RE: DMA from user space buffer/VIPT cache flushing wows (was: Minutes: 21 Sept,09 RMK meeting)

Woodruff, Richard
2009-11-11T19:50:24Z

> From: Russell King [mailto:rmk@arm.linux.org.uk]
> Sent: Wednesday, November 11, 2009 8:30 PM

> It is *not* a generic interface for kernel drivers to use. That's why
> I ignored your comment about kernel interfaces for flusing userspace
> buffers. It's just not relevant to the problem at hand.

It does solve our specific problem. Thanks Russell.

It is several peoples stance it is not the greatest generic API. There isn't any alternate solution yet identified/proposed.

Some architectures like AVR32 do implement the selective flush for the easier icache side of sys_cacheflush.

Regards,
Richard W.