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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 | ||
395d31d4 MS |
23 | #define KMSG_COMPONENT "cpu" |
24 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
25 | ||
1da177e4 LT |
26 | #include <linux/module.h> |
27 | #include <linux/init.h> | |
1da177e4 | 28 | #include <linux/mm.h> |
4e950f6f | 29 | #include <linux/err.h> |
1da177e4 LT |
30 | #include <linux/spinlock.h> |
31 | #include <linux/kernel_stat.h> | |
1da177e4 LT |
32 | #include <linux/delay.h> |
33 | #include <linux/cache.h> | |
34 | #include <linux/interrupt.h> | |
3324e60a | 35 | #include <linux/irqflags.h> |
1da177e4 | 36 | #include <linux/cpu.h> |
2b67fc46 | 37 | #include <linux/timex.h> |
411ed322 | 38 | #include <linux/bootmem.h> |
46b05d26 | 39 | #include <asm/ipl.h> |
2b67fc46 | 40 | #include <asm/setup.h> |
1da177e4 LT |
41 | #include <asm/sigp.h> |
42 | #include <asm/pgalloc.h> | |
43 | #include <asm/irq.h> | |
44 | #include <asm/s390_ext.h> | |
45 | #include <asm/cpcmd.h> | |
46 | #include <asm/tlbflush.h> | |
2b67fc46 | 47 | #include <asm/timer.h> |
411ed322 | 48 | #include <asm/lowcore.h> |
08d07968 | 49 | #include <asm/sclp.h> |
fae8b22d | 50 | #include <asm/cpu.h> |
c742b31c | 51 | #include <asm/vdso.h> |
a806170e | 52 | #include "entry.h" |
1da177e4 | 53 | |
1da177e4 LT |
54 | static struct task_struct *current_set[NR_CPUS]; |
55 | ||
08d07968 HC |
56 | static u8 smp_cpu_type; |
57 | static int smp_use_sigp_detection; | |
58 | ||
59 | enum s390_cpu_state { | |
60 | CPU_STATE_STANDBY, | |
61 | CPU_STATE_CONFIGURED, | |
62 | }; | |
63 | ||
dbd70fb4 | 64 | DEFINE_MUTEX(smp_cpu_state_mutex); |
c10fde0d | 65 | int smp_cpu_polarization[NR_CPUS]; |
08d07968 | 66 | static int smp_cpu_state[NR_CPUS]; |
c10fde0d | 67 | static int cpu_management; |
08d07968 HC |
68 | |
69 | static DEFINE_PER_CPU(struct cpu, cpu_devices); | |
08d07968 | 70 | |
1da177e4 | 71 | static void smp_ext_bitcall(int, ec_bit_sig); |
1da177e4 | 72 | |
677d7623 | 73 | void smp_send_stop(void) |
1da177e4 | 74 | { |
39ce010d | 75 | int cpu, rc; |
1da177e4 | 76 | |
677d7623 HC |
77 | /* Disable all interrupts/machine checks */ |
78 | __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); | |
3324e60a | 79 | trace_hardirqs_off(); |
1da177e4 | 80 | |
677d7623 | 81 | /* stop all processors */ |
1da177e4 LT |
82 | for_each_online_cpu(cpu) { |
83 | if (cpu == smp_processor_id()) | |
84 | continue; | |
85 | do { | |
677d7623 | 86 | rc = signal_processor(cpu, sigp_stop); |
39ce010d | 87 | } while (rc == sigp_busy); |
1da177e4 | 88 | |
39ce010d | 89 | while (!smp_cpu_not_running(cpu)) |
c6b5b847 HC |
90 | cpu_relax(); |
91 | } | |
92 | } | |
93 | ||
1da177e4 LT |
94 | /* |
95 | * This is the main routine where commands issued by other | |
96 | * cpus are handled. | |
97 | */ | |
98 | ||
2b67fc46 | 99 | static void do_ext_call_interrupt(__u16 code) |
1da177e4 | 100 | { |
39ce010d | 101 | unsigned long bits; |
1da177e4 | 102 | |
39ce010d HC |
103 | /* |
104 | * handle bit signal external calls | |
105 | * | |
106 | * For the ec_schedule signal we have to do nothing. All the work | |
107 | * is done automatically when we return from the interrupt. | |
108 | */ | |
1da177e4 LT |
109 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
110 | ||
39ce010d | 111 | if (test_bit(ec_call_function, &bits)) |
ca9fc75a HC |
112 | generic_smp_call_function_interrupt(); |
113 | ||
114 | if (test_bit(ec_call_function_single, &bits)) | |
115 | generic_smp_call_function_single_interrupt(); | |
1da177e4 LT |
116 | } |
117 | ||
118 | /* | |
119 | * Send an external call sigp to another cpu and return without waiting | |
120 | * for its completion. | |
121 | */ | |
122 | static void smp_ext_bitcall(int cpu, ec_bit_sig sig) | |
123 | { | |
39ce010d HC |
124 | /* |
125 | * Set signaling bit in lowcore of target cpu and kick it | |
126 | */ | |
1da177e4 | 127 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
39ce010d | 128 | while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) |
1da177e4 LT |
129 | udelay(10); |
130 | } | |
131 | ||
ca9fc75a HC |
132 | void arch_send_call_function_ipi(cpumask_t mask) |
133 | { | |
134 | int cpu; | |
135 | ||
136 | for_each_cpu_mask(cpu, mask) | |
137 | smp_ext_bitcall(cpu, ec_call_function); | |
138 | } | |
139 | ||
140 | void arch_send_call_function_single_ipi(int cpu) | |
141 | { | |
142 | smp_ext_bitcall(cpu, ec_call_function_single); | |
143 | } | |
144 | ||
347a8dc3 | 145 | #ifndef CONFIG_64BIT |
1da177e4 LT |
146 | /* |
147 | * this function sends a 'purge tlb' signal to another CPU. | |
148 | */ | |
a806170e | 149 | static void smp_ptlb_callback(void *info) |
1da177e4 | 150 | { |
ba8a9229 | 151 | __tlb_flush_local(); |
1da177e4 LT |
152 | } |
