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
  38 #include <asm/io.h>
  39 #include <asm/smp.h>
  40 #include <asm/desc.h>
  41 #include <asm/timer.h>
  42 #include <asm/i8259.h>
  43 #include <asm/nmi.h>
  44 #include <asm/msidef.h>
  45 #include <asm/hypertransport.h>
  46
  47 #include <mach_apic.h>
  48 #include <mach_apicdef.h>
  49
  50 #include "io_ports.h"
  51
  52 int (*ioapic_renumber_irq)(int ioapic, int irq);
  53 atomic_t irq_mis_count;
  54
  55 /* Where if anywhere is the i8259 connect in external int mode */
  56 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
  57
  58 static DEFINE_SPINLOCK(ioapic_lock);
  59 static DEFINE_SPINLOCK(vector_lock);
  60
  61 int timer_over_8254 __initdata = 1;
  62
  63 /*
  64  *      Is the SiS APIC rmw bug present ?
  65  *      -1 = don't know, 0 = no, 1 = yes
  66  */
  67 int sis_apic_bug = -1;
  68
  69 /*
  70  * # of IRQ routing registers
  71  */
  72 int nr_ioapic_registers[MAX_IO_APICS];
  73
  74 static int disable_timer_pin_1 __initdata;
  75
  76 /*
  77  * Rough estimation of how many shared IRQs there are, can
  78  * be changed anytime.
  79  */
  80 #define MAX_PLUS_SHARED_IRQS NR_IRQS
  81 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
  82
  83 /*
  84  * This is performance-critical, we want to do it O(1)
  85  *
  86  * the indexing order of this array favors 1:1 mappings
  87  * between pins and IRQs.
  88  */
  89
  90 static struct irq_pin_list {
  91         int apic, pin, next;
  92 } irq_2_pin[PIN_MAP_SIZE];
  93
  94 struct io_apic {
  95         unsigned int index;
  96         unsigned int unused[3];
  97         unsigned int data;
  98 };
  99
 100 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
 101 {
 102         return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
 103                 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
 104 }
 105
 106 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
 107 {
 108         struct io_apic __iomem *io_apic = io_apic_base(apic);
 109         writel(reg, &io_apic->index);
 110         return readl(&io_apic->data);
 111 }
 112
 113 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
 114 {
 115         struct io_apic __iomem *io_apic = io_apic_base(apic);
 116         writel(reg, &io_apic->index);
 117         writel(value, &io_apic->data);
 118 }
 119
 120 /*
 121  * Re-write a value: to be used for read-modify-write
 122  * cycles where the read already set up the index register.
 123  *
 124  * Older SiS APIC requires we rewrite the index register
 125  */
 126 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
 127 {
 128         volatile struct io_apic *io_apic = io_apic_base(apic);
 129         if (sis_apic_bug)
 130                 writel(reg, &io_apic->index);
 131         writel(value, &io_apic->data);
 132 }
 133
 134 union entry_union {
 135         struct { u32 w1, w2; };
 136         struct IO_APIC_route_entry entry;
 137 };
 138
 139 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
 140 {
 141         union entry_union eu;
 142         unsigned long flags;
 143         spin_lock_irqsave(&ioapic_lock, flags);
 144         eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
 145         eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
 146         spin_unlock_irqrestore(&ioapic_lock, flags);
 147         return eu.entry;
 148 }
 149
 150 /*
 151  * When we write a new IO APIC routing entry, we need to write the high
 152  * word first! If the mask bit in the low word is clear, we will enable
 153  * the interrupt, and we need to make sure the entry is fully populated
 154  * before that happens.
 155  */
 156 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
 157 {
 158         unsigned long flags;
 159         union entry_union eu;
 160         eu.entry = e;
 161         spin_lock_irqsave(&ioapic_lock, flags);
 162         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
 163         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
 164         spin_unlock_irqrestore(&ioapic_lock, flags);
 165 }
 166
 167 /*
 168  * When we mask an IO APIC routing entry, we need to write the low
 169  * word first, in order to set the mask bit before we change the
 170  * high bits!
 171  */
 172 static void ioapic_mask_entry(int apic, int pin)
 173 {
 174         unsigned long flags;
 175         union entry_union eu = { .entry.mask = 1 };
 176
 177         spin_lock_irqsave(&ioapic_lock, flags);
 178         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
 179         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
 180         spin_unlock_irqrestore(&ioapic_lock, flags);
 181 }
 182
 183 /*
 184  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
 185  * shared ISA-space IRQs, so we have to support them. We are super
 186  * fast in the common case, and fast for shared ISA-space IRQs.
 187  */
 188 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
 189 {
 190         static int first_free_entry = NR_IRQS;
 191         struct irq_pin_list *entry = irq_2_pin + irq;
 192
 193         while (entry->next)
 194                 entry = irq_2_pin + entry->next;
 195
 196         if (entry->pin != -1) {
 197                 entry->next = first_free_entry;
 198                 entry = irq_2_pin + entry->next;
 199                 if (++first_free_entry >= PIN_MAP_SIZE)
 200                         panic("io_apic.c: whoops");
 201         }
 202         entry->apic = apic;
 203         entry->pin = pin;
 204 }
 205
 206 /*
 207  * Reroute an IRQ to a different pin.
 208  */
 209 static void __init replace_pin_at_irq(unsigned int irq,
 210                                       int oldapic, int oldpin,
 211                                       int newapic, int newpin)
 212 {
 213         struct irq_pin_list *entry = irq_2_pin + irq;
 214
 215         while (1) {
 216                 if (entry->apic == oldapic && entry->pin == oldpin) {
 217                         entry->apic = newapic;
 218                         entry->pin = newpin;
 219                 }
 220                 if (!entry->next)
 221                         break;
 222                 entry = irq_2_pin + entry->next;
 223         }
 224 }
 225
 226 static void __modify_IO_APIC_irq (unsigned int irq, unsigned long enable, unsigned long disable)
 227 {
 228         struct irq_pin_list *entry = irq_2_pin + irq;
 229         unsigned int pin, reg;
 230
 231         for (;;) {
 232                 pin = entry->pin;
 233                 if (pin == -1)
 234                         break;
 235                 reg = io_apic_read(entry->apic, 0x10 + pin*2);
 236                 reg &= ~disable;
 237                 reg |= enable;
 238                 io_apic_modify(entry->apic, 0x10 + pin*2, reg);
 239                 if (!entry->next)
 240                         break;
 241                 entry = irq_2_pin + entry->next;
 242         }
 243 }
 244
 245 /* mask = 1 */
 246 static void __mask_IO_APIC_irq (unsigned int irq)
 247 {
 248         __modify_IO_APIC_irq(irq, 0x00010000, 0);
 249 }
 250
 251 /* mask = 0 */
 252 static void __unmask_IO_APIC_irq (unsigned int irq)
 253 {
 254         __modify_IO_APIC_irq(irq, 0, 0x00010000);
 255 }
 256
 257 /* mask = 1, trigger = 0 */
 258 static void __mask_and_edge_IO_APIC_irq (unsigned int irq)
 259 {
 260         __modify_IO_APIC_irq(irq, 0x00010000, 0x00008000);
 261 }
 262
 263 /* mask = 0, trigger = 1 */
 264 static void __unmask_and_level_IO_APIC_irq (unsigned int irq)
 265 {
 266         __modify_IO_APIC_irq(irq, 0x00008000, 0x00010000);
 267 }
 268
 269 static void mask_IO_APIC_irq (unsigned int irq)
 270 {
 271         unsigned long flags;
 272
 273         spin_lock_irqsave(&ioapic_lock, flags);
 274         __mask_IO_APIC_irq(irq);
 275         spin_unlock_irqrestore(&ioapic_lock, flags);
 276 }
 277
 278 static void unmask_IO_APIC_irq (unsigned int irq)
 279 {
 280         unsigned long flags;
 281
 282         spin_lock_irqsave(&ioapic_lock, flags);
 283         __unmask_IO_APIC_irq(irq);
 284         spin_unlock_irqrestore(&ioapic_lock, flags);
 285 }
 286
 287 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
 288 {
 289         struct IO_APIC_route_entry entry;
 290
 291         /* Check delivery_mode to be sure we're not clearing an SMI pin */
 292         entry = ioapic_read_entry(apic, pin);
 293         if (entry.delivery_mode == dest_SMI)
 294                 return;
 295
 296         /*
 297          * Disable it in the IO-APIC irq-routing table:
 298          */
 299         ioapic_mask_entry(apic, pin);
 300 }
 301
 302 static void clear_IO_APIC (void)
 303 {
 304         int apic, pin;
 305
 306         for (apic = 0; apic < nr_ioapics; apic++)
 307                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
 308                         clear_IO_APIC_pin(apic, pin);
 309 }
 310
 311 #ifdef CONFIG_SMP
 312 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
 313 {
 314         unsigned long flags;
 315         int pin;
 316         struct irq_pin_list *entry = irq_2_pin + irq;
 317         unsigned int apicid_value;
 318         cpumask_t tmp;
 319
 320         cpus_and(tmp, cpumask, cpu_online_map);
 321         if (cpus_empty(tmp))
 322                 tmp = TARGET_CPUS;
 323
 324         cpus_and(cpumask, tmp, CPU_MASK_ALL);
 325
 326         apicid_value = cpu_mask_to_apicid(cpumask);
 327         /* Prepare to do the io_apic_write */
 328         apicid_value = apicid_value << 24;
 329         spin_lock_irqsave(&ioapic_lock, flags);
 330         for (;;) {
 331                 pin = entry->pin;
 332                 if (pin == -1)
 333                         break;
 334                 io_apic_write(entry->apic, 0x10 + 1 + pin*2, apicid_value);
 335                 if (!entry->next)
 336                         break;
 337                 entry = irq_2_pin + entry->next;
 338         }
 339         set_native_irq_info(irq, cpumask);
 340         spin_unlock_irqrestore(&ioapic_lock, flags);
 341 }
 342
 343 #if defined(CONFIG_IRQBALANCE)
 344 # include <asm/processor.h>     /* kernel_thread() */
 345 # include <linux/kernel_stat.h> /* kstat */
 346 # include <linux/slab.h>                /* kmalloc() */
 347 # include <linux/timer.h>       /* time_after() */
 348
 349 #ifdef CONFIG_BALANCED_IRQ_DEBUG
 350 #  define TDprintk(x...) do { printk("<%ld:%s:%d>: ", jiffies, __FILE__, __LINE__); printk(x); } while (0)
 351 #  define Dprintk(x...) do { TDprintk(x); } while (0)
 352 # else
 353 #  define TDprintk(x...)
 354 #  define Dprintk(x...)
