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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 | |
dab5209c CO |
213 | /** |
214 | * smp_call_function_mask(): Run a function on a set of other CPUs. | |
215 | * @mask: The set of cpus to run on. Must not include the current cpu. | |
216 | * @func: The function to run. This must be fast and non-blocking. | |
217 | * @info: An arbitrary pointer to pass to the function. | |
218 | * @wait: If true, wait (atomically) until function has completed on other CPUs. | |
219 | * | |
220 | * Returns 0 on success, else a negative status code. | |
221 | * | |
222 | * If @wait is true, then returns once @func has returned; otherwise | |
223 | * it returns just before the target cpu calls @func. | |
224 | * | |
225 | * You must not call this function with disabled interrupts or from a | |
226 | * hardware interrupt handler or from a bottom half handler. | |
227 | */ | |
37c5f719 HC |
228 | int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info, |
229 | int wait) | |
dab5209c CO |
230 | { |
231 | preempt_disable(); | |
37c5f719 | 232 | cpu_clear(smp_processor_id(), mask); |
dab5209c CO |
233 | __smp_call_function_map(func, info, 0, wait, mask); |
234 | preempt_enable(); | |
235 | return 0; | |
236 | } | |
237 | EXPORT_SYMBOL(smp_call_function_mask); | |
238 | ||
677d7623 | 239 | void smp_send_stop(void) |
1da177e4 | 240 | { |
39ce010d | 241 | int cpu, rc; |
1da177e4 | 242 | |
677d7623 HC |
243 | /* Disable all interrupts/machine checks */ |
244 | __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); | |
1da177e4 | 245 | |
677d7623 HC |
246 | /* write magic number to zero page (absolute 0) */ |
247 | lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC; | |
1da177e4 | 248 | |
677d7623 | 249 | /* stop all processors */ |
1da177e4 LT |
250 | for_each_online_cpu(cpu) { |
251 | if (cpu == smp_processor_id()) | |
252 | continue; | |
253 | do { | |
677d7623 | 254 | rc = signal_processor(cpu, sigp_stop); |
39ce010d | 255 | } while (rc == sigp_busy); |
1da177e4 | 256 | |
39ce010d | 257 | while (!smp_cpu_not_running(cpu)) |
c6b5b847 HC |
258 | cpu_relax(); |
259 | } | |
260 | } | |
261 | ||
1da177e4 LT |
262 | /* |
263 | * This is the main routine where commands issued by other | |
264 | * cpus are handled. | |
265 | */ | |
266 | ||
2b67fc46 | 267 | static void do_ext_call_interrupt(__u16 code) |
1da177e4 | 268 | { |
39ce010d | 269 | unsigned long bits; |
1da177e4 | 270 | |
39ce010d HC |
271 | /* |
272 | * handle bit signal external calls | |
273 | * | |
274 | * For the ec_schedule signal we have to do nothing. All the work | |
275 | * is done automatically when we return from the interrupt. | |
276 | */ | |
1da177e4 LT |
277 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
278 | ||
39ce010d | 279 | if (test_bit(ec_call_function, &bits)) |
1da177e4 LT |
280 | do_call_function(); |
281 | } | |
282 | ||
283 | /* | |
284 | * Send an external call sigp to another cpu and return without waiting | |
285 | * for its completion. | |
286 | */ | |
287 | static void smp_ext_bitcall(int cpu, ec_bit_sig sig) | |
288 | { | |
39ce010d HC |
289 | /* |
290 | * Set signaling bit in lowcore of target cpu and kick it | |
291 | */ | |
1da177e4 | 292 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
39ce010d | 293 | while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) |
1da177e4 LT |
294 | udelay(10); |
295 | } | |
296 | ||
347a8dc3 | 297 | #ifndef CONFIG_64BIT |
1da177e4 LT |
298 | /* |
299 | * this function sends a 'purge tlb' signal to another CPU. | |
300 | */ | |
301 | void smp_ptlb_callback(void *info) | |
302 | { | |
ba8a9229 | 303 | __tlb_flush_local(); |
1da177e4 LT |
304 | } |
305 | ||
306 | void smp_ptlb_all(void) | |
307 | { | |
39ce010d | 308 | on_each_cpu(smp_ptlb_callback, NULL, 0, 1); |
1da177e4 LT |
309 | } |
310 | EXPORT_SYMBOL(smp_ptlb_all); | |
347a8dc3 | 311 | #endif /* ! CONFIG_64BIT */ |
1da177e4 LT |
312 | |
313 | /* | |
314 | * this function sends a 'reschedule' IPI to another CPU. | |
315 | * it goes straight through and wastes no time serializing | |
