arch/s390/kernel/smp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  SMP related functions
   4  *
   5  *    Copyright IBM Corp. 1999, 2012
   6  *    Author(s): Denis Joseph Barrow,
   7  *               Martin Schwidefsky <schwidefsky@de.ibm.com>,
   8  *               Heiko Carstens <heiko.carstens@de.ibm.com>,
   9  *
  10  *  based on other smp stuff by
  11  *    (c) 1995 Alan Cox, CymruNET Ltd  <alan@cymru.net>
  12  *    (c) 1998 Ingo Molnar
  13  *
  14  * The code outside of smp.c uses logical cpu numbers, only smp.c does
  15  * the translation of logical to physical cpu ids. All new code that
  16  * operates on physical cpu numbers needs to go into smp.c.
  17  */
  18
  19 #define KMSG_COMPONENT "cpu"
  20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  21
  22 #include <linux/workqueue.h>
  23 #include <linux/bootmem.h>
  24 #include <linux/export.h>
  25 #include <linux/init.h>
  26 #include <linux/mm.h>
  27 #include <linux/err.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/kernel_stat.h>
  30 #include <linux/kmemleak.h>
  31 #include <linux/delay.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/irqflags.h>
  34 #include <linux/cpu.h>
  35 #include <linux/slab.h>
  36 #include <linux/sched/hotplug.h>
  37 #include <linux/sched/task_stack.h>
  38 #include <linux/crash_dump.h>
  39 #include <linux/memblock.h>
  40 #include <asm/asm-offsets.h>
  41 #include <asm/diag.h>
  42 #include <asm/switch_to.h>
  43 #include <asm/facility.h>
  44 #include <asm/ipl.h>
  45 #include <asm/setup.h>
  46 #include <asm/irq.h>
  47 #include <asm/tlbflush.h>
  48 #include <asm/vtimer.h>
  49 #include <asm/lowcore.h>
  50 #include <asm/sclp.h>
  51 #include <asm/vdso.h>
  52 #include <asm/debug.h>
  53 #include <asm/os_info.h>
  54 #include <asm/sigp.h>
  55 #include <asm/idle.h>
  56 #include <asm/nmi.h>
  57 #include "entry.h"
  58
  59 enum {
  60         ec_schedule = 0,
  61         ec_call_function_single,
  62         ec_stop_cpu,
  63 };
  64
  65 enum {
  66         CPU_STATE_STANDBY,
  67         CPU_STATE_CONFIGURED,
  68 };
  69
  70 static DEFINE_PER_CPU(struct cpu *, cpu_device);
  71
  72 struct pcpu {
  73         struct lowcore *lowcore;        /* lowcore page(s) for the cpu */
  74         unsigned long ec_mask;          /* bit mask for ec_xxx functions */
  75         unsigned long ec_clk;           /* sigp timestamp for ec_xxx */
  76         signed char state;              /* physical cpu state */
  77         signed char polarization;       /* physical polarization */
  78         u16 address;                    /* physical cpu address */
  79 };
  80
  81 static u8 boot_core_type;
  82 static struct pcpu pcpu_devices[NR_CPUS];
  83
  84 static struct kmem_cache *pcpu_mcesa_cache;
  85
  86 unsigned int smp_cpu_mt_shift;
  87 EXPORT_SYMBOL(smp_cpu_mt_shift);
  88
  89 unsigned int smp_cpu_mtid;
  90 EXPORT_SYMBOL(smp_cpu_mtid);
  91
  92 #ifdef CONFIG_CRASH_DUMP
  93 __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
  94 #endif
  95
  96 static unsigned int smp_max_threads __initdata = -1U;
  97
  98 static int __init early_nosmt(char *s)
  99 {
 100         smp_max_threads = 1;
 101         return 0;
 102 }
 103 early_param("nosmt", early_nosmt);
 104
 105 static int __init early_smt(char *s)
 106 {
 107         get_option(&s, &smp_max_threads);
 108         return 0;
 109 }
 110 early_param("smt", early_smt);
 111
 112 /*
 113  * The smp_cpu_state_mutex must be held when changing the state or polarization
 114  * member of a pcpu data structure within the pcpu_devices arreay.
 115  */
 116 DEFINE_MUTEX(smp_cpu_state_mutex);
 117
 118 /*
 119  * Signal processor helper functions.
 120  */
 121 static inline int __pcpu_sigp_relax(u16 addr, u8 order, unsigned long parm)
 122 {
 123         int cc;
 124
 125         while (1) {
 126                 cc = __pcpu_sigp(addr, order, parm, NULL);
 127                 if (cc != SIGP_CC_BUSY)
 128                         return cc;
 129                 cpu_relax();
 130         }
 131 }
 132
 133 static int pcpu_sigp_retry(struct pcpu *pcpu, u8 order, u32 parm)
 134 {
 135         int cc, retry;
 136
 137         for (retry = 0; ; retry++) {
 138                 cc = __pcpu_sigp(pcpu->address, order, parm, NULL);
 139                 if (cc != SIGP_CC_BUSY)
 140                         break;
 141                 if (retry >= 3)
 142                         udelay(10);
 143         }
 144         return cc;
 145 }
 146
 147 static inline int pcpu_stopped(struct pcpu *pcpu)
 148 {
 149         u32 uninitialized_var(status);
 150
 151         if (__pcpu_sigp(pcpu->address, SIGP_SENSE,
 152                         0, &status) != SIGP_CC_STATUS_STORED)
 153                 return 0;
 154         return !!(status & (SIGP_STATUS_CHECK_STOP|SIGP_STATUS_STOPPED));
 155 }
 156
 157 static inline int pcpu_running(struct pcpu *pcpu)
 158 {
 159         if (__pcpu_sigp(pcpu->address, SIGP_SENSE_RUNNING,
 160                         0, NULL) != SIGP_CC_STATUS_STORED)
 161                 return 1;
 162         /* Status stored condition code is equivalent to cpu not running. */
 163         return 0;
 164 }
 165
 166 /*
 167  * Find struct pcpu by cpu address.
