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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel IO-APIC support for multi-Pentium hosts.
4 *
5 * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
6 *
7 * Many thanks to Stig Venaas for trying out countless experimental
8 * patches and reporting/debugging problems patiently!
9 *
10 * (c) 1999, Multiple IO-APIC support, developed by
11 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
12 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
13 * further tested and cleaned up by Zach Brown <zab@redhat.com>
14 * and Ingo Molnar <mingo@redhat.com>
15 *
16 * Fixes
17 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
18 * thanks to Eric Gilmore
19 * and Rolf G. Tews
20 * for testing these extensively
21 * Paul Diefenbaugh : Added full ACPI support
22 *
23 * Historical information which is worth to be preserved:
24 *
25 * - SiS APIC rmw bug:
26 *
27 * We used to have a workaround for a bug in SiS chips which
28 * required to rewrite the index register for a read-modify-write
29 * operation as the chip lost the index information which was
30 * setup for the read already. We cache the data now, so that
31 * workaround has been removed.
32 */
33
34#include <linux/mm.h>
35#include <linux/interrupt.h>
36#include <linux/irq.h>
37#include <linux/init.h>
38#include <linux/delay.h>
39#include <linux/sched.h>
40#include <linux/pci.h>
41#include <linux/mc146818rtc.h>
42#include <linux/compiler.h>
43#include <linux/acpi.h>
44#include <linux/export.h>
45#include <linux/syscore_ops.h>
46#include <linux/freezer.h>
47#include <linux/kthread.h>
48#include <linux/jiffies.h> /* time_after() */
49#include <linux/slab.h>
50#include <linux/memblock.h>
51
52#include <asm/irqdomain.h>
53#include <asm/io.h>
54#include <asm/smp.h>
55#include <asm/cpu.h>
56#include <asm/desc.h>
57#include <asm/proto.h>
58#include <asm/acpi.h>
59#include <asm/dma.h>
60#include <asm/timer.h>
61#include <asm/time.h>
62#include <asm/i8259.h>
63#include <asm/setup.h>
64#include <asm/irq_remapping.h>
65#include <asm/hw_irq.h>
66
67#include <asm/apic.h>
68
69#define for_each_ioapic(idx) \
70 for ((idx) = 0; (idx) < nr_ioapics; (idx)++)
71#define for_each_ioapic_reverse(idx) \
72 for ((idx) = nr_ioapics - 1; (idx) >= 0; (idx)--)
73#define for_each_pin(idx, pin) \
74 for ((pin) = 0; (pin) < ioapics[(idx)].nr_registers; (pin)++)
75#define for_each_ioapic_pin(idx, pin) \
76 for_each_ioapic((idx)) \
77 for_each_pin((idx), (pin))
78#define for_each_irq_pin(entry, head) \
79 list_for_each_entry(entry, &head, list)
80
81static DEFINE_RAW_SPINLOCK(ioapic_lock);
82static DEFINE_MUTEX(ioapic_mutex);
83static unsigned int ioapic_dynirq_base;
84static int ioapic_initialized;
85
86struct irq_pin_list {
87 struct list_head list;
88 int apic, pin;
89};
90
91struct mp_chip_data {
92 struct list_head irq_2_pin;
93 struct IO_APIC_route_entry entry;
94 int trigger;
95 int polarity;
96 u32 count;
97 bool isa_irq;
98};
99
100struct mp_ioapic_gsi {
101 u32 gsi_base;
102 u32 gsi_end;
103};
104
105static struct ioapic {
106 /*
107 * # of IRQ routing registers
108 */
109 int nr_registers;
110 /*
111 * Saved state during suspend/resume, or while enabling intr-remap.
112 */
113 struct IO_APIC_route_entry *saved_registers;
114 /* I/O APIC config */
115 struct mpc_ioapic mp_config;
116 /* IO APIC gsi routing info */
117 struct mp_ioapic_gsi gsi_config;
118 struct ioapic_domain_cfg irqdomain_cfg;
119 struct irq_domain *irqdomain;
120 struct resource *iomem_res;
121} ioapics[MAX_IO_APICS];
122
123#define mpc_ioapic_ver(ioapic_idx) ioapics[ioapic_idx].mp_config.apicver
124
125int mpc_ioapic_id(int ioapic_idx)
126{
127 return ioapics[ioapic_idx].mp_config.apicid;
128}
129
130unsigned int mpc_ioapic_addr(int ioapic_idx)
131{
132 return ioapics[ioapic_idx].mp_config.apicaddr;
133}
134
135static inline struct mp_ioapic_gsi *mp_ioapic_gsi_routing(int ioapic_idx)
136{
137 return &ioapics[ioapic_idx].gsi_config;
138}
139
140static inline int mp_ioapic_pin_count(int ioapic)
141{
142 struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
143
144 return gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
145}
146
147static inline u32 mp_pin_to_gsi(int ioapic, int pin)
148{
149 return mp_ioapic_gsi_routing(ioapic)->gsi_base + pin;
150}
151
152static inline bool mp_is_legacy_irq(int irq)
153{
154 return irq >= 0 && irq < nr_legacy_irqs();
155}
156
157/*
158 * Initialize all legacy IRQs and all pins on the first IOAPIC
159 * if we have legacy interrupt controller. Kernel boot option "pirq="
160 * may rely on non-legacy pins on the first IOAPIC.
161 */
162static inline int mp_init_irq_at_boot(int ioapic, int irq)
163{
164 if (!nr_legacy_irqs())
165 return 0;
166
167 return ioapic == 0 || mp_is_legacy_irq(irq);
168}
169
170static inline struct irq_domain *mp_ioapic_irqdomain(int ioapic)
171{
172 return ioapics[ioapic].irqdomain;
173}
174
175int nr_ioapics;
176
177/* The one past the highest gsi number used */
178u32 gsi_top;
179
180/* MP IRQ source entries */
181struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
182
183/* # of MP IRQ source entries */
184int mp_irq_entries;
185
186#ifdef CONFIG_EISA
187int mp_bus_id_to_type[MAX_MP_BUSSES];
188#endif
189
190DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
191
192int skip_ioapic_setup;
193
194/**
195 * disable_ioapic_support() - disables ioapic support at runtime
196 */
197void disable_ioapic_support(void)
198{
199#ifdef CONFIG_PCI
200 noioapicquirk = 1;
201 noioapicreroute = -1;
202#endif
203 skip_ioapic_setup = 1;
204}
205
206static int __init parse_noapic(char *str)
207{
208 /* disable IO-APIC */
209 disable_ioapic_support();
210 return 0;
211}
212early_param("noapic", parse_noapic);
213
214/* Will be called in mpparse/acpi/sfi codes for saving IRQ info */
215void mp_save_irq(struct mpc_intsrc *m)
216{
217 int i;
218
219 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
220 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
221 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
222 m->srcbusirq, m->dstapic, m->dstirq);
223
224 for (i = 0; i < mp_irq_entries; i++) {
225 if (!memcmp(&mp_irqs[i], m, sizeof(*m)))
226 return;
227 }
228
229 memcpy(&mp_irqs[mp_irq_entries], m, sizeof(*m));
230 if (++mp_irq_entries == MAX_IRQ_SOURCES)
231 panic("Max # of irq sources exceeded!!\n");
232}
233
234static void alloc_ioapic_saved_registers(int idx)
235{
236 size_t size;
237
238 if (ioapics[idx].saved_registers)
239 return;
240
241 size = sizeof(struct IO_APIC_route_entry) * ioapics[idx].nr_registers;
242 ioapics[idx].saved_registers = kzalloc(size, GFP_KERNEL);
243 if (!ioapics[idx].saved_registers)
244 pr_err("IOAPIC %d: suspend/resume impossible!\n", idx);
245}
246
247static void free_ioapic_saved_registers(int idx)
248{
249 kfree(ioapics[idx].saved_registers);
250 ioapics[idx].saved_registers = NULL;
251}
252
253int __init arch_early_ioapic_init(void)
254{
255 int i;
256
257 if (!nr_legacy_irqs())
258 io_apic_irqs = ~0UL;
259
260 for_each_ioapic(i)
261 alloc_ioapic_saved_registers(i);
262
263 return 0;
264}
265
266struct io_apic {
267 unsigned int index;
268 unsigned int unused[3];
269 unsigned int data;
270 unsigned int unused2[11];
271 unsigned int eoi;
272};
273
274static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
275{
276 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
277 + (mpc_ioapic_addr(idx) & ~PAGE_MASK);
278}
279
280static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
281{
282 struct io_apic __iomem *io_apic = io_apic_base(apic);
283 writel(vector, &io_apic->eoi);
284}
285
286unsigned int native_io_apic_read(unsigned int apic, unsigned int reg)
287{
288 struct io_apic __iomem *io_apic = io_apic_base(apic);
289 writel(reg, &io_apic->index);
290 return readl(&io_apic->data);
291}
292
293static void io_apic_write(unsigned int apic, unsigned int reg,
294 unsigned int value)
295{
296 struct io_apic __iomem *io_apic = io_apic_base(apic);
297
298 writel(reg, &io_apic->index);
299 writel(value, &io_apic->data);
300}
301
302union entry_union {
303 struct { u32 w1, w2; };
304 struct IO_APIC_route_entry entry;
305};
306
307static struct IO_APIC_route_entry __ioapic_read_entry(int apic, int pin)
308{
309 union entry_union eu;
310
311 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
312 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
313
314 return eu.entry;
315}
316
317static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
318{
319 union entry_union eu;
320 unsigned long flags;
321
322 raw_spin_lock_irqsave(&ioapic_lock, flags);
323 eu.entry = __ioapic_read_entry(apic, pin);
324 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
325
326 return eu.entry;
327}
328
329/*
330 * When we write a new IO APIC routing entry, we need to write the high
331 * word first! If the mask bit in the low word is clear, we will enable
332 * the interrupt, and we need to make sure the entry is fully populated
333 * before that happens.
334 */
335static void __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
336{
337 union entry_union eu = {{0, 0}};
338
339 eu.entry = e;
340 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
341 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
342}
343
344static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
345{
346 unsigned long flags;
347
348 raw_spin_lock_irqsave(&ioapic_lock, flags);
349 __ioapic_write_entry(apic, pin, e);
350 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
351}
352
353/*
354 * When we mask an IO APIC routing entry, we need to write the low
355 * word first, in order to set the mask bit before we change the
356 * high bits!
357 */
358static void ioapic_mask_entry(int apic, int pin)
359{
360 unsigned long flags;
361 union entry_union eu = { .entry.mask = IOAPIC_MASKED };
362
363 raw_spin_lock_irqsave(&ioapic_lock, flags);
364 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
365 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
366 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
367}
368
369/*
370 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
371 * shared ISA-space IRQs, so we have to support them. We are super
372 * fast in the common case, and fast for shared ISA-space IRQs.
373 */
374static int __add_pin_to_irq_node(struct mp_chip_data *data,
375 int node, int apic, int pin)
376{
377 struct irq_pin_list *entry;
378
379 /* don't allow duplicates */
380 for_each_irq_pin(entry, data->irq_2_pin)
381 if (entry->apic == apic && entry->pin == pin)
382 return 0;
383
384 entry = kzalloc_node(sizeof(struct irq_pin_list), GFP_ATOMIC, node);
385 if (!entry) {
386 pr_err("can not alloc irq_pin_list (%d,%d,%d)\n",
387 node, apic, pin);
388 return -ENOMEM;
389 }
390 entry->apic = apic;
391 entry->pin = pin;
392 list_add_tail(&entry->list, &data->irq_2_pin);
393
394 return 0;
395}
396
397static void __remove_pin_from_irq(struct mp_chip_data *data, int apic, int pin)
398{
399 struct irq_pin_list *tmp, *entry;
400
401 list_for_each_entry_safe(entry, tmp, &data->irq_2_pin, list)
402 if (entry->apic == apic && entry->pin == pin) {
403 list_del(&entry->list);
404 kfree(entry);
405 return;
406 }
407}
408
409static void add_pin_to_irq_node(struct mp_chip_data *data,
410 int node, int apic, int pin)
411{
412 if (__add_pin_to_irq_node(data, node, apic, pin))
413 panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
414}
415
416/*
417 * Reroute an IRQ to a different pin.
418 */
419static void __init replace_pin_at_irq_node(struct mp_chip_data *data, int node,
420 int oldapic, int oldpin,
421 int newapic, int newpin)
422{
423 struct irq_pin_list *entry;
424
425 for_each_irq_pin(entry, data->irq_2_pin) {
426 if (entry->apic == oldapic && entry->pin == oldpin) {
427 entry->apic = newapic;
428 entry->pin = newpin;
429 /* every one is different, right? */
430 return;
431 }
432 }
433
434 /* old apic/pin didn't exist, so just add new ones */
435 add_pin_to_irq_node(data, node, newapic, newpin);
436}
437
438static void io_apic_modify_irq(struct mp_chip_data *data,
439 int mask_and, int mask_or,
440 void (*final)(struct irq_pin_list *entry))
441{
442 union entry_union eu;
443 struct irq_pin_list *entry;
444
445 eu.entry = data->entry;
446 eu.w1 &= mask_and;
447 eu.w1 |= mask_or;
448 data->entry = eu.entry;
449
450 for_each_irq_pin(entry, data->irq_2_pin) {
451 io_apic_write(entry->apic, 0x10 + 2 * entry->pin, eu.w1);
452 if (final)
453 final(entry);
454 }
455}
456
457static void io_apic_sync(struct irq_pin_list *entry)
458{
459 /*
460 * Synchronize the IO-APIC and the CPU by doing
461 * a dummy read from the IO-APIC
462 */
463 struct io_apic __iomem *io_apic;
464
465 io_apic = io_apic_base(entry->apic);
466 readl(&io_apic->data);
467}
468
469static void mask_ioapic_irq(struct irq_data *irq_data)
470{
471 struct mp_chip_data *data = irq_data->chip_data;
472 unsigned long flags;
473
474 raw_spin_lock_irqsave(&ioapic_lock, flags);
475 io_apic_modify_irq(data, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
476 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
477}
478
479static void __unmask_ioapic(struct mp_chip_data *data)
480{
481 io_apic_modify_irq(data, ~IO_APIC_REDIR_MASKED, 0, NULL);
482}
483
484static void unmask_ioapic_irq(struct irq_data *irq_data)
485{
486 struct mp_chip_data *data = irq_data->chip_data;
487 unsigned long flags;
488
489 raw_spin_lock_irqsave(&ioapic_lock, flags);
490 __unmask_ioapic(data);
491 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
492}
493
494/*
495 * IO-APIC versions below 0x20 don't support EOI register.
496 * For the record, here is the information about various versions:
497 * 0Xh 82489DX
498 * 1Xh I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
499 * 2Xh I/O(x)APIC which is PCI 2.2 Compliant
500 * 30h-FFh Reserved
501 *
502 * Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
503 * version as 0x2. This is an error with documentation and these ICH chips
504 * use io-apic's of version 0x20.
505 *
506 * For IO-APIC's with EOI register, we use that to do an explicit EOI.
507 * Otherwise, we simulate the EOI message manually by changing the trigger
508 * mode to edge and then back to level, with RTE being masked during this.
509 */
510static void __eoi_ioapic_pin(int apic, int pin, int vector)
511{
512 if (mpc_ioapic_ver(apic) >= 0x20) {
513 io_apic_eoi(apic, vector);
514 } else {
515 struct IO_APIC_route_entry entry, entry1;
516
517 entry = entry1 = __ioapic_read_entry(apic, pin);
518
519 /*
520 * Mask the entry and change the trigger mode to edge.
521 */
522 entry1.mask = IOAPIC_MASKED;
523 entry1.trigger = IOAPIC_EDGE;
524
525 __ioapic_write_entry(apic, pin, entry1);
526
527 /*
528 * Restore the previous level triggered entry.
529 */
530 __ioapic_write_entry(apic, pin, entry);
531 }
532}
533
534static void eoi_ioapic_pin(int vector, struct mp_chip_data *data)
535{
536 unsigned long flags;
537 struct irq_pin_list *entry;
538
539 raw_spin_lock_irqsave(&ioapic_lock, flags);
540 for_each_irq_pin(entry, data->irq_2_pin)
541 __eoi_ioapic_pin(entry->apic, entry->pin, vector);
542 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
543}
544
545static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
546{
547 struct IO_APIC_route_entry entry;
548
549 /* Check delivery_mode to be sure we're not clearing an SMI pin */
550 entry = ioapic_read_entry(apic, pin);
551 if (entry.delivery_mode == dest_SMI)
552 return;
553
554 /*
555 * Make sure the entry is masked and re-read the contents to check
556 * if it is a level triggered pin and if the remote-IRR is set.
557 */
558 if (entry.mask == IOAPIC_UNMASKED) {
559 entry.mask = IOAPIC_MASKED;
560 ioapic_write_entry(apic, pin, entry);
561 entry = ioapic_read_entry(apic, pin);
562 }
563
564 if (entry.irr) {
565 unsigned long flags;
566
567 /*
568 * Make sure the trigger mode is set to level. Explicit EOI
569 * doesn't clear the remote-IRR if the trigger mode is not
570 * set to level.
571 */
572 if (entry.trigger == IOAPIC_EDGE) {
573 entry.trigger = IOAPIC_LEVEL;
574 ioapic_write_entry(apic, pin, entry);
575 }
576 raw_spin_lock_irqsave(&ioapic_lock, flags);
577 __eoi_ioapic_pin(apic, pin, entry.vector);
578 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
579 }
580
581 /*
582 * Clear the rest of the bits in the IO-APIC RTE except for the mask
583 * bit.
584 */
585 ioapic_mask_entry(apic, pin);
586 entry = ioapic_read_entry(apic, pin);
587 if (entry.irr)
588 pr_err("Unable to reset IRR for apic: %d, pin :%d\n",
589 mpc_ioapic_id(apic), pin);
590}
591
592void clear_IO_APIC (void)
593{
594 int apic, pin;
595
596 for_each_ioapic_pin(apic, pin)
597 clear_IO_APIC_pin(apic, pin);
598}
599
600#ifdef CONFIG_X86_32
601/*
602 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
603 * specific CPU-side IRQs.
604 */
605
606#define MAX_PIRQS 8
607static int pirq_entries[MAX_PIRQS] = {
608 [0 ... MAX_PIRQS - 1] = -1
609};
610
611static int __init ioapic_pirq_setup(char *str)
612{
613 int i, max;
614 int ints[MAX_PIRQS+1];
615
616 get_options(str, ARRAY_SIZE(ints), ints);
617
618 apic_printk(APIC_VERBOSE, KERN_INFO
619 "PIRQ redirection, working around broken MP-BIOS.\n");
620 max = MAX_PIRQS;
621 if (ints[0] < MAX_PIRQS)
622 max = ints[0];
623
624 for (i = 0; i < max; i++) {
625 apic_printk(APIC_VERBOSE, KERN_DEBUG
626 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
627 /*
628 * PIRQs are mapped upside down, usually.
629 */
630 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
631 }
632 return 1;
633}
634
635__setup("pirq=", ioapic_pirq_setup);
636#endif /* CONFIG_X86_32 */
637
638/*
639 * Saves all the IO-APIC RTE's
640 */
641int save_ioapic_entries(void)
642{
643 int apic, pin;
644 int err = 0;
645
646 for_each_ioapic(apic) {
647 if (!ioapics[apic].saved_registers) {
648 err = -ENOMEM;
649 continue;
650 }
651
652 for_each_pin(apic, pin)
653 ioapics[apic].saved_registers[pin] =
654 ioapic_read_entry(apic, pin);
655 }
656
657 return err;
658}
659
660/*
661 * Mask all IO APIC entries.
662 */
663void mask_ioapic_entries(void)
664{
665 int apic, pin;
666
667 for_each_ioapic(apic) {
668 if (!ioapics[apic].saved_registers)
669 continue;
670
671 for_each_pin(apic, pin) {
672 struct IO_APIC_route_entry entry;
673
674 entry = ioapics[apic].saved_registers[pin];
675 if (entry.mask == IOAPIC_UNMASKED) {
676 entry.mask = IOAPIC_MASKED;
677 ioapic_write_entry(apic, pin, entry);
678 }
679 }
680 }
681}
682
683/*
684 * Restore IO APIC entries which was saved in the ioapic structure.
685 */
686int restore_ioapic_entries(void)
687{
688 int apic, pin;
689
690 for_each_ioapic(apic) {
691 if (!ioapics[apic].saved_registers)
692 continue;
693
694 for_each_pin(apic, pin)
695 ioapic_write_entry(apic, pin,
696 ioapics[apic].saved_registers[pin]);
697 }
698 return 0;
699}
700
701/*
702 * Find the IRQ entry number of a certain pin.
703 */
704static int find_irq_entry(int ioapic_idx, int pin, int type)
705{
706 int i;
707
708 for (i = 0; i < mp_irq_entries; i++)
709 if (mp_irqs[i].irqtype == type &&
710 (mp_irqs[i].dstapic == mpc_ioapic_id(ioapic_idx) ||
711 mp_irqs[i].dstapic == MP_APIC_ALL) &&
712 mp_irqs[i].dstirq == pin)
713 return i;
714
715 return -1;
716}
717
718/*
719 * Find the pin to which IRQ[irq] (ISA) is connected
720 */
721static int __init find_isa_irq_pin(int irq, int type)
722{
723 int i;
724
725 for (i = 0; i < mp_irq_entries; i++) {
726 int lbus = mp_irqs[i].srcbus;
727
728 if (test_bit(lbus, mp_bus_not_pci) &&
729 (mp_irqs[i].irqtype == type) &&
730 (mp_irqs[i].srcbusirq == irq))
731
732 return mp_irqs[i].dstirq;
733 }
734 return -1;
735}
736
737static int __init find_isa_irq_apic(int irq, int type)
738{
739 int i;
740
741 for (i = 0; i < mp_irq_entries; i++) {
742 int lbus = mp_irqs[i].srcbus;
743
744 if (test_bit(lbus, mp_bus_not_pci) &&
745 (mp_irqs[i].irqtype == type) &&
746 (mp_irqs[i].srcbusirq == irq))
747 break;
748 }
749
750 if (i < mp_irq_entries) {
751 int ioapic_idx;
752
753 for_each_ioapic(ioapic_idx)
754 if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic)
755 return ioapic_idx;
756 }
757
758 return -1;
759}
760
761#ifdef CONFIG_EISA
762/*
763 * EISA Edge/Level control register, ELCR
764 */
765static int EISA_ELCR(unsigned int irq)
766{
767 if (irq < nr_legacy_irqs()) {
768 unsigned int port = 0x4d0 + (irq >> 3);
769 return (inb(port) >> (irq & 7)) & 1;
770 }
771 apic_printk(APIC_VERBOSE, KERN_INFO
772 "Broken MPtable reports ISA irq %d\n", irq);
773 return 0;
774}
775
776#endif
777
778/* ISA interrupts are always active high edge triggered,
779 * when listed as conforming in the MP table. */
780
781#define default_ISA_trigger(idx) (IOAPIC_EDGE)
782#define default_ISA_polarity(idx) (IOAPIC_POL_HIGH)
783
784/* EISA interrupts are always polarity zero and can be edge or level
785 * trigger depending on the ELCR value. If an interrupt is listed as
786 * EISA conforming in the MP table, that means its trigger type must
787 * be read in from the ELCR */
788
789#define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
790#define default_EISA_polarity(idx) default_ISA_polarity(idx)
791
792/* PCI interrupts are always active low level triggered,
793 * when listed as conforming in the MP table. */
794
795#define default_PCI_trigger(idx) (IOAPIC_LEVEL)
796#define default_PCI_polarity(idx) (IOAPIC_POL_LOW)
797
798static int irq_polarity(int idx)
799{
800 int bus = mp_irqs[idx].srcbus;
801
802 /*
803 * Determine IRQ line polarity (high active or low active):
804 */
805 switch (mp_irqs[idx].irqflag & MP_IRQPOL_MASK) {
806 case MP_IRQPOL_DEFAULT:
807 /* conforms to spec, ie. bus-type dependent polarity */
808 if (test_bit(bus, mp_bus_not_pci))
809 return default_ISA_polarity(idx);
810 else
811 return default_PCI_polarity(idx);
812 case MP_IRQPOL_ACTIVE_HIGH:
813 return IOAPIC_POL_HIGH;
814 case MP_IRQPOL_RESERVED:
815 pr_warn("IOAPIC: Invalid polarity: 2, defaulting to low\n");
816 /* fall through */
817 case MP_IRQPOL_ACTIVE_LOW:
818 default: /* Pointless default required due to do gcc stupidity */
819 return IOAPIC_POL_LOW;
820 }
821}
822
823#ifdef CONFIG_EISA
824static int eisa_irq_trigger(int idx, int bus, int trigger)
825{
826 switch (mp_bus_id_to_type[bus]) {
827 case MP_BUS_PCI:
828 case MP_BUS_ISA:
829 return trigger;
830 case MP_BUS_EISA:
831 return default_EISA_trigger(idx);
832 }
833 pr_warn("IOAPIC: Invalid srcbus: %d defaulting to level\n", bus);
834 return IOAPIC_LEVEL;
835}
836#else
837static inline int eisa_irq_trigger(int idx, int bus, int trigger)
838{
839 return trigger;
840}
841#endif
842
843static int irq_trigger(int idx)
844{
845 int bus = mp_irqs[idx].srcbus;
846 int trigger;
847
848 /*
849 * Determine IRQ trigger mode (edge or level sensitive):
850 */
851 switch (mp_irqs[idx].irqflag & MP_IRQTRIG_MASK) {
852 case MP_IRQTRIG_DEFAULT:
853 /* conforms to spec, ie. bus-type dependent trigger mode */
854 if (test_bit(bus, mp_bus_not_pci))
855 trigger = default_ISA_trigger(idx);
856 else
857 trigger = default_PCI_trigger(idx);
858 /* Take EISA into account */
859 return eisa_irq_trigger(idx, bus, trigger);
860 case MP_IRQTRIG_EDGE:
861 return IOAPIC_EDGE;
862 case MP_IRQTRIG_RESERVED:
863 pr_warn("IOAPIC: Invalid trigger mode 2 defaulting to level\n");
864 /* fall through */
865 case MP_IRQTRIG_LEVEL:
866 default: /* Pointless default required due to do gcc stupidity */
867 return IOAPIC_LEVEL;
868 }
869}
870
871void ioapic_set_alloc_attr(struct irq_alloc_info *info, int node,
872 int trigger, int polarity)
873{
874 init_irq_alloc_info(info, NULL);
875 info->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
876 info->ioapic_node = node;
877 info->ioapic_trigger = trigger;
878 info->ioapic_polarity = polarity;
879 info->ioapic_valid = 1;
880}
881
882#ifndef CONFIG_ACPI
883int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
884#endif
885
886static void ioapic_copy_alloc_attr(struct irq_alloc_info *dst,
887 struct irq_alloc_info *src,
888 u32 gsi, int ioapic_idx, int pin)
889{
890 int trigger, polarity;
891
892 copy_irq_alloc_info(dst, src);
893 dst->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
894 dst->ioapic_id = mpc_ioapic_id(ioapic_idx);
895 dst->ioapic_pin = pin;
896 dst->ioapic_valid = 1;
897 if (src && src->ioapic_valid) {
898 dst->ioapic_node = src->ioapic_node;
899 dst->ioapic_trigger = src->ioapic_trigger;
900 dst->ioapic_polarity = src->ioapic_polarity;
901 } else {
902 dst->ioapic_node = NUMA_NO_NODE;
903 if (acpi_get_override_irq(gsi, &trigger, &polarity) >= 0) {
904 dst->ioapic_trigger = trigger;
905 dst->ioapic_polarity = polarity;
906 } else {
907 /*
908 * PCI interrupts are always active low level
909 * triggered.
