2 * Intel IO-APIC support for multi-Pentium hosts.
4 * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
6 * Many thanks to Stig Venaas for trying out countless experimental
7 * patches and reporting/debugging problems patiently!
9 * (c) 1999, Multiple IO-APIC support, developed by
10 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
11 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
12 * further tested and cleaned up by Zach Brown <zab@redhat.com>
13 * and Ingo Molnar <mingo@redhat.com>
16 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
17 * thanks to Eric Gilmore
19 * for testing these extensively
20 * Paul Diefenbaugh : Added full ACPI support
24 #include <linux/interrupt.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/sched.h>
28 #include <linux/pci.h>
29 #include <linux/mc146818rtc.h>
30 #include <linux/compiler.h>
31 #include <linux/acpi.h>
32 #include <linux/module.h>
33 #include <linux/sysdev.h>
34 #include <linux/msi.h>
35 #include <linux/htirq.h>
36 #include <linux/freezer.h>
37 #include <linux/kthread.h>
38 #include <linux/jiffies.h> /* time_after() */
40 #include <acpi/acpi_bus.h>
42 #include <linux/bootmem.h>
43 #include <linux/dmar.h>
44 #include <linux/hpet.h>
51 #include <asm/proto.h>
54 #include <asm/timer.h>
55 #include <asm/i8259.h>
57 #include <asm/msidef.h>
58 #include <asm/hypertransport.h>
59 #include <asm/setup.h>
60 #include <asm/irq_remapping.h>
62 #include <asm/hw_irq.h>
66 #define __apicdebuginit(type) static type __init
67 #define for_each_irq_pin(entry, head) \
68 for (entry = head; entry; entry = entry->next)
71 * Is the SiS APIC rmw bug present ?
72 * -1 = don't know, 0 = no, 1 = yes
74 int sis_apic_bug = -1;
76 static DEFINE_RAW_SPINLOCK(ioapic_lock);
77 static DEFINE_RAW_SPINLOCK(vector_lock);
80 * # of IRQ routing registers
82 int nr_ioapic_registers[MAX_IO_APICS];
84 /* I/O APIC entries */
85 struct mpc_ioapic mp_ioapics[MAX_IO_APICS];
88 /* IO APIC gsi routing info */
89 struct mp_ioapic_gsi mp_gsi_routing[MAX_IO_APICS];
91 /* MP IRQ source entries */
92 struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
94 /* # of MP IRQ source entries */
98 static int nr_irqs_gsi = NR_IRQS_LEGACY;
100 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
101 int mp_bus_id_to_type[MAX_MP_BUSSES];
104 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
106 int skip_ioapic_setup;
108 void arch_disable_smp_support(void)
112 noioapicreroute = -1;
114 skip_ioapic_setup = 1;
117 static int __init parse_noapic(char *str)
119 /* disable IO-APIC */
120 arch_disable_smp_support();
123 early_param("noapic", parse_noapic);
125 struct irq_pin_list {
127 struct irq_pin_list *next;
130 static struct irq_pin_list *get_one_free_irq_2_pin(int node)
132 struct irq_pin_list *pin;
134 pin = kzalloc_node(sizeof(*pin), GFP_ATOMIC, node);
139 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
140 #ifdef CONFIG_SPARSE_IRQ
141 static struct irq_cfg irq_cfgx[NR_IRQS_LEGACY];
143 static struct irq_cfg irq_cfgx[NR_IRQS];
146 int __init arch_early_irq_init(void)
149 struct irq_desc *desc;
154 if (!legacy_pic->nr_legacy_irqs) {
160 count = ARRAY_SIZE(irq_cfgx);
161 node= cpu_to_node(boot_cpu_id);
163 for (i = 0; i < count; i++) {
164 desc = irq_to_desc(i);
165 desc->chip_data = &cfg[i];
166 zalloc_cpumask_var_node(&cfg[i].domain, GFP_NOWAIT, node);
167 zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_NOWAIT, node);
169 * For legacy IRQ's, start with assigning irq0 to irq15 to
170 * IRQ0_VECTOR to IRQ15_VECTOR on cpu 0.
172 if (i < legacy_pic->nr_legacy_irqs) {
173 cfg[i].vector = IRQ0_VECTOR + i;
174 cpumask_set_cpu(0, cfg[i].domain);
181 #ifdef CONFIG_SPARSE_IRQ
182 struct irq_cfg *irq_cfg(unsigned int irq)
184 struct irq_cfg *cfg = NULL;
185 struct irq_desc *desc;
187 desc = irq_to_desc(irq);
189 cfg = desc->chip_data;
194 static struct irq_cfg *get_one_free_irq_cfg(int node)
198 cfg = kzalloc_node(sizeof(*cfg), GFP_ATOMIC, node);
200 if (!zalloc_cpumask_var_node(&cfg->domain, GFP_ATOMIC, node)) {
203 } else if (!zalloc_cpumask_var_node(&cfg->old_domain,
205 free_cpumask_var(cfg->domain);
214 int arch_init_chip_data(struct irq_desc *desc, int node)
218 cfg = desc->chip_data;
220 desc->chip_data = get_one_free_irq_cfg(node);
221 if (!desc->chip_data) {
222 printk(KERN_ERR "can not alloc irq_cfg\n");
230 /* for move_irq_desc */
232 init_copy_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg, int node)
234 struct irq_pin_list *old_entry, *head, *tail, *entry;
236 cfg->irq_2_pin = NULL;
237 old_entry = old_cfg->irq_2_pin;
241 entry = get_one_free_irq_2_pin(node);
245 entry->apic = old_entry->apic;
246 entry->pin = old_entry->pin;
249 old_entry = old_entry->next;
251 entry = get_one_free_irq_2_pin(node);
259 /* still use the old one */
262 entry->apic = old_entry->apic;
263 entry->pin = old_entry->pin;
266 old_entry = old_entry->next;
270 cfg->irq_2_pin = head;
273 static void free_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg)
275 struct irq_pin_list *entry, *next;
277 if (old_cfg->irq_2_pin == cfg->irq_2_pin)
280 entry = old_cfg->irq_2_pin;
287 old_cfg->irq_2_pin = NULL;
290 void arch_init_copy_chip_data(struct irq_desc *old_desc,
291 struct irq_desc *desc, int node)
294 struct irq_cfg *old_cfg;
296 cfg = get_one_free_irq_cfg(node);
301 desc->chip_data = cfg;
303 old_cfg = old_desc->chip_data;
305 memcpy(cfg, old_cfg, sizeof(struct irq_cfg));
307 init_copy_irq_2_pin(old_cfg, cfg, node);
310 static void free_irq_cfg(struct irq_cfg *old_cfg)
315 void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc)
317 struct irq_cfg *old_cfg, *cfg;
319 old_cfg = old_desc->chip_data;
320 cfg = desc->chip_data;
326 free_irq_2_pin(old_cfg, cfg);
327 free_irq_cfg(old_cfg);
328 old_desc->chip_data = NULL;
331 /* end for move_irq_desc */
334 struct irq_cfg *irq_cfg(unsigned int irq)
336 return irq < nr_irqs ? irq_cfgx + irq : NULL;
343 unsigned int unused[3];
345 unsigned int unused2[11];
349 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
351 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
352 + (mp_ioapics[idx].apicaddr & ~PAGE_MASK);
355 static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
357 struct io_apic __iomem *io_apic = io_apic_base(apic);
358 writel(vector, &io_apic->eoi);
361 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
363 struct io_apic __iomem *io_apic = io_apic_base(apic);
364 writel(reg, &io_apic->index);
365 return readl(&io_apic->data);
368 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
370 struct io_apic __iomem *io_apic = io_apic_base(apic);
371 writel(reg, &io_apic->index);
372 writel(value, &io_apic->data);
376 * Re-write a value: to be used for read-modify-write
377 * cycles where the read already set up the index register.
379 * Older SiS APIC requires we rewrite the index register
381 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
383 struct io_apic __iomem *io_apic = io_apic_base(apic);
386 writel(reg, &io_apic->index);
387 writel(value, &io_apic->data);
390 static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
392 struct irq_pin_list *entry;
395 raw_spin_lock_irqsave(&ioapic_lock, flags);
396 for_each_irq_pin(entry, cfg->irq_2_pin) {
401 reg = io_apic_read(entry->apic, 0x10 + pin*2);
402 /* Is the remote IRR bit set? */
403 if (reg & IO_APIC_REDIR_REMOTE_IRR) {
404 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
408 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
414 struct { u32 w1, w2; };
415 struct IO_APIC_route_entry entry;
418 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
420 union entry_union eu;
422 raw_spin_lock_irqsave(&ioapic_lock, flags);
423 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
424 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
425 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
430 * When we write a new IO APIC routing entry, we need to write the high
431 * word first! If the mask bit in the low word is clear, we will enable
432 * the interrupt, and we need to make sure the entry is fully populated
433 * before that happens.
436 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
438 union entry_union eu = {{0, 0}};
441 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
442 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
445 void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
448 raw_spin_lock_irqsave(&ioapic_lock, flags);
449 __ioapic_write_entry(apic, pin, e);
450 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
454 * When we mask an IO APIC routing entry, we need to write the low
455 * word first, in order to set the mask bit before we change the
458 static void ioapic_mask_entry(int apic, int pin)
461 union entry_union eu = { .entry.mask = 1 };
463 raw_spin_lock_irqsave(&ioapic_lock, flags);
464 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
465 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
466 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
470 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
471 * shared ISA-space IRQs, so we have to support them. We are super
472 * fast in the common case, and fast for shared ISA-space IRQs.
475 add_pin_to_irq_node_nopanic(struct irq_cfg *cfg, int node, int apic, int pin)
477 struct irq_pin_list **last, *entry;
479 /* don't allow duplicates */
480 last = &cfg->irq_2_pin;
481 for_each_irq_pin(entry, cfg->irq_2_pin) {
482 if (entry->apic == apic && entry->pin == pin)
487 entry = get_one_free_irq_2_pin(node);
489 printk(KERN_ERR "can not alloc irq_pin_list (%d,%d,%d)\n",
500 static void add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
502 if (add_pin_to_irq_node_nopanic(cfg, node, apic, pin))
503 panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
507 * Reroute an IRQ to a different pin.
509 static void __init replace_pin_at_irq_node(struct irq_cfg *cfg, int node,
510 int oldapic, int oldpin,
511 int newapic, int newpin)
513 struct irq_pin_list *entry;
515 for_each_irq_pin(entry, cfg->irq_2_pin) {
516 if (entry->apic == oldapic && entry->pin == oldpin) {
517 entry->apic = newapic;
519 /* every one is different, right? */
524 /* old apic/pin didn't exist, so just add new ones */
525 add_pin_to_irq_node(cfg, node, newapic, newpin);
528 static void __io_apic_modify_irq(struct irq_pin_list *entry,
529 int mask_and, int mask_or,
530 void (*final)(struct irq_pin_list *entry))
532 unsigned int reg, pin;
535 reg = io_apic_read(entry->apic, 0x10 + pin * 2);
538 io_apic_modify(entry->apic, 0x10 + pin * 2, reg);
543 static void io_apic_modify_irq(struct irq_cfg *cfg,
544 int mask_and, int mask_or,
545 void (*final)(struct irq_pin_list *entry))
547 struct irq_pin_list *entry;
549 for_each_irq_pin(entry, cfg->irq_2_pin)
550 __io_apic_modify_irq(entry, mask_and, mask_or, final);
553 static void __mask_and_edge_IO_APIC_irq(struct irq_pin_list *entry)
555 __io_apic_modify_irq(entry, ~IO_APIC_REDIR_LEVEL_TRIGGER,
556 IO_APIC_REDIR_MASKED, NULL);
559 static void __unmask_and_level_IO_APIC_irq(struct irq_pin_list *entry)
561 __io_apic_modify_irq(entry, ~IO_APIC_REDIR_MASKED,
562 IO_APIC_REDIR_LEVEL_TRIGGER, NULL);
565 static void __unmask_IO_APIC_irq(struct irq_cfg *cfg)
567 io_apic_modify_irq(cfg, ~IO_APIC_REDIR_MASKED, 0, NULL);
570 static void io_apic_sync(struct irq_pin_list *entry)
573 * Synchronize the IO-APIC and the CPU by doing
574 * a dummy read from the IO-APIC
576 struct io_apic __iomem *io_apic;
577 io_apic = io_apic_base(entry->apic);
578 readl(&io_apic->data);
581 static void __mask_IO_APIC_irq(struct irq_cfg *cfg)
583 io_apic_modify_irq(cfg, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
586 static void mask_IO_APIC_irq_desc(struct irq_desc *desc)
588 struct irq_cfg *cfg = desc->chip_data;
593 raw_spin_lock_irqsave(&ioapic_lock, flags);
594 __mask_IO_APIC_irq(cfg);
595 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
598 static void unmask_IO_APIC_irq_desc(struct irq_desc *desc)
600 struct irq_cfg *cfg = desc->chip_data;
603 raw_spin_lock_irqsave(&ioapic_lock, flags);
604 __unmask_IO_APIC_irq(cfg);
605 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
608 static void mask_IO_APIC_irq(unsigned int irq)
610 struct irq_desc *desc = irq_to_desc(irq);
612 mask_IO_APIC_irq_desc(desc);
614 static void unmask_IO_APIC_irq(unsigned int irq)
616 struct irq_desc *desc = irq_to_desc(irq);
618 unmask_IO_APIC_irq_desc(desc);
621 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
623 struct IO_APIC_route_entry entry;
625 /* Check delivery_mode to be sure we're not clearing an SMI pin */
626 entry = ioapic_read_entry(apic, pin);
627 if (entry.delivery_mode == dest_SMI)
630 * Disable it in the IO-APIC irq-routing table:
632 ioapic_mask_entry(apic, pin);
635 static void clear_IO_APIC (void)
639 for (apic = 0; apic < nr_ioapics; apic++)
640 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
641 clear_IO_APIC_pin(apic, pin);
646 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
647 * specific CPU-side IRQs.
