1// SPDX-License-Identifier: GPL-2.0
2/* smp.c: Sparc64 SMP support.
3 *
4 * Copyright (C) 1997, 2007, 2008 David S. Miller (davem@davemloft.net)
5 */
6
7#include <linux/export.h>
8#include <linux/kernel.h>
9#include <linux/sched/mm.h>
10#include <linux/sched/hotplug.h>
11#include <linux/mm.h>
12#include <linux/pagemap.h>
13#include <linux/threads.h>
14#include <linux/smp.h>
15#include <linux/interrupt.h>
16#include <linux/kernel_stat.h>
17#include <linux/delay.h>
18#include <linux/init.h>
19#include <linux/spinlock.h>
20#include <linux/fs.h>
21#include <linux/seq_file.h>
22#include <linux/cache.h>
23#include <linux/jiffies.h>
24#include <linux/profile.h>
25#include <linux/memblock.h>
26#include <linux/vmalloc.h>
27#include <linux/ftrace.h>
28#include <linux/cpu.h>
29#include <linux/slab.h>
30#include <linux/kgdb.h>
31
32#include <asm/head.h>
33#include <asm/ptrace.h>
34#include <linux/atomic.h>
35#include <asm/tlbflush.h>
36#include <asm/mmu_context.h>
37#include <asm/cpudata.h>
38#include <asm/hvtramp.h>
39#include <asm/io.h>
40#include <asm/timer.h>
41#include <asm/setup.h>
42
43#include <asm/irq.h>
44#include <asm/irq_regs.h>
45#include <asm/page.h>
46#include <asm/oplib.h>
47#include <linux/uaccess.h>
48#include <asm/starfire.h>
49#include <asm/tlb.h>
50#include <asm/pgalloc.h>
51#include <asm/sections.h>
52#include <asm/prom.h>
53#include <asm/mdesc.h>
54#include <asm/ldc.h>
55#include <asm/hypervisor.h>
56#include <asm/pcr.h>
57
58#include "cpumap.h"
59#include "kernel.h"
60
61DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE;
62cpumask_t cpu_core_map[NR_CPUS] __read_mostly =
63 { [0 ... NR_CPUS-1] = CPU_MASK_NONE };
64
65cpumask_t cpu_core_sib_map[NR_CPUS] __read_mostly = {
66 [0 ... NR_CPUS-1] = CPU_MASK_NONE };
67
68cpumask_t cpu_core_sib_cache_map[NR_CPUS] __read_mostly = {
69 [0 ... NR_CPUS - 1] = CPU_MASK_NONE };
70
71EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
72EXPORT_SYMBOL(cpu_core_map);
73EXPORT_SYMBOL(cpu_core_sib_map);
74EXPORT_SYMBOL(cpu_core_sib_cache_map);
75
76static cpumask_t smp_commenced_mask;
77
78static DEFINE_PER_CPU(bool, poke);
79static bool cpu_poke;
80
81void smp_info(struct seq_file *m)
82{
83 int i;
84
85 seq_printf(m, fmt: "State:\n");
86 for_each_online_cpu(i)
87 seq_printf(m, fmt: "CPU%d:\t\tonline\n", i);
88}
89
90void smp_bogo(struct seq_file *m)
91{
92 int i;
93
94 for_each_online_cpu(i)
95 seq_printf(m,
96 fmt: "Cpu%dClkTck\t: %016lx\n",
97 i, cpu_data(i).clock_tick);
98}
99
100extern void setup_sparc64_timer(void);
101
102static volatile unsigned long callin_flag = 0;
103
104void smp_callin(void)
105{
106 int cpuid = hard_smp_processor_id();
107
108 __local_per_cpu_offset = __per_cpu_offset(cpuid);
109
110 if (tlb_type == hypervisor)
111 sun4v_ktsb_register();
112
113 __flush_tlb_all();
114
115 setup_sparc64_timer();
116
117 if (cheetah_pcache_forced_on)
118 cheetah_enable_pcache();
119
120 callin_flag = 1;
121 __asm__ __volatile__("membar #Sync\n\t"
122 "flush %%g6" : : : "memory");
123
124 /* Clear this or we will die instantly when we
125 * schedule back to this idler...
126 */
127 current_thread_info()->new_child = 0;
128
129 /* Attach to the address space of init_task. */
130 mmgrab(mm: &init_mm);
131 current->active_mm = &init_mm;
132
133 /* inform the notifiers about the new cpu */
134 notify_cpu_starting(cpu: cpuid);
135
136 while (!cpumask_test_cpu(cpu: cpuid, cpumask: &smp_commenced_mask))
137 rmb();
138
139 set_cpu_online(cpu: cpuid, online: true);
140
141 local_irq_enable();
142
143 cpu_startup_entry(state: CPUHP_AP_ONLINE_IDLE);
144}
145
146void cpu_panic(void)
147{
148 printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
149 panic(fmt: "SMP bolixed\n");
150}
151
152/* This tick register synchronization scheme is taken entirely from
153 * the ia64 port, see arch/ia64/kernel/smpboot.c for details and credit.
