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> |
| 44 | #include <asm/cputable.h> |
| 45 | #include <asm/system.h> |
Stephen Rothwell | bbeb3f4 | 2005-09-27 13:51:59 +1000 | [diff] [blame] | 46 | #include <asm/mpic.h> |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 47 | #include <asm/vdso_datapage.h> |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 48 | #ifdef CONFIG_PPC64 |
| 49 | #include <asm/paca.h> |
| 50 | #endif |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #ifdef DEBUG |
Michael Ellerman | f9e4ec5 | 2005-11-15 15:16:38 +1100 | [diff] [blame] | 53 | #include <asm/udbg.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #define DBG(fmt...) udbg_printf(fmt) |
| 55 | #else |
| 56 | #define DBG(fmt...) |
| 57 | #endif |
| 58 | |
Michael Ellerman | f9e4ec5 | 2005-11-15 15:16:38 +1100 | [diff] [blame] | 59 | int smp_hw_index[NR_CPUS]; |
| 60 | struct thread_info *secondary_ti; |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | cpumask_t cpu_possible_map = CPU_MASK_NONE; |
| 63 | cpumask_t cpu_online_map = CPU_MASK_NONE; |
| 64 | cpumask_t cpu_sibling_map[NR_CPUS] = { [0 ... NR_CPUS-1] = CPU_MASK_NONE }; |
| 65 | |
| 66 | EXPORT_SYMBOL(cpu_online_map); |
| 67 | EXPORT_SYMBOL(cpu_possible_map); |
| 68 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 69 | /* SMP operations for this machine */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | struct smp_ops_t *smp_ops; |
| 71 | |
| 72 | static volatile unsigned int cpu_callin_map[NR_CPUS]; |
| 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | void smp_call_function_interrupt(void); |
| 75 | |
| 76 | int smt_enabled_at_boot = 1; |
| 77 | |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 78 | static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; |
| 79 | |
Arnd Bergmann | cebf589 | 2005-06-23 09:43:43 +1000 | [diff] [blame] | 80 | #ifdef CONFIG_MPIC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | int __init smp_mpic_probe(void) |
| 82 | { |
| 83 | int nr_cpus; |
| 84 | |
| 85 | DBG("smp_mpic_probe()...\n"); |
| 86 | |
| 87 | nr_cpus = cpus_weight(cpu_possible_map); |
| 88 | |
| 89 | DBG("nr_cpus: %d\n", nr_cpus); |
| 90 | |
| 91 | if (nr_cpus > 1) |
| 92 | mpic_request_ipis(); |
| 93 | |
| 94 | return nr_cpus; |
| 95 | } |
| 96 | |
| 97 | void __devinit smp_mpic_setup_cpu(int cpu) |
| 98 | { |
| 99 | mpic_setup_this_cpu(); |
| 100 | } |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 101 | #endif /* CONFIG_MPIC */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 103 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | void __devinit smp_generic_kick_cpu(int nr) |
| 105 | { |
| 106 | BUG_ON(nr < 0 || nr >= NR_CPUS); |
| 107 | |
| 108 | /* |
| 109 | * The processor is currently spinning, waiting for the |
| 110 | * cpu_start field to become non-zero After we set cpu_start, |
| 111 | * the processor will continue on to secondary_start |
| 112 | */ |
| 113 | paca[nr].cpu_start = 1; |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 114 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | } |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 116 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame^] | 118 | void smp_message_recv(int msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
| 120 | switch(msg) { |
| 121 | case PPC_MSG_CALL_FUNCTION: |
| 122 | smp_call_function_interrupt(); |
| 123 | break; |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 124 | case PPC_MSG_RESCHEDULE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | /* XXX Do we have to do this? */ |
| 126 | set_need_resched(); |
| 127 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | case PPC_MSG_DEBUGGER_BREAK: |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 129 | if (crash_ipi_function_ptr) { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame^] | 130 | crash_ipi_function_ptr(get_irq_regs()); |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 131 | break; |
| 132 | } |
| 133 | #ifdef CONFIG_DEBUGGER |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame^] | 134 | debugger_ipi(get_irq_regs()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | break; |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 136 | #endif /* CONFIG_DEBUGGER */ |
| 137 | /* FALLTHROUGH */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | default: |
