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From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Cc: Olav Haugan <ohaugan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	Mark Rutland <Mark.Rutland-5wv7dgnIgG8@public.gmane.org>,
	"linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Pawel Moll <Pawel.Moll-5wv7dgnIgG8@public.gmane.org>,
	"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Grant Grundler <grundler-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
	Ian Campbell
	<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Marc Zyngier <Marc.Zyngier-5wv7dgnIgG8@public.gmane.org>,
	Linux IOMMU
	<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Thierry Reding
	<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Cho KyongHo <pullip.cho-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
	Dave P Martin <Dave.Martin-5wv7dgnIgG8@public.gmane.org>,
	"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: [PATCH v2] devicetree: Add generic IOMMU device tree bindings
Date: Wed, 25 Jun 2014 12:12:13 +0200	[thread overview]
Message-ID: <6589024.32Qh7fFhXo@wuerfel> (raw)
In-Reply-To: <20140625095735.GI6153-5wv7dgnIgG8@public.gmane.org>

On Wednesday 25 June 2014 10:57:36 Will Deacon wrote:
> So far, I've been avoiding the hardcoding. However, you could potentially
> build a system with a small number of SMRs (compared to the number of
> StreamIDs) and allocate the StreamIDs in such a way that I think the dynamic
> configuration would be NP complete if we require an optimal SMR allocation.
> 
> However:
> 
>   (1) I don't know of a system where this is the case
>   (2) Not much work has been done on improving the dynamic allocator yet
> 
> which is why I'm still favouring dynamic configuration in the driver.
> 
> The other thing I forgot to mention earlier is that we need to support
> device hotplug in the future, so some level of dynamic configuration
> will always be required.

Ok, got it. So we just hope that we can make dynamic configuration
work all the time, but if it all fails, then we come up with a
hardcoded configuration method.

I guess this could be done similarly to how we handle clocks on
a lot of systems: generally these are dynamic, but you have the
option to provide hints in the clock controller node about how
you expect things to be configured.

For the SMMU that could mean that (if we get into the situation you
describe), we add optional properties to the SMMU node itself
describing how we expect the SMRs to be used.

	Arnd

WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Will Deacon <will.deacon@arm.com>
Cc: Olav Haugan <ohaugan@codeaurora.org>,
	Rob Herring <robherring2@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>,
	Linux IOMMU <iommu@lists.linux-foundation.org>,
	Rob Herring <robh+dt@kernel.org>,
	Thierry Reding <thierry.reding@gmail.com>,
	Kumar Gala <galak@codeaurora.org>,
	"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
	Cho KyongHo <pullip.cho@samsung.com>,
	Dave P Martin <Dave.Martin@arm.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	Hiroshi Doyu <hdoyu@nvidia.com>
Subject: Re: [PATCH v2] devicetree: Add generic IOMMU device tree bindings
Date: Wed, 25 Jun 2014 12:12:13 +0200	[thread overview]
Message-ID: <6589024.32Qh7fFhXo@wuerfel> (raw)
In-Reply-To: <20140625095735.GI6153@arm.com>

On Wednesday 25 June 2014 10:57:36 Will Deacon wrote:
> So far, I've been avoiding the hardcoding. However, you could potentially
> build a system with a small number of SMRs (compared to the number of
> StreamIDs) and allocate the StreamIDs in such a way that I think the dynamic
> configuration would be NP complete if we require an optimal SMR allocation.
> 
> However:
> 
>   (1) I don't know of a system where this is the case
>   (2) Not much work has been done on improving the dynamic allocator yet
> 
> which is why I'm still favouring dynamic configuration in the driver.
> 
> The other thing I forgot to mention earlier is that we need to support
> device hotplug in the future, so some level of dynamic configuration
> will always be required.

Ok, got it. So we just hope that we can make dynamic configuration
work all the time, but if it all fails, then we come up with a
hardcoded configuration method.

I guess this could be done similarly to how we handle clocks on
a lot of systems: generally these are dynamic, but you have the
option to provide hints in the clock controller node about how
you expect things to be configured.

For the SMMU that could mean that (if we get into the situation you
describe), we add optional properties to the SMMU node itself
describing how we expect the SMRs to be used.

