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42682c6c JH |
1 | /* |
2 | * Copyright (C) 2009,2010,2011 Imagination Technologies Ltd. | |
3 | * | |
4 | * Copyright (C) 2002 ARM Limited, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/atomic.h> | |
96498144 | 11 | #include <linux/completion.h> |
42682c6c JH |
12 | #include <linux/delay.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/spinlock.h> | |
68e21be2 | 15 | #include <linux/sched/mm.h> |
ef8bd77f | 16 | #include <linux/sched/hotplug.h> |
68db0cf1 | 17 | #include <linux/sched/task_stack.h> |
42682c6c JH |
18 | #include <linux/interrupt.h> |
19 | #include <linux/cache.h> | |
20 | #include <linux/profile.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/cpu.h> | |
25 | #include <linux/smp.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/irq.h> | |
28 | #include <linux/bootmem.h> | |
29 | ||
30 | #include <asm/cacheflush.h> | |
31 | #include <asm/cachepart.h> | |
32 | #include <asm/core_reg.h> | |
33 | #include <asm/cpu.h> | |
9e712963 JH |
34 | #include <asm/global_lock.h> |
35 | #include <asm/metag_mem.h> | |
42682c6c JH |
36 | #include <asm/mmu_context.h> |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/pgalloc.h> | |
39 | #include <asm/processor.h> | |
40 | #include <asm/setup.h> | |
41 | #include <asm/tlbflush.h> | |
42 | #include <asm/hwthread.h> | |
43 | #include <asm/traps.h> | |
44 | ||
9e712963 JH |
45 | #define SYSC_DCPART(n) (SYSC_DCPART0 + SYSC_xCPARTn_STRIDE * (n)) |
46 | #define SYSC_ICPART(n) (SYSC_ICPART0 + SYSC_xCPARTn_STRIDE * (n)) | |
47 | ||
42682c6c JH |
48 | DECLARE_PER_CPU(PTBI, pTBI); |
49 | ||
50 | void *secondary_data_stack; | |
51 | ||
52 | /* | |
53 | * structures for inter-processor calls | |
54 | * - A collection of single bit ipi messages. | |
55 | */ | |
56 | struct ipi_data { | |
57 | spinlock_t lock; | |
58 | unsigned long ipi_count; | |
59 | unsigned long bits; | |
60 | }; | |
61 | ||
62 | static DEFINE_PER_CPU(struct ipi_data, ipi_data) = { | |
63 | .lock = __SPIN_LOCK_UNLOCKED(ipi_data.lock), | |
64 | }; | |
65 | ||
66 | static DEFINE_SPINLOCK(boot_lock); | |
67 | ||
96498144 JH |
68 | static DECLARE_COMPLETION(cpu_running); |
69 | ||
42682c6c JH |
70 | /* |
71 | * "thread" is assumed to be a valid Meta hardware thread ID. | |
72 | */ | |
e9a1d016 | 73 | static int boot_secondary(unsigned int thread, struct task_struct *idle) |
42682c6c JH |
74 | { |
75 | u32 val; | |
76 | ||
77 | /* | |
78 | * set synchronisation state between this boot processor | |
79 | * and the secondary one | |
80 | */ | |
81 | spin_lock(&boot_lock); | |
82 | ||
83 | core_reg_write(TXUPC_ID, 0, thread, (unsigned int)secondary_startup); | |
84 | core_reg_write(TXUPC_ID, 1, thread, 0); | |
85 | ||
86 | /* | |
87 | * Give the thread privilege (PSTAT) and clear potentially problematic | |
88 | * bits in the process (namely ISTAT, CBMarker, CBMarkerI, LSM_STEP). | |
89 | */ | |
90 | core_reg_write(TXUCT_ID, TXSTATUS_REGNUM, thread, TXSTATUS_PSTAT_BIT); | |
91 | ||
92 | /* Clear the minim enable bit. */ | |
93 | val = core_reg_read(TXUCT_ID, TXPRIVEXT_REGNUM, thread); | |
94 | core_reg_write(TXUCT_ID, TXPRIVEXT_REGNUM, thread, val & ~0x80); | |