| 139 | printk("SMP %d: smp_message_recv(): unknown msg %d\n", |
| 140 | smp_processor_id(), msg); |
| 141 | break; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | void smp_send_reschedule(int cpu) |
| 146 | { |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 147 | if (likely(smp_ops)) |
| 148 | smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | #ifdef CONFIG_DEBUGGER |
| 152 | void smp_send_debugger_break(int cpu) |
| 153 | { |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 154 | if (likely(smp_ops)) |
| 155 | smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | #endif |
| 158 | |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 159 | #ifdef CONFIG_KEXEC |
| 160 | void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) |
| 161 | { |
| 162 | crash_ipi_function_ptr = crash_ipi_callback; |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 163 | if (crash_ipi_callback && smp_ops) { |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 164 | mb(); |
| 165 | smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_DEBUGGER_BREAK); |
| 166 | } |
| 167 | } |
| 168 | #endif |
| 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | static void stop_this_cpu(void *dummy) |
| 171 | { |
| 172 | local_irq_disable(); |
| 173 | while (1) |
| 174 | ; |
| 175 | } |
| 176 | |
| 177 | void smp_send_stop(void) |
| 178 | { |
| 179 | smp_call_function(stop_this_cpu, NULL, 1, 0); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Structure and data for smp_call_function(). This is designed to minimise |
| 184 | * static memory requirements. It also looks cleaner. |
| 185 | * Stolen from the i386 version. |
| 186 | */ |
| 187 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock); |
| 188 | |
| 189 | static struct call_data_struct { |
| 190 | void (*func) (void *info); |
| 191 | void *info; |
| 192 | atomic_t started; |
| 193 | atomic_t finished; |
| 194 | int wait; |
| 195 | } *call_data; |
| 196 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 197 | /* delay of at least 8 seconds */ |
| 198 | #define SMP_CALL_TIMEOUT 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | /* |
| 201 | * This function sends a 'generic call function' IPI to all other CPUs |
| 202 | * in the system. |
| 203 | * |
| 204 | * [SUMMARY] Run a function on all other CPUs. |
| 205 | * <func> The function to run. This must be fast and non-blocking. |
| 206 | * <info> An arbitrary pointer to pass to the function. |
| 207 | * <nonatomic> currently unused. |
| 208 | * <wait> If true, wait (atomically) until function has completed on other CPUs. |
| 209 | * [RETURNS] 0 on success, else a negative status code. Does not return until |
| 210 | * remote CPUs are nearly ready to execute <<func>> or are or have executed. |
| 211 | * |
| 212 | * You must not call this function with disabled interrupts or from a |
| 213 | * hardware interrupt handler or from a bottom half handler. |
| 214 | */ |
| 215 | int smp_call_function (void (*func) (void *info), void *info, int nonatomic, |
| 216 | int wait) |
| 217 | { |
| 218 | struct call_data_struct data; |
| 219 | int ret = -1, cpus; |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 220 | u64 timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
| 222 | /* Can deadlock when called with interrupts disabled */ |
| 223 | WARN_ON(irqs_disabled()); |
| 224 | |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 225 | if (unlikely(smp_ops == NULL)) |
| 226 | return -1; |
| 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | data.func = func; |
| 229 | data.info = info; |
| 230 | atomic_set(&data.started, 0); |
| 231 | data.wait = wait; |
| 232 | if (wait) |
| 233 | atomic_set(&data.finished, 0); |
| 234 | |
| 235 | spin_lock(&call_lock); |
| 236 | /* Must grab online cpu count with preempt disabled, otherwise |
| 237 | * it can change. */ |
| 238 | cpus = num_online_cpus() - 1; |
| 239 | if (!cpus) { |
| 240 | ret = 0; |
| 241 | goto out; |
| 242 | } |
| 243 | |
| 244 | call_data = &data; |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 245 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | /* Send a message to all other CPUs and wait for them to respond */ |
| 247 | smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_CALL_FUNCTION); |
| 248 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 249 | timeout = get_tb() + (u64) SMP_CALL_TIMEOUT * tb_ticks_per_sec; |
