2 * Intel IO-APIC support for multi-Pentium hosts.
4 * Copyright (C) 1997, 1998, 1999, 2000 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/bootmem.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/pci.h>
35 #include <linux/msi.h>
36 #include <linux/htirq.h>
37 #include <linux/freezer.h>
38 #include <linux/kthread.h>
39 #include <linux/jiffies.h> /* time_after() */
44 #include <asm/timer.h>
45 #include <asm/i8259.h>
47 #include <asm/msidef.h>
48 #include <asm/hypertransport.h>
49 #include <asm/setup.h>
51 #include <mach_apic.h>
52 #include <mach_apicdef.h>
54 #define __apicdebuginit(type) static type __init
56 int (*ioapic_renumber_irq)(int ioapic, int irq);
57 atomic_t irq_mis_count;
59 /* Where if anywhere is the i8259 connect in external int mode */
60 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
62 static DEFINE_SPINLOCK(ioapic_lock);
63 DEFINE_SPINLOCK(vector_lock);
65 int timer_through_8259 __initdata;
68 * Is the SiS APIC rmw bug present ?
69 * -1 = don't know, 0 = no, 1 = yes
71 int sis_apic_bug = -1;
75 * # of IRQ routing registers
77 int nr_ioapic_registers[MAX_IO_APICS];
79 /* I/O APIC entries */
80 struct mp_config_ioapic mp_ioapics[MAX_IO_APICS];
83 /* MP IRQ source entries */
84 struct mp_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
86 /* # of MP IRQ source entries */
89 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
90 int mp_bus_id_to_type[MAX_MP_BUSSES];
93 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
95 static int disable_timer_pin_1 __initdata;
101 struct irq_cfg *next;
102 struct irq_pin_list *irq_2_pin;
107 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
108 static struct irq_cfg irq_cfg_legacy[] __initdata = {
109 [0] = { .irq = 0, .vector = IRQ0_VECTOR, },
110 [1] = { .irq = 1, .vector = IRQ1_VECTOR, },
111 [2] = { .irq = 2, .vector = IRQ2_VECTOR, },
112 [3] = { .irq = 3, .vector = IRQ3_VECTOR, },
113 [4] = { .irq = 4, .vector = IRQ4_VECTOR, },
114 [5] = { .irq = 5, .vector = IRQ5_VECTOR, },
115 [6] = { .irq = 6, .vector = IRQ6_VECTOR, },
116 [7] = { .irq = 7, .vector = IRQ7_VECTOR, },
117 [8] = { .irq = 8, .vector = IRQ8_VECTOR, },
118 [9] = { .irq = 9, .vector = IRQ9_VECTOR, },
119 [10] = { .irq = 10, .vector = IRQ10_VECTOR, },
120 [11] = { .irq = 11, .vector = IRQ11_VECTOR, },
121 [12] = { .irq = 12, .vector = IRQ12_VECTOR, },
122 [13] = { .irq = 13, .vector = IRQ13_VECTOR, },
123 [14] = { .irq = 14, .vector = IRQ14_VECTOR, },
124 [15] = { .irq = 15, .vector = IRQ15_VECTOR, },
127 static struct irq_cfg irq_cfg_init = { .irq = -1U, };
128 /* need to be biger than size of irq_cfg_legacy */
129 static int nr_irq_cfg = 32;
131 static int __init parse_nr_irq_cfg(char *arg)
134 nr_irq_cfg = simple_strtoul(arg, NULL, 0);
141 early_param("nr_irq_cfg", parse_nr_irq_cfg);
143 static void init_one_irq_cfg(struct irq_cfg *cfg)
145 memcpy(cfg, &irq_cfg_init, sizeof(struct irq_cfg));
148 static struct irq_cfg *irq_cfgx;
149 static struct irq_cfg *irq_cfgx_free;
150 static void __init init_work(void *data)
152 struct dyn_array *da = data;
159 memcpy(cfg, irq_cfg_legacy, sizeof(irq_cfg_legacy));
161 legacy_count = sizeof(irq_cfg_legacy)/sizeof(irq_cfg_legacy[0]);
162 for (i = legacy_count; i < *da->nr; i++)
163 init_one_irq_cfg(&cfg[i]);
165 for (i = 1; i < *da->nr; i++)
166 cfg[i-1].next = &cfg[i];
168 irq_cfgx_free = &irq_cfgx[legacy_count];
169 irq_cfgx[legacy_count - 1].next = NULL;
172 #define for_each_irq_cfg(cfg) \
173 for (cfg = irq_cfgx; cfg; cfg = cfg->next)
175 DEFINE_DYN_ARRAY(irq_cfgx, sizeof(struct irq_cfg), nr_irq_cfg, PAGE_SIZE, init_work);
177 static struct irq_cfg *irq_cfg(unsigned int irq)
192 static struct irq_cfg *irq_cfg_alloc(unsigned int irq)
194 struct irq_cfg *cfg, *cfg_pri;
198 cfg_pri = cfg = irq_cfgx;
208 if (!irq_cfgx_free) {
210 unsigned long total_bytes;
212 * we run out of pre-allocate ones, allocate more
214 printk(KERN_DEBUG "try to get more irq_cfg %d\n", nr_irq_cfg);
216 total_bytes = sizeof(struct irq_cfg) * nr_irq_cfg;
218 cfg = kzalloc(total_bytes, GFP_ATOMIC);
220 cfg = __alloc_bootmem_nopanic(total_bytes, PAGE_SIZE, 0);
223 panic("please boot with nr_irq_cfg= %d\n", count * 2);
226 printk(KERN_DEBUG "irq_irq ==> [%#lx - %#lx]\n", phys, phys + total_bytes);
228 for (i = 0; i < nr_irq_cfg; i++)
229 init_one_irq_cfg(&cfg[i]);
231 for (i = 1; i < nr_irq_cfg; i++)
232 cfg[i-1].next = &cfg[i];
238 irq_cfgx_free = irq_cfgx_free->next;
245 printk(KERN_DEBUG "found new irq_cfg for irq %d\n", cfg->irq);
247 #ifdef CONFIG_HAVE_SPARSE_IRQ_DEBUG
249 /* dump the results */
252 unsigned long bytes = sizeof(struct irq_cfg);
254 printk(KERN_DEBUG "=========================== %d\n", irq);
255 printk(KERN_DEBUG "irq_cfg dump after get that for %d\n", irq);
256 for_each_irq_cfg(cfg) {
258 printk(KERN_DEBUG "irq_cfg %d ==> [%#lx - %#lx]\n", cfg->irq, phys, phys + bytes);
260 printk(KERN_DEBUG "===========================\n");
267 * Rough estimation of how many shared IRQs there are, can
268 * be changed anytime.
273 * This is performance-critical, we want to do it O(1)
275 * the indexing order of this array favors 1:1 mappings
276 * between pins and IRQs.
279 struct irq_pin_list {
281 struct irq_pin_list *next;
284 static struct irq_pin_list *irq_2_pin_head;
285 /* fill one page ? */
286 static int nr_irq_2_pin = 0x100;
287 static struct irq_pin_list *irq_2_pin_ptr;
288 static void __init irq_2_pin_init_work(void *data)
290 struct dyn_array *da = data;
291 struct irq_pin_list *pin;
296 for (i = 1; i < *da->nr; i++)
297 pin[i-1].next = &pin[i];
299 irq_2_pin_ptr = &pin[0];
301 DEFINE_DYN_ARRAY(irq_2_pin_head, sizeof(struct irq_pin_list), nr_irq_2_pin, PAGE_SIZE, irq_2_pin_init_work);
303 static struct irq_pin_list *get_one_free_irq_2_pin(void)
305 struct irq_pin_list *pin;
311 irq_2_pin_ptr = pin->next;
317 * we run out of pre-allocate ones, allocate more
319 printk(KERN_DEBUG "try to get more irq_2_pin %d\n", nr_irq_2_pin);
322 pin = kzalloc(sizeof(struct irq_pin_list)*nr_irq_2_pin,
325 pin = __alloc_bootmem_nopanic(sizeof(struct irq_pin_list) *
326 nr_irq_2_pin, PAGE_SIZE, 0);
329 panic("can not get more irq_2_pin\n");
331 for (i = 1; i < nr_irq_2_pin; i++)
332 pin[i-1].next = &pin[i];
334 irq_2_pin_ptr = pin->next;
342 unsigned int unused[3];
346 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
348 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
349 + (mp_ioapics[idx].mp_apicaddr & ~PAGE_MASK);
352 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
354 struct io_apic __iomem *io_apic = io_apic_base(apic);
355 writel(reg, &io_apic->index);
356 return readl(&io_apic->data);
359 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
361 struct io_apic __iomem *io_apic = io_apic_base(apic);
362 writel(reg, &io_apic->index);
363 writel(value, &io_apic->data);
367 * Re-write a value: to be used for read-modify-write
368 * cycles where the read already set up the index register.
