[PATCH] x86_64 irq: Kill declaration of removed array, interrupt
[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 static int assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result);
51
52 #define __apicdebuginit  __init
53
54 int sis_apic_bug; /* not actually supported, dummy for compile */
55
56 static int no_timer_check;
57
58 static int disable_timer_pin_1 __initdata;
59
60 int timer_over_8254 __initdata = 1;
61
62 /* Where if anywhere is the i8259 connect in external int mode */
63 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
64
65 static DEFINE_SPINLOCK(ioapic_lock);
66 DEFINE_SPINLOCK(vector_lock);
67
68 /*
69  * # of IRQ routing registers
70  */
71 int nr_ioapic_registers[MAX_IO_APICS];
72
73 /*
74  * Rough estimation of how many shared IRQs there are, can
75  * be changed anytime.
76  */
77 #define MAX_PLUS_SHARED_IRQS NR_IRQ_VECTORS
78 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
79
80 /*
81  * This is performance-critical, we want to do it O(1)
82  *
83  * the indexing order of this array favors 1:1 mappings
84  * between pins and IRQs.
85  */
86
87 static struct irq_pin_list {
88         short apic, pin, next;
89 } irq_2_pin[PIN_MAP_SIZE];
90
91 struct io_apic {
92         unsigned int index;
93         unsigned int unused[3];
94         unsigned int data;
95 };
96
97 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
98 {
99         return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
100                 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
101 }
102
103 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
104 {
105         struct io_apic __iomem *io_apic = io_apic_base(apic);
106         writel(reg, &io_apic->index);
107         return readl(&io_apic->data);
108 }
109
110 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
111 {
112         struct io_apic __iomem *io_apic = io_apic_base(apic);
113         writel(reg, &io_apic->index);
114         writel(value, &io_apic->data);
115 }
116
117 /*
118  * Re-write a value: to be used for read-modify-write
119  * cycles where the read already set up the index register.
120  */
121 static inline void io_apic_modify(unsigned int apic, unsigned int value)
122 {
123         struct io_apic __iomem *io_apic = io_apic_base(apic);
124         writel(value, &io_apic->data);
125 }
126
127 /*
128  * Synchronize the IO-APIC and the CPU by doing
129  * a dummy read from the IO-APIC
130  */
131 static inline void io_apic_sync(unsigned int apic)
132 {
133         struct io_apic __iomem *io_apic = io_apic_base(apic);
134         readl(&io_apic->data);
135 }
136
137 #define __DO_ACTION(R, ACTION, FINAL)                                   \
138                                                                         \
139 {                                                                       \
140         int pin;                                                        \
141         struct irq_pin_list *entry = irq_2_pin + irq;                   \
142                                                                         \
143         BUG_ON(irq >= NR_IRQS);                                         \
144         for (;;) {                                                      \
145                 unsigned int reg;                                       \
146                 pin = entry->pin;                                       \
147                 if (pin == -1)                                          \
148                         break;                                          \
149                 reg = io_apic_read(entry->apic, 0x10 + R + pin*2);      \
150                 reg ACTION;                                             \
151                 io_apic_modify(entry->apic, reg);                       \
152                 if (!entry->next)                                       \
153                         break;                                          \
154                 entry = irq_2_pin + entry->next;                        \
155         }                                                               \
156         FINAL;                                                          \
157 }
158
159 union entry_union {
160         struct { u32 w1, w2; };
161         struct IO_APIC_route_entry entry;
162 };
163
164 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
165 {
166         union entry_union eu;
167         unsigned long flags;
168         spin_lock_irqsave(&ioapic_lock, flags);
169         eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
170         eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
171         spin_unlock_irqrestore(&ioapic_lock, flags);
172         return eu.entry;
173 }
174
175 /*
176  * When we write a new IO APIC routing entry, we need to write the high
177  * word first! If the mask bit in the low word is clear, we will enable
178  * the interrupt, and we need to make sure the entry is fully populated
179  * before that happens.
180  */
181 static void
182 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
183 {
184         union entry_union eu;
185         eu.entry = e;
186         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
187         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
188 }
189
190 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
191 {
192         unsigned long flags;
193         spin_lock_irqsave(&ioapic_lock, flags);
194         __ioapic_write_entry(apic, pin, e);
195         spin_unlock_irqrestore(&ioapic_lock, flags);
196 }
197
198 /*
199  * When we mask an IO APIC routing entry, we need to write the low
200  * word first, in order to set the mask bit before we change the
201  * high bits!
202  */
203 static void ioapic_mask_entry(int apic, int pin)
204 {
205         unsigned long flags;
206         union entry_union eu = { .entry.mask = 1 };
207
208         spin_lock_irqsave(&ioapic_lock, flags);
209         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
210         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
211         spin_unlock_irqrestore(&ioapic_lock, flags);
212 }
213
214 #ifdef CONFIG_SMP
215 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
216 {
217         int apic, pin;
218         struct irq_pin_list *entry = irq_2_pin + irq;
219
220         BUG_ON(irq >= NR_IRQS);
221         for (;;) {
222                 unsigned int reg;
223                 apic = entry->apic;
224                 pin = entry->pin;
225                 if (pin == -1)
226                         break;
227                 io_apic_write(apic, 0x11 + pin*2, dest);
228                 reg = io_apic_read(apic, 0x10 + pin*2);
229                 reg &= ~0x000000ff;
230                 reg |= vector;
231                 io_apic_modify(apic, reg);
232                 if (!entry->next)
233                         break;
234                 entry = irq_2_pin + entry->next;
235         }
236 }
237
238 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
239 {
240         unsigned long flags;
241         unsigned int dest;
242         cpumask_t tmp;
243         int vector;
244
245         cpus_and(tmp, mask, cpu_online_map);
246         if (cpus_empty(tmp))
247                 tmp = TARGET_CPUS;
248
249         cpus_and(mask, tmp, CPU_MASK_ALL);
250
251         vector = assign_irq_vector(irq, mask, &tmp);
252         if (vector < 0)
253                 return;
254
255         dest = cpu_mask_to_apicid(tmp);
256
257         /*
258          * Only the high 8 bits are valid.
259          */
260         dest = SET_APIC_LOGICAL_ID(dest);
261
262         spin_lock_irqsave(&ioapic_lock, flags);
263         __target_IO_APIC_irq(irq, dest, vector);
264         irq_desc[irq].affinity = mask;
265         spin_unlock_irqrestore(&ioapic_lock, flags);
266 }
267 #endif
268
269 /*
270  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
271  * shared ISA-space IRQs, so we have to support them. We are super
272  * fast in the common case, and fast for shared ISA-space IRQs.
273  */
274 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
275 {
276         static int first_free_entry = NR_IRQS;
277         struct irq_pin_list *entry = irq_2_pin + irq;
278
279         BUG_ON(irq >= NR_IRQS);
280         while (entry->next)
281                 entry = irq_2_pin + entry->next;
282
283         if (entry->pin != -1) {
284                 entry->next = first_free_entry;
285                 entry = irq_2_pin + entry->next;
286                 if (++first_free_entry >= PIN_MAP_SIZE)
287                         panic("io_apic.c: ran out of irq_2_pin entries!");
288         }
289         entry->apic = apic;
290         entry->pin = pin;
291 }
292
293
294 #define DO_ACTION(name,R,ACTION, FINAL)                                 \
295                                                                         \
296         static void name##_IO_APIC_irq (unsigned int irq)               \
297         __DO_ACTION(R, ACTION, FINAL)
298
299 DO_ACTION( __mask,             0, |= 0x00010000, io_apic_sync(entry->apic) )
300                                                 /* mask = 1 */
301 DO_ACTION( __unmask,           0, &= 0xfffeffff, )
302                                                 /* mask = 0 */
303
304 static void mask_IO_APIC_irq (unsigned int irq)
305 {
306         unsigned long flags;
307
308         spin_lock_irqsave(&ioapic_lock, flags);
309         __mask_IO_APIC_irq(irq);
310         spin_unlock_irqrestore(&ioapic_lock, flags);
311 }
312
313 static void unmask_IO_APIC_irq (unsigned int irq)
314 {
315         unsigned long flags;
316
317         spin_lock_irqsave(&ioapic_lock, flags);
318         __unmask_IO_APIC_irq(irq);
319         spin_unlock_irqrestore(&ioapic_lock, flags);
320 }
321
322 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
323 {
324         struct IO_APIC_route_entry entry;
325
326         /* Check delivery_mode to be sure we're not clearing an SMI pin */
327         entry = ioapic_read_entry(apic, pin);
328         if (entry.delivery_mode == dest_SMI)
329                 return;
330         /*
331          * Disable it in the IO-APIC irq-routing table:
332          */
333         ioapic_mask_entry(apic, pin);
334 }
335
336 static void clear_IO_APIC (void)
337 {
338         int apic, pin;
339
340         for (apic = 0; apic < nr_ioapics; apic++)
341                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
342                         clear_IO_APIC_pin(apic, pin);
343 }
344
345 int skip_ioapic_setup;
346 int ioapic_force;
347
348 /* dummy parsing: see setup.c */
349
350 static int __init disable_ioapic_setup(char *str)
351 {
352         skip_ioapic_setup = 1;
353         return 0;
354 }
355 early_param("noapic", disable_ioapic_setup);
356
357 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
358 static int __init disable_timer_pin_setup(char *arg)
359 {
360         disable_timer_pin_1 = 1;
361         return 1;
362 }
363 __setup("disable_timer_pin_1", disable_timer_pin_setup);
364
365 static int __init setup_disable_8254_timer(char *s)
366 {
367         timer_over_8254 = -1;
368         return 1;
369 }
370 static int __init setup_enable_8254_timer(char *s)
371 {
372         timer_over_8254 = 2;
373         return 1;
374 }
375
376 __setup("disable_8254_timer", setup_disable_8254_timer);
377 __setup("enable_8254_timer", setup_enable_8254_timer);
378
379
380 /*
381  * Find the IRQ entry number of a certain pin.
