b7d2b76b92d4f395948d9e93d78cb4728dcf909f
[sfrench/cifs-2.6.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/idle.h>
40 #include <asm/io.h>
41 #include <asm/smp.h>
42 #include <asm/desc.h>
43 #include <asm/proto.h>
44 #include <asm/mach_apic.h>
45 #include <asm/acpi.h>
46 #include <asm/dma.h>
47 #include <asm/nmi.h>
48 #include <asm/msidef.h>
49 #include <asm/hypertransport.h>
50
51 struct irq_cfg {
52         cpumask_t domain;
53         cpumask_t old_domain;
54         unsigned move_cleanup_count;
55         u8 vector;
56         u8 move_in_progress : 1;
57 };
58
59 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
60 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
61         [0]  = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR,  },
62         [1]  = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR,  },
63         [2]  = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR,  },
64         [3]  = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR,  },
65         [4]  = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR,  },
66         [5]  = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR,  },
67         [6]  = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR,  },
68         [7]  = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR,  },
69         [8]  = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR,  },
70         [9]  = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR,  },
71         [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
72         [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
73         [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
74         [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
75         [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
76         [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
77 };
78
79 static int assign_irq_vector(int irq, cpumask_t mask);
80
81 #define __apicdebuginit  __init
82
83 int sis_apic_bug; /* not actually supported, dummy for compile */
84
85 static int no_timer_check;
86
87 static int disable_timer_pin_1 __initdata;
88
89 int timer_over_8254 __initdata = 1;
90
91 /* Where if anywhere is the i8259 connect in external int mode */
92 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
93
94 static DEFINE_SPINLOCK(ioapic_lock);
95 DEFINE_SPINLOCK(vector_lock);
96
97 /*
98  * # of IRQ routing registers
99  */
100 int nr_ioapic_registers[MAX_IO_APICS];
101
102 /*
103  * Rough estimation of how many shared IRQs there are, can
104  * be changed anytime.
105  */
106 #define MAX_PLUS_SHARED_IRQS NR_IRQS
107 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
108
109 /*
110  * This is performance-critical, we want to do it O(1)
111  *
112  * the indexing order of this array favors 1:1 mappings
113  * between pins and IRQs.
114  */
115
116 static struct irq_pin_list {
117         short apic, pin, next;
118 } irq_2_pin[PIN_MAP_SIZE];
119
120 struct io_apic {
121         unsigned int index;
122         unsigned int unused[3];
123         unsigned int data;
124 };
125
126 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
127 {
128         return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
129                 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
130 }
131
132 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
133 {
134         struct io_apic __iomem *io_apic = io_apic_base(apic);
135         writel(reg, &io_apic->index);
136         return readl(&io_apic->data);
137 }
138
139 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
140 {
141         struct io_apic __iomem *io_apic = io_apic_base(apic);
142         writel(reg, &io_apic->index);
143         writel(value, &io_apic->data);
144 }
145
146 /*
147  * Re-write a value: to be used for read-modify-write
148  * cycles where the read already set up the index register.
149  */
150 static inline void io_apic_modify(unsigned int apic, unsigned int value)
151 {
152         struct io_apic __iomem *io_apic = io_apic_base(apic);
153         writel(value, &io_apic->data);
154 }
155
156 /*
157  * Synchronize the IO-APIC and the CPU by doing
158  * a dummy read from the IO-APIC
159  */
160 static inline void io_apic_sync(unsigned int apic)
161 {
162         struct io_apic __iomem *io_apic = io_apic_base(apic);
163         readl(&io_apic->data);
164 }
165
166 #define __DO_ACTION(R, ACTION, FINAL)                                   \
167                                                                         \
168 {                                                                       \
169         int pin;                                                        \
170         struct irq_pin_list *entry = irq_2_pin + irq;                   \
171                                                                         \
172         BUG_ON(irq >= NR_IRQS);                                         \
173         for (;;) {                                                      \
174                 unsigned int reg;                                       \
175                 pin = entry->pin;                                       \
176                 if (pin == -1)                                          \
177                         break;                                          \
178                 reg = io_apic_read(entry->apic, 0x10 + R + pin*2);      \
179                 reg ACTION;                                             \
180                 io_apic_modify(entry->apic, reg);                       \
181                 FINAL;                                                  \
182                 if (!entry->next)                                       \
183                         break;                                          \
184                 entry = irq_2_pin + entry->next;                        \
185         }                                                               \
186 }
187
188 union entry_union {
189         struct { u32 w1, w2; };
190         struct IO_APIC_route_entry entry;
191 };
192
193 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
194 {
195         union entry_union eu;
196         unsigned long flags;
197         spin_lock_irqsave(&ioapic_lock, flags);
198         eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
199         eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
200         spin_unlock_irqrestore(&ioapic_lock, flags);
201         return eu.entry;
202 }
203
204 /*
205  * When we write a new IO APIC routing entry, we need to write the high
206  * word first! If the mask bit in the low word is clear, we will enable
207  * the interrupt, and we need to make sure the entry is fully populated
208  * before that happens.
209  */
210 static void
211 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
212 {
213         union entry_union eu;
214         eu.entry = e;
215         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
216         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
217 }
218
219 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
220 {
221         unsigned long flags;
222         spin_lock_irqsave(&ioapic_lock, flags);
223         __ioapic_write_entry(apic, pin, e);
224         spin_unlock_irqrestore(&ioapic_lock, flags);
225 }
226
227 /*
228  * When we mask an IO APIC routing entry, we need to write the low
229  * word first, in order to set the mask bit before we change the
230  * high bits!
231  */
232 static void ioapic_mask_entry(int apic, int pin)
233 {
234         unsigned long flags;
235         union entry_union eu = { .entry.mask = 1 };
236
237         spin_lock_irqsave(&ioapic_lock, flags);
238         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
239         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
240         spin_unlock_irqrestore(&ioapic_lock, flags);
241 }
242
243 #ifdef CONFIG_SMP
244 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
245 {
246         int apic, pin;
247         struct irq_pin_list *entry = irq_2_pin + irq;
248
249         BUG_ON(irq >= NR_IRQS);
250         for (;;) {
251                 unsigned int reg;
252                 apic = entry->apic;
253                 pin = entry->pin;
254                 if (pin == -1)
255                         break;
256                 io_apic_write(apic, 0x11 + pin*2, dest);
257                 reg = io_apic_read(apic, 0x10 + pin*2);
258                 reg &= ~0x000000ff;
259                 reg |= vector;
260                 io_apic_modify(apic, reg);
261                 if (!entry->next)
262                         break;
263                 entry = irq_2_pin + entry->next;
264         }
265 }
266
267 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
268 {
269         struct irq_cfg *cfg = irq_cfg + irq;
270         unsigned long flags;
271         unsigned int dest;
272         cpumask_t tmp;
273
274         cpus_and(tmp, mask, cpu_online_map);
275         if (cpus_empty(tmp))
276                 return;
277
278         if (assign_irq_vector(irq, mask))
279                 return;
280
281         cpus_and(tmp, cfg->domain, mask);
282         dest = cpu_mask_to_apicid(tmp);
283
284         /*
285          * Only the high 8 bits are valid.
286          */
287         dest = SET_APIC_LOGICAL_ID(dest);
288
289         spin_lock_irqsave(&ioapic_lock, flags);
290         __target_IO_APIC_irq(irq, dest, cfg->vector);
291         irq_desc[irq].affinity = mask;
292         spin_unlock_irqrestore(&ioapic_lock, flags);
293 }
294 #endif
295
296 /*
297  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
298  * shared ISA-space IRQs, so we have to support them. We are super
299  * fast in the common case, and fast for shared ISA-space IRQs.
