kernel/arch/ia64/kernel/irq_ia64.c

   1 /*
   2  * linux/arch/ia64/kernel/irq_ia64.c
   3  *
   4  * Copyright (C) 1998-2001 Hewlett-Packard Co
   5  *      Stephane Eranian <eranian@hpl.hp.com>
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  *
   8  *  6/10/99: Updated to bring in sync with x86 version to facilitate
   9  *           support for SMP and different interrupt controllers.
  10  *
  11  * 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector
  12  *                      PCI to vector allocation routine.
  13  * 04/14/2004 Ashok Raj <ashok.raj@intel.com>
  14  *                                              Added CPU Hotplug handling for IPF.
  15  */
  16
  17 #include <linux/module.h>
  18
  19 #include <linux/jiffies.h>
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/ioport.h>
  24 #include <linux/kernel_stat.h>
  25 #include <linux/ptrace.h>
  26 #include <linux/signal.h>
  27 #include <linux/smp.h>
  28 #include <linux/threads.h>
  29 #include <linux/bitops.h>
  30 #include <linux/irq.h>
  31 #include <linux/ratelimit.h>
  32 #include <linux/acpi.h>
  33 #include <linux/sched.h>
  34
  35 #include <asm/delay.h>
  36 #include <asm/intrinsics.h>
  37 #include <asm/io.h>
  38 #include <asm/hw_irq.h>
  39 #include <asm/machvec.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/tlbflush.h>
  42
  43 #ifdef CONFIG_PERFMON
  44 # include <asm/perfmon.h>
  45 #endif
  46
  47 #define IRQ_DEBUG       0
  48
  49 #define IRQ_VECTOR_UNASSIGNED   (0)
  50
  51 #define IRQ_UNUSED              (0)
  52 #define IRQ_USED                (1)
  53 #define IRQ_RSVD                (2)
  54
  55 /* These can be overridden in platform_irq_init */
  56 int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR;
  57 int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR;
  58
  59 /* default base addr of IPI table */
  60 void __iomem *ipi_base_addr = ((void __iomem *)
  61                                (__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR));
  62
  63 static cpumask_t vector_allocation_domain(int cpu);
  64
  65 /*
  66  * Legacy IRQ to IA-64 vector translation table.
  67  */
  68 __u8 isa_irq_to_vector_map[16] = {
  69         /* 8259 IRQ translation, first 16 entries */
  70         0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29,
  71         0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21
  72 };
  73 EXPORT_SYMBOL(isa_irq_to_vector_map);
  74
  75 DEFINE_SPINLOCK(vector_lock);
  76
  77 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
  78         [0 ... NR_IRQS - 1] = {
  79                 .vector = IRQ_VECTOR_UNASSIGNED,
  80                 .domain = CPU_MASK_NONE
  81         }
  82 };
  83
  84 DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = {
  85         [0 ... IA64_NUM_VECTORS - 1] = -1
  86 };
  87
  88 static cpumask_t vector_table[IA64_NUM_VECTORS] = {
  89         [0 ... IA64_NUM_VECTORS - 1] = CPU_MASK_NONE
  90 };
  91
  92 static int irq_status[NR_IRQS] = {
  93         [0 ... NR_IRQS -1] = IRQ_UNUSED
  94 };
  95
  96 static inline int find_unassigned_irq(void)
  97 {
  98         int irq;
  99
 100         for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++)
 101                 if (irq_status[irq] == IRQ_UNUSED)
 102                         return irq;
 103         return -ENOSPC;
 104 }
 105
 106 static inline int find_unassigned_vector(cpumask_t domain)
 107 {
 108         cpumask_t mask;
 109         int pos, vector;
 110
 111         cpumask_and(&mask, &domain, cpu_online_mask);
 112         if (cpumask_empty(&mask))
 113                 return -EINVAL;
 114
 115         for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) {
 116                 vector = IA64_FIRST_DEVICE_VECTOR + pos;
 117                 cpumask_and(&mask, &domain, &vector_table[vector]);
 118                 if (!cpumask_empty(&mask))
