2 * Intel IO-APIC support for multi-Pentium hosts.
4 * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
6 * Many thanks to Stig Venaas for trying out countless experimental
7 * patches and reporting/debugging problems patiently!
9 * (c) 1999, Multiple IO-APIC support, developed by
10 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
11 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
12 * further tested and cleaned up by Zach Brown <zab@redhat.com>
13 * and Ingo Molnar <mingo@redhat.com>
16 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
17 * thanks to Eric Gilmore
19 * for testing these extensively
20 * Paul Diefenbaugh : Added full ACPI support
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/compiler.h>
31 #include <linux/acpi.h>
32 #include <linux/module.h>
33 #include <linux/sysdev.h>
34 #include <linux/msi.h>
35 #include <linux/htirq.h>
36 #include <linux/freezer.h>
37 #include <linux/kthread.h>
38 #include <linux/jiffies.h> /* time_after() */
40 #include <acpi/acpi_bus.h>
42 #include <linux/bootmem.h>
43 #include <linux/dmar.h>
44 #include <linux/hpet.h>
51 #include <asm/proto.h>
54 #include <asm/timer.h>
55 #include <asm/i8259.h>
57 #include <asm/msidef.h>
58 #include <asm/hypertransport.h>
59 #include <asm/setup.h>
60 #include <asm/irq_remapping.h>
62 #include <asm/hw_irq.h>
66 #define __apicdebuginit(type) static type __init
67 #define for_each_irq_pin(entry, head) \
68 for (entry = head; entry; entry = entry->next)
71 * Is the SiS APIC rmw bug present ?
72 * -1 = don't know, 0 = no, 1 = yes
74 int sis_apic_bug
= -1;
76 static DEFINE_RAW_SPINLOCK(ioapic_lock
);
77 static DEFINE_RAW_SPINLOCK(vector_lock
);
80 * # of IRQ routing registers
82 int nr_ioapic_registers
[MAX_IO_APICS
];
84 /* I/O APIC entries */
85 struct mpc_ioapic mp_ioapics
[MAX_IO_APICS
];
88 /* IO APIC gsi routing info */
89 struct mp_ioapic_gsi mp_gsi_routing
[MAX_IO_APICS
];
91 /* MP IRQ source entries */
92 struct mpc_intsrc mp_irqs
[MAX_IRQ_SOURCES
];
94 /* # of MP IRQ source entries */
98 static int nr_irqs_gsi
= NR_IRQS_LEGACY
;
100 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
101 int mp_bus_id_to_type
[MAX_MP_BUSSES
];
104 DECLARE_BITMAP(mp_bus_not_pci
, MAX_MP_BUSSES
);
106 int skip_ioapic_setup
;
108 void arch_disable_smp_support(void)
112 noioapicreroute
= -1;
114 skip_ioapic_setup
= 1;
117 static int __init
parse_noapic(char *str
)
119 /* disable IO-APIC */
120 arch_disable_smp_support();
123 early_param("noapic", parse_noapic
);
125 struct irq_pin_list
{
127 struct irq_pin_list
*next
;
130 static struct irq_pin_list
*get_one_free_irq_2_pin(int node
)
132 struct irq_pin_list
*pin
;
134 pin
= kzalloc_node(sizeof(*pin
), GFP_ATOMIC
, node
);
139 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
140 #ifdef CONFIG_SPARSE_IRQ
141 static struct irq_cfg irq_cfgx
[NR_IRQS_LEGACY
];
143 static struct irq_cfg irq_cfgx
[NR_IRQS
];
146 int __init
arch_early_irq_init(void)
149 struct irq_desc
*desc
;
154 if (!legacy_pic
->nr_legacy_irqs
) {
160 count
= ARRAY_SIZE(irq_cfgx
);
161 node
= cpu_to_node(boot_cpu_id
);
163 for (i
= 0; i
< count
; i
++) {
164 desc
= irq_to_desc(i
);
165 desc
->chip_data
= &cfg
[i
];
166 zalloc_cpumask_var_node(&cfg
[i
].domain
, GFP_NOWAIT
, node
);
167 zalloc_cpumask_var_node(&cfg
[i
].old_domain
, GFP_NOWAIT
, node
);
169 * For legacy IRQ's, start with assigning irq0 to irq15 to
170 * IRQ0_VECTOR to IRQ15_VECTOR on cpu 0.
172 if (i
< legacy_pic
->nr_legacy_irqs
) {
173 cfg
[i
].vector
= IRQ0_VECTOR
+ i
;
174 cpumask_set_cpu(0, cfg
[i
].domain
);
181 #ifdef CONFIG_SPARSE_IRQ
182 struct irq_cfg
*irq_cfg(unsigned int irq
)
184 struct irq_cfg
*cfg
= NULL
;
185 struct irq_desc
*desc
;
187 desc
= irq_to_desc(irq
);
189 cfg
= desc
->chip_data
;
194 static struct irq_cfg
*get_one_free_irq_cfg(int node
)
198 cfg
= kzalloc_node(sizeof(*cfg
), GFP_ATOMIC
, node
);
200 if (!zalloc_cpumask_var_node(&cfg
->domain
, GFP_ATOMIC
, node
)) {
203 } else if (!zalloc_cpumask_var_node(&cfg
->old_domain
,
205 free_cpumask_var(cfg
->domain
);
214 int arch_init_chip_data(struct irq_desc
*desc
, int node
)
218 cfg
= desc
->chip_data
;
220 desc
->chip_data
= get_one_free_irq_cfg(node
);
221 if (!desc
->chip_data
) {
222 printk(KERN_ERR
"can not alloc irq_cfg\n");
230 /* for move_irq_desc */
232 init_copy_irq_2_pin(struct irq_cfg
*old_cfg
, struct irq_cfg
*cfg
, int node
)
234 struct irq_pin_list
*old_entry
, *head
, *tail
, *entry
;
236 cfg
->irq_2_pin
= NULL
;
237 old_entry
= old_cfg
->irq_2_pin
;
241 entry
= get_one_free_irq_2_pin(node
);
245 entry
->apic
= old_entry
->apic
;
246 entry
->pin
= old_entry
->pin
;
249 old_entry
= old_entry
->next
;
251 entry
= get_one_free_irq_2_pin(node
);
259 /* still use the old one */
262 entry
->apic
= old_entry
->apic
;
263 entry
->pin
= old_entry
->pin
;
266 old_entry
= old_entry
->next
;
270 cfg
->irq_2_pin
= head
;
273 static void free_irq_2_pin(struct irq_cfg
*old_cfg
, struct irq_cfg
*cfg
)
275 struct irq_pin_list
*entry
, *next
;
277 if (old_cfg
->irq_2_pin
== cfg
->irq_2_pin
)
280 entry
= old_cfg
->irq_2_pin
;
287 old_cfg
->irq_2_pin
= NULL
;
290 void arch_init_copy_chip_data(struct irq_desc
*old_desc
,
291 struct irq_desc
*desc
, int node
)
294 struct irq_cfg
*old_cfg
;
296 cfg
= get_one_free_irq_cfg(node
);
301 desc
->chip_data
= cfg
;
303 old_cfg
= old_desc
->chip_data
;
305 memcpy(cfg
, old_cfg
, sizeof(struct irq_cfg
));
307 init_copy_irq_2_pin(old_cfg
, cfg
, node
);
310 static void free_irq_cfg(struct irq_cfg
*old_cfg
)
315 void arch_free_chip_data(struct irq_desc
*old_desc
, struct irq_desc
*desc
)
317 struct irq_cfg
*old_cfg
, *cfg
;
319 old_cfg
= old_desc
->chip_data
;
320 cfg
= desc
->chip_data
;
326 free_irq_2_pin(old_cfg
, cfg
);
327 free_irq_cfg(old_cfg
);
328 old_desc
->chip_data
= NULL
;
331 /* end for move_irq_desc */
334 struct irq_cfg
*irq_cfg(unsigned int irq
)
336 return irq
< nr_irqs
? irq_cfgx
+ irq
: NULL
;
343 unsigned int unused
[3];
345 unsigned int unused2
[11];
349 static __attribute_const__
struct io_apic __iomem
*io_apic_base(int idx
)
351 return (void __iomem
*) __fix_to_virt(FIX_IO_APIC_BASE_0
+ idx
)
352 + (mp_ioapics
[idx
].apicaddr
& ~PAGE_MASK
);
355 static inline void io_apic_eoi(unsigned int apic
, unsigned int vector
)
357 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
358 writel(vector
, &io_apic
->eoi
);
361 static inline unsigned int io_apic_read(unsigned int apic
, unsigned int reg
)
363 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
364 writel(reg
, &io_apic
->index
);
365 return readl(&io_apic
->data
);
368 static inline void io_apic_write(unsigned int apic
, unsigned int reg
, unsigned int value
)
370 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
371 writel(reg
, &io_apic
->index
);
372 writel(value
, &io_apic
->data
);
376 * Re-write a value: to be used for read-modify-write
377 * cycles where the read already set up the index register.
379 * Older SiS APIC requires we rewrite the index register
381 static inline void io_apic_modify(unsigned int apic
, unsigned int reg
, unsigned int value
)
383 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
386 writel(reg
, &io_apic
->index
);
387 writel(value
, &io_apic
->data
);
390 static bool io_apic_level_ack_pending(struct irq_cfg
*cfg
)
392 struct irq_pin_list
*entry
;
395 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
396 for_each_irq_pin(entry
, cfg
->irq_2_pin
) {
401 reg
= io_apic_read(entry
->apic
, 0x10 + pin
*2);
402 /* Is the remote IRR bit set? */
403 if (reg
& IO_APIC_REDIR_REMOTE_IRR
) {
404 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
408 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
414 struct { u32 w1
, w2
; };
415 struct IO_APIC_route_entry entry
;
418 static struct IO_APIC_route_entry
ioapic_read_entry(int apic
, int pin
)
420 union entry_union eu
;
422 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
423 eu
.w1
= io_apic_read(apic
, 0x10 + 2 * pin
);
424 eu
.w2
= io_apic_read(apic
, 0x11 + 2 * pin
);
425 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
430 * When we write a new IO APIC routing entry, we need to write the high
431 * word first! If the mask bit in the low word is clear, we will enable
432 * the interrupt, and we need to make sure the entry is fully populated
433 * before that happens.
436 __ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
438 union entry_union eu
= {{0, 0}};
441 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
442 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
445 void ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
448 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
449 __ioapic_write_entry(apic
, pin
, e
);
450 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
454 * When we mask an IO APIC routing entry, we need to write the low
455 * word first, in order to set the mask bit before we change the
458 static void ioapic_mask_entry(int apic
, int pin
)
461 union entry_union eu
= { .entry
.mask
= 1 };
463 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
464 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
465 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
466 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
470 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
471 * shared ISA-space IRQs, so we have to support them. We are super
472 * fast in the common case, and fast for shared ISA-space IRQs.
475 add_pin_to_irq_node_nopanic(struct irq_cfg
*cfg
, int node
, int apic
, int pin
)
477 struct irq_pin_list
**last
, *entry
;
479 /* don't allow duplicates */
480 last
= &cfg
->irq_2_pin
;
481 for_each_irq_pin(entry
, cfg
->irq_2_pin
) {
482 if (entry
->apic
== apic
&& entry
->pin
== pin
)
487 entry
= get_one_free_irq_2_pin(node
);
489 printk(KERN_ERR
"can not alloc irq_pin_list (%d,%d,%d)\n",
500 static void add_pin_to_irq_node(struct irq_cfg
*cfg
, int node
, int apic
, int pin
)
502 if (add_pin_to_irq_node_nopanic(cfg
, node
, apic
, pin
))
503 panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
507 * Reroute an IRQ to a different pin.
