2 * Intel IO-APIC support for multi-Pentium hosts.
4 * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
6 * Many thanks to Stig Venaas for trying out countless experimental
7 * patches and reporting/debugging problems patiently!
9 * (c) 1999, Multiple IO-APIC support, developed by
10 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
11 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
12 * further tested and cleaned up by Zach Brown <zab@redhat.com>
13 * and Ingo Molnar <mingo@redhat.com>
16 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
17 * thanks to Eric Gilmore
19 * for testing these extensively
20 * Paul Diefenbaugh : Added full ACPI support
24 #include <linux/interrupt.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/sched.h>
28 #include <linux/pci.h>
29 #include <linux/mc146818rtc.h>
30 #include <linux/compiler.h>
31 #include <linux/acpi.h>
32 #include <linux/module.h>
33 #include <linux/sysdev.h>
34 #include <linux/msi.h>
35 #include <linux/htirq.h>
36 #include <linux/freezer.h>
37 #include <linux/kthread.h>
38 #include <linux/jiffies.h> /* time_after() */
40 #include <acpi/acpi_bus.h>
42 #include <linux/bootmem.h>
43 #include <linux/dmar.h>
44 #include <linux/hpet.h>
51 #include <asm/proto.h>
54 #include <asm/timer.h>
55 #include <asm/i8259.h>
57 #include <asm/msidef.h>
58 #include <asm/hypertransport.h>
59 #include <asm/setup.h>
60 #include <asm/irq_remapping.h>
62 #include <asm/hw_irq.h>
63 #include <asm/uv/uv_hub.h>
64 #include <asm/uv/uv_irq.h>
68 #define __apicdebuginit(type) static type __init
71 * Is the SiS APIC rmw bug present ?
72 * -1 = don't know, 0 = no, 1 = yes
74 int sis_apic_bug = -1;
76 static DEFINE_SPINLOCK(ioapic_lock);
77 static DEFINE_SPINLOCK(vector_lock);
80 * # of IRQ routing registers
82 int nr_ioapic_registers[MAX_IO_APICS];
84 /* I/O APIC entries */
85 struct mpc_ioapic mp_ioapics[MAX_IO_APICS];
88 /* MP IRQ source entries */
89 struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
91 /* # of MP IRQ source entries */
94 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
95 int mp_bus_id_to_type[MAX_MP_BUSSES];
98 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
100 int skip_ioapic_setup;
102 void arch_disable_smp_support(void)
106 noioapicreroute = -1;
108 skip_ioapic_setup = 1;
111 static int __init parse_noapic(char *str)
113 /* disable IO-APIC */
114 arch_disable_smp_support();
117 early_param("noapic", parse_noapic);
122 * This is performance-critical, we want to do it O(1)
124 * the indexing order of this array favors 1:1 mappings
125 * between pins and IRQs.
128 struct irq_pin_list {
130 struct irq_pin_list *next;
133 static struct irq_pin_list *get_one_free_irq_2_pin(int node)
135 struct irq_pin_list *pin;
137 pin = kzalloc_node(sizeof(*pin), GFP_ATOMIC, node);
143 struct irq_pin_list *irq_2_pin;
144 cpumask_var_t domain;
145 cpumask_var_t old_domain;
146 unsigned move_cleanup_count;
148 u8 move_in_progress : 1;
151 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
152 #ifdef CONFIG_SPARSE_IRQ
153 static struct irq_cfg irq_cfgx[] = {
155 static struct irq_cfg irq_cfgx[NR_IRQS] = {
157 [0] = { .vector = IRQ0_VECTOR, },
158 [1] = { .vector = IRQ1_VECTOR, },
159 [2] = { .vector = IRQ2_VECTOR, },
160 [3] = { .vector = IRQ3_VECTOR, },
161 [4] = { .vector = IRQ4_VECTOR, },
162 [5] = { .vector = IRQ5_VECTOR, },
163 [6] = { .vector = IRQ6_VECTOR, },
164 [7] = { .vector = IRQ7_VECTOR, },
165 [8] = { .vector = IRQ8_VECTOR, },
166 [9] = { .vector = IRQ9_VECTOR, },
167 [10] = { .vector = IRQ10_VECTOR, },
168 [11] = { .vector = IRQ11_VECTOR, },
169 [12] = { .vector = IRQ12_VECTOR, },
170 [13] = { .vector = IRQ13_VECTOR, },
171 [14] = { .vector = IRQ14_VECTOR, },
172 [15] = { .vector = IRQ15_VECTOR, },
175 int __init arch_early_irq_init(void)
178 struct irq_desc *desc;
184 count = ARRAY_SIZE(irq_cfgx);
185 node= cpu_to_node(boot_cpu_id);
187 for (i = 0; i < count; i++) {
188 desc = irq_to_desc(i);
189 desc->chip_data = &cfg[i];
190 zalloc_cpumask_var_node(&cfg[i].domain, GFP_NOWAIT, node);
191 zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_NOWAIT, node);
192 if (i < NR_IRQS_LEGACY)
193 cpumask_setall(cfg[i].domain);
199 #ifdef CONFIG_SPARSE_IRQ
200 static struct irq_cfg *irq_cfg(unsigned int irq)
202 struct irq_cfg *cfg = NULL;
203 struct irq_desc *desc;
205 desc = irq_to_desc(irq);
207 cfg = desc->chip_data;
212 static struct irq_cfg *get_one_free_irq_cfg(int node)
216 cfg = kzalloc_node(sizeof(*cfg), GFP_ATOMIC, node);
218 if (!alloc_cpumask_var_node(&cfg->domain, GFP_ATOMIC, node)) {
221 } else if (!alloc_cpumask_var_node(&cfg->old_domain,
223 free_cpumask_var(cfg->domain);
227 cpumask_clear(cfg->domain);
228 cpumask_clear(cfg->old_domain);
235 int arch_init_chip_data(struct irq_desc *desc, int node)
239 cfg = desc->chip_data;
241 desc->chip_data = get_one_free_irq_cfg(node);
242 if (!desc->chip_data) {
243 printk(KERN_ERR "can not alloc irq_cfg\n");
251 /* for move_irq_desc */
253 init_copy_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg, int node)
255 struct irq_pin_list *old_entry, *head, *tail, *entry;
257 cfg->irq_2_pin = NULL;
258 old_entry = old_cfg->irq_2_pin;
262 entry = get_one_free_irq_2_pin(node);
266 entry->apic = old_entry->apic;
267 entry->pin = old_entry->pin;
270 old_entry = old_entry->next;
272 entry = get_one_free_irq_2_pin(node);
280 /* still use the old one */
283 entry->apic = old_entry->apic;
284 entry->pin = old_entry->pin;
287 old_entry = old_entry->next;
291 cfg->irq_2_pin = head;
294 static void free_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg)
296 struct irq_pin_list *entry, *next;
298 if (old_cfg->irq_2_pin == cfg->irq_2_pin)
301 entry = old_cfg->irq_2_pin;
308 old_cfg->irq_2_pin = NULL;
311 void arch_init_copy_chip_data(struct irq_desc *old_desc,
312 struct irq_desc *desc, int node)
315 struct irq_cfg *old_cfg;
317 cfg = get_one_free_irq_cfg(node);
322 desc->chip_data = cfg;
324 old_cfg = old_desc->chip_data;
326 memcpy(cfg, old_cfg, sizeof(struct irq_cfg));
328 init_copy_irq_2_pin(old_cfg, cfg, node);
331 static void free_irq_cfg(struct irq_cfg *old_cfg)
336 void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc)
338 struct irq_cfg *old_cfg, *cfg;
340 old_cfg = old_desc->chip_data;
341 cfg = desc->chip_data;
347 free_irq_2_pin(old_cfg, cfg);
348 free_irq_cfg(old_cfg);
349 old_desc->chip_data = NULL;
352 /* end for move_irq_desc */
355 static struct irq_cfg *irq_cfg(unsigned int irq)
357 return irq < nr_irqs ? irq_cfgx + irq : NULL;
364 unsigned int unused[3];
366 unsigned int unused2[11];
370 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
372 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
373 + (mp_ioapics[idx].apicaddr & ~PAGE_MASK);
376 static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
378 struct io_apic __iomem *io_apic = io_apic_base(apic);
379 writel(vector, &io_apic->eoi);
382 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
384 struct io_apic __iomem *io_apic = io_apic_base(apic);
385 writel(reg, &io_apic->index);
386 return readl(&io_apic->data);
389 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
391 struct io_apic __iomem *io_apic = io_apic_base(apic);
392 writel(reg, &io_apic->index);
393 writel(value, &io_apic->data);
397 * Re-write a value: to be used for read-modify-write
398 * cycles where the read already set up the index register.
400 * Older SiS APIC requires we rewrite the index register
402 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
404 struct io_apic __iomem *io_apic = io_apic_base(apic);
407 writel(reg, &io_apic->index);
408 writel(value, &io_apic->data);
411 static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
413 struct irq_pin_list *entry;
416 spin_lock_irqsave(&ioapic_lock, flags);
417 entry = cfg->irq_2_pin;
425 reg = io_apic_read(entry->apic, 0x10 + pin*2);
426 /* Is the remote IRR bit set? */
427 if (reg & IO_APIC_REDIR_REMOTE_IRR) {
428 spin_unlock_irqrestore(&ioapic_lock, flags);
435 spin_unlock_irqrestore(&ioapic_lock, flags);
441 struct { u32 w1, w2; };
442 struct IO_APIC_route_entry entry;
445 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
447 union entry_union eu;
449 spin_lock_irqsave(&ioapic_lock, flags);
450 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
451 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
452 spin_unlock_irqrestore(&ioapic_lock, flags);
457 * When we write a new IO APIC routing entry, we need to write the high
458 * word first! If the mask bit in the low word is clear, we will enable
459 * the interrupt, and we need to make sure the entry is fully populated
460 * before that happens.
463 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
465 union entry_union eu;
467 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
468 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
471 void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
474 spin_lock_irqsave(&ioapic_lock, flags);
475 __ioapic_write_entry(apic, pin, e);
476 spin_unlock_irqrestore(&ioapic_lock, flags);
480 * When we mask an IO APIC routing entry, we need to write the low
481 * word first, in order to set the mask bit before we change the
484 static void ioapic_mask_entry(int apic, int pin)
487 union entry_union eu = { .entry.mask = 1 };
489 spin_lock_irqsave(&ioapic_lock, flags);
490 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
491 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
492 spin_unlock_irqrestore(&ioapic_lock, flags);
496 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
497 * shared ISA-space IRQs, so we have to support them. We are super
498 * fast in the common case, and fast for shared ISA-space IRQs.
500 static void add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
502 struct irq_pin_list *entry;
504 entry = cfg->irq_2_pin;
506 entry = get_one_free_irq_2_pin(node);
508 printk(KERN_ERR "can not alloc irq_2_pin to add %d - %d\n",
512 cfg->irq_2_pin = entry;
518 while (entry->next) {
519 /* not again, please */
520 if (entry->apic == apic && entry->pin == pin)
526 entry->next = get_one_free_irq_2_pin(node);
533 * Reroute an IRQ to a different pin.
