linux-kernel - Re: [PATCH v2 -next 2/2] RISC-V/perf: Use standard interface to get INTC domain

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Message-ID: <CAOnJCU+F8LL_s=nRgWvONAJRK33PyHG=6DV+J9L+uNkT3-A2Jg@mail.gmail.com>
Date:   Wed, 7 Jun 2023 16:19:47 -0700
From:   Atish Patra <atishp@...shpatra.org>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v2 -next 2/2] RISC-V/perf: Use standard interface to get
 INTC domain

On Wed, Jun 7, 2023 at 4:24 AM Sunil V L <sunilvl@...tanamicro.com> wrote:
>
> Currently the PMU driver is using DT based lookup to
> find the INTC node for sscofpmf extension. This will not work
> for ACPI based systems causing the driver to fail to register
> the PMU overflow interrupt handler.
>
> Hence, change the code to use the standard interface to find
> the INTC node which works irrespective of DT or ACPI.
>
> Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  drivers/perf/riscv_pmu_sbi.c | 17 ++---------------
>  1 file changed, 2 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
> index 4f3ac296b3e2..0bc491252a44 100644
> --- a/drivers/perf/riscv_pmu_sbi.c
> +++ b/drivers/perf/riscv_pmu_sbi.c
> @@ -739,7 +739,6 @@ static int pmu_sbi_setup_irqs(struct riscv_pmu *pmu, struct platform_device *pde
>  {
>         int ret;
>         struct cpu_hw_events __percpu *hw_events = pmu->hw_events;
> -       struct device_node *cpu, *child;
>         struct irq_domain *domain = NULL;
>
>         if (riscv_isa_extension_available(NULL, SSCOFPMF)) {
> @@ -756,20 +755,8 @@ static int pmu_sbi_setup_irqs(struct riscv_pmu *pmu, struct platform_device *pde
>         if (!riscv_pmu_use_irq)
>                 return -EOPNOTSUPP;
>
> -       for_each_of_cpu_node(cpu) {
> -               child = of_get_compatible_child(cpu, "riscv,cpu-intc");
> -               if (!child) {
> -                       pr_err("Failed to find INTC node\n");
> -                       of_node_put(cpu);
> -                       return -ENODEV;
> -               }
> -               domain = irq_find_host(child);
> -               of_node_put(child);
> -               if (domain) {
> -                       of_node_put(cpu);
> -                       break;
> -               }
> -       }
> +       domain = irq_find_matching_fwnode(riscv_get_intc_hwnode(),
> +                                         DOMAIN_BUS_ANY);
>         if (!domain) {
>                 pr_err("Failed to find INTC IRQ root domain\n");
>                 return -ENODEV;
> --
> 2.34.1
>


Reviewed-by: Atish Patra <atishp@...osinc.com>
-- 
Regards,
Atish