316 | * anything. Worst case is that we lose a reschedule ... | |
317 | */ | |
318 | void smp_send_reschedule(int cpu) | |
319 | { | |
39ce010d | 320 | smp_ext_bitcall(cpu, ec_schedule); |
1da177e4 LT |
321 | } |
322 | ||
323 | /* | |
324 | * parameter area for the set/clear control bit callbacks | |
325 | */ | |
94c12cc7 | 326 | struct ec_creg_mask_parms { |
1da177e4 LT |
327 | unsigned long orvals[16]; |
328 | unsigned long andvals[16]; | |
94c12cc7 | 329 | }; |
1da177e4 LT |
330 | |
331 | /* | |
332 | * callback for setting/clearing control bits | |
333 | */ | |
39ce010d HC |
334 | static void smp_ctl_bit_callback(void *info) |
335 | { | |
94c12cc7 | 336 | struct ec_creg_mask_parms *pp = info; |
1da177e4 LT |
337 | unsigned long cregs[16]; |
338 | int i; | |
39ce010d | 339 | |
94c12cc7 MS |
340 | __ctl_store(cregs, 0, 15); |
341 | for (i = 0; i <= 15; i++) | |
1da177e4 | 342 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
94c12cc7 | 343 | __ctl_load(cregs, 0, 15); |
1da177e4 LT |
344 | } |
345 | ||
346 | /* | |
347 | * Set a bit in a control register of all cpus | |
348 | */ | |
94c12cc7 MS |
349 | void smp_ctl_set_bit(int cr, int bit) |
350 | { | |
351 | struct ec_creg_mask_parms parms; | |
1da177e4 | 352 | |
94c12cc7 MS |
353 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
354 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); | |
1da177e4 | 355 | parms.orvals[cr] = 1 << bit; |
94c12cc7 | 356 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
1da177e4 | 357 | } |
39ce010d | 358 | EXPORT_SYMBOL(smp_ctl_set_bit); |
1da177e4 LT |
359 | |
360 | /* | |
361 | * Clear a bit in a control register of all cpus | |
362 | */ | |
94c12cc7 MS |
363 | void smp_ctl_clear_bit(int cr, int bit) |
364 | { | |
365 | struct ec_creg_mask_parms parms; | |
1da177e4 | 366 | |
94c12cc7 MS |
367 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
368 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); | |
1da177e4 | 369 | parms.andvals[cr] = ~(1L << bit); |
94c12cc7 | 370 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
1da177e4 | 371 | } |
39ce010d | 372 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
1da177e4 | 373 | |
08d07968 HC |
374 | /* |
375 | * In early ipl state a temp. logically cpu number is needed, so the sigp | |
376 | * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on | |
377 | * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1. | |
378 | */ | |
379 | #define CPU_INIT_NO 1 | |
380 | ||
411ed322 MH |
381 | #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) |
382 | ||
383 | /* | |
384 | * zfcpdump_prefix_array holds prefix registers for the following scenario: | |
385 | * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to | |
386 | * save its prefix registers, since they get lost, when switching from 31 bit | |
387 | * to 64 bit. | |
388 | */ | |
389 | unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \ | |
390 | __attribute__((__section__(".data"))); | |
391 | ||
285f6722 | 392 | static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) |
411ed322 | 393 | { |
411ed322 MH |
394 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
395 | return; | |
285f6722 HC |
396 | if (cpu >= NR_CPUS) { |
397 | printk(KERN_WARNING "Registers for cpu %i not saved since dump " | |
398 | "kernel was compiled with NR_CPUS=%i\n", cpu, NR_CPUS); | |
399 | return; | |
411ed322 | 400 | } |
48483b32 | 401 | zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL); |
08d07968 HC |
402 | __cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu; |
403 | while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) == | |
404 | sigp_busy) | |
285f6722 HC |
405 | cpu_relax(); |
406 | memcpy(zfcpdump_save_areas[cpu], | |
407 | (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, | |
408 | SAVE_AREA_SIZE); | |
409 | #ifdef CONFIG_64BIT | |
410 | /* copy original prefix register */ | |
411 | zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu]; | |
412 | #endif | |
411ed322 MH |
413 | } |
414 | ||
415 | union save_area *zfcpdump_save_areas[NR_CPUS + 1]; | |
416 | EXPORT_SYMBOL_GPL(zfcpdump_save_areas); | |
