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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 | ||
dbd70fb4 | 70 | DEFINE_MUTEX(smp_cpu_state_mutex); |
08d07968 HC |
71 | static int smp_cpu_state[NR_CPUS]; |
72 | ||
73 | static DEFINE_PER_CPU(struct cpu, cpu_devices); | |
74 | DEFINE_PER_CPU(struct s390_idle_data, s390_idle); | |
75 | ||
1da177e4 | 76 | static void smp_ext_bitcall(int, ec_bit_sig); |
1da177e4 LT |
77 | |
78 | /* | |
63db6e8d JG |
79 | * Structure and data for __smp_call_function_map(). This is designed to |
80 | * minimise static memory requirements. It also looks cleaner. | |
1da177e4 LT |
81 | */ |
82 | static DEFINE_SPINLOCK(call_lock); | |
83 | ||
84 | struct call_data_struct { | |
85 | void (*func) (void *info); | |
86 | void *info; | |
63db6e8d JG |
87 | cpumask_t started; |
88 | cpumask_t finished; | |
1da177e4 LT |
89 | int wait; |
90 | }; | |
91 | ||
39ce010d | 92 | static struct call_data_struct *call_data; |
1da177e4 LT |
93 | |
94 | /* | |
95 | * 'Call function' interrupt callback | |
96 | */ | |
97 | static void do_call_function(void) | |
98 | { | |
99 | void (*func) (void *info) = call_data->func; | |
100 | void *info = call_data->info; | |
101 | int wait = call_data->wait; | |
102 | ||
63db6e8d | 103 | cpu_set(smp_processor_id(), call_data->started); |
1da177e4 LT |
104 | (*func)(info); |
105 | if (wait) | |
63db6e8d | 106 | cpu_set(smp_processor_id(), call_data->finished);; |
1da177e4 LT |
107 | } |
108 | ||
63db6e8d JG |
109 | static void __smp_call_function_map(void (*func) (void *info), void *info, |
110 | int nonatomic, int wait, cpumask_t map) | |
1da177e4 LT |
111 | { |
112 | struct call_data_struct data; | |
63db6e8d | 113 | int cpu, local = 0; |
1da177e4 | 114 | |
63db6e8d | 115 | /* |
25864162 | 116 | * Can deadlock when interrupts are disabled or if in wrong context. |
63db6e8d | 117 | */ |
25864162 | 118 | WARN_ON(irqs_disabled() || in_irq()); |
1da177e4 | 119 | |
63db6e8d JG |
120 | /* |
121 | * Check for local function call. We have to have the same call order | |
122 | * as in on_each_cpu() because of machine_restart_smp(). | |
123 | */ | |
124 | if (cpu_isset(smp_processor_id(), map)) { | |
125 | local = 1; | |
126 | cpu_clear(smp_processor_id(), map); | |
127 | } | |
128 | ||
129 | cpus_and(map, map, cpu_online_map); | |
130 | if (cpus_empty(map)) | |
131 | goto out; | |
1da177e4 LT |
132 | |
133 | data.func = func; | |
134 | data.info = info; | |
63db6e8d | 135 | data.started = CPU_MASK_NONE; |
1da177e4 LT |
136 | data.wait = wait; |
137 | if (wait) | |
63db6e8d | 138 | data.finished = CPU_MASK_NONE; |
1da177e4 | 139 | |
8da1aecd | 140 | spin_lock(&call_lock); |
1da177e4 | 141 | call_data = &data; |
63db6e8d JG |
142 | |
143 | for_each_cpu_mask(cpu, map) | |
144 | smp_ext_bitcall(cpu, ec_call_function); | |
1da177e4 LT |
145 | |
146 | /* Wait for response */ | |
63db6e8d | 147 | while (!cpus_equal(map, data.started)) |
1da177e4 | 148 | cpu_relax(); |
1da177e4 | 149 | if (wait) |
63db6e8d | 150 | while (!cpus_equal(map, data.finished)) |
1da177e4 | 151 | cpu_relax(); |
8da1aecd | 152 | spin_unlock(&call_lock); |
63db6e8d | 153 | out: |
8da1aecd HC |
154 | if (local) { |
155 | local_irq_disable(); | |
63db6e8d | 156 | func(info); |
8da1aecd HC |
157 | local_irq_enable(); |
158 | } | |
1da177e4 LT |
159 | } |
160 | ||
161 | /* | |
63db6e8d JG |
162 | * smp_call_function: |
163 | * @func: the function to run; this must be fast and non-blocking | |
164 | * @info: an arbitrary pointer to pass to the function | |
165 | * @nonatomic: unused | |
166 | * @wait: if true, wait (atomically) until function has completed on other CPUs | |
1da177e4 | 167 | * |
63db6e8d | 168 | * Run a function on all other CPUs. |
1da177e4 | 169 | * |
39ce010d HC |
170 | * You must not call this function with disabled interrupts, from a |
171 | * hardware interrupt handler or from a bottom half. | |
1da177e4 | 172 | */ |
63db6e8d JG |
173 | int smp_call_function(void (*func) (void *info), void *info, int nonatomic, |
174 | int wait) | |
1da177e4 | 175 | { |
63db6e8d | 176 | cpumask_t map; |
1da177e4 | 177 | |
25864162 | 178 | preempt_disable(); |
63db6e8d JG |
179 | map = cpu_online_map; |
180 | cpu_clear(smp_processor_id(), map); | |
181 | __smp_call_function_map(func, info, nonatomic, wait, map); | |
25864162 | 182 | preempt_enable(); |
63db6e8d JG |
183 | return 0; |
184 | } | |
185 | EXPORT_SYMBOL(smp_call_function); | |
1da177e4 | 186 | |
63db6e8d | 187 | /* |
3bb447fc HC |
188 | * smp_call_function_single: |
189 | * @cpu: the CPU where func should run | |
63db6e8d JG |
190 | * @func: the function to run; this must be fast and non-blocking |
191 | * @info: an arbitrary pointer to pass to the function | |
192 | * @nonatomic: unused | |
