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/pci.h>
29 #include <linux/mc146818rtc.h>
30 #include <linux/acpi.h>
31 #include <linux/sysdev.h>
32 #include <linux/msi.h>
33 #include <linux/htirq.h>
34 #include <linux/dmar.h>
35 #include <linux/jiffies.h>
37 #include <acpi/acpi_bus.h>
39 #include <linux/bootmem.h>
45 #include <asm/proto.h>
49 #include <asm/msidef.h>
50 #include <asm/hypertransport.h>
53 #include <mach_apic.h>
58 unsigned move_cleanup_count;
60 u8 move_in_progress : 1;
63 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
64 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
65 [0] = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, },
66 [1] = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, },
67 [2] = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, },
68 [3] = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR, },
69 [4] = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR, },
70 [5] = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR, },
71 [6] = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR, },
72 [7] = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR, },
73 [8] = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR, },
74 [9] = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR, },
75 [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
76 [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
77 [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
78 [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
79 [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
80 [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
83 static int assign_irq_vector(int irq, cpumask_t mask);
85 int first_system_vector = 0xfe;
87 char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
89 #define __apicdebuginit __init
91 int sis_apic_bug; /* not actually supported, dummy for compile */
93 static int no_timer_check;
95 static int disable_timer_pin_1 __initdata;
97 int timer_over_8254 __initdata = 1;
99 /* Where if anywhere is the i8259 connect in external int mode */
100 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
102 static DEFINE_SPINLOCK(ioapic_lock);
103 DEFINE_SPINLOCK(vector_lock);
106 * # of IRQ routing registers
108 int nr_ioapic_registers[MAX_IO_APICS];
110 /* I/O APIC entries */
111 struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
114 /* MP IRQ source entries */
115 struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
117 /* # of MP IRQ source entries */
121 * Rough estimation of how many shared IRQs there are, can
122 * be changed anytime.
124 #define MAX_PLUS_SHARED_IRQS NR_IRQS
125 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
128 * This is performance-critical, we want to do it O(1)
130 * the indexing order of this array favors 1:1 mappings
131 * between pins and IRQs.
134 static struct irq_pin_list {
135 short apic, pin, next;
136 } irq_2_pin[PIN_MAP_SIZE];
140 unsigned int unused[3];
144 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
146 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
147 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
150 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
152 struct io_apic __iomem *io_apic = io_apic_base(apic);
153 writel(reg, &io_apic->index);
154 return readl(&io_apic->data);
157 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
159 struct io_apic __iomem *io_apic = io_apic_base(apic);
160 writel(reg, &io_apic->index);
161 writel(value, &io_apic->data);
165 * Re-write a value: to be used for read-modify-write
166 * cycles where the read already set up the index register.
168 static inline void io_apic_modify(unsigned int apic, unsigned int value)
170 struct io_apic __iomem *io_apic = io_apic_base(apic);
171 writel(value, &io_apic->data);
174 static bool io_apic_level_ack_pending(unsigned int irq)
176 struct irq_pin_list *entry;
179 spin_lock_irqsave(&ioapic_lock, flags);
180 entry = irq_2_pin + irq;
188 reg = io_apic_read(entry->apic, 0x10 + pin*2);
189 /* Is the remote IRR bit set? */
190 if ((reg >> 14) & 1) {
191 spin_unlock_irqrestore(&ioapic_lock, flags);
196 entry = irq_2_pin + entry->next;
198 spin_unlock_irqrestore(&ioapic_lock, flags);
204 * Synchronize the IO-APIC and the CPU by doing
205 * a dummy read from the IO-APIC
207 static inline void io_apic_sync(unsigned int apic)
209 struct io_apic __iomem *io_apic = io_apic_base(apic);
210 readl(&io_apic->data);
213 #define __DO_ACTION(R, ACTION, FINAL) \
217 struct irq_pin_list *entry = irq_2_pin + irq; \
219 BUG_ON(irq >= NR_IRQS); \
225 reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
227 io_apic_modify(entry->apic, reg); \
231 entry = irq_2_pin + entry->next; \
236 struct { u32 w1, w2; };
237 struct IO_APIC_route_entry entry;
240 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
242 union entry_union eu;
244 spin_lock_irqsave(&ioapic_lock, flags);
245 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
246 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
247 spin_unlock_irqrestore(&ioapic_lock, flags);
252 * When we write a new IO APIC routing entry, we need to write the high
253 * word first! If the mask bit in the low word is clear, we will enable
254 * the interrupt, and we need to make sure the entry is fully populated
255 * before that happens.
258 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
260 union entry_union eu;
262 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
263 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
266 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
269 spin_lock_irqsave(&ioapic_lock, flags);
270 __ioapic_write_entry(apic, pin, e);
271 spin_unlock_irqrestore(&ioapic_lock, flags);
275 * When we mask an IO APIC routing entry, we need to write the low
276 * word first, in order to set the mask bit before we change the
279 static void ioapic_mask_entry(int apic, int pin)
282 union entry_union eu = { .entry.mask = 1 };
284 spin_lock_irqsave(&ioapic_lock, flags);
285 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
286 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
287 spin_unlock_irqrestore(&ioapic_lock, flags);
291 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
294 struct irq_pin_list *entry = irq_2_pin + irq;
296 BUG_ON(irq >= NR_IRQS);
303 io_apic_write(apic, 0x11 + pin*2, dest);
304 reg = io_apic_read(apic, 0x10 + pin*2);
307 io_apic_modify(apic, reg);
310 entry = irq_2_pin + entry->next;
314 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
316 struct irq_cfg *cfg = irq_cfg + irq;
321 cpus_and(tmp, mask, cpu_online_map);
325 if (assign_irq_vector(irq, mask))
328 cpus_and(tmp, cfg->domain, mask);
329 dest = cpu_mask_to_apicid(tmp);
332 * Only the high 8 bits are valid.
334 dest = SET_APIC_LOGICAL_ID(dest);
336 spin_lock_irqsave(&ioapic_lock, flags);
337 __target_IO_APIC_irq(irq, dest, cfg->vector);
338 irq_desc[irq].affinity = mask;
339 spin_unlock_irqrestore(&ioapic_lock, flags);
344 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
345 * shared ISA-space IRQs, so we have to support them. We are super
346 * fast in the common case, and fast for shared ISA-space IRQs.
