Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 1 | /* |
| 2 | * SMP initialisation and IPI support |
| 3 | * Based on arch/arm/kernel/smp.c |
| 4 | * |
| 5 | * Copyright (C) 2012 ARM Ltd. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 20 | #include <linux/acpi.h> |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 21 | #include <linux/delay.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/cache.h> |
| 27 | #include <linux/profile.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/err.h> |
| 31 | #include <linux/cpu.h> |
| 32 | #include <linux/smp.h> |
| 33 | #include <linux/seq_file.h> |
| 34 | #include <linux/irq.h> |
| 35 | #include <linux/percpu.h> |
| 36 | #include <linux/clockchips.h> |
| 37 | #include <linux/completion.h> |
| 38 | #include <linux/of.h> |
Larry Bassel | eb631bb | 2014-05-12 16:48:51 +0100 | [diff] [blame] | 39 | #include <linux/irq_work.h> |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 40 | |
Andre Przywara | e039ee4 | 2014-11-14 15:54:08 +0000 | [diff] [blame] | 41 | #include <asm/alternative.h> |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 42 | #include <asm/atomic.h> |
| 43 | #include <asm/cacheflush.h> |
Mark Rutland | df85741 | 2014-07-16 16:32:44 +0100 | [diff] [blame] | 44 | #include <asm/cpu.h> |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 45 | #include <asm/cputype.h> |
Mark Rutland | cd1aebf | 2013-10-24 20:30:15 +0100 | [diff] [blame] | 46 | #include <asm/cpu_ops.h> |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 47 | #include <asm/mmu_context.h> |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 48 | #include <asm/numa.h> |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 49 | #include <asm/pgtable.h> |
| 50 | #include <asm/pgalloc.h> |
| 51 | #include <asm/processor.h> |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 52 | #include <asm/smp_plat.h> |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 53 | #include <asm/sections.h> |
| 54 | #include <asm/tlbflush.h> |
| 55 | #include <asm/ptrace.h> |
Jonas Rabenstein | 377bcff | 2015-07-29 12:07:57 +0100 | [diff] [blame] | 56 | #include <asm/virt.h> |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 57 | |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 58 | #define CREATE_TRACE_POINTS |
| 59 | #include <trace/events/ipi.h> |
| 60 | |
Mark Rutland | 75c9d93 | 2016-11-03 20:23:11 +0000 | [diff] [blame] | 61 | DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number); |
| 62 | EXPORT_PER_CPU_SYMBOL(cpu_number); |
| 63 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 64 | /* |
| 65 | * as from 2.5, kernels no longer have an init_tasks structure |
| 66 | * so we need some other way of telling a new secondary core |
| 67 | * where to place its SVC stack |
| 68 | */ |
| 69 | struct secondary_data secondary_data; |
Suzuki K Poulose | bb90527 | 2016-02-23 10:31:42 +0000 | [diff] [blame] | 70 | /* Number of CPUs which aren't online, but looping in kernel text. */ |
| 71 | int cpus_stuck_in_kernel; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 72 | |
| 73 | enum ipi_msg_type { |
| 74 | IPI_RESCHEDULE, |
| 75 | IPI_CALL_FUNC, |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 76 | IPI_CPU_STOP, |
Lorenzo Pieralisi | 1f85008 | 2013-09-04 10:55:17 +0100 | [diff] [blame] | 77 | IPI_TIMER, |
Larry Bassel | eb631bb | 2014-05-12 16:48:51 +0100 | [diff] [blame] | 78 | IPI_IRQ_WORK, |
Lorenzo Pieralisi | 5e89c55 | 2016-01-26 11:10:38 +0000 | [diff] [blame] | 79 | IPI_WAKEUP |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 80 | }; |
| 81 | |
Suzuki K Poulose | ac1ad20 | 2016-04-13 14:41:33 +0100 | [diff] [blame] | 82 | #ifdef CONFIG_ARM64_VHE |
| 83 | |
| 84 | /* Whether the boot CPU is running in HYP mode or not*/ |
| 85 | static bool boot_cpu_hyp_mode; |
| 86 | |
| 87 | static inline void save_boot_cpu_run_el(void) |
| 88 | { |
| 89 | boot_cpu_hyp_mode = is_kernel_in_hyp_mode(); |
| 90 | } |
| 91 | |
| 92 | static inline bool is_boot_cpu_in_hyp_mode(void) |
| 93 | { |
| 94 | return boot_cpu_hyp_mode; |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * Verify that a secondary CPU is running the kernel at the same |
| 99 | * EL as that of the boot CPU. |
| 100 | */ |
| 101 | void verify_cpu_run_el(void) |
| 102 | { |
| 103 | bool in_el2 = is_kernel_in_hyp_mode(); |
| 104 | bool boot_cpu_el2 = is_boot_cpu_in_hyp_mode(); |
| 105 | |
| 106 | if (in_el2 ^ boot_cpu_el2) { |
| 107 | pr_crit("CPU%d: mismatched Exception Level(EL%d) with boot CPU(EL%d)\n", |
| 108 | smp_processor_id(), |
| 109 | in_el2 ? 2 : 1, |
| 110 | boot_cpu_el2 ? 2 : 1); |
| 111 | cpu_panic_kernel(); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | #else |
| 116 | static inline void save_boot_cpu_run_el(void) {} |
| 117 | #endif |
| 118 | |
Suzuki K Poulose | bb90527 | 2016-02-23 10:31:42 +0000 | [diff] [blame] | 119 | #ifdef CONFIG_HOTPLUG_CPU |
| 120 | static int op_cpu_kill(unsigned int cpu); |
| 121 | #else |
| 122 | static inline int op_cpu_kill(unsigned int cpu) |
| 123 | { |
| 124 | return -ENOSYS; |
| 125 | } |
| 126 | #endif |
| 127 | |
| 128 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 129 | /* |
| 130 | * Boot a secondary CPU, and assign it the specified idle task. |
| 131 | * This also gives us the initial stack to use for this CPU. |
| 132 | */ |
Paul Gortmaker | b8c6453 | 2013-06-18 10:18:31 -0400 | [diff] [blame] | 133 | static int boot_secondary(unsigned int cpu, struct task_struct *idle) |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 134 | { |
