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Subject: Re: [PATCH v3 4/7] of: configure the platform device dma parameters
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
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Date: Tue, 06 May 2014 13:44:38 +1000
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On Mon, 2014-05-05 at 16:28 -0600, Bjorn Helgaas wrote:
> I still wonder whether arm, powerpc, and tile (and I just noticed
> microblaze also has a similar dma_direct_map_page()) could all be
> handled by attaching devices to a generic trivial IOMMU driver
> parameterized with the appropriate constant offset.

On powerpc, the offset is not constant, it can be per-device

Cheers,
Ben.



From mboxrd@z Thu Jan  1 00:00:00 1970
From: benh@kernel.crashing.org (Benjamin Herrenschmidt)
Date: Tue, 06 May 2014 13:44:38 +1000
Subject: [PATCH v3 4/7] of: configure the platform device dma parameters
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To: linux-arm-kernel@lists.infradead.org
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On Mon, 2014-05-05 at 16:28 -0600, Bjorn Helgaas wrote:
> I still wonder whether arm, powerpc, and tile (and I just noticed
> microblaze also has a similar dma_direct_map_page()) could all be
> handled by attaching devices to a generic trivial IOMMU driver
> parameterized with the appropriate constant offset.

On powerpc, the offset is not constant, it can be per-device

Cheers,
Ben.