git.oblomov.eu Git - linux-2.6/blob - arch/i386/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/mc146818rtc.h>
  30 #include <linux/compiler.h>
  31 #include <linux/acpi.h>
  32 #include <linux/module.h>
  33 #include <linux/sysdev.h>
  34 #include <linux/pci.h>
  35 #include <linux/msi.h>
  36 #include <linux/htirq.h>
  37 #include <linux/freezer.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/smp.h>
  41 #include <asm/desc.h>
  42 #include <asm/timer.h>
  43 #include <asm/i8259.h>
  44 #include <asm/nmi.h>
  45 #include <asm/msidef.h>
  46 #include <asm/hypertransport.h>
  47
  48 #include <mach_apic.h>
  49 #include <mach_apicdef.h>
  50
  51 #include "io_ports.h"
  52
  53 int (*ioapic_renumber_irq)(int ioapic, int irq);
  54 atomic_t irq_mis_count;
  55
  56 /* Where if anywhere is the i8259 connect in external int mode */
  57 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
  58
  59 static DEFINE_SPINLOCK(ioapic_lock);
  60 static DEFINE_SPINLOCK(vector_lock);
  61
  62 int timer_over_8254 __initdata = 1;
  63
  64 /*
  65  *      Is the SiS APIC rmw bug present ?
  66  *      -1 = don't know, 0 = no, 1 = yes
  67  */
  68 int sis_apic_bug = -1;
  69
  70 /*
  71  * # of IRQ routing registers
  72  */
  73 int nr_ioapic_registers[MAX_IO_APICS];
  74
  75 static int disable_timer_pin_1 __initdata;
  76
  77 /*
  78  * Rough estimation of how many shared IRQs there are, can
  79  * be changed anytime.
  80  */
  81 #define MAX_PLUS_SHARED_IRQS NR_IRQS
  82 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
  83
  84 /*
  85  * This is performance-critical, we want to do it O(1)
  86  *
  87  * the indexing order of this array favors 1:1 mappings
  88  * between pins and IRQs.
  89  */
  90
  91 static struct irq_pin_list {
  92         int apic, pin, next;
  93 } irq_2_pin[PIN_MAP_SIZE];
  94
  95 struct io_apic {
  96         unsigned int index;
  97         unsigned int unused[3];
  98         unsigned int data;
  99 };
 100
 101 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
 102 {
 103         return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
 104                 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
 105 }
 106
 107 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
 108 {
 109         struct io_apic __iomem *io_apic = io_apic_base(apic);
 110         writel(reg, &io_apic->index);
 111         return readl(&io_apic->data);
 112 }
 113
 114 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
 115 {
 116         struct io_apic __iomem *io_apic = io_apic_base(apic);
 117         writel(reg, &io_apic->index);
 118         writel(value, &io_apic->data);
 119 }
 120
 121 /*
 122  * Re-write a value: to be used for read-modify-write
 123  * cycles where the read already set up the index register.
 124  *
 125  * Older SiS APIC requires we rewrite the index register
 126  */
 127 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
 128 {
 129         volatile struct io_apic *io_apic = io_apic_base(apic);
 130         if (sis_apic_bug)
 131                 writel(reg, &io_apic->index);
 132         writel(value, &io_apic->data);
 133 }
 134
 135 union entry_union {
 136         struct { u32 w1, w2; };
 137         struct IO_APIC_route_entry entry;
 138 };
 139
 140 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
 141 {
 142         union entry_union eu;
 143         unsigned long flags;
 144         spin_lock_irqsave(&ioapic_lock, flags);
 145         eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
 146         eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
 147         spin_unlock_irqrestore(&ioapic_lock, flags);
 148         return eu.entry;
 149 }
 150
 151 /*
 152  * When we write a new IO APIC routing entry, we need to write the high
 153  * word first! If the mask bit in the low word is clear, we will enable
 154  * the interrupt, and we need to make sure the entry is fully populated
 155  * before that happens.
 156  */
 157 static void
 158 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
 159 {
 160         union entry_union eu;
 161         eu.entry = e;
 162         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
 163         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
 164 }
 165
 166 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
 167 {
 168         unsigned long flags;
 169         spin_lock_irqsave(&ioapic_lock, flags);
 170         __ioapic_write_entry(apic, pin, e);
 171         spin_unlock_irqrestore(&ioapic_lock, flags);
 172 }
 173
 174 /*
 175  * When we mask an IO APIC routing entry, we need to write the low
 176  * word first, in order to set the mask bit before we change the
 177  * high bits!
 178  */
 179 static void ioapic_mask_entry(int apic, int pin)
 180 {
 181         unsigned long flags;
 182         union entry_union eu = { .entry.mask = 1 };
 183
 184         spin_lock_irqsave(&ioapic_lock, flags);
 185         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
 186         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
 187         spin_unlock_irqrestore(&ioapic_lock, flags);
 188 }
 189
 190 /*
 191  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
 192  * shared ISA-space IRQs, so we have to support them. We are super
 193  * fast in the common case, and fast for shared ISA-space IRQs.
 194  */
 195 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
 196 {
 197         static int first_free_entry = NR_IRQS;
 198         struct irq_pin_list *entry = irq_2_pin + irq;
 199
 200         while (entry->next)
 201                 entry = irq_2_pin + entry->next;
 202
 203         if (entry->pin != -1) {
 204                 entry->next = first_free_entry;
 205                 entry = irq_2_pin + entry->next;
 206                 if (++first_free_entry >= PIN_MAP_SIZE)
 207                         panic("io_apic.c: whoops");
 208         }
 209         entry->apic = apic;
 210         entry->pin = pin;
 211 }
 212
 213 /*
 214  * Reroute an IRQ to a different pin.
 215  */
 216 static void __init replace_pin_at_irq(unsigned int irq,
 217                                       int oldapic, int oldpin,
 218                                       int newapic, int newpin)
 219 {
 220         struct irq_pin_list *entry = irq_2_pin + irq;
 221
 222         while (1) {
 223                 if (entry->apic == oldapic && entry->pin == oldpin) {
 224                         entry->apic = newapic;
 225                         entry->pin = newpin;
 226                 }
 227                 if (!entry->next)
 228                         break;
 229                 entry = irq_2_pin + entry->next;
 230         }
 231 }
 232
 233 static void __modify_IO_APIC_irq (unsigned int irq, unsigned long enable, unsigned long disable)
 234 {
 235         struct irq_pin_list *entry = irq_2_pin + irq;
 236         unsigned int pin, reg;
 237
 238         for (;;) {
 239                 pin = entry->pin;
 240                 if (pin == -1)
 241                         break;
 242                 reg = io_apic_read(entry->apic, 0x10 + pin*2);
 243                 reg &= ~disable;
 244                 reg |= enable;
 245                 io_apic_modify(entry->apic, 0x10 + pin*2, reg);
 246                 if (!entry->next)
 247                         break;
 248                 entry = irq_2_pin + entry->next;
 249         }
 250 }
 251
 252 /* mask = 1 */
 253 static void __mask_IO_APIC_irq (unsigned int irq)
 254 {
 255         __modify_IO_APIC_irq(irq, 0x00010000, 0);
 256 }
 257
 258 /* mask = 0 */
 259 static void __unmask_IO_APIC_irq (unsigned int irq)
 260 {
 261         __modify_IO_APIC_irq(irq, 0, 0x00010000);
 262 }
 263
 264 /* mask = 1, trigger = 0 */
 265 static void __mask_and_edge_IO_APIC_irq (unsigned int irq)
 266 {
 267         __modify_IO_APIC_irq(irq, 0x00010000, 0x00008000);
 268 }
 269
 270 /* mask = 0, trigger = 1 */
 271 static void __unmask_and_level_IO_APIC_irq (unsigned int irq)
 272 {
 273         __modify_IO_APIC_irq(irq, 0x00008000, 0x00010000);
 274 }
 275
 276 static void mask_IO_APIC_irq (unsigned int irq)
 277 {
 278         unsigned long flags;
 279
 280         spin_lock_irqsave(&ioapic_lock, flags);
 281         __mask_IO_APIC_irq(irq);
 282         spin_unlock_irqrestore(&ioapic_lock, flags);
 283 }
 284
 285 static void unmask_IO_APIC_irq (unsigned int irq)
 286 {
 287         unsigned long flags;
 288
 289         spin_lock_irqsave(&ioapic_lock, flags);
 290         __unmask_IO_APIC_irq(irq);
 291         spin_unlock_irqrestore(&ioapic_lock, flags);
 292 }
 293
 294 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
 295 {
 296         struct IO_APIC_route_entry entry;
 297
 298         /* Check delivery_mode to be sure we're not clearing an SMI pin */
 299         entry = ioapic_read_entry(apic, pin);
 300         if (entry.delivery_mode == dest_SMI)
 301                 return;
 302
 303         /*
 304          * Disable it in the IO-APIC irq-routing table:
 305          */
 306         ioapic_mask_entry(apic, pin);
 307 }
 308
 309 static void clear_IO_APIC (void)
 310 {
 311         int apic, pin;
 312
 313         for (apic = 0; apic < nr_ioapics; apic++)
 314                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
 315                         clear_IO_APIC_pin(apic, pin);
 316 }
 317
 318 #ifdef CONFIG_SMP
 319 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
 320 {
 321         unsigned long flags;
 322         int pin;
 323         struct irq_pin_list *entry = irq_2_pin + irq;
 324         unsigned int apicid_value;
 325         cpumask_t tmp;
 326
 327         cpus_and(tmp, cpumask, cpu_online_map);
 328         if (cpus_empty(tmp))
 329                 tmp = TARGET_CPUS;
 330
 331         cpus_and(cpumask, tmp, CPU_MASK_ALL);
 332
 333         apicid_value = cpu_mask_to_apicid(cpumask);
 334         /* Prepare to do the io_apic_write */
 335         apicid_value = apicid_value << 24;
 336         spin_lock_irqsave(&ioapic_lock, flags);
 337         for (;;) {
 338                 pin = entry->pin;
 339                 if (pin == -1)
 340                         break;
 341                 io_apic_write(entry->apic, 0x10 + 1 + pin*2, apicid_value);
 342                 if (!entry->next)
 343                         break;
 344                 entry = irq_2_pin + entry->next;
 345         }
 346         set_native_irq_info(irq, cpumask);
 347         spin_unlock_irqrestore(&ioapic_lock, flags);
 348 }
 349
 350 #if defined(CONFIG_IRQBALANCE)
 351 # include <asm/processor.h>     /* kernel_thread() */
 352 # include <linux/kernel_stat.h> /* kstat */
 353 # include <linux/slab.h>                /* kmalloc() */
 354 # include <linux/timer.h>       /* time_after() */
 355
 356 #ifdef CONFIG_BALANCED_IRQ_DEBUG
 357 #  define TDprintk(x...) do { printk("<%ld:%s:%d>: ", jiffies, __FILE__, __LINE__); printk(x); } while (0)
 358 #  define Dprintk(x...) do { TDprintk(x); } while (0)
 359 # else
 360 #  define TDprintk(x...)
 361 #  define Dprintk(x...)