651 static int pirq_entries[MAX_PIRQS] = {
652 [0 ... MAX_PIRQS - 1] = -1
655 static int __init ioapic_pirq_setup(char *str)
658 int ints[MAX_PIRQS+1];
660 get_options(str, ARRAY_SIZE(ints), ints);
662 apic_printk(APIC_VERBOSE, KERN_INFO
663 "PIRQ redirection, working around broken MP-BIOS.\n");
665 if (ints[0] < MAX_PIRQS)
668 for (i = 0; i < max; i++) {
669 apic_printk(APIC_VERBOSE, KERN_DEBUG
670 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
672 * PIRQs are mapped upside down, usually.
674 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
679 __setup("pirq=", ioapic_pirq_setup);
680 #endif /* CONFIG_X86_32 */
682 struct IO_APIC_route_entry **alloc_ioapic_entries(void)
685 struct IO_APIC_route_entry **ioapic_entries;
687 ioapic_entries = kzalloc(sizeof(*ioapic_entries) * nr_ioapics,
692 for (apic = 0; apic < nr_ioapics; apic++) {
693 ioapic_entries[apic] =
694 kzalloc(sizeof(struct IO_APIC_route_entry) *
695 nr_ioapic_registers[apic], GFP_ATOMIC);
696 if (!ioapic_entries[apic])
700 return ioapic_entries;
704 kfree(ioapic_entries[apic]);
705 kfree(ioapic_entries);
711 * Saves all the IO-APIC RTE's
713 int save_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
720 for (apic = 0; apic < nr_ioapics; apic++) {
721 if (!ioapic_entries[apic])
724 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
725 ioapic_entries[apic][pin] =
726 ioapic_read_entry(apic, pin);
733 * Mask all IO APIC entries.
735 void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
742 for (apic = 0; apic < nr_ioapics; apic++) {
743 if (!ioapic_entries[apic])
746 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
747 struct IO_APIC_route_entry entry;
749 entry = ioapic_entries[apic][pin];
752 ioapic_write_entry(apic, pin, entry);
759 * Restore IO APIC entries which was saved in ioapic_entries.
761 int restore_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
768 for (apic = 0; apic < nr_ioapics; apic++) {
769 if (!ioapic_entries[apic])
772 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
773 ioapic_write_entry(apic, pin,
774 ioapic_entries[apic][pin]);
779 void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries)
783 for (apic = 0; apic < nr_ioapics; apic++)
784 kfree(ioapic_entries[apic]);
786 kfree(ioapic_entries);
790 * Find the IRQ entry number of a certain pin.
792 static int find_irq_entry(int apic, int pin, int type)
796 for (i = 0; i < mp_irq_entries; i++)
797 if (mp_irqs[i].irqtype == type &&
798 (mp_irqs[i].dstapic == mp_ioapics[apic].apicid ||
799 mp_irqs[i].dstapic == MP_APIC_ALL) &&
800 mp_irqs[i].dstirq == pin)
807 * Find the pin to which IRQ[irq] (ISA) is connected
809 static int __init find_isa_irq_pin(int irq, int type)
813 for (i = 0; i < mp_irq_entries; i++) {
814 int lbus = mp_irqs[i].srcbus;
816 if (test_bit(lbus, mp_bus_not_pci) &&
817 (mp_irqs[i].irqtype == type) &&
818 (mp_irqs[i].srcbusirq == irq))
820 return mp_irqs[i].dstirq;
825 static int __init find_isa_irq_apic(int irq, int type)
829 for (i = 0; i < mp_irq_entries; i++) {
830 int lbus = mp_irqs[i].srcbus;
832 if (test_bit(lbus, mp_bus_not_pci) &&
833 (mp_irqs[i].irqtype == type) &&
834 (mp_irqs[i].srcbusirq == irq))
837 if (i < mp_irq_entries) {
839 for(apic = 0; apic < nr_ioapics; apic++) {
840 if (mp_ioapics[apic].apicid == mp_irqs[i].dstapic)
848 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
850 * EISA Edge/Level control register, ELCR
852 static int EISA_ELCR(unsigned int irq)
854 if (irq < legacy_pic->nr_legacy_irqs) {
855 unsigned int port = 0x4d0 + (irq >> 3);
856 return (inb(port) >> (irq & 7)) & 1;
858 apic_printk(APIC_VERBOSE, KERN_INFO
859 "Broken MPtable reports ISA irq %d\n", irq);
865 /* ISA interrupts are always polarity zero edge triggered,
866 * when listed as conforming in the MP table. */
868 #define default_ISA_trigger(idx) (0)
869 #define default_ISA_polarity(idx) (0)
871 /* EISA interrupts are always polarity zero and can be edge or level
872 * trigger depending on the ELCR value. If an interrupt is listed as
873 * EISA conforming in the MP table, that means its trigger type must
874 * be read in from the ELCR */
876 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
877 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
879 /* PCI interrupts are always polarity one level triggered,
880 * when listed as conforming in the MP table. */
882 #define default_PCI_trigger(idx) (1)
883 #define default_PCI_polarity(idx) (1)
885 /* MCA interrupts are always polarity zero level triggered,
886 * when listed as conforming in the MP table. */
888 #define default_MCA_trigger(idx) (1)
889 #define default_MCA_polarity(idx) default_ISA_polarity(idx)
891 static int MPBIOS_polarity(int idx)
893 int bus = mp_irqs[idx].srcbus;
897 * Determine IRQ line polarity (high active or low active):
899 switch (mp_irqs[idx].irqflag & 3)
901 case 0: /* conforms, ie. bus-type dependent polarity */
902 if (test_bit(bus, mp_bus_not_pci))
903 polarity = default_ISA_polarity(idx);
905 polarity = default_PCI_polarity(idx);
907 case 1: /* high active */
912 case 2: /* reserved */
914 printk(KERN_WARNING "broken BIOS!!\n");
918 case 3: /* low active */
923 default: /* invalid */
925 printk(KERN_WARNING "broken BIOS!!\n");
933 static int MPBIOS_trigger(int idx)
935 int bus = mp_irqs[idx].srcbus;
939 * Determine IRQ trigger mode (edge or level sensitive):
941 switch ((mp_irqs[idx].irqflag>>2) & 3)
943 case 0: /* conforms, ie. bus-type dependent */
944 if (test_bit(bus, mp_bus_not_pci))
945 trigger = default_ISA_trigger(idx);
947 trigger = default_PCI_trigger(idx);
948 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
949 switch (mp_bus_id_to_type[bus]) {
950 case MP_BUS_ISA: /* ISA pin */
952 /* set before the switch */
955 case MP_BUS_EISA: /* EISA pin */
957 trigger = default_EISA_trigger(idx);
960 case MP_BUS_PCI: /* PCI pin */
962 /* set before the switch */
965 case MP_BUS_MCA: /* MCA pin */
967 trigger = default_MCA_trigger(idx);
972 printk(KERN_WARNING "broken BIOS!!\n");
984 case 2: /* reserved */
986 printk(KERN_WARNING "broken BIOS!!\n");
995 default: /* invalid */
997 printk(KERN_WARNING "broken BIOS!!\n");
1005 static inline int irq_polarity(int idx)
1007 return MPBIOS_polarity(idx);
1010 static inline int irq_trigger(int idx)
1012 return MPBIOS_trigger(idx);
1015 int (*ioapic_renumber_irq)(int ioapic, int irq);
1016 static int pin_2_irq(int idx, int apic, int pin)
1019 int bus = mp_irqs[idx].srcbus;
1022 * Debugging check, we are in big trouble if this message pops up!
1024 if (mp_irqs[idx].dstirq != pin)
1025 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
1027 if (test_bit(bus, mp_bus_not_pci)) {
1028 irq = mp_irqs[idx].srcbusirq;
1031 * PCI IRQs are mapped in order
1035 irq += nr_ioapic_registers[i++];
1038 * For MPS mode, so far only needed by ES7000 platform
1040 if (ioapic_renumber_irq)
1041 irq = ioapic_renumber_irq(apic, irq);
1044 #ifdef CONFIG_X86_32
1046 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1048 if ((pin >= 16) && (pin <= 23)) {
1049 if (pirq_entries[pin-16] != -1) {
1050 if (!pirq_entries[pin-16]) {
1051 apic_printk(APIC_VERBOSE, KERN_DEBUG
1052 "disabling PIRQ%d\n", pin-16);
1054 irq = pirq_entries[pin-16];
1055 apic_printk(APIC_VERBOSE, KERN_DEBUG
1056 "using PIRQ%d -> IRQ %d\n",
1067 * Find a specific PCI IRQ entry.
1068 * Not an __init, possibly needed by modules
1070 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
1071 struct io_apic_irq_attr *irq_attr)
1073 int apic, i, best_guess = -1;
1075 apic_printk(APIC_DEBUG,
1076 "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
1078 if (test_bit(bus, mp_bus_not_pci)) {
1079 apic_printk(APIC_VERBOSE,
1080 "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
1083 for (i = 0; i < mp_irq_entries; i++) {
1084 int lbus = mp_irqs[i].srcbus;
1086 for (apic = 0; apic < nr_ioapics; apic++)
1087 if (mp_ioapics[apic].apicid == mp_irqs[i].dstapic ||
1088 mp_irqs[i].dstapic == MP_APIC_ALL)
1091 if (!test_bit(lbus, mp_bus_not_pci) &&
1092 !mp_irqs[i].irqtype &&
1094 (slot == ((mp_irqs[i].srcbusirq >> 2) & 0x1f))) {
1095 int irq = pin_2_irq(i, apic, mp_irqs[i].dstirq);
1097 if (!(apic || IO_APIC_IRQ(irq)))
1100 if (pin == (mp_irqs[i].srcbusirq & 3)) {
1101 set_io_apic_irq_attr(irq_attr, apic,
1108 * Use the first all-but-pin matching entry as a
1109 * best-guess fuzzy result for broken mptables.
1111 if (best_guess < 0) {
1112 set_io_apic_irq_attr(irq_attr, apic,
1122 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
1124 void lock_vector_lock(void)
1126 /* Used to the online set of cpus does not change
1127 * during assign_irq_vector.
1129 raw_spin_lock(&vector_lock);
1132 void unlock_vector_lock(void)
1134 raw_spin_unlock(&vector_lock);
1138 __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
1141 * NOTE! The local APIC isn't very good at handling
1142 * multiple interrupts at the same interrupt level.
1143 * As the interrupt level is determined by taking the
1144 * vector number and shifting that right by 4, we
1145 * want to spread these out a bit so that they don't
1146 * all fall in the same interrupt level.
1148 * Also, we've got to be careful not to trash gate
1149 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1151 static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START;
1152 static int current_offset = VECTOR_OFFSET_START % 8;
1153 unsigned int old_vector;
1155 cpumask_var_t tmp_mask;
1157 if (cfg->move_in_progress)
1160 if (!alloc_cpumask_var(&tmp_mask, GFP_ATOMIC))
1163 old_vector = cfg->vector;
1165 cpumask_and(tmp_mask, mask, cpu_online_mask);
1166 cpumask_and(tmp_mask, cfg->domain, tmp_mask);
1167 if (!cpumask_empty(tmp_mask)) {
1168 free_cpumask_var(tmp_mask);
1173 /* Only try and allocate irqs on cpus that are present */
1175 for_each_cpu_and(cpu, mask, cpu_online_mask) {
1179 apic->vector_allocation_domain(cpu, tmp_mask);
1181 vector = current_vector;
1182 offset = current_offset;
1185 if (vector >= first_system_vector) {
1186 /* If out of vectors on large boxen, must share them. */
1187 offset = (offset + 1) % 8;
1188 vector = FIRST_EXTERNAL_VECTOR + offset;
1190 if (unlikely(current_vector == vector))
1193 if (test_bit(vector, used_vectors))
1196 for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
1197 if (per_cpu(vector_irq, new_cpu)[vector] != -1)
1200 current_vector = vector;
1201 current_offset = offset;
1203 cfg->move_in_progress = 1;
1204 cpumask_copy(cfg->old_domain, cfg->domain);
1206 for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
1207 per_cpu(vector_irq, new_cpu)[vector] = irq;
1208 cfg->vector = vector;
1209 cpumask_copy(cfg->domain, tmp_mask);
1213 free_cpumask_var(tmp_mask);
1217 int assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
1220 unsigned long flags;
1222 raw_spin_lock_irqsave(&vector_lock, flags);
1223 err = __assign_irq_vector(irq, cfg, mask);
1224 raw_spin_unlock_irqrestore(&vector_lock, flags);
1228 static void __clear_irq_vector(int irq, struct irq_cfg *cfg)
1232 BUG_ON(!cfg->vector);
1234 vector = cfg->vector;
1235 for_each_cpu_and(cpu, cfg->domain, cpu_online_mask)
1236 per_cpu(vector_irq, cpu)[vector] = -1;
1239 cpumask_clear(cfg->domain);
1241 if (likely(!cfg->move_in_progress))
1243 for_each_cpu_and(cpu, cfg->old_domain, cpu_online_mask) {
1244 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS;
1246 if (per_cpu(vector_irq, cpu)[vector] != irq)
1248 per_cpu(vector_irq, cpu)[vector] = -1;
1252 cfg->move_in_progress = 0;
1255 void __setup_vector_irq(int cpu)
1257 /* Initialize vector_irq on a new cpu */
1259 struct irq_cfg *cfg;
1260 struct irq_desc *desc;
1263 * vector_lock will make sure that we don't run into irq vector
1264 * assignments that might be happening on another cpu in parallel,
1265 * while we setup our initial vector to irq mappings.
