arch/x86_64/kernel/io_apic.c

   1 /*
   2  *      Intel IO-APIC support for multi-Pentium hosts.
   3  *
   4  *      Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
   5  *
   6  *      Many thanks to Stig Venaas for trying out countless experimental
   7  *      patches and reporting/debugging problems patiently!
   8  *
   9  *      (c) 1999, Multiple IO-APIC support, developed by
  10  *      Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
  11  *      Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
  12  *      further tested and cleaned up by Zach Brown <zab@redhat.com>
  13  *      and Ingo Molnar <mingo@redhat.com>
  14  *
  15  *      Fixes
  16  *      Maciej W. Rozycki       :       Bits for genuine 82489DX APICs;
  17  *                                      thanks to Eric Gilmore
  18  *                                      and Rolf G. Tews
  19  *                                      for testing these extensively
  20  *      Paul Diefenbaugh        :       Added full ACPI support
  21  */
  22
  23 #include <linux/mm.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/sched.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/pci.h>
  30 #include <linux/mc146818rtc.h>
  31 #include <linux/acpi.h>
  32 #include <linux/sysdev.h>
  33 #include <linux/msi.h>
  34 #include <linux/htirq.h>
  35 #ifdef CONFIG_ACPI
  36 #include <acpi/acpi_bus.h>
  37 #endif
  38
  39 #include <asm/idle.h>
  40 #include <asm/io.h>
  41 #include <asm/smp.h>
  42 #include <asm/desc.h>
  43 #include <asm/proto.h>
  44 #include <asm/mach_apic.h>
  45 #include <asm/acpi.h>
  46 #include <asm/dma.h>
  47 #include <asm/nmi.h>
  48 #include <asm/msidef.h>
  49 #include <asm/hypertransport.h>
  50
  51 struct irq_cfg {
  52         cpumask_t domain;
  53         cpumask_t old_domain;
  54         unsigned move_cleanup_count;
  55         u8 vector;
  56         u8 move_in_progress : 1;
  57 };
  58
  59 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
  60 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
  61         [0]  = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR,  },
  62         [1]  = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR,  },
  63         [2]  = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR,  },
  64         [3]  = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR,  },
  65         [4]  = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR,  },
  66         [5]  = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR,  },
  67         [6]  = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR,  },
  68         [7]  = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR,  },
  69         [8]  = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR,  },
  70         [9]  = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR,  },
  71         [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
  72         [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
  73         [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
  74         [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
  75         [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
  76         [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
  77 };
  78
  79 static int assign_irq_vector(int irq, cpumask_t mask);
  80
  81 #define __apicdebuginit  __init
  82
  83 int sis_apic_bug; /* not actually supported, dummy for compile */
  84
  85 static int no_timer_check;
  86
  87 static int disable_timer_pin_1 __initdata;
  88
  89 int timer_over_8254 __initdata = 1;
  90
  91 /* Where if anywhere is the i8259 connect in external int mode */
  92 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
  93
  94 static DEFINE_SPINLOCK(ioapic_lock);
  95 DEFINE_SPINLOCK(vector_lock);
  96
  97 /*
  98  * # of IRQ routing registers
  99  */
 100 int nr_ioapic_registers[MAX_IO_APICS];
 101
 102 /*
 103  * Rough estimation of how many shared IRQs there are, can
 104  * be changed anytime.
 105  */
 106 #define MAX_PLUS_SHARED_IRQS NR_IRQS
 107 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
 108
 109 /*
 110  * This is performance-critical, we want to do it O(1)
 111  *
 112  * the indexing order of this array favors 1:1 mappings
 113  * between pins and IRQs.
 114  */
 115
 116 static struct irq_pin_list {
 117         short apic, pin, next;
 118 } irq_2_pin[PIN_MAP_SIZE];
 119
 120 struct io_apic {
 121         unsigned int index;
 122         unsigned int unused[3];
 123         unsigned int data;
 124 };
 125
 126 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
 127 {
 128         return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
 129                 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
 130 }
 131
 132 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
 133 {
 134         struct io_apic __iomem *io_apic = io_apic_base(apic);
 135         writel(reg, &io_apic->index);
 136         return readl(&io_apic->data);
 137 }
 138
 139 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
 140 {
 141         struct io_apic __iomem *io_apic = io_apic_base(apic);
 142         writel(reg, &io_apic->index);
 143         writel(value, &io_apic->data);
 144 }
 145
 146 /*
 147  * Re-write a value: to be used for read-modify-write
 148  * cycles where the read already set up the index register.
 149  */
 150 static inline void io_apic_modify(unsigned int apic, unsigned int value)
 151 {
 152         struct io_apic __iomem *io_apic = io_apic_base(apic);
 153         writel(value, &io_apic->data);
 154 }
 155
 156 /*
 157  * Synchronize the IO-APIC and the CPU by doing
 158  * a dummy read from the IO-APIC
 159  */
 160 static inline void io_apic_sync(unsigned int apic)
 161 {
 162         struct io_apic __iomem *io_apic = io_apic_base(apic);
 163         readl(&io_apic->data);
 164 }
 165
 166 #define __DO_ACTION(R, ACTION, FINAL)                                   \
 167                                                                         \
 168 {                                                                       \
 169         int pin;                                                        \
 170         struct irq_pin_list *entry = irq_2_pin + irq;                   \
 171                                                                         \
 172         BUG_ON(irq >= NR_IRQS);                                         \
 173         for (;;) {                                                      \
 174                 unsigned int reg;                                       \
 175                 pin = entry->pin;                                       \
 176                 if (pin == -1)                                          \
 177                         break;                                          \
 178                 reg = io_apic_read(entry->apic, 0x10 + R + pin*2);      \
 179                 reg ACTION;                                             \
 180                 io_apic_modify(entry->apic, reg);                       \
 181                 FINAL;                                                  \
 182                 if (!entry->next)                                       \
 183                         break;                                          \
 184                 entry = irq_2_pin + entry->next;                        \
 185         }                                                               \
 186 }
 187
 188 union entry_union {
 189         struct { u32 w1, w2; };
 190         struct IO_APIC_route_entry entry;
 191 };
 192
 193 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
 194 {
 195         union entry_union eu;
 196         unsigned long flags;
 197         spin_lock_irqsave(&ioapic_lock, flags);
 198         eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
 199         eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
 200         spin_unlock_irqrestore(&ioapic_lock, flags);
 201         return eu.entry;
 202 }
 203
 204 /*
 205  * When we write a new IO APIC routing entry, we need to write the high
 206  * word first! If the mask bit in the low word is clear, we will enable
 207  * the interrupt, and we need to make sure the entry is fully populated
 208  * before that happens.
 209  */
 210 static void
 211 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
 212 {
 213         union entry_union eu;
 214         eu.entry = e;
 215         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
 216         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
 217 }
 218
 219 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
 220 {
 221         unsigned long flags;
 222         spin_lock_irqsave(&ioapic_lock, flags);
 223         __ioapic_write_entry(apic, pin, e);
 224         spin_unlock_irqrestore(&ioapic_lock, flags);
 225 }
 226
 227 /*
 228  * When we mask an IO APIC routing entry, we need to write the low
 229  * word first, in order to set the mask bit before we change the
 230  * high bits!
 231  */
 232 static void ioapic_mask_entry(int apic, int pin)
 233 {
 234         unsigned long flags;
 235         union entry_union eu = { .entry.mask = 1 };
 236
 237         spin_lock_irqsave(&ioapic_lock, flags);
 238         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
 239         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
 240         spin_unlock_irqrestore(&ioapic_lock, flags);
 241 }
 242
 243 #ifdef CONFIG_SMP
 244 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
 245 {
 246         int apic, pin;
 247         struct irq_pin_list *entry = irq_2_pin + irq;
 248
 249         BUG_ON(irq >= NR_IRQS);
 250         for (;;) {
 251                 unsigned int reg;
 252                 apic = entry->apic;
 253                 pin = entry->pin;
 254                 if (pin == -1)
 255                         break;
 256                 io_apic_write(apic, 0x11 + pin*2, dest);
 257                 reg = io_apic_read(apic, 0x10 + pin*2);
 258                 reg &= ~0x000000ff;
 259                 reg |= vector;
 260                 io_apic_modify(apic, reg);
 261                 if (!entry->next)
 262                         break;
 263                 entry = irq_2_pin + entry->next;
 264         }
 265 }
 266
 267 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
 268 {
 269         struct irq_cfg *cfg = irq_cfg + irq;
 270         unsigned long flags;
 271         unsigned int dest;
 272         cpumask_t tmp;
 273
 274         cpus_and(tmp, mask, cpu_online_map);
 275         if (cpus_empty(tmp))
 276                 return;
 277
 278         if (assign_irq_vector(irq, mask))
 279                 return;
 280
 281         cpus_and(tmp, cfg->domain, mask);
 282         dest = cpu_mask_to_apicid(tmp);
 283
 284         /*
 285          * Only the high 8 bits are valid.
