APPLIED[G]: [SRU-v2][AWS-{B,F,G}] enable PCI write-combine for arm64

[Seth Forshee]

On Wed, Oct 07, 2020 at 01:11:18PM -0700, Kamal Mostafa wrote:
> ***
> *** [SRU-v2] This is a re-submit of a patch that I retracted last month,
> *** pending upstream discussion.  Upstream is now prepared to accept it.
> ***
> *** This was ACK'ed by Stefan and Andrea (2020/09/03) and those ACK's
> *** are pre-applied here, as the patch is unchanged.
> ***
> *** SRU template and supporting details are in the bug link:
> ***
> 
> BugLink: https://bugs.launchpad.net/bugs/1893817
> 
> To improve PCI performance on arm64 AWS instances, enable arch_can_pci_mmap_wc()
> via the patch:
> 
>   From: Clint Sbisa <csbisa at amazon.com>
>   Subject: [PATCH] arm64: Enable PCI write-combine resources under sysfs
> 
>   https://lore.kernel.org/linux-pci/20200831151827.pumm2p54fyj7fz5s@amazon.com/
> 
> 
> Supplied here are two versions of this one-liner patch:
>     [PATCH][AWS-B]       <--  for linux-aws/bionic master (v4.15)
>     [PATCH][AWS-{F,G}]   <--  for linux-aws/{focal and groovy} master
> 
> I have smoke-tested this on AWS ARM instances.
> 
>  -Kamal

Applied for groovy. Thanks!

Seth