910 */
911 dst->ioapic_trigger = IOAPIC_LEVEL;
912 dst->ioapic_polarity = IOAPIC_POL_LOW;
913 }
914 }
915}
916
917static int ioapic_alloc_attr_node(struct irq_alloc_info *info)
918{
919 return (info && info->ioapic_valid) ? info->ioapic_node : NUMA_NO_NODE;
920}
921
922static void mp_register_handler(unsigned int irq, unsigned long trigger)
923{
924 irq_flow_handler_t hdl;
925 bool fasteoi;
926
927 if (trigger) {
928 irq_set_status_flags(irq, IRQ_LEVEL);
929 fasteoi = true;
930 } else {
931 irq_clear_status_flags(irq, IRQ_LEVEL);
932 fasteoi = false;
933 }
934
935 hdl = fasteoi ? handle_fasteoi_irq : handle_edge_irq;
936 __irq_set_handler(irq, hdl, 0, fasteoi ? "fasteoi" : "edge");
937}
938
939static bool mp_check_pin_attr(int irq, struct irq_alloc_info *info)
940{
941 struct mp_chip_data *data = irq_get_chip_data(irq);
942
943 /*
944 * setup_IO_APIC_irqs() programs all legacy IRQs with default trigger
945 * and polarity attirbutes. So allow the first user to reprogram the
946 * pin with real trigger and polarity attributes.
947 */
948 if (irq < nr_legacy_irqs() && data->count == 1) {
949 if (info->ioapic_trigger != data->trigger)
950 mp_register_handler(irq, info->ioapic_trigger);
951 data->entry.trigger = data->trigger = info->ioapic_trigger;
952 data->entry.polarity = data->polarity = info->ioapic_polarity;
953 }
954
955 return data->trigger == info->ioapic_trigger &&
956 data->polarity == info->ioapic_polarity;
957}
958
959static int alloc_irq_from_domain(struct irq_domain *domain, int ioapic, u32 gsi,
960 struct irq_alloc_info *info)
961{
962 bool legacy = false;
963 int irq = -1;
964 int type = ioapics[ioapic].irqdomain_cfg.type;
965
966 switch (type) {
967 case IOAPIC_DOMAIN_LEGACY:
968 /*
969 * Dynamically allocate IRQ number for non-ISA IRQs in the first
970 * 16 GSIs on some weird platforms.
971 */
972 if (!ioapic_initialized || gsi >= nr_legacy_irqs())
973 irq = gsi;
974 legacy = mp_is_legacy_irq(irq);
975 break;
976 case IOAPIC_DOMAIN_STRICT:
977 irq = gsi;
978 break;
979 case IOAPIC_DOMAIN_DYNAMIC:
980 break;
981 default:
982 WARN(1, "ioapic: unknown irqdomain type %d\n", type);
983 return -1;
984 }
985
986 return __irq_domain_alloc_irqs(domain, irq, 1,
987 ioapic_alloc_attr_node(info),
988 info, legacy, NULL);
989}
990
991/*
992 * Need special handling for ISA IRQs because there may be multiple IOAPIC pins
993 * sharing the same ISA IRQ number and irqdomain only supports 1:1 mapping
994 * between IOAPIC pin and IRQ number. A typical IOAPIC has 24 pins, pin 0-15 are
995 * used for legacy IRQs and pin 16-23 are used for PCI IRQs (PIRQ A-H).
996 * When ACPI is disabled, only legacy IRQ numbers (IRQ0-15) are available, and
997 * some BIOSes may use MP Interrupt Source records to override IRQ numbers for
998 * PIRQs instead of reprogramming the interrupt routing logic. Thus there may be
999 * multiple pins sharing the same legacy IRQ number when ACPI is disabled.
1000 */
1001static int alloc_isa_irq_from_domain(struct irq_domain *domain,
1002 int irq, int ioapic, int pin,
1003 struct irq_alloc_info *info)
1004{
1005 struct mp_chip_data *data;
1006 struct irq_data *irq_data = irq_get_irq_data(irq);
1007 int node = ioapic_alloc_attr_node(info);
1008
1009 /*
1010 * Legacy ISA IRQ has already been allocated, just add pin to
1011 * the pin list assoicated with this IRQ and program the IOAPIC
1012 * entry. The IOAPIC entry
1013 */
1014 if (irq_data && irq_data->parent_data) {
1015 if (!mp_check_pin_attr(irq, info))
1016 return -EBUSY;
1017 if (__add_pin_to_irq_node(irq_data->chip_data, node, ioapic,
1018 info->ioapic_pin))
1019 return -ENOMEM;
1020 } else {
1021 info->flags |= X86_IRQ_ALLOC_LEGACY;
1022 irq = __irq_domain_alloc_irqs(domain, irq, 1, node, info, true,
1023 NULL);
1024 if (irq >= 0) {
1025 irq_data = irq_domain_get_irq_data(domain, irq);
1026 data = irq_data->chip_data;
1027 data->isa_irq = true;
1028 }
1029 }
1030
1031 return irq;
1032}
1033
1034static int mp_map_pin_to_irq(u32 gsi, int idx, int ioapic, int pin,
1035 unsigned int flags, struct irq_alloc_info *info)
1036{
1037 int irq;
1038 bool legacy = false;
1039 struct irq_alloc_info tmp;
1040 struct mp_chip_data *data;
1041 struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
1042
1043 if (!domain)
1044 return -ENOSYS;
1045
1046 if (idx >= 0 && test_bit(mp_irqs[idx].srcbus, mp_bus_not_pci)) {
1047 irq = mp_irqs[idx].srcbusirq;
1048 legacy = mp_is_legacy_irq(irq);
1049 }
1050
1051 mutex_lock(&ioapic_mutex);
1052 if (!(flags & IOAPIC_MAP_ALLOC)) {
1053 if (!legacy) {
1054 irq = irq_find_mapping(domain, pin);
1055 if (irq == 0)
1056 irq = -ENOENT;
1057 }
1058 } else {
1059 ioapic_copy_alloc_attr(&tmp, info, gsi, ioapic, pin);
1060 if (legacy)
1061 irq = alloc_isa_irq_from_domain(domain, irq,
1062 ioapic, pin, &tmp);
1063 else if ((irq = irq_find_mapping(domain, pin)) == 0)
1064 irq = alloc_irq_from_domain(domain, ioapic, gsi, &tmp);
1065 else if (!mp_check_pin_attr(irq, &tmp))
1066 irq = -EBUSY;
1067 if (irq >= 0) {
1068 data = irq_get_chip_data(irq);
1069 data->count++;
1070 }
1071 }
1072 mutex_unlock(&ioapic_mutex);
1073
1074 return irq;
1075}
1076
1077static int pin_2_irq(int idx, int ioapic, int pin, unsigned int flags)
1078{
1079 u32 gsi = mp_pin_to_gsi(ioapic, pin);
1080
1081 /*
1082 * Debugging check, we are in big trouble if this message pops up!
1083 */
1084 if (mp_irqs[idx].dstirq != pin)
1085 pr_err("broken BIOS or MPTABLE parser, ayiee!!\n");
1086
1087#ifdef CONFIG_X86_32
1088 /*
1089 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1090 */
1091 if ((pin >= 16) && (pin <= 23)) {
1092 if (pirq_entries[pin-16] != -1) {
1093 if (!pirq_entries[pin-16]) {
1094 apic_printk(APIC_VERBOSE, KERN_DEBUG
1095 "disabling PIRQ%d\n", pin-16);
1096 } else {
1097 int irq = pirq_entries[pin-16];
1098 apic_printk(APIC_VERBOSE, KERN_DEBUG
1099 "using PIRQ%d -> IRQ %d\n",
1100 pin-16, irq);
1101 return irq;
1102 }
1103 }
1104 }
1105#endif
1106
1107 return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, NULL);
1108}
1109
1110int mp_map_gsi_to_irq(u32 gsi, unsigned int flags, struct irq_alloc_info *info)
1111{
1112 int ioapic, pin, idx;
1113
1114 ioapic = mp_find_ioapic(gsi);
1115 if (ioapic < 0)
1116 return -ENODEV;
1117
1118 pin = mp_find_ioapic_pin(ioapic, gsi);
1119 idx = find_irq_entry(ioapic, pin, mp_INT);
1120 if ((flags & IOAPIC_MAP_CHECK) && idx < 0)
1121 return -ENODEV;
1122
1123 return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, info);
1124}
1125
1126void mp_unmap_irq(int irq)
1127{
1128 struct irq_data *irq_data = irq_get_irq_data(irq);
1129 struct mp_chip_data *data;
1130
1131 if (!irq_data || !irq_data->domain)
1132 return;
1133
1134 data = irq_data->chip_data;
1135 if (!data || data->isa_irq)
1136 return;
1137
1138 mutex_lock(&ioapic_mutex);
1139 if (--data->count == 0)
1140 irq_domain_free_irqs(irq, 1);
1141 mutex_unlock(&ioapic_mutex);
1142}
1143
1144/*
1145 * Find a specific PCI IRQ entry.
1146 * Not an __init, possibly needed by modules
1147 */
1148int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
1149{
1150 int irq, i, best_ioapic = -1, best_idx = -1;
1151
1152 apic_printk(APIC_DEBUG,
1153 "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
1154 bus, slot, pin);
1155 if (test_bit(bus, mp_bus_not_pci)) {
1156 apic_printk(APIC_VERBOSE,
1157 "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
1158 return -1;
1159 }
1160
1161 for (i = 0; i < mp_irq_entries; i++) {
1162 int lbus = mp_irqs[i].srcbus;
1163 int ioapic_idx, found = 0;
1164
1165 if (bus != lbus || mp_irqs[i].irqtype != mp_INT ||
1166 slot != ((mp_irqs[i].srcbusirq >> 2) & 0x1f))
1167 continue;
1168
1169 for_each_ioapic(ioapic_idx)
1170 if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic ||
1171 mp_irqs[i].dstapic == MP_APIC_ALL) {
1172 found = 1;
1173 break;
1174 }
1175 if (!found)
1176 continue;
1177
1178 /* Skip ISA IRQs */
1179 irq = pin_2_irq(i, ioapic_idx, mp_irqs[i].dstirq, 0);
1180 if (irq > 0 && !IO_APIC_IRQ(irq))
1181 continue;
1182
1183 if (pin == (mp_irqs[i].srcbusirq & 3)) {
1184 best_idx = i;
1185 best_ioapic = ioapic_idx;
1186 goto out;
1187 }
1188
1189 /*
1190 * Use the first all-but-pin matching entry as a
1191 * best-guess fuzzy result for broken mptables.
1192 */
1193 if (best_idx < 0) {
1194 best_idx = i;
1195 best_ioapic = ioapic_idx;
1196 }
1197 }
1198 if (best_idx < 0)
1199 return -1;
1200
1201out:
1202 return pin_2_irq(best_idx, best_ioapic, mp_irqs[best_idx].dstirq,
1203 IOAPIC_MAP_ALLOC);
1204}
1205EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
1206
1207static struct irq_chip ioapic_chip, ioapic_ir_chip;
1208
1209static void __init setup_IO_APIC_irqs(void)
1210{
1211 unsigned int ioapic, pin;
1212 int idx;
1213
1214 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1215
1216 for_each_ioapic_pin(ioapic, pin) {
1217 idx = find_irq_entry(ioapic, pin, mp_INT);
1218 if (idx < 0)
1219 apic_printk(APIC_VERBOSE,
1220 KERN_DEBUG " apic %d pin %d not connected\n",
1221 mpc_ioapic_id(ioapic), pin);
1222 else
1223 pin_2_irq(idx, ioapic, pin,
1224 ioapic ? 0 : IOAPIC_MAP_ALLOC);
1225 }
1226}
1227
1228void ioapic_zap_locks(void)
1229{
1230 raw_spin_lock_init(&ioapic_lock);
1231}
1232
1233static void io_apic_print_entries(unsigned int apic, unsigned int nr_entries)
1234{
1235 int i;
1236 char buf[256];
1237 struct IO_APIC_route_entry entry;
1238 struct IR_IO_APIC_route_entry *ir_entry = (void *)&entry;
1239
1240 printk(KERN_DEBUG "IOAPIC %d:\n", apic);
1241 for (i = 0; i <= nr_entries; i++) {
1242 entry = ioapic_read_entry(apic, i);
1243 snprintf(buf, sizeof(buf),
1244 " pin%02x, %s, %s, %s, V(%02X), IRR(%1d), S(%1d)",
1245 i,
1246 entry.mask == IOAPIC_MASKED ? "disabled" : "enabled ",
1247 entry.trigger == IOAPIC_LEVEL ? "level" : "edge ",
1248 entry.polarity == IOAPIC_POL_LOW ? "low " : "high",
1249 entry.vector, entry.irr, entry.delivery_status);
1250 if (ir_entry->format)
1251 printk(KERN_DEBUG "%s, remapped, I(%04X), Z(%X)\n",
1252 buf, (ir_entry->index2 << 15) | ir_entry->index,
1253 ir_entry->zero);
1254 else
1255 printk(KERN_DEBUG "%s, %s, D(%02X), M(%1d)\n",
1256 buf,
1257 entry.dest_mode == IOAPIC_DEST_MODE_LOGICAL ?
1258 "logical " : "physical",
1259 entry.dest, entry.delivery_mode);
1260 }
1261}
1262
1263static void __init print_IO_APIC(int ioapic_idx)
1264{
1265 union IO_APIC_reg_00 reg_00;
1266 union IO_APIC_reg_01 reg_01;
1267 union IO_APIC_reg_02 reg_02;
1268 union IO_APIC_reg_03 reg_03;
1269 unsigned long flags;
1270
1271 raw_spin_lock_irqsave(&ioapic_lock, flags);
1272 reg_00.raw = io_apic_read(ioapic_idx, 0);
1273 reg_01.raw = io_apic_read(ioapic_idx, 1);
1274 if (reg_01.bits.version >= 0x10)
1275 reg_02.raw = io_apic_read(ioapic_idx, 2);
1276 if (reg_01.bits.version >= 0x20)
1277 reg_03.raw = io_apic_read(ioapic_idx, 3);
1278 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1279
1280 printk(KERN_DEBUG "IO APIC #%d......\n", mpc_ioapic_id(ioapic_idx));
1281 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1282 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1283 printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
1284 printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
1285
1286 printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
1287 printk(KERN_DEBUG "....... : max redirection entries: %02X\n",
1288 reg_01.bits.entries);
1289
1290 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1291 printk(KERN_DEBUG "....... : IO APIC version: %02X\n",
1292 reg_01.bits.version);
1293
1294 /*
1295 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1296 * but the value of reg_02 is read as the previous read register
1297 * value, so ignore it if reg_02 == reg_01.
1298 */
1299 if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1300 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1301 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1302 }
1303
1304 /*
1305 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1306 * or reg_03, but the value of reg_0[23] is read as the previous read
1307 * register value, so ignore it if reg_03 == reg_0[12].
1308 */
1309 if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1310 reg_03.raw != reg_01.raw) {
1311 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1312 printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
1313 }
1314
1315 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1316 io_apic_print_entries(ioapic_idx, reg_01.bits.entries);
1317}
1318
1319void __init print_IO_APICs(void)
1320{
1321 int ioapic_idx;
1322 unsigned int irq;
1323
1324 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1325 for_each_ioapic(ioapic_idx)
1326 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1327 mpc_ioapic_id(ioapic_idx),
1328 ioapics[ioapic_idx].nr_registers);
1329
1330 /*
1331 * We are a bit conservative about what we expect. We have to
1332 * know about every hardware change ASAP.
1333 */
1334 printk(KERN_INFO "testing the IO APIC.......................\n");
1335
1336 for_each_ioapic(ioapic_idx)
1337 print_IO_APIC(ioapic_idx);
1338
1339 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1340 for_each_active_irq(irq) {
1341 struct irq_pin_list *entry;
1342 struct irq_chip *chip;
1343 struct mp_chip_data *data;
1344
1345 chip = irq_get_chip(irq);
1346 if (chip != &ioapic_chip && chip != &ioapic_ir_chip)
1347 continue;
1348 data = irq_get_chip_data(irq);
1349 if (!data)
1350 continue;
1351 if (list_empty(&data->irq_2_pin))
1352 continue;
1353
1354 printk(KERN_DEBUG "IRQ%d ", irq);
1355 for_each_irq_pin(entry, data->irq_2_pin)
1356 pr_cont("-> %d:%d", entry->apic, entry->pin);
1357 pr_cont("\n");
1358 }
1359
1360 printk(KERN_INFO ".................................... done.\n");
1361}
1362
1363/* Where if anywhere is the i8259 connect in external int mode */
1364static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
1365
1366void __init enable_IO_APIC(void)
1367{
1368 int i8259_apic, i8259_pin;
1369 int apic, pin;
1370
1371 if (skip_ioapic_setup)
1372 nr_ioapics = 0;
1373
1374 if (!nr_legacy_irqs() || !nr_ioapics)
1375 return;
1376
1377 for_each_ioapic_pin(apic, pin) {
1378 /* See if any of the pins is in ExtINT mode */
1379 struct IO_APIC_route_entry entry = ioapic_read_entry(apic, pin);
1380
1381 /* If the interrupt line is enabled and in ExtInt mode
1382 * I have found the pin where the i8259 is connected.
1383 */
1384 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1385 ioapic_i8259.apic = apic;
1386 ioapic_i8259.pin = pin;
1387 goto found_i8259;
1388 }
1389 }
1390 found_i8259:
1391 /* Look to see what if the MP table has reported the ExtINT */
1392 /* If we could not find the appropriate pin by looking at the ioapic
1393 * the i8259 probably is not connected the ioapic but give the
1394 * mptable a chance anyway.
1395 */
1396 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1397 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1398 /* Trust the MP table if nothing is setup in the hardware */
1399 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1400 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1401 ioapic_i8259.pin = i8259_pin;
1402 ioapic_i8259.apic = i8259_apic;
1403 }
1404 /* Complain if the MP table and the hardware disagree */
1405 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1406 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1407 {
1408 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1409 }
1410
1411 /*
1412 * Do not trust the IO-APIC being empty at bootup
1413 */
1414 clear_IO_APIC();
1415}
1416
1417void native_restore_boot_irq_mode(void)
1418{
1419 /*
1420 * If the i8259 is routed through an IOAPIC
1421 * Put that IOAPIC in virtual wire mode
1422 * so legacy interrupts can be delivered.
1423 */
1424 if (ioapic_i8259.pin != -1) {
1425 struct IO_APIC_route_entry entry;
1426
1427 memset(&entry, 0, sizeof(entry));
1428 entry.mask = IOAPIC_UNMASKED;
1429 entry.trigger = IOAPIC_EDGE;
1430 entry.polarity = IOAPIC_POL_HIGH;
1431 entry.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
1432 entry.delivery_mode = dest_ExtINT;
1433 entry.dest = read_apic_id();
1434
1435 /*
1436 * Add it to the IO-APIC irq-routing table:
1437 */
1438 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1439 }
1440
1441 if (boot_cpu_has(X86_FEATURE_APIC) || apic_from_smp_config())
1442 disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1443}
1444
1445void restore_boot_irq_mode(void)
1446{
1447 if (!nr_legacy_irqs())
1448 return;
1449
1450 x86_apic_ops.restore();
1451}
1452
1453#ifdef CONFIG_X86_32
1454/*
1455 * function to set the IO-APIC physical IDs based on the
1456 * values stored in the MPC table.
1457 *
1458 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
1459 */
1460void __init setup_ioapic_ids_from_mpc_nocheck(void)
1461{
1462 union IO_APIC_reg_00 reg_00;
1463 physid_mask_t phys_id_present_map;
1464 int ioapic_idx;
1465 int i;
1466 unsigned char old_id;
1467 unsigned long flags;
1468
1469 /*
1470 * This is broken; anything with a real cpu count has to
1471 * circumvent this idiocy regardless.
1472 */
1473 apic->ioapic_phys_id_map(&phys_cpu_present_map, &phys_id_present_map);
1474
1475 /*
1476 * Set the IOAPIC ID to the value stored in the MPC table.
1477 */
1478 for_each_ioapic(ioapic_idx) {
1479 /* Read the register 0 value */
1480 raw_spin_lock_irqsave(&ioapic_lock, flags);
1481 reg_00.raw = io_apic_read(ioapic_idx, 0);
1482 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1483
1484 old_id = mpc_ioapic_id(ioapic_idx);
1485
1486 if (mpc_ioapic_id(ioapic_idx) >= get_physical_broadcast()) {
1487 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
1488 ioapic_idx, mpc_ioapic_id(ioapic_idx));
1489 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1490 reg_00.bits.ID);
1491 ioapics[ioapic_idx].mp_config.apicid = reg_00.bits.ID;
1492 }
1493
1494 /*
1495 * Sanity check, is the ID really free? Every APIC in a
1496 * system must have a unique ID or we get lots of nice
1497 * 'stuck on smp_invalidate_needed IPI wait' messages.
1498 */
1499 if (apic->check_apicid_used(&phys_id_present_map,
1500 mpc_ioapic_id(ioapic_idx))) {
1501 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
1502 ioapic_idx, mpc_ioapic_id(ioapic_idx));
1503 for (i = 0; i < get_physical_broadcast(); i++)
1504 if (!physid_isset(i, phys_id_present_map))
1505 break;
1506 if (i >= get_physical_broadcast())
1507 panic("Max APIC ID exceeded!\n");
1508 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1509 i);
1510 physid_set(i, phys_id_present_map);
1511 ioapics[ioapic_idx].mp_config.apicid = i;
1512 } else {
1513 physid_mask_t tmp;
1514 apic->apicid_to_cpu_present(mpc_ioapic_id(ioapic_idx),
1515 &tmp);
1516 apic_printk(APIC_VERBOSE, "Setting %d in the "
1517 "phys_id_present_map\n",
1518 mpc_ioapic_id(ioapic_idx));
1519 physids_or(phys_id_present_map, phys_id_present_map, tmp);
1520 }
1521
1522 /*
1523 * We need to adjust the IRQ routing table
1524 * if the ID changed.
1525 */
1526 if (old_id != mpc_ioapic_id(ioapic_idx))
1527 for (i = 0; i < mp_irq_entries; i++)
1528 if (mp_irqs[i].dstapic == old_id)
1529 mp_irqs[i].dstapic
1530 = mpc_ioapic_id(ioapic_idx);
1531
1532 /*
1533 * Update the ID register according to the right value
1534 * from the MPC table if they are different.
1535 */
1536 if (mpc_ioapic_id(ioapic_idx) == reg_00.bits.ID)
1537 continue;
1538
1539 apic_printk(APIC_VERBOSE, KERN_INFO
1540 "...changing IO-APIC physical APIC ID to %d ...",
1541 mpc_ioapic_id(ioapic_idx));
1542
1543 reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
1544 raw_spin_lock_irqsave(&ioapic_lock, flags);
1545 io_apic_write(ioapic_idx, 0, reg_00.raw);
1546 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1547
1548 /*
1549 * Sanity check
1550 */
1551 raw_spin_lock_irqsave(&ioapic_lock, flags);
1552 reg_00.raw = io_apic_read(ioapic_idx, 0);
1553 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1554 if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx))
1555 pr_cont("could not set ID!\n");
1556 else
1557 apic_printk(APIC_VERBOSE, " ok.\n");
1558 }
1559}
1560
1561void __init setup_ioapic_ids_from_mpc(void)
1562{
1563
1564 if (acpi_ioapic)
1565 return;
1566 /*
1567 * Don't check I/O APIC IDs for xAPIC systems. They have
1568 * no meaning without the serial APIC bus.
