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airport: remove useless return in a function returning void
[linux/fpc-iii.git] / arch / x86 / kernel / io_apic.c
blob9043251210fba4dc32ea7db009a1db6196216453
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/compiler.h>
31 #include <linux/acpi.h>
32 #include <linux/module.h>
33 #include <linux/sysdev.h>
34 #include <linux/msi.h>
35 #include <linux/htirq.h>
36 #include <linux/freezer.h>
37 #include <linux/kthread.h>
38 #include <linux/jiffies.h> /* time_after() */
39 #ifdef CONFIG_ACPI
40 #include <acpi/acpi_bus.h>
41 #endif
42 #include <linux/bootmem.h>
43 #include <linux/dmar.h>
44 #include <linux/hpet.h>
45
46 #include <asm/idle.h>
47 #include <asm/io.h>
48 #include <asm/smp.h>
49 #include <asm/desc.h>
50 #include <asm/proto.h>
51 #include <asm/acpi.h>
52 #include <asm/dma.h>
53 #include <asm/timer.h>
54 #include <asm/i8259.h>
55 #include <asm/nmi.h>
56 #include <asm/msidef.h>
57 #include <asm/hypertransport.h>
58 #include <asm/setup.h>
59 #include <asm/irq_remapping.h>
60 #include <asm/hpet.h>
61 #include <asm/uv/uv_hub.h>
62 #include <asm/uv/uv_irq.h>
63
64 #include <mach_ipi.h>
65 #include <mach_apic.h>
66 #include <mach_apicdef.h>
67
68 #define __apicdebuginit(type) static type __init
69
70 /*
71 * Is the SiS APIC rmw bug present ?
72 * -1 = don't know, 0 = no, 1 = yes
73 */
74 int sis_apic_bug = -1;
75
76 static DEFINE_SPINLOCK(ioapic_lock);
77 static DEFINE_SPINLOCK(vector_lock);
78
79 /*
80 * # of IRQ routing registers
81 */
82 int nr_ioapic_registers[MAX_IO_APICS];
83
84 /* I/O APIC entries */
85 struct mp_config_ioapic mp_ioapics[MAX_IO_APICS];
86 int nr_ioapics;
87
88 /* MP IRQ source entries */
89 struct mp_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
90
91 /* # of MP IRQ source entries */
92 int mp_irq_entries;
93
94 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
95 int mp_bus_id_to_type[MAX_MP_BUSSES];
96 #endif
97
98 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
99
100 int skip_ioapic_setup;
101
102 static int __init parse_noapic(char *str)
103 {
104 /* disable IO-APIC */
105 disable_ioapic_setup();
106 return 0;
107 }
108 early_param("noapic", parse_noapic);
109
110 struct irq_pin_list;
111 struct irq_cfg {
112 unsigned int irq;
113 struct irq_pin_list *irq_2_pin;
114 cpumask_t domain;
115 cpumask_t old_domain;
116 unsigned move_cleanup_count;
117 u8 vector;
118 u8 move_in_progress : 1;
119 };
120
121 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
122 static struct irq_cfg irq_cfgx[NR_IRQS] = {
123 [0] = { .irq = 0, .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, },
124 [1] = { .irq = 1, .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, },
125 [2] = { .irq = 2, .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, },
126 [3] = { .irq = 3, .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR, },
127 [4] = { .irq = 4, .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR, },
128 [5] = { .irq = 5, .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR, },
129 [6] = { .irq = 6, .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR, },
130 [7] = { .irq = 7, .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR, },
131 [8] = { .irq = 8, .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR, },
132 [9] = { .irq = 9, .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR, },
133 [10] = { .irq = 10, .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
134 [11] = { .irq = 11, .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
135 [12] = { .irq = 12, .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
136 [13] = { .irq = 13, .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
137 [14] = { .irq = 14, .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
138 [15] = { .irq = 15, .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
139 };
140
141 #define for_each_irq_cfg(irq, cfg) \
142 for (irq = 0, cfg = irq_cfgx; irq < nr_irqs; irq++, cfg++)
143
144 static struct irq_cfg *irq_cfg(unsigned int irq)
145 {
146 return irq < nr_irqs ? irq_cfgx + irq : NULL;
147 }
148
149 static struct irq_cfg *irq_cfg_alloc(unsigned int irq)
150 {
151 return irq_cfg(irq);
152 }
153
154 /*
155 * Rough estimation of how many shared IRQs there are, can be changed
156 * anytime.
157 */
158 #define MAX_PLUS_SHARED_IRQS NR_IRQS
159 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
160
161 /*
162 * This is performance-critical, we want to do it O(1)
163 *
164 * the indexing order of this array favors 1:1 mappings
165 * between pins and IRQs.
166 */
167
168 struct irq_pin_list {
169 int apic, pin;
170 struct irq_pin_list *next;
171 };
172
173 static struct irq_pin_list irq_2_pin_head[PIN_MAP_SIZE];
174 static struct irq_pin_list *irq_2_pin_ptr;
175
176 static void __init irq_2_pin_init(void)
177 {
178 struct irq_pin_list *pin = irq_2_pin_head;
179 int i;
180
181 for (i = 1; i < PIN_MAP_SIZE; i++)
182 pin[i-1].next = &pin[i];
183
184 irq_2_pin_ptr = &pin[0];
185 }
186
187 static struct irq_pin_list *get_one_free_irq_2_pin(void)
188 {
189 struct irq_pin_list *pin = irq_2_pin_ptr;
190
191 if (!pin)
192 panic("can not get more irq_2_pin\n");
193
194 irq_2_pin_ptr = pin->next;
195 pin->next = NULL;
196 return pin;
197 }
198
199 struct io_apic {
200 unsigned int index;
201 unsigned int unused[3];
202 unsigned int data;
203 };
204
205 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
206 {
207 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
208 + (mp_ioapics[idx].mp_apicaddr & ~PAGE_MASK);
209 }
210
211 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
212 {
213 struct io_apic __iomem *io_apic = io_apic_base(apic);
214 writel(reg, &io_apic->index);
215 return readl(&io_apic->data);
216 }
217
218 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
219 {
220 struct io_apic __iomem *io_apic = io_apic_base(apic);
221 writel(reg, &io_apic->index);
222 writel(value, &io_apic->data);
223 }
224
225 /*
226 * Re-write a value: to be used for read-modify-write
227 * cycles where the read already set up the index register.
228 *
229 * Older SiS APIC requires we rewrite the index register
230 */
231 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
232 {
233 struct io_apic __iomem *io_apic = io_apic_base(apic);
234
235 if (sis_apic_bug)
236 writel(reg, &io_apic->index);
237 writel(value, &io_apic->data);
238 }
239
240 static bool io_apic_level_ack_pending(unsigned int irq)
241 {
242 struct irq_pin_list *entry;
243 unsigned long flags;
244 struct irq_cfg *cfg = irq_cfg(irq);
245
246 spin_lock_irqsave(&ioapic_lock, flags);
247 entry = cfg->irq_2_pin;
248 for (;;) {
249 unsigned int reg;
250 int pin;
251
252 if (!entry)
253 break;
254 pin = entry->pin;
255 reg = io_apic_read(entry->apic, 0x10 + pin*2);
256 /* Is the remote IRR bit set? */
257 if (reg & IO_APIC_REDIR_REMOTE_IRR) {
258 spin_unlock_irqrestore(&ioapic_lock, flags);
259 return true;
260 }
261 if (!entry->next)
262 break;
263 entry = entry->next;
264 }
265 spin_unlock_irqrestore(&ioapic_lock, flags);
266
267 return false;
268 }
269
270 union entry_union {
271 struct { u32 w1, w2; };
272 struct IO_APIC_route_entry entry;
273 };
274
275 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
276 {
277 union entry_union eu;
278 unsigned long flags;
279 spin_lock_irqsave(&ioapic_lock, flags);
280 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
281 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
282 spin_unlock_irqrestore(&ioapic_lock, flags);
283 return eu.entry;
284 }
285
286 /*
287 * When we write a new IO APIC routing entry, we need to write the high
288 * word first! If the mask bit in the low word is clear, we will enable
289 * the interrupt, and we need to make sure the entry is fully populated
290 * before that happens.
291 */
292 static void
293 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
294 {
295 union entry_union eu;
296 eu.entry = e;
297 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
298 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
299 }
300
301 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
302 {
303 unsigned long flags;
304 spin_lock_irqsave(&ioapic_lock, flags);
305 __ioapic_write_entry(apic, pin, e);
306 spin_unlock_irqrestore(&ioapic_lock, flags);
307 }
308
309 /*
310 * When we mask an IO APIC routing entry, we need to write the low
311 * word first, in order to set the mask bit before we change the
312 * high bits!
313 */
314 static void ioapic_mask_entry(int apic, int pin)
315 {
316 unsigned long flags;
317 union entry_union eu = { .entry.mask = 1 };
318
319 spin_lock_irqsave(&ioapic_lock, flags);
320 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
321 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
322 spin_unlock_irqrestore(&ioapic_lock, flags);
323 }
324
325 #ifdef CONFIG_SMP
326 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
327 {
328 int apic, pin;
329 struct irq_cfg *cfg;
330 struct irq_pin_list *entry;
331
332 cfg = irq_cfg(irq);
333 entry = cfg->irq_2_pin;
334 for (;;) {
335 unsigned int reg;
336
337 if (!entry)
338 break;
339
340 apic = entry->apic;
341 pin = entry->pin;
342 #ifdef CONFIG_INTR_REMAP
343 /*
344 * With interrupt-remapping, destination information comes
345 * from interrupt-remapping table entry.
346 */
347 if (!irq_remapped(irq))
348 io_apic_write(apic, 0x11 + pin*2, dest);
349 #else
350 io_apic_write(apic, 0x11 + pin*2, dest);
351 #endif
352 reg = io_apic_read(apic, 0x10 + pin*2);
353 reg &= ~IO_APIC_REDIR_VECTOR_MASK;
354 reg |= vector;
355 io_apic_modify(apic, 0x10 + pin*2, reg);
356 if (!entry->next)
357 break;
358 entry = entry->next;
359 }
360 }
361
362 static int assign_irq_vector(int irq, cpumask_t mask);
363
364 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
365 {
366 struct irq_cfg *cfg;
367 unsigned long flags;
368 unsigned int dest;
369 cpumask_t tmp;
370 struct irq_desc *desc;
371
372 cpus_and(tmp, mask, cpu_online_map);
373 if (cpus_empty(tmp))
374 return;
375
376 cfg = irq_cfg(irq);
377 if (assign_irq_vector(irq, mask))
378 return;
379
380 cpus_and(tmp, cfg->domain, mask);
381 dest = cpu_mask_to_apicid(tmp);
382 /*
383 * Only the high 8 bits are valid.
384 */
385 dest = SET_APIC_LOGICAL_ID(dest);
386
387 desc = irq_to_desc(irq);
388 spin_lock_irqsave(&ioapic_lock, flags);
389 __target_IO_APIC_irq(irq, dest, cfg->vector);
390 desc->affinity = mask;
391 spin_unlock_irqrestore(&ioapic_lock, flags);
392 }
393 #endif /* CONFIG_SMP */
394
395 /*
396 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
397 * shared ISA-space IRQs, so we have to support them. We are super
398 * fast in the common case, and fast for shared ISA-space IRQs.
399 */
400 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
401 {
402 struct irq_cfg *cfg;
403 struct irq_pin_list *entry;
404
405 /* first time to refer irq_cfg, so with new */
406 cfg = irq_cfg_alloc(irq);
407 entry = cfg->irq_2_pin;
408 if (!entry) {
409 entry = get_one_free_irq_2_pin();
410 cfg->irq_2_pin = entry;
411 entry->apic = apic;
412 entry->pin = pin;
413 return;
414 }
415
416 while (entry->next) {
417 /* not again, please */
418 if (entry->apic == apic && entry->pin == pin)
419 return;
420
421 entry = entry->next;
422 }
423
424 entry->next = get_one_free_irq_2_pin();
425 entry = entry->next;
426 entry->apic = apic;
427 entry->pin = pin;
428 }
429
430 /*
431 * Reroute an IRQ to a different pin.
432 */
433 static void __init replace_pin_at_irq(unsigned int irq,
434 int oldapic, int oldpin,
435 int newapic, int newpin)
436 {
437 struct irq_cfg *cfg = irq_cfg(irq);
438 struct irq_pin_list *entry = cfg->irq_2_pin;
439 int replaced = 0;
440
441 while (entry) {
442 if (entry->apic == oldapic && entry->pin == oldpin) {
443 entry->apic = newapic;
444 entry->pin = newpin;
445 replaced = 1;
446 /* every one is different, right? */
447 break;
448 }
449 entry = entry->next;
450 }
451
452 /* why? call replace before add? */
453 if (!replaced)
454 add_pin_to_irq(irq, newapic, newpin);
455 }
456
457 static inline void io_apic_modify_irq(unsigned int irq,
458 int mask_and, int mask_or,
459 void (*final)(struct irq_pin_list *entry))
460 {
461 int pin;
462 struct irq_cfg *cfg;
463 struct irq_pin_list *entry;
464
465 cfg = irq_cfg(irq);
466 for (entry = cfg->irq_2_pin; entry != NULL; entry = entry->next) {
467 unsigned int reg;
468 pin = entry->pin;
469 reg = io_apic_read(entry->apic, 0x10 + pin * 2);
470 reg &= mask_and;
471 reg |= mask_or;
472 io_apic_modify(entry->apic, 0x10 + pin * 2, reg);
473 if (final)
474 final(entry);
475 }
476 }
477
478 static void __unmask_IO_APIC_irq(unsigned int irq)
479 {
480 io_apic_modify_irq(irq, ~IO_APIC_REDIR_MASKED, 0, NULL);
481 }
482
483 #ifdef CONFIG_X86_64
484 void io_apic_sync(struct irq_pin_list *entry)
485 {
486 /*
487 * Synchronize the IO-APIC and the CPU by doing
488 * a dummy read from the IO-APIC
489 */
490 struct io_apic __iomem *io_apic;
491 io_apic = io_apic_base(entry->apic);
492 readl(&io_apic->data);
493 }
494
495 static void __mask_IO_APIC_irq(unsigned int irq)
496 {
497 io_apic_modify_irq(irq, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
498 }
499 #else /* CONFIG_X86_32 */
500 static void __mask_IO_APIC_irq(unsigned int irq)
501 {
502 io_apic_modify_irq(irq, ~0, IO_APIC_REDIR_MASKED, NULL);
503 }
504
505 static void __mask_and_edge_IO_APIC_irq(unsigned int irq)
506 {
507 io_apic_modify_irq(irq, ~IO_APIC_REDIR_LEVEL_TRIGGER,
508 IO_APIC_REDIR_MASKED, NULL);
509 }
510
511 static void __unmask_and_level_IO_APIC_irq(unsigned int irq)
512 {
513 io_apic_modify_irq(irq, ~IO_APIC_REDIR_MASKED,
514 IO_APIC_REDIR_LEVEL_TRIGGER, NULL);
515 }
516 #endif /* CONFIG_X86_32 */
517
518 static void mask_IO_APIC_irq (unsigned int irq)
519 {
520 unsigned long flags;
521
522 spin_lock_irqsave(&ioapic_lock, flags);
523 __mask_IO_APIC_irq(irq);
524 spin_unlock_irqrestore(&ioapic_lock, flags);
525 }
526
527 static void unmask_IO_APIC_irq (unsigned int irq)
528 {
529 unsigned long flags;
530
531 spin_lock_irqsave(&ioapic_lock, flags);
532 __unmask_IO_APIC_irq(irq);
533 spin_unlock_irqrestore(&ioapic_lock, flags);
534 }
535
536 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
537 {
538 struct IO_APIC_route_entry entry;
539
540 /* Check delivery_mode to be sure we're not clearing an SMI pin */
541 entry = ioapic_read_entry(apic, pin);
542 if (entry.delivery_mode == dest_SMI)
543 return;
544 /*
545 * Disable it in the IO-APIC irq-routing table:
546 */
547 ioapic_mask_entry(apic, pin);
548 }
549
550 static void clear_IO_APIC (void)
551 {
552 int apic, pin;
553
554 for (apic = 0; apic < nr_ioapics; apic++)
555 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
556 clear_IO_APIC_pin(apic, pin);
557 }
558
559 #if !defined(CONFIG_SMP) && defined(CONFIG_X86_32)
560 void send_IPI_self(int vector)
561 {
562 unsigned int cfg;
563
564 /*
565 * Wait for idle.
