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>
40 #include <linux/dmar.h>
46 #include <asm/proto.h>
49 #include <asm/i8259.h>
51 #include <asm/msidef.h>
52 #include <asm/hypertransport.h>
53 #include <asm/irq_remapping.h>
56 #include <mach_apic.h>
61 unsigned move_cleanup_count;
63 u8 move_in_progress : 1;
66 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
67 static struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
68 [0] = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, },
69 [1] = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, },
70 [2] = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, },
71 [3] = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR, },
72 [4] = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR, },
73 [5] = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR, },
74 [6] = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR, },
75 [7] = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR, },
76 [8] = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR, },
77 [9] = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR, },
78 [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
79 [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
80 [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
81 [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
82 [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
83 [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
86 static int assign_irq_vector(int irq, cpumask_t mask);
88 int first_system_vector = 0xfe;
90 char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
92 #define __apicdebuginit __init
94 int sis_apic_bug; /* not actually supported, dummy for compile */
96 static int no_timer_check;
98 static int disable_timer_pin_1 __initdata;
100 int timer_through_8259 __initdata;
102 /* Where if anywhere is the i8259 connect in external int mode */
103 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
105 static DEFINE_SPINLOCK(ioapic_lock);
106 static DEFINE_SPINLOCK(vector_lock);
109 * # of IRQ routing registers
111 int nr_ioapic_registers[MAX_IO_APICS];
113 /* I/O APIC RTE contents at the OS boot up */
114 struct IO_APIC_route_entry *early_ioapic_entries[MAX_IO_APICS];
116 /* I/O APIC entries */
117 struct mp_config_ioapic mp_ioapics[MAX_IO_APICS];
120 /* MP IRQ source entries */
121 struct mp_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
123 /* # of MP IRQ source entries */
126 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
129 * Rough estimation of how many shared IRQs there are, can
130 * be changed anytime.
132 #define MAX_PLUS_SHARED_IRQS NR_IRQS
133 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
136 * This is performance-critical, we want to do it O(1)
138 * the indexing order of this array favors 1:1 mappings
139 * between pins and IRQs.
142 static struct irq_pin_list {
143 short apic, pin, next;
144 } irq_2_pin[PIN_MAP_SIZE];
148 unsigned int unused[3];
152 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
154 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
155 + (mp_ioapics[idx].mp_apicaddr & ~PAGE_MASK);
158 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
160 struct io_apic __iomem *io_apic = io_apic_base(apic);
161 writel(reg, &io_apic->index);
162 return readl(&io_apic->data);
165 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
167 struct io_apic __iomem *io_apic = io_apic_base(apic);
168 writel(reg, &io_apic->index);
169 writel(value, &io_apic->data);
173 * Re-write a value: to be used for read-modify-write
174 * cycles where the read already set up the index register.
176 static inline void io_apic_modify(unsigned int apic, unsigned int value)
178 struct io_apic __iomem *io_apic = io_apic_base(apic);
179 writel(value, &io_apic->data);
182 static bool io_apic_level_ack_pending(unsigned int irq)
184 struct irq_pin_list *entry;
187 spin_lock_irqsave(&ioapic_lock, flags);
188 entry = irq_2_pin + irq;
196 reg = io_apic_read(entry->apic, 0x10 + pin*2);
197 /* Is the remote IRR bit set? */
198 if (reg & IO_APIC_REDIR_REMOTE_IRR) {
199 spin_unlock_irqrestore(&ioapic_lock, flags);
204 entry = irq_2_pin + entry->next;
206 spin_unlock_irqrestore(&ioapic_lock, flags);
212 * Synchronize the IO-APIC and the CPU by doing
213 * a dummy read from the IO-APIC
215 static inline void io_apic_sync(unsigned int apic)
217 struct io_apic __iomem *io_apic = io_apic_base(apic);
218 readl(&io_apic->data);
221 #define __DO_ACTION(R, ACTION, FINAL) \
225 struct irq_pin_list *entry = irq_2_pin + irq; \
227 BUG_ON(irq >= NR_IRQS); \
233 reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
235 io_apic_modify(entry->apic, reg); \
239 entry = irq_2_pin + entry->next; \
244 struct { u32 w1, w2; };
245 struct IO_APIC_route_entry entry;
248 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
250 union entry_union eu;
252 spin_lock_irqsave(&ioapic_lock, flags);
253 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
254 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
255 spin_unlock_irqrestore(&ioapic_lock, flags);
260 * When we write a new IO APIC routing entry, we need to write the high
261 * word first! If the mask bit in the low word is clear, we will enable
262 * the interrupt, and we need to make sure the entry is fully populated
263 * before that happens.
266 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
268 union entry_union eu;
270 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
271 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
274 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
277 spin_lock_irqsave(&ioapic_lock, flags);
278 __ioapic_write_entry(apic, pin, e);
279 spin_unlock_irqrestore(&ioapic_lock, flags);
283 * When we mask an IO APIC routing entry, we need to write the low
284 * word first, in order to set the mask bit before we change the
287 static void ioapic_mask_entry(int apic, int pin)
290 union entry_union eu = { .entry.mask = 1 };
292 spin_lock_irqsave(&ioapic_lock, flags);
293 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
294 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
295 spin_unlock_irqrestore(&ioapic_lock, flags);
299 static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
302 struct irq_pin_list *entry = irq_2_pin + irq;
304 BUG_ON(irq >= NR_IRQS);
312 * With interrupt-remapping, destination information comes
313 * from interrupt-remapping table entry.
315 if (!irq_remapped(irq))
316 io_apic_write(apic, 0x11 + pin*2, dest);
317 reg = io_apic_read(apic, 0x10 + pin*2);
318 reg &= ~IO_APIC_REDIR_VECTOR_MASK;
320 io_apic_modify(apic, reg);
323 entry = irq_2_pin + entry->next;
327 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
329 struct irq_cfg *cfg = irq_cfg + irq;
334 cpus_and(tmp, mask, cpu_online_map);
338 if (assign_irq_vector(irq, mask))
341 cpus_and(tmp, cfg->domain, mask);
342 dest = cpu_mask_to_apicid(tmp);
345 * Only the high 8 bits are valid.
347 dest = SET_APIC_LOGICAL_ID(dest);
349 spin_lock_irqsave(&ioapic_lock, flags);
350 __target_IO_APIC_irq(irq, dest, cfg->vector);
351 irq_desc[irq].affinity = mask;
352 spin_unlock_irqrestore(&ioapic_lock, flags);
357 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
358 * shared ISA-space IRQs, so we have to support them. We are super
359 * fast in the common case, and fast for shared ISA-space IRQs.
361 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
363 static int first_free_entry = NR_IRQS;
364 struct irq_pin_list *entry = irq_2_pin + irq;
366 BUG_ON(irq >= NR_IRQS);
368 entry = irq_2_pin + entry->next;
370 if (entry->pin != -1) {
371 entry->next = first_free_entry;
372 entry = irq_2_pin + entry->next;
373 if (++first_free_entry >= PIN_MAP_SIZE)
374 panic("io_apic.c: ran out of irq_2_pin entries!");
381 * Reroute an IRQ to a different pin.
383 static void __init replace_pin_at_irq(unsigned int irq,
384 int oldapic, int oldpin,
385 int newapic, int newpin)
387 struct irq_pin_list *entry = irq_2_pin + irq;
390 if (entry->apic == oldapic && entry->pin == oldpin) {
391 entry->apic = newapic;
396 entry = irq_2_pin + entry->next;
401 #define DO_ACTION(name,R,ACTION, FINAL) \
403 static void name##_IO_APIC_irq (unsigned int irq) \
404 __DO_ACTION(R, ACTION, FINAL)
407 DO_ACTION(__mask, 0, |= IO_APIC_REDIR_MASKED, io_apic_sync(entry->apic))
410 DO_ACTION(__unmask, 0, &= ~IO_APIC_REDIR_MASKED, )
412 static void mask_IO_APIC_irq (unsigned int irq)
416 spin_lock_irqsave(&ioapic_lock, flags);
417 __mask_IO_APIC_irq(irq);
418 spin_unlock_irqrestore(&ioapic_lock, flags);
421 static void unmask_IO_APIC_irq (unsigned int irq)
425 spin_lock_irqsave(&ioapic_lock, flags);
426 __unmask_IO_APIC_irq(irq);
427 spin_unlock_irqrestore(&ioapic_lock, flags);
430 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
432 struct IO_APIC_route_entry entry;
434 /* Check delivery_mode to be sure we're not clearing an SMI pin */
435 entry = ioapic_read_entry(apic, pin);
436 if (entry.delivery_mode == dest_SMI)
439 * Disable it in the IO-APIC irq-routing table:
441 ioapic_mask_entry(apic, pin);
444 static void clear_IO_APIC (void)
448 for (apic = 0; apic < nr_ioapics; apic++)
449 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
450 clear_IO_APIC_pin(apic, pin);
454 * Saves and masks all the unmasked IO-APIC RTE's
456 int save_mask_IO_APIC_setup(void)
458 union IO_APIC_reg_01 reg_01;
463 * The number of IO-APIC IRQ registers (== #pins):
465 for (apic = 0; apic < nr_ioapics; apic++) {
466 spin_lock_irqsave(&ioapic_lock, flags);
467 reg_01.raw = io_apic_read(apic, 1);
468 spin_unlock_irqrestore(&ioapic_lock, flags);
469 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
472 for (apic = 0; apic < nr_ioapics; apic++) {
473 early_ioapic_entries[apic] =
474 kzalloc(sizeof(struct IO_APIC_route_entry) *
475 nr_ioapic_registers[apic], GFP_KERNEL);
476 if (!early_ioapic_entries[apic])
480 for (apic = 0; apic < nr_ioapics; apic++)
481 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
482 struct IO_APIC_route_entry entry;
484 entry = early_ioapic_entries[apic][pin] =
485 ioapic_read_entry(apic, pin);
488 ioapic_write_entry(apic, pin, entry);
494 void restore_IO_APIC_setup(void)
498 for (apic = 0; apic < nr_ioapics; apic++)
499 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
500 ioapic_write_entry(apic, pin,
501 early_ioapic_entries[apic][pin]);
504 void reinit_intr_remapped_IO_APIC(int intr_remapping)
507 * for now plain restore of previous settings.