417 | ||
418 | #else | |
285f6722 HC |
419 | |
420 | static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } | |
421 | ||
422 | #endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */ | |
411ed322 | 423 | |
08d07968 HC |
424 | static int cpu_stopped(int cpu) |
425 | { | |
426 | __u32 status; | |
427 | ||
428 | /* Check for stopped state */ | |
429 | if (signal_processor_ps(&status, 0, cpu, sigp_sense) == | |
430 | sigp_status_stored) { | |
431 | if (status & 0x40) | |
432 | return 1; | |
433 | } | |
434 | return 0; | |
435 | } | |
436 | ||
08d07968 HC |
437 | static int cpu_known(int cpu_id) |
438 | { | |
439 | int cpu; | |
440 | ||
441 | for_each_present_cpu(cpu) { | |
442 | if (__cpu_logical_map[cpu] == cpu_id) | |
443 | return 1; | |
444 | } | |
445 | return 0; | |
446 | } | |
447 | ||
448 | static int smp_rescan_cpus_sigp(cpumask_t avail) | |
449 | { | |
450 | int cpu_id, logical_cpu; | |
451 | ||
452 | logical_cpu = first_cpu(avail); | |
453 | if (logical_cpu == NR_CPUS) | |
454 | return 0; | |
455 | for (cpu_id = 0; cpu_id <= 65535; cpu_id++) { | |
456 | if (cpu_known(cpu_id)) | |
457 | continue; | |
458 | __cpu_logical_map[logical_cpu] = cpu_id; | |
459 | if (!cpu_stopped(logical_cpu)) | |
460 | continue; | |
461 | cpu_set(logical_cpu, cpu_present_map); | |
462 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; | |
463 | logical_cpu = next_cpu(logical_cpu, avail); | |
464 | if (logical_cpu == NR_CPUS) | |
465 | break; | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
48483b32 | 470 | static int smp_rescan_cpus_sclp(cpumask_t avail) |
08d07968 HC |
471 | { |
472 | struct sclp_cpu_info *info; | |
473 | int cpu_id, logical_cpu, cpu; | |
474 | int rc; | |
475 | ||
476 | logical_cpu = first_cpu(avail); | |
477 | if (logical_cpu == NR_CPUS) | |
478 | return 0; | |
48483b32 | 479 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
08d07968 HC |
480 | if (!info) |
481 | return -ENOMEM; | |
482 | rc = sclp_get_cpu_info(info); | |
483 | if (rc) | |
484 | goto out; | |
485 | for (cpu = 0; cpu < info->combined; cpu++) { | |
486 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) | |
487 | continue; | |
488 | cpu_id = info->cpu[cpu].address; | |
489 | if (cpu_known(cpu_id)) | |
490 | continue; | |
491 | __cpu_logical_map[logical_cpu] = cpu_id; | |
492 | cpu_set(logical_cpu, cpu_present_map); | |
493 | if (cpu >= info->configured) | |
494 | smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; | |
495 | else | |
496 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; | |
497 | logical_cpu = next_cpu(logical_cpu, avail); | |
498 | if (logical_cpu == NR_CPUS) | |
499 | break; | |
500 | } | |
501 | out: | |
48483b32 | 502 | kfree(info); |
08d07968 HC |
503 | return rc; |
504 | } | |
505 | ||
506 | static int smp_rescan_cpus(void) | |
507 | { | |
508 | cpumask_t avail; | |
509 | ||
48483b32 | 510 | cpus_xor(avail, cpu_possible_map, cpu_present_map); |
08d07968 HC |
511 | if (smp_use_sigp_detection) |
512 | return smp_rescan_cpus_sigp(avail); | |
513 | else | |
514 | return smp_rescan_cpus_sclp(avail); | |
1da177e4 LT |
515 | } |
516 | ||
48483b32 HC |
517 | static void __init smp_detect_cpus(void) |
518 | { | |
519 | unsigned int cpu, c_cpus, s_cpus; | |
520 | struct sclp_cpu_info *info; | |
521 | u16 boot_cpu_addr, cpu_addr; | |
522 | ||
523 | c_cpus = 1; | |
524 | s_cpus = 0; | |
525 | boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr; | |
526 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
527 | if (!info) | |
528 | panic("smp_detect_cpus failed to allocate memory\n"); | |
529 | /* Use sigp detection algorithm if sclp doesn't work. */ | |
530 | if (sclp_get_cpu_info(info)) { | |
531 | smp_use_sigp_detection = 1; | |
532 | for (cpu = 0; cpu <= 65535; cpu++) { | |
533 | if (cpu == boot_cpu_addr) | |
534 | continue; | |
535 | __cpu_logical_map[CPU_INIT_NO] = cpu; | |
536 | if (!cpu_stopped(CPU_INIT_NO)) | |
537 | continue; | |
538 | smp_get_save_area(c_cpus, cpu); | |
539 | c_cpus++; | |
540 | } | |
541 | goto out; | |
542 | } | |
543 | ||
544 | if (info->has_cpu_type) { | |