 362 # endif
 363
 364 #define IRQBALANCE_CHECK_ARCH -999
 365 #define MAX_BALANCED_IRQ_INTERVAL       (5*HZ)
 366 #define MIN_BALANCED_IRQ_INTERVAL       (HZ/2)
 367 #define BALANCED_IRQ_MORE_DELTA         (HZ/10)
 368 #define BALANCED_IRQ_LESS_DELTA         (HZ)
 369
 370 static int irqbalance_disabled __read_mostly = IRQBALANCE_CHECK_ARCH;
 371 static int physical_balance __read_mostly;
 372 static long balanced_irq_interval __read_mostly = MAX_BALANCED_IRQ_INTERVAL;
 373
 374 static struct irq_cpu_info {
 375         unsigned long * last_irq;
 376         unsigned long * irq_delta;
 377         unsigned long irq;
 378 } irq_cpu_data[NR_CPUS];
 379
 380 #define CPU_IRQ(cpu)            (irq_cpu_data[cpu].irq)
 381 #define LAST_CPU_IRQ(cpu,irq)   (irq_cpu_data[cpu].last_irq[irq])
 382 #define IRQ_DELTA(cpu,irq)      (irq_cpu_data[cpu].irq_delta[irq])
 383
 384 #define IDLE_ENOUGH(cpu,now) \
 385         (idle_cpu(cpu) && ((now) - per_cpu(irq_stat, (cpu)).idle_timestamp > 1))
 386
 387 #define IRQ_ALLOWED(cpu, allowed_mask)  cpu_isset(cpu, allowed_mask)
 388
 389 #define CPU_TO_PACKAGEINDEX(i) (first_cpu(cpu_sibling_map[i]))
 390
 391 static cpumask_t balance_irq_affinity[NR_IRQS] = {
 392         [0 ... NR_IRQS-1] = CPU_MASK_ALL
 393 };
 394
 395 void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 396 {
 397         balance_irq_affinity[irq] = mask;
 398 }
 399
 400 static unsigned long move(int curr_cpu, cpumask_t allowed_mask,
 401                         unsigned long now, int direction)
 402 {
 403         int search_idle = 1;
 404         int cpu = curr_cpu;
 405
 406         goto inside;
 407
 408         do {
 409                 if (unlikely(cpu == curr_cpu))
 410                         search_idle = 0;
 411 inside:
 412                 if (direction == 1) {
 413                         cpu++;
 414                         if (cpu >= NR_CPUS)
 415                                 cpu = 0;
 416                 } else {
 417                         cpu--;
 418                         if (cpu == -1)
 419                                 cpu = NR_CPUS-1;
 420                 }
 421         } while (!cpu_online(cpu) || !IRQ_ALLOWED(cpu,allowed_mask) ||
 422                         (search_idle && !IDLE_ENOUGH(cpu,now)));
 423
 424         return cpu;
 425 }
 426
 427 static inline void balance_irq(int cpu, int irq)
 428 {
 429         unsigned long now = jiffies;
 430         cpumask_t allowed_mask;
 431         unsigned int new_cpu;
 432
 433         if (irqbalance_disabled)
 434                 return;
 435
 436         cpus_and(allowed_mask, cpu_online_map, balance_irq_affinity[irq]);
 437         new_cpu = move(cpu, allowed_mask, now, 1);
 438         if (cpu != new_cpu) {
 439                 set_pending_irq(irq, cpumask_of_cpu(new_cpu));
 440         }
 441 }
 442
 443 static inline void rotate_irqs_among_cpus(unsigned long useful_load_threshold)
 444 {
 445         int i, j;
 446         Dprintk("Rotating IRQs among CPUs.\n");
 447         for_each_online_cpu(i) {
 448                 for (j = 0; j < NR_IRQS; j++) {
 449                         if (!irq_desc[j].action)
 450                                 continue;
 451                         /* Is it a significant load ?  */
 452                         if (IRQ_DELTA(CPU_TO_PACKAGEINDEX(i),j) <
 453                                                 useful_load_threshold)
 454                                 continue;
 455                         balance_irq(i, j);
 456                 }
 457         }
 458         balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
 459                 balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
 460         return;
 461 }
 462
 463 static void do_irq_balance(void)
 464 {
 465         int i, j;
 466         unsigned long max_cpu_irq = 0, min_cpu_irq = (~0);
 467         unsigned long move_this_load = 0;
 468         int max_loaded = 0, min_loaded = 0;
 469         int load;
 470         unsigned long useful_load_threshold = balanced_irq_interval + 10;
 471         int selected_irq;
 472         int tmp_loaded, first_attempt = 1;
 473         unsigned long tmp_cpu_irq;
 474         unsigned long imbalance = 0;
 475         cpumask_t allowed_mask, target_cpu_mask, tmp;
 476
 477         for_each_possible_cpu(i) {
 478                 int package_index;
 479                 CPU_IRQ(i) = 0;
 480                 if (!cpu_online(i))
 481                         continue;
 482                 package_index = CPU_TO_PACKAGEINDEX(i);
 483                 for (j = 0; j < NR_IRQS; j++) {
 484                         unsigned long value_now, delta;
 485                         /* Is this an active IRQ? */
 486                         if (!irq_desc[j].action)
 487                                 continue;
 488                         if ( package_index == i )
 489                                 IRQ_DELTA(package_index,j) = 0;
 490                         /* Determine the total count per processor per IRQ */
 491                         value_now = (unsigned long) kstat_cpu(i).irqs[j];
 492
 493                         /* Determine the activity per processor per IRQ */
 494                         delta = value_now - LAST_CPU_IRQ(i,j);
 495
 496                         /* Update last_cpu_irq[][] for the next time */
 497                         LAST_CPU_IRQ(i,j) = value_now;
 498
 499                         /* Ignore IRQs whose rate is less than the clock */
 500                         if (delta < useful_load_threshold)
 501                                 continue;
 502                         /* update the load for the processor or package total */
 503                         IRQ_DELTA(package_index,j) += delta;
 504
 505                         /* Keep track of the higher numbered sibling as well */
 506                         if (i != package_index)
 507                                 CPU_IRQ(i) += delta;
 508                         /*
 509                          * We have sibling A and sibling B in the package
 510                          *
 511                          * cpu_irq[A] = load for cpu A + load for cpu B
 512                          * cpu_irq[B] = load for cpu B
 513                          */
 514                         CPU_IRQ(package_index) += delta;
 515                 }
 516         }
 517         /* Find the least loaded processor package */
 518         for_each_online_cpu(i) {
 519                 if (i != CPU_TO_PACKAGEINDEX(i))
 520                         continue;
 521                 if (min_cpu_irq > CPU_IRQ(i)) {
 522                         min_cpu_irq = CPU_IRQ(i);
 523                         min_loaded = i;
 524                 }
 525         }
 526         max_cpu_irq = ULONG_MAX;
 527
 528 tryanothercpu:
 529         /* Look for heaviest loaded processor.
 530          * We may come back to get the next heaviest loaded processor.
 531          * Skip processors with trivial loads.
 532          */
 533         tmp_cpu_irq = 0;
 534         tmp_loaded = -1;
 535         for_each_online_cpu(i) {
 536                 if (i != CPU_TO_PACKAGEINDEX(i))
 537                         continue;
 538                 if (max_cpu_irq <= CPU_IRQ(i))
 539                         continue;
 540                 if (tmp_cpu_irq < CPU_IRQ(i)) {
 541                         tmp_cpu_irq = CPU_IRQ(i);
 542                         tmp_loaded = i;
 543                 }
 544         }
 545
 546         if (tmp_loaded == -1) {
 547          /* In the case of small number of heavy interrupt sources,
 548           * loading some of the cpus too much. We use Ingo's original
 549           * approach to rotate them around.
 550           */
 551                 if (!first_attempt && imbalance >= useful_load_threshold) {
 552                         rotate_irqs_among_cpus(useful_load_threshold);
 553                         return;
 554                 }
 555                 goto not_worth_the_effort;
 556         }
 557
 558         first_attempt = 0;              /* heaviest search */
 559         max_cpu_irq = tmp_cpu_irq;      /* load */
 560         max_loaded = tmp_loaded;        /* processor */
 561         imbalance = (max_cpu_irq - min_cpu_irq) / 2;
 562
 563         Dprintk("max_loaded cpu = %d\n", max_loaded);
 564         Dprintk("min_loaded cpu = %d\n", min_loaded);
 565         Dprintk("max_cpu_irq load = %ld\n", max_cpu_irq);
 566         Dprintk("min_cpu_irq load = %ld\n", min_cpu_irq);
 567         Dprintk("load imbalance = %lu\n", imbalance);
 568
 569         /* if imbalance is less than approx 10% of max load, then
 570          * observe diminishing returns action. - quit
 571          */
 572         if (imbalance < (max_cpu_irq >> 3)) {
 573                 Dprintk("Imbalance too trivial\n");
 574                 goto not_worth_the_effort;
 575         }
 576
 577 tryanotherirq:
 578         /* if we select an IRQ to move that can't go where we want, then
 579          * see if there is another one to try.
 580          */
 581         move_this_load = 0;
 582         selected_irq = -1;
 583         for (j = 0; j < NR_IRQS; j++) {
 584                 /* Is this an active IRQ? */
 585                 if (!irq_desc[j].action)
 586                         continue;
 587                 if (imbalance <= IRQ_DELTA(max_loaded,j))
 588                         continue;
 589                 /* Try to find the IRQ that is closest to the imbalance
 590                  * without going over.
 591                  */
 592                 if (move_this_load < IRQ_DELTA(max_loaded,j)) {
 593                         move_this_load = IRQ_DELTA(max_loaded,j);
 594                         selected_irq = j;
 595                 }
 596         }
 597         if (selected_irq == -1) {
 598                 goto tryanothercpu;
 599         }
 600
 601         imbalance = move_this_load;
 602
 603         /* For physical_balance case, we accumlated both load
 604          * values in the one of the siblings cpu_irq[],
 605          * to use the same code for physical and logical processors
 606          * as much as possible.
 607          *
 608          * NOTE: the cpu_irq[] array holds the sum of the load for
 609          * sibling A and sibling B in the slot for the lowest numbered
 610          * sibling (A), _AND_ the load for sibling B in the slot for
 611          * the higher numbered sibling.
 612          *
 613          * We seek the least loaded sibling by making the comparison
 614          * (A+B)/2 vs B
 615          */
 616         load = CPU_IRQ(min_loaded) >> 1;
 617         for_each_cpu_mask(j, cpu_sibling_map[min_loaded]) {
 618                 if (load > CPU_IRQ(j)) {
 619                         /* This won't change cpu_sibling_map[min_loaded] */
 620                         load = CPU_IRQ(j);
 621                         min_loaded = j;
 622                 }
 623         }
 624
 625         cpus_and(allowed_mask,
 626                 cpu_online_map,
 627                 balance_irq_affinity[selected_irq]);
 628         target_cpu_mask = cpumask_of_cpu(min_loaded);
 629         cpus_and(tmp, target_cpu_mask, allowed_mask);
 630
 631         if (!cpus_empty(tmp)) {
 632
 633                 Dprintk("irq = %d moved to cpu = %d\n",
 634                                 selected_irq, min_loaded);
 635                 /* mark for change destination */
 636                 set_pending_irq(selected_irq, cpumask_of_cpu(min_loaded));
 637
 638                 /* Since we made a change, come back sooner to
 639                  * check for more variation.