508 * TBD: In the case of OS enabling interrupt-remapping,
509 * IO-APIC RTE's need to be setup to point to interrupt-remapping
510 * table entries. for now, do a plain restore, and wait for
511 * the setup_IO_APIC_irqs() to do proper initialization.
513 restore_IO_APIC_setup();
516 int skip_ioapic_setup;
519 static int __init parse_noapic(char *str)
521 disable_ioapic_setup();
524 early_param("noapic", parse_noapic);
526 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
527 static int __init disable_timer_pin_setup(char *arg)
529 disable_timer_pin_1 = 1;
532 __setup("disable_timer_pin_1", disable_timer_pin_setup);
536 * Find the IRQ entry number of a certain pin.
538 static int find_irq_entry(int apic, int pin, int type)
542 for (i = 0; i < mp_irq_entries; i++)
543 if (mp_irqs[i].mp_irqtype == type &&
544 (mp_irqs[i].mp_dstapic == mp_ioapics[apic].mp_apicid ||
545 mp_irqs[i].mp_dstapic == MP_APIC_ALL) &&
546 mp_irqs[i].mp_dstirq == pin)
553 * Find the pin to which IRQ[irq] (ISA) is connected
555 static int __init find_isa_irq_pin(int irq, int type)
559 for (i = 0; i < mp_irq_entries; i++) {
560 int lbus = mp_irqs[i].mp_srcbus;
562 if (test_bit(lbus, mp_bus_not_pci) &&
563 (mp_irqs[i].mp_irqtype == type) &&
564 (mp_irqs[i].mp_srcbusirq == irq))
566 return mp_irqs[i].mp_dstirq;
571 static int __init find_isa_irq_apic(int irq, int type)
575 for (i = 0; i < mp_irq_entries; i++) {
576 int lbus = mp_irqs[i].mp_srcbus;
578 if (test_bit(lbus, mp_bus_not_pci) &&
579 (mp_irqs[i].mp_irqtype == type) &&
580 (mp_irqs[i].mp_srcbusirq == irq))
583 if (i < mp_irq_entries) {
585 for(apic = 0; apic < nr_ioapics; apic++) {
586 if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic)
595 * Find a specific PCI IRQ entry.
596 * Not an __init, possibly needed by modules
598 static int pin_2_irq(int idx, int apic, int pin);
600 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
602 int apic, i, best_guess = -1;
604 apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
606 if (test_bit(bus, mp_bus_not_pci)) {
607 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
610 for (i = 0; i < mp_irq_entries; i++) {
611 int lbus = mp_irqs[i].mp_srcbus;
613 for (apic = 0; apic < nr_ioapics; apic++)
614 if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic ||
615 mp_irqs[i].mp_dstapic == MP_APIC_ALL)
618 if (!test_bit(lbus, mp_bus_not_pci) &&
619 !mp_irqs[i].mp_irqtype &&
621 (slot == ((mp_irqs[i].mp_srcbusirq >> 2) & 0x1f))) {
622 int irq = pin_2_irq(i,apic,mp_irqs[i].mp_dstirq);
624 if (!(apic || IO_APIC_IRQ(irq)))
627 if (pin == (mp_irqs[i].mp_srcbusirq & 3))
630 * Use the first all-but-pin matching entry as a
631 * best-guess fuzzy result for broken mptables.
637 BUG_ON(best_guess >= NR_IRQS);
641 /* ISA interrupts are always polarity zero edge triggered,
642 * when listed as conforming in the MP table. */
644 #define default_ISA_trigger(idx) (0)
645 #define default_ISA_polarity(idx) (0)
647 /* PCI interrupts are always polarity one level triggered,
648 * when listed as conforming in the MP table. */
650 #define default_PCI_trigger(idx) (1)
651 #define default_PCI_polarity(idx) (1)
653 static int MPBIOS_polarity(int idx)
655 int bus = mp_irqs[idx].mp_srcbus;
659 * Determine IRQ line polarity (high active or low active):
661 switch (mp_irqs[idx].mp_irqflag & 3)
663 case 0: /* conforms, ie. bus-type dependent polarity */
664 if (test_bit(bus, mp_bus_not_pci))
665 polarity = default_ISA_polarity(idx);
667 polarity = default_PCI_polarity(idx);
669 case 1: /* high active */
674 case 2: /* reserved */
676 printk(KERN_WARNING "broken BIOS!!\n");
680 case 3: /* low active */
685 default: /* invalid */
687 printk(KERN_WARNING "broken BIOS!!\n");
695 static int MPBIOS_trigger(int idx)
697 int bus = mp_irqs[idx].mp_srcbus;
701 * Determine IRQ trigger mode (edge or level sensitive):
703 switch ((mp_irqs[idx].mp_irqflag>>2) & 3)
705 case 0: /* conforms, ie. bus-type dependent */
706 if (test_bit(bus, mp_bus_not_pci))
707 trigger = default_ISA_trigger(idx);
709 trigger = default_PCI_trigger(idx);
716 case 2: /* reserved */
718 printk(KERN_WARNING "broken BIOS!!\n");
727 default: /* invalid */
729 printk(KERN_WARNING "broken BIOS!!\n");
737 static inline int irq_polarity(int idx)
739 return MPBIOS_polarity(idx);
742 static inline int irq_trigger(int idx)
744 return MPBIOS_trigger(idx);
747 static int pin_2_irq(int idx, int apic, int pin)
750 int bus = mp_irqs[idx].mp_srcbus;
753 * Debugging check, we are in big trouble if this message pops up!
755 if (mp_irqs[idx].mp_dstirq != pin)
756 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
758 if (test_bit(bus, mp_bus_not_pci)) {
759 irq = mp_irqs[idx].mp_srcbusirq;
762 * PCI IRQs are mapped in order
766 irq += nr_ioapic_registers[i++];
769 BUG_ON(irq >= NR_IRQS);
773 void lock_vector_lock(void)
775 /* Used to the online set of cpus does not change
776 * during assign_irq_vector.
778 spin_lock(&vector_lock);
781 void unlock_vector_lock(void)
783 spin_unlock(&vector_lock);
786 static int __assign_irq_vector(int irq, cpumask_t mask)
789 * NOTE! The local APIC isn't very good at handling
790 * multiple interrupts at the same interrupt level.
791 * As the interrupt level is determined by taking the
792 * vector number and shifting that right by 4, we
793 * want to spread these out a bit so that they don't
794 * all fall in the same interrupt level.
