linux-kernel - Re: [PATCH] riscv: print hartid on bringup

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Message-ID: <CAEEQ3w=uYad7UAedSU4M_L277v=RQGWHpJQwOW-p7W6=hcijsQ@mail.gmail.com>
Date: Thu, 20 Feb 2025 20:54:01 +0800
From: yunhui cui <cuiyunhui@...edance.com>
To: apatel@...tanamicro.com, atishp@...osinc.com, paul.walmsley@...ive.com, 
	palmer@...belt.com, aou@...s.berkeley.edu, cuiyunhui@...edance.com, 
	samuel.holland@...ive.com, alexghiti@...osinc.com, jassisinghbrar@...il.com, 
	takakura@...inux.co.jp, valentina.fernandezalanis@...rochip.com, 
	ruanjinjie@...wei.com, charlie@...osinc.com, conor.dooley@...rochip.com, 
	haibo1.xu@...el.com, andybnac@...il.com, ke.zhao@...ngroup.cn, 
	tglx@...utronix.de, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: print hartid on bringup

Hi All,

Gentle ping. Any comments on this patch?

On Sat, Feb 1, 2025 at 7:06 PM Yunhui Cui <cuiyunhui@...edance.com> wrote:
>
> Firmware randomly releases cores, so CPU numbers don't linearly map
> to hartids. When the system has an exception, we care more about hartids.
>
> Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
> ---
>  arch/riscv/kernel/smp.c     | 2 ++
>  arch/riscv/kernel/smpboot.c | 4 ++++
>  2 files changed, 6 insertions(+)
>
> diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
> index d58b5e751286..e650dec44817 100644
> --- a/arch/riscv/kernel/smp.c
> +++ b/arch/riscv/kernel/smp.c
> @@ -48,6 +48,8 @@ EXPORT_SYMBOL_GPL(__cpuid_to_hartid_map);
>  void __init smp_setup_processor_id(void)
>  {
>         cpuid_to_hartid_map(0) = boot_cpu_hartid;
> +
> +       pr_info("Booting Linux on hartid %lu\n", boot_cpu_hartid);
>  }
>
>  static DEFINE_PER_CPU_READ_MOSTLY(int, ipi_dummy_dev);
> diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> index e36d20205bd7..beba0efb00b9 100644
> --- a/arch/riscv/kernel/smpboot.c
> +++ b/arch/riscv/kernel/smpboot.c
> @@ -231,6 +231,10 @@ asmlinkage __visible void smp_callin(void)
>         riscv_ipi_enable();
>
>         numa_add_cpu(curr_cpuid);
> +
> +       pr_info("CPU%u: Booted secondary hartid %lu\n", curr_cpuid,
> +               cpuid_to_hartid_map(curr_cpuid));
> +
>         set_cpu_online(curr_cpuid, true);
>
>         /*
> --
> 2.39.2
>

Thanks,
Yunhui