	Arnd

WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] devicetree: Add generic IOMMU device tree bindings
Date: Wed, 25 Jun 2014 12:12:13 +0200	[thread overview]
Message-ID: <6589024.32Qh7fFhXo@wuerfel> (raw)
In-Reply-To: <20140625095735.GI6153@arm.com>

On Wednesday 25 June 2014 10:57:36 Will Deacon wrote:
> So far, I've been avoiding the hardcoding. However, you could potentially
> build a system with a small number of SMRs (compared to the number of
> StreamIDs) and allocate the StreamIDs in such a way that I think the dynamic
> configuration would be NP complete if we require an optimal SMR allocation.
> 
> However:
> 
>   (1) I don't know of a system where this is the case
>   (2) Not much work has been done on improving the dynamic allocator yet
> 
> which is why I'm still favouring dynamic configuration in the driver.
> 
> The other thing I forgot to mention earlier is that we need to support
> device hotplug in the future, so some level of dynamic configuration
> will always be required.

Ok, got it. So we just hope that we can make dynamic configuration
work all the time, but if it all fails, then we come up with a
hardcoded configuration method.

I guess this could be done similarly to how we handle clocks on
a lot of systems: generally these are dynamic, but you have the
option to provide hints in the clock controller node about how
you expect things to be configured.

For the SMMU that could mean that (if we get into the situation you
describe), we add optional properties to the SMMU node itself
describing how we expect the SMRs to be used.

	Arnd

  parent reply	other threads:[~2014-06-25 10:12 UTC|newest]