796 * Also, we've got to be careful not to trash gate
797 * 0x80, because int 0x80 is hm, kind of importantish. ;)
799 static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
800 unsigned int old_vector;
804 BUG_ON((unsigned)irq >= NR_IRQS);
807 /* Only try and allocate irqs on cpus that are present */
808 cpus_and(mask, mask, cpu_online_map);
810 if ((cfg->move_in_progress) || cfg->move_cleanup_count)
813 old_vector = cfg->vector;
816 cpus_and(tmp, cfg->domain, mask);
817 if (!cpus_empty(tmp))
821 for_each_cpu_mask_nr(cpu, mask) {
822 cpumask_t domain, new_mask;
826 domain = vector_allocation_domain(cpu);
827 cpus_and(new_mask, domain, cpu_online_map);
829 vector = current_vector;
830 offset = current_offset;
833 if (vector >= first_system_vector) {
834 /* If we run out of vectors on large boxen, must share them. */
835 offset = (offset + 1) % 8;
836 vector = FIRST_DEVICE_VECTOR + offset;
838 if (unlikely(current_vector == vector))
840 if (vector == IA32_SYSCALL_VECTOR)
842 for_each_cpu_mask_nr(new_cpu, new_mask)
843 if (per_cpu(vector_irq, new_cpu)[vector] != -1)
846 current_vector = vector;
847 current_offset = offset;
849 cfg->move_in_progress = 1;
850 cfg->old_domain = cfg->domain;
852 for_each_cpu_mask_nr(new_cpu, new_mask)
853 per_cpu(vector_irq, new_cpu)[vector] = irq;
854 cfg->vector = vector;
855 cfg->domain = domain;
861 static int assign_irq_vector(int irq, cpumask_t mask)
866 spin_lock_irqsave(&vector_lock, flags);
867 err = __assign_irq_vector(irq, mask);
868 spin_unlock_irqrestore(&vector_lock, flags);
872 static void __clear_irq_vector(int irq)
878 BUG_ON((unsigned)irq >= NR_IRQS);
880 BUG_ON(!cfg->vector);
882 vector = cfg->vector;
883 cpus_and(mask, cfg->domain, cpu_online_map);
884 for_each_cpu_mask_nr(cpu, mask)
885 per_cpu(vector_irq, cpu)[vector] = -1;
888 cpus_clear(cfg->domain);
891 void __setup_vector_irq(int cpu)
893 /* Initialize vector_irq on a new cpu */
894 /* This function must be called with vector_lock held */
897 /* Mark the inuse vectors */
898 for (irq = 0; irq < NR_IRQS; ++irq) {
899 if (!cpu_isset(cpu, irq_cfg[irq].domain))
901 vector = irq_cfg[irq].vector;
902 per_cpu(vector_irq, cpu)[vector] = irq;
904 /* Mark the free vectors */
905 for (vector = 0; vector < NR_VECTORS; ++vector) {
906 irq = per_cpu(vector_irq, cpu)[vector];
909 if (!cpu_isset(cpu, irq_cfg[irq].domain))
910 per_cpu(vector_irq, cpu)[vector] = -1;
914 static struct irq_chip ioapic_chip;
915 #ifdef CONFIG_INTR_REMAP
916 static struct irq_chip ir_ioapic_chip;
919 static void ioapic_register_intr(int irq, unsigned long trigger)
922 irq_desc[irq].status |= IRQ_LEVEL;
924 irq_desc[irq].status &= ~IRQ_LEVEL;
926 #ifdef CONFIG_INTR_REMAP
927 if (irq_remapped(irq)) {
928 irq_desc[irq].status |= IRQ_MOVE_PCNTXT;
930 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
934 set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
935 handle_edge_irq, "edge");
940 set_irq_chip_and_handler_name(irq, &ioapic_chip,
944 set_irq_chip_and_handler_name(irq, &ioapic_chip,
945 handle_edge_irq, "edge");
948 static int setup_ioapic_entry(int apic, int irq,
949 struct IO_APIC_route_entry *entry,
950 unsigned int destination, int trigger,
951 int polarity, int vector)
954 * add it to the IO-APIC irq-routing table:
956 memset(entry,0,sizeof(*entry));
958 #ifdef CONFIG_INTR_REMAP
959 if (intr_remapping_enabled) {
960 struct intel_iommu *iommu = map_ioapic_to_ir(apic);
962 struct IR_IO_APIC_route_entry *ir_entry =
963 (struct IR_IO_APIC_route_entry *) entry;
967 panic("No mapping iommu for ioapic %d\n", apic);
969 index = alloc_irte(iommu, irq, 1);
971 panic("Failed to allocate IRTE for ioapic %d\n", apic);
973 memset(&irte, 0, sizeof(irte));
976 irte.dst_mode = INT_DEST_MODE;
977 irte.trigger_mode = trigger;
978 irte.dlvry_mode = INT_DELIVERY_MODE;
979 irte.vector = vector;
980 irte.dest_id = IRTE_DEST(destination);
982 modify_irte(irq, &irte);
984 ir_entry->index2 = (index >> 15) & 0x1;
986 ir_entry->format = 1;
987 ir_entry->index = (index & 0x7fff);
991 entry->delivery_mode = INT_DELIVERY_MODE;
992 entry->dest_mode = INT_DEST_MODE;
993 entry->dest = destination;
996 entry->mask = 0; /* enable IRQ */
997 entry->trigger = trigger;
998 entry->polarity = polarity;
999 entry->vector = vector;
1001 /* Mask level triggered irqs.
1002 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
1009 static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
1010 int trigger, int polarity)
1012 struct irq_cfg *cfg = irq_cfg + irq;
1013 struct IO_APIC_route_entry entry;
1016 if (!IO_APIC_IRQ(irq))
1020 if (assign_irq_vector(irq, mask))
1023 cpus_and(mask, cfg->domain, mask);
1025 apic_printk(APIC_VERBOSE,KERN_DEBUG
1026 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
1027 "IRQ %d Mode:%i Active:%i)\n",
1028 apic, mp_ioapics[apic].mp_apicid, pin, cfg->vector,
1029 irq, trigger, polarity);
1032 if (setup_ioapic_entry(mp_ioapics[apic].mp_apicid, irq, &entry,
1033 cpu_mask_to_apicid(mask), trigger, polarity,
1035 printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
1036 mp_ioapics[apic].mp_apicid, pin);
1037 __clear_irq_vector(irq);
1041 ioapic_register_intr(irq, trigger);
1043 disable_8259A_irq(irq);
1045 ioapic_write_entry(apic, pin, entry);
1048 static void __init setup_IO_APIC_irqs(void)
1050 int apic, pin, idx, irq, first_notcon = 1;
1052 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1054 for (apic = 0; apic < nr_ioapics; apic++) {
1055 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1057 idx = find_irq_entry(apic,pin,mp_INT);
1060 apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mp_apicid, pin);
1063 apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mp_apicid, pin);
1066 if (!first_notcon) {
1067 apic_printk(APIC_VERBOSE, " not connected.\n");
1071 irq = pin_2_irq(idx, apic, pin);
1072 add_pin_to_irq(irq, apic, pin);
1074 setup_IO_APIC_irq(apic, pin, irq,
1075 irq_trigger(idx), irq_polarity(idx));
1080 apic_printk(APIC_VERBOSE, " not connected.\n");
1084 * Set up the timer pin, possibly with the 8259A-master behind.
1086 static void __init setup_timer_IRQ0_pin(unsigned int apic, unsigned int pin,
1089 struct IO_APIC_route_entry entry;
1091 if (intr_remapping_enabled)
1094 memset(&entry, 0, sizeof(entry));
1097 * We use logical delivery to get the timer IRQ
1100 entry.dest_mode = INT_DEST_MODE;
1101 entry.mask = 1; /* mask IRQ now */
1102 entry.dest = cpu_mask_to_apicid(TARGET_CPUS);
1103 entry.delivery_mode = INT_DELIVERY_MODE;
1106 entry.vector = vector;
1109 * The timer IRQ doesn't have to know that behind the
1110 * scene we may have a 8259A-master in AEOI mode ...
1112 set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
1115 * Add it to the IO-APIC irq-routing table:
1117 ioapic_write_entry(apic, pin, entry);
1120 void __apicdebuginit print_IO_APIC(void)
1123 union IO_APIC_reg_00 reg_00;
1124 union IO_APIC_reg_01 reg_01;
1125 union IO_APIC_reg_02 reg_02;
1126 unsigned long flags;
1128 if (apic_verbosity == APIC_QUIET)
1131 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1132 for (i = 0; i < nr_ioapics; i++)
1133 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1134 mp_ioapics[i].mp_apicid, nr_ioapic_registers[i]);
1137 * We are a bit conservative about what we expect. We have to
1138 * know about every hardware change ASAP.
