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| author | Yunhui Cui <cuiyunhui@bytedance.com> | 2025-03-03 16:34:24 +0800 |
|---|---|---|
| committer | Alexandre Ghiti <alexghiti@rivosinc.com> | 2025-04-01 07:03:03 +0000 |
| commit | a3313375e88e0075b9048eba15e5eb4dbf93f60e (patch) | |
| tree | 6d5e538134193e4c66dff10f00df73bf4f1a84e8 /arch | |
| parent | 74f4bf9d15ad1d6862b828d486ed10ea0e874a23 (diff) | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/kernel/smp.c | 2 | ||||
| -rw-r--r-- | arch/riscv/kernel/smpboot.c | 4 |
2 files changed, 6 insertions, 0 deletions
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..601a321e0f17 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_debug("CPU%u: Booted secondary hartid %lu\n", curr_cpuid, + cpuid_to_hartid_map(curr_cpuid)); + set_cpu_online(curr_cpuid, true); /* |