Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * SMP support for ppc. |
| 3 | * |
| 4 | * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great |
| 5 | * deal of code from the sparc and intel versions. |
| 6 | * |
| 7 | * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> |
| 8 | * |
| 9 | * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and |
| 10 | * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | #undef DEBUG |
| 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/smp.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/delay.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/cache.h> |
| 29 | #include <linux/err.h> |
| 30 | #include <linux/sysdev.h> |
| 31 | #include <linux/cpu.h> |
| 32 | #include <linux/notifier.h> |
Anton Blanchard | 4b703a2 | 2005-12-13 06:56:47 +1100 | [diff] [blame] | 33 | #include <linux/topology.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #include <asm/ptrace.h> |
| 36 | #include <asm/atomic.h> |
| 37 | #include <asm/irq.h> |
| 38 | #include <asm/page.h> |
| 39 | #include <asm/pgtable.h> |
| 40 | #include <asm/prom.h> |
| 41 | #include <asm/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <asm/time.h> |
| 43 | #include <asm/machdep.h> |
Nathan Lynch | e2075f7 | 2008-07-27 15:24:52 +1000 | [diff] [blame] | 44 | #include <asm/cputhreads.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/cputable.h> |
| 46 | #include <asm/system.h> |
Stephen Rothwell | bbeb3f4 | 2005-09-27 13:51:59 +1000 | [diff] [blame] | 47 | #include <asm/mpic.h> |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 48 | #include <asm/vdso_datapage.h> |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 49 | #ifdef CONFIG_PPC64 |
| 50 | #include <asm/paca.h> |
| 51 | #endif |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #ifdef DEBUG |
Michael Ellerman | f9e4ec5 | 2005-11-15 15:16:38 +1100 | [diff] [blame] | 54 | #include <asm/udbg.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #define DBG(fmt...) udbg_printf(fmt) |
| 56 | #else |
| 57 | #define DBG(fmt...) |
| 58 | #endif |
| 59 | |
Michael Ellerman | f9e4ec5 | 2005-11-15 15:16:38 +1100 | [diff] [blame] | 60 | struct thread_info *secondary_ti; |
| 61 | |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 62 | DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE; |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 63 | DEFINE_PER_CPU(cpumask_t, cpu_core_map) = CPU_MASK_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 65 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 66 | EXPORT_PER_CPU_SYMBOL(cpu_core_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 68 | /* SMP operations for this machine */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | struct smp_ops_t *smp_ops; |
| 70 | |
Benjamin Herrenschmidt | 7ccbe50 | 2009-06-18 23:30:07 +0000 | [diff] [blame] | 71 | /* Can't be static due to PowerMac hackery */ |
| 72 | volatile unsigned int cpu_callin_map[NR_CPUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | int smt_enabled_at_boot = 1; |
| 75 | |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 76 | static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; |
| 77 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 78 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | void __devinit smp_generic_kick_cpu(int nr) |
| 80 | { |
| 81 | BUG_ON(nr < 0 || nr >= NR_CPUS); |
| 82 | |
| 83 | /* |
| 84 | * The processor is currently spinning, waiting for the |
| 85 | * cpu_start field to become non-zero After we set cpu_start, |
| 86 | * the processor will continue on to secondary_start |
| 87 | */ |