 119                         continue;
 120                 return vector;
 121         }
 122         return -ENOSPC;
 123 }
 124
 125 static int __bind_irq_vector(int irq, int vector, cpumask_t domain)
 126 {
 127         cpumask_t mask;
 128         int cpu;
 129         struct irq_cfg *cfg = &irq_cfg[irq];
 130
 131         BUG_ON((unsigned)irq >= NR_IRQS);
 132         BUG_ON((unsigned)vector >= IA64_NUM_VECTORS);
 133
 134         cpumask_and(&mask, &domain, cpu_online_mask);
 135         if (cpumask_empty(&mask))
 136                 return -EINVAL;
 137         if ((cfg->vector == vector) && cpumask_equal(&cfg->domain, &domain))
 138                 return 0;
 139         if (cfg->vector != IRQ_VECTOR_UNASSIGNED)
 140                 return -EBUSY;
 141         for_each_cpu(cpu, &mask)
 142                 per_cpu(vector_irq, cpu)[vector] = irq;
 143         cfg->vector = vector;
 144         cfg->domain = domain;
 145         irq_status[irq] = IRQ_USED;
 146         cpumask_or(&vector_table[vector], &vector_table[vector], &domain);
 147         return 0;
 148 }
 149
 150 int bind_irq_vector(int irq, int vector, cpumask_t domain)
 151 {
 152         unsigned long flags;
 153         int ret;
 154
 155         spin_lock_irqsave(&vector_lock, flags);
 156         ret = __bind_irq_vector(irq, vector, domain);
 157         spin_unlock_irqrestore(&vector_lock, flags);
 158         return ret;
 159 }
 160
 161 static void __clear_irq_vector(int irq)
 162 {
 163         int vector, cpu;
 164         cpumask_t domain;
 165         struct irq_cfg *cfg = &irq_cfg[irq];
 166
 167         BUG_ON((unsigned)irq >= NR_IRQS);
 168         BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);
 169         vector = cfg->vector;
 170         domain = cfg->domain;
 171         for_each_cpu_and(cpu, &cfg->domain, cpu_online_mask)
 172                 per_cpu(vector_irq, cpu)[vector] = -1;
 173         cfg->vector = IRQ_VECTOR_UNASSIGNED;
 174         cfg->domain = CPU_MASK_NONE;
 175         irq_status[irq] = IRQ_UNUSED;
 176         cpumask_andnot(&vector_table[vector], &vector_table[vector], &domain);
 177 }
 178
 179 static void clear_irq_vector(int irq)
 180 {
 181         unsigned long flags;
 182
 183         spin_lock_irqsave(&vector_lock, flags);
 184         __clear_irq_vector(irq);
 185         spin_unlock_irqrestore(&vector_lock, flags);
 186 }
 187
 188 int
 189 ia64_native_assign_irq_vector (int irq)
 190 {
 191         unsigned long flags;
 192         int vector, cpu;
 193         cpumask_t domain = CPU_MASK_NONE;
 194
 195         vector = -ENOSPC;
 196
 197         spin_lock_irqsave(&vector_lock, flags);
 198         for_each_online_cpu(cpu) {
 199                 domain = vector_allocation_domain(cpu);
 200                 vector = find_unassigned_vector(domain);
 201                 if (vector >= 0)
 202                         break;
 203         }
 204         if (vector < 0)
 205                 goto out;
 206         if (irq == AUTO_ASSIGN)
 207                 irq = vector;
 208         BUG_ON(__bind_irq_vector(irq, vector, domain));
 209  out:
 210         spin_unlock_irqrestore(&vector_lock, flags);
 211         return vector;
 212 }
 213
 214 void
 215 ia64_native_free_irq_vector (int vector)
 216 {
 217         if (vector < IA64_FIRST_DEVICE_VECTOR ||
 218             vector > IA64_LAST_DEVICE_VECTOR)
 219                 return;
 220         clear_irq_vector(vector);
 221 }
 222
 223 int
 224 reserve_irq_vector (int vector)
 225 {
 226         if (vector < IA64_FIRST_DEVICE_VECTOR ||
 227             vector > IA64_LAST_DEVICE_VECTOR)
 228                 return -EINVAL;
 229         return !!bind_irq_vector(vector, vector, CPU_MASK_ALL);
 230 }
 231
 232 /*
 233  * Initialize vector_irq on a new cpu. This function must be called
 234  * with vector_lock held.