382  */
383 static int find_irq_entry(int apic, int pin, int type)
384 {
385         int i;
386
387         for (i = 0; i < mp_irq_entries; i++)
388                 if (mp_irqs[i].mpc_irqtype == type &&
389                     (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
390                      mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
391                     mp_irqs[i].mpc_dstirq == pin)
392                         return i;
393
394         return -1;
395 }
396
397 /*
398  * Find the pin to which IRQ[irq] (ISA) is connected
399  */
400 static int __init find_isa_irq_pin(int irq, int type)
401 {
402         int i;
403
404         for (i = 0; i < mp_irq_entries; i++) {
405                 int lbus = mp_irqs[i].mpc_srcbus;
406
407                 if (test_bit(lbus, mp_bus_not_pci) &&
408                     (mp_irqs[i].mpc_irqtype == type) &&
409                     (mp_irqs[i].mpc_srcbusirq == irq))
410
411                         return mp_irqs[i].mpc_dstirq;
412         }
413         return -1;
414 }
415
416 static int __init find_isa_irq_apic(int irq, int type)
417 {
418         int i;
419
420         for (i = 0; i < mp_irq_entries; i++) {
421                 int lbus = mp_irqs[i].mpc_srcbus;
422
423                 if (test_bit(lbus, mp_bus_not_pci) &&
424                     (mp_irqs[i].mpc_irqtype == type) &&
425                     (mp_irqs[i].mpc_srcbusirq == irq))
426                         break;
427         }
428         if (i < mp_irq_entries) {
429                 int apic;
430                 for(apic = 0; apic < nr_ioapics; apic++) {
431                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
432                                 return apic;
433                 }
434         }
435
436         return -1;
437 }
438
439 /*
440  * Find a specific PCI IRQ entry.
441  * Not an __init, possibly needed by modules
442  */
443 static int pin_2_irq(int idx, int apic, int pin);
444
445 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
446 {
447         int apic, i, best_guess = -1;
448
449         apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
450                 bus, slot, pin);
451         if (mp_bus_id_to_pci_bus[bus] == -1) {
452                 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
453                 return -1;
454         }
455         for (i = 0; i < mp_irq_entries; i++) {
456                 int lbus = mp_irqs[i].mpc_srcbus;
457
458                 for (apic = 0; apic < nr_ioapics; apic++)
459                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
460                             mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
461                                 break;
462
463                 if (!test_bit(lbus, mp_bus_not_pci) &&
464                     !mp_irqs[i].mpc_irqtype &&
465                     (bus == lbus) &&
466                     (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
467                         int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
468
469                         if (!(apic || IO_APIC_IRQ(irq)))
470                                 continue;
471
472                         if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
473                                 return irq;
474                         /*
475                          * Use the first all-but-pin matching entry as a
476                          * best-guess fuzzy result for broken mptables.
477                          */
478                         if (best_guess < 0)
479                                 best_guess = irq;
480                 }
481         }
482         BUG_ON(best_guess >= NR_IRQS);
483         return best_guess;
484 }
485
486 /* ISA interrupts are always polarity zero edge triggered,
487  * when listed as conforming in the MP table. */
488
489 #define default_ISA_trigger(idx)        (0)
490 #define default_ISA_polarity(idx)       (0)
491
492 /* PCI interrupts are always polarity one level triggered,
493  * when listed as conforming in the MP table. */
494
495 #define default_PCI_trigger(idx)        (1)
496 #define default_PCI_polarity(idx)       (1)
497
498 static int __init MPBIOS_polarity(int idx)
499 {
500         int bus = mp_irqs[idx].mpc_srcbus;
501         int polarity;
502
503         /*
504          * Determine IRQ line polarity (high active or low active):
505          */
506         switch (mp_irqs[idx].mpc_irqflag & 3)
507         {
508                 case 0: /* conforms, ie. bus-type dependent polarity */
509                         if (test_bit(bus, mp_bus_not_pci))
510                                 polarity = default_ISA_polarity(idx);
511                         else
512                                 polarity = default_PCI_polarity(idx);
513                         break;
514                 case 1: /* high active */
515                 {
516                         polarity = 0;
517                         break;
518                 }
519                 case 2: /* reserved */
520                 {
521                         printk(KERN_WARNING "broken BIOS!!\n");
522                         polarity = 1;
523                         break;
524                 }
525                 case 3: /* low active */
526                 {
527                         polarity = 1;
528                         break;
529                 }
530                 default: /* invalid */
531                 {
532                         printk(KERN_WARNING "broken BIOS!!\n");
533                         polarity = 1;
534                         break;
535                 }
536         }
537         return polarity;
538 }
539
540 static int MPBIOS_trigger(int idx)
541 {
542         int bus = mp_irqs[idx].mpc_srcbus;
543         int trigger;
544
545         /*
546          * Determine IRQ trigger mode (edge or level sensitive):
547          */
548         switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
549         {
550                 case 0: /* conforms, ie. bus-type dependent */
551                         if (test_bit(bus, mp_bus_not_pci))
552                                 trigger = default_ISA_trigger(idx);
553                         else
554                                 trigger = default_PCI_trigger(idx);
555                         break;
556                 case 1: /* edge */
557                 {
558                         trigger = 0;
559                         break;
560                 }
561                 case 2: /* reserved */
562                 {
563                         printk(KERN_WARNING "broken BIOS!!\n");
564                         trigger = 1;
565                         break;
566                 }
567                 case 3: /* level */
568                 {
569                         trigger = 1;
570                         break;
571                 }
572                 default: /* invalid */
573                 {
574                         printk(KERN_WARNING "broken BIOS!!\n");
575                         trigger = 0;
576                         break;
577                 }
578         }
579         return trigger;
580 }
581
582 static inline int irq_polarity(int idx)
583 {
584         return MPBIOS_polarity(idx);
585 }
586
587 static inline int irq_trigger(int idx)
588 {
589         return MPBIOS_trigger(idx);
590 }
591
592 static int pin_2_irq(int idx, int apic, int pin)
593 {
594         int irq, i;
595         int bus = mp_irqs[idx].mpc_srcbus;
596
597         /*
598          * Debugging check, we are in big trouble if this message pops up!