1267 raw_spin_lock(&vector_lock);
1268 /* Mark the inuse vectors */
1269 for_each_irq_desc(irq, desc) {
1270 cfg = desc->chip_data;
1271 if (!cpumask_test_cpu(cpu, cfg->domain))
1273 vector = cfg->vector;
1274 per_cpu(vector_irq, cpu)[vector] = irq;
1276 /* Mark the free vectors */
1277 for (vector = 0; vector < NR_VECTORS; ++vector) {
1278 irq = per_cpu(vector_irq, cpu)[vector];
1283 if (!cpumask_test_cpu(cpu, cfg->domain))
1284 per_cpu(vector_irq, cpu)[vector] = -1;
1286 raw_spin_unlock(&vector_lock);
1289 static struct irq_chip ioapic_chip;
1290 static struct irq_chip ir_ioapic_chip;
1292 #define IOAPIC_AUTO -1
1293 #define IOAPIC_EDGE 0
1294 #define IOAPIC_LEVEL 1
1296 #ifdef CONFIG_X86_32
1297 static inline int IO_APIC_irq_trigger(int irq)
1301 for (apic = 0; apic < nr_ioapics; apic++) {
1302 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1303 idx = find_irq_entry(apic, pin, mp_INT);
1304 if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
1305 return irq_trigger(idx);
1309 * nonexistent IRQs are edge default
1314 static inline int IO_APIC_irq_trigger(int irq)
1320 static void ioapic_register_intr(int irq, struct irq_desc *desc, unsigned long trigger)
1323 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1324 trigger == IOAPIC_LEVEL)
1325 desc->status |= IRQ_LEVEL;
1327 desc->status &= ~IRQ_LEVEL;
1329 if (irq_remapped(irq)) {
1330 desc->status |= IRQ_MOVE_PCNTXT;
1332 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
1336 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
1337 handle_edge_irq, "edge");
1341 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1342 trigger == IOAPIC_LEVEL)
1343 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1347 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1348 handle_edge_irq, "edge");
1351 int setup_ioapic_entry(int apic_id, int irq,
1352 struct IO_APIC_route_entry *entry,
1353 unsigned int destination, int trigger,
1354 int polarity, int vector, int pin)
1357 * add it to the IO-APIC irq-routing table:
1359 memset(entry,0,sizeof(*entry));
1361 if (intr_remapping_enabled) {
1362 struct intel_iommu *iommu = map_ioapic_to_ir(apic_id);
1364 struct IR_IO_APIC_route_entry *ir_entry =
1365 (struct IR_IO_APIC_route_entry *) entry;
1369 panic("No mapping iommu for ioapic %d\n", apic_id);
1371 index = alloc_irte(iommu, irq, 1);
1373 panic("Failed to allocate IRTE for ioapic %d\n", apic_id);
1375 memset(&irte, 0, sizeof(irte));
1378 irte.dst_mode = apic->irq_dest_mode;
1380 * Trigger mode in the IRTE will always be edge, and the
1381 * actual level or edge trigger will be setup in the IO-APIC
1382 * RTE. This will help simplify level triggered irq migration.
1383 * For more details, see the comments above explainig IO-APIC
1384 * irq migration in the presence of interrupt-remapping.
1386 irte.trigger_mode = 0;
1387 irte.dlvry_mode = apic->irq_delivery_mode;
1388 irte.vector = vector;
1389 irte.dest_id = IRTE_DEST(destination);
1391 /* Set source-id of interrupt request */
1392 set_ioapic_sid(&irte, apic_id);
1394 modify_irte(irq, &irte);
1396 ir_entry->index2 = (index >> 15) & 0x1;
1398 ir_entry->format = 1;
1399 ir_entry->index = (index & 0x7fff);
1401 * IO-APIC RTE will be configured with virtual vector.
1402 * irq handler will do the explicit EOI to the io-apic.
1404 ir_entry->vector = pin;
1406 entry->delivery_mode = apic->irq_delivery_mode;
1407 entry->dest_mode = apic->irq_dest_mode;
1408 entry->dest = destination;
1409 entry->vector = vector;
1412 entry->mask = 0; /* enable IRQ */
1413 entry->trigger = trigger;
1414 entry->polarity = polarity;
1416 /* Mask level triggered irqs.
1417 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
1424 static void setup_IO_APIC_irq(int apic_id, int pin, unsigned int irq, struct irq_desc *desc,
1425 int trigger, int polarity)
1427 struct irq_cfg *cfg;
1428 struct IO_APIC_route_entry entry;
1431 if (!IO_APIC_IRQ(irq))
1434 cfg = desc->chip_data;
1437 * For legacy irqs, cfg->domain starts with cpu 0 for legacy
1438 * controllers like 8259. Now that IO-APIC can handle this irq, update
1441 if (irq < legacy_pic->nr_legacy_irqs && cpumask_test_cpu(0, cfg->domain))
1442 apic->vector_allocation_domain(0, cfg->domain);
1444 if (assign_irq_vector(irq, cfg, apic->target_cpus()))
1447 dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
1449 apic_printk(APIC_VERBOSE,KERN_DEBUG
1450 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
1451 "IRQ %d Mode:%i Active:%i)\n",
1452 apic_id, mp_ioapics[apic_id].apicid, pin, cfg->vector,
1453 irq, trigger, polarity);
1456 if (setup_ioapic_entry(mp_ioapics[apic_id].apicid, irq, &entry,
1457 dest, trigger, polarity, cfg->vector, pin)) {
1458 printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
1459 mp_ioapics[apic_id].apicid, pin);
1460 __clear_irq_vector(irq, cfg);
1464 ioapic_register_intr(irq, desc, trigger);
1465 if (irq < legacy_pic->nr_legacy_irqs)
1466 legacy_pic->chip->mask(irq);
1468 ioapic_write_entry(apic_id, pin, entry);
1472 DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
1473 } mp_ioapic_routing[MAX_IO_APICS];
1475 static void __init setup_IO_APIC_irqs(void)
1477 int apic_id = 0, pin, idx, irq;
1479 struct irq_desc *desc;
1480 struct irq_cfg *cfg;
1481 int node = cpu_to_node(boot_cpu_id);
1483 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1486 if (!acpi_disabled && acpi_ioapic) {
1487 apic_id = mp_find_ioapic(0);
1493 for (pin = 0; pin < nr_ioapic_registers[apic_id]; pin++) {
1494 idx = find_irq_entry(apic_id, pin, mp_INT);
1498 apic_printk(APIC_VERBOSE,
1499 KERN_DEBUG " %d-%d",
1500 mp_ioapics[apic_id].apicid, pin);
1502 apic_printk(APIC_VERBOSE, " %d-%d",
1503 mp_ioapics[apic_id].apicid, pin);
1507 apic_printk(APIC_VERBOSE,
1508 " (apicid-pin) not connected\n");
1512 irq = pin_2_irq(idx, apic_id, pin);
1515 * Skip the timer IRQ if there's a quirk handler
1516 * installed and if it returns 1:
1518 if (apic->multi_timer_check &&
1519 apic->multi_timer_check(apic_id, irq))
1522 desc = irq_to_desc_alloc_node(irq, node);
1524 printk(KERN_INFO "can not get irq_desc for %d\n", irq);
1527 cfg = desc->chip_data;
1528 add_pin_to_irq_node(cfg, node, apic_id, pin);
1530 * don't mark it in pin_programmed, so later acpi could
1531 * set it correctly when irq < 16
1533 setup_IO_APIC_irq(apic_id, pin, irq, desc,
1534 irq_trigger(idx), irq_polarity(idx));
1538 apic_printk(APIC_VERBOSE,
1539 " (apicid-pin) not connected\n");
1543 * for the gsit that is not in first ioapic
1544 * but could not use acpi_register_gsi()
1545 * like some special sci in IBM x3330
1547 void setup_IO_APIC_irq_extra(u32 gsi)
1549 int apic_id = 0, pin, idx, irq;
1550 int node = cpu_to_node(boot_cpu_id);
1551 struct irq_desc *desc;
1552 struct irq_cfg *cfg;
1555 * Convert 'gsi' to 'ioapic.pin'.
1557 apic_id = mp_find_ioapic(gsi);
1561 pin = mp_find_ioapic_pin(apic_id, gsi);
1562 idx = find_irq_entry(apic_id, pin, mp_INT);
1566 irq = pin_2_irq(idx, apic_id, pin);
1567 #ifdef CONFIG_SPARSE_IRQ
1568 desc = irq_to_desc(irq);
1572 desc = irq_to_desc_alloc_node(irq, node);
1574 printk(KERN_INFO "can not get irq_desc for %d\n", irq);
1578 cfg = desc->chip_data;
1579 add_pin_to_irq_node(cfg, node, apic_id, pin);
1581 if (test_bit(pin, mp_ioapic_routing[apic_id].pin_programmed)) {
1582 pr_debug("Pin %d-%d already programmed\n",
1583 mp_ioapics[apic_id].apicid, pin);
1586 set_bit(pin, mp_ioapic_routing[apic_id].pin_programmed);
1588 setup_IO_APIC_irq(apic_id, pin, irq, desc,
1589 irq_trigger(idx), irq_polarity(idx));
1593 * Set up the timer pin, possibly with the 8259A-master behind.
1595 static void __init setup_timer_IRQ0_pin(unsigned int apic_id, unsigned int pin,
1598 struct IO_APIC_route_entry entry;
1600 if (intr_remapping_enabled)
1603 memset(&entry, 0, sizeof(entry));
1606 * We use logical delivery to get the timer IRQ
1609 entry.dest_mode = apic->irq_dest_mode;
1610 entry.mask = 0; /* don't mask IRQ for edge */
1611 entry.dest = apic->cpu_mask_to_apicid(apic->target_cpus());
1612 entry.delivery_mode = apic->irq_delivery_mode;
1615 entry.vector = vector;
1618 * The timer IRQ doesn't have to know that behind the
1619 * scene we may have a 8259A-master in AEOI mode ...
1621 set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
1624 * Add it to the IO-APIC irq-routing table:
1626 ioapic_write_entry(apic_id, pin, entry);
1630 __apicdebuginit(void) print_IO_APIC(void)
1633 union IO_APIC_reg_00 reg_00;
1634 union IO_APIC_reg_01 reg_01;
1635 union IO_APIC_reg_02 reg_02;
1636 union IO_APIC_reg_03 reg_03;
1637 unsigned long flags;
1638 struct irq_cfg *cfg;
1639 struct irq_desc *desc;
1642 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1643 for (i = 0; i < nr_ioapics; i++)
1644 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1645 mp_ioapics[i].apicid, nr_ioapic_registers[i]);
1648 * We are a bit conservative about what we expect. We have to
1649 * know about every hardware change ASAP.
1651 printk(KERN_INFO "testing the IO APIC.......................\n");
1653 for (apic = 0; apic < nr_ioapics; apic++) {
1655 raw_spin_lock_irqsave(&ioapic_lock, flags);
1656 reg_00.raw = io_apic_read(apic, 0);
1657 reg_01.raw = io_apic_read(apic, 1);
1658 if (reg_01.bits.version >= 0x10)
1659 reg_02.raw = io_apic_read(apic, 2);
1660 if (reg_01.bits.version >= 0x20)
1661 reg_03.raw = io_apic_read(apic, 3);
1662 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1665 printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].apicid);
1666 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1667 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1668 printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
1669 printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
1671 printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
1672 printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
1674 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1675 printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
1678 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1679 * but the value of reg_02 is read as the previous read register
1680 * value, so ignore it if reg_02 == reg_01.
1682 if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1683 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1684 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1688 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1689 * or reg_03, but the value of reg_0[23] is read as the previous read
1690 * register value, so ignore it if reg_03 == reg_0[12].
