Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * SMP boot-related support | |
3 | * | |
82975115 | 4 | * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co |
1da177e4 | 5 | * David Mosberger-Tang <davidm@hpl.hp.com> |
e927ecb0 SS |
6 | * Copyright (C) 2001, 2004-2005 Intel Corp |
7 | * Rohit Seth <rohit.seth@intel.com> | |
8 | * Suresh Siddha <suresh.b.siddha@intel.com> | |
9 | * Gordon Jin <gordon.jin@intel.com> | |
10 | * Ashok Raj <ashok.raj@intel.com> | |
1da177e4 LT |
11 | * |
12 | * 01/05/16 Rohit Seth <rohit.seth@intel.com> Moved SMP booting functions from smp.c to here. | |
13 | * 01/04/27 David Mosberger <davidm@hpl.hp.com> Added ITC synching code. | |
14 | * 02/07/31 David Mosberger <davidm@hpl.hp.com> Switch over to hotplug-CPU boot-sequence. | |
15 | * smp_boot_cpus()/smp_commence() is replaced by | |
16 | * smp_prepare_cpus()/__cpu_up()/smp_cpus_done(). | |
b8d8b883 | 17 | * 04/06/21 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support |
e927ecb0 SS |
18 | * 04/12/26 Jin Gordon <gordon.jin@intel.com> |
19 | * 04/12/26 Rohit Seth <rohit.seth@intel.com> | |
20 | * Add multi-threading and multi-core detection | |
21 | * 05/01/30 Suresh Siddha <suresh.b.siddha@intel.com> | |
22 | * Setup cpu_sibling_map and cpu_core_map | |
1da177e4 | 23 | */ |
1da177e4 LT |
24 | |
25 | #include <linux/module.h> | |
26 | #include <linux/acpi.h> | |
27 | #include <linux/bootmem.h> | |
28 | #include <linux/cpu.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/irq.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/kernel_stat.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/notifier.h> | |
37 | #include <linux/smp.h> | |
1da177e4 LT |
38 | #include <linux/spinlock.h> |
39 | #include <linux/efi.h> | |
40 | #include <linux/percpu.h> | |
41 | #include <linux/bitops.h> | |
42 | ||
43 | #include <asm/atomic.h> | |
44 | #include <asm/cache.h> | |
45 | #include <asm/current.h> | |
46 | #include <asm/delay.h> | |
47 | #include <asm/ia32.h> | |
48 | #include <asm/io.h> | |
49 | #include <asm/irq.h> | |
50 | #include <asm/machvec.h> | |
51 | #include <asm/mca.h> | |
52 | #include <asm/page.h> | |
e51835d5 | 53 | #include <asm/paravirt.h> |
1da177e4 LT |
54 | #include <asm/pgalloc.h> |
55 | #include <asm/pgtable.h> | |
56 | #include <asm/processor.h> | |
57 | #include <asm/ptrace.h> | |
58 | #include <asm/sal.h> | |
59 | #include <asm/system.h> | |
60 | #include <asm/tlbflush.h> | |
61 | #include <asm/unistd.h> | |
6e9de181 | 62 | #include <asm/sn/arch.h> |
1da177e4 LT |
63 | |
64 | #define SMP_DEBUG 0 | |
65 | ||
66 | #if SMP_DEBUG | |
67 | #define Dprintk(x...) printk(x) | |
68 | #else | |
69 | #define Dprintk(x...) | |
70 | #endif | |
71 | ||
b8d8b883 | 72 | #ifdef CONFIG_HOTPLUG_CPU |
ff741906 AR |
73 | #ifdef CONFIG_PERMIT_BSP_REMOVE |
74 | #define bsp_remove_ok 1 | |
75 | #else | |
76 | #define bsp_remove_ok 0 | |
77 | #endif | |
78 | ||
b8d8b883 AR |
79 | /* |
80 | * Store all idle threads, this can be reused instead of creating | |
81 | * a new thread. Also avoids complicated thread destroy functionality | |
82 | * for idle threads. | |
83 | */ | |
84 | struct task_struct *idle_thread_array[NR_CPUS]; | |
85 | ||
86 | /* | |
87 | * Global array allocated for NR_CPUS at boot time | |
88 | */ | |
89 | struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS]; | |
90 | ||
91 | /* | |
92 | * start_ap in head.S uses this to store current booting cpu | |
93 | * info. | |
94 | */ | |
95 | struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0]; | |
96 | ||
97 | #define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]); | |
98 | ||
99 | #define get_idle_for_cpu(x) (idle_thread_array[(x)]) | |
100 | #define set_idle_for_cpu(x,p) (idle_thread_array[(x)] = (p)) | |
101 | ||
102 | #else | |
103 | ||
104 | #define get_idle_for_cpu(x) (NULL) | |
105 | #define set_idle_for_cpu(x,p) | |
106 | #define set_brendez_area(x) | |
107 | #endif | |
108 | ||
1da177e4 LT |
109 | |
110 | /* | |
111 | * ITC synchronization related stuff: | |
