Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/kernel/smp.c |
| 3 | * |
| 4 | * Copyright (C) 2002 ARM Limited, All Rights Reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
Russell King | c97d486 | 2006-10-25 13:59:16 +0100 | [diff] [blame] | 10 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/delay.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/spinlock.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/cache.h> |
| 17 | #include <linux/profile.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 20 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/cpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/seq_file.h> |
Russell King | c97d486 | 2006-10-25 13:59:16 +0100 | [diff] [blame] | 23 | #include <linux/irq.h> |
Russell King | 96f0e00 | 2014-09-03 23:57:13 +0100 | [diff] [blame] | 24 | #include <linux/nmi.h> |
Russell King | bc28248 | 2009-05-17 18:58:34 +0100 | [diff] [blame] | 25 | #include <linux/percpu.h> |
| 26 | #include <linux/clockchips.h> |
Russell King | 3c030be | 2010-11-30 11:07:35 +0000 | [diff] [blame] | 27 | #include <linux/completion.h> |
Richard Zhao | ec971ea | 2012-09-05 01:08:59 +0200 | [diff] [blame] | 28 | #include <linux/cpufreq.h> |
Stephen Boyd | bf18525 | 2013-10-29 20:32:56 +0100 | [diff] [blame] | 29 | #include <linux/irq_work.h> |
Russell King | ab6c397 | 2019-02-14 09:49:28 -0500 | [diff] [blame] | 30 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 32 | #include <linux/atomic.h> |
Russell King | 35293cc | 2018-11-07 11:43:41 -0500 | [diff] [blame] | 33 | #include <asm/bugs.h> |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 34 | #include <asm/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/cacheflush.h> |
| 36 | #include <asm/cpu.h> |
Russell King | 42578c8 | 2009-06-11 15:35:00 +0100 | [diff] [blame] | 37 | #include <asm/cputype.h> |
Jamie Iles | 5a567d7 | 2011-10-08 11:20:42 +0100 | [diff] [blame] | 38 | #include <asm/exception.h> |
Will Deacon | 8903826 | 2011-09-30 11:43:29 +0100 | [diff] [blame] | 39 | #include <asm/idmap.h> |
Vincent Guittot | c9018aa | 2011-08-08 13:21:59 +0100 | [diff] [blame] | 40 | #include <asm/topology.h> |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 41 | #include <asm/mmu_context.h> |
| 42 | #include <asm/pgtable.h> |
| 43 | #include <asm/pgalloc.h> |
Russell King | ab6c397 | 2019-02-14 09:49:28 -0500 | [diff] [blame] | 44 | #include <asm/procinfo.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/processor.h> |
Russell King | 37b05b63 | 2010-10-01 15:38:24 +0100 | [diff] [blame] | 46 | #include <asm/sections.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <asm/tlbflush.h> |
| 48 | #include <asm/ptrace.h> |
Will Deacon | d625728 | 2011-08-23 22:19:29 +0100 | [diff] [blame] | 49 | #include <asm/smp_plat.h> |
Dave Martin | 4588c34 | 2012-02-17 16:54:28 +0000 | [diff] [blame] | 50 | #include <asm/virt.h> |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 51 | #include <asm/mach/arch.h> |
Jonathan Austin | eb08375 | 2013-02-22 18:51:30 +0000 | [diff] [blame] | 52 | #include <asm/mpu.h> |
Teng Fei Fan | ae3d0ee | 2018-06-05 10:50:32 +0800 | [diff] [blame] | 53 | #include <asm/cputype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 55 | #define CREATE_TRACE_POINTS |
| 56 | #include <trace/events/ipi.h> |
| 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | /* |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 59 | * as from 2.5, kernels no longer have an init_tasks structure |
| 60 | * so we need some other way of telling a new secondary core |
| 61 | * where to place its SVC stack |
| 62 | */ |
| 63 | struct secondary_data secondary_data; |
| 64 | |
Marc Zyngier | 28e8e29 | 2012-06-12 11:16:27 +0100 | [diff] [blame] | 65 | /* |
| 66 | * control for which core is the next to come out of the secondary |
| 67 | * boot "holding pen" |
| 68 | */ |
Paul Gortmaker | 8bd26e3 | 2013-06-17 15:43:14 -0400 | [diff] [blame] | 69 | volatile int pen_release = -1; |
Marc Zyngier | 28e8e29 | 2012-06-12 11:16:27 +0100 | [diff] [blame] | 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | enum ipi_msg_type { |
Stephen Boyd | 559a593 | 2012-09-19 08:16:07 +0100 | [diff] [blame] | 72 | IPI_WAKEUP, |
| 73 | IPI_TIMER, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | IPI_RESCHEDULE, |
| 75 | IPI_CALL_FUNC, |
| 76 | IPI_CPU_STOP, |
Stephen Boyd | bf18525 | 2013-10-29 20:32:56 +0100 | [diff] [blame] | 77 | IPI_IRQ_WORK, |
Nicolas Pitre | 5135d87 | 2012-11-27 21:54:41 -0500 | [diff] [blame] | 78 | IPI_COMPLETION, |
Arnd Bergmann | 98e17ed | 2019-05-14 15:41:48 -0700 | [diff] [blame] | 79 | /* |
| 80 | * CPU_BACKTRACE is special and not included in NR_IPI |
| 81 | * or tracable with trace_ipi_* |
| 82 | */ |
Marc Zyngier | e7273ff | 2015-12-18 11:06:47 +0100 | [diff] [blame] | 83 | IPI_CPU_BACKTRACE, |
| 84 | /* |
| 85 | * SGI8-15 can be reserved by secure firmware, and thus may |
| 86 | * not be usable by the kernel. Please keep the above limited |
| 87 | * to at most 8 entries. |
| 88 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | }; |
| 90 | |
Russell King | 149c241 | 2012-01-18 15:59:45 +0000 | [diff] [blame] | 91 | static DECLARE_COMPLETION(cpu_running); |
| 92 | |
Kees Cook | 7619751 | 2016-08-10 22:46:49 +0100 | [diff] [blame] | 93 | static struct smp_operations smp_ops __ro_after_init; |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 94 | |
Masahiro Yamada | 4caa9dd | 2015-08-26 07:49:11 +0100 | [diff] [blame] | 95 | void __init smp_set_ops(const struct smp_operations *ops) |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 96 | { |
| 97 | if (ops) |
| 98 | smp_ops = *ops; |
| 99 | }; |
| 100 | |
Cyril Chemparathy | 4756dcb | 2012-07-21 15:55:04 -0400 | [diff] [blame] | 101 | static unsigned long get_arch_pgd(pgd_t *pgd) |
| 102 | { |
Russell King | b2c3e38 | 2015-04-04 20:09:46 +0100 | [diff] [blame] | 103 | #ifdef CONFIG_ARM_LPAE |
