2 * Intel IO-APIC support for multi-Pentium hosts.
4 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
6 * Many thanks to Stig Venaas for trying out countless experimental
7 * patches and reporting/debugging problems patiently!
9 * (c) 1999, Multiple IO-APIC support, developed by
10 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
11 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
12 * further tested and cleaned up by Zach Brown <zab@redhat.com>
13 * and Ingo Molnar <mingo@redhat.com>
16 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
17 * thanks to Eric Gilmore
19 * for testing these extensively
20 * Paul Diefenbaugh : Added full ACPI support
24 #include <linux/interrupt.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/sched.h>
28 #include <linux/bootmem.h>
29 #include <linux/mc146818rtc.h>
30 #include <linux/compiler.h>
31 #include <linux/acpi.h>
32 #include <linux/module.h>
33 #include <linux/sysdev.h>
34 #include <linux/pci.h>
35 #include <linux/msi.h>
36 #include <linux/htirq.h>
37 #include <linux/freezer.h>
38 #include <linux/kthread.h>
39 #include <linux/jiffies.h> /* time_after() */
44 #include <asm/timer.h>
45 #include <asm/i8259.h>
47 #include <asm/msidef.h>
48 #include <asm/hypertransport.h>
50 #include <mach_apic.h>
51 #include <mach_apicdef.h>
53 int (*ioapic_renumber_irq)(int ioapic, int irq);
54 atomic_t irq_mis_count;
56 /* Where if anywhere is the i8259 connect in external int mode */
57 static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
59 static DEFINE_SPINLOCK(ioapic_lock);
60 static DEFINE_SPINLOCK(vector_lock);
62 int timer_through_8259 __initdata;
65 * Is the SiS APIC rmw bug present ?
66 * -1 = don't know, 0 = no, 1 = yes
68 int sis_apic_bug = -1;
71 * # of IRQ routing registers
73 int nr_ioapic_registers[MAX_IO_APICS];
75 /* I/O APIC entries */
76 struct mp_config_ioapic mp_ioapics[MAX_IO_APICS];
79 /* MP IRQ source entries */
80 struct mp_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
82 /* # of MP IRQ source entries */
85 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
86 int mp_bus_id_to_type[MAX_MP_BUSSES];
89 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
91 static int disable_timer_pin_1 __initdata;
94 * Rough estimation of how many shared IRQs there are, can
97 #define MAX_PLUS_SHARED_IRQS NR_IRQS
98 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
101 * This is performance-critical, we want to do it O(1)
103 * the indexing order of this array favors 1:1 mappings
104 * between pins and IRQs.
107 static struct irq_pin_list {
109 } irq_2_pin[PIN_MAP_SIZE];
113 unsigned int unused[3];
117 static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
119 return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
120 + (mp_ioapics[idx].mp_apicaddr & ~PAGE_MASK);
123 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
125 struct io_apic __iomem *io_apic = io_apic_base(apic);
126 writel(reg, &io_apic->index);
127 return readl(&io_apic->data);
130 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
132 struct io_apic __iomem *io_apic = io_apic_base(apic);
133 writel(reg, &io_apic->index);
134 writel(value, &io_apic->data);
138 * Re-write a value: to be used for read-modify-write
139 * cycles where the read already set up the index register.
141 * Older SiS APIC requires we rewrite the index register
143 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
145 volatile struct io_apic __iomem *io_apic = io_apic_base(apic);
147 writel(reg, &io_apic->index);
148 writel(value, &io_apic->data);
152 struct { u32 w1, w2; };
153 struct IO_APIC_route_entry entry;
156 static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
158 union entry_union eu;
160 spin_lock_irqsave(&ioapic_lock, flags);
161 eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
162 eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
163 spin_unlock_irqrestore(&ioapic_lock, flags);
168 * When we write a new IO APIC routing entry, we need to write the high
169 * word first! If the mask bit in the low word is clear, we will enable
170 * the interrupt, and we need to make sure the entry is fully populated
171 * before that happens.
174 __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
176 union entry_union eu;
178 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
179 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
182 static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
185 spin_lock_irqsave(&ioapic_lock, flags);
186 __ioapic_write_entry(apic, pin, e);
187 spin_unlock_irqrestore(&ioapic_lock, flags);
191 * When we mask an IO APIC routing entry, we need to write the low
192 * word first, in order to set the mask bit before we change the
195 static void ioapic_mask_entry(int apic, int pin)
198 union entry_union eu = { .entry.mask = 1 };
200 spin_lock_irqsave(&ioapic_lock, flags);
201 io_apic_write(apic, 0x10 + 2*pin, eu.w1);
202 io_apic_write(apic, 0x11 + 2*pin, eu.w2);
203 spin_unlock_irqrestore(&ioapic_lock, flags);
207 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
208 * shared ISA-space IRQs, so we have to support them. We are super
209 * fast in the common case, and fast for shared ISA-space IRQs.
211 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
213 static int first_free_entry = NR_IRQS;
214 struct irq_pin_list *entry = irq_2_pin + irq;
217 entry = irq_2_pin + entry->next;
219 if (entry->pin != -1) {
220 entry->next = first_free_entry;
221 entry = irq_2_pin + entry->next;
222 if (++first_free_entry >= PIN_MAP_SIZE)
223 panic("io_apic.c: whoops");
230 * Reroute an IRQ to a different pin.
232 static void __init replace_pin_at_irq(unsigned int irq,
233 int oldapic, int oldpin,
234 int newapic, int newpin)
236 struct irq_pin_list *entry = irq_2_pin + irq;
239 if (entry->apic == oldapic && entry->pin == oldpin) {
240 entry->apic = newapic;
245 entry = irq_2_pin + entry->next;
249 static void __modify_IO_APIC_irq(unsigned int irq, unsigned long enable, unsigned long disable)
251 struct irq_pin_list *entry = irq_2_pin + irq;
252 unsigned int pin, reg;
258 reg = io_apic_read(entry->apic, 0x10 + pin*2);
261 io_apic_modify(entry->apic, 0x10 + pin*2, reg);
264 entry = irq_2_pin + entry->next;
269 static void __mask_IO_APIC_irq(unsigned int irq)
271 __modify_IO_APIC_irq(irq, IO_APIC_REDIR_MASKED, 0);
275 static void __unmask_IO_APIC_irq(unsigned int irq)
277 __modify_IO_APIC_irq(irq, 0, IO_APIC_REDIR_MASKED);
280 /* mask = 1, trigger = 0 */
281 static void __mask_and_edge_IO_APIC_irq(unsigned int irq)
283 __modify_IO_APIC_irq(irq, IO_APIC_REDIR_MASKED,
284 IO_APIC_REDIR_LEVEL_TRIGGER);
287 /* mask = 0, trigger = 1 */
288 static void __unmask_and_level_IO_APIC_irq(unsigned int irq)
290 __modify_IO_APIC_irq(irq, IO_APIC_REDIR_LEVEL_TRIGGER,
291 IO_APIC_REDIR_MASKED);
294 static void mask_IO_APIC_irq(unsigned int irq)
298 spin_lock_irqsave(&ioapic_lock, flags);
299 __mask_IO_APIC_irq(irq);
300 spin_unlock_irqrestore(&ioapic_lock, flags);
303 static void unmask_IO_APIC_irq(unsigned int irq)
307 spin_lock_irqsave(&ioapic_lock, flags);
308 __unmask_IO_APIC_irq(irq);
309 spin_unlock_irqrestore(&ioapic_lock, flags);
312 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
314 struct IO_APIC_route_entry entry;
316 /* Check delivery_mode to be sure we're not clearing an SMI pin */
317 entry = ioapic_read_entry(apic, pin);
318 if (entry.delivery_mode == dest_SMI)
322 * Disable it in the IO-APIC irq-routing table:
324 ioapic_mask_entry(apic, pin);
327 static void clear_IO_APIC(void)
331 for (apic = 0; apic < nr_ioapics; apic++)
332 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
333 clear_IO_APIC_pin(apic, pin);
337 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
341 struct irq_pin_list *entry = irq_2_pin + irq;
342 unsigned int apicid_value;
345 cpus_and(tmp, cpumask, cpu_online_map);
349 cpus_and(cpumask, tmp, CPU_MASK_ALL);
351 apicid_value = cpu_mask_to_apicid(cpumask);
352 /* Prepare to do the io_apic_write */
353 apicid_value = apicid_value << 24;
354 spin_lock_irqsave(&ioapic_lock, flags);
359 io_apic_write(entry->apic, 0x10 + 1 + pin*2, apicid_value);
362 entry = irq_2_pin + entry->next;
364 irq_desc[irq].affinity = cpumask;
365 spin_unlock_irqrestore(&ioapic_lock, flags);
368 #if defined(CONFIG_IRQBALANCE)
369 # include <asm/processor.h> /* kernel_thread() */
370 # include <linux/kernel_stat.h> /* kstat */
371 # include <linux/slab.h> /* kmalloc() */
372 # include <linux/timer.h>
374 #define IRQBALANCE_CHECK_ARCH -999
375 #define MAX_BALANCED_IRQ_INTERVAL (5*HZ)
376 #define MIN_BALANCED_IRQ_INTERVAL (HZ/2)
377 #define BALANCED_IRQ_MORE_DELTA (HZ/10)
378 #define BALANCED_IRQ_LESS_DELTA (HZ)
380 static int irqbalance_disabled __read_mostly = IRQBALANCE_CHECK_ARCH;
381 static int physical_balance __read_mostly;