509 static void __init
replace_pin_at_irq_node(struct irq_cfg
*cfg
, int node
,
510 int oldapic
, int oldpin
,
511 int newapic
, int newpin
)
513 struct irq_pin_list
*entry
;
515 for_each_irq_pin(entry
, cfg
->irq_2_pin
) {
516 if (entry
->apic
== oldapic
&& entry
->pin
== oldpin
) {
517 entry
->apic
= newapic
;
519 /* every one is different, right? */
524 /* old apic/pin didn't exist, so just add new ones */
525 add_pin_to_irq_node(cfg
, node
, newapic
, newpin
);
528 static void __io_apic_modify_irq(struct irq_pin_list
*entry
,
529 int mask_and
, int mask_or
,
530 void (*final
)(struct irq_pin_list
*entry
))
532 unsigned int reg
, pin
;
535 reg
= io_apic_read(entry
->apic
, 0x10 + pin
* 2);
538 io_apic_modify(entry
->apic
, 0x10 + pin
* 2, reg
);
543 static void io_apic_modify_irq(struct irq_cfg
*cfg
,
544 int mask_and
, int mask_or
,
545 void (*final
)(struct irq_pin_list
*entry
))
547 struct irq_pin_list
*entry
;
549 for_each_irq_pin(entry
, cfg
->irq_2_pin
)
550 __io_apic_modify_irq(entry
, mask_and
, mask_or
, final
);
553 static void __mask_and_edge_IO_APIC_irq(struct irq_pin_list
*entry
)
555 __io_apic_modify_irq(entry
, ~IO_APIC_REDIR_LEVEL_TRIGGER
,
556 IO_APIC_REDIR_MASKED
, NULL
);
559 static void __unmask_and_level_IO_APIC_irq(struct irq_pin_list
*entry
)
561 __io_apic_modify_irq(entry
, ~IO_APIC_REDIR_MASKED
,
562 IO_APIC_REDIR_LEVEL_TRIGGER
, NULL
);
565 static void __unmask_IO_APIC_irq(struct irq_cfg
*cfg
)
567 io_apic_modify_irq(cfg
, ~IO_APIC_REDIR_MASKED
, 0, NULL
);
570 static void io_apic_sync(struct irq_pin_list
*entry
)
573 * Synchronize the IO-APIC and the CPU by doing
574 * a dummy read from the IO-APIC
576 struct io_apic __iomem
*io_apic
;
577 io_apic
= io_apic_base(entry
->apic
);
578 readl(&io_apic
->data
);
581 static void __mask_IO_APIC_irq(struct irq_cfg
*cfg
)
583 io_apic_modify_irq(cfg
, ~0, IO_APIC_REDIR_MASKED
, &io_apic_sync
);
586 static void mask_IO_APIC_irq_desc(struct irq_desc
*desc
)
588 struct irq_cfg
*cfg
= desc
->chip_data
;
593 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
594 __mask_IO_APIC_irq(cfg
);
595 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
598 static void unmask_IO_APIC_irq_desc(struct irq_desc
*desc
)
600 struct irq_cfg
*cfg
= desc
->chip_data
;
603 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
604 __unmask_IO_APIC_irq(cfg
);
605 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
608 static void mask_IO_APIC_irq(unsigned int irq
)
610 struct irq_desc
*desc
= irq_to_desc(irq
);
612 mask_IO_APIC_irq_desc(desc
);
614 static void unmask_IO_APIC_irq(unsigned int irq
)
616 struct irq_desc
*desc
= irq_to_desc(irq
);
618 unmask_IO_APIC_irq_desc(desc
);
621 static void clear_IO_APIC_pin(unsigned int apic
, unsigned int pin
)
623 struct IO_APIC_route_entry entry
;
625 /* Check delivery_mode to be sure we're not clearing an SMI pin */
626 entry
= ioapic_read_entry(apic
, pin
);
627 if (entry
.delivery_mode
== dest_SMI
)
630 * Disable it in the IO-APIC irq-routing table:
632 ioapic_mask_entry(apic
, pin
);
635 static void clear_IO_APIC (void)
639 for (apic
= 0; apic
< nr_ioapics
; apic
++)
640 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++)
641 clear_IO_APIC_pin(apic
, pin
);
646 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
647 * specific CPU-side IRQs.
651 static int pirq_entries
[MAX_PIRQS
] = {
652 [0 ... MAX_PIRQS
- 1] = -1
655 static int __init
ioapic_pirq_setup(char *str
)
658 int ints
[MAX_PIRQS
+1];
660 get_options(str
, ARRAY_SIZE(ints
), ints
);
662 apic_printk(APIC_VERBOSE
, KERN_INFO
663 "PIRQ redirection, working around broken MP-BIOS.\n");
665 if (ints
[0] < MAX_PIRQS
)
668 for (i
= 0; i
< max
; i
++) {
669 apic_printk(APIC_VERBOSE
, KERN_DEBUG
670 "... PIRQ%d -> IRQ %d\n", i
, ints
[i
+1]);
672 * PIRQs are mapped upside down, usually.
674 pirq_entries
[MAX_PIRQS
-i
-1] = ints
[i
+1];
679 __setup("pirq=", ioapic_pirq_setup
);
680 #endif /* CONFIG_X86_32 */
682 struct IO_APIC_route_entry
**alloc_ioapic_entries(void)
685 struct IO_APIC_route_entry
**ioapic_entries
;
687 ioapic_entries
= kzalloc(sizeof(*ioapic_entries
) * nr_ioapics
,
692 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
693 ioapic_entries
[apic
] =
694 kzalloc(sizeof(struct IO_APIC_route_entry
) *
695 nr_ioapic_registers
[apic
], GFP_ATOMIC
);
696 if (!ioapic_entries
[apic
])
700 return ioapic_entries
;
704 kfree(ioapic_entries
[apic
]);
705 kfree(ioapic_entries
);
711 * Saves all the IO-APIC RTE's
713 int save_IO_APIC_setup(struct IO_APIC_route_entry
**ioapic_entries
)
720 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
721 if (!ioapic_entries
[apic
])
724 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++)
725 ioapic_entries
[apic
][pin
] =
726 ioapic_read_entry(apic
, pin
);
733 * Mask all IO APIC entries.
735 void mask_IO_APIC_setup(struct IO_APIC_route_entry
**ioapic_entries
)
742 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
743 if (!ioapic_entries
[apic
])
746 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
747 struct IO_APIC_route_entry entry
;
749 entry
= ioapic_entries
[apic
][pin
];
752 ioapic_write_entry(apic
, pin
, entry
);
759 * Restore IO APIC entries which was saved in ioapic_entries.
761 int restore_IO_APIC_setup(struct IO_APIC_route_entry
**ioapic_entries
)
768 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
769 if (!ioapic_entries
[apic
])
772 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++)
773 ioapic_write_entry(apic
, pin
,
774 ioapic_entries
[apic
][pin
]);
779 void free_ioapic_entries(struct IO_APIC_route_entry
**ioapic_entries
)
783 for (apic
= 0; apic
< nr_ioapics
; apic
++)
784 kfree(ioapic_entries
[apic
]);
786 kfree(ioapic_entries
);
790 * Find the IRQ entry number of a certain pin.
792 static int find_irq_entry(int apic
, int pin
, int type
)
796 for (i
= 0; i
< mp_irq_entries
; i
++)
797 if (mp_irqs
[i
].irqtype
== type
&&
798 (mp_irqs
[i
].dstapic
== mp_ioapics
[apic
].apicid
||
799 mp_irqs
[i
].dstapic
== MP_APIC_ALL
) &&
800 mp_irqs
[i
].dstirq
== pin
)
807 * Find the pin to which IRQ[irq] (ISA) is connected
809 static int __init
find_isa_irq_pin(int irq
, int type
)
813 for (i
= 0; i
< mp_irq_entries
; i
++) {
814 int lbus
= mp_irqs
[i
].srcbus
;
816 if (test_bit(lbus
, mp_bus_not_pci
) &&
817 (mp_irqs
[i
].irqtype
== type
) &&
818 (mp_irqs
[i
].srcbusirq
== irq
))
820 return mp_irqs
[i
].dstirq
;
825 static int __init
find_isa_irq_apic(int irq
, int type
)
829 for (i
= 0; i
< mp_irq_entries
; i
++) {
830 int lbus
= mp_irqs
[i
].srcbus
;
832 if (test_bit(lbus
, mp_bus_not_pci
) &&
833 (mp_irqs
[i
].irqtype
== type
) &&
834 (mp_irqs
[i
].srcbusirq
== irq
))
837 if (i
< mp_irq_entries
) {
839 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
840 if (mp_ioapics
[apic
].apicid
== mp_irqs
[i
].dstapic
)
848 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
850 * EISA Edge/Level control register, ELCR
852 static int EISA_ELCR(unsigned int irq
)
854 if (irq
< legacy_pic
->nr_legacy_irqs
) {
855 unsigned int port
= 0x4d0 + (irq
>> 3);
856 return (inb(port
) >> (irq
& 7)) & 1;
858 apic_printk(APIC_VERBOSE
, KERN_INFO
859 "Broken MPtable reports ISA irq %d\n", irq
);
865 /* ISA interrupts are always polarity zero edge triggered,
866 * when listed as conforming in the MP table. */
868 #define default_ISA_trigger(idx) (0)
869 #define default_ISA_polarity(idx) (0)
871 /* EISA interrupts are always polarity zero and can be edge or level
872 * trigger depending on the ELCR value. If an interrupt is listed as
873 * EISA conforming in the MP table, that means its trigger type must
874 * be read in from the ELCR */
876 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
877 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
879 /* PCI interrupts are always polarity one level triggered,
880 * when listed as conforming in the MP table. */
882 #define default_PCI_trigger(idx) (1)
883 #define default_PCI_polarity(idx) (1)
885 /* MCA interrupts are always polarity zero level triggered,
886 * when listed as conforming in the MP table. */
888 #define default_MCA_trigger(idx) (1)
889 #define default_MCA_polarity(idx) default_ISA_polarity(idx)
891 static int MPBIOS_polarity(int idx
)
893 int bus
= mp_irqs
[idx
].srcbus
;
897 * Determine IRQ line polarity (high active or low active):
899 switch (mp_irqs
[idx
].irqflag
& 3)
901 case 0: /* conforms, ie. bus-type dependent polarity */
902 if (test_bit(bus
, mp_bus_not_pci
))
903 polarity
= default_ISA_polarity(idx
);
905 polarity
= default_PCI_polarity(idx
);
907 case 1: /* high active */
912 case 2: /* reserved */
914 printk(KERN_WARNING
"broken BIOS!!\n");
918 case 3: /* low active */
923 default: /* invalid */
925 printk(KERN_WARNING
"broken BIOS!!\n");
933 static int MPBIOS_trigger(int idx
)
935 int bus
= mp_irqs
[idx
].srcbus
;
939 * Determine IRQ trigger mode (edge or level sensitive):
941 switch ((mp_irqs
[idx
].irqflag
>>2) & 3)
943 case 0: /* conforms, ie. bus-type dependent */
944 if (test_bit(bus
, mp_bus_not_pci
))
945 trigger
= default_ISA_trigger(idx
);
947 trigger
= default_PCI_trigger(idx
);
948 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
949 switch (mp_bus_id_to_type
[bus
]) {
950 case MP_BUS_ISA
: /* ISA pin */
952 /* set before the switch */
955 case MP_BUS_EISA
: /* EISA pin */
957 trigger
= default_EISA_trigger(idx
);
960 case MP_BUS_PCI
: /* PCI pin */
962 /* set before the switch */
965 case MP_BUS_MCA
: /* MCA pin */
967 trigger
= default_MCA_trigger(idx
);
972 printk(KERN_WARNING
"broken BIOS!!\n");
984 case 2: /* reserved */
986 printk(KERN_WARNING
"broken BIOS!!\n");
995 default: /* invalid */
997 printk(KERN_WARNING
"broken BIOS!!\n");
1005 static inline int irq_polarity(int idx
)
1007 return MPBIOS_polarity(idx
);
1010 static inline int irq_trigger(int idx
)
1012 return MPBIOS_trigger(idx
);
1015 int (*ioapic_renumber_irq
)(int ioapic
, int irq
);
1016 static int pin_2_irq(int idx
, int apic
, int pin
)
1019 int bus
= mp_irqs
[idx
].srcbus
;
1022 * Debugging check, we are in big trouble if this message pops up!