 640                  */
 641                 balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
 642                         balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
 643                 return;
 644         }
 645         goto tryanotherirq;
 646
 647 not_worth_the_effort:
 648         /*
 649          * if we did not find an IRQ to move, then adjust the time interval
 650          * upward
 651          */
 652         balanced_irq_interval = min((long)MAX_BALANCED_IRQ_INTERVAL,
 653                 balanced_irq_interval + BALANCED_IRQ_MORE_DELTA);
 654         Dprintk("IRQ worth rotating not found\n");
 655         return;
 656 }
 657
 658 static int balanced_irq(void *unused)
 659 {
 660         int i;
 661         unsigned long prev_balance_time = jiffies;
 662         long time_remaining = balanced_irq_interval;
 663
 664         daemonize("kirqd");
 665
 666         /* push everything to CPU 0 to give us a starting point.  */
 667         for (i = 0 ; i < NR_IRQS ; i++) {
 668                 irq_desc[i].pending_mask = cpumask_of_cpu(0);
 669                 set_pending_irq(i, cpumask_of_cpu(0));
 670         }
 671
 672         for ( ; ; ) {
 673                 time_remaining = schedule_timeout_interruptible(time_remaining);
 674                 try_to_freeze();
 675                 if (time_after(jiffies,
 676                                 prev_balance_time+balanced_irq_interval)) {
 677                         preempt_disable();
 678                         do_irq_balance();
 679                         prev_balance_time = jiffies;
 680                         time_remaining = balanced_irq_interval;
 681                         preempt_enable();
 682                 }
 683         }
 684         return 0;
 685 }
 686
 687 static int __init balanced_irq_init(void)
 688 {
 689         int i;
 690         struct cpuinfo_x86 *c;
 691         cpumask_t tmp;
 692
 693         cpus_shift_right(tmp, cpu_online_map, 2);
 694         c = &boot_cpu_data;
 695         /* When not overwritten by the command line ask subarchitecture. */
 696         if (irqbalance_disabled == IRQBALANCE_CHECK_ARCH)
 697                 irqbalance_disabled = NO_BALANCE_IRQ;
 698         if (irqbalance_disabled)
 699                 return 0;
 700
 701          /* disable irqbalance completely if there is only one processor online */
 702         if (num_online_cpus() < 2) {
 703                 irqbalance_disabled = 1;
 704                 return 0;
 705         }
 706         /*
 707          * Enable physical balance only if more than 1 physical processor
 708          * is present
 709          */
 710         if (smp_num_siblings > 1 && !cpus_empty(tmp))
 711                 physical_balance = 1;
 712
 713         for_each_online_cpu(i) {
 714                 irq_cpu_data[i].irq_delta = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
 715                 irq_cpu_data[i].last_irq = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
 716                 if (irq_cpu_data[i].irq_delta == NULL || irq_cpu_data[i].last_irq == NULL) {
 717                         printk(KERN_ERR "balanced_irq_init: out of memory");
 718                         goto failed;
 719                 }
 720                 memset(irq_cpu_data[i].irq_delta,0,sizeof(unsigned long) * NR_IRQS);
 721                 memset(irq_cpu_data[i].last_irq,0,sizeof(unsigned long) * NR_IRQS);
 722         }
 723
 724         printk(KERN_INFO "Starting balanced_irq\n");
 725         if (kernel_thread(balanced_irq, NULL, CLONE_KERNEL) >= 0)
 726                 return 0;
 727         else
 728                 printk(KERN_ERR "balanced_irq_init: failed to spawn balanced_irq");
 729 failed:
 730         for_each_possible_cpu(i) {
 731                 kfree(irq_cpu_data[i].irq_delta);
 732                 irq_cpu_data[i].irq_delta = NULL;
 733                 kfree(irq_cpu_data[i].last_irq);
 734                 irq_cpu_data[i].last_irq = NULL;
 735         }
 736         return 0;
 737 }
 738
 739 int __init irqbalance_disable(char *str)
 740 {
 741         irqbalance_disabled = 1;
 742         return 1;
 743 }
 744
 745 __setup("noirqbalance", irqbalance_disable);
 746
 747 late_initcall(balanced_irq_init);
 748 #endif /* CONFIG_IRQBALANCE */
 749 #endif /* CONFIG_SMP */
 750
 751 #ifndef CONFIG_SMP
 752 void fastcall send_IPI_self(int vector)
 753 {
 754         unsigned int cfg;
 755
 756         /*
 757          * Wait for idle.
 758          */
 759         apic_wait_icr_idle();
 760         cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL;
 761         /*
 762          * Send the IPI. The write to APIC_ICR fires this off.
 763          */
 764         apic_write_around(APIC_ICR, cfg);
 765 }
 766 #endif /* !CONFIG_SMP */
 767
 768
 769 /*
 770  * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
 771  * specific CPU-side IRQs.
 772  */
 773
 774 #define MAX_PIRQS 8
 775 static int pirq_entries [MAX_PIRQS];
 776 static int pirqs_enabled;
 777 int skip_ioapic_setup;
 778
 779 static int __init ioapic_setup(char *str)
 780 {
 781         skip_ioapic_setup = 1;
 782         return 1;
 783 }
 784
 785 __setup("noapic", ioapic_setup);
 786
 787 static int __init ioapic_pirq_setup(char *str)
 788 {
 789         int i, max;
 790         int ints[MAX_PIRQS+1];
 791
 792         get_options(str, ARRAY_SIZE(ints), ints);
 793
 794         for (i = 0; i < MAX_PIRQS; i++)
 795                 pirq_entries[i] = -1;
 796
 797         pirqs_enabled = 1;
 798         apic_printk(APIC_VERBOSE, KERN_INFO
 799                         "PIRQ redirection, working around broken MP-BIOS.\n");
 800         max = MAX_PIRQS;
 801         if (ints[0] < MAX_PIRQS)
 802                 max = ints[0];
 803
 804         for (i = 0; i < max; i++) {
 805                 apic_printk(APIC_VERBOSE, KERN_DEBUG
 806                                 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
 807                 /*
 808                  * PIRQs are mapped upside down, usually.
 809                  */
 810                 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
 811         }
 812         return 1;
 813 }
 814
 815 __setup("pirq=", ioapic_pirq_setup);
 816
 817 /*
 818  * Find the IRQ entry number of a certain pin.
 819  */
 820 static int find_irq_entry(int apic, int pin, int type)
 821 {
 822         int i;
 823
 824         for (i = 0; i < mp_irq_entries; i++)
 825                 if (mp_irqs[i].mpc_irqtype == type &&
 826                     (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
 827                      mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
 828                     mp_irqs[i].mpc_dstirq == pin)
 829                         return i;
 830
 831         return -1;
 832 }
 833
 834 /*
 835  * Find the pin to which IRQ[irq] (ISA) is connected
 836  */
 837 static int __init find_isa_irq_pin(int irq, int type)
 838 {
 839         int i;
 840
 841         for (i = 0; i < mp_irq_entries; i++) {
 842                 int lbus = mp_irqs[i].mpc_srcbus;
 843
 844                 if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
 845                      mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
 846                      mp_bus_id_to_type[lbus] == MP_BUS_MCA
 847                     ) &&
 848                     (mp_irqs[i].mpc_irqtype == type) &&
 849                     (mp_irqs[i].mpc_srcbusirq == irq))
 850
 851                         return mp_irqs[i].mpc_dstirq;
 852         }
 853         return -1;
 854 }
 855
 856 static int __init find_isa_irq_apic(int irq, int type)
 857 {
 858         int i;
 859
 860         for (i = 0; i < mp_irq_entries; i++) {
 861                 int lbus = mp_irqs[i].mpc_srcbus;
 862
 863                 if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
 864                      mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
 865                      mp_bus_id_to_type[lbus] == MP_BUS_MCA
 866                     ) &&
 867                     (mp_irqs[i].mpc_irqtype == type) &&
 868                     (mp_irqs[i].mpc_srcbusirq == irq))
 869                         break;
 870         }
 871         if (i < mp_irq_entries) {
 872                 int apic;
 873                 for(apic = 0; apic < nr_ioapics; apic++) {
 874                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
 875                                 return apic;
 876                 }
 877         }
 878
 879         return -1;
 880 }
 881
 882 /*
 883  * Find a specific PCI IRQ entry.
 884  * Not an __init, possibly needed by modules
 885  */
 886 static int pin_2_irq(int idx, int apic, int pin);
 887
 888 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
 889 {
 890         int apic, i, best_guess = -1;
 891
 892         apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, "
 893                 "slot:%d, pin:%d.\n", bus, slot, pin);
 894         if (mp_bus_id_to_pci_bus[bus] == -1) {
 895                 printk(KERN_WARNING "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
 896                 return -1;
 897         }
 898         for (i = 0; i < mp_irq_entries; i++) {
 899                 int lbus = mp_irqs[i].mpc_srcbus;
 900
 901                 for (apic = 0; apic < nr_ioapics; apic++)
 902                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
 903                             mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
 904                                 break;
 905
 906                 if ((mp_bus_id_to_type[lbus] == MP_BUS_PCI) &&
 907                     !mp_irqs[i].mpc_irqtype &&
 908                     (bus == lbus) &&
 909                     (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
 910                         int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
 911
 912                         if (!(apic || IO_APIC_IRQ(irq)))
 913                                 continue;
 914
 915                         if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
 916                                 return irq;
 917                         /*
 918                          * Use the first all-but-pin matching entry as a
 919                          * best-guess fuzzy result for broken mptables.
 920                          */
 921                         if (best_guess < 0)
 922                                 best_guess = irq;
 923                 }
 924         }
 925         return best_guess;
 926 }
 927 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
 928
 929 /*
 930  * This function currently is only a helper for the i386 smp boot process where
 931  * we need to reprogram the ioredtbls to cater for the cpus which have come online
 932  * so mask in all cases should simply be TARGET_CPUS
 933  */
 934 #ifdef CONFIG_SMP
 935 void __init setup_ioapic_dest(void)
 936 {
 937         int pin, ioapic, irq, irq_entry;
 938
 939         if (skip_ioapic_setup == 1)
 940                 return;
 941
 942         for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
 943                 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
 944                         irq_entry = find_irq_entry(ioapic, pin, mp_INT);
 945                         if (irq_entry == -1)
 946                                 continue;
 947                         irq = pin_2_irq(irq_entry, ioapic, pin);
 948                         set_ioapic_affinity_irq(irq, TARGET_CPUS);
 949                 }
 950
 951         }
 952 }
 953 #endif
 954
 955 /*
 956  * EISA Edge/Level control register, ELCR
 957  */
 958 static int EISA_ELCR(unsigned int irq)
 959 {
 960         if (irq < 16) {
 961                 unsigned int port = 0x4d0 + (irq >> 3);
 962                 return (inb(port) >> (irq & 7)) & 1;
 963         }
 964         apic_printk(APIC_VERBOSE, KERN_INFO
 965                         "Broken MPtable reports ISA irq %d\n", irq);
 966         return 0;
 967 }
 968
 969 /* EISA interrupts are always polarity zero and can be edge or level
 970  * trigger depending on the ELCR value.  If an interrupt is listed as
 971  * EISA conforming in the MP table, that means its trigger type must
 972  * be read in from the ELCR */
 973
 974 #define default_EISA_trigger(idx)       (EISA_ELCR(mp_irqs[idx].mpc_srcbusirq))
 975 #define default_EISA_polarity(idx)      (0)
 976
 977 /* ISA interrupts are always polarity zero edge triggered,
 978  * when listed as conforming in the MP table. */
 979
 980 #define default_ISA_trigger(idx)        (0)
 981 #define default_ISA_polarity(idx)       (0)
 982
 983 /* PCI interrupts are always polarity one level triggered,
 984  * when listed as conforming in the MP table. */
 985
 986 #define default_PCI_trigger(idx)        (1)
 987 #define default_PCI_polarity(idx)       (1)
 988
 989 /* MCA interrupts are always polarity zero level triggered,
 990  * when listed as conforming in the MP table. */
 991
 992 #define default_MCA_trigger(idx)        (1)
 993 #define default_MCA_polarity(idx)       (0)
 994
 995 static int __init MPBIOS_polarity(int idx)
 996 {
 997         int bus = mp_irqs[idx].mpc_srcbus;
 998         int polarity;
 999
1000         /*
1001          * Determine IRQ line polarity (high active or low active):
1002          */
1003         switch (mp_irqs[idx].mpc_irqflag & 3)
1004         {
1005                 case 0: /* conforms, ie. bus-type dependent polarity */
1006                 {
1007                         switch (mp_bus_id_to_type[bus])
1008                         {
1009                                 case MP_BUS_ISA: /* ISA pin */
1010                                 {
1011                                         polarity = default_ISA_polarity(idx);
1012                                         break;
1013                                 }
1014                                 case MP_BUS_EISA: /* EISA pin */
1015                                 {
1016                                         polarity = default_EISA_polarity(idx);
1017                                         break;
1018                                 }
1019                                 case MP_BUS_PCI: /* PCI pin */
1020                                 {
1021                                         polarity = default_PCI_polarity(idx);
1022                                         break;
1023                                 }
1024                                 case MP_BUS_MCA: /* MCA pin */
1025                                 {
1026                                         polarity = default_MCA_polarity(idx);
1027                                         break;
1028                                 }
1029                                 default:
1030                                 {
1031                                         printk(KERN_WARNING "broken BIOS!!\n");
1032                                         polarity = 1;
1033                                         break;
1034                                 }
1035                         }
1036                         break;
1037                 }
1038                 case 1: /* high active */
1039                 {
1040                         polarity = 0;
1041                         break;
1042                 }
1043                 case 2: /* reserved */
1044                 {
1045                         printk(KERN_WARNING "broken BIOS!!\n");
1046                         polarity = 1;
1047                         break;
1048                 }
1049                 case 3: /* low active */
1050                 {
1051                         polarity = 1;
1052                         break;
1053                 }
1054                 default: /* invalid */
1055                 {
1056                         printk(KERN_WARNING "broken BIOS!!\n");
1057                         polarity = 1;
1058                         break;
1059                 }
1060         }
1061         return polarity;
1062 }
1063
1064 static int MPBIOS_trigger(int idx)
1065 {
1066         int bus = mp_irqs[idx].mpc_srcbus;
1067         int trigger;
1068
1069         /*
1070          * Determine IRQ trigger mode (edge or level sensitive):
1071          */
1072         switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
1073         {
1074                 case 0: /* conforms, ie. bus-type dependent */
1075                 {
1076                         switch (mp_bus_id_to_type[bus])
1077                         {
1078                                 case MP_BUS_ISA: /* ISA pin */
1079                                 {
1080                                         trigger = default_ISA_trigger(idx);
1081                                         break;
1082                                 }
1083                                 case MP_BUS_EISA: /* EISA pin */
1084                                 {
1085                                         trigger = default_EISA_trigger(idx);
1086                                         break;
1087                                 }
1088                                 case MP_BUS_PCI: /* PCI pin */
1089                                 {
1090                                         trigger = default_PCI_trigger(idx);
1091                                         break;
1092                                 }
1093                                 case MP_BUS_MCA: /* MCA pin */
1094                                 {
1095                                         trigger = default_MCA_trigger(idx);
1096                                         break;
1097                                 }
1098                                 default:
1099                                 {
1100                                         printk(KERN_WARNING "broken BIOS!!\n");
1101                                         trigger = 1;
1102                                         break;
1103                                 }
1104                         }
1105                         break;
1106                 }
1107                 case 1: /* edge */
1108                 {
1109                         trigger = 0;
1110                         break;
1111                 }
1112                 case 2: /* reserved */
1113                 {
1114                         printk(KERN_WARNING "broken BIOS!!\n");
1115                         trigger = 1;
1116                         break;
1117                 }
1118                 case 3: /* level */
1119                 {
1120                         trigger = 1;
1121                         break;
1122                 }
1123                 default: /* invalid */
1124                 {
1125                         printk(KERN_WARNING "broken BIOS!!\n");
1126                         trigger = 0;
1127                         break;
1128                 }
1129         }
1130         return trigger;
1131 }
1132
1133 static inline int irq_polarity(int idx)
1134 {
1135         return MPBIOS_polarity(idx);
1136 }
1137
1138 static inline int irq_trigger(int idx)
1139 {
1140         return MPBIOS_trigger(idx);
1141 }
1142
1143 static int pin_2_irq(int idx, int apic, int pin)
1144 {
1145         int irq, i;
1146         int bus = mp_irqs[idx].mpc_srcbus;
1147
1148         /*
1149          * Debugging check, we are in big trouble if this message pops up!