 355 # endif
 356
 357 #define IRQBALANCE_CHECK_ARCH -999
 358 #define MAX_BALANCED_IRQ_INTERVAL       (5*HZ)
 359 #define MIN_BALANCED_IRQ_INTERVAL       (HZ/2)
 360 #define BALANCED_IRQ_MORE_DELTA         (HZ/10)
 361 #define BALANCED_IRQ_LESS_DELTA         (HZ)
 362
 363 static int irqbalance_disabled __read_mostly = IRQBALANCE_CHECK_ARCH;
 364 static int physical_balance __read_mostly;
 365 static long balanced_irq_interval __read_mostly = MAX_BALANCED_IRQ_INTERVAL;
 366
 367 static struct irq_cpu_info {
 368         unsigned long * last_irq;
 369         unsigned long * irq_delta;
 370         unsigned long irq;
 371 } irq_cpu_data[NR_CPUS];
 372
 373 #define CPU_IRQ(cpu)            (irq_cpu_data[cpu].irq)
 374 #define LAST_CPU_IRQ(cpu,irq)   (irq_cpu_data[cpu].last_irq[irq])
 375 #define IRQ_DELTA(cpu,irq)      (irq_cpu_data[cpu].irq_delta[irq])
 376
 377 #define IDLE_ENOUGH(cpu,now) \
 378         (idle_cpu(cpu) && ((now) - per_cpu(irq_stat, (cpu)).idle_timestamp > 1))
 379
 380 #define IRQ_ALLOWED(cpu, allowed_mask)  cpu_isset(cpu, allowed_mask)
 381
 382 #define CPU_TO_PACKAGEINDEX(i) (first_cpu(cpu_sibling_map[i]))
 383
 384 static cpumask_t balance_irq_affinity[NR_IRQS] = {
 385         [0 ... NR_IRQS-1] = CPU_MASK_ALL
 386 };
 387
 388 void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 389 {
 390         balance_irq_affinity[irq] = mask;
 391 }
 392
 393 static unsigned long move(int curr_cpu, cpumask_t allowed_mask,
 394                         unsigned long now, int direction)
 395 {
 396         int search_idle = 1;
 397         int cpu = curr_cpu;
 398
 399         goto inside;
 400
 401         do {
 402                 if (unlikely(cpu == curr_cpu))
 403                         search_idle = 0;
 404 inside:
 405                 if (direction == 1) {
 406                         cpu++;
 407                         if (cpu >= NR_CPUS)
 408                                 cpu = 0;
 409                 } else {
 410                         cpu--;
 411                         if (cpu == -1)
 412                                 cpu = NR_CPUS-1;
 413                 }
 414         } while (!cpu_online(cpu) || !IRQ_ALLOWED(cpu,allowed_mask) ||
 415                         (search_idle && !IDLE_ENOUGH(cpu,now)));
 416
 417         return cpu;
 418 }
 419
 420 static inline void balance_irq(int cpu, int irq)
 421 {
 422         unsigned long now = jiffies;
 423         cpumask_t allowed_mask;
 424         unsigned int new_cpu;
 425
 426         if (irqbalance_disabled)
 427                 return;
 428
 429         cpus_and(allowed_mask, cpu_online_map, balance_irq_affinity[irq]);
 430         new_cpu = move(cpu, allowed_mask, now, 1);
 431         if (cpu != new_cpu) {
 432                 set_pending_irq(irq, cpumask_of_cpu(new_cpu));
 433         }
 434 }
 435
 436 static inline void rotate_irqs_among_cpus(unsigned long useful_load_threshold)
 437 {
 438         int i, j;
 439         Dprintk("Rotating IRQs among CPUs.\n");
 440         for_each_online_cpu(i) {
 441                 for (j = 0; j < NR_IRQS; j++) {
 442                         if (!irq_desc[j].action)
 443                                 continue;
 444                         /* Is it a significant load ?  */
 445                         if (IRQ_DELTA(CPU_TO_PACKAGEINDEX(i),j) <
 446                                                 useful_load_threshold)
 447                                 continue;
 448                         balance_irq(i, j);
 449                 }
 450         }
 451         balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
 452                 balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
 453         return;
 454 }
 455
 456 static void do_irq_balance(void)
 457 {
 458         int i, j;
 459         unsigned long max_cpu_irq = 0, min_cpu_irq = (~0);
 460         unsigned long move_this_load = 0;
 461         int max_loaded = 0, min_loaded = 0;
 462         int load;
 463         unsigned long useful_load_threshold = balanced_irq_interval + 10;
 464         int selected_irq;
 465         int tmp_loaded, first_attempt = 1;
 466         unsigned long tmp_cpu_irq;
 467         unsigned long imbalance = 0;
 468         cpumask_t allowed_mask, target_cpu_mask, tmp;
 469
 470         for_each_possible_cpu(i) {
 471                 int package_index;
 472                 CPU_IRQ(i) = 0;
 473                 if (!cpu_online(i))
 474                         continue;
 475                 package_index = CPU_TO_PACKAGEINDEX(i);
 476                 for (j = 0; j < NR_IRQS; j++) {
 477                         unsigned long value_now, delta;
 478                         /* Is this an active IRQ? */
 479                         if (!irq_desc[j].action)
 480                                 continue;
 481                         if ( package_index == i )
 482                                 IRQ_DELTA(package_index,j) = 0;
 483                         /* Determine the total count per processor per IRQ */
 484                         value_now = (unsigned long) kstat_cpu(i).irqs[j];
 485
 486                         /* Determine the activity per processor per IRQ */
 487                         delta = value_now - LAST_CPU_IRQ(i,j);
 488
 489                         /* Update last_cpu_irq[][] for the next time */
 490                         LAST_CPU_IRQ(i,j) = value_now;
 491
 492                         /* Ignore IRQs whose rate is less than the clock */
 493                         if (delta < useful_load_threshold)
 494                                 continue;
 495                         /* update the load for the processor or package total */
 496                         IRQ_DELTA(package_index,j) += delta;
 497
 498                         /* Keep track of the higher numbered sibling as well */
 499                         if (i != package_index)
 500                                 CPU_IRQ(i) += delta;
 501                         /*
 502                          * We have sibling A and sibling B in the package
 503                          *
 504                          * cpu_irq[A] = load for cpu A + load for cpu B
 505                          * cpu_irq[B] = load for cpu B
 506                          */
 507                         CPU_IRQ(package_index) += delta;
 508                 }
 509         }
 510         /* Find the least loaded processor package */
 511         for_each_online_cpu(i) {
 512                 if (i != CPU_TO_PACKAGEINDEX(i))
 513                         continue;
 514                 if (min_cpu_irq > CPU_IRQ(i)) {
 515                         min_cpu_irq = CPU_IRQ(i);
 516                         min_loaded = i;
 517                 }
 518         }
 519         max_cpu_irq = ULONG_MAX;
 520
 521 tryanothercpu:
 522         /* Look for heaviest loaded processor.
 523          * We may come back to get the next heaviest loaded processor.
 524          * Skip processors with trivial loads.
 525          */
 526         tmp_cpu_irq = 0;
 527         tmp_loaded = -1;
 528         for_each_online_cpu(i) {
 529                 if (i != CPU_TO_PACKAGEINDEX(i))
 530                         continue;
 531                 if (max_cpu_irq <= CPU_IRQ(i))
 532                         continue;
 533                 if (tmp_cpu_irq < CPU_IRQ(i)) {
 534                         tmp_cpu_irq = CPU_IRQ(i);
 535                         tmp_loaded = i;
 536                 }
 537         }
 538
 539         if (tmp_loaded == -1) {
 540          /* In the case of small number of heavy interrupt sources,
 541           * loading some of the cpus too much. We use Ingo's original
 542           * approach to rotate them around.
 543           */
 544                 if (!first_attempt && imbalance >= useful_load_threshold) {
 545                         rotate_irqs_among_cpus(useful_load_threshold);
 546                         return;
 547                 }
 548                 goto not_worth_the_effort;
 549         }
 550
 551         first_attempt = 0;              /* heaviest search */
 552         max_cpu_irq = tmp_cpu_irq;      /* load */
 553         max_loaded = tmp_loaded;        /* processor */
 554         imbalance = (max_cpu_irq - min_cpu_irq) / 2;
 555
 556         Dprintk("max_loaded cpu = %d\n", max_loaded);
 557         Dprintk("min_loaded cpu = %d\n", min_loaded);
 558         Dprintk("max_cpu_irq load = %ld\n", max_cpu_irq);
 559         Dprintk("min_cpu_irq load = %ld\n", min_cpu_irq);
 560         Dprintk("load imbalance = %lu\n", imbalance);
 561
 562         /* if imbalance is less than approx 10% of max load, then
 563          * observe diminishing returns action. - quit
 564          */
 565         if (imbalance < (max_cpu_irq >> 3)) {
 566                 Dprintk("Imbalance too trivial\n");
 567                 goto not_worth_the_effort;
 568         }
 569
 570 tryanotherirq:
 571         /* if we select an IRQ to move that can't go where we want, then
 572          * see if there is another one to try.
 573          */
 574         move_this_load = 0;
 575         selected_irq = -1;
 576         for (j = 0; j < NR_IRQS; j++) {
 577                 /* Is this an active IRQ? */
 578                 if (!irq_desc[j].action)
 579                         continue;
 580                 if (imbalance <= IRQ_DELTA(max_loaded,j))
 581                         continue;
 582                 /* Try to find the IRQ that is closest to the imbalance
 583                  * without going over.
 584                  */
 585                 if (move_this_load < IRQ_DELTA(max_loaded,j)) {
 586                         move_this_load = IRQ_DELTA(max_loaded,j);
 587                         selected_irq = j;
 588                 }
 589         }
 590         if (selected_irq == -1) {
 591                 goto tryanothercpu;
 592         }
 593
 594         imbalance = move_this_load;
 595
 596         /* For physical_balance case, we accumlated both load
 597          * values in the one of the siblings cpu_irq[],
 598          * to use the same code for physical and logical processors
 599          * as much as possible.
 600          *
 601          * NOTE: the cpu_irq[] array holds the sum of the load for
 602          * sibling A and sibling B in the slot for the lowest numbered
 603          * sibling (A), _AND_ the load for sibling B in the slot for
 604          * the higher numbered sibling.
 605          *
 606          * We seek the least loaded sibling by making the comparison
 607          * (A+B)/2 vs B
 608          */
 609         load = CPU_IRQ(min_loaded) >> 1;
 610         for_each_cpu_mask(j, cpu_sibling_map[min_loaded]) {
 611                 if (load > CPU_IRQ(j)) {
 612                         /* This won't change cpu_sibling_map[min_loaded] */
 613                         load = CPU_IRQ(j);
 614                         min_loaded = j;
 615                 }
 616         }
 617
 618         cpus_and(allowed_mask,
 619                 cpu_online_map,
 620                 balance_irq_affinity[selected_irq]);
 621         target_cpu_mask = cpumask_of_cpu(min_loaded);
 622         cpus_and(tmp, target_cpu_mask, allowed_mask);
 623
 624         if (!cpus_empty(tmp)) {
 625
 626                 Dprintk("irq = %d moved to cpu = %d\n",
 627                                 selected_irq, min_loaded);
 628                 /* mark for change destination */
 629                 set_pending_irq(selected_irq, cpumask_of_cpu(min_loaded));
 630
 631                 /* Since we made a change, come back sooner to
 632                  * check for more variation.
 633                  */
 634                 balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
 635                         balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
 636                 return;
 637         }
 638         goto tryanotherirq;
 639
 640 not_worth_the_effort:
 641         /*
 642          * if we did not find an IRQ to move, then adjust the time interval
 643          * upward
 644          */
 645         balanced_irq_interval = min((long)MAX_BALANCED_IRQ_INTERVAL,
 646                 balanced_irq_interval + BALANCED_IRQ_MORE_DELTA);
 647         Dprintk("IRQ worth rotating not found\n");
 648         return;
 649 }
 650
 651 static int balanced_irq(void *unused)
 652 {
 653         int i;
 654         unsigned long prev_balance_time = jiffies;
 655         long time_remaining = balanced_irq_interval;
 656
 657         daemonize("kirqd");
 658
 659         /* push everything to CPU 0 to give us a starting point.  */
 660         for (i = 0 ; i < NR_IRQS ; i++) {
 661                 irq_desc[i].pending_mask = cpumask_of_cpu(0);
 662                 set_pending_irq(i, cpumask_of_cpu(0));
 663         }
 664
 665         for ( ; ; ) {
 666                 time_remaining = schedule_timeout_interruptible(time_remaining);
 667                 try_to_freeze();
 668                 if (time_after(jiffies,
 669                                 prev_balance_time+balanced_irq_interval)) {
 670                         preempt_disable();
 671                         do_irq_balance();
 672                         prev_balance_time = jiffies;
 673                         time_remaining = balanced_irq_interval;
 674                         preempt_enable();
 675                 }
 676         }
 677         return 0;
 678 }
 679
 680 static int __init balanced_irq_init(void)
 681 {
 682         int i;
 683         struct cpuinfo_x86 *c;
 684         cpumask_t tmp;
 685
 686         cpus_shift_right(tmp, cpu_online_map, 2);
 687         c = &boot_cpu_data;
 688         /* When not overwritten by the command line ask subarchitecture. */
 689         if (irqbalance_disabled == IRQBALANCE_CHECK_ARCH)
 690                 irqbalance_disabled = NO_BALANCE_IRQ;
 691         if (irqbalance_disabled)
 692                 return 0;
 693
 694          /* disable irqbalance completely if there is only one processor online */
 695         if (num_online_cpus() < 2) {
 696                 irqbalance_disabled = 1;
 697                 return 0;
 698         }
 699         /*
 700          * Enable physical balance only if more than 1 physical processor
 701          * is present
 702          */
 703         if (smp_num_siblings > 1 && !cpus_empty(tmp))
 704                 physical_balance = 1;
 705
 706         for_each_online_cpu(i) {
 707                 irq_cpu_data[i].irq_delta = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
 708                 irq_cpu_data[i].last_irq = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
 709                 if (irq_cpu_data[i].irq_delta == NULL || irq_cpu_data[i].last_irq == NULL) {
 710                         printk(KERN_ERR "balanced_irq_init: out of memory");
 711                         goto failed;
 712                 }
 713                 memset(irq_cpu_data[i].irq_delta,0,sizeof(unsigned long) * NR_IRQS);
 714                 memset(irq_cpu_data[i].last_irq,0,sizeof(unsigned long) * NR_IRQS);
 715         }
 716
 717         printk(KERN_INFO "Starting balanced_irq\n");
 718         if (kernel_thread(balanced_irq, NULL, CLONE_KERNEL) >= 0)
 719                 return 0;
 720         else
 721                 printk(KERN_ERR "balanced_irq_init: failed to spawn balanced_irq");
 722 failed:
 723         for_each_possible_cpu(i) {
 724                 kfree(irq_cpu_data[i].irq_delta);
 725                 irq_cpu_data[i].irq_delta = NULL;
 726                 kfree(irq_cpu_data[i].last_irq);
 727                 irq_cpu_data[i].last_irq = NULL;
 728         }
 729         return 0;
 730 }
 731
 732 int __init irqbalance_disable(char *str)
 733 {
 734         irqbalance_disabled = 1;
 735         return 1;
 736 }
 737
 738 __setup("noirqbalance", irqbalance_disable);
 739
 740 late_initcall(balanced_irq_init);
 741 #endif /* CONFIG_IRQBALANCE */
 742 #endif /* CONFIG_SMP */
 743
 744 #ifndef CONFIG_SMP
 745 void fastcall send_IPI_self(int vector)
 746 {
 747         unsigned int cfg;
 748
 749         /*
 750          * Wait for idle.