535 static void __init replace_pin_at_irq_node(struct irq_cfg *cfg, int node,
536 int oldapic, int oldpin,
537 int newapic, int newpin)
539 struct irq_pin_list *entry = cfg->irq_2_pin;
543 if (entry->apic == oldapic && entry->pin == oldpin) {
544 entry->apic = newapic;
547 /* every one is different, right? */
553 /* why? call replace before add? */
555 add_pin_to_irq_node(cfg, node, newapic, newpin);
558 static inline void io_apic_modify_irq(struct irq_cfg *cfg,
559 int mask_and, int mask_or,
560 void (*final)(struct irq_pin_list *entry))
563 struct irq_pin_list *entry;
565 for (entry = cfg->irq_2_pin; entry != NULL; entry = entry->next) {
568 reg = io_apic_read(entry->apic, 0x10 + pin * 2);
571 io_apic_modify(entry->apic, 0x10 + pin * 2, reg);
577 static void __unmask_IO_APIC_irq(struct irq_cfg *cfg)
579 io_apic_modify_irq(cfg, ~IO_APIC_REDIR_MASKED, 0, NULL);
583 static void io_apic_sync(struct irq_pin_list *entry)
586 * Synchronize the IO-APIC and the CPU by doing
587 * a dummy read from the IO-APIC
589 struct io_apic __iomem *io_apic;
590 io_apic = io_apic_base(entry->apic);
591 readl(&io_apic->data);
594 static void __mask_IO_APIC_irq(struct irq_cfg *cfg)
596 io_apic_modify_irq(cfg, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
598 #else /* CONFIG_X86_32 */
599 static void __mask_IO_APIC_irq(struct irq_cfg *cfg)
601 io_apic_modify_irq(cfg, ~0, IO_APIC_REDIR_MASKED, NULL);
604 static void __mask_and_edge_IO_APIC_irq(struct irq_cfg *cfg)
606 io_apic_modify_irq(cfg, ~IO_APIC_REDIR_LEVEL_TRIGGER,
607 IO_APIC_REDIR_MASKED, NULL);
610 static void __unmask_and_level_IO_APIC_irq(struct irq_cfg *cfg)
612 io_apic_modify_irq(cfg, ~IO_APIC_REDIR_MASKED,
613 IO_APIC_REDIR_LEVEL_TRIGGER, NULL);
615 #endif /* CONFIG_X86_32 */
617 static void mask_IO_APIC_irq_desc(struct irq_desc *desc)
619 struct irq_cfg *cfg = desc->chip_data;
624 spin_lock_irqsave(&ioapic_lock, flags);
625 __mask_IO_APIC_irq(cfg);
626 spin_unlock_irqrestore(&ioapic_lock, flags);
629 static void unmask_IO_APIC_irq_desc(struct irq_desc *desc)
631 struct irq_cfg *cfg = desc->chip_data;
634 spin_lock_irqsave(&ioapic_lock, flags);
635 __unmask_IO_APIC_irq(cfg);
636 spin_unlock_irqrestore(&ioapic_lock, flags);
639 static void mask_IO_APIC_irq(unsigned int irq)
641 struct irq_desc *desc = irq_to_desc(irq);
643 mask_IO_APIC_irq_desc(desc);
645 static void unmask_IO_APIC_irq(unsigned int irq)
647 struct irq_desc *desc = irq_to_desc(irq);
649 unmask_IO_APIC_irq_desc(desc);
652 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
654 struct IO_APIC_route_entry entry;
656 /* Check delivery_mode to be sure we're not clearing an SMI pin */
657 entry = ioapic_read_entry(apic, pin);
658 if (entry.delivery_mode == dest_SMI)
661 * Disable it in the IO-APIC irq-routing table:
663 ioapic_mask_entry(apic, pin);
666 static void clear_IO_APIC (void)
670 for (apic = 0; apic < nr_ioapics; apic++)
671 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
672 clear_IO_APIC_pin(apic, pin);
677 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
678 * specific CPU-side IRQs.
682 static int pirq_entries[MAX_PIRQS] = {
683 [0 ... MAX_PIRQS - 1] = -1
686 static int __init ioapic_pirq_setup(char *str)
689 int ints[MAX_PIRQS+1];
691 get_options(str, ARRAY_SIZE(ints), ints);
693 apic_printk(APIC_VERBOSE, KERN_INFO
694 "PIRQ redirection, working around broken MP-BIOS.\n");
696 if (ints[0] < MAX_PIRQS)
699 for (i = 0; i < max; i++) {
700 apic_printk(APIC_VERBOSE, KERN_DEBUG
701 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
703 * PIRQs are mapped upside down, usually.
705 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
710 __setup("pirq=", ioapic_pirq_setup);
711 #endif /* CONFIG_X86_32 */
713 struct IO_APIC_route_entry **alloc_ioapic_entries(void)
716 struct IO_APIC_route_entry **ioapic_entries;
718 ioapic_entries = kzalloc(sizeof(*ioapic_entries) * nr_ioapics,
723 for (apic = 0; apic < nr_ioapics; apic++) {
724 ioapic_entries[apic] =
725 kzalloc(sizeof(struct IO_APIC_route_entry) *
726 nr_ioapic_registers[apic], GFP_ATOMIC);
727 if (!ioapic_entries[apic])
731 return ioapic_entries;
735 kfree(ioapic_entries[apic]);
736 kfree(ioapic_entries);
742 * Saves all the IO-APIC RTE's
744 int save_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
751 for (apic = 0; apic < nr_ioapics; apic++) {
752 if (!ioapic_entries[apic])
755 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
756 ioapic_entries[apic][pin] =
757 ioapic_read_entry(apic, pin);
764 * Mask all IO APIC entries.
766 void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
773 for (apic = 0; apic < nr_ioapics; apic++) {
774 if (!ioapic_entries[apic])
777 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
778 struct IO_APIC_route_entry entry;
780 entry = ioapic_entries[apic][pin];
783 ioapic_write_entry(apic, pin, entry);
790 * Restore IO APIC entries which was saved in ioapic_entries.
792 int restore_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
799 for (apic = 0; apic < nr_ioapics; apic++) {
800 if (!ioapic_entries[apic])
803 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
804 ioapic_write_entry(apic, pin,
805 ioapic_entries[apic][pin]);
810 void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries)
814 for (apic = 0; apic < nr_ioapics; apic++)
815 kfree(ioapic_entries[apic]);
817 kfree(ioapic_entries);
821 * Find the IRQ entry number of a certain pin.
823 static int find_irq_entry(int apic, int pin, int type)
827 for (i = 0; i < mp_irq_entries; i++)
828 if (mp_irqs[i].irqtype == type &&
829 (mp_irqs[i].dstapic == mp_ioapics[apic].apicid ||
830 mp_irqs[i].dstapic == MP_APIC_ALL) &&
831 mp_irqs[i].dstirq == pin)
838 * Find the pin to which IRQ[irq] (ISA) is connected
840 static int __init find_isa_irq_pin(int irq, int type)
844 for (i = 0; i < mp_irq_entries; i++) {
845 int lbus = mp_irqs[i].srcbus;
847 if (test_bit(lbus, mp_bus_not_pci) &&
848 (mp_irqs[i].irqtype == type) &&
849 (mp_irqs[i].srcbusirq == irq))
851 return mp_irqs[i].dstirq;
856 static int __init find_isa_irq_apic(int irq, int type)
860 for (i = 0; i < mp_irq_entries; i++) {
861 int lbus = mp_irqs[i].srcbus;
863 if (test_bit(lbus, mp_bus_not_pci) &&
864 (mp_irqs[i].irqtype == type) &&
865 (mp_irqs[i].srcbusirq == irq))
868 if (i < mp_irq_entries) {
870 for(apic = 0; apic < nr_ioapics; apic++) {
871 if (mp_ioapics[apic].apicid == mp_irqs[i].dstapic)
879 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
881 * EISA Edge/Level control register, ELCR
883 static int EISA_ELCR(unsigned int irq)
885 if (irq < NR_IRQS_LEGACY) {
886 unsigned int port = 0x4d0 + (irq >> 3);
887 return (inb(port) >> (irq & 7)) & 1;
889 apic_printk(APIC_VERBOSE, KERN_INFO
890 "Broken MPtable reports ISA irq %d\n", irq);
896 /* ISA interrupts are always polarity zero edge triggered,
897 * when listed as conforming in the MP table. */
899 #define default_ISA_trigger(idx) (0)
900 #define default_ISA_polarity(idx) (0)
902 /* EISA interrupts are always polarity zero and can be edge or level
903 * trigger depending on the ELCR value. If an interrupt is listed as
904 * EISA conforming in the MP table, that means its trigger type must
905 * be read in from the ELCR */
907 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
908 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
910 /* PCI interrupts are always polarity one level triggered,
911 * when listed as conforming in the MP table. */
913 #define default_PCI_trigger(idx) (1)
914 #define default_PCI_polarity(idx) (1)
916 /* MCA interrupts are always polarity zero level triggered,
917 * when listed as conforming in the MP table. */
919 #define default_MCA_trigger(idx) (1)
920 #define default_MCA_polarity(idx) default_ISA_polarity(idx)
922 static int MPBIOS_polarity(int idx)
924 int bus = mp_irqs[idx].srcbus;
928 * Determine IRQ line polarity (high active or low active):
930 switch (mp_irqs[idx].irqflag & 3)
932 case 0: /* conforms, ie. bus-type dependent polarity */
933 if (test_bit(bus, mp_bus_not_pci))
934 polarity = default_ISA_polarity(idx);
936 polarity = default_PCI_polarity(idx);
938 case 1: /* high active */
943 case 2: /* reserved */
945 printk(KERN_WARNING "broken BIOS!!\n");
949 case 3: /* low active */
954 default: /* invalid */
956 printk(KERN_WARNING "broken BIOS!!\n");
964 static int MPBIOS_trigger(int idx)
966 int bus = mp_irqs[idx].srcbus;
970 * Determine IRQ trigger mode (edge or level sensitive):
972 switch ((mp_irqs[idx].irqflag>>2) & 3)
974 case 0: /* conforms, ie. bus-type dependent */
975 if (test_bit(bus, mp_bus_not_pci))
976 trigger = default_ISA_trigger(idx);
978 trigger = default_PCI_trigger(idx);
979 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
980 switch (mp_bus_id_to_type[bus]) {
981 case MP_BUS_ISA: /* ISA pin */
983 /* set before the switch */
986 case MP_BUS_EISA: /* EISA pin */
988 trigger = default_EISA_trigger(idx);
991 case MP_BUS_PCI: /* PCI pin */
993 /* set before the switch */
996 case MP_BUS_MCA: /* MCA pin */
998 trigger = default_MCA_trigger(idx);
1003 printk(KERN_WARNING "broken BIOS!!\n");
1015 case 2: /* reserved */
1017 printk(KERN_WARNING "broken BIOS!!\n");
1026 default: /* invalid */
1028 printk(KERN_WARNING "broken BIOS!!\n");
1036 static inline int irq_polarity(int idx)
1038 return MPBIOS_polarity(idx);
1041 static inline int irq_trigger(int idx)
1043 return MPBIOS_trigger(idx);
1046 int (*ioapic_renumber_irq)(int ioapic, int irq);
1047 static int pin_2_irq(int idx, int apic, int pin)
1050 int bus = mp_irqs[idx].srcbus;
1053 * Debugging check, we are in big trouble if this message pops up!
1055 if (mp_irqs[idx].dstirq != pin)
1056 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
1058 if (test_bit(bus, mp_bus_not_pci)) {
1059 irq = mp_irqs[idx].srcbusirq;
1062 * PCI IRQs are mapped in order
1066 irq += nr_ioapic_registers[i++];
1069 * For MPS mode, so far only needed by ES7000 platform
1071 if (ioapic_renumber_irq)
1072 irq = ioapic_renumber_irq(apic, irq);
1075 #ifdef CONFIG_X86_32
1077 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1079 if ((pin >= 16) && (pin <= 23)) {
1080 if (pirq_entries[pin-16] != -1) {
1081 if (!pirq_entries[pin-16]) {
1082 apic_printk(APIC_VERBOSE, KERN_DEBUG
1083 "disabling PIRQ%d\n", pin-16);
1085 irq = pirq_entries[pin-16];
1086 apic_printk(APIC_VERBOSE, KERN_DEBUG
1087 "using PIRQ%d -> IRQ %d\n",
1098 * Find a specific PCI IRQ entry.
1099 * Not an __init, possibly needed by modules
1101 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
1102 struct io_apic_irq_attr *irq_attr)
1104 int apic, i, best_guess = -1;
1106 apic_printk(APIC_DEBUG,
1107 "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
1109 if (test_bit(bus, mp_bus_not_pci)) {
1110 apic_printk(APIC_VERBOSE,
1111 "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
1114 for (i = 0; i < mp_irq_entries; i++) {
1115 int lbus = mp_irqs[i].srcbus;
1117 for (apic = 0; apic < nr_ioapics; apic++)
1118 if (mp_ioapics[apic].apicid == mp_irqs[i].dstapic ||
1119 mp_irqs[i].dstapic == MP_APIC_ALL)
1122 if (!test_bit(lbus, mp_bus_not_pci) &&
1123 !mp_irqs[i].irqtype &&
1125 (slot == ((mp_irqs[i].srcbusirq >> 2) & 0x1f))) {
1126 int irq = pin_2_irq(i, apic, mp_irqs[i].dstirq);
1128 if (!(apic || IO_APIC_IRQ(irq)))
1131 if (pin == (mp_irqs[i].srcbusirq & 3)) {
1132 set_io_apic_irq_attr(irq_attr, apic,
1139 * Use the first all-but-pin matching entry as a
1140 * best-guess fuzzy result for broken mptables.
1142 if (best_guess < 0) {
1143 set_io_apic_irq_attr(irq_attr, apic,
1153 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
1155 void lock_vector_lock(void)
1157 /* Used to the online set of cpus does not change
1158 * during assign_irq_vector.