348 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
350 static int first_free_entry = NR_IRQS;
351 struct irq_pin_list *entry = irq_2_pin + irq;
353 BUG_ON(irq >= NR_IRQS);
355 entry = irq_2_pin + entry->next;
357 if (entry->pin != -1) {
358 entry->next = first_free_entry;
359 entry = irq_2_pin + entry->next;
360 if (++first_free_entry >= PIN_MAP_SIZE)
361 panic("io_apic.c: ran out of irq_2_pin entries!");
368 #define DO_ACTION(name,R,ACTION, FINAL) \
370 static void name##_IO_APIC_irq (unsigned int irq) \
371 __DO_ACTION(R, ACTION, FINAL)
373 DO_ACTION( __mask, 0, |= 0x00010000, io_apic_sync(entry->apic) )
375 DO_ACTION( __unmask, 0, &= 0xfffeffff, )
378 static void mask_IO_APIC_irq (unsigned int irq)
382 spin_lock_irqsave(&ioapic_lock, flags);
383 __mask_IO_APIC_irq(irq);
384 spin_unlock_irqrestore(&ioapic_lock, flags);
387 static void unmask_IO_APIC_irq (unsigned int irq)
391 spin_lock_irqsave(&ioapic_lock, flags);
392 __unmask_IO_APIC_irq(irq);
393 spin_unlock_irqrestore(&ioapic_lock, flags);
396 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
398 struct IO_APIC_route_entry entry;
400 /* Check delivery_mode to be sure we're not clearing an SMI pin */
401 entry = ioapic_read_entry(apic, pin);
402 if (entry.delivery_mode == dest_SMI)
405 * Disable it in the IO-APIC irq-routing table:
407 ioapic_mask_entry(apic, pin);
410 static void clear_IO_APIC (void)
414 for (apic = 0; apic < nr_ioapics; apic++)
415 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
416 clear_IO_APIC_pin(apic, pin);
419 int skip_ioapic_setup;
422 static int __init parse_noapic(char *str)
424 disable_ioapic_setup();
427 early_param("noapic", parse_noapic);
429 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
430 static int __init disable_timer_pin_setup(char *arg)
432 disable_timer_pin_1 = 1;
435 __setup("disable_timer_pin_1", disable_timer_pin_setup);
437 static int __init setup_disable_8254_timer(char *s)
439 timer_over_8254 = -1;
442 static int __init setup_enable_8254_timer(char *s)
448 __setup("disable_8254_timer", setup_disable_8254_timer);
449 __setup("enable_8254_timer", setup_enable_8254_timer);
453 * Find the IRQ entry number of a certain pin.
455 static int find_irq_entry(int apic, int pin, int type)
459 for (i = 0; i < mp_irq_entries; i++)
460 if (mp_irqs[i].mpc_irqtype == type &&
461 (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
462 mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
463 mp_irqs[i].mpc_dstirq == pin)
470 * Find the pin to which IRQ[irq] (ISA) is connected
472 static int __init find_isa_irq_pin(int irq, int type)
476 for (i = 0; i < mp_irq_entries; i++) {
477 int lbus = mp_irqs[i].mpc_srcbus;
479 if (test_bit(lbus, mp_bus_not_pci) &&
480 (mp_irqs[i].mpc_irqtype == type) &&
481 (mp_irqs[i].mpc_srcbusirq == irq))
483 return mp_irqs[i].mpc_dstirq;
488 static int __init find_isa_irq_apic(int irq, int type)
492 for (i = 0; i < mp_irq_entries; i++) {
493 int lbus = mp_irqs[i].mpc_srcbus;
495 if (test_bit(lbus, mp_bus_not_pci) &&
496 (mp_irqs[i].mpc_irqtype == type) &&
497 (mp_irqs[i].mpc_srcbusirq == irq))
500 if (i < mp_irq_entries) {
502 for(apic = 0; apic < nr_ioapics; apic++) {
503 if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
512 * Find a specific PCI IRQ entry.
513 * Not an __init, possibly needed by modules
515 static int pin_2_irq(int idx, int apic, int pin);
517 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
519 int apic, i, best_guess = -1;
521 apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
523 if (mp_bus_id_to_pci_bus[bus] == -1) {
524 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
527 for (i = 0; i < mp_irq_entries; i++) {
528 int lbus = mp_irqs[i].mpc_srcbus;
530 for (apic = 0; apic < nr_ioapics; apic++)
531 if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
532 mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
535 if (!test_bit(lbus, mp_bus_not_pci) &&
536 !mp_irqs[i].mpc_irqtype &&
538 (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
539 int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
541 if (!(apic || IO_APIC_IRQ(irq)))
544 if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
547 * Use the first all-but-pin matching entry as a
548 * best-guess fuzzy result for broken mptables.
554 BUG_ON(best_guess >= NR_IRQS);
558 /* ISA interrupts are always polarity zero edge triggered,
559 * when listed as conforming in the MP table. */
561 #define default_ISA_trigger(idx) (0)
562 #define default_ISA_polarity(idx) (0)
564 /* PCI interrupts are always polarity one level triggered,
565 * when listed as conforming in the MP table. */
567 #define default_PCI_trigger(idx) (1)
568 #define default_PCI_polarity(idx) (1)
570 static int MPBIOS_polarity(int idx)
572 int bus = mp_irqs[idx].mpc_srcbus;
576 * Determine IRQ line polarity (high active or low active):
578 switch (mp_irqs[idx].mpc_irqflag & 3)
580 case 0: /* conforms, ie. bus-type dependent polarity */
581 if (test_bit(bus, mp_bus_not_pci))
582 polarity = default_ISA_polarity(idx);
584 polarity = default_PCI_polarity(idx);
586 case 1: /* high active */
591 case 2: /* reserved */
593 printk(KERN_WARNING "broken BIOS!!\n");
597 case 3: /* low active */
602 default: /* invalid */
604 printk(KERN_WARNING "broken BIOS!!\n");
612 static int MPBIOS_trigger(int idx)
614 int bus = mp_irqs[idx].mpc_srcbus;
618 * Determine IRQ trigger mode (edge or level sensitive):
620 switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
622 case 0: /* conforms, ie. bus-type dependent */
623 if (test_bit(bus, mp_bus_not_pci))
624 trigger = default_ISA_trigger(idx);
626 trigger = default_PCI_trigger(idx);
633 case 2: /* reserved */
635 printk(KERN_WARNING "broken BIOS!!\n");
644 default: /* invalid */
646 printk(KERN_WARNING "broken BIOS!!\n");
654 static inline int irq_polarity(int idx)
656 return MPBIOS_polarity(idx);
659 static inline int irq_trigger(int idx)
661 return MPBIOS_trigger(idx);
664 static int pin_2_irq(int idx, int apic, int pin)
667 int bus = mp_irqs[idx].mpc_srcbus;
670 * Debugging check, we are in big trouble if this message pops up!
672 if (mp_irqs[idx].mpc_dstirq != pin)
673 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
675 if (test_bit(bus, mp_bus_not_pci)) {
676 irq = mp_irqs[idx].mpc_srcbusirq;
679 * PCI IRQs are mapped in order
683 irq += nr_ioapic_registers[i++];
686 BUG_ON(irq >= NR_IRQS);
690 static int __assign_irq_vector(int irq, cpumask_t mask)
693 * NOTE! The local APIC isn't very good at handling
694 * multiple interrupts at the same interrupt level.
