Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/smp.c | |
3 | * | |
39ce010d | 4 | * Copyright IBM Corp. 1999,2007 |
1da177e4 | 5 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), |
39ce010d HC |
6 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
7 | * Heiko Carstens (heiko.carstens@de.ibm.com) | |
1da177e4 | 8 | * |
39ce010d | 9 | * based on other smp stuff by |
1da177e4 LT |
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> | |
1da177e4 | 25 | #include <linux/mm.h> |
4e950f6f | 26 | #include <linux/err.h> |
1da177e4 LT |
27 | #include <linux/spinlock.h> |
28 | #include <linux/kernel_stat.h> | |
1da177e4 LT |
29 | #include <linux/delay.h> |
30 | #include <linux/cache.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/cpu.h> | |
2b67fc46 | 33 | #include <linux/timex.h> |
411ed322 | 34 | #include <linux/bootmem.h> |
46b05d26 | 35 | #include <asm/ipl.h> |
2b67fc46 | 36 | #include <asm/setup.h> |
1da177e4 LT |
37 | #include <asm/sigp.h> |
38 | #include <asm/pgalloc.h> | |
39 | #include <asm/irq.h> | |
40 | #include <asm/s390_ext.h> | |
41 | #include <asm/cpcmd.h> | |
42 | #include <asm/tlbflush.h> | |
2b67fc46 | 43 | #include <asm/timer.h> |
411ed322 | 44 | #include <asm/lowcore.h> |
08d07968 | 45 | #include <asm/sclp.h> |
fae8b22d | 46 | #include <asm/cpu.h> |
1da177e4 | 47 | |
1da177e4 LT |
48 | /* |
49 | * An array with a pointer the lowcore of every CPU. | |
50 | */ | |
1da177e4 | 51 | struct _lowcore *lowcore_ptr[NR_CPUS]; |
39ce010d | 52 | EXPORT_SYMBOL(lowcore_ptr); |
1da177e4 | 53 | |
255acee7 | 54 | cpumask_t cpu_online_map = CPU_MASK_NONE; |
39ce010d HC |
55 | EXPORT_SYMBOL(cpu_online_map); |
56 | ||
48483b32 | 57 | cpumask_t cpu_possible_map = CPU_MASK_ALL; |
39ce010d | 58 | EXPORT_SYMBOL(cpu_possible_map); |
1da177e4 LT |
59 | |
60 | static struct task_struct *current_set[NR_CPUS]; | |
61 | ||
08d07968 HC |
62 | static u8 smp_cpu_type; |
63 | static int smp_use_sigp_detection; | |
64 | ||
65 | enum s390_cpu_state { | |
66 | CPU_STATE_STANDBY, | |
67 | CPU_STATE_CONFIGURED, | |
68 | }; | |
69 | ||
70 | #ifdef CONFIG_HOTPLUG_CPU | |
71 | static DEFINE_MUTEX(smp_cpu_state_mutex); | |
72 | #endif | |
73 | static int smp_cpu_state[NR_CPUS]; | |
74 | ||
75 | static DEFINE_PER_CPU(struct cpu, cpu_devices); | |
76 | DEFINE_PER_CPU(struct s390_idle_data, s390_idle); | |
77 | ||
1da177e4 | 78 | static void smp_ext_bitcall(int, ec_bit_sig); |
1da177e4 LT |
79 | |
80 | /* | |
63db6e8d JG |
81 | * Structure and data for __smp_call_function_map(). This is designed to |
82 | * minimise static memory requirements. It also looks cleaner. | |
1da177e4 LT |
83 | */ |
84 | static DEFINE_SPINLOCK(call_lock); | |
85 | ||
86 | struct call_data_struct { | |
87 | void (*func) (void *info); | |
88 | void *info; | |
63db6e8d JG |
89 | cpumask_t started; |
90 | cpumask_t finished; | |
1da177e4 LT |
91 | int wait; |
92 | }; | |
93 | ||
39ce010d | 94 | static struct call_data_struct *call_data; |
1da177e4 LT |
95 | |
96 | /* | |
97 | * 'Call function' interrupt callback | |
98 | */ | |
99 | static void do_call_function(void) | |
100 | { | |
101 | void (*func) (void *info) = call_data->func; | |
102 | void *info = call_data->info; | |
103 | int wait = call_data->wait; | |
104 | ||
63db6e8d | 105 | cpu_set(smp_processor_id(), call_data->started); |
1da177e4 LT |
106 | (*func)(info); |
107 | if (wait) | |
63db6e8d | 108 | cpu_set(smp_processor_id(), call_data->finished);; |
1da177e4 LT |
109 | } |
110 | ||
63db6e8d JG |
111 | static void __smp_call_function_map(void (*func) (void *info), void *info, |
112 | int nonatomic, int wait, cpumask_t map) | |
1da177e4 LT |
113 | { |
114 | struct call_data_struct data; | |
63db6e8d | 115 | int cpu, local = 0; |
1da177e4 | 116 | |
63db6e8d | 117 | /* |
25864162 | 118 | * Can deadlock when interrupts are disabled or if in wrong context. |
63db6e8d | 119 | */ |
25864162 | 120 | WARN_ON(irqs_disabled() || in_irq()); |
1da177e4 | 121 | |
63db6e8d JG |
122 | /* |
123 | * Check for local function call. We have to have the same call order | |
124 | * as in on_each_cpu() because of machine_restart_smp(). | |
125 | */ | |
126 | if (cpu_isset(smp_processor_id(), map)) { | |
127 | local = 1; | |
128 | cpu_clear(smp_processor_id(), map); | |
129 | } | |
130 | ||
131 | cpus_and(map, map, cpu_online_map); | |
132 | if (cpus_empty(map)) | |
133 | goto out; | |
1da177e4 LT |
134 | |
135 | data.func = func; | |
136 | data.info = info; | |
63db6e8d | 137 | data.started = CPU_MASK_NONE; |
1da177e4 LT |
138 | data.wait = wait; |
139 | if (wait) | |