| 88 | paca[nr].cpu_start = 1; |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 89 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | } |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 91 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 93 | void smp_message_recv(int msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
| 95 | switch(msg) { |
| 96 | case PPC_MSG_CALL_FUNCTION: |
Jens Axboe | b7d7a24 | 2008-06-26 11:22:13 +0200 | [diff] [blame] | 97 | generic_smp_call_function_interrupt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | break; |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 99 | case PPC_MSG_RESCHEDULE: |
Milton Miller | 22d660f | 2008-10-10 01:56:45 +0000 | [diff] [blame] | 100 | /* we notice need_resched on exit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | break; |
Jens Axboe | b7d7a24 | 2008-06-26 11:22:13 +0200 | [diff] [blame] | 102 | case PPC_MSG_CALL_FUNC_SINGLE: |
| 103 | generic_smp_call_function_single_interrupt(); |
| 104 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | case PPC_MSG_DEBUGGER_BREAK: |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 106 | if (crash_ipi_function_ptr) { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 107 | crash_ipi_function_ptr(get_irq_regs()); |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 108 | break; |
| 109 | } |
| 110 | #ifdef CONFIG_DEBUGGER |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 111 | debugger_ipi(get_irq_regs()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | break; |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 113 | #endif /* CONFIG_DEBUGGER */ |
| 114 | /* FALLTHROUGH */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | default: |
| 116 | printk("SMP %d: smp_message_recv(): unknown msg %d\n", |
| 117 | smp_processor_id(), msg); |
| 118 | break; |
| 119 | } |
| 120 | } |
| 121 | |
Milton Miller | 25ddd73 | 2008-11-14 20:11:49 +0000 | [diff] [blame] | 122 | static irqreturn_t call_function_action(int irq, void *data) |
| 123 | { |
| 124 | generic_smp_call_function_interrupt(); |
| 125 | return IRQ_HANDLED; |
| 126 | } |
| 127 | |
| 128 | static irqreturn_t reschedule_action(int irq, void *data) |
| 129 | { |
| 130 | /* we just need the return path side effect of checking need_resched */ |
| 131 | return IRQ_HANDLED; |
| 132 | } |
| 133 | |
| 134 | static irqreturn_t call_function_single_action(int irq, void *data) |
| 135 | { |
| 136 | generic_smp_call_function_single_interrupt(); |
| 137 | return IRQ_HANDLED; |
| 138 | } |
| 139 | |
| 140 | static irqreturn_t debug_ipi_action(int irq, void *data) |
| 141 | { |
| 142 | smp_message_recv(PPC_MSG_DEBUGGER_BREAK); |
| 143 | return IRQ_HANDLED; |
| 144 | } |
| 145 | |
| 146 | static irq_handler_t smp_ipi_action[] = { |
| 147 | [PPC_MSG_CALL_FUNCTION] = call_function_action, |
| 148 | [PPC_MSG_RESCHEDULE] = reschedule_action, |
| 149 | [PPC_MSG_CALL_FUNC_SINGLE] = call_function_single_action, |
| 150 | [PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action, |
| 151 | }; |
| 152 | |
| 153 | const char *smp_ipi_name[] = { |
| 154 | [PPC_MSG_CALL_FUNCTION] = "ipi call function", |
| 155 | [PPC_MSG_RESCHEDULE] = "ipi reschedule", |
| 156 | [PPC_MSG_CALL_FUNC_SINGLE] = "ipi call function single", |
| 157 | [PPC_MSG_DEBUGGER_BREAK] = "ipi debugger", |
| 158 | }; |
| 159 | |
| 160 | /* optional function to request ipi, for controllers with >= 4 ipis */ |
| 161 | int smp_request_message_ipi(int virq, int msg) |
| 162 | { |
| 163 | int err; |
| 164 | |
| 165 | if (msg < 0 || msg > PPC_MSG_DEBUGGER_BREAK) { |
| 166 | return -EINVAL; |
| 167 | } |