153 | ||
154 | void smp_ptlb_all(void) | |
155 | { | |
15c8b6c1 | 156 | on_each_cpu(smp_ptlb_callback, NULL, 1); |
1da177e4 LT |
157 | } |
158 | EXPORT_SYMBOL(smp_ptlb_all); | |
347a8dc3 | 159 | #endif /* ! CONFIG_64BIT */ |
1da177e4 LT |
160 | |
161 | /* | |
162 | * this function sends a 'reschedule' IPI to another CPU. | |
163 | * it goes straight through and wastes no time serializing | |
164 | * anything. Worst case is that we lose a reschedule ... | |
165 | */ | |
166 | void smp_send_reschedule(int cpu) | |
167 | { | |
39ce010d | 168 | smp_ext_bitcall(cpu, ec_schedule); |
1da177e4 LT |
169 | } |
170 | ||
171 | /* | |
172 | * parameter area for the set/clear control bit callbacks | |
173 | */ | |
94c12cc7 | 174 | struct ec_creg_mask_parms { |
1da177e4 LT |
175 | unsigned long orvals[16]; |
176 | unsigned long andvals[16]; | |
94c12cc7 | 177 | }; |
1da177e4 LT |
178 | |
179 | /* | |
180 | * callback for setting/clearing control bits | |
181 | */ | |
39ce010d HC |
182 | static void smp_ctl_bit_callback(void *info) |
183 | { | |
94c12cc7 | 184 | struct ec_creg_mask_parms *pp = info; |
1da177e4 LT |
185 | unsigned long cregs[16]; |
186 | int i; | |
39ce010d | 187 | |
94c12cc7 MS |
188 | __ctl_store(cregs, 0, 15); |
189 | for (i = 0; i <= 15; i++) | |
1da177e4 | 190 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
94c12cc7 | 191 | __ctl_load(cregs, 0, 15); |
1da177e4 LT |
192 | } |
193 | ||
194 | /* | |
195 | * Set a bit in a control register of all cpus | |
196 | */ | |
94c12cc7 MS |
197 | void smp_ctl_set_bit(int cr, int bit) |
198 | { | |
199 | struct ec_creg_mask_parms parms; | |
1da177e4 | 200 | |
94c12cc7 MS |
201 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
202 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); | |
1da177e4 | 203 | parms.orvals[cr] = 1 << bit; |
15c8b6c1 | 204 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
1da177e4 | 205 | } |
39ce010d | 206 | EXPORT_SYMBOL(smp_ctl_set_bit); |
1da177e4 LT |
207 | |
208 | /* | |
209 | * Clear a bit in a control register of all cpus | |
210 | */ | |
94c12cc7 MS |
211 | void smp_ctl_clear_bit(int cr, int bit) |
212 | { | |
213 | struct ec_creg_mask_parms parms; | |
1da177e4 | 214 | |
94c12cc7 MS |
215 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
216 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); | |
1da177e4 | 217 | parms.andvals[cr] = ~(1L << bit); |
15c8b6c1 | 218 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
1da177e4 | 219 | } |
39ce010d | 220 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
1da177e4 | 221 | |
08d07968 HC |
222 | /* |
223 | * In early ipl state a temp. logically cpu number is needed, so the sigp | |
224 | * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on | |
225 | * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1. | |
226 | */ | |
227 | #define CPU_INIT_NO 1 | |
228 | ||
59f2e69d | 229 | #ifdef CONFIG_ZFCPDUMP |
411ed322 MH |
230 | |
231 | /* | |
232 | * zfcpdump_prefix_array holds prefix registers for the following scenario: | |
233 | * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to | |
234 | * save its prefix registers, since they get lost, when switching from 31 bit | |
235 | * to 64 bit. | |
236 | */ | |
237 | unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \ | |
238 | __attribute__((__section__(".data"))); | |
239 | ||
285f6722 | 240 | static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) |
411ed322 | 241 | { |
411ed322 MH |
242 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
243 | return; | |
285f6722 | 244 | if (cpu >= NR_CPUS) { |
395d31d4 MS |
245 | pr_warning("CPU %i exceeds the maximum %i and is excluded from " |
246 | "the dump\n", cpu, NR_CPUS - 1); | |
285f6722 | 247 | return; |
411ed322 | 248 | } |
48483b32 | 249 | zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL); |
08d07968 HC |
250 | __cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu; |
251 | while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) == | |
252 | sigp_busy) | |
285f6722 HC |
253 | cpu_relax(); |
254 | memcpy(zfcpdump_save_areas[cpu], | |
255 | (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, | |
256 | SAVE_AREA_SIZE); | |
257 | #ifdef CONFIG_64BIT | |
258 | /* copy original prefix register */ | |
259 | zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu]; | |
260 | #endif | |
411ed322 MH |
261 | } |
262 | ||
263 | union save_area *zfcpdump_save_areas[NR_CPUS + 1]; | |
264 | EXPORT_SYMBOL_GPL(zfcpdump_save_areas); | |
265 | ||
266 | #else | |
285f6722 HC |
267 | |
268 | static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } | |
269 | ||
59f2e69d | 270 | #endif /* CONFIG_ZFCPDUMP */ |
411ed322 | 271 | |
08d07968 HC |
272 | static int cpu_stopped(int cpu) |
273 | { | |
274 | __u32 status; | |