 751          */
 752         apic_wait_icr_idle();
 753         cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL;
 754         /*
 755          * Send the IPI. The write to APIC_ICR fires this off.
 756          */
 757         apic_write_around(APIC_ICR, cfg);
 758 }
 759 #endif /* !CONFIG_SMP */
 760
 761
 762 /*
 763  * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
 764  * specific CPU-side IRQs.
 765  */
 766
 767 #define MAX_PIRQS 8
 768 static int pirq_entries [MAX_PIRQS];
 769 static int pirqs_enabled;
 770 int skip_ioapic_setup;
 771
 772 static int __init ioapic_setup(char *str)
 773 {
 774         skip_ioapic_setup = 1;
 775         return 1;
 776 }
 777
 778 __setup("noapic", ioapic_setup);
 779
 780 static int __init ioapic_pirq_setup(char *str)
 781 {
 782         int i, max;
 783         int ints[MAX_PIRQS+1];
 784
 785         get_options(str, ARRAY_SIZE(ints), ints);
 786
 787         for (i = 0; i < MAX_PIRQS; i++)
 788                 pirq_entries[i] = -1;
 789
 790         pirqs_enabled = 1;
 791         apic_printk(APIC_VERBOSE, KERN_INFO
 792                         "PIRQ redirection, working around broken MP-BIOS.\n");
 793         max = MAX_PIRQS;
 794         if (ints[0] < MAX_PIRQS)
 795                 max = ints[0];
 796
 797         for (i = 0; i < max; i++) {
 798                 apic_printk(APIC_VERBOSE, KERN_DEBUG
 799                                 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
 800                 /*
 801                  * PIRQs are mapped upside down, usually.
 802                  */
 803                 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
 804         }
 805         return 1;
 806 }
 807
 808 __setup("pirq=", ioapic_pirq_setup);
 809
 810 /*
 811  * Find the IRQ entry number of a certain pin.
 812  */
 813 static int find_irq_entry(int apic, int pin, int type)
 814 {
 815         int i;
 816
 817         for (i = 0; i < mp_irq_entries; i++)
 818                 if (mp_irqs[i].mpc_irqtype == type &&
 819                     (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
 820                      mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
 821                     mp_irqs[i].mpc_dstirq == pin)
 822                         return i;
 823
 824         return -1;
 825 }
 826
 827 /*
 828  * Find the pin to which IRQ[irq] (ISA) is connected
 829  */
 830 static int __init find_isa_irq_pin(int irq, int type)
 831 {
 832         int i;
 833
 834         for (i = 0; i < mp_irq_entries; i++) {
 835                 int lbus = mp_irqs[i].mpc_srcbus;
 836
 837                 if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
 838                      mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
 839                      mp_bus_id_to_type[lbus] == MP_BUS_MCA ||
 840                      mp_bus_id_to_type[lbus] == MP_BUS_NEC98
 841                     ) &&
 842                     (mp_irqs[i].mpc_irqtype == type) &&
 843                     (mp_irqs[i].mpc_srcbusirq == irq))
 844
 845                         return mp_irqs[i].mpc_dstirq;
 846         }
 847         return -1;
 848 }
 849
 850 static int __init find_isa_irq_apic(int irq, int type)
 851 {
 852         int i;
 853
 854         for (i = 0; i < mp_irq_entries; i++) {
 855                 int lbus = mp_irqs[i].mpc_srcbus;
 856
 857                 if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
 858                      mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
 859                      mp_bus_id_to_type[lbus] == MP_BUS_MCA ||
 860                      mp_bus_id_to_type[lbus] == MP_BUS_NEC98
 861                     ) &&
 862                     (mp_irqs[i].mpc_irqtype == type) &&
 863                     (mp_irqs[i].mpc_srcbusirq == irq))
 864                         break;
 865         }
 866         if (i < mp_irq_entries) {
 867                 int apic;
 868                 for(apic = 0; apic < nr_ioapics; apic++) {
 869                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
 870                                 return apic;
 871                 }
 872         }
 873
 874         return -1;
 875 }
 876
 877 /*
 878  * Find a specific PCI IRQ entry.
 879  * Not an __init, possibly needed by modules
 880  */
 881 static int pin_2_irq(int idx, int apic, int pin);
 882
 883 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
 884 {
 885         int apic, i, best_guess = -1;
 886
 887         apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, "
 888                 "slot:%d, pin:%d.\n", bus, slot, pin);
 889         if (mp_bus_id_to_pci_bus[bus] == -1) {
 890                 printk(KERN_WARNING "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
 891                 return -1;
 892         }
 893         for (i = 0; i < mp_irq_entries; i++) {
 894                 int lbus = mp_irqs[i].mpc_srcbus;
 895
 896                 for (apic = 0; apic < nr_ioapics; apic++)
 897                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
 898                             mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
 899                                 break;
 900
 901                 if ((mp_bus_id_to_type[lbus] == MP_BUS_PCI) &&
 902                     !mp_irqs[i].mpc_irqtype &&
 903                     (bus == lbus) &&
 904                     (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
 905                         int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
 906
 907                         if (!(apic || IO_APIC_IRQ(irq)))
 908                                 continue;
 909
 910                         if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
 911                                 return irq;
 912                         /*
 913                          * Use the first all-but-pin matching entry as a
 914                          * best-guess fuzzy result for broken mptables.
 915                          */
 916                         if (best_guess < 0)
 917                                 best_guess = irq;
 918                 }
 919         }
 920         return best_guess;
 921 }
 922 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
 923
 924 /*
 925  * This function currently is only a helper for the i386 smp boot process where
 926  * we need to reprogram the ioredtbls to cater for the cpus which have come online
 927  * so mask in all cases should simply be TARGET_CPUS
 928  */
 929 #ifdef CONFIG_SMP
 930 void __init setup_ioapic_dest(void)
 931 {
 932         int pin, ioapic, irq, irq_entry;
 933
 934         if (skip_ioapic_setup == 1)
 935                 return;
 936
 937         for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
 938                 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
 939                         irq_entry = find_irq_entry(ioapic, pin, mp_INT);
 940                         if (irq_entry == -1)
 941                                 continue;
 942                         irq = pin_2_irq(irq_entry, ioapic, pin);
 943                         set_ioapic_affinity_irq(irq, TARGET_CPUS);
 944                 }
 945
 946         }
 947 }
 948 #endif
 949
 950 /*
 951  * EISA Edge/Level control register, ELCR
 952  */
 953 static int EISA_ELCR(unsigned int irq)
 954 {
 955         if (irq < 16) {
 956                 unsigned int port = 0x4d0 + (irq >> 3);
 957                 return (inb(port) >> (irq & 7)) & 1;
 958         }
 959         apic_printk(APIC_VERBOSE, KERN_INFO
 960                         "Broken MPtable reports ISA irq %d\n", irq);
 961         return 0;
 962 }
 963
 964 /* EISA interrupts are always polarity zero and can be edge or level
 965  * trigger depending on the ELCR value.  If an interrupt is listed as
 966  * EISA conforming in the MP table, that means its trigger type must
 967  * be read in from the ELCR */
 968
 969 #define default_EISA_trigger(idx)       (EISA_ELCR(mp_irqs[idx].mpc_srcbusirq))
 970 #define default_EISA_polarity(idx)      (0)
 971
 972 /* ISA interrupts are always polarity zero edge triggered,
 973  * when listed as conforming in the MP table. */
 974
 975 #define default_ISA_trigger(idx)        (0)
 976 #define default_ISA_polarity(idx)       (0)
 977
 978 /* PCI interrupts are always polarity one level triggered,
 979  * when listed as conforming in the MP table. */
 980
 981 #define default_PCI_trigger(idx)        (1)
 982 #define default_PCI_polarity(idx)       (1)
 983
 984 /* MCA interrupts are always polarity zero level triggered,
 985  * when listed as conforming in the MP table. */
 986
 987 #define default_MCA_trigger(idx)        (1)
 988 #define default_MCA_polarity(idx)       (0)
 989
 990 /* NEC98 interrupts are always polarity zero edge triggered,
 991  * when listed as conforming in the MP table. */
 992
 993 #define default_NEC98_trigger(idx)     (0)
 994 #define default_NEC98_polarity(idx)    (0)
 995
 996 static int __init MPBIOS_polarity(int idx)
 997 {
 998         int bus = mp_irqs[idx].mpc_srcbus;
 999         int polarity;
1000
1001         /*
1002          * Determine IRQ line polarity (high active or low active):
1003          */
1004         switch (mp_irqs[idx].mpc_irqflag & 3)
1005         {
1006                 case 0: /* conforms, ie. bus-type dependent polarity */
1007                 {
1008                         switch (mp_bus_id_to_type[bus])
1009                         {
1010                                 case MP_BUS_ISA: /* ISA pin */
1011                                 {
1012                                         polarity = default_ISA_polarity(idx);
1013                                         break;
1014                                 }
1015                                 case MP_BUS_EISA: /* EISA pin */
1016                                 {
1017                                         polarity = default_EISA_polarity(idx);
1018                                         break;
1019                                 }
1020                                 case MP_BUS_PCI: /* PCI pin */
1021                                 {
1022                                         polarity = default_PCI_polarity(idx);
1023                                         break;
1024                                 }
1025                                 case MP_BUS_MCA: /* MCA pin */
1026                                 {
1027                                         polarity = default_MCA_polarity(idx);
1028                                         break;
1029                                 }
1030                                 case MP_BUS_NEC98: /* NEC 98 pin */
1031                                 {
1032                                         polarity = default_NEC98_polarity(idx);
1033                                         break;
1034                                 }
1035                                 default:
1036                                 {
1037                                         printk(KERN_WARNING "broken BIOS!!\n");
1038                                         polarity = 1;
1039                                         break;
1040                                 }
1041                         }
1042                         break;
1043                 }
1044                 case 1: /* high active */
1045                 {
1046                         polarity = 0;
1047                         break;
1048                 }
1049                 case 2: /* reserved */
1050                 {
1051                         printk(KERN_WARNING "broken BIOS!!\n");
1052                         polarity = 1;
1053                         break;
1054                 }
1055                 case 3: /* low active */
1056                 {
1057                         polarity = 1;
1058                         break;
1059                 }
1060                 default: /* invalid */
1061                 {
1062                         printk(KERN_WARNING "broken BIOS!!\n");
1063                         polarity = 1;
1064                         break;
1065                 }
1066         }
1067         return polarity;
1068 }
1069
1070 static int MPBIOS_trigger(int idx)
1071 {
1072         int bus = mp_irqs[idx].mpc_srcbus;
1073         int trigger;
1074
1075         /*
1076          * Determine IRQ trigger mode (edge or level sensitive):
1077          */
1078         switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
1079         {
1080                 case 0: /* conforms, ie. bus-type dependent */
1081                 {
1082                         switch (mp_bus_id_to_type[bus])
1083                         {
1084                                 case MP_BUS_ISA: /* ISA pin */
1085                                 {
1086                                         trigger = default_ISA_trigger(idx);
1087                                         break;
1088                                 }
1089                                 case MP_BUS_EISA: /* EISA pin */
1090                                 {
1091                                         trigger = default_EISA_trigger(idx);
1092                                         break;
1093                                 }
1094                                 case MP_BUS_PCI: /* PCI pin */
1095                                 {
1096                                         trigger = default_PCI_trigger(idx);
1097                                         break;
1098                                 }
1099                                 case MP_BUS_MCA: /* MCA pin */
1100                                 {
1101                                         trigger = default_MCA_trigger(idx);
1102                                         break;
1103                                 }
1104                                 case MP_BUS_NEC98: /* NEC 98 pin */
1105                                 {
1106                                         trigger = default_NEC98_trigger(idx);
1107                                         break;
1108                                 }
1109                                 default:
1110                                 {
1111                                         printk(KERN_WARNING "broken BIOS!!\n");
1112                                         trigger = 1;
1113                                         break;
1114                                 }
1115                         }
1116                         break;
1117                 }
1118                 case 1: /* edge */
1119                 {
1120                         trigger = 0;
1121                         break;
1122                 }
1123                 case 2: /* reserved */
1124                 {
1125                         printk(KERN_WARNING "broken BIOS!!\n");
1126                         trigger = 1;
1127                         break;
1128                 }
1129                 case 3: /* level */
1130                 {
1131                         trigger = 1;
1132                         break;
1133                 }
1134                 default: /* invalid */
1135                 {
1136                         printk(KERN_WARNING "broken BIOS!!\n");
1137                         trigger = 0;
1138                         break;
1139                 }
1140         }
1141         return trigger;
1142 }
1143
1144 static inline int irq_polarity(int idx)
1145 {
1146         return MPBIOS_polarity(idx);
1147 }
1148
1149 static inline int irq_trigger(int idx)
1150 {
1151         return MPBIOS_trigger(idx);
1152 }
1153
1154 static int pin_2_irq(int idx, int apic, int pin)
1155 {
1156         int irq, i;
1157         int bus = mp_irqs[idx].mpc_srcbus;
1158
1159         /*
1160          * Debugging check, we are in big trouble if this message pops up!