1140 printk(KERN_INFO "testing the IO APIC.......................\n");
1142 for (apic = 0; apic < nr_ioapics; apic++) {
1144 spin_lock_irqsave(&ioapic_lock, flags);
1145 reg_00.raw = io_apic_read(apic, 0);
1146 reg_01.raw = io_apic_read(apic, 1);
1147 if (reg_01.bits.version >= 0x10)
1148 reg_02.raw = io_apic_read(apic, 2);
1149 spin_unlock_irqrestore(&ioapic_lock, flags);
1152 printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mp_apicid);
1153 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1154 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1156 printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
1157 printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
1159 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1160 printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
1162 if (reg_01.bits.version >= 0x10) {
1163 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1164 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1167 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1169 printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
1170 " Stat Dmod Deli Vect: \n");
1172 for (i = 0; i <= reg_01.bits.entries; i++) {
1173 struct IO_APIC_route_entry entry;
1175 entry = ioapic_read_entry(apic, i);
1177 printk(KERN_DEBUG " %02x %03X ",
1182 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1187 entry.delivery_status,
1189 entry.delivery_mode,
1194 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1195 for (i = 0; i < NR_IRQS; i++) {
1196 struct irq_pin_list *entry = irq_2_pin + i;
1199 printk(KERN_DEBUG "IRQ%d ", i);
1201 printk("-> %d:%d", entry->apic, entry->pin);
1204 entry = irq_2_pin + entry->next;
1209 printk(KERN_INFO ".................................... done.\n");
1216 static __apicdebuginit void print_APIC_bitfield (int base)
1221 if (apic_verbosity == APIC_QUIET)
1224 printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1225 for (i = 0; i < 8; i++) {
1226 v = apic_read(base + i*0x10);
1227 for (j = 0; j < 32; j++) {
1237 void __apicdebuginit print_local_APIC(void * dummy)
1239 unsigned int v, ver, maxlvt;
1242 if (apic_verbosity == APIC_QUIET)
1245 printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1246 smp_processor_id(), hard_smp_processor_id());
1247 v = apic_read(APIC_ID);
1248 printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, read_apic_id());
1249 v = apic_read(APIC_LVR);
1250 printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1251 ver = GET_APIC_VERSION(v);
1252 maxlvt = lapic_get_maxlvt();
1254 v = apic_read(APIC_TASKPRI);
1255 printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1257 v = apic_read(APIC_ARBPRI);
1258 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1259 v & APIC_ARBPRI_MASK);
1260 v = apic_read(APIC_PROCPRI);
1261 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1263 v = apic_read(APIC_EOI);
1264 printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1265 v = apic_read(APIC_RRR);
1266 printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1267 v = apic_read(APIC_LDR);
1268 printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1269 v = apic_read(APIC_DFR);
1270 printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1271 v = apic_read(APIC_SPIV);
1272 printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1274 printk(KERN_DEBUG "... APIC ISR field:\n");
1275 print_APIC_bitfield(APIC_ISR);
1276 printk(KERN_DEBUG "... APIC TMR field:\n");
1277 print_APIC_bitfield(APIC_TMR);
1278 printk(KERN_DEBUG "... APIC IRR field:\n");
1279 print_APIC_bitfield(APIC_IRR);
1281 v = apic_read(APIC_ESR);
1282 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1284 icr = apic_icr_read();
1285 printk(KERN_DEBUG "... APIC ICR: %08x\n", icr);
1286 printk(KERN_DEBUG "... APIC ICR2: %08x\n", icr >> 32);
1288 v = apic_read(APIC_LVTT);
1289 printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1291 if (maxlvt > 3) { /* PC is LVT#4. */
1292 v = apic_read(APIC_LVTPC);
1293 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1295 v = apic_read(APIC_LVT0);
1296 printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1297 v = apic_read(APIC_LVT1);
1298 printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1300 if (maxlvt > 2) { /* ERR is LVT#3. */
1301 v = apic_read(APIC_LVTERR);
1302 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1305 v = apic_read(APIC_TMICT);
1306 printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1307 v = apic_read(APIC_TMCCT);
1308 printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1309 v = apic_read(APIC_TDCR);
1310 printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1314 void print_all_local_APICs (void)
1316 on_each_cpu(print_local_APIC, NULL, 1);
1319 void __apicdebuginit print_PIC(void)
1322 unsigned long flags;
1324 if (apic_verbosity == APIC_QUIET)
1327 printk(KERN_DEBUG "\nprinting PIC contents\n");
1329 spin_lock_irqsave(&i8259A_lock, flags);
1331 v = inb(0xa1) << 8 | inb(0x21);
1332 printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
1334 v = inb(0xa0) << 8 | inb(0x20);
1335 printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
1339 v = inb(0xa0) << 8 | inb(0x20);
1343 spin_unlock_irqrestore(&i8259A_lock, flags);
1345 printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
1347 v = inb(0x4d1) << 8 | inb(0x4d0);
1348 printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1353 void __init enable_IO_APIC(void)
1355 union IO_APIC_reg_01 reg_01;
1356 int i8259_apic, i8259_pin;
1358 unsigned long flags;
1360 for (i = 0; i < PIN_MAP_SIZE; i++) {
1361 irq_2_pin[i].pin = -1;
1362 irq_2_pin[i].next = 0;
1366 * The number of IO-APIC IRQ registers (== #pins):
1368 for (apic = 0; apic < nr_ioapics; apic++) {
1369 spin_lock_irqsave(&ioapic_lock, flags);
1370 reg_01.raw = io_apic_read(apic, 1);
1371 spin_unlock_irqrestore(&ioapic_lock, flags);
1372 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1374 for(apic = 0; apic < nr_ioapics; apic++) {
1376 /* See if any of the pins is in ExtINT mode */
1377 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1378 struct IO_APIC_route_entry entry;
1379 entry = ioapic_read_entry(apic, pin);
1381 /* If the interrupt line is enabled and in ExtInt mode
1382 * I have found the pin where the i8259 is connected.
1384 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1385 ioapic_i8259.apic = apic;
1386 ioapic_i8259.pin = pin;
1392 /* Look to see what if the MP table has reported the ExtINT */
1393 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1394 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1395 /* Trust the MP table if nothing is setup in the hardware */
1396 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1397 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1398 ioapic_i8259.pin = i8259_pin;
1399 ioapic_i8259.apic = i8259_apic;
1401 /* Complain if the MP table and the hardware disagree */
1402 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1403 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1405 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1409 * Do not trust the IO-APIC being empty at bootup
1415 * Not an __init, needed by the reboot code
1417 void disable_IO_APIC(void)
1420 * Clear the IO-APIC before rebooting:
1425 * If the i8259 is routed through an IOAPIC
1426 * Put that IOAPIC in virtual wire mode
1427 * so legacy interrupts can be delivered.
1429 if (ioapic_i8259.pin != -1) {
1430 struct IO_APIC_route_entry entry;
1432 memset(&entry, 0, sizeof(entry));
1433 entry.mask = 0; /* Enabled */
1434 entry.trigger = 0; /* Edge */
1436 entry.polarity = 0; /* High */
1437 entry.delivery_status = 0;
1438 entry.dest_mode = 0; /* Physical */
1439 entry.delivery_mode = dest_ExtINT; /* ExtInt */
1441 entry.dest = read_apic_id();
1444 * Add it to the IO-APIC irq-routing table:
1446 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1449 disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1453 * There is a nasty bug in some older SMP boards, their mptable lies
1454 * about the timer IRQ. We do the following to work around the situation:
1456 * - timer IRQ defaults to IO-APIC IRQ
1457 * - if this function detects that timer IRQs are defunct, then we fall
1458 * back to ISA timer IRQs
1460 static int __init timer_irq_works(void)
1462 unsigned long t1 = jiffies;
1463 unsigned long flags;
1465 local_save_flags(flags);
1467 /* Let ten ticks pass... */
1468 mdelay((10 * 1000) / HZ);
1469 local_irq_restore(flags);
1472 * Expect a few ticks at least, to be sure some possible
1473 * glue logic does not lock up after one or two first
1474 * ticks in a non-ExtINT mode. Also the local APIC
1475 * might have cached one ExtINT interrupt. Finally, at
1476 * least one tick may be lost due to delays.
1480 if (time_after(jiffies, t1 + 4))
1486 * In the SMP+IOAPIC case it might happen that there are an unspecified
1487 * number of pending IRQ events unhandled. These cases are very rare,
1488 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1489 * better to do it this way as thus we do not have to be aware of
1490 * 'pending' interrupts in the IRQ path, except at this point.
1493 * Edge triggered needs to resend any interrupt
1494 * that was delayed but this is now handled in the device
1499 * Starting up a edge-triggered IO-APIC interrupt is
1500 * nasty - we need to make sure that we get the edge.
1501 * If it is already asserted for some reason, we need
1502 * return 1 to indicate that is was pending.
1504 * This is not complete - we should be able to fake
1505 * an edge even if it isn't on the 8259A...
1508 static unsigned int startup_ioapic_irq(unsigned int irq)
1510 int was_pending = 0;
1511 unsigned long flags;
1513 spin_lock_irqsave(&ioapic_lock, flags);
1515 disable_8259A_irq(irq);
1516 if (i8259A_irq_pending(irq))
1519 __unmask_IO_APIC_irq(irq);
1520 spin_unlock_irqrestore(&ioapic_lock, flags);
1525 static int ioapic_retrigger_irq(unsigned int irq)
1527 struct irq_cfg *cfg = &irq_cfg[irq];
1528 unsigned long flags;
1530 spin_lock_irqsave(&vector_lock, flags);
1531 send_IPI_mask(cpumask_of_cpu(first_cpu(cfg->domain)), cfg->vector);
1532 spin_unlock_irqrestore(&vector_lock, flags);
1538 * Level and edge triggered IO-APIC interrupts need different handling,
1539 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1540 * handled with the level-triggered descriptor, but that one has slightly
1541 * more overhead. Level-triggered interrupts cannot be handled with the
1542 * edge-triggered handler, without risking IRQ storms and other ugly
1548 #ifdef CONFIG_INTR_REMAP
1549 static void ir_irq_migration(struct work_struct *work);
1551 static DECLARE_DELAYED_WORK(ir_migration_work, ir_irq_migration);
1554 * Migrate the IO-APIC irq in the presence of intr-remapping.
