Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband
[linux-2.6] / 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/pci.h>
29 #include <linux/mc146818rtc.h>
30 #include <linux/acpi.h>
31 #include <linux/sysdev.h>
32 #include <linux/msi.h>
33 #include <linux/htirq.h>
34 #ifdef CONFIG_ACPI
35 #include <acpi/acpi_bus.h>
36 #endif
37
38 #include <asm/idle.h>
39 #include <asm/io.h>
40 #include <asm/smp.h>
41 #include <asm/desc.h>
42 #include <asm/proto.h>
43 #include <asm/mach_apic.h>
44 #include <asm/acpi.h>
45 #include <asm/dma.h>
46 #include <asm/nmi.h>
47 #include <asm/msidef.h>
48 #include <asm/hypertransport.h>
49
50 struct irq_cfg {
51         cpumask_t domain;
52         cpumask_t old_domain;
53         unsigned move_cleanup_count;
54         u8 vector;
55         u8 move_in_progress : 1;
56 };
57
58 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
59 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
60         [0]  = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR,  },
61         [1]  = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR,  },
62         [2]  = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR,  },
63         [3]  = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR,  },
64         [4]  = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR,  },
65         [5]  = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR,  },
66         [6]  = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR,  },
67         [7]  = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR,  },
68         [8]  = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR,  },
69         [9]  = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR,  },
70         [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
71         [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
72         [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
73         [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
74         [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
75         [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
76 };
77
78 static int assign_irq_vector(int irq, cpumask_t mask);
79
80 #define __apicdebuginit  __init
81
82 int sis_apic_bug; /* not actually supported, dummy for compile */
83
84 static int no_timer_check;
85
86 static int disable_timer_pin_1 __initdata;
87
88 int timer_over_8254 __initdata = 1;
89
90 /* Where if anywhere is the i8259 connect in external int mode */
91 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
92
93 static DEFINE_SPINLOCK(ioapic_lock);
94 DEFINE_SPINLOCK(vector_lock);
95
96 /*
97  * # of IRQ routing registers
98  */
99 int nr_ioapic_registers[MAX_IO_APICS];
100
101 /*
102  * Rough estimation of how many shared IRQs there are, can
103  * be changed anytime.
104  */
105 #define MAX_PLUS_SHARED_IRQS NR_IRQS
106 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
107
108 /*
109  * This is performance-critical, we want to do it O(1)
110  *
111  * the indexing order of this array favors 1:1 mappings
112  * between pins and IRQs.
113  */
114
115 static struct irq_pin_list {
116         short apic, pin, next;
117 } irq_2_pin[PIN_MAP_SIZE];
118
119 struct io_apic {
120         unsigned int index;
121         unsigned int unused[3];
122         unsigned int data;
123 };
124
125 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
126 {
127         return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
128                 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
129 }
130
131 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
132 {
133         struct io_apic __iomem *io_apic = io_apic_base(apic);
134         writel(reg, &io_apic->index);
135         return readl(&io_apic->data);
136 }
137
138 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
139 {
140         struct io_apic __iomem *io_apic = io_apic_base(apic);
141         writel(reg, &io_apic->index);
142         writel(value, &io_apic->data);
143 }
144
145 /*
146  * Re-write a value: to be used for read-modify-write
147  * cycles where the read already set up the index register.
148  */
149 static inline void io_apic_modify(unsigned int apic, unsigned int value)
150 {
151         struct io_apic __iomem *io_apic = io_apic_base(apic);
152         writel(value, &io_apic->data);
153 }
154
155 /*
156  * Synchronize the IO-APIC and the CPU by doing
157  * a dummy read from the IO-APIC
158  */
159 static inline void io_apic_sync(unsigned int apic)
160 {
161         struct io_apic __iomem *io_apic = io_apic_base(apic);
162         readl(&io_apic->data);
163 }
164
165 #define __DO_ACTION(R, ACTION, FINAL)                                   \
166                                                                         \
167 {                                                                       \
168         int pin;                                                        \
169         struct irq_pin_list *entry = irq_2_pin + irq;                   \
170                                                                         \
171         BUG_ON(irq >= NR_IRQS);                                         \
172         for (;;) {                                                      \
173                 unsigned int reg;                                       \
174                 pin = entry->pin;                                       \
175                 if (pin == -1)                                          \
176                         break;                                          \
177                 reg = io_apic_read(entry->apic, 0x10 + R + pin*2);      \
178                 reg ACTION;                                             \
179                 io_apic_modify(entry->apic, reg);                       \
180                 FINAL;                                                  \
181                 if (!entry->next)                                       \
182                         break;                                          \
183                 entry = irq_2_pin + entry->next;                        \
184         }                                                               \
185 }
186
187 union entry_union {
188         struct { u32 w1, w2; };
189         struct IO_APIC_route_entry entry;
190 };
191
192 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
193 {
194         union entry_union eu;
195         unsigned long flags;
196         spin_lock_irqsave(&ioapic_lock, flags);
197         eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
198         eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
199         spin_unlock_irqrestore(&ioapic_lock, flags);
200         return eu.entry;
201 }
202
203 /*
204  * When we write a new IO APIC routing entry, we need to write the high
205  * word first! If the mask bit in the low word is clear, we will enable
206  * the interrupt, and we need to make sure the entry is fully populated
207  * before that happens.
208  */
209 static void
210 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
211 {
212         union entry_union eu;
213         eu.entry = e;
214         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
215         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
216 }
217
218 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
219 {
220         unsigned long flags;
221         spin_lock_irqsave(&ioapic_lock, flags);
222         __ioapic_write_entry(apic, pin, e);
223         spin_unlock_irqrestore(&ioapic_lock, flags);
224 }
225
226 /*
227  * When we mask an IO APIC routing entry, we need to write the low
228  * word first, in order to set the mask bit before we change the
229  * high bits!
230  */
231 static void ioapic_mask_entry(int apic, int pin)
232 {
233         unsigned long flags;
234         union entry_union eu = { .entry.mask = 1 };
235
236         spin_lock_irqsave(&ioapic_lock, flags);
237         io_apic_write(apic, 0x10 + 2*pin, eu.w1);
238         io_apic_write(apic, 0x11 + 2*pin, eu.w2);
239         spin_unlock_irqrestore(&ioapic_lock, flags);
240 }
241
242 #ifdef CONFIG_SMP
243 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
244 {
245         int apic, pin;
246         struct irq_pin_list *entry = irq_2_pin + irq;
247
248         BUG_ON(irq >= NR_IRQS);
249         for (;;) {
250                 unsigned int reg;
251                 apic = entry->apic;
252                 pin = entry->pin;
253                 if (pin == -1)
254                         break;
255                 io_apic_write(apic, 0x11 + pin*2, dest);
256                 reg = io_apic_read(apic, 0x10 + pin*2);
257                 reg &= ~0x000000ff;
258                 reg |= vector;
259                 io_apic_modify(apic, reg);
260                 if (!entry->next)
261                         break;
262                 entry = irq_2_pin + entry->next;
263         }
264 }
265
266 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
267 {
268         struct irq_cfg *cfg = irq_cfg + irq;
269         unsigned long flags;
270         unsigned int dest;
271         cpumask_t tmp;
272
273         cpus_and(tmp, mask, cpu_online_map);
274         if (cpus_empty(tmp))
275                 return;
276
277         if (assign_irq_vector(irq, mask))
278                 return;
279
280         cpus_and(tmp, cfg->domain, mask);
281         dest = cpu_mask_to_apicid(tmp);
282
283         /*
284          * Only the high 8 bits are valid.
285          */
286         dest = SET_APIC_LOGICAL_ID(dest);
287
288         spin_lock_irqsave(&ioapic_lock, flags);
289         __target_IO_APIC_irq(irq, dest, cfg->vector);
290         irq_desc[irq].affinity = mask;
291         spin_unlock_irqrestore(&ioapic_lock, flags);
292 }
293 #endif
294
295 /*
296  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
297  * shared ISA-space IRQs, so we have to support them. We are super
298  * fast in the common case, and fast for shared ISA-space IRQs.