1160 spin_lock(&vector_lock);
1163 void unlock_vector_lock(void)
1165 spin_unlock(&vector_lock);
1169 __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
1172 * NOTE! The local APIC isn't very good at handling
1173 * multiple interrupts at the same interrupt level.
1174 * As the interrupt level is determined by taking the
1175 * vector number and shifting that right by 4, we
1176 * want to spread these out a bit so that they don't
1177 * all fall in the same interrupt level.
1179 * Also, we've got to be careful not to trash gate
1180 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1182 static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
1183 unsigned int old_vector;
1185 cpumask_var_t tmp_mask;
1187 if ((cfg->move_in_progress) || cfg->move_cleanup_count)
1190 if (!alloc_cpumask_var(&tmp_mask, GFP_ATOMIC))
1193 old_vector = cfg->vector;
1195 cpumask_and(tmp_mask, mask, cpu_online_mask);
1196 cpumask_and(tmp_mask, cfg->domain, tmp_mask);
1197 if (!cpumask_empty(tmp_mask)) {
1198 free_cpumask_var(tmp_mask);
1203 /* Only try and allocate irqs on cpus that are present */
1205 for_each_cpu_and(cpu, mask, cpu_online_mask) {
1209 apic->vector_allocation_domain(cpu, tmp_mask);
1211 vector = current_vector;
1212 offset = current_offset;
1215 if (vector >= first_system_vector) {
1216 /* If out of vectors on large boxen, must share them. */
1217 offset = (offset + 1) % 8;
1218 vector = FIRST_DEVICE_VECTOR + offset;
1220 if (unlikely(current_vector == vector))
1223 if (test_bit(vector, used_vectors))
1226 for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
1227 if (per_cpu(vector_irq, new_cpu)[vector] != -1)
1230 current_vector = vector;
1231 current_offset = offset;
1233 cfg->move_in_progress = 1;
1234 cpumask_copy(cfg->old_domain, cfg->domain);
1236 for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
1237 per_cpu(vector_irq, new_cpu)[vector] = irq;
1238 cfg->vector = vector;
1239 cpumask_copy(cfg->domain, tmp_mask);
1243 free_cpumask_var(tmp_mask);
1248 assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
1251 unsigned long flags;
1253 spin_lock_irqsave(&vector_lock, flags);
1254 err = __assign_irq_vector(irq, cfg, mask);
1255 spin_unlock_irqrestore(&vector_lock, flags);
1259 static void __clear_irq_vector(int irq, struct irq_cfg *cfg)
1263 BUG_ON(!cfg->vector);
1265 vector = cfg->vector;
1266 for_each_cpu_and(cpu, cfg->domain, cpu_online_mask)
1267 per_cpu(vector_irq, cpu)[vector] = -1;
1270 cpumask_clear(cfg->domain);
1272 if (likely(!cfg->move_in_progress))
1274 for_each_cpu_and(cpu, cfg->old_domain, cpu_online_mask) {
1275 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS;
1277 if (per_cpu(vector_irq, cpu)[vector] != irq)
1279 per_cpu(vector_irq, cpu)[vector] = -1;
1283 cfg->move_in_progress = 0;
1286 void __setup_vector_irq(int cpu)
1288 /* Initialize vector_irq on a new cpu */
1289 /* This function must be called with vector_lock held */
1291 struct irq_cfg *cfg;
1292 struct irq_desc *desc;
1294 /* Mark the inuse vectors */
1295 for_each_irq_desc(irq, desc) {
1296 cfg = desc->chip_data;
1297 if (!cpumask_test_cpu(cpu, cfg->domain))
1299 vector = cfg->vector;
1300 per_cpu(vector_irq, cpu)[vector] = irq;
1302 /* Mark the free vectors */
1303 for (vector = 0; vector < NR_VECTORS; ++vector) {
1304 irq = per_cpu(vector_irq, cpu)[vector];
1309 if (!cpumask_test_cpu(cpu, cfg->domain))
1310 per_cpu(vector_irq, cpu)[vector] = -1;
1314 static struct irq_chip ioapic_chip;
1315 static struct irq_chip ir_ioapic_chip;
1317 #define IOAPIC_AUTO -1
1318 #define IOAPIC_EDGE 0
1319 #define IOAPIC_LEVEL 1
1321 #ifdef CONFIG_X86_32
1322 static inline int IO_APIC_irq_trigger(int irq)
1326 for (apic = 0; apic < nr_ioapics; apic++) {
1327 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1328 idx = find_irq_entry(apic, pin, mp_INT);
1329 if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
1330 return irq_trigger(idx);
1334 * nonexistent IRQs are edge default
1339 static inline int IO_APIC_irq_trigger(int irq)
1345 static void ioapic_register_intr(int irq, struct irq_desc *desc, unsigned long trigger)
1348 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1349 trigger == IOAPIC_LEVEL)
1350 desc->status |= IRQ_LEVEL;
1352 desc->status &= ~IRQ_LEVEL;
1354 if (irq_remapped(irq)) {
1355 desc->status |= IRQ_MOVE_PCNTXT;
1357 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
1361 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
1362 handle_edge_irq, "edge");
1366 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1367 trigger == IOAPIC_LEVEL)
1368 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1372 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1373 handle_edge_irq, "edge");
1376 int setup_ioapic_entry(int apic_id, int irq,
1377 struct IO_APIC_route_entry *entry,
1378 unsigned int destination, int trigger,
1379 int polarity, int vector, int pin)
1382 * add it to the IO-APIC irq-routing table:
1384 memset(entry,0,sizeof(*entry));
1386 if (intr_remapping_enabled) {
1387 struct intel_iommu *iommu = map_ioapic_to_ir(apic_id);
1389 struct IR_IO_APIC_route_entry *ir_entry =
1390 (struct IR_IO_APIC_route_entry *) entry;
1394 panic("No mapping iommu for ioapic %d\n", apic_id);
1396 index = alloc_irte(iommu, irq, 1);
1398 panic("Failed to allocate IRTE for ioapic %d\n", apic_id);
1400 memset(&irte, 0, sizeof(irte));
1403 irte.dst_mode = apic->irq_dest_mode;
1405 * Trigger mode in the IRTE will always be edge, and the
1406 * actual level or edge trigger will be setup in the IO-APIC
1407 * RTE. This will help simplify level triggered irq migration.
1408 * For more details, see the comments above explainig IO-APIC
1409 * irq migration in the presence of interrupt-remapping.
1411 irte.trigger_mode = 0;
1412 irte.dlvry_mode = apic->irq_delivery_mode;
1413 irte.vector = vector;
1414 irte.dest_id = IRTE_DEST(destination);
1416 modify_irte(irq, &irte);
1418 ir_entry->index2 = (index >> 15) & 0x1;
1420 ir_entry->format = 1;
1421 ir_entry->index = (index & 0x7fff);
1423 * IO-APIC RTE will be configured with virtual vector.
1424 * irq handler will do the explicit EOI to the io-apic.
1426 ir_entry->vector = pin;
1428 entry->delivery_mode = apic->irq_delivery_mode;
1429 entry->dest_mode = apic->irq_dest_mode;
1430 entry->dest = destination;
1431 entry->vector = vector;
1434 entry->mask = 0; /* enable IRQ */
1435 entry->trigger = trigger;
1436 entry->polarity = polarity;
1438 /* Mask level triggered irqs.
1439 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
1446 static void setup_IO_APIC_irq(int apic_id, int pin, unsigned int irq, struct irq_desc *desc,
1447 int trigger, int polarity)
1449 struct irq_cfg *cfg;
1450 struct IO_APIC_route_entry entry;
1453 if (!IO_APIC_IRQ(irq))
1456 cfg = desc->chip_data;
1458 if (assign_irq_vector(irq, cfg, apic->target_cpus()))
1461 dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
1463 apic_printk(APIC_VERBOSE,KERN_DEBUG
1464 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
1465 "IRQ %d Mode:%i Active:%i)\n",
1466 apic_id, mp_ioapics[apic_id].apicid, pin, cfg->vector,
1467 irq, trigger, polarity);
1470 if (setup_ioapic_entry(mp_ioapics[apic_id].apicid, irq, &entry,
1471 dest, trigger, polarity, cfg->vector, pin)) {
1472 printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
1473 mp_ioapics[apic_id].apicid, pin);
1474 __clear_irq_vector(irq, cfg);
1478 ioapic_register_intr(irq, desc, trigger);
1479 if (irq < NR_IRQS_LEGACY)
1480 disable_8259A_irq(irq);
1482 ioapic_write_entry(apic_id, pin, entry);
1486 DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
1487 } mp_ioapic_routing[MAX_IO_APICS];
1489 static void __init setup_IO_APIC_irqs(void)
1491 int apic_id = 0, pin, idx, irq;
1493 struct irq_desc *desc;
1494 struct irq_cfg *cfg;
1495 int node = cpu_to_node(boot_cpu_id);
1497 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1500 if (!acpi_disabled && acpi_ioapic) {
1501 apic_id = mp_find_ioapic(0);
1507 for (pin = 0; pin < nr_ioapic_registers[apic_id]; pin++) {
1508 idx = find_irq_entry(apic_id, pin, mp_INT);
1512 apic_printk(APIC_VERBOSE,
1513 KERN_DEBUG " %d-%d",
1514 mp_ioapics[apic_id].apicid, pin);
1516 apic_printk(APIC_VERBOSE, " %d-%d",
1517 mp_ioapics[apic_id].apicid, pin);
1521 apic_printk(APIC_VERBOSE,
1522 " (apicid-pin) not connected\n");
1526 irq = pin_2_irq(idx, apic_id, pin);
1529 * Skip the timer IRQ if there's a quirk handler
1530 * installed and if it returns 1:
1532 if (apic->multi_timer_check &&
1533 apic->multi_timer_check(apic_id, irq))
1536 desc = irq_to_desc_alloc_node(irq, node);
1538 printk(KERN_INFO "can not get irq_desc for %d\n", irq);
1541 cfg = desc->chip_data;
1542 add_pin_to_irq_node(cfg, node, apic_id, pin);
1544 * don't mark it in pin_programmed, so later acpi could
1545 * set it correctly when irq < 16
1547 setup_IO_APIC_irq(apic_id, pin, irq, desc,
1548 irq_trigger(idx), irq_polarity(idx));
1552 apic_printk(APIC_VERBOSE,
1553 " (apicid-pin) not connected\n");
1557 * Set up the timer pin, possibly with the 8259A-master behind.
1559 static void __init setup_timer_IRQ0_pin(unsigned int apic_id, unsigned int pin,
1562 struct IO_APIC_route_entry entry;
1564 if (intr_remapping_enabled)
1567 memset(&entry, 0, sizeof(entry));
1570 * We use logical delivery to get the timer IRQ
1573 entry.dest_mode = apic->irq_dest_mode;
1574 entry.mask = 0; /* don't mask IRQ for edge */
1575 entry.dest = apic->cpu_mask_to_apicid(apic->target_cpus());
1576 entry.delivery_mode = apic->irq_delivery_mode;
1579 entry.vector = vector;
1582 * The timer IRQ doesn't have to know that behind the
1583 * scene we may have a 8259A-master in AEOI mode ...
1585 set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
1588 * Add it to the IO-APIC irq-routing table:
1590 ioapic_write_entry(apic_id, pin, entry);
1594 __apicdebuginit(void) print_IO_APIC(void)
1597 union IO_APIC_reg_00 reg_00;
1598 union IO_APIC_reg_01 reg_01;
1599 union IO_APIC_reg_02 reg_02;
1600 union IO_APIC_reg_03 reg_03;
1601 unsigned long flags;
1602 struct irq_cfg *cfg;
1603 struct irq_desc *desc;
1606 if (apic_verbosity == APIC_QUIET)
1609 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1610 for (i = 0; i < nr_ioapics; i++)
1611 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1612 mp_ioapics[i].apicid, nr_ioapic_registers[i]);
1615 * We are a bit conservative about what we expect. We have to
1616 * know about every hardware change ASAP.