545 | for (cpu = 0; cpu < info->combined; cpu++) { | |
546 | if (info->cpu[cpu].address == boot_cpu_addr) { | |
547 | smp_cpu_type = info->cpu[cpu].type; | |
548 | break; | |
549 | } | |
550 | } | |
551 | } | |
552 | ||
553 | for (cpu = 0; cpu < info->combined; cpu++) { | |
554 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) | |
555 | continue; | |
556 | cpu_addr = info->cpu[cpu].address; | |
557 | if (cpu_addr == boot_cpu_addr) | |
558 | continue; | |
559 | __cpu_logical_map[CPU_INIT_NO] = cpu_addr; | |
560 | if (!cpu_stopped(CPU_INIT_NO)) { | |
561 | s_cpus++; | |
562 | continue; | |
563 | } | |
564 | smp_get_save_area(c_cpus, cpu_addr); | |
565 | c_cpus++; | |
566 | } | |
567 | out: | |
568 | kfree(info); | |
569 | printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus); | |
9d40d2e3 | 570 | get_online_cpus(); |
48483b32 | 571 | smp_rescan_cpus(); |
9d40d2e3 | 572 | put_online_cpus(); |
48483b32 HC |
573 | } |
574 | ||
1da177e4 | 575 | /* |
39ce010d | 576 | * Activate a secondary processor. |
1da177e4 | 577 | */ |
ea1f4eec | 578 | int __cpuinit start_secondary(void *cpuvoid) |
1da177e4 | 579 | { |
39ce010d HC |
580 | /* Setup the cpu */ |
581 | cpu_init(); | |
5bfb5d69 | 582 | preempt_disable(); |
d54853ef | 583 | /* Enable TOD clock interrupts on the secondary cpu. */ |
39ce010d | 584 | init_cpu_timer(); |
1da177e4 | 585 | #ifdef CONFIG_VIRT_TIMER |
d54853ef | 586 | /* Enable cpu timer interrupts on the secondary cpu. */ |
39ce010d | 587 | init_cpu_vtimer(); |
1da177e4 | 588 | #endif |
1da177e4 | 589 | /* Enable pfault pseudo page faults on this cpu. */ |
29b08d2b HC |
590 | pfault_init(); |
591 | ||
1da177e4 LT |
592 | /* Mark this cpu as online */ |
593 | cpu_set(smp_processor_id(), cpu_online_map); | |
594 | /* Switch on interrupts */ | |
595 | local_irq_enable(); | |
39ce010d HC |
596 | /* Print info about this processor */ |
597 | print_cpu_info(&S390_lowcore.cpu_data); | |
598 | /* cpu_idle will call schedule for us */ | |
599 | cpu_idle(); | |
600 | return 0; | |
1da177e4 LT |
601 | } |
602 | ||
603 | static void __init smp_create_idle(unsigned int cpu) | |
604 | { | |
605 | struct task_struct *p; | |
606 | ||
607 | /* | |
608 | * don't care about the psw and regs settings since we'll never | |
609 | * reschedule the forked task. | |
610 | */ | |
611 | p = fork_idle(cpu); | |
612 | if (IS_ERR(p)) | |
613 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); | |
614 | current_set[cpu] = p; | |
fae8b22d | 615 | spin_lock_init(&(&per_cpu(s390_idle, cpu))->lock); |
1da177e4 LT |
616 | } |
617 | ||
1cb6bb4b HC |
618 | static int __cpuinit smp_alloc_lowcore(int cpu) |
619 | { | |
620 | unsigned long async_stack, panic_stack; | |
621 | struct _lowcore *lowcore; | |
622 | int lc_order; | |
623 | ||
624 | lc_order = sizeof(long) == 8 ? 1 : 0; | |
625 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, lc_order); | |
626 | if (!lowcore) | |
627 | return -ENOMEM; | |
628 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); | |
1cb6bb4b | 629 | panic_stack = __get_free_page(GFP_KERNEL); |
591bb4f6 HC |
630 | if (!panic_stack || !async_stack) |
631 | goto out; | |
98c7b388 HC |
632 | memcpy(lowcore, &S390_lowcore, 512); |
633 | memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512); | |
1cb6bb4b HC |
634 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
635 | lowcore->panic_stack = panic_stack + PAGE_SIZE; | |
636 | ||
637 | #ifndef CONFIG_64BIT | |
638 | if (MACHINE_HAS_IEEE) { | |
639 | unsigned long save_area; | |
640 | ||
641 | save_area = get_zeroed_page(GFP_KERNEL); | |
642 | if (!save_area) | |
643 | goto out_save_area; | |
644 | lowcore->extended_save_area_addr = (u32) save_area; | |
645 | } | |
646 | #endif | |
647 | lowcore_ptr[cpu] = lowcore; | |
648 | return 0; | |
649 | ||
650 | #ifndef CONFIG_64BIT | |
651 | out_save_area: | |
652 | free_page(panic_stack); | |
653 | #endif | |
591bb4f6 | 654 | out: |
1cb6bb4b | 655 | free_pages(async_stack, ASYNC_ORDER); |
1cb6bb4b HC |
656 | free_pages((unsigned long) lowcore, lc_order); |
657 | return -ENOMEM; | |
658 | } | |
659 | ||
660 | #ifdef CONFIG_HOTPLUG_CPU | |