1024 if (mp_irqs
[idx
].dstirq
!= pin
)
1025 printk(KERN_ERR
"broken BIOS or MPTABLE parser, ayiee!!\n");
1027 if (test_bit(bus
, mp_bus_not_pci
)) {
1028 irq
= mp_irqs
[idx
].srcbusirq
;
1031 * PCI IRQs are mapped in order
1035 irq
+= nr_ioapic_registers
[i
++];
1038 * For MPS mode, so far only needed by ES7000 platform
1040 if (ioapic_renumber_irq
)
1041 irq
= ioapic_renumber_irq(apic
, irq
);
1044 #ifdef CONFIG_X86_32
1046 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1048 if ((pin
>= 16) && (pin
<= 23)) {
1049 if (pirq_entries
[pin
-16] != -1) {
1050 if (!pirq_entries
[pin
-16]) {
1051 apic_printk(APIC_VERBOSE
, KERN_DEBUG
1052 "disabling PIRQ%d\n", pin
-16);
1054 irq
= pirq_entries
[pin
-16];
1055 apic_printk(APIC_VERBOSE
, KERN_DEBUG
1056 "using PIRQ%d -> IRQ %d\n",
1067 * Find a specific PCI IRQ entry.
1068 * Not an __init, possibly needed by modules
1070 int IO_APIC_get_PCI_irq_vector(int bus
, int slot
, int pin
,
1071 struct io_apic_irq_attr
*irq_attr
)
1073 int apic
, i
, best_guess
= -1;
1075 apic_printk(APIC_DEBUG
,
1076 "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
1078 if (test_bit(bus
, mp_bus_not_pci
)) {
1079 apic_printk(APIC_VERBOSE
,
1080 "PCI BIOS passed nonexistent PCI bus %d!\n", bus
);
1083 for (i
= 0; i
< mp_irq_entries
; i
++) {
1084 int lbus
= mp_irqs
[i
].srcbus
;
1086 for (apic
= 0; apic
< nr_ioapics
; apic
++)
1087 if (mp_ioapics
[apic
].apicid
== mp_irqs
[i
].dstapic
||
1088 mp_irqs
[i
].dstapic
== MP_APIC_ALL
)
1091 if (!test_bit(lbus
, mp_bus_not_pci
) &&
1092 !mp_irqs
[i
].irqtype
&&
1094 (slot
== ((mp_irqs
[i
].srcbusirq
>> 2) & 0x1f))) {
1095 int irq
= pin_2_irq(i
, apic
, mp_irqs
[i
].dstirq
);
1097 if (!(apic
|| IO_APIC_IRQ(irq
)))
1100 if (pin
== (mp_irqs
[i
].srcbusirq
& 3)) {
1101 set_io_apic_irq_attr(irq_attr
, apic
,
1108 * Use the first all-but-pin matching entry as a
1109 * best-guess fuzzy result for broken mptables.
1111 if (best_guess
< 0) {
1112 set_io_apic_irq_attr(irq_attr
, apic
,
1122 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector
);
1124 void lock_vector_lock(void)
1126 /* Used to the online set of cpus does not change
1127 * during assign_irq_vector.
1129 raw_spin_lock(&vector_lock
);
1132 void unlock_vector_lock(void)
1134 raw_spin_unlock(&vector_lock
);
1138 __assign_irq_vector(int irq
, struct irq_cfg
*cfg
, const struct cpumask
*mask
)
1141 * NOTE! The local APIC isn't very good at handling
1142 * multiple interrupts at the same interrupt level.
1143 * As the interrupt level is determined by taking the
1144 * vector number and shifting that right by 4, we
1145 * want to spread these out a bit so that they don't
1146 * all fall in the same interrupt level.
1148 * Also, we've got to be careful not to trash gate
1149 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1151 static int current_vector
= FIRST_EXTERNAL_VECTOR
+ VECTOR_OFFSET_START
;
1152 static int current_offset
= VECTOR_OFFSET_START
% 8;
1153 unsigned int old_vector
;
1155 cpumask_var_t tmp_mask
;
1157 if (cfg
->move_in_progress
)
1160 if (!alloc_cpumask_var(&tmp_mask
, GFP_ATOMIC
))
1163 old_vector
= cfg
->vector
;
1165 cpumask_and(tmp_mask
, mask
, cpu_online_mask
);
1166 cpumask_and(tmp_mask
, cfg
->domain
, tmp_mask
);
1167 if (!cpumask_empty(tmp_mask
)) {
1168 free_cpumask_var(tmp_mask
);
1173 /* Only try and allocate irqs on cpus that are present */
1175 for_each_cpu_and(cpu
, mask
, cpu_online_mask
) {
1179 apic
->vector_allocation_domain(cpu
, tmp_mask
);
1181 vector
= current_vector
;
1182 offset
= current_offset
;
1185 if (vector
>= first_system_vector
) {
1186 /* If out of vectors on large boxen, must share them. */
1187 offset
= (offset
+ 1) % 8;
1188 vector
= FIRST_EXTERNAL_VECTOR
+ offset
;
1190 if (unlikely(current_vector
== vector
))
1193 if (test_bit(vector
, used_vectors
))
1196 for_each_cpu_and(new_cpu
, tmp_mask
, cpu_online_mask
)
1197 if (per_cpu(vector_irq
, new_cpu
)[vector
] != -1)
1200 current_vector
= vector
;
1201 current_offset
= offset
;
1203 cfg
->move_in_progress
= 1;
1204 cpumask_copy(cfg
->old_domain
, cfg
->domain
);
1206 for_each_cpu_and(new_cpu
, tmp_mask
, cpu_online_mask
)
1207 per_cpu(vector_irq
, new_cpu
)[vector
] = irq
;
1208 cfg
->vector
= vector
;
1209 cpumask_copy(cfg
->domain
, tmp_mask
);
1213 free_cpumask_var(tmp_mask
);
1217 int assign_irq_vector(int irq
, struct irq_cfg
*cfg
, const struct cpumask
*mask
)
1220 unsigned long flags
;
1222 raw_spin_lock_irqsave(&vector_lock
, flags
);
1223 err
= __assign_irq_vector(irq
, cfg
, mask
);
1224 raw_spin_unlock_irqrestore(&vector_lock
, flags
);
1228 static void __clear_irq_vector(int irq
, struct irq_cfg
*cfg
)
1232 BUG_ON(!cfg
->vector
);
1234 vector
= cfg
->vector
;
1235 for_each_cpu_and(cpu
, cfg
->domain
, cpu_online_mask
)
1236 per_cpu(vector_irq
, cpu
)[vector
] = -1;
1239 cpumask_clear(cfg
->domain
);
1241 if (likely(!cfg
->move_in_progress
))
1243 for_each_cpu_and(cpu
, cfg
->old_domain
, cpu_online_mask
) {
1244 for (vector
= FIRST_EXTERNAL_VECTOR
; vector
< NR_VECTORS
;
1246 if (per_cpu(vector_irq
, cpu
)[vector
] != irq
)
1248 per_cpu(vector_irq
, cpu
)[vector
] = -1;
1252 cfg
->move_in_progress
= 0;
1255 void __setup_vector_irq(int cpu
)
1257 /* Initialize vector_irq on a new cpu */
1259 struct irq_cfg
*cfg
;
1260 struct irq_desc
*desc
;
1263 * vector_lock will make sure that we don't run into irq vector
1264 * assignments that might be happening on another cpu in parallel,
1265 * while we setup our initial vector to irq mappings.
1267 raw_spin_lock(&vector_lock
);
1268 /* Mark the inuse vectors */
1269 for_each_irq_desc(irq
, desc
) {
1270 cfg
= desc
->chip_data
;
1273 * If it is a legacy IRQ handled by the legacy PIC, this cpu
1274 * will be part of the irq_cfg's domain.
1276 if (irq
< legacy_pic
->nr_legacy_irqs
&& !IO_APIC_IRQ(irq
))
1277 cpumask_set_cpu(cpu
, cfg
->domain
);
1279 if (!cpumask_test_cpu(cpu
, cfg
->domain
))
1281 vector
= cfg
->vector
;
1282 per_cpu(vector_irq
, cpu
)[vector
] = irq
;
1284 /* Mark the free vectors */
1285 for (vector
= 0; vector
< NR_VECTORS
; ++vector
) {
1286 irq
= per_cpu(vector_irq
, cpu
)[vector
];
1291 if (!cpumask_test_cpu(cpu
, cfg
->domain
))
1292 per_cpu(vector_irq
, cpu
)[vector
] = -1;
1294 raw_spin_unlock(&vector_lock
);
1297 static struct irq_chip ioapic_chip
;
1298 static struct irq_chip ir_ioapic_chip
;
1300 #define IOAPIC_AUTO -1
1301 #define IOAPIC_EDGE 0
1302 #define IOAPIC_LEVEL 1
1304 #ifdef CONFIG_X86_32
1305 static inline int IO_APIC_irq_trigger(int irq
)
1309 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1310 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1311 idx
= find_irq_entry(apic
, pin
, mp_INT
);
1312 if ((idx
!= -1) && (irq
== pin_2_irq(idx
, apic
, pin
)))
1313 return irq_trigger(idx
);
1317 * nonexistent IRQs are edge default
1322 static inline int IO_APIC_irq_trigger(int irq
)
1328 static void ioapic_register_intr(int irq
, struct irq_desc
*desc
, unsigned long trigger
)
1331 if ((trigger
== IOAPIC_AUTO
&& IO_APIC_irq_trigger(irq
)) ||
1332 trigger
== IOAPIC_LEVEL
)
1333 desc
->status
|= IRQ_LEVEL
;
1335 desc
->status
&= ~IRQ_LEVEL
;
1337 if (irq_remapped(irq
)) {
1338 desc
->status
|= IRQ_MOVE_PCNTXT
;
1340 set_irq_chip_and_handler_name(irq
, &ir_ioapic_chip
,
1344 set_irq_chip_and_handler_name(irq
, &ir_ioapic_chip
,
1345 handle_edge_irq
, "edge");
1349 if ((trigger
== IOAPIC_AUTO
&& IO_APIC_irq_trigger(irq
)) ||
1350 trigger
== IOAPIC_LEVEL
)
1351 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
1355 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
1356 handle_edge_irq
, "edge");
1359 int setup_ioapic_entry(int apic_id
, int irq
,
1360 struct IO_APIC_route_entry
*entry
,
1361 unsigned int destination
, int trigger
,
1362 int polarity
, int vector
, int pin
)
1365 * add it to the IO-APIC irq-routing table:
1367 memset(entry
,0,sizeof(*entry
));
1369 if (intr_remapping_enabled
) {
1370 struct intel_iommu
*iommu
= map_ioapic_to_ir(apic_id
);
1372 struct IR_IO_APIC_route_entry
*ir_entry
=
1373 (struct IR_IO_APIC_route_entry
*) entry
;
1377 panic("No mapping iommu for ioapic %d\n", apic_id
);
1379 index
= alloc_irte(iommu
, irq
, 1);
1381 panic("Failed to allocate IRTE for ioapic %d\n", apic_id
);
1383 memset(&irte
, 0, sizeof(irte
));
1386 irte
.dst_mode
= apic
->irq_dest_mode
;
1388 * Trigger mode in the IRTE will always be edge, and the
1389 * actual level or edge trigger will be setup in the IO-APIC
1390 * RTE. This will help simplify level triggered irq migration.
