From: "Bryan O'Sullivan" <bos@pathscale.com>
To: Denis Vlasenko <vda@ilport.com.ua>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org, hch@infradead.org,
ak@suse.de, rdreier@cisco.com
Subject: Re: [PATCH 2 of 3] memcpy32 for x86_64
Date: Thu, 12 Jan 2006 08:04:41 -0800 [thread overview]
Message-ID: <1137081882.28011.1.camel@serpentine.pathscale.com> (raw)
In-Reply-To: <200601121038.17764.vda@ilport.com.ua>
On Thu, 2006-01-12 at 10:38 +0200, Denis Vlasenko wrote:
> 2) On all current x86_64 hardware each 64bit access from/to
> IO mapped addresses is always converted to two 32bit accesses.
This is true for 64-bit writes over Hypertransport (reads don't get
split up this way), but not for PCI-Express memory writes, which remain
atomic 64-bit. I'll be converting the 64-bit accesses to 32-bit, as you
and Andi suggested.
<b
next prev parent reply other threads:[~2006-01-12 16:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-10 19:53 [PATCH 0 of 3] 32-bit MMIO copy routines, reworked Bryan O'Sullivan
2006-01-10 19:53 ` [PATCH 1 of 3] Introduce __raw_memcpy_toio32 Bryan O'Sullivan
2006-01-10 19:53 ` [PATCH 2 of 3] memcpy32 for x86_64 Bryan O'Sullivan
2006-01-12 8:38 ` Denis Vlasenko
2006-01-12 16:04 ` Bryan O'Sullivan [this message]
2006-01-13 9:56 ` Chris Wedgwood
2006-01-13 10:24 ` Denis Vlasenko
2006-01-13 16:21 ` Bryan O'Sullivan
2006-01-10 19:53 ` [PATCH 3 of 3] Add __raw_memcpy_toio32 to each arch Bryan O'Sullivan
2006-01-10 20:08 ` Andi Kleen
2006-01-10 22:52 ` Bryan O'Sullivan
-- strict thread matches above, loose matches on Subject: below --
2006-01-11 22:39 [PATCH 0 of 3] MMIO 32-bit copy routine, the final frontier Bryan O'Sullivan
2006-01-11 22:39 ` [PATCH 2 of 3] memcpy32 for x86_64 Bryan O'Sullivan
2006-01-11 23:45 ` Roland Dreier
2006-01-12 0:03 ` Bryan O'Sullivan
2006-01-06 20:26 [PATCH 0 of 3] 32-bit MMIO copy routine Bryan O'Sullivan
2006-01-06 20:26 ` [PATCH 2 of 3] memcpy32 for x86_64 Bryan O'Sullivan
2005-12-27 23:41 [PATCH 0 of 3] Add memcpy_toio32, a 32-bit MMIO copy routine Bryan O'Sullivan
2005-12-27 23:41 ` [PATCH 2 of 3] memcpy32 for x86_64 Bryan O'Sullivan
2005-12-28 4:22 ` Matt Mackall
2005-12-28 7:54 ` Denis Vlasenko
2005-12-28 14:52 ` Bryan O'Sullivan
2006-01-06 9:12 ` Pavel Machek
2006-01-06 16:02 ` Bryan O'Sullivan
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