1618 printk(KERN_INFO "testing the IO APIC.......................\n");
1620 for (apic = 0; apic < nr_ioapics; apic++) {
1622 spin_lock_irqsave(&ioapic_lock, flags);
1623 reg_00.raw = io_apic_read(apic, 0);
1624 reg_01.raw = io_apic_read(apic, 1);
1625 if (reg_01.bits.version >= 0x10)
1626 reg_02.raw = io_apic_read(apic, 2);
1627 if (reg_01.bits.version >= 0x20)
1628 reg_03.raw = io_apic_read(apic, 3);
1629 spin_unlock_irqrestore(&ioapic_lock, flags);
1632 printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].apicid);
1633 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1634 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1635 printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
1636 printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
1638 printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
1639 printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
1641 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1642 printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
1645 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1646 * but the value of reg_02 is read as the previous read register
1647 * value, so ignore it if reg_02 == reg_01.
1649 if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1650 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1651 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1655 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1656 * or reg_03, but the value of reg_0[23] is read as the previous read
1657 * register value, so ignore it if reg_03 == reg_0[12].
1659 if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1660 reg_03.raw != reg_01.raw) {
1661 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1662 printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
1665 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1667 printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
1668 " Stat Dmod Deli Vect: \n");
1670 for (i = 0; i <= reg_01.bits.entries; i++) {
1671 struct IO_APIC_route_entry entry;
1673 entry = ioapic_read_entry(apic, i);
1675 printk(KERN_DEBUG " %02x %03X ",
1680 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1685 entry.delivery_status,
1687 entry.delivery_mode,
1692 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1693 for_each_irq_desc(irq, desc) {
1694 struct irq_pin_list *entry;
1696 cfg = desc->chip_data;
1697 entry = cfg->irq_2_pin;
1700 printk(KERN_DEBUG "IRQ%d ", irq);
1702 printk("-> %d:%d", entry->apic, entry->pin);
1705 entry = entry->next;
1710 printk(KERN_INFO ".................................... done.\n");
1715 __apicdebuginit(void) print_APIC_bitfield(int base)
1720 if (apic_verbosity == APIC_QUIET)
1723 printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1724 for (i = 0; i < 8; i++) {
1725 v = apic_read(base + i*0x10);
1726 for (j = 0; j < 32; j++) {
1736 __apicdebuginit(void) print_local_APIC(void *dummy)
1738 unsigned int i, v, ver, maxlvt;
1741 if (apic_verbosity == APIC_QUIET)
1744 printk("\n" 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_bitfield(APIC_ISR);
1786 printk(KERN_DEBUG "... APIC TMR field:\n");
1787 print_APIC_bitfield(APIC_TMR);
1788 printk(KERN_DEBUG "... APIC IRR field:\n");
1789 print_APIC_bitfield(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_all_local_APICs(void)
1846 for_each_online_cpu(cpu)
1847 smp_call_function_single(cpu, print_local_APIC, NULL, 1);
1851 __apicdebuginit(void) print_PIC(void)
1854 unsigned long flags;
1856 if (apic_verbosity == APIC_QUIET)
1859 printk(KERN_DEBUG "\nprinting PIC contents\n");
1861 spin_lock_irqsave(&i8259A_lock, flags);
1863 v = inb(0xa1) << 8 | inb(0x21);
1864 printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
1866 v = inb(0xa0) << 8 | inb(0x20);
1867 printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
1871 v = inb(0xa0) << 8 | inb(0x20);
1875 spin_unlock_irqrestore(&i8259A_lock, flags);
1877 printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
1879 v = inb(0x4d1) << 8 | inb(0x4d0);
1880 printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1883 __apicdebuginit(int) print_all_ICs(void)
1887 /* don't print out if apic is not there */
1888 if (!cpu_has_apic || disable_apic)
1891 print_all_local_APICs();
1897 fs_initcall(print_all_ICs);
1900 /* Where if anywhere is the i8259 connect in external int mode */
1901 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
1903 void __init enable_IO_APIC(void)
1905 union IO_APIC_reg_01 reg_01;
1906 int i8259_apic, i8259_pin;
1908 unsigned long flags;
1911 * The number of IO-APIC IRQ registers (== #pins):
1913 for (apic = 0; apic < nr_ioapics; apic++) {
1914 spin_lock_irqsave(&ioapic_lock, flags);
1915 reg_01.raw = io_apic_read(apic, 1);
1916 spin_unlock_irqrestore(&ioapic_lock, flags);
1917 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1919 for(apic = 0; apic < nr_ioapics; apic++) {
1921 /* See if any of the pins is in ExtINT mode */
1922 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1923 struct IO_APIC_route_entry entry;
1924 entry = ioapic_read_entry(apic, pin);
1926 /* If the interrupt line is enabled and in ExtInt mode
1927 * I have found the pin where the i8259 is connected.
1929 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1930 ioapic_i8259.apic = apic;
1931 ioapic_i8259.pin = pin;
1937 /* Look to see what if the MP table has reported the ExtINT */
1938 /* If we could not find the appropriate pin by looking at the ioapic
1939 * the i8259 probably is not connected the ioapic but give the
1940 * mptable a chance anyway.
1942 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1943 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1944 /* Trust the MP table if nothing is setup in the hardware */
1945 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1946 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1947 ioapic_i8259.pin = i8259_pin;
1948 ioapic_i8259.apic = i8259_apic;
1950 /* Complain if the MP table and the hardware disagree */
1951 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1952 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1954 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1958 * Do not trust the IO-APIC being empty at bootup
1964 * Not an __init, needed by the reboot code
1966 void disable_IO_APIC(void)
1969 * Clear the IO-APIC before rebooting:
1974 * If the i8259 is routed through an IOAPIC
1975 * Put that IOAPIC in virtual wire mode
1976 * so legacy interrupts can be delivered.
1978 * With interrupt-remapping, for now we will use virtual wire A mode,
1979 * as virtual wire B is little complex (need to configure both
1980 * IOAPIC RTE aswell as interrupt-remapping table entry).
1981 * As this gets called during crash dump, keep this simple for now.
1983 if (ioapic_i8259.pin != -1 && !intr_remapping_enabled) {
1984 struct IO_APIC_route_entry entry;
1986 memset(&entry, 0, sizeof(entry));
1987 entry.mask = 0; /* Enabled */
1988 entry.trigger = 0; /* Edge */
1990 entry.polarity = 0; /* High */
1991 entry.delivery_status = 0;
1992 entry.dest_mode = 0; /* Physical */
1993 entry.delivery_mode = dest_ExtINT; /* ExtInt */
1995 entry.dest = read_apic_id();
1998 * Add it to the IO-APIC irq-routing table:
2000 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
2004 * Use virtual wire A mode when interrupt remapping is enabled.
2006 disconnect_bsp_APIC(!intr_remapping_enabled && ioapic_i8259.pin != -1);
2009 #ifdef CONFIG_X86_32
2011 * function to set the IO-APIC physical IDs based on the
2012 * values stored in the MPC table.
2014 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
2017 static void __init setup_ioapic_ids_from_mpc(void)
2019 union IO_APIC_reg_00 reg_00;
2020 physid_mask_t phys_id_present_map;
2023 unsigned char old_id;
2024 unsigned long flags;
2026 if (x86_quirks->setup_ioapic_ids && x86_quirks->setup_ioapic_ids())
2030 * Don't check I/O APIC IDs for xAPIC systems. They have
2031 * no meaning without the serial APIC bus.
2033 if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
2034 || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
2037 * This is broken; anything with a real cpu count has to
2038 * circumvent this idiocy regardless.
2040 phys_id_present_map = apic->ioapic_phys_id_map(phys_cpu_present_map);
2043 * Set the IOAPIC ID to the value stored in the MPC table.
2045 for (apic_id = 0; apic_id < nr_ioapics; apic_id++) {
2047 /* Read the register 0 value */
2048 spin_lock_irqsave(&ioapic_lock, flags);
2049 reg_00.raw = io_apic_read(apic_id, 0);
2050 spin_unlock_irqrestore(&ioapic_lock, flags);
2052 old_id = mp_ioapics[apic_id].apicid;
2054 if (mp_ioapics[apic_id].apicid >= get_physical_broadcast()) {
2055 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
2056 apic_id, mp_ioapics[apic_id].apicid);
2057 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
2059 mp_ioapics[apic_id].apicid = reg_00.bits.ID;
2063 * Sanity check, is the ID really free? Every APIC in a
2064 * system must have a unique ID or we get lots of nice
2065 * 'stuck on smp_invalidate_needed IPI wait' messages.
2067 if (apic->check_apicid_used(phys_id_present_map,
2068 mp_ioapics[apic_id].apicid)) {
2069 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
2070 apic_id, mp_ioapics[apic_id].apicid);
2071 for (i = 0; i < get_physical_broadcast(); i++)
2072 if (!physid_isset(i, phys_id_present_map))
2074 if (i >= get_physical_broadcast())
2075 panic("Max APIC ID exceeded!\n");
2076 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
2078 physid_set(i, phys_id_present_map);
2079 mp_ioapics[apic_id].apicid = i;
2082 tmp = apic->apicid_to_cpu_present(mp_ioapics[apic_id].apicid);
2083 apic_printk(APIC_VERBOSE, "Setting %d in the "
2084 "phys_id_present_map\n",
2085 mp_ioapics[apic_id].apicid);
2086 physids_or(phys_id_present_map, phys_id_present_map, tmp);
2091 * We need to adjust the IRQ routing table
2092 * if the ID changed.
2094 if (old_id != mp_ioapics[apic_id].apicid)
2095 for (i = 0; i < mp_irq_entries; i++)
2096 if (mp_irqs[i].dstapic == old_id)
2098 = mp_ioapics[apic_id].apicid;
2101 * Read the right value from the MPC table and
2102 * write it into the ID register.
2104 apic_printk(APIC_VERBOSE, KERN_INFO
2105 "...changing IO-APIC physical APIC ID to %d ...",
2106 mp_ioapics[apic_id].apicid);
2108 reg_00.bits.ID = mp_ioapics[apic_id].apicid;
2109 spin_lock_irqsave(&ioapic_lock, flags);
2110 io_apic_write(apic_id, 0, reg_00.raw);
2111 spin_unlock_irqrestore(&ioapic_lock, flags);
2116 spin_lock_irqsave(&ioapic_lock, flags);
2117 reg_00.raw = io_apic_read(apic_id, 0);
2118 spin_unlock_irqrestore(&ioapic_lock, flags);
2119 if (reg_00.bits.ID != mp_ioapics[apic_id].apicid)
2120 printk("could not set ID!\n");
2122 apic_printk(APIC_VERBOSE, " ok.\n");
2127 int no_timer_check __initdata;
2129 static int __init notimercheck(char *s)
2134 __setup("no_timer_check", notimercheck);
2137 * There is a nasty bug in some older SMP boards, their mptable lies
2138 * about the timer IRQ. We do the following to work around the situation:
2140 * - timer IRQ defaults to IO-APIC IRQ
2141 * - if this function detects that timer IRQs are defunct, then we fall
2142 * back to ISA timer IRQs
2144 static int __init timer_irq_works(void)
2146 unsigned long t1 = jiffies;
2147 unsigned long flags;
2152 local_save_flags(flags);
2154 /* Let ten ticks pass... */
2155 mdelay((10 * 1000) / HZ);
2156 local_irq_restore(flags);
2159 * Expect a few ticks at least, to be sure some possible
2160 * glue logic does not lock up after one or two first
2161 * ticks in a non-ExtINT mode. Also the local APIC
2162 * might have cached one ExtINT interrupt. Finally, at
2163 * least one tick may be lost due to delays.
2167 if (time_after(jiffies, t1 + 4))
2173 * In the SMP+IOAPIC case it might happen that there are an unspecified
2174 * number of pending IRQ events unhandled. These cases are very rare,
2175 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
2176 * better to do it this way as thus we do not have to be aware of
2177 * 'pending' interrupts in the IRQ path, except at this point.
2180 * Edge triggered needs to resend any interrupt
2181 * that was delayed but this is now handled in the device
2186 * Starting up a edge-triggered IO-APIC interrupt is
2187 * nasty - we need to make sure that we get the edge.
2188 * If it is already asserted for some reason, we need
2189 * return 1 to indicate that is was pending.
2191 * This is not complete - we should be able to fake
2192 * an edge even if it isn't on the 8259A...