112 | */ | |
ff741906 | 113 | #define MASTER (0) |
1da177e4 LT |
114 | #define SLAVE (SMP_CACHE_BYTES/8) |
115 | ||
116 | #define NUM_ROUNDS 64 /* magic value */ | |
117 | #define NUM_ITERS 5 /* likewise */ | |
118 | ||
119 | static DEFINE_SPINLOCK(itc_sync_lock); | |
120 | static volatile unsigned long go[SLAVE + 1]; | |
121 | ||
122 | #define DEBUG_ITC_SYNC 0 | |
123 | ||
1da177e4 LT |
124 | extern void start_ap (void); |
125 | extern unsigned long ia64_iobase; | |
126 | ||
36c8b586 | 127 | struct task_struct *task_for_booting_cpu; |
1da177e4 LT |
128 | |
129 | /* | |
130 | * State for each CPU | |
131 | */ | |
132 | DEFINE_PER_CPU(int, cpu_state); | |
133 | ||
134 | /* Bitmasks of currently online, and possible CPUs */ | |
135 | cpumask_t cpu_online_map; | |
136 | EXPORT_SYMBOL(cpu_online_map); | |
69aa234b | 137 | cpumask_t cpu_possible_map = CPU_MASK_NONE; |
1da177e4 LT |
138 | EXPORT_SYMBOL(cpu_possible_map); |
139 | ||
e927ecb0 | 140 | cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; |
42aca483 | 141 | EXPORT_SYMBOL(cpu_core_map); |
d5a7430d MT |
142 | DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); |
143 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); | |
144 | ||
e927ecb0 | 145 | int smp_num_siblings = 1; |
e927ecb0 | 146 | |
1da177e4 LT |
147 | /* which logical CPU number maps to which CPU (physical APIC ID) */ |
148 | volatile int ia64_cpu_to_sapicid[NR_CPUS]; | |
149 | EXPORT_SYMBOL(ia64_cpu_to_sapicid); | |
150 | ||
151 | static volatile cpumask_t cpu_callin_map; | |
152 | ||
153 | struct smp_boot_data smp_boot_data __initdata; | |
154 | ||
155 | unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */ | |
156 | ||
157 | char __initdata no_int_routing; | |
158 | ||
159 | unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */ | |
160 | ||
ff741906 AR |
161 | #ifdef CONFIG_FORCE_CPEI_RETARGET |
162 | #define CPEI_OVERRIDE_DEFAULT (1) | |
163 | #else | |
164 | #define CPEI_OVERRIDE_DEFAULT (0) | |
165 | #endif | |
166 | ||
167 | unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT; | |
168 | ||
169 | static int __init | |
170 | cmdl_force_cpei(char *str) | |
171 | { | |
172 | int value=0; | |
173 | ||
174 | get_option (&str, &value); | |
175 | force_cpei_retarget = value; | |
176 | ||
177 | return 1; | |
178 | } | |
179 | ||
180 | __setup("force_cpei=", cmdl_force_cpei); | |
181 | ||
1da177e4 LT |
182 | static int __init |
183 | nointroute (char *str) | |
184 | { | |
185 | no_int_routing = 1; | |
186 | printk ("no_int_routing on\n"); | |
187 | return 1; | |
188 | } | |
189 | ||
190 | __setup("nointroute", nointroute); | |
191 | ||
ff741906 AR |
192 | static void fix_b0_for_bsp(void) |
193 | { | |
194 | #ifdef CONFIG_HOTPLUG_CPU | |
195 | int cpuid; | |
196 | static int fix_bsp_b0 = 1; | |
197 | ||
198 | cpuid = smp_processor_id(); | |
199 | ||
200 | /* | |
201 | * Cache the b0 value on the first AP that comes up | |
202 | */ | |
203 | if (!(fix_bsp_b0 && cpuid)) | |
204 | return; | |
205 | ||
206 | sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0]; | |
207 | printk ("Fixed BSP b0 value from CPU %d\n", cpuid); | |
208 | ||
209 | fix_bsp_b0 = 0; | |
210 | #endif | |
211 | } | |
212 | ||
1da177e4 LT |
213 | void |
214 | sync_master (void *arg) | |
215 | { | |
216 | unsigned long flags, i; | |
217 | ||
218 | go[MASTER] = 0; | |
219 | ||
220 | local_irq_save(flags); | |
221 | { | |
222 | for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) { | |
82975115 DMT |
223 | while (!go[MASTER]) |
224 | cpu_relax(); | |
1da177e4 LT |
225 | go[MASTER] = 0; |
226 | go[SLAVE] = ia64_get_itc(); | |
227 | } | |
228 | } | |
229 | local_irq_restore(flags); | |
230 | } | |
231 | ||
232 | /* | |
233 | * Return the number of cycles by which our itc differs from the itc on the master | |
234 | * (time-keeper) CPU. A positive number indicates our itc is ahead of the master, | |
235 | * negative that it is behind. | |
236 | */ | |
237 | static inline long | |
238 | get_delta (long *rt, long *master) | |