63db6e8d | 140 | data.finished = CPU_MASK_NONE; |
1da177e4 | 141 | |
8da1aecd | 142 | spin_lock(&call_lock); |
1da177e4 | 143 | call_data = &data; |
63db6e8d JG |
144 | |
145 | for_each_cpu_mask(cpu, map) | |
146 | smp_ext_bitcall(cpu, ec_call_function); | |
1da177e4 LT |
147 | |
148 | /* Wait for response */ | |
63db6e8d | 149 | while (!cpus_equal(map, data.started)) |
1da177e4 | 150 | cpu_relax(); |
1da177e4 | 151 | if (wait) |
63db6e8d | 152 | while (!cpus_equal(map, data.finished)) |
1da177e4 | 153 | cpu_relax(); |
8da1aecd | 154 | spin_unlock(&call_lock); |
63db6e8d | 155 | out: |
8da1aecd HC |
156 | if (local) { |
157 | local_irq_disable(); | |
63db6e8d | 158 | func(info); |
8da1aecd HC |
159 | local_irq_enable(); |
160 | } | |
1da177e4 LT |
161 | } |
162 | ||
163 | /* | |
63db6e8d JG |
164 | * smp_call_function: |
165 | * @func: the function to run; this must be fast and non-blocking | |
166 | * @info: an arbitrary pointer to pass to the function | |
167 | * @nonatomic: unused | |
168 | * @wait: if true, wait (atomically) until function has completed on other CPUs | |
1da177e4 | 169 | * |
63db6e8d | 170 | * Run a function on all other CPUs. |
1da177e4 | 171 | * |
39ce010d HC |
172 | * You must not call this function with disabled interrupts, from a |
173 | * hardware interrupt handler or from a bottom half. | |
1da177e4 | 174 | */ |
63db6e8d JG |
175 | int smp_call_function(void (*func) (void *info), void *info, int nonatomic, |
176 | int wait) | |
1da177e4 | 177 | { |
63db6e8d | 178 | cpumask_t map; |
1da177e4 | 179 | |
25864162 | 180 | preempt_disable(); |
63db6e8d JG |
181 | map = cpu_online_map; |
182 | cpu_clear(smp_processor_id(), map); | |
183 | __smp_call_function_map(func, info, nonatomic, wait, map); | |
25864162 | 184 | preempt_enable(); |
63db6e8d JG |
185 | return 0; |
186 | } | |
187 | EXPORT_SYMBOL(smp_call_function); | |
1da177e4 | 188 | |
63db6e8d | 189 | /* |
3bb447fc HC |
190 | * smp_call_function_single: |
191 | * @cpu: the CPU where func should run | |
63db6e8d JG |
192 | * @func: the function to run; this must be fast and non-blocking |
193 | * @info: an arbitrary pointer to pass to the function | |
194 | * @nonatomic: unused | |
195 | * @wait: if true, wait (atomically) until function has completed on other CPUs | |
63db6e8d JG |
196 | * |
197 | * Run a function on one processor. | |
198 | * | |
39ce010d HC |
199 | * You must not call this function with disabled interrupts, from a |
200 | * hardware interrupt handler or from a bottom half. | |
63db6e8d | 201 | */ |
3bb447fc HC |
202 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, |
203 | int nonatomic, int wait) | |
63db6e8d | 204 | { |
25864162 | 205 | preempt_disable(); |
3bb447fc HC |
206 | __smp_call_function_map(func, info, nonatomic, wait, |
207 | cpumask_of_cpu(cpu)); | |
25864162 | 208 | preempt_enable(); |
1da177e4 LT |
209 | return 0; |
210 | } | |
3bb447fc | 211 | EXPORT_SYMBOL(smp_call_function_single); |
1da177e4 | 212 | |
677d7623 | 213 | void smp_send_stop(void) |
1da177e4 | 214 | { |
39ce010d | 215 | int cpu, rc; |
1da177e4 | 216 | |
677d7623 HC |
217 | /* Disable all interrupts/machine checks */ |
218 | __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); | |
1da177e4 | 219 | |
677d7623 HC |
220 | /* write magic number to zero page (absolute 0) */ |
221 | lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC; | |
1da177e4 | 222 | |
677d7623 | 223 | /* stop all processors */ |
1da177e4 LT |
224 | for_each_online_cpu(cpu) { |
225 | if (cpu == smp_processor_id()) | |
226 | continue; | |
227 | do { | |
677d7623 | 228 | rc = signal_processor(cpu, sigp_stop); |
39ce010d | 229 | } while (rc == sigp_busy); |
1da177e4 | 230 | |
39ce010d | 231 | while (!smp_cpu_not_running(cpu)) |
c6b5b847 HC |
232 | cpu_relax(); |
233 | } | |
234 | } | |
235 | ||
1da177e4 LT |
236 | /* |
237 | * This is the main routine where commands issued by other | |
238 | * cpus are handled. | |
239 | */ | |
240 | ||
2b67fc46 | 241 | static void do_ext_call_interrupt(__u16 code) |
1da177e4 | 242 | { |
39ce010d | 243 | unsigned long bits; |
1da177e4 | 244 | |
39ce010d HC |
245 | /* |
246 | * handle bit signal external calls | |
247 | * | |
248 | * For the ec_schedule signal we have to do nothing. All the work | |
249 | * is done automatically when we return from the interrupt. | |
250 | */ | |
1da177e4 LT |
251 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
252 | ||
39ce010d | 253 | if (test_bit(ec_call_function, &bits)) |
1da177e4 LT |
254 | do_call_function(); |
255 | } | |
256 | ||
257 | /* | |
258 | * Send an external call sigp to another cpu and return without waiting | |
