Re: [PATCH rdma-next 1/2] arm64/io: add memcpy_toio_64

[Niklas Schnelle <schnelle@linux.ibm.com>]

On Thu, 2024-01-18 at 17:25 +0100, Niklas Schnelle wrote:
> On Thu, 2024-01-18 at 12:21 -0400, Jason Gunthorpe wrote:
> > On Thu, Jan 18, 2024 at 04:59:47PM +0100, Niklas Schnelle wrote:
> > > On Thu, 2024-01-18 at 10:00 -0400, Jason Gunthorpe wrote:
> > > > On Thu, Jan 18, 2024 at 02:46:40PM +0100, Niklas Schnelle wrote:
> > > 
---8<---
> > 
> > 
> > > I did test your patches too and by accident confirmed again that these
> > > do need commit 80df7d6af7f6 ("s390/pci: fix max size calculation in
> > > zpci_memcpy_toio()") from the s390 feature branch to get the mlx5
> > > driver to detect Write-Combining as supported. Note, as far as I know
> > > Alexander Gordeev is targeting that one for v6.8-rc2 since we had quite
> > > a few changes for v6.8-rc1.
> > 
> > OK, but we can still run these two things in parallel?
> > 
> > Jason
> 
> Sure, it's not worse without my patch than what we had before and
> clearly __iowrite64_copy() has been completely broken for ages without
> anyone noticing and is fixed by your patches even without my fix for
> the too strict issue in that at least it then copies what it is
> supposed to copy even if it does so with 8*8 byte stores.
> 
> Thanks,
> Niklas
> 

FYI Alexander ended up doing a second v6.8-rc1 pull request and my
change has now landed in Linus' tree as commit 80df7d6af7f6 ("s390/pci:
fix max size calculation in zpci_memcpy_toio()").

Thanks,
Niklas