154 *
155 * The only change I've made is to rework it so that the master
156 * initiates the synchonization instead of the slave. -DaveM
157 */
158
159#define MASTER 0
160#define SLAVE (SMP_CACHE_BYTES/sizeof(unsigned long))
161
162#define NUM_ROUNDS 64 /* magic value */
163#define NUM_ITERS 5 /* likewise */
164
165static DEFINE_RAW_SPINLOCK(itc_sync_lock);
166static unsigned long go[SLAVE + 1];
167
168#define DEBUG_TICK_SYNC 0
169
170static inline long get_delta (long *rt, long *master)
171{
172 unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0;
173 unsigned long tcenter, t0, t1, tm;
174 unsigned long i;
175
176 for (i = 0; i < NUM_ITERS; i++) {
177 t0 = tick_ops->get_tick();
178 go[MASTER] = 1;
179 membar_safe("#StoreLoad");
180 while (!(tm = go[SLAVE]))
181 rmb();
182 go[SLAVE] = 0;
183 wmb();
184 t1 = tick_ops->get_tick();
185
186 if (t1 - t0 < best_t1 - best_t0)
187 best_t0 = t0, best_t1 = t1, best_tm = tm;
188 }
189
190 *rt = best_t1 - best_t0;
191 *master = best_tm - best_t0;
192
193 /* average best_t0 and best_t1 without overflow: */
194 tcenter = (best_t0/2 + best_t1/2);
195 if (best_t0 % 2 + best_t1 % 2 == 2)
196 tcenter++;
197 return tcenter - best_tm;
198}
199
200void smp_synchronize_tick_client(void)
201{
202 long i, delta, adj, adjust_latency = 0, done = 0;
203 unsigned long flags, rt, master_time_stamp;
204#if DEBUG_TICK_SYNC
205 struct {
206 long rt; /* roundtrip time */
207 long master; /* master's timestamp */
208 long diff; /* difference between midpoint and master's timestamp */
209 long lat; /* estimate of itc adjustment latency */
210 } t[NUM_ROUNDS];
211#endif
212
213 go[MASTER] = 1;
214
215 while (go[MASTER])
216 rmb();
217
218 local_irq_save(flags);
219 {
220 for (i = 0; i < NUM_ROUNDS; i++) {
221 delta = get_delta(rt: &rt, master: &master_time_stamp);
222 if (delta == 0)
223 done = 1; /* let's lock on to this... */
224
225 if (!done) {
226 if (i > 0) {
227 adjust_latency += -delta;
228 adj = -delta + adjust_latency/4;
229 } else
230 adj = -delta;
231
232 tick_ops->add_tick(adj);
233 }
234#if DEBUG_TICK_SYNC
235 t[i].rt = rt;
236 t[i].master = master_time_stamp;
237 t[i].diff = delta;
238 t[i].lat = adjust_latency/4;
239#endif
240 }
241 }
242 local_irq_restore(flags);
243
244#if DEBUG_TICK_SYNC
245 for (i = 0; i < NUM_ROUNDS; i++)
246 printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n",
247 t[i].rt, t[i].master, t[i].diff, t[i].lat);
248#endif
249
250 printk(KERN_INFO "CPU %d: synchronized TICK with master CPU "
251 "(last diff %ld cycles, maxerr %lu cycles)\n",
252 smp_processor_id(), delta, rt);
253}
254
255static void smp_start_sync_tick_client(int cpu);
256
257static void smp_synchronize_one_tick(int cpu)
258{
259 unsigned long flags, i;
260
261 go[MASTER] = 0;
262
263 smp_start_sync_tick_client(cpu);
264
265 /* wait for client to be ready */
266 while (!go[MASTER])
267 rmb();
268
269 /* now let the client proceed into his loop */
270 go[MASTER] = 0;
271 membar_safe("#StoreLoad");
272
273 raw_spin_lock_irqsave(&itc_sync_lock, flags);
274 {
275 for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) {
276 while (!go[MASTER])
277 rmb();
278 go[MASTER] = 0;
279 wmb();
280 go[SLAVE] = tick_ops->get_tick();
281 membar_safe("#StoreLoad");
282 }
283 }
284 raw_spin_unlock_irqrestore(&itc_sync_lock, flags);
285}
286
287#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
288static void ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg,
289 void **descrp)
290{
291 extern unsigned long sparc64_ttable_tl0;
292 extern unsigned long kern_locked_tte_data;
293 struct hvtramp_descr *hdesc;
294 unsigned long trampoline_ra;
295 struct trap_per_cpu *tb;
296 u64 tte_vaddr, tte_data;
297 unsigned long hv_err;
298 int i;
299
300 hdesc = kzalloc(sizeof(*hdesc) +
301 (sizeof(struct hvtramp_mapping) *
302 num_kernel_image_mappings - 1),
303 GFP_KERNEL);
304 if (!hdesc) {
305 printk(KERN_ERR "ldom_startcpu_cpuid: Cannot allocate "
306 "hvtramp_descr.\n");
307 return;
308 }
309 *descrp = hdesc;
310
311 hdesc->cpu = cpu;
312 hdesc->num_mappings = num_kernel_image_mappings;
313
314 tb = &trap_block[cpu];
315
316 hdesc->fault_info_va = (unsigned long) &tb->fault_info;
317 hdesc->fault_info_pa = kimage_addr_to_ra(&tb->fault_info);
318
319 hdesc->thread_reg = thread_reg;
320
321 tte_vaddr = (unsigned long) KERNBASE;
322 tte_data = kern_locked_tte_data;
323
324 for (i = 0; i < hdesc->num_mappings; i++) {
325 hdesc->maps[i].vaddr = tte_vaddr;
326 hdesc->maps[i].tte = tte_data;
327 tte_vaddr += 0x400000;
328 tte_data += 0x400000;
329 }
330
331 trampoline_ra = kimage_addr_to_ra(hv_cpu_startup);
332
333 hv_err = sun4v_cpu_start(cpu, trampoline_ra,
334 kimage_addr_to_ra(&sparc64_ttable_tl0),
335 __pa(hdesc));
336 if (hv_err)
337 printk(KERN_ERR "ldom_startcpu_cpuid: sun4v_cpu_start() "
338 "gives error %lu\n", hv_err);
339}
340#endif
341
342extern unsigned long sparc64_cpu_startup;
343
344/* The OBP cpu startup callback truncates the 3rd arg cookie to
345 * 32-bits (I think) so to be safe we have it read the pointer
346 * contained here so we work on >4GB machines. -DaveM
347 */
348static struct thread_info *cpu_new_thread = NULL;
349
350static int smp_boot_one_cpu(unsigned int cpu, struct task_struct *idle)
351{
352 unsigned long entry =
353 (unsigned long)(&sparc64_cpu_startup);
354 unsigned long cookie =
355 (unsigned long)(&cpu_new_thread);
356 void *descr = NULL;
357 int timeout, ret;
358
359 callin_flag = 0;
360 cpu_new_thread = task_thread_info(idle);
361
362 if (tlb_type == hypervisor) {
363#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
364 if (ldom_domaining_enabled)
365 ldom_startcpu_cpuid(cpu,
366 (unsigned long) cpu_new_thread,
367 &descr);
368 else
369#endif
370 prom_startcpu_cpuid(cpu, entry, cookie);
371 } else {
372 struct device_node *dp = of_find_node_by_cpuid(cpu);
373
374 prom_startcpu(dp->phandle, entry, cookie);
375 }
376
377 for (timeout = 0; timeout < 50000; timeout++) {
378 if (callin_flag)
379 break;
380 udelay(100);
381 }
382
383 if (callin_flag) {
384 ret = 0;
385 } else {
386 printk("Processor %d is stuck.\n", cpu);
387 ret = -ENODEV;
388 }
389 cpu_new_thread = NULL;
390
391 kfree(objp: descr);
392
393 return ret;
394}
395
396static void spitfire_xcall_helper(u64 data0, u64 data1, u64 data2, u64 pstate, unsigned long cpu)
397{
398 u64 result, target;
399 int stuck, tmp;
400
401 if (this_is_starfire) {
402 /* map to real upaid */
403 cpu = (((cpu & 0x3c) << 1) |
404 ((cpu & 0x40) >> 4) |
405 (cpu & 0x3));
406 }
407
408 target = (cpu << 14) | 0x70;
409again:
410 /* Ok, this is the real Spitfire Errata #54.
411 * One must read back from a UDB internal register
412 * after writes to the UDB interrupt dispatch, but
413 * before the membar Sync for that write.