| 250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | /* Wait for response */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | while (atomic_read(&data.started) != cpus) { |
| 253 | HMT_low(); |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 254 | if (get_tb() >= timeout) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | printk("smp_call_function on cpu %d: other cpus not " |
| 256 | "responding (%d)\n", smp_processor_id(), |
| 257 | atomic_read(&data.started)); |
| 258 | debugger(NULL); |
| 259 | goto out; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | if (wait) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | while (atomic_read(&data.finished) != cpus) { |
| 265 | HMT_low(); |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 266 | if (get_tb() >= timeout) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | printk("smp_call_function on cpu %d: other " |
| 268 | "cpus not finishing (%d/%d)\n", |
| 269 | smp_processor_id(), |
| 270 | atomic_read(&data.finished), |
| 271 | atomic_read(&data.started)); |
| 272 | debugger(NULL); |
| 273 | goto out; |
| 274 | } |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | ret = 0; |
| 279 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 280 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | call_data = NULL; |
| 282 | HMT_medium(); |
| 283 | spin_unlock(&call_lock); |
| 284 | return ret; |
| 285 | } |
| 286 | |
| 287 | EXPORT_SYMBOL(smp_call_function); |
| 288 | |
| 289 | void smp_call_function_interrupt(void) |
| 290 | { |
| 291 | void (*func) (void *info); |
| 292 | void *info; |
| 293 | int wait; |
| 294 | |
| 295 | /* call_data will be NULL if the sender timed out while |
| 296 | * waiting on us to receive the call. |
| 297 | */ |
| 298 | if (!call_data) |
| 299 | return; |
| 300 | |
| 301 | func = call_data->func; |
| 302 | info = call_data->info; |
| 303 | wait = call_data->wait; |
| 304 | |
| 305 | if (!wait) |
| 306 | smp_mb__before_atomic_inc(); |
| 307 | |
| 308 | /* |
| 309 | * Notify initiating CPU that I've grabbed the data and am |
| 310 | * about to execute the function |
| 311 | */ |
| 312 | atomic_inc(&call_data->started); |
| 313 | /* |
| 314 | * At this point the info structure may be out of scope unless wait==1 |
| 315 | */ |
| 316 | (*func)(info); |
| 317 | if (wait) { |
| 318 | smp_mb__before_atomic_inc(); |
| 319 | atomic_inc(&call_data->finished); |
| 320 | } |
| 321 | } |
| 322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | extern struct gettimeofday_struct do_gtod; |
| 324 | |
| 325 | struct thread_info *current_set[NR_CPUS]; |
| 326 | |
| 327 | DECLARE_PER_CPU(unsigned int, pvr); |
| 328 | |
| 329 | static void __devinit smp_store_cpu_info(int id) |
| 330 | { |
| 331 | per_cpu(pvr, id) = mfspr(SPRN_PVR); |
| 332 | } |
| 333 | |
| 334 | static void __init smp_create_idle(unsigned int cpu) |
| 335 | { |
| 336 | struct task_struct *p; |
| 337 | |
| 338 | /* create a process for the processor */ |
| 339 | p = fork_idle(cpu); |
| 340 | if (IS_ERR(p)) |
| 341 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 342 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | paca[cpu].__current = p; |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 344 | #endif |
Al Viro | b5e2fc1 | 2006-01-12 01:06:01 -0800 | [diff] [blame] | 345 | current_set[cpu] = task_thread_info(p); |
| 346 | task_thread_info(p)->cpu = cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 350 | { |
| 351 | unsigned int cpu; |
| 352 | |
| 353 | DBG("smp_prepare_cpus\n"); |
| 354 | |
| 355 | /* |
| 356 | * setup_cpu may need to be called on the boot cpu. We havent |
| 357 | * spun any cpus up but lets be paranoid. |
| 358 | */ |
| 359 | BUG_ON(boot_cpuid != smp_processor_id()); |
| 360 | |
| 361 | /* Fixup boot cpu */ |
| 362 | smp_store_cpu_info(boot_cpuid); |
| 363 | cpu_callin_map[boot_cpuid] = 1; |
| 364 | |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 365 | if (smp_ops) |
| 366 | max_cpus = smp_ops->probe(); |
| 367 | else |
| 368 | max_cpus = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
| 370 | smp_space_timers(max_cpus); |
| 371 | |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 372 | for_each_possible_cpu(cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | if (cpu != boot_cpuid) |
| 374 | smp_create_idle(cpu); |
