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

Will Deacon
2020-09-02T08:57:25Z

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@amazon.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