[PATCH] x86_64 irq: Add constants for the reserved IRQ vectors.
[linux-drm-fsl-dcu.git] / arch / x86_64 / kernel / io_apic.c
1 /*
2  *      Intel IO-APIC support for multi-Pentium hosts.
3  *
4  *      Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
5  *
6  *      Many thanks to Stig Venaas for trying out countless experimental
7  *      patches and reporting/debugging problems patiently!
8  *
9  *      (c) 1999, Multiple IO-APIC support, developed by
10  *      Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
11  *      Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
12  *      further tested and cleaned up by Zach Brown <zab@redhat.com>
13  *      and Ingo Molnar <mingo@redhat.com>
14  *
15  *      Fixes
16  *      Maciej W. Rozycki       :       Bits for genuine 82489DX APICs;
17  *                                      thanks to Eric Gilmore
18  *                                      and Rolf G. Tews
19  *                                      for testing these extensively
20  *      Paul Diefenbaugh        :       Added full ACPI support
21  */
22
23 #include <linux/mm.h>
24 #include <linux/interrupt.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/sched.h>
28 #include <linux/smp_lock.h>
29 #include <linux/pci.h>
30 #include <linux/mc146818rtc.h>
31 #include <linux/acpi.h>
32 #include <linux/sysdev.h>
33 #include <linux/msi.h>
34 #include <linux/htirq.h>
35 #ifdef CONFIG_ACPI
36 #include <acpi/acpi_bus.h>
37 #endif
38
39 #include <asm/io.h>
40 #include <asm/smp.h>
41 #include <asm/desc.h>
42 #include <asm/proto.h>
43 #include <asm/mach_apic.h>
44 #include <asm/acpi.h>
45 #include <asm/dma.h>
46 #include <asm/nmi.h>
47 #include <asm/msidef.h>
48 #include <asm/hypertransport.h>
49
50 struct irq_cfg {
51         cpumask_t domain;
52         u8 vector;
53 };
54
55 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
56 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
57         [0]  = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR,  },
58         [1]  = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR,  },
59         [2]  = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR,  },
60         [3]  = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR,  },
61         [4]  = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR,  },
62         [5]  = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR,  },
63         [6]  = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR,  },
64         [7]  = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR,  },
65         [8]  = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR,  },
66         [9]  = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR,  },
67         [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
68         [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
69         [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
70         [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
71         [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
72         [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
73 };
74
75 static int assign_irq_vector(int irq, cpumask_t mask);
76
77 #define __apicdebuginit  __init
78
79 int sis_apic_bug; /* not actually supported, dummy for compile */
80
81 static int no_timer_check;
82
83 static int disable_timer_pin_1 __initdata;
84
85 int timer_over_8254 __initdata = 1;
86
87 /* Where if anywhere is the i8259 connect in external int mode */
88 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
89
90 static DEFINE_SPINLOCK(ioapic_lock);
91 DEFINE_SPINLOCK(vector_lock);
92
93 /*
94  * # of IRQ routing registers
95  */
96 int nr_ioapic_registers[MAX_IO_APICS];
97
98 /*
99  * Rough estimation of how many shared IRQs there are, can
100  * be changed anytime.
101  */
102 #define MAX_PLUS_SHARED_IRQS NR_IRQS
103 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
104
105 /*
106  * This is performance-critical, we want to do it O(1)
107  *
108  * the indexing order of this array favors 1:1 mappings
109  * between pins and IRQs.
110  */
111
112 static struct irq_pin_list {
113         short apic, pin, next;
114 } irq_2_pin[PIN_MAP_SIZE];
115
116 struct io_apic {
117         unsigned int index;
118         unsigned int unused[3];
119         unsigned int data;
120 };
121
122 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
123 {
124         return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
125                 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
126 }
127
128 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
129 {
130         struct io_apic __iomem *io_apic = io_apic_base(apic);
131         writel(reg, &io_apic->index);
132         return readl(&io_apic->data);
133 }
134
135 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
136 {
137         struct io_apic __iomem *io_apic = io_apic_base(apic);
138         writel(reg, &io_apic->index);
139         writel(value, &io_apic->data);
140 }
141
142 /*
143  * Re-write a value: to be used for read-modify-write
144  * cycles where the read already set up the index register.
145  */
146 static inline void io_apic_modify(unsigned int apic, unsigned int value)
147 {
148         struct io_apic __iomem *io_apic = io_apic_base(apic);
149         writel(value, &io_apic->data);
150 }
151
152 /*
153  * Synchronize the IO-APIC and the CPU by doing
154  * a dummy read from the IO-APIC
155  */
156 static inline void io_apic_sync(unsigned int apic)
157 {
158         struct io_apic __iomem *io_apic = io_apic_base(apic);
159         readl(&io_apic->data);
160 }
161
162 #define __DO_ACTION(R, ACTION, FINAL)                                   \
163                                                                         \
164 {                                                                       \
165         int pin;                                                        \
166         struct irq_pin_list *entry = irq_2_pin + irq;                   \
167                                                                         \
168         BUG_ON(irq >= NR_IRQS);                                         \
169         for (;;) {                                                      \
170                 unsigned int reg;                                       \
171                 pin = entry->pin;                                       \
172                 if (pin == -1)                                          \
173                         break;                                          \
174                 reg = io_apic_read(entry->apic, 0x10 + R + pin*2);      \
175                 reg ACTION;                                             \
176                 io_apic_modify(entry->apic, reg);                       \
177                 FINAL;                                                  \
178                 if (!entry->next)                                       \
179                         break;                                          \
180                 entry = irq_2_pin + entry->next;                        \
181         }                                                               \
182 }
183
184 union entry_union {
185         struct { u32 w1, w2; };
186         struct IO_APIC_route_entry entry;
187 };
188
189 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
190 {
191         union entry_union eu;
192         unsigned long flags;
193         spin_lock_irqsave(&ioapic_lock, flags);
194         eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
195         eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
196         spin_unlock_irqrestore(&ioapic_lock, flags);
197         return eu.entry;
198 }
199
200 /*
201  * When we write a new IO APIC routing entry, we need to write the high
202  * word first! If the mask bit in the low word is clear, we will enable
203  * the interrupt, and we need to make sure the entry is fully populated
204  * before that happens.
205  */
206 static void
207 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
208 {
209         union entry_union eu;
210         eu.entry = e;
211         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
212         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
213 }
214
215 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
216 {
217         unsigned long flags;
218         spin_lock_irqsave(&ioapic_lock, flags);
219         __ioapic_write_entry(apic, pin, e);
220         spin_unlock_irqrestore(&ioapic_lock, flags);
221 }
222
223 /*
224  * When we mask an IO APIC routing entry, we need to write the low
225  * word first, in order to set the mask bit before we change the
226  * high bits!
227  */
228 static void ioapic_mask_entry(int apic, int pin)
229 {
230         unsigned long flags;
231         union entry_union eu = { .entry.mask = 1 };
232
233         spin_lock_irqsave(&ioapic_lock, flags);
234         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
235         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
236         spin_unlock_irqrestore(&ioapic_lock, flags);
237 }
238
239 #ifdef CONFIG_SMP
240 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
241 {
242         int apic, pin;
243         struct irq_pin_list *entry = irq_2_pin + irq;
244
245         BUG_ON(irq >= NR_IRQS);
246         for (;;) {
247                 unsigned int reg;
248                 apic = entry->apic;
249                 pin = entry->pin;
250                 if (pin == -1)
251                         break;
252                 io_apic_write(apic, 0x11 + pin*2, dest);
253                 reg = io_apic_read(apic, 0x10 + pin*2);
254                 reg &= ~0x000000ff;
255                 reg |= vector;
256                 io_apic_modify(apic, reg);
257                 if (!entry->next)
258                         break;
259                 entry = irq_2_pin + entry->next;
260         }
261 }
262
263 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
264 {
265         struct irq_cfg *cfg = irq_cfg + irq;
266         unsigned long flags;
267         unsigned int dest;
268         cpumask_t tmp;
269
270         cpus_and(tmp, mask, cpu_online_map);
271         if (cpus_empty(tmp))
272                 return;
273
274         if (assign_irq_vector(irq, mask))
275                 return;
276
277         cpus_and(tmp, cfg->domain, mask);
278         dest = cpu_mask_to_apicid(tmp);
279
280         /*
281          * Only the high 8 bits are valid.
