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Message-ID: <20190606211925.GC1299@roeck-us.net> References: <1558126783-4877-1-git-send-email-jerry.hoemann@hpe.com> <1558126783-4877-5-git-send-email-jerry.hoemann@hpe.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1558126783-4877-5-git-send-email-jerry.hoemann@hpe.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 17, 2019 at 02:59:41PM -0600, Jerry Hoemann wrote: > 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 Reviewed-by: Guenter Roeck > --- > 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");