414 * So we use the high UDB control register (ASI 0x7f,
415 * ADDR 0x20) for the dummy read. -DaveM
416 */
417 tmp = 0x40;
418 __asm__ __volatile__(
419 "wrpr %1, %2, %%pstate\n\t"
420 "stxa %4, [%0] %3\n\t"
421 "stxa %5, [%0+%8] %3\n\t"
422 "add %0, %8, %0\n\t"
423 "stxa %6, [%0+%8] %3\n\t"
424 "membar #Sync\n\t"
425 "stxa %%g0, [%7] %3\n\t"
426 "membar #Sync\n\t"
427 "mov 0x20, %%g1\n\t"
428 "ldxa [%%g1] 0x7f, %%g0\n\t"
429 "membar #Sync"
430 : "=r" (tmp)
431 : "r" (pstate), "i" (PSTATE_IE), "i" (ASI_INTR_W),
432 "r" (data0), "r" (data1), "r" (data2), "r" (target),
433 "r" (0x10), "0" (tmp)
434 : "g1");
435
436 /* NOTE: PSTATE_IE is still clear. */
437 stuck = 100000;
438 do {
439 __asm__ __volatile__("ldxa [%%g0] %1, %0"
440 : "=r" (result)
441 : "i" (ASI_INTR_DISPATCH_STAT));
442 if (result == 0) {
443 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
444 : : "r" (pstate));
445 return;
446 }
447 stuck -= 1;
448 if (stuck == 0)
449 break;
450 } while (result & 0x1);
451 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
452 : : "r" (pstate));
453 if (stuck == 0) {
454 printk("CPU[%d]: mondo stuckage result[%016llx]\n",
455 smp_processor_id(), result);
456 } else {
457 udelay(2);
458 goto again;
459 }
460}
461
462static void spitfire_xcall_deliver(struct trap_per_cpu *tb, int cnt)
463{
464 u64 *mondo, data0, data1, data2;
465 u16 *cpu_list;
466 u64 pstate;
467 int i;
468
469 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
470 cpu_list = __va(tb->cpu_list_pa);
471 mondo = __va(tb->cpu_mondo_block_pa);
472 data0 = mondo[0];
473 data1 = mondo[1];
474 data2 = mondo[2];
475 for (i = 0; i < cnt; i++)
476 spitfire_xcall_helper(data0, data1, data2, pstate, cpu: cpu_list[i]);
477}
478
479/* Cheetah now allows to send the whole 64-bytes of data in the interrupt
480 * packet, but we have no use for that. However we do take advantage of
481 * the new pipelining feature (ie. dispatch to multiple cpus simultaneously).
482 */
483static void cheetah_xcall_deliver(struct trap_per_cpu *tb, int cnt)
484{
485 int nack_busy_id, is_jbus, need_more;
486 u64 *mondo, pstate, ver, busy_mask;
487 u16 *cpu_list;
488
489 cpu_list = __va(tb->cpu_list_pa);
490 mondo = __va(tb->cpu_mondo_block_pa);
491
492 /* Unfortunately, someone at Sun had the brilliant idea to make the
493 * busy/nack fields hard-coded by ITID number for this Ultra-III
494 * derivative processor.
495 */
496 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
497 is_jbus = ((ver >> 32) == __JALAPENO_ID ||
498 (ver >> 32) == __SERRANO_ID);
499
500 __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
501
502retry:
503 need_more = 0;
504 __asm__ __volatile__("wrpr %0, %1, %%pstate\n\t"
505 : : "r" (pstate), "i" (PSTATE_IE));
506
507 /* Setup the dispatch data registers. */
508 __asm__ __volatile__("stxa %0, [%3] %6\n\t"
509 "stxa %1, [%4] %6\n\t"
510 "stxa %2, [%5] %6\n\t"
511 "membar #Sync\n\t"
512 : /* no outputs */
513 : "r" (mondo[0]), "r" (mondo[1]), "r" (mondo[2]),
514 "r" (0x40), "r" (0x50), "r" (0x60),
515 "i" (ASI_INTR_W));
516
517 nack_busy_id = 0;
518 busy_mask = 0;
519 {
520 int i;
521
522 for (i = 0; i < cnt; i++) {
523 u64 target, nr;
524
525 nr = cpu_list[i];
526 if (nr == 0xffff)
527 continue;
528
529 target = (nr << 14) | 0x70;
530 if (is_jbus) {
531 busy_mask |= (0x1UL << (nr * 2));
532 } else {
533 target |= (nack_busy_id << 24);
534 busy_mask |= (0x1UL <<
535 (nack_busy_id * 2));
536 }
537 __asm__ __volatile__(
538 "stxa %%g0, [%0] %1\n\t"
539 "membar #Sync\n\t"
540 : /* no outputs */
541 : "r" (target), "i" (ASI_INTR_W));
542 nack_busy_id++;
543 if (nack_busy_id == 32) {
544 need_more = 1;
545 break;
546 }
547 }
548 }
549
550 /* Now, poll for completion. */
551 {
552 u64 dispatch_stat, nack_mask;
553 long stuck;
554
555 stuck = 100000 * nack_busy_id;
556 nack_mask = busy_mask << 1;
557 do {
558 __asm__ __volatile__("ldxa [%%g0] %1, %0"
559 : "=r" (dispatch_stat)
560 : "i" (ASI_INTR_DISPATCH_STAT));
561 if (!(dispatch_stat & (busy_mask | nack_mask))) {
562 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
563 : : "r" (pstate));
564 if (unlikely(need_more)) {
565 int i, this_cnt = 0;
566 for (i = 0; i < cnt; i++) {
567 if (cpu_list[i] == 0xffff)
568 continue;
569 cpu_list[i] = 0xffff;
570 this_cnt++;
571 if (this_cnt == 32)
572 break;
573 }
574 goto retry;
575 }
576 return;
577 }
578 if (!--stuck)
579 break;
580 } while (dispatch_stat & busy_mask);
581
582 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
583 : : "r" (pstate));
584
585 if (dispatch_stat & busy_mask) {
586 /* Busy bits will not clear, continue instead
587 * of freezing up on this cpu.
588 */
589 printk("CPU[%d]: mondo stuckage result[%016llx]\n",
590 smp_processor_id(), dispatch_stat);
591 } else {
592 int i, this_busy_nack = 0;
593
594 /* Delay some random time with interrupts enabled
595 * to prevent deadlock.
596 */
597 udelay(2 * nack_busy_id);
598
599 /* Clear out the mask bits for cpus which did not
600 * NACK us.
601 */
602 for (i = 0; i < cnt; i++) {
603 u64 check_mask, nr;
604
605 nr = cpu_list[i];
606 if (nr == 0xffff)
607 continue;
608
609 if (is_jbus)
610 check_mask = (0x2UL << (2*nr));
611 else
612 check_mask = (0x2UL <<
613 this_busy_nack);
614 if ((dispatch_stat & check_mask) == 0)
615 cpu_list[i] = 0xffff;
616 this_busy_nack += 2;
617 if (this_busy_nack == 64)
618 break;
619 }
620
621 goto retry;
622 }
623 }
624}
625
626#define CPU_MONDO_COUNTER(cpuid) (cpu_mondo_counter[cpuid])
627#define MONDO_USEC_WAIT_MIN 2
628#define MONDO_USEC_WAIT_MAX 100
629#define MONDO_RETRY_LIMIT 500000
630
631/* Multi-cpu list version.