95 | ||
96 | /* | |
97 | * set the ThreadEnable bit (0x1) in the TXENABLE register | |
98 | * for the specified thread - off it goes! | |
99 | */ | |
100 | val = core_reg_read(TXUCT_ID, TXENABLE_REGNUM, thread); | |
101 | core_reg_write(TXUCT_ID, TXENABLE_REGNUM, thread, val | 0x1); | |
102 | ||
103 | /* | |
104 | * now the secondary core is starting up let it run its | |
105 | * calibrations, then wait for it to finish | |
106 | */ | |
107 | spin_unlock(&boot_lock); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
9e712963 JH |
112 | /** |
113 | * describe_cachepart_change: describe a change to cache partitions. | |
114 | * @thread: Hardware thread number. | |
115 | * @label: Label of cache type, e.g. "dcache" or "icache". | |
116 | * @sz: Total size of the cache. | |
117 | * @old: Old cache partition configuration (*CPART* register). | |
118 | * @new: New cache partition configuration (*CPART* register). | |
119 | * | |
120 | * If the cache partition has changed, prints a message to the log describing | |
121 | * those changes. | |
122 | */ | |
54be16e7 PG |
123 | static void describe_cachepart_change(unsigned int thread, const char *label, |
124 | unsigned int sz, unsigned int old, | |
125 | unsigned int new) | |
9e712963 JH |
126 | { |
127 | unsigned int lor1, land1, gor1, gand1; | |
128 | unsigned int lor2, land2, gor2, gand2; | |
129 | unsigned int diff = old ^ new; | |
130 | ||
131 | if (!diff) | |
132 | return; | |
133 | ||
134 | pr_info("Thread %d: %s partition changed:", thread, label); | |
135 | if (diff & (SYSC_xCPARTL_OR_BITS | SYSC_xCPARTL_AND_BITS)) { | |
136 | lor1 = (old & SYSC_xCPARTL_OR_BITS) >> SYSC_xCPARTL_OR_S; | |
137 | lor2 = (new & SYSC_xCPARTL_OR_BITS) >> SYSC_xCPARTL_OR_S; | |
138 | land1 = (old & SYSC_xCPARTL_AND_BITS) >> SYSC_xCPARTL_AND_S; | |
139 | land2 = (new & SYSC_xCPARTL_AND_BITS) >> SYSC_xCPARTL_AND_S; | |
140 | pr_cont(" L:%#x+%#x->%#x+%#x", | |
141 | (lor1 * sz) >> 4, | |
142 | ((land1 + 1) * sz) >> 4, | |
143 | (lor2 * sz) >> 4, | |
144 | ((land2 + 1) * sz) >> 4); | |
145 | } | |
146 | if (diff & (SYSC_xCPARTG_OR_BITS | SYSC_xCPARTG_AND_BITS)) { | |
147 | gor1 = (old & SYSC_xCPARTG_OR_BITS) >> SYSC_xCPARTG_OR_S; | |
148 | gor2 = (new & SYSC_xCPARTG_OR_BITS) >> SYSC_xCPARTG_OR_S; | |
149 | gand1 = (old & SYSC_xCPARTG_AND_BITS) >> SYSC_xCPARTG_AND_S; | |
150 | gand2 = (new & SYSC_xCPARTG_AND_BITS) >> SYSC_xCPARTG_AND_S; | |
151 | pr_cont(" G:%#x+%#x->%#x+%#x", | |
152 | (gor1 * sz) >> 4, | |
153 | ((gand1 + 1) * sz) >> 4, | |
154 | (gor2 * sz) >> 4, | |
155 | ((gand2 + 1) * sz) >> 4); | |
156 | } | |
157 | if (diff & SYSC_CWRMODE_BIT) | |
158 | pr_cont(" %sWR", | |
159 | (new & SYSC_CWRMODE_BIT) ? "+" : "-"); | |
160 | if (diff & SYSC_DCPART_GCON_BIT) | |
161 | pr_cont(" %sGCOn", | |
162 | (new & SYSC_DCPART_GCON_BIT) ? "+" : "-"); | |
163 | pr_cont("\n"); | |
164 | } | |
165 | ||
166 | /** | |
167 | * setup_smp_cache: ensure cache coherency for new SMP thread. | |
168 | * @thread: New hardware thread number. | |
169 | * | |
170 | * Ensures that coherency is enabled and that the threads share the same cache | |
171 | * partitions. | |