 286          */
 287         dest = SET_APIC_LOGICAL_ID(dest);
 288
 289         spin_lock_irqsave(&ioapic_lock, flags);
 290         __target_IO_APIC_irq(irq, dest, cfg->vector);
 291         irq_desc[irq].affinity = mask;
 292         spin_unlock_irqrestore(&ioapic_lock, flags);
 293 }
 294 #endif
 295
 296 /*
 297  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
 298  * shared ISA-space IRQs, so we have to support them. We are super
 299  * fast in the common case, and fast for shared ISA-space IRQs.
 300  */
 301 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
 302 {
 303         static int first_free_entry = NR_IRQS;
 304         struct irq_pin_list *entry = irq_2_pin + irq;
 305
 306         BUG_ON(irq >= NR_IRQS);
 307         while (entry->next)
 308                 entry = irq_2_pin + entry->next;
 309
 310         if (entry->pin != -1) {
 311                 entry->next = first_free_entry;
 312                 entry = irq_2_pin + entry->next;
 313                 if (++first_free_entry >= PIN_MAP_SIZE)
 314                         panic("io_apic.c: ran out of irq_2_pin entries!");
 315         }
 316         entry->apic = apic;
 317         entry->pin = pin;
 318 }
 319
 320
 321 #define DO_ACTION(name,R,ACTION, FINAL)                                 \
 322                                                                         \
 323         static void name##_IO_APIC_irq (unsigned int irq)               \
 324         __DO_ACTION(R, ACTION, FINAL)
 325
 326 DO_ACTION( __mask,             0, |= 0x00010000, io_apic_sync(entry->apic) )
 327                                                 /* mask = 1 */
 328 DO_ACTION( __unmask,           0, &= 0xfffeffff, )
 329                                                 /* mask = 0 */
 330
 331 static void mask_IO_APIC_irq (unsigned int irq)
 332 {
 333         unsigned long flags;
 334
 335         spin_lock_irqsave(&ioapic_lock, flags);
 336         __mask_IO_APIC_irq(irq);
 337         spin_unlock_irqrestore(&ioapic_lock, flags);
 338 }
 339
 340 static void unmask_IO_APIC_irq (unsigned int irq)
 341 {
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&ioapic_lock, flags);
 345         __unmask_IO_APIC_irq(irq);
 346         spin_unlock_irqrestore(&ioapic_lock, flags);
 347 }
 348
 349 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
 350 {
 351         struct IO_APIC_route_entry entry;
 352
 353         /* Check delivery_mode to be sure we're not clearing an SMI pin */
 354         entry = ioapic_read_entry(apic, pin);
 355         if (entry.delivery_mode == dest_SMI)
 356                 return;
 357         /*
 358          * Disable it in the IO-APIC irq-routing table:
 359          */
 360         ioapic_mask_entry(apic, pin);
 361 }
 362
 363 static void clear_IO_APIC (void)
 364 {
 365         int apic, pin;
 366
 367         for (apic = 0; apic < nr_ioapics; apic++)
 368                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
 369                         clear_IO_APIC_pin(apic, pin);
 370 }
 371
 372 int skip_ioapic_setup;
 373 int ioapic_force;
 374
 375 /* dummy parsing: see setup.c */
 376
 377 static int __init disable_ioapic_setup(char *str)
 378 {
 379         skip_ioapic_setup = 1;
 380         return 0;
 381 }
 382 early_param("noapic", disable_ioapic_setup);
 383
 384 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
 385 static int __init disable_timer_pin_setup(char *arg)
 386 {
 387         disable_timer_pin_1 = 1;
 388         return 1;
 389 }
 390 __setup("disable_timer_pin_1", disable_timer_pin_setup);
 391
 392 static int __init setup_disable_8254_timer(char *s)
 393 {
 394         timer_over_8254 = -1;
 395         return 1;
 396 }
 397 static int __init setup_enable_8254_timer(char *s)
 398 {
 399         timer_over_8254 = 2;
 400         return 1;
 401 }
 402
 403 __setup("disable_8254_timer", setup_disable_8254_timer);
 404 __setup("enable_8254_timer", setup_enable_8254_timer);
 405
 406
 407 /*
 408  * Find the IRQ entry number of a certain pin.
 409  */
 410 static int find_irq_entry(int apic, int pin, int type)
 411 {
 412         int i;
 413
 414         for (i = 0; i < mp_irq_entries; i++)
 415                 if (mp_irqs[i].mpc_irqtype == type &&
 416                     (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
 417                      mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
 418                     mp_irqs[i].mpc_dstirq == pin)
 419                         return i;
 420
 421         return -1;
 422 }
 423
 424 /*
 425  * Find the pin to which IRQ[irq] (ISA) is connected
 426  */
 427 static int __init find_isa_irq_pin(int irq, int type)
 428 {
 429         int i;
 430
 431         for (i = 0; i < mp_irq_entries; i++) {
 432                 int lbus = mp_irqs[i].mpc_srcbus;
 433
 434                 if (test_bit(lbus, mp_bus_not_pci) &&
 435                     (mp_irqs[i].mpc_irqtype == type) &&
 436                     (mp_irqs[i].mpc_srcbusirq == irq))
 437
 438                         return mp_irqs[i].mpc_dstirq;
 439         }
 440         return -1;
 441 }
 442
 443 static int __init find_isa_irq_apic(int irq, int type)
 444 {
 445         int i;
 446
 447         for (i = 0; i < mp_irq_entries; i++) {
 448                 int lbus = mp_irqs[i].mpc_srcbus;
 449
 450                 if (test_bit(lbus, mp_bus_not_pci) &&
 451                     (mp_irqs[i].mpc_irqtype == type) &&
 452                     (mp_irqs[i].mpc_srcbusirq == irq))
 453                         break;
 454         }
 455         if (i < mp_irq_entries) {
 456                 int apic;
 457                 for(apic = 0; apic < nr_ioapics; apic++) {
 458                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
 459                                 return apic;
 460                 }
 461         }
 462
 463         return -1;
 464 }
 465
 466 /*
 467  * Find a specific PCI IRQ entry.
 468  * Not an __init, possibly needed by modules
 469  */
 470 static int pin_2_irq(int idx, int apic, int pin);
 471
 472 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
 473 {
 474         int apic, i, best_guess = -1;
 475
 476         apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
 477                 bus, slot, pin);
 478         if (mp_bus_id_to_pci_bus[bus] == -1) {
 479                 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
 480                 return -1;
 481         }
 482         for (i = 0; i < mp_irq_entries; i++) {
 483                 int lbus = mp_irqs[i].mpc_srcbus;
 484
 485                 for (apic = 0; apic < nr_ioapics; apic++)
 486                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
 487                             mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
 488                                 break;
 489
 490                 if (!test_bit(lbus, mp_bus_not_pci) &&
 491                     !mp_irqs[i].mpc_irqtype &&
 492                     (bus == lbus) &&
 493                     (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
 494                         int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
 495
 496                         if (!(apic || IO_APIC_IRQ(irq)))
 497                                 continue;
 498
 499                         if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
 500                                 return irq;
 501                         /*
 502                          * Use the first all-but-pin matching entry as a
 503                          * best-guess fuzzy result for broken mptables.
