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() */
39 #include <linux/slab.h>
41 #include <acpi/acpi_bus.h>
43 #include <linux/bootmem.h>
44 #include <linux/dmar.h>
45 #include <linux/hpet.h>
52 #include <asm/proto.h>
55 #include <asm/timer.h>
56 #include <asm/i8259.h>
58 #include <asm/msidef.h>
59 #include <asm/hypertransport.h>
60 #include <asm/setup.h>
61 #include <asm/irq_remapping.h>
63 #include <asm/hw_irq.h>
67 #define __apicdebuginit(type) static type __init
68 #define for_each_irq_pin(entry, head) \
69 for (entry = head; entry; entry = entry->next)
72 * Is the SiS APIC rmw bug present ?
73 * -1 = don't know, 0 = no, 1 = yes
75 int sis_apic_bug = -1;
77 static DEFINE_RAW_SPINLOCK(ioapic_lock);
78 static DEFINE_RAW_SPINLOCK(vector_lock);
81 * # of IRQ routing registers
83 int nr_ioapic_registers[MAX_IO_APICS];
85 /* I/O APIC entries */
86 struct mpc_ioapic mp_ioapics[MAX_IO_APICS];
89 /* IO APIC gsi routing info */
90 struct mp_ioapic_gsi mp_gsi_routing[MAX_IO_APICS];
92 /* The one past the highest gsi number used */
95 /* MP IRQ source entries */
96 struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
98 /* # of MP IRQ source entries */
102 static int nr_irqs_gsi = NR_IRQS_LEGACY;
104 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
105 int mp_bus_id_to_type[MAX_MP_BUSSES];
108 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
110 int skip_ioapic_setup;
112 void arch_disable_smp_support(void)
116 noioapicreroute = -1;
118 skip_ioapic_setup = 1;
121 static int __init parse_noapic(char *str)
123 /* disable IO-APIC */
124 arch_disable_smp_support();
127 early_param("noapic", parse_noapic);
129 struct irq_pin_list {
131 struct irq_pin_list *next;
134 static struct irq_pin_list *get_one_free_irq_2_pin(int node)
136 struct irq_pin_list *pin;
138 pin = kzalloc_node(sizeof(*pin), GFP_ATOMIC, node);
143 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
144 #ifdef CONFIG_SPARSE_IRQ
145 static struct irq_cfg irq_cfgx[NR_IRQS_LEGACY];
147 static struct irq_cfg irq_cfgx[NR_IRQS];
150 int __init arch_early_irq_init(void)
153 struct irq_desc *desc;
158 if (!legacy_pic->nr_legacy_irqs) {
164 count = ARRAY_SIZE(irq_cfgx);
165 node = cpu_to_node(0);
167 for (i = 0; i < count; i++) {
168 desc = irq_to_desc(i);
169 desc->chip_data = &cfg[i];
170 zalloc_cpumask_var_node(&cfg[i].domain, GFP_NOWAIT, node);
171 zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_NOWAIT, node);
173 * For legacy IRQ's, start with assigning irq0 to irq15 to
174 * IRQ0_VECTOR to IRQ15_VECTOR on cpu 0.
176 if (i < legacy_pic->nr_legacy_irqs) {
177 cfg[i].vector = IRQ0_VECTOR + i;
178 cpumask_set_cpu(0, cfg[i].domain);
185 #ifdef CONFIG_SPARSE_IRQ
186 struct irq_cfg *irq_cfg(unsigned int irq)
188 struct irq_cfg *cfg = NULL;
189 struct irq_desc *desc;
191 desc = irq_to_desc(irq);
193 cfg = get_irq_desc_chip_data(desc);
198 static struct irq_cfg *get_one_free_irq_cfg(int node)
202 cfg = kzalloc_node(sizeof(*cfg), GFP_ATOMIC, node);
204 if (!zalloc_cpumask_var_node(&cfg->domain, GFP_ATOMIC, node)) {
207 } else if (!zalloc_cpumask_var_node(&cfg->old_domain,
209 free_cpumask_var(cfg->domain);
218 int arch_init_chip_data(struct irq_desc *desc, int node)
222 cfg = get_irq_desc_chip_data(desc);
224 cfg = get_one_free_irq_cfg(node);
225 desc->chip_data = cfg;
227 printk(KERN_ERR "can not alloc irq_cfg\n");
235 /* for move_irq_desc */
237 init_copy_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg, int node)
239 struct irq_pin_list *old_entry, *head, *tail, *entry;
241 cfg->irq_2_pin = NULL;
242 old_entry = old_cfg->irq_2_pin;
246 entry = get_one_free_irq_2_pin(node);
250 entry->apic = old_entry->apic;
251 entry->pin = old_entry->pin;
254 old_entry = old_entry->next;
256 entry = get_one_free_irq_2_pin(node);
264 /* still use the old one */
267 entry->apic = old_entry->apic;
268 entry->pin = old_entry->pin;
271 old_entry = old_entry->next;
275 cfg->irq_2_pin = head;
278 static void free_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg)
280 struct irq_pin_list *entry, *next;
282 if (old_cfg->irq_2_pin == cfg->irq_2_pin)
285 entry = old_cfg->irq_2_pin;
292 old_cfg->irq_2_pin = NULL;
295 void arch_init_copy_chip_data(struct irq_desc *old_desc,
296 struct irq_desc *desc, int node)
299 struct irq_cfg *old_cfg;
301 cfg = get_one_free_irq_cfg(node);
306 desc->chip_data = cfg;
308 old_cfg = old_desc->chip_data;
310 cfg->vector = old_cfg->vector;
311 cfg->move_in_progress = old_cfg->move_in_progress;
312 cpumask_copy(cfg->domain, old_cfg->domain);
313 cpumask_copy(cfg->old_domain, old_cfg->old_domain);
315 init_copy_irq_2_pin(old_cfg, cfg, node);
318 static void free_irq_cfg(struct irq_cfg *cfg)
320 free_cpumask_var(cfg->domain);
321 free_cpumask_var(cfg->old_domain);
325 void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc)
327 struct irq_cfg *old_cfg, *cfg;
329 old_cfg = get_irq_desc_chip_data(old_desc);
330 cfg = get_irq_desc_chip_data(desc);
336 free_irq_2_pin(old_cfg, cfg);
337 free_irq_cfg(old_cfg);
338 old_desc->chip_data = NULL;
341 /* end for move_irq_desc */
344 struct irq_cfg *irq_cfg(unsigned int irq)
346 return irq < nr_irqs ? irq_cfgx + irq : NULL;
353 unsigned int unused[3];
355 unsigned int unused2[11];
359 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
361 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
362 + (mp_ioapics[idx].apicaddr & ~PAGE_MASK);
365 static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
367 struct io_apic __iomem *io_apic = io_apic_base(apic);
368 writel(vector, &io_apic->eoi);
371 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
373 struct io_apic __iomem *io_apic = io_apic_base(apic);
374 writel(reg, &io_apic->index);
375 return readl(&io_apic->data);
378 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
380 struct io_apic __iomem *io_apic = io_apic_base(apic);
381 writel(reg, &io_apic->index);
382 writel(value, &io_apic->data);
386 * Re-write a value: to be used for read-modify-write
387 * cycles where the read already set up the index register.
389 * Older SiS APIC requires we rewrite the index register
391 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
393 struct io_apic __iomem *io_apic = io_apic_base(apic);
396 writel(reg, &io_apic->index);
397 writel(value, &io_apic->data);
400 static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
402 struct irq_pin_list *entry;
405 raw_spin_lock_irqsave(&ioapic_lock, flags);
406 for_each_irq_pin(entry, cfg->irq_2_pin) {
411 reg = io_apic_read(entry->apic, 0x10 + pin*2);
412 /* Is the remote IRR bit set? */
413 if (reg & IO_APIC_REDIR_REMOTE_IRR) {
414 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
418 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
424 struct { u32 w1, w2; };
425 struct IO_APIC_route_entry entry;
428 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
430 union entry_union eu;
432 raw_spin_lock_irqsave(&ioapic_lock, flags);
433 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
434 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
435 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
440 * When we write a new IO APIC routing entry, we need to write the high
441 * word first! If the mask bit in the low word is clear, we will enable
442 * the interrupt, and we need to make sure the entry is fully populated
443 * before that happens.
446 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
448 union entry_union eu = {{0, 0}};
451 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
452 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
455 void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
458 raw_spin_lock_irqsave(&ioapic_lock, flags);
459 __ioapic_write_entry(apic, pin, e);
460 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
464 * When we mask an IO APIC routing entry, we need to write the low
465 * word first, in order to set the mask bit before we change the
468 static void ioapic_mask_entry(int apic, int pin)
471 union entry_union eu = { .entry.mask = 1 };
473 raw_spin_lock_irqsave(&ioapic_lock, flags);
474 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
475 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
476 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
480 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
481 * shared ISA-space IRQs, so we have to support them. We are super
482 * fast in the common case, and fast for shared ISA-space IRQs.
485 add_pin_to_irq_node_nopanic(struct irq_cfg *cfg, int node, int apic, int pin)
487 struct irq_pin_list **last, *entry;
489 /* don't allow duplicates */
490 last = &cfg->irq_2_pin;
491 for_each_irq_pin(entry, cfg->irq_2_pin) {
492 if (entry->apic == apic && entry->pin == pin)
497 entry = get_one_free_irq_2_pin(node);
499 printk(KERN_ERR "can not alloc irq_pin_list (%d,%d,%d)\n",
510 static void add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
512 if (add_pin_to_irq_node_nopanic(cfg, node, apic, pin))
513 panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
517 * Reroute an IRQ to a different pin.
519 static void __init replace_pin_at_irq_node(struct irq_cfg *cfg, int node,
520 int oldapic, int oldpin,
521 int newapic, int newpin)
523 struct irq_pin_list *entry;
525 for_each_irq_pin(entry, cfg->irq_2_pin) {
526 if (entry->apic == oldapic && entry->pin == oldpin) {
527 entry->apic = newapic;
529 /* every one is different, right? */
534 /* old apic/pin didn't exist, so just add new ones */
535 add_pin_to_irq_node(cfg, node, newapic, newpin);
538 static void __io_apic_modify_irq(struct irq_pin_list *entry,
539 int mask_and, int mask_or,
540 void (*final)(struct irq_pin_list *entry))
542 unsigned int reg, pin;
545 reg = io_apic_read(entry->apic, 0x10 + pin * 2);
548 io_apic_modify(entry->apic, 0x10 + pin * 2, reg);
553 static void io_apic_modify_irq(struct irq_cfg *cfg,
554 int mask_and, int mask_or,
555 void (*final)(struct irq_pin_list *entry))
557 struct irq_pin_list *entry;
559 for_each_irq_pin(entry, cfg->irq_2_pin)
560 __io_apic_modify_irq(entry, mask_and, mask_or, final);
563 static void __mask_and_edge_IO_APIC_irq(struct irq_pin_list *entry)
565 __io_apic_modify_irq(entry, ~IO_APIC_REDIR_LEVEL_TRIGGER,
566 IO_APIC_REDIR_MASKED, NULL);
569 static void __unmask_and_level_IO_APIC_irq(struct irq_pin_list *entry)
571 __io_apic_modify_irq(entry, ~IO_APIC_REDIR_MASKED,
572 IO_APIC_REDIR_LEVEL_TRIGGER, NULL);
575 static void io_apic_sync(struct irq_pin_list *entry)
578 * Synchronize the IO-APIC and the CPU by doing
579 * a dummy read from the IO-APIC
581 struct io_apic __iomem *io_apic;
582 io_apic = io_apic_base(entry->apic);
583 readl(&io_apic->data);
586 static void mask_ioapic(struct irq_cfg *cfg)
590 raw_spin_lock_irqsave(&ioapic_lock, flags);
591 io_apic_modify_irq(cfg, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
592 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
595 static void mask_ioapic_irq(struct irq_data *data)
597 mask_ioapic(data->chip_data);
600 static void __unmask_ioapic(struct irq_cfg *cfg)
602 io_apic_modify_irq(cfg, ~IO_APIC_REDIR_MASKED, 0, NULL);
605 static void unmask_ioapic(struct irq_cfg *cfg)
609 raw_spin_lock_irqsave(&ioapic_lock, flags);
610 __unmask_ioapic(cfg);
611 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
614 static void unmask_ioapic_irq(struct irq_data *data)
616 unmask_ioapic(data->chip_data);
619 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
621 struct IO_APIC_route_entry entry;
623 /* Check delivery_mode to be sure we're not clearing an SMI pin */
624 entry = ioapic_read_entry(apic, pin);
625 if (entry.delivery_mode == dest_SMI)
628 * Disable it in the IO-APIC irq-routing table:
630 ioapic_mask_entry(apic, pin);
633 static void clear_IO_APIC (void)
637 for (apic = 0; apic < nr_ioapics; apic++)
638 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
639 clear_IO_APIC_pin(apic, pin);
644 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
645 * specific CPU-side IRQs.