599          */
600         if (mp_irqs[idx].mpc_dstirq != pin)
601                 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
602
603         if (test_bit(bus, mp_bus_not_pci)) {
604                 irq = mp_irqs[idx].mpc_srcbusirq;
605         } else {
606                 /*
607                  * PCI IRQs are mapped in order
608                  */
609                 i = irq = 0;
610                 while (i < apic)
611                         irq += nr_ioapic_registers[i++];
612                 irq += pin;
613         }
614         BUG_ON(irq >= NR_IRQS);
615         return irq;
616 }
617
618 static inline int IO_APIC_irq_trigger(int irq)
619 {
620         int apic, idx, pin;
621
622         for (apic = 0; apic < nr_ioapics; apic++) {
623                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
624                         idx = find_irq_entry(apic,pin,mp_INT);
625                         if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin)))
626                                 return irq_trigger(idx);
627                 }
628         }
629         /*
630          * nonexistent IRQs are edge default
631          */
632         return 0;
633 }
634
635 /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
636 static u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = {
637         [0] = FIRST_EXTERNAL_VECTOR + 0,
638         [1] = FIRST_EXTERNAL_VECTOR + 1,
639         [2] = FIRST_EXTERNAL_VECTOR + 2,
640         [3] = FIRST_EXTERNAL_VECTOR + 3,
641         [4] = FIRST_EXTERNAL_VECTOR + 4,
642         [5] = FIRST_EXTERNAL_VECTOR + 5,
643         [6] = FIRST_EXTERNAL_VECTOR + 6,
644         [7] = FIRST_EXTERNAL_VECTOR + 7,
645         [8] = FIRST_EXTERNAL_VECTOR + 8,
646         [9] = FIRST_EXTERNAL_VECTOR + 9,
647         [10] = FIRST_EXTERNAL_VECTOR + 10,
648         [11] = FIRST_EXTERNAL_VECTOR + 11,
649         [12] = FIRST_EXTERNAL_VECTOR + 12,
650         [13] = FIRST_EXTERNAL_VECTOR + 13,
651         [14] = FIRST_EXTERNAL_VECTOR + 14,
652         [15] = FIRST_EXTERNAL_VECTOR + 15,
653 };
654
655 static cpumask_t irq_domain[NR_IRQ_VECTORS] __read_mostly = {
656         [0] = CPU_MASK_ALL,
657         [1] = CPU_MASK_ALL,
658         [2] = CPU_MASK_ALL,
659         [3] = CPU_MASK_ALL,
660         [4] = CPU_MASK_ALL,
661         [5] = CPU_MASK_ALL,
662         [6] = CPU_MASK_ALL,
663         [7] = CPU_MASK_ALL,
664         [8] = CPU_MASK_ALL,
665         [9] = CPU_MASK_ALL,
666         [10] = CPU_MASK_ALL,
667         [11] = CPU_MASK_ALL,
668         [12] = CPU_MASK_ALL,
669         [13] = CPU_MASK_ALL,
670         [14] = CPU_MASK_ALL,
671         [15] = CPU_MASK_ALL,
672 };
673
674 static int __assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result)
675 {
676         /*
677          * NOTE! The local APIC isn't very good at handling
678          * multiple interrupts at the same interrupt level.
679          * As the interrupt level is determined by taking the
680          * vector number and shifting that right by 4, we
681          * want to spread these out a bit so that they don't
682          * all fall in the same interrupt level.
683          *
684          * Also, we've got to be careful not to trash gate
685          * 0x80, because int 0x80 is hm, kind of importantish. ;)
686          */
687         static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
688         cpumask_t old_mask = CPU_MASK_NONE;
689         int old_vector = -1;
690         int cpu;
691
692         BUG_ON((unsigned)irq >= NR_IRQ_VECTORS);
693
694         /* Only try and allocate irqs on cpus that are present */
695         cpus_and(mask, mask, cpu_online_map);
696
697         if (irq_vector[irq] > 0)
698                 old_vector = irq_vector[irq];
699         if (old_vector > 0) {
700                 cpus_and(*result, irq_domain[irq], mask);
701                 if (!cpus_empty(*result))
702                         return old_vector;
703                 cpus_and(old_mask, irq_domain[irq], cpu_online_map);
704         }
705
706         for_each_cpu_mask(cpu, mask) {
707                 cpumask_t domain, new_mask;
708                 int new_cpu, old_cpu;
709                 int vector, offset;
710
711                 domain = vector_allocation_domain(cpu);
712                 cpus_and(new_mask, domain, cpu_online_map);
713
714                 vector = current_vector;
715                 offset = current_offset;
716 next:
717                 vector += 8;
718                 if (vector >= FIRST_SYSTEM_VECTOR) {
719                         /* If we run out of vectors on large boxen, must share them. */
720                         offset = (offset + 1) % 8;
721                         vector = FIRST_DEVICE_VECTOR + offset;
722                 }
723                 if (unlikely(current_vector == vector))
724                         continue;
725                 if (vector == IA32_SYSCALL_VECTOR)
726                         goto next;
727                 for_each_cpu_mask(new_cpu, new_mask)
728                         if (per_cpu(vector_irq, new_cpu)[vector] != -1)
729                                 goto next;
730                 /* Found one! */
731                 current_vector = vector;
732                 current_offset = offset;
733                 for_each_cpu_mask(old_cpu, old_mask)
734                         per_cpu(vector_irq, old_cpu)[old_vector] = -1;
735                 for_each_cpu_mask(new_cpu, new_mask)
736                         per_cpu(vector_irq, new_cpu)[vector] = irq;
737                 irq_vector[irq] = vector;
738                 irq_domain[irq] = domain;
739                 cpus_and(*result, domain, mask);
740                 return vector;
741         }
742         return -ENOSPC;
743 }
744
745 static int assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result)
746 {
747         int vector;
748         unsigned long flags;
749
750         spin_lock_irqsave(&vector_lock, flags);
751         vector = __assign_irq_vector(irq, mask, result);
752         spin_unlock_irqrestore(&vector_lock, flags);
753         return vector;
754 }
755
756 static void __clear_irq_vector(int irq)
757 {
758         cpumask_t mask;
759         int cpu, vector;
760
761         BUG_ON(!irq_vector[irq]);
762
763         vector = irq_vector[irq];
764         cpus_and(mask, irq_domain[irq], cpu_online_map);
765         for_each_cpu_mask(cpu, mask)
766                 per_cpu(vector_irq, cpu)[vector] = -1;
767
768         irq_vector[irq] = 0;
769         irq_domain[irq] = CPU_MASK_NONE;
770 }
771
772 void __setup_vector_irq(int cpu)
773 {
774         /* Initialize vector_irq on a new cpu */
775         /* This function must be called with vector_lock held */
776         int irq, vector;
777
778         /* Mark the inuse vectors */
779         for (irq = 0; irq < NR_IRQ_VECTORS; ++irq) {
780                 if (!cpu_isset(cpu, irq_domain[irq]))
781                         continue;
782                 vector = irq_vector[irq];
783                 per_cpu(vector_irq, cpu)[vector] = irq;
784         }
785         /* Mark the free vectors */
786         for (vector = 0; vector < NR_VECTORS; ++vector) {
787                 irq = per_cpu(vector_irq, cpu)[vector];
788                 if (irq < 0)
789                         continue;
790                 if (!cpu_isset(cpu, irq_domain[irq]))
791                         per_cpu(vector_irq, cpu)[vector] = -1;
792         }
793 }
794
795
796 static struct irq_chip ioapic_chip;
797
798 #define IOAPIC_AUTO     -1
799 #define IOAPIC_EDGE     0
800 #define IOAPIC_LEVEL    1
801
802 static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
803 {
804         if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
805                         trigger == IOAPIC_LEVEL)
806                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
807                                               handle_fasteoi_irq, "fasteoi");
808         else
809                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
810                                               handle_edge_irq, "edge");
811 }
812 static void __init setup_IO_APIC_irq(int apic, int pin, int idx, int irq)
813 {
814         struct IO_APIC_route_entry entry;
815         int vector;
816         unsigned long flags;
817
818
819         /*
820          * add it to the IO-APIC irq-routing table:
821          */
822         memset(&entry,0,sizeof(entry));
823
824         entry.delivery_mode = INT_DELIVERY_MODE;
825         entry.dest_mode = INT_DEST_MODE;
826         entry.mask = 0;                         /* enable IRQ */
827         entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
828
829         entry.trigger = irq_trigger(idx);
830         entry.polarity = irq_polarity(idx);
831
832         if (irq_trigger(idx)) {
833                 entry.trigger = 1;
834                 entry.mask = 1;
835                 entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
836         }
837
838         if (!apic && !IO_APIC_IRQ(irq))
839                 return;
840
841         if (IO_APIC_IRQ(irq)) {
842                 cpumask_t mask;
843                 vector = assign_irq_vector(irq, TARGET_CPUS, &mask);
844                 if (vector < 0)
845                         return;
846
847                 entry.dest = cpu_mask_to_apicid(mask);
848                 entry.vector = vector;
849
850                 ioapic_register_intr(irq, vector, IOAPIC_AUTO);
851                 if (!apic && (irq < 16))
852                         disable_8259A_irq(irq);
853         }
854
855         ioapic_write_entry(apic, pin, entry);
856
857         spin_lock_irqsave(&ioapic_lock, flags);
858         irq_desc[irq].affinity = TARGET_CPUS;
859         spin_unlock_irqrestore(&ioapic_lock, flags);
860
861 }
862
863 static void __init setup_IO_APIC_irqs(void)
864 {
865         int apic, pin, idx, irq, first_notcon = 1;
866
867         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
868
869         for (apic = 0; apic < nr_ioapics; apic++) {
870         for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
871
872                 idx = find_irq_entry(apic,pin,mp_INT);
873                 if (idx == -1) {
874                         if (first_notcon) {
875                                 apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
876                                 first_notcon = 0;
877                         } else
878                                 apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
879                         continue;
880                 }
881
882                 irq = pin_2_irq(idx, apic, pin);
883                 add_pin_to_irq(irq, apic, pin);
884
885                 setup_IO_APIC_irq(apic, pin, idx, irq);
886
887         }
888         }
889
890         if (!first_notcon)
891                 apic_printk(APIC_VERBOSE," not connected.\n");
892 }
893
894 /*
895  * Set up the 8259A-master output pin as broadcast to all
896  * CPUs.
