From: "jroedel-l3A5Bk7waGM@public.gmane.org" <jroedel-l3A5Bk7waGM@public.gmane.org>
To: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Cc: "arnd-r2nGTMty4D4@public.gmane.org"
<arnd-r2nGTMty4D4@public.gmane.org>,
"iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
Thierry Reding
<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Laurent Pinchart
<laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>,
"Varun.Sethi-KZfg59tc24xl57MIdRCFDg@public.gmane.org"
<Varun.Sethi-KZfg59tc24xl57MIdRCFDg@public.gmane.org>,
"dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org"
<dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: [RFC PATCH v3 5/7] dma-mapping: detect and configure IOMMU in of_dma_configure
Date: Mon, 27 Oct 2014 17:33:57 +0100 [thread overview]
Message-ID: <20141027163357.GF9734@suse.de> (raw)
In-Reply-To: <20141027160216.GY8768-5wv7dgnIgG8@public.gmane.org>
On Mon, Oct 27, 2014 at 04:02:16PM +0000, Will Deacon wrote:
> On Mon, Oct 27, 2014 at 11:30:33AM +0000, Laurent Pinchart wrote:
> > I'm not sure to follow you here. Aren't we already exposing masters that
> > master through multiple IOMMUs as single instances of struct device ?
>
> Hmm, yes, now you've confused me too! The conclusion was certainly that
> dma-mapping should not be the one dealing with the I/O topology. Domain
> allocation would then be an iommu callback (something like
> ->get_default_domain), but the rest of the details weren't fleshed out.
The idea is that the IOMMU core code will allocate a default domain for
each iommu-group at initialization time. This domain can be requested
later by a new iommu-api function and used for DMA-API mappings.
A device still can be assigned to another domain by driver code (like
VFIO). But if the device is later de-assigned the IOMMU core-code
automatically puts it back into the default domain.
Joerg
next prev parent reply other threads:[~2014-10-27 16:33 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-12 16:34 [RFC PATCH v3 0/7] Introduce automatic DMA configuration for IOMMU masters Will Deacon
[not found] ` <1410539695-29128-1-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2014-09-12 16:34 ` [RFC PATCH v3 1/7] iommu: provide early initialisation hook for IOMMU drivers Will Deacon
2014-09-18 14:31 ` Robin Murphy
[not found] ` <541AECDA.1000805-5wv7dgnIgG8@public.gmane.org>
2014-09-22 17:35 ` Will Deacon
2014-09-12 16:34 ` [RFC PATCH v3 2/7] dma-mapping: replace set_arch_dma_coherent_ops with arch_setup_dma_ops Will Deacon
2014-09-12 16:34 ` [RFC PATCH v3 3/7] iommu: add new iommu_ops callback for adding an OF device Will Deacon
[not found] ` <1410539695-29128-4-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2014-09-15 11:57 ` Marek Szyprowski
[not found] ` <5416D432.8020107-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2014-09-17 1:39 ` Will Deacon
2014-09-12 16:34 ` [RFC PATCH v3 4/7] iommu: provide helper function to configure an IOMMU for an of master Will Deacon
[not found] ` <1410539695-29128-5-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2014-09-18 11:13 ` Laurent Pinchart
2014-09-22 17:13 ` Will Deacon
[not found] ` <20140922171352.GF7936-5wv7dgnIgG8@public.gmane.org>
2014-10-14 13:12 ` Laurent Pinchart
2014-09-12 16:34 ` [RFC PATCH v3 5/7] dma-mapping: detect and configure IOMMU in of_dma_configure Will Deacon
[not found] ` <1410539695-29128-6-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2014-09-18 11:17 ` Laurent Pinchart
2014-09-22 9:29 ` Thierry Reding
2014-09-22 17:50 ` Will Deacon
[not found] ` <20140922175027.GK7936-5wv7dgnIgG8@public.gmane.org>
2014-10-14 12:53 ` Laurent Pinchart
2014-10-27 10:51 ` Will Deacon
[not found] ` <20141027105158.GE8768-5wv7dgnIgG8@public.gmane.org>
2014-10-27 11:12 ` Marek Szyprowski
2014-10-27 11:30 ` Laurent Pinchart
2014-10-27 16:02 ` Will Deacon
[not found] ` <20141027160216.GY8768-5wv7dgnIgG8@public.gmane.org>
2014-10-27 16:33 ` jroedel-l3A5Bk7waGM [this message]
2014-09-22 17:46 ` Will Deacon
2014-09-12 16:34 ` [RFC PATCH v3 6/7] arm: call iommu_init before of_platform_populate Will Deacon
[not found] ` <1410539695-29128-7-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2014-09-22 9:36 ` Thierry Reding
2014-09-22 11:08 ` Arnd Bergmann
2014-09-22 11:40 ` Thierry Reding
2014-09-22 16:03 ` Arnd Bergmann
2014-09-23 7:02 ` Thierry Reding
2014-09-23 7:44 ` Arnd Bergmann
2014-09-23 8:59 ` Thierry Reding
2014-10-14 13:07 ` Laurent Pinchart
2014-10-14 13:20 ` Arnd Bergmann
2014-10-14 13:37 ` Thierry Reding
2014-10-14 15:01 ` Laurent Pinchart
2014-10-14 15:05 ` Thierry Reding
2014-10-14 15:10 ` Laurent Pinchart
2014-09-12 16:34 ` [RFC PATCH v3 7/7] arm: dma-mapping: plumb our iommu mapping ops into arch_setup_dma_ops Will Deacon
[not found] ` <1410539695-29128-8-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2014-09-22 9:19 ` Thierry Reding
2014-09-22 9:22 ` Laurent Pinchart
2014-09-22 17:43 ` Will Deacon
[not found] ` <20140922174337.GI7936-5wv7dgnIgG8@public.gmane.org>
2014-09-23 7:14 ` Thierry Reding
2014-09-24 16:33 ` Will Deacon
[not found] ` <20140924163338.GF16244-5wv7dgnIgG8@public.gmane.org>
2014-09-25 6:40 ` Thierry Reding
2014-09-30 16:00 ` Will Deacon
[not found] ` <20140930160035.GM2548-5wv7dgnIgG8@public.gmane.org>
2014-10-01 8:46 ` Thierry Reding
2014-10-03 15:08 ` Will Deacon
[not found] ` <20141003150850.GA32451-5wv7dgnIgG8@public.gmane.org>
2014-10-06 9:52 ` Thierry Reding
2014-10-06 10:50 ` Laurent Pinchart
2014-10-06 13:05 ` Thierry Reding
2014-09-16 11:40 ` [RFC PATCH v3 0/7] Introduce automatic DMA configuration for IOMMU masters Robin Murphy
[not found] ` <541821AB.8040403-5wv7dgnIgG8@public.gmane.org>
2014-09-17 1:19 ` Will Deacon
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