649 static int pirq_entries[MAX_PIRQS] = {
650 [0 ... MAX_PIRQS - 1] = -1
653 static int __init ioapic_pirq_setup(char *str)
656 int ints[MAX_PIRQS+1];
658 get_options(str, ARRAY_SIZE(ints), ints);
660 apic_printk(APIC_VERBOSE, KERN_INFO
661 "PIRQ redirection, working around broken MP-BIOS.\n");
663 if (ints[0] < MAX_PIRQS)
666 for (i = 0; i < max; i++) {
667 apic_printk(APIC_VERBOSE, KERN_DEBUG
668 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
670 * PIRQs are mapped upside down, usually.
672 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
677 __setup("pirq=", ioapic_pirq_setup);
678 #endif /* CONFIG_X86_32 */
680 struct IO_APIC_route_entry **alloc_ioapic_entries(void)
683 struct IO_APIC_route_entry **ioapic_entries;
685 ioapic_entries = kzalloc(sizeof(*ioapic_entries) * nr_ioapics,
690 for (apic = 0; apic < nr_ioapics; apic++) {
691 ioapic_entries[apic] =
692 kzalloc(sizeof(struct IO_APIC_route_entry) *
693 nr_ioapic_registers[apic], GFP_ATOMIC);
694 if (!ioapic_entries[apic])
698 return ioapic_entries;
702 kfree(ioapic_entries[apic]);
703 kfree(ioapic_entries);
709 * Saves all the IO-APIC RTE's
711 int save_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
718 for (apic = 0; apic < nr_ioapics; apic++) {
719 if (!ioapic_entries[apic])
722 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
723 ioapic_entries[apic][pin] =
724 ioapic_read_entry(apic, pin);
731 * Mask all IO APIC entries.
733 void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
740 for (apic = 0; apic < nr_ioapics; apic++) {
741 if (!ioapic_entries[apic])
744 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
745 struct IO_APIC_route_entry entry;
747 entry = ioapic_entries[apic][pin];
750 ioapic_write_entry(apic, pin, entry);
757 * Restore IO APIC entries which was saved in ioapic_entries.
759 int restore_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
766 for (apic = 0; apic < nr_ioapics; apic++) {
767 if (!ioapic_entries[apic])
770 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
771 ioapic_write_entry(apic, pin,
772 ioapic_entries[apic][pin]);
777 void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries)
781 for (apic = 0; apic < nr_ioapics; apic++)
782 kfree(ioapic_entries[apic]);
784 kfree(ioapic_entries);
788 * Find the IRQ entry number of a certain pin.
790 static int find_irq_entry(int apic, int pin, int type)
794 for (i = 0; i < mp_irq_entries; i++)
795 if (mp_irqs[i].irqtype == type &&
796 (mp_irqs[i].dstapic == mp_ioapics[apic].apicid ||
797 mp_irqs[i].dstapic == MP_APIC_ALL) &&
798 mp_irqs[i].dstirq == pin)
805 * Find the pin to which IRQ[irq] (ISA) is connected
807 static int __init find_isa_irq_pin(int irq, int type)
811 for (i = 0; i < mp_irq_entries; i++) {
812 int lbus = mp_irqs[i].srcbus;
814 if (test_bit(lbus, mp_bus_not_pci) &&
815 (mp_irqs[i].irqtype == type) &&
816 (mp_irqs[i].srcbusirq == irq))
818 return mp_irqs[i].dstirq;
823 static int __init find_isa_irq_apic(int irq, int type)
827 for (i = 0; i < mp_irq_entries; i++) {
828 int lbus = mp_irqs[i].srcbus;
830 if (test_bit(lbus, mp_bus_not_pci) &&
831 (mp_irqs[i].irqtype == type) &&
832 (mp_irqs[i].srcbusirq == irq))
835 if (i < mp_irq_entries) {
837 for(apic = 0; apic < nr_ioapics; apic++) {
838 if (mp_ioapics[apic].apicid == mp_irqs[i].dstapic)
846 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
848 * EISA Edge/Level control register, ELCR
850 static int EISA_ELCR(unsigned int irq)
852 if (irq < legacy_pic->nr_legacy_irqs) {
853 unsigned int port = 0x4d0 + (irq >> 3);
854 return (inb(port) >> (irq & 7)) & 1;
856 apic_printk(APIC_VERBOSE, KERN_INFO
857 "Broken MPtable reports ISA irq %d\n", irq);
863 /* ISA interrupts are always polarity zero edge triggered,
864 * when listed as conforming in the MP table. */
866 #define default_ISA_trigger(idx) (0)
867 #define default_ISA_polarity(idx) (0)
869 /* EISA interrupts are always polarity zero and can be edge or level
870 * trigger depending on the ELCR value. If an interrupt is listed as
871 * EISA conforming in the MP table, that means its trigger type must
872 * be read in from the ELCR */
874 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
875 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
877 /* PCI interrupts are always polarity one level triggered,
878 * when listed as conforming in the MP table. */
880 #define default_PCI_trigger(idx) (1)
881 #define default_PCI_polarity(idx) (1)
883 /* MCA interrupts are always polarity zero level triggered,
884 * when listed as conforming in the MP table. */
886 #define default_MCA_trigger(idx) (1)
887 #define default_MCA_polarity(idx) default_ISA_polarity(idx)
889 static int MPBIOS_polarity(int idx)
891 int bus = mp_irqs[idx].srcbus;
895 * Determine IRQ line polarity (high active or low active):
897 switch (mp_irqs[idx].irqflag & 3)
899 case 0: /* conforms, ie. bus-type dependent polarity */
900 if (test_bit(bus, mp_bus_not_pci))
901 polarity = default_ISA_polarity(idx);
903 polarity = default_PCI_polarity(idx);
905 case 1: /* high active */
910 case 2: /* reserved */
912 printk(KERN_WARNING "broken BIOS!!\n");
916 case 3: /* low active */
921 default: /* invalid */
923 printk(KERN_WARNING "broken BIOS!!\n");
931 static int MPBIOS_trigger(int idx)
933 int bus = mp_irqs[idx].srcbus;
937 * Determine IRQ trigger mode (edge or level sensitive):
939 switch ((mp_irqs[idx].irqflag>>2) & 3)
941 case 0: /* conforms, ie. bus-type dependent */
942 if (test_bit(bus, mp_bus_not_pci))
943 trigger = default_ISA_trigger(idx);
945 trigger = default_PCI_trigger(idx);
946 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
947 switch (mp_bus_id_to_type[bus]) {
948 case MP_BUS_ISA: /* ISA pin */
950 /* set before the switch */
953 case MP_BUS_EISA: /* EISA pin */
955 trigger = default_EISA_trigger(idx);
958 case MP_BUS_PCI: /* PCI pin */
960 /* set before the switch */
963 case MP_BUS_MCA: /* MCA pin */
965 trigger = default_MCA_trigger(idx);
970 printk(KERN_WARNING "broken BIOS!!\n");
982 case 2: /* reserved */
984 printk(KERN_WARNING "broken BIOS!!\n");
993 default: /* invalid */
995 printk(KERN_WARNING "broken BIOS!!\n");
1003 static inline int irq_polarity(int idx)
1005 return MPBIOS_polarity(idx);
1008 static inline int irq_trigger(int idx)
1010 return MPBIOS_trigger(idx);
1013 static int pin_2_irq(int idx, int apic, int pin)
1016 int bus = mp_irqs[idx].srcbus;
1019 * Debugging check, we are in big trouble if this message pops up!
1021 if (mp_irqs[idx].dstirq != pin)
1022 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
1024 if (test_bit(bus, mp_bus_not_pci)) {
1025 irq = mp_irqs[idx].srcbusirq;
1027 u32 gsi = mp_gsi_routing[apic].gsi_base + pin;
1029 if (gsi >= NR_IRQS_LEGACY)
1032 irq = gsi_top + gsi;
1035 #ifdef CONFIG_X86_32
1037 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1039 if ((pin >= 16) && (pin <= 23)) {
1040 if (pirq_entries[pin-16] != -1) {
1041 if (!pirq_entries[pin-16]) {
1042 apic_printk(APIC_VERBOSE, KERN_DEBUG
1043 "disabling PIRQ%d\n", pin-16);
1045 irq = pirq_entries[pin-16];
1046 apic_printk(APIC_VERBOSE, KERN_DEBUG
1047 "using PIRQ%d -> IRQ %d\n",
1058 * Find a specific PCI IRQ entry.
1059 * Not an __init, possibly needed by modules
1061 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
1062 struct io_apic_irq_attr *irq_attr)
1064 int apic, i, best_guess = -1;
1066 apic_printk(APIC_DEBUG,
1067 "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
1069 if (test_bit(bus, mp_bus_not_pci)) {
1070 apic_printk(APIC_VERBOSE,
1071 "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
1074 for (i = 0; i < mp_irq_entries; i++) {
1075 int lbus = mp_irqs[i].srcbus;
1077 for (apic = 0; apic < nr_ioapics; apic++)
1078 if (mp_ioapics[apic].apicid == mp_irqs[i].dstapic ||
1079 mp_irqs[i].dstapic == MP_APIC_ALL)
1082 if (!test_bit(lbus, mp_bus_not_pci) &&
1083 !mp_irqs[i].irqtype &&
1085 (slot == ((mp_irqs[i].srcbusirq >> 2) & 0x1f))) {
1086 int irq = pin_2_irq(i, apic, mp_irqs[i].dstirq);
1088 if (!(apic || IO_APIC_IRQ(irq)))
1091 if (pin == (mp_irqs[i].srcbusirq & 3)) {
1092 set_io_apic_irq_attr(irq_attr, apic,
1099 * Use the first all-but-pin matching entry as a
1100 * best-guess fuzzy result for broken mptables.
1102 if (best_guess < 0) {
1103 set_io_apic_irq_attr(irq_attr, apic,
1113 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
1115 void lock_vector_lock(void)
1117 /* Used to the online set of cpus does not change
1118 * during assign_irq_vector.
1120 raw_spin_lock(&vector_lock);
1123 void unlock_vector_lock(void)
1125 raw_spin_unlock(&vector_lock);
1129 __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
1132 * NOTE! The local APIC isn't very good at handling
1133 * multiple interrupts at the same interrupt level.
1134 * As the interrupt level is determined by taking the
1135 * vector number and shifting that right by 4, we
1136 * want to spread these out a bit so that they don't
1137 * all fall in the same interrupt level.
1139 * Also, we've got to be careful not to trash gate
1140 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1142 static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START;
1143 static int current_offset = VECTOR_OFFSET_START % 8;
1144 unsigned int old_vector;
1146 cpumask_var_t tmp_mask;
1148 if (cfg->move_in_progress)
1151 if (!alloc_cpumask_var(&tmp_mask, GFP_ATOMIC))
1154 old_vector = cfg->vector;
1156 cpumask_and(tmp_mask, mask, cpu_online_mask);
1157 cpumask_and(tmp_mask, cfg->domain, tmp_mask);
1158 if (!cpumask_empty(tmp_mask)) {
1159 free_cpumask_var(tmp_mask);
1164 /* Only try and allocate irqs on cpus that are present */
1166 for_each_cpu_and(cpu, mask, cpu_online_mask) {
1170 apic->vector_allocation_domain(cpu, tmp_mask);
1172 vector = current_vector;
1173 offset = current_offset;
1176 if (vector >= first_system_vector) {
1177 /* If out of vectors on large boxen, must share them. */
1178 offset = (offset + 1) % 8;
1179 vector = FIRST_EXTERNAL_VECTOR + offset;
1181 if (unlikely(current_vector == vector))
1184 if (test_bit(vector, used_vectors))
1187 for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
1188 if (per_cpu(vector_irq, new_cpu)[vector] != -1)
1191 current_vector = vector;
1192 current_offset = offset;
1194 cfg->move_in_progress = 1;
1195 cpumask_copy(cfg->old_domain, cfg->domain);
1197 for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
1198 per_cpu(vector_irq, new_cpu)[vector] = irq;
1199 cfg->vector = vector;
1200 cpumask_copy(cfg->domain, tmp_mask);
1204 free_cpumask_var(tmp_mask);
1208 int assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
1211 unsigned long flags;
1213 raw_spin_lock_irqsave(&vector_lock, flags);
1214 err = __assign_irq_vector(irq, cfg, mask);
1215 raw_spin_unlock_irqrestore(&vector_lock, flags);
1219 static void __clear_irq_vector(int irq, struct irq_cfg *cfg)
1223 BUG_ON(!cfg->vector);
1225 vector = cfg->vector;
1226 for_each_cpu_and(cpu, cfg->domain, cpu_online_mask)
1227 per_cpu(vector_irq, cpu)[vector] = -1;
1230 cpumask_clear(cfg->domain);
1232 if (likely(!cfg->move_in_progress))
1234 for_each_cpu_and(cpu, cfg->old_domain, cpu_online_mask) {
1235 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS;
1237 if (per_cpu(vector_irq, cpu)[vector] != irq)
1239 per_cpu(vector_irq, cpu)[vector] = -1;
1243 cfg->move_in_progress = 0;
1246 void __setup_vector_irq(int cpu)
1248 /* Initialize vector_irq on a new cpu */
1250 struct irq_cfg *cfg;
1251 struct irq_desc *desc;
1254 * vector_lock will make sure that we don't run into irq vector
1255 * assignments that might be happening on another cpu in parallel,
1256 * while we setup our initial vector to irq mappings.
