diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/kernel/topology.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/kernel/topology.c | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/ANDROID_3.4.5/arch/arm/kernel/topology.c b/ANDROID_3.4.5/arch/arm/kernel/topology.c deleted file mode 100644 index 8200deaa..00000000 --- a/ANDROID_3.4.5/arch/arm/kernel/topology.c +++ /dev/null @@ -1,148 +0,0 @@ -/* - * arch/arm/kernel/topology.c - * - * Copyright (C) 2011 Linaro Limited. - * Written by: Vincent Guittot - * - * based on arch/sh/kernel/topology.c - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#include <linux/cpu.h> -#include <linux/cpumask.h> -#include <linux/init.h> -#include <linux/percpu.h> -#include <linux/node.h> -#include <linux/nodemask.h> -#include <linux/sched.h> - -#include <asm/cputype.h> -#include <asm/topology.h> - -#define MPIDR_SMP_BITMASK (0x3 << 30) -#define MPIDR_SMP_VALUE (0x2 << 30) - -#define MPIDR_MT_BITMASK (0x1 << 24) - -/* - * These masks reflect the current use of the affinity levels. - * The affinity level can be up to 16 bits according to ARM ARM - */ - -#define MPIDR_LEVEL0_MASK 0x3 -#define MPIDR_LEVEL0_SHIFT 0 - -#define MPIDR_LEVEL1_MASK 0xF -#define MPIDR_LEVEL1_SHIFT 8 - -#define MPIDR_LEVEL2_MASK 0xFF -#define MPIDR_LEVEL2_SHIFT 16 - -struct cputopo_arm cpu_topology[NR_CPUS]; - -const struct cpumask *cpu_coregroup_mask(int cpu) -{ - return &cpu_topology[cpu].core_sibling; -} - -/* - * store_cpu_topology is called at boot when only one cpu is running - * and with the mutex cpu_hotplug.lock locked, when several cpus have booted, - * which prevents simultaneous write access to cpu_topology array - */ -void store_cpu_topology(unsigned int cpuid) -{ - struct cputopo_arm *cpuid_topo = &cpu_topology[cpuid]; - unsigned int mpidr; - unsigned int cpu; - - /* If the cpu topology has been already set, just return */ - if (cpuid_topo->core_id != -1) - return; - - mpidr = read_cpuid_mpidr(); - - /* create cpu topology mapping */ - if ((mpidr & MPIDR_SMP_BITMASK) == MPIDR_SMP_VALUE) { - /* - * This is a multiprocessor system - * multiprocessor format & multiprocessor mode field are set - */ - - if (mpidr & MPIDR_MT_BITMASK) { - /* core performance interdependency */ - cpuid_topo->thread_id = (mpidr >> MPIDR_LEVEL0_SHIFT) - & MPIDR_LEVEL0_MASK; - cpuid_topo->core_id = (mpidr >> MPIDR_LEVEL1_SHIFT) - & MPIDR_LEVEL1_MASK; - cpuid_topo->socket_id = (mpidr >> MPIDR_LEVEL2_SHIFT) - & MPIDR_LEVEL2_MASK; - } else { - /* largely independent cores */ - cpuid_topo->thread_id = -1; - cpuid_topo->core_id = (mpidr >> MPIDR_LEVEL0_SHIFT) - & MPIDR_LEVEL0_MASK; - cpuid_topo->socket_id = (mpidr >> MPIDR_LEVEL1_SHIFT) - & MPIDR_LEVEL1_MASK; - } - } else { - /* - * This is an uniprocessor system - * we are in multiprocessor format but uniprocessor system - * or in the old uniprocessor format - */ - cpuid_topo->thread_id = -1; - cpuid_topo->core_id = 0; - cpuid_topo->socket_id = -1; - } - - /* update core and thread sibling masks */ - for_each_possible_cpu(cpu) { - struct cputopo_arm *cpu_topo = &cpu_topology[cpu]; - - if (cpuid_topo->socket_id == cpu_topo->socket_id) { - cpumask_set_cpu(cpuid, &cpu_topo->core_sibling); - if (cpu != cpuid) - cpumask_set_cpu(cpu, - &cpuid_topo->core_sibling); - - if (cpuid_topo->core_id == cpu_topo->core_id) { - cpumask_set_cpu(cpuid, - &cpu_topo->thread_sibling); - if (cpu != cpuid) - cpumask_set_cpu(cpu, - &cpuid_topo->thread_sibling); - } - } - } - smp_wmb(); - - printk(KERN_INFO "CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n", - cpuid, cpu_topology[cpuid].thread_id, - cpu_topology[cpuid].core_id, - cpu_topology[cpuid].socket_id, mpidr); -} - -/* - * init_cpu_topology is called at boot when only one cpu is running - * which prevent simultaneous write access to cpu_topology array - */ -void init_cpu_topology(void) -{ - unsigned int cpu; - - /* init core mask */ - for_each_possible_cpu(cpu) { - struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]); - - cpu_topo->thread_id = -1; - cpu_topo->core_id = -1; - cpu_topo->socket_id = -1; - cpumask_clear(&cpu_topo->core_sibling); - cpumask_clear(&cpu_topo->thread_sibling); - } - smp_wmb(); -} |