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Date: Mon, 24 Jun 2019 13:12:08 +1000
From: Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [PATCH 2/3] powerpc/64s/radix: ioremap use ioremap_page_range
To: Christophe Leroy <christophe.leroy@c-s.fr>, linuxppc-dev@lists.ozlabs.org
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Christophe Leroy's on June 20, 2019 2:25 am:
>=20
>=20
> Le 19/06/2019 =C3=A0 05:59, Nicholas Piggin a =C3=A9crit=C2=A0:
>> Christophe Leroy's on June 11, 2019 4:46 pm:
>>>
>>>
>>> Le 10/06/2019 =C3=A0 05:08, Nicholas Piggin a =C3=A9crit=C2=A0:
>> I would like to remove the early ioremap or make it into its own
>> function. Re-implement map_kernel_page with ioremap_page_range,
>> allow page tables that don't use slab to avoid the early check,
>> unbolt the hptes mapped in early boot, etc.
>=20
> Getting early ioremap out of the picture is a very good idea, it will=20
> help making things more common between all platform types. Today we face=20
> the fact that PPC32 allocates early io from the top of memory while=20
> PPC64 allocates it from the bottom of memory.
>=20
> Any idea on how to proceed ?

I have to have a bit better look at other arches and our platform=20
code. Without having looked closely at all the details, I would hope=20
we could use GENERIC_EARLY_IOREMAP without too much pain.

Thanks,
Nick

=