2 * Intel IO-APIC support for multi-Pentium hosts.
4 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
6 * Many thanks to Stig Venaas for trying out countless experimental
7 * patches and reporting/debugging problems patiently!
9 * (c) 1999, Multiple IO-APIC support, developed by
10 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
11 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
12 * further tested and cleaned up by Zach Brown <zab@redhat.com>
13 * and Ingo Molnar <mingo@redhat.com>
16 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
17 * thanks to Eric Gilmore
19 * for testing these extensively
20 * Paul Diefenbaugh : Added full ACPI support
24 #include <linux/interrupt.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/sched.h>
28 #include <linux/pci.h>
29 #include <linux/mc146818rtc.h>
30 #include <linux/acpi.h>
31 #include <linux/sysdev.h>
32 #include <linux/msi.h>
33 #include <linux/htirq.h>
34 #include <linux/dmar.h>
35 #include <linux/jiffies.h>
37 #include <acpi/acpi_bus.h>
39 #include <linux/bootmem.h>
45 #include <asm/proto.h>
48 #include <asm/i8259.h>
50 #include <asm/msidef.h>
51 #include <asm/hypertransport.h>
54 #include <mach_apic.h>
59 unsigned move_cleanup_count
;
61 u8 move_in_progress
: 1;
64 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
65 static struct irq_cfg irq_cfg
[NR_IRQS
] __read_mostly
= {
66 [0] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ0_VECTOR
, },
67 [1] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ1_VECTOR
, },
68 [2] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ2_VECTOR
, },
69 [3] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ3_VECTOR
, },
70 [4] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ4_VECTOR
, },
71 [5] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ5_VECTOR
, },
72 [6] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ6_VECTOR
, },
73 [7] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ7_VECTOR
, },
74 [8] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ8_VECTOR
, },
75 [9] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ9_VECTOR
, },
76 [10] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ10_VECTOR
, },
77 [11] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ11_VECTOR
, },
78 [12] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ12_VECTOR
, },
79 [13] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ13_VECTOR
, },
80 [14] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ14_VECTOR
, },
81 [15] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ15_VECTOR
, },
84 static int assign_irq_vector(int irq
, cpumask_t mask
);
86 int first_system_vector
= 0xfe;
88 char system_vectors
[NR_VECTORS
] = { [0 ... NR_VECTORS
-1] = SYS_VECTOR_FREE
};
90 #define __apicdebuginit __init
92 int sis_apic_bug
; /* not actually supported, dummy for compile */
94 static int no_timer_check
;
96 static int disable_timer_pin_1 __initdata
;
98 int timer_through_8259 __initdata
;
100 /* Where if anywhere is the i8259 connect in external int mode */
101 static struct { int pin
, apic
; } ioapic_i8259
= { -1, -1 };
103 static DEFINE_SPINLOCK(ioapic_lock
);
104 DEFINE_SPINLOCK(vector_lock
);
107 * # of IRQ routing registers
109 int nr_ioapic_registers
[MAX_IO_APICS
];
111 /* I/O APIC entries */
112 struct mp_config_ioapic mp_ioapics
[MAX_IO_APICS
];
115 /* MP IRQ source entries */
116 struct mp_config_intsrc mp_irqs
[MAX_IRQ_SOURCES
];
118 /* # of MP IRQ source entries */
121 DECLARE_BITMAP(mp_bus_not_pci
, MAX_MP_BUSSES
);
124 * Rough estimation of how many shared IRQs there are, can
125 * be changed anytime.
127 #define MAX_PLUS_SHARED_IRQS NR_IRQS
128 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
131 * This is performance-critical, we want to do it O(1)
133 * the indexing order of this array favors 1:1 mappings
134 * between pins and IRQs.
137 static struct irq_pin_list
{
138 short apic
, pin
, next
;
139 } irq_2_pin
[PIN_MAP_SIZE
];
143 unsigned int unused
[3];
147 static __attribute_const__
struct io_apic __iomem
*io_apic_base(int idx
)
149 return (void __iomem
*) __fix_to_virt(FIX_IO_APIC_BASE_0
+ idx
)
150 + (mp_ioapics
[idx
].mp_apicaddr
& ~PAGE_MASK
);
153 static inline unsigned int io_apic_read(unsigned int apic
, unsigned int reg
)
155 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
156 writel(reg
, &io_apic
->index
);
157 return readl(&io_apic
->data
);
160 static inline void io_apic_write(unsigned int apic
, unsigned int reg
, unsigned int value
)
162 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
163 writel(reg
, &io_apic
->index
);
164 writel(value
, &io_apic
->data
);
168 * Re-write a value: to be used for read-modify-write
169 * cycles where the read already set up the index register.
171 static inline void io_apic_modify(unsigned int apic
, unsigned int value
)
173 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
174 writel(value
, &io_apic
->data
);
177 static bool io_apic_level_ack_pending(unsigned int irq
)
179 struct irq_pin_list
*entry
;
182 spin_lock_irqsave(&ioapic_lock
, flags
);
183 entry
= irq_2_pin
+ irq
;
191 reg
= io_apic_read(entry
->apic
, 0x10 + pin
*2);
192 /* Is the remote IRR bit set? */
193 if (reg
& IO_APIC_REDIR_REMOTE_IRR
) {
194 spin_unlock_irqrestore(&ioapic_lock
, flags
);
199 entry
= irq_2_pin
+ entry
->next
;
201 spin_unlock_irqrestore(&ioapic_lock
, flags
);
207 * Synchronize the IO-APIC and the CPU by doing
208 * a dummy read from the IO-APIC
210 static inline void io_apic_sync(unsigned int apic
)
212 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
213 readl(&io_apic
->data
);
216 #define __DO_ACTION(R, ACTION, FINAL) \
220 struct irq_pin_list *entry = irq_2_pin + irq; \
222 BUG_ON(irq >= NR_IRQS); \
228 reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
230 io_apic_modify(entry->apic, reg); \
234 entry = irq_2_pin + entry->next; \
239 struct { u32 w1
, w2
; };
240 struct IO_APIC_route_entry entry
;
243 static struct IO_APIC_route_entry
ioapic_read_entry(int apic
, int pin
)
245 union entry_union eu
;
247 spin_lock_irqsave(&ioapic_lock
, flags
);
248 eu
.w1
= io_apic_read(apic
, 0x10 + 2 * pin
);
249 eu
.w2
= io_apic_read(apic
, 0x11 + 2 * pin
);
250 spin_unlock_irqrestore(&ioapic_lock
, flags
);
255 * When we write a new IO APIC routing entry, we need to write the high
256 * word first! If the mask bit in the low word is clear, we will enable
257 * the interrupt, and we need to make sure the entry is fully populated
258 * before that happens.
261 __ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
263 union entry_union eu
;
265 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
266 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
269 static void ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
272 spin_lock_irqsave(&ioapic_lock
, flags
);
273 __ioapic_write_entry(apic
, pin
, e
);
274 spin_unlock_irqrestore(&ioapic_lock
, flags
);
278 * When we mask an IO APIC routing entry, we need to write the low
279 * word first, in order to set the mask bit before we change the
282 static void ioapic_mask_entry(int apic
, int pin
)
285 union entry_union eu
= { .entry
.mask
= 1 };
287 spin_lock_irqsave(&ioapic_lock
, flags
);
288 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
289 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
290 spin_unlock_irqrestore(&ioapic_lock
, flags
);
294 static void __target_IO_APIC_irq(unsigned int irq
, unsigned int dest
, u8 vector
)
297 struct irq_pin_list
*entry
= irq_2_pin
+ irq
;
299 BUG_ON(irq
>= NR_IRQS
);
306 io_apic_write(apic
, 0x11 + pin
*2, dest
);
307 reg
= io_apic_read(apic
, 0x10 + pin
*2);
308 reg
&= ~IO_APIC_REDIR_VECTOR_MASK
;
310 io_apic_modify(apic
, reg
);
313 entry
= irq_2_pin
+ entry
->next
;
317 static void set_ioapic_affinity_irq(unsigned int irq
, cpumask_t mask
)
319 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
324 cpus_and(tmp
, mask
, cpu_online_map
);
328 if (assign_irq_vector(irq
, mask
))
331 cpus_and(tmp
, cfg
->domain
, mask
);
332 dest
= cpu_mask_to_apicid(tmp
);
335 * Only the high 8 bits are valid.
337 dest
= SET_APIC_LOGICAL_ID(dest
);
339 spin_lock_irqsave(&ioapic_lock
, flags
);
340 __target_IO_APIC_irq(irq
, dest
, cfg
->vector
);
341 irq_desc
[irq
].affinity
= mask
;
342 spin_unlock_irqrestore(&ioapic_lock
, flags
);
347 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
348 * shared ISA-space IRQs, so we have to support them. We are super
349 * fast in the common case, and fast for shared ISA-space IRQs.
