Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/smp.c |
| 3 | * |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 4 | * Copyright (C) IBM Corp. 1999,2006 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), |
| 6 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 7 | * Heiko Carstens (heiko.carstens@de.ibm.com) |
| 8 | * |
| 9 | * based on other smp stuff by |
| 10 | * (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net> |
| 11 | * (c) 1998 Ingo Molnar |
| 12 | * |
| 13 | * We work with logical cpu numbering everywhere we can. The only |
| 14 | * functions using the real cpu address (got from STAP) are the sigp |
| 15 | * functions. For all other functions we use the identity mapping. |
| 16 | * That means that cpu_number_map[i] == i for every cpu. cpu_number_map is |
| 17 | * used e.g. to find the idle task belonging to a logical cpu. Every array |
| 18 | * in the kernel is sorted by the logical cpu number and not by the physical |
| 19 | * one which is causing all the confusion with __cpu_logical_map and |
| 20 | * cpu_number_map in other architectures. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/mm.h> |
| 26 | #include <linux/spinlock.h> |
| 27 | #include <linux/kernel_stat.h> |
| 28 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/delay.h> |
| 30 | #include <linux/cache.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/cpu.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 33 | #include <linux/timex.h> |
| 34 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/sigp.h> |
| 36 | #include <asm/pgalloc.h> |
| 37 | #include <asm/irq.h> |
| 38 | #include <asm/s390_ext.h> |
| 39 | #include <asm/cpcmd.h> |
| 40 | #include <asm/tlbflush.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 41 | #include <asm/timer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | extern volatile int __cpu_logical_map[]; |
| 44 | |
| 45 | /* |
| 46 | * An array with a pointer the lowcore of every CPU. |
| 47 | */ |
| 48 | |
| 49 | struct _lowcore *lowcore_ptr[NR_CPUS]; |
| 50 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 51 | cpumask_t cpu_online_map = CPU_MASK_NONE; |
| 52 | cpumask_t cpu_possible_map = CPU_MASK_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | static struct task_struct *current_set[NR_CPUS]; |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | static void smp_ext_bitcall(int, ec_bit_sig); |
| 57 | static void smp_ext_bitcall_others(ec_bit_sig); |
| 58 | |
| 59 | /* |
Heiko Carstens | 0ec6766 | 2007-02-12 15:47:04 +0100 | [diff] [blame] | 60 | * Structure and data for smp_call_function(). This is designed to minimise |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | * static memory requirements. It also looks cleaner. |
| 62 | */ |
| 63 | static DEFINE_SPINLOCK(call_lock); |
| 64 | |
| 65 | struct call_data_struct { |
| 66 | void (*func) (void *info); |
| 67 | void *info; |
| 68 | atomic_t started; |
| 69 | atomic_t finished; |
| 70 | int wait; |
| 71 | }; |
| 72 | |
| 73 | static struct call_data_struct * call_data; |
| 74 | |
| 75 | /* |
| 76 | * 'Call function' interrupt callback |
| 77 | */ |
| 78 | static void do_call_function(void) |
| 79 | { |
| 80 | void (*func) (void *info) = call_data->func; |
| 81 | void *info = call_data->info; |
| 82 | int wait = call_data->wait; |
| 83 | |
| 84 | atomic_inc(&call_data->started); |
| 85 | (*func)(info); |
| 86 | if (wait) |
| 87 | atomic_inc(&call_data->finished); |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * this function sends a 'generic call function' IPI to all other CPUs |
| 92 | * in the system. |
| 93 | */ |
| 94 | |
| 95 | int smp_call_function (void (*func) (void *info), void *info, int nonatomic, |
| 96 | int wait) |
| 97 | /* |
| 98 | * [SUMMARY] Run a function on all other CPUs. |
| 99 | * <func> The function to run. This must be fast and non-blocking. |
| 100 | * <info> An arbitrary pointer to pass to the function. |
| 101 | * <nonatomic> currently unused. |
| 102 | * <wait> If true, wait (atomically) until function has completed on other CPUs. |
