1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * SMP boot-related support 4 * 5 * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co 6 * David Mosberger-Tang <davidm@hpl.hp.com> 7 * 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> 12 * 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(). 18 * 04/06/21 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support 19 * 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 24 */ 25 26 #include <linux/module.h> 27 #include <linux/acpi.h> 28 #include <linux/memblock.h> 29 #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> 39 #include <linux/spinlock.h> 40 #include <linux/efi.h> 41 #include <linux/percpu.h> 42 #include <linux/bitops.h> 43 44 #include <linux/atomic.h> 45 #include <asm/cache.h> 46 #include <asm/current.h> 47 #include <asm/delay.h> 48 #include <asm/efi.h> 49 #include <asm/io.h> 50 #include <asm/irq.h> 51 #include <asm/mca.h> 52 #include <asm/page.h> 53 #include <asm/processor.h> 54 #include <asm/ptrace.h> 55 #include <asm/sal.h> 56 #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 67 #ifdef CONFIG_HOTPLUG_CPU 68 #ifdef CONFIG_PERMIT_BSP_REMOVE 69 #define bsp_remove_ok 1 70 #else 71 #define bsp_remove_ok 0 72 #endif 73 74 /* 75 * Global array allocated for NR_CPUS at boot time 76 */ 77 struct 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 */ 83 struct 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 87 #else 88 #define set_brendez_area(x) 89 #endif 90 91 92 /* 93 * ITC synchronization related stuff: 94 */ 95 #define MASTER (0) 96 #define SLAVE (SMP_CACHE_BYTES/8) 97 98 #define NUM_ROUNDS 64 /* magic value */ 99 #define NUM_ITERS 5 /* likewise */ 100 101 static DEFINE_SPINLOCK(itc_sync_lock); 102 static volatile unsigned long go[SLAVE + 1]; 103 104 #define DEBUG_ITC_SYNC 0 105 106 extern void start_ap (void); 107 extern unsigned long ia64_iobase; 108 109 struct task_struct *task_for_booting_cpu; 110 111 /* 112 * State for each CPU 113 */ 114 DEFINE_PER_CPU(int, cpu_state); 115 116 cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; 117 EXPORT_SYMBOL(cpu_core_map); 118 DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); 119 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); 120 121 int smp_num_siblings = 1; 122 123 /* which logical CPU number maps to which CPU (physical APIC ID) */ 124 volatile int ia64_cpu_to_sapicid[NR_CPUS]; 125 EXPORT_SYMBOL(ia64_cpu_to_sapicid); 126 127 static cpumask_t cpu_callin_map; 128 129 struct smp_boot_data smp_boot_data __initdata; 130 131 unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */ 132 133 char __initdata no_int_routing; 134 135 unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */ 136 137 #ifdef CONFIG_FORCE_CPEI_RETARGET 138 #define CPEI_OVERRIDE_DEFAULT (1) 139 #else 140 #define CPEI_OVERRIDE_DEFAULT (0) 141 #endif 142 143 unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT; 144 145 static int __init 146 cmdl_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); 157 158 static int __init 159 nointroute (char *str) 160 { 161 no_int_routing = 1; 162 printk ("no_int_routing on\n"); 163 return 1; 164 } 165 166 __setup("nointroute", nointroute); 167 168 static 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 } 188 189 void 190 sync_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) { 199 while (!go[MASTER]) 200 cpu_relax(); 201 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 */ 213 static inline long 214 get_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; 223 while (!