^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) * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * RajeshwarR: Dec 11, 2007
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * -- Added support for Inter Processor Interrupts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Vineetg: Nov 1st, 2007
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * -- Initial Write (Borrowed heavily from ARM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sched/mm.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/profile.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/cpumask.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/irqdomain.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/of_fdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/mach_desc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #ifndef CONFIG_ARC_HAS_LLSC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) arch_spinlock_t smp_atomic_ops_lock = __ARCH_SPIN_LOCK_UNLOCKED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) arch_spinlock_t smp_bitops_lock = __ARCH_SPIN_LOCK_UNLOCKED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) EXPORT_SYMBOL_GPL(smp_atomic_ops_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) EXPORT_SYMBOL_GPL(smp_bitops_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct plat_smp_ops __weak plat_smp_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /* XXX: per cpu ? Only needed once in early seconday boot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct task_struct *secondary_idle_tsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* Called from start_kernel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) void __init smp_prepare_boot_cpu(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static int __init arc_get_cpu_map(const char *name, struct cpumask *cpumask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned long dt_root = of_get_flat_dt_root();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) const char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) buf = of_get_flat_dt_prop(dt_root, name, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (cpulist_parse(buf, cpumask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^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) * Read from DeviceTree and setup cpu possible mask. If there is no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * "possible-cpus" property in DeviceTree pretend all [0..NR_CPUS-1] exist.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static void __init arc_init_cpu_possible(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct cpumask cpumask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (arc_get_cpu_map("possible-cpus", &cpumask)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) pr_warn("Failed to get possible-cpus from dtb, pretending all %u cpus exist\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) NR_CPUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) cpumask_setall(&cpumask);
^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) if (!cpumask_test_cpu(0, &cpumask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) panic("Master cpu (cpu[0]) is missed in cpu possible mask!");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) init_cpu_possible(&cpumask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * Called from setup_arch() before calling setup_processor()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * - Initialise the CPU possible map early - this describes the CPUs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * which may be present or become present in the system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * - Call early smp init hook. This can initialize a specific multi-core
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * IP which is say common to several platforms (hence not part of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * platform specific int_early() hook)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) void __init smp_init_cpus(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) arc_init_cpu_possible();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (plat_smp_ops.init_early_smp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) plat_smp_ops.init_early_smp();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* called from init ( ) => process 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) void __init smp_prepare_cpus(unsigned int max_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * if platform didn't set the present map already, do it now
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * boot cpu is set to present already by init/main.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (num_present_cpus() <= 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) init_cpu_present(cpu_possible_mask);
^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) void __init smp_cpus_done(unsigned int max_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * Default smp boot helper for Run-on-reset case where all cores start off
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * together. Non-masters need to wait for Master to start running.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * This is implemented using a flag in memory, which Non-masters spin-wait on.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * Master sets it to cpu-id of core to "ungate" it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static volatile int wake_flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) #ifdef CONFIG_ISA_ARCOMPACT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) #define __boot_read(f) f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) #define __boot_write(f, v) f = v
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #define __boot_read(f) arc_read_uncached_32(&f)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #define __boot_write(f, v) arc_write_uncached_32(&f, v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static void arc_default_smp_cpu_kick(int cpu, unsigned long pc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) BUG_ON(cpu == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) __boot_write(wake_flag, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) void arc_platform_smp_wait_to_boot(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /* for halt-on-reset, we've waited already */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (IS_ENABLED(CONFIG_ARC_SMP_HALT_ON_RESET))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) while (__boot_read(wake_flag) != cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) __boot_write(wake_flag, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) const char *arc_platform_smp_cpuinfo(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return plat_smp_ops.info ? : "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * The very first "C" code executed by secondary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * Called from asm stub in head.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * "current"/R25 already setup by low level boot code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) void start_kernel_secondary(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct mm_struct *mm = &init_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) unsigned int cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) /* MMU, Caches, Vector Table, Interrupts etc */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) setup_processor();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) mmget(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) mmgrab(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) current->active_mm = mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) cpumask_set_cpu(cpu, mm_cpumask(mm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* Some SMP H/w setup - for each cpu */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (plat_smp_ops.init_per_cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) plat_smp_ops.init_per_cpu(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (machine_desc->init_per_cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) machine_desc->init_per_cpu(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) notify_cpu_starting(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) set_cpu_online(cpu, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) pr_info("## CPU%u LIVE ##: Executing Code...\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) local_irq_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * Called from kernel_init( ) -> smp_init( ) - for each CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * At this point, Secondary Processor is "HALT"ed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * -It booted, but was halted in head.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) * -It was configured to halt-on-reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * So need to wake it up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * Essential requirements being where to run from (PC) and stack (SP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) int __cpu_up(unsigned int cpu, struct task_struct *idle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) unsigned long wait_till;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) secondary_idle_tsk = idle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) pr_info("Idle Task [%d] %p", cpu, idle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) pr_info("Trying to bring up CPU%u ...