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authorMark Rutland <mark.rutland@arm.com>2015-04-22 19:26:18 +0300
committerMark Rutland <mark.rutland@arm.com>2015-05-27 15:21:34 +0300
commit6ee3c78cecc795e87de9552baca76ea88292556d (patch)
treee0680ce27c20aca86ff005bf51a00716225ff55b /arch/arm64
parent538b9b25fa5dd372eeb3eabc85cb24d5df9e317b (diff)
downloadlinux-6ee3c78cecc795e87de9552baca76ea88292556d.tar.xz
arm64: smp_plat: add get_logical_index
The PSCI MIGRATE_INFO_UP_CPU call returns a physical ID, which we will need to map back to a Linux logical ID. Implement a reusable get_logical_index to map from a physical ID to a logical ID. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Cc: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/include/asm/smp_plat.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/smp_plat.h b/arch/arm64/include/asm/smp_plat.h
index 8dcd61e32176..7abf7570c00f 100644
--- a/arch/arm64/include/asm/smp_plat.h
+++ b/arch/arm64/include/asm/smp_plat.h
@@ -19,6 +19,8 @@
#ifndef __ASM_SMP_PLAT_H
#define __ASM_SMP_PLAT_H
+#include <linux/cpumask.h>
+
#include <asm/types.h>
struct mpidr_hash {
@@ -39,6 +41,20 @@ static inline u32 mpidr_hash_size(void)
*/
extern u64 __cpu_logical_map[NR_CPUS];
#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
+/*
+ * Retrieve logical cpu index corresponding to a given MPIDR.Aff*
+ * - mpidr: MPIDR.Aff* bits to be used for the look-up
+ *
+ * Returns the cpu logical index or -EINVAL on look-up error
+ */
+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;
+}
void __init do_post_cpus_up_work(void);