1556 * For edge triggered, irq migration is a simple atomic update(of vector
1557 * and cpu destination) of IRTE and flush the hardware cache.
1559 * For level triggered, we need to modify the io-apic RTE aswell with the update
1560 * vector information, along with modifying IRTE with vector and destination.
1561 * So irq migration for level triggered is little bit more complex compared to
1562 * edge triggered migration. But the good news is, we use the same algorithm
1563 * for level triggered migration as we have today, only difference being,
1564 * we now initiate the irq migration from process context instead of the
1565 * interrupt context.
1567 * In future, when we do a directed EOI (combined with cpu EOI broadcast
1568 * suppression) to the IO-APIC, level triggered irq migration will also be
1569 * as simple as edge triggered migration and we can do the irq migration
1570 * with a simple atomic update to IO-APIC RTE.
1572 static void migrate_ioapic_irq(int irq, cpumask_t mask)
1574 struct irq_cfg *cfg = irq_cfg + irq;
1575 struct irq_desc *desc = irq_desc + irq;
1576 cpumask_t tmp, cleanup_mask;
1578 int modify_ioapic_rte = desc->status & IRQ_LEVEL;
1580 unsigned long flags;
1582 cpus_and(tmp, mask, cpu_online_map);
1583 if (cpus_empty(tmp))
1586 if (get_irte(irq, &irte))
1589 if (assign_irq_vector(irq, mask))
1592 cpus_and(tmp, cfg->domain, mask);
1593 dest = cpu_mask_to_apicid(tmp);
1595 if (modify_ioapic_rte) {
1596 spin_lock_irqsave(&ioapic_lock, flags);
1597 __target_IO_APIC_irq(irq, dest, cfg->vector);
1598 spin_unlock_irqrestore(&ioapic_lock, flags);
1601 irte.vector = cfg->vector;
1602 irte.dest_id = IRTE_DEST(dest);
1605 * Modified the IRTE and flushes the Interrupt entry cache.
1607 modify_irte(irq, &irte);
1609 if (cfg->move_in_progress) {
1610 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
1611 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
1612 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
1613 cfg->move_in_progress = 0;
1616 irq_desc[irq].affinity = mask;
1619 static int migrate_irq_remapped_level(int irq)
1623 mask_IO_APIC_irq(irq);
1625 if (io_apic_level_ack_pending(irq)) {
1627 * Interrupt in progress. Migrating irq now will change the
1628 * vector information in the IO-APIC RTE and that will confuse
1629 * the EOI broadcast performed by cpu.
1630 * So, delay the irq migration to the next instance.
1632 schedule_delayed_work(&ir_migration_work, 1);
1636 /* everthing is clear. we have right of way */
1637 migrate_ioapic_irq(irq, irq_desc[irq].pending_mask);
1640 irq_desc[irq].status &= ~IRQ_MOVE_PENDING;
1641 cpus_clear(irq_desc[irq].pending_mask);
1644 unmask_IO_APIC_irq(irq);
1648 static void ir_irq_migration(struct work_struct *work)
1652 for (irq = 0; irq < NR_IRQS; irq++) {
1653 struct irq_desc *desc = irq_desc + irq;
1654 if (desc->status & IRQ_MOVE_PENDING) {
1655 unsigned long flags;
1657 spin_lock_irqsave(&desc->lock, flags);
1658 if (!desc->chip->set_affinity ||
1659 !(desc->status & IRQ_MOVE_PENDING)) {
1660 desc->status &= ~IRQ_MOVE_PENDING;
1661 spin_unlock_irqrestore(&desc->lock, flags);
1665 desc->chip->set_affinity(irq,
1666 irq_desc[irq].pending_mask);
1667 spin_unlock_irqrestore(&desc->lock, flags);
1673 * Migrates the IRQ destination in the process context.
1675 static void set_ir_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
1677 if (irq_desc[irq].status & IRQ_LEVEL) {
1678 irq_desc[irq].status |= IRQ_MOVE_PENDING;
1679 irq_desc[irq].pending_mask = mask;
1680 migrate_irq_remapped_level(irq);
1684 migrate_ioapic_irq(irq, mask);
1688 asmlinkage void smp_irq_move_cleanup_interrupt(void)
1690 unsigned vector, me;
1695 me = smp_processor_id();
1696 for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
1698 struct irq_desc *desc;
1699 struct irq_cfg *cfg;
1700 irq = __get_cpu_var(vector_irq)[vector];
1704 desc = irq_desc + irq;
1705 cfg = irq_cfg + irq;
1706 spin_lock(&desc->lock);
1707 if (!cfg->move_cleanup_count)
1710 if ((vector == cfg->vector) && cpu_isset(me, cfg->domain))
1713 __get_cpu_var(vector_irq)[vector] = -1;
1714 cfg->move_cleanup_count--;
1716 spin_unlock(&desc->lock);
1722 static void irq_complete_move(unsigned int irq)
1724 struct irq_cfg *cfg = irq_cfg + irq;
1725 unsigned vector, me;
1727 if (likely(!cfg->move_in_progress))
1730 vector = ~get_irq_regs()->orig_ax;
1731 me = smp_processor_id();
1732 if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) {
1733 cpumask_t cleanup_mask;
1735 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
1736 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
1737 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
1738 cfg->move_in_progress = 0;
1742 static inline void irq_complete_move(unsigned int irq) {}
1744 #ifdef CONFIG_INTR_REMAP
1745 static void ack_x2apic_level(unsigned int irq)
1750 static void ack_x2apic_edge(unsigned int irq)
1756 static void ack_apic_edge(unsigned int irq)
1758 irq_complete_move(irq);
1759 move_native_irq(irq);
1763 static void ack_apic_level(unsigned int irq)
1765 int do_unmask_irq = 0;
1767 irq_complete_move(irq);
1768 #ifdef CONFIG_GENERIC_PENDING_IRQ
1769 /* If we are moving the irq we need to mask it */
1770 if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
1772 mask_IO_APIC_irq(irq);
1777 * We must acknowledge the irq before we move it or the acknowledge will
1778 * not propagate properly.
1782 /* Now we can move and renable the irq */
1783 if (unlikely(do_unmask_irq)) {
1784 /* Only migrate the irq if the ack has been received.
1786 * On rare occasions the broadcast level triggered ack gets
1787 * delayed going to ioapics, and if we reprogram the
1788 * vector while Remote IRR is still set the irq will never
1791 * To prevent this scenario we read the Remote IRR bit
1792 * of the ioapic. This has two effects.
1793 * - On any sane system the read of the ioapic will
1794 * flush writes (and acks) going to the ioapic from
1796 * - We get to see if the ACK has actually been delivered.
1798 * Based on failed experiments of reprogramming the
1799 * ioapic entry from outside of irq context starting
1800 * with masking the ioapic entry and then polling until
1801 * Remote IRR was clear before reprogramming the
1802 * ioapic I don't trust the Remote IRR bit to be
1803 * completey accurate.
1805 * However there appears to be no other way to plug
1806 * this race, so if the Remote IRR bit is not
1807 * accurate and is causing problems then it is a hardware bug
1808 * and you can go talk to the chipset vendor about it.
1810 if (!io_apic_level_ack_pending(irq))
1811 move_masked_irq(irq);
1812 unmask_IO_APIC_irq(irq);
1816 static struct irq_chip ioapic_chip __read_mostly = {
1818 .startup = startup_ioapic_irq,
1819 .mask = mask_IO_APIC_irq,
1820 .unmask = unmask_IO_APIC_irq,
1821 .ack = ack_apic_edge,
1822 .eoi = ack_apic_level,
1824 .set_affinity = set_ioapic_affinity_irq,
1826 .retrigger = ioapic_retrigger_irq,
1829 #ifdef CONFIG_INTR_REMAP
1830 static struct irq_chip ir_ioapic_chip __read_mostly = {
1831 .name = "IR-IO-APIC",
1832 .startup = startup_ioapic_irq,
1833 .mask = mask_IO_APIC_irq,
1834 .unmask = unmask_IO_APIC_irq,
1835 .ack = ack_x2apic_edge,
1836 .eoi = ack_x2apic_level,
1838 .set_affinity = set_ir_ioapic_affinity_irq,
1840 .retrigger = ioapic_retrigger_irq,
1844 static inline void init_IO_APIC_traps(void)
1849 * NOTE! The local APIC isn't very good at handling
1850 * multiple interrupts at the same interrupt level.
