| Message ID | 1353066105-19486-2-git-send-email-lorenzo.pieralisi@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, 16 Nov 2012, Lorenzo Pieralisi wrote: > The advent of big.LITTLE ARM platforms requires the kernel to be able > to identify the MIDRs of all online CPUs upon request. MIDRs are stashed > at boot time so that kernel subsystems can detect the MIDR of online CPUs > by simply retrieving per-CPU data updated by all booted CPUs. > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> > --- > arch/arm/include/asm/cpu.h | 1 + > arch/arm/kernel/smp.c | 1 + > 2 files changed, 2 insertions(+) > > diff --git a/arch/arm/include/asm/cpu.h b/arch/arm/include/asm/cpu.h > index d797223..2744f06 100644 > --- a/arch/arm/include/asm/cpu.h > +++ b/arch/arm/include/asm/cpu.h > @@ -15,6 +15,7 @@ > > struct cpuinfo_arm { > struct cpu cpu; > + u32 cpuid; > #ifdef CONFIG_SMP > unsigned int loops_per_jiffy; > #endif > diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c > index 9da08ce..eeb75e1 100644 > --- a/arch/arm/kernel/smp.c > +++ b/arch/arm/kernel/smp.c > @@ -282,6 +282,7 @@ static void __cpuinit smp_store_cpu_info(unsigned int cpuid) > struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); > > cpu_info->loops_per_jiffy = loops_per_jiffy; > + cpu_info->cpuid = read_cpuid_id(); > > store_cpu_topology(cpuid); > } > -- > 1.7.12 > >
diff --git a/arch/arm/include/asm/cpu.h b/arch/arm/include/asm/cpu.h index d797223..2744f06 100644 --- a/arch/arm/include/asm/cpu.h +++ b/arch/arm/include/asm/cpu.h @@ -15,6 +15,7 @@ struct cpuinfo_arm { struct cpu cpu; + u32 cpuid; #ifdef CONFIG_SMP unsigned int loops_per_jiffy; #endif diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 9da08ce..eeb75e1 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -282,6 +282,7 @@ static void __cpuinit smp_store_cpu_info(unsigned int cpuid) struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); cpu_info->loops_per_jiffy = loops_per_jiffy; + cpu_info->cpuid = read_cpuid_id(); store_cpu_topology(cpuid); }
The advent of big.LITTLE ARM platforms requires the kernel to be able to identify the MIDRs of all online CPUs upon request. MIDRs are stashed at boot time so that kernel subsystems can detect the MIDR of online CPUs by simply retrieving per-CPU data updated by all booted CPUs. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> --- arch/arm/include/asm/cpu.h | 1 + arch/arm/kernel/smp.c | 1 + 2 files changed, 2 insertions(+)