linux-kernel - Re: [PATCH v3 1/3] RISC-V: Add RISC-V specific arch_match_cpu_phys

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Date:   Wed, 24 Apr 2019 10:07:12 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Atish Patra <atish.patra@....com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andreas Schwab <schwab@...e.de>,
        Anup Patel <anup@...infault.org>,
        Dmitriy Cherkasov <dmitriy@...-tech.org>,
        Johan Hovold <johan@...nel.org>,
        linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christoph Hellwig <hch@...radead.org>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v3 1/3] RISC-V: Add RISC-V specific arch_match_cpu_phys_id

On Wed, Apr 24, 2019 at 1:03 AM Atish Patra <atish.patra@....com> wrote:
>
> OF/DT core has a hook for architecture specific logical cpuid to hartid
> mapping. By implementing this, we can pass the logical cpu id to cpu
> node parsing functions.
>
> Fix the instances where logical cpuid is expected as an argument in
> of_get_cpu_node.
>

Reviewed-by: Sudeep Holla <sudeep.holla@....com>

> Signed-off-by: Atish Patra <atish.patra@....com>
> ---
>  arch/riscv/kernel/cpu.c | 3 +--
>  arch/riscv/kernel/smp.c | 5 +++++
>  2 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> index cf2fca12414a..c8d2a3223099 100644
> --- a/arch/riscv/kernel/cpu.c
> +++ b/arch/riscv/kernel/cpu.c
> @@ -136,8 +136,7 @@ static void c_stop(struct seq_file *m, void *v)
>  static int c_show(struct seq_file *m, void *v)
>  {
>         unsigned long cpu_id = (unsigned long)v - 1;
> -       struct device_node *node = of_get_cpu_node(cpuid_to_hartid_map(cpu_id),
> -                                                  NULL);

I assume it work working just fine as you are doing cpu to hartid
conversion here and
weak implementation of arch_match_cpu_phys_id does direct match.

> +       struct device_node *node = of_get_cpu_node(cpu_id, NULL);
>         const char *compat, *isa, *mmu;
>
>         seq_printf(m, "processor\t: %lu\n", cpu_id);
> diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
> index 0c41d07ec281..94db72662f60 100644
> --- a/arch/riscv/kernel/smp.c
> +++ b/arch/riscv/kernel/smp.c
> @@ -70,6 +70,11 @@ void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out)
>         for_each_cpu(cpu, in)
>                 cpumask_set_cpu(cpuid_to_hartid_map(cpu), out);
>  }
> +
> +bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
> +{
> +       return phys_id == cpuid_to_hartid_map(cpu);
> +}
>  /* Unsupported */
>  int setup_profiling_timer(unsigned int multiplier)
>  {
> --
> 2.21.0
>