566 */
567 apic_wait_icr_idle();
568 cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL;
569 /*
570 * Send the IPI. The write to APIC_ICR fires this off.
571 */
572 apic_write(APIC_ICR, cfg);
573 }
574 #endif /* !CONFIG_SMP && CONFIG_X86_32*/
575
576 #ifdef CONFIG_X86_32
577 /*
578 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
579 * specific CPU-side IRQs.
580 */
581
582 #define MAX_PIRQS 8
583 static int pirq_entries [MAX_PIRQS];
584 static int pirqs_enabled;
585
586 static int __init ioapic_pirq_setup(char *str)
587 {
588 int i, max;
589 int ints[MAX_PIRQS+1];
590
591 get_options(str, ARRAY_SIZE(ints), ints);
592
593 for (i = 0; i < MAX_PIRQS; i++)
594 pirq_entries[i] = -1;
595
596 pirqs_enabled = 1;
597 apic_printk(APIC_VERBOSE, KERN_INFO
598 "PIRQ redirection, working around broken MP-BIOS.\n");
599 max = MAX_PIRQS;
600 if (ints[0] < MAX_PIRQS)
601 max = ints[0];
602
603 for (i = 0; i < max; i++) {
604 apic_printk(APIC_VERBOSE, KERN_DEBUG
605 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
606 /*
607 * PIRQs are mapped upside down, usually.
608 */
609 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
610 }
611 return 1;
612 }
613
614 __setup("pirq=", ioapic_pirq_setup);
615 #endif /* CONFIG_X86_32 */
616
617 #ifdef CONFIG_INTR_REMAP
618 /* I/O APIC RTE contents at the OS boot up */
619 static struct IO_APIC_route_entry *early_ioapic_entries[MAX_IO_APICS];
620
621 /*
622 * Saves and masks all the unmasked IO-APIC RTE's
623 */
624 int save_mask_IO_APIC_setup(void)
625 {
626 union IO_APIC_reg_01 reg_01;
627 unsigned long flags;
628 int apic, pin;
629
630 /*
631 * The number of IO-APIC IRQ registers (== #pins):
632 */
633 for (apic = 0; apic < nr_ioapics; apic++) {
634 spin_lock_irqsave(&ioapic_lock, flags);
635 reg_01.raw = io_apic_read(apic, 1);
636 spin_unlock_irqrestore(&ioapic_lock, flags);
637 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
638 }
639
640 for (apic = 0; apic < nr_ioapics; apic++) {
641 early_ioapic_entries[apic] =
642 kzalloc(sizeof(struct IO_APIC_route_entry) *
643 nr_ioapic_registers[apic], GFP_KERNEL);
644 if (!early_ioapic_entries[apic])
645 goto nomem;
646 }
647
648 for (apic = 0; apic < nr_ioapics; apic++)
649 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
650 struct IO_APIC_route_entry entry;
651
652 entry = early_ioapic_entries[apic][pin] =
653 ioapic_read_entry(apic, pin);
654 if (!entry.mask) {
655 entry.mask = 1;
656 ioapic_write_entry(apic, pin, entry);
657 }
658 }
659
660 return 0;
661
662 nomem:
663 while (apic >= 0)
664 kfree(early_ioapic_entries[apic--]);
665 memset(early_ioapic_entries, 0,
666 ARRAY_SIZE(early_ioapic_entries));
667
668 return -ENOMEM;
669 }
670
671 void restore_IO_APIC_setup(void)
672 {
673 int apic, pin;
674
675 for (apic = 0; apic < nr_ioapics; apic++) {
676 if (!early_ioapic_entries[apic])
677 break;
678 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
679 ioapic_write_entry(apic, pin,
680 early_ioapic_entries[apic][pin]);
681 kfree(early_ioapic_entries[apic]);
682 early_ioapic_entries[apic] = NULL;
683 }
684 }
685
686 void reinit_intr_remapped_IO_APIC(int intr_remapping)
687 {
688 /*
689 * for now plain restore of previous settings.
690 * TBD: In the case of OS enabling interrupt-remapping,
691 * IO-APIC RTE's need to be setup to point to interrupt-remapping
692 * table entries. for now, do a plain restore, and wait for
693 * the setup_IO_APIC_irqs() to do proper initialization.
694 */
695 restore_IO_APIC_setup();
696 }
697 #endif
698
699 /*
700 * Find the IRQ entry number of a certain pin.
701 */
702 static int find_irq_entry(int apic, int pin, int type)
703 {
704 int i;
705
706 for (i = 0; i < mp_irq_entries; i++)
707 if (mp_irqs[i].mp_irqtype == type &&
708 (mp_irqs[i].mp_dstapic == mp_ioapics[apic].mp_apicid ||
709 mp_irqs[i].mp_dstapic == MP_APIC_ALL) &&
710 mp_irqs[i].mp_dstirq == pin)
711 return i;
712
713 return -1;
714 }
715
716 /*
717 * Find the pin to which IRQ[irq] (ISA) is connected
718 */
719 static int __init find_isa_irq_pin(int irq, int type)
720 {
721 int i;
722
723 for (i = 0; i < mp_irq_entries; i++) {
724 int lbus = mp_irqs[i].mp_srcbus;
725
726 if (test_bit(lbus, mp_bus_not_pci) &&
727 (mp_irqs[i].mp_irqtype == type) &&
728 (mp_irqs[i].mp_srcbusirq == irq))
729
730 return mp_irqs[i].mp_dstirq;
731 }
732 return -1;
733 }
734
735 static int __init find_isa_irq_apic(int irq, int type)
736 {
737 int i;
738
739 for (i = 0; i < mp_irq_entries; i++) {
740 int lbus = mp_irqs[i].mp_srcbus;
741
742 if (test_bit(lbus, mp_bus_not_pci) &&
743 (mp_irqs[i].mp_irqtype == type) &&
744 (mp_irqs[i].mp_srcbusirq == irq))
745 break;
746 }
747 if (i < mp_irq_entries) {
748 int apic;
749 for(apic = 0; apic < nr_ioapics; apic++) {
750 if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic)
751 return apic;
752 }
753 }
754
755 return -1;
756 }
757
758 /*
759 * Find a specific PCI IRQ entry.
760 * Not an __init, possibly needed by modules
761 */
762 static int pin_2_irq(int idx, int apic, int pin);
763
764 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
765 {
766 int apic, i, best_guess = -1;
767
768 apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
769 bus, slot, pin);
770 if (test_bit(bus, mp_bus_not_pci)) {
771 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
772 return -1;
773 }
774 for (i = 0; i < mp_irq_entries; i++) {
775 int lbus = mp_irqs[i].mp_srcbus;
776
777 for (apic = 0; apic < nr_ioapics; apic++)
778 if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic ||
779 mp_irqs[i].mp_dstapic == MP_APIC_ALL)
780 break;
781
782 if (!test_bit(lbus, mp_bus_not_pci) &&
783 !mp_irqs[i].mp_irqtype &&
784 (bus == lbus) &&
785 (slot == ((mp_irqs[i].mp_srcbusirq >> 2) & 0x1f))) {
786 int irq = pin_2_irq(i,apic,mp_irqs[i].mp_dstirq);
787
788 if (!(apic || IO_APIC_IRQ(irq)))
789 continue;
790
791 if (pin == (mp_irqs[i].mp_srcbusirq & 3))
792 return irq;
793 /*
794 * Use the first all-but-pin matching entry as a
795 * best-guess fuzzy result for broken mptables.
796 */
797 if (best_guess < 0)
798 best_guess = irq;
799 }
800 }
801 return best_guess;
802 }
803
804 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
805
806 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
807 /*
808 * EISA Edge/Level control register, ELCR
809 */
810 static int EISA_ELCR(unsigned int irq)
811 {
812 if (irq < 16) {
813 unsigned int port = 0x4d0 + (irq >> 3);
814 return (inb(port) >> (irq & 7)) & 1;
815 }
816 apic_printk(APIC_VERBOSE, KERN_INFO
817 "Broken MPtable reports ISA irq %d\n", irq);
818 return 0;
819 }
820
821 #endif
822
823 /* ISA interrupts are always polarity zero edge triggered,
824 * when listed as conforming in the MP table. */
825
826 #define default_ISA_trigger(idx) (0)
827 #define default_ISA_polarity(idx) (0)
828
829 /* EISA interrupts are always polarity zero and can be edge or level
830 * trigger depending on the ELCR value. If an interrupt is listed as
831 * EISA conforming in the MP table, that means its trigger type must
832 * be read in from the ELCR */
833
834 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].mp_srcbusirq))
835 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
836
837 /* PCI interrupts are always polarity one level triggered,
838 * when listed as conforming in the MP table. */
839
840 #define default_PCI_trigger(idx) (1)
841 #define default_PCI_polarity(idx) (1)
842
843 /* MCA interrupts are always polarity zero level triggered,
844 * when listed as conforming in the MP table. */
845
846 #define default_MCA_trigger(idx) (1)
847 #define default_MCA_polarity(idx) default_ISA_polarity(idx)
848
849 static int MPBIOS_polarity(int idx)
850 {
851 int bus = mp_irqs[idx].mp_srcbus;
852 int polarity;
853
854 /*
855 * Determine IRQ line polarity (high active or low active):
856 */
857 switch (mp_irqs[idx].mp_irqflag & 3)
858 {
859 case 0: /* conforms, ie. bus-type dependent polarity */
860 if (test_bit(bus, mp_bus_not_pci))
861 polarity = default_ISA_polarity(idx);
862 else
863 polarity = default_PCI_polarity(idx);
864 break;
865 case 1: /* high active */
866 {
867 polarity = 0;
868 break;
869 }
870 case 2: /* reserved */
871 {
872 printk(KERN_WARNING "broken BIOS!!\n");
873 polarity = 1;
874 break;
875 }
876 case 3: /* low active */
877 {
878 polarity = 1;
879 break;
880 }
881 default: /* invalid */
882 {
883 printk(KERN_WARNING "broken BIOS!!\n");
884 polarity = 1;
885 break;
886 }
887 }
888 return polarity;
889 }
890
891 static int MPBIOS_trigger(int idx)
892 {
893 int bus = mp_irqs[idx].mp_srcbus;
894 int trigger;
895
896 /*
897 * Determine IRQ trigger mode (edge or level sensitive):
898 */
899 switch ((mp_irqs[idx].mp_irqflag>>2) & 3)
900 {
901 case 0: /* conforms, ie. bus-type dependent */
902 if (test_bit(bus, mp_bus_not_pci))
903 trigger = default_ISA_trigger(idx);
904 else
905 trigger = default_PCI_trigger(idx);
906 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
907 switch (mp_bus_id_to_type[bus]) {
908 case MP_BUS_ISA: /* ISA pin */
909 {
910 /* set before the switch */
911 break;
912 }
913 case MP_BUS_EISA: /* EISA pin */
914 {
915 trigger = default_EISA_trigger(idx);
916 break;
917 }
918 case MP_BUS_PCI: /* PCI pin */
919 {
920 /* set before the switch */
921 break;
922 }
923 case MP_BUS_MCA: /* MCA pin */
924 {
925 trigger = default_MCA_trigger(idx);
926 break;
927 }
928 default:
929 {
930 printk(KERN_WARNING "broken BIOS!!\n");
931 trigger = 1;
932 break;
933 }
934 }
935 #endif
936 break;
937 case 1: /* edge */
938 {
939 trigger = 0;
940 break;
941 }
942 case 2: /* reserved */
943 {
944 printk(KERN_WARNING "broken BIOS!!\n");
945 trigger = 1;
946 break;
947 }
948 case 3: /* level */
949 {
950 trigger = 1;
951 break;
952 }
953 default: /* invalid */
954 {
955 printk(KERN_WARNING "broken BIOS!!\n");
956 trigger = 0;
957 break;
958 }
959 }
960 return trigger;
961 }
962
963 static inline int irq_polarity(int idx)
964 {
965 return MPBIOS_polarity(idx);
966 }
967
968 static inline int irq_trigger(int idx)
969 {
970 return MPBIOS_trigger(idx);
971 }
972
973 int (*ioapic_renumber_irq)(int ioapic, int irq);
974 static int pin_2_irq(int idx, int apic, int pin)
975 {
976 int irq, i;
977 int bus = mp_irqs[idx].mp_srcbus;
978
979 /*
980 * Debugging check, we are in big trouble if this message pops up!
981 */
982 if (mp_irqs[idx].mp_dstirq != pin)
983 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
984
985 if (test_bit(bus, mp_bus_not_pci)) {
986 irq = mp_irqs[idx].mp_srcbusirq;
987 } else {
988 /*
989 * PCI IRQs are mapped in order
990 */
991 i = irq = 0;
992 while (i < apic)
993 irq += nr_ioapic_registers[i++];
994 irq += pin;
995 /*
996 * For MPS mode, so far only needed by ES7000 platform
997 */
998 if (ioapic_renumber_irq)
999 irq = ioapic_renumber_irq(apic, irq);
1000 }
1001
1002 #ifdef CONFIG_X86_32
1003 /*
1004 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1005 */
1006 if ((pin >= 16) && (pin <= 23)) {
1007 if (pirq_entries[pin-16] != -1) {
1008 if (!pirq_entries[pin-16]) {
1009 apic_printk(APIC_VERBOSE, KERN_DEBUG
1010 "disabling PIRQ%d\n", pin-16);
1011 } else {
1012 irq = pirq_entries[pin-16];
1013 apic_printk(APIC_VERBOSE, KERN_DEBUG
1014 "using PIRQ%d -> IRQ %d\n",
1015 pin-16, irq);
1016 }
1017 }
1018 }
1019 #endif
1020
1021 return irq;
1022 }
1023
1024 void lock_vector_lock(void)
1025 {
1026 /* Used to the online set of cpus does not change
1027 * during assign_irq_vector.
1028 */
1029 spin_lock(&vector_lock);
1030 }
1031
1032 void unlock_vector_lock(void)
1033 {
1034 spin_unlock(&vector_lock);
1035 }
1036
1037 static int __assign_irq_vector(int irq, cpumask_t mask)
1038 {
1039 /*
1040 * NOTE! The local APIC isn't very good at handling
1041 * multiple interrupts at the same interrupt level.
1042 * As the interrupt level is determined by taking the
1043 * vector number and shifting that right by 4, we
1044 * want to spread these out a bit so that they don't
1045 * all fall in the same interrupt level.
