From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH] ARM64: PCI: inherit root controller's dma-coherent
Date: Thu, 27 Nov 2014 10:05:57 +0100 [thread overview]
Message-ID: <9101942.u99uxeQ3XX@wuerfel> (raw)
In-Reply-To: <5E6565C8-E868-4559-978A-681045F3582F@redhat.com>
On Thursday 27 November 2014 02:39:59 Jon Masters wrote:
> We're looking at this at the moment (in addition to having the ACPI specification
> clarified to indicate that there is no safe default assumption, requiring that
> DMA masters always indicate their coherency or otherwise via a _CCA whether true
> or false).
I think for arm64, this should be easy: since ACPI is only for servers, we can
rely on the fact that the devices have cache-coherent DMA all the time. Let's
not over-complicate the ACPI case with all the special hacks we need for embedded.
Arnd
next prev parent reply other threads:[~2014-11-27 9:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-27 5:41 [RFC PATCH] ARM64: PCI: inherit root controller's dma-coherent Ming Lei
2014-11-27 7:39 ` Jon Masters
2014-11-27 9:05 ` Arnd Bergmann [this message]
2014-11-27 11:36 ` Catalin Marinas
2014-11-27 11:53 ` Arnd Bergmann
2014-11-27 9:03 ` Arnd Bergmann
2014-11-27 10:14 ` Ming Lei
2014-11-27 10:22 ` Will Deacon
2014-12-04 3:40 ` Ming Lei
2014-12-05 13:26 ` Grygorii Strashko
2014-12-05 16:05 ` Arnd Bergmann
2014-12-09 2:53 ` Ming Lei
2014-12-10 16:06 ` Arnd Bergmann
2014-12-10 16:23 ` Robin Murphy
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