[Skiboot] [PATCH v4] capi: Poll Err/Status register during CAPP recovery

[christophe lombard]

Le 28/03/2018 à 12:35, Vaibhav Jain a écrit :
> This patch updates do_capp_recovery_scoms() to poll the CAPP
> Err/Status control register, check for CAPP-Recovery to complete/fail
> based on indications of BITS-1,5,9 and then proceed with the
> CAPP-Recovery scoms iif recovery completed successfully. This would
> prevent cases where we bring-up the PCIe link while recovery sequencer
> on CAPP is still busy with casting out cache lines.
> 
> In case CAPP-Recovery didn't complete successfully an error is returned
> from do_capp_recovery_scoms() asking phb4_creset() to keep the phb4
> fenced and mark it as broken.
> 
> The loop that implements polling of Err/Status register will also log
> an error on the PHB when it continues for more than 168ms which is the
> max time to failure for CAPP-Recovery.
> 
> Signed-off-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
> ---
> Changelog:
> v4 -> Use OPAL_SUCCESS for return-code & error check  [Alastair]
> 
> v3 -> Introduced a timeout for the Poll loop of 168ms [Christophe]
> 
> v2 -> Added an extra check for Bit(0) in Err/Status reg at the
>        beginning to check if recovery mode was entered. [Christophe]
> ---

Acked-by:  Christophe Lombard <clombard at linux.vnet.ibm.com>