370 * Older SiS APIC requires we rewrite the index register
372 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
374 volatile struct io_apic __iomem *io_apic = io_apic_base(apic);
376 writel(reg, &io_apic->index);
377 writel(value, &io_apic->data);
381 struct { u32 w1, w2; };
382 struct IO_APIC_route_entry entry;
385 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
387 union entry_union eu;
389 spin_lock_irqsave(&ioapic_lock, flags);
390 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
391 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
392 spin_unlock_irqrestore(&ioapic_lock, flags);
397 * When we write a new IO APIC routing entry, we need to write the high
398 * word first! If the mask bit in the low word is clear, we will enable
399 * the interrupt, and we need to make sure the entry is fully populated
400 * before that happens.
403 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
405 union entry_union eu;
407 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
408 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
411 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
414 spin_lock_irqsave(&ioapic_lock, flags);
415 __ioapic_write_entry(apic, pin, e);
416 spin_unlock_irqrestore(&ioapic_lock, flags);
420 * When we mask an IO APIC routing entry, we need to write the low
421 * word first, in order to set the mask bit before we change the
424 static void ioapic_mask_entry(int apic, int pin)
427 union entry_union eu = { .entry.mask = 1 };
429 spin_lock_irqsave(&ioapic_lock, flags);
430 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
431 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
432 spin_unlock_irqrestore(&ioapic_lock, flags);
436 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
437 * shared ISA-space IRQs, so we have to support them. We are super
438 * fast in the common case, and fast for shared ISA-space IRQs.
440 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
443 struct irq_pin_list *entry;
445 /* first time to refer irq_cfg, so with new */
446 cfg = irq_cfg_alloc(irq);
447 entry = cfg->irq_2_pin;
449 entry = get_one_free_irq_2_pin();
450 cfg->irq_2_pin = entry;
453 printk(KERN_DEBUG " 0 add_pin_to_irq: irq %d --> apic %d pin %d\n", irq, apic, pin);
457 while (entry->next) {
458 /* not again, please */
459 if (entry->apic == apic && entry->pin == pin)
465 entry->next = get_one_free_irq_2_pin();
469 printk(KERN_DEBUG " x add_pin_to_irq: irq %d --> apic %d pin %d\n", irq, apic, pin);
473 * Reroute an IRQ to a different pin.
475 static void __init replace_pin_at_irq(unsigned int irq,
476 int oldapic, int oldpin,
477 int newapic, int newpin)
479 struct irq_cfg *cfg = irq_cfg(irq);
480 struct irq_pin_list *entry = cfg->irq_2_pin;
484 if (entry->apic == oldapic && entry->pin == oldpin) {
485 entry->apic = newapic;
488 /* every one is different, right? */
494 /* why? call replace before add? */
496 add_pin_to_irq(irq, newapic, newpin);
499 static void __modify_IO_APIC_irq(unsigned int irq, unsigned long enable, unsigned long disable)
502 struct irq_pin_list *entry;
503 unsigned int pin, reg;
506 entry = cfg->irq_2_pin;
511 reg = io_apic_read(entry->apic, 0x10 + pin*2);
514 io_apic_modify(entry->apic, 0x10 + pin*2, reg);
522 static void __mask_IO_APIC_irq(unsigned int irq)
524 __modify_IO_APIC_irq(irq, IO_APIC_REDIR_MASKED, 0);
528 static void __unmask_IO_APIC_irq(unsigned int irq)
530 __modify_IO_APIC_irq(irq, 0, IO_APIC_REDIR_MASKED);
533 /* mask = 1, trigger = 0 */
534 static void __mask_and_edge_IO_APIC_irq(unsigned int irq)
536 __modify_IO_APIC_irq(irq, IO_APIC_REDIR_MASKED,
537 IO_APIC_REDIR_LEVEL_TRIGGER);
540 /* mask = 0, trigger = 1 */
541 static void __unmask_and_level_IO_APIC_irq(unsigned int irq)
543 __modify_IO_APIC_irq(irq, IO_APIC_REDIR_LEVEL_TRIGGER,
544 IO_APIC_REDIR_MASKED);
547 static void mask_IO_APIC_irq(unsigned int irq)
551 spin_lock_irqsave(&ioapic_lock, flags);
552 __mask_IO_APIC_irq(irq);
553 spin_unlock_irqrestore(&ioapic_lock, flags);
556 static void unmask_IO_APIC_irq(unsigned int irq)
560 spin_lock_irqsave(&ioapic_lock, flags);
561 __unmask_IO_APIC_irq(irq);
562 spin_unlock_irqrestore(&ioapic_lock, flags);
565 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
567 struct IO_APIC_route_entry entry;
569 /* Check delivery_mode to be sure we're not clearing an SMI pin */
570 entry = ioapic_read_entry(apic, pin);
571 if (entry.delivery_mode == dest_SMI)
575 * Disable it in the IO-APIC irq-routing table:
577 ioapic_mask_entry(apic, pin);
580 static void clear_IO_APIC(void)
584 for (apic = 0; apic < nr_ioapics; apic++)
585 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
586 clear_IO_APIC_pin(apic, pin);
590 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
595 struct irq_pin_list *entry;
596 unsigned int apicid_value;
601 entry = cfg->irq_2_pin;
603 cpus_and(tmp, cpumask, cpu_online_map);
607 cpus_and(cpumask, tmp, CPU_MASK_ALL);
609 apicid_value = cpu_mask_to_apicid(cpumask);
610 /* Prepare to do the io_apic_write */
611 apicid_value = apicid_value << 24;
612 spin_lock_irqsave(&ioapic_lock, flags);
617 io_apic_write(entry->apic, 0x10 + 1 + pin*2, apicid_value);
622 irq_to_desc(irq)->affinity = cpumask;
623 spin_unlock_irqrestore(&ioapic_lock, flags);
626 #endif /* CONFIG_SMP */
629 void send_IPI_self(int vector)
636 apic_wait_icr_idle();
637 cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL;
639 * Send the IPI. The write to APIC_ICR fires this off.
641 apic_write(APIC_ICR, cfg);
643 #endif /* !CONFIG_SMP */
647 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
648 * specific CPU-side IRQs.
652 static int pirq_entries [MAX_PIRQS];
653 static int pirqs_enabled;
654 int skip_ioapic_setup;
656 static int __init ioapic_pirq_setup(char *str)
659 int ints[MAX_PIRQS+1];
661 get_options(str, ARRAY_SIZE(ints), ints);
663 for (i = 0; i < MAX_PIRQS; i++)
664 pirq_entries[i] = -1;
667 apic_printk(APIC_VERBOSE, KERN_INFO
668 "PIRQ redirection, working around broken MP-BIOS.\n");
670 if (ints[0] < MAX_PIRQS)
673 for (i = 0; i < max; i++) {
674 apic_printk(APIC_VERBOSE, KERN_DEBUG
675 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
677 * PIRQs are mapped upside down, usually.
679 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
684 __setup("pirq=", ioapic_pirq_setup);
687 * Find the IRQ entry number of a certain pin.
689 static int find_irq_entry(int apic, int pin, int type)
693 for (i = 0; i < mp_irq_entries; i++)
694 if (mp_irqs[i].mp_irqtype == type &&
695 (mp_irqs[i].mp_dstapic == mp_ioapics[apic].mp_apicid ||
696 mp_irqs[i].mp_dstapic == MP_APIC_ALL) &&
697 mp_irqs[i].mp_dstirq == pin)
704 * Find the pin to which IRQ[irq] (ISA) is connected
706 static int __init find_isa_irq_pin(int irq, int type)
710 for (i = 0; i < mp_irq_entries; i++) {
711 int lbus = mp_irqs[i].mp_srcbus;
713 if (test_bit(lbus, mp_bus_not_pci) &&
714 (mp_irqs[i].mp_irqtype == type) &&
715 (mp_irqs[i].mp_srcbusirq == irq))
717 return mp_irqs[i].mp_dstirq;
722 static int __init find_isa_irq_apic(int irq, int type)
726 for (i = 0; i < mp_irq_entries; i++) {
727 int lbus = mp_irqs[i].mp_srcbus;
729 if (test_bit(lbus, mp_bus_not_pci) &&
730 (mp_irqs[i].mp_irqtype == type) &&
731 (mp_irqs[i].mp_srcbusirq == irq))
734 if (i < mp_irq_entries) {
736 for (apic = 0; apic < nr_ioapics; apic++) {
737 if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic)
746 * Find a specific PCI IRQ entry.
