Hi Pratyush, Great thanks for your testing, this info is very helpful. :-) my new patchset will come out soon. On 30 September 2015 at 13:13, Pratyush Anand <panand@xxxxxxxxxx> wrote: > Hi Fu Wei, > > On 25/08/2015:01:01:15 AM, fu.wei@xxxxxxxxxx wrote: >> From: Fu Wei <fu.wei@xxxxxxxxxx> >> >> This patchset: >> (1)Introduce Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt >> for FDT info of SBSA Generic Watchdog, and give two examples of >> adding SBSA Generic Watchdog device node into the dts files: >> foundation-v8.dts and amd-seattle-soc.dtsi. >> >> (2)Introduce "pretimeout" into the watchdog framework, and update >> Documentation/watchdog/watchdog-kernel-api.txt to introduce: >> (1)the new elements in the watchdog_device and watchdog_ops struct; >> (2)the new API "watchdog_init_timeouts". >> >> (3)Introduce ARM SBSA watchdog driver: >> a.Use linux kernel watchdog framework; >> b.Work with FDT on ARM64; >> c.Use "pretimeout" in watchdog framework; >> d.Support getting timeout and pretimeout from parameter and FDT >> at the driver init stage. >> e.In the first timeout, do panic to save system context; >> f.In the second stage, user can still feed the dog without >> cleaning WS0. By this feature, we can avoid the panic infinite >> loops, while backing up a large system context in a server. >> g.In the second stage, can trigger WS1 by setting pretimeout = 0 >> if necessary. >> >> (4)Introduce ACPI GTDT parser: drivers/acpi/gtdt.c >> Parse SBSA Generic Watchdog Structure in GTDT table of ACPI, >> and create a platform device with that information. >> This platform device can be used by This Watchdog driver. >> drivers/clocksource/arm_arch_timer.c is simplified by this GTDT support. >> >> This patchset has been tested with watchdog daemon >> (ACPI/FDT, module/build-in) on the following platforms: >> (1)ARM Foundation v8 model >> > > I tested it with kdump on fedora-arm64 Seattle platform. I enabled watchdog > using systemd (with 30s timeout), insured that watchdog is active and then > crashed the system. I can see that kdump kernel loads sbsa_wdt and activates > watchdog, still vmcore copy is done successfully. > My test kernel is here [1] > > ~Pratyush > > [1] https://github.com/pratyushanand/linux/commits/wdt/sbsa-test-kexec -- Best regards, Fu Wei Software Engineer Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch Ph: +86 21 61221326(direct) Ph: +86 186 2020 4684 (mobile) Room 1512, Regus One Corporate Avenue,Level 15, One Corporate Avenue,222 Hubin Road,Huangpu District, Shanghai,China 200021 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
