blob: d0e935cf2093af382509ef440fd990ed85d4132f [file] [log] [blame]
Thomas Gleixner457c8992019-05-19 13:08:55 +01001// SPDX-License-Identifier: GPL-2.0-only
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * SMP boot-related support
4 *
David Mosberger-Tang829751152005-04-25 11:44:02 -07005 * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * David Mosberger-Tang <davidm@hpl.hp.com>
Suresh Siddhae927ecb2005-04-25 13:25:06 -07007 * Copyright (C) 2001, 2004-2005 Intel Corp
8 * Rohit Seth <rohit.seth@intel.com>
9 * Suresh Siddha <suresh.b.siddha@intel.com>
10 * Gordon Jin <gordon.jin@intel.com>
11 * Ashok Raj <ashok.raj@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 *
13 * 01/05/16 Rohit Seth <rohit.seth@intel.com> Moved SMP booting functions from smp.c to here.
14 * 01/04/27 David Mosberger <davidm@hpl.hp.com> Added ITC synching code.
15 * 02/07/31 David Mosberger <davidm@hpl.hp.com> Switch over to hotplug-CPU boot-sequence.
16 * smp_boot_cpus()/smp_commence() is replaced by
17 * smp_prepare_cpus()/__cpu_up()/smp_cpus_done().
Ashok Rajb8d8b882005-04-22 14:44:40 -070018 * 04/06/21 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support
Suresh Siddhae927ecb2005-04-25 13:25:06 -070019 * 04/12/26 Jin Gordon <gordon.jin@intel.com>
20 * 04/12/26 Rohit Seth <rohit.seth@intel.com>
21 * Add multi-threading and multi-core detection
22 * 05/01/30 Suresh Siddha <suresh.b.siddha@intel.com>
23 * Setup cpu_sibling_map and cpu_core_map
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#include <linux/module.h>
27#include <linux/acpi.h>
Mike Rapoport57c8a662018-10-30 15:09:49 -070028#include <linux/memblock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/cpu.h>
30#include <linux/delay.h>
31#include <linux/init.h>
32#include <linux/interrupt.h>
33#include <linux/irq.h>
34#include <linux/kernel.h>
35#include <linux/kernel_stat.h>
36#include <linux/mm.h>
37#include <linux/notifier.h>
38#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/spinlock.h>
40#include <linux/efi.h>
41#include <linux/percpu.h>
42#include <linux/bitops.h>
43
Arun Sharma600634972011-07-26 16:09:06 -070044#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <asm/cache.h>
46#include <asm/current.h>
47#include <asm/delay.h>
Ard Biesheuvel8ff059b2021-01-18 13:38:42 +010048#include <asm/efi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <asm/io.h>
50#include <asm/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <asm/mca.h>
52#include <asm/page.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <asm/processor.h>
54#include <asm/ptrace.h>
55#include <asm/sal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <asm/tlbflush.h>
57#include <asm/unistd.h>
58
59#define SMP_DEBUG 0
60
61#if SMP_DEBUG
62#define Dprintk(x...) printk(x)
63#else
64#define Dprintk(x...)
65#endif
66
Ashok Rajb8d8b882005-04-22 14:44:40 -070067#ifdef CONFIG_HOTPLUG_CPU
Ashok Rajff741902005-11-11 14:32:40 -080068#ifdef CONFIG_PERMIT_BSP_REMOVE
69#define bsp_remove_ok 1
70#else
71#define bsp_remove_ok 0
72#endif
73
Ashok Rajb8d8b882005-04-22 14:44:40 -070074/*
Ashok Rajb8d8b882005-04-22 14:44:40 -070075 * Global array allocated for NR_CPUS at boot time
76 */
77struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS];
78
79/*
80 * start_ap in head.S uses this to store current booting cpu
81 * info.