275 | ||
276 | /* Check for stopped state */ | |
277 | if (signal_processor_ps(&status, 0, cpu, sigp_sense) == | |
278 | sigp_status_stored) { | |
279 | if (status & 0x40) | |
280 | return 1; | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
08d07968 HC |
285 | static int cpu_known(int cpu_id) |
286 | { | |
287 | int cpu; | |
288 | ||
289 | for_each_present_cpu(cpu) { | |
290 | if (__cpu_logical_map[cpu] == cpu_id) | |
291 | return 1; | |
292 | } | |
293 | return 0; | |
294 | } | |
295 | ||
296 | static int smp_rescan_cpus_sigp(cpumask_t avail) | |
297 | { | |
298 | int cpu_id, logical_cpu; | |
299 | ||
93632d1b RR |
300 | logical_cpu = cpumask_first(&avail); |
301 | if (logical_cpu >= nr_cpu_ids) | |
08d07968 HC |
302 | return 0; |
303 | for (cpu_id = 0; cpu_id <= 65535; cpu_id++) { | |
304 | if (cpu_known(cpu_id)) | |
305 | continue; | |
306 | __cpu_logical_map[logical_cpu] = cpu_id; | |
c10fde0d | 307 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
08d07968 HC |
308 | if (!cpu_stopped(logical_cpu)) |
309 | continue; | |
310 | cpu_set(logical_cpu, cpu_present_map); | |
311 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; | |
93632d1b RR |
312 | logical_cpu = cpumask_next(logical_cpu, &avail); |
313 | if (logical_cpu >= nr_cpu_ids) | |
08d07968 HC |
314 | break; |
315 | } | |
316 | return 0; | |
317 | } | |
318 | ||
48483b32 | 319 | static int smp_rescan_cpus_sclp(cpumask_t avail) |
08d07968 HC |
320 | { |
321 | struct sclp_cpu_info *info; | |
322 | int cpu_id, logical_cpu, cpu; | |
323 | int rc; | |
324 | ||
93632d1b RR |
325 | logical_cpu = cpumask_first(&avail); |
326 | if (logical_cpu >= nr_cpu_ids) | |
08d07968 | 327 | return 0; |
48483b32 | 328 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
08d07968 HC |
329 | if (!info) |
330 | return -ENOMEM; | |
331 | rc = sclp_get_cpu_info(info); | |
332 | if (rc) | |
333 | goto out; | |
334 | for (cpu = 0; cpu < info->combined; cpu++) { | |
335 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) | |
336 | continue; | |
337 | cpu_id = info->cpu[cpu].address; | |
338 | if (cpu_known(cpu_id)) | |
339 | continue; | |
340 | __cpu_logical_map[logical_cpu] = cpu_id; | |
c10fde0d | 341 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
08d07968 HC |
342 | cpu_set(logical_cpu, cpu_present_map); |
343 | if (cpu >= info->configured) | |
344 | smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; | |
345 | else | |
346 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; | |
93632d1b RR |
347 | logical_cpu = cpumask_next(logical_cpu, &avail); |
348 | if (logical_cpu >= nr_cpu_ids) | |
08d07968 HC |
349 | break; |
350 | } | |
351 | out: | |
48483b32 | 352 | kfree(info); |
08d07968 HC |
353 | return rc; |
354 | } | |
355 | ||
1e489518 | 356 | static int __smp_rescan_cpus(void) |
08d07968 HC |
357 | { |
358 | cpumask_t avail; | |
359 | ||
48483b32 | 360 | cpus_xor(avail, cpu_possible_map, cpu_present_map); |
08d07968 HC |
361 | if (smp_use_sigp_detection) |
362 | return smp_rescan_cpus_sigp(avail); | |
363 | else | |
364 | return smp_rescan_cpus_sclp(avail); | |
1da177e4 LT |
365 | } |
366 | ||
48483b32 HC |
367 | static void __init smp_detect_cpus(void) |
368 | { | |
369 | unsigned int cpu, c_cpus, s_cpus; | |
370 | struct sclp_cpu_info *info; | |
371 | u16 boot_cpu_addr, cpu_addr; | |
372 | ||
373 | c_cpus = 1; | |
374 | s_cpus = 0; | |
7b468488 | 375 | boot_cpu_addr = __cpu_logical_map[0]; |
48483b32 HC |
376 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
377 | if (!info) | |
378 | panic("smp_detect_cpus failed to allocate memory\n"); | |
379 | /* Use sigp detection algorithm if sclp doesn't work. */ | |
380 | if (sclp_get_cpu_info(info)) { | |
381 | smp_use_sigp_detection = 1; | |
382 | for (cpu = 0; cpu <= 65535; cpu++) { | |
383 | if (cpu == boot_cpu_addr) | |
384 | continue; | |
385 | __cpu_logical_map[CPU_INIT_NO] = cpu; | |
386 | if (!cpu_stopped(CPU_INIT_NO)) | |
387 | continue; | |
388 | smp_get_save_area(c_cpus, cpu); | |
389 | c_cpus++; | |
390 | } | |
391 | goto out; | |
392 | } | |
393 | ||
394 | if (info->has_cpu_type) { | |
395 | for (cpu = 0; cpu < info->combined; cpu++) { | |
396 | if (info->cpu[cpu].address == boot_cpu_addr) { | |
397 | smp_cpu_type = info->cpu[cpu].type; | |
398 | break; | |
399 | } | |
400 | } | |
401 | } | |
402 | ||
403 | for (cpu = 0; cpu < info->combined; cpu++) { | |
404 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) | |
405 | continue; | |
406 | cpu_addr = info->cpu[cpu].address; | |
407 | if (cpu_addr == boot_cpu_addr) | |
408 | continue; | |
409 | __cpu_logical_map[CPU_INIT_NO] = cpu_addr; | |
410 | if (!cpu_stopped(CPU_INIT_NO)) { | |
411 | s_cpus++; | |
412 | continue; | |
413 | } | |
414 | smp_get_save_area(c_cpus, cpu_addr); | |