193 | * @wait: if true, wait (atomically) until function has completed on other CPUs | |
63db6e8d JG |
194 | * |
195 | * Run a function on one processor. | |
196 | * | |
39ce010d HC |
197 | * You must not call this function with disabled interrupts, from a |
198 | * hardware interrupt handler or from a bottom half. | |
63db6e8d | 199 | */ |
3bb447fc HC |
200 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, |
201 | int nonatomic, int wait) | |
63db6e8d | 202 | { |
25864162 | 203 | preempt_disable(); |
3bb447fc HC |
204 | __smp_call_function_map(func, info, nonatomic, wait, |
205 | cpumask_of_cpu(cpu)); | |
25864162 | 206 | preempt_enable(); |
1da177e4 LT |
207 | return 0; |
208 | } | |
3bb447fc | 209 | EXPORT_SYMBOL(smp_call_function_single); |
1da177e4 | 210 | |
dab5209c CO |
211 | /** |
212 | * smp_call_function_mask(): Run a function on a set of other CPUs. | |
213 | * @mask: The set of cpus to run on. Must not include the current cpu. | |
214 | * @func: The function to run. This must be fast and non-blocking. | |
215 | * @info: An arbitrary pointer to pass to the function. | |
216 | * @wait: If true, wait (atomically) until function has completed on other CPUs. | |
217 | * | |
218 | * Returns 0 on success, else a negative status code. | |
219 | * | |
220 | * If @wait is true, then returns once @func has returned; otherwise | |
221 | * it returns just before the target cpu calls @func. | |
222 | * | |
223 | * You must not call this function with disabled interrupts or from a | |
224 | * hardware interrupt handler or from a bottom half handler. | |
225 | */ | |
37c5f719 HC |
226 | int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info, |
227 | int wait) | |
dab5209c CO |
228 | { |
229 | preempt_disable(); | |
37c5f719 | 230 | cpu_clear(smp_processor_id(), mask); |
dab5209c CO |
231 | __smp_call_function_map(func, info, 0, wait, mask); |
232 | preempt_enable(); | |
233 | return 0; | |
234 | } | |
235 | EXPORT_SYMBOL(smp_call_function_mask); | |
236 | ||
677d7623 | 237 | void smp_send_stop(void) |
1da177e4 | 238 | { |
39ce010d | 239 | int cpu, rc; |
1da177e4 | 240 | |
677d7623 HC |
241 | /* Disable all interrupts/machine checks */ |
242 | __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); | |
1da177e4 | 243 | |
677d7623 HC |
244 | /* write magic number to zero page (absolute 0) */ |
245 | lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC; | |
1da177e4 | 246 | |
677d7623 | 247 | /* stop all processors */ |
1da177e4 LT |
248 | for_each_online_cpu(cpu) { |
249 | if (cpu == smp_processor_id()) | |
250 | continue; | |
251 | do { | |
677d7623 | 252 | rc = signal_processor(cpu, sigp_stop); |
39ce010d | 253 | } while (rc == sigp_busy); |
1da177e4 | 254 | |
39ce010d | 255 | while (!smp_cpu_not_running(cpu)) |
c6b5b847 HC |
256 | cpu_relax(); |
257 | } | |
258 | } | |
259 | ||
1da177e4 LT |
260 | /* |
261 | * This is the main routine where commands issued by other | |
262 | * cpus are handled. | |
263 | */ | |
264 | ||
2b67fc46 | 265 | static void do_ext_call_interrupt(__u16 code) |
1da177e4 | 266 | { |
39ce010d | 267 | unsigned long bits; |
1da177e4 | 268 | |
39ce010d HC |
269 | /* |
270 | * handle bit signal external calls | |
271 | * | |
272 | * For the ec_schedule signal we have to do nothing. All the work | |
273 | * is done automatically when we return from the interrupt. | |
274 | */ | |
1da177e4 LT |
275 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
276 | ||
39ce010d | 277 | if (test_bit(ec_call_function, &bits)) |
1da177e4 LT |
278 | do_call_function(); |
279 | } | |
280 | ||
281 | /* | |
282 | * Send an external call sigp to another cpu and return without waiting | |
283 | * for its completion. | |
284 | */ | |
285 | static void smp_ext_bitcall(int cpu, ec_bit_sig sig) | |
286 | { | |
39ce010d HC |
287 | /* |
288 | * Set signaling bit in lowcore of target cpu and kick it | |
289 | */ | |
1da177e4 | 290 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
39ce010d | 291 | while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) |
1da177e4 LT |
292 | udelay(10); |
293 | } | |
294 | ||
347a8dc3 | 295 | #ifndef CONFIG_64BIT |
1da177e4 LT |
296 | /* |
297 | * this function sends a 'purge tlb' signal to another CPU. | |
298 | */ | |
299 | void smp_ptlb_callback(void *info) | |
300 | { | |
ba8a9229 | 301 | __tlb_flush_local(); |
1da177e4 LT |
302 | } |
303 | ||
304 | void smp_ptlb_all(void) | |
305 | { | |
39ce010d | 306 | on_each_cpu(smp_ptlb_callback, NULL, 0, 1); |
1da177e4 LT |
307 | } |
308 | EXPORT_SYMBOL(smp_ptlb_all); | |
347a8dc3 | 309 | #endif /* ! CONFIG_64BIT */ |
1da177e4 LT |
310 | |
311 | /* | |
312 | * this function sends a 'reschedule' IPI to another CPU. | |
313 | * it goes straight through and wastes no time serializing | |
314 | * anything. Worst case is that we lose a reschedule ... | |