\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (plat_smp_ops.cpu_kick)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) plat_smp_ops.cpu_kick(cpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) (unsigned long)first_lines_of_secondary);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) arc_default_smp_cpu_kick(cpu, (unsigned long)NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /* wait for 1 sec after kicking the secondary */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) wait_till = jiffies + HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) while (time_before(jiffies, wait_till)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (cpu_online(cpu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (!cpu_online(cpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) pr_info("Timeout: CPU%u FAILED to come up !!!\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) secondary_idle_tsk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * not supported here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) int setup_profiling_timer(unsigned int multiplier)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) /*****************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /* Inter Processor Interrupt Handling */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) /*****************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) enum ipi_msg_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) IPI_EMPTY = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) IPI_RESCHEDULE = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) IPI_CALL_FUNC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) IPI_CPU_STOP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * In arches with IRQ for each msg type (above), receiver can use IRQ-id to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * figure out what msg was sent. For those which don't (ARC has dedicated IPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * IRQ), the msg-type needs to be conveyed via per-cpu data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static DEFINE_PER_CPU(unsigned long, ipi_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static void ipi_send_msg_one(int cpu, enum ipi_msg_type msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) unsigned long __percpu *ipi_data_ptr = per_cpu_ptr(&ipi_data, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) unsigned long old, new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) pr_debug("%d Sending msg [%d] to %d\n", smp_processor_id(), msg, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * Atomically write new msg bit (in case others are writing too),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * and read back old value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) new = old = READ_ONCE(*ipi_data_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) new |= 1U << msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) } while (cmpxchg(ipi_data_ptr, old, new) != old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * Call the platform specific IPI kick function, but avoid if possible:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * Only do so if there's no pending msg from other concurrent sender(s).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * Otherwise, recevier will see this msg as well when it takes the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * IPI corresponding to that msg. This is true, even if it is already in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * IPI handler, because !@old means it has not yet dequeued the msg(s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * so @new msg can be a free-loader
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (plat_smp_ops.ipi_send && !old)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) plat_smp_ops.ipi_send(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static void ipi_send_msg(const struct cpumask *callmap, enum ipi_msg_type msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) unsigned int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) for_each_cpu(cpu, callmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) ipi_send_msg_one(cpu, msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) void smp_send_reschedule(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) ipi_send_msg_one(cpu, IPI_RESCHEDULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) void smp_send_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct cpumask targets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) cpumask_copy(&targets, cpu_online_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) cpumask_clear_cpu(smp_processor_id(), &targets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) ipi_send_msg(&targets, IPI_CPU_STOP);
^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) void arch_send_call_function_single_ipi(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) ipi_send_msg_one(cpu, IPI_CALL_FUNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) void arch_send_call_function_ipi_mask(const struct cpumask *mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) ipi_send_msg(mask, IPI_CALL_FUNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) * ipi_cpu_stop - handle IPI from smp_send_stop()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) static void ipi_cpu_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) machine_halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) static inline int __do_IPI(unsigned long msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) switch (msg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) case IPI_RESCHEDULE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) scheduler_ipi();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) case IPI_CALL_FUNC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) generic_smp_call_function_interrupt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) case IPI_CPU_STOP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) ipi_cpu_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) rc = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) * arch-common ISR to handle for inter-processor interrupts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * Has hooks for platform specific IPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) irqreturn_t do_IPI(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) unsigned long pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) unsigned long __maybe_unused copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) pr_debug("IPI [%ld] received on cpu %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) *this_cpu_ptr(&ipi_data), smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (plat_smp_ops.ipi_clear)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) plat_smp_ops.ipi_clear(irq);
^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) * "dequeue" the msg corresponding to this IPI (and possibly other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * piggybacked msg from elided IPIs: see ipi_send_msg_one() above)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) copy = pending = xchg(this_cpu_ptr(&ipi_data), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) unsigned long msg = __ffs(pending);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) rc = __do_IPI(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) pr_info("IPI with bogus msg %ld in %ld\n", msg, copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) pending &= ~(1U << msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) } while (pending);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) * API called by platform code to hookup arch-common ISR to their IPI IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) * Note: If IPI is provided by platform (vs. say ARC MCIP), their intc setup/map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) * function needs to call call irq_set_percpu_devid() for IPI IRQ, otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) * request_percpu_irq() below will fail
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) static DEFINE_PER_CPU(int, ipi_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) int smp_ipi_irq_setup(int cpu, irq_hw_number_t hwirq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) int *dev = per_cpu_ptr(&ipi_dev, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) unsigned int virq = irq_find_mapping(NULL, hwirq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (!virq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) panic("Cannot find virq for root domain and hwirq=%lu", hwirq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) /* Boot cpu calls request, all call enable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) if (!cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) rc = request_percpu_irq(virq, do_IPI, "IPI Interrupt", dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) panic("Percpu IRQ request failed for %u\n", virq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) enable_percpu_irq(virq, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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