From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: Will Deacon <will.deacon-5wv7dgnIgG8@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>
Subject: Re: [PATCHv3 1/3] ARM: mm: allow sub-architectures to override PCI I/O memory type
Date: Mon, 19 May 2014 19:04:24 +0200 [thread overview]
Message-ID: <6041406.aOYqt5yzTp@wuerfel> (raw)
In-Reply-To: <20140519165010.GQ15130-5wv7dgnIgG8@public.gmane.org>
On Monday 19 May 2014 17:50:10 Will Deacon wrote:
> 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.
That was my idea. I'm fine with it either way, with the dsb or without it.
Let's see what Russell thinks about this, he probably has a preference.
Arnd
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next prev parent reply other threads:[~2014-05-19 17:04 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-15 9:18 [PATCHv3 0/3] ARM: implement workaround for Cortex-A9/PL310/PCIe deadlock Thomas Petazzoni
[not found] ` <1400145519-28530-1-git-send-email-thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-05-15 9:18 ` [PATCHv3 1/3] ARM: mm: allow sub-architectures to override PCI I/O memory type Thomas Petazzoni
[not found] ` <1400145519-28530-2-git-send-email-thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-05-15 13:21 ` Arnd Bergmann
2014-05-15 13:51 ` Thomas Petazzoni
[not found] ` <20140515155130.193c3181-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-05-15 14:29 ` Will Deacon
[not found] ` <20140515142924.GI27594-5wv7dgnIgG8@public.gmane.org>
2014-05-15 14:32 ` Arnd Bergmann
2014-05-15 15:34 ` Will Deacon
[not found] ` <20140515153430.GM27594-5wv7dgnIgG8@public.gmane.org>
2014-05-15 15:55 ` Arnd Bergmann
2014-05-16 9:53 ` Will Deacon
[not found] ` <20140516095333.GE12341-5wv7dgnIgG8@public.gmane.org>
2014-05-19 13:19 ` Arnd Bergmann
2014-05-19 14:23 ` Will Deacon
[not found] ` <20140519142355.GD15130-5wv7dgnIgG8@public.gmane.org>
2014-05-19 16:40 ` Arnd Bergmann
2014-05-19 16:50 ` Will Deacon
[not found] ` <20140519165010.GQ15130-5wv7dgnIgG8@public.gmane.org>
2014-05-19 17:04 ` Arnd Bergmann [this message]
2014-05-21 5:20 ` Jason Gunthorpe
[not found] ` <20140521052007.GA14888-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2014-05-21 8:20 ` Arnd Bergmann
2014-05-15 17:53 ` Jason Gunthorpe
[not found] ` <20140515175307.GA12259-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2014-05-16 9:57 ` Will Deacon
[not found] ` <20140516095736.GF12341-5wv7dgnIgG8@public.gmane.org>
2014-05-16 15:33 ` Jason Gunthorpe
2014-05-15 9:18 ` [PATCHv3 2/3] ARM: mm: add support for HW coherent systems in PL310 Thomas Petazzoni
[not found] ` <1400145519-28530-3-git-send-email-thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-05-15 9:36 ` Catalin Marinas
2014-05-15 11:39 ` Thomas Petazzoni
2014-05-15 13:23 ` Arnd Bergmann
2014-05-15 13:35 ` Rob Herring
[not found] ` <CAL_JsqJZDhi8qtzSbDAdkN3BQqdZQZtRcC-yha+QsreLFpaNRQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-15 13:46 ` Thomas Petazzoni
2014-05-15 9:18 ` [PATCHv3 3/3] ARM: mvebu: implement L2/PCIe deadlock workaround Thomas Petazzoni
2014-05-15 9:36 ` Catalin Marinas
[not found] ` <1400145519-28530-4-git-send-email-thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-05-15 13:21 ` Jason Cooper
[not found] ` <20140515132118.GK27822-u4khhh1J0LxI1Ri9qeTfzeTW4wlIGRCZ@public.gmane.org>
2014-05-15 13:50 ` Thomas Petazzoni
[not found] ` <20140515155008.1dcca042-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2014-05-15 15:31 ` Jason Cooper
[not found] ` <20140515153150.GP27822-u4khhh1J0LxI1Ri9qeTfzeTW4wlIGRCZ@public.gmane.org>
2014-05-16 7:19 ` Thomas Petazzoni
2014-05-15 13:26 ` Arnd Bergmann
2014-05-15 14:22 ` Thomas Petazzoni
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