695 * As the interrupt level is determined by taking the
696 * vector number and shifting that right by 4, we
697 * want to spread these out a bit so that they don't
698 * all fall in the same interrupt level.
700 * Also, we've got to be careful not to trash gate
701 * 0x80, because int 0x80 is hm, kind of importantish. ;)
703 static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
704 unsigned int old_vector;
708 BUG_ON((unsigned)irq >= NR_IRQS);
711 /* Only try and allocate irqs on cpus that are present */
712 cpus_and(mask, mask, cpu_online_map);
714 if ((cfg->move_in_progress) || cfg->move_cleanup_count)
717 old_vector = cfg->vector;
720 cpus_and(tmp, cfg->domain, mask);
721 if (!cpus_empty(tmp))
725 for_each_cpu_mask(cpu, mask) {
726 cpumask_t domain, new_mask;
730 domain = vector_allocation_domain(cpu);
731 cpus_and(new_mask, domain, cpu_online_map);
733 vector = current_vector;
734 offset = current_offset;
737 if (vector >= first_system_vector) {
738 /* If we run out of vectors on large boxen, must share them. */
739 offset = (offset + 1) % 8;
740 vector = FIRST_DEVICE_VECTOR + offset;
742 if (unlikely(current_vector == vector))
744 if (vector == IA32_SYSCALL_VECTOR)
746 for_each_cpu_mask(new_cpu, new_mask)
747 if (per_cpu(vector_irq, new_cpu)[vector] != -1)
750 current_vector = vector;
751 current_offset = offset;
753 cfg->move_in_progress = 1;
754 cfg->old_domain = cfg->domain;
756 for_each_cpu_mask(new_cpu, new_mask)
757 per_cpu(vector_irq, new_cpu)[vector] = irq;
758 cfg->vector = vector;
759 cfg->domain = domain;
765 static int assign_irq_vector(int irq, cpumask_t mask)
770 spin_lock_irqsave(&vector_lock, flags);
771 err = __assign_irq_vector(irq, mask);
772 spin_unlock_irqrestore(&vector_lock, flags);
776 static void __clear_irq_vector(int irq)
782 BUG_ON((unsigned)irq >= NR_IRQS);
784 BUG_ON(!cfg->vector);
786 vector = cfg->vector;
787 cpus_and(mask, cfg->domain, cpu_online_map);
788 for_each_cpu_mask(cpu, mask)
789 per_cpu(vector_irq, cpu)[vector] = -1;
792 cpus_clear(cfg->domain);
795 void __setup_vector_irq(int cpu)
797 /* Initialize vector_irq on a new cpu */
798 /* This function must be called with vector_lock held */
801 /* Mark the inuse vectors */
802 for (irq = 0; irq < NR_IRQS; ++irq) {
803 if (!cpu_isset(cpu, irq_cfg[irq].domain))
805 vector = irq_cfg[irq].vector;
806 per_cpu(vector_irq, cpu)[vector] = irq;
808 /* Mark the free vectors */
809 for (vector = 0; vector < NR_VECTORS; ++vector) {
810 irq = per_cpu(vector_irq, cpu)[vector];
813 if (!cpu_isset(cpu, irq_cfg[irq].domain))
814 per_cpu(vector_irq, cpu)[vector] = -1;
819 static struct irq_chip ioapic_chip;
821 static void ioapic_register_intr(int irq, unsigned long trigger)
824 irq_desc[irq].status |= IRQ_LEVEL;
825 set_irq_chip_and_handler_name(irq, &ioapic_chip,
826 handle_fasteoi_irq, "fasteoi");
828 irq_desc[irq].status &= ~IRQ_LEVEL;
829 set_irq_chip_and_handler_name(irq, &ioapic_chip,
830 handle_edge_irq, "edge");
834 static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
835 int trigger, int polarity)
837 struct irq_cfg *cfg = irq_cfg + irq;
838 struct IO_APIC_route_entry entry;
841 if (!IO_APIC_IRQ(irq))
845 if (assign_irq_vector(irq, mask))
848 cpus_and(mask, cfg->domain, mask);
850 apic_printk(APIC_VERBOSE,KERN_DEBUG
851 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
852 "IRQ %d Mode:%i Active:%i)\n",
853 apic, mp_ioapics[apic].mpc_apicid, pin, cfg->vector,
854 irq, trigger, polarity);
857 * add it to the IO-APIC irq-routing table:
859 memset(&entry,0,sizeof(entry));
861 entry.delivery_mode = INT_DELIVERY_MODE;
862 entry.dest_mode = INT_DEST_MODE;
863 entry.dest = cpu_mask_to_apicid(mask);
864 entry.mask = 0; /* enable IRQ */
865 entry.trigger = trigger;
866 entry.polarity = polarity;
867 entry.vector = cfg->vector;
869 /* Mask level triggered irqs.
870 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
875 ioapic_register_intr(irq, trigger);
877 disable_8259A_irq(irq);
879 ioapic_write_entry(apic, pin, entry);
882 static void __init setup_IO_APIC_irqs(void)
884 int apic, pin, idx, irq, first_notcon = 1;
886 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
888 for (apic = 0; apic < nr_ioapics; apic++) {
889 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
891 idx = find_irq_entry(apic,pin,mp_INT);
894 apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
897 apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
901 apic_printk(APIC_VERBOSE, " not connected.\n");
905 irq = pin_2_irq(idx, apic, pin);
906 add_pin_to_irq(irq, apic, pin);
908 setup_IO_APIC_irq(apic, pin, irq,
909 irq_trigger(idx), irq_polarity(idx));
914 apic_printk(APIC_VERBOSE, " not connected.\n");
918 * Set up the 8259A-master output pin as broadcast to all
921 static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
923 struct IO_APIC_route_entry entry;
925 memset(&entry, 0, sizeof(entry));
927 disable_8259A_irq(0);
930 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
933 * We use logical delivery to get the timer IRQ
936 entry.dest_mode = INT_DEST_MODE;
937 entry.mask = 0; /* unmask IRQ now */
938 entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
939 entry.delivery_mode = INT_DELIVERY_MODE;
942 entry.vector = vector;
945 * The timer IRQ doesn't have to know that behind the
946 * scene we have a 8259A-master in AEOI mode ...
948 set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
951 * Add it to the IO-APIC irq-routing table:
953 ioapic_write_entry(apic, pin, entry);
958 void __apicdebuginit print_IO_APIC(void)
961 union IO_APIC_reg_00 reg_00;
962 union IO_APIC_reg_01 reg_01;
963 union IO_APIC_reg_02 reg_02;
966 if (apic_verbosity == APIC_QUIET)
969 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
970 for (i = 0; i < nr_ioapics; i++)
971 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
972 mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
975 * We are a bit conservative about what we expect. We have to
976 * know about every hardware change ASAP.