1569 */
1570 if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
1571 || APIC_XAPIC(boot_cpu_apic_version))
1572 return;
1573 setup_ioapic_ids_from_mpc_nocheck();
1574}
1575#endif
1576
1577int no_timer_check __initdata;
1578
1579static int __init notimercheck(char *s)
1580{
1581 no_timer_check = 1;
1582 return 1;
1583}
1584__setup("no_timer_check", notimercheck);
1585
1586static void __init delay_with_tsc(void)
1587{
1588 unsigned long long start, now;
1589 unsigned long end = jiffies + 4;
1590
1591 start = rdtsc();
1592
1593 /*
1594 * We don't know the TSC frequency yet, but waiting for
1595 * 40000000000/HZ TSC cycles is safe:
1596 * 4 GHz == 10 jiffies
1597 * 1 GHz == 40 jiffies
1598 */
1599 do {
1600 rep_nop();
1601 now = rdtsc();
1602 } while ((now - start) < 40000000000ULL / HZ &&
1603 time_before_eq(jiffies, end));
1604}
1605
1606static void __init delay_without_tsc(void)
1607{
1608 unsigned long end = jiffies + 4;
1609 int band = 1;
1610
1611 /*
1612 * We don't know any frequency yet, but waiting for
1613 * 40940000000/HZ cycles is safe:
1614 * 4 GHz == 10 jiffies
1615 * 1 GHz == 40 jiffies
1616 * 1 << 1 + 1 << 2 +...+ 1 << 11 = 4094
1617 */
1618 do {
1619 __delay(((1U << band++) * 10000000UL) / HZ);
1620 } while (band < 12 && time_before_eq(jiffies, end));
1621}
1622
1623/*
1624 * There is a nasty bug in some older SMP boards, their mptable lies
1625 * about the timer IRQ. We do the following to work around the situation:
1626 *
1627 * - timer IRQ defaults to IO-APIC IRQ
1628 * - if this function detects that timer IRQs are defunct, then we fall
1629 * back to ISA timer IRQs
1630 */
1631static int __init timer_irq_works(void)
1632{
1633 unsigned long t1 = jiffies;
1634 unsigned long flags;
1635
1636 if (no_timer_check)
1637 return 1;
1638
1639 local_save_flags(flags);
1640 local_irq_enable();
1641
1642 if (boot_cpu_has(X86_FEATURE_TSC))
1643 delay_with_tsc();
1644 else
1645 delay_without_tsc();
1646
1647 local_irq_restore(flags);
1648
1649 /*
1650 * Expect a few ticks at least, to be sure some possible
1651 * glue logic does not lock up after one or two first
1652 * ticks in a non-ExtINT mode. Also the local APIC
1653 * might have cached one ExtINT interrupt. Finally, at
1654 * least one tick may be lost due to delays.
1655 */
1656
1657 /* jiffies wrap? */
1658 if (time_after(jiffies, t1 + 4))
1659 return 1;
1660 return 0;
1661}
1662
1663/*
1664 * In the SMP+IOAPIC case it might happen that there are an unspecified
1665 * number of pending IRQ events unhandled. These cases are very rare,
1666 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1667 * better to do it this way as thus we do not have to be aware of
1668 * 'pending' interrupts in the IRQ path, except at this point.
1669 */
1670/*
1671 * Edge triggered needs to resend any interrupt
1672 * that was delayed but this is now handled in the device
1673 * independent code.
1674 */
1675
1676/*
1677 * Starting up a edge-triggered IO-APIC interrupt is
1678 * nasty - we need to make sure that we get the edge.
1679 * If it is already asserted for some reason, we need
1680 * return 1 to indicate that is was pending.
1681 *
1682 * This is not complete - we should be able to fake
1683 * an edge even if it isn't on the 8259A...
1684 */
1685static unsigned int startup_ioapic_irq(struct irq_data *data)
1686{
1687 int was_pending = 0, irq = data->irq;
1688 unsigned long flags;
1689
1690 raw_spin_lock_irqsave(&ioapic_lock, flags);
1691 if (irq < nr_legacy_irqs()) {
1692 legacy_pic->mask(irq);
1693 if (legacy_pic->irq_pending(irq))
1694 was_pending = 1;
1695 }
1696 __unmask_ioapic(data->chip_data);
1697 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1698
1699 return was_pending;
1700}
1701
1702atomic_t irq_mis_count;
1703
1704#ifdef CONFIG_GENERIC_PENDING_IRQ
1705static bool io_apic_level_ack_pending(struct mp_chip_data *data)
1706{
1707 struct irq_pin_list *entry;
1708 unsigned long flags;
1709
1710 raw_spin_lock_irqsave(&ioapic_lock, flags);
1711 for_each_irq_pin(entry, data->irq_2_pin) {
1712 unsigned int reg;
1713 int pin;
1714
1715 pin = entry->pin;
1716 reg = io_apic_read(entry->apic, 0x10 + pin*2);
1717 /* Is the remote IRR bit set? */
1718 if (reg & IO_APIC_REDIR_REMOTE_IRR) {
1719 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1720 return true;
1721 }
1722 }
1723 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1724
1725 return false;
1726}
1727
1728static inline bool ioapic_irqd_mask(struct irq_data *data)
1729{
1730 /* If we are moving the irq we need to mask it */
1731 if (unlikely(irqd_is_setaffinity_pending(data))) {
1732 mask_ioapic_irq(data);
1733 return true;
1734 }
1735 return false;
1736}
1737
1738static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
1739{
1740 if (unlikely(masked)) {
1741 /* Only migrate the irq if the ack has been received.
1742 *
1743 * On rare occasions the broadcast level triggered ack gets
1744 * delayed going to ioapics, and if we reprogram the
1745 * vector while Remote IRR is still set the irq will never
1746 * fire again.
1747 *
1748 * To prevent this scenario we read the Remote IRR bit
1749 * of the ioapic. This has two effects.
1750 * - On any sane system the read of the ioapic will
1751 * flush writes (and acks) going to the ioapic from
1752 * this cpu.
1753 * - We get to see if the ACK has actually been delivered.
1754 *
1755 * Based on failed experiments of reprogramming the
1756 * ioapic entry from outside of irq context starting
1757 * with masking the ioapic entry and then polling until
1758 * Remote IRR was clear before reprogramming the
1759 * ioapic I don't trust the Remote IRR bit to be
1760 * completey accurate.
1761 *
1762 * However there appears to be no other way to plug
1763 * this race, so if the Remote IRR bit is not
1764 * accurate and is causing problems then it is a hardware bug
1765 * and you can go talk to the chipset vendor about it.
1766 */
1767 if (!io_apic_level_ack_pending(data->chip_data))
1768 irq_move_masked_irq(data);
1769 unmask_ioapic_irq(data);
1770 }
1771}
1772#else
1773static inline bool ioapic_irqd_mask(struct irq_data *data)
1774{
1775 return false;
1776}
1777static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
1778{
1779}
1780#endif
1781
1782static void ioapic_ack_level(struct irq_data *irq_data)
1783{
1784 struct irq_cfg *cfg = irqd_cfg(irq_data);
1785 unsigned long v;
1786 bool masked;
1787 int i;
1788
1789 irq_complete_move(cfg);
1790 masked = ioapic_irqd_mask(irq_data);
1791
1792 /*
1793 * It appears there is an erratum which affects at least version 0x11
1794 * of I/O APIC (that's the 82093AA and cores integrated into various
1795 * chipsets). Under certain conditions a level-triggered interrupt is
1796 * erroneously delivered as edge-triggered one but the respective IRR
1797 * bit gets set nevertheless. As a result the I/O unit expects an EOI
1798 * message but it will never arrive and further interrupts are blocked
1799 * from the source. The exact reason is so far unknown, but the
1800 * phenomenon was observed when two consecutive interrupt requests
1801 * from a given source get delivered to the same CPU and the source is
1802 * temporarily disabled in between.
1803 *
1804 * A workaround is to simulate an EOI message manually. We achieve it
1805 * by setting the trigger mode to edge and then to level when the edge
1806 * trigger mode gets detected in the TMR of a local APIC for a
1807 * level-triggered interrupt. We mask the source for the time of the
1808 * operation to prevent an edge-triggered interrupt escaping meanwhile.
1809 * The idea is from Manfred Spraul. --macro
1810 *
1811 * Also in the case when cpu goes offline, fixup_irqs() will forward
1812 * any unhandled interrupt on the offlined cpu to the new cpu
1813 * destination that is handling the corresponding interrupt. This
1814 * interrupt forwarding is done via IPI's. Hence, in this case also
1815 * level-triggered io-apic interrupt will be seen as an edge
1816 * interrupt in the IRR. And we can't rely on the cpu's EOI
1817 * to be broadcasted to the IO-APIC's which will clear the remoteIRR
1818 * corresponding to the level-triggered interrupt. Hence on IO-APIC's
1819 * supporting EOI register, we do an explicit EOI to clear the
1820 * remote IRR and on IO-APIC's which don't have an EOI register,
1821 * we use the above logic (mask+edge followed by unmask+level) from
1822 * Manfred Spraul to clear the remote IRR.
1823 */
1824 i = cfg->vector;
1825 v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
1826
1827 /*
1828 * We must acknowledge the irq before we move it or the acknowledge will
1829 * not propagate properly.
1830 */
1831 ack_APIC_irq();
1832
1833 /*
1834 * Tail end of clearing remote IRR bit (either by delivering the EOI
1835 * message via io-apic EOI register write or simulating it using
1836 * mask+edge followed by unnask+level logic) manually when the
1837 * level triggered interrupt is seen as the edge triggered interrupt
1838 * at the cpu.
1839 */
1840 if (!(v & (1 << (i & 0x1f)))) {
1841 atomic_inc(&irq_mis_count);
1842 eoi_ioapic_pin(cfg->vector, irq_data->chip_data);
1843 }
1844
1845 ioapic_irqd_unmask(irq_data, masked);
1846}
1847
1848static void ioapic_ir_ack_level(struct irq_data *irq_data)
1849{
1850 struct mp_chip_data *data = irq_data->chip_data;
1851
1852 /*
1853 * Intr-remapping uses pin number as the virtual vector
1854 * in the RTE. Actual vector is programmed in
1855 * intr-remapping table entry. Hence for the io-apic
1856 * EOI we use the pin number.
1857 */
1858 apic_ack_irq(irq_data);
1859 eoi_ioapic_pin(data->entry.vector, data);
1860}
1861
1862static void ioapic_configure_entry(struct irq_data *irqd)
1863{
1864 struct mp_chip_data *mpd = irqd->chip_data;
1865 struct irq_cfg *cfg = irqd_cfg(irqd);
1866 struct irq_pin_list *entry;
1867
1868 /*
1869 * Only update when the parent is the vector domain, don't touch it
1870 * if the parent is the remapping domain. Check the installed
1871 * ioapic chip to verify that.
1872 */
1873 if (irqd->chip == &ioapic_chip) {
1874 mpd->entry.dest = cfg->dest_apicid;
1875 mpd->entry.vector = cfg->vector;
1876 }
1877 for_each_irq_pin(entry, mpd->irq_2_pin)
1878 __ioapic_write_entry(entry->apic, entry->pin, mpd->entry);
1879}
1880
1881static int ioapic_set_affinity(struct irq_data *irq_data,
1882 const struct cpumask *mask, bool force)
1883{
1884 struct irq_data *parent = irq_data->parent_data;
1885 unsigned long flags;
1886 int ret;
1887
1888 ret = parent->chip->irq_set_affinity(parent, mask, force);
1889 raw_spin_lock_irqsave(&ioapic_lock, flags);
1890 if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE)
1891 ioapic_configure_entry(irq_data);
1892 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1893
1894 return ret;
1895}
1896
1897/*
1898 * Interrupt shutdown masks the ioapic pin, but the interrupt might already
1899 * be in flight, but not yet serviced by the target CPU. That means
1900 * __synchronize_hardirq() would return and claim that everything is calmed
1901 * down. So free_irq() would proceed and deactivate the interrupt and free
1902 * resources.
1903 *
1904 * Once the target CPU comes around to service it it will find a cleared
1905 * vector and complain. While the spurious interrupt is harmless, the full
1906 * release of resources might prevent the interrupt from being acknowledged
1907 * which keeps the hardware in a weird state.
1908 *
1909 * Verify that the corresponding Remote-IRR bits are clear.
1910 */
1911static int ioapic_irq_get_chip_state(struct irq_data *irqd,
1912 enum irqchip_irq_state which,
1913 bool *state)
1914{
1915 struct mp_chip_data *mcd = irqd->chip_data;
1916 struct IO_APIC_route_entry rentry;
1917 struct irq_pin_list *p;
1918
1919 if (which != IRQCHIP_STATE_ACTIVE)
1920 return -EINVAL;
1921
1922 *state = false;
1923 raw_spin_lock(&ioapic_lock);
1924 for_each_irq_pin(p, mcd->irq_2_pin) {
1925 rentry = __ioapic_read_entry(p->apic, p->pin);
1926 /*
1927 * The remote IRR is only valid in level trigger mode. It's
1928 * meaning is undefined for edge triggered interrupts and
1929 * irrelevant because the IO-APIC treats them as fire and
1930 * forget.
1931 */
1932 if (rentry.irr && rentry.trigger) {
1933 *state = true;
1934 break;
1935 }
1936 }
1937 raw_spin_unlock(&ioapic_lock);
1938 return 0;
1939}
1940
1941static struct irq_chip ioapic_chip __read_mostly = {
1942 .name = "IO-APIC",
1943 .irq_startup = startup_ioapic_irq,
1944 .irq_mask = mask_ioapic_irq,
1945 .irq_unmask = unmask_ioapic_irq,
1946 .irq_ack = irq_chip_ack_parent,
1947 .irq_eoi = ioapic_ack_level,
1948 .irq_set_affinity = ioapic_set_affinity,
1949 .irq_retrigger = irq_chip_retrigger_hierarchy,
1950 .irq_get_irqchip_state = ioapic_irq_get_chip_state,
1951 .flags = IRQCHIP_SKIP_SET_WAKE,
1952};
1953
1954static struct irq_chip ioapic_ir_chip __read_mostly = {
1955 .name = "IR-IO-APIC",
1956 .irq_startup = startup_ioapic_irq,
1957 .irq_mask = mask_ioapic_irq,
1958 .irq_unmask = unmask_ioapic_irq,
1959 .irq_ack = irq_chip_ack_parent,
1960 .irq_eoi = ioapic_ir_ack_level,
1961 .irq_set_affinity = ioapic_set_affinity,
1962 .irq_retrigger = irq_chip_retrigger_hierarchy,
1963 .irq_get_irqchip_state = ioapic_irq_get_chip_state,
1964 .flags = IRQCHIP_SKIP_SET_WAKE,
1965};
1966
1967static inline void init_IO_APIC_traps(void)
1968{
1969 struct irq_cfg *cfg;
1970 unsigned int irq;
1971
1972 for_each_active_irq(irq) {
1973 cfg = irq_cfg(irq);
1974 if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
1975 /*
1976 * Hmm.. We don't have an entry for this,
1977 * so default to an old-fashioned 8259
1978 * interrupt if we can..
1979 */
1980 if (irq < nr_legacy_irqs())
1981 legacy_pic->make_irq(irq);
1982 else
1983 /* Strange. Oh, well.. */
1984 irq_set_chip(irq, &no_irq_chip);
1985 }
1986 }
1987}
1988
1989/*
1990 * The local APIC irq-chip implementation:
1991 */
1992
1993static void mask_lapic_irq(struct irq_data *data)
1994{
1995 unsigned long v;
1996
1997 v = apic_read(APIC_LVT0);
1998 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1999}
2000
2001static void unmask_lapic_irq(struct irq_data *data)
2002{
2003 unsigned long v;
2004
2005 v = apic_read(APIC_LVT0);
2006 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
2007}
2008
2009static void ack_lapic_irq(struct irq_data *data)
2010{
2011 ack_APIC_irq();
2012}
2013
2014static struct irq_chip lapic_chip __read_mostly = {
2015 .name = "local-APIC",
2016 .irq_mask = mask_lapic_irq,
2017 .irq_unmask = unmask_lapic_irq,
2018 .irq_ack = ack_lapic_irq,
2019};
2020
2021static void lapic_register_intr(int irq)
2022{
2023 irq_clear_status_flags(irq, IRQ_LEVEL);
2024 irq_set_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
2025 "edge");
2026}
2027
2028/*
2029 * This looks a bit hackish but it's about the only one way of sending
2030 * a few INTA cycles to 8259As and any associated glue logic. ICR does
2031 * not support the ExtINT mode, unfortunately. We need to send these
2032 * cycles as some i82489DX-based boards have glue logic that keeps the
2033 * 8259A interrupt line asserted until INTA. --macro
2034 */
2035static inline void __init unlock_ExtINT_logic(void)
2036{
2037 int apic, pin, i;
2038 struct IO_APIC_route_entry entry0, entry1;
2039 unsigned char save_control, save_freq_select;
2040
2041 pin = find_isa_irq_pin(8, mp_INT);
2042 if (pin == -1) {
2043 WARN_ON_ONCE(1);
2044 return;
2045 }
2046 apic = find_isa_irq_apic(8, mp_INT);
2047 if (apic == -1) {
2048 WARN_ON_ONCE(1);
2049 return;
2050 }
2051
2052 entry0 = ioapic_read_entry(apic, pin);
2053 clear_IO_APIC_pin(apic, pin);
2054
2055 memset(&entry1, 0, sizeof(entry1));
2056
2057 entry1.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
2058 entry1.mask = IOAPIC_UNMASKED;
2059 entry1.dest = hard_smp_processor_id();
2060 entry1.delivery_mode = dest_ExtINT;
2061 entry1.polarity = entry0.polarity;
2062 entry1.trigger = IOAPIC_EDGE;
2063 entry1.vector = 0;
2064
2065 ioapic_write_entry(apic, pin, entry1);
2066
2067 save_control = CMOS_READ(RTC_CONTROL);
2068 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2069 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2070 RTC_FREQ_SELECT);
2071 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2072
2073 i = 100;
2074 while (i-- > 0) {
2075 mdelay(10);
2076 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2077 i -= 10;
2078 }
2079
2080 CMOS_WRITE(save_control, RTC_CONTROL);
2081 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2082 clear_IO_APIC_pin(apic, pin);
2083
2084 ioapic_write_entry(apic, pin, entry0);
2085}
2086
2087static int disable_timer_pin_1 __initdata;
2088/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2089static int __init disable_timer_pin_setup(char *arg)
2090{
2091 disable_timer_pin_1 = 1;
2092 return 0;
2093}
2094early_param("disable_timer_pin_1", disable_timer_pin_setup);
2095
2096static int mp_alloc_timer_irq(int ioapic, int pin)
2097{
2098 int irq = -1;
2099 struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
2100
2101 if (domain) {
2102 struct irq_alloc_info info;
2103
2104 ioapic_set_alloc_attr(&info, NUMA_NO_NODE, 0, 0);
2105 info.ioapic_id = mpc_ioapic_id(ioapic);
2106 info.ioapic_pin = pin;
2107 mutex_lock(&ioapic_mutex);
2108 irq = alloc_isa_irq_from_domain(domain, 0, ioapic, pin, &info);
2109 mutex_unlock(&ioapic_mutex);
2110 }
2111
2112 return irq;
2113}
2114
2115/*
2116 * This code may look a bit paranoid, but it's supposed to cooperate with
2117 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2118 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2119 * fanatically on his truly buggy board.
2120 *
2121 * FIXME: really need to revamp this for all platforms.
2122 */
2123static inline void __init check_timer(void)
2124{
2125 struct irq_data *irq_data = irq_get_irq_data(0);
2126 struct mp_chip_data *data = irq_data->chip_data;
2127 struct irq_cfg *cfg = irqd_cfg(irq_data);
2128 int node = cpu_to_node(0);
2129 int apic1, pin1, apic2, pin2;
2130 unsigned long flags;
2131 int no_pin1 = 0;
2132
2133 if (!global_clock_event)
2134 return;
2135
2136 local_irq_save(flags);
2137
2138 /*
2139 * get/set the timer IRQ vector:
2140 */
2141 legacy_pic->mask(0);
2142
2143 /*
2144 * As IRQ0 is to be enabled in the 8259A, the virtual
2145 * wire has to be disabled in the local APIC. Also
2146 * timer interrupts need to be acknowledged manually in
2147 * the 8259A for the i82489DX when using the NMI
2148 * watchdog as that APIC treats NMIs as level-triggered.
2149 * The AEOI mode will finish them in the 8259A
2150 * automatically.
2151 */
2152 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2153 legacy_pic->init(1);
2154
2155 pin1 = find_isa_irq_pin(0, mp_INT);
2156 apic1 = find_isa_irq_apic(0, mp_INT);
2157 pin2 = ioapic_i8259.pin;
2158 apic2 = ioapic_i8259.apic;
2159
2160 apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
2161 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2162 cfg->vector, apic1, pin1, apic2, pin2);
2163
2164 /*
2165 * Some BIOS writers are clueless and report the ExtINTA
2166 * I/O APIC input from the cascaded 8259A as the timer
2167 * interrupt input. So just in case, if only one pin
2168 * was found above, try it both directly and through the
2169 * 8259A.
2170 */
2171 if (pin1 == -1) {
2172 panic_if_irq_remap("BIOS bug: timer not connected to IO-APIC");
2173 pin1 = pin2;
2174 apic1 = apic2;
2175 no_pin1 = 1;
2176 } else if (pin2 == -1) {
2177 pin2 = pin1;
2178 apic2 = apic1;
2179 }
2180
2181 if (pin1 != -1) {
2182 /* Ok, does IRQ0 through the IOAPIC work? */
2183 if (no_pin1) {
2184 mp_alloc_timer_irq(apic1, pin1);
2185 } else {
2186 /*
2187 * for edge trigger, it's already unmasked,
2188 * so only need to unmask if it is level-trigger
2189 * do we really have level trigger timer?
2190 */
2191 int idx;
2192 idx = find_irq_entry(apic1, pin1, mp_INT);
2193 if (idx != -1 && irq_trigger(idx))
2194 unmask_ioapic_irq(irq_get_irq_data(0));
2195 }
2196 irq_domain_deactivate_irq(irq_data);
2197 irq_domain_activate_irq(irq_data, false);
2198 if (timer_irq_works()) {
2199 if (disable_timer_pin_1 > 0)
2200 clear_IO_APIC_pin(0, pin1);
2201 goto out;
2202 }
2203 panic_if_irq_remap("timer doesn't work through Interrupt-remapped IO-APIC");
2204 local_irq_disable();
2205 clear_IO_APIC_pin(apic1, pin1);
2206 if (!no_pin1)
2207 apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
2208 "8254 timer not connected to IO-APIC\n");
2209
2210 apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
2211 "(IRQ0) through the 8259A ...\n");
2212 apic_printk(APIC_QUIET, KERN_INFO
2213 "..... (found apic %d pin %d) ...\n", apic2, pin2);
2214 /*
2215 * legacy devices should be connected to IO APIC #0
2216 */
2217 replace_pin_at_irq_node(data, node, apic1, pin1, apic2, pin2);
2218 irq_domain_deactivate_irq(irq_data);
2219 irq_domain_activate_irq(irq_data, false);
2220 legacy_pic->unmask(0);
2221 if (timer_irq_works()) {
2222 apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
2223 goto out;
2224 }
2225 /*
2226 * Cleanup, just in case ...