315 | */ | |
316 | void smp_send_reschedule(int cpu) | |
317 | { | |
39ce010d | 318 | smp_ext_bitcall(cpu, ec_schedule); |
1da177e4 LT |
319 | } |
320 | ||
321 | /* | |
322 | * parameter area for the set/clear control bit callbacks | |
323 | */ | |
94c12cc7 | 324 | struct ec_creg_mask_parms { |
1da177e4 LT |
325 | unsigned long orvals[16]; |
326 | unsigned long andvals[16]; | |
94c12cc7 | 327 | }; |
1da177e4 LT |
328 | |
329 | /* | |
330 | * callback for setting/clearing control bits | |
331 | */ | |
39ce010d HC |
332 | static void smp_ctl_bit_callback(void *info) |
333 | { | |
94c12cc7 | 334 | struct ec_creg_mask_parms *pp = info; |
1da177e4 LT |
335 | unsigned long cregs[16]; |
336 | int i; | |
39ce010d | 337 | |
94c12cc7 MS |
338 | __ctl_store(cregs, 0, 15); |
339 | for (i = 0; i <= 15; i++) | |
1da177e4 | 340 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
94c12cc7 | 341 | __ctl_load(cregs, 0, 15); |
1da177e4 LT |
342 | } |
343 | ||
344 | /* | |
345 | * Set a bit in a control register of all cpus | |
346 | */ | |
94c12cc7 MS |
347 | void smp_ctl_set_bit(int cr, int bit) |
348 | { | |
349 | struct ec_creg_mask_parms parms; | |
1da177e4 | 350 | |
94c12cc7 MS |
351 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
352 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); | |
1da177e4 | 353 | parms.orvals[cr] = 1 << bit; |
94c12cc7 | 354 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
1da177e4 | 355 | } |
39ce010d | 356 | EXPORT_SYMBOL(smp_ctl_set_bit); |
1da177e4 LT |
357 | |
358 | /* | |
359 | * Clear a bit in a control register of all cpus | |
360 | */ | |
94c12cc7 MS |
361 | void smp_ctl_clear_bit(int cr, int bit) |
362 | { | |
363 | struct ec_creg_mask_parms parms; | |
1da177e4 | 364 | |
94c12cc7 MS |
365 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
366 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); | |
1da177e4 | 367 | parms.andvals[cr] = ~(1L << bit); |
94c12cc7 | 368 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
1da177e4 | 369 | } |
39ce010d | 370 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
1da177e4 | 371 | |
08d07968 HC |
372 | /* |
373 | * In early ipl state a temp. logically cpu number is needed, so the sigp | |
374 | * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on | |
375 | * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1. | |
376 | */ | |
377 | #define CPU_INIT_NO 1 | |
378 | ||
411ed322 MH |
379 | #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) |
380 | ||
381 | /* | |
382 | * zfcpdump_prefix_array holds prefix registers for the following scenario: | |
383 | * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to | |
384 | * save its prefix registers, since they get lost, when switching from 31 bit | |
385 | * to 64 bit. | |
386 | */ | |
387 | unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \ | |
388 | __attribute__((__section__(".data"))); | |
389 | ||
285f6722 | 390 | static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) |
411ed322 | 391 | { |
411ed322 MH |
392 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
393 | return; | |
285f6722 HC |
394 | if (cpu >= NR_CPUS) { |
395 | printk(KERN_WARNING "Registers for cpu %i not saved since dump " | |
396 | "kernel was compiled with NR_CPUS=%i\n", cpu, NR_CPUS); | |
397 | return; | |
411ed322 | 398 | } |
48483b32 | 399 | zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL); |
08d07968 HC |
400 | __cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu; |
401 | while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) == | |
402 | sigp_busy) | |
285f6722 HC |
403 | cpu_relax(); |
404 | memcpy(zfcpdump_save_areas[cpu], | |
405 | (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, | |
406 | SAVE_AREA_SIZE); | |
407 | #ifdef CONFIG_64BIT | |
408 | /* copy original prefix register */ | |
409 | zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu]; | |
410 | #endif | |
411ed322 MH |
411 | } |
412 | ||
413 | union save_area *zfcpdump_save_areas[NR_CPUS + 1]; | |
414 | EXPORT_SYMBOL_GPL(zfcpdump_save_areas); | |
415 | ||
416 | #else | |
285f6722 HC |
417 | |
418 | static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } | |
419 | ||
420 | #endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */ | |
411ed322 | 421 | |
08d07968 HC |
422 | static int cpu_stopped(int cpu) |
423 | { | |
424 | __u32 status; | |
425 | ||
426 | /* Check for stopped state */ | |
427 | if (signal_processor_ps(&status, 0, cpu, sigp_sense) == | |
428 | sigp_status_stored) { | |
429 | if (status & 0x40) | |
430 | return 1; | |
431 | } | |
432 | return 0; | |
433 | } | |
434 | ||
08d07968 HC |
435 | static int cpu_known(int cpu_id) |
436 | { | |
437 | int cpu; | |
438 | ||
439 | for_each_present_cpu(cpu) { | |