Mark Rutland | 652af89 | 2013-10-24 20:30:16 +0100 | [diff] [blame] | 135 | if (cpu_ops[cpu]->cpu_boot) |
| 136 | return cpu_ops[cpu]->cpu_boot(cpu); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 137 | |
Mark Rutland | 652af89 | 2013-10-24 20:30:16 +0100 | [diff] [blame] | 138 | return -EOPNOTSUPP; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | static DECLARE_COMPLETION(cpu_running); |
| 142 | |
Paul Gortmaker | b8c6453 | 2013-06-18 10:18:31 -0400 | [diff] [blame] | 143 | int __cpu_up(unsigned int cpu, struct task_struct *idle) |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 144 | { |
| 145 | int ret; |
Suzuki K Poulose | bb90527 | 2016-02-23 10:31:42 +0000 | [diff] [blame] | 146 | long status; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 147 | |
| 148 | /* |
| 149 | * We need to tell the secondary core where to find its stack and the |
| 150 | * page tables. |
| 151 | */ |
Mark Rutland | 5b7e8f7 | 2016-11-03 20:23:13 +0000 | [diff] [blame] | 152 | secondary_data.task = idle; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 153 | secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; |
Suzuki K Poulose | bb90527 | 2016-02-23 10:31:42 +0000 | [diff] [blame] | 154 | update_cpu_boot_status(CPU_MMU_OFF); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 155 | __flush_dcache_area(&secondary_data, sizeof(secondary_data)); |
| 156 | |
| 157 | /* |
| 158 | * Now bring the CPU into our world. |
| 159 | */ |
| 160 | ret = boot_secondary(cpu, idle); |
| 161 | if (ret == 0) { |
| 162 | /* |
| 163 | * CPU was successfully started, wait for it to come online or |
| 164 | * time out. |
| 165 | */ |
| 166 | wait_for_completion_timeout(&cpu_running, |
| 167 | msecs_to_jiffies(1000)); |
| 168 | |
| 169 | if (!cpu_online(cpu)) { |
| 170 | pr_crit("CPU%u: failed to come online\n", cpu); |
| 171 | ret = -EIO; |
| 172 | } |
| 173 | } else { |
| 174 | pr_err("CPU%u: failed to boot: %d\n", cpu, ret); |
| 175 | } |
| 176 | |
Mark Rutland | 5b7e8f7 | 2016-11-03 20:23:13 +0000 | [diff] [blame] | 177 | secondary_data.task = NULL; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 178 | secondary_data.stack = NULL; |
Suzuki K Poulose | bb90527 | 2016-02-23 10:31:42 +0000 | [diff] [blame] | 179 | status = READ_ONCE(secondary_data.status); |
| 180 | if (ret && status) { |
| 181 | |
| 182 | if (status == CPU_MMU_OFF) |
| 183 | status = READ_ONCE(__early_cpu_boot_status); |
| 184 | |
| 185 | switch (status) { |
| 186 | default: |
| 187 | pr_err("CPU%u: failed in unknown state : 0x%lx\n", |
| 188 | cpu, status); |
| 189 | break; |
| 190 | case CPU_KILL_ME: |
| 191 | if (!op_cpu_kill(cpu)) { |
| 192 | pr_crit("CPU%u: died during early boot\n", cpu); |
| 193 | break; |
| 194 | } |
| 195 | /* Fall through */ |
| 196 | pr_crit("CPU%u: may not have shut down cleanly\n", cpu); |
| 197 | case CPU_STUCK_IN_KERNEL: |
| 198 | pr_crit("CPU%u: is stuck in kernel\n", cpu); |
| 199 | cpus_stuck_in_kernel++; |
| 200 | break; |
| 201 | case CPU_PANIC_KERNEL: |
| 202 | panic("CPU%u detected unsupported configuration\n", cpu); |
| 203 | } |
| 204 | } |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 205 | |
| 206 | return ret; |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * This is the secondary CPU boot entry. We're using this CPUs |
| 211 | * idle thread stack, but a set of temporary page tables. |
| 212 | */ |
Zhizhou Zhang | 40137ff | 2018-06-12 17:07:37 +0800 | [diff] [blame] | 213 | asmlinkage notrace void secondary_start_kernel(void) |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 214 | { |
| 215 | struct mm_struct *mm = &init_mm; |
Mark Rutland | e9865e5 | 2016-11-03 20:23:10 +0000 | [diff] [blame] | 216 | unsigned int cpu; |
| 217 | |
| 218 | cpu = task_cpu(current); |
| 219 | set_my_cpu_offset(per_cpu_offset(cpu)); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 220 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 221 | /* |
| 222 | * All kernel threads share the same mm context; grab a |
| 223 | * reference and switch to it. |
| 224 | */ |
| 225 | atomic_inc(&mm->mm_count); |
| 226 | current->active_mm = mm; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 227 | |
| 228 | /* |
| 229 | * TTBR0 is only used for the identity mapping at this stage. Make it |
| 230 | * point to zero page to avoid speculatively fetching new entries. |
| 231 | */ |
Mark Rutland | 9e8e865 | 2016-01-25 11:44:58 +0000 | [diff] [blame] | 232 | cpu_uninstall_idmap(); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 233 | |
| 234 | preempt_disable(); |
| 235 | trace_hardirqs_off(); |
| 236 | |
Suzuki K. Poulose | dbb4e15 | 2015-10-19 14:24:50 +0100 | [diff] [blame] | 237 | /* |
| 238 | * If the system has established the capabilities, make sure |
| 239 | * this CPU ticks all of those. If it doesn't, the CPU will |
| 240 | * fail to come online. |
| 241 | */ |
Suzuki K Poulose | c47a190 | 2016-09-09 14:07:10 +0100 | [diff] [blame] | 242 | check_local_cpu_capabilities(); |
Suzuki K. Poulose | dbb4e15 | 2015-10-19 14:24:50 +0100 | [diff] [blame] | 243 | |
Mark Rutland | 652af89 | 2013-10-24 20:30:16 +0100 | [diff] [blame] | 244 | if (cpu_ops[cpu]->cpu_postboot) |
| 245 | cpu_ops[cpu]->cpu_postboot(); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 246 | |
| 247 | /* |