661 | static void smp_free_lowcore(int cpu) | |
662 | { | |
663 | struct _lowcore *lowcore; | |
664 | int lc_order; | |
665 | ||
666 | lc_order = sizeof(long) == 8 ? 1 : 0; | |
667 | lowcore = lowcore_ptr[cpu]; | |
668 | #ifndef CONFIG_64BIT | |
669 | if (MACHINE_HAS_IEEE) | |
670 | free_page((unsigned long) lowcore->extended_save_area_addr); | |
671 | #endif | |
672 | free_page(lowcore->panic_stack - PAGE_SIZE); | |
673 | free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER); | |
674 | free_pages((unsigned long) lowcore, lc_order); | |
675 | lowcore_ptr[cpu] = NULL; | |
676 | } | |
677 | #endif /* CONFIG_HOTPLUG_CPU */ | |
678 | ||
1da177e4 | 679 | /* Upping and downing of CPUs */ |
1cb6bb4b | 680 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 LT |
681 | { |
682 | struct task_struct *idle; | |
39ce010d | 683 | struct _lowcore *cpu_lowcore; |
1da177e4 | 684 | struct stack_frame *sf; |
39ce010d | 685 | sigp_ccode ccode; |
1da177e4 | 686 | |
08d07968 HC |
687 | if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) |
688 | return -EIO; | |
1cb6bb4b HC |
689 | if (smp_alloc_lowcore(cpu)) |
690 | return -ENOMEM; | |
1da177e4 LT |
691 | |
692 | ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]), | |
693 | cpu, sigp_set_prefix); | |
39ce010d | 694 | if (ccode) { |
1da177e4 LT |
695 | printk("sigp_set_prefix failed for cpu %d " |
696 | "with condition code %d\n", | |
697 | (int) cpu, (int) ccode); | |
698 | return -EIO; | |
699 | } | |
700 | ||
701 | idle = current_set[cpu]; | |
39ce010d | 702 | cpu_lowcore = lowcore_ptr[cpu]; |
1da177e4 | 703 | cpu_lowcore->kernel_stack = (unsigned long) |
39ce010d | 704 | task_stack_page(idle) + THREAD_SIZE; |
1cb6bb4b | 705 | cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle); |
1da177e4 LT |
706 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
707 | - sizeof(struct pt_regs) | |
708 | - sizeof(struct stack_frame)); | |
709 | memset(sf, 0, sizeof(struct stack_frame)); | |
710 | sf->gprs[9] = (unsigned long) sf; | |
711 | cpu_lowcore->save_area[15] = (unsigned long) sf; | |
712 | __ctl_store(cpu_lowcore->cregs_save_area[0], 0, 15); | |
94c12cc7 MS |
713 | asm volatile( |
714 | " stam 0,15,0(%0)" | |
715 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); | |
1da177e4 | 716 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
39ce010d HC |
717 | cpu_lowcore->current_task = (unsigned long) idle; |
718 | cpu_lowcore->cpu_data.cpu_nr = cpu; | |
591bb4f6 HC |
719 | cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce; |
720 | cpu_lowcore->ipl_device = S390_lowcore.ipl_device; | |
1da177e4 | 721 | eieio(); |
699ff13f | 722 | |
39ce010d | 723 | while (signal_processor(cpu, sigp_restart) == sigp_busy) |
699ff13f | 724 | udelay(10); |
1da177e4 LT |
725 | |
726 | while (!cpu_online(cpu)) | |
727 | cpu_relax(); | |
728 | return 0; | |
729 | } | |
730 | ||
48483b32 | 731 | static int __init setup_possible_cpus(char *s) |
255acee7 | 732 | { |
48483b32 | 733 | int pcpus, cpu; |
255acee7 | 734 | |
48483b32 HC |
735 | pcpus = simple_strtoul(s, NULL, 0); |
736 | cpu_possible_map = cpumask_of_cpu(0); | |
737 | for (cpu = 1; cpu < pcpus && cpu < NR_CPUS; cpu++) | |
255acee7 | 738 | cpu_set(cpu, cpu_possible_map); |
37a33026 HC |
739 | return 0; |
740 | } | |
741 | early_param("possible_cpus", setup_possible_cpus); | |
742 | ||
48483b32 HC |
743 | #ifdef CONFIG_HOTPLUG_CPU |
744 | ||
39ce010d | 745 | int __cpu_disable(void) |
1da177e4 | 746 | { |
94c12cc7 | 747 | struct ec_creg_mask_parms cr_parms; |
f3705136 | 748 | int cpu = smp_processor_id(); |
1da177e4 | 749 | |
f3705136 | 750 | cpu_clear(cpu, cpu_online_map); |
1da177e4 | 751 | |
1da177e4 | 752 | /* Disable pfault pseudo page faults on this cpu. */ |
29b08d2b | 753 | pfault_fini(); |
1da177e4 | 754 | |
94c12cc7 MS |
755 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
756 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); | |
1da177e4 | 757 | |
94c12cc7 | 758 | /* disable all external interrupts */ |
1da177e4 | 759 | cr_parms.orvals[0] = 0; |
39ce010d HC |
760 | cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 | |
