2 * Intel IO-APIC support for multi-Pentium hosts.
4 * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
6 * Many thanks to Stig Venaas for trying out countless experimental
7 * patches and reporting/debugging problems patiently!
9 * (c) 1999, Multiple IO-APIC support, developed by
10 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
11 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
12 * further tested and cleaned up by Zach Brown <zab@redhat.com>
13 * and Ingo Molnar <mingo@redhat.com>
16 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
17 * thanks to Eric Gilmore
19 * for testing these extensively
20 * Paul Diefenbaugh : Added full ACPI support
22 * Historical information which is worth to be preserved:
26 * We used to have a workaround for a bug in SiS chips which
27 * required to rewrite the index register for a read-modify-write
28 * operation as the chip lost the index information which was
29 * setup for the read already. We cache the data now, so that
30 * workaround has been removed.
34 #include <linux/interrupt.h>
35 #include <linux/init.h>
36 #include <linux/delay.h>
37 #include <linux/sched.h>
38 #include <linux/pci.h>
39 #include <linux/mc146818rtc.h>
40 #include <linux/compiler.h>
41 #include <linux/acpi.h>
42 #include <linux/module.h>
43 #include <linux/syscore_ops.h>
44 #include <linux/freezer.h>
45 #include <linux/kthread.h>
46 #include <linux/jiffies.h> /* time_after() */
47 #include <linux/slab.h>
48 #include <linux/bootmem.h>
50 #include <asm/irqdomain.h>
56 #include <asm/proto.h>
59 #include <asm/timer.h>
60 #include <asm/i8259.h>
61 #include <asm/setup.h>
62 #include <asm/irq_remapping.h>
63 #include <asm/hw_irq.h>
67 #define for_each_ioapic(idx) \
68 for ((idx) = 0; (idx) < nr_ioapics; (idx)++)
69 #define for_each_ioapic_reverse(idx) \
70 for ((idx) = nr_ioapics - 1; (idx) >= 0; (idx)--)
71 #define for_each_pin(idx, pin) \
72 for ((pin) = 0; (pin) < ioapics[(idx)].nr_registers; (pin)++)
73 #define for_each_ioapic_pin(idx, pin) \
74 for_each_ioapic((idx)) \
75 for_each_pin((idx), (pin))
76 #define for_each_irq_pin(entry, head) \
77 list_for_each_entry(entry, &head, list)
79 static DEFINE_RAW_SPINLOCK(ioapic_lock);
80 static DEFINE_MUTEX(ioapic_mutex);
81 static unsigned int ioapic_dynirq_base;
82 static int ioapic_initialized;
85 struct list_head list;
90 struct list_head irq_2_pin;
91 struct IO_APIC_route_entry entry;
98 struct mp_ioapic_gsi {
103 static struct ioapic {
105 * # of IRQ routing registers
109 * Saved state during suspend/resume, or while enabling intr-remap.
111 struct IO_APIC_route_entry *saved_registers;
112 /* I/O APIC config */
113 struct mpc_ioapic mp_config;
114 /* IO APIC gsi routing info */
115 struct mp_ioapic_gsi gsi_config;
116 struct ioapic_domain_cfg irqdomain_cfg;
117 struct irq_domain *irqdomain;
118 struct resource *iomem_res;
119 } ioapics[MAX_IO_APICS];
121 #define mpc_ioapic_ver(ioapic_idx) ioapics[ioapic_idx].mp_config.apicver
123 int mpc_ioapic_id(int ioapic_idx)
125 return ioapics[ioapic_idx].mp_config.apicid;
128 unsigned int mpc_ioapic_addr(int ioapic_idx)
130 return ioapics[ioapic_idx].mp_config.apicaddr;
133 static inline struct mp_ioapic_gsi *mp_ioapic_gsi_routing(int ioapic_idx)
135 return &ioapics[ioapic_idx].gsi_config;
138 static inline int mp_ioapic_pin_count(int ioapic)
140 struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
142 return gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
145 static inline u32 mp_pin_to_gsi(int ioapic, int pin)
147 return mp_ioapic_gsi_routing(ioapic)->gsi_base + pin;
150 static inline bool mp_is_legacy_irq(int irq)
152 return irq >= 0 && irq < nr_legacy_irqs();
156 * Initialize all legacy IRQs and all pins on the first IOAPIC
157 * if we have legacy interrupt controller. Kernel boot option "pirq="
158 * may rely on non-legacy pins on the first IOAPIC.
160 static inline int mp_init_irq_at_boot(int ioapic, int irq)
162 if (!nr_legacy_irqs())
165 return ioapic == 0 || mp_is_legacy_irq(irq);
168 static inline struct irq_domain *mp_ioapic_irqdomain(int ioapic)
170 return ioapics[ioapic].irqdomain;
175 /* The one past the highest gsi number used */
178 /* MP IRQ source entries */
179 struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
181 /* # of MP IRQ source entries */
185 int mp_bus_id_to_type[MAX_MP_BUSSES];
188 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
190 int skip_ioapic_setup;
193 * disable_ioapic_support() - disables ioapic support at runtime
195 void disable_ioapic_support(void)
199 noioapicreroute = -1;
201 skip_ioapic_setup = 1;
204 static int __init parse_noapic(char *str)
206 /* disable IO-APIC */
207 disable_ioapic_support();
210 early_param("noapic", parse_noapic);
212 /* Will be called in mpparse/acpi/sfi codes for saving IRQ info */
213 void mp_save_irq(struct mpc_intsrc *m)
217 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
218 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
219 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
220 m->srcbusirq, m->dstapic, m->dstirq);
222 for (i = 0; i < mp_irq_entries; i++) {
223 if (!memcmp(&mp_irqs[i], m, sizeof(*m)))
227 memcpy(&mp_irqs[mp_irq_entries], m, sizeof(*m));
228 if (++mp_irq_entries == MAX_IRQ_SOURCES)
229 panic("Max # of irq sources exceeded!!\n");
232 static void alloc_ioapic_saved_registers(int idx)
236 if (ioapics[idx].saved_registers)
239 size = sizeof(struct IO_APIC_route_entry) * ioapics[idx].nr_registers;
240 ioapics[idx].saved_registers = kzalloc(size, GFP_KERNEL);
241 if (!ioapics[idx].saved_registers)
242 pr_err("IOAPIC %d: suspend/resume impossible!\n", idx);
245 static void free_ioapic_saved_registers(int idx)
247 kfree(ioapics[idx].saved_registers);
248 ioapics[idx].saved_registers = NULL;
251 int __init arch_early_ioapic_init(void)
255 if (!nr_legacy_irqs())
259 alloc_ioapic_saved_registers(i);
266 unsigned int unused[3];
268 unsigned int unused2[11];
272 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
274 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
275 + (mpc_ioapic_addr(idx) & ~PAGE_MASK);
278 static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
280 struct io_apic __iomem *io_apic = io_apic_base(apic);
281 writel(vector, &io_apic->eoi);
284 unsigned int native_io_apic_read(unsigned int apic, unsigned int reg)
286 struct io_apic __iomem *io_apic = io_apic_base(apic);
287 writel(reg, &io_apic->index);
288 return readl(&io_apic->data);
291 static void io_apic_write(unsigned int apic, unsigned int reg,
294 struct io_apic __iomem *io_apic = io_apic_base(apic);
296 writel(reg, &io_apic->index);
297 writel(value, &io_apic->data);
301 struct { u32 w1, w2; };
302 struct IO_APIC_route_entry entry;
305 static struct IO_APIC_route_entry __ioapic_read_entry(int apic, int pin)
307 union entry_union eu;
309 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
310 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
315 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
317 union entry_union eu;
320 raw_spin_lock_irqsave(&ioapic_lock, flags);
321 eu.entry = __ioapic_read_entry(apic, pin);
322 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
328 * When we write a new IO APIC routing entry, we need to write the high
329 * word first! If the mask bit in the low word is clear, we will enable
330 * the interrupt, and we need to make sure the entry is fully populated
331 * before that happens.
333 static void __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
335 union entry_union eu = {{0, 0}};
338 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
339 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
342 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
346 raw_spin_lock_irqsave(&ioapic_lock, flags);
347 __ioapic_write_entry(apic, pin, e);
348 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
352 * When we mask an IO APIC routing entry, we need to write the low
353 * word first, in order to set the mask bit before we change the
356 static void ioapic_mask_entry(int apic, int pin)
359 union entry_union eu = { .entry.mask = IOAPIC_MASKED };
361 raw_spin_lock_irqsave(&ioapic_lock, flags);
362 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
363 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
364 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
368 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
369 * shared ISA-space IRQs, so we have to support them. We are super
370 * fast in the common case, and fast for shared ISA-space IRQs.
372 static int __add_pin_to_irq_node(struct mp_chip_data *data,
373 int node, int apic, int pin)
375 struct irq_pin_list *entry;
377 /* don't allow duplicates */
378 for_each_irq_pin(entry, data->irq_2_pin)
379 if (entry->apic == apic && entry->pin == pin)
382 entry = kzalloc_node(sizeof(struct irq_pin_list), GFP_ATOMIC, node);
384 pr_err("can not alloc irq_pin_list (%d,%d,%d)\n",
390 list_add_tail(&entry->list, &data->irq_2_pin);
395 static void __remove_pin_from_irq(struct mp_chip_data *data, int apic, int pin)
397 struct irq_pin_list *tmp, *entry;
399 list_for_each_entry_safe(entry, tmp, &data->irq_2_pin, list)
400 if (entry->apic == apic && entry->pin == pin) {
401 list_del(&entry->list);
407 static void add_pin_to_irq_node(struct mp_chip_data *data,
408 int node, int apic, int pin)
410 if (__add_pin_to_irq_node(data, node, apic, pin))
411 panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
415 * Reroute an IRQ to a different pin.
