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From: Joerg Roedel <joro@8bytes.org>
To: Sinan Kaya <okaya@codeaurora.org>
Cc: Gil Kupfer <gilkup@gmail.com>,
	dwmw2@infradead.org, bhelgaas@google.com,
	iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org, nadav.amit@gmail.com,
	Gil Kupfer <gilkup@cs.technion.ac.il>,
	Will Deacon <will.deacon@arm.com>
Subject: Re: [RFC/RFT] Add noats flag to boot parameters
Date: Thu, 3 May 2018 15:59:21 +0200	[thread overview]
Message-ID: <20180503135920.o2rdh3exai7qmkvu@8bytes.org> (raw)
In-Reply-To: <359d736a-a7ac-f0e4-f4db-dc7bb506481c@codeaurora.org>

On Thu, May 03, 2018 at 09:46:34AM -0400, Sinan Kaya wrote:
> I also like the idea in general.
> Minor nit..
> 
> Shouldn't this be an iommu parameter rather than a PCI kernel command line parameter?
> We now have an iommu.passthrough argument that prevents page translation.
> 
> Doesn't this fit into the same category especially when it is the IOMMU drivers that
> call ATS functions for enablement not the PCI drivers.

ATS is a bit of a grey area between PCI and IOMMU, but since ATS is
PCI-specific and the code to enable/disable it is in PCI as well, I
think the parameter makes sense for PCI too.


	Joerg

WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Sinan Kaya <okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Cc: Gil Kupfer <gilkup-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
	bhelgaas-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
	dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org
Subject: Re: [RFC/RFT] Add noats flag to boot parameters
Date: Thu, 3 May 2018 15:59:21 +0200	[thread overview]
Message-ID: <20180503135920.o2rdh3exai7qmkvu@8bytes.org> (raw)
In-Reply-To: <359d736a-a7ac-f0e4-f4db-dc7bb506481c-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

On Thu, May 03, 2018 at 09:46:34AM -0400, Sinan Kaya wrote:
> I also like the idea in general.
> Minor nit..
> 
> Shouldn't this be an iommu parameter rather than a PCI kernel command line parameter?
> We now have an iommu.passthrough argument that prevents page translation.
> 
> Doesn't this fit into the same category especially when it is the IOMMU drivers that
> call ATS functions for enablement not the PCI drivers.

ATS is a bit of a grey area between PCI and IOMMU, but since ATS is
PCI-specific and the code to enable/disable it is in PCI as well, I
think the parameter makes sense for PCI too.


	Joerg

  reply	other threads:[~2018-05-03 13:59 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-29 18:16 [RFC/RFT] Add noats flag to boot parameters Gil Kupfer
2018-05-03 13:35 ` Joerg Roedel
2018-05-03 13:46   ` Sinan Kaya
2018-05-03 13:46     ` Sinan Kaya
2018-05-03 13:59     ` Joerg Roedel [this message]
2018-05-03 13:59       ` Joerg Roedel
2018-05-03 14:23       ` Sinan Kaya
2018-05-03 14:23         ` Sinan Kaya
2018-05-03 22:15         ` Nadav Amit
2018-05-03 22:15           ` Nadav Amit
2018-05-03 22:15           ` Nadav Amit
2018-05-03 22:52         ` Bjorn Helgaas
2018-05-03 22:52           ` Bjorn Helgaas
2018-05-10 23:09 ` Bjorn Helgaas
2018-05-10 23:09   ` Bjorn Helgaas

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