linux-kernel - Re: swiotlb default size (64 MB) too small?

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Message-Id: <20090128085825W.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 28 Jan 2009 08:57:43 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	stefanr@...6.in-berlin.de
Cc:	fujita.tomonori@....ntt.co.jp,
	linux1394-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: swiotlb default size (64 MB) too small?

On Wed, 28 Jan 2009 00:46:13 +0100
Stefan Richter <stefanr@...6.in-berlin.de> wrote:

> FUJITA Tomonori wrote:
> > On Tue, 27 Jan 2009 18:03:40 +0100 (CET)
> > Stefan Richter <stefanr@...6.in-berlin.de> wrote:
> >> +static void sbp2_unmap_scatterlist(struct device *card_device,
> >> +				   struct sbp2_command_orb *orb)
> >> +{
> >> +	if (scsi_sg_count(orb->cmd))
> >> +		dma_unmap_sg(card_device, scsi_sglist(orb->cmd),
> >> +			     scsi_sg_count(orb->cmd),
> >> +			     orb->cmd->sc_data_direction);
> >> +
> >> +	if (orb->page_table_bus)
> >> +		dma_unmap_single(card_device, orb->page_table_bus,
> >> +				 sizeof(orb->page_table), DMA_TO_DEVICE);
> > 
> > Well, this does not look correct since zero can be a valid dma
> > address.
> 
> Hmm.
> 
> > static void sbp2_unmap_scatterlist(struct device *card_device,
> > 				   struct sbp2_command_orb *orb)
> > {
> > 	if (scsi_sg_count(orb->cmd))
> > 		dma_unmap_sg(card_device, scsi_sglist(orb->cmd),
> > 			     scsi_sg_count(orb->cmd),
> > 			     orb->cmd->sc_data_direction);
> > 
> > 	if (scsi_sg_count(orb->cmd) > 1)
> > 		dma_unmap_single(card_device, orb->page_table_bus,
> > 				 sizeof(orb->page_table), DMA_TO_DEVICE);
> > 
> > 
> > Well, looks cranky a bit but firewire is cranky for me :)
> 
> Even if scsi_sg_count(cmd) > 1, the outcome of dma_map_sg() could have
> been 1, couldn't it?  So I need to take note of that in another way.

Oops, right. Probably, you need to store the return value of
dma_map_sg in orb.
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