172 | */ | |
54be16e7 | 173 | static void setup_smp_cache(unsigned int thread) |
9e712963 JH |
174 | { |
175 | unsigned int this_thread, lflags; | |
176 | unsigned int dcsz, dcpart_this, dcpart_old, dcpart_new; | |
177 | unsigned int icsz, icpart_old, icpart_new; | |
178 | ||
179 | /* | |
180 | * Copy over the current thread's cache partition configuration to the | |
181 | * new thread so that they share cache partitions. | |
182 | */ | |
183 | __global_lock2(lflags); | |
184 | this_thread = hard_processor_id(); | |
185 | /* Share dcache partition */ | |
186 | dcpart_this = metag_in32(SYSC_DCPART(this_thread)); | |
187 | dcpart_old = metag_in32(SYSC_DCPART(thread)); | |
188 | dcpart_new = dcpart_this; | |
189 | #if PAGE_OFFSET < LINGLOBAL_BASE | |
190 | /* | |
191 | * For the local data cache to be coherent the threads must also have | |
192 | * GCOn enabled. | |
193 | */ | |
194 | dcpart_new |= SYSC_DCPART_GCON_BIT; | |
195 | metag_out32(dcpart_new, SYSC_DCPART(this_thread)); | |
196 | #endif | |
197 | metag_out32(dcpart_new, SYSC_DCPART(thread)); | |
198 | /* Share icache partition too */ | |
199 | icpart_new = metag_in32(SYSC_ICPART(this_thread)); | |
200 | icpart_old = metag_in32(SYSC_ICPART(thread)); | |
201 | metag_out32(icpart_new, SYSC_ICPART(thread)); | |
202 | __global_unlock2(lflags); | |
203 | ||
204 | /* | |
205 | * Log if the cache partitions were altered so the user is aware of any | |
206 | * potential unintentional cache wastage. | |
207 | */ | |
208 | dcsz = get_dcache_size(); | |
209 | icsz = get_dcache_size(); | |
210 | describe_cachepart_change(this_thread, "dcache", dcsz, | |
211 | dcpart_this, dcpart_new); | |
212 | describe_cachepart_change(thread, "dcache", dcsz, | |
213 | dcpart_old, dcpart_new); | |
214 | describe_cachepart_change(thread, "icache", icsz, | |
215 | icpart_old, icpart_new); | |
216 | } | |
217 | ||
54be16e7 | 218 | int __cpu_up(unsigned int cpu, struct task_struct *idle) |
42682c6c JH |
219 | { |
220 | unsigned int thread = cpu_2_hwthread_id[cpu]; | |
221 | int ret; | |
222 | ||
223 | load_pgd(swapper_pg_dir, thread); | |
224 | ||
225 | flush_tlb_all(); | |
226 | ||
9e712963 JH |
227 | setup_smp_cache(thread); |
228 | ||
42682c6c JH |
229 | /* |
230 | * Tell the secondary CPU where to find its idle thread's stack. | |
231 | */ | |
232 | secondary_data_stack = task_stack_page(idle); | |
233 | ||
234 | wmb(); | |
235 | ||
236 | /* | |
237 | * Now bring the CPU into our world. | |
238 | */ | |
239 | ret = boot_secondary(thread, idle); | |
240 | if (ret == 0) { | |
42682c6c JH |
241 | /* |
242 | * CPU was successfully started, wait for it | |
243 | * to come online or time out. | |
244 | */ | |
96498144 JH |
245 | wait_for_completion_timeout(&cpu_running, |
246 | msecs_to_jiffies(1000)); | |
42682c6c JH |
247 | |
248 | if (!cpu_online(cpu)) | |
249 | ret = -EIO; | |
250 | } | |
251 | ||
252 | secondary_data_stack = NULL; | |
253 | ||
254 | if (ret) { | |
255 | pr_crit("CPU%u: processor failed to boot\n", cpu); | |
256 | ||
257 | /* | |
258 | * FIXME: We need to clean up the new idle thread. --rmk | |
259 | */ | |
260 | } | |
261 | ||
262 | return ret; | |
263 | } | |