1692 if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1693 reg_03.raw != reg_01.raw) {
1694 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1695 printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
1698 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1700 printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
1701 " Stat Dmod Deli Vect: \n");
1703 for (i = 0; i <= reg_01.bits.entries; i++) {
1704 struct IO_APIC_route_entry entry;
1706 entry = ioapic_read_entry(apic, i);
1708 printk(KERN_DEBUG " %02x %03X ",
1713 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1718 entry.delivery_status,
1720 entry.delivery_mode,
1725 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1726 for_each_irq_desc(irq, desc) {
1727 struct irq_pin_list *entry;
1729 cfg = desc->chip_data;
1730 entry = cfg->irq_2_pin;
1733 printk(KERN_DEBUG "IRQ%d ", irq);
1734 for_each_irq_pin(entry, cfg->irq_2_pin)
1735 printk("-> %d:%d", entry->apic, entry->pin);
1739 printk(KERN_INFO ".................................... done.\n");
1744 __apicdebuginit(void) print_APIC_field(int base)
1750 for (i = 0; i < 8; i++)
1751 printk(KERN_CONT "%08x", apic_read(base + i*0x10));
1753 printk(KERN_CONT "\n");
1756 __apicdebuginit(void) print_local_APIC(void *dummy)
1758 unsigned int i, v, ver, maxlvt;
1761 printk(KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1762 smp_processor_id(), hard_smp_processor_id());
1763 v = apic_read(APIC_ID);
1764 printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, read_apic_id());
1765 v = apic_read(APIC_LVR);
1766 printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1767 ver = GET_APIC_VERSION(v);
1768 maxlvt = lapic_get_maxlvt();
1770 v = apic_read(APIC_TASKPRI);
1771 printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1773 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1774 if (!APIC_XAPIC(ver)) {
1775 v = apic_read(APIC_ARBPRI);
1776 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1777 v & APIC_ARBPRI_MASK);
1779 v = apic_read(APIC_PROCPRI);
1780 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1784 * Remote read supported only in the 82489DX and local APIC for
1785 * Pentium processors.
1787 if (!APIC_INTEGRATED(ver) || maxlvt == 3) {
1788 v = apic_read(APIC_RRR);
1789 printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1792 v = apic_read(APIC_LDR);
1793 printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1794 if (!x2apic_enabled()) {
1795 v = apic_read(APIC_DFR);
1796 printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1798 v = apic_read(APIC_SPIV);
1799 printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1801 printk(KERN_DEBUG "... APIC ISR field:\n");
1802 print_APIC_field(APIC_ISR);
1803 printk(KERN_DEBUG "... APIC TMR field:\n");
1804 print_APIC_field(APIC_TMR);
1805 printk(KERN_DEBUG "... APIC IRR field:\n");
1806 print_APIC_field(APIC_IRR);
1808 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1809 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
1810 apic_write(APIC_ESR, 0);
1812 v = apic_read(APIC_ESR);
1813 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1816 icr = apic_icr_read();
1817 printk(KERN_DEBUG "... APIC ICR: %08x\n", (u32)icr);
1818 printk(KERN_DEBUG "... APIC ICR2: %08x\n", (u32)(icr >> 32));
1820 v = apic_read(APIC_LVTT);
1821 printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1823 if (maxlvt > 3) { /* PC is LVT#4. */
1824 v = apic_read(APIC_LVTPC);
1825 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1827 v = apic_read(APIC_LVT0);
1828 printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1829 v = apic_read(APIC_LVT1);
1830 printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1832 if (maxlvt > 2) { /* ERR is LVT#3. */
1833 v = apic_read(APIC_LVTERR);
1834 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1837 v = apic_read(APIC_TMICT);
1838 printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1839 v = apic_read(APIC_TMCCT);
1840 printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1841 v = apic_read(APIC_TDCR);
1842 printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1844 if (boot_cpu_has(X86_FEATURE_EXTAPIC)) {
1845 v = apic_read(APIC_EFEAT);
1846 maxlvt = (v >> 16) & 0xff;
1847 printk(KERN_DEBUG "... APIC EFEAT: %08x\n", v);
1848 v = apic_read(APIC_ECTRL);
1849 printk(KERN_DEBUG "... APIC ECTRL: %08x\n", v);
1850 for (i = 0; i < maxlvt; i++) {
1851 v = apic_read(APIC_EILVTn(i));
1852 printk(KERN_DEBUG "... APIC EILVT%d: %08x\n", i, v);
1858 __apicdebuginit(void) print_local_APICs(int maxcpu)
1866 for_each_online_cpu(cpu) {
1869 smp_call_function_single(cpu, print_local_APIC, NULL, 1);
1874 __apicdebuginit(void) print_PIC(void)
1877 unsigned long flags;
1879 if (!legacy_pic->nr_legacy_irqs)
1882 printk(KERN_DEBUG "\nprinting PIC contents\n");
1884 raw_spin_lock_irqsave(&i8259A_lock, flags);
1886 v = inb(0xa1) << 8 | inb(0x21);
1887 printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
1889 v = inb(0xa0) << 8 | inb(0x20);
1890 printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
1894 v = inb(0xa0) << 8 | inb(0x20);
1898 raw_spin_unlock_irqrestore(&i8259A_lock, flags);
1900 printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
1902 v = inb(0x4d1) << 8 | inb(0x4d0);
1903 printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1906 static int __initdata show_lapic = 1;
1907 static __init int setup_show_lapic(char *arg)
1911 if (strcmp(arg, "all") == 0) {
1912 show_lapic = CONFIG_NR_CPUS;
1914 get_option(&arg, &num);
1921 __setup("show_lapic=", setup_show_lapic);
1923 __apicdebuginit(int) print_ICs(void)
1925 if (apic_verbosity == APIC_QUIET)
1930 /* don't print out if apic is not there */
1931 if (!cpu_has_apic && !apic_from_smp_config())
1934 print_local_APICs(show_lapic);
1940 fs_initcall(print_ICs);
1943 /* Where if anywhere is the i8259 connect in external int mode */
1944 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
1946 void __init enable_IO_APIC(void)
1948 union IO_APIC_reg_01 reg_01;
1949 int i8259_apic, i8259_pin;
1951 unsigned long flags;
1954 * The number of IO-APIC IRQ registers (== #pins):
1956 for (apic = 0; apic < nr_ioapics; apic++) {
1957 raw_spin_lock_irqsave(&ioapic_lock, flags);
1958 reg_01.raw = io_apic_read(apic, 1);
1959 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1960 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1963 if (!legacy_pic->nr_legacy_irqs)
1966 for(apic = 0; apic < nr_ioapics; apic++) {
1968 /* See if any of the pins is in ExtINT mode */
1969 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1970 struct IO_APIC_route_entry entry;
1971 entry = ioapic_read_entry(apic, pin);
1973 /* If the interrupt line is enabled and in ExtInt mode
1974 * I have found the pin where the i8259 is connected.
1976 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1977 ioapic_i8259.apic = apic;
1978 ioapic_i8259.pin = pin;
1984 /* Look to see what if the MP table has reported the ExtINT */
1985 /* If we could not find the appropriate pin by looking at the ioapic
1986 * the i8259 probably is not connected the ioapic but give the
1987 * mptable a chance anyway.
1989 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1990 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1991 /* Trust the MP table if nothing is setup in the hardware */
1992 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1993 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1994 ioapic_i8259.pin = i8259_pin;
1995 ioapic_i8259.apic = i8259_apic;
1997 /* Complain if the MP table and the hardware disagree */
1998 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1999 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
2001 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
2005 * Do not trust the IO-APIC being empty at bootup
2011 * Not an __init, needed by the reboot code
2013 void disable_IO_APIC(void)
2016 * Clear the IO-APIC before rebooting:
2020 if (!legacy_pic->nr_legacy_irqs)
2024 * If the i8259 is routed through an IOAPIC
2025 * Put that IOAPIC in virtual wire mode
2026 * so legacy interrupts can be delivered.
2028 * With interrupt-remapping, for now we will use virtual wire A mode,
2029 * as virtual wire B is little complex (need to configure both
2030 * IOAPIC RTE aswell as interrupt-remapping table entry).
2031 * As this gets called during crash dump, keep this simple for now.
2033 if (ioapic_i8259.pin != -1 && !intr_remapping_enabled) {
2034 struct IO_APIC_route_entry entry;
2036 memset(&entry, 0, sizeof(entry));
2037 entry.mask = 0; /* Enabled */
2038 entry.trigger = 0; /* Edge */
2040 entry.polarity = 0; /* High */
2041 entry.delivery_status = 0;
2042 entry.dest_mode = 0; /* Physical */
2043 entry.delivery_mode = dest_ExtINT; /* ExtInt */
2045 entry.dest = read_apic_id();
2048 * Add it to the IO-APIC irq-routing table:
2050 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
2054 * Use virtual wire A mode when interrupt remapping is enabled.
2056 if (cpu_has_apic || apic_from_smp_config())
2057 disconnect_bsp_APIC(!intr_remapping_enabled &&
2058 ioapic_i8259.pin != -1);
2061 #ifdef CONFIG_X86_32
2063 * function to set the IO-APIC physical IDs based on the
2064 * values stored in the MPC table.
2066 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
2069 void __init setup_ioapic_ids_from_mpc(void)
2071 union IO_APIC_reg_00 reg_00;
2072 physid_mask_t phys_id_present_map;
2075 unsigned char old_id;
2076 unsigned long flags;
2081 * Don't check I/O APIC IDs for xAPIC systems. They have
2082 * no meaning without the serial APIC bus.
2084 if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
2085 || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
2088 * This is broken; anything with a real cpu count has to
2089 * circumvent this idiocy regardless.
2091 apic->ioapic_phys_id_map(&phys_cpu_present_map, &phys_id_present_map);
2094 * Set the IOAPIC ID to the value stored in the MPC table.
2096 for (apic_id = 0; apic_id < nr_ioapics; apic_id++) {
2098 /* Read the register 0 value */
2099 raw_spin_lock_irqsave(&ioapic_lock, flags);
2100 reg_00.raw = io_apic_read(apic_id, 0);
2101 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2103 old_id = mp_ioapics[apic_id].apicid;
2105 if (mp_ioapics[apic_id].apicid >= get_physical_broadcast()) {
2106 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
2107 apic_id, mp_ioapics[apic_id].apicid);
2108 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
2110 mp_ioapics[apic_id].apicid = reg_00.bits.ID;
2114 * Sanity check, is the ID really free? Every APIC in a
2115 * system must have a unique ID or we get lots of nice
2116 * 'stuck on smp_invalidate_needed IPI wait' messages.
2118 if (apic->check_apicid_used(&phys_id_present_map,
2119 mp_ioapics[apic_id].apicid)) {
2120 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
2121 apic_id, mp_ioapics[apic_id].apicid);
2122 for (i = 0; i < get_physical_broadcast(); i++)
2123 if (!physid_isset(i, phys_id_present_map))
2125 if (i >= get_physical_broadcast())
2126 panic("Max APIC ID exceeded!\n");
2127 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
2129 physid_set(i, phys_id_present_map);
2130 mp_ioapics[apic_id].apicid = i;
2133 apic->apicid_to_cpu_present(mp_ioapics[apic_id].apicid, &tmp);
2134 apic_printk(APIC_VERBOSE, "Setting %d in the "
2135 "phys_id_present_map\n",
2136 mp_ioapics[apic_id].apicid);
2137 physids_or(phys_id_present_map, phys_id_present_map, tmp);
2142 * We need to adjust the IRQ routing table
2143 * if the ID changed.
2145 if (old_id != mp_ioapics[apic_id].apicid)
2146 for (i = 0; i < mp_irq_entries; i++)
2147 if (mp_irqs[i].dstapic == old_id)
2149 = mp_ioapics[apic_id].apicid;
2152 * Read the right value from the MPC table and
2153 * write it into the ID register.
2155 apic_printk(APIC_VERBOSE, KERN_INFO
2156 "...changing IO-APIC physical APIC ID to %d ...",
2157 mp_ioapics[apic_id].apicid);
2159 reg_00.bits.ID = mp_ioapics[apic_id].apicid;
2160 raw_spin_lock_irqsave(&ioapic_lock, flags);
2161 io_apic_write(apic_id, 0, reg_00.raw);
2162 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2167 raw_spin_lock_irqsave(&ioapic_lock, flags);
2168 reg_00.raw = io_apic_read(apic_id, 0);
2169 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2170 if (reg_00.bits.ID != mp_ioapics[apic_id].apicid)
2171 printk("could not set ID!\n");
2173 apic_printk(APIC_VERBOSE, " ok.\n");
2178 int no_timer_check __initdata;
2180 static int __init notimercheck(char *s)
2185 __setup("no_timer_check", notimercheck);
2188 * There is a nasty bug in some older SMP boards, their mptable lies
2189 * about the timer IRQ. We do the following to work around the situation:
2191 * - timer IRQ defaults to IO-APIC IRQ
2192 * - if this function detects that timer IRQs are defunct, then we fall
2193 * back to ISA timer IRQs
2195 static int __init timer_irq_works(void)
2197 unsigned long t1 = jiffies;
2198 unsigned long flags;
2203 local_save_flags(flags);
2205 /* Let ten ticks pass... */
2206 mdelay((10 * 1000) / HZ);
2207 local_irq_restore(flags);
2210 * Expect a few ticks at least, to be sure some possible
2211 * glue logic does not lock up after one or two first
2212 * ticks in a non-ExtINT mode. Also the local APIC
2213 * might have cached one ExtINT interrupt. Finally, at
2214 * least one tick may be lost due to delays.
2218 if (time_after(jiffies, t1 + 4))
2224 * In the SMP+IOAPIC case it might happen that there are an unspecified
2225 * number of pending IRQ events unhandled. These cases are very rare,
2226 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
2227 * better to do it this way as thus we do not have to be aware of
2228 * 'pending' interrupts in the IRQ path, except at this point.
