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Commit | Line | Data |
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08e875c1 CM |
1 | /* |
2 | * SMP initialisation and IPI support | |
3 | * Based on arch/arm/kernel/smp.c | |
4 | * | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/delay.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/cache.h> | |
26 | #include <linux/profile.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/cpu.h> | |
31 | #include <linux/smp.h> | |
32 | #include <linux/seq_file.h> | |
33 | #include <linux/irq.h> | |
34 | #include <linux/percpu.h> | |
35 | #include <linux/clockchips.h> | |
36 | #include <linux/completion.h> | |
37 | #include <linux/of.h> | |
eb631bb5 | 38 | #include <linux/irq_work.h> |
08e875c1 | 39 | |
e039ee4e | 40 | #include <asm/alternative.h> |
08e875c1 CM |
41 | #include <asm/atomic.h> |
42 | #include <asm/cacheflush.h> | |
df857416 | 43 | #include <asm/cpu.h> |
08e875c1 | 44 | #include <asm/cputype.h> |
cd1aebf5 | 45 | #include <asm/cpu_ops.h> |
08e875c1 CM |
46 | #include <asm/mmu_context.h> |
47 | #include <asm/pgtable.h> | |
48 | #include <asm/pgalloc.h> | |
49 | #include <asm/processor.h> | |
4c7aa002 | 50 | #include <asm/smp_plat.h> |
08e875c1 CM |
51 | #include <asm/sections.h> |
52 | #include <asm/tlbflush.h> | |
53 | #include <asm/ptrace.h> | |
08e875c1 | 54 | |
45ed695a NP |
55 | #define CREATE_TRACE_POINTS |
56 | #include <trace/events/ipi.h> | |
57 | ||
08e875c1 CM |
58 | /* |
59 | * as from 2.5, kernels no longer have an init_tasks structure | |
60 | * so we need some other way of telling a new secondary core | |
61 | * where to place its SVC stack | |
62 | */ | |
63 | struct secondary_data secondary_data; | |
08e875c1 CM |
64 | |
65 | enum ipi_msg_type { | |
66 | IPI_RESCHEDULE, | |
67 | IPI_CALL_FUNC, | |
08e875c1 | 68 | IPI_CPU_STOP, |
1f85008e | 69 | IPI_TIMER, |
eb631bb5 | 70 | IPI_IRQ_WORK, |
08e875c1 CM |
71 | }; |
72 | ||
08e875c1 CM |
73 | /* |
74 | * Boot a secondary CPU, and assign it the specified idle task. | |
75 | * This also gives us the initial stack to use for this CPU. | |
76 | */ | |
b8c6453a | 77 | static int boot_secondary(unsigned int cpu, struct task_struct *idle) |
08e875c1 | 78 | { |
652af899 MR |
79 | if (cpu_ops[cpu]->cpu_boot) |
80 | return cpu_ops[cpu]->cpu_boot(cpu); | |
08e875c1 | 81 | |
652af899 | 82 | return -EOPNOTSUPP; |
08e875c1 CM |
83 | } |
84 | ||
85 | static DECLARE_COMPLETION(cpu_running); | |
86 | ||
b8c6453a | 87 | int __cpu_up(unsigned int cpu, struct task_struct *idle) |
08e875c1 CM |
88 | { |
89 | int ret; | |
90 | ||
91 | /* | |
92 | * We need to tell the secondary core where to find its stack and the | |
93 | * page tables. | |
94 | */ | |
95 | secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; | |
96 | __flush_dcache_area(&secondary_data, sizeof(secondary_data)); | |
97 | ||
98 | /* | |
99 | * Now bring the CPU into our world. | |
100 | */ | |
101 | ret = boot_secondary(cpu, idle); | |
102 | if (ret == 0) { | |
103 | /* | |
104 | * CPU was successfully started, wait for it to come online or | |
105 | * time out. | |
106 | */ | |
107 | wait_for_completion_timeout(&cpu_running, | |
108 | msecs_to_jiffies(1000)); | |
109 | ||
110 | if (!cpu_online(cpu)) { | |
111 | pr_crit("CPU%u: failed to come online\n", cpu); | |
112 | ret = -EIO; | |
113 | } | |
114 | } else { | |
115 | pr_err("CPU%u: failed to boot: %d\n", cpu, ret); | |
116 | } | |
117 | ||
118 | secondary_data.stack = NULL; | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
