[PATCH v4 05/11] swiotlb: add swiotlb_set_default_size()

[FUJITA Tomonori]

On Fri, 12 Mar 2010 20:12:40 +0100
Albert Herranz <albert_herranz at yahoo.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 at lists.ozlabs.org
> CC: linux-kernel at vger.kernel.org
> CC: x86 at kernel.org
> CC: linux-ia64 at vger.kernel.org
> Signed-off-by: Albert Herranz <albert_herranz at yahoo.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?