747 * Not an __init, possibly needed by modules
749 static int pin_2_irq(int idx, int apic, int pin);
751 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
753 int apic, i, best_guess = -1;
755 apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, "
756 "slot:%d, pin:%d.\n", bus, slot, pin);
757 if (test_bit(bus, mp_bus_not_pci)) {
758 printk(KERN_WARNING "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
761 for (i = 0; i < mp_irq_entries; i++) {
762 int lbus = mp_irqs[i].mp_srcbus;
764 for (apic = 0; apic < nr_ioapics; apic++)
765 if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic ||
766 mp_irqs[i].mp_dstapic == MP_APIC_ALL)
769 if (!test_bit(lbus, mp_bus_not_pci) &&
770 !mp_irqs[i].mp_irqtype &&
772 (slot == ((mp_irqs[i].mp_srcbusirq >> 2) & 0x1f))) {
773 int irq = pin_2_irq(i, apic, mp_irqs[i].mp_dstirq);
775 if (!(apic || IO_APIC_IRQ(irq)))
778 if (pin == (mp_irqs[i].mp_srcbusirq & 3))
781 * Use the first all-but-pin matching entry as a
782 * best-guess fuzzy result for broken mptables.
790 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
793 * This function currently is only a helper for the i386 smp boot process where
794 * we need to reprogram the ioredtbls to cater for the cpus which have come online
795 * so mask in all cases should simply be TARGET_CPUS
798 void __init setup_ioapic_dest(void)
800 int pin, ioapic, irq, irq_entry;
802 if (skip_ioapic_setup == 1)
805 for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
806 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
807 irq_entry = find_irq_entry(ioapic, pin, mp_INT);
810 irq = pin_2_irq(irq_entry, ioapic, pin);
811 set_ioapic_affinity_irq(irq, TARGET_CPUS);
818 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
820 * EISA Edge/Level control register, ELCR
822 static int EISA_ELCR(unsigned int irq)
825 unsigned int port = 0x4d0 + (irq >> 3);
826 return (inb(port) >> (irq & 7)) & 1;
828 apic_printk(APIC_VERBOSE, KERN_INFO
829 "Broken MPtable reports ISA irq %d\n", irq);
834 /* ISA interrupts are always polarity zero edge triggered,
835 * when listed as conforming in the MP table. */
837 #define default_ISA_trigger(idx) (0)
838 #define default_ISA_polarity(idx) (0)
840 /* EISA interrupts are always polarity zero and can be edge or level
841 * trigger depending on the ELCR value. If an interrupt is listed as
842 * EISA conforming in the MP table, that means its trigger type must
843 * be read in from the ELCR */
845 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].mp_srcbusirq))
846 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
848 /* PCI interrupts are always polarity one level triggered,
849 * when listed as conforming in the MP table. */
851 #define default_PCI_trigger(idx) (1)
852 #define default_PCI_polarity(idx) (1)
854 /* MCA interrupts are always polarity zero level triggered,
855 * when listed as conforming in the MP table. */
857 #define default_MCA_trigger(idx) (1)
858 #define default_MCA_polarity(idx) default_ISA_polarity(idx)
860 static int MPBIOS_polarity(int idx)
862 int bus = mp_irqs[idx].mp_srcbus;
866 * Determine IRQ line polarity (high active or low active):
868 switch (mp_irqs[idx].mp_irqflag & 3) {
869 case 0: /* conforms, ie. bus-type dependent polarity */
871 polarity = test_bit(bus, mp_bus_not_pci)?
872 default_ISA_polarity(idx):
873 default_PCI_polarity(idx);
876 case 1: /* high active */
881 case 2: /* reserved */
883 printk(KERN_WARNING "broken BIOS!!\n");
887 case 3: /* low active */
892 default: /* invalid */
894 printk(KERN_WARNING "broken BIOS!!\n");
902 static int MPBIOS_trigger(int idx)
904 int bus = mp_irqs[idx].mp_srcbus;
908 * Determine IRQ trigger mode (edge or level sensitive):
910 switch ((mp_irqs[idx].mp_irqflag>>2) & 3) {
911 case 0: /* conforms, ie. bus-type dependent */
913 trigger = test_bit(bus, mp_bus_not_pci)?
914 default_ISA_trigger(idx):
915 default_PCI_trigger(idx);
916 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
917 switch (mp_bus_id_to_type[bus]) {
918 case MP_BUS_ISA: /* ISA pin */
920 /* set before the switch */
923 case MP_BUS_EISA: /* EISA pin */
925 trigger = default_EISA_trigger(idx);
928 case MP_BUS_PCI: /* PCI pin */
930 /* set before the switch */
933 case MP_BUS_MCA: /* MCA pin */
935 trigger = default_MCA_trigger(idx);
940 printk(KERN_WARNING "broken BIOS!!\n");
953 case 2: /* reserved */
955 printk(KERN_WARNING "broken BIOS!!\n");
964 default: /* invalid */
966 printk(KERN_WARNING "broken BIOS!!\n");
974 static inline int irq_polarity(int idx)
976 return MPBIOS_polarity(idx);
979 static inline int irq_trigger(int idx)
981 return MPBIOS_trigger(idx);
984 static int pin_2_irq(int idx, int apic, int pin)
987 int bus = mp_irqs[idx].mp_srcbus;
990 * Debugging check, we are in big trouble if this message pops up!
992 if (mp_irqs[idx].mp_dstirq != pin)
993 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
995 if (test_bit(bus, mp_bus_not_pci))
996 irq = mp_irqs[idx].mp_srcbusirq;
999 * PCI IRQs are mapped in order
1003 irq += nr_ioapic_registers[i++];
1007 * For MPS mode, so far only needed by ES7000 platform
1009 if (ioapic_renumber_irq)
1010 irq = ioapic_renumber_irq(apic, irq);
1014 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1016 if ((pin >= 16) && (pin <= 23)) {
1017 if (pirq_entries[pin-16] != -1) {
1018 if (!pirq_entries[pin-16]) {
1019 apic_printk(APIC_VERBOSE, KERN_DEBUG
1020 "disabling PIRQ%d\n", pin-16);
1022 irq = pirq_entries[pin-16];
1023 apic_printk(APIC_VERBOSE, KERN_DEBUG
1024 "using PIRQ%d -> IRQ %d\n",
1032 static inline int IO_APIC_irq_trigger(int irq)
1036 for (apic = 0; apic < nr_ioapics; apic++) {
1037 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1038 idx = find_irq_entry(apic, pin, mp_INT);
1039 if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
1040 return irq_trigger(idx);
1044 * nonexistent IRQs are edge default
1050 static int __assign_irq_vector(int irq)
1052 static int current_vector = FIRST_DEVICE_VECTOR, current_offset;
1054 struct irq_cfg *cfg;
1057 if (cfg->vector > 0)
1060 vector = current_vector;
1061 offset = current_offset;
1064 if (vector >= first_system_vector) {
1065 offset = (offset + 1) % 8;
1066 vector = FIRST_DEVICE_VECTOR + offset;
1068 if (vector == current_vector)
1070 if (test_and_set_bit(vector, used_vectors))
1073 current_vector = vector;
1074 current_offset = offset;
1075 cfg->vector = vector;
1080 static int assign_irq_vector(int irq)
1082 unsigned long flags;
1085 spin_lock_irqsave(&vector_lock, flags);
1086 vector = __assign_irq_vector(irq);
1087 spin_unlock_irqrestore(&vector_lock, flags);
1092 static struct irq_chip ioapic_chip;
1094 #define IOAPIC_AUTO -1
1095 #define IOAPIC_EDGE 0
1096 #define IOAPIC_LEVEL 1
1098 static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
1100 struct irq_desc *desc;
1102 /* first time to use this irq_desc */
1104 desc = irq_to_desc(irq);
1106 desc = irq_to_desc_alloc(irq);
1108 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1109 trigger == IOAPIC_LEVEL) {
1110 desc->status |= IRQ_LEVEL;
1111 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1112 handle_fasteoi_irq, "fasteoi");
1114 desc->status &= ~IRQ_LEVEL;
1115 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1116 handle_edge_irq, "edge");
1118 set_intr_gate(vector, interrupt[irq]);
1121 static void __init setup_IO_APIC_irqs(void)
1123 struct IO_APIC_route_entry entry;
1124 int apic, pin, idx, irq, first_notcon = 1, vector;
1126 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1128 for (apic = 0; apic < nr_ioapics; apic++) {
1129 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1132 * add it to the IO-APIC irq-routing table:
1134 memset(&entry, 0, sizeof(entry));
1136 entry.delivery_mode = INT_DELIVERY_MODE;
1137 entry.dest_mode = INT_DEST_MODE;
1138 entry.mask = 0; /* enable IRQ */
1139 entry.dest.logical.logical_dest =
1140 cpu_mask_to_apicid(TARGET_CPUS);
1142 idx = find_irq_entry(apic, pin, mp_INT);
1145 apic_printk(APIC_VERBOSE, KERN_DEBUG
1146 " IO-APIC (apicid-pin) %d-%d",
1147 mp_ioapics[apic].mp_apicid,
1151 apic_printk(APIC_VERBOSE, ", %d-%d",
1152 mp_ioapics[apic].mp_apicid, pin);
1156 if (!first_notcon) {
1157 apic_printk(APIC_VERBOSE, " not connected.\n");
1161 entry.trigger = irq_trigger(idx);
1162 entry.polarity = irq_polarity(idx);
1164 if (irq_trigger(idx)) {
1169 irq = pin_2_irq(idx, apic, pin);
1171 * skip adding the timer int on secondary nodes, which causes
1172 * a small but painful rift in the time-space continuum
1174 if (multi_timer_check(apic, irq))
1177 add_pin_to_irq(irq, apic, pin);
1179 if (!apic && !IO_APIC_IRQ(irq))
1182 if (IO_APIC_IRQ(irq)) {
1183 vector = assign_irq_vector(irq);
1184 entry.vector = vector;
1185 ioapic_register_intr(irq, vector, IOAPIC_AUTO);
1187 if (!apic && (irq < 16))
1188 disable_8259A_irq(irq);
1190 ioapic_write_entry(apic, pin, entry);
1195 apic_printk(APIC_VERBOSE, " not connected.\n");
1199 * Set up the timer pin, possibly with the 8259A-master behind.