| 103 | * [RETURNS] 0 on success, else a negative status code. Does not return until |
| 104 | * remote CPUs are nearly ready to execute <<func>> or are or have executed. |
| 105 | * |
| 106 | * You must not call this function with disabled interrupts or from a |
Heiko Carstens | 0ec6766 | 2007-02-12 15:47:04 +0100 | [diff] [blame] | 107 | * hardware interrupt handler. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | */ |
| 109 | { |
| 110 | struct call_data_struct data; |
| 111 | int cpus = num_online_cpus()-1; |
| 112 | |
| 113 | if (cpus <= 0) |
| 114 | return 0; |
| 115 | |
Heiko Carstens | 0ec6766 | 2007-02-12 15:47:04 +0100 | [diff] [blame] | 116 | /* Can deadlock when interrupts are disabled or if in wrong context */ |
| 117 | WARN_ON(irqs_disabled() || in_irq()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | data.func = func; |
| 120 | data.info = info; |
| 121 | atomic_set(&data.started, 0); |
| 122 | data.wait = wait; |
| 123 | if (wait) |
| 124 | atomic_set(&data.finished, 0); |
| 125 | |
Heiko Carstens | 0ec6766 | 2007-02-12 15:47:04 +0100 | [diff] [blame] | 126 | spin_lock_bh(&call_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | call_data = &data; |
| 128 | /* Send a message to all other CPUs and wait for them to respond */ |
| 129 | smp_ext_bitcall_others(ec_call_function); |
| 130 | |
| 131 | /* Wait for response */ |
| 132 | while (atomic_read(&data.started) != cpus) |
| 133 | cpu_relax(); |
| 134 | |
| 135 | if (wait) |
| 136 | while (atomic_read(&data.finished) != cpus) |
| 137 | cpu_relax(); |
Heiko Carstens | 0ec6766 | 2007-02-12 15:47:04 +0100 | [diff] [blame] | 138 | spin_unlock_bh(&call_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * Call a function on one CPU |
| 145 | * cpu : the CPU the function should be executed on |
| 146 | * |
| 147 | * You must not call this function with disabled interrupts or from a |
| 148 | * hardware interrupt handler. You may call it from a bottom half. |
| 149 | * |
| 150 | * It is guaranteed that the called function runs on the specified CPU, |
| 151 | * preemption is disabled. |
| 152 | */ |
| 153 | int smp_call_function_on(void (*func) (void *info), void *info, |
| 154 | int nonatomic, int wait, int cpu) |
| 155 | { |
| 156 | struct call_data_struct data; |
| 157 | int curr_cpu; |
| 158 | |
| 159 | if (!cpu_online(cpu)) |
| 160 | return -EINVAL; |
| 161 | |
Heiko Carstens | 0ec6766 | 2007-02-12 15:47:04 +0100 | [diff] [blame] | 162 | /* Can deadlock when interrupts are disabled or if in wrong context */ |
| 163 | WARN_ON(irqs_disabled() || in_irq()); |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | /* disable preemption for local function call */ |
| 166 | curr_cpu = get_cpu(); |
| 167 | |
| 168 | if (curr_cpu == cpu) { |
| 169 | /* direct call to function */ |
| 170 | func(info); |
| 171 | put_cpu(); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | data.func = func; |
| 176 | data.info = info; |
| 177 | atomic_set(&data.started, 0); |
| 178 | data.wait = wait; |
| 179 | if (wait) |
| 180 | atomic_set(&data.finished, 0); |
| 181 | |
| 182 | spin_lock_bh(&call_lock); |
| 183 | call_data = &data; |
| 184 | smp_ext_bitcall(cpu, ec_call_function); |
| 185 | |
| 186 | /* Wait for response */ |
| 187 | while (atomic_read(&data.started) != 1) |
| 188 | cpu_relax(); |
| 189 | |
| 190 | if (wait) |
| 191 | while (atomic_read(&data.finished) != 1) |
| 192 | cpu_relax(); |
| 193 | |
| 194 | spin_unlock_bh(&call_lock); |
| 195 | put_cpu(); |
| 196 | return 0; |
| 197 | } |
| 198 | EXPORT_SYMBOL(smp_call_function_on); |
| 199 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 200 | static void do_send_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | { |
| 202 | int cpu, rc; |
| 203 | |
| 204 | /* stop all processors */ |
| 205 | for_each_online_cpu(cpu) { |
| 206 | if (cpu == smp_processor_id()) |
| 207 | continue; |
| 208 | do { |
| 209 | rc = signal_processor(cpu, sigp_stop); |
| 210 | } while (rc == sigp_busy); |
