Messages in this thread Patch in this message | | | From | mathieu.poirier@linaro ... | Subject | [PATCH 1/2] arm64: adding cpu lookup functionality | Date | Fri, 30 Jan 2015 15:54:25 -0700 |
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From: Mathieu Poirier <mathieu.poirier@linaro.org>
Adding a lookup function allowing for quick and easy mapping between processor HWID (as found, for example) in DT specifications and the CPU index known to the kernel.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> --- arch/arm64/include/asm/smp_plat.h | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/arm64/include/asm/smp_plat.h b/arch/arm64/include/asm/smp_plat.h index 59e282311b58..8e4b011303b1 100644 --- a/arch/arm64/include/asm/smp_plat.h +++ b/arch/arm64/include/asm/smp_plat.h @@ -19,6 +19,7 @@ #ifndef __ASM_SMP_PLAT_H #define __ASM_SMP_PLAT_H +#include <linux/cpumask.h> #include <asm/types.h> struct mpidr_hash { @@ -40,4 +41,15 @@ static inline u32 mpidr_hash_size(void) extern u64 __cpu_logical_map[NR_CPUS]; #define cpu_logical_map(cpu) __cpu_logical_map[cpu] +static inline int get_logical_index(u64 mpidr) +{ + int cpu; + + for (cpu = 0; cpu < nr_cpu_ids; cpu++) + if (cpu_logical_map(cpu) == mpidr) + return cpu; + return -EINVAL; +} + + #endif /* __ASM_SMP_PLAT_H */ -- 1.9.1
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