Mark Rutland | df85741 | 2014-07-16 16:32:44 +0100 | [diff] [blame] | 248 | * Log the CPU info before it is marked online and might get read. |
| 249 | */ |
| 250 | cpuinfo_store_cpu(); |
| 251 | |
| 252 | /* |
Marc Zyngier | 7ade67b | 2013-11-04 16:55:22 +0000 | [diff] [blame] | 253 | * Enable GIC and timers. |
| 254 | */ |
| 255 | notify_cpu_starting(cpu); |
| 256 | |
David Daney | c18df0a | 2016-09-20 11:46:35 -0700 | [diff] [blame] | 257 | store_cpu_topology(cpu); |
Mark Brown | f6e763b | 2014-03-04 07:51:17 +0000 | [diff] [blame] | 258 | |
Marc Zyngier | 7ade67b | 2013-11-04 16:55:22 +0000 | [diff] [blame] | 259 | /* |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 260 | * OK, now it's safe to let the boot CPU continue. Wait for |
| 261 | * the CPU migration code to notice that the CPU is online |
| 262 | * before we continue. |
| 263 | */ |
Suzuki K. Poulose | 64f1781 | 2015-10-19 14:24:38 +0100 | [diff] [blame] | 264 | pr_info("CPU%u: Booted secondary processor [%08x]\n", |
| 265 | cpu, read_cpuid_id()); |
Suzuki K Poulose | bb90527 | 2016-02-23 10:31:42 +0000 | [diff] [blame] | 266 | update_cpu_boot_status(CPU_BOOT_SUCCESS); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 267 | set_cpu_online(cpu, true); |
Will Deacon | b3770b3 | 2012-11-07 17:00:05 +0000 | [diff] [blame] | 268 | complete(&cpu_running); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 269 | |
Catalin Marinas | 53ae3ac | 2013-07-19 15:08:15 +0100 | [diff] [blame] | 270 | local_irq_enable(); |
Catalin Marinas | b3bf6aa | 2013-11-21 14:46:17 +0000 | [diff] [blame] | 271 | local_async_enable(); |
Catalin Marinas | 53ae3ac | 2013-07-19 15:08:15 +0100 | [diff] [blame] | 272 | |
| 273 | /* |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 274 | * OK, it's off to the idle thread for us |
| 275 | */ |
Thomas Gleixner | fc6d73d | 2016-02-26 18:43:40 +0000 | [diff] [blame] | 276 | cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 277 | } |
| 278 | |
Mark Rutland | 9327e2c | 2013-10-24 20:30:18 +0100 | [diff] [blame] | 279 | #ifdef CONFIG_HOTPLUG_CPU |
| 280 | static int op_cpu_disable(unsigned int cpu) |
| 281 | { |
| 282 | /* |
| 283 | * If we don't have a cpu_die method, abort before we reach the point |
| 284 | * of no return. CPU0 may not have an cpu_ops, so test for it. |
| 285 | */ |
| 286 | if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_die) |
| 287 | return -EOPNOTSUPP; |
| 288 | |
| 289 | /* |
| 290 | * We may need to abort a hot unplug for some other mechanism-specific |
| 291 | * reason. |
| 292 | */ |
| 293 | if (cpu_ops[cpu]->cpu_disable) |
| 294 | return cpu_ops[cpu]->cpu_disable(cpu); |
| 295 | |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * __cpu_disable runs on the processor to be shutdown. |
| 301 | */ |
| 302 | int __cpu_disable(void) |
| 303 | { |
| 304 | unsigned int cpu = smp_processor_id(); |
| 305 | int ret; |
| 306 | |
| 307 | ret = op_cpu_disable(cpu); |
| 308 | if (ret) |
| 309 | return ret; |
| 310 | |
| 311 | /* |
| 312 | * Take this CPU offline. Once we clear this, we can't return, |
| 313 | * and we must not schedule until we're ready to give up the cpu. |
| 314 | */ |
| 315 | set_cpu_online(cpu, false); |
| 316 | |
| 317 | /* |
| 318 | * OK - migrate IRQs away from this CPU |
| 319 | */ |
Yang Yingliang | 217d453 | 2015-09-24 17:32:14 +0800 | [diff] [blame] | 320 | irq_migrate_all_off_this_cpu(); |
| 321 | |
Mark Rutland | 9327e2c | 2013-10-24 20:30:18 +0100 | [diff] [blame] | 322 | return 0; |
| 323 | } |
| 324 | |
Ashwin Chaugule | c814ca0 | 2014-05-07 10:18:36 -0400 | [diff] [blame] | 325 | static int op_cpu_kill(unsigned int cpu) |
| 326 | { |
| 327 | /* |
| 328 | * If we have no means of synchronising with the dying CPU, then assume |
| 329 | * that it is really dead. We can only wait for an arbitrary length of |
| 330 | * time and hope that it's dead, so let's skip the wait and just hope. |
| 331 | */ |
| 332 | if (!cpu_ops[cpu]->cpu_kill) |
Mark Rutland | 6b99c68c | 2015-04-20 17:55:30 +0100 | [diff] [blame] | 333 | return 0; |
Ashwin Chaugule | c814ca0 | 2014-05-07 10:18:36 -0400 | [diff] [blame] | 334 | |
| 335 | return cpu_ops[cpu]->cpu_kill(cpu); |
| 336 | } |
| 337 | |
Mark Rutland | 9327e2c | 2013-10-24 20:30:18 +0100 | [diff] [blame] | 338 | /* |
| 339 | * called on the thread which is asking for a CPU to be shutdown - |
| 340 | * waits until shutdown has completed, or it is timed out. |
| 341 | */ |
| 342 | void __cpu_die(unsigned int cpu) |
| 343 | { |
Mark Rutland | 6b99c68c | 2015-04-20 17:55:30 +0100 | [diff] [blame] | 344 | int err; |
| 345 | |
Paul E. McKenney | 0598127 | 2015-05-12 14:50:05 -0700 | [diff] [blame] | 346 | if (!cpu_wait_death(cpu, 5)) { |
Mark Rutland | 9327e2c | 2013-10-24 20:30:18 +0100 | [diff] [blame] | 347 | pr_crit("CPU%u: cpu didn't die\n", cpu); |
| 348 | return; |
| 349 | } |
| 350 | pr_notice("CPU%u: shutdown\n", cpu); |
Ashwin Chaugule | c814ca0 | 2014-05-07 10:18:36 -0400 | [diff] [blame] | 351 | |
| 352 | /* |
| 353 | * Now that the dying CPU is beyond the point of no return w.r.t. |
| 354 | * in-kernel synchronisation, try to get the firwmare to help us to |
| 355 | * verify that it has really left the kernel before we consider |
| 356 | * clobbering anything it might still be using. |
| 357 | */ |
Mark Rutland | 6b99c68c | 2015-04-20 17:55:30 +0100 | [diff] [blame] | 358 | err = op_cpu_kill(cpu); |
| 359 | if (err) |
| 360 | pr_warn("CPU%d may not have shut down cleanly: %d\n", |
| 361 | cpu, err); |
