[PATCH V10 2/6] arm: arm64: Add routine to determine cpuid of other cpus
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STALE3604d
From: Will Deacon <hidden>
Date: 2016-11-29 10:31:12
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linux-acpi
[adding Russell] On Wed, Nov 09, 2016 at 05:39:49PM -0600, Jeremy Linton wrote:
quoted hunk ↗ jump to hunk
It is helpful if we can read the cpuid/midr of other CPUs in the system independent of arm/arm64. Signed-off-by: Jeremy Linton <redacted> --- arch/arm/include/asm/cputype.h | 2 ++ arch/arm64/include/asm/cputype.h | 3 +++ 2 files changed, 5 insertions(+)diff --git a/arch/arm/include/asm/cputype.h b/arch/arm/include/asm/cputype.h index 522b5fe..31fb273 100644 --- a/arch/arm/include/asm/cputype.h +++ b/arch/arm/include/asm/cputype.h@@ -235,6 +235,8 @@ static inline unsigned int __attribute_const__ read_cpuid_mpidr(void) #define cpu_is_sa1100() (read_cpuid_part() == ARM_CPU_PART_SA1100) #define cpu_is_sa1110() (read_cpuid_part() == ARM_CPU_PART_SA1110) +#define read_specific_cpuid(cpu_num) per_cpu_ptr(&cpu_data, cpu_num)->cpuid + /* * Intel's XScale3 core supports some v6 features (supersections, L2) * but advertises itself as v5 as it does not support the v6 ISA. For
Russell -- are you ok with adding this macro to arch/arm/? It will get used by the CPU PMU driver, which needs a portable (i.e. between arm and arm64) way to convert a logical CPU ID into the MIDR register for that CPU. Thanks, Will