From: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Cc: Dave P Martin <Dave.Martin-5wv7dgnIgG8@public.gmane.org>,
Thierry Reding
<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Mark Rutland <Mark.Rutland-5wv7dgnIgG8@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Pawel Moll <Pawel.Moll-5wv7dgnIgG8@public.gmane.org>,
Ian Campbell
<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
Grant Grundler <grundler-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>,
Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Marc Zyngier <Marc.Zyngier-5wv7dgnIgG8@public.gmane.org>,
"iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
"linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Cho KyongHo <pullip.cho-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: [PATCH] devicetree: Add generic IOMMU device tree bindings
Date: Tue, 20 May 2014 16:26:59 +0100 [thread overview]
Message-ID: <20140520152659.GA30404@arm.com> (raw)
In-Reply-To: <6382280.3uMvoxaUSK@wuerfel>
On Tue, May 20, 2014 at 02:23:47PM +0100, Arnd Bergmann wrote:
> Bit# 33222222 22221111 11111100 00000000
> 10987654 32109876 54321098 76543210
> phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr
> phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
> phys.lo cell: llllllll llllllll llllllll llllllll
>
> where:
> n is 0 if the address is relocatable, 1 otherwise
> p is 1 if the addressable region is "prefetchable", 0 otherwise
> t is 1 if the address is aliased (for non-relocatable I/O),
> below 1 MB (for Memory), or below 64 KB (for relocatable I/O).
> ss is the space code, denoting the address space
> bbbbbbbb is the 8-bit Bus Number
> ddddd is the 5-bit Device Number
> fff is the 3-bit Function Number
> rrrrrrrr is the 8-bit Register Number
> hh...hh is a 32-bit unsigned number
> ll...ll is a 32-bit unsigned number
>
> We can ignore n, p, t and r here, and use the same format for a DMA
> address, then define an empty "dma-ranges" property. That would
> imply that using b/d/f is sufficient to identify each master at the
> iommu. Any device outside of the PCI host but connected to the same
> iommu can use the same notation to list the logical b/d/f that gets
> sent to the IOMMU in bus master transactions.
>
> Do you think this is sufficient for the ARM SMMU, or do we need
> something beyond that?
I think it can define the common-cases for the existing implementations,
yes. I anticipate Stream-IDs becoming > 16-bit in the near future though,
so we'd need extra bits if we're describing other devices coming into the
SMMU.
Note that we already have a binding for the current SMMU driver, so I'm not
really in a position to shift over to a new binding until the next version of
the SMMU architecture comes along...
Will
WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will.deacon@arm.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Dave P Martin <Dave.Martin@arm.com>,
Thierry Reding <thierry.reding@gmail.com>,
Mark Rutland <Mark.Rutland@arm.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-samsung-soc@vger.kernel.org"
<linux-samsung-soc@vger.kernel.org>,
Pawel Moll <Pawel.Moll@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Grant Grundler <grundler@chromium.org>,
Joerg Roedel <joro@8bytes.org>,
Stephen Warren <swarren@wwwdotorg.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Marc Zyngier <Marc.Zyngier@arm.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
Rob Herring <robh+dt@kernel.org>,
Kumar Gala <galak@codeaurora.org>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
Cho KyongHo <pullip.cho@samsung.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] devicetree: Add generic IOMMU device tree bindings
Date: Tue, 20 May 2014 16:26:59 +0100 [thread overview]
Message-ID: <20140520152659.GA30404@arm.com> (raw)
In-Reply-To: <6382280.3uMvoxaUSK@wuerfel>
On Tue, May 20, 2014 at 02:23:47PM +0100, Arnd Bergmann wrote:
> Bit# 33222222 22221111 11111100 00000000
> 10987654 32109876 54321098 76543210
> phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr
> phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
> phys.lo cell: llllllll llllllll llllllll llllllll
>
> where:
> n is 0 if the address is relocatable, 1 otherwise
> p is 1 if the addressable region is "prefetchable", 0 otherwise
> t is 1 if the address is aliased (for non-relocatable I/O),
> below 1 MB (for Memory), or below 64 KB (for relocatable I/O).
> ss is the space code, denoting the address space
> bbbbbbbb is the 8-bit Bus Number
> ddddd is the 5-bit Device Number
> fff is the 3-bit Function Number
> rrrrrrrr is the 8-bit Register Number
> hh...hh is a 32-bit unsigned number
> ll...ll is a 32-bit unsigned number
>
> We can ignore n, p, t and r here, and use the same format for a DMA
> address, then define an empty "dma-ranges" property. That would
> imply that using b/d/f is sufficient to identify each master at the
> iommu. Any device outside of the PCI host but connected to the same
> iommu can use the same notation to list the logical b/d/f that gets
> sent to the IOMMU in bus master transactions.