282          */
283         dest = SET_APIC_LOGICAL_ID(dest);
284
285         spin_lock_irqsave(&ioapic_lock, flags);
286         __target_IO_APIC_irq(irq, dest, cfg->vector);
287         irq_desc[irq].affinity = mask;
288         spin_unlock_irqrestore(&ioapic_lock, flags);
289 }
290 #endif
291
292 /*
293  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
294  * shared ISA-space IRQs, so we have to support them. We are super
295  * fast in the common case, and fast for shared ISA-space IRQs.
296  */
297 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
298 {
299         static int first_free_entry = NR_IRQS;
300         struct irq_pin_list *entry = irq_2_pin + irq;
301
302         BUG_ON(irq >= NR_IRQS);
303         while (entry->next)
304                 entry = irq_2_pin + entry->next;
305
306         if (entry->pin != -1) {
307                 entry->next = first_free_entry;
308                 entry = irq_2_pin + entry->next;
309                 if (++first_free_entry >= PIN_MAP_SIZE)
310                         panic("io_apic.c: ran out of irq_2_pin entries!");
311         }
312         entry->apic = apic;
313         entry->pin = pin;
314 }
315
316
317 #define DO_ACTION(name,R,ACTION, FINAL)                                 \
318                                                                         \
319         static void name##_IO_APIC_irq (unsigned int irq)               \
320         __DO_ACTION(R, ACTION, FINAL)
321
322 DO_ACTION( __mask,             0, |= 0x00010000, io_apic_sync(entry->apic) )
323                                                 /* mask = 1 */
324 DO_ACTION( __unmask,           0, &= 0xfffeffff, )
325                                                 /* mask = 0 */
326
327 static void mask_IO_APIC_irq (unsigned int irq)
328 {
329         unsigned long flags;
330
331         spin_lock_irqsave(&ioapic_lock, flags);
332         __mask_IO_APIC_irq(irq);
333         spin_unlock_irqrestore(&ioapic_lock, flags);
334 }
335
336 static void unmask_IO_APIC_irq (unsigned int irq)
337 {
338         unsigned long flags;
339
340         spin_lock_irqsave(&ioapic_lock, flags);
341         __unmask_IO_APIC_irq(irq);
342         spin_unlock_irqrestore(&ioapic_lock, flags);
343 }
344
345 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
346 {
347         struct IO_APIC_route_entry entry;
348
349         /* Check delivery_mode to be sure we're not clearing an SMI pin */
350         entry = ioapic_read_entry(apic, pin);
351         if (entry.delivery_mode == dest_SMI)
352                 return;
353         /*
354          * Disable it in the IO-APIC irq-routing table:
355          */
356         ioapic_mask_entry(apic, pin);
357 }
358
359 static void clear_IO_APIC (void)
360 {
361         int apic, pin;
362
363         for (apic = 0; apic < nr_ioapics; apic++)
364                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
365                         clear_IO_APIC_pin(apic, pin);
366 }
367
368 int skip_ioapic_setup;
369 int ioapic_force;
370
371 /* dummy parsing: see setup.c */
372
373 static int __init disable_ioapic_setup(char *str)
374 {
375         skip_ioapic_setup = 1;
376         return 0;
377 }
378 early_param("noapic", disable_ioapic_setup);
379
380 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
381 static int __init disable_timer_pin_setup(char *arg)
382 {
383         disable_timer_pin_1 = 1;
384         return 1;
385 }
386 __setup("disable_timer_pin_1", disable_timer_pin_setup);
387
388 static int __init setup_disable_8254_timer(char *s)
389 {
390         timer_over_8254 = -1;
391         return 1;
392 }
393 static int __init setup_enable_8254_timer(char *s)
394 {
395         timer_over_8254 = 2;
396         return 1;
397 }
398
399 __setup("disable_8254_timer", setup_disable_8254_timer);
400 __setup("enable_8254_timer", setup_enable_8254_timer);
401
402
403 /*
404  * Find the IRQ entry number of a certain pin.
405  */
406 static int find_irq_entry(int apic, int pin, int type)
407 {
408         int i;
409
410         for (i = 0; i < mp_irq_entries; i++)
411                 if (mp_irqs[i].mpc_irqtype == type &&
412                     (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
413                      mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
414                     mp_irqs[i].mpc_dstirq == pin)
415                         return i;
416
417         return -1;
418 }
419
420 /*
421  * Find the pin to which IRQ[irq] (ISA) is connected
422  */
423 static int __init find_isa_irq_pin(int irq, int type)
424 {
425         int i;
426
427         for (i = 0; i < mp_irq_entries; i++) {
428                 int lbus = mp_irqs[i].mpc_srcbus;
429
430                 if (test_bit(lbus, mp_bus_not_pci) &&
431                     (mp_irqs[i].mpc_irqtype == type) &&
432                     (mp_irqs[i].mpc_srcbusirq == irq))
433
434                         return mp_irqs[i].mpc_dstirq;
435         }
436         return -1;
437 }
438
439 static int __init find_isa_irq_apic(int irq, int type)
440 {
441         int i;
442
443         for (i = 0; i < mp_irq_entries; i++) {
444                 int lbus = mp_irqs[i].mpc_srcbus;
445
446                 if (test_bit(lbus, mp_bus_not_pci) &&
447                     (mp_irqs[i].mpc_irqtype == type) &&
448                     (mp_irqs[i].mpc_srcbusirq == irq))
449                         break;
450         }
451         if (i < mp_irq_entries) {
452                 int apic;
453                 for(apic = 0; apic < nr_ioapics; apic++) {
454                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
455                                 return apic;
456                 }
457         }
458
459         return -1;
460 }
461
462 /*
463  * Find a specific PCI IRQ entry.
464  * Not an __init, possibly needed by modules
465  */
466 static int pin_2_irq(int idx, int apic, int pin);
467
468 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
469 {
470         int apic, i, best_guess = -1;
471
472         apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
473                 bus, slot, pin);
474         if (mp_bus_id_to_pci_bus[bus] == -1) {
475                 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
476                 return -1;
477         }
478         for (i = 0; i < mp_irq_entries; i++) {
479                 int lbus = mp_irqs[i].mpc_srcbus;
480
481                 for (apic = 0; apic < nr_ioapics; apic++)
482                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
483                             mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
484                                 break;
485
486                 if (!test_bit(lbus, mp_bus_not_pci) &&
487                     !mp_irqs[i].mpc_irqtype &&
488                     (bus == lbus) &&
489                     (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
490                         int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
491
492                         if (!(apic || IO_APIC_IRQ(irq)))
493                                 continue;
494
495                         if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
496                                 return irq;
497                         /*
498                          * Use the first all-but-pin matching entry as a
499                          * best-guess fuzzy result for broken mptables.
500                          */
501                         if (best_guess < 0)
502                                 best_guess = irq;
503                 }
504         }
505         BUG_ON(best_guess >= NR_IRQS);
506         return best_guess;
507 }
508
509 /* ISA interrupts are always polarity zero edge triggered,
510  * when listed as conforming in the MP table. */
511
512 #define default_ISA_trigger(idx)        (0)
513 #define default_ISA_polarity(idx)       (0)
514
515 /* PCI interrupts are always polarity one level triggered,
516  * when listed as conforming in the MP table. */
517
518 #define default_PCI_trigger(idx)        (1)
519 #define default_PCI_polarity(idx)       (1)
520
521 static int __init MPBIOS_polarity(int idx)
522 {
523         int bus = mp_irqs[idx].mpc_srcbus;
524         int polarity;
525
526         /*
527          * Determine IRQ line polarity (high active or low active):
528          */
529         switch (mp_irqs[idx].mpc_irqflag & 3)
530         {
531                 case 0: /* conforms, ie. bus-type dependent polarity */
532                         if (test_bit(bus, mp_bus_not_pci))
533                                 polarity = default_ISA_polarity(idx);
534                         else
535                                 polarity = default_PCI_polarity(idx);
536                         break;
537                 case 1: /* high active */
538                 {
539                         polarity = 0;
540                         break;
541                 }
542                 case 2: /* reserved */
543                 {
544                         printk(KERN_WARNING "broken BIOS!!\n");
545                         polarity = 1;
546                         break;
547                 }
548                 case 3: /* low active */
549                 {
550                         polarity = 1;
551                         break;
552                 }
553                 default: /* invalid */
554                 {
555                         printk(KERN_WARNING "broken BIOS!!\n");
556                         polarity = 1;
557                         break;
558                 }
559         }
560         return polarity;
561 }
562
563 static int MPBIOS_trigger(int idx)
564 {
565         int bus = mp_irqs[idx].mpc_srcbus;
566         int trigger;
567
568         /*
569          * Determine IRQ trigger mode (edge or level sensitive):
570          */
571         switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
572         {
573                 case 0: /* conforms, ie. bus-type dependent */
574                         if (test_bit(bus, mp_bus_not_pci))
575                                 trigger = default_ISA_trigger(idx);
576                         else
577                                 trigger = default_PCI_trigger(idx);
578                         break;
579                 case 1: /* edge */
580                 {
581                         trigger = 0;
582                         break;
583                 }
584                 case 2: /* reserved */
585                 {
586                         printk(KERN_WARNING "broken BIOS!!\n");
587                         trigger = 1;
588                         break;
589                 }
590                 case 3: /* level */
591                 {
592                         trigger = 1;
593                         break;
594                 }
595                 default: /* invalid */
596                 {
597                         printk(KERN_WARNING "broken BIOS!!\n");
598                         trigger = 0;
599                         break;
600                 }
601         }
602         return trigger;
603 }
604
605 static inline int irq_polarity(int idx)
606 {
607         return MPBIOS_polarity(idx);
608 }
609
610 static inline int irq_trigger(int idx)
611 {
612         return MPBIOS_trigger(idx);
613 }
614
615 static int pin_2_irq(int idx, int apic, int pin)
616 {
617         int irq, i;
618         int bus = mp_irqs[idx].mpc_srcbus;
619
620         /*
621          * Debugging check, we are in big trouble if this message pops up!