264 | ||
265 | #ifdef CONFIG_HOTPLUG_CPU | |
42682c6c JH |
266 | |
267 | /* | |
268 | * __cpu_disable runs on the processor to be shutdown. | |
269 | */ | |
54be16e7 | 270 | int __cpu_disable(void) |
42682c6c JH |
271 | { |
272 | unsigned int cpu = smp_processor_id(); | |
42682c6c JH |
273 | |
274 | /* | |
275 | * Take this CPU offline. Once we clear this, we can't return, | |
276 | * and we must not schedule until we're ready to give up the cpu. | |
277 | */ | |
278 | set_cpu_online(cpu, false); | |
279 | ||
280 | /* | |
281 | * OK - migrate IRQs away from this CPU | |
282 | */ | |
283 | migrate_irqs(); | |
284 | ||
285 | /* | |
286 | * Flush user cache and TLB mappings, and then remove this CPU | |
287 | * from the vm mask set of all processes. | |
288 | */ | |
289 | flush_cache_all(); | |
290 | local_flush_tlb_all(); | |
291 | ||
42748752 | 292 | clear_tasks_mm_cpumask(cpu); |
42682c6c JH |
293 | |
294 | return 0; | |
295 | } | |
296 | ||
297 | /* | |
298 | * called on the thread which is asking for a CPU to be shutdown - | |
299 | * waits until shutdown has completed, or it is timed out. | |
300 | */ | |
54be16e7 | 301 | void __cpu_die(unsigned int cpu) |
42682c6c | 302 | { |
490ab882 | 303 | if (!cpu_wait_death(cpu, 1)) |
42682c6c JH |
304 | pr_err("CPU%u: unable to kill\n", cpu); |
305 | } | |
306 | ||
307 | /* | |
308 | * Called from the idle thread for the CPU which has been shutdown. | |
309 | * | |
310 | * Note that we do not return from this function. If this cpu is | |
311 | * brought online again it will need to run secondary_startup(). | |
312 | */ | |
54be16e7 | 313 | void cpu_die(void) |
42682c6c JH |
314 | { |
315 | local_irq_disable(); | |
316 | idle_task_exit(); | |
928df02b | 317 | irq_ctx_exit(smp_processor_id()); |
42682c6c | 318 | |
490ab882 | 319 | (void)cpu_report_death(); |
42682c6c JH |
320 | |
321 | asm ("XOR TXENABLE, D0Re0,D0Re0\n"); | |
322 | } | |
323 | #endif /* CONFIG_HOTPLUG_CPU */ | |
324 | ||
325 | /* | |
326 | * Called by both boot and secondaries to move global data into | |
327 | * per-processor storage. | |
328 | */ | |
54be16e7 | 329 | void smp_store_cpu_info(unsigned int cpuid) |
42682c6c JH |
330 | { |
331 | struct cpuinfo_metag *cpu_info = &per_cpu(cpu_data, cpuid); | |
332 | ||
333 | cpu_info->loops_per_jiffy = loops_per_jiffy; | |
334 | } | |
335 | ||
336 | /* | |
337 | * This is the secondary CPU boot entry. We're using this CPUs | |
338 | * idle thread stack and the global page tables. | |
339 | */ | |
340 | asmlinkage void secondary_start_kernel(void) | |
341 | { | |
342 | struct mm_struct *mm = &init_mm; | |
343 | unsigned int cpu = smp_processor_id(); | |
344 | ||
345 | /* | |
346 | * All kernel threads share the same mm context; grab a | |
347 | * reference and switch to it. | |
348 | */ | |
3fce371b | 349 | mmget(mm); |
f1f10076 | 350 | mmgrab(mm); |
42682c6c JH |
351 | current->active_mm = mm; |
352 | cpumask_set_cpu(cpu, mm_cpumask(mm)); | |
353 | enter_lazy_tlb(mm, current); | |
354 | local_flush_tlb_all(); | |
355 | ||
356 | /* | |
357 | * TODO: Some day it might be useful for each Linux CPU to | |
358 | * have its own TBI structure. That would allow each Linux CPU | |
