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riscv: print hartid on bringup 

Firmware randomly releases cores, so CPU numbers don't linearly map
to hartids. When the system has an exception, we care more about hartids.
Adding "dyndbg="file smpboot.c +p" loglevel=8" to the cmdline can output
the hartid.

Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20250303083424.14309-1-cuiyunhui@bytedance.com
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
This commit is contained in:
Yunhui Cui 2025-03-03 16:34:24 +08:00 committed by Alexandre Ghiti
parent 74f4bf9d15
commit a3313375e8
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GPG Key ID: 643FB2BC9285EF8A
2 changed files with 6 additions and 0 deletions
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2
arch/riscv/kernel/smp.c
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@ -48,6 +48,8 @@ EXPORT_SYMBOL_GPL(__cpuid_to_hartid_map);
void __init smp_setup_processor_id(void) void __init smp_setup_processor_id(void)
{ {
cpuid_to_hartid_map(0) = boot_cpu_hartid; 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); static DEFINE_PER_CPU_READ_MOSTLY(int, ipi_dummy_dev);

4
arch/riscv/kernel/smpboot.c
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@ -231,6 +231,10 @@ asmlinkage __visible void smp_callin(void)
riscv_ipi_enable(); riscv_ipi_enable();
numa_add_cpu(curr_cpuid); numa_add_cpu(curr_cpuid);
pr_debug("CPU%u: Booted secondary hartid %lu\n", curr_cpuid,
cpuid_to_hartid_map(curr_cpuid));
set_cpu_online(curr_cpuid, true); set_cpu_online(curr_cpuid, true);
/* /*