897  */
898 static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
899 {
900         struct IO_APIC_route_entry entry;
901         unsigned long flags;
902
903         memset(&entry,0,sizeof(entry));
904
905         disable_8259A_irq(0);
906
907         /* mask LVT0 */
908         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
909
910         /*
911          * We use logical delivery to get the timer IRQ
912          * to the first CPU.
913          */
914         entry.dest_mode = INT_DEST_MODE;
915         entry.mask = 0;                                 /* unmask IRQ now */
916         entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
917         entry.delivery_mode = INT_DELIVERY_MODE;
918         entry.polarity = 0;
919         entry.trigger = 0;
920         entry.vector = vector;
921
922         /*
923          * The timer IRQ doesn't have to know that behind the
924          * scene we have a 8259A-master in AEOI mode ...
925          */
926         set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
927
928         /*
929          * Add it to the IO-APIC irq-routing table:
930          */
931         spin_lock_irqsave(&ioapic_lock, flags);
932         io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
933         io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
934         spin_unlock_irqrestore(&ioapic_lock, flags);
935
936         enable_8259A_irq(0);
937 }
938
939 void __init UNEXPECTED_IO_APIC(void)
940 {
941 }
942
943 void __apicdebuginit print_IO_APIC(void)
944 {
945         int apic, i;
946         union IO_APIC_reg_00 reg_00;
947         union IO_APIC_reg_01 reg_01;
948         union IO_APIC_reg_02 reg_02;
949         unsigned long flags;
950
951         if (apic_verbosity == APIC_QUIET)
952                 return;
953
954         printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
955         for (i = 0; i < nr_ioapics; i++)
956                 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
957                        mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
958
959         /*
960          * We are a bit conservative about what we expect.  We have to
961          * know about every hardware change ASAP.
962          */
963         printk(KERN_INFO "testing the IO APIC.......................\n");
964
965         for (apic = 0; apic < nr_ioapics; apic++) {
966
967         spin_lock_irqsave(&ioapic_lock, flags);
968         reg_00.raw = io_apic_read(apic, 0);
969         reg_01.raw = io_apic_read(apic, 1);
970         if (reg_01.bits.version >= 0x10)
971                 reg_02.raw = io_apic_read(apic, 2);
972         spin_unlock_irqrestore(&ioapic_lock, flags);
973
974         printk("\n");
975         printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
976         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
977         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
978         if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
979                 UNEXPECTED_IO_APIC();
980
981         printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
982         printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);
983         if (    (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
984                 (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
985                 (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
986                 (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
987                 (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
988                 (reg_01.bits.entries != 0x2E) &&
989                 (reg_01.bits.entries != 0x3F) &&
990                 (reg_01.bits.entries != 0x03) 
991         )
992                 UNEXPECTED_IO_APIC();
993
994         printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
995         printk(KERN_DEBUG ".......     : IO APIC version: %04X\n", reg_01.bits.version);
996         if (    (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
997                 (reg_01.bits.version != 0x02) && /* 82801BA IO-APICs (ICH2) */
998                 (reg_01.bits.version != 0x10) && /* oldest IO-APICs */
999                 (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
1000                 (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
1001                 (reg_01.bits.version != 0x20)    /* Intel P64H (82806 AA) */
1002         )
1003                 UNEXPECTED_IO_APIC();
1004         if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
1005                 UNEXPECTED_IO_APIC();
1006
1007         if (reg_01.bits.version >= 0x10) {
1008                 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1009                 printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
1010                 if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
1011                         UNEXPECTED_IO_APIC();
1012         }
1013
1014         printk(KERN_DEBUG ".... IRQ redirection table:\n");
1015
1016         printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
1017                           " Stat Dmod Deli Vect:   \n");
1018
1019         for (i = 0; i <= reg_01.bits.entries; i++) {
1020                 struct IO_APIC_route_entry entry;
1021
1022                 entry = ioapic_read_entry(apic, i);
1023
1024                 printk(KERN_DEBUG " %02x %03X ",
1025                         i,
1026                         entry.dest
1027                 );
1028
1029                 printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
1030                         entry.mask,
1031                         entry.trigger,
1032                         entry.irr,
1033                         entry.polarity,
1034                         entry.delivery_status,
1035                         entry.dest_mode,
1036                         entry.delivery_mode,
1037                         entry.vector
1038                 );
1039         }
1040         }
1041         printk(KERN_DEBUG "IRQ to pin mappings:\n");
1042         for (i = 0; i < NR_IRQS; i++) {
1043                 struct irq_pin_list *entry = irq_2_pin + i;
1044                 if (entry->pin < 0)
1045                         continue;
1046                 printk(KERN_DEBUG "IRQ%d ", i);
1047                 for (;;) {
1048                         printk("-> %d:%d", entry->apic, entry->pin);
1049                         if (!entry->next)
1050                                 break;
1051                         entry = irq_2_pin + entry->next;
1052                 }
1053                 printk("\n");
1054         }
1055
1056         printk(KERN_INFO ".................................... done.\n");
1057
1058         return;
1059 }
1060
1061 #if 0
1062
1063 static __apicdebuginit void print_APIC_bitfield (int base)
1064 {
1065         unsigned int v;
1066         int i, j;
1067
1068         if (apic_verbosity == APIC_QUIET)
1069                 return;
1070
1071         printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1072         for (i = 0; i < 8; i++) {
1073                 v = apic_read(base + i*0x10);
1074                 for (j = 0; j < 32; j++) {
1075                         if (v & (1<<j))
1076                                 printk("1");
1077                         else
1078                                 printk("0");
1079                 }
1080                 printk("\n");
1081         }
1082 }
1083
1084 void __apicdebuginit print_local_APIC(void * dummy)
1085 {
1086         unsigned int v, ver, maxlvt;
1087
1088         if (apic_verbosity == APIC_QUIET)
1089                 return;
1090
1091         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1092                 smp_processor_id(), hard_smp_processor_id());
1093         v = apic_read(APIC_ID);
1094         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(v));
1095         v = apic_read(APIC_LVR);
1096         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1097         ver = GET_APIC_VERSION(v);
1098         maxlvt = get_maxlvt();
1099
1100         v = apic_read(APIC_TASKPRI);
1101         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1102
1103         v = apic_read(APIC_ARBPRI);
1104         printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1105                 v & APIC_ARBPRI_MASK);
1106         v = apic_read(APIC_PROCPRI);
1107         printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1108
1109         v = apic_read(APIC_EOI);
1110         printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1111         v = apic_read(APIC_RRR);
1112         printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1113         v = apic_read(APIC_LDR);
1114         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1115         v = apic_read(APIC_DFR);
1116         printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1117         v = apic_read(APIC_SPIV);
1118         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1119
1120         printk(KERN_DEBUG "... APIC ISR field:\n");
1121         print_APIC_bitfield(APIC_ISR);
1122         printk(KERN_DEBUG "... APIC TMR field:\n");
1123         print_APIC_bitfield(APIC_TMR);
1124         printk(KERN_DEBUG "... APIC IRR field:\n");
1125         print_APIC_bitfield(APIC_IRR);
1126
1127         v = apic_read(APIC_ESR);
1128         printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1129
1130         v = apic_read(APIC_ICR);
1131         printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1132         v = apic_read(APIC_ICR2);
1133         printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1134
1135         v = apic_read(APIC_LVTT);
1136         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1137
1138         if (maxlvt > 3) {                       /* PC is LVT#4. */
1139                 v = apic_read(APIC_LVTPC);
1140                 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1141         }
1142         v = apic_read(APIC_LVT0);
