From mboxrd@z Thu Jan  1 00:00:00 1970
From: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Subject: Re: [PATCHv3 1/3] ARM: mm: allow sub-architectures to override PCI
 I/O memory type
Date: Mon, 19 May 2014 17:50:10 +0100
Message-ID: <20140519165010.GQ15130@arm.com>
References: <1400145519-28530-1-git-send-email-thomas.petazzoni@free-electrons.com>
 <66413148.lBD9c9XUns@wuerfel>
 <20140519142355.GD15130@arm.com>
 <4669695.sl9JY8Fb9h@wuerfel>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Return-path: <devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Content-Disposition: inline
In-Reply-To: <4669695.sl9JY8Fb9h@wuerfel>
Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Cc: "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, Thomas Petazzoni <thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>, "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>, Jason Cooper <jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org>, Tawfik Bayouk <tawfik-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>, Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>, Catalin Marinas <Catalin.Marinas-5wv7dgnIgG8@public.gmane.org>, Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>, Albin Tonnerre <Albin.Tonnerre-5wv7dgnIgG8@public.gmane.org>, Lior Amsalem <alior-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>, Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Ezequiel Garcia <ezequiel.garcia-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>, Gregory Clement <gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>, Nadav Haklai <nadavh-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>, Sebastian Hesselbarth <sebastian.hesselbarth-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
List-Id: devicetree@vger.kernel.org

On Mon, May 19, 2014 at 05:40:51PM +0100, Arnd Bergmann wrote:
> On Monday 19 May 2014 15:23:55 Will Deacon wrote:
> > Fair enough -- I just don't think we should dress up an erratum workaround as
> > a bug fix, especially when it's adding a new user of strongly-ordered memory
> > to the kernel which we can't honour for arm64.
> 
> Makes sense. How about a patch then that just changes the memory type for
> the I/O space and adds a comment explaining all we found out? From what
> I can tell, strict ordering is required for Armada 3xx, may or may not
> be required elsewhere but should never hurt noticeably. We may want to restrict
> it to ARMv6/v7 so we don't have to pick the right domain.

Ok, and we don't bother with the extra dsb in outb? I'm alright with that if
the comment goes into enough detail.

Will
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html