Mark Rutland | 9327e2c | 2013-10-24 20:30:18 +0100 | [diff] [blame] | 362 | } |
| 363 | |
| 364 | /* |
| 365 | * Called from the idle thread for the CPU which has been shutdown. |
| 366 | * |
| 367 | * Note that we disable IRQs here, but do not re-enable them |
| 368 | * before returning to the caller. This is also the behaviour |
| 369 | * of the other hotplug-cpu capable cores, so presumably coming |
| 370 | * out of idle fixes this. |
| 371 | */ |
| 372 | void cpu_die(void) |
| 373 | { |
| 374 | unsigned int cpu = smp_processor_id(); |
| 375 | |
| 376 | idle_task_exit(); |
| 377 | |
| 378 | local_irq_disable(); |
| 379 | |
| 380 | /* Tell __cpu_die() that this CPU is now safe to dispose of */ |
Paul E. McKenney | 0598127 | 2015-05-12 14:50:05 -0700 | [diff] [blame] | 381 | (void)cpu_report_death(); |
Mark Rutland | 9327e2c | 2013-10-24 20:30:18 +0100 | [diff] [blame] | 382 | |
| 383 | /* |
| 384 | * Actually shutdown the CPU. This must never fail. The specific hotplug |
| 385 | * mechanism must perform all required cache maintenance to ensure that |
| 386 | * no dirty lines are lost in the process of shutting down the CPU. |
| 387 | */ |
| 388 | cpu_ops[cpu]->cpu_die(cpu); |
| 389 | |
| 390 | BUG(); |
| 391 | } |
| 392 | #endif |
| 393 | |
Suzuki K Poulose | fce6361 | 2016-02-23 10:31:41 +0000 | [diff] [blame] | 394 | /* |
| 395 | * Kill the calling secondary CPU, early in bringup before it is turned |
| 396 | * online. |
| 397 | */ |
| 398 | void cpu_die_early(void) |
| 399 | { |
| 400 | int cpu = smp_processor_id(); |
| 401 | |
| 402 | pr_crit("CPU%d: will not boot\n", cpu); |
| 403 | |
| 404 | /* Mark this CPU absent */ |
| 405 | set_cpu_present(cpu, 0); |
| 406 | |
| 407 | #ifdef CONFIG_HOTPLUG_CPU |
Suzuki K Poulose | bb90527 | 2016-02-23 10:31:42 +0000 | [diff] [blame] | 408 | update_cpu_boot_status(CPU_KILL_ME); |
Suzuki K Poulose | fce6361 | 2016-02-23 10:31:41 +0000 | [diff] [blame] | 409 | /* Check if we can park ourselves */ |
| 410 | if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_die) |
| 411 | cpu_ops[cpu]->cpu_die(cpu); |
| 412 | #endif |
Suzuki K Poulose | bb90527 | 2016-02-23 10:31:42 +0000 | [diff] [blame] | 413 | update_cpu_boot_status(CPU_STUCK_IN_KERNEL); |
Suzuki K Poulose | fce6361 | 2016-02-23 10:31:41 +0000 | [diff] [blame] | 414 | |
| 415 | cpu_park_loop(); |
| 416 | } |
| 417 | |
Jonas Rabenstein | 377bcff | 2015-07-29 12:07:57 +0100 | [diff] [blame] | 418 | static void __init hyp_mode_check(void) |
| 419 | { |
| 420 | if (is_hyp_mode_available()) |
| 421 | pr_info("CPU: All CPU(s) started at EL2\n"); |
| 422 | else if (is_hyp_mode_mismatched()) |
| 423 | WARN_TAINT(1, TAINT_CPU_OUT_OF_SPEC, |
| 424 | "CPU: CPUs started in inconsistent modes"); |
| 425 | else |
| 426 | pr_info("CPU: All CPU(s) started at EL1\n"); |
| 427 | } |
| 428 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 429 | void __init smp_cpus_done(unsigned int max_cpus) |
| 430 | { |
Will Deacon | 326b16d | 2013-08-30 18:06:48 +0100 | [diff] [blame] | 431 | pr_info("SMP: Total of %d processors activated.\n", num_online_cpus()); |
Suzuki K. Poulose | 3a75578 | 2015-10-19 14:24:39 +0100 | [diff] [blame] | 432 | setup_cpu_features(); |
Jonas Rabenstein | 377bcff | 2015-07-29 12:07:57 +0100 | [diff] [blame] | 433 | hyp_mode_check(); |
| 434 | apply_alternatives_all(); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | void __init smp_prepare_boot_cpu(void) |
| 438 | { |
Suzuki K Poulose | 9113c2a | 2016-07-21 11:12:55 +0100 | [diff] [blame] | 439 | set_my_cpu_offset(per_cpu_offset(smp_processor_id())); |
Catalin Marinas | efd9e03 | 2016-09-05 18:25:48 +0100 | [diff] [blame] | 440 | /* |
| 441 | * Initialise the static keys early as they may be enabled by the |
| 442 | * cpufeature code. |
| 443 | */ |
| 444 | jump_label_init(); |
Suzuki K. Poulose | 4b998ff | 2015-10-19 14:24:40 +0100 | [diff] [blame] | 445 | cpuinfo_store_boot_cpu(); |
Suzuki K Poulose | ac1ad20 | 2016-04-13 14:41:33 +0100 | [diff] [blame] | 446 | save_boot_cpu_run_el(); |
Suzuki K Poulose | c47a190 | 2016-09-09 14:07:10 +0100 | [diff] [blame] | 447 | /* |
| 448 | * Run the errata work around checks on the boot CPU, once we have |
| 449 | * initialised the cpu feature infrastructure from |
| 450 | * cpuinfo_store_boot_cpu() above. |
| 451 | */ |
| 452 | update_cpu_errata_workarounds(); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 453 | } |
| 454 | |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 455 | static u64 __init of_get_cpu_mpidr(struct device_node *dn) |
| 456 | { |
| 457 | const __be32 *cell; |
| 458 | u64 hwid; |
| 459 | |
| 460 | /* |
| 461 | * A cpu node with missing "reg" property is |
| 462 | * considered invalid to build a cpu_logical_map |
| 463 | * entry. |
| 464 | */ |
| 465 | cell = of_get_property(dn, "reg", NULL); |
| 466 | if (!cell) { |
| 467 | pr_err("%s: missing reg property\n", dn->full_name); |
| 468 | return INVALID_HWID; |
| 469 | } |
| 470 | |
| 471 | hwid = of_read_number(cell, of_n_addr_cells(dn)); |
| 472 | /* |
| 473 | * Non affinity bits must be set to 0 in the DT |
| 474 | */ |
| 475 | if (hwid & ~MPIDR_HWID_BITMASK) { |
| 476 | pr_err("%s: invalid reg property\n", dn->full_name); |
| 477 | return INVALID_HWID; |
| 478 | } |
| 479 | return hwid; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * Duplicate MPIDRs are a recipe for disaster. Scan all initialized |
| 484 | * entries and check for duplicates. If any is found just ignore the |