1391 * For more details, see the comments above explainig IO-APIC
1392 * irq migration in the presence of interrupt-remapping.
1394 irte
.trigger_mode
= 0;
1395 irte
.dlvry_mode
= apic
->irq_delivery_mode
;
1396 irte
.vector
= vector
;
1397 irte
.dest_id
= IRTE_DEST(destination
);
1399 /* Set source-id of interrupt request */
1400 set_ioapic_sid(&irte
, apic_id
);
1402 modify_irte(irq
, &irte
);
1404 ir_entry
->index2
= (index
>> 15) & 0x1;
1406 ir_entry
->format
= 1;
1407 ir_entry
->index
= (index
& 0x7fff);
1409 * IO-APIC RTE will be configured with virtual vector.
1410 * irq handler will do the explicit EOI to the io-apic.
1412 ir_entry
->vector
= pin
;
1414 entry
->delivery_mode
= apic
->irq_delivery_mode
;
1415 entry
->dest_mode
= apic
->irq_dest_mode
;
1416 entry
->dest
= destination
;
1417 entry
->vector
= vector
;
1420 entry
->mask
= 0; /* enable IRQ */
1421 entry
->trigger
= trigger
;
1422 entry
->polarity
= polarity
;
1424 /* Mask level triggered irqs.
1425 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
1432 static void setup_IO_APIC_irq(int apic_id
, int pin
, unsigned int irq
, struct irq_desc
*desc
,
1433 int trigger
, int polarity
)
1435 struct irq_cfg
*cfg
;
1436 struct IO_APIC_route_entry entry
;
1439 if (!IO_APIC_IRQ(irq
))
1442 cfg
= desc
->chip_data
;
1445 * For legacy irqs, cfg->domain starts with cpu 0 for legacy
1446 * controllers like 8259. Now that IO-APIC can handle this irq, update
1449 if (irq
< legacy_pic
->nr_legacy_irqs
&& cpumask_test_cpu(0, cfg
->domain
))
1450 apic
->vector_allocation_domain(0, cfg
->domain
);
1452 if (assign_irq_vector(irq
, cfg
, apic
->target_cpus()))
1455 dest
= apic
->cpu_mask_to_apicid_and(cfg
->domain
, apic
->target_cpus());
1457 apic_printk(APIC_VERBOSE
,KERN_DEBUG
1458 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
1459 "IRQ %d Mode:%i Active:%i)\n",
1460 apic_id
, mp_ioapics
[apic_id
].apicid
, pin
, cfg
->vector
,
1461 irq
, trigger
, polarity
);
1464 if (setup_ioapic_entry(mp_ioapics
[apic_id
].apicid
, irq
, &entry
,
1465 dest
, trigger
, polarity
, cfg
->vector
, pin
)) {
1466 printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
1467 mp_ioapics
[apic_id
].apicid
, pin
);
1468 __clear_irq_vector(irq
, cfg
);
1472 ioapic_register_intr(irq
, desc
, trigger
);
1473 if (irq
< legacy_pic
->nr_legacy_irqs
)
1474 legacy_pic
->chip
->mask(irq
);
1476 ioapic_write_entry(apic_id
, pin
, entry
);
1480 DECLARE_BITMAP(pin_programmed
, MP_MAX_IOAPIC_PIN
+ 1);
1481 } mp_ioapic_routing
[MAX_IO_APICS
];
1483 static void __init
setup_IO_APIC_irqs(void)
1485 int apic_id
, pin
, idx
, irq
;
1487 struct irq_desc
*desc
;
1488 struct irq_cfg
*cfg
;
1489 int node
= cpu_to_node(boot_cpu_id
);
1491 apic_printk(APIC_VERBOSE
, KERN_DEBUG
"init IO_APIC IRQs\n");
1493 for (apic_id
= 0; apic_id
< nr_ioapics
; apic_id
++)
1494 for (pin
= 0; pin
< nr_ioapic_registers
[apic_id
]; pin
++) {
1495 idx
= find_irq_entry(apic_id
, pin
, mp_INT
);
1499 apic_printk(APIC_VERBOSE
,
1500 KERN_DEBUG
" %d-%d",
1501 mp_ioapics
[apic_id
].apicid
, pin
);
1503 apic_printk(APIC_VERBOSE
, " %d-%d",
1504 mp_ioapics
[apic_id
].apicid
, pin
);
1508 apic_printk(APIC_VERBOSE
,
1509 " (apicid-pin) not connected\n");
1513 irq
= pin_2_irq(idx
, apic_id
, pin
);
1515 if ((apic_id
> 0) && (irq
> 16))
1519 * Skip the timer IRQ if there's a quirk handler
1520 * installed and if it returns 1:
1522 if (apic
->multi_timer_check
&&
1523 apic
->multi_timer_check(apic_id
, irq
))
1526 desc
= irq_to_desc_alloc_node(irq
, node
);
1528 printk(KERN_INFO
"can not get irq_desc for %d\n", irq
);
1531 cfg
= desc
->chip_data
;
1532 add_pin_to_irq_node(cfg
, node
, apic_id
, pin
);
1534 * don't mark it in pin_programmed, so later acpi could
1535 * set it correctly when irq < 16
1537 setup_IO_APIC_irq(apic_id
, pin
, irq
, desc
,
1538 irq_trigger(idx
), irq_polarity(idx
));
1542 apic_printk(APIC_VERBOSE
,
1543 " (apicid-pin) not connected\n");
1547 * for the gsit that is not in first ioapic
1548 * but could not use acpi_register_gsi()
1549 * like some special sci in IBM x3330
1551 void setup_IO_APIC_irq_extra(u32 gsi
)
1553 int apic_id
= 0, pin
, idx
, irq
;
1554 int node
= cpu_to_node(boot_cpu_id
);
1555 struct irq_desc
*desc
;
1556 struct irq_cfg
*cfg
;
1559 * Convert 'gsi' to 'ioapic.pin'.
1561 apic_id
= mp_find_ioapic(gsi
);
1565 pin
= mp_find_ioapic_pin(apic_id
, gsi
);
1566 idx
= find_irq_entry(apic_id
, pin
, mp_INT
);
1570 irq
= pin_2_irq(idx
, apic_id
, pin
);
1571 #ifdef CONFIG_SPARSE_IRQ
1572 desc
= irq_to_desc(irq
);
1576 desc
= irq_to_desc_alloc_node(irq
, node
);
1578 printk(KERN_INFO
"can not get irq_desc for %d\n", irq
);
1582 cfg
= desc
->chip_data
;
1583 add_pin_to_irq_node(cfg
, node
, apic_id
, pin
);
1585 if (test_bit(pin
, mp_ioapic_routing
[apic_id
].pin_programmed
)) {
1586 pr_debug("Pin %d-%d already programmed\n",
1587 mp_ioapics
[apic_id
].apicid
, pin
);
1590 set_bit(pin
, mp_ioapic_routing
[apic_id
].pin_programmed
);
1592 setup_IO_APIC_irq(apic_id
, pin
, irq
, desc
,
1593 irq_trigger(idx
), irq_polarity(idx
));
1597 * Set up the timer pin, possibly with the 8259A-master behind.
1599 static void __init
setup_timer_IRQ0_pin(unsigned int apic_id
, unsigned int pin
,
1602 struct IO_APIC_route_entry entry
;
1604 if (intr_remapping_enabled
)
1607 memset(&entry
, 0, sizeof(entry
));
1610 * We use logical delivery to get the timer IRQ
1613 entry
.dest_mode
= apic
->irq_dest_mode
;
1614 entry
.mask
= 0; /* don't mask IRQ for edge */
1615 entry
.dest
= apic
->cpu_mask_to_apicid(apic
->target_cpus());
1616 entry
.delivery_mode
= apic
->irq_delivery_mode
;
1619 entry
.vector
= vector
;
1622 * The timer IRQ doesn't have to know that behind the
1623 * scene we may have a 8259A-master in AEOI mode ...
1625 set_irq_chip_and_handler_name(0, &ioapic_chip
, handle_edge_irq
, "edge");
1628 * Add it to the IO-APIC irq-routing table:
1630 ioapic_write_entry(apic_id
, pin
, entry
);
1634 __apicdebuginit(void) print_IO_APIC(void)
1637 union IO_APIC_reg_00 reg_00
;
1638 union IO_APIC_reg_01 reg_01
;
1639 union IO_APIC_reg_02 reg_02
;
1640 union IO_APIC_reg_03 reg_03
;
1641 unsigned long flags
;
1642 struct irq_cfg
*cfg
;
1643 struct irq_desc
*desc
;
1646 printk(KERN_DEBUG
"number of MP IRQ sources: %d.\n", mp_irq_entries
);
1647 for (i
= 0; i
< nr_ioapics
; i
++)
1648 printk(KERN_DEBUG
"number of IO-APIC #%d registers: %d.\n",
1649 mp_ioapics
[i
].apicid
, nr_ioapic_registers
[i
]);
1652 * We are a bit conservative about what we expect. We have to
1653 * know about every hardware change ASAP.