(tm = go[SLAVE])) 224 cpu_relax(); 225 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 */ 274 void 275 ia64_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; 297 298 if (smp_call_function_single(master, sync_master, NULL, 0) < 0) { 299 printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master); 300 return; 301 } 302 303 while (go[MASTER]) 304 cpu_relax(); /* wait for master to be ready */ 305 306 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 */ 347 static inline void smp_setup_percpu_timer(void) 348 { 349 } 350 351 static void 352 smp_callin (void) 353 { 354 int cpuid, phys_id, itc_master; 355 struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo; 356 extern void ia64_init_itm(void); 357 extern volatile int time_keeper_id; 358 359 cpuid = smp_processor_id(); 360 phys_id = hard_smp_processor_id(); 361 itc_master = time_keeper_id; 362 363 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 } 368 369 fix_b0_for_bsp(); 370 371 /* 372 * numa_node_id() works after this. 373 */ 374 set_numa_node(cpu_to_node_map[cpuid]); 375 set_numa_mem(local_memory_node(cpu_to_node_map[cpuid])); 376 377 spin_lock(&vector_lock); 378 /* Setup the per cpu irq handling data structures */ 379 __setup_vector_irq(cpuid); 380 notify_cpu_starting(cpuid); 381 set_cpu_online(cpuid, true); 382 per_cpu(cpu_state, cpuid) = CPU_ONLINE; 383 spin_unlock(&vector_lock); 384 385 smp_setup_percpu_timer(); 386 387 ia64_mca_cmc_vector_setup(); /* Setup vector on AP */ 388 389 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 */ 398 Dprintk("Going to syncup ITC with ITC Master.\n"); 399 ia64_sync_itc(itc_master); 400 } 401 402 /* 403 * Get our bogomips. 404 */ 405 ia64_init_itm(); 406 407 /* 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(); 421 local_cpu_data->loops_per_jiffy = loops_per_jiffy; 422 423 /* 424 * Allow the master to continue. 425 */ 426 cpumask_set_cpu(cpuid, &cpu_callin_map); 427 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 */ 434 int 435 start_secondary (void *unused) 436 { 437 /* Early console may use I/O ports */ 438 ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase)); 439 #ifndef CONFIG_PRINTK_TIME 440 Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id()); 441 #endif 442 efi_map_pal_code(); 443 cpu_init(); 444 preempt_disable(); 445 smp_callin(); 446 447 cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); 448 return 0; 449 } 450 451 static int 452 do_boot_cpu (int sapicid, int cpu, struct task_struct *idle) 453 { 454 int timeout; 455 456 task_for_booting_cpu = idle; 457 Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid); 458 459 set_brendez_area(cpu); 460 ia64_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0); 461 462 /* 463 * Wait 10s total for the AP to start 464 */ 465 Dprintk("Waiting on callin_map ..."); 466 for (timeout = 0; timeout < 100000; timeout++) { 467 if (cpumask_test_cpu(cpu, &cpu_callin_map)) 468 break; /* It has booted */ 469 barrier(); /* Make sure we re-read cpu_callin_map */ 470 udelay(100); 471 } 472 Dprintk("\n"); 473 474 if (!cpumask_test_cpu(cpu, &cpu_callin_map)) { 475 printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid); 476 ia64_cpu_to_sapicid[cpu] = -1; 477 set_cpu_online(cpu, false); /* was set in smp_callin() */ 478 return -EINVAL; 479 } 480 return 0; 481 } 482 483 static int __init 484 decay (char *str) 485 { 486 int ticks; 487 get_option (&str, &ticks); 488 return 1; 489 } 490 491 __setup("decay=", decay); 492 493 /* 494 * Initialize the logical CPU number to SAPICID mapping 495 */ 496 void __init 497 smp_build_cpu_map (void) 498 { 499 int sapicid, cpu, i; 500 int boot_cpu_id = hard_smp_processor_id(); 501 502 for (cpu = 0; cpu < NR_CPUS; cpu++) { 503 ia64_cpu_to_sapicid[cpu] = -1; 504 } 505 506 ia64_cpu_to_sapicid[0] = boot_cpu_id; 507 init_cpu_present(cpumask_of(0)); 508 set_cpu_possible(0, true); 509 for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) { 510 sapicid = smp_boot_data.cpu_phys_id[i]; 511 if (sapicid == boot_cpu_id) 512 continue; 513 set_cpu_present(cpu, true); 514 set_cpu_possible(cpu, true); 515 ia64_cpu_to_sapicid[cpu] = sapicid; 516 cpu++; 517 } 518 } 519 520 /* 521 * Cycle through the APs sending Wakeup IPIs to boot each. 522 */ 523 void __init 524 smp_prepare_cpus (unsigned int max_cpus) 525 { 526 int boot_cpu_id = hard_smp_processor_id(); 527 528 /* 529 * Initialize the per-CPU profiling counter/multiplier 530 */ 531 532 smp_setup_percpu_timer(); 533 534 cpumask_set_cpu(0, &cpu_callin_map); 535 536 local_cpu_data->loops_per_jiffy = loops_per_jiffy; 537 ia64_cpu_to_sapicid[0] = boot_cpu_id; 538 539 printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id); 540 541 current_thread_info()->cpu = 0; 542 543 /* 544 * If SMP should be disabled, then really disable it! 545 */ 546 if (!max_cpus) { 547 printk(KERN_INFO "SMP mode deactivated.