2227 */
2228 local_irq_disable();
2229 legacy_pic->mask(0);
2230 clear_IO_APIC_pin(apic2, pin2);
2231 apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
2232 }
2233
2234 apic_printk(APIC_QUIET, KERN_INFO
2235 "...trying to set up timer as Virtual Wire IRQ...\n");
2236
2237 lapic_register_intr(0);
2238 apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
2239 legacy_pic->unmask(0);
2240
2241 if (timer_irq_works()) {
2242 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2243 goto out;
2244 }
2245 local_irq_disable();
2246 legacy_pic->mask(0);
2247 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
2248 apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
2249
2250 apic_printk(APIC_QUIET, KERN_INFO
2251 "...trying to set up timer as ExtINT IRQ...\n");
2252
2253 legacy_pic->init(0);
2254 legacy_pic->make_irq(0);
2255 apic_write(APIC_LVT0, APIC_DM_EXTINT);
2256
2257 unlock_ExtINT_logic();
2258
2259 if (timer_irq_works()) {
2260 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2261 goto out;
2262 }
2263 local_irq_disable();
2264 apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
2265 if (apic_is_x2apic_enabled())
2266 apic_printk(APIC_QUIET, KERN_INFO
2267 "Perhaps problem with the pre-enabled x2apic mode\n"
2268 "Try booting with x2apic and interrupt-remapping disabled in the bios.\n");
2269 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
2270 "report. Then try booting with the 'noapic' option.\n");
2271out:
2272 local_irq_restore(flags);
2273}
2274
2275/*
2276 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
2277 * to devices. However there may be an I/O APIC pin available for
2278 * this interrupt regardless. The pin may be left unconnected, but
2279 * typically it will be reused as an ExtINT cascade interrupt for
2280 * the master 8259A. In the MPS case such a pin will normally be
2281 * reported as an ExtINT interrupt in the MP table. With ACPI
2282 * there is no provision for ExtINT interrupts, and in the absence
2283 * of an override it would be treated as an ordinary ISA I/O APIC
2284 * interrupt, that is edge-triggered and unmasked by default. We
2285 * used to do this, but it caused problems on some systems because
2286 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
2287 * the same ExtINT cascade interrupt to drive the local APIC of the
2288 * bootstrap processor. Therefore we refrain from routing IRQ2 to
2289 * the I/O APIC in all cases now. No actual device should request
2290 * it anyway. --macro
2291 */
2292#define PIC_IRQS (1UL << PIC_CASCADE_IR)
2293
2294static int mp_irqdomain_create(int ioapic)
2295{
2296 struct irq_alloc_info info;
2297 struct irq_domain *parent;
2298 int hwirqs = mp_ioapic_pin_count(ioapic);
2299 struct ioapic *ip = &ioapics[ioapic];
2300 struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg;
2301 struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
2302 struct fwnode_handle *fn;
2303 char *name = "IO-APIC";
2304
2305 if (cfg->type == IOAPIC_DOMAIN_INVALID)
2306 return 0;
2307
2308 init_irq_alloc_info(&info, NULL);
2309 info.type = X86_IRQ_ALLOC_TYPE_IOAPIC;
2310 info.ioapic_id = mpc_ioapic_id(ioapic);
2311 parent = irq_remapping_get_ir_irq_domain(&info);
2312 if (!parent)
2313 parent = x86_vector_domain;
2314 else
2315 name = "IO-APIC-IR";
2316
2317 /* Handle device tree enumerated APICs proper */
2318 if (cfg->dev) {
2319 fn = of_node_to_fwnode(cfg->dev);
2320 } else {
2321 fn = irq_domain_alloc_named_id_fwnode(name, ioapic);
2322 if (!fn)
2323 return -ENOMEM;
2324 }
2325
2326 ip->irqdomain = irq_domain_create_linear(fn, hwirqs, cfg->ops,
2327 (void *)(long)ioapic);
2328
2329 /* Release fw handle if it was allocated above */
2330 if (!cfg->dev)
2331 irq_domain_free_fwnode(fn);
2332
2333 if (!ip->irqdomain)
2334 return -ENOMEM;
2335
2336 ip->irqdomain->parent = parent;
2337
2338 if (cfg->type == IOAPIC_DOMAIN_LEGACY ||
2339 cfg->type == IOAPIC_DOMAIN_STRICT)
2340 ioapic_dynirq_base = max(ioapic_dynirq_base,
2341 gsi_cfg->gsi_end + 1);
2342
2343 return 0;
2344}
2345
2346static void ioapic_destroy_irqdomain(int idx)
2347{
2348 if (ioapics[idx].irqdomain) {
2349 irq_domain_remove(ioapics[idx].irqdomain);
2350 ioapics[idx].irqdomain = NULL;
2351 }
2352}
2353
2354void __init setup_IO_APIC(void)
2355{
2356 int ioapic;
2357
2358 if (skip_ioapic_setup || !nr_ioapics)
2359 return;
2360
2361 io_apic_irqs = nr_legacy_irqs() ? ~PIC_IRQS : ~0UL;
2362
2363 apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
2364 for_each_ioapic(ioapic)
2365 BUG_ON(mp_irqdomain_create(ioapic));
2366
2367 /*
2368 * Set up IO-APIC IRQ routing.
2369 */
2370 x86_init.mpparse.setup_ioapic_ids();
2371
2372 sync_Arb_IDs();
2373 setup_IO_APIC_irqs();
2374 init_IO_APIC_traps();
2375 if (nr_legacy_irqs())
2376 check_timer();
2377
2378 ioapic_initialized = 1;
2379}
2380
2381static void resume_ioapic_id(int ioapic_idx)
2382{
2383 unsigned long flags;
2384 union IO_APIC_reg_00 reg_00;
2385
2386 raw_spin_lock_irqsave(&ioapic_lock, flags);
2387 reg_00.raw = io_apic_read(ioapic_idx, 0);
2388 if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx)) {
2389 reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
2390 io_apic_write(ioapic_idx, 0, reg_00.raw);
2391 }
2392 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2393}
2394
2395static void ioapic_resume(void)
2396{
2397 int ioapic_idx;
2398
2399 for_each_ioapic_reverse(ioapic_idx)
2400 resume_ioapic_id(ioapic_idx);
2401
2402 restore_ioapic_entries();
2403}
2404
2405static struct syscore_ops ioapic_syscore_ops = {
2406 .suspend = save_ioapic_entries,
2407 .resume = ioapic_resume,
2408};
2409
2410static int __init ioapic_init_ops(void)
2411{
2412 register_syscore_ops(&ioapic_syscore_ops);
2413
2414 return 0;
2415}
2416
2417device_initcall(ioapic_init_ops);
2418
2419static int io_apic_get_redir_entries(int ioapic)
2420{
2421 union IO_APIC_reg_01 reg_01;
2422 unsigned long flags;
2423
2424 raw_spin_lock_irqsave(&ioapic_lock, flags);
2425 reg_01.raw = io_apic_read(ioapic, 1);
2426 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2427
2428 /* The register returns the maximum index redir index
2429 * supported, which is one less than the total number of redir
2430 * entries.
2431 */
2432 return reg_01.bits.entries + 1;
2433}
2434
2435unsigned int arch_dynirq_lower_bound(unsigned int from)
2436{
2437 /*
2438 * dmar_alloc_hwirq() may be called before setup_IO_APIC(), so use
2439 * gsi_top if ioapic_dynirq_base hasn't been initialized yet.
2440 */
2441 if (!ioapic_initialized)
2442 return gsi_top;
2443 /*
2444 * For DT enabled machines ioapic_dynirq_base is irrelevant and not
2445 * updated. So simply return @from if ioapic_dynirq_base == 0.
2446 */
2447 return ioapic_dynirq_base ? : from;
2448}
2449
2450#ifdef CONFIG_X86_32
2451static int io_apic_get_unique_id(int ioapic, int apic_id)
2452{
2453 union IO_APIC_reg_00 reg_00;
2454 static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
2455 physid_mask_t tmp;
2456 unsigned long flags;
2457 int i = 0;
2458
2459 /*
2460 * The P4 platform supports up to 256 APIC IDs on two separate APIC
2461 * buses (one for LAPICs, one for IOAPICs), where predecessors only
2462 * supports up to 16 on one shared APIC bus.
2463 *
2464 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
2465 * advantage of new APIC bus architecture.
2466 */
2467
2468 if (physids_empty(apic_id_map))
2469 apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);
2470
2471 raw_spin_lock_irqsave(&ioapic_lock, flags);
2472 reg_00.raw = io_apic_read(ioapic, 0);
2473 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2474
2475 if (apic_id >= get_physical_broadcast()) {
2476 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
2477 "%d\n", ioapic, apic_id, reg_00.bits.ID);
2478 apic_id = reg_00.bits.ID;
2479 }
2480
2481 /*
2482 * Every APIC in a system must have a unique ID or we get lots of nice
2483 * 'stuck on smp_invalidate_needed IPI wait' messages.
2484 */
2485 if (apic->check_apicid_used(&apic_id_map, apic_id)) {
2486
2487 for (i = 0; i < get_physical_broadcast(); i++) {
2488 if (!apic->check_apicid_used(&apic_id_map, i))
2489 break;
2490 }
2491
2492 if (i == get_physical_broadcast())
2493 panic("Max apic_id exceeded!\n");
2494
2495 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
2496 "trying %d\n", ioapic, apic_id, i);
2497
2498 apic_id = i;
2499 }
2500
2501 apic->apicid_to_cpu_present(apic_id, &tmp);
2502 physids_or(apic_id_map, apic_id_map, tmp);
2503
2504 if (reg_00.bits.ID != apic_id) {
2505 reg_00.bits.ID = apic_id;
2506
2507 raw_spin_lock_irqsave(&ioapic_lock, flags);
2508 io_apic_write(ioapic, 0, reg_00.raw);
2509 reg_00.raw = io_apic_read(ioapic, 0);
2510 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2511
2512 /* Sanity check */
2513 if (reg_00.bits.ID != apic_id) {
2514 pr_err("IOAPIC[%d]: Unable to change apic_id!\n",
2515 ioapic);
2516 return -1;
2517 }
2518 }
2519
2520 apic_printk(APIC_VERBOSE, KERN_INFO
2521 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
2522
2523 return apic_id;
2524}
2525
2526static u8 io_apic_unique_id(int idx, u8 id)
2527{
2528 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
2529 !APIC_XAPIC(boot_cpu_apic_version))
2530 return io_apic_get_unique_id(idx, id);
2531 else
2532 return id;
2533}
2534#else
2535static u8 io_apic_unique_id(int idx, u8 id)
2536{
2537 union IO_APIC_reg_00 reg_00;
2538 DECLARE_BITMAP(used, 256);
2539 unsigned long flags;
2540 u8 new_id;
2541 int i;
2542
2543 bitmap_zero(used, 256);
2544 for_each_ioapic(i)
2545 __set_bit(mpc_ioapic_id(i), used);
2546
2547 /* Hand out the requested id if available */
2548 if (!test_bit(id, used))
2549 return id;
2550
2551 /*
2552 * Read the current id from the ioapic and keep it if
2553 * available.
2554 */
2555 raw_spin_lock_irqsave(&ioapic_lock, flags);
2556 reg_00.raw = io_apic_read(idx, 0);
2557 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2558 new_id = reg_00.bits.ID;
2559 if (!test_bit(new_id, used)) {
2560 apic_printk(APIC_VERBOSE, KERN_INFO
2561 "IOAPIC[%d]: Using reg apic_id %d instead of %d\n",
2562 idx, new_id, id);
2563 return new_id;
2564 }
2565
2566 /*
2567 * Get the next free id and write it to the ioapic.
2568 */
2569 new_id = find_first_zero_bit(used, 256);
2570 reg_00.bits.ID = new_id;
2571 raw_spin_lock_irqsave(&ioapic_lock, flags);
2572 io_apic_write(idx, 0, reg_00.raw);
2573 reg_00.raw = io_apic_read(idx, 0);
2574 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2575 /* Sanity check */
2576 BUG_ON(reg_00.bits.ID != new_id);
2577
2578 return new_id;
2579}
2580#endif
2581
2582static int io_apic_get_version(int ioapic)
2583{
2584 union IO_APIC_reg_01 reg_01;
2585 unsigned long flags;
2586
2587 raw_spin_lock_irqsave(&ioapic_lock, flags);
2588 reg_01.raw = io_apic_read(ioapic, 1);
2589 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2590
2591 return reg_01.bits.version;
2592}
2593
2594int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
2595{
2596 int ioapic, pin, idx;
2597
2598 if (skip_ioapic_setup)
2599 return -1;
2600
2601 ioapic = mp_find_ioapic(gsi);
2602 if (ioapic < 0)
2603 return -1;
2604
2605 pin = mp_find_ioapic_pin(ioapic, gsi);
2606 if (pin < 0)
2607 return -1;
2608
2609 idx = find_irq_entry(ioapic, pin, mp_INT);
2610 if (idx < 0)
2611 return -1;
2612
2613 *trigger = irq_trigger(idx);
2614 *polarity = irq_polarity(idx);
2615 return 0;
2616}
2617
2618/*
2619 * This function updates target affinity of IOAPIC interrupts to include
2620 * the CPUs which came online during SMP bringup.
2621 */
2622#define IOAPIC_RESOURCE_NAME_SIZE 11
2623
2624static struct resource *ioapic_resources;
2625
2626static struct resource * __init ioapic_setup_resources(void)
2627{
2628 unsigned long n;
2629 struct resource *res;
2630 char *mem;
2631 int i;
2632
2633 if (nr_ioapics == 0)
2634 return NULL;
2635
2636 n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
2637 n *= nr_ioapics;
2638
2639 mem = memblock_alloc(n, SMP_CACHE_BYTES);
2640 if (!mem)
2641 panic("%s: Failed to allocate %lu bytes\n", __func__, n);
2642 res = (void *)mem;
2643
2644 mem += sizeof(struct resource) * nr_ioapics;
2645
2646 for_each_ioapic(i) {
2647 res[i].name = mem;
2648 res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
2649 snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
2650 mem += IOAPIC_RESOURCE_NAME_SIZE;
2651 ioapics[i].iomem_res = &res[i];
2652 }
2653
2654 ioapic_resources = res;
2655
2656 return res;
2657}
2658
2659void __init io_apic_init_mappings(void)
2660{
2661 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
2662 struct resource *ioapic_res;
2663 int i;
2664
2665 ioapic_res = ioapic_setup_resources();
2666 for_each_ioapic(i) {
2667 if (smp_found_config) {
2668 ioapic_phys = mpc_ioapic_addr(i);
2669#ifdef CONFIG_X86_32
2670 if (!ioapic_phys) {
2671 printk(KERN_ERR
2672 "WARNING: bogus zero IO-APIC "
2673 "address found in MPTABLE, "
2674 "disabling IO/APIC support!\n");
2675 smp_found_config = 0;
2676 skip_ioapic_setup = 1;
2677 goto fake_ioapic_page;
2678 }
2679#endif
2680 } else {
2681#ifdef CONFIG_X86_32
2682fake_ioapic_page:
2683#endif
2684 ioapic_phys = (unsigned long)memblock_alloc(PAGE_SIZE,
2685 PAGE_SIZE);
2686 if (!ioapic_phys)
2687 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
2688 __func__, PAGE_SIZE, PAGE_SIZE);
2689 ioapic_phys = __pa(ioapic_phys);
2690 }
2691 set_fixmap_nocache(idx, ioapic_phys);
2692 apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n",
2693 __fix_to_virt(idx) + (ioapic_phys & ~PAGE_MASK),
2694 ioapic_phys);
2695 idx++;
2696
2697 ioapic_res->start = ioapic_phys;
2698 ioapic_res->end = ioapic_phys + IO_APIC_SLOT_SIZE - 1;
2699 ioapic_res++;
2700 }
2701}
2702
2703void __init ioapic_insert_resources(void)
2704{
2705 int i;
2706 struct resource *r = ioapic_resources;
2707
2708 if (!r) {
2709 if (nr_ioapics > 0)
2710 printk(KERN_ERR
2711 "IO APIC resources couldn't be allocated.\n");
2712 return;
2713 }
2714
2715 for_each_ioapic(i) {
2716 insert_resource(&iomem_resource, r);
2717 r++;
2718 }
2719}
2720
2721int mp_find_ioapic(u32 gsi)
2722{
2723 int i;
2724
2725 if (nr_ioapics == 0)
2726 return -1;
2727
2728 /* Find the IOAPIC that manages this GSI. */
2729 for_each_ioapic(i) {
2730 struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(i);
2731 if (gsi >= gsi_cfg->gsi_base && gsi <= gsi_cfg->gsi_end)
2732 return i;
2733 }
2734
2735 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
2736 return -1;
2737}
2738
2739int mp_find_ioapic_pin(int ioapic, u32 gsi)
2740{
2741 struct mp_ioapic_gsi *gsi_cfg;
2742
2743 if (WARN_ON(ioapic < 0))
2744 return -1;
2745
2746 gsi_cfg = mp_ioapic_gsi_routing(ioapic);
2747 if (WARN_ON(gsi > gsi_cfg->gsi_end))
2748 return -1;
2749
2750 return gsi - gsi_cfg->gsi_base;
2751}
2752
2753static int bad_ioapic_register(int idx)
2754{
2755 union IO_APIC_reg_00 reg_00;
2756 union IO_APIC_reg_01 reg_01;
2757 union IO_APIC_reg_02 reg_02;
2758
2759 reg_00.raw = io_apic_read(idx, 0);
2760 reg_01.raw = io_apic_read(idx, 1);
2761 reg_02.raw = io_apic_read(idx, 2);
2762
2763 if (reg_00.raw == -1 && reg_01.raw == -1 && reg_02.raw == -1) {
2764 pr_warn("I/O APIC 0x%x registers return all ones, skipping!\n",
2765 mpc_ioapic_addr(idx));
2766 return 1;
2767 }
2768
2769 return 0;
2770}
2771
2772static int find_free_ioapic_entry(void)
2773{
2774 int idx;
2775
2776 for (idx = 0; idx < MAX_IO_APICS; idx++)
2777 if (ioapics[idx].nr_registers == 0)
2778 return idx;
2779
2780 return MAX_IO_APICS;
2781}
2782
2783/**
2784 * mp_register_ioapic - Register an IOAPIC device
2785 * @id: hardware IOAPIC ID
2786 * @address: physical address of IOAPIC register area
2787 * @gsi_base: base of GSI associated with the IOAPIC
2788 * @cfg: configuration information for the IOAPIC
2789 */
2790int mp_register_ioapic(int id, u32 address, u32 gsi_base,
2791 struct ioapic_domain_cfg *cfg)
2792{
2793 bool hotplug = !!ioapic_initialized;
2794 struct mp_ioapic_gsi *gsi_cfg;
2795 int idx, ioapic, entries;
2796 u32 gsi_end;
2797
2798 if (!address) {
2799 pr_warn("Bogus (zero) I/O APIC address found, skipping!\n");
2800 return -EINVAL;
2801 }
2802 for_each_ioapic(ioapic)
2803 if (ioapics[ioapic].mp_config.apicaddr == address) {
2804 pr_warn("address 0x%x conflicts with IOAPIC%d\n",
2805 address, ioapic);
2806 return -EEXIST;
2807 }
2808
2809 idx = find_free_ioapic_entry();
2810 if (idx >= MAX_IO_APICS) {
2811 pr_warn("Max # of I/O APICs (%d) exceeded (found %d), skipping\n",
2812 MAX_IO_APICS, idx);
2813 return -ENOSPC;
2814 }
2815
2816 ioapics[idx].mp_config.type = MP_IOAPIC;
2817 ioapics[idx].mp_config.flags = MPC_APIC_USABLE;
2818 ioapics[idx].mp_config.apicaddr = address;
2819
2820 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
2821 if (bad_ioapic_register(idx)) {
2822 clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
2823 return -ENODEV;
2824 }
2825
2826 ioapics[idx].mp_config.apicid = io_apic_unique_id(idx, id);
2827 ioapics[idx].mp_config.apicver = io_apic_get_version(idx);
2828
2829 /*
2830 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
2831 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
2832 */
2833 entries = io_apic_get_redir_entries(idx);
2834 gsi_end = gsi_base + entries - 1;
2835 for_each_ioapic(ioapic) {
2836 gsi_cfg = mp_ioapic_gsi_routing(ioapic);
2837 if ((gsi_base >= gsi_cfg->gsi_base &&
2838 gsi_base <= gsi_cfg->gsi_end) ||
2839 (gsi_end >= gsi_cfg->gsi_base &&
2840 gsi_end <= gsi_cfg->gsi_end)) {
2841 pr_warn("GSI range [%u-%u] for new IOAPIC conflicts with GSI[%u-%u]\n",
2842 gsi_base, gsi_end,
2843 gsi_cfg->gsi_base, gsi_cfg->gsi_end);
2844 clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
2845 return -ENOSPC;
2846 }
2847 }
2848 gsi_cfg = mp_ioapic_gsi_routing(idx);
2849 gsi_cfg->gsi_base = gsi_base;
2850 gsi_cfg->gsi_end = gsi_end;
2851
2852 ioapics[idx].irqdomain = NULL;
2853 ioapics[idx].irqdomain_cfg = *cfg;
2854
2855 /*
2856 * If mp_register_ioapic() is called during early boot stage when
2857 * walking ACPI/SFI/DT tables, it's too early to create irqdomain,
2858 * we are still using bootmem allocator. So delay it to setup_IO_APIC().
2859 */
2860 if (hotplug) {
2861 if (mp_irqdomain_create(idx)) {
2862 clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
2863 return -ENOMEM;
2864 }
2865 alloc_ioapic_saved_registers(idx);
2866 }
2867
2868 if (gsi_cfg->gsi_end >= gsi_top)
2869 gsi_top = gsi_cfg->gsi_end + 1;
2870 if (nr_ioapics <= idx)
2871 nr_ioapics = idx + 1;
2872
2873 /* Set nr_registers to mark entry present */
2874 ioapics[idx].nr_registers = entries;
2875
2876 pr_info("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, GSI %d-%d\n",
2877 idx, mpc_ioapic_id(idx),
2878 mpc_ioapic_ver(idx), mpc_ioapic_addr(idx),
2879 gsi_cfg->gsi_base, gsi_cfg->gsi_end);
2880
2881 return 0;
2882}
2883
2884int mp_unregister_ioapic(u32 gsi_base)
2885{
2886 int ioapic, pin;
2887 int found = 0;
2888
2889 for_each_ioapic(ioapic)
2890 if (ioapics[ioapic].gsi_config.gsi_base == gsi_base) {
2891 found = 1;
2892 break;
2893 }
2894 if (!found) {
2895 pr_warn("can't find IOAPIC for GSI %d\n", gsi_base);
2896 return -ENODEV;
2897 }
2898
2899 for_each_pin(ioapic, pin) {
2900 u32 gsi = mp_pin_to_gsi(ioapic, pin);
2901 int irq = mp_map_gsi_to_irq(gsi, 0, NULL);
2902 struct mp_chip_data *data;
2903
2904 if (irq >= 0) {
2905 data = irq_get_chip_data(irq);
2906 if (data && data->count) {
2907 pr_warn("pin%d on IOAPIC%d is still in use.\n",
2908 pin, ioapic);
2909 return -EBUSY;
2910 }
2911 }
2912 }
2913
2914 /* Mark entry not present */
2915 ioapics[ioapic].nr_registers = 0;
2916 ioapic_destroy_irqdomain(ioapic);
2917 free_ioapic_saved_registers(ioapic);
2918 if (ioapics[ioapic].iomem_res)
2919 release_resource(ioapics[ioapic].iomem_res);
2920 clear_fixmap(FIX_IO_APIC_BASE_0 + ioapic);
2921 memset(&ioapics[ioapic], 0, sizeof(ioapics[ioapic]));
2922
2923 return 0;
2924}
2925
2926int mp_ioapic_registered(u32 gsi_base)
2927{
2928 int ioapic;
2929
2930 for_each_ioapic(ioapic)
2931 if (ioapics[ioapic].gsi_config.gsi_base == gsi_base)
2932 return 1;
2933
2934 return 0;
2935}
2936
2937static void mp_irqdomain_get_attr(u32 gsi, struct mp_chip_data *data,
2938 struct irq_alloc_info *info)
2939{
2940 if (info && info->ioapic_valid) {
2941 data->trigger = info->ioapic_trigger;
2942 data->polarity = info->ioapic_polarity;
2943 } else if (acpi_get_override_irq(gsi, &data->trigger,
2944 &data->polarity) < 0) {
2945 /* PCI interrupts are always active low level triggered. */
2946 data->trigger = IOAPIC_LEVEL;
2947 data->polarity = IOAPIC_POL_LOW;
2948 }
2949}
2950
2951static void mp_setup_entry(struct irq_cfg *cfg, struct mp_chip_data *data,
2952 struct IO_APIC_route_entry *entry)
2953{
2954 memset(entry, 0, sizeof(*entry));
2955 entry->delivery_mode = apic->irq_delivery_mode;
2956 entry->dest_mode = apic->irq_dest_mode;
2957 entry->dest = cfg->dest_apicid;
2958 entry->vector = cfg->vector;
2959 entry->trigger = data->trigger;
2960 entry->polarity = data->polarity;
2961 /*
2962 * Mask level triggered irqs. Edge triggered irqs are masked
2963 * by the irq core code in case they fire.
2964 */
2965 if (data->trigger == IOAPIC_LEVEL)
2966 entry->mask = IOAPIC_MASKED;
2967 else
2968 entry->mask = IOAPIC_UNMASKED;
2969}
2970
2971int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
2972 unsigned int nr_irqs, void *arg)
2973{
2974 int ret, ioapic, pin;
2975 struct irq_cfg *cfg;
2976 struct irq_data *irq_data;
2977 struct mp_chip_data *data;
2978 struct irq_alloc_info *info = arg;
2979 unsigned long flags;
2980
2981 if (!info || nr_irqs > 1)
2982 return -EINVAL;
2983 irq_data = irq_domain_get_irq_data(domain, virq);
2984 if (!irq_data)
2985 return -EINVAL;
2986
2987 ioapic = mp_irqdomain_ioapic_idx(domain);
2988 pin = info->ioapic_pin;
2989 if (irq_find_mapping(domain, (irq_hw_number_t)pin) > 0)
2990 return -EEXIST;
2991
2992 data = kzalloc(sizeof(*data), GFP_KERNEL);
2993 if (!data)
2994 return -ENOMEM;
2995
2996 info->ioapic_entry = &data->entry;
2997 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, info);
2998 if (ret < 0) {
2999 kfree(data);
3000 return ret;
3001 }
3002
3003 INIT_LIST_HEAD(&data->irq_2_pin);
3004 irq_data->hwirq = info->ioapic_pin;
3005 irq_data->chip = (domain->parent == x86_vector_domain) ?
