forked from Minki/linux
f6e763b93a
Add basic CPU topology support to arm64, based on the existing pre-v8 code and some work done by Mark Hambleton. This patch does not implement any topology discovery support since that should be based on information from firmware, it merely implements the scaffolding for integration of topology support in the architecture. No locking of the topology data is done since it is only modified during CPU bringup with external serialisation from the SMP code. The goal is to separate the architecture hookup for providing topology information from the DT parsing in order to ease review and avoid blocking the architecture code (which will be built on by other work) with the DT code review by providing something simple and basic. Following patches will implement support for interpreting topology information from MPIDR and for parsing the DT topology bindings for ARM, similar patches will be needed for ACPI. Signed-off-by: Mark Brown <broonie@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> [catalin.marinas@arm.com: removed CONFIG_CPU_TOPOLOGY, always on if SMP] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
40 lines
982 B
C
40 lines
982 B
C
#ifndef __ASM_TOPOLOGY_H
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#define __ASM_TOPOLOGY_H
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#ifdef CONFIG_SMP
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#include <linux/cpumask.h>
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struct cpu_topology {
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int thread_id;
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int core_id;
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int cluster_id;
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cpumask_t thread_sibling;
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cpumask_t core_sibling;
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};
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extern struct cpu_topology cpu_topology[NR_CPUS];
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#define topology_physical_package_id(cpu) (cpu_topology[cpu].cluster_id)
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#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
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#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
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#define topology_thread_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
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#define mc_capable() (cpu_topology[0].cluster_id != -1)
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#define smt_capable() (cpu_topology[0].thread_id != -1)
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void init_cpu_topology(void);
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void store_cpu_topology(unsigned int cpuid);
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const struct cpumask *cpu_coregroup_mask(int cpu);
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#else
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static inline void init_cpu_topology(void) { }
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static inline void store_cpu_topology(unsigned int cpuid) { }
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#endif
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#include <asm-generic/topology.h>
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#endif /* _ASM_ARM_TOPOLOGY_H */
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