259 | * for its completion. | |
260 | */ | |
261 | static void smp_ext_bitcall(int cpu, ec_bit_sig sig) | |
262 | { | |
39ce010d HC |
263 | /* |
264 | * Set signaling bit in lowcore of target cpu and kick it | |
265 | */ | |
1da177e4 | 266 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
39ce010d | 267 | while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) |
1da177e4 LT |
268 | udelay(10); |
269 | } | |
270 | ||
347a8dc3 | 271 | #ifndef CONFIG_64BIT |
1da177e4 LT |
272 | /* |
273 | * this function sends a 'purge tlb' signal to another CPU. | |
274 | */ | |
275 | void smp_ptlb_callback(void *info) | |
276 | { | |
ba8a9229 | 277 | __tlb_flush_local(); |
1da177e4 LT |
278 | } |
279 | ||
280 | void smp_ptlb_all(void) | |
281 | { | |
39ce010d | 282 | on_each_cpu(smp_ptlb_callback, NULL, 0, 1); |
1da177e4 LT |
283 | } |
284 | EXPORT_SYMBOL(smp_ptlb_all); | |
347a8dc3 | 285 | #endif /* ! CONFIG_64BIT */ |
1da177e4 LT |
286 | |
287 | /* | |
288 | * this function sends a 'reschedule' IPI to another CPU. | |
289 | * it goes straight through and wastes no time serializing | |
290 | * anything. Worst case is that we lose a reschedule ... | |
291 | */ | |
292 | void smp_send_reschedule(int cpu) | |
293 | { | |
39ce010d | 294 | smp_ext_bitcall(cpu, ec_schedule); |
1da177e4 LT |
295 | } |
296 | ||
297 | /* | |
298 | * parameter area for the set/clear control bit callbacks | |
299 | */ | |
94c12cc7 | 300 | struct ec_creg_mask_parms { |
1da177e4 LT |
301 | unsigned long orvals[16]; |
302 | unsigned long andvals[16]; | |
94c12cc7 | 303 | }; |
1da177e4 LT |
304 | |
305 | /* | |
306 | * callback for setting/clearing control bits | |
307 | */ | |
39ce010d HC |
308 | static void smp_ctl_bit_callback(void *info) |
309 | { | |
94c12cc7 | 310 | struct ec_creg_mask_parms *pp = info; |
1da177e4 LT |
311 | unsigned long cregs[16]; |
312 | int i; | |
39ce010d | 313 | |
94c12cc7 MS |
314 | __ctl_store(cregs, 0, 15); |
315 | for (i = 0; i <= 15; i++) | |
1da177e4 | 316 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
94c12cc7 | 317 | __ctl_load(cregs, 0, 15); |
1da177e4 LT |
318 | } |
319 | ||
320 | /* | |
321 | * Set a bit in a control register of all cpus | |
322 | */ | |
94c12cc7 MS |
323 | void smp_ctl_set_bit(int cr, int bit) |
324 | { | |
325 | struct ec_creg_mask_parms parms; | |
1da177e4 | 326 | |
94c12cc7 MS |
327 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
328 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); | |
1da177e4 | 329 | parms.orvals[cr] = 1 << bit; |
94c12cc7 | 330 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
1da177e4 | 331 | } |
39ce010d | 332 | EXPORT_SYMBOL(smp_ctl_set_bit); |
1da177e4 LT |
333 | |
334 | /* | |
335 | * Clear a bit in a control register of all cpus | |
336 | */ | |
94c12cc7 MS |
337 | void smp_ctl_clear_bit(int cr, int bit) |
338 | { | |
339 | struct ec_creg_mask_parms parms; | |
1da177e4 | 340 | |
94c12cc7 MS |
341 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
342 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); | |
1da177e4 | 343 | parms.andvals[cr] = ~(1L << bit); |
94c12cc7 | 344 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
1da177e4 | 345 | } |
39ce010d | 346 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
1da177e4 | 347 | |
08d07968 HC |
348 | /* |
349 | * In early ipl state a temp. logically cpu number is needed, so the sigp | |
350 | * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on | |
351 | * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1. | |
352 | */ | |
353 | #define CPU_INIT_NO 1 | |
354 | ||
411ed322 MH |
355 | #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) |
356 | ||
357 | /* | |
358 | * zfcpdump_prefix_array holds prefix registers for the following scenario: | |
359 | * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to | |
360 | * save its prefix registers, since they get lost, when switching from 31 bit | |
361 | * to 64 bit. | |
362 | */ | |
363 | unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \ | |
364 | __attribute__((__section__(".data"))); | |
365 | ||
285f6722 | 366 | static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) |
411ed322 | 367 | { |
411ed322 MH |
368 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
369 | return; | |
285f6722 HC |
370 | if (cpu >= NR_CPUS) { |
371 | printk(KERN_WARNING "Registers for cpu %i not saved since dump " | |
372 | "kernel was compiled with NR_CPUS=%i\n", cpu, NR_CPUS); | |
373 | return; | |
411ed322 | 374 | } |
48483b32 | 375 | zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL); |
