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Message-ID: <b25dff0f130b9ab721b8b524e55a3cd4c244a8f3.camel@gmail.com>
Subject: Re: [PATCH v4 07/11] powerpc/pseries/iommu: Reorganize
 iommu_table_setparms*() with new helper
From:   Leonardo =?ISO-8859-1?Q?Br=E1s?= <leobras.c@gmail.com>
To:     Alexey Kardashevskiy <aik@ozlabs.ru>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Joel Stanley <joel@jms.id.au>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        Nicolin Chen <nicoleotsuka@gmail.com>,
        Niklas Schnelle <schnelle@linux.ibm.com>
Cc:     linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Date:   Tue, 13 Jul 2021 01:47:03 -0300
In-Reply-To: <97626d3883ed207b818760a8239babb08a6b5c59.camel@gmail.com>
References: <20210430163145.146984-1-leobras.c@gmail.com>
         <20210430163145.146984-8-leobras.c@gmail.com>
         <e4984fa0-2afe-a987-4fb8-61b878431b1f@ozlabs.ru>
         <97626d3883ed207b818760a8239babb08a6b5c59.camel@gmail.com>
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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 :)