2231 * Edge triggered needs to resend any interrupt
2232 * that was delayed but this is now handled in the device
2237 * Starting up a edge-triggered IO-APIC interrupt is
2238 * nasty - we need to make sure that we get the edge.
2239 * If it is already asserted for some reason, we need
2240 * return 1 to indicate that is was pending.
2242 * This is not complete - we should be able to fake
2243 * an edge even if it isn't on the 8259A...
2246 static unsigned int startup_ioapic_irq(unsigned int irq)
2248 int was_pending = 0;
2249 unsigned long flags;
2250 struct irq_cfg *cfg;
2252 raw_spin_lock_irqsave(&ioapic_lock, flags);
2253 if (irq < legacy_pic->nr_legacy_irqs) {
2254 legacy_pic->chip->mask(irq);
2255 if (legacy_pic->irq_pending(irq))
2259 __unmask_IO_APIC_irq(cfg);
2260 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2265 static int ioapic_retrigger_irq(unsigned int irq)
2268 struct irq_cfg *cfg = irq_cfg(irq);
2269 unsigned long flags;
2271 raw_spin_lock_irqsave(&vector_lock, flags);
2272 apic->send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);
2273 raw_spin_unlock_irqrestore(&vector_lock, flags);
2279 * Level and edge triggered IO-APIC interrupts need different handling,
2280 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
2281 * handled with the level-triggered descriptor, but that one has slightly
2282 * more overhead. Level-triggered interrupts cannot be handled with the
2283 * edge-triggered handler, without risking IRQ storms and other ugly
2288 void send_cleanup_vector(struct irq_cfg *cfg)
2290 cpumask_var_t cleanup_mask;
2292 if (unlikely(!alloc_cpumask_var(&cleanup_mask, GFP_ATOMIC))) {
2294 for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
2295 apic->send_IPI_mask(cpumask_of(i), IRQ_MOVE_CLEANUP_VECTOR);
2297 cpumask_and(cleanup_mask, cfg->old_domain, cpu_online_mask);
2298 apic->send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
2299 free_cpumask_var(cleanup_mask);
2301 cfg->move_in_progress = 0;
2304 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, struct irq_cfg *cfg)
2307 struct irq_pin_list *entry;
2308 u8 vector = cfg->vector;
2310 for_each_irq_pin(entry, cfg->irq_2_pin) {
2316 * With interrupt-remapping, destination information comes
2317 * from interrupt-remapping table entry.
2319 if (!irq_remapped(irq))
2320 io_apic_write(apic, 0x11 + pin*2, dest);
2321 reg = io_apic_read(apic, 0x10 + pin*2);
2322 reg &= ~IO_APIC_REDIR_VECTOR_MASK;
2324 io_apic_modify(apic, 0x10 + pin*2, reg);
2329 * Either sets desc->affinity to a valid value, and returns
2330 * ->cpu_mask_to_apicid of that in dest_id, or returns -1 and
2331 * leaves desc->affinity untouched.
2334 set_desc_affinity(struct irq_desc *desc, const struct cpumask *mask,
2335 unsigned int *dest_id)
2337 struct irq_cfg *cfg;
2340 if (!cpumask_intersects(mask, cpu_online_mask))
2344 cfg = desc->chip_data;
2345 if (assign_irq_vector(irq, cfg, mask))
2348 cpumask_copy(desc->affinity, mask);
2350 *dest_id = apic->cpu_mask_to_apicid_and(desc->affinity, cfg->domain);
2355 set_ioapic_affinity_irq_desc(struct irq_desc *desc, const struct cpumask *mask)
2357 struct irq_cfg *cfg;
2358 unsigned long flags;
2364 cfg = desc->chip_data;
2366 raw_spin_lock_irqsave(&ioapic_lock, flags);
2367 ret = set_desc_affinity(desc, mask, &dest);
2369 /* Only the high 8 bits are valid. */
2370 dest = SET_APIC_LOGICAL_ID(dest);
2371 __target_IO_APIC_irq(irq, dest, cfg);
2373 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2379 set_ioapic_affinity_irq(unsigned int irq, const struct cpumask *mask)
2381 struct irq_desc *desc;
2383 desc = irq_to_desc(irq);
2385 return set_ioapic_affinity_irq_desc(desc, mask);
2388 #ifdef CONFIG_INTR_REMAP
2391 * Migrate the IO-APIC irq in the presence of intr-remapping.
2393 * For both level and edge triggered, irq migration is a simple atomic
2394 * update(of vector and cpu destination) of IRTE and flush the hardware cache.
2396 * For level triggered, we eliminate the io-apic RTE modification (with the
2397 * updated vector information), by using a virtual vector (io-apic pin number).
2398 * Real vector that is used for interrupting cpu will be coming from
2399 * the interrupt-remapping table entry.
2402 migrate_ioapic_irq_desc(struct irq_desc *desc, const struct cpumask *mask)
2404 struct irq_cfg *cfg;
2410 if (!cpumask_intersects(mask, cpu_online_mask))
2414 if (get_irte(irq, &irte))
2417 cfg = desc->chip_data;
2418 if (assign_irq_vector(irq, cfg, mask))
2421 dest = apic->cpu_mask_to_apicid_and(cfg->domain, mask);
2423 irte.vector = cfg->vector;
2424 irte.dest_id = IRTE_DEST(dest);
2427 * Modified the IRTE and flushes the Interrupt entry cache.
2429 modify_irte(irq, &irte);
2431 if (cfg->move_in_progress)
2432 send_cleanup_vector(cfg);
2434 cpumask_copy(desc->affinity, mask);
2440 * Migrates the IRQ destination in the process context.
2442 static int set_ir_ioapic_affinity_irq_desc(struct irq_desc *desc,
2443 const struct cpumask *mask)
2445 return migrate_ioapic_irq_desc(desc, mask);
2447 static int set_ir_ioapic_affinity_irq(unsigned int irq,
2448 const struct cpumask *mask)
2450 struct irq_desc *desc = irq_to_desc(irq);
2452 return set_ir_ioapic_affinity_irq_desc(desc, mask);
2455 static inline int set_ir_ioapic_affinity_irq_desc(struct irq_desc *desc,
2456 const struct cpumask *mask)
2462 asmlinkage void smp_irq_move_cleanup_interrupt(void)
2464 unsigned vector, me;
2470 me = smp_processor_id();
2471 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
2474 struct irq_desc *desc;
2475 struct irq_cfg *cfg;
2476 irq = __get_cpu_var(vector_irq)[vector];
2481 desc = irq_to_desc(irq);
2486 raw_spin_lock(&desc->lock);
2489 * Check if the irq migration is in progress. If so, we
2490 * haven't received the cleanup request yet for this irq.
2492 if (cfg->move_in_progress)
2495 if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
2498 irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
2500 * Check if the vector that needs to be cleanedup is
2501 * registered at the cpu's IRR. If so, then this is not
2502 * the best time to clean it up. Lets clean it up in the
2503 * next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR
2506 if (irr & (1 << (vector % 32))) {
2507 apic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR);
2510 __get_cpu_var(vector_irq)[vector] = -1;
2512 raw_spin_unlock(&desc->lock);
2518 static void __irq_complete_move(struct irq_desc **descp, unsigned vector)
2520 struct irq_desc *desc = *descp;
2521 struct irq_cfg *cfg = desc->chip_data;
2524 if (likely(!cfg->move_in_progress))
2527 me = smp_processor_id();
2529 if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
2530 send_cleanup_vector(cfg);
2533 static void irq_complete_move(struct irq_desc **descp)
2535 __irq_complete_move(descp, ~get_irq_regs()->orig_ax);
2538 void irq_force_complete_move(int irq)
2540 struct irq_desc *desc = irq_to_desc(irq);
2541 struct irq_cfg *cfg = desc->chip_data;
2543 __irq_complete_move(&desc, cfg->vector);
2546 static inline void irq_complete_move(struct irq_desc **descp) {}
2549 static void ack_apic_edge(unsigned int irq)
2551 struct irq_desc *desc = irq_to_desc(irq);
2553 irq_complete_move(&desc);
2554 move_native_irq(irq);
2558 atomic_t irq_mis_count;
2561 * IO-APIC versions below 0x20 don't support EOI register.
2562 * For the record, here is the information about various versions:
2564 * 1Xh I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
2565 * 2Xh I/O(x)APIC which is PCI 2.2 Compliant
2568 * Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
2569 * version as 0x2. This is an error with documentation and these ICH chips
2570 * use io-apic's of version 0x20.
2572 * For IO-APIC's with EOI register, we use that to do an explicit EOI.
2573 * Otherwise, we simulate the EOI message manually by changing the trigger
2574 * mode to edge and then back to level, with RTE being masked during this.
2576 static void __eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
2578 struct irq_pin_list *entry;
2580 for_each_irq_pin(entry, cfg->irq_2_pin) {
2581 if (mp_ioapics[entry->apic].apicver >= 0x20) {
2583 * Intr-remapping uses pin number as the virtual vector
2584 * in the RTE. Actual vector is programmed in
2585 * intr-remapping table entry. Hence for the io-apic
2586 * EOI we use the pin number.
2588 if (irq_remapped(irq))
2589 io_apic_eoi(entry->apic, entry->pin);
2591 io_apic_eoi(entry->apic, cfg->vector);
2593 __mask_and_edge_IO_APIC_irq(entry);
2594 __unmask_and_level_IO_APIC_irq(entry);
2599 static void eoi_ioapic_irq(struct irq_desc *desc)
2601 struct irq_cfg *cfg;
2602 unsigned long flags;
2606 cfg = desc->chip_data;
2608 raw_spin_lock_irqsave(&ioapic_lock, flags);
2609 __eoi_ioapic_irq(irq, cfg);
2610 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2613 static void ack_apic_level(unsigned int irq)
2615 struct irq_desc *desc = irq_to_desc(irq);
2618 struct irq_cfg *cfg;
2619 int do_unmask_irq = 0;
2621 irq_complete_move(&desc);
2622 #ifdef CONFIG_GENERIC_PENDING_IRQ
2623 /* If we are moving the irq we need to mask it */
2624 if (unlikely(desc->status & IRQ_MOVE_PENDING)) {
2626 mask_IO_APIC_irq_desc(desc);
2631 * It appears there is an erratum which affects at least version 0x11
2632 * of I/O APIC (that's the 82093AA and cores integrated into various
2633 * chipsets). Under certain conditions a level-triggered interrupt is
2634 * erroneously delivered as edge-triggered one but the respective IRR
2635 * bit gets set nevertheless. As a result the I/O unit expects an EOI
2636 * message but it will never arrive and further interrupts are blocked
2637 * from the source. The exact reason is so far unknown, but the
2638 * phenomenon was observed when two consecutive interrupt requests
2639 * from a given source get delivered to the same CPU and the source is
2640 * temporarily disabled in between.
2642 * A workaround is to simulate an EOI message manually. We achieve it
2643 * by setting the trigger mode to edge and then to level when the edge
2644 * trigger mode gets detected in the TMR of a local APIC for a
2645 * level-triggered interrupt. We mask the source for the time of the
2646 * operation to prevent an edge-triggered interrupt escaping meanwhile.
2647 * The idea is from Manfred Spraul. --macro
2649 * Also in the case when cpu goes offline, fixup_irqs() will forward
2650 * any unhandled interrupt on the offlined cpu to the new cpu
2651 * destination that is handling the corresponding interrupt. This
2652 * interrupt forwarding is done via IPI's. Hence, in this case also
2653 * level-triggered io-apic interrupt will be seen as an edge
2654 * interrupt in the IRR. And we can't rely on the cpu's EOI
2655 * to be broadcasted to the IO-APIC's which will clear the remoteIRR
2656 * corresponding to the level-triggered interrupt. Hence on IO-APIC's
2657 * supporting EOI register, we do an explicit EOI to clear the
2658 * remote IRR and on IO-APIC's which don't have an EOI register,
2659 * we use the above logic (mask+edge followed by unmask+level) from
2660 * Manfred Spraul to clear the remote IRR.
2662 cfg = desc->chip_data;
2664 v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
2667 * We must acknowledge the irq before we move it or the acknowledge will
2668 * not propagate properly.
2673 * Tail end of clearing remote IRR bit (either by delivering the EOI
2674 * message via io-apic EOI register write or simulating it using
2675 * mask+edge followed by unnask+level logic) manually when the
2676 * level triggered interrupt is seen as the edge triggered interrupt
2679 if (!(v & (1 << (i & 0x1f)))) {
2680 atomic_inc(&irq_mis_count);
2682 eoi_ioapic_irq(desc);
2685 /* Now we can move and renable the irq */
2686 if (unlikely(do_unmask_irq)) {
2687 /* Only migrate the irq if the ack has been received.
2689 * On rare occasions the broadcast level triggered ack gets
2690 * delayed going to ioapics, and if we reprogram the
2691 * vector while Remote IRR is still set the irq will never
2694 * To prevent this scenario we read the Remote IRR bit
2695 * of the ioapic. This has two effects.
2696 * - On any sane system the read of the ioapic will
2697 * flush writes (and acks) going to the ioapic from
2699 * - We get to see if the ACK has actually been delivered.
2701 * Based on failed experiments of reprogramming the
2702 * ioapic entry from outside of irq context starting
2703 * with masking the ioapic entry and then polling until
2704 * Remote IRR was clear before reprogramming the
2705 * ioapic I don't trust the Remote IRR bit to be
2706 * completey accurate.