 504                          */
 505                         if (best_guess < 0)
 506                                 best_guess = irq;
 507                 }
 508         }
 509         BUG_ON(best_guess >= NR_IRQS);
 510         return best_guess;
 511 }
 512
 513 /* ISA interrupts are always polarity zero edge triggered,
 514  * when listed as conforming in the MP table. */
 515
 516 #define default_ISA_trigger(idx)        (0)
 517 #define default_ISA_polarity(idx)       (0)
 518
 519 /* PCI interrupts are always polarity one level triggered,
 520  * when listed as conforming in the MP table. */
 521
 522 #define default_PCI_trigger(idx)        (1)
 523 #define default_PCI_polarity(idx)       (1)
 524
 525 static int __init MPBIOS_polarity(int idx)
 526 {
 527         int bus = mp_irqs[idx].mpc_srcbus;
 528         int polarity;
 529
 530         /*
 531          * Determine IRQ line polarity (high active or low active):
 532          */
 533         switch (mp_irqs[idx].mpc_irqflag & 3)
 534         {
 535                 case 0: /* conforms, ie. bus-type dependent polarity */
 536                         if (test_bit(bus, mp_bus_not_pci))
 537                                 polarity = default_ISA_polarity(idx);
 538                         else
 539                                 polarity = default_PCI_polarity(idx);
 540                         break;
 541                 case 1: /* high active */
 542                 {
 543                         polarity = 0;
 544                         break;
 545                 }
 546                 case 2: /* reserved */
 547                 {
 548                         printk(KERN_WARNING "broken BIOS!!\n");
 549                         polarity = 1;
 550                         break;
 551                 }
 552                 case 3: /* low active */
 553                 {
 554                         polarity = 1;
 555                         break;
 556                 }
 557                 default: /* invalid */
 558                 {
 559                         printk(KERN_WARNING "broken BIOS!!\n");
 560                         polarity = 1;
 561                         break;
 562                 }
 563         }
 564         return polarity;
 565 }
 566
 567 static int MPBIOS_trigger(int idx)
 568 {
 569         int bus = mp_irqs[idx].mpc_srcbus;
 570         int trigger;
 571
 572         /*
 573          * Determine IRQ trigger mode (edge or level sensitive):
 574          */
 575         switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
 576         {
 577                 case 0: /* conforms, ie. bus-type dependent */
 578                         if (test_bit(bus, mp_bus_not_pci))
 579                                 trigger = default_ISA_trigger(idx);
 580                         else
 581                                 trigger = default_PCI_trigger(idx);
 582                         break;
 583                 case 1: /* edge */
 584                 {
 585                         trigger = 0;
 586                         break;
 587                 }
 588                 case 2: /* reserved */
 589                 {
 590                         printk(KERN_WARNING "broken BIOS!!\n");
 591                         trigger = 1;
 592                         break;
 593                 }
 594                 case 3: /* level */
 595                 {
 596                         trigger = 1;
 597                         break;
 598                 }
 599                 default: /* invalid */
 600                 {
 601                         printk(KERN_WARNING "broken BIOS!!\n");
 602                         trigger = 0;
 603                         break;
 604                 }
 605         }
 606         return trigger;
 607 }
 608
 609 static inline int irq_polarity(int idx)
 610 {
 611         return MPBIOS_polarity(idx);
 612 }
 613
 614 static inline int irq_trigger(int idx)
 615 {
 616         return MPBIOS_trigger(idx);
 617 }
 618
 619 static int pin_2_irq(int idx, int apic, int pin)
 620 {
 621         int irq, i;
 622         int bus = mp_irqs[idx].mpc_srcbus;
 623
 624         /*
 625          * Debugging check, we are in big trouble if this message pops up!
 626          */
 627         if (mp_irqs[idx].mpc_dstirq != pin)
 628                 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
 629
 630         if (test_bit(bus, mp_bus_not_pci)) {
 631                 irq = mp_irqs[idx].mpc_srcbusirq;
 632         } else {
 633                 /*
 634                  * PCI IRQs are mapped in order
 635                  */
 636                 i = irq = 0;
 637                 while (i < apic)
 638                         irq += nr_ioapic_registers[i++];
 639                 irq += pin;
 640         }
 641         BUG_ON(irq >= NR_IRQS);
 642         return irq;
 643 }
 644
 645 static int __assign_irq_vector(int irq, cpumask_t mask)
 646 {
 647         /*
 648          * NOTE! The local APIC isn't very good at handling
 649          * multiple interrupts at the same interrupt level.
 650          * As the interrupt level is determined by taking the
 651          * vector number and shifting that right by 4, we
 652          * want to spread these out a bit so that they don't
 653          * all fall in the same interrupt level.
 654          *
 655          * Also, we've got to be careful not to trash gate
 656          * 0x80, because int 0x80 is hm, kind of importantish. ;)
 657          */
 658         static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
 659         unsigned int old_vector;
 660         int cpu;
 661         struct irq_cfg *cfg;
 662
 663         BUG_ON((unsigned)irq >= NR_IRQS);
 664         cfg = &irq_cfg[irq];
 665
 666         /* Only try and allocate irqs on cpus that are present */
 667         cpus_and(mask, mask, cpu_online_map);
 668
 669         if ((cfg->move_in_progress) || cfg->move_cleanup_count)
 670                 return -EBUSY;
 671
 672         old_vector = cfg->vector;
 673         if (old_vector) {
 674                 cpumask_t tmp;
 675                 cpus_and(tmp, cfg->domain, mask);
 676                 if (!cpus_empty(tmp))
 677                         return 0;
 678         }
 679
 680         for_each_cpu_mask(cpu, mask) {
 681                 cpumask_t domain, new_mask;
 682                 int new_cpu;
 683                 int vector, offset;
 684
 685                 domain = vector_allocation_domain(cpu);
 686                 cpus_and(new_mask, domain, cpu_online_map);
 687
 688                 vector = current_vector;
 689                 offset = current_offset;
 690 next:
 691                 vector += 8;
 692                 if (vector >= FIRST_SYSTEM_VECTOR) {
 693                         /* If we run out of vectors on large boxen, must share them. */
 694                         offset = (offset + 1) % 8;
 695                         vector = FIRST_DEVICE_VECTOR + offset;
 696                 }
 697                 if (unlikely(current_vector == vector))
 698                         continue;
 699                 if (vector == IA32_SYSCALL_VECTOR)
 700                         goto next;
 701                 for_each_cpu_mask(new_cpu, new_mask)
 702                         if (per_cpu(vector_irq, new_cpu)[vector] != -1)
 703                                 goto next;
 704                 /* Found one! */
 705                 current_vector = vector;
 706                 current_offset = offset;
 707                 if (old_vector) {
 708                         cfg->move_in_progress = 1;
 709                         cfg->old_domain = cfg->domain;
 710                 }
 711                 for_each_cpu_mask(new_cpu, new_mask)
 712                         per_cpu(vector_irq, new_cpu)[vector] = irq;
 713                 cfg->vector = vector;
 714                 cfg->domain = domain;
 715                 return 0;
 716         }
 717         return -ENOSPC;
 718 }
 719
 720 static int assign_irq_vector(int irq, cpumask_t mask)
 721 {
 722         int err;
 723         unsigned long flags;
 724
 725         spin_lock_irqsave(&vector_lock, flags);
 726         err = __assign_irq_vector(irq, mask);
 727         spin_unlock_irqrestore(&vector_lock, flags);
 728         return err;
 729 }
 730
 731 static void __clear_irq_vector(int irq)
 732 {
 733         struct irq_cfg *cfg;
 734         cpumask_t mask;
 735         int cpu, vector;
 736
 737         BUG_ON((unsigned)irq >= NR_IRQS);
 738         cfg = &irq_cfg[irq];
 739         BUG_ON(!cfg->vector);
 740
 741         vector = cfg->vector;
 742         cpus_and(mask, cfg->domain, cpu_online_map);
 743         for_each_cpu_mask(cpu, mask)
 744                 per_cpu(vector_irq, cpu)[vector] = -1;
 745
 746         cfg->vector = 0;
 747         cfg->domain = CPU_MASK_NONE;
 748 }
 749
 750 void __setup_vector_irq(int cpu)
 751 {
 752         /* Initialize vector_irq on a new cpu */
 753         /* This function must be called with vector_lock held */
 754         int irq, vector;
 755
 756         /* Mark the inuse vectors */
 757         for (irq = 0; irq < NR_IRQS; ++irq) {
 758                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
 759                         continue;
 760                 vector = irq_cfg[irq].vector;
 761                 per_cpu(vector_irq, cpu)[vector] = irq;
 762         }
 763         /* Mark the free vectors */
 764         for (vector = 0; vector < NR_VECTORS; ++vector) {
 765                 irq = per_cpu(vector_irq, cpu)[vector];
 766                 if (irq < 0)
 767                         continue;
 768                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
 769                         per_cpu(vector_irq, cpu)[vector] = -1;
 770         }
 771 }
 772
 773
 774 static struct irq_chip ioapic_chip;
 775
 776 static void ioapic_register_intr(int irq, unsigned long trigger)
 777 {
 778         if (trigger)
 779                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
 780                                               handle_fasteoi_irq, "fasteoi");
 781         else
 782                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
 783                                               handle_edge_irq, "edge");
 784 }
 785
 786 static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
 787                               int trigger, int polarity)
 788 {
 789         struct irq_cfg *cfg = irq_cfg + irq;
 790         struct IO_APIC_route_entry entry;
 791         cpumask_t mask;
 792
 793         if (!IO_APIC_IRQ(irq))
 794                 return;
 795
 796         mask = TARGET_CPUS;
 797         if (assign_irq_vector(irq, mask))
 798                 return;
 799
 800         cpus_and(mask, cfg->domain, mask);
 801
 802         apic_printk(APIC_VERBOSE,KERN_DEBUG
 803                     "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
 804                     "IRQ %d Mode:%i Active:%i)\n",
 805                     apic, mp_ioapics[apic].mpc_apicid, pin, cfg->vector,
 806                     irq, trigger, polarity);
 807
 808         /*
 809          * add it to the IO-APIC irq-routing table:
 810          */
 811         memset(&entry,0,sizeof(entry));
 812
 813         entry.delivery_mode = INT_DELIVERY_MODE;
 814         entry.dest_mode = INT_DEST_MODE;
 815         entry.dest = cpu_mask_to_apicid(mask);
 816         entry.mask = 0;                         /* enable IRQ */
 817         entry.trigger = trigger;
 818         entry.polarity = polarity;
 819         entry.vector = cfg->vector;
 820
 821         /* Mask level triggered irqs.
