^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) * linux/arch/arm/kernel/smp.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2002 ARM Limited, All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/sched/hotplug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/cache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/profile.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/nmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/clockchips.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/cpufreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/irq_work.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/kernel_stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <asm/bugs.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) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <asm/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <asm/cputype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <asm/exception.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <asm/idmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <asm/topology.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <asm/mmu_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <asm/procinfo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <asm/smp_plat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <asm/virt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <asm/mach/arch.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <asm/mpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #define CREATE_TRACE_POINTS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <trace/events/ipi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_raise);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * as from 2.5, kernels no longer have an init_tasks structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * so we need some other way of telling a new secondary core
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * where to place its SVC stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct secondary_data secondary_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) enum ipi_msg_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) IPI_WAKEUP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) IPI_TIMER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) IPI_RESCHEDULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) IPI_CALL_FUNC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) IPI_CPU_STOP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) IPI_IRQ_WORK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) IPI_COMPLETION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) NR_IPI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * CPU_BACKTRACE is special and not included in NR_IPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * or tracable with trace_ipi_*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) IPI_CPU_BACKTRACE = NR_IPI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * SGI8-15 can be reserved by secure firmware, and thus may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * not be usable by the kernel. Please keep the above limited
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * to at most 8 entries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) MAX_IPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static int ipi_irq_base __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static int nr_ipi __read_mostly = NR_IPI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static struct irq_desc *ipi_desc[MAX_IPI] __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static void ipi_setup(int cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static DECLARE_COMPLETION(cpu_running);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static struct smp_operations smp_ops __ro_after_init;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) void __init smp_set_ops(const struct smp_operations *ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) smp_ops = *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static unsigned long get_arch_pgd(pgd_t *pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #ifdef CONFIG_ARM_LPAE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return __phys_to_pfn(virt_to_phys(pgd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return virt_to_phys(pgd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) #if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static int secondary_biglittle_prepare(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (!cpu_vtable[cpu])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) cpu_vtable[cpu] = kzalloc(sizeof(*cpu_vtable[cpu]), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return cpu_vtable[cpu] ? 0 : -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static void secondary_biglittle_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) init_proc_vtable(lookup_processor(read_cpuid_id())->proc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int secondary_biglittle_prepare(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static void secondary_biglittle_init(void)
^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) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) int __cpu_up(unsigned int cpu, struct task_struct *idle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (!smp_ops.smp_boot_secondary)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) ret = secondary_biglittle_prepare(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * We need to tell the secondary core where to find
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) * its stack and the page tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) #ifdef CONFIG_ARM_MPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) secondary_data.mpu_rgn_info = &mpu_rgn_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) #ifdef CONFIG_MMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) secondary_data.pgdir = virt_to_phys(idmap_pgd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) secondary_data.swapper_pg_dir = get_arch_pgd(swapper_pg_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) sync_cache_w(&secondary_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * Now bring the CPU into our world.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) ret = smp_ops.smp_boot_secondary(cpu, idle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (ret == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * CPU was successfully started, wait for it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * to come online or time out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) wait_for_completion_timeout(&cpu_running,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) msecs_to_jiffies(1000));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (!cpu_online(cpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) pr_crit("CPU%u: failed to come online\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) pr_err("CPU%u: failed to boot: %d\n", cpu, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) memset(&secondary_data, 0, sizeof(secondary_data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) /* platform specific SMP operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) void __init smp_init_cpus(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (smp_ops.smp_init_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) smp_ops.smp_init_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) int platform_can_secondary_boot(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return !!smp_ops.smp_boot_secondary;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) int platform_can_cpu_hotplug(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) #ifdef CONFIG_HOTPLUG_CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (smp_ops.cpu_kill)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) #ifdef CONFIG_HOTPLUG_CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static int platform_cpu_kill(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (smp_ops.cpu_kill)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return smp_ops.cpu_kill(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static int platform_cpu_disable(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (smp_ops.cpu_disable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return smp_ops.cpu_disable(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) int platform_can_hotplug_cpu(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /* cpu_die must be specified to support hotplug */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (!smp_ops.cpu_die)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (smp_ops.cpu_can_disable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return smp_ops.cpu_can_disable(cpu);
