linux-kernel - Re: [PATCH] swiotlb: enlarge iotlb buffer on demand

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Message-Id: <20100801120224F.fujita.tomonori@lab.ntt.co.jp>
Date:	Sun, 1 Aug 2010 12:03:11 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	konrad@...nel.org
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, ak@...ux.intel.com,
	konrad.wilk@...cle.com, akataria@...are.com
Subject: Re: [PATCH] swiotlb: enlarge iotlb buffer on demand

On Fri, 30 Jul 2010 21:07:06 -0400
Konrad Rzeszutek Wilk <konrad@...nel.org> wrote:

> I took your patch and was trying to fit it over the
> stable/swiotlb-0.8.4 branch and when I did so a found couple of things..
> 
> 
> > > @@ -215,14 +222,14 @@ swiotlb_late_init_with_default_size(size_t default_size)
> > >  	bytes = io_tlb_nslabs << IO_TLB_SHIFT;
> 
> You should also initialize the __io_tlb_start array first:

Yeah, I know. As I wrote, this patchset breaks IA64.

I really merge to swiotlb's two memory allocator mechanisms
(swiotlb_init_with_default_size and
swiotlb_late_init_with_default_size). I need to look at the x86 memory
boot code after memblock surgery finishes.

And as you know, I've not fixed the error path and swiotlb_free. I'll
do later if people are not against swiotlb dynamic allocation.

Thanks,
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