.h>
#include <linux/kernel.h>
-#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
-#include <linux/pci_ids.h>
#include <linux/types.h>
-#include <linux/uaccess.h>
#include <linux/watchdog.h>
+
#include <asm/nmi.h>

#define HPWDT_VERSION "1.4.0"
@@ -38,8 +33,6 @@ static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
static unsigned int reload; /* the computed soft_margin */
static bool nowayout = WATCHDOG_NOWAYOUT;
static unsigned int allow_kdump = 1;
-static char expect_release;
-static unsigned long hpwdt_is_open;

static void __iomem *pci_mem_addr; /* the PCI-memory address */
static unsigned long __iomem *hpwdt_nmistat;
@@ -53,53 +46,58 @@ static const struct pci_device_id hpwdt_devices[] = {
};
MODULE_DEVICE_TABLE(pci, hpwdt_devices);

+static struct watchdog_device hpwdt_dev;

/*
* Watchdog operations
*/
-static void hpwdt_start(void)
+static int hpwdt_start(struct watchdog_device *dev)
{
- reload = SECS_TO_TICKS(soft_margin);
+ reload = SECS_TO_TICKS(dev->timeout);
+
iowrite16(reload, hpwdt_timer_reg);
iowrite8(0x85, hpwdt_timer_con);
+
+ return 0;
}

-static void hpwdt_stop(void)
+static int hpwdt_stop(struct watchdog_device *dev)
{
unsigned long data;

data = ioread8(hpwdt_timer_con);
data &= 0xFE;
iowrite8(data, hpwdt_timer_con);
+ return 0;
}

-static void hpwdt_ping(void)
-{
- iowrite16(reload, hpwdt_timer_reg);
-}
-
-static int hpwdt_change_timer(int new_margin)
+static int hpwdt_ping(struct watchdog_device *dev)
{
- if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
- pr_warn("New value passed in is invalid: %d seconds\n",
- new_margin);
- return -EINVAL;
- }
+ reload = SECS_TO_TICKS(dev->timeout);

- soft_margin = new_margin;
- pr_debug("New timer passed in is %d seconds\n", new_margin);
- reload = SECS_TO_TICKS(soft_margin);
+ iowrite16(reload, hpwdt_timer_reg);

return 0;
}

-static int hpwdt_time_left(void)
+static unsigned int hpwdt_gettimeleft(struct watchdog_device *dev)
{
return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
}

+static int hpwdt_settimeout(struct watchdog_device *dev, unsigned int val)
+{
+ pr_debug("settimeout = %d\n", val);
+
+ soft_margin = dev->timeout = val;
+ hpwdt_ping(dev);
+
+ return 0;
+}
+
#ifdef CONFIG_HPWDT_NMI_DECODING /* { */
-static int hpwdt_my_nmi(void)
+
+static unsigned int hpwdt_my_nmi(void)
{
return ioread8(hpwdt_nmistat) & 0x6;
}
@@ -126,8 +124,10 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
if ((ulReason == NMI_UNKNOWN) && !mynmi)
return NMI_DONE;

+ pr_debug("nmi: ulReason=%d, mynmi=0x%0x\n", ulReason, mynmi);
+
if (allow_kdump)
- hpwdt_stop();
+ hpwdt_stop(&hpwdt_dev);

panic_msg[0] = hexdigit((mynmi>>4)&0xf);
panic_msg[1] = hexdigit(mynmi&0xf);
@@ -138,68 +138,6 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
}
#endif /* } */

-/*
- * /dev/watchdog handling
- */
-static int hpwdt_open(struct inode *inode, struct file *file)
-{
- /* /dev/watchdog can only be opened once */
- if (test_and_set_bit(0, &hpwdt_is_open))
- return -EBUSY;
-
- /* Start the watchdog */
- hpwdt_start();
- hpwdt_ping();
-
- return nonseekable_open(inode, file);
-}
-
-static int hpwdt_release(struct inode *inode, struct file *file)
-{
- /* Stop the watchdog */
- if (expect_release == 42) {
- hpwdt_stop();
- } else {
- pr_crit("Unexpected close, not stopping watchdog!\n");
- hpwdt_ping();
- }
-
- expect_release = 0;
-
- /* /dev/watchdog is being closed, make sure it can be re-opened */
- clear_bit(0, &hpwdt_is_open);
-
- return 0;
-}
-
-static ssize_t hpwdt_write(struct file *file, const char __user *data,
- size_t len, loff_t *ppos)
-{
- /* See if we got the magic character 'V' and reload the timer */
- if (len) {
- if (!nowayout) {
- size_t i;
-
- /* note: just in case someone wrote the magic character
- * five months ago... */
- expect_release = 0;
-
- /* scan to see whether or not we got the magic char. */
- for (i = 0; i != len; i++) {
- char c;
- if (get_user(c, data + i))
- return -EFAULT;
- if (c == 'V')
- expect_release = 42;
- }
- }
-
- /* someone wrote to us, we should reload the timer */
- hpwdt_ping();
- }
-
- return len;
-}

static const struct watchdog_info hpwdt_info = {
.options = WDIOF_SETTIMEOUT |
@@ -208,92 +146,13 @@ static const struct watchdog_info hpwdt_info = {
.identity = "HPE iLO2+ HW Watchdog Timer",
};

