From: Guenter Roeck <email@example.com> To: Jose Noguera <firstname.lastname@example.org>, email@example.com, firstname.lastname@example.org Cc: Hans De Goede <email@example.com>, Peter Robinson <firstname.lastname@example.org> Subject: Re: [Watchdog drivers] - WDIOC_GETSUPPORT clarification Date: Wed, 18 Aug 2021 07:13:50 -0700 [thread overview] Message-ID: <email@example.com> (raw) In-Reply-To: <CAKu6O181WOq36RCDO0VPcsZZoUFAJ88BMqv0Hqf+qYCeZsMJtQ@mail.gmail.com> On 8/18/21 2:57 AM, Jose Noguera wrote: > Hello all! > > I’m Jose, working in Red Hat on Fedora IoT and RHEL For Edge related projects. > > While trying to add the feature of figuring out whether the current boot was triggered or not by a hardware watchdog using wdctl, we’ve found an odd behaviour in the drivers definition that we would like to check with you. > > Looking specifically for the flag WDIOF_CARDRESET, we can find 40 files that contain it: > > $ grep -rl CARDRESET drivers/watchdog/ | wc -l > 40 > > but only 19 of them have the flag advertised in the options field of the watchdog_info struct returned by the WDIOC_GETSUPPORT ioctl. > > This leads to wdctl not showing WDIOF_CARDRESET for drivers like i6300esb, even when the board had been reset this way: > > $ sudo wdctl > Device: /dev/watchdog0 > Identity: i6300ESB timer [version 0] > Timeout: 30 seconds > Pre-timeout: 0 seconds > > FLAG DESCRIPTION STATUS BOOT-STATUS > KEEPALIVEPING Keep alive ping reply 1 0 > MAGICCLOSE Supports magic close char 0 0 > SETTIMEOUT Set timeout (in seconds) 0 0 > > Working with Hans (in CC), we added a little patch (BugZilla ticket: 1993983) on wdctl and this would be the output of the command when it was a card reset triggered boot: > > $ sudo wdctl > Device: /dev/watchdog0 > Identity: i6300ESB timer [version 0] > Thank you all for your time, > > Jose > Timeout: 30 seconds > Pre-timeout: 0 seconds > > FLAG DESCRIPTION STATUS BOOT-STATUS > CARDRESET Card previously reset the CPU 1 1 > KEEPALIVEPING Keep alive ping reply 1 0 > MAGICCLOSE Supports magic close char 0 0 > SETTIMEOUT Set timeout (in seconds) 0 0 > > So our question is, may we know what is intended to be present in ident.options? What should the API call WDIOC_GETSUPPORT return in the options field? > Search for WDIOC_GETSUPPORT in Documentation/watchdog/watchdog-api.rst. I don't see any ambiguity there. Patches welcome. Guenter
next prev parent reply other threads:[~2021-08-18 14:15 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <CAKu6O181WOq36RCDO0VPcsZZoUFAJ88BMqv0Hqf+qYCeZsMJtQ@mail.gmail.com> 2021-08-18 12:53 ` Hans de Goede 2021-08-18 14:13 ` Guenter Roeck [this message] 2021-08-18 14:49 ` Hans de Goede 2021-08-18 14:53 ` Guenter Roeck 2021-09-01 11:15 ` Peter Robinson 2021-09-01 19:51 ` Guenter Roeck
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