2708 * However there appears to be no other way to plug
2709 * this race, so if the Remote IRR bit is not
2710 * accurate and is causing problems then it is a hardware bug
2711 * and you can go talk to the chipset vendor about it.
2713 cfg = desc->chip_data;
2714 if (!io_apic_level_ack_pending(cfg))
2715 move_masked_irq(irq);
2716 unmask_IO_APIC_irq_desc(desc);
2720 #ifdef CONFIG_INTR_REMAP
2721 static void ir_ack_apic_edge(unsigned int irq)
2726 static void ir_ack_apic_level(unsigned int irq)
2728 struct irq_desc *desc = irq_to_desc(irq);
2731 eoi_ioapic_irq(desc);
2733 #endif /* CONFIG_INTR_REMAP */
2735 static struct irq_chip ioapic_chip __read_mostly = {
2737 .startup = startup_ioapic_irq,
2738 .mask = mask_IO_APIC_irq,
2739 .unmask = unmask_IO_APIC_irq,
2740 .ack = ack_apic_edge,
2741 .eoi = ack_apic_level,
2743 .set_affinity = set_ioapic_affinity_irq,
2745 .retrigger = ioapic_retrigger_irq,
2748 static struct irq_chip ir_ioapic_chip __read_mostly = {
2749 .name = "IR-IO-APIC",
2750 .startup = startup_ioapic_irq,
2751 .mask = mask_IO_APIC_irq,
2752 .unmask = unmask_IO_APIC_irq,
2753 #ifdef CONFIG_INTR_REMAP
2754 .ack = ir_ack_apic_edge,
2755 .eoi = ir_ack_apic_level,
2757 .set_affinity = set_ir_ioapic_affinity_irq,
2760 .retrigger = ioapic_retrigger_irq,
2763 static inline void init_IO_APIC_traps(void)
2766 struct irq_desc *desc;
2767 struct irq_cfg *cfg;
2770 * NOTE! The local APIC isn't very good at handling
2771 * multiple interrupts at the same interrupt level.
2772 * As the interrupt level is determined by taking the
2773 * vector number and shifting that right by 4, we
2774 * want to spread these out a bit so that they don't
2775 * all fall in the same interrupt level.
2777 * Also, we've got to be careful not to trash gate
2778 * 0x80, because int 0x80 is hm, kind of importantish. ;)
2780 for_each_irq_desc(irq, desc) {
2781 cfg = desc->chip_data;
2782 if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
2784 * Hmm.. We don't have an entry for this,
2785 * so default to an old-fashioned 8259
2786 * interrupt if we can..
2788 if (irq < legacy_pic->nr_legacy_irqs)
2789 legacy_pic->make_irq(irq);
2791 /* Strange. Oh, well.. */
2792 desc->chip = &no_irq_chip;
2798 * The local APIC irq-chip implementation:
2801 static void mask_lapic_irq(unsigned int irq)
2805 v = apic_read(APIC_LVT0);
2806 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
2809 static void unmask_lapic_irq(unsigned int irq)
2813 v = apic_read(APIC_LVT0);
2814 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
2817 static void ack_lapic_irq(unsigned int irq)
2822 static struct irq_chip lapic_chip __read_mostly = {
2823 .name = "local-APIC",
2824 .mask = mask_lapic_irq,
2825 .unmask = unmask_lapic_irq,
2826 .ack = ack_lapic_irq,
2829 static void lapic_register_intr(int irq, struct irq_desc *desc)
2831 desc->status &= ~IRQ_LEVEL;
2832 set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
2836 static void __init setup_nmi(void)
2839 * Dirty trick to enable the NMI watchdog ...
2840 * We put the 8259A master into AEOI mode and
2841 * unmask on all local APICs LVT0 as NMI.
2843 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2844 * is from Maciej W. Rozycki - so we do not have to EOI from
2845 * the NMI handler or the timer interrupt.
2847 apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
2849 enable_NMI_through_LVT0();
2851 apic_printk(APIC_VERBOSE, " done.\n");
2855 * This looks a bit hackish but it's about the only one way of sending
2856 * a few INTA cycles to 8259As and any associated glue logic. ICR does
2857 * not support the ExtINT mode, unfortunately. We need to send these
2858 * cycles as some i82489DX-based boards have glue logic that keeps the
2859 * 8259A interrupt line asserted until INTA. --macro
2861 static inline void __init unlock_ExtINT_logic(void)
2864 struct IO_APIC_route_entry entry0, entry1;
2865 unsigned char save_control, save_freq_select;
2867 pin = find_isa_irq_pin(8, mp_INT);
2872 apic = find_isa_irq_apic(8, mp_INT);
2878 entry0 = ioapic_read_entry(apic, pin);
2879 clear_IO_APIC_pin(apic, pin);
2881 memset(&entry1, 0, sizeof(entry1));
2883 entry1.dest_mode = 0; /* physical delivery */
2884 entry1.mask = 0; /* unmask IRQ now */
2885 entry1.dest = hard_smp_processor_id();
2886 entry1.delivery_mode = dest_ExtINT;
2887 entry1.polarity = entry0.polarity;
2891 ioapic_write_entry(apic, pin, entry1);
2893 save_control = CMOS_READ(RTC_CONTROL);
2894 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2895 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2897 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2902 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2906 CMOS_WRITE(save_control, RTC_CONTROL);
2907 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2908 clear_IO_APIC_pin(apic, pin);
2910 ioapic_write_entry(apic, pin, entry0);
2913 static int disable_timer_pin_1 __initdata;
2914 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2915 static int __init disable_timer_pin_setup(char *arg)
2917 disable_timer_pin_1 = 1;
2920 early_param("disable_timer_pin_1", disable_timer_pin_setup);
2922 int timer_through_8259 __initdata;
2925 * This code may look a bit paranoid, but it's supposed to cooperate with
2926 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2927 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2928 * fanatically on his truly buggy board.
2930 * FIXME: really need to revamp this for all platforms.
2932 static inline void __init check_timer(void)
2934 struct irq_desc *desc = irq_to_desc(0);
2935 struct irq_cfg *cfg = desc->chip_data;
2936 int node = cpu_to_node(boot_cpu_id);
2937 int apic1, pin1, apic2, pin2;
2938 unsigned long flags;
2941 local_irq_save(flags);
2944 * get/set the timer IRQ vector:
2946 legacy_pic->chip->mask(0);
2947 assign_irq_vector(0, cfg, apic->target_cpus());
2950 * As IRQ0 is to be enabled in the 8259A, the virtual
2951 * wire has to be disabled in the local APIC. Also
2952 * timer interrupts need to be acknowledged manually in
2953 * the 8259A for the i82489DX when using the NMI
2954 * watchdog as that APIC treats NMIs as level-triggered.
2955 * The AEOI mode will finish them in the 8259A
2958 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2959 legacy_pic->init(1);
2960 #ifdef CONFIG_X86_32
2964 ver = apic_read(APIC_LVR);
2965 ver = GET_APIC_VERSION(ver);
2966 timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver));
2970 pin1 = find_isa_irq_pin(0, mp_INT);
2971 apic1 = find_isa_irq_apic(0, mp_INT);
2972 pin2 = ioapic_i8259.pin;
2973 apic2 = ioapic_i8259.apic;
2975 apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
2976 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2977 cfg->vector, apic1, pin1, apic2, pin2);
2980 * Some BIOS writers are clueless and report the ExtINTA
2981 * I/O APIC input from the cascaded 8259A as the timer
2982 * interrupt input. So just in case, if only one pin
2983 * was found above, try it both directly and through the
2987 if (intr_remapping_enabled)
2988 panic("BIOS bug: timer not connected to IO-APIC");
2992 } else if (pin2 == -1) {
2999 * Ok, does IRQ0 through the IOAPIC work?
3002 add_pin_to_irq_node(cfg, node, apic1, pin1);
3003 setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
3005 /* for edge trigger, setup_IO_APIC_irq already
3006 * leave it unmasked.
3007 * so only need to unmask if it is level-trigger
3008 * do we really have level trigger timer?
3011 idx = find_irq_entry(apic1, pin1, mp_INT);
3012 if (idx != -1 && irq_trigger(idx))
3013 unmask_IO_APIC_irq_desc(desc);
3015 if (timer_irq_works()) {
3016 if (nmi_watchdog == NMI_IO_APIC) {
3018 legacy_pic->chip->unmask(0);
3020 if (disable_timer_pin_1 > 0)
3021 clear_IO_APIC_pin(0, pin1);
3024 if (intr_remapping_enabled)
3025 panic("timer doesn't work through Interrupt-remapped IO-APIC");
3026 local_irq_disable();
3027 clear_IO_APIC_pin(apic1, pin1);
3029 apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
3030 "8254 timer not connected to IO-APIC\n");
3032 apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
3033 "(IRQ0) through the 8259A ...\n");
3034 apic_printk(APIC_QUIET, KERN_INFO
3035 "..... (found apic %d pin %d) ...\n", apic2, pin2);
3037 * legacy devices should be connected to IO APIC #0
3039 replace_pin_at_irq_node(cfg, node, apic1, pin1, apic2, pin2);
3040 setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
3041 legacy_pic->chip->unmask(0);
3042 if (timer_irq_works()) {
3043 apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
3044 timer_through_8259 = 1;
3045 if (nmi_watchdog == NMI_IO_APIC) {
3046 legacy_pic->chip->mask(0);
3048 legacy_pic->chip->unmask(0);
3053 * Cleanup, just in case ...
3055 local_irq_disable();
3056 legacy_pic->chip->mask(0);
3057 clear_IO_APIC_pin(apic2, pin2);
3058 apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
3061 if (nmi_watchdog == NMI_IO_APIC) {
3062 apic_printk(APIC_QUIET, KERN_WARNING "timer doesn't work "
3063 "through the IO-APIC - disabling NMI Watchdog!\n");
3064 nmi_watchdog = NMI_NONE;
3066 #ifdef CONFIG_X86_32
3070 apic_printk(APIC_QUIET, KERN_INFO
3071 "...trying to set up timer as Virtual Wire IRQ...\n");
3073 lapic_register_intr(0, desc);
3074 apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
3075 legacy_pic->chip->unmask(0);
3077 if (timer_irq_works()) {
3078 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
3081 local_irq_disable();
3082 legacy_pic->chip->mask(0);
3083 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
3084 apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
3086 apic_printk(APIC_QUIET, KERN_INFO
3087 "...trying to set up timer as ExtINT IRQ...\n");
3089 legacy_pic->init(0);
3090 legacy_pic->make_irq(0);
3091 apic_write(APIC_LVT0, APIC_DM_EXTINT);
3093 unlock_ExtINT_logic();
3095 if (timer_irq_works()) {
3096 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
3099 local_irq_disable();
3100 apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
3101 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
3102 "report. Then try booting with the 'noapic' option.\n");
3104 local_irq_restore(flags);
3108 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
3109 * to devices. However there may be an I/O APIC pin available for
3110 * this interrupt regardless. The pin may be left unconnected, but
3111 * typically it will be reused as an ExtINT cascade interrupt for
3112 * the master 8259A. In the MPS case such a pin will normally be
3113 * reported as an ExtINT interrupt in the MP table. With ACPI
3114 * there is no provision for ExtINT interrupts, and in the absence
3115 * of an override it would be treated as an ordinary ISA I/O APIC
3116 * interrupt, that is edge-triggered and unmasked by default. We
3117 * used to do this, but it caused problems on some systems because
3118 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
3119 * the same ExtINT cascade interrupt to drive the local APIC of the
3120 * bootstrap processor. Therefore we refrain from routing IRQ2 to
3121 * the I/O APIC in all cases now. No actual device should request
3122 * it anyway. --macro
3124 #define PIC_IRQS (1UL << PIC_CASCADE_IR)
3126 void __init setup_IO_APIC(void)
3130 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
3132 io_apic_irqs = legacy_pic->nr_legacy_irqs ? ~PIC_IRQS : ~0UL;
3134 apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
3136 * Set up IO-APIC IRQ routing.