Thread overview: 215+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-23 20:33 [PATCH v2] devicetree: Add generic IOMMU device tree bindings Thierry Reding
     [not found] ` <1400877218-4113-1-git-send-email-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-30 13:16   ` Rob Herring
2014-05-30 13:16     ` Rob Herring
2014-05-30 13:16     ` Rob Herring
     [not found]     ` <CAL_JsqKumG1PSFoVfeGpLLG+MjXFeF4aUjun=vv1BJpaxk0Byg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-30 19:06       ` Arnd Bergmann
2014-05-30 19:06         ` Arnd Bergmann
2014-05-30 19:06         ` Arnd Bergmann
2014-05-30 19:29         ` Hiroshi Doyu
2014-05-30 19:29           ` Hiroshi Doyu
2014-05-30 19:29           ` Hiroshi Doyu
2014-05-30 19:54           ` Arnd Bergmann
2014-05-30 19:54             ` Arnd Bergmann
2014-05-30 19:54             ` Arnd Bergmann
2014-06-01  9:55             ` Will Deacon
2014-06-01  9:55               ` Will Deacon
2014-06-01  9:55               ` Will Deacon
     [not found]               ` <20140601095546.GA8625-5wv7dgnIgG8@public.gmane.org>
2014-06-04 13:39                 ` Thierry Reding
2014-06-04 13:39                   ` Thierry Reding
2014-06-04 13:39                   ` Thierry Reding
2014-06-04 13:44             ` Thierry Reding
2014-06-04 13:44               ` Thierry Reding
2014-06-04 13:44               ` Thierry Reding
2014-06-04 13:53               ` Arnd Bergmann
2014-06-04 13:53                 ` Arnd Bergmann
2014-06-04 13:53                 ` Arnd Bergmann
2014-06-04 13:56               ` Will Deacon
2014-06-04 13:56                 ` Will Deacon
2014-06-04 13:56                 ` Will Deacon
     [not found]                 ` <20140604135600.GD6644-5wv7dgnIgG8@public.gmane.org>
2014-06-04 14:01                   ` Arnd Bergmann
2014-06-04 14:01                     ` Arnd Bergmann
2014-06-04 14:01                     ` Arnd Bergmann
2014-06-04 16:39                     ` Will Deacon
2014-06-04 16:39                       ` Will Deacon
2014-06-04 16:39                       ` Will Deacon
2014-05-30 19:31         ` Rob Herring
2014-05-30 19:31           ` Rob Herring
2014-05-30 19:31           ` Rob Herring
     [not found]           ` <CAL_Jsq+tkFNpjSEZboT+o69B_Z3a8e-ZVKaYDmLwtkyYoPy6VQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-30 19:49             ` Arnd Bergmann
2014-05-30 19:49               ` Arnd Bergmann
2014-05-30 19:49               ` Arnd Bergmann
2014-06-02 10:41               ` Dave Martin
2014-06-02 10:41                 ` Dave Martin
2014-06-02 10:41                 ` Dave Martin
     [not found]                 ` <20140602104104.GD3855-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-06-04 14:35                   ` Thierry Reding
2014-06-04 14:35                     ` Thierry Reding
2014-06-04 14:35                     ` Thierry Reding
2014-06-04 16:41                     ` Will Deacon
2014-06-04 16:41                       ` Will Deacon
2014-06-04 16:41                       ` Will Deacon
     [not found]                       ` <20140604164132.GF6644-5wv7dgnIgG8@public.gmane.org>
2014-06-04 21:00                         ` Thierry Reding
2014-06-04 21:00                           ` Thierry Reding
2014-06-04 21:00                           ` Thierry Reding
2014-06-05 19:10                       ` Varun Sethi
2014-06-05 19:10                         ` Varun Sethi
2014-06-05 19:10                         ` Varun Sethi
2014-06-16 15:27                         ` Will Deacon
2014-06-16 15:27                           ` Will Deacon
2014-06-16 15:27                           ` Will Deacon
     [not found]                           ` <20140616152739.GS16758-5wv7dgnIgG8@public.gmane.org>
2014-06-16 16:56                             ` Stuart Yoder
2014-06-16 16:56                               ` Stuart Yoder
2014-06-16 16:56                               ` Stuart Yoder
     [not found]                               ` <8b0492b4697943a0b1f276ef42cc8223-ufbTtyGzTTT8GZusEWM6WuO6mTEJWrR4XA4E9RH9d+qIuWR1G4zioA@public.gmane.org>
2014-06-16 17:04                                 ` Will Deacon
2014-06-16 17:04                                   ` Will Deacon
2014-06-16 17:04                                   ` Will Deacon
     [not found]                                   ` <20140616170416.GA16758-5wv7dgnIgG8@public.gmane.org>
2014-06-16 17:30                                     ` Arnd Bergmann
2014-06-16 17:30                                       ` Arnd Bergmann
2014-06-16 17:30                                       ` Arnd Bergmann
2014-06-16 18:53                                     ` Stuart Yoder
2014-06-16 18:53                                       ` Stuart Yoder
2014-06-16 18:53                                       ` Stuart Yoder
     [not found]                                       ` <419e67f783524d208ab3be16bcd94bd9-ufbTtyGzTTT8GZusEWM6WuO6mTEJWrR4XA4E9RH9d+qIuWR1G4zioA@public.gmane.org>