\n"); 548 init_cpu_online(cpumask_of(0)); 549 init_cpu_present(cpumask_of(0)); 550 init_cpu_possible(cpumask_of(0)); 551 return; 552 } 553 } 554 555 void smp_prepare_boot_cpu(void) 556 { 557 set_cpu_online(smp_processor_id(), true); 558 cpumask_set_cpu(smp_processor_id(), &cpu_callin_map); 559 set_numa_node(cpu_to_node_map[smp_processor_id()]); 560 per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; 561 } 562 563 #ifdef CONFIG_HOTPLUG_CPU 564 static inline void 565 clear_cpu_sibling_map(int cpu) 566 { 567 int i; 568 569 for_each_cpu(i, &per_cpu(cpu_sibling_map, cpu)) 570 cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, i)); 571 for_each_cpu(i, &cpu_core_map[cpu]) 572 cpumask_clear_cpu(cpu, &cpu_core_map[i]); 573 574 per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE; 575 } 576 577 static void 578 remove_siblinginfo(int cpu) 579 { 580 int last = 0; 581 582 if (cpu_data(cpu)->threads_per_core == 1 && 583 cpu_data(cpu)->cores_per_socket == 1) { 584 cpumask_clear_cpu(cpu, &cpu_core_map[cpu]); 585 cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); 586 return; 587 } 588 589 last = (cpumask_weight(&cpu_core_map[cpu]) == 1 ? 1 : 0); 590 591 /* remove it from all sibling map's */ 592 clear_cpu_sibling_map(cpu); 593 } 594 595 extern void fixup_irqs(void); 596 597 int migrate_platform_irqs(unsigned int cpu) 598 { 599 int new_cpei_cpu; 600 struct irq_data *data = NULL; 601 const struct cpumask *mask; 602 int retval = 0; 603 604 /* 605 * dont permit CPEI target to removed. 606 */ 607 if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) { 608 printk ("CPU (%d) is CPEI Target\n", cpu); 609 if (can_cpei_retarget()) { 610 /* 611 * Now re-target the CPEI to a different processor 612 */ 613 new_cpei_cpu = cpumask_any(cpu_online_mask); 614 mask = cpumask_of(new_cpei_cpu); 615 set_cpei_target_cpu(new_cpei_cpu); 616 data = irq_get_irq_data(ia64_cpe_irq); 617 /* 618 * Switch for now, immediately, we need to do fake intr 619 * as other interrupts, but need to study CPEI behaviour with 620 * polling before making changes. 621 */ 622 if (data && data->chip) { 623 data->chip->irq_disable(data); 624 data->chip->irq_set_affinity(data, mask, false); 625 data->chip->irq_enable(data); 626 printk ("Re-targeting CPEI to cpu %d\n", new_cpei_cpu); 627 } 628 } 629 if (!data) { 630 printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu); 631 retval = -EBUSY; 632 } 633 } 634 return retval; 635 } 636 637 /* must be called with cpucontrol mutex held */ 638 int __cpu_disable(void) 639 { 640 int cpu = smp_processor_id(); 641 642 /* 643 * dont permit boot processor for now 644 */ 645 if (cpu == 0 && !bsp_remove_ok) { 646 printk ("Your platform does not support removal of BSP\n"); 647 return (-EBUSY); 648 } 649 650 set_cpu_online(cpu, false); 651 652 if (migrate_platform_irqs(cpu)) { 653 set_cpu_online(cpu, true); 654 return -EBUSY; 655 } 656 657 remove_siblinginfo(cpu); 658 fixup_irqs(); 659 local_flush_tlb_all(); 660 cpumask_clear_cpu(cpu, &cpu_callin_map); 661 return 0; 662 } 663 664 void __cpu_die(unsigned int cpu) 665 { 666 unsigned int i; 667 668 for (i = 0; i < 100; i++) { 669 /* They ack this in play_dead by setting CPU_DEAD */ 670 if (per_cpu(cpu_state, cpu) == CPU_DEAD) 671 { 672 printk ("CPU %d is now offline\n", cpu); 673 return; 674 } 675 msleep(100); 676 } 677 printk(KERN_ERR "CPU %u didn't die...\n", cpu); 678 } 679 #endif /* CONFIG_HOTPLUG_CPU */ 680 681 void 682 smp_cpus_done (unsigned int dummy) 683 { 684 int cpu; 685 unsigned long bogosum = 0; 686 687 /* 688 * Allow the user to impress friends. 