1143         printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1144         v = apic_read(APIC_LVT1);
1145         printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1146
1147         if (maxlvt > 2) {                       /* ERR is LVT#3. */
1148                 v = apic_read(APIC_LVTERR);
1149                 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1150         }
1151
1152         v = apic_read(APIC_TMICT);
1153         printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1154         v = apic_read(APIC_TMCCT);
1155         printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1156         v = apic_read(APIC_TDCR);
1157         printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1158         printk("\n");
1159 }
1160
1161 void print_all_local_APICs (void)
1162 {
1163         on_each_cpu(print_local_APIC, NULL, 1, 1);
1164 }
1165
1166 void __apicdebuginit print_PIC(void)
1167 {
1168         unsigned int v;
1169         unsigned long flags;
1170
1171         if (apic_verbosity == APIC_QUIET)
1172                 return;
1173
1174         printk(KERN_DEBUG "\nprinting PIC contents\n");
1175
1176         spin_lock_irqsave(&i8259A_lock, flags);
1177
1178         v = inb(0xa1) << 8 | inb(0x21);
1179         printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
1180
1181         v = inb(0xa0) << 8 | inb(0x20);
1182         printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
1183
1184         outb(0x0b,0xa0);
1185         outb(0x0b,0x20);
1186         v = inb(0xa0) << 8 | inb(0x20);
1187         outb(0x0a,0xa0);
1188         outb(0x0a,0x20);
1189
1190         spin_unlock_irqrestore(&i8259A_lock, flags);
1191
1192         printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
1193
1194         v = inb(0x4d1) << 8 | inb(0x4d0);
1195         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1196 }
1197
1198 #endif  /*  0  */
1199
1200 static void __init enable_IO_APIC(void)
1201 {
1202         union IO_APIC_reg_01 reg_01;
1203         int i8259_apic, i8259_pin;
1204         int i, apic;
1205         unsigned long flags;
1206
1207         for (i = 0; i < PIN_MAP_SIZE; i++) {
1208                 irq_2_pin[i].pin = -1;
1209                 irq_2_pin[i].next = 0;
1210         }
1211
1212         /*
1213          * The number of IO-APIC IRQ registers (== #pins):
1214          */
1215         for (apic = 0; apic < nr_ioapics; apic++) {
1216                 spin_lock_irqsave(&ioapic_lock, flags);
1217                 reg_01.raw = io_apic_read(apic, 1);
1218                 spin_unlock_irqrestore(&ioapic_lock, flags);
1219                 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1220         }
1221         for(apic = 0; apic < nr_ioapics; apic++) {
1222                 int pin;
1223                 /* See if any of the pins is in ExtINT mode */
1224                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1225                         struct IO_APIC_route_entry entry;
1226                         entry = ioapic_read_entry(apic, pin);
1227
1228                         /* If the interrupt line is enabled and in ExtInt mode
1229                          * I have found the pin where the i8259 is connected.
1230                          */
1231                         if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1232                                 ioapic_i8259.apic = apic;
1233                                 ioapic_i8259.pin  = pin;
1234                                 goto found_i8259;
1235                         }
1236                 }
1237         }
1238  found_i8259:
1239         /* Look to see what if the MP table has reported the ExtINT */
1240         i8259_pin  = find_isa_irq_pin(0, mp_ExtINT);
1241         i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1242         /* Trust the MP table if nothing is setup in the hardware */
1243         if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1244                 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1245                 ioapic_i8259.pin  = i8259_pin;
1246                 ioapic_i8259.apic = i8259_apic;
1247         }
1248         /* Complain if the MP table and the hardware disagree */
1249         if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1250                 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1251         {
1252                 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1253         }
1254
1255         /*
1256          * Do not trust the IO-APIC being empty at bootup
1257          */
1258         clear_IO_APIC();
1259 }
1260
1261 /*
1262  * Not an __init, needed by the reboot code
1263  */
1264 void disable_IO_APIC(void)
1265 {
1266         /*
1267          * Clear the IO-APIC before rebooting:
1268          */
1269         clear_IO_APIC();
1270
1271         /*
1272          * If the i8259 is routed through an IOAPIC
1273          * Put that IOAPIC in virtual wire mode
1274          * so legacy interrupts can be delivered.
1275          */
1276         if (ioapic_i8259.pin != -1) {
1277                 struct IO_APIC_route_entry entry;
1278
1279                 memset(&entry, 0, sizeof(entry));
1280                 entry.mask            = 0; /* Enabled */
1281                 entry.trigger         = 0; /* Edge */
1282                 entry.irr             = 0;
1283                 entry.polarity        = 0; /* High */
1284                 entry.delivery_status = 0;
1285                 entry.dest_mode       = 0; /* Physical */
1286                 entry.delivery_mode   = dest_ExtINT; /* ExtInt */
1287                 entry.vector          = 0;
1288                 entry.dest          = GET_APIC_ID(apic_read(APIC_ID));
1289
1290                 /*
1291                  * Add it to the IO-APIC irq-routing table:
1292                  */
1293                 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1294         }
1295
1296         disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1297 }
1298
1299 /*
1300  * There is a nasty bug in some older SMP boards, their mptable lies
1301  * about the timer IRQ. We do the following to work around the situation:
1302  *
1303  *      - timer IRQ defaults to IO-APIC IRQ
1304  *      - if this function detects that timer IRQs are defunct, then we fall
1305  *        back to ISA timer IRQs
1306  */
1307 static int __init timer_irq_works(void)
1308 {
1309         unsigned long t1 = jiffies;
1310
1311         local_irq_enable();
1312         /* Let ten ticks pass... */
1313         mdelay((10 * 1000) / HZ);
1314
1315         /*
1316          * Expect a few ticks at least, to be sure some possible
1317          * glue logic does not lock up after one or two first
1318          * ticks in a non-ExtINT mode.  Also the local APIC
1319          * might have cached one ExtINT interrupt.  Finally, at
1320          * least one tick may be lost due to delays.
1321          */
1322
1323         /* jiffies wrap? */
1324         if (jiffies - t1 > 4)
1325                 return 1;
1326         return 0;
1327 }
1328
1329 /*
1330  * In the SMP+IOAPIC case it might happen that there are an unspecified
1331  * number of pending IRQ events unhandled. These cases are very rare,
1332  * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1333  * better to do it this way as thus we do not have to be aware of
1334  * 'pending' interrupts in the IRQ path, except at this point.
1335  */
1336 /*
1337  * Edge triggered needs to resend any interrupt
1338  * that was delayed but this is now handled in the device
1339  * independent code.
1340  */
1341
1342 /*
1343  * Starting up a edge-triggered IO-APIC interrupt is
1344  * nasty - we need to make sure that we get the edge.
1345  * If it is already asserted for some reason, we need
1346  * return 1 to indicate that is was pending.
1347  *
1348  * This is not complete - we should be able to fake
1349  * an edge even if it isn't on the 8259A...
1350  */
1351
1352 static unsigned int startup_ioapic_irq(unsigned int irq)
1353 {
1354         int was_pending = 0;
1355         unsigned long flags;
1356
1357         spin_lock_irqsave(&ioapic_lock, flags);
1358         if (irq < 16) {
1359                 disable_8259A_irq(irq);
1360                 if (i8259A_irq_pending(irq))
1361                         was_pending = 1;
1362         }
1363         __unmask_IO_APIC_irq(irq);
1364         spin_unlock_irqrestore(&ioapic_lock, flags);
1365
1366         return was_pending;
1367 }
1368
1369 static int ioapic_retrigger_irq(unsigned int irq)
1370 {
1371         cpumask_t mask;
1372         unsigned vector;
1373         unsigned long flags;
1374
1375         spin_lock_irqsave(&vector_lock, flags);
1376         vector = irq_vector[irq];
1377         cpus_clear(mask);
1378         cpu_set(first_cpu(irq_domain[irq]), mask);
1379
1380         send_IPI_mask(mask, vector);
1381         spin_unlock_irqrestore(&vector_lock, flags);
1382
1383         return 1;
1384 }
1385
1386 /*
1387  * Level and edge triggered IO-APIC interrupts need different handling,
1388  * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1389  * handled with the level-triggered descriptor, but that one has slightly
1390  * more overhead. Level-triggered interrupts cannot be handled with the
1391  * edge-triggered handler, without risking IRQ storms and other ugly
1392  * races.
1393  */
1394
1395 static void ack_apic_edge(unsigned int irq)
1396 {
1397         move_native_irq(irq);
1398         ack_APIC_irq();
1399 }
1400
1401 static void ack_apic_level(unsigned int irq)
1402 {
1403         int do_unmask_irq = 0;
1404
1405 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
1406         /* If we are moving the irq we need to mask it */
1407         if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
1408                 do_unmask_irq = 1;
1409                 mask_IO_APIC_irq(irq);
1410         }
1411 #endif
1412
1413         /*
1414          * We must acknowledge the irq before we move it or the acknowledge will
1415          * not propogate properly.
