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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
