^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * SMP initialisation and IPI support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Based on arch/arm64/kernel/smp.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2012 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2015 Regents of the University of California
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2017 SiFive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/arch_topology.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kernel_stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/cpu.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/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/cpu_ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/mmu_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <asm/sbi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include "head.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static DECLARE_COMPLETION(cpu_running);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) void __init smp_prepare_boot_cpu(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) init_cpu_topology();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) void __init smp_prepare_cpus(unsigned int max_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int cpuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* This covers non-smp usecase mandated by "nosmp" option */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (max_cpus == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) for_each_possible_cpu(cpuid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (cpuid == smp_processor_id())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (cpu_ops[cpuid]->cpu_prepare) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ret = cpu_ops[cpuid]->cpu_prepare(cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) set_cpu_present(cpuid, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) void __init setup_smp(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct device_node *dn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int hart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) bool found_boot_cpu = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int cpuid = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) cpu_set_ops(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) for_each_of_cpu_node(dn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) hart = riscv_of_processor_hartid(dn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (hart < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (hart == cpuid_to_hartid_map(0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) BUG_ON(found_boot_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) found_boot_cpu = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (cpuid >= NR_CPUS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) pr_warn("Invalid cpuid [%d] for hartid [%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) cpuid, hart);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) cpuid_to_hartid_map(cpuid) = hart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) cpuid++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) BUG_ON(!found_boot_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (cpuid > nr_cpu_ids)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) pr_warn("Total number of cpus [%d] is greater than nr_cpus option value [%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) cpuid, nr_cpu_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) for (cpuid = 1; cpuid < nr_cpu_ids; cpuid++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (cpuid_to_hartid_map(cpuid) != INVALID_HARTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) cpu_set_ops(cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) set_cpu_possible(cpuid, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^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) static int start_secondary_cpu(int cpu, struct task_struct *tidle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (cpu_ops[cpu]->cpu_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return cpu_ops[cpu]->cpu_start(cpu, tidle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int __cpu_up(unsigned int cpu, struct task_struct *tidle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) tidle->thread_info.cpu = cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) ret = start_secondary_cpu(cpu, tidle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) wait_for_completion_timeout(&cpu_running,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) msecs_to_jiffies(1000));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (!cpu_online(cpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) pr_crit("CPU%u: failed to come online\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) pr_crit("CPU%u: failed to start\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) void __init smp_cpus_done(unsigned int max_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * C entry point for a secondary processor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) asmlinkage __visible void smp_callin(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct mm_struct *mm = &init_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) unsigned int curr_cpuid = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) riscv_clear_ipi();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* All kernel threads share the same mm context. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) mmgrab(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) current->active_mm = mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) notify_cpu_starting(curr_cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) update_siblings_masks(curr_cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) set_cpu_online(curr_cpuid, 1);
^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) * Remote TLB flushes are ignored while the CPU is offline, so emit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * a local TLB flush right now just in case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) local_flush_tlb_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) complete(&cpu_running);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * Disable preemption before enabling interrupts, so we don't try to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * schedule a CPU that hasn't actually started yet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) local_irq_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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