299  */
300 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
301 {
302         static int first_free_entry = NR_IRQS;
303         struct irq_pin_list *entry = irq_2_pin + irq;
304
305         BUG_ON(irq >= NR_IRQS);
306         while (entry->next)
307                 entry = irq_2_pin + entry->next;
308
309         if (entry->pin != -1) {
310                 entry->next = first_free_entry;
311                 entry = irq_2_pin + entry->next;
312                 if (++first_free_entry >= PIN_MAP_SIZE)
313                         panic("io_apic.c: ran out of irq_2_pin entries!");
314         }
315         entry->apic = apic;
316         entry->pin = pin;
317 }
318
319
320 #define DO_ACTION(name,R,ACTION, FINAL)                                 \
321                                                                         \
322         static void name##_IO_APIC_irq (unsigned int irq)               \
323         __DO_ACTION(R, ACTION, FINAL)
324
325 DO_ACTION( __mask,             0, |= 0x00010000, io_apic_sync(entry->apic) )
326                                                 /* mask = 1 */
327 DO_ACTION( __unmask,           0, &= 0xfffeffff, )
328                                                 /* mask = 0 */
329
330 static void mask_IO_APIC_irq (unsigned int irq)
331 {
332         unsigned long flags;
333
334         spin_lock_irqsave(&ioapic_lock, flags);
335         __mask_IO_APIC_irq(irq);
336         spin_unlock_irqrestore(&ioapic_lock, flags);
337 }
338
339 static void unmask_IO_APIC_irq (unsigned int irq)
340 {
341         unsigned long flags;
342
343         spin_lock_irqsave(&ioapic_lock, flags);
344         __unmask_IO_APIC_irq(irq);
345         spin_unlock_irqrestore(&ioapic_lock, flags);
346 }
347
348 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
349 {
350         struct IO_APIC_route_entry entry;
351
352         /* Check delivery_mode to be sure we're not clearing an SMI pin */
353         entry = ioapic_read_entry(apic, pin);
354         if (entry.delivery_mode == dest_SMI)
355                 return;
356         /*
357          * Disable it in the IO-APIC irq-routing table:
358          */
359         ioapic_mask_entry(apic, pin);
360 }
361
362 static void clear_IO_APIC (void)
363 {
364         int apic, pin;
365
366         for (apic = 0; apic < nr_ioapics; apic++)
367                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
368                         clear_IO_APIC_pin(apic, pin);
369 }
370
371 int skip_ioapic_setup;
372 int ioapic_force;
373
374 /* dummy parsing: see setup.c */
375
376 static int __init disable_ioapic_setup(char *str)
377 {
378         skip_ioapic_setup = 1;
379         return 0;
380 }
381 early_param("noapic", disable_ioapic_setup);
382
383 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
384 static int __init disable_timer_pin_setup(char *arg)
385 {
386         disable_timer_pin_1 = 1;
387         return 1;
388 }
389 __setup("disable_timer_pin_1", disable_timer_pin_setup);
390
391 static int __init setup_disable_8254_timer(char *s)
392 {
393         timer_over_8254 = -1;
394         return 1;
395 }
396 static int __init setup_enable_8254_timer(char *s)
397 {
398         timer_over_8254 = 2;
399         return 1;
400 }
401
402 __setup("disable_8254_timer", setup_disable_8254_timer);
403 __setup("enable_8254_timer", setup_enable_8254_timer);
404
405
406 /*
407  * Find the IRQ entry number of a certain pin.
408  */
409 static int find_irq_entry(int apic, int pin, int type)
410 {
411         int i;
412
413         for (i = 0; i < mp_irq_entries; i++)
414                 if (mp_irqs[i].mpc_irqtype == type &&
415                     (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
416                      mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
417                     mp_irqs[i].mpc_dstirq == pin)
418                         return i;
419
420         return -1;
421 }
422
423 /*
424  * Find the pin to which IRQ[irq] (ISA) is connected
425  */
426 static int __init find_isa_irq_pin(int irq, int type)
427 {
428         int i;
429
430         for (i = 0; i < mp_irq_entries; i++) {
431                 int lbus = mp_irqs[i].mpc_srcbus;
432
433                 if (test_bit(lbus, mp_bus_not_pci) &&
434                     (mp_irqs[i].mpc_irqtype == type) &&
435                     (mp_irqs[i].mpc_srcbusirq == irq))
436
437                         return mp_irqs[i].mpc_dstirq;
438         }
439         return -1;
440 }
441
442 static int __init find_isa_irq_apic(int irq, int type)
443 {
444         int i;
445
446         for (i = 0; i < mp_irq_entries; i++) {
447                 int lbus = mp_irqs[i].mpc_srcbus;
448
449                 if (test_bit(lbus, mp_bus_not_pci) &&
450                     (mp_irqs[i].mpc_irqtype == type) &&
451                     (mp_irqs[i].mpc_srcbusirq == irq))
452                         break;
453         }
454         if (i < mp_irq_entries) {
455                 int apic;
456                 for(apic = 0; apic < nr_ioapics; apic++) {
457                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
458                                 return apic;
459                 }
460         }
461
462         return -1;
463 }
464
465 /*
466  * Find a specific PCI IRQ entry.
467  * Not an __init, possibly needed by modules
468  */
469 static int pin_2_irq(int idx, int apic, int pin);
470
471 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
472 {
473         int apic, i, best_guess = -1;
474
475         apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
476                 bus, slot, pin);
477         if (mp_bus_id_to_pci_bus[bus] == -1) {
478                 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
479                 return -1;
480         }
481         for (i = 0; i < mp_irq_entries; i++) {
482                 int lbus = mp_irqs[i].mpc_srcbus;
483
484                 for (apic = 0; apic < nr_ioapics; apic++)
485                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
486                             mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
487                                 break;
488
489                 if (!test_bit(lbus, mp_bus_not_pci) &&
490                     !mp_irqs[i].mpc_irqtype &&
491                     (bus == lbus) &&
492                     (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
493                         int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
494
495                         if (!(apic || IO_APIC_IRQ(irq)))
496                                 continue;
497
498                         if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
499                                 return irq;
500                         /*
501                          * Use the first all-but-pin matching entry as a
502                          * best-guess fuzzy result for broken mptables.
503                          */
504                         if (best_guess < 0)
505                                 best_guess = irq;
506                 }
507         }
508         BUG_ON(best_guess >= NR_IRQS);
509         return best_guess;
510 }
511
512 /* ISA interrupts are always polarity zero edge triggered,
513  * when listed as conforming in the MP table. */
514
515 #define default_ISA_trigger(idx)        (0)
516 #define default_ISA_polarity(idx)       (0)
517
518 /* PCI interrupts are always polarity one level triggered,
519  * when listed as conforming in the MP table. */
520
521 #define default_PCI_trigger(idx)        (1)
522 #define default_PCI_polarity(idx)       (1)
523
524 static int __init MPBIOS_polarity(int idx)
525 {
526         int bus = mp_irqs[idx].mpc_srcbus;
527         int polarity;
528
529         /*
530          * Determine IRQ line polarity (high active or low active):
531          */
532         switch (mp_irqs[idx].mpc_irqflag & 3)
533         {
534                 case 0: /* conforms, ie. bus-type dependent polarity */
535                         if (test_bit(bus, mp_bus_not_pci))
536                                 polarity = default_ISA_polarity(idx);
537                         else
538                                 polarity = default_PCI_polarity(idx);
539                         break;
540                 case 1: /* high active */
541                 {
542                         polarity = 0;
543                         break;
544                 }
545                 case 2: /* reserved */
546                 {
547                         printk(KERN_WARNING "broken BIOS!!\n");
548                         polarity = 1;
549                         break;
550                 }
551                 case 3: /* low active */
552                 {
553                         polarity = 1;
554                         break;
555                 }
556                 default: /* invalid */
557                 {
558                         printk(KERN_WARNING "broken BIOS!!\n");
559                         polarity = 1;
560                         break;
561                 }
562         }
563         return polarity;
564 }
565
566 static int MPBIOS_trigger(int idx)
567 {
568         int bus = mp_irqs[idx].mpc_srcbus;
569         int trigger;
570
571         /*
572          * Determine IRQ trigger mode (edge or level sensitive):
573          */
574         switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
575         {
576                 case 0: /* conforms, ie. bus-type dependent */
577                         if (test_bit(bus, mp_bus_not_pci))
578                                 trigger = default_ISA_trigger(idx);
579                         else
580                                 trigger = default_PCI_trigger(idx);
581                         break;
582                 case 1: /* edge */
583                 {
584                         trigger = 0;
585                         break;
586                 }
587                 case 2: /* reserved */
588                 {
589                         printk(KERN_WARNING "broken BIOS!!\n");
590                         trigger = 1;
591                         break;
592                 }
593                 case 3: /* level */
594                 {
595                         trigger = 1;
596                         break;
597                 }
598                 default: /* invalid */
599                 {
600                         printk(KERN_WARNING "broken BIOS!!\n");
601                         trigger = 0;
602                         break;
603                 }
604         }
605         return trigger;
606 }
607
608 static inline int irq_polarity(int idx)
609 {
610         return MPBIOS_polarity(idx);
611 }
612
613 static inline int irq_trigger(int idx)
614 {
615         return MPBIOS_trigger(idx);
616 }
617
618 static int pin_2_irq(int idx, int apic, int pin)
619 {
620         int irq, i;
621         int bus = mp_irqs[idx].mpc_srcbus;
622
623         /*
624          * Debugging check, we are in big trouble if this message pops up!