1851 * As the interrupt level is determined by taking the
1852 * vector number and shifting that right by 4, we
1853 * want to spread these out a bit so that they don't
1854 * all fall in the same interrupt level.
1856 * Also, we've got to be careful not to trash gate
1857 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1859 for (irq = 0; irq < NR_IRQS ; irq++) {
1860 if (IO_APIC_IRQ(irq) && !irq_cfg[irq].vector) {
1862 * Hmm.. We don't have an entry for this,
1863 * so default to an old-fashioned 8259
1864 * interrupt if we can..
1867 make_8259A_irq(irq);
1869 /* Strange. Oh, well.. */
1870 irq_desc[irq].chip = &no_irq_chip;
1875 static void unmask_lapic_irq(unsigned int irq)
1879 v = apic_read(APIC_LVT0);
1880 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1883 static void mask_lapic_irq(unsigned int irq)
1887 v = apic_read(APIC_LVT0);
1888 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1891 static void ack_lapic_irq (unsigned int irq)
1896 static struct irq_chip lapic_chip __read_mostly = {
1897 .name = "local-APIC",
1898 .mask = mask_lapic_irq,
1899 .unmask = unmask_lapic_irq,
1900 .ack = ack_lapic_irq,
1903 static void lapic_register_intr(int irq)
1905 irq_desc[irq].status &= ~IRQ_LEVEL;
1906 set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
1910 static void __init setup_nmi(void)
1913 * Dirty trick to enable the NMI watchdog ...
1914 * We put the 8259A master into AEOI mode and
1915 * unmask on all local APICs LVT0 as NMI.
1917 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1918 * is from Maciej W. Rozycki - so we do not have to EOI from
1919 * the NMI handler or the timer interrupt.
1921 printk(KERN_INFO "activating NMI Watchdog ...");
1923 enable_NMI_through_LVT0();
1929 * This looks a bit hackish but it's about the only one way of sending
1930 * a few INTA cycles to 8259As and any associated glue logic. ICR does
1931 * not support the ExtINT mode, unfortunately. We need to send these
1932 * cycles as some i82489DX-based boards have glue logic that keeps the
1933 * 8259A interrupt line asserted until INTA. --macro
1935 static inline void __init unlock_ExtINT_logic(void)
1938 struct IO_APIC_route_entry entry0, entry1;
1939 unsigned char save_control, save_freq_select;
1941 pin = find_isa_irq_pin(8, mp_INT);
1942 apic = find_isa_irq_apic(8, mp_INT);
1946 entry0 = ioapic_read_entry(apic, pin);
1948 clear_IO_APIC_pin(apic, pin);
1950 memset(&entry1, 0, sizeof(entry1));
1952 entry1.dest_mode = 0; /* physical delivery */
1953 entry1.mask = 0; /* unmask IRQ now */
1954 entry1.dest = hard_smp_processor_id();
1955 entry1.delivery_mode = dest_ExtINT;
1956 entry1.polarity = entry0.polarity;
1960 ioapic_write_entry(apic, pin, entry1);
1962 save_control = CMOS_READ(RTC_CONTROL);
1963 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1964 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
1966 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
1971 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
1975 CMOS_WRITE(save_control, RTC_CONTROL);
1976 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1977 clear_IO_APIC_pin(apic, pin);
1979 ioapic_write_entry(apic, pin, entry0);
1983 * This code may look a bit paranoid, but it's supposed to cooperate with
1984 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
1985 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
1986 * fanatically on his truly buggy board.
1988 * FIXME: really need to revamp this for modern platforms only.
1990 static inline void __init check_timer(void)
1992 struct irq_cfg *cfg = irq_cfg + 0;
1993 int apic1, pin1, apic2, pin2;
1994 unsigned long flags;
1997 local_irq_save(flags);
2000 * get/set the timer IRQ vector:
2002 disable_8259A_irq(0);
2003 assign_irq_vector(0, TARGET_CPUS);
2006 * As IRQ0 is to be enabled in the 8259A, the virtual
2007 * wire has to be disabled in the local APIC.
2009 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2012 pin1 = find_isa_irq_pin(0, mp_INT);
2013 apic1 = find_isa_irq_apic(0, mp_INT);
2014 pin2 = ioapic_i8259.pin;
2015 apic2 = ioapic_i8259.apic;
2017 apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
2018 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2019 cfg->vector, apic1, pin1, apic2, pin2);
2022 * Some BIOS writers are clueless and report the ExtINTA
2023 * I/O APIC input from the cascaded 8259A as the timer
2024 * interrupt input. So just in case, if only one pin
2025 * was found above, try it both directly and through the
2029 if (intr_remapping_enabled)
2030 panic("BIOS bug: timer not connected to IO-APIC");
2034 } else if (pin2 == -1) {
2041 * Ok, does IRQ0 through the IOAPIC work?
2044 add_pin_to_irq(0, apic1, pin1);
2045 setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
2047 unmask_IO_APIC_irq(0);
2048 if (!no_timer_check && timer_irq_works()) {
2049 if (nmi_watchdog == NMI_IO_APIC) {
2051 enable_8259A_irq(0);
2053 if (disable_timer_pin_1 > 0)
2054 clear_IO_APIC_pin(0, pin1);
2057 if (intr_remapping_enabled)
2058 panic("timer doesn't work through Interrupt-remapped IO-APIC");
2059 clear_IO_APIC_pin(apic1, pin1);
2061 apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
2062 "8254 timer not connected to IO-APIC\n");
2064 apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
2065 "(IRQ0) through the 8259A ...\n");
2066 apic_printk(APIC_QUIET, KERN_INFO
2067 "..... (found apic %d pin %d) ...\n", apic2, pin2);
2069 * legacy devices should be connected to IO APIC #0
2071 replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
2072 setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
2073 unmask_IO_APIC_irq(0);
2074 enable_8259A_irq(0);
2075 if (timer_irq_works()) {
2076 apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
2077 timer_through_8259 = 1;
2078 if (nmi_watchdog == NMI_IO_APIC) {
2079 disable_8259A_irq(0);
2081 enable_8259A_irq(0);
2086 * Cleanup, just in case ...
2088 disable_8259A_irq(0);
2089 clear_IO_APIC_pin(apic2, pin2);
2090 apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
2093 if (nmi_watchdog == NMI_IO_APIC) {
2094 apic_printk(APIC_QUIET, KERN_WARNING "timer doesn't work "
2095 "through the IO-APIC - disabling NMI Watchdog!\n");
2096 nmi_watchdog = NMI_NONE;
2099 apic_printk(APIC_QUIET, KERN_INFO
2100 "...trying to set up timer as Virtual Wire IRQ...\n");
2102 lapic_register_intr(0);
2103 apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
2104 enable_8259A_irq(0);
2106 if (timer_irq_works()) {
2107 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2110 disable_8259A_irq(0);
2111 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
2112 apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
2114 apic_printk(APIC_QUIET, KERN_INFO
2115 "...trying to set up timer as ExtINT IRQ...\n");
2119 apic_write(APIC_LVT0, APIC_DM_EXTINT);
2121 unlock_ExtINT_logic();
2123 if (timer_irq_works()) {
2124 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2127 apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
2128 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
2129 "report. Then try booting with the 'noapic' option.\n");
2131 local_irq_restore(flags);
2134 static int __init notimercheck(char *s)
2139 __setup("no_timer_check", notimercheck);
2142 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
2143 * to devices. However there may be an I/O APIC pin available for
2144 * this interrupt regardless. The pin may be left unconnected, but
2145 * typically it will be reused as an ExtINT cascade interrupt for
2146 * the master 8259A. In the MPS case such a pin will normally be
2147 * reported as an ExtINT interrupt in the MP table. With ACPI
2148 * there is no provision for ExtINT interrupts, and in the absence
2149 * of an override it would be treated as an ordinary ISA I/O APIC
2150 * interrupt, that is edge-triggered and unmasked by default. We
2151 * used to do this, but it caused problems on some systems because
2152 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
2153 * the same ExtINT cascade interrupt to drive the local APIC of the
2154 * bootstrap processor. Therefore we refrain from routing IRQ2 to
2155 * the I/O APIC in all cases now. No actual device should request
2156 * it anyway. --macro
2158 #define PIC_IRQS (1<<2)
2160 void __init setup_IO_APIC(void)
2164 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
