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

[Kamal Mostafa]

***
*** [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

-----

Clint Sbisa (1):
  UBUNTU: SAUCE: arm64: Enable PCI write-combine resources under sysfs

 arch/arm64/include/asm/pci.h | 1 +
 1 file changed, 1 insertion(+)

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2.17.1