linux-kernel - Re: [PATCH v2 1/7] swiotlb: Make io_tlb_end a physical address instead of a virtual one

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Date:	Sat, 13 Oct 2012 20:52:57 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	konrad.wilk@...cle.com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, rob@...dley.net, akpm@...ux-foundation.org,
	joerg.roedel@....com, bhelgaas@...gle.com, shuahkhan@...il.com,
	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH v2 1/7] swiotlb: Make io_tlb_end a physical address
 instead of a virtual one

Hi Alexander,

On Fri, Oct 12, 2012 at 4:34 AM, Alexander Duyck
<alexander.h.duyck@...el.com> wrote:
> This change replaces all references to the virtual address for io_tlb_end
> with references to the physical address io_tlb_end.  The main advantage of
> replacing the virtual address with a physical address is that we can avoid
> having to do multiple translations from the virtual address to the physical
> one needed for testing an existing DMA address.
>
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> ---
>
>  lib/swiotlb.c |   24 +++++++++++++-----------
>  1 files changed, 13 insertions(+), 11 deletions(-)
>
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index f114bf6..19aac9f 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c
> @@ -57,7 +57,8 @@ int swiotlb_force;
>   * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
>   * API.
>   */
> -static char *io_tlb_start, *io_tlb_end;
> +static char *io_tlb_start;
> +phys_addr_t io_tlb_end;

If add io_tlb_start_phy and io_tlb_end_phy, could we get same results
with less hunks?

Hillf
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