761 | 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4); | |
1da177e4 | 762 | /* disable all I/O interrupts */ |
1da177e4 | 763 | cr_parms.orvals[6] = 0; |
39ce010d HC |
764 | cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | |
765 | 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); | |
1da177e4 | 766 | /* disable most machine checks */ |
1da177e4 | 767 | cr_parms.orvals[14] = 0; |
39ce010d HC |
768 | cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | |
769 | 1 << 25 | 1 << 24); | |
94c12cc7 | 770 | |
1da177e4 LT |
771 | smp_ctl_bit_callback(&cr_parms); |
772 | ||
1da177e4 LT |
773 | return 0; |
774 | } | |
775 | ||
39ce010d | 776 | void __cpu_die(unsigned int cpu) |
1da177e4 LT |
777 | { |
778 | /* Wait until target cpu is down */ | |
779 | while (!smp_cpu_not_running(cpu)) | |
780 | cpu_relax(); | |
1cb6bb4b | 781 | smp_free_lowcore(cpu); |
08d07968 | 782 | printk(KERN_INFO "Processor %d spun down\n", cpu); |
1da177e4 LT |
783 | } |
784 | ||
39ce010d | 785 | void cpu_die(void) |
1da177e4 LT |
786 | { |
787 | idle_task_exit(); | |
788 | signal_processor(smp_processor_id(), sigp_stop); | |
789 | BUG(); | |
39ce010d | 790 | for (;;); |
1da177e4 LT |
791 | } |
792 | ||
255acee7 HC |
793 | #endif /* CONFIG_HOTPLUG_CPU */ |
794 | ||
1da177e4 LT |
795 | void __init smp_prepare_cpus(unsigned int max_cpus) |
796 | { | |
591bb4f6 HC |
797 | #ifndef CONFIG_64BIT |
798 | unsigned long save_area = 0; | |
799 | #endif | |
800 | unsigned long async_stack, panic_stack; | |
801 | struct _lowcore *lowcore; | |
1da177e4 | 802 | unsigned int cpu; |
591bb4f6 | 803 | int lc_order; |
39ce010d | 804 | |
48483b32 HC |
805 | smp_detect_cpus(); |
806 | ||
39ce010d HC |
807 | /* request the 0x1201 emergency signal external interrupt */ |
808 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) | |
809 | panic("Couldn't request external interrupt 0x1201"); | |
1da177e4 LT |
810 | print_cpu_info(&S390_lowcore.cpu_data); |
811 | ||
591bb4f6 HC |
812 | /* Reallocate current lowcore, but keep its contents. */ |
813 | lc_order = sizeof(long) == 8 ? 1 : 0; | |
814 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, lc_order); | |
815 | panic_stack = __get_free_page(GFP_KERNEL); | |
816 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); | |
347a8dc3 | 817 | #ifndef CONFIG_64BIT |
77fa2245 | 818 | if (MACHINE_HAS_IEEE) |
591bb4f6 | 819 | save_area = get_zeroed_page(GFP_KERNEL); |
77fa2245 | 820 | #endif |
591bb4f6 HC |
821 | local_irq_disable(); |
822 | local_mcck_disable(); | |
823 | lowcore_ptr[smp_processor_id()] = lowcore; | |
824 | *lowcore = S390_lowcore; | |
825 | lowcore->panic_stack = panic_stack + PAGE_SIZE; | |
826 | lowcore->async_stack = async_stack + ASYNC_SIZE; | |
827 | #ifndef CONFIG_64BIT | |
828 | if (MACHINE_HAS_IEEE) | |
829 | lowcore->extended_save_area_addr = (u32) save_area; | |
830 | #endif | |
831 | set_prefix((u32)(unsigned long) lowcore); | |
832 | local_mcck_enable(); | |
833 | local_irq_enable(); | |
97db7fbf | 834 | for_each_possible_cpu(cpu) |
1da177e4 LT |
835 | if (cpu != smp_processor_id()) |
836 | smp_create_idle(cpu); | |
837 | } | |
838 | ||
ea1f4eec | 839 | void __init smp_prepare_boot_cpu(void) |
1da177e4 LT |
840 | { |
841 | BUG_ON(smp_processor_id() != 0); | |
842 | ||
48483b32 HC |
843 | current_thread_info()->cpu = 0; |
844 | cpu_set(0, cpu_present_map); | |
1da177e4 | 845 | cpu_set(0, cpu_online_map); |
1da177e4 LT |
846 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
847 | current_set[0] = current; | |
08d07968 | 848 | smp_cpu_state[0] = CPU_STATE_CONFIGURED; |
fae8b22d | 849 | spin_lock_init(&(&__get_cpu_var(s390_idle))->lock); |
1da177e4 LT |
850 | } |
851 | ||
ea1f4eec | 852 | void __init smp_cpus_done(unsigned int max_cpus) |
1da177e4 | 853 | { |
1da177e4 LT |
854 | } |
855 | ||
856 | /* | |
857 | * the frequency of the profiling timer can be changed | |
858 | * by writing a multiplier value into /proc/profile. | |
859 | * | |
860 | * usually you want to run this on all CPUs ;) | |
861 | */ | |
862 | int setup_profiling_timer(unsigned int multiplier) | |