82 */
83struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0];
84
85#define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]);
86
Ashok Rajb8d8b882005-04-22 14:44:40 -070087#else
Ashok Rajb8d8b882005-04-22 14:44:40 -070088#define set_brendez_area(x)
89#endif
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92/*
93 * ITC synchronization related stuff:
94 */
Ashok Rajff741902005-11-11 14:32:40 -080095#define MASTER (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096#define SLAVE (SMP_CACHE_BYTES/8)
97
98#define NUM_ROUNDS 64 /* magic value */
99#define NUM_ITERS 5 /* likewise */
100
101static DEFINE_SPINLOCK(itc_sync_lock);
102static volatile unsigned long go[SLAVE + 1];
103
104#define DEBUG_ITC_SYNC 0
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106extern void start_ap (void);
107extern unsigned long ia64_iobase;
108
Ingo Molnar36c8b582006-07-03 00:25:41 -0700109struct task_struct *task_for_booting_cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111/*
112 * State for each CPU
113 */
114DEFINE_PER_CPU(int, cpu_state);
115
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700116cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
Robin Holt42aca482008-07-28 20:36:50 -0500117EXPORT_SYMBOL(cpu_core_map);
Mike Travisd5a74302007-10-16 01:24:05 -0700118DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
119EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
120
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700121int smp_num_siblings = 1;
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123/* which logical CPU number maps to which CPU (physical APIC ID) */
124volatile int ia64_cpu_to_sapicid[NR_CPUS];
125EXPORT_SYMBOL(ia64_cpu_to_sapicid);
126
Rusty Russell5eda7862015-06-01 15:53:53 +0930127static cpumask_t cpu_callin_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129struct smp_boot_data smp_boot_data __initdata;
130
131unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */
132
133char __initdata no_int_routing;
134
135unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */
136
Ashok Rajff741902005-11-11 14:32:40 -0800137#ifdef CONFIG_FORCE_CPEI_RETARGET
138#define CPEI_OVERRIDE_DEFAULT (1)
139#else
140#define CPEI_OVERRIDE_DEFAULT (0)
141#endif
142
143unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT;
144
145static int __init
146cmdl_force_cpei(char *str)
147{
148 int value=0;
149
150 get_option (&str, &value);
151 force_cpei_retarget = value;
152
153 return 1;
154}
155
156__setup("force_cpei=", cmdl_force_cpei);
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158static int __init
159nointroute (char *str)
160{
161 no_int_routing = 1;
162 printk ("no_int_routing on\n");
163 return 1;
164}
165
166__setup("nointroute", nointroute);
167
Ashok Rajff741902005-11-11 14:32:40 -0800168static void fix_b0_for_bsp(void)
169{
170#ifdef CONFIG_HOTPLUG_CPU
171 int cpuid;
172 static int fix_bsp_b0 = 1;
173
174 cpuid = smp_processor_id();
175
176 /*
177 * Cache the b0 value on the first AP that comes up
178 */
179 if (!(fix_bsp_b0 && cpuid))
180 return;
181
182 sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0];
183 printk ("Fixed BSP b0 value from CPU %d\n", cpuid);
184
185 fix_bsp_b0 = 0;
186#endif
187}
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189void
190sync_master (void *arg)
191{
192 unsigned long flags, i;
193
194 go[MASTER] = 0;
195
196 local_irq_save(flags);
197 {
198 for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) {
David Mosberger-Tang829751152005-04-25 11:44:02 -0700199 while (!go[MASTER])
200 cpu_relax();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 go[MASTER] = 0;
202 go[SLAVE] = ia64_get_itc();
203 }
204 }
205 local_irq_restore(flags);
206}
207
208/*
209 * Return the number of cycles by which our itc differs from the itc on the master
210 * (time-keeper) CPU. A positive number indicates our itc is ahead of the master,
211 * negative that it is behind.