622          */
623         if (mp_irqs[idx].mpc_dstirq != pin)
624                 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
625
626         if (test_bit(bus, mp_bus_not_pci)) {
627                 irq = mp_irqs[idx].mpc_srcbusirq;
628         } else {
629                 /*
630                  * PCI IRQs are mapped in order
631                  */
632                 i = irq = 0;
633                 while (i < apic)
634                         irq += nr_ioapic_registers[i++];
635                 irq += pin;
636         }
637         BUG_ON(irq >= NR_IRQS);
638         return irq;
639 }
640
641 static int __assign_irq_vector(int irq, cpumask_t mask)
642 {
643         /*
644          * NOTE! The local APIC isn't very good at handling
645          * multiple interrupts at the same interrupt level.
646          * As the interrupt level is determined by taking the
647          * vector number and shifting that right by 4, we
648          * want to spread these out a bit so that they don't
649          * all fall in the same interrupt level.
650          *
651          * Also, we've got to be careful not to trash gate
652          * 0x80, because int 0x80 is hm, kind of importantish. ;)
653          */
654         static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
655         cpumask_t old_mask = CPU_MASK_NONE;
656         unsigned int old_vector;
657         int cpu;
658         struct irq_cfg *cfg;
659
660         BUG_ON((unsigned)irq >= NR_IRQS);
661         cfg = &irq_cfg[irq];
662
663         /* Only try and allocate irqs on cpus that are present */
664         cpus_and(mask, mask, cpu_online_map);
665
666         old_vector = cfg->vector;
667         if (old_vector) {
668                 cpumask_t tmp;
669                 cpus_and(tmp, cfg->domain, mask);
670                 if (!cpus_empty(tmp))
671                         return 0;
672                 cpus_and(old_mask, cfg->domain, cpu_online_map);
673         }
674
675         for_each_cpu_mask(cpu, mask) {
676                 cpumask_t domain, new_mask;
677                 int new_cpu, old_cpu;
678                 int vector, offset;
679
680                 domain = vector_allocation_domain(cpu);
681                 cpus_and(new_mask, domain, cpu_online_map);
682
683                 vector = current_vector;
684                 offset = current_offset;
685 next:
686                 vector += 8;
687                 if (vector >= FIRST_SYSTEM_VECTOR) {
688                         /* If we run out of vectors on large boxen, must share them. */
689                         offset = (offset + 1) % 8;
690                         vector = FIRST_DEVICE_VECTOR + offset;
691                 }
692                 if (unlikely(current_vector == vector))
693                         continue;
694                 if (vector == IA32_SYSCALL_VECTOR)
695                         goto next;
696                 for_each_cpu_mask(new_cpu, new_mask)
697                         if (per_cpu(vector_irq, new_cpu)[vector] != -1)
698                                 goto next;
699                 /* Found one! */
700                 current_vector = vector;
701                 current_offset = offset;
702                 for_each_cpu_mask(old_cpu, old_mask)
703                         per_cpu(vector_irq, old_cpu)[old_vector] = -1;
704                 for_each_cpu_mask(new_cpu, new_mask)
705                         per_cpu(vector_irq, new_cpu)[vector] = irq;
706                 cfg->vector = vector;
707                 cfg->domain = domain;
708                 return 0;
709         }
710         return -ENOSPC;
711 }
712
713 static int assign_irq_vector(int irq, cpumask_t mask)
714 {
715         int err;
716         unsigned long flags;
717
718         spin_lock_irqsave(&vector_lock, flags);
719         err = __assign_irq_vector(irq, mask);
720         spin_unlock_irqrestore(&vector_lock, flags);
721         return err;
722 }
723
724 static void __clear_irq_vector(int irq)
725 {
726         struct irq_cfg *cfg;
727         cpumask_t mask;
728         int cpu, vector;
729
730         BUG_ON((unsigned)irq >= NR_IRQS);
731         cfg = &irq_cfg[irq];
732         BUG_ON(!cfg->vector);
733
734         vector = cfg->vector;
735         cpus_and(mask, cfg->domain, cpu_online_map);
736         for_each_cpu_mask(cpu, mask)
737                 per_cpu(vector_irq, cpu)[vector] = -1;
738
739         cfg->vector = 0;
740         cfg->domain = CPU_MASK_NONE;
741 }
742
743 void __setup_vector_irq(int cpu)
744 {
745         /* Initialize vector_irq on a new cpu */
746         /* This function must be called with vector_lock held */
747         int irq, vector;
748
749         /* Mark the inuse vectors */
750         for (irq = 0; irq < NR_IRQS; ++irq) {
751                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
752                         continue;
753                 vector = irq_cfg[irq].vector;
754                 per_cpu(vector_irq, cpu)[vector] = irq;
755         }
756         /* Mark the free vectors */
757         for (vector = 0; vector < NR_VECTORS; ++vector) {
758                 irq = per_cpu(vector_irq, cpu)[vector];
759                 if (irq < 0)
760                         continue;
761                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
762                         per_cpu(vector_irq, cpu)[vector] = -1;
763         }
764 }
765
766
767 static struct irq_chip ioapic_chip;
768
769 static void ioapic_register_intr(int irq, unsigned long trigger)
770 {
771         if (trigger)
772                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
773                                               handle_fasteoi_irq, "fasteoi");
774         else
775                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
776                                               handle_edge_irq, "edge");
777 }
778
779 static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
780                               int trigger, int polarity)
781 {
782         struct irq_cfg *cfg = irq_cfg + irq;
783         struct IO_APIC_route_entry entry;
784         cpumask_t mask;
785         unsigned long flags;
786
787         if (!IO_APIC_IRQ(irq))
788                 return;
789
790         mask = TARGET_CPUS;
791         if (assign_irq_vector(irq, mask))
792                 return;
793
794         cpus_and(mask, cfg->domain, mask);
795
796         apic_printk(APIC_VERBOSE,KERN_DEBUG
797                     "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
798                     "IRQ %d Mode:%i Active:%i)\n",
799                     apic, mp_ioapics[apic].mpc_apicid, pin, cfg->vector,
800                     irq, trigger, polarity);
801
802         /*
803          * add it to the IO-APIC irq-routing table:
804          */
805         memset(&entry,0,sizeof(entry));
806
807         entry.delivery_mode = INT_DELIVERY_MODE;
808         entry.dest_mode = INT_DEST_MODE;
809         entry.dest = cpu_mask_to_apicid(mask);
810         entry.mask = 0;                         /* enable IRQ */
811         entry.trigger = trigger;
812         entry.polarity = polarity;
813         entry.vector = cfg->vector;
814
815         /* Mask level triggered irqs.