863 | { | |
39ce010d | 864 | return 0; |
1da177e4 LT |
865 | } |
866 | ||
08d07968 HC |
867 | #ifdef CONFIG_HOTPLUG_CPU |
868 | static ssize_t cpu_configure_show(struct sys_device *dev, char *buf) | |
869 | { | |
870 | ssize_t count; | |
871 | ||
872 | mutex_lock(&smp_cpu_state_mutex); | |
873 | count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); | |
874 | mutex_unlock(&smp_cpu_state_mutex); | |
875 | return count; | |
876 | } | |
877 | ||
878 | static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf, | |
879 | size_t count) | |
880 | { | |
881 | int cpu = dev->id; | |
882 | int val, rc; | |
883 | char delim; | |
884 | ||
885 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
886 | return -EINVAL; | |
887 | if (val != 0 && val != 1) | |
888 | return -EINVAL; | |
889 | ||
890 | mutex_lock(&smp_cpu_state_mutex); | |
9d40d2e3 | 891 | get_online_cpus(); |
08d07968 HC |
892 | rc = -EBUSY; |
893 | if (cpu_online(cpu)) | |
894 | goto out; | |
895 | rc = 0; | |
896 | switch (val) { | |
897 | case 0: | |
898 | if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { | |
899 | rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); | |
900 | if (!rc) | |
901 | smp_cpu_state[cpu] = CPU_STATE_STANDBY; | |
902 | } | |
903 | break; | |
904 | case 1: | |
905 | if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { | |
906 | rc = sclp_cpu_configure(__cpu_logical_map[cpu]); | |
907 | if (!rc) | |
908 | smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; | |
909 | } | |
910 | break; | |
911 | default: | |
912 | break; | |
913 | } | |
914 | out: | |
9d40d2e3 | 915 | put_online_cpus(); |
08d07968 HC |
916 | mutex_unlock(&smp_cpu_state_mutex); |
917 | return rc ? rc : count; | |
918 | } | |
919 | static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); | |
920 | #endif /* CONFIG_HOTPLUG_CPU */ | |
921 | ||
922 | static ssize_t show_cpu_address(struct sys_device *dev, char *buf) | |
923 | { | |
924 | return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); | |
925 | } | |
926 | static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL); | |
927 | ||
928 | ||
929 | static struct attribute *cpu_common_attrs[] = { | |
930 | #ifdef CONFIG_HOTPLUG_CPU | |
931 | &attr_configure.attr, | |
932 | #endif | |
933 | &attr_address.attr, | |
934 | NULL, | |
935 | }; | |
936 | ||
937 | static struct attribute_group cpu_common_attr_group = { | |
938 | .attrs = cpu_common_attrs, | |
939 | }; | |
1da177e4 | 940 | |
2fc2d1e9 HC |
941 | static ssize_t show_capability(struct sys_device *dev, char *buf) |
942 | { | |
943 | unsigned int capability; | |
944 | int rc; | |
945 | ||
946 | rc = get_cpu_capability(&capability); | |
947 | if (rc) | |
948 | return rc; | |
949 | return sprintf(buf, "%u\n", capability); | |
950 | } | |
951 | static SYSDEV_ATTR(capability, 0444, show_capability, NULL); | |
952 | ||
fae8b22d HC |
953 | static ssize_t show_idle_count(struct sys_device *dev, char *buf) |
954 | { | |
955 | struct s390_idle_data *idle; | |
956 | unsigned long long idle_count; | |
957 | ||
958 | idle = &per_cpu(s390_idle, dev->id); | |
959 | spin_lock_irq(&idle->lock); | |
960 | idle_count = idle->idle_count; | |
961 | spin_unlock_irq(&idle->lock); | |
962 | return sprintf(buf, "%llu\n", idle_count); | |
963 | } | |
964 | static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); | |
965 | ||
966 | static ssize_t show_idle_time(struct sys_device *dev, char *buf) | |
967 | { | |
968 | struct s390_idle_data *idle; | |
969 | unsigned long long new_time; | |
970 | ||
971 | idle = &per_cpu(s390_idle, dev->id); | |
972 | spin_lock_irq(&idle->lock); | |
973 | if (idle->in_idle) { | |
974 | new_time = get_clock(); | |
975 | idle->idle_time += new_time - idle->idle_enter; | |
976 | idle->idle_enter = new_time; | |
977 | } | |
978 | new_time = idle->idle_time; | |
979 | spin_unlock_irq(&idle->lock); | |
69d39d66 | 980 | return sprintf(buf, "%llu\n", new_time >> 12); |
fae8b22d | 981 | } |
69d39d66 | 982 | static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); |
fae8b22d | 983 | |
08d07968 | 984 | static struct attribute *cpu_online_attrs[] = { |