212 */
213static inline long
214get_delta (long *rt, long *master)
215{
216 unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0;
217 unsigned long tcenter, t0, t1, tm;
218 long i;
219
220 for (i = 0; i < NUM_ITERS; ++i) {
221 t0 = ia64_get_itc();
222 go[MASTER] = 1;
David Mosberger-Tang829751152005-04-25 11:44:02 -0700223 while (!(tm = go[SLAVE]))
224 cpu_relax();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 go[SLAVE] = 0;
226 t1 = ia64_get_itc();
227
228 if (t1 - t0 < best_t1 - best_t0)
229 best_t0 = t0, best_t1 = t1, best_tm = tm;
230 }
231
232 *rt = best_t1 - best_t0;
233 *master = best_tm - best_t0;
234
235 /* average best_t0 and best_t1 without overflow: */
236 tcenter = (best_t0/2 + best_t1/2);
237 if (best_t0 % 2 + best_t1 % 2 == 2)
238 ++tcenter;
239 return tcenter - best_tm;
240}
241
242/*
243 * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU
244 * (normally the time-keeper CPU). We use a closed loop to eliminate the possibility of
245 * unaccounted-for errors (such as getting a machine check in the middle of a calibration
246 * step). The basic idea is for the slave to ask the master what itc value it has and to
247 * read its own itc before and after the master responds. Each iteration gives us three
248 * timestamps:
249 *
250 * slave master
251 *
252 * t0 ---\
253 * ---\
254 * --->
255 * tm
256 * /---
257 * /---
258 * t1 <---
259 *
260 *
261 * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0
262 * and t1. If we achieve this, the clocks are synchronized provided the interconnect
263 * between the slave and the master is symmetric. Even if the interconnect were
264 * asymmetric, we would still know that the synchronization error is smaller than the
265 * roundtrip latency (t0 - t1).
266 *
267 * When the interconnect is quiet and symmetric, this lets us synchronize the itc to
268 * within one or two cycles. However, we can only *guarantee* that the synchronization is
269 * accurate to within a round-trip time, which is typically in the range of several
270 * hundred cycles (e.g., ~500 cycles). In practice, this means that the itc's are usually
271 * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better
272 * than half a micro second or so.
273 */
274void
275ia64_sync_itc (unsigned int master)
276{
277 long i, delta, adj, adjust_latency = 0, done = 0;
278 unsigned long flags, rt, master_time_stamp, bound;
279#if DEBUG_ITC_SYNC
280 struct {
281 long rt; /* roundtrip time */
282 long master; /* master's timestamp */
283 long diff; /* difference between midpoint and master's timestamp */
284 long lat; /* estimate of itc adjustment latency */
285 } t[NUM_ROUNDS];
286#endif
287
288 /*
289 * Make sure local timer ticks are disabled while we sync. If
290 * they were enabled, we'd have to worry about nasty issues
291 * like setting the ITC ahead of (or a long time before) the
292 * next scheduled tick.
293 */
294 BUG_ON((ia64_get_itv() & (1 << 16)) == 0);
295
296 go[MASTER] = 1;
297
Jens Axboe8691e5a2008-06-06 11:18:06 +0200298 if (smp_call_function_single(master, sync_master, NULL, 0) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master);
300 return;
301 }
302
David Mosberger-Tang829751152005-04-25 11:44:02 -0700303 while (go[MASTER])
304 cpu_relax(); /* wait for master to be ready */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306 spin_lock_irqsave(&itc_sync_lock, flags);
307 {
308 for (i = 0; i < NUM_ROUNDS; ++i) {
309 delta = get_delta(&rt, &master_time_stamp);
310 if (delta == 0) {
311 done = 1; /* let's lock on to this... */
312 bound = rt;
313 }
314
315 if (!done) {
316 if (i > 0) {
317 adjust_latency += -delta;
318 adj = -delta + adjust_latency/4;
319 } else
320 adj = -delta;
321
322 ia64_set_itc(ia64_get_itc() + adj);
323 }
324#if DEBUG_ITC_SYNC
325 t[i].rt = rt;
326 t[i].master = master_time_stamp;
327 t[i].diff = delta;
328 t[i].lat = adjust_latency/4;
329#endif
330 }
331 }
332 spin_unlock_irqrestore(&itc_sync_lock, flags);
333
334#if DEBUG_ITC_SYNC
335 for (i = 0; i < NUM_ROUNDS; ++i)
336 printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n",
337 t[i].rt, t[i].master, t[i].diff, t[i].lat);
338#endif
339
340 printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, "
341 "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt);
342}
343
344/*
345 * Ideally sets up per-cpu profiling hooks. Doesn't do much now...