1258 raw_spin_lock(&vector_lock);
1259 /* Mark the inuse vectors */
1260 for_each_irq_desc(irq, desc) {
1261 cfg = get_irq_desc_chip_data(desc);
1264 * If it is a legacy IRQ handled by the legacy PIC, this cpu
1265 * will be part of the irq_cfg's domain.
1267 if (irq < legacy_pic->nr_legacy_irqs && !IO_APIC_IRQ(irq))
1268 cpumask_set_cpu(cpu, cfg->domain);
1270 if (!cpumask_test_cpu(cpu, cfg->domain))
1272 vector = cfg->vector;
1273 per_cpu(vector_irq, cpu)[vector] = irq;
1275 /* Mark the free vectors */
1276 for (vector = 0; vector < NR_VECTORS; ++vector) {
1277 irq = per_cpu(vector_irq, cpu)[vector];
1282 if (!cpumask_test_cpu(cpu, cfg->domain))
1283 per_cpu(vector_irq, cpu)[vector] = -1;
1285 raw_spin_unlock(&vector_lock);
1288 static struct irq_chip ioapic_chip;
1289 static struct irq_chip ir_ioapic_chip;
1291 #define IOAPIC_AUTO -1
1292 #define IOAPIC_EDGE 0
1293 #define IOAPIC_LEVEL 1
1295 #ifdef CONFIG_X86_32
1296 static inline int IO_APIC_irq_trigger(int irq)
1300 for (apic = 0; apic < nr_ioapics; apic++) {
1301 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1302 idx = find_irq_entry(apic, pin, mp_INT);
1303 if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
1304 return irq_trigger(idx);
1308 * nonexistent IRQs are edge default
1313 static inline int IO_APIC_irq_trigger(int irq)
1319 static void ioapic_register_intr(int irq, struct irq_desc *desc, unsigned long trigger)
1322 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1323 trigger == IOAPIC_LEVEL)
1324 desc->status |= IRQ_LEVEL;
1326 desc->status &= ~IRQ_LEVEL;
1328 if (irq_remapped(irq)) {
1329 desc->status |= IRQ_MOVE_PCNTXT;
1331 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
1335 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
1336 handle_edge_irq, "edge");
1340 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1341 trigger == IOAPIC_LEVEL)
1342 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1346 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1347 handle_edge_irq, "edge");
1350 int setup_ioapic_entry(int apic_id, int irq,
1351 struct IO_APIC_route_entry *entry,
1352 unsigned int destination, int trigger,
1353 int polarity, int vector, int pin)
1356 * add it to the IO-APIC irq-routing table:
1358 memset(entry,0,sizeof(*entry));
1360 if (intr_remapping_enabled) {
1361 struct intel_iommu *iommu = map_ioapic_to_ir(apic_id);
1363 struct IR_IO_APIC_route_entry *ir_entry =
1364 (struct IR_IO_APIC_route_entry *) entry;
1368 panic("No mapping iommu for ioapic %d\n", apic_id);
1370 index = alloc_irte(iommu, irq, 1);
1372 panic("Failed to allocate IRTE for ioapic %d\n", apic_id);
1374 prepare_irte(&irte, vector, destination);
1376 /* Set source-id of interrupt request */
1377 set_ioapic_sid(&irte, apic_id);
1379 modify_irte(irq, &irte);
1381 ir_entry->index2 = (index >> 15) & 0x1;
1383 ir_entry->format = 1;
1384 ir_entry->index = (index & 0x7fff);
1386 * IO-APIC RTE will be configured with virtual vector.
1387 * irq handler will do the explicit EOI to the io-apic.
1389 ir_entry->vector = pin;
1391 entry->delivery_mode = apic->irq_delivery_mode;
1392 entry->dest_mode = apic->irq_dest_mode;
1393 entry->dest = destination;
1394 entry->vector = vector;
1397 entry->mask = 0; /* enable IRQ */
1398 entry->trigger = trigger;
1399 entry->polarity = polarity;
1401 /* Mask level triggered irqs.
1402 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
1409 static void setup_IO_APIC_irq(int apic_id, int pin, unsigned int irq, struct irq_desc *desc,
1410 int trigger, int polarity)
1412 struct irq_cfg *cfg;
1413 struct IO_APIC_route_entry entry;
1416 if (!IO_APIC_IRQ(irq))
1419 cfg = get_irq_desc_chip_data(desc);
1422 * For legacy irqs, cfg->domain starts with cpu 0 for legacy
1423 * controllers like 8259. Now that IO-APIC can handle this irq, update
1426 if (irq < legacy_pic->nr_legacy_irqs && cpumask_test_cpu(0, cfg->domain))
1427 apic->vector_allocation_domain(0, cfg->domain);
1429 if (assign_irq_vector(irq, cfg, apic->target_cpus()))
1432 dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
1434 apic_printk(APIC_VERBOSE,KERN_DEBUG
1435 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
1436 "IRQ %d Mode:%i Active:%i)\n",
1437 apic_id, mp_ioapics[apic_id].apicid, pin, cfg->vector,
1438 irq, trigger, polarity);
1441 if (setup_ioapic_entry(mp_ioapics[apic_id].apicid, irq, &entry,
1442 dest, trigger, polarity, cfg->vector, pin)) {
1443 printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
1444 mp_ioapics[apic_id].apicid, pin);
1445 __clear_irq_vector(irq, cfg);
1449 ioapic_register_intr(irq, desc, trigger);
1450 if (irq < legacy_pic->nr_legacy_irqs)
1451 legacy_pic->mask(irq);
1453 ioapic_write_entry(apic_id, pin, entry);
1457 DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
1458 } mp_ioapic_routing[MAX_IO_APICS];
1460 static void __init setup_IO_APIC_irqs(void)
1462 int apic_id, pin, idx, irq;
1464 struct irq_desc *desc;
1465 struct irq_cfg *cfg;
1466 int node = cpu_to_node(0);
1468 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1470 for (apic_id = 0; apic_id < nr_ioapics; apic_id++)
1471 for (pin = 0; pin < nr_ioapic_registers[apic_id]; pin++) {
1472 idx = find_irq_entry(apic_id, pin, mp_INT);
1476 apic_printk(APIC_VERBOSE,
1477 KERN_DEBUG " %d-%d",
1478 mp_ioapics[apic_id].apicid, pin);
1480 apic_printk(APIC_VERBOSE, " %d-%d",
1481 mp_ioapics[apic_id].apicid, pin);
1485 apic_printk(APIC_VERBOSE,
1486 " (apicid-pin) not connected\n");
1490 irq = pin_2_irq(idx, apic_id, pin);
1492 if ((apic_id > 0) && (irq > 16))
1496 * Skip the timer IRQ if there's a quirk handler
1497 * installed and if it returns 1:
1499 if (apic->multi_timer_check &&
1500 apic->multi_timer_check(apic_id, irq))
1503 desc = irq_to_desc_alloc_node(irq, node);
1505 printk(KERN_INFO "can not get irq_desc for %d\n", irq);
1508 cfg = get_irq_desc_chip_data(desc);
1509 add_pin_to_irq_node(cfg, node, apic_id, pin);
1511 * don't mark it in pin_programmed, so later acpi could
1512 * set it correctly when irq < 16
1514 setup_IO_APIC_irq(apic_id, pin, irq, desc,
1515 irq_trigger(idx), irq_polarity(idx));
1519 apic_printk(APIC_VERBOSE,
1520 " (apicid-pin) not connected\n");
1524 * for the gsit that is not in first ioapic
1525 * but could not use acpi_register_gsi()
1526 * like some special sci in IBM x3330
1528 void setup_IO_APIC_irq_extra(u32 gsi)
1530 int apic_id = 0, pin, idx, irq;
1531 int node = cpu_to_node(0);
1532 struct irq_desc *desc;
1533 struct irq_cfg *cfg;
1536 * Convert 'gsi' to 'ioapic.pin'.
1538 apic_id = mp_find_ioapic(gsi);
1542 pin = mp_find_ioapic_pin(apic_id, gsi);
1543 idx = find_irq_entry(apic_id, pin, mp_INT);
1547 irq = pin_2_irq(idx, apic_id, pin);
1548 #ifdef CONFIG_SPARSE_IRQ
1549 desc = irq_to_desc(irq);
1553 desc = irq_to_desc_alloc_node(irq, node);
1555 printk(KERN_INFO "can not get irq_desc for %d\n", irq);
1559 cfg = get_irq_desc_chip_data(desc);
1560 add_pin_to_irq_node(cfg, node, apic_id, pin);
1562 if (test_bit(pin, mp_ioapic_routing[apic_id].pin_programmed)) {
1563 pr_debug("Pin %d-%d already programmed\n",
1564 mp_ioapics[apic_id].apicid, pin);
1567 set_bit(pin, mp_ioapic_routing[apic_id].pin_programmed);
1569 setup_IO_APIC_irq(apic_id, pin, irq, desc,
1570 irq_trigger(idx), irq_polarity(idx));
1574 * Set up the timer pin, possibly with the 8259A-master behind.
1576 static void __init setup_timer_IRQ0_pin(unsigned int apic_id, unsigned int pin,
1579 struct IO_APIC_route_entry entry;
1581 if (intr_remapping_enabled)
1584 memset(&entry, 0, sizeof(entry));
1587 * We use logical delivery to get the timer IRQ
1590 entry.dest_mode = apic->irq_dest_mode;
1591 entry.mask = 0; /* don't mask IRQ for edge */
1592 entry.dest = apic->cpu_mask_to_apicid(apic->target_cpus());
1593 entry.delivery_mode = apic->irq_delivery_mode;
1596 entry.vector = vector;
1599 * The timer IRQ doesn't have to know that behind the
1600 * scene we may have a 8259A-master in AEOI mode ...
1602 set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
1605 * Add it to the IO-APIC irq-routing table:
1607 ioapic_write_entry(apic_id, pin, entry);
1611 __apicdebuginit(void) print_IO_APIC(void)
1614 union IO_APIC_reg_00 reg_00;
1615 union IO_APIC_reg_01 reg_01;
1616 union IO_APIC_reg_02 reg_02;
1617 union IO_APIC_reg_03 reg_03;
1618 unsigned long flags;
1619 struct irq_cfg *cfg;
1620 struct irq_desc *desc;
1623 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1624 for (i = 0; i < nr_ioapics; i++)
1625 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1626 mp_ioapics[i].apicid, nr_ioapic_registers[i]);
1629 * We are a bit conservative about what we expect. We have to
1630 * know about every hardware change ASAP.
1632 printk(KERN_INFO "testing the IO APIC.......................\n");
1634 for (apic = 0; apic < nr_ioapics; apic++) {
1636 raw_spin_lock_irqsave(&ioapic_lock, flags);
1637 reg_00.raw = io_apic_read(apic, 0);
1638 reg_01.raw = io_apic_read(apic, 1);
1639 if (reg_01.bits.version >= 0x10)
1640 reg_02.raw = io_apic_read(apic, 2);
1641 if (reg_01.bits.version >= 0x20)
1642 reg_03.raw = io_apic_read(apic, 3);
1643 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1646 printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].apicid);
1647 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1648 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1649 printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
1650 printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
1652 printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
1653 printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
1655 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1656 printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
1659 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1660 * but the value of reg_02 is read as the previous read register
1661 * value, so ignore it if reg_02 == reg_01.
1663 if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1664 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1665 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1669 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1670 * or reg_03, but the value of reg_0[23] is read as the previous read
1671 * register value, so ignore it if reg_03 == reg_0[12].
1673 if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1674 reg_03.raw != reg_01.raw) {
1675 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1676 printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
1679 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1681 printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
1682 " Stat Dmod Deli Vect:\n");
1684 for (i = 0; i <= reg_01.bits.entries; i++) {
1685 struct IO_APIC_route_entry entry;
1687 entry = ioapic_read_entry(apic, i);
1689 printk(KERN_DEBUG " %02x %03X ",
1694 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1699 entry.delivery_status,
1701 entry.delivery_mode,
1706 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1707 for_each_irq_desc(irq, desc) {
1708 struct irq_pin_list *entry;
1710 cfg = get_irq_desc_chip_data(desc);
1713 entry = cfg->irq_2_pin;
1716 printk(KERN_DEBUG "IRQ%d ", irq);
1717 for_each_irq_pin(entry, cfg->irq_2_pin)
1718 printk("-> %d:%d", entry->apic, entry->pin);
1722 printk(KERN_INFO ".................................... done.\n");
1727 __apicdebuginit(void) print_APIC_field(int base)
1733 for (i = 0; i < 8; i++)
1734 printk(KERN_CONT "%08x", apic_read(base + i*0x10));
1736 printk(KERN_CONT "\n");
1739 __apicdebuginit(void) print_local_APIC(void *dummy)
1741 unsigned int i, v, ver, maxlvt;
1744 printk(KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1745 smp_processor_id(), hard_smp_processor_id());
1746 v = apic_read(APIC_ID);
1747 printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, read_apic_id());
1748 v = apic_read(APIC_LVR);
1749 printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1750 ver = GET_APIC_VERSION(v);
1751 maxlvt = lapic_get_maxlvt();
1753 v = apic_read(APIC_TASKPRI);
1754 printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1756 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1757 if (!APIC_XAPIC(ver)) {
1758 v = apic_read(APIC_ARBPRI);
1759 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1760 v & APIC_ARBPRI_MASK);
1762 v = apic_read(APIC_PROCPRI);
1763 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1767 * Remote read supported only in the 82489DX and local APIC for
1768 * Pentium processors.