f6e763b9 MB |
123 | static void smp_store_cpu_info(unsigned int cpuid) |
124 | { | |
125 | store_cpu_topology(cpuid); | |
126 | } | |
127 | ||
08e875c1 CM |
128 | /* |
129 | * This is the secondary CPU boot entry. We're using this CPUs | |
130 | * idle thread stack, but a set of temporary page tables. | |
131 | */ | |
b8c6453a | 132 | asmlinkage void secondary_start_kernel(void) |
08e875c1 CM |
133 | { |
134 | struct mm_struct *mm = &init_mm; | |
135 | unsigned int cpu = smp_processor_id(); | |
136 | ||
08e875c1 CM |
137 | /* |
138 | * All kernel threads share the same mm context; grab a | |
139 | * reference and switch to it. | |
140 | */ | |
141 | atomic_inc(&mm->mm_count); | |
142 | current->active_mm = mm; | |
143 | cpumask_set_cpu(cpu, mm_cpumask(mm)); | |
144 | ||
71586276 WD |
145 | set_my_cpu_offset(per_cpu_offset(smp_processor_id())); |
146 | printk("CPU%u: Booted secondary processor\n", cpu); | |
147 | ||
08e875c1 CM |
148 | /* |
149 | * TTBR0 is only used for the identity mapping at this stage. Make it | |
150 | * point to zero page to avoid speculatively fetching new entries. | |
151 | */ | |
152 | cpu_set_reserved_ttbr0(); | |
153 | flush_tlb_all(); | |
154 | ||
155 | preempt_disable(); | |
156 | trace_hardirqs_off(); | |
157 | ||
652af899 MR |
158 | if (cpu_ops[cpu]->cpu_postboot) |
159 | cpu_ops[cpu]->cpu_postboot(); | |
08e875c1 | 160 | |
df857416 MR |
161 | /* |
162 | * Log the CPU info before it is marked online and might get read. | |
163 | */ | |
164 | cpuinfo_store_cpu(); | |
165 | ||
7ade67b5 MZ |
166 | /* |
167 | * Enable GIC and timers. | |
168 | */ | |
169 | notify_cpu_starting(cpu); | |
170 | ||
f6e763b9 MB |
171 | smp_store_cpu_info(cpu); |
172 | ||
08e875c1 CM |
173 | /* |
174 | * OK, now it's safe to let the boot CPU continue. Wait for | |
175 | * the CPU migration code to notice that the CPU is online | |
176 | * before we continue. | |
177 | */ | |
178 | set_cpu_online(cpu, true); | |
b3770b32 | 179 | complete(&cpu_running); |
08e875c1 | 180 | |
d8ed442a | 181 | local_dbg_enable(); |
53ae3acd | 182 | local_irq_enable(); |
b3bf6aa7 | 183 | local_async_enable(); |
53ae3acd | 184 | |
08e875c1 CM |
185 | /* |
186 | * OK, it's off to the idle thread for us | |
187 | */ | |
0087298f | 188 | cpu_startup_entry(CPUHP_ONLINE); |
08e875c1 CM |
189 | } |
190 | ||
9327e2c6 MR |
191 | #ifdef CONFIG_HOTPLUG_CPU |
192 | static int op_cpu_disable(unsigned int cpu) | |
193 | { | |
194 | /* | |
195 | * If we don't have a cpu_die method, abort before we reach the point | |
196 | * of no return. CPU0 may not have an cpu_ops, so test for it. | |
197 | */ | |
198 | if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_die) | |
199 | return -EOPNOTSUPP; | |
200 | ||
201 | /* | |
202 | * We may need to abort a hot unplug for some other mechanism-specific | |
203 | * reason. | |
204 | */ | |
205 | if (cpu_ops[cpu]->cpu_disable) | |
206 | return cpu_ops[cpu]->cpu_disable(cpu); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | /* | |
212 | * __cpu_disable runs on the processor to be shutdown. | |
213 | */ | |
214 | int __cpu_disable(void) | |
215 | { | |
216 | unsigned int cpu = smp_processor_id(); | |
217 | int ret; | |
218 | ||
219 | ret = op_cpu_disable(cpu); | |
220 | if (ret) | |
221 | return ret; | |
222 | ||
223 | /* | |
224 | * Take this CPU offline. Once we clear this, we can't return, | |
225 | * and we must not schedule until we're ready to give up the cpu. | |
226 | */ | |