625          */
626         if (mp_irqs[idx].mpc_dstirq != pin)
627                 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
628
629         if (test_bit(bus, mp_bus_not_pci)) {
630                 irq = mp_irqs[idx].mpc_srcbusirq;
631         } else {
632                 /*
633                  * PCI IRQs are mapped in order
634                  */
635                 i = irq = 0;
636                 while (i < apic)
637                         irq += nr_ioapic_registers[i++];
638                 irq += pin;
639         }
640         BUG_ON(irq >= NR_IRQS);
641         return irq;
642 }
643
644 static int __assign_irq_vector(int irq, cpumask_t mask)
645 {
646         /*
647          * NOTE! The local APIC isn't very good at handling
648          * multiple interrupts at the same interrupt level.
649          * As the interrupt level is determined by taking the
650          * vector number and shifting that right by 4, we
651          * want to spread these out a bit so that they don't
652          * all fall in the same interrupt level.
653          *
654          * Also, we've got to be careful not to trash gate
655          * 0x80, because int 0x80 is hm, kind of importantish. ;)
656          */
657         static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
658         unsigned int old_vector;
659         int cpu;
660         struct irq_cfg *cfg;
661
662         BUG_ON((unsigned)irq >= NR_IRQS);
663         cfg = &irq_cfg[irq];
664
665         /* Only try and allocate irqs on cpus that are present */
666         cpus_and(mask, mask, cpu_online_map);
667
668         if ((cfg->move_in_progress) || cfg->move_cleanup_count)
669                 return -EBUSY;
670
671         old_vector = cfg->vector;
672         if (old_vector) {
673                 cpumask_t tmp;
674                 cpus_and(tmp, cfg->domain, mask);
675                 if (!cpus_empty(tmp))
676                         return 0;
677         }
678
679         for_each_cpu_mask(cpu, mask) {
680                 cpumask_t domain, new_mask;
681                 int new_cpu;
682                 int vector, offset;
683
684                 domain = vector_allocation_domain(cpu);
685                 cpus_and(new_mask, domain, cpu_online_map);
686
687                 vector = current_vector;
688                 offset = current_offset;
689 next:
690                 vector += 8;
691                 if (vector >= FIRST_SYSTEM_VECTOR) {
692                         /* If we run out of vectors on large boxen, must share them. */
693                         offset = (offset + 1) % 8;
694                         vector = FIRST_DEVICE_VECTOR + offset;
695                 }
696                 if (unlikely(current_vector == vector))
697                         continue;
698                 if (vector == IA32_SYSCALL_VECTOR)
699                         goto next;
700                 for_each_cpu_mask(new_cpu, new_mask)
701                         if (per_cpu(vector_irq, new_cpu)[vector] != -1)
702                                 goto next;
703                 /* Found one! */
704                 current_vector = vector;
705                 current_offset = offset;
706                 if (old_vector) {
707                         cfg->move_in_progress = 1;
708                         cfg->old_domain = cfg->domain;
709                 }
710                 for_each_cpu_mask(new_cpu, new_mask)
711                         per_cpu(vector_irq, new_cpu)[vector] = irq;
712                 cfg->vector = vector;
713                 cfg->domain = domain;
714                 return 0;
715         }
716         return -ENOSPC;
717 }
718
719 static int assign_irq_vector(int irq, cpumask_t mask)
720 {
721         int err;
722         unsigned long flags;
723
724         spin_lock_irqsave(&vector_lock, flags);
725         err = __assign_irq_vector(irq, mask);
726         spin_unlock_irqrestore(&vector_lock, flags);
727         return err;
728 }
729
730 static void __clear_irq_vector(int irq)
731 {
732         struct irq_cfg *cfg;
733         cpumask_t mask;
734         int cpu, vector;
735
736         BUG_ON((unsigned)irq >= NR_IRQS);
737         cfg = &irq_cfg[irq];
738         BUG_ON(!cfg->vector);
739
740         vector = cfg->vector;
741         cpus_and(mask, cfg->domain, cpu_online_map);
742         for_each_cpu_mask(cpu, mask)
743                 per_cpu(vector_irq, cpu)[vector] = -1;
744
745         cfg->vector = 0;
746         cfg->domain = CPU_MASK_NONE;
747 }
748
749 void __setup_vector_irq(int cpu)
750 {
751         /* Initialize vector_irq on a new cpu */
752         /* This function must be called with vector_lock held */
753         int irq, vector;
754
755         /* Mark the inuse vectors */
756         for (irq = 0; irq < NR_IRQS; ++irq) {
757                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
758                         continue;
759                 vector = irq_cfg[irq].vector;
760                 per_cpu(vector_irq, cpu)[vector] = irq;
761         }
762         /* Mark the free vectors */
763         for (vector = 0; vector < NR_VECTORS; ++vector) {
764                 irq = per_cpu(vector_irq, cpu)[vector];
765                 if (irq < 0)
766                         continue;
767                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
768                         per_cpu(vector_irq, cpu)[vector] = -1;
769         }
770 }
771
772
773 static struct irq_chip ioapic_chip;
774
775 static void ioapic_register_intr(int irq, unsigned long trigger)
776 {
777         if (trigger)
778                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
779                                               handle_fasteoi_irq, "fasteoi");
780         else
781                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
782                                               handle_edge_irq, "edge");
783 }
784
785 static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
786                               int trigger, int polarity)
787 {
788         struct irq_cfg *cfg = irq_cfg + irq;
789         struct IO_APIC_route_entry entry;
790         cpumask_t mask;
791
792         if (!IO_APIC_IRQ(irq))
793                 return;
794
795         mask = TARGET_CPUS;
796         if (assign_irq_vector(irq, mask))
797                 return;
798
799         cpus_and(mask, cfg->domain, mask);
800
801         apic_printk(APIC_VERBOSE,KERN_DEBUG
802                     "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
803                     "IRQ %d Mode:%i Active:%i)\n",
804                     apic, mp_ioapics[apic].mpc_apicid, pin, cfg->vector,
805                     irq, trigger, polarity);
806
807         /*
808          * add it to the IO-APIC irq-routing table:
809          */
810         memset(&entry,0,sizeof(entry));
811
812         entry.delivery_mode = INT_DELIVERY_MODE;
813         entry.dest_mode = INT_DEST_MODE;
814         entry.dest = cpu_mask_to_apicid(mask);
815         entry.mask = 0;                         /* enable IRQ */
816         entry.trigger = trigger;
817         entry.polarity = polarity;
818         entry.vector = cfg->vector;
819
820         /* Mask level triggered irqs.