632 *
633 * Deliver xcalls to 'cnt' number of cpus in 'cpu_list'.
634 * Sometimes not all cpus receive the mondo, requiring us to re-send
635 * the mondo until all cpus have received, or cpus are truly stuck
636 * unable to receive mondo, and we timeout.
637 * Occasionally a target cpu strand is borrowed briefly by hypervisor to
638 * perform guest service, such as PCIe error handling. Consider the
639 * service time, 1 second overall wait is reasonable for 1 cpu.
640 * Here two in-between mondo check wait time are defined: 2 usec for
641 * single cpu quick turn around and up to 100usec for large cpu count.
642 * Deliver mondo to large number of cpus could take longer, we adjusts
643 * the retry count as long as target cpus are making forward progress.
644 */
645static void hypervisor_xcall_deliver(struct trap_per_cpu *tb, int cnt)
646{
647 int this_cpu, tot_cpus, prev_sent, i, rem;
648 int usec_wait, retries, tot_retries;
649 u16 first_cpu = 0xffff;
650 unsigned long xc_rcvd = 0;
651 unsigned long status;
652 int ecpuerror_id = 0;
653 int enocpu_id = 0;
654 u16 *cpu_list;
655 u16 cpu;
656
657 this_cpu = smp_processor_id();
658 cpu_list = __va(tb->cpu_list_pa);
659 usec_wait = cnt * MONDO_USEC_WAIT_MIN;
660 if (usec_wait > MONDO_USEC_WAIT_MAX)
661 usec_wait = MONDO_USEC_WAIT_MAX;
662 retries = tot_retries = 0;
663 tot_cpus = cnt;
664 prev_sent = 0;
665
666 do {
667 int n_sent, mondo_delivered, target_cpu_busy;
668
669 status = sun4v_cpu_mondo_send(cnt,
670 tb->cpu_list_pa,
671 tb->cpu_mondo_block_pa);
672
673 /* HV_EOK means all cpus received the xcall, we're done. */
674 if (likely(status == HV_EOK))
675 goto xcall_done;
676
677 /* If not these non-fatal errors, panic */
678 if (unlikely((status != HV_EWOULDBLOCK) &&
679 (status != HV_ECPUERROR) &&
680 (status != HV_ENOCPU)))
681 goto fatal_errors;
682
683 /* First, see if we made any forward progress.
684 *
685 * Go through the cpu_list, count the target cpus that have
686 * received our mondo (n_sent), and those that did not (rem).
687 * Re-pack cpu_list with the cpus remain to be retried in the
688 * front - this simplifies tracking the truly stalled cpus.
689 *
690 * The hypervisor indicates successful sends by setting
691 * cpu list entries to the value 0xffff.
692 *
693 * EWOULDBLOCK means some target cpus did not receive the
694 * mondo and retry usually helps.
695 *
696 * ECPUERROR means at least one target cpu is in error state,
697 * it's usually safe to skip the faulty cpu and retry.
698 *
699 * ENOCPU means one of the target cpu doesn't belong to the
700 * domain, perhaps offlined which is unexpected, but not
701 * fatal and it's okay to skip the offlined cpu.
702 */
703 rem = 0;
704 n_sent = 0;
705 for (i = 0; i < cnt; i++) {
706 cpu = cpu_list[i];
707 if (likely(cpu == 0xffff)) {
708 n_sent++;
709 } else if ((status == HV_ECPUERROR) &&
710 (sun4v_cpu_state(cpu) == HV_CPU_STATE_ERROR)) {
711 ecpuerror_id = cpu + 1;
712 } else if (status == HV_ENOCPU && !cpu_online(cpu)) {
713 enocpu_id = cpu + 1;
714 } else {
715 cpu_list[rem++] = cpu;
716 }
717 }
718
719 /* No cpu remained, we're done. */
720 if (rem == 0)
721 break;
722
723 /* Otherwise, update the cpu count for retry. */
724 cnt = rem;
725
726 /* Record the overall number of mondos received by the
727 * first of the remaining cpus.
728 */
729 if (first_cpu != cpu_list[0]) {
730 first_cpu = cpu_list[0];
731 xc_rcvd = CPU_MONDO_COUNTER(first_cpu);
732 }
733
734 /* Was any mondo delivered successfully? */
735 mondo_delivered = (n_sent > prev_sent);
736 prev_sent = n_sent;
737
738 /* or, was any target cpu busy processing other mondos? */
739 target_cpu_busy = (xc_rcvd < CPU_MONDO_COUNTER(first_cpu));
740 xc_rcvd = CPU_MONDO_COUNTER(first_cpu);
741
742 /* Retry count is for no progress. If we're making progress,
743 * reset the retry count.
744 */
745 if (likely(mondo_delivered || target_cpu_busy)) {
746 tot_retries += retries;
747 retries = 0;
748 } else if (unlikely(retries > MONDO_RETRY_LIMIT)) {
749 goto fatal_mondo_timeout;
750 }
751
752 /* Delay a little bit to let other cpus catch up on
753 * their cpu mondo queue work.
754 */
755 if (!mondo_delivered)
756 udelay(usec_wait);
757
758 retries++;
759 } while (1);
760
761xcall_done:
762 if (unlikely(ecpuerror_id > 0)) {
763 pr_crit("CPU[%d]: SUN4V mondo cpu error, target cpu(%d) was in error state\n",
764 this_cpu, ecpuerror_id - 1);
765 } else if (unlikely(enocpu_id > 0)) {
766 pr_crit("CPU[%d]: SUN4V mondo cpu error, target cpu(%d) does not belong to the domain\n",
767 this_cpu, enocpu_id - 1);
768 }
769 return;
770
771fatal_errors:
772 /* fatal errors include bad alignment, etc */
773 pr_crit("CPU[%d]: Args were cnt(%d) cpulist_pa(%lx) mondo_block_pa(%lx)\n",
774 this_cpu, tot_cpus, tb->cpu_list_pa, tb->cpu_mondo_block_pa);
775 panic(fmt: "Unexpected SUN4V mondo error %lu\n", status);
776
777fatal_mondo_timeout:
778 /* some cpus being non-responsive to the cpu mondo */
779 pr_crit("CPU[%d]: SUN4V mondo timeout, cpu(%d) made no forward progress after %d retries. Total target cpus(%d).\n",
780 this_cpu, first_cpu, (tot_retries + retries), tot_cpus);
781 panic(fmt: "SUN4V mondo timeout panic\n");
782}
783
784static void (*xcall_deliver_impl)(struct trap_per_cpu *, int);
785
786static void xcall_deliver(u64 data0, u64 data1, u64 data2, const cpumask_t *mask)
787{
788 struct trap_per_cpu *tb;
789 int this_cpu, i, cnt;
790 unsigned long flags;
791 u16 *cpu_list;
792 u64 *mondo;
793
794 /* We have to do this whole thing with interrupts fully disabled.
