From: m.szyprowski@samsung•com (Marek Szyprowski)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC PATCH 0/7] Introduce automatic DMA configuration for IOMMU masters
Date: Tue, 02 Sep 2014 08:26:01 +0200 [thread overview]
Message-ID: <540562F9.2030508@samsung.com> (raw)
In-Reply-To: <1409327670-3495-1-git-send-email-will.deacon@arm.com>
Hi Will,
On 2014-08-29 17:54, Will Deacon wrote:
> This patch series is an RFC to implement IOMMU master configuration into
> of_dma_configure. I haven't yet ported any IOMMU drivers to it, so it
> remains untested, but I wanted to get some early feedback to ensure that
> this doesn't end up going in the wrong direction.
>
> The idea comes out of my understanding following discussions with Arnd
> and David at Kernel Summit / LinuxCon in Chicago. Essentially:
>
> - Allow IOMMUs to be probed early and set up per-instance data on their
> of_node
>
> - Add a new callback to the iommu_ops structure for adding a device
> with a set of opaque IDs (e.g. Stream IDs or Requester IDs)
>
> - Add an of_iommu_configure function, called from of_dma_configure,
> which registers the master IDs with the correspond IOMMU before
> probing the master itself
>
> - Where applicable, create an IOMMU domain per device and swizzle the
> DMA ops for that device to use the IOMMU variants.
>
> I haven't bothered doing anything clever with the DMA masks yet, so I
> wouldn't be surprised if we end up chewing through tonnes of memory
> allocating IOMMU domains that are far too big at the moment. Again, this
> is just an RFC and I'd welcome comments on the general direction of the
> series.
Thanks for your patches, I wasn't aware the fact that you are working on
this. When do you plan to send a second version? I would like to rebase
my Exynos IOMMU patches (https://lkml.org/lkml/2014/8/5/183) on top of
your work, but I wonder if I should select this version as a base or wait
a bit for an update.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
next prev parent reply other threads:[~2014-09-02 6:26 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-29 15:54 [RFC PATCH 0/7] Introduce automatic DMA configuration for IOMMU masters Will Deacon
2014-08-29 15:54 ` [RFC PATCH 1/7] iommu: provide early initialisation hook for IOMMU drivers Will Deacon
2014-09-01 7:52 ` Thierry Reding
2014-09-01 14:31 ` Arnd Bergmann
2014-09-01 16:36 ` Will Deacon
2014-09-02 6:56 ` Laurent Pinchart
2014-09-02 14:47 ` Varun Sethi
2014-09-02 15:04 ` Arnd Bergmann
2014-08-29 15:54 ` [RFC PATCH 2/7] dma-mapping: replace set_arch_dma_coherent_ops with arch_setup_dma_ops Will Deacon
2014-09-01 14:27 ` Arnd Bergmann
2014-09-01 16:20 ` Will Deacon
2014-08-29 15:54 ` [RFC PATCH 3/7] iommu: add new iommu_ops callback for adding a device with a set of IDs Will Deacon
2014-09-01 8:13 ` Thierry Reding
2014-09-01 14:39 ` Arnd Bergmann
2014-09-01 16:34 ` Will Deacon
2014-09-01 17:18 ` Arnd Bergmann
2014-08-29 15:54 ` [RFC PATCH 4/7] iommu: provide helper function to configure an IOMMU for an of master Will Deacon
2014-09-01 8:29 ` Thierry Reding
2014-09-01 14:46 ` Arnd Bergmann
2014-09-01 16:40 ` Will Deacon
2014-09-01 20:18 ` Arnd Bergmann
2014-09-02 10:03 ` Will Deacon
2014-09-02 12:15 ` Arnd Bergmann
2014-09-02 13:05 ` Will Deacon
2014-09-02 14:01 ` Arnd Bergmann
2014-09-02 20:59 ` jroedel at suse.de
2014-09-03 9:45 ` Will Deacon
2014-09-02 15:03 ` Varun Sethi
2014-09-02 15:08 ` Arnd Bergmann
2014-09-02 10:23 ` Laurent Pinchart
2014-09-02 10:51 ` Laurent Pinchart
2014-09-02 11:03 ` Will Deacon
2014-09-02 19:08 ` Laurent Pinchart
2014-09-02 14:55 ` Varun Sethi
2014-08-29 15:54 ` [RFC PATCH 5/7] dma-mapping: detect and configure IOMMU in of_dma_configure Will Deacon
2014-09-01 14:53 ` Arnd Bergmann
2014-08-29 15:54 ` [RFC PATCH 6/7] arm: call iommu_init before of_platform_populate Will Deacon
2014-08-29 15:54 ` [RFC PATCH 7/7] arm: dma-mapping: plumb our iommu mapping ops into arch_setup_dma_ops Will Deacon
2014-09-02 6:26 ` Marek Szyprowski [this message]
2014-09-02 8:31 ` [RFC PATCH 0/7] Introduce automatic DMA configuration for IOMMU masters Will Deacon
2014-09-02 8:48 ` Marek Szyprowski
2014-09-02 8:56 ` Arnd Bergmann
2014-09-02 10:42 ` Marek Szyprowski
2014-09-02 10:57 ` Will Deacon
2014-09-02 12:24 ` Marek Szyprowski
2014-09-02 12:43 ` Arnd Bergmann
2014-09-02 21:50 ` Laurent Pinchart
2014-09-02 12:22 ` Arnd Bergmann
2014-09-02 12:30 ` Marek Szyprowski
2014-09-02 12:46 ` Arnd Bergmann
2014-09-02 13:11 ` Marek Szyprowski
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