239 | { | |
240 | unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; | |
241 | unsigned long tcenter, t0, t1, tm; | |
242 | long i; | |
243 | ||
244 | for (i = 0; i < NUM_ITERS; ++i) { | |
245 | t0 = ia64_get_itc(); | |
246 | go[MASTER] = 1; | |
82975115 DMT |
247 | while (!(tm = go[SLAVE])) |
248 | cpu_relax(); | |
1da177e4 LT |
249 | go[SLAVE] = 0; |
250 | t1 = ia64_get_itc(); | |
251 | ||
252 | if (t1 - t0 < best_t1 - best_t0) | |
253 | best_t0 = t0, best_t1 = t1, best_tm = tm; | |
254 | } | |
255 | ||
256 | *rt = best_t1 - best_t0; | |
257 | *master = best_tm - best_t0; | |
258 | ||
259 | /* average best_t0 and best_t1 without overflow: */ | |
260 | tcenter = (best_t0/2 + best_t1/2); | |
261 | if (best_t0 % 2 + best_t1 % 2 == 2) | |
262 | ++tcenter; | |
263 | return tcenter - best_tm; | |
264 | } | |
265 | ||
266 | /* | |
267 | * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU | |
268 | * (normally the time-keeper CPU). We use a closed loop to eliminate the possibility of | |
269 | * unaccounted-for errors (such as getting a machine check in the middle of a calibration | |
270 | * step). The basic idea is for the slave to ask the master what itc value it has and to | |
271 | * read its own itc before and after the master responds. Each iteration gives us three | |
272 | * timestamps: | |
273 | * | |
274 | * slave master | |
275 | * | |
276 | * t0 ---\ | |
277 | * ---\ | |
278 | * ---> | |
279 | * tm | |
280 | * /--- | |
281 | * /--- | |
282 | * t1 <--- | |
283 | * | |
284 | * | |
285 | * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0 | |
286 | * and t1. If we achieve this, the clocks are synchronized provided the interconnect | |
287 | * between the slave and the master is symmetric. Even if the interconnect were | |
288 | * asymmetric, we would still know that the synchronization error is smaller than the | |
289 | * roundtrip latency (t0 - t1). | |
290 | * | |
291 | * When the interconnect is quiet and symmetric, this lets us synchronize the itc to | |
292 | * within one or two cycles. However, we can only *guarantee* that the synchronization is | |
293 | * accurate to within a round-trip time, which is typically in the range of several | |
294 | * hundred cycles (e.g., ~500 cycles). In practice, this means that the itc's are usually | |
295 | * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better | |
296 | * than half a micro second or so. | |
297 | */ | |
298 | void | |
299 | ia64_sync_itc (unsigned int master) | |
300 | { | |
301 | long i, delta, adj, adjust_latency = 0, done = 0; | |
302 | unsigned long flags, rt, master_time_stamp, bound; | |
303 | #if DEBUG_ITC_SYNC | |
304 | struct { | |
305 | long rt; /* roundtrip time */ | |
306 | long master; /* master's timestamp */ | |
307 | long diff; /* difference between midpoint and master's timestamp */ | |
308 | long lat; /* estimate of itc adjustment latency */ | |
309 | } t[NUM_ROUNDS]; | |
310 | #endif | |
311 | ||
312 | /* | |
313 | * Make sure local timer ticks are disabled while we sync. If | |
314 | * they were enabled, we'd have to worry about nasty issues | |
315 | * like setting the ITC ahead of (or a long time before) the | |
316 | * next scheduled tick. | |
317 | */ | |
318 | BUG_ON((ia64_get_itv() & (1 << 16)) == 0); | |
319 | ||
320 | go[MASTER] = 1; | |
321 | ||
8691e5a8 | 322 | if (smp_call_function_single(master, sync_master, NULL, 0) < 0) { |
1da177e4 LT |
323 | printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master); |
324 | return; | |
325 | } | |
326 | ||
82975115 DMT |
327 | while (go[MASTER]) |
328 | cpu_relax(); /* wait for master to be ready */ | |
1da177e4 LT |
329 | |
330 | spin_lock_irqsave(&itc_sync_lock, flags); | |
331 | { | |
332 | for (i = 0; i < NUM_ROUNDS; ++i) { | |
333 | delta = get_delta(&rt, &master_time_stamp); | |
334 | if (delta == 0) { | |
335 | done = 1; /* let's lock on to this... */ | |
336 | bound = rt; | |
337 | } | |
338 | ||
339 | if (!done) { | |
340 | if (i > 0) { | |