2167 io_apic_irqs = ~PIC_IRQS;
2169 apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
2172 setup_IO_APIC_irqs();
2173 init_IO_APIC_traps();
2179 struct sysfs_ioapic_data {
2180 struct sys_device dev;
2181 struct IO_APIC_route_entry entry[0];
2183 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
2185 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
2187 struct IO_APIC_route_entry *entry;
2188 struct sysfs_ioapic_data *data;
2191 data = container_of(dev, struct sysfs_ioapic_data, dev);
2192 entry = data->entry;
2193 for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
2194 *entry = ioapic_read_entry(dev->id, i);
2199 static int ioapic_resume(struct sys_device *dev)
2201 struct IO_APIC_route_entry *entry;
2202 struct sysfs_ioapic_data *data;
2203 unsigned long flags;
2204 union IO_APIC_reg_00 reg_00;
2207 data = container_of(dev, struct sysfs_ioapic_data, dev);
2208 entry = data->entry;
2210 spin_lock_irqsave(&ioapic_lock, flags);
2211 reg_00.raw = io_apic_read(dev->id, 0);
2212 if (reg_00.bits.ID != mp_ioapics[dev->id].mp_apicid) {
2213 reg_00.bits.ID = mp_ioapics[dev->id].mp_apicid;
2214 io_apic_write(dev->id, 0, reg_00.raw);
2216 spin_unlock_irqrestore(&ioapic_lock, flags);
2217 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
2218 ioapic_write_entry(dev->id, i, entry[i]);
2223 static struct sysdev_class ioapic_sysdev_class = {
2225 .suspend = ioapic_suspend,
2226 .resume = ioapic_resume,
2229 static int __init ioapic_init_sysfs(void)
2231 struct sys_device * dev;
2234 error = sysdev_class_register(&ioapic_sysdev_class);
2238 for (i = 0; i < nr_ioapics; i++ ) {
2239 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
2240 * sizeof(struct IO_APIC_route_entry);
2241 mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
2242 if (!mp_ioapic_data[i]) {
2243 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2246 dev = &mp_ioapic_data[i]->dev;
2248 dev->cls = &ioapic_sysdev_class;
2249 error = sysdev_register(dev);
2251 kfree(mp_ioapic_data[i]);
2252 mp_ioapic_data[i] = NULL;
2253 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2261 device_initcall(ioapic_init_sysfs);
2264 * Dynamic irq allocate and deallocation
2266 int create_irq(void)
2268 /* Allocate an unused irq */
2271 unsigned long flags;
2274 spin_lock_irqsave(&vector_lock, flags);
2275 for (new = (NR_IRQS - 1); new >= 0; new--) {
2276 if (platform_legacy_irq(new))
2278 if (irq_cfg[new].vector != 0)
2280 if (__assign_irq_vector(new, TARGET_CPUS) == 0)
2284 spin_unlock_irqrestore(&vector_lock, flags);
2287 dynamic_irq_init(irq);
2292 void destroy_irq(unsigned int irq)
2294 unsigned long flags;
2296 dynamic_irq_cleanup(irq);
2298 #ifdef CONFIG_INTR_REMAP
2301 spin_lock_irqsave(&vector_lock, flags);
2302 __clear_irq_vector(irq);
2303 spin_unlock_irqrestore(&vector_lock, flags);
2307 * MSI message composition
2309 #ifdef CONFIG_PCI_MSI
2310 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
2312 struct irq_cfg *cfg = irq_cfg + irq;
2318 err = assign_irq_vector(irq, tmp);
2322 cpus_and(tmp, cfg->domain, tmp);
2323 dest = cpu_mask_to_apicid(tmp);
2325 #ifdef CONFIG_INTR_REMAP
2326 if (irq_remapped(irq)) {
2331 ir_index = map_irq_to_irte_handle(irq, &sub_handle);
2332 BUG_ON(ir_index == -1);
2334 memset (&irte, 0, sizeof(irte));
2337 irte.dst_mode = INT_DEST_MODE;
2338 irte.trigger_mode = 0; /* edge */
2339 irte.dlvry_mode = INT_DELIVERY_MODE;
2340 irte.vector = cfg->vector;
2341 irte.dest_id = IRTE_DEST(dest);
2343 modify_irte(irq, &irte);
2345 msg->address_hi = MSI_ADDR_BASE_HI;
2346 msg->data = sub_handle;
2347 msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
2349 MSI_ADDR_IR_INDEX1(ir_index) |
2350 MSI_ADDR_IR_INDEX2(ir_index);
2354 msg->address_hi = MSI_ADDR_BASE_HI;
2357 ((INT_DEST_MODE == 0) ?
2358 MSI_ADDR_DEST_MODE_PHYSICAL:
2359 MSI_ADDR_DEST_MODE_LOGICAL) |
2360 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2361 MSI_ADDR_REDIRECTION_CPU:
2362 MSI_ADDR_REDIRECTION_LOWPRI) |
2363 MSI_ADDR_DEST_ID(dest);
2366 MSI_DATA_TRIGGER_EDGE |
2367 MSI_DATA_LEVEL_ASSERT |
2368 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2369 MSI_DATA_DELIVERY_FIXED:
2370 MSI_DATA_DELIVERY_LOWPRI) |
2371 MSI_DATA_VECTOR(cfg->vector);
2377 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
2379 struct irq_cfg *cfg = irq_cfg + irq;
2384 cpus_and(tmp, mask, cpu_online_map);
2385 if (cpus_empty(tmp))
2388 if (assign_irq_vector(irq, mask))
2391 cpus_and(tmp, cfg->domain, mask);
2392 dest = cpu_mask_to_apicid(tmp);
2394 read_msi_msg(irq, &msg);
2396 msg.data &= ~MSI_DATA_VECTOR_MASK;
2397 msg.data |= MSI_DATA_VECTOR(cfg->vector);
2398 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
2399 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
2401 write_msi_msg(irq, &msg);
2402 irq_desc[irq].affinity = mask;
2405 #ifdef CONFIG_INTR_REMAP
2407 * Migrate the MSI irq to another cpumask. This migration is
2408 * done in the process context using interrupt-remapping hardware.
2410 static void ir_set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
2412 struct irq_cfg *cfg = irq_cfg + irq;
2414 cpumask_t tmp, cleanup_mask;
2417 cpus_and(tmp, mask, cpu_online_map);
2418 if (cpus_empty(tmp))
2421 if (get_irte(irq, &irte))
2424 if (assign_irq_vector(irq, mask))
2427 cpus_and(tmp, cfg->domain, mask);
2428 dest = cpu_mask_to_apicid(tmp);
2430 irte.vector = cfg->vector;
2431 irte.dest_id = IRTE_DEST(dest);
2434 * atomically update the IRTE with the new destination and vector.
2436 modify_irte(irq, &irte);
2439 * After this point, all the interrupts will start arriving
2440 * at the new destination. So, time to cleanup the previous
2441 * vector allocation.
2443 if (cfg->move_in_progress) {
2444 cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
2445 cfg->move_cleanup_count = cpus_weight(cleanup_mask);
2446 send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
2447 cfg->move_in_progress = 0;
2450 irq_desc[irq].affinity = mask;
2453 #endif /* CONFIG_SMP */
2456 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
2457 * which implement the MSI or MSI-X Capability Structure.
2459 static struct irq_chip msi_chip = {
2461 .unmask = unmask_msi_irq,
2462 .mask = mask_msi_irq,
2463 .ack = ack_apic_edge,
2465 .set_affinity = set_msi_irq_affinity,
2467 .retrigger = ioapic_retrigger_irq,
2470 #ifdef CONFIG_INTR_REMAP
2471 static struct irq_chip msi_ir_chip = {
2472 .name = "IR-PCI-MSI",
2473 .unmask = unmask_msi_irq,
2474 .mask = mask_msi_irq,
2475 .ack = ack_x2apic_edge,
2477 .set_affinity = ir_set_msi_irq_affinity,
2479 .retrigger = ioapic_retrigger_irq,
2483 * Map the PCI dev to the corresponding remapping hardware unit
2484 * and allocate 'nvec' consecutive interrupt-remapping table entries
2487 static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
2489 struct intel_iommu *iommu;
2492 iommu = map_dev_to_ir(dev);
2495 "Unable to map PCI %s to iommu\n", pci_name(dev));
2499 index = alloc_irte(iommu, irq, nvec);
2502 "Unable to allocate %d IRTE for PCI %s\n", nvec,
2510 static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc, int irq)
2515 ret = msi_compose_msg(dev, irq, &msg);
2519 set_irq_msi(irq, desc);
2520 write_msi_msg(irq, &msg);
2522 #ifdef CONFIG_INTR_REMAP
2523 if (irq_remapped(irq)) {
2524 struct irq_desc *desc = irq_desc + irq;
2526 * irq migration in process context
2528 desc->status |= IRQ_MOVE_PCNTXT;
2529 set_irq_chip_and_handler_name(irq, &msi_ir_chip, handle_edge_irq, "edge");
2532 set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
2537 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
2545 #ifdef CONFIG_INTR_REMAP
2546 if (!intr_remapping_enabled)
2549 ret = msi_alloc_irte(dev, irq, 1);
2554 ret = setup_msi_irq(dev, desc, irq);
2561 #ifdef CONFIG_INTR_REMAP
2568 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
2570 int irq, ret, sub_handle;
2571 struct msi_desc *desc;
2572 #ifdef CONFIG_INTR_REMAP
2573 struct intel_iommu *iommu = 0;
2578 list_for_each_entry(desc, &dev->msi_list, list) {
2582 #ifdef CONFIG_INTR_REMAP
2583 if (!intr_remapping_enabled)
2588 * allocate the consecutive block of IRTE's
2591 index = msi_alloc_irte(dev, irq, nvec);
2597 iommu = map_dev_to_ir(dev);
2603 * setup the mapping between the irq and the IRTE
2604 * base index, the sub_handle pointing to the
2605 * appropriate interrupt remap table entry.
