linux-kernel - Re: [PATCH v4 05/11] swiotlb: add swiotlb_set_default

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Message-Id: <20100316104440Y.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 16 Mar 2010 10:44:59 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	albert_herranz@...oo.es
Cc:	linux-usb@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-ia64@...r.kernel.org
Subject: Re: [PATCH v4 05/11] swiotlb: add swiotlb_set_default_size()

On Fri, 12 Mar 2010 20:12:40 +0100
Albert Herranz <albert_herranz@...oo.es> wrote:

> The current SWIOTLB code uses a default of 64MB for the IO TLB area.
> This size can be influenced using a kernel command line parameter "swiotlb".
> Unfortunately, the parsing of the kernel command line is done _after_ the
> swiotlb is initialized on some architectures.
> 
> This patch adds a new function swiotlb_set_default_size() which can be used
> before swiotlb_init() to indicate the desired IO TLB area size in bytes.
> 
> This will be used later to implement a smaller IO TLB on the Nintendo Wii
> video game console which just comes with 24MB + 64MB of RAM.
> 
> CC: linuxppc-dev@...ts.ozlabs.org
> CC: linux-kernel@...r.kernel.org
> CC: x86@...nel.org
> CC: linux-ia64@...r.kernel.org
> Signed-off-by: Albert Herranz <albert_herranz@...oo.es>
> ---
>  include/linux/swiotlb.h |    2 ++
>  lib/swiotlb.c           |   20 ++++++++++++++++++++
>  2 files changed, 22 insertions(+), 0 deletions(-)

Please fix the powerpc swiotlb initialization instead.

Calling swiotlb_init() before parsing kernel parameters sounds
wrong. Any reasons why you can't fix it?
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