978 printk(KERN_INFO "testing the IO APIC.......................\n");
980 for (apic = 0; apic < nr_ioapics; apic++) {
982 spin_lock_irqsave(&ioapic_lock, flags);
983 reg_00.raw = io_apic_read(apic, 0);
984 reg_01.raw = io_apic_read(apic, 1);
985 if (reg_01.bits.version >= 0x10)
986 reg_02.raw = io_apic_read(apic, 2);
987 spin_unlock_irqrestore(&ioapic_lock, flags);
990 printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
991 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
992 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
994 printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
995 printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
997 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
998 printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
1000 if (reg_01.bits.version >= 0x10) {
1001 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1002 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1005 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1007 printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
1008 " Stat Dmod Deli Vect: \n");
1010 for (i = 0; i <= reg_01.bits.entries; i++) {
1011 struct IO_APIC_route_entry entry;
1013 entry = ioapic_read_entry(apic, i);
1015 printk(KERN_DEBUG " %02x %03X ",
1020 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1025 entry.delivery_status,
1027 entry.delivery_mode,
1032 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1033 for (i = 0; i < NR_IRQS; i++) {
1034 struct irq_pin_list *entry = irq_2_pin + i;
1037 printk(KERN_DEBUG "IRQ%d ", i);
1039 printk("-> %d:%d", entry->apic, entry->pin);
1042 entry = irq_2_pin + entry->next;
1047 printk(KERN_INFO ".................................... done.\n");
1054 static __apicdebuginit void print_APIC_bitfield (int base)
1059 if (apic_verbosity == APIC_QUIET)
1062 printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1063 for (i = 0; i < 8; i++) {
1064 v = apic_read(base + i*0x10);
1065 for (j = 0; j < 32; j++) {
1075 void __apicdebuginit print_local_APIC(void * dummy)
1077 unsigned int v, ver, maxlvt;
1079 if (apic_verbosity == APIC_QUIET)
1082 printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1083 smp_processor_id(), hard_smp_processor_id());
1084 printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(read_apic_id()));
1085 v = apic_read(APIC_LVR);
1086 printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1087 ver = GET_APIC_VERSION(v);
1088 maxlvt = lapic_get_maxlvt();
1090 v = apic_read(APIC_TASKPRI);
1091 printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1093 v = apic_read(APIC_ARBPRI);
1094 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1095 v & APIC_ARBPRI_MASK);
1096 v = apic_read(APIC_PROCPRI);
1097 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1099 v = apic_read(APIC_EOI);
1100 printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1101 v = apic_read(APIC_RRR);
1102 printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1103 v = apic_read(APIC_LDR);
1104 printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1105 v = apic_read(APIC_DFR);
1106 printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1107 v = apic_read(APIC_SPIV);
1108 printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1110 printk(KERN_DEBUG "... APIC ISR field:\n");
1111 print_APIC_bitfield(APIC_ISR);
1112 printk(KERN_DEBUG "... APIC TMR field:\n");
1113 print_APIC_bitfield(APIC_TMR);
1114 printk(KERN_DEBUG "... APIC IRR field:\n");
1115 print_APIC_bitfield(APIC_IRR);
1117 v = apic_read(APIC_ESR);
1118 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1120 v = apic_read(APIC_ICR);
1121 printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1122 v = apic_read(APIC_ICR2);
1123 printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1125 v = apic_read(APIC_LVTT);
1126 printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1128 if (maxlvt > 3) { /* PC is LVT#4. */
1129 v = apic_read(APIC_LVTPC);
1130 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1132 v = apic_read(APIC_LVT0);
1133 printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1134 v = apic_read(APIC_LVT1);
1135 printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1137 if (maxlvt > 2) { /* ERR is LVT#3. */
1138 v = apic_read(APIC_LVTERR);
1139 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1142 v = apic_read(APIC_TMICT);
1143 printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1144 v = apic_read(APIC_TMCCT);
1145 printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1146 v = apic_read(APIC_TDCR);
1147 printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1151 void print_all_local_APICs (void)
1153 on_each_cpu(print_local_APIC, NULL, 1, 1);
1156 void __apicdebuginit print_PIC(void)
1159 unsigned long flags;
1161 if (apic_verbosity == APIC_QUIET)
1164 printk(KERN_DEBUG "\nprinting PIC contents\n");
1166 spin_lock_irqsave(&i8259A_lock, flags);
1168 v = inb(0xa1) << 8 | inb(0x21);
1169 printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
1171 v = inb(0xa0) << 8 | inb(0x20);
1172 printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
1176 v = inb(0xa0) << 8 | inb(0x20);
1180 spin_unlock_irqrestore(&i8259A_lock, flags);
1182 printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
1184 v = inb(0x4d1) << 8 | inb(0x4d0);
1185 printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1190 void __init enable_IO_APIC(void)
1192 union IO_APIC_reg_01 reg_01;
1193 int i8259_apic, i8259_pin;
1195 unsigned long flags;
1197 for (i = 0; i < PIN_MAP_SIZE; i++) {
1198 irq_2_pin[i].pin = -1;
1199 irq_2_pin[i].next = 0;
1203 * The number of IO-APIC IRQ registers (== #pins):
1205 for (apic = 0; apic < nr_ioapics; apic++) {
1206 spin_lock_irqsave(&ioapic_lock, flags);
1207 reg_01.raw = io_apic_read(apic, 1);
1208 spin_unlock_irqrestore(&ioapic_lock, flags);
1209 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1211 for(apic = 0; apic < nr_ioapics; apic++) {
1213 /* See if any of the pins is in ExtINT mode */
1214 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1215 struct IO_APIC_route_entry entry;
1216 entry = ioapic_read_entry(apic, pin);
1218 /* If the interrupt line is enabled and in ExtInt mode
1219 * I have found the pin where the i8259 is connected.
1221 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1222 ioapic_i8259.apic = apic;
1223 ioapic_i8259.pin = pin;
1229 /* Look to see what if the MP table has reported the ExtINT */
1230 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1231 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1232 /* Trust the MP table if nothing is setup in the hardware */
1233 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1234 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1235 ioapic_i8259.pin = i8259_pin;
1236 ioapic_i8259.apic = i8259_apic;
1238 /* Complain if the MP table and the hardware disagree */
1239 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1240 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1242 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1246 * Do not trust the IO-APIC being empty at bootup
1252 * Not an __init, needed by the reboot code
1254 void disable_IO_APIC(void)
1257 * Clear the IO-APIC before rebooting:
1262 * If the i8259 is routed through an IOAPIC
1263 * Put that IOAPIC in virtual wire mode
1264 * so legacy interrupts can be delivered.