| 168 | #if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC) |
| 169 | if (msg == PPC_MSG_DEBUGGER_BREAK) { |
| 170 | return 1; |
| 171 | } |
| 172 | #endif |
| 173 | err = request_irq(virq, smp_ipi_action[msg], IRQF_DISABLED|IRQF_PERCPU, |
| 174 | smp_ipi_name[msg], 0); |
| 175 | WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n", |
| 176 | virq, smp_ipi_name[msg], err); |
| 177 | |
| 178 | return err; |
| 179 | } |
| 180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | void smp_send_reschedule(int cpu) |
| 182 | { |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 183 | if (likely(smp_ops)) |
| 184 | smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
| 186 | |
Jens Axboe | b7d7a24 | 2008-06-26 11:22:13 +0200 | [diff] [blame] | 187 | void arch_send_call_function_single_ipi(int cpu) |
| 188 | { |
| 189 | smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNC_SINGLE); |
| 190 | } |
| 191 | |
| 192 | void arch_send_call_function_ipi(cpumask_t mask) |
| 193 | { |
| 194 | unsigned int cpu; |
| 195 | |
| 196 | for_each_cpu_mask(cpu, mask) |
| 197 | smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNCTION); |
| 198 | } |
| 199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | #ifdef CONFIG_DEBUGGER |
| 201 | void smp_send_debugger_break(int cpu) |
| 202 | { |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 203 | if (likely(smp_ops)) |
| 204 | smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
| 206 | #endif |
| 207 | |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 208 | #ifdef CONFIG_KEXEC |
| 209 | void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) |
| 210 | { |
| 211 | crash_ipi_function_ptr = crash_ipi_callback; |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 212 | if (crash_ipi_callback && smp_ops) { |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 213 | mb(); |
| 214 | smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_DEBUGGER_BREAK); |
| 215 | } |
| 216 | } |
| 217 | #endif |
| 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | static void stop_this_cpu(void *dummy) |
| 220 | { |
| 221 | local_irq_disable(); |
| 222 | while (1) |
| 223 | ; |
| 224 | } |
| 225 | |
Satyam Sharma | 8fd7675 | 2007-09-18 09:43:40 +1000 | [diff] [blame] | 226 | void smp_send_stop(void) |
| 227 | { |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 228 | smp_call_function(stop_this_cpu, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | struct thread_info *current_set[NR_CPUS]; |
| 232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | static void __devinit smp_store_cpu_info(int id) |
| 234 | { |
| 235 | per_cpu(pvr, id) = mfspr(SPRN_PVR); |
| 236 | } |
| 237 | |
| 238 | static void __init smp_create_idle(unsigned int cpu) |
| 239 | { |
| 240 | struct task_struct *p; |
| 241 | |
| 242 | /* create a process for the processor */ |
| 243 | p = fork_idle(cpu); |
| 244 | if (IS_ERR(p)) |
| 245 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 246 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | paca[cpu].__current = p; |
Paul Mackerras | 3b57506 | 2008-05-02 14:29:12 +1000 | [diff] [blame] | 248 | paca[cpu].kstack = (unsigned long) task_thread_info(p) |
| 249 | + THREAD_SIZE - STACK_FRAME_OVERHEAD; |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 250 | #endif |
Al Viro | b5e2fc1 | 2006-01-12 01:06:01 -0800 | [diff] [blame] | 251 | current_set[cpu] = task_thread_info(p); |
| 252 | task_thread_info(p)->cpu = cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 256 | { |
| 257 | unsigned int cpu; |
| 258 | |
| 259 | DBG("smp_prepare_cpus\n"); |
| 260 | |