300  */
301 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
302 {
303         static int first_free_entry = NR_IRQS;
304         struct irq_pin_list *entry = irq_2_pin + irq;
305
306         BUG_ON(irq >= NR_IRQS);
307         while (entry->next)
308                 entry = irq_2_pin + entry->next;
309
310         if (entry->pin != -1) {
311                 entry->next = first_free_entry;
312                 entry = irq_2_pin + entry->next;
313                 if (++first_free_entry >= PIN_MAP_SIZE)
314                         panic("io_apic.c: ran out of irq_2_pin entries!");
315         }
316         entry->apic = apic;
317         entry->pin = pin;
318 }
319
320
321 #define DO_ACTION(name,R,ACTION, FINAL)                                 \
322                                                                         \
323         static void name##_IO_APIC_irq (unsigned int irq)               \
324         __DO_ACTION(R, ACTION, FINAL)
325
326 DO_ACTION( __mask,             0, |= 0x00010000, io_apic_sync(entry->apic) )
327                                                 /* mask = 1 */
328 DO_ACTION( __unmask,           0, &= 0xfffeffff, )
329                                                 /* mask = 0 */
330
331 static void mask_IO_APIC_irq (unsigned int irq)
332 {
333         unsigned long flags;
334
335         spin_lock_irqsave(&ioapic_lock, flags);
336         __mask_IO_APIC_irq(irq);
337         spin_unlock_irqrestore(&ioapic_lock, flags);
338 }
339
340 static void unmask_IO_APIC_irq (unsigned int irq)
341 {
342         unsigned long flags;
343
344         spin_lock_irqsave(&ioapic_lock, flags);
345         __unmask_IO_APIC_irq(irq);
346         spin_unlock_irqrestore(&ioapic_lock, flags);
347 }
348
349 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
350 {
351         struct IO_APIC_route_entry entry;
352
353         /* Check delivery_mode to be sure we're not clearing an SMI pin */
354         entry = ioapic_read_entry(apic, pin);
355         if (entry.delivery_mode == dest_SMI)
356                 return;
357         /*
358          * Disable it in the IO-APIC irq-routing table:
359          */
360         ioapic_mask_entry(apic, pin);
361 }
362
363 static void clear_IO_APIC (void)
364 {
365         int apic, pin;
366
367         for (apic = 0; apic < nr_ioapics; apic++)
368                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
369                         clear_IO_APIC_pin(apic, pin);
370 }
371
372 int skip_ioapic_setup;
373 int ioapic_force;
374
375 /* dummy parsing: see setup.c */
376
377 static int __init disable_ioapic_setup(char *str)
378 {
379         skip_ioapic_setup = 1;
380         return 0;
381 }
382 early_param("noapic", disable_ioapic_setup);
383
384 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
385 static int __init disable_timer_pin_setup(char *arg)
386 {
387         disable_timer_pin_1 = 1;
388         return 1;
389 }
390 __setup("disable_timer_pin_1", disable_timer_pin_setup);
391
392 static int __init setup_disable_8254_timer(char *s)
393 {
394         timer_over_8254 = -1;
395         return 1;
396 }
397 static int __init setup_enable_8254_timer(char *s)
398 {
399         timer_over_8254 = 2;
400         return 1;
401 }
402
403 __setup("disable_8254_timer", setup_disable_8254_timer);
404 __setup("enable_8254_timer", setup_enable_8254_timer);
405
406
407 /*
408  * Find the IRQ entry number of a certain pin.
409  */
410 static int find_irq_entry(int apic, int pin, int type)
411 {
412         int i;
413
414         for (i = 0; i < mp_irq_entries; i++)
415                 if (mp_irqs[i].mpc_irqtype == type &&
416                     (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
417                      mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
418                     mp_irqs[i].mpc_dstirq == pin)
419                         return i;
420
421         return -1;
422 }
423
424 /*
425  * Find the pin to which IRQ[irq] (ISA) is connected
426  */
427 static int __init find_isa_irq_pin(int irq, int type)
428 {
429         int i;
430
431         for (i = 0; i < mp_irq_entries; i++) {
432                 int lbus = mp_irqs[i].mpc_srcbus;
433
434                 if (test_bit(lbus, mp_bus_not_pci) &&
435                     (mp_irqs[i].mpc_irqtype == type) &&
436                     (mp_irqs[i].mpc_srcbusirq == irq))
437
438                         return mp_irqs[i].mpc_dstirq;
439         }
440         return -1;
441 }
442
443 static int __init find_isa_irq_apic(int irq, int type)
444 {
445         int i;
446
447         for (i = 0; i < mp_irq_entries; i++) {
448                 int lbus = mp_irqs[i].mpc_srcbus;
449
450                 if (test_bit(lbus, mp_bus_not_pci) &&
451                     (mp_irqs[i].mpc_irqtype == type) &&
452                     (mp_irqs[i].mpc_srcbusirq == irq))
453                         break;
454         }
455         if (i < mp_irq_entries) {
456                 int apic;
457                 for(apic = 0; apic < nr_ioapics; apic++) {
458                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
459                                 return apic;
460                 }
461         }
462
463         return -1;
464 }
465
466 /*
467  * Find a specific PCI IRQ entry.
468  * Not an __init, possibly needed by modules
469  */
470 static int pin_2_irq(int idx, int apic, int pin);
471
472 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
473 {
474         int apic, i, best_guess = -1;
475
476         apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
477                 bus, slot, pin);
478         if (mp_bus_id_to_pci_bus[bus] == -1) {
479                 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
480                 return -1;
481         }
482         for (i = 0; i < mp_irq_entries; i++) {
483                 int lbus = mp_irqs[i].mpc_srcbus;
484
485                 for (apic = 0; apic < nr_ioapics; apic++)
486                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
487                             mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
488                                 break;
489
490                 if (!test_bit(lbus, mp_bus_not_pci) &&
491                     !mp_irqs[i].mpc_irqtype &&
492                     (bus == lbus) &&
493                     (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
494                         int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
495
496                         if (!(apic || IO_APIC_IRQ(irq)))
497                                 continue;
498
499                         if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
500                                 return irq;
501                         /*
502                          * Use the first all-but-pin matching entry as a
503                          * best-guess fuzzy result for broken mptables.
504                          */
505                         if (best_guess < 0)
506                                 best_guess = irq;
507                 }
508         }
509         BUG_ON(best_guess >= NR_IRQS);
510         return best_guess;
511 }
512
513 /* ISA interrupts are always polarity zero edge triggered,
514  * when listed as conforming in the MP table. */
515
516 #define default_ISA_trigger(idx)        (0)
517 #define default_ISA_polarity(idx)       (0)
518
519 /* PCI interrupts are always polarity one level triggered,
520  * when listed as conforming in the MP table. */
521
522 #define default_PCI_trigger(idx)        (1)
523 #define default_PCI_polarity(idx)       (1)
524
525 static int __init MPBIOS_polarity(int idx)
526 {
527         int bus = mp_irqs[idx].mpc_srcbus;
528         int polarity;
529
530         /*
531          * Determine IRQ line polarity (high active or low active):
532          */
533         switch (mp_irqs[idx].mpc_irqflag & 3)
534         {
535                 case 0: /* conforms, ie. bus-type dependent polarity */
536                         if (test_bit(bus, mp_bus_not_pci))
537                                 polarity = default_ISA_polarity(idx);
538                         else
539                                 polarity = default_PCI_polarity(idx);
540                         break;
541                 case 1: /* high active */
542                 {
543                         polarity = 0;
544                         break;
545                 }
546                 case 2: /* reserved */
547                 {
548                         printk(KERN_WARNING "broken BIOS!!\n");
549                         polarity = 1;
550                         break;
551                 }
552                 case 3: /* low active */
553                 {
554                         polarity = 1;
555                         break;
556                 }
557                 default: /* invalid */
558                 {
559                         printk(KERN_WARNING "broken BIOS!!\n");
560                         polarity = 1;
561                         break;
562                 }
563         }
564         return polarity;
565 }
566
567 static int MPBIOS_trigger(int idx)
568 {
569         int bus = mp_irqs[idx].mpc_srcbus;
570         int trigger;
571
572         /*
573          * Determine IRQ trigger mode (edge or level sensitive):
574          */
575         switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
576         {
577                 case 0: /* conforms, ie. bus-type dependent */
578                         if (test_bit(bus, mp_bus_not_pci))
579                                 trigger = default_ISA_trigger(idx);
580                         else
581                                 trigger = default_PCI_trigger(idx);
582                         break;
583                 case 1: /* edge */
584                 {
585                         trigger = 0;
586                         break;
587                 }
588                 case 2: /* reserved */
589                 {
590                         printk(KERN_WARNING "broken BIOS!!\n");
591                         trigger = 1;
592                         break;
593                 }
594                 case 3: /* level */
595                 {
596                         trigger = 1;
597                         break;
598                 }
599                 default: /* invalid */
600                 {
601                         printk(KERN_WARNING "broken BIOS!!\n");
602                         trigger = 0;
603                         break;
604                 }
605         }
606         return trigger;
607 }
608
609 static inline int irq_polarity(int idx)
610 {
611         return MPBIOS_polarity(idx);
612 }
613
614 static inline int irq_trigger(int idx)
615 {
616         return MPBIOS_trigger(idx);
617 }
618
619 static int pin_2_irq(int idx, int apic, int pin)
620 {
621         int irq, i;
622         int bus = mp_irqs[idx].mpc_srcbus;
623
624         /*
625          * Debugging check, we are in big trouble if this message pops up!
