From: David Miller <davem@davemloft.net>
To: benh@kernel.crashing.org
Cc: sfr@canb.auug.org.au, paulus@samba.org,
linuxppc-dev@lists.ozlabs.org, mika.westerberg@linux.intel.com,
netdev@vger.kernel.org, linux-next@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: linux-next: build failure after merge of the final tree (net-next tree related)
Date: Thu, 20 Sep 2012 18:53:15 -0400 (EDT) [thread overview]
Message-ID: <20120920.185315.576326460331670020.davem@davemloft.net> (raw)
In-Reply-To: <1348179764.1132.35.camel@pasglop>
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 21 Sep 2012 08:22:44 +1000
> Hrm, that's ancient gunk, I'll have to dig. We potentially can support
> ISA devices DMA'ing from an ISA bridge... but via the iommu, which means
> isa_virt_to_bus is a non-starter.
>
> But then, do we really care ? IE. Is there single device that actually
> requires ISA_DMA_API and that is expected to work on any currently
> supported powerpc hw ? :-)
>
> We don't even support PReP anymore, so that leaves us with what ?
ISA_DMA_API implies a fixed window of addresses which are <= 32-bits
on the bus, which is a hardware requirement of these devices.
isa_virt_to_bus() goes to that physical address, and the expection is
that you use GFP_DMA and thus the physical addresses fit inside of
an unsigned int.
isa_virt_to_bus() basically amounts to a virt-->phys plus a cast.
> Anybody has an objection to turning ISA_DMA_API off ?
Then you can remove all of the DMA api stuff in powerpc's asm/dma.h
but some of it looks like it might be in use.
next prev parent reply other threads:[~2012-09-20 22:53 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-20 7:36 linux-next: build failure after merge of the final tree (net-next tree related) Stephen Rothwell
2012-09-20 9:10 ` Mika Westerberg
2012-09-20 20:45 ` David Miller
2012-09-20 22:15 ` Stephen Rothwell
2012-09-20 22:22 ` Benjamin Herrenschmidt
2012-09-20 22:53 ` David Miller [this message]
2012-09-21 21:46 ` Benjamin Herrenschmidt
2012-09-22 20:00 ` David Miller
2012-09-22 21:20 ` Benjamin Herrenschmidt
2012-09-20 22:28 ` Stephen Rothwell
2012-09-21 1:37 ` Stephen Rothwell
-- strict thread matches above, loose matches on Subject: below --
2014-03-18 7:27 Stephen Rothwell
2014-03-19 3:13 ` David Miller
2014-03-17 10:21 Stephen Rothwell
2014-03-19 3:11 ` David Miller
2014-03-17 10:13 Stephen Rothwell
2013-09-02 9:11 Stephen Rothwell
2013-09-02 9:18 ` Cong Wang
2013-07-03 7:48 Stephen Rothwell
2013-07-03 7:51 ` Sedat Dilek
2013-07-03 8:45 ` Eliezer Tamir
2013-07-03 19:17 ` David Miller
2013-06-26 7:56 Stephen Rothwell
2013-06-26 8:07 ` Alexey Brodkin
2013-06-26 8:36 ` David Miller
2013-04-23 7:46 Stephen Rothwell
2013-04-23 17:10 ` David Miller
2013-04-23 23:44 ` David Rientjes
2013-04-12 6:00 Stephen Rothwell
2013-04-12 7:08 ` David Miller
2013-03-28 5:04 Stephen Rothwell
2013-03-28 5:19 ` David Miller
2013-01-03 3:23 Stephen Rothwell
2013-01-03 3:28 ` David Miller
2013-01-03 9:51 ` David Miller
2012-09-05 5:39 Stephen Rothwell
2012-09-05 21:46 ` David Miller
2012-09-04 6:58 Stephen Rothwell
2012-09-04 18:20 ` David Miller
2012-09-04 19:50 ` Jerry Chu
2012-07-22 6:34 Stephen Rothwell
2012-07-22 7:29 ` Jiri Pirko
2012-05-03 6:16 Stephen Rothwell
2012-05-03 6:26 ` David Miller
2012-04-30 5:58 Stephen Rothwell
2012-04-30 17:22 ` David Miller
2012-04-19 6:28 Stephen Rothwell
2012-04-19 6:40 ` David Miller
2012-04-10 5:29 Stephen Rothwell
2012-04-10 13:26 ` David Miller
2012-04-05 3:25 Stephen Rothwell
2012-04-05 3:59 ` David Miller
2012-04-06 7:09 ` Giuseppe CAVALLARO
2012-04-06 7:30 ` Giuseppe CAVALLARO
2012-02-20 5:15 Stephen Rothwell
2012-02-20 5:46 ` David Miller
2011-12-14 7:07 Stephen Rothwell
2011-12-14 18:35 ` David Miller
2011-11-23 4:00 Stephen Rothwell
2011-11-23 12:09 ` Neil Horman
2011-11-23 23:02 ` Andrew Morton
2011-11-23 23:44 ` David Miller
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