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Re: [Qemu-ppc] [RFC 0/2] macio: split out unaligned DMA access into sepa
From: |
Alexander Graf |
Subject: |
Re: [Qemu-ppc] [RFC 0/2] macio: split out unaligned DMA access into separate functions |
Date: |
Tue, 17 Mar 2015 08:23:44 +0100 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
On 09.03.15 23:24, Mark Cave-Ayland wrote:
> This patchset attempts to separate out the IDE/ATAPI logic from the unaligned
> DMA access logic for macio which provides the following benefits:
>
> 1) Reduced code complexity
>
> The existing macio IDE/ATAPI functions were becoming extremely difficult to
> follow through the various callbacks. By splitting up the functions in this
> way it becomes much easier to follow the DMA-specific sections of code.
>
> 2) Future-proofing
>
> If/when the block layer becomes able to handle unaligned DMA accesses directly
> then it should be possible to switch out pmac_dma_read() and pmac_dma_write()
> with their unaligned-capable bdrv_*() equivalents without having to change any
> other logic.
>
> 3) Fix intermittent CDROM detection under -M g3beige
>
> The code refactoring now correctly handles non-block ATAPI transfers which
> fixes the problem with intermittent CDROM detection with Darwin under
> -M g3beige.
>
> Signed-off-by: Mark Cave-Ayland <address@hidden>
Works for me, I'd still prefer to just see unaligned bdrv_*() functions
and remove most of the logic we have here.
Either way, I think this is a reasonable intermediate step.
Alex