626          */
627         if (mp_irqs[idx].mpc_dstirq != pin)
628                 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
629
630         if (test_bit(bus, mp_bus_not_pci)) {
631                 irq = mp_irqs[idx].mpc_srcbusirq;
632         } else {
633                 /*
634                  * PCI IRQs are mapped in order
635                  */
636                 i = irq = 0;
637                 while (i < apic)
638                         irq += nr_ioapic_registers[i++];
639                 irq += pin;
640         }
641         BUG_ON(irq >= NR_IRQS);
642         return irq;
643 }
644
645 static int __assign_irq_vector(int irq, cpumask_t mask)
646 {
647         /*
648          * NOTE! The local APIC isn't very good at handling
649          * multiple interrupts at the same interrupt level.
650          * As the interrupt level is determined by taking the
651          * vector number and shifting that right by 4, we
652          * want to spread these out a bit so that they don't
653          * all fall in the same interrupt level.
654          *
655          * Also, we've got to be careful not to trash gate
656          * 0x80, because int 0x80 is hm, kind of importantish. ;)
657          */
658         static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
659         unsigned int old_vector;
660         int cpu;
661         struct irq_cfg *cfg;
662
663         BUG_ON((unsigned)irq >= NR_IRQS);
664         cfg = &irq_cfg[irq];
665
666         /* Only try and allocate irqs on cpus that are present */
667         cpus_and(mask, mask, cpu_online_map);
668
669         if ((cfg->move_in_progress) || cfg->move_cleanup_count)
670                 return -EBUSY;
671
672         old_vector = cfg->vector;
673         if (old_vector) {
674                 cpumask_t tmp;
675                 cpus_and(tmp, cfg->domain, mask);
676                 if (!cpus_empty(tmp))
677                         return 0;
678         }
679
680         for_each_cpu_mask(cpu, mask) {
681                 cpumask_t domain, new_mask;
682                 int new_cpu;
683                 int vector, offset;
684
685                 domain = vector_allocation_domain(cpu);
686                 cpus_and(new_mask, domain, cpu_online_map);
687
688                 vector = current_vector;
689                 offset = current_offset;
690 next:
691                 vector += 8;
692                 if (vector >= FIRST_SYSTEM_VECTOR) {
693                         /* If we run out of vectors on large boxen, must share them. */
694                         offset = (offset + 1) % 8;
695                         vector = FIRST_DEVICE_VECTOR + offset;
696                 }
697                 if (unlikely(current_vector == vector))
698                         continue;
699                 if (vector == IA32_SYSCALL_VECTOR)
700                         goto next;
701                 for_each_cpu_mask(new_cpu, new_mask)
702                         if (per_cpu(vector_irq, new_cpu)[vector] != -1)
703                                 goto next;
704                 /* Found one! */
705                 current_vector = vector;
706                 current_offset = offset;
707                 if (old_vector) {
708                         cfg->move_in_progress = 1;
709                         cfg->old_domain = cfg->domain;
710                 }
711                 for_each_cpu_mask(new_cpu, new_mask)
712                         per_cpu(vector_irq, new_cpu)[vector] = irq;
713                 cfg->vector = vector;
714                 cfg->domain = domain;
715                 return 0;
716         }
717         return -ENOSPC;
718 }
719
720 static int assign_irq_vector(int irq, cpumask_t mask)
721 {
722         int err;
723         unsigned long flags;
724
725         spin_lock_irqsave(&vector_lock, flags);
726         err = __assign_irq_vector(irq, mask);
727         spin_unlock_irqrestore(&vector_lock, flags);
728         return err;
729 }
730
731 static void __clear_irq_vector(int irq)
732 {
733         struct irq_cfg *cfg;
734         cpumask_t mask;
735         int cpu, vector;
736
737         BUG_ON((unsigned)irq >= NR_IRQS);
738         cfg = &irq_cfg[irq];
739         BUG_ON(!cfg->vector);
740
741         vector = cfg->vector;
742         cpus_and(mask, cfg->domain, cpu_online_map);
743         for_each_cpu_mask(cpu, mask)
744                 per_cpu(vector_irq, cpu)[vector] = -1;
745
746         cfg->vector = 0;
747         cfg->domain = CPU_MASK_NONE;
748 }
749
750 void __setup_vector_irq(int cpu)
751 {
752         /* Initialize vector_irq on a new cpu */
753         /* This function must be called with vector_lock held */
754         int irq, vector;
755
756         /* Mark the inuse vectors */
757         for (irq = 0; irq < NR_IRQS; ++irq) {
758                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
759                         continue;
760                 vector = irq_cfg[irq].vector;
761                 per_cpu(vector_irq, cpu)[vector] = irq;
762         }
763         /* Mark the free vectors */
764         for (vector = 0; vector < NR_VECTORS; ++vector) {
765                 irq = per_cpu(vector_irq, cpu)[vector];
766                 if (irq < 0)
767                         continue;
768                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
769                         per_cpu(vector_irq, cpu)[vector] = -1;
770         }
771 }
772
773
774 static struct irq_chip ioapic_chip;
775
776 static void ioapic_register_intr(int irq, unsigned long trigger)
777 {
778         if (trigger)
779                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
780                                               handle_fasteoi_irq, "fasteoi");
781         else
782                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
783                                               handle_edge_irq, "edge");
784 }
785
786 static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
787                               int trigger, int polarity)
788 {
789         struct irq_cfg *cfg = irq_cfg + irq;
790         struct IO_APIC_route_entry entry;
791         cpumask_t mask;
792
793         if (!IO_APIC_IRQ(irq))
794                 return;
795
796         mask = TARGET_CPUS;
797         if (assign_irq_vector(irq, mask))
798                 return;
799
800         cpus_and(mask, cfg->domain, mask);
801
802         apic_printk(APIC_VERBOSE,KERN_DEBUG
803                     "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
804                     "IRQ %d Mode:%i Active:%i)\n",
805                     apic, mp_ioapics[apic].mpc_apicid, pin, cfg->vector,
806                     irq, trigger, polarity);
807
808         /*
809          * add it to the IO-APIC irq-routing table:
810          */
811         memset(&entry,0,sizeof(entry));
812
813         entry.delivery_mode = INT_DELIVERY_MODE;
814         entry.dest_mode = INT_DEST_MODE;
815         entry.dest = cpu_mask_to_apicid(mask);
816         entry.mask = 0;                         /* enable IRQ */
817         entry.trigger = trigger;
818         entry.polarity = polarity;
819         entry.vector = cfg->vector;
820
821         /* Mask level triggered irqs.
822          * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
823          */
824         if (trigger)
825                 entry.mask = 1;
826
827         ioapic_register_intr(irq, trigger);
828         if (irq < 16)
829                 disable_8259A_irq(irq);
830
831         ioapic_write_entry(apic, pin, entry);
832 }
833
834 static void __init setup_IO_APIC_irqs(void)
835 {
836         int apic, pin, idx, irq, first_notcon = 1;
837
838         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
839
840         for (apic = 0; apic < nr_ioapics; apic++) {
841         for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
842
843                 idx = find_irq_entry(apic,pin,mp_INT);
844                 if (idx == -1) {
845                         if (first_notcon) {
846                                 apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
847                                 first_notcon = 0;
848                         } else
849                                 apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
850                         continue;
851                 }
852
853                 irq = pin_2_irq(idx, apic, pin);
854                 add_pin_to_irq(irq, apic, pin);
855
856                 setup_IO_APIC_irq(apic, pin, irq,
857                                   irq_trigger(idx), irq_polarity(idx));
858         }
859         }
860
861         if (!first_notcon)
862                 apic_printk(APIC_VERBOSE," not connected.\n");
863 }
864
865 /*
866  * Set up the 8259A-master output pin as broadcast to all
867  * CPUs.
868  */
869 static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
870 {
871         struct IO_APIC_route_entry entry;
872         unsigned long flags;
873
874         memset(&entry,0,sizeof(entry));
875
876         disable_8259A_irq(0);
877
878         /* mask LVT0 */
879         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
880
881         /*
882          * We use logical delivery to get the timer IRQ
883          * to the first CPU.