227 | set_cpu_online(cpu, false); | |
228 | ||
229 | /* | |
230 | * OK - migrate IRQs away from this CPU | |
231 | */ | |
232 | migrate_irqs(); | |
233 | ||
234 | /* | |
235 | * Remove this CPU from the vm mask set of all processes. | |
236 | */ | |
237 | clear_tasks_mm_cpumask(cpu); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
c814ca02 AC |
242 | static int op_cpu_kill(unsigned int cpu) |
243 | { | |
244 | /* | |
245 | * If we have no means of synchronising with the dying CPU, then assume | |
246 | * that it is really dead. We can only wait for an arbitrary length of | |
247 | * time and hope that it's dead, so let's skip the wait and just hope. | |
248 | */ | |
249 | if (!cpu_ops[cpu]->cpu_kill) | |
250 | return 1; | |
251 | ||
252 | return cpu_ops[cpu]->cpu_kill(cpu); | |
253 | } | |
254 | ||
9327e2c6 MR |
255 | static DECLARE_COMPLETION(cpu_died); |
256 | ||
257 | /* | |
258 | * called on the thread which is asking for a CPU to be shutdown - | |
259 | * waits until shutdown has completed, or it is timed out. | |
260 | */ | |
261 | void __cpu_die(unsigned int cpu) | |
262 | { | |
263 | if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) { | |
264 | pr_crit("CPU%u: cpu didn't die\n", cpu); | |
265 | return; | |
266 | } | |
267 | pr_notice("CPU%u: shutdown\n", cpu); | |
c814ca02 AC |
268 | |
269 | /* | |
270 | * Now that the dying CPU is beyond the point of no return w.r.t. | |
271 | * in-kernel synchronisation, try to get the firwmare to help us to | |
272 | * verify that it has really left the kernel before we consider | |
273 | * clobbering anything it might still be using. | |
274 | */ | |
275 | if (!op_cpu_kill(cpu)) | |
276 | pr_warn("CPU%d may not have shut down cleanly\n", cpu); | |
9327e2c6 MR |
277 | } |
278 | ||
279 | /* | |
280 | * Called from the idle thread for the CPU which has been shutdown. | |
281 | * | |
282 | * Note that we disable IRQs here, but do not re-enable them | |
283 | * before returning to the caller. This is also the behaviour | |
284 | * of the other hotplug-cpu capable cores, so presumably coming | |
285 | * out of idle fixes this. | |
286 | */ | |
287 | void cpu_die(void) | |
288 | { | |
289 | unsigned int cpu = smp_processor_id(); | |
290 | ||
291 | idle_task_exit(); | |
292 | ||
293 | local_irq_disable(); | |
294 | ||
295 | /* Tell __cpu_die() that this CPU is now safe to dispose of */ | |
296 | complete(&cpu_died); | |
297 | ||
298 | /* | |
299 | * Actually shutdown the CPU. This must never fail. The specific hotplug | |
300 | * mechanism must perform all required cache maintenance to ensure that | |
301 | * no dirty lines are lost in the process of shutting down the CPU. | |
302 | */ | |
303 | cpu_ops[cpu]->cpu_die(cpu); | |
304 | ||
305 | BUG(); | |
306 | } | |
307 | #endif | |
308 | ||
08e875c1 CM |
309 | void __init smp_cpus_done(unsigned int max_cpus) |
310 | { | |
326b16db | 311 | pr_info("SMP: Total of %d processors activated.\n", num_online_cpus()); |
932ded4b | 312 | apply_alternatives_all(); |
08e875c1 CM |
313 | } |
314 | ||
315 | void __init smp_prepare_boot_cpu(void) | |
316 | { | |
71586276 | 317 | set_my_cpu_offset(per_cpu_offset(smp_processor_id())); |
08e875c1 CM |
318 | } |
319 | ||
08e875c1 | 320 | /* |
4c7aa002 JM |
321 | * Enumerate the possible CPU set from the device tree and build the |
322 | * cpu logical map array containing MPIDR values related to logical | |
323 | * cpus. Assumes that cpu_logical_map(0) has already been initialized. | |
08e875c1 CM |