1046 *
1047 * Also, we've got to be careful not to trash gate
1048 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1049 */
1050 static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
1051 unsigned int old_vector;
1052 int cpu;
1053 struct irq_cfg *cfg;
1054
1055 cfg = irq_cfg(irq);
1056
1057 /* Only try and allocate irqs on cpus that are present */
1058 cpus_and(mask, mask, cpu_online_map);
1059
1060 if ((cfg->move_in_progress) || cfg->move_cleanup_count)
1061 return -EBUSY;
1062
1063 old_vector = cfg->vector;
1064 if (old_vector) {
1065 cpumask_t tmp;
1066 cpus_and(tmp, cfg->domain, mask);
1067 if (!cpus_empty(tmp))
1068 return 0;
1069 }
1070
1071 for_each_cpu_mask_nr(cpu, mask) {
1072 cpumask_t domain, new_mask;
1073 int new_cpu;
1074 int vector, offset;
1075
1076 domain = vector_allocation_domain(cpu);
1077 cpus_and(new_mask, domain, cpu_online_map);
1078
1079 vector = current_vector;
1080 offset = current_offset;
1081 next:
1082 vector += 8;
1083 if (vector >= first_system_vector) {
1084 /* If we run out of vectors on large boxen, must share them. */
1085 offset = (offset + 1) % 8;
1086 vector = FIRST_DEVICE_VECTOR + offset;
1087 }
1088 if (unlikely(current_vector == vector))
1089 continue;
1090 #ifdef CONFIG_X86_64
1091 if (vector == IA32_SYSCALL_VECTOR)
1092 goto next;
1093 #else
1094 if (vector == SYSCALL_VECTOR)
1095 goto next;
1096 #endif
1097 for_each_cpu_mask_nr(new_cpu, new_mask)
1098 if (per_cpu(vector_irq, new_cpu)[vector] != -1)
1099 goto next;
1100 /* Found one! */
1101 current_vector = vector;
1102 current_offset = offset;
1103 if (old_vector) {
1104 cfg->move_in_progress = 1;
1105 cfg->old_domain = cfg->domain;
1106 }
1107 for_each_cpu_mask_nr(new_cpu, new_mask)
1108 per_cpu(vector_irq, new_cpu)[vector] = irq;
1109 cfg->vector = vector;
1110 cfg->domain = domain;
1111 return 0;
1112 }
1113 return -ENOSPC;
1114 }
1115
1116 static int assign_irq_vector(int irq, cpumask_t mask)
1117 {
1118 int err;
1119 unsigned long flags;
1120
1121 spin_lock_irqsave(&vector_lock, flags);
1122 err = __assign_irq_vector(irq, mask);
1123 spin_unlock_irqrestore(&vector_lock, flags);
1124 return err;
1125 }
1126
1127 static void __clear_irq_vector(int irq)
1128 {
1129 struct irq_cfg *cfg;
1130 cpumask_t mask;
1131 int cpu, vector;
1132
1133 cfg = irq_cfg(irq);
1134 BUG_ON(!cfg->vector);
1135
1136 vector = cfg->vector;
1137 cpus_and(mask, cfg->domain, cpu_online_map);
1138 for_each_cpu_mask_nr(cpu, mask)
1139 per_cpu(vector_irq, cpu)[vector] = -1;
1140
1141 cfg->vector = 0;
1142 cpus_clear(cfg->domain);
1143
1144 if (likely(!cfg->move_in_progress))
1145 return;
1146 cpus_and(mask, cfg->old_domain, cpu_online_map);
1147 for_each_cpu_mask_nr(cpu, mask) {
1148 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS;
1149 vector++) {
1150 if (per_cpu(vector_irq, cpu)[vector] != irq)
1151 continue;
1152 per_cpu(vector_irq, cpu)[vector] = -1;
1153 break;
1154 }
1155 }
1156 cfg->move_in_progress = 0;
1157 }
1158
1159 void __setup_vector_irq(int cpu)
1160 {
1161 /* Initialize vector_irq on a new cpu */
1162 /* This function must be called with vector_lock held */
1163 int irq, vector;
1164 struct irq_cfg *cfg;
1165
1166 /* Mark the inuse vectors */
1167 for_each_irq_cfg(irq, cfg) {
1168 if (!cpu_isset(cpu, cfg->domain))
1169 continue;
1170 vector = cfg->vector;
1171 per_cpu(vector_irq, cpu)[vector] = irq;
1172 }
1173 /* Mark the free vectors */
1174 for (vector = 0; vector < NR_VECTORS; ++vector) {
1175 irq = per_cpu(vector_irq, cpu)[vector];
1176 if (irq < 0)
1177 continue;
1178
1179 cfg = irq_cfg(irq);
1180 if (!cpu_isset(cpu, cfg->domain))
1181 per_cpu(vector_irq, cpu)[vector] = -1;
1182 }
1183 }
1184
1185 static struct irq_chip ioapic_chip;
1186 #ifdef CONFIG_INTR_REMAP
1187 static struct irq_chip ir_ioapic_chip;
1188 #endif
1189
1190 #define IOAPIC_AUTO -1
1191 #define IOAPIC_EDGE 0
1192 #define IOAPIC_LEVEL 1
1193
1194 #ifdef CONFIG_X86_32
1195 static inline int IO_APIC_irq_trigger(int irq)
1196 {
1197 int apic, idx, pin;
1198
1199 for (apic = 0; apic < nr_ioapics; apic++) {
1200 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1201 idx = find_irq_entry(apic, pin, mp_INT);
1202 if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
1203 return irq_trigger(idx);
1204 }
1205 }
1206 /*
1207 * nonexistent IRQs are edge default
1208 */
1209 return 0;
1210 }
1211 #else
1212 static inline int IO_APIC_irq_trigger(int irq)
1213 {
1214 return 1;
1215 }
1216 #endif
1217
1218 static void ioapic_register_intr(int irq, unsigned long trigger)
1219 {
1220 struct irq_desc *desc;
1221
1222 desc = irq_to_desc(irq);
1223
1224 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1225 trigger == IOAPIC_LEVEL)
1226 desc->status |= IRQ_LEVEL;
1227 else
1228 desc->status &= ~IRQ_LEVEL;
1229
1230 #ifdef CONFIG_INTR_REMAP
1231 if (irq_remapped(irq)) {
1232 desc->status |= IRQ_MOVE_PCNTXT;
1233 if (trigger)
1234 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
1235 handle_fasteoi_irq,
1236 "fasteoi");
1237 else
1238 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
1239 handle_edge_irq, "edge");
1240 return;
1241 }
1242 #endif
1243 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1244 trigger == IOAPIC_LEVEL)
1245 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1246 handle_fasteoi_irq,
1247 "fasteoi");
1248 else
1249 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1250 handle_edge_irq, "edge");
1251 }
1252
1253 static int setup_ioapic_entry(int apic, int irq,
1254 struct IO_APIC_route_entry *entry,
1255 unsigned int destination, int trigger,
1256 int polarity, int vector)
1257 {
1258 /*
1259 * add it to the IO-APIC irq-routing table:
1260 */
1261 memset(entry,0,sizeof(*entry));
1262
1263 #ifdef CONFIG_INTR_REMAP
1264 if (intr_remapping_enabled) {
1265 struct intel_iommu *iommu = map_ioapic_to_ir(apic);
1266 struct irte irte;
1267 struct IR_IO_APIC_route_entry *ir_entry =
1268 (struct IR_IO_APIC_route_entry *) entry;
1269 int index;
1270
1271 if (!iommu)
1272 panic("No mapping iommu for ioapic %d\n", apic);
1273
1274 index = alloc_irte(iommu, irq, 1);
1275 if (index < 0)
1276 panic("Failed to allocate IRTE for ioapic %d\n", apic);
1277
1278 memset(&irte, 0, sizeof(irte));
1279
1280 irte.present = 1;
1281 irte.dst_mode = INT_DEST_MODE;
1282 irte.trigger_mode = trigger;
1283 irte.dlvry_mode = INT_DELIVERY_MODE;
1284 irte.vector = vector;
1285 irte.dest_id = IRTE_DEST(destination);
1286
1287 modify_irte(irq, &irte);
1288
1289 ir_entry->index2 = (index >> 15) & 0x1;
1290 ir_entry->zero = 0;
1291 ir_entry->format = 1;
1292 ir_entry->index = (index & 0x7fff);
1293 } else
1294 #endif
1295 {
1296 entry->delivery_mode = INT_DELIVERY_MODE;
1297 entry->dest_mode = INT_DEST_MODE;
1298 entry->dest = destination;
1299 }
1300
1301 entry->mask = 0; /* enable IRQ */
1302 entry->trigger = trigger;
1303 entry->polarity = polarity;
1304 entry->vector = vector;
1305
1306 /* Mask level triggered irqs.
1307 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
1308 */
1309 if (trigger)
1310 entry->mask = 1;
1311 return 0;
1312 }
1313
1314 static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
1315 int trigger, int polarity)
1316 {
1317 struct irq_cfg *cfg;
1318 struct IO_APIC_route_entry entry;
1319 cpumask_t mask;
1320
1321 if (!IO_APIC_IRQ(irq))
1322 return;
1323
1324 cfg = irq_cfg(irq);
1325
1326 mask = TARGET_CPUS;
1327 if (assign_irq_vector(irq, mask))
1328 return;
1329
1330 cpus_and(mask, cfg->domain, mask);
1331
1332 apic_printk(APIC_VERBOSE,KERN_DEBUG
1333 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
1334 "IRQ %d Mode:%i Active:%i)\n",
1335 apic, mp_ioapics[apic].mp_apicid, pin, cfg->vector,
1336 irq, trigger, polarity);
1337
1338
1339 if (setup_ioapic_entry(mp_ioapics[apic].mp_apicid, irq, &entry,
1340 cpu_mask_to_apicid(mask), trigger, polarity,
1341 cfg->vector)) {
1342 printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
1343 mp_ioapics[apic].mp_apicid, pin);
1344 __clear_irq_vector(irq);
1345 return;
1346 }
1347
1348 ioapic_register_intr(irq, trigger);
1349 if (irq < 16)
1350 disable_8259A_irq(irq);
1351
1352 ioapic_write_entry(apic, pin, entry);
1353 }
1354
1355 static void __init setup_IO_APIC_irqs(void)
1356 {
1357 int apic, pin, idx, irq;
1358 int notcon = 0;
1359
1360 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1361
1362 for (apic = 0; apic < nr_ioapics; apic++) {
1363 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1364
1365 idx = find_irq_entry(apic, pin, mp_INT);
1366 if (idx == -1) {
1367 if (!notcon) {
1368 notcon = 1;
1369 apic_printk(APIC_VERBOSE,
1370 KERN_DEBUG " %d-%d",
1371 mp_ioapics[apic].mp_apicid,
1372 pin);
1373 } else
1374 apic_printk(APIC_VERBOSE, " %d-%d",
1375 mp_ioapics[apic].mp_apicid,
1376 pin);
1377 continue;
1378 }
1379 if (notcon) {
1380 apic_printk(APIC_VERBOSE,
1381 " (apicid-pin) not connected\n");
1382 notcon = 0;
1383 }
1384
1385 irq = pin_2_irq(idx, apic, pin);
1386 #ifdef CONFIG_X86_32
1387 if (multi_timer_check(apic, irq))
1388 continue;
1389 #endif
1390 add_pin_to_irq(irq, apic, pin);
1391
1392 setup_IO_APIC_irq(apic, pin, irq,
1393 irq_trigger(idx), irq_polarity(idx));
1394 }
1395 }
1396
1397 if (notcon)
1398 apic_printk(APIC_VERBOSE,
1399 " (apicid-pin) not connected\n");
1400 }
1401
1402 /*
1403 * Set up the timer pin, possibly with the 8259A-master behind.
1404 */
1405 static void __init setup_timer_IRQ0_pin(unsigned int apic, unsigned int pin,
1406 int vector)
1407 {
1408 struct IO_APIC_route_entry entry;
1409
1410 #ifdef CONFIG_INTR_REMAP
1411 if (intr_remapping_enabled)
1412 return;
1413 #endif
1414
1415 memset(&entry, 0, sizeof(entry));
1416
1417 /*
1418 * We use logical delivery to get the timer IRQ
1419 * to the first CPU.
1420 */
1421 entry.dest_mode = INT_DEST_MODE;
1422 entry.mask = 1; /* mask IRQ now */
1423 entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
1424 entry.delivery_mode = INT_DELIVERY_MODE;
1425 entry.polarity = 0;
1426 entry.trigger = 0;
1427 entry.vector = vector;
1428
1429 /*
1430 * The timer IRQ doesn't have to know that behind the
1431 * scene we may have a 8259A-master in AEOI mode ...
1432 */
1433 set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
1434
1435 /*
1436 * Add it to the IO-APIC irq-routing table:
1437 */
1438 ioapic_write_entry(apic, pin, entry);
1439 }
1440
1441
1442 __apicdebuginit(void) print_IO_APIC(void)
1443 {
1444 int apic, i;
1445 union IO_APIC_reg_00 reg_00;
1446 union IO_APIC_reg_01 reg_01;
1447 union IO_APIC_reg_02 reg_02;
1448 union IO_APIC_reg_03 reg_03;
1449 unsigned long flags;
1450 struct irq_cfg *cfg;
1451 unsigned int irq;
1452
1453 if (apic_verbosity == APIC_QUIET)
1454 return;
1455
1456 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1457 for (i = 0; i < nr_ioapics; i++)
1458 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1459 mp_ioapics[i].mp_apicid, nr_ioapic_registers[i]);
1460
1461 /*
1462 * We are a bit conservative about what we expect. We have to
1463 * know about every hardware change ASAP.
1464 */
1465 printk(KERN_INFO "testing the IO APIC.......................\n");
1466
1467 for (apic = 0; apic < nr_ioapics; apic++) {
1468
1469 spin_lock_irqsave(&ioapic_lock, flags);
1470 reg_00.raw = io_apic_read(apic, 0);
1471 reg_01.raw = io_apic_read(apic, 1);
1472 if (reg_01.bits.version >= 0x10)
1473 reg_02.raw = io_apic_read(apic, 2);
1474 if (reg_01.bits.version >= 0x20)
1475 reg_03.raw = io_apic_read(apic, 3);
1476 spin_unlock_irqrestore(&ioapic_lock, flags);
1477
1478 printk("\n");
1479 printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mp_apicid);
1480 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1481 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1482 printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
1483 printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
1484
1485 printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
1486 printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
1487
1488 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1489 printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
1490
1491 /*
1492 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1493 * but the value of reg_02 is read as the previous read register
1494 * value, so ignore it if reg_02 == reg_01.
1495 */
1496 if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1497 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1498 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1499 }
1500
1501 /*
1502 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1503 * or reg_03, but the value of reg_0[23] is read as the previous read
1504 * register value, so ignore it if reg_03 == reg_0[12].
