[v3] powerpc/powernv: Make possible for user to force a full ipl cec reboot

[Michael Ellerman]

On Fri, 2018-09-07 at 07:34:48 UTC, Vaibhav Jain wrote:
> Ever since fast reboot is enabled by default in opal,
> opal_cec_reboot() will use fast-reset instead of full IPL to perform
> system reboot. This leaves the user with no direct way to force a full
> IPL reboot except changing an nvram setting that persistently disables
> fast-reset for all subsequent reboots.
> 
> This patch provides a more direct way for the user to force a one-shot
> full IPL reboot by passing the command line argument 'full' to the
> reboot command. So the user will be able to tweak the reboot behavior
> via:
> 
>   $ sudo reboot full	# Force a full ipl reboot skipping fast-reset
> 
>   or
>   $ sudo reboot  	# default reboot path (usually fast-reset)
> 
> The reboot command passes the un-parsed command argument to the kernel
> via the 'Reboot' syscall which is then passed on to the arch function
> pnv_restart(). The patch updates pnv_restart() to handle this cmd-arg
> and issues opal_cec_reboot2 with OPAL_REBOOT_FULL_IPL to force a full
> IPL reset.
> 
> Signed-off-by: Vaibhav Jain <vaibhav at linux.ibm.com>
> Acked-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/8139046a5a34787849df81f4a5875c

cheers