1161          */
1162         if (mp_irqs[idx].mpc_dstirq != pin)
1163                 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
1164
1165         switch (mp_bus_id_to_type[bus])
1166         {
1167                 case MP_BUS_ISA: /* ISA pin */
1168                 case MP_BUS_EISA:
1169                 case MP_BUS_MCA:
1170                 case MP_BUS_NEC98:
1171                 {
1172                         irq = mp_irqs[idx].mpc_srcbusirq;
1173                         break;
1174                 }
1175                 case MP_BUS_PCI: /* PCI pin */
1176                 {
1177                         /*
1178                          * PCI IRQs are mapped in order
1179                          */
1180                         i = irq = 0;
1181                         while (i < apic)
1182                                 irq += nr_ioapic_registers[i++];
1183                         irq += pin;
1184
1185                         /*
1186                          * For MPS mode, so far only needed by ES7000 platform
1187                          */
1188                         if (ioapic_renumber_irq)
1189                                 irq = ioapic_renumber_irq(apic, irq);
1190
1191                         break;
1192                 }
1193                 default:
1194                 {
1195                         printk(KERN_ERR "unknown bus type %d.\n",bus);
1196                         irq = 0;
1197                         break;
1198                 }
1199         }
1200
1201         /*
1202          * PCI IRQ command line redirection. Yes, limits are hardcoded.
1203          */
1204         if ((pin >= 16) && (pin <= 23)) {
1205                 if (pirq_entries[pin-16] != -1) {
1206                         if (!pirq_entries[pin-16]) {
1207                                 apic_printk(APIC_VERBOSE, KERN_DEBUG
1208                                                 "disabling PIRQ%d\n", pin-16);
1209                         } else {
1210                                 irq = pirq_entries[pin-16];
1211                                 apic_printk(APIC_VERBOSE, KERN_DEBUG
1212                                                 "using PIRQ%d -> IRQ %d\n",
1213                                                 pin-16, irq);
1214                         }
1215                 }
1216         }
1217         return irq;
1218 }
1219
1220 static inline int IO_APIC_irq_trigger(int irq)
1221 {
1222         int apic, idx, pin;
1223
1224         for (apic = 0; apic < nr_ioapics; apic++) {
1225                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1226                         idx = find_irq_entry(apic,pin,mp_INT);
1227                         if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin)))
1228                                 return irq_trigger(idx);
1229                 }
1230         }
1231         /*
1232          * nonexistent IRQs are edge default
1233          */
1234         return 0;
1235 }
1236
1237 /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
1238 u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
1239
1240 static int __assign_irq_vector(int irq)
1241 {
1242         static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
1243         int vector;
1244
1245         BUG_ON((unsigned)irq >= NR_IRQ_VECTORS);
1246
1247         if (irq_vector[irq] > 0)
1248                 return irq_vector[irq];
1249
1250         current_vector += 8;
1251         if (current_vector == SYSCALL_VECTOR)
1252                 current_vector += 8;
1253
1254         if (current_vector >= FIRST_SYSTEM_VECTOR) {
1255                 offset++;
1256                 if (!(offset % 8))
1257                         return -ENOSPC;
1258                 current_vector = FIRST_DEVICE_VECTOR + offset;
1259         }
1260
1261         vector = current_vector;
1262         irq_vector[irq] = vector;
1263
1264         return vector;
1265 }
1266
1267 static int assign_irq_vector(int irq)
1268 {
1269         unsigned long flags;
1270         int vector;
1271
1272         spin_lock_irqsave(&vector_lock, flags);
1273         vector = __assign_irq_vector(irq);
1274         spin_unlock_irqrestore(&vector_lock, flags);
1275
1276         return vector;
1277 }
1278 static struct irq_chip ioapic_chip;
1279
1280 #define IOAPIC_AUTO     -1
1281 #define IOAPIC_EDGE     0
1282 #define IOAPIC_LEVEL    1
1283
1284 static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
1285 {
1286         if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1287                         trigger == IOAPIC_LEVEL)
1288                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1289                                          handle_fasteoi_irq, "fasteoi");
1290         else
1291                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1292                                          handle_edge_irq, "edge");
1293         set_intr_gate(vector, interrupt[irq]);
1294 }
1295
1296 static void __init setup_IO_APIC_irqs(void)
1297 {
1298         struct IO_APIC_route_entry entry;
1299         int apic, pin, idx, irq, first_notcon = 1, vector;
1300         unsigned long flags;
1301
1302         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1303
1304         for (apic = 0; apic < nr_ioapics; apic++) {
1305         for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1306
1307                 /*
1308                  * add it to the IO-APIC irq-routing table:
1309                  */
1310                 memset(&entry,0,sizeof(entry));
1311
1312                 entry.delivery_mode = INT_DELIVERY_MODE;
1313                 entry.dest_mode = INT_DEST_MODE;
1314                 entry.mask = 0;                         /* enable IRQ */
1315                 entry.dest.logical.logical_dest =
1316                                         cpu_mask_to_apicid(TARGET_CPUS);
1317
1318                 idx = find_irq_entry(apic,pin,mp_INT);
1319                 if (idx == -1) {
1320                         if (first_notcon) {
1321                                 apic_printk(APIC_VERBOSE, KERN_DEBUG
1322                                                 " IO-APIC (apicid-pin) %d-%d",
1323                                                 mp_ioapics[apic].mpc_apicid,
1324                                                 pin);
1325                                 first_notcon = 0;
1326                         } else
1327                                 apic_printk(APIC_VERBOSE, ", %d-%d",
1328                                         mp_ioapics[apic].mpc_apicid, pin);
1329                         continue;
1330                 }
1331
1332                 entry.trigger = irq_trigger(idx);
1333                 entry.polarity = irq_polarity(idx);
1334
1335                 if (irq_trigger(idx)) {
1336                         entry.trigger = 1;
1337                         entry.mask = 1;
1338                 }
1339
1340                 irq = pin_2_irq(idx, apic, pin);
1341                 /*
1342                  * skip adding the timer int on secondary nodes, which causes
1343                  * a small but painful rift in the time-space continuum
1344                  */
1345                 if (multi_timer_check(apic, irq))
1346                         continue;
1347                 else
1348                         add_pin_to_irq(irq, apic, pin);
1349
1350                 if (!apic && !IO_APIC_IRQ(irq))
1351                         continue;
1352
1353                 if (IO_APIC_IRQ(irq)) {
1354                         vector = assign_irq_vector(irq);
1355                         entry.vector = vector;
1356                         ioapic_register_intr(irq, vector, IOAPIC_AUTO);
1357
1358                         if (!apic && (irq < 16))
1359                                 disable_8259A_irq(irq);
1360                 }
1361                 ioapic_write_entry(apic, pin, entry);
1362                 spin_lock_irqsave(&ioapic_lock, flags);
1363                 set_native_irq_info(irq, TARGET_CPUS);
1364                 spin_unlock_irqrestore(&ioapic_lock, flags);
1365         }
1366         }
1367
1368         if (!first_notcon)
1369                 apic_printk(APIC_VERBOSE, " not connected.\n");
1370 }
1371
1372 /*
1373  * Set up the 8259A-master output pin:
1374  */
1375 static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
1376 {
1377         struct IO_APIC_route_entry entry;
1378
1379         memset(&entry,0,sizeof(entry));
1380
1381         disable_8259A_irq(0);
1382
1383         /* mask LVT0 */
1384         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1385
1386         /*
1387          * We use logical delivery to get the timer IRQ
1388          * to the first CPU.
1389          */
1390         entry.dest_mode = INT_DEST_MODE;
1391         entry.mask = 0;                                 /* unmask IRQ now */
1392         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
1393         entry.delivery_mode = INT_DELIVERY_MODE;
1394         entry.polarity = 0;
1395         entry.trigger = 0;
1396         entry.vector = vector;
1397
1398         /*
1399          * The timer IRQ doesn't have to know that behind the
1400          * scene we have a 8259A-master in AEOI mode ...
1401          */
1402         irq_desc[0].chip = &ioapic_chip;
1403         set_irq_handler(0, handle_edge_irq);
1404
1405         /*
1406          * Add it to the IO-APIC irq-routing table:
1407          */
1408         ioapic_write_entry(apic, pin, entry);
1409
1410         enable_8259A_irq(0);
1411 }
1412
1413 static inline void UNEXPECTED_IO_APIC(void)
1414 {
1415 }
1416
1417 void __init print_IO_APIC(void)
1418 {
1419         int apic, i;
1420         union IO_APIC_reg_00 reg_00;
1421         union IO_APIC_reg_01 reg_01;
1422         union IO_APIC_reg_02 reg_02;
1423         union IO_APIC_reg_03 reg_03;
1424         unsigned long flags;
1425
1426         if (apic_verbosity == APIC_QUIET)
1427                 return;
1428
1429         printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1430         for (i = 0; i < nr_ioapics; i++)
1431                 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1432                        mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
1433
1434         /*
1435          * We are a bit conservative about what we expect.  We have to
1436          * know about every hardware change ASAP.