| 261 | /* |
| 262 | * setup_cpu may need to be called on the boot cpu. We havent |
| 263 | * spun any cpus up but lets be paranoid. |
| 264 | */ |
| 265 | BUG_ON(boot_cpuid != smp_processor_id()); |
| 266 | |
| 267 | /* Fixup boot cpu */ |
| 268 | smp_store_cpu_info(boot_cpuid); |
| 269 | cpu_callin_map[boot_cpuid] = 1; |
| 270 | |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 271 | if (smp_ops) |
| 272 | max_cpus = smp_ops->probe(); |
| 273 | else |
| 274 | max_cpus = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | smp_space_timers(max_cpus); |
| 277 | |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 278 | for_each_possible_cpu(cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | if (cpu != boot_cpuid) |
| 280 | smp_create_idle(cpu); |
| 281 | } |
| 282 | |
| 283 | void __devinit smp_prepare_boot_cpu(void) |
| 284 | { |
| 285 | BUG_ON(smp_processor_id() != boot_cpuid); |
| 286 | |
| 287 | cpu_set(boot_cpuid, cpu_online_map); |
Nathan Lynch | e2075f7 | 2008-07-27 15:24:52 +1000 | [diff] [blame] | 288 | cpu_set(boot_cpuid, per_cpu(cpu_sibling_map, boot_cpuid)); |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 289 | cpu_set(boot_cpuid, per_cpu(cpu_core_map, boot_cpuid)); |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 290 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | paca[boot_cpuid].__current = current; |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 292 | #endif |
Al Viro | b5e2fc1 | 2006-01-12 01:06:01 -0800 | [diff] [blame] | 293 | current_set[boot_cpuid] = task_thread_info(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | #ifdef CONFIG_HOTPLUG_CPU |
| 297 | /* State of each CPU during hotplug phases */ |
| 298 | DEFINE_PER_CPU(int, cpu_state) = { 0 }; |
| 299 | |
| 300 | int generic_cpu_disable(void) |
| 301 | { |
| 302 | unsigned int cpu = smp_processor_id(); |
| 303 | |
| 304 | if (cpu == boot_cpuid) |
| 305 | return -EBUSY; |
| 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | cpu_clear(cpu, cpu_online_map); |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 308 | #ifdef CONFIG_PPC64 |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 309 | vdso_data->processorCount--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | fixup_irqs(cpu_online_map); |
Paul Mackerras | 094fe2e | 2005-11-10 14:26:12 +1100 | [diff] [blame] | 311 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | int generic_cpu_enable(unsigned int cpu) |
| 316 | { |
| 317 | /* Do the normal bootup if we haven't |
| 318 | * already bootstrapped. */ |
| 319 | if (system_state != SYSTEM_RUNNING) |
| 320 | return -ENOSYS; |
| 321 | |
| 322 | /* get the target out of it's holding state */ |
| 323 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 324 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
| 326 | while (!cpu_online(cpu)) |
| 327 | cpu_relax(); |
| 328 | |
Paul Mackerras | 094fe2e | 2005-11-10 14:26:12 +1100 | [diff] [blame] | 329 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | fixup_irqs(cpu_online_map); |
| 331 | /* counter the irq disable in fixup_irqs */ |
| 332 | local_irq_enable(); |
Paul Mackerras | 094fe2e | 2005-11-10 14:26:12 +1100 | [diff] [blame] | 333 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | void generic_cpu_die(unsigned int cpu) |
| 338 | { |
| 339 | int i; |
| 340 | |
| 341 | for (i = 0; i < 100; i++) { |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 342 | smp_rmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
| 344 | return; |
| 345 | msleep(100); |
| 346 | } |
| 347 | printk(KERN_ERR "CPU%d didn't die...\n", cpu); |
| 348 | } |
| 349 | |
