linux-kernel - Re: [PATCH] ACPI: use ioremap

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Message-ID: <4D195AFF.9020106@zytor.com>
Date:	Mon, 27 Dec 2010 19:35:27 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Shaohua Li <shaohua.li@...el.com>
CC:	Len Brown <lenb@...nel.org>, Jack Steiner <steiner@....com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	"tony.luck@...il.com" <tony.luck@...il.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gbeshers@....com" <gbeshers@....com>
Subject: Re: [PATCH] ACPI: use ioremap_cache()

On 12/27/2010 07:21 PM, Shaohua Li wrote:
> RCRB is a memory mapped io. In ICH, it's chipset configuration
> registers. this range can't be cached.
> I thought we should add a check like
> if page is E820_RAM or E820_ACPI then
> 	cached_map
> else
> 	uncached_map
> we have page_is_ram() API which just checks E820_RAM, I thought we can
> add a new API to check E820_ACPI.

For x86, that is handled by the MTRRs; for ia64, I would assume
ioremap() handles that somehow, otherwise it wouldn't be able to handle
existing drivers with ioremap() in them.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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