821          * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
822          */
823         if (trigger)
824                 entry.mask = 1;
825
826         ioapic_register_intr(irq, trigger);
827         if (irq < 16)
828                 disable_8259A_irq(irq);
829
830         ioapic_write_entry(apic, pin, entry);
831 }
832
833 static void __init setup_IO_APIC_irqs(void)
834 {
835         int apic, pin, idx, irq, first_notcon = 1;
836
837         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
838
839         for (apic = 0; apic < nr_ioapics; apic++) {
840         for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
841
842                 idx = find_irq_entry(apic,pin,mp_INT);
843                 if (idx == -1) {
844                         if (first_notcon) {
845                                 apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
846                                 first_notcon = 0;
847                         } else
848                                 apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
849                         continue;
850                 }
851
852                 irq = pin_2_irq(idx, apic, pin);
853                 add_pin_to_irq(irq, apic, pin);
854
855                 setup_IO_APIC_irq(apic, pin, irq,
856                                   irq_trigger(idx), irq_polarity(idx));
857         }
858         }
859
860         if (!first_notcon)
861                 apic_printk(APIC_VERBOSE," not connected.\n");
862 }
863
864 /*
865  * Set up the 8259A-master output pin as broadcast to all
866  * CPUs.
867  */
868 static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
869 {
870         struct IO_APIC_route_entry entry;
871         unsigned long flags;
872
873         memset(&entry,0,sizeof(entry));
874
875         disable_8259A_irq(0);
876
877         /* mask LVT0 */
878         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
879
880         /*
881          * We use logical delivery to get the timer IRQ
882          * to the first CPU.
883          */
884         entry.dest_mode = INT_DEST_MODE;
885         entry.mask = 0;                                 /* unmask IRQ now */
886         entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
887         entry.delivery_mode = INT_DELIVERY_MODE;
888         entry.polarity = 0;
889         entry.trigger = 0;
890         entry.vector = vector;
891
892         /*
893          * The timer IRQ doesn't have to know that behind the
894          * scene we have a 8259A-master in AEOI mode ...
895          */
896         set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
897
898         /*
899          * Add it to the IO-APIC irq-routing table:
900          */
901         spin_lock_irqsave(&ioapic_lock, flags);
902         io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
903         io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
904         spin_unlock_irqrestore(&ioapic_lock, flags);
905
906         enable_8259A_irq(0);
907 }
908
909 void __apicdebuginit print_IO_APIC(void)
910 {
911         int apic, i;
912         union IO_APIC_reg_00 reg_00;
913         union IO_APIC_reg_01 reg_01;
914         union IO_APIC_reg_02 reg_02;
915         unsigned long flags;
916
917         if (apic_verbosity == APIC_QUIET)
918                 return;
919
920         printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
921         for (i = 0; i < nr_ioapics; i++)
922                 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
923                        mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
924
925         /*
926          * We are a bit conservative about what we expect.  We have to
927          * know about every hardware change ASAP.
928          */
929         printk(KERN_INFO "testing the IO APIC.......................\n");
930
931         for (apic = 0; apic < nr_ioapics; apic++) {
932
933         spin_lock_irqsave(&ioapic_lock, flags);
934         reg_00.raw = io_apic_read(apic, 0);
935         reg_01.raw = io_apic_read(apic, 1);
936         if (reg_01.bits.version >= 0x10)
937                 reg_02.raw = io_apic_read(apic, 2);
938         spin_unlock_irqrestore(&ioapic_lock, flags);
939
940         printk("\n");
941         printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
942         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
943         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
944
945         printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
946         printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);
947
948         printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
949         printk(KERN_DEBUG ".......     : IO APIC version: %04X\n", reg_01.bits.version);
950
951         if (reg_01.bits.version >= 0x10) {
952                 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
953                 printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
954         }
955
956         printk(KERN_DEBUG ".... IRQ redirection table:\n");
957
958         printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
959                           " Stat Dmod Deli Vect:   \n");
960
961         for (i = 0; i <= reg_01.bits.entries; i++) {
962                 struct IO_APIC_route_entry entry;
963
964                 entry = ioapic_read_entry(apic, i);
965
966                 printk(KERN_DEBUG " %02x %03X ",
967                         i,
968                         entry.dest
969                 );
970
971                 printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
972                         entry.mask,
973                         entry.trigger,
974                         entry.irr,
975                         entry.polarity,
976                         entry.delivery_status,
977                         entry.dest_mode,
978                         entry.delivery_mode,
979                         entry.vector
980                 );
981         }
982         }
983         printk(KERN_DEBUG "IRQ to pin mappings:\n");
984         for (i = 0; i < NR_IRQS; i++) {
985                 struct irq_pin_list *entry = irq_2_pin + i;
986                 if (entry->pin < 0)
987                         continue;
988                 printk(KERN_DEBUG "IRQ%d ", i);
989                 for (;;) {
990                         printk("-> %d:%d", entry->apic, entry->pin);
991                         if (!entry->next)
992                                 break;
993                         entry = irq_2_pin + entry->next;
994                 }
995                 printk("\n");
996         }
997
998         printk(KERN_INFO ".................................... done.\n");
999
1000         return;
1001 }
1002
1003 #if 0
1004
1005 static __apicdebuginit void print_APIC_bitfield (int base)
1006 {
1007         unsigned int v;
1008         int i, j;
1009
1010         if (apic_verbosity == APIC_QUIET)
1011                 return;
1012
1013         printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1014         for (i = 0; i < 8; i++) {
1015                 v = apic_read(base + i*0x10);
1016                 for (j = 0; j < 32; j++) {
1017                         if (v & (1<<j))
1018                                 printk("1");
1019                         else
1020                                 printk("0");
1021                 }
1022                 printk("\n");
1023         }
1024 }
1025
1026 void __apicdebuginit print_local_APIC(void * dummy)
1027 {
1028         unsigned int v, ver, maxlvt;
1029
1030         if (apic_verbosity == APIC_QUIET)
1031                 return;
1032
1033         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1034                 smp_processor_id(), hard_smp_processor_id());
1035         v = apic_read(APIC_ID);
1036         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(v));
1037         v = apic_read(APIC_LVR);
1038         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1039         ver = GET_APIC_VERSION(v);
1040         maxlvt = get_maxlvt();
1041
1042         v = apic_read(APIC_TASKPRI);
1043         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1044
1045         v = apic_read(APIC_ARBPRI);
1046         printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1047                 v & APIC_ARBPRI_MASK);
1048         v = apic_read(APIC_PROCPRI);
1049         printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1050
1051         v = apic_read(APIC_EOI);
1052         printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1053         v = apic_read(APIC_RRR);
1054         printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1055         v = apic_read(APIC_LDR);
1056         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1057         v = apic_read(APIC_DFR);
1058         printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1059         v = apic_read(APIC_SPIV);
1060         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1061
1062         printk(KERN_DEBUG "... APIC ISR field:\n");
1063         print_APIC_bitfield(APIC_ISR);
1064         printk(KERN_DEBUG "... APIC TMR field:\n");
1065         print_APIC_bitfield(APIC_TMR);
1066         printk(KERN_DEBUG "... APIC IRR field:\n");
1067         print_APIC_bitfield(APIC_IRR);
1068
1069         v = apic_read(APIC_ESR);
1070         printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1071
1072         v = apic_read(APIC_ICR);
1073         printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1074         v = apic_read(APIC_ICR2);
1075         printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1076
1077         v = apic_read(APIC_LVTT);
1078         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1079
1080         if (maxlvt > 3) {                       /* PC is LVT#4. */
1081                 v = apic_read(APIC_LVTPC);
1082                 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1083         }
1084         v = apic_read(APIC_LVT0);
1085         printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1086         v = apic_read(APIC_LVT1);
1087         printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1088
1089         if (maxlvt > 2) {                       /* ERR is LVT#3. */
1090                 v = apic_read(APIC_LVTERR);
1091                 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1092         }
1093
1094         v = apic_read(APIC_TMICT);
1095         printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1096         v = apic_read(APIC_TMCCT);
1097         printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1098         v = apic_read(APIC_TDCR);
1099         printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1100         printk("\n");
1101 }
1102
1103 void print_all_local_APICs (void)
1104 {
1105         on_each_cpu(print_local_APIC, NULL, 1, 1);
1106 }
1107
1108 void __apicdebuginit print_PIC(void)
1109 {
1110         unsigned int v;
1111         unsigned long flags;
1112
1113         if (apic_verbosity == APIC_QUIET)
1114                 return;
1115
1116         printk(KERN_DEBUG "\nprinting PIC contents\n");
1117
1118         spin_lock_irqsave(&i8259A_lock, flags);
1119
1120         v = inb(0xa1) << 8 | inb(0x21);
1121         printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
1122
1123         v = inb(0xa0) << 8 | inb(0x20);
1124         printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
1125
1126         outb(0x0b,0xa0);
1127         outb(0x0b,0x20);
1128         v = inb(0xa0) << 8 | inb(0x20);
1129         outb(0x0a,0xa0);
1130         outb(0x0a,0x20);
1131
1132         spin_unlock_irqrestore(&i8259A_lock, flags);
1133
1134         printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
1135
1136         v = inb(0x4d1) << 8 | inb(0x4d0);
1137         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1138 }
1139
1140 #endif  /*  0  */
1141
1142 static void __init enable_IO_APIC(void)
1143 {
1144         union IO_APIC_reg_01 reg_01;
1145         int i8259_apic, i8259_pin;
1146         int i, apic;
1147         unsigned long flags;
1148
1149         for (i = 0; i < PIN_MAP_SIZE; i++) {
1150                 irq_2_pin[i].pin = -1;
1151                 irq_2_pin[i].next = 0;
1152         }
1153
1154         /*
1155          * The number of IO-APIC IRQ registers (== #pins):
1156          */
1157         for (apic = 0; apic < nr_ioapics; apic++) {
1158                 spin_lock_irqsave(&ioapic_lock, flags);
1159                 reg_01.raw = io_apic_read(apic, 1);
1160                 spin_unlock_irqrestore(&ioapic_lock, flags);
1161                 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1162         }
1163         for(apic = 0; apic < nr_ioapics; apic++) {
1164                 int pin;
1165                 /* See if any of the pins is in ExtINT mode */
1166                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1167                         struct IO_APIC_route_entry entry;
1168                         entry = ioapic_read_entry(apic, pin);
1169
1170                         /* If the interrupt line is enabled and in ExtInt mode
1171                          * I have found the pin where the i8259 is connected.