324 | */ |
325 | void __init smp_init_cpus(void) | |
326 | { | |
08e875c1 | 327 | struct device_node *dn = NULL; |
cd1aebf5 | 328 | unsigned int i, cpu = 1; |
4c7aa002 | 329 | bool bootcpu_valid = false; |
08e875c1 CM |
330 | |
331 | while ((dn = of_find_node_by_type(dn, "cpu"))) { | |
72aea393 | 332 | const u32 *cell; |
4c7aa002 JM |
333 | u64 hwid; |
334 | ||
335 | /* | |
336 | * A cpu node with missing "reg" property is | |
337 | * considered invalid to build a cpu_logical_map | |
338 | * entry. | |
339 | */ | |
72aea393 WD |
340 | cell = of_get_property(dn, "reg", NULL); |
341 | if (!cell) { | |
4c7aa002 JM |
342 | pr_err("%s: missing reg property\n", dn->full_name); |
343 | goto next; | |
344 | } | |
72aea393 | 345 | hwid = of_read_number(cell, of_n_addr_cells(dn)); |
4c7aa002 JM |
346 | |
347 | /* | |
348 | * Non affinity bits must be set to 0 in the DT | |
349 | */ | |
350 | if (hwid & ~MPIDR_HWID_BITMASK) { | |
351 | pr_err("%s: invalid reg property\n", dn->full_name); | |
352 | goto next; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Duplicate MPIDRs are a recipe for disaster. Scan | |
357 | * all initialized entries and check for | |
358 | * duplicates. If any is found just ignore the cpu. | |
359 | * cpu_logical_map was initialized to INVALID_HWID to | |
360 | * avoid matching valid MPIDR values. | |
361 | */ | |
362 | for (i = 1; (i < cpu) && (i < NR_CPUS); i++) { | |
363 | if (cpu_logical_map(i) == hwid) { | |
364 | pr_err("%s: duplicate cpu reg properties in the DT\n", | |
365 | dn->full_name); | |
366 | goto next; | |
367 | } | |
368 | } | |
369 | ||
370 | /* | |
371 | * The numbering scheme requires that the boot CPU | |
372 | * must be assigned logical id 0. Record it so that | |
373 | * the logical map built from DT is validated and can | |
374 | * be used. | |
375 | */ | |
376 | if (hwid == cpu_logical_map(0)) { | |
377 | if (bootcpu_valid) { | |
378 | pr_err("%s: duplicate boot cpu reg property in DT\n", | |
379 | dn->full_name); | |
380 | goto next; | |
381 | } | |
382 | ||
383 | bootcpu_valid = true; | |
384 | ||
385 | /* | |
386 | * cpu_logical_map has already been | |
387 | * initialized and the boot cpu doesn't need | |
388 | * the enable-method so continue without | |
389 | * incrementing cpu. | |
390 | */ | |
391 | continue; | |
392 | } | |
393 | ||
08e875c1 CM |
394 | if (cpu >= NR_CPUS) |
395 | goto next; | |
396 | ||
e8765b26 | 397 | if (cpu_read_ops(dn, cpu) != 0) |
08e875c1 | 398 | goto next; |
08e875c1 | 399 | |
cd1aebf5 | 400 | if (cpu_ops[cpu]->cpu_init(dn, cpu)) |
d329de3f MZ |
401 | goto next; |
402 | ||
4c7aa002 JM |
403 | pr_debug("cpu logical map 0x%llx\n", hwid); |
404 | cpu_logical_map(cpu) = hwid; | |
08e875c1 CM |
405 | next: |
406 | cpu++; | |
407 | } | |
408 | ||
409 | /* sanity check */ | |
410 | if (cpu > NR_CPUS) | |
411 | pr_warning("no. of cores (%d) greater than configured maximum of %d - clipping\n", | |
412 | cpu, NR_CPUS); | |
4c7aa002 JM |
413 | |
414 | if (!bootcpu_valid) { | |
415 | pr_err("DT missing boot CPU MPIDR, not enabling secondaries\n"); | |
416 | return; | |
417 | } | |
418 | ||
419 | /* | |
420 | * All the cpus that made it to the cpu_logical_map have been | |
421 | * validated so set them as possible cpus. | |
422 | */ | |
423 | for (i = 0; i < NR_CPUS; i++) | |
424 | if (cpu_logical_map(i) != INVALID_HWID) | |
425 | set_cpu_possible(i, true); | |
08e875c1 CM |
426 | } |
427 | ||
428 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
429 | { | |
cd1aebf5 MR |