 168  */
 169 static struct pcpu *pcpu_find_address(const struct cpumask *mask, u16 address)
 170 {
 171         int cpu;
 172
 173         for_each_cpu(cpu, mask)
 174                 if (pcpu_devices[cpu].address == address)
 175                         return pcpu_devices + cpu;
 176         return NULL;
 177 }
 178
 179 static void pcpu_ec_call(struct pcpu *pcpu, int ec_bit)
 180 {
 181         int order;
 182
 183         if (test_and_set_bit(ec_bit, &pcpu->ec_mask))
 184                 return;
 185         order = pcpu_running(pcpu) ? SIGP_EXTERNAL_CALL : SIGP_EMERGENCY_SIGNAL;
 186         pcpu->ec_clk = get_tod_clock_fast();
 187         pcpu_sigp_retry(pcpu, order, 0);
 188 }
 189
 190 #define ASYNC_FRAME_OFFSET (ASYNC_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE)
 191 #define PANIC_FRAME_OFFSET (PAGE_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE)
 192
 193 static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
 194 {
 195         unsigned long async_stack, panic_stack;
 196         unsigned long mcesa_origin, mcesa_bits;
 197         struct lowcore *lc;
 198
 199         mcesa_origin = mcesa_bits = 0;
 200         if (pcpu != &pcpu_devices[0]) {
 201                 pcpu->lowcore = (struct lowcore *)
 202                         __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
 203                 async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
 204                 panic_stack = __get_free_page(GFP_KERNEL);
 205                 if (!pcpu->lowcore || !panic_stack || !async_stack)
 206                         goto out;
 207                 if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
 208                         mcesa_origin = (unsigned long)
 209                                 kmem_cache_alloc(pcpu_mcesa_cache, GFP_KERNEL);
 210                         if (!mcesa_origin)
 211                                 goto out;
 212                         /* The pointer is stored with mcesa_bits ORed in */
 213                         kmemleak_not_leak((void *) mcesa_origin);
 214                         mcesa_bits = MACHINE_HAS_GS ? 11 : 0;
 215                 }
 216         } else {
 217                 async_stack = pcpu->lowcore->async_stack - ASYNC_FRAME_OFFSET;
 218                 panic_stack = pcpu->lowcore->panic_stack - PANIC_FRAME_OFFSET;
 219                 mcesa_origin = pcpu->lowcore->mcesad & MCESA_ORIGIN_MASK;
 220                 mcesa_bits = pcpu->lowcore->mcesad & MCESA_LC_MASK;
 221         }
 222         lc = pcpu->lowcore;
 223         memcpy(lc, &S390_lowcore, 512);
 224         memset((char *) lc + 512, 0, sizeof(*lc) - 512);
 225         lc->async_stack = async_stack + ASYNC_FRAME_OFFSET;
 226         lc->panic_stack = panic_stack + PANIC_FRAME_OFFSET;
 227         lc->mcesad = mcesa_origin | mcesa_bits;
 228         lc->cpu_nr = cpu;
 229         lc->spinlock_lockval = arch_spin_lockval(cpu);
 230         if (vdso_alloc_per_cpu(lc))
 231                 goto out;
 232         lowcore_ptr[cpu] = lc;
 233         pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, (u32)(unsigned long) lc);
 234         return 0;
 235 out:
 236         if (pcpu != &pcpu_devices[0]) {
 237                 if (mcesa_origin)
 238                         kmem_cache_free(pcpu_mcesa_cache,
 239                                         (void *) mcesa_origin);
 240                 free_page(panic_stack);
 241                 free_pages(async_stack, ASYNC_ORDER);
 242                 free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
 243         }
 244         return -ENOMEM;
 245 }
 246
 247 #ifdef CONFIG_HOTPLUG_CPU
 248
 249 static void pcpu_free_lowcore(struct pcpu *pcpu)
 250 {
 251         unsigned long mcesa_origin;
 252
 253         pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, 0);
 254         lowcore_ptr[pcpu - pcpu_devices] = NULL;
 255         vdso_free_per_cpu(pcpu->lowcore);
 256         if (pcpu == &pcpu_devices[0])
 257                 return;
 258         if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
 259                 mcesa_origin = pcpu->lowcore->mcesad & MCESA_ORIGIN_MASK;
 260                 kmem_cache_free(pcpu_mcesa_cache, (void *) mcesa_origin);
 261         }
 262         free_page(pcpu->lowcore->panic_stack-PANIC_FRAME_OFFSET);
 263         free_pages(pcpu->lowcore->async_stack-ASYNC_FRAME_OFFSET, ASYNC_ORDER);
 264         free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
 265 }
 266
 267 #endif /* CONFIG_HOTPLUG_CPU */
 268
 269 static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
 270 {
 271         struct lowcore *lc = pcpu->lowcore;
 272
 273         cpumask_set_cpu(cpu, &init_mm.context.cpu_attach_mask);
 274         cpumask_set_cpu(cpu, mm_cpumask(&init_mm));
 275         lc->cpu_nr = cpu;
 276         lc->spinlock_lockval = arch_spin_lockval(cpu);
 277         lc->percpu_offset = __per_cpu_offset[cpu];
 278         lc->kernel_asce = S390_lowcore.kernel_asce;
 279         lc->machine_flags = S390_lowcore.machine_flags;
 280         lc->user_timer = lc->system_timer = lc->steal_timer = 0;
 281         __ctl_store(lc->cregs_save_area, 0, 15);
 282         save_access_regs((unsigned int *) lc->access_regs_save_area);
 283         memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
 284                MAX_FACILITY_BIT/8);
 285 }
 286
 287 static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk)
 288 {
 289         struct lowcore *lc = pcpu->lowcore;
 290
 291         lc->kernel_stack = (unsigned long) task_stack_page(tsk)
 292                 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
 293         lc->current_task = (unsigned long) tsk;
 294         lc->lpp = LPP_MAGIC;
 295         lc->current_pid = tsk->pid;
 296         lc->user_timer = tsk->thread.user_timer;
 297         lc->guest_timer = tsk->thread.guest_timer;
 298         lc->system_timer = tsk->thread.system_timer;
 299         lc->hardirq_timer = tsk->thread.hardirq_timer;
 300         lc->softirq_timer = tsk->thread.softirq_timer;
 301         lc->steal_timer = 0;
 302 }
 303
 304 static void pcpu_start_fn(struct pcpu *pcpu, void (*func)(void *), void *data)
 305 {
 306         struct lowcore *lc = pcpu->lowcore;
 307
 308         lc->restart_stack = lc->kernel_stack;
 309         lc->restart_fn = (unsigned long) func;
 310         lc->restart_data = (unsigned long) data;
 311         lc->restart_source = -1UL;
 312         pcpu_sigp_retry(pcpu, SIGP_RESTART, 0);
 313 }
 314
 315 /*
 316  * Call function via PSW restart on pcpu and stop the current cpu.