382 static long balanced_irq_interval __read_mostly = MAX_BALANCED_IRQ_INTERVAL;
384 static struct irq_cpu_info {
385 unsigned long *last_irq;
386 unsigned long *irq_delta;
388 } irq_cpu_data[NR_CPUS];
390 #define CPU_IRQ(cpu) (irq_cpu_data[cpu].irq)
391 #define LAST_CPU_IRQ(cpu, irq) (irq_cpu_data[cpu].last_irq[irq])
392 #define IRQ_DELTA(cpu, irq) (irq_cpu_data[cpu].irq_delta[irq])
394 #define IDLE_ENOUGH(cpu,now) \
395 (idle_cpu(cpu) && ((now) - per_cpu(irq_stat, (cpu)).idle_timestamp > 1))
397 #define IRQ_ALLOWED(cpu, allowed_mask) cpu_isset(cpu, allowed_mask)
399 #define CPU_TO_PACKAGEINDEX(i) (first_cpu(per_cpu(cpu_sibling_map, i)))
401 static cpumask_t balance_irq_affinity[NR_IRQS] = {
402 [0 ... NR_IRQS-1] = CPU_MASK_ALL
405 void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
407 balance_irq_affinity[irq] = mask;
410 static unsigned long move(int curr_cpu, cpumask_t allowed_mask,
411 unsigned long now, int direction)
419 if (unlikely(cpu == curr_cpu))
422 if (direction == 1) {
431 } while (!cpu_online(cpu) || !IRQ_ALLOWED(cpu, allowed_mask) ||
432 (search_idle && !IDLE_ENOUGH(cpu, now)));
437 static inline void balance_irq(int cpu, int irq)
439 unsigned long now = jiffies;
440 cpumask_t allowed_mask;
441 unsigned int new_cpu;
443 if (irqbalance_disabled)
446 cpus_and(allowed_mask, cpu_online_map, balance_irq_affinity[irq]);
447 new_cpu = move(cpu, allowed_mask, now, 1);
449 set_pending_irq(irq, cpumask_of_cpu(new_cpu));
452 static inline void rotate_irqs_among_cpus(unsigned long useful_load_threshold)
456 for_each_online_cpu(i) {
457 for (j = 0; j < NR_IRQS; j++) {
458 if (!irq_desc[j].action)
460 /* Is it a significant load ? */
461 if (IRQ_DELTA(CPU_TO_PACKAGEINDEX(i), j) <
462 useful_load_threshold)
467 balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
468 balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
472 static void do_irq_balance(void)
475 unsigned long max_cpu_irq = 0, min_cpu_irq = (~0);
476 unsigned long move_this_load = 0;
477 int max_loaded = 0, min_loaded = 0;
479 unsigned long useful_load_threshold = balanced_irq_interval + 10;
481 int tmp_loaded, first_attempt = 1;
482 unsigned long tmp_cpu_irq;
483 unsigned long imbalance = 0;
484 cpumask_t allowed_mask, target_cpu_mask, tmp;
486 for_each_possible_cpu(i) {
491 package_index = CPU_TO_PACKAGEINDEX(i);
492 for (j = 0; j < NR_IRQS; j++) {
493 unsigned long value_now, delta;
494 /* Is this an active IRQ or balancing disabled ? */
495 if (!irq_desc[j].action || irq_balancing_disabled(j))
497 if (package_index == i)
498 IRQ_DELTA(package_index, j) = 0;
499 /* Determine the total count per processor per IRQ */
500 value_now = (unsigned long) kstat_cpu(i).irqs[j];
502 /* Determine the activity per processor per IRQ */
503 delta = value_now - LAST_CPU_IRQ(i, j);
505 /* Update last_cpu_irq[][] for the next time */
506 LAST_CPU_IRQ(i, j) = value_now;
508 /* Ignore IRQs whose rate is less than the clock */
509 if (delta < useful_load_threshold)
511 /* update the load for the processor or package total */
512 IRQ_DELTA(package_index, j) += delta;
514 /* Keep track of the higher numbered sibling as well */
515 if (i != package_index)
518 * We have sibling A and sibling B in the package
520 * cpu_irq[A] = load for cpu A + load for cpu B
521 * cpu_irq[B] = load for cpu B
523 CPU_IRQ(package_index) += delta;
526 /* Find the least loaded processor package */
527 for_each_online_cpu(i) {
528 if (i != CPU_TO_PACKAGEINDEX(i))
530 if (min_cpu_irq > CPU_IRQ(i)) {
531 min_cpu_irq = CPU_IRQ(i);
535 max_cpu_irq = ULONG_MAX;
539 * Look for heaviest loaded processor.
540 * We may come back to get the next heaviest loaded processor.
541 * Skip processors with trivial loads.
545 for_each_online_cpu(i) {
546 if (i != CPU_TO_PACKAGEINDEX(i))
548 if (max_cpu_irq <= CPU_IRQ(i))
550 if (tmp_cpu_irq < CPU_IRQ(i)) {
551 tmp_cpu_irq = CPU_IRQ(i);
556 if (tmp_loaded == -1) {
558 * In the case of small number of heavy interrupt sources,
559 * loading some of the cpus too much. We use Ingo's original
560 * approach to rotate them around.
562 if (!first_attempt && imbalance >= useful_load_threshold) {
563 rotate_irqs_among_cpus(useful_load_threshold);
566 goto not_worth_the_effort;
569 first_attempt = 0; /* heaviest search */
570 max_cpu_irq = tmp_cpu_irq; /* load */
571 max_loaded = tmp_loaded; /* processor */
572 imbalance = (max_cpu_irq - min_cpu_irq) / 2;
575 * if imbalance is less than approx 10% of max load, then
576 * observe diminishing returns action. - quit
578 if (imbalance < (max_cpu_irq >> 3))
579 goto not_worth_the_effort;
582 /* if we select an IRQ to move that can't go where we want, then
583 * see if there is another one to try.
587 for (j = 0; j < NR_IRQS; j++) {
588 /* Is this an active IRQ? */
589 if (!irq_desc[j].action)
591 if (imbalance <= IRQ_DELTA(max_loaded, j))
593 /* Try to find the IRQ that is closest to the imbalance
594 * without going over.
596 if (move_this_load < IRQ_DELTA(max_loaded, j)) {
597 move_this_load = IRQ_DELTA(max_loaded, j);
601 if (selected_irq == -1)
604 imbalance = move_this_load;
606 /* For physical_balance case, we accumulated both load
607 * values in the one of the siblings cpu_irq[],
608 * to use the same code for physical and logical processors
609 * as much as possible.
611 * NOTE: the cpu_irq[] array holds the sum of the load for
612 * sibling A and sibling B in the slot for the lowest numbered
613 * sibling (A), _AND_ the load for sibling B in the slot for
614 * the higher numbered sibling.
616 * We seek the least loaded sibling by making the comparison
619 load = CPU_IRQ(min_loaded) >> 1;
620 for_each_cpu_mask(j, per_cpu(cpu_sibling_map, min_loaded)) {
621 if (load > CPU_IRQ(j)) {
622 /* This won't change cpu_sibling_map[min_loaded] */
628 cpus_and(allowed_mask,
630 balance_irq_affinity[selected_irq]);
631 target_cpu_mask = cpumask_of_cpu(min_loaded);
632 cpus_and(tmp, target_cpu_mask, allowed_mask);
634 if (!cpus_empty(tmp)) {
635 /* mark for change destination */
636 set_pending_irq(selected_irq, cpumask_of_cpu(min_loaded));
638 /* Since we made a change, come back sooner to
639 * check for more variation.
641 balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
642 balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
647 not_worth_the_effort:
649 * if we did not find an IRQ to move, then adjust the time interval
652 balanced_irq_interval = min((long)MAX_BALANCED_IRQ_INTERVAL,
653 balanced_irq_interval + BALANCED_IRQ_MORE_DELTA);
657 static int balanced_irq(void *unused)
660 unsigned long prev_balance_time = jiffies;
661 long time_remaining = balanced_irq_interval;
663 /* push everything to CPU 0 to give us a starting point. */
664 for (i = 0 ; i < NR_IRQS ; i++) {
665 irq_desc[i].pending_mask = cpumask_of_cpu(0);
666 set_pending_irq(i, cpumask_of_cpu(0));
671 time_remaining = schedule_timeout_interruptible(time_remaining);
673 if (time_after(jiffies,
674 prev_balance_time+balanced_irq_interval)) {
677 prev_balance_time = jiffies;
678 time_remaining = balanced_irq_interval;
685 static int __init balanced_irq_init(void)
688 struct cpuinfo_x86 *c;
691 cpus_shift_right(tmp, cpu_online_map, 2);
693 /* When not overwritten by the command line ask subarchitecture. */
694 if (irqbalance_disabled == IRQBALANCE_CHECK_ARCH)
695 irqbalance_disabled = NO_BALANCE_IRQ;
696 if (irqbalance_disabled)
699 /* disable irqbalance completely if there is only one processor online */
700 if (num_online_cpus() < 2) {
701 irqbalance_disabled = 1;
705 * Enable physical balance only if more than 1 physical processor
708 if (smp_num_siblings > 1 && !cpus_empty(tmp))
709 physical_balance = 1;
711 for_each_online_cpu(i) {
712 irq_cpu_data[i].irq_delta = kzalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
713 irq_cpu_data[i].last_irq = kzalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
714 if (irq_cpu_data[i].irq_delta == NULL || irq_cpu_data[i].last_irq == NULL) {
715 printk(KERN_ERR "balanced_irq_init: out of memory");
720 printk(KERN_INFO "Starting balanced_irq\n");
721 if (!IS_ERR(kthread_run(balanced_irq, NULL, "kirqd")))
723 printk(KERN_ERR "balanced_irq_init: failed to spawn balanced_irq");
725 for_each_possible_cpu(i) {
726 kfree(irq_cpu_data[i].irq_delta);
727 irq_cpu_data[i].irq_delta = NULL;
728 kfree(irq_cpu_data[i].last_irq);
729 irq_cpu_data[i].last_irq = NULL;
734 int __devinit irqbalance_disable(char *str)
736 irqbalance_disabled = 1;
740 __setup("noirqbalance", irqbalance_disable);
742 late_initcall(balanced_irq_init);
743 #endif /* CONFIG_IRQBALANCE */
744 #endif /* CONFIG_SMP */
747 void send_IPI_self(int vector)
754 apic_wait_icr_idle();
755 cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL;
757 * Send the IPI. The write to APIC_ICR fires this off.
