^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * arch/arm/kernel/topology.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2011 Linaro Limited.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written by: Vincent Guittot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * based on arch/sh/kernel/topology.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/arch_topology.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/cpufreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/cpumask.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/node.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/nodemask.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/sched/topology.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <asm/cputype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/topology.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * cpu capacity scale management
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * cpu capacity table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * This per cpu data structure describes the relative capacity of each core.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * On a heteregenous system, cores don't have the same computation capacity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * and we reflect that difference in the cpu_capacity field so the scheduler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * can take this difference into account during load balance. A per cpu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * structure is preferred because each CPU updates its own cpu_capacity field
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * during the load balance except for idle cores. One idle core is selected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * to run the rebalance_domains for all idle cores and the cpu_capacity can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * updated during this sequence.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct cpu_efficiency {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) const char *compatible;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned long efficiency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * Table of relative efficiency of each processors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * The efficiency value must fit in 20bit and the final
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * cpu_scale value must be in the range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * 0 < cpu_scale < 3*SCHED_CAPACITY_SCALE/2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * in order to return at most 1 when DIV_ROUND_CLOSEST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * is used to compute the capacity of a CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * Processors that are not defined in the table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * use the default SCHED_CAPACITY_SCALE value for cpu_scale.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static const struct cpu_efficiency table_efficiency[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {"arm,cortex-a15", 3891},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {"arm,cortex-a7", 2048},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {NULL, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static unsigned long *__cpu_capacity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #define cpu_capacity(cpu) __cpu_capacity[cpu]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static unsigned long middle_capacity = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static bool cap_from_dt = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * Iterate all CPUs' descriptor in DT and compute the efficiency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * (as per table_efficiency). Also calculate a middle efficiency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * as close as possible to (max{eff_i} - min{eff_i}) / 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * This is later used to scale the cpu_capacity field such that an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * 'average' CPU is of middle capacity. Also see the comments near
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * table_efficiency[] and update_cpu_capacity().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static void __init parse_dt_topology(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) const struct cpu_efficiency *cpu_eff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct device_node *cn = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) unsigned long min_capacity = ULONG_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) unsigned long max_capacity = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) unsigned long capacity = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int cpu = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) __cpu_capacity = kcalloc(nr_cpu_ids, sizeof(*__cpu_capacity),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) const __be32 *rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* too early to use cpu->of_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) cn = of_get_cpu_node(cpu, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (!cn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) pr_err("missing device node for CPU %d\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (topology_parse_cpu_capacity(cn, cpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) of_node_put(cn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) cap_from_dt = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) for (cpu_eff = table_efficiency; cpu_eff->compatible; cpu_eff++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (of_device_is_compatible(cn, cpu_eff->compatible))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (cpu_eff->compatible == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) rate = of_get_property(cn, "clock-frequency", &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (!rate || len != 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) pr_err("%pOF missing clock-frequency property\n", cn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) capacity = ((be32_to_cpup(rate)) >> 20) * cpu_eff->efficiency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /* Save min capacity of the system */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (capacity < min_capacity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) min_capacity = capacity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /* Save max capacity of the system */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (capacity > max_capacity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) max_capacity = capacity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) cpu_capacity(cpu) = capacity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* If min and max capacities are equals, we bypass the update of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * cpu_scale because all CPUs have the same capacity. Otherwise, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * compute a middle_capacity factor that will ensure that the capacity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * of an 'average' CPU of the system will be as close as possible to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * SCHED_CAPACITY_SCALE, which is the default value, but with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * constraint explained near table_efficiency[].
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (4*max_capacity < (3*(max_capacity + min_capacity)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) middle_capacity = (min_capacity + max_capacity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) >> (SCHED_CAPACITY_SHIFT+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) middle_capacity = ((max_capacity / 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) >> (SCHED_CAPACITY_SHIFT-1)) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (cap_from_dt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) topology_normalize_cpu_scale();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * Look for a customed capacity of a CPU in the cpu_capacity table during the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * boot. The update of all CPUs is in O(n^2) for heteregeneous system but the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * function returns directly for SMP system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static void update_cpu_capacity(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (!cpu_capacity(cpu) || cap_from_dt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) topology_set_cpu_scale(cpu, cpu_capacity(cpu) / middle_capacity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) pr_info("CPU%u: update cpu_capacity %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) cpu, topology_get_cpu_scale(cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static inline void parse_dt_topology(void) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static inline void update_cpu_capacity(unsigned int cpuid) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * store_cpu_topology is called at boot when only one cpu is running
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * and with the mutex cpu_hotplug.lock locked, when several cpus have booted,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * which prevents simultaneous write access to cpu_topology array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) void store_cpu_topology(unsigned int cpuid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) unsigned int mpidr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (cpuid_topo->package_id != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) goto topology_populated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) mpidr = read_cpuid_mpidr();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /* create cpu topology mapping */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if ((mpidr & MPIDR_SMP_BITMASK) == MPIDR_SMP_VALUE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * This is a multiprocessor system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * multiprocessor format & multiprocessor mode field are set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (mpidr & MPIDR_MT_BITMASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /* core performance interdependency */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) cpuid_topo->thread_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) /* largely independent cores */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) cpuid_topo->thread_id = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * This is an uniprocessor system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * we are in multiprocessor format but uniprocessor system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * or in the old uniprocessor format
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) cpuid_topo->thread_id = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) cpuid_topo->core_id = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) cpuid_topo->package_id = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) update_cpu_capacity(cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) pr_info("CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) cpuid, cpu_topology[cpuid].thread_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) cpu_topology[cpuid].core_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) cpu_topology[cpuid].package_id, mpidr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) topology_populated:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) update_siblings_masks(cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * init_cpu_topology is called at boot when only one cpu is running
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * which prevent simultaneous write access to cpu_topology array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) void __init init_cpu_topology(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) reset_cpu_topology();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) smp_wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) parse_dt_topology();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags