linux-kernel - Re: [RFC] MMIO accessors & barriers documentation

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Message-Id: <1157995595.23085.194.camel@localhost.localdomain>
Date:	Mon, 11 Sep 2006 18:26:35 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jeff Garzik <jgarzik@...ox.com>,
	Paul Mackerras <paulus@...ba.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Segher Boessenkool <segher@...nel.crashing.org>
Subject: Re: [RFC] MMIO accessors & barriers documentation

Ar Llu, 2006-09-11 am 19:59 +1000, ysgrifennodd Benjamin Herrenschmidt:
> Ok, so we would define ordering on the first and last accesses (being
> the first and last in ascending addresses order) and leave it free to
> the implementation to do what it wants in between. Is that ok ?

Not sure you can go that far. I'd stick to "_fromio/_toio" transfer
blocks of data efficiently between host and bus addresses. The
guarantees are the same as readl/writel respectively with respect to the
start and end of the transfer.

[How do you define start and end addresses with memcpy_fromio(foo, bar,
4) for example ]


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