759 apic_write_around(APIC_ICR, cfg);
761 #endif /* !CONFIG_SMP */
765 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
766 * specific CPU-side IRQs.
770 static int pirq_entries [MAX_PIRQS];
771 static int pirqs_enabled;
772 int skip_ioapic_setup;
774 static int __init ioapic_pirq_setup(char *str)
777 int ints[MAX_PIRQS+1];
779 get_options(str, ARRAY_SIZE(ints), ints);
781 for (i = 0; i < MAX_PIRQS; i++)
782 pirq_entries[i] = -1;
785 apic_printk(APIC_VERBOSE, KERN_INFO
786 "PIRQ redirection, working around broken MP-BIOS.\n");
788 if (ints[0] < MAX_PIRQS)
791 for (i = 0; i < max; i++) {
792 apic_printk(APIC_VERBOSE, KERN_DEBUG
793 "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
795 * PIRQs are mapped upside down, usually.
797 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
802 __setup("pirq=", ioapic_pirq_setup);
805 * Find the IRQ entry number of a certain pin.
807 static int find_irq_entry(int apic, int pin, int type)
811 for (i = 0; i < mp_irq_entries; i++)
812 if (mp_irqs[i].mp_irqtype == type &&
813 (mp_irqs[i].mp_dstapic == mp_ioapics[apic].mp_apicid ||
814 mp_irqs[i].mp_dstapic == MP_APIC_ALL) &&
815 mp_irqs[i].mp_dstirq == pin)
822 * Find the pin to which IRQ[irq] (ISA) is connected
824 static int __init find_isa_irq_pin(int irq, int type)
828 for (i = 0; i < mp_irq_entries; i++) {
829 int lbus = mp_irqs[i].mp_srcbus;
831 if (test_bit(lbus, mp_bus_not_pci) &&
832 (mp_irqs[i].mp_irqtype == type) &&
833 (mp_irqs[i].mp_srcbusirq == irq))
835 return mp_irqs[i].mp_dstirq;
840 static int __init find_isa_irq_apic(int irq, int type)
844 for (i = 0; i < mp_irq_entries; i++) {
845 int lbus = mp_irqs[i].mp_srcbus;
847 if (test_bit(lbus, mp_bus_not_pci) &&
848 (mp_irqs[i].mp_irqtype == type) &&
849 (mp_irqs[i].mp_srcbusirq == irq))
852 if (i < mp_irq_entries) {
854 for (apic = 0; apic < nr_ioapics; apic++) {
855 if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic)
864 * Find a specific PCI IRQ entry.
865 * Not an __init, possibly needed by modules
867 static int pin_2_irq(int idx, int apic, int pin);
869 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
871 int apic, i, best_guess = -1;
873 apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, "
874 "slot:%d, pin:%d.\n", bus, slot, pin);
875 if (test_bit(bus, mp_bus_not_pci)) {
876 printk(KERN_WARNING "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
879 for (i = 0; i < mp_irq_entries; i++) {
880 int lbus = mp_irqs[i].mp_srcbus;
882 for (apic = 0; apic < nr_ioapics; apic++)
883 if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic ||
884 mp_irqs[i].mp_dstapic == MP_APIC_ALL)
887 if (!test_bit(lbus, mp_bus_not_pci) &&
888 !mp_irqs[i].mp_irqtype &&
890 (slot == ((mp_irqs[i].mp_srcbusirq >> 2) & 0x1f))) {
891 int irq = pin_2_irq(i, apic, mp_irqs[i].mp_dstirq);
893 if (!(apic || IO_APIC_IRQ(irq)))
896 if (pin == (mp_irqs[i].mp_srcbusirq & 3))
899 * Use the first all-but-pin matching entry as a
900 * best-guess fuzzy result for broken mptables.
908 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
911 * This function currently is only a helper for the i386 smp boot process where
912 * we need to reprogram the ioredtbls to cater for the cpus which have come online
913 * so mask in all cases should simply be TARGET_CPUS
916 void __init setup_ioapic_dest(void)
918 int pin, ioapic, irq, irq_entry;
920 if (skip_ioapic_setup == 1)
923 for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
924 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
925 irq_entry = find_irq_entry(ioapic, pin, mp_INT);
928 irq = pin_2_irq(irq_entry, ioapic, pin);
929 set_ioapic_affinity_irq(irq, TARGET_CPUS);
936 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
938 * EISA Edge/Level control register, ELCR
940 static int EISA_ELCR(unsigned int irq)
943 unsigned int port = 0x4d0 + (irq >> 3);
944 return (inb(port) >> (irq & 7)) & 1;
946 apic_printk(APIC_VERBOSE, KERN_INFO
947 "Broken MPtable reports ISA irq %d\n", irq);
952 /* ISA interrupts are always polarity zero edge triggered,
953 * when listed as conforming in the MP table. */
955 #define default_ISA_trigger(idx) (0)
956 #define default_ISA_polarity(idx) (0)
958 /* EISA interrupts are always polarity zero and can be edge or level
959 * trigger depending on the ELCR value. If an interrupt is listed as
960 * EISA conforming in the MP table, that means its trigger type must
961 * be read in from the ELCR */
963 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].mp_srcbusirq))
964 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
966 /* PCI interrupts are always polarity one level triggered,
967 * when listed as conforming in the MP table. */
969 #define default_PCI_trigger(idx) (1)
970 #define default_PCI_polarity(idx) (1)
972 /* MCA interrupts are always polarity zero level triggered,
973 * when listed as conforming in the MP table. */
975 #define default_MCA_trigger(idx) (1)
976 #define default_MCA_polarity(idx) default_ISA_polarity(idx)
978 static int MPBIOS_polarity(int idx)
980 int bus = mp_irqs[idx].mp_srcbus;
984 * Determine IRQ line polarity (high active or low active):
986 switch (mp_irqs[idx].mp_irqflag & 3) {
987 case 0: /* conforms, ie. bus-type dependent polarity */
989 polarity = test_bit(bus, mp_bus_not_pci)?
990 default_ISA_polarity(idx):
991 default_PCI_polarity(idx);
994 case 1: /* high active */
999 case 2: /* reserved */
1001 printk(KERN_WARNING "broken BIOS!!\n");
1005 case 3: /* low active */
1010 default: /* invalid */
1012 printk(KERN_WARNING "broken BIOS!!\n");
1020 static int MPBIOS_trigger(int idx)
1022 int bus = mp_irqs[idx].mp_srcbus;
1026 * Determine IRQ trigger mode (edge or level sensitive):
1028 switch ((mp_irqs[idx].mp_irqflag>>2) & 3) {
1029 case 0: /* conforms, ie. bus-type dependent */
1031 trigger = test_bit(bus, mp_bus_not_pci)?
1032 default_ISA_trigger(idx):
1033 default_PCI_trigger(idx);
1034 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
1035 switch (mp_bus_id_to_type[bus]) {
1036 case MP_BUS_ISA: /* ISA pin */
1038 /* set before the switch */
1041 case MP_BUS_EISA: /* EISA pin */
1043 trigger = default_EISA_trigger(idx);
1046 case MP_BUS_PCI: /* PCI pin */
1048 /* set before the switch */
1051 case MP_BUS_MCA: /* MCA pin */
1053 trigger = default_MCA_trigger(idx);
1058 printk(KERN_WARNING "broken BIOS!!\n");
1071 case 2: /* reserved */
1073 printk(KERN_WARNING "broken BIOS!!\n");
1082 default: /* invalid */
1084 printk(KERN_WARNING "broken BIOS!!\n");
1092 static inline int irq_polarity(int idx)
1094 return MPBIOS_polarity(idx);
1097 static inline int irq_trigger(int idx)
1099 return MPBIOS_trigger(idx);
1102 static int pin_2_irq(int idx, int apic, int pin)
1105 int bus = mp_irqs[idx].mp_srcbus;
1108 * Debugging check, we are in big trouble if this message pops up!