1505 */
1506 if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1507 reg_03.raw != reg_01.raw) {
1508 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1509 printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
1510 }
1511
1512 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1513
1514 printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
1515 " Stat Dmod Deli Vect: \n");
1516
1517 for (i = 0; i <= reg_01.bits.entries; i++) {
1518 struct IO_APIC_route_entry entry;
1519
1520 entry = ioapic_read_entry(apic, i);
1521
1522 printk(KERN_DEBUG " %02x %03X ",
1523 i,
1524 entry.dest
1525 );
1526
1527 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1528 entry.mask,
1529 entry.trigger,
1530 entry.irr,
1531 entry.polarity,
1532 entry.delivery_status,
1533 entry.dest_mode,
1534 entry.delivery_mode,
1535 entry.vector
1536 );
1537 }
1538 }
1539 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1540 for_each_irq_cfg(irq, cfg) {
1541 struct irq_pin_list *entry = cfg->irq_2_pin;
1542 if (!entry)
1543 continue;
1544 printk(KERN_DEBUG "IRQ%d ", irq);
1545 for (;;) {
1546 printk("-> %d:%d", entry->apic, entry->pin);
1547 if (!entry->next)
1548 break;
1549 entry = entry->next;
1550 }
1551 printk("\n");
1552 }
1553
1554 printk(KERN_INFO ".................................... done.\n");
1555
1556 return;
1557 }
1558
1559 __apicdebuginit(void) print_APIC_bitfield(int base)
1560 {
1561 unsigned int v;
1562 int i, j;
1563
1564 if (apic_verbosity == APIC_QUIET)
1565 return;
1566
1567 printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1568 for (i = 0; i < 8; i++) {
1569 v = apic_read(base + i*0x10);
1570 for (j = 0; j < 32; j++) {
1571 if (v & (1<<j))
1572 printk("1");
1573 else
1574 printk("0");
1575 }
1576 printk("\n");
1577 }
1578 }
1579
1580 __apicdebuginit(void) print_local_APIC(void *dummy)
1581 {
1582 unsigned int v, ver, maxlvt;
1583 u64 icr;
1584
1585 if (apic_verbosity == APIC_QUIET)
1586 return;
1587
1588 printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1589 smp_processor_id(), hard_smp_processor_id());
1590 v = apic_read(APIC_ID);
1591 printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, read_apic_id());
1592 v = apic_read(APIC_LVR);
1593 printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1594 ver = GET_APIC_VERSION(v);
1595 maxlvt = lapic_get_maxlvt();
1596
1597 v = apic_read(APIC_TASKPRI);
1598 printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1599
1600 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1601 if (!APIC_XAPIC(ver)) {
1602 v = apic_read(APIC_ARBPRI);
1603 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1604 v & APIC_ARBPRI_MASK);
1605 }
1606 v = apic_read(APIC_PROCPRI);
1607 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1608 }
1609
1610 /*
1611 * Remote read supported only in the 82489DX and local APIC for
1612 * Pentium processors.
1613 */
1614 if (!APIC_INTEGRATED(ver) || maxlvt == 3) {
1615 v = apic_read(APIC_RRR);
1616 printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1617 }
1618
1619 v = apic_read(APIC_LDR);
1620 printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1621 if (!x2apic_enabled()) {
1622 v = apic_read(APIC_DFR);
1623 printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1624 }
1625 v = apic_read(APIC_SPIV);
1626 printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1627
1628 printk(KERN_DEBUG "... APIC ISR field:\n");
1629 print_APIC_bitfield(APIC_ISR);
1630 printk(KERN_DEBUG "... APIC TMR field:\n");
1631 print_APIC_bitfield(APIC_TMR);
1632 printk(KERN_DEBUG "... APIC IRR field:\n");
1633 print_APIC_bitfield(APIC_IRR);
1634
1635 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1636 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
1637 apic_write(APIC_ESR, 0);
1638
1639 v = apic_read(APIC_ESR);
1640 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1641 }
1642
1643 icr = apic_icr_read();
1644 printk(KERN_DEBUG "... APIC ICR: %08x\n", (u32)icr);
1645 printk(KERN_DEBUG "... APIC ICR2: %08x\n", (u32)(icr >> 32));
1646
1647 v = apic_read(APIC_LVTT);
1648 printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1649
1650 if (maxlvt > 3) { /* PC is LVT#4. */
1651 v = apic_read(APIC_LVTPC);
1652 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1653 }
1654 v = apic_read(APIC_LVT0);
1655 printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1656 v = apic_read(APIC_LVT1);
1657 printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1658
1659 if (maxlvt > 2) { /* ERR is LVT#3. */
1660 v = apic_read(APIC_LVTERR);
1661 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1662 }
1663
1664 v = apic_read(APIC_TMICT);
1665 printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1666 v = apic_read(APIC_TMCCT);
1667 printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1668 v = apic_read(APIC_TDCR);
1669 printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1670 printk("\n");
1671 }
1672
1673 __apicdebuginit(void) print_all_local_APICs(void)
1674 {
1675 int cpu;
1676
1677 preempt_disable();
1678 for_each_online_cpu(cpu)
1679 smp_call_function_single(cpu, print_local_APIC, NULL, 1);
1680 preempt_enable();
1681 }
1682
1683 __apicdebuginit(void) print_PIC(void)
1684 {
1685 unsigned int v;
1686 unsigned long flags;
1687
1688 if (apic_verbosity == APIC_QUIET)
1689 return;
1690
1691 printk(KERN_DEBUG "\nprinting PIC contents\n");
1692
1693 spin_lock_irqsave(&i8259A_lock, flags);
1694
1695 v = inb(0xa1) << 8 | inb(0x21);
1696 printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
1697
1698 v = inb(0xa0) << 8 | inb(0x20);
1699 printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
1700
1701 outb(0x0b,0xa0);
1702 outb(0x0b,0x20);
1703 v = inb(0xa0) << 8 | inb(0x20);
1704 outb(0x0a,0xa0);
1705 outb(0x0a,0x20);
1706
1707 spin_unlock_irqrestore(&i8259A_lock, flags);
1708
1709 printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
1710
1711 v = inb(0x4d1) << 8 | inb(0x4d0);
1712 printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1713 }
1714
1715 __apicdebuginit(int) print_all_ICs(void)
1716 {
1717 print_PIC();
1718 print_all_local_APICs();
1719 print_IO_APIC();
1720
1721 return 0;
1722 }
1723
1724 fs_initcall(print_all_ICs);
1725
1726
1727 /* Where if anywhere is the i8259 connect in external int mode */
1728 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
1729
1730 void __init enable_IO_APIC(void)
1731 {
1732 union IO_APIC_reg_01 reg_01;
1733 int i8259_apic, i8259_pin;
1734 int apic;
1735 unsigned long flags;
1736
1737 #ifdef CONFIG_X86_32
1738 int i;
1739 if (!pirqs_enabled)
1740 for (i = 0; i < MAX_PIRQS; i++)
1741 pirq_entries[i] = -1;
1742 #endif
1743
1744 /*
1745 * The number of IO-APIC IRQ registers (== #pins):
1746 */
1747 for (apic = 0; apic < nr_ioapics; apic++) {
1748 spin_lock_irqsave(&ioapic_lock, flags);
1749 reg_01.raw = io_apic_read(apic, 1);
1750 spin_unlock_irqrestore(&ioapic_lock, flags);
1751 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1752 }
1753 for(apic = 0; apic < nr_ioapics; apic++) {
1754 int pin;
1755 /* See if any of the pins is in ExtINT mode */
1756 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1757 struct IO_APIC_route_entry entry;
1758 entry = ioapic_read_entry(apic, pin);
1759
1760 /* If the interrupt line is enabled and in ExtInt mode
1761 * I have found the pin where the i8259 is connected.
1762 */
1763 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1764 ioapic_i8259.apic = apic;
1765 ioapic_i8259.pin = pin;
1766 goto found_i8259;
1767 }
1768 }
1769 }
1770 found_i8259:
1771 /* Look to see what if the MP table has reported the ExtINT */
1772 /* If we could not find the appropriate pin by looking at the ioapic
1773 * the i8259 probably is not connected the ioapic but give the
1774 * mptable a chance anyway.
1775 */
1776 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1777 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1778 /* Trust the MP table if nothing is setup in the hardware */
1779 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1780 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1781 ioapic_i8259.pin = i8259_pin;
1782 ioapic_i8259.apic = i8259_apic;
1783 }
1784 /* Complain if the MP table and the hardware disagree */
1785 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1786 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1787 {
1788 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1789 }
1790
1791 /*
1792 * Do not trust the IO-APIC being empty at bootup
1793 */
1794 clear_IO_APIC();
1795 }
1796
1797 /*
1798 * Not an __init, needed by the reboot code
1799 */
1800 void disable_IO_APIC(void)
1801 {
1802 /*
1803 * Clear the IO-APIC before rebooting:
1804 */
1805 clear_IO_APIC();
1806
1807 /*
1808 * If the i8259 is routed through an IOAPIC
1809 * Put that IOAPIC in virtual wire mode
1810 * so legacy interrupts can be delivered.
1811 */
1812 if (ioapic_i8259.pin != -1) {
1813 struct IO_APIC_route_entry entry;
1814
1815 memset(&entry, 0, sizeof(entry));
1816 entry.mask = 0; /* Enabled */
1817 entry.trigger = 0; /* Edge */
1818 entry.irr = 0;
1819 entry.polarity = 0; /* High */
1820 entry.delivery_status = 0;
1821 entry.dest_mode = 0; /* Physical */
1822 entry.delivery_mode = dest_ExtINT; /* ExtInt */
1823 entry.vector = 0;
1824 entry.dest = read_apic_id();
1825
1826 /*
1827 * Add it to the IO-APIC irq-routing table:
1828 */
1829 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1830 }
1831
1832 disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1833 }
1834
1835 #ifdef CONFIG_X86_32
1836 /*
1837 * function to set the IO-APIC physical IDs based on the
1838 * values stored in the MPC table.
1839 *
1840 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
1841 */
1842
1843 static void __init setup_ioapic_ids_from_mpc(void)
1844 {
1845 union IO_APIC_reg_00 reg_00;
1846 physid_mask_t phys_id_present_map;
1847 int apic;
1848 int i;
1849 unsigned char old_id;
1850 unsigned long flags;
1851
1852 if (x86_quirks->setup_ioapic_ids && x86_quirks->setup_ioapic_ids())
1853 return;
1854
1855 /*
1856 * Don't check I/O APIC IDs for xAPIC systems. They have
1857 * no meaning without the serial APIC bus.
1858 */
1859 if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
1860 || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
1861 return;
1862 /*
1863 * This is broken; anything with a real cpu count has to
1864 * circumvent this idiocy regardless.
1865 */
1866 phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map);
1867
1868 /*
1869 * Set the IOAPIC ID to the value stored in the MPC table.
1870 */
1871 for (apic = 0; apic < nr_ioapics; apic++) {
1872
1873 /* Read the register 0 value */
1874 spin_lock_irqsave(&ioapic_lock, flags);
1875 reg_00.raw = io_apic_read(apic, 0);
1876 spin_unlock_irqrestore(&ioapic_lock, flags);
1877
1878 old_id = mp_ioapics[apic].mp_apicid;
1879
1880 if (mp_ioapics[apic].mp_apicid >= get_physical_broadcast()) {
1881 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
1882 apic, mp_ioapics[apic].mp_apicid);
1883 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1884 reg_00.bits.ID);
1885 mp_ioapics[apic].mp_apicid = reg_00.bits.ID;
1886 }
1887
1888 /*
1889 * Sanity check, is the ID really free? Every APIC in a
1890 * system must have a unique ID or we get lots of nice
1891 * 'stuck on smp_invalidate_needed IPI wait' messages.
1892 */
1893 if (check_apicid_used(phys_id_present_map,
1894 mp_ioapics[apic].mp_apicid)) {
1895 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
1896 apic, mp_ioapics[apic].mp_apicid);
1897 for (i = 0; i < get_physical_broadcast(); i++)
1898 if (!physid_isset(i, phys_id_present_map))
1899 break;
1900 if (i >= get_physical_broadcast())
1901 panic("Max APIC ID exceeded!\n");
1902 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1903 i);
1904 physid_set(i, phys_id_present_map);
1905 mp_ioapics[apic].mp_apicid = i;
1906 } else {
1907 physid_mask_t tmp;
1908 tmp = apicid_to_cpu_present(mp_ioapics[apic].mp_apicid);
1909 apic_printk(APIC_VERBOSE, "Setting %d in the "
1910 "phys_id_present_map\n",
1911 mp_ioapics[apic].mp_apicid);
1912 physids_or(phys_id_present_map, phys_id_present_map, tmp);
1913 }
1914
1915
1916 /*
1917 * We need to adjust the IRQ routing table
1918 * if the ID changed.
1919 */
1920 if (old_id != mp_ioapics[apic].mp_apicid)
1921 for (i = 0; i < mp_irq_entries; i++)
1922 if (mp_irqs[i].mp_dstapic == old_id)
1923 mp_irqs[i].mp_dstapic
1924 = mp_ioapics[apic].mp_apicid;
1925
1926 /*
1927 * Read the right value from the MPC table and
1928 * write it into the ID register.
1929 */
1930 apic_printk(APIC_VERBOSE, KERN_INFO
1931 "...changing IO-APIC physical APIC ID to %d ...",
1932 mp_ioapics[apic].mp_apicid);
1933
1934 reg_00.bits.ID = mp_ioapics[apic].mp_apicid;
1935 spin_lock_irqsave(&ioapic_lock, flags);
1936 io_apic_write(apic, 0, reg_00.raw);
1937 spin_unlock_irqrestore(&ioapic_lock, flags);
1938
1939 /*
1940 * Sanity check
1941 */
1942 spin_lock_irqsave(&ioapic_lock, flags);
1943 reg_00.raw = io_apic_read(apic, 0);
1944 spin_unlock_irqrestore(&ioapic_lock, flags);
1945 if (reg_00.bits.ID != mp_ioapics[apic].mp_apicid)
1946 printk("could not set ID!\n");
1947 else
1948 apic_printk(APIC_VERBOSE, " ok.\n");
1949 }
1950 }
1951 #endif
1952
1953 int no_timer_check __initdata;
1954
1955 static int __init notimercheck(char *s)
1956 {
1957 no_timer_check = 1;
1958 return 1;
1959 }
1960 __setup("no_timer_check", notimercheck);
1961
1962 /*
1963 * There is a nasty bug in some older SMP boards, their mptable lies
1964 * about the timer IRQ. We do the following to work around the situation:
1965 *
1966 * - timer IRQ defaults to IO-APIC IRQ
1967 * - if this function detects that timer IRQs are defunct, then we fall
1968 * back to ISA timer IRQs
1969 */
1970 static int __init timer_irq_works(void)
1971 {
1972 unsigned long t1 = jiffies;
1973 unsigned long flags;
1974
1975 if (no_timer_check)
1976 return 1;
1977
1978 local_save_flags(flags);
1979 local_irq_enable();
1980 /* Let ten ticks pass... */
1981 mdelay((10 * 1000) / HZ);
1982 local_irq_restore(flags);
1983
1984 /*
1985 * Expect a few ticks at least, to be sure some possible
1986 * glue logic does not lock up after one or two first
1987 * ticks in a non-ExtINT mode. Also the local APIC
1988 * might have cached one ExtINT interrupt. Finally, at
1989 * least one tick may be lost due to delays.
1990 */
1991
1992 /* jiffies wrap? */
1993 if (time_after(jiffies, t1 + 4))
1994 return 1;
1995 return 0;
1996 }
1997
1998 /*
1999 * In the SMP+IOAPIC case it might happen that there are an unspecified
2000 * number of pending IRQ events unhandled. These cases are very rare,
2001 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
2002 * better to do it this way as thus we do not have to be aware of
2003 * 'pending' interrupts in the IRQ path, except at this point.
2004 */
2005 /*
2006 * Edge triggered needs to resend any interrupt
2007 * that was delayed but this is now handled in the device
2008 * independent code.
2009 */
2010
2011 /*
2012 * Starting up a edge-triggered IO-APIC interrupt is
2013 * nasty - we need to make sure that we get the edge.
2014 * If it is already asserted for some reason, we need
2015 * return 1 to indicate that is was pending.