346 */
Greg Kroah-Hartman5b5e76e2012-12-21 14:05:13 -0800347static inline void smp_setup_percpu_timer(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348{
349}
350
Paul Gortmakerccce9bb2013-06-17 15:51:20 -0400351static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352smp_callin (void)
353{
Ashok Rajff741902005-11-11 14:32:40 -0800354 int cpuid, phys_id, itc_master;
Jack Steineread6caa2007-03-27 14:30:19 -0500355 struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 extern void ia64_init_itm(void);
Ashok Rajff741902005-11-11 14:32:40 -0800357 extern volatile int time_keeper_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 cpuid = smp_processor_id();
360 phys_id = hard_smp_processor_id();
Ashok Rajff741902005-11-11 14:32:40 -0800361 itc_master = time_keeper_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
363 if (cpu_online(cpuid)) {
364 printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n",
365 phys_id, cpuid);
366 BUG();
367 }
368
Ashok Rajff741902005-11-11 14:32:40 -0800369 fix_b0_for_bsp();
370
Lee Schermerhorn3bccd992010-05-26 14:44:59 -0700371 /*
372 * numa_node_id() works after this.
373 */
374 set_numa_node(cpu_to_node_map[cpuid]);
Lee Schermerhornfd1197f2010-05-26 14:45:01 -0700375 set_numa_mem(local_memory_node(cpu_to_node_map[cpuid]));
Lee Schermerhorn3bccd992010-05-26 14:44:59 -0700376
Yasuaki Ishimatsue1b30a32007-07-17 21:22:23 +0900377 spin_lock(&vector_lock);
378 /* Setup the per cpu irq handling data structures */
379 __setup_vector_irq(cpuid);
Manfred Spraule545a612008-09-07 16:57:22 +0200380 notify_cpu_starting(cpuid);
Srivatsa S. Bhat7d7f9842012-03-28 14:42:46 -0700381 set_cpu_online(cpuid, true);
Shaohua Lia9fa06c22005-06-25 14:55:05 -0700382 per_cpu(cpu_state, cpuid) = CPU_ONLINE;
Yasuaki Ishimatsue1b30a32007-07-17 21:22:23 +0900383 spin_unlock(&vector_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385 smp_setup_percpu_timer();
386
387 ia64_mca_cmc_vector_setup(); /* Setup vector on AP */
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 local_irq_enable();
390
391 if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) {
392 /*
393 * Synchronize the ITC with the BP. Need to do this after irqs are
394 * enabled because ia64_sync_itc() calls smp_call_function_single(), which
395 * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls
396 * local_bh_enable(), which bugs out if irqs are not enabled...
397 */
Ashok Rajff741902005-11-11 14:32:40 -0800398 Dprintk("Going to syncup ITC with ITC Master.\n");
399 ia64_sync_itc(itc_master);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401
402 /*
403 * Get our bogomips.
404 */
405 ia64_init_itm();
Jack Steineread6caa2007-03-27 14:30:19 -0500406
407 /*
408 * Delay calibration can be skipped if new processor is identical to the
409 * previous processor.
410 */
411 last_cpuinfo = cpu_data(cpuid - 1);
412 this_cpuinfo = local_cpu_data;
413 if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq ||
414 last_cpuinfo->proc_freq != this_cpuinfo->proc_freq ||
415 last_cpuinfo->features != this_cpuinfo->features ||
416 last_cpuinfo->revision != this_cpuinfo->revision ||
417 last_cpuinfo->family != this_cpuinfo->family ||
418 last_cpuinfo->archrev != this_cpuinfo->archrev ||
419 last_cpuinfo->model != this_cpuinfo->model)
420 calibrate_delay();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 local_cpu_data->loops_per_jiffy = loops_per_jiffy;
422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 /*
424 * Allow the master to continue.
425 */
Rusty Russell5d2068d2015-03-05 10:49:16 +1030426 cpumask_set_cpu(cpuid, &cpu_callin_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid);
428}
429
430
431/*
432 * Activate a secondary processor. head.S calls this.