 317  */
 318 static void pcpu_delegate(struct pcpu *pcpu, void (*func)(void *),
 319                           void *data, unsigned long stack)
 320 {
 321         struct lowcore *lc = lowcore_ptr[pcpu - pcpu_devices];
 322         unsigned long source_cpu = stap();
 323
 324         __load_psw_mask(PSW_KERNEL_BITS);
 325         if (pcpu->address == source_cpu)
 326                 func(data);     /* should not return */
 327         /* Stop target cpu (if func returns this stops the current cpu). */
 328         pcpu_sigp_retry(pcpu, SIGP_STOP, 0);
 329         /* Restart func on the target cpu and stop the current cpu. */
 330         mem_assign_absolute(lc->restart_stack, stack);
 331         mem_assign_absolute(lc->restart_fn, (unsigned long) func);
 332         mem_assign_absolute(lc->restart_data, (unsigned long) data);
 333         mem_assign_absolute(lc->restart_source, source_cpu);
 334         asm volatile(
 335                 "0:     sigp    0,%0,%2 # sigp restart to target cpu\n"
 336                 "       brc     2,0b    # busy, try again\n"
 337                 "1:     sigp    0,%1,%3 # sigp stop to current cpu\n"
 338                 "       brc     2,1b    # busy, try again\n"
 339                 : : "d" (pcpu->address), "d" (source_cpu),
 340                     "K" (SIGP_RESTART), "K" (SIGP_STOP)
 341                 : "0", "1", "cc");
 342         for (;;) ;
 343 }
 344
 345 /*
 346  * Enable additional logical cpus for multi-threading.
 347  */
 348 static int pcpu_set_smt(unsigned int mtid)
 349 {
 350         int cc;
 351
 352         if (smp_cpu_mtid == mtid)
 353                 return 0;
 354         cc = __pcpu_sigp(0, SIGP_SET_MULTI_THREADING, mtid, NULL);
 355         if (cc == 0) {
 356                 smp_cpu_mtid = mtid;
 357                 smp_cpu_mt_shift = 0;
 358                 while (smp_cpu_mtid >= (1U << smp_cpu_mt_shift))
 359                         smp_cpu_mt_shift++;
 360                 pcpu_devices[0].address = stap();
 361         }
 362         return cc;
 363 }
 364
 365 /*
 366  * Call function on an online CPU.
 367  */
 368 void smp_call_online_cpu(void (*func)(void *), void *data)
 369 {
 370         struct pcpu *pcpu;
 371
 372         /* Use the current cpu if it is online. */
 373         pcpu = pcpu_find_address(cpu_online_mask, stap());
 374         if (!pcpu)
 375                 /* Use the first online cpu. */
 376                 pcpu = pcpu_devices + cpumask_first(cpu_online_mask);
 377         pcpu_delegate(pcpu, func, data, (unsigned long) restart_stack);
 378 }
 379
 380 /*
 381  * Call function on the ipl CPU.
 382  */
 383 void smp_call_ipl_cpu(void (*func)(void *), void *data)
 384 {
 385         pcpu_delegate(&pcpu_devices[0], func, data,
 386                       pcpu_devices->lowcore->panic_stack -
 387                       PANIC_FRAME_OFFSET + PAGE_SIZE);
 388 }
 389
 390 int smp_find_processor_id(u16 address)
 391 {
 392         int cpu;
 393
 394         for_each_present_cpu(cpu)
 395                 if (pcpu_devices[cpu].address == address)
 396                         return cpu;
 397         return -1;
 398 }
 399
 400 bool arch_vcpu_is_preempted(int cpu)
 401 {
 402         if (test_cpu_flag_of(CIF_ENABLED_WAIT, cpu))
 403                 return false;
 404         if (pcpu_running(pcpu_devices + cpu))
 405                 return false;
 406         return true;
 407 }
 408 EXPORT_SYMBOL(arch_vcpu_is_preempted);
 409
 410 void smp_yield_cpu(int cpu)
 411 {
 412         if (MACHINE_HAS_DIAG9C) {
 413                 diag_stat_inc_norecursion(DIAG_STAT_X09C);
 414                 asm volatile("diag %0,0,0x9c"
 415                              : : "d" (pcpu_devices[cpu].address));
 416         } else if (MACHINE_HAS_DIAG44) {
 417                 diag_stat_inc_norecursion(DIAG_STAT_X044);
 418                 asm volatile("diag 0,0,0x44");
 419         }
 420 }
 421
 422 /*
 423  * Send cpus emergency shutdown signal. This gives the cpus the
 424  * opportunity to complete outstanding interrupts.
 425  */
 426 static void smp_emergency_stop(cpumask_t *cpumask)
 427 {
 428         u64 end;
 429         int cpu;
 430
 431         end = get_tod_clock() + (1000000UL << 12);
 432         for_each_cpu(cpu, cpumask) {
 433                 struct pcpu *pcpu = pcpu_devices + cpu;
 434                 set_bit(ec_stop_cpu, &pcpu->ec_mask);
 435                 while (__pcpu_sigp(pcpu->address, SIGP_EMERGENCY_SIGNAL,
 436                                    0, NULL) == SIGP_CC_BUSY &&
 437                        get_tod_clock() < end)
 438                         cpu_relax();
 439         }
 440         while (get_tod_clock() < end) {
 441                 for_each_cpu(cpu, cpumask)
 442                         if (pcpu_stopped(pcpu_devices + cpu))
 443                                 cpumask_clear_cpu(cpu, cpumask);
 444                 if (cpumask_empty(cpumask))
 445                         break;
 446                 cpu_relax();
 447         }
 448 }
 449
 450 /*
 451  * Stop all cpus but the current one.