>
> Do you think this is sufficient for the ARM SMMU, or do we need
> something beyond that?
I think it can define the common-cases for the existing implementations,
yes. I anticipate Stream-IDs becoming > 16-bit in the near future though,
so we'd need extra bits if we're describing other devices coming into the
SMMU.
Note that we already have a binding for the current SMMU driver, so I'm not
really in a position to shift over to a new binding until the next version of
the SMMU architecture comes along...
Will
WARNING: multiple messages have this Message-ID (diff)
From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] devicetree: Add generic IOMMU device tree bindings
Date: Tue, 20 May 2014 16:26:59 +0100 [thread overview]
Message-ID: <20140520152659.GA30404@arm.com> (raw)
In-Reply-To: <6382280.3uMvoxaUSK@wuerfel>
On Tue, May 20, 2014 at 02:23:47PM +0100, Arnd Bergmann wrote:
> Bit# 33222222 22221111 11111100 00000000
> 10987654 32109876 54321098 76543210
> phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr
> phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
> phys.lo cell: llllllll llllllll llllllll llllllll
>
> where:
> n is 0 if the address is relocatable, 1 otherwise
> p is 1 if the addressable region is "prefetchable", 0 otherwise
> t is 1 if the address is aliased (for non-relocatable I/O),
> below 1 MB (for Memory), or below 64 KB (for relocatable I/O).
> ss is the space code, denoting the address space
> bbbbbbbb is the 8-bit Bus Number
> ddddd is the 5-bit Device Number
> fff is the 3-bit Function Number
> rrrrrrrr is the 8-bit Register Number
> hh...hh is a 32-bit unsigned number
> ll...ll is a 32-bit unsigned number
>
> We can ignore n, p, t and r here, and use the same format for a DMA
> address, then define an empty "dma-ranges" property. That would
> imply that using b/d/f is sufficient to identify each master at the
> iommu. Any device outside of the PCI host but connected to the same
> iommu can use the same notation to list the logical b/d/f that gets
> sent to the IOMMU in bus master transactions.
>
> Do you think this is sufficient for the ARM SMMU, or do we need
> something beyond that?
I think it can define the common-cases for the existing implementations,
yes. I anticipate Stream-IDs becoming > 16-bit in the near future though,
so we'd need extra bits if we're describing other devices coming into the
SMMU.
Note that we already have a binding for the current SMMU driver, so I'm not
really in a position to shift over to a new binding until the next version of
the SMMU architecture comes along...
Will
next prev parent reply other threads:[~2014-05-20 15:26 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-16 12:23 [PATCH] devicetree: Add generic IOMMU device tree bindings Thierry Reding
2014-05-16 12:23 ` Thierry Reding
2014-05-16 12:23 ` Thierry Reding
[not found] ` <1400242998-437-1-git-send-email-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-17 8:04 ` Cho KyongHo
2014-05-17 8:04 ` Cho KyongHo
2014-05-17 8:04 ` Cho KyongHo
2014-05-17 20:48 ` Thierry Reding
2014-05-17 20:48 ` Thierry Reding
2014-05-19 10:26 ` Arnd Bergmann
2014-05-19 10:26 ` Arnd Bergmann
2014-05-19 10:26 ` Arnd Bergmann
2014-05-19 12:53 ` Thierry Reding
2014-05-19 12:53 ` Thierry Reding
2014-05-19 17:22 ` Dave Martin
2014-05-19 17:22 ` Dave Martin
2014-05-19 17:22 ` Dave Martin
[not found] ` <20140519172113.GA13858-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-05-19 20:32 ` Thierry Reding
2014-05-19 20:32 ` Thierry Reding
2014-05-19 20:32 ` Thierry Reding