430 | int err; |
431 | unsigned int cpu, ncores = num_possible_cpus(); | |
08e875c1 | 432 | |
f6e763b9 MB |
433 | init_cpu_topology(); |
434 | ||
435 | smp_store_cpu_info(smp_processor_id()); | |
436 | ||
08e875c1 CM |
437 | /* |
438 | * are we trying to boot more cores than exist? | |
439 | */ | |
440 | if (max_cpus > ncores) | |
441 | max_cpus = ncores; | |
442 | ||
d329de3f MZ |
443 | /* Don't bother if we're effectively UP */ |
444 | if (max_cpus <= 1) | |
445 | return; | |
446 | ||
08e875c1 CM |
447 | /* |
448 | * Initialise the present map (which describes the set of CPUs | |
449 | * actually populated at the present time) and release the | |
450 | * secondaries from the bootloader. | |
d329de3f MZ |
451 | * |
452 | * Make sure we online at most (max_cpus - 1) additional CPUs. | |
08e875c1 | 453 | */ |
d329de3f | 454 | max_cpus--; |
08e875c1 CM |
455 | for_each_possible_cpu(cpu) { |
456 | if (max_cpus == 0) | |
457 | break; | |
458 | ||
d329de3f MZ |
459 | if (cpu == smp_processor_id()) |
460 | continue; | |
461 | ||
cd1aebf5 | 462 | if (!cpu_ops[cpu]) |
08e875c1 CM |
463 | continue; |
464 | ||
cd1aebf5 | 465 | err = cpu_ops[cpu]->cpu_prepare(cpu); |
d329de3f MZ |
466 | if (err) |
467 | continue; | |
08e875c1 CM |
468 | |
469 | set_cpu_present(cpu, true); | |
470 | max_cpus--; | |
471 | } | |
08e875c1 CM |
472 | } |
473 | ||
36310736 | 474 | void (*__smp_cross_call)(const struct cpumask *, unsigned int); |
08e875c1 CM |
475 | |
476 | void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int)) | |
477 | { | |
45ed695a | 478 | __smp_cross_call = fn; |
08e875c1 CM |
479 | } |
480 | ||
45ed695a NP |
481 | static const char *ipi_types[NR_IPI] __tracepoint_string = { |
482 | #define S(x,s) [x] = s | |
08e875c1 CM |
483 | S(IPI_RESCHEDULE, "Rescheduling interrupts"), |
484 | S(IPI_CALL_FUNC, "Function call interrupts"), | |
08e875c1 | 485 | S(IPI_CPU_STOP, "CPU stop interrupts"), |
1f85008e | 486 | S(IPI_TIMER, "Timer broadcast interrupts"), |
eb631bb5 | 487 | S(IPI_IRQ_WORK, "IRQ work interrupts"), |
08e875c1 CM |
488 | }; |
489 | ||
45ed695a NP |
490 | static void smp_cross_call(const struct cpumask *target, unsigned int ipinr) |
491 | { | |
492 | trace_ipi_raise(target, ipi_types[ipinr]); | |
493 | __smp_cross_call(target, ipinr); | |
494 | } | |
495 | ||
08e875c1 CM |
496 | void show_ipi_list(struct seq_file *p, int prec) |
497 | { | |
498 | unsigned int cpu, i; | |
499 | ||
500 | for (i = 0; i < NR_IPI; i++) { | |
45ed695a | 501 | seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i, |
08e875c1 | 502 | prec >= 4 ? " " : ""); |
67317c26 | 503 | for_each_online_cpu(cpu) |
08e875c1 CM |
504 | seq_printf(p, "%10u ", |
505 | __get_irq_stat(cpu, ipi_irqs[i])); | |
506 | seq_printf(p, " %s\n", ipi_types[i]); | |
507 | } | |
508 | } | |
509 | ||
510 | u64 smp_irq_stat_cpu(unsigned int cpu) | |
511 | { | |
512 | u64 sum = 0; | |
513 | int i; | |
514 | ||
515 | for (i = 0; i < NR_IPI; i++) | |
516 | sum += __get_irq_stat(cpu, ipi_irqs[i]); | |
517 | ||
518 | return sum; | |
519 | } | |
520 | ||
45ed695a NP |
521 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
522 | { | |
523 | smp_cross_call(mask, IPI_CALL_FUNC); | |
524 | } | |
525 | ||
526 | void arch_send_call_function_single_ipi(int cpu) | |
527 | { | |
0aaf0dae | 528 | smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC); |
45ed695a NP |
529 | } |
530 | ||
531 | #ifdef CONFIG_IRQ_WORK | |
532 | void arch_irq_work_raise(void) | |
533 | { | |
534 | if (__smp_cross_call) | |