 452  */
 453 void smp_send_stop(void)
 454 {
 455         cpumask_t cpumask;
 456         int cpu;
 457
 458         /* Disable all interrupts/machine checks */
 459         __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
 460         trace_hardirqs_off();
 461
 462         debug_set_critical();
 463         cpumask_copy(&cpumask, cpu_online_mask);
 464         cpumask_clear_cpu(smp_processor_id(), &cpumask);
 465
 466         if (oops_in_progress)
 467                 smp_emergency_stop(&cpumask);
 468
 469         /* stop all processors */
 470         for_each_cpu(cpu, &cpumask) {
 471                 struct pcpu *pcpu = pcpu_devices + cpu;
 472                 pcpu_sigp_retry(pcpu, SIGP_STOP, 0);
 473                 while (!pcpu_stopped(pcpu))
 474                         cpu_relax();
 475         }
 476 }
 477
 478 /*
 479  * This is the main routine where commands issued by other
 480  * cpus are handled.
 481  */
 482 static void smp_handle_ext_call(void)
 483 {
 484         unsigned long bits;
 485
 486         /* handle bit signal external calls */
 487         bits = xchg(&pcpu_devices[smp_processor_id()].ec_mask, 0);
 488         if (test_bit(ec_stop_cpu, &bits))
 489                 smp_stop_cpu();
 490         if (test_bit(ec_schedule, &bits))
 491                 scheduler_ipi();
 492         if (test_bit(ec_call_function_single, &bits))
 493                 generic_smp_call_function_single_interrupt();
 494 }
 495
 496 static void do_ext_call_interrupt(struct ext_code ext_code,
 497                                   unsigned int param32, unsigned long param64)
 498 {
 499         inc_irq_stat(ext_code.code == 0x1202 ? IRQEXT_EXC : IRQEXT_EMS);
 500         smp_handle_ext_call();
 501 }
 502
 503 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 504 {
 505         int cpu;
 506
 507         for_each_cpu(cpu, mask)
 508                 pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single);
 509 }
 510
 511 void arch_send_call_function_single_ipi(int cpu)
 512 {
 513         pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single);
 514 }
 515
 516 /*
 517  * this function sends a 'reschedule' IPI to another CPU.
 518  * it goes straight through and wastes no time serializing
 519  * anything. Worst case is that we lose a reschedule ...
 520  */
 521 void smp_send_reschedule(int cpu)
 522 {
 523         pcpu_ec_call(pcpu_devices + cpu, ec_schedule);
 524 }
 525
 526 /*
 527  * parameter area for the set/clear control bit callbacks
 528  */
 529 struct ec_creg_mask_parms {
 530         unsigned long orval;
 531         unsigned long andval;
 532         int cr;
 533 };
 534
 535 /*
 536  * callback for setting/clearing control bits
 537  */
 538 static void smp_ctl_bit_callback(void *info)
 539 {
 540         struct ec_creg_mask_parms *pp = info;
 541         unsigned long cregs[16];
 542
 543         __ctl_store(cregs, 0, 15);
 544         cregs[pp->cr] = (cregs[pp->cr] & pp->andval) | pp->orval;
 545         __ctl_load(cregs, 0, 15);
 546 }
 547
 548 /*
 549  * Set a bit in a control register of all cpus
 550  */
 551 void smp_ctl_set_bit(int cr, int bit)
 552 {
 553         struct ec_creg_mask_parms parms = { 1UL << bit, -1UL, cr };
 554
 555         on_each_cpu(smp_ctl_bit_callback, &parms, 1);
 556 }
 557 EXPORT_SYMBOL(smp_ctl_set_bit);
 558
 559 /*
 560  * Clear a bit in a control register of all cpus
 561  */
 562 void smp_ctl_clear_bit(int cr, int bit)
 563 {
 564         struct ec_creg_mask_parms parms = { 0, ~(1UL << bit), cr };
 565
 566         on_each_cpu(smp_ctl_bit_callback, &parms, 1);
 567 }
 568 EXPORT_SYMBOL(smp_ctl_clear_bit);
 569
 570 #ifdef CONFIG_CRASH_DUMP
 571
 572 int smp_store_status(int cpu)
 573 {
 574         struct pcpu *pcpu = pcpu_devices + cpu;
 575         unsigned long pa;
 576
 577         pa = __pa(&pcpu->lowcore->floating_pt_save_area);
 578         if (__pcpu_sigp_relax(pcpu->address, SIGP_STORE_STATUS_AT_ADDRESS,
 579                               pa) != SIGP_CC_ORDER_CODE_ACCEPTED)
 580                 return -EIO;
 581         if (!MACHINE_HAS_VX && !MACHINE_HAS_GS)
 582                 return 0;
 583         pa = __pa(pcpu->lowcore->mcesad & MCESA_ORIGIN_MASK);
 584         if (MACHINE_HAS_GS)
 585                 pa |= pcpu->lowcore->mcesad & MCESA_LC_MASK;
 586         if (__pcpu_sigp_relax(pcpu->address, SIGP_STORE_ADDITIONAL_STATUS,
 587                               pa) != SIGP_CC_ORDER_CODE_ACCEPTED)
 588                 return -EIO;
 589         return 0;
 590 }
 591
 592 /*
 593  * Collect CPU state of the previous, crashed system.
 594  * There are four cases:
 595  * 1) standard zfcp dump
 596  *    condition: OLDMEM_BASE == NULL && ipl_info.type == IPL_TYPE_FCP_DUMP
 597  *    The state for all CPUs except the boot CPU needs to be collected
 598  *    with sigp stop-and-store-status. The boot CPU state is located in
 599  *    the absolute lowcore of the memory stored in the HSA. The zcore code
 600  *    will copy the boot CPU state from the HSA.