-static long hpwdt_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- int new_margin, options;
- int ret = -ENOTTY;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- ret = 0;
- if (copy_to_user(argp, &hpwdt_info, sizeof(hpwdt_info)))
- ret = -EFAULT;
- break;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- ret = put_user(0, p);
- break;
-
- case WDIOC_KEEPALIVE:
- hpwdt_ping();
- ret = 0;
- break;
-
- case WDIOC_SETOPTIONS:
- ret = get_user(options, p);
- if (ret)
- break;
-
- if (options & WDIOS_DISABLECARD)
- hpwdt_stop();
-
- if (options & WDIOS_ENABLECARD) {
- hpwdt_start();
- hpwdt_ping();
- }
- break;
-
- case WDIOC_SETTIMEOUT:
- ret = get_user(new_margin, p);
- if (ret)
- break;
-
- ret = hpwdt_change_timer(new_margin);
- if (ret)
- break;
-
- hpwdt_ping();
- /* Fall */
- case WDIOC_GETTIMEOUT:
- ret = put_user(soft_margin, p);
- break;
-
- case WDIOC_GETTIMELEFT:
- ret = put_user(hpwdt_time_left(), p);
- break;
- }
- return ret;
-}
-
-/*
- * Kernel interfaces
- */
-static const struct file_operations hpwdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = hpwdt_write,
- .unlocked_ioctl = hpwdt_ioctl,
- .open = hpwdt_open,
- .release = hpwdt_release,
-};
-
-static struct miscdevice hpwdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &hpwdt_fops,
-};
-
/*
* Init & Exit
*/

-
static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
{
+#ifdef CONFIG_HPWDT_NMI_DECODING /* { */
int retval;
/*
* Only one function can register for NMI_UNKNOWN
@@ -308,10 +167,7 @@ static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
if (retval)
goto error2;

- dev_info(&dev->dev,
- "HPE Watchdog Timer Driver: NMI decoding initialized"
- ", allow kernel dump: %s (default = 1/ON)\n",
- (allow_kdump == 0) ? "OFF" : "ON");
+ dev_info(&dev->dev, "HPE Watchdog Timer Driver: NMI decoding initialized");
return 0;

error2:
@@ -323,6 +179,8 @@ static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
"Unable to register a die notifier (err=%d).\n",
retval);
return retval;
+#endif /* } */
+ return 0;
}

static void hpwdt_exit_nmi_decoding(void)
@@ -376,31 +234,32 @@ static int hpwdt_probe(struct pci_dev *dev, const struct pci_device_id *ent)
hpwdt_timer_con = pci_mem_addr + 0x72;

/* Make sure that timer is disabled until /dev/watchdog is opened */
- hpwdt_stop();
-
- /* Make sure that we have a valid soft_margin */
- if (hpwdt_change_timer(soft_margin))
- hpwdt_change_timer(DEFAULT_MARGIN);
+ hpwdt_stop(&hpwdt_dev);

/* Initialize NMI Decoding functionality */
retval = hpwdt_init_nmi_decoding(dev);
if (retval != 0)
goto error_init_nmi_decoding;

- retval = misc_register(&hpwdt_miscdev);
+ retval = watchdog_register_device(&hpwdt_dev);
if (retval < 0) {
- dev_warn(&dev->dev,
- "Unable to register miscdev on minor=%d (err=%d).\n",
- WATCHDOG_MINOR, retval);
- goto error_misc_register;
+ dev_warn(&dev->dev, "Unable to register hpe watchdog (err=%d).\n", retval);
+ goto error_wd_register;
+ }
+
+ watchdog_set_nowayout(&hpwdt_dev, nowayout);
+ if (watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL)) {
+ dev_warn(&dev->dev, "Invalid soft_margin: %d. Using default\n", soft_margin);
+ soft_margin = DEFAULT_MARGIN;
}

dev_info(&dev->dev, "HPE Watchdog Timer Driver: %s"
", timer margin: %d seconds (nowayout=%d).\n",
- HPWDT_VERSION, soft_margin, nowayout);
+ HPWDT_VERSION, hpwdt_dev.timeout, nowayout);
+
return 0;

-error_misc_register:
+error_wd_register:
hpwdt_exit_nmi_decoding();
error_init_nmi_decoding:
pci_iounmap(dev, pci_mem_addr);
@@ -412,9 +271,9 @@ static int hpwdt_probe(struct pci_dev *dev, const struct pci_device_id *ent)
static void hpwdt_exit(struct pci_dev *dev)
{
if (!nowayout)
- hpwdt_stop();
+ hpwdt_stop(&hpwdt_dev);

- misc_deregister(&hpwdt_miscdev);
+ watchdog_unregister_device(&hpwdt_dev);
hpwdt_exit_nmi_decoding();
pci_iounmap(dev, pci_mem_addr);
pci_disable_device(dev);
@@ -427,6 +286,25 @@ static struct pci_driver hpwdt_driver = {
.remove = hpwdt_exit,
};

+
+static const struct watchdog_ops hpwdt_ops = {
+ .owner = THIS_MODULE,
+ .start = hpwdt_start,
+ .stop = hpwdt_stop,
+ .ping = hpwdt_ping,
+ .set_timeout = hpwdt_settimeout,
+ .get_timeleft = hpwdt_gettimeleft,
+};
+
+static struct watchdog_device hpwdt_dev = {
+ .info = &hpwdt_info,
+ .ops = &hpwdt_ops,
+ .min_timeout = 1,
+ .max_timeout = HPWDT_MAX_TIMER,
+ .timeout = DEFAULT_MARGIN,
+};
+
+
MODULE_AUTHOR("Jerry Hoemann");
MODULE_DESCRIPTION("hpe watchdog driver");
MODULE_LICENSE("GPL");
--
2.13.6
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