From: "H. Peter Anvin" <hpa@zytor.com>
To: Shaohua Li <shaohua.li@intel.com>
Cc: Len Brown <lenb@kernel.org>, Jack Steiner <steiner@sgi.com>,
Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
"tony.luck@gmail.com" <tony.luck@gmail.com>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"gbeshers@sgi.com" <gbeshers@sgi.com>
Subject: Re: [PATCH] ACPI: use ioremap_cache()
Date: Mon, 27 Dec 2010 19:35:27 -0800 [thread overview]
Message-ID: <4D195AFF.9020106@zytor.com> (raw)
In-Reply-To: <1293506460.10593.43.camel@sli10-conroe>
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.
next prev parent reply other threads:[~2010-12-28 3:35 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-14 22:09 [PATCH] - Mapping ACPI tables as CACHED Jack Steiner
2010-12-14 22:58 ` H. Peter Anvin
2010-12-14 23:22 ` Len Brown
2010-12-15 0:26 ` H. Peter Anvin
2010-12-15 2:27 ` Jack Steiner
2010-12-15 4:17 ` H. Peter Anvin
2010-12-15 0:04 ` Len Brown
2010-12-15 1:18 ` H. Peter Anvin
2010-12-15 2:40 ` Len Brown
2010-12-15 2:41 ` Jack Steiner
2010-12-15 4:03 ` Len Brown
2010-12-15 4:35 ` Len Brown
2010-12-15 6:17 ` H. Peter Anvin
2010-12-15 6:17 ` Milton Miller
2010-12-15 6:29 ` H. Peter Anvin
2010-12-15 16:46 ` Jack Steiner
2010-12-15 21:16 ` Len Brown
2010-12-15 22:18 ` H. Peter Anvin
2010-12-17 2:54 ` Len Brown
2010-12-17 8:08 ` [PATCH] ACPI: use ioremap_cache() Len Brown
2010-12-27 19:42 ` Tony Luck
2010-12-27 20:12 ` H. Peter Anvin
2010-12-28 3:21 ` Shaohua Li
2010-12-28 3:35 ` H. Peter Anvin [this message]
2010-12-28 5:02 ` Shaohua Li
2010-12-28 20:12 ` H. Peter Anvin
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