1266 if (ioapic_i8259.pin != -1) {
1267 struct IO_APIC_route_entry entry;
1269 memset(&entry, 0, sizeof(entry));
1270 entry.mask = 0; /* Enabled */
1271 entry.trigger = 0; /* Edge */
1273 entry.polarity = 0; /* High */
1274 entry.delivery_status = 0;
1275 entry.dest_mode = 0; /* Physical */
1276 entry.delivery_mode = dest_ExtINT; /* ExtInt */
1278 entry.dest = GET_APIC_ID(read_apic_id());
1281 * Add it to the IO-APIC irq-routing table:
1283 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1286 disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1290 * There is a nasty bug in some older SMP boards, their mptable lies
1291 * about the timer IRQ. We do the following to work around the situation:
1293 * - timer IRQ defaults to IO-APIC IRQ
1294 * - if this function detects that timer IRQs are defunct, then we fall
1295 * back to ISA timer IRQs
1297 static int __init timer_irq_works(void)
1299 unsigned long t1 = jiffies;
1300 unsigned long flags;
1302 local_save_flags(flags);
1304 /* Let ten ticks pass... */
1305 mdelay((10 * 1000) / HZ);
1306 local_irq_restore(flags);
1309 * Expect a few ticks at least, to be sure some possible
1310 * glue logic does not lock up after one or two first
1311 * ticks in a non-ExtINT mode. Also the local APIC
1312 * might have cached one ExtINT interrupt. Finally, at
1313 * least one tick may be lost due to delays.
1317 if (time_after(jiffies, t1 + 4))
1323 * In the SMP+IOAPIC case it might happen that there are an unspecified
1324 * number of pending IRQ events unhandled. These cases are very rare,
1325 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1326 * better to do it this way as thus we do not have to be aware of
1327 * 'pending' interrupts in the IRQ path, except at this point.
1330 * Edge triggered needs to resend any interrupt
1331 * that was delayed but this is now handled in the device
1336 * Starting up a edge-triggered IO-APIC interrupt is
1337 * nasty - we need to make sure that we get the edge.
1338 * If it is already asserted for some reason, we need
1339 * return 1 to indicate that is was pending.
1341 * This is not complete - we should be able to fake
1342 * an edge even if it isn't on the 8259A...
1345 static unsigned int startup_ioapic_irq(unsigned int irq)
1347 int was_pending = 0;
1348 unsigned long flags;
1350 spin_lock_irqsave(&ioapic_lock, flags);
1352 disable_8259A_irq(irq);
1353 if (i8259A_irq_pending(irq))
1356 __unmask_IO_APIC_irq(irq);
1357 spin_unlock_irqrestore(&ioapic_lock, flags);
1362 static int ioapic_retrigger_irq(unsigned int irq)
1364 struct irq_cfg *cfg = &irq_cfg[irq];
1366 unsigned long flags;
1368 spin_lock_irqsave(&vector_lock, flags);
1369 mask = cpumask_of_cpu(first_cpu(cfg->domain));
1370 send_IPI_mask(mask, cfg->vector);
1371 spin_unlock_irqrestore(&vector_lock, flags);
1377 * Level and edge triggered IO-APIC interrupts need different handling,
1378 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1379 * handled with the level-triggered descriptor, but that one has slightly
1380 * more overhead. Level-triggered interrupts cannot be handled with the
1381 * edge-triggered handler, without risking IRQ storms and other ugly
1386 asmlinkage void smp_irq_move_cleanup_interrupt(void)
1388 unsigned vector, me;
1393 me = smp_processor_id();
1394 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
1396 struct irq_desc *desc;
1397 struct irq_cfg *cfg;
1398 irq = __get_cpu_var(vector_irq)[vector];
1402 desc = irq_desc + irq;
1403 cfg = irq_cfg + irq;
1404 spin_lock(&desc->lock);
1405 if (!cfg->move_cleanup_count)
1408 if ((vector == cfg->vector) && cpu_isset(me, cfg->domain))
1411 __get_cpu_var(vector_irq)[vector] = -1;
1412 cfg->move_cleanup_count--;
1414 spin_unlock(&desc->lock);
1420 static void irq_complete_move(unsigned int irq)
1422 struct irq_cfg *cfg = irq_cfg + irq;
1423 unsigned vector, me;
1425 if (likely(!cfg->move_in_progress))
1428 vector = ~get_irq_regs()->orig_ax;
1429 me = smp_processor_id();
1430 if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) {
1431 cpumask_t cleanup_mask;
1433 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
1434 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
1435 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
1436 cfg->move_in_progress = 0;
1440 static inline void irq_complete_move(unsigned int irq) {}
1443 static void ack_apic_edge(unsigned int irq)
1445 irq_complete_move(irq);
1446 move_native_irq(irq);
1450 static void ack_apic_level(unsigned int irq)
1452 int do_unmask_irq = 0;
1454 irq_complete_move(irq);
1455 #ifdef CONFIG_GENERIC_PENDING_IRQ
1456 /* If we are moving the irq we need to mask it */
1457 if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
1459 mask_IO_APIC_irq(irq);
1464 * We must acknowledge the irq before we move it or the acknowledge will
1465 * not propagate properly.
1469 /* Now we can move and renable the irq */
1470 if (unlikely(do_unmask_irq)) {
1471 /* Only migrate the irq if the ack has been received.
1473 * On rare occasions the broadcast level triggered ack gets
1474 * delayed going to ioapics, and if we reprogram the
1475 * vector while Remote IRR is still set the irq will never
1478 * To prevent this scenario we read the Remote IRR bit
1479 * of the ioapic. This has two effects.
1480 * - On any sane system the read of the ioapic will
1481 * flush writes (and acks) going to the ioapic from
1483 * - We get to see if the ACK has actually been delivered.
1485 * Based on failed experiments of reprogramming the
1486 * ioapic entry from outside of irq context starting
1487 * with masking the ioapic entry and then polling until
1488 * Remote IRR was clear before reprogramming the
1489 * ioapic I don't trust the Remote IRR bit to be
1490 * completey accurate.
1492 * However there appears to be no other way to plug
1493 * this race, so if the Remote IRR bit is not
1494 * accurate and is causing problems then it is a hardware bug
1495 * and you can go talk to the chipset vendor about it.
1497 if (!io_apic_level_ack_pending(irq))
1498 move_masked_irq(irq);
1499 unmask_IO_APIC_irq(irq);
1503 static struct irq_chip ioapic_chip __read_mostly = {
1505 .startup = startup_ioapic_irq,
1506 .mask = mask_IO_APIC_irq,
1507 .unmask = unmask_IO_APIC_irq,
1508 .ack = ack_apic_edge,
1509 .eoi = ack_apic_level,
1511 .set_affinity = set_ioapic_affinity_irq,
1513 .retrigger = ioapic_retrigger_irq,
1516 static inline void init_IO_APIC_traps(void)
1521 * NOTE! The local APIC isn't very good at handling
1522 * multiple interrupts at the same interrupt level.