795 * Otherwise if we send an xcall from interrupt context it will
796 * corrupt both our mondo block and cpu list state.
797 *
798 * One consequence of this is that we cannot use timeout mechanisms
799 * that depend upon interrupts being delivered locally. So, for
800 * example, we cannot sample jiffies and expect it to advance.
801 *
802 * Fortunately, udelay() uses %stick/%tick so we can use that.
803 */
804 local_irq_save(flags);
805
806 this_cpu = smp_processor_id();
807 tb = &trap_block[this_cpu];
808
809 mondo = __va(tb->cpu_mondo_block_pa);
810 mondo[0] = data0;
811 mondo[1] = data1;
812 mondo[2] = data2;
813 wmb();
814
815 cpu_list = __va(tb->cpu_list_pa);
816
817 /* Setup the initial cpu list. */
818 cnt = 0;
819 for_each_cpu(i, mask) {
820 if (i == this_cpu || !cpu_online(cpu: i))
821 continue;
822 cpu_list[cnt++] = i;
823 }
824
825 if (cnt)
826 xcall_deliver_impl(tb, cnt);
827
828 local_irq_restore(flags);
829}
830
831/* Send cross call to all processors mentioned in MASK_P
832 * except self. Really, there are only two cases currently,
833 * "cpu_online_mask" and "mm_cpumask(mm)".
834 */
835static void smp_cross_call_masked(unsigned long *func, u32 ctx, u64 data1, u64 data2, const cpumask_t *mask)
836{
837 u64 data0 = (((u64)ctx)<<32 | (((u64)func) & 0xffffffff));
838
839 xcall_deliver(data0, data1, data2, mask);
840}
841
842/* Send cross call to all processors except self. */
843static void smp_cross_call(unsigned long *func, u32 ctx, u64 data1, u64 data2)
844{
845 smp_cross_call_masked(func, ctx, data1, data2, cpu_online_mask);
846}
847
848extern unsigned long xcall_sync_tick;
849
850static void smp_start_sync_tick_client(int cpu)
851{
852 xcall_deliver(data0: (u64) &xcall_sync_tick, data1: 0, data2: 0,
853 cpumask_of(cpu));
854}
855
856extern unsigned long xcall_call_function;
857
858void arch_send_call_function_ipi_mask(const struct cpumask *mask)
859{
860 xcall_deliver(data0: (u64) &xcall_call_function, data1: 0, data2: 0, mask);
861}
862
863extern unsigned long xcall_call_function_single;
864
865void arch_send_call_function_single_ipi(int cpu)
866{
867 xcall_deliver(data0: (u64) &xcall_call_function_single, data1: 0, data2: 0,
868 cpumask_of(cpu));
869}
870
871void __irq_entry smp_call_function_client(int irq, struct pt_regs *regs)
872{
873 clear_softint(1 << irq);
874 irq_enter();
875 generic_smp_call_function_interrupt();
876 irq_exit();
877}
878
879void __irq_entry smp_call_function_single_client(int irq, struct pt_regs *regs)
880{
881 clear_softint(1 << irq);
882 irq_enter();
883 generic_smp_call_function_single_interrupt();
884 irq_exit();
885}
886
887static void tsb_sync(void *info)
888{
889 struct trap_per_cpu *tp = &trap_block[raw_smp_processor_id()];
890 struct mm_struct *mm = info;
891
892 /* It is not valid to test "current->active_mm == mm" here.
893 *
894 * The value of "current" is not changed atomically with
895 * switch_mm(). But that's OK, we just need to check the
896 * current cpu's trap block PGD physical address.
897 */
898 if (tp->pgd_paddr == __pa(mm->pgd))
899 tsb_context_switch(mm);
900}
901
902void smp_tsb_sync(struct mm_struct *mm)
903{
904 smp_call_function_many(mask: mm_cpumask(mm), func: tsb_sync, info: mm, wait: 1);
905}
906
907extern unsigned long xcall_flush_tlb_mm;
908extern unsigned long xcall_flush_tlb_page;
909extern unsigned long xcall_flush_tlb_kernel_range;
910extern unsigned long xcall_fetch_glob_regs;
911extern unsigned long xcall_fetch_glob_pmu;
912extern unsigned long xcall_fetch_glob_pmu_n4;
913extern unsigned long xcall_receive_signal;
914extern unsigned long xcall_new_mmu_context_version;
915#ifdef CONFIG_KGDB
916extern unsigned long xcall_kgdb_capture;
917#endif
918
919#ifdef DCACHE_ALIASING_POSSIBLE
920extern unsigned long xcall_flush_dcache_page_cheetah;
921#endif
922extern unsigned long xcall_flush_dcache_page_spitfire;
923
924static inline void __local_flush_dcache_folio(struct folio *folio)
925{
926 unsigned int i, nr = folio_nr_pages(folio);
927
928#ifdef DCACHE_ALIASING_POSSIBLE
929 for (i = 0; i < nr; i++)
930 __flush_dcache_page(folio_address(folio) + i * PAGE_SIZE,
931 ((tlb_type == spitfire) &&
932 folio_flush_mapping(folio) != NULL));
933#else
934 if (folio_flush_mapping(folio) != NULL &&
935 tlb_type == spitfire) {
936 unsigned long pfn = folio_pfn(folio)
937 for (i = 0; i < nr; i++)
938 __flush_icache_page((pfn + i) * PAGE_SIZE);
939 }
940#endif
941}
942
943void smp_flush_dcache_folio_impl(struct folio *folio, int cpu)
944{
945 int this_cpu;
946
947 if (tlb_type == hypervisor)
948 return;
949
950#ifdef CONFIG_DEBUG_DCFLUSH
951 atomic_inc(&dcpage_flushes);
952#endif
953
954 this_cpu = get_cpu();
955
956 if (cpu == this_cpu) {
957 __local_flush_dcache_folio(folio);
958 } else if (cpu_online(cpu)) {
959 void *pg_addr = folio_address(folio);
960 u64 data0 = 0;
961
962 if (tlb_type == spitfire) {
963 data0 = ((u64)&xcall_flush_dcache_page_spitfire);
964 if (folio_flush_mapping(folio) != NULL)
965 data0 |= ((u64)1 << 32);
966 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
967#ifdef DCACHE_ALIASING_POSSIBLE
968 data0 = ((u64)&xcall_flush_dcache_page_cheetah);
969#endif
970 }
971 if (data0) {
972 unsigned int i, nr = folio_nr_pages(folio);
973
974 for (i = 0; i < nr; i++) {
975 xcall_deliver(data0, __pa(pg_addr),
976 data2: (u64) pg_addr, cpumask_of(cpu));
977#ifdef CONFIG_DEBUG_DCFLUSH
978 atomic_inc(&dcpage_flushes_xcall);