| 350 | void generic_mach_cpu_die(void) |
| 351 | { |
| 352 | unsigned int cpu; |
| 353 | |
| 354 | local_irq_disable(); |
| 355 | cpu = smp_processor_id(); |
| 356 | printk(KERN_DEBUG "CPU%d offline\n", cpu); |
| 357 | __get_cpu_var(cpu_state) = CPU_DEAD; |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 358 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) |
| 360 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | cpu_set(cpu, cpu_online_map); |
| 362 | local_irq_enable(); |
| 363 | } |
| 364 | #endif |
| 365 | |
| 366 | static int __devinit cpu_enable(unsigned int cpu) |
| 367 | { |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 368 | if (smp_ops && smp_ops->cpu_enable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | return smp_ops->cpu_enable(cpu); |
| 370 | |
| 371 | return -ENOSYS; |
| 372 | } |
| 373 | |
Gautham R Shenoy | b282b6f | 2007-01-10 23:15:34 -0800 | [diff] [blame] | 374 | int __cpuinit __cpu_up(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | { |
| 376 | int c; |
| 377 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 378 | secondary_ti = current_set[cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | if (!cpu_enable(cpu)) |
| 380 | return 0; |
| 381 | |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 382 | if (smp_ops == NULL || |
| 383 | (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | return -EINVAL; |
| 385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | /* Make sure callin-map entry is 0 (can be leftover a CPU |
| 387 | * hotplug |
| 388 | */ |
| 389 | cpu_callin_map[cpu] = 0; |
| 390 | |
| 391 | /* The information for processor bringup must |
| 392 | * be written out to main store before we release |
| 393 | * the processor. |
| 394 | */ |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 395 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
| 397 | /* wake up cpus */ |
| 398 | DBG("smp: kicking cpu %d\n", cpu); |
| 399 | smp_ops->kick_cpu(cpu); |
| 400 | |
| 401 | /* |
| 402 | * wait to see if the cpu made a callin (is actually up). |
| 403 | * use this value that I found through experimentation. |
| 404 | * -- Cort |
| 405 | */ |
| 406 | if (system_state < SYSTEM_RUNNING) |
Jon Loeliger | ee0339f | 2006-06-17 17:52:44 -0500 | [diff] [blame] | 407 | for (c = 50000; c && !cpu_callin_map[cpu]; c--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | udelay(100); |
| 409 | #ifdef CONFIG_HOTPLUG_CPU |
| 410 | else |
| 411 | /* |
| 412 | * CPUs can take much longer to come up in the |
| 413 | * hotplug case. Wait five seconds. |
| 414 | */ |
| 415 | for (c = 25; c && !cpu_callin_map[cpu]; c--) { |
| 416 | msleep(200); |
| 417 | } |
| 418 | #endif |
| 419 | |
| 420 | if (!cpu_callin_map[cpu]) { |
| 421 | printk("Processor %u is stuck.\n", cpu); |
| 422 | return -ENOENT; |
| 423 | } |
| 424 | |
| 425 | printk("Processor %u found.\n", cpu); |
| 426 | |
| 427 | if (smp_ops->give_timebase) |
| 428 | smp_ops->give_timebase(); |
| 429 | |
| 430 | /* Wait until cpu puts itself in the online map */ |
| 431 | while (!cpu_online(cpu)) |
| 432 | cpu_relax(); |
| 433 | |
| 434 | return 0; |
| 435 | } |
| 436 | |
Nathan Lynch | e9efed3 | 2008-07-27 15:24:54 +1000 | [diff] [blame] | 437 | /* Return the value of the reg property corresponding to the given |
| 438 | * logical cpu. |
| 439 | */ |
| 440 | int cpu_to_core_id(int cpu) |
| 441 | { |
| 442 | struct device_node *np; |
| 443 | const int *reg; |
| 444 | int id = -1; |
| 445 | |
| 446 | np = of_get_cpu_node(cpu, NULL); |
| 447 | if (!np) |
| 448 | goto out; |
| 449 | |
| 450 | reg = of_get_property(np, "reg", NULL); |
