linux-kernel - Re: [PATCH] swiotlb: use swiotlb_alloc

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Message-Id: <20090331172554E.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 31 Mar 2009 17:26:24 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	jeremy@...p.org
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH] swiotlb: use swiotlb_alloc_boot to allocate emergency
 pool

On Mon, 30 Mar 2009 17:51:34 -0700
Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Impact: bugfix
> 
> Also fix xen_swiotlb_fixup() to deal with sub-slab-sized allocations.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index 0de836d..e8df499 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c
> @@ -202,7 +202,8 @@ swiotlb_init_with_default_size(size_t default_size)
>  	/*
>  	 * Get the overflow emergency buffer
>  	 */
> -	io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
> +	io_tlb_overflow_buffer = swiotlb_alloc_boot(io_tlb_overflow,
> +						    io_tlb_overflow >> IO_TLB_SHIFT);
>  	if (!io_tlb_overflow_buffer)
>  		panic("Cannot allocate SWIOTLB overflow buffer!\n");
>  
> diff --git a/drivers/pci/xen-iommu.c b/drivers/pci/xen-iommu.c
> index 9ce1599..5775691 100644
> --- a/drivers/pci/xen-iommu.c
> +++ b/drivers/pci/xen-iommu.c
> @@ -47,16 +47,22 @@ void xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
>  		buf, size);
>  
>  	dma_bits = get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT) + PAGE_SHIFT;
> -	for (i = 0; i < nslabs; i += IO_TLB_SEGSIZE) {
> +
> +	i = 0;
> +	do {
> +		int slabs = min(nslabs - i, (unsigned long)IO_TLB_SEGSIZE);
> +
>  		do {
>  			rc = xen_create_contiguous_region(
>  				(unsigned long)buf + (i << IO_TLB_SHIFT),
> -				get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT),
> +				get_order(slabs << IO_TLB_SHIFT),
>  				dma_bits);
>  		} while (rc && dma_bits++ < max_dma_bits);
>  		if (rc)
>  			panic(KERN_ERR "xen_create_contiguous_region failed\n");
> -	}
> +
> +		i += slabs;
> +	} while(i < nslabs);
>  }
>  
>  int xen_wants_swiotlb(void)

This is a patch for a tree for dom0? I have no idea what xen-iommu.c
is doing (I don't know if dom0 support will be merged into mainline or
not). But the change to lib/swiotlb.c is fine by me.
--
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