 601  * 2) stand-alone kdump for SCSI (zfcp dump with swapped memory)
 602  *    condition: OLDMEM_BASE != NULL && ipl_info.type == IPL_TYPE_FCP_DUMP
 603  *    The state for all CPUs except the boot CPU needs to be collected
 604  *    with sigp stop-and-store-status. The firmware or the boot-loader
 605  *    stored the registers of the boot CPU in the absolute lowcore in the
 606  *    memory of the old system.
 607  * 3) kdump and the old kernel did not store the CPU state,
 608  *    or stand-alone kdump for DASD
 609  *    condition: OLDMEM_BASE != NULL && !is_kdump_kernel()
 610  *    The state for all CPUs except the boot CPU needs to be collected
 611  *    with sigp stop-and-store-status. The kexec code or the boot-loader
 612  *    stored the registers of the boot CPU in the memory of the old system.
 613  * 4) kdump and the old kernel stored the CPU state
 614  *    condition: OLDMEM_BASE != NULL && is_kdump_kernel()
 615  *    This case does not exist for s390 anymore, setup_arch explicitly
 616  *    deactivates the elfcorehdr= kernel parameter
 617  */
 618 static __init void smp_save_cpu_vxrs(struct save_area *sa, u16 addr,
 619                                      bool is_boot_cpu, unsigned long page)
 620 {
 621         __vector128 *vxrs = (__vector128 *) page;
 622
 623         if (is_boot_cpu)
 624                 vxrs = boot_cpu_vector_save_area;
 625         else
 626                 __pcpu_sigp_relax(addr, SIGP_STORE_ADDITIONAL_STATUS, page);
 627         save_area_add_vxrs(sa, vxrs);
 628 }
 629
 630 static __init void smp_save_cpu_regs(struct save_area *sa, u16 addr,
 631                                      bool is_boot_cpu, unsigned long page)
 632 {
 633         void *regs = (void *) page;
 634
 635         if (is_boot_cpu)
 636                 copy_oldmem_kernel(regs, (void *) __LC_FPREGS_SAVE_AREA, 512);
 637         else
 638                 __pcpu_sigp_relax(addr, SIGP_STORE_STATUS_AT_ADDRESS, page);
 639         save_area_add_regs(sa, regs);
 640 }
 641
 642 void __init smp_save_dump_cpus(void)
 643 {
 644         int addr, boot_cpu_addr, max_cpu_addr;
 645         struct save_area *sa;
 646         unsigned long page;
 647         bool is_boot_cpu;
 648
 649         if (!(OLDMEM_BASE || ipl_info.type == IPL_TYPE_FCP_DUMP))
 650                 /* No previous system present, normal boot. */
 651                 return;
 652         /* Allocate a page as dumping area for the store status sigps */
 653         page = memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, 1UL << 31);
 654         /* Set multi-threading state to the previous system. */
 655         pcpu_set_smt(sclp.mtid_prev);
 656         boot_cpu_addr = stap();
 657         max_cpu_addr = SCLP_MAX_CORES << sclp.mtid_prev;
 658         for (addr = 0; addr <= max_cpu_addr; addr++) {
 659                 if (__pcpu_sigp_relax(addr, SIGP_SENSE, 0) ==
 660                     SIGP_CC_NOT_OPERATIONAL)
 661                         continue;
 662                 is_boot_cpu = (addr == boot_cpu_addr);
 663                 /* Allocate save area */
 664                 sa = save_area_alloc(is_boot_cpu);
 665                 if (!sa)
 666                         panic("could not allocate memory for save area\n");
 667                 if (MACHINE_HAS_VX)
 668                         /* Get the vector registers */
 669                         smp_save_cpu_vxrs(sa, addr, is_boot_cpu, page);
 670                 /*
 671                  * For a zfcp dump OLDMEM_BASE == NULL and the registers
 672                  * of the boot CPU are stored in the HSA. To retrieve
 673                  * these registers an SCLP request is required which is
 674                  * done by drivers/s390/char/zcore.c:init_cpu_info()
 675                  */
 676                 if (!is_boot_cpu || OLDMEM_BASE)
 677                         /* Get the CPU registers */
 678                         smp_save_cpu_regs(sa, addr, is_boot_cpu, page);
 679         }
 680         memblock_free(page, PAGE_SIZE);
 681         diag308_reset();
 682         pcpu_set_smt(0);
 683 }
 684 #endif /* CONFIG_CRASH_DUMP */
 685
 686 void smp_cpu_set_polarization(int cpu, int val)
 687 {
 688         pcpu_devices[cpu].polarization = val;
 689 }
 690
 691 int smp_cpu_get_polarization(int cpu)
 692 {
 693         return pcpu_devices[cpu].polarization;
 694 }
 695
 696 static void __ref smp_get_core_info(struct sclp_core_info *info, int early)
 697 {
 698         static int use_sigp_detection;
 699         int address;
 700
 701         if (use_sigp_detection || sclp_get_core_info(info, early)) {
 702                 use_sigp_detection = 1;
 703                 for (address = 0;
 704                      address < (SCLP_MAX_CORES << smp_cpu_mt_shift);
 705                      address += (1U << smp_cpu_mt_shift)) {
 706                         if (__pcpu_sigp_relax(address, SIGP_SENSE, 0) ==
 707                             SIGP_CC_NOT_OPERATIONAL)
 708                                 continue;
 709                         info->core[info->configured].core_id =
 710                                 address >> smp_cpu_mt_shift;
 711                         info->configured++;
 712                 }
 713                 info->combined = info->configured;
 714         }
 715 }
 716
 717 static int smp_add_present_cpu(int cpu);
 718
 719 static int __smp_rescan_cpus(struct sclp_core_info *info, int sysfs_add)
 720 {
 721         struct pcpu *pcpu;
 722         cpumask_t avail;
 723         int cpu, nr, i, j;
 724         u16 address;
 725
 726         nr = 0;
 727         cpumask_xor(&avail, cpu_possible_mask, cpu_present_mask);
 728         cpu = cpumask_first(&avail);
 729         for (i = 0; (i < info->combined) && (cpu < nr_cpu_ids); i++) {
 730                 if (sclp.has_core_type && info->core[i].type != boot_core_type)
 731                         continue;
 732                 address = info->core[i].core_id << smp_cpu_mt_shift;
 733                 for (j = 0; j <= smp_cpu_mtid; j++) {
 734                         if (pcpu_find_address(cpu_present_mask, address + j))
 735                                 continue;
 736                         pcpu = pcpu_devices + cpu;
 737                         pcpu->address = address + j;
 738                         pcpu->state =
 739                                 (cpu >= info->configured*(smp_cpu_mtid + 1)) ?
