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From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [GIT PULL v3] updates to qbman (soc drivers) to support arm/arm64
Date: Tue, 27 Jun 2017 12:35:49 +0200	[thread overview]
Message-ID: <CAK8P3a0EXGfkijeQG6OKGHeS8LZsO4YFmRhN9WXTei51rj6G1A@mail.gmail.com> (raw)
In-Reply-To: <20170627091006.GN4902@n2100.armlinux.org.uk>

On Tue, Jun 27, 2017 at 11:10 AM, Russell King - ARM Linux
<linux@armlinux.org.uk> wrote:
> On Tue, Jun 27, 2017 at 11:05:38AM +0200, Arnd Bergmann wrote:
>> On Tue, Jun 27, 2017 at 10:17 AM, Russell King - ARM Linux
>> <linux@armlinux.org.uk> wrote:
>>
>> I wonder if doing memcpy_toio on the write-combining mapping
>> will do what Roy wants and and up sending a single bus transaction
>> for one descriptor most of the time, while fitting in with the ioremap_wc()
>> interface and its __iomem pointers.
>
> Either the CE region needs __iomem pointers and proper accessors, or
> it needs to be using memremap(offset, size, MEMREMAP_WC) and not use
> the iomem accessors.

Right, memremap() would work here as well. If there are no other constraints,
using ioremap_wc and __iomem pointers would have the advantage of giving
us a little more type safety, but it depends on what operations we actually
need to do on the data.

        Arnd

  reply	other threads:[~2017-06-27 10:35 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-20 17:27 [GIT PULL v3] updates to qbman (soc drivers) to support arm/arm64 Leo Li
2017-06-23 14:56 ` Arnd Bergmann
2017-06-23 15:22   ` Mark Rutland
2017-06-23 15:55     ` Russell King - ARM Linux
2017-06-23 16:23       ` Mark Rutland
2017-06-23 19:39       ` Roy Pledge
2017-06-23 18:58     ` Roy Pledge
2017-06-24 12:10       ` Russell King - ARM Linux
2017-06-27 18:36         ` Roy Pledge
2017-06-27  7:17       ` Arnd Bergmann
2017-06-27  8:17         ` Russell King - ARM Linux
2017-06-27  9:05           ` Arnd Bergmann
2017-06-27  9:10             ` Russell King - ARM Linux
2017-06-27 10:35               ` Arnd Bergmann [this message]
2017-06-27 19:03                 ` Roy Pledge
2017-06-27 18:59         ` Roy Pledge
2017-06-23 15:38   ` Russell King - ARM Linux
2017-06-23 19:25     ` Roy Pledge

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