433 */
Paul Gortmakerccce9bb2013-06-17 15:51:20 -0400434int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435start_secondary (void *unused)
436{
437 /* Early console may use I/O ports */
438 ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase));
Tony Luck10617bb2008-08-12 10:34:20 -0700439#ifndef CONFIG_PRINTK_TIME
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id());
Tony Luck10617bb2008-08-12 10:34:20 -0700441#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 efi_map_pal_code();
443 cpu_init();
444 smp_callin();
445
Thomas Gleixnerfc6d73d2016-02-26 18:43:40 +0000446 cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 return 0;
448}
449
Paul Gortmakerccce9bb2013-06-17 15:51:20 -0400450static int
Thomas Gleixner13583bf2012-04-20 13:05:49 +0000451do_boot_cpu (int sapicid, int cpu, struct task_struct *idle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452{
453 int timeout;
Ashok Rajb8d8b882005-04-22 14:44:40 -0700454
Thomas Gleixner13583bf2012-04-20 13:05:49 +0000455 task_for_booting_cpu = idle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid);
457
Ashok Rajb8d8b882005-04-22 14:44:40 -0700458 set_brendez_area(cpu);
Christoph Hellwig05933aa2019-08-13 09:25:02 +0200459 ia64_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461 /*
462 * Wait 10s total for the AP to start
463 */
464 Dprintk("Waiting on callin_map ...");
465 for (timeout = 0; timeout < 100000; timeout++) {
Rusty Russell5d2068d2015-03-05 10:49:16 +1030466 if (cpumask_test_cpu(cpu, &cpu_callin_map))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 break; /* It has booted */
Rusty Russell5eda7862015-06-01 15:53:53 +0930468 barrier(); /* Make sure we re-read cpu_callin_map */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 udelay(100);
470 }
471 Dprintk("\n");
472
Rusty Russell5d2068d2015-03-05 10:49:16 +1030473 if (!cpumask_test_cpu(cpu, &cpu_callin_map)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid);
475 ia64_cpu_to_sapicid[cpu] = -1;
Srivatsa S. Bhat7d7f9842012-03-28 14:42:46 -0700476 set_cpu_online(cpu, false); /* was set in smp_callin() */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 return -EINVAL;
478 }
479 return 0;
480}
481
482static int __init
483decay (char *str)
484{
485 int ticks;
486 get_option (&str, &ticks);
487 return 1;
488}
489
490__setup("decay=", decay);
491
492/*
493 * Initialize the logical CPU number to SAPICID mapping
494 */
495void __init
496smp_build_cpu_map (void)
497{
498 int sapicid, cpu, i;
499 int boot_cpu_id = hard_smp_processor_id();
500
501 for (cpu = 0; cpu < NR_CPUS; cpu++) {
502 ia64_cpu_to_sapicid[cpu] = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 }
504
505 ia64_cpu_to_sapicid[0] = boot_cpu_id;
Srivatsa S. Bhat7d7f9842012-03-28 14:42:46 -0700506 init_cpu_present(cpumask_of(0));
Rusty Russell2af51a32009-03-16 14:12:43 +1030507 set_cpu_possible(0, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) {
509 sapicid = smp_boot_data.cpu_phys_id[i];
510 if (sapicid == boot_cpu_id)
511 continue;
Rusty Russell2af51a32009-03-16 14:12:43 +1030512 set_cpu_present(cpu, true);
513 set_cpu_possible(cpu, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 ia64_cpu_to_sapicid[cpu] = sapicid;
515 cpu++;
516 }
517}
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519/*
520 * Cycle through the APs sending Wakeup IPIs to boot each.
521 */
522void __init
523smp_prepare_cpus (unsigned int max_cpus)
524{
525 int boot_cpu_id = hard_smp_processor_id();
526
527 /*
528 * Initialize the per-CPU profiling counter/multiplier
529 */
530
531 smp_setup_percpu_timer();
532
Rusty Russell5d2068d2015-03-05 10:49:16 +1030533 cpumask_set_cpu(0, &cpu_callin_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 local_cpu_data->loops_per_jiffy = loops_per_jiffy;
536 ia64_cpu_to_sapicid[0] = boot_cpu_id;
537
538 printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id);
539
540 current_thread_info()->cpu = 0;
541
542 /*
543 * If SMP should be disabled, then really disable it!
