linux-kernel - Re: [PATCH] AMD IOMMU: use iommu_device_max

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Date:	Wed, 1 Oct 2008 18:30:08 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] AMD IOMMU: use iommu_device_max_index

Ingo,

can you please apply this patch to your x86/iommu directly? For a single
patch it makes no sense to go through my tree.

Joerg

On Mon, Sep 29, 2008 at 12:06:36AM +0900, FUJITA Tomonori wrote:
> This is against tip/iommu.
> 
> =
> From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Subject: [PATCH] AMD IOMMU: use iommu_device_max_index
> 
> AMD IOMMU can use iommu_device_max_index() instead of the homegrown
> function.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>

Signed-off-by: Joerg Roedel <joerg.roedel@....com>

> ---
>  arch/x86/kernel/amd_iommu.c |   10 +++-------
>  1 files changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
> index 2028810..34e4d11 100644
> --- a/arch/x86/kernel/amd_iommu.c
> +++ b/arch/x86/kernel/amd_iommu.c
> @@ -480,10 +480,6 @@ static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom,
>   * efficient allocator.
>   *
>   ****************************************************************************/
> -static unsigned long dma_mask_to_pages(unsigned long mask)
> -{
> -	return PAGE_ALIGN(mask) >> PAGE_SHIFT;
> -}
>  
>  /*
>   * The address allocator core function.
> @@ -496,14 +492,14 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
>  					     unsigned long align_mask,
>  					     u64 dma_mask)
>  {
> -	unsigned long limit = dma_mask_to_pages(dma_mask);
> +	unsigned long limit;
>  	unsigned long address;
> -	unsigned long size = dom->aperture_size >> PAGE_SHIFT;
>  	unsigned long boundary_size;
>  
>  	boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
>  			PAGE_SIZE) >> PAGE_SHIFT;
> -	limit = limit < size ? limit : size;
> +	limit = iommu_device_max_index(dom->aperture_size >> PAGE_SHIFT, 0,
> +				       dma_mask >> PAGE_SHIFT);
>  
>  	if (dom->next_bit >= limit) {
>  		dom->next_bit = 0;
> -- 
> 1.5.4.2
> 
> 

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