1655 printk(KERN_INFO
"testing the IO APIC.......................\n");
1657 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1659 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
1660 reg_00
.raw
= io_apic_read(apic
, 0);
1661 reg_01
.raw
= io_apic_read(apic
, 1);
1662 if (reg_01
.bits
.version
>= 0x10)
1663 reg_02
.raw
= io_apic_read(apic
, 2);
1664 if (reg_01
.bits
.version
>= 0x20)
1665 reg_03
.raw
= io_apic_read(apic
, 3);
1666 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
1669 printk(KERN_DEBUG
"IO APIC #%d......\n", mp_ioapics
[apic
].apicid
);
1670 printk(KERN_DEBUG
".... register #00: %08X\n", reg_00
.raw
);
1671 printk(KERN_DEBUG
"....... : physical APIC id: %02X\n", reg_00
.bits
.ID
);
1672 printk(KERN_DEBUG
"....... : Delivery Type: %X\n", reg_00
.bits
.delivery_type
);
1673 printk(KERN_DEBUG
"....... : LTS : %X\n", reg_00
.bits
.LTS
);
1675 printk(KERN_DEBUG
".... register #01: %08X\n", *(int *)®_01
);
1676 printk(KERN_DEBUG
"....... : max redirection entries: %04X\n", reg_01
.bits
.entries
);
1678 printk(KERN_DEBUG
"....... : PRQ implemented: %X\n", reg_01
.bits
.PRQ
);
1679 printk(KERN_DEBUG
"....... : IO APIC version: %04X\n", reg_01
.bits
.version
);
1682 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1683 * but the value of reg_02 is read as the previous read register
1684 * value, so ignore it if reg_02 == reg_01.
1686 if (reg_01
.bits
.version
>= 0x10 && reg_02
.raw
!= reg_01
.raw
) {
1687 printk(KERN_DEBUG
".... register #02: %08X\n", reg_02
.raw
);
1688 printk(KERN_DEBUG
"....... : arbitration: %02X\n", reg_02
.bits
.arbitration
);
1692 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1693 * or reg_03, but the value of reg_0[23] is read as the previous read
1694 * register value, so ignore it if reg_03 == reg_0[12].
1696 if (reg_01
.bits
.version
>= 0x20 && reg_03
.raw
!= reg_02
.raw
&&
1697 reg_03
.raw
!= reg_01
.raw
) {
1698 printk(KERN_DEBUG
".... register #03: %08X\n", reg_03
.raw
);
1699 printk(KERN_DEBUG
"....... : Boot DT : %X\n", reg_03
.bits
.boot_DT
);
1702 printk(KERN_DEBUG
".... IRQ redirection table:\n");
1704 printk(KERN_DEBUG
" NR Dst Mask Trig IRR Pol"
1705 " Stat Dmod Deli Vect:\n");
1707 for (i
= 0; i
<= reg_01
.bits
.entries
; i
++) {
1708 struct IO_APIC_route_entry entry
;
1710 entry
= ioapic_read_entry(apic
, i
);
1712 printk(KERN_DEBUG
" %02x %03X ",
1717 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1722 entry
.delivery_status
,
1724 entry
.delivery_mode
,
1729 printk(KERN_DEBUG
"IRQ to pin mappings:\n");
1730 for_each_irq_desc(irq
, desc
) {
1731 struct irq_pin_list
*entry
;
1733 cfg
= desc
->chip_data
;
1734 entry
= cfg
->irq_2_pin
;
1737 printk(KERN_DEBUG
"IRQ%d ", irq
);
1738 for_each_irq_pin(entry
, cfg
->irq_2_pin
)
1739 printk("-> %d:%d", entry
->apic
, entry
->pin
);
1743 printk(KERN_INFO
".................................... done.\n");
1748 __apicdebuginit(void) print_APIC_field(int base
)
1754 for (i
= 0; i
< 8; i
++)
1755 printk(KERN_CONT
"%08x", apic_read(base
+ i
*0x10));
1757 printk(KERN_CONT
"\n");
1760 __apicdebuginit(void) print_local_APIC(void *dummy
)
1762 unsigned int i
, v
, ver
, maxlvt
;
1765 printk(KERN_DEBUG
"printing local APIC contents on CPU#%d/%d:\n",
1766 smp_processor_id(), hard_smp_processor_id());
1767 v
= apic_read(APIC_ID
);
1768 printk(KERN_INFO
"... APIC ID: %08x (%01x)\n", v
, read_apic_id());
1769 v
= apic_read(APIC_LVR
);
1770 printk(KERN_INFO
"... APIC VERSION: %08x\n", v
);
1771 ver
= GET_APIC_VERSION(v
);
1772 maxlvt
= lapic_get_maxlvt();
1774 v
= apic_read(APIC_TASKPRI
);
1775 printk(KERN_DEBUG
"... APIC TASKPRI: %08x (%02x)\n", v
, v
& APIC_TPRI_MASK
);
1777 if (APIC_INTEGRATED(ver
)) { /* !82489DX */
1778 if (!APIC_XAPIC(ver
)) {
1779 v
= apic_read(APIC_ARBPRI
);
1780 printk(KERN_DEBUG
"... APIC ARBPRI: %08x (%02x)\n", v
,
1781 v
& APIC_ARBPRI_MASK
);
1783 v
= apic_read(APIC_PROCPRI
);
1784 printk(KERN_DEBUG
"... APIC PROCPRI: %08x\n", v
);
1788 * Remote read supported only in the 82489DX and local APIC for
1789 * Pentium processors.
1791 if (!APIC_INTEGRATED(ver
) || maxlvt
== 3) {
1792 v
= apic_read(APIC_RRR
);
1793 printk(KERN_DEBUG
"... APIC RRR: %08x\n", v
);
1796 v
= apic_read(APIC_LDR
);
1797 printk(KERN_DEBUG
"... APIC LDR: %08x\n", v
);
1798 if (!x2apic_enabled()) {
1799 v
= apic_read(APIC_DFR
);
1800 printk(KERN_DEBUG
"... APIC DFR: %08x\n", v
);
1802 v
= apic_read(APIC_SPIV
);
1803 printk(KERN_DEBUG
"... APIC SPIV: %08x\n", v
);
1805 printk(KERN_DEBUG
"... APIC ISR field:\n");
1806 print_APIC_field(APIC_ISR
);
1807 printk(KERN_DEBUG
"... APIC TMR field:\n");
1808 print_APIC_field(APIC_TMR
);
1809 printk(KERN_DEBUG
"... APIC IRR field:\n");
1810 print_APIC_field(APIC_IRR
);
1812 if (APIC_INTEGRATED(ver
)) { /* !82489DX */
1813 if (maxlvt
> 3) /* Due to the Pentium erratum 3AP. */
1814 apic_write(APIC_ESR
, 0);
1816 v
= apic_read(APIC_ESR
);
1817 printk(KERN_DEBUG
"... APIC ESR: %08x\n", v
);
1820 icr
= apic_icr_read();
1821 printk(KERN_DEBUG
"... APIC ICR: %08x\n", (u32
)icr
);
1822 printk(KERN_DEBUG
"... APIC ICR2: %08x\n", (u32
)(icr
>> 32));
1824 v
= apic_read(APIC_LVTT
);
1825 printk(KERN_DEBUG
"... APIC LVTT: %08x\n", v
);
1827 if (maxlvt
> 3) { /* PC is LVT#4. */
1828 v
= apic_read(APIC_LVTPC
);
1829 printk(KERN_DEBUG
"... APIC LVTPC: %08x\n", v
);
1831 v
= apic_read(APIC_LVT0
);
1832 printk(KERN_DEBUG
"... APIC LVT0: %08x\n", v
);
1833 v
= apic_read(APIC_LVT1
);
1834 printk(KERN_DEBUG
"... APIC LVT1: %08x\n", v
);
1836 if (maxlvt
> 2) { /* ERR is LVT#3. */
1837 v
= apic_read(APIC_LVTERR
);
1838 printk(KERN_DEBUG
"... APIC LVTERR: %08x\n", v
);
1841 v
= apic_read(APIC_TMICT
);
1842 printk(KERN_DEBUG
"... APIC TMICT: %08x\n", v
);
1843 v
= apic_read(APIC_TMCCT
);
1844 printk(KERN_DEBUG
"... APIC TMCCT: %08x\n", v
);
1845 v
= apic_read(APIC_TDCR
);
1846 printk(KERN_DEBUG
"... APIC TDCR: %08x\n", v
);
1848 if (boot_cpu_has(X86_FEATURE_EXTAPIC
)) {
1849 v
= apic_read(APIC_EFEAT
);
1850 maxlvt
= (v
>> 16) & 0xff;
1851 printk(KERN_DEBUG
"... APIC EFEAT: %08x\n", v
);
1852 v
= apic_read(APIC_ECTRL
);
1853 printk(KERN_DEBUG
"... APIC ECTRL: %08x\n", v
);
1854 for (i
= 0; i
< maxlvt
; i
++) {
1855 v
= apic_read(APIC_EILVTn(i
));
1856 printk(KERN_DEBUG
"... APIC EILVT%d: %08x\n", i
, v
);
1862 __apicdebuginit(void) print_local_APICs(int maxcpu
)
1870 for_each_online_cpu(cpu
) {
1873 smp_call_function_single(cpu
, print_local_APIC
, NULL
, 1);
1878 __apicdebuginit(void) print_PIC(void)
1881 unsigned long flags
;
1883 if (!legacy_pic
->nr_legacy_irqs
)
1886 printk(KERN_DEBUG
"\nprinting PIC contents\n");
1888 raw_spin_lock_irqsave(&i8259A_lock
, flags
);
1890 v
= inb(0xa1) << 8 | inb(0x21);
1891 printk(KERN_DEBUG
"... PIC IMR: %04x\n", v
);
1893 v
= inb(0xa0) << 8 | inb(0x20);
1894 printk(KERN_DEBUG
"... PIC IRR: %04x\n", v
);
1898 v
= inb(0xa0) << 8 | inb(0x20);
1902 raw_spin_unlock_irqrestore(&i8259A_lock
, flags
);
1904 printk(KERN_DEBUG
"... PIC ISR: %04x\n", v
);
1906 v
= inb(0x4d1) << 8 | inb(0x4d0);
1907 printk(KERN_DEBUG
"... PIC ELCR: %04x\n", v
);
1910 static int __initdata show_lapic
= 1;
1911 static __init
int setup_show_lapic(char *arg
)
1915 if (strcmp(arg
, "all") == 0) {
1916 show_lapic
= CONFIG_NR_CPUS
;
1918 get_option(&arg
, &num
);
1925 __setup("show_lapic=", setup_show_lapic
);
1927 __apicdebuginit(int) print_ICs(void)
1929 if (apic_verbosity
== APIC_QUIET
)
1934 /* don't print out if apic is not there */
1935 if (!cpu_has_apic
&& !apic_from_smp_config())
1938 print_local_APICs(show_lapic
);
1944 fs_initcall(print_ICs
);
1947 /* Where if anywhere is the i8259 connect in external int mode */
1948 static struct { int pin
, apic
; } ioapic_i8259
= { -1, -1 };
1950 void __init
enable_IO_APIC(void)
1952 union IO_APIC_reg_01 reg_01
;
1953 int i8259_apic
, i8259_pin
;
1955 unsigned long flags
;
1958 * The number of IO-APIC IRQ registers (== #pins):
1960 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1961 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
1962 reg_01
.raw
= io_apic_read(apic
, 1);
1963 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
1964 nr_ioapic_registers
[apic
] = reg_01
.bits
.entries
+1;
1967 if (!legacy_pic
->nr_legacy_irqs
)
1970 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
1972 /* See if any of the pins is in ExtINT mode */
1973 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1974 struct IO_APIC_route_entry entry
;
1975 entry
= ioapic_read_entry(apic
, pin
);
1977 /* If the interrupt line is enabled and in ExtInt mode
1978 * I have found the pin where the i8259 is connected.
