From: Jean-Philippe Brucker <jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
To: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: mark.rutland-5wv7dgnIgG8@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
will.deacon-5wv7dgnIgG8@public.gmane.org,
sudeep.holla-5wv7dgnIgG8@public.gmane.org,
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okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
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sunil.kovvuri-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
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lenb-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org
Subject: Re: [PATCH 2/7] dt-bindings: PCI: Describe ATS property for root complex nodes
Date: Tue, 20 Jun 2017 12:38:26 +0100 [thread overview]
Message-ID: <1754b317-767e-7afd-5608-6ef6ea80a162@arm.com> (raw)
In-Reply-To: <65aea93f-d516-f045-f216-3f56e96bdeb6-5wv7dgnIgG8@public.gmane.org>
On 06/06/2017 12:11 PM, Jean-Philippe Brucker wrote:
> On 05/06/17 18:20, Rob Herring wrote:
>> pci-host-{e,}cam-generic is a special case. I'm okay with having a
>> property for that I suppose. We should not require this property though
>> and allow for it to be implied by the SoC specific compatible as well.
>
> The property isn't useful for host-generic since a host like Qemu can
> easily disable ATS in the IOMMU. It would only be here for consistency.
> Changing IOMMU registers wouldn't be as simple for a firmware running on
> real hardware.
Sorry I was mistaken here. AMD Seattle hardware, for instance, implements
a pure host-ecam-generic. So it's not exclusively used by Qemu. A quick
search in the kernel also brings up alpine and thunder2. So I guess I'll
move ats-supported documentation to host-generic-pci.txt.
Thanks,
Jean
next prev parent reply other threads:[~2017-06-20 11:38 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-24 18:01 [PATCH 0/7] Add PCI ATS support to SMMUv3 Jean-Philippe Brucker
2017-05-24 18:01 ` [PATCH 1/7] PCI: Move ATS declarations outside of CONFIG_PCI Jean-Philippe Brucker
2017-05-24 18:01 ` [PATCH 3/7] iommu/of: Check ATS capability in root complex nodes Jean-Philippe Brucker
[not found] ` <20170524180143.19855-1-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2017-05-24 18:01 ` [PATCH 2/7] dt-bindings: PCI: Describe ATS property for " Jean-Philippe Brucker
2017-05-30 10:01 ` Joerg Roedel
2017-05-30 10:58 ` Jean-Philippe Brucker
[not found] ` <035be7ba-e850-a5a9-08fa-802a04feb600-5wv7dgnIgG8@public.gmane.org>
2017-05-31 17:17 ` Rob Herring
[not found] ` <20170524180143.19855-3-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2017-05-31 17:23 ` Rob Herring
2017-06-01 12:28 ` Jean-Philippe Brucker
2017-06-05 17:20 ` Rob Herring
2017-06-06 11:11 ` Jean-Philippe Brucker
[not found] ` <65aea93f-d516-f045-f216-3f56e96bdeb6-5wv7dgnIgG8@public.gmane.org>
2017-06-20 11:38 ` Jean-Philippe Brucker [this message]
2017-05-24 18:01 ` [PATCH 4/7] ACPI/IORT: Check ATS capability in " Jean-Philippe Brucker
2017-05-24 18:01 ` [PATCH 5/7] iommu/arm-smmu-v3: Link domains and devices Jean-Philippe Brucker
2017-05-24 18:01 ` [PATCH 6/7] iommu/arm-smmu-v3: Add support for PCI ATS Jean-Philippe Brucker
[not found] ` <20170524180143.19855-7-jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
2017-05-30 10:28 ` Joerg Roedel
2017-05-30 10:58 ` Jean-Philippe Brucker
2017-05-24 18:01 ` [PATCH 7/7] iommu/arm-smmu-v3: Disable tagged pointers Jean-Philippe Brucker
2017-05-31 15:27 ` [PATCH 0/7] Add PCI ATS support to SMMUv3 Nate Watterson
2017-06-01 12:23 ` Jean-Philippe Brucker
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