[Cbe-oss-dev] powerpc/ps3: ps3vram driver for accessing video RAM as MTD

[Geoff Levand]

Hi David,

Jim Paris wrote:
> Add ps3vram driver, which exposes unused video RAM on the PS3 as a MTD
> device suitable for storage or swap.  Fast data transfer is achieved
> using a local cache in system RAM and DMA transfers via the GPU.
> 
> Signed-off-by: Vivien Chappelier <vivien.chappelier at free.fr>
> CC: Geert Uytterhoeven <Geert.Uytterhoeven at sonycom.com>
> CC: Geoff Levand <geoffrey.levand at am.sony.com>
> Signed-off-by: Jim Paris <jim at jtan.com>


Acked-by: Geoff Levand <geoffrey.levand at am.sony.com>


> ---
> This version has been updated to work with PS3 firmware 2.50, and
> to use ps3_gpu_mutex.
> 
> Please consider for 2.6.29.
> 
>  MAINTAINERS                              |    6 
>  arch/powerpc/include/asm/ps3.h           |    1 
>  arch/powerpc/platforms/ps3/device-init.c |   37 +
>  drivers/mtd/devices/Kconfig              |    7 
>  drivers/mtd/devices/Makefile             |    1 
>  drivers/mtd/devices/ps3vram.c            |  776 +++++++++++++++++++++++++++++++
>  6 files changed, 828 insertions(+)
>  create mode 100644 drivers/mtd/devices/ps3vram.c

I tested this on PS3 and it both fixes the memory corruption
problem and works with firmware 2.50, so I think it is ready
for 2.6.29.

David, please check the ps3vram mtd part and and give comments.

Since this patch is dependent on Geert's ps3_gpu_mutex patch
'powerpc/ps3: Replace the flip_ctl logic in ps3av and ps3fb by a mutex'
I recently posted to linuxppc-dev, I think just an Acked-by for the
mtd part is enough, and I can then repost this patch to linuxppc-dev
and ask Paul to merge it with the ps3_gpu_mutex patch.

-Geoff