1437          */
1438         printk(KERN_INFO "testing the IO APIC.......................\n");
1439
1440         for (apic = 0; apic < nr_ioapics; apic++) {
1441
1442         spin_lock_irqsave(&ioapic_lock, flags);
1443         reg_00.raw = io_apic_read(apic, 0);
1444         reg_01.raw = io_apic_read(apic, 1);
1445         if (reg_01.bits.version >= 0x10)
1446                 reg_02.raw = io_apic_read(apic, 2);
1447         if (reg_01.bits.version >= 0x20)
1448                 reg_03.raw = io_apic_read(apic, 3);
1449         spin_unlock_irqrestore(&ioapic_lock, flags);
1450
1451         printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
1452         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1453         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
1454         printk(KERN_DEBUG ".......    : Delivery Type: %X\n", reg_00.bits.delivery_type);
1455         printk(KERN_DEBUG ".......    : LTS          : %X\n", reg_00.bits.LTS);
1456         if (reg_00.bits.ID >= get_physical_broadcast())
1457                 UNEXPECTED_IO_APIC();
1458         if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
1459                 UNEXPECTED_IO_APIC();
1460
1461         printk(KERN_DEBUG ".... register #01: %08X\n", reg_01.raw);
1462         printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);
1463         if (    (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
1464                 (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
1465                 (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
1466                 (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
1467                 (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
1468                 (reg_01.bits.entries != 0x2E) &&
1469                 (reg_01.bits.entries != 0x3F)
1470         )
1471                 UNEXPECTED_IO_APIC();
1472
1473         printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
1474         printk(KERN_DEBUG ".......     : IO APIC version: %04X\n", reg_01.bits.version);
1475         if (    (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
1476                 (reg_01.bits.version != 0x10) && /* oldest IO-APICs */
1477                 (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
1478                 (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
1479                 (reg_01.bits.version != 0x20)    /* Intel P64H (82806 AA) */
1480         )
1481                 UNEXPECTED_IO_APIC();
1482         if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
1483                 UNEXPECTED_IO_APIC();
1484
1485         /*
1486          * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1487          * but the value of reg_02 is read as the previous read register
1488          * value, so ignore it if reg_02 == reg_01.
1489          */
1490         if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1491                 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1492                 printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
1493                 if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
1494                         UNEXPECTED_IO_APIC();
1495         }
1496
1497         /*
1498          * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1499          * or reg_03, but the value of reg_0[23] is read as the previous read
1500          * register value, so ignore it if reg_03 == reg_0[12].
1501          */
1502         if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1503             reg_03.raw != reg_01.raw) {
1504                 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1505                 printk(KERN_DEBUG ".......     : Boot DT    : %X\n", reg_03.bits.boot_DT);
1506                 if (reg_03.bits.__reserved_1)
1507                         UNEXPECTED_IO_APIC();
1508         }
1509
1510         printk(KERN_DEBUG ".... IRQ redirection table:\n");
1511
1512         printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol"
1513                           " Stat Dest Deli Vect:   \n");
1514
1515         for (i = 0; i <= reg_01.bits.entries; i++) {
1516                 struct IO_APIC_route_entry entry;
1517
1518                 entry = ioapic_read_entry(apic, i);
1519
1520                 printk(KERN_DEBUG " %02x %03X %02X  ",
1521                         i,
1522                         entry.dest.logical.logical_dest,
1523                         entry.dest.physical.physical_dest
1524                 );
1525
1526                 printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
1527                         entry.mask,
1528                         entry.trigger,
1529                         entry.irr,
1530                         entry.polarity,
1531                         entry.delivery_status,
1532                         entry.dest_mode,
1533                         entry.delivery_mode,
1534                         entry.vector
1535                 );
1536         }
1537         }
1538         printk(KERN_DEBUG "IRQ to pin mappings:\n");
1539         for (i = 0; i < NR_IRQS; i++) {
1540                 struct irq_pin_list *entry = irq_2_pin + i;
1541                 if (entry->pin < 0)
1542                         continue;
1543                 printk(KERN_DEBUG "IRQ%d ", i);
1544                 for (;;) {
1545                         printk("-> %d:%d", entry->apic, entry->pin);
1546                         if (!entry->next)
1547                                 break;
1548                         entry = irq_2_pin + entry->next;
1549                 }
1550                 printk("\n");
1551         }
1552
1553         printk(KERN_INFO ".................................... done.\n");
1554
1555         return;
1556 }
1557
1558 #if 0
1559
1560 static void print_APIC_bitfield (int base)
1561 {
1562         unsigned int v;
1563         int i, j;
1564
1565         if (apic_verbosity == APIC_QUIET)
1566                 return;
1567
1568         printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1569         for (i = 0; i < 8; i++) {
1570                 v = apic_read(base + i*0x10);
1571                 for (j = 0; j < 32; j++) {
1572                         if (v & (1<<j))
1573                                 printk("1");
1574                         else
1575                                 printk("0");
1576                 }
1577                 printk("\n");
1578         }
1579 }
1580
1581 void /*__init*/ print_local_APIC(void * dummy)
1582 {
1583         unsigned int v, ver, maxlvt;
1584
1585         if (apic_verbosity == APIC_QUIET)
1586                 return;
1587
1588         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1589                 smp_processor_id(), hard_smp_processor_id());
1590         v = apic_read(APIC_ID);
1591         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(v));
1592         v = apic_read(APIC_LVR);
1593         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1594         ver = GET_APIC_VERSION(v);
1595         maxlvt = get_maxlvt();
1596
1597         v = apic_read(APIC_TASKPRI);
1598         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1599
1600         if (APIC_INTEGRATED(ver)) {                     /* !82489DX */
1601                 v = apic_read(APIC_ARBPRI);
1602                 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1603                         v & APIC_ARBPRI_MASK);
1604                 v = apic_read(APIC_PROCPRI);
1605                 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1606         }
1607
1608         v = apic_read(APIC_EOI);
1609         printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1610         v = apic_read(APIC_RRR);
1611         printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1612         v = apic_read(APIC_LDR);
1613         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1614         v = apic_read(APIC_DFR);
1615         printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1616         v = apic_read(APIC_SPIV);
1617         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1618
1619         printk(KERN_DEBUG "... APIC ISR field:\n");
1620         print_APIC_bitfield(APIC_ISR);
1621         printk(KERN_DEBUG "... APIC TMR field:\n");
1622         print_APIC_bitfield(APIC_TMR);
1623         printk(KERN_DEBUG "... APIC IRR field:\n");
1624         print_APIC_bitfield(APIC_IRR);
1625
1626         if (APIC_INTEGRATED(ver)) {             /* !82489DX */
1627                 if (maxlvt > 3)         /* Due to the Pentium erratum 3AP. */
1628                         apic_write(APIC_ESR, 0);
1629                 v = apic_read(APIC_ESR);
1630                 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1631         }
1632
1633         v = apic_read(APIC_ICR);
1634         printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1635         v = apic_read(APIC_ICR2);
1636         printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1637
1638         v = apic_read(APIC_LVTT);
1639         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1640
1641         if (maxlvt > 3) {                       /* PC is LVT#4. */
1642                 v = apic_read(APIC_LVTPC);
1643                 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1644         }
1645         v = apic_read(APIC_LVT0);
1646         printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1647         v = apic_read(APIC_LVT1);
1648         printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1649
1650         if (maxlvt > 2) {                       /* ERR is LVT#3. */
1651                 v = apic_read(APIC_LVTERR);
1652                 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1653         }
1654
1655         v = apic_read(APIC_TMICT);
1656         printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1657         v = apic_read(APIC_TMCCT);
1658         printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1659         v = apic_read(APIC_TDCR);
1660         printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1661         printk("\n");
1662 }
1663
1664 void print_all_local_APICs (void)
1665 {
1666         on_each_cpu(print_local_APIC, NULL, 1, 1);
1667 }
1668
1669 void /*__init*/ print_PIC(void)
1670 {
1671         unsigned int v;
1672         unsigned long flags;
1673
1674         if (apic_verbosity == APIC_QUIET)
1675                 return;
1676
1677         printk(KERN_DEBUG "\nprinting PIC contents\n");
1678
1679         spin_lock_irqsave(&i8259A_lock, flags);
1680
1681         v = inb(0xa1) << 8 | inb(0x21);
1682         printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
1683
1684         v = inb(0xa0) << 8 | inb(0x20);
1685         printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
1686
1687         outb(0x0b,0xa0);
1688         outb(0x0b,0x20);
1689         v = inb(0xa0) << 8 | inb(0x20);
1690         outb(0x0a,0xa0);
1691         outb(0x0a,0x20);
1692
1693         spin_unlock_irqrestore(&i8259A_lock, flags);
1694
1695         printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
1696
1697         v = inb(0x4d1) << 8 | inb(0x4d0);
1698         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1699 }
1700
1701 #endif  /*  0  */
1702
1703 static void __init enable_IO_APIC(void)
1704 {
1705         union IO_APIC_reg_01 reg_01;
1706         int i8259_apic, i8259_pin;
1707         int i, apic;
1708         unsigned long flags;
1709
1710         for (i = 0; i < PIN_MAP_SIZE; i++) {
1711                 irq_2_pin[i].pin = -1;
1712                 irq_2_pin[i].next = 0;
1713         }
1714         if (!pirqs_enabled)
1715                 for (i = 0; i < MAX_PIRQS; i++)
1716                         pirq_entries[i] = -1;
1717
1718         /*
1719          * The number of IO-APIC IRQ registers (== #pins):
1720          */
1721         for (apic = 0; apic < nr_ioapics; apic++) {
1722                 spin_lock_irqsave(&ioapic_lock, flags);
1723                 reg_01.raw = io_apic_read(apic, 1);
1724                 spin_unlock_irqrestore(&ioapic_lock, flags);
1725                 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1726         }
1727         for(apic = 0; apic < nr_ioapics; apic++) {
1728                 int pin;
1729                 /* See if any of the pins is in ExtINT mode */
1730                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1731                         struct IO_APIC_route_entry entry;
1732                         entry = ioapic_read_entry(apic, pin);
1733
1734
1735                         /* If the interrupt line is enabled and in ExtInt mode
1736                          * I have found the pin where the i8259 is connected.
1737                          */
1738                         if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1739                                 ioapic_i8259.apic = apic;
1740                                 ioapic_i8259.pin  = pin;
1741                                 goto found_i8259;
1742                         }
1743                 }
1744         }
1745  found_i8259:
1746         /* Look to see what if the MP table has reported the ExtINT */
1747         /* If we could not find the appropriate pin by looking at the ioapic
1748          * the i8259 probably is not connected the ioapic but give the
1749          * mptable a chance anyway.
1750          */
1751         i8259_pin  = find_isa_irq_pin(0, mp_ExtINT);
1752         i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1753         /* Trust the MP table if nothing is setup in the hardware */
1754         if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1755                 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1756                 ioapic_i8259.pin  = i8259_pin;
1757                 ioapic_i8259.apic = i8259_apic;
1758         }
1759         /* Complain if the MP table and the hardware disagree */
1760         if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1761                 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1762         {
1763                 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1764         }
1765
1766         /*
1767          * Do not trust the IO-APIC being empty at bootup
1768          */
1769         clear_IO_APIC();
1770 }
1771
1772 /*
1773  * Not an __init, needed by the reboot code
1774  */
1775 void disable_IO_APIC(void)
1776 {
1777         /*
1778          * Clear the IO-APIC before rebooting:
1779          */
1780         clear_IO_APIC();
1781
1782         /*
1783          * If the i8259 is routed through an IOAPIC
1784          * Put that IOAPIC in virtual wire mode
1785          * so legacy interrupts can be delivered.
1786          */
1787         if (ioapic_i8259.pin != -1) {
1788                 struct IO_APIC_route_entry entry;
1789
1790                 memset(&entry, 0, sizeof(entry));
1791                 entry.mask            = 0; /* Enabled */
1792                 entry.trigger         = 0; /* Edge */
1793                 entry.irr             = 0;
1794                 entry.polarity        = 0; /* High */
1795                 entry.delivery_status = 0;
1796                 entry.dest_mode       = 0; /* Physical */
1797                 entry.delivery_mode   = dest_ExtINT; /* ExtInt */
1798                 entry.vector          = 0;
1799                 entry.dest.physical.physical_dest =
1800                                         GET_APIC_ID(apic_read(APIC_ID));
1801
1802                 /*
1803                  * Add it to the IO-APIC irq-routing table:
1804                  */
1805                 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1806         }
1807         disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1808 }
1809
1810 /*
1811  * function to set the IO-APIC physical IDs based on the
1812  * values stored in the MPC table.
