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Date: Thu, 20 Sep 2018 08:32:26 +0200 From: Christoph Hellwig <hch@....de> To: Ming Lei <ming.lei@...hat.com> Cc: Vitaly Kuznetsov <vkuznets@...hat.com>, Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, Ming Lei <tom.leiming@...il.com>, linux-block <linux-block@...r.kernel.org>, linux-mm <linux-mm@...ck.org>, Linux FS Devel <linux-fsdevel@...r.kernel.org>, "open list:XFS FILESYSTEM" <linux-xfs@...r.kernel.org>, Dave Chinner <dchinner@...hat.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk> Subject: Re: block: DMA alignment of IO buffer allocated from slab On Thu, Sep 20, 2018 at 09:28:37AM +0800, Ming Lei wrote: > > has e.g. PAGE_SIZE alignment requirement (this would likely imply that > > it's sector size is also not 512 I guess)? > > Yeah, that can be true if one controller has 4k-byte sector size, also > its DMA alignment is 4K. But there shouldn't be cases in which the two > doesn't match. The general block storage worlds is that devices always need to have an alignment requirement <= minimum LBAs size. If they don't they'll need to bounce buffer (in the driver!).
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