415 | c_cpus++; | |
416 | } | |
417 | out: | |
418 | kfree(info); | |
395d31d4 | 419 | pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus); |
9d40d2e3 | 420 | get_online_cpus(); |
1e489518 | 421 | __smp_rescan_cpus(); |
9d40d2e3 | 422 | put_online_cpus(); |
48483b32 HC |
423 | } |
424 | ||
1da177e4 | 425 | /* |
39ce010d | 426 | * Activate a secondary processor. |
1da177e4 | 427 | */ |
ea1f4eec | 428 | int __cpuinit start_secondary(void *cpuvoid) |
1da177e4 | 429 | { |
39ce010d HC |
430 | /* Setup the cpu */ |
431 | cpu_init(); | |
5bfb5d69 | 432 | preempt_disable(); |
d54853ef | 433 | /* Enable TOD clock interrupts on the secondary cpu. */ |
39ce010d | 434 | init_cpu_timer(); |
d54853ef | 435 | /* Enable cpu timer interrupts on the secondary cpu. */ |
39ce010d | 436 | init_cpu_vtimer(); |
1da177e4 | 437 | /* Enable pfault pseudo page faults on this cpu. */ |
29b08d2b HC |
438 | pfault_init(); |
439 | ||
e545a614 MS |
440 | /* call cpu notifiers */ |
441 | notify_cpu_starting(smp_processor_id()); | |
1da177e4 | 442 | /* Mark this cpu as online */ |
ca9fc75a | 443 | ipi_call_lock(); |
1da177e4 | 444 | cpu_set(smp_processor_id(), cpu_online_map); |
ca9fc75a | 445 | ipi_call_unlock(); |
1da177e4 LT |
446 | /* Switch on interrupts */ |
447 | local_irq_enable(); | |
39ce010d | 448 | /* Print info about this processor */ |
7b468488 | 449 | print_cpu_info(); |
39ce010d HC |
450 | /* cpu_idle will call schedule for us */ |
451 | cpu_idle(); | |
452 | return 0; | |
1da177e4 LT |
453 | } |
454 | ||
455 | static void __init smp_create_idle(unsigned int cpu) | |
456 | { | |
457 | struct task_struct *p; | |
458 | ||
459 | /* | |
460 | * don't care about the psw and regs settings since we'll never | |
461 | * reschedule the forked task. | |
462 | */ | |
463 | p = fork_idle(cpu); | |
464 | if (IS_ERR(p)) | |
465 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); | |
466 | current_set[cpu] = p; | |
467 | } | |
468 | ||
1cb6bb4b HC |
469 | static int __cpuinit smp_alloc_lowcore(int cpu) |
470 | { | |
471 | unsigned long async_stack, panic_stack; | |
472 | struct _lowcore *lowcore; | |
473 | int lc_order; | |
474 | ||
475 | lc_order = sizeof(long) == 8 ? 1 : 0; | |
476 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, lc_order); | |
477 | if (!lowcore) | |
478 | return -ENOMEM; | |
479 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); | |
1cb6bb4b | 480 | panic_stack = __get_free_page(GFP_KERNEL); |
591bb4f6 HC |
481 | if (!panic_stack || !async_stack) |
482 | goto out; | |
98c7b388 HC |
483 | memcpy(lowcore, &S390_lowcore, 512); |
484 | memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512); | |
1cb6bb4b HC |
485 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
486 | lowcore->panic_stack = panic_stack + PAGE_SIZE; | |
487 | ||
488 | #ifndef CONFIG_64BIT | |
489 | if (MACHINE_HAS_IEEE) { | |
490 | unsigned long save_area; | |
491 | ||
492 | save_area = get_zeroed_page(GFP_KERNEL); | |
493 | if (!save_area) | |
33b1d09e | 494 | goto out; |
1cb6bb4b HC |
495 | lowcore->extended_save_area_addr = (u32) save_area; |
496 | } | |
c742b31c MS |
497 | #else |
498 | if (vdso_alloc_per_cpu(cpu, lowcore)) | |
499 | goto out; | |
1cb6bb4b HC |
500 | #endif |
501 | lowcore_ptr[cpu] = lowcore; | |
502 | return 0; | |
503 | ||
591bb4f6 | 504 | out: |
33b1d09e | 505 | free_page(panic_stack); |
1cb6bb4b | 506 | free_pages(async_stack, ASYNC_ORDER); |
1cb6bb4b HC |
507 | free_pages((unsigned long) lowcore, lc_order); |
508 | return -ENOMEM; | |
509 | } | |
510 | ||
1cb6bb4b HC |
511 | static void smp_free_lowcore(int cpu) |
512 | { | |
513 | struct _lowcore *lowcore; | |
514 | int lc_order; | |
515 | ||
516 | lc_order = sizeof(long) == 8 ? 1 : 0; | |
517 | lowcore = lowcore_ptr[cpu]; | |
518 | #ifndef CONFIG_64BIT | |
519 | if (MACHINE_HAS_IEEE) | |
520 | free_page((unsigned long) lowcore->extended_save_area_addr); | |
c742b31c MS |
521 | #else |
522 | vdso_free_per_cpu(cpu, lowcore); | |
1cb6bb4b HC |
523 | #endif |
524 | free_page(lowcore->panic_stack - PAGE_SIZE); | |
525 | free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER); | |
526 | free_pages((unsigned long) lowcore, lc_order); | |
527 | lowcore_ptr[cpu] = NULL; | |
528 | } | |
1cb6bb4b | 529 | |
1da177e4 | 530 | /* Upping and downing of CPUs */ |
1cb6bb4b | 531 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 LT |
532 | { |
533 | struct task_struct *idle; | |
39ce010d | 534 | struct _lowcore *cpu_lowcore; |
1da177e4 | 535 | struct stack_frame *sf; |
39ce010d | 536 | sigp_ccode ccode; |
d0d3cdf4 | 537 | u32 lowcore; |
1da177e4 | 538 | |
08d07968 HC |
539 | if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) |
540 | return -EIO; | |
1cb6bb4b HC |
541 | if (smp_alloc_lowcore(cpu)) |