1523 * As the interrupt level is determined by taking the
1524 * vector number and shifting that right by 4, we
1525 * want to spread these out a bit so that they don't
1526 * all fall in the same interrupt level.
1528 * Also, we've got to be careful not to trash gate
1529 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1531 for (irq = 0; irq < NR_IRQS ; irq++) {
1532 if (IO_APIC_IRQ(irq) && !irq_cfg[irq].vector) {
1534 * Hmm.. We don't have an entry for this,
1535 * so default to an old-fashioned 8259
1536 * interrupt if we can..
1539 make_8259A_irq(irq);
1541 /* Strange. Oh, well.. */
1542 irq_desc[irq].chip = &no_irq_chip;
1547 static void enable_lapic_irq (unsigned int irq)
1551 v = apic_read(APIC_LVT0);
1552 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1555 static void disable_lapic_irq (unsigned int irq)
1559 v = apic_read(APIC_LVT0);
1560 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1563 static void ack_lapic_irq (unsigned int irq)
1568 static void end_lapic_irq (unsigned int i) { /* nothing */ }
1570 static struct hw_interrupt_type lapic_irq_type __read_mostly = {
1571 .name = "local-APIC",
1572 .typename = "local-APIC-edge",
1573 .startup = NULL, /* startup_irq() not used for IRQ0 */
1574 .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
1575 .enable = enable_lapic_irq,
1576 .disable = disable_lapic_irq,
1577 .ack = ack_lapic_irq,
1578 .end = end_lapic_irq,
1581 static void __init setup_nmi(void)
1584 * Dirty trick to enable the NMI watchdog ...
1585 * We put the 8259A master into AEOI mode and
1586 * unmask on all local APICs LVT0 as NMI.
1588 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1589 * is from Maciej W. Rozycki - so we do not have to EOI from
1590 * the NMI handler or the timer interrupt.
1592 printk(KERN_INFO "activating NMI Watchdog ...");
1594 enable_NMI_through_LVT0();
1600 * This looks a bit hackish but it's about the only one way of sending
1601 * a few INTA cycles to 8259As and any associated glue logic. ICR does
1602 * not support the ExtINT mode, unfortunately. We need to send these
1603 * cycles as some i82489DX-based boards have glue logic that keeps the
1604 * 8259A interrupt line asserted until INTA. --macro
1606 static inline void __init unlock_ExtINT_logic(void)
1609 struct IO_APIC_route_entry entry0, entry1;
1610 unsigned char save_control, save_freq_select;
1612 pin = find_isa_irq_pin(8, mp_INT);
1613 apic = find_isa_irq_apic(8, mp_INT);
1617 entry0 = ioapic_read_entry(apic, pin);
1619 clear_IO_APIC_pin(apic, pin);
1621 memset(&entry1, 0, sizeof(entry1));
1623 entry1.dest_mode = 0; /* physical delivery */
1624 entry1.mask = 0; /* unmask IRQ now */
1625 entry1.dest = hard_smp_processor_id();
1626 entry1.delivery_mode = dest_ExtINT;
1627 entry1.polarity = entry0.polarity;
1631 ioapic_write_entry(apic, pin, entry1);
1633 save_control = CMOS_READ(RTC_CONTROL);
1634 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1635 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
1637 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
1642 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
1646 CMOS_WRITE(save_control, RTC_CONTROL);
1647 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1648 clear_IO_APIC_pin(apic, pin);
1650 ioapic_write_entry(apic, pin, entry0);
1654 * This code may look a bit paranoid, but it's supposed to cooperate with
1655 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
1656 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
1657 * fanatically on his truly buggy board.
1659 * FIXME: really need to revamp this for modern platforms only.
1661 static inline void __init check_timer(void)
1663 struct irq_cfg *cfg = irq_cfg + 0;
1664 int apic1, pin1, apic2, pin2;
1665 unsigned long flags;
1667 local_irq_save(flags);
1670 * get/set the timer IRQ vector:
1672 disable_8259A_irq(0);
1673 assign_irq_vector(0, TARGET_CPUS);
1676 * Subtle, code in do_timer_interrupt() expects an AEOI
1677 * mode for the 8259A whenever interrupts are routed
1678 * through I/O APICs. Also IRQ0 has to be enabled in
1679 * the 8259A which implies the virtual wire has to be
1680 * disabled in the local APIC.
1682 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1684 if (timer_over_8254 > 0)
1685 enable_8259A_irq(0);
1687 pin1 = find_isa_irq_pin(0, mp_INT);
1688 apic1 = find_isa_irq_apic(0, mp_INT);
1689 pin2 = ioapic_i8259.pin;
1690 apic2 = ioapic_i8259.apic;
1692 apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
1693 cfg->vector, apic1, pin1, apic2, pin2);
1697 * Ok, does IRQ0 through the IOAPIC work?
1699 unmask_IO_APIC_irq(0);
1700 if (!no_timer_check && timer_irq_works()) {
1701 nmi_watchdog_default();
1702 if (nmi_watchdog == NMI_IO_APIC) {
1703 disable_8259A_irq(0);
1705 enable_8259A_irq(0);
1707 if (disable_timer_pin_1 > 0)
1708 clear_IO_APIC_pin(0, pin1);
1711 clear_IO_APIC_pin(apic1, pin1);
1712 apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
1713 "connected to IO-APIC\n");
1716 apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
1717 "through the 8259A ... ");
1719 apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
1722 * legacy devices should be connected to IO APIC #0
1724 setup_ExtINT_IRQ0_pin(apic2, pin2, cfg->vector);
1725 if (timer_irq_works()) {
1726 apic_printk(APIC_VERBOSE," works.\n");
1727 nmi_watchdog_default();
1728 if (nmi_watchdog == NMI_IO_APIC) {
1734 * Cleanup, just in case ...
1736 clear_IO_APIC_pin(apic2, pin2);
1738 apic_printk(APIC_VERBOSE," failed.\n");
1740 if (nmi_watchdog == NMI_IO_APIC) {
1741 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1745 apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
1747 disable_8259A_irq(0);
1748 irq_desc[0].chip = &lapic_irq_type;
1749 apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
1750 enable_8259A_irq(0);
1752 if (timer_irq_works()) {
1753 apic_printk(APIC_VERBOSE," works.\n");
1756 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
1757 apic_printk(APIC_VERBOSE," failed.\n");
1759 apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
1763 apic_write(APIC_LVT0, APIC_DM_EXTINT);
1765 unlock_ExtINT_logic();
1767 if (timer_irq_works()) {
1768 apic_printk(APIC_VERBOSE," works.\n");
1771 apic_printk(APIC_VERBOSE," failed :(.\n");
1772 panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1774 local_irq_restore(flags);
1777 static int __init notimercheck(char *s)
1782 __setup("no_timer_check", notimercheck);
1786 * IRQs that are handled by the PIC in the MPS IOAPIC case.