 740                                 CPU_STATE_STANDBY : CPU_STATE_CONFIGURED;
 741                         smp_cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
 742                         set_cpu_present(cpu, true);
 743                         if (sysfs_add && smp_add_present_cpu(cpu) != 0)
 744                                 set_cpu_present(cpu, false);
 745                         else
 746                                 nr++;
 747                         cpu = cpumask_next(cpu, &avail);
 748                         if (cpu >= nr_cpu_ids)
 749                                 break;
 750                 }
 751         }
 752         return nr;
 753 }
 754
 755 void __init smp_detect_cpus(void)
 756 {
 757         unsigned int cpu, mtid, c_cpus, s_cpus;
 758         struct sclp_core_info *info;
 759         u16 address;
 760
 761         /* Get CPU information */
 762         info = memblock_virt_alloc(sizeof(*info), 8);
 763         smp_get_core_info(info, 1);
 764         /* Find boot CPU type */
 765         if (sclp.has_core_type) {
 766                 address = stap();
 767                 for (cpu = 0; cpu < info->combined; cpu++)
 768                         if (info->core[cpu].core_id == address) {
 769                                 /* The boot cpu dictates the cpu type. */
 770                                 boot_core_type = info->core[cpu].type;
 771                                 break;
 772                         }
 773                 if (cpu >= info->combined)
 774                         panic("Could not find boot CPU type");
 775         }
 776
 777         /* Set multi-threading state for the current system */
 778         mtid = boot_core_type ? sclp.mtid : sclp.mtid_cp;
 779         mtid = (mtid < smp_max_threads) ? mtid : smp_max_threads - 1;
 780         pcpu_set_smt(mtid);
 781
 782         /* Print number of CPUs */
 783         c_cpus = s_cpus = 0;
 784         for (cpu = 0; cpu < info->combined; cpu++) {
 785                 if (sclp.has_core_type &&
 786                     info->core[cpu].type != boot_core_type)
 787                         continue;
 788                 if (cpu < info->configured)
 789                         c_cpus += smp_cpu_mtid + 1;
 790                 else
 791                         s_cpus += smp_cpu_mtid + 1;
 792         }
 793         pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus);
 794
 795         /* Add CPUs present at boot */
 796         get_online_cpus();
 797         __smp_rescan_cpus(info, 0);
 798         put_online_cpus();
 799         memblock_free_early((unsigned long)info, sizeof(*info));
 800 }
 801
 802 /*
 803  *      Activate a secondary processor.
 804  */
 805 static void smp_start_secondary(void *cpuvoid)
 806 {
 807         S390_lowcore.last_update_clock = get_tod_clock();
 808         S390_lowcore.restart_stack = (unsigned long) restart_stack;
 809         S390_lowcore.restart_fn = (unsigned long) do_restart;
 810         S390_lowcore.restart_data = 0;
 811         S390_lowcore.restart_source = -1UL;
 812         restore_access_regs(S390_lowcore.access_regs_save_area);
 813         __ctl_load(S390_lowcore.cregs_save_area, 0, 15);
 814         __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
 815         cpu_init();
 816         preempt_disable();
 817         init_cpu_timer();
 818         vtime_init();
 819         pfault_init();
 820         notify_cpu_starting(smp_processor_id());
 821         set_cpu_online(smp_processor_id(), true);
 822         inc_irq_stat(CPU_RST);
 823         local_irq_enable();
 824         cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
 825 }
 826
 827 /* Upping and downing of CPUs */
 828 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 829 {
 830         struct pcpu *pcpu;
 831         int base, i, rc;
 832
 833         pcpu = pcpu_devices + cpu;
 834         if (pcpu->state != CPU_STATE_CONFIGURED)
 835                 return -EIO;
 836         base = smp_get_base_cpu(cpu);
 837         for (i = 0; i <= smp_cpu_mtid; i++) {
 838                 if (base + i < nr_cpu_ids)
 839                         if (cpu_online(base + i))
 840                                 break;
 841         }
 842         /*
 843          * If this is the first CPU of the core to get online
 844          * do an initial CPU reset.