542 | return -ENOMEM; | |
d0d3cdf4 HC |
543 | do { |
544 | ccode = signal_processor(cpu, sigp_initial_cpu_reset); | |
545 | if (ccode == sigp_busy) | |
546 | udelay(10); | |
547 | if (ccode == sigp_not_operational) | |
548 | goto err_out; | |
549 | } while (ccode == sigp_busy); | |
550 | ||
551 | lowcore = (u32)(unsigned long)lowcore_ptr[cpu]; | |
552 | while (signal_processor_p(lowcore, cpu, sigp_set_prefix) == sigp_busy) | |
553 | udelay(10); | |
1da177e4 LT |
554 | |
555 | idle = current_set[cpu]; | |
39ce010d | 556 | cpu_lowcore = lowcore_ptr[cpu]; |
1da177e4 | 557 | cpu_lowcore->kernel_stack = (unsigned long) |
39ce010d | 558 | task_stack_page(idle) + THREAD_SIZE; |
1cb6bb4b | 559 | cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle); |
1da177e4 LT |
560 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
561 | - sizeof(struct pt_regs) | |
562 | - sizeof(struct stack_frame)); | |
563 | memset(sf, 0, sizeof(struct stack_frame)); | |
564 | sf->gprs[9] = (unsigned long) sf; | |
565 | cpu_lowcore->save_area[15] = (unsigned long) sf; | |
24d3e210 | 566 | __ctl_store(cpu_lowcore->cregs_save_area, 0, 15); |
94c12cc7 MS |
567 | asm volatile( |
568 | " stam 0,15,0(%0)" | |
569 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); | |
1da177e4 | 570 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
39ce010d | 571 | cpu_lowcore->current_task = (unsigned long) idle; |
7b468488 | 572 | cpu_lowcore->cpu_nr = cpu; |
591bb4f6 | 573 | cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce; |
1da177e4 | 574 | eieio(); |
699ff13f | 575 | |
39ce010d | 576 | while (signal_processor(cpu, sigp_restart) == sigp_busy) |
699ff13f | 577 | udelay(10); |
1da177e4 LT |
578 | |
579 | while (!cpu_online(cpu)) | |
580 | cpu_relax(); | |
581 | return 0; | |
d0d3cdf4 HC |
582 | |
583 | err_out: | |
584 | smp_free_lowcore(cpu); | |
585 | return -EIO; | |
1da177e4 LT |
586 | } |
587 | ||
48483b32 | 588 | static int __init setup_possible_cpus(char *s) |
255acee7 | 589 | { |
48483b32 | 590 | int pcpus, cpu; |
255acee7 | 591 | |
48483b32 | 592 | pcpus = simple_strtoul(s, NULL, 0); |
def6cfb7 RR |
593 | for (cpu = 0; cpu < pcpus && cpu < nr_cpu_ids; cpu++) |
594 | set_cpu_possible(cpu, true); | |
37a33026 HC |
595 | return 0; |
596 | } | |
597 | early_param("possible_cpus", setup_possible_cpus); | |
598 | ||
48483b32 HC |
599 | #ifdef CONFIG_HOTPLUG_CPU |
600 | ||
39ce010d | 601 | int __cpu_disable(void) |
1da177e4 | 602 | { |
94c12cc7 | 603 | struct ec_creg_mask_parms cr_parms; |
f3705136 | 604 | int cpu = smp_processor_id(); |
1da177e4 | 605 | |
f3705136 | 606 | cpu_clear(cpu, cpu_online_map); |
1da177e4 | 607 | |
1da177e4 | 608 | /* Disable pfault pseudo page faults on this cpu. */ |
29b08d2b | 609 | pfault_fini(); |
1da177e4 | 610 | |
94c12cc7 MS |
611 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
612 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); | |
1da177e4 | 613 | |
94c12cc7 | 614 | /* disable all external interrupts */ |
1da177e4 | 615 | cr_parms.orvals[0] = 0; |
39ce010d HC |
616 | cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 | |
617 | 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4); | |
1da177e4 | 618 | /* disable all I/O interrupts */ |
1da177e4 | 619 | cr_parms.orvals[6] = 0; |
39ce010d HC |
620 | cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | |
621 | 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); | |
1da177e4 | 622 | /* disable most machine checks */ |
1da177e4 | 623 | cr_parms.orvals[14] = 0; |
39ce010d HC |
624 | cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | |
625 | 1 << 25 | 1 << 24); | |
94c12cc7 | 626 | |
1da177e4 LT |
627 | smp_ctl_bit_callback(&cr_parms); |
628 | ||
1da177e4 LT |
629 | return 0; |
630 | } | |
631 | ||
39ce010d | 632 | void __cpu_die(unsigned int cpu) |
1da177e4 LT |
633 | { |
634 | /* Wait until target cpu is down */ | |
635 | while (!smp_cpu_not_running(cpu)) | |
636 | cpu_relax(); | |
1cb6bb4b | 637 | smp_free_lowcore(cpu); |
395d31d4 | 638 | pr_info("Processor %d stopped\n", cpu); |
1da177e4 LT |
639 | } |
640 | ||
39ce010d | 641 | void cpu_die(void) |
1da177e4 LT |
642 | { |
643 | idle_task_exit(); | |
644 | signal_processor(smp_processor_id(), sigp_stop); | |
645 | BUG(); | |
39ce010d | 646 | for (;;); |
1da177e4 LT |
647 | } |
648 | ||
255acee7 HC |
649 | #endif /* CONFIG_HOTPLUG_CPU */ |
650 | ||
1da177e4 LT |
651 | void __init smp_prepare_cpus(unsigned int max_cpus) |
652 | { | |
591bb4f6 HC |
653 | #ifndef CONFIG_64BIT |
654 | unsigned long save_area = 0; | |
655 | #endif | |
656 | unsigned long async_stack, panic_stack; | |
657 | struct _lowcore *lowcore; | |
1da177e4 | 658 | unsigned int cpu; |
591bb4f6 | 659 | int lc_order; |
39ce010d | 660 | |
48483b32 HC |
661 | smp_detect_cpus(); |
