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From: Joerg Roedel <joro@8bytes.org>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
	iommu@lists.linux-foundation.org,
	linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linaro-mm-sig@lists.linaro.org, Arnd Bergmann <arnd@arndb.de>,
	Shaik Ameer Basha <shaik.ameer@samsung.com>,
	Cho KyongHo <pullip.cho@samsung.com>,
	Thierry Reding <treding@nvidia.com>,
	Olof Johansson <olof@lixom.net>, Rob Herring <robh@kernel.org>,
	Will Deacon <will.deacon@arm.com>,
	David Wodhouse <dwmw2@infradead.org>,
	Inki Dae <inki.dae@samsung.com>, Kukjin Kim <kgene@kernel.org>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Joonyoung Shim <jy0922.shim@samsung.com>,
	Seung-Woo Kim <sw0312.kim@samsung.com>
Subject: Re: [PATCH v5 11/18] iommu: exynos: remove useless device_add/remove callbacks
Date: Mon, 26 Jan 2015 14:47:01 +0100	[thread overview]
Message-ID: <20150126134701.GH30345@8bytes.org> (raw)
In-Reply-To: <1589480.9kxdoXKkuz@avalon>

Hi Laurent,

On Mon, Jan 26, 2015 at 03:03:57PM +0200, Laurent Pinchart wrote:
> On Monday 26 January 2015 12:00:59 Joerg Roedel wrote:
> > My plan is to make IOMMU groups mandatory. I am currently preparing and
> > RFC patch-set to introduce default-domains (which will be per group). So
> > when all IOMMU drivers are converted to make use of default domains the
> > iommu groups will be mandatory.
> 
> Could the default domain policy be configured by the IOMMU driver ? The ipmmu-
> vmsa driver supports four domains only, and serves up to 32 masters, with one 
> group per master. A default of one domain per group wouldn't be usable.

I guess this limitation is a property of the iommu hardware. I currently
have no support for this in the patch-set, but I think it is easy (and
the best way) to support a model where we have only one default domain
for all groups. This is not in the patch set right now, but will be
added at some point.


	Joerg

WARNING: multiple messages have this Message-ID (diff)
From: joro@8bytes.org (Joerg Roedel)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 11/18] iommu: exynos: remove useless device_add/remove callbacks
Date: Mon, 26 Jan 2015 14:47:01 +0100	[thread overview]
Message-ID: <20150126134701.GH30345@8bytes.org> (raw)
In-Reply-To: <1589480.9kxdoXKkuz@avalon>

Hi Laurent,

On Mon, Jan 26, 2015 at 03:03:57PM +0200, Laurent Pinchart wrote:
> On Monday 26 January 2015 12:00:59 Joerg Roedel wrote:
> > My plan is to make IOMMU groups mandatory. I am currently preparing and
> > RFC patch-set to introduce default-domains (which will be per group). So
> > when all IOMMU drivers are converted to make use of default domains the
> > iommu groups will be mandatory.
> 
> Could the default domain policy be configured by the IOMMU driver ? The ipmmu-
> vmsa driver supports four domains only, and serves up to 32 masters, with one 
> group per master. A default of one domain per group wouldn't be usable.

I guess this limitation is a property of the iommu hardware. I currently
have no support for this in the patch-set, but I think it is easy (and
the best way) to support a model where we have only one default domain
for all groups. This is not in the patch set right now, but will be
added at some point.


	Joerg

  reply	other threads:[~2015-01-26 13:47 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-23 15:51 [PATCH v5 00/18] Exynos SYSMMU (IOMMU) integration with DT and DMA-mapping subsystem Marek Szyprowski
2015-01-23 15:51 ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 01/18] drm: exynos: detach from default dma-mapping domain on init Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 02/18] arm: exynos: pm_domains: add support for devices registered before arch_initcall Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 03/18] ARM: dts: exynos4: add sysmmu nodes Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 05/18] ARM: dts: exynos5420: " Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-02-22 18:00   ` Andreas Färber
2015-02-22 18:00     ` Andreas Färber
2015-01-23 15:51 ` [PATCH v5 06/18] iommu: exynos: don't read version register on every tlb operation Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 07/18] iommu: exynos: remove unused functions Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 08/18] iommu: exynos: remove useless spinlock Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 09/18] iommu: exynos: refactor function parameters to simplify code Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 10/18] iommu: exynos: remove unused functions, part 2 Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 11/18] iommu: exynos: remove useless device_add/remove callbacks Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-25 15:38   ` Laurent Pinchart
2015-01-25 15:38     ` Laurent Pinchart
2015-01-26 11:00     ` Joerg Roedel
2015-01-26 11:00       ` Joerg Roedel
     [not found]       ` <20150126110059.GC30345-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2015-01-26 11:09         ` Will Deacon
2015-01-26 11:09           ` Will Deacon
2015-01-26 12:06         ` Marek Szyprowski
2015-01-26 12:06           ` Marek Szyprowski
2015-01-26 13:03         ` Laurent Pinchart
2015-01-26 13:03           ` Laurent Pinchart
2015-01-26 13:47           ` Joerg Roedel [this message]
2015-01-26 13:47             ` Joerg Roedel
2015-01-23 15:51 ` [PATCH v5 12/18] iommu: exynos: add support for binding more than one sysmmu to master device Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 13/18] iommu: exynos: add support for runtime_pm Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 14/18] iommu: exynos: rename variables to reflect their purpose Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 15/18] iommu: exynos: document internal structures Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 16/18] iommu: exynos: remove excessive includes and sort others alphabetically Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 17/18] iommu: exynos: init from dt-specific callback instead of initcall Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
2015-01-23 15:51 ` [PATCH v5 18/18] iommu: exynos: add callback for initializing devices from device tree Marek Szyprowski
2015-01-23 15:51   ` Marek Szyprowski
     [not found] ` <1422028288-891-1-git-send-email-m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2015-01-23 15:51   ` [PATCH v5 04/18] ARM: dts: exynos5250: add sysmmu nodes Marek Szyprowski
2015-01-23 15:51     ` Marek Szyprowski
2015-01-27  6:25     ` Hongbo Zhang
2015-01-27  6:25       ` Hongbo Zhang
2015-02-22 17:58     ` Andreas Färber
2015-02-22 17:58       ` Andreas Färber
2015-02-04  9:53   ` [PATCH v5 00/18] Exynos SYSMMU (IOMMU) integration with DT and DMA-mapping subsystem Hongbo Zhang
2015-02-04  9:53     ` Hongbo Zhang
     [not found]     ` <CAOhR-w3xdFtNGi=cfEM=N4ntjrjGwMUzxnqHWoRwy6r-AQOAjA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-02-04 13:54       ` Marek Szyprowski
2015-02-04 13:54         ` Marek Szyprowski
2015-02-04 14:21   ` Joerg Roedel
2015-02-04 14:21     ` Joerg Roedel
2015-04-17 14:33     ` Javier Martinez Canillas
2015-04-17 14:33       ` Javier Martinez Canillas
     [not found]       ` <CABxcv=mXENvPHvvN5iOaUBZKORF49RhDs-tL_PBT4Urh54pd0Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-17 14:48         ` Marek Szyprowski
2015-04-17 14:48           ` Marek Szyprowski
2015-04-17 16:15           ` Javier Martinez Canillas
2015-04-17 16:15             ` Javier Martinez Canillas

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