884          */
885         entry.dest_mode = INT_DEST_MODE;
886         entry.mask = 0;                                 /* unmask IRQ now */
887         entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
888         entry.delivery_mode = INT_DELIVERY_MODE;
889         entry.polarity = 0;
890         entry.trigger = 0;
891         entry.vector = vector;
892
893         /*
894          * The timer IRQ doesn't have to know that behind the
895          * scene we have a 8259A-master in AEOI mode ...
896          */
897         set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
898
899         /*
900          * Add it to the IO-APIC irq-routing table:
901          */
902         spin_lock_irqsave(&ioapic_lock, flags);
903         io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
904         io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
905         spin_unlock_irqrestore(&ioapic_lock, flags);
906
907         enable_8259A_irq(0);
908 }
909
910 void __init UNEXPECTED_IO_APIC(void)
911 {
912 }
913
914 void __apicdebuginit print_IO_APIC(void)
915 {
916         int apic, i;
917         union IO_APIC_reg_00 reg_00;
918         union IO_APIC_reg_01 reg_01;
919         union IO_APIC_reg_02 reg_02;
920         unsigned long flags;
921
922         if (apic_verbosity == APIC_QUIET)
923                 return;
924
925         printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
926         for (i = 0; i < nr_ioapics; i++)
927                 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
928                        mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
929
930         /*
931          * We are a bit conservative about what we expect.  We have to
932          * know about every hardware change ASAP.
933          */
934         printk(KERN_INFO "testing the IO APIC.......................\n");
935
936         for (apic = 0; apic < nr_ioapics; apic++) {
937
938         spin_lock_irqsave(&ioapic_lock, flags);
939         reg_00.raw = io_apic_read(apic, 0);
940         reg_01.raw = io_apic_read(apic, 1);
941         if (reg_01.bits.version >= 0x10)
942                 reg_02.raw = io_apic_read(apic, 2);
943         spin_unlock_irqrestore(&ioapic_lock, flags);
944
945         printk("\n");
946         printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
947         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
948         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
949         if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
950                 UNEXPECTED_IO_APIC();
951
952         printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
953         printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);
954         if (    (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
955                 (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
956                 (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
957                 (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
958                 (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
959                 (reg_01.bits.entries != 0x2E) &&
960                 (reg_01.bits.entries != 0x3F) &&
961                 (reg_01.bits.entries != 0x03) 
962         )
963                 UNEXPECTED_IO_APIC();
964
965         printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
966         printk(KERN_DEBUG ".......     : IO APIC version: %04X\n", reg_01.bits.version);
967         if (    (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
968                 (reg_01.bits.version != 0x02) && /* 82801BA IO-APICs (ICH2) */
969                 (reg_01.bits.version != 0x10) && /* oldest IO-APICs */
970                 (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
971                 (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
972                 (reg_01.bits.version != 0x20)    /* Intel P64H (82806 AA) */
973         )
974                 UNEXPECTED_IO_APIC();
975         if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
976                 UNEXPECTED_IO_APIC();
977
978         if (reg_01.bits.version >= 0x10) {
979                 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
980                 printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
981                 if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
982                         UNEXPECTED_IO_APIC();
983         }
984
985         printk(KERN_DEBUG ".... IRQ redirection table:\n");
986
987         printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
988                           " Stat Dmod Deli Vect:   \n");
989
990         for (i = 0; i <= reg_01.bits.entries; i++) {
991                 struct IO_APIC_route_entry entry;
992
993                 entry = ioapic_read_entry(apic, i);
994
995                 printk(KERN_DEBUG " %02x %03X ",
996                         i,
997                         entry.dest
998                 );
999
1000                 printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
1001                         entry.mask,
1002                         entry.trigger,
1003                         entry.irr,
1004                         entry.polarity,
1005                         entry.delivery_status,
1006                         entry.dest_mode,
1007                         entry.delivery_mode,
1008                         entry.vector
1009                 );
1010         }
1011         }
1012         printk(KERN_DEBUG "IRQ to pin mappings:\n");
1013         for (i = 0; i < NR_IRQS; i++) {
1014                 struct irq_pin_list *entry = irq_2_pin + i;
1015                 if (entry->pin < 0)
1016                         continue;
1017                 printk(KERN_DEBUG "IRQ%d ", i);
1018                 for (;;) {
1019                         printk("-> %d:%d", entry->apic, entry->pin);
1020                         if (!entry->next)
1021                                 break;
1022                         entry = irq_2_pin + entry->next;
1023                 }
1024                 printk("\n");
1025         }
1026
1027         printk(KERN_INFO ".................................... done.\n");
1028
1029         return;
1030 }
1031
1032 #if 0
1033
1034 static __apicdebuginit void print_APIC_bitfield (int base)
1035 {
1036         unsigned int v;
1037         int i, j;
1038
1039         if (apic_verbosity == APIC_QUIET)
1040                 return;
1041
1042         printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1043         for (i = 0; i < 8; i++) {
1044                 v = apic_read(base + i*0x10);
1045                 for (j = 0; j < 32; j++) {
1046                         if (v & (1<<j))
1047                                 printk("1");
1048                         else
1049                                 printk("0");
1050                 }
1051                 printk("\n");
1052         }
1053 }
1054
1055 void __apicdebuginit print_local_APIC(void * dummy)
1056 {
1057         unsigned int v, ver, maxlvt;
1058
1059         if (apic_verbosity == APIC_QUIET)
1060                 return;
1061
1062         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1063                 smp_processor_id(), hard_smp_processor_id());
1064         v = apic_read(APIC_ID);
1065         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(v));
1066         v = apic_read(APIC_LVR);
1067         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1068         ver = GET_APIC_VERSION(v);
1069         maxlvt = get_maxlvt();
1070
1071         v = apic_read(APIC_TASKPRI);
1072         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1073
1074         v = apic_read(APIC_ARBPRI);
1075         printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1076                 v & APIC_ARBPRI_MASK);
1077         v = apic_read(APIC_PROCPRI);
1078         printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1079
1080         v = apic_read(APIC_EOI);
1081         printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1082         v = apic_read(APIC_RRR);
1083         printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1084         v = apic_read(APIC_LDR);
1085         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1086         v = apic_read(APIC_DFR);
1087         printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1088         v = apic_read(APIC_SPIV);
1089         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1090
1091         printk(KERN_DEBUG "... APIC ISR field:\n");
1092         print_APIC_bitfield(APIC_ISR);
1093         printk(KERN_DEBUG "... APIC TMR field:\n");
1094         print_APIC_bitfield(APIC_TMR);
1095         printk(KERN_DEBUG "... APIC IRR field:\n");
1096         print_APIC_bitfield(APIC_IRR);
1097
1098         v = apic_read(APIC_ESR);
1099         printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1100
1101         v = apic_read(APIC_ICR);
1102         printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1103         v = apic_read(APIC_ICR2);
1104         printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1105
1106         v = apic_read(APIC_LVTT);
1107         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1108
1109         if (maxlvt > 3) {                       /* PC is LVT#4. */
1110                 v = apic_read(APIC_LVTPC);
1111                 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1112         }
1113         v = apic_read(APIC_LVT0);
1114         printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1115         v = apic_read(APIC_LVT1);
1116         printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1117
1118         if (maxlvt > 2) {                       /* ERR is LVT#3. */
1119                 v = apic_read(APIC_LVTERR);
1120                 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1121         }
1122
1123         v = apic_read(APIC_TMICT);
1124         printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1125         v = apic_read(APIC_TMCCT);
1126         printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1127         v = apic_read(APIC_TDCR);
1128         printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1129         printk("\n");
1130 }
1131
1132 void print_all_local_APICs (void)
1133 {
1134         on_each_cpu(print_local_APIC, NULL, 1, 1);
1135 }
1136
1137 void __apicdebuginit print_PIC(void)
1138 {
1139         unsigned int v;
1140         unsigned long flags;
1141
1142         if (apic_verbosity == APIC_QUIET)
1143                 return;
1144
1145         printk(KERN_DEBUG "\nprinting PIC contents\n");
1146
1147         spin_lock_irqsave(&i8259A_lock, flags);
1148
1149         v = inb(0xa1) << 8 | inb(0x21);
1150         printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
1151
1152         v = inb(0xa0) << 8 | inb(0x20);
1153         printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
1154
1155         outb(0x0b,0xa0);
1156         outb(0x0b,0x20);
1157         v = inb(0xa0) << 8 | inb(0x20);
1158         outb(0x0a,0xa0);
1159         outb(0x0a,0x20);
1160
1161         spin_unlock_irqrestore(&i8259A_lock, flags);
1162
1163         printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
1164
1165         v = inb(0x4d1) << 8 | inb(0x4d0);
1166         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1167 }
1168
1169 #endif  /*  0  */
1170
1171 static void __init enable_IO_APIC(void)
1172 {
1173         union IO_APIC_reg_01 reg_01;
1174         int i8259_apic, i8259_pin;
1175         int i, apic;
1176         unsigned long flags;
1177
1178         for (i = 0; i < PIN_MAP_SIZE; i++) {
1179                 irq_2_pin[i].pin = -1;
1180                 irq_2_pin[i].next = 0;
1181         }
1182
1183         /*
1184          * The number of IO-APIC IRQ registers (== #pins):
1185          */
1186         for (apic = 0; apic < nr_ioapics; apic++) {
1187                 spin_lock_irqsave(&ioapic_lock, flags);
1188                 reg_01.raw = io_apic_read(apic, 1);
1189                 spin_unlock_irqrestore(&ioapic_lock, flags);
1190                 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1191         }
1192         for(apic = 0; apic < nr_ioapics; apic++) {
1193                 int pin;
1194                 /* See if any of the pins is in ExtINT mode */
1195                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1196                         struct IO_APIC_route_entry entry;
1197                         entry = ioapic_read_entry(apic, pin);
1198
1199                         /* If the interrupt line is enabled and in ExtInt mode
1200                          * I have found the pin where the i8259 is connected.