816          * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
817          */
818         if (trigger)
819                 entry.mask = 1;
820
821         ioapic_register_intr(irq, trigger);
822         if (irq < 16)
823                 disable_8259A_irq(irq);
824
825         ioapic_write_entry(apic, pin, entry);
826
827         spin_lock_irqsave(&ioapic_lock, flags);
828         irq_desc[irq].affinity = TARGET_CPUS;
829         spin_unlock_irqrestore(&ioapic_lock, flags);
830 }
831
832 static void __init setup_IO_APIC_irqs(void)
833 {
834         int apic, pin, idx, irq, first_notcon = 1;
835
836         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
837
838         for (apic = 0; apic < nr_ioapics; apic++) {
839         for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
840
841                 idx = find_irq_entry(apic,pin,mp_INT);
842                 if (idx == -1) {
843                         if (first_notcon) {
844                                 apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
845                                 first_notcon = 0;
846                         } else
847                                 apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
848                         continue;
849                 }
850
851                 irq = pin_2_irq(idx, apic, pin);
852                 add_pin_to_irq(irq, apic, pin);
853
854                 setup_IO_APIC_irq(apic, pin, irq,
855                                   irq_trigger(idx), irq_polarity(idx));
856         }
857         }
858
859         if (!first_notcon)
860                 apic_printk(APIC_VERBOSE," not connected.\n");
861 }
862
863 /*
864  * Set up the 8259A-master output pin as broadcast to all
865  * CPUs.
866  */
867 static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
868 {
869         struct IO_APIC_route_entry entry;
870         unsigned long flags;
871
872         memset(&entry,0,sizeof(entry));
873
874         disable_8259A_irq(0);
875
876         /* mask LVT0 */
877         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
878
879         /*
880          * We use logical delivery to get the timer IRQ
881          * to the first CPU.
882          */
883         entry.dest_mode = INT_DEST_MODE;
884         entry.mask = 0;                                 /* unmask IRQ now */
885         entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
886         entry.delivery_mode = INT_DELIVERY_MODE;
887         entry.polarity = 0;
888         entry.trigger = 0;
889         entry.vector = vector;
890
891         /*
892          * The timer IRQ doesn't have to know that behind the
893          * scene we have a 8259A-master in AEOI mode ...
894          */
895         set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
896
897         /*
898          * Add it to the IO-APIC irq-routing table:
899          */
900         spin_lock_irqsave(&ioapic_lock, flags);
901         io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
902         io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
903         spin_unlock_irqrestore(&ioapic_lock, flags);
904
905         enable_8259A_irq(0);
906 }
907
908 void __init UNEXPECTED_IO_APIC(void)
909 {
910 }
911
912 void __apicdebuginit print_IO_APIC(void)
913 {
914         int apic, i;
915         union IO_APIC_reg_00 reg_00;
916         union IO_APIC_reg_01 reg_01;
917         union IO_APIC_reg_02 reg_02;
918         unsigned long flags;
919
920         if (apic_verbosity == APIC_QUIET)
921                 return;
922
923         printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
924         for (i = 0; i < nr_ioapics; i++)
925                 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
926                        mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
927
928         /*
929          * We are a bit conservative about what we expect.  We have to
930          * know about every hardware change ASAP.
931          */
932         printk(KERN_INFO "testing the IO APIC.......................\n");
933
934         for (apic = 0; apic < nr_ioapics; apic++) {
935
936         spin_lock_irqsave(&ioapic_lock, flags);
937         reg_00.raw = io_apic_read(apic, 0);
938         reg_01.raw = io_apic_read(apic, 1);
939         if (reg_01.bits.version >= 0x10)
940                 reg_02.raw = io_apic_read(apic, 2);
941         spin_unlock_irqrestore(&ioapic_lock, flags);
942
943         printk("\n");
944         printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
945         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
946         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
947         if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
948                 UNEXPECTED_IO_APIC();
949
950         printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
951         printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);
952         if (    (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
953                 (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
954                 (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
955                 (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
956                 (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
957                 (reg_01.bits.entries != 0x2E) &&
958                 (reg_01.bits.entries != 0x3F) &&
959                 (reg_01.bits.entries != 0x03) 
960         )
961                 UNEXPECTED_IO_APIC();
962
963         printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
964         printk(KERN_DEBUG ".......     : IO APIC version: %04X\n", reg_01.bits.version);
965         if (    (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
966                 (reg_01.bits.version != 0x02) && /* 82801BA IO-APICs (ICH2) */
967                 (reg_01.bits.version != 0x10) && /* oldest IO-APICs */
968                 (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
969                 (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
970                 (reg_01.bits.version != 0x20)    /* Intel P64H (82806 AA) */
971         )
972                 UNEXPECTED_IO_APIC();
973         if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
974                 UNEXPECTED_IO_APIC();
975
976         if (reg_01.bits.version >= 0x10) {
977                 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
978                 printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
979                 if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
980                         UNEXPECTED_IO_APIC();
981         }
982
983         printk(KERN_DEBUG ".... IRQ redirection table:\n");
984
985         printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
986                           " Stat Dmod Deli Vect:   \n");
987
988         for (i = 0; i <= reg_01.bits.entries; i++) {
989                 struct IO_APIC_route_entry entry;
990
991                 entry = ioapic_read_entry(apic, i);
992
993                 printk(KERN_DEBUG " %02x %03X ",
994                         i,
995                         entry.dest
996                 );
997
998                 printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
999                         entry.mask,
1000                         entry.trigger,
1001                         entry.irr,
1002                         entry.polarity,
1003                         entry.delivery_status,
1004                         entry.dest_mode,
1005                         entry.delivery_mode,
1006                         entry.vector
1007                 );
1008         }
1009         }
1010         printk(KERN_DEBUG "IRQ to pin mappings:\n");
1011         for (i = 0; i < NR_IRQS; i++) {
1012                 struct irq_pin_list *entry = irq_2_pin + i;
1013                 if (entry->pin < 0)
1014                         continue;
1015                 printk(KERN_DEBUG "IRQ%d ", i);
1016                 for (;;) {
1017                         printk("-> %d:%d", entry->apic, entry->pin);
1018                         if (!entry->next)
1019                                 break;
1020                         entry = irq_2_pin + entry->next;
1021                 }
1022                 printk("\n");
1023         }
1024
1025         printk(KERN_INFO ".................................... done.\n");
1026
1027         return;
1028 }
1029
1030 #if 0
1031
1032 static __apicdebuginit void print_APIC_bitfield (int base)
1033 {
1034         unsigned int v;
1035         int i, j;
1036
1037         if (apic_verbosity == APIC_QUIET)
1038                 return;
1039
1040         printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1041         for (i = 0; i < 8; i++) {
1042                 v = apic_read(base + i*0x10);
1043                 for (j = 0; j < 32; j++) {
1044                         if (v & (1<<j))
1045                                 printk("1");
1046                         else
1047                                 printk("0");
1048                 }
1049                 printk("\n");
1050         }
1051 }
1052
1053 void __apicdebuginit print_local_APIC(void * dummy)
1054 {
1055         unsigned int v, ver, maxlvt;
1056
1057         if (apic_verbosity == APIC_QUIET)
1058                 return;
1059
1060         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1061                 smp_processor_id(), hard_smp_processor_id());
1062         v = apic_read(APIC_ID);
1063         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(v));
1064         v = apic_read(APIC_LVR);
1065         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1066         ver = GET_APIC_VERSION(v);
1067         maxlvt = get_maxlvt();
1068
1069         v = apic_read(APIC_TASKPRI);
1070         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1071
1072         v = apic_read(APIC_ARBPRI);
1073         printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1074                 v & APIC_ARBPRI_MASK);
1075         v = apic_read(APIC_PROCPRI);
1076         printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1077
1078         v = apic_read(APIC_EOI);
1079         printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1080         v = apic_read(APIC_RRR);
1081         printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1082         v = apic_read(APIC_LDR);
1083         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1084         v = apic_read(APIC_DFR);