| 104 | return __phys_to_pfn(virt_to_phys(pgd)); |
| 105 | #else |
| 106 | return virt_to_phys(pgd); |
| 107 | #endif |
Cyril Chemparathy | 4756dcb | 2012-07-21 15:55:04 -0400 | [diff] [blame] | 108 | } |
| 109 | |
Russell King | ab6c397 | 2019-02-14 09:49:28 -0500 | [diff] [blame] | 110 | #if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR) |
| 111 | static int secondary_biglittle_prepare(unsigned int cpu) |
| 112 | { |
| 113 | if (!cpu_vtable[cpu]) |
| 114 | cpu_vtable[cpu] = kzalloc(sizeof(*cpu_vtable[cpu]), GFP_KERNEL); |
| 115 | |
| 116 | return cpu_vtable[cpu] ? 0 : -ENOMEM; |
| 117 | } |
| 118 | |
| 119 | static void secondary_biglittle_init(void) |
| 120 | { |
| 121 | init_proc_vtable(lookup_processor(read_cpuid_id())->proc); |
| 122 | } |
| 123 | #else |
| 124 | static int secondary_biglittle_prepare(unsigned int cpu) |
| 125 | { |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | static void secondary_biglittle_init(void) |
| 130 | { |
| 131 | } |
| 132 | #endif |
| 133 | |
Paul Gortmaker | 8bd26e3 | 2013-06-17 15:43:14 -0400 | [diff] [blame] | 134 | int __cpu_up(unsigned int cpu, struct task_struct *idle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | int ret; |
| 137 | |
Geert Uytterhoeven | 084bb5b | 2014-08-20 20:49:54 +0100 | [diff] [blame] | 138 | if (!smp_ops.smp_boot_secondary) |
| 139 | return -ENOSYS; |
| 140 | |
Russell King | ab6c397 | 2019-02-14 09:49:28 -0500 | [diff] [blame] | 141 | ret = secondary_biglittle_prepare(cpu); |
| 142 | if (ret) |
| 143 | return ret; |
| 144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | /* |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 146 | * We need to tell the secondary core where to find |
| 147 | * its stack and the page tables. |
| 148 | */ |
Al Viro | 32d39a9 | 2006-01-12 01:05:58 -0800 | [diff] [blame] | 149 | secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; |
Jonathan Austin | eb08375 | 2013-02-22 18:51:30 +0000 | [diff] [blame] | 150 | #ifdef CONFIG_ARM_MPU |
| 151 | secondary_data.mpu_rgn_szr = mpu_rgn_info.rgns[MPU_RAM_REGION].drsr; |
| 152 | #endif |
| 153 | |
Will Deacon | c4a1f03 | 2012-02-28 13:02:59 +0000 | [diff] [blame] | 154 | #ifdef CONFIG_MMU |
Russell King | b2c3e38 | 2015-04-04 20:09:46 +0100 | [diff] [blame] | 155 | secondary_data.pgdir = virt_to_phys(idmap_pgd); |
Cyril Chemparathy | 4756dcb | 2012-07-21 15:55:04 -0400 | [diff] [blame] | 156 | secondary_data.swapper_pg_dir = get_arch_pgd(swapper_pg_dir); |
Will Deacon | c4a1f03 | 2012-02-28 13:02:59 +0000 | [diff] [blame] | 157 | #endif |
Nicolas Pitre | efcfc46 | 2013-12-09 16:10:18 +0100 | [diff] [blame] | 158 | sync_cache_w(&secondary_data); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 159 | |
| 160 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | * Now bring the CPU into our world. |
| 162 | */ |
Geert Uytterhoeven | 084bb5b | 2014-08-20 20:49:54 +0100 | [diff] [blame] | 163 | ret = smp_ops.smp_boot_secondary(cpu, idle); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 164 | if (ret == 0) { |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 165 | /* |
| 166 | * CPU was successfully started, wait for it |
| 167 | * to come online or time out. |
| 168 | */ |
Russell King | 149c241 | 2012-01-18 15:59:45 +0000 | [diff] [blame] | 169 | wait_for_completion_timeout(&cpu_running, |
| 170 | msecs_to_jiffies(1000)); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 171 | |
Russell King | 58613cd | 2010-12-18 12:34:39 +0000 | [diff] [blame] | 172 | if (!cpu_online(cpu)) { |
| 173 | pr_crit("CPU%u: failed to come online\n", cpu); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 174 | ret = -EIO; |
Russell King | 58613cd | 2010-12-18 12:34:39 +0000 | [diff] [blame] | 175 | } |
| 176 | } else { |
| 177 | pr_err("CPU%u: failed to boot: %d\n", cpu, ret); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 178 | } |
| 179 | |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 180 | |
Jonathan Austin | eb08375 | 2013-02-22 18:51:30 +0000 | [diff] [blame] | 181 | memset(&secondary_data, 0, sizeof(secondary_data)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | return ret; |
| 183 | } |
| 184 | |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 185 | /* platform specific SMP operations */ |
Marc Zyngier | ac6c799 | 2011-09-27 14:48:23 +0100 | [diff] [blame] | 186 | void __init smp_init_cpus(void) |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 187 | { |
| 188 | if (smp_ops.smp_init_cpus) |
| 189 | smp_ops.smp_init_cpus(); |
| 190 | } |
| 191 | |
Geert Uytterhoeven | fee3fd4 | 2015-04-01 13:36:57 +0100 | [diff] [blame] | 192 | int platform_can_secondary_boot(void) |
| 193 | { |
| 194 | return !!smp_ops.smp_boot_secondary; |
| 195 | } |
| 196 | |
Stephen Warren | 2103f6c | 2013-08-02 20:52:49 +0100 | [diff] [blame] | 197 | int platform_can_cpu_hotplug(void) |
| 198 | { |
| 199 | #ifdef CONFIG_HOTPLUG_CPU |
| 200 | if (smp_ops.cpu_kill) |
| 201 | return 1; |
| 202 | #endif |
| 203 | |
| 204 | return 0; |
| 205 | } |
| 206 | |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 207 | #ifdef CONFIG_HOTPLUG_CPU |
Marc Zyngier | ac6c799 | 2011-09-27 14:48:23 +0100 | [diff] [blame] | 208 | static int platform_cpu_kill(unsigned int cpu) |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 209 | { |
| 210 | if (smp_ops.cpu_kill) |
| 211 | return smp_ops.cpu_kill(cpu); |
| 212 | return 1; |
| 213 | } |
| 214 | |
Marc Zyngier | ac6c799 | 2011-09-27 14:48:23 +0100 | [diff] [blame] | 215 | static int platform_cpu_disable(unsigned int cpu) |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 216 | { |
| 217 | if (smp_ops.cpu_disable) |
| 218 | return smp_ops.cpu_disable(cpu); |
| 219 | |
Stephen Boyd | 787047e | 2015-07-29 00:34:48 +0100 | [diff] [blame] | 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | int platform_can_hotplug_cpu(unsigned int cpu) |
| 224 | { |
| 225 | /* cpu_die must be specified to support hotplug */ |