| 211 | } |
| 212 | } |
| 213 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 214 | static void do_store_status(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
| 216 | int cpu, rc; |
| 217 | |
| 218 | /* store status of all processors in their lowcores (real 0) */ |
| 219 | for_each_online_cpu(cpu) { |
| 220 | if (cpu == smp_processor_id()) |
| 221 | continue; |
| 222 | do { |
| 223 | rc = signal_processor_p( |
| 224 | (__u32)(unsigned long) lowcore_ptr[cpu], cpu, |
| 225 | sigp_store_status_at_address); |
| 226 | } while(rc == sigp_busy); |
| 227 | } |
| 228 | } |
| 229 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 230 | static void do_wait_for_stop(void) |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 231 | { |
| 232 | int cpu; |
| 233 | |
| 234 | /* Wait for all other cpus to enter stopped state */ |
| 235 | for_each_online_cpu(cpu) { |
| 236 | if (cpu == smp_processor_id()) |
| 237 | continue; |
| 238 | while(!smp_cpu_not_running(cpu)) |
| 239 | cpu_relax(); |
| 240 | } |
| 241 | } |
| 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | /* |
| 244 | * this function sends a 'stop' sigp to all other CPUs in the system. |
| 245 | * it goes straight through. |
| 246 | */ |
| 247 | void smp_send_stop(void) |
| 248 | { |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 249 | /* Disable all interrupts/machine checks */ |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 250 | __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | /* write magic number to zero page (absolute 0) */ |
| 253 | lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC; |
| 254 | |
| 255 | /* stop other processors. */ |
| 256 | do_send_stop(); |
| 257 | |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 258 | /* wait until other processors are stopped */ |
| 259 | do_wait_for_stop(); |
| 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | /* store status of other processors. */ |
| 262 | do_store_status(); |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Reboot, halt and power_off routines for SMP. |
| 267 | */ |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | void machine_restart_smp(char * __unused) |
| 270 | { |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 271 | smp_send_stop(); |
| 272 | do_reipl(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | void machine_halt_smp(void) |
| 276 | { |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 277 | smp_send_stop(); |
| 278 | if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) |
| 279 | __cpcmd(vmhalt_cmd, NULL, 0, NULL); |
| 280 | signal_processor(smp_processor_id(), sigp_stop_and_store_status); |
| 281 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | void machine_power_off_smp(void) |
| 285 | { |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 286 | smp_send_stop(); |
| 287 | if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) |
| 288 | __cpcmd(vmpoff_cmd, NULL, 0, NULL); |
| 289 | signal_processor(smp_processor_id(), sigp_stop_and_store_status); |
| 290 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | /* |
| 294 | * This is the main routine where commands issued by other |
| 295 | * cpus are handled. |
| 296 | */ |
| 297 | |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 298 | static void do_ext_call_interrupt(__u16 code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
| 300 | unsigned long bits; |
| 301 | |
| 302 | /* |
| 303 | * handle bit signal external calls |
| 304 | * |
| 305 | * For the ec_schedule signal we have to do nothing. All the work |
| 306 | * is done automatically when we return from the interrupt. |
| 307 | */ |
| 308 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
| 309 | |
| 310 | if (test_bit(ec_call_function, &bits)) |
| 311 | do_call_function(); |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * Send an external call sigp to another cpu and return without waiting |
| 316 | * for its completion. |
| 317 | */ |
| 318 | static void smp_ext_bitcall(int cpu, ec_bit_sig sig) |
| 319 | { |
