From mboxrd@z Thu Jan 1 00:00:00 1970 From: mark.rutland@arm.com (Mark Rutland) Date: Mon, 18 May 2015 11:38:13 +0100 Subject: [PATCHv2 02/12] arm64: smp_plat: add get_logical_index In-Reply-To: <1431945503-6939-1-git-send-email-mark.rutland@arm.com> References: <1431945503-6939-1-git-send-email-mark.rutland@arm.com> Message-ID: <1431945503-6939-3-git-send-email-mark.rutland@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Acked-by: Lorenzo Pieralisi Cc: Catalin Marinas Cc: Will Deacon --- arch/arm64/include/asm/smp_plat.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arm64/include/asm/smp_plat.h b/arch/arm64/include/asm/smp_plat.h index 8dcd61e..7abf757 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 + #include 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); -- 1.9.1