2195 static unsigned int startup_ioapic_irq(unsigned int irq)
2197 int was_pending = 0;
2198 unsigned long flags;
2199 struct irq_cfg *cfg;
2201 spin_lock_irqsave(&ioapic_lock, flags);
2202 if (irq < NR_IRQS_LEGACY) {
2203 disable_8259A_irq(irq);
2204 if (i8259A_irq_pending(irq))
2208 __unmask_IO_APIC_irq(cfg);
2209 spin_unlock_irqrestore(&ioapic_lock, flags);
2214 #ifdef CONFIG_X86_64
2215 static int ioapic_retrigger_irq(unsigned int irq)
2218 struct irq_cfg *cfg = irq_cfg(irq);
2219 unsigned long flags;
2221 spin_lock_irqsave(&vector_lock, flags);
2222 apic->send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);
2223 spin_unlock_irqrestore(&vector_lock, flags);
2228 static int ioapic_retrigger_irq(unsigned int irq)
2230 apic->send_IPI_self(irq_cfg(irq)->vector);
2237 * Level and edge triggered IO-APIC interrupts need different handling,
2238 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
2239 * handled with the level-triggered descriptor, but that one has slightly
2240 * more overhead. Level-triggered interrupts cannot be handled with the
2241 * edge-triggered handler, without risking IRQ storms and other ugly
2246 static void send_cleanup_vector(struct irq_cfg *cfg)
2248 cpumask_var_t cleanup_mask;
2250 if (unlikely(!alloc_cpumask_var(&cleanup_mask, GFP_ATOMIC))) {
2252 cfg->move_cleanup_count = 0;
2253 for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
2254 cfg->move_cleanup_count++;
2255 for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
2256 apic->send_IPI_mask(cpumask_of(i), IRQ_MOVE_CLEANUP_VECTOR);
2258 cpumask_and(cleanup_mask, cfg->old_domain, cpu_online_mask);
2259 cfg->move_cleanup_count = cpumask_weight(cleanup_mask);
2260 apic->send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
2261 free_cpumask_var(cleanup_mask);
2263 cfg->move_in_progress = 0;
2266 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, struct irq_cfg *cfg)
2269 struct irq_pin_list *entry;
2270 u8 vector = cfg->vector;
2272 entry = cfg->irq_2_pin;
2282 * With interrupt-remapping, destination information comes
2283 * from interrupt-remapping table entry.
2285 if (!irq_remapped(irq))
2286 io_apic_write(apic, 0x11 + pin*2, dest);
2287 reg = io_apic_read(apic, 0x10 + pin*2);
2288 reg &= ~IO_APIC_REDIR_VECTOR_MASK;
2290 io_apic_modify(apic, 0x10 + pin*2, reg);
2293 entry = entry->next;
2298 assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask);
2301 * Either sets desc->affinity to a valid value, and returns
2302 * ->cpu_mask_to_apicid of that, or returns BAD_APICID and
2303 * leaves desc->affinity untouched.
2306 set_desc_affinity(struct irq_desc *desc, const struct cpumask *mask)
2308 struct irq_cfg *cfg;
2311 if (!cpumask_intersects(mask, cpu_online_mask))
2315 cfg = desc->chip_data;
2316 if (assign_irq_vector(irq, cfg, mask))
2319 cpumask_copy(desc->affinity, mask);
2321 return apic->cpu_mask_to_apicid_and(desc->affinity, cfg->domain);
2325 set_ioapic_affinity_irq_desc(struct irq_desc *desc, const struct cpumask *mask)
2327 struct irq_cfg *cfg;
2328 unsigned long flags;
2334 cfg = desc->chip_data;
2336 spin_lock_irqsave(&ioapic_lock, flags);
2337 dest = set_desc_affinity(desc, mask);
2338 if (dest != BAD_APICID) {
2339 /* Only the high 8 bits are valid. */
2340 dest = SET_APIC_LOGICAL_ID(dest);
2341 __target_IO_APIC_irq(irq, dest, cfg);
2344 spin_unlock_irqrestore(&ioapic_lock, flags);
2350 set_ioapic_affinity_irq(unsigned int irq, const struct cpumask *mask)
2352 struct irq_desc *desc;
2354 desc = irq_to_desc(irq);
2356 return set_ioapic_affinity_irq_desc(desc, mask);
2359 #ifdef CONFIG_INTR_REMAP
2362 * Migrate the IO-APIC irq in the presence of intr-remapping.
2364 * For both level and edge triggered, irq migration is a simple atomic
2365 * update(of vector and cpu destination) of IRTE and flush the hardware cache.
2367 * For level triggered, we eliminate the io-apic RTE modification (with the
2368 * updated vector information), by using a virtual vector (io-apic pin number).
2369 * Real vector that is used for interrupting cpu will be coming from
2370 * the interrupt-remapping table entry.
2373 migrate_ioapic_irq_desc(struct irq_desc *desc, const struct cpumask *mask)
2375 struct irq_cfg *cfg;
2381 if (!cpumask_intersects(mask, cpu_online_mask))
2385 if (get_irte(irq, &irte))
2388 cfg = desc->chip_data;
2389 if (assign_irq_vector(irq, cfg, mask))
2392 dest = apic->cpu_mask_to_apicid_and(cfg->domain, mask);
2394 irte.vector = cfg->vector;
2395 irte.dest_id = IRTE_DEST(dest);
2398 * Modified the IRTE and flushes the Interrupt entry cache.
2400 modify_irte(irq, &irte);
2402 if (cfg->move_in_progress)
2403 send_cleanup_vector(cfg);
2405 cpumask_copy(desc->affinity, mask);
2411 * Migrates the IRQ destination in the process context.
2413 static int set_ir_ioapic_affinity_irq_desc(struct irq_desc *desc,
2414 const struct cpumask *mask)
2416 return migrate_ioapic_irq_desc(desc, mask);
2418 static int set_ir_ioapic_affinity_irq(unsigned int irq,
2419 const struct cpumask *mask)
2421 struct irq_desc *desc = irq_to_desc(irq);
2423 return set_ir_ioapic_affinity_irq_desc(desc, mask);
2426 static inline int set_ir_ioapic_affinity_irq_desc(struct irq_desc *desc,
2427 const struct cpumask *mask)
2433 asmlinkage void smp_irq_move_cleanup_interrupt(void)
2435 unsigned vector, me;
2441 me = smp_processor_id();
2442 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
2445 struct irq_desc *desc;
2446 struct irq_cfg *cfg;
2447 irq = __get_cpu_var(vector_irq)[vector];
2452 desc = irq_to_desc(irq);
2457 spin_lock(&desc->lock);
2458 if (!cfg->move_cleanup_count)
2461 if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
2464 irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
2466 * Check if the vector that needs to be cleanedup is
2467 * registered at the cpu's IRR. If so, then this is not
2468 * the best time to clean it up. Lets clean it up in the
2469 * next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR
2472 if (irr & (1 << (vector % 32))) {
2473 apic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR);
2476 __get_cpu_var(vector_irq)[vector] = -1;
2477 cfg->move_cleanup_count--;
2479 spin_unlock(&desc->lock);
2485 static void irq_complete_move(struct irq_desc **descp)
2487 struct irq_desc *desc = *descp;
2488 struct irq_cfg *cfg = desc->chip_data;
2489 unsigned vector, me;
2491 if (likely(!cfg->move_in_progress))
2494 vector = ~get_irq_regs()->orig_ax;
2495 me = smp_processor_id();
2497 if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
2498 send_cleanup_vector(cfg);
2501 static inline void irq_complete_move(struct irq_desc **descp) {}
2504 static void ack_apic_edge(unsigned int irq)
2506 struct irq_desc *desc = irq_to_desc(irq);
2508 irq_complete_move(&desc);
2509 move_native_irq(irq);
2513 atomic_t irq_mis_count;
2515 static void ack_apic_level(unsigned int irq)
2517 struct irq_desc *desc = irq_to_desc(irq);
2519 #ifdef CONFIG_X86_32
2523 struct irq_cfg *cfg;
2524 int do_unmask_irq = 0;
2526 irq_complete_move(&desc);
2527 #ifdef CONFIG_GENERIC_PENDING_IRQ
2528 /* If we are moving the irq we need to mask it */
2529 if (unlikely(desc->status & IRQ_MOVE_PENDING)) {
2531 mask_IO_APIC_irq_desc(desc);
2535 #ifdef CONFIG_X86_32
2537 * It appears there is an erratum which affects at least version 0x11
2538 * of I/O APIC (that's the 82093AA and cores integrated into various
2539 * chipsets). Under certain conditions a level-triggered interrupt is
2540 * erroneously delivered as edge-triggered one but the respective IRR
2541 * bit gets set nevertheless. As a result the I/O unit expects an EOI
2542 * message but it will never arrive and further interrupts are blocked
2543 * from the source. The exact reason is so far unknown, but the
2544 * phenomenon was observed when two consecutive interrupt requests
2545 * from a given source get delivered to the same CPU and the source is
2546 * temporarily disabled in between.
2548 * A workaround is to simulate an EOI message manually. We achieve it
2549 * by setting the trigger mode to edge and then to level when the edge
2550 * trigger mode gets detected in the TMR of a local APIC for a
2551 * level-triggered interrupt. We mask the source for the time of the
2552 * operation to prevent an edge-triggered interrupt escaping meanwhile.
2553 * The idea is from Manfred Spraul. --macro
2555 cfg = desc->chip_data;
2558 v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
2562 * We must acknowledge the irq before we move it or the acknowledge will
2563 * not propagate properly.
2567 /* Now we can move and renable the irq */
2568 if (unlikely(do_unmask_irq)) {
2569 /* Only migrate the irq if the ack has been received.
2571 * On rare occasions the broadcast level triggered ack gets
2572 * delayed going to ioapics, and if we reprogram the
2573 * vector while Remote IRR is still set the irq will never
2576 * To prevent this scenario we read the Remote IRR bit
2577 * of the ioapic. This has two effects.
2578 * - On any sane system the read of the ioapic will
2579 * flush writes (and acks) going to the ioapic from
2581 * - We get to see if the ACK has actually been delivered.
2583 * Based on failed experiments of reprogramming the
2584 * ioapic entry from outside of irq context starting
2585 * with masking the ioapic entry and then polling until
2586 * Remote IRR was clear before reprogramming the
2587 * ioapic I don't trust the Remote IRR bit to be
2588 * completey accurate.
2590 * However there appears to be no other way to plug
2591 * this race, so if the Remote IRR bit is not
2592 * accurate and is causing problems then it is a hardware bug
2593 * and you can go talk to the chipset vendor about it.
2595 cfg = desc->chip_data;
2596 if (!io_apic_level_ack_pending(cfg))
2597 move_masked_irq(irq);
2598 unmask_IO_APIC_irq_desc(desc);
2601 #ifdef CONFIG_X86_32
2602 if (!(v & (1 << (i & 0x1f)))) {
2603 atomic_inc(&irq_mis_count);
2604 spin_lock(&ioapic_lock);
2605 __mask_and_edge_IO_APIC_irq(cfg);
2606 __unmask_and_level_IO_APIC_irq(cfg);
2607 spin_unlock(&ioapic_lock);
2612 #ifdef CONFIG_INTR_REMAP
2613 static void __eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
2616 struct irq_pin_list *entry;
2618 entry = cfg->irq_2_pin;
2626 io_apic_eoi(apic, pin);
2627 entry = entry->next;
2632 eoi_ioapic_irq(struct irq_desc *desc)
2634 struct irq_cfg *cfg;
2635 unsigned long flags;
2639 cfg = desc->chip_data;
2641 spin_lock_irqsave(&ioapic_lock, flags);
2642 __eoi_ioapic_irq(irq, cfg);
2643 spin_unlock_irqrestore(&ioapic_lock, flags);
2646 static void ir_ack_apic_edge(unsigned int irq)
2651 static void ir_ack_apic_level(unsigned int irq)
2653 struct irq_desc *desc = irq_to_desc(irq);
2656 eoi_ioapic_irq(desc);
2658 #endif /* CONFIG_INTR_REMAP */
2660 static struct irq_chip ioapic_chip __read_mostly = {
2662 .startup = startup_ioapic_irq,
2663 .mask = mask_IO_APIC_irq,
2664 .unmask = unmask_IO_APIC_irq,
2665 .ack = ack_apic_edge,
2666 .eoi = ack_apic_level,
2668 .set_affinity = set_ioapic_affinity_irq,
2670 .retrigger = ioapic_retrigger_irq,
2673 static struct irq_chip ir_ioapic_chip __read_mostly = {
2674 .name = "IR-IO-APIC",
2675 .startup = startup_ioapic_irq,
2676 .mask = mask_IO_APIC_irq,
2677 .unmask = unmask_IO_APIC_irq,
2678 #ifdef CONFIG_INTR_REMAP
2679 .ack = ir_ack_apic_edge,
2680 .eoi = ir_ack_apic_level,
2682 .set_affinity = set_ir_ioapic_affinity_irq,
2685 .retrigger = ioapic_retrigger_irq,
2688 static inline void init_IO_APIC_traps(void)
2691 struct irq_desc *desc;
2692 struct irq_cfg *cfg;
2695 * NOTE! The local APIC isn't very good at handling
2696 * multiple interrupts at the same interrupt level.