1172                          */
1173                         if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1174                                 ioapic_i8259.apic = apic;
1175                                 ioapic_i8259.pin  = pin;
1176                                 goto found_i8259;
1177                         }
1178                 }
1179         }
1180  found_i8259:
1181         /* Look to see what if the MP table has reported the ExtINT */
1182         i8259_pin  = find_isa_irq_pin(0, mp_ExtINT);
1183         i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1184         /* Trust the MP table if nothing is setup in the hardware */
1185         if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1186                 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1187                 ioapic_i8259.pin  = i8259_pin;
1188                 ioapic_i8259.apic = i8259_apic;
1189         }
1190         /* Complain if the MP table and the hardware disagree */
1191         if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1192                 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1193         {
1194                 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1195         }
1196
1197         /*
1198          * Do not trust the IO-APIC being empty at bootup
1199          */
1200         clear_IO_APIC();
1201 }
1202
1203 /*
1204  * Not an __init, needed by the reboot code
1205  */
1206 void disable_IO_APIC(void)
1207 {
1208         /*
1209          * Clear the IO-APIC before rebooting:
1210          */
1211         clear_IO_APIC();
1212
1213         /*
1214          * If the i8259 is routed through an IOAPIC
1215          * Put that IOAPIC in virtual wire mode
1216          * so legacy interrupts can be delivered.
1217          */
1218         if (ioapic_i8259.pin != -1) {
1219                 struct IO_APIC_route_entry entry;
1220
1221                 memset(&entry, 0, sizeof(entry));
1222                 entry.mask            = 0; /* Enabled */
1223                 entry.trigger         = 0; /* Edge */
1224                 entry.irr             = 0;
1225                 entry.polarity        = 0; /* High */
1226                 entry.delivery_status = 0;
1227                 entry.dest_mode       = 0; /* Physical */
1228                 entry.delivery_mode   = dest_ExtINT; /* ExtInt */
1229                 entry.vector          = 0;
1230                 entry.dest          = GET_APIC_ID(apic_read(APIC_ID));
1231
1232                 /*
1233                  * Add it to the IO-APIC irq-routing table:
1234                  */
1235                 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1236         }
1237
1238         disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1239 }
1240
1241 /*
1242  * There is a nasty bug in some older SMP boards, their mptable lies
1243  * about the timer IRQ. We do the following to work around the situation:
1244  *
1245  *      - timer IRQ defaults to IO-APIC IRQ
1246  *      - if this function detects that timer IRQs are defunct, then we fall
1247  *        back to ISA timer IRQs
1248  */
1249 static int __init timer_irq_works(void)
1250 {
1251         unsigned long t1 = jiffies;
1252
1253         local_irq_enable();
1254         /* Let ten ticks pass... */
1255         mdelay((10 * 1000) / HZ);
1256
1257         /*
1258          * Expect a few ticks at least, to be sure some possible
1259          * glue logic does not lock up after one or two first
1260          * ticks in a non-ExtINT mode.  Also the local APIC
1261          * might have cached one ExtINT interrupt.  Finally, at
1262          * least one tick may be lost due to delays.
1263          */
1264
1265         /* jiffies wrap? */
1266         if (jiffies - t1 > 4)
1267                 return 1;
1268         return 0;
1269 }
1270
1271 /*
1272  * In the SMP+IOAPIC case it might happen that there are an unspecified
1273  * number of pending IRQ events unhandled. These cases are very rare,
1274  * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1275  * better to do it this way as thus we do not have to be aware of
1276  * 'pending' interrupts in the IRQ path, except at this point.
1277  */
1278 /*
1279  * Edge triggered needs to resend any interrupt
1280  * that was delayed but this is now handled in the device
1281  * independent code.
1282  */
1283
1284 /*
1285  * Starting up a edge-triggered IO-APIC interrupt is
1286  * nasty - we need to make sure that we get the edge.
1287  * If it is already asserted for some reason, we need
1288  * return 1 to indicate that is was pending.
1289  *
1290  * This is not complete - we should be able to fake
1291  * an edge even if it isn't on the 8259A...
1292  */
1293
1294 static unsigned int startup_ioapic_irq(unsigned int irq)
1295 {
1296         int was_pending = 0;
1297         unsigned long flags;
1298
1299         spin_lock_irqsave(&ioapic_lock, flags);
1300         if (irq < 16) {
1301                 disable_8259A_irq(irq);
1302                 if (i8259A_irq_pending(irq))
1303                         was_pending = 1;
1304         }
1305         __unmask_IO_APIC_irq(irq);
1306         spin_unlock_irqrestore(&ioapic_lock, flags);
1307
1308         return was_pending;
1309 }
1310
1311 static int ioapic_retrigger_irq(unsigned int irq)
1312 {
1313         struct irq_cfg *cfg = &irq_cfg[irq];
1314         cpumask_t mask;
1315         unsigned long flags;
1316
1317         spin_lock_irqsave(&vector_lock, flags);
1318         cpus_clear(mask);
1319         cpu_set(first_cpu(cfg->domain), mask);
1320
1321         send_IPI_mask(mask, cfg->vector);
1322         spin_unlock_irqrestore(&vector_lock, flags);
1323
1324         return 1;
1325 }
1326
1327 /*
1328  * Level and edge triggered IO-APIC interrupts need different handling,
1329  * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1330  * handled with the level-triggered descriptor, but that one has slightly
1331  * more overhead. Level-triggered interrupts cannot be handled with the
1332  * edge-triggered handler, without risking IRQ storms and other ugly
1333  * races.