08d07968 HC |
376 | __cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu; |
377 | while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) == | |
378 | sigp_busy) | |
285f6722 HC |
379 | cpu_relax(); |
380 | memcpy(zfcpdump_save_areas[cpu], | |
381 | (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, | |
382 | SAVE_AREA_SIZE); | |
383 | #ifdef CONFIG_64BIT | |
384 | /* copy original prefix register */ | |
385 | zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu]; | |
386 | #endif | |
411ed322 MH |
387 | } |
388 | ||
389 | union save_area *zfcpdump_save_areas[NR_CPUS + 1]; | |
390 | EXPORT_SYMBOL_GPL(zfcpdump_save_areas); | |
391 | ||
392 | #else | |
285f6722 HC |
393 | |
394 | static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } | |
395 | ||
396 | #endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */ | |
411ed322 | 397 | |
08d07968 HC |
398 | static int cpu_stopped(int cpu) |
399 | { | |
400 | __u32 status; | |
401 | ||
402 | /* Check for stopped state */ | |
403 | if (signal_processor_ps(&status, 0, cpu, sigp_sense) == | |
404 | sigp_status_stored) { | |
405 | if (status & 0x40) | |
406 | return 1; | |
407 | } | |
408 | return 0; | |
409 | } | |
410 | ||
08d07968 HC |
411 | static int cpu_known(int cpu_id) |
412 | { | |
413 | int cpu; | |
414 | ||
415 | for_each_present_cpu(cpu) { | |
416 | if (__cpu_logical_map[cpu] == cpu_id) | |
417 | return 1; | |
418 | } | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static int smp_rescan_cpus_sigp(cpumask_t avail) | |
423 | { | |
424 | int cpu_id, logical_cpu; | |
425 | ||
426 | logical_cpu = first_cpu(avail); | |
427 | if (logical_cpu == NR_CPUS) | |
428 | return 0; | |
429 | for (cpu_id = 0; cpu_id <= 65535; cpu_id++) { | |
430 | if (cpu_known(cpu_id)) | |
431 | continue; | |
432 | __cpu_logical_map[logical_cpu] = cpu_id; | |
433 | if (!cpu_stopped(logical_cpu)) | |
434 | continue; | |
435 | cpu_set(logical_cpu, cpu_present_map); | |
436 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; | |
437 | logical_cpu = next_cpu(logical_cpu, avail); | |
438 | if (logical_cpu == NR_CPUS) | |
439 | break; | |
440 | } | |
441 | return 0; | |
442 | } | |
443 | ||
48483b32 | 444 | static int smp_rescan_cpus_sclp(cpumask_t avail) |
08d07968 HC |
445 | { |
446 | struct sclp_cpu_info *info; | |
447 | int cpu_id, logical_cpu, cpu; | |
448 | int rc; | |
449 | ||
450 | logical_cpu = first_cpu(avail); | |
451 | if (logical_cpu == NR_CPUS) | |
452 | return 0; | |
48483b32 | 453 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
08d07968 HC |
454 | if (!info) |
455 | return -ENOMEM; | |
456 | rc = sclp_get_cpu_info(info); | |
457 | if (rc) | |
458 | goto out; | |
459 | for (cpu = 0; cpu < info->combined; cpu++) { | |
460 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) | |
461 | continue; | |
462 | cpu_id = info->cpu[cpu].address; | |
463 | if (cpu_known(cpu_id)) | |
464 | continue; | |
465 | __cpu_logical_map[logical_cpu] = cpu_id; | |
466 | cpu_set(logical_cpu, cpu_present_map); | |
467 | if (cpu >= info->configured) | |
468 | smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; | |
469 | else | |
470 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; | |
471 | logical_cpu = next_cpu(logical_cpu, avail); | |
472 | if (logical_cpu == NR_CPUS) | |
473 | break; | |
474 | } | |
475 | out: | |
48483b32 | 476 | kfree(info); |
08d07968 HC |
477 | return rc; |
478 | } | |
479 | ||
480 | static int smp_rescan_cpus(void) | |
481 | { | |
482 | cpumask_t avail; | |
483 | ||
48483b32 | 484 | cpus_xor(avail, cpu_possible_map, cpu_present_map); |
08d07968 HC |
485 | if (smp_use_sigp_detection) |
486 | return smp_rescan_cpus_sigp(avail); | |
487 | else | |
488 | return smp_rescan_cpus_sclp(avail); | |
1da177e4 LT |
489 | } |
490 | ||
48483b32 HC |
491 | static void __init smp_detect_cpus(void) |
492 | { | |
493 | unsigned int cpu, c_cpus, s_cpus; | |
494 | struct sclp_cpu_info *info; | |
495 | u16 boot_cpu_addr, cpu_addr; | |
496 | ||
497 | c_cpus = 1; | |
498 | s_cpus = 0; | |
499 | boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr; | |
500 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
501 | if (!info) | |
502 | panic("smp_detect_cpus failed to allocate memory\n"); | |
503 | /* Use sigp detection algorithm if sclp doesn't work. */ | |
504 | if (sclp_get_cpu_info(info)) { | |
505 | smp_use_sigp_detection = 1; | |
506 | for (cpu = 0; cpu <= 65535; cpu++) { | |
507 | if (cpu == boot_cpu_addr) | |
508 | continue; | |
509 | __cpu_logical_map[CPU_INIT_NO] = cpu; | |
510 | if (!cpu_stopped(CPU_INIT_NO)) | |