341 | adjust_latency += -delta; | |
342 | adj = -delta + adjust_latency/4; | |
343 | } else | |
344 | adj = -delta; | |
345 | ||
346 | ia64_set_itc(ia64_get_itc() + adj); | |
347 | } | |
348 | #if DEBUG_ITC_SYNC | |
349 | t[i].rt = rt; | |
350 | t[i].master = master_time_stamp; | |
351 | t[i].diff = delta; | |
352 | t[i].lat = adjust_latency/4; | |
353 | #endif | |
354 | } | |
355 | } | |
356 | spin_unlock_irqrestore(&itc_sync_lock, flags); | |
357 | ||
358 | #if DEBUG_ITC_SYNC | |
359 | for (i = 0; i < NUM_ROUNDS; ++i) | |
360 | printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", | |
361 | t[i].rt, t[i].master, t[i].diff, t[i].lat); | |
362 | #endif | |
363 | ||
364 | printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, " | |
365 | "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt); | |
366 | } | |
367 | ||
368 | /* | |
369 | * Ideally sets up per-cpu profiling hooks. Doesn't do much now... | |
370 | */ | |
371 | static inline void __devinit | |
372 | smp_setup_percpu_timer (void) | |
373 | { | |
374 | } | |
375 | ||
d86ebd14 | 376 | static void __cpuinit |
1da177e4 LT |
377 | smp_callin (void) |
378 | { | |
ff741906 | 379 | int cpuid, phys_id, itc_master; |
ead6caae | 380 | struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo; |
1da177e4 | 381 | extern void ia64_init_itm(void); |
ff741906 | 382 | extern volatile int time_keeper_id; |
1da177e4 LT |
383 | |
384 | #ifdef CONFIG_PERFMON | |
385 | extern void pfm_init_percpu(void); | |
386 | #endif | |
387 | ||
388 | cpuid = smp_processor_id(); | |
389 | phys_id = hard_smp_processor_id(); | |
ff741906 | 390 | itc_master = time_keeper_id; |
1da177e4 LT |
391 | |
392 | if (cpu_online(cpuid)) { | |
393 | printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n", | |
394 | phys_id, cpuid); | |
395 | BUG(); | |
396 | } | |
397 | ||
ff741906 AR |
398 | fix_b0_for_bsp(); |
399 | ||
f27b433e | 400 | ipi_call_lock_irq(); |
e1b30a39 YI |
401 | spin_lock(&vector_lock); |
402 | /* Setup the per cpu irq handling data structures */ | |
403 | __setup_vector_irq(cpuid); | |
1da177e4 | 404 | cpu_set(cpuid, cpu_online_map); |
a9fa06c2 | 405 | per_cpu(cpu_state, cpuid) = CPU_ONLINE; |
e1b30a39 | 406 | spin_unlock(&vector_lock); |
f27b433e | 407 | ipi_call_unlock_irq(); |
1da177e4 LT |
408 | |
409 | smp_setup_percpu_timer(); | |
410 | ||
411 | ia64_mca_cmc_vector_setup(); /* Setup vector on AP */ | |
412 | ||
413 | #ifdef CONFIG_PERFMON | |
414 | pfm_init_percpu(); | |
415 | #endif | |
416 | ||
417 | local_irq_enable(); | |
418 | ||
419 | if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) { | |
420 | /* | |
421 | * Synchronize the ITC with the BP. Need to do this after irqs are | |
422 | * enabled because ia64_sync_itc() calls smp_call_function_single(), which | |
423 | * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls | |
424 | * local_bh_enable(), which bugs out if irqs are not enabled... | |
425 | */ | |
ff741906 AR |
426 | Dprintk("Going to syncup ITC with ITC Master.\n"); |
427 | ia64_sync_itc(itc_master); | |
1da177e4 LT |
428 | } |
429 | ||
430 | /* | |
431 | * Get our bogomips. | |
432 | */ | |
433 | ia64_init_itm(); | |
ead6caae JS |
434 | |
435 | /* | |
436 | * Delay calibration can be skipped if new processor is identical to the | |
437 | * previous processor. | |
438 | */ | |
439 | last_cpuinfo = cpu_data(cpuid - 1); | |
440 | this_cpuinfo = local_cpu_data; | |
441 | if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq || | |
442 | last_cpuinfo->proc_freq != this_cpuinfo->proc_freq || | |
443 | last_cpuinfo->features != this_cpuinfo->features || | |
444 | last_cpuinfo->revision != this_cpuinfo->revision || | |
445 | last_cpuinfo->family != this_cpuinfo->family || | |
446 | last_cpuinfo->archrev != this_cpuinfo->archrev || | |
447 | last_cpuinfo->model != this_cpuinfo->model) | |
448 | calibrate_delay(); | |
1da177e4 LT |
449 | local_cpu_data->loops_per_jiffy = loops_per_jiffy; |
450 | ||
451 | #ifdef CONFIG_IA32_SUPPORT | |
452 | ia32_gdt_init(); | |