1085         printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1086         v = apic_read(APIC_SPIV);
1087         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1088
1089         printk(KERN_DEBUG "... APIC ISR field:\n");
1090         print_APIC_bitfield(APIC_ISR);
1091         printk(KERN_DEBUG "... APIC TMR field:\n");
1092         print_APIC_bitfield(APIC_TMR);
1093         printk(KERN_DEBUG "... APIC IRR field:\n");
1094         print_APIC_bitfield(APIC_IRR);
1095
1096         v = apic_read(APIC_ESR);
1097         printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1098
1099         v = apic_read(APIC_ICR);
1100         printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1101         v = apic_read(APIC_ICR2);
1102         printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1103
1104         v = apic_read(APIC_LVTT);
1105         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1106
1107         if (maxlvt > 3) {                       /* PC is LVT#4. */
1108                 v = apic_read(APIC_LVTPC);
1109                 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1110         }
1111         v = apic_read(APIC_LVT0);
1112         printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1113         v = apic_read(APIC_LVT1);
1114         printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1115
1116         if (maxlvt > 2) {                       /* ERR is LVT#3. */
1117                 v = apic_read(APIC_LVTERR);
1118                 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1119         }
1120
1121         v = apic_read(APIC_TMICT);
1122         printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1123         v = apic_read(APIC_TMCCT);
1124         printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1125         v = apic_read(APIC_TDCR);
1126         printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1127         printk("\n");
1128 }
1129
1130 void print_all_local_APICs (void)
1131 {
1132         on_each_cpu(print_local_APIC, NULL, 1, 1);
1133 }
1134
1135 void __apicdebuginit print_PIC(void)
1136 {
1137         unsigned int v;
1138         unsigned long flags;
1139
1140         if (apic_verbosity == APIC_QUIET)
1141                 return;
1142
1143         printk(KERN_DEBUG "\nprinting PIC contents\n");
1144
1145         spin_lock_irqsave(&i8259A_lock, flags);
1146
1147         v = inb(0xa1) << 8 | inb(0x21);
1148         printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
1149
1150         v = inb(0xa0) << 8 | inb(0x20);
1151         printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
1152
1153         outb(0x0b,0xa0);
1154         outb(0x0b,0x20);
1155         v = inb(0xa0) << 8 | inb(0x20);
1156         outb(0x0a,0xa0);
1157         outb(0x0a,0x20);
1158
1159         spin_unlock_irqrestore(&i8259A_lock, flags);
1160
1161         printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
1162
1163         v = inb(0x4d1) << 8 | inb(0x4d0);
1164         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1165 }
1166
1167 #endif  /*  0  */
1168
1169 static void __init enable_IO_APIC(void)
1170 {
1171         union IO_APIC_reg_01 reg_01;
1172         int i8259_apic, i8259_pin;
1173         int i, apic;
1174         unsigned long flags;
1175
1176         for (i = 0; i < PIN_MAP_SIZE; i++) {
1177                 irq_2_pin[i].pin = -1;
1178                 irq_2_pin[i].next = 0;
1179         }
1180
1181         /*
1182          * The number of IO-APIC IRQ registers (== #pins):
1183          */
1184         for (apic = 0; apic < nr_ioapics; apic++) {
1185                 spin_lock_irqsave(&ioapic_lock, flags);
1186                 reg_01.raw = io_apic_read(apic, 1);
1187                 spin_unlock_irqrestore(&ioapic_lock, flags);
1188                 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1189         }
1190         for(apic = 0; apic < nr_ioapics; apic++) {
1191                 int pin;
1192                 /* See if any of the pins is in ExtINT mode */
1193                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1194                         struct IO_APIC_route_entry entry;
1195                         entry = ioapic_read_entry(apic, pin);
1196
1197                         /* If the interrupt line is enabled and in ExtInt mode
1198                          * I have found the pin where the i8259 is connected.
1199                          */
1200                         if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1201                                 ioapic_i8259.apic = apic;
1202                                 ioapic_i8259.pin  = pin;
1203                                 goto found_i8259;
1204                         }
1205                 }
1206         }
1207  found_i8259:
1208         /* Look to see what if the MP table has reported the ExtINT */
1209         i8259_pin  = find_isa_irq_pin(0, mp_ExtINT);
1210         i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1211         /* Trust the MP table if nothing is setup in the hardware */
1212         if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1213                 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1214                 ioapic_i8259.pin  = i8259_pin;
1215                 ioapic_i8259.apic = i8259_apic;
1216         }
1217         /* Complain if the MP table and the hardware disagree */
1218         if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1219                 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1220         {
1221                 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1222         }
1223
1224         /*
1225          * Do not trust the IO-APIC being empty at bootup
1226          */
1227         clear_IO_APIC();
1228 }
1229
1230 /*
1231  * Not an __init, needed by the reboot code
1232  */
1233 void disable_IO_APIC(void)
1234 {
1235         /*
1236          * Clear the IO-APIC before rebooting:
1237          */
1238         clear_IO_APIC();
1239
1240         /*
1241          * If the i8259 is routed through an IOAPIC
1242          * Put that IOAPIC in virtual wire mode
1243          * so legacy interrupts can be delivered.
1244          */
1245         if (ioapic_i8259.pin != -1) {
1246                 struct IO_APIC_route_entry entry;
1247
1248                 memset(&entry, 0, sizeof(entry));
1249                 entry.mask            = 0; /* Enabled */
1250                 entry.trigger         = 0; /* Edge */
1251                 entry.irr             = 0;
1252                 entry.polarity        = 0; /* High */
1253                 entry.delivery_status = 0;
1254                 entry.dest_mode       = 0; /* Physical */
1255                 entry.delivery_mode   = dest_ExtINT; /* ExtInt */
1256                 entry.vector          = 0;
1257                 entry.dest          = GET_APIC_ID(apic_read(APIC_ID));
1258
1259                 /*
1260                  * Add it to the IO-APIC irq-routing table:
1261                  */
1262                 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1263         }
1264
1265         disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1266 }
1267
1268 /*
1269  * There is a nasty bug in some older SMP boards, their mptable lies
1270  * about the timer IRQ. We do the following to work around the situation:
1271  *
1272  *      - timer IRQ defaults to IO-APIC IRQ
1273  *      - if this function detects that timer IRQs are defunct, then we fall
1274  *        back to ISA timer IRQs
1275  */
1276 static int __init timer_irq_works(void)
1277 {
1278         unsigned long t1 = jiffies;
1279
1280         local_irq_enable();
1281         /* Let ten ticks pass... */
1282         mdelay((10 * 1000) / HZ);
1283
1284         /*
1285          * Expect a few ticks at least, to be sure some possible
1286          * glue logic does not lock up after one or two first
1287          * ticks in a non-ExtINT mode.  Also the local APIC
1288          * might have cached one ExtINT interrupt.  Finally, at
1289          * least one tick may be lost due to delays.
1290          */
1291
1292         /* jiffies wrap? */
1293         if (jiffies - t1 > 4)
1294                 return 1;
1295         return 0;
1296 }
1297
1298 /*
1299  * In the SMP+IOAPIC case it might happen that there are an unspecified
1300  * number of pending IRQ events unhandled. These cases are very rare,
1301  * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1302  * better to do it this way as thus we do not have to be aware of
1303  * 'pending' interrupts in the IRQ path, except at this point.
1304  */
1305 /*
1306  * Edge triggered needs to resend any interrupt
1307  * that was delayed but this is now handled in the device
1308  * independent code.
1309  */
1310
1311 /*
1312  * Starting up a edge-triggered IO-APIC interrupt is
1313  * nasty - we need to make sure that we get the edge.
1314  * If it is already asserted for some reason, we need
1315  * return 1 to indicate that is was pending.
1316  *
1317  * This is not complete - we should be able to fake
1318  * an edge even if it isn't on the 8259A...
1319  */
1320
1321 static unsigned int startup_ioapic_irq(unsigned int irq)
1322 {
1323         int was_pending = 0;
1324         unsigned long flags;
1325
1326         spin_lock_irqsave(&ioapic_lock, flags);
1327         if (irq < 16) {
1328                 disable_8259A_irq(irq);
1329                 if (i8259A_irq_pending(irq))
1330                         was_pending = 1;
1331         }
1332         __unmask_IO_APIC_irq(irq);
1333         spin_unlock_irqrestore(&ioapic_lock, flags);
1334
1335         return was_pending;
1336 }
1337
1338 static int ioapic_retrigger_irq(unsigned int irq)
1339 {
1340         struct irq_cfg *cfg = &irq_cfg[irq];
1341         cpumask_t mask;
1342         unsigned long flags;
1343
1344         spin_lock_irqsave(&vector_lock, flags);
1345         cpus_clear(mask);
1346         cpu_set(first_cpu(cfg->domain), mask);
1347
1348         send_IPI_mask(mask, cfg->vector);
1349         spin_unlock_irqrestore(&vector_lock, flags);
1350
1351         return 1;
1352 }
1353
1354 /*
1355  * Level and edge triggered IO-APIC interrupts need different handling,
1356  * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1357  * handled with the level-triggered descriptor, but that one has slightly
1358  * more overhead. Level-triggered interrupts cannot be handled with the
1359  * edge-triggered handler, without risking IRQ storms and other ugly
1360  * races.