662 | ||
39ce010d HC |
663 | /* request the 0x1201 emergency signal external interrupt */ |
664 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) | |
665 | panic("Couldn't request external interrupt 0x1201"); | |
7b468488 | 666 | print_cpu_info(); |
1da177e4 | 667 | |
591bb4f6 HC |
668 | /* Reallocate current lowcore, but keep its contents. */ |
669 | lc_order = sizeof(long) == 8 ? 1 : 0; | |
670 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, lc_order); | |
671 | panic_stack = __get_free_page(GFP_KERNEL); | |
672 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); | |
c742b31c | 673 | BUG_ON(!lowcore || !panic_stack || !async_stack); |
347a8dc3 | 674 | #ifndef CONFIG_64BIT |
77fa2245 | 675 | if (MACHINE_HAS_IEEE) |
591bb4f6 | 676 | save_area = get_zeroed_page(GFP_KERNEL); |
77fa2245 | 677 | #endif |
591bb4f6 HC |
678 | local_irq_disable(); |
679 | local_mcck_disable(); | |
680 | lowcore_ptr[smp_processor_id()] = lowcore; | |
681 | *lowcore = S390_lowcore; | |
682 | lowcore->panic_stack = panic_stack + PAGE_SIZE; | |
683 | lowcore->async_stack = async_stack + ASYNC_SIZE; | |
684 | #ifndef CONFIG_64BIT | |
685 | if (MACHINE_HAS_IEEE) | |
686 | lowcore->extended_save_area_addr = (u32) save_area; | |
c742b31c | 687 | #else |
81ffa041 HC |
688 | if (vdso_alloc_per_cpu(smp_processor_id(), lowcore)) |
689 | BUG(); | |
591bb4f6 HC |
690 | #endif |
691 | set_prefix((u32)(unsigned long) lowcore); | |
692 | local_mcck_enable(); | |
693 | local_irq_enable(); | |
97db7fbf | 694 | for_each_possible_cpu(cpu) |
1da177e4 LT |
695 | if (cpu != smp_processor_id()) |
696 | smp_create_idle(cpu); | |
697 | } | |
698 | ||
ea1f4eec | 699 | void __init smp_prepare_boot_cpu(void) |
1da177e4 LT |
700 | { |
701 | BUG_ON(smp_processor_id() != 0); | |
702 | ||
48483b32 HC |
703 | current_thread_info()->cpu = 0; |
704 | cpu_set(0, cpu_present_map); | |
1da177e4 | 705 | cpu_set(0, cpu_online_map); |
1da177e4 LT |
706 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
707 | current_set[0] = current; | |
08d07968 | 708 | smp_cpu_state[0] = CPU_STATE_CONFIGURED; |
c10fde0d | 709 | smp_cpu_polarization[0] = POLARIZATION_UNKNWN; |
1da177e4 LT |
710 | } |
711 | ||
ea1f4eec | 712 | void __init smp_cpus_done(unsigned int max_cpus) |
1da177e4 | 713 | { |
1da177e4 LT |
714 | } |
715 | ||
716 | /* | |
717 | * the frequency of the profiling timer can be changed | |
718 | * by writing a multiplier value into /proc/profile. | |
719 | * | |
720 | * usually you want to run this on all CPUs ;) | |
721 | */ | |
722 | int setup_profiling_timer(unsigned int multiplier) | |
723 | { | |
39ce010d | 724 | return 0; |
1da177e4 LT |
725 | } |
726 | ||
08d07968 | 727 | #ifdef CONFIG_HOTPLUG_CPU |
4a0b2b4d AK |
728 | static ssize_t cpu_configure_show(struct sys_device *dev, |
729 | struct sysdev_attribute *attr, char *buf) | |
08d07968 HC |
730 | { |
731 | ssize_t count; | |
732 | ||
733 | mutex_lock(&smp_cpu_state_mutex); | |
734 | count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); | |
735 | mutex_unlock(&smp_cpu_state_mutex); | |
736 | return count; | |
737 | } | |
738 | ||
4a0b2b4d AK |
739 | static ssize_t cpu_configure_store(struct sys_device *dev, |
740 | struct sysdev_attribute *attr, | |
741 | const char *buf, size_t count) | |
08d07968 HC |
742 | { |
743 | int cpu = dev->id; | |
744 | int val, rc; | |
745 | char delim; | |
746 | ||
747 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
748 | return -EINVAL; | |
749 | if (val != 0 && val != 1) | |
750 | return -EINVAL; | |
751 | ||
9d40d2e3 | 752 | get_online_cpus(); |
0b18d318 | 753 | mutex_lock(&smp_cpu_state_mutex); |
08d07968 HC |
754 | rc = -EBUSY; |
755 | if (cpu_online(cpu)) | |
756 | goto out; | |
757 | rc = 0; | |
758 | switch (val) { | |
759 | case 0: | |
760 | if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { | |
761 | rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); | |
c10fde0d | 762 | if (!rc) { |
08d07968 | 763 | smp_cpu_state[cpu] = CPU_STATE_STANDBY; |
c10fde0d HC |
764 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
765 | } | |
08d07968 HC |
766 | } |
767 | break; | |
768 | case 1: | |
769 | if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { | |
770 | rc = sclp_cpu_configure(__cpu_logical_map[cpu]); | |
c10fde0d | 771 | if (!rc) { |
08d07968 | 772 | smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; |
c10fde0d HC |
773 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
774 | } | |
08d07968 HC |
775 | } |
776 | break; | |
777 | default: | |
778 | break; | |
779 | } | |
780 | out: | |
08d07968 | 781 | mutex_unlock(&smp_cpu_state_mutex); |
0b18d318 | 782 | put_online_cpus(); |
08d07968 HC |
783 | return rc ? rc : count; |
784 | } | |
785 | static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); | |