| 226 | if (!smp_ops.cpu_die) |
| 227 | return 0; |
| 228 | |
| 229 | if (smp_ops.cpu_can_disable) |
| 230 | return smp_ops.cpu_can_disable(cpu); |
| 231 | |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 232 | /* |
| 233 | * By default, allow disabling all CPUs except the first one, |
| 234 | * since this is special on a lot of platforms, e.g. because |
| 235 | * of clock tick interrupts. |
| 236 | */ |
Stephen Boyd | 787047e | 2015-07-29 00:34:48 +0100 | [diff] [blame] | 237 | return cpu != 0; |
Marc Zyngier | abcee5f | 2011-09-08 09:06:10 +0100 | [diff] [blame] | 238 | } |
Stephen Boyd | 787047e | 2015-07-29 00:34:48 +0100 | [diff] [blame] | 239 | |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 240 | /* |
| 241 | * __cpu_disable runs on the processor to be shutdown. |
| 242 | */ |
Paul Gortmaker | 8bd26e3 | 2013-06-17 15:43:14 -0400 | [diff] [blame] | 243 | int __cpu_disable(void) |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 244 | { |
| 245 | unsigned int cpu = smp_processor_id(); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 246 | int ret; |
| 247 | |
Russell King | 8e2a43f | 2010-05-15 10:18:05 +0100 | [diff] [blame] | 248 | ret = platform_cpu_disable(cpu); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 249 | if (ret) |
| 250 | return ret; |
| 251 | |
| 252 | /* |
| 253 | * Take this CPU offline. Once we clear this, we can't return, |
| 254 | * and we must not schedule until we're ready to give up the cpu. |
| 255 | */ |
Russell King | e03cdad | 2009-05-28 14:16:52 +0100 | [diff] [blame] | 256 | set_cpu_online(cpu, false); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 257 | |
| 258 | /* |
| 259 | * OK - migrate IRQs away from this CPU |
| 260 | */ |
Dietmar Eggemann | 6256557 | 2019-01-21 14:42:42 +0100 | [diff] [blame] | 261 | irq_migrate_all_off_this_cpu(); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 262 | |
| 263 | /* |
| 264 | * Flush user cache and TLB mappings, and then remove this CPU |
| 265 | * from the vm mask set of all processes. |
Lorenzo Pieralisi | e6b866e | 2012-09-07 11:09:15 +0530 | [diff] [blame] | 266 | * |
| 267 | * Caches are flushed to the Level of Unification Inner Shareable |
| 268 | * to write-back dirty lines to unified caches shared by all CPUs. |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 269 | */ |
Lorenzo Pieralisi | e6b866e | 2012-09-07 11:09:15 +0530 | [diff] [blame] | 270 | flush_cache_louis(); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 271 | local_flush_tlb_all(); |
| 272 | |
Anton Vorontsov | 3eaa73b | 2012-05-31 16:26:22 -0700 | [diff] [blame] | 273 | clear_tasks_mm_cpumask(cpu); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * called on the thread which is asking for a CPU to be shutdown - |
| 280 | * waits until shutdown has completed, or it is timed out. |
| 281 | */ |
Paul Gortmaker | 8bd26e3 | 2013-06-17 15:43:14 -0400 | [diff] [blame] | 282 | void __cpu_die(unsigned int cpu) |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 283 | { |
Maria Yu | cf9c285 | 2018-06-29 13:22:46 +0800 | [diff] [blame] | 284 | if (!cpu_wait_death(cpu, 5)) { |
Russell King | 3c030be | 2010-11-30 11:07:35 +0000 | [diff] [blame] | 285 | pr_err("CPU%u: cpu didn't die\n", cpu); |
| 286 | return; |
| 287 | } |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 288 | pr_notice("CPU%u: shutdown\n", cpu); |
Russell King | 3c030be | 2010-11-30 11:07:35 +0000 | [diff] [blame] | 289 | |
Russell King | 51acdfd | 2013-04-18 18:05:29 +0100 | [diff] [blame] | 290 | /* |
| 291 | * platform_cpu_kill() is generally expected to do the powering off |
| 292 | * and/or cutting of clocks to the dying CPU. Optionally, this may |
| 293 | * be done by the CPU which is dying in preference to supporting |
| 294 | * this call, but that means there is _no_ synchronisation between |
| 295 | * the requesting CPU and the dying CPU actually losing power. |
| 296 | */ |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 297 | if (!platform_cpu_kill(cpu)) |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 298 | pr_err("CPU%u: unable to kill\n", cpu); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Called from the idle thread for the CPU which has been shutdown. |
| 303 | * |
| 304 | * Note that we disable IRQs here, but do not re-enable them |
| 305 | * before returning to the caller. This is also the behaviour |
| 306 | * of the other hotplug-cpu capable cores, so presumably coming |
| 307 | * out of idle fixes this. |
| 308 | */ |
Stephen Boyd | 9205b79 | 2015-08-24 21:49:30 +0100 | [diff] [blame] | 309 | void arch_cpu_idle_dead(void) |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 310 | { |
| 311 | unsigned int cpu = smp_processor_id(); |
| 312 | |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 313 | idle_task_exit(); |
| 314 | |
Russell King | f36d340 | 2010-11-30 12:21:30 +0000 | [diff] [blame] | 315 | local_irq_disable(); |
Russell King | f36d340 | 2010-11-30 12:21:30 +0000 | [diff] [blame] | 316 | |
Russell King | 51acdfd | 2013-04-18 18:05:29 +0100 | [diff] [blame] | 317 | /* |
| 318 | * Flush the data out of the L1 cache for this CPU. This must be |
| 319 | * before the completion to ensure that data is safely written out |
| 320 | * before platform_cpu_kill() gets called - which may disable |
| 321 | * *this* CPU and power down its cache. |
| 322 | */ |
| 323 | flush_cache_louis(); |
| 324 | |
| 325 | /* |
| 326 | * Tell __cpu_die() that this CPU is now safe to dispose of. Once |
| 327 | * this returns, power and/or clocks can be removed at any point |
| 328 | * from this CPU and its cache by platform_cpu_kill(). |
| 329 | */ |
Maria Yu | cf9c285 | 2018-06-29 13:22:46 +0800 | [diff] [blame] | 330 | (void)cpu_report_death(); |
Russell King | 3c030be | 2010-11-30 11:07:35 +0000 | [diff] [blame] | 331 | |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 332 | /* |