1361  */
1362
1363 static void ack_apic_edge(unsigned int irq)
1364 {
1365         move_native_irq(irq);
1366         ack_APIC_irq();
1367 }
1368
1369 static void ack_apic_level(unsigned int irq)
1370 {
1371         int do_unmask_irq = 0;
1372
1373 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
1374         /* If we are moving the irq we need to mask it */
1375         if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
1376                 do_unmask_irq = 1;
1377                 mask_IO_APIC_irq(irq);
1378         }
1379 #endif
1380
1381         /*
1382          * We must acknowledge the irq before we move it or the acknowledge will
1383          * not propogate properly.
1384          */
1385         ack_APIC_irq();
1386
1387         /* Now we can move and renable the irq */
1388         move_masked_irq(irq);
1389         if (unlikely(do_unmask_irq))
1390                 unmask_IO_APIC_irq(irq);
1391 }
1392
1393 static struct irq_chip ioapic_chip __read_mostly = {
1394         .name           = "IO-APIC",
1395         .startup        = startup_ioapic_irq,
1396         .mask           = mask_IO_APIC_irq,
1397         .unmask         = unmask_IO_APIC_irq,
1398         .ack            = ack_apic_edge,
1399         .eoi            = ack_apic_level,
1400 #ifdef CONFIG_SMP
1401         .set_affinity   = set_ioapic_affinity_irq,
1402 #endif
1403         .retrigger      = ioapic_retrigger_irq,
1404 };
1405
1406 static inline void init_IO_APIC_traps(void)
1407 {
1408         int irq;
1409
1410         /*
1411          * NOTE! The local APIC isn't very good at handling
1412          * multiple interrupts at the same interrupt level.
1413          * As the interrupt level is determined by taking the
1414          * vector number and shifting that right by 4, we
1415          * want to spread these out a bit so that they don't
1416          * all fall in the same interrupt level.
1417          *
1418          * Also, we've got to be careful not to trash gate
1419          * 0x80, because int 0x80 is hm, kind of importantish. ;)
1420          */
1421         for (irq = 0; irq < NR_IRQS ; irq++) {
1422                 int tmp = irq;
1423                 if (IO_APIC_IRQ(tmp) && !irq_cfg[tmp].vector) {
1424                         /*
1425                          * Hmm.. We don't have an entry for this,
1426                          * so default to an old-fashioned 8259
1427                          * interrupt if we can..
1428                          */
1429                         if (irq < 16)
1430                                 make_8259A_irq(irq);
1431                         else
1432                                 /* Strange. Oh, well.. */
1433                                 irq_desc[irq].chip = &no_irq_chip;
1434                 }
1435         }
1436 }
1437
1438 static void enable_lapic_irq (unsigned int irq)
1439 {
1440         unsigned long v;
1441
1442         v = apic_read(APIC_LVT0);
1443         apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1444 }
1445
1446 static void disable_lapic_irq (unsigned int irq)
1447 {
1448         unsigned long v;
1449
1450         v = apic_read(APIC_LVT0);
1451         apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1452 }
1453
1454 static void ack_lapic_irq (unsigned int irq)
1455 {
1456         ack_APIC_irq();
1457 }
1458
1459 static void end_lapic_irq (unsigned int i) { /* nothing */ }
1460
1461 static struct hw_interrupt_type lapic_irq_type __read_mostly = {
1462         .typename = "local-APIC-edge",
1463         .startup = NULL, /* startup_irq() not used for IRQ0 */
1464         .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
1465         .enable = enable_lapic_irq,
1466         .disable = disable_lapic_irq,
1467         .ack = ack_lapic_irq,
1468         .end = end_lapic_irq,
1469 };
1470
1471 static void setup_nmi (void)
1472 {
1473         /*
1474          * Dirty trick to enable the NMI watchdog ...
1475          * We put the 8259A master into AEOI mode and
1476          * unmask on all local APICs LVT0 as NMI.
1477          *
1478          * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1479          * is from Maciej W. Rozycki - so we do not have to EOI from
1480          * the NMI handler or the timer interrupt.
1481          */ 
1482         printk(KERN_INFO "activating NMI Watchdog ...");
1483
1484         enable_NMI_through_LVT0(NULL);
1485
1486         printk(" done.\n");
1487 }
1488
1489 /*
1490  * This looks a bit hackish but it's about the only one way of sending
1491  * a few INTA cycles to 8259As and any associated glue logic.  ICR does
1492  * not support the ExtINT mode, unfortunately.  We need to send these
1493  * cycles as some i82489DX-based boards have glue logic that keeps the
1494  * 8259A interrupt line asserted until INTA.  --macro
1495  */
1496 static inline void unlock_ExtINT_logic(void)
1497 {
1498         int apic, pin, i;
1499         struct IO_APIC_route_entry entry0, entry1;
1500         unsigned char save_control, save_freq_select;
1501         unsigned long flags;
1502
1503         pin  = find_isa_irq_pin(8, mp_INT);
1504         apic = find_isa_irq_apic(8, mp_INT);
1505         if (pin == -1)
1506                 return;
1507
1508         spin_lock_irqsave(&ioapic_lock, flags);
1509         *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
1510         *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
1511         spin_unlock_irqrestore(&ioapic_lock, flags);
1512         clear_IO_APIC_pin(apic, pin);
1513
1514         memset(&entry1, 0, sizeof(entry1));
1515
1516         entry1.dest_mode = 0;                   /* physical delivery */
1517         entry1.mask = 0;                        /* unmask IRQ now */
1518         entry1.dest = hard_smp_processor_id();
1519         entry1.delivery_mode = dest_ExtINT;
1520         entry1.polarity = entry0.polarity;
1521         entry1.trigger = 0;
1522         entry1.vector = 0;
1523
1524         spin_lock_irqsave(&ioapic_lock, flags);
1525         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
1526         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
1527         spin_unlock_irqrestore(&ioapic_lock, flags);
1528
1529         save_control = CMOS_READ(RTC_CONTROL);
1530         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1531         CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
1532                    RTC_FREQ_SELECT);
1533         CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
1534
1535         i = 100;
1536         while (i-- > 0) {
1537                 mdelay(10);
1538                 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
1539                         i -= 10;
1540         }
1541
1542         CMOS_WRITE(save_control, RTC_CONTROL);
1543         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1544         clear_IO_APIC_pin(apic, pin);
1545
1546         spin_lock_irqsave(&ioapic_lock, flags);
1547         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
1548         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
1549         spin_unlock_irqrestore(&ioapic_lock, flags);
1550 }
1551
1552 /*
1553  * This code may look a bit paranoid, but it's supposed to cooperate with
1554  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
1555  * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
1556  * fanatically on his truly buggy board.
1557  *
1558  * FIXME: really need to revamp this for modern platforms only.
1559  */
1560 static inline void check_timer(void)
1561 {
1562         struct irq_cfg *cfg = irq_cfg + 0;
1563         int apic1, pin1, apic2, pin2;
1564
1565         /*
1566          * get/set the timer IRQ vector:
1567          */
1568         disable_8259A_irq(0);
1569         assign_irq_vector(0, TARGET_CPUS);
1570
1571         /*
1572          * Subtle, code in do_timer_interrupt() expects an AEOI
1573          * mode for the 8259A whenever interrupts are routed
1574          * through I/O APICs.  Also IRQ0 has to be enabled in
1575          * the 8259A which implies the virtual wire has to be
1576          * disabled in the local APIC.
1577          */
1578         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1579         init_8259A(1);
1580         if (timer_over_8254 > 0)
1581                 enable_8259A_irq(0);
1582
1583         pin1  = find_isa_irq_pin(0, mp_INT);
1584         apic1 = find_isa_irq_apic(0, mp_INT);
1585         pin2  = ioapic_i8259.pin;
1586         apic2 = ioapic_i8259.apic;
1587
1588         apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
1589                 cfg->vector, apic1, pin1, apic2, pin2);
1590
1591         if (pin1 != -1) {
1592                 /*
1593                  * Ok, does IRQ0 through the IOAPIC work?