1334  */
1335
1336 #ifdef CONFIG_SMP
1337 asmlinkage void smp_irq_move_cleanup_interrupt(void)
1338 {
1339         unsigned vector, me;
1340         ack_APIC_irq();
1341         exit_idle();
1342         irq_enter();
1343
1344         me = smp_processor_id();
1345         for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
1346                 unsigned int irq;
1347                 struct irq_desc *desc;
1348                 struct irq_cfg *cfg;
1349                 irq = __get_cpu_var(vector_irq)[vector];
1350                 if (irq >= NR_IRQS)
1351                         continue;
1352
1353                 desc = irq_desc + irq;
1354                 cfg = irq_cfg + irq;
1355                 spin_lock(&desc->lock);
1356                 if (!cfg->move_cleanup_count)
1357                         goto unlock;
1358
1359                 if ((vector == cfg->vector) && cpu_isset(me, cfg->domain))
1360                         goto unlock;
1361
1362                 __get_cpu_var(vector_irq)[vector] = -1;
1363                 cfg->move_cleanup_count--;
1364 unlock:
1365                 spin_unlock(&desc->lock);
1366         }
1367
1368         irq_exit();
1369 }
1370
1371 static void irq_complete_move(unsigned int irq)
1372 {
1373         struct irq_cfg *cfg = irq_cfg + irq;
1374         unsigned vector, me;
1375
1376         if (likely(!cfg->move_in_progress))
1377                 return;
1378
1379         vector = ~get_irq_regs()->orig_rax;
1380         me = smp_processor_id();
1381         if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) {
1382                 cpumask_t cleanup_mask;
1383
1384                 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
1385                 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
1386                 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
1387                 cfg->move_in_progress = 0;
1388         }
1389 }
1390 #else
1391 static inline void irq_complete_move(unsigned int irq) {}
1392 #endif
1393
1394 static void ack_apic_edge(unsigned int irq)
1395 {
1396         irq_complete_move(irq);
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         irq_complete_move(irq);
1406 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
1407         /* If we are moving the irq we need to mask it */
1408         if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
1409                 do_unmask_irq = 1;
1410                 mask_IO_APIC_irq(irq);
1411         }
1412 #endif
1413
1414         /*
1415          * We must acknowledge the irq before we move it or the acknowledge will
1416          * not propagate properly.
1417          */
1418         ack_APIC_irq();
1419
1420         /* Now we can move and renable the irq */
1421         move_masked_irq(irq);
1422         if (unlikely(do_unmask_irq))
1423                 unmask_IO_APIC_irq(irq);
1424 }
1425
1426 static struct irq_chip ioapic_chip __read_mostly = {
1427         .name           = "IO-APIC",
1428         .startup        = startup_ioapic_irq,
1429         .mask           = mask_IO_APIC_irq,
1430         .unmask         = unmask_IO_APIC_irq,
1431         .ack            = ack_apic_edge,
1432         .eoi            = ack_apic_level,
1433 #ifdef CONFIG_SMP
1434         .set_affinity   = set_ioapic_affinity_irq,
1435 #endif
1436         .retrigger      = ioapic_retrigger_irq,
1437 };
1438
1439 static inline void init_IO_APIC_traps(void)
1440 {
1441         int irq;
1442
1443         /*
1444          * NOTE! The local APIC isn't very good at handling
1445          * multiple interrupts at the same interrupt level.
1446          * As the interrupt level is determined by taking the
1447          * vector number and shifting that right by 4, we
1448          * want to spread these out a bit so that they don't
1449          * all fall in the same interrupt level.
1450          *
1451          * Also, we've got to be careful not to trash gate
1452          * 0x80, because int 0x80 is hm, kind of importantish. ;)
1453          */
1454         for (irq = 0; irq < NR_IRQS ; irq++) {
1455                 int tmp = irq;
1456                 if (IO_APIC_IRQ(tmp) && !irq_cfg[tmp].vector) {
1457                         /*
1458                          * Hmm.. We don't have an entry for this,
1459                          * so default to an old-fashioned 8259
1460                          * interrupt if we can..
1461                          */
1462                         if (irq < 16)
1463                                 make_8259A_irq(irq);
1464                         else
1465                                 /* Strange. Oh, well.. */
1466                                 irq_desc[irq].chip = &no_irq_chip;
1467                 }
1468         }
1469 }
1470
1471 static void enable_lapic_irq (unsigned int irq)
1472 {
1473         unsigned long v;
1474
1475         v = apic_read(APIC_LVT0);
1476         apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1477 }
1478
1479 static void disable_lapic_irq (unsigned int irq)
1480 {
1481         unsigned long v;
1482
1483         v = apic_read(APIC_LVT0);
1484         apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1485 }
1486
1487 static void ack_lapic_irq (unsigned int irq)
1488 {
1489         ack_APIC_irq();
1490 }
1491
1492 static void end_lapic_irq (unsigned int i) { /* nothing */ }
1493
1494 static struct hw_interrupt_type lapic_irq_type __read_mostly = {
1495         .name = "local-APIC",
1496         .typename = "local-APIC-edge",
1497         .startup = NULL, /* startup_irq() not used for IRQ0 */
1498         .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
1499         .enable = enable_lapic_irq,
1500         .disable = disable_lapic_irq,
1501         .ack = ack_lapic_irq,
1502         .end = end_lapic_irq,
1503 };
1504
1505 static void setup_nmi (void)
1506 {
1507         /*
1508          * Dirty trick to enable the NMI watchdog ...
1509          * We put the 8259A master into AEOI mode and
1510          * unmask on all local APICs LVT0 as NMI.
1511          *
1512          * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1513          * is from Maciej W. Rozycki - so we do not have to EOI from
1514          * the NMI handler or the timer interrupt.
1515          */ 
1516         printk(KERN_INFO "activating NMI Watchdog ...");
1517
1518         enable_NMI_through_LVT0(NULL);
1519
1520         printk(" done.\n");
1521 }
1522
1523 /*
1524  * This looks a bit hackish but it's about the only one way of sending
1525  * a few INTA cycles to 8259As and any associated glue logic.  ICR does
1526  * not support the ExtINT mode, unfortunately.  We need to send these
1527  * cycles as some i82489DX-based boards have glue logic that keeps the
1528  * 8259A interrupt line asserted until INTA.  --macro
1529  */
1530 static inline void unlock_ExtINT_logic(void)
1531 {
1532         int apic, pin, i;
1533         struct IO_APIC_route_entry entry0, entry1;
1534         unsigned char save_control, save_freq_select;
1535         unsigned long flags;
1536
1537         pin  = find_isa_irq_pin(8, mp_INT);
1538         apic = find_isa_irq_apic(8, mp_INT);
1539         if (pin == -1)
1540                 return;
1541
1542         spin_lock_irqsave(&ioapic_lock, flags);
1543         *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
1544         *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
1545         spin_unlock_irqrestore(&ioapic_lock, flags);
1546         clear_IO_APIC_pin(apic, pin);
1547
1548         memset(&entry1, 0, sizeof(entry1));
1549
1550         entry1.dest_mode = 0;                   /* physical delivery */
1551         entry1.mask = 0;                        /* unmask IRQ now */
1552         entry1.dest = hard_smp_processor_id();
1553         entry1.delivery_mode = dest_ExtINT;
1554         entry1.polarity = entry0.polarity;
1555         entry1.trigger = 0;
1556         entry1.vector = 0;
1557
1558         spin_lock_irqsave(&ioapic_lock, flags);
1559         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
1560         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
1561         spin_unlock_irqrestore(&ioapic_lock, flags);
1562
1563         save_control = CMOS_READ(RTC_CONTROL);
1564         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1565         CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
1566                    RTC_FREQ_SELECT);
1567         CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
1568
1569         i = 100;
1570         while (i-- > 0) {
1571                 mdelay(10);
1572                 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
1573                         i -= 10;
1574         }
1575
1576         CMOS_WRITE(save_control, RTC_CONTROL);
1577         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1578         clear_IO_APIC_pin(apic, pin);
1579
1580         spin_lock_irqsave(&ioapic_lock, flags);
1581         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
1582         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
1583         spin_unlock_irqrestore(&ioapic_lock, flags);
1584 }
1585
1586 /*
1587  * This code may look a bit paranoid, but it's supposed to cooperate with
1588  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
1589  * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
1590  * fanatically on his truly buggy board.
1591  *
1592  * FIXME: really need to revamp this for modern platforms only.