1110 if (mp_irqs[idx].mp_dstirq != pin)
1111 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
1113 if (test_bit(bus, mp_bus_not_pci))
1114 irq = mp_irqs[idx].mp_srcbusirq;
1117 * PCI IRQs are mapped in order
1121 irq += nr_ioapic_registers[i++];
1125 * For MPS mode, so far only needed by ES7000 platform
1127 if (ioapic_renumber_irq)
1128 irq = ioapic_renumber_irq(apic, irq);
1132 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1134 if ((pin >= 16) && (pin <= 23)) {
1135 if (pirq_entries[pin-16] != -1) {
1136 if (!pirq_entries[pin-16]) {
1137 apic_printk(APIC_VERBOSE, KERN_DEBUG
1138 "disabling PIRQ%d\n", pin-16);
1140 irq = pirq_entries[pin-16];
1141 apic_printk(APIC_VERBOSE, KERN_DEBUG
1142 "using PIRQ%d -> IRQ %d\n",
1150 static inline int IO_APIC_irq_trigger(int irq)
1154 for (apic = 0; apic < nr_ioapics; apic++) {
1155 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1156 idx = find_irq_entry(apic, pin, mp_INT);
1157 if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
1158 return irq_trigger(idx);
1162 * nonexistent IRQs are edge default
1167 /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
1168 static u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
1170 static int __assign_irq_vector(int irq)
1172 static int current_vector = FIRST_DEVICE_VECTOR, current_offset;
1175 BUG_ON((unsigned)irq >= NR_IRQ_VECTORS);
1177 if (irq_vector[irq] > 0)
1178 return irq_vector[irq];
1180 vector = current_vector;
1181 offset = current_offset;
1184 if (vector >= first_system_vector) {
1185 offset = (offset + 1) % 8;
1186 vector = FIRST_DEVICE_VECTOR + offset;
1188 if (vector == current_vector)
1190 if (test_and_set_bit(vector, used_vectors))
1193 current_vector = vector;
1194 current_offset = offset;
1195 irq_vector[irq] = vector;
1200 static int assign_irq_vector(int irq)
1202 unsigned long flags;
1205 spin_lock_irqsave(&vector_lock, flags);
1206 vector = __assign_irq_vector(irq);
1207 spin_unlock_irqrestore(&vector_lock, flags);
1212 void setup_vector_irq(int cpu)
1216 static struct irq_chip ioapic_chip;
1218 #define IOAPIC_AUTO -1
1219 #define IOAPIC_EDGE 0
1220 #define IOAPIC_LEVEL 1
1222 static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
1224 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
1225 trigger == IOAPIC_LEVEL) {
1226 irq_desc[irq].status |= IRQ_LEVEL;
1227 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1228 handle_fasteoi_irq, "fasteoi");
1230 irq_desc[irq].status &= ~IRQ_LEVEL;
1231 set_irq_chip_and_handler_name(irq, &ioapic_chip,
1232 handle_edge_irq, "edge");
1234 set_intr_gate(vector, interrupt[irq]);
1237 static void __init setup_IO_APIC_irqs(void)
1239 struct IO_APIC_route_entry entry;
1240 int apic, pin, idx, irq, first_notcon = 1, vector;
1242 apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
1244 for (apic = 0; apic < nr_ioapics; apic++) {
1245 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1248 * add it to the IO-APIC irq-routing table:
1250 memset(&entry, 0, sizeof(entry));
1252 entry.delivery_mode = INT_DELIVERY_MODE;
1253 entry.dest_mode = INT_DEST_MODE;
1254 entry.mask = 0; /* enable IRQ */
1255 entry.dest.logical.logical_dest =
1256 cpu_mask_to_apicid(TARGET_CPUS);
1258 idx = find_irq_entry(apic, pin, mp_INT);
1261 apic_printk(APIC_VERBOSE, KERN_DEBUG
1262 " IO-APIC (apicid-pin) %d-%d",
1263 mp_ioapics[apic].mp_apicid,
1267 apic_printk(APIC_VERBOSE, ", %d-%d",
1268 mp_ioapics[apic].mp_apicid, pin);
1272 if (!first_notcon) {
1273 apic_printk(APIC_VERBOSE, " not connected.\n");
1277 entry.trigger = irq_trigger(idx);
1278 entry.polarity = irq_polarity(idx);
1280 if (irq_trigger(idx)) {
1285 irq = pin_2_irq(idx, apic, pin);
1287 * skip adding the timer int on secondary nodes, which causes
1288 * a small but painful rift in the time-space continuum
1290 if (multi_timer_check(apic, irq))
1293 add_pin_to_irq(irq, apic, pin);
1295 if (!apic && !IO_APIC_IRQ(irq))
1298 if (IO_APIC_IRQ(irq)) {
1299 vector = assign_irq_vector(irq);
1300 entry.vector = vector;
1301 ioapic_register_intr(irq, vector, IOAPIC_AUTO);
1303 if (!apic && (irq < 16))
1304 disable_8259A_irq(irq);
1306 ioapic_write_entry(apic, pin, entry);
1311 apic_printk(APIC_VERBOSE, " not connected.\n");
1315 * Set up the timer pin, possibly with the 8259A-master behind.
1317 static void __init setup_timer_IRQ0_pin(unsigned int apic, unsigned int pin,
1320 struct IO_APIC_route_entry entry;
1322 memset(&entry, 0, sizeof(entry));
1325 * We use logical delivery to get the timer IRQ
1328 entry.dest_mode = INT_DEST_MODE;
1329 entry.mask = 1; /* mask IRQ now */
1330 entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
1331 entry.delivery_mode = INT_DELIVERY_MODE;
1334 entry.vector = vector;
1337 * The timer IRQ doesn't have to know that behind the
1338 * scene we may have a 8259A-master in AEOI mode ...
1340 ioapic_register_intr(0, vector, IOAPIC_EDGE);
1343 * Add it to the IO-APIC irq-routing table:
1345 ioapic_write_entry(apic, pin, entry);
1348 void __init print_IO_APIC(void)
1351 union IO_APIC_reg_00 reg_00;
1352 union IO_APIC_reg_01 reg_01;
1353 union IO_APIC_reg_02 reg_02;
1354 union IO_APIC_reg_03 reg_03;
1355 unsigned long flags;
1357 if (apic_verbosity == APIC_QUIET)
1360 printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
1361 for (i = 0; i < nr_ioapics; i++)
1362 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
1363 mp_ioapics[i].mp_apicid, nr_ioapic_registers[i]);
1366 * We are a bit conservative about what we expect. We have to
1367 * know about every hardware change ASAP.
1369 printk(KERN_INFO "testing the IO APIC.......................\n");
1371 for (apic = 0; apic < nr_ioapics; apic++) {
1373 spin_lock_irqsave(&ioapic_lock, flags);
1374 reg_00.raw = io_apic_read(apic, 0);
1375 reg_01.raw = io_apic_read(apic, 1);
1376 if (reg_01.bits.version >= 0x10)
1377 reg_02.raw = io_apic_read(apic, 2);
1378 if (reg_01.bits.version >= 0x20)
1379 reg_03.raw = io_apic_read(apic, 3);
1380 spin_unlock_irqrestore(&ioapic_lock, flags);
1382 printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mp_apicid);
1383 printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
1384 printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
1385 printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
1386 printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
1388 printk(KERN_DEBUG ".... register #01: %08X\n", reg_01.raw);
1389 printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
1391 printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
1392 printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
1395 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1396 * but the value of reg_02 is read as the previous read register
1397 * value, so ignore it if reg_02 == reg_01.
1399 if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
1400 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
1401 printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
1405 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1406 * or reg_03, but the value of reg_0[23] is read as the previous read
1407 * register value, so ignore it if reg_03 == reg_0[12].