^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) * By default, allow disabling all CPUs except the first one,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * since this is special on a lot of platforms, e.g. because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * of clock tick interrupts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return cpu != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static void ipi_teardown(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (WARN_ON_ONCE(!ipi_irq_base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) for (i = 0; i < nr_ipi; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) disable_percpu_irq(ipi_irq_base + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * __cpu_disable runs on the processor to be shutdown.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) int __cpu_disable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) unsigned int cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) ret = platform_cpu_disable(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) #ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) remove_cpu_topology(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) * Take this CPU offline. Once we clear this, we can't return,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * and we must not schedule until we're ready to give up the cpu.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) set_cpu_online(cpu, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) ipi_teardown(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * OK - migrate IRQs away from this CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) irq_migrate_all_off_this_cpu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) * Flush user cache and TLB mappings, and then remove this CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * from the vm mask set of all processes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * Caches are flushed to the Level of Unification Inner Shareable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * to write-back dirty lines to unified caches shared by all CPUs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) flush_cache_louis();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) local_flush_tlb_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * called on the thread which is asking for a CPU to be shutdown -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * waits until shutdown has completed, or it is timed out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) void __cpu_die(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) if (!cpu_wait_death(cpu, 5)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) pr_err("CPU%u: cpu didn't die\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) pr_debug("CPU%u: shutdown\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) clear_tasks_mm_cpumask(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * platform_cpu_kill() is generally expected to do the powering off
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * and/or cutting of clocks to the dying CPU. Optionally, this may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * be done by the CPU which is dying in preference to supporting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * this call, but that means there is _no_ synchronisation between
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * the requesting CPU and the dying CPU actually losing power.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (!platform_cpu_kill(cpu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) pr_err("CPU%u: unable to kill\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) * Called from the idle thread for the CPU which has been shutdown.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) * Note that we disable IRQs here, but do not re-enable them
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) * before returning to the caller. This is also the behaviour
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) * of the other hotplug-cpu capable cores, so presumably coming
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * out of idle fixes this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) void arch_cpu_idle_dead(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) unsigned int cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) idle_task_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * Flush the data out of the L1 cache for this CPU. This must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * before the completion to ensure that data is safely written out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * before platform_cpu_kill() gets called - which may disable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * *this* CPU and power down its cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) flush_cache_louis();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * Tell __cpu_die() that this CPU is now safe to dispose of. Once
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * this returns, power and/or clocks can be removed at any point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * from this CPU and its cache by platform_cpu_kill().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) (void)cpu_report_death();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * Ensure that the cache lines associated with that completion are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * written out. This covers the case where _this_ CPU is doing the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * powering down, to ensure that the completion is visible to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * CPU waiting for this one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) flush_cache_louis();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * The actual CPU shutdown procedure is at least platform (if not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * CPU) specific. This may remove power, or it may simply spin.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) * Platforms are generally expected *NOT* to return from this call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * although there are some which do because they have no way to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) * power down the CPU. These platforms are the _only_ reason we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) * have a return path which uses the fragment of assembly below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * The return path should not be used for platforms which can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * power off the CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) if (smp_ops.cpu_die)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) smp_ops.cpu_die(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) pr_warn("CPU%u: smp_ops.cpu_die() returned, trying to resuscitate\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * Do not return to the idle loop - jump back to the secondary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * cpu initialisation. There's some initialisation which needs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * to be repeated to undo the effects of taking the CPU offline.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) __asm__("mov sp, %0\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) " mov fp, #0\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) " b secondary_start_kernel"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) : "r" (task_stack_page(current) + THREAD_SIZE - 8));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) #endif /* CONFIG_HOTPLUG_CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * Called by both boot and secondaries to move global data into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) * per-processor storage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) static void smp_store_cpu_info(unsigned int cpuid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) cpu_info->loops_per_jiffy = loops_per_jiffy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) cpu_info->cpuid = read_cpuid_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) store_cpu_topology(cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) check_cpu_icache_size(cpuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) * This is the secondary CPU boot entry. We're using this CPUs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) * idle thread stack, but a set of temporary page tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) asmlinkage void secondary_start_kernel(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct mm_struct *mm = &init_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) unsigned int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) secondary_biglittle_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * The identity mapping is uncached (strongly ordered), so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * switch away from it before attempting any exclusive accesses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) cpu_switch_mm(mm->pgd, mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) local_flush_bp_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) enter_lazy_tlb(mm, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) local_flush_tlb_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * All kernel threads share the same mm context; grab a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * reference and switch to it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) mmgrab(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) current->active_mm = mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) cpumask_set_cpu(cpu, mm_cpumask(mm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) cpu_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) #ifndef CONFIG_MMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) setup_vectors_base();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) pr_debug("CPU%u: Booted secondary processor\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) trace_hardirqs_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) * Give the platform a chance to do its own initialisation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) if (smp_ops.smp_secondary_init)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) smp_ops.smp_secondary_init(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) notify_cpu_starting(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) ipi_setup(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) calibrate_delay();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) smp_store_cpu_info(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * OK, now it's safe to let the boot CPU continue. Wait for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) * the CPU migration code to notice that the CPU is online