544 */
545 if (!max_cpus) {
546 printk(KERN_INFO "SMP mode deactivated.\n");
Rusty Russell2af51a32009-03-16 14:12:43 +1030547 init_cpu_online(cpumask_of(0));
548 init_cpu_present(cpumask_of(0));
549 init_cpu_possible(cpumask_of(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 return;
551 }
552}
553
Greg Kroah-Hartman5b5e76e2012-12-21 14:05:13 -0800554void smp_prepare_boot_cpu(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555{
Srivatsa S. Bhat7d7f9842012-03-28 14:42:46 -0700556 set_cpu_online(smp_processor_id(), true);
Rusty Russell5d2068d2015-03-05 10:49:16 +1030557 cpumask_set_cpu(smp_processor_id(), &cpu_callin_map);
Lee Schermerhorn3bccd992010-05-26 14:44:59 -0700558 set_numa_node(cpu_to_node_map[smp_processor_id()]);
Shaohua Lia9fa06c22005-06-25 14:55:05 -0700559 per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
561
562#ifdef CONFIG_HOTPLUG_CPU
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700563static inline void
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700564clear_cpu_sibling_map(int cpu)
565{
566 int i;
567
Rusty Russell5d2068d2015-03-05 10:49:16 +1030568 for_each_cpu(i, &per_cpu(cpu_sibling_map, cpu))
569 cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, i));
570 for_each_cpu(i, &cpu_core_map[cpu])
571 cpumask_clear_cpu(cpu, &cpu_core_map[i]);
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700572
Mike Travisd5a74302007-10-16 01:24:05 -0700573 per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE;
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700574}
575
576static void
577remove_siblinginfo(int cpu)
578{
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700579 if (cpu_data(cpu)->threads_per_core == 1 &&
580 cpu_data(cpu)->cores_per_socket == 1) {
Rusty Russell5d2068d2015-03-05 10:49:16 +1030581 cpumask_clear_cpu(cpu, &cpu_core_map[cpu]);
582 cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, cpu));
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700583 return;
584 }
585
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700586 /* remove it from all sibling map's */
587 clear_cpu_sibling_map(cpu);
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700588}
589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590extern void fixup_irqs(void);
Ashok Rajff741902005-11-11 14:32:40 -0800591
592int migrate_platform_irqs(unsigned int cpu)
593{
594 int new_cpei_cpu;
Thomas Gleixner097e98b2011-03-25 19:00:33 +0100595 struct irq_data *data = NULL;
Rusty Russell0de26522008-12-13 21:20:26 +1030596 const struct cpumask *mask;
Ashok Rajff741902005-11-11 14:32:40 -0800597 int retval = 0;
598
599 /*
600 * dont permit CPEI target to removed.
601 */
602 if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) {
603 printk ("CPU (%d) is CPEI Target\n", cpu);
604 if (can_cpei_retarget()) {
605 /*
606 * Now re-target the CPEI to a different processor
607 */
Srivatsa S. Bhat7d7f9842012-03-28 14:42:46 -0700608 new_cpei_cpu = cpumask_any(cpu_online_mask);
Rusty Russell0de26522008-12-13 21:20:26 +1030609 mask = cpumask_of(new_cpei_cpu);
Ashok Rajff741902005-11-11 14:32:40 -0800610 set_cpei_target_cpu(new_cpei_cpu);
Thomas Gleixner097e98b2011-03-25 19:00:33 +0100611 data = irq_get_irq_data(ia64_cpe_irq);
Ashok Rajff741902005-11-11 14:32:40 -0800612 /*
Simon Arlott72fdbdc2007-05-11 14:55:43 -0700613 * Switch for now, immediately, we need to do fake intr
Ashok Rajff741902005-11-11 14:32:40 -0800614 * as other interrupts, but need to study CPEI behaviour with
615 * polling before making changes.