3006 &ioapic_chip : &ioapic_ir_chip;
3007 irq_data->chip_data = data;
3008 mp_irqdomain_get_attr(mp_pin_to_gsi(ioapic, pin), data, info);
3009
3010 cfg = irqd_cfg(irq_data);
3011 add_pin_to_irq_node(data, ioapic_alloc_attr_node(info), ioapic, pin);
3012
3013 local_irq_save(flags);
3014 if (info->ioapic_entry)
3015 mp_setup_entry(cfg, data, info->ioapic_entry);
3016 mp_register_handler(virq, data->trigger);
3017 if (virq < nr_legacy_irqs())
3018 legacy_pic->mask(virq);
3019 local_irq_restore(flags);
3020
3021 apic_printk(APIC_VERBOSE, KERN_DEBUG
3022 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i Dest:%d)\n",
3023 ioapic, mpc_ioapic_id(ioapic), pin, cfg->vector,
3024 virq, data->trigger, data->polarity, cfg->dest_apicid);
3025
3026 return 0;
3027}
3028
3029void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq,
3030 unsigned int nr_irqs)
3031{
3032 struct irq_data *irq_data;
3033 struct mp_chip_data *data;
3034
3035 BUG_ON(nr_irqs != 1);
3036 irq_data = irq_domain_get_irq_data(domain, virq);
3037 if (irq_data && irq_data->chip_data) {
3038 data = irq_data->chip_data;
3039 __remove_pin_from_irq(data, mp_irqdomain_ioapic_idx(domain),
3040 (int)irq_data->hwirq);
3041 WARN_ON(!list_empty(&data->irq_2_pin));
3042 kfree(irq_data->chip_data);
3043 }
3044 irq_domain_free_irqs_top(domain, virq, nr_irqs);
3045}
3046
3047int mp_irqdomain_activate(struct irq_domain *domain,
3048 struct irq_data *irq_data, bool reserve)
3049{
3050 unsigned long flags;
3051
3052 raw_spin_lock_irqsave(&ioapic_lock, flags);
3053 ioapic_configure_entry(irq_data);
3054 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
3055 return 0;
3056}
3057
3058void mp_irqdomain_deactivate(struct irq_domain *domain,
3059 struct irq_data *irq_data)
3060{
3061 /* It won't be called for IRQ with multiple IOAPIC pins associated */
3062 ioapic_mask_entry(mp_irqdomain_ioapic_idx(domain),
3063 (int)irq_data->hwirq);
3064}
3065
3066int mp_irqdomain_ioapic_idx(struct irq_domain *domain)
3067{
3068 return (int)(long)domain->host_data;
3069}
3070
3071const struct irq_domain_ops mp_ioapic_irqdomain_ops = {
3072 .alloc = mp_irqdomain_alloc,
3073 .free = mp_irqdomain_free,
3074 .activate = mp_irqdomain_activate,
3075 .deactivate = mp_irqdomain_deactivate,
3076};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel IO-APIC support for multi-Pentium hosts.
4 *
5 * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
6 *
7 * Many thanks to Stig Venaas for trying out countless experimental
8 * patches and reporting/debugging problems patiently!
9 *
10 * (c) 1999, Multiple IO-APIC support, developed by
11 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
12 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
13 * further tested and cleaned up by Zach Brown <zab@redhat.com>
14 * and Ingo Molnar <mingo@redhat.com>
15 *
16 * Fixes
17 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
18 * thanks to Eric Gilmore
19 * and Rolf G. Tews
20 * for testing these extensively
21 * Paul Diefenbaugh : Added full ACPI support
22 *
23 * Historical information which is worth to be preserved:
24 *
25 * - SiS APIC rmw bug:
26 *
27 * We used to have a workaround for a bug in SiS chips which
28 * required to rewrite the index register for a read-modify-write
29 * operation as the chip lost the index information which was
30 * setup for the read already. We cache the data now, so that
31 * workaround has been removed.
32 */
33
34#include <linux/mm.h>
35#include <linux/interrupt.h>
36#include <linux/init.h>
37#include <linux/delay.h>
38#include <linux/sched.h>
39#include <linux/pci.h>
40#include <linux/mc146818rtc.h>
41#include <linux/compiler.h>
42#include <linux/acpi.h>
43#include <linux/export.h>
44#include <linux/syscore_ops.h>
45#include <linux/freezer.h>
46#include <linux/kthread.h>
47#include <linux/jiffies.h> /* time_after() */
48#include <linux/slab.h>
49#include <linux/bootmem.h>
50
51#include <asm/irqdomain.h>
52#include <asm/io.h>
53#include <asm/smp.h>
54#include <asm/cpu.h>
55#include <asm/desc.h>
56#include <asm/proto.h>
57#include <asm/acpi.h>
58#include <asm/dma.h>
59#include <asm/timer.h>
60#include <asm/i8259.h>
61#include <asm/setup.h>
62#include <asm/irq_remapping.h>
63#include <asm/hw_irq.h>
64
65#include <asm/apic.h>
66
67#define for_each_ioapic(idx) \
68 for ((idx) = 0; (idx) < nr_ioapics; (idx)++)
69#define for_each_ioapic_reverse(idx) \
70 for ((idx) = nr_ioapics - 1; (idx) >= 0; (idx)--)
71#define for_each_pin(idx, pin) \
72 for ((pin) = 0; (pin) < ioapics[(idx)].nr_registers; (pin)++)
73#define for_each_ioapic_pin(idx, pin) \
74 for_each_ioapic((idx)) \
75 for_each_pin((idx), (pin))
76#define for_each_irq_pin(entry, head) \
77 list_for_each_entry(entry, &head, list)
78
79static DEFINE_RAW_SPINLOCK(ioapic_lock);
80static DEFINE_MUTEX(ioapic_mutex);
81static unsigned int ioapic_dynirq_base;
82static int ioapic_initialized;
83
84struct irq_pin_list {
85 struct list_head list;
86 int apic, pin;
87};
88
89struct mp_chip_data {
90 struct list_head irq_2_pin;
91 struct IO_APIC_route_entry entry;
92 int trigger;
93 int polarity;
94 u32 count;
95 bool isa_irq;
96};
97
98struct mp_ioapic_gsi {
99 u32 gsi_base;
100 u32 gsi_end;
101};
102
103static struct ioapic {
104 /*
105 * # of IRQ routing registers
106 */
107 int nr_registers;
108 /*
109 * Saved state during suspend/resume, or while enabling intr-remap.
110 */
111 struct IO_APIC_route_entry *saved_registers;
112 /* I/O APIC config */
113 struct mpc_ioapic mp_config;
114 /* IO APIC gsi routing info */
115 struct mp_ioapic_gsi gsi_config;
116 struct ioapic_domain_cfg irqdomain_cfg;
117 struct irq_domain *irqdomain;
118 struct resource *iomem_res;
119} ioapics[MAX_IO_APICS];
120
121#define mpc_ioapic_ver(ioapic_idx) ioapics[ioapic_idx].mp_config.apicver
122
123int mpc_ioapic_id(int ioapic_idx)
124{
125 return ioapics[ioapic_idx].mp_config.apicid;
126}
127
128unsigned int mpc_ioapic_addr(int ioapic_idx)
129{
130 return ioapics[ioapic_idx].mp_config.apicaddr;
131}
132
133static inline struct mp_ioapic_gsi *mp_ioapic_gsi_routing(int ioapic_idx)
134{
135 return &ioapics[ioapic_idx].gsi_config;
136}
137
138static inline int mp_ioapic_pin_count(int ioapic)
139{
140 struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
141
142 return gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
143}
144
145static inline u32 mp_pin_to_gsi(int ioapic, int pin)
146{
147 return mp_ioapic_gsi_routing(ioapic)->gsi_base + pin;
148}
149
150static inline bool mp_is_legacy_irq(int irq)
151{
152 return irq >= 0 && irq < nr_legacy_irqs();
153}
154
155/*
156 * Initialize all legacy IRQs and all pins on the first IOAPIC
157 * if we have legacy interrupt controller. Kernel boot option "pirq="
158 * may rely on non-legacy pins on the first IOAPIC.
159 */
160static inline int mp_init_irq_at_boot(int ioapic, int irq)
161{
162 if (!nr_legacy_irqs())
163 return 0;
164
165 return ioapic == 0 || mp_is_legacy_irq(irq);
166}
167
168static inline struct irq_domain *mp_ioapic_irqdomain(int ioapic)
169{
170 return ioapics[ioapic].irqdomain;
171}
172
173int nr_ioapics;
174
175/* The one past the highest gsi number used */
176u32 gsi_top;
177
178/* MP IRQ source entries */
179struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
180
181/* # of MP IRQ source entries */
182int mp_irq_entries;
183
184#ifdef CONFIG_EISA
185int mp_bus_id_to_type[MAX_MP_BUSSES];
186#endif
187
188DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
189
190int skip_ioapic_setup;
191
192/**
193 * disable_ioapic_support() - disables ioapic support at runtime
194 */
195void disable_ioapic_support(void)
196{
197#ifdef CONFIG_PCI
198 noioapicquirk = 1;
199 noioapicreroute = -1;
200#endif
201 skip_ioapic_setup = 1;
202}
203
204static int __init parse_noapic(char *str)
205{
206 /* disable IO-APIC */
207 disable_ioapic_support();
208 return 0;
209}
210early_param("noapic", parse_noapic);
211
212/* Will be called in mpparse/acpi/sfi codes for saving IRQ info */
213void mp_save_irq(struct mpc_intsrc *m)
214{
215 int i;
216
217 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
218 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
219 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
220 m->srcbusirq, m->dstapic, m->dstirq);
221
222 for (i = 0; i < mp_irq_entries; i++) {
223 if (!memcmp(&mp_irqs[i], m, sizeof(*m)))
224 return;
225 }
226
227 memcpy(&mp_irqs[mp_irq_entries], m, sizeof(*m));
228 if (++mp_irq_entries == MAX_IRQ_SOURCES)
229 panic("Max # of irq sources exceeded!!\n");
230}
231
232static void alloc_ioapic_saved_registers(int idx)
233{
234 size_t size;
235
236 if (ioapics[idx].saved_registers)
237 return;
238
239 size = sizeof(struct IO_APIC_route_entry) * ioapics[idx].nr_registers;
240 ioapics[idx].saved_registers = kzalloc(size, GFP_KERNEL);
241 if (!ioapics[idx].saved_registers)
242 pr_err("IOAPIC %d: suspend/resume impossible!\n", idx);
243}
244
245static void free_ioapic_saved_registers(int idx)
246{
247 kfree(ioapics[idx].saved_registers);
248 ioapics[idx].saved_registers = NULL;
249}
250
251int __init arch_early_ioapic_init(void)
252{
253 int i;
254
255 if (!nr_legacy_irqs())
256 io_apic_irqs = ~0UL;
257
258 for_each_ioapic(i)
259 alloc_ioapic_saved_registers(i);
260
261 return 0;
262}
263
264struct io_apic {
265 unsigned int index;
266 unsigned int unused[3];
267 unsigned int data;
268 unsigned int unused2[11];
269 unsigned int eoi;
270};
271
272static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
273{
274 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
275 + (mpc_ioapic_addr(idx) & ~PAGE_MASK);
276}
277
278static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
279{
280 struct io_apic __iomem *io_apic = io_apic_base(apic);
281 writel(vector, &io_apic->eoi);
282}
283
284unsigned int native_io_apic_read(unsigned int apic, unsigned int reg)
285{
286 struct io_apic __iomem *io_apic = io_apic_base(apic);
287 writel(reg, &io_apic->index);
288 return readl(&io_apic->data);
289}
290
291static void io_apic_write(unsigned int apic, unsigned int reg,
292 unsigned int value)
293{
294 struct io_apic __iomem *io_apic = io_apic_base(apic);
295
296 writel(reg, &io_apic->index);
297 writel(value, &io_apic->data);
298}
299
300union entry_union {
301 struct { u32 w1, w2; };
302 struct IO_APIC_route_entry entry;
303};
304
305static struct IO_APIC_route_entry __ioapic_read_entry(int apic, int pin)
306{
307 union entry_union eu;
308
309 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
310 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
311
312 return eu.entry;
313}
314
315static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
316{
317 union entry_union eu;
318 unsigned long flags;
319
320 raw_spin_lock_irqsave(&ioapic_lock, flags);
321 eu.entry = __ioapic_read_entry(apic, pin);
322 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
323
324 return eu.entry;
325}
326
327/*
328 * When we write a new IO APIC routing entry, we need to write the high
329 * word first! If the mask bit in the low word is clear, we will enable
330 * the interrupt, and we need to make sure the entry is fully populated
331 * before that happens.
332 */
333static void __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
334{
335 union entry_union eu = {{0, 0}};
336
337 eu.entry = e;
338 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
339 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
340}
341
342static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
343{
344 unsigned long flags;
345
346 raw_spin_lock_irqsave(&ioapic_lock, flags);
347 __ioapic_write_entry(apic, pin, e);
348 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
349}
350
351/*
352 * When we mask an IO APIC routing entry, we need to write the low
353 * word first, in order to set the mask bit before we change the
354 * high bits!
355 */
356static void ioapic_mask_entry(int apic, int pin)
357{
358 unsigned long flags;
359 union entry_union eu = { .entry.mask = IOAPIC_MASKED };
360
361 raw_spin_lock_irqsave(&ioapic_lock, flags);
362 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
363 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
364 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
365}
366
367/*
368 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
369 * shared ISA-space IRQs, so we have to support them. We are super
370 * fast in the common case, and fast for shared ISA-space IRQs.
371 */
372static int __add_pin_to_irq_node(struct mp_chip_data *data,
373 int node, int apic, int pin)
374{
375 struct irq_pin_list *entry;
376
377 /* don't allow duplicates */
378 for_each_irq_pin(entry, data->irq_2_pin)
379 if (entry->apic == apic && entry->pin == pin)
380 return 0;
381
382 entry = kzalloc_node(sizeof(struct irq_pin_list), GFP_ATOMIC, node);
383 if (!entry) {
384 pr_err("can not alloc irq_pin_list (%d,%d,%d)\n",
385 node, apic, pin);
386 return -ENOMEM;
387 }
388 entry->apic = apic;
389 entry->pin = pin;
390 list_add_tail(&entry->list, &data->irq_2_pin);
391
392 return 0;
393}
394
395static void __remove_pin_from_irq(struct mp_chip_data *data, int apic, int pin)
396{
397 struct irq_pin_list *tmp, *entry;
398
399 list_for_each_entry_safe(entry, tmp, &data->irq_2_pin, list)
400 if (entry->apic == apic && entry->pin == pin) {
401 list_del(&entry->list);
402 kfree(entry);
403 return;
404 }
405}
406
407static void add_pin_to_irq_node(struct mp_chip_data *data,
408 int node, int apic, int pin)
409{
410 if (__add_pin_to_irq_node(data, node, apic, pin))
411 panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
412}
413
414/*
415 * Reroute an IRQ to a different pin.
416 */
417static void __init replace_pin_at_irq_node(struct mp_chip_data *data, int node,
418 int oldapic, int oldpin,
419 int newapic, int newpin)
420{
421 struct irq_pin_list *entry;
422
423 for_each_irq_pin(entry, data->irq_2_pin) {
424 if (entry->apic == oldapic && entry->pin == oldpin) {
425 entry->apic = newapic;
426 entry->pin = newpin;
427 /* every one is different, right? */
428 return;
429 }
430 }
431
432 /* old apic/pin didn't exist, so just add new ones */
433 add_pin_to_irq_node(data, node, newapic, newpin);
434}
435
436static void io_apic_modify_irq(struct mp_chip_data *data,
437 int mask_and, int mask_or,
438 void (*final)(struct irq_pin_list *entry))
439{
440 union entry_union eu;
441 struct irq_pin_list *entry;
442
443 eu.entry = data->entry;
444 eu.w1 &= mask_and;
445 eu.w1 |= mask_or;
446 data->entry = eu.entry;
447
448 for_each_irq_pin(entry, data->irq_2_pin) {
449 io_apic_write(entry->apic, 0x10 + 2 * entry->pin, eu.w1);
450 if (final)
451 final(entry);
452 }
453}
454
455static void io_apic_sync(struct irq_pin_list *entry)
456{
457 /*
458 * Synchronize the IO-APIC and the CPU by doing
459 * a dummy read from the IO-APIC
460 */
461 struct io_apic __iomem *io_apic;
462
463 io_apic = io_apic_base(entry->apic);
464 readl(&io_apic->data);
465}
466
467static void mask_ioapic_irq(struct irq_data *irq_data)
468{
469 struct mp_chip_data *data = irq_data->chip_data;
470 unsigned long flags;
471
472 raw_spin_lock_irqsave(&ioapic_lock, flags);
473 io_apic_modify_irq(data, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
474 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
475}
476
477static void __unmask_ioapic(struct mp_chip_data *data)
478{
479 io_apic_modify_irq(data, ~IO_APIC_REDIR_MASKED, 0, NULL);
480}
481
482static void unmask_ioapic_irq(struct irq_data *irq_data)
483{
484 struct mp_chip_data *data = irq_data->chip_data;
485 unsigned long flags;
486
487 raw_spin_lock_irqsave(&ioapic_lock, flags);
488 __unmask_ioapic(data);
489 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
490}
491
492/*
493 * IO-APIC versions below 0x20 don't support EOI register.
494 * For the record, here is the information about various versions:
495 * 0Xh 82489DX
496 * 1Xh I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
497 * 2Xh I/O(x)APIC which is PCI 2.2 Compliant
498 * 30h-FFh Reserved
499 *
500 * Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
501 * version as 0x2. This is an error with documentation and these ICH chips
502 * use io-apic's of version 0x20.
503 *
504 * For IO-APIC's with EOI register, we use that to do an explicit EOI.
505 * Otherwise, we simulate the EOI message manually by changing the trigger
506 * mode to edge and then back to level, with RTE being masked during this.
507 */
508static void __eoi_ioapic_pin(int apic, int pin, int vector)
509{
510 if (mpc_ioapic_ver(apic) >= 0x20) {
511 io_apic_eoi(apic, vector);
512 } else {
513 struct IO_APIC_route_entry entry, entry1;
514
515 entry = entry1 = __ioapic_read_entry(apic, pin);
516
517 /*
518 * Mask the entry and change the trigger mode to edge.
519 */
520 entry1.mask = IOAPIC_MASKED;
521 entry1.trigger = IOAPIC_EDGE;
522
523 __ioapic_write_entry(apic, pin, entry1);
524
525 /*
526 * Restore the previous level triggered entry.
527 */
528 __ioapic_write_entry(apic, pin, entry);
529 }
530}
531
532static void eoi_ioapic_pin(int vector, struct mp_chip_data *data)
533{
534 unsigned long flags;
535 struct irq_pin_list *entry;
536
537 raw_spin_lock_irqsave(&ioapic_lock, flags);
538 for_each_irq_pin(entry, data->irq_2_pin)
539 __eoi_ioapic_pin(entry->apic, entry->pin, vector);
540 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
541}
542
543static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
544{
545 struct IO_APIC_route_entry entry;
546
547 /* Check delivery_mode to be sure we're not clearing an SMI pin */
548 entry = ioapic_read_entry(apic, pin);
549 if (entry.delivery_mode == dest_SMI)
550 return;
551
552 /*
553 * Make sure the entry is masked and re-read the contents to check
554 * if it is a level triggered pin and if the remote-IRR is set.
555 */
556 if (entry.mask == IOAPIC_UNMASKED) {
557 entry.mask = IOAPIC_MASKED;
558 ioapic_write_entry(apic, pin, entry);
559 entry = ioapic_read_entry(apic, pin);
560 }
561
562 if (entry.irr) {
563 unsigned long flags;
564
565 /*
566 * Make sure the trigger mode is set to level. Explicit EOI
567 * doesn't clear the remote-IRR if the trigger mode is not
568 * set to level.
569 */
570 if (entry.trigger == IOAPIC_EDGE) {
571 entry.trigger = IOAPIC_LEVEL;
572 ioapic_write_entry(apic, pin, entry);
573 }
574 raw_spin_lock_irqsave(&ioapic_lock, flags);
575 __eoi_ioapic_pin(apic, pin, entry.vector);
576 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
577 }
578
579 /*
580 * Clear the rest of the bits in the IO-APIC RTE except for the mask
581 * bit.
582 */
583 ioapic_mask_entry(apic, pin);
584 entry = ioapic_read_entry(apic, pin);
585 if (entry.irr)
586 pr_err("Unable to reset IRR for apic: %d, pin :%d\n",
587 mpc_ioapic_id(apic), pin);
588}
589
590void clear_IO_APIC (void)
591{
592 int apic, pin;
593
594 for_each_ioapic_pin(apic, pin)
595 clear_IO_APIC_pin(apic, pin);
596}
597
598#ifdef CONFIG_X86_32
599/*
600 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
601 * specific CPU-side IRQs.
602 */
603
604#define MAX_PIRQS 8
605static int pirq_entries[MAX_PIRQS] = {
606 [0 ... MAX_PIRQS - 1] = -1
607};
608
609static int __init ioapic_pirq_setup(char *str)
610{
611 int i, max;
612 int ints[MAX_PIRQS+1];
613
614 get_options(str, ARRAY_SIZE(ints), ints);
615
616 apic_printk(APIC_VERBOSE, KERN_INFO
617 "PIRQ redirection, working around broken MP-BIOS.\n");
618 max = MAX_PIRQS;
619 if (ints[0] < MAX_PIRQS)
620 max = ints[0];
621
622 for (i = 0; i < max; i++) {
623 apic_printk(APIC_VERBOSE, KERN_DEBUG
624 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
625 /*
626 * PIRQs are mapped upside down, usually.
627 */
628 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
629 }
630 return 1;
631}
632
633__setup("pirq=", ioapic_pirq_setup);
634#endif /* CONFIG_X86_32 */
635
636/*
637 * Saves all the IO-APIC RTE's
638 */
639int save_ioapic_entries(void)
640{
641 int apic, pin;
642 int err = 0;
643
644 for_each_ioapic(apic) {
645 if (!ioapics[apic].saved_registers) {
646 err = -ENOMEM;
647 continue;
648 }
649
650 for_each_pin(apic, pin)
651 ioapics[apic].saved_registers[pin] =
652 ioapic_read_entry(apic, pin);
653 }
654
655 return err;
656}
657
658/*
659 * Mask all IO APIC entries.
660 */
661void mask_ioapic_entries(void)
662{
663 int apic, pin;
664
665 for_each_ioapic(apic) {
666 if (!ioapics[apic].saved_registers)
667 continue;
668
669 for_each_pin(apic, pin) {
670 struct IO_APIC_route_entry entry;
671
672 entry = ioapics[apic].saved_registers[pin];
673 if (entry.mask == IOAPIC_UNMASKED) {
674 entry.mask = IOAPIC_MASKED;
675 ioapic_write_entry(apic, pin, entry);
676 }
677 }
678 }
679}
680
681/*
682 * Restore IO APIC entries which was saved in the ioapic structure.
683 */
684int restore_ioapic_entries(void)
685{
686 int apic, pin;
687
688 for_each_ioapic(apic) {
689 if (!ioapics[apic].saved_registers)
690 continue;
691
692 for_each_pin(apic, pin)
693 ioapic_write_entry(apic, pin,
694 ioapics[apic].saved_registers[pin]);
695 }
696 return 0;
697}
698
699/*
700 * Find the IRQ entry number of a certain pin.
701 */
702static int find_irq_entry(int ioapic_idx, int pin, int type)
703{
704 int i;
705
706 for (i = 0; i < mp_irq_entries; i++)
707 if (mp_irqs[i].irqtype == type &&
708 (mp_irqs[i].dstapic == mpc_ioapic_id(ioapic_idx) ||
709 mp_irqs[i].dstapic == MP_APIC_ALL) &&
710 mp_irqs[i].dstirq == pin)
711 return i;
712
713 return -1;
714}
715
716/*
717 * Find the pin to which IRQ[irq] (ISA) is connected
718 */
719static 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].srcbus;
725
726 if (test_bit(lbus, mp_bus_not_pci) &&
727 (mp_irqs[i].irqtype == type) &&
728 (mp_irqs[i].srcbusirq == irq))
729
730 return mp_irqs[i].dstirq;
731 }
732 return -1;
733}
734
735static 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].srcbus;
741
742 if (test_bit(lbus, mp_bus_not_pci) &&
743 (mp_irqs[i].irqtype == type) &&
744 (mp_irqs[i].srcbusirq == irq))
745 break;
746 }
747
748 if (i < mp_irq_entries) {
749 int ioapic_idx;
750
751 for_each_ioapic(ioapic_idx)
752 if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic)
753 return ioapic_idx;
754 }
755
756 return -1;
757}
758
759#ifdef CONFIG_EISA
760/*
761 * EISA Edge/Level control register, ELCR
762 */
763static int EISA_ELCR(unsigned int irq)
764{
765 if (irq < nr_legacy_irqs()) {
766 unsigned int port = 0x4d0 + (irq >> 3);
767 return (inb(port) >> (irq & 7)) & 1;
768 }
769 apic_printk(APIC_VERBOSE, KERN_INFO
770 "Broken MPtable reports ISA irq %d\n", irq);
771 return 0;
772}
773
774#endif
775
776/* ISA interrupts are always active high edge triggered,
777 * when listed as conforming in the MP table. */
778
779#define default_ISA_trigger(idx) (IOAPIC_EDGE)
780#define default_ISA_polarity(idx) (IOAPIC_POL_HIGH)
781
782/* EISA interrupts are always polarity zero and can be edge or level
783 * trigger depending on the ELCR value. If an interrupt is listed as
784 * EISA conforming in the MP table, that means its trigger type must
785 * be read in from the ELCR */
786
787#define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
788#define default_EISA_polarity(idx) default_ISA_polarity(idx)
789
790/* PCI interrupts are always active low level triggered,
791 * when listed as conforming in the MP table. */
792
793#define default_PCI_trigger(idx) (IOAPIC_LEVEL)
794#define default_PCI_polarity(idx) (IOAPIC_POL_LOW)
795
796static int irq_polarity(int idx)
797{
798 int bus = mp_irqs[idx].srcbus;
799
800 /*
801 * Determine IRQ line polarity (high active or low active):
802 */
803 switch (mp_irqs[idx].irqflag & MP_IRQPOL_MASK) {
804 case MP_IRQPOL_DEFAULT:
805 /* conforms to spec, ie. bus-type dependent polarity */
806 if (test_bit(bus, mp_bus_not_pci))
807 return default_ISA_polarity(idx);
808 else
809 return default_PCI_polarity(idx);
810 case MP_IRQPOL_ACTIVE_HIGH:
811 return IOAPIC_POL_HIGH;
812 case MP_IRQPOL_RESERVED:
813 pr_warn("IOAPIC: Invalid polarity: 2, defaulting to low\n");
814 case MP_IRQPOL_ACTIVE_LOW:
815 default: /* Pointless default required due to do gcc stupidity */
816 return IOAPIC_POL_LOW;
817 }
818}
819
820#ifdef CONFIG_EISA
821static int eisa_irq_trigger(int idx, int bus, int trigger)
822{
823 switch (mp_bus_id_to_type[bus]) {
824 case MP_BUS_PCI:
825 case MP_BUS_ISA:
826 return trigger;
827 case MP_BUS_EISA:
828 return default_EISA_trigger(idx);
829 }
830 pr_warn("IOAPIC: Invalid srcbus: %d defaulting to level\n", bus);
831 return IOAPIC_LEVEL;
832}
833#else
834static inline int eisa_irq_trigger(int idx, int bus, int trigger)
835{
836 return trigger;
837}
838#endif
839
840static int irq_trigger(int idx)
841{
842 int bus = mp_irqs[idx].srcbus;
843 int trigger;
844
845 /*
846 * Determine IRQ trigger mode (edge or level sensitive):
847 */
848 switch (mp_irqs[idx].irqflag & MP_IRQTRIG_MASK) {
849 case MP_IRQTRIG_DEFAULT:
850 /* conforms to spec, ie. bus-type dependent trigger mode */
851 if (test_bit(bus, mp_bus_not_pci))
852 trigger = default_ISA_trigger(idx);
853 else
854 trigger = default_PCI_trigger(idx);
855 /* Take EISA into account */
856 return eisa_irq_trigger(idx, bus, trigger);
857 case MP_IRQTRIG_EDGE:
858 return IOAPIC_EDGE;
859 case MP_IRQTRIG_RESERVED:
860 pr_warn("IOAPIC: Invalid trigger mode 2 defaulting to level\n");
861 case MP_IRQTRIG_LEVEL:
862 default: /* Pointless default required due to do gcc stupidity */
863 return IOAPIC_LEVEL;
864 }
865}
866
867void ioapic_set_alloc_attr(struct irq_alloc_info *info, int node,
868 int trigger, int polarity)
869{
870 init_irq_alloc_info(info, NULL);
871 info->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
872 info->ioapic_node = node;
873 info->ioapic_trigger = trigger;
874 info->ioapic_polarity = polarity;
875 info->ioapic_valid = 1;
876}
877
878#ifndef CONFIG_ACPI
879int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
880#endif
881
882static void ioapic_copy_alloc_attr(struct irq_alloc_info *dst,
883 struct irq_alloc_info *src,
884 u32 gsi, int ioapic_idx, int pin)
885{
886 int trigger, polarity;
887
888 copy_irq_alloc_info(dst, src);
889 dst->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
890 dst->ioapic_id = mpc_ioapic_id(ioapic_idx);
891 dst->ioapic_pin = pin;
892 dst->ioapic_valid = 1;
893 if (src && src->ioapic_valid) {
894 dst->ioapic_node = src->ioapic_node;
895 dst->ioapic_trigger = src->ioapic_trigger;
896 dst->ioapic_polarity = src->ioapic_polarity;
897 } else {
898 dst->ioapic_node = NUMA_NO_NODE;
899 if (acpi_get_override_irq(gsi, &trigger, &polarity) >= 0) {
900 dst->ioapic_trigger = trigger;
901 dst->ioapic_polarity = polarity;
902 } else {
903 /*
904 * PCI interrupts are always active low level
905 * triggered.