1593  */
1594 static inline void check_timer(void)
1595 {
1596         struct irq_cfg *cfg = irq_cfg + 0;
1597         int apic1, pin1, apic2, pin2;
1598
1599         /*
1600          * get/set the timer IRQ vector:
1601          */
1602         disable_8259A_irq(0);
1603         assign_irq_vector(0, TARGET_CPUS);
1604
1605         /*
1606          * Subtle, code in do_timer_interrupt() expects an AEOI
1607          * mode for the 8259A whenever interrupts are routed
1608          * through I/O APICs.  Also IRQ0 has to be enabled in
1609          * the 8259A which implies the virtual wire has to be
1610          * disabled in the local APIC.
1611          */
1612         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1613         init_8259A(1);
1614         if (timer_over_8254 > 0)
1615                 enable_8259A_irq(0);
1616
1617         pin1  = find_isa_irq_pin(0, mp_INT);
1618         apic1 = find_isa_irq_apic(0, mp_INT);
1619         pin2  = ioapic_i8259.pin;
1620         apic2 = ioapic_i8259.apic;
1621
1622         apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
1623                 cfg->vector, apic1, pin1, apic2, pin2);
1624
1625         if (pin1 != -1) {
1626                 /*
1627                  * Ok, does IRQ0 through the IOAPIC work?
1628                  */
1629                 unmask_IO_APIC_irq(0);
1630                 if (!no_timer_check && timer_irq_works()) {
1631                         nmi_watchdog_default();
1632                         if (nmi_watchdog == NMI_IO_APIC) {
1633                                 disable_8259A_irq(0);
1634                                 setup_nmi();
1635                                 enable_8259A_irq(0);
1636                         }
1637                         if (disable_timer_pin_1 > 0)
1638                                 clear_IO_APIC_pin(0, pin1);
1639                         return;
1640                 }
1641                 clear_IO_APIC_pin(apic1, pin1);
1642                 apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
1643                                 "connected to IO-APIC\n");
1644         }
1645
1646         apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
1647                                 "through the 8259A ... ");
1648         if (pin2 != -1) {
1649                 apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
1650                         apic2, pin2);
1651                 /*
1652                  * legacy devices should be connected to IO APIC #0
1653                  */
1654                 setup_ExtINT_IRQ0_pin(apic2, pin2, cfg->vector);
1655                 if (timer_irq_works()) {
1656                         apic_printk(APIC_VERBOSE," works.\n");
1657                         nmi_watchdog_default();
1658                         if (nmi_watchdog == NMI_IO_APIC) {
1659                                 setup_nmi();
1660                         }
1661                         return;
1662                 }
1663                 /*
1664                  * Cleanup, just in case ...
1665                  */
1666                 clear_IO_APIC_pin(apic2, pin2);
1667         }
1668         apic_printk(APIC_VERBOSE," failed.\n");
1669
1670         if (nmi_watchdog == NMI_IO_APIC) {
1671                 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1672                 nmi_watchdog = 0;
1673         }
1674
1675         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
1676
1677         disable_8259A_irq(0);
1678         irq_desc[0].chip = &lapic_irq_type;
1679         apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector);     /* Fixed mode */
1680         enable_8259A_irq(0);
1681
1682         if (timer_irq_works()) {
1683                 apic_printk(APIC_VERBOSE," works.\n");
1684                 return;
1685         }
1686         apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
1687         apic_printk(APIC_VERBOSE," failed.\n");
1688
1689         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
1690
1691         init_8259A(0);
1692         make_8259A_irq(0);
1693         apic_write(APIC_LVT0, APIC_DM_EXTINT);
1694
1695         unlock_ExtINT_logic();
1696
1697         if (timer_irq_works()) {
1698                 apic_printk(APIC_VERBOSE," works.\n");
1699                 return;
1700         }
1701         apic_printk(APIC_VERBOSE," failed :(.\n");
1702         panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1703 }
1704
1705 static int __init notimercheck(char *s)
1706 {
1707         no_timer_check = 1;
1708         return 1;
1709 }
1710 __setup("no_timer_check", notimercheck);
1711
1712 /*
1713  *
1714  * IRQ's that are handled by the PIC in the MPS IOAPIC case.
1715  * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1716  *   Linux doesn't really care, as it's not actually used
1717  *   for any interrupt handling anyway.
1718  */
1719 #define PIC_IRQS        (1<<2)
1720
1721 void __init setup_IO_APIC(void)
1722 {
1723         enable_IO_APIC();
1724
1725         if (acpi_ioapic)
1726                 io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
1727         else
1728                 io_apic_irqs = ~PIC_IRQS;
1729
1730         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
1731
1732         sync_Arb_IDs();
1733         setup_IO_APIC_irqs();
1734         init_IO_APIC_traps();
1735         check_timer();
1736         if (!acpi_ioapic)
1737                 print_IO_APIC();
1738 }
1739
1740 struct sysfs_ioapic_data {
1741         struct sys_device dev;
1742         struct IO_APIC_route_entry entry[0];
1743 };
1744 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
1745
1746 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
1747 {
1748         struct IO_APIC_route_entry *entry;
1749         struct sysfs_ioapic_data *data;
1750         int i;
1751
1752         data = container_of(dev, struct sysfs_ioapic_data, dev);
1753         entry = data->entry;
1754         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
1755                 *entry = ioapic_read_entry(dev->id, i);
1756
1757         return 0;
1758 }
1759
1760 static int ioapic_resume(struct sys_device *dev)
1761 {
1762         struct IO_APIC_route_entry *entry;
1763         struct sysfs_ioapic_data *data;
1764         unsigned long flags;
1765         union IO_APIC_reg_00 reg_00;
1766         int i;
1767
1768         data = container_of(dev, struct sysfs_ioapic_data, dev);
1769         entry = data->entry;
1770
1771         spin_lock_irqsave(&ioapic_lock, flags);
1772         reg_00.raw = io_apic_read(dev->id, 0);
1773         if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
1774                 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
1775                 io_apic_write(dev->id, 0, reg_00.raw);
1776         }
1777         spin_unlock_irqrestore(&ioapic_lock, flags);
1778         for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
1779                 ioapic_write_entry(dev->id, i, entry[i]);
1780
1781         return 0;
1782 }
1783
1784 static struct sysdev_class ioapic_sysdev_class = {
1785         set_kset_name("ioapic"),
1786         .suspend = ioapic_suspend,
1787         .resume = ioapic_resume,
1788 };
1789
1790 static int __init ioapic_init_sysfs(void)
1791 {
1792         struct sys_device * dev;
1793         int i, size, error = 0;
1794
1795         error = sysdev_class_register(&ioapic_sysdev_class);
1796         if (error)
1797                 return error;
1798
1799         for (i = 0; i < nr_ioapics; i++ ) {
1800                 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
1801                         * sizeof(struct IO_APIC_route_entry);
1802                 mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
1803                 if (!mp_ioapic_data[i]) {
1804                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1805                         continue;
1806                 }
1807                 memset(mp_ioapic_data[i], 0, size);
1808                 dev = &mp_ioapic_data[i]->dev;
1809                 dev->id = i;
1810                 dev->cls = &ioapic_sysdev_class;
1811                 error = sysdev_register(dev);
1812                 if (error) {
1813                         kfree(mp_ioapic_data[i]);
1814                         mp_ioapic_data[i] = NULL;
1815                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1816                         continue;
1817                 }
1818         }
1819
1820         return 0;
1821 }
1822
1823 device_initcall(ioapic_init_sysfs);
1824
1825 /*
1826  * Dynamic irq allocate and deallocation
1827  */
1828 int create_irq(void)
1829 {
1830         /* Allocate an unused irq */
1831         int irq;
1832         int new;
1833         unsigned long flags;
1834
1835         irq = -ENOSPC;
1836         spin_lock_irqsave(&vector_lock, flags);
1837         for (new = (NR_IRQS - 1); new >= 0; new--) {
1838                 if (platform_legacy_irq(new))
1839                         continue;
1840                 if (irq_cfg[new].vector != 0)
1841                         continue;
1842                 if (__assign_irq_vector(new, TARGET_CPUS) == 0)
1843                         irq = new;
1844                 break;
1845         }
1846         spin_unlock_irqrestore(&vector_lock, flags);
1847
1848         if (irq >= 0) {
1849                 dynamic_irq_init(irq);
1850         }
1851         return irq;
1852 }
1853
1854 void destroy_irq(unsigned int irq)
1855 {
1856         unsigned long flags;
1857
1858         dynamic_irq_cleanup(irq);
1859
1860         spin_lock_irqsave(&vector_lock, flags);
1861         __clear_irq_vector(irq);
1862         spin_unlock_irqrestore(&vector_lock, flags);
1863 }
1864
1865 /*
1866  * MSI mesage composition
1867  */
1868 #ifdef CONFIG_PCI_MSI
1869 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
1870 {
1871         struct irq_cfg *cfg = irq_cfg + irq;
1872         int err;
1873         unsigned dest;
1874         cpumask_t tmp;
1875
1876         tmp = TARGET_CPUS;
1877         err = assign_irq_vector(irq, tmp);
1878         if (!err) {
1879                 cpus_and(tmp, cfg->domain, tmp);
1880                 dest = cpu_mask_to_apicid(tmp);
1881
1882                 msg->address_hi = MSI_ADDR_BASE_HI;
1883                 msg->address_lo =
1884                         MSI_ADDR_BASE_LO |
1885                         ((INT_DEST_MODE == 0) ?