1150          */
1151         if (mp_irqs[idx].mpc_dstirq != pin)
1152                 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
1153
1154         switch (mp_bus_id_to_type[bus])
1155         {
1156                 case MP_BUS_ISA: /* ISA pin */
1157                 case MP_BUS_EISA:
1158                 case MP_BUS_MCA:
1159                 {
1160                         irq = mp_irqs[idx].mpc_srcbusirq;
1161                         break;
1162                 }
1163                 case MP_BUS_PCI: /* PCI pin */
1164                 {
1165                         /*
1166                          * PCI IRQs are mapped in order
1167                          */
1168                         i = irq = 0;
1169                         while (i < apic)
1170                                 irq += nr_ioapic_registers[i++];
1171                         irq += pin;
1172
1173                         /*
1174                          * For MPS mode, so far only needed by ES7000 platform
1175                          */
1176                         if (ioapic_renumber_irq)
1177                                 irq = ioapic_renumber_irq(apic, irq);
1178
1179                         break;
1180                 }
1181                 default:
1182                 {
1183                         printk(KERN_ERR "unknown bus type %d.\n",bus);
1184                         irq = 0;
1185                         break;
1186                 }
1187         }
1188
1189         /*
1190          * PCI IRQ command line redirection. Yes, limits are hardcoded.
1191          */
1192         if ((pin >= 16) && (pin <= 23)) {
1193                 if (pirq_entries[pin-16] != -1) {
1194                         if (!pirq_entries[pin-16]) {
1195                                 apic_printk(APIC_VERBOSE, KERN_DEBUG
1196                                                 "disabling PIRQ%d\n", pin-16);
1197                         } else {
1198                                 irq = pirq_entries[pin-16];
1199                                 apic_printk(APIC_VERBOSE, KERN_DEBUG
1200                                                 "using PIRQ%d -> IRQ %d\n",
1201                                                 pin-16, irq);
1202                         }
1203                 }
1204         }
1205         return irq;
1206 }
1207
1208 static inline int IO_APIC_irq_trigger(int irq)
1209 {
1210         int apic, idx, pin;
1211
1212         for (apic = 0; apic < nr_ioapics; apic++) {
1213                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1214                         idx = find_irq_entry(apic,pin,mp_INT);
1215                         if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin)))
1216                                 return irq_trigger(idx);
1217                 }
1218         }
1219         /*
1220          * nonexistent IRQs are edge default
1221          */
1222         return 0;
1223 }
1224
1225 /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
1226 static u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
1227
1228 static int __assign_irq_vector(int irq)
1229 {
1230         static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
1231         int vector, offset, i;
1232
1233         BUG_ON((unsigned)irq >= NR_IRQ_VECTORS);
1234
1235         if (irq_vector[irq] > 0)
1236                 return irq_vector[irq];
1237
1238         vector = current_vector;
1239         offset = current_offset;
1240 next:
1241         vector += 8;
1242         if (vector >= FIRST_SYSTEM_VECTOR) {
1243                 offset = (offset + 1) % 8;
1244                 vector = FIRST_DEVICE_VECTOR + offset;
1245         }
1246         if (vector == current_vector)
1247                 return -ENOSPC;
1248         if (vector == SYSCALL_VECTOR)
1249                 goto next;
1250         for (i = 0; i < NR_IRQ_VECTORS; i++)
1251                 if (irq_vector[i] == vector)
1252                         goto next;
1253
1254         current_vector = vector;
1255         current_offset = offset;
1256         irq_vector[irq] = vector;
1257
1258         return vector;
1259 }
1260
1261 static int assign_irq_vector(int irq)
1262 {
1263         unsigned long flags;
1264         int vector;
1265
1266         spin_lock_irqsave(&vector_lock, flags);
1267         vector = __assign_irq_vector(irq);
1268         spin_unlock_irqrestore(&vector_lock, flags);
1269
1270         return vector;
1271 }
1272 static struct irq_chip ioapic_chip;
1273
1274 #define IOAPIC_AUTO     -1
1275 #define IOAPIC_EDGE     0
1276 #define IOAPIC_LEVEL    1
1277
1278 static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
1279 {
1280         if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1281                         trigger == IOAPIC_LEVEL)
1282                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1283                                          handle_fasteoi_irq, "fasteoi");
1284         else {
1285                 irq_desc[irq].status |= IRQ_DELAYED_DISABLE;
1286                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1287                                          handle_edge_irq, "edge");
1288         }
1289         set_intr_gate(vector, interrupt[irq]);
1290 }
1291
1292 static void __init setup_IO_APIC_irqs(void)
1293 {
1294         struct IO_APIC_route_entry entry;
1295         int apic, pin, idx, irq, first_notcon = 1, vector;
1296         unsigned long flags;
1297
1298         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1299
1300         for (apic = 0; apic < nr_ioapics; apic++) {
1301         for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1302
1303                 /*
1304                  * add it to the IO-APIC irq-routing table:
1305                  */
1306                 memset(&entry,0,sizeof(entry));
1307
1308                 entry.delivery_mode = INT_DELIVERY_MODE;
1309                 entry.dest_mode = INT_DEST_MODE;
1310                 entry.mask = 0;                         /* enable IRQ */
1311                 entry.dest.logical.logical_dest =
1312                                         cpu_mask_to_apicid(TARGET_CPUS);
1313
1314                 idx = find_irq_entry(apic,pin,mp_INT);
1315                 if (idx == -1) {
1316                         if (first_notcon) {
1317                                 apic_printk(APIC_VERBOSE, KERN_DEBUG
1318                                                 " IO-APIC (apicid-pin) %d-%d",
1319                                                 mp_ioapics[apic].mpc_apicid,
1320                                                 pin);
1321                                 first_notcon = 0;
1322                         } else
1323                                 apic_printk(APIC_VERBOSE, ", %d-%d",
1324                                         mp_ioapics[apic].mpc_apicid, pin);
1325                         continue;
1326                 }
1327
1328                 entry.trigger = irq_trigger(idx);
1329                 entry.polarity = irq_polarity(idx);
1330
1331                 if (irq_trigger(idx)) {
1332                         entry.trigger = 1;
1333                         entry.mask = 1;
1334                 }
1335
1336                 irq = pin_2_irq(idx, apic, pin);
1337                 /*
1338                  * skip adding the timer int on secondary nodes, which causes
1339                  * a small but painful rift in the time-space continuum
1340                  */
1341                 if (multi_timer_check(apic, irq))
1342                         continue;
1343                 else
1344                         add_pin_to_irq(irq, apic, pin);
1345
1346                 if (!apic && !IO_APIC_IRQ(irq))
1347                         continue;
1348
1349                 if (IO_APIC_IRQ(irq)) {
1350                         vector = assign_irq_vector(irq);
1351                         entry.vector = vector;
1352                         ioapic_register_intr(irq, vector, IOAPIC_AUTO);
1353
1354                         if (!apic && (irq < 16))
1355                                 disable_8259A_irq(irq);
1356                 }
1357                 spin_lock_irqsave(&ioapic_lock, flags);
1358                 __ioapic_write_entry(apic, pin, entry);
1359                 set_native_irq_info(irq, TARGET_CPUS);
1360                 spin_unlock_irqrestore(&ioapic_lock, flags);
1361         }
1362         }
1363
1364         if (!first_notcon)
1365                 apic_printk(APIC_VERBOSE, " not connected.\n");
1366 }
1367
1368 /*
1369  * Set up the 8259A-master output pin:
1370  */
1371 static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
1372 {
1373         struct IO_APIC_route_entry entry;
1374
1375         memset(&entry,0,sizeof(entry));
1376
1377         disable_8259A_irq(0);
1378
1379         /* mask LVT0 */
1380         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1381
1382         /*
1383          * We use logical delivery to get the timer IRQ
1384          * to the first CPU.
1385          */
1386         entry.dest_mode = INT_DEST_MODE;
1387         entry.mask = 0;                                 /* unmask IRQ now */
1388         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
1389         entry.delivery_mode = INT_DELIVERY_MODE;
1390         entry.polarity = 0;
1391         entry.trigger = 0;
1392         entry.vector = vector;
1393
1394         /*
1395          * The timer IRQ doesn't have to know that behind the
1396          * scene we have a 8259A-master in AEOI mode ...
1397          */
1398         irq_desc[0].chip = &ioapic_chip;
1399         set_irq_handler(0, handle_edge_irq);
1400
1401         /*
1402          * Add it to the IO-APIC irq-routing table:
1403          */
1404         ioapic_write_entry(apic, pin, entry);
1405
1406         enable_8259A_irq(0);
1407 }
1408
1409 static inline void UNEXPECTED_IO_APIC(void)
1410 {
1411 }
1412
1413 void __init print_IO_APIC(void)
1414 {
1415         int apic, i;
1416         union IO_APIC_reg_00 reg_00;
1417         union IO_APIC_reg_01 reg_01;
1418         union IO_APIC_reg_02 reg_02;
1419         union IO_APIC_reg_03 reg_03;
1420         unsigned long flags;
1421
1422         if (apic_verbosity == APIC_QUIET)
1423                 return;
1424
1425         printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1426         for (i = 0; i < nr_ioapics; i++)
1427                 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1428                        mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
1429
1430         /*
1431          * We are a bit conservative about what we expect.  We have to
1432          * know about every hardware change ASAP.