616 */
Thomas Gleixner097e98b2011-03-25 19:00:33 +0100617 if (data && data->chip) {
618 data->chip->irq_disable(data);
619 data->chip->irq_set_affinity(data, mask, false);
620 data->chip->irq_enable(data);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300621 printk ("Re-targeting CPEI to cpu %d\n", new_cpei_cpu);
Ashok Rajff741902005-11-11 14:32:40 -0800622 }
623 }
Thomas Gleixner097e98b2011-03-25 19:00:33 +0100624 if (!data) {
Ashok Rajff741902005-11-11 14:32:40 -0800625 printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu);
626 retval = -EBUSY;
627 }
628 }
629 return retval;
630}
631
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632/* must be called with cpucontrol mutex held */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633int __cpu_disable(void)
634{
635 int cpu = smp_processor_id();
636
637 /*
638 * dont permit boot processor for now
639 */
Ashok Rajff741902005-11-11 14:32:40 -0800640 if (cpu == 0 && !bsp_remove_ok) {
641 printk ("Your platform does not support removal of BSP\n");
642 return (-EBUSY);
643 }
644
Srivatsa S. Bhat7d7f9842012-03-28 14:42:46 -0700645 set_cpu_online(cpu, false);
Alex Chiang66db2e62009-02-09 11:16:16 -0700646
Ashok Rajff741902005-11-11 14:32:40 -0800647 if (migrate_platform_irqs(cpu)) {
Srivatsa S. Bhat7d7f9842012-03-28 14:42:46 -0700648 set_cpu_online(cpu, true);
Alex Chiangc0acdea2009-02-09 11:16:57 -0700649 return -EBUSY;
Ashok Rajff741902005-11-11 14:32:40 -0800650 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700652 remove_siblinginfo(cpu);
Alex Chiang66db2e62009-02-09 11:16:16 -0700653 fixup_irqs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 local_flush_tlb_all();
Rusty Russell5d2068d2015-03-05 10:49:16 +1030655 cpumask_clear_cpu(cpu, &cpu_callin_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 return 0;
657}
658
659void __cpu_die(unsigned int cpu)
660{
661 unsigned int i;
662
663 for (i = 0; i < 100; i++) {
664 /* They ack this in play_dead by setting CPU_DEAD */
665 if (per_cpu(cpu_state, cpu) == CPU_DEAD)
666 {
Ashok Rajb8d8b882005-04-22 14:44:40 -0700667 printk ("CPU %d is now offline\n", cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 return;
669 }
670 msleep(100);
671 }
672 printk(KERN_ERR "CPU %u didn't die...\n", cpu);
673}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674#endif /* CONFIG_HOTPLUG_CPU */
675
676void
677smp_cpus_done (unsigned int dummy)
678{
679 int cpu;
680 unsigned long bogosum = 0;
681
682 /*
683 * Allow the user to impress friends.
684 */
685
hawkes@sgi.comdc565b52005-10-10 08:43:26 -0700686 for_each_online_cpu(cpu) {
687 bogosum += cpu_data(cpu)->loops_per_jiffy;
688 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
690 printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
691 (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100);
692}
693
Greg Kroah-Hartman5b5e76e2012-12-21 14:05:13 -0800694static inline void set_cpu_sibling_map(int cpu)
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700695{
696 int i;
697
698 for_each_online_cpu(i) {
699 if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) {
Rusty Russell5d2068d2015-03-05 10:49:16 +1030700 cpumask_set_cpu(i, &cpu_core_map[cpu]);
701 cpumask_set_cpu(cpu, &cpu_core_map[i]);
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700702 if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) {
Rusty Russell5d2068d2015-03-05 10:49:16 +1030703 cpumask_set_cpu(i,
704 &per_cpu(cpu_sibling_map, cpu));
705 cpumask_set_cpu(cpu,
706 &per_cpu(cpu_sibling_map, i));
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700707 }
708 }
709 }
710}
711
Paul Gortmakerccce9bb2013-06-17 15:51:20 -0400712int
Thomas Gleixner8239c252012-04-20 13:05:42 +0000713__cpu_up(unsigned int cpu, struct task_struct *tidle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714{
715 int ret;
716 int sapicid;
717
718 sapicid = ia64_cpu_to_sapicid[cpu];
719 if (sapicid == -1)
720 return -EINVAL;
721
722 /*
Ashok Rajb8d8b882005-04-22 14:44:40 -0700723 * Already booted cpu? not valid anymore since we dont
724 * do idle loop tightspin anymore.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 */
Rusty Russell5d2068d2015-03-05 10:49:16 +1030726 if (cpumask_test_cpu(cpu, &cpu_callin_map))
Ashok Rajb8d8b882005-04-22 14:44:40 -0700727 return -EINVAL;
728
Shaohua Lia9fa06c22005-06-25 14:55:05 -0700729 per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 /* Processor goes to start_secondary(), sets online flag */
Thomas Gleixner13583bf2012-04-20 13:05:49 +0000731 ret = do_boot_cpu(sapicid, cpu, tidle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 if (ret < 0)
733 return ret;
734
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700735 if (cpu_data(cpu)->threads_per_core == 1 &&
736 cpu_data(cpu)->cores_per_socket == 1) {
Rusty Russell5d2068d2015-03-05 10:49:16 +1030737 cpumask_set_cpu(cpu, &per_cpu(cpu_sibling_map, cpu));
738 cpumask_set_cpu(cpu, &cpu_core_map[cpu]);
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700739 return 0;
740 }
741
742 set_cpu_sibling_map(cpu);
743
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 return 0;
745}
746
747/*
Simon Arlott72fdbdc2007-05-11 14:55:43 -0700748 * Assume that CPUs have been discovered by some platform-dependent interface. For
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 * SoftSDV/Lion, that would be ACPI.