1594                  */
1595                 unmask_IO_APIC_irq(0);
1596                 if (!no_timer_check && timer_irq_works()) {
1597                         nmi_watchdog_default();
1598                         if (nmi_watchdog == NMI_IO_APIC) {
1599                                 disable_8259A_irq(0);
1600                                 setup_nmi();
1601                                 enable_8259A_irq(0);
1602                         }
1603                         if (disable_timer_pin_1 > 0)
1604                                 clear_IO_APIC_pin(0, pin1);
1605                         return;
1606                 }
1607                 clear_IO_APIC_pin(apic1, pin1);
1608                 apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
1609                                 "connected to IO-APIC\n");
1610         }
1611
1612         apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
1613                                 "through the 8259A ... ");
1614         if (pin2 != -1) {
1615                 apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
1616                         apic2, pin2);
1617                 /*
1618                  * legacy devices should be connected to IO APIC #0
1619                  */
1620                 setup_ExtINT_IRQ0_pin(apic2, pin2, cfg->vector);
1621                 if (timer_irq_works()) {
1622                         apic_printk(APIC_VERBOSE," works.\n");
1623                         nmi_watchdog_default();
1624                         if (nmi_watchdog == NMI_IO_APIC) {
1625                                 setup_nmi();
1626                         }
1627                         return;
1628                 }
1629                 /*
1630                  * Cleanup, just in case ...
1631                  */
1632                 clear_IO_APIC_pin(apic2, pin2);
1633         }
1634         apic_printk(APIC_VERBOSE," failed.\n");
1635
1636         if (nmi_watchdog == NMI_IO_APIC) {
1637                 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1638                 nmi_watchdog = 0;
1639         }
1640
1641         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
1642
1643         disable_8259A_irq(0);
1644         irq_desc[0].chip = &lapic_irq_type;
1645         apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector);     /* Fixed mode */
1646         enable_8259A_irq(0);
1647
1648         if (timer_irq_works()) {
1649                 apic_printk(APIC_VERBOSE," works.\n");
1650                 return;
1651         }
1652         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
1653         apic_printk(APIC_VERBOSE," failed.\n");
1654
1655         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
1656
1657         init_8259A(0);
1658         make_8259A_irq(0);
1659         apic_write(APIC_LVT0, APIC_DM_EXTINT);
1660
1661         unlock_ExtINT_logic();
1662
1663         if (timer_irq_works()) {
1664                 apic_printk(APIC_VERBOSE," works.\n");
1665                 return;
1666         }
1667         apic_printk(APIC_VERBOSE," failed :(.\n");
1668         panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1669 }
1670
1671 static int __init notimercheck(char *s)
1672 {
1673         no_timer_check = 1;
1674         return 1;
1675 }
1676 __setup("no_timer_check", notimercheck);
1677
1678 /*
1679  *
1680  * IRQ's that are handled by the PIC in the MPS IOAPIC case.
1681  * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1682  *   Linux doesn't really care, as it's not actually used
1683  *   for any interrupt handling anyway.
1684  */
1685 #define PIC_IRQS        (1<<2)
1686
1687 void __init setup_IO_APIC(void)
1688 {
1689         enable_IO_APIC();
1690
1691         if (acpi_ioapic)
1692                 io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
1693         else
1694                 io_apic_irqs = ~PIC_IRQS;
1695
1696         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
1697
1698         sync_Arb_IDs();
1699         setup_IO_APIC_irqs();
1700         init_IO_APIC_traps();
1701         check_timer();
1702         if (!acpi_ioapic)
1703                 print_IO_APIC();
1704 }
1705
1706 struct sysfs_ioapic_data {
1707         struct sys_device dev;
1708         struct IO_APIC_route_entry entry[0];
1709 };
1710 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
1711
1712 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
1713 {
1714         struct IO_APIC_route_entry *entry;
1715         struct sysfs_ioapic_data *data;
1716         int i;
1717
1718         data = container_of(dev, struct sysfs_ioapic_data, dev);
1719         entry = data->entry;
1720         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
1721                 *entry = ioapic_read_entry(dev->id, i);
1722
1723         return 0;
1724 }
1725
1726 static int ioapic_resume(struct sys_device *dev)
1727 {
1728         struct IO_APIC_route_entry *entry;
1729         struct sysfs_ioapic_data *data;
1730         unsigned long flags;
1731         union IO_APIC_reg_00 reg_00;
1732         int i;
1733
1734         data = container_of(dev, struct sysfs_ioapic_data, dev);
1735         entry = data->entry;
1736
1737         spin_lock_irqsave(&ioapic_lock, flags);
1738         reg_00.raw = io_apic_read(dev->id, 0);
1739         if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
1740                 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
1741                 io_apic_write(dev->id, 0, reg_00.raw);
1742         }
1743         spin_unlock_irqrestore(&ioapic_lock, flags);
1744         for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
1745                 ioapic_write_entry(dev->id, i, entry[i]);
1746
1747         return 0;
1748 }
1749
1750 static struct sysdev_class ioapic_sysdev_class = {
1751         set_kset_name("ioapic"),
1752         .suspend = ioapic_suspend,
1753         .resume = ioapic_resume,
1754 };
1755
1756 static int __init ioapic_init_sysfs(void)
1757 {
1758         struct sys_device * dev;
1759         int i, size, error = 0;
1760
1761         error = sysdev_class_register(&ioapic_sysdev_class);
1762         if (error)
1763                 return error;
1764
1765         for (i = 0; i < nr_ioapics; i++ ) {
1766                 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
1767                         * sizeof(struct IO_APIC_route_entry);
1768                 mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
1769                 if (!mp_ioapic_data[i]) {
1770                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1771                         continue;
1772                 }
1773                 memset(mp_ioapic_data[i], 0, size);
1774                 dev = &mp_ioapic_data[i]->dev;
1775                 dev->id = i;
1776                 dev->cls = &ioapic_sysdev_class;
1777                 error = sysdev_register(dev);
1778                 if (error) {
1779                         kfree(mp_ioapic_data[i]);
1780                         mp_ioapic_data[i] = NULL;
1781                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1782                         continue;
1783                 }
1784         }
1785
1786         return 0;
1787 }
1788
1789 device_initcall(ioapic_init_sysfs);
1790
1791 /*
1792  * Dynamic irq allocate and deallocation
1793  */
1794 int create_irq(void)
1795 {
1796         /* Allocate an unused irq */
1797         int irq;
1798         int new;
1799         unsigned long flags;
1800
1801         irq = -ENOSPC;
1802         spin_lock_irqsave(&vector_lock, flags);
1803         for (new = (NR_IRQS - 1); new >= 0; new--) {
1804                 if (platform_legacy_irq(new))
1805                         continue;
1806                 if (irq_cfg[new].vector != 0)
1807                         continue;
1808                 if (__assign_irq_vector(new, TARGET_CPUS) == 0)
1809                         irq = new;
1810                 break;
1811         }
1812         spin_unlock_irqrestore(&vector_lock, flags);
1813
1814         if (irq >= 0) {
1815                 dynamic_irq_init(irq);
1816         }
1817         return irq;
1818 }
1819
1820 void destroy_irq(unsigned int irq)
1821 {
1822         unsigned long flags;
1823
1824         dynamic_irq_cleanup(irq);
1825
1826         spin_lock_irqsave(&vector_lock, flags);
1827         __clear_irq_vector(irq);
1828         spin_unlock_irqrestore(&vector_lock, flags);
1829 }
1830
1831 /*
1832  * MSI mesage composition
1833  */
1834 #ifdef CONFIG_PCI_MSI
1835 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
1836 {
1837         struct irq_cfg *cfg = irq_cfg + irq;
1838         int err;
1839         unsigned dest;
1840         cpumask_t tmp;
1841
1842         tmp = TARGET_CPUS;
1843         err = assign_irq_vector(irq, tmp);
1844         if (!err) {
1845                 cpus_and(tmp, cfg->domain, tmp);
1846                 dest = cpu_mask_to_apicid(tmp);
1847
1848                 msg->address_hi = MSI_ADDR_BASE_HI;
1849                 msg->address_lo =
1850                         MSI_ADDR_BASE_LO |
1851                         ((INT_DEST_MODE == 0) ?
