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Subject[PATCH 1/2] arm64: adding cpu lookup functionality
Date
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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