| 320 | /* |
| 321 | * Set signaling bit in lowcore of target cpu and kick it |
| 322 | */ |
| 323 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
Heiko Carstens | 99b2d8d | 2005-07-27 11:45:00 -0700 | [diff] [blame] | 324 | while(signal_processor(cpu, sigp_emergency_signal) == sigp_busy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | udelay(10); |
| 326 | } |
| 327 | |
| 328 | /* |
| 329 | * Send an external call sigp to every other cpu in the system and |
| 330 | * return without waiting for its completion. |
| 331 | */ |
| 332 | static void smp_ext_bitcall_others(ec_bit_sig sig) |
| 333 | { |
| 334 | int cpu; |
| 335 | |
| 336 | for_each_online_cpu(cpu) { |
| 337 | if (cpu == smp_processor_id()) |
| 338 | continue; |
| 339 | /* |
| 340 | * Set signaling bit in lowcore of target cpu and kick it |
| 341 | */ |
| 342 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
Heiko Carstens | 99b2d8d | 2005-07-27 11:45:00 -0700 | [diff] [blame] | 343 | while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | udelay(10); |
| 345 | } |
| 346 | } |
| 347 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 348 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | /* |
| 350 | * this function sends a 'purge tlb' signal to another CPU. |
| 351 | */ |
| 352 | void smp_ptlb_callback(void *info) |
| 353 | { |
| 354 | local_flush_tlb(); |
| 355 | } |
| 356 | |
| 357 | void smp_ptlb_all(void) |
| 358 | { |
| 359 | on_each_cpu(smp_ptlb_callback, NULL, 0, 1); |
| 360 | } |
| 361 | EXPORT_SYMBOL(smp_ptlb_all); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 362 | #endif /* ! CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
| 364 | /* |
| 365 | * this function sends a 'reschedule' IPI to another CPU. |
| 366 | * it goes straight through and wastes no time serializing |
| 367 | * anything. Worst case is that we lose a reschedule ... |
| 368 | */ |
| 369 | void smp_send_reschedule(int cpu) |
| 370 | { |
| 371 | smp_ext_bitcall(cpu, ec_schedule); |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * parameter area for the set/clear control bit callbacks |
| 376 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 377 | struct ec_creg_mask_parms { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | unsigned long orvals[16]; |
| 379 | unsigned long andvals[16]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 380 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | /* |
| 383 | * callback for setting/clearing control bits |
| 384 | */ |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 385 | static void smp_ctl_bit_callback(void *info) { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 386 | struct ec_creg_mask_parms *pp = info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | unsigned long cregs[16]; |
| 388 | int i; |
| 389 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 390 | __ctl_store(cregs, 0, 15); |
| 391 | for (i = 0; i <= 15; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 393 | __ctl_load(cregs, 0, 15); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Set a bit in a control register of all cpus |
| 398 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 399 | void smp_ctl_set_bit(int cr, int bit) |
| 400 | { |
| 401 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 403 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 404 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | parms.orvals[cr] = 1 << bit; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 406 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | } |
| 408 | |
| 409 | /* |
| 410 | * Clear a bit in a control register of all cpus |
| 411 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 412 | void smp_ctl_clear_bit(int cr, int bit) |
| 413 | { |
| 414 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 416 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 417 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | parms.andvals[cr] = ~(1L << bit); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 419 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | /* |