Russell King | 51acdfd | 2013-04-18 18:05:29 +0100 | [diff] [blame] | 333 | * Ensure that the cache lines associated with that completion are |
| 334 | * written out. This covers the case where _this_ CPU is doing the |
| 335 | * powering down, to ensure that the completion is visible to the |
| 336 | * CPU waiting for this one. |
| 337 | */ |
| 338 | flush_cache_louis(); |
| 339 | |
| 340 | /* |
| 341 | * The actual CPU shutdown procedure is at least platform (if not |
| 342 | * CPU) specific. This may remove power, or it may simply spin. |
| 343 | * |
| 344 | * Platforms are generally expected *NOT* to return from this call, |
| 345 | * although there are some which do because they have no way to |
| 346 | * power down the CPU. These platforms are the _only_ reason we |
| 347 | * have a return path which uses the fragment of assembly below. |
| 348 | * |
| 349 | * The return path should not be used for platforms which can |
| 350 | * power off the CPU. |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 351 | */ |
Russell King | 0a30111 | 2013-01-14 15:54:28 +0000 | [diff] [blame] | 352 | if (smp_ops.cpu_die) |
| 353 | smp_ops.cpu_die(cpu); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 354 | |
Russell King | 668bc38 | 2014-01-11 11:25:37 +0000 | [diff] [blame] | 355 | pr_warn("CPU%u: smp_ops.cpu_die() returned, trying to resuscitate\n", |
| 356 | cpu); |
| 357 | |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 358 | /* |
| 359 | * Do not return to the idle loop - jump back to the secondary |
| 360 | * cpu initialisation. There's some initialisation which needs |
| 361 | * to be repeated to undo the effects of taking the CPU offline. |
| 362 | */ |
| 363 | __asm__("mov sp, %0\n" |
Russell King | faabfa0 | 2010-12-20 16:58:19 +0000 | [diff] [blame] | 364 | " mov fp, #0\n" |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 365 | " b secondary_start_kernel" |
| 366 | : |
Al Viro | 32d39a9 | 2006-01-12 01:05:58 -0800 | [diff] [blame] | 367 | : "r" (task_stack_page(current) + THREAD_SIZE - 8)); |
Russell King | a054a81 | 2005-11-02 22:24:33 +0000 | [diff] [blame] | 368 | } |
| 369 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | /* |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 372 | * Called by both boot and secondaries to move global data into |
| 373 | * per-processor storage. |
| 374 | */ |
Paul Gortmaker | 8bd26e3 | 2013-06-17 15:43:14 -0400 | [diff] [blame] | 375 | static void smp_store_cpu_info(unsigned int cpuid) |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 376 | { |
| 377 | struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); |
| 378 | |
| 379 | cpu_info->loops_per_jiffy = loops_per_jiffy; |
Lorenzo Pieralisi | e8d432c | 2012-11-06 11:57:43 +0000 | [diff] [blame] | 380 | cpu_info->cpuid = read_cpuid_id(); |
Vincent Guittot | c9018aa | 2011-08-08 13:21:59 +0100 | [diff] [blame] | 381 | |
| 382 | store_cpu_topology(cpuid); |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | /* |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 386 | * This is the secondary CPU boot entry. We're using this CPUs |
| 387 | * idle thread stack, but a set of temporary page tables. |
| 388 | */ |
Paul Gortmaker | 8bd26e3 | 2013-06-17 15:43:14 -0400 | [diff] [blame] | 389 | asmlinkage void secondary_start_kernel(void) |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 390 | { |
| 391 | struct mm_struct *mm = &init_mm; |
Will Deacon | 5f40b90 | 2012-10-19 17:53:01 +0100 | [diff] [blame] | 392 | unsigned int cpu; |
| 393 | |
Russell King | ab6c397 | 2019-02-14 09:49:28 -0500 | [diff] [blame] | 394 | secondary_biglittle_init(); |
| 395 | |
Will Deacon | 5f40b90 | 2012-10-19 17:53:01 +0100 | [diff] [blame] | 396 | /* |
| 397 | * The identity mapping is uncached (strongly ordered), so |
| 398 | * switch away from it before attempting any exclusive accesses. |
| 399 | */ |
Teng Fei Fan | ae3d0ee | 2018-06-05 10:50:32 +0800 | [diff] [blame] | 400 | arm_init_bp_hardening(); |
Will Deacon | 5f40b90 | 2012-10-19 17:53:01 +0100 | [diff] [blame] | 401 | cpu_switch_mm(mm->pgd, mm); |
Will Deacon | 89c7e4b | 2013-02-28 17:48:40 +0100 | [diff] [blame] | 402 | local_flush_bp_all(); |
Will Deacon | 5f40b90 | 2012-10-19 17:53:01 +0100 | [diff] [blame] | 403 | enter_lazy_tlb(mm, current); |
| 404 | local_flush_tlb_all(); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 405 | |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 406 | /* |
| 407 | * All kernel threads share the same mm context; grab a |
| 408 | * reference and switch to it. |
| 409 | */ |
Will Deacon | 5f40b90 | 2012-10-19 17:53:01 +0100 | [diff] [blame] | 410 | cpu = smp_processor_id(); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 411 | atomic_inc(&mm->mm_count); |
| 412 | current->active_mm = mm; |
Rusty Russell | 56f8ba8 | 2009-09-24 09:34:49 -0600 | [diff] [blame] | 413 | cpumask_set_cpu(cpu, mm_cpumask(mm)); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 414 | |
Rob Herring | 14318efb | 2012-11-29 20:39:54 +0100 | [diff] [blame] | 415 | cpu_init(); |
| 416 | |
Russell King | c68b027 | 2014-10-28 12:08:34 +0000 | [diff] [blame] | 417 | pr_debug("CPU%u: Booted secondary processor\n", cpu); |
Colin Cross | fde165b | 2012-05-05 20:58:13 +0100 | [diff] [blame] | 418 | |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 419 | preempt_disable(); |
Russell King | 2c0136d | 2010-12-03 15:00:49 +0000 | [diff] [blame] | 420 | trace_hardirqs_off(); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 421 | |
| 422 | /* |
| 423 | * Give the platform a chance to do its own initialisation. |
| 424 | */ |
Russell King | 0a30111 | 2013-01-14 15:54:28 +0000 | [diff] [blame] | 425 | if (smp_ops.smp_secondary_init) |
| 426 | smp_ops.smp_secondary_init(cpu); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 427 | |
Rohit Vaswani | 7c04ad8 | 2014-08-07 17:38:41 -0700 | [diff] [blame] | 428 | smp_store_cpu_info(cpu); |