fae8b22d HC |
985 | &attr_capability.attr, |
986 | &attr_idle_count.attr, | |
69d39d66 | 987 | &attr_idle_time_us.attr, |
fae8b22d HC |
988 | NULL, |
989 | }; | |
990 | ||
08d07968 HC |
991 | static struct attribute_group cpu_online_attr_group = { |
992 | .attrs = cpu_online_attrs, | |
fae8b22d HC |
993 | }; |
994 | ||
2fc2d1e9 HC |
995 | static int __cpuinit smp_cpu_notify(struct notifier_block *self, |
996 | unsigned long action, void *hcpu) | |
997 | { | |
998 | unsigned int cpu = (unsigned int)(long)hcpu; | |
999 | struct cpu *c = &per_cpu(cpu_devices, cpu); | |
1000 | struct sys_device *s = &c->sysdev; | |
fae8b22d | 1001 | struct s390_idle_data *idle; |
2fc2d1e9 HC |
1002 | |
1003 | switch (action) { | |
1004 | case CPU_ONLINE: | |
8bb78442 | 1005 | case CPU_ONLINE_FROZEN: |
fae8b22d HC |
1006 | idle = &per_cpu(s390_idle, cpu); |
1007 | spin_lock_irq(&idle->lock); | |
1008 | idle->idle_enter = 0; | |
1009 | idle->idle_time = 0; | |
1010 | idle->idle_count = 0; | |
1011 | spin_unlock_irq(&idle->lock); | |
08d07968 | 1012 | if (sysfs_create_group(&s->kobj, &cpu_online_attr_group)) |
2fc2d1e9 HC |
1013 | return NOTIFY_BAD; |
1014 | break; | |
1015 | case CPU_DEAD: | |
8bb78442 | 1016 | case CPU_DEAD_FROZEN: |
08d07968 | 1017 | sysfs_remove_group(&s->kobj, &cpu_online_attr_group); |
2fc2d1e9 HC |
1018 | break; |
1019 | } | |
1020 | return NOTIFY_OK; | |
1021 | } | |
1022 | ||
1023 | static struct notifier_block __cpuinitdata smp_cpu_nb = { | |
39ce010d | 1024 | .notifier_call = smp_cpu_notify, |
2fc2d1e9 HC |
1025 | }; |
1026 | ||
2bc89b5e | 1027 | static int __devinit smp_add_present_cpu(int cpu) |
08d07968 HC |
1028 | { |
1029 | struct cpu *c = &per_cpu(cpu_devices, cpu); | |
1030 | struct sys_device *s = &c->sysdev; | |
1031 | int rc; | |
1032 | ||
1033 | c->hotpluggable = 1; | |
1034 | rc = register_cpu(c, cpu); | |
1035 | if (rc) | |
1036 | goto out; | |
1037 | rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group); | |
1038 | if (rc) | |
1039 | goto out_cpu; | |
1040 | if (!cpu_online(cpu)) | |
1041 | goto out; | |
1042 | rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); | |
1043 | if (!rc) | |
1044 | return 0; | |
1045 | sysfs_remove_group(&s->kobj, &cpu_common_attr_group); | |
1046 | out_cpu: | |
1047 | #ifdef CONFIG_HOTPLUG_CPU | |
1048 | unregister_cpu(c); | |
1049 | #endif | |
1050 | out: | |
1051 | return rc; | |
1052 | } | |
1053 | ||
1054 | #ifdef CONFIG_HOTPLUG_CPU | |
2bc89b5e HC |
1055 | static ssize_t __ref rescan_store(struct sys_device *dev, |
1056 | const char *buf, size_t count) | |
08d07968 HC |
1057 | { |
1058 | cpumask_t newcpus; | |
1059 | int cpu; | |
1060 | int rc; | |
1061 | ||
1062 | mutex_lock(&smp_cpu_state_mutex); | |
9d40d2e3 | 1063 | get_online_cpus(); |
08d07968 HC |
1064 | newcpus = cpu_present_map; |
1065 | rc = smp_rescan_cpus(); | |
1066 | if (rc) | |
1067 | goto out; | |
1068 | cpus_andnot(newcpus, cpu_present_map, newcpus); | |
1069 | for_each_cpu_mask(cpu, newcpus) { | |
1070 | rc = smp_add_present_cpu(cpu); | |
1071 | if (rc) | |
1072 | cpu_clear(cpu, cpu_present_map); | |
1073 | } | |
1074 | rc = 0; | |
1075 | out: | |
9d40d2e3 | 1076 | put_online_cpus(); |
08d07968 HC |
1077 | mutex_unlock(&smp_cpu_state_mutex); |
1078 | return rc ? rc : count; | |
1079 | } | |
1080 | static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store); | |
1081 | #endif /* CONFIG_HOTPLUG_CPU */ | |
1082 | ||
1da177e4 LT |
1083 | static int __init topology_init(void) |
1084 | { | |
1085 | int cpu; | |
fae8b22d | 1086 | int rc; |
2fc2d1e9 HC |
1087 | |
1088 | register_cpu_notifier(&smp_cpu_nb); | |
1da177e4 | 1089 | |
08d07968 HC |
1090 | #ifdef CONFIG_HOTPLUG_CPU |
1091 | rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj, | |
1092 | &attr_rescan.attr); | |
1093 | if (rc) | |
1094 | return rc; | |
1095 | #endif | |
1096 | for_each_present_cpu(cpu) { | |
1097 | rc = smp_add_present_cpu(cpu); | |
fae8b22d HC |
1098 | if (rc) |
1099 | return rc; | |
1da177e4 LT |
1100 | } |
1101 | return 0; | |
1102 | } | |
1da177e4 | 1103 | subsys_initcall(topology_init); |