1770 if (!APIC_INTEGRATED(ver) || maxlvt == 3) {
1771 v = apic_read(APIC_RRR);
1772 printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1775 v = apic_read(APIC_LDR);
1776 printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1777 if (!x2apic_enabled()) {
1778 v = apic_read(APIC_DFR);
1779 printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1781 v = apic_read(APIC_SPIV);
1782 printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1784 printk(KERN_DEBUG "... APIC ISR field:\n");
1785 print_APIC_field(APIC_ISR);
1786 printk(KERN_DEBUG "... APIC TMR field:\n");
1787 print_APIC_field(APIC_TMR);
1788 printk(KERN_DEBUG "... APIC IRR field:\n");
1789 print_APIC_field(APIC_IRR);
1791 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1792 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
1793 apic_write(APIC_ESR, 0);
1795 v = apic_read(APIC_ESR);
1796 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1799 icr = apic_icr_read();
1800 printk(KERN_DEBUG "... APIC ICR: %08x\n", (u32)icr);
1801 printk(KERN_DEBUG "... APIC ICR2: %08x\n", (u32)(icr >> 32));
1803 v = apic_read(APIC_LVTT);
1804 printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1806 if (maxlvt > 3) { /* PC is LVT#4. */
1807 v = apic_read(APIC_LVTPC);
1808 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1810 v = apic_read(APIC_LVT0);
1811 printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1812 v = apic_read(APIC_LVT1);
1813 printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1815 if (maxlvt > 2) { /* ERR is LVT#3. */
1816 v = apic_read(APIC_LVTERR);
1817 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1820 v = apic_read(APIC_TMICT);
1821 printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1822 v = apic_read(APIC_TMCCT);
1823 printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1824 v = apic_read(APIC_TDCR);
1825 printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1827 if (boot_cpu_has(X86_FEATURE_EXTAPIC)) {
1828 v = apic_read(APIC_EFEAT);
1829 maxlvt = (v >> 16) & 0xff;
1830 printk(KERN_DEBUG "... APIC EFEAT: %08x\n", v);
1831 v = apic_read(APIC_ECTRL);
1832 printk(KERN_DEBUG "... APIC ECTRL: %08x\n", v);
1833 for (i = 0; i < maxlvt; i++) {
1834 v = apic_read(APIC_EILVTn(i));
1835 printk(KERN_DEBUG "... APIC EILVT%d: %08x\n", i, v);
1841 __apicdebuginit(void) print_local_APICs(int maxcpu)
1849 for_each_online_cpu(cpu) {
1852 smp_call_function_single(cpu, print_local_APIC, NULL, 1);
1857 __apicdebuginit(void) print_PIC(void)
1860 unsigned long flags;
1862 if (!legacy_pic->nr_legacy_irqs)
1865 printk(KERN_DEBUG "\nprinting PIC contents\n");
1867 raw_spin_lock_irqsave(&i8259A_lock, flags);
1869 v = inb(0xa1) << 8 | inb(0x21);
1870 printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
1872 v = inb(0xa0) << 8 | inb(0x20);
1873 printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
1877 v = inb(0xa0) << 8 | inb(0x20);
1881 raw_spin_unlock_irqrestore(&i8259A_lock, flags);
1883 printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
1885 v = inb(0x4d1) << 8 | inb(0x4d0);
1886 printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1889 static int __initdata show_lapic = 1;
1890 static __init int setup_show_lapic(char *arg)
1894 if (strcmp(arg, "all") == 0) {
1895 show_lapic = CONFIG_NR_CPUS;
1897 get_option(&arg, &num);
1904 __setup("show_lapic=", setup_show_lapic);
1906 __apicdebuginit(int) print_ICs(void)
1908 if (apic_verbosity == APIC_QUIET)
1913 /* don't print out if apic is not there */
1914 if (!cpu_has_apic && !apic_from_smp_config())
1917 print_local_APICs(show_lapic);
1923 fs_initcall(print_ICs);
1926 /* Where if anywhere is the i8259 connect in external int mode */
1927 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
1929 void __init enable_IO_APIC(void)
1931 int i8259_apic, i8259_pin;
1934 if (!legacy_pic->nr_legacy_irqs)
1937 for(apic = 0; apic < nr_ioapics; apic++) {
1939 /* See if any of the pins is in ExtINT mode */
1940 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1941 struct IO_APIC_route_entry entry;
1942 entry = ioapic_read_entry(apic, pin);
1944 /* If the interrupt line is enabled and in ExtInt mode
1945 * I have found the pin where the i8259 is connected.
1947 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1948 ioapic_i8259.apic = apic;
1949 ioapic_i8259.pin = pin;
1955 /* Look to see what if the MP table has reported the ExtINT */
1956 /* If we could not find the appropriate pin by looking at the ioapic
1957 * the i8259 probably is not connected the ioapic but give the
1958 * mptable a chance anyway.
1960 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1961 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1962 /* Trust the MP table if nothing is setup in the hardware */
1963 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1964 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1965 ioapic_i8259.pin = i8259_pin;
1966 ioapic_i8259.apic = i8259_apic;
1968 /* Complain if the MP table and the hardware disagree */
1969 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1970 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1972 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1976 * Do not trust the IO-APIC being empty at bootup
1982 * Not an __init, needed by the reboot code
1984 void disable_IO_APIC(void)
1987 * Clear the IO-APIC before rebooting:
1991 if (!legacy_pic->nr_legacy_irqs)
1995 * If the i8259 is routed through an IOAPIC
1996 * Put that IOAPIC in virtual wire mode
1997 * so legacy interrupts can be delivered.
1999 * With interrupt-remapping, for now we will use virtual wire A mode,
2000 * as virtual wire B is little complex (need to configure both
2001 * IOAPIC RTE aswell as interrupt-remapping table entry).
2002 * As this gets called during crash dump, keep this simple for now.
2004 if (ioapic_i8259.pin != -1 && !intr_remapping_enabled) {
2005 struct IO_APIC_route_entry entry;
2007 memset(&entry, 0, sizeof(entry));
2008 entry.mask = 0; /* Enabled */
2009 entry.trigger = 0; /* Edge */
2011 entry.polarity = 0; /* High */
2012 entry.delivery_status = 0;
2013 entry.dest_mode = 0; /* Physical */
2014 entry.delivery_mode = dest_ExtINT; /* ExtInt */
2016 entry.dest = read_apic_id();
2019 * Add it to the IO-APIC irq-routing table:
2021 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
2025 * Use virtual wire A mode when interrupt remapping is enabled.
2027 if (cpu_has_apic || apic_from_smp_config())
2028 disconnect_bsp_APIC(!intr_remapping_enabled &&
2029 ioapic_i8259.pin != -1);
2032 #ifdef CONFIG_X86_32
2034 * function to set the IO-APIC physical IDs based on the
2035 * values stored in the MPC table.
2037 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
2040 void __init setup_ioapic_ids_from_mpc(void)
2042 union IO_APIC_reg_00 reg_00;
2043 physid_mask_t phys_id_present_map;
2046 unsigned char old_id;
2047 unsigned long flags;
2052 * Don't check I/O APIC IDs for xAPIC systems. They have
2053 * no meaning without the serial APIC bus.
2055 if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
2056 || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
2059 * This is broken; anything with a real cpu count has to
2060 * circumvent this idiocy regardless.
2062 apic->ioapic_phys_id_map(&phys_cpu_present_map, &phys_id_present_map);
2065 * Set the IOAPIC ID to the value stored in the MPC table.
2067 for (apic_id = 0; apic_id < nr_ioapics; apic_id++) {
2069 /* Read the register 0 value */
2070 raw_spin_lock_irqsave(&ioapic_lock, flags);
2071 reg_00.raw = io_apic_read(apic_id, 0);
2072 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2074 old_id = mp_ioapics[apic_id].apicid;
2076 if (mp_ioapics[apic_id].apicid >= get_physical_broadcast()) {
2077 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
2078 apic_id, mp_ioapics[apic_id].apicid);
2079 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
2081 mp_ioapics[apic_id].apicid = reg_00.bits.ID;
2085 * Sanity check, is the ID really free? Every APIC in a
2086 * system must have a unique ID or we get lots of nice
2087 * 'stuck on smp_invalidate_needed IPI wait' messages.
2089 if (apic->check_apicid_used(&phys_id_present_map,
2090 mp_ioapics[apic_id].apicid)) {
2091 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
2092 apic_id, mp_ioapics[apic_id].apicid);
2093 for (i = 0; i < get_physical_broadcast(); i++)
2094 if (!physid_isset(i, phys_id_present_map))
2096 if (i >= get_physical_broadcast())
2097 panic("Max APIC ID exceeded!\n");
2098 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
2100 physid_set(i, phys_id_present_map);
2101 mp_ioapics[apic_id].apicid = i;
2104 apic->apicid_to_cpu_present(mp_ioapics[apic_id].apicid, &tmp);
2105 apic_printk(APIC_VERBOSE, "Setting %d in the "
2106 "phys_id_present_map\n",
2107 mp_ioapics[apic_id].apicid);
2108 physids_or(phys_id_present_map, phys_id_present_map, tmp);
2113 * We need to adjust the IRQ routing table
2114 * if the ID changed.
2116 if (old_id != mp_ioapics[apic_id].apicid)
2117 for (i = 0; i < mp_irq_entries; i++)
2118 if (mp_irqs[i].dstapic == old_id)
2120 = mp_ioapics[apic_id].apicid;
2123 * Read the right value from the MPC table and
2124 * write it into the ID register.
2126 apic_printk(APIC_VERBOSE, KERN_INFO
2127 "...changing IO-APIC physical APIC ID to %d ...",
2128 mp_ioapics[apic_id].apicid);
2130 reg_00.bits.ID = mp_ioapics[apic_id].apicid;
2131 raw_spin_lock_irqsave(&ioapic_lock, flags);
2132 io_apic_write(apic_id, 0, reg_00.raw);
2133 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2138 raw_spin_lock_irqsave(&ioapic_lock, flags);
2139 reg_00.raw = io_apic_read(apic_id, 0);
2140 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2141 if (reg_00.bits.ID != mp_ioapics[apic_id].apicid)
2142 printk("could not set ID!\n");
2144 apic_printk(APIC_VERBOSE, " ok.\n");
2149 int no_timer_check __initdata;
2151 static int __init notimercheck(char *s)
2156 __setup("no_timer_check", notimercheck);
2159 * There is a nasty bug in some older SMP boards, their mptable lies
2160 * about the timer IRQ. We do the following to work around the situation:
2162 * - timer IRQ defaults to IO-APIC IRQ
2163 * - if this function detects that timer IRQs are defunct, then we fall
2164 * back to ISA timer IRQs
2166 static int __init timer_irq_works(void)
2168 unsigned long t1 = jiffies;
2169 unsigned long flags;
2174 local_save_flags(flags);
2176 /* Let ten ticks pass... */
2177 mdelay((10 * 1000) / HZ);
2178 local_irq_restore(flags);
2181 * Expect a few ticks at least, to be sure some possible
2182 * glue logic does not lock up after one or two first
2183 * ticks in a non-ExtINT mode. Also the local APIC
2184 * might have cached one ExtINT interrupt. Finally, at
2185 * least one tick may be lost due to delays.
2189 if (time_after(jiffies, t1 + 4))
2195 * In the SMP+IOAPIC case it might happen that there are an unspecified
2196 * number of pending IRQ events unhandled. These cases are very rare,
2197 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
2198 * better to do it this way as thus we do not have to be aware of
2199 * 'pending' interrupts in the IRQ path, except at this point.
2202 * Edge triggered needs to resend any interrupt
2203 * that was delayed but this is now handled in the device
2208 * Starting up a edge-triggered IO-APIC interrupt is
2209 * nasty - we need to make sure that we get the edge.
2210 * If it is already asserted for some reason, we need
2211 * return 1 to indicate that is was pending.
2213 * This is not complete - we should be able to fake
2214 * an edge even if it isn't on the 8259A...