1201 static void __init setup_timer_IRQ0_pin(unsigned int apic, unsigned int pin,
1204 struct IO_APIC_route_entry entry;
1206 memset(&entry, 0, sizeof(entry));
1209 * We use logical delivery to get the timer IRQ
1212 entry.dest_mode = INT_DEST_MODE;
1213 entry.mask = 1; /* mask IRQ now */
1214 entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
1215 entry.delivery_mode = INT_DELIVERY_MODE;
1218 entry.vector = vector;
1221 * The timer IRQ doesn't have to know that behind the
1222 * scene we may have a 8259A-master in AEOI mode ...
1224 ioapic_register_intr(0, vector, IOAPIC_EDGE);
1227 * Add it to the IO-APIC irq-routing table:
1229 ioapic_write_entry(apic, pin, entry);
1233 __apicdebuginit(void) print_IO_APIC(void)
1236 union IO_APIC_reg_00 reg_00;
1237 union IO_APIC_reg_01 reg_01;
1238 union IO_APIC_reg_02 reg_02;
1239 union IO_APIC_reg_03 reg_03;
1240 unsigned long flags;
1241 struct irq_cfg *cfg;
1243 if (apic_verbosity == APIC_QUIET)
1246 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1247 for (i = 0; i < nr_ioapics; i++)
1248 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1249 mp_ioapics[i].mp_apicid, nr_ioapic_registers[i]);
1252 * We are a bit conservative about what we expect. We have to
1253 * know about every hardware change ASAP.
1255 printk(KERN_INFO "testing the IO APIC.......................\n");
1257 for (apic = 0; apic < nr_ioapics; apic++) {
1259 spin_lock_irqsave(&ioapic_lock, flags);
1260 reg_00.raw = io_apic_read(apic, 0);
1261 reg_01.raw = io_apic_read(apic, 1);
1262 if (reg_01.bits.version >= 0x10)
1263 reg_02.raw = io_apic_read(apic, 2);
1264 if (reg_01.bits.version >= 0x20)
1265 reg_03.raw = io_apic_read(apic, 3);
1266 spin_unlock_irqrestore(&ioapic_lock, flags);
1268 printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mp_apicid);
1269 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1270 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1271 printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
1272 printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
1274 printk(KERN_DEBUG ".... register #01: %08X\n", reg_01.raw);
1275 printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
1277 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1278 printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
1281 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1282 * but the value of reg_02 is read as the previous read register
1283 * value, so ignore it if reg_02 == reg_01.
1285 if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1286 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1287 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1291 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1292 * or reg_03, but the value of reg_0[23] is read as the previous read
1293 * register value, so ignore it if reg_03 == reg_0[12].
1295 if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1296 reg_03.raw != reg_01.raw) {
1297 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1298 printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
1301 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1303 printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol"
1304 " Stat Dest Deli Vect: \n");
1306 for (i = 0; i <= reg_01.bits.entries; i++) {
1307 struct IO_APIC_route_entry entry;
1309 entry = ioapic_read_entry(apic, i);
1311 printk(KERN_DEBUG " %02x %03X %02X ",
1313 entry.dest.logical.logical_dest,
1314 entry.dest.physical.physical_dest
1317 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1322 entry.delivery_status,
1324 entry.delivery_mode,
1329 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1330 for_each_irq_cfg(cfg) {
1331 struct irq_pin_list *entry = cfg->irq_2_pin;
1334 printk(KERN_DEBUG "IRQ%d ", i);
1336 printk("-> %d:%d", entry->apic, entry->pin);
1339 entry = entry->next;
1344 printk(KERN_INFO ".................................... done.\n");
1349 __apicdebuginit(void) print_APIC_bitfield(int base)
1354 if (apic_verbosity == APIC_QUIET)
1357 printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1358 for (i = 0; i < 8; i++) {
1359 v = apic_read(base + i*0x10);
1360 for (j = 0; j < 32; j++) {
1370 __apicdebuginit(void) print_local_APIC(void *dummy)
1372 unsigned int v, ver, maxlvt;
1375 if (apic_verbosity == APIC_QUIET)
1378 printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1379 smp_processor_id(), hard_smp_processor_id());
1380 v = apic_read(APIC_ID);
1381 printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v,
1383 v = apic_read(APIC_LVR);
1384 printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1385 ver = GET_APIC_VERSION(v);
1386 maxlvt = lapic_get_maxlvt();
1388 v = apic_read(APIC_TASKPRI);
1389 printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1391 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1392 v = apic_read(APIC_ARBPRI);
1393 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1394 v & APIC_ARBPRI_MASK);
1395 v = apic_read(APIC_PROCPRI);
1396 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1399 v = apic_read(APIC_EOI);
1400 printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1401 v = apic_read(APIC_RRR);
1402 printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1403 v = apic_read(APIC_LDR);
1404 printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1405 v = apic_read(APIC_DFR);
1406 printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1407 v = apic_read(APIC_SPIV);
1408 printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1410 printk(KERN_DEBUG "... APIC ISR field:\n");
1411 print_APIC_bitfield(APIC_ISR);
1412 printk(KERN_DEBUG "... APIC TMR field:\n");
1413 print_APIC_bitfield(APIC_TMR);
1414 printk(KERN_DEBUG "... APIC IRR field:\n");
1415 print_APIC_bitfield(APIC_IRR);
1417 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1418 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
1419 apic_write(APIC_ESR, 0);
1420 v = apic_read(APIC_ESR);
1421 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1424 icr = apic_icr_read();
1425 printk(KERN_DEBUG "... APIC ICR: %08x\n", icr);
1426 printk(KERN_DEBUG "... APIC ICR2: %08x\n", icr >> 32);
1428 v = apic_read(APIC_LVTT);
1429 printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1431 if (maxlvt > 3) { /* PC is LVT#4. */
1432 v = apic_read(APIC_LVTPC);
1433 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1435 v = apic_read(APIC_LVT0);
1436 printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1437 v = apic_read(APIC_LVT1);
1438 printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1440 if (maxlvt > 2) { /* ERR is LVT#3. */
1441 v = apic_read(APIC_LVTERR);
1442 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1445 v = apic_read(APIC_TMICT);
1446 printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1447 v = apic_read(APIC_TMCCT);
1448 printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1449 v = apic_read(APIC_TDCR);
1450 printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1454 __apicdebuginit(void) print_all_local_APICs(void)
1456 on_each_cpu(print_local_APIC, NULL, 1);
1459 __apicdebuginit(void) print_PIC(void)
1462 unsigned long flags;
1464 if (apic_verbosity == APIC_QUIET)
1467 printk(KERN_DEBUG "\nprinting PIC contents\n");
1469 spin_lock_irqsave(&i8259A_lock, flags);
1471 v = inb(0xa1) << 8 | inb(0x21);
1472 printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
1474 v = inb(0xa0) << 8 | inb(0x20);
1475 printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
1479 v = inb(0xa0) << 8 | inb(0x20);
1483 spin_unlock_irqrestore(&i8259A_lock, flags);
1485 printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
1487 v = inb(0x4d1) << 8 | inb(0x4d0);
1488 printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1491 __apicdebuginit(int) print_all_ICs(void)
1494 print_all_local_APICs();
1500 fs_initcall(print_all_ICs);
1503 static void __init enable_IO_APIC(void)
1505 union IO_APIC_reg_01 reg_01;
1506 int i8259_apic, i8259_pin;
1508 unsigned long flags;
1511 for (i = 0; i < MAX_PIRQS; i++)
1512 pirq_entries[i] = -1;
1515 * The number of IO-APIC IRQ registers (== #pins):
1517 for (apic = 0; apic < nr_ioapics; apic++) {
1518 spin_lock_irqsave(&ioapic_lock, flags);
1519 reg_01.raw = io_apic_read(apic, 1);
1520 spin_unlock_irqrestore(&ioapic_lock, flags);
1521 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1523 for (apic = 0; apic < nr_ioapics; apic++) {
1525 /* See if any of the pins is in ExtINT mode */
1526 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1527 struct IO_APIC_route_entry entry;
1528 entry = ioapic_read_entry(apic, pin);
1531 /* If the interrupt line is enabled and in ExtInt mode
1532 * I have found the pin where the i8259 is connected.
