linux-kernel - Re: [PATCH 3/5] swiotlb: swiotlb_bus_to

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Date:	Wed, 25 Mar 2009 11:58:27 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	beckyb@...nel.crashing.org
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	fujita.tomonori@....ntt.co.jp, ian.campbell@...rix.com,
	jeremy@...p.org
Subject: Re: [PATCH 3/5] swiotlb: swiotlb_bus_to_virt/phys prototype changes

On Tue, 24 Mar 2009 16:28:44 -0500
Becky Bruce <beckyb@...nel.crashing.org> wrote:

> Make these functions take the hwdev as an argument because on some
> platforms it contains a per-device offset that is used to convert
> from bus addresses to/from other types of addresses.
> 
> Also, make these weak so architectures can override the default
> behavior (for example, by adding an offset in the hwdev).
> 
> Signed-off-by: Becky Bruce <beckyb@...nel.crashing.org>
> ---
>  arch/x86/kernel/pci-swiotlb.c |    2 +-
>  include/linux/swiotlb.h       |    4 +++-
>  lib/swiotlb.c                 |   31 +++++++++++++++++++------------
>  3 files changed, 23 insertions(+), 14 deletions(-)

> @@ -847,10 +847,14 @@ swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
>  
>  	for_each_sg(sgl, sg, nelems, i) {
>  		if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg)))
> -			unmap_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
> -				     sg->dma_length, dir);
> +			unmap_single(
> +				hwdev,
> +				swiotlb_bus_to_virt(hwdev, sg->dma_address),
> +				sg->dma_length, dir);
>  		else if (dir == DMA_FROM_DEVICE)
> -			dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length);
> +			dma_mark_clean(
> +				swiotlb_bus_to_virt(hwdev, sg->dma_address),
> +				sg->dma_length);
>  	}

The coding style looks a bit odd to me. How about something like this?

for_each_sg(sgl, sg, nelems, i) {
	void *virt = swiotlb_bus_to_virt(hwdev, sg->dma_address),
	if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg)))
		unmap_single(hwdev, virt, sg->dma_length, dir);
	else if (dir == DMA_FROM_DEVICE)
		dma_mark_clean(virt, sg->dma_length);


>  }
>  EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
> @@ -881,10 +885,13 @@ swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
>  
>  	for_each_sg(sgl, sg, nelems, i) {
>  		if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg)))
> -			sync_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
> +			sync_single(hwdev,
> +				    swiotlb_bus_to_virt(hwdev, sg->dma_address),
>  				    sg->dma_length, dir, target);
>  		else if (dir == DMA_FROM_DEVICE)
> -			dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length);
> +			dma_mark_clean(
> +				swiotlb_bus_to_virt(hwdev, sg->dma_address),
> +				sg->dma_length);
>  	}

Ditto.


The rest looks fine to me.
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