1416          */
1417         ack_APIC_irq();
1418
1419         /* Now we can move and renable the irq */
1420         move_masked_irq(irq);
1421         if (unlikely(do_unmask_irq))
1422                 unmask_IO_APIC_irq(irq);
1423 }
1424
1425 static struct irq_chip ioapic_chip __read_mostly = {
1426         .name           = "IO-APIC",
1427         .startup        = startup_ioapic_irq,
1428         .mask           = mask_IO_APIC_irq,
1429         .unmask         = unmask_IO_APIC_irq,
1430         .ack            = ack_apic_edge,
1431         .eoi            = ack_apic_level,
1432 #ifdef CONFIG_SMP
1433         .set_affinity   = set_ioapic_affinity_irq,
1434 #endif
1435         .retrigger      = ioapic_retrigger_irq,
1436 };
1437
1438 static inline void init_IO_APIC_traps(void)
1439 {
1440         int irq;
1441
1442         /*
1443          * NOTE! The local APIC isn't very good at handling
1444          * multiple interrupts at the same interrupt level.
1445          * As the interrupt level is determined by taking the
1446          * vector number and shifting that right by 4, we
1447          * want to spread these out a bit so that they don't
1448          * all fall in the same interrupt level.
1449          *
1450          * Also, we've got to be careful not to trash gate
1451          * 0x80, because int 0x80 is hm, kind of importantish. ;)
1452          */
1453         for (irq = 0; irq < NR_IRQS ; irq++) {
1454                 int tmp = irq;
1455                 if (IO_APIC_IRQ(tmp) && !irq_vector[tmp]) {
1456                         /*
1457                          * Hmm.. We don't have an entry for this,
1458                          * so default to an old-fashioned 8259
1459                          * interrupt if we can..
1460                          */
1461                         if (irq < 16)
1462                                 make_8259A_irq(irq);
1463                         else
1464                                 /* Strange. Oh, well.. */
1465                                 irq_desc[irq].chip = &no_irq_chip;
1466                 }
1467         }
1468 }
1469
1470 static void enable_lapic_irq (unsigned int irq)
1471 {
1472         unsigned long v;
1473
1474         v = apic_read(APIC_LVT0);
1475         apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1476 }
1477
1478 static void disable_lapic_irq (unsigned int irq)
1479 {
1480         unsigned long v;
1481
1482         v = apic_read(APIC_LVT0);
1483         apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1484 }
1485
1486 static void ack_lapic_irq (unsigned int irq)
1487 {
1488         ack_APIC_irq();
1489 }
1490
1491 static void end_lapic_irq (unsigned int i) { /* nothing */ }
1492
1493 static struct hw_interrupt_type lapic_irq_type __read_mostly = {
1494         .typename = "local-APIC-edge",
1495         .startup = NULL, /* startup_irq() not used for IRQ0 */
1496         .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
1497         .enable = enable_lapic_irq,
1498         .disable = disable_lapic_irq,
1499         .ack = ack_lapic_irq,
1500         .end = end_lapic_irq,
1501 };
1502
1503 static void setup_nmi (void)
1504 {
1505         /*
1506          * Dirty trick to enable the NMI watchdog ...
1507          * We put the 8259A master into AEOI mode and
1508          * unmask on all local APICs LVT0 as NMI.
1509          *
1510          * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1511          * is from Maciej W. Rozycki - so we do not have to EOI from
1512          * the NMI handler or the timer interrupt.
1513          */ 
1514         printk(KERN_INFO "activating NMI Watchdog ...");
1515
1516         enable_NMI_through_LVT0(NULL);
1517
1518         printk(" done.\n");
1519 }
1520
1521 /*
1522  * This looks a bit hackish but it's about the only one way of sending
1523  * a few INTA cycles to 8259As and any associated glue logic.  ICR does
1524  * not support the ExtINT mode, unfortunately.  We need to send these
1525  * cycles as some i82489DX-based boards have glue logic that keeps the
1526  * 8259A interrupt line asserted until INTA.  --macro
1527  */
1528 static inline void unlock_ExtINT_logic(void)
1529 {
1530         int apic, pin, i;
1531         struct IO_APIC_route_entry entry0, entry1;
1532         unsigned char save_control, save_freq_select;
1533         unsigned long flags;
1534
1535         pin  = find_isa_irq_pin(8, mp_INT);
1536         apic = find_isa_irq_apic(8, mp_INT);
1537         if (pin == -1)
1538                 return;
1539
1540         spin_lock_irqsave(&ioapic_lock, flags);
1541         *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
1542         *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
1543         spin_unlock_irqrestore(&ioapic_lock, flags);
1544         clear_IO_APIC_pin(apic, pin);
1545
1546         memset(&entry1, 0, sizeof(entry1));
1547
1548         entry1.dest_mode = 0;                   /* physical delivery */
1549         entry1.mask = 0;                        /* unmask IRQ now */
1550         entry1.dest = hard_smp_processor_id();
1551         entry1.delivery_mode = dest_ExtINT;
1552         entry1.polarity = entry0.polarity;
1553         entry1.trigger = 0;
1554         entry1.vector = 0;
1555
1556         spin_lock_irqsave(&ioapic_lock, flags);
1557         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
1558         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
1559         spin_unlock_irqrestore(&ioapic_lock, flags);
1560
1561         save_control = CMOS_READ(RTC_CONTROL);
1562         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1563         CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
1564                    RTC_FREQ_SELECT);
1565         CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
1566
1567         i = 100;
1568         while (i-- > 0) {
1569                 mdelay(10);
1570                 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
1571                         i -= 10;
1572         }
1573
1574         CMOS_WRITE(save_control, RTC_CONTROL);
1575         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1576         clear_IO_APIC_pin(apic, pin);
1577
1578         spin_lock_irqsave(&ioapic_lock, flags);
1579         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
1580         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
1581         spin_unlock_irqrestore(&ioapic_lock, flags);
1582 }
1583
1584 /*
1585  * This code may look a bit paranoid, but it's supposed to cooperate with
1586  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
1587  * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
1588  * fanatically on his truly buggy board.
1589  *
1590  * FIXME: really need to revamp this for modern platforms only.
1591  */
1592 static inline void check_timer(void)
1593 {
1594         int apic1, pin1, apic2, pin2;
1595         int vector;
1596         cpumask_t mask;
1597
1598         /*
1599          * get/set the timer IRQ vector:
1600          */
1601         disable_8259A_irq(0);
1602         vector = assign_irq_vector(0, TARGET_CPUS, &mask);
1603
1604         /*
1605          * Subtle, code in do_timer_interrupt() expects an AEOI
1606          * mode for the 8259A whenever interrupts are routed
1607          * through I/O APICs.  Also IRQ0 has to be enabled in
1608          * the 8259A which implies the virtual wire has to be
1609          * disabled in the local APIC.
1610          */
1611         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1612         init_8259A(1);
1613         if (timer_over_8254 > 0)
1614                 enable_8259A_irq(0);
1615
1616         pin1  = find_isa_irq_pin(0, mp_INT);
1617         apic1 = find_isa_irq_apic(0, mp_INT);
1618         pin2  = ioapic_i8259.pin;
1619         apic2 = ioapic_i8259.apic;
1620
1621         apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
1622                 vector, apic1, pin1, apic2, pin2);
1623
1624         if (pin1 != -1) {
1625                 /*
1626                  * Ok, does IRQ0 through the IOAPIC work?
1627                  */
1628                 unmask_IO_APIC_irq(0);
1629                 if (!no_timer_check && timer_irq_works()) {
1630                         nmi_watchdog_default();
1631                         if (nmi_watchdog == NMI_IO_APIC) {
1632                                 disable_8259A_irq(0);
1633                                 setup_nmi();
1634                                 enable_8259A_irq(0);
1635                         }
1636                         if (disable_timer_pin_1 > 0)
1637                                 clear_IO_APIC_pin(0, pin1);
1638                         return;
1639                 }
1640                 clear_IO_APIC_pin(apic1, pin1);
1641                 apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
1642                                 "connected to IO-APIC\n");
1643         }
1644
1645         apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
1646                                 "through the 8259A ... ");
1647         if (pin2 != -1) {
1648                 apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
1649                         apic2, pin2);
1650                 /*
1651                  * legacy devices should be connected to IO APIC #0
1652                  */
1653                 setup_ExtINT_IRQ0_pin(apic2, pin2, vector);
1654                 if (timer_irq_works()) {
1655                         apic_printk(APIC_VERBOSE," works.\n");
1656                         nmi_watchdog_default();
1657                         if (nmi_watchdog == NMI_IO_APIC) {
1658                                 setup_nmi();
1659                         }
1660                         return;
1661                 }
1662                 /*
1663                  * Cleanup, just in case ...