535 | smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK); | |
536 | } | |
537 | #endif | |
538 | ||
08e875c1 CM |
539 | static DEFINE_RAW_SPINLOCK(stop_lock); |
540 | ||
541 | /* | |
542 | * ipi_cpu_stop - handle IPI from smp_send_stop() | |
543 | */ | |
544 | static void ipi_cpu_stop(unsigned int cpu) | |
545 | { | |
546 | if (system_state == SYSTEM_BOOTING || | |
547 | system_state == SYSTEM_RUNNING) { | |
548 | raw_spin_lock(&stop_lock); | |
549 | pr_crit("CPU%u: stopping\n", cpu); | |
550 | dump_stack(); | |
551 | raw_spin_unlock(&stop_lock); | |
552 | } | |
553 | ||
554 | set_cpu_online(cpu, false); | |
555 | ||
08e875c1 CM |
556 | local_irq_disable(); |
557 | ||
558 | while (1) | |
559 | cpu_relax(); | |
560 | } | |
561 | ||
562 | /* | |
563 | * Main handler for inter-processor interrupts | |
564 | */ | |
565 | void handle_IPI(int ipinr, struct pt_regs *regs) | |
566 | { | |
567 | unsigned int cpu = smp_processor_id(); | |
568 | struct pt_regs *old_regs = set_irq_regs(regs); | |
569 | ||
45ed695a NP |
570 | if ((unsigned)ipinr < NR_IPI) { |
571 | trace_ipi_entry(ipi_types[ipinr]); | |
572 | __inc_irq_stat(cpu, ipi_irqs[ipinr]); | |
573 | } | |
08e875c1 CM |
574 | |
575 | switch (ipinr) { | |
576 | case IPI_RESCHEDULE: | |
577 | scheduler_ipi(); | |
578 | break; | |
579 | ||
580 | case IPI_CALL_FUNC: | |
581 | irq_enter(); | |
582 | generic_smp_call_function_interrupt(); | |
583 | irq_exit(); | |
584 | break; | |
585 | ||
08e875c1 CM |
586 | case IPI_CPU_STOP: |
587 | irq_enter(); | |
588 | ipi_cpu_stop(cpu); | |
589 | irq_exit(); | |
590 | break; | |
591 | ||
1f85008e LP |
592 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
593 | case IPI_TIMER: | |
594 | irq_enter(); | |
595 | tick_receive_broadcast(); | |
596 | irq_exit(); | |
597 | break; | |
598 | #endif | |
599 | ||
eb631bb5 LB |
600 | #ifdef CONFIG_IRQ_WORK |
601 | case IPI_IRQ_WORK: | |
602 | irq_enter(); | |
603 | irq_work_run(); | |
604 | irq_exit(); | |
605 | break; | |
606 | #endif | |
607 | ||
08e875c1 CM |
608 | default: |
609 | pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr); | |
610 | break; | |
611 | } | |
45ed695a NP |
612 | |
613 | if ((unsigned)ipinr < NR_IPI) | |
614 | trace_ipi_exit(ipi_types[ipinr]); | |
08e875c1 CM |
615 | set_irq_regs(old_regs); |
616 | } | |
617 | ||
618 | void smp_send_reschedule(int cpu) | |
619 | { | |
620 | smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); | |
621 | } | |
622 | ||
1f85008e LP |
623 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
624 | void tick_broadcast(const struct cpumask *mask) | |
625 | { | |
626 | smp_cross_call(mask, IPI_TIMER); | |
627 | } | |
628 | #endif | |
629 | ||
08e875c1 CM |
630 | void smp_send_stop(void) |
631 | { | |
632 | unsigned long timeout; | |
633 | ||
634 | if (num_online_cpus() > 1) { | |
635 | cpumask_t mask; | |
636 | ||
637 | cpumask_copy(&mask, cpu_online_mask); | |
638 | cpu_clear(smp_processor_id(), mask); | |
639 | ||
640 | smp_cross_call(&mask, IPI_CPU_STOP); | |
641 | } | |
642 | ||
643 | /* Wait up to one second for other CPUs to stop */ | |
644 | timeout = USEC_PER_SEC; | |
645 | while (num_online_cpus() > 1 && timeout--) | |
646 | udelay(1); | |
647 | ||
648 | if (num_online_cpus() > 1) | |
649 | pr_warning("SMP: failed to stop secondary CPUs\n"); | |
650 | } | |
651 | ||
652 | /* | |
653 | * not supported here | |
654 | */ | |
655 | int setup_profiling_timer(unsigned int multiplier) | |
656 | { | |
657 | return -EINVAL; | |
658 | } |