511 | continue; | |
512 | smp_get_save_area(c_cpus, cpu); | |
513 | c_cpus++; | |
514 | } | |
515 | goto out; | |
516 | } | |
517 | ||
518 | if (info->has_cpu_type) { | |
519 | for (cpu = 0; cpu < info->combined; cpu++) { | |
520 | if (info->cpu[cpu].address == boot_cpu_addr) { | |
521 | smp_cpu_type = info->cpu[cpu].type; | |
522 | break; | |
523 | } | |
524 | } | |
525 | } | |
526 | ||
527 | for (cpu = 0; cpu < info->combined; cpu++) { | |
528 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) | |
529 | continue; | |
530 | cpu_addr = info->cpu[cpu].address; | |
531 | if (cpu_addr == boot_cpu_addr) | |
532 | continue; | |
533 | __cpu_logical_map[CPU_INIT_NO] = cpu_addr; | |
534 | if (!cpu_stopped(CPU_INIT_NO)) { | |
535 | s_cpus++; | |
536 | continue; | |
537 | } | |
538 | smp_get_save_area(c_cpus, cpu_addr); | |
539 | c_cpus++; | |
540 | } | |
541 | out: | |
542 | kfree(info); | |
543 | printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus); | |
544 | lock_cpu_hotplug(); | |
545 | smp_rescan_cpus(); | |
546 | unlock_cpu_hotplug(); | |
547 | } | |
548 | ||
1da177e4 | 549 | /* |
39ce010d | 550 | * Activate a secondary processor. |
1da177e4 | 551 | */ |
ea1f4eec | 552 | int __cpuinit start_secondary(void *cpuvoid) |
1da177e4 | 553 | { |
39ce010d HC |
554 | /* Setup the cpu */ |
555 | cpu_init(); | |
5bfb5d69 | 556 | preempt_disable(); |
d54853ef | 557 | /* Enable TOD clock interrupts on the secondary cpu. */ |
39ce010d | 558 | init_cpu_timer(); |
1da177e4 | 559 | #ifdef CONFIG_VIRT_TIMER |
d54853ef | 560 | /* Enable cpu timer interrupts on the secondary cpu. */ |
39ce010d | 561 | init_cpu_vtimer(); |
1da177e4 | 562 | #endif |
1da177e4 | 563 | /* Enable pfault pseudo page faults on this cpu. */ |
29b08d2b HC |
564 | pfault_init(); |
565 | ||
1da177e4 LT |
566 | /* Mark this cpu as online */ |
567 | cpu_set(smp_processor_id(), cpu_online_map); | |
568 | /* Switch on interrupts */ | |
569 | local_irq_enable(); | |
39ce010d HC |
570 | /* Print info about this processor */ |
571 | print_cpu_info(&S390_lowcore.cpu_data); | |
572 | /* cpu_idle will call schedule for us */ | |
573 | cpu_idle(); | |
574 | return 0; | |
1da177e4 LT |
575 | } |
576 | ||
577 | static void __init smp_create_idle(unsigned int cpu) | |
578 | { | |
579 | struct task_struct *p; | |
580 | ||
581 | /* | |
582 | * don't care about the psw and regs settings since we'll never | |
583 | * reschedule the forked task. | |
584 | */ | |
585 | p = fork_idle(cpu); | |
586 | if (IS_ERR(p)) | |
587 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); | |
588 | current_set[cpu] = p; | |
fae8b22d | 589 | spin_lock_init(&(&per_cpu(s390_idle, cpu))->lock); |
1da177e4 LT |
590 | } |
591 | ||
1da177e4 | 592 | /* Upping and downing of CPUs */ |
39ce010d | 593 | int __cpu_up(unsigned int cpu) |
1da177e4 LT |
594 | { |
595 | struct task_struct *idle; | |
39ce010d | 596 | struct _lowcore *cpu_lowcore; |
1da177e4 | 597 | struct stack_frame *sf; |
39ce010d | 598 | sigp_ccode ccode; |
1da177e4 | 599 | |
08d07968 HC |
600 | if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) |
601 | return -EIO; | |
1da177e4 LT |
602 | |
603 | ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]), | |
604 | cpu, sigp_set_prefix); | |
39ce010d | 605 | if (ccode) { |
1da177e4 LT |
606 | printk("sigp_set_prefix failed for cpu %d " |
607 | "with condition code %d\n", | |
608 | (int) cpu, (int) ccode); | |
609 | return -EIO; | |
610 | } | |
611 | ||
612 | idle = current_set[cpu]; | |
39ce010d | 613 | cpu_lowcore = lowcore_ptr[cpu]; |
1da177e4 | 614 | cpu_lowcore->kernel_stack = (unsigned long) |
39ce010d | 615 | task_stack_page(idle) + THREAD_SIZE; |
1da177e4 LT |
616 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
617 | - sizeof(struct pt_regs) | |
618 | - sizeof(struct stack_frame)); | |
619 | memset(sf, 0, sizeof(struct stack_frame)); | |
620 | sf->gprs[9] = (unsigned long) sf; | |
621 | cpu_lowcore->save_area[15] = (unsigned long) sf; | |
622 | __ctl_store(cpu_lowcore->cregs_save_area[0], 0, 15); | |
94c12cc7 MS |
623 | asm volatile( |
624 | " stam 0,15,0(%0)" | |
625 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); | |
1da177e4 | 626 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
39ce010d HC |
627 | cpu_lowcore->current_task = (unsigned long) idle; |
628 | cpu_lowcore->cpu_data.cpu_nr = cpu; | |
1da177e4 | 629 | eieio(); |
699ff13f | 630 | |
39ce010d | 631 | while (signal_processor(cpu, sigp_restart) == sigp_busy) |
699ff13f | 632 | udelay(10); |
1da177e4 LT |
633 | |
634 | while (!cpu_online(cpu)) | |
635 | cpu_relax(); | |