1664                  */
1665                 clear_IO_APIC_pin(apic2, pin2);
1666         }
1667         apic_printk(APIC_VERBOSE," failed.\n");
1668
1669         if (nmi_watchdog == NMI_IO_APIC) {
1670                 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1671                 nmi_watchdog = 0;
1672         }
1673
1674         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
1675
1676         disable_8259A_irq(0);
1677         irq_desc[0].chip = &lapic_irq_type;
1678         apic_write(APIC_LVT0, APIC_DM_FIXED | vector);  /* Fixed mode */
1679         enable_8259A_irq(0);
1680
1681         if (timer_irq_works()) {
1682                 apic_printk(APIC_VERBOSE," works.\n");
1683                 return;
1684         }
1685         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
1686         apic_printk(APIC_VERBOSE," failed.\n");
1687
1688         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
1689
1690         init_8259A(0);
1691         make_8259A_irq(0);
1692         apic_write(APIC_LVT0, APIC_DM_EXTINT);
1693
1694         unlock_ExtINT_logic();
1695
1696         if (timer_irq_works()) {
1697                 apic_printk(APIC_VERBOSE," works.\n");
1698                 return;
1699         }
1700         apic_printk(APIC_VERBOSE," failed :(.\n");
1701         panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1702 }
1703
1704 static int __init notimercheck(char *s)
1705 {
1706         no_timer_check = 1;
1707         return 1;
1708 }
1709 __setup("no_timer_check", notimercheck);
1710
1711 /*
1712  *
1713  * IRQ's that are handled by the PIC in the MPS IOAPIC case.
1714  * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1715  *   Linux doesn't really care, as it's not actually used
1716  *   for any interrupt handling anyway.
1717  */
1718 #define PIC_IRQS        (1<<2)
1719
1720 void __init setup_IO_APIC(void)
1721 {
1722         enable_IO_APIC();
1723
1724         if (acpi_ioapic)
1725                 io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
1726         else
1727                 io_apic_irqs = ~PIC_IRQS;
1728
1729         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
1730
1731         sync_Arb_IDs();
1732         setup_IO_APIC_irqs();
1733         init_IO_APIC_traps();
1734         check_timer();
1735         if (!acpi_ioapic)
1736                 print_IO_APIC();
1737 }
1738
1739 struct sysfs_ioapic_data {
1740         struct sys_device dev;
1741         struct IO_APIC_route_entry entry[0];
1742 };
1743 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
1744
1745 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
1746 {
1747         struct IO_APIC_route_entry *entry;
1748         struct sysfs_ioapic_data *data;
1749         int i;
1750
1751         data = container_of(dev, struct sysfs_ioapic_data, dev);
1752         entry = data->entry;
1753         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
1754                 *entry = ioapic_read_entry(dev->id, i);
1755
1756         return 0;
1757 }
1758
1759 static int ioapic_resume(struct sys_device *dev)
1760 {
1761         struct IO_APIC_route_entry *entry;
1762         struct sysfs_ioapic_data *data;
1763         unsigned long flags;
1764         union IO_APIC_reg_00 reg_00;
1765         int i;
1766
1767         data = container_of(dev, struct sysfs_ioapic_data, dev);
1768         entry = data->entry;
1769
1770         spin_lock_irqsave(&ioapic_lock, flags);
1771         reg_00.raw = io_apic_read(dev->id, 0);
1772         if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
1773                 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
1774                 io_apic_write(dev->id, 0, reg_00.raw);
1775         }
1776         spin_unlock_irqrestore(&ioapic_lock, flags);
1777         for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
1778                 ioapic_write_entry(dev->id, i, entry[i]);
1779
1780         return 0;
1781 }
1782
1783 static struct sysdev_class ioapic_sysdev_class = {
1784         set_kset_name("ioapic"),
1785         .suspend = ioapic_suspend,
1786         .resume = ioapic_resume,
1787 };
1788
1789 static int __init ioapic_init_sysfs(void)
1790 {
1791         struct sys_device * dev;
1792         int i, size, error = 0;
1793
1794         error = sysdev_class_register(&ioapic_sysdev_class);
1795         if (error)
1796                 return error;
1797
1798         for (i = 0; i < nr_ioapics; i++ ) {
1799                 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
1800                         * sizeof(struct IO_APIC_route_entry);
1801                 mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
1802                 if (!mp_ioapic_data[i]) {
1803                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1804                         continue;
1805                 }
1806                 memset(mp_ioapic_data[i], 0, size);
1807                 dev = &mp_ioapic_data[i]->dev;
1808                 dev->id = i;
1809                 dev->cls = &ioapic_sysdev_class;
1810                 error = sysdev_register(dev);
1811                 if (error) {
1812                         kfree(mp_ioapic_data[i]);
1813                         mp_ioapic_data[i] = NULL;
1814                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1815                         continue;
1816                 }
1817         }
1818
1819         return 0;
1820 }
1821
1822 device_initcall(ioapic_init_sysfs);
1823
1824 /*
1825  * Dynamic irq allocate and deallocation
1826  */
1827 int create_irq(void)
1828 {
1829         /* Allocate an unused irq */
1830         int irq;
1831         int new;
1832         int vector = 0;
1833         unsigned long flags;
1834         cpumask_t mask;
1835
1836         irq = -ENOSPC;
1837         spin_lock_irqsave(&vector_lock, flags);
1838         for (new = (NR_IRQS - 1); new >= 0; new--) {
1839                 if (platform_legacy_irq(new))
1840                         continue;
1841                 if (irq_vector[new] != 0)
1842                         continue;
1843                 vector = __assign_irq_vector(new, TARGET_CPUS, &mask);
1844                 if (likely(vector > 0))
1845                         irq = new;
1846                 break;
1847         }
1848         spin_unlock_irqrestore(&vector_lock, flags);
1849
1850         if (irq >= 0) {
1851                 dynamic_irq_init(irq);
1852         }
1853         return irq;
1854 }
1855
1856 void destroy_irq(unsigned int irq)
1857 {
1858         unsigned long flags;
1859
1860         dynamic_irq_cleanup(irq);
1861
1862         spin_lock_irqsave(&vector_lock, flags);
1863         __clear_irq_vector(irq);
1864         spin_unlock_irqrestore(&vector_lock, flags);
1865 }
1866
1867 /*
1868  * MSI mesage composition
1869  */
1870 #ifdef CONFIG_PCI_MSI
1871 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
1872 {
1873         int vector;
1874         unsigned dest;
1875         cpumask_t tmp;
1876
1877         vector = assign_irq_vector(irq, TARGET_CPUS, &tmp);
1878         if (vector >= 0) {
1879                 dest = cpu_mask_to_apicid(tmp);
1880
1881                 msg->address_hi = MSI_ADDR_BASE_HI;
1882                 msg->address_lo =
1883                         MSI_ADDR_BASE_LO |
1884                         ((INT_DEST_MODE == 0) ?
1885                                 MSI_ADDR_DEST_MODE_PHYSICAL:
1886                                 MSI_ADDR_DEST_MODE_LOGICAL) |
1887                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1888                                 MSI_ADDR_REDIRECTION_CPU:
1889                                 MSI_ADDR_REDIRECTION_LOWPRI) |
1890                         MSI_ADDR_DEST_ID(dest);
1891
1892                 msg->data =
1893                         MSI_DATA_TRIGGER_EDGE |
1894                         MSI_DATA_LEVEL_ASSERT |
1895                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1896                                 MSI_DATA_DELIVERY_FIXED:
1897                                 MSI_DATA_DELIVERY_LOWPRI) |
1898                         MSI_DATA_VECTOR(vector);
1899         }
1900         return vector;
1901 }
1902
1903 #ifdef CONFIG_SMP
1904 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
1905 {
1906         struct msi_msg msg;
1907         unsigned int dest;
1908         cpumask_t tmp;
1909         int vector;
1910
1911         cpus_and(tmp, mask, cpu_online_map);
1912         if (cpus_empty(tmp))
1913                 tmp = TARGET_CPUS;
1914
1915         cpus_and(mask, tmp, CPU_MASK_ALL);
1916
1917         vector = assign_irq_vector(irq, mask, &tmp);
1918         if (vector < 0)
1919                 return;
1920
1921         dest = cpu_mask_to_apicid(tmp);
1922
1923         read_msi_msg(irq, &msg);
1924
1925         msg.data &= ~MSI_DATA_VECTOR_MASK;
1926         msg.data |= MSI_DATA_VECTOR(vector);
1927         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
1928         msg.address_lo |= MSI_ADDR_DEST_ID(dest);
1929
1930         write_msi_msg(irq, &msg);
1931         irq_desc[irq].affinity = mask;
1932 }
1933 #endif /* CONFIG_SMP */
1934
1935 /*
1936  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
1937  * which implement the MSI or MSI-X Capability Structure.