1201                          */
1202                         if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1203                                 ioapic_i8259.apic = apic;
1204                                 ioapic_i8259.pin  = pin;
1205                                 goto found_i8259;
1206                         }
1207                 }
1208         }
1209  found_i8259:
1210         /* Look to see what if the MP table has reported the ExtINT */
1211         i8259_pin  = find_isa_irq_pin(0, mp_ExtINT);
1212         i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1213         /* Trust the MP table if nothing is setup in the hardware */
1214         if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1215                 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1216                 ioapic_i8259.pin  = i8259_pin;
1217                 ioapic_i8259.apic = i8259_apic;
1218         }
1219         /* Complain if the MP table and the hardware disagree */
1220         if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1221                 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1222         {
1223                 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1224         }
1225
1226         /*
1227          * Do not trust the IO-APIC being empty at bootup
1228          */
1229         clear_IO_APIC();
1230 }
1231
1232 /*
1233  * Not an __init, needed by the reboot code
1234  */
1235 void disable_IO_APIC(void)
1236 {
1237         /*
1238          * Clear the IO-APIC before rebooting:
1239          */
1240         clear_IO_APIC();
1241
1242         /*
1243          * If the i8259 is routed through an IOAPIC
1244          * Put that IOAPIC in virtual wire mode
1245          * so legacy interrupts can be delivered.
1246          */
1247         if (ioapic_i8259.pin != -1) {
1248                 struct IO_APIC_route_entry entry;
1249
1250                 memset(&entry, 0, sizeof(entry));
1251                 entry.mask            = 0; /* Enabled */
1252                 entry.trigger         = 0; /* Edge */
1253                 entry.irr             = 0;
1254                 entry.polarity        = 0; /* High */
1255                 entry.delivery_status = 0;
1256                 entry.dest_mode       = 0; /* Physical */
1257                 entry.delivery_mode   = dest_ExtINT; /* ExtInt */
1258                 entry.vector          = 0;
1259                 entry.dest          = GET_APIC_ID(apic_read(APIC_ID));
1260
1261                 /*
1262                  * Add it to the IO-APIC irq-routing table:
1263                  */
1264                 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1265         }
1266
1267         disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1268 }
1269
1270 /*
1271  * There is a nasty bug in some older SMP boards, their mptable lies
1272  * about the timer IRQ. We do the following to work around the situation:
1273  *
1274  *      - timer IRQ defaults to IO-APIC IRQ
1275  *      - if this function detects that timer IRQs are defunct, then we fall
1276  *        back to ISA timer IRQs
1277  */
1278 static int __init timer_irq_works(void)
1279 {
1280         unsigned long t1 = jiffies;
1281
1282         local_irq_enable();
1283         /* Let ten ticks pass... */
1284         mdelay((10 * 1000) / HZ);
1285
1286         /*
1287          * Expect a few ticks at least, to be sure some possible
1288          * glue logic does not lock up after one or two first
1289          * ticks in a non-ExtINT mode.  Also the local APIC
1290          * might have cached one ExtINT interrupt.  Finally, at
1291          * least one tick may be lost due to delays.
1292          */
1293
1294         /* jiffies wrap? */
1295         if (jiffies - t1 > 4)
1296                 return 1;
1297         return 0;
1298 }
1299
1300 /*
1301  * In the SMP+IOAPIC case it might happen that there are an unspecified
1302  * number of pending IRQ events unhandled. These cases are very rare,
1303  * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1304  * better to do it this way as thus we do not have to be aware of
1305  * 'pending' interrupts in the IRQ path, except at this point.
1306  */
1307 /*
1308  * Edge triggered needs to resend any interrupt
1309  * that was delayed but this is now handled in the device
1310  * independent code.
1311  */
1312
1313 /*
1314  * Starting up a edge-triggered IO-APIC interrupt is
1315  * nasty - we need to make sure that we get the edge.
1316  * If it is already asserted for some reason, we need
1317  * return 1 to indicate that is was pending.
1318  *
1319  * This is not complete - we should be able to fake
1320  * an edge even if it isn't on the 8259A...
1321  */
1322
1323 static unsigned int startup_ioapic_irq(unsigned int irq)
1324 {
1325         int was_pending = 0;
1326         unsigned long flags;
1327
1328         spin_lock_irqsave(&ioapic_lock, flags);
1329         if (irq < 16) {
1330                 disable_8259A_irq(irq);
1331                 if (i8259A_irq_pending(irq))
1332                         was_pending = 1;
1333         }
1334         __unmask_IO_APIC_irq(irq);
1335         spin_unlock_irqrestore(&ioapic_lock, flags);
1336
1337         return was_pending;
1338 }
1339
1340 static int ioapic_retrigger_irq(unsigned int irq)
1341 {
1342         struct irq_cfg *cfg = &irq_cfg[irq];
1343         cpumask_t mask;
1344         unsigned long flags;
1345
1346         spin_lock_irqsave(&vector_lock, flags);
1347         cpus_clear(mask);
1348         cpu_set(first_cpu(cfg->domain), mask);
1349
1350         send_IPI_mask(mask, cfg->vector);
1351         spin_unlock_irqrestore(&vector_lock, flags);
1352
1353         return 1;
1354 }
1355
1356 /*
1357  * Level and edge triggered IO-APIC interrupts need different handling,
1358  * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1359  * handled with the level-triggered descriptor, but that one has slightly
1360  * more overhead. Level-triggered interrupts cannot be handled with the
1361  * edge-triggered handler, without risking IRQ storms and other ugly
1362  * races.
1363  */
1364
1365 #ifdef CONFIG_SMP
1366 asmlinkage void smp_irq_move_cleanup_interrupt(void)
1367 {
1368         unsigned vector, me;
1369         ack_APIC_irq();
1370         exit_idle();
1371         irq_enter();
1372
1373         me = smp_processor_id();
1374         for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
1375                 unsigned int irq;
1376                 struct irq_desc *desc;
1377                 struct irq_cfg *cfg;
1378                 irq = __get_cpu_var(vector_irq)[vector];
1379                 if (irq >= NR_IRQS)
1380                         continue;
1381
1382                 desc = irq_desc + irq;
1383                 cfg = irq_cfg + irq;
1384                 spin_lock(&desc->lock);
1385                 if (!cfg->move_cleanup_count)
1386                         goto unlock;
1387
1388                 if ((vector == cfg->vector) && cpu_isset(me, cfg->domain))
1389                         goto unlock;
1390
1391                 __get_cpu_var(vector_irq)[vector] = -1;
1392                 cfg->move_cleanup_count--;
1393 unlock:
1394                 spin_unlock(&desc->lock);
1395         }
1396
1397         irq_exit();
1398 }
1399
1400 static void irq_complete_move(unsigned int irq)
1401 {
1402         struct irq_cfg *cfg = irq_cfg + irq;
1403         unsigned vector, me;
1404
1405         if (likely(!cfg->move_in_progress))
1406                 return;
1407
1408         vector = ~get_irq_regs()->orig_rax;
1409         me = smp_processor_id();
1410         if ((vector == cfg->vector) &&
1411             cpu_isset(smp_processor_id(), cfg->domain)) {
1412                 cpumask_t cleanup_mask;
1413
1414                 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
1415                 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
1416                 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
1417                 cfg->move_in_progress = 0;
1418         }
1419 }
1420 #else
1421 static inline void irq_complete_move(unsigned int irq) {}
1422 #endif
1423
1424 static void ack_apic_edge(unsigned int irq)
1425 {
1426         irq_complete_move(irq);
1427         move_native_irq(irq);
1428         ack_APIC_irq();
1429 }
1430
1431 static void ack_apic_level(unsigned int irq)
1432 {
1433         int do_unmask_irq = 0;
1434
1435         irq_complete_move(irq);
1436 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
1437         /* If we are moving the irq we need to mask it */
1438         if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
1439                 do_unmask_irq = 1;
1440                 mask_IO_APIC_irq(irq);
1441         }
1442 #endif
1443
1444         /*
1445          * We must acknowledge the irq before we move it or the acknowledge will
1446          * not propogate properly.