1409 if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
1410 reg_03.raw != reg_01.raw) {
1411 printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
1412 printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
1415 printk(KERN_DEBUG ".... IRQ redirection table:\n");
1417 printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol"
1418 " Stat Dest Deli Vect: \n");
1420 for (i = 0; i <= reg_01.bits.entries; i++) {
1421 struct IO_APIC_route_entry entry;
1423 entry = ioapic_read_entry(apic, i);
1425 printk(KERN_DEBUG " %02x %03X %02X ",
1427 entry.dest.logical.logical_dest,
1428 entry.dest.physical.physical_dest
1431 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1436 entry.delivery_status,
1438 entry.delivery_mode,
1443 printk(KERN_DEBUG "IRQ to pin mappings:\n");
1444 for (i = 0; i < NR_IRQS; i++) {
1445 struct irq_pin_list *entry = irq_2_pin + i;
1448 printk(KERN_DEBUG "IRQ%d ", i);
1450 printk("-> %d:%d", entry->apic, entry->pin);
1453 entry = irq_2_pin + entry->next;
1458 printk(KERN_INFO ".................................... done.\n");
1465 static void print_APIC_bitfield(int base)
1470 if (apic_verbosity == APIC_QUIET)
1473 printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
1474 for (i = 0; i < 8; i++) {
1475 v = apic_read(base + i*0x10);
1476 for (j = 0; j < 32; j++) {
1486 void /*__init*/ print_local_APIC(void *dummy)
1488 unsigned int v, ver, maxlvt;
1490 if (apic_verbosity == APIC_QUIET)
1493 printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
1494 smp_processor_id(), hard_smp_processor_id());
1495 v = apic_read(APIC_ID);
1496 printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v,
1497 GET_APIC_ID(read_apic_id()));
1498 v = apic_read(APIC_LVR);
1499 printk(KERN_INFO "... APIC VERSION: %08x\n", v);
1500 ver = GET_APIC_VERSION(v);
1501 maxlvt = lapic_get_maxlvt();
1503 v = apic_read(APIC_TASKPRI);
1504 printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
1506 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1507 v = apic_read(APIC_ARBPRI);
1508 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
1509 v & APIC_ARBPRI_MASK);
1510 v = apic_read(APIC_PROCPRI);
1511 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1514 v = apic_read(APIC_EOI);
1515 printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1516 v = apic_read(APIC_RRR);
1517 printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1518 v = apic_read(APIC_LDR);
1519 printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1520 v = apic_read(APIC_DFR);
1521 printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1522 v = apic_read(APIC_SPIV);
1523 printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1525 printk(KERN_DEBUG "... APIC ISR field:\n");
1526 print_APIC_bitfield(APIC_ISR);
1527 printk(KERN_DEBUG "... APIC TMR field:\n");
1528 print_APIC_bitfield(APIC_TMR);
1529 printk(KERN_DEBUG "... APIC IRR field:\n");
1530 print_APIC_bitfield(APIC_IRR);
1532 if (APIC_INTEGRATED(ver)) { /* !82489DX */
1533 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
1534 apic_write(APIC_ESR, 0);
1535 v = apic_read(APIC_ESR);
1536 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1539 v = apic_read(APIC_ICR);
1540 printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1541 v = apic_read(APIC_ICR2);
1542 printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1544 v = apic_read(APIC_LVTT);
1545 printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1547 if (maxlvt > 3) { /* PC is LVT#4. */
1548 v = apic_read(APIC_LVTPC);
1549 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1551 v = apic_read(APIC_LVT0);
1552 printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1553 v = apic_read(APIC_LVT1);
1554 printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1556 if (maxlvt > 2) { /* ERR is LVT#3. */
1557 v = apic_read(APIC_LVTERR);
1558 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1561 v = apic_read(APIC_TMICT);
1562 printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1563 v = apic_read(APIC_TMCCT);
1564 printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1565 v = apic_read(APIC_TDCR);
1566 printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1570 void print_all_local_APICs(void)
1572 on_each_cpu(print_local_APIC, NULL, 1, 1);
1575 void /*__init*/ print_PIC(void)
1578 unsigned long flags;
1580 if (apic_verbosity == APIC_QUIET)
1583 printk(KERN_DEBUG "\nprinting PIC contents\n");
1585 spin_lock_irqsave(&i8259A_lock, flags);
1587 v = inb(0xa1) << 8 | inb(0x21);
1588 printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
1590 v = inb(0xa0) << 8 | inb(0x20);
1591 printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
1595 v = inb(0xa0) << 8 | inb(0x20);
1599 spin_unlock_irqrestore(&i8259A_lock, flags);
1601 printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
1603 v = inb(0x4d1) << 8 | inb(0x4d0);
1604 printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1609 static void __init enable_IO_APIC(void)
1611 union IO_APIC_reg_01 reg_01;
1612 int i8259_apic, i8259_pin;
1614 unsigned long flags;
1616 for (i = 0; i < PIN_MAP_SIZE; i++) {
1617 irq_2_pin[i].pin = -1;
1618 irq_2_pin[i].next = 0;
1621 for (i = 0; i < MAX_PIRQS; i++)
1622 pirq_entries[i] = -1;
1625 * The number of IO-APIC IRQ registers (== #pins):
1627 for (apic = 0; apic < nr_ioapics; apic++) {
1628 spin_lock_irqsave(&ioapic_lock, flags);
1629 reg_01.raw = io_apic_read(apic, 1);
1630 spin_unlock_irqrestore(&ioapic_lock, flags);
1631 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
1633 for (apic = 0; apic < nr_ioapics; apic++) {
1635 /* See if any of the pins is in ExtINT mode */
1636 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
1637 struct IO_APIC_route_entry entry;
1638 entry = ioapic_read_entry(apic, pin);
1641 /* If the interrupt line is enabled and in ExtInt mode
1642 * I have found the pin where the i8259 is connected.
1644 if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
1645 ioapic_i8259.apic = apic;
1646 ioapic_i8259.pin = pin;
1652 /* Look to see what if the MP table has reported the ExtINT */
1653 /* If we could not find the appropriate pin by looking at the ioapic
1654 * the i8259 probably is not connected the ioapic but give the
1655 * mptable a chance anyway.
1657 i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
1658 i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
1659 /* Trust the MP table if nothing is setup in the hardware */
1660 if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
1661 printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
1662 ioapic_i8259.pin = i8259_pin;
1663 ioapic_i8259.apic = i8259_apic;
1665 /* Complain if the MP table and the hardware disagree */
1666 if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
1667 (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
1669 printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
1673 * Do not trust the IO-APIC being empty at bootup
1679 * Not an __init, needed by the reboot code
1681 void disable_IO_APIC(void)
1684 * Clear the IO-APIC before rebooting:
1689 * If the i8259 is routed through an IOAPIC
1690 * Put that IOAPIC in virtual wire mode
1691 * so legacy interrupts can be delivered.
1693 if (ioapic_i8259.pin != -1) {
1694 struct IO_APIC_route_entry entry;
1696 memset(&entry, 0, sizeof(entry));
1697 entry.mask = 0; /* Enabled */
1698 entry.trigger = 0; /* Edge */
1700 entry.polarity = 0; /* High */
1701 entry.delivery_status = 0;
1702 entry.dest_mode = 0; /* Physical */
1703 entry.delivery_mode = dest_ExtINT; /* ExtInt */
1705 entry.dest.physical.physical_dest =
1706 GET_APIC_ID(read_apic_id());
1709 * Add it to the IO-APIC irq-routing table:
1711 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
1713 disconnect_bsp_APIC(ioapic_i8259.pin != -1);
1717 * function to set the IO-APIC physical IDs based on the
1718 * values stored in the MPC table.
1720 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
1723 static void __init setup_ioapic_ids_from_mpc(void)
1725 union IO_APIC_reg_00 reg_00;
1726 physid_mask_t phys_id_present_map;
1729 unsigned char old_id;
1730 unsigned long flags;
1732 #ifdef CONFIG_X86_NUMAQ
1738 * Don't check I/O APIC IDs for xAPIC systems. They have
1739 * no meaning without the serial APIC bus.
1741 if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
1742 || APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
1745 * This is broken; anything with a real cpu count has to
1746 * circumvent this idiocy regardless.
1748 phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map);
1751 * Set the IOAPIC ID to the value stored in the MPC table.
1753 for (apic = 0; apic < nr_ioapics; apic++) {
1755 /* Read the register 0 value */
1756 spin_lock_irqsave(&ioapic_lock, flags);
1757 reg_00.raw = io_apic_read(apic, 0);
1758 spin_unlock_irqrestore(&ioapic_lock, flags);
1760 old_id = mp_ioapics[apic].mp_apicid;
1762 if (mp_ioapics[apic].mp_apicid >= get_physical_broadcast()) {
1763 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
1764 apic, mp_ioapics[apic].mp_apicid);
1765 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1767 mp_ioapics[apic].mp_apicid = reg_00.bits.ID;
1771 * Sanity check, is the ID really free? Every APIC in a
1772 * system must have a unique ID or we get lots of nice
1773 * 'stuck on smp_invalidate_needed IPI wait' messages.
1775 if (check_apicid_used(phys_id_present_map,
1776 mp_ioapics[apic].mp_apicid)) {
1777 printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
1778 apic, mp_ioapics[apic].mp_apicid);
1779 for (i = 0; i < get_physical_broadcast(); i++)
1780 if (!physid_isset(i, phys_id_present_map))
1782 if (i >= get_physical_broadcast())
1783 panic("Max APIC ID exceeded!\n");
1784 printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
1786 physid_set(i, phys_id_present_map);
1787 mp_ioapics[apic].mp_apicid = i;
1790 tmp = apicid_to_cpu_present(mp_ioapics[apic].mp_apicid);
1791 apic_printk(APIC_VERBOSE, "Setting %d in the "
1792 "phys_id_present_map\n",
1793 mp_ioapics[apic].mp_apicid);
1794 physids_or(phys_id_present_map, phys_id_present_map, tmp);
1799 * We need to adjust the IRQ routing table
1800 * if the ID changed.
1802 if (old_id != mp_ioapics[apic].mp_apicid)
1803 for (i = 0; i < mp_irq_entries; i++)
1804 if (mp_irqs[i].mp_dstapic == old_id)
1805 mp_irqs[i].mp_dstapic
1806 = mp_ioapics[apic].mp_apicid;
1809 * Read the right value from the MPC table and
1810 * write it into the ID register.