979#endif
980 pg_addr += PAGE_SIZE;
981 }
982 }
983 }
984
985 put_cpu();
986}
987
988void flush_dcache_folio_all(struct mm_struct *mm, struct folio *folio)
989{
990 void *pg_addr;
991 u64 data0;
992
993 if (tlb_type == hypervisor)
994 return;
995
996 preempt_disable();
997
998#ifdef CONFIG_DEBUG_DCFLUSH
999 atomic_inc(&dcpage_flushes);
1000#endif
1001 data0 = 0;
1002 pg_addr = folio_address(folio);
1003 if (tlb_type == spitfire) {
1004 data0 = ((u64)&xcall_flush_dcache_page_spitfire);
1005 if (folio_flush_mapping(folio) != NULL)
1006 data0 |= ((u64)1 << 32);
1007 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
1008#ifdef DCACHE_ALIASING_POSSIBLE
1009 data0 = ((u64)&xcall_flush_dcache_page_cheetah);
1010#endif
1011 }
1012 if (data0) {
1013 unsigned int i, nr = folio_nr_pages(folio);
1014
1015 for (i = 0; i < nr; i++) {
1016 xcall_deliver(data0, __pa(pg_addr),
1017 data2: (u64) pg_addr, cpu_online_mask);
1018#ifdef CONFIG_DEBUG_DCFLUSH
1019 atomic_inc(&dcpage_flushes_xcall);
1020#endif
1021 pg_addr += PAGE_SIZE;
1022 }
1023 }
1024 __local_flush_dcache_folio(folio);
1025
1026 preempt_enable();
1027}
1028
1029#ifdef CONFIG_KGDB
1030void kgdb_roundup_cpus(void)
1031{
1032 smp_cross_call(func: &xcall_kgdb_capture, ctx: 0, data1: 0, data2: 0);
1033}
1034#endif
1035
1036void smp_fetch_global_regs(void)
1037{
1038 smp_cross_call(func: &xcall_fetch_glob_regs, ctx: 0, data1: 0, data2: 0);
1039}
1040
1041void smp_fetch_global_pmu(void)
1042{
1043 if (tlb_type == hypervisor &&
1044 sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
1045 smp_cross_call(func: &xcall_fetch_glob_pmu_n4, ctx: 0, data1: 0, data2: 0);
1046 else
1047 smp_cross_call(func: &xcall_fetch_glob_pmu, ctx: 0, data1: 0, data2: 0);
1048}
1049
1050/* We know that the window frames of the user have been flushed
1051 * to the stack before we get here because all callers of us
1052 * are flush_tlb_*() routines, and these run after flush_cache_*()
1053 * which performs the flushw.
1054 *
1055 * mm->cpu_vm_mask is a bit mask of which cpus an address
1056 * space has (potentially) executed on, this is the heuristic
1057 * we use to limit cross calls.
1058 */
1059
1060/* This currently is only used by the hugetlb arch pre-fault
1061 * hook on UltraSPARC-III+ and later when changing the pagesize
1062 * bits of the context register for an address space.
1063 */
1064void smp_flush_tlb_mm(struct mm_struct *mm)
1065{
1066 u32 ctx = CTX_HWBITS(mm->context);
1067
1068 get_cpu();
1069
1070 smp_cross_call_masked(func: &xcall_flush_tlb_mm,
1071 ctx, data1: 0, data2: 0,
1072 mask: mm_cpumask(mm));
1073
1074 __flush_tlb_mm(ctx, SECONDARY_CONTEXT);
1075
1076 put_cpu();
1077}
1078
1079struct tlb_pending_info {
1080 unsigned long ctx;
1081 unsigned long nr;
1082 unsigned long *vaddrs;
1083};
1084
1085static void tlb_pending_func(void *info)
1086{
1087 struct tlb_pending_info *t = info;
1088
1089 __flush_tlb_pending(t->ctx, t->nr, t->vaddrs);
1090}
1091
1092void smp_flush_tlb_pending(struct mm_struct *mm, unsigned long nr, unsigned long *vaddrs)
1093{
1094 u32 ctx = CTX_HWBITS(mm->context);
1095 struct tlb_pending_info info;
1096
1097 get_cpu();
1098
1099 info.ctx = ctx;
1100 info.nr = nr;
1101 info.vaddrs = vaddrs;
1102
1103 smp_call_function_many(mask: mm_cpumask(mm), func: tlb_pending_func,
1104 info: &info, wait: 1);
1105
1106 __flush_tlb_pending(ctx, nr, vaddrs);
1107
1108 put_cpu();
1109}
1110
1111void smp_flush_tlb_page(struct mm_struct *mm, unsigned long vaddr)
1112{
1113 unsigned long context = CTX_HWBITS(mm->context);
1114
1115 get_cpu();
1116
1117 smp_cross_call_masked(func: &xcall_flush_tlb_page,
1118 ctx: context, data1: vaddr, data2: 0,
1119 mask: mm_cpumask(mm));
1120
1121 __flush_tlb_page(context, vaddr);
1122
1123 put_cpu();
1124}
1125
1126void smp_flush_tlb_kernel_range(unsigned long start, unsigned long end)
1127{
1128 start &= PAGE_MASK;
1129 end = PAGE_ALIGN(end);
1130 if (start != end) {
1131 smp_cross_call(func: &xcall_flush_tlb_kernel_range,
1132 ctx: 0, data1: start, data2: end);
1133
1134 __flush_tlb_kernel_range(start, end);
1135 }
1136}
1137
1138/* CPU capture. */
1139/* #define CAPTURE_DEBUG */
1140extern unsigned long xcall_capture;
1141
1142static atomic_t smp_capture_depth = ATOMIC_INIT(0);
1143static atomic_t smp_capture_registry = ATOMIC_INIT(0);
1144static unsigned long penguins_are_doing_time;
1145
1146void smp_capture(void)
1147{
1148 int result = atomic_add_return(i: 1, v: &smp_capture_depth);
1149
1150 if (result == 1) {
1151 int ncpus = num_online_cpus();
1152
1153#ifdef CAPTURE_DEBUG
1154 printk("CPU[%d]: Sending penguins to jail...",
1155 smp_processor_id());
1156#endif
1157 penguins_are_doing_time = 1;
1158 atomic_inc(v: &smp_capture_registry);
1159 smp_cross_call(func: &xcall_capture, ctx: 0, data1: 0, data2: 0);
1160 while (atomic_read(v: &smp_capture_registry) != ncpus)
1161 rmb();
1162#ifdef CAPTURE_DEBUG
1163 printk("done\n");
1164#endif
1165 }
1166}
1167
1168void smp_release(void)
1169{
1170 if (atomic_dec_and_test(v: &smp_capture_depth)) {
1171#ifdef CAPTURE_DEBUG
1172 printk("CPU[%d]: Giving pardon to "
1173 "imprisoned penguins\n",
1174 smp_processor_id());
1175#endif
1176 penguins_are_doing_time = 0;
1177 membar_safe("#StoreLoad");
1178 atomic_dec(v: &smp_capture_registry);
1179 }
1180}
1181
1182/* Imprisoned penguins run with %pil == PIL_NORMAL_MAX, but PSTATE_IE
1183 * set, so they can service tlb flush xcalls...