440 | if (__cpu_logical_map[cpu] == cpu_id) | |
441 | return 1; | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static int smp_rescan_cpus_sigp(cpumask_t avail) | |
447 | { | |
448 | int cpu_id, logical_cpu; | |
449 | ||
450 | logical_cpu = first_cpu(avail); | |
451 | if (logical_cpu == NR_CPUS) | |
452 | return 0; | |
453 | for (cpu_id = 0; cpu_id <= 65535; cpu_id++) { | |
454 | if (cpu_known(cpu_id)) | |
455 | continue; | |
456 | __cpu_logical_map[logical_cpu] = cpu_id; | |
457 | if (!cpu_stopped(logical_cpu)) | |
458 | continue; | |
459 | cpu_set(logical_cpu, cpu_present_map); | |
460 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; | |
461 | logical_cpu = next_cpu(logical_cpu, avail); | |
462 | if (logical_cpu == NR_CPUS) | |
463 | break; | |
464 | } | |
465 | return 0; | |
466 | } | |
467 | ||
48483b32 | 468 | static int smp_rescan_cpus_sclp(cpumask_t avail) |
08d07968 HC |
469 | { |
470 | struct sclp_cpu_info *info; | |
471 | int cpu_id, logical_cpu, cpu; | |
472 | int rc; | |
473 | ||
474 | logical_cpu = first_cpu(avail); | |
475 | if (logical_cpu == NR_CPUS) | |
476 | return 0; | |
48483b32 | 477 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
08d07968 HC |
478 | if (!info) |
479 | return -ENOMEM; | |
480 | rc = sclp_get_cpu_info(info); | |
481 | if (rc) | |
482 | goto out; | |
483 | for (cpu = 0; cpu < info->combined; cpu++) { | |
484 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) | |
485 | continue; | |
486 | cpu_id = info->cpu[cpu].address; | |
487 | if (cpu_known(cpu_id)) | |
488 | continue; | |
489 | __cpu_logical_map[logical_cpu] = cpu_id; | |
490 | cpu_set(logical_cpu, cpu_present_map); | |
491 | if (cpu >= info->configured) | |
492 | smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; | |
493 | else | |
494 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; | |
495 | logical_cpu = next_cpu(logical_cpu, avail); | |
496 | if (logical_cpu == NR_CPUS) | |
497 | break; | |
498 | } | |
499 | out: | |
48483b32 | 500 | kfree(info); |
08d07968 HC |
501 | return rc; |
502 | } | |
503 | ||
504 | static int smp_rescan_cpus(void) | |
505 | { | |
506 | cpumask_t avail; | |
507 | ||
48483b32 | 508 | cpus_xor(avail, cpu_possible_map, cpu_present_map); |
08d07968 HC |
509 | if (smp_use_sigp_detection) |
510 | return smp_rescan_cpus_sigp(avail); | |
511 | else | |
512 | return smp_rescan_cpus_sclp(avail); | |
1da177e4 LT |
513 | } |
514 | ||
48483b32 HC |
515 | static void __init smp_detect_cpus(void) |
516 | { | |
517 | unsigned int cpu, c_cpus, s_cpus; | |
518 | struct sclp_cpu_info *info; | |
519 | u16 boot_cpu_addr, cpu_addr; | |
520 | ||
521 | c_cpus = 1; | |
522 | s_cpus = 0; | |
523 | boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr; | |
524 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
525 | if (!info) | |
526 | panic("smp_detect_cpus failed to allocate memory\n"); | |
527 | /* Use sigp detection algorithm if sclp doesn't work. */ | |
528 | if (sclp_get_cpu_info(info)) { | |
529 | smp_use_sigp_detection = 1; | |
530 | for (cpu = 0; cpu <= 65535; cpu++) { | |
531 | if (cpu == boot_cpu_addr) | |
532 | continue; | |
533 | __cpu_logical_map[CPU_INIT_NO] = cpu; | |
534 | if (!cpu_stopped(CPU_INIT_NO)) | |
535 | continue; | |
536 | smp_get_save_area(c_cpus, cpu); | |
537 | c_cpus++; | |
538 | } | |
539 | goto out; | |
540 | } | |
541 | ||
542 | if (info->has_cpu_type) { | |
543 | for (cpu = 0; cpu < info->combined; cpu++) { | |
544 | if (info->cpu[cpu].address == boot_cpu_addr) { | |
545 | smp_cpu_type = info->cpu[cpu].type; | |
546 | break; | |
547 | } | |
548 | } | |
549 | } | |
550 | ||
551 | for (cpu = 0; cpu < info->combined; cpu++) { | |
552 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) | |
553 | continue; | |
554 | cpu_addr = info->cpu[cpu].address; | |
555 | if (cpu_addr == boot_cpu_addr) | |
556 | continue; | |
557 | __cpu_logical_map[CPU_INIT_NO] = cpu_addr; | |
558 | if (!cpu_stopped(CPU_INIT_NO)) { | |
559 | s_cpus++; | |
560 | continue; | |
561 | } | |
562 | smp_get_save_area(c_cpus, cpu_addr); | |
563 | c_cpus++; | |
564 | } | |
565 | out: | |
566 | kfree(info); | |
567 | printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus); | |
9d40d2e3 | 568 | get_online_cpus(); |
48483b32 | 569 | smp_rescan_cpus(); |
9d40d2e3 | 570 | put_online_cpus(); |
48483b32 HC |
571 | } |
572 | ||
1da177e4 | 573 | /* |
39ce010d | 574 | * Activate a secondary processor. |
1da177e4 | 575 | */ |
ea1f4eec | 576 | int __cpuinit start_secondary(void *cpuvoid) |
1da177e4 | 577 | { |
39ce010d HC |
578 | /* Setup the cpu */ |
579 | cpu_init(); | |
5bfb5d69 | 580 | preempt_disable(); |
d54853ef | 581 | /* Enable TOD clock interrupts on the secondary cpu. */ |
39ce010d | 582 | init_cpu_timer(); |
1da177e4 | 583 | #ifdef CONFIG_VIRT_TIMER |