906 */
907 dst->ioapic_trigger = IOAPIC_LEVEL;
908 dst->ioapic_polarity = IOAPIC_POL_LOW;
909 }
910 }
911}
912
913static int ioapic_alloc_attr_node(struct irq_alloc_info *info)
914{
915 return (info && info->ioapic_valid) ? info->ioapic_node : NUMA_NO_NODE;
916}
917
918static void mp_register_handler(unsigned int irq, unsigned long trigger)
919{
920 irq_flow_handler_t hdl;
921 bool fasteoi;
922
923 if (trigger) {
924 irq_set_status_flags(irq, IRQ_LEVEL);
925 fasteoi = true;
926 } else {
927 irq_clear_status_flags(irq, IRQ_LEVEL);
928 fasteoi = false;
929 }
930
931 hdl = fasteoi ? handle_fasteoi_irq : handle_edge_irq;
932 __irq_set_handler(irq, hdl, 0, fasteoi ? "fasteoi" : "edge");
933}
934
935static bool mp_check_pin_attr(int irq, struct irq_alloc_info *info)
936{
937 struct mp_chip_data *data = irq_get_chip_data(irq);
938
939 /*
940 * setup_IO_APIC_irqs() programs all legacy IRQs with default trigger
941 * and polarity attirbutes. So allow the first user to reprogram the
942 * pin with real trigger and polarity attributes.
943 */
944 if (irq < nr_legacy_irqs() && data->count == 1) {
945 if (info->ioapic_trigger != data->trigger)
946 mp_register_handler(irq, info->ioapic_trigger);
947 data->entry.trigger = data->trigger = info->ioapic_trigger;
948 data->entry.polarity = data->polarity = info->ioapic_polarity;
949 }
950
951 return data->trigger == info->ioapic_trigger &&
952 data->polarity == info->ioapic_polarity;
953}
954
955static int alloc_irq_from_domain(struct irq_domain *domain, int ioapic, u32 gsi,
956 struct irq_alloc_info *info)
957{
958 bool legacy = false;
959 int irq = -1;
960 int type = ioapics[ioapic].irqdomain_cfg.type;
961
962 switch (type) {
963 case IOAPIC_DOMAIN_LEGACY:
964 /*
965 * Dynamically allocate IRQ number for non-ISA IRQs in the first
966 * 16 GSIs on some weird platforms.
967 */
968 if (!ioapic_initialized || gsi >= nr_legacy_irqs())
969 irq = gsi;
970 legacy = mp_is_legacy_irq(irq);
971 break;
972 case IOAPIC_DOMAIN_STRICT:
973 irq = gsi;
974 break;
975 case IOAPIC_DOMAIN_DYNAMIC:
976 break;
977 default:
978 WARN(1, "ioapic: unknown irqdomain type %d\n", type);
979 return -1;
980 }
981
982 return __irq_domain_alloc_irqs(domain, irq, 1,
983 ioapic_alloc_attr_node(info),
984 info, legacy, NULL);
985}
986
987/*
988 * Need special handling for ISA IRQs because there may be multiple IOAPIC pins
989 * sharing the same ISA IRQ number and irqdomain only supports 1:1 mapping
990 * between IOAPIC pin and IRQ number. A typical IOAPIC has 24 pins, pin 0-15 are
991 * used for legacy IRQs and pin 16-23 are used for PCI IRQs (PIRQ A-H).
992 * When ACPI is disabled, only legacy IRQ numbers (IRQ0-15) are available, and
993 * some BIOSes may use MP Interrupt Source records to override IRQ numbers for
994 * PIRQs instead of reprogramming the interrupt routing logic. Thus there may be
995 * multiple pins sharing the same legacy IRQ number when ACPI is disabled.
996 */
997static int alloc_isa_irq_from_domain(struct irq_domain *domain,
998 int irq, int ioapic, int pin,
999 struct irq_alloc_info *info)
1000{
1001 struct mp_chip_data *data;
1002 struct irq_data *irq_data = irq_get_irq_data(irq);
1003 int node = ioapic_alloc_attr_node(info);
1004
1005 /*
1006 * Legacy ISA IRQ has already been allocated, just add pin to
1007 * the pin list assoicated with this IRQ and program the IOAPIC
1008 * entry. The IOAPIC entry
1009 */
1010 if (irq_data && irq_data->parent_data) {
1011 if (!mp_check_pin_attr(irq, info))
1012 return -EBUSY;
1013 if (__add_pin_to_irq_node(irq_data->chip_data, node, ioapic,
1014 info->ioapic_pin))
1015 return -ENOMEM;
1016 } else {
1017 info->flags |= X86_IRQ_ALLOC_LEGACY;
1018 irq = __irq_domain_alloc_irqs(domain, irq, 1, node, info, true,
1019 NULL);
1020 if (irq >= 0) {
1021 irq_data = irq_domain_get_irq_data(domain, irq);
1022 data = irq_data->chip_data;
1023 data->isa_irq = true;
1024 }
1025 }
1026
1027 return irq;
1028}
1029
1030static int mp_map_pin_to_irq(u32 gsi, int idx, int ioapic, int pin,
1031 unsigned int flags, struct irq_alloc_info *info)
1032{
1033 int irq;
1034 bool legacy = false;
1035 struct irq_alloc_info tmp;
1036 struct mp_chip_data *data;
1037 struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
1038
1039 if (!domain)
1040 return -ENOSYS;
1041
1042 if (idx >= 0 && test_bit(mp_irqs[idx].srcbus, mp_bus_not_pci)) {
1043 irq = mp_irqs[idx].srcbusirq;
1044 legacy = mp_is_legacy_irq(irq);
1045 }
1046
1047 mutex_lock(&ioapic_mutex);
1048 if (!(flags & IOAPIC_MAP_ALLOC)) {
1049 if (!legacy) {
1050 irq = irq_find_mapping(domain, pin);
1051 if (irq == 0)
1052 irq = -ENOENT;
1053 }
1054 } else {
1055 ioapic_copy_alloc_attr(&tmp, info, gsi, ioapic, pin);
1056 if (legacy)
1057 irq = alloc_isa_irq_from_domain(domain, irq,
1058 ioapic, pin, &tmp);
1059 else if ((irq = irq_find_mapping(domain, pin)) == 0)
1060 irq = alloc_irq_from_domain(domain, ioapic, gsi, &tmp);
1061 else if (!mp_check_pin_attr(irq, &tmp))
1062 irq = -EBUSY;
1063 if (irq >= 0) {
1064 data = irq_get_chip_data(irq);
1065 data->count++;
1066 }
1067 }
1068 mutex_unlock(&ioapic_mutex);
1069
1070 return irq;
1071}
1072
1073static int pin_2_irq(int idx, int ioapic, int pin, unsigned int flags)
1074{
1075 u32 gsi = mp_pin_to_gsi(ioapic, pin);
1076
1077 /*
1078 * Debugging check, we are in big trouble if this message pops up!
1079 */
1080 if (mp_irqs[idx].dstirq != pin)
1081 pr_err("broken BIOS or MPTABLE parser, ayiee!!\n");
1082
1083#ifdef CONFIG_X86_32
1084 /*
1085 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1086 */
1087 if ((pin >= 16) && (pin <= 23)) {
1088 if (pirq_entries[pin-16] != -1) {
1089 if (!pirq_entries[pin-16]) {
1090 apic_printk(APIC_VERBOSE, KERN_DEBUG
1091 "disabling PIRQ%d\n", pin-16);
1092 } else {
1093 int irq = pirq_entries[pin-16];
1094 apic_printk(APIC_VERBOSE, KERN_DEBUG
1095 "using PIRQ%d -> IRQ %d\n",
1096 pin-16, irq);
1097 return irq;
1098 }
1099 }
1100 }
1101#endif
1102
1103 return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, NULL);
1104}
1105
1106int mp_map_gsi_to_irq(u32 gsi, unsigned int flags, struct irq_alloc_info *info)
1107{
1108 int ioapic, pin, idx;
1109
1110 ioapic = mp_find_ioapic(gsi);
1111 if (ioapic < 0)
1112 return -ENODEV;
1113
1114 pin = mp_find_ioapic_pin(ioapic, gsi);
1115 idx = find_irq_entry(ioapic, pin, mp_INT);
1116 if ((flags & IOAPIC_MAP_CHECK) && idx < 0)
1117 return -ENODEV;
1118
1119 return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, info);
1120}
1121
1122void mp_unmap_irq(int irq)
1123{
1124 struct irq_data *irq_data = irq_get_irq_data(irq);
1125 struct mp_chip_data *data;
1126
1127 if (!irq_data || !irq_data->domain)
1128 return;
1129
1130 data = irq_data->chip_data;
1131 if (!data || data->isa_irq)
1132 return;
1133
1134 mutex_lock(&ioapic_mutex);
1135 if (--data->count == 0)
1136 irq_domain_free_irqs(irq, 1);
1137 mutex_unlock(&ioapic_mutex);
1138}
1139
1140/*
1141 * Find a specific PCI IRQ entry.
1142 * Not an __init, possibly needed by modules
1143 */
1144int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
1145{
1146 int irq, i, best_ioapic = -1, best_idx = -1;
1147
1148 apic_printk(APIC_DEBUG,
1149 "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
1150 bus, slot, pin);
1151 if (test_bit(bus, mp_bus_not_pci)) {
1152 apic_printk(APIC_VERBOSE,
1153 "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
1154 return -1;
1155 }
1156
1157 for (i = 0; i < mp_irq_entries; i++) {
1158 int lbus = mp_irqs[i].srcbus;
1159 int ioapic_idx, found = 0;
1160
1161 if (bus != lbus || mp_irqs[i].irqtype != mp_INT ||
1162 slot != ((mp_irqs[i].srcbusirq >> 2) & 0x1f))
1163 continue;
1164
1165 for_each_ioapic(ioapic_idx)
1166 if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic ||
1167 mp_irqs[i].dstapic == MP_APIC_ALL) {
1168 found = 1;
1169 break;
1170 }
1171 if (!found)
1172 continue;
1173
1174 /* Skip ISA IRQs */
1175 irq = pin_2_irq(i, ioapic_idx, mp_irqs[i].dstirq, 0);
1176 if (irq > 0 && !IO_APIC_IRQ(irq))
1177 continue;
1178
1179 if (pin == (mp_irqs[i].srcbusirq & 3)) {
1180 best_idx = i;
1181 best_ioapic = ioapic_idx;
1182 goto out;
1183 }
1184
1185 /*
1186 * Use the first all-but-pin matching entry as a
1187 * best-guess fuzzy result for broken mptables.
1188 */
1189 if (best_idx < 0) {
1190 best_idx = i;
1191 best_ioapic = ioapic_idx;
1192 }
1193 }
1194 if (best_idx < 0)
1195 return -1;
1196
1197out:
1198 return pin_2_irq(best_idx, best_ioapic, mp_irqs[best_idx].dstirq,
1199 IOAPIC_MAP_ALLOC);
1200}
1201EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
1202
1203static struct irq_chip ioapic_chip, ioapic_ir_chip;
1204
1205static void __init setup_IO_APIC_irqs(void)
1206{
1207 unsigned int ioapic, pin;
1208 int idx;
1209
1210 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1211
1212 for_each_ioapic_pin(ioapic, pin) {
1213 idx = find_irq_entry(ioapic, pin, mp_INT);
1214 if (idx < 0)
1215 apic_printk(APIC_VERBOSE,
1216 KERN_DEBUG " apic %d pin %d not connected\n",
1217 mpc_ioapic_id(ioapic), pin);
1218 else
1219 pin_2_irq(idx, ioapic, pin,
1220 ioapic ? 0 : IOAPIC_MAP_ALLOC);
1221 }
1222}
1223
1224void ioapic_zap_locks(void)
1225{
1226 raw_spin_lock_init(&ioapic_lock);
1227}
1228
1229static void io_apic_print_entries(unsigned int apic, unsigned int nr_entries)
1230{
1231 int i;
1232 char buf[256];
1233 struct IO_APIC_route_entry entry;
1234 struct IR_IO_APIC_route_entry *ir_entry = (void *)&entry;
1235
1236 printk(KERN_DEBUG "IOAPIC %d:\n", apic);
1237 for (i = 0; i <= nr_entries; i++) {
1238 entry = ioapic_read_entry(apic, i);
1239 snprintf(buf, sizeof(buf),
1240 " pin%02x, %s, %s, %s, V(%02X), IRR(%1d), S(%1d)",
1241 i,
1242 entry.mask == IOAPIC_MASKED ? "disabled" : "enabled ",
1243 entry.trigger == IOAPIC_LEVEL ? "level" : "edge ",
1244 entry.polarity == IOAPIC_POL_LOW ? "low " : "high",
1245 entry.vector, entry.irr, entry.delivery_status);
1246 if (ir_entry->format)
1247 printk(KERN_DEBUG "%s, remapped, I(%04X), Z(%X)\n",
1248 buf, (ir_entry->index2 << 15) | ir_entry->index,
1249 ir_entry->zero);
1250 else
1251 printk(KERN_DEBUG "%s, %s, D(%02X), M(%1d)\n",
1252 buf,
1253 entry.dest_mode == IOAPIC_DEST_MODE_LOGICAL ?
1254 "logical " : "physical",
1255 entry.dest, entry.delivery_mode);
1256 }
1257}
1258
1259static void __init print_IO_APIC(int ioapic_idx)
1260{
1261 union IO_APIC_reg_00 reg_00;
1262 union IO_APIC_reg_01 reg_01;
1263 union IO_APIC_reg_02 reg_02;
1264 union IO_APIC_reg_03 reg_03;
1265 unsigned long flags;
1266
1267 raw_spin_lock_irqsave(&ioapic_lock, flags);
1268 reg_00.raw = io_apic_read(ioapic_idx, 0);
1269 reg_01.raw = io_apic_read(ioapic_idx, 1);
1270 if (reg_01.bits.version >= 0x10)
1271 reg_02.raw = io_apic_read(ioapic_idx, 2);
1272 if (reg_01.bits.version >= 0x20)
1273 reg_03.raw = io_apic_read(ioapic_idx, 3);
1274 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1275
1276 printk(KERN_DEBUG "IO APIC #%d......\n", mpc_ioapic_id(ioapic_idx));
1277 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1278 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1279 printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
1280 printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
1281
1282 printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
1283 printk(KERN_DEBUG "....... : max redirection entries: %02X\n",
1284 reg_01.bits.entries);
1285
1286 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1287 printk(KERN_DEBUG "....... : IO APIC version: %02X\n",
1288 reg_01.bits.version);
1289
1290 /*
1291 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1292 * but the value of reg_02 is read as the previous read register
1293 * value, so ignore it if reg_02 == reg_01.
1294 */
1295 if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1296 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1297 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1298 }
1299
1300 /*
1301 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1302 * or reg_03, but the value of reg_0[23] is read as the previous read
1303 * register value, so ignore it if reg_03 == reg_0[12].
1304 */
1305 if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1306 reg_03.raw != reg_01.raw) {
1307 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1308 printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
1309 }
1310
1311 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1312 io_apic_print_entries(ioapic_idx, reg_01.bits.entries);
1313}
1314
1315void __init print_IO_APICs(void)
1316{
1317 int ioapic_idx;
1318 unsigned int irq;
1319
1320 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1321 for_each_ioapic(ioapic_idx)
1322 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1323 mpc_ioapic_id(ioapic_idx),
1324 ioapics[ioapic_idx].nr_registers);
1325
1326 /*
1327 * We are a bit conservative about what we expect. We have to
1328 * know about every hardware change ASAP.
1329 */
1330 printk(KERN_INFO "testing the IO APIC.......................\n");
1331
1332 for_each_ioapic(ioapic_idx)
1333 print_IO_APIC(ioapic_idx);
1334
1335 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1336 for_each_active_irq(irq) {
1337 struct irq_pin_list *entry;
1338 struct irq_chip *chip;
1339 struct mp_chip_data *data;
1340
1341 chip = irq_get_chip(irq);
1342 if (chip != &ioapic_chip && chip != &ioapic_ir_chip)
1343 continue;
1344 data = irq_get_chip_data(irq);
1345 if (!data)
1346 continue;
1347 if (list_empty(&data->irq_2_pin))
1348 continue;
1349
1350 printk(KERN_DEBUG "IRQ%d ", irq);
1351 for_each_irq_pin(entry, data->irq_2_pin)
1352 pr_cont("-> %d:%d", entry->apic, entry->pin);
1353 pr_cont("\n");
1354 }
1355
1356 printk(KERN_INFO ".................................... done.\n");
1357}
1358
1359/* Where if anywhere is the i8259 connect in external int mode */
1360static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
1361
1362void __init enable_IO_APIC(void)
1363{
1364 int i8259_apic, i8259_pin;
1365 int apic, pin;
1366
1367 if (skip_ioapic_setup)
1368 nr_ioapics = 0;
1369
1370 if (!nr_legacy_irqs() || !nr_ioapics)
1371 return;
1372
1373 for_each_ioapic_pin(apic, pin) {
1374 /* See if any of the pins is in ExtINT mode */
1375 struct IO_APIC_route_entry entry = ioapic_read_entry(apic, pin);
1376
1377 /* If the interrupt line is enabled and in ExtInt mode
1378 * I have found the pin where the i8259 is connected.
1379 */
1380 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1381 ioapic_i8259.apic = apic;
1382 ioapic_i8259.pin = pin;
1383 goto found_i8259;
1384 }
1385 }
1386 found_i8259:
1387 /* Look to see what if the MP table has reported the ExtINT */
1388 /* If we could not find the appropriate pin by looking at the ioapic
1389 * the i8259 probably is not connected the ioapic but give the
1390 * mptable a chance anyway.
1391 */
1392 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1393 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1394 /* Trust the MP table if nothing is setup in the hardware */
1395 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1396 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1397 ioapic_i8259.pin = i8259_pin;
1398 ioapic_i8259.apic = i8259_apic;
1399 }
1400 /* Complain if the MP table and the hardware disagree */
1401 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1402 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1403 {
1404 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1405 }
1406
1407 /*
1408 * Do not trust the IO-APIC being empty at bootup
1409 */
1410 clear_IO_APIC();
1411}
1412
1413void native_restore_boot_irq_mode(void)
1414{
1415 /*
1416 * If the i8259 is routed through an IOAPIC
1417 * Put that IOAPIC in virtual wire mode
1418 * so legacy interrupts can be delivered.
1419 */
1420 if (ioapic_i8259.pin != -1) {
1421 struct IO_APIC_route_entry entry;
1422
1423 memset(&entry, 0, sizeof(entry));
1424 entry.mask = IOAPIC_UNMASKED;
1425 entry.trigger = IOAPIC_EDGE;
1426 entry.polarity = IOAPIC_POL_HIGH;
1427 entry.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
1428 entry.delivery_mode = dest_ExtINT;
1429 entry.dest = read_apic_id();
1430
1431 /*
1432 * Add it to the IO-APIC irq-routing table:
1433 */
1434 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1435 }
1436
1437 if (boot_cpu_has(X86_FEATURE_APIC) || apic_from_smp_config())
1438 disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1439}
1440
1441void restore_boot_irq_mode(void)
1442{
1443 if (!nr_legacy_irqs())
1444 return;
1445
1446 x86_apic_ops.restore();
1447}
1448
1449#ifdef CONFIG_X86_32
1450/*
1451 * function to set the IO-APIC physical IDs based on the
1452 * values stored in the MPC table.
1453 *
1454 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
1455 */
1456void __init setup_ioapic_ids_from_mpc_nocheck(void)
1457{
1458 union IO_APIC_reg_00 reg_00;
1459 physid_mask_t phys_id_present_map;
1460 int ioapic_idx;
1461 int i;
1462 unsigned char old_id;
1463 unsigned long flags;
1464
1465 /*
1466 * This is broken; anything with a real cpu count has to
1467 * circumvent this idiocy regardless.
1468 */
1469 apic->ioapic_phys_id_map(&phys_cpu_present_map, &phys_id_present_map);
1470
1471 /*
1472 * Set the IOAPIC ID to the value stored in the MPC table.
1473 */
1474 for_each_ioapic(ioapic_idx) {
1475 /* Read the register 0 value */
1476 raw_spin_lock_irqsave(&ioapic_lock, flags);
1477 reg_00.raw = io_apic_read(ioapic_idx, 0);
1478 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1479
1480 old_id = mpc_ioapic_id(ioapic_idx);
1481
1482 if (mpc_ioapic_id(ioapic_idx) >= get_physical_broadcast()) {
1483 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
1484 ioapic_idx, mpc_ioapic_id(ioapic_idx));
1485 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1486 reg_00.bits.ID);
1487 ioapics[ioapic_idx].mp_config.apicid = reg_00.bits.ID;
1488 }
1489
1490 /*
1491 * Sanity check, is the ID really free? Every APIC in a
1492 * system must have a unique ID or we get lots of nice
1493 * 'stuck on smp_invalidate_needed IPI wait' messages.
1494 */
1495 if (apic->check_apicid_used(&phys_id_present_map,
1496 mpc_ioapic_id(ioapic_idx))) {
1497 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
1498 ioapic_idx, mpc_ioapic_id(ioapic_idx));
1499 for (i = 0; i < get_physical_broadcast(); i++)
1500 if (!physid_isset(i, phys_id_present_map))
1501 break;
1502 if (i >= get_physical_broadcast())
1503 panic("Max APIC ID exceeded!\n");
1504 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1505 i);
1506 physid_set(i, phys_id_present_map);
1507 ioapics[ioapic_idx].mp_config.apicid = i;
1508 } else {
1509 physid_mask_t tmp;
1510 apic->apicid_to_cpu_present(mpc_ioapic_id(ioapic_idx),
1511 &tmp);
1512 apic_printk(APIC_VERBOSE, "Setting %d in the "
1513 "phys_id_present_map\n",
1514 mpc_ioapic_id(ioapic_idx));
1515 physids_or(phys_id_present_map, phys_id_present_map, tmp);
1516 }
1517
1518 /*
1519 * We need to adjust the IRQ routing table
1520 * if the ID changed.
1521 */
1522 if (old_id != mpc_ioapic_id(ioapic_idx))
1523 for (i = 0; i < mp_irq_entries; i++)
1524 if (mp_irqs[i].dstapic == old_id)
1525 mp_irqs[i].dstapic
1526 = mpc_ioapic_id(ioapic_idx);
1527
1528 /*
1529 * Update the ID register according to the right value
1530 * from the MPC table if they are different.