2217 static unsigned int startup_ioapic_irq(struct irq_data *data)
2219 int was_pending = 0, irq = data->irq;
2220 unsigned long flags;
2222 raw_spin_lock_irqsave(&ioapic_lock, flags);
2223 if (irq < legacy_pic->nr_legacy_irqs) {
2224 legacy_pic->mask(irq);
2225 if (legacy_pic->irq_pending(irq))
2228 __unmask_ioapic(data->chip_data);
2229 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2234 static int ioapic_retrigger_irq(struct irq_data *data)
2236 struct irq_cfg *cfg = data->chip_data;
2237 unsigned long flags;
2239 raw_spin_lock_irqsave(&vector_lock, flags);
2240 apic->send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);
2241 raw_spin_unlock_irqrestore(&vector_lock, flags);
2247 * Level and edge triggered IO-APIC interrupts need different handling,
2248 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
2249 * handled with the level-triggered descriptor, but that one has slightly
2250 * more overhead. Level-triggered interrupts cannot be handled with the
2251 * edge-triggered handler, without risking IRQ storms and other ugly
2256 void send_cleanup_vector(struct irq_cfg *cfg)
2258 cpumask_var_t cleanup_mask;
2260 if (unlikely(!alloc_cpumask_var(&cleanup_mask, GFP_ATOMIC))) {
2262 for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
2263 apic->send_IPI_mask(cpumask_of(i), IRQ_MOVE_CLEANUP_VECTOR);
2265 cpumask_and(cleanup_mask, cfg->old_domain, cpu_online_mask);
2266 apic->send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
2267 free_cpumask_var(cleanup_mask);
2269 cfg->move_in_progress = 0;
2272 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, struct irq_cfg *cfg)
2275 struct irq_pin_list *entry;
2276 u8 vector = cfg->vector;
2278 for_each_irq_pin(entry, cfg->irq_2_pin) {
2284 * With interrupt-remapping, destination information comes
2285 * from interrupt-remapping table entry.
2287 if (!irq_remapped(irq))
2288 io_apic_write(apic, 0x11 + pin*2, dest);
2289 reg = io_apic_read(apic, 0x10 + pin*2);
2290 reg &= ~IO_APIC_REDIR_VECTOR_MASK;
2292 io_apic_modify(apic, 0x10 + pin*2, reg);
2297 * Either sets desc->affinity to a valid value, and returns
2298 * ->cpu_mask_to_apicid of that in dest_id, or returns -1 and
2299 * leaves desc->affinity untouched.
2302 set_desc_affinity(struct irq_desc *desc, const struct cpumask *mask,
2303 unsigned int *dest_id)
2305 struct irq_cfg *cfg;
2308 if (!cpumask_intersects(mask, cpu_online_mask))
2312 cfg = get_irq_desc_chip_data(desc);
2313 if (assign_irq_vector(irq, cfg, mask))
2316 cpumask_copy(desc->affinity, mask);
2318 *dest_id = apic->cpu_mask_to_apicid_and(desc->affinity, cfg->domain);
2323 set_ioapic_affinity_irq_desc(struct irq_desc *desc, const struct cpumask *mask)
2325 struct irq_cfg *cfg;
2326 unsigned long flags;
2332 cfg = get_irq_desc_chip_data(desc);
2334 raw_spin_lock_irqsave(&ioapic_lock, flags);
2335 ret = set_desc_affinity(desc, mask, &dest);
2337 /* Only the high 8 bits are valid. */
2338 dest = SET_APIC_LOGICAL_ID(dest);
2339 __target_IO_APIC_irq(irq, dest, cfg);
2341 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2347 set_ioapic_affinity_irq(unsigned int irq, const struct cpumask *mask)
2349 struct irq_desc *desc;
2351 desc = irq_to_desc(irq);
2353 return set_ioapic_affinity_irq_desc(desc, mask);
2356 #ifdef CONFIG_INTR_REMAP
2359 * Migrate the IO-APIC irq in the presence of intr-remapping.
2361 * For both level and edge triggered, irq migration is a simple atomic
2362 * update(of vector and cpu destination) of IRTE and flush the hardware cache.
2364 * For level triggered, we eliminate the io-apic RTE modification (with the
2365 * updated vector information), by using a virtual vector (io-apic pin number).
2366 * Real vector that is used for interrupting cpu will be coming from
2367 * the interrupt-remapping table entry.
2370 migrate_ioapic_irq_desc(struct irq_desc *desc, const struct cpumask *mask)
2372 struct irq_cfg *cfg;
2378 if (!cpumask_intersects(mask, cpu_online_mask))
2382 if (get_irte(irq, &irte))
2385 cfg = get_irq_desc_chip_data(desc);
2386 if (assign_irq_vector(irq, cfg, mask))
2389 dest = apic->cpu_mask_to_apicid_and(cfg->domain, mask);
2391 irte.vector = cfg->vector;
2392 irte.dest_id = IRTE_DEST(dest);
2395 * Modified the IRTE and flushes the Interrupt entry cache.
2397 modify_irte(irq, &irte);
2399 if (cfg->move_in_progress)
2400 send_cleanup_vector(cfg);
2402 cpumask_copy(desc->affinity, mask);
2408 * Migrates the IRQ destination in the process context.
2410 static int set_ir_ioapic_affinity_irq_desc(struct irq_desc *desc,
2411 const struct cpumask *mask)
2413 return migrate_ioapic_irq_desc(desc, mask);
2415 static int set_ir_ioapic_affinity_irq(unsigned int irq,
2416 const struct cpumask *mask)
2418 struct irq_desc *desc = irq_to_desc(irq);
2420 return set_ir_ioapic_affinity_irq_desc(desc, mask);
2423 static inline int set_ir_ioapic_affinity_irq_desc(struct irq_desc *desc,
2424 const struct cpumask *mask)
2430 asmlinkage void smp_irq_move_cleanup_interrupt(void)
2432 unsigned vector, me;
2438 me = smp_processor_id();
2439 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
2442 struct irq_desc *desc;
2443 struct irq_cfg *cfg;
2444 irq = __get_cpu_var(vector_irq)[vector];
2449 desc = irq_to_desc(irq);
2454 raw_spin_lock(&desc->lock);
2457 * Check if the irq migration is in progress. If so, we
2458 * haven't received the cleanup request yet for this irq.
2460 if (cfg->move_in_progress)
2463 if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
2466 irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
2468 * Check if the vector that needs to be cleanedup is
2469 * registered at the cpu's IRR. If so, then this is not
2470 * the best time to clean it up. Lets clean it up in the
2471 * next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR
2474 if (irr & (1 << (vector % 32))) {
2475 apic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR);
2478 __get_cpu_var(vector_irq)[vector] = -1;
2480 raw_spin_unlock(&desc->lock);
2486 static void __irq_complete_move(struct irq_cfg *cfg, unsigned vector)
2490 if (likely(!cfg->move_in_progress))
2493 me = smp_processor_id();
2495 if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
2496 send_cleanup_vector(cfg);
2499 static void irq_complete_move(struct irq_cfg *cfg)
2501 __irq_complete_move(cfg, ~get_irq_regs()->orig_ax);
2504 void irq_force_complete_move(int irq)
2506 struct irq_cfg *cfg = get_irq_chip_data(irq);
2511 __irq_complete_move(cfg, cfg->vector);
2514 static inline void irq_complete_move(struct irq_cfg *cfg) { }
2517 static void ack_apic_edge(struct irq_data *data)
2519 irq_complete_move(data->chip_data);
2520 move_native_irq(data->irq);
2524 atomic_t irq_mis_count;
2527 * IO-APIC versions below 0x20 don't support EOI register.
2528 * For the record, here is the information about various versions:
2530 * 1Xh I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
2531 * 2Xh I/O(x)APIC which is PCI 2.2 Compliant
2534 * Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
2535 * version as 0x2. This is an error with documentation and these ICH chips
2536 * use io-apic's of version 0x20.
2538 * For IO-APIC's with EOI register, we use that to do an explicit EOI.
2539 * Otherwise, we simulate the EOI message manually by changing the trigger
2540 * mode to edge and then back to level, with RTE being masked during this.
2542 static void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
2544 struct irq_pin_list *entry;
2545 unsigned long flags;
2547 raw_spin_lock_irqsave(&ioapic_lock, flags);
2548 for_each_irq_pin(entry, cfg->irq_2_pin) {
2549 if (mp_ioapics[entry->apic].apicver >= 0x20) {
2551 * Intr-remapping uses pin number as the virtual vector
2552 * in the RTE. Actual vector is programmed in
2553 * intr-remapping table entry. Hence for the io-apic
2554 * EOI we use the pin number.
2556 if (irq_remapped(irq))
2557 io_apic_eoi(entry->apic, entry->pin);
2559 io_apic_eoi(entry->apic, cfg->vector);
2561 __mask_and_edge_IO_APIC_irq(entry);
2562 __unmask_and_level_IO_APIC_irq(entry);
2565 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2568 static void ack_apic_level(struct irq_data *data)
2570 struct irq_cfg *cfg = data->chip_data;
2571 int i, do_unmask_irq = 0, irq = data->irq;
2572 struct irq_desc *desc = irq_to_desc(irq);
2575 irq_complete_move(cfg);
2576 #ifdef CONFIG_GENERIC_PENDING_IRQ
2577 /* If we are moving the irq we need to mask it */
2578 if (unlikely(desc->status & IRQ_MOVE_PENDING)) {
2585 * It appears there is an erratum which affects at least version 0x11
2586 * of I/O APIC (that's the 82093AA and cores integrated into various
2587 * chipsets). Under certain conditions a level-triggered interrupt is
2588 * erroneously delivered as edge-triggered one but the respective IRR
2589 * bit gets set nevertheless. As a result the I/O unit expects an EOI
2590 * message but it will never arrive and further interrupts are blocked
2591 * from the source. The exact reason is so far unknown, but the
2592 * phenomenon was observed when two consecutive interrupt requests
2593 * from a given source get delivered to the same CPU and the source is
2594 * temporarily disabled in between.
2596 * A workaround is to simulate an EOI message manually. We achieve it
2597 * by setting the trigger mode to edge and then to level when the edge
2598 * trigger mode gets detected in the TMR of a local APIC for a
2599 * level-triggered interrupt. We mask the source for the time of the
2600 * operation to prevent an edge-triggered interrupt escaping meanwhile.
2601 * The idea is from Manfred Spraul. --macro
2603 * Also in the case when cpu goes offline, fixup_irqs() will forward
2604 * any unhandled interrupt on the offlined cpu to the new cpu
2605 * destination that is handling the corresponding interrupt. This
2606 * interrupt forwarding is done via IPI's. Hence, in this case also
2607 * level-triggered io-apic interrupt will be seen as an edge
2608 * interrupt in the IRR. And we can't rely on the cpu's EOI
2609 * to be broadcasted to the IO-APIC's which will clear the remoteIRR
2610 * corresponding to the level-triggered interrupt. Hence on IO-APIC's
2611 * supporting EOI register, we do an explicit EOI to clear the
2612 * remote IRR and on IO-APIC's which don't have an EOI register,
2613 * we use the above logic (mask+edge followed by unmask+level) from
2614 * Manfred Spraul to clear the remote IRR.
2617 v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
2620 * We must acknowledge the irq before we move it or the acknowledge will
2621 * not propagate properly.
2626 * Tail end of clearing remote IRR bit (either by delivering the EOI
2627 * message via io-apic EOI register write or simulating it using
2628 * mask+edge followed by unnask+level logic) manually when the
2629 * level triggered interrupt is seen as the edge triggered interrupt
2632 if (!(v & (1 << (i & 0x1f)))) {
2633 atomic_inc(&irq_mis_count);
2635 eoi_ioapic_irq(irq, cfg);
2638 /* Now we can move and renable the irq */
2639 if (unlikely(do_unmask_irq)) {
2640 /* Only migrate the irq if the ack has been received.
2642 * On rare occasions the broadcast level triggered ack gets
2643 * delayed going to ioapics, and if we reprogram the
2644 * vector while Remote IRR is still set the irq will never
2647 * To prevent this scenario we read the Remote IRR bit
2648 * of the ioapic. This has two effects.
2649 * - On any sane system the read of the ioapic will
2650 * flush writes (and acks) going to the ioapic from
2652 * - We get to see if the ACK has actually been delivered.
2654 * Based on failed experiments of reprogramming the
2655 * ioapic entry from outside of irq context starting
2656 * with masking the ioapic entry and then polling until
2657 * Remote IRR was clear before reprogramming the
2658 * ioapic I don't trust the Remote IRR bit to be
2659 * completey accurate.
2661 * However there appears to be no other way to plug
2662 * this race, so if the Remote IRR bit is not
2663 * accurate and is causing problems then it is a hardware bug
2664 * and you can go talk to the chipset vendor about it.
2666 if (!io_apic_level_ack_pending(cfg))
2667 move_masked_irq(irq);
2672 #ifdef CONFIG_INTR_REMAP
2673 static void ir_ack_apic_edge(struct irq_data *data)
2678 static void ir_ack_apic_level(struct irq_data *data)
2681 eoi_ioapic_irq(data->irq, data->chip_data);
2683 #endif /* CONFIG_INTR_REMAP */
2685 static struct irq_chip ioapic_chip __read_mostly = {
2687 .irq_startup = startup_ioapic_irq,
2688 .irq_mask = mask_ioapic_irq,
2689 .irq_unmask = unmask_ioapic_irq,
2690 .irq_ack = ack_apic_edge,
2691 .irq_eoi = ack_apic_level,
2693 .set_affinity = set_ioapic_affinity_irq,
2695 .irq_retrigger = ioapic_retrigger_irq,
2698 static struct irq_chip ir_ioapic_chip __read_mostly = {
2699 .name = "IR-IO-APIC",
2700 .irq_startup = startup_ioapic_irq,
2701 .irq_mask = mask_ioapic_irq,
2702 .irq_unmask = unmask_ioapic_irq,
2703 #ifdef CONFIG_INTR_REMAP
2704 .irq_ack = ir_ack_apic_edge,
2705 .irq_eoi = ir_ack_apic_level,
2707 .set_affinity = set_ir_ioapic_affinity_irq,
2710 .irq_retrigger = ioapic_retrigger_irq,
2713 static inline void init_IO_APIC_traps(void)
2716 struct irq_desc *desc;
2717 struct irq_cfg *cfg;
2720 * NOTE! The local APIC isn't very good at handling
2721 * multiple interrupts at the same interrupt level.
