From mboxrd@z Thu Jan 1 00:00:00 1970 From: mathieu.poirier@linaro.org (mathieu.poirier at linaro.org) Date: Fri, 30 Jan 2015 15:54:25 -0700 Subject: [PATCH 1/2] arm64: adding cpu lookup functionality In-Reply-To: <1422658466-23984-1-git-send-email-mathieu.poirier@linaro.org> References: <1422658466-23984-1-git-send-email-mathieu.poirier@linaro.org> Message-ID: <1422658466-23984-2-git-send-email-mathieu.poirier@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Mathieu Poirier 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 --- 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 #include 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