| 429 | |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 430 | notify_cpu_starting(cpu); |
Catalin Marinas | a8655e8 | 2008-02-04 17:30:57 +0100 | [diff] [blame] | 431 | |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 432 | calibrate_delay(); |
| 433 | |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 434 | /* |
Russell King | 573619d | 2011-06-20 16:46:01 +0100 | [diff] [blame] | 435 | * OK, now it's safe to let the boot CPU continue. Wait for |
| 436 | * the CPU migration code to notice that the CPU is online |
Russell King | 149c241 | 2012-01-18 15:59:45 +0000 | [diff] [blame] | 437 | * before we continue - which happens after __cpu_up returns. |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 438 | */ |
Russell King | e03cdad | 2009-05-28 14:16:52 +0100 | [diff] [blame] | 439 | set_cpu_online(cpu, true); |
Russell King | 35293cc | 2018-11-07 11:43:41 -0500 | [diff] [blame] | 440 | |
| 441 | check_other_bugs(); |
| 442 | |
Russell King | 149c241 | 2012-01-18 15:59:45 +0000 | [diff] [blame] | 443 | complete(&cpu_running); |
Thomas Gleinxer | eb04745 | 2011-10-14 12:44:41 +0100 | [diff] [blame] | 444 | |
Thomas Gleinxer | eb04745 | 2011-10-14 12:44:41 +0100 | [diff] [blame] | 445 | local_irq_enable(); |
| 446 | local_fiq_enable(); |
Lucas Stach | bbeb920 | 2015-08-25 13:52:09 +0100 | [diff] [blame] | 447 | local_abt_enable(); |
Thomas Gleinxer | eb04745 | 2011-10-14 12:44:41 +0100 | [diff] [blame] | 448 | |
| 449 | /* |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 450 | * OK, it's off to the idle thread for us |
| 451 | */ |
Thomas Gleixner | fc6d73d | 2016-02-26 18:43:40 +0000 | [diff] [blame] | 452 | cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); |
Russell King | e65f38e | 2005-06-18 09:33:31 +0100 | [diff] [blame] | 453 | } |
| 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | void __init smp_cpus_done(unsigned int max_cpus) |
| 456 | { |
Pavel Machek | 4bf9636 | 2015-01-04 20:01:23 +0100 | [diff] [blame] | 457 | int cpu; |
| 458 | unsigned long bogosum = 0; |
| 459 | |
| 460 | for_each_online_cpu(cpu) |
| 461 | bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; |
| 462 | |
| 463 | printk(KERN_INFO "SMP: Total of %d processors activated " |
| 464 | "(%lu.%02lu BogoMIPS).\n", |
| 465 | num_online_cpus(), |
| 466 | bogosum / (500000/HZ), |
| 467 | (bogosum / (5000/HZ)) % 100); |
| 468 | |
Dave Martin | 4588c34 | 2012-02-17 16:54:28 +0000 | [diff] [blame] | 469 | hyp_mode_check(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | void __init smp_prepare_boot_cpu(void) |
| 473 | { |
Rob Herring | 14318efb | 2012-11-29 20:39:54 +0100 | [diff] [blame] | 474 | set_my_cpu_offset(per_cpu_offset(smp_processor_id())); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
| 476 | |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 477 | void __init smp_prepare_cpus(unsigned int max_cpus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | { |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 479 | unsigned int ncores = num_possible_cpus(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
Vincent Guittot | c9018aa | 2011-08-08 13:21:59 +0100 | [diff] [blame] | 481 | init_cpu_topology(); |
| 482 | |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 483 | smp_store_cpu_info(smp_processor_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
| 485 | /* |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 486 | * are we trying to boot more cores than exist? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | */ |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 488 | if (max_cpus > ncores) |
| 489 | max_cpus = ncores; |
Stephen Boyd | 7fa22bd | 2011-07-07 01:56:51 +0100 | [diff] [blame] | 490 | if (ncores > 1 && max_cpus) { |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 491 | /* |
Stephen Boyd | 7fa22bd | 2011-07-07 01:56:51 +0100 | [diff] [blame] | 492 | * Initialise the present map, which describes the set of CPUs |
| 493 | * actually populated at the present time. A platform should |
Russell King | 0a30111 | 2013-01-14 15:54:28 +0000 | [diff] [blame] | 494 | * re-initialize the map in the platforms smp_prepare_cpus() |
| 495 | * if present != possible (e.g. physical hotplug). |
Stephen Boyd | 7fa22bd | 2011-07-07 01:56:51 +0100 | [diff] [blame] | 496 | */ |
Rusty Russell | 0b5f9c0 | 2012-03-29 15:38:30 +1030 | [diff] [blame] | 497 | init_cpu_present(cpu_possible_mask); |
Stephen Boyd | 7fa22bd | 2011-07-07 01:56:51 +0100 | [diff] [blame] | 498 | |
| 499 | /* |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 500 | * Initialise the SCU if there are more than one CPU |
| 501 | * and let them know where to start. |
| 502 | */ |
Russell King | 0a30111 | 2013-01-14 15:54:28 +0000 | [diff] [blame] | 503 | if (smp_ops.smp_prepare_cpus) |
| 504 | smp_ops.smp_prepare_cpus(max_cpus); |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 505 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
| 507 | |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 508 | static void (*__smp_cross_call)(const struct cpumask *, unsigned int); |
Russell King | 0f7b332 | 2011-04-03 13:01:30 +0100 | [diff] [blame] | 509 | |
| 510 | void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int)) |
| 511 | { |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 512 | if (!__smp_cross_call) |
| 513 | __smp_cross_call = fn; |
Russell King | 0f7b332 | 2011-04-03 13:01:30 +0100 | [diff] [blame] | 514 | } |
| 515 | |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 516 | static const char *ipi_types[NR_IPI] __tracepoint_string = { |
Stephen Boyd | 559a593 | 2012-09-19 08:16:07 +0100 | [diff] [blame] | 517 | #define S(x,s) [x] = s |
| 518 | S(IPI_WAKEUP, "CPU wakeup interrupts"), |
Russell King | 4a88abd | 2010-11-15 14:40:29 +0000 | [diff] [blame] | 519 | S(IPI_TIMER, "Timer broadcast interrupts"), |