 822          * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
 823          */
 824         if (trigger)
 825                 entry.mask = 1;
 826
 827         ioapic_register_intr(irq, trigger);
 828         if (irq < 16)
 829                 disable_8259A_irq(irq);
 830
 831         ioapic_write_entry(apic, pin, entry);
 832 }
 833
 834 static void __init setup_IO_APIC_irqs(void)
 835 {
 836         int apic, pin, idx, irq, first_notcon = 1;
 837
 838         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
 839
 840         for (apic = 0; apic < nr_ioapics; apic++) {
 841         for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
 842
 843                 idx = find_irq_entry(apic,pin,mp_INT);
 844                 if (idx == -1) {
 845                         if (first_notcon) {
 846                                 apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
 847                                 first_notcon = 0;
 848                         } else
 849                                 apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
 850                         continue;
 851                 }
 852
 853                 irq = pin_2_irq(idx, apic, pin);
 854                 add_pin_to_irq(irq, apic, pin);
 855
 856                 setup_IO_APIC_irq(apic, pin, irq,
 857                                   irq_trigger(idx), irq_polarity(idx));
 858         }
 859         }
 860
 861         if (!first_notcon)
 862                 apic_printk(APIC_VERBOSE," not connected.\n");
 863 }
 864
 865 /*
 866  * Set up the 8259A-master output pin as broadcast to all
 867  * CPUs.
 868  */
 869 static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
 870 {
 871         struct IO_APIC_route_entry entry;
 872         unsigned long flags;
 873
 874         memset(&entry,0,sizeof(entry));
 875
 876         disable_8259A_irq(0);
 877
 878         /* mask LVT0 */
 879         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
 880
 881         /*
 882          * We use logical delivery to get the timer IRQ
 883          * to the first CPU.
 884          */
 885         entry.dest_mode = INT_DEST_MODE;
 886         entry.mask = 0;                                 /* unmask IRQ now */
 887         entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
 888         entry.delivery_mode = INT_DELIVERY_MODE;
 889         entry.polarity = 0;
 890         entry.trigger = 0;
 891         entry.vector = vector;
 892
 893         /*
 894          * The timer IRQ doesn't have to know that behind the
 895          * scene we have a 8259A-master in AEOI mode ...
 896          */
 897         set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
 898
 899         /*
 900          * Add it to the IO-APIC irq-routing table:
 901          */
 902         spin_lock_irqsave(&ioapic_lock, flags);
 903         io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
 904         io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
 905         spin_unlock_irqrestore(&ioapic_lock, flags);
 906
 907         enable_8259A_irq(0);
 908 }
 909
 910 void __init UNEXPECTED_IO_APIC(void)
 911 {
 912 }
 913
 914 void __apicdebuginit print_IO_APIC(void)
 915 {
 916         int apic, i;
 917         union IO_APIC_reg_00 reg_00;
 918         union IO_APIC_reg_01 reg_01;
 919         union IO_APIC_reg_02 reg_02;
 920         unsigned long flags;
 921
 922         if (apic_verbosity == APIC_QUIET)
 923                 return;
 924
 925         printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
 926         for (i = 0; i < nr_ioapics; i++)
 927                 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
 928                        mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
 929
 930         /*
 931          * We are a bit conservative about what we expect.  We have to
 932          * know about every hardware change ASAP.
 933          */
 934         printk(KERN_INFO "testing the IO APIC.......................\n");
 935
 936         for (apic = 0; apic < nr_ioapics; apic++) {
 937
 938         spin_lock_irqsave(&ioapic_lock, flags);
 939         reg_00.raw = io_apic_read(apic, 0);
 940         reg_01.raw = io_apic_read(apic, 1);
 941         if (reg_01.bits.version >= 0x10)
 942                 reg_02.raw = io_apic_read(apic, 2);
 943         spin_unlock_irqrestore(&ioapic_lock, flags);
 944
 945         printk("\n");
 946         printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
 947         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
 948         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
 949         if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
 950                 UNEXPECTED_IO_APIC();
 951
 952         printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
 953         printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);
 954         if (    (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
 955                 (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
 956                 (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
 957                 (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
 958                 (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
 959                 (reg_01.bits.entries != 0x2E) &&
 960                 (reg_01.bits.entries != 0x3F) &&
 961                 (reg_01.bits.entries != 0x03)
 962         )
 963                 UNEXPECTED_IO_APIC();
 964
 965         printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
 966         printk(KERN_DEBUG ".......     : IO APIC version: %04X\n", reg_01.bits.version);
 967         if (    (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
 968                 (reg_01.bits.version != 0x02) && /* 82801BA IO-APICs (ICH2) */
 969                 (reg_01.bits.version != 0x10) && /* oldest IO-APICs */
 970                 (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
 971                 (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
 972                 (reg_01.bits.version != 0x20)    /* Intel P64H (82806 AA) */
 973         )
 974                 UNEXPECTED_IO_APIC();
 975         if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
 976                 UNEXPECTED_IO_APIC();
 977
 978         if (reg_01.bits.version >= 0x10) {
 979                 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
 980                 printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
 981                 if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
 982                         UNEXPECTED_IO_APIC();
 983         }
 984
 985         printk(KERN_DEBUG ".... IRQ redirection table:\n");
 986
 987         printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
 988                           " Stat Dmod Deli Vect:   \n");
 989
 990         for (i = 0; i <= reg_01.bits.entries; i++) {
 991                 struct IO_APIC_route_entry entry;
 992
 993                 entry = ioapic_read_entry(apic, i);
 994
 995                 printk(KERN_DEBUG " %02x %03X ",
 996                         i,
 997                         entry.dest
 998                 );
 999
1000                 printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
1001                         entry.mask,
1002                         entry.trigger,
1003                         entry.irr,
1004                         entry.polarity,
1005                         entry.delivery_status,
1006                         entry.dest_mode,
1007                         entry.delivery_mode,
1008                         entry.vector
1009                 );
1010         }
1011         }
1012         printk(KERN_DEBUG "IRQ to pin mappings:\n");
1013         for (i = 0; i < NR_IRQS; i++) {
1014                 struct irq_pin_list *entry = irq_2_pin + i;
1015                 if (entry->pin < 0)
1016                         continue;
1017                 printk(KERN_DEBUG "IRQ%d ", i);
1018                 for (;;) {
1019                         printk("-> %d:%d", entry->apic, entry->pin);
1020                         if (!entry->next)
1021                                 break;
1022                         entry = irq_2_pin + entry->next;
1023                 }
1024                 printk("\n");
1025         }
1026
1027         printk(KERN_INFO ".................................... done.\n");
1028
1029         return;
1030 }
1031
1032 #if 0
1033
1034 static __apicdebuginit void print_APIC_bitfield (int base)
1035 {
1036         unsigned int v;
1037         int i, j;
1038
1039         if (apic_verbosity == APIC_QUIET)
1040                 return;
1041
1042         printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1043         for (i = 0; i < 8; i++) {
1044                 v = apic_read(base + i*0x10);
1045                 for (j = 0; j < 32; j++) {
1046                         if (v & (1<<j))
1047                                 printk("1");
1048                         else
1049                                 printk("0");
1050                 }
1051                 printk("\n");
1052         }
1053 }
1054
1055 void __apicdebuginit print_local_APIC(void * dummy)
1056 {
1057         unsigned int v, ver, maxlvt;
1058
1059         if (apic_verbosity == APIC_QUIET)
1060                 return;
1061
1062         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1063                 smp_processor_id(), hard_smp_processor_id());
1064         v = apic_read(APIC_ID);
1065         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(v));
1066         v = apic_read(APIC_LVR);
1067         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1068         ver = GET_APIC_VERSION(v);
1069         maxlvt = get_maxlvt();
1070
1071         v = apic_read(APIC_TASKPRI);
1072         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1073
1074         v = apic_read(APIC_ARBPRI);
1075         printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1076                 v & APIC_ARBPRI_MASK);
1077         v = apic_read(APIC_PROCPRI);
1078         printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1079
1080         v = apic_read(APIC_EOI);
1081         printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1082         v = apic_read(APIC_RRR);
1083         printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1084         v = apic_read(APIC_LDR);
1085         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1086         v = apic_read(APIC_DFR);