| 485 | * cpu. cpu_logical_map was initialized to INVALID_HWID to avoid |
| 486 | * matching valid MPIDR values. |
| 487 | */ |
| 488 | static bool __init is_mpidr_duplicate(unsigned int cpu, u64 hwid) |
| 489 | { |
| 490 | unsigned int i; |
| 491 | |
| 492 | for (i = 1; (i < cpu) && (i < NR_CPUS); i++) |
| 493 | if (cpu_logical_map(i) == hwid) |
| 494 | return true; |
| 495 | return false; |
| 496 | } |
| 497 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 498 | /* |
Lorenzo Pieralisi | 819a882 | 2015-05-13 14:12:46 +0100 | [diff] [blame] | 499 | * Initialize cpu operations for a logical cpu and |
| 500 | * set it in the possible mask on success |
| 501 | */ |
| 502 | static int __init smp_cpu_setup(int cpu) |
| 503 | { |
| 504 | if (cpu_read_ops(cpu)) |
| 505 | return -ENODEV; |
| 506 | |
| 507 | if (cpu_ops[cpu]->cpu_init(cpu)) |
| 508 | return -ENODEV; |
| 509 | |
| 510 | set_cpu_possible(cpu, true); |
| 511 | |
| 512 | return 0; |
| 513 | } |
| 514 | |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 515 | static bool bootcpu_valid __initdata; |
| 516 | static unsigned int cpu_count = 1; |
| 517 | |
| 518 | #ifdef CONFIG_ACPI |
| 519 | /* |
| 520 | * acpi_map_gic_cpu_interface - parse processor MADT entry |
| 521 | * |
| 522 | * Carry out sanity checks on MADT processor entry and initialize |
| 523 | * cpu_logical_map on success |
| 524 | */ |
| 525 | static void __init |
| 526 | acpi_map_gic_cpu_interface(struct acpi_madt_generic_interrupt *processor) |
| 527 | { |
| 528 | u64 hwid = processor->arm_mpidr; |
| 529 | |
Hanjun Guo | f905892 | 2015-07-03 15:29:06 +0800 | [diff] [blame] | 530 | if (!(processor->flags & ACPI_MADT_ENABLED)) { |
| 531 | pr_debug("skipping disabled CPU entry with 0x%llx MPIDR\n", hwid); |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 532 | return; |
| 533 | } |
| 534 | |
Hanjun Guo | f905892 | 2015-07-03 15:29:06 +0800 | [diff] [blame] | 535 | if (hwid & ~MPIDR_HWID_BITMASK || hwid == INVALID_HWID) { |
| 536 | pr_err("skipping CPU entry with invalid MPIDR 0x%llx\n", hwid); |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 537 | return; |
| 538 | } |
| 539 | |
| 540 | if (is_mpidr_duplicate(cpu_count, hwid)) { |
| 541 | pr_err("duplicate CPU MPIDR 0x%llx in MADT\n", hwid); |
| 542 | return; |
| 543 | } |
| 544 | |
| 545 | /* Check if GICC structure of boot CPU is available in the MADT */ |
| 546 | if (cpu_logical_map(0) == hwid) { |
| 547 | if (bootcpu_valid) { |
| 548 | pr_err("duplicate boot CPU MPIDR: 0x%llx in MADT\n", |
| 549 | hwid); |
| 550 | return; |
| 551 | } |
| 552 | bootcpu_valid = true; |
Lorenzo Pieralisi | baa5567 | 2016-10-17 15:18:48 +0100 | [diff] [blame] | 553 | early_map_cpu_to_node(0, acpi_numa_get_nid(0, hwid)); |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 554 | return; |
| 555 | } |
| 556 | |
| 557 | if (cpu_count >= NR_CPUS) |
| 558 | return; |
| 559 | |
| 560 | /* map the logical cpu id to cpu MPIDR */ |
| 561 | cpu_logical_map(cpu_count) = hwid; |
| 562 | |
Lorenzo Pieralisi | 5e89c55 | 2016-01-26 11:10:38 +0000 | [diff] [blame] | 563 | /* |
| 564 | * Set-up the ACPI parking protocol cpu entries |
| 565 | * while initializing the cpu_logical_map to |
| 566 | * avoid parsing MADT entries multiple times for |
| 567 | * nothing (ie a valid cpu_logical_map entry should |
| 568 | * contain a valid parking protocol data set to |
| 569 | * initialize the cpu if the parking protocol is |
| 570 | * the only available enable method). |
| 571 | */ |
| 572 | acpi_set_mailbox_entry(cpu_count, processor); |
| 573 | |
Hanjun Guo | d8b47fc | 2016-05-24 15:35:44 -0700 | [diff] [blame] | 574 | early_map_cpu_to_node(cpu_count, acpi_numa_get_nid(cpu_count, hwid)); |
| 575 | |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 576 | cpu_count++; |
| 577 | } |
| 578 | |
| 579 | static int __init |
| 580 | acpi_parse_gic_cpu_interface(struct acpi_subtable_header *header, |
| 581 | const unsigned long end) |
| 582 | { |
| 583 | struct acpi_madt_generic_interrupt *processor; |
| 584 | |
| 585 | processor = (struct acpi_madt_generic_interrupt *)header; |
Al Stone | 99e3e3a | 2015-07-06 17:16:48 -0600 | [diff] [blame] | 586 | if (BAD_MADT_GICC_ENTRY(processor, end)) |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 587 | return -EINVAL; |
| 588 | |
| 589 | acpi_table_print_madt_entry(header); |
| 590 | |
| 591 | acpi_map_gic_cpu_interface(processor); |
| 592 | |
| 593 | return 0; |
| 594 | } |
| 595 | #else |
| 596 | #define acpi_table_parse_madt(...) do { } while (0) |
| 597 | #endif |
| 598 | |
Lorenzo Pieralisi | 819a882 | 2015-05-13 14:12:46 +0100 | [diff] [blame] | 599 | /* |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 600 | * Enumerate the possible CPU set from the device tree and build the |
| 601 | * cpu logical map array containing MPIDR values related to logical |
| 602 | * cpus. Assumes that cpu_logical_map(0) has already been initialized. |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 603 | */ |
Jisheng Zhang | 29b8302 | 2015-11-12 20:04:42 +0800 | [diff] [blame] | 604 | static void __init of_parse_and_init_cpus(void) |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 605 | { |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 606 | struct device_node *dn = NULL; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 607 | |