| 520 | S(IPI_RESCHEDULE, "Rescheduling interrupts"), |
| 521 | S(IPI_CALL_FUNC, "Function call interrupts"), |
Russell King | 4a88abd | 2010-11-15 14:40:29 +0000 | [diff] [blame] | 522 | S(IPI_CPU_STOP, "CPU stop interrupts"), |
Stephen Boyd | bf18525 | 2013-10-29 20:32:56 +0100 | [diff] [blame] | 523 | S(IPI_IRQ_WORK, "IRQ work interrupts"), |
Nicolas Pitre | 5135d87 | 2012-11-27 21:54:41 -0500 | [diff] [blame] | 524 | S(IPI_COMPLETION, "completion interrupts"), |
Russell King | 4a88abd | 2010-11-15 14:40:29 +0000 | [diff] [blame] | 525 | }; |
| 526 | |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 527 | static void smp_cross_call(const struct cpumask *target, unsigned int ipinr) |
| 528 | { |
Paul E. McKenney | 7c64cc0 | 2016-04-26 10:42:25 -0700 | [diff] [blame] | 529 | trace_ipi_raise_rcuidle(target, ipi_types[ipinr]); |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 530 | __smp_cross_call(target, ipinr); |
| 531 | } |
| 532 | |
Maria Yu | d6862e3 | 2017-09-22 15:53:03 +0800 | [diff] [blame] | 533 | DEFINE_PER_CPU(bool, pending_ipi); |
| 534 | static void smp_cross_call_common(const struct cpumask *cpumask, |
| 535 | unsigned int func) |
| 536 | { |
| 537 | unsigned int cpu; |
| 538 | |
| 539 | for_each_cpu(cpu, cpumask) |
| 540 | per_cpu(pending_ipi, cpu) = true; |
| 541 | |
| 542 | smp_cross_call(cpumask, func); |
| 543 | } |
| 544 | |
Russell King | f13cd41 | 2010-11-15 14:33:51 +0000 | [diff] [blame] | 545 | void show_ipi_list(struct seq_file *p, int prec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
Russell King | 4a88abd | 2010-11-15 14:40:29 +0000 | [diff] [blame] | 547 | unsigned int cpu, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
Russell King | 4a88abd | 2010-11-15 14:40:29 +0000 | [diff] [blame] | 549 | for (i = 0; i < NR_IPI; i++) { |
| 550 | seq_printf(p, "%*s%u: ", prec - 1, "IPI", i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Nicolas Pitre | 026b7c6 | 2012-12-03 21:13:03 +0100 | [diff] [blame] | 552 | for_each_online_cpu(cpu) |
Russell King | 4a88abd | 2010-11-15 14:40:29 +0000 | [diff] [blame] | 553 | seq_printf(p, "%10u ", |
| 554 | __get_irq_stat(cpu, ipi_irqs[i])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
Russell King | 4a88abd | 2010-11-15 14:40:29 +0000 | [diff] [blame] | 556 | seq_printf(p, " %s\n", ipi_types[i]); |
| 557 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } |
| 559 | |
Russell King | b54992f | 2010-11-15 14:46:46 +0000 | [diff] [blame] | 560 | u64 smp_irq_stat_cpu(unsigned int cpu) |
Russell King | 37ee16a | 2005-11-08 19:08:05 +0000 | [diff] [blame] | 561 | { |
Russell King | b54992f | 2010-11-15 14:46:46 +0000 | [diff] [blame] | 562 | u64 sum = 0; |
| 563 | int i; |
Russell King | 37ee16a | 2005-11-08 19:08:05 +0000 | [diff] [blame] | 564 | |
Russell King | b54992f | 2010-11-15 14:46:46 +0000 | [diff] [blame] | 565 | for (i = 0; i < NR_IPI; i++) |
| 566 | sum += __get_irq_stat(cpu, ipi_irqs[i]); |
Russell King | 37ee16a | 2005-11-08 19:08:05 +0000 | [diff] [blame] | 567 | |
Russell King | b54992f | 2010-11-15 14:46:46 +0000 | [diff] [blame] | 568 | return sum; |
Russell King | 37ee16a | 2005-11-08 19:08:05 +0000 | [diff] [blame] | 569 | } |
| 570 | |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 571 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
| 572 | { |
Mahesh Sivasubramanian | 741a8ec | 2014-09-18 20:33:55 -0600 | [diff] [blame] | 573 | smp_cross_call_common(mask, IPI_CALL_FUNC); |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | void arch_send_wakeup_ipi_mask(const struct cpumask *mask) |
| 577 | { |
Mahesh Sivasubramanian | 741a8ec | 2014-09-18 20:33:55 -0600 | [diff] [blame] | 578 | smp_cross_call_common(mask, IPI_WAKEUP); |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | void arch_send_call_function_single_ipi(int cpu) |
| 582 | { |
Maria Yu | d6862e3 | 2017-09-22 15:53:03 +0800 | [diff] [blame] | 583 | smp_cross_call_common(cpumask_of(cpu), IPI_CALL_FUNC); |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | #ifdef CONFIG_IRQ_WORK |
| 587 | void arch_irq_work_raise(void) |
| 588 | { |
Frederic Weisbecker | 09f6edd | 2014-08-16 18:47:53 +0200 | [diff] [blame] | 589 | if (arch_irq_work_has_interrupt()) |
Mahesh Sivasubramanian | 741a8ec | 2014-09-18 20:33:55 -0600 | [diff] [blame] | 590 | smp_cross_call_common(cpumask_of(smp_processor_id()), |
| 591 | IPI_IRQ_WORK); |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 592 | } |
| 593 | #endif |
| 594 | |
Russell King | bc28248 | 2009-05-17 18:58:34 +0100 | [diff] [blame] | 595 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
Mark Rutland | 3d06770 | 2012-10-30 12:13:42 +0000 | [diff] [blame] | 596 | void tick_broadcast(const struct cpumask *mask) |
Russell King | bc28248 | 2009-05-17 18:58:34 +0100 | [diff] [blame] | 597 | { |
Mahesh Sivasubramanian | 741a8ec | 2014-09-18 20:33:55 -0600 | [diff] [blame] | 598 | smp_cross_call_common(mask, IPI_TIMER); |
Russell King | bc28248 | 2009-05-17 18:58:34 +0100 | [diff] [blame] | 599 | } |
Russell King | 5388a6b | 2010-07-26 13:19:43 +0100 | [diff] [blame] | 600 | #endif |
Russell King | bc28248 | 2009-05-17 18:58:34 +0100 | [diff] [blame] | 601 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 602 | static DEFINE_RAW_SPINLOCK(stop_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | /* |
| 605 | * ipi_cpu_stop - handle IPI from smp_send_stop() |
| 606 | */ |
| 607 | static void ipi_cpu_stop(unsigned int cpu) |
| 608 | { |
Russell King | 3d3f78d | 2010-07-26 13:31:27 +0100 | [diff] [blame] | 609 | if (system_state == SYSTEM_BOOTING || |
| 610 | system_state == SYSTEM_RUNNING) { |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 611 | raw_spin_lock(&stop_lock); |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 612 | pr_crit("CPU%u: stopping\n", cpu); |
Russell King | 3d3f78d | 2010-07-26 13:31:27 +0100 | [diff] [blame] | 613 | dump_stack(); |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 614 | raw_spin_unlock(&stop_lock); |
