From: Chris Smart
> Sent: 28 April 2016 00:52
...
> >In that case what actually completes the copy?
> >I think you'd need to be inside a 'restartable atomic sequence'
> >in which case the cp_abort need only be done when the/a RAS
> >block is detected.
> >
> >Or have I missed something??
>
> It's u
On Tue, 2016-26-04 at 00:28:50 UTC, Chris Smart wrote:
> The copy paste facility introduced in POWER9 provides an optimised
> mechanism for a userspace application to copy a cacheline. This is
> provided by a pair of instructions, copy and paste, while a third,
> cp_abort (copy paste abort), provid
On Wed, Apr 27, 2016 at 03:25:59PM +, David Laight wrote:
From: Chris Smart
Sent: 26 April 2016 01:29
The copy paste facility introduced in POWER9 provides an optimised
mechanism for a userspace application to copy a cacheline. This is
provided by a pair of instructions, copy and paste, whil
From: Chris Smart
> Sent: 26 April 2016 01:29
> The copy paste facility introduced in POWER9 provides an optimised
> mechanism for a userspace application to copy a cacheline. This is
> provided by a pair of instructions, copy and paste, while a third,
> cp_abort (copy paste abort), provides a clea
On Tue, 2016-04-26 at 17:45 +1000, Balbir Singh wrote:
> >
> > /*
> > * System calls.
> > @@ -508,6 +509,14 @@ BEGIN_FTR_SECTION
> > ldarxr6,0,r1
> > END_FTR_SECTION_IFSET(CPU_FTR_STCX_CHECKS_ADDRESS)
> >
> > +BEGIN_FTR_SECTION
> > +/*
> > + * A cp_abort (copy paste abort) here ensures t
> /*
> * System calls.
> @@ -508,6 +509,14 @@ BEGIN_FTR_SECTION
> ldarxr6,0,r1
> END_FTR_SECTION_IFSET(CPU_FTR_STCX_CHECKS_ADDRESS)
>
> +BEGIN_FTR_SECTION
> +/*
> + * A cp_abort (copy paste abort) here ensures that when context switching, a
> + * copy from one process can't leak into the
On Tue, Apr 26, 2016 at 04:42:09PM +1000, Cyril Bur wrote:
Hi Chris,
Patch looks good. Looks like you've put 8 spaces (instead of a tab) on the
PPC_CP_ABORT line.
Argh. I'm not sure how that happened, thanks.
Apart from that,
Reviewed-by: Cyril Bur
Cheers,
-c
__
On Tue, 26 Apr 2016 10:28:50 +1000
Chris Smart wrote:
> The copy paste facility introduced in POWER9 provides an optimised
> mechanism for a userspace application to copy a cacheline. This is
> provided by a pair of instructions, copy and paste, while a third,
> cp_abort (copy paste abort), provi
The copy paste facility introduced in POWER9 provides an optimised
mechanism for a userspace application to copy a cacheline. This is
provided by a pair of instructions, copy and paste, while a third,
cp_abort (copy paste abort), provides a clean up of the state in case of
a failure.
The copy ins