453 | #endif | |
454 | ||
455 | /* | |
456 | * Allow the master to continue. | |
457 | */ | |
458 | cpu_set(cpuid, cpu_callin_map); | |
459 | Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid); | |
460 | } | |
461 | ||
462 | ||
463 | /* | |
464 | * Activate a secondary processor. head.S calls this. | |
465 | */ | |
d86ebd14 | 466 | int __cpuinit |
1da177e4 LT |
467 | start_secondary (void *unused) |
468 | { | |
469 | /* Early console may use I/O ports */ | |
470 | ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase)); | |
10617bbe | 471 | #ifndef CONFIG_PRINTK_TIME |
1da177e4 | 472 | Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id()); |
10617bbe | 473 | #endif |
1da177e4 LT |
474 | efi_map_pal_code(); |
475 | cpu_init(); | |
5bfb5d69 | 476 | preempt_disable(); |
1da177e4 LT |
477 | smp_callin(); |
478 | ||
479 | cpu_idle(); | |
480 | return 0; | |
481 | } | |
482 | ||
6b2fb3c6 | 483 | struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs) |
1da177e4 LT |
484 | { |
485 | return NULL; | |
486 | } | |
487 | ||
488 | struct create_idle { | |
6d5aefb8 | 489 | struct work_struct work; |
1da177e4 LT |
490 | struct task_struct *idle; |
491 | struct completion done; | |
492 | int cpu; | |
493 | }; | |
494 | ||
9d6f40b8 | 495 | void __cpuinit |
6d5aefb8 | 496 | do_fork_idle(struct work_struct *work) |
1da177e4 | 497 | { |
6d5aefb8 DH |
498 | struct create_idle *c_idle = |
499 | container_of(work, struct create_idle, work); | |
1da177e4 LT |
500 | |
501 | c_idle->idle = fork_idle(c_idle->cpu); | |
502 | complete(&c_idle->done); | |
503 | } | |
504 | ||
9d6f40b8 | 505 | static int __cpuinit |
1da177e4 LT |
506 | do_boot_cpu (int sapicid, int cpu) |
507 | { | |
508 | int timeout; | |
509 | struct create_idle c_idle = { | |
6d5aefb8 | 510 | .work = __WORK_INITIALIZER(c_idle.work, do_fork_idle), |
1da177e4 LT |
511 | .cpu = cpu, |
512 | .done = COMPLETION_INITIALIZER(c_idle.done), | |
513 | }; | |
b8d8b883 AR |
514 | |
515 | c_idle.idle = get_idle_for_cpu(cpu); | |
516 | if (c_idle.idle) { | |
517 | init_idle(c_idle.idle, cpu); | |
518 | goto do_rest; | |
519 | } | |
520 | ||
1da177e4 LT |
521 | /* |
522 | * We can't use kernel_thread since we must avoid to reschedule the child. | |
523 | */ | |
524 | if (!keventd_up() || current_is_keventd()) | |
6d5aefb8 | 525 | c_idle.work.func(&c_idle.work); |
1da177e4 | 526 | else { |
6d5aefb8 | 527 | schedule_work(&c_idle.work); |
1da177e4 LT |
528 | wait_for_completion(&c_idle.done); |
529 | } | |
530 | ||
531 | if (IS_ERR(c_idle.idle)) | |
532 | panic("failed fork for CPU %d", cpu); | |
b8d8b883 AR |
533 | |
534 | set_idle_for_cpu(cpu, c_idle.idle); | |
535 | ||
536 | do_rest: | |
1da177e4 LT |
537 | task_for_booting_cpu = c_idle.idle; |
538 | ||
539 | Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid); | |
540 | ||
b8d8b883 | 541 | set_brendez_area(cpu); |
1da177e4 LT |
542 | platform_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0); |
543 | ||
544 | /* | |
545 | * Wait 10s total for the AP to start | |
546 | */ | |
547 | Dprintk("Waiting on callin_map ..."); | |
548 | for (timeout = 0; timeout < 100000; timeout++) { | |
549 | if (cpu_isset(cpu, cpu_callin_map)) | |
550 | break; /* It has booted */ | |
551 | udelay(100); | |
552 | } | |
553 | Dprintk("\n"); | |
554 | ||
555 | if (!cpu_isset(cpu, cpu_callin_map)) { | |
556 | printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid); | |
557 | ia64_cpu_to_sapicid[cpu] = -1; | |
558 | cpu_clear(cpu, cpu_online_map); /* was set in smp_callin() */ | |
559 | return -EINVAL; | |
560 | } | |
561 | return 0; | |
562 | } | |
563 | ||
564 | static int __init | |
565 | decay (char *str) | |
566 | { | |
567 | int ticks; | |
568 | get_option (&str, &ticks); | |
569 | return 1; | |
570 | } | |
571 | ||
572 | __setup("decay=", decay); | |
573 | ||
574 | /* | |
575 | * Initialize the logical CPU number to SAPICID mapping | |
576 | */ | |
577 | void __init | |
578 | smp_build_cpu_map (void) | |
579 | { | |