d54853ef | 584 | /* Enable cpu timer interrupts on the secondary cpu. */ |
39ce010d | 585 | init_cpu_vtimer(); |
1da177e4 | 586 | #endif |
1da177e4 | 587 | /* Enable pfault pseudo page faults on this cpu. */ |
29b08d2b HC |
588 | pfault_init(); |
589 | ||
1da177e4 LT |
590 | /* Mark this cpu as online */ |
591 | cpu_set(smp_processor_id(), cpu_online_map); | |
592 | /* Switch on interrupts */ | |
593 | local_irq_enable(); | |
39ce010d HC |
594 | /* Print info about this processor */ |
595 | print_cpu_info(&S390_lowcore.cpu_data); | |
596 | /* cpu_idle will call schedule for us */ | |
597 | cpu_idle(); | |
598 | return 0; | |
1da177e4 LT |
599 | } |
600 | ||
601 | static void __init smp_create_idle(unsigned int cpu) | |
602 | { | |
603 | struct task_struct *p; | |
604 | ||
605 | /* | |
606 | * don't care about the psw and regs settings since we'll never | |
607 | * reschedule the forked task. | |
608 | */ | |
609 | p = fork_idle(cpu); | |
610 | if (IS_ERR(p)) | |
611 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); | |
612 | current_set[cpu] = p; | |
fae8b22d | 613 | spin_lock_init(&(&per_cpu(s390_idle, cpu))->lock); |
1da177e4 LT |
614 | } |
615 | ||
1cb6bb4b HC |
616 | static int __cpuinit smp_alloc_lowcore(int cpu) |
617 | { | |
618 | unsigned long async_stack, panic_stack; | |
619 | struct _lowcore *lowcore; | |
620 | int lc_order; | |
621 | ||
622 | lc_order = sizeof(long) == 8 ? 1 : 0; | |
623 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, lc_order); | |
624 | if (!lowcore) | |
625 | return -ENOMEM; | |
626 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); | |
1cb6bb4b | 627 | panic_stack = __get_free_page(GFP_KERNEL); |
591bb4f6 HC |
628 | if (!panic_stack || !async_stack) |
629 | goto out; | |
98c7b388 HC |
630 | memcpy(lowcore, &S390_lowcore, 512); |
631 | memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512); | |
1cb6bb4b HC |
632 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
633 | lowcore->panic_stack = panic_stack + PAGE_SIZE; | |
634 | ||
635 | #ifndef CONFIG_64BIT | |
636 | if (MACHINE_HAS_IEEE) { | |
637 | unsigned long save_area; | |
638 | ||
639 | save_area = get_zeroed_page(GFP_KERNEL); | |
640 | if (!save_area) | |
641 | goto out_save_area; | |
642 | lowcore->extended_save_area_addr = (u32) save_area; | |
643 | } | |
644 | #endif | |
645 | lowcore_ptr[cpu] = lowcore; | |
646 | return 0; | |
647 | ||
648 | #ifndef CONFIG_64BIT | |
649 | out_save_area: | |
650 | free_page(panic_stack); | |
651 | #endif | |
591bb4f6 | 652 | out: |
1cb6bb4b | 653 | free_pages(async_stack, ASYNC_ORDER); |
1cb6bb4b HC |
654 | free_pages((unsigned long) lowcore, lc_order); |
655 | return -ENOMEM; | |
656 | } | |
657 | ||
658 | #ifdef CONFIG_HOTPLUG_CPU | |
659 | static void smp_free_lowcore(int cpu) | |
660 | { | |
661 | struct _lowcore *lowcore; | |
662 | int lc_order; | |
663 | ||
664 | lc_order = sizeof(long) == 8 ? 1 : 0; | |
665 | lowcore = lowcore_ptr[cpu]; | |
666 | #ifndef CONFIG_64BIT | |
667 | if (MACHINE_HAS_IEEE) | |
668 | free_page((unsigned long) lowcore->extended_save_area_addr); | |
669 | #endif | |
670 | free_page(lowcore->panic_stack - PAGE_SIZE); | |
671 | free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER); | |
672 | free_pages((unsigned long) lowcore, lc_order); | |
673 | lowcore_ptr[cpu] = NULL; | |
674 | } | |
675 | #endif /* CONFIG_HOTPLUG_CPU */ | |
676 | ||
1da177e4 | 677 | /* Upping and downing of CPUs */ |
1cb6bb4b | 678 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 LT |
679 | { |
680 | struct task_struct *idle; | |
39ce010d | 681 | struct _lowcore *cpu_lowcore; |
1da177e4 | 682 | struct stack_frame *sf; |
39ce010d | 683 | sigp_ccode ccode; |
1da177e4 | 684 | |
08d07968 HC |
685 | if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) |
686 | return -EIO; | |
1cb6bb4b HC |
687 | if (smp_alloc_lowcore(cpu)) |
688 | return -ENOMEM; | |
1da177e4 LT |
689 | |
690 | ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]), | |
691 | cpu, sigp_set_prefix); | |
39ce010d | 692 | if (ccode) { |
1da177e4 LT |
693 | printk("sigp_set_prefix failed for cpu %d " |
694 | "with condition code %d\n", | |
695 | (int) cpu, (int) ccode); | |
696 | return -EIO; | |
697 | } | |
698 | ||
699 | idle = current_set[cpu]; | |
39ce010d | 700 | cpu_lowcore = lowcore_ptr[cpu]; |
1da177e4 | 701 | cpu_lowcore->kernel_stack = (unsigned long) |
39ce010d | 702 | task_stack_page(idle) + THREAD_SIZE; |
1cb6bb4b | 703 | cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle); |
1da177e4 LT |
704 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
705 | - sizeof(struct pt_regs) | |
706 | - sizeof(struct stack_frame)); | |
707 | memset(sf, 0, sizeof(struct stack_frame)); | |
708 | sf->gprs[9] = (unsigned long) sf; | |
709 | cpu_lowcore->save_area[15] = (unsigned long) sf; | |