1447          */
1448         ack_APIC_irq();
1449
1450         /* Now we can move and renable the irq */
1451         move_masked_irq(irq);
1452         if (unlikely(do_unmask_irq))
1453                 unmask_IO_APIC_irq(irq);
1454 }
1455
1456 static struct irq_chip ioapic_chip __read_mostly = {
1457         .name           = "IO-APIC",
1458         .startup        = startup_ioapic_irq,
1459         .mask           = mask_IO_APIC_irq,
1460         .unmask         = unmask_IO_APIC_irq,
1461         .ack            = ack_apic_edge,
1462         .eoi            = ack_apic_level,
1463 #ifdef CONFIG_SMP
1464         .set_affinity   = set_ioapic_affinity_irq,
1465 #endif
1466         .retrigger      = ioapic_retrigger_irq,
1467 };
1468
1469 static inline void init_IO_APIC_traps(void)
1470 {
1471         int irq;
1472
1473         /*
1474          * NOTE! The local APIC isn't very good at handling
1475          * multiple interrupts at the same interrupt level.
1476          * As the interrupt level is determined by taking the
1477          * vector number and shifting that right by 4, we
1478          * want to spread these out a bit so that they don't
1479          * all fall in the same interrupt level.
1480          *
1481          * Also, we've got to be careful not to trash gate
1482          * 0x80, because int 0x80 is hm, kind of importantish. ;)
1483          */
1484         for (irq = 0; irq < NR_IRQS ; irq++) {
1485                 int tmp = irq;
1486                 if (IO_APIC_IRQ(tmp) && !irq_cfg[tmp].vector) {
1487                         /*
1488                          * Hmm.. We don't have an entry for this,
1489                          * so default to an old-fashioned 8259
1490                          * interrupt if we can..
1491                          */
1492                         if (irq < 16)
1493                                 make_8259A_irq(irq);
1494                         else
1495                                 /* Strange. Oh, well.. */
1496                                 irq_desc[irq].chip = &no_irq_chip;
1497                 }
1498         }
1499 }
1500
1501 static void enable_lapic_irq (unsigned int irq)
1502 {
1503         unsigned long v;
1504
1505         v = apic_read(APIC_LVT0);
1506         apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1507 }
1508
1509 static void disable_lapic_irq (unsigned int irq)
1510 {
1511         unsigned long v;
1512
1513         v = apic_read(APIC_LVT0);
1514         apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1515 }
1516
1517 static void ack_lapic_irq (unsigned int irq)
1518 {
1519         ack_APIC_irq();
1520 }
1521
1522 static void end_lapic_irq (unsigned int i) { /* nothing */ }
1523
1524 static struct hw_interrupt_type lapic_irq_type __read_mostly = {
1525         .typename = "local-APIC-edge",
1526         .startup = NULL, /* startup_irq() not used for IRQ0 */
1527         .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
1528         .enable = enable_lapic_irq,
1529         .disable = disable_lapic_irq,
1530         .ack = ack_lapic_irq,
1531         .end = end_lapic_irq,
1532 };
1533
1534 static void setup_nmi (void)
1535 {
1536         /*
1537          * Dirty trick to enable the NMI watchdog ...
1538          * We put the 8259A master into AEOI mode and
1539          * unmask on all local APICs LVT0 as NMI.
1540          *
1541          * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1542          * is from Maciej W. Rozycki - so we do not have to EOI from
1543          * the NMI handler or the timer interrupt.
1544          */ 
1545         printk(KERN_INFO "activating NMI Watchdog ...");
1546
1547         enable_NMI_through_LVT0(NULL);
1548
1549         printk(" done.\n");
1550 }
1551
1552 /*
1553  * This looks a bit hackish but it's about the only one way of sending
1554  * a few INTA cycles to 8259As and any associated glue logic.  ICR does
1555  * not support the ExtINT mode, unfortunately.  We need to send these
1556  * cycles as some i82489DX-based boards have glue logic that keeps the
1557  * 8259A interrupt line asserted until INTA.  --macro
1558  */
1559 static inline void unlock_ExtINT_logic(void)
1560 {
1561         int apic, pin, i;
1562         struct IO_APIC_route_entry entry0, entry1;
1563         unsigned char save_control, save_freq_select;
1564         unsigned long flags;
1565
1566         pin  = find_isa_irq_pin(8, mp_INT);
1567         apic = find_isa_irq_apic(8, mp_INT);
1568         if (pin == -1)
1569                 return;
1570
1571         spin_lock_irqsave(&ioapic_lock, flags);
1572         *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
1573         *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
1574         spin_unlock_irqrestore(&ioapic_lock, flags);
1575         clear_IO_APIC_pin(apic, pin);
1576
1577         memset(&entry1, 0, sizeof(entry1));
1578
1579         entry1.dest_mode = 0;                   /* physical delivery */
1580         entry1.mask = 0;                        /* unmask IRQ now */
1581         entry1.dest = hard_smp_processor_id();
1582         entry1.delivery_mode = dest_ExtINT;
1583         entry1.polarity = entry0.polarity;
1584         entry1.trigger = 0;
1585         entry1.vector = 0;
1586
1587         spin_lock_irqsave(&ioapic_lock, flags);
1588         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
1589         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
1590         spin_unlock_irqrestore(&ioapic_lock, flags);
1591
1592         save_control = CMOS_READ(RTC_CONTROL);
1593         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1594         CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
1595                    RTC_FREQ_SELECT);
1596         CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
1597
1598         i = 100;
1599         while (i-- > 0) {
1600                 mdelay(10);
1601                 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
1602                         i -= 10;
1603         }
1604
1605         CMOS_WRITE(save_control, RTC_CONTROL);
1606         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1607         clear_IO_APIC_pin(apic, pin);
1608
1609         spin_lock_irqsave(&ioapic_lock, flags);
1610         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
1611         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
1612         spin_unlock_irqrestore(&ioapic_lock, flags);
1613 }
1614
1615 /*
1616  * This code may look a bit paranoid, but it's supposed to cooperate with
1617  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
1618  * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
1619  * fanatically on his truly buggy board.
1620  *
1621  * FIXME: really need to revamp this for modern platforms only.
1622  */
1623 static inline void check_timer(void)
1624 {
1625         struct irq_cfg *cfg = irq_cfg + 0;
1626         int apic1, pin1, apic2, pin2;
1627
1628         /*
1629          * get/set the timer IRQ vector:
1630          */
1631         disable_8259A_irq(0);
1632         assign_irq_vector(0, TARGET_CPUS);
1633
1634         /*
1635          * Subtle, code in do_timer_interrupt() expects an AEOI
1636          * mode for the 8259A whenever interrupts are routed
1637          * through I/O APICs.  Also IRQ0 has to be enabled in
1638          * the 8259A which implies the virtual wire has to be
1639          * disabled in the local APIC.
1640          */
1641         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1642         init_8259A(1);
1643         if (timer_over_8254 > 0)
1644                 enable_8259A_irq(0);
1645
1646         pin1  = find_isa_irq_pin(0, mp_INT);
1647         apic1 = find_isa_irq_apic(0, mp_INT);
1648         pin2  = ioapic_i8259.pin;
1649         apic2 = ioapic_i8259.apic;
1650
1651         apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
1652                 cfg->vector, apic1, pin1, apic2, pin2);
1653
1654         if (pin1 != -1) {
1655                 /*
1656                  * Ok, does IRQ0 through the IOAPIC work?
