On 05/11/2015 12:19 PM, Michael Ellerman wrote:
On Thu, 2015-05-07 at 15:00 +0530, Vipin K Parashar wrote:This patch adds support for FSP EPOW (Early Power Off Warning) and DPO (Delayed Power Off) events support for PowerNV platform. EPOW events are generated by SPCN/FSP due to various critical system conditions that need system shutdown. 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. This patch enables host kernel on PowerNV platform to handle OPAL notifications for these events and initiate system poweroff. Since EPOW notifications are sent in advance of impending shutdown event and thus this patch also adds functionality to wait for EPOW condition to return to normal. Host allows MAX_POWEROFF_SYS_TIME (600 seconds) as system poweroff time (time for host + guests shutdown) and waits for remaining time for EPOW condition to return to normal. If EPOW condition doesn't return to normal in calculated time it proceeds with graceful system shutdown. For EPOW events with smaller timeouts values than MAX_POWEROFF_SYS_TIME it proceeds with system shutdown without any wait for EPOW condition to return to normal.Can I suggest an alternative design: - when we recieve a DPO event call orderly_poweroff() - when we recieve an EPOW event call orderly_poweroff() Thoughts?
Will make changes as per suggested design above and sent out patch.
cheers
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