| 423 | * Lets check how many CPUs we have. |
| 424 | */ |
| 425 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 426 | static unsigned int |
| 427 | __init smp_count_cpus(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | { |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 429 | unsigned int cpu, num_cpus; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | __u16 boot_cpu_addr; |
| 431 | |
| 432 | /* |
| 433 | * cpu 0 is the boot cpu. See smp_prepare_boot_cpu. |
| 434 | */ |
| 435 | |
| 436 | boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr; |
| 437 | current_thread_info()->cpu = 0; |
| 438 | num_cpus = 1; |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 439 | for (cpu = 0; cpu <= 65535; cpu++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | if ((__u16) cpu == boot_cpu_addr) |
| 441 | continue; |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 442 | __cpu_logical_map[1] = (__u16) cpu; |
| 443 | if (signal_processor(1, sigp_sense) == |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | sigp_not_operational) |
| 445 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | num_cpus++; |
| 447 | } |
| 448 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | printk("Detected %d CPU's\n",(int) num_cpus); |
| 450 | printk("Boot cpu address %2X\n", boot_cpu_addr); |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 451 | |
| 452 | return num_cpus; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | /* |
| 456 | * Activate a secondary processor. |
| 457 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | int __devinit start_secondary(void *cpuvoid) |
| 459 | { |
| 460 | /* Setup the cpu */ |
| 461 | cpu_init(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 462 | preempt_disable(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 463 | /* Enable TOD clock interrupts on the secondary cpu. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | init_cpu_timer(); |
| 465 | #ifdef CONFIG_VIRT_TIMER |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 466 | /* Enable cpu timer interrupts on the secondary cpu. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | init_cpu_vtimer(); |
| 468 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | /* Enable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 470 | pfault_init(); |
| 471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | /* Mark this cpu as online */ |
| 473 | cpu_set(smp_processor_id(), cpu_online_map); |
| 474 | /* Switch on interrupts */ |
| 475 | local_irq_enable(); |
| 476 | /* Print info about this processor */ |
| 477 | print_cpu_info(&S390_lowcore.cpu_data); |
| 478 | /* cpu_idle will call schedule for us */ |
| 479 | cpu_idle(); |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | static void __init smp_create_idle(unsigned int cpu) |
| 484 | { |
| 485 | struct task_struct *p; |
| 486 | |
| 487 | /* |
| 488 | * don't care about the psw and regs settings since we'll never |
| 489 | * reschedule the forked task. |
| 490 | */ |
| 491 | p = fork_idle(cpu); |
| 492 | if (IS_ERR(p)) |
| 493 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); |
| 494 | current_set[cpu] = p; |
| 495 | } |
| 496 | |
| 497 | /* Reserving and releasing of CPUs */ |
| 498 | |
| 499 | static DEFINE_SPINLOCK(smp_reserve_lock); |
| 500 | static int smp_cpu_reserved[NR_CPUS]; |
| 501 | |
| 502 | int |
| 503 | smp_get_cpu(cpumask_t cpu_mask) |
| 504 | { |
| 505 | unsigned long flags; |
| 506 | int cpu; |
| 507 | |
| 508 | spin_lock_irqsave(&smp_reserve_lock, flags); |
| 509 | /* Try to find an already reserved cpu. */ |
| 510 | for_each_cpu_mask(cpu, cpu_mask) { |
| 511 | if (smp_cpu_reserved[cpu] != 0) { |
| 512 | smp_cpu_reserved[cpu]++; |
| 513 | /* Found one. */ |
| 514 | goto out; |
| 515 | } |
| 516 | } |
| 517 | /* Reserve a new cpu from cpu_mask. */ |
| 518 | for_each_cpu_mask(cpu, cpu_mask) { |
| 519 | if (cpu_online(cpu)) { |
| 520 | smp_cpu_reserved[cpu]++; |
| 521 | goto out; |
| 522 | } |
| 523 | } |