| 608 | while ((dn = of_find_node_by_type(dn, "cpu"))) { |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 609 | u64 hwid = of_get_cpu_mpidr(dn); |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 610 | |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 611 | if (hwid == INVALID_HWID) |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 612 | goto next; |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 613 | |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 614 | if (is_mpidr_duplicate(cpu_count, hwid)) { |
| 615 | pr_err("%s: duplicate cpu reg properties in the DT\n", |
| 616 | dn->full_name); |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 617 | goto next; |
| 618 | } |
| 619 | |
| 620 | /* |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 621 | * The numbering scheme requires that the boot CPU |
| 622 | * must be assigned logical id 0. Record it so that |
| 623 | * the logical map built from DT is validated and can |
| 624 | * be used. |
| 625 | */ |
| 626 | if (hwid == cpu_logical_map(0)) { |
| 627 | if (bootcpu_valid) { |
| 628 | pr_err("%s: duplicate boot cpu reg property in DT\n", |
| 629 | dn->full_name); |
| 630 | goto next; |
| 631 | } |
| 632 | |
| 633 | bootcpu_valid = true; |
Zhen Lei | 7ba5f60 | 2016-09-01 14:55:04 +0800 | [diff] [blame] | 634 | early_map_cpu_to_node(0, of_node_to_nid(dn)); |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 635 | |
| 636 | /* |
| 637 | * cpu_logical_map has already been |
| 638 | * initialized and the boot cpu doesn't need |
| 639 | * the enable-method so continue without |
| 640 | * incrementing cpu. |
| 641 | */ |
| 642 | continue; |
| 643 | } |
| 644 | |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 645 | if (cpu_count >= NR_CPUS) |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 646 | goto next; |
| 647 | |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 648 | pr_debug("cpu logical map 0x%llx\n", hwid); |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 649 | cpu_logical_map(cpu_count) = hwid; |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 650 | |
| 651 | early_map_cpu_to_node(cpu_count, of_node_to_nid(dn)); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 652 | next: |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 653 | cpu_count++; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 654 | } |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 655 | } |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 656 | |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 657 | /* |
| 658 | * Enumerate the possible CPU set from the device tree or ACPI and build the |
| 659 | * cpu logical map array containing MPIDR values related to logical |
| 660 | * cpus. Assumes that cpu_logical_map(0) has already been initialized. |
| 661 | */ |
| 662 | void __init smp_init_cpus(void) |
| 663 | { |
| 664 | int i; |
| 665 | |
| 666 | if (acpi_disabled) |
| 667 | of_parse_and_init_cpus(); |
| 668 | else |
| 669 | /* |
| 670 | * do a walk of MADT to determine how many CPUs |
| 671 | * we have including disabled CPUs, and get information |
| 672 | * we need for SMP init |
| 673 | */ |
| 674 | acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, |
| 675 | acpi_parse_gic_cpu_interface, 0); |
| 676 | |
Kefeng Wang | 50ee91b | 2016-08-09 10:30:49 +0800 | [diff] [blame] | 677 | if (cpu_count > nr_cpu_ids) |
| 678 | pr_warn("Number of cores (%d) exceeds configured maximum of %d - clipping\n", |
| 679 | cpu_count, nr_cpu_ids); |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 680 | |
| 681 | if (!bootcpu_valid) { |
Lorenzo Pieralisi | 0f07833 | 2015-05-13 14:12:47 +0100 | [diff] [blame] | 682 | pr_err("missing boot CPU MPIDR, not enabling secondaries\n"); |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 683 | return; |
| 684 | } |
| 685 | |
| 686 | /* |
Lorenzo Pieralisi | 819a882 | 2015-05-13 14:12:46 +0100 | [diff] [blame] | 687 | * We need to set the cpu_logical_map entries before enabling |
| 688 | * the cpus so that cpu processor description entries (DT cpu nodes |
| 689 | * and ACPI MADT entries) can be retrieved by matching the cpu hwid |
| 690 | * with entries in cpu_logical_map while initializing the cpus. |
| 691 | * If the cpu set-up fails, invalidate the cpu_logical_map entry. |
Javi Merino | 4c7aa00 | 2012-08-29 09:47:19 +0100 | [diff] [blame] | 692 | */ |
Kefeng Wang | 50ee91b | 2016-08-09 10:30:49 +0800 | [diff] [blame] | 693 | for (i = 1; i < nr_cpu_ids; i++) { |
Lorenzo Pieralisi | 819a882 | 2015-05-13 14:12:46 +0100 | [diff] [blame] | 694 | if (cpu_logical_map(i) != INVALID_HWID) { |
| 695 | if (smp_cpu_setup(i)) |
| 696 | cpu_logical_map(i) = INVALID_HWID; |
| 697 | } |
| 698 | } |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 702 | { |
Mark Rutland | cd1aebf | 2013-10-24 20:30:15 +0100 | [diff] [blame] | 703 | int err; |
Suzuki K Poulose | 44dbcc9 | 2016-04-22 12:25:35 +0100 | [diff] [blame] | 704 | unsigned int cpu; |
David Daney | c18df0a | 2016-09-20 11:46:35 -0700 | [diff] [blame] | 705 | unsigned int this_cpu; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 706 | |
Mark Brown | f6e763b | 2014-03-04 07:51:17 +0000 | [diff] [blame] | 707 | init_cpu_topology(); |
| 708 | |
David Daney | c18df0a | 2016-09-20 11:46:35 -0700 | [diff] [blame] | 709 | this_cpu = smp_processor_id(); |
| 710 | store_cpu_topology(this_cpu); |
| 711 | numa_store_cpu_info(this_cpu); |
Mark Brown | f6e763b | 2014-03-04 07:51:17 +0000 | [diff] [blame] | 712 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 713 | /* |