417 static void __init replace_pin_at_irq_node(struct mp_chip_data *data, int node,
418 int oldapic, int oldpin,
419 int newapic, int newpin)
421 struct irq_pin_list *entry;
423 for_each_irq_pin(entry, data->irq_2_pin) {
424 if (entry->apic == oldapic && entry->pin == oldpin) {
425 entry->apic = newapic;
427 /* every one is different, right? */
432 /* old apic/pin didn't exist, so just add new ones */
433 add_pin_to_irq_node(data, node, newapic, newpin);
436 static void io_apic_modify_irq(struct mp_chip_data *data,
437 int mask_and, int mask_or,
438 void (*final)(struct irq_pin_list *entry))
440 union entry_union eu;
441 struct irq_pin_list *entry;
443 eu.entry = data->entry;
446 data->entry = eu.entry;
448 for_each_irq_pin(entry, data->irq_2_pin) {
449 io_apic_write(entry->apic, 0x10 + 2 * entry->pin, eu.w1);
455 static void io_apic_sync(struct irq_pin_list *entry)
458 * Synchronize the IO-APIC and the CPU by doing
459 * a dummy read from the IO-APIC
461 struct io_apic __iomem *io_apic;
463 io_apic = io_apic_base(entry->apic);
464 readl(&io_apic->data);
467 static void mask_ioapic_irq(struct irq_data *irq_data)
469 struct mp_chip_data *data = irq_data->chip_data;
472 raw_spin_lock_irqsave(&ioapic_lock, flags);
473 io_apic_modify_irq(data, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
474 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
477 static void __unmask_ioapic(struct mp_chip_data *data)
479 io_apic_modify_irq(data, ~IO_APIC_REDIR_MASKED, 0, NULL);
482 static void unmask_ioapic_irq(struct irq_data *irq_data)
484 struct mp_chip_data *data = irq_data->chip_data;
487 raw_spin_lock_irqsave(&ioapic_lock, flags);
488 __unmask_ioapic(data);
489 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
493 * IO-APIC versions below 0x20 don't support EOI register.
494 * For the record, here is the information about various versions:
496 * 1Xh I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
497 * 2Xh I/O(x)APIC which is PCI 2.2 Compliant
500 * Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
501 * version as 0x2. This is an error with documentation and these ICH chips
502 * use io-apic's of version 0x20.
504 * For IO-APIC's with EOI register, we use that to do an explicit EOI.
505 * Otherwise, we simulate the EOI message manually by changing the trigger
506 * mode to edge and then back to level, with RTE being masked during this.
508 static void __eoi_ioapic_pin(int apic, int pin, int vector)
510 if (mpc_ioapic_ver(apic) >= 0x20) {
511 io_apic_eoi(apic, vector);
513 struct IO_APIC_route_entry entry, entry1;
515 entry = entry1 = __ioapic_read_entry(apic, pin);
518 * Mask the entry and change the trigger mode to edge.
520 entry1.mask = IOAPIC_MASKED;
521 entry1.trigger = IOAPIC_EDGE;
523 __ioapic_write_entry(apic, pin, entry1);
526 * Restore the previous level triggered entry.
528 __ioapic_write_entry(apic, pin, entry);
532 static void eoi_ioapic_pin(int vector, struct mp_chip_data *data)
535 struct irq_pin_list *entry;
537 raw_spin_lock_irqsave(&ioapic_lock, flags);
538 for_each_irq_pin(entry, data->irq_2_pin)
539 __eoi_ioapic_pin(entry->apic, entry->pin, vector);
540 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
543 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
545 struct IO_APIC_route_entry entry;
547 /* Check delivery_mode to be sure we're not clearing an SMI pin */
548 entry = ioapic_read_entry(apic, pin);
549 if (entry.delivery_mode == dest_SMI)
553 * Make sure the entry is masked and re-read the contents to check
554 * if it is a level triggered pin and if the remote-IRR is set.
556 if (entry.mask == IOAPIC_UNMASKED) {
557 entry.mask = IOAPIC_MASKED;
558 ioapic_write_entry(apic, pin, entry);
559 entry = ioapic_read_entry(apic, pin);
566 * Make sure the trigger mode is set to level. Explicit EOI
567 * doesn't clear the remote-IRR if the trigger mode is not
570 if (entry.trigger == IOAPIC_EDGE) {
571 entry.trigger = IOAPIC_LEVEL;
572 ioapic_write_entry(apic, pin, entry);
574 raw_spin_lock_irqsave(&ioapic_lock, flags);
575 __eoi_ioapic_pin(apic, pin, entry.vector);
576 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
580 * Clear the rest of the bits in the IO-APIC RTE except for the mask
583 ioapic_mask_entry(apic, pin);
584 entry = ioapic_read_entry(apic, pin);
586 pr_err("Unable to reset IRR for apic: %d, pin :%d\n",
587 mpc_ioapic_id(apic), pin);
590 static void clear_IO_APIC (void)
594 for_each_ioapic_pin(apic, pin)
595 clear_IO_APIC_pin(apic, pin);
600 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
601 * specific CPU-side IRQs.
605 static int pirq_entries[MAX_PIRQS] = {
606 [0 ... MAX_PIRQS - 1] = -1
609 static int __init ioapic_pirq_setup(char *str)
612 int ints[MAX_PIRQS+1];
614 get_options(str, ARRAY_SIZE(ints), ints);
616 apic_printk(APIC_VERBOSE, KERN_INFO
617 "PIRQ redirection, working around broken MP-BIOS.\n");
619 if (ints[0] < MAX_PIRQS)
622 for (i = 0; i < max; i++) {
623 apic_printk(APIC_VERBOSE, KERN_DEBUG
624 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
626 * PIRQs are mapped upside down, usually.
628 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
633 __setup("pirq=", ioapic_pirq_setup);
634 #endif /* CONFIG_X86_32 */
637 * Saves all the IO-APIC RTE's
639 int save_ioapic_entries(void)
644 for_each_ioapic(apic) {
645 if (!ioapics[apic].saved_registers) {
650 for_each_pin(apic, pin)
651 ioapics[apic].saved_registers[pin] =
652 ioapic_read_entry(apic, pin);
659 * Mask all IO APIC entries.
661 void mask_ioapic_entries(void)
665 for_each_ioapic(apic) {
666 if (!ioapics[apic].saved_registers)
669 for_each_pin(apic, pin) {
670 struct IO_APIC_route_entry entry;
672 entry = ioapics[apic].saved_registers[pin];
673 if (entry.mask == IOAPIC_UNMASKED) {
674 entry.mask = IOAPIC_MASKED;
675 ioapic_write_entry(apic, pin, entry);
682 * Restore IO APIC entries which was saved in the ioapic structure.
684 int restore_ioapic_entries(void)
688 for_each_ioapic(apic) {
689 if (!ioapics[apic].saved_registers)
692 for_each_pin(apic, pin)
693 ioapic_write_entry(apic, pin,
694 ioapics[apic].saved_registers[pin]);
700 * Find the IRQ entry number of a certain pin.
702 static int find_irq_entry(int ioapic_idx, int pin, int type)
706 for (i = 0; i < mp_irq_entries; i++)
707 if (mp_irqs[i].irqtype == type &&
708 (mp_irqs[i].dstapic == mpc_ioapic_id(ioapic_idx) ||
709 mp_irqs[i].dstapic == MP_APIC_ALL) &&
710 mp_irqs[i].dstirq == pin)
717 * Find the pin to which IRQ[irq] (ISA) is connected
719 static int __init find_isa_irq_pin(int irq, int type)
723 for (i = 0; i < mp_irq_entries; i++) {
724 int lbus = mp_irqs[i].srcbus;
726 if (test_bit(lbus, mp_bus_not_pci) &&
727 (mp_irqs[i].irqtype == type) &&
728 (mp_irqs[i].srcbusirq == irq))
730 return mp_irqs[i].dstirq;
735 static int __init find_isa_irq_apic(int irq, int type)
739 for (i = 0; i < mp_irq_entries; i++) {
740 int lbus = mp_irqs[i].srcbus;
742 if (test_bit(lbus, mp_bus_not_pci) &&
743 (mp_irqs[i].irqtype == type) &&
744 (mp_irqs[i].srcbusirq == irq))
748 if (i < mp_irq_entries) {
751 for_each_ioapic(ioapic_idx)
752 if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic)
761 * EISA Edge/Level control register, ELCR
763 static int EISA_ELCR(unsigned int irq)
765 if (irq < nr_legacy_irqs()) {
766 unsigned int port = 0x4d0 + (irq >> 3);
767 return (inb(port) >> (irq & 7)) & 1;
769 apic_printk(APIC_VERBOSE, KERN_INFO
770 "Broken MPtable reports ISA irq %d\n", irq);
776 /* ISA interrupts are always active high edge triggered,
777 * when listed as conforming in the MP table. */
779 #define default_ISA_trigger(idx) (IOAPIC_EDGE)
780 #define default_ISA_polarity(idx) (IOAPIC_POL_HIGH)
782 /* EISA interrupts are always polarity zero and can be edge or level
783 * trigger depending on the ELCR value. If an interrupt is listed as
784 * EISA conforming in the MP table, that means its trigger type must
785 * be read in from the ELCR */
787 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
788 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
790 /* PCI interrupts are always active low level triggered,
791 * when listed as conforming in the MP table. */
793 #define default_PCI_trigger(idx) (IOAPIC_LEVEL)
794 #define default_PCI_polarity(idx) (IOAPIC_POL_LOW)
796 static int irq_polarity(int idx)
798 int bus = mp_irqs[idx].srcbus;
801 * Determine IRQ line polarity (high active or low active):
803 switch (mp_irqs[idx].irqflag & 0x03) {
805 /* conforms to spec, ie. bus-type dependent polarity */
806 if (test_bit(bus, mp_bus_not_pci))
807 return default_ISA_polarity(idx);
809 return default_PCI_polarity(idx);
811 return IOAPIC_POL_HIGH;
813 pr_warn("IOAPIC: Invalid polarity: 2, defaulting to low\n");
815 default: /* Pointless default required due to do gcc stupidity */
816 return IOAPIC_POL_LOW;
821 static int eisa_irq_trigger(int idx, int bus, int trigger)
823 switch (mp_bus_id_to_type[bus]) {
828 return default_EISA_trigger(idx);
830 pr_warn("IOAPIC: Invalid srcbus: %d defaulting to level\n", bus);
834 static inline int eisa_irq_trigger(int idx, int bus, int trigger)
840 static int irq_trigger(int idx)
842 int bus = mp_irqs[idx].srcbus;
846 * Determine IRQ trigger mode (edge or level sensitive):
848 switch ((mp_irqs[idx].irqflag >> 2) & 0x03) {
850 /* conforms to spec, ie. bus-type dependent trigger mode */
851 if (test_bit(bus, mp_bus_not_pci))
852 trigger = default_ISA_trigger(idx);
854 trigger = default_PCI_trigger(idx);
855 /* Take EISA into account */
856 return eisa_irq_trigger(idx, bus, trigger);
860 pr_warn("IOAPIC: Invalid trigger mode 2 defaulting to level\n");
862 default: /* Pointless default required due to do gcc stupidity */
867 void ioapic_set_alloc_attr(struct irq_alloc_info *info, int node,
868 int trigger, int polarity)
870 init_irq_alloc_info(info, NULL);
871 info->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
872 info->ioapic_node = node;
873 info->ioapic_trigger = trigger;
874 info->ioapic_polarity = polarity;
875 info->ioapic_valid = 1;
879 int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
882 static void ioapic_copy_alloc_attr(struct irq_alloc_info *dst,
883 struct irq_alloc_info *src,
884 u32 gsi, int ioapic_idx, int pin)
886 int trigger, polarity;
888 copy_irq_alloc_info(dst, src);
889 dst->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
890 dst->ioapic_id = mpc_ioapic_id(ioapic_idx);
891 dst->ioapic_pin = pin;
892 dst->ioapic_valid = 1;
893 if (src && src->ioapic_valid) {
894 dst->ioapic_node = src->ioapic_node;
895 dst->ioapic_trigger = src->ioapic_trigger;
896 dst->ioapic_polarity = src->ioapic_polarity;
898 dst->ioapic_node = NUMA_NO_NODE;
899 if (acpi_get_override_irq(gsi, &trigger, &polarity) >= 0) {
900 dst->ioapic_trigger = trigger;
901 dst->ioapic_polarity = polarity;
904 * PCI interrupts are always active low level
907 dst->ioapic_trigger = IOAPIC_LEVEL;
908 dst->ioapic_polarity = IOAPIC_POL_LOW;
913 static int ioapic_alloc_attr_node(struct irq_alloc_info *info)
915 return (info && info->ioapic_valid) ? info->ioapic_node : NUMA_NO_NODE;
918 static void mp_register_handler(unsigned int irq, unsigned long trigger)
920 irq_flow_handler_t hdl;
924 irq_set_status_flags(irq, IRQ_LEVEL);
927 irq_clear_status_flags(irq, IRQ_LEVEL);
931 hdl = fasteoi ? handle_fasteoi_irq : handle_edge_irq;
932 __irq_set_handler(irq, hdl, 0, fasteoi ? "fasteoi" : "edge");
935 static bool mp_check_pin_attr(int irq, struct irq_alloc_info *info)
937 struct mp_chip_data *data = irq_get_chip_data(irq);
940 * setup_IO_APIC_irqs() programs all legacy IRQs with default trigger
941 * and polarity attirbutes. So allow the first user to reprogram the
942 * pin with real trigger and polarity attributes.