1184 */
1185extern void prom_world(int);
1186
1187void __irq_entry smp_penguin_jailcell(int irq, struct pt_regs *regs)
1188{
1189 clear_softint(1 << irq);
1190
1191 preempt_disable();
1192
1193 __asm__ __volatile__("flushw");
1194 prom_world(1);
1195 atomic_inc(&smp_capture_registry);
1196 membar_safe("#StoreLoad");
1197 while (penguins_are_doing_time)
1198 rmb();
1199 atomic_dec(&smp_capture_registry);
1200 prom_world(0);
1201
1202 preempt_enable();
1203}
1204
1205void __init smp_prepare_cpus(unsigned int max_cpus)
1206{
1207}
1208
1209void __init smp_setup_processor_id(void)
1210{
1211 if (tlb_type == spitfire)
1212 xcall_deliver_impl = spitfire_xcall_deliver;
1213 else if (tlb_type == cheetah || tlb_type == cheetah_plus)
1214 xcall_deliver_impl = cheetah_xcall_deliver;
1215 else
1216 xcall_deliver_impl = hypervisor_xcall_deliver;
1217}
1218
1219void __init smp_fill_in_cpu_possible_map(void)
1220{
1221 int possible_cpus = num_possible_cpus();
1222 int i;
1223
1224 if (possible_cpus > nr_cpu_ids)
1225 possible_cpus = nr_cpu_ids;
1226
1227 for (i = 0; i < possible_cpus; i++)
1228 set_cpu_possible(cpu: i, possible: true);
1229 for (; i < NR_CPUS; i++)
1230 set_cpu_possible(cpu: i, possible: false);
1231}
1232
1233void smp_fill_in_sib_core_maps(void)
1234{
1235 unsigned int i;
1236
1237 for_each_present_cpu(i) {
1238 unsigned int j;
1239
1240 cpumask_clear(dstp: &cpu_core_map[i]);
1241 if (cpu_data(i).core_id == 0) {
1242 cpumask_set_cpu(cpu: i, dstp: &cpu_core_map[i]);
1243 continue;
1244 }
1245
1246 for_each_present_cpu(j) {
1247 if (cpu_data(i).core_id ==
1248 cpu_data(j).core_id)
1249 cpumask_set_cpu(cpu: j, dstp: &cpu_core_map[i]);
1250 }
1251 }
1252
1253 for_each_present_cpu(i) {
1254 unsigned int j;
1255
1256 for_each_present_cpu(j) {
1257 if (cpu_data(i).max_cache_id ==
1258 cpu_data(j).max_cache_id)
1259 cpumask_set_cpu(cpu: j, dstp: &cpu_core_sib_cache_map[i]);
1260
1261 if (cpu_data(i).sock_id == cpu_data(j).sock_id)
1262 cpumask_set_cpu(cpu: j, dstp: &cpu_core_sib_map[i]);
1263 }
1264 }
1265
1266 for_each_present_cpu(i) {
1267 unsigned int j;
1268
1269 cpumask_clear(dstp: &per_cpu(cpu_sibling_map, i));
1270 if (cpu_data(i).proc_id == -1) {
1271 cpumask_set_cpu(cpu: i, dstp: &per_cpu(cpu_sibling_map, i));
1272 continue;
1273 }
1274
1275 for_each_present_cpu(j) {
1276 if (cpu_data(i).proc_id ==
1277 cpu_data(j).proc_id)
1278 cpumask_set_cpu(cpu: j, dstp: &per_cpu(cpu_sibling_map, i));
1279 }
1280 }
1281}
1282
1283int __cpu_up(unsigned int cpu, struct task_struct *tidle)
1284{
1285 int ret = smp_boot_one_cpu(cpu, idle: tidle);
1286
1287 if (!ret) {
1288 cpumask_set_cpu(cpu, dstp: &smp_commenced_mask);
1289 while (!cpu_online(cpu))
1290 mb();
1291 if (!cpu_online(cpu)) {
1292 ret = -ENODEV;
1293 } else {
1294 /* On SUN4V, writes to %tick and %stick are
1295 * not allowed.
1296 */
1297 if (tlb_type != hypervisor)
1298 smp_synchronize_one_tick(cpu);
1299 }
1300 }
1301 return ret;
1302}
1303
1304#ifdef CONFIG_HOTPLUG_CPU
1305void cpu_play_dead(void)
1306{
1307 int cpu = smp_processor_id();
1308 unsigned long pstate;
1309
1310 idle_task_exit();
1311
1312 if (tlb_type == hypervisor) {
1313 struct trap_per_cpu *tb = &trap_block[cpu];
1314
1315 sun4v_cpu_qconf(HV_CPU_QUEUE_CPU_MONDO,
1316 tb->cpu_mondo_pa, 0);
1317 sun4v_cpu_qconf(HV_CPU_QUEUE_DEVICE_MONDO,
1318 tb->dev_mondo_pa, 0);
1319 sun4v_cpu_qconf(HV_CPU_QUEUE_RES_ERROR,
1320 tb->resum_mondo_pa, 0);
1321 sun4v_cpu_qconf(HV_CPU_QUEUE_NONRES_ERROR,
1322 tb->nonresum_mondo_pa, 0);
1323 }
1324
1325 cpumask_clear_cpu(cpu, dstp: &smp_commenced_mask);
1326 membar_safe("#Sync");
1327
1328 local_irq_disable();
1329
1330 __asm__ __volatile__(
1331 "rdpr %%pstate, %0\n\t"
1332 "wrpr %0, %1, %%pstate"
1333 : "=r" (pstate)
1334 : "i" (PSTATE_IE));
1335
1336 while (1)
1337 barrier();
1338}
1339
1340int __cpu_disable(void)
1341{
1342 int cpu = smp_processor_id();
1343 cpuinfo_sparc *c;
1344 int i;
1345
1346 for_each_cpu(i, &cpu_core_map[cpu])
1347 cpumask_clear_cpu(cpu, dstp: &cpu_core_map[i]);
1348 cpumask_clear(dstp: &cpu_core_map[cpu]);
1349
1350 for_each_cpu(i, &per_cpu(cpu_sibling_map, cpu))
1351 cpumask_clear_cpu(cpu, dstp: &per_cpu(cpu_sibling_map, i));
1352 cpumask_clear(dstp: &per_cpu(cpu_sibling_map, cpu));
1353
1354 c = &cpu_data(cpu);
1355
1356 c->core_id = 0;
1357 c->proc_id = -1;
1358
1359 smp_wmb();
1360
1361 /* Make sure no interrupts point to this cpu. */
1362 fixup_irqs();
1363
1364 local_irq_enable();
1365 mdelay(1);
1366 local_irq_disable();
1367
1368 set_cpu_online(cpu, online: false);
1369
1370 cpu_map_rebuild();
1371
1372 return 0;
1373}
1374
1375void __cpu_die(unsigned int cpu)
1376{
1377 int i;
1378
1379 for (i = 0; i < 100; i++) {
1380 smp_rmb();
1381 if (!cpumask_test_cpu(cpu, cpumask: &smp_commenced_mask))
1382 break;
1383 msleep(msecs: 100);