351 static void add_pin_to_irq(unsigned int irq
, int apic
, int pin
)
353 static int first_free_entry
= NR_IRQS
;
354 struct irq_pin_list
*entry
= irq_2_pin
+ irq
;
356 BUG_ON(irq
>= NR_IRQS
);
358 entry
= irq_2_pin
+ entry
->next
;
360 if (entry
->pin
!= -1) {
361 entry
->next
= first_free_entry
;
362 entry
= irq_2_pin
+ entry
->next
;
363 if (++first_free_entry
>= PIN_MAP_SIZE
)
364 panic("io_apic.c: ran out of irq_2_pin entries!");
371 * Reroute an IRQ to a different pin.
373 static void __init
replace_pin_at_irq(unsigned int irq
,
374 int oldapic
, int oldpin
,
375 int newapic
, int newpin
)
377 struct irq_pin_list
*entry
= irq_2_pin
+ irq
;
380 if (entry
->apic
== oldapic
&& entry
->pin
== oldpin
) {
381 entry
->apic
= newapic
;
386 entry
= irq_2_pin
+ entry
->next
;
391 #define DO_ACTION(name,R,ACTION, FINAL) \
393 static void name##_IO_APIC_irq (unsigned int irq) \
394 __DO_ACTION(R, ACTION, FINAL)
397 DO_ACTION(__mask
, 0, |= IO_APIC_REDIR_MASKED
, io_apic_sync(entry
->apic
))
400 DO_ACTION(__unmask
, 0, &= ~IO_APIC_REDIR_MASKED
, )
402 static void mask_IO_APIC_irq (unsigned int irq
)
406 spin_lock_irqsave(&ioapic_lock
, flags
);
407 __mask_IO_APIC_irq(irq
);
408 spin_unlock_irqrestore(&ioapic_lock
, flags
);
411 static void unmask_IO_APIC_irq (unsigned int irq
)
415 spin_lock_irqsave(&ioapic_lock
, flags
);
416 __unmask_IO_APIC_irq(irq
);
417 spin_unlock_irqrestore(&ioapic_lock
, flags
);
420 static void clear_IO_APIC_pin(unsigned int apic
, unsigned int pin
)
422 struct IO_APIC_route_entry entry
;
424 /* Check delivery_mode to be sure we're not clearing an SMI pin */
425 entry
= ioapic_read_entry(apic
, pin
);
426 if (entry
.delivery_mode
== dest_SMI
)
429 * Disable it in the IO-APIC irq-routing table:
431 ioapic_mask_entry(apic
, pin
);
434 static void clear_IO_APIC (void)
438 for (apic
= 0; apic
< nr_ioapics
; apic
++)
439 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++)
440 clear_IO_APIC_pin(apic
, pin
);
443 int skip_ioapic_setup
;
446 static int __init
parse_noapic(char *str
)
448 disable_ioapic_setup();
451 early_param("noapic", parse_noapic
);
453 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
454 static int __init
disable_timer_pin_setup(char *arg
)
456 disable_timer_pin_1
= 1;
459 __setup("disable_timer_pin_1", disable_timer_pin_setup
);
463 * Find the IRQ entry number of a certain pin.
465 static int find_irq_entry(int apic
, int pin
, int type
)
469 for (i
= 0; i
< mp_irq_entries
; i
++)
470 if (mp_irqs
[i
].mp_irqtype
== type
&&
471 (mp_irqs
[i
].mp_dstapic
== mp_ioapics
[apic
].mp_apicid
||
472 mp_irqs
[i
].mp_dstapic
== MP_APIC_ALL
) &&
473 mp_irqs
[i
].mp_dstirq
== pin
)
480 * Find the pin to which IRQ[irq] (ISA) is connected
482 static int __init
find_isa_irq_pin(int irq
, int type
)
486 for (i
= 0; i
< mp_irq_entries
; i
++) {
487 int lbus
= mp_irqs
[i
].mp_srcbus
;
489 if (test_bit(lbus
, mp_bus_not_pci
) &&
490 (mp_irqs
[i
].mp_irqtype
== type
) &&
491 (mp_irqs
[i
].mp_srcbusirq
== irq
))
493 return mp_irqs
[i
].mp_dstirq
;
498 static int __init
find_isa_irq_apic(int irq
, int type
)
502 for (i
= 0; i
< mp_irq_entries
; i
++) {
503 int lbus
= mp_irqs
[i
].mp_srcbus
;
505 if (test_bit(lbus
, mp_bus_not_pci
) &&
506 (mp_irqs
[i
].mp_irqtype
== type
) &&
507 (mp_irqs
[i
].mp_srcbusirq
== irq
))
510 if (i
< mp_irq_entries
) {
512 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
513 if (mp_ioapics
[apic
].mp_apicid
== mp_irqs
[i
].mp_dstapic
)
522 * Find a specific PCI IRQ entry.
523 * Not an __init, possibly needed by modules
525 static int pin_2_irq(int idx
, int apic
, int pin
);
527 int IO_APIC_get_PCI_irq_vector(int bus
, int slot
, int pin
)
529 int apic
, i
, best_guess
= -1;
531 apic_printk(APIC_DEBUG
, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
533 if (test_bit(bus
, mp_bus_not_pci
)) {
534 apic_printk(APIC_VERBOSE
, "PCI BIOS passed nonexistent PCI bus %d!\n", bus
);
537 for (i
= 0; i
< mp_irq_entries
; i
++) {
538 int lbus
= mp_irqs
[i
].mp_srcbus
;
540 for (apic
= 0; apic
< nr_ioapics
; apic
++)
541 if (mp_ioapics
[apic
].mp_apicid
== mp_irqs
[i
].mp_dstapic
||
542 mp_irqs
[i
].mp_dstapic
== MP_APIC_ALL
)
545 if (!test_bit(lbus
, mp_bus_not_pci
) &&
546 !mp_irqs
[i
].mp_irqtype
&&
548 (slot
== ((mp_irqs
[i
].mp_srcbusirq
>> 2) & 0x1f))) {
549 int irq
= pin_2_irq(i
,apic
,mp_irqs
[i
].mp_dstirq
);
551 if (!(apic
|| IO_APIC_IRQ(irq
)))
554 if (pin
== (mp_irqs
[i
].mp_srcbusirq
& 3))
557 * Use the first all-but-pin matching entry as a
558 * best-guess fuzzy result for broken mptables.
564 BUG_ON(best_guess
>= NR_IRQS
);
568 /* ISA interrupts are always polarity zero edge triggered,
569 * when listed as conforming in the MP table. */
571 #define default_ISA_trigger(idx) (0)
572 #define default_ISA_polarity(idx) (0)
574 /* PCI interrupts are always polarity one level triggered,
575 * when listed as conforming in the MP table. */
577 #define default_PCI_trigger(idx) (1)
578 #define default_PCI_polarity(idx) (1)
580 static int MPBIOS_polarity(int idx
)
582 int bus
= mp_irqs
[idx
].mp_srcbus
;
586 * Determine IRQ line polarity (high active or low active):
588 switch (mp_irqs
[idx
].mp_irqflag
& 3)
590 case 0: /* conforms, ie. bus-type dependent polarity */
591 if (test_bit(bus
, mp_bus_not_pci
))
592 polarity
= default_ISA_polarity(idx
);
594 polarity
= default_PCI_polarity(idx
);
596 case 1: /* high active */
601 case 2: /* reserved */
603 printk(KERN_WARNING
"broken BIOS!!\n");
607 case 3: /* low active */
612 default: /* invalid */
614 printk(KERN_WARNING
"broken BIOS!!\n");
622 static int MPBIOS_trigger(int idx
)
624 int bus
= mp_irqs
[idx
].mp_srcbus
;
628 * Determine IRQ trigger mode (edge or level sensitive):
630 switch ((mp_irqs
[idx
].mp_irqflag
>>2) & 3)
632 case 0: /* conforms, ie. bus-type dependent */
633 if (test_bit(bus
, mp_bus_not_pci
))
634 trigger
= default_ISA_trigger(idx
);
636 trigger
= default_PCI_trigger(idx
);
643 case 2: /* reserved */
645 printk(KERN_WARNING
"broken BIOS!!\n");
654 default: /* invalid */
656 printk(KERN_WARNING
"broken BIOS!!\n");
664 static inline int irq_polarity(int idx
)
666 return MPBIOS_polarity(idx
);
669 static inline int irq_trigger(int idx
)
671 return MPBIOS_trigger(idx
);
674 static int pin_2_irq(int idx
, int apic
, int pin
)
677 int bus
= mp_irqs
[idx
].mp_srcbus
;
680 * Debugging check, we are in big trouble if this message pops up!
682 if (mp_irqs
[idx
].mp_dstirq
!= pin
)
683 printk(KERN_ERR
"broken BIOS or MPTABLE parser, ayiee!!\n");
685 if (test_bit(bus
, mp_bus_not_pci
)) {
686 irq
= mp_irqs
[idx
].mp_srcbusirq
;
689 * PCI IRQs are mapped in order
693 irq
+= nr_ioapic_registers
[i
++];
696 BUG_ON(irq
>= NR_IRQS
);
700 static int __assign_irq_vector(int irq
, cpumask_t mask
)
703 * NOTE! The local APIC isn't very good at handling
704 * multiple interrupts at the same interrupt level.