2697 * As the interrupt level is determined by taking the
2698 * vector number and shifting that right by 4, we
2699 * want to spread these out a bit so that they don't
2700 * all fall in the same interrupt level.
2702 * Also, we've got to be careful not to trash gate
2703 * 0x80, because int 0x80 is hm, kind of importantish. ;)
2705 for_each_irq_desc(irq, desc) {
2706 cfg = desc->chip_data;
2707 if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
2709 * Hmm.. We don't have an entry for this,
2710 * so default to an old-fashioned 8259
2711 * interrupt if we can..
2713 if (irq < NR_IRQS_LEGACY)
2714 make_8259A_irq(irq);
2716 /* Strange. Oh, well.. */
2717 desc->chip = &no_irq_chip;
2723 * The local APIC irq-chip implementation:
2726 static void mask_lapic_irq(unsigned int irq)
2730 v = apic_read(APIC_LVT0);
2731 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
2734 static void unmask_lapic_irq(unsigned int irq)
2738 v = apic_read(APIC_LVT0);
2739 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
2742 static void ack_lapic_irq(unsigned int irq)
2747 static struct irq_chip lapic_chip __read_mostly = {
2748 .name = "local-APIC",
2749 .mask = mask_lapic_irq,
2750 .unmask = unmask_lapic_irq,
2751 .ack = ack_lapic_irq,
2754 static void lapic_register_intr(int irq, struct irq_desc *desc)
2756 desc->status &= ~IRQ_LEVEL;
2757 set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
2761 static void __init setup_nmi(void)
2764 * Dirty trick to enable the NMI watchdog ...
2765 * We put the 8259A master into AEOI mode and
2766 * unmask on all local APICs LVT0 as NMI.
2768 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2769 * is from Maciej W. Rozycki - so we do not have to EOI from
2770 * the NMI handler or the timer interrupt.
2772 apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
2774 enable_NMI_through_LVT0();
2776 apic_printk(APIC_VERBOSE, " done.\n");
2780 * This looks a bit hackish but it's about the only one way of sending
2781 * a few INTA cycles to 8259As and any associated glue logic. ICR does
2782 * not support the ExtINT mode, unfortunately. We need to send these
2783 * cycles as some i82489DX-based boards have glue logic that keeps the
2784 * 8259A interrupt line asserted until INTA. --macro
2786 static inline void __init unlock_ExtINT_logic(void)
2789 struct IO_APIC_route_entry entry0, entry1;
2790 unsigned char save_control, save_freq_select;
2792 pin = find_isa_irq_pin(8, mp_INT);
2797 apic = find_isa_irq_apic(8, mp_INT);
2803 entry0 = ioapic_read_entry(apic, pin);
2804 clear_IO_APIC_pin(apic, pin);
2806 memset(&entry1, 0, sizeof(entry1));
2808 entry1.dest_mode = 0; /* physical delivery */
2809 entry1.mask = 0; /* unmask IRQ now */
2810 entry1.dest = hard_smp_processor_id();
2811 entry1.delivery_mode = dest_ExtINT;
2812 entry1.polarity = entry0.polarity;
2816 ioapic_write_entry(apic, pin, entry1);
2818 save_control = CMOS_READ(RTC_CONTROL);
2819 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2820 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2822 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2827 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2831 CMOS_WRITE(save_control, RTC_CONTROL);
2832 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2833 clear_IO_APIC_pin(apic, pin);
2835 ioapic_write_entry(apic, pin, entry0);
2838 static int disable_timer_pin_1 __initdata;
2839 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2840 static int __init disable_timer_pin_setup(char *arg)
2842 disable_timer_pin_1 = 1;
2845 early_param("disable_timer_pin_1", disable_timer_pin_setup);
2847 int timer_through_8259 __initdata;
2850 * This code may look a bit paranoid, but it's supposed to cooperate with
2851 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2852 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2853 * fanatically on his truly buggy board.
2855 * FIXME: really need to revamp this for all platforms.
2857 static inline void __init check_timer(void)
2859 struct irq_desc *desc = irq_to_desc(0);
2860 struct irq_cfg *cfg = desc->chip_data;
2861 int node = cpu_to_node(boot_cpu_id);
2862 int apic1, pin1, apic2, pin2;
2863 unsigned long flags;
2866 local_irq_save(flags);
2869 * get/set the timer IRQ vector:
2871 disable_8259A_irq(0);
2872 assign_irq_vector(0, cfg, apic->target_cpus());
2875 * As IRQ0 is to be enabled in the 8259A, the virtual
2876 * wire has to be disabled in the local APIC. Also
2877 * timer interrupts need to be acknowledged manually in
2878 * the 8259A for the i82489DX when using the NMI
2879 * watchdog as that APIC treats NMIs as level-triggered.
2880 * The AEOI mode will finish them in the 8259A
2883 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2885 #ifdef CONFIG_X86_32
2889 ver = apic_read(APIC_LVR);
2890 ver = GET_APIC_VERSION(ver);
2891 timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver));
2895 pin1 = find_isa_irq_pin(0, mp_INT);
2896 apic1 = find_isa_irq_apic(0, mp_INT);
2897 pin2 = ioapic_i8259.pin;
2898 apic2 = ioapic_i8259.apic;
2900 apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
2901 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2902 cfg->vector, apic1, pin1, apic2, pin2);
2905 * Some BIOS writers are clueless and report the ExtINTA
2906 * I/O APIC input from the cascaded 8259A as the timer
2907 * interrupt input. So just in case, if only one pin
2908 * was found above, try it both directly and through the
2912 if (intr_remapping_enabled)
2913 panic("BIOS bug: timer not connected to IO-APIC");
2917 } else if (pin2 == -1) {
2924 * Ok, does IRQ0 through the IOAPIC work?
2927 add_pin_to_irq_node(cfg, node, apic1, pin1);
2928 setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
2930 /* for edge trigger, setup_IO_APIC_irq already
2931 * leave it unmasked.
2932 * so only need to unmask if it is level-trigger
2933 * do we really have level trigger timer?
2936 idx = find_irq_entry(apic1, pin1, mp_INT);
2937 if (idx != -1 && irq_trigger(idx))
2938 unmask_IO_APIC_irq_desc(desc);
2940 if (timer_irq_works()) {
2941 if (nmi_watchdog == NMI_IO_APIC) {
2943 enable_8259A_irq(0);
2945 if (disable_timer_pin_1 > 0)
2946 clear_IO_APIC_pin(0, pin1);
2949 if (intr_remapping_enabled)
2950 panic("timer doesn't work through Interrupt-remapped IO-APIC");
2951 local_irq_disable();
2952 clear_IO_APIC_pin(apic1, pin1);
2954 apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
2955 "8254 timer not connected to IO-APIC\n");
2957 apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
2958 "(IRQ0) through the 8259A ...\n");
2959 apic_printk(APIC_QUIET, KERN_INFO
2960 "..... (found apic %d pin %d) ...\n", apic2, pin2);
2962 * legacy devices should be connected to IO APIC #0
2964 replace_pin_at_irq_node(cfg, node, apic1, pin1, apic2, pin2);
2965 setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
2966 enable_8259A_irq(0);
2967 if (timer_irq_works()) {
2968 apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
2969 timer_through_8259 = 1;
2970 if (nmi_watchdog == NMI_IO_APIC) {
2971 disable_8259A_irq(0);
2973 enable_8259A_irq(0);
2978 * Cleanup, just in case ...
2980 local_irq_disable();
2981 disable_8259A_irq(0);
2982 clear_IO_APIC_pin(apic2, pin2);
2983 apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
2986 if (nmi_watchdog == NMI_IO_APIC) {
2987 apic_printk(APIC_QUIET, KERN_WARNING "timer doesn't work "
2988 "through the IO-APIC - disabling NMI Watchdog!\n");
2989 nmi_watchdog = NMI_NONE;
2991 #ifdef CONFIG_X86_32
2995 apic_printk(APIC_QUIET, KERN_INFO
2996 "...trying to set up timer as Virtual Wire IRQ...\n");
2998 lapic_register_intr(0, desc);
2999 apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
3000 enable_8259A_irq(0);
3002 if (timer_irq_works()) {
3003 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
3006 local_irq_disable();
3007 disable_8259A_irq(0);
3008 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
3009 apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
3011 apic_printk(APIC_QUIET, KERN_INFO
3012 "...trying to set up timer as ExtINT IRQ...\n");
3016 apic_write(APIC_LVT0, APIC_DM_EXTINT);
3018 unlock_ExtINT_logic();
3020 if (timer_irq_works()) {
3021 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
3024 local_irq_disable();
3025 apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
3026 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
3027 "report. Then try booting with the 'noapic' option.\n");
3029 local_irq_restore(flags);
3033 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
3034 * to devices. However there may be an I/O APIC pin available for
3035 * this interrupt regardless. The pin may be left unconnected, but
3036 * typically it will be reused as an ExtINT cascade interrupt for
3037 * the master 8259A. In the MPS case such a pin will normally be
3038 * reported as an ExtINT interrupt in the MP table. With ACPI
3039 * there is no provision for ExtINT interrupts, and in the absence
3040 * of an override it would be treated as an ordinary ISA I/O APIC
3041 * interrupt, that is edge-triggered and unmasked by default. We
3042 * used to do this, but it caused problems on some systems because
3043 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
3044 * the same ExtINT cascade interrupt to drive the local APIC of the
3045 * bootstrap processor. Therefore we refrain from routing IRQ2 to
3046 * the I/O APIC in all cases now. No actual device should request
3047 * it anyway. --macro
3049 #define PIC_IRQS (1 << PIC_CASCADE_IR)
3051 void __init setup_IO_APIC(void)
3055 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
3058 io_apic_irqs = ~PIC_IRQS;
3060 apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
3062 * Set up IO-APIC IRQ routing.