1087         printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1088         v = apic_read(APIC_SPIV);
1089         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1090
1091         printk(KERN_DEBUG "... APIC ISR field:\n");
1092         print_APIC_bitfield(APIC_ISR);
1093         printk(KERN_DEBUG "... APIC TMR field:\n");
1094         print_APIC_bitfield(APIC_TMR);
1095         printk(KERN_DEBUG "... APIC IRR field:\n");
1096         print_APIC_bitfield(APIC_IRR);
1097
1098         v = apic_read(APIC_ESR);
1099         printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1100
1101         v = apic_read(APIC_ICR);
1102         printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1103         v = apic_read(APIC_ICR2);
1104         printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1105
1106         v = apic_read(APIC_LVTT);
1107         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1108
1109         if (maxlvt > 3) {                       /* PC is LVT#4. */
1110                 v = apic_read(APIC_LVTPC);
1111                 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1112         }
1113         v = apic_read(APIC_LVT0);
1114         printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1115         v = apic_read(APIC_LVT1);
1116         printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1117
1118         if (maxlvt > 2) {                       /* ERR is LVT#3. */
1119                 v = apic_read(APIC_LVTERR);
1120                 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1121         }
1122
1123         v = apic_read(APIC_TMICT);
1124         printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1125         v = apic_read(APIC_TMCCT);
1126         printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1127         v = apic_read(APIC_TDCR);
1128         printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1129         printk("\n");
1130 }
1131
1132 void print_all_local_APICs (void)
1133 {
1134         on_each_cpu(print_local_APIC, NULL, 1, 1);
1135 }
1136
1137 void __apicdebuginit print_PIC(void)
1138 {
1139         unsigned int v;
1140         unsigned long flags;
1141
1142         if (apic_verbosity == APIC_QUIET)
1143                 return;
1144
1145         printk(KERN_DEBUG "\nprinting PIC contents\n");
1146
1147         spin_lock_irqsave(&i8259A_lock, flags);
1148
1149         v = inb(0xa1) << 8 | inb(0x21);
1150         printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
1151
1152         v = inb(0xa0) << 8 | inb(0x20);
1153         printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
1154
1155         outb(0x0b,0xa0);
1156         outb(0x0b,0x20);
1157         v = inb(0xa0) << 8 | inb(0x20);
1158         outb(0x0a,0xa0);
1159         outb(0x0a,0x20);
1160
1161         spin_unlock_irqrestore(&i8259A_lock, flags);
1162
1163         printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
1164
1165         v = inb(0x4d1) << 8 | inb(0x4d0);
1166         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1167 }
1168
1169 #endif  /*  0  */
1170
1171 static void __init enable_IO_APIC(void)
1172 {
1173         union IO_APIC_reg_01 reg_01;
1174         int i8259_apic, i8259_pin;
1175         int i, apic;
1176         unsigned long flags;
1177
1178         for (i = 0; i < PIN_MAP_SIZE; i++) {
1179                 irq_2_pin[i].pin = -1;
1180                 irq_2_pin[i].next = 0;
1181         }
1182
1183         /*
1184          * The number of IO-APIC IRQ registers (== #pins):
1185          */
1186         for (apic = 0; apic < nr_ioapics; apic++) {
1187                 spin_lock_irqsave(&ioapic_lock, flags);
1188                 reg_01.raw = io_apic_read(apic, 1);
1189                 spin_unlock_irqrestore(&ioapic_lock, flags);
1190                 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1191         }
1192         for(apic = 0; apic < nr_ioapics; apic++) {
1193                 int pin;
1194                 /* See if any of the pins is in ExtINT mode */
1195                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1196                         struct IO_APIC_route_entry entry;
1197                         entry = ioapic_read_entry(apic, pin);
1198
1199                         /* If the interrupt line is enabled and in ExtInt mode
1200                          * I have found the pin where the i8259 is connected.
1201                          */
1202                         if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1203                                 ioapic_i8259.apic = apic;
1204                                 ioapic_i8259.pin  = pin;
1205                                 goto found_i8259;
1206                         }
1207                 }
1208         }
1209  found_i8259:
1210         /* Look to see what if the MP table has reported the ExtINT */
1211         i8259_pin  = find_isa_irq_pin(0, mp_ExtINT);
1212         i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1213         /* Trust the MP table if nothing is setup in the hardware */
1214         if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1215                 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1216                 ioapic_i8259.pin  = i8259_pin;
1217                 ioapic_i8259.apic = i8259_apic;
1218         }
1219         /* Complain if the MP table and the hardware disagree */
1220         if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1221                 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1222         {
1223                 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1224         }
1225
1226         /*
1227          * Do not trust the IO-APIC being empty at bootup
1228          */
1229         clear_IO_APIC();
1230 }
1231
1232 /*
1233  * Not an __init, needed by the reboot code
1234  */
1235 void disable_IO_APIC(void)
1236 {
1237         /*
1238          * Clear the IO-APIC before rebooting:
1239          */
1240         clear_IO_APIC();
1241
1242         /*
1243          * If the i8259 is routed through an IOAPIC
1244          * Put that IOAPIC in virtual wire mode
1245          * so legacy interrupts can be delivered.
1246          */
1247         if (ioapic_i8259.pin != -1) {
1248                 struct IO_APIC_route_entry entry;
1249
1250                 memset(&entry, 0, sizeof(entry));
1251                 entry.mask            = 0; /* Enabled */
1252                 entry.trigger         = 0; /* Edge */
1253                 entry.irr             = 0;
1254                 entry.polarity        = 0; /* High */
1255                 entry.delivery_status = 0;
1256                 entry.dest_mode       = 0; /* Physical */
1257                 entry.delivery_mode   = dest_ExtINT; /* ExtInt */
1258                 entry.vector          = 0;
1259                 entry.dest          = GET_APIC_ID(apic_read(APIC_ID));
1260
1261                 /*
1262                  * Add it to the IO-APIC irq-routing table:
1263                  */
1264                 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1265         }
1266
1267         disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1268 }
1269
1270 /*
1271  * There is a nasty bug in some older SMP boards, their mptable lies
1272  * about the timer IRQ. We do the following to work around the situation:
1273  *
1274  *      - timer IRQ defaults to IO-APIC IRQ
1275  *      - if this function detects that timer IRQs are defunct, then we fall
1276  *        back to ISA timer IRQs
1277  */
1278 static int __init timer_irq_works(void)
1279 {
1280         unsigned long t1 = jiffies;
1281
1282         local_irq_enable();
1283         /* Let ten ticks pass... */
1284         mdelay((10 * 1000) / HZ);
1285
1286         /*
1287          * Expect a few ticks at least, to be sure some possible
1288          * glue logic does not lock up after one or two first
1289          * ticks in a non-ExtINT mode.  Also the local APIC
1290          * might have cached one ExtINT interrupt.  Finally, at
1291          * least one tick may be lost due to delays.
1292          */
1293
1294         /* jiffies wrap? */
1295         if (jiffies - t1 > 4)
1296                 return 1;
1297         return 0;
1298 }
1299
1300 /*
1301  * In the SMP+IOAPIC case it might happen that there are an unspecified
1302  * number of pending IRQ events unhandled. These cases are very rare,
1303  * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1304  * better to do it this way as thus we do not have to be aware of
1305  * 'pending' interrupts in the IRQ path, except at this point.
1306  */
1307 /*
1308  * Edge triggered needs to resend any interrupt
1309  * that was delayed but this is now handled in the device
1310  * independent code.
1311  */
1312
1313 /*
1314  * Starting up a edge-triggered IO-APIC interrupt is
1315  * nasty - we need to make sure that we get the edge.
1316  * If it is already asserted for some reason, we need
1317  * return 1 to indicate that is was pending.
1318  *
1319  * This is not complete - we should be able to fake
1320  * an edge even if it isn't on the 8259A...
1321  */
1322
1323 static unsigned int startup_ioapic_irq(unsigned int irq)
1324 {
1325         int was_pending = 0;
1326         unsigned long flags;
1327
1328         spin_lock_irqsave(&ioapic_lock, flags);
1329         if (irq < 16) {
1330                 disable_8259A_irq(irq);
1331                 if (i8259A_irq_pending(irq))
1332                         was_pending = 1;
1333         }
1334         __unmask_IO_APIC_irq(irq);
1335         spin_unlock_irqrestore(&ioapic_lock, flags);
1336
1337         return was_pending;
1338 }
1339
1340 static int ioapic_retrigger_irq(unsigned int irq)
1341 {
1342         struct irq_cfg *cfg = &irq_cfg[irq];
1343         cpumask_t mask;
1344         unsigned long flags;
1345
1346         spin_lock_irqsave(&vector_lock, flags);
1347         cpus_clear(mask);
1348         cpu_set(first_cpu(cfg->domain), mask);
1349
1350         send_IPI_mask(mask, cfg->vector);
1351         spin_unlock_irqrestore(&vector_lock, flags);
1352
1353         return 1;
1354 }
1355
1356 /*
1357  * Level and edge triggered IO-APIC interrupts need different handling,
1358  * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1359  * handled with the level-triggered descriptor, but that one has slightly
1360  * more overhead. Level-triggered interrupts cannot be handled with the
1361  * edge-triggered handler, without risking IRQ storms and other ugly
1362  * races.
