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arm64: consistently log boot/secondary CPU IDs 

Currently we inconsistently log identifying information for the boot CPU
and secondary CPUs. For the boot CPU, we log the MIDR and MPIDR across
separate messages, whereas for the secondary CPUs we only log the MIDR.

In some cases, it would be useful to know the MPIDR of secondary CPUs,
and it would be nice for these messages to be consistent.

This patch ensures that in the primary and secondary boot paths, we log
both the MPIDR and MIDR in a single message, with a consistent format.
the MPIDR is consistently padded to 10 hex characters to cover Aff3 in
bits 39:32, so that IDs can be compared easily.

The newly redundant message in setup_arch() is removed.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Al Stone <ahs3@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
[will: added '0x' prefixes consistently]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2017-09-27 14:50:38 +01:00 committed by Will Deacon
parent b65423ed46
commit ccaac16287
2 changed files with 6 additions and 5 deletions
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5
arch/arm64/kernel/setup.c
View File

@ -102,7 +102,8 @@ void __init smp_setup_processor_id(void)
* access percpu variable inside lock_release
*/
set_my_cpu_offset(0);
pr_info("Booting Linux on physical CPU 0x%lx\n", (unsigned long)mpidr);
pr_info("Booting Linux on physical CPU 0x%010lx [0x%08x]\n",
(unsigned long)mpidr, read_cpuid_id());
}
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
@ -243,8 +244,6 @@ u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
void __init setup_arch(char **cmdline_p)
{
pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());
init_mm.start_code = (unsigned long) _text;
init_mm.end_code = (unsigned long) _etext;
init_mm.end_data = (unsigned long) _edata;

6
arch/arm64/kernel/smp.c
View File

@ -216,6 +216,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
*/
asmlinkage void secondary_start_kernel(void)
{
u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
struct mm_struct *mm = &init_mm;
unsigned int cpu;
@ -265,8 +266,9 @@ asmlinkage void secondary_start_kernel(void)
* the CPU migration code to notice that the CPU is online
* before we continue.
*/
pr_info("CPU%u: Booted secondary processor [%08x]\n",
cpu, read_cpuid_id());
pr_info("CPU%u: Booted secondary processor 0x%010lx [0x%08x]\n",
cpu, (unsigned long)mpidr,
read_cpuid_id());
update_cpu_boot_status(CPU_BOOT_SUCCESS);
set_cpu_online(cpu, true);
complete(&cpu_running);