[v6] powerpc/powernv: Add poweroff (EPOW, DPO) events support for PowerNV platform

[Michael Ellerman]

On Thu, 2015-04-06 at 12:03:17 UTC, Vipin K Parashar wrote:
> This patch adds support for FSP (Flexible Service Processor)
> EPOW (Early Power Off Warning) and DPO (Delayed Power Off) events for
> the PowerNV platform. EPOW events are generated by FSP due to various
> critical system conditions that require system shutdown. A few examples
> of these conditions are high ambient temperature or system running on
> UPS power with low UPS battery. DPO event is generated in response to
> admin initiated system shutdown request. Upon receipt of EPOW and DPO
> events the host kernel invokes orderly_poweroff() for performing
> graceful system shutdown.
> 
> Reviewed-by: Joel Stanley <joel at jms.id.au>
> Reviewed-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
> Reviewed-by: Michael Ellerman <mpe at ellerman.id.au>
> Signed-off-by: Vipin K Parashar <vipin at linux.vnet.ibm.com>

Hi Vipin,

One issue, on mambo I'm seeing:

  [666973573,3] OPAL: Called with bad token 105 !
  opal-power: Existing DPO event detected.
  reboot: Failed to start orderly shutdown: forcing the issue
  reboot: Power down
  [684431322,5] OPAL: Shutdown request type 0x0...


ie. at boot it shuts down immediately.

The problem is in here I think:

> +	/* Check for DPO event */
> +	rc = opal_get_dpo_status(&opal_dpo_timeout);
> +	if (rc != OPAL_WRONG_STATE) {
> +		pr_info("Existing DPO event detected.\n");
> +		return true;
> +	}


This also makes me think you probably haven't tested this on a BMC machine?

cheers