1813  *
1814  * by Matt Domsch <Matt_Domsch@dell.com>  Tue Dec 21 12:25:05 CST 1999
1815  */
1816
1817 #ifndef CONFIG_X86_NUMAQ
1818 static void __init setup_ioapic_ids_from_mpc(void)
1819 {
1820         union IO_APIC_reg_00 reg_00;
1821         physid_mask_t phys_id_present_map;
1822         int apic;
1823         int i;
1824         unsigned char old_id;
1825         unsigned long flags;
1826
1827         /*
1828          * Don't check I/O APIC IDs for xAPIC systems.  They have
1829          * no meaning without the serial APIC bus.
1830          */
1831         if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
1832                 || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
1833                 return;
1834         /*
1835          * This is broken; anything with a real cpu count has to
1836          * circumvent this idiocy regardless.
1837          */
1838         phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map);
1839
1840         /*
1841          * Set the IOAPIC ID to the value stored in the MPC table.
1842          */
1843         for (apic = 0; apic < nr_ioapics; apic++) {
1844
1845                 /* Read the register 0 value */
1846                 spin_lock_irqsave(&ioapic_lock, flags);
1847                 reg_00.raw = io_apic_read(apic, 0);
1848                 spin_unlock_irqrestore(&ioapic_lock, flags);
1849
1850                 old_id = mp_ioapics[apic].mpc_apicid;
1851
1852                 if (mp_ioapics[apic].mpc_apicid >= get_physical_broadcast()) {
1853                         printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
1854                                 apic, mp_ioapics[apic].mpc_apicid);
1855                         printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1856                                 reg_00.bits.ID);
1857                         mp_ioapics[apic].mpc_apicid = reg_00.bits.ID;
1858                 }
1859
1860                 /*
1861                  * Sanity check, is the ID really free? Every APIC in a
1862                  * system must have a unique ID or we get lots of nice
1863                  * 'stuck on smp_invalidate_needed IPI wait' messages.
1864                  */
1865                 if (check_apicid_used(phys_id_present_map,
1866                                         mp_ioapics[apic].mpc_apicid)) {
1867                         printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
1868                                 apic, mp_ioapics[apic].mpc_apicid);
1869                         for (i = 0; i < get_physical_broadcast(); i++)
1870                                 if (!physid_isset(i, phys_id_present_map))
1871                                         break;
1872                         if (i >= get_physical_broadcast())
1873                                 panic("Max APIC ID exceeded!\n");
1874                         printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1875                                 i);
1876                         physid_set(i, phys_id_present_map);
1877                         mp_ioapics[apic].mpc_apicid = i;
1878                 } else {
1879                         physid_mask_t tmp;
1880                         tmp = apicid_to_cpu_present(mp_ioapics[apic].mpc_apicid);
1881                         apic_printk(APIC_VERBOSE, "Setting %d in the "
1882                                         "phys_id_present_map\n",
1883                                         mp_ioapics[apic].mpc_apicid);
1884                         physids_or(phys_id_present_map, phys_id_present_map, tmp);
1885                 }
1886
1887
1888                 /*
1889                  * We need to adjust the IRQ routing table
1890                  * if the ID changed.
1891                  */
1892                 if (old_id != mp_ioapics[apic].mpc_apicid)
1893                         for (i = 0; i < mp_irq_entries; i++)
1894                                 if (mp_irqs[i].mpc_dstapic == old_id)
1895                                         mp_irqs[i].mpc_dstapic
1896                                                 = mp_ioapics[apic].mpc_apicid;
1897
1898                 /*
1899                  * Read the right value from the MPC table and
1900                  * write it into the ID register.
1901                  */
1902                 apic_printk(APIC_VERBOSE, KERN_INFO
1903                         "...changing IO-APIC physical APIC ID to %d ...",
1904                         mp_ioapics[apic].mpc_apicid);
1905
1906                 reg_00.bits.ID = mp_ioapics[apic].mpc_apicid;
1907                 spin_lock_irqsave(&ioapic_lock, flags);
1908                 io_apic_write(apic, 0, reg_00.raw);
1909                 spin_unlock_irqrestore(&ioapic_lock, flags);
1910
1911                 /*
1912                  * Sanity check
1913                  */
1914                 spin_lock_irqsave(&ioapic_lock, flags);
1915                 reg_00.raw = io_apic_read(apic, 0);
1916                 spin_unlock_irqrestore(&ioapic_lock, flags);
1917                 if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid)
1918                         printk("could not set ID!\n");
1919                 else
1920                         apic_printk(APIC_VERBOSE, " ok.\n");
1921         }
1922 }
1923 #else
1924 static void __init setup_ioapic_ids_from_mpc(void) { }
1925 #endif
1926
1927 /*
1928  * There is a nasty bug in some older SMP boards, their mptable lies
1929  * about the timer IRQ. We do the following to work around the situation:
1930  *
1931  *      - timer IRQ defaults to IO-APIC IRQ
1932  *      - if this function detects that timer IRQs are defunct, then we fall
1933  *        back to ISA timer IRQs
1934  */
1935 static int __init timer_irq_works(void)
1936 {
1937         unsigned long t1 = jiffies;
1938
1939         local_irq_enable();
1940         /* Let ten ticks pass... */
1941         mdelay((10 * 1000) / HZ);
1942
1943         /*
1944          * Expect a few ticks at least, to be sure some possible
1945          * glue logic does not lock up after one or two first
1946          * ticks in a non-ExtINT mode.  Also the local APIC
1947          * might have cached one ExtINT interrupt.  Finally, at
1948          * least one tick may be lost due to delays.
1949          */
1950         if (jiffies - t1 > 4)
1951                 return 1;
1952
1953         return 0;
1954 }
1955
1956 /*
1957  * In the SMP+IOAPIC case it might happen that there are an unspecified
1958  * number of pending IRQ events unhandled. These cases are very rare,
1959  * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1960  * better to do it this way as thus we do not have to be aware of
1961  * 'pending' interrupts in the IRQ path, except at this point.
1962  */
1963 /*
1964  * Edge triggered needs to resend any interrupt
1965  * that was delayed but this is now handled in the device
1966  * independent code.
1967  */
1968
1969 /*
1970  * Startup quirk:
1971  *
1972  * Starting up a edge-triggered IO-APIC interrupt is
1973  * nasty - we need to make sure that we get the edge.
1974  * If it is already asserted for some reason, we need
1975  * return 1 to indicate that is was pending.
1976  *
1977  * This is not complete - we should be able to fake
1978  * an edge even if it isn't on the 8259A...
1979  *
1980  * (We do this for level-triggered IRQs too - it cannot hurt.)
1981  */
1982 static unsigned int startup_ioapic_irq(unsigned int irq)
1983 {
1984         int was_pending = 0;
1985         unsigned long flags;
1986
1987         spin_lock_irqsave(&ioapic_lock, flags);
1988         if (irq < 16) {
1989                 disable_8259A_irq(irq);
1990                 if (i8259A_irq_pending(irq))
1991                         was_pending = 1;
1992         }
1993         __unmask_IO_APIC_irq(irq);
1994         spin_unlock_irqrestore(&ioapic_lock, flags);
1995
1996         return was_pending;
1997 }
1998
1999 static void ack_ioapic_irq(unsigned int irq)
2000 {
2001         move_native_irq(irq);
2002         ack_APIC_irq();
2003 }
2004
2005 static void ack_ioapic_quirk_irq(unsigned int irq)
2006 {
2007         unsigned long v;
2008         int i;
2009
2010         move_native_irq(irq);
2011 /*
2012  * It appears there is an erratum which affects at least version 0x11
2013  * of I/O APIC (that's the 82093AA and cores integrated into various
2014  * chipsets).  Under certain conditions a level-triggered interrupt is
2015  * erroneously delivered as edge-triggered one but the respective IRR
2016  * bit gets set nevertheless.  As a result the I/O unit expects an EOI
2017  * message but it will never arrive and further interrupts are blocked
2018  * from the source.  The exact reason is so far unknown, but the
2019  * phenomenon was observed when two consecutive interrupt requests
2020  * from a given source get delivered to the same CPU and the source is
2021  * temporarily disabled in between.
2022  *
2023  * A workaround is to simulate an EOI message manually.  We achieve it
2024  * by setting the trigger mode to edge and then to level when the edge
2025  * trigger mode gets detected in the TMR of a local APIC for a
2026  * level-triggered interrupt.  We mask the source for the time of the
2027  * operation to prevent an edge-triggered interrupt escaping meanwhile.
2028  * The idea is from Manfred Spraul.  --macro
2029  */
2030         i = irq_vector[irq];
2031
2032         v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
2033
2034         ack_APIC_irq();
2035
2036         if (!(v & (1 << (i & 0x1f)))) {
2037                 atomic_inc(&irq_mis_count);
2038                 spin_lock(&ioapic_lock);
2039                 __mask_and_edge_IO_APIC_irq(irq);
2040                 __unmask_and_level_IO_APIC_irq(irq);
2041                 spin_unlock(&ioapic_lock);
2042         }
2043 }
2044
2045 static int ioapic_retrigger_irq(unsigned int irq)
2046 {
2047         send_IPI_self(irq_vector[irq]);
2048
2049         return 1;
2050 }
2051
2052 static struct irq_chip ioapic_chip __read_mostly = {
2053         .name           = "IO-APIC",
2054         .startup        = startup_ioapic_irq,
2055         .mask           = mask_IO_APIC_irq,
2056         .unmask         = unmask_IO_APIC_irq,
2057         .ack            = ack_ioapic_irq,
2058         .eoi            = ack_ioapic_quirk_irq,
2059 #ifdef CONFIG_SMP
2060         .set_affinity   = set_ioapic_affinity_irq,
2061 #endif
2062         .retrigger      = ioapic_retrigger_irq,
2063 };
2064
2065
2066 static inline void init_IO_APIC_traps(void)
2067 {
2068         int irq;
2069
2070         /*
2071          * NOTE! The local APIC isn't very good at handling
2072          * multiple interrupts at the same interrupt level.
2073          * As the interrupt level is determined by taking the
2074          * vector number and shifting that right by 4, we
2075          * want to spread these out a bit so that they don't
2076          * all fall in the same interrupt level.
2077          *
2078          * Also, we've got to be careful not to trash gate
2079          * 0x80, because int 0x80 is hm, kind of importantish. ;)
2080          */
2081         for (irq = 0; irq < NR_IRQS ; irq++) {
2082                 int tmp = irq;
2083                 if (IO_APIC_IRQ(tmp) && !irq_vector[tmp]) {
2084                         /*
2085                          * Hmm.. We don't have an entry for this,
2086                          * so default to an old-fashioned 8259
2087                          * interrupt if we can..
2088                          */
2089                         if (irq < 16)
2090                                 make_8259A_irq(irq);
2091                         else
2092                                 /* Strange. Oh, well.. */
2093                                 irq_desc[irq].chip = &no_irq_chip;
2094                 }
2095         }
2096 }
2097
2098 /*
2099  * The local APIC irq-chip implementation:
2100  */
2101
2102 static void ack_apic(unsigned int irq)
2103 {
2104         ack_APIC_irq();
2105 }
2106
2107 static void mask_lapic_irq (unsigned int irq)
2108 {
2109         unsigned long v;
2110
2111         v = apic_read(APIC_LVT0);
2112         apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED);
2113 }
2114
2115 static void unmask_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 struct irq_chip lapic_chip __read_mostly = {
2124         .name           = "local-APIC-edge",
2125         .mask           = mask_lapic_irq,
2126         .unmask         = unmask_lapic_irq,
2127         .eoi            = ack_apic,
2128 };
2129
2130 static void setup_nmi (void)
2131 {
2132         /*
2133          * Dirty trick to enable the NMI watchdog ...
2134          * We put the 8259A master into AEOI mode and
2135          * unmask on all local APICs LVT0 as NMI.
2136          *
2137          * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2138          * is from Maciej W. Rozycki - so we do not have to EOI from
2139          * the NMI handler or the timer interrupt.