2607 set_irte_irq(irq, iommu, index, sub_handle);
2611 ret = setup_msi_irq(dev, desc, irq);
2623 void arch_teardown_msi_irq(unsigned int irq)
2630 static void dmar_msi_set_affinity(unsigned int irq, cpumask_t mask)
2632 struct irq_cfg *cfg = irq_cfg + irq;
2637 cpus_and(tmp, mask, cpu_online_map);
2638 if (cpus_empty(tmp))
2641 if (assign_irq_vector(irq, mask))
2644 cpus_and(tmp, cfg->domain, mask);
2645 dest = cpu_mask_to_apicid(tmp);
2647 dmar_msi_read(irq, &msg);
2649 msg.data &= ~MSI_DATA_VECTOR_MASK;
2650 msg.data |= MSI_DATA_VECTOR(cfg->vector);
2651 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
2652 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
2654 dmar_msi_write(irq, &msg);
2655 irq_desc[irq].affinity = mask;
2657 #endif /* CONFIG_SMP */
2659 struct irq_chip dmar_msi_type = {
2661 .unmask = dmar_msi_unmask,
2662 .mask = dmar_msi_mask,
2663 .ack = ack_apic_edge,
2665 .set_affinity = dmar_msi_set_affinity,
2667 .retrigger = ioapic_retrigger_irq,
2670 int arch_setup_dmar_msi(unsigned int irq)
2675 ret = msi_compose_msg(NULL, irq, &msg);
2678 dmar_msi_write(irq, &msg);
2679 set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
2685 #endif /* CONFIG_PCI_MSI */
2687 * Hypertransport interrupt support
2689 #ifdef CONFIG_HT_IRQ
2693 static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
2695 struct ht_irq_msg msg;
2696 fetch_ht_irq_msg(irq, &msg);
2698 msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
2699 msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
2701 msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
2702 msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
2704 write_ht_irq_msg(irq, &msg);
2707 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2709 struct irq_cfg *cfg = irq_cfg + irq;
2713 cpus_and(tmp, mask, cpu_online_map);
2714 if (cpus_empty(tmp))
2717 if (assign_irq_vector(irq, mask))
2720 cpus_and(tmp, cfg->domain, mask);
2721 dest = cpu_mask_to_apicid(tmp);
2723 target_ht_irq(irq, dest, cfg->vector);
2724 irq_desc[irq].affinity = mask;
2728 static struct irq_chip ht_irq_chip = {
2730 .mask = mask_ht_irq,
2731 .unmask = unmask_ht_irq,
2732 .ack = ack_apic_edge,
2734 .set_affinity = set_ht_irq_affinity,
2736 .retrigger = ioapic_retrigger_irq,
2739 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2741 struct irq_cfg *cfg = irq_cfg + irq;
2746 err = assign_irq_vector(irq, tmp);
2748 struct ht_irq_msg msg;
2751 cpus_and(tmp, cfg->domain, tmp);
2752 dest = cpu_mask_to_apicid(tmp);
2754 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
2758 HT_IRQ_LOW_DEST_ID(dest) |
2759 HT_IRQ_LOW_VECTOR(cfg->vector) |
2760 ((INT_DEST_MODE == 0) ?
2761 HT_IRQ_LOW_DM_PHYSICAL :
2762 HT_IRQ_LOW_DM_LOGICAL) |
2763 HT_IRQ_LOW_RQEOI_EDGE |
2764 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2765 HT_IRQ_LOW_MT_FIXED :
2766 HT_IRQ_LOW_MT_ARBITRATED) |
2767 HT_IRQ_LOW_IRQ_MASKED;
2769 write_ht_irq_msg(irq, &msg);
2771 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2772 handle_edge_irq, "edge");
2776 #endif /* CONFIG_HT_IRQ */
2778 /* --------------------------------------------------------------------------
2779 ACPI-based IOAPIC Configuration
2780 -------------------------------------------------------------------------- */
2784 #define IO_APIC_MAX_ID 0xFE
2786 int __init io_apic_get_redir_entries (int ioapic)
2788 union IO_APIC_reg_01 reg_01;
2789 unsigned long flags;
2791 spin_lock_irqsave(&ioapic_lock, flags);
2792 reg_01.raw = io_apic_read(ioapic, 1);
2793 spin_unlock_irqrestore(&ioapic_lock, flags);
2795 return reg_01.bits.entries;
2799 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
2801 if (!IO_APIC_IRQ(irq)) {
2802 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2808 * IRQs < 16 are already in the irq_2_pin[] map
2811 add_pin_to_irq(irq, ioapic, pin);
2813 setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
2819 int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
2823 if (skip_ioapic_setup)
2826 for (i = 0; i < mp_irq_entries; i++)
2827 if (mp_irqs[i].mp_irqtype == mp_INT &&
2828 mp_irqs[i].mp_srcbusirq == bus_irq)
2830 if (i >= mp_irq_entries)
2833 *trigger = irq_trigger(i);
2834 *polarity = irq_polarity(i);
2838 #endif /* CONFIG_ACPI */
2841 * This function currently is only a helper for the i386 smp boot process where
2842 * we need to reprogram the ioredtbls to cater for the cpus which have come online
2843 * so mask in all cases should simply be TARGET_CPUS
2846 void __init setup_ioapic_dest(void)
2848 int pin, ioapic, irq, irq_entry;
2850 if (skip_ioapic_setup == 1)
2853 for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
2854 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
2855 irq_entry = find_irq_entry(ioapic, pin, mp_INT);
2856 if (irq_entry == -1)
2858 irq = pin_2_irq(irq_entry, ioapic, pin);
2860 /* setup_IO_APIC_irqs could fail to get vector for some device
2861 * when you have too many devices, because at that time only boot
2864 if (!irq_cfg[irq].vector)
2865 setup_IO_APIC_irq(ioapic, pin, irq,
2866 irq_trigger(irq_entry),
2867 irq_polarity(irq_entry));
2868 #ifdef CONFIG_INTR_REMAP
2869 else if (intr_remapping_enabled)
2870 set_ir_ioapic_affinity_irq(irq, TARGET_CPUS);
2873 set_ioapic_affinity_irq(irq, TARGET_CPUS);
2880 #define IOAPIC_RESOURCE_NAME_SIZE 11
2882 static struct resource *ioapic_resources;
2884 static struct resource * __init ioapic_setup_resources(void)
2887 struct resource *res;
2891 if (nr_ioapics <= 0)
2894 n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
2897 mem = alloc_bootmem(n);
2901 mem += sizeof(struct resource) * nr_ioapics;
2903 for (i = 0; i < nr_ioapics; i++) {
2905 res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
2906 sprintf(mem, "IOAPIC %u", i);
2907 mem += IOAPIC_RESOURCE_NAME_SIZE;
2911 ioapic_resources = res;
2916 void __init ioapic_init_mappings(void)
2918 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
2919 struct resource *ioapic_res;
2922 ioapic_res = ioapic_setup_resources();
2923 for (i = 0; i < nr_ioapics; i++) {
2924 if (smp_found_config) {
2925 ioapic_phys = mp_ioapics[i].mp_apicaddr;
2927 ioapic_phys = (unsigned long)
2928 alloc_bootmem_pages(PAGE_SIZE);
2929 ioapic_phys = __pa(ioapic_phys);
2931 set_fixmap_nocache(idx, ioapic_phys);
2932 apic_printk(APIC_VERBOSE,
2933 "mapped IOAPIC to %016lx (%016lx)\n",
2934 __fix_to_virt(idx), ioapic_phys);
2937 if (ioapic_res != NULL) {
2938 ioapic_res->start = ioapic_phys;
2939 ioapic_res->end = ioapic_phys + (4 * 1024) - 1;
2945 static int __init ioapic_insert_resources(void)
2948 struct resource *r = ioapic_resources;
2952 "IO APIC resources could be not be allocated.\n");
2956 for (i = 0; i < nr_ioapics; i++) {
2957 insert_resource(&iomem_resource, r);
2964 /* Insert the IO APIC resources after PCI initialization has occured to handle
2965 * IO APICS that are mapped in on a BAR in PCI space. */
2966 late_initcall(ioapic_insert_resources);