359 | * to run different interrupt handlers for the same IRQ | |
360 | * number. | |
361 | * | |
362 | * For now, simply copying the pointer to the boot CPU's TBI | |
363 | * structure is sufficient because we always want to run the | |
364 | * same interrupt handler whatever CPU takes the interrupt. | |
365 | */ | |
366 | per_cpu(pTBI, cpu) = __TBI(TBID_ISTAT_BIT); | |
367 | ||
368 | if (!per_cpu(pTBI, cpu)) | |
369 | panic("No TBI found!"); | |
370 | ||
371 | per_cpu_trap_init(cpu); | |
928df02b | 372 | irq_ctx_init(cpu); |
42682c6c JH |
373 | |
374 | preempt_disable(); | |
375 | ||
3d6b7bb0 | 376 | setup_priv(); |
42682c6c | 377 | |
42682c6c | 378 | notify_cpu_starting(cpu); |
42682c6c JH |
379 | |
380 | pr_info("CPU%u (thread %u): Booted secondary processor\n", | |
381 | cpu, cpu_2_hwthread_id[cpu]); | |
382 | ||
383 | calibrate_delay(); | |
384 | smp_store_cpu_info(cpu); | |
385 | ||
386 | /* | |
387 | * OK, now it's safe to let the boot CPU continue | |
388 | */ | |
389 | set_cpu_online(cpu, true); | |
96498144 | 390 | complete(&cpu_running); |
42682c6c | 391 | |
234c7f1a JH |
392 | /* |
393 | * Enable local interrupts. | |
394 | */ | |
395 | tbi_startup_interrupt(TBID_SIGNUM_TRT); | |
396 | local_irq_enable(); | |
397 | ||
42682c6c JH |
398 | /* |
399 | * OK, it's off to the idle thread for us | |
400 | */ | |
fc6d73d6 | 401 | cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); |
42682c6c JH |
402 | } |
403 | ||
404 | void __init smp_cpus_done(unsigned int max_cpus) | |
405 | { | |
406 | int cpu; | |
407 | unsigned long bogosum = 0; | |
408 | ||
409 | for_each_online_cpu(cpu) | |
410 | bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; | |
411 | ||
412 | pr_info("SMP: Total of %d processors activated (%lu.%02lu BogoMIPS).\n", | |
413 | num_online_cpus(), | |
414 | bogosum / (500000/HZ), | |
415 | (bogosum / (5000/HZ)) % 100); | |
416 | } | |
417 | ||
418 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
419 | { | |
420 | unsigned int cpu = smp_processor_id(); | |
421 | ||
422 | init_new_context(current, &init_mm); | |
423 | current_thread_info()->cpu = cpu; | |
424 | ||
425 | smp_store_cpu_info(cpu); | |
426 | init_cpu_present(cpu_possible_mask); | |
427 | } | |
428 | ||
429 | void __init smp_prepare_boot_cpu(void) | |
430 | { | |
431 | unsigned int cpu = smp_processor_id(); | |
432 | ||
433 | per_cpu(pTBI, cpu) = __TBI(TBID_ISTAT_BIT); | |
434 | ||
435 | if (!per_cpu(pTBI, cpu)) | |
436 | panic("No TBI found!"); | |
437 | } | |
438 | ||
439 | static void smp_cross_call(cpumask_t callmap, enum ipi_msg_type msg); | |
440 | ||
441 | static void send_ipi_message(const struct cpumask *mask, enum ipi_msg_type msg) | |
442 | { | |
443 | unsigned long flags; | |
444 | unsigned int cpu; | |
445 | cpumask_t map; | |
446 | ||
447 | cpumask_clear(&map); | |
448 | local_irq_save(flags); | |
449 | ||
450 | for_each_cpu(cpu, mask) { | |
451 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); | |
452 | ||
453 | spin_lock(&ipi->lock); | |
454 | ||
455 | /* | |
456 | * KICK interrupts are queued in hardware so we'll get | |
457 | * multiple interrupts if we call smp_cross_call() | |