1534 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1535 ioapic_i8259.apic = apic;
1536 ioapic_i8259.pin = pin;
1542 /* Look to see what if the MP table has reported the ExtINT */
1543 /* If we could not find the appropriate pin by looking at the ioapic
1544 * the i8259 probably is not connected the ioapic but give the
1545 * mptable a chance anyway.
1547 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1548 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1549 /* Trust the MP table if nothing is setup in the hardware */
1550 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1551 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1552 ioapic_i8259.pin = i8259_pin;
1553 ioapic_i8259.apic = i8259_apic;
1555 /* Complain if the MP table and the hardware disagree */
1556 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1557 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1559 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1563 * Do not trust the IO-APIC being empty at bootup
1569 * Not an __init, needed by the reboot code
1571 void disable_IO_APIC(void)
1574 * Clear the IO-APIC before rebooting:
1579 * If the i8259 is routed through an IOAPIC
1580 * Put that IOAPIC in virtual wire mode
1581 * so legacy interrupts can be delivered.
1583 if (ioapic_i8259.pin != -1) {
1584 struct IO_APIC_route_entry entry;
1586 memset(&entry, 0, sizeof(entry));
1587 entry.mask = 0; /* Enabled */
1588 entry.trigger = 0; /* Edge */
1590 entry.polarity = 0; /* High */
1591 entry.delivery_status = 0;
1592 entry.dest_mode = 0; /* Physical */
1593 entry.delivery_mode = dest_ExtINT; /* ExtInt */
1595 entry.dest.physical.physical_dest = read_apic_id();
1598 * Add it to the IO-APIC irq-routing table:
1600 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1602 disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1606 * function to set the IO-APIC physical IDs based on the
1607 * values stored in the MPC table.
1609 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
1612 static void __init setup_ioapic_ids_from_mpc(void)
1614 union IO_APIC_reg_00 reg_00;
1615 physid_mask_t phys_id_present_map;
1618 unsigned char old_id;
1619 unsigned long flags;
1621 if (x86_quirks->setup_ioapic_ids && x86_quirks->setup_ioapic_ids())
1625 * Don't check I/O APIC IDs for xAPIC systems. They have
1626 * no meaning without the serial APIC bus.
1628 if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
1629 || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
1632 * This is broken; anything with a real cpu count has to
1633 * circumvent this idiocy regardless.
1635 phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map);
1638 * Set the IOAPIC ID to the value stored in the MPC table.
1640 for (apic = 0; apic < nr_ioapics; apic++) {
1642 /* Read the register 0 value */
1643 spin_lock_irqsave(&ioapic_lock, flags);
1644 reg_00.raw = io_apic_read(apic, 0);
1645 spin_unlock_irqrestore(&ioapic_lock, flags);
1647 old_id = mp_ioapics[apic].mp_apicid;
1649 if (mp_ioapics[apic].mp_apicid >= get_physical_broadcast()) {
1650 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
1651 apic, mp_ioapics[apic].mp_apicid);
1652 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1654 mp_ioapics[apic].mp_apicid = reg_00.bits.ID;
1658 * Sanity check, is the ID really free? Every APIC in a
1659 * system must have a unique ID or we get lots of nice
1660 * 'stuck on smp_invalidate_needed IPI wait' messages.
1662 if (check_apicid_used(phys_id_present_map,
1663 mp_ioapics[apic].mp_apicid)) {
1664 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
1665 apic, mp_ioapics[apic].mp_apicid);
1666 for (i = 0; i < get_physical_broadcast(); i++)
1667 if (!physid_isset(i, phys_id_present_map))
1669 if (i >= get_physical_broadcast())
1670 panic("Max APIC ID exceeded!\n");
1671 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1673 physid_set(i, phys_id_present_map);
1674 mp_ioapics[apic].mp_apicid = i;
1677 tmp = apicid_to_cpu_present(mp_ioapics[apic].mp_apicid);
1678 apic_printk(APIC_VERBOSE, "Setting %d in the "
1679 "phys_id_present_map\n",
1680 mp_ioapics[apic].mp_apicid);
1681 physids_or(phys_id_present_map, phys_id_present_map, tmp);
1686 * We need to adjust the IRQ routing table
1687 * if the ID changed.
1689 if (old_id != mp_ioapics[apic].mp_apicid)
1690 for (i = 0; i < mp_irq_entries; i++)
1691 if (mp_irqs[i].mp_dstapic == old_id)
1692 mp_irqs[i].mp_dstapic
1693 = mp_ioapics[apic].mp_apicid;
1696 * Read the right value from the MPC table and
1697 * write it into the ID register.
1699 apic_printk(APIC_VERBOSE, KERN_INFO
1700 "...changing IO-APIC physical APIC ID to %d ...",
1701 mp_ioapics[apic].mp_apicid);
1703 reg_00.bits.ID = mp_ioapics[apic].mp_apicid;
1704 spin_lock_irqsave(&ioapic_lock, flags);
1705 io_apic_write(apic, 0, reg_00.raw);
1706 spin_unlock_irqrestore(&ioapic_lock, flags);
1711 spin_lock_irqsave(&ioapic_lock, flags);
1712 reg_00.raw = io_apic_read(apic, 0);
1713 spin_unlock_irqrestore(&ioapic_lock, flags);
1714 if (reg_00.bits.ID != mp_ioapics[apic].mp_apicid)
1715 printk("could not set ID!\n");
1717 apic_printk(APIC_VERBOSE, " ok.\n");
1721 int no_timer_check __initdata;
1723 static int __init notimercheck(char *s)
1728 __setup("no_timer_check", notimercheck);
1731 * There is a nasty bug in some older SMP boards, their mptable lies
1732 * about the timer IRQ. We do the following to work around the situation:
1734 * - timer IRQ defaults to IO-APIC IRQ
1735 * - if this function detects that timer IRQs are defunct, then we fall
1736 * back to ISA timer IRQs
1738 static int __init timer_irq_works(void)
1740 unsigned long t1 = jiffies;
1741 unsigned long flags;
1746 local_save_flags(flags);
1748 /* Let ten ticks pass... */
1749 mdelay((10 * 1000) / HZ);
1750 local_irq_restore(flags);
1753 * Expect a few ticks at least, to be sure some possible
1754 * glue logic does not lock up after one or two first
1755 * ticks in a non-ExtINT mode. Also the local APIC
1756 * might have cached one ExtINT interrupt. Finally, at
1757 * least one tick may be lost due to delays.
1759 if (time_after(jiffies, t1 + 4))
1766 * In the SMP+IOAPIC case it might happen that there are an unspecified
1767 * number of pending IRQ events unhandled. These cases are very rare,
1768 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1769 * better to do it this way as thus we do not have to be aware of
1770 * 'pending' interrupts in the IRQ path, except at this point.
1773 * Edge triggered needs to resend any interrupt
1774 * that was delayed but this is now handled in the device
1781 * Starting up a edge-triggered IO-APIC interrupt is
1782 * nasty - we need to make sure that we get the edge.
1783 * If it is already asserted for some reason, we need
1784 * return 1 to indicate that is was pending.
1786 * This is not complete - we should be able to fake
1787 * an edge even if it isn't on the 8259A...
1789 * (We do this for level-triggered IRQs too - it cannot hurt.)
1791 static unsigned int startup_ioapic_irq(unsigned int irq)
1793 int was_pending = 0;
1794 unsigned long flags;
1796 spin_lock_irqsave(&ioapic_lock, flags);
1798 disable_8259A_irq(irq);
1799 if (i8259A_irq_pending(irq))
1802 __unmask_IO_APIC_irq(irq);
1803 spin_unlock_irqrestore(&ioapic_lock, flags);
1808 static void ack_ioapic_irq(unsigned int irq)
1810 move_native_irq(irq);
1814 static void ack_ioapic_quirk_irq(unsigned int irq)
1819 move_native_irq(irq);
1821 * It appears there is an erratum which affects at least version 0x11
1822 * of I/O APIC (that's the 82093AA and cores integrated into various
1823 * chipsets). Under certain conditions a level-triggered interrupt is
1824 * erroneously delivered as edge-triggered one but the respective IRR
1825 * bit gets set nevertheless. As a result the I/O unit expects an EOI
1826 * message but it will never arrive and further interrupts are blocked
1827 * from the source. The exact reason is so far unknown, but the
1828 * phenomenon was observed when two consecutive interrupt requests
1829 * from a given source get delivered to the same CPU and the source is
1830 * temporarily disabled in between.