1433          */
1434         printk(KERN_INFO "testing the IO APIC.......................\n");
1435
1436         for (apic = 0; apic < nr_ioapics; apic++) {
1437
1438         spin_lock_irqsave(&ioapic_lock, flags);
1439         reg_00.raw = io_apic_read(apic, 0);
1440         reg_01.raw = io_apic_read(apic, 1);
1441         if (reg_01.bits.version >= 0x10)
1442                 reg_02.raw = io_apic_read(apic, 2);
1443         if (reg_01.bits.version >= 0x20)
1444                 reg_03.raw = io_apic_read(apic, 3);
1445         spin_unlock_irqrestore(&ioapic_lock, flags);
1446
1447         printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
1448         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1449         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
1450         printk(KERN_DEBUG ".......    : Delivery Type: %X\n", reg_00.bits.delivery_type);
1451         printk(KERN_DEBUG ".......    : LTS          : %X\n", reg_00.bits.LTS);
1452         if (reg_00.bits.ID >= get_physical_broadcast())
1453                 UNEXPECTED_IO_APIC();
1454         if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
1455                 UNEXPECTED_IO_APIC();
1456
1457         printk(KERN_DEBUG ".... register #01: %08X\n", reg_01.raw);
1458         printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);
1459         if (    (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
1460                 (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
1461                 (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
1462                 (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
1463                 (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
1464                 (reg_01.bits.entries != 0x2E) &&
1465                 (reg_01.bits.entries != 0x3F)
1466         )
1467                 UNEXPECTED_IO_APIC();
1468
1469         printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
1470         printk(KERN_DEBUG ".......     : IO APIC version: %04X\n", reg_01.bits.version);
1471         if (    (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
1472                 (reg_01.bits.version != 0x10) && /* oldest IO-APICs */
1473                 (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
1474                 (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
1475                 (reg_01.bits.version != 0x20)    /* Intel P64H (82806 AA) */
1476         )
1477                 UNEXPECTED_IO_APIC();
1478         if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
1479                 UNEXPECTED_IO_APIC();
1480
1481         /*
1482          * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1483          * but the value of reg_02 is read as the previous read register
1484          * value, so ignore it if reg_02 == reg_01.
1485          */
1486         if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1487                 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1488                 printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
1489                 if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
1490                         UNEXPECTED_IO_APIC();
1491         }
1492
1493         /*
1494          * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1495          * or reg_03, but the value of reg_0[23] is read as the previous read
1496          * register value, so ignore it if reg_03 == reg_0[12].
1497          */
1498         if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1499             reg_03.raw != reg_01.raw) {
1500                 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1501                 printk(KERN_DEBUG ".......     : Boot DT    : %X\n", reg_03.bits.boot_DT);
1502                 if (reg_03.bits.__reserved_1)
1503                         UNEXPECTED_IO_APIC();
1504         }
1505
1506         printk(KERN_DEBUG ".... IRQ redirection table:\n");
1507
1508         printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol"
1509                           " Stat Dest Deli Vect:   \n");
1510
1511         for (i = 0; i <= reg_01.bits.entries; i++) {
1512                 struct IO_APIC_route_entry entry;
1513
1514                 entry = ioapic_read_entry(apic, i);
1515
1516                 printk(KERN_DEBUG " %02x %03X %02X  ",
1517                         i,
1518                         entry.dest.logical.logical_dest,
1519                         entry.dest.physical.physical_dest
1520                 );
1521
1522                 printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
1523                         entry.mask,
1524                         entry.trigger,
1525                         entry.irr,
1526                         entry.polarity,
1527                         entry.delivery_status,
1528                         entry.dest_mode,
1529                         entry.delivery_mode,
1530                         entry.vector
1531                 );
1532         }
1533         }
1534         printk(KERN_DEBUG "IRQ to pin mappings:\n");
1535         for (i = 0; i < NR_IRQS; i++) {
1536                 struct irq_pin_list *entry = irq_2_pin + i;
1537                 if (entry->pin < 0)
1538                         continue;
1539                 printk(KERN_DEBUG "IRQ%d ", i);
1540                 for (;;) {
1541                         printk("-> %d:%d", entry->apic, entry->pin);
1542                         if (!entry->next)
1543                                 break;
1544                         entry = irq_2_pin + entry->next;
1545                 }
1546                 printk("\n");
1547         }
1548
1549         printk(KERN_INFO ".................................... done.\n");
1550
1551         return;
1552 }
1553
1554 #if 0
1555
1556 static void print_APIC_bitfield (int base)
1557 {
1558         unsigned int v;
1559         int i, j;
1560
1561         if (apic_verbosity == APIC_QUIET)
1562                 return;
1563
1564         printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1565         for (i = 0; i < 8; i++) {
1566                 v = apic_read(base + i*0x10);
1567                 for (j = 0; j < 32; j++) {
1568                         if (v & (1<<j))
1569                                 printk("1");
1570                         else
1571                                 printk("0");
1572                 }
1573                 printk("\n");
1574         }
1575 }
1576
1577 void /*__init*/ print_local_APIC(void * dummy)
1578 {
1579         unsigned int v, ver, maxlvt;
1580
1581         if (apic_verbosity == APIC_QUIET)
1582                 return;
1583
1584         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1585                 smp_processor_id(), hard_smp_processor_id());
1586         v = apic_read(APIC_ID);
1587         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(v));
1588         v = apic_read(APIC_LVR);
1589         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1590         ver = GET_APIC_VERSION(v);
1591         maxlvt = get_maxlvt();
1592
1593         v = apic_read(APIC_TASKPRI);
1594         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1595
1596         if (APIC_INTEGRATED(ver)) {                     /* !82489DX */
1597                 v = apic_read(APIC_ARBPRI);
1598                 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1599                         v & APIC_ARBPRI_MASK);
1600                 v = apic_read(APIC_PROCPRI);
1601                 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1602         }
1603
1604         v = apic_read(APIC_EOI);
1605         printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1606         v = apic_read(APIC_RRR);
1607         printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1608         v = apic_read(APIC_LDR);
1609         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1610         v = apic_read(APIC_DFR);
1611         printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1612         v = apic_read(APIC_SPIV);
1613         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1614
1615         printk(KERN_DEBUG "... APIC ISR field:\n");
1616         print_APIC_bitfield(APIC_ISR);
1617         printk(KERN_DEBUG "... APIC TMR field:\n");
1618         print_APIC_bitfield(APIC_TMR);
1619         printk(KERN_DEBUG "... APIC IRR field:\n");
1620         print_APIC_bitfield(APIC_IRR);
1621
1622         if (APIC_INTEGRATED(ver)) {             /* !82489DX */
1623                 if (maxlvt > 3)         /* Due to the Pentium erratum 3AP. */
1624                         apic_write(APIC_ESR, 0);
1625                 v = apic_read(APIC_ESR);
1626                 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1627         }
1628
1629         v = apic_read(APIC_ICR);
1630         printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1631         v = apic_read(APIC_ICR2);
1632         printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1633
1634         v = apic_read(APIC_LVTT);
1635         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1636
1637         if (maxlvt > 3) {                       /* PC is LVT#4. */
1638                 v = apic_read(APIC_LVTPC);
1639                 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1640         }
1641         v = apic_read(APIC_LVT0);
1642         printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1643         v = apic_read(APIC_LVT1);
1644         printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1645
1646         if (maxlvt > 2) {                       /* ERR is LVT#3. */
1647                 v = apic_read(APIC_LVTERR);
1648                 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1649         }
1650
1651         v = apic_read(APIC_TMICT);
1652         printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1653         v = apic_read(APIC_TMCCT);
1654         printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1655         v = apic_read(APIC_TDCR);
1656         printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1657         printk("\n");
1658 }
1659
1660 void print_all_local_APICs (void)
1661 {
1662         on_each_cpu(print_local_APIC, NULL, 1, 1);
1663 }
1664
1665 void /*__init*/ print_PIC(void)
1666 {
1667         unsigned int v;
1668         unsigned long flags;
1669
1670         if (apic_verbosity == APIC_QUIET)
1671                 return;
1672
1673         printk(KERN_DEBUG "\nprinting PIC contents\n");
1674
1675         spin_lock_irqsave(&i8259A_lock, flags);
1676
1677         v = inb(0xa1) << 8 | inb(0x21);
1678         printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
1679
1680         v = inb(0xa0) << 8 | inb(0x20);
1681         printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
1682
1683         outb(0x0b,0xa0);
1684         outb(0x0b,0x20);
1685         v = inb(0xa0) << 8 | inb(0x20);
1686         outb(0x0a,0xa0);
1687         outb(0x0a,0x20);
1688
1689         spin_unlock_irqrestore(&i8259A_lock, flags);
1690
1691         printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
1692
1693         v = inb(0x4d1) << 8 | inb(0x4d0);
1694         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1695 }
1696
1697 #endif  /*  0  */
1698
1699 static void __init enable_IO_APIC(void)
1700 {
1701         union IO_APIC_reg_01 reg_01;
1702         int i8259_apic, i8259_pin;
1703         int i, apic;
1704         unsigned long flags;
1705
1706         for (i = 0; i < PIN_MAP_SIZE; i++) {
1707                 irq_2_pin[i].pin = -1;
1708                 irq_2_pin[i].next = 0;
1709         }
1710         if (!pirqs_enabled)
1711                 for (i = 0; i < MAX_PIRQS; i++)
1712                         pirq_entries[i] = -1;
1713
1714         /*
1715          * The number of IO-APIC IRQ registers (== #pins):
1716          */
1717         for (apic = 0; apic < nr_ioapics; apic++) {
1718                 spin_lock_irqsave(&ioapic_lock, flags);
1719                 reg_01.raw = io_apic_read(apic, 1);
1720                 spin_unlock_irqrestore(&ioapic_lock, flags);
1721                 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1722         }
1723         for(apic = 0; apic < nr_ioapics; apic++) {
1724                 int pin;
1725                 /* See if any of the pins is in ExtINT mode */
1726                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1727                         struct IO_APIC_route_entry entry;
1728                         entry = ioapic_read_entry(apic, pin);
1729
1730
1731                         /* If the interrupt line is enabled and in ExtInt mode
1732                          * I have found the pin where the i8259 is connected.
1733                          */
1734                         if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1735                                 ioapic_i8259.apic = apic;
1736                                 ioapic_i8259.pin  = pin;
1737                                 goto found_i8259;
1738                         }
1739                 }
1740         }
1741  found_i8259:
1742         /* Look to see what if the MP table has reported the ExtINT */
1743         /* If we could not find the appropriate pin by looking at the ioapic
1744          * the i8259 probably is not connected the ioapic but give the
1745          * mptable a chance anyway.
1746          */
1747         i8259_pin  = find_isa_irq_pin(0, mp_ExtINT);
1748         i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1749         /* Trust the MP table if nothing is setup in the hardware */
1750         if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1751                 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1752                 ioapic_i8259.pin  = i8259_pin;
1753                 ioapic_i8259.apic = i8259_apic;
1754         }
1755         /* Complain if the MP table and the hardware disagree */
1756         if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1757                 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1758         {
1759                 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1760         }
1761
1762         /*
1763          * Do not trust the IO-APIC being empty at bootup
1764          */
1765         clear_IO_APIC();
1766 }
1767
1768 /*
1769  * Not an __init, needed by the reboot code
1770  */
1771 void disable_IO_APIC(void)
1772 {
1773         /*
1774          * Clear the IO-APIC before rebooting:
1775          */
1776         clear_IO_APIC();
1777
1778         /*
1779          * If the i8259 is routed through an IOAPIC
1780          * Put that IOAPIC in virtual wire mode
1781          * so legacy interrupts can be delivered.
1782          */
1783         if (ioapic_i8259.pin != -1) {
1784                 struct IO_APIC_route_entry entry;
1785
1786                 memset(&entry, 0, sizeof(entry));
1787                 entry.mask            = 0; /* Enabled */
1788                 entry.trigger         = 0; /* Edge */
1789                 entry.irr             = 0;
1790                 entry.polarity        = 0; /* High */
1791                 entry.delivery_status = 0;
1792                 entry.dest_mode       = 0; /* Physical */
1793                 entry.delivery_mode   = dest_ExtINT; /* ExtInt */
1794                 entry.vector          = 0;
1795                 entry.dest.physical.physical_dest =
1796                                         GET_APIC_ID(apic_read(APIC_ID));
1797
1798                 /*
1799                  * Add it to the IO-APIC irq-routing table:
1800                  */
1801                 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1802         }
1803         disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1804 }
1805
1806 /*
1807  * function to set the IO-APIC physical IDs based on the
1808  * values stored in the MPC table.
1809  *
1810  * by Matt Domsch <Matt_Domsch@dell.com>  Tue Dec 21 12:25:05 CST 1999
1811  */
1812
1813 #ifndef CONFIG_X86_NUMAQ
1814 static void __init setup_ioapic_ids_from_mpc(void)
1815 {
1816         union IO_APIC_reg_00 reg_00;
1817         physid_mask_t phys_id_present_map;
1818         int apic;
1819         int i;
1820         unsigned char old_id;
1821         unsigned long flags;
1822
1823         /*
1824          * Don't check I/O APIC IDs for xAPIC systems.  They have
1825          * no meaning without the serial APIC bus.