458 | * multiple times for one msg. The problem is that we | |
459 | * only have one bit for each message - we can't queue | |
460 | * them in software. | |
461 | * | |
462 | * The first time through ipi_handler() we'll clear | |
463 | * the msg bit, having done all the work. But when we | |
464 | * return we'll get _another_ interrupt (and another, | |
465 | * and another until we've handled all the queued | |
466 | * KICKs). Running ipi_handler() when there's no work | |
467 | * to do is bad because that's how kick handler | |
468 | * chaining detects who the KICK was intended for. | |
469 | * See arch/metag/kernel/kick.c for more details. | |
470 | * | |
471 | * So only add 'cpu' to 'map' if we haven't already | |
472 | * queued a KICK interrupt for 'msg'. | |
473 | */ | |
474 | if (!(ipi->bits & (1 << msg))) { | |
475 | ipi->bits |= 1 << msg; | |
476 | cpumask_set_cpu(cpu, &map); | |
477 | } | |
478 | ||
479 | spin_unlock(&ipi->lock); | |
480 | } | |
481 | ||
482 | /* | |
483 | * Call the platform specific cross-CPU call function. | |
484 | */ | |
485 | smp_cross_call(map, msg); | |
486 | ||
487 | local_irq_restore(flags); | |
488 | } | |
489 | ||
490 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) | |
491 | { | |
492 | send_ipi_message(mask, IPI_CALL_FUNC); | |
493 | } | |
494 | ||
495 | void arch_send_call_function_single_ipi(int cpu) | |
496 | { | |
1d61cf12 | 497 | send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC); |
42682c6c JH |
498 | } |
499 | ||
500 | void show_ipi_list(struct seq_file *p) | |
501 | { | |
502 | unsigned int cpu; | |
503 | ||
504 | seq_puts(p, "IPI:"); | |
505 | ||
506 | for_each_present_cpu(cpu) | |
507 | seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count); | |
508 | ||
509 | seq_putc(p, '\n'); | |
510 | } | |
511 | ||
512 | static DEFINE_SPINLOCK(stop_lock); | |
513 | ||
514 | /* | |
515 | * Main handler for inter-processor interrupts | |
516 | * | |
517 | * For Meta, the ipimask now only identifies a single | |
518 | * category of IPI (Bit 1 IPIs have been replaced by a | |
519 | * different mechanism): | |
520 | * | |
521 | * Bit 0 - Inter-processor function call | |
522 | */ | |
5a25f7bb | 523 | static int do_IPI(void) |
42682c6c JH |
524 | { |
525 | unsigned int cpu = smp_processor_id(); | |
526 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); | |
42682c6c JH |
527 | unsigned long msgs, nextmsg; |
528 | int handled = 0; | |
529 | ||
530 | ipi->ipi_count++; | |
531 | ||
532 | spin_lock(&ipi->lock); | |
533 | msgs = ipi->bits; | |
534 | nextmsg = msgs & -msgs; | |
535 | ipi->bits &= ~nextmsg; | |
536 | spin_unlock(&ipi->lock); | |
537 | ||
538 | if (nextmsg) { | |
539 | handled = 1; | |
540 | ||
541 | nextmsg = ffz(~nextmsg); | |
542 | switch (nextmsg) { | |
543 | case IPI_RESCHEDULE: | |
544 | scheduler_ipi(); | |
545 | break; | |
546 | ||
547 | case IPI_CALL_FUNC: | |
548 | generic_smp_call_function_interrupt(); | |
549 | break; | |
550 | ||
42682c6c JH |
551 | default: |
552 | pr_crit("CPU%u: Unknown IPI message 0x%lx\n", | |
553 | cpu, nextmsg); | |
554 | break; | |
555 | } | |
556 | } | |
557 | ||
42682c6c JH |
