Unverified Commit a3313375 authored by Yunhui Cui's avatar Yunhui Cui Committed by Alexandre Ghiti
Browse files

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: default avatarYunhui Cui <cuiyunhui@bytedance.com>
Reviewed-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20250303083424.14309-1-cuiyunhui@bytedance.com


Signed-off-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
parent 74f4bf9d

arch/riscv/kernel/smp.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

arch/riscv/kernel/smpboot.c

+4 −0
Original line number Diff line number Diff line
@@ -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);



	/*