From: Will Deacon <will.deacon@arm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "ksummit-discuss@lists.linuxfoundation.org"
<ksummit-discuss@lists.linuxfoundation.org>
Subject: Re: [Ksummit-discuss] [TECH TOPIC] Semantics of MMIO mapping attributes accross archs
Date: Tue, 7 Jul 2015 11:29:21 +0100 [thread overview]
Message-ID: <20150707102921.GF23879@arm.com> (raw)
In-Reply-To: <20150707095615.GD23879@arm.com>
On Tue, Jul 07, 2015 at 10:56:15AM +0100, Will Deacon wrote:
> As long as the accessors are required to enforce ordering that the
> underlying memory type is incapable of providing, I don't see what we
> could do to solve this (somehow make readX/writeX behaviour dependent on
> the pointer?).
... which we could do using pointer tags, but christ is that going to be
confusing to use (casting an io-relaxed pointer to order against DMA!).
Will
next prev parent reply other threads:[~2015-07-07 10:29 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-04 8:17 [Ksummit-discuss] [TECH TOPIC] Semantics of MMIO mapping attributes accross archs Benjamin Herrenschmidt
2015-07-04 14:12 ` Dan Williams
2015-07-05 3:02 ` Benjamin Herrenschmidt
2015-07-05 18:55 ` Andy Lutomirski
2015-07-05 19:56 ` Benjamin Herrenschmidt
2015-07-05 20:09 ` Andy Lutomirski
2015-07-06 9:33 ` Will Deacon
2015-07-06 22:02 ` Benjamin Herrenschmidt
2015-07-07 9:56 ` Will Deacon
2015-07-07 10:29 ` Will Deacon [this message]
2015-07-06 9:52 ` Catalin Marinas
2015-07-06 17:14 ` Andy Lutomirski
2015-07-06 22:04 ` Benjamin Herrenschmidt
2015-07-06 19:11 ` Luck, Tony
2015-07-07 0:01 ` Luis R. Rodriguez
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