1531 */
1532 if (mpc_ioapic_id(ioapic_idx) == reg_00.bits.ID)
1533 continue;
1534
1535 apic_printk(APIC_VERBOSE, KERN_INFO
1536 "...changing IO-APIC physical APIC ID to %d ...",
1537 mpc_ioapic_id(ioapic_idx));
1538
1539 reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
1540 raw_spin_lock_irqsave(&ioapic_lock, flags);
1541 io_apic_write(ioapic_idx, 0, reg_00.raw);
1542 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1543
1544 /*
1545 * Sanity check
1546 */
1547 raw_spin_lock_irqsave(&ioapic_lock, flags);
1548 reg_00.raw = io_apic_read(ioapic_idx, 0);
1549 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1550 if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx))
1551 pr_cont("could not set ID!\n");
1552 else
1553 apic_printk(APIC_VERBOSE, " ok.\n");
1554 }
1555}
1556
1557void __init setup_ioapic_ids_from_mpc(void)
1558{
1559
1560 if (acpi_ioapic)
1561 return;
1562 /*
1563 * Don't check I/O APIC IDs for xAPIC systems. They have
1564 * no meaning without the serial APIC bus.
1565 */
1566 if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
1567 || APIC_XAPIC(boot_cpu_apic_version))
1568 return;
1569 setup_ioapic_ids_from_mpc_nocheck();
1570}
1571#endif
1572
1573int no_timer_check __initdata;
1574
1575static int __init notimercheck(char *s)
1576{
1577 no_timer_check = 1;
1578 return 1;
1579}
1580__setup("no_timer_check", notimercheck);
1581
1582static void __init delay_with_tsc(void)
1583{
1584 unsigned long long start, now;
1585 unsigned long end = jiffies + 4;
1586
1587 start = rdtsc();
1588
1589 /*
1590 * We don't know the TSC frequency yet, but waiting for
1591 * 40000000000/HZ TSC cycles is safe:
1592 * 4 GHz == 10 jiffies
1593 * 1 GHz == 40 jiffies
1594 */
1595 do {
1596 rep_nop();
1597 now = rdtsc();
1598 } while ((now - start) < 40000000000ULL / HZ &&
1599 time_before_eq(jiffies, end));
1600}
1601
1602static void __init delay_without_tsc(void)
1603{
1604 unsigned long end = jiffies + 4;
1605 int band = 1;
1606
1607 /*
1608 * We don't know any frequency yet, but waiting for
1609 * 40940000000/HZ cycles is safe:
1610 * 4 GHz == 10 jiffies
1611 * 1 GHz == 40 jiffies
1612 * 1 << 1 + 1 << 2 +...+ 1 << 11 = 4094
1613 */
1614 do {
1615 __delay(((1U << band++) * 10000000UL) / HZ);
1616 } while (band < 12 && time_before_eq(jiffies, end));
1617}
1618
1619/*
1620 * There is a nasty bug in some older SMP boards, their mptable lies
1621 * about the timer IRQ. We do the following to work around the situation:
1622 *
1623 * - timer IRQ defaults to IO-APIC IRQ
1624 * - if this function detects that timer IRQs are defunct, then we fall
1625 * back to ISA timer IRQs
1626 */
1627static int __init timer_irq_works(void)
1628{
1629 unsigned long t1 = jiffies;
1630 unsigned long flags;
1631
1632 if (no_timer_check)
1633 return 1;
1634
1635 local_save_flags(flags);
1636 local_irq_enable();
1637
1638 if (boot_cpu_has(X86_FEATURE_TSC))
1639 delay_with_tsc();
1640 else
1641 delay_without_tsc();
1642
1643 local_irq_restore(flags);
1644
1645 /*
1646 * Expect a few ticks at least, to be sure some possible
1647 * glue logic does not lock up after one or two first
1648 * ticks in a non-ExtINT mode. Also the local APIC
1649 * might have cached one ExtINT interrupt. Finally, at
1650 * least one tick may be lost due to delays.
1651 */
1652
1653 /* jiffies wrap? */
1654 if (time_after(jiffies, t1 + 4))
1655 return 1;
1656 return 0;
1657}
1658
1659/*
1660 * In the SMP+IOAPIC case it might happen that there are an unspecified
1661 * number of pending IRQ events unhandled. These cases are very rare,
1662 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1663 * better to do it this way as thus we do not have to be aware of
1664 * 'pending' interrupts in the IRQ path, except at this point.
1665 */
1666/*
1667 * Edge triggered needs to resend any interrupt
1668 * that was delayed but this is now handled in the device
1669 * independent code.
1670 */
1671
1672/*
1673 * Starting up a edge-triggered IO-APIC interrupt is
1674 * nasty - we need to make sure that we get the edge.
1675 * If it is already asserted for some reason, we need
1676 * return 1 to indicate that is was pending.
1677 *
1678 * This is not complete - we should be able to fake
1679 * an edge even if it isn't on the 8259A...
1680 */
1681static unsigned int startup_ioapic_irq(struct irq_data *data)
1682{
1683 int was_pending = 0, irq = data->irq;
1684 unsigned long flags;
1685
1686 raw_spin_lock_irqsave(&ioapic_lock, flags);
1687 if (irq < nr_legacy_irqs()) {
1688 legacy_pic->mask(irq);
1689 if (legacy_pic->irq_pending(irq))
1690 was_pending = 1;
1691 }
1692 __unmask_ioapic(data->chip_data);
1693 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1694
1695 return was_pending;
1696}
1697
1698atomic_t irq_mis_count;
1699
1700#ifdef CONFIG_GENERIC_PENDING_IRQ
1701static bool io_apic_level_ack_pending(struct mp_chip_data *data)
1702{
1703 struct irq_pin_list *entry;
1704 unsigned long flags;
1705
1706 raw_spin_lock_irqsave(&ioapic_lock, flags);
1707 for_each_irq_pin(entry, data->irq_2_pin) {
1708 unsigned int reg;
1709 int pin;
1710
1711 pin = entry->pin;
1712 reg = io_apic_read(entry->apic, 0x10 + pin*2);
1713 /* Is the remote IRR bit set? */
1714 if (reg & IO_APIC_REDIR_REMOTE_IRR) {
1715 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1716 return true;
1717 }
1718 }
1719 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1720
1721 return false;
1722}
1723
1724static inline bool ioapic_irqd_mask(struct irq_data *data)
1725{
1726 /* If we are moving the irq we need to mask it */
1727 if (unlikely(irqd_is_setaffinity_pending(data))) {
1728 mask_ioapic_irq(data);
1729 return true;
1730 }
1731 return false;
1732}
1733
1734static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
1735{
1736 if (unlikely(masked)) {
1737 /* Only migrate the irq if the ack has been received.
1738 *
1739 * On rare occasions the broadcast level triggered ack gets
1740 * delayed going to ioapics, and if we reprogram the
1741 * vector while Remote IRR is still set the irq will never
1742 * fire again.
1743 *
1744 * To prevent this scenario we read the Remote IRR bit
1745 * of the ioapic. This has two effects.
1746 * - On any sane system the read of the ioapic will
1747 * flush writes (and acks) going to the ioapic from
1748 * this cpu.
1749 * - We get to see if the ACK has actually been delivered.
1750 *
1751 * Based on failed experiments of reprogramming the
1752 * ioapic entry from outside of irq context starting
1753 * with masking the ioapic entry and then polling until
1754 * Remote IRR was clear before reprogramming the
1755 * ioapic I don't trust the Remote IRR bit to be
1756 * completey accurate.
1757 *
1758 * However there appears to be no other way to plug
1759 * this race, so if the Remote IRR bit is not
1760 * accurate and is causing problems then it is a hardware bug
1761 * and you can go talk to the chipset vendor about it.
1762 */
1763 if (!io_apic_level_ack_pending(data->chip_data))
1764 irq_move_masked_irq(data);
1765 unmask_ioapic_irq(data);
1766 }
1767}
1768#else
1769static inline bool ioapic_irqd_mask(struct irq_data *data)
1770{
1771 return false;
1772}
1773static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
1774{
1775}
1776#endif
1777
1778static void ioapic_ack_level(struct irq_data *irq_data)
1779{
1780 struct irq_cfg *cfg = irqd_cfg(irq_data);
1781 unsigned long v;
1782 bool masked;
1783 int i;
1784
1785 irq_complete_move(cfg);
1786 masked = ioapic_irqd_mask(irq_data);
1787
1788 /*
1789 * It appears there is an erratum which affects at least version 0x11
1790 * of I/O APIC (that's the 82093AA and cores integrated into various
1791 * chipsets). Under certain conditions a level-triggered interrupt is
1792 * erroneously delivered as edge-triggered one but the respective IRR
1793 * bit gets set nevertheless. As a result the I/O unit expects an EOI
1794 * message but it will never arrive and further interrupts are blocked
1795 * from the source. The exact reason is so far unknown, but the
1796 * phenomenon was observed when two consecutive interrupt requests
1797 * from a given source get delivered to the same CPU and the source is
1798 * temporarily disabled in between.
1799 *
1800 * A workaround is to simulate an EOI message manually. We achieve it
1801 * by setting the trigger mode to edge and then to level when the edge
1802 * trigger mode gets detected in the TMR of a local APIC for a
1803 * level-triggered interrupt. We mask the source for the time of the
1804 * operation to prevent an edge-triggered interrupt escaping meanwhile.
1805 * The idea is from Manfred Spraul. --macro
1806 *
1807 * Also in the case when cpu goes offline, fixup_irqs() will forward
1808 * any unhandled interrupt on the offlined cpu to the new cpu
1809 * destination that is handling the corresponding interrupt. This
1810 * interrupt forwarding is done via IPI's. Hence, in this case also
1811 * level-triggered io-apic interrupt will be seen as an edge
1812 * interrupt in the IRR. And we can't rely on the cpu's EOI
1813 * to be broadcasted to the IO-APIC's which will clear the remoteIRR
1814 * corresponding to the level-triggered interrupt. Hence on IO-APIC's
1815 * supporting EOI register, we do an explicit EOI to clear the
1816 * remote IRR and on IO-APIC's which don't have an EOI register,
1817 * we use the above logic (mask+edge followed by unmask+level) from
1818 * Manfred Spraul to clear the remote IRR.
1819 */
1820 i = cfg->vector;
1821 v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
1822
1823 /*
1824 * We must acknowledge the irq before we move it or the acknowledge will
1825 * not propagate properly.
1826 */
1827 ack_APIC_irq();
1828
1829 /*
1830 * Tail end of clearing remote IRR bit (either by delivering the EOI
1831 * message via io-apic EOI register write or simulating it using
1832 * mask+edge followed by unnask+level logic) manually when the
1833 * level triggered interrupt is seen as the edge triggered interrupt
1834 * at the cpu.
1835 */
1836 if (!(v & (1 << (i & 0x1f)))) {
1837 atomic_inc(&irq_mis_count);
1838 eoi_ioapic_pin(cfg->vector, irq_data->chip_data);
1839 }
1840
1841 ioapic_irqd_unmask(irq_data, masked);
1842}
1843
1844static void ioapic_ir_ack_level(struct irq_data *irq_data)
1845{
1846 struct mp_chip_data *data = irq_data->chip_data;
1847
1848 /*
1849 * Intr-remapping uses pin number as the virtual vector
1850 * in the RTE. Actual vector is programmed in
1851 * intr-remapping table entry. Hence for the io-apic
1852 * EOI we use the pin number.
1853 */
1854 ack_APIC_irq();
1855 eoi_ioapic_pin(data->entry.vector, data);
1856}
1857
1858static void ioapic_configure_entry(struct irq_data *irqd)
1859{
1860 struct mp_chip_data *mpd = irqd->chip_data;
1861 struct irq_cfg *cfg = irqd_cfg(irqd);
1862 struct irq_pin_list *entry;
1863
1864 /*
1865 * Only update when the parent is the vector domain, don't touch it
1866 * if the parent is the remapping domain. Check the installed
1867 * ioapic chip to verify that.
1868 */
1869 if (irqd->chip == &ioapic_chip) {
1870 mpd->entry.dest = cfg->dest_apicid;
1871 mpd->entry.vector = cfg->vector;
1872 }
1873 for_each_irq_pin(entry, mpd->irq_2_pin)
1874 __ioapic_write_entry(entry->apic, entry->pin, mpd->entry);
1875}
1876
1877static int ioapic_set_affinity(struct irq_data *irq_data,
1878 const struct cpumask *mask, bool force)
1879{
1880 struct irq_data *parent = irq_data->parent_data;
1881 unsigned long flags;
1882 int ret;
1883
1884 ret = parent->chip->irq_set_affinity(parent, mask, force);
1885 raw_spin_lock_irqsave(&ioapic_lock, flags);
1886 if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE)
1887 ioapic_configure_entry(irq_data);
1888 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1889
1890 return ret;
1891}
1892
1893static struct irq_chip ioapic_chip __read_mostly = {
1894 .name = "IO-APIC",
1895 .irq_startup = startup_ioapic_irq,
1896 .irq_mask = mask_ioapic_irq,
1897 .irq_unmask = unmask_ioapic_irq,
1898 .irq_ack = irq_chip_ack_parent,
1899 .irq_eoi = ioapic_ack_level,
1900 .irq_set_affinity = ioapic_set_affinity,
1901 .irq_retrigger = irq_chip_retrigger_hierarchy,
1902 .flags = IRQCHIP_SKIP_SET_WAKE,
1903};
1904
1905static struct irq_chip ioapic_ir_chip __read_mostly = {
1906 .name = "IR-IO-APIC",
1907 .irq_startup = startup_ioapic_irq,
1908 .irq_mask = mask_ioapic_irq,
1909 .irq_unmask = unmask_ioapic_irq,
1910 .irq_ack = irq_chip_ack_parent,
1911 .irq_eoi = ioapic_ir_ack_level,
1912 .irq_set_affinity = ioapic_set_affinity,
1913 .irq_retrigger = irq_chip_retrigger_hierarchy,
1914 .flags = IRQCHIP_SKIP_SET_WAKE,
1915};
1916
1917static inline void init_IO_APIC_traps(void)
1918{
1919 struct irq_cfg *cfg;
1920 unsigned int irq;
1921
1922 for_each_active_irq(irq) {
1923 cfg = irq_cfg(irq);
1924 if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
1925 /*
1926 * Hmm.. We don't have an entry for this,
1927 * so default to an old-fashioned 8259
1928 * interrupt if we can..
1929 */
1930 if (irq < nr_legacy_irqs())
1931 legacy_pic->make_irq(irq);
1932 else
1933 /* Strange. Oh, well.. */
1934 irq_set_chip(irq, &no_irq_chip);
1935 }
1936 }
1937}
1938
1939/*
1940 * The local APIC irq-chip implementation:
1941 */
1942
1943static void mask_lapic_irq(struct irq_data *data)
1944{
1945 unsigned long v;
1946
1947 v = apic_read(APIC_LVT0);
1948 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1949}
1950
1951static void unmask_lapic_irq(struct irq_data *data)
1952{
1953 unsigned long v;
1954
1955 v = apic_read(APIC_LVT0);
1956 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1957}
1958
1959static void ack_lapic_irq(struct irq_data *data)
1960{
1961 ack_APIC_irq();
1962}
1963
1964static struct irq_chip lapic_chip __read_mostly = {
1965 .name = "local-APIC",
1966 .irq_mask = mask_lapic_irq,
1967 .irq_unmask = unmask_lapic_irq,
1968 .irq_ack = ack_lapic_irq,
1969};
1970
1971static void lapic_register_intr(int irq)
1972{
1973 irq_clear_status_flags(irq, IRQ_LEVEL);
1974 irq_set_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
1975 "edge");
1976}
1977
1978/*
1979 * This looks a bit hackish but it's about the only one way of sending
1980 * a few INTA cycles to 8259As and any associated glue logic. ICR does
1981 * not support the ExtINT mode, unfortunately. We need to send these
1982 * cycles as some i82489DX-based boards have glue logic that keeps the
1983 * 8259A interrupt line asserted until INTA. --macro
1984 */
1985static inline void __init unlock_ExtINT_logic(void)
1986{
1987 int apic, pin, i;
1988 struct IO_APIC_route_entry entry0, entry1;
1989 unsigned char save_control, save_freq_select;
1990
1991 pin = find_isa_irq_pin(8, mp_INT);
1992 if (pin == -1) {
1993 WARN_ON_ONCE(1);
1994 return;
1995 }
1996 apic = find_isa_irq_apic(8, mp_INT);
1997 if (apic == -1) {
1998 WARN_ON_ONCE(1);
1999 return;
2000 }
2001
2002 entry0 = ioapic_read_entry(apic, pin);
2003 clear_IO_APIC_pin(apic, pin);
2004
2005 memset(&entry1, 0, sizeof(entry1));
2006
2007 entry1.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
2008 entry1.mask = IOAPIC_UNMASKED;
2009 entry1.dest = hard_smp_processor_id();
2010 entry1.delivery_mode = dest_ExtINT;
2011 entry1.polarity = entry0.polarity;
2012 entry1.trigger = IOAPIC_EDGE;
2013 entry1.vector = 0;
2014
2015 ioapic_write_entry(apic, pin, entry1);
2016
2017 save_control = CMOS_READ(RTC_CONTROL);
2018 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2019 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2020 RTC_FREQ_SELECT);
2021 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2022
2023 i = 100;
2024 while (i-- > 0) {
2025 mdelay(10);
2026 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2027 i -= 10;
2028 }
2029
2030 CMOS_WRITE(save_control, RTC_CONTROL);
2031 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2032 clear_IO_APIC_pin(apic, pin);
2033
2034 ioapic_write_entry(apic, pin, entry0);
2035}
2036
2037static int disable_timer_pin_1 __initdata;
2038/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2039static int __init disable_timer_pin_setup(char *arg)
2040{
2041 disable_timer_pin_1 = 1;
2042 return 0;
2043}
2044early_param("disable_timer_pin_1", disable_timer_pin_setup);
2045
2046static int mp_alloc_timer_irq(int ioapic, int pin)
2047{
2048 int irq = -1;
2049 struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
2050
2051 if (domain) {
2052 struct irq_alloc_info info;
2053
2054 ioapic_set_alloc_attr(&info, NUMA_NO_NODE, 0, 0);
2055 info.ioapic_id = mpc_ioapic_id(ioapic);
2056 info.ioapic_pin = pin;
2057 mutex_lock(&ioapic_mutex);
2058 irq = alloc_isa_irq_from_domain(domain, 0, ioapic, pin, &info);
2059 mutex_unlock(&ioapic_mutex);
2060 }
2061
2062 return irq;
2063}
2064
2065/*
2066 * This code may look a bit paranoid, but it's supposed to cooperate with
2067 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2068 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2069 * fanatically on his truly buggy board.
2070 *
2071 * FIXME: really need to revamp this for all platforms.
2072 */
2073static inline void __init check_timer(void)
2074{
2075 struct irq_data *irq_data = irq_get_irq_data(0);
2076 struct mp_chip_data *data = irq_data->chip_data;
2077 struct irq_cfg *cfg = irqd_cfg(irq_data);
2078 int node = cpu_to_node(0);
2079 int apic1, pin1, apic2, pin2;
2080 unsigned long flags;
2081 int no_pin1 = 0;
2082
2083 local_irq_save(flags);
2084
2085 /*
2086 * get/set the timer IRQ vector:
2087 */
2088 legacy_pic->mask(0);
2089
2090 /*
2091 * As IRQ0 is to be enabled in the 8259A, the virtual
2092 * wire has to be disabled in the local APIC. Also
2093 * timer interrupts need to be acknowledged manually in
2094 * the 8259A for the i82489DX when using the NMI
2095 * watchdog as that APIC treats NMIs as level-triggered.
2096 * The AEOI mode will finish them in the 8259A
2097 * automatically.
2098 */
2099 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2100 legacy_pic->init(1);
2101
2102 pin1 = find_isa_irq_pin(0, mp_INT);
2103 apic1 = find_isa_irq_apic(0, mp_INT);
2104 pin2 = ioapic_i8259.pin;
2105 apic2 = ioapic_i8259.apic;
2106
2107 apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
2108 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2109 cfg->vector, apic1, pin1, apic2, pin2);
2110
2111 /*
2112 * Some BIOS writers are clueless and report the ExtINTA
2113 * I/O APIC input from the cascaded 8259A as the timer
2114 * interrupt input. So just in case, if only one pin
2115 * was found above, try it both directly and through the
2116 * 8259A.
2117 */
2118 if (pin1 == -1) {
2119 panic_if_irq_remap("BIOS bug: timer not connected to IO-APIC");
2120 pin1 = pin2;
2121 apic1 = apic2;
2122 no_pin1 = 1;
2123 } else if (pin2 == -1) {
2124 pin2 = pin1;
2125 apic2 = apic1;
2126 }
2127
2128 if (pin1 != -1) {
2129 /* Ok, does IRQ0 through the IOAPIC work? */
2130 if (no_pin1) {
2131 mp_alloc_timer_irq(apic1, pin1);
2132 } else {
2133 /*
2134 * for edge trigger, it's already unmasked,
2135 * so only need to unmask if it is level-trigger
2136 * do we really have level trigger timer?
2137 */
2138 int idx;
2139 idx = find_irq_entry(apic1, pin1, mp_INT);
2140 if (idx != -1 && irq_trigger(idx))
2141 unmask_ioapic_irq(irq_get_irq_data(0));
2142 }
2143 irq_domain_deactivate_irq(irq_data);
2144 irq_domain_activate_irq(irq_data, false);
2145 if (timer_irq_works()) {
2146 if (disable_timer_pin_1 > 0)
2147 clear_IO_APIC_pin(0, pin1);
2148 goto out;
2149 }
2150 panic_if_irq_remap("timer doesn't work through Interrupt-remapped IO-APIC");
2151 local_irq_disable();
2152 clear_IO_APIC_pin(apic1, pin1);
2153 if (!no_pin1)
2154 apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
2155 "8254 timer not connected to IO-APIC\n");
2156
2157 apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
2158 "(IRQ0) through the 8259A ...\n");
2159 apic_printk(APIC_QUIET, KERN_INFO
2160 "..... (found apic %d pin %d) ...\n", apic2, pin2);
2161 /*
2162 * legacy devices should be connected to IO APIC #0
2163 */
2164 replace_pin_at_irq_node(data, node, apic1, pin1, apic2, pin2);
2165 irq_domain_deactivate_irq(irq_data);
2166 irq_domain_activate_irq(irq_data, false);
2167 legacy_pic->unmask(0);
2168 if (timer_irq_works()) {
2169 apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
2170 goto out;
2171 }
2172 /*
2173 * Cleanup, just in case ...
2174 */
2175 local_irq_disable();
2176 legacy_pic->mask(0);
2177 clear_IO_APIC_pin(apic2, pin2);
2178 apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
2179 }
2180
2181 apic_printk(APIC_QUIET, KERN_INFO
2182 "...trying to set up timer as Virtual Wire IRQ...\n");
2183
2184 lapic_register_intr(0);
2185 apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
2186 legacy_pic->unmask(0);
2187
2188 if (timer_irq_works()) {
2189 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2190 goto out;
2191 }
2192 local_irq_disable();
2193 legacy_pic->mask(0);
2194 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
2195 apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
2196
2197 apic_printk(APIC_QUIET, KERN_INFO
2198 "...trying to set up timer as ExtINT IRQ...\n");
2199
2200 legacy_pic->init(0);
2201 legacy_pic->make_irq(0);
2202 apic_write(APIC_LVT0, APIC_DM_EXTINT);
2203
2204 unlock_ExtINT_logic();
2205
2206 if (timer_irq_works()) {
2207 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2208 goto out;
2209 }
2210 local_irq_disable();
2211 apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
2212 if (apic_is_x2apic_enabled())
2213 apic_printk(APIC_QUIET, KERN_INFO
2214 "Perhaps problem with the pre-enabled x2apic mode\n"
2215 "Try booting with x2apic and interrupt-remapping disabled in the bios.\n");
2216 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
2217 "report. Then try booting with the 'noapic' option.\n");
2218out:
2219 local_irq_restore(flags);
2220}
2221
2222/*
2223 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
2224 * to devices. However there may be an I/O APIC pin available for
2225 * this interrupt regardless. The pin may be left unconnected, but
2226 * typically it will be reused as an ExtINT cascade interrupt for
2227 * the master 8259A. In the MPS case such a pin will normally be
2228 * reported as an ExtINT interrupt in the MP table. With ACPI
2229 * there is no provision for ExtINT interrupts, and in the absence
2230 * of an override it would be treated as an ordinary ISA I/O APIC
2231 * interrupt, that is edge-triggered and unmasked by default. We
2232 * used to do this, but it caused problems on some systems because
2233 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
2234 * the same ExtINT cascade interrupt to drive the local APIC of the
2235 * bootstrap processor. Therefore we refrain from routing IRQ2 to
2236 * the I/O APIC in all cases now. No actual device should request
2237 * it anyway. --macro
2238 */
2239#define PIC_IRQS (1UL << PIC_CASCADE_IR)
2240
2241static int mp_irqdomain_create(int ioapic)
2242{
2243 struct irq_alloc_info info;
2244 struct irq_domain *parent;
2245 int hwirqs = mp_ioapic_pin_count(ioapic);
2246 struct ioapic *ip = &ioapics[ioapic];
2247 struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg;
2248 struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
2249 struct fwnode_handle *fn;
2250 char *name = "IO-APIC";
2251
2252 if (cfg->type == IOAPIC_DOMAIN_INVALID)
2253 return 0;
2254
2255 init_irq_alloc_info(&info, NULL);
2256 info.type = X86_IRQ_ALLOC_TYPE_IOAPIC;
2257 info.ioapic_id = mpc_ioapic_id(ioapic);
2258 parent = irq_remapping_get_ir_irq_domain(&info);
2259 if (!parent)
2260 parent = x86_vector_domain;
2261 else
2262 name = "IO-APIC-IR";
2263
2264 /* Handle device tree enumerated APICs proper */
2265 if (cfg->dev) {
2266 fn = of_node_to_fwnode(cfg->dev);
2267 } else {
2268 fn = irq_domain_alloc_named_id_fwnode(name, ioapic);
2269 if (!fn)
2270 return -ENOMEM;
2271 }
2272
2273 ip->irqdomain = irq_domain_create_linear(fn, hwirqs, cfg->ops,
2274 (void *)(long)ioapic);
2275
2276 /* Release fw handle if it was allocated above */
2277 if (!cfg->dev)
2278 irq_domain_free_fwnode(fn);
2279
2280 if (!ip->irqdomain)
2281 return -ENOMEM;
2282
2283 ip->irqdomain->parent = parent;
2284
2285 if (cfg->type == IOAPIC_DOMAIN_LEGACY ||
2286 cfg->type == IOAPIC_DOMAIN_STRICT)
2287 ioapic_dynirq_base = max(ioapic_dynirq_base,
2288 gsi_cfg->gsi_end + 1);
2289
2290 return 0;
2291}
2292
2293static void ioapic_destroy_irqdomain(int idx)
2294{
2295 if (ioapics[idx].irqdomain) {
2296 irq_domain_remove(ioapics[idx].irqdomain);
2297 ioapics[idx].irqdomain = NULL;
2298 }
2299}
2300
2301void __init setup_IO_APIC(void)
2302{
2303 int ioapic;
2304
2305 if (skip_ioapic_setup || !nr_ioapics)
2306 return;
2307
2308 io_apic_irqs = nr_legacy_irqs() ? ~PIC_IRQS : ~0UL;
2309
2310 apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
2311 for_each_ioapic(ioapic)
2312 BUG_ON(mp_irqdomain_create(ioapic));
2313
2314 /*
2315 * Set up IO-APIC IRQ routing.
