[RESEND-RFC v2 2/3] powerpc/eeh: Introduce function eeh_pe_reset_freeze_counter()

[Vaibhav Jain]

Hi Russell,

Vaibhav Jain <vaibhav at linux.vnet.ibm.com> writes:

> This patch introduces function eeh_pe_reset_freeze_counter() which can
> be used to reset the PE's freeze count variable outside eeh code. This
> is useful for devices that can acquire a different personality after
> a PERST event (e.g FPGA Adapters). Presently an existing freeze
> count for an adapter with personality N will be taken into account
> when the adapter acquired personality N+1.
>
> By calling eeh_pe_reset_freeze_counter() drivers can reset the freeze
> counter for an adapter once it has acquired a new personality and
> ideally wont be plagued by the failures similar to the one before.
>
> Signed-off-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
> ---
Had a short chat discussion with Gavin Shan on this patchset and he
preffers restoring the freeze_count on the eeh_pe once FRESET is done.
He expects a the flow to be similar to one below

1. module caches the value of freeze_count and resets it
2. Issue warm reset
3. During eeh error-detected callback module restores the freeze_count
from the cached value.

Russell, what do you think? 

-- 
Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
Linux Technology Center, IBM India Pvt. Ltd.