| 375 | } |
| 376 | |
| 377 | void __devinit smp_prepare_boot_cpu(void) |
| 378 | { |
| 379 | BUG_ON(smp_processor_id() != boot_cpuid); |
| 380 | |
| 381 | cpu_set(boot_cpuid, cpu_online_map); |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 382 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | paca[boot_cpuid].__current = current; |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 384 | #endif |
Al Viro | b5e2fc1 | 2006-01-12 01:06:01 -0800 | [diff] [blame] | 385 | current_set[boot_cpuid] = task_thread_info(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | } |
| 387 | |
| 388 | #ifdef CONFIG_HOTPLUG_CPU |
| 389 | /* State of each CPU during hotplug phases */ |
| 390 | DEFINE_PER_CPU(int, cpu_state) = { 0 }; |
| 391 | |
| 392 | int generic_cpu_disable(void) |
| 393 | { |
| 394 | unsigned int cpu = smp_processor_id(); |
| 395 | |
| 396 | if (cpu == boot_cpuid) |
| 397 | return -EBUSY; |
| 398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | cpu_clear(cpu, cpu_online_map); |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 400 | #ifdef CONFIG_PPC64 |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 401 | vdso_data->processorCount--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | fixup_irqs(cpu_online_map); |
Paul Mackerras | 094fe2e | 2005-11-10 14:26:12 +1100 | [diff] [blame] | 403 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | int generic_cpu_enable(unsigned int cpu) |
| 408 | { |
| 409 | /* Do the normal bootup if we haven't |
| 410 | * already bootstrapped. */ |
| 411 | if (system_state != SYSTEM_RUNNING) |
| 412 | return -ENOSYS; |
| 413 | |
| 414 | /* get the target out of it's holding state */ |
| 415 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 416 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
| 418 | while (!cpu_online(cpu)) |
| 419 | cpu_relax(); |
| 420 | |
Paul Mackerras | 094fe2e | 2005-11-10 14:26:12 +1100 | [diff] [blame] | 421 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | fixup_irqs(cpu_online_map); |
| 423 | /* counter the irq disable in fixup_irqs */ |
| 424 | local_irq_enable(); |
Paul Mackerras | 094fe2e | 2005-11-10 14:26:12 +1100 | [diff] [blame] | 425 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | void generic_cpu_die(unsigned int cpu) |
| 430 | { |
| 431 | int i; |
| 432 | |
| 433 | for (i = 0; i < 100; i++) { |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 434 | smp_rmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
| 436 | return; |
| 437 | msleep(100); |
| 438 | } |
| 439 | printk(KERN_ERR "CPU%d didn't die...\n", cpu); |
| 440 | } |
| 441 | |
| 442 | void generic_mach_cpu_die(void) |
| 443 | { |
| 444 | unsigned int cpu; |
| 445 | |
| 446 | local_irq_disable(); |
| 447 | cpu = smp_processor_id(); |
| 448 | printk(KERN_DEBUG "CPU%d offline\n", cpu); |
| 449 | __get_cpu_var(cpu_state) = CPU_DEAD; |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 450 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) |
| 452 | cpu_relax(); |
| 453 | |
Paul Mackerras | 094fe2e | 2005-11-10 14:26:12 +1100 | [diff] [blame] | 454 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | flush_tlb_pending(); |
Paul Mackerras | 094fe2e | 2005-11-10 14:26:12 +1100 | [diff] [blame] | 456 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | cpu_set(cpu, cpu_online_map); |
| 458 | local_irq_enable(); |
| 459 | } |
| 460 | #endif |
| 461 | |
| 462 | static int __devinit cpu_enable(unsigned int cpu) |
| 463 | { |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 464 | if (smp_ops && smp_ops->cpu_enable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | return smp_ops->cpu_enable(cpu); |
| 466 | |
| 467 | return -ENOSYS; |
| 468 | } |
| 469 | |
| 470 | int __devinit __cpu_up(unsigned int cpu) |
| 471 | { |
| 472 | int c; |
| 473 | |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 474 | secondary_ti = current_set[cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (!cpu_enable(cpu)) |
| 476 | return 0; |
| 477 | |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 478 | if (smp_ops == NULL || |
| 479 | (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | return -EINVAL; |
| 481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | /* Make sure callin-map entry is 0 (can be leftover a CPU |
| 483 | * hotplug |
| 484 | */ |
| 485 | cpu_callin_map[cpu] = 0; |
