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 09:50:56 -0700
From:   Atish Patra <atish.patra@....com>
To:     Sudeep Holla <sudeep.holla@....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" <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>
Subject: Re: [PATCH v3 1/3] RISC-V: Add RISC-V specific arch_match_cpu_phys_id

On 4/24/19 2:07 AM, Sudeep Holla wrote:
> 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.
> 

Yup. That's correct.

Regards,
Atish
>> +       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
>>
>