1812 apic_printk(APIC_VERBOSE, KERN_INFO
1813 "...changing IO-APIC physical APIC ID to %d ...",
1814 mp_ioapics[apic].mp_apicid);
1816 reg_00.bits.ID = mp_ioapics[apic].mp_apicid;
1817 spin_lock_irqsave(&ioapic_lock, flags);
1818 io_apic_write(apic, 0, reg_00.raw);
1819 spin_unlock_irqrestore(&ioapic_lock, flags);
1824 spin_lock_irqsave(&ioapic_lock, flags);
1825 reg_00.raw = io_apic_read(apic, 0);
1826 spin_unlock_irqrestore(&ioapic_lock, flags);
1827 if (reg_00.bits.ID != mp_ioapics[apic].mp_apicid)
1828 printk("could not set ID!\n");
1830 apic_printk(APIC_VERBOSE, " ok.\n");
1834 int no_timer_check __initdata;
1836 static int __init notimercheck(char *s)
1841 __setup("no_timer_check", notimercheck);
1844 * There is a nasty bug in some older SMP boards, their mptable lies
1845 * about the timer IRQ. We do the following to work around the situation:
1847 * - timer IRQ defaults to IO-APIC IRQ
1848 * - if this function detects that timer IRQs are defunct, then we fall
1849 * back to ISA timer IRQs
1851 static int __init timer_irq_works(void)
1853 unsigned long t1 = jiffies;
1854 unsigned long flags;
1859 local_save_flags(flags);
1861 /* Let ten ticks pass... */
1862 mdelay((10 * 1000) / HZ);
1863 local_irq_restore(flags);
1866 * Expect a few ticks at least, to be sure some possible
1867 * glue logic does not lock up after one or two first
1868 * ticks in a non-ExtINT mode. Also the local APIC
1869 * might have cached one ExtINT interrupt. Finally, at
1870 * least one tick may be lost due to delays.
1872 if (time_after(jiffies, t1 + 4))
1879 * In the SMP+IOAPIC case it might happen that there are an unspecified
1880 * number of pending IRQ events unhandled. These cases are very rare,
1881 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1882 * better to do it this way as thus we do not have to be aware of
1883 * 'pending' interrupts in the IRQ path, except at this point.
1886 * Edge triggered needs to resend any interrupt
1887 * that was delayed but this is now handled in the device
1894 * Starting up a edge-triggered IO-APIC interrupt is
1895 * nasty - we need to make sure that we get the edge.
1896 * If it is already asserted for some reason, we need
1897 * return 1 to indicate that is was pending.
1899 * This is not complete - we should be able to fake
1900 * an edge even if it isn't on the 8259A...
1902 * (We do this for level-triggered IRQs too - it cannot hurt.)
1904 static unsigned int startup_ioapic_irq(unsigned int irq)
1906 int was_pending = 0;
1907 unsigned long flags;
1909 spin_lock_irqsave(&ioapic_lock, flags);
1911 disable_8259A_irq(irq);
1912 if (i8259A_irq_pending(irq))
1915 __unmask_IO_APIC_irq(irq);
1916 spin_unlock_irqrestore(&ioapic_lock, flags);
1921 static void ack_ioapic_irq(unsigned int irq)
1923 move_native_irq(irq);
1927 static void ack_ioapic_quirk_irq(unsigned int irq)
1932 move_native_irq(irq);
1934 * It appears there is an erratum which affects at least version 0x11
1935 * of I/O APIC (that's the 82093AA and cores integrated into various
1936 * chipsets). Under certain conditions a level-triggered interrupt is
1937 * erroneously delivered as edge-triggered one but the respective IRR
1938 * bit gets set nevertheless. As a result the I/O unit expects an EOI
1939 * message but it will never arrive and further interrupts are blocked
1940 * from the source. The exact reason is so far unknown, but the
1941 * phenomenon was observed when two consecutive interrupt requests
1942 * from a given source get delivered to the same CPU and the source is
1943 * temporarily disabled in between.
1945 * A workaround is to simulate an EOI message manually. We achieve it
1946 * by setting the trigger mode to edge and then to level when the edge
1947 * trigger mode gets detected in the TMR of a local APIC for a
1948 * level-triggered interrupt. We mask the source for the time of the
1949 * operation to prevent an edge-triggered interrupt escaping meanwhile.
1950 * The idea is from Manfred Spraul. --macro
1952 i = irq_vector[irq];
1954 v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
1958 if (!(v & (1 << (i & 0x1f)))) {
1959 atomic_inc(&irq_mis_count);
1960 spin_lock(&ioapic_lock);
1961 __mask_and_edge_IO_APIC_irq(irq);
1962 __unmask_and_level_IO_APIC_irq(irq);
1963 spin_unlock(&ioapic_lock);
1967 static int ioapic_retrigger_irq(unsigned int irq)
1969 send_IPI_self(irq_vector[irq]);
1974 static struct irq_chip ioapic_chip __read_mostly = {
1976 .startup = startup_ioapic_irq,
1977 .mask = mask_IO_APIC_irq,
1978 .unmask = unmask_IO_APIC_irq,
1979 .ack = ack_ioapic_irq,
1980 .eoi = ack_ioapic_quirk_irq,
1982 .set_affinity = set_ioapic_affinity_irq,
1984 .retrigger = ioapic_retrigger_irq,
1988 static inline void init_IO_APIC_traps(void)
1993 * NOTE! The local APIC isn't very good at handling
1994 * multiple interrupts at the same interrupt level.
1995 * As the interrupt level is determined by taking the
1996 * vector number and shifting that right by 4, we
1997 * want to spread these out a bit so that they don't
1998 * all fall in the same interrupt level.
2000 * Also, we've got to be careful not to trash gate
2001 * 0x80, because int 0x80 is hm, kind of importantish. ;)
2003 for (irq = 0; irq < NR_IRQS ; irq++) {
2004 if (IO_APIC_IRQ(irq) && !irq_vector[irq]) {
2006 * Hmm.. We don't have an entry for this,
2007 * so default to an old-fashioned 8259
2008 * interrupt if we can..
2011 make_8259A_irq(irq);
2013 /* Strange. Oh, well.. */
2014 irq_desc[irq].chip = &no_irq_chip;
2020 * The local APIC irq-chip implementation:
2023 static void ack_lapic_irq(unsigned int irq)
2028 static void mask_lapic_irq(unsigned int irq)
2032 v = apic_read(APIC_LVT0);
2033 apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED);
2036 static void unmask_lapic_irq(unsigned int irq)
2040 v = apic_read(APIC_LVT0);
2041 apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED);
2044 static struct irq_chip lapic_chip __read_mostly = {
2045 .name = "local-APIC",
2046 .mask = mask_lapic_irq,
2047 .unmask = unmask_lapic_irq,
2048 .ack = ack_lapic_irq,
2051 static void lapic_register_intr(int irq, int vector)
2053 irq_desc[irq].status &= ~IRQ_LEVEL;
2054 set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
2056 set_intr_gate(vector, interrupt[irq]);
2059 static void __init setup_nmi(void)
2062 * Dirty trick to enable the NMI watchdog ...
2063 * We put the 8259A master into AEOI mode and
2064 * unmask on all local APICs LVT0 as NMI.
2066 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2067 * is from Maciej W. Rozycki - so we do not have to EOI from
2068 * the NMI handler or the timer interrupt.
2070 apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
2072 enable_NMI_through_LVT0();
2074 apic_printk(APIC_VERBOSE, " done.\n");
2078 * This looks a bit hackish but it's about the only one way of sending
2079 * a few INTA cycles to 8259As and any associated glue logic. ICR does
2080 * not support the ExtINT mode, unfortunately. We need to send these
2081 * cycles as some i82489DX-based boards have glue logic that keeps the
2082 * 8259A interrupt line asserted until INTA. --macro
2084 static inline void __init unlock_ExtINT_logic(void)
2087 struct IO_APIC_route_entry entry0, entry1;
2088 unsigned char save_control, save_freq_select;
2090 pin = find_isa_irq_pin(8, mp_INT);
2095 apic = find_isa_irq_apic(8, mp_INT);
2101 entry0 = ioapic_read_entry(apic, pin);
2102 clear_IO_APIC_pin(apic, pin);
2104 memset(&entry1, 0, sizeof(entry1));
2106 entry1.dest_mode = 0; /* physical delivery */
2107 entry1.mask = 0; /* unmask IRQ now */
2108 entry1.dest.physical.physical_dest = hard_smp_processor_id();
2109 entry1.delivery_mode = dest_ExtINT;
2110 entry1.polarity = entry0.polarity;
2114 ioapic_write_entry(apic, pin, entry1);
2116 save_control = CMOS_READ(RTC_CONTROL);
2117 save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
2118 CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
2120 CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
2125 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
2129 CMOS_WRITE(save_control, RTC_CONTROL);
2130 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
2131 clear_IO_APIC_pin(apic, pin);
2133 ioapic_write_entry(apic, pin, entry0);
2137 * This code may look a bit paranoid, but it's supposed to cooperate with
2138 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2139 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2140 * fanatically on his truly buggy board.
2142 static inline void __init check_timer(void)
2144 int apic1, pin1, apic2, pin2;
2148 unsigned long flags;
2150 local_irq_save(flags);
2152 ver = apic_read(APIC_LVR);
2153 ver = GET_APIC_VERSION(ver);
2156 * get/set the timer IRQ vector:
2158 disable_8259A_irq(0);
2159 vector = assign_irq_vector(0);
2160 set_intr_gate(vector, interrupt[0]);
2163 * As IRQ0 is to be enabled in the 8259A, the virtual
2164 * wire has to be disabled in the local APIC. Also
2165 * timer interrupts need to be acknowledged manually in
2166 * the 8259A for the i82489DX when using the NMI
2167 * watchdog as that APIC treats NMIs as level-triggered.