2140          */
2141         apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
2142
2143         on_each_cpu(enable_NMI_through_LVT0, NULL, 1, 1);
2144
2145         apic_printk(APIC_VERBOSE, " done.\n");
2146 }
2147
2148 /*
2149  * This looks a bit hackish but it's about the only one way of sending
2150  * a few INTA cycles to 8259As and any associated glue logic.  ICR does
2151  * not support the ExtINT mode, unfortunately.  We need to send these
2152  * cycles as some i82489DX-based boards have glue logic that keeps the
2153  * 8259A interrupt line asserted until INTA.  --macro
2154  */
2155 static inline void unlock_ExtINT_logic(void)
2156 {
2157         int apic, pin, i;
2158         struct IO_APIC_route_entry entry0, entry1;
2159         unsigned char save_control, save_freq_select;
2160
2161         pin  = find_isa_irq_pin(8, mp_INT);
2162         apic = find_isa_irq_apic(8, mp_INT);
2163         if (pin == -1)
2164                 return;
2165
2166         entry0 = ioapic_read_entry(apic, pin);
2167         clear_IO_APIC_pin(apic, pin);
2168
2169         memset(&entry1, 0, sizeof(entry1));
2170
2171         entry1.dest_mode = 0;                   /* physical delivery */
2172         entry1.mask = 0;                        /* unmask IRQ now */
2173         entry1.dest.physical.physical_dest = hard_smp_processor_id();
2174         entry1.delivery_mode = dest_ExtINT;
2175         entry1.polarity = entry0.polarity;
2176         entry1.trigger = 0;
2177         entry1.vector = 0;
2178
2179         ioapic_write_entry(apic, pin, entry1);
2180
2181         save_control = CMOS_READ(RTC_CONTROL);
2182         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2183         CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2184                    RTC_FREQ_SELECT);
2185         CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2186
2187         i = 100;
2188         while (i-- > 0) {
2189                 mdelay(10);
2190                 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2191                         i -= 10;
2192         }
2193
2194         CMOS_WRITE(save_control, RTC_CONTROL);
2195         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2196         clear_IO_APIC_pin(apic, pin);
2197
2198         ioapic_write_entry(apic, pin, entry0);
2199 }
2200
2201 int timer_uses_ioapic_pin_0;
2202
2203 /*
2204  * This code may look a bit paranoid, but it's supposed to cooperate with
2205  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
2206  * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
2207  * fanatically on his truly buggy board.
2208  */
2209 static inline void check_timer(void)
2210 {
2211         int apic1, pin1, apic2, pin2;
2212         int vector;
2213
2214         /*
2215          * get/set the timer IRQ vector:
2216          */
2217         disable_8259A_irq(0);
2218         vector = assign_irq_vector(0);
2219         set_intr_gate(vector, interrupt[0]);
2220
2221         /*
2222          * Subtle, code in do_timer_interrupt() expects an AEOI
2223          * mode for the 8259A whenever interrupts are routed
2224          * through I/O APICs.  Also IRQ0 has to be enabled in
2225          * the 8259A which implies the virtual wire has to be
2226          * disabled in the local APIC.
2227          */
2228         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2229         init_8259A(1);
2230         timer_ack = 1;
2231         if (timer_over_8254 > 0)
2232                 enable_8259A_irq(0);
2233
2234         pin1  = find_isa_irq_pin(0, mp_INT);
2235         apic1 = find_isa_irq_apic(0, mp_INT);
2236         pin2  = ioapic_i8259.pin;
2237         apic2 = ioapic_i8259.apic;
2238
2239         if (pin1 == 0)
2240                 timer_uses_ioapic_pin_0 = 1;
2241
2242         printk(KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
2243                 vector, apic1, pin1, apic2, pin2);
2244
2245         if (pin1 != -1) {
2246                 /*
2247                  * Ok, does IRQ0 through the IOAPIC work?
2248                  */
2249                 unmask_IO_APIC_irq(0);
2250                 if (timer_irq_works()) {
2251                         if (nmi_watchdog == NMI_IO_APIC) {
2252                                 disable_8259A_irq(0);
2253                                 setup_nmi();
2254                                 enable_8259A_irq(0);
2255                         }
2256                         if (disable_timer_pin_1 > 0)
2257                                 clear_IO_APIC_pin(0, pin1);
2258                         return;
2259                 }
2260                 clear_IO_APIC_pin(apic1, pin1);
2261                 printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to "
2262                                 "IO-APIC\n");
2263         }
2264
2265         printk(KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... ");
2266         if (pin2 != -1) {
2267                 printk("\n..... (found pin %d) ...", pin2);
2268                 /*
2269                  * legacy devices should be connected to IO APIC #0
2270                  */
2271                 setup_ExtINT_IRQ0_pin(apic2, pin2, vector);
2272                 if (timer_irq_works()) {
2273                         printk("works.\n");
2274                         if (pin1 != -1)
2275                                 replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
2276                         else
2277                                 add_pin_to_irq(0, apic2, pin2);
2278                         if (nmi_watchdog == NMI_IO_APIC) {
2279                                 setup_nmi();
2280                         }
2281                         return;
2282                 }
2283                 /*
2284                  * Cleanup, just in case ...
2285                  */
2286                 clear_IO_APIC_pin(apic2, pin2);
2287         }
2288         printk(" failed.\n");
2289
2290         if (nmi_watchdog == NMI_IO_APIC) {
2291                 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
2292                 nmi_watchdog = 0;
2293         }
2294
2295         printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
2296
2297         disable_8259A_irq(0);
2298         set_irq_chip_and_handler_name(0, &lapic_chip, handle_fasteoi_irq,
2299                                       "fasteio");
2300         apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector);   /* Fixed mode */
2301         enable_8259A_irq(0);
2302
2303         if (timer_irq_works()) {
2304                 printk(" works.\n");
2305                 return;
2306         }
2307         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
2308         printk(" failed.\n");
2309
2310         printk(KERN_INFO "...trying to set up timer as ExtINT IRQ...");
2311
2312         timer_ack = 0;
2313         init_8259A(0);
2314         make_8259A_irq(0);
2315         apic_write_around(APIC_LVT0, APIC_DM_EXTINT);
2316
2317         unlock_ExtINT_logic();
2318
2319         if (timer_irq_works()) {
2320                 printk(" works.\n");
2321                 return;
2322         }
2323         printk(" failed :(.\n");
2324         panic("IO-APIC + timer doesn't work!  Boot with apic=debug and send a "
2325                 "report.  Then try booting with the 'noapic' option");
2326 }
2327
2328 /*
2329  *
2330  * IRQ's that are handled by the PIC in the MPS IOAPIC case.
2331  * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
2332  *   Linux doesn't really care, as it's not actually used
2333  *   for any interrupt handling anyway.
2334  */
2335 #define PIC_IRQS        (1 << PIC_CASCADE_IR)
2336
2337 void __init setup_IO_APIC(void)
2338 {
2339         enable_IO_APIC();
2340
2341         if (acpi_ioapic)
2342                 io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
2343         else
2344                 io_apic_irqs = ~PIC_IRQS;
2345
2346         printk("ENABLING IO-APIC IRQs\n");
2347
2348         /*
2349          * Set up IO-APIC IRQ routing.
2350          */
2351         if (!acpi_ioapic)
2352                 setup_ioapic_ids_from_mpc();
2353         sync_Arb_IDs();
2354         setup_IO_APIC_irqs();
2355         init_IO_APIC_traps();
2356         check_timer();
2357         if (!acpi_ioapic)
2358                 print_IO_APIC();
2359 }
2360
2361 static int __init setup_disable_8254_timer(char *s)
2362 {
2363         timer_over_8254 = -1;
2364         return 1;
2365 }
2366 static int __init setup_enable_8254_timer(char *s)
2367 {
2368         timer_over_8254 = 2;
2369         return 1;
2370 }
2371
2372 __setup("disable_8254_timer", setup_disable_8254_timer);
2373 __setup("enable_8254_timer", setup_enable_8254_timer);
2374
2375 /*
2376  *      Called after all the initialization is done. If we didnt find any
2377  *      APIC bugs then we can allow the modify fast path
2378  */
2379
2380 static int __init io_apic_bug_finalize(void)
2381 {
2382         if(sis_apic_bug == -1)
2383                 sis_apic_bug = 0;
2384         return 0;
2385 }
2386
2387 late_initcall(io_apic_bug_finalize);
2388
2389 struct sysfs_ioapic_data {
2390         struct sys_device dev;
2391         struct IO_APIC_route_entry entry[0];
2392 };
2393 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
2394
2395 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
2396 {
2397         struct IO_APIC_route_entry *entry;
2398         struct sysfs_ioapic_data *data;
2399         int i;
2400
2401         data = container_of(dev, struct sysfs_ioapic_data, dev);
2402         entry = data->entry;
2403         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++)
2404                 entry[i] = ioapic_read_entry(dev->id, i);
2405
2406         return 0;
2407 }
2408
2409 static int ioapic_resume(struct sys_device *dev)
2410 {
2411         struct IO_APIC_route_entry *entry;
2412         struct sysfs_ioapic_data *data;
2413         unsigned long flags;
2414         union IO_APIC_reg_00 reg_00;
2415         int i;
2416
2417         data = container_of(dev, struct sysfs_ioapic_data, dev);
2418         entry = data->entry;
2419
2420         spin_lock_irqsave(&ioapic_lock, flags);
2421         reg_00.raw = io_apic_read(dev->id, 0);
2422         if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
2423                 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
2424                 io_apic_write(dev->id, 0, reg_00.raw);
2425         }
2426         spin_unlock_irqrestore(&ioapic_lock, flags);
2427         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++)
2428                 ioapic_write_entry(dev->id, i, entry[i]);
2429
2430         return 0;
2431 }
2432
2433 static struct sysdev_class ioapic_sysdev_class = {
2434         set_kset_name("ioapic"),
2435         .suspend = ioapic_suspend,
2436         .resume = ioapic_resume,
2437 };
2438
2439 static int __init ioapic_init_sysfs(void)
2440 {
2441         struct sys_device * dev;
2442         int i, size, error = 0;
2443
2444         error = sysdev_class_register(&ioapic_sysdev_class);
2445         if (error)
2446                 return error;
2447
2448         for (i = 0; i < nr_ioapics; i++ ) {
2449                 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
2450                         * sizeof(struct IO_APIC_route_entry);
2451                 mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
2452                 if (!mp_ioapic_data[i]) {
2453                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2454                         continue;
2455                 }
2456                 memset(mp_ioapic_data[i], 0, size);
2457                 dev = &mp_ioapic_data[i]->dev;
2458                 dev->id = i;
2459                 dev->cls = &ioapic_sysdev_class;
2460                 error = sysdev_register(dev);
2461                 if (error) {
2462                         kfree(mp_ioapic_data[i]);
2463                         mp_ioapic_data[i] = NULL;
2464                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2465                         continue;
2466                 }
2467         }
2468
2469         return 0;
2470 }
2471
2472 device_initcall(ioapic_init_sysfs);
2473
2474 /*
2475  * Dynamic irq allocate and deallocation
2476  */
2477 int create_irq(void)
2478 {
2479         /* Allocate an unused irq */
2480         int irq, new, vector;
2481         unsigned long flags;
2482
2483         irq = -ENOSPC;
2484         spin_lock_irqsave(&vector_lock, flags);
2485         for (new = (NR_IRQS - 1); new >= 0; new--) {
2486                 if (platform_legacy_irq(new))
2487                         continue;
2488                 if (irq_vector[new] != 0)
2489                         continue;
2490                 vector = __assign_irq_vector(new);
2491                 if (likely(vector > 0))
2492                         irq = new;
2493                 break;
2494         }
2495         spin_unlock_irqrestore(&vector_lock, flags);
2496
2497         if (irq >= 0) {
2498                 set_intr_gate(vector, interrupt[irq]);
2499                 dynamic_irq_init(irq);
2500         }
2501         return irq;
2502 }
2503
2504 void destroy_irq(unsigned int irq)
2505 {
2506         unsigned long flags;
2507
2508         dynamic_irq_cleanup(irq);
2509
2510         spin_lock_irqsave(&vector_lock, flags);
2511         irq_vector[irq] = 0;
2512         spin_unlock_irqrestore(&vector_lock, flags);
2513 }
2514
2515 /*
2516  * MSI mesage composition
2517  */
2518 #ifdef CONFIG_PCI_MSI
2519 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
2520 {
2521         int vector;
2522         unsigned dest;
2523
2524         vector = assign_irq_vector(irq);
2525         if (vector >= 0) {
2526                 dest = cpu_mask_to_apicid(TARGET_CPUS);
2527
2528                 msg->address_hi = MSI_ADDR_BASE_HI;
2529                 msg->address_lo =
2530                         MSI_ADDR_BASE_LO |
2531                         ((INT_DEST_MODE == 0) ?