786 | #endif /* CONFIG_HOTPLUG_CPU */ | |
787 | ||
4a0b2b4d AK |
788 | static ssize_t cpu_polarization_show(struct sys_device *dev, |
789 | struct sysdev_attribute *attr, char *buf) | |
c10fde0d HC |
790 | { |
791 | int cpu = dev->id; | |
792 | ssize_t count; | |
793 | ||
794 | mutex_lock(&smp_cpu_state_mutex); | |
795 | switch (smp_cpu_polarization[cpu]) { | |
796 | case POLARIZATION_HRZ: | |
797 | count = sprintf(buf, "horizontal\n"); | |
798 | break; | |
799 | case POLARIZATION_VL: | |
800 | count = sprintf(buf, "vertical:low\n"); | |
801 | break; | |
802 | case POLARIZATION_VM: | |
803 | count = sprintf(buf, "vertical:medium\n"); | |
804 | break; | |
805 | case POLARIZATION_VH: | |
806 | count = sprintf(buf, "vertical:high\n"); | |
807 | break; | |
808 | default: | |
809 | count = sprintf(buf, "unknown\n"); | |
810 | break; | |
811 | } | |
812 | mutex_unlock(&smp_cpu_state_mutex); | |
813 | return count; | |
814 | } | |
815 | static SYSDEV_ATTR(polarization, 0444, cpu_polarization_show, NULL); | |
816 | ||
4a0b2b4d AK |
817 | static ssize_t show_cpu_address(struct sys_device *dev, |
818 | struct sysdev_attribute *attr, char *buf) | |
08d07968 HC |
819 | { |
820 | return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); | |
821 | } | |
822 | static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL); | |
823 | ||
824 | ||
825 | static struct attribute *cpu_common_attrs[] = { | |
826 | #ifdef CONFIG_HOTPLUG_CPU | |
827 | &attr_configure.attr, | |
828 | #endif | |
829 | &attr_address.attr, | |
c10fde0d | 830 | &attr_polarization.attr, |
08d07968 HC |
831 | NULL, |
832 | }; | |
833 | ||
834 | static struct attribute_group cpu_common_attr_group = { | |
835 | .attrs = cpu_common_attrs, | |
836 | }; | |
1da177e4 | 837 | |
4a0b2b4d AK |
838 | static ssize_t show_capability(struct sys_device *dev, |
839 | struct sysdev_attribute *attr, char *buf) | |
2fc2d1e9 HC |
840 | { |
841 | unsigned int capability; | |
842 | int rc; | |
843 | ||
844 | rc = get_cpu_capability(&capability); | |
845 | if (rc) | |
846 | return rc; | |
847 | return sprintf(buf, "%u\n", capability); | |
848 | } | |
849 | static SYSDEV_ATTR(capability, 0444, show_capability, NULL); | |
850 | ||
4a0b2b4d AK |
851 | static ssize_t show_idle_count(struct sys_device *dev, |
852 | struct sysdev_attribute *attr, char *buf) | |
fae8b22d HC |
853 | { |
854 | struct s390_idle_data *idle; | |
855 | unsigned long long idle_count; | |
856 | ||
857 | idle = &per_cpu(s390_idle, dev->id); | |
6f430924 | 858 | spin_lock(&idle->lock); |
fae8b22d | 859 | idle_count = idle->idle_count; |
6f430924 MS |
860 | if (idle->idle_enter) |
861 | idle_count++; | |
862 | spin_unlock(&idle->lock); | |
fae8b22d HC |
863 | return sprintf(buf, "%llu\n", idle_count); |
864 | } | |
865 | static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); | |
866 | ||
4a0b2b4d AK |
867 | static ssize_t show_idle_time(struct sys_device *dev, |
868 | struct sysdev_attribute *attr, char *buf) | |
fae8b22d HC |
869 | { |
870 | struct s390_idle_data *idle; | |
6f430924 | 871 | unsigned long long now, idle_time, idle_enter; |
fae8b22d HC |
872 | |
873 | idle = &per_cpu(s390_idle, dev->id); | |
6f430924 MS |
874 | spin_lock(&idle->lock); |
875 | now = get_clock(); | |
876 | idle_time = idle->idle_time; | |
877 | idle_enter = idle->idle_enter; | |
878 | if (idle_enter != 0ULL && idle_enter < now) | |
879 | idle_time += now - idle_enter; | |
880 | spin_unlock(&idle->lock); | |
881 | return sprintf(buf, "%llu\n", idle_time >> 12); | |
fae8b22d | 882 | } |
69d39d66 | 883 | static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); |
fae8b22d | 884 | |
08d07968 | 885 | static struct attribute *cpu_online_attrs[] = { |
fae8b22d HC |
886 | &attr_capability.attr, |
887 | &attr_idle_count.attr, | |
69d39d66 | 888 | &attr_idle_time_us.attr, |
fae8b22d HC |
889 | NULL, |
890 | }; | |
891 | ||
08d07968 HC |
892 | static struct attribute_group cpu_online_attr_group = { |
893 | .attrs = cpu_online_attrs, | |
fae8b22d HC |
894 | }; |
895 | ||
2fc2d1e9 HC |
896 | static int __cpuinit smp_cpu_notify(struct notifier_block *self, |
897 | unsigned long action, void *hcpu) | |
898 | { | |
899 | unsigned int cpu = (unsigned int)(long)hcpu; | |
900 | struct cpu *c = &per_cpu(cpu_devices, cpu); | |
901 | struct sys_device *s = &c->sysdev; | |
fae8b22d | 902 | struct s390_idle_data *idle; |
2fc2d1e9 HC |
903 | |
904 | switch (action) { | |
905 | case CPU_ONLINE: | |
8bb78442 | 906 | case CPU_ONLINE_FROZEN: |
fae8b22d HC |
907 | idle = &per_cpu(s390_idle, cpu); |
908 | spin_lock_irq(&idle->lock); | |
909 | idle->idle_enter = 0; | |
910 | idle->idle_time = 0; | |
911 | idle->idle_count = 0; | |
912 | spin_unlock_irq(&idle->lock); | |