1363  */
1364
1365 #ifdef CONFIG_SMP
1366 asmlinkage void smp_irq_move_cleanup_interrupt(void)
1367 {
1368         unsigned vector, me;
1369         ack_APIC_irq();
1370         exit_idle();
1371         irq_enter();
1372
1373         me = smp_processor_id();
1374         for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
1375                 unsigned int irq;
1376                 struct irq_desc *desc;
1377                 struct irq_cfg *cfg;
1378                 irq = __get_cpu_var(vector_irq)[vector];
1379                 if (irq >= NR_IRQS)
1380                         continue;
1381
1382                 desc = irq_desc + irq;
1383                 cfg = irq_cfg + irq;
1384                 spin_lock(&desc->lock);
1385                 if (!cfg->move_cleanup_count)
1386                         goto unlock;
1387
1388                 if ((vector == cfg->vector) && cpu_isset(me, cfg->domain))
1389                         goto unlock;
1390
1391                 __get_cpu_var(vector_irq)[vector] = -1;
1392                 cfg->move_cleanup_count--;
1393 unlock:
1394                 spin_unlock(&desc->lock);
1395         }
1396
1397         irq_exit();
1398 }
1399
1400 static void irq_complete_move(unsigned int irq)
1401 {
1402         struct irq_cfg *cfg = irq_cfg + irq;
1403         unsigned vector, me;
1404
1405         if (likely(!cfg->move_in_progress))
1406                 return;
1407
1408         vector = ~get_irq_regs()->orig_rax;
1409         me = smp_processor_id();
1410         if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) {
1411                 cpumask_t cleanup_mask;
1412
1413                 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
1414                 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
1415                 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
1416                 cfg->move_in_progress = 0;
1417         }
1418 }
1419 #else
1420 static inline void irq_complete_move(unsigned int irq) {}
1421 #endif
1422
1423 static void ack_apic_edge(unsigned int irq)
1424 {
1425         irq_complete_move(irq);
1426         move_native_irq(irq);
1427         ack_APIC_irq();
1428 }
1429
1430 static void ack_apic_level(unsigned int irq)
1431 {
1432         int do_unmask_irq = 0;
1433
1434         irq_complete_move(irq);
1435 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
1436         /* If we are moving the irq we need to mask it */
1437         if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
1438                 do_unmask_irq = 1;
1439                 mask_IO_APIC_irq(irq);
1440         }
1441 #endif
1442
1443         /*
1444          * We must acknowledge the irq before we move it or the acknowledge will
1445          * not propogate properly.
1446          */
1447         ack_APIC_irq();
1448
1449         /* Now we can move and renable the irq */
1450         move_masked_irq(irq);
1451         if (unlikely(do_unmask_irq))
1452                 unmask_IO_APIC_irq(irq);
1453 }
1454
1455 static struct irq_chip ioapic_chip __read_mostly = {
1456         .name           = "IO-APIC",
1457         .startup        = startup_ioapic_irq,
1458         .mask           = mask_IO_APIC_irq,
1459         .unmask         = unmask_IO_APIC_irq,
1460         .ack            = ack_apic_edge,
1461         .eoi            = ack_apic_level,
1462 #ifdef CONFIG_SMP
1463         .set_affinity   = set_ioapic_affinity_irq,
1464 #endif
1465         .retrigger      = ioapic_retrigger_irq,
1466 };
1467
1468 static inline void init_IO_APIC_traps(void)
1469 {
1470         int irq;
1471
1472         /*
1473          * NOTE! The local APIC isn't very good at handling
1474          * multiple interrupts at the same interrupt level.
1475          * As the interrupt level is determined by taking the
1476          * vector number and shifting that right by 4, we
1477          * want to spread these out a bit so that they don't
1478          * all fall in the same interrupt level.
1479          *
1480          * Also, we've got to be careful not to trash gate
1481          * 0x80, because int 0x80 is hm, kind of importantish. ;)
1482          */
1483         for (irq = 0; irq < NR_IRQS ; irq++) {
1484                 int tmp = irq;
1485                 if (IO_APIC_IRQ(tmp) && !irq_cfg[tmp].vector) {
1486                         /*
1487                          * Hmm.. We don't have an entry for this,
1488                          * so default to an old-fashioned 8259
1489                          * interrupt if we can..
1490                          */
1491                         if (irq < 16)
1492                                 make_8259A_irq(irq);
1493                         else
1494                                 /* Strange. Oh, well.. */
1495                                 irq_desc[irq].chip = &no_irq_chip;
1496                 }
1497         }
1498 }
1499
1500 static void enable_lapic_irq (unsigned int irq)
1501 {
1502         unsigned long v;
1503
1504         v = apic_read(APIC_LVT0);
1505         apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1506 }
1507
1508 static void disable_lapic_irq (unsigned int irq)
1509 {
1510         unsigned long v;
1511
1512         v = apic_read(APIC_LVT0);
1513         apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1514 }
1515
1516 static void ack_lapic_irq (unsigned int irq)
1517 {
1518         ack_APIC_irq();
1519 }
1520
1521 static void end_lapic_irq (unsigned int i) { /* nothing */ }
1522
1523 static struct hw_interrupt_type lapic_irq_type __read_mostly = {
1524         .typename = "local-APIC-edge",
1525         .startup = NULL, /* startup_irq() not used for IRQ0 */
1526         .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
1527         .enable = enable_lapic_irq,
1528         .disable = disable_lapic_irq,
1529         .ack = ack_lapic_irq,
1530         .end = end_lapic_irq,
1531 };
1532
1533 static void setup_nmi (void)
1534 {
1535         /*
1536          * Dirty trick to enable the NMI watchdog ...
1537          * We put the 8259A master into AEOI mode and
1538          * unmask on all local APICs LVT0 as NMI.
1539          *
1540          * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1541          * is from Maciej W. Rozycki - so we do not have to EOI from
1542          * the NMI handler or the timer interrupt.
1543          */
1544         printk(KERN_INFO "activating NMI Watchdog ...");
1545
1546         enable_NMI_through_LVT0(NULL);
1547
1548         printk(" done.\n");
1549 }
1550
1551 /*
1552  * This looks a bit hackish but it's about the only one way of sending
1553  * a few INTA cycles to 8259As and any associated glue logic.  ICR does
1554  * not support the ExtINT mode, unfortunately.  We need to send these
1555  * cycles as some i82489DX-based boards have glue logic that keeps the
1556  * 8259A interrupt line asserted until INTA.  --macro
1557  */
1558 static inline void unlock_ExtINT_logic(void)
1559 {
1560         int apic, pin, i;
1561         struct IO_APIC_route_entry entry0, entry1;
1562         unsigned char save_control, save_freq_select;
1563         unsigned long flags;
1564
1565         pin  = find_isa_irq_pin(8, mp_INT);
1566         apic = find_isa_irq_apic(8, mp_INT);
1567         if (pin == -1)
1568                 return;
1569
1570         spin_lock_irqsave(&ioapic_lock, flags);
1571         *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
1572         *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
1573         spin_unlock_irqrestore(&ioapic_lock, flags);
1574         clear_IO_APIC_pin(apic, pin);
1575
1576         memset(&entry1, 0, sizeof(entry1));
1577
1578         entry1.dest_mode = 0;                   /* physical delivery */
1579         entry1.mask = 0;                        /* unmask IRQ now */
1580         entry1.dest = hard_smp_processor_id();
1581         entry1.delivery_mode = dest_ExtINT;
1582         entry1.polarity = entry0.polarity;
1583         entry1.trigger = 0;
1584         entry1.vector = 0;
1585
1586         spin_lock_irqsave(&ioapic_lock, flags);
1587         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
1588         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
1589         spin_unlock_irqrestore(&ioapic_lock, flags);
1590
1591         save_control = CMOS_READ(RTC_CONTROL);
1592         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1593         CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
1594                    RTC_FREQ_SELECT);
1595         CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
1596
1597         i = 100;
1598         while (i-- > 0) {
1599                 mdelay(10);
1600                 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
1601                         i -= 10;
1602         }
1603
1604         CMOS_WRITE(save_control, RTC_CONTROL);
1605         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1606         clear_IO_APIC_pin(apic, pin);
1607
1608         spin_lock_irqsave(&ioapic_lock, flags);
1609         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
1610         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
1611         spin_unlock_irqrestore(&ioapic_lock, flags);
1612 }
1613
1614 /*
1615  * This code may look a bit paranoid, but it's supposed to cooperate with
1616  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
1617  * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
1618  * fanatically on his truly buggy board.
1619  *
1620  * FIXME: really need to revamp this for modern platforms only.
1621  */
1622 static inline void check_timer(void)
1623 {
1624         struct irq_cfg *cfg = irq_cfg + 0;
1625         int apic1, pin1, apic2, pin2;
1626
1627         /*
1628          * get/set the timer IRQ vector:
1629          */
1630         disable_8259A_irq(0);
1631         assign_irq_vector(0, TARGET_CPUS);
1632
1633         /*
1634          * Subtle, code in do_timer_interrupt() expects an AEOI
1635          * mode for the 8259A whenever interrupts are routed
1636          * through I/O APICs.  Also IRQ0 has to be enabled in
1637          * the 8259A which implies the virtual wire has to be
1638          * disabled in the local APIC.