2014-06-17 10:26                                         ` Varun Sethi
2014-06-17 10:26                                           ` Varun Sethi
2014-06-17 10:26                                           ` Varun Sethi
     [not found]                                           ` <0587e1f4894546398be0798d2bc2c84f-AZ66ij2kwaacCcN9WK45f+O6mTEJWrR4XA4E9RH9d+qIuWR1G4zioA@public.gmane.org>
2014-06-17 10:43                                             ` Will Deacon
2014-06-17 10:43                                               ` Will Deacon
2014-06-17 10:43                                               ` Will Deacon
     [not found]                                               ` <20140617104304.GD13808-5wv7dgnIgG8@public.gmane.org>
2014-06-17 11:21                                                 ` Varun Sethi
2014-06-17 11:21                                                   ` Varun Sethi
2014-06-17 11:21                                                   ` Varun Sethi
     [not found]                                                   ` <32165315f0b84be9948f489fd87bf6a9-AZ66ij2kwaacCcN9WK45f+O6mTEJWrR4XA4E9RH9d+qIuWR1G4zioA@public.gmane.org>
2014-06-17 14:50                                                     ` Stuart Yoder
2014-06-17 14:50                                                       ` Stuart Yoder
2014-06-17 14:50                                                       ` Stuart Yoder
2014-06-18  9:29                                                       ` Will Deacon
2014-06-18  9:29                                                         ` Will Deacon
2014-06-18  9:29                                                         ` Will Deacon
2014-06-17 14:39                                           ` Stuart Yoder
2014-06-17 14:39                                             ` Stuart Yoder
2014-06-17 14:39                                             ` Stuart Yoder
2014-06-20 23:16         ` Olav Haugan
2014-06-20 23:16           ` Olav Haugan
2014-06-20 23:16           ` Olav Haugan
2014-06-24  9:18           ` Will Deacon
2014-06-24  9:18             ` Will Deacon
2014-06-24  9:18             ` Will Deacon
     [not found]             ` <20140624091808.GC26013-5wv7dgnIgG8@public.gmane.org>
2014-06-24 17:57               ` Olav Haugan
2014-06-24 17:57                 ` Olav Haugan
2014-06-24 17:57                 ` Olav Haugan
2014-06-24 18:11                 ` Will Deacon
2014-06-24 18:11                   ` Will Deacon
2014-06-24 18:11                   ` Will Deacon
     [not found]                   ` <20140624181150.GB4067-5wv7dgnIgG8@public.gmane.org>
2014-06-24 18:20                     ` Arnd Bergmann
2014-06-24 18:20                       ` Arnd Bergmann
2014-06-24 18:20                       ` Arnd Bergmann
2014-06-25  9:17                       ` Will Deacon
2014-06-25  9:17                         ` Will Deacon
2014-06-25  9:17                         ` Will Deacon
2014-06-25  9:27                         ` Arnd Bergmann
2014-06-25  9:27                           ` Arnd Bergmann
2014-06-25  9:27                           ` Arnd Bergmann
2014-06-25  9:38                           ` Will Deacon
2014-06-25  9:38                             ` Will Deacon
2014-06-25  9:38                             ` Will Deacon
2014-06-25  9:48                             ` Arnd Bergmann
2014-06-25  9:48                               ` Arnd Bergmann
2014-06-25  9:48                               ` Arnd Bergmann
2014-06-25  9:57                               ` Will Deacon
2014-06-25  9:57                                 ` Will Deacon
2014-06-25  9:57                                 ` Will Deacon
     [not found]                                 ` <20140625095735.GI6153-5wv7dgnIgG8@public.gmane.org>
2014-06-25 10:12                                   ` Arnd Bergmann [this message]
2014-06-25 10:12                                     ` Arnd Bergmann
2014-06-25 10:12                                     ` Arnd Bergmann
2014-06-25 10:14                                     ` Will Deacon
2014-06-25 10:14                                       ` Will Deacon
2014-06-25 10:14                                       ` Will Deacon
2014-06-24 21:35                     ` Olav Haugan
2014-06-24 21:35                       ` Olav Haugan
2014-06-24 21:35                       ` Olav Haugan
     [not found]                       ` <53A9EF3A.2070704-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-06-25  9:18                         ` Will Deacon
2014-06-25  9:18                           ` Will Deacon
2014-06-25  9:18                           ` Will Deacon
     [not found]                           ` <20140625091858.GG6153-5wv7dgnIgG8@public.gmane.org>
2014-06-27 22:23                             ` Olav Haugan