| 524 | cpu = -ENODEV; |
| 525 | out: |
| 526 | spin_unlock_irqrestore(&smp_reserve_lock, flags); |
| 527 | return cpu; |
| 528 | } |
| 529 | |
| 530 | void |
| 531 | smp_put_cpu(int cpu) |
| 532 | { |
| 533 | unsigned long flags; |
| 534 | |
| 535 | spin_lock_irqsave(&smp_reserve_lock, flags); |
| 536 | smp_cpu_reserved[cpu]--; |
| 537 | spin_unlock_irqrestore(&smp_reserve_lock, flags); |
| 538 | } |
| 539 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 540 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | cpu_stopped(int cpu) |
| 542 | { |
| 543 | __u32 status; |
| 544 | |
| 545 | /* Check for stopped state */ |
| 546 | if (signal_processor_ps(&status, 0, cpu, sigp_sense) == sigp_status_stored) { |
| 547 | if (status & 0x40) |
| 548 | return 1; |
| 549 | } |
| 550 | return 0; |
| 551 | } |
| 552 | |
| 553 | /* Upping and downing of CPUs */ |
| 554 | |
| 555 | int |
| 556 | __cpu_up(unsigned int cpu) |
| 557 | { |
| 558 | struct task_struct *idle; |
| 559 | struct _lowcore *cpu_lowcore; |
| 560 | struct stack_frame *sf; |
| 561 | sigp_ccode ccode; |
| 562 | int curr_cpu; |
| 563 | |
| 564 | for (curr_cpu = 0; curr_cpu <= 65535; curr_cpu++) { |
| 565 | __cpu_logical_map[cpu] = (__u16) curr_cpu; |
| 566 | if (cpu_stopped(cpu)) |
| 567 | break; |
| 568 | } |
| 569 | |
| 570 | if (!cpu_stopped(cpu)) |
| 571 | return -ENODEV; |
| 572 | |
| 573 | ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]), |
| 574 | cpu, sigp_set_prefix); |
| 575 | if (ccode){ |
| 576 | printk("sigp_set_prefix failed for cpu %d " |
| 577 | "with condition code %d\n", |
| 578 | (int) cpu, (int) ccode); |
| 579 | return -EIO; |
| 580 | } |
| 581 | |
| 582 | idle = current_set[cpu]; |
| 583 | cpu_lowcore = lowcore_ptr[cpu]; |
| 584 | cpu_lowcore->kernel_stack = (unsigned long) |
Al Viro | 30af712 | 2006-01-12 01:05:50 -0800 | [diff] [blame] | 585 | task_stack_page(idle) + (THREAD_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
| 587 | - sizeof(struct pt_regs) |
| 588 | - sizeof(struct stack_frame)); |
| 589 | memset(sf, 0, sizeof(struct stack_frame)); |
| 590 | sf->gprs[9] = (unsigned long) sf; |
| 591 | cpu_lowcore->save_area[15] = (unsigned long) sf; |
| 592 | __ctl_store(cpu_lowcore->cregs_save_area[0], 0, 15); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 593 | asm volatile( |
| 594 | " stam 0,15,0(%0)" |
| 595 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
| 597 | cpu_lowcore->current_task = (unsigned long) idle; |
| 598 | cpu_lowcore->cpu_data.cpu_nr = cpu; |
| 599 | eieio(); |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 600 | |
| 601 | while (signal_processor(cpu,sigp_restart) == sigp_busy) |
| 602 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | while (!cpu_online(cpu)) |
| 605 | cpu_relax(); |
| 606 | return 0; |
| 607 | } |
| 608 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 609 | static unsigned int __initdata additional_cpus; |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 610 | static unsigned int __initdata possible_cpus; |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 611 | |
| 612 | void __init smp_setup_cpu_possible_map(void) |
| 613 | { |
Heiko Carstens | 5433045 | 2006-02-17 13:52:48 -0800 | [diff] [blame] | 614 | unsigned int phy_cpus, pos_cpus, cpu; |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 615 | |
Heiko Carstens | 5433045 | 2006-02-17 13:52:48 -0800 | [diff] [blame] | 616 | phy_cpus = smp_count_cpus(); |
| 617 | pos_cpus = min(phy_cpus + additional_cpus, (unsigned int) NR_CPUS); |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 618 | |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 619 | if (possible_cpus) |
Heiko Carstens | 5433045 | 2006-02-17 13:52:48 -0800 | [diff] [blame] | 620 | pos_cpus = min(possible_cpus, (unsigned int) NR_CPUS); |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 621 | |
Heiko Carstens | 5433045 | 2006-02-17 13:52:48 -0800 | [diff] [blame] | 622 | for (cpu = 0; cpu < pos_cpus; cpu++) |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 623 | cpu_set(cpu, cpu_possible_map); |