558 | return handled; |
559 | } | |
560 | ||
561 | void smp_send_reschedule(int cpu) | |
562 | { | |
563 | send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE); | |
564 | } | |
565 | ||
566 | static void stop_this_cpu(void *data) | |
567 | { | |
568 | unsigned int cpu = smp_processor_id(); | |
569 | ||
570 | if (system_state == SYSTEM_BOOTING || | |
571 | system_state == SYSTEM_RUNNING) { | |
572 | spin_lock(&stop_lock); | |
573 | pr_crit("CPU%u: stopping\n", cpu); | |
574 | dump_stack(); | |
575 | spin_unlock(&stop_lock); | |
576 | } | |
577 | ||
578 | set_cpu_online(cpu, false); | |
579 | ||
580 | local_irq_disable(); | |
581 | ||
582 | hard_processor_halt(HALT_OK); | |
583 | } | |
584 | ||
585 | void smp_send_stop(void) | |
586 | { | |
587 | smp_call_function(stop_this_cpu, NULL, 0); | |
588 | } | |
589 | ||
590 | /* | |
591 | * not supported here | |
592 | */ | |
593 | int setup_profiling_timer(unsigned int multiplier) | |
594 | { | |
595 | return -EINVAL; | |
596 | } | |
597 | ||
598 | /* | |
599 | * We use KICKs for inter-processor interrupts. | |
600 | * | |
601 | * For every CPU in "callmap" the IPI data must already have been | |
602 | * stored in that CPU's "ipi_data" member prior to calling this | |
603 | * function. | |
604 | */ | |
605 | static void kick_raise_softirq(cpumask_t callmap, unsigned int irq) | |
606 | { | |
607 | int cpu; | |
608 | ||
609 | for_each_cpu(cpu, &callmap) { | |
610 | unsigned int thread; | |
611 | ||
612 | thread = cpu_2_hwthread_id[cpu]; | |
613 | ||
614 | BUG_ON(thread == BAD_HWTHREAD_ID); | |
615 | ||
616 | metag_out32(1, T0KICKI + (thread * TnXKICK_STRIDE)); | |
617 | } | |
618 | } | |
619 | ||
620 | static TBIRES ipi_handler(TBIRES State, int SigNum, int Triggers, | |
621 | int Inst, PTBI pTBI, int *handled) | |
622 | { | |
5a25f7bb | 623 | *handled = do_IPI(); |
42682c6c JH |
624 | |
625 | return State; | |
626 | } | |
627 | ||
628 | static struct kick_irq_handler ipi_irq = { | |
629 | .func = ipi_handler, | |
630 | }; | |
631 | ||
632 | static void smp_cross_call(cpumask_t callmap, enum ipi_msg_type msg) | |
633 | { | |
634 | kick_raise_softirq(callmap, 1); | |
635 | } | |
636 | ||
637 | static inline unsigned int get_core_count(void) | |
638 | { | |
639 | int i; | |
640 | unsigned int ret = 0; | |
641 | ||
642 | for (i = 0; i < CONFIG_NR_CPUS; i++) { | |
643 | if (core_reg_read(TXUCT_ID, TXENABLE_REGNUM, i)) | |
644 | ret++; | |
645 | } | |
646 | ||
647 | return ret; | |
648 | } | |
649 | ||
650 | /* | |
651 | * Initialise the CPU possible map early - this describes the CPUs | |
652 | * which may be present or become present in the system. | |
653 | */ | |
654 | void __init smp_init_cpus(void) | |
655 | { | |
656 | unsigned int i, ncores = get_core_count(); | |
657 | ||
658 | /* If no hwthread_map early param was set use default mapping */ | |
659 | for (i = 0; i < NR_CPUS; i++) | |
660 | if (cpu_2_hwthread_id[i] == BAD_HWTHREAD_ID) { | |
661 | cpu_2_hwthread_id[i] = i; | |
662 | hwthread_id_2_cpu[i] = i; | |
663 | } | |
664 | ||
665 | for (i = 0; i < ncores; i++) | |
666 | set_cpu_possible(i, true); | |
667 | ||
668 | kick_register_func(&ipi_irq); | |
669 | } |