Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy)

H. Peter Anvin
2007-04-26T02:09:38Z

Linus Torvalds wrote:
>
> On Thu, 26 Apr 2007, Pavel Machek wrote:
>> Ok, I guess I'll have nightmares of DMA controllers doing DMAs from
>> chips that are no longer there tonight.
>
> Umm. Welcome to the 21st century: we don't do that "separate DMA
> controller" thing any more. All devices do their own DMA.
>

That was the 1990s. On a brand new server system:

00:08.0 System peripheral: Intel Corporation 5000 Series Chipset DMA
Engine (rev b1)

For better or worse, slave DMA seems to be making a comeback of sorts.
Not to mention all kinds of embedded crap^Whardware with optimized DMA
engines which look nothing like PCI at all.

-hpa