[PATCH v5 0/1] soc: fujitsu: Add A64FX diagnostic interrupt driver

[hasegawa-hitomi at fujitsu.com]

Hi

Do you have any comment?

> The interrupt is set using pseudo-NMI if it is available. Arm has a diagnostic
> interrupt feature called "Arm Generic Diagnostic Dump and Reset device", but the
> A64FX does not support this feature and instead has its own device definition.
> 
> I tested on FX700:
> $ echo HARDLOCKUP > /sys/kernel/debug/provoke-crash/DIRECT
> [   86.259226] lkdtm: Performing direct entry HARDLOCKUP
> :
> :
> 
> Send the "chassis power diag" command from the management server using
> ipmitool, the following message is shown:
> [  138.433544] Kernel panic - not syncing: a64fx_diag: interrupt received
> :
> :
> 
> Changes in V5:
>  - Fixing issues raised by Jiri and Greg.
> 
> Changes in V4:
>  - Call the panic function instead of sysrq. Prepare a handler
>    for each NMI/IRQ and call nmi_panic()/panic() respectively (as in v1).
>  - Fixing other issues raised by Greg.
> 
> Changes in V3:
>  - Exclude Sumit's patch.
>  - Retest in v5.17.
> 
> Changes in V2:
>  - Include Sumit's patch.
>  - The handler calls handle_sysrq() to use the sysrq feature to cause
>    a panic.
>  - request_nmi() and request_irq() now use the same handler, and
>    the function name of the handler has also changed.
>  - Use readl()/writel() instead of readl_relaxed()/writel_relaxed().
> 
> V4:
> https://lore.kernel.org/linux-arm-kernel/20220511062113.2645747-1-hasegaw
> a-hitomi at fujitsu.com/
> V3:
> https://lore.kernel.org/linux-arm-kernel/20220331092235.3000787-1-hasegaw
> a-hitomi at fujitsu.com/
> V2:
> https://lore.kernel.org/linux-arm-kernel/20220304064324.331217-3-hasegawa
> -hitomi at fujitsu.com/
> V1:
> https://lore.kernel.org/linux-arm-kernel/20220218092010.1327309-1-hasegaw
> a-hitomi at fujitsu.com/
> 
> 
> Hitomi Hasegawa (1):
>   soc: fujitsu: Add A64FX diagnostic interrupt driver
> 
>  MAINTAINERS                      |   5 +
>  drivers/soc/Kconfig              |   1 +
>  drivers/soc/Makefile             |   1 +
>  drivers/soc/fujitsu/Kconfig      |  16 ++++
>  drivers/soc/fujitsu/Makefile     |   3 +
>  drivers/soc/fujitsu/a64fx-diag.c | 154
> +++++++++++++++++++++++++++++++
>  6 files changed, 180 insertions(+)
>  create mode 100644 drivers/soc/fujitsu/Kconfig  create mode 100644
> drivers/soc/fujitsu/Makefile  create mode 100644
> drivers/soc/fujitsu/a64fx-diag.c
> 
> --
> 2.27.0