944 if (irq < nr_legacy_irqs() && data->count == 1) {
945 if (info->ioapic_trigger != data->trigger)
946 mp_register_handler(irq, info->ioapic_trigger);
947 data->entry.trigger = data->trigger = info->ioapic_trigger;
948 data->entry.polarity = data->polarity = info->ioapic_polarity;
951 return data->trigger == info->ioapic_trigger &&
952 data->polarity == info->ioapic_polarity;
955 static int alloc_irq_from_domain(struct irq_domain *domain, int ioapic, u32 gsi,
956 struct irq_alloc_info *info)
960 int type = ioapics[ioapic].irqdomain_cfg.type;
963 case IOAPIC_DOMAIN_LEGACY:
965 * Dynamically allocate IRQ number for non-ISA IRQs in the first
966 * 16 GSIs on some weird platforms.
968 if (!ioapic_initialized || gsi >= nr_legacy_irqs())
970 legacy = mp_is_legacy_irq(irq);
972 case IOAPIC_DOMAIN_STRICT:
975 case IOAPIC_DOMAIN_DYNAMIC:
978 WARN(1, "ioapic: unknown irqdomain type %d\n", type);
982 return __irq_domain_alloc_irqs(domain, irq, 1,
983 ioapic_alloc_attr_node(info),
988 * Need special handling for ISA IRQs because there may be multiple IOAPIC pins
989 * sharing the same ISA IRQ number and irqdomain only supports 1:1 mapping
990 * between IOAPIC pin and IRQ number. A typical IOAPIC has 24 pins, pin 0-15 are
991 * used for legacy IRQs and pin 16-23 are used for PCI IRQs (PIRQ A-H).
992 * When ACPI is disabled, only legacy IRQ numbers (IRQ0-15) are available, and
993 * some BIOSes may use MP Interrupt Source records to override IRQ numbers for
994 * PIRQs instead of reprogramming the interrupt routing logic. Thus there may be
995 * multiple pins sharing the same legacy IRQ number when ACPI is disabled.
997 static int alloc_isa_irq_from_domain(struct irq_domain *domain,
998 int irq, int ioapic, int pin,
999 struct irq_alloc_info *info)
1001 struct mp_chip_data *data;
1002 struct irq_data *irq_data = irq_get_irq_data(irq);
1003 int node = ioapic_alloc_attr_node(info);
1006 * Legacy ISA IRQ has already been allocated, just add pin to
1007 * the pin list assoicated with this IRQ and program the IOAPIC
1008 * entry. The IOAPIC entry
1010 if (irq_data && irq_data->parent_data) {
1011 if (!mp_check_pin_attr(irq, info))
1013 if (__add_pin_to_irq_node(irq_data->chip_data, node, ioapic,
1017 irq = __irq_domain_alloc_irqs(domain, irq, 1, node, info, true);
1019 irq_data = irq_domain_get_irq_data(domain, irq);
1020 data = irq_data->chip_data;
1021 data->isa_irq = true;
1028 static int mp_map_pin_to_irq(u32 gsi, int idx, int ioapic, int pin,
1029 unsigned int flags, struct irq_alloc_info *info)
1032 bool legacy = false;
1033 struct irq_alloc_info tmp;
1034 struct mp_chip_data *data;
1035 struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
1040 if (idx >= 0 && test_bit(mp_irqs[idx].srcbus, mp_bus_not_pci)) {
1041 irq = mp_irqs[idx].srcbusirq;
1042 legacy = mp_is_legacy_irq(irq);
1044 * IRQ2 is unusable for historical reasons on systems which
1045 * have a legacy PIC. See the comment vs. IRQ2 further down.
1047 * If this gets removed at some point then the related code
1048 * in lapic_assign_system_vectors() needs to be adjusted as
1051 if (legacy && irq == PIC_CASCADE_IR)
1055 mutex_lock(&ioapic_mutex);
1056 if (!(flags & IOAPIC_MAP_ALLOC)) {
1058 irq = irq_find_mapping(domain, pin);
1063 ioapic_copy_alloc_attr(&tmp, info, gsi, ioapic, pin);
1065 irq = alloc_isa_irq_from_domain(domain, irq,
1067 else if ((irq = irq_find_mapping(domain, pin)) == 0)
1068 irq = alloc_irq_from_domain(domain, ioapic, gsi, &tmp);
1069 else if (!mp_check_pin_attr(irq, &tmp))
1072 data = irq_get_chip_data(irq);
1076 mutex_unlock(&ioapic_mutex);
1081 static int pin_2_irq(int idx, int ioapic, int pin, unsigned int flags)
1083 u32 gsi = mp_pin_to_gsi(ioapic, pin);
1086 * Debugging check, we are in big trouble if this message pops up!
1088 if (mp_irqs[idx].dstirq != pin)
1089 pr_err("broken BIOS or MPTABLE parser, ayiee!!\n");
1091 #ifdef CONFIG_X86_32
1093 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1095 if ((pin >= 16) && (pin <= 23)) {
1096 if (pirq_entries[pin-16] != -1) {
1097 if (!pirq_entries[pin-16]) {
1098 apic_printk(APIC_VERBOSE, KERN_DEBUG
1099 "disabling PIRQ%d\n", pin-16);
1101 int irq = pirq_entries[pin-16];
1102 apic_printk(APIC_VERBOSE, KERN_DEBUG
1103 "using PIRQ%d -> IRQ %d\n",
1111 return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, NULL);
1114 int mp_map_gsi_to_irq(u32 gsi, unsigned int flags, struct irq_alloc_info *info)
1116 int ioapic, pin, idx;
1118 ioapic = mp_find_ioapic(gsi);
1122 pin = mp_find_ioapic_pin(ioapic, gsi);
1123 idx = find_irq_entry(ioapic, pin, mp_INT);
1124 if ((flags & IOAPIC_MAP_CHECK) && idx < 0)
1127 return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, info);
1130 void mp_unmap_irq(int irq)
1132 struct irq_data *irq_data = irq_get_irq_data(irq);
1133 struct mp_chip_data *data;
1135 if (!irq_data || !irq_data->domain)
1138 data = irq_data->chip_data;
1139 if (!data || data->isa_irq)
1142 mutex_lock(&ioapic_mutex);
1143 if (--data->count == 0)
1144 irq_domain_free_irqs(irq, 1);
1145 mutex_unlock(&ioapic_mutex);
1149 * Find a specific PCI IRQ entry.
1150 * Not an __init, possibly needed by modules
1152 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
1154 int irq, i, best_ioapic = -1, best_idx = -1;
1156 apic_printk(APIC_DEBUG,
1157 "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
1159 if (test_bit(bus, mp_bus_not_pci)) {
1160 apic_printk(APIC_VERBOSE,
1161 "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
1165 for (i = 0; i < mp_irq_entries; i++) {
1166 int lbus = mp_irqs[i].srcbus;
1167 int ioapic_idx, found = 0;
1169 if (bus != lbus || mp_irqs[i].irqtype != mp_INT ||
1170 slot != ((mp_irqs[i].srcbusirq >> 2) & 0x1f))
1173 for_each_ioapic(ioapic_idx)
1174 if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic ||
1175 mp_irqs[i].dstapic == MP_APIC_ALL) {
1183 irq = pin_2_irq(i, ioapic_idx, mp_irqs[i].dstirq, 0);
1184 if (irq > 0 && !IO_APIC_IRQ(irq))
1187 if (pin == (mp_irqs[i].srcbusirq & 3)) {
1189 best_ioapic = ioapic_idx;
1194 * Use the first all-but-pin matching entry as a
1195 * best-guess fuzzy result for broken mptables.