 235  */
 236 void __setup_vector_irq(int cpu)
 237 {
 238         int irq, vector;
 239
 240         /* Clear vector_irq */
 241         for (vector = 0; vector < IA64_NUM_VECTORS; ++vector)
 242                 per_cpu(vector_irq, cpu)[vector] = -1;
 243         /* Mark the inuse vectors */
 244         for (irq = 0; irq < NR_IRQS; ++irq) {
 245                 if (!cpumask_test_cpu(cpu, &irq_cfg[irq].domain))
 246                         continue;
 247                 vector = irq_to_vector(irq);
 248                 per_cpu(vector_irq, cpu)[vector] = irq;
 249         }
 250 }
 251
 252 #if defined(CONFIG_SMP) && (defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG))
 253
 254 static enum vector_domain_type {
 255         VECTOR_DOMAIN_NONE,
 256         VECTOR_DOMAIN_PERCPU
 257 } vector_domain_type = VECTOR_DOMAIN_NONE;
 258
 259 static cpumask_t vector_allocation_domain(int cpu)
 260 {
 261         if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
 262                 return *cpumask_of(cpu);
 263         return CPU_MASK_ALL;
 264 }
 265
 266 static int __irq_prepare_move(int irq, int cpu)
 267 {
 268         struct irq_cfg *cfg = &irq_cfg[irq];
 269         int vector;
 270         cpumask_t domain;
 271
 272         if (cfg->move_in_progress || cfg->move_cleanup_count)
 273                 return -EBUSY;
 274         if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
 275                 return -EINVAL;
 276         if (cpumask_test_cpu(cpu, &cfg->domain))
 277                 return 0;
 278         domain = vector_allocation_domain(cpu);
 279         vector = find_unassigned_vector(domain);
 280         if (vector < 0)
 281                 return -ENOSPC;
 282         cfg->move_in_progress = 1;
 283         cfg->old_domain = cfg->domain;
 284         cfg->vector = IRQ_VECTOR_UNASSIGNED;
 285         cfg->domain = CPU_MASK_NONE;
 286         BUG_ON(__bind_irq_vector(irq, vector, domain));
 287         return 0;
 288 }
 289
 290 int irq_prepare_move(int irq, int cpu)
 291 {
 292         unsigned long flags;
 293         int ret;
 294
 295         spin_lock_irqsave(&vector_lock, flags);
 296         ret = __irq_prepare_move(irq, cpu);
 297         spin_unlock_irqrestore(&vector_lock, flags);
 298         return ret;
 299 }
 300
 301 void irq_complete_move(unsigned irq)
 302 {
 303         struct irq_cfg *cfg = &irq_cfg[irq];
 304         cpumask_t cleanup_mask;
 305         int i;
 306
 307         if (likely(!cfg->move_in_progress))
 308                 return;
 309
 310         if (unlikely(cpumask_test_cpu(smp_processor_id(), &cfg->old_domain)))
 311                 return;
 312
 313         cpumask_and(&cleanup_mask, &cfg->old_domain, cpu_online_mask);
 314         cfg->move_cleanup_count = cpumask_weight(&cleanup_mask);
 315         for_each_cpu(i, &cleanup_mask)
 316                 platform_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0);
 317         cfg->move_in_progress = 0;
 318 }
 319
 320 static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id)
 321 {
 322         int me = smp_processor_id();
 323         ia64_vector vector;
 324         unsigned long flags;
 325
 326         for (vector = IA64_FIRST_DEVICE_VECTOR;
 327              vector < IA64_LAST_DEVICE_VECTOR; vector++) {
 328                 int irq;
 329                 struct irq_desc *desc;
 330                 struct irq_cfg *cfg;
 331                 irq = __this_cpu_read(vector_irq[vector]);
