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From: Steve Muckle <smuckle@codeaurora.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: LAKML <linux-arm-kernel@lists.infradead.org>,
	Russell King - ARM Linux <linux@arm.linux.org.uk>,
	Linux ARM MSM <linux-arm-msm@vger.kernel.org>
Subject: Re: IO access and *_relaxed macros
Date: Fri, 25 Mar 2011 16:55:16 -0700	[thread overview]
Message-ID: <4D8D2B64.9030709@codeaurora.org> (raw)
In-Reply-To: <1301047705.25814.4.camel@e102109-lin.cambridge.arm.com>

On 03/25/11 03:08, Catalin Marinas wrote:
> Are there other scenarios (in relation with coherent DMA buffers) where
> we need a DSB after writel() or before readl()?

I'm not sure about use with DMA buffers - I've just been looking at
these macros with respect to (non-DMA related) device accesses, since
they're heavily used for this purpose as well.

thanks,
Steve

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

WARNING: multiple messages have this Message-ID (diff)
From: smuckle@codeaurora.org (Steve Muckle)
To: linux-arm-kernel@lists.infradead.org
Subject: IO access and *_relaxed macros
Date: Fri, 25 Mar 2011 16:55:16 -0700	[thread overview]
Message-ID: <4D8D2B64.9030709@codeaurora.org> (raw)
In-Reply-To: <1301047705.25814.4.camel@e102109-lin.cambridge.arm.com>

On 03/25/11 03:08, Catalin Marinas wrote:
> Are there other scenarios (in relation with coherent DMA buffers) where
> we need a DSB after writel() or before readl()?

I'm not sure about use with DMA buffers - I've just been looking at
these macros with respect to (non-DMA related) device accesses, since
they're heavily used for this purpose as well.

thanks,
Steve

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

  reply	other threads:[~2011-03-25 23:55 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-24 18:22 IO access and *_relaxed macros Steve Muckle
2011-03-24 18:22 ` Steve Muckle
2011-03-25 10:08 ` Catalin Marinas
2011-03-25 10:08   ` Catalin Marinas
2011-03-25 23:55   ` Steve Muckle [this message]
2011-03-25 23:55     ` Steve Muckle

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