636 | return 0; | |
637 | } | |
638 | ||
48483b32 | 639 | static int __init setup_possible_cpus(char *s) |
255acee7 | 640 | { |
48483b32 | 641 | int pcpus, cpu; |
255acee7 | 642 | |
48483b32 HC |
643 | pcpus = simple_strtoul(s, NULL, 0); |
644 | cpu_possible_map = cpumask_of_cpu(0); | |
645 | for (cpu = 1; cpu < pcpus && cpu < NR_CPUS; cpu++) | |
255acee7 | 646 | cpu_set(cpu, cpu_possible_map); |
37a33026 HC |
647 | return 0; |
648 | } | |
649 | early_param("possible_cpus", setup_possible_cpus); | |
650 | ||
48483b32 HC |
651 | #ifdef CONFIG_HOTPLUG_CPU |
652 | ||
39ce010d | 653 | int __cpu_disable(void) |
1da177e4 | 654 | { |
94c12cc7 | 655 | struct ec_creg_mask_parms cr_parms; |
f3705136 | 656 | int cpu = smp_processor_id(); |
1da177e4 | 657 | |
f3705136 | 658 | cpu_clear(cpu, cpu_online_map); |
1da177e4 | 659 | |
1da177e4 | 660 | /* Disable pfault pseudo page faults on this cpu. */ |
29b08d2b | 661 | pfault_fini(); |
1da177e4 | 662 | |
94c12cc7 MS |
663 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
664 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); | |
1da177e4 | 665 | |
94c12cc7 | 666 | /* disable all external interrupts */ |
1da177e4 | 667 | cr_parms.orvals[0] = 0; |
39ce010d HC |
668 | cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 | |
669 | 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4); | |
1da177e4 | 670 | /* disable all I/O interrupts */ |
1da177e4 | 671 | cr_parms.orvals[6] = 0; |
39ce010d HC |
672 | cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | |
673 | 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); | |
1da177e4 | 674 | /* disable most machine checks */ |
1da177e4 | 675 | cr_parms.orvals[14] = 0; |
39ce010d HC |
676 | cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | |
677 | 1 << 25 | 1 << 24); | |
94c12cc7 | 678 | |
1da177e4 LT |
679 | smp_ctl_bit_callback(&cr_parms); |
680 | ||
1da177e4 LT |
681 | return 0; |
682 | } | |
683 | ||
39ce010d | 684 | void __cpu_die(unsigned int cpu) |
1da177e4 LT |
685 | { |
686 | /* Wait until target cpu is down */ | |
687 | while (!smp_cpu_not_running(cpu)) | |
688 | cpu_relax(); | |
08d07968 | 689 | printk(KERN_INFO "Processor %d spun down\n", cpu); |
1da177e4 LT |
690 | } |
691 | ||
39ce010d | 692 | void cpu_die(void) |
1da177e4 LT |
693 | { |
694 | idle_task_exit(); | |
695 | signal_processor(smp_processor_id(), sigp_stop); | |
696 | BUG(); | |
39ce010d | 697 | for (;;); |
1da177e4 LT |
698 | } |
699 | ||
255acee7 HC |
700 | #endif /* CONFIG_HOTPLUG_CPU */ |
701 | ||
1da177e4 LT |
702 | /* |
703 | * Cycle through the processors and setup structures. | |
704 | */ | |
705 | ||
706 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
707 | { | |
708 | unsigned long stack; | |
709 | unsigned int cpu; | |
39ce010d HC |
710 | int i; |
711 | ||
48483b32 HC |
712 | smp_detect_cpus(); |
713 | ||
39ce010d HC |
714 | /* request the 0x1201 emergency signal external interrupt */ |
715 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) | |
716 | panic("Couldn't request external interrupt 0x1201"); | |
717 | memset(lowcore_ptr, 0, sizeof(lowcore_ptr)); | |
718 | /* | |
719 | * Initialize prefix pages and stacks for all possible cpus | |
720 | */ | |
1da177e4 LT |
721 | print_cpu_info(&S390_lowcore.cpu_data); |
722 | ||
39ce010d | 723 | for_each_possible_cpu(i) { |
1da177e4 | 724 | lowcore_ptr[i] = (struct _lowcore *) |
39ce010d HC |
725 | __get_free_pages(GFP_KERNEL | GFP_DMA, |
726 | sizeof(void*) == 8 ? 1 : 0); | |
727 | stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); | |
728 | if (!lowcore_ptr[i] || !stack) | |
1da177e4 LT |
729 | panic("smp_boot_cpus failed to allocate memory\n"); |
730 | ||
731 | *(lowcore_ptr[i]) = S390_lowcore; | |
39ce010d HC |
732 | lowcore_ptr[i]->async_stack = stack + ASYNC_SIZE; |
733 | stack = __get_free_pages(GFP_KERNEL, 0); | |
734 | if (!stack) | |
1da177e4 | 735 | panic("smp_boot_cpus failed to allocate memory\n"); |
39ce010d | 736 | lowcore_ptr[i]->panic_stack = stack + PAGE_SIZE; |
347a8dc3 | 737 | #ifndef CONFIG_64BIT |
77fa2245 HC |
738 | if (MACHINE_HAS_IEEE) { |
739 | lowcore_ptr[i]->extended_save_area_addr = | |
39ce010d HC |
740 | (__u32) __get_free_pages(GFP_KERNEL, 0); |
741 | if (!lowcore_ptr[i]->extended_save_area_addr) | |
77fa2245 HC |
742 | panic("smp_boot_cpus failed to " |
743 | "allocate memory\n"); | |
744 | } | |
1da177e4 LT |
745 | #endif |
746 | } | |
347a8dc3 | 747 | #ifndef CONFIG_64BIT |
77fa2245 HC |
748 | if (MACHINE_HAS_IEEE) |
749 | ctl_set_bit(14, 29); /* enable extended save area */ | |
750 | #endif | |
1da177e4 LT |