1384 }
1385 if (cpumask_test_cpu(cpu, cpumask: &smp_commenced_mask)) {
1386 printk(KERN_ERR "CPU %u didn't die...\n", cpu);
1387 } else {
1388#if defined(CONFIG_SUN_LDOMS)
1389 unsigned long hv_err;
1390 int limit = 100;
1391
1392 do {
1393 hv_err = sun4v_cpu_stop(cpu);
1394 if (hv_err == HV_EOK) {
1395 set_cpu_present(cpu, false);
1396 break;
1397 }
1398 } while (--limit > 0);
1399 if (limit <= 0) {
1400 printk(KERN_ERR "sun4v_cpu_stop() fails err=%lu\n",
1401 hv_err);
1402 }
1403#endif
1404 }
1405}
1406#endif
1407
1408void __init smp_cpus_done(unsigned int max_cpus)
1409{
1410}
1411
1412static void send_cpu_ipi(int cpu)
1413{
1414 xcall_deliver(data0: (u64) &xcall_receive_signal,
1415 data1: 0, data2: 0, cpumask_of(cpu));
1416}
1417
1418void scheduler_poke(void)
1419{
1420 if (!cpu_poke)
1421 return;
1422
1423 if (!__this_cpu_read(poke))
1424 return;
1425
1426 __this_cpu_write(poke, false);
1427 set_softint(1 << PIL_SMP_RECEIVE_SIGNAL);
1428}
1429
1430static unsigned long send_cpu_poke(int cpu)
1431{
1432 unsigned long hv_err;
1433
1434 per_cpu(poke, cpu) = true;
1435 hv_err = sun4v_cpu_poke(cpu);
1436 if (hv_err != HV_EOK) {
1437 per_cpu(poke, cpu) = false;
1438 pr_err_ratelimited("%s: sun4v_cpu_poke() fails err=%lu\n",
1439 __func__, hv_err);
1440 }
1441
1442 return hv_err;
1443}
1444
1445void arch_smp_send_reschedule(int cpu)
1446{
1447 if (cpu == smp_processor_id()) {
1448 WARN_ON_ONCE(preemptible());
1449 set_softint(1 << PIL_SMP_RECEIVE_SIGNAL);
1450 return;
1451 }
1452
1453 /* Use cpu poke to resume idle cpu if supported. */
1454 if (cpu_poke && idle_cpu(cpu)) {
1455 unsigned long ret;
1456
1457 ret = send_cpu_poke(cpu);
1458 if (ret == HV_EOK)
1459 return;
1460 }
1461
1462 /* Use IPI in following cases:
1463 * - cpu poke not supported
1464 * - cpu not idle
1465 * - send_cpu_poke() returns with error
1466 */
1467 send_cpu_ipi(cpu);
1468}
1469
1470void smp_init_cpu_poke(void)
1471{
1472 unsigned long major;
1473 unsigned long minor;
1474 int ret;
1475
1476 if (tlb_type != hypervisor)
1477 return;
1478
1479 ret = sun4v_hvapi_get(HV_GRP_CORE, &major, &minor);
1480 if (ret) {
1481 pr_debug("HV_GRP_CORE is not registered\n");
1482 return;
1483 }
1484
1485 if (major == 1 && minor >= 6) {
1486 /* CPU POKE is registered. */
1487 cpu_poke = true;
1488 return;
1489 }
1490
1491 pr_debug("CPU_POKE not supported\n");
1492}
1493
1494void __irq_entry smp_receive_signal_client(int irq, struct pt_regs *regs)
1495{
1496 clear_softint(1 << irq);
1497 scheduler_ipi();
1498}
1499
1500static void stop_this_cpu(void *dummy)
1501{
1502 set_cpu_online(smp_processor_id(), online: false);
1503 prom_stopself();
1504}
1505
1506void smp_send_stop(void)
1507{
1508 int cpu;
1509
1510 if (tlb_type == hypervisor) {
1511 int this_cpu = smp_processor_id();
1512#ifdef CONFIG_SERIAL_SUNHV
1513 sunhv_migrate_hvcons_irq(this_cpu);
1514#endif
1515 for_each_online_cpu(cpu) {
1516 if (cpu == this_cpu)
1517 continue;
1518
1519 set_cpu_online(cpu, online: false);
1520#ifdef CONFIG_SUN_LDOMS
1521 if (ldom_domaining_enabled) {
1522 unsigned long hv_err;
1523 hv_err = sun4v_cpu_stop(cpu);
1524 if (hv_err)
1525 printk(KERN_ERR "sun4v_cpu_stop() "
1526 "failed err=%lu\n", hv_err);
1527 } else
1528#endif
1529 prom_stopcpu_cpuid(cpu);
1530 }
1531 } else
1532 smp_call_function(func: stop_this_cpu, NULL, wait: 0);
1533}
1534
1535static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
1536{
1537 if (cpu_to_node(cpu: from) == cpu_to_node(cpu: to))
1538 return LOCAL_DISTANCE;
1539 else
1540 return REMOTE_DISTANCE;
1541}
1542
1543static int __init pcpu_cpu_to_node(int cpu)
1544{
1545 return cpu_to_node(cpu);
1546}
1547
1548void __init setup_per_cpu_areas(void)
1549{
1550 unsigned long delta;
1551 unsigned int cpu;
1552 int rc = -EINVAL;
1553
1554 if (pcpu_chosen_fc != PCPU_FC_PAGE) {
1555 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
1556 PERCPU_DYNAMIC_RESERVE, atom_size: 4 << 20,
1557 cpu_distance_fn: pcpu_cpu_distance,
1558 cpu_to_nd_fn: pcpu_cpu_to_node);
1559 if (rc)
1560 pr_warn("PERCPU: %s allocator failed (%d), "
1561 "falling back to page size\n",
1562 pcpu_fc_names[pcpu_chosen_fc], rc);
1563 }
1564 if (rc < 0)
1565 rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE,
1566 cpu_to_nd_fn: pcpu_cpu_to_node);
1567 if (rc < 0)
1568 panic(fmt: "cannot initialize percpu area (err=%d)", rc);
1569
1570 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
1571 for_each_possible_cpu(cpu)
1572 __per_cpu_offset(cpu) = delta + pcpu_unit_offsets[cpu];
1573
1574 /* Setup %g5 for the boot cpu. */
1575 __local_per_cpu_offset = __per_cpu_offset(smp_processor_id());
1576
1577 of_fill_in_cpu_data();
1578 if (tlb_type == hypervisor)
1579 mdesc_fill_in_cpu_data(cpu_all_mask);
1580}
1581

source code of linux/arch/sparc/kernel/smp_64.c