710 | __ctl_store(cpu_lowcore->cregs_save_area[0], 0, 15); | |
94c12cc7 MS |
711 | asm volatile( |
712 | " stam 0,15,0(%0)" | |
713 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); | |
1da177e4 | 714 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
39ce010d HC |
715 | cpu_lowcore->current_task = (unsigned long) idle; |
716 | cpu_lowcore->cpu_data.cpu_nr = cpu; | |
591bb4f6 HC |
717 | cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce; |
718 | cpu_lowcore->ipl_device = S390_lowcore.ipl_device; | |
1da177e4 | 719 | eieio(); |
699ff13f | 720 | |
39ce010d | 721 | while (signal_processor(cpu, sigp_restart) == sigp_busy) |
699ff13f | 722 | udelay(10); |
1da177e4 LT |
723 | |
724 | while (!cpu_online(cpu)) | |
725 | cpu_relax(); | |
726 | return 0; | |
727 | } | |
728 | ||
48483b32 | 729 | static int __init setup_possible_cpus(char *s) |
255acee7 | 730 | { |
48483b32 | 731 | int pcpus, cpu; |
255acee7 | 732 | |
48483b32 HC |
733 | pcpus = simple_strtoul(s, NULL, 0); |
734 | cpu_possible_map = cpumask_of_cpu(0); | |
735 | for (cpu = 1; cpu < pcpus && cpu < NR_CPUS; cpu++) | |
255acee7 | 736 | cpu_set(cpu, cpu_possible_map); |
37a33026 HC |
737 | return 0; |
738 | } | |
739 | early_param("possible_cpus", setup_possible_cpus); | |
740 | ||
48483b32 HC |
741 | #ifdef CONFIG_HOTPLUG_CPU |
742 | ||
39ce010d | 743 | int __cpu_disable(void) |
1da177e4 | 744 | { |
94c12cc7 | 745 | struct ec_creg_mask_parms cr_parms; |
f3705136 | 746 | int cpu = smp_processor_id(); |
1da177e4 | 747 | |
f3705136 | 748 | cpu_clear(cpu, cpu_online_map); |
1da177e4 | 749 | |
1da177e4 | 750 | /* Disable pfault pseudo page faults on this cpu. */ |
29b08d2b | 751 | pfault_fini(); |
1da177e4 | 752 | |
94c12cc7 MS |
753 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
754 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); | |
1da177e4 | 755 | |
94c12cc7 | 756 | /* disable all external interrupts */ |
1da177e4 | 757 | cr_parms.orvals[0] = 0; |
39ce010d HC |
758 | cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 | |
759 | 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4); | |
1da177e4 | 760 | /* disable all I/O interrupts */ |
1da177e4 | 761 | cr_parms.orvals[6] = 0; |
39ce010d HC |
762 | cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | |
763 | 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); | |
1da177e4 | 764 | /* disable most machine checks */ |
1da177e4 | 765 | cr_parms.orvals[14] = 0; |
39ce010d HC |
766 | cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | |
767 | 1 << 25 | 1 << 24); | |
94c12cc7 | 768 | |
1da177e4 LT |
769 | smp_ctl_bit_callback(&cr_parms); |
770 | ||
1da177e4 LT |
771 | return 0; |
772 | } | |
773 | ||
39ce010d | 774 | void __cpu_die(unsigned int cpu) |
1da177e4 LT |
775 | { |
776 | /* Wait until target cpu is down */ | |
777 | while (!smp_cpu_not_running(cpu)) | |
778 | cpu_relax(); | |
1cb6bb4b | 779 | smp_free_lowcore(cpu); |
08d07968 | 780 | printk(KERN_INFO "Processor %d spun down\n", cpu); |
1da177e4 LT |
781 | } |
782 | ||
39ce010d | 783 | void cpu_die(void) |
1da177e4 LT |
784 | { |
785 | idle_task_exit(); | |
786 | signal_processor(smp_processor_id(), sigp_stop); | |
787 | BUG(); | |
39ce010d | 788 | for (;;); |
1da177e4 LT |
789 | } |
790 | ||
255acee7 HC |
791 | #endif /* CONFIG_HOTPLUG_CPU */ |
792 | ||
1da177e4 LT |
793 | void __init smp_prepare_cpus(unsigned int max_cpus) |
794 | { | |
591bb4f6 HC |
795 | #ifndef CONFIG_64BIT |
796 | unsigned long save_area = 0; | |
797 | #endif | |
798 | unsigned long async_stack, panic_stack; | |
799 | struct _lowcore *lowcore; | |
1da177e4 | 800 | unsigned int cpu; |
591bb4f6 | 801 | int lc_order; |
39ce010d | 802 | |
48483b32 HC |
803 | smp_detect_cpus(); |
804 | ||
39ce010d HC |
805 | /* request the 0x1201 emergency signal external interrupt */ |
806 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) | |
807 | panic("Couldn't request external interrupt 0x1201"); | |
1da177e4 LT |
808 | print_cpu_info(&S390_lowcore.cpu_data); |
809 | ||
591bb4f6 HC |
810 | /* Reallocate current lowcore, but keep its contents. */ |
811 | lc_order = sizeof(long) == 8 ? 1 : 0; | |
812 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, lc_order); | |
813 | panic_stack = __get_free_page(GFP_KERNEL); | |
814 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); | |
347a8dc3 | 815 | #ifndef CONFIG_64BIT |
77fa2245 | 816 | if (MACHINE_HAS_IEEE) |
591bb4f6 | 817 | save_area = get_zeroed_page(GFP_KERNEL); |
77fa2245 | 818 | #endif |
591bb4f6 HC |
819 | local_irq_disable(); |
820 | local_mcck_disable(); | |
821 | lowcore_ptr[smp_processor_id()] = lowcore; | |
822 | *lowcore = S390_lowcore; | |
823 | lowcore->panic_stack = panic_stack + PAGE_SIZE; | |
824 | lowcore->async_stack = async_stack + ASYNC_SIZE; | |