| 451 | if (!reg) |
| 452 | goto out; |
| 453 | |
| 454 | id = *reg; |
| 455 | out: |
| 456 | of_node_put(np); |
| 457 | return id; |
| 458 | } |
| 459 | |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 460 | /* Must be called when no change can occur to cpu_present_map, |
| 461 | * i.e. during cpu online or offline. |
| 462 | */ |
| 463 | static struct device_node *cpu_to_l2cache(int cpu) |
| 464 | { |
| 465 | struct device_node *np; |
Nathan Lynch | b2ea25b | 2008-12-10 20:16:07 +0000 | [diff] [blame] | 466 | struct device_node *cache; |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 467 | |
| 468 | if (!cpu_present(cpu)) |
| 469 | return NULL; |
| 470 | |
| 471 | np = of_get_cpu_node(cpu, NULL); |
| 472 | if (np == NULL) |
| 473 | return NULL; |
| 474 | |
Nathan Lynch | b2ea25b | 2008-12-10 20:16:07 +0000 | [diff] [blame] | 475 | cache = of_find_next_cache_node(np); |
| 476 | |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 477 | of_node_put(np); |
| 478 | |
Nathan Lynch | b2ea25b | 2008-12-10 20:16:07 +0000 | [diff] [blame] | 479 | return cache; |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 480 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
| 482 | /* Activate a secondary processor. */ |
| 483 | int __devinit start_secondary(void *unused) |
| 484 | { |
| 485 | unsigned int cpu = smp_processor_id(); |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 486 | struct device_node *l2_cache; |
Nathan Lynch | e2075f7 | 2008-07-27 15:24:52 +1000 | [diff] [blame] | 487 | int i, base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
| 489 | atomic_inc(&init_mm.mm_count); |
| 490 | current->active_mm = &init_mm; |
| 491 | |
| 492 | smp_store_cpu_info(cpu); |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 493 | set_dec(tb_ticks_per_jiffy); |
Andrew Morton | e4d76e1 | 2005-11-09 15:45:30 -0800 | [diff] [blame] | 494 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | cpu_callin_map[cpu] = 1; |
| 496 | |
| 497 | smp_ops->setup_cpu(cpu); |
| 498 | if (smp_ops->take_timebase) |
| 499 | smp_ops->take_timebase(); |
| 500 | |
Nathan Lynch | 7d4d615 | 2006-02-06 22:44:23 -0600 | [diff] [blame] | 501 | if (system_state > SYSTEM_BOOTING) |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 502 | snapshot_timebase(); |
Nathan Lynch | 7d4d615 | 2006-02-06 22:44:23 -0600 | [diff] [blame] | 503 | |
Tony Breeds | d831d0b | 2007-09-21 13:26:03 +1000 | [diff] [blame] | 504 | secondary_cpu_time_init(); |
| 505 | |
Jens Axboe | b7d7a24 | 2008-06-26 11:22:13 +0200 | [diff] [blame] | 506 | ipi_call_lock(); |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 507 | notify_cpu_starting(cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | cpu_set(cpu, cpu_online_map); |
Nathan Lynch | e2075f7 | 2008-07-27 15:24:52 +1000 | [diff] [blame] | 509 | /* Update sibling maps */ |
| 510 | base = cpu_first_thread_in_core(cpu); |
| 511 | for (i = 0; i < threads_per_core; i++) { |
| 512 | if (cpu_is_offline(base + i)) |
| 513 | continue; |
| 514 | cpu_set(cpu, per_cpu(cpu_sibling_map, base + i)); |
| 515 | cpu_set(base + i, per_cpu(cpu_sibling_map, cpu)); |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 516 | |
| 517 | /* cpu_core_map should be a superset of |
| 518 | * cpu_sibling_map even if we don't have cache |
| 519 | * information, so update the former here, too. |
| 520 | */ |
| 521 | cpu_set(cpu, per_cpu(cpu_core_map, base +i)); |
| 522 | cpu_set(base + i, per_cpu(cpu_core_map, cpu)); |
Nathan Lynch | e2075f7 | 2008-07-27 15:24:52 +1000 | [diff] [blame] | 523 | } |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 524 | l2_cache = cpu_to_l2cache(cpu); |
