From: joro@8bytes.org (Joerg Roedel)
To: linux-arm-kernel@lists.infradead.org
Subject: [GIT PULL] iommu: Kill off pgsize_bitmap field from struct iommu_ops
Date: Tue, 31 Mar 2015 16:24:40 +0200 [thread overview]
Message-ID: <20150331142440.GD22683@8bytes.org> (raw)
In-Reply-To: <20150327171946.GL1562@arm.com>
Hi Will,
On Fri, Mar 27, 2015 at 05:19:46PM +0000, Will Deacon wrote:
> Please can you pull the following IOMMU changes for 4.1? They move the
> per-iommu_ops pgsize_bitmap field into the iommu_domain, which allows
> IOMMUs such as the ARM SMMU to support different page sizes within a
> given SoC.
I have some concerns about the direction taken with this patch-set. The
goal for the IOMMU-API is still to have domains that can be attached to
arbitrary devices (even when mappings already exist). But with this
patch-set we move into a direction where a domain can only be used on
IOMMUs that support the page-sizes required by the domain. In the end
this would be visible to the user of the IOMMU-API, which is not what we
want.
I can understand the motivation behind these patches, but we need to
think about how this could work with the desired semantics of the
IOMMU-API.
Joerg
next prev parent reply other threads:[~2015-03-31 14:24 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-27 17:19 [GIT PULL] iommu: Kill off pgsize_bitmap field from struct iommu_ops Will Deacon
2015-03-31 14:24 ` Joerg Roedel [this message]
2015-03-31 14:49 ` Will Deacon
2015-03-31 15:50 ` Alex Williamson
2015-04-01 11:53 ` Will Deacon
2015-04-01 15:53 ` Joerg Roedel
2015-04-01 16:45 ` Alex Williamson
2015-04-01 15:38 ` Joerg Roedel
2015-04-01 17:03 ` Will Deacon
2015-04-01 21:24 ` Joerg Roedel
2015-03-31 16:07 ` Robin Murphy
2015-04-01 13:14 ` David Woodhouse
2015-04-01 13:39 ` Will Deacon
2015-04-01 13:52 ` David Woodhouse
2015-04-01 14:05 ` Will Deacon
2015-04-01 14:28 ` David Woodhouse
2015-04-01 14:39 ` Will Deacon
2015-04-01 14:46 ` David Woodhouse
2015-04-01 16:36 ` Will Deacon
2015-04-01 21:28 ` joro at 8bytes.org
2015-04-02 8:58 ` Will Deacon
2015-04-01 16:51 ` Alex Williamson
2015-04-01 17:50 ` Will Deacon
2015-04-01 18:18 ` Alex Williamson
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