2014-05-20 10:08 ` Arnd Bergmann
2014-05-20 10:08 ` Arnd Bergmann
2014-05-20 10:08 ` Arnd Bergmann
2014-05-20 13:07 ` Dave Martin
2014-05-20 13:07 ` Dave Martin
2014-05-20 13:07 ` Dave Martin
[not found] ` <20140520130659.GA5041-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-05-20 13:23 ` Arnd Bergmann
2014-05-20 13:23 ` Arnd Bergmann
2014-05-20 13:23 ` Arnd Bergmann
2014-05-20 15:26 ` Will Deacon [this message]
2014-05-20 15:26 ` Will Deacon
2014-05-20 15:26 ` Will Deacon
[not found] ` <20140520152659.GA30404-5wv7dgnIgG8@public.gmane.org>
2014-05-20 16:39 ` Dave Martin
2014-05-20 16:39 ` Dave Martin
2014-05-20 16:39 ` Dave Martin
[not found] ` <20140520163912.GC5041-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-05-20 20:40 ` Arnd Bergmann
2014-05-20 20:40 ` Arnd Bergmann
2014-05-20 20:40 ` Arnd Bergmann
2014-05-19 18:34 ` Arnd Bergmann
2014-05-19 18:34 ` Arnd Bergmann
2014-05-19 20:59 ` Thierry Reding
2014-05-19 20:59 ` Thierry Reding
2014-05-19 20:59 ` Thierry Reding
2014-05-20 10:04 ` Arnd Bergmann
2014-05-20 10:04 ` Arnd Bergmann
2014-05-20 11:05 ` Thierry Reding
2014-05-20 11:05 ` Thierry Reding
2014-05-20 11:05 ` Thierry Reding
2014-05-20 11:15 ` Arnd Bergmann
2014-05-20 11:15 ` Arnd Bergmann
2014-05-20 12:02 ` Thierry Reding
2014-05-20 12:02 ` Thierry Reding
2014-05-20 12:02 ` Thierry Reding
2014-05-20 12:41 ` Arnd Bergmann
2014-05-20 12:41 ` Arnd Bergmann
2014-05-20 12:41 ` Arnd Bergmann
2014-05-20 13:17 ` Thierry Reding
2014-05-20 13:17 ` Thierry Reding
2014-05-20 13:17 ` Thierry Reding
2014-05-20 13:34 ` Arnd Bergmann
2014-05-20 13:34 ` Arnd Bergmann
2014-05-20 13:34 ` Arnd Bergmann
2014-05-20 14:00 ` Thierry Reding
2014-05-20 14:00 ` Thierry Reding
2014-05-20 14:00 ` Thierry Reding
2014-05-20 20:31 ` Arnd Bergmann
2014-05-20 20:31 ` Arnd Bergmann
2014-05-21 8:16 ` Thierry Reding
2014-05-21 8:16 ` Thierry Reding
2014-05-21 8:16 ` Thierry Reding
2014-05-21 8:54 ` Arnd Bergmann
2014-05-21 8:54 ` Arnd Bergmann
2014-05-21 8:54 ` Arnd Bergmann
2014-05-21 9:02 ` Thierry Reding
2014-05-21 9:02 ` Thierry Reding
2014-05-21 9:02 ` Thierry Reding
2014-05-21 9:32 ` Arnd Bergmann
2014-05-21 9:32 ` Arnd Bergmann
2014-05-21 15:44 ` Grant Grundler
2014-05-21 15:44 ` Grant Grundler
2014-05-21 15:44 ` Grant Grundler
2014-05-21 16:01 ` Arnd Bergmann
2014-05-21 16:01 ` Arnd Bergmann
2014-05-21 16:01 ` Arnd Bergmann
2014-05-20 15:24 ` Dave Martin
2014-05-20 15:24 ` Dave Martin
2014-05-20 15:24 ` Dave Martin
[not found] ` <20140520152458.GB5041-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-05-20 20:26 ` Arnd Bergmann
2014-05-20 20:26 ` Arnd Bergmann
2014-05-20 20:26 ` Arnd Bergmann
2014-05-21 8:26 ` Thierry Reding
2014-05-21 8:26 ` Thierry Reding
2014-05-21 8:26 ` Thierry Reding
2014-05-21 8:50 ` Arnd Bergmann
2014-05-21 8:50 ` Arnd Bergmann
2014-05-21 8:50 ` Arnd Bergmann
2014-05-21 9:00 ` Thierry Reding
2014-05-21 9:00 ` Thierry Reding
2014-05-21 9:00 ` Thierry Reding
2014-05-21 9:36 ` Arnd Bergmann
2014-05-21 9:36 ` Arnd Bergmann
2014-05-21 9:36 ` Arnd Bergmann
2014-05-21 10:50 ` Thierry Reding
2014-05-21 10:50 ` Thierry Reding
2014-05-21 10:50 ` Thierry Reding
2014-05-21 14:01 ` Arnd Bergmann
2014-05-21 14:01 ` Arnd Bergmann
2014-05-21 14:01 ` Arnd Bergmann
2014-05-21 17:09 ` Dave Martin
2014-05-21 17:09 ` Dave Martin
2014-05-21 17:09 ` Dave Martin
[not found] ` <20140521170954.GC3830-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-05-21 18:11 ` Arnd Bergmann
2014-05-21 18:11 ` Arnd Bergmann
2014-05-21 18:11 ` Arnd Bergmann
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