2316 */
2317 x86_init.mpparse.setup_ioapic_ids();
2318
2319 sync_Arb_IDs();
2320 setup_IO_APIC_irqs();
2321 init_IO_APIC_traps();
2322 if (nr_legacy_irqs())
2323 check_timer();
2324
2325 ioapic_initialized = 1;
2326}
2327
2328static void resume_ioapic_id(int ioapic_idx)
2329{
2330 unsigned long flags;
2331 union IO_APIC_reg_00 reg_00;
2332
2333 raw_spin_lock_irqsave(&ioapic_lock, flags);
2334 reg_00.raw = io_apic_read(ioapic_idx, 0);
2335 if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx)) {
2336 reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
2337 io_apic_write(ioapic_idx, 0, reg_00.raw);
2338 }
2339 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2340}
2341
2342static void ioapic_resume(void)
2343{
2344 int ioapic_idx;
2345
2346 for_each_ioapic_reverse(ioapic_idx)
2347 resume_ioapic_id(ioapic_idx);
2348
2349 restore_ioapic_entries();
2350}
2351
2352static struct syscore_ops ioapic_syscore_ops = {
2353 .suspend = save_ioapic_entries,
2354 .resume = ioapic_resume,
2355};
2356
2357static int __init ioapic_init_ops(void)
2358{
2359 register_syscore_ops(&ioapic_syscore_ops);
2360
2361 return 0;
2362}
2363
2364device_initcall(ioapic_init_ops);
2365
2366static int io_apic_get_redir_entries(int ioapic)
2367{
2368 union IO_APIC_reg_01 reg_01;
2369 unsigned long flags;
2370
2371 raw_spin_lock_irqsave(&ioapic_lock, flags);
2372 reg_01.raw = io_apic_read(ioapic, 1);
2373 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2374
2375 /* The register returns the maximum index redir index
2376 * supported, which is one less than the total number of redir
2377 * entries.
2378 */
2379 return reg_01.bits.entries + 1;
2380}
2381
2382unsigned int arch_dynirq_lower_bound(unsigned int from)
2383{
2384 /*
2385 * dmar_alloc_hwirq() may be called before setup_IO_APIC(), so use
2386 * gsi_top if ioapic_dynirq_base hasn't been initialized yet.
2387 */
2388 return ioapic_initialized ? ioapic_dynirq_base : gsi_top;
2389}
2390
2391#ifdef CONFIG_X86_32
2392static int io_apic_get_unique_id(int ioapic, int apic_id)
2393{
2394 union IO_APIC_reg_00 reg_00;
2395 static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
2396 physid_mask_t tmp;
2397 unsigned long flags;
2398 int i = 0;
2399
2400 /*
2401 * The P4 platform supports up to 256 APIC IDs on two separate APIC
2402 * buses (one for LAPICs, one for IOAPICs), where predecessors only
2403 * supports up to 16 on one shared APIC bus.
2404 *
2405 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
2406 * advantage of new APIC bus architecture.
2407 */
2408
2409 if (physids_empty(apic_id_map))
2410 apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);
2411
2412 raw_spin_lock_irqsave(&ioapic_lock, flags);
2413 reg_00.raw = io_apic_read(ioapic, 0);
2414 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2415
2416 if (apic_id >= get_physical_broadcast()) {
2417 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
2418 "%d\n", ioapic, apic_id, reg_00.bits.ID);
2419 apic_id = reg_00.bits.ID;
2420 }
2421
2422 /*
2423 * Every APIC in a system must have a unique ID or we get lots of nice
2424 * 'stuck on smp_invalidate_needed IPI wait' messages.
2425 */
2426 if (apic->check_apicid_used(&apic_id_map, apic_id)) {
2427
2428 for (i = 0; i < get_physical_broadcast(); i++) {
2429 if (!apic->check_apicid_used(&apic_id_map, i))
2430 break;
2431 }
2432
2433 if (i == get_physical_broadcast())
2434 panic("Max apic_id exceeded!\n");
2435
2436 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
2437 "trying %d\n", ioapic, apic_id, i);
2438
2439 apic_id = i;
2440 }
2441
2442 apic->apicid_to_cpu_present(apic_id, &tmp);
2443 physids_or(apic_id_map, apic_id_map, tmp);
2444
2445 if (reg_00.bits.ID != apic_id) {
2446 reg_00.bits.ID = apic_id;
2447
2448 raw_spin_lock_irqsave(&ioapic_lock, flags);
2449 io_apic_write(ioapic, 0, reg_00.raw);
2450 reg_00.raw = io_apic_read(ioapic, 0);
2451 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2452
2453 /* Sanity check */
2454 if (reg_00.bits.ID != apic_id) {
2455 pr_err("IOAPIC[%d]: Unable to change apic_id!\n",
2456 ioapic);
2457 return -1;
2458 }
2459 }
2460
2461 apic_printk(APIC_VERBOSE, KERN_INFO
2462 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
2463
2464 return apic_id;
2465}
2466
2467static u8 io_apic_unique_id(int idx, u8 id)
2468{
2469 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
2470 !APIC_XAPIC(boot_cpu_apic_version))
2471 return io_apic_get_unique_id(idx, id);
2472 else
2473 return id;
2474}
2475#else
2476static u8 io_apic_unique_id(int idx, u8 id)
2477{
2478 union IO_APIC_reg_00 reg_00;
2479 DECLARE_BITMAP(used, 256);
2480 unsigned long flags;
2481 u8 new_id;
2482 int i;
2483
2484 bitmap_zero(used, 256);
2485 for_each_ioapic(i)
2486 __set_bit(mpc_ioapic_id(i), used);
2487
2488 /* Hand out the requested id if available */
2489 if (!test_bit(id, used))
2490 return id;
2491
2492 /*
2493 * Read the current id from the ioapic and keep it if
2494 * available.
2495 */
2496 raw_spin_lock_irqsave(&ioapic_lock, flags);
2497 reg_00.raw = io_apic_read(idx, 0);
2498 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2499 new_id = reg_00.bits.ID;
2500 if (!test_bit(new_id, used)) {
2501 apic_printk(APIC_VERBOSE, KERN_INFO
2502 "IOAPIC[%d]: Using reg apic_id %d instead of %d\n",
2503 idx, new_id, id);
2504 return new_id;
2505 }
2506
2507 /*
2508 * Get the next free id and write it to the ioapic.
2509 */
2510 new_id = find_first_zero_bit(used, 256);
2511 reg_00.bits.ID = new_id;
2512 raw_spin_lock_irqsave(&ioapic_lock, flags);
2513 io_apic_write(idx, 0, reg_00.raw);
2514 reg_00.raw = io_apic_read(idx, 0);
2515 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2516 /* Sanity check */
2517 BUG_ON(reg_00.bits.ID != new_id);
2518
2519 return new_id;
2520}
2521#endif
2522
2523static int io_apic_get_version(int ioapic)
2524{
2525 union IO_APIC_reg_01 reg_01;
2526 unsigned long flags;
2527
2528 raw_spin_lock_irqsave(&ioapic_lock, flags);
2529 reg_01.raw = io_apic_read(ioapic, 1);
2530 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2531
2532 return reg_01.bits.version;
2533}
2534
2535int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
2536{
2537 int ioapic, pin, idx;
2538
2539 if (skip_ioapic_setup)
2540 return -1;
2541
2542 ioapic = mp_find_ioapic(gsi);
2543 if (ioapic < 0)
2544 return -1;
2545
2546 pin = mp_find_ioapic_pin(ioapic, gsi);
2547 if (pin < 0)
2548 return -1;
2549
2550 idx = find_irq_entry(ioapic, pin, mp_INT);
2551 if (idx < 0)
2552 return -1;
2553
2554 *trigger = irq_trigger(idx);
2555 *polarity = irq_polarity(idx);
2556 return 0;
2557}
2558
2559/*
2560 * This function updates target affinity of IOAPIC interrupts to include
2561 * the CPUs which came online during SMP bringup.
2562 */
2563#define IOAPIC_RESOURCE_NAME_SIZE 11
2564
2565static struct resource *ioapic_resources;
2566
2567static struct resource * __init ioapic_setup_resources(void)
2568{
2569 unsigned long n;
2570 struct resource *res;
2571 char *mem;
2572 int i;
2573
2574 if (nr_ioapics == 0)
2575 return NULL;
2576
2577 n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
2578 n *= nr_ioapics;
2579
2580 mem = alloc_bootmem(n);
2581 res = (void *)mem;
2582
2583 mem += sizeof(struct resource) * nr_ioapics;
2584
2585 for_each_ioapic(i) {
2586 res[i].name = mem;
2587 res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
2588 snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
2589 mem += IOAPIC_RESOURCE_NAME_SIZE;
2590 ioapics[i].iomem_res = &res[i];
2591 }
2592
2593 ioapic_resources = res;
2594
2595 return res;
2596}
2597
2598void __init io_apic_init_mappings(void)
2599{
2600 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
2601 struct resource *ioapic_res;
2602 int i;
2603
2604 ioapic_res = ioapic_setup_resources();
2605 for_each_ioapic(i) {
2606 if (smp_found_config) {
2607 ioapic_phys = mpc_ioapic_addr(i);
2608#ifdef CONFIG_X86_32
2609 if (!ioapic_phys) {
2610 printk(KERN_ERR
2611 "WARNING: bogus zero IO-APIC "
2612 "address found in MPTABLE, "
2613 "disabling IO/APIC support!\n");
2614 smp_found_config = 0;
2615 skip_ioapic_setup = 1;
2616 goto fake_ioapic_page;
2617 }
2618#endif
2619 } else {
2620#ifdef CONFIG_X86_32
2621fake_ioapic_page:
2622#endif
2623 ioapic_phys = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
2624 ioapic_phys = __pa(ioapic_phys);
2625 }
2626 set_fixmap_nocache(idx, ioapic_phys);
2627 apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n",
2628 __fix_to_virt(idx) + (ioapic_phys & ~PAGE_MASK),
2629 ioapic_phys);
2630 idx++;
2631
2632 ioapic_res->start = ioapic_phys;
2633 ioapic_res->end = ioapic_phys + IO_APIC_SLOT_SIZE - 1;
2634 ioapic_res++;
2635 }
2636}
2637
2638void __init ioapic_insert_resources(void)
2639{
2640 int i;
2641 struct resource *r = ioapic_resources;
2642
2643 if (!r) {
2644 if (nr_ioapics > 0)
2645 printk(KERN_ERR
2646 "IO APIC resources couldn't be allocated.\n");
2647 return;
2648 }
2649
2650 for_each_ioapic(i) {
2651 insert_resource(&iomem_resource, r);
2652 r++;
2653 }
2654}
2655
2656int mp_find_ioapic(u32 gsi)
2657{
2658 int i;
2659
2660 if (nr_ioapics == 0)
2661 return -1;
2662
2663 /* Find the IOAPIC that manages this GSI. */
2664 for_each_ioapic(i) {
2665 struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(i);
2666 if (gsi >= gsi_cfg->gsi_base && gsi <= gsi_cfg->gsi_end)
2667 return i;
2668 }
2669
2670 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
2671 return -1;
2672}
2673
2674int mp_find_ioapic_pin(int ioapic, u32 gsi)
2675{
2676 struct mp_ioapic_gsi *gsi_cfg;
2677
2678 if (WARN_ON(ioapic < 0))
2679 return -1;
2680
2681 gsi_cfg = mp_ioapic_gsi_routing(ioapic);
2682 if (WARN_ON(gsi > gsi_cfg->gsi_end))
2683 return -1;
2684
2685 return gsi - gsi_cfg->gsi_base;
2686}
2687
2688static int bad_ioapic_register(int idx)
2689{
2690 union IO_APIC_reg_00 reg_00;
2691 union IO_APIC_reg_01 reg_01;
2692 union IO_APIC_reg_02 reg_02;
2693
2694 reg_00.raw = io_apic_read(idx, 0);
2695 reg_01.raw = io_apic_read(idx, 1);
2696 reg_02.raw = io_apic_read(idx, 2);
2697
2698 if (reg_00.raw == -1 && reg_01.raw == -1 && reg_02.raw == -1) {
2699 pr_warn("I/O APIC 0x%x registers return all ones, skipping!\n",
2700 mpc_ioapic_addr(idx));
2701 return 1;
2702 }
2703
2704 return 0;
2705}
2706
2707static int find_free_ioapic_entry(void)
2708{
2709 int idx;
2710
2711 for (idx = 0; idx < MAX_IO_APICS; idx++)
2712 if (ioapics[idx].nr_registers == 0)
2713 return idx;
2714
2715 return MAX_IO_APICS;
2716}
2717
2718/**
2719 * mp_register_ioapic - Register an IOAPIC device
2720 * @id: hardware IOAPIC ID
2721 * @address: physical address of IOAPIC register area
2722 * @gsi_base: base of GSI associated with the IOAPIC
2723 * @cfg: configuration information for the IOAPIC
2724 */
2725int mp_register_ioapic(int id, u32 address, u32 gsi_base,
2726 struct ioapic_domain_cfg *cfg)
2727{
2728 bool hotplug = !!ioapic_initialized;
2729 struct mp_ioapic_gsi *gsi_cfg;
2730 int idx, ioapic, entries;
2731 u32 gsi_end;
2732
2733 if (!address) {
2734 pr_warn("Bogus (zero) I/O APIC address found, skipping!\n");
2735 return -EINVAL;
2736 }
2737 for_each_ioapic(ioapic)
2738 if (ioapics[ioapic].mp_config.apicaddr == address) {
2739 pr_warn("address 0x%x conflicts with IOAPIC%d\n",
2740 address, ioapic);
2741 return -EEXIST;
2742 }
2743
2744 idx = find_free_ioapic_entry();
2745 if (idx >= MAX_IO_APICS) {
2746 pr_warn("Max # of I/O APICs (%d) exceeded (found %d), skipping\n",
2747 MAX_IO_APICS, idx);
2748 return -ENOSPC;
2749 }
2750
2751 ioapics[idx].mp_config.type = MP_IOAPIC;
2752 ioapics[idx].mp_config.flags = MPC_APIC_USABLE;
2753 ioapics[idx].mp_config.apicaddr = address;
2754
2755 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
2756 if (bad_ioapic_register(idx)) {
2757 clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
2758 return -ENODEV;
2759 }
2760
2761 ioapics[idx].mp_config.apicid = io_apic_unique_id(idx, id);
2762 ioapics[idx].mp_config.apicver = io_apic_get_version(idx);
2763
2764 /*
2765 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
2766 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
2767 */
2768 entries = io_apic_get_redir_entries(idx);
2769 gsi_end = gsi_base + entries - 1;
2770 for_each_ioapic(ioapic) {
2771 gsi_cfg = mp_ioapic_gsi_routing(ioapic);
2772 if ((gsi_base >= gsi_cfg->gsi_base &&
2773 gsi_base <= gsi_cfg->gsi_end) ||
2774 (gsi_end >= gsi_cfg->gsi_base &&
2775 gsi_end <= gsi_cfg->gsi_end)) {
2776 pr_warn("GSI range [%u-%u] for new IOAPIC conflicts with GSI[%u-%u]\n",
2777 gsi_base, gsi_end,
2778 gsi_cfg->gsi_base, gsi_cfg->gsi_end);
2779 clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
2780 return -ENOSPC;
2781 }
2782 }
2783 gsi_cfg = mp_ioapic_gsi_routing(idx);
2784 gsi_cfg->gsi_base = gsi_base;
2785 gsi_cfg->gsi_end = gsi_end;
2786
2787 ioapics[idx].irqdomain = NULL;
2788 ioapics[idx].irqdomain_cfg = *cfg;
2789
2790 /*
2791 * If mp_register_ioapic() is called during early boot stage when
2792 * walking ACPI/SFI/DT tables, it's too early to create irqdomain,
2793 * we are still using bootmem allocator. So delay it to setup_IO_APIC().
2794 */
2795 if (hotplug) {
2796 if (mp_irqdomain_create(idx)) {
2797 clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
2798 return -ENOMEM;
2799 }
2800 alloc_ioapic_saved_registers(idx);
2801 }
2802
2803 if (gsi_cfg->gsi_end >= gsi_top)
2804 gsi_top = gsi_cfg->gsi_end + 1;
2805 if (nr_ioapics <= idx)
2806 nr_ioapics = idx + 1;
2807
2808 /* Set nr_registers to mark entry present */
2809 ioapics[idx].nr_registers = entries;
2810
2811 pr_info("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, GSI %d-%d\n",
2812 idx, mpc_ioapic_id(idx),
2813 mpc_ioapic_ver(idx), mpc_ioapic_addr(idx),
2814 gsi_cfg->gsi_base, gsi_cfg->gsi_end);
2815
2816 return 0;
2817}
2818
2819int mp_unregister_ioapic(u32 gsi_base)
2820{
2821 int ioapic, pin;
2822 int found = 0;
2823
2824 for_each_ioapic(ioapic)
2825 if (ioapics[ioapic].gsi_config.gsi_base == gsi_base) {
2826 found = 1;
2827 break;
2828 }
2829 if (!found) {
2830 pr_warn("can't find IOAPIC for GSI %d\n", gsi_base);
2831 return -ENODEV;
2832 }
2833
2834 for_each_pin(ioapic, pin) {
2835 u32 gsi = mp_pin_to_gsi(ioapic, pin);
2836 int irq = mp_map_gsi_to_irq(gsi, 0, NULL);
2837 struct mp_chip_data *data;
2838
2839 if (irq >= 0) {
2840 data = irq_get_chip_data(irq);
2841 if (data && data->count) {
2842 pr_warn("pin%d on IOAPIC%d is still in use.\n",
2843 pin, ioapic);
2844 return -EBUSY;
2845 }
2846 }
2847 }
2848
2849 /* Mark entry not present */
2850 ioapics[ioapic].nr_registers = 0;
2851 ioapic_destroy_irqdomain(ioapic);
2852 free_ioapic_saved_registers(ioapic);
2853 if (ioapics[ioapic].iomem_res)
2854 release_resource(ioapics[ioapic].iomem_res);
2855 clear_fixmap(FIX_IO_APIC_BASE_0 + ioapic);
2856 memset(&ioapics[ioapic], 0, sizeof(ioapics[ioapic]));
2857
2858 return 0;
2859}
2860
2861int mp_ioapic_registered(u32 gsi_base)
2862{
2863 int ioapic;
2864
2865 for_each_ioapic(ioapic)
2866 if (ioapics[ioapic].gsi_config.gsi_base == gsi_base)
2867 return 1;
2868
2869 return 0;
2870}
2871
2872static void mp_irqdomain_get_attr(u32 gsi, struct mp_chip_data *data,
2873 struct irq_alloc_info *info)
2874{
2875 if (info && info->ioapic_valid) {
2876 data->trigger = info->ioapic_trigger;
2877 data->polarity = info->ioapic_polarity;
2878 } else if (acpi_get_override_irq(gsi, &data->trigger,
2879 &data->polarity) < 0) {
2880 /* PCI interrupts are always active low level triggered. */
2881 data->trigger = IOAPIC_LEVEL;
2882 data->polarity = IOAPIC_POL_LOW;
2883 }
2884}
2885
2886static void mp_setup_entry(struct irq_cfg *cfg, struct mp_chip_data *data,
2887 struct IO_APIC_route_entry *entry)
2888{
2889 memset(entry, 0, sizeof(*entry));
2890 entry->delivery_mode = apic->irq_delivery_mode;
2891 entry->dest_mode = apic->irq_dest_mode;
2892 entry->dest = cfg->dest_apicid;
2893 entry->vector = cfg->vector;
2894 entry->trigger = data->trigger;
2895 entry->polarity = data->polarity;
2896 /*
2897 * Mask level triggered irqs. Edge triggered irqs are masked
2898 * by the irq core code in case they fire.
2899 */
2900 if (data->trigger == IOAPIC_LEVEL)
2901 entry->mask = IOAPIC_MASKED;
2902 else
2903 entry->mask = IOAPIC_UNMASKED;
2904}
2905
2906int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
2907 unsigned int nr_irqs, void *arg)
2908{
2909 int ret, ioapic, pin;
2910 struct irq_cfg *cfg;
2911 struct irq_data *irq_data;
2912 struct mp_chip_data *data;
2913 struct irq_alloc_info *info = arg;
2914 unsigned long flags;
2915
2916 if (!info || nr_irqs > 1)
2917 return -EINVAL;
2918 irq_data = irq_domain_get_irq_data(domain, virq);
2919 if (!irq_data)
2920 return -EINVAL;
2921
2922 ioapic = mp_irqdomain_ioapic_idx(domain);
2923 pin = info->ioapic_pin;
2924 if (irq_find_mapping(domain, (irq_hw_number_t)pin) > 0)
2925 return -EEXIST;
2926
2927 data = kzalloc(sizeof(*data), GFP_KERNEL);
2928 if (!data)
2929 return -ENOMEM;
2930
2931 info->ioapic_entry = &data->entry;
2932 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, info);
2933 if (ret < 0) {
2934 kfree(data);
2935 return ret;
2936 }
2937
2938 INIT_LIST_HEAD(&data->irq_2_pin);
2939 irq_data->hwirq = info->ioapic_pin;
2940 irq_data->chip = (domain->parent == x86_vector_domain) ?
2941 &ioapic_chip : &ioapic_ir_chip;
2942 irq_data->chip_data = data;
2943 mp_irqdomain_get_attr(mp_pin_to_gsi(ioapic, pin), data, info);
2944
2945 cfg = irqd_cfg(irq_data);
2946 add_pin_to_irq_node(data, ioapic_alloc_attr_node(info), ioapic, pin);
2947
2948 local_irq_save(flags);
2949 if (info->ioapic_entry)
2950 mp_setup_entry(cfg, data, info->ioapic_entry);
2951 mp_register_handler(virq, data->trigger);
2952 if (virq < nr_legacy_irqs())
2953 legacy_pic->mask(virq);
2954 local_irq_restore(flags);
2955
2956 apic_printk(APIC_VERBOSE, KERN_DEBUG
2957 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i Dest:%d)\n",
2958 ioapic, mpc_ioapic_id(ioapic), pin, cfg->vector,
2959 virq, data->trigger, data->polarity, cfg->dest_apicid);
2960
2961 return 0;
2962}
2963
2964void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq,
2965 unsigned int nr_irqs)
2966{
2967 struct irq_data *irq_data;
2968 struct mp_chip_data *data;
2969
2970 BUG_ON(nr_irqs != 1);
2971 irq_data = irq_domain_get_irq_data(domain, virq);
2972 if (irq_data && irq_data->chip_data) {
2973 data = irq_data->chip_data;
2974 __remove_pin_from_irq(data, mp_irqdomain_ioapic_idx(domain),
2975 (int)irq_data->hwirq);
2976 WARN_ON(!list_empty(&data->irq_2_pin));
2977 kfree(irq_data->chip_data);
2978 }
2979 irq_domain_free_irqs_top(domain, virq, nr_irqs);
2980}
2981
2982int mp_irqdomain_activate(struct irq_domain *domain,
2983 struct irq_data *irq_data, bool reserve)
2984{
2985 unsigned long flags;
2986
2987 raw_spin_lock_irqsave(&ioapic_lock, flags);
2988 ioapic_configure_entry(irq_data);
2989 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2990 return 0;
2991}
2992
2993void mp_irqdomain_deactivate(struct irq_domain *domain,
2994 struct irq_data *irq_data)
2995{
2996 /* It won't be called for IRQ with multiple IOAPIC pins associated */
2997 ioapic_mask_entry(mp_irqdomain_ioapic_idx(domain),
2998 (int)irq_data->hwirq);
2999}
3000
3001int mp_irqdomain_ioapic_idx(struct irq_domain *domain)
3002{
3003 return (int)(long)domain->host_data;
3004}
3005
3006const struct irq_domain_ops mp_ioapic_irqdomain_ops = {
3007 .alloc = mp_irqdomain_alloc,
3008 .free = mp_irqdomain_free,
3009 .activate = mp_irqdomain_activate,
3010 .deactivate = mp_irqdomain_deactivate,
3011};