1980 if ((entry
.mask
== 0) && (entry
.delivery_mode
== dest_ExtINT
)) {
1981 ioapic_i8259
.apic
= apic
;
1982 ioapic_i8259
.pin
= pin
;
1988 /* Look to see what if the MP table has reported the ExtINT */
1989 /* If we could not find the appropriate pin by looking at the ioapic
1990 * the i8259 probably is not connected the ioapic but give the
1991 * mptable a chance anyway.
1993 i8259_pin
= find_isa_irq_pin(0, mp_ExtINT
);
1994 i8259_apic
= find_isa_irq_apic(0, mp_ExtINT
);
1995 /* Trust the MP table if nothing is setup in the hardware */
1996 if ((ioapic_i8259
.pin
== -1) && (i8259_pin
>= 0)) {
1997 printk(KERN_WARNING
"ExtINT not setup in hardware but reported by MP table\n");
1998 ioapic_i8259
.pin
= i8259_pin
;
1999 ioapic_i8259
.apic
= i8259_apic
;
2001 /* Complain if the MP table and the hardware disagree */
2002 if (((ioapic_i8259
.apic
!= i8259_apic
) || (ioapic_i8259
.pin
!= i8259_pin
)) &&
2003 (i8259_pin
>= 0) && (ioapic_i8259
.pin
>= 0))
2005 printk(KERN_WARNING
"ExtINT in hardware and MP table differ\n");
2009 * Do not trust the IO-APIC being empty at bootup
2015 * Not an __init, needed by the reboot code
2017 void disable_IO_APIC(void)
2020 * Clear the IO-APIC before rebooting:
2024 if (!legacy_pic
->nr_legacy_irqs
)
2028 * If the i8259 is routed through an IOAPIC
2029 * Put that IOAPIC in virtual wire mode
2030 * so legacy interrupts can be delivered.
2032 * With interrupt-remapping, for now we will use virtual wire A mode,
2033 * as virtual wire B is little complex (need to configure both
2034 * IOAPIC RTE aswell as interrupt-remapping table entry).
2035 * As this gets called during crash dump, keep this simple for now.
2037 if (ioapic_i8259
.pin
!= -1 && !intr_remapping_enabled
) {
2038 struct IO_APIC_route_entry entry
;
2040 memset(&entry
, 0, sizeof(entry
));
2041 entry
.mask
= 0; /* Enabled */
2042 entry
.trigger
= 0; /* Edge */
2044 entry
.polarity
= 0; /* High */
2045 entry
.delivery_status
= 0;
2046 entry
.dest_mode
= 0; /* Physical */
2047 entry
.delivery_mode
= dest_ExtINT
; /* ExtInt */
2049 entry
.dest
= read_apic_id();
2052 * Add it to the IO-APIC irq-routing table:
2054 ioapic_write_entry(ioapic_i8259
.apic
, ioapic_i8259
.pin
, entry
);
2058 * Use virtual wire A mode when interrupt remapping is enabled.
2060 if (cpu_has_apic
|| apic_from_smp_config())
2061 disconnect_bsp_APIC(!intr_remapping_enabled
&&
2062 ioapic_i8259
.pin
!= -1);
2065 #ifdef CONFIG_X86_32
2067 * function to set the IO-APIC physical IDs based on the
2068 * values stored in the MPC table.
2070 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
2073 void __init
setup_ioapic_ids_from_mpc(void)
2075 union IO_APIC_reg_00 reg_00
;
2076 physid_mask_t phys_id_present_map
;
2079 unsigned char old_id
;
2080 unsigned long flags
;
2085 * Don't check I/O APIC IDs for xAPIC systems. They have
2086 * no meaning without the serial APIC bus.
2088 if (!(boot_cpu_data
.x86_vendor
== X86_VENDOR_INTEL
)
2089 || APIC_XAPIC(apic_version
[boot_cpu_physical_apicid
]))
2092 * This is broken; anything with a real cpu count has to
2093 * circumvent this idiocy regardless.
2095 apic
->ioapic_phys_id_map(&phys_cpu_present_map
, &phys_id_present_map
);
2098 * Set the IOAPIC ID to the value stored in the MPC table.
2100 for (apic_id
= 0; apic_id
< nr_ioapics
; apic_id
++) {
2102 /* Read the register 0 value */
2103 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
2104 reg_00
.raw
= io_apic_read(apic_id
, 0);
2105 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
2107 old_id
= mp_ioapics
[apic_id
].apicid
;
2109 if (mp_ioapics
[apic_id
].apicid
>= get_physical_broadcast()) {
2110 printk(KERN_ERR
"BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
2111 apic_id
, mp_ioapics
[apic_id
].apicid
);
2112 printk(KERN_ERR
"... fixing up to %d. (tell your hw vendor)\n",
2114 mp_ioapics
[apic_id
].apicid
= reg_00
.bits
.ID
;
2118 * Sanity check, is the ID really free? Every APIC in a
2119 * system must have a unique ID or we get lots of nice
2120 * 'stuck on smp_invalidate_needed IPI wait' messages.
2122 if (apic
->check_apicid_used(&phys_id_present_map
,
2123 mp_ioapics
[apic_id
].apicid
)) {
2124 printk(KERN_ERR
"BIOS bug, IO-APIC#%d ID %d is already used!...\n",
2125 apic_id
, mp_ioapics
[apic_id
].apicid
);
2126 for (i
= 0; i
< get_physical_broadcast(); i
++)
2127 if (!physid_isset(i
, phys_id_present_map
))
2129 if (i
>= get_physical_broadcast())
2130 panic("Max APIC ID exceeded!\n");
2131 printk(KERN_ERR
"... fixing up to %d. (tell your hw vendor)\n",
2133 physid_set(i
, phys_id_present_map
);
2134 mp_ioapics
[apic_id
].apicid
= i
;
2137 apic
->apicid_to_cpu_present(mp_ioapics
[apic_id
].apicid
, &tmp
);
2138 apic_printk(APIC_VERBOSE
, "Setting %d in the "
2139 "phys_id_present_map\n",
2140 mp_ioapics
[apic_id
].apicid
);
2141 physids_or(phys_id_present_map
, phys_id_present_map
, tmp
);
2146 * We need to adjust the IRQ routing table
2147 * if the ID changed.
2149 if (old_id
!= mp_ioapics
[apic_id
].apicid
)
2150 for (i
= 0; i
< mp_irq_entries
; i
++)
2151 if (mp_irqs
[i
].dstapic
== old_id
)
2153 = mp_ioapics
[apic_id
].apicid
;
2156 * Read the right value from the MPC table and
2157 * write it into the ID register.
2159 apic_printk(APIC_VERBOSE
, KERN_INFO
2160 "...changing IO-APIC physical APIC ID to %d ...",
2161 mp_ioapics
[apic_id
].apicid
);
2163 reg_00
.bits
.ID
= mp_ioapics
[apic_id
].apicid
;
2164 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
2165 io_apic_write(apic_id
, 0, reg_00
.raw
);
2166 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
2171 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
2172 reg_00
.raw
= io_apic_read(apic_id
, 0);
2173 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
2174 if (reg_00
.bits
.ID
!= mp_ioapics
[apic_id
].apicid
)
2175 printk("could not set ID!\n");
2177 apic_printk(APIC_VERBOSE
, " ok.\n");
2182 int no_timer_check __initdata
;
2184 static int __init
notimercheck(char *s
)
2189 __setup("no_timer_check", notimercheck
);
2192 * There is a nasty bug in some older SMP boards, their mptable lies
2193 * about the timer IRQ. We do the following to work around the situation:
2195 * - timer IRQ defaults to IO-APIC IRQ
2196 * - if this function detects that timer IRQs are defunct, then we fall
2197 * back to ISA timer IRQs
2199 static int __init
timer_irq_works(void)
2201 unsigned long t1
= jiffies
;
2202 unsigned long flags
;
2207 local_save_flags(flags
);
2209 /* Let ten ticks pass... */
2210 mdelay((10 * 1000) / HZ
);
2211 local_irq_restore(flags
);
2214 * Expect a few ticks at least, to be sure some possible
2215 * glue logic does not lock up after one or two first
2216 * ticks in a non-ExtINT mode. Also the local APIC
2217 * might have cached one ExtINT interrupt. Finally, at
2218 * least one tick may be lost due to delays.
2222 if (time_after(jiffies
, t1
+ 4))
2228 * In the SMP+IOAPIC case it might happen that there are an unspecified
2229 * number of pending IRQ events unhandled. These cases are very rare,
2230 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
2231 * better to do it this way as thus we do not have to be aware of
2232 * 'pending' interrupts in the IRQ path, except at this point.
2235 * Edge triggered needs to resend any interrupt
2236 * that was delayed but this is now handled in the device
2241 * Starting up a edge-triggered IO-APIC interrupt is
2242 * nasty - we need to make sure that we get the edge.
2243 * If it is already asserted for some reason, we need
2244 * return 1 to indicate that is was pending.
2246 * This is not complete - we should be able to fake
2247 * an edge even if it isn't on the 8259A...
2250 static unsigned int startup_ioapic_irq(unsigned int irq
)
2252 int was_pending
= 0;
2253 unsigned long flags
;
2254 struct irq_cfg
*cfg
;
2256 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
2257 if (irq
< legacy_pic
->nr_legacy_irqs
) {
2258 legacy_pic
->chip
->mask(irq
);
2259 if (legacy_pic
->irq_pending(irq
))
2263 __unmask_IO_APIC_irq(cfg
);
2264 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
2269 static int ioapic_retrigger_irq(unsigned int irq
)
2272 struct irq_cfg
*cfg
= irq_cfg(irq
);
2273 unsigned long flags
;
2275 raw_spin_lock_irqsave(&vector_lock
, flags
);
2276 apic
->send_IPI_mask(cpumask_of(cpumask_first(cfg
->domain
)), cfg
->vector
);
2277 raw_spin_unlock_irqrestore(&vector_lock
, flags
);
2283 * Level and edge triggered IO-APIC interrupts need different handling,
2284 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
2285 * handled with the level-triggered descriptor, but that one has slightly
2286 * more overhead. Level-triggered interrupts cannot be handled with the
2287 * edge-triggered handler, without risking IRQ storms and other ugly
2292 void send_cleanup_vector(struct irq_cfg
*cfg
)
2294 cpumask_var_t cleanup_mask
;
2296 if (unlikely(!alloc_cpumask_var(&cleanup_mask
, GFP_ATOMIC
))) {
2298 for_each_cpu_and(i
, cfg
->old_domain
, cpu_online_mask
)
2299 apic
->send_IPI_mask(cpumask_of(i
), IRQ_MOVE_CLEANUP_VECTOR
);
2301 cpumask_and(cleanup_mask
, cfg
->old_domain
, cpu_online_mask
);
2302 apic
->send_IPI_mask(cleanup_mask
, IRQ_MOVE_CLEANUP_VECTOR
);
2303 free_cpumask_var(cleanup_mask
);
2305 cfg
->move_in_progress
= 0;
2308 static void __target_IO_APIC_irq(unsigned int irq
, unsigned int dest
, struct irq_cfg
*cfg
)
2311 struct irq_pin_list
*entry
;
2312 u8 vector
= cfg
->vector
;
2314 for_each_irq_pin(entry
, cfg
->irq_2_pin
) {
2320 * With interrupt-remapping, destination information comes
2321 * from interrupt-remapping table entry.