3138 x86_init.mpparse.setup_ioapic_ids();
3141 setup_IO_APIC_irqs();
3142 init_IO_APIC_traps();
3143 if (legacy_pic->nr_legacy_irqs)
3148 * Called after all the initialization is done. If we didnt find any
3149 * APIC bugs then we can allow the modify fast path
3152 static int __init io_apic_bug_finalize(void)
3154 if (sis_apic_bug == -1)
3159 late_initcall(io_apic_bug_finalize);
3161 struct sysfs_ioapic_data {
3162 struct sys_device dev;
3163 struct IO_APIC_route_entry entry[0];
3165 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
3167 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
3169 struct IO_APIC_route_entry *entry;
3170 struct sysfs_ioapic_data *data;
3173 data = container_of(dev, struct sysfs_ioapic_data, dev);
3174 entry = data->entry;
3175 for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
3176 *entry = ioapic_read_entry(dev->id, i);
3181 static int ioapic_resume(struct sys_device *dev)
3183 struct IO_APIC_route_entry *entry;
3184 struct sysfs_ioapic_data *data;
3185 unsigned long flags;
3186 union IO_APIC_reg_00 reg_00;
3189 data = container_of(dev, struct sysfs_ioapic_data, dev);
3190 entry = data->entry;
3192 raw_spin_lock_irqsave(&ioapic_lock, flags);
3193 reg_00.raw = io_apic_read(dev->id, 0);
3194 if (reg_00.bits.ID != mp_ioapics[dev->id].apicid) {
3195 reg_00.bits.ID = mp_ioapics[dev->id].apicid;
3196 io_apic_write(dev->id, 0, reg_00.raw);
3198 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
3199 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
3200 ioapic_write_entry(dev->id, i, entry[i]);
3205 static struct sysdev_class ioapic_sysdev_class = {
3207 .suspend = ioapic_suspend,
3208 .resume = ioapic_resume,
3211 static int __init ioapic_init_sysfs(void)
3213 struct sys_device * dev;
3216 error = sysdev_class_register(&ioapic_sysdev_class);
3220 for (i = 0; i < nr_ioapics; i++ ) {
3221 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
3222 * sizeof(struct IO_APIC_route_entry);
3223 mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
3224 if (!mp_ioapic_data[i]) {
3225 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
3228 dev = &mp_ioapic_data[i]->dev;
3230 dev->cls = &ioapic_sysdev_class;
3231 error = sysdev_register(dev);
3233 kfree(mp_ioapic_data[i]);
3234 mp_ioapic_data[i] = NULL;
3235 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
3243 device_initcall(ioapic_init_sysfs);
3246 * Dynamic irq allocate and deallocation
3248 unsigned int create_irq_nr(unsigned int irq_want, int node)
3250 /* Allocate an unused irq */
3253 unsigned long flags;
3254 struct irq_cfg *cfg_new = NULL;
3255 struct irq_desc *desc_new = NULL;
3258 if (irq_want < nr_irqs_gsi)
3259 irq_want = nr_irqs_gsi;
3261 raw_spin_lock_irqsave(&vector_lock, flags);
3262 for (new = irq_want; new < nr_irqs; new++) {
3263 desc_new = irq_to_desc_alloc_node(new, node);
3265 printk(KERN_INFO "can not get irq_desc for %d\n", new);
3268 cfg_new = desc_new->chip_data;
3270 if (cfg_new->vector != 0)
3273 desc_new = move_irq_desc(desc_new, node);
3274 cfg_new = desc_new->chip_data;
3276 if (__assign_irq_vector(new, cfg_new, apic->target_cpus()) == 0)
3280 raw_spin_unlock_irqrestore(&vector_lock, flags);
3283 dynamic_irq_init_keep_chip_data(irq);
3288 int create_irq(void)
3290 int node = cpu_to_node(boot_cpu_id);
3291 unsigned int irq_want;
3294 irq_want = nr_irqs_gsi;
3295 irq = create_irq_nr(irq_want, node);
3303 void destroy_irq(unsigned int irq)
3305 unsigned long flags;
3307 dynamic_irq_cleanup_keep_chip_data(irq);
3310 raw_spin_lock_irqsave(&vector_lock, flags);
3311 __clear_irq_vector(irq, get_irq_chip_data(irq));
3312 raw_spin_unlock_irqrestore(&vector_lock, flags);
3316 * MSI message composition
3318 #ifdef CONFIG_PCI_MSI
3319 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
3320 struct msi_msg *msg, u8 hpet_id)
3322 struct irq_cfg *cfg;
3330 err = assign_irq_vector(irq, cfg, apic->target_cpus());
3334 dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
3336 if (irq_remapped(irq)) {
3341 ir_index = map_irq_to_irte_handle(irq, &sub_handle);
3342 BUG_ON(ir_index == -1);
3344 memset (&irte, 0, sizeof(irte));
3347 irte.dst_mode = apic->irq_dest_mode;
3348 irte.trigger_mode = 0; /* edge */
3349 irte.dlvry_mode = apic->irq_delivery_mode;
3350 irte.vector = cfg->vector;
3351 irte.dest_id = IRTE_DEST(dest);
3353 /* Set source-id of interrupt request */
3355 set_msi_sid(&irte, pdev);
3357 set_hpet_sid(&irte, hpet_id);
3359 modify_irte(irq, &irte);
3361 msg->address_hi = MSI_ADDR_BASE_HI;
3362 msg->data = sub_handle;
3363 msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
3365 MSI_ADDR_IR_INDEX1(ir_index) |
3366 MSI_ADDR_IR_INDEX2(ir_index);
3368 if (x2apic_enabled())
3369 msg->address_hi = MSI_ADDR_BASE_HI |
3370 MSI_ADDR_EXT_DEST_ID(dest);
3372 msg->address_hi = MSI_ADDR_BASE_HI;
3376 ((apic->irq_dest_mode == 0) ?
3377 MSI_ADDR_DEST_MODE_PHYSICAL:
3378 MSI_ADDR_DEST_MODE_LOGICAL) |
3379 ((apic->irq_delivery_mode != dest_LowestPrio) ?
3380 MSI_ADDR_REDIRECTION_CPU:
3381 MSI_ADDR_REDIRECTION_LOWPRI) |
3382 MSI_ADDR_DEST_ID(dest);
3385 MSI_DATA_TRIGGER_EDGE |
3386 MSI_DATA_LEVEL_ASSERT |
3387 ((apic->irq_delivery_mode != dest_LowestPrio) ?
3388 MSI_DATA_DELIVERY_FIXED:
3389 MSI_DATA_DELIVERY_LOWPRI) |
3390 MSI_DATA_VECTOR(cfg->vector);
3396 static int set_msi_irq_affinity(unsigned int irq, const struct cpumask *mask)
3398 struct irq_desc *desc = irq_to_desc(irq);
3399 struct irq_cfg *cfg;
3403 if (set_desc_affinity(desc, mask, &dest))
3406 cfg = desc->chip_data;
3408 read_msi_msg_desc(desc, &msg);
3410 msg.data &= ~MSI_DATA_VECTOR_MASK;
3411 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3412 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3413 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3415 write_msi_msg_desc(desc, &msg);
3419 #ifdef CONFIG_INTR_REMAP
3421 * Migrate the MSI irq to another cpumask. This migration is
3422 * done in the process context using interrupt-remapping hardware.
3425 ir_set_msi_irq_affinity(unsigned int irq, const struct cpumask *mask)
3427 struct irq_desc *desc = irq_to_desc(irq);
3428 struct irq_cfg *cfg = desc->chip_data;
3432 if (get_irte(irq, &irte))
3435 if (set_desc_affinity(desc, mask, &dest))
3438 irte.vector = cfg->vector;
3439 irte.dest_id = IRTE_DEST(dest);
3442 * atomically update the IRTE with the new destination and vector.
3444 modify_irte(irq, &irte);
3447 * After this point, all the interrupts will start arriving
3448 * at the new destination. So, time to cleanup the previous
3449 * vector allocation.
3451 if (cfg->move_in_progress)
3452 send_cleanup_vector(cfg);
3458 #endif /* CONFIG_SMP */
3461 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
3462 * which implement the MSI or MSI-X Capability Structure.
3464 static struct irq_chip msi_chip = {
3466 .unmask = unmask_msi_irq,
3467 .mask = mask_msi_irq,
3468 .ack = ack_apic_edge,
3470 .set_affinity = set_msi_irq_affinity,
3472 .retrigger = ioapic_retrigger_irq,
3475 static struct irq_chip msi_ir_chip = {
3476 .name = "IR-PCI-MSI",
3477 .unmask = unmask_msi_irq,
3478 .mask = mask_msi_irq,
3479 #ifdef CONFIG_INTR_REMAP
3480 .ack = ir_ack_apic_edge,
3482 .set_affinity = ir_set_msi_irq_affinity,
3485 .retrigger = ioapic_retrigger_irq,
3489 * Map the PCI dev to the corresponding remapping hardware unit
3490 * and allocate 'nvec' consecutive interrupt-remapping table entries
3493 static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
3495 struct intel_iommu *iommu;
3498 iommu = map_dev_to_ir(dev);
3501 "Unable to map PCI %s to iommu\n", pci_name(dev));
3505 index = alloc_irte(iommu, irq, nvec);
3508 "Unable to allocate %d IRTE for PCI %s\n", nvec,
3515 static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
3520 ret = msi_compose_msg(dev, irq, &msg, -1);
3524 set_irq_msi(irq, msidesc);
3525 write_msi_msg(irq, &msg);
3527 if (irq_remapped(irq)) {
3528 struct irq_desc *desc = irq_to_desc(irq);
3530 * irq migration in process context
3532 desc->status |= IRQ_MOVE_PCNTXT;
3533 set_irq_chip_and_handler_name(irq, &msi_ir_chip, handle_edge_irq, "edge");
3535 set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
3537 dev_printk(KERN_DEBUG, &dev->dev, "irq %d for MSI/MSI-X\n", irq);
3542 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
3545 int ret, sub_handle;
3546 struct msi_desc *msidesc;
3547 unsigned int irq_want;
3548 struct intel_iommu *iommu = NULL;
3552 /* x86 doesn't support multiple MSI yet */
3553 if (type == PCI_CAP_ID_MSI && nvec > 1)
3556 node = dev_to_node(&dev->dev);
3557 irq_want = nr_irqs_gsi;
3559 list_for_each_entry(msidesc, &dev->msi_list, list) {
3560 irq = create_irq_nr(irq_want, node);
3564 if (!intr_remapping_enabled)
3569 * allocate the consecutive block of IRTE's
3572 index = msi_alloc_irte(dev, irq, nvec);
3578 iommu = map_dev_to_ir(dev);
3584 * setup the mapping between the irq and the IRTE
3585 * base index, the sub_handle pointing to the
3586 * appropriate interrupt remap table entry.
3588 set_irte_irq(irq, iommu, index, sub_handle);
3591 ret = setup_msi_irq(dev, msidesc, irq);
3603 void arch_teardown_msi_irq(unsigned int irq)
3608 #if defined (CONFIG_DMAR) || defined (CONFIG_INTR_REMAP)
3610 static int dmar_msi_set_affinity(unsigned int irq, const struct cpumask *mask)
3612 struct irq_desc *desc = irq_to_desc(irq);
3613 struct irq_cfg *cfg;
3617 if (set_desc_affinity(desc, mask, &dest))
3620 cfg = desc->chip_data;
3622 dmar_msi_read(irq, &msg);
3624 msg.data &= ~MSI_DATA_VECTOR_MASK;
3625 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3626 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3627 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3629 dmar_msi_write(irq, &msg);
3634 #endif /* CONFIG_SMP */
3636 static struct irq_chip dmar_msi_type = {
3638 .unmask = dmar_msi_unmask,
3639 .mask = dmar_msi_mask,
3640 .ack = ack_apic_edge,
3642 .set_affinity = dmar_msi_set_affinity,
3644 .retrigger = ioapic_retrigger_irq,
3647 int arch_setup_dmar_msi(unsigned int irq)
3652 ret = msi_compose_msg(NULL, irq, &msg, -1);
3655 dmar_msi_write(irq, &msg);
3656 set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
3662 #ifdef CONFIG_HPET_TIMER
3665 static int hpet_msi_set_affinity(unsigned int irq, const struct cpumask *mask)
3667 struct irq_desc *desc = irq_to_desc(irq);
3668 struct irq_cfg *cfg;
3672 if (set_desc_affinity(desc, mask, &dest))
3675 cfg = desc->chip_data;
3677 hpet_msi_read(irq, &msg);
3679 msg.data &= ~MSI_DATA_VECTOR_MASK;
3680 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3681 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3682 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3684 hpet_msi_write(irq, &msg);
3689 #endif /* CONFIG_SMP */
3691 static struct irq_chip ir_hpet_msi_type = {
3692 .name = "IR-HPET_MSI",
3693 .unmask = hpet_msi_unmask,
3694 .mask = hpet_msi_mask,
3695 #ifdef CONFIG_INTR_REMAP
3696 .ack = ir_ack_apic_edge,
3698 .set_affinity = ir_set_msi_irq_affinity,
3701 .retrigger = ioapic_retrigger_irq,
3704 static struct irq_chip hpet_msi_type = {
3706 .unmask = hpet_msi_unmask,
3707 .mask = hpet_msi_mask,
3708 .ack = ack_apic_edge,
3710 .set_affinity = hpet_msi_set_affinity,
3712 .retrigger = ioapic_retrigger_irq,
3715 int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
3719 struct irq_desc *desc = irq_to_desc(irq);
3721 if (intr_remapping_enabled) {
3722 struct intel_iommu *iommu = map_hpet_to_ir(id);
3728 index = alloc_irte(iommu, irq, 1);
3733 ret = msi_compose_msg(NULL, irq, &msg, id);
3737 hpet_msi_write(irq, &msg);
3738 desc->status |= IRQ_MOVE_PCNTXT;
3739 if (irq_remapped(irq))
3740 set_irq_chip_and_handler_name(irq, &ir_hpet_msi_type,
3741 handle_edge_irq, "edge");
3743 set_irq_chip_and_handler_name(irq, &hpet_msi_type,
3744 handle_edge_irq, "edge");
3750 #endif /* CONFIG_PCI_MSI */
3752 * Hypertransport interrupt support
3754 #ifdef CONFIG_HT_IRQ
3758 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
3760 struct ht_irq_msg msg;
3761 fetch_ht_irq_msg(irq, &msg);
3763 msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
3764 msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
3766 msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
3767 msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
3769 write_ht_irq_msg(irq, &msg);
3772 static int set_ht_irq_affinity(unsigned int irq, const struct cpumask *mask)
3774 struct irq_desc *desc = irq_to_desc(irq);
3775 struct irq_cfg *cfg;
3778 if (set_desc_affinity(desc, mask, &dest))
3781 cfg = desc->chip_data;
3783 target_ht_irq(irq, dest, cfg->vector);
3790 static struct irq_chip ht_irq_chip = {
3792 .mask = mask_ht_irq,
3793 .unmask = unmask_ht_irq,
3794 .ack = ack_apic_edge,
3796 .set_affinity = set_ht_irq_affinity,
3798 .retrigger = ioapic_retrigger_irq,
3801 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
3803 struct irq_cfg *cfg;
3810 err = assign_irq_vector(irq, cfg, apic->target_cpus());
3812 struct ht_irq_msg msg;
3815 dest = apic->cpu_mask_to_apicid_and(cfg->domain,
3816 apic->target_cpus());
3818 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
3822 HT_IRQ_LOW_DEST_ID(dest) |
3823 HT_IRQ_LOW_VECTOR(cfg->vector) |
3824 ((apic->irq_dest_mode == 0) ?