705 * As the interrupt level is determined by taking the
706 * vector number and shifting that right by 4, we
707 * want to spread these out a bit so that they don't
708 * all fall in the same interrupt level.
710 * Also, we've got to be careful not to trash gate
711 * 0x80, because int 0x80 is hm, kind of importantish. ;)
713 static int current_vector
= FIRST_DEVICE_VECTOR
, current_offset
= 0;
714 unsigned int old_vector
;
718 BUG_ON((unsigned)irq
>= NR_IRQS
);
721 /* Only try and allocate irqs on cpus that are present */
722 cpus_and(mask
, mask
, cpu_online_map
);
724 if ((cfg
->move_in_progress
) || cfg
->move_cleanup_count
)
727 old_vector
= cfg
->vector
;
730 cpus_and(tmp
, cfg
->domain
, mask
);
731 if (!cpus_empty(tmp
))
735 for_each_cpu_mask_nr(cpu
, mask
) {
736 cpumask_t domain
, new_mask
;
740 domain
= vector_allocation_domain(cpu
);
741 cpus_and(new_mask
, domain
, cpu_online_map
);
743 vector
= current_vector
;
744 offset
= current_offset
;
747 if (vector
>= first_system_vector
) {
748 /* If we run out of vectors on large boxen, must share them. */
749 offset
= (offset
+ 1) % 8;
750 vector
= FIRST_DEVICE_VECTOR
+ offset
;
752 if (unlikely(current_vector
== vector
))
754 if (vector
== IA32_SYSCALL_VECTOR
)
756 for_each_cpu_mask_nr(new_cpu
, new_mask
)
757 if (per_cpu(vector_irq
, new_cpu
)[vector
] != -1)
760 current_vector
= vector
;
761 current_offset
= offset
;
763 cfg
->move_in_progress
= 1;
764 cfg
->old_domain
= cfg
->domain
;
766 for_each_cpu_mask_nr(new_cpu
, new_mask
)
767 per_cpu(vector_irq
, new_cpu
)[vector
] = irq
;
768 cfg
->vector
= vector
;
769 cfg
->domain
= domain
;
775 static int assign_irq_vector(int irq
, cpumask_t mask
)
780 spin_lock_irqsave(&vector_lock
, flags
);
781 err
= __assign_irq_vector(irq
, mask
);
782 spin_unlock_irqrestore(&vector_lock
, flags
);
786 static void __clear_irq_vector(int irq
)
792 BUG_ON((unsigned)irq
>= NR_IRQS
);
794 BUG_ON(!cfg
->vector
);
796 vector
= cfg
->vector
;
797 cpus_and(mask
, cfg
->domain
, cpu_online_map
);
798 for_each_cpu_mask_nr(cpu
, mask
)
799 per_cpu(vector_irq
, cpu
)[vector
] = -1;
802 cpus_clear(cfg
->domain
);
805 static void __setup_vector_irq(int cpu
)
807 /* Initialize vector_irq on a new cpu */
808 /* This function must be called with vector_lock held */
811 /* Mark the inuse vectors */
812 for (irq
= 0; irq
< NR_IRQS
; ++irq
) {
813 if (!cpu_isset(cpu
, irq_cfg
[irq
].domain
))
815 vector
= irq_cfg
[irq
].vector
;
816 per_cpu(vector_irq
, cpu
)[vector
] = irq
;
818 /* Mark the free vectors */
819 for (vector
= 0; vector
< NR_VECTORS
; ++vector
) {
820 irq
= per_cpu(vector_irq
, cpu
)[vector
];
823 if (!cpu_isset(cpu
, irq_cfg
[irq
].domain
))
824 per_cpu(vector_irq
, cpu
)[vector
] = -1;
828 void setup_vector_irq(int cpu
)
830 spin_lock(&vector_lock
);
831 __setup_vector_irq(smp_processor_id());
832 spin_unlock(&vector_lock
);
836 static struct irq_chip ioapic_chip
;
838 static void ioapic_register_intr(int irq
, unsigned long trigger
)
841 irq_desc
[irq
].status
|= IRQ_LEVEL
;
842 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
843 handle_fasteoi_irq
, "fasteoi");
845 irq_desc
[irq
].status
&= ~IRQ_LEVEL
;
846 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
847 handle_edge_irq
, "edge");
851 static void setup_IO_APIC_irq(int apic
, int pin
, unsigned int irq
,
852 int trigger
, int polarity
)
854 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
855 struct IO_APIC_route_entry entry
;
858 if (!IO_APIC_IRQ(irq
))
862 if (assign_irq_vector(irq
, mask
))
865 cpus_and(mask
, cfg
->domain
, mask
);
867 apic_printk(APIC_VERBOSE
,KERN_DEBUG
868 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
869 "IRQ %d Mode:%i Active:%i)\n",
870 apic
, mp_ioapics
[apic
].mp_apicid
, pin
, cfg
->vector
,
871 irq
, trigger
, polarity
);
874 * add it to the IO-APIC irq-routing table:
876 memset(&entry
,0,sizeof(entry
));
878 entry
.delivery_mode
= INT_DELIVERY_MODE
;
879 entry
.dest_mode
= INT_DEST_MODE
;
880 entry
.dest
= cpu_mask_to_apicid(mask
);
881 entry
.mask
= 0; /* enable IRQ */
882 entry
.trigger
= trigger
;
883 entry
.polarity
= polarity
;
884 entry
.vector
= cfg
->vector
;
886 /* Mask level triggered irqs.
887 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
892 ioapic_register_intr(irq
, trigger
);
894 disable_8259A_irq(irq
);
896 ioapic_write_entry(apic
, pin
, entry
);
899 static void __init
setup_IO_APIC_irqs(void)
901 int apic
, pin
, idx
, irq
, first_notcon
= 1;
903 apic_printk(APIC_VERBOSE
, KERN_DEBUG
"init IO_APIC IRQs\n");
905 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
906 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
908 idx
= find_irq_entry(apic
,pin
,mp_INT
);
911 apic_printk(APIC_VERBOSE
, KERN_DEBUG
" IO-APIC (apicid-pin) %d-%d", mp_ioapics
[apic
].mp_apicid
, pin
);
914 apic_printk(APIC_VERBOSE
, ", %d-%d", mp_ioapics
[apic
].mp_apicid
, pin
);
918 apic_printk(APIC_VERBOSE
, " not connected.\n");
922 irq
= pin_2_irq(idx
, apic
, pin
);
923 add_pin_to_irq(irq
, apic
, pin
);
925 setup_IO_APIC_irq(apic
, pin
, irq
,
926 irq_trigger(idx
), irq_polarity(idx
));
931 apic_printk(APIC_VERBOSE
, " not connected.\n");
935 * Set up the timer pin, possibly with the 8259A-master behind.
937 static void __init
setup_timer_IRQ0_pin(unsigned int apic
, unsigned int pin
,
940 struct IO_APIC_route_entry entry
;
942 memset(&entry
, 0, sizeof(entry
));
945 * We use logical delivery to get the timer IRQ
948 entry
.dest_mode
= INT_DEST_MODE
;
949 entry
.mask
= 1; /* mask IRQ now */
950 entry
.dest
= cpu_mask_to_apicid(TARGET_CPUS
);
951 entry
.delivery_mode
= INT_DELIVERY_MODE
;
954 entry
.vector
= vector
;
957 * The timer IRQ doesn't have to know that behind the
958 * scene we may have a 8259A-master in AEOI mode ...
960 set_irq_chip_and_handler_name(0, &ioapic_chip
, handle_edge_irq
, "edge");
963 * Add it to the IO-APIC irq-routing table:
965 ioapic_write_entry(apic
, pin
, entry
);
968 void __apicdebuginit
print_IO_APIC(void)
971 union IO_APIC_reg_00 reg_00
;
972 union IO_APIC_reg_01 reg_01
;
973 union IO_APIC_reg_02 reg_02
;
976 if (apic_verbosity
== APIC_QUIET
)
979 printk(KERN_DEBUG
"number of MP IRQ sources: %d.\n", mp_irq_entries
);
980 for (i
= 0; i
< nr_ioapics
; i
++)
981 printk(KERN_DEBUG
"number of IO-APIC #%d registers: %d.\n",
982 mp_ioapics
[i
].mp_apicid
, nr_ioapic_registers
[i
]);
985 * We are a bit conservative about what we expect. We have to
986 * know about every hardware change ASAP.
