linux-kernel - Re: SCSI breakage on non-cache coherent architectures

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Message-ID: <adapry5ykps.fsf@cisco.com>
Date:	Mon, 19 Nov 2007 13:43:59 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	benh@...nel.crashing.org
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Russell King <rmk@....linux.org.uk>
Subject: Re: SCSI breakage on non-cache coherent architectures

 > I've been debugging various issues on the PowerPC 44x embedded
 > architecture which happens to have non-coherent PCI DMA.
 > 
 > One of the problem I'm hitting is that one really need to enforce
 > kmalloc alignement to cache lines or bad things will happen (among
 > others with USB), for some reasons, powerpc failed to do so, I fixed it.

Heh... I hit the same problem literally 5 years ago:
    http://lwn.net/Articles/1783/

I implemented the __dma_buffer annotation:
    http://lwn.net/Articles/2269/

But DaveM said we should just use the PCI pool code instead:
    http://lwn.net/Articles/2270/

 - R.
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