1199 best_ioapic = ioapic_idx;
1206 return pin_2_irq(best_idx, best_ioapic, mp_irqs[best_idx].dstirq,
1209 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
1211 static struct irq_chip ioapic_chip, ioapic_ir_chip;
1213 #ifdef CONFIG_X86_32
1214 static inline int IO_APIC_irq_trigger(int irq)
1218 for_each_ioapic_pin(apic, pin) {
1219 idx = find_irq_entry(apic, pin, mp_INT);
1220 if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin, 0)))
1221 return irq_trigger(idx);
1224 * nonexistent IRQs are edge default
1229 static inline int IO_APIC_irq_trigger(int irq)
1235 static void __init setup_IO_APIC_irqs(void)
1237 unsigned int ioapic, pin;
1240 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1242 for_each_ioapic_pin(ioapic, pin) {
1243 idx = find_irq_entry(ioapic, pin, mp_INT);
1245 apic_printk(APIC_VERBOSE,
1246 KERN_DEBUG " apic %d pin %d not connected\n",
1247 mpc_ioapic_id(ioapic), pin);
1249 pin_2_irq(idx, ioapic, pin,
1250 ioapic ? 0 : IOAPIC_MAP_ALLOC);
1254 void ioapic_zap_locks(void)
1256 raw_spin_lock_init(&ioapic_lock);
1259 static void io_apic_print_entries(unsigned int apic, unsigned int nr_entries)
1263 struct IO_APIC_route_entry entry;
1264 struct IR_IO_APIC_route_entry *ir_entry = (void *)&entry;
1266 printk(KERN_DEBUG "IOAPIC %d:\n", apic);
1267 for (i = 0; i <= nr_entries; i++) {
1268 entry = ioapic_read_entry(apic, i);
1269 snprintf(buf, sizeof(buf),
1270 " pin%02x, %s, %s, %s, V(%02X), IRR(%1d), S(%1d)",
1272 entry.mask == IOAPIC_MASKED ? "disabled" : "enabled ",
1273 entry.trigger == IOAPIC_LEVEL ? "level" : "edge ",
1274 entry.polarity == IOAPIC_POL_LOW ? "low " : "high",
1275 entry.vector, entry.irr, entry.delivery_status);
1276 if (ir_entry->format)
1277 printk(KERN_DEBUG "%s, remapped, I(%04X), Z(%X)\n",
1278 buf, (ir_entry->index << 15) | ir_entry->index,
1281 printk(KERN_DEBUG "%s, %s, D(%02X), M(%1d)\n",
1283 entry.dest_mode == IOAPIC_DEST_MODE_LOGICAL ?
1284 "logical " : "physical",
1285 entry.dest, entry.delivery_mode);
1289 static void __init print_IO_APIC(int ioapic_idx)
1291 union IO_APIC_reg_00 reg_00;
1292 union IO_APIC_reg_01 reg_01;
1293 union IO_APIC_reg_02 reg_02;
1294 union IO_APIC_reg_03 reg_03;
1295 unsigned long flags;
1297 raw_spin_lock_irqsave(&ioapic_lock, flags);
1298 reg_00.raw = io_apic_read(ioapic_idx, 0);
1299 reg_01.raw = io_apic_read(ioapic_idx, 1);
1300 if (reg_01.bits.version >= 0x10)
1301 reg_02.raw = io_apic_read(ioapic_idx, 2);
1302 if (reg_01.bits.version >= 0x20)
1303 reg_03.raw = io_apic_read(ioapic_idx, 3);
1304 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1306 printk(KERN_DEBUG "IO APIC #%d......\n", mpc_ioapic_id(ioapic_idx));
1307 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1308 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1309 printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
1310 printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
1312 printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
1313 printk(KERN_DEBUG "....... : max redirection entries: %02X\n",
1314 reg_01.bits.entries);
1316 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1317 printk(KERN_DEBUG "....... : IO APIC version: %02X\n",
1318 reg_01.bits.version);
1321 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1322 * but the value of reg_02 is read as the previous read register
1323 * value, so ignore it if reg_02 == reg_01.
1325 if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1326 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1327 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1331 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1332 * or reg_03, but the value of reg_0[23] is read as the previous read
1333 * register value, so ignore it if reg_03 == reg_0[12].
1335 if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1336 reg_03.raw != reg_01.raw) {
1337 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1338 printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
1341 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1342 io_apic_print_entries(ioapic_idx, reg_01.bits.entries);
1345 void __init print_IO_APICs(void)
1350 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1351 for_each_ioapic(ioapic_idx)
1352 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1353 mpc_ioapic_id(ioapic_idx),
1354 ioapics[ioapic_idx].nr_registers);
1357 * We are a bit conservative about what we expect. We have to
1358 * know about every hardware change ASAP.
1360 printk(KERN_INFO "testing the IO APIC.......................\n");
1362 for_each_ioapic(ioapic_idx)
1363 print_IO_APIC(ioapic_idx);
1365 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1366 for_each_active_irq(irq) {
1367 struct irq_pin_list *entry;
1368 struct irq_chip *chip;
1369 struct mp_chip_data *data;
1371 chip = irq_get_chip(irq);
1372 if (chip != &ioapic_chip && chip != &ioapic_ir_chip)
1374 data = irq_get_chip_data(irq);
1377 if (list_empty(&data->irq_2_pin))
1380 printk(KERN_DEBUG "IRQ%d ", irq);
1381 for_each_irq_pin(entry, data->irq_2_pin)
1382 pr_cont("-> %d:%d", entry->apic, entry->pin);
1386 printk(KERN_INFO ".................................... done.\n");
1389 /* Where if anywhere is the i8259 connect in external int mode */
1390 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
1392 void __init enable_IO_APIC(void)
1394 int i8259_apic, i8259_pin;
1397 if (skip_ioapic_setup)
1400 if (!nr_legacy_irqs() || !nr_ioapics)
1403 for_each_ioapic_pin(apic, pin) {
1404 /* See if any of the pins is in ExtINT mode */
1405 struct IO_APIC_route_entry entry = ioapic_read_entry(apic, pin);
1407 /* If the interrupt line is enabled and in ExtInt mode
1408 * I have found the pin where the i8259 is connected.
1410 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1411 ioapic_i8259.apic = apic;
1412 ioapic_i8259.pin = pin;
1417 /* Look to see what if the MP table has reported the ExtINT */
1418 /* If we could not find the appropriate pin by looking at the ioapic
1419 * the i8259 probably is not connected the ioapic but give the
1420 * mptable a chance anyway.
1422 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1423 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1424 /* Trust the MP table if nothing is setup in the hardware */
1425 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1426 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1427 ioapic_i8259.pin = i8259_pin;
1428 ioapic_i8259.apic = i8259_apic;
1430 /* Complain if the MP table and the hardware disagree */
1431 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1432 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1434 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1438 * Do not trust the IO-APIC being empty at bootup
1443 void native_disable_io_apic(void)
1446 * If the i8259 is routed through an IOAPIC
1447 * Put that IOAPIC in virtual wire mode
1448 * so legacy interrupts can be delivered.
1450 if (ioapic_i8259.pin != -1) {
1451 struct IO_APIC_route_entry entry;
1453 memset(&entry, 0, sizeof(entry));
1454 entry.mask = IOAPIC_UNMASKED;
1455 entry.trigger = IOAPIC_EDGE;
1456 entry.polarity = IOAPIC_POL_HIGH;
1457 entry.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
1458 entry.delivery_mode = dest_ExtINT;
1459 entry.dest = read_apic_id();
1462 * Add it to the IO-APIC irq-routing table:
1464 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1467 if (cpu_has_apic || apic_from_smp_config())
1468 disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1472 * Not an __init, needed by the reboot code
1474 void disable_IO_APIC(void)
1477 * Clear the IO-APIC before rebooting:
1481 if (!nr_legacy_irqs())
1484 x86_io_apic_ops.disable();
1487 #ifdef CONFIG_X86_32
1489 * function to set the IO-APIC physical IDs based on the
1490 * values stored in the MPC table.
1492 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
1494 void __init setup_ioapic_ids_from_mpc_nocheck(void)
1496 union IO_APIC_reg_00 reg_00;
1497 physid_mask_t phys_id_present_map;
1500 unsigned char old_id;
1501 unsigned long flags;
1504 * This is broken; anything with a real cpu count has to
1505 * circumvent this idiocy regardless.
1507 apic->ioapic_phys_id_map(&phys_cpu_present_map, &phys_id_present_map);
1510 * Set the IOAPIC ID to the value stored in the MPC table.
1512 for_each_ioapic(ioapic_idx) {
1513 /* Read the register 0 value */
1514 raw_spin_lock_irqsave(&ioapic_lock, flags);
1515 reg_00.raw = io_apic_read(ioapic_idx, 0);
1516 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1518 old_id = mpc_ioapic_id(ioapic_idx);
1520 if (mpc_ioapic_id(ioapic_idx) >= get_physical_broadcast()) {
1521 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
1522 ioapic_idx, mpc_ioapic_id(ioapic_idx));
1523 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1525 ioapics[ioapic_idx].mp_config.apicid = reg_00.bits.ID;
1529 * Sanity check, is the ID really free? Every APIC in a
1530 * system must have a unique ID or we get lots of nice
1531 * 'stuck on smp_invalidate_needed IPI wait' messages.
1533 if (apic->check_apicid_used(&phys_id_present_map,
1534 mpc_ioapic_id(ioapic_idx))) {
1535 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
1536 ioapic_idx, mpc_ioapic_id(ioapic_idx));
1537 for (i = 0; i < get_physical_broadcast(); i++)
1538 if (!physid_isset(i, phys_id_present_map))
1540 if (i >= get_physical_broadcast())
1541 panic("Max APIC ID exceeded!\n");
1542 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1544 physid_set(i, phys_id_present_map);
1545 ioapics[ioapic_idx].mp_config.apicid = i;
1548 apic->apicid_to_cpu_present(mpc_ioapic_id(ioapic_idx),
1550 apic_printk(APIC_VERBOSE, "Setting %d in the "
1551 "phys_id_present_map\n",
1552 mpc_ioapic_id(ioapic_idx));
1553 physids_or(phys_id_present_map, phys_id_present_map, tmp);
1557 * We need to adjust the IRQ routing table
1558 * if the ID changed.
1560 if (old_id != mpc_ioapic_id(ioapic_idx))
1561 for (i = 0; i < mp_irq_entries; i++)
1562 if (mp_irqs[i].dstapic == old_id)
1564 = mpc_ioapic_id(ioapic_idx);
1567 * Update the ID register according to the right value
1568 * from the MPC table if they are different.
1570 if (mpc_ioapic_id(ioapic_idx) == reg_00.bits.ID)
1573 apic_printk(APIC_VERBOSE, KERN_INFO
1574 "...changing IO-APIC physical APIC ID to %d ...",
1575 mpc_ioapic_id(ioapic_idx));
1577 reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
1578 raw_spin_lock_irqsave(&ioapic_lock, flags);
1579 io_apic_write(ioapic_idx, 0, reg_00.raw);
1580 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1585 raw_spin_lock_irqsave(&ioapic_lock, flags);
1586 reg_00.raw = io_apic_read(ioapic_idx, 0);
1587 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1588 if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx))
1589 pr_cont("could not set ID!\n");
1591 apic_printk(APIC_VERBOSE, " ok.\n");
1595 void __init setup_ioapic_ids_from_mpc(void)
1601 * Don't check I/O APIC IDs for xAPIC systems. They have
1602 * no meaning without the serial APIC bus.