988 printk(KERN_INFO
"testing the IO APIC.......................\n");
990 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
992 spin_lock_irqsave(&ioapic_lock
, flags
);
993 reg_00
.raw
= io_apic_read(apic
, 0);
994 reg_01
.raw
= io_apic_read(apic
, 1);
995 if (reg_01
.bits
.version
>= 0x10)
996 reg_02
.raw
= io_apic_read(apic
, 2);
997 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1000 printk(KERN_DEBUG
"IO APIC #%d......\n", mp_ioapics
[apic
].mp_apicid
);
1001 printk(KERN_DEBUG
".... register #00: %08X\n", reg_00
.raw
);
1002 printk(KERN_DEBUG
"....... : physical APIC id: %02X\n", reg_00
.bits
.ID
);
1004 printk(KERN_DEBUG
".... register #01: %08X\n", *(int *)®_01
);
1005 printk(KERN_DEBUG
"....... : max redirection entries: %04X\n", reg_01
.bits
.entries
);
1007 printk(KERN_DEBUG
"....... : PRQ implemented: %X\n", reg_01
.bits
.PRQ
);
1008 printk(KERN_DEBUG
"....... : IO APIC version: %04X\n", reg_01
.bits
.version
);
1010 if (reg_01
.bits
.version
>= 0x10) {
1011 printk(KERN_DEBUG
".... register #02: %08X\n", reg_02
.raw
);
1012 printk(KERN_DEBUG
"....... : arbitration: %02X\n", reg_02
.bits
.arbitration
);
1015 printk(KERN_DEBUG
".... IRQ redirection table:\n");
1017 printk(KERN_DEBUG
" NR Dst Mask Trig IRR Pol"
1018 " Stat Dmod Deli Vect: \n");
1020 for (i
= 0; i
<= reg_01
.bits
.entries
; i
++) {
1021 struct IO_APIC_route_entry entry
;
1023 entry
= ioapic_read_entry(apic
, i
);
1025 printk(KERN_DEBUG
" %02x %03X ",
1030 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1035 entry
.delivery_status
,
1037 entry
.delivery_mode
,
1042 printk(KERN_DEBUG
"IRQ to pin mappings:\n");
1043 for (i
= 0; i
< NR_IRQS
; i
++) {
1044 struct irq_pin_list
*entry
= irq_2_pin
+ i
;
1047 printk(KERN_DEBUG
"IRQ%d ", i
);
1049 printk("-> %d:%d", entry
->apic
, entry
->pin
);
1052 entry
= irq_2_pin
+ entry
->next
;
1057 printk(KERN_INFO
".................................... done.\n");
1064 static __apicdebuginit
void print_APIC_bitfield (int base
)
1069 if (apic_verbosity
== APIC_QUIET
)
1072 printk(KERN_DEBUG
"0123456789abcdef0123456789abcdef\n" KERN_DEBUG
);
1073 for (i
= 0; i
< 8; i
++) {
1074 v
= apic_read(base
+ i
*0x10);
1075 for (j
= 0; j
< 32; j
++) {
1085 void __apicdebuginit
print_local_APIC(void * dummy
)
1087 unsigned int v
, ver
, maxlvt
;
1089 if (apic_verbosity
== APIC_QUIET
)
1092 printk("\n" KERN_DEBUG
"printing local APIC contents on CPU#%d/%d:\n",
1093 smp_processor_id(), hard_smp_processor_id());
1094 v
= apic_read(APIC_ID
);
1095 printk(KERN_INFO
"... APIC ID: %08x (%01x)\n", v
, GET_APIC_ID(read_apic_id()));
1096 v
= apic_read(APIC_LVR
);
1097 printk(KERN_INFO
"... APIC VERSION: %08x\n", v
);
1098 ver
= GET_APIC_VERSION(v
);
1099 maxlvt
= lapic_get_maxlvt();
1101 v
= apic_read(APIC_TASKPRI
);
1102 printk(KERN_DEBUG
"... APIC TASKPRI: %08x (%02x)\n", v
, v
& APIC_TPRI_MASK
);
1104 v
= apic_read(APIC_ARBPRI
);
1105 printk(KERN_DEBUG
"... APIC ARBPRI: %08x (%02x)\n", v
,
1106 v
& APIC_ARBPRI_MASK
);
1107 v
= apic_read(APIC_PROCPRI
);
1108 printk(KERN_DEBUG
"... APIC PROCPRI: %08x\n", v
);
1110 v
= apic_read(APIC_EOI
);
1111 printk(KERN_DEBUG
"... APIC EOI: %08x\n", v
);
1112 v
= apic_read(APIC_RRR
);
1113 printk(KERN_DEBUG
"... APIC RRR: %08x\n", v
);
1114 v
= apic_read(APIC_LDR
);
1115 printk(KERN_DEBUG
"... APIC LDR: %08x\n", v
);
1116 v
= apic_read(APIC_DFR
);
1117 printk(KERN_DEBUG
"... APIC DFR: %08x\n", v
);
1118 v
= apic_read(APIC_SPIV
);
1119 printk(KERN_DEBUG
"... APIC SPIV: %08x\n", v
);
1121 printk(KERN_DEBUG
"... APIC ISR field:\n");
1122 print_APIC_bitfield(APIC_ISR
);
1123 printk(KERN_DEBUG
"... APIC TMR field:\n");
1124 print_APIC_bitfield(APIC_TMR
);
1125 printk(KERN_DEBUG
"... APIC IRR field:\n");
1126 print_APIC_bitfield(APIC_IRR
);
1128 v
= apic_read(APIC_ESR
);
1129 printk(KERN_DEBUG
"... APIC ESR: %08x\n", v
);
1131 v
= apic_read(APIC_ICR
);
1132 printk(KERN_DEBUG
"... APIC ICR: %08x\n", v
);
1133 v
= apic_read(APIC_ICR2
);
1134 printk(KERN_DEBUG
"... APIC ICR2: %08x\n", v
);
1136 v
= apic_read(APIC_LVTT
);
1137 printk(KERN_DEBUG
"... APIC LVTT: %08x\n", v
);
1139 if (maxlvt
> 3) { /* PC is LVT#4. */
1140 v
= apic_read(APIC_LVTPC
);
1141 printk(KERN_DEBUG
"... APIC LVTPC: %08x\n", v
);
1143 v
= apic_read(APIC_LVT0
);
1144 printk(KERN_DEBUG
"... APIC LVT0: %08x\n", v
);
1145 v
= apic_read(APIC_LVT1
);
1146 printk(KERN_DEBUG
"... APIC LVT1: %08x\n", v
);
1148 if (maxlvt
> 2) { /* ERR is LVT#3. */
1149 v
= apic_read(APIC_LVTERR
);
1150 printk(KERN_DEBUG
"... APIC LVTERR: %08x\n", v
);
1153 v
= apic_read(APIC_TMICT
);
1154 printk(KERN_DEBUG
"... APIC TMICT: %08x\n", v
);
1155 v
= apic_read(APIC_TMCCT
);
1156 printk(KERN_DEBUG
"... APIC TMCCT: %08x\n", v
);
1157 v
= apic_read(APIC_TDCR
);
1158 printk(KERN_DEBUG
"... APIC TDCR: %08x\n", v
);
1162 void print_all_local_APICs (void)
1164 on_each_cpu(print_local_APIC
, NULL
, 1);
1167 void __apicdebuginit
print_PIC(void)
1170 unsigned long flags
;
1172 if (apic_verbosity
== APIC_QUIET
)
1175 printk(KERN_DEBUG
"\nprinting PIC contents\n");
1177 spin_lock_irqsave(&i8259A_lock
, flags
);
1179 v
= inb(0xa1) << 8 | inb(0x21);
1180 printk(KERN_DEBUG
"... PIC IMR: %04x\n", v
);
1182 v
= inb(0xa0) << 8 | inb(0x20);
1183 printk(KERN_DEBUG
"... PIC IRR: %04x\n", v
);
1187 v
= inb(0xa0) << 8 | inb(0x20);
1191 spin_unlock_irqrestore(&i8259A_lock
, flags
);
1193 printk(KERN_DEBUG
"... PIC ISR: %04x\n", v
);
1195 v
= inb(0x4d1) << 8 | inb(0x4d0);
1196 printk(KERN_DEBUG
"... PIC ELCR: %04x\n", v
);
1201 void __init
enable_IO_APIC(void)
1203 union IO_APIC_reg_01 reg_01
;
1204 int i8259_apic
, i8259_pin
;
1206 unsigned long flags
;
1208 for (i
= 0; i
< PIN_MAP_SIZE
; i
++) {
1209 irq_2_pin
[i
].pin
= -1;
1210 irq_2_pin
[i
].next
= 0;
1214 * The number of IO-APIC IRQ registers (== #pins):
1216 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1217 spin_lock_irqsave(&ioapic_lock
, flags
);
1218 reg_01
.raw
= io_apic_read(apic
, 1);
1219 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1220 nr_ioapic_registers
[apic
] = reg_01
.bits
.entries
+1;
1222 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
1224 /* See if any of the pins is in ExtINT mode */
1225 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1226 struct IO_APIC_route_entry entry
;
1227 entry
= ioapic_read_entry(apic
, pin
);
1229 /* If the interrupt line is enabled and in ExtInt mode
1230 * I have found the pin where the i8259 is connected.