Russell King | 3d3f78d | 2010-07-26 13:31:27 +0100 | [diff] [blame] | 615 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
Russell King | e03cdad | 2009-05-28 14:16:52 +0100 | [diff] [blame] | 617 | set_cpu_online(cpu, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | local_fiq_disable(); |
| 620 | local_irq_disable(); |
| 621 | |
Russell King | 0f11d2c | 2018-04-10 11:35:36 +0100 | [diff] [blame] | 622 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | cpu_relax(); |
Russell King | 0f11d2c | 2018-04-10 11:35:36 +0100 | [diff] [blame] | 624 | wfe(); |
| 625 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | |
Nicolas Pitre | 5135d87 | 2012-11-27 21:54:41 -0500 | [diff] [blame] | 628 | static DEFINE_PER_CPU(struct completion *, cpu_completion); |
| 629 | |
| 630 | int register_ipi_completion(struct completion *completion, int cpu) |
| 631 | { |
| 632 | per_cpu(cpu_completion, cpu) = completion; |
| 633 | return IPI_COMPLETION; |
| 634 | } |
| 635 | |
| 636 | static void ipi_complete(unsigned int cpu) |
| 637 | { |
| 638 | complete(per_cpu(cpu_completion, cpu)); |
| 639 | } |
| 640 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | /* |
| 642 | * Main handler for inter-processor interrupts |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | */ |
Russell King | 4073723 | 2011-01-06 22:32:52 +0000 | [diff] [blame] | 644 | asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | { |
Shawn Guo | 0b5a1b95 | 2011-10-06 15:18:14 +0100 | [diff] [blame] | 646 | handle_IPI(ipinr, regs); |
| 647 | } |
| 648 | |
| 649 | void handle_IPI(int ipinr, struct pt_regs *regs) |
| 650 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | unsigned int cpu = smp_processor_id(); |
Russell King | c97d486 | 2006-10-25 13:59:16 +0100 | [diff] [blame] | 652 | struct pt_regs *old_regs = set_irq_regs(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 654 | if ((unsigned)ipinr < NR_IPI) { |
Stephen Boyd | 398f745 | 2015-06-19 21:37:56 +0100 | [diff] [blame] | 655 | trace_ipi_entry_rcuidle(ipi_types[ipinr]); |
Stephen Boyd | 559a593 | 2012-09-19 08:16:07 +0100 | [diff] [blame] | 656 | __inc_irq_stat(cpu, ipi_irqs[ipinr]); |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 657 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 659 | switch (ipinr) { |
Stephen Boyd | 559a593 | 2012-09-19 08:16:07 +0100 | [diff] [blame] | 660 | case IPI_WAKEUP: |
| 661 | break; |
| 662 | |
Mark Rutland | e2c5011 | 2012-10-30 11:17:01 +0000 | [diff] [blame] | 663 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 664 | case IPI_TIMER: |
Russell King | 7deabca | 2012-01-19 15:20:58 +0000 | [diff] [blame] | 665 | irq_enter(); |
Mark Rutland | e2c5011 | 2012-10-30 11:17:01 +0000 | [diff] [blame] | 666 | tick_receive_broadcast(); |
Russell King | 7deabca | 2012-01-19 15:20:58 +0000 | [diff] [blame] | 667 | irq_exit(); |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 668 | break; |
Mark Rutland | e2c5011 | 2012-10-30 11:17:01 +0000 | [diff] [blame] | 669 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 671 | case IPI_RESCHEDULE: |
Peter Zijlstra | 184748c | 2011-04-05 17:23:39 +0200 | [diff] [blame] | 672 | scheduler_ipi(); |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 673 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 675 | case IPI_CALL_FUNC: |
Russell King | 7deabca | 2012-01-19 15:20:58 +0000 | [diff] [blame] | 676 | irq_enter(); |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 677 | generic_smp_call_function_interrupt(); |
Russell King | 7deabca | 2012-01-19 15:20:58 +0000 | [diff] [blame] | 678 | irq_exit(); |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 679 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 681 | case IPI_CPU_STOP: |
Russell King | 7deabca | 2012-01-19 15:20:58 +0000 | [diff] [blame] | 682 | irq_enter(); |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 683 | ipi_cpu_stop(cpu); |
Russell King | 7deabca | 2012-01-19 15:20:58 +0000 | [diff] [blame] | 684 | irq_exit(); |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 685 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | |
Stephen Boyd | bf18525 | 2013-10-29 20:32:56 +0100 | [diff] [blame] | 687 | #ifdef CONFIG_IRQ_WORK |
| 688 | case IPI_IRQ_WORK: |
| 689 | irq_enter(); |
| 690 | irq_work_run(); |
| 691 | irq_exit(); |
| 692 | break; |
| 693 | #endif |
| 694 | |
Nicolas Pitre | 5135d87 | 2012-11-27 21:54:41 -0500 | [diff] [blame] | 695 | case IPI_COMPLETION: |
| 696 | irq_enter(); |
| 697 | ipi_complete(cpu); |
| 698 | irq_exit(); |
| 699 | break; |
| 700 | |
Russell King | 96f0e00 | 2014-09-03 23:57:13 +0100 | [diff] [blame] | 701 | case IPI_CPU_BACKTRACE: |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 702 | printk_nmi_enter(); |
Russell King | 96f0e00 | 2014-09-03 23:57:13 +0100 | [diff] [blame] | 703 | irq_enter(); |
| 704 | nmi_cpu_backtrace(regs); |
| 705 | irq_exit(); |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 706 | printk_nmi_exit(); |
Russell King | 96f0e00 | 2014-09-03 23:57:13 +0100 | [diff] [blame] | 707 | break; |
| 708 | |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 709 | default: |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 710 | pr_crit("CPU%u: Unknown IPI message 0x%x\n", |
| 711 | cpu, ipinr); |
Russell King | 24480d9 | 2010-11-15 09:54:18 +0000 | [diff] [blame] | 712 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | } |
Nicolas Pitre | 365ec7b | 2014-07-25 16:05:31 -0400 | [diff] [blame] | 714 | |
| 715 | if ((unsigned)ipinr < NR_IPI) |
Stephen Boyd | 398f745 | 2015-06-19 21:37:56 +0100 | [diff] [blame] | 716 | trace_ipi_exit_rcuidle(ipi_types[ipinr]); |
Raghavendra Kakarla | 09166f4 | 2018-04-30 22:38:56 +0530 | [diff] [blame] | 717 | |
| 718 | per_cpu(pending_ipi, cpu) = false; |
