From: Marc Zyngier <maz@kernel.org>
To: James Morse <james.morse@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [RFC PATCH 0/7] arm64: mm: Prototype to allow drivers to request PBHA values
Date: Sat, 16 Oct 2021 14:54:54 +0100 [thread overview]
Message-ID: <87a6j9ulap.wl-maz@kernel.org> (raw)
In-Reply-To: <20211015161416.2196-1-james.morse@arm.com>
Hi James,
On Fri, 15 Oct 2021 17:14:09 +0100,
James Morse <james.morse@arm.com> wrote:
>
> Hello!
>
> Do you have hardware that uses PBHA? If so, what does the SoC do in
> response to which bits, and what workload needs that behaviour?
>
> This series is a start at trying to work out what linux needs to
> support to makeuse of existing SoCs using PBHA.
Thanks for starting this.
I think one part that is missing here is the device side of things.
How do these attributes get used by the SMMU, how do we convey them to
the DMA layer, and what is the expected behaviour when we have SVA?
Not having any guidance form the architecture means that we're walking
on very thin ice...
M.
--
Without deviation from the norm, progress is not possible.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
prev parent reply other threads:[~2021-10-16 13:56 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-15 16:14 [RFC PATCH 0/7] arm64: mm: Prototype to allow drivers to request PBHA values James Morse
2021-10-15 16:14 ` [RFC PATCH 1/7] KVM: arm64: Detect and enable PBHA for stage2 James Morse
2021-10-16 13:27 ` Marc Zyngier
2021-10-18 17:26 ` James Morse
2021-10-15 16:14 ` [RFC PATCH 2/7] dt-bindings: Rename the description of cpu nodes cpu.yaml James Morse
2021-10-15 16:14 ` [RFC PATCH 3/7] dt-bindings: arm: Add binding for Page Based Hardware Attributes James Morse
2021-10-15 16:14 ` [RFC PATCH 4/7] arm64: cpufeature: Enable PBHA bits for stage1 James Morse
2021-10-16 13:50 ` Marc Zyngier
2021-10-18 17:26 ` James Morse
2021-10-15 16:14 ` [RFC PATCH 5/7] arm64: mm: Add pgprot_pbha() to allow drivers to request PBHA values James Morse
2021-10-15 16:14 ` [RFC PATCH 6/7] KVM: arm64: Configure PBHA bits for stage2 James Morse
2021-10-16 13:46 ` Marc Zyngier
2021-10-15 16:14 ` [RFC PATCH 7/7] Documentation: arm64: Describe the support and expectations for PBHA James Morse
2021-10-16 13:54 ` Marc Zyngier [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87a6j9ulap.wl-maz@kernel.org \
--to=maz@kernel.org \
--cc=catalin.marinas@arm.com \
--cc=james.morse@arm.com \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).