1832 * A workaround is to simulate an EOI message manually. We achieve it
1833 * by setting the trigger mode to edge and then to level when the edge
1834 * trigger mode gets detected in the TMR of a local APIC for a
1835 * level-triggered interrupt. We mask the source for the time of the
1836 * operation to prevent an edge-triggered interrupt escaping meanwhile.
1837 * The idea is from Manfred Spraul. --macro
1839 i = irq_cfg(irq)->vector;
1841 v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
1845 if (!(v & (1 << (i & 0x1f)))) {
1846 atomic_inc(&irq_mis_count);
1847 spin_lock(&ioapic_lock);
1848 __mask_and_edge_IO_APIC_irq(irq);
1849 __unmask_and_level_IO_APIC_irq(irq);
1850 spin_unlock(&ioapic_lock);
1854 static int ioapic_retrigger_irq(unsigned int irq)
1856 send_IPI_self(irq_cfg(irq)->vector);
1861 static struct irq_chip ioapic_chip __read_mostly = {
1863 .startup = startup_ioapic_irq,
1864 .mask = mask_IO_APIC_irq,
1865 .unmask = unmask_IO_APIC_irq,
1866 .ack = ack_ioapic_irq,
1867 .eoi = ack_ioapic_quirk_irq,
1869 .set_affinity = set_ioapic_affinity_irq,
1871 .retrigger = ioapic_retrigger_irq,
1875 static inline void init_IO_APIC_traps(void)
1878 struct irq_desc *desc;
1879 struct irq_cfg *cfg;
1882 * NOTE! The local APIC isn't very good at handling
1883 * multiple interrupts at the same interrupt level.
1884 * As the interrupt level is determined by taking the
1885 * vector number and shifting that right by 4, we
1886 * want to spread these out a bit so that they don't
1887 * all fall in the same interrupt level.
1889 * Also, we've got to be careful not to trash gate
1890 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1892 for_each_irq_cfg(cfg) {
1894 if (IO_APIC_IRQ(irq) && !cfg->vector) {
1896 * Hmm.. We don't have an entry for this,
1897 * so default to an old-fashioned 8259
1898 * interrupt if we can..
1901 make_8259A_irq(irq);
1903 desc = irq_to_desc(irq);
1904 /* Strange. Oh, well.. */
1905 desc->chip = &no_irq_chip;
1912 * The local APIC irq-chip implementation:
1915 static void ack_lapic_irq(unsigned int irq)
1920 static void mask_lapic_irq(unsigned int irq)
1924 v = apic_read(APIC_LVT0);
1925 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1928 static void unmask_lapic_irq(unsigned int irq)
1932 v = apic_read(APIC_LVT0);
1933 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1936 static struct irq_chip lapic_chip __read_mostly = {
1937 .name = "local-APIC",
1938 .mask = mask_lapic_irq,
1939 .unmask = unmask_lapic_irq,
1940 .ack = ack_lapic_irq,
1943 static void lapic_register_intr(int irq, int vector)
1945 struct irq_desc *desc;
1947 desc = irq_to_desc(irq);
1948 desc->status &= ~IRQ_LEVEL;
1949 set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
1951 set_intr_gate(vector, interrupt[irq]);
1954 static void __init setup_nmi(void)
1957 * Dirty trick to enable the NMI watchdog ...
1958 * We put the 8259A master into AEOI mode and
1959 * unmask on all local APICs LVT0 as NMI.
1961 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1962 * is from Maciej W. Rozycki - so we do not have to EOI from
1963 * the NMI handler or the timer interrupt.
1965 apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
1967 enable_NMI_through_LVT0();
1969 apic_printk(APIC_VERBOSE, " done.\n");
1973 * This looks a bit hackish but it's about the only one way of sending
1974 * a few INTA cycles to 8259As and any associated glue logic. ICR does
1975 * not support the ExtINT mode, unfortunately. We need to send these
1976 * cycles as some i82489DX-based boards have glue logic that keeps the
1977 * 8259A interrupt line asserted until INTA. --macro
1979 static inline void __init unlock_ExtINT_logic(void)
1982 struct IO_APIC_route_entry entry0, entry1;
1983 unsigned char save_control, save_freq_select;
1985 pin = find_isa_irq_pin(8, mp_INT);
1990 apic = find_isa_irq_apic(8, mp_INT);
1996 entry0 = ioapic_read_entry(apic, pin);
1997 clear_IO_APIC_pin(apic, pin);
1999 memset(&entry1, 0, sizeof(entry1));
2001 entry1.dest_mode = 0; /* physical delivery */
2002 entry1.mask = 0; /* unmask IRQ now */
2003 entry1.dest.physical.physical_dest = hard_smp_processor_id();
2004 entry1.delivery_mode = dest_ExtINT;
2005 entry1.polarity = entry0.polarity;
2009 ioapic_write_entry(apic, pin, entry1);
2011 save_control = CMOS_READ(RTC_CONTROL);
2012 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2013 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2015 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2020 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2024 CMOS_WRITE(save_control, RTC_CONTROL);
2025 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2026 clear_IO_APIC_pin(apic, pin);
2028 ioapic_write_entry(apic, pin, entry0);
2032 * This code may look a bit paranoid, but it's supposed to cooperate with
2033 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2034 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2035 * fanatically on his truly buggy board.
2037 static inline void __init check_timer(void)
2039 int apic1, pin1, apic2, pin2;
2043 unsigned long flags;
2045 local_irq_save(flags);
2047 ver = apic_read(APIC_LVR);
2048 ver = GET_APIC_VERSION(ver);
2051 * get/set the timer IRQ vector:
2053 disable_8259A_irq(0);
2054 vector = assign_irq_vector(0);
2055 set_intr_gate(vector, interrupt[0]);
2058 * As IRQ0 is to be enabled in the 8259A, the virtual
2059 * wire has to be disabled in the local APIC. Also
2060 * timer interrupts need to be acknowledged manually in
2061 * the 8259A for the i82489DX when using the NMI
2062 * watchdog as that APIC treats NMIs as level-triggered.
2063 * The AEOI mode will finish them in the 8259A
2066 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2068 timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver));
2070 pin1 = find_isa_irq_pin(0, mp_INT);
2071 apic1 = find_isa_irq_apic(0, mp_INT);
2072 pin2 = ioapic_i8259.pin;
2073 apic2 = ioapic_i8259.apic;
2075 apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
2076 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2077 vector, apic1, pin1, apic2, pin2);
2080 * Some BIOS writers are clueless and report the ExtINTA
2081 * I/O APIC input from the cascaded 8259A as the timer
2082 * interrupt input. So just in case, if only one pin
2083 * was found above, try it both directly and through the
2090 } else if (pin2 == -1) {
2097 * Ok, does IRQ0 through the IOAPIC work?
2100 add_pin_to_irq(0, apic1, pin1);
2101 setup_timer_IRQ0_pin(apic1, pin1, vector);
2103 unmask_IO_APIC_irq(0);
2104 if (timer_irq_works()) {
2105 if (nmi_watchdog == NMI_IO_APIC) {
2107 enable_8259A_irq(0);
2109 if (disable_timer_pin_1 > 0)
2110 clear_IO_APIC_pin(0, pin1);
2113 clear_IO_APIC_pin(apic1, pin1);
2115 apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
2116 "8254 timer not connected to IO-APIC\n");
2118 apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
2119 "(IRQ0) through the 8259A ...\n");
2120 apic_printk(APIC_QUIET, KERN_INFO
2121 "..... (found apic %d pin %d) ...\n", apic2, pin2);
2123 * legacy devices should be connected to IO APIC #0
2125 replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
2126 setup_timer_IRQ0_pin(apic2, pin2, vector);
2127 unmask_IO_APIC_irq(0);
2128 enable_8259A_irq(0);
2129 if (timer_irq_works()) {
2130 apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
2131 timer_through_8259 = 1;
2132 if (nmi_watchdog == NMI_IO_APIC) {
2133 disable_8259A_irq(0);
2135 enable_8259A_irq(0);
2140 * Cleanup, just in case ...