1826          */
1827         if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
1828                 || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
1829                 return;
1830         /*
1831          * This is broken; anything with a real cpu count has to
1832          * circumvent this idiocy regardless.
1833          */
1834         phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map);
1835
1836         /*
1837          * Set the IOAPIC ID to the value stored in the MPC table.
1838          */
1839         for (apic = 0; apic < nr_ioapics; apic++) {
1840
1841                 /* Read the register 0 value */
1842                 spin_lock_irqsave(&ioapic_lock, flags);
1843                 reg_00.raw = io_apic_read(apic, 0);
1844                 spin_unlock_irqrestore(&ioapic_lock, flags);
1845
1846                 old_id = mp_ioapics[apic].mpc_apicid;
1847
1848                 if (mp_ioapics[apic].mpc_apicid >= get_physical_broadcast()) {
1849                         printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
1850                                 apic, mp_ioapics[apic].mpc_apicid);
1851                         printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1852                                 reg_00.bits.ID);
1853                         mp_ioapics[apic].mpc_apicid = reg_00.bits.ID;
1854                 }
1855
1856                 /*
1857                  * Sanity check, is the ID really free? Every APIC in a
1858                  * system must have a unique ID or we get lots of nice
1859                  * 'stuck on smp_invalidate_needed IPI wait' messages.
1860                  */
1861                 if (check_apicid_used(phys_id_present_map,
1862                                         mp_ioapics[apic].mpc_apicid)) {
1863                         printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
1864                                 apic, mp_ioapics[apic].mpc_apicid);
1865                         for (i = 0; i < get_physical_broadcast(); i++)
1866                                 if (!physid_isset(i, phys_id_present_map))
1867                                         break;
1868                         if (i >= get_physical_broadcast())
1869                                 panic("Max APIC ID exceeded!\n");
1870                         printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1871                                 i);
1872                         physid_set(i, phys_id_present_map);
1873                         mp_ioapics[apic].mpc_apicid = i;
1874                 } else {
1875                         physid_mask_t tmp;
1876                         tmp = apicid_to_cpu_present(mp_ioapics[apic].mpc_apicid);
1877                         apic_printk(APIC_VERBOSE, "Setting %d in the "
1878                                         "phys_id_present_map\n",
1879                                         mp_ioapics[apic].mpc_apicid);
1880                         physids_or(phys_id_present_map, phys_id_present_map, tmp);
1881                 }
1882
1883
1884                 /*
1885                  * We need to adjust the IRQ routing table
1886                  * if the ID changed.
1887                  */
1888                 if (old_id != mp_ioapics[apic].mpc_apicid)
1889                         for (i = 0; i < mp_irq_entries; i++)
1890                                 if (mp_irqs[i].mpc_dstapic == old_id)
1891                                         mp_irqs[i].mpc_dstapic
1892                                                 = mp_ioapics[apic].mpc_apicid;
1893
1894                 /*
1895                  * Read the right value from the MPC table and
1896                  * write it into the ID register.
1897                  */
1898                 apic_printk(APIC_VERBOSE, KERN_INFO
1899                         "...changing IO-APIC physical APIC ID to %d ...",
1900                         mp_ioapics[apic].mpc_apicid);
1901
1902                 reg_00.bits.ID = mp_ioapics[apic].mpc_apicid;
1903                 spin_lock_irqsave(&ioapic_lock, flags);
1904                 io_apic_write(apic, 0, reg_00.raw);
1905                 spin_unlock_irqrestore(&ioapic_lock, flags);
1906
1907                 /*
1908                  * Sanity check
1909                  */
1910                 spin_lock_irqsave(&ioapic_lock, flags);
1911                 reg_00.raw = io_apic_read(apic, 0);
1912                 spin_unlock_irqrestore(&ioapic_lock, flags);
1913                 if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid)
1914                         printk("could not set ID!\n");
1915                 else
1916                         apic_printk(APIC_VERBOSE, " ok.\n");
1917         }
1918 }
1919 #else
1920 static void __init setup_ioapic_ids_from_mpc(void) { }
1921 #endif
1922
1923 static int no_timer_check __initdata;
1924
1925 static int __init notimercheck(char *s)
1926 {
1927         no_timer_check = 1;
1928         return 1;
1929 }
1930 __setup("no_timer_check", notimercheck);
1931
1932 /*
1933  * There is a nasty bug in some older SMP boards, their mptable lies
1934  * about the timer IRQ. We do the following to work around the situation:
1935  *
1936  *      - timer IRQ defaults to IO-APIC IRQ
1937  *      - if this function detects that timer IRQs are defunct, then we fall
1938  *        back to ISA timer IRQs
1939  */
1940 int __init timer_irq_works(void)
1941 {
1942         unsigned long t1 = jiffies;
1943
1944         if (no_timer_check)
1945                 return 1;
1946
1947         local_irq_enable();
1948         /* Let ten ticks pass... */
1949         mdelay((10 * 1000) / HZ);
1950
1951         /*
1952          * Expect a few ticks at least, to be sure some possible
1953          * glue logic does not lock up after one or two first
1954          * ticks in a non-ExtINT mode.  Also the local APIC
1955          * might have cached one ExtINT interrupt.  Finally, at
1956          * least one tick may be lost due to delays.
1957          */
1958         if (jiffies - t1 > 4)
1959                 return 1;
1960
1961         return 0;
1962 }
1963
1964 /*
1965  * In the SMP+IOAPIC case it might happen that there are an unspecified
1966  * number of pending IRQ events unhandled. These cases are very rare,
1967  * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1968  * better to do it this way as thus we do not have to be aware of
1969  * 'pending' interrupts in the IRQ path, except at this point.
1970  */
1971 /*
1972  * Edge triggered needs to resend any interrupt
1973  * that was delayed but this is now handled in the device
1974  * independent code.
1975  */
1976
1977 /*
1978  * Startup quirk:
1979  *
1980  * Starting up a edge-triggered IO-APIC interrupt is
1981  * nasty - we need to make sure that we get the edge.
1982  * If it is already asserted for some reason, we need
1983  * return 1 to indicate that is was pending.
1984  *
1985  * This is not complete - we should be able to fake
1986  * an edge even if it isn't on the 8259A...
1987  *
1988  * (We do this for level-triggered IRQs too - it cannot hurt.)
1989  */
1990 static unsigned int startup_ioapic_irq(unsigned int irq)
1991 {
1992         int was_pending = 0;
1993         unsigned long flags;
1994
1995         spin_lock_irqsave(&ioapic_lock, flags);
1996         if (irq < 16) {
1997                 disable_8259A_irq(irq);
1998                 if (i8259A_irq_pending(irq))
1999                         was_pending = 1;
2000         }
2001         __unmask_IO_APIC_irq(irq);
2002         spin_unlock_irqrestore(&ioapic_lock, flags);
2003
2004         return was_pending;
2005 }
2006
2007 static void ack_ioapic_irq(unsigned int irq)
2008 {
2009         move_native_irq(irq);
2010         ack_APIC_irq();
2011 }
2012
2013 static void ack_ioapic_quirk_irq(unsigned int irq)
2014 {
2015         unsigned long v;
2016         int i;
2017
2018         move_native_irq(irq);
2019 /*
2020  * It appears there is an erratum which affects at least version 0x11
2021  * of I/O APIC (that's the 82093AA and cores integrated into various
2022  * chipsets).  Under certain conditions a level-triggered interrupt is
2023  * erroneously delivered as edge-triggered one but the respective IRR
2024  * bit gets set nevertheless.  As a result the I/O unit expects an EOI
2025  * message but it will never arrive and further interrupts are blocked
2026  * from the source.  The exact reason is so far unknown, but the
2027  * phenomenon was observed when two consecutive interrupt requests
2028  * from a given source get delivered to the same CPU and the source is
2029  * temporarily disabled in between.
2030  *
2031  * A workaround is to simulate an EOI message manually.  We achieve it
2032  * by setting the trigger mode to edge and then to level when the edge
2033  * trigger mode gets detected in the TMR of a local APIC for a
2034  * level-triggered interrupt.  We mask the source for the time of the
2035  * operation to prevent an edge-triggered interrupt escaping meanwhile.
2036  * The idea is from Manfred Spraul.  --macro
2037  */
2038         i = irq_vector[irq];
2039
2040         v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
2041
2042         ack_APIC_irq();
2043
2044         if (!(v & (1 << (i & 0x1f)))) {
2045                 atomic_inc(&irq_mis_count);
2046                 spin_lock(&ioapic_lock);
2047                 __mask_and_edge_IO_APIC_irq(irq);
2048                 __unmask_and_level_IO_APIC_irq(irq);
2049                 spin_unlock(&ioapic_lock);
2050         }
2051 }
2052
2053 static int ioapic_retrigger_irq(unsigned int irq)
2054 {
2055         send_IPI_self(irq_vector[irq]);
2056
2057         return 1;
2058 }
2059
2060 static struct irq_chip ioapic_chip __read_mostly = {
2061         .name           = "IO-APIC",
2062         .startup        = startup_ioapic_irq,
2063         .mask           = mask_IO_APIC_irq,
2064         .unmask         = unmask_IO_APIC_irq,
2065         .ack            = ack_ioapic_irq,
2066         .eoi            = ack_ioapic_quirk_irq,
2067 #ifdef CONFIG_SMP
2068         .set_affinity   = set_ioapic_affinity_irq,
2069 #endif
2070         .retrigger      = ioapic_retrigger_irq,
2071 };
2072
2073
2074 static inline void init_IO_APIC_traps(void)
2075 {
2076         int irq;
2077
2078         /*
2079          * NOTE! The local APIC isn't very good at handling
2080          * multiple interrupts at the same interrupt level.
2081          * As the interrupt level is determined by taking the
2082          * vector number and shifting that right by 4, we
2083          * want to spread these out a bit so that they don't
2084          * all fall in the same interrupt level.
2085          *
2086          * Also, we've got to be careful not to trash gate
2087          * 0x80, because int 0x80 is hm, kind of importantish. ;)
2088          */
2089         for (irq = 0; irq < NR_IRQS ; irq++) {
2090                 int tmp = irq;
2091                 if (IO_APIC_IRQ(tmp) && !irq_vector[tmp]) {
2092                         /*
2093                          * Hmm.. We don't have an entry for this,
2094                          * so default to an old-fashioned 8259
2095                          * interrupt if we can..
2096                          */
2097                         if (irq < 16)
2098                                 make_8259A_irq(irq);
2099                         else
2100                                 /* Strange. Oh, well.. */
2101                                 irq_desc[irq].chip = &no_irq_chip;
2102                 }
2103         }
2104 }
2105
2106 /*
2107  * The local APIC irq-chip implementation:
2108  */
2109
2110 static void ack_apic(unsigned int irq)
2111 {
2112         ack_APIC_irq();
2113 }
2114
2115 static void mask_lapic_irq (unsigned int irq)
2116 {
2117         unsigned long v;
2118
2119         v = apic_read(APIC_LVT0);
2120         apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED);
2121 }
2122
2123 static void unmask_lapic_irq (unsigned int irq)
2124 {
2125         unsigned long v;
2126
2127         v = apic_read(APIC_LVT0);
2128         apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED);
2129 }
2130
2131 static struct irq_chip lapic_chip __read_mostly = {
2132         .name           = "local-APIC-edge",
2133         .mask           = mask_lapic_irq,
2134         .unmask         = unmask_lapic_irq,
2135         .eoi            = ack_apic,
2136 };
2137
2138 static void setup_nmi (void)
2139 {
2140         /*
2141          * Dirty trick to enable the NMI watchdog ...
2142          * We put the 8259A master into AEOI mode and
2143          * unmask on all local APICs LVT0 as NMI.
2144          *
2145          * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2146          * is from Maciej W. Rozycki - so we do not have to EOI from
2147          * the NMI handler or the timer interrupt.