580 | int sapicid, cpu, i; | |
581 | int boot_cpu_id = hard_smp_processor_id(); | |
582 | ||
583 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
584 | ia64_cpu_to_sapicid[cpu] = -1; | |
1da177e4 LT |
585 | } |
586 | ||
587 | ia64_cpu_to_sapicid[0] = boot_cpu_id; | |
588 | cpus_clear(cpu_present_map); | |
589 | cpu_set(0, cpu_present_map); | |
590 | cpu_set(0, cpu_possible_map); | |
591 | for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) { | |
592 | sapicid = smp_boot_data.cpu_phys_id[i]; | |
593 | if (sapicid == boot_cpu_id) | |
594 | continue; | |
595 | cpu_set(cpu, cpu_present_map); | |
596 | cpu_set(cpu, cpu_possible_map); | |
597 | ia64_cpu_to_sapicid[cpu] = sapicid; | |
598 | cpu++; | |
599 | } | |
600 | } | |
601 | ||
1da177e4 LT |
602 | /* |
603 | * Cycle through the APs sending Wakeup IPIs to boot each. | |
604 | */ | |
605 | void __init | |
606 | smp_prepare_cpus (unsigned int max_cpus) | |
607 | { | |
608 | int boot_cpu_id = hard_smp_processor_id(); | |
609 | ||
610 | /* | |
611 | * Initialize the per-CPU profiling counter/multiplier | |
612 | */ | |
613 | ||
614 | smp_setup_percpu_timer(); | |
615 | ||
616 | /* | |
617 | * We have the boot CPU online for sure. | |
618 | */ | |
619 | cpu_set(0, cpu_online_map); | |
620 | cpu_set(0, cpu_callin_map); | |
621 | ||
622 | local_cpu_data->loops_per_jiffy = loops_per_jiffy; | |
623 | ia64_cpu_to_sapicid[0] = boot_cpu_id; | |
624 | ||
625 | printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id); | |
626 | ||
627 | current_thread_info()->cpu = 0; | |
628 | ||
629 | /* | |
630 | * If SMP should be disabled, then really disable it! | |
631 | */ | |
632 | if (!max_cpus) { | |
633 | printk(KERN_INFO "SMP mode deactivated.\n"); | |
634 | cpus_clear(cpu_online_map); | |
635 | cpus_clear(cpu_present_map); | |
636 | cpus_clear(cpu_possible_map); | |
637 | cpu_set(0, cpu_online_map); | |
638 | cpu_set(0, cpu_present_map); | |
639 | cpu_set(0, cpu_possible_map); | |
640 | return; | |
641 | } | |
642 | } | |
643 | ||
644 | void __devinit smp_prepare_boot_cpu(void) | |
645 | { | |
646 | cpu_set(smp_processor_id(), cpu_online_map); | |
647 | cpu_set(smp_processor_id(), cpu_callin_map); | |
a9fa06c2 | 648 | per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; |
e51835d5 | 649 | paravirt_post_smp_prepare_boot_cpu(); |
1da177e4 LT |
650 | } |
651 | ||
652 | #ifdef CONFIG_HOTPLUG_CPU | |
e927ecb0 SS |
653 | static inline void |
654 | clear_cpu_sibling_map(int cpu) | |
655 | { | |
656 | int i; | |
657 | ||
d5a7430d MT |
658 | for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu)) |
659 | cpu_clear(cpu, per_cpu(cpu_sibling_map, i)); | |
e927ecb0 SS |
660 | for_each_cpu_mask(i, cpu_core_map[cpu]) |
661 | cpu_clear(cpu, cpu_core_map[i]); | |
662 | ||
d5a7430d | 663 | per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE; |
e927ecb0 SS |
664 | } |
665 | ||
666 | static void | |
667 | remove_siblinginfo(int cpu) | |
668 | { | |
669 | int last = 0; | |
670 | ||
671 | if (cpu_data(cpu)->threads_per_core == 1 && | |
672 | cpu_data(cpu)->cores_per_socket == 1) { | |
673 | cpu_clear(cpu, cpu_core_map[cpu]); | |
d5a7430d | 674 | cpu_clear(cpu, per_cpu(cpu_sibling_map, cpu)); |
e927ecb0 SS |
675 | return; |
676 | } | |
677 | ||
678 | last = (cpus_weight(cpu_core_map[cpu]) == 1 ? 1 : 0); | |
679 | ||
680 | /* remove it from all sibling map's */ | |
681 | clear_cpu_sibling_map(cpu); | |
e927ecb0 SS |
682 | } |
683 | ||
1da177e4 | 684 | extern void fixup_irqs(void); |
ff741906 AR |
685 | |
686 | int migrate_platform_irqs(unsigned int cpu) | |
687 | { | |
688 | int new_cpei_cpu; | |
689 | irq_desc_t *desc = NULL; | |
690 | cpumask_t mask; | |
691 | int retval = 0; | |
692 | ||
693 | /* | |
694 | * dont permit CPEI target to removed. | |
695 | */ | |
696 | if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) { | |
697 | printk ("CPU (%d) is CPEI Target\n", cpu); | |
698 | if (can_cpei_retarget()) { | |
699 | /* | |
700 | * Now re-target the CPEI to a different processor | |