2142 disable_8259A_irq(0);
2143 clear_IO_APIC_pin(apic2, pin2);
2144 apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
2147 if (nmi_watchdog == NMI_IO_APIC) {
2148 apic_printk(APIC_QUIET, KERN_WARNING "timer doesn't work "
2149 "through the IO-APIC - disabling NMI Watchdog!\n");
2150 nmi_watchdog = NMI_NONE;
2154 apic_printk(APIC_QUIET, KERN_INFO
2155 "...trying to set up timer as Virtual Wire IRQ...\n");
2157 lapic_register_intr(0, vector);
2158 apic_write(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */
2159 enable_8259A_irq(0);
2161 if (timer_irq_works()) {
2162 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2165 disable_8259A_irq(0);
2166 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
2167 apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
2169 apic_printk(APIC_QUIET, KERN_INFO
2170 "...trying to set up timer as ExtINT IRQ...\n");
2174 apic_write(APIC_LVT0, APIC_DM_EXTINT);
2176 unlock_ExtINT_logic();
2178 if (timer_irq_works()) {
2179 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2182 apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
2183 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
2184 "report. Then try booting with the 'noapic' option.\n");
2186 local_irq_restore(flags);
2190 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
2191 * to devices. However there may be an I/O APIC pin available for
2192 * this interrupt regardless. The pin may be left unconnected, but
2193 * typically it will be reused as an ExtINT cascade interrupt for
2194 * the master 8259A. In the MPS case such a pin will normally be
2195 * reported as an ExtINT interrupt in the MP table. With ACPI
2196 * there is no provision for ExtINT interrupts, and in the absence
2197 * of an override it would be treated as an ordinary ISA I/O APIC
2198 * interrupt, that is edge-triggered and unmasked by default. We
2199 * used to do this, but it caused problems on some systems because
2200 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
2201 * the same ExtINT cascade interrupt to drive the local APIC of the
2202 * bootstrap processor. Therefore we refrain from routing IRQ2 to
2203 * the I/O APIC in all cases now. No actual device should request
2204 * it anyway. --macro
2206 #define PIC_IRQS (1 << PIC_CASCADE_IR)
2208 void __init setup_IO_APIC(void)
2212 /* Reserve all the system vectors. */
2213 for (i = first_system_vector; i < NR_VECTORS; i++)
2214 set_bit(i, used_vectors);
2218 io_apic_irqs = ~PIC_IRQS;
2220 printk("ENABLING IO-APIC IRQs\n");
2223 * Set up IO-APIC IRQ routing.
2226 setup_ioapic_ids_from_mpc();
2228 setup_IO_APIC_irqs();
2229 init_IO_APIC_traps();
2234 * Called after all the initialization is done. If we didnt find any
2235 * APIC bugs then we can allow the modify fast path
2238 static int __init io_apic_bug_finalize(void)
2240 if (sis_apic_bug == -1)
2245 late_initcall(io_apic_bug_finalize);
2247 struct sysfs_ioapic_data {
2248 struct sys_device dev;
2249 struct IO_APIC_route_entry entry[0];
2251 static struct sysfs_ioapic_data *mp_ioapic_data[MAX_IO_APICS];
2253 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
2255 struct IO_APIC_route_entry *entry;
2256 struct sysfs_ioapic_data *data;
2259 data = container_of(dev, struct sysfs_ioapic_data, dev);
2260 entry = data->entry;
2261 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
2262 entry[i] = ioapic_read_entry(dev->id, i);
2267 static int ioapic_resume(struct sys_device *dev)
2269 struct IO_APIC_route_entry *entry;
2270 struct sysfs_ioapic_data *data;
2271 unsigned long flags;
2272 union IO_APIC_reg_00 reg_00;
2275 data = container_of(dev, struct sysfs_ioapic_data, dev);
2276 entry = data->entry;
2278 spin_lock_irqsave(&ioapic_lock, flags);
2279 reg_00.raw = io_apic_read(dev->id, 0);
2280 if (reg_00.bits.ID != mp_ioapics[dev->id].mp_apicid) {
2281 reg_00.bits.ID = mp_ioapics[dev->id].mp_apicid;
2282 io_apic_write(dev->id, 0, reg_00.raw);
2284 spin_unlock_irqrestore(&ioapic_lock, flags);
2285 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
2286 ioapic_write_entry(dev->id, i, entry[i]);
2291 static struct sysdev_class ioapic_sysdev_class = {
2293 .suspend = ioapic_suspend,
2294 .resume = ioapic_resume,
2297 static int __init ioapic_init_sysfs(void)
2299 struct sys_device *dev;
2300 int i, size, error = 0;
2302 error = sysdev_class_register(&ioapic_sysdev_class);
2306 for (i = 0; i < nr_ioapics; i++) {
2307 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
2308 * sizeof(struct IO_APIC_route_entry);
2309 mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
2310 if (!mp_ioapic_data[i]) {
2311 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2314 dev = &mp_ioapic_data[i]->dev;
2316 dev->cls = &ioapic_sysdev_class;
2317 error = sysdev_register(dev);
2319 kfree(mp_ioapic_data[i]);
2320 mp_ioapic_data[i] = NULL;
2321 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2329 device_initcall(ioapic_init_sysfs);
2332 * Dynamic irq allocate and deallocation
2334 unsigned int create_irq_nr(unsigned int irq_want)
2336 /* Allocate an unused irq */
2337 unsigned int irq, new, vector = 0;
2338 unsigned long flags;
2339 struct irq_cfg *cfg_new;
2341 /* only can use bus/dev/fn.. when per_cpu vector is used */
2342 irq_want = nr_irqs - 1;
2345 spin_lock_irqsave(&vector_lock, flags);
2346 for (new = (nr_irqs - 1); new > 0; new--) {
2347 if (platform_legacy_irq(new))
2349 cfg_new = irq_cfg(new);
2350 if (cfg_new && cfg_new->vector != 0)
2353 cfg_new = irq_cfg_alloc(new);
2354 vector = __assign_irq_vector(new);
2355 if (likely(vector > 0))
2359 spin_unlock_irqrestore(&vector_lock, flags);
2362 set_intr_gate(vector, interrupt[irq]);
2363 dynamic_irq_init(irq);
2368 int create_irq(void)
2370 return create_irq_nr(nr_irqs - 1);
2373 void destroy_irq(unsigned int irq)
2375 unsigned long flags;
2377 dynamic_irq_cleanup(irq);
2379 spin_lock_irqsave(&vector_lock, flags);
2380 clear_bit(irq_cfg(irq)->vector, used_vectors);
2381 irq_cfg(irq)->vector = 0;
2382 spin_unlock_irqrestore(&vector_lock, flags);
2386 * MSI message composition
2388 #ifdef CONFIG_PCI_MSI
2389 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
2394 vector = assign_irq_vector(irq);
2396 dest = cpu_mask_to_apicid(TARGET_CPUS);
2398 msg->address_hi = MSI_ADDR_BASE_HI;
2401 ((INT_DEST_MODE == 0) ?
2402 MSI_ADDR_DEST_MODE_PHYSICAL:
2403 MSI_ADDR_DEST_MODE_LOGICAL) |
2404 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2405 MSI_ADDR_REDIRECTION_CPU:
2406 MSI_ADDR_REDIRECTION_LOWPRI) |
2407 MSI_ADDR_DEST_ID(dest);
2410 MSI_DATA_TRIGGER_EDGE |
2411 MSI_DATA_LEVEL_ASSERT |
2412 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2413 MSI_DATA_DELIVERY_FIXED:
2414 MSI_DATA_DELIVERY_LOWPRI) |
2415 MSI_DATA_VECTOR(vector);
2421 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
2428 cpus_and(tmp, mask, cpu_online_map);
2429 if (cpus_empty(tmp))
2432 vector = assign_irq_vector(irq);
2436 dest = cpu_mask_to_apicid(mask);
2438 read_msi_msg(irq, &msg);
2440 msg.data &= ~MSI_DATA_VECTOR_MASK;
2441 msg.data |= MSI_DATA_VECTOR(vector);
2442 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
2443 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
2445 write_msi_msg(irq, &msg);
2446 irq_to_desc(irq)->affinity = mask;
2448 #endif /* CONFIG_SMP */
2451 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
2452 * which implement the MSI or MSI-X Capability Structure.