| 486 | |
| 487 | /* The information for processor bringup must |
| 488 | * be written out to main store before we release |
| 489 | * the processor. |
| 490 | */ |
Anton Blanchard | 0d8d4d4 | 2005-05-01 08:58:47 -0700 | [diff] [blame] | 491 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | |
| 493 | /* wake up cpus */ |
| 494 | DBG("smp: kicking cpu %d\n", cpu); |
| 495 | smp_ops->kick_cpu(cpu); |
| 496 | |
| 497 | /* |
| 498 | * wait to see if the cpu made a callin (is actually up). |
| 499 | * use this value that I found through experimentation. |
| 500 | * -- Cort |
| 501 | */ |
| 502 | if (system_state < SYSTEM_RUNNING) |
Jon Loeliger | ee0339f | 2006-06-17 17:52:44 -0500 | [diff] [blame] | 503 | for (c = 50000; c && !cpu_callin_map[cpu]; c--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | udelay(100); |
| 505 | #ifdef CONFIG_HOTPLUG_CPU |
| 506 | else |
| 507 | /* |
| 508 | * CPUs can take much longer to come up in the |
| 509 | * hotplug case. Wait five seconds. |
| 510 | */ |
| 511 | for (c = 25; c && !cpu_callin_map[cpu]; c--) { |
| 512 | msleep(200); |
| 513 | } |
| 514 | #endif |
| 515 | |
| 516 | if (!cpu_callin_map[cpu]) { |
| 517 | printk("Processor %u is stuck.\n", cpu); |
| 518 | return -ENOENT; |
| 519 | } |
| 520 | |
| 521 | printk("Processor %u found.\n", cpu); |
| 522 | |
| 523 | if (smp_ops->give_timebase) |
| 524 | smp_ops->give_timebase(); |
| 525 | |
| 526 | /* Wait until cpu puts itself in the online map */ |
| 527 | while (!cpu_online(cpu)) |
| 528 | cpu_relax(); |
| 529 | |
| 530 | return 0; |
| 531 | } |
| 532 | |
| 533 | |
| 534 | /* Activate a secondary processor. */ |
| 535 | int __devinit start_secondary(void *unused) |
| 536 | { |
| 537 | unsigned int cpu = smp_processor_id(); |
| 538 | |
| 539 | atomic_inc(&init_mm.mm_count); |
| 540 | current->active_mm = &init_mm; |
| 541 | |
| 542 | smp_store_cpu_info(cpu); |
Paul Mackerras | 5ad5707 | 2005-11-05 10:33:55 +1100 | [diff] [blame] | 543 | set_dec(tb_ticks_per_jiffy); |
Andrew Morton | e4d76e1 | 2005-11-09 15:45:30 -0800 | [diff] [blame] | 544 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | cpu_callin_map[cpu] = 1; |
| 546 | |
| 547 | smp_ops->setup_cpu(cpu); |
| 548 | if (smp_ops->take_timebase) |
| 549 | smp_ops->take_timebase(); |
| 550 | |
Nathan Lynch | 7d4d615 | 2006-02-06 22:44:23 -0600 | [diff] [blame] | 551 | if (system_state > SYSTEM_BOOTING) |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 552 | snapshot_timebase(); |
Nathan Lynch | 7d4d615 | 2006-02-06 22:44:23 -0600 | [diff] [blame] | 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | spin_lock(&call_lock); |
| 555 | cpu_set(cpu, cpu_online_map); |
| 556 | spin_unlock(&call_lock); |
| 557 | |
| 558 | local_irq_enable(); |
| 559 | |
| 560 | cpu_idle(); |
| 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | int setup_profiling_timer(unsigned int multiplier) |
| 565 | { |
| 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | void __init smp_cpus_done(unsigned int max_cpus) |
| 570 | { |
| 571 | cpumask_t old_mask; |
| 572 | |
| 573 | /* We want the setup_cpu() here to be called from CPU 0, but our |
| 574 | * init thread may have been "borrowed" by another CPU in the meantime |
| 575 | * se we pin us down to CPU 0 for a short while |
| 576 | */ |
| 577 | old_mask = current->cpus_allowed; |
| 578 | set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid)); |
| 579 | |
Benjamin Herrenschmidt | 8cffc6a | 2006-07-04 14:09:36 +1000 | [diff] [blame] | 580 | if (smp_ops) |
| 581 | smp_ops->setup_cpu(boot_cpuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | set_cpus_allowed(current, old_mask); |
Anton Blanchard | 4b703a2 | 2005-12-13 06:56:47 +1100 | [diff] [blame] | 584 | |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 585 | snapshot_timebases(); |
| 586 | |
Anton Blanchard | 4b703a2 | 2005-12-13 06:56:47 +1100 | [diff] [blame] | 587 | dump_numa_cpu_topology(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | #ifdef CONFIG_HOTPLUG_CPU |
| 591 | int __cpu_disable(void) |
| 592 | { |
| 593 | if (smp_ops->cpu_disable) |
| 594 | return smp_ops->cpu_disable(); |
| 595 | |
| 596 | return -ENOSYS; |
| 597 | } |
| 598 | |
| 599 | void __cpu_die(unsigned int cpu) |
| 600 | { |
| 601 | if (smp_ops->cpu_die) |
| 602 | smp_ops->cpu_die(cpu); |
| 603 | } |
| 604 | #endif |