 332                 if (irq < 0)
 333                         continue;
 334
 335                 desc = irq_to_desc(irq);
 336                 cfg = irq_cfg + irq;
 337                 raw_spin_lock(&desc->lock);
 338                 if (!cfg->move_cleanup_count)
 339                         goto unlock;
 340
 341                 if (!cpumask_test_cpu(me, &cfg->old_domain))
 342                         goto unlock;
 343
 344                 spin_lock_irqsave(&vector_lock, flags);
 345                 __this_cpu_write(vector_irq[vector], -1);
 346                 cpumask_clear_cpu(me, &vector_table[vector]);
 347                 spin_unlock_irqrestore(&vector_lock, flags);
 348                 cfg->move_cleanup_count--;
 349         unlock:
 350                 raw_spin_unlock(&desc->lock);
 351         }
 352         return IRQ_HANDLED;
 353 }
 354
 355 static struct irqaction irq_move_irqaction = {
 356         .handler =      smp_irq_move_cleanup_interrupt,
 357         .name =         "irq_move"
 358 };
 359
 360 static int __init parse_vector_domain(char *arg)
 361 {
 362         if (!arg)
 363                 return -EINVAL;
 364         if (!strcmp(arg, "percpu")) {
 365                 vector_domain_type = VECTOR_DOMAIN_PERCPU;
 366                 no_int_routing = 1;
 367         }
 368         return 0;
 369 }
 370 early_param("vector", parse_vector_domain);
 371 #else
 372 static cpumask_t vector_allocation_domain(int cpu)
 373 {
 374         return CPU_MASK_ALL;
 375 }
 376 #endif
 377
 378
 379 void destroy_and_reserve_irq(unsigned int irq)
 380 {
 381         unsigned long flags;
 382
 383         irq_init_desc(irq);
 384         spin_lock_irqsave(&vector_lock, flags);
 385         __clear_irq_vector(irq);
 386         irq_status[irq] = IRQ_RSVD;
 387         spin_unlock_irqrestore(&vector_lock, flags);
 388 }
 389
 390 /*
 391  * Dynamic irq allocate and deallocation for MSI
 392  */
 393 int create_irq(void)
 394 {
 395         unsigned long flags;
 396         int irq, vector, cpu;
 397         cpumask_t domain = CPU_MASK_NONE;
 398
 399         irq = vector = -ENOSPC;
 400         spin_lock_irqsave(&vector_lock, flags);
 401         for_each_online_cpu(cpu) {
 402                 domain = vector_allocation_domain(cpu);
 403                 vector = find_unassigned_vector(domain);
 404                 if (vector >= 0)
 405                         break;
 406         }
 407         if (vector < 0)
 408                 goto out;
 409         irq = find_unassigned_irq();
 410         if (irq < 0)
 411                 goto out;
 412         BUG_ON(__bind_irq_vector(irq, vector, domain));
 413  out:
 414         spin_unlock_irqrestore(&vector_lock, flags);
 415         if (irq >= 0)
 416                 irq_init_desc(irq);
 417         return irq;
 418 }
 419
 420 void destroy_irq(unsigned int irq)
 421 {
 422         irq_init_desc(irq);
 423         clear_irq_vector(irq);
 424 }
 425
 426 #ifdef CONFIG_SMP
 427 #       define IS_RESCHEDULE(vec)       (vec == IA64_IPI_RESCHEDULE)
 428 #       define IS_LOCAL_TLB_FLUSH(vec)  (vec == IA64_IPI_LOCAL_TLB_FLUSH)
 429 #else
 430 #       define IS_RESCHEDULE(vec)       (0)
 431 #       define IS_LOCAL_TLB_FLUSH(vec)  (0)
 432 #endif
 433 /*
 434  * That's where the IVT branches when we get an external
 435  * interrupt. This branches to the correct hardware IRQ handler via
 436  * function ptr.