1604 if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
1605 || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
1607 setup_ioapic_ids_from_mpc_nocheck();
1611 int no_timer_check __initdata;
1613 static int __init notimercheck(char *s)
1618 __setup("no_timer_check", notimercheck);
1621 * There is a nasty bug in some older SMP boards, their mptable lies
1622 * about the timer IRQ. We do the following to work around the situation:
1624 * - timer IRQ defaults to IO-APIC IRQ
1625 * - if this function detects that timer IRQs are defunct, then we fall
1626 * back to ISA timer IRQs
1628 static int __init timer_irq_works(void)
1630 unsigned long t1 = jiffies;
1631 unsigned long flags;
1636 local_save_flags(flags);
1638 /* Let ten ticks pass... */
1639 mdelay((10 * 1000) / HZ);
1640 local_irq_restore(flags);
1643 * Expect a few ticks at least, to be sure some possible
1644 * glue logic does not lock up after one or two first
1645 * ticks in a non-ExtINT mode. Also the local APIC
1646 * might have cached one ExtINT interrupt. Finally, at
1647 * least one tick may be lost due to delays.
1651 if (time_after(jiffies, t1 + 4))
1657 * In the SMP+IOAPIC case it might happen that there are an unspecified
1658 * number of pending IRQ events unhandled. These cases are very rare,
1659 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1660 * better to do it this way as thus we do not have to be aware of
1661 * 'pending' interrupts in the IRQ path, except at this point.
1664 * Edge triggered needs to resend any interrupt
1665 * that was delayed but this is now handled in the device
1670 * Starting up a edge-triggered IO-APIC interrupt is
1671 * nasty - we need to make sure that we get the edge.
1672 * If it is already asserted for some reason, we need
1673 * return 1 to indicate that is was pending.
1675 * This is not complete - we should be able to fake
1676 * an edge even if it isn't on the 8259A...
1678 static unsigned int startup_ioapic_irq(struct irq_data *data)
1680 int was_pending = 0, irq = data->irq;
1681 unsigned long flags;
1683 raw_spin_lock_irqsave(&ioapic_lock, flags);
1684 if (irq < nr_legacy_irqs()) {
1685 legacy_pic->mask(irq);
1686 if (legacy_pic->irq_pending(irq))
1689 __unmask_ioapic(data->chip_data);
1690 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1695 atomic_t irq_mis_count;
1697 #ifdef CONFIG_GENERIC_PENDING_IRQ
1698 static bool io_apic_level_ack_pending(struct mp_chip_data *data)
1700 struct irq_pin_list *entry;
1701 unsigned long flags;
1703 raw_spin_lock_irqsave(&ioapic_lock, flags);
1704 for_each_irq_pin(entry, data->irq_2_pin) {
1709 reg = io_apic_read(entry->apic, 0x10 + pin*2);
1710 /* Is the remote IRR bit set? */
1711 if (reg & IO_APIC_REDIR_REMOTE_IRR) {
1712 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1716 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1721 static inline bool ioapic_irqd_mask(struct irq_data *data)
1723 /* If we are moving the IRQ we need to mask it */
1724 if (unlikely(irqd_is_setaffinity_pending(data))) {
1725 if (!irqd_irq_masked(data))
1726 mask_ioapic_irq(data);
1732 static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
1734 if (unlikely(masked)) {
1735 /* Only migrate the irq if the ack has been received.
1737 * On rare occasions the broadcast level triggered ack gets
1738 * delayed going to ioapics, and if we reprogram the
1739 * vector while Remote IRR is still set the irq will never
1742 * To prevent this scenario we read the Remote IRR bit
1743 * of the ioapic. This has two effects.
1744 * - On any sane system the read of the ioapic will
1745 * flush writes (and acks) going to the ioapic from
1747 * - We get to see if the ACK has actually been delivered.
1749 * Based on failed experiments of reprogramming the
1750 * ioapic entry from outside of irq context starting
1751 * with masking the ioapic entry and then polling until
1752 * Remote IRR was clear before reprogramming the
1753 * ioapic I don't trust the Remote IRR bit to be
1754 * completey accurate.
1756 * However there appears to be no other way to plug
1757 * this race, so if the Remote IRR bit is not
1758 * accurate and is causing problems then it is a hardware bug
1759 * and you can go talk to the chipset vendor about it.
1761 if (!io_apic_level_ack_pending(data->chip_data))
1762 irq_move_masked_irq(data);
1763 /* If the IRQ is masked in the core, leave it: */
1764 if (!irqd_irq_masked(data))
1765 unmask_ioapic_irq(data);
1769 static inline bool ioapic_irqd_mask(struct irq_data *data)
1773 static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
1778 static void ioapic_ack_level(struct irq_data *irq_data)
1780 struct irq_cfg *cfg = irqd_cfg(irq_data);
1785 irq_complete_move(cfg);
1786 masked = ioapic_irqd_mask(irq_data);
1789 * It appears there is an erratum which affects at least version 0x11
1790 * of I/O APIC (that's the 82093AA and cores integrated into various
1791 * chipsets). Under certain conditions a level-triggered interrupt is
1792 * erroneously delivered as edge-triggered one but the respective IRR
1793 * bit gets set nevertheless. As a result the I/O unit expects an EOI
1794 * message but it will never arrive and further interrupts are blocked
1795 * from the source. The exact reason is so far unknown, but the
1796 * phenomenon was observed when two consecutive interrupt requests
1797 * from a given source get delivered to the same CPU and the source is
1798 * temporarily disabled in between.
1800 * A workaround is to simulate an EOI message manually. We achieve it
1801 * by setting the trigger mode to edge and then to level when the edge
1802 * trigger mode gets detected in the TMR of a local APIC for a
1803 * level-triggered interrupt. We mask the source for the time of the
1804 * operation to prevent an edge-triggered interrupt escaping meanwhile.
1805 * The idea is from Manfred Spraul. --macro
1807 * Also in the case when cpu goes offline, fixup_irqs() will forward
1808 * any unhandled interrupt on the offlined cpu to the new cpu
1809 * destination that is handling the corresponding interrupt. This
1810 * interrupt forwarding is done via IPI's. Hence, in this case also
1811 * level-triggered io-apic interrupt will be seen as an edge
1812 * interrupt in the IRR. And we can't rely on the cpu's EOI
1813 * to be broadcasted to the IO-APIC's which will clear the remoteIRR
1814 * corresponding to the level-triggered interrupt. Hence on IO-APIC's
1815 * supporting EOI register, we do an explicit EOI to clear the
1816 * remote IRR and on IO-APIC's which don't have an EOI register,
1817 * we use the above logic (mask+edge followed by unmask+level) from
1818 * Manfred Spraul to clear the remote IRR.
1821 v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
1824 * We must acknowledge the irq before we move it or the acknowledge will
1825 * not propagate properly.
1830 * Tail end of clearing remote IRR bit (either by delivering the EOI
1831 * message via io-apic EOI register write or simulating it using
1832 * mask+edge followed by unnask+level logic) manually when the
1833 * level triggered interrupt is seen as the edge triggered interrupt
1836 if (!(v & (1 << (i & 0x1f)))) {
1837 atomic_inc(&irq_mis_count);
1838 eoi_ioapic_pin(cfg->vector, irq_data->chip_data);
1841 ioapic_irqd_unmask(irq_data, masked);
1844 static void ioapic_ir_ack_level(struct irq_data *irq_data)
1846 struct mp_chip_data *data = irq_data->chip_data;
1849 * Intr-remapping uses pin number as the virtual vector
1850 * in the RTE. Actual vector is programmed in
1851 * intr-remapping table entry. Hence for the io-apic
1852 * EOI we use the pin number.
1855 eoi_ioapic_pin(data->entry.vector, data);
1858 static int ioapic_set_affinity(struct irq_data *irq_data,
1859 const struct cpumask *mask, bool force)
1861 struct irq_data *parent = irq_data->parent_data;
1862 struct mp_chip_data *data = irq_data->chip_data;
1863 struct irq_pin_list *entry;
1864 struct irq_cfg *cfg;
1865 unsigned long flags;
1868 ret = parent->chip->irq_set_affinity(parent, mask, force);
1869 raw_spin_lock_irqsave(&ioapic_lock, flags);
1870 if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) {
1871 cfg = irqd_cfg(irq_data);
1872 data->entry.dest = cfg->dest_apicid;
1873 data->entry.vector = cfg->vector;
1874 for_each_irq_pin(entry, data->irq_2_pin)
1875 __ioapic_write_entry(entry->apic, entry->pin,
1878 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
1883 static struct irq_chip ioapic_chip __read_mostly = {
1885 .irq_startup = startup_ioapic_irq,
1886 .irq_mask = mask_ioapic_irq,
1887 .irq_unmask = unmask_ioapic_irq,
1888 .irq_ack = irq_chip_ack_parent,
1889 .irq_eoi = ioapic_ack_level,
1890 .irq_set_affinity = ioapic_set_affinity,
1891 .irq_retrigger = irq_chip_retrigger_hierarchy,
1892 .flags = IRQCHIP_SKIP_SET_WAKE,
1895 static struct irq_chip ioapic_ir_chip __read_mostly = {
1896 .name = "IR-IO-APIC",
1897 .irq_startup = startup_ioapic_irq,
1898 .irq_mask = mask_ioapic_irq,
1899 .irq_unmask = unmask_ioapic_irq,
1900 .irq_ack = irq_chip_ack_parent,
1901 .irq_eoi = ioapic_ir_ack_level,
1902 .irq_set_affinity = ioapic_set_affinity,
1903 .irq_retrigger = irq_chip_retrigger_hierarchy,
1904 .flags = IRQCHIP_SKIP_SET_WAKE,
1907 static inline void init_IO_APIC_traps(void)
1909 struct irq_cfg *cfg;
1912 for_each_active_irq(irq) {
1914 if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
1916 * Hmm.. We don't have an entry for this,
1917 * so default to an old-fashioned 8259
1918 * interrupt if we can..
