Re: [Qemu-ppc] [Qemu-devel] [RFC 0/2] macio: split out unaligned DMA access into separate functions

[Mark Cave-Ayland]

On 22/05/15 18:55, John Snow wrote:

> On 03/09/2015 06:24 PM, 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>
>>
>>
>> Mark Cave-Ayland (2):
>>   macio: move unaligned DMA read code into separate pmac_dma_read()
>>     function
>>   macio: move unaligned DMA write code into separate pmac_dma_write()
>>     function
>>
>>  hw/ide/macio.c             |  487 
>> +++++++++++++++++++++++---------------------
>>  include/hw/ppc/mac_dbdma.h |    4 -
>>  2 files changed, 254 insertions(+), 237 deletions(-)
>>
> 
> Code fails 32 bit build due to %lx debug prints. I'll edit them
> accordingly if that is OK by you.

Please go right ahead :)  Do you need a proper re-spin without the RFC
prefix? If so, I can make the changes there if that helps?


ATB,

Mark.