2016 *
2017 * This is not complete - we should be able to fake
2018 * an edge even if it isn't on the 8259A...
2019 */
2020
2021 static unsigned int startup_ioapic_irq(unsigned int irq)
2022 {
2023 int was_pending = 0;
2024 unsigned long flags;
2025
2026 spin_lock_irqsave(&ioapic_lock, flags);
2027 if (irq < 16) {
2028 disable_8259A_irq(irq);
2029 if (i8259A_irq_pending(irq))
2030 was_pending = 1;
2031 }
2032 __unmask_IO_APIC_irq(irq);
2033 spin_unlock_irqrestore(&ioapic_lock, flags);
2034
2035 return was_pending;
2036 }
2037
2038 #ifdef CONFIG_X86_64
2039 static int ioapic_retrigger_irq(unsigned int irq)
2040 {
2041
2042 struct irq_cfg *cfg = irq_cfg(irq);
2043 unsigned long flags;
2044
2045 spin_lock_irqsave(&vector_lock, flags);
2046 send_IPI_mask(cpumask_of_cpu(first_cpu(cfg->domain)), cfg->vector);
2047 spin_unlock_irqrestore(&vector_lock, flags);
2048
2049 return 1;
2050 }
2051 #else
2052 static int ioapic_retrigger_irq(unsigned int irq)
2053 {
2054 send_IPI_self(irq_cfg(irq)->vector);
2055
2056 return 1;
2057 }
2058 #endif
2059
2060 /*
2061 * Level and edge triggered IO-APIC interrupts need different handling,
2062 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
2063 * handled with the level-triggered descriptor, but that one has slightly
2064 * more overhead. Level-triggered interrupts cannot be handled with the
2065 * edge-triggered handler, without risking IRQ storms and other ugly
2066 * races.
2067 */
2068
2069 #ifdef CONFIG_SMP
2070
2071 #ifdef CONFIG_INTR_REMAP
2072 static void ir_irq_migration(struct work_struct *work);
2073
2074 static DECLARE_DELAYED_WORK(ir_migration_work, ir_irq_migration);
2075
2076 /*
2077 * Migrate the IO-APIC irq in the presence of intr-remapping.
2078 *
2079 * For edge triggered, irq migration is a simple atomic update(of vector
2080 * and cpu destination) of IRTE and flush the hardware cache.
2081 *
2082 * For level triggered, we need to modify the io-apic RTE aswell with the update
2083 * vector information, along with modifying IRTE with vector and destination.
2084 * So irq migration for level triggered is little bit more complex compared to
2085 * edge triggered migration. But the good news is, we use the same algorithm
2086 * for level triggered migration as we have today, only difference being,
2087 * we now initiate the irq migration from process context instead of the
2088 * interrupt context.
2089 *
2090 * In future, when we do a directed EOI (combined with cpu EOI broadcast
2091 * suppression) to the IO-APIC, level triggered irq migration will also be
2092 * as simple as edge triggered migration and we can do the irq migration
2093 * with a simple atomic update to IO-APIC RTE.
2094 */
2095 static void migrate_ioapic_irq(int irq, cpumask_t mask)
2096 {
2097 struct irq_cfg *cfg;
2098 struct irq_desc *desc;
2099 cpumask_t tmp, cleanup_mask;
2100 struct irte irte;
2101 int modify_ioapic_rte;
2102 unsigned int dest;
2103 unsigned long flags;
2104
2105 cpus_and(tmp, mask, cpu_online_map);
2106 if (cpus_empty(tmp))
2107 return;
2108
2109 if (get_irte(irq, &irte))
2110 return;
2111
2112 if (assign_irq_vector(irq, mask))
2113 return;
2114
2115 cfg = irq_cfg(irq);
2116 cpus_and(tmp, cfg->domain, mask);
2117 dest = cpu_mask_to_apicid(tmp);
2118
2119 desc = irq_to_desc(irq);
2120 modify_ioapic_rte = desc->status & IRQ_LEVEL;
2121 if (modify_ioapic_rte) {
2122 spin_lock_irqsave(&ioapic_lock, flags);
2123 __target_IO_APIC_irq(irq, dest, cfg->vector);
2124 spin_unlock_irqrestore(&ioapic_lock, flags);
2125 }
2126
2127 irte.vector = cfg->vector;
2128 irte.dest_id = IRTE_DEST(dest);
2129
2130 /*
2131 * Modified the IRTE and flushes the Interrupt entry cache.
2132 */
2133 modify_irte(irq, &irte);
2134
2135 if (cfg->move_in_progress) {
2136 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
2137 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
2138 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
2139 cfg->move_in_progress = 0;
2140 }
2141
2142 desc->affinity = mask;
2143 }
2144
2145 static int migrate_irq_remapped_level(int irq)
2146 {
2147 int ret = -1;
2148 struct irq_desc *desc = irq_to_desc(irq);
2149
2150 mask_IO_APIC_irq(irq);
2151
2152 if (io_apic_level_ack_pending(irq)) {
2153 /*
2154 * Interrupt in progress. Migrating irq now will change the
2155 * vector information in the IO-APIC RTE and that will confuse
2156 * the EOI broadcast performed by cpu.
2157 * So, delay the irq migration to the next instance.
2158 */
2159 schedule_delayed_work(&ir_migration_work, 1);
2160 goto unmask;
2161 }
2162
2163 /* everthing is clear. we have right of way */
2164 migrate_ioapic_irq(irq, desc->pending_mask);
2165
2166 ret = 0;
2167 desc->status &= ~IRQ_MOVE_PENDING;
2168 cpus_clear(desc->pending_mask);
2169
2170 unmask:
2171 unmask_IO_APIC_irq(irq);
2172 return ret;
2173 }
2174
2175 static void ir_irq_migration(struct work_struct *work)
2176 {
2177 unsigned int irq;
2178 struct irq_desc *desc;
2179
2180 for_each_irq_desc(irq, desc) {
2181 if (desc->status & IRQ_MOVE_PENDING) {
2182 unsigned long flags;
2183
2184 spin_lock_irqsave(&desc->lock, flags);
2185 if (!desc->chip->set_affinity ||
2186 !(desc->status & IRQ_MOVE_PENDING)) {
2187 desc->status &= ~IRQ_MOVE_PENDING;
2188 spin_unlock_irqrestore(&desc->lock, flags);
2189 continue;
2190 }
2191
2192 desc->chip->set_affinity(irq, desc->pending_mask);
2193 spin_unlock_irqrestore(&desc->lock, flags);
2194 }
2195 }
2196 }
2197
2198 /*
2199 * Migrates the IRQ destination in the process context.
2200 */
2201 static void set_ir_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
2202 {
2203 struct irq_desc *desc = irq_to_desc(irq);
2204
2205 if (desc->status & IRQ_LEVEL) {
2206 desc->status |= IRQ_MOVE_PENDING;
2207 desc->pending_mask = mask;
2208 migrate_irq_remapped_level(irq);
2209 return;
2210 }
2211
2212 migrate_ioapic_irq(irq, mask);
2213 }
2214 #endif
2215
2216 asmlinkage void smp_irq_move_cleanup_interrupt(void)
2217 {
2218 unsigned vector, me;
2219 ack_APIC_irq();
2220 #ifdef CONFIG_X86_64
2221 exit_idle();
2222 #endif
2223 irq_enter();
2224
2225 me = smp_processor_id();
2226 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
2227 unsigned int irq;
2228 struct irq_desc *desc;
2229 struct irq_cfg *cfg;
2230 irq = __get_cpu_var(vector_irq)[vector];
2231
2232 desc = irq_to_desc(irq);
2233 if (!desc)
2234 continue;
2235
2236 cfg = irq_cfg(irq);
2237 spin_lock(&desc->lock);
2238 if (!cfg->move_cleanup_count)
2239 goto unlock;
2240
2241 if ((vector == cfg->vector) && cpu_isset(me, cfg->domain))
2242 goto unlock;
2243
2244 __get_cpu_var(vector_irq)[vector] = -1;
2245 cfg->move_cleanup_count--;
2246 unlock:
2247 spin_unlock(&desc->lock);
2248 }
2249
2250 irq_exit();
2251 }
2252
2253 static void irq_complete_move(unsigned int irq)
2254 {
2255 struct irq_cfg *cfg = irq_cfg(irq);
2256 unsigned vector, me;
2257
2258 if (likely(!cfg->move_in_progress))
2259 return;
2260
2261 vector = ~get_irq_regs()->orig_ax;
2262 me = smp_processor_id();
2263 if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) {
2264 cpumask_t cleanup_mask;
2265
2266 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
2267 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
2268 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
2269 cfg->move_in_progress = 0;
2270 }
2271 }
2272 #else
2273 static inline void irq_complete_move(unsigned int irq) {}
2274 #endif
2275 #ifdef CONFIG_INTR_REMAP
2276 static void ack_x2apic_level(unsigned int irq)
2277 {
2278 ack_x2APIC_irq();
2279 }
2280
2281 static void ack_x2apic_edge(unsigned int irq)
2282 {
2283 ack_x2APIC_irq();
2284 }
2285 #endif
2286
2287 static void ack_apic_edge(unsigned int irq)
2288 {
2289 irq_complete_move(irq);
2290 move_native_irq(irq);
2291 ack_APIC_irq();
2292 }
2293
2294 atomic_t irq_mis_count;
2295
2296 static void ack_apic_level(unsigned int irq)
2297 {
2298 #ifdef CONFIG_X86_32
2299 unsigned long v;
2300 int i;
2301 #endif
2302 int do_unmask_irq = 0;
2303
2304 irq_complete_move(irq);
2305 #ifdef CONFIG_GENERIC_PENDING_IRQ
2306 /* If we are moving the irq we need to mask it */
2307 if (unlikely(irq_to_desc(irq)->status & IRQ_MOVE_PENDING)) {
2308 do_unmask_irq = 1;
2309 mask_IO_APIC_irq(irq);
2310 }
2311 #endif
2312
2313 #ifdef CONFIG_X86_32
2314 /*
2315 * It appears there is an erratum which affects at least version 0x11
2316 * of I/O APIC (that's the 82093AA and cores integrated into various
2317 * chipsets). Under certain conditions a level-triggered interrupt is
2318 * erroneously delivered as edge-triggered one but the respective IRR
2319 * bit gets set nevertheless. As a result the I/O unit expects an EOI
2320 * message but it will never arrive and further interrupts are blocked
2321 * from the source. The exact reason is so far unknown, but the
2322 * phenomenon was observed when two consecutive interrupt requests
2323 * from a given source get delivered to the same CPU and the source is
2324 * temporarily disabled in between.
2325 *
2326 * A workaround is to simulate an EOI message manually. We achieve it
2327 * by setting the trigger mode to edge and then to level when the edge
2328 * trigger mode gets detected in the TMR of a local APIC for a
2329 * level-triggered interrupt. We mask the source for the time of the
2330 * operation to prevent an edge-triggered interrupt escaping meanwhile.
2331 * The idea is from Manfred Spraul. --macro
2332 */
2333 i = irq_cfg(irq)->vector;
2334
2335 v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
2336 #endif
2337
2338 /*
2339 * We must acknowledge the irq before we move it or the acknowledge will
2340 * not propagate properly.
2341 */
2342 ack_APIC_irq();
2343
2344 /* Now we can move and renable the irq */
2345 if (unlikely(do_unmask_irq)) {
2346 /* Only migrate the irq if the ack has been received.
2347 *
2348 * On rare occasions the broadcast level triggered ack gets
2349 * delayed going to ioapics, and if we reprogram the
2350 * vector while Remote IRR is still set the irq will never
2351 * fire again.
2352 *
2353 * To prevent this scenario we read the Remote IRR bit
2354 * of the ioapic. This has two effects.
2355 * - On any sane system the read of the ioapic will
2356 * flush writes (and acks) going to the ioapic from
2357 * this cpu.
2358 * - We get to see if the ACK has actually been delivered.
2359 *
2360 * Based on failed experiments of reprogramming the
2361 * ioapic entry from outside of irq context starting
2362 * with masking the ioapic entry and then polling until
2363 * Remote IRR was clear before reprogramming the
2364 * ioapic I don't trust the Remote IRR bit to be
2365 * completey accurate.
2366 *
2367 * However there appears to be no other way to plug
2368 * this race, so if the Remote IRR bit is not
2369 * accurate and is causing problems then it is a hardware bug
2370 * and you can go talk to the chipset vendor about it.
2371 */
2372 if (!io_apic_level_ack_pending(irq))
2373 move_masked_irq(irq);
2374 unmask_IO_APIC_irq(irq);
2375 }
2376
2377 #ifdef CONFIG_X86_32
2378 if (!(v & (1 << (i & 0x1f)))) {
2379 atomic_inc(&irq_mis_count);
2380 spin_lock(&ioapic_lock);
2381 __mask_and_edge_IO_APIC_irq(irq);
2382 __unmask_and_level_IO_APIC_irq(irq);
2383 spin_unlock(&ioapic_lock);
2384 }
2385 #endif
2386 }
2387
2388 static struct irq_chip ioapic_chip __read_mostly = {
2389 .name = "IO-APIC",
2390 .startup = startup_ioapic_irq,
2391 .mask = mask_IO_APIC_irq,
2392 .unmask = unmask_IO_APIC_irq,
2393 .ack = ack_apic_edge,
2394 .eoi = ack_apic_level,
2395 #ifdef CONFIG_SMP
2396 .set_affinity = set_ioapic_affinity_irq,
2397 #endif
2398 .retrigger = ioapic_retrigger_irq,
2399 };
2400
2401 #ifdef CONFIG_INTR_REMAP
2402 static struct irq_chip ir_ioapic_chip __read_mostly = {
2403 .name = "IR-IO-APIC",
2404 .startup = startup_ioapic_irq,
2405 .mask = mask_IO_APIC_irq,
2406 .unmask = unmask_IO_APIC_irq,
2407 .ack = ack_x2apic_edge,
2408 .eoi = ack_x2apic_level,
2409 #ifdef CONFIG_SMP
2410 .set_affinity = set_ir_ioapic_affinity_irq,
2411 #endif
2412 .retrigger = ioapic_retrigger_irq,
2413 };
2414 #endif
2415
2416 static inline void init_IO_APIC_traps(void)
2417 {
2418 int irq;
2419 struct irq_desc *desc;
2420 struct irq_cfg *cfg;
2421
2422 /*
2423 * NOTE! The local APIC isn't very good at handling
2424 * multiple interrupts at the same interrupt level.
2425 * As the interrupt level is determined by taking the
2426 * vector number and shifting that right by 4, we
2427 * want to spread these out a bit so that they don't
2428 * all fall in the same interrupt level.
2429 *
2430 * Also, we've got to be careful not to trash gate
2431 * 0x80, because int 0x80 is hm, kind of importantish. ;)
2432 */
2433 for_each_irq_cfg(irq, cfg) {
2434 if (IO_APIC_IRQ(irq) && !cfg->vector) {
2435 /*
2436 * Hmm.. We don't have an entry for this,
2437 * so default to an old-fashioned 8259
2438 * interrupt if we can..