2168 * The AEOI mode will finish them in the 8259A
2171 apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
2173 timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver));
2175 pin1 = find_isa_irq_pin(0, mp_INT);
2176 apic1 = find_isa_irq_apic(0, mp_INT);
2177 pin2 = ioapic_i8259.pin;
2178 apic2 = ioapic_i8259.apic;
2180 printk(KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
2181 vector, apic1, pin1, apic2, pin2);
2184 * Some BIOS writers are clueless and report the ExtINTA
2185 * I/O APIC input from the cascaded 8259A as the timer
2186 * interrupt input. So just in case, if only one pin
2187 * was found above, try it both directly and through the
2194 } else if (pin2 == -1) {
2201 * Ok, does IRQ0 through the IOAPIC work?
2204 add_pin_to_irq(0, apic1, pin1);
2205 setup_timer_IRQ0_pin(apic1, pin1, vector);
2207 unmask_IO_APIC_irq(0);
2208 if (timer_irq_works()) {
2209 if (nmi_watchdog == NMI_IO_APIC) {
2211 enable_8259A_irq(0);
2213 if (disable_timer_pin_1 > 0)
2214 clear_IO_APIC_pin(0, pin1);
2217 clear_IO_APIC_pin(apic1, pin1);
2219 printk(KERN_ERR "..MP-BIOS bug: "
2220 "8254 timer not connected to IO-APIC\n");
2222 printk(KERN_INFO "...trying to set up timer (IRQ0) "
2223 "through the 8259A ... ");
2224 printk("\n..... (found pin %d) ...", pin2);
2226 * legacy devices should be connected to IO APIC #0
2228 replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
2229 setup_timer_IRQ0_pin(apic2, pin2, vector);
2230 unmask_IO_APIC_irq(0);
2231 enable_8259A_irq(0);
2232 if (timer_irq_works()) {
2234 timer_through_8259 = 1;
2235 if (nmi_watchdog == NMI_IO_APIC) {
2236 disable_8259A_irq(0);
2238 enable_8259A_irq(0);
2243 * Cleanup, just in case ...
2245 disable_8259A_irq(0);
2246 clear_IO_APIC_pin(apic2, pin2);
2247 printk(" failed.\n");
2250 if (nmi_watchdog == NMI_IO_APIC) {
2251 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
2252 nmi_watchdog = NMI_NONE;
2256 printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
2258 lapic_register_intr(0, vector);
2259 apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */
2260 enable_8259A_irq(0);
2262 if (timer_irq_works()) {
2263 printk(" works.\n");
2266 disable_8259A_irq(0);
2267 apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
2268 printk(" failed.\n");
2270 printk(KERN_INFO "...trying to set up timer as ExtINT IRQ...");
2274 apic_write_around(APIC_LVT0, APIC_DM_EXTINT);
2276 unlock_ExtINT_logic();
2278 if (timer_irq_works()) {
2279 printk(" works.\n");
2282 printk(" failed :(.\n");
2283 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
2284 "report. Then try booting with the 'noapic' option");
2286 local_irq_restore(flags);
2290 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
2291 * to devices. However there may be an I/O APIC pin available for
2292 * this interrupt regardless. The pin may be left unconnected, but
2293 * typically it will be reused as an ExtINT cascade interrupt for
2294 * the master 8259A. In the MPS case such a pin will normally be
2295 * reported as an ExtINT interrupt in the MP table. With ACPI
2296 * there is no provision for ExtINT interrupts, and in the absence
2297 * of an override it would be treated as an ordinary ISA I/O APIC
2298 * interrupt, that is edge-triggered and unmasked by default. We
2299 * used to do this, but it caused problems on some systems because
2300 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
2301 * the same ExtINT cascade interrupt to drive the local APIC of the
2302 * bootstrap processor. Therefore we refrain from routing IRQ2 to
2303 * the I/O APIC in all cases now. No actual device should request
2304 * it anyway. --macro
2306 #define PIC_IRQS (1 << PIC_CASCADE_IR)
2308 void __init setup_IO_APIC(void)
2312 /* Reserve all the system vectors. */
2313 for (i = first_system_vector; i < NR_VECTORS; i++)
2314 set_bit(i, used_vectors);
2318 io_apic_irqs = ~PIC_IRQS;
2320 printk("ENABLING IO-APIC IRQs\n");
2323 * Set up IO-APIC IRQ routing.
2326 setup_ioapic_ids_from_mpc();
2328 setup_IO_APIC_irqs();
2329 init_IO_APIC_traps();
2336 * Called after all the initialization is done. If we didnt find any
2337 * APIC bugs then we can allow the modify fast path
2340 static int __init io_apic_bug_finalize(void)
2342 if (sis_apic_bug == -1)
2347 late_initcall(io_apic_bug_finalize);
2349 struct sysfs_ioapic_data {
2350 struct sys_device dev;
2351 struct IO_APIC_route_entry entry[0];
2353 static struct sysfs_ioapic_data *mp_ioapic_data[MAX_IO_APICS];
2355 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
2357 struct IO_APIC_route_entry *entry;
2358 struct sysfs_ioapic_data *data;
2361 data = container_of(dev, struct sysfs_ioapic_data, dev);
2362 entry = data->entry;
2363 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
2364 entry[i] = ioapic_read_entry(dev->id, i);
2369 static int ioapic_resume(struct sys_device *dev)
2371 struct IO_APIC_route_entry *entry;
2372 struct sysfs_ioapic_data *data;
2373 unsigned long flags;
2374 union IO_APIC_reg_00 reg_00;
2377 data = container_of(dev, struct sysfs_ioapic_data, dev);
2378 entry = data->entry;
2380 spin_lock_irqsave(&ioapic_lock, flags);
2381 reg_00.raw = io_apic_read(dev->id, 0);
2382 if (reg_00.bits.ID != mp_ioapics[dev->id].mp_apicid) {
2383 reg_00.bits.ID = mp_ioapics[dev->id].mp_apicid;
2384 io_apic_write(dev->id, 0, reg_00.raw);
2386 spin_unlock_irqrestore(&ioapic_lock, flags);
2387 for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
2388 ioapic_write_entry(dev->id, i, entry[i]);
2393 static struct sysdev_class ioapic_sysdev_class = {
2395 .suspend = ioapic_suspend,
2396 .resume = ioapic_resume,
2399 static int __init ioapic_init_sysfs(void)
2401 struct sys_device *dev;
2402 int i, size, error = 0;
2404 error = sysdev_class_register(&ioapic_sysdev_class);
2408 for (i = 0; i < nr_ioapics; i++) {
2409 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
2410 * sizeof(struct IO_APIC_route_entry);
2411 mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
2412 if (!mp_ioapic_data[i]) {
2413 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2416 dev = &mp_ioapic_data[i]->dev;
2418 dev->cls = &ioapic_sysdev_class;
2419 error = sysdev_register(dev);
2421 kfree(mp_ioapic_data[i]);
2422 mp_ioapic_data[i] = NULL;
2423 printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
2431 device_initcall(ioapic_init_sysfs);
2434 * Dynamic irq allocate and deallocation
2436 int create_irq(void)
2438 /* Allocate an unused irq */
2439 int irq, new, vector = 0;
2440 unsigned long flags;
2443 spin_lock_irqsave(&vector_lock, flags);
2444 for (new = (NR_IRQS - 1); new >= 0; new--) {
2445 if (platform_legacy_irq(new))
2447 if (irq_vector[new] != 0)
2449 vector = __assign_irq_vector(new);
2450 if (likely(vector > 0))
2454 spin_unlock_irqrestore(&vector_lock, flags);
2457 set_intr_gate(vector, interrupt[irq]);
2458 dynamic_irq_init(irq);
2463 void destroy_irq(unsigned int irq)
2465 unsigned long flags;
2467 dynamic_irq_cleanup(irq);
2469 spin_lock_irqsave(&vector_lock, flags);
2470 clear_bit(irq_vector[irq], used_vectors);
2471 irq_vector[irq] = 0;
2472 spin_unlock_irqrestore(&vector_lock, flags);
2476 * MSI message composition
2478 #ifdef CONFIG_PCI_MSI
2479 static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
2484 vector = assign_irq_vector(irq);
2486 dest = cpu_mask_to_apicid(TARGET_CPUS);
2488 msg->address_hi = MSI_ADDR_BASE_HI;
2491 ((INT_DEST_MODE == 0) ?
2492 MSI_ADDR_DEST_MODE_PHYSICAL:
2493 MSI_ADDR_DEST_MODE_LOGICAL) |
2494 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2495 MSI_ADDR_REDIRECTION_CPU:
2496 MSI_ADDR_REDIRECTION_LOWPRI) |
2497 MSI_ADDR_DEST_ID(dest);
2500 MSI_DATA_TRIGGER_EDGE |
2501 MSI_DATA_LEVEL_ASSERT |
2502 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2503 MSI_DATA_DELIVERY_FIXED:
2504 MSI_DATA_DELIVERY_LOWPRI) |
2505 MSI_DATA_VECTOR(vector);
2511 static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
2518 cpus_and(tmp, mask, cpu_online_map);
2519 if (cpus_empty(tmp))
2522 vector = assign_irq_vector(irq);
2526 dest = cpu_mask_to_apicid(mask);
2528 read_msi_msg(irq, &msg);
2530 msg.data &= ~MSI_DATA_VECTOR_MASK;
2531 msg.data |= MSI_DATA_VECTOR(vector);
2532 msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
2533 msg.address_lo |= MSI_ADDR_DEST_ID(dest);
2535 write_msi_msg(irq, &msg);
2536 irq_desc[irq].affinity = mask;
2538 #endif /* CONFIG_SMP */
2541 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
2542 * which implement the MSI or MSI-X Capability Structure.