2323 if (!irq_remapped(irq
))
2324 io_apic_write(apic
, 0x11 + pin
*2, dest
);
2325 reg
= io_apic_read(apic
, 0x10 + pin
*2);
2326 reg
&= ~IO_APIC_REDIR_VECTOR_MASK
;
2328 io_apic_modify(apic
, 0x10 + pin
*2, reg
);
2333 * Either sets desc->affinity to a valid value, and returns
2334 * ->cpu_mask_to_apicid of that in dest_id, or returns -1 and
2335 * leaves desc->affinity untouched.
2338 set_desc_affinity(struct irq_desc
*desc
, const struct cpumask
*mask
,
2339 unsigned int *dest_id
)
2341 struct irq_cfg
*cfg
;
2344 if (!cpumask_intersects(mask
, cpu_online_mask
))
2348 cfg
= desc
->chip_data
;
2349 if (assign_irq_vector(irq
, cfg
, mask
))
2352 cpumask_copy(desc
->affinity
, mask
);
2354 *dest_id
= apic
->cpu_mask_to_apicid_and(desc
->affinity
, cfg
->domain
);
2359 set_ioapic_affinity_irq_desc(struct irq_desc
*desc
, const struct cpumask
*mask
)
2361 struct irq_cfg
*cfg
;
2362 unsigned long flags
;
2368 cfg
= desc
->chip_data
;
2370 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
2371 ret
= set_desc_affinity(desc
, mask
, &dest
);
2373 /* Only the high 8 bits are valid. */
2374 dest
= SET_APIC_LOGICAL_ID(dest
);
2375 __target_IO_APIC_irq(irq
, dest
, cfg
);
2377 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
2383 set_ioapic_affinity_irq(unsigned int irq
, const struct cpumask
*mask
)
2385 struct irq_desc
*desc
;
2387 desc
= irq_to_desc(irq
);
2389 return set_ioapic_affinity_irq_desc(desc
, mask
);
2392 #ifdef CONFIG_INTR_REMAP
2395 * Migrate the IO-APIC irq in the presence of intr-remapping.
2397 * For both level and edge triggered, irq migration is a simple atomic
2398 * update(of vector and cpu destination) of IRTE and flush the hardware cache.
2400 * For level triggered, we eliminate the io-apic RTE modification (with the
2401 * updated vector information), by using a virtual vector (io-apic pin number).
2402 * Real vector that is used for interrupting cpu will be coming from
2403 * the interrupt-remapping table entry.
2406 migrate_ioapic_irq_desc(struct irq_desc
*desc
, const struct cpumask
*mask
)
2408 struct irq_cfg
*cfg
;
2414 if (!cpumask_intersects(mask
, cpu_online_mask
))
2418 if (get_irte(irq
, &irte
))
2421 cfg
= desc
->chip_data
;
2422 if (assign_irq_vector(irq
, cfg
, mask
))
2425 dest
= apic
->cpu_mask_to_apicid_and(cfg
->domain
, mask
);
2427 irte
.vector
= cfg
->vector
;
2428 irte
.dest_id
= IRTE_DEST(dest
);
2431 * Modified the IRTE and flushes the Interrupt entry cache.
2433 modify_irte(irq
, &irte
);
2435 if (cfg
->move_in_progress
)
2436 send_cleanup_vector(cfg
);
2438 cpumask_copy(desc
->affinity
, mask
);
2444 * Migrates the IRQ destination in the process context.
2446 static int set_ir_ioapic_affinity_irq_desc(struct irq_desc
*desc
,
2447 const struct cpumask
*mask
)
2449 return migrate_ioapic_irq_desc(desc
, mask
);
2451 static int set_ir_ioapic_affinity_irq(unsigned int irq
,
2452 const struct cpumask
*mask
)
2454 struct irq_desc
*desc
= irq_to_desc(irq
);
2456 return set_ir_ioapic_affinity_irq_desc(desc
, mask
);
2459 static inline int set_ir_ioapic_affinity_irq_desc(struct irq_desc
*desc
,
2460 const struct cpumask
*mask
)
2466 asmlinkage
void smp_irq_move_cleanup_interrupt(void)
2468 unsigned vector
, me
;
2474 me
= smp_processor_id();
2475 for (vector
= FIRST_EXTERNAL_VECTOR
; vector
< NR_VECTORS
; vector
++) {
2478 struct irq_desc
*desc
;
2479 struct irq_cfg
*cfg
;
2480 irq
= __get_cpu_var(vector_irq
)[vector
];
2485 desc
= irq_to_desc(irq
);
2490 raw_spin_lock(&desc
->lock
);
2493 * Check if the irq migration is in progress. If so, we
2494 * haven't received the cleanup request yet for this irq.
2496 if (cfg
->move_in_progress
)
2499 if (vector
== cfg
->vector
&& cpumask_test_cpu(me
, cfg
->domain
))
2502 irr
= apic_read(APIC_IRR
+ (vector
/ 32 * 0x10));
2504 * Check if the vector that needs to be cleanedup is
2505 * registered at the cpu's IRR. If so, then this is not
2506 * the best time to clean it up. Lets clean it up in the
2507 * next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR
2510 if (irr
& (1 << (vector
% 32))) {
2511 apic
->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR
);
2514 __get_cpu_var(vector_irq
)[vector
] = -1;
2516 raw_spin_unlock(&desc
->lock
);
2522 static void __irq_complete_move(struct irq_desc
**descp
, unsigned vector
)
2524 struct irq_desc
*desc
= *descp
;
2525 struct irq_cfg
*cfg
= desc
->chip_data
;
2528 if (likely(!cfg
->move_in_progress
))
2531 me
= smp_processor_id();
2533 if (vector
== cfg
->vector
&& cpumask_test_cpu(me
, cfg
->domain
))
2534 send_cleanup_vector(cfg
);
2537 static void irq_complete_move(struct irq_desc
**descp
)
2539 __irq_complete_move(descp
, ~get_irq_regs()->orig_ax
);
2542 void irq_force_complete_move(int irq
)
2544 struct irq_desc
*desc
= irq_to_desc(irq
);
2545 struct irq_cfg
*cfg
= desc
->chip_data
;
2547 __irq_complete_move(&desc
, cfg
->vector
);
2550 static inline void irq_complete_move(struct irq_desc
**descp
) {}
2553 static void ack_apic_edge(unsigned int irq
)
2555 struct irq_desc
*desc
= irq_to_desc(irq
);
2557 irq_complete_move(&desc
);
2558 move_native_irq(irq
);
2562 atomic_t irq_mis_count
;
2565 * IO-APIC versions below 0x20 don't support EOI register.
2566 * For the record, here is the information about various versions:
2568 * 1Xh I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
2569 * 2Xh I/O(x)APIC which is PCI 2.2 Compliant
2572 * Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
2573 * version as 0x2. This is an error with documentation and these ICH chips
2574 * use io-apic's of version 0x20.
2576 * For IO-APIC's with EOI register, we use that to do an explicit EOI.
2577 * Otherwise, we simulate the EOI message manually by changing the trigger
2578 * mode to edge and then back to level, with RTE being masked during this.
2580 static void __eoi_ioapic_irq(unsigned int irq
, struct irq_cfg
*cfg
)
2582 struct irq_pin_list
*entry
;
2584 for_each_irq_pin(entry
, cfg
->irq_2_pin
) {
2585 if (mp_ioapics
[entry
->apic
].apicver
>= 0x20) {
2587 * Intr-remapping uses pin number as the virtual vector
2588 * in the RTE. Actual vector is programmed in
2589 * intr-remapping table entry. Hence for the io-apic
2590 * EOI we use the pin number.
2592 if (irq_remapped(irq
))
2593 io_apic_eoi(entry
->apic
, entry
->pin
);
2595 io_apic_eoi(entry
->apic
, cfg
->vector
);
2597 __mask_and_edge_IO_APIC_irq(entry
);
2598 __unmask_and_level_IO_APIC_irq(entry
);
2603 static void eoi_ioapic_irq(struct irq_desc
*desc
)
2605 struct irq_cfg
*cfg
;
2606 unsigned long flags
;
2610 cfg
= desc
->chip_data
;
2612 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
2613 __eoi_ioapic_irq(irq
, cfg
);
2614 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
2617 static void ack_apic_level(unsigned int irq
)
2619 struct irq_desc
*desc
= irq_to_desc(irq
);
2622 struct irq_cfg
*cfg
;
2623 int do_unmask_irq
= 0;
2625 irq_complete_move(&desc
);
2626 #ifdef CONFIG_GENERIC_PENDING_IRQ
2627 /* If we are moving the irq we need to mask it */
2628 if (unlikely(desc
->status
& IRQ_MOVE_PENDING
)) {
2630 mask_IO_APIC_irq_desc(desc
);
2635 * It appears there is an erratum which affects at least version 0x11
2636 * of I/O APIC (that's the 82093AA and cores integrated into various
2637 * chipsets). Under certain conditions a level-triggered interrupt is
2638 * erroneously delivered as edge-triggered one but the respective IRR
2639 * bit gets set nevertheless. As a result the I/O unit expects an EOI
2640 * message but it will never arrive and further interrupts are blocked
2641 * from the source. The exact reason is so far unknown, but the
2642 * phenomenon was observed when two consecutive interrupt requests
2643 * from a given source get delivered to the same CPU and the source is
2644 * temporarily disabled in between.
2646 * A workaround is to simulate an EOI message manually. We achieve it
2647 * by setting the trigger mode to edge and then to level when the edge
2648 * trigger mode gets detected in the TMR of a local APIC for a
2649 * level-triggered interrupt. We mask the source for the time of the
2650 * operation to prevent an edge-triggered interrupt escaping meanwhile.
2651 * The idea is from Manfred Spraul. --macro
2653 * Also in the case when cpu goes offline, fixup_irqs() will forward
2654 * any unhandled interrupt on the offlined cpu to the new cpu
2655 * destination that is handling the corresponding interrupt. This
2656 * interrupt forwarding is done via IPI's. Hence, in this case also
2657 * level-triggered io-apic interrupt will be seen as an edge
2658 * interrupt in the IRR. And we can't rely on the cpu's EOI
2659 * to be broadcasted to the IO-APIC's which will clear the remoteIRR
2660 * corresponding to the level-triggered interrupt. Hence on IO-APIC's
2661 * supporting EOI register, we do an explicit EOI to clear the
2662 * remote IRR and on IO-APIC's which don't have an EOI register,
2663 * we use the above logic (mask+edge followed by unmask+level) from
2664 * Manfred Spraul to clear the remote IRR.
2666 cfg
= desc
->chip_data
;
2668 v
= apic_read(APIC_TMR
+ ((i
& ~0x1f) >> 1));
2671 * We must acknowledge the irq before we move it or the acknowledge will
2672 * not propagate properly.
2677 * Tail end of clearing remote IRR bit (either by delivering the EOI
2678 * message via io-apic EOI register write or simulating it using
2679 * mask+edge followed by unnask+level logic) manually when the
2680 * level triggered interrupt is seen as the edge triggered interrupt
2683 if (!(v
& (1 << (i
& 0x1f)))) {
2684 atomic_inc(&irq_mis_count
);
2686 eoi_ioapic_irq(desc
);
2689 /* Now we can move and renable the irq */
2690 if (unlikely(do_unmask_irq
)) {
2691 /* Only migrate the irq if the ack has been received.