1920 if (irq < nr_legacy_irqs())
1921 legacy_pic->make_irq(irq);
1923 /* Strange. Oh, well.. */
1924 irq_set_chip(irq, &no_irq_chip);
1930 * The local APIC irq-chip implementation:
1933 static void mask_lapic_irq(struct irq_data *data)
1937 v = apic_read(APIC_LVT0);
1938 apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
1941 static void unmask_lapic_irq(struct irq_data *data)
1945 v = apic_read(APIC_LVT0);
1946 apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
1949 static void ack_lapic_irq(struct irq_data *data)
1954 static struct irq_chip lapic_chip __read_mostly = {
1955 .name = "local-APIC",
1956 .irq_mask = mask_lapic_irq,
1957 .irq_unmask = unmask_lapic_irq,
1958 .irq_ack = ack_lapic_irq,
1961 static void lapic_register_intr(int irq)
1963 irq_clear_status_flags(irq, IRQ_LEVEL);
1964 irq_set_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
1969 * This looks a bit hackish but it's about the only one way of sending
1970 * a few INTA cycles to 8259As and any associated glue logic. ICR does
1971 * not support the ExtINT mode, unfortunately. We need to send these
1972 * cycles as some i82489DX-based boards have glue logic that keeps the
1973 * 8259A interrupt line asserted until INTA. --macro
1975 static inline void __init unlock_ExtINT_logic(void)
1978 struct IO_APIC_route_entry entry0, entry1;
1979 unsigned char save_control, save_freq_select;
1981 pin = find_isa_irq_pin(8, mp_INT);
1986 apic = find_isa_irq_apic(8, mp_INT);
1992 entry0 = ioapic_read_entry(apic, pin);
1993 clear_IO_APIC_pin(apic, pin);
1995 memset(&entry1, 0, sizeof(entry1));
1997 entry1.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
1998 entry1.mask = IOAPIC_UNMASKED;
1999 entry1.dest = hard_smp_processor_id();
2000 entry1.delivery_mode = dest_ExtINT;
2001 entry1.polarity = entry0.polarity;
2002 entry1.trigger = IOAPIC_EDGE;
2005 ioapic_write_entry(apic, pin, entry1);
2007 save_control = CMOS_READ(RTC_CONTROL);
2008 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2009 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2011 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2016 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2020 CMOS_WRITE(save_control, RTC_CONTROL);
2021 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2022 clear_IO_APIC_pin(apic, pin);
2024 ioapic_write_entry(apic, pin, entry0);
2027 static int disable_timer_pin_1 __initdata;
2028 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2029 static int __init disable_timer_pin_setup(char *arg)
2031 disable_timer_pin_1 = 1;
2034 early_param("disable_timer_pin_1", disable_timer_pin_setup);
2036 static int mp_alloc_timer_irq(int ioapic, int pin)
2039 struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
2042 struct irq_alloc_info info;
2044 ioapic_set_alloc_attr(&info, NUMA_NO_NODE, 0, 0);
2045 info.ioapic_id = mpc_ioapic_id(ioapic);
2046 info.ioapic_pin = pin;
2047 mutex_lock(&ioapic_mutex);
2048 irq = alloc_isa_irq_from_domain(domain, 0, ioapic, pin, &info);
2049 mutex_unlock(&ioapic_mutex);
2056 * This code may look a bit paranoid, but it's supposed to cooperate with
2057 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2058 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2059 * fanatically on his truly buggy board.
2061 * FIXME: really need to revamp this for all platforms.
2063 static inline void __init check_timer(void)
2065 struct irq_data *irq_data = irq_get_irq_data(0);
2066 struct mp_chip_data *data = irq_data->chip_data;
2067 struct irq_cfg *cfg = irqd_cfg(irq_data);
2068 int node = cpu_to_node(0);
2069 int apic1, pin1, apic2, pin2;
2070 unsigned long flags;
2073 local_irq_save(flags);
2076 * get/set the timer IRQ vector:
2078 legacy_pic->mask(0);
2081 * As IRQ0 is to be enabled in the 8259A, the virtual
2082 * wire has to be disabled in the local APIC. Also
2083 * timer interrupts need to be acknowledged manually in
2084 * the 8259A for the i82489DX when using the NMI
2085 * watchdog as that APIC treats NMIs as level-triggered.
2086 * The AEOI mode will finish them in the 8259A
2089 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2090 legacy_pic->init(1);
2092 pin1 = find_isa_irq_pin(0, mp_INT);
2093 apic1 = find_isa_irq_apic(0, mp_INT);
2094 pin2 = ioapic_i8259.pin;
2095 apic2 = ioapic_i8259.apic;
2097 apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
2098 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2099 cfg->vector, apic1, pin1, apic2, pin2);
2102 * Some BIOS writers are clueless and report the ExtINTA
2103 * I/O APIC input from the cascaded 8259A as the timer
2104 * interrupt input. So just in case, if only one pin
2105 * was found above, try it both directly and through the
2109 panic_if_irq_remap("BIOS bug: timer not connected to IO-APIC");
2113 } else if (pin2 == -1) {
2119 /* Ok, does IRQ0 through the IOAPIC work? */
2121 mp_alloc_timer_irq(apic1, pin1);
2124 * for edge trigger, it's already unmasked,
2125 * so only need to unmask if it is level-trigger
2126 * do we really have level trigger timer?
2129 idx = find_irq_entry(apic1, pin1, mp_INT);
2130 if (idx != -1 && irq_trigger(idx))
2131 unmask_ioapic_irq(irq_get_irq_data(0));
2133 irq_domain_deactivate_irq(irq_data);
2134 irq_domain_activate_irq(irq_data);
2135 if (timer_irq_works()) {
2136 if (disable_timer_pin_1 > 0)
2137 clear_IO_APIC_pin(0, pin1);
2140 panic_if_irq_remap("timer doesn't work through Interrupt-remapped IO-APIC");
2141 local_irq_disable();
2142 clear_IO_APIC_pin(apic1, pin1);
2144 apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
2145 "8254 timer not connected to IO-APIC\n");
2147 apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
2148 "(IRQ0) through the 8259A ...\n");
2149 apic_printk(APIC_QUIET, KERN_INFO
2150 "..... (found apic %d pin %d) ...\n", apic2, pin2);
2152 * legacy devices should be connected to IO APIC #0
2154 replace_pin_at_irq_node(data, node, apic1, pin1, apic2, pin2);
2155 irq_domain_deactivate_irq(irq_data);
2156 irq_domain_activate_irq(irq_data);
2157 legacy_pic->unmask(0);
2158 if (timer_irq_works()) {
2159 apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
2163 * Cleanup, just in case ...
2165 local_irq_disable();
2166 legacy_pic->mask(0);
2167 clear_IO_APIC_pin(apic2, pin2);
2168 apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
2171 apic_printk(APIC_QUIET, KERN_INFO
2172 "...trying to set up timer as Virtual Wire IRQ...\n");
2174 lapic_register_intr(0);
2175 apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
2176 legacy_pic->unmask(0);
2178 if (timer_irq_works()) {
2179 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2182 local_irq_disable();
2183 legacy_pic->mask(0);
2184 apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
2185 apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
2187 apic_printk(APIC_QUIET, KERN_INFO
2188 "...trying to set up timer as ExtINT IRQ...\n");
2190 legacy_pic->init(0);
2191 legacy_pic->make_irq(0);
2192 apic_write(APIC_LVT0, APIC_DM_EXTINT);
2194 unlock_ExtINT_logic();
2196 if (timer_irq_works()) {
2197 apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
2200 local_irq_disable();
2201 apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
2202 if (apic_is_x2apic_enabled())
2203 apic_printk(APIC_QUIET, KERN_INFO
2204 "Perhaps problem with the pre-enabled x2apic mode\n"
2205 "Try booting with x2apic and interrupt-remapping disabled in the bios.\n");
2206 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
2207 "report. Then try booting with the 'noapic' option.\n");
2209 local_irq_restore(flags);
2213 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
2214 * to devices. However there may be an I/O APIC pin available for
2215 * this interrupt regardless. The pin may be left unconnected, but
2216 * typically it will be reused as an ExtINT cascade interrupt for
2217 * the master 8259A. In the MPS case such a pin will normally be
2218 * reported as an ExtINT interrupt in the MP table. With ACPI
2219 * there is no provision for ExtINT interrupts, and in the absence
2220 * of an override it would be treated as an ordinary ISA I/O APIC
2221 * interrupt, that is edge-triggered and unmasked by default. We
2222 * used to do this, but it caused problems on some systems because
2223 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
2224 * the same ExtINT cascade interrupt to drive the local APIC of the
2225 * bootstrap processor. Therefore we refrain from routing IRQ2 to
2226 * the I/O APIC in all cases now. No actual device should request
2227 * it anyway. --macro
2229 #define PIC_IRQS (1UL << PIC_CASCADE_IR)
2231 static int mp_irqdomain_create(int ioapic)
2233 struct irq_alloc_info info;
2234 struct irq_domain *parent;
2235 int hwirqs = mp_ioapic_pin_count(ioapic);
2236 struct ioapic *ip = &ioapics[ioapic];
2237 struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg;
2238 struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
2240 if (cfg->type == IOAPIC_DOMAIN_INVALID)
2243 init_irq_alloc_info(&info, NULL);
2244 info.type = X86_IRQ_ALLOC_TYPE_IOAPIC;
2245 info.ioapic_id = mpc_ioapic_id(ioapic);
2246 parent = irq_remapping_get_ir_irq_domain(&info);
2248 parent = x86_vector_domain;
2250 ip->irqdomain = irq_domain_add_linear(cfg->dev, hwirqs, cfg->ops,
2251 (void *)(long)ioapic);
2255 ip->irqdomain->parent = parent;
2257 if (cfg->type == IOAPIC_DOMAIN_LEGACY ||
2258 cfg->type == IOAPIC_DOMAIN_STRICT)
2259 ioapic_dynirq_base = max(ioapic_dynirq_base,
2260 gsi_cfg->gsi_end + 1);
2265 static void ioapic_destroy_irqdomain(int idx)
2267 if (ioapics[idx].irqdomain) {
2268 irq_domain_remove(ioapics[idx].irqdomain);
2269 ioapics[idx].irqdomain = NULL;
2273 void __init setup_IO_APIC(void)
2277 if (skip_ioapic_setup || !nr_ioapics)
2280 io_apic_irqs = nr_legacy_irqs() ? ~PIC_IRQS : ~0UL;
2282 apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
2283 for_each_ioapic(ioapic)
2284 BUG_ON(mp_irqdomain_create(ioapic));
2287 * Set up IO-APIC IRQ routing.