1886                                 MSI_ADDR_DEST_MODE_PHYSICAL:
1887                                 MSI_ADDR_DEST_MODE_LOGICAL) |
1888                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1889                                 MSI_ADDR_REDIRECTION_CPU:
1890                                 MSI_ADDR_REDIRECTION_LOWPRI) |
1891                         MSI_ADDR_DEST_ID(dest);
1892
1893                 msg->data =
1894                         MSI_DATA_TRIGGER_EDGE |
1895                         MSI_DATA_LEVEL_ASSERT |
1896                         ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1897                                 MSI_DATA_DELIVERY_FIXED:
1898                                 MSI_DATA_DELIVERY_LOWPRI) |
1899                         MSI_DATA_VECTOR(cfg->vector);
1900         }
1901         return err;
1902 }
1903
1904 #ifdef CONFIG_SMP
1905 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
1906 {
1907         struct irq_cfg *cfg = irq_cfg + irq;
1908         struct msi_msg msg;
1909         unsigned int dest;
1910         cpumask_t tmp;
1911
1912         cpus_and(tmp, mask, cpu_online_map);
1913         if (cpus_empty(tmp))
1914                 return;
1915
1916         if (assign_irq_vector(irq, mask))
1917                 return;
1918
1919         cpus_and(tmp, cfg->domain, mask);
1920         dest = cpu_mask_to_apicid(tmp);
1921
1922         read_msi_msg(irq, &msg);
1923
1924         msg.data &= ~MSI_DATA_VECTOR_MASK;
1925         msg.data |= MSI_DATA_VECTOR(cfg->vector);
1926         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
1927         msg.address_lo |= MSI_ADDR_DEST_ID(dest);
1928
1929         write_msi_msg(irq, &msg);
1930         irq_desc[irq].affinity = mask;
1931 }
1932 #endif /* CONFIG_SMP */
1933
1934 /*
1935  * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
1936  * which implement the MSI or MSI-X Capability Structure.
1937  */
1938 static struct irq_chip msi_chip = {
1939         .name           = "PCI-MSI",
1940         .unmask         = unmask_msi_irq,
1941         .mask           = mask_msi_irq,
1942         .ack            = ack_apic_edge,
1943 #ifdef CONFIG_SMP
1944         .set_affinity   = set_msi_irq_affinity,
1945 #endif
1946         .retrigger      = ioapic_retrigger_irq,
1947 };
1948
1949 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
1950 {
1951         struct msi_msg msg;
1952         int irq, ret;
1953         irq = create_irq();
1954         if (irq < 0)
1955                 return irq;
1956
1957         ret = msi_compose_msg(dev, irq, &msg);
1958         if (ret < 0) {
1959                 destroy_irq(irq);
1960                 return ret;
1961         }
1962
1963         set_irq_msi(irq, desc);
1964         write_msi_msg(irq, &msg);
1965
1966         set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
1967
1968         return 0;
1969 }
1970
1971 void arch_teardown_msi_irq(unsigned int irq)
1972 {
1973         destroy_irq(irq);
1974 }
1975
1976 #endif /* CONFIG_PCI_MSI */
1977
1978 /*
1979  * Hypertransport interrupt support
1980  */
1981 #ifdef CONFIG_HT_IRQ
1982
1983 #ifdef CONFIG_SMP
1984
1985 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
1986 {
1987         struct ht_irq_msg msg;
1988         fetch_ht_irq_msg(irq, &msg);
1989
1990         msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
1991         msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
1992
1993         msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
1994         msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
1995
1996         write_ht_irq_msg(irq, &msg);
1997 }
1998
1999 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2000 {
2001         struct irq_cfg *cfg = irq_cfg + irq;
2002         unsigned int dest;
2003         cpumask_t tmp;
2004
2005         cpus_and(tmp, mask, cpu_online_map);
2006         if (cpus_empty(tmp))
2007                 return;
2008
2009         if (assign_irq_vector(irq, mask))
2010                 return;
2011
2012         cpus_and(tmp, cfg->domain, mask);
2013         dest = cpu_mask_to_apicid(tmp);
2014
2015         target_ht_irq(irq, dest, cfg->vector);
2016         irq_desc[irq].affinity = mask;
2017 }
2018 #endif
2019
2020 static struct irq_chip ht_irq_chip = {
2021         .name           = "PCI-HT",
2022         .mask           = mask_ht_irq,
2023         .unmask         = unmask_ht_irq,
2024         .ack            = ack_apic_edge,
2025 #ifdef CONFIG_SMP
2026         .set_affinity   = set_ht_irq_affinity,
2027 #endif
2028         .retrigger      = ioapic_retrigger_irq,
2029 };
2030
2031 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2032 {
2033         struct irq_cfg *cfg = irq_cfg + irq;
2034         int err;
2035         cpumask_t tmp;
2036
2037         tmp = TARGET_CPUS;
2038         err = assign_irq_vector(irq, tmp);
2039         if (!err) {
2040                 struct ht_irq_msg msg;
2041                 unsigned dest;
2042
2043                 cpus_and(tmp, cfg->domain, tmp);
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(cfg->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 err;
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         if (!IO_APIC_IRQ(irq)) {
2094                 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2095                         ioapic);
2096                 return -EINVAL;
2097         }
2098
2099         /*
2100          * IRQs < 16 are already in the irq_2_pin[] map
2101          */
2102         if (irq >= 16)
2103                 add_pin_to_irq(irq, ioapic, pin);
2104
2105         setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
2106
2107         return 0;
2108 }
2109
2110 #endif /* CONFIG_ACPI */
2111
2112
2113 /*
2114  * This function currently is only a helper for the i386 smp boot process where
2115  * we need to reprogram the ioredtbls to cater for the cpus which have come online
2116  * so mask in all cases should simply be TARGET_CPUS
2117  */
2118 #ifdef CONFIG_SMP
2119 void __init setup_ioapic_dest(void)
2120 {
2121         int pin, ioapic, irq, irq_entry;
2122
2123         if (skip_ioapic_setup == 1)
2124                 return;
2125
2126         for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
2127                 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
2128                         irq_entry = find_irq_entry(ioapic, pin, mp_INT);
2129                         if (irq_entry == -1)
2130                                 continue;
2131                         irq = pin_2_irq(irq_entry, ioapic, pin);
2132
2133                         /* setup_IO_APIC_irqs could fail to get vector for some device
2134                          * when you have too many devices, because at that time only boot
2135                          * cpu is online.
2136                          */
2137                         if (!irq_cfg[irq].vector)
2138                                 setup_IO_APIC_irq(ioapic, pin, irq,
2139                                                   irq_trigger(irq_entry),
2140                                                   irq_polarity(irq_entry));
2141                         else
2142                                 set_ioapic_affinity_irq(irq, TARGET_CPUS);
2143                 }
2144
2145         }
2146 }
2147 #endif