1232 if ((entry
.mask
== 0) && (entry
.delivery_mode
== dest_ExtINT
)) {
1233 ioapic_i8259
.apic
= apic
;
1234 ioapic_i8259
.pin
= pin
;
1240 /* Look to see what if the MP table has reported the ExtINT */
1241 i8259_pin
= find_isa_irq_pin(0, mp_ExtINT
);
1242 i8259_apic
= find_isa_irq_apic(0, mp_ExtINT
);
1243 /* Trust the MP table if nothing is setup in the hardware */
1244 if ((ioapic_i8259
.pin
== -1) && (i8259_pin
>= 0)) {
1245 printk(KERN_WARNING
"ExtINT not setup in hardware but reported by MP table\n");
1246 ioapic_i8259
.pin
= i8259_pin
;
1247 ioapic_i8259
.apic
= i8259_apic
;
1249 /* Complain if the MP table and the hardware disagree */
1250 if (((ioapic_i8259
.apic
!= i8259_apic
) || (ioapic_i8259
.pin
!= i8259_pin
)) &&
1251 (i8259_pin
>= 0) && (ioapic_i8259
.pin
>= 0))
1253 printk(KERN_WARNING
"ExtINT in hardware and MP table differ\n");
1257 * Do not trust the IO-APIC being empty at bootup
1263 * Not an __init, needed by the reboot code
1265 void disable_IO_APIC(void)
1268 * Clear the IO-APIC before rebooting:
1273 * If the i8259 is routed through an IOAPIC
1274 * Put that IOAPIC in virtual wire mode
1275 * so legacy interrupts can be delivered.
1277 if (ioapic_i8259
.pin
!= -1) {
1278 struct IO_APIC_route_entry entry
;
1280 memset(&entry
, 0, sizeof(entry
));
1281 entry
.mask
= 0; /* Enabled */
1282 entry
.trigger
= 0; /* Edge */
1284 entry
.polarity
= 0; /* High */
1285 entry
.delivery_status
= 0;
1286 entry
.dest_mode
= 0; /* Physical */
1287 entry
.delivery_mode
= dest_ExtINT
; /* ExtInt */
1289 entry
.dest
= GET_APIC_ID(read_apic_id());
1292 * Add it to the IO-APIC irq-routing table:
1294 ioapic_write_entry(ioapic_i8259
.apic
, ioapic_i8259
.pin
, entry
);
1297 disconnect_bsp_APIC(ioapic_i8259
.pin
!= -1);
1301 * There is a nasty bug in some older SMP boards, their mptable lies
1302 * about the timer IRQ. We do the following to work around the situation:
1304 * - timer IRQ defaults to IO-APIC IRQ
1305 * - if this function detects that timer IRQs are defunct, then we fall
1306 * back to ISA timer IRQs
1308 static int __init
timer_irq_works(void)
1310 unsigned long t1
= jiffies
;
1311 unsigned long flags
;
1313 local_save_flags(flags
);
1315 /* Let ten ticks pass... */
1316 mdelay((10 * 1000) / HZ
);
1317 local_irq_restore(flags
);
1320 * Expect a few ticks at least, to be sure some possible
1321 * glue logic does not lock up after one or two first
1322 * ticks in a non-ExtINT mode. Also the local APIC
1323 * might have cached one ExtINT interrupt. Finally, at
1324 * least one tick may be lost due to delays.
1328 if (time_after(jiffies
, t1
+ 4))
1334 * In the SMP+IOAPIC case it might happen that there are an unspecified
1335 * number of pending IRQ events unhandled. These cases are very rare,
1336 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1337 * better to do it this way as thus we do not have to be aware of
1338 * 'pending' interrupts in the IRQ path, except at this point.
1341 * Edge triggered needs to resend any interrupt
1342 * that was delayed but this is now handled in the device
1347 * Starting up a edge-triggered IO-APIC interrupt is
1348 * nasty - we need to make sure that we get the edge.
1349 * If it is already asserted for some reason, we need
1350 * return 1 to indicate that is was pending.
1352 * This is not complete - we should be able to fake
1353 * an edge even if it isn't on the 8259A...
1356 static unsigned int startup_ioapic_irq(unsigned int irq
)
1358 int was_pending
= 0;
1359 unsigned long flags
;
1361 spin_lock_irqsave(&ioapic_lock
, flags
);
1363 disable_8259A_irq(irq
);
1364 if (i8259A_irq_pending(irq
))
1367 __unmask_IO_APIC_irq(irq
);
1368 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1373 static int ioapic_retrigger_irq(unsigned int irq
)
1375 struct irq_cfg
*cfg
= &irq_cfg
[irq
];
1376 unsigned long flags
;
1378 spin_lock_irqsave(&vector_lock
, flags
);
1379 send_IPI_mask(cpumask_of_cpu(first_cpu(cfg
->domain
)), cfg
->vector
);
1380 spin_unlock_irqrestore(&vector_lock
, flags
);
1386 * Level and edge triggered IO-APIC interrupts need different handling,
1387 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1388 * handled with the level-triggered descriptor, but that one has slightly
1389 * more overhead. Level-triggered interrupts cannot be handled with the
1390 * edge-triggered handler, without risking IRQ storms and other ugly
1395 asmlinkage
void smp_irq_move_cleanup_interrupt(void)
1397 unsigned vector
, me
;
1402 me
= smp_processor_id();
1403 for (vector
= FIRST_EXTERNAL_VECTOR
; vector
< NR_VECTORS
; vector
++) {
1405 struct irq_desc
*desc
;
1406 struct irq_cfg
*cfg
;
1407 irq
= __get_cpu_var(vector_irq
)[vector
];
1411 desc
= irq_desc
+ irq
;
1412 cfg
= irq_cfg
+ irq
;
1413 spin_lock(&desc
->lock
);
1414 if (!cfg
->move_cleanup_count
)
1417 if ((vector
== cfg
->vector
) && cpu_isset(me
, cfg
->domain
))
1420 __get_cpu_var(vector_irq
)[vector
] = -1;
1421 cfg
->move_cleanup_count
--;
1423 spin_unlock(&desc
->lock
);
1429 static void irq_complete_move(unsigned int irq
)
1431 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
1432 unsigned vector
, me
;
1434 if (likely(!cfg
->move_in_progress
))
1437 vector
= ~get_irq_regs()->orig_ax
;
1438 me
= smp_processor_id();
1439 if ((vector
== cfg
->vector
) && cpu_isset(me
, cfg
->domain
)) {
1440 cpumask_t cleanup_mask
;
1442 cpus_and(cleanup_mask
, cfg
->old_domain
, cpu_online_map
);
1443 cfg
->move_cleanup_count
= cpus_weight(cleanup_mask
);
1444 send_IPI_mask(cleanup_mask
, IRQ_MOVE_CLEANUP_VECTOR
);
1445 cfg
->move_in_progress
= 0;
1449 static inline void irq_complete_move(unsigned int irq
) {}
1452 static void ack_apic_edge(unsigned int irq
)
1454 irq_complete_move(irq
);
1455 move_native_irq(irq
);
1459 static void ack_apic_level(unsigned int irq
)
1461 int do_unmask_irq
= 0;
1463 irq_complete_move(irq
);
1464 #ifdef CONFIG_GENERIC_PENDING_IRQ
1465 /* If we are moving the irq we need to mask it */
1466 if (unlikely(irq_desc
[irq
].status
& IRQ_MOVE_PENDING
)) {
1468 mask_IO_APIC_irq(irq
);
1473 * We must acknowledge the irq before we move it or the acknowledge will
1474 * not propagate properly.
1478 /* Now we can move and renable the irq */
1479 if (unlikely(do_unmask_irq
)) {
1480 /* Only migrate the irq if the ack has been received.
1482 * On rare occasions the broadcast level triggered ack gets
1483 * delayed going to ioapics, and if we reprogram the
1484 * vector while Remote IRR is still set the irq will never
1487 * To prevent this scenario we read the Remote IRR bit
1488 * of the ioapic. This has two effects.
1489 * - On any sane system the read of the ioapic will
1490 * flush writes (and acks) going to the ioapic from
1492 * - We get to see if the ACK has actually been delivered.
1494 * Based on failed experiments of reprogramming the
1495 * ioapic entry from outside of irq context starting
1496 * with masking the ioapic entry and then polling until
1497 * Remote IRR was clear before reprogramming the
1498 * ioapic I don't trust the Remote IRR bit to be
1499 * completey accurate.
1501 * However there appears to be no other way to plug
1502 * this race, so if the Remote IRR bit is not
1503 * accurate and is causing problems then it is a hardware bug
1504 * and you can go talk to the chipset vendor about it.