3825 HT_IRQ_LOW_DM_PHYSICAL :
3826 HT_IRQ_LOW_DM_LOGICAL) |
3827 HT_IRQ_LOW_RQEOI_EDGE |
3828 ((apic->irq_delivery_mode != dest_LowestPrio) ?
3829 HT_IRQ_LOW_MT_FIXED :
3830 HT_IRQ_LOW_MT_ARBITRATED) |
3831 HT_IRQ_LOW_IRQ_MASKED;
3833 write_ht_irq_msg(irq, &msg);
3835 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
3836 handle_edge_irq, "edge");
3838 dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq);
3842 #endif /* CONFIG_HT_IRQ */
3844 int __init io_apic_get_redir_entries (int ioapic)
3846 union IO_APIC_reg_01 reg_01;
3847 unsigned long flags;
3849 raw_spin_lock_irqsave(&ioapic_lock, flags);
3850 reg_01.raw = io_apic_read(ioapic, 1);
3851 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
3853 return reg_01.bits.entries;
3856 void __init probe_nr_irqs_gsi(void)
3860 nr = acpi_probe_gsi();
3861 if (nr > nr_irqs_gsi) {
3864 /* for acpi=off or acpi is not compiled in */
3868 for (idx = 0; idx < nr_ioapics; idx++)
3869 nr += io_apic_get_redir_entries(idx) + 1;
3871 if (nr > nr_irqs_gsi)
3875 printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
3878 static int __io_apic_set_pci_routing(struct device *dev, int irq,
3879 struct io_apic_irq_attr *irq_attr)
3881 struct irq_desc *desc;
3882 struct irq_cfg *cfg;
3885 int trigger, polarity;
3887 ioapic = irq_attr->ioapic;
3888 if (!IO_APIC_IRQ(irq)) {
3889 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
3895 node = dev_to_node(dev);
3897 node = cpu_to_node(boot_cpu_id);
3899 desc = irq_to_desc_alloc_node(irq, node);
3901 printk(KERN_INFO "can not get irq_desc %d\n", irq);
3905 pin = irq_attr->ioapic_pin;
3906 trigger = irq_attr->trigger;
3907 polarity = irq_attr->polarity;
3910 * IRQs < 16 are already in the irq_2_pin[] map
3912 if (irq >= legacy_pic->nr_legacy_irqs) {
3913 cfg = desc->chip_data;
3914 if (add_pin_to_irq_node_nopanic(cfg, node, ioapic, pin)) {
3915 printk(KERN_INFO "can not add pin %d for irq %d\n",
3921 setup_IO_APIC_irq(ioapic, pin, irq, desc, trigger, polarity);
3926 int io_apic_set_pci_routing(struct device *dev, int irq,
3927 struct io_apic_irq_attr *irq_attr)
3931 * Avoid pin reprogramming. PRTs typically include entries
3932 * with redundant pin->gsi mappings (but unique PCI devices);
3933 * we only program the IOAPIC on the first.
3935 ioapic = irq_attr->ioapic;
3936 pin = irq_attr->ioapic_pin;
3937 if (test_bit(pin, mp_ioapic_routing[ioapic].pin_programmed)) {
3938 pr_debug("Pin %d-%d already programmed\n",
3939 mp_ioapics[ioapic].apicid, pin);
3942 set_bit(pin, mp_ioapic_routing[ioapic].pin_programmed);
3944 return __io_apic_set_pci_routing(dev, irq, irq_attr);
3947 u8 __init io_apic_unique_id(u8 id)
3949 #ifdef CONFIG_X86_32
3950 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
3951 !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
3952 return io_apic_get_unique_id(nr_ioapics, id);
3957 DECLARE_BITMAP(used, 256);
3959 bitmap_zero(used, 256);
3960 for (i = 0; i < nr_ioapics; i++) {
3961 struct mpc_ioapic *ia = &mp_ioapics[i];
3962 __set_bit(ia->apicid, used);
3964 if (!test_bit(id, used))
3966 return find_first_zero_bit(used, 256);
3970 #ifdef CONFIG_X86_32
3971 int __init io_apic_get_unique_id(int ioapic, int apic_id)
3973 union IO_APIC_reg_00 reg_00;
3974 static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
3976 unsigned long flags;
3980 * The P4 platform supports up to 256 APIC IDs on two separate APIC
3981 * buses (one for LAPICs, one for IOAPICs), where predecessors only
3982 * supports up to 16 on one shared APIC bus.
3984 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
3985 * advantage of new APIC bus architecture.
3988 if (physids_empty(apic_id_map))
3989 apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);
3991 raw_spin_lock_irqsave(&ioapic_lock, flags);
3992 reg_00.raw = io_apic_read(ioapic, 0);
3993 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
3995 if (apic_id >= get_physical_broadcast()) {
3996 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
3997 "%d\n", ioapic, apic_id, reg_00.bits.ID);
3998 apic_id = reg_00.bits.ID;
4002 * Every APIC in a system must have a unique ID or we get lots of nice
4003 * 'stuck on smp_invalidate_needed IPI wait' messages.
4005 if (apic->check_apicid_used(&apic_id_map, apic_id)) {
4007 for (i = 0; i < get_physical_broadcast(); i++) {
4008 if (!apic->check_apicid_used(&apic_id_map, i))
4012 if (i == get_physical_broadcast())
4013 panic("Max apic_id exceeded!\n");
4015 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
4016 "trying %d\n", ioapic, apic_id, i);
4021 apic->apicid_to_cpu_present(apic_id, &tmp);
4022 physids_or(apic_id_map, apic_id_map, tmp);
4024 if (reg_00.bits.ID != apic_id) {
4025 reg_00.bits.ID = apic_id;
4027 raw_spin_lock_irqsave(&ioapic_lock, flags);
4028 io_apic_write(ioapic, 0, reg_00.raw);
4029 reg_00.raw = io_apic_read(ioapic, 0);
4030 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
4033 if (reg_00.bits.ID != apic_id) {
4034 printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
4039 apic_printk(APIC_VERBOSE, KERN_INFO
4040 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
4046 int __init io_apic_get_version(int ioapic)
4048 union IO_APIC_reg_01 reg_01;
4049 unsigned long flags;
4051 raw_spin_lock_irqsave(&ioapic_lock, flags);
4052 reg_01.raw = io_apic_read(ioapic, 1);
4053 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
4055 return reg_01.bits.version;
4058 int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
4062 if (skip_ioapic_setup)
4065 for (i = 0; i < mp_irq_entries; i++)
4066 if (mp_irqs[i].irqtype == mp_INT &&
4067 mp_irqs[i].srcbusirq == bus_irq)
4069 if (i >= mp_irq_entries)
4072 *trigger = irq_trigger(i);
4073 *polarity = irq_polarity(i);
4078 * This function currently is only a helper for the i386 smp boot process where
4079 * we need to reprogram the ioredtbls to cater for the cpus which have come online
4080 * so mask in all cases should simply be apic->target_cpus()
4083 void __init setup_ioapic_dest(void)
4085 int pin, ioapic = 0, irq, irq_entry;
4086 struct irq_desc *desc;
4087 const struct cpumask *mask;
4089 if (skip_ioapic_setup == 1)
4093 if (!acpi_disabled && acpi_ioapic) {
4094 ioapic = mp_find_ioapic(0);
4100 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
4101 irq_entry = find_irq_entry(ioapic, pin, mp_INT);
4102 if (irq_entry == -1)
4104 irq = pin_2_irq(irq_entry, ioapic, pin);
4106 desc = irq_to_desc(irq);
4109 * Honour affinities which have been set in early boot
4112 (IRQ_NO_BALANCING | IRQ_AFFINITY_SET))
4113 mask = desc->affinity;
4115 mask = apic->target_cpus();
4117 if (intr_remapping_enabled)
4118 set_ir_ioapic_affinity_irq_desc(desc, mask);
4120 set_ioapic_affinity_irq_desc(desc, mask);
4126 #define IOAPIC_RESOURCE_NAME_SIZE 11
4128 static struct resource *ioapic_resources;
4130 static struct resource * __init ioapic_setup_resources(int nr_ioapics)
4133 struct resource *res;
4137 if (nr_ioapics <= 0)
4140 n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
4143 mem = alloc_bootmem(n);
4146 mem += sizeof(struct resource) * nr_ioapics;
4148 for (i = 0; i < nr_ioapics; i++) {
4150 res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
4151 snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
4152 mem += IOAPIC_RESOURCE_NAME_SIZE;
4155 ioapic_resources = res;
4160 void __init ioapic_init_mappings(void)
4162 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
4163 struct resource *ioapic_res;
4166 ioapic_res = ioapic_setup_resources(nr_ioapics);
4167 for (i = 0; i < nr_ioapics; i++) {
4168 if (smp_found_config) {
4169 ioapic_phys = mp_ioapics[i].apicaddr;
4170 #ifdef CONFIG_X86_32
4173 "WARNING: bogus zero IO-APIC "
4174 "address found in MPTABLE, "
4175 "disabling IO/APIC support!\n");
4176 smp_found_config = 0;
4177 skip_ioapic_setup = 1;
4178 goto fake_ioapic_page;
4182 #ifdef CONFIG_X86_32
4185 ioapic_phys = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
4186 ioapic_phys = __pa(ioapic_phys);
4188 set_fixmap_nocache(idx, ioapic_phys);
4189 apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n",
4190 __fix_to_virt(idx) + (ioapic_phys & ~PAGE_MASK),
4194 ioapic_res->start = ioapic_phys;
4195 ioapic_res->end = ioapic_phys + IO_APIC_SLOT_SIZE - 1;
4200 void __init ioapic_insert_resources(void)
4203 struct resource *r = ioapic_resources;
4208 "IO APIC resources couldn't be allocated.\n");
4212 for (i = 0; i < nr_ioapics; i++) {
4213 insert_resource(&iomem_resource, r);
4218 int mp_find_ioapic(int gsi)
4222 /* Find the IOAPIC that manages this GSI. */
4223 for (i = 0; i < nr_ioapics; i++) {
4224 if ((gsi >= mp_gsi_routing[i].gsi_base)
4225 && (gsi <= mp_gsi_routing[i].gsi_end))
4229 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
4233 int mp_find_ioapic_pin(int ioapic, int gsi)
4235 if (WARN_ON(ioapic == -1))
4237 if (WARN_ON(gsi > mp_gsi_routing[ioapic].gsi_end))
4240 return gsi - mp_gsi_routing[ioapic].gsi_base;
4243 static int bad_ioapic(unsigned long address)
4245 if (nr_ioapics >= MAX_IO_APICS) {
4246 printk(KERN_WARNING "WARING: Max # of I/O APICs (%d) exceeded "
4247 "(found %d), skipping\n", MAX_IO_APICS, nr_ioapics);
4251 printk(KERN_WARNING "WARNING: Bogus (zero) I/O APIC address"
4252 " found in table, skipping!\n");
4258 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
4262 if (bad_ioapic(address))
4267 mp_ioapics[idx].type = MP_IOAPIC;
4268 mp_ioapics[idx].flags = MPC_APIC_USABLE;
4269 mp_ioapics[idx].apicaddr = address;
4271 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
4272 mp_ioapics[idx].apicid = io_apic_unique_id(id);
4273 mp_ioapics[idx].apicver = io_apic_get_version(idx);
4276 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
4277 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
4279 mp_gsi_routing[idx].gsi_base = gsi_base;
4280 mp_gsi_routing[idx].gsi_end = gsi_base +
4281 io_apic_get_redir_entries(idx);
4283 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
4284 "GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
4285 mp_ioapics[idx].apicver, mp_ioapics[idx].apicaddr,
4286 mp_gsi_routing[idx].gsi_base, mp_gsi_routing[idx].gsi_end);
4291 /* Enable IOAPIC early just for system timer */
4292 void __init pre_init_apic_IRQ0(void)
4294 struct irq_cfg *cfg;
4295 struct irq_desc *desc;
4297 printk(KERN_INFO "Early APIC setup for system timer0\n");
4299 phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
4301 desc = irq_to_desc_alloc_node(0, 0);
4306 add_pin_to_irq_node(cfg, 0, 0, 0);
4307 set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
4309 setup_IO_APIC_irq(0, 0, 0, desc, 0, 0);