825 | #ifndef CONFIG_64BIT | |
826 | if (MACHINE_HAS_IEEE) | |
827 | lowcore->extended_save_area_addr = (u32) save_area; | |
828 | #endif | |
829 | set_prefix((u32)(unsigned long) lowcore); | |
830 | local_mcck_enable(); | |
831 | local_irq_enable(); | |
97db7fbf | 832 | for_each_possible_cpu(cpu) |
1da177e4 LT |
833 | if (cpu != smp_processor_id()) |
834 | smp_create_idle(cpu); | |
835 | } | |
836 | ||
ea1f4eec | 837 | void __init smp_prepare_boot_cpu(void) |
1da177e4 LT |
838 | { |
839 | BUG_ON(smp_processor_id() != 0); | |
840 | ||
48483b32 HC |
841 | current_thread_info()->cpu = 0; |
842 | cpu_set(0, cpu_present_map); | |
1da177e4 | 843 | cpu_set(0, cpu_online_map); |
1da177e4 LT |
844 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
845 | current_set[0] = current; | |
08d07968 | 846 | smp_cpu_state[0] = CPU_STATE_CONFIGURED; |
fae8b22d | 847 | spin_lock_init(&(&__get_cpu_var(s390_idle))->lock); |
1da177e4 LT |
848 | } |
849 | ||
ea1f4eec | 850 | void __init smp_cpus_done(unsigned int max_cpus) |
1da177e4 | 851 | { |
1da177e4 LT |
852 | } |
853 | ||
854 | /* | |
855 | * the frequency of the profiling timer can be changed | |
856 | * by writing a multiplier value into /proc/profile. | |
857 | * | |
858 | * usually you want to run this on all CPUs ;) | |
859 | */ | |
860 | int setup_profiling_timer(unsigned int multiplier) | |
861 | { | |
39ce010d | 862 | return 0; |
1da177e4 LT |
863 | } |
864 | ||
08d07968 HC |
865 | #ifdef CONFIG_HOTPLUG_CPU |
866 | static ssize_t cpu_configure_show(struct sys_device *dev, char *buf) | |
867 | { | |
868 | ssize_t count; | |
869 | ||
870 | mutex_lock(&smp_cpu_state_mutex); | |
871 | count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); | |
872 | mutex_unlock(&smp_cpu_state_mutex); | |
873 | return count; | |
874 | } | |
875 | ||
876 | static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf, | |
877 | size_t count) | |
878 | { | |
879 | int cpu = dev->id; | |
880 | int val, rc; | |
881 | char delim; | |
882 | ||
883 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
884 | return -EINVAL; | |
885 | if (val != 0 && val != 1) | |
886 | return -EINVAL; | |
887 | ||
888 | mutex_lock(&smp_cpu_state_mutex); | |
9d40d2e3 | 889 | get_online_cpus(); |
08d07968 HC |
890 | rc = -EBUSY; |
891 | if (cpu_online(cpu)) | |
892 | goto out; | |
893 | rc = 0; | |
894 | switch (val) { | |
895 | case 0: | |
896 | if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { | |
897 | rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); | |
898 | if (!rc) | |
899 | smp_cpu_state[cpu] = CPU_STATE_STANDBY; | |
900 | } | |
901 | break; | |
902 | case 1: | |
903 | if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { | |
904 | rc = sclp_cpu_configure(__cpu_logical_map[cpu]); | |
905 | if (!rc) | |
906 | smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; | |
907 | } | |
908 | break; | |
909 | default: | |
910 | break; | |
911 | } | |
912 | out: | |
9d40d2e3 | 913 | put_online_cpus(); |
08d07968 HC |
914 | mutex_unlock(&smp_cpu_state_mutex); |
915 | return rc ? rc : count; | |
916 | } | |
917 | static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); | |
918 | #endif /* CONFIG_HOTPLUG_CPU */ | |
919 | ||
920 | static ssize_t show_cpu_address(struct sys_device *dev, char *buf) | |
921 | { | |
922 | return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); | |
923 | } | |
924 | static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL); | |
925 | ||
926 | ||
927 | static struct attribute *cpu_common_attrs[] = { | |
928 | #ifdef CONFIG_HOTPLUG_CPU | |
929 | &attr_configure.attr, | |
930 | #endif | |
931 | &attr_address.attr, | |
932 | NULL, | |
933 | }; | |
934 | ||
935 | static struct attribute_group cpu_common_attr_group = { | |
936 | .attrs = cpu_common_attrs, | |
937 | }; | |
1da177e4 | 938 | |
2fc2d1e9 HC |
939 | static ssize_t show_capability(struct sys_device *dev, char *buf) |
940 | { | |
941 | unsigned int capability; | |
942 | int rc; | |
943 | ||
944 | rc = get_cpu_capability(&capability); | |
945 | if (rc) | |
946 | return rc; | |
947 | return sprintf(buf, "%u\n", capability); | |
948 | } | |
949 | static SYSDEV_ATTR(capability, 0444, show_capability, NULL); | |
950 | ||
fae8b22d HC |
951 | static ssize_t show_idle_count(struct sys_device *dev, char *buf) |
952 | { | |
953 | struct s390_idle_data *idle; | |
954 | unsigned long long idle_count; | |
955 | ||
956 | idle = &per_cpu(s390_idle, dev->id); | |
957 | spin_lock_irq(&idle->lock); | |
958 | idle_count = idle->idle_count; | |
959 | spin_unlock_irq(&idle->lock); | |
960 | return sprintf(buf, "%llu\n", idle_count); | |
961 | } | |
962 | static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); | |
963 | ||
964 | static ssize_t show_idle_time(struct sys_device *dev, char *buf) | |