701 | */ | |
702 | new_cpei_cpu = any_online_cpu(cpu_online_map); | |
703 | mask = cpumask_of_cpu(new_cpei_cpu); | |
704 | set_cpei_target_cpu(new_cpei_cpu); | |
a8553acd | 705 | desc = irq_desc + ia64_cpe_irq; |
ff741906 | 706 | /* |
72fdbdce | 707 | * Switch for now, immediately, we need to do fake intr |
ff741906 AR |
708 | * as other interrupts, but need to study CPEI behaviour with |
709 | * polling before making changes. | |
710 | */ | |
711 | if (desc) { | |
d1bef4ed IM |
712 | desc->chip->disable(ia64_cpe_irq); |
713 | desc->chip->set_affinity(ia64_cpe_irq, mask); | |
714 | desc->chip->enable(ia64_cpe_irq); | |
ff741906 AR |
715 | printk ("Re-targetting CPEI to cpu %d\n", new_cpei_cpu); |
716 | } | |
717 | } | |
718 | if (!desc) { | |
719 | printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu); | |
720 | retval = -EBUSY; | |
721 | } | |
722 | } | |
723 | return retval; | |
724 | } | |
725 | ||
1da177e4 | 726 | /* must be called with cpucontrol mutex held */ |
1da177e4 LT |
727 | int __cpu_disable(void) |
728 | { | |
729 | int cpu = smp_processor_id(); | |
730 | ||
731 | /* | |
732 | * dont permit boot processor for now | |
733 | */ | |
ff741906 AR |
734 | if (cpu == 0 && !bsp_remove_ok) { |
735 | printk ("Your platform does not support removal of BSP\n"); | |
736 | return (-EBUSY); | |
737 | } | |
738 | ||
6e9de181 JK |
739 | if (ia64_platform_is("sn2")) { |
740 | if (!sn_cpu_disable_allowed(cpu)) | |
741 | return -EBUSY; | |
742 | } | |
743 | ||
ff741906 AR |
744 | cpu_clear(cpu, cpu_online_map); |
745 | ||
746 | if (migrate_platform_irqs(cpu)) { | |
747 | cpu_set(cpu, cpu_online_map); | |
748 | return (-EBUSY); | |
749 | } | |
1da177e4 | 750 | |
e927ecb0 | 751 | remove_siblinginfo(cpu); |
f3705136 | 752 | cpu_clear(cpu, cpu_online_map); |
1da177e4 LT |
753 | fixup_irqs(); |
754 | local_flush_tlb_all(); | |
b8d8b883 | 755 | cpu_clear(cpu, cpu_callin_map); |
1da177e4 LT |
756 | return 0; |
757 | } | |
758 | ||
759 | void __cpu_die(unsigned int cpu) | |
760 | { | |
761 | unsigned int i; | |
762 | ||
763 | for (i = 0; i < 100; i++) { | |
764 | /* They ack this in play_dead by setting CPU_DEAD */ | |
765 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) | |
766 | { | |
b8d8b883 | 767 | printk ("CPU %d is now offline\n", cpu); |
1da177e4 LT |
768 | return; |
769 | } | |
770 | msleep(100); | |
771 | } | |
772 | printk(KERN_ERR "CPU %u didn't die...\n", cpu); | |
773 | } | |
1da177e4 LT |
774 | #endif /* CONFIG_HOTPLUG_CPU */ |
775 | ||
776 | void | |
777 | smp_cpus_done (unsigned int dummy) | |
778 | { | |
779 | int cpu; | |
780 | unsigned long bogosum = 0; | |
781 | ||
782 | /* | |
783 | * Allow the user to impress friends. | |
784 | */ | |
785 | ||
dc565b52 | 786 | for_each_online_cpu(cpu) { |
787 | bogosum += cpu_data(cpu)->loops_per_jiffy; | |
788 | } | |
1da177e4 LT |
789 | |
790 | printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", | |
791 | (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); | |
792 | } | |
793 | ||
e927ecb0 SS |
794 | static inline void __devinit |
795 | set_cpu_sibling_map(int cpu) | |
796 | { | |
797 | int i; | |
798 | ||
799 | for_each_online_cpu(i) { | |
800 | if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) { | |
801 | cpu_set(i, cpu_core_map[cpu]); | |
802 | cpu_set(cpu, cpu_core_map[i]); | |
803 | if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) { | |
d5a7430d MT |
804 | cpu_set(i, per_cpu(cpu_sibling_map, cpu)); |
805 | cpu_set(cpu, per_cpu(cpu_sibling_map, i)); | |
e927ecb0 SS |
806 | } |
807 | } | |
808 | } | |
809 | } | |
810 | ||
9d6f40b8 | 811 | int __cpuinit |
1da177e4 LT |
812 | __cpu_up (unsigned int cpu) |
813 | { | |
814 | int ret; | |
815 | int sapicid; | |
816 | ||
817 | sapicid = ia64_cpu_to_sapicid[cpu]; | |
818 | if (sapicid == -1) | |
819 | return -EINVAL; | |
820 | ||
821 | /* | |
b8d8b883 AR |
822 | * Already booted cpu? not valid anymore since we dont |
823 | * do idle loop tightspin anymore. | |
1da177e4 LT |
824 | */ |
