linux-kernel - Re: [PATCH] arm64: Enable PCI write-combine resources under sysfs

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Message-ID: <658051b1ba6533fef92648eba08dfdf240af7a18.camel@kernel.crashing.org>
Date:   Wed, 02 Sep 2020 09:22:53 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Bjorn Helgaas <helgaas@...nel.org>, Clint Sbisa <csbisa@...zon.com>
Cc:     linux-pci@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: Enable PCI write-combine resources under sysfs

On Tue, 2020-09-01 at 13:37 -0500, Bjorn Helgaas wrote:
> On Mon, Aug 31, 2020 at 03:18:27PM +0000, Clint Sbisa wrote:
> > Using write-combine is crucial for performance of PCI devices where
> > significant amounts of transactions go over PCI BARs.
> > 
> > arm64 supports write-combine PCI mappings, so the appropriate
> > define
> > has been added which will expose write-combine mappings under sysfs
> > for prefetchable PCI resources.
> > 
> > Signed-off-by: Clint Sbisa <csbisa@...zon.com>
> 
> Fine with me, I assume Will or Catalin will apply this.

Haha ! Client had sent it to them originally and I told him to resend
it to linux-pci, yourself and Lorenzo :-)

So the confusion is on me.

Will, Catalin, it's all yours. You should have the original patch in
your mbox already, otherwise:

https://patchwork.kernel.org/patch/11729875/

Cheers,
Ben.