From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 0/7] Introduce automatic DMA configuration for IOMMU masters
Date: Tue, 02 Sep 2014 14:43:18 +0200 [thread overview]
Message-ID: <3133975.8bg0CLVMMz@wuerfel> (raw)
In-Reply-To: <5405B6F2.1060105@samsung.com>
On Tuesday 02 September 2014 14:24:18 Marek Szyprowski wrote:
> >>> For isolation purposes, it can only help to have more domains, but
> >>> I would guess that there is some space overhead in maintaining lots
> >>> of page tables.
> >> I'm okay with both approaches (separate domain for each device vs. single
> >> common domain for all devices). Maybe this can be some kind of Kconfig
> >> option added to DMA debugging? Separation might be really helpful when
> >> debugging strange device behavior.
> > One potential problem with a single domain is when you have multiple
> > instances of a given IOMMU, each with different hardware restrictions.
> > Then you can end up with multiple sets of page tables for the domain
> > which, although not impossible to work with, is a bit of a mess.
>
> Maybe the default dma-mapping domain should be one per a given IOMMU
> instance?
> This will simplify a lot of things in such case.
Yes, that sounds like a good idea.
Arnd
next prev parent reply other threads:[~2014-09-02 12:43 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 ` [RFC PATCH 0/7] Introduce automatic DMA configuration for IOMMU masters Marek Szyprowski
2014-09-02 8:31 ` 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 [this message]
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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