751 | set_prefix((u32)(unsigned long) lowcore_ptr[smp_processor_id()]); |
752 | ||
97db7fbf | 753 | for_each_possible_cpu(cpu) |
1da177e4 LT |
754 | if (cpu != smp_processor_id()) |
755 | smp_create_idle(cpu); | |
756 | } | |
757 | ||
ea1f4eec | 758 | void __init smp_prepare_boot_cpu(void) |
1da177e4 LT |
759 | { |
760 | BUG_ON(smp_processor_id() != 0); | |
761 | ||
48483b32 HC |
762 | current_thread_info()->cpu = 0; |
763 | cpu_set(0, cpu_present_map); | |
1da177e4 | 764 | cpu_set(0, cpu_online_map); |
1da177e4 LT |
765 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
766 | current_set[0] = current; | |
08d07968 | 767 | smp_cpu_state[0] = CPU_STATE_CONFIGURED; |
fae8b22d | 768 | spin_lock_init(&(&__get_cpu_var(s390_idle))->lock); |
1da177e4 LT |
769 | } |
770 | ||
ea1f4eec | 771 | void __init smp_cpus_done(unsigned int max_cpus) |
1da177e4 | 772 | { |
1da177e4 LT |
773 | } |
774 | ||
775 | /* | |
776 | * the frequency of the profiling timer can be changed | |
777 | * by writing a multiplier value into /proc/profile. | |
778 | * | |
779 | * usually you want to run this on all CPUs ;) | |
780 | */ | |
781 | int setup_profiling_timer(unsigned int multiplier) | |
782 | { | |
39ce010d | 783 | return 0; |
1da177e4 LT |
784 | } |
785 | ||
08d07968 HC |
786 | #ifdef CONFIG_HOTPLUG_CPU |
787 | static ssize_t cpu_configure_show(struct sys_device *dev, char *buf) | |
788 | { | |
789 | ssize_t count; | |
790 | ||
791 | mutex_lock(&smp_cpu_state_mutex); | |
792 | count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); | |
793 | mutex_unlock(&smp_cpu_state_mutex); | |
794 | return count; | |
795 | } | |
796 | ||
797 | static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf, | |
798 | size_t count) | |
799 | { | |
800 | int cpu = dev->id; | |
801 | int val, rc; | |
802 | char delim; | |
803 | ||
804 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
805 | return -EINVAL; | |
806 | if (val != 0 && val != 1) | |
807 | return -EINVAL; | |
808 | ||
809 | mutex_lock(&smp_cpu_state_mutex); | |
810 | lock_cpu_hotplug(); | |
811 | rc = -EBUSY; | |
812 | if (cpu_online(cpu)) | |
813 | goto out; | |
814 | rc = 0; | |
815 | switch (val) { | |
816 | case 0: | |
817 | if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { | |
818 | rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); | |
819 | if (!rc) | |
820 | smp_cpu_state[cpu] = CPU_STATE_STANDBY; | |
821 | } | |
822 | break; | |
823 | case 1: | |
824 | if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { | |
825 | rc = sclp_cpu_configure(__cpu_logical_map[cpu]); | |
826 | if (!rc) | |
827 | smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; | |
828 | } | |
829 | break; | |
830 | default: | |
831 | break; | |
832 | } | |
833 | out: | |
834 | unlock_cpu_hotplug(); | |
835 | mutex_unlock(&smp_cpu_state_mutex); | |
836 | return rc ? rc : count; | |
837 | } | |
838 | static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); | |
839 | #endif /* CONFIG_HOTPLUG_CPU */ | |
840 | ||
841 | static ssize_t show_cpu_address(struct sys_device *dev, char *buf) | |
842 | { | |
843 | return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); | |
844 | } | |
845 | static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL); | |
846 | ||
847 | ||
848 | static struct attribute *cpu_common_attrs[] = { | |
849 | #ifdef CONFIG_HOTPLUG_CPU | |
850 | &attr_configure.attr, | |
851 | #endif | |
852 | &attr_address.attr, | |
853 | NULL, | |
854 | }; | |
855 | ||
856 | static struct attribute_group cpu_common_attr_group = { | |
857 | .attrs = cpu_common_attrs, | |
858 | }; | |
1da177e4 | 859 | |
2fc2d1e9 HC |
860 | static ssize_t show_capability(struct sys_device *dev, char *buf) |
861 | { | |
862 | unsigned int capability; | |
863 | int rc; | |
864 | ||
865 | rc = get_cpu_capability(&capability); | |
866 | if (rc) | |
867 | return rc; | |
868 | return sprintf(buf, "%u\n", capability); | |
869 | } | |
870 | static SYSDEV_ATTR(capability, 0444, show_capability, NULL); | |
871 | ||
fae8b22d HC |
872 | static ssize_t show_idle_count(struct sys_device *dev, char *buf) |
873 | { | |
874 | struct s390_idle_data *idle; | |
875 | unsigned long long idle_count; | |
876 | ||
877 | idle = &per_cpu(s390_idle, dev->id); | |
878 | spin_lock_irq(&idle->lock); | |
879 | idle_count = idle->idle_count; | |
880 | spin_unlock_irq(&idle->lock); | |
881 | return sprintf(buf, "%llu\n", idle_count); | |
882 | } | |
883 | static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); | |
884 | ||
885 | static ssize_t show_idle_time(struct sys_device *dev, char *buf) | |
886 | { | |