2014-06-27 22:23                               ` Olav Haugan
2014-06-27 22:23                               ` Olav Haugan
     [not found]                               ` <53ADEEDF.7060902-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-06-30  9:52                                 ` Will Deacon
2014-06-30  9:52                                   ` Will Deacon
2014-06-30  9:52                                   ` Will Deacon
2014-07-09  1:07                                   ` Olav Haugan
2014-07-09  1:07                                     ` Olav Haugan
2014-07-09  1:07                                     ` Olav Haugan
     [not found]                                     ` <53BC95DA.1010500-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-07-09 10:54                                       ` Will Deacon
2014-07-09 10:54                                         ` Will Deacon
2014-07-09 10:54                                         ` Will Deacon
     [not found]                                         ` <20140709105441.GE9485-5wv7dgnIgG8@public.gmane.org>
2014-07-10 22:32                                           ` Olav Haugan
2014-07-10 22:32                                             ` Olav Haugan
2014-07-10 22:32                                             ` Olav Haugan
2014-07-11 12:24                                             ` Will Deacon
2014-07-11 12:24                                               ` Will Deacon
2014-07-11 12:24                                               ` Will Deacon
2014-05-23 20:36 Thierry Reding
2014-05-23 20:36 ` Thierry Reding
2014-05-23 20:36 ` Thierry Reding
     [not found] ` <1400877395-4235-1-git-send-email-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-29 15:52   ` Stephen Warren
2014-05-29 15:52     ` Stephen Warren
2014-05-29 15:52     ` Stephen Warren
2014-05-30  7:30     ` Thierry Reding
2014-05-30  7:30       ` Thierry Reding
2014-05-30 11:27       ` Dave Martin
2014-05-30 11:27         ` Dave Martin
2014-05-30 11:27         ` Dave Martin
     [not found]         ` <20140530112728.GB3949-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-05-30 19:11           ` Arnd Bergmann
2014-05-30 19:11             ` Arnd Bergmann
2014-05-30 19:11             ` Arnd Bergmann
2014-06-02 10:56             ` Dave Martin
2014-06-02 10:56               ` Dave Martin
2014-06-02 10:56               ` Dave Martin
2014-06-04 21:12         ` Thierry Reding
2014-06-04 21:12           ` Thierry Reding
2014-06-04 21:12           ` Thierry Reding
2014-06-16 12:57           ` Will Deacon
2014-06-16 12:57             ` Will Deacon
2014-06-16 12:57             ` Will Deacon
2014-06-17 11:58             ` Thierry Reding
2014-06-17 11:58               ` Thierry Reding
2014-06-17 11:58               ` Thierry Reding
2014-06-17 12:18               ` Will Deacon
2014-06-17 12:18                 ` Will Deacon
2014-06-17 12:18                 ` Will Deacon
2014-06-17 23:37                 ` Thierry Reding
2014-06-17 23:37                   ` Thierry Reding
2014-06-17 23:37                   ` Thierry Reding
2014-06-18 10:14                   ` Will Deacon
2014-06-18 10:14                     ` Will Deacon
2014-06-18 10:14                     ` Will Deacon
     [not found]                     ` <20140618101439.GF32699-5wv7dgnIgG8@public.gmane.org>
2014-06-20 15:53                       ` Arnd Bergmann
2014-06-20 15:53                         ` Arnd Bergmann
2014-06-20 15:53                         ` Arnd Bergmann
2014-06-20 17:50                         ` Will Deacon
2014-06-20 17:50                           ` Will Deacon
2014-06-20 17:50                           ` Will Deacon
2014-06-20 18:55                           ` Arnd Bergmann
2014-06-20 18:55                             ` Arnd Bergmann
2014-06-20 18:55                             ` Arnd Bergmann
2014-05-30 11:22   ` Dave Martin
2014-05-30 11:22     ` Dave Martin
2014-05-30 11:22     ` Dave Martin
     [not found]     ` <20140530112226.GA3949-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-05-30 19:01       ` Arnd Bergmann
2014-05-30 19:01         ` Arnd Bergmann
2014-05-30 19:01         ` Arnd Bergmann
2014-06-02 11:44         ` Dave Martin
2014-06-02 11:44           ` Dave Martin
2014-06-02 11:44           ` Dave Martin
2014-06-04 21:32         ` Thierry Reding
2014-06-04 21:32           ` Thierry Reding
2014-06-04 21:32           ` Thierry Reding
2014-06-05  9:42           ` Arnd Bergmann
2014-06-05  9:42             ` Arnd Bergmann
2014-06-05  9:42             ` Arnd Bergmann
2014-06-06 22:45 Thierry Reding
2014-06-06 22:45 ` Thierry Reding
2014-06-07 13:22 ` Arnd Bergmann
2014-06-07 13:22   ` Arnd Bergmann
2014-06-07 13:22   ` Arnd Bergmann
2014-06-09 10:49   ` Thierry Reding
2014-06-09 10:49     ` Thierry Reding
2014-06-09 10:49     ` Thierry Reding

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