1506 if (!io_apic_level_ack_pending(irq
))
1507 move_masked_irq(irq
);
1508 unmask_IO_APIC_irq(irq
);
1512 static struct irq_chip ioapic_chip __read_mostly
= {
1514 .startup
= startup_ioapic_irq
,
1515 .mask
= mask_IO_APIC_irq
,
1516 .unmask
= unmask_IO_APIC_irq
,
1517 .ack
= ack_apic_edge
,
1518 .eoi
= ack_apic_level
,
1520 .set_affinity
= set_ioapic_affinity_irq
,
1522 .retrigger
= ioapic_retrigger_irq
,
1525 static inline void init_IO_APIC_traps(void)
1530 * NOTE! The local APIC isn't very good at handling
1531 * multiple interrupts at the same interrupt level.
1532 * As the interrupt level is determined by taking the
1533 * vector number and shifting that right by 4, we
1534 * want to spread these out a bit so that they don't
1535 * all fall in the same interrupt level.
1537 * Also, we've got to be careful not to trash gate
1538 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1540 for (irq
= 0; irq
< NR_IRQS
; irq
++) {
1541 if (IO_APIC_IRQ(irq
) && !irq_cfg
[irq
].vector
) {
1543 * Hmm.. We don't have an entry for this,
1544 * so default to an old-fashioned 8259
1545 * interrupt if we can..
1548 make_8259A_irq(irq
);
1550 /* Strange. Oh, well.. */
1551 irq_desc
[irq
].chip
= &no_irq_chip
;
1556 static void unmask_lapic_irq(unsigned int irq
)
1560 v
= apic_read(APIC_LVT0
);
1561 apic_write(APIC_LVT0
, v
& ~APIC_LVT_MASKED
);
1564 static void mask_lapic_irq(unsigned int irq
)
1568 v
= apic_read(APIC_LVT0
);
1569 apic_write(APIC_LVT0
, v
| APIC_LVT_MASKED
);
1572 static void ack_lapic_irq (unsigned int irq
)
1577 static struct irq_chip lapic_chip __read_mostly
= {
1578 .name
= "local-APIC",
1579 .mask
= mask_lapic_irq
,
1580 .unmask
= unmask_lapic_irq
,
1581 .ack
= ack_lapic_irq
,
1584 static void lapic_register_intr(int irq
)
1586 irq_desc
[irq
].status
&= ~IRQ_LEVEL
;
1587 set_irq_chip_and_handler_name(irq
, &lapic_chip
, handle_edge_irq
,
1591 static void __init
setup_nmi(void)
1594 * Dirty trick to enable the NMI watchdog ...
1595 * We put the 8259A master into AEOI mode and
1596 * unmask on all local APICs LVT0 as NMI.
1598 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1599 * is from Maciej W. Rozycki - so we do not have to EOI from
1600 * the NMI handler or the timer interrupt.
1602 printk(KERN_INFO
"activating NMI Watchdog ...");
1604 enable_NMI_through_LVT0();
1610 * This looks a bit hackish but it's about the only one way of sending
1611 * a few INTA cycles to 8259As and any associated glue logic. ICR does
1612 * not support the ExtINT mode, unfortunately. We need to send these
1613 * cycles as some i82489DX-based boards have glue logic that keeps the
1614 * 8259A interrupt line asserted until INTA. --macro
1616 static inline void __init
unlock_ExtINT_logic(void)
1619 struct IO_APIC_route_entry entry0
, entry1
;
1620 unsigned char save_control
, save_freq_select
;
1622 pin
= find_isa_irq_pin(8, mp_INT
);
1623 apic
= find_isa_irq_apic(8, mp_INT
);
1627 entry0
= ioapic_read_entry(apic
, pin
);
1629 clear_IO_APIC_pin(apic
, pin
);
1631 memset(&entry1
, 0, sizeof(entry1
));
1633 entry1
.dest_mode
= 0; /* physical delivery */
1634 entry1
.mask
= 0; /* unmask IRQ now */
1635 entry1
.dest
= hard_smp_processor_id();
1636 entry1
.delivery_mode
= dest_ExtINT
;
1637 entry1
.polarity
= entry0
.polarity
;
1641 ioapic_write_entry(apic
, pin
, entry1
);
1643 save_control
= CMOS_READ(RTC_CONTROL
);
1644 save_freq_select
= CMOS_READ(RTC_FREQ_SELECT
);
1645 CMOS_WRITE((save_freq_select
& ~RTC_RATE_SELECT
) | 0x6,
1647 CMOS_WRITE(save_control
| RTC_PIE
, RTC_CONTROL
);
1652 if ((CMOS_READ(RTC_INTR_FLAGS
) & RTC_PF
) == RTC_PF
)
1656 CMOS_WRITE(save_control
, RTC_CONTROL
);
1657 CMOS_WRITE(save_freq_select
, RTC_FREQ_SELECT
);
1658 clear_IO_APIC_pin(apic
, pin
);
1660 ioapic_write_entry(apic
, pin
, entry0
);
1664 * This code may look a bit paranoid, but it's supposed to cooperate with
1665 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
1666 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
1667 * fanatically on his truly buggy board.
1669 * FIXME: really need to revamp this for modern platforms only.
1671 static inline void __init
check_timer(void)
1673 struct irq_cfg
*cfg
= irq_cfg
+ 0;
1674 int apic1
, pin1
, apic2
, pin2
;
1675 unsigned long flags
;
1678 local_irq_save(flags
);
1681 * get/set the timer IRQ vector:
1683 disable_8259A_irq(0);
1684 assign_irq_vector(0, TARGET_CPUS
);
1687 * As IRQ0 is to be enabled in the 8259A, the virtual
1688 * wire has to be disabled in the local APIC.
1690 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_EXTINT
);
1693 pin1
= find_isa_irq_pin(0, mp_INT
);
1694 apic1
= find_isa_irq_apic(0, mp_INT
);
1695 pin2
= ioapic_i8259
.pin
;
1696 apic2
= ioapic_i8259
.apic
;
1698 apic_printk(APIC_QUIET
, KERN_INFO
"..TIMER: vector=0x%02X "
1699 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
1700 cfg
->vector
, apic1
, pin1
, apic2
, pin2
);
1703 * Some BIOS writers are clueless and report the ExtINTA
1704 * I/O APIC input from the cascaded 8259A as the timer
1705 * interrupt input. So just in case, if only one pin
1706 * was found above, try it both directly and through the
1713 } else if (pin2
== -1) {
1720 * Ok, does IRQ0 through the IOAPIC work?
1723 add_pin_to_irq(0, apic1
, pin1
);
1724 setup_timer_IRQ0_pin(apic1
, pin1
, cfg
->vector
);
1726 unmask_IO_APIC_irq(0);
1727 if (!no_timer_check
&& timer_irq_works()) {
1728 if (nmi_watchdog
== NMI_IO_APIC
) {
1730 enable_8259A_irq(0);
1732 if (disable_timer_pin_1
> 0)
1733 clear_IO_APIC_pin(0, pin1
);
1736 clear_IO_APIC_pin(apic1
, pin1
);
1738 apic_printk(APIC_QUIET
, KERN_ERR
"..MP-BIOS bug: "
1739 "8254 timer not connected to IO-APIC\n");
1741 apic_printk(APIC_QUIET
, KERN_INFO
"...trying to set up timer "
1742 "(IRQ0) through the 8259A ...\n");
1743 apic_printk(APIC_QUIET
, KERN_INFO
1744 "..... (found apic %d pin %d) ...\n", apic2
, pin2
);
1746 * legacy devices should be connected to IO APIC #0
1748 replace_pin_at_irq(0, apic1
, pin1
, apic2
, pin2
);
1749 setup_timer_IRQ0_pin(apic2
, pin2
, cfg
->vector
);
1750 unmask_IO_APIC_irq(0);
1751 enable_8259A_irq(0);
1752 if (timer_irq_works()) {
1753 apic_printk(APIC_QUIET
, KERN_INFO
"....... works.\n");
1754 timer_through_8259
= 1;
1755 if (nmi_watchdog
== NMI_IO_APIC
) {
1756 disable_8259A_irq(0);
1758 enable_8259A_irq(0);
1763 * Cleanup, just in case ...