750 *
751 * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP().
752 */
753void __init
754init_smp_config(void)
755{
756 struct fptr {
757 unsigned long fp;
758 unsigned long gp;
759 } *ap_startup;
760 long sal_ret;
761
Simon Arlott72fdbdc2007-05-11 14:55:43 -0700762 /* Tell SAL where to drop the APs. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 ap_startup = (struct fptr *) start_ap;
764 sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ,
765 ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0);
766 if (sal_ret < 0)
767 printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n",
768 ia64_sal_strerror(sal_ret));
769}
770
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700771/*
772 * identify_siblings(cpu) gets called from identify_cpu. This populates the
773 * information related to logical execution units in per_cpu_data structure.
774 */
Greg Kroah-Hartman5b5e76e2012-12-21 14:05:13 -0800775void identify_siblings(struct cpuinfo_ia64 *c)
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700776{
Matthew Wilcoxe088a4a2009-05-22 13:49:49 -0700777 long status;
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700778 u16 pltid;
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700779 pal_logical_to_physical_t info;
780
Alex Chiang6ff0bc92008-04-24 12:57:08 -0600781 status = ia64_pal_logical_to_phys(-1, &info);
782 if (status != PAL_STATUS_SUCCESS) {
Alex Chiang113134f2007-10-19 13:20:09 -0600783 if (status != PAL_STATUS_UNIMPLEMENTED) {
784 printk(KERN_ERR
785 "ia64_pal_logical_to_phys failed with %ld\n",
786 status);
787 return;
788 }
789
790 info.overview_ppid = 0;
791 info.overview_cpp = 1;
792 info.overview_tpc = 1;
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700793 }
Alex Chiang6ff0bc92008-04-24 12:57:08 -0600794
795 status = ia64_sal_physical_id_info(&pltid);
796 if (status != PAL_STATUS_SUCCESS) {
797 if (status != PAL_STATUS_UNIMPLEMENTED)
798 printk(KERN_ERR
799 "ia64_sal_pltid failed with %ld\n",
800 status);
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700801 return;
802 }
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700803
804 c->socket_id = (pltid << 8) | info.overview_ppid;
Alex Chiang113134f2007-10-19 13:20:09 -0600805
806 if (info.overview_cpp == 1 && info.overview_tpc == 1)
807 return;
808
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700809 c->cores_per_socket = info.overview_cpp;
810 c->threads_per_core = info.overview_tpc;
Fenghua Yu4129a952006-02-27 16:16:22 -0800811 c->num_log = info.overview_num_log;
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700812
Fenghua Yu4129a952006-02-27 16:16:22 -0800813 c->core_id = info.log1_cid;
814 c->thread_id = info.log1_tid;
Suresh Siddhae927ecb2005-04-25 13:25:06 -0700815}
Stephane Eraniandd562c02006-09-21 10:35:44 -0700816
817/*
818 * returns non zero, if multi-threading is enabled
819 * on at least one physical package. Due to hotplug cpu
820 * and (maxcpus=), all threads may not necessarily be enabled
821 * even though the processor supports multi-threading.
822 */
823int is_multithreading_enabled(void)
824{
825 int i, j;
826
827 for_each_present_cpu(i) {
828 for_each_present_cpu(j) {
829 if (j == i)
830 continue;
831 if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) {
832 if (cpu_data(j)->core_id == cpu_data(i)->core_id)
833 return 1;
834 }
835 }
836 }
837 return 0;
838}
839EXPORT_SYMBOL_GPL(is_multithreading_enabled);