2722 * As the interrupt level is determined by taking the
2723 * vector number and shifting that right by 4, we
2724 * want to spread these out a bit so that they don't
2725 * all fall in the same interrupt level.
2727 * Also, we've got to be careful not to trash gate
2728 * 0x80, because int 0x80 is hm, kind of importantish. ;)
2730 for_each_irq_desc(irq, desc) {
2731 cfg = get_irq_desc_chip_data(desc);
2732 if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
2734 * Hmm.. We don't have an entry for this,
2735 * so default to an old-fashioned 8259
2736 * interrupt if we can..
2738 if (irq < legacy_pic->nr_legacy_irqs)
2739 legacy_pic->make_irq(irq);
2741 /* Strange. Oh, well.. */
2742 desc->chip = &no_irq_chip;
2748 * The local APIC irq-chip implementation:
2751 static void mask_lapic_irq(struct irq_data *data)
2755 v = apic_read(APIC_LVT0);
2756 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
2759 static void unmask_lapic_irq(struct irq_data *data)
2763 v = apic_read(APIC_LVT0);
2764 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
2767 static void ack_lapic_irq(struct irq_data *data)
2772 static struct irq_chip lapic_chip __read_mostly = {
2773 .name = "local-APIC",
2774 .irq_mask = mask_lapic_irq,
2775 .irq_unmask = unmask_lapic_irq,
2776 .irq_ack = ack_lapic_irq,
2779 static void lapic_register_intr(int irq, struct irq_desc *desc)
2781 desc->status &= ~IRQ_LEVEL;
2782 set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
2786 static void __init setup_nmi(void)
2789 * Dirty trick to enable the NMI watchdog ...
2790 * We put the 8259A master into AEOI mode and
2791 * unmask on all local APICs LVT0 as NMI.
2793 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2794 * is from Maciej W. Rozycki - so we do not have to EOI from
2795 * the NMI handler or the timer interrupt.
2797 apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
2799 enable_NMI_through_LVT0();
2801 apic_printk(APIC_VERBOSE, " done.\n");
2805 * This looks a bit hackish but it's about the only one way of sending
2806 * a few INTA cycles to 8259As and any associated glue logic. ICR does
2807 * not support the ExtINT mode, unfortunately. We need to send these
2808 * cycles as some i82489DX-based boards have glue logic that keeps the
2809 * 8259A interrupt line asserted until INTA. --macro
2811 static inline void __init unlock_ExtINT_logic(void)
2814 struct IO_APIC_route_entry entry0, entry1;
2815 unsigned char save_control, save_freq_select;
2817 pin = find_isa_irq_pin(8, mp_INT);
2822 apic = find_isa_irq_apic(8, mp_INT);
2828 entry0 = ioapic_read_entry(apic, pin);
2829 clear_IO_APIC_pin(apic, pin);
2831 memset(&entry1, 0, sizeof(entry1));
2833 entry1.dest_mode = 0; /* physical delivery */
2834 entry1.mask = 0; /* unmask IRQ now */
2835 entry1.dest = hard_smp_processor_id();
2836 entry1.delivery_mode = dest_ExtINT;
2837 entry1.polarity = entry0.polarity;
2841 ioapic_write_entry(apic, pin, entry1);
2843 save_control = CMOS_READ(RTC_CONTROL);
2844 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2845 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2847 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2852 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2856 CMOS_WRITE(save_control, RTC_CONTROL);
2857 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2858 clear_IO_APIC_pin(apic, pin);
2860 ioapic_write_entry(apic, pin, entry0);
2863 static int disable_timer_pin_1 __initdata;
2864 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2865 static int __init disable_timer_pin_setup(char *arg)
2867 disable_timer_pin_1 = 1;
2870 early_param("disable_timer_pin_1", disable_timer_pin_setup);
2872 int timer_through_8259 __initdata;
2875 * This code may look a bit paranoid, but it's supposed to cooperate with
2876 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2877 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2878 * fanatically on his truly buggy board.
2880 * FIXME: really need to revamp this for all platforms.
2882 static inline void __init check_timer(void)
2884 struct irq_desc *desc = irq_to_desc(0);
2885 struct irq_cfg *cfg = get_irq_desc_chip_data(desc);
2886 int node = cpu_to_node(0);
2887 int apic1, pin1, apic2, pin2;
2888 unsigned long flags;
2891 local_irq_save(flags);
2894 * get/set the timer IRQ vector:
2896 legacy_pic->mask(0);
2897 assign_irq_vector(0, cfg, apic->target_cpus());
2900 * As IRQ0 is to be enabled in the 8259A, the virtual
2901 * wire has to be disabled in the local APIC. Also
2902 * timer interrupts need to be acknowledged manually in
2903 * the 8259A for the i82489DX when using the NMI
2904 * watchdog as that APIC treats NMIs as level-triggered.
2905 * The AEOI mode will finish them in the 8259A
2908 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2909 legacy_pic->init(1);
2910 #ifdef CONFIG_X86_32
2914 ver = apic_read(APIC_LVR);
2915 ver = GET_APIC_VERSION(ver);
2916 timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver));
2920 pin1 = find_isa_irq_pin(0, mp_INT);
2921 apic1 = find_isa_irq_apic(0, mp_INT);
2922 pin2 = ioapic_i8259.pin;
2923 apic2 = ioapic_i8259.apic;
2925 apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
2926 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2927 cfg->vector, apic1, pin1, apic2, pin2);
2930 * Some BIOS writers are clueless and report the ExtINTA
2931 * I/O APIC input from the cascaded 8259A as the timer
2932 * interrupt input. So just in case, if only one pin
2933 * was found above, try it both directly and through the
2937 if (intr_remapping_enabled)
2938 panic("BIOS bug: timer not connected to IO-APIC");
2942 } else if (pin2 == -1) {
2949 * Ok, does IRQ0 through the IOAPIC work?
2952 add_pin_to_irq_node(cfg, node, apic1, pin1);
2953 setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
2955 /* for edge trigger, setup_IO_APIC_irq already
2956 * leave it unmasked.
2957 * so only need to unmask if it is level-trigger
2958 * do we really have level trigger timer?
2961 idx = find_irq_entry(apic1, pin1, mp_INT);
2962 if (idx != -1 && irq_trigger(idx))
2965 if (timer_irq_works()) {
2966 if (nmi_watchdog == NMI_IO_APIC) {
2968 legacy_pic->unmask(0);
2970 if (disable_timer_pin_1 > 0)
2971 clear_IO_APIC_pin(0, pin1);
2974 if (intr_remapping_enabled)
2975 panic("timer doesn't work through Interrupt-remapped IO-APIC");
2976 local_irq_disable();
2977 clear_IO_APIC_pin(apic1, pin1);
2979 apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
2980 "8254 timer not connected to IO-APIC\n");
2982 apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
2983 "(IRQ0) through the 8259A ...\n");
2984 apic_printk(APIC_QUIET, KERN_INFO
2985 "..... (found apic %d pin %d) ...\n", apic2, pin2);
2987 * legacy devices should be connected to IO APIC #0
2989 replace_pin_at_irq_node(cfg, node, apic1, pin1, apic2, pin2);
2990 setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
2991 legacy_pic->unmask(0);
2992 if (timer_irq_works()) {
2993 apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
2994 timer_through_8259 = 1;
2995 if (nmi_watchdog == NMI_IO_APIC) {
2996 legacy_pic->mask(0);
2998 legacy_pic->unmask(0);
3003 * Cleanup, just in case ...
3005 local_irq_disable();
3006 legacy_pic->mask(0);
3007 clear_IO_APIC_pin(apic2, pin2);
3008 apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
3011 if (nmi_watchdog == NMI_IO_APIC) {
3012 apic_printk(APIC_QUIET, KERN_WARNING "timer doesn't work "
3013 "through the IO-APIC - disabling NMI Watchdog!\n");
3014 nmi_watchdog = NMI_NONE;
3016 #ifdef CONFIG_X86_32
3020 apic_printk(APIC_QUIET, KERN_INFO
3021 "...trying to set up timer as Virtual Wire IRQ...\n");
3023 lapic_register_intr(0, desc);
3024 apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
3025 legacy_pic->unmask(0);
3027 if (timer_irq_works()) {
3028 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
3031 local_irq_disable();
3032 legacy_pic->mask(0);
3033 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
3034 apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
3036 apic_printk(APIC_QUIET, KERN_INFO
3037 "...trying to set up timer as ExtINT IRQ...\n");
3039 legacy_pic->init(0);
3040 legacy_pic->make_irq(0);
3041 apic_write(APIC_LVT0, APIC_DM_EXTINT);
3043 unlock_ExtINT_logic();
3045 if (timer_irq_works()) {
3046 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
3049 local_irq_disable();
3050 apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
3051 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
3052 "report. Then try booting with the 'noapic' option.\n");
3054 local_irq_restore(flags);
3058 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
3059 * to devices. However there may be an I/O APIC pin available for
3060 * this interrupt regardless. The pin may be left unconnected, but
3061 * typically it will be reused as an ExtINT cascade interrupt for
3062 * the master 8259A. In the MPS case such a pin will normally be
3063 * reported as an ExtINT interrupt in the MP table. With ACPI
3064 * there is no provision for ExtINT interrupts, and in the absence
3065 * of an override it would be treated as an ordinary ISA I/O APIC
3066 * interrupt, that is edge-triggered and unmasked by default. We
3067 * used to do this, but it caused problems on some systems because
3068 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
3069 * the same ExtINT cascade interrupt to drive the local APIC of the
3070 * bootstrap processor. Therefore we refrain from routing IRQ2 to
3071 * the I/O APIC in all cases now. No actual device should request
3072 * it anyway. --macro
3074 #define PIC_IRQS (1UL << PIC_CASCADE_IR)
3076 void __init setup_IO_APIC(void)
3080 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
3082 io_apic_irqs = legacy_pic->nr_legacy_irqs ? ~PIC_IRQS : ~0UL;
3084 apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
3086 * Set up IO-APIC IRQ routing.