Suzuki K Poulose | e75118a | 2016-07-21 11:15:27 +0100 | [diff] [blame] | 714 | * If UP is mandated by "nosmp" (which implies "maxcpus=0"), don't set |
| 715 | * secondary CPUs present. |
| 716 | */ |
| 717 | if (max_cpus == 0) |
| 718 | return; |
| 719 | |
| 720 | /* |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 721 | * Initialise the present map (which describes the set of CPUs |
| 722 | * actually populated at the present time) and release the |
| 723 | * secondaries from the bootloader. |
| 724 | */ |
| 725 | for_each_possible_cpu(cpu) { |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 726 | |
Mark Rutland | 75c9d93 | 2016-11-03 20:23:11 +0000 | [diff] [blame] | 727 | per_cpu(cpu_number, cpu) = cpu; |
| 728 | |
Marc Zyngier | d329de3 | 2013-01-02 15:24:22 +0000 | [diff] [blame] | 729 | if (cpu == smp_processor_id()) |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 730 | continue; |
| 731 | |
Mark Rutland | cd1aebf | 2013-10-24 20:30:15 +0100 | [diff] [blame] | 732 | if (!cpu_ops[cpu]) |
Marc Zyngier | d329de3 | 2013-01-02 15:24:22 +0000 | [diff] [blame] | 733 | continue; |
| 734 | |
Mark Rutland | cd1aebf | 2013-10-24 20:30:15 +0100 | [diff] [blame] | 735 | err = cpu_ops[cpu]->cpu_prepare(cpu); |
Marc Zyngier | d329de3 | 2013-01-02 15:24:22 +0000 | [diff] [blame] | 736 | if (err) |
| 737 | continue; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 738 | |
| 739 | set_cpu_present(cpu, true); |
David Daney | c18df0a | 2016-09-20 11:46:35 -0700 | [diff] [blame] | 740 | numa_store_cpu_info(cpu); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 741 | } |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 742 | } |
| 743 | |
Frederic Weisbecker | 3631073 | 2014-08-16 18:48:05 +0200 | [diff] [blame] | 744 | void (*__smp_cross_call)(const struct cpumask *, unsigned int); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 745 | |
| 746 | void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int)) |
| 747 | { |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 748 | __smp_cross_call = fn; |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 749 | } |
| 750 | |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 751 | static const char *ipi_types[NR_IPI] __tracepoint_string = { |
| 752 | #define S(x,s) [x] = s |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 753 | S(IPI_RESCHEDULE, "Rescheduling interrupts"), |
| 754 | S(IPI_CALL_FUNC, "Function call interrupts"), |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 755 | S(IPI_CPU_STOP, "CPU stop interrupts"), |
Lorenzo Pieralisi | 1f85008 | 2013-09-04 10:55:17 +0100 | [diff] [blame] | 756 | S(IPI_TIMER, "Timer broadcast interrupts"), |
Larry Bassel | eb631bb | 2014-05-12 16:48:51 +0100 | [diff] [blame] | 757 | S(IPI_IRQ_WORK, "IRQ work interrupts"), |
Lorenzo Pieralisi | 5e89c55 | 2016-01-26 11:10:38 +0000 | [diff] [blame] | 758 | S(IPI_WAKEUP, "CPU wake-up interrupts"), |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 759 | }; |
| 760 | |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 761 | static void smp_cross_call(const struct cpumask *target, unsigned int ipinr) |
| 762 | { |
| 763 | trace_ipi_raise(target, ipi_types[ipinr]); |
| 764 | __smp_cross_call(target, ipinr); |
| 765 | } |
| 766 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 767 | void show_ipi_list(struct seq_file *p, int prec) |
| 768 | { |
| 769 | unsigned int cpu, i; |
| 770 | |
| 771 | for (i = 0; i < NR_IPI; i++) { |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 772 | seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i, |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 773 | prec >= 4 ? " " : ""); |
Sudeep KarkadaNagesha | 67317c2 | 2013-11-07 15:25:44 +0000 | [diff] [blame] | 774 | for_each_online_cpu(cpu) |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 775 | seq_printf(p, "%10u ", |
| 776 | __get_irq_stat(cpu, ipi_irqs[i])); |
| 777 | seq_printf(p, " %s\n", ipi_types[i]); |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | u64 smp_irq_stat_cpu(unsigned int cpu) |
| 782 | { |
| 783 | u64 sum = 0; |
| 784 | int i; |
| 785 | |
| 786 | for (i = 0; i < NR_IPI; i++) |
| 787 | sum += __get_irq_stat(cpu, ipi_irqs[i]); |
| 788 | |
| 789 | return sum; |
| 790 | } |
| 791 | |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 792 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
| 793 | { |
| 794 | smp_cross_call(mask, IPI_CALL_FUNC); |
| 795 | } |
| 796 | |
| 797 | void arch_send_call_function_single_ipi(int cpu) |
| 798 | { |
Jiang Liu | 0aaf0da | 2015-01-23 05:36:42 +0000 | [diff] [blame] | 799 | smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC); |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 800 | } |
| 801 | |
Lorenzo Pieralisi | 5e89c55 | 2016-01-26 11:10:38 +0000 | [diff] [blame] | 802 | #ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL |
| 803 | void arch_send_wakeup_ipi_mask(const struct cpumask *mask) |
| 804 | { |
| 805 | smp_cross_call(mask, IPI_WAKEUP); |
| 806 | } |
| 807 | #endif |
| 808 | |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 809 | #ifdef CONFIG_IRQ_WORK |
| 810 | void arch_irq_work_raise(void) |
| 811 | { |
| 812 | if (__smp_cross_call) |
| 813 | smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK); |
| 814 | } |
| 815 | #endif |
| 816 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 817 | /* |