| 525 | for_each_online_cpu(i) { |
| 526 | struct device_node *np = cpu_to_l2cache(i); |
| 527 | if (!np) |
| 528 | continue; |
| 529 | if (np == l2_cache) { |
| 530 | cpu_set(cpu, per_cpu(cpu_core_map, i)); |
| 531 | cpu_set(i, per_cpu(cpu_core_map, cpu)); |
| 532 | } |
| 533 | of_node_put(np); |
| 534 | } |
| 535 | of_node_put(l2_cache); |
Jens Axboe | b7d7a24 | 2008-06-26 11:22:13 +0200 | [diff] [blame] | 536 | ipi_call_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | local_irq_enable(); |
| 539 | |
| 540 | cpu_idle(); |
| 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | int setup_profiling_timer(unsigned int multiplier) |
| 545 | { |
| 546 | return 0; |
| 547 | } |
| 548 | |
| 549 | void __init smp_cpus_done(unsigned int max_cpus) |
| 550 | { |
| 551 | cpumask_t old_mask; |
| 552 | |
| 553 | /* We want the setup_cpu() here to be called from CPU 0, but our |
| 554 | * init thread may have been "borrowed" by another CPU in the meantime |
| 555 | * se we pin us down to CPU 0 for a short while |
| 556 | */ |
| 557 | old_mask = current->cpus_allowed; |
| 558 | set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid)); |
| 559 | |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 560 | if (smp_ops) |
| 561 | smp_ops->setup_cpu(boot_cpuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
| 563 | set_cpus_allowed(current, old_mask); |
Anton Blanchard | 4b703a2 | 2005-12-13 06:56:47 +1100 | [diff] [blame] | 564 | |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 565 | snapshot_timebases(); |
| 566 | |
Anton Blanchard | 4b703a2 | 2005-12-13 06:56:47 +1100 | [diff] [blame] | 567 | dump_numa_cpu_topology(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | } |
| 569 | |
| 570 | #ifdef CONFIG_HOTPLUG_CPU |
| 571 | int __cpu_disable(void) |
| 572 | { |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 573 | struct device_node *l2_cache; |
Nathan Lynch | e2075f7 | 2008-07-27 15:24:52 +1000 | [diff] [blame] | 574 | int cpu = smp_processor_id(); |
| 575 | int base, i; |
| 576 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Nathan Lynch | e2075f7 | 2008-07-27 15:24:52 +1000 | [diff] [blame] | 578 | if (!smp_ops->cpu_disable) |
| 579 | return -ENOSYS; |
| 580 | |
| 581 | err = smp_ops->cpu_disable(); |
| 582 | if (err) |
| 583 | return err; |
| 584 | |
| 585 | /* Update sibling maps */ |
| 586 | base = cpu_first_thread_in_core(cpu); |
| 587 | for (i = 0; i < threads_per_core; i++) { |
| 588 | cpu_clear(cpu, per_cpu(cpu_sibling_map, base + i)); |
| 589 | cpu_clear(base + i, per_cpu(cpu_sibling_map, cpu)); |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 590 | cpu_clear(cpu, per_cpu(cpu_core_map, base +i)); |
| 591 | cpu_clear(base + i, per_cpu(cpu_core_map, cpu)); |
Nathan Lynch | e2075f7 | 2008-07-27 15:24:52 +1000 | [diff] [blame] | 592 | } |
| 593 | |
Nathan Lynch | 440a085 | 2008-07-27 15:24:53 +1000 | [diff] [blame] | 594 | l2_cache = cpu_to_l2cache(cpu); |
| 595 | for_each_present_cpu(i) { |
| 596 | struct device_node *np = cpu_to_l2cache(i); |
| 597 | if (!np) |
| 598 | continue; |
| 599 | if (np == l2_cache) { |
| 600 | cpu_clear(cpu, per_cpu(cpu_core_map, i)); |
| 601 | cpu_clear(i, per_cpu(cpu_core_map, cpu)); |
| 602 | } |
| 603 | of_node_put(np); |
| 604 | } |
| 605 | of_node_put(l2_cache); |
| 606 | |
| 607 | |
Nathan Lynch | e2075f7 | 2008-07-27 15:24:52 +1000 | [diff] [blame] | 608 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | void __cpu_die(unsigned int cpu) |
| 612 | { |
| 613 | if (smp_ops->cpu_die) |
| 614 | smp_ops->cpu_die(cpu); |
| 615 | } |
| 616 | #endif |