08d07968 | 913 | if (sysfs_create_group(&s->kobj, &cpu_online_attr_group)) |
2fc2d1e9 HC |
914 | return NOTIFY_BAD; |
915 | break; | |
916 | case CPU_DEAD: | |
8bb78442 | 917 | case CPU_DEAD_FROZEN: |
08d07968 | 918 | sysfs_remove_group(&s->kobj, &cpu_online_attr_group); |
2fc2d1e9 HC |
919 | break; |
920 | } | |
921 | return NOTIFY_OK; | |
922 | } | |
923 | ||
924 | static struct notifier_block __cpuinitdata smp_cpu_nb = { | |
39ce010d | 925 | .notifier_call = smp_cpu_notify, |
2fc2d1e9 HC |
926 | }; |
927 | ||
2bc89b5e | 928 | static int __devinit smp_add_present_cpu(int cpu) |
08d07968 HC |
929 | { |
930 | struct cpu *c = &per_cpu(cpu_devices, cpu); | |
931 | struct sys_device *s = &c->sysdev; | |
932 | int rc; | |
933 | ||
934 | c->hotpluggable = 1; | |
935 | rc = register_cpu(c, cpu); | |
936 | if (rc) | |
937 | goto out; | |
938 | rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group); | |
939 | if (rc) | |
940 | goto out_cpu; | |
941 | if (!cpu_online(cpu)) | |
942 | goto out; | |
943 | rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); | |
944 | if (!rc) | |
945 | return 0; | |
946 | sysfs_remove_group(&s->kobj, &cpu_common_attr_group); | |
947 | out_cpu: | |
948 | #ifdef CONFIG_HOTPLUG_CPU | |
949 | unregister_cpu(c); | |
950 | #endif | |
951 | out: | |
952 | return rc; | |
953 | } | |
954 | ||
955 | #ifdef CONFIG_HOTPLUG_CPU | |
1e489518 | 956 | |
67060d9c | 957 | int __ref smp_rescan_cpus(void) |
08d07968 HC |
958 | { |
959 | cpumask_t newcpus; | |
960 | int cpu; | |
961 | int rc; | |
962 | ||
9d40d2e3 | 963 | get_online_cpus(); |
0b18d318 | 964 | mutex_lock(&smp_cpu_state_mutex); |
08d07968 | 965 | newcpus = cpu_present_map; |
1e489518 | 966 | rc = __smp_rescan_cpus(); |
08d07968 HC |
967 | if (rc) |
968 | goto out; | |
969 | cpus_andnot(newcpus, cpu_present_map, newcpus); | |
970 | for_each_cpu_mask(cpu, newcpus) { | |
971 | rc = smp_add_present_cpu(cpu); | |
972 | if (rc) | |
973 | cpu_clear(cpu, cpu_present_map); | |
974 | } | |
975 | rc = 0; | |
976 | out: | |
08d07968 | 977 | mutex_unlock(&smp_cpu_state_mutex); |
0b18d318 | 978 | put_online_cpus(); |
c10fde0d HC |
979 | if (!cpus_empty(newcpus)) |
980 | topology_schedule_update(); | |
1e489518 HC |
981 | return rc; |
982 | } | |
983 | ||
da5aae70 | 984 | static ssize_t __ref rescan_store(struct sysdev_class *class, const char *buf, |
1e489518 HC |
985 | size_t count) |
986 | { | |
987 | int rc; | |
988 | ||
989 | rc = smp_rescan_cpus(); | |
08d07968 HC |
990 | return rc ? rc : count; |
991 | } | |
da5aae70 | 992 | static SYSDEV_CLASS_ATTR(rescan, 0200, NULL, rescan_store); |
08d07968 HC |
993 | #endif /* CONFIG_HOTPLUG_CPU */ |
994 | ||
da5aae70 | 995 | static ssize_t dispatching_show(struct sysdev_class *class, char *buf) |
c10fde0d HC |
996 | { |
997 | ssize_t count; | |
998 | ||
999 | mutex_lock(&smp_cpu_state_mutex); | |
1000 | count = sprintf(buf, "%d\n", cpu_management); | |
1001 | mutex_unlock(&smp_cpu_state_mutex); | |
1002 | return count; | |
1003 | } | |
1004 | ||
da5aae70 HC |
1005 | static ssize_t dispatching_store(struct sysdev_class *dev, const char *buf, |
1006 | size_t count) | |
c10fde0d HC |
1007 | { |
1008 | int val, rc; | |
1009 | char delim; | |
1010 | ||
1011 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
1012 | return -EINVAL; | |
1013 | if (val != 0 && val != 1) | |
1014 | return -EINVAL; | |
1015 | rc = 0; | |
c10fde0d | 1016 | get_online_cpus(); |
0b18d318 | 1017 | mutex_lock(&smp_cpu_state_mutex); |
c10fde0d HC |
1018 | if (cpu_management == val) |
1019 | goto out; | |
1020 | rc = topology_set_cpu_management(val); | |
1021 | if (!rc) | |
1022 | cpu_management = val; | |
1023 | out: | |
c10fde0d | 1024 | mutex_unlock(&smp_cpu_state_mutex); |
0b18d318 | 1025 | put_online_cpus(); |
c10fde0d HC |
1026 | return rc ? rc : count; |
1027 | } | |
da5aae70 HC |
1028 | static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show, |
1029 | dispatching_store); | |
c10fde0d | 1030 | |
1da177e4 LT |
1031 | static int __init topology_init(void) |
1032 | { | |
1033 | int cpu; | |
fae8b22d | 1034 | int rc; |
2fc2d1e9 HC |
1035 | |
1036 | register_cpu_notifier(&smp_cpu_nb); | |
1da177e4 | 1037 | |
08d07968 | 1038 | #ifdef CONFIG_HOTPLUG_CPU |
da5aae70 | 1039 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_rescan); |
08d07968 HC |
1040 | if (rc) |
1041 | return rc; | |
1042 | #endif | |
da5aae70 | 1043 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_dispatching); |
c10fde0d HC |
1044 | if (rc) |
1045 | return rc; | |
08d07968 HC |
1046 | for_each_present_cpu(cpu) { |
1047 | rc = smp_add_present_cpu(cpu); | |
fae8b22d HC |
1048 | if (rc) |
1049 | return rc; | |
1da177e4 LT |
1050 | } |
1051 | return 0; | |
1052 | } | |
1da177e4 | 1053 | subsys_initcall(topology_init); |