[PATCH v2] powerpc/powernv: Make possible for user to force a full ipl cec reboot

[Vasant Hegde]

On 09/03/2018 03:56 PM, 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:
> 

.../...

> 
>   /* Argument to OPAL_PCI_TCE_KILL */
> diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
> index adddde023622..650484e0940b 100644
> --- a/arch/powerpc/platforms/powernv/setup.c
> +++ b/arch/powerpc/platforms/powernv/setup.c
> @@ -224,7 +224,22 @@ static void  __noreturn pnv_restart(char *cmd)
>   	pnv_prepare_going_down();
> 
>   	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
> -		rc = opal_cec_reboot();
> +		/* See if we need to do a full IPL reboot */
> +		if (cmd && strcmp(cmd, "full") == 0)
> +			rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL);
> +		else
> +			rc = OPAL_UNSUPPORTED;

As discussed offline, please handle OPAL_SUCCESS case well.

-Vasant