2439 */
2440 if (irq < 16)
2441 make_8259A_irq(irq);
2442 else {
2443 desc = irq_to_desc(irq);
2444 /* Strange. Oh, well.. */
2445 desc->chip = &no_irq_chip;
2446 }
2447 }
2448 }
2449 }
2450
2451 /*
2452 * The local APIC irq-chip implementation:
2453 */
2454
2455 static void mask_lapic_irq(unsigned int irq)
2456 {
2457 unsigned long v;
2458
2459 v = apic_read(APIC_LVT0);
2460 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
2461 }
2462
2463 static void unmask_lapic_irq(unsigned int irq)
2464 {
2465 unsigned long v;
2466
2467 v = apic_read(APIC_LVT0);
2468 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
2469 }
2470
2471 static void ack_lapic_irq (unsigned int irq)
2472 {
2473 ack_APIC_irq();
2474 }
2475
2476 static struct irq_chip lapic_chip __read_mostly = {
2477 .name = "local-APIC",
2478 .mask = mask_lapic_irq,
2479 .unmask = unmask_lapic_irq,
2480 .ack = ack_lapic_irq,
2481 };
2482
2483 static void lapic_register_intr(int irq)
2484 {
2485 struct irq_desc *desc;
2486
2487 desc = irq_to_desc(irq);
2488 desc->status &= ~IRQ_LEVEL;
2489 set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
2490 "edge");
2491 }
2492
2493 static void __init setup_nmi(void)
2494 {
2495 /*
2496 * Dirty trick to enable the NMI watchdog ...
2497 * We put the 8259A master into AEOI mode and
2498 * unmask on all local APICs LVT0 as NMI.
2499 *
2500 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2501 * is from Maciej W. Rozycki - so we do not have to EOI from
2502 * the NMI handler or the timer interrupt.
2503 */
2504 apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
2505
2506 enable_NMI_through_LVT0();
2507
2508 apic_printk(APIC_VERBOSE, " done.\n");
2509 }
2510
2511 /*
2512 * This looks a bit hackish but it's about the only one way of sending
2513 * a few INTA cycles to 8259As and any associated glue logic. ICR does
2514 * not support the ExtINT mode, unfortunately. We need to send these
2515 * cycles as some i82489DX-based boards have glue logic that keeps the
2516 * 8259A interrupt line asserted until INTA. --macro
2517 */
2518 static inline void __init unlock_ExtINT_logic(void)
2519 {
2520 int apic, pin, i;
2521 struct IO_APIC_route_entry entry0, entry1;
2522 unsigned char save_control, save_freq_select;
2523
2524 pin = find_isa_irq_pin(8, mp_INT);
2525 if (pin == -1) {
2526 WARN_ON_ONCE(1);
2527 return;
2528 }
2529 apic = find_isa_irq_apic(8, mp_INT);
2530 if (apic == -1) {
2531 WARN_ON_ONCE(1);
2532 return;
2533 }
2534
2535 entry0 = ioapic_read_entry(apic, pin);
2536 clear_IO_APIC_pin(apic, pin);
2537
2538 memset(&entry1, 0, sizeof(entry1));
2539
2540 entry1.dest_mode = 0; /* physical delivery */
2541 entry1.mask = 0; /* unmask IRQ now */
2542 entry1.dest = hard_smp_processor_id();
2543 entry1.delivery_mode = dest_ExtINT;
2544 entry1.polarity = entry0.polarity;
2545 entry1.trigger = 0;
2546 entry1.vector = 0;
2547
2548 ioapic_write_entry(apic, pin, entry1);
2549
2550 save_control = CMOS_READ(RTC_CONTROL);
2551 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2552 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2553 RTC_FREQ_SELECT);
2554 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2555
2556 i = 100;
2557 while (i-- > 0) {
2558 mdelay(10);
2559 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2560 i -= 10;
2561 }
2562
2563 CMOS_WRITE(save_control, RTC_CONTROL);
2564 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2565 clear_IO_APIC_pin(apic, pin);
2566
2567 ioapic_write_entry(apic, pin, entry0);
2568 }
2569
2570 static int disable_timer_pin_1 __initdata;
2571 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2572 static int __init disable_timer_pin_setup(char *arg)
2573 {
2574 disable_timer_pin_1 = 1;
2575 return 0;
2576 }
2577 early_param("disable_timer_pin_1", disable_timer_pin_setup);
2578
2579 int timer_through_8259 __initdata;
2580
2581 /*
2582 * This code may look a bit paranoid, but it's supposed to cooperate with
2583 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2584 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2585 * fanatically on his truly buggy board.
2586 *
2587 * FIXME: really need to revamp this for all platforms.
2588 */
2589 static inline void __init check_timer(void)
2590 {
2591 struct irq_cfg *cfg = irq_cfg(0);
2592 int apic1, pin1, apic2, pin2;
2593 unsigned long flags;
2594 unsigned int ver;
2595 int no_pin1 = 0;
2596
2597 local_irq_save(flags);
2598
2599 ver = apic_read(APIC_LVR);
2600 ver = GET_APIC_VERSION(ver);
2601
2602 /*
2603 * get/set the timer IRQ vector:
2604 */
2605 disable_8259A_irq(0);
2606 assign_irq_vector(0, TARGET_CPUS);
2607
2608 /*
2609 * As IRQ0 is to be enabled in the 8259A, the virtual
2610 * wire has to be disabled in the local APIC. Also
2611 * timer interrupts need to be acknowledged manually in
2612 * the 8259A for the i82489DX when using the NMI
2613 * watchdog as that APIC treats NMIs as level-triggered.
2614 * The AEOI mode will finish them in the 8259A
2615 * automatically.
2616 */
2617 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2618 init_8259A(1);
2619 #ifdef CONFIG_X86_32
2620 timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver));
2621 #endif
2622
2623 pin1 = find_isa_irq_pin(0, mp_INT);
2624 apic1 = find_isa_irq_apic(0, mp_INT);
2625 pin2 = ioapic_i8259.pin;
2626 apic2 = ioapic_i8259.apic;
2627
2628 apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
2629 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2630 cfg->vector, apic1, pin1, apic2, pin2);
2631
2632 /*
2633 * Some BIOS writers are clueless and report the ExtINTA
2634 * I/O APIC input from the cascaded 8259A as the timer
2635 * interrupt input. So just in case, if only one pin
2636 * was found above, try it both directly and through the
2637 * 8259A.
2638 */
2639 if (pin1 == -1) {
2640 #ifdef CONFIG_INTR_REMAP
2641 if (intr_remapping_enabled)
2642 panic("BIOS bug: timer not connected to IO-APIC");
2643 #endif
2644 pin1 = pin2;
2645 apic1 = apic2;
2646 no_pin1 = 1;
2647 } else if (pin2 == -1) {
2648 pin2 = pin1;
2649 apic2 = apic1;
2650 }
2651
2652 if (pin1 != -1) {
2653 /*
2654 * Ok, does IRQ0 through the IOAPIC work?
2655 */
2656 if (no_pin1) {
2657 add_pin_to_irq(0, apic1, pin1);
2658 setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
2659 }
2660 unmask_IO_APIC_irq(0);
2661 if (timer_irq_works()) {
2662 if (nmi_watchdog == NMI_IO_APIC) {
2663 setup_nmi();
2664 enable_8259A_irq(0);
2665 }
2666 if (disable_timer_pin_1 > 0)
2667 clear_IO_APIC_pin(0, pin1);
2668 goto out;
2669 }
2670 #ifdef CONFIG_INTR_REMAP
2671 if (intr_remapping_enabled)
2672 panic("timer doesn't work through Interrupt-remapped IO-APIC");
2673 #endif
2674 clear_IO_APIC_pin(apic1, pin1);
2675 if (!no_pin1)
2676 apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
2677 "8254 timer not connected to IO-APIC\n");
2678
2679 apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
2680 "(IRQ0) through the 8259A ...\n");
2681 apic_printk(APIC_QUIET, KERN_INFO
2682 "..... (found apic %d pin %d) ...\n", apic2, pin2);
2683 /*
2684 * legacy devices should be connected to IO APIC #0
2685 */
2686 replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
2687 setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
2688 unmask_IO_APIC_irq(0);
2689 enable_8259A_irq(0);
2690 if (timer_irq_works()) {
2691 apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
2692 timer_through_8259 = 1;
2693 if (nmi_watchdog == NMI_IO_APIC) {
2694 disable_8259A_irq(0);
2695 setup_nmi();
2696 enable_8259A_irq(0);
2697 }
2698 goto out;
2699 }
2700 /*
2701 * Cleanup, just in case ...
2702 */
2703 disable_8259A_irq(0);
2704 clear_IO_APIC_pin(apic2, pin2);
2705 apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
2706 }
2707
2708 if (nmi_watchdog == NMI_IO_APIC) {
2709 apic_printk(APIC_QUIET, KERN_WARNING "timer doesn't work "
2710 "through the IO-APIC - disabling NMI Watchdog!\n");
2711 nmi_watchdog = NMI_NONE;
2712 }
2713 #ifdef CONFIG_X86_32
2714 timer_ack = 0;
2715 #endif
2716
2717 apic_printk(APIC_QUIET, KERN_INFO
2718 "...trying to set up timer as Virtual Wire IRQ...\n");
2719
2720 lapic_register_intr(0);
2721 apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
2722 enable_8259A_irq(0);
2723
2724 if (timer_irq_works()) {
2725 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2726 goto out;
2727 }
2728 disable_8259A_irq(0);
2729 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
2730 apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
2731
2732 apic_printk(APIC_QUIET, KERN_INFO
2733 "...trying to set up timer as ExtINT IRQ...\n");
2734
2735 init_8259A(0);
2736 make_8259A_irq(0);
2737 apic_write(APIC_LVT0, APIC_DM_EXTINT);
2738
2739 unlock_ExtINT_logic();
2740
2741 if (timer_irq_works()) {
2742 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2743 goto out;
2744 }
2745 apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
2746 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
2747 "report. Then try booting with the 'noapic' option.\n");
2748 out:
2749 local_irq_restore(flags);
2750 }
2751
2752 /*
2753 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
2754 * to devices. However there may be an I/O APIC pin available for
2755 * this interrupt regardless. The pin may be left unconnected, but
2756 * typically it will be reused as an ExtINT cascade interrupt for
2757 * the master 8259A. In the MPS case such a pin will normally be
2758 * reported as an ExtINT interrupt in the MP table. With ACPI
2759 * there is no provision for ExtINT interrupts, and in the absence
2760 * of an override it would be treated as an ordinary ISA I/O APIC
2761 * interrupt, that is edge-triggered and unmasked by default. We
2762 * used to do this, but it caused problems on some systems because
2763 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
2764 * the same ExtINT cascade interrupt to drive the local APIC of the
2765 * bootstrap processor. Therefore we refrain from routing IRQ2 to
2766 * the I/O APIC in all cases now. No actual device should request
2767 * it anyway. --macro
2768 */
2769 #define PIC_IRQS (1 << PIC_CASCADE_IR)
2770
2771 void __init setup_IO_APIC(void)
2772 {
2773
2774 #ifdef CONFIG_X86_32
2775 enable_IO_APIC();
2776 #else
2777 /*
2778 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
2779 */
2780 #endif
2781
2782 io_apic_irqs = ~PIC_IRQS;
2783
2784 apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
2785 /*
2786 * Set up IO-APIC IRQ routing.
2787 */
2788 #ifdef CONFIG_X86_32
2789 if (!acpi_ioapic)
2790 setup_ioapic_ids_from_mpc();
2791 #endif
2792 sync_Arb_IDs();
2793 setup_IO_APIC_irqs();
2794 init_IO_APIC_traps();
2795 check_timer();
2796 }
2797
2798 /*
2799 * Called after all the initialization is done. If we didnt find any
2800 * APIC bugs then we can allow the modify fast path
2801 */
2802
2803 static int __init io_apic_bug_finalize(void)
2804 {
2805 if (sis_apic_bug == -1)
2806 sis_apic_bug = 0;
2807 return 0;
2808 }
2809
2810 late_initcall(io_apic_bug_finalize);
2811
2812 struct sysfs_ioapic_data {
2813 struct sys_device dev;
2814 struct IO_APIC_route_entry entry[0];
2815 };
2816 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
2817
2818 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
2819 {
2820 struct IO_APIC_route_entry *entry;
2821 struct sysfs_ioapic_data *data;
2822 int i;
2823
2824 data = container_of(dev, struct sysfs_ioapic_data, dev);
2825 entry = data->entry;
2826 for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
2827 *entry = ioapic_read_entry(dev->id, i);
2828
2829 return 0;
2830 }
2831
2832 static int ioapic_resume(struct sys_device *dev)
2833 {
2834 struct IO_APIC_route_entry *entry;
2835 struct sysfs_ioapic_data *data;
2836 unsigned long flags;
2837 union IO_APIC_reg_00 reg_00;
2838 int i;
2839
2840 data = container_of(dev, struct sysfs_ioapic_data, dev);
2841 entry = data->entry;
2842
2843 spin_lock_irqsave(&ioapic_lock, flags);
2844 reg_00.raw = io_apic_read(dev->id, 0);
2845 if (reg_00.bits.ID != mp_ioapics[dev->id].mp_apicid) {
2846 reg_00.bits.ID = mp_ioapics[dev->id].mp_apicid;
2847 io_apic_write(dev->id, 0, reg_00.raw);
2848 }
2849 spin_unlock_irqrestore(&ioapic_lock, flags);
2850 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
2851 ioapic_write_entry(dev->id, i, entry[i]);
2852
2853 return 0;
2854 }
2855
2856 static struct sysdev_class ioapic_sysdev_class = {
2857 .name = "ioapic",
2858 .suspend = ioapic_suspend,
2859 .resume = ioapic_resume,
2860 };
2861
2862 static int __init ioapic_init_sysfs(void)
2863 {
2864 struct sys_device * dev;
2865 int i, size, error;
2866
2867 error = sysdev_class_register(&ioapic_sysdev_class);
2868 if (error)
2869 return error;
2870
2871 for (i = 0; i < nr_ioapics; i++ ) {
2872 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
2873 * sizeof(struct IO_APIC_route_entry);
2874 mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
2875 if (!mp_ioapic_data[i]) {
2876 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2877 continue;
2878 }
2879 dev = &mp_ioapic_data[i]->dev;
2880 dev->id = i;
2881 dev->cls = &ioapic_sysdev_class;
2882 error = sysdev_register(dev);
2883 if (error) {
2884 kfree(mp_ioapic_data[i]);
2885 mp_ioapic_data[i] = NULL;
2886 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2887 continue;
2888 }
2889 }
2890
2891 return 0;
2892 }
2893
2894 device_initcall(ioapic_init_sysfs);
2895
2896 /*
2897 * Dynamic irq allocate and deallocation
2898 */
2899 unsigned int create_irq_nr(unsigned int irq_want)
2900 {
2901 /* Allocate an unused irq */
2902 unsigned int irq;
2903 unsigned int new;
2904 unsigned long flags;
2905 struct irq_cfg *cfg_new;
2906
2907 irq_want = nr_irqs - 1;
2908
2909 irq = 0;
2910 spin_lock_irqsave(&vector_lock, flags);
2911 for (new = irq_want; new > 0; new--) {
2912 if (platform_legacy_irq(new))
2913 continue;
2914 cfg_new = irq_cfg(new);
2915 if (cfg_new && cfg_new->vector != 0)
2916 continue;
2917 /* check if need to create one */
2918 if (!cfg_new)
2919 cfg_new = irq_cfg_alloc(new);
2920 if (__assign_irq_vector(new, TARGET_CPUS) == 0)
2921 irq = new;
2922 break;
2923 }
2924 spin_unlock_irqrestore(&vector_lock, flags);
2925
2926 if (irq > 0) {
2927 dynamic_irq_init(irq);
2928 }
2929 return irq;
2930 }
2931
2932 int create_irq(void)
2933 {
2934 int irq;
2935
2936 irq = create_irq_nr(nr_irqs - 1);
2937
2938 if (irq == 0)
2939 irq = -1;
2940
2941 return irq;
2942 }
2943
2944 void destroy_irq(unsigned int irq)
2945 {
2946 unsigned long flags;
2947
2948 dynamic_irq_cleanup(irq);
2949
2950 #ifdef CONFIG_INTR_REMAP
2951 free_irte(irq);
2952 #endif
2953 spin_lock_irqsave(&vector_lock, flags);
2954 __clear_irq_vector(irq);
2955 spin_unlock_irqrestore(&vector_lock, flags);
2956 }
2957
2958 /*
2959 * MSI message composition
2960 */
2961 #ifdef CONFIG_PCI_MSI
2962 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
2963 {
2964 struct irq_cfg *cfg;
2965 int err;
2966 unsigned dest;
2967 cpumask_t tmp;
2968
2969 tmp = TARGET_CPUS;
2970 err = assign_irq_vector(irq, tmp);
2971 if (err)
2972 return err;
2973
2974 cfg = irq_cfg(irq);
2975 cpus_and(tmp, cfg->domain, tmp);
2976 dest = cpu_mask_to_apicid(tmp);
2977
2978 #ifdef CONFIG_INTR_REMAP
2979 if (irq_remapped(irq)) {
2980 struct irte irte;
2981 int ir_index;
2982 u16 sub_handle;
2983
2984 ir_index = map_irq_to_irte_handle(irq, &sub_handle);
2985 BUG_ON(ir_index == -1);
2986
2987 memset (&irte, 0, sizeof(irte));
2988
2989 irte.present = 1;
2990 irte.dst_mode = INT_DEST_MODE;
2991 irte.trigger_mode = 0; /* edge */
2992 irte.dlvry_mode = INT_DELIVERY_MODE;
2993 irte.vector = cfg->vector;
2994 irte.dest_id = IRTE_DEST(dest);
2995
2996 modify_irte(irq, &irte);
2997
2998 msg->address_hi = MSI_ADDR_BASE_HI;
2999 msg->data = sub_handle;
3000 msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
3001 MSI_ADDR_IR_SHV |
3002 MSI_ADDR_IR_INDEX1(ir_index) |
3003 MSI_ADDR_IR_INDEX2(ir_index);
3004 } else
3005 #endif
3006 {
3007 msg->address_hi = MSI_ADDR_BASE_HI;
3008 msg->address_lo =
3009 MSI_ADDR_BASE_LO |
3010 ((INT_DEST_MODE == 0) ?