| 624 | |
Heiko Carstens | 5433045 | 2006-02-17 13:52:48 -0800 | [diff] [blame] | 625 | phy_cpus = min(phy_cpus, pos_cpus); |
| 626 | |
| 627 | for (cpu = 0; cpu < phy_cpus; cpu++) |
| 628 | cpu_set(cpu, cpu_present_map); |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 629 | } |
| 630 | |
| 631 | #ifdef CONFIG_HOTPLUG_CPU |
| 632 | |
| 633 | static int __init setup_additional_cpus(char *s) |
| 634 | { |
| 635 | additional_cpus = simple_strtoul(s, NULL, 0); |
| 636 | return 0; |
| 637 | } |
| 638 | early_param("additional_cpus", setup_additional_cpus); |
| 639 | |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 640 | static int __init setup_possible_cpus(char *s) |
| 641 | { |
| 642 | possible_cpus = simple_strtoul(s, NULL, 0); |
| 643 | return 0; |
| 644 | } |
| 645 | early_param("possible_cpus", setup_possible_cpus); |
| 646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | int |
| 648 | __cpu_disable(void) |
| 649 | { |
| 650 | unsigned long flags; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 651 | struct ec_creg_mask_parms cr_parms; |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 652 | int cpu = smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
| 654 | spin_lock_irqsave(&smp_reserve_lock, flags); |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 655 | if (smp_cpu_reserved[cpu] != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | spin_unlock_irqrestore(&smp_reserve_lock, flags); |
| 657 | return -EBUSY; |
| 658 | } |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 659 | cpu_clear(cpu, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | /* Disable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 662 | pfault_fini(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 664 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
| 665 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 667 | /* disable all external interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | cr_parms.orvals[0] = 0; |
| 669 | cr_parms.andvals[0] = ~(1<<15 | 1<<14 | 1<<13 | 1<<12 | |
| 670 | 1<<11 | 1<<10 | 1<< 6 | 1<< 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | /* disable all I/O interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | cr_parms.orvals[6] = 0; |
| 673 | cr_parms.andvals[6] = ~(1<<31 | 1<<30 | 1<<29 | 1<<28 | |
| 674 | 1<<27 | 1<<26 | 1<<25 | 1<<24); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | /* disable most machine checks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | cr_parms.orvals[14] = 0; |
| 677 | cr_parms.andvals[14] = ~(1<<28 | 1<<27 | 1<<26 | 1<<25 | 1<<24); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | smp_ctl_bit_callback(&cr_parms); |
| 680 | |
| 681 | spin_unlock_irqrestore(&smp_reserve_lock, flags); |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | void |
| 686 | __cpu_die(unsigned int cpu) |
| 687 | { |
| 688 | /* Wait until target cpu is down */ |
| 689 | while (!smp_cpu_not_running(cpu)) |
| 690 | cpu_relax(); |
| 691 | printk("Processor %d spun down\n", cpu); |
| 692 | } |
| 693 | |
| 694 | void |
| 695 | cpu_die(void) |
| 696 | { |
| 697 | idle_task_exit(); |
| 698 | signal_processor(smp_processor_id(), sigp_stop); |
| 699 | BUG(); |
| 700 | for(;;); |
| 701 | } |
| 702 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 703 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | /* |
| 706 | * Cycle through the processors and setup structures. |
| 707 | */ |
| 708 | |
| 709 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 710 | { |
| 711 | unsigned long stack; |
| 712 | unsigned int cpu; |
| 713 | int i; |
| 714 | |
Heiko Carstens | 99b2d8d | 2005-07-27 11:45:00 -0700 | [diff] [blame] | 715 | /* request the 0x1201 emergency signal external interrupt */ |
| 716 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) |
| 717 | panic("Couldn't request external interrupt 0x1201"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | memset(lowcore_ptr,0,sizeof(lowcore_ptr)); |