887 | struct s390_idle_data *idle; | |
888 | unsigned long long new_time; | |
889 | ||
890 | idle = &per_cpu(s390_idle, dev->id); | |
891 | spin_lock_irq(&idle->lock); | |
892 | if (idle->in_idle) { | |
893 | new_time = get_clock(); | |
894 | idle->idle_time += new_time - idle->idle_enter; | |
895 | idle->idle_enter = new_time; | |
896 | } | |
897 | new_time = idle->idle_time; | |
898 | spin_unlock_irq(&idle->lock); | |
69d39d66 | 899 | return sprintf(buf, "%llu\n", new_time >> 12); |
fae8b22d | 900 | } |
69d39d66 | 901 | static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); |
fae8b22d | 902 | |
08d07968 | 903 | static struct attribute *cpu_online_attrs[] = { |
fae8b22d HC |
904 | &attr_capability.attr, |
905 | &attr_idle_count.attr, | |
69d39d66 | 906 | &attr_idle_time_us.attr, |
fae8b22d HC |
907 | NULL, |
908 | }; | |
909 | ||
08d07968 HC |
910 | static struct attribute_group cpu_online_attr_group = { |
911 | .attrs = cpu_online_attrs, | |
fae8b22d HC |
912 | }; |
913 | ||
2fc2d1e9 HC |
914 | static int __cpuinit smp_cpu_notify(struct notifier_block *self, |
915 | unsigned long action, void *hcpu) | |
916 | { | |
917 | unsigned int cpu = (unsigned int)(long)hcpu; | |
918 | struct cpu *c = &per_cpu(cpu_devices, cpu); | |
919 | struct sys_device *s = &c->sysdev; | |
fae8b22d | 920 | struct s390_idle_data *idle; |
2fc2d1e9 HC |
921 | |
922 | switch (action) { | |
923 | case CPU_ONLINE: | |
8bb78442 | 924 | case CPU_ONLINE_FROZEN: |
fae8b22d HC |
925 | idle = &per_cpu(s390_idle, cpu); |
926 | spin_lock_irq(&idle->lock); | |
927 | idle->idle_enter = 0; | |
928 | idle->idle_time = 0; | |
929 | idle->idle_count = 0; | |
930 | spin_unlock_irq(&idle->lock); | |
08d07968 | 931 | if (sysfs_create_group(&s->kobj, &cpu_online_attr_group)) |
2fc2d1e9 HC |
932 | return NOTIFY_BAD; |
933 | break; | |
934 | case CPU_DEAD: | |
8bb78442 | 935 | case CPU_DEAD_FROZEN: |
08d07968 | 936 | sysfs_remove_group(&s->kobj, &cpu_online_attr_group); |
2fc2d1e9 HC |
937 | break; |
938 | } | |
939 | return NOTIFY_OK; | |
940 | } | |
941 | ||
942 | static struct notifier_block __cpuinitdata smp_cpu_nb = { | |
39ce010d | 943 | .notifier_call = smp_cpu_notify, |
2fc2d1e9 HC |
944 | }; |
945 | ||
08d07968 HC |
946 | static int smp_add_present_cpu(int cpu) |
947 | { | |
948 | struct cpu *c = &per_cpu(cpu_devices, cpu); | |
949 | struct sys_device *s = &c->sysdev; | |
950 | int rc; | |
951 | ||
952 | c->hotpluggable = 1; | |
953 | rc = register_cpu(c, cpu); | |
954 | if (rc) | |
955 | goto out; | |
956 | rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group); | |
957 | if (rc) | |
958 | goto out_cpu; | |
959 | if (!cpu_online(cpu)) | |
960 | goto out; | |
961 | rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); | |
962 | if (!rc) | |
963 | return 0; | |
964 | sysfs_remove_group(&s->kobj, &cpu_common_attr_group); | |
965 | out_cpu: | |
966 | #ifdef CONFIG_HOTPLUG_CPU | |
967 | unregister_cpu(c); | |
968 | #endif | |
969 | out: | |
970 | return rc; | |
971 | } | |
972 | ||
973 | #ifdef CONFIG_HOTPLUG_CPU | |
974 | static ssize_t rescan_store(struct sys_device *dev, const char *buf, | |
975 | size_t count) | |
976 | { | |
977 | cpumask_t newcpus; | |
978 | int cpu; | |
979 | int rc; | |
980 | ||
981 | mutex_lock(&smp_cpu_state_mutex); | |
982 | lock_cpu_hotplug(); | |
983 | newcpus = cpu_present_map; | |
984 | rc = smp_rescan_cpus(); | |
985 | if (rc) | |
986 | goto out; | |
987 | cpus_andnot(newcpus, cpu_present_map, newcpus); | |
988 | for_each_cpu_mask(cpu, newcpus) { | |
989 | rc = smp_add_present_cpu(cpu); | |
990 | if (rc) | |
991 | cpu_clear(cpu, cpu_present_map); | |
992 | } | |
993 | rc = 0; | |
994 | out: | |
995 | unlock_cpu_hotplug(); | |
996 | mutex_unlock(&smp_cpu_state_mutex); | |
997 | return rc ? rc : count; | |
998 | } | |
999 | static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store); | |
1000 | #endif /* CONFIG_HOTPLUG_CPU */ | |
1001 | ||
1da177e4 LT |
1002 | static int __init topology_init(void) |
1003 | { | |
1004 | int cpu; | |
fae8b22d | 1005 | int rc; |
2fc2d1e9 HC |
1006 | |
1007 | register_cpu_notifier(&smp_cpu_nb); | |
1da177e4 | 1008 | |
08d07968 HC |
1009 | #ifdef CONFIG_HOTPLUG_CPU |
1010 | rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj, | |
1011 | &attr_rescan.attr); | |
1012 | if (rc) | |
1013 | return rc; | |
1014 | #endif | |
1015 | for_each_present_cpu(cpu) { | |
1016 | rc = smp_add_present_cpu(cpu); | |
fae8b22d HC |
1017 | if (rc) |
1018 | return rc; | |
1da177e4 LT |
1019 | } |
1020 | return 0; | |
1021 | } | |
1da177e4 | 1022 | subsys_initcall(topology_init); |