3064 #ifdef CONFIG_X86_32
3066 setup_ioapic_ids_from_mpc();
3069 setup_IO_APIC_irqs();
3070 init_IO_APIC_traps();
3075 * Called after all the initialization is done. If we didnt find any
3076 * APIC bugs then we can allow the modify fast path
3079 static int __init io_apic_bug_finalize(void)
3081 if (sis_apic_bug == -1)
3086 late_initcall(io_apic_bug_finalize);
3088 struct sysfs_ioapic_data {
3089 struct sys_device dev;
3090 struct IO_APIC_route_entry entry[0];
3092 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
3094 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
3096 struct IO_APIC_route_entry *entry;
3097 struct sysfs_ioapic_data *data;
3100 data = container_of(dev, struct sysfs_ioapic_data, dev);
3101 entry = data->entry;
3102 for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
3103 *entry = ioapic_read_entry(dev->id, i);
3108 static int ioapic_resume(struct sys_device *dev)
3110 struct IO_APIC_route_entry *entry;
3111 struct sysfs_ioapic_data *data;
3112 unsigned long flags;
3113 union IO_APIC_reg_00 reg_00;
3116 data = container_of(dev, struct sysfs_ioapic_data, dev);
3117 entry = data->entry;
3119 spin_lock_irqsave(&ioapic_lock, flags);
3120 reg_00.raw = io_apic_read(dev->id, 0);
3121 if (reg_00.bits.ID != mp_ioapics[dev->id].apicid) {
3122 reg_00.bits.ID = mp_ioapics[dev->id].apicid;
3123 io_apic_write(dev->id, 0, reg_00.raw);
3125 spin_unlock_irqrestore(&ioapic_lock, flags);
3126 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
3127 ioapic_write_entry(dev->id, i, entry[i]);
3132 static struct sysdev_class ioapic_sysdev_class = {
3134 .suspend = ioapic_suspend,
3135 .resume = ioapic_resume,
3138 static int __init ioapic_init_sysfs(void)
3140 struct sys_device * dev;
3143 error = sysdev_class_register(&ioapic_sysdev_class);
3147 for (i = 0; i < nr_ioapics; i++ ) {
3148 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
3149 * sizeof(struct IO_APIC_route_entry);
3150 mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
3151 if (!mp_ioapic_data[i]) {
3152 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
3155 dev = &mp_ioapic_data[i]->dev;
3157 dev->cls = &ioapic_sysdev_class;
3158 error = sysdev_register(dev);
3160 kfree(mp_ioapic_data[i]);
3161 mp_ioapic_data[i] = NULL;
3162 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
3170 device_initcall(ioapic_init_sysfs);
3172 static int nr_irqs_gsi = NR_IRQS_LEGACY;
3174 * Dynamic irq allocate and deallocation
3176 unsigned int create_irq_nr(unsigned int irq_want, int node)
3178 /* Allocate an unused irq */
3181 unsigned long flags;
3182 struct irq_cfg *cfg_new = NULL;
3183 struct irq_desc *desc_new = NULL;
3186 if (irq_want < nr_irqs_gsi)
3187 irq_want = nr_irqs_gsi;
3189 spin_lock_irqsave(&vector_lock, flags);
3190 for (new = irq_want; new < nr_irqs; new++) {
3191 desc_new = irq_to_desc_alloc_node(new, node);
3193 printk(KERN_INFO "can not get irq_desc for %d\n", new);
3196 cfg_new = desc_new->chip_data;
3198 if (cfg_new->vector != 0)
3201 desc_new = move_irq_desc(desc_new, node);
3203 if (__assign_irq_vector(new, cfg_new, apic->target_cpus()) == 0)
3207 spin_unlock_irqrestore(&vector_lock, flags);
3210 dynamic_irq_init(irq);
3211 /* restore it, in case dynamic_irq_init clear it */
3213 desc_new->chip_data = cfg_new;
3218 int create_irq(void)
3220 int node = cpu_to_node(boot_cpu_id);
3221 unsigned int irq_want;
3224 irq_want = nr_irqs_gsi;
3225 irq = create_irq_nr(irq_want, node);
3233 void destroy_irq(unsigned int irq)
3235 unsigned long flags;
3236 struct irq_cfg *cfg;
3237 struct irq_desc *desc;
3239 /* store it, in case dynamic_irq_cleanup clear it */
3240 desc = irq_to_desc(irq);
3241 cfg = desc->chip_data;
3242 dynamic_irq_cleanup(irq);
3243 /* connect back irq_cfg */
3245 desc->chip_data = cfg;
3248 spin_lock_irqsave(&vector_lock, flags);
3249 __clear_irq_vector(irq, cfg);
3250 spin_unlock_irqrestore(&vector_lock, flags);
3254 * MSI message composition
3256 #ifdef CONFIG_PCI_MSI
3257 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
3259 struct irq_cfg *cfg;
3267 err = assign_irq_vector(irq, cfg, apic->target_cpus());
3271 dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
3273 if (irq_remapped(irq)) {
3278 ir_index = map_irq_to_irte_handle(irq, &sub_handle);
3279 BUG_ON(ir_index == -1);
3281 memset (&irte, 0, sizeof(irte));
3284 irte.dst_mode = apic->irq_dest_mode;
3285 irte.trigger_mode = 0; /* edge */
3286 irte.dlvry_mode = apic->irq_delivery_mode;
3287 irte.vector = cfg->vector;
3288 irte.dest_id = IRTE_DEST(dest);
3290 modify_irte(irq, &irte);
3292 msg->address_hi = MSI_ADDR_BASE_HI;
3293 msg->data = sub_handle;
3294 msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
3296 MSI_ADDR_IR_INDEX1(ir_index) |
3297 MSI_ADDR_IR_INDEX2(ir_index);
3299 if (x2apic_enabled())
3300 msg->address_hi = MSI_ADDR_BASE_HI |
3301 MSI_ADDR_EXT_DEST_ID(dest);
3303 msg->address_hi = MSI_ADDR_BASE_HI;
3307 ((apic->irq_dest_mode == 0) ?
3308 MSI_ADDR_DEST_MODE_PHYSICAL:
3309 MSI_ADDR_DEST_MODE_LOGICAL) |
3310 ((apic->irq_delivery_mode != dest_LowestPrio) ?
3311 MSI_ADDR_REDIRECTION_CPU:
3312 MSI_ADDR_REDIRECTION_LOWPRI) |
3313 MSI_ADDR_DEST_ID(dest);
3316 MSI_DATA_TRIGGER_EDGE |
3317 MSI_DATA_LEVEL_ASSERT |
3318 ((apic->irq_delivery_mode != dest_LowestPrio) ?
3319 MSI_DATA_DELIVERY_FIXED:
3320 MSI_DATA_DELIVERY_LOWPRI) |
3321 MSI_DATA_VECTOR(cfg->vector);
3327 static int set_msi_irq_affinity(unsigned int irq, const struct cpumask *mask)
3329 struct irq_desc *desc = irq_to_desc(irq);
3330 struct irq_cfg *cfg;
3334 dest = set_desc_affinity(desc, mask);
3335 if (dest == BAD_APICID)
3338 cfg = desc->chip_data;
3340 read_msi_msg_desc(desc, &msg);
3342 msg.data &= ~MSI_DATA_VECTOR_MASK;
3343 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3344 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3345 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3347 write_msi_msg_desc(desc, &msg);
3351 #ifdef CONFIG_INTR_REMAP
3353 * Migrate the MSI irq to another cpumask. This migration is
3354 * done in the process context using interrupt-remapping hardware.
3357 ir_set_msi_irq_affinity(unsigned int irq, const struct cpumask *mask)
3359 struct irq_desc *desc = irq_to_desc(irq);
3360 struct irq_cfg *cfg = desc->chip_data;
3364 if (get_irte(irq, &irte))
3367 dest = set_desc_affinity(desc, mask);
3368 if (dest == BAD_APICID)
3371 irte.vector = cfg->vector;
3372 irte.dest_id = IRTE_DEST(dest);
3375 * atomically update the IRTE with the new destination and vector.
3377 modify_irte(irq, &irte);
3380 * After this point, all the interrupts will start arriving
3381 * at the new destination. So, time to cleanup the previous
3382 * vector allocation.
3384 if (cfg->move_in_progress)
3385 send_cleanup_vector(cfg);
3391 #endif /* CONFIG_SMP */
3394 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
3395 * which implement the MSI or MSI-X Capability Structure.
3397 static struct irq_chip msi_chip = {
3399 .unmask = unmask_msi_irq,
3400 .mask = mask_msi_irq,
3401 .ack = ack_apic_edge,
3403 .set_affinity = set_msi_irq_affinity,
3405 .retrigger = ioapic_retrigger_irq,
3408 static struct irq_chip msi_ir_chip = {
3409 .name = "IR-PCI-MSI",
3410 .unmask = unmask_msi_irq,
3411 .mask = mask_msi_irq,
3412 #ifdef CONFIG_INTR_REMAP
3413 .ack = ir_ack_apic_edge,
3415 .set_affinity = ir_set_msi_irq_affinity,
3418 .retrigger = ioapic_retrigger_irq,
3422 * Map the PCI dev to the corresponding remapping hardware unit
3423 * and allocate 'nvec' consecutive interrupt-remapping table entries
3426 static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
3428 struct intel_iommu *iommu;
3431 iommu = map_dev_to_ir(dev);
3434 "Unable to map PCI %s to iommu\n", pci_name(dev));
3438 index = alloc_irte(iommu, irq, nvec);
3441 "Unable to allocate %d IRTE for PCI %s\n", nvec,
3448 static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
3453 ret = msi_compose_msg(dev, irq, &msg);
3457 set_irq_msi(irq, msidesc);
3458 write_msi_msg(irq, &msg);
3460 if (irq_remapped(irq)) {
3461 struct irq_desc *desc = irq_to_desc(irq);
3463 * irq migration in process context
3465 desc->status |= IRQ_MOVE_PCNTXT;
3466 set_irq_chip_and_handler_name(irq, &msi_ir_chip, handle_edge_irq, "edge");
3468 set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
3470 dev_printk(KERN_DEBUG, &dev->dev, "irq %d for MSI/MSI-X\n", irq);
3475 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
3478 int ret, sub_handle;
3479 struct msi_desc *msidesc;
3480 unsigned int irq_want;
3481 struct intel_iommu *iommu = NULL;
3485 /* x86 doesn't support multiple MSI yet */
3486 if (type == PCI_CAP_ID_MSI && nvec > 1)
3489 node = dev_to_node(&dev->dev);
3490 irq_want = nr_irqs_gsi;
3492 list_for_each_entry(msidesc, &dev->msi_list, list) {
3493 irq = create_irq_nr(irq_want, node);
3497 if (!intr_remapping_enabled)
3502 * allocate the consecutive block of IRTE's
3505 index = msi_alloc_irte(dev, irq, nvec);
3511 iommu = map_dev_to_ir(dev);
3517 * setup the mapping between the irq and the IRTE
3518 * base index, the sub_handle pointing to the
3519 * appropriate interrupt remap table entry.
3521 set_irte_irq(irq, iommu, index, sub_handle);
3524 ret = setup_msi_irq(dev, msidesc, irq);
3536 void arch_teardown_msi_irq(unsigned int irq)
3541 #if defined (CONFIG_DMAR) || defined (CONFIG_INTR_REMAP)
3543 static int dmar_msi_set_affinity(unsigned int irq, const struct cpumask *mask)
3545 struct irq_desc *desc = irq_to_desc(irq);
3546 struct irq_cfg *cfg;
3550 dest = set_desc_affinity(desc, mask);
3551 if (dest == BAD_APICID)
3554 cfg = desc->chip_data;
3556 dmar_msi_read(irq, &msg);
3558 msg.data &= ~MSI_DATA_VECTOR_MASK;
3559 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3560 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3561 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3563 dmar_msi_write(irq, &msg);
3568 #endif /* CONFIG_SMP */
3570 struct irq_chip dmar_msi_type = {
3572 .unmask = dmar_msi_unmask,
3573 .mask = dmar_msi_mask,
3574 .ack = ack_apic_edge,
3576 .set_affinity = dmar_msi_set_affinity,
3578 .retrigger = ioapic_retrigger_irq,
3581 int arch_setup_dmar_msi(unsigned int irq)
3586 ret = msi_compose_msg(NULL, irq, &msg);
3589 dmar_msi_write(irq, &msg);
3590 set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
3596 #ifdef CONFIG_HPET_TIMER
3599 static int hpet_msi_set_affinity(unsigned int irq, const struct cpumask *mask)
3601 struct irq_desc *desc = irq_to_desc(irq);
3602 struct irq_cfg *cfg;
3606 dest = set_desc_affinity(desc, mask);
3607 if (dest == BAD_APICID)
3610 cfg = desc->chip_data;
3612 hpet_msi_read(irq, &msg);
3614 msg.data &= ~MSI_DATA_VECTOR_MASK;
3615 msg.data |= MSI_DATA_VECTOR(cfg->vector);
3616 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
3617 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
3619 hpet_msi_write(irq, &msg);
3624 #endif /* CONFIG_SMP */
3626 static struct irq_chip hpet_msi_type = {
3628 .unmask = hpet_msi_unmask,
3629 .mask = hpet_msi_mask,
3630 .ack = ack_apic_edge,
3632 .set_affinity = hpet_msi_set_affinity,
3634 .retrigger = ioapic_retrigger_irq,
3637 int arch_setup_hpet_msi(unsigned int irq)
3641 struct irq_desc *desc = irq_to_desc(irq);
3643 ret = msi_compose_msg(NULL, irq, &msg);
3647 hpet_msi_write(irq, &msg);
3648 desc->status |= IRQ_MOVE_PCNTXT;
3649 set_irq_chip_and_handler_name(irq, &hpet_msi_type, handle_edge_irq,
3656 #endif /* CONFIG_PCI_MSI */
3658 * Hypertransport interrupt support
3660 #ifdef CONFIG_HT_IRQ
3664 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
3666 struct ht_irq_msg msg;
3667 fetch_ht_irq_msg(irq, &msg);
3669 msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
3670 msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
3672 msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
3673 msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
3675 write_ht_irq_msg(irq, &msg);
3678 static int set_ht_irq_affinity(unsigned int irq, const struct cpumask *mask)
3680 struct irq_desc *desc = irq_to_desc(irq);
3681 struct irq_cfg *cfg;
3684 dest = set_desc_affinity(desc, mask);
3685 if (dest == BAD_APICID)
3688 cfg = desc->chip_data;
3690 target_ht_irq(irq, dest, cfg->vector);
3697 static struct irq_chip ht_irq_chip = {
3699 .mask = mask_ht_irq,
3700 .unmask = unmask_ht_irq,
3701 .ack = ack_apic_edge,
3703 .set_affinity = set_ht_irq_affinity,
3705 .retrigger = ioapic_retrigger_irq,
3708 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
3710 struct irq_cfg *cfg;
3717 err = assign_irq_vector(irq, cfg, apic->target_cpus());
3719 struct ht_irq_msg msg;
3722 dest = apic->cpu_mask_to_apicid_and(cfg->domain,
3723 apic->target_cpus());
3725 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
3729 HT_IRQ_LOW_DEST_ID(dest) |
3730 HT_IRQ_LOW_VECTOR(cfg->vector) |
3731 ((apic->irq_dest_mode == 0) ?