1657                  */
1658                 unmask_IO_APIC_irq(0);
1659                 if (!no_timer_check && timer_irq_works()) {
1660                         nmi_watchdog_default();
1661                         if (nmi_watchdog == NMI_IO_APIC) {
1662                                 disable_8259A_irq(0);
1663                                 setup_nmi();
1664                                 enable_8259A_irq(0);
1665                         }
1666                         if (disable_timer_pin_1 > 0)
1667                                 clear_IO_APIC_pin(0, pin1);
1668                         return;
1669                 }
1670                 clear_IO_APIC_pin(apic1, pin1);
1671                 apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
1672                                 "connected to IO-APIC\n");
1673         }
1674
1675         apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
1676                                 "through the 8259A ... ");
1677         if (pin2 != -1) {
1678                 apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
1679                         apic2, pin2);
1680                 /*
1681                  * legacy devices should be connected to IO APIC #0
1682                  */
1683                 setup_ExtINT_IRQ0_pin(apic2, pin2, cfg->vector);
1684                 if (timer_irq_works()) {
1685                         apic_printk(APIC_VERBOSE," works.\n");
1686                         nmi_watchdog_default();
1687                         if (nmi_watchdog == NMI_IO_APIC) {
1688                                 setup_nmi();
1689                         }
1690                         return;
1691                 }
1692                 /*
1693                  * Cleanup, just in case ...
1694                  */
1695                 clear_IO_APIC_pin(apic2, pin2);
1696         }
1697         apic_printk(APIC_VERBOSE," failed.\n");
1698
1699         if (nmi_watchdog == NMI_IO_APIC) {
1700                 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1701                 nmi_watchdog = 0;
1702         }
1703
1704         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
1705
1706         disable_8259A_irq(0);
1707         irq_desc[0].chip = &lapic_irq_type;
1708         apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector);     /* Fixed mode */
1709         enable_8259A_irq(0);
1710
1711         if (timer_irq_works()) {
1712                 apic_printk(APIC_VERBOSE," works.\n");
1713                 return;
1714         }
1715         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
1716         apic_printk(APIC_VERBOSE," failed.\n");
1717
1718         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
1719
1720         init_8259A(0);
1721         make_8259A_irq(0);
1722         apic_write(APIC_LVT0, APIC_DM_EXTINT);
1723
1724         unlock_ExtINT_logic();
1725
1726         if (timer_irq_works()) {
1727                 apic_printk(APIC_VERBOSE," works.\n");
1728                 return;
1729         }
1730         apic_printk(APIC_VERBOSE," failed :(.\n");
1731         panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1732 }
1733
1734 static int __init notimercheck(char *s)
1735 {
1736         no_timer_check = 1;
1737         return 1;
1738 }
1739 __setup("no_timer_check", notimercheck);
1740
1741 /*
1742  *
1743  * IRQ's that are handled by the PIC in the MPS IOAPIC case.
1744  * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1745  *   Linux doesn't really care, as it's not actually used
1746  *   for any interrupt handling anyway.
1747  */
1748 #define PIC_IRQS        (1<<2)
1749
1750 void __init setup_IO_APIC(void)
1751 {
1752         enable_IO_APIC();
1753
1754         if (acpi_ioapic)
1755                 io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
1756         else
1757                 io_apic_irqs = ~PIC_IRQS;
1758
1759         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
1760
1761         sync_Arb_IDs();
1762         setup_IO_APIC_irqs();
1763         init_IO_APIC_traps();
1764         check_timer();
1765         if (!acpi_ioapic)
1766                 print_IO_APIC();
1767 }
1768
1769 struct sysfs_ioapic_data {
1770         struct sys_device dev;
1771         struct IO_APIC_route_entry entry[0];
1772 };
1773 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
1774
1775 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
1776 {
1777         struct IO_APIC_route_entry *entry;
1778         struct sysfs_ioapic_data *data;
1779         int i;
1780
1781         data = container_of(dev, struct sysfs_ioapic_data, dev);
1782         entry = data->entry;
1783         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
1784                 *entry = ioapic_read_entry(dev->id, i);
1785
1786         return 0;
1787 }
1788
1789 static int ioapic_resume(struct sys_device *dev)
1790 {
1791         struct IO_APIC_route_entry *entry;
1792         struct sysfs_ioapic_data *data;
1793         unsigned long flags;
1794         union IO_APIC_reg_00 reg_00;
1795         int i;
1796
1797         data = container_of(dev, struct sysfs_ioapic_data, dev);
1798         entry = data->entry;
1799
1800         spin_lock_irqsave(&ioapic_lock, flags);
1801         reg_00.raw = io_apic_read(dev->id, 0);
1802         if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
1803                 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
1804                 io_apic_write(dev->id, 0, reg_00.raw);
1805         }
1806         spin_unlock_irqrestore(&ioapic_lock, flags);
1807         for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
1808                 ioapic_write_entry(dev->id, i, entry[i]);
1809
1810         return 0;
1811 }
1812
1813 static struct sysdev_class ioapic_sysdev_class = {
1814         set_kset_name("ioapic"),
1815         .suspend = ioapic_suspend,
1816         .resume = ioapic_resume,
1817 };
1818
1819 static int __init ioapic_init_sysfs(void)
1820 {
1821         struct sys_device * dev;
1822         int i, size, error = 0;
1823
1824         error = sysdev_class_register(&ioapic_sysdev_class);
1825         if (error)
1826                 return error;
1827
1828         for (i = 0; i < nr_ioapics; i++ ) {
1829                 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
1830                         * sizeof(struct IO_APIC_route_entry);
1831                 mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
1832                 if (!mp_ioapic_data[i]) {
1833                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1834                         continue;
1835                 }
1836                 memset(mp_ioapic_data[i], 0, size);
1837                 dev = &mp_ioapic_data[i]->dev;
1838                 dev->id = i;
1839                 dev->cls = &ioapic_sysdev_class;
1840                 error = sysdev_register(dev);
1841                 if (error) {
1842                         kfree(mp_ioapic_data[i]);
1843                         mp_ioapic_data[i] = NULL;
1844                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1845                         continue;
1846                 }
1847         }
1848
1849         return 0;
1850 }
1851
1852 device_initcall(ioapic_init_sysfs);
1853
1854 /*
1855  * Dynamic irq allocate and deallocation
1856  */
1857 int create_irq(void)
1858 {
1859         /* Allocate an unused irq */
1860         int irq;
1861         int new;
1862         unsigned long flags;
1863
1864         irq = -ENOSPC;
1865         spin_lock_irqsave(&vector_lock, flags);
1866         for (new = (NR_IRQS - 1); new >= 0; new--) {
1867                 if (platform_legacy_irq(new))
1868                         continue;
1869                 if (irq_cfg[new].vector != 0)
1870                         continue;
1871                 if (__assign_irq_vector(new, TARGET_CPUS) == 0)
1872                         irq = new;
1873                 break;
1874         }
1875         spin_unlock_irqrestore(&vector_lock, flags);
1876
1877         if (irq >= 0) {
1878                 dynamic_irq_init(irq);
1879         }
1880         return irq;
1881 }
1882
1883 void destroy_irq(unsigned int irq)
1884 {
1885         unsigned long flags;
1886
1887         dynamic_irq_cleanup(irq);
1888
1889         spin_lock_irqsave(&vector_lock, flags);
1890         __clear_irq_vector(irq);
1891         spin_unlock_irqrestore(&vector_lock, flags);
1892 }
1893
1894 /*
1895  * MSI mesage composition
1896  */
1897 #ifdef CONFIG_PCI_MSI
1898 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
1899 {
1900         struct irq_cfg *cfg = irq_cfg + irq;
1901         int err;
1902         unsigned dest;
1903         cpumask_t tmp;
1904
1905         tmp = TARGET_CPUS;
1906         err = assign_irq_vector(irq, tmp);
1907         if (!err) {
1908                 cpus_and(tmp, cfg->domain, tmp);
1909                 dest = cpu_mask_to_apicid(tmp);
1910
1911                 msg->address_hi = MSI_ADDR_BASE_HI;
1912                 msg->address_lo =
1913                         MSI_ADDR_BASE_LO |
1914                         ((INT_DEST_MODE == 0) ?