| 818 | * ipi_cpu_stop - handle IPI from smp_send_stop() |
| 819 | */ |
| 820 | static void ipi_cpu_stop(unsigned int cpu) |
| 821 | { |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 822 | set_cpu_online(cpu, false); |
| 823 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 824 | local_irq_disable(); |
| 825 | |
| 826 | while (1) |
| 827 | cpu_relax(); |
| 828 | } |
| 829 | |
| 830 | /* |
| 831 | * Main handler for inter-processor interrupts |
| 832 | */ |
| 833 | void handle_IPI(int ipinr, struct pt_regs *regs) |
| 834 | { |
| 835 | unsigned int cpu = smp_processor_id(); |
| 836 | struct pt_regs *old_regs = set_irq_regs(regs); |
| 837 | |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 838 | if ((unsigned)ipinr < NR_IPI) { |
Stephen Boyd | be081d9 | 2015-06-24 13:14:18 -0700 | [diff] [blame] | 839 | trace_ipi_entry_rcuidle(ipi_types[ipinr]); |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 840 | __inc_irq_stat(cpu, ipi_irqs[ipinr]); |
| 841 | } |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 842 | |
| 843 | switch (ipinr) { |
| 844 | case IPI_RESCHEDULE: |
| 845 | scheduler_ipi(); |
| 846 | break; |
| 847 | |
| 848 | case IPI_CALL_FUNC: |
| 849 | irq_enter(); |
| 850 | generic_smp_call_function_interrupt(); |
| 851 | irq_exit(); |
| 852 | break; |
| 853 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 854 | case IPI_CPU_STOP: |
| 855 | irq_enter(); |
| 856 | ipi_cpu_stop(cpu); |
| 857 | irq_exit(); |
| 858 | break; |
| 859 | |
Lorenzo Pieralisi | 1f85008 | 2013-09-04 10:55:17 +0100 | [diff] [blame] | 860 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
| 861 | case IPI_TIMER: |
| 862 | irq_enter(); |
| 863 | tick_receive_broadcast(); |
| 864 | irq_exit(); |
| 865 | break; |
| 866 | #endif |
| 867 | |
Larry Bassel | eb631bb | 2014-05-12 16:48:51 +0100 | [diff] [blame] | 868 | #ifdef CONFIG_IRQ_WORK |
| 869 | case IPI_IRQ_WORK: |
| 870 | irq_enter(); |
| 871 | irq_work_run(); |
| 872 | irq_exit(); |
| 873 | break; |
| 874 | #endif |
| 875 | |
Lorenzo Pieralisi | 5e89c55 | 2016-01-26 11:10:38 +0000 | [diff] [blame] | 876 | #ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL |
| 877 | case IPI_WAKEUP: |
| 878 | WARN_ONCE(!acpi_parking_protocol_valid(cpu), |
| 879 | "CPU%u: Wake-up IPI outside the ACPI parking protocol\n", |
| 880 | cpu); |
| 881 | break; |
| 882 | #endif |
| 883 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 884 | default: |
| 885 | pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr); |
| 886 | break; |
| 887 | } |
Nicolas Pitre | 45ed695 | 2014-07-25 16:05:32 -0400 | [diff] [blame] | 888 | |
| 889 | if ((unsigned)ipinr < NR_IPI) |
Stephen Boyd | be081d9 | 2015-06-24 13:14:18 -0700 | [diff] [blame] | 890 | trace_ipi_exit_rcuidle(ipi_types[ipinr]); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 891 | set_irq_regs(old_regs); |
| 892 | } |
| 893 | |
| 894 | void smp_send_reschedule(int cpu) |
| 895 | { |
| 896 | smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); |
| 897 | } |
| 898 | |
Lorenzo Pieralisi | 1f85008 | 2013-09-04 10:55:17 +0100 | [diff] [blame] | 899 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
| 900 | void tick_broadcast(const struct cpumask *mask) |
| 901 | { |
| 902 | smp_cross_call(mask, IPI_TIMER); |
| 903 | } |
| 904 | #endif |
| 905 | |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 906 | void smp_send_stop(void) |
| 907 | { |
| 908 | unsigned long timeout; |
| 909 | |
| 910 | if (num_online_cpus() > 1) { |
| 911 | cpumask_t mask; |
| 912 | |
| 913 | cpumask_copy(&mask, cpu_online_mask); |
Rusty Russell | 434ed7f | 2015-03-05 10:49:18 +1030 | [diff] [blame] | 914 | cpumask_clear_cpu(smp_processor_id(), &mask); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 915 | |
Jan Glauber | 82611c1 | 2016-04-18 09:43:33 +0200 | [diff] [blame] | 916 | if (system_state == SYSTEM_BOOTING || |
| 917 | system_state == SYSTEM_RUNNING) |
| 918 | pr_crit("SMP: stopping secondary CPUs\n"); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 919 | smp_cross_call(&mask, IPI_CPU_STOP); |
| 920 | } |
| 921 | |
| 922 | /* Wait up to one second for other CPUs to stop */ |
| 923 | timeout = USEC_PER_SEC; |
| 924 | while (num_online_cpus() > 1 && timeout--) |
| 925 | udelay(1); |
| 926 | |
| 927 | if (num_online_cpus() > 1) |
Jan Glauber | 82611c1 | 2016-04-18 09:43:33 +0200 | [diff] [blame] | 928 | pr_warning("SMP: failed to stop secondary CPUs %*pbl\n", |
| 929 | cpumask_pr_args(cpu_online_mask)); |
Catalin Marinas | 08e875c | 2012-03-05 11:49:30 +0000 | [diff] [blame] | 930 | } |
| 931 | |
| 932 | /* |
| 933 | * not supported here |
| 934 | */ |
| 935 | int setup_profiling_timer(unsigned int multiplier) |
| 936 | { |
| 937 | return -EINVAL; |
| 938 | } |
James Morse | 5c492c3 | 2016-06-22 10:06:12 +0100 | [diff] [blame] | 939 | |
| 940 | static bool have_cpu_die(void) |
| 941 | { |
| 942 | #ifdef CONFIG_HOTPLUG_CPU |
| 943 | int any_cpu = raw_smp_processor_id(); |
| 944 | |
Mark Salter | 982d8d9 | 2017-03-24 09:53:56 -0400 | [diff] [blame] | 945 | if (cpu_ops[any_cpu] && cpu_ops[any_cpu]->cpu_die) |
James Morse | 5c492c3 | 2016-06-22 10:06:12 +0100 | [diff] [blame] | 946 | return true; |
| 947 | #endif |
| 948 | return false; |
| 949 | } |
| 950 | |
| 951 | bool cpus_are_stuck_in_kernel(void) |
| 952 | { |
| 953 | bool smp_spin_tables = (num_possible_cpus() > 1 && !have_cpu_die()); |
| 954 | |
| 955 | return !!cpus_stuck_in_kernel || smp_spin_tables; |
| 956 | } |