2148          */
2149         apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
2150
2151         on_each_cpu(enable_NMI_through_LVT0, NULL, 1, 1);
2152
2153         apic_printk(APIC_VERBOSE, " done.\n");
2154 }
2155
2156 /*
2157  * This looks a bit hackish but it's about the only one way of sending
2158  * a few INTA cycles to 8259As and any associated glue logic.  ICR does
2159  * not support the ExtINT mode, unfortunately.  We need to send these
2160  * cycles as some i82489DX-based boards have glue logic that keeps the
2161  * 8259A interrupt line asserted until INTA.  --macro
2162  */
2163 static inline void unlock_ExtINT_logic(void)
2164 {
2165         int apic, pin, i;
2166         struct IO_APIC_route_entry entry0, entry1;
2167         unsigned char save_control, save_freq_select;
2168
2169         pin  = find_isa_irq_pin(8, mp_INT);
2170         if (pin == -1) {
2171                 WARN_ON_ONCE(1);
2172                 return;
2173         }
2174         apic = find_isa_irq_apic(8, mp_INT);
2175         if (apic == -1) {
2176                 WARN_ON_ONCE(1);
2177                 return;
2178         }
2179
2180         entry0 = ioapic_read_entry(apic, pin);
2181         clear_IO_APIC_pin(apic, pin);
2182
2183         memset(&entry1, 0, sizeof(entry1));
2184
2185         entry1.dest_mode = 0;                   /* physical delivery */
2186         entry1.mask = 0;                        /* unmask IRQ now */
2187         entry1.dest.physical.physical_dest = hard_smp_processor_id();
2188         entry1.delivery_mode = dest_ExtINT;
2189         entry1.polarity = entry0.polarity;
2190         entry1.trigger = 0;
2191         entry1.vector = 0;
2192
2193         ioapic_write_entry(apic, pin, entry1);
2194
2195         save_control = CMOS_READ(RTC_CONTROL);
2196         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2197         CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2198                    RTC_FREQ_SELECT);
2199         CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2200
2201         i = 100;
2202         while (i-- > 0) {
2203                 mdelay(10);
2204                 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2205                         i -= 10;
2206         }
2207
2208         CMOS_WRITE(save_control, RTC_CONTROL);
2209         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2210         clear_IO_APIC_pin(apic, pin);
2211
2212         ioapic_write_entry(apic, pin, entry0);
2213 }
2214
2215 int timer_uses_ioapic_pin_0;
2216
2217 /*
2218  * This code may look a bit paranoid, but it's supposed to cooperate with
2219  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
2220  * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
2221  * fanatically on his truly buggy board.
2222  */
2223 static inline void __init check_timer(void)
2224 {
2225         int apic1, pin1, apic2, pin2;
2226         int vector;
2227
2228         /*
2229          * get/set the timer IRQ vector:
2230          */
2231         disable_8259A_irq(0);
2232         vector = assign_irq_vector(0);
2233         set_intr_gate(vector, interrupt[0]);
2234
2235         /*
2236          * Subtle, code in do_timer_interrupt() expects an AEOI
2237          * mode for the 8259A whenever interrupts are routed
2238          * through I/O APICs.  Also IRQ0 has to be enabled in
2239          * the 8259A which implies the virtual wire has to be
2240          * disabled in the local APIC.
2241          */
2242         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2243         init_8259A(1);
2244         timer_ack = 1;
2245         if (timer_over_8254 > 0)
2246                 enable_8259A_irq(0);
2247
2248         pin1  = find_isa_irq_pin(0, mp_INT);
2249         apic1 = find_isa_irq_apic(0, mp_INT);
2250         pin2  = ioapic_i8259.pin;
2251         apic2 = ioapic_i8259.apic;
2252
2253         if (pin1 == 0)
2254                 timer_uses_ioapic_pin_0 = 1;
2255
2256         printk(KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
2257                 vector, apic1, pin1, apic2, pin2);
2258
2259         if (pin1 != -1) {
2260                 /*
2261                  * Ok, does IRQ0 through the IOAPIC work?
2262                  */
2263                 unmask_IO_APIC_irq(0);
2264                 if (timer_irq_works()) {
2265                         if (nmi_watchdog == NMI_IO_APIC) {
2266                                 disable_8259A_irq(0);
2267                                 setup_nmi();
2268                                 enable_8259A_irq(0);
2269                         }
2270                         if (disable_timer_pin_1 > 0)
2271                                 clear_IO_APIC_pin(0, pin1);
2272                         return;
2273                 }
2274                 clear_IO_APIC_pin(apic1, pin1);
2275                 printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to "
2276                                 "IO-APIC\n");
2277         }
2278
2279         printk(KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... ");
2280         if (pin2 != -1) {
2281                 printk("\n..... (found pin %d) ...", pin2);
2282                 /*
2283                  * legacy devices should be connected to IO APIC #0
2284                  */
2285                 setup_ExtINT_IRQ0_pin(apic2, pin2, vector);
2286                 if (timer_irq_works()) {
2287                         printk("works.\n");
2288                         if (pin1 != -1)
2289                                 replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
2290                         else
2291                                 add_pin_to_irq(0, apic2, pin2);
2292                         if (nmi_watchdog == NMI_IO_APIC) {
2293                                 setup_nmi();
2294                         }
2295                         return;
2296                 }
2297                 /*
2298                  * Cleanup, just in case ...
2299                  */
2300                 clear_IO_APIC_pin(apic2, pin2);
2301         }
2302         printk(" failed.\n");
2303
2304         if (nmi_watchdog == NMI_IO_APIC) {
2305                 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
2306                 nmi_watchdog = 0;
2307         }
2308
2309         printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
2310
2311         disable_8259A_irq(0);
2312         set_irq_chip_and_handler_name(0, &lapic_chip, handle_fasteoi_irq,
2313                                       "fasteio");
2314         apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector);   /* Fixed mode */
2315         enable_8259A_irq(0);
2316
2317         if (timer_irq_works()) {
2318                 printk(" works.\n");
2319                 return;
2320         }
2321         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
2322         printk(" failed.\n");
2323
2324         printk(KERN_INFO "...trying to set up timer as ExtINT IRQ...");
2325
2326         timer_ack = 0;
2327         init_8259A(0);
2328         make_8259A_irq(0);
2329         apic_write_around(APIC_LVT0, APIC_DM_EXTINT);
2330
2331         unlock_ExtINT_logic();
2332
2333         if (timer_irq_works()) {
2334                 printk(" works.\n");
2335                 return;
2336         }
2337         printk(" failed :(.\n");
2338         panic("IO-APIC + timer doesn't work!  Boot with apic=debug and send a "
2339                 "report.  Then try booting with the 'noapic' option");
2340 }
2341
2342 /*
2343  *
2344  * IRQ's that are handled by the PIC in the MPS IOAPIC case.
2345  * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
2346  *   Linux doesn't really care, as it's not actually used
2347  *   for any interrupt handling anyway.
2348  */
2349 #define PIC_IRQS        (1 << PIC_CASCADE_IR)
2350
2351 void __init setup_IO_APIC(void)
2352 {
2353         enable_IO_APIC();
2354
2355         if (acpi_ioapic)
2356                 io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
2357         else
2358                 io_apic_irqs = ~PIC_IRQS;
2359
2360         printk("ENABLING IO-APIC IRQs\n");
2361
2362         /*
2363          * Set up IO-APIC IRQ routing.
2364          */
2365         if (!acpi_ioapic)
2366                 setup_ioapic_ids_from_mpc();
2367         sync_Arb_IDs();
2368         setup_IO_APIC_irqs();
2369         init_IO_APIC_traps();
2370         check_timer();
2371         if (!acpi_ioapic)
2372                 print_IO_APIC();
2373 }
2374
2375 static int __init setup_disable_8254_timer(char *s)
2376 {
2377         timer_over_8254 = -1;
2378         return 1;
2379 }
2380 static int __init setup_enable_8254_timer(char *s)
2381 {
2382         timer_over_8254 = 2;
2383         return 1;
2384 }
2385
2386 __setup("disable_8254_timer", setup_disable_8254_timer);
2387 __setup("enable_8254_timer", setup_enable_8254_timer);
2388
2389 /*
2390  *      Called after all the initialization is done. If we didnt find any
2391  *      APIC bugs then we can allow the modify fast path
2392  */
2393
2394 static int __init io_apic_bug_finalize(void)
2395 {
2396         if(sis_apic_bug == -1)
2397                 sis_apic_bug = 0;
2398         return 0;
2399 }
2400
2401 late_initcall(io_apic_bug_finalize);
2402
2403 struct sysfs_ioapic_data {
2404         struct sys_device dev;
2405         struct IO_APIC_route_entry entry[0];
2406 };
2407 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
2408
2409 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
2410 {
2411         struct IO_APIC_route_entry *entry;
2412         struct sysfs_ioapic_data *data;
2413         int i;
2414
2415         data = container_of(dev, struct sysfs_ioapic_data, dev);
2416         entry = data->entry;
2417         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++)
2418                 entry[i] = ioapic_read_entry(dev->id, i);
2419
2420         return 0;
2421 }
2422
2423 static int ioapic_resume(struct sys_device *dev)
2424 {
2425         struct IO_APIC_route_entry *entry;
2426         struct sysfs_ioapic_data *data;
2427         unsigned long flags;
2428         union IO_APIC_reg_00 reg_00;
2429         int i;
2430
2431         data = container_of(dev, struct sysfs_ioapic_data, dev);
2432         entry = data->entry;
2433
2434         spin_lock_irqsave(&ioapic_lock, flags);
2435         reg_00.raw = io_apic_read(dev->id, 0);
2436         if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
2437                 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
2438                 io_apic_write(dev->id, 0, reg_00.raw);
2439         }
2440         spin_unlock_irqrestore(&ioapic_lock, flags);
2441         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++)
2442                 ioapic_write_entry(dev->id, i, entry[i]);
2443
2444         return 0;
2445 }
2446
2447 static struct sysdev_class ioapic_sysdev_class = {
2448         set_kset_name("ioapic"),
2449         .suspend = ioapic_suspend,
2450         .resume = ioapic_resume,
2451 };
2452
2453 static int __init ioapic_init_sysfs(void)
2454 {
2455         struct sys_device * dev;
2456         int i, size, error = 0;
2457
2458         error = sysdev_class_register(&ioapic_sysdev_class);
2459         if (error)
2460                 return error;
2461
2462         for (i = 0; i < nr_ioapics; i++ ) {
2463                 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
2464                         * sizeof(struct IO_APIC_route_entry);
2465                 mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
2466                 if (!mp_ioapic_data[i]) {
2467                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2468                         continue;
2469                 }
2470                 memset(mp_ioapic_data[i], 0, size);
2471                 dev = &mp_ioapic_data[i]->dev;
2472                 dev->id = i;
2473                 dev->cls = &ioapic_sysdev_class;
2474                 error = sysdev_register(dev);
2475                 if (error) {
2476                         kfree(mp_ioapic_data[i]);
2477                         mp_ioapic_data[i] = NULL;
2478                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2479                         continue;
2480                 }
2481         }
2482
2483         return 0;
2484 }
2485
2486 device_initcall(ioapic_init_sysfs);
2487
2488 /*
2489  * Dynamic irq allocate and deallocation
2490  */
2491 int create_irq(void)
2492 {
2493         /* Allocate an unused irq */
2494         int irq, new, vector = 0;
2495         unsigned long flags;
2496
2497         irq = -ENOSPC;
2498         spin_lock_irqsave(&vector_lock, flags);
2499         for (new = (NR_IRQS - 1); new >= 0; new--) {
2500                 if (platform_legacy_irq(new))
2501                         continue;
2502                 if (irq_vector[new] != 0)
2503                         continue;
2504                 vector = __assign_irq_vector(new);
2505                 if (likely(vector > 0))
2506                         irq = new;
2507                 break;
2508         }
2509         spin_unlock_irqrestore(&vector_lock, flags);
2510
2511         if (irq >= 0) {
2512                 set_intr_gate(vector, interrupt[irq]);
2513                 dynamic_irq_init(irq);
2514         }
2515         return irq;
2516 }
2517
2518 void destroy_irq(unsigned int irq)
2519 {
2520         unsigned long flags;
2521
2522         dynamic_irq_cleanup(irq);
2523
2524         spin_lock_irqsave(&vector_lock, flags);
2525         irq_vector[irq] = 0;
2526         spin_unlock_irqrestore(&vector_lock, flags);
2527 }
2528
2529 /*
2530  * MSI mesage composition
2531  */
2532 #ifdef CONFIG_PCI_MSI
2533 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
2534 {
2535         int vector;
2536         unsigned dest;
2537
2538         vector = assign_irq_vector(irq);
2539         if (vector >= 0) {
2540                 dest = cpu_mask_to_apicid(TARGET_CPUS);
2541
2542                 msg->address_hi = MSI_ADDR_BASE_HI;
2543                 msg->address_lo =
2544                         MSI_ADDR_BASE_LO |
2545                         ((INT_DEST_MODE == 0) ?
