linux-kernel - Re: [PATCH -mm 09/11] call blk_queue_segment_boundary in __scsi_alloc

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Date:	Wed, 24 Oct 2007 23:15:17 +0900
From:	FUJITA Tomonori <tomof@....org>
To:	jeff@...zik.org, jens.axboe@...cle.com
Cc:	tomof@....org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	James.Bottomley@...elEye.com, fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH -mm 09/11] call blk_queue_segment_boundary in
 __scsi_alloc_queue

On Wed, 24 Oct 2007 07:39:16 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> FUJITA Tomonori wrote:
> > request_queue and device struct must have the same value of a segment
> > size limit. This patch adds blk_queue_segment_boundary in
> > __scsi_alloc_queue so LLDs don't need to call both
> > blk_queue_segment_boundary and set_dma_max_seg_size. A LLD can change
> > the default value (64KB) can call device_dma_parameters accessors like
> > pci_set_dma_max_seg_size when allocating scsi_host.
> > 
> > Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > ---
> >  drivers/scsi/scsi_lib.c |    3 +++
> >  1 files changed, 3 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> > index 61fdaf0..23a30ab 100644
> > --- a/drivers/scsi/scsi_lib.c
> > +++ b/drivers/scsi/scsi_lib.c
> > @@ -1645,6 +1645,7 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
> >  					 request_fn_proc *request_fn)
> >  {
> >  	struct request_queue *q;
> > +	struct device *dev = shost->shost_gendev.parent;
> >  
> >  	q = blk_init_queue(request_fn, NULL);
> >  	if (!q)
> > @@ -1673,6 +1674,8 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
> >  	blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));
> >  	blk_queue_segment_boundary(q, shost->dma_boundary);
> >  
> > +	blk_queue_max_segment_size(q, dma_get_max_seg_size(dev));
> > +
> 
> it would be nice to have something more general that's useable in 
> drivers/block/sx8.c (for example), something like
> 
> 	static inline void
> 	dev_blk_associate(struct device *dev, request_queue *q)
> 	{
> 		blk_queue_max_segment_size(q,
> 					dma_get_max_seg_size(dev));
> 	}
> 
> still, I will ACK the above patch (#9) in case you wish that to become a 
> future cleanup, or others dislike this suggestion

Yeah, I thought about something like that. But I can't find many
non-scsi drivers (ide, sx8, mmc/card/, anymore?) doing dma and having
the restrictions so I just call blk_queue_max_segment_size here.

Either is ok with me. I'll modify the patch if Jens prefers such
function. Jens?
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