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From: "Sven Peter" <sven@svenpeter.dev>
To: "Mark Kettenis" <mark.kettenis@xs4all.nl>,
	"Arnd Bergmann" <arnd@kernel.org>
Cc: "Rob Herring" <robh@kernel.org>,
	iommu@lists.linux-foundation.org, joro@8bytes.org,
	"Will Deacon" <will@kernel.org>,
	"Robin Murphy" <robin.murphy@arm.com>,
	"Hector Martin" <marcan@marcan.st>,
	"Marc Zyngier" <maz@kernel.org>,
	mohamed.mediouni@caramail.com, stan@corellium.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH 0/3] Apple M1 DART IOMMU driver
Date: Fri, 26 Mar 2021 17:10:29 +0100	[thread overview]
Message-ID: <9f06872d-f0ec-43c3-9b53-d144337100b3@www.fastmail.com> (raw)
In-Reply-To: <c1bcd90d344c2b68@bloch.sibelius.xs4all.nl>



On Fri, Mar 26, 2021, at 16:59, Mark Kettenis wrote:
> Some of the DARTs provide a bypass facility.  That code make using the
> standard "dma-ranges" property tricky.  That property would need to
> contain the bypass address range.  But that would mean that if the
> DART driver needs to look at that property to figure out the address
> range that supports translation it will need to be able to distinguish
> between the translatable address range and the bypass address range.

Do we understand if and why we even need to bypass certain streams?
And do you have an example for a node in the ADT that contains this bypass range?

I've only seen nodes with "bypass" and "bypass-adress" but that could just be
some software abstraction Apple uses which doesn't map well to Linux or other OSes
and might not even be required here.


Sven


WARNING: multiple messages have this Message-ID (diff)
From: Sven Peter via iommu <iommu@lists.linux-foundation.org>
To: "Mark Kettenis" <mark.kettenis@xs4all.nl>,
	"Arnd Bergmann" <arnd@kernel.org>
Cc: Rob Herring <robh@kernel.org>,
	devicetree@vger.kernel.org, Robin Murphy <robin.murphy@arm.com>,
	Hector Martin <marcan@marcan.st>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	Marc Zyngier <maz@kernel.org>,
	mohamed.mediouni@caramail.com, Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org, stan@corellium.com
Subject: Re: [PATCH 0/3] Apple M1 DART IOMMU driver
Date: Fri, 26 Mar 2021 17:10:29 +0100	[thread overview]
Message-ID: <9f06872d-f0ec-43c3-9b53-d144337100b3@www.fastmail.com> (raw)
In-Reply-To: <c1bcd90d344c2b68@bloch.sibelius.xs4all.nl>



On Fri, Mar 26, 2021, at 16:59, Mark Kettenis wrote:
> Some of the DARTs provide a bypass facility.  That code make using the
> standard "dma-ranges" property tricky.  That property would need to
> contain the bypass address range.  But that would mean that if the
> DART driver needs to look at that property to figure out the address
> range that supports translation it will need to be able to distinguish
> between the translatable address range and the bypass address range.

Do we understand if and why we even need to bypass certain streams?
And do you have an example for a node in the ADT that contains this bypass range?

I've only seen nodes with "bypass" and "bypass-adress" but that could just be
some software abstraction Apple uses which doesn't map well to Linux or other OSes
and might not even be required here.


Sven

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

WARNING: multiple messages have this Message-ID (diff)
From: "Sven Peter" <sven@svenpeter.dev>
To: "Mark Kettenis" <mark.kettenis@xs4all.nl>,
	"Arnd Bergmann" <arnd@kernel.org>
Cc: "Rob Herring" <robh@kernel.org>,
	iommu@lists.linux-foundation.org, joro@8bytes.org,
	"Will Deacon" <will@kernel.org>,
	"Robin Murphy" <robin.murphy@arm.com>,
	"Hector Martin" <marcan@marcan.st>,
	"Marc Zyngier" <maz@kernel.org>,
	mohamed.mediouni@caramail.com, stan@corellium.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH 0/3] Apple M1 DART IOMMU driver
Date: Fri, 26 Mar 2021 17:10:29 +0100	[thread overview]
Message-ID: <9f06872d-f0ec-43c3-9b53-d144337100b3@www.fastmail.com> (raw)
In-Reply-To: <c1bcd90d344c2b68@bloch.sibelius.xs4all.nl>



On Fri, Mar 26, 2021, at 16:59, Mark Kettenis wrote:
> Some of the DARTs provide a bypass facility.  That code make using the
> standard "dma-ranges" property tricky.  That property would need to
> contain the bypass address range.  But that would mean that if the
> DART driver needs to look at that property to figure out the address
> range that supports translation it will need to be able to distinguish
> between the translatable address range and the bypass address range.

Do we understand if and why we even need to bypass certain streams?
And do you have an example for a node in the ADT that contains this bypass range?

I've only seen nodes with "bypass" and "bypass-adress" but that could just be
some software abstraction Apple uses which doesn't map well to Linux or other OSes
and might not even be required here.