1639          */
1640         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1641         init_8259A(1);
1642         if (timer_over_8254 > 0)
1643                 enable_8259A_irq(0);
1644
1645         pin1  = find_isa_irq_pin(0, mp_INT);
1646         apic1 = find_isa_irq_apic(0, mp_INT);
1647         pin2  = ioapic_i8259.pin;
1648         apic2 = ioapic_i8259.apic;
1649
1650         apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
1651                 cfg->vector, apic1, pin1, apic2, pin2);
1652
1653         if (pin1 != -1) {
1654                 /*
1655                  * Ok, does IRQ0 through the IOAPIC work?
1656                  */
1657                 unmask_IO_APIC_irq(0);
1658                 if (!no_timer_check && timer_irq_works()) {
1659                         nmi_watchdog_default();
1660                         if (nmi_watchdog == NMI_IO_APIC) {
1661                                 disable_8259A_irq(0);
1662                                 setup_nmi();
1663                                 enable_8259A_irq(0);
1664                         }
1665                         if (disable_timer_pin_1 > 0)
1666                                 clear_IO_APIC_pin(0, pin1);
1667                         return;
1668                 }
1669                 clear_IO_APIC_pin(apic1, pin1);
1670                 apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
1671                                 "connected to IO-APIC\n");
1672         }
1673
1674         apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
1675                                 "through the 8259A ... ");
1676         if (pin2 != -1) {
1677                 apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
1678                         apic2, pin2);
1679                 /*
1680                  * legacy devices should be connected to IO APIC #0
1681                  */
1682                 setup_ExtINT_IRQ0_pin(apic2, pin2, cfg->vector);
1683                 if (timer_irq_works()) {
1684                         apic_printk(APIC_VERBOSE," works.\n");
1685                         nmi_watchdog_default();
1686                         if (nmi_watchdog == NMI_IO_APIC) {
1687                                 setup_nmi();
1688                         }
1689                         return;
1690                 }
1691                 /*
1692                  * Cleanup, just in case ...
1693                  */
1694                 clear_IO_APIC_pin(apic2, pin2);
1695         }
1696         apic_printk(APIC_VERBOSE," failed.\n");
1697
1698         if (nmi_watchdog == NMI_IO_APIC) {
1699                 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1700                 nmi_watchdog = 0;
1701         }
1702
1703         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
1704
1705         disable_8259A_irq(0);
1706         irq_desc[0].chip = &lapic_irq_type;
1707         apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector);     /* Fixed mode */
1708         enable_8259A_irq(0);
1709
1710         if (timer_irq_works()) {
1711                 apic_printk(APIC_VERBOSE," works.\n");
1712                 return;
1713         }
1714         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
1715         apic_printk(APIC_VERBOSE," failed.\n");
1716
1717         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
1718
1719         init_8259A(0);
1720         make_8259A_irq(0);
1721         apic_write(APIC_LVT0, APIC_DM_EXTINT);
1722
1723         unlock_ExtINT_logic();
1724
1725         if (timer_irq_works()) {
1726                 apic_printk(APIC_VERBOSE," works.\n");
1727                 return;
1728         }
1729         apic_printk(APIC_VERBOSE," failed :(.\n");
1730         panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1731 }
1732
1733 static int __init notimercheck(char *s)
1734 {
1735         no_timer_check = 1;
1736         return 1;
1737 }
1738 __setup("no_timer_check", notimercheck);
1739
1740 /*
1741  *
1742  * IRQ's that are handled by the PIC in the MPS IOAPIC case.
1743  * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1744  *   Linux doesn't really care, as it's not actually used
1745  *   for any interrupt handling anyway.
1746  */
1747 #define PIC_IRQS        (1<<2)
1748
1749 void __init setup_IO_APIC(void)
1750 {
1751         enable_IO_APIC();
1752
1753         if (acpi_ioapic)
1754                 io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
1755         else
1756                 io_apic_irqs = ~PIC_IRQS;
1757
1758         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
1759
1760         sync_Arb_IDs();
1761         setup_IO_APIC_irqs();
1762         init_IO_APIC_traps();
1763         check_timer();
1764         if (!acpi_ioapic)
1765                 print_IO_APIC();
1766 }
1767
1768 struct sysfs_ioapic_data {
1769         struct sys_device dev;
1770         struct IO_APIC_route_entry entry[0];
1771 };
1772 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
1773
1774 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
1775 {
1776         struct IO_APIC_route_entry *entry;
1777         struct sysfs_ioapic_data *data;
1778         int i;
1779
1780         data = container_of(dev, struct sysfs_ioapic_data, dev);
1781         entry = data->entry;
1782         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
1783                 *entry = ioapic_read_entry(dev->id, i);
1784
1785         return 0;
1786 }
1787
1788 static int ioapic_resume(struct sys_device *dev)
1789 {
1790         struct IO_APIC_route_entry *entry;
1791         struct sysfs_ioapic_data *data;
1792         unsigned long flags;
1793         union IO_APIC_reg_00 reg_00;
1794         int i;
1795
1796         data = container_of(dev, struct sysfs_ioapic_data, dev);
1797         entry = data->entry;
1798
1799         spin_lock_irqsave(&ioapic_lock, flags);
1800         reg_00.raw = io_apic_read(dev->id, 0);
1801         if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
1802                 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
1803                 io_apic_write(dev->id, 0, reg_00.raw);
1804         }
1805         spin_unlock_irqrestore(&ioapic_lock, flags);
1806         for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
1807                 ioapic_write_entry(dev->id, i, entry[i]);
1808
1809         return 0;
1810 }
1811
1812 static struct sysdev_class ioapic_sysdev_class = {
1813         set_kset_name("ioapic"),
1814         .suspend = ioapic_suspend,
1815         .resume = ioapic_resume,
1816 };
1817
1818 static int __init ioapic_init_sysfs(void)
1819 {
1820         struct sys_device * dev;
1821         int i, size, error = 0;
1822
1823         error = sysdev_class_register(&ioapic_sysdev_class);
1824         if (error)
1825                 return error;
1826
1827         for (i = 0; i < nr_ioapics; i++ ) {
1828                 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
1829                         * sizeof(struct IO_APIC_route_entry);
1830                 mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
1831                 if (!mp_ioapic_data[i]) {
1832                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1833                         continue;
1834                 }
1835                 memset(mp_ioapic_data[i], 0, size);
1836                 dev = &mp_ioapic_data[i]->dev;
1837                 dev->id = i;
1838                 dev->cls = &ioapic_sysdev_class;
1839                 error = sysdev_register(dev);
1840                 if (error) {
1841                         kfree(mp_ioapic_data[i]);
1842                         mp_ioapic_data[i] = NULL;
1843                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1844                         continue;
1845                 }
1846         }
1847
1848         return 0;
1849 }
1850
1851 device_initcall(ioapic_init_sysfs);
1852
1853 /*
1854  * Dynamic irq allocate and deallocation
1855  */
1856 int create_irq(void)
1857 {
1858         /* Allocate an unused irq */
1859         int irq;
1860         int new;
1861         unsigned long flags;
1862
1863         irq = -ENOSPC;
1864         spin_lock_irqsave(&vector_lock, flags);
1865         for (new = (NR_IRQS - 1); new >= 0; new--) {
1866                 if (platform_legacy_irq(new))
1867                         continue;
1868                 if (irq_cfg[new].vector != 0)
1869                         continue;
1870                 if (__assign_irq_vector(new, TARGET_CPUS) == 0)
1871                         irq = new;
1872                 break;
1873         }
1874         spin_unlock_irqrestore(&vector_lock, flags);
1875
1876         if (irq >= 0) {
1877                 dynamic_irq_init(irq);
1878         }
1879         return irq;
1880 }
1881
1882 void destroy_irq(unsigned int irq)
1883 {
1884         unsigned long flags;
1885
1886         dynamic_irq_cleanup(irq);
1887
1888         spin_lock_irqsave(&vector_lock, flags);
1889         __clear_irq_vector(irq);
1890         spin_unlock_irqrestore(&vector_lock, flags);
1891 }
1892
1893 /*
1894  * MSI mesage composition
1895  */
1896 #ifdef CONFIG_PCI_MSI
1897 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
1898 {
1899         struct irq_cfg *cfg = irq_cfg + irq;
1900         int err;
1901         unsigned dest;
1902         cpumask_t tmp;
1903
1904         tmp = TARGET_CPUS;
1905         err = assign_irq_vector(irq, tmp);
1906         if (!err) {
1907                 cpus_and(tmp, cfg->domain, tmp);
1908                 dest = cpu_mask_to_apicid(tmp);
1909
1910                 msg->address_hi = MSI_ADDR_BASE_HI;
1911                 msg->address_lo =
1912                         MSI_ADDR_BASE_LO |
1913                         ((INT_DEST_MODE == 0) ?