2532                                 MSI_ADDR_DEST_MODE_PHYSICAL:
2533                                 MSI_ADDR_DEST_MODE_LOGICAL) |
2534                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2535                                 MSI_ADDR_REDIRECTION_CPU:
2536                                 MSI_ADDR_REDIRECTION_LOWPRI) |
2537                         MSI_ADDR_DEST_ID(dest);
2538
2539                 msg->data =
2540                         MSI_DATA_TRIGGER_EDGE |
2541                         MSI_DATA_LEVEL_ASSERT |
2542                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2543                                 MSI_DATA_DELIVERY_FIXED:
2544                                 MSI_DATA_DELIVERY_LOWPRI) |
2545                         MSI_DATA_VECTOR(vector);
2546         }
2547         return vector;
2548 }
2549
2550 #ifdef CONFIG_SMP
2551 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
2552 {
2553         struct msi_msg msg;
2554         unsigned int dest;
2555         cpumask_t tmp;
2556         int vector;
2557
2558         cpus_and(tmp, mask, cpu_online_map);
2559         if (cpus_empty(tmp))
2560                 tmp = TARGET_CPUS;
2561
2562         vector = assign_irq_vector(irq);
2563         if (vector < 0)
2564                 return;
2565
2566         dest = cpu_mask_to_apicid(mask);
2567
2568         read_msi_msg(irq, &msg);
2569
2570         msg.data &= ~MSI_DATA_VECTOR_MASK;
2571         msg.data |= MSI_DATA_VECTOR(vector);
2572         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
2573         msg.address_lo |= MSI_ADDR_DEST_ID(dest);
2574
2575         write_msi_msg(irq, &msg);
2576         set_native_irq_info(irq, mask);
2577 }
2578 #endif /* CONFIG_SMP */
2579
2580 /*
2581  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
2582  * which implement the MSI or MSI-X Capability Structure.
2583  */
2584 static struct irq_chip msi_chip = {
2585         .name           = "PCI-MSI",
2586         .unmask         = unmask_msi_irq,
2587         .mask           = mask_msi_irq,
2588         .ack            = ack_ioapic_irq,
2589 #ifdef CONFIG_SMP
2590         .set_affinity   = set_msi_irq_affinity,
2591 #endif
2592         .retrigger      = ioapic_retrigger_irq,
2593 };
2594
2595 int arch_setup_msi_irq(unsigned int irq, struct pci_dev *dev)
2596 {
2597         struct msi_msg msg;
2598         int ret;
2599         ret = msi_compose_msg(dev, irq, &msg);
2600         if (ret < 0)
2601                 return ret;
2602
2603         write_msi_msg(irq, &msg);
2604
2605         set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq,
2606                                       "edge");
2607
2608         return 0;
2609 }
2610
2611 void arch_teardown_msi_irq(unsigned int irq)
2612 {
2613         return;
2614 }
2615
2616 #endif /* CONFIG_PCI_MSI */
2617
2618 /*
2619  * Hypertransport interrupt support
2620  */
2621 #ifdef CONFIG_HT_IRQ
2622
2623 #ifdef CONFIG_SMP
2624
2625 static void target_ht_irq(unsigned int irq, unsigned int dest)
2626 {
2627         u32 low, high;
2628         low  = read_ht_irq_low(irq);
2629         high = read_ht_irq_high(irq);
2630
2631         low  &= ~(HT_IRQ_LOW_DEST_ID_MASK);
2632         high &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
2633
2634         low  |= HT_IRQ_LOW_DEST_ID(dest);
2635         high |= HT_IRQ_HIGH_DEST_ID(dest);
2636
2637         write_ht_irq_low(irq, low);
2638         write_ht_irq_high(irq, high);
2639 }
2640
2641 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2642 {
2643         unsigned int dest;
2644         cpumask_t tmp;
2645
2646         cpus_and(tmp, mask, cpu_online_map);
2647         if (cpus_empty(tmp))
2648                 tmp = TARGET_CPUS;
2649
2650         cpus_and(mask, tmp, CPU_MASK_ALL);
2651
2652         dest = cpu_mask_to_apicid(mask);
2653
2654         target_ht_irq(irq, dest);
2655         set_native_irq_info(irq, mask);
2656 }
2657 #endif
2658
2659 static struct irq_chip ht_irq_chip = {
2660         .name           = "PCI-HT",
2661         .mask           = mask_ht_irq,
2662         .unmask         = unmask_ht_irq,
2663         .ack            = ack_ioapic_irq,
2664 #ifdef CONFIG_SMP
2665         .set_affinity   = set_ht_irq_affinity,
2666 #endif
2667         .retrigger      = ioapic_retrigger_irq,
2668 };
2669
2670 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2671 {
2672         int vector;
2673
2674         vector = assign_irq_vector(irq);
2675         if (vector >= 0) {
2676                 u32 low, high;
2677                 unsigned dest;
2678                 cpumask_t tmp;
2679
2680                 cpus_clear(tmp);
2681                 cpu_set(vector >> 8, tmp);
2682                 dest = cpu_mask_to_apicid(tmp);
2683
2684                 high =  HT_IRQ_HIGH_DEST_ID(dest);
2685
2686                 low =   HT_IRQ_LOW_BASE |
2687                         HT_IRQ_LOW_DEST_ID(dest) |
2688                         HT_IRQ_LOW_VECTOR(vector) |
2689                         ((INT_DEST_MODE == 0) ?
2690                                 HT_IRQ_LOW_DM_PHYSICAL :
2691                                 HT_IRQ_LOW_DM_LOGICAL) |
2692                         HT_IRQ_LOW_RQEOI_EDGE |
2693                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2694                                 HT_IRQ_LOW_MT_FIXED :
2695                                 HT_IRQ_LOW_MT_ARBITRATED) |
2696                         HT_IRQ_LOW_IRQ_MASKED;
2697
2698                 write_ht_irq_low(irq, low);
2699                 write_ht_irq_high(irq, high);
2700
2701                 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2702                                               handle_edge_irq, "edge");
2703         }
2704         return vector;
2705 }
2706 #endif /* CONFIG_HT_IRQ */
2707
2708 /* --------------------------------------------------------------------------
2709                           ACPI-based IOAPIC Configuration
2710    -------------------------------------------------------------------------- */
2711
2712 #ifdef CONFIG_ACPI
2713
2714 int __init io_apic_get_unique_id (int ioapic, int apic_id)
2715 {
2716         union IO_APIC_reg_00 reg_00;
2717         static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
2718         physid_mask_t tmp;
2719         unsigned long flags;
2720         int i = 0;
2721
2722         /*
2723          * The P4 platform supports up to 256 APIC IDs on two separate APIC
2724          * buses (one for LAPICs, one for IOAPICs), where predecessors only
2725          * supports up to 16 on one shared APIC bus.
2726          *
2727          * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
2728          *      advantage of new APIC bus architecture.
2729          */
2730
2731         if (physids_empty(apic_id_map))
2732                 apic_id_map = ioapic_phys_id_map(phys_cpu_present_map);
2733
2734         spin_lock_irqsave(&ioapic_lock, flags);
2735         reg_00.raw = io_apic_read(ioapic, 0);
2736         spin_unlock_irqrestore(&ioapic_lock, flags);
2737
2738         if (apic_id >= get_physical_broadcast()) {
2739                 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
2740                         "%d\n", ioapic, apic_id, reg_00.bits.ID);
2741                 apic_id = reg_00.bits.ID;
2742         }
2743
2744         /*
2745          * Every APIC in a system must have a unique ID or we get lots of nice
2746          * 'stuck on smp_invalidate_needed IPI wait' messages.
2747          */
2748         if (check_apicid_used(apic_id_map, apic_id)) {
2749
2750                 for (i = 0; i < get_physical_broadcast(); i++) {
2751                         if (!check_apicid_used(apic_id_map, i))
2752                                 break;
2753                 }
2754
2755                 if (i == get_physical_broadcast())
2756                         panic("Max apic_id exceeded!\n");
2757
2758                 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
2759                         "trying %d\n", ioapic, apic_id, i);
2760
2761                 apic_id = i;
2762         }
2763
2764         tmp = apicid_to_cpu_present(apic_id);
2765         physids_or(apic_id_map, apic_id_map, tmp);
2766
2767         if (reg_00.bits.ID != apic_id) {
2768                 reg_00.bits.ID = apic_id;
2769
2770                 spin_lock_irqsave(&ioapic_lock, flags);
2771                 io_apic_write(ioapic, 0, reg_00.raw);
2772                 reg_00.raw = io_apic_read(ioapic, 0);
2773                 spin_unlock_irqrestore(&ioapic_lock, flags);
2774
2775                 /* Sanity check */
2776                 if (reg_00.bits.ID != apic_id) {
2777                         printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
2778                         return -1;
2779                 }
2780         }
2781
2782         apic_printk(APIC_VERBOSE, KERN_INFO
2783                         "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
2784
2785         return apic_id;
2786 }
2787
2788
2789 int __init io_apic_get_version (int ioapic)
2790 {
2791         union IO_APIC_reg_01    reg_01;
2792         unsigned long flags;
2793
2794         spin_lock_irqsave(&ioapic_lock, flags);
2795         reg_01.raw = io_apic_read(ioapic, 1);
2796         spin_unlock_irqrestore(&ioapic_lock, flags);
2797
2798         return reg_01.bits.version;
2799 }
2800
2801
2802 int __init io_apic_get_redir_entries (int ioapic)
2803 {
2804         union IO_APIC_reg_01    reg_01;
2805         unsigned long flags;
2806
2807         spin_lock_irqsave(&ioapic_lock, flags);
2808         reg_01.raw = io_apic_read(ioapic, 1);
2809         spin_unlock_irqrestore(&ioapic_lock, flags);
2810
2811         return reg_01.bits.entries;
2812 }
2813
2814
2815 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low)
2816 {
2817         struct IO_APIC_route_entry entry;
2818         unsigned long flags;
2819
2820         if (!IO_APIC_IRQ(irq)) {
2821                 printk(KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2822                         ioapic);
2823                 return -EINVAL;
2824         }
2825
2826         /*
2827          * Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
2828          * Note that we mask (disable) IRQs now -- these get enabled when the
2829          * corresponding device driver registers for this IRQ.
2830          */
2831
2832         memset(&entry,0,sizeof(entry));
2833
2834         entry.delivery_mode = INT_DELIVERY_MODE;
2835         entry.dest_mode = INT_DEST_MODE;
2836         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
2837         entry.trigger = edge_level;
2838         entry.polarity = active_high_low;
2839         entry.mask  = 1;
2840
2841         /*
2842          * IRQs < 16 are already in the irq_2_pin[] map
2843          */
2844         if (irq >= 16)
2845                 add_pin_to_irq(irq, ioapic, pin);
2846
2847         entry.vector = assign_irq_vector(irq);
2848
2849         apic_printk(APIC_DEBUG, KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry "
2850                 "(%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i)\n", ioapic,
2851                 mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq,
2852                 edge_level, active_high_low);
2853
2854         ioapic_register_intr(irq, entry.vector, edge_level);
2855
2856         if (!ioapic && (irq < 16))
2857                 disable_8259A_irq(irq);
2858
2859         ioapic_write_entry(ioapic, pin, entry);
2860         spin_lock_irqsave(&ioapic_lock, flags);
2861         set_native_irq_info(irq, TARGET_CPUS);
2862         spin_unlock_irqrestore(&ioapic_lock, flags);
2863
2864         return 0;
2865 }
2866
2867 #endif /* CONFIG_ACPI */
2868
2869 static int __init parse_disable_timer_pin_1(char *arg)
2870 {
2871         disable_timer_pin_1 = 1;
2872         return 0;
2873 }
2874 early_param("disable_timer_pin_1", parse_disable_timer_pin_1);
2875
2876 static int __init parse_enable_timer_pin_1(char *arg)
2877 {
2878         disable_timer_pin_1 = -1;
2879         return 0;
2880 }
2881 early_param("enable_timer_pin_1", parse_enable_timer_pin_1);
2882
2883 static int __init parse_noapic(char *arg)
2884 {
2885         /* disable IO-APIC */
2886         disable_ioapic_setup();
2887         return 0;
2888 }
2889 early_param("noapic", parse_noapic);