2544 static struct irq_chip msi_chip = {
2546 .unmask = unmask_msi_irq,
2547 .mask = mask_msi_irq,
2548 .ack = ack_ioapic_irq,
2550 .set_affinity = set_msi_irq_affinity,
2552 .retrigger = ioapic_retrigger_irq,
2555 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
2563 ret = msi_compose_msg(dev, irq, &msg);
2569 set_irq_msi(irq, desc);
2570 write_msi_msg(irq, &msg);
2572 set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq,
2578 void arch_teardown_msi_irq(unsigned int irq)
2583 #endif /* CONFIG_PCI_MSI */
2586 * Hypertransport interrupt support
2588 #ifdef CONFIG_HT_IRQ
2592 static void target_ht_irq(unsigned int irq, unsigned int dest)
2594 struct ht_irq_msg msg;
2595 fetch_ht_irq_msg(irq, &msg);
2597 msg.address_lo &= ~(HT_IRQ_LOW_DEST_ID_MASK);
2598 msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
2600 msg.address_lo |= HT_IRQ_LOW_DEST_ID(dest);
2601 msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
2603 write_ht_irq_msg(irq, &msg);
2606 static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
2611 cpus_and(tmp, mask, cpu_online_map);
2612 if (cpus_empty(tmp))
2615 cpus_and(mask, tmp, CPU_MASK_ALL);
2617 dest = cpu_mask_to_apicid(mask);
2619 target_ht_irq(irq, dest);
2620 irq_desc[irq].affinity = mask;
2624 static struct irq_chip ht_irq_chip = {
2626 .mask = mask_ht_irq,
2627 .unmask = unmask_ht_irq,
2628 .ack = ack_ioapic_irq,
2630 .set_affinity = set_ht_irq_affinity,
2632 .retrigger = ioapic_retrigger_irq,
2635 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
2639 vector = assign_irq_vector(irq);
2641 struct ht_irq_msg msg;
2646 cpu_set(vector >> 8, tmp);
2647 dest = cpu_mask_to_apicid(tmp);
2649 msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
2653 HT_IRQ_LOW_DEST_ID(dest) |
2654 HT_IRQ_LOW_VECTOR(vector) |
2655 ((INT_DEST_MODE == 0) ?
2656 HT_IRQ_LOW_DM_PHYSICAL :
2657 HT_IRQ_LOW_DM_LOGICAL) |
2658 HT_IRQ_LOW_RQEOI_EDGE |
2659 ((INT_DELIVERY_MODE != dest_LowestPrio) ?
2660 HT_IRQ_LOW_MT_FIXED :
2661 HT_IRQ_LOW_MT_ARBITRATED) |
2662 HT_IRQ_LOW_IRQ_MASKED;
2664 write_ht_irq_msg(irq, &msg);
2666 set_irq_chip_and_handler_name(irq, &ht_irq_chip,
2667 handle_edge_irq, "edge");
2671 #endif /* CONFIG_HT_IRQ */
2673 /* --------------------------------------------------------------------------
2674 ACPI-based IOAPIC Configuration
2675 -------------------------------------------------------------------------- */
2679 int __init io_apic_get_unique_id(int ioapic, int apic_id)
2681 union IO_APIC_reg_00 reg_00;
2682 static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
2684 unsigned long flags;
2688 * The P4 platform supports up to 256 APIC IDs on two separate APIC
2689 * buses (one for LAPICs, one for IOAPICs), where predecessors only
2690 * supports up to 16 on one shared APIC bus.
2692 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
2693 * advantage of new APIC bus architecture.
2696 if (physids_empty(apic_id_map))
2697 apic_id_map = ioapic_phys_id_map(phys_cpu_present_map);
2699 spin_lock_irqsave(&ioapic_lock, flags);
2700 reg_00.raw = io_apic_read(ioapic, 0);
2701 spin_unlock_irqrestore(&ioapic_lock, flags);
2703 if (apic_id >= get_physical_broadcast()) {
2704 printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
2705 "%d\n", ioapic, apic_id, reg_00.bits.ID);
2706 apic_id = reg_00.bits.ID;
2710 * Every APIC in a system must have a unique ID or we get lots of nice
2711 * 'stuck on smp_invalidate_needed IPI wait' messages.
2713 if (check_apicid_used(apic_id_map, apic_id)) {
2715 for (i = 0; i < get_physical_broadcast(); i++) {
2716 if (!check_apicid_used(apic_id_map, i))
2720 if (i == get_physical_broadcast())
2721 panic("Max apic_id exceeded!\n");
2723 printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
2724 "trying %d\n", ioapic, apic_id, i);
2729 tmp = apicid_to_cpu_present(apic_id);
2730 physids_or(apic_id_map, apic_id_map, tmp);
2732 if (reg_00.bits.ID != apic_id) {
2733 reg_00.bits.ID = apic_id;
2735 spin_lock_irqsave(&ioapic_lock, flags);
2736 io_apic_write(ioapic, 0, reg_00.raw);
2737 reg_00.raw = io_apic_read(ioapic, 0);
2738 spin_unlock_irqrestore(&ioapic_lock, flags);
2741 if (reg_00.bits.ID != apic_id) {
2742 printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
2747 apic_printk(APIC_VERBOSE, KERN_INFO
2748 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
2754 int __init io_apic_get_version(int ioapic)
2756 union IO_APIC_reg_01 reg_01;
2757 unsigned long flags;
2759 spin_lock_irqsave(&ioapic_lock, flags);
2760 reg_01.raw = io_apic_read(ioapic, 1);
2761 spin_unlock_irqrestore(&ioapic_lock, flags);
2763 return reg_01.bits.version;
2767 int __init io_apic_get_redir_entries(int ioapic)
2769 union IO_APIC_reg_01 reg_01;
2770 unsigned long flags;
2772 spin_lock_irqsave(&ioapic_lock, flags);
2773 reg_01.raw = io_apic_read(ioapic, 1);
2774 spin_unlock_irqrestore(&ioapic_lock, flags);
2776 return reg_01.bits.entries;
2780 int io_apic_set_pci_routing(int ioapic, int pin, int irq, int edge_level, int active_high_low)
2782 struct IO_APIC_route_entry entry;
2784 if (!IO_APIC_IRQ(irq)) {
2785 printk(KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
2791 * Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
2792 * Note that we mask (disable) IRQs now -- these get enabled when the
2793 * corresponding device driver registers for this IRQ.
2796 memset(&entry, 0, sizeof(entry));
2798 entry.delivery_mode = INT_DELIVERY_MODE;
2799 entry.dest_mode = INT_DEST_MODE;
2800 entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
2801 entry.trigger = edge_level;
2802 entry.polarity = active_high_low;
2806 * IRQs < 16 are already in the irq_2_pin[] map
2809 add_pin_to_irq(irq, ioapic, pin);
2811 entry.vector = assign_irq_vector(irq);
2813 apic_printk(APIC_DEBUG, KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry "
2814 "(%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i)\n", ioapic,
2815 mp_ioapics[ioapic].mp_apicid, pin, entry.vector, irq,
2816 edge_level, active_high_low);
2818 ioapic_register_intr(irq, entry.vector, edge_level);
2820 if (!ioapic && (irq < 16))
2821 disable_8259A_irq(irq);
2823 ioapic_write_entry(ioapic, pin, entry);
2828 int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
2832 if (skip_ioapic_setup)
2835 for (i = 0; i < mp_irq_entries; i++)
2836 if (mp_irqs[i].mp_irqtype == mp_INT &&
2837 mp_irqs[i].mp_srcbusirq == bus_irq)
2839 if (i >= mp_irq_entries)
2842 *trigger = irq_trigger(i);
2843 *polarity = irq_polarity(i);
2847 #endif /* CONFIG_ACPI */
2849 static int __init parse_disable_timer_pin_1(char *arg)
2851 disable_timer_pin_1 = 1;
2854 early_param("disable_timer_pin_1", parse_disable_timer_pin_1);
2856 static int __init parse_enable_timer_pin_1(char *arg)
2858 disable_timer_pin_1 = -1;
2861 early_param("enable_timer_pin_1", parse_enable_timer_pin_1);
2863 static int __init parse_noapic(char *arg)
2865 /* disable IO-APIC */
2866 disable_ioapic_setup();
2869 early_param("noapic", parse_noapic);
2871 void __init ioapic_init_mappings(void)
2873 unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
2876 for (i = 0; i < nr_ioapics; i++) {
2877 if (smp_found_config) {
2878 ioapic_phys = mp_ioapics[i].mp_apicaddr;
2881 "WARNING: bogus zero IO-APIC "
2882 "address found in MPTABLE, "
2883 "disabling IO/APIC support!\n");
2884 smp_found_config = 0;
2885 skip_ioapic_setup = 1;
2886 goto fake_ioapic_page;
2890 ioapic_phys = (unsigned long)
2891 alloc_bootmem_pages(PAGE_SIZE);
2892 ioapic_phys = __pa(ioapic_phys);
2894 set_fixmap_nocache(idx, ioapic_phys);
2895 printk(KERN_DEBUG "mapped IOAPIC to %08lx (%08lx)\n",
2896 __fix_to_virt(idx), ioapic_phys);