1914                                 MSI_ADDR_DEST_MODE_PHYSICAL:
1915                                 MSI_ADDR_DEST_MODE_LOGICAL) |
1916                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1917                                 MSI_ADDR_REDIRECTION_CPU:
1918                                 MSI_ADDR_REDIRECTION_LOWPRI) |
1919                         MSI_ADDR_DEST_ID(dest);
1920
1921                 msg->data =
1922                         MSI_DATA_TRIGGER_EDGE |
1923                         MSI_DATA_LEVEL_ASSERT |
1924                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1925                                 MSI_DATA_DELIVERY_FIXED:
1926                                 MSI_DATA_DELIVERY_LOWPRI) |
1927                         MSI_DATA_VECTOR(cfg->vector);
1928         }
1929         return err;
1930 }
1931
1932 #ifdef CONFIG_SMP
1933 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
1934 {
1935         struct irq_cfg *cfg = irq_cfg + irq;
1936         struct msi_msg msg;
1937         unsigned int dest;
1938         cpumask_t tmp;
1939
1940         cpus_and(tmp, mask, cpu_online_map);
1941         if (cpus_empty(tmp))
1942                 return;
1943
1944         if (assign_irq_vector(irq, mask))
1945                 return;
1946
1947         cpus_and(tmp, cfg->domain, mask);
1948         dest = cpu_mask_to_apicid(tmp);
1949
1950         read_msi_msg(irq, &msg);
1951
1952         msg.data &= ~MSI_DATA_VECTOR_MASK;
1953         msg.data |= MSI_DATA_VECTOR(cfg->vector);
1954         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
1955         msg.address_lo |= MSI_ADDR_DEST_ID(dest);
1956
1957         write_msi_msg(irq, &msg);
1958         irq_desc[irq].affinity = mask;
1959 }
1960 #endif /* CONFIG_SMP */
1961
1962 /*
1963  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
1964  * which implement the MSI or MSI-X Capability Structure.
1965  */
1966 static struct irq_chip msi_chip = {
1967         .name           = "PCI-MSI",
1968         .unmask         = unmask_msi_irq,
1969         .mask           = mask_msi_irq,
1970         .ack            = ack_apic_edge,
1971 #ifdef CONFIG_SMP
1972         .set_affinity   = set_msi_irq_affinity,
1973 #endif
1974         .retrigger      = ioapic_retrigger_irq,
1975 };
1976
1977 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
1978 {
1979         struct msi_msg msg;
1980         int irq, ret;
1981         irq = create_irq();
1982         if (irq < 0)
1983                 return irq;
1984
1985         set_irq_msi(irq, desc);
1986         ret = msi_compose_msg(dev, irq, &msg);
1987         if (ret < 0) {
1988                 destroy_irq(irq);
1989                 return ret;
1990         }
1991
1992         write_msi_msg(irq, &msg);
1993
1994         set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
1995
1996         return irq;
1997 }
1998
1999 void arch_teardown_msi_irq(unsigned int irq)
2000 {
2001         destroy_irq(irq);
2002 }
2003
2004 #endif /* CONFIG_PCI_MSI */
2005
2006 /*
2007  * Hypertransport interrupt support
2008  */
2009 #ifdef CONFIG_HT_IRQ
2010
2011 #ifdef CONFIG_SMP
2012
2013 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
2014 {
2015         struct ht_irq_msg msg;
2016         fetch_ht_irq_msg(irq, &msg);
2017
2018         msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
2019         msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
2020
2021         msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
2022         msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
2023
2024         write_ht_irq_msg(irq, &msg);
2025 }
2026
2027 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2028 {
2029         struct irq_cfg *cfg = irq_cfg + irq;
2030         unsigned int dest;
2031         cpumask_t tmp;
2032
2033         cpus_and(tmp, mask, cpu_online_map);
2034         if (cpus_empty(tmp))
2035                 return;
2036
2037         if (assign_irq_vector(irq, mask))
2038                 return;
2039
2040         cpus_and(tmp, cfg->domain, mask);
2041         dest = cpu_mask_to_apicid(tmp);
2042
2043         target_ht_irq(irq, dest, cfg->vector);
2044         irq_desc[irq].affinity = mask;
2045 }
2046 #endif
2047
2048 static struct irq_chip ht_irq_chip = {
2049         .name           = "PCI-HT",
2050         .mask           = mask_ht_irq,
2051         .unmask         = unmask_ht_irq,
2052         .ack            = ack_apic_edge,
2053 #ifdef CONFIG_SMP
2054         .set_affinity   = set_ht_irq_affinity,
2055 #endif
2056         .retrigger      = ioapic_retrigger_irq,
2057 };
2058
2059 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2060 {
2061         struct irq_cfg *cfg = irq_cfg + irq;
2062         int err;
2063         cpumask_t tmp;
2064
2065         tmp = TARGET_CPUS;
2066         err = assign_irq_vector(irq, tmp);
2067         if (!err) {
2068                 struct ht_irq_msg msg;
2069                 unsigned dest;
2070
2071                 cpus_and(tmp, cfg->domain, tmp);
2072                 dest = cpu_mask_to_apicid(tmp);
2073
2074                 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
2075
2076                 msg.address_lo =
2077                         HT_IRQ_LOW_BASE |
2078                         HT_IRQ_LOW_DEST_ID(dest) |
2079                         HT_IRQ_LOW_VECTOR(cfg->vector) |
2080                         ((INT_DEST_MODE == 0) ?
2081                                 HT_IRQ_LOW_DM_PHYSICAL :
2082                                 HT_IRQ_LOW_DM_LOGICAL) |
2083                         HT_IRQ_LOW_RQEOI_EDGE |
2084                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2085                                 HT_IRQ_LOW_MT_FIXED :
2086                                 HT_IRQ_LOW_MT_ARBITRATED) |
2087                         HT_IRQ_LOW_IRQ_MASKED;
2088
2089                 write_ht_irq_msg(irq, &msg);
2090
2091                 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2092                                               handle_edge_irq, "edge");
2093         }
2094         return err;
2095 }
2096 #endif /* CONFIG_HT_IRQ */
2097
2098 /* --------------------------------------------------------------------------
2099                           ACPI-based IOAPIC Configuration
2100    -------------------------------------------------------------------------- */
2101
2102 #ifdef CONFIG_ACPI
2103
2104 #define IO_APIC_MAX_ID          0xFE
2105
2106 int __init io_apic_get_redir_entries (int ioapic)
2107 {
2108         union IO_APIC_reg_01    reg_01;
2109         unsigned long flags;
2110
2111         spin_lock_irqsave(&ioapic_lock, flags);
2112         reg_01.raw = io_apic_read(ioapic, 1);
2113         spin_unlock_irqrestore(&ioapic_lock, flags);
2114
2115         return reg_01.bits.entries;
2116 }
2117
2118
2119 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
2120 {
2121         if (!IO_APIC_IRQ(irq)) {
2122                 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2123                         ioapic);
2124                 return -EINVAL;
2125         }
2126
2127         /*
2128          * IRQs < 16 are already in the irq_2_pin[] map
2129          */
2130         if (irq >= 16)
2131                 add_pin_to_irq(irq, ioapic, pin);
2132
2133         setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
2134
2135         return 0;
2136 }
2137
2138 #endif /* CONFIG_ACPI */
2139
2140
2141 /*
2142  * This function currently is only a helper for the i386 smp boot process where
2143  * we need to reprogram the ioredtbls to cater for the cpus which have come online
2144  * so mask in all cases should simply be TARGET_CPUS
2145  */
2146 #ifdef CONFIG_SMP
2147 void __init setup_ioapic_dest(void)
2148 {
2149         int pin, ioapic, irq, irq_entry;
2150
2151         if (skip_ioapic_setup == 1)
2152                 return;
2153
2154         for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
2155                 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
2156                         irq_entry = find_irq_entry(ioapic, pin, mp_INT);
2157                         if (irq_entry == -1)
2158                                 continue;
2159                         irq = pin_2_irq(irq_entry, ioapic, pin);
2160
2161                         /* setup_IO_APIC_irqs could fail to get vector for some device
2162                          * when you have too many devices, because at that time only boot
2163                          * cpu is online.
2164                          */
2165                         if (!irq_cfg[irq].vector)
2166                                 setup_IO_APIC_irq(ioapic, pin, irq,
2167                                                   irq_trigger(irq_entry),
2168                                                   irq_polarity(irq_entry));
2169                         else
2170                                 set_ioapic_affinity_irq(irq, TARGET_CPUS);
2171                 }
2172
2173         }
2174 }
2175 #endif