 437  */
 438 void
 439 ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
 440 {
 441         struct pt_regs *old_regs = set_irq_regs(regs);
 442         unsigned long saved_tpr;
 443
 444 #if IRQ_DEBUG
 445         {
 446                 unsigned long bsp, sp;
 447
 448                 /*
 449                  * Note: if the interrupt happened while executing in
 450                  * the context switch routine (ia64_switch_to), we may
 451                  * get a spurious stack overflow here.  This is
 452                  * because the register and the memory stack are not
 453                  * switched atomically.
 454                  */
 455                 bsp = ia64_getreg(_IA64_REG_AR_BSP);
 456                 sp = ia64_getreg(_IA64_REG_SP);
 457
 458                 if ((sp - bsp) < 1024) {
 459                         static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
 460
 461                         if (__ratelimit(&ratelimit)) {
 462                                 printk("ia64_handle_irq: DANGER: less than "
 463                                        "1KB of free stack space!!\n"
 464                                        "(bsp=0x%lx, sp=%lx)\n", bsp, sp);
 465                         }
 466                 }
 467         }
 468 #endif /* IRQ_DEBUG */
 469
 470         /*
 471          * Always set TPR to limit maximum interrupt nesting depth to
 472          * 16 (without this, it would be ~240, which could easily lead
 473          * to kernel stack overflows).
 474          */
 475         irq_enter();
 476         saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
 477         ia64_srlz_d();
 478         while (vector != IA64_SPURIOUS_INT_VECTOR) {
 479                 int irq = local_vector_to_irq(vector);
 480
 481                 if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
 482                         smp_local_flush_tlb();
 483                         kstat_incr_irq_this_cpu(irq);
 484                 } else if (unlikely(IS_RESCHEDULE(vector))) {
 485                         scheduler_ipi();
 486                         kstat_incr_irq_this_cpu(irq);
 487                 } else {
 488                         ia64_setreg(_IA64_REG_CR_TPR, vector);
 489                         ia64_srlz_d();
 490
 491                         if (unlikely(irq < 0)) {
 492                                 printk(KERN_ERR "%s: Unexpected interrupt "
 493                                        "vector %d on CPU %d is not mapped "
 494                                        "to any IRQ!\n", __func__, vector,
 495                                        smp_processor_id());
 496                         } else
 497                                 generic_handle_irq(irq);
 498
 499                         /*
 500                          * Disable interrupts and send EOI:
 501                          */
 502                         local_irq_disable();
 503                         ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
 504                 }
 505                 ia64_eoi();
 506                 vector = ia64_get_ivr();
 507         }
 508         /*
 509          * This must be done *after* the ia64_eoi().  For example, the keyboard softirq
 510          * handler needs to be able to wait for further keyboard interrupts, which can't
 511          * come through until ia64_eoi() has been done.
 512          */
 513         irq_exit();
 514         set_irq_regs(old_regs);
 515 }
 516
 517 #ifdef CONFIG_HOTPLUG_CPU
 518 /*
 519  * This function emulates a interrupt processing when a cpu is about to be
 520  * brought down.
 521  */
 522 void ia64_process_pending_intr(void)
 523 {
 524         ia64_vector vector;
 525         unsigned long saved_tpr;
 526         extern unsigned int vectors_in_migration[NR_IRQS];
 527
 528         vector = ia64_get_ivr();
 529
 530         irq_enter();
 531         saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
 532         ia64_srlz_d();
 533
 534          /*
 535           * Perform normal interrupt style processing
 536           */
 537         while (vector != IA64_SPURIOUS_INT_VECTOR) {
 538                 int irq = local_vector_to_irq(vector);
 539
 540                 if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
 541                         smp_local_flush_tlb();
 542                         kstat_incr_irq_this_cpu(irq);
 543                 } else if (unlikely(IS_RESCHEDULE(vector))) {
 544                         kstat_incr_irq_this_cpu(irq);
 545                 } else {
 546                         struct pt_regs *old_regs = set_irq_regs(NULL);
 547
 548                         ia64_setreg(_IA64_REG_CR_TPR, vector);
 549                         ia64_srlz_d();
 550
 551                         /*
 552                          * Now try calling normal ia64_handle_irq as it would have got called
 553                          * from a real intr handler. Try passing null for pt_regs, hopefully
 554                          * it will work. I hope it works!.
