linux-kernel - Re: [PATCH v3 2/3] drivers/perf: riscv: Reset the counter to hpmevent mapping while starting cpus

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Date: Wed, 26 Jun 2024 17:37:07 +0100
From: Conor Dooley <conor@...nel.org>
To: Atish Kumar Patra <atishp@...osinc.com>
Cc: Samuel Holland <samuel.holland@...ive.com>,
	linux-riscv@...ts.infradead.org, kvm-riscv@...ts.infradead.org,
	Atish Patra <atishp@...shpatra.org>,
	Anup Patel <anup@...infault.org>, Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH v3 2/3] drivers/perf: riscv: Reset the counter to
 hpmevent mapping while starting cpus

On Wed, Jun 26, 2024 at 09:18:46AM -0700, Atish Kumar Patra wrote:
> On Wed, Jun 26, 2024 at 6:24 AM Samuel Holland
> <samuel.holland@...ive.com> wrote:
> >
> > On 2024-06-26 2:23 AM, Atish Patra wrote:
> > > From: Samuel Holland <samuel.holland@...ive.com>
> > >
> > > Currently, we stop all the counters while a new cpu is brought online.
> > > However, the hpmevent to counter mappings are not reset. The firmware may
> > > have some stale encoding in their mapping structure which may lead to
> > > undesirable results. We have not encountered such scenario though.
> > >
> >
> > This needs:
> >
> > Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
> >
> 
> Oops. Sorry I missed that.
> 
> @Alexandre Ghiti

What's Alex going to be able to do?

> @Palmer Dabbelt : Can you add that while picking up
> the patch or should I respin a v4 ?

b4 should pick the signoff up though. "perf: RISC-V: Check standard
event availability" seems to be missing your signoff though...

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