Sven


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2021-03-26 16:11 UTC|newest]

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-20 15:19 [PATCH 0/3] Apple M1 DART IOMMU driver Sven Peter
2021-03-20 15:19 ` Sven Peter
2021-03-20 15:19 ` Sven Peter via iommu
2021-03-20 15:19 ` [PATCH 1/3] iommu: io-pgtable: add DART pagetable format Sven Peter
2021-03-20 15:19   ` Sven Peter
2021-03-20 15:19   ` Sven Peter via iommu
2021-03-24 16:37   ` Robin Murphy
2021-03-24 16:37     ` Robin Murphy
2021-03-24 16:37     ` Robin Murphy
2021-03-25 20:47     ` Sven Peter
2021-03-25 20:47       ` Sven Peter
2021-03-25 20:47       ` Sven Peter via iommu
2021-03-20 15:20 ` [PATCH 2/3] dt-bindings: iommu: add DART iommu bindings Sven Peter
2021-03-20 15:20   ` Sven Peter
2021-03-20 15:20   ` Sven Peter via iommu
2021-03-22  0:15   ` Rob Herring
2021-03-22  0:15     ` Rob Herring
2021-03-22  0:15     ` Rob Herring
2021-03-22 18:16     ` Sven Peter
2021-03-22 18:16       ` Sven Peter
2021-03-22 18:16       ` Sven Peter via iommu
2021-03-21 16:00 ` [PATCH 0/3] Apple M1 DART IOMMU driver Mark Kettenis
2021-03-21 16:00   ` Mark Kettenis
2021-03-21 16:00   ` Mark Kettenis
2021-03-21 17:22   ` Sven Peter via iommu
2021-03-21 18:35     ` Mark Kettenis
2021-03-21 18:35       ` Mark Kettenis
2021-03-21 18:35       ` Mark Kettenis
2021-03-22 22:17       ` Sven Peter
2021-03-22 22:17         ` Sven Peter
2021-03-22 22:17         ` Sven Peter via iommu
2021-03-23 20:00         ` Mark Kettenis
2021-03-23 20:00           ` Mark Kettenis
2021-03-23 20:00           ` Mark Kettenis
2021-03-23 21:03           ` Sven Peter
2021-03-23 21:03             ` Sven Peter
2021-03-23 21:03             ` Sven Peter via iommu
2021-03-21 17:28   ` Sven Peter
2021-03-21 17:28     ` Sven Peter
2021-03-21 17:28     ` Sven Peter via iommu
2021-03-23 20:53   ` Rob Herring
2021-03-23 20:53     ` Rob Herring
2021-03-23 20:53     ` Rob Herring
2021-03-23 22:33     ` Mark Kettenis
2021-03-23 22:33       ` Mark Kettenis
2021-03-23 22:33       ` Mark Kettenis
2021-03-25  7:53     ` Sven Peter
2021-03-25  7:53       ` Sven Peter
2021-03-25  7:53       ` Sven Peter via iommu
2021-03-25 11:50       ` Robin Murphy
2021-03-25 11:50         ` Robin Murphy
2021-03-25 11:50         ` Robin Murphy
2021-03-25 20:49         ` Sven Peter
2021-03-25 20:49           ` Sven Peter
2021-03-25 20:49           ` Sven Peter via iommu
2021-03-27 15:33         ` Sven Peter
2021-03-27 15:33           ` Sven Peter
2021-03-27 15:33           ` Sven Peter via iommu
2021-03-25 21:41       ` Arnd Bergmann
2021-03-25 21:41         ` Arnd Bergmann
2021-03-25 21:41         ` Arnd Bergmann
2021-03-26 15:59         ` Mark Kettenis
2021-03-26 15:59           ` Mark Kettenis
2021-03-26 15:59           ` Mark Kettenis
2021-03-26 16:09           ` Arnd Bergmann
2021-03-26 16:09             ` Arnd Bergmann
2021-03-26 16:09             ` Arnd Bergmann
2021-03-26 16:10           ` Sven Peter [this message]
2021-03-26 16:10             ` Sven Peter
2021-03-26 16:10             ` Sven Peter via iommu
2021-03-26 16:38             ` Arnd Bergmann
2021-03-26 16:38               ` Arnd Bergmann
2021-03-26 16:38               ` Arnd Bergmann
2021-03-26 17:06               ` Sven Peter
2021-03-26 17:06                 ` Sven Peter
2021-03-26 17:06                 ` Sven Peter via iommu
2021-03-26 17:26               ` Mark Kettenis
2021-03-26 17:26                 ` Mark Kettenis
2021-03-26 17:26                 ` Mark Kettenis
2021-03-26 17:34                 ` Robin Murphy
2021-03-26 17:34                   ` Robin Murphy
2021-03-26 17:34                   ` Robin Murphy
2021-03-26 17:51                   ` Sven Peter
2021-03-26 17:51                     ` Sven Peter
2021-03-26 17:51                     ` Sven Peter via iommu
2021-03-26 19:59                     ` Arnd Bergmann
2021-03-26 19:59                       ` Arnd Bergmann
2021-03-26 19:59                       ` Arnd Bergmann
2021-03-26 21:16                       ` Mark Kettenis
2021-03-26 21:16                         ` Mark Kettenis
2021-03-26 21:16                         ` Mark Kettenis
2021-03-27 15:30                       ` Sven Peter
2021-03-27 15:30                         ` Sven Peter
2021-03-27 15:30                         ` Sven Peter via iommu
2021-03-26 20:03                 ` Arnd Bergmann
2021-03-26 20:03                   ` Arnd Bergmann
2021-03-26 20:03                   ` Arnd Bergmann
2021-03-26 21:13                   ` Mark Kettenis
2021-03-26 21:13                     ` Mark Kettenis
2021-03-26 21:13                     ` Mark Kettenis
2021-03-24 15:29 ` Robin Murphy
2021-03-24 15:29   ` Robin Murphy
2021-03-24 15:29   ` Robin Murphy
2021-03-25  7:58   ` Sven Peter
2021-03-25  7:58     ` Sven Peter
2021-03-25  7:58     ` Sven Peter via iommu

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