1787 * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1788 * Linux doesn't really care, as it's not actually used
1789 * for any interrupt handling anyway.
1791 #define PIC_IRQS (1<<2)
1793 void __init setup_IO_APIC(void)
1797 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
1801 io_apic_irqs = ~0; /* all IRQs go through IOAPIC */
1803 io_apic_irqs = ~PIC_IRQS;
1805 apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
1808 setup_IO_APIC_irqs();
1809 init_IO_APIC_traps();
1815 struct sysfs_ioapic_data {
1816 struct sys_device dev;
1817 struct IO_APIC_route_entry entry[0];
1819 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
1821 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
1823 struct IO_APIC_route_entry *entry;
1824 struct sysfs_ioapic_data *data;
1827 data = container_of(dev, struct sysfs_ioapic_data, dev);
1828 entry = data->entry;
1829 for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
1830 *entry = ioapic_read_entry(dev->id, i);
1835 static int ioapic_resume(struct sys_device *dev)
1837 struct IO_APIC_route_entry *entry;
1838 struct sysfs_ioapic_data *data;
1839 unsigned long flags;
1840 union IO_APIC_reg_00 reg_00;
1843 data = container_of(dev, struct sysfs_ioapic_data, dev);
1844 entry = data->entry;
1846 spin_lock_irqsave(&ioapic_lock, flags);
1847 reg_00.raw = io_apic_read(dev->id, 0);
1848 if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
1849 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
1850 io_apic_write(dev->id, 0, reg_00.raw);
1852 spin_unlock_irqrestore(&ioapic_lock, flags);
1853 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
1854 ioapic_write_entry(dev->id, i, entry[i]);
1859 static struct sysdev_class ioapic_sysdev_class = {
1861 .suspend = ioapic_suspend,
1862 .resume = ioapic_resume,
1865 static int __init ioapic_init_sysfs(void)
1867 struct sys_device * dev;
1870 error = sysdev_class_register(&ioapic_sysdev_class);
1874 for (i = 0; i < nr_ioapics; i++ ) {
1875 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
1876 * sizeof(struct IO_APIC_route_entry);
1877 mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
1878 if (!mp_ioapic_data[i]) {
1879 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1882 dev = &mp_ioapic_data[i]->dev;
1884 dev->cls = &ioapic_sysdev_class;
1885 error = sysdev_register(dev);
1887 kfree(mp_ioapic_data[i]);
1888 mp_ioapic_data[i] = NULL;
1889 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1897 device_initcall(ioapic_init_sysfs);
1900 * Dynamic irq allocate and deallocation
1902 int create_irq(void)
1904 /* Allocate an unused irq */
1907 unsigned long flags;
1910 spin_lock_irqsave(&vector_lock, flags);
1911 for (new = (NR_IRQS - 1); new >= 0; new--) {
1912 if (platform_legacy_irq(new))
1914 if (irq_cfg[new].vector != 0)
1916 if (__assign_irq_vector(new, TARGET_CPUS) == 0)
1920 spin_unlock_irqrestore(&vector_lock, flags);
1923 dynamic_irq_init(irq);
1928 void destroy_irq(unsigned int irq)
1930 unsigned long flags;
1932 dynamic_irq_cleanup(irq);
1934 spin_lock_irqsave(&vector_lock, flags);
1935 __clear_irq_vector(irq);
1936 spin_unlock_irqrestore(&vector_lock, flags);
1940 * MSI message composition
1942 #ifdef CONFIG_PCI_MSI
1943 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
1945 struct irq_cfg *cfg = irq_cfg + irq;
1951 err = assign_irq_vector(irq, tmp);
1953 cpus_and(tmp, cfg->domain, tmp);
1954 dest = cpu_mask_to_apicid(tmp);
1956 msg->address_hi = MSI_ADDR_BASE_HI;
1959 ((INT_DEST_MODE == 0) ?
1960 MSI_ADDR_DEST_MODE_PHYSICAL:
1961 MSI_ADDR_DEST_MODE_LOGICAL) |
1962 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1963 MSI_ADDR_REDIRECTION_CPU:
1964 MSI_ADDR_REDIRECTION_LOWPRI) |
1965 MSI_ADDR_DEST_ID(dest);
1968 MSI_DATA_TRIGGER_EDGE |
1969 MSI_DATA_LEVEL_ASSERT |
1970 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
1971 MSI_DATA_DELIVERY_FIXED:
1972 MSI_DATA_DELIVERY_LOWPRI) |
1973 MSI_DATA_VECTOR(cfg->vector);
1979 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
1981 struct irq_cfg *cfg = irq_cfg + irq;
1986 cpus_and(tmp, mask, cpu_online_map);
1987 if (cpus_empty(tmp))
1990 if (assign_irq_vector(irq, mask))
1993 cpus_and(tmp, cfg->domain, mask);
1994 dest = cpu_mask_to_apicid(tmp);
1996 read_msi_msg(irq, &msg);
1998 msg.data &= ~MSI_DATA_VECTOR_MASK;
1999 msg.data |= MSI_DATA_VECTOR(cfg->vector);
2000 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
2001 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
2003 write_msi_msg(irq, &msg);
2004 irq_desc[irq].affinity = mask;
2006 #endif /* CONFIG_SMP */
2009 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
2010 * which implement the MSI or MSI-X Capability Structure.