2289 x86_init.mpparse.setup_ioapic_ids();
2292 setup_IO_APIC_irqs();
2293 init_IO_APIC_traps();
2294 if (nr_legacy_irqs())
2297 ioapic_initialized = 1;
2300 static void resume_ioapic_id(int ioapic_idx)
2302 unsigned long flags;
2303 union IO_APIC_reg_00 reg_00;
2305 raw_spin_lock_irqsave(&ioapic_lock, flags);
2306 reg_00.raw = io_apic_read(ioapic_idx, 0);
2307 if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx)) {
2308 reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
2309 io_apic_write(ioapic_idx, 0, reg_00.raw);
2311 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2314 static void ioapic_resume(void)
2318 for_each_ioapic_reverse(ioapic_idx)
2319 resume_ioapic_id(ioapic_idx);
2321 restore_ioapic_entries();
2324 static struct syscore_ops ioapic_syscore_ops = {
2325 .suspend = save_ioapic_entries,
2326 .resume = ioapic_resume,
2329 static int __init ioapic_init_ops(void)
2331 register_syscore_ops(&ioapic_syscore_ops);
2336 device_initcall(ioapic_init_ops);
2338 static int io_apic_get_redir_entries(int ioapic)
2340 union IO_APIC_reg_01 reg_01;
2341 unsigned long flags;
2343 raw_spin_lock_irqsave(&ioapic_lock, flags);
2344 reg_01.raw = io_apic_read(ioapic, 1);
2345 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2347 /* The register returns the maximum index redir index
2348 * supported, which is one less than the total number of redir
2351 return reg_01.bits.entries + 1;
2354 unsigned int arch_dynirq_lower_bound(unsigned int from)
2357 * dmar_alloc_hwirq() may be called before setup_IO_APIC(), so use
2358 * gsi_top if ioapic_dynirq_base hasn't been initialized yet.
2360 if (!ioapic_initialized)
2363 * For DT enabled machines ioapic_dynirq_base is irrelevant and not
2364 * updated. So simply return @from if ioapic_dynirq_base == 0.
2366 return ioapic_dynirq_base ? : from;
2369 #ifdef CONFIG_X86_32
2370 static int io_apic_get_unique_id(int ioapic, int apic_id)
2372 union IO_APIC_reg_00 reg_00;
2373 static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
2375 unsigned long flags;
2379 * The P4 platform supports up to 256 APIC IDs on two separate APIC
2380 * buses (one for LAPICs, one for IOAPICs), where predecessors only
2381 * supports up to 16 on one shared APIC bus.
2383 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
2384 * advantage of new APIC bus architecture.
2387 if (physids_empty(apic_id_map))
2388 apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);
2390 raw_spin_lock_irqsave(&ioapic_lock, flags);
2391 reg_00.raw = io_apic_read(ioapic, 0);
2392 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2394 if (apic_id >= get_physical_broadcast()) {
2395 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
2396 "%d\n", ioapic, apic_id, reg_00.bits.ID);
2397 apic_id = reg_00.bits.ID;
2401 * Every APIC in a system must have a unique ID or we get lots of nice
2402 * 'stuck on smp_invalidate_needed IPI wait' messages.
2404 if (apic->check_apicid_used(&apic_id_map, apic_id)) {
2406 for (i = 0; i < get_physical_broadcast(); i++) {
2407 if (!apic->check_apicid_used(&apic_id_map, i))
2411 if (i == get_physical_broadcast())
2412 panic("Max apic_id exceeded!\n");
2414 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
2415 "trying %d\n", ioapic, apic_id, i);
2420 apic->apicid_to_cpu_present(apic_id, &tmp);
2421 physids_or(apic_id_map, apic_id_map, tmp);
2423 if (reg_00.bits.ID != apic_id) {
2424 reg_00.bits.ID = apic_id;
2426 raw_spin_lock_irqsave(&ioapic_lock, flags);
2427 io_apic_write(ioapic, 0, reg_00.raw);
2428 reg_00.raw = io_apic_read(ioapic, 0);
2429 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2432 if (reg_00.bits.ID != apic_id) {
2433 pr_err("IOAPIC[%d]: Unable to change apic_id!\n",
2439 apic_printk(APIC_VERBOSE, KERN_INFO
2440 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
2445 static u8 io_apic_unique_id(int idx, u8 id)
2447 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
2448 !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
2449 return io_apic_get_unique_id(idx, id);
2454 static u8 io_apic_unique_id(int idx, u8 id)
2456 union IO_APIC_reg_00 reg_00;
2457 DECLARE_BITMAP(used, 256);
2458 unsigned long flags;
2462 bitmap_zero(used, 256);
2464 __set_bit(mpc_ioapic_id(i), used);
2466 /* Hand out the requested id if available */
2467 if (!test_bit(id, used))
2471 * Read the current id from the ioapic and keep it if
2474 raw_spin_lock_irqsave(&ioapic_lock, flags);
2475 reg_00.raw = io_apic_read(idx, 0);
2476 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2477 new_id = reg_00.bits.ID;
2478 if (!test_bit(new_id, used)) {
2479 apic_printk(APIC_VERBOSE, KERN_INFO
2480 "IOAPIC[%d]: Using reg apic_id %d instead of %d\n",
2486 * Get the next free id and write it to the ioapic.
2488 new_id = find_first_zero_bit(used, 256);
2489 reg_00.bits.ID = new_id;
2490 raw_spin_lock_irqsave(&ioapic_lock, flags);
2491 io_apic_write(idx, 0, reg_00.raw);
2492 reg_00.raw = io_apic_read(idx, 0);
2493 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2495 BUG_ON(reg_00.bits.ID != new_id);
2501 static int io_apic_get_version(int ioapic)
2503 union IO_APIC_reg_01 reg_01;
2504 unsigned long flags;
2506 raw_spin_lock_irqsave(&ioapic_lock, flags);
2507 reg_01.raw = io_apic_read(ioapic, 1);
2508 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
2510 return reg_01.bits.version;
2513 int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
2515 int ioapic, pin, idx;
2517 if (skip_ioapic_setup)
2520 ioapic = mp_find_ioapic(gsi);
2524 pin = mp_find_ioapic_pin(ioapic, gsi);
2528 idx = find_irq_entry(ioapic, pin, mp_INT);
2532 *trigger = irq_trigger(idx);
2533 *polarity = irq_polarity(idx);
2538 * This function currently is only a helper for the i386 smp boot process where
2539 * we need to reprogram the ioredtbls to cater for the cpus which have come online
2540 * so mask in all cases should simply be apic->target_cpus()
2543 void __init setup_ioapic_dest(void)
2545 int pin, ioapic, irq, irq_entry;
2546 const struct cpumask *mask;
2547 struct irq_desc *desc;
2548 struct irq_data *idata;
2549 struct irq_chip *chip;
2551 if (skip_ioapic_setup == 1)
2554 for_each_ioapic_pin(ioapic, pin) {
2555 irq_entry = find_irq_entry(ioapic, pin, mp_INT);
2556 if (irq_entry == -1)
2559 irq = pin_2_irq(irq_entry, ioapic, pin, 0);
2560 if (irq < 0 || !mp_init_irq_at_boot(ioapic, irq))
2563 desc = irq_to_desc(irq);
2564 raw_spin_lock_irq(&desc->lock);
2565 idata = irq_desc_get_irq_data(desc);
2568 * Honour affinities which have been set in early boot
2570 if (!irqd_can_balance(idata) || irqd_affinity_was_set(idata))
2571 mask = irq_data_get_affinity_mask(idata);
2573 mask = apic->target_cpus();
2575 chip = irq_data_get_irq_chip(idata);
2576 /* Might be lapic_chip for irq 0 */
2577 if (chip->irq_set_affinity)
2578 chip->irq_set_affinity(idata, mask, false);
2579 raw_spin_unlock_irq(&desc->lock);
2584 #define IOAPIC_RESOURCE_NAME_SIZE 11
2586 static struct resource *ioapic_resources;
2588 static struct resource * __init ioapic_setup_resources(void)
2591 struct resource *res;
2600 n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
2603 mem = alloc_bootmem(n);
2606 mem += sizeof(struct resource) * num;
2609 for_each_ioapic(i) {
2610 res[num].name = mem;
2611 res[num].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
2612 snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
2613 mem += IOAPIC_RESOURCE_NAME_SIZE;
2614 ioapics[i].iomem_res = &res[num];
2618 ioapic_resources = res;
2623 void __init io_apic_init_mappings(void)
2625 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
2626 struct resource *ioapic_res;
2629 ioapic_res = ioapic_setup_resources();
2630 for_each_ioapic(i) {
2631 if (smp_found_config) {
2632 ioapic_phys = mpc_ioapic_addr(i);
2633 #ifdef CONFIG_X86_32
2636 "WARNING: bogus zero IO-APIC "
2637 "address found in MPTABLE, "
2638 "disabling IO/APIC support!\n");
2639 smp_found_config = 0;
2640 skip_ioapic_setup = 1;
2641 goto fake_ioapic_page;
2645 #ifdef CONFIG_X86_32
2648 ioapic_phys = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
2649 ioapic_phys = __pa(ioapic_phys);
2651 set_fixmap_nocache(idx, ioapic_phys);
2652 apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n",
2653 __fix_to_virt(idx) + (ioapic_phys & ~PAGE_MASK),
2657 ioapic_res->start = ioapic_phys;
2658 ioapic_res->end = ioapic_phys + IO_APIC_SLOT_SIZE - 1;
2663 void __init ioapic_insert_resources(void)
2666 struct resource *r = ioapic_resources;
2671 "IO APIC resources couldn't be allocated.\n");
2675 for_each_ioapic(i) {
2676 insert_resource(&iomem_resource, r);
2681 int mp_find_ioapic(u32 gsi)
2685 if (nr_ioapics == 0)
2688 /* Find the IOAPIC that manages this GSI. */
2689 for_each_ioapic(i) {
2690 struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(i);
2691 if (gsi >= gsi_cfg->gsi_base && gsi <= gsi_cfg->gsi_end)