1765 disable_8259A_irq(0);
1766 clear_IO_APIC_pin(apic2
, pin2
);
1767 apic_printk(APIC_QUIET
, KERN_INFO
"....... failed.\n");
1770 if (nmi_watchdog
== NMI_IO_APIC
) {
1771 apic_printk(APIC_QUIET
, KERN_WARNING
"timer doesn't work "
1772 "through the IO-APIC - disabling NMI Watchdog!\n");
1773 nmi_watchdog
= NMI_NONE
;
1776 apic_printk(APIC_QUIET
, KERN_INFO
1777 "...trying to set up timer as Virtual Wire IRQ...\n");
1779 lapic_register_intr(0);
1780 apic_write(APIC_LVT0
, APIC_DM_FIXED
| cfg
->vector
); /* Fixed mode */
1781 enable_8259A_irq(0);
1783 if (timer_irq_works()) {
1784 apic_printk(APIC_QUIET
, KERN_INFO
"..... works.\n");
1787 disable_8259A_irq(0);
1788 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_FIXED
| cfg
->vector
);
1789 apic_printk(APIC_QUIET
, KERN_INFO
"..... failed.\n");
1791 apic_printk(APIC_QUIET
, KERN_INFO
1792 "...trying to set up timer as ExtINT IRQ...\n");
1796 apic_write(APIC_LVT0
, APIC_DM_EXTINT
);
1798 unlock_ExtINT_logic();
1800 if (timer_irq_works()) {
1801 apic_printk(APIC_QUIET
, KERN_INFO
"..... works.\n");
1804 apic_printk(APIC_QUIET
, KERN_INFO
"..... failed :(.\n");
1805 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
1806 "report. Then try booting with the 'noapic' option.\n");
1808 local_irq_restore(flags
);
1811 static int __init
notimercheck(char *s
)
1816 __setup("no_timer_check", notimercheck
);
1819 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
1820 * to devices. However there may be an I/O APIC pin available for
1821 * this interrupt regardless. The pin may be left unconnected, but
1822 * typically it will be reused as an ExtINT cascade interrupt for
1823 * the master 8259A. In the MPS case such a pin will normally be
1824 * reported as an ExtINT interrupt in the MP table. With ACPI
1825 * there is no provision for ExtINT interrupts, and in the absence
1826 * of an override it would be treated as an ordinary ISA I/O APIC
1827 * interrupt, that is edge-triggered and unmasked by default. We
1828 * used to do this, but it caused problems on some systems because
1829 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
1830 * the same ExtINT cascade interrupt to drive the local APIC of the
1831 * bootstrap processor. Therefore we refrain from routing IRQ2 to
1832 * the I/O APIC in all cases now. No actual device should request
1833 * it anyway. --macro
1835 #define PIC_IRQS (1<<2)
1837 void __init
setup_IO_APIC(void)
1841 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
1844 io_apic_irqs
= ~PIC_IRQS
;
1846 apic_printk(APIC_VERBOSE
, "ENABLING IO-APIC IRQs\n");
1849 setup_IO_APIC_irqs();
1850 init_IO_APIC_traps();
1856 struct sysfs_ioapic_data
{
1857 struct sys_device dev
;
1858 struct IO_APIC_route_entry entry
[0];
1860 static struct sysfs_ioapic_data
* mp_ioapic_data
[MAX_IO_APICS
];
1862 static int ioapic_suspend(struct sys_device
*dev
, pm_message_t state
)
1864 struct IO_APIC_route_entry
*entry
;
1865 struct sysfs_ioapic_data
*data
;
1868 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
1869 entry
= data
->entry
;
1870 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++, entry
++ )
1871 *entry
= ioapic_read_entry(dev
->id
, i
);
1876 static int ioapic_resume(struct sys_device
*dev
)
1878 struct IO_APIC_route_entry
*entry
;
1879 struct sysfs_ioapic_data
*data
;
1880 unsigned long flags
;
1881 union IO_APIC_reg_00 reg_00
;
1884 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
1885 entry
= data
->entry
;
1887 spin_lock_irqsave(&ioapic_lock
, flags
);
1888 reg_00
.raw
= io_apic_read(dev
->id
, 0);
1889 if (reg_00
.bits
.ID
!= mp_ioapics
[dev
->id
].mp_apicid
) {
1890 reg_00
.bits
.ID
= mp_ioapics
[dev
->id
].mp_apicid
;
1891 io_apic_write(dev
->id
, 0, reg_00
.raw
);
1893 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1894 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++)
1895 ioapic_write_entry(dev
->id
, i
, entry
[i
]);
1900 static struct sysdev_class ioapic_sysdev_class
= {
1902 .suspend
= ioapic_suspend
,
1903 .resume
= ioapic_resume
,
1906 static int __init
ioapic_init_sysfs(void)
1908 struct sys_device
* dev
;
1911 error
= sysdev_class_register(&ioapic_sysdev_class
);
1915 for (i
= 0; i
< nr_ioapics
; i
++ ) {
1916 size
= sizeof(struct sys_device
) + nr_ioapic_registers
[i
]
1917 * sizeof(struct IO_APIC_route_entry
);
1918 mp_ioapic_data
[i
] = kzalloc(size
, GFP_KERNEL
);
1919 if (!mp_ioapic_data
[i
]) {
1920 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
1923 dev
= &mp_ioapic_data
[i
]->dev
;
1925 dev
->cls
= &ioapic_sysdev_class
;
1926 error
= sysdev_register(dev
);
1928 kfree(mp_ioapic_data
[i
]);
1929 mp_ioapic_data
[i
] = NULL
;
1930 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
1938 device_initcall(ioapic_init_sysfs
);
1941 * Dynamic irq allocate and deallocation
1943 int create_irq(void)
1945 /* Allocate an unused irq */
1948 unsigned long flags
;
1951 spin_lock_irqsave(&vector_lock
, flags
);
1952 for (new = (NR_IRQS
- 1); new >= 0; new--) {
1953 if (platform_legacy_irq(new))
1955 if (irq_cfg
[new].vector
!= 0)
1957 if (__assign_irq_vector(new, TARGET_CPUS
) == 0)
1961 spin_unlock_irqrestore(&vector_lock
, flags
);
1964 dynamic_irq_init(irq
);
1969 void destroy_irq(unsigned int irq
)
1971 unsigned long flags
;
1973 dynamic_irq_cleanup(irq
);
1975 spin_lock_irqsave(&vector_lock
, flags
);
1976 __clear_irq_vector(irq
);
1977 spin_unlock_irqrestore(&vector_lock
, flags
);
1981 * MSI message composition
1983 #ifdef CONFIG_PCI_MSI
1984 static int msi_compose_msg(struct pci_dev
*pdev
, unsigned int irq
, struct msi_msg
*msg
)
1986 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
1992 err
= assign_irq_vector(irq
, tmp
);
1994 cpus_and(tmp
, cfg
->domain
, tmp
);
1995 dest
= cpu_mask_to_apicid(tmp
);
1997 msg
->address_hi
= MSI_ADDR_BASE_HI
;
2000 ((INT_DEST_MODE
== 0) ?
2001 MSI_ADDR_DEST_MODE_PHYSICAL
:
2002 MSI_ADDR_DEST_MODE_LOGICAL
) |
2003 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
2004 MSI_ADDR_REDIRECTION_CPU
:
2005 MSI_ADDR_REDIRECTION_LOWPRI
) |
2006 MSI_ADDR_DEST_ID(dest
);
2009 MSI_DATA_TRIGGER_EDGE
|
2010 MSI_DATA_LEVEL_ASSERT
|
2011 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
2012 MSI_DATA_DELIVERY_FIXED
:
2013 MSI_DATA_DELIVERY_LOWPRI
) |
2014 MSI_DATA_VECTOR(cfg
->vector
);
2020 static void set_msi_irq_affinity(unsigned int irq
, cpumask_t mask
)
2022 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2027 cpus_and(tmp
, mask
, cpu_online_map
);
2028 if (cpus_empty(tmp
))
2031 if (assign_irq_vector(irq
, mask
))
2034 cpus_and(tmp
, cfg
->domain
, mask
);
2035 dest
= cpu_mask_to_apicid(tmp
);
2037 read_msi_msg(irq
, &msg
);
2039 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
2040 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
2041 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
2042 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
2044 write_msi_msg(irq
, &msg
);
2045 irq_desc
[irq
].affinity
= mask
;
2047 #endif /* CONFIG_SMP */
2050 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
2051 * which implement the MSI or MSI-X Capability Structure.