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) * before we continue - which happens after __cpu_up returns.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) set_cpu_online(cpu, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) check_other_bugs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) complete(&cpu_running);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) local_irq_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) local_fiq_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) local_abt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) * OK, it's off to the idle thread for us
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) void __init smp_cpus_done(unsigned int max_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) unsigned long bogosum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) for_each_online_cpu(cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) printk(KERN_INFO "SMP: Total of %d processors activated "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) "(%lu.%02lu BogoMIPS).\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) num_online_cpus(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) bogosum / (500000/HZ),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) (bogosum / (5000/HZ)) % 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) hyp_mode_check();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) void __init smp_prepare_boot_cpu(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) void __init smp_prepare_cpus(unsigned int max_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) unsigned int ncores = num_possible_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) init_cpu_topology();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) smp_store_cpu_info(smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) * are we trying to boot more cores than exist?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) if (max_cpus > ncores)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) max_cpus = ncores;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (ncores > 1 && max_cpus) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) * Initialise the present map, which describes the set of CPUs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * actually populated at the present time. A platform should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) * re-initialize the map in the platforms smp_prepare_cpus()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * if present != possible (e.g. physical hotplug).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) init_cpu_present(cpu_possible_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) * Initialise the SCU if there are more than one CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) * and let them know where to start.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (smp_ops.smp_prepare_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) smp_ops.smp_prepare_cpus(max_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) static const char *ipi_types[NR_IPI] __tracepoint_string = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) #define S(x,s) [x] = s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) S(IPI_WAKEUP, "CPU wakeup interrupts"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) S(IPI_TIMER, "Timer broadcast interrupts"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) S(IPI_RESCHEDULE, "Rescheduling interrupts"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) S(IPI_CALL_FUNC, "Function call interrupts"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) S(IPI_CPU_STOP, "CPU stop interrupts"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) S(IPI_IRQ_WORK, "IRQ work interrupts"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) S(IPI_COMPLETION, "completion interrupts"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) static void smp_cross_call(const struct cpumask *target, unsigned int ipinr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) void show_ipi_list(struct seq_file *p, int prec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) unsigned int cpu, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) for (i = 0; i < NR_IPI; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) if (!ipi_desc[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) irq = irq_desc_get_irq(ipi_desc[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) for_each_online_cpu(cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) seq_printf(p, " %s\n", ipi_types[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) void arch_send_call_function_ipi_mask(const struct cpumask *mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) smp_cross_call(mask, IPI_CALL_FUNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) smp_cross_call(mask, IPI_WAKEUP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) void arch_send_call_function_single_ipi(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) #ifdef CONFIG_IRQ_WORK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) void arch_irq_work_raise(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) if (arch_irq_work_has_interrupt())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) void tick_broadcast(const struct cpumask *mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) smp_cross_call(mask, IPI_TIMER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) static DEFINE_RAW_SPINLOCK(stop_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) * ipi_cpu_stop - handle IPI from smp_send_stop()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) static void ipi_cpu_stop(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) if (system_state <= SYSTEM_RUNNING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) raw_spin_lock(&stop_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) pr_crit("CPU%u: stopping\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) raw_spin_unlock(&stop_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) set_cpu_online(cpu, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) local_fiq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) cpu_relax();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) wfe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) static DEFINE_PER_CPU(struct completion *, cpu_completion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) int register_ipi_completion(struct completion *completion, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) per_cpu(cpu_completion, cpu) = completion;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) return IPI_COMPLETION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) static void ipi_complete(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) complete(per_cpu(cpu_completion, cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) * Main handler for inter-processor interrupts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) handle_IPI(ipinr, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) static void do_handle_IPI(int ipinr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) unsigned int cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) if ((unsigned)ipinr < NR_IPI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) trace_ipi_entry_rcuidle(ipi_types[ipinr]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) switch (ipinr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) case IPI_WAKEUP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) case IPI_TIMER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) tick_receive_broadcast();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) case IPI_RESCHEDULE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) scheduler_ipi();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) case IPI_CALL_FUNC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) generic_smp_call_function_interrupt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) case