2695 printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
2699 int mp_find_ioapic_pin(int ioapic, u32 gsi)
2701 struct mp_ioapic_gsi *gsi_cfg;
2703 if (WARN_ON(ioapic < 0))
2706 gsi_cfg = mp_ioapic_gsi_routing(ioapic);
2707 if (WARN_ON(gsi > gsi_cfg->gsi_end))
2710 return gsi - gsi_cfg->gsi_base;
2713 static int bad_ioapic_register(int idx)
2715 union IO_APIC_reg_00 reg_00;
2716 union IO_APIC_reg_01 reg_01;
2717 union IO_APIC_reg_02 reg_02;
2719 reg_00.raw = io_apic_read(idx, 0);
2720 reg_01.raw = io_apic_read(idx, 1);
2721 reg_02.raw = io_apic_read(idx, 2);
2723 if (reg_00.raw == -1 && reg_01.raw == -1 && reg_02.raw == -1) {
2724 pr_warn("I/O APIC 0x%x registers return all ones, skipping!\n",
2725 mpc_ioapic_addr(idx));
2732 static int find_free_ioapic_entry(void)
2736 for (idx = 0; idx < MAX_IO_APICS; idx++)
2737 if (ioapics[idx].nr_registers == 0)
2740 return MAX_IO_APICS;
2744 * mp_register_ioapic - Register an IOAPIC device
2745 * @id: hardware IOAPIC ID
2746 * @address: physical address of IOAPIC register area
2747 * @gsi_base: base of GSI associated with the IOAPIC
2748 * @cfg: configuration information for the IOAPIC
2750 int mp_register_ioapic(int id, u32 address, u32 gsi_base,
2751 struct ioapic_domain_cfg *cfg)
2753 bool hotplug = !!ioapic_initialized;
2754 struct mp_ioapic_gsi *gsi_cfg;
2755 int idx, ioapic, entries;
2759 pr_warn("Bogus (zero) I/O APIC address found, skipping!\n");
2762 for_each_ioapic(ioapic)
2763 if (ioapics[ioapic].mp_config.apicaddr == address) {
2764 pr_warn("address 0x%x conflicts with IOAPIC%d\n",
2769 idx = find_free_ioapic_entry();
2770 if (idx >= MAX_IO_APICS) {
2771 pr_warn("Max # of I/O APICs (%d) exceeded (found %d), skipping\n",
2776 ioapics[idx].mp_config.type = MP_IOAPIC;
2777 ioapics[idx].mp_config.flags = MPC_APIC_USABLE;
2778 ioapics[idx].mp_config.apicaddr = address;
2780 set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
2781 if (bad_ioapic_register(idx)) {
2782 clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
2786 ioapics[idx].mp_config.apicid = io_apic_unique_id(idx, id);
2787 ioapics[idx].mp_config.apicver = io_apic_get_version(idx);
2790 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
2791 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
2793 entries = io_apic_get_redir_entries(idx);
2794 gsi_end = gsi_base + entries - 1;
2795 for_each_ioapic(ioapic) {
2796 gsi_cfg = mp_ioapic_gsi_routing(ioapic);
2797 if ((gsi_base >= gsi_cfg->gsi_base &&
2798 gsi_base <= gsi_cfg->gsi_end) ||
2799 (gsi_end >= gsi_cfg->gsi_base &&
2800 gsi_end <= gsi_cfg->gsi_end)) {
2801 pr_warn("GSI range [%u-%u] for new IOAPIC conflicts with GSI[%u-%u]\n",
2803 gsi_cfg->gsi_base, gsi_cfg->gsi_end);
2804 clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
2808 gsi_cfg = mp_ioapic_gsi_routing(idx);
2809 gsi_cfg->gsi_base = gsi_base;
2810 gsi_cfg->gsi_end = gsi_end;
2812 ioapics[idx].irqdomain = NULL;
2813 ioapics[idx].irqdomain_cfg = *cfg;
2816 * If mp_register_ioapic() is called during early boot stage when
2817 * walking ACPI/SFI/DT tables, it's too early to create irqdomain,
2818 * we are still using bootmem allocator. So delay it to setup_IO_APIC().
2821 if (mp_irqdomain_create(idx)) {
2822 clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
2825 alloc_ioapic_saved_registers(idx);
2828 if (gsi_cfg->gsi_end >= gsi_top)
2829 gsi_top = gsi_cfg->gsi_end + 1;
2830 if (nr_ioapics <= idx)
2831 nr_ioapics = idx + 1;
2833 /* Set nr_registers to mark entry present */
2834 ioapics[idx].nr_registers = entries;
2836 pr_info("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, GSI %d-%d\n",
2837 idx, mpc_ioapic_id(idx),
2838 mpc_ioapic_ver(idx), mpc_ioapic_addr(idx),
2839 gsi_cfg->gsi_base, gsi_cfg->gsi_end);
2844 int mp_unregister_ioapic(u32 gsi_base)
2849 for_each_ioapic(ioapic)
2850 if (ioapics[ioapic].gsi_config.gsi_base == gsi_base) {
2855 pr_warn("can't find IOAPIC for GSI %d\n", gsi_base);
2859 for_each_pin(ioapic, pin) {
2860 u32 gsi = mp_pin_to_gsi(ioapic, pin);
2861 int irq = mp_map_gsi_to_irq(gsi, 0, NULL);
2862 struct mp_chip_data *data;
2865 data = irq_get_chip_data(irq);
2866 if (data && data->count) {
2867 pr_warn("pin%d on IOAPIC%d is still in use.\n",
2874 /* Mark entry not present */
2875 ioapics[ioapic].nr_registers = 0;
2876 ioapic_destroy_irqdomain(ioapic);
2877 free_ioapic_saved_registers(ioapic);
2878 if (ioapics[ioapic].iomem_res)
2879 release_resource(ioapics[ioapic].iomem_res);
2880 clear_fixmap(FIX_IO_APIC_BASE_0 + ioapic);
2881 memset(&ioapics[ioapic], 0, sizeof(ioapics[ioapic]));
2886 int mp_ioapic_registered(u32 gsi_base)
2890 for_each_ioapic(ioapic)
2891 if (ioapics[ioapic].gsi_config.gsi_base == gsi_base)
2897 static void mp_irqdomain_get_attr(u32 gsi, struct mp_chip_data *data,
2898 struct irq_alloc_info *info)
2900 if (info && info->ioapic_valid) {
2901 data->trigger = info->ioapic_trigger;
2902 data->polarity = info->ioapic_polarity;
2903 } else if (acpi_get_override_irq(gsi, &data->trigger,
2904 &data->polarity) < 0) {
2905 /* PCI interrupts are always active low level triggered. */
2906 data->trigger = IOAPIC_LEVEL;
2907 data->polarity = IOAPIC_POL_LOW;
2911 static void mp_setup_entry(struct irq_cfg *cfg, struct mp_chip_data *data,
2912 struct IO_APIC_route_entry *entry)
2914 memset(entry, 0, sizeof(*entry));
2915 entry->delivery_mode = apic->irq_delivery_mode;
2916 entry->dest_mode = apic->irq_dest_mode;
2917 entry->dest = cfg->dest_apicid;
2918 entry->vector = cfg->vector;
2919 entry->trigger = data->trigger;
2920 entry->polarity = data->polarity;
2922 * Mask level triggered irqs. Edge triggered irqs are masked
2923 * by the irq core code in case they fire.
2925 if (data->trigger == IOAPIC_LEVEL)
2926 entry->mask = IOAPIC_MASKED;
2928 entry->mask = IOAPIC_UNMASKED;
2931 int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
2932 unsigned int nr_irqs, void *arg)
2934 int ret, ioapic, pin;
2935 struct irq_cfg *cfg;
2936 struct irq_data *irq_data;
2937 struct mp_chip_data *data;
2938 struct irq_alloc_info *info = arg;
2939 unsigned long flags;
2941 if (!info || nr_irqs > 1)
2943 irq_data = irq_domain_get_irq_data(domain, virq);
2947 ioapic = mp_irqdomain_ioapic_idx(domain);
2948 pin = info->ioapic_pin;
2949 if (irq_find_mapping(domain, (irq_hw_number_t)pin) > 0)
2952 data = kzalloc(sizeof(*data), GFP_KERNEL);
2956 info->ioapic_entry = &data->entry;
2957 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, info);
2963 INIT_LIST_HEAD(&data->irq_2_pin);
2964 irq_data->hwirq = info->ioapic_pin;
2965 irq_data->chip = (domain->parent == x86_vector_domain) ?
2966 &ioapic_chip : &ioapic_ir_chip;
2967 irq_data->chip_data = data;
2968 mp_irqdomain_get_attr(mp_pin_to_gsi(ioapic, pin), data, info);
2970 cfg = irqd_cfg(irq_data);
2971 add_pin_to_irq_node(data, ioapic_alloc_attr_node(info), ioapic, pin);
2973 local_irq_save(flags);
2974 if (info->ioapic_entry)
2975 mp_setup_entry(cfg, data, info->ioapic_entry);
2976 mp_register_handler(virq, data->trigger);
2977 if (virq < nr_legacy_irqs())
2978 legacy_pic->mask(virq);
2979 local_irq_restore(flags);
2981 apic_printk(APIC_VERBOSE, KERN_DEBUG
2982 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i Dest:%d)\n",
2983 ioapic, mpc_ioapic_id(ioapic), pin, cfg->vector,
2984 virq, data->trigger, data->polarity, cfg->dest_apicid);
2989 void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq,
2990 unsigned int nr_irqs)
2992 struct irq_data *irq_data;
2993 struct mp_chip_data *data;
2995 BUG_ON(nr_irqs != 1);
2996 irq_data = irq_domain_get_irq_data(domain, virq);
2997 if (irq_data && irq_data->chip_data) {
2998 data = irq_data->chip_data;
2999 __remove_pin_from_irq(data, mp_irqdomain_ioapic_idx(domain),
3000 (int)irq_data->hwirq);
3001 WARN_ON(!list_empty(&data->irq_2_pin));
3002 kfree(irq_data->chip_data);
3004 irq_domain_free_irqs_top(domain, virq, nr_irqs);
3007 void mp_irqdomain_activate(struct irq_domain *domain,
3008 struct irq_data *irq_data)
3010 unsigned long flags;
3011 struct irq_pin_list *entry;
3012 struct mp_chip_data *data = irq_data->chip_data;
3014 raw_spin_lock_irqsave(&ioapic_lock, flags);
3015 for_each_irq_pin(entry, data->irq_2_pin)
3016 __ioapic_write_entry(entry->apic, entry->pin, data->entry);
3017 raw_spin_unlock_irqrestore(&ioapic_lock, flags);
3020 void mp_irqdomain_deactivate(struct irq_domain *domain,
3021 struct irq_data *irq_data)
3023 /* It won't be called for IRQ with multiple IOAPIC pins associated */
3024 ioapic_mask_entry(mp_irqdomain_ioapic_idx(domain),
3025 (int)irq_data->hwirq);
3028 int mp_irqdomain_ioapic_idx(struct irq_domain *domain)
3030 return (int)(long)domain->host_data;
3033 const struct irq_domain_ops mp_ioapic_irqdomain_ops = {
3034 .alloc = mp_irqdomain_alloc,
3035 .free = mp_irqdomain_free,
3036 .activate = mp_irqdomain_activate,
3037 .deactivate = mp_irqdomain_deactivate,