1915                                 MSI_ADDR_DEST_MODE_PHYSICAL:
1916                                 MSI_ADDR_DEST_MODE_LOGICAL) |
1917                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1918                                 MSI_ADDR_REDIRECTION_CPU:
1919                                 MSI_ADDR_REDIRECTION_LOWPRI) |
1920                         MSI_ADDR_DEST_ID(dest);
1921
1922                 msg->data =
1923                         MSI_DATA_TRIGGER_EDGE |
1924                         MSI_DATA_LEVEL_ASSERT |
1925                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1926                                 MSI_DATA_DELIVERY_FIXED:
1927                                 MSI_DATA_DELIVERY_LOWPRI) |
1928                         MSI_DATA_VECTOR(cfg->vector);
1929         }
1930         return err;
1931 }
1932
1933 #ifdef CONFIG_SMP
1934 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
1935 {
1936         struct irq_cfg *cfg = irq_cfg + irq;
1937         struct msi_msg msg;
1938         unsigned int dest;
1939         cpumask_t tmp;
1940
1941         cpus_and(tmp, mask, cpu_online_map);
1942         if (cpus_empty(tmp))
1943                 return;
1944
1945         if (assign_irq_vector(irq, mask))
1946                 return;
1947
1948         cpus_and(tmp, cfg->domain, mask);
1949         dest = cpu_mask_to_apicid(tmp);
1950
1951         read_msi_msg(irq, &msg);
1952
1953         msg.data &= ~MSI_DATA_VECTOR_MASK;
1954         msg.data |= MSI_DATA_VECTOR(cfg->vector);
1955         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
1956         msg.address_lo |= MSI_ADDR_DEST_ID(dest);
1957
1958         write_msi_msg(irq, &msg);
1959         irq_desc[irq].affinity = mask;
1960 }
1961 #endif /* CONFIG_SMP */
1962
1963 /*
1964  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
1965  * which implement the MSI or MSI-X Capability Structure.
1966  */
1967 static struct irq_chip msi_chip = {
1968         .name           = "PCI-MSI",
1969         .unmask         = unmask_msi_irq,
1970         .mask           = mask_msi_irq,
1971         .ack            = ack_apic_edge,
1972 #ifdef CONFIG_SMP
1973         .set_affinity   = set_msi_irq_affinity,
1974 #endif
1975         .retrigger      = ioapic_retrigger_irq,
1976 };
1977
1978 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
1979 {
1980         struct msi_msg msg;
1981         int irq, ret;
1982         irq = create_irq();
1983         if (irq < 0)
1984                 return irq;
1985
1986         ret = msi_compose_msg(dev, irq, &msg);
1987         if (ret < 0) {
1988                 destroy_irq(irq);
1989                 return ret;
1990         }
1991
1992         set_irq_msi(irq, desc);
1993         write_msi_msg(irq, &msg);
1994
1995         set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
1996
1997         return 0;
1998 }
1999
2000 void arch_teardown_msi_irq(unsigned int irq)
2001 {
2002         destroy_irq(irq);
2003 }
2004
2005 #endif /* CONFIG_PCI_MSI */
2006
2007 /*
2008  * Hypertransport interrupt support
2009  */
2010 #ifdef CONFIG_HT_IRQ
2011
2012 #ifdef CONFIG_SMP
2013
2014 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
2015 {
2016         struct ht_irq_msg msg;
2017         fetch_ht_irq_msg(irq, &msg);
2018
2019         msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
2020         msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
2021
2022         msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
2023         msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
2024
2025         write_ht_irq_msg(irq, &msg);
2026 }
2027
2028 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2029 {
2030         struct irq_cfg *cfg = irq_cfg + irq;
2031         unsigned int dest;
2032         cpumask_t tmp;
2033
2034         cpus_and(tmp, mask, cpu_online_map);
2035         if (cpus_empty(tmp))
2036                 return;
2037
2038         if (assign_irq_vector(irq, mask))
2039                 return;
2040
2041         cpus_and(tmp, cfg->domain, mask);
2042         dest = cpu_mask_to_apicid(tmp);
2043
2044         target_ht_irq(irq, dest, cfg->vector);
2045         irq_desc[irq].affinity = mask;
2046 }
2047 #endif
2048
2049 static struct irq_chip ht_irq_chip = {
2050         .name           = "PCI-HT",
2051         .mask           = mask_ht_irq,
2052         .unmask         = unmask_ht_irq,
2053         .ack            = ack_apic_edge,
2054 #ifdef CONFIG_SMP
2055         .set_affinity   = set_ht_irq_affinity,
2056 #endif
2057         .retrigger      = ioapic_retrigger_irq,
2058 };
2059
2060 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2061 {
2062         struct irq_cfg *cfg = irq_cfg + irq;
2063         int err;
2064         cpumask_t tmp;
2065
2066         tmp = TARGET_CPUS;
2067         err = assign_irq_vector(irq, tmp);
2068         if (!err) {
2069                 struct ht_irq_msg msg;
2070                 unsigned dest;
2071
2072                 cpus_and(tmp, cfg->domain, tmp);
2073                 dest = cpu_mask_to_apicid(tmp);
2074
2075                 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
2076
2077                 msg.address_lo =
2078                         HT_IRQ_LOW_BASE |
2079                         HT_IRQ_LOW_DEST_ID(dest) |
2080                         HT_IRQ_LOW_VECTOR(cfg->vector) |
2081                         ((INT_DEST_MODE == 0) ?
2082                                 HT_IRQ_LOW_DM_PHYSICAL :
2083                                 HT_IRQ_LOW_DM_LOGICAL) |
2084                         HT_IRQ_LOW_RQEOI_EDGE |
2085                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2086                                 HT_IRQ_LOW_MT_FIXED :
2087                                 HT_IRQ_LOW_MT_ARBITRATED) |
2088                         HT_IRQ_LOW_IRQ_MASKED;
2089
2090                 write_ht_irq_msg(irq, &msg);
2091
2092                 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2093                                               handle_edge_irq, "edge");
2094         }
2095         return err;
2096 }
2097 #endif /* CONFIG_HT_IRQ */
2098
2099 /* --------------------------------------------------------------------------
2100                           ACPI-based IOAPIC Configuration
2101    -------------------------------------------------------------------------- */
2102
2103 #ifdef CONFIG_ACPI
2104
2105 #define IO_APIC_MAX_ID          0xFE
2106
2107 int __init io_apic_get_redir_entries (int ioapic)
2108 {
2109         union IO_APIC_reg_01    reg_01;
2110         unsigned long flags;
2111
2112         spin_lock_irqsave(&ioapic_lock, flags);
2113         reg_01.raw = io_apic_read(ioapic, 1);
2114         spin_unlock_irqrestore(&ioapic_lock, flags);
2115
2116         return reg_01.bits.entries;
2117 }
2118
2119
2120 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
2121 {
2122         if (!IO_APIC_IRQ(irq)) {
2123                 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2124                         ioapic);
2125                 return -EINVAL;
2126         }
2127
2128         /*
2129          * IRQs < 16 are already in the irq_2_pin[] map
2130          */
2131         if (irq >= 16)
2132                 add_pin_to_irq(irq, ioapic, pin);
2133
2134         setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
2135
2136         return 0;
2137 }
2138
2139 #endif /* CONFIG_ACPI */
2140
2141
2142 /*
2143  * This function currently is only a helper for the i386 smp boot process where
2144  * we need to reprogram the ioredtbls to cater for the cpus which have come online
2145  * so mask in all cases should simply be TARGET_CPUS
2146  */
2147 #ifdef CONFIG_SMP
2148 void __init setup_ioapic_dest(void)
2149 {
2150         int pin, ioapic, irq, irq_entry;
2151
2152         if (skip_ioapic_setup == 1)
2153                 return;
2154
2155         for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
2156                 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
2157                         irq_entry = find_irq_entry(ioapic, pin, mp_INT);
2158                         if (irq_entry == -1)
2159                                 continue;
2160                         irq = pin_2_irq(irq_entry, ioapic, pin);
2161
2162                         /* setup_IO_APIC_irqs could fail to get vector for some device
2163                          * when you have too many devices, because at that time only boot
2164                          * cpu is online.
2165                          */
2166                         if (!irq_cfg[irq].vector)
2167                                 setup_IO_APIC_irq(ioapic, pin, irq,
2168                                                   irq_trigger(irq_entry),
2169                                                   irq_polarity(irq_entry));
2170                         else
2171                                 set_ioapic_affinity_irq(irq, TARGET_CPUS);
2172                 }
2173
2174         }
2175 }
2176 #endif