 555                          * Probably could shared code.
 556                          */
 557                         if (unlikely(irq < 0)) {
 558                                 printk(KERN_ERR "%s: Unexpected interrupt "
 559                                        "vector %d on CPU %d not being mapped "
 560                                        "to any IRQ!!\n", __func__, vector,
 561                                        smp_processor_id());
 562                         } else {
 563                                 vectors_in_migration[irq]=0;
 564                                 generic_handle_irq(irq);
 565                         }
 566                         set_irq_regs(old_regs);
 567
 568                         /*
 569                          * Disable interrupts and send EOI
 570                          */
 571                         local_irq_disable();
 572                         ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
 573                 }
 574                 ia64_eoi();
 575                 vector = ia64_get_ivr();
 576         }
 577         irq_exit();
 578 }
 579 #endif
 580
 581
 582 #ifdef CONFIG_SMP
 583
 584 static irqreturn_t dummy_handler (int irq, void *dev_id)
 585 {
 586         BUG();
 587 }
 588
 589 static struct irqaction ipi_irqaction = {
 590         .handler =      handle_IPI,
 591         .name =         "IPI"
 592 };
 593
 594 /*
 595  * KVM uses this interrupt to force a cpu out of guest mode
 596  */
 597 static struct irqaction resched_irqaction = {
 598         .handler =      dummy_handler,
 599         .name =         "resched"
 600 };
 601
 602 static struct irqaction tlb_irqaction = {
 603         .handler =      dummy_handler,
 604         .name =         "tlb_flush"
 605 };
 606
 607 #endif
 608
 609 void
 610 ia64_native_register_percpu_irq (ia64_vector vec, struct irqaction *action)
 611 {
 612         unsigned int irq;
 613
 614         irq = vec;
 615         BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL));
 616         irq_set_status_flags(irq, IRQ_PER_CPU);
 617         irq_set_chip(irq, &irq_type_ia64_lsapic);
 618         if (action)
 619                 setup_irq(irq, action);
 620         irq_set_handler(irq, handle_percpu_irq);
 621 }
 622
 623 void __init
 624 ia64_native_register_ipi(void)
 625 {
 626 #ifdef CONFIG_SMP
 627         register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
 628         register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
 629         register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction);
 630 #endif
 631 }
 632
 633 void __init
 634 init_IRQ (void)
 635 {
 636 #ifdef CONFIG_ACPI
 637         acpi_boot_init();
 638 #endif
 639         ia64_register_ipi();
 640         register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
 641 #ifdef CONFIG_SMP
 642 #if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG)
 643         if (vector_domain_type != VECTOR_DOMAIN_NONE)
 644                 register_percpu_irq(IA64_IRQ_MOVE_VECTOR, &irq_move_irqaction);
 645 #endif
 646 #endif
 647 #ifdef CONFIG_PERFMON
 648         pfm_init_percpu();
 649 #endif
 650         platform_irq_init();
 651 }
 652
 653 void
 654 ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect)
 655 {
 656         void __iomem *ipi_addr;
 657         unsigned long ipi_data;
 658         unsigned long phys_cpu_id;
 659
 660         phys_cpu_id = cpu_physical_id(cpu);
 661
 662         /*
 663          * cpu number is in 8bit ID and 8bit EID
 664          */
 665
 666         ipi_data = (delivery_mode << 8) | (vector & 0xff);
 667         ipi_addr = ipi_base_addr + ((phys_cpu_id << 4) | ((redirect & 1) << 3));
 668
 669         writeq(ipi_data, ipi_addr);
 670 }