From owner-svn-src-all@FreeBSD.ORG  Tue May 12 21:28:15 2009
Return-Path: <owner-svn-src-all@FreeBSD.ORG>
Delivered-To: svn-src-all@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 9FF8C1065673;
	Tue, 12 May 2009 21:28:15 +0000 (UTC)
	(envelope-from marius@alchemy.franken.de)
Received: from alchemy.franken.de (alchemy.franken.de [194.94.249.214])
	by mx1.freebsd.org (Postfix) with ESMTP id 2F4438FC08;
	Tue, 12 May 2009 21:28:14 +0000 (UTC)
	(envelope-from marius@alchemy.franken.de)
Received: from alchemy.franken.de (localhost [127.0.0.1])
	by alchemy.franken.de (8.14.3/8.14.3/ALCHEMY.FRANKEN.DE) with ESMTP id
	n4CLSDtJ052222; Tue, 12 May 2009 23:28:13 +0200 (CEST)
	(envelope-from marius@alchemy.franken.de)
Received: (from marius@localhost)
	by alchemy.franken.de (8.14.3/8.14.3/Submit) id n4CLSDj7052221;
	Tue, 12 May 2009 23:28:13 +0200 (CEST) (envelope-from marius)
Date: Tue, 12 May 2009 23:28:13 +0200
From: Marius Strobl <marius@alchemy.franken.de>
To: Robert Noland <rnoland@FreeBSD.org>
Message-ID: <20090512212813.GF1158@alchemy.franken.de>
References: <200905122056.n4CKuYpZ032804@svn.freebsd.org>
	<1242162786.1755.51.camel@balrog.2hip.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1242162786.1755.51.camel@balrog.2hip.net>
User-Agent: Mutt/1.4.2.3i
Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org,
	src-committers@FreeBSD.org
Subject: Re: svn commit: r192026 - head/share/man/man9
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
	user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 12 May 2009 21:28:16 -0000

On Tue, May 12, 2009 at 04:13:06PM -0500, Robert Noland wrote:
> On Tue, 2009-05-12 at 20:56 +0000, Marius Strobl wrote:
> > Author: marius
> > Date: Tue May 12 20:56:34 2009
> > New Revision: 192026
> > URL: http://svn.freebsd.org/changeset/base/192026
> > 
> > Log:
> >   Correct r190283 (partially reverting it) as on sparc64 BUS_DMA_NOCACHE
> >   actually is only valid for bus_dmamap_load().
> 
> Ok, this is getting very confusing...  This means that code has to set
> this flag on both alloc and load to allow for somethine resembling
> consistent behavior.
> 

Personally I don't understand why amd64 and i386 where decided to
implement BUS_DMA_NOCACHE for bus_dmamem_alloc(9) only as this
is less flexible than using it with bus_dmamap_load(9) (which also
is the older existing implementation). Anyway, <sys/bus_dma.h>
documents BUS_DMA_NOCACHE and BUS_DMA_NOWRITE as "non-standard or
specific to only certain architectures" so I think it's okay for
the usage of these flags to differ across them.

Marius