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