3011 MSI_ADDR_DEST_MODE_PHYSICAL:
3012 MSI_ADDR_DEST_MODE_LOGICAL) |
3013 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
3014 MSI_ADDR_REDIRECTION_CPU:
3015 MSI_ADDR_REDIRECTION_LOWPRI) |
3016 MSI_ADDR_DEST_ID(dest);
3017
3018 msg->data =
3019 MSI_DATA_TRIGGER_EDGE |
3020 MSI_DATA_LEVEL_ASSERT |
3021 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
3022 MSI_DATA_DELIVERY_FIXED:
3023 MSI_DATA_DELIVERY_LOWPRI) |
3024 MSI_DATA_VECTOR(cfg->vector);
3025 }
3026 return err;
3027 }
3028
3029 #ifdef CONFIG_SMP
3030 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
3031 {
3032 struct irq_cfg *cfg;
3033 struct msi_msg msg;
3034 unsigned int dest;
3035 cpumask_t tmp;
3036 struct irq_desc *desc;
3037
3038 cpus_and(tmp, mask, cpu_online_map);
3039 if (cpus_empty(tmp))
3040 return;
3041
3042 if (assign_irq_vector(irq, mask))
3043 return;
3044
3045 cfg = irq_cfg(irq);
3046 cpus_and(tmp, cfg->domain, mask);
3047 dest = cpu_mask_to_apicid(tmp);
3048
3049 read_msi_msg(irq, &msg);
3050
3051 msg.data &= ~MSI_DATA_VECTOR_MASK;
3052 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3053 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3054 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3055
3056 write_msi_msg(irq, &msg);
3057 desc = irq_to_desc(irq);
3058 desc->affinity = mask;
3059 }
3060
3061 #ifdef CONFIG_INTR_REMAP
3062 /*
3063 * Migrate the MSI irq to another cpumask. This migration is
3064 * done in the process context using interrupt-remapping hardware.
3065 */
3066 static void ir_set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
3067 {
3068 struct irq_cfg *cfg;
3069 unsigned int dest;
3070 cpumask_t tmp, cleanup_mask;
3071 struct irte irte;
3072 struct irq_desc *desc;
3073
3074 cpus_and(tmp, mask, cpu_online_map);
3075 if (cpus_empty(tmp))
3076 return;
3077
3078 if (get_irte(irq, &irte))
3079 return;
3080
3081 if (assign_irq_vector(irq, mask))
3082 return;
3083
3084 cfg = irq_cfg(irq);
3085 cpus_and(tmp, cfg->domain, mask);
3086 dest = cpu_mask_to_apicid(tmp);
3087
3088 irte.vector = cfg->vector;
3089 irte.dest_id = IRTE_DEST(dest);
3090
3091 /*
3092 * atomically update the IRTE with the new destination and vector.
3093 */
3094 modify_irte(irq, &irte);
3095
3096 /*
3097 * After this point, all the interrupts will start arriving
3098 * at the new destination. So, time to cleanup the previous
3099 * vector allocation.
3100 */
3101 if (cfg->move_in_progress) {
3102 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
3103 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
3104 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
3105 cfg->move_in_progress = 0;
3106 }
3107
3108 desc = irq_to_desc(irq);
3109 desc->affinity = mask;
3110 }
3111 #endif
3112 #endif /* CONFIG_SMP */
3113
3114 /*
3115 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
3116 * which implement the MSI or MSI-X Capability Structure.
3117 */
3118 static struct irq_chip msi_chip = {
3119 .name = "PCI-MSI",
3120 .unmask = unmask_msi_irq,
3121 .mask = mask_msi_irq,
3122 .ack = ack_apic_edge,
3123 #ifdef CONFIG_SMP
3124 .set_affinity = set_msi_irq_affinity,
3125 #endif
3126 .retrigger = ioapic_retrigger_irq,
3127 };
3128
3129 #ifdef CONFIG_INTR_REMAP
3130 static struct irq_chip msi_ir_chip = {
3131 .name = "IR-PCI-MSI",
3132 .unmask = unmask_msi_irq,
3133 .mask = mask_msi_irq,
3134 .ack = ack_x2apic_edge,
3135 #ifdef CONFIG_SMP
3136 .set_affinity = ir_set_msi_irq_affinity,
3137 #endif
3138 .retrigger = ioapic_retrigger_irq,
3139 };
3140
3141 /*
3142 * Map the PCI dev to the corresponding remapping hardware unit
3143 * and allocate 'nvec' consecutive interrupt-remapping table entries
3144 * in it.
3145 */
3146 static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
3147 {
3148 struct intel_iommu *iommu;
3149 int index;
3150
3151 iommu = map_dev_to_ir(dev);
3152 if (!iommu) {
3153 printk(KERN_ERR
3154 "Unable to map PCI %s to iommu\n", pci_name(dev));
3155 return -ENOENT;
3156 }
3157
3158 index = alloc_irte(iommu, irq, nvec);
3159 if (index < 0) {
3160 printk(KERN_ERR
3161 "Unable to allocate %d IRTE for PCI %s\n", nvec,
3162 pci_name(dev));
3163 return -ENOSPC;
3164 }
3165 return index;
3166 }
3167 #endif
3168
3169 static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc, int irq)
3170 {
3171 int ret;
3172 struct msi_msg msg;
3173
3174 ret = msi_compose_msg(dev, irq, &msg);
3175 if (ret < 0)
3176 return ret;
3177
3178 set_irq_msi(irq, desc);
3179 write_msi_msg(irq, &msg);
3180
3181 #ifdef CONFIG_INTR_REMAP
3182 if (irq_remapped(irq)) {
3183 struct irq_desc *desc = irq_to_desc(irq);
3184 /*
3185 * irq migration in process context
3186 */
3187 desc->status |= IRQ_MOVE_PCNTXT;
3188 set_irq_chip_and_handler_name(irq, &msi_ir_chip, handle_edge_irq, "edge");
3189 } else
3190 #endif
3191 set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
3192
3193 dev_printk(KERN_DEBUG, &dev->dev, "irq %d for MSI/MSI-X\n", irq);
3194
3195 return 0;
3196 }
3197
3198 static unsigned int build_irq_for_pci_dev(struct pci_dev *dev)
3199 {
3200 unsigned int irq;
3201
3202 irq = dev->bus->number;
3203 irq <<= 8;
3204 irq |= dev->devfn;
3205 irq <<= 12;
3206
3207 return irq;
3208 }
3209
3210 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
3211 {
3212 unsigned int irq;
3213 int ret;
3214 unsigned int irq_want;
3215
3216 irq_want = build_irq_for_pci_dev(dev) + 0x100;
3217
3218 irq = create_irq_nr(irq_want);
3219 if (irq == 0)
3220 return -1;
3221
3222 #ifdef CONFIG_INTR_REMAP
3223 if (!intr_remapping_enabled)
3224 goto no_ir;
3225
3226 ret = msi_alloc_irte(dev, irq, 1);
3227 if (ret < 0)
3228 goto error;
3229 no_ir:
3230 #endif
3231 ret = setup_msi_irq(dev, desc, irq);
3232 if (ret < 0) {
3233 destroy_irq(irq);
3234 return ret;
3235 }
3236 return 0;
3237
3238 #ifdef CONFIG_INTR_REMAP
3239 error:
3240 destroy_irq(irq);
3241 return ret;
3242 #endif
3243 }
3244
3245 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
3246 {
3247 unsigned int irq;
3248 int ret, sub_handle;
3249 struct msi_desc *desc;
3250 unsigned int irq_want;
3251
3252 #ifdef CONFIG_INTR_REMAP
3253 struct intel_iommu *iommu = 0;
3254 int index = 0;
3255 #endif
3256
3257 irq_want = build_irq_for_pci_dev(dev) + 0x100;
3258 sub_handle = 0;
3259 list_for_each_entry(desc, &dev->msi_list, list) {
3260 irq = create_irq_nr(irq_want--);
3261 if (irq == 0)
3262 return -1;
3263 #ifdef CONFIG_INTR_REMAP
3264 if (!intr_remapping_enabled)
3265 goto no_ir;
3266
3267 if (!sub_handle) {
3268 /*
3269 * allocate the consecutive block of IRTE's
3270 * for 'nvec'
3271 */
3272 index = msi_alloc_irte(dev, irq, nvec);
3273 if (index < 0) {
3274 ret = index;
3275 goto error;
3276 }
3277 } else {
3278 iommu = map_dev_to_ir(dev);
3279 if (!iommu) {
3280 ret = -ENOENT;
3281 goto error;
3282 }
3283 /*
3284 * setup the mapping between the irq and the IRTE
3285 * base index, the sub_handle pointing to the
3286 * appropriate interrupt remap table entry.
3287 */
3288 set_irte_irq(irq, iommu, index, sub_handle);
3289 }
3290 no_ir:
3291 #endif
3292 ret = setup_msi_irq(dev, desc, irq);
3293 if (ret < 0)
3294 goto error;
3295 sub_handle++;
3296 }
3297 return 0;
3298
3299 error:
3300 destroy_irq(irq);
3301 return ret;
3302 }
3303
3304 void arch_teardown_msi_irq(unsigned int irq)
3305 {
3306 destroy_irq(irq);
3307 }
3308
3309 #ifdef CONFIG_DMAR
3310 #ifdef CONFIG_SMP
3311 static void dmar_msi_set_affinity(unsigned int irq, cpumask_t mask)
3312 {
3313 struct irq_cfg *cfg;
3314 struct msi_msg msg;
3315 unsigned int dest;
3316 cpumask_t tmp;
3317 struct irq_desc *desc;
3318
3319 cpus_and(tmp, mask, cpu_online_map);
3320 if (cpus_empty(tmp))
3321 return;
3322
3323 if (assign_irq_vector(irq, mask))
3324 return;
3325
3326 cfg = irq_cfg(irq);
3327 cpus_and(tmp, cfg->domain, mask);
3328 dest = cpu_mask_to_apicid(tmp);
3329
3330 dmar_msi_read(irq, &msg);
3331
3332 msg.data &= ~MSI_DATA_VECTOR_MASK;
3333 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3334 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3335 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3336
3337 dmar_msi_write(irq, &msg);
3338 desc = irq_to_desc(irq);
3339 desc->affinity = mask;
3340 }
3341 #endif /* CONFIG_SMP */
3342
3343 struct irq_chip dmar_msi_type = {
3344 .name = "DMAR_MSI",
3345 .unmask = dmar_msi_unmask,
3346 .mask = dmar_msi_mask,
3347 .ack = ack_apic_edge,
3348 #ifdef CONFIG_SMP
3349 .set_affinity = dmar_msi_set_affinity,
3350 #endif
3351 .retrigger = ioapic_retrigger_irq,
3352 };
3353
3354 int arch_setup_dmar_msi(unsigned int irq)
3355 {
3356 int ret;
3357 struct msi_msg msg;
3358
3359 ret = msi_compose_msg(NULL, irq, &msg);
3360 if (ret < 0)
3361 return ret;
3362 dmar_msi_write(irq, &msg);
3363 set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
3364 "edge");
3365 return 0;
3366 }
3367 #endif
3368
3369 #ifdef CONFIG_HPET_TIMER
3370
3371 #ifdef CONFIG_SMP
3372 static void hpet_msi_set_affinity(unsigned int irq, cpumask_t mask)
3373 {
3374 struct irq_cfg *cfg;
3375 struct irq_desc *desc;
3376 struct msi_msg msg;
3377 unsigned int dest;
3378 cpumask_t tmp;
3379
3380 cpus_and(tmp, mask, cpu_online_map);
3381 if (cpus_empty(tmp))
3382 return;
3383
3384 if (assign_irq_vector(irq, mask))
3385 return;
3386
3387 cfg = irq_cfg(irq);
3388 cpus_and(tmp, cfg->domain, mask);
3389 dest = cpu_mask_to_apicid(tmp);
3390
3391 hpet_msi_read(irq, &msg);
3392
3393 msg.data &= ~MSI_DATA_VECTOR_MASK;
3394 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3395 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3396 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3397
3398 hpet_msi_write(irq, &msg);
3399 desc = irq_to_desc(irq);
3400 desc->affinity = mask;
3401 }
3402 #endif /* CONFIG_SMP */
3403
3404 struct irq_chip hpet_msi_type = {
3405 .name = "HPET_MSI",
3406 .unmask = hpet_msi_unmask,
3407 .mask = hpet_msi_mask,
3408 .ack = ack_apic_edge,
3409 #ifdef CONFIG_SMP
3410 .set_affinity = hpet_msi_set_affinity,
3411 #endif
3412 .retrigger = ioapic_retrigger_irq,
3413 };
3414
3415 int arch_setup_hpet_msi(unsigned int irq)
3416 {
3417 int ret;
3418 struct msi_msg msg;
3419
3420 ret = msi_compose_msg(NULL, irq, &msg);
3421 if (ret < 0)
3422 return ret;
3423
3424 hpet_msi_write(irq, &msg);
3425 set_irq_chip_and_handler_name(irq, &hpet_msi_type, handle_edge_irq,
3426 "edge");
3427
3428 return 0;
3429 }
3430 #endif
3431
3432 #endif /* CONFIG_PCI_MSI */
3433 /*
3434 * Hypertransport interrupt support
3435 */
3436 #ifdef CONFIG_HT_IRQ
3437
3438 #ifdef CONFIG_SMP
3439
3440 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
3441 {
3442 struct ht_irq_msg msg;
3443 fetch_ht_irq_msg(irq, &msg);
3444
3445 msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
3446 msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
3447
3448 msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
3449 msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
3450
3451 write_ht_irq_msg(irq, &msg);
3452 }
3453
3454 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
3455 {
3456 struct irq_cfg *cfg;
3457 unsigned int dest;
3458 cpumask_t tmp;
3459 struct irq_desc *desc;
3460
3461 cpus_and(tmp, mask, cpu_online_map);
3462 if (cpus_empty(tmp))
3463 return;
3464
3465 if (assign_irq_vector(irq, mask))
3466 return;
3467
3468 cfg = irq_cfg(irq);
3469 cpus_and(tmp, cfg->domain, mask);
3470 dest = cpu_mask_to_apicid(tmp);
3471
3472 target_ht_irq(irq, dest, cfg->vector);
3473 desc = irq_to_desc(irq);
3474 desc->affinity = mask;
3475 }
3476 #endif
3477
3478 static struct irq_chip ht_irq_chip = {
3479 .name = "PCI-HT",
3480 .mask = mask_ht_irq,
3481 .unmask = unmask_ht_irq,
3482 .ack = ack_apic_edge,
3483 #ifdef CONFIG_SMP
3484 .set_affinity = set_ht_irq_affinity,
3485 #endif
3486 .retrigger = ioapic_retrigger_irq,
3487 };
3488
3489 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
3490 {
3491 struct irq_cfg *cfg;
3492 int err;
3493 cpumask_t tmp;
3494
3495 tmp = TARGET_CPUS;
3496 err = assign_irq_vector(irq, tmp);
3497 if (!err) {
3498 struct ht_irq_msg msg;
3499 unsigned dest;
3500
3501 cfg = irq_cfg(irq);
3502 cpus_and(tmp, cfg->domain, tmp);
3503 dest = cpu_mask_to_apicid(tmp);
3504
3505 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
3506
3507 msg.address_lo =
3508 HT_IRQ_LOW_BASE |
3509 HT_IRQ_LOW_DEST_ID(dest) |
3510 HT_IRQ_LOW_VECTOR(cfg->vector) |
3511 ((INT_DEST_MODE == 0) ?