 845          */
 846         if (i > smp_cpu_mtid &&
 847             pcpu_sigp_retry(pcpu_devices + base, SIGP_INITIAL_CPU_RESET, 0) !=
 848             SIGP_CC_ORDER_CODE_ACCEPTED)
 849                 return -EIO;
 850
 851         rc = pcpu_alloc_lowcore(pcpu, cpu);
 852         if (rc)
 853                 return rc;
 854         pcpu_prepare_secondary(pcpu, cpu);
 855         pcpu_attach_task(pcpu, tidle);
 856         pcpu_start_fn(pcpu, smp_start_secondary, NULL);
 857         /* Wait until cpu puts itself in the online & active maps */
 858         while (!cpu_online(cpu))
 859                 cpu_relax();
 860         return 0;
 861 }
 862
 863 static unsigned int setup_possible_cpus __initdata;
 864
 865 static int __init _setup_possible_cpus(char *s)
 866 {
 867         get_option(&s, &setup_possible_cpus);
 868         return 0;
 869 }
 870 early_param("possible_cpus", _setup_possible_cpus);
 871
 872 #ifdef CONFIG_HOTPLUG_CPU
 873
 874 int __cpu_disable(void)
 875 {
 876         unsigned long cregs[16];
 877
 878         /* Handle possible pending IPIs */
 879         smp_handle_ext_call();
 880         set_cpu_online(smp_processor_id(), false);
 881         /* Disable pseudo page faults on this cpu. */
 882         pfault_fini();
 883         /* Disable interrupt sources via control register. */
 884         __ctl_store(cregs, 0, 15);
 885         cregs[0]  &= ~0x0000ee70UL;     /* disable all external interrupts */
 886         cregs[6]  &= ~0xff000000UL;     /* disable all I/O interrupts */
 887         cregs[14] &= ~0x1f000000UL;     /* disable most machine checks */
 888         __ctl_load(cregs, 0, 15);
 889         clear_cpu_flag(CIF_NOHZ_DELAY);
 890         return 0;
 891 }
 892
 893 void __cpu_die(unsigned int cpu)
 894 {
 895         struct pcpu *pcpu;
 896
 897         /* Wait until target cpu is down */
 898         pcpu = pcpu_devices + cpu;
 899         while (!pcpu_stopped(pcpu))
 900                 cpu_relax();
 901         pcpu_free_lowcore(pcpu);
 902         cpumask_clear_cpu(cpu, mm_cpumask(&init_mm));
 903         cpumask_clear_cpu(cpu, &init_mm.context.cpu_attach_mask);
 904 }
 905
 906 void __noreturn cpu_die(void)
 907 {
 908         idle_task_exit();
 909         pcpu_sigp_retry(pcpu_devices + smp_processor_id(), SIGP_STOP, 0);
 910         for (;;) ;
 911 }
 912
 913 #endif /* CONFIG_HOTPLUG_CPU */
 914
 915 void __init smp_fill_possible_mask(void)
 916 {
 917         unsigned int possible, sclp_max, cpu;
 918
 919         sclp_max = max(sclp.mtid, sclp.mtid_cp) + 1;
 920         sclp_max = min(smp_max_threads, sclp_max);
 921         sclp_max = (sclp.max_cores * sclp_max) ?: nr_cpu_ids;
 922         possible = setup_possible_cpus ?: nr_cpu_ids;
 923         possible = min(possible, sclp_max);
 924         for (cpu = 0; cpu < possible && cpu < nr_cpu_ids; cpu++)
 925                 set_cpu_possible(cpu, true);
 926 }
 927
 928 void __init smp_prepare_cpus(unsigned int max_cpus)
 929 {
 930         unsigned long size;
 931
 932         /* request the 0x1201 emergency signal external interrupt */
 933         if (register_external_irq(EXT_IRQ_EMERGENCY_SIG, do_ext_call_interrupt))
 934                 panic("Couldn't request external interrupt 0x1201");
 935         /* request the 0x1202 external call external interrupt */
 936         if (register_external_irq(EXT_IRQ_EXTERNAL_CALL, do_ext_call_interrupt))
 937                 panic("Couldn't request external interrupt 0x1202");
 938         /* create slab cache for the machine-check-extended-save-areas */
 939         if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
 940                 size = 1UL << (MACHINE_HAS_GS ? 11 : 10);
 941                 pcpu_mcesa_cache = kmem_cache_create("nmi_save_areas",
 942                                                      size, size, 0, NULL);
 943                 if (!pcpu_mcesa_cache)
 944                         panic("Couldn't create nmi save area cache");
 945         }
 946 }
 947
 948 void __init smp_prepare_boot_cpu(void)
 949 {
 950         struct pcpu *pcpu = pcpu_devices;
 951
 952         WARN_ON(!cpu_present(0) || !cpu_online(0));
 953         pcpu->state = CPU_STATE_CONFIGURED;
 954         pcpu->lowcore = (struct lowcore *)(unsigned long) store_prefix();
 955         S390_lowcore.percpu_offset = __per_cpu_offset[0];
 956         smp_cpu_set_polarization(0, POLARIZATION_UNKNOWN);
 957 }
 958
 959 void __init smp_cpus_done(unsigned int max_cpus)
 960 {
 961 }
 962
 963 void __init smp_setup_processor_id(void)
 964 {
 965         pcpu_devices[0].address = stap();
 966         S390_lowcore.cpu_nr = 0;
 967         S390_lowcore.spinlock_lockval = arch_spin_lockval(0);
 968 }
 969
 970 /*
 971  * the frequency of the profiling timer can be changed
 972  * by writing a multiplier value into /proc/profile.
 973  *
 974  * usually you want to run this on all CPUs ;)
 975  */
 976 int setup_profiling_timer(unsigned int multiplier)
 977 {
 978         return 0;
 979 }
 980
 981 #ifdef CONFIG_HOTPLUG_CPU
 982 static ssize_t cpu_configure_show(struct device *dev,
 983                                   struct device_attribute *attr, char *buf)
 984 {
 985         ssize_t count;
 986
 987         mutex_lock(&smp_cpu_state_mutex);
 988         count = sprintf(buf, "%d\n", pcpu_devices[dev->id].state);
 989         mutex_unlock(&smp_cpu_state_mutex);
 990         return count;
 991 }
 992
 993 static ssize_t cpu_configure_store(struct device *dev,
 994                                    struct device_attribute *attr,
 995                                    const char *buf, size_t count)
 996 {
 997         struct pcpu *pcpu;
 998         int cpu, val, rc, i;
 999         char delim;
1000
1001         if (sscanf(buf, "%d %c", &val, &delim) != 1)
1002                 return -EINVAL;
1003         if (val != 0 && val != 1)
1004                 return -EINVAL;
1005         get_online_cpus();
1006         mutex_lock(&smp_cpu_state_mutex);
1007         rc = -EBUSY;
1008         /* disallow configuration changes of online cpus and cpu 0 */
1009         cpu = dev->id;
1010         cpu = smp_get_base_cpu(cpu);