1852                                 MSI_ADDR_DEST_MODE_PHYSICAL:
1853                                 MSI_ADDR_DEST_MODE_LOGICAL) |
1854                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1855                                 MSI_ADDR_REDIRECTION_CPU:
1856                                 MSI_ADDR_REDIRECTION_LOWPRI) |
1857                         MSI_ADDR_DEST_ID(dest);
1858
1859                 msg->data =
1860                         MSI_DATA_TRIGGER_EDGE |
1861                         MSI_DATA_LEVEL_ASSERT |
1862                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1863                                 MSI_DATA_DELIVERY_FIXED:
1864                                 MSI_DATA_DELIVERY_LOWPRI) |
1865                         MSI_DATA_VECTOR(cfg->vector);
1866         }
1867         return err;
1868 }
1869
1870 #ifdef CONFIG_SMP
1871 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
1872 {
1873         struct irq_cfg *cfg = irq_cfg + irq;
1874         struct msi_msg msg;
1875         unsigned int dest;
1876         cpumask_t tmp;
1877
1878         cpus_and(tmp, mask, cpu_online_map);
1879         if (cpus_empty(tmp))
1880                 return;
1881
1882         if (assign_irq_vector(irq, mask))
1883                 return;
1884
1885         cpus_and(tmp, cfg->domain, mask);
1886         dest = cpu_mask_to_apicid(tmp);
1887
1888         read_msi_msg(irq, &msg);
1889
1890         msg.data &= ~MSI_DATA_VECTOR_MASK;
1891         msg.data |= MSI_DATA_VECTOR(cfg->vector);
1892         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
1893         msg.address_lo |= MSI_ADDR_DEST_ID(dest);
1894
1895         write_msi_msg(irq, &msg);
1896         irq_desc[irq].affinity = mask;
1897 }
1898 #endif /* CONFIG_SMP */
1899
1900 /*
1901  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
1902  * which implement the MSI or MSI-X Capability Structure.
1903  */
1904 static struct irq_chip msi_chip = {
1905         .name           = "PCI-MSI",
1906         .unmask         = unmask_msi_irq,
1907         .mask           = mask_msi_irq,
1908         .ack            = ack_apic_edge,
1909 #ifdef CONFIG_SMP
1910         .set_affinity   = set_msi_irq_affinity,
1911 #endif
1912         .retrigger      = ioapic_retrigger_irq,
1913 };
1914
1915 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
1916 {
1917         struct msi_msg msg;
1918         int irq, ret;
1919         irq = create_irq();
1920         if (irq < 0)
1921                 return irq;
1922
1923         set_irq_msi(irq, desc);
1924         ret = msi_compose_msg(dev, irq, &msg);
1925         if (ret < 0) {
1926                 destroy_irq(irq);
1927                 return ret;
1928         }
1929
1930         write_msi_msg(irq, &msg);
1931
1932         set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
1933
1934         return irq;
1935 }
1936
1937 void arch_teardown_msi_irq(unsigned int irq)
1938 {
1939         destroy_irq(irq);
1940 }
1941
1942 #endif /* CONFIG_PCI_MSI */
1943
1944 /*
1945  * Hypertransport interrupt support
1946  */
1947 #ifdef CONFIG_HT_IRQ
1948
1949 #ifdef CONFIG_SMP
1950
1951 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
1952 {
1953         struct ht_irq_msg msg;
1954         fetch_ht_irq_msg(irq, &msg);
1955
1956         msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
1957         msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
1958
1959         msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
1960         msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
1961
1962         write_ht_irq_msg(irq, &msg);
1963 }
1964
1965 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
1966 {
1967         struct irq_cfg *cfg = irq_cfg + irq;
1968         unsigned int dest;
1969         cpumask_t tmp;
1970
1971         cpus_and(tmp, mask, cpu_online_map);
1972         if (cpus_empty(tmp))
1973                 return;
1974
1975         if (assign_irq_vector(irq, mask))
1976                 return;
1977
1978         cpus_and(tmp, cfg->domain, mask);
1979         dest = cpu_mask_to_apicid(tmp);
1980
1981         target_ht_irq(irq, dest, cfg->vector);
1982         irq_desc[irq].affinity = mask;
1983 }
1984 #endif
1985
1986 static struct irq_chip ht_irq_chip = {
1987         .name           = "PCI-HT",
1988         .mask           = mask_ht_irq,
1989         .unmask         = unmask_ht_irq,
1990         .ack            = ack_apic_edge,
1991 #ifdef CONFIG_SMP
1992         .set_affinity   = set_ht_irq_affinity,
1993 #endif
1994         .retrigger      = ioapic_retrigger_irq,
1995 };
1996
1997 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
1998 {
1999         struct irq_cfg *cfg = irq_cfg + irq;
2000         int err;
2001         cpumask_t tmp;
2002
2003         tmp = TARGET_CPUS;
2004         err = assign_irq_vector(irq, tmp);
2005         if (!err) {
2006                 struct ht_irq_msg msg;
2007                 unsigned dest;
2008
2009                 cpus_and(tmp, cfg->domain, tmp);
2010                 dest = cpu_mask_to_apicid(tmp);
2011
2012                 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
2013
2014                 msg.address_lo =
2015                         HT_IRQ_LOW_BASE |
2016                         HT_IRQ_LOW_DEST_ID(dest) |
2017                         HT_IRQ_LOW_VECTOR(cfg->vector) |
2018                         ((INT_DEST_MODE == 0) ?
2019                                 HT_IRQ_LOW_DM_PHYSICAL :
2020                                 HT_IRQ_LOW_DM_LOGICAL) |
2021                         HT_IRQ_LOW_RQEOI_EDGE |
2022                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2023                                 HT_IRQ_LOW_MT_FIXED :
2024                                 HT_IRQ_LOW_MT_ARBITRATED) |
2025                         HT_IRQ_LOW_IRQ_MASKED;
2026
2027                 write_ht_irq_msg(irq, &msg);
2028
2029                 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2030                                               handle_edge_irq, "edge");
2031         }
2032         return err;
2033 }
2034 #endif /* CONFIG_HT_IRQ */
2035
2036 /* --------------------------------------------------------------------------
2037                           ACPI-based IOAPIC Configuration
2038    -------------------------------------------------------------------------- */
2039
2040 #ifdef CONFIG_ACPI
2041
2042 #define IO_APIC_MAX_ID          0xFE
2043
2044 int __init io_apic_get_redir_entries (int ioapic)
2045 {
2046         union IO_APIC_reg_01    reg_01;
2047         unsigned long flags;
2048
2049         spin_lock_irqsave(&ioapic_lock, flags);
2050         reg_01.raw = io_apic_read(ioapic, 1);
2051         spin_unlock_irqrestore(&ioapic_lock, flags);
2052
2053         return reg_01.bits.entries;
2054 }
2055
2056
2057 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
2058 {
2059         if (!IO_APIC_IRQ(irq)) {
2060                 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2061                         ioapic);
2062                 return -EINVAL;
2063         }
2064
2065         /*
2066          * IRQs < 16 are already in the irq_2_pin[] map
2067          */
2068         if (irq >= 16)
2069                 add_pin_to_irq(irq, ioapic, pin);
2070
2071         setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
2072
2073         return 0;
2074 }
2075
2076 #endif /* CONFIG_ACPI */
2077
2078
2079 /*
2080  * This function currently is only a helper for the i386 smp boot process where
2081  * we need to reprogram the ioredtbls to cater for the cpus which have come online
2082  * so mask in all cases should simply be TARGET_CPUS
2083  */
2084 #ifdef CONFIG_SMP
2085 void __init setup_ioapic_dest(void)
2086 {
2087         int pin, ioapic, irq, irq_entry;
2088
2089         if (skip_ioapic_setup == 1)
2090                 return;
2091
2092         for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
2093                 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
2094                         irq_entry = find_irq_entry(ioapic, pin, mp_INT);
2095                         if (irq_entry == -1)
2096                                 continue;
2097                         irq = pin_2_irq(irq_entry, ioapic, pin);
2098
2099                         /* setup_IO_APIC_irqs could fail to get vector for some device
2100                          * when you have too many devices, because at that time only boot
2101                          * cpu is online.
2102                          */
2103                         if (!irq_cfg[irq].vector)
2104                                 setup_IO_APIC_irq(ioapic, pin, irq,
2105                                                   irq_trigger(irq_entry),
2106                                                   irq_polarity(irq_entry));
2107                         else
2108                                 set_ioapic_affinity_irq(irq, TARGET_CPUS);
2109                 }
2110
2111         }
2112 }
2113 #endif