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Subject[PATCH 4/6] watchdog/hpwdt: Add module parameter kdumptimeout.
Date
Instead of unconditionally stopping the watchdog timer after receipt of
a pretimeout NMI, reprogram the timeout based upon module parameter
kdumptimeout.

The provides a more flexible override than the depricated allow_kdump.

Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com>
---
drivers/watchdog/hpwdt.c | 27 ++++++++++++++++++++++++---
1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index aa4101c..dc65006 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -29,7 +29,8 @@
#define HPWDT_VERSION "2.0.2"
#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
-#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
+#define HPWDT_MAX_TICKS 65535
+#define HPWDT_MAX_TIMER TICKS_TO_SECS(HPWDT_MAX_TICKS)
#define DEFAULT_MARGIN 30
#define PRETIMEOUT_SEC 9

@@ -37,6 +38,7 @@
static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
static bool nowayout = WATCHDOG_NOWAYOUT;
static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING);
+static int kdumptimeout = -1;

static void __iomem *pci_mem_addr; /* the PCI-memory address */
static unsigned long __iomem *hpwdt_nmistat;
@@ -56,6 +58,7 @@
{0}, /* terminate list */
};

+static struct watchdog_device hpwdt_dev;
/*
* Watchdog operations
*/
@@ -94,12 +97,18 @@ static int hpwdt_stop_core(struct watchdog_device *wdd)
return 0;
}

+static void hpwdt_ping_ticks(int val)
+{
+ val = min(val, HPWDT_MAX_TICKS);
+ iowrite16(val, hpwdt_timer_reg);
+}
+
static int hpwdt_ping(struct watchdog_device *wdd)
{
int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000));

dev_dbg(wdd->parent, "ping watchdog 0x%08x:0x%08x\n", wdd->timeout, reload);
- iowrite16(reload, hpwdt_timer_reg);
+ hpwdt_ping_ticks(reload);

return 0;
}
@@ -175,7 +184,14 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
if (ilo5 && !pretimeout && !mynmi)
return NMI_DONE;

- hpwdt_stop();
+ if (kdumptimeout < 0)
+ hpwdt_stop();
+ else if (kdumptimeout == 0)
+ ;
+ else {
+ unsigned int val = max((unsigned int)kdumptimeout, hpwdt_dev.timeout);
+ hpwdt_ping_ticks(SECS_TO_TICKS(val));
+ }

hex_byte_pack(panic_msg, mynmi);
nmi_panic(regs, panic_msg);
@@ -328,6 +344,7 @@ static int hpwdt_init_one(struct pci_dev *dev,
pretimeout = 0;
}
hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0;
+ kdumptimeout = min(kdumptimeout, HPWDT_MAX_TIMER);

hpwdt_dev.parent = &dev->dev;
retval = watchdog_register_device(&hpwdt_dev);
@@ -342,6 +359,7 @@ static int hpwdt_init_one(struct pci_dev *dev,
hpwdt_dev.timeout, nowayout);
dev_info(&dev->dev, "pretimeout: %s.\n",
pretimeout ? "on" : "off");
+ dev_info(&dev->dev, "kdumptimeout: %d.\n", kdumptimeout);

if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
ilo5 = true;
@@ -387,6 +405,9 @@ static void hpwdt_exit(struct pci_dev *dev)
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

+module_param(kdumptimeout, int, 0444);
+MODULE_PARM_DESC(kdumptimeout, "Timeout applied for crash kernel transition in seconds");
+
#ifdef CONFIG_HPWDT_NMI_DECODING
module_param(pretimeout, bool, 0);
MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
--
1.8.3.1
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