3088 x86_init.mpparse.setup_ioapic_ids();
3091 setup_IO_APIC_irqs();
3092 init_IO_APIC_traps();
3093 if (legacy_pic->nr_legacy_irqs)
3098 * Called after all the initialization is done. If we didnt find any
3099 * APIC bugs then we can allow the modify fast path
3102 static int __init io_apic_bug_finalize(void)
3104 if (sis_apic_bug == -1)
3109 late_initcall(io_apic_bug_finalize);
3111 struct sysfs_ioapic_data {
3112 struct sys_device dev;
3113 struct IO_APIC_route_entry entry[0];
3115 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
3117 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
3119 struct IO_APIC_route_entry *entry;
3120 struct sysfs_ioapic_data *data;
3123 data = container_of(dev, struct sysfs_ioapic_data, dev);
3124 entry = data->entry;
3125 for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
3126 *entry = ioapic_read_entry(dev->id, i);
3131 static int ioapic_resume(struct sys_device *dev)
3133 struct IO_APIC_route_entry *entry;
3134 struct sysfs_ioapic_data *data;
3135 unsigned long flags;
3136 union IO_APIC_reg_00 reg_00;
3139 data = container_of(dev, struct sysfs_ioapic_data, dev);
3140 entry = data->entry;
3142 raw_spin_lock_irqsave(&ioapic_lock, flags);
3143 reg_00.raw = io_apic_read(dev->id, 0);
3144 if (reg_00.bits.ID != mp_ioapics[dev->id].apicid) {
3145 reg_00.bits.ID = mp_ioapics[dev->id].apicid;
3146 io_apic_write(dev->id, 0, reg_00.raw);
3148 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
3149 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
3150 ioapic_write_entry(dev->id, i, entry[i]);
3155 static struct sysdev_class ioapic_sysdev_class = {
3157 .suspend = ioapic_suspend,
3158 .resume = ioapic_resume,
3161 static int __init ioapic_init_sysfs(void)
3163 struct sys_device * dev;
3166 error = sysdev_class_register(&ioapic_sysdev_class);
3170 for (i = 0; i < nr_ioapics; i++ ) {
3171 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
3172 * sizeof(struct IO_APIC_route_entry);
3173 mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
3174 if (!mp_ioapic_data[i]) {
3175 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
3178 dev = &mp_ioapic_data[i]->dev;
3180 dev->cls = &ioapic_sysdev_class;
3181 error = sysdev_register(dev);
3183 kfree(mp_ioapic_data[i]);
3184 mp_ioapic_data[i] = NULL;
3185 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
3193 device_initcall(ioapic_init_sysfs);
3196 * Dynamic irq allocate and deallocation
3198 unsigned int create_irq_nr(unsigned int irq_want, int node)
3200 /* Allocate an unused irq */
3203 unsigned long flags;
3204 struct irq_cfg *cfg_new = NULL;
3205 struct irq_desc *desc_new = NULL;
3208 if (irq_want < nr_irqs_gsi)
3209 irq_want = nr_irqs_gsi;
3211 raw_spin_lock_irqsave(&vector_lock, flags);
3212 for (new = irq_want; new < nr_irqs; new++) {
3213 desc_new = irq_to_desc_alloc_node(new, node);
3215 printk(KERN_INFO "can not get irq_desc for %d\n", new);
3218 cfg_new = get_irq_desc_chip_data(desc_new);
3220 if (cfg_new->vector != 0)
3223 desc_new = move_irq_desc(desc_new, node);
3224 cfg_new = get_irq_desc_chip_data(desc_new);
3226 if (__assign_irq_vector(new, cfg_new, apic->target_cpus()) == 0)
3230 raw_spin_unlock_irqrestore(&vector_lock, flags);
3233 dynamic_irq_init_keep_chip_data(irq);
3238 int create_irq(void)
3240 int node = cpu_to_node(0);
3241 unsigned int irq_want;
3244 irq_want = nr_irqs_gsi;
3245 irq = create_irq_nr(irq_want, node);
3253 void destroy_irq(unsigned int irq)
3255 unsigned long flags;
3257 dynamic_irq_cleanup_keep_chip_data(irq);
3260 raw_spin_lock_irqsave(&vector_lock, flags);
3261 __clear_irq_vector(irq, get_irq_chip_data(irq));
3262 raw_spin_unlock_irqrestore(&vector_lock, flags);
3266 * MSI message composition
3268 #ifdef CONFIG_PCI_MSI
3269 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
3270 struct msi_msg *msg, u8 hpet_id)
3272 struct irq_cfg *cfg;
3280 err = assign_irq_vector(irq, cfg, apic->target_cpus());
3284 dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
3286 if (irq_remapped(irq)) {
3291 ir_index = map_irq_to_irte_handle(irq, &sub_handle);
3292 BUG_ON(ir_index == -1);
3294 prepare_irte(&irte, cfg->vector, dest);
3296 /* Set source-id of interrupt request */
3298 set_msi_sid(&irte, pdev);
3300 set_hpet_sid(&irte, hpet_id);
3302 modify_irte(irq, &irte);
3304 msg->address_hi = MSI_ADDR_BASE_HI;
3305 msg->data = sub_handle;
3306 msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
3308 MSI_ADDR_IR_INDEX1(ir_index) |
3309 MSI_ADDR_IR_INDEX2(ir_index);
3311 if (x2apic_enabled())
3312 msg->address_hi = MSI_ADDR_BASE_HI |
3313 MSI_ADDR_EXT_DEST_ID(dest);
3315 msg->address_hi = MSI_ADDR_BASE_HI;
3319 ((apic->irq_dest_mode == 0) ?
3320 MSI_ADDR_DEST_MODE_PHYSICAL:
3321 MSI_ADDR_DEST_MODE_LOGICAL) |
3322 ((apic->irq_delivery_mode != dest_LowestPrio) ?
3323 MSI_ADDR_REDIRECTION_CPU:
3324 MSI_ADDR_REDIRECTION_LOWPRI) |
3325 MSI_ADDR_DEST_ID(dest);
3328 MSI_DATA_TRIGGER_EDGE |
3329 MSI_DATA_LEVEL_ASSERT |
3330 ((apic->irq_delivery_mode != dest_LowestPrio) ?
3331 MSI_DATA_DELIVERY_FIXED:
3332 MSI_DATA_DELIVERY_LOWPRI) |
3333 MSI_DATA_VECTOR(cfg->vector);
3339 static int set_msi_irq_affinity(unsigned int irq, const struct cpumask *mask)
3341 struct irq_desc *desc = irq_to_desc(irq);
3342 struct irq_cfg *cfg;
3346 if (set_desc_affinity(desc, mask, &dest))
3349 cfg = get_irq_desc_chip_data(desc);
3351 __get_cached_msi_msg(desc->irq_data.msi_desc, &msg);
3353 msg.data &= ~MSI_DATA_VECTOR_MASK;
3354 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3355 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3356 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3358 __write_msi_msg(desc->irq_data.msi_desc, &msg);
3362 #ifdef CONFIG_INTR_REMAP
3364 * Migrate the MSI irq to another cpumask. This migration is
3365 * done in the process context using interrupt-remapping hardware.
3368 ir_set_msi_irq_affinity(unsigned int irq, const struct cpumask *mask)
3370 struct irq_desc *desc = irq_to_desc(irq);
3371 struct irq_cfg *cfg = get_irq_desc_chip_data(desc);
3375 if (get_irte(irq, &irte))
3378 if (set_desc_affinity(desc, mask, &dest))
3381 irte.vector = cfg->vector;
3382 irte.dest_id = IRTE_DEST(dest);
3385 * atomically update the IRTE with the new destination and vector.
3387 modify_irte(irq, &irte);
3390 * After this point, all the interrupts will start arriving
3391 * at the new destination. So, time to cleanup the previous
3392 * vector allocation.
3394 if (cfg->move_in_progress)
3395 send_cleanup_vector(cfg);
3401 #endif /* CONFIG_SMP */
3404 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
3405 * which implement the MSI or MSI-X Capability Structure.
3407 static struct irq_chip msi_chip = {
3409 .irq_unmask = unmask_msi_irq,
3410 .irq_mask = mask_msi_irq,
3411 .irq_ack = ack_apic_edge,
3413 .set_affinity = set_msi_irq_affinity,
3415 .irq_retrigger = ioapic_retrigger_irq,
3418 static struct irq_chip msi_ir_chip = {
3419 .name = "IR-PCI-MSI",
3420 .irq_unmask = unmask_msi_irq,
3421 .irq_mask = mask_msi_irq,
3422 #ifdef CONFIG_INTR_REMAP
3423 .irq_ack = ir_ack_apic_edge,
3425 .set_affinity = ir_set_msi_irq_affinity,
3428 .irq_retrigger = ioapic_retrigger_irq,
3432 * Map the PCI dev to the corresponding remapping hardware unit
3433 * and allocate 'nvec' consecutive interrupt-remapping table entries
3436 static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
3438 struct intel_iommu *iommu;
3441 iommu = map_dev_to_ir(dev);
3444 "Unable to map PCI %s to iommu\n", pci_name(dev));
3448 index = alloc_irte(iommu, irq, nvec);
3451 "Unable to allocate %d IRTE for PCI %s\n", nvec,
3458 static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
3463 ret = msi_compose_msg(dev, irq, &msg, -1);
3467 set_irq_msi(irq, msidesc);
3468 write_msi_msg(irq, &msg);
3470 if (irq_remapped(irq)) {
3471 struct irq_desc *desc = irq_to_desc(irq);
3473 * irq migration in process context
3475 desc->status |= IRQ_MOVE_PCNTXT;
3476 set_irq_chip_and_handler_name(irq, &msi_ir_chip, handle_edge_irq, "edge");
3478 set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
3480 dev_printk(KERN_DEBUG, &dev->dev, "irq %d for MSI/MSI-X\n", irq);
3485 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
3488 int ret, sub_handle;
3489 struct msi_desc *msidesc;
3490 unsigned int irq_want;
3491 struct intel_iommu *iommu = NULL;
3495 /* x86 doesn't support multiple MSI yet */
3496 if (type == PCI_CAP_ID_MSI && nvec > 1)
3499 node = dev_to_node(&dev->dev);
3500 irq_want = nr_irqs_gsi;
3502 list_for_each_entry(msidesc, &dev->msi_list, list) {
3503 irq = create_irq_nr(irq_want, node);
3507 if (!intr_remapping_enabled)
3512 * allocate the consecutive block of IRTE's
3515 index = msi_alloc_irte(dev, irq, nvec);
3521 iommu = map_dev_to_ir(dev);
3527 * setup the mapping between the irq and the IRTE
3528 * base index, the sub_handle pointing to the
3529 * appropriate interrupt remap table entry.
3531 set_irte_irq(irq, iommu, index, sub_handle);
3534 ret = setup_msi_irq(dev, msidesc, irq);
3546 void arch_teardown_msi_irq(unsigned int irq)
3551 #if defined (CONFIG_DMAR) || defined (CONFIG_INTR_REMAP)
3553 static int dmar_msi_set_affinity(unsigned int irq, const struct cpumask *mask)
3555 struct irq_desc *desc = irq_to_desc(irq);
3556 struct irq_cfg *cfg;
3560 if (set_desc_affinity(desc, mask, &dest))
3563 cfg = get_irq_desc_chip_data(desc);
3565 dmar_msi_read(irq, &msg);
3567 msg.data &= ~MSI_DATA_VECTOR_MASK;
3568 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3569 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3570 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3572 dmar_msi_write(irq, &msg);
3577 #endif /* CONFIG_SMP */
3579 static struct irq_chip dmar_msi_type = {
3581 .irq_unmask = dmar_msi_unmask,
3582 .irq_mask = dmar_msi_mask,
3583 .irq_ack = ack_apic_edge,
3585 .set_affinity = dmar_msi_set_affinity,
3587 .irq_retrigger = ioapic_retrigger_irq,
3590 int arch_setup_dmar_msi(unsigned int irq)
3595 ret = msi_compose_msg(NULL, irq, &msg, -1);
3598 dmar_msi_write(irq, &msg);
3599 set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
3605 #ifdef CONFIG_HPET_TIMER
3608 static int hpet_msi_set_affinity(struct irq_data *data,
3609 const struct cpumask *mask, bool force)
3611 struct irq_desc *desc = irq_to_desc(data->irq);
3612 struct irq_cfg *cfg = data->chip_data;
3616 if (set_desc_affinity(desc, mask, &dest))
3619 hpet_msi_read(data->handler_data, &msg);
3621 msg.data &= ~MSI_DATA_VECTOR_MASK;
3622 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3623 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3624 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3626 hpet_msi_write(data->handler_data, &msg);
3631 #endif /* CONFIG_SMP */
3633 static struct irq_chip ir_hpet_msi_type = {
3634 .name = "IR-HPET_MSI",
3635 .irq_unmask = hpet_msi_unmask,
3636 .irq_mask = hpet_msi_mask,
3637 #ifdef CONFIG_INTR_REMAP
3638 .irq_ack = ir_ack_apic_edge,
3640 .set_affinity = ir_set_msi_irq_affinity,
3643 .irq_retrigger = ioapic_retrigger_irq,
3646 static struct irq_chip hpet_msi_type = {
3648 .irq_unmask = hpet_msi_unmask,
3649 .irq_mask = hpet_msi_mask,
3650 .irq_ack = ack_apic_edge,
3652 .irq_set_affinity = hpet_msi_set_affinity,
3654 .irq_retrigger = ioapic_retrigger_irq,
3657 int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
3662 if (intr_remapping_enabled) {
3663 struct intel_iommu *iommu = map_hpet_to_ir(id);
3669 index = alloc_irte(iommu, irq, 1);
3674 ret = msi_compose_msg(NULL, irq, &msg, id);
3678 hpet_msi_write(get_irq_data(irq), &msg);
3679 irq_set_status_flags(irq,IRQ_MOVE_PCNTXT);
3680 if (irq_remapped(irq))
3681 set_irq_chip_and_handler_name(irq, &ir_hpet_msi_type,
3682 handle_edge_irq, "edge");
3684 set_irq_chip_and_handler_name(irq, &hpet_msi_type,
3685 handle_edge_irq, "edge");
3691 #endif /* CONFIG_PCI_MSI */
3693 * Hypertransport interrupt support
3695 #ifdef CONFIG_HT_IRQ
3699 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
3701 struct ht_irq_msg msg;
3702 fetch_ht_irq_msg(irq, &msg);
3704 msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
3705 msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
3707 msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
3708 msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
3710 write_ht_irq_msg(irq, &msg);
3713 static int set_ht_irq_affinity(unsigned int irq, const struct cpumask *mask)
3715 struct irq_desc *desc = irq_to_desc(irq);
3716 struct irq_cfg *cfg;
3719 if (set_desc_affinity(desc, mask, &dest))
3722 cfg = get_irq_desc_chip_data(desc);
3724 target_ht_irq(irq, dest, cfg->vector);
3731 static struct irq_chip ht_irq_chip = {
3733 .mask = mask_ht_irq,
3734 .unmask = unmask_ht_irq,
3735 .irq_ack = ack_apic_edge,
3737 .set_affinity = set_ht_irq_affinity,
3739 .irq_retrigger = ioapic_retrigger_irq,
3742 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
3744 struct irq_cfg *cfg;
3751 err = assign_irq_vector(irq, cfg, apic->target_cpus());
3753 struct ht_irq_msg msg;
3756 dest = apic->cpu_mask_to_apicid_and(cfg->domain,
3757 apic->target_cpus());
3759 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
3763 HT_IRQ_LOW_DEST_ID(dest) |
3764 HT_IRQ_LOW_VECTOR(cfg->vector) |
3765 ((apic->irq_dest_mode == 0) ?