2454 static struct irq_chip msi_chip = {
2456 .unmask = unmask_msi_irq,
2457 .mask = mask_msi_irq,
2458 .ack = ack_ioapic_irq,
2460 .set_affinity = set_msi_irq_affinity,
2462 .retrigger = ioapic_retrigger_irq,
2465 static unsigned int build_irq_for_pci_dev(struct pci_dev *dev)
2469 irq = dev->bus->number;
2477 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
2482 unsigned int irq_want;
2484 irq_want = build_irq_for_pci_dev(dev) + 0x100;
2486 irq = create_irq_nr(irq_want);
2491 ret = msi_compose_msg(dev, irq, &msg);
2497 set_irq_msi(irq, desc);
2498 write_msi_msg(irq, &msg);
2500 set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq,
2506 void arch_teardown_msi_irq(unsigned int irq)
2511 #endif /* CONFIG_PCI_MSI */
2514 * Hypertransport interrupt support
2516 #ifdef CONFIG_HT_IRQ
2520 static void target_ht_irq(unsigned int irq, unsigned int dest)
2522 struct ht_irq_msg msg;
2523 fetch_ht_irq_msg(irq, &msg);
2525 msg.address_lo &= ~(HT_IRQ_LOW_DEST_ID_MASK);
2526 msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
2528 msg.address_lo |= HT_IRQ_LOW_DEST_ID(dest);
2529 msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
2531 write_ht_irq_msg(irq, &msg);
2534 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2539 cpus_and(tmp, mask, cpu_online_map);
2540 if (cpus_empty(tmp))
2543 cpus_and(mask, tmp, CPU_MASK_ALL);
2545 dest = cpu_mask_to_apicid(mask);
2547 target_ht_irq(irq, dest);
2548 irq_to_desc(irq)->affinity = mask;
2552 static struct irq_chip ht_irq_chip = {
2554 .mask = mask_ht_irq,
2555 .unmask = unmask_ht_irq,
2556 .ack = ack_ioapic_irq,
2558 .set_affinity = set_ht_irq_affinity,
2560 .retrigger = ioapic_retrigger_irq,
2563 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2567 vector = assign_irq_vector(irq);
2569 struct ht_irq_msg msg;
2574 cpu_set(vector >> 8, tmp);
2575 dest = cpu_mask_to_apicid(tmp);
2577 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
2581 HT_IRQ_LOW_DEST_ID(dest) |
2582 HT_IRQ_LOW_VECTOR(vector) |
2583 ((INT_DEST_MODE == 0) ?
2584 HT_IRQ_LOW_DM_PHYSICAL :
2585 HT_IRQ_LOW_DM_LOGICAL) |
2586 HT_IRQ_LOW_RQEOI_EDGE |
2587 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2588 HT_IRQ_LOW_MT_FIXED :
2589 HT_IRQ_LOW_MT_ARBITRATED) |
2590 HT_IRQ_LOW_IRQ_MASKED;
2592 write_ht_irq_msg(irq, &msg);
2594 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2595 handle_edge_irq, "edge");
2599 #endif /* CONFIG_HT_IRQ */
2601 /* --------------------------------------------------------------------------
2602 ACPI-based IOAPIC Configuration
2603 -------------------------------------------------------------------------- */
2607 int __init io_apic_get_unique_id(int ioapic, int apic_id)
2609 union IO_APIC_reg_00 reg_00;
2610 static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
2612 unsigned long flags;
2616 * The P4 platform supports up to 256 APIC IDs on two separate APIC
2617 * buses (one for LAPICs, one for IOAPICs), where predecessors only
2618 * supports up to 16 on one shared APIC bus.
2620 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
2621 * advantage of new APIC bus architecture.
2624 if (physids_empty(apic_id_map))
2625 apic_id_map = ioapic_phys_id_map(phys_cpu_present_map);
2627 spin_lock_irqsave(&ioapic_lock, flags);
2628 reg_00.raw = io_apic_read(ioapic, 0);
2629 spin_unlock_irqrestore(&ioapic_lock, flags);
2631 if (apic_id >= get_physical_broadcast()) {
2632 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
2633 "%d\n", ioapic, apic_id, reg_00.bits.ID);
2634 apic_id = reg_00.bits.ID;
2638 * Every APIC in a system must have a unique ID or we get lots of nice
2639 * 'stuck on smp_invalidate_needed IPI wait' messages.
2641 if (check_apicid_used(apic_id_map, apic_id)) {
2643 for (i = 0; i < get_physical_broadcast(); i++) {
2644 if (!check_apicid_used(apic_id_map, i))
2648 if (i == get_physical_broadcast())
2649 panic("Max apic_id exceeded!\n");
2651 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
2652 "trying %d\n", ioapic, apic_id, i);
2657 tmp = apicid_to_cpu_present(apic_id);
2658 physids_or(apic_id_map, apic_id_map, tmp);
2660 if (reg_00.bits.ID != apic_id) {
2661 reg_00.bits.ID = apic_id;
2663 spin_lock_irqsave(&ioapic_lock, flags);
2664 io_apic_write(ioapic, 0, reg_00.raw);
2665 reg_00.raw = io_apic_read(ioapic, 0);
2666 spin_unlock_irqrestore(&ioapic_lock, flags);
2669 if (reg_00.bits.ID != apic_id) {
2670 printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
2675 apic_printk(APIC_VERBOSE, KERN_INFO
2676 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
2682 int __init io_apic_get_version(int ioapic)
2684 union IO_APIC_reg_01 reg_01;
2685 unsigned long flags;
2687 spin_lock_irqsave(&ioapic_lock, flags);
2688 reg_01.raw = io_apic_read(ioapic, 1);
2689 spin_unlock_irqrestore(&ioapic_lock, flags);
2691 return reg_01.bits.version;
2695 int __init io_apic_get_redir_entries(int ioapic)
2697 union IO_APIC_reg_01 reg_01;
2698 unsigned long flags;
2700 spin_lock_irqsave(&ioapic_lock, flags);
2701 reg_01.raw = io_apic_read(ioapic, 1);
2702 spin_unlock_irqrestore(&ioapic_lock, flags);
2704 return reg_01.bits.entries;
2708 int io_apic_set_pci_routing(int ioapic, int pin, int irq, int edge_level, int active_high_low)
2710 struct IO_APIC_route_entry entry;
2712 if (!IO_APIC_IRQ(irq)) {
2713 printk(KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2719 * Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
2720 * Note that we mask (disable) IRQs now -- these get enabled when the
2721 * corresponding device driver registers for this IRQ.
2724 memset(&entry, 0, sizeof(entry));
2726 entry.delivery_mode = INT_DELIVERY_MODE;
2727 entry.dest_mode = INT_DEST_MODE;
2728 entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
2729 entry.trigger = edge_level;
2730 entry.polarity = active_high_low;
2734 * IRQs < 16 are already in the irq_2_pin[] map
2737 add_pin_to_irq(irq, ioapic, pin);
2739 entry.vector = assign_irq_vector(irq);
2741 apic_printk(APIC_DEBUG, KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry "
2742 "(%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i)\n", ioapic,
2743 mp_ioapics[ioapic].mp_apicid, pin, entry.vector, irq,
2744 edge_level, active_high_low);
2746 ioapic_register_intr(irq, entry.vector, edge_level);
2748 if (!ioapic && (irq < 16))
2749 disable_8259A_irq(irq);
2751 ioapic_write_entry(ioapic, pin, entry);
2756 int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
2760 if (skip_ioapic_setup)
2763 for (i = 0; i < mp_irq_entries; i++)
2764 if (mp_irqs[i].mp_irqtype == mp_INT &&
2765 mp_irqs[i].mp_srcbusirq == bus_irq)
2767 if (i >= mp_irq_entries)
2770 *trigger = irq_trigger(i);
2771 *polarity = irq_polarity(i);
2775 #endif /* CONFIG_ACPI */
2777 static int __init parse_disable_timer_pin_1(char *arg)
2779 disable_timer_pin_1 = 1;
2782 early_param("disable_timer_pin_1", parse_disable_timer_pin_1);
2784 static int __init parse_enable_timer_pin_1(char *arg)
2786 disable_timer_pin_1 = -1;
2789 early_param("enable_timer_pin_1", parse_enable_timer_pin_1);
2791 static int __init parse_noapic(char *arg)
2793 /* disable IO-APIC */
2794 disable_ioapic_setup();
2797 early_param("noapic", parse_noapic);
2799 void __init ioapic_init_mappings(void)
2801 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
2804 for (i = 0; i < nr_ioapics; i++) {
2805 if (smp_found_config) {
2806 ioapic_phys = mp_ioapics[i].mp_apicaddr;
2809 "WARNING: bogus zero IO-APIC "
2810 "address found in MPTABLE, "
2811 "disabling IO/APIC support!\n");
2812 smp_found_config = 0;
2813 skip_ioapic_setup = 1;
2814 goto fake_ioapic_page;
2818 ioapic_phys = (unsigned long)
2819 alloc_bootmem_pages(PAGE_SIZE);
2820 ioapic_phys = __pa(ioapic_phys);
2822 set_fixmap_nocache(idx, ioapic_phys);
2823 printk(KERN_DEBUG "mapped IOAPIC to %08lx (%08lx)\n",
2824 __fix_to_virt(idx), ioapic_phys);