3512 HT_IRQ_LOW_DM_PHYSICAL :
3513 HT_IRQ_LOW_DM_LOGICAL) |
3514 HT_IRQ_LOW_RQEOI_EDGE |
3515 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
3516 HT_IRQ_LOW_MT_FIXED :
3517 HT_IRQ_LOW_MT_ARBITRATED) |
3518 HT_IRQ_LOW_IRQ_MASKED;
3519
3520 write_ht_irq_msg(irq, &msg);
3521
3522 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
3523 handle_edge_irq, "edge");
3524
3525 dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq);
3526 }
3527 return err;
3528 }
3529 #endif /* CONFIG_HT_IRQ */
3530
3531 #ifdef CONFIG_X86_64
3532 /*
3533 * Re-target the irq to the specified CPU and enable the specified MMR located
3534 * on the specified blade to allow the sending of MSIs to the specified CPU.
3535 */
3536 int arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
3537 unsigned long mmr_offset)
3538 {
3539 const cpumask_t *eligible_cpu = get_cpu_mask(cpu);
3540 struct irq_cfg *cfg;
3541 int mmr_pnode;
3542 unsigned long mmr_value;
3543 struct uv_IO_APIC_route_entry *entry;
3544 unsigned long flags;
3545 int err;
3546
3547 err = assign_irq_vector(irq, *eligible_cpu);
3548 if (err != 0)
3549 return err;
3550
3551 spin_lock_irqsave(&vector_lock, flags);
3552 set_irq_chip_and_handler_name(irq, &uv_irq_chip, handle_percpu_irq,
3553 irq_name);
3554 spin_unlock_irqrestore(&vector_lock, flags);
3555
3556 cfg = irq_cfg(irq);
3557
3558 mmr_value = 0;
3559 entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
3560 BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long));
3561
3562 entry->vector = cfg->vector;
3563 entry->delivery_mode = INT_DELIVERY_MODE;
3564 entry->dest_mode = INT_DEST_MODE;
3565 entry->polarity = 0;
3566 entry->trigger = 0;
3567 entry->mask = 0;
3568 entry->dest = cpu_mask_to_apicid(*eligible_cpu);
3569
3570 mmr_pnode = uv_blade_to_pnode(mmr_blade);
3571 uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
3572
3573 return irq;
3574 }
3575
3576 /*
3577 * Disable the specified MMR located on the specified blade so that MSIs are
3578 * longer allowed to be sent.
3579 */
3580 void arch_disable_uv_irq(int mmr_blade, unsigned long mmr_offset)
3581 {
3582 unsigned long mmr_value;
3583 struct uv_IO_APIC_route_entry *entry;
3584 int mmr_pnode;
3585
3586 mmr_value = 0;
3587 entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
3588 BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long));
3589
3590 entry->mask = 1;
3591
3592 mmr_pnode = uv_blade_to_pnode(mmr_blade);
3593 uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
3594 }
3595 #endif /* CONFIG_X86_64 */
3596
3597 int __init io_apic_get_redir_entries (int ioapic)
3598 {
3599 union IO_APIC_reg_01 reg_01;
3600 unsigned long flags;
3601
3602 spin_lock_irqsave(&ioapic_lock, flags);
3603 reg_01.raw = io_apic_read(ioapic, 1);
3604 spin_unlock_irqrestore(&ioapic_lock, flags);
3605
3606 return reg_01.bits.entries;
3607 }
3608
3609 int __init probe_nr_irqs(void)
3610 {
3611 return NR_IRQS;
3612 }
3613
3614 /* --------------------------------------------------------------------------
3615 ACPI-based IOAPIC Configuration
3616 -------------------------------------------------------------------------- */
3617
3618 #ifdef CONFIG_ACPI
3619
3620 #ifdef CONFIG_X86_32
3621 int __init io_apic_get_unique_id(int ioapic, int apic_id)
3622 {
3623 union IO_APIC_reg_00 reg_00;
3624 static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
3625 physid_mask_t tmp;
3626 unsigned long flags;
3627 int i = 0;
3628
3629 /*
3630 * The P4 platform supports up to 256 APIC IDs on two separate APIC
3631 * buses (one for LAPICs, one for IOAPICs), where predecessors only
3632 * supports up to 16 on one shared APIC bus.
3633 *
3634 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
3635 * advantage of new APIC bus architecture.
3636 */
3637
3638 if (physids_empty(apic_id_map))
3639 apic_id_map = ioapic_phys_id_map(phys_cpu_present_map);
3640
3641 spin_lock_irqsave(&ioapic_lock, flags);
3642 reg_00.raw = io_apic_read(ioapic, 0);
3643 spin_unlock_irqrestore(&ioapic_lock, flags);
3644
3645 if (apic_id >= get_physical_broadcast()) {
3646 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
3647 "%d\n", ioapic, apic_id, reg_00.bits.ID);
3648 apic_id = reg_00.bits.ID;
3649 }
3650
3651 /*
3652 * Every APIC in a system must have a unique ID or we get lots of nice
3653 * 'stuck on smp_invalidate_needed IPI wait' messages.
3654 */
3655 if (check_apicid_used(apic_id_map, apic_id)) {
3656
3657 for (i = 0; i < get_physical_broadcast(); i++) {
3658 if (!check_apicid_used(apic_id_map, i))
3659 break;
3660 }
3661
3662 if (i == get_physical_broadcast())
3663 panic("Max apic_id exceeded!\n");
3664
3665 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
3666 "trying %d\n", ioapic, apic_id, i);
3667
3668 apic_id = i;
3669 }
3670
3671 tmp = apicid_to_cpu_present(apic_id);
3672 physids_or(apic_id_map, apic_id_map, tmp);
3673
3674 if (reg_00.bits.ID != apic_id) {
3675 reg_00.bits.ID = apic_id;
3676
3677 spin_lock_irqsave(&ioapic_lock, flags);
3678 io_apic_write(ioapic, 0, reg_00.raw);
3679 reg_00.raw = io_apic_read(ioapic, 0);
3680 spin_unlock_irqrestore(&ioapic_lock, flags);
3681
3682 /* Sanity check */
3683 if (reg_00.bits.ID != apic_id) {
3684 printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
3685 return -1;
3686 }
3687 }
3688
3689 apic_printk(APIC_VERBOSE, KERN_INFO
3690 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
3691
3692 return apic_id;
3693 }
3694
3695 int __init io_apic_get_version(int ioapic)
3696 {
3697 union IO_APIC_reg_01 reg_01;
3698 unsigned long flags;
3699
3700 spin_lock_irqsave(&ioapic_lock, flags);
3701 reg_01.raw = io_apic_read(ioapic, 1);
3702 spin_unlock_irqrestore(&ioapic_lock, flags);
3703
3704 return reg_01.bits.version;
3705 }
3706 #endif
3707
3708 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
3709 {
3710 if (!IO_APIC_IRQ(irq)) {
3711 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
3712 ioapic);
3713 return -EINVAL;
3714 }
3715
3716 /*
3717 * IRQs < 16 are already in the irq_2_pin[] map
3718 */
3719 if (irq >= 16)
3720 add_pin_to_irq(irq, ioapic, pin);
3721
3722 setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
3723
3724 return 0;
3725 }
3726
3727
3728 int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
3729 {
3730 int i;
3731
3732 if (skip_ioapic_setup)
3733 return -1;
3734
3735 for (i = 0; i < mp_irq_entries; i++)
3736 if (mp_irqs[i].mp_irqtype == mp_INT &&
3737 mp_irqs[i].mp_srcbusirq == bus_irq)
3738 break;
3739 if (i >= mp_irq_entries)
3740 return -1;
3741
3742 *trigger = irq_trigger(i);
3743 *polarity = irq_polarity(i);
3744 return 0;
3745 }
3746
3747 #endif /* CONFIG_ACPI */
3748
3749 /*
3750 * This function currently is only a helper for the i386 smp boot process where
3751 * we need to reprogram the ioredtbls to cater for the cpus which have come online
3752 * so mask in all cases should simply be TARGET_CPUS
3753 */
3754 #ifdef CONFIG_SMP
3755 void __init setup_ioapic_dest(void)
3756 {
3757 int pin, ioapic, irq, irq_entry;
3758 struct irq_desc *desc;
3759 struct irq_cfg *cfg;
3760 cpumask_t mask;
3761
3762 if (skip_ioapic_setup == 1)
3763 return;
3764
3765 for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
3766 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
3767 irq_entry = find_irq_entry(ioapic, pin, mp_INT);
3768 if (irq_entry == -1)
3769 continue;
3770 irq = pin_2_irq(irq_entry, ioapic, pin);
3771
3772 /* setup_IO_APIC_irqs could fail to get vector for some device
3773 * when you have too many devices, because at that time only boot
3774 * cpu is online.
3775 */
3776 cfg = irq_cfg(irq);
3777 if (!cfg->vector) {
3778 setup_IO_APIC_irq(ioapic, pin, irq,
3779 irq_trigger(irq_entry),
3780 irq_polarity(irq_entry));
3781 continue;
3782
3783 }
3784
3785 /*
3786 * Honour affinities which have been set in early boot
3787 */
3788 desc = irq_to_desc(irq);
3789 if (desc->status &
3790 (IRQ_NO_BALANCING | IRQ_AFFINITY_SET))
3791 mask = desc->affinity;
3792 else
3793 mask = TARGET_CPUS;
3794
3795 #ifdef CONFIG_INTR_REMAP
3796 if (intr_remapping_enabled)
3797 set_ir_ioapic_affinity_irq(irq, mask);
3798 else
3799 #endif
3800 set_ioapic_affinity_irq(irq, mask);
3801 }
3802
3803 }
3804 }
3805 #endif
3806
3807 #define IOAPIC_RESOURCE_NAME_SIZE 11
3808
3809 static struct resource *ioapic_resources;
3810
3811 static struct resource * __init ioapic_setup_resources(void)
3812 {
3813 unsigned long n;
3814 struct resource *res;
3815 char *mem;
3816 int i;
3817
3818 if (nr_ioapics <= 0)
3819 return NULL;
3820
3821 n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
3822 n *= nr_ioapics;
3823
3824 mem = alloc_bootmem(n);
3825 res = (void *)mem;
3826
3827 if (mem != NULL) {
3828 mem += sizeof(struct resource) * nr_ioapics;
3829
3830 for (i = 0; i < nr_ioapics; i++) {
3831 res[i].name = mem;
3832 res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
3833 sprintf(mem, "IOAPIC %u", i);
3834 mem += IOAPIC_RESOURCE_NAME_SIZE;
3835 }
3836 }
3837
3838 ioapic_resources = res;
3839
3840 return res;
3841 }
3842
3843 void __init ioapic_init_mappings(void)
3844 {
3845 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
3846 struct resource *ioapic_res;
3847 int i;
3848
3849 irq_2_pin_init();
3850 ioapic_res = ioapic_setup_resources();
3851 for (i = 0; i < nr_ioapics; i++) {
3852 if (smp_found_config) {
3853 ioapic_phys = mp_ioapics[i].mp_apicaddr;
3854 #ifdef CONFIG_X86_32
3855 if (!ioapic_phys) {
3856 printk(KERN_ERR
3857 "WARNING: bogus zero IO-APIC "
3858 "address found in MPTABLE, "
3859 "disabling IO/APIC support!\n");
3860 smp_found_config = 0;
3861 skip_ioapic_setup = 1;
3862 goto fake_ioapic_page;
3863 }
3864 #endif
3865 } else {
3866 #ifdef CONFIG_X86_32
3867 fake_ioapic_page:
3868 #endif
3869 ioapic_phys = (unsigned long)
3870 alloc_bootmem_pages(PAGE_SIZE);
3871 ioapic_phys = __pa(ioapic_phys);
3872 }
3873 set_fixmap_nocache(idx, ioapic_phys);
3874 apic_printk(APIC_VERBOSE,
3875 "mapped IOAPIC to %08lx (%08lx)\n",
3876 __fix_to_virt(idx), ioapic_phys);
3877 idx++;
3878
3879 if (ioapic_res != NULL) {
3880 ioapic_res->start = ioapic_phys;
3881 ioapic_res->end = ioapic_phys + (4 * 1024) - 1;
3882 ioapic_res++;
3883 }
3884 }
3885 }
3886
3887 static int __init ioapic_insert_resources(void)
3888 {
3889 int i;
3890 struct resource *r = ioapic_resources;
3891
3892 if (!r) {
3893 printk(KERN_ERR
3894 "IO APIC resources could be not be allocated.\n");
3895 return -1;
3896 }
3897
3898 for (i = 0; i < nr_ioapics; i++) {
3899 insert_resource(&iomem_resource, r);
3900 r++;
3901 }
3902
3903 return 0;
3904 }
3905
3906 /* Insert the IO APIC resources after PCI initialization has occured to handle
3907 * IO APICS that are mapped in on a BAR in PCI space. */
3908 late_initcall(ioapic_insert_resources);
Linux with added FPC-III support