2012 static struct irq_chip msi_chip = {
2014 .unmask = unmask_msi_irq,
2015 .mask = mask_msi_irq,
2016 .ack = ack_apic_edge,
2018 .set_affinity = set_msi_irq_affinity,
2020 .retrigger = ioapic_retrigger_irq,
2023 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
2031 ret = msi_compose_msg(dev, irq, &msg);
2037 set_irq_msi(irq, desc);
2038 write_msi_msg(irq, &msg);
2040 set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
2045 void arch_teardown_msi_irq(unsigned int irq)
2052 static void dmar_msi_set_affinity(unsigned int irq, cpumask_t mask)
2054 struct irq_cfg *cfg = irq_cfg + irq;
2059 cpus_and(tmp, mask, cpu_online_map);
2060 if (cpus_empty(tmp))
2063 if (assign_irq_vector(irq, mask))
2066 cpus_and(tmp, cfg->domain, mask);
2067 dest = cpu_mask_to_apicid(tmp);
2069 dmar_msi_read(irq, &msg);
2071 msg.data &= ~MSI_DATA_VECTOR_MASK;
2072 msg.data |= MSI_DATA_VECTOR(cfg->vector);
2073 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
2074 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
2076 dmar_msi_write(irq, &msg);
2077 irq_desc[irq].affinity = mask;
2079 #endif /* CONFIG_SMP */
2081 struct irq_chip dmar_msi_type = {
2083 .unmask = dmar_msi_unmask,
2084 .mask = dmar_msi_mask,
2085 .ack = ack_apic_edge,
2087 .set_affinity = dmar_msi_set_affinity,
2089 .retrigger = ioapic_retrigger_irq,
2092 int arch_setup_dmar_msi(unsigned int irq)
2097 ret = msi_compose_msg(NULL, irq, &msg);
2100 dmar_msi_write(irq, &msg);
2101 set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
2107 #endif /* CONFIG_PCI_MSI */
2109 * Hypertransport interrupt support
2111 #ifdef CONFIG_HT_IRQ
2115 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
2117 struct ht_irq_msg msg;
2118 fetch_ht_irq_msg(irq, &msg);
2120 msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
2121 msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
2123 msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
2124 msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
2126 write_ht_irq_msg(irq, &msg);
2129 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2131 struct irq_cfg *cfg = irq_cfg + irq;
2135 cpus_and(tmp, mask, cpu_online_map);
2136 if (cpus_empty(tmp))
2139 if (assign_irq_vector(irq, mask))
2142 cpus_and(tmp, cfg->domain, mask);
2143 dest = cpu_mask_to_apicid(tmp);
2145 target_ht_irq(irq, dest, cfg->vector);
2146 irq_desc[irq].affinity = mask;
2150 static struct irq_chip ht_irq_chip = {
2152 .mask = mask_ht_irq,
2153 .unmask = unmask_ht_irq,
2154 .ack = ack_apic_edge,
2156 .set_affinity = set_ht_irq_affinity,
2158 .retrigger = ioapic_retrigger_irq,
2161 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2163 struct irq_cfg *cfg = irq_cfg + irq;
2168 err = assign_irq_vector(irq, tmp);
2170 struct ht_irq_msg msg;
2173 cpus_and(tmp, cfg->domain, tmp);
2174 dest = cpu_mask_to_apicid(tmp);
2176 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
2180 HT_IRQ_LOW_DEST_ID(dest) |
2181 HT_IRQ_LOW_VECTOR(cfg->vector) |
2182 ((INT_DEST_MODE == 0) ?
2183 HT_IRQ_LOW_DM_PHYSICAL :
2184 HT_IRQ_LOW_DM_LOGICAL) |
2185 HT_IRQ_LOW_RQEOI_EDGE |
2186 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2187 HT_IRQ_LOW_MT_FIXED :
2188 HT_IRQ_LOW_MT_ARBITRATED) |
2189 HT_IRQ_LOW_IRQ_MASKED;
2191 write_ht_irq_msg(irq, &msg);
2193 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2194 handle_edge_irq, "edge");
2198 #endif /* CONFIG_HT_IRQ */
2200 /* --------------------------------------------------------------------------
2201 ACPI-based IOAPIC Configuration
2202 -------------------------------------------------------------------------- */
2206 #define IO_APIC_MAX_ID 0xFE
2208 int __init io_apic_get_redir_entries (int ioapic)
2210 union IO_APIC_reg_01 reg_01;
2211 unsigned long flags;
2213 spin_lock_irqsave(&ioapic_lock, flags);
2214 reg_01.raw = io_apic_read(ioapic, 1);
2215 spin_unlock_irqrestore(&ioapic_lock, flags);
2217 return reg_01.bits.entries;
2221 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
2223 if (!IO_APIC_IRQ(irq)) {
2224 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2230 * IRQs < 16 are already in the irq_2_pin[] map
2233 add_pin_to_irq(irq, ioapic, pin);
2235 setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
2241 int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
2245 if (skip_ioapic_setup)
2248 for (i = 0; i < mp_irq_entries; i++)
2249 if (mp_irqs[i].mpc_irqtype == mp_INT &&
2250 mp_irqs[i].mpc_srcbusirq == bus_irq)
2252 if (i >= mp_irq_entries)
2255 *trigger = irq_trigger(i);
2256 *polarity = irq_polarity(i);
2260 #endif /* CONFIG_ACPI */
2263 * This function currently is only a helper for the i386 smp boot process where
2264 * we need to reprogram the ioredtbls to cater for the cpus which have come online
2265 * so mask in all cases should simply be TARGET_CPUS
2268 void __init setup_ioapic_dest(void)
2270 int pin, ioapic, irq, irq_entry;
2272 if (skip_ioapic_setup == 1)
2275 for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
2276 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
2277 irq_entry = find_irq_entry(ioapic, pin, mp_INT);
2278 if (irq_entry == -1)
2280 irq = pin_2_irq(irq_entry, ioapic, pin);
2282 /* setup_IO_APIC_irqs could fail to get vector for some device
2283 * when you have too many devices, because at that time only boot
2286 if (!irq_cfg[irq].vector)
2287 setup_IO_APIC_irq(ioapic, pin, irq,
2288 irq_trigger(irq_entry),
2289 irq_polarity(irq_entry));
2291 set_ioapic_affinity_irq(irq, TARGET_CPUS);
2298 #define IOAPIC_RESOURCE_NAME_SIZE 11
2300 static struct resource *ioapic_resources;
2302 static struct resource * __init ioapic_setup_resources(void)
2305 struct resource *res;
2309 if (nr_ioapics <= 0)
2312 n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
2315 mem = alloc_bootmem(n);
2319 mem += sizeof(struct resource) * nr_ioapics;
2321 for (i = 0; i < nr_ioapics; i++) {
2323 res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
2324 sprintf(mem, "IOAPIC %u", i);
2325 mem += IOAPIC_RESOURCE_NAME_SIZE;
2329 ioapic_resources = res;
2334 void __init ioapic_init_mappings(void)
2336 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
2337 struct resource *ioapic_res;
2340 ioapic_res = ioapic_setup_resources();
2341 for (i = 0; i < nr_ioapics; i++) {
2342 if (smp_found_config) {
2343 ioapic_phys = mp_ioapics[i].mpc_apicaddr;
2345 ioapic_phys = (unsigned long)
2346 alloc_bootmem_pages(PAGE_SIZE);
2347 ioapic_phys = __pa(ioapic_phys);
2349 set_fixmap_nocache(idx, ioapic_phys);
2350 apic_printk(APIC_VERBOSE,
2351 "mapped IOAPIC to %016lx (%016lx)\n",
2352 __fix_to_virt(idx), ioapic_phys);
2355 if (ioapic_res != NULL) {
2356 ioapic_res->start = ioapic_phys;
2357 ioapic_res->end = ioapic_phys + (4 * 1024) - 1;
2363 static int __init ioapic_insert_resources(void)
2366 struct resource *r = ioapic_resources;
2370 "IO APIC resources could be not be allocated.\n");
2374 for (i = 0; i < nr_ioapics; i++) {
2375 insert_resource(&iomem_resource, r);
2382 /* Insert the IO APIC resources after PCI initialization has occured to handle
2383 * IO APICS that are mapped in on a BAR in PCI space. */
2384 late_initcall(ioapic_insert_resources);