linux-kernel - Re: [PATCH 00/11] swiotlb: Introduce architecture-specific APIs to replace _

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Date:	Fri, 10 Jul 2009 15:55:56 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Ian Campbell <ian.campbell@...rix.com>
Cc:	linux-kernel@...r.kernel.org,
	Becky Bruce <beckyb@...nel.crashing.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Greg KH <gregkh@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Olaf Kirch <okir@...e.de>, Tony Luck <tony.luck@...el.com>,
	linux-ia64@...r.kernel.org, linuxppc-dev@...abs.org, x86@...nel.org
Subject: Re: [PATCH 00/11] swiotlb: Introduce architecture-specific APIs to
 replace __weak functions (v2)

On Mon, 2009-06-01 at 16:32 +0100, Ian Campbell wrote:
> This series:
> * removes the swiotlb_(arch_)_phys_to_bus and bus_to_phys __weak
>   hooks, replacing them with an architecture-specific phys_to_dma and
>   dma_to_phys interface. These are used by both PowerPC and Xen to
>   provide the correct mapping from physical to DMA addresses.
> * removes the swiotlb_address_needs_mapping and
>   swiotlb_range_needs_mapping __weak functions as well as
>   is_buffer_dma_capable (which should never have been a generic
>   function). All three are replaced by a single architecture-specific
>   interface which meets the needs of both PowerPC and Xen.
> * removes the swiotlb_virt_to_bus __weak function and replaces it with
>   a CONFIG_HIGHMEM compatible version when high memory is in use. This
>   is needed for 32 bit PowerPC swiotlb support.
> * removes the swiotlb_alloc* __weak functions and replaces them with
>   swiotlb_init_with_buffer which allows the use of a caller allocated
>   buffer (and emergency pool).
> 
> I think these new interfaces are cleaner than the existing __weak
> functions and isolate the swiotlb code from architecture internals.
> 
> This series does not contain any Xen or PowerPC specific changes, those
> will follow in separate postings. The complete patchset has been boot
> tested under Xen and native-x86 and compiled for IA64 and PowerPC
> 
> Changes since v1: 
> - Fixed compile error in swiotlb_dma_to_virt highmem version. Moved
>   #ifdef into function to avoid prototype drift.
> - checkpatch fixes.
> - missed a swiotlb_arch_range_needs_mapping in swiotlb.h and x86
>   pci-swiotlb.c and swiotlb_bus_to_phys/phys_to_bus implementations in
>   x86.
> - additionally replaced __weak swiotlb_alloc* with
>   swiotlb_init_with_buffer.

Looks like I was only CCed on part of them... it's not very handy for me
as I end up having some of the patches in one folder and some
elsewhere :-)

I don't have a firm objection but they will have to go through Becky
and Kumar since they are the one who need swiotlb for their embedded
platforms.

Cheers,
Ben.


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