2053 static struct irq_chip msi_chip
= {
2055 .unmask
= unmask_msi_irq
,
2056 .mask
= mask_msi_irq
,
2057 .ack
= ack_apic_edge
,
2059 .set_affinity
= set_msi_irq_affinity
,
2061 .retrigger
= ioapic_retrigger_irq
,
2064 int arch_setup_msi_irq(struct pci_dev
*dev
, struct msi_desc
*desc
)
2072 ret
= msi_compose_msg(dev
, irq
, &msg
);
2078 set_irq_msi(irq
, desc
);
2079 write_msi_msg(irq
, &msg
);
2081 set_irq_chip_and_handler_name(irq
, &msi_chip
, handle_edge_irq
, "edge");
2086 void arch_teardown_msi_irq(unsigned int irq
)
2093 static void dmar_msi_set_affinity(unsigned int irq
, cpumask_t mask
)
2095 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2100 cpus_and(tmp
, mask
, cpu_online_map
);
2101 if (cpus_empty(tmp
))
2104 if (assign_irq_vector(irq
, mask
))
2107 cpus_and(tmp
, cfg
->domain
, mask
);
2108 dest
= cpu_mask_to_apicid(tmp
);
2110 dmar_msi_read(irq
, &msg
);
2112 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
2113 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
2114 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
2115 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
2117 dmar_msi_write(irq
, &msg
);
2118 irq_desc
[irq
].affinity
= mask
;
2120 #endif /* CONFIG_SMP */
2122 struct irq_chip dmar_msi_type
= {
2124 .unmask
= dmar_msi_unmask
,
2125 .mask
= dmar_msi_mask
,
2126 .ack
= ack_apic_edge
,
2128 .set_affinity
= dmar_msi_set_affinity
,
2130 .retrigger
= ioapic_retrigger_irq
,
2133 int arch_setup_dmar_msi(unsigned int irq
)
2138 ret
= msi_compose_msg(NULL
, irq
, &msg
);
2141 dmar_msi_write(irq
, &msg
);
2142 set_irq_chip_and_handler_name(irq
, &dmar_msi_type
, handle_edge_irq
,
2148 #endif /* CONFIG_PCI_MSI */
2150 * Hypertransport interrupt support
2152 #ifdef CONFIG_HT_IRQ
2156 static void target_ht_irq(unsigned int irq
, unsigned int dest
, u8 vector
)
2158 struct ht_irq_msg msg
;
2159 fetch_ht_irq_msg(irq
, &msg
);
2161 msg
.address_lo
&= ~(HT_IRQ_LOW_VECTOR_MASK
| HT_IRQ_LOW_DEST_ID_MASK
);
2162 msg
.address_hi
&= ~(HT_IRQ_HIGH_DEST_ID_MASK
);
2164 msg
.address_lo
|= HT_IRQ_LOW_VECTOR(vector
) | HT_IRQ_LOW_DEST_ID(dest
);
2165 msg
.address_hi
|= HT_IRQ_HIGH_DEST_ID(dest
);
2167 write_ht_irq_msg(irq
, &msg
);
2170 static void set_ht_irq_affinity(unsigned int irq
, cpumask_t mask
)
2172 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2176 cpus_and(tmp
, mask
, cpu_online_map
);
2177 if (cpus_empty(tmp
))
2180 if (assign_irq_vector(irq
, mask
))
2183 cpus_and(tmp
, cfg
->domain
, mask
);
2184 dest
= cpu_mask_to_apicid(tmp
);
2186 target_ht_irq(irq
, dest
, cfg
->vector
);
2187 irq_desc
[irq
].affinity
= mask
;
2191 static struct irq_chip ht_irq_chip
= {
2193 .mask
= mask_ht_irq
,
2194 .unmask
= unmask_ht_irq
,
2195 .ack
= ack_apic_edge
,
2197 .set_affinity
= set_ht_irq_affinity
,
2199 .retrigger
= ioapic_retrigger_irq
,
2202 int arch_setup_ht_irq(unsigned int irq
, struct pci_dev
*dev
)
2204 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2209 err
= assign_irq_vector(irq
, tmp
);
2211 struct ht_irq_msg msg
;
2214 cpus_and(tmp
, cfg
->domain
, tmp
);
2215 dest
= cpu_mask_to_apicid(tmp
);
2217 msg
.address_hi
= HT_IRQ_HIGH_DEST_ID(dest
);
2221 HT_IRQ_LOW_DEST_ID(dest
) |
2222 HT_IRQ_LOW_VECTOR(cfg
->vector
) |
2223 ((INT_DEST_MODE
== 0) ?
2224 HT_IRQ_LOW_DM_PHYSICAL
:
2225 HT_IRQ_LOW_DM_LOGICAL
) |
2226 HT_IRQ_LOW_RQEOI_EDGE
|
2227 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
2228 HT_IRQ_LOW_MT_FIXED
:
2229 HT_IRQ_LOW_MT_ARBITRATED
) |
2230 HT_IRQ_LOW_IRQ_MASKED
;
2232 write_ht_irq_msg(irq
, &msg
);
2234 set_irq_chip_and_handler_name(irq
, &ht_irq_chip
,
2235 handle_edge_irq
, "edge");
2239 #endif /* CONFIG_HT_IRQ */
2241 /* --------------------------------------------------------------------------
2242 ACPI-based IOAPIC Configuration
2243 -------------------------------------------------------------------------- */
2247 #define IO_APIC_MAX_ID 0xFE
2249 int __init
io_apic_get_redir_entries (int ioapic
)
2251 union IO_APIC_reg_01 reg_01
;
2252 unsigned long flags
;
2254 spin_lock_irqsave(&ioapic_lock
, flags
);
2255 reg_01
.raw
= io_apic_read(ioapic
, 1);
2256 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2258 return reg_01
.bits
.entries
;
2262 int io_apic_set_pci_routing (int ioapic
, int pin
, int irq
, int triggering
, int polarity
)
2264 if (!IO_APIC_IRQ(irq
)) {
2265 apic_printk(APIC_QUIET
,KERN_ERR
"IOAPIC[%d]: Invalid reference to IRQ 0\n",
2271 * IRQs < 16 are already in the irq_2_pin[] map
2274 add_pin_to_irq(irq
, ioapic
, pin
);
2276 setup_IO_APIC_irq(ioapic
, pin
, irq
, triggering
, polarity
);
2282 int acpi_get_override_irq(int bus_irq
, int *trigger
, int *polarity
)
2286 if (skip_ioapic_setup
)
2289 for (i
= 0; i
< mp_irq_entries
; i
++)
2290 if (mp_irqs
[i
].mp_irqtype
== mp_INT
&&
2291 mp_irqs
[i
].mp_srcbusirq
== bus_irq
)
2293 if (i
>= mp_irq_entries
)
2296 *trigger
= irq_trigger(i
);
2297 *polarity
= irq_polarity(i
);
2301 #endif /* CONFIG_ACPI */
2304 * This function currently is only a helper for the i386 smp boot process where
2305 * we need to reprogram the ioredtbls to cater for the cpus which have come online
2306 * so mask in all cases should simply be TARGET_CPUS
2309 void __init
setup_ioapic_dest(void)
2311 int pin
, ioapic
, irq
, irq_entry
;
2313 if (skip_ioapic_setup
== 1)
2316 for (ioapic
= 0; ioapic
< nr_ioapics
; ioapic
++) {
2317 for (pin
= 0; pin
< nr_ioapic_registers
[ioapic
]; pin
++) {
2318 irq_entry
= find_irq_entry(ioapic
, pin
, mp_INT
);
2319 if (irq_entry
== -1)
2321 irq
= pin_2_irq(irq_entry
, ioapic
, pin
);
2323 /* setup_IO_APIC_irqs could fail to get vector for some device
2324 * when you have too many devices, because at that time only boot
2327 if (!irq_cfg
[irq
].vector
)
2328 setup_IO_APIC_irq(ioapic
, pin
, irq
,
2329 irq_trigger(irq_entry
),
2330 irq_polarity(irq_entry
));
2332 set_ioapic_affinity_irq(irq
, TARGET_CPUS
);
2339 #define IOAPIC_RESOURCE_NAME_SIZE 11
2341 static struct resource
*ioapic_resources
;
2343 static struct resource
* __init
ioapic_setup_resources(void)
2346 struct resource
*res
;
2350 if (nr_ioapics
<= 0)
2353 n
= IOAPIC_RESOURCE_NAME_SIZE
+ sizeof(struct resource
);
2356 mem
= alloc_bootmem(n
);
2360 mem
+= sizeof(struct resource
) * nr_ioapics
;
2362 for (i
= 0; i
< nr_ioapics
; i
++) {
2364 res
[i
].flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
2365 sprintf(mem
, "IOAPIC %u", i
);
2366 mem
+= IOAPIC_RESOURCE_NAME_SIZE
;
2370 ioapic_resources
= res
;
2375 void __init
ioapic_init_mappings(void)
2377 unsigned long ioapic_phys
, idx
= FIX_IO_APIC_BASE_0
;
2378 struct resource
*ioapic_res
;
2381 ioapic_res
= ioapic_setup_resources();
2382 for (i
= 0; i
< nr_ioapics
; i
++) {
2383 if (smp_found_config
) {
2384 ioapic_phys
= mp_ioapics
[i
].mp_apicaddr
;
2386 ioapic_phys
= (unsigned long)
2387 alloc_bootmem_pages(PAGE_SIZE
);
2388 ioapic_phys
= __pa(ioapic_phys
);
2390 set_fixmap_nocache(idx
, ioapic_phys
);
2391 apic_printk(APIC_VERBOSE
,
2392 "mapped IOAPIC to %016lx (%016lx)\n",
2393 __fix_to_virt(idx
), ioapic_phys
);
2396 if (ioapic_res
!= NULL
) {
2397 ioapic_res
->start
= ioapic_phys
;
2398 ioapic_res
->end
= ioapic_phys
+ (4 * 1024) - 1;
2404 static int __init
ioapic_insert_resources(void)
2407 struct resource
*r
= ioapic_resources
;
2411 "IO APIC resources could be not be allocated.\n");
2415 for (i
= 0; i
< nr_ioapics
; i
++) {
2416 insert_resource(&iomem_resource
, r
);
2423 /* Insert the IO APIC resources after PCI initialization has occured to handle
2424 * IO APICS that are mapped in on a BAR in PCI space. */
2425 late_initcall(ioapic_insert_resources
);