| 719 | /* |
| 720 | * Initialize prefix pages and stacks for all possible cpus |
| 721 | */ |
| 722 | print_cpu_info(&S390_lowcore.cpu_data); |
| 723 | |
KAMEZAWA Hiroyuki | 97db7fb | 2006-03-31 02:30:26 -0800 | [diff] [blame] | 724 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | lowcore_ptr[i] = (struct _lowcore *) |
| 726 | __get_free_pages(GFP_KERNEL|GFP_DMA, |
| 727 | sizeof(void*) == 8 ? 1 : 0); |
| 728 | stack = __get_free_pages(GFP_KERNEL,ASYNC_ORDER); |
| 729 | if (lowcore_ptr[i] == NULL || stack == 0ULL) |
| 730 | panic("smp_boot_cpus failed to allocate memory\n"); |
| 731 | |
| 732 | *(lowcore_ptr[i]) = S390_lowcore; |
| 733 | lowcore_ptr[i]->async_stack = stack + (ASYNC_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | stack = __get_free_pages(GFP_KERNEL,0); |
| 735 | if (stack == 0ULL) |
| 736 | panic("smp_boot_cpus failed to allocate memory\n"); |
| 737 | lowcore_ptr[i]->panic_stack = stack + (PAGE_SIZE); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 738 | #ifndef CONFIG_64BIT |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 739 | if (MACHINE_HAS_IEEE) { |
| 740 | lowcore_ptr[i]->extended_save_area_addr = |
| 741 | (__u32) __get_free_pages(GFP_KERNEL,0); |
| 742 | if (lowcore_ptr[i]->extended_save_area_addr == 0) |
| 743 | panic("smp_boot_cpus failed to " |
| 744 | "allocate memory\n"); |
| 745 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | #endif |
| 747 | } |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 748 | #ifndef CONFIG_64BIT |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 749 | if (MACHINE_HAS_IEEE) |
| 750 | ctl_set_bit(14, 29); /* enable extended save area */ |
| 751 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | set_prefix((u32)(unsigned long) lowcore_ptr[smp_processor_id()]); |
| 753 | |
KAMEZAWA Hiroyuki | 97db7fb | 2006-03-31 02:30:26 -0800 | [diff] [blame] | 754 | for_each_possible_cpu(cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | if (cpu != smp_processor_id()) |
| 756 | smp_create_idle(cpu); |
| 757 | } |
| 758 | |
| 759 | void __devinit smp_prepare_boot_cpu(void) |
| 760 | { |
| 761 | BUG_ON(smp_processor_id() != 0); |
| 762 | |
| 763 | cpu_set(0, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
| 765 | current_set[0] = current; |
| 766 | } |
| 767 | |
| 768 | void smp_cpus_done(unsigned int max_cpus) |
| 769 | { |
Heiko Carstens | 5433045 | 2006-02-17 13:52:48 -0800 | [diff] [blame] | 770 | cpu_present_map = cpu_possible_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | /* |
| 774 | * the frequency of the profiling timer can be changed |
| 775 | * by writing a multiplier value into /proc/profile. |
| 776 | * |
| 777 | * usually you want to run this on all CPUs ;) |
| 778 | */ |
| 779 | int setup_profiling_timer(unsigned int multiplier) |
| 780 | { |
| 781 | return 0; |
| 782 | } |
| 783 | |
| 784 | static DEFINE_PER_CPU(struct cpu, cpu_devices); |
| 785 | |
| 786 | static int __init topology_init(void) |
| 787 | { |
| 788 | int cpu; |
| 789 | int ret; |
| 790 | |
KAMEZAWA Hiroyuki | 97db7fb | 2006-03-31 02:30:26 -0800 | [diff] [blame] | 791 | for_each_possible_cpu(cpu) { |
Heiko Carstens | 6721f77 | 2007-01-09 10:18:44 +0100 | [diff] [blame] | 792 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 793 | |
| 794 | c->hotpluggable = 1; |
| 795 | ret = register_cpu(c, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | if (ret) |
| 797 | printk(KERN_WARNING "topology_init: register_cpu %d " |
| 798 | "failed (%d)\n", cpu, ret); |
| 799 | } |
| 800 | return 0; |
| 801 | } |
| 802 | |
| 803 | subsys_initcall(topology_init); |
| 804 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 805 | EXPORT_SYMBOL(cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | EXPORT_SYMBOL(cpu_possible_map); |
| 807 | EXPORT_SYMBOL(lowcore_ptr); |
| 808 | EXPORT_SYMBOL(smp_ctl_set_bit); |
| 809 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
| 810 | EXPORT_SYMBOL(smp_call_function); |
| 811 | EXPORT_SYMBOL(smp_get_cpu); |
| 812 | EXPORT_SYMBOL(smp_put_cpu); |