linux-kernel - Re: [PATCH v4 07/11] powerpc/pseries/iommu: Reorganize iommu_table

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Date:   Tue, 13 Jul 2021 01:47:03 -0300
From:   Leonardo Brás <leobras.c@...il.com>
To:     Alexey Kardashevskiy <aik@...abs.ru>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Joel Stanley <joel@....id.au>,
        Christophe Leroy <christophe.leroy@....fr>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 07/11] powerpc/pseries/iommu: Reorganize
 iommu_table_setparms*() with new helper

Hello Alexey, 

On Fri, 2021-06-18 at 19:26 -0300, Leonardo Brás wrote:
> > 
> > > +                                        unsigned long liobn,
> > > unsigned long win_addr,
> > > +                                        unsigned long
> > > window_size,
> > > unsigned long page_shift,
> > > +                                        unsigned long base,
> > > struct
> > > iommu_table_ops *table_ops)
> > 
> > 
> > iommu_table_setparms() rather than passing 0 around.
> > 
> > The same comment about "liobn" - set it in
> > iommu_table_setparms_lpar().
> > The reviewer will see what field atters in what situation imho.
> > 
> 
> The idea here was to keep all tbl parameters setting in
> _iommu_table_setparms (or iommu_table_setparms_common).
> 
> I understand the idea that each one of those is optional in the other
> case, but should we keep whatever value is present in the other
> variable (not zeroing the other variable), or do someting like:
> 
> tbl->it_index = 0;
> tbl->it_base = basep;
> (in iommu_table_setparms)
> 
> tbl->it_index = liobn;
> tbl->it_base = 0;
> (in iommu_table_setparms_lpar)
> 

This one is supposed to be a question, but I missed the question mark.
Sorry about that.

I would like to get your opinion in this :)