IPI_CPU_STOP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) ipi_cpu_stop(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) #ifdef CONFIG_IRQ_WORK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) case IPI_IRQ_WORK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) irq_work_run();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) case IPI_COMPLETION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) ipi_complete(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) case IPI_CPU_BACKTRACE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) printk_nmi_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) nmi_cpu_backtrace(get_irq_regs());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) printk_nmi_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) pr_crit("CPU%u: Unknown IPI message 0x%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) cpu, ipinr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) if ((unsigned)ipinr < NR_IPI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) trace_ipi_exit_rcuidle(ipi_types[ipinr]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) /* Legacy version, should go away once all irqchips have been converted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) void handle_IPI(int ipinr, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) struct pt_regs *old_regs = set_irq_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) irq_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) do_handle_IPI(ipinr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) irq_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) set_irq_regs(old_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) static irqreturn_t ipi_handler(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) do_handle_IPI(irq - ipi_irq_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) trace_ipi_raise_rcuidle(target, ipi_types[ipinr]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) __ipi_send_mask(ipi_desc[ipinr], target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) static void ipi_setup(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) if (WARN_ON_ONCE(!ipi_irq_base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) for (i = 0; i < nr_ipi; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) enable_percpu_irq(ipi_irq_base + i, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) void __init set_smp_ipi_range(int ipi_base, int n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) WARN_ON(n < MAX_IPI);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) nr_ipi = min(n, MAX_IPI);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) for (i = 0; i < nr_ipi; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) err = request_percpu_irq(ipi_base + i, ipi_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) "IPI", &irq_stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) WARN_ON(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) ipi_desc[i] = irq_to_desc(ipi_base + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) irq_set_status_flags(ipi_base + i, IRQ_HIDDEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) /* The recheduling IPI is special... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) if (i == IPI_RESCHEDULE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) __irq_modify_status(ipi_base + i, 0, IRQ_RAW, ~0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) ipi_irq_base = ipi_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) /* Setup the boot CPU immediately */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) ipi_setup(smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) void smp_send_reschedule(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) void smp_send_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) unsigned long timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) struct cpumask mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) cpumask_copy(&mask, cpu_online_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) cpumask_clear_cpu(smp_processor_id(), &mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) if (!cpumask_empty(&mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) smp_cross_call(&mask, IPI_CPU_STOP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) /* Wait up to one second for other CPUs to stop */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) timeout = USEC_PER_SEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) while (num_online_cpus() > 1 && timeout--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) if (num_online_cpus() > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) pr_warn("SMP: failed to stop secondary CPUs\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) /* In case panic() and panic() called at the same time on CPU1 and CPU2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) * and CPU 1 calls panic_smp_self_stop() before crash_smp_send_stop()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) * CPU1 can't receive the ipi irqs from CPU2, CPU1 will be always online,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) * kdump fails. So split out the panic_smp_self_stop() and add
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) * set_cpu_online(smp_processor_id(), false).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) void panic_smp_self_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) pr_debug("CPU %u will stop doing anything useful since another CPU has paniced\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) set_cpu_online(smp_processor_id(), false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) while (1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) cpu_relax();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) * not supported here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) int setup_profiling_timer(unsigned int multiplier)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) #ifdef CONFIG_CPU_FREQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) static DEFINE_PER_CPU(unsigned long, l_p_j_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) static DEFINE_PER_CPU(unsigned long, l_p_j_ref_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) static unsigned long global_l_p_j_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) static unsigned long global_l_p_j_ref_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) static int cpufreq_callback(struct notifier_block *nb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) unsigned long val, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) struct cpufreq_freqs *freq = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) struct cpumask *cpus = freq->policy->cpus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) int cpu, first = cpumask_first(cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) unsigned int lpj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) if (freq->flags & CPUFREQ_CONST_LOOPS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) if (!per_cpu(l_p_j_ref, first)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) for_each_cpu(cpu, cpus) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) per_cpu(l_p_j_ref, cpu) =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) per_cpu(cpu_data, cpu).loops_per_jiffy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) per_cpu(l_p_j_ref_freq, cpu) = freq->old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) if (!global_l_p_j_ref) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) global_l_p_j_ref = loops_per_jiffy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) global_l_p_j_ref_freq = freq->old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) (val == CPUFREQ_POSTCHANGE && freq->old > freq->new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) loops_per_jiffy = cpufreq_scale(global_l_p_j_ref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) global_l_p_j_ref_freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) freq->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) lpj = cpufreq_scale(per_cpu(l_p_j_ref, first),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) per_cpu(l_p_j_ref_freq, first), freq->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) for_each_cpu(cpu, cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) per_cpu(cpu_data, cpu).loops_per_jiffy = lpj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) static struct notifier_block cpufreq_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) .notifier_call = cpufreq_callback,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) static int __init register_cpufreq_notifier(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) return cpufreq_register_notifier(&cpufreq_notifier,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) CPUFREQ_TRANSITION_NOTIFIER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) core_initcall(register_cpufreq_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) static void raise_nmi(cpumask_t *mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) __ipi_send_mask(ipi_desc[IPI_CPU_BACKTRACE], mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_nmi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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