linux-kernel - Re: [RFC 2/9] drivers/perf: riscv: Add a flag to indicate SBI v2.0 support

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Message-ID: <CAHBxVyFZvXo8pDLz_6jbowQt49N377WaRif55ZdQoq_WB5NTgg@mail.gmail.com>
Date: Sat, 16 Dec 2023 15:54:11 -0800
From: Atish Kumar Patra <atishp@...osinc.com>
To: Anup Patel <anup@...infault.org>
Cc: Conor Dooley <conor.dooley@...rochip.com>, linux-kernel@...r.kernel.org, 
	Alexandre Ghiti <alexghiti@...osinc.com>, Andrew Jones <ajones@...tanamicro.com>, 
	Atish Patra <atishp@...shpatra.org>, Guo Ren <guoren@...nel.org>, 
	Icenowy Zheng <uwu@...nowy.me>, kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org, 
	linux-riscv@...ts.infradead.org, Mark Rutland <mark.rutland@....com>, 
	Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Will Deacon <will@...nel.org>
Subject: Re: [RFC 2/9] drivers/perf: riscv: Add a flag to indicate SBI v2.0 support

On Thu, Dec 14, 2023 at 4:16 AM Anup Patel <anup@...infault.org> wrote:
>
> On Thu, Dec 7, 2023 at 5:39 PM Conor Dooley <conor.dooley@...rochip.com> wrote:
> >
> > On Mon, Dec 04, 2023 at 06:43:03PM -0800, Atish Patra wrote:
> > > SBI v2.0 added few functions to improve SBI PMU extension. In order
> > > to be backward compatible, the driver must use these functions only
> > > if SBI v2.0 is available.
> > >
> > > Signed-off-by: Atish Patra <atishp@...osinc.com>
> >
> > IMO this does not make sense in a patch of its own and should probably
> > be squashed with the first user for it.
>
> I agree. This patch should be squashed into patch4 where the
> flag is first used.
>

Done. Thanks.


> Regards,
> Anup
>
> >
> > > ---
> > >  drivers/perf/riscv_pmu_sbi.c | 5 +++++
> > >  1 file changed, 5 insertions(+)
> > >
> > > diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
> > > index 16acd4dcdb96..40a335350d08 100644
> > > --- a/drivers/perf/riscv_pmu_sbi.c
> > > +++ b/drivers/perf/riscv_pmu_sbi.c
> > > @@ -35,6 +35,8 @@
> > >  PMU_FORMAT_ATTR(event, "config:0-47");
> > >  PMU_FORMAT_ATTR(firmware, "config:63");
> > >
> > > +static bool sbi_v2_available;
> > > +
> > >  static struct attribute *riscv_arch_formats_attr[] = {
> > >       &format_attr_event.attr,
> > >       &format_attr_firmware.attr,
> > > @@ -1108,6 +1110,9 @@ static int __init pmu_sbi_devinit(void)
> > >               return 0;
> > >       }
> > >
> > > +     if (sbi_spec_version >= sbi_mk_version(2, 0))
> > > +             sbi_v2_available = true;
> > > +
> > >       ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_RISCV_STARTING,
> > >                                     "perf/riscv/pmu:starting",
> > >                                     pmu_sbi_starting_cpu, pmu_sbi_dying_cpu);
> > > --
> > > 2.34.1
> > >