Messages in this thread | | | Date | Mon, 2 Feb 2015 14:20:09 -0700 | Subject | Re: [PATCH 1/2] arm64: adding cpu lookup functionality | From | Mathieu Poirier <> |
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On 2 February 2015 at 06:50, Will Deacon <will.deacon@arm.com> wrote: > On Fri, Jan 30, 2015 at 10:54:25PM +0000, mathieu.poirier@linaro.org wrote: >> 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; >> +} > > Can you not achieve the same thing using arch_find_n_match_cpu_physical_id > in the coresight code? > > Will
I ended up using "of_get_cpu_node()", which uses "arch_find_n_match_cpu_physical_id()". Thanks for pointing this out.
Mathieu
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