965 | { | |
966 | struct s390_idle_data *idle; | |
967 | unsigned long long new_time; | |
968 | ||
969 | idle = &per_cpu(s390_idle, dev->id); | |
970 | spin_lock_irq(&idle->lock); | |
971 | if (idle->in_idle) { | |
972 | new_time = get_clock(); | |
973 | idle->idle_time += new_time - idle->idle_enter; | |
974 | idle->idle_enter = new_time; | |
975 | } | |
976 | new_time = idle->idle_time; | |
977 | spin_unlock_irq(&idle->lock); | |
69d39d66 | 978 | return sprintf(buf, "%llu\n", new_time >> 12); |
fae8b22d | 979 | } |
69d39d66 | 980 | static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); |
fae8b22d | 981 | |
08d07968 | 982 | static struct attribute *cpu_online_attrs[] = { |
fae8b22d HC |
983 | &attr_capability.attr, |
984 | &attr_idle_count.attr, | |
69d39d66 | 985 | &attr_idle_time_us.attr, |
fae8b22d HC |
986 | NULL, |
987 | }; | |
988 | ||
08d07968 HC |
989 | static struct attribute_group cpu_online_attr_group = { |
990 | .attrs = cpu_online_attrs, | |
fae8b22d HC |
991 | }; |
992 | ||
2fc2d1e9 HC |
993 | static int __cpuinit smp_cpu_notify(struct notifier_block *self, |
994 | unsigned long action, void *hcpu) | |
995 | { | |
996 | unsigned int cpu = (unsigned int)(long)hcpu; | |
997 | struct cpu *c = &per_cpu(cpu_devices, cpu); | |
998 | struct sys_device *s = &c->sysdev; | |
fae8b22d | 999 | struct s390_idle_data *idle; |
2fc2d1e9 HC |
1000 | |
1001 | switch (action) { | |
1002 | case CPU_ONLINE: | |
8bb78442 | 1003 | case CPU_ONLINE_FROZEN: |
fae8b22d HC |
1004 | idle = &per_cpu(s390_idle, cpu); |
1005 | spin_lock_irq(&idle->lock); | |
1006 | idle->idle_enter = 0; | |
1007 | idle->idle_time = 0; | |
1008 | idle->idle_count = 0; | |
1009 | spin_unlock_irq(&idle->lock); | |
08d07968 | 1010 | if (sysfs_create_group(&s->kobj, &cpu_online_attr_group)) |
2fc2d1e9 HC |
1011 | return NOTIFY_BAD; |
1012 | break; | |
1013 | case CPU_DEAD: | |
8bb78442 | 1014 | case CPU_DEAD_FROZEN: |
08d07968 | 1015 | sysfs_remove_group(&s->kobj, &cpu_online_attr_group); |
2fc2d1e9 HC |
1016 | break; |
1017 | } | |
1018 | return NOTIFY_OK; | |
1019 | } | |
1020 | ||
1021 | static struct notifier_block __cpuinitdata smp_cpu_nb = { | |
39ce010d | 1022 | .notifier_call = smp_cpu_notify, |
2fc2d1e9 HC |
1023 | }; |
1024 | ||
2bc89b5e | 1025 | static int __devinit smp_add_present_cpu(int cpu) |
08d07968 HC |
1026 | { |
1027 | struct cpu *c = &per_cpu(cpu_devices, cpu); | |
1028 | struct sys_device *s = &c->sysdev; | |
1029 | int rc; | |
1030 | ||
1031 | c->hotpluggable = 1; | |
1032 | rc = register_cpu(c, cpu); | |
1033 | if (rc) | |
1034 | goto out; | |
1035 | rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group); | |
1036 | if (rc) | |
1037 | goto out_cpu; | |
1038 | if (!cpu_online(cpu)) | |
1039 | goto out; | |
1040 | rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); | |
1041 | if (!rc) | |
1042 | return 0; | |
1043 | sysfs_remove_group(&s->kobj, &cpu_common_attr_group); | |
1044 | out_cpu: | |
1045 | #ifdef CONFIG_HOTPLUG_CPU | |
1046 | unregister_cpu(c); | |
1047 | #endif | |
1048 | out: | |
1049 | return rc; | |
1050 | } | |
1051 | ||
1052 | #ifdef CONFIG_HOTPLUG_CPU | |
2bc89b5e HC |
1053 | static ssize_t __ref rescan_store(struct sys_device *dev, |
1054 | const char *buf, size_t count) | |
08d07968 HC |
1055 | { |
1056 | cpumask_t newcpus; | |
1057 | int cpu; | |
1058 | int rc; | |
1059 | ||
1060 | mutex_lock(&smp_cpu_state_mutex); | |
9d40d2e3 | 1061 | get_online_cpus(); |
08d07968 HC |
1062 | newcpus = cpu_present_map; |
1063 | rc = smp_rescan_cpus(); | |
1064 | if (rc) | |
1065 | goto out; | |
1066 | cpus_andnot(newcpus, cpu_present_map, newcpus); | |
1067 | for_each_cpu_mask(cpu, newcpus) { | |
1068 | rc = smp_add_present_cpu(cpu); | |
1069 | if (rc) | |
1070 | cpu_clear(cpu, cpu_present_map); | |
1071 | } | |
1072 | rc = 0; | |
1073 | out: | |
9d40d2e3 | 1074 | put_online_cpus(); |
08d07968 HC |
1075 | mutex_unlock(&smp_cpu_state_mutex); |
1076 | return rc ? rc : count; | |
1077 | } | |
1078 | static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store); | |
1079 | #endif /* CONFIG_HOTPLUG_CPU */ | |
1080 | ||
1da177e4 LT |
1081 | static int __init topology_init(void) |
1082 | { | |
1083 | int cpu; | |
fae8b22d | 1084 | int rc; |
2fc2d1e9 HC |
1085 | |
1086 | register_cpu_notifier(&smp_cpu_nb); | |
1da177e4 | 1087 | |
08d07968 HC |
1088 | #ifdef CONFIG_HOTPLUG_CPU |
1089 | rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj, | |
1090 | &attr_rescan.attr); | |
1091 | if (rc) | |
1092 | return rc; | |
1093 | #endif | |
1094 | for_each_present_cpu(cpu) { | |
1095 | rc = smp_add_present_cpu(cpu); | |
fae8b22d HC |
1096 | if (rc) |
1097 | return rc; | |
1da177e4 LT |
1098 | } |
1099 | return 0; | |
1100 | } | |
1da177e4 | 1101 | subsys_initcall(topology_init); |