689 */ 690 691 for_each_online_cpu(cpu) { 692 bogosum += cpu_data(cpu)->loops_per_jiffy; 693 } 694 695 printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", 696 (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); 697 } 698 699 static inline void set_cpu_sibling_map(int cpu) 700 { 701 int i; 702 703 for_each_online_cpu(i) { 704 if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) { 705 cpumask_set_cpu(i, &cpu_core_map[cpu]); 706 cpumask_set_cpu(cpu, &cpu_core_map[i]); 707 if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) { 708 cpumask_set_cpu(i, 709 &per_cpu(cpu_sibling_map, cpu)); 710 cpumask_set_cpu(cpu, 711 &per_cpu(cpu_sibling_map, i)); 712 } 713 } 714 } 715 } 716 717 int 718 __cpu_up(unsigned int cpu, struct task_struct *tidle) 719 { 720 int ret; 721 int sapicid; 722 723 sapicid = ia64_cpu_to_sapicid[cpu]; 724 if (sapicid == -1) 725 return -EINVAL; 726 727 /* 728 * Already booted cpu? not valid anymore since we dont 729 * do idle loop tightspin anymore. 730 */ 731 if (cpumask_test_cpu(cpu, &cpu_callin_map)) 732 return -EINVAL; 733 734 per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; 735 /* Processor goes to start_secondary(), sets online flag */ 736 ret = do_boot_cpu(sapicid, cpu, tidle); 737 if (ret < 0) 738 return ret; 739 740 if (cpu_data(cpu)->threads_per_core == 1 && 741 cpu_data(cpu)->cores_per_socket == 1) { 742 cpumask_set_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); 743 cpumask_set_cpu(cpu, &cpu_core_map[cpu]); 744 return 0; 745 } 746 747 set_cpu_sibling_map(cpu); 748 749 return 0; 750 } 751 752 /* 753 * Assume that CPUs have been discovered by some platform-dependent interface. For 754 * SoftSDV/Lion, that would be ACPI. 755 * 756 * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP(). 757 */ 758 void __init 759 init_smp_config(void) 760 { 761 struct fptr { 762 unsigned long fp; 763 unsigned long gp; 764 } *ap_startup; 765 long sal_ret; 766 767 /* Tell SAL where to drop the APs. */ 768 ap_startup = (struct fptr *) start_ap; 769 sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ, 770 ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0); 771 if (sal_ret < 0) 772 printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n", 773 ia64_sal_strerror(sal_ret)); 774 } 775 776 /* 777 * identify_siblings(cpu) gets called from identify_cpu. This populates the 778 * information related to logical execution units in per_cpu_data structure. 779 */ 780 void identify_siblings(struct cpuinfo_ia64 *c) 781 { 782 long status; 783 u16 pltid; 784 pal_logical_to_physical_t info; 785 786 status = ia64_pal_logical_to_phys(-1, &info); 787 if (status != PAL_STATUS_SUCCESS) { 788 if (status != PAL_STATUS_UNIMPLEMENTED) { 789 printk(KERN_ERR 790 "ia64_pal_logical_to_phys failed with %ld\n", 791 status); 792 return; 793 } 794 795 info.overview_ppid = 0; 796 info.overview_cpp = 1; 797 info.overview_tpc = 1; 798 } 799 800 status = ia64_sal_physical_id_info(&pltid); 801 if (status != PAL_STATUS_SUCCESS) { 802 if (status != PAL_STATUS_UNIMPLEMENTED) 803 printk(KERN_ERR 804 "ia64_sal_pltid failed with %ld\n", 805 status); 806 return; 807 } 808 809 c->socket_id = (pltid << 8) | info.overview_ppid; 810 811 if (info.overview_cpp == 1 && info.overview_tpc == 1) 812 return; 813 814 c->cores_per_socket = info.overview_cpp; 815 c->threads_per_core = info.overview_tpc; 816 c->num_log = info.overview_num_log; 817 818 c->core_id = info.log1_cid; 819 c->thread_id = info.log1_tid; 820 } 821 822 /* 823 * returns non zero, if multi-threading is enabled 824 * on at least one physical package. Due to hotplug cpu 825 * and (maxcpus=), all threads may not necessarily be enabled 826 * even though the processor supports multi-threading. 827 */ 828 int is_multithreading_enabled(void) 829 { 830 int i, j; 831 832 for_each_present_cpu(i) { 833 for_each_present_cpu(j) { 834 if (j == i) 835 continue; 836 if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) { 837 if (cpu_data(j)->core_id == cpu_data(i)->core_id) 838 return 1; 839 } 840 } 841 } 842 return 0; 843 } 844 EXPORT_SYMBOL_GPL(is_multithreading_enabled); 845