3732 HT_IRQ_LOW_DM_PHYSICAL :
3733 HT_IRQ_LOW_DM_LOGICAL) |
3734 HT_IRQ_LOW_RQEOI_EDGE |
3735 ((apic->irq_delivery_mode != dest_LowestPrio) ?
3736 HT_IRQ_LOW_MT_FIXED :
3737 HT_IRQ_LOW_MT_ARBITRATED) |
3738 HT_IRQ_LOW_IRQ_MASKED;
3740 write_ht_irq_msg(irq, &msg);
3742 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
3743 handle_edge_irq, "edge");
3745 dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq);
3749 #endif /* CONFIG_HT_IRQ */
3751 #ifdef CONFIG_X86_UV
3753 * Re-target the irq to the specified CPU and enable the specified MMR located
3754 * on the specified blade to allow the sending of MSIs to the specified CPU.
3756 int arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
3757 unsigned long mmr_offset)
3759 const struct cpumask *eligible_cpu = cpumask_of(cpu);
3760 struct irq_cfg *cfg;
3762 unsigned long mmr_value;
3763 struct uv_IO_APIC_route_entry *entry;
3764 unsigned long flags;
3767 BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long));
3771 err = assign_irq_vector(irq, cfg, eligible_cpu);
3775 spin_lock_irqsave(&vector_lock, flags);
3776 set_irq_chip_and_handler_name(irq, &uv_irq_chip, handle_percpu_irq,
3778 spin_unlock_irqrestore(&vector_lock, flags);
3781 entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
3782 entry->vector = cfg->vector;
3783 entry->delivery_mode = apic->irq_delivery_mode;
3784 entry->dest_mode = apic->irq_dest_mode;
3785 entry->polarity = 0;
3788 entry->dest = apic->cpu_mask_to_apicid(eligible_cpu);
3790 mmr_pnode = uv_blade_to_pnode(mmr_blade);
3791 uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
3797 * Disable the specified MMR located on the specified blade so that MSIs are
3798 * longer allowed to be sent.
3800 void arch_disable_uv_irq(int mmr_blade, unsigned long mmr_offset)
3802 unsigned long mmr_value;
3803 struct uv_IO_APIC_route_entry *entry;
3806 BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long));
3809 entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
3812 mmr_pnode = uv_blade_to_pnode(mmr_blade);
3813 uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
3815 #endif /* CONFIG_X86_64 */
3817 int __init io_apic_get_redir_entries (int ioapic)
3819 union IO_APIC_reg_01 reg_01;
3820 unsigned long flags;
3822 spin_lock_irqsave(&ioapic_lock, flags);
3823 reg_01.raw = io_apic_read(ioapic, 1);
3824 spin_unlock_irqrestore(&ioapic_lock, flags);
3826 return reg_01.bits.entries;
3829 void __init probe_nr_irqs_gsi(void)
3833 nr = acpi_probe_gsi();
3834 if (nr > nr_irqs_gsi) {
3837 /* for acpi=off or acpi is not compiled in */
3841 for (idx = 0; idx < nr_ioapics; idx++)
3842 nr += io_apic_get_redir_entries(idx) + 1;
3844 if (nr > nr_irqs_gsi)
3848 printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
3851 #ifdef CONFIG_SPARSE_IRQ
3852 int __init arch_probe_nr_irqs(void)
3856 if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
3857 nr_irqs = NR_VECTORS * nr_cpu_ids;
3859 nr = nr_irqs_gsi + 8 * nr_cpu_ids;
3860 #if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
3862 * for MSI and HT dyn irq
3864 nr += nr_irqs_gsi * 16;
3873 static int __io_apic_set_pci_routing(struct device *dev, int irq,
3874 struct io_apic_irq_attr *irq_attr)
3876 struct irq_desc *desc;
3877 struct irq_cfg *cfg;
3880 int trigger, polarity;
3882 ioapic = irq_attr->ioapic;
3883 if (!IO_APIC_IRQ(irq)) {
3884 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
3890 node = dev_to_node(dev);
3892 node = cpu_to_node(boot_cpu_id);
3894 desc = irq_to_desc_alloc_node(irq, node);
3896 printk(KERN_INFO "can not get irq_desc %d\n", irq);
3900 pin = irq_attr->ioapic_pin;
3901 trigger = irq_attr->trigger;
3902 polarity = irq_attr->polarity;
3905 * IRQs < 16 are already in the irq_2_pin[] map
3907 if (irq >= NR_IRQS_LEGACY) {
3908 cfg = desc->chip_data;
3909 add_pin_to_irq_node(cfg, node, ioapic, pin);
3912 setup_IO_APIC_irq(ioapic, pin, irq, desc, trigger, polarity);
3917 int io_apic_set_pci_routing(struct device *dev, int irq,
3918 struct io_apic_irq_attr *irq_attr)
3922 * Avoid pin reprogramming. PRTs typically include entries
3923 * with redundant pin->gsi mappings (but unique PCI devices);
3924 * we only program the IOAPIC on the first.
3926 ioapic = irq_attr->ioapic;
3927 pin = irq_attr->ioapic_pin;
3928 if (test_bit(pin, mp_ioapic_routing[ioapic].pin_programmed)) {
3929 pr_debug("Pin %d-%d already programmed\n",
3930 mp_ioapics[ioapic].apicid, pin);
3933 set_bit(pin, mp_ioapic_routing[ioapic].pin_programmed);
3935 return __io_apic_set_pci_routing(dev, irq, irq_attr);
3938 /* --------------------------------------------------------------------------
3939 ACPI-based IOAPIC Configuration
3940 -------------------------------------------------------------------------- */
3944 #ifdef CONFIG_X86_32
3945 int __init io_apic_get_unique_id(int ioapic, int apic_id)
3947 union IO_APIC_reg_00 reg_00;
3948 static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
3950 unsigned long flags;
3954 * The P4 platform supports up to 256 APIC IDs on two separate APIC
3955 * buses (one for LAPICs, one for IOAPICs), where predecessors only
3956 * supports up to 16 on one shared APIC bus.
3958 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
3959 * advantage of new APIC bus architecture.
3962 if (physids_empty(apic_id_map))
3963 apic_id_map = apic->ioapic_phys_id_map(phys_cpu_present_map);
3965 spin_lock_irqsave(&ioapic_lock, flags);
3966 reg_00.raw = io_apic_read(ioapic, 0);
3967 spin_unlock_irqrestore(&ioapic_lock, flags);
3969 if (apic_id >= get_physical_broadcast()) {
3970 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
3971 "%d\n", ioapic, apic_id, reg_00.bits.ID);
3972 apic_id = reg_00.bits.ID;
3976 * Every APIC in a system must have a unique ID or we get lots of nice
3977 * 'stuck on smp_invalidate_needed IPI wait' messages.
3979 if (apic->check_apicid_used(apic_id_map, apic_id)) {
3981 for (i = 0; i < get_physical_broadcast(); i++) {
3982 if (!apic->check_apicid_used(apic_id_map, i))
3986 if (i == get_physical_broadcast())
3987 panic("Max apic_id exceeded!\n");
3989 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
3990 "trying %d\n", ioapic, apic_id, i);
3995 tmp = apic->apicid_to_cpu_present(apic_id);
3996 physids_or(apic_id_map, apic_id_map, tmp);
3998 if (reg_00.bits.ID != apic_id) {
3999 reg_00.bits.ID = apic_id;
4001 spin_lock_irqsave(&ioapic_lock, flags);
4002 io_apic_write(ioapic, 0, reg_00.raw);
4003 reg_00.raw = io_apic_read(ioapic, 0);
4004 spin_unlock_irqrestore(&ioapic_lock, flags);
4007 if (reg_00.bits.ID != apic_id) {
4008 printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
4013 apic_printk(APIC_VERBOSE, KERN_INFO
4014 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
4020 int __init io_apic_get_version(int ioapic)
4022 union IO_APIC_reg_01 reg_01;
4023 unsigned long flags;
4025 spin_lock_irqsave(&ioapic_lock, flags);
4026 reg_01.raw = io_apic_read(ioapic, 1);
4027 spin_unlock_irqrestore(&ioapic_lock, flags);
4029 return reg_01.bits.version;
4032 int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
4036 if (skip_ioapic_setup)
4039 for (i = 0; i < mp_irq_entries; i++)
4040 if (mp_irqs[i].irqtype == mp_INT &&
4041 mp_irqs[i].srcbusirq == bus_irq)
4043 if (i >= mp_irq_entries)
4046 *trigger = irq_trigger(i);
4047 *polarity = irq_polarity(i);
4051 #endif /* CONFIG_ACPI */
4054 * This function currently is only a helper for the i386 smp boot process where
4055 * we need to reprogram the ioredtbls to cater for the cpus which have come online
4056 * so mask in all cases should simply be apic->target_cpus()
4059 void __init setup_ioapic_dest(void)
4061 int pin, ioapic = 0, irq, irq_entry;
4062 struct irq_desc *desc;
4063 const struct cpumask *mask;
4065 if (skip_ioapic_setup == 1)
4069 if (!acpi_disabled && acpi_ioapic) {
4070 ioapic = mp_find_ioapic(0);
4076 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
4077 irq_entry = find_irq_entry(ioapic, pin, mp_INT);
4078 if (irq_entry == -1)
4080 irq = pin_2_irq(irq_entry, ioapic, pin);
4082 desc = irq_to_desc(irq);
4085 * Honour affinities which have been set in early boot
4088 (IRQ_NO_BALANCING | IRQ_AFFINITY_SET))
4089 mask = desc->affinity;
4091 mask = apic->target_cpus();
4093 if (intr_remapping_enabled)
4094 set_ir_ioapic_affinity_irq_desc(desc, mask);
4096 set_ioapic_affinity_irq_desc(desc, mask);
4102 #define IOAPIC_RESOURCE_NAME_SIZE 11
4104 static struct resource *ioapic_resources;
4106 static struct resource * __init ioapic_setup_resources(void)
4109 struct resource *res;
4113 if (nr_ioapics <= 0)
4116 n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
4119 mem = alloc_bootmem(n);
4123 mem += sizeof(struct resource) * nr_ioapics;
4125 for (i = 0; i < nr_ioapics; i++) {
4127 res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
4128 sprintf(mem, "IOAPIC %u", i);
4129 mem += IOAPIC_RESOURCE_NAME_SIZE;
4133 ioapic_resources = res;
4138 void __init ioapic_init_mappings(void)
4140 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
4141 struct resource *ioapic_res;
4144 ioapic_res = ioapic_setup_resources();
4145 for (i = 0; i < nr_ioapics; i++) {
4146 if (smp_found_config) {
4147 ioapic_phys = mp_ioapics[i].apicaddr;
4148 #ifdef CONFIG_X86_32
4151 "WARNING: bogus zero IO-APIC "
4152 "address found in MPTABLE, "
4153 "disabling IO/APIC support!\n");
4154 smp_found_config = 0;
4155 skip_ioapic_setup = 1;
4156 goto fake_ioapic_page;
4160 #ifdef CONFIG_X86_32
4163 ioapic_phys = (unsigned long)
4164 alloc_bootmem_pages(PAGE_SIZE);
4165 ioapic_phys = __pa(ioapic_phys);
4167 set_fixmap_nocache(idx, ioapic_phys);
4168 apic_printk(APIC_VERBOSE,
4169 "mapped IOAPIC to %08lx (%08lx)\n",
4170 __fix_to_virt(idx), ioapic_phys);
4173 if (ioapic_res != NULL) {
4174 ioapic_res->start = ioapic_phys;
4175 ioapic_res->end = ioapic_phys + (4 * 1024) - 1;
4181 static int __init ioapic_insert_resources(void)
4184 struct resource *r = ioapic_resources;
4187 if (nr_ioapics > 0) {
4189 "IO APIC resources couldn't be allocated.\n");
4195 for (i = 0; i < nr_ioapics; i++) {
4196 insert_resource(&iomem_resource, r);
4203 /* Insert the IO APIC resources after PCI initialization has occured to handle
4204 * IO APICS that are mapped in on a BAR in PCI space. */
4205 late_initcall(ioapic_insert_resources);