1938  */
1939 static struct irq_chip msi_chip = {
1940         .name           = "PCI-MSI",
1941         .unmask         = unmask_msi_irq,
1942         .mask           = mask_msi_irq,
1943         .ack            = ack_apic_edge,
1944 #ifdef CONFIG_SMP
1945         .set_affinity   = set_msi_irq_affinity,
1946 #endif
1947         .retrigger      = ioapic_retrigger_irq,
1948 };
1949
1950 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
1951 {
1952         struct msi_msg msg;
1953         int irq, ret;
1954         irq = create_irq();
1955         if (irq < 0)
1956                 return irq;
1957
1958         set_irq_msi(irq, desc);
1959         ret = msi_compose_msg(dev, irq, &msg);
1960         if (ret < 0) {
1961                 destroy_irq(irq);
1962                 return ret;
1963         }
1964
1965         write_msi_msg(irq, &msg);
1966
1967         set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
1968
1969         return irq;
1970 }
1971
1972 void arch_teardown_msi_irq(unsigned int irq)
1973 {
1974         destroy_irq(irq);
1975 }
1976
1977 #endif /* CONFIG_PCI_MSI */
1978
1979 /*
1980  * Hypertransport interrupt support
1981  */
1982 #ifdef CONFIG_HT_IRQ
1983
1984 #ifdef CONFIG_SMP
1985
1986 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
1987 {
1988         struct ht_irq_msg msg;
1989         fetch_ht_irq_msg(irq, &msg);
1990
1991         msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
1992         msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
1993
1994         msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
1995         msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
1996
1997         write_ht_irq_msg(irq, &msg);
1998 }
1999
2000 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2001 {
2002         unsigned int dest;
2003         cpumask_t tmp;
2004         int vector;
2005
2006         cpus_and(tmp, mask, cpu_online_map);
2007         if (cpus_empty(tmp))
2008                 tmp = TARGET_CPUS;
2009
2010         cpus_and(mask, tmp, CPU_MASK_ALL);
2011
2012         vector = assign_irq_vector(irq, mask, &tmp);
2013         if (vector < 0)
2014                 return;
2015
2016         dest = cpu_mask_to_apicid(tmp);
2017
2018         target_ht_irq(irq, dest, vector);
2019         irq_desc[irq].affinity = mask;
2020 }
2021 #endif
2022
2023 static struct irq_chip ht_irq_chip = {
2024         .name           = "PCI-HT",
2025         .mask           = mask_ht_irq,
2026         .unmask         = unmask_ht_irq,
2027         .ack            = ack_apic_edge,
2028 #ifdef CONFIG_SMP
2029         .set_affinity   = set_ht_irq_affinity,
2030 #endif
2031         .retrigger      = ioapic_retrigger_irq,
2032 };
2033
2034 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2035 {
2036         int vector;
2037         cpumask_t tmp;
2038
2039         vector = assign_irq_vector(irq, TARGET_CPUS, &tmp);
2040         if (vector >= 0) {
2041                 struct ht_irq_msg msg;
2042                 unsigned dest;
2043
2044                 dest = cpu_mask_to_apicid(tmp);
2045
2046                 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
2047
2048                 msg.address_lo =
2049                         HT_IRQ_LOW_BASE |
2050                         HT_IRQ_LOW_DEST_ID(dest) |
2051                         HT_IRQ_LOW_VECTOR(vector) |
2052                         ((INT_DEST_MODE == 0) ?
2053                                 HT_IRQ_LOW_DM_PHYSICAL :
2054                                 HT_IRQ_LOW_DM_LOGICAL) |
2055                         HT_IRQ_LOW_RQEOI_EDGE |
2056                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2057                                 HT_IRQ_LOW_MT_FIXED :
2058                                 HT_IRQ_LOW_MT_ARBITRATED) |
2059                         HT_IRQ_LOW_IRQ_MASKED;
2060
2061                 write_ht_irq_msg(irq, &msg);
2062
2063                 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2064                                               handle_edge_irq, "edge");
2065         }
2066         return vector;
2067 }
2068 #endif /* CONFIG_HT_IRQ */
2069
2070 /* --------------------------------------------------------------------------
2071                           ACPI-based IOAPIC Configuration
2072    -------------------------------------------------------------------------- */
2073
2074 #ifdef CONFIG_ACPI
2075
2076 #define IO_APIC_MAX_ID          0xFE
2077
2078 int __init io_apic_get_redir_entries (int ioapic)
2079 {
2080         union IO_APIC_reg_01    reg_01;
2081         unsigned long flags;
2082
2083         spin_lock_irqsave(&ioapic_lock, flags);
2084         reg_01.raw = io_apic_read(ioapic, 1);
2085         spin_unlock_irqrestore(&ioapic_lock, flags);
2086
2087         return reg_01.bits.entries;
2088 }
2089
2090
2091 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
2092 {
2093         struct IO_APIC_route_entry entry;
2094         unsigned long flags;
2095         int vector;
2096         cpumask_t mask;
2097
2098         if (!IO_APIC_IRQ(irq)) {
2099                 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2100                         ioapic);
2101                 return -EINVAL;
2102         }
2103
2104         /*
2105          * IRQs < 16 are already in the irq_2_pin[] map
2106          */
2107         if (irq >= 16)
2108                 add_pin_to_irq(irq, ioapic, pin);
2109
2110
2111         vector = assign_irq_vector(irq, TARGET_CPUS, &mask);
2112         if (vector < 0)
2113                 return vector;
2114
2115         /*
2116          * Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
2117          * Note that we mask (disable) IRQs now -- these get enabled when the
2118          * corresponding device driver registers for this IRQ.
2119          */
2120
2121         memset(&entry,0,sizeof(entry));
2122
2123         entry.delivery_mode = INT_DELIVERY_MODE;
2124         entry.dest_mode = INT_DEST_MODE;
2125         entry.dest = cpu_mask_to_apicid(mask);
2126         entry.trigger = triggering;
2127         entry.polarity = polarity;
2128         entry.mask = 1;                                  /* Disabled (masked) */
2129         entry.vector = vector & 0xff;
2130
2131         apic_printk(APIC_VERBOSE,KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry (%d-%d -> 0x%x -> "
2132                 "IRQ %d Mode:%i Active:%i)\n", ioapic, 
2133                mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq,
2134                triggering, polarity);
2135
2136         ioapic_register_intr(irq, entry.vector, triggering);
2137
2138         if (!ioapic && (irq < 16))
2139                 disable_8259A_irq(irq);
2140
2141         ioapic_write_entry(ioapic, pin, entry);
2142
2143         spin_lock_irqsave(&ioapic_lock, flags);
2144         irq_desc[irq].affinity = TARGET_CPUS;
2145         spin_unlock_irqrestore(&ioapic_lock, flags);
2146
2147         return 0;
2148 }
2149
2150 #endif /* CONFIG_ACPI */
2151
2152
2153 /*
2154  * This function currently is only a helper for the i386 smp boot process where
2155  * we need to reprogram the ioredtbls to cater for the cpus which have come online
2156  * so mask in all cases should simply be TARGET_CPUS
2157  */
2158 #ifdef CONFIG_SMP
2159 void __init setup_ioapic_dest(void)
2160 {
2161         int pin, ioapic, irq, irq_entry;
2162
2163         if (skip_ioapic_setup == 1)
2164                 return;
2165
2166         for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
2167                 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
2168                         irq_entry = find_irq_entry(ioapic, pin, mp_INT);
2169                         if (irq_entry == -1)
2170                                 continue;
2171                         irq = pin_2_irq(irq_entry, ioapic, pin);
2172
2173                         /* setup_IO_APIC_irqs could fail to get vector for some device
2174                          * when you have too many devices, because at that time only boot
2175                          * cpu is online.
2176                          */
2177                         if(!irq_vector[irq])
2178                                 setup_IO_APIC_irq(ioapic, pin, irq_entry, irq);
2179                         else
2180                                 set_ioapic_affinity_irq(irq, TARGET_CPUS);
2181                 }
2182
2183         }
2184 }
2185 #endif