2546                                 MSI_ADDR_DEST_MODE_PHYSICAL:
2547                                 MSI_ADDR_DEST_MODE_LOGICAL) |
2548                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2549                                 MSI_ADDR_REDIRECTION_CPU:
2550                                 MSI_ADDR_REDIRECTION_LOWPRI) |
2551                         MSI_ADDR_DEST_ID(dest);
2552
2553                 msg->data =
2554                         MSI_DATA_TRIGGER_EDGE |
2555                         MSI_DATA_LEVEL_ASSERT |
2556                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2557                                 MSI_DATA_DELIVERY_FIXED:
2558                                 MSI_DATA_DELIVERY_LOWPRI) |
2559                         MSI_DATA_VECTOR(vector);
2560         }
2561         return vector;
2562 }
2563
2564 #ifdef CONFIG_SMP
2565 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
2566 {
2567         struct msi_msg msg;
2568         unsigned int dest;
2569         cpumask_t tmp;
2570         int vector;
2571
2572         cpus_and(tmp, mask, cpu_online_map);
2573         if (cpus_empty(tmp))
2574                 tmp = TARGET_CPUS;
2575
2576         vector = assign_irq_vector(irq);
2577         if (vector < 0)
2578                 return;
2579
2580         dest = cpu_mask_to_apicid(mask);
2581
2582         read_msi_msg(irq, &msg);
2583
2584         msg.data &= ~MSI_DATA_VECTOR_MASK;
2585         msg.data |= MSI_DATA_VECTOR(vector);
2586         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
2587         msg.address_lo |= MSI_ADDR_DEST_ID(dest);
2588
2589         write_msi_msg(irq, &msg);
2590         set_native_irq_info(irq, mask);
2591 }
2592 #endif /* CONFIG_SMP */
2593
2594 /*
2595  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
2596  * which implement the MSI or MSI-X Capability Structure.
2597  */
2598 static struct irq_chip msi_chip = {
2599         .name           = "PCI-MSI",
2600         .unmask         = unmask_msi_irq,
2601         .mask           = mask_msi_irq,
2602         .ack            = ack_ioapic_irq,
2603 #ifdef CONFIG_SMP
2604         .set_affinity   = set_msi_irq_affinity,
2605 #endif
2606         .retrigger      = ioapic_retrigger_irq,
2607 };
2608
2609 int arch_setup_msi_irq(unsigned int irq, struct pci_dev *dev)
2610 {
2611         struct msi_msg msg;
2612         int ret;
2613         ret = msi_compose_msg(dev, irq, &msg);
2614         if (ret < 0)
2615                 return ret;
2616
2617         write_msi_msg(irq, &msg);
2618
2619         set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq,
2620                                       "edge");
2621
2622         return 0;
2623 }
2624
2625 void arch_teardown_msi_irq(unsigned int irq)
2626 {
2627         return;
2628 }
2629
2630 #endif /* CONFIG_PCI_MSI */
2631
2632 /*
2633  * Hypertransport interrupt support
2634  */
2635 #ifdef CONFIG_HT_IRQ
2636
2637 #ifdef CONFIG_SMP
2638
2639 static void target_ht_irq(unsigned int irq, unsigned int dest)
2640 {
2641         struct ht_irq_msg msg;
2642         fetch_ht_irq_msg(irq, &msg);
2643
2644         msg.address_lo &= ~(HT_IRQ_LOW_DEST_ID_MASK);
2645         msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
2646
2647         msg.address_lo |= HT_IRQ_LOW_DEST_ID(dest);
2648         msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
2649
2650         write_ht_irq_msg(irq, &msg);
2651 }
2652
2653 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2654 {
2655         unsigned int dest;
2656         cpumask_t tmp;
2657
2658         cpus_and(tmp, mask, cpu_online_map);
2659         if (cpus_empty(tmp))
2660                 tmp = TARGET_CPUS;
2661
2662         cpus_and(mask, tmp, CPU_MASK_ALL);
2663
2664         dest = cpu_mask_to_apicid(mask);
2665
2666         target_ht_irq(irq, dest);
2667         set_native_irq_info(irq, mask);
2668 }
2669 #endif
2670
2671 static struct irq_chip ht_irq_chip = {
2672         .name           = "PCI-HT",
2673         .mask           = mask_ht_irq,
2674         .unmask         = unmask_ht_irq,
2675         .ack            = ack_ioapic_irq,
2676 #ifdef CONFIG_SMP
2677         .set_affinity   = set_ht_irq_affinity,
2678 #endif
2679         .retrigger      = ioapic_retrigger_irq,
2680 };
2681
2682 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2683 {
2684         int vector;
2685
2686         vector = assign_irq_vector(irq);
2687         if (vector >= 0) {
2688                 struct ht_irq_msg msg;
2689                 unsigned dest;
2690                 cpumask_t tmp;
2691
2692                 cpus_clear(tmp);
2693                 cpu_set(vector >> 8, tmp);
2694                 dest = cpu_mask_to_apicid(tmp);
2695
2696                 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
2697
2698                 msg.address_lo =
2699                         HT_IRQ_LOW_BASE |
2700                         HT_IRQ_LOW_DEST_ID(dest) |
2701                         HT_IRQ_LOW_VECTOR(vector) |
2702                         ((INT_DEST_MODE == 0) ?
2703                                 HT_IRQ_LOW_DM_PHYSICAL :
2704                                 HT_IRQ_LOW_DM_LOGICAL) |
2705                         HT_IRQ_LOW_RQEOI_EDGE |
2706                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2707                                 HT_IRQ_LOW_MT_FIXED :
2708                                 HT_IRQ_LOW_MT_ARBITRATED) |
2709                         HT_IRQ_LOW_IRQ_MASKED;
2710
2711                 write_ht_irq_msg(irq, &msg);
2712
2713                 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2714                                               handle_edge_irq, "edge");
2715         }
2716         return vector;
2717 }
2718 #endif /* CONFIG_HT_IRQ */
2719
2720 /* --------------------------------------------------------------------------
2721                           ACPI-based IOAPIC Configuration
2722    -------------------------------------------------------------------------- */
2723
2724 #ifdef CONFIG_ACPI
2725
2726 int __init io_apic_get_unique_id (int ioapic, int apic_id)
2727 {
2728         union IO_APIC_reg_00 reg_00;
2729         static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
2730         physid_mask_t tmp;
2731         unsigned long flags;
2732         int i = 0;
2733
2734         /*
2735          * The P4 platform supports up to 256 APIC IDs on two separate APIC
2736          * buses (one for LAPICs, one for IOAPICs), where predecessors only
2737          * supports up to 16 on one shared APIC bus.
2738          *
2739          * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
2740          *      advantage of new APIC bus architecture.
2741          */
2742
2743         if (physids_empty(apic_id_map))
2744                 apic_id_map = ioapic_phys_id_map(phys_cpu_present_map);
2745
2746         spin_lock_irqsave(&ioapic_lock, flags);
2747         reg_00.raw = io_apic_read(ioapic, 0);
2748         spin_unlock_irqrestore(&ioapic_lock, flags);
2749
2750         if (apic_id >= get_physical_broadcast()) {
2751                 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
2752                         "%d\n", ioapic, apic_id, reg_00.bits.ID);
2753                 apic_id = reg_00.bits.ID;
2754         }
2755
2756         /*
2757          * Every APIC in a system must have a unique ID or we get lots of nice
2758          * 'stuck on smp_invalidate_needed IPI wait' messages.
2759          */
2760         if (check_apicid_used(apic_id_map, apic_id)) {
2761
2762                 for (i = 0; i < get_physical_broadcast(); i++) {
2763                         if (!check_apicid_used(apic_id_map, i))
2764                                 break;
2765                 }
2766
2767                 if (i == get_physical_broadcast())
2768                         panic("Max apic_id exceeded!\n");
2769
2770                 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
2771                         "trying %d\n", ioapic, apic_id, i);
2772
2773                 apic_id = i;
2774         }
2775
2776         tmp = apicid_to_cpu_present(apic_id);
2777         physids_or(apic_id_map, apic_id_map, tmp);
2778
2779         if (reg_00.bits.ID != apic_id) {
2780                 reg_00.bits.ID = apic_id;
2781
2782                 spin_lock_irqsave(&ioapic_lock, flags);
2783                 io_apic_write(ioapic, 0, reg_00.raw);
2784                 reg_00.raw = io_apic_read(ioapic, 0);
2785                 spin_unlock_irqrestore(&ioapic_lock, flags);
2786
2787                 /* Sanity check */
2788                 if (reg_00.bits.ID != apic_id) {
2789                         printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
2790                         return -1;
2791                 }
2792         }
2793
2794         apic_printk(APIC_VERBOSE, KERN_INFO
2795                         "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
2796
2797         return apic_id;
2798 }
2799
2800
2801 int __init io_apic_get_version (int ioapic)
2802 {
2803         union IO_APIC_reg_01    reg_01;
2804         unsigned long flags;
2805
2806         spin_lock_irqsave(&ioapic_lock, flags);
2807         reg_01.raw = io_apic_read(ioapic, 1);
2808         spin_unlock_irqrestore(&ioapic_lock, flags);
2809
2810         return reg_01.bits.version;
2811 }
2812
2813
2814 int __init io_apic_get_redir_entries (int ioapic)
2815 {
2816         union IO_APIC_reg_01    reg_01;
2817         unsigned long flags;
2818
2819         spin_lock_irqsave(&ioapic_lock, flags);
2820         reg_01.raw = io_apic_read(ioapic, 1);
2821         spin_unlock_irqrestore(&ioapic_lock, flags);
2822
2823         return reg_01.bits.entries;
2824 }
2825
2826
2827 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low)
2828 {
2829         struct IO_APIC_route_entry entry;
2830         unsigned long flags;
2831
2832         if (!IO_APIC_IRQ(irq)) {
2833                 printk(KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2834                         ioapic);
2835                 return -EINVAL;
2836         }
2837
2838         /*
2839          * Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
2840          * Note that we mask (disable) IRQs now -- these get enabled when the
2841          * corresponding device driver registers for this IRQ.
2842          */
2843
2844         memset(&entry,0,sizeof(entry));
2845
2846         entry.delivery_mode = INT_DELIVERY_MODE;
2847         entry.dest_mode = INT_DEST_MODE;
2848         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
2849         entry.trigger = edge_level;
2850         entry.polarity = active_high_low;
2851         entry.mask  = 1;
2852
2853         /*
2854          * IRQs < 16 are already in the irq_2_pin[] map
2855          */
2856         if (irq >= 16)
2857                 add_pin_to_irq(irq, ioapic, pin);
2858
2859         entry.vector = assign_irq_vector(irq);
2860
2861         apic_printk(APIC_DEBUG, KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry "
2862                 "(%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i)\n", ioapic,
2863                 mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq,
2864                 edge_level, active_high_low);
2865
2866         ioapic_register_intr(irq, entry.vector, edge_level);
2867
2868         if (!ioapic && (irq < 16))
2869                 disable_8259A_irq(irq);
2870
2871         spin_lock_irqsave(&ioapic_lock, flags);
2872         __ioapic_write_entry(ioapic, pin, entry);
2873         set_native_irq_info(irq, TARGET_CPUS);
2874         spin_unlock_irqrestore(&ioapic_lock, flags);
2875
2876         return 0;
2877 }
2878
2879 #endif /* CONFIG_ACPI */
2880
2881 static int __init parse_disable_timer_pin_1(char *arg)
2882 {
2883         disable_timer_pin_1 = 1;
2884         return 0;
2885 }
2886 early_param("disable_timer_pin_1", parse_disable_timer_pin_1);
2887
2888 static int __init parse_enable_timer_pin_1(char *arg)
2889 {
2890         disable_timer_pin_1 = -1;
2891         return 0;
2892 }
2893 early_param("enable_timer_pin_1", parse_enable_timer_pin_1);
2894
2895 static int __init parse_noapic(char *arg)
2896 {
2897         /* disable IO-APIC */
2898         disable_ioapic_setup();
2899         return 0;
2900 }
2901 early_param("noapic", parse_noapic);