1011         if (cpu == 0)
1012                 goto out;
1013         for (i = 0; i <= smp_cpu_mtid; i++)
1014                 if (cpu_online(cpu + i))
1015                         goto out;
1016         pcpu = pcpu_devices + cpu;
1017         rc = 0;
1018         switch (val) {
1019         case 0:
1020                 if (pcpu->state != CPU_STATE_CONFIGURED)
1021                         break;
1022                 rc = sclp_core_deconfigure(pcpu->address >> smp_cpu_mt_shift);
1023                 if (rc)
1024                         break;
1025                 for (i = 0; i <= smp_cpu_mtid; i++) {
1026                         if (cpu + i >= nr_cpu_ids || !cpu_present(cpu + i))
1027                                 continue;
1028                         pcpu[i].state = CPU_STATE_STANDBY;
1029                         smp_cpu_set_polarization(cpu + i,
1030                                                  POLARIZATION_UNKNOWN);
1031                 }
1032                 topology_expect_change();
1033                 break;
1034         case 1:
1035                 if (pcpu->state != CPU_STATE_STANDBY)
1036                         break;
1037                 rc = sclp_core_configure(pcpu->address >> smp_cpu_mt_shift);
1038                 if (rc)
1039                         break;
1040                 for (i = 0; i <= smp_cpu_mtid; i++) {
1041                         if (cpu + i >= nr_cpu_ids || !cpu_present(cpu + i))
1042                                 continue;
1043                         pcpu[i].state = CPU_STATE_CONFIGURED;
1044                         smp_cpu_set_polarization(cpu + i,
1045                                                  POLARIZATION_UNKNOWN);
1046                 }
1047                 topology_expect_change();
1048                 break;
1049         default:
1050                 break;
1051         }
1052 out:
1053         mutex_unlock(&smp_cpu_state_mutex);
1054         put_online_cpus();
1055         return rc ? rc : count;
1056 }
1057 static DEVICE_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
1058 #endif /* CONFIG_HOTPLUG_CPU */
1059
1060 static ssize_t show_cpu_address(struct device *dev,
1061                                 struct device_attribute *attr, char *buf)
1062 {
1063         return sprintf(buf, "%d\n", pcpu_devices[dev->id].address);
1064 }
1065 static DEVICE_ATTR(address, 0444, show_cpu_address, NULL);
1066
1067 static struct attribute *cpu_common_attrs[] = {
1068 #ifdef CONFIG_HOTPLUG_CPU
1069         &dev_attr_configure.attr,
1070 #endif
1071         &dev_attr_address.attr,
1072         NULL,
1073 };
1074
1075 static struct attribute_group cpu_common_attr_group = {
1076         .attrs = cpu_common_attrs,
1077 };
1078
1079 static struct attribute *cpu_online_attrs[] = {
1080         &dev_attr_idle_count.attr,
1081         &dev_attr_idle_time_us.attr,
1082         NULL,
1083 };
1084
1085 static struct attribute_group cpu_online_attr_group = {
1086         .attrs = cpu_online_attrs,
1087 };
1088
1089 static int smp_cpu_online(unsigned int cpu)
1090 {
1091         struct device *s = &per_cpu(cpu_device, cpu)->dev;
1092
1093         return sysfs_create_group(&s->kobj, &cpu_online_attr_group);
1094 }
1095 static int smp_cpu_pre_down(unsigned int cpu)
1096 {
1097         struct device *s = &per_cpu(cpu_device, cpu)->dev;
1098
1099         sysfs_remove_group(&s->kobj, &cpu_online_attr_group);
1100         return 0;
1101 }
1102
1103 static int smp_add_present_cpu(int cpu)
1104 {
1105         struct device *s;
1106         struct cpu *c;
1107         int rc;
1108
1109         c = kzalloc(sizeof(*c), GFP_KERNEL);
1110         if (!c)
1111                 return -ENOMEM;
1112         per_cpu(cpu_device, cpu) = c;
1113         s = &c->dev;
1114         c->hotpluggable = 1;
1115         rc = register_cpu(c, cpu);
1116         if (rc)
1117                 goto out;
1118         rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group);
1119         if (rc)
1120                 goto out_cpu;
1121         rc = topology_cpu_init(c);
1122         if (rc)
1123                 goto out_topology;
1124         return 0;
1125
1126 out_topology:
1127         sysfs_remove_group(&s->kobj, &cpu_common_attr_group);
1128 out_cpu:
1129 #ifdef CONFIG_HOTPLUG_CPU
1130         unregister_cpu(c);
1131 #endif
1132 out:
1133         return rc;
1134 }
1135
1136 #ifdef CONFIG_HOTPLUG_CPU
1137
1138 int __ref smp_rescan_cpus(void)
1139 {
1140         struct sclp_core_info *info;
1141         int nr;
1142
1143         info = kzalloc(sizeof(*info), GFP_KERNEL);
1144         if (!info)
1145                 return -ENOMEM;
1146         smp_get_core_info(info, 0);
1147         get_online_cpus();
1148         mutex_lock(&smp_cpu_state_mutex);
1149         nr = __smp_rescan_cpus(info, 1);
1150         mutex_unlock(&smp_cpu_state_mutex);
1151         put_online_cpus();
1152         kfree(info);
1153         if (nr)
1154                 topology_schedule_update();
1155         return 0;
1156 }
1157
1158 static ssize_t __ref rescan_store(struct device *dev,
1159                                   struct device_attribute *attr,
1160                                   const char *buf,
1161                                   size_t count)
1162 {
1163         int rc;
1164
1165         rc = smp_rescan_cpus();
1166         return rc ? rc : count;
1167 }
1168 static DEVICE_ATTR(rescan, 0200, NULL, rescan_store);
1169 #endif /* CONFIG_HOTPLUG_CPU */
1170
1171 static int __init s390_smp_init(void)
1172 {
1173         int cpu, rc = 0;
1174
1175 #ifdef CONFIG_HOTPLUG_CPU
1176         rc = device_create_file(cpu_subsys.dev_root, &dev_attr_rescan);
1177         if (rc)
1178                 return rc;
1179 #endif
1180         for_each_present_cpu(cpu) {
1181                 rc = smp_add_present_cpu(cpu);
1182                 if (rc)
1183                         goto out;
1184         }
1185
1186         rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "s390/smp:online",
1187                                smp_cpu_online, smp_cpu_pre_down);
1188         rc = rc <= 0 ? rc : 0;
1189 out:
1190         return rc;
1191 }
1192 subsys_initcall(s390_smp_init);