3766 HT_IRQ_LOW_DM_PHYSICAL :
3767 HT_IRQ_LOW_DM_LOGICAL) |
3768 HT_IRQ_LOW_RQEOI_EDGE |
3769 ((apic->irq_delivery_mode != dest_LowestPrio) ?
3770 HT_IRQ_LOW_MT_FIXED :
3771 HT_IRQ_LOW_MT_ARBITRATED) |
3772 HT_IRQ_LOW_IRQ_MASKED;
3774 write_ht_irq_msg(irq, &msg);
3776 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
3777 handle_edge_irq, "edge");
3779 dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq);
3783 #endif /* CONFIG_HT_IRQ */
3785 int __init io_apic_get_redir_entries (int ioapic)
3787 union IO_APIC_reg_01 reg_01;
3788 unsigned long flags;
3790 raw_spin_lock_irqsave(&ioapic_lock, flags);
3791 reg_01.raw = io_apic_read(ioapic, 1);
3792 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
3794 /* The register returns the maximum index redir index
3795 * supported, which is one less than the total number of redir
3798 return reg_01.bits.entries + 1;
3801 void __init probe_nr_irqs_gsi(void)
3805 nr = gsi_top + NR_IRQS_LEGACY;
3806 if (nr > nr_irqs_gsi)
3809 printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
3812 #ifdef CONFIG_SPARSE_IRQ
3813 int __init arch_probe_nr_irqs(void)
3817 if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
3818 nr_irqs = NR_VECTORS * nr_cpu_ids;
3820 nr = nr_irqs_gsi + 8 * nr_cpu_ids;
3821 #if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
3823 * for MSI and HT dyn irq
3825 nr += nr_irqs_gsi * 16;
3830 return NR_IRQS_LEGACY;
3834 static int __io_apic_set_pci_routing(struct device *dev, int irq,
3835 struct io_apic_irq_attr *irq_attr)
3837 struct irq_desc *desc;
3838 struct irq_cfg *cfg;
3841 int trigger, polarity;
3843 ioapic = irq_attr->ioapic;
3844 if (!IO_APIC_IRQ(irq)) {
3845 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
3851 node = dev_to_node(dev);
3853 node = cpu_to_node(0);
3855 desc = irq_to_desc_alloc_node(irq, node);
3857 printk(KERN_INFO "can not get irq_desc %d\n", irq);
3861 pin = irq_attr->ioapic_pin;
3862 trigger = irq_attr->trigger;
3863 polarity = irq_attr->polarity;
3866 * IRQs < 16 are already in the irq_2_pin[] map
3868 if (irq >= legacy_pic->nr_legacy_irqs) {
3869 cfg = get_irq_desc_chip_data(desc);
3870 if (add_pin_to_irq_node_nopanic(cfg, node, ioapic, pin)) {
3871 printk(KERN_INFO "can not add pin %d for irq %d\n",
3877 setup_IO_APIC_irq(ioapic, pin, irq, desc, trigger, polarity);
3882 int io_apic_set_pci_routing(struct device *dev, int irq,
3883 struct io_apic_irq_attr *irq_attr)
3887 * Avoid pin reprogramming. PRTs typically include entries
3888 * with redundant pin->gsi mappings (but unique PCI devices);
3889 * we only program the IOAPIC on the first.
3891 ioapic = irq_attr->ioapic;
3892 pin = irq_attr->ioapic_pin;
3893 if (test_bit(pin, mp_ioapic_routing[ioapic].pin_programmed)) {
3894 pr_debug("Pin %d-%d already programmed\n",
3895 mp_ioapics[ioapic].apicid, pin);
3898 set_bit(pin, mp_ioapic_routing[ioapic].pin_programmed);
3900 return __io_apic_set_pci_routing(dev, irq, irq_attr);
3903 u8 __init io_apic_unique_id(u8 id)
3905 #ifdef CONFIG_X86_32
3906 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
3907 !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
3908 return io_apic_get_unique_id(nr_ioapics, id);
3913 DECLARE_BITMAP(used, 256);
3915 bitmap_zero(used, 256);
3916 for (i = 0; i < nr_ioapics; i++) {
3917 struct mpc_ioapic *ia = &mp_ioapics[i];
3918 __set_bit(ia->apicid, used);
3920 if (!test_bit(id, used))
3922 return find_first_zero_bit(used, 256);
3926 #ifdef CONFIG_X86_32
3927 int __init io_apic_get_unique_id(int ioapic, int apic_id)
3929 union IO_APIC_reg_00 reg_00;
3930 static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
3932 unsigned long flags;
3936 * The P4 platform supports up to 256 APIC IDs on two separate APIC
3937 * buses (one for LAPICs, one for IOAPICs), where predecessors only
3938 * supports up to 16 on one shared APIC bus.
3940 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
3941 * advantage of new APIC bus architecture.
3944 if (physids_empty(apic_id_map))
3945 apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);
3947 raw_spin_lock_irqsave(&ioapic_lock, flags);
3948 reg_00.raw = io_apic_read(ioapic, 0);
3949 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
3951 if (apic_id >= get_physical_broadcast()) {
3952 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
3953 "%d\n", ioapic, apic_id, reg_00.bits.ID);
3954 apic_id = reg_00.bits.ID;
3958 * Every APIC in a system must have a unique ID or we get lots of nice
3959 * 'stuck on smp_invalidate_needed IPI wait' messages.
3961 if (apic->check_apicid_used(&apic_id_map, apic_id)) {
3963 for (i = 0; i < get_physical_broadcast(); i++) {
3964 if (!apic->check_apicid_used(&apic_id_map, i))
3968 if (i == get_physical_broadcast())
3969 panic("Max apic_id exceeded!\n");
3971 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
3972 "trying %d\n", ioapic, apic_id, i);
3977 apic->apicid_to_cpu_present(apic_id, &tmp);
3978 physids_or(apic_id_map, apic_id_map, tmp);
3980 if (reg_00.bits.ID != apic_id) {
3981 reg_00.bits.ID = apic_id;
3983 raw_spin_lock_irqsave(&ioapic_lock, flags);
3984 io_apic_write(ioapic, 0, reg_00.raw);
3985 reg_00.raw = io_apic_read(ioapic, 0);
3986 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
3989 if (reg_00.bits.ID != apic_id) {
3990 printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
3995 apic_printk(APIC_VERBOSE, KERN_INFO
3996 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
4002 int __init io_apic_get_version(int ioapic)
4004 union IO_APIC_reg_01 reg_01;
4005 unsigned long flags;
4007 raw_spin_lock_irqsave(&ioapic_lock, flags);
4008 reg_01.raw = io_apic_read(ioapic, 1);
4009 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
4011 return reg_01.bits.version;
4014 int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
4016 int ioapic, pin, idx;
4018 if (skip_ioapic_setup)
4021 ioapic = mp_find_ioapic(gsi);
4025 pin = mp_find_ioapic_pin(ioapic, gsi);
4029 idx = find_irq_entry(ioapic, pin, mp_INT);
4033 *trigger = irq_trigger(idx);
4034 *polarity = irq_polarity(idx);
4039 * This function currently is only a helper for the i386 smp boot process where
4040 * we need to reprogram the ioredtbls to cater for the cpus which have come online
4041 * so mask in all cases should simply be apic->target_cpus()
4044 void __init setup_ioapic_dest(void)
4046 int pin, ioapic, irq, irq_entry;
4047 struct irq_desc *desc;
4048 const struct cpumask *mask;
4050 if (skip_ioapic_setup == 1)
4053 for (ioapic = 0; ioapic < nr_ioapics; ioapic++)
4054 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
4055 irq_entry = find_irq_entry(ioapic, pin, mp_INT);
4056 if (irq_entry == -1)
4058 irq = pin_2_irq(irq_entry, ioapic, pin);
4060 if ((ioapic > 0) && (irq > 16))
4063 desc = irq_to_desc(irq);
4066 * Honour affinities which have been set in early boot
4069 (IRQ_NO_BALANCING | IRQ_AFFINITY_SET))
4070 mask = desc->affinity;
4072 mask = apic->target_cpus();
4074 if (intr_remapping_enabled)
4075 set_ir_ioapic_affinity_irq_desc(desc, mask);
4077 set_ioapic_affinity_irq_desc(desc, mask);
4083 #define IOAPIC_RESOURCE_NAME_SIZE 11
4085 static struct resource *ioapic_resources;
4087 static struct resource * __init ioapic_setup_resources(int nr_ioapics)
4090 struct resource *res;
4094 if (nr_ioapics <= 0)
4097 n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
4100 mem = alloc_bootmem(n);
4103 mem += sizeof(struct resource) * nr_ioapics;
4105 for (i = 0; i < nr_ioapics; i++) {
4107 res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
4108 snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
4109 mem += IOAPIC_RESOURCE_NAME_SIZE;
4112 ioapic_resources = res;
4117 void __init ioapic_init_mappings(void)
4119 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
4120 struct resource *ioapic_res;
4123 ioapic_res = ioapic_setup_resources(nr_ioapics);
4124 for (i = 0; i < nr_ioapics; i++) {
4125 if (smp_found_config) {
4126 ioapic_phys = mp_ioapics[i].apicaddr;
4127 #ifdef CONFIG_X86_32
4130 "WARNING: bogus zero IO-APIC "
4131 "address found in MPTABLE, "
4132 "disabling IO/APIC support!\n");
4133 smp_found_config = 0;
4134 skip_ioapic_setup = 1;
4135 goto fake_ioapic_page;
4139 #ifdef CONFIG_X86_32
4142 ioapic_phys = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
4143 ioapic_phys = __pa(ioapic_phys);
4145 set_fixmap_nocache(idx, ioapic_phys);
4146 apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n",
4147 __fix_to_virt(idx) + (ioapic_phys & ~PAGE_MASK),
4151 ioapic_res->start = ioapic_phys;
4152 ioapic_res->end = ioapic_phys + IO_APIC_SLOT_SIZE - 1;
4157 void __init ioapic_insert_resources(void)
4160 struct resource *r = ioapic_resources;
4165 "IO APIC resources couldn't be allocated.\n");
4169 for (i = 0; i < nr_ioapics; i++) {
4170 insert_resource(&iomem_resource, r);
4175 int mp_find_ioapic(u32 gsi)
4179 /* Find the IOAPIC that manages this GSI. */
4180 for (i = 0; i < nr_ioapics; i++) {
4181 if ((gsi >= mp_gsi_routing[i].gsi_base)
4182 && (gsi <= mp_gsi_routing[i].gsi_end))
4186 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
4190 int mp_find_ioapic_pin(int ioapic, u32 gsi)
4192 if (WARN_ON(ioapic == -1))
4194 if (WARN_ON(gsi > mp_gsi_routing[ioapic].gsi_end))
4197 return gsi - mp_gsi_routing[ioapic].gsi_base;
4200 static int bad_ioapic(unsigned long address)
4202 if (nr_ioapics >= MAX_IO_APICS) {
4203 printk(KERN_WARNING "WARING: Max # of I/O APICs (%d) exceeded "
4204 "(found %d), skipping\n", MAX_IO_APICS, nr_ioapics);
4208 printk(KERN_WARNING "WARNING: Bogus (zero) I/O APIC address"
4209 " found in table, skipping!\n");
4215 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
4220 if (bad_ioapic(address))
4225 mp_ioapics[idx].type = MP_IOAPIC;
4226 mp_ioapics[idx].flags = MPC_APIC_USABLE;
4227 mp_ioapics[idx].apicaddr = address;
4229 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
4230 mp_ioapics[idx].apicid = io_apic_unique_id(id);
4231 mp_ioapics[idx].apicver = io_apic_get_version(idx);
4234 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
4235 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
4237 entries = io_apic_get_redir_entries(idx);
4238 mp_gsi_routing[idx].gsi_base = gsi_base;
4239 mp_gsi_routing[idx].gsi_end = gsi_base + entries - 1;
4242 * The number of IO-APIC IRQ registers (== #pins):
4244 nr_ioapic_registers[idx] = entries;
4246 if (mp_gsi_routing[idx].gsi_end >= gsi_top)
4247 gsi_top = mp_gsi_routing[idx].gsi_end + 1;
4249 printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
4250 "GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
4251 mp_ioapics[idx].apicver, mp_ioapics[idx].apicaddr,
4252 mp_gsi_routing[idx].gsi_base, mp_gsi_routing[idx].gsi_end);
4257 /* Enable IOAPIC early just for system timer */
4258 void __init pre_init_apic_IRQ0(void)
4260 struct irq_cfg *cfg;
4261 struct irq_desc *desc;
4263 printk(KERN_INFO "Early APIC setup for system timer0\n");
4265 phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
4267 desc = irq_to_desc_alloc_node(0, 0);
4272 add_pin_to_irq_node(cfg, 0, 0, 0);
4273 set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
4275 setup_IO_APIC_irq(0, 0, 0, desc, 0, 0);