825 | if (cpu_isset(cpu, cpu_callin_map)) | |
b8d8b883 AR |
826 | return -EINVAL; |
827 | ||
a9fa06c2 | 828 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
1da177e4 LT |
829 | /* Processor goes to start_secondary(), sets online flag */ |
830 | ret = do_boot_cpu(sapicid, cpu); | |
831 | if (ret < 0) | |
832 | return ret; | |
833 | ||
e927ecb0 SS |
834 | if (cpu_data(cpu)->threads_per_core == 1 && |
835 | cpu_data(cpu)->cores_per_socket == 1) { | |
d5a7430d | 836 | cpu_set(cpu, per_cpu(cpu_sibling_map, cpu)); |
e927ecb0 SS |
837 | cpu_set(cpu, cpu_core_map[cpu]); |
838 | return 0; | |
839 | } | |
840 | ||
841 | set_cpu_sibling_map(cpu); | |
842 | ||
1da177e4 LT |
843 | return 0; |
844 | } | |
845 | ||
846 | /* | |
72fdbdce | 847 | * Assume that CPUs have been discovered by some platform-dependent interface. For |
1da177e4 LT |
848 | * SoftSDV/Lion, that would be ACPI. |
849 | * | |
850 | * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP(). | |
851 | */ | |
852 | void __init | |
853 | init_smp_config(void) | |
854 | { | |
855 | struct fptr { | |
856 | unsigned long fp; | |
857 | unsigned long gp; | |
858 | } *ap_startup; | |
859 | long sal_ret; | |
860 | ||
72fdbdce | 861 | /* Tell SAL where to drop the APs. */ |
1da177e4 LT |
862 | ap_startup = (struct fptr *) start_ap; |
863 | sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ, | |
864 | ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0); | |
865 | if (sal_ret < 0) | |
866 | printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n", | |
867 | ia64_sal_strerror(sal_ret)); | |
868 | } | |
869 | ||
e927ecb0 SS |
870 | /* |
871 | * identify_siblings(cpu) gets called from identify_cpu. This populates the | |
872 | * information related to logical execution units in per_cpu_data structure. | |
873 | */ | |
874 | void __devinit | |
875 | identify_siblings(struct cpuinfo_ia64 *c) | |
876 | { | |
877 | s64 status; | |
878 | u16 pltid; | |
e927ecb0 SS |
879 | pal_logical_to_physical_t info; |
880 | ||
6ff0bc94 AC |
881 | status = ia64_pal_logical_to_phys(-1, &info); |
882 | if (status != PAL_STATUS_SUCCESS) { | |
113134fc AC |
883 | if (status != PAL_STATUS_UNIMPLEMENTED) { |
884 | printk(KERN_ERR | |
885 | "ia64_pal_logical_to_phys failed with %ld\n", | |
886 | status); | |
887 | return; | |
888 | } | |
889 | ||
890 | info.overview_ppid = 0; | |
891 | info.overview_cpp = 1; | |
892 | info.overview_tpc = 1; | |
e927ecb0 | 893 | } |
6ff0bc94 AC |
894 | |
895 | status = ia64_sal_physical_id_info(&pltid); | |
896 | if (status != PAL_STATUS_SUCCESS) { | |
897 | if (status != PAL_STATUS_UNIMPLEMENTED) | |
898 | printk(KERN_ERR | |
899 | "ia64_sal_pltid failed with %ld\n", | |
900 | status); | |
e927ecb0 SS |
901 | return; |
902 | } | |
e927ecb0 SS |
903 | |
904 | c->socket_id = (pltid << 8) | info.overview_ppid; | |
113134fc AC |
905 | |
906 | if (info.overview_cpp == 1 && info.overview_tpc == 1) | |
907 | return; | |
908 | ||
e927ecb0 SS |
909 | c->cores_per_socket = info.overview_cpp; |
910 | c->threads_per_core = info.overview_tpc; | |
4129a953 | 911 | c->num_log = info.overview_num_log; |
e927ecb0 | 912 | |
4129a953 FY |
913 | c->core_id = info.log1_cid; |
914 | c->thread_id = info.log1_tid; | |
e927ecb0 | 915 | } |
dd562c05 SE |
916 | |
917 | /* | |
918 | * returns non zero, if multi-threading is enabled | |
919 | * on at least one physical package. Due to hotplug cpu | |
920 | * and (maxcpus=), all threads may not necessarily be enabled | |
921 | * even though the processor supports multi-threading. | |
922 | */ | |
923 | int is_multithreading_enabled(void) | |
924 | { | |
925 | int i, j; | |
926 | ||
927 | for_each_present_cpu(i) { | |
928 | for_each_present_cpu(j) { | |
929 | if (j == i) | |
930 | continue; | |
931 | if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) { | |
932 | if (cpu_data(j)->core_id == cpu_data(i)->core_id) | |
933 | return 1; | |
934 | } | |
935 | } | |
936 | } | |
937 | return 0; | |
938 | } | |
939 | EXPORT_SYMBOL_GPL(is_multithreading_enabled); |