Russell King | c97d486 | 2006-10-25 13:59:16 +0100 | [diff] [blame] | 719 | set_irq_regs(old_regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | } |
| 721 | |
| 722 | void smp_send_reschedule(int cpu) |
| 723 | { |
Mahesh Sivasubramanian | 741a8ec | 2014-09-18 20:33:55 -0600 | [diff] [blame] | 724 | smp_cross_call_common(cpumask_of(cpu), IPI_RESCHEDULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } |
| 726 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | void smp_send_stop(void) |
| 728 | { |
Russell King | 28e1829 | 2010-12-02 09:53:54 +0000 | [diff] [blame] | 729 | unsigned long timeout; |
Will Deacon | 6fa99b7 | 2012-04-27 12:51:43 +0100 | [diff] [blame] | 730 | struct cpumask mask; |
Russell King | 28e1829 | 2010-12-02 09:53:54 +0000 | [diff] [blame] | 731 | |
Will Deacon | 6fa99b7 | 2012-04-27 12:51:43 +0100 | [diff] [blame] | 732 | cpumask_copy(&mask, cpu_online_mask); |
| 733 | cpumask_clear_cpu(smp_processor_id(), &mask); |
Javier Martinez Canillas | c5dff4f | 2012-07-28 15:19:55 +0100 | [diff] [blame] | 734 | if (!cpumask_empty(&mask)) |
Mahesh Sivasubramanian | 741a8ec | 2014-09-18 20:33:55 -0600 | [diff] [blame] | 735 | smp_cross_call_common(&mask, IPI_CPU_STOP); |
Russell King | 28e1829 | 2010-12-02 09:53:54 +0000 | [diff] [blame] | 736 | |
| 737 | /* Wait up to one second for other CPUs to stop */ |
| 738 | timeout = USEC_PER_SEC; |
| 739 | while (num_online_cpus() > 1 && timeout--) |
| 740 | udelay(1); |
| 741 | |
| 742 | if (num_online_cpus() > 1) |
Joe Perches | 8b521cb | 2014-09-16 20:41:43 +0100 | [diff] [blame] | 743 | pr_warn("SMP: failed to stop secondary CPUs\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | } |
| 745 | |
Yufen Wang | 13198d8 | 2018-11-02 11:51:31 +0100 | [diff] [blame] | 746 | /* In case panic() and panic() called at the same time on CPU1 and CPU2, |
| 747 | * and CPU 1 calls panic_smp_self_stop() before crash_smp_send_stop() |
| 748 | * CPU1 can't receive the ipi irqs from CPU2, CPU1 will be always online, |
| 749 | * kdump fails. So split out the panic_smp_self_stop() and add |
| 750 | * set_cpu_online(smp_processor_id(), false). |
| 751 | */ |
| 752 | void panic_smp_self_stop(void) |
| 753 | { |
| 754 | pr_debug("CPU %u will stop doing anything useful since another CPU has paniced\n", |
| 755 | smp_processor_id()); |
| 756 | set_cpu_online(smp_processor_id(), false); |
| 757 | while (1) |
| 758 | cpu_relax(); |
| 759 | } |
| 760 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | /* |
| 762 | * not supported here |
| 763 | */ |
Russell King | 5048bcb | 2007-07-23 12:59:46 +0100 | [diff] [blame] | 764 | int setup_profiling_timer(unsigned int multiplier) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | { |
| 766 | return -EINVAL; |
| 767 | } |
Richard Zhao | ec971ea | 2012-09-05 01:08:59 +0200 | [diff] [blame] | 768 | |
| 769 | #ifdef CONFIG_CPU_FREQ |
| 770 | |
| 771 | static DEFINE_PER_CPU(unsigned long, l_p_j_ref); |
| 772 | static DEFINE_PER_CPU(unsigned long, l_p_j_ref_freq); |
| 773 | static unsigned long global_l_p_j_ref; |
| 774 | static unsigned long global_l_p_j_ref_freq; |
| 775 | |
| 776 | static int cpufreq_callback(struct notifier_block *nb, |
| 777 | unsigned long val, void *data) |
| 778 | { |
| 779 | struct cpufreq_freqs *freq = data; |
| 780 | int cpu = freq->cpu; |
| 781 | |
| 782 | if (freq->flags & CPUFREQ_CONST_LOOPS) |
| 783 | return NOTIFY_OK; |
| 784 | |
| 785 | if (!per_cpu(l_p_j_ref, cpu)) { |
| 786 | per_cpu(l_p_j_ref, cpu) = |
| 787 | per_cpu(cpu_data, cpu).loops_per_jiffy; |
| 788 | per_cpu(l_p_j_ref_freq, cpu) = freq->old; |
| 789 | if (!global_l_p_j_ref) { |
| 790 | global_l_p_j_ref = loops_per_jiffy; |
| 791 | global_l_p_j_ref_freq = freq->old; |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) || |
Viresh Kumar | 0b443ea | 2014-03-19 11:24:58 +0530 | [diff] [blame] | 796 | (val == CPUFREQ_POSTCHANGE && freq->old > freq->new)) { |
Richard Zhao | ec971ea | 2012-09-05 01:08:59 +0200 | [diff] [blame] | 797 | loops_per_jiffy = cpufreq_scale(global_l_p_j_ref, |
| 798 | global_l_p_j_ref_freq, |
| 799 | freq->new); |
| 800 | per_cpu(cpu_data, cpu).loops_per_jiffy = |
| 801 | cpufreq_scale(per_cpu(l_p_j_ref, cpu), |
| 802 | per_cpu(l_p_j_ref_freq, cpu), |
| 803 | freq->new); |
| 804 | } |
| 805 | return NOTIFY_OK; |
| 806 | } |
| 807 | |
| 808 | static struct notifier_block cpufreq_notifier = { |
| 809 | .notifier_call = cpufreq_callback, |
| 810 | }; |
| 811 | |
| 812 | static int __init register_cpufreq_notifier(void) |
| 813 | { |
| 814 | return cpufreq_register_notifier(&cpufreq_notifier, |
| 815 | CPUFREQ_TRANSITION_NOTIFIER); |
| 816 | } |
| 817 | core_initcall(register_cpufreq_notifier); |
| 818 | |
| 819 | #endif |
Russell King | 96f0e00 | 2014-09-03 23:57:13 +0100 | [diff] [blame] | 820 | |
| 821 | static void raise_nmi(cpumask_t *mask) |
| 822 | { |
Mahesh Sivasubramanian | 741a8ec | 2014-09-18 20:33:55 -0600 | [diff] [blame] | 823 | /* |
| 824 | * Generate the backtrace directly if we are running in a calling |
| 825 | * context that is not preemptible by the backtrace IPI. Note |
| 826 | * that nmi_cpu_backtrace() automatically removes the current cpu |
| 827 | * from mask. |
| 828 | */ |
| 829 | if (cpumask_test_cpu(smp_processor_id(), mask) && irqs_disabled()) |
| 830 | nmi_cpu_backtrace(NULL); |
| 831 | |
Arnd Bergmann | 98e17ed | 2019-05-14 15:41:48 -0700 | [diff] [blame] | 832 | __smp_cross_call(mask, IPI_CPU_BACKTRACE); |
Russell King | 96f0e00 | 2014-09-03 23:57:13 +0100 | [diff] [blame] | 833 | } |
| 834 | |
Chris Metcalf | 9a01c3e | 2016-10-07 17:02:45 -0700 | [diff] [blame] | 835 | void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) |
Russell King | 96f0e00 | 2014-09-03 23:57:13 +0100 | [diff] [blame] | 836 | { |
Chris Metcalf | 9a01c3e | 2016-10-07 17:02:45 -0700 | [diff] [blame] | 837 | nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_nmi); |
Russell King | 96f0e00 | 2014-09-03 23:57:13 +0100 | [diff] [blame] | 838 | } |