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

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Date:   Wed, 2 Sep 2020 09:57:18 +0100
From:   Will Deacon <will@...nel.org>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Clint Sbisa <csbisa@...zon.com>, linux-pci@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: Enable PCI write-combine resources under sysfs

On Wed, Sep 02, 2020 at 09:22:53AM +1000, Benjamin Herrenschmidt wrote:
> 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/

Yup, it's not the radar. We don't usually start queuing stuff until -rc3, so
I'm working through the backlog this week. Would like an Ack from Lorenzo,
though.

Will