2693 * On rare occasions the broadcast level triggered ack gets
2694 * delayed going to ioapics, and if we reprogram the
2695 * vector while Remote IRR is still set the irq will never
2698 * To prevent this scenario we read the Remote IRR bit
2699 * of the ioapic. This has two effects.
2700 * - On any sane system the read of the ioapic will
2701 * flush writes (and acks) going to the ioapic from
2703 * - We get to see if the ACK has actually been delivered.
2705 * Based on failed experiments of reprogramming the
2706 * ioapic entry from outside of irq context starting
2707 * with masking the ioapic entry and then polling until
2708 * Remote IRR was clear before reprogramming the
2709 * ioapic I don't trust the Remote IRR bit to be
2710 * completey accurate.
2712 * However there appears to be no other way to plug
2713 * this race, so if the Remote IRR bit is not
2714 * accurate and is causing problems then it is a hardware bug
2715 * and you can go talk to the chipset vendor about it.
2717 cfg
= desc
->chip_data
;
2718 if (!io_apic_level_ack_pending(cfg
))
2719 move_masked_irq(irq
);
2720 unmask_IO_APIC_irq_desc(desc
);
2724 #ifdef CONFIG_INTR_REMAP
2725 static void ir_ack_apic_edge(unsigned int irq
)
2730 static void ir_ack_apic_level(unsigned int irq
)
2732 struct irq_desc
*desc
= irq_to_desc(irq
);
2735 eoi_ioapic_irq(desc
);
2737 #endif /* CONFIG_INTR_REMAP */
2739 static struct irq_chip ioapic_chip __read_mostly
= {
2741 .startup
= startup_ioapic_irq
,
2742 .mask
= mask_IO_APIC_irq
,
2743 .unmask
= unmask_IO_APIC_irq
,
2744 .ack
= ack_apic_edge
,
2745 .eoi
= ack_apic_level
,
2747 .set_affinity
= set_ioapic_affinity_irq
,
2749 .retrigger
= ioapic_retrigger_irq
,
2752 static struct irq_chip ir_ioapic_chip __read_mostly
= {
2753 .name
= "IR-IO-APIC",
2754 .startup
= startup_ioapic_irq
,
2755 .mask
= mask_IO_APIC_irq
,
2756 .unmask
= unmask_IO_APIC_irq
,
2757 #ifdef CONFIG_INTR_REMAP
2758 .ack
= ir_ack_apic_edge
,
2759 .eoi
= ir_ack_apic_level
,
2761 .set_affinity
= set_ir_ioapic_affinity_irq
,
2764 .retrigger
= ioapic_retrigger_irq
,
2767 static inline void init_IO_APIC_traps(void)
2770 struct irq_desc
*desc
;
2771 struct irq_cfg
*cfg
;
2774 * NOTE! The local APIC isn't very good at handling
2775 * multiple interrupts at the same interrupt level.
2776 * As the interrupt level is determined by taking the
2777 * vector number and shifting that right by 4, we
2778 * want to spread these out a bit so that they don't
2779 * all fall in the same interrupt level.
2781 * Also, we've got to be careful not to trash gate
2782 * 0x80, because int 0x80 is hm, kind of importantish. ;)
2784 for_each_irq_desc(irq
, desc
) {
2785 cfg
= desc
->chip_data
;
2786 if (IO_APIC_IRQ(irq
) && cfg
&& !cfg
->vector
) {
2788 * Hmm.. We don't have an entry for this,
2789 * so default to an old-fashioned 8259
2790 * interrupt if we can..
2792 if (irq
< legacy_pic
->nr_legacy_irqs
)
2793 legacy_pic
->make_irq(irq
);
2795 /* Strange. Oh, well.. */
2796 desc
->chip
= &no_irq_chip
;
2802 * The local APIC irq-chip implementation:
2805 static void mask_lapic_irq(unsigned int irq
)
2809 v
= apic_read(APIC_LVT0
);
2810 apic_write(APIC_LVT0
, v
| APIC_LVT_MASKED
);
2813 static void unmask_lapic_irq(unsigned int irq
)
2817 v
= apic_read(APIC_LVT0
);
2818 apic_write(APIC_LVT0
, v
& ~APIC_LVT_MASKED
);
2821 static void ack_lapic_irq(unsigned int irq
)
2826 static struct irq_chip lapic_chip __read_mostly
= {
2827 .name
= "local-APIC",
2828 .mask
= mask_lapic_irq
,
2829 .unmask
= unmask_lapic_irq
,
2830 .ack
= ack_lapic_irq
,
2833 static void lapic_register_intr(int irq
, struct irq_desc
*desc
)
2835 desc
->status
&= ~IRQ_LEVEL
;
2836 set_irq_chip_and_handler_name(irq
, &lapic_chip
, handle_edge_irq
,
2840 static void __init
setup_nmi(void)
2843 * Dirty trick to enable the NMI watchdog ...
2844 * We put the 8259A master into AEOI mode and
2845 * unmask on all local APICs LVT0 as NMI.
2847 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2848 * is from Maciej W. Rozycki - so we do not have to EOI from
2849 * the NMI handler or the timer interrupt.
2851 apic_printk(APIC_VERBOSE
, KERN_INFO
"activating NMI Watchdog ...");
2853 enable_NMI_through_LVT0();
2855 apic_printk(APIC_VERBOSE
, " done.\n");
2859 * This looks a bit hackish but it's about the only one way of sending
2860 * a few INTA cycles to 8259As and any associated glue logic. ICR does
2861 * not support the ExtINT mode, unfortunately. We need to send these
2862 * cycles as some i82489DX-based boards have glue logic that keeps the
2863 * 8259A interrupt line asserted until INTA. --macro
2865 static inline void __init
unlock_ExtINT_logic(void)
2868 struct IO_APIC_route_entry entry0
, entry1
;
2869 unsigned char save_control
, save_freq_select
;
2871 pin
= find_isa_irq_pin(8, mp_INT
);
2876 apic
= find_isa_irq_apic(8, mp_INT
);
2882 entry0
= ioapic_read_entry(apic
, pin
);
2883 clear_IO_APIC_pin(apic
, pin
);
2885 memset(&entry1
, 0, sizeof(entry1
));
2887 entry1
.dest_mode
= 0; /* physical delivery */
2888 entry1
.mask
= 0; /* unmask IRQ now */
2889 entry1
.dest
= hard_smp_processor_id();
2890 entry1
.delivery_mode
= dest_ExtINT
;
2891 entry1
.polarity
= entry0
.polarity
;
2895 ioapic_write_entry(apic
, pin
, entry1
);
2897 save_control
= CMOS_READ(RTC_CONTROL
);
2898 save_freq_select
= CMOS_READ(RTC_FREQ_SELECT
);
2899 CMOS_WRITE((save_freq_select
& ~RTC_RATE_SELECT
) | 0x6,
2901 CMOS_WRITE(save_control
| RTC_PIE
, RTC_CONTROL
);
2906 if ((CMOS_READ(RTC_INTR_FLAGS
) & RTC_PF
) == RTC_PF
)
2910 CMOS_WRITE(save_control
, RTC_CONTROL
);
2911 CMOS_WRITE(save_freq_select
, RTC_FREQ_SELECT
);
2912 clear_IO_APIC_pin(apic
, pin
);
2914 ioapic_write_entry(apic
, pin
, entry0
);
2917 static int disable_timer_pin_1 __initdata
;
2918 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2919 static int __init
disable_timer_pin_setup(char *arg
)
2921 disable_timer_pin_1
= 1;
2924 early_param("disable_timer_pin_1", disable_timer_pin_setup
);
2926 int timer_through_8259 __initdata
;
2929 * This code may look a bit paranoid, but it's supposed to cooperate with
2930 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2931 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2932 * fanatically on his truly buggy board.
2934 * FIXME: really need to revamp this for all platforms.
2936 static inline void __init
check_timer(void)
2938 struct irq_desc
*desc
= irq_to_desc(0);
2939 struct irq_cfg
*cfg
= desc
->chip_data
;
2940 int node
= cpu_to_node(boot_cpu_id
);
2941 int apic1
, pin1
, apic2
, pin2
;
2942 unsigned long flags
;
2945 local_irq_save(flags
);
2948 * get/set the timer IRQ vector:
2950 legacy_pic
->chip
->mask(0);
2951 assign_irq_vector(0, cfg
, apic
->target_cpus());
2954 * As IRQ0 is to be enabled in the 8259A, the virtual
2955 * wire has to be disabled in the local APIC. Also
2956 * timer interrupts need to be acknowledged manually in
2957 * the 8259A for the i82489DX when using the NMI
2958 * watchdog as that APIC treats NMIs as level-triggered.
2959 * The AEOI mode will finish them in the 8259A
2962 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_EXTINT
);
2963 legacy_pic
->init(1);
2964 #ifdef CONFIG_X86_32
2968 ver
= apic_read(APIC_LVR
);
2969 ver
= GET_APIC_VERSION(ver
);
2970 timer_ack
= (nmi_watchdog
== NMI_IO_APIC
&& !APIC_INTEGRATED(ver
));
2974 pin1
= find_isa_irq_pin(0, mp_INT
);
2975 apic1
= find_isa_irq_apic(0, mp_INT
);
2976 pin2
= ioapic_i8259
.pin
;
2977 apic2
= ioapic_i8259
.apic
;
2979 apic_printk(APIC_QUIET
, KERN_INFO
"..TIMER: vector=0x%02X "
2980 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2981 cfg
->vector
, apic1
, pin1
, apic2
, pin2
);
2984 * Some BIOS writers are clueless and report the ExtINTA
2985 * I/O APIC input from the cascaded 8259A as the timer
2986 * interrupt input. So just in case, if only one pin
2987 * was found above, try it both directly and through the
2991 if (intr_remapping_enabled
)
2992 panic("BIOS bug: timer not connected to IO-APIC");
2996 } else if (pin2
== -1) {
3003 * Ok, does IRQ0 through the IOAPIC work?
3006 add_pin_to_irq_node(cfg
, node
, apic1
, pin1
);
3007 setup_timer_IRQ0_pin(apic1
, pin1
, cfg
->vector
);
3009 /* for edge trigger, setup_IO_APIC_irq already
3010 * leave it unmasked.
3011 * so only need to unmask if it is level-trigger
3012 * do we really have level trigger timer?
3015 idx
= find_irq_entry(apic1
, pin1
, mp_INT
);
3016 if (idx
!= -1 && irq_trigger(idx
))
3017 unmask_IO_APIC_irq_desc(desc
);
3019 if (timer_irq_works()) {
3020 if (nmi_watchdog
== NMI_IO_APIC
) {
3022 legacy_pic
->chip
->unmask(0);
3024 if (disable_timer_pin_1
> 0)
3025 clear_IO_APIC_pin(0, pin1
);
3028 if (intr_remapping_enabled
)
3029 panic("timer doesn't work through Interrupt-remapped IO-APIC");
3030 local_irq_disable();
3031 clear_IO_APIC_pin(apic1
, pin1
);
3033 apic_printk(APIC_QUIET
, KERN_ERR
"..MP-BIOS bug: "
3034 "8254 timer not connected to IO-APIC\n");
3036 apic_printk(APIC_QUIET
, KERN_INFO
"...trying to set up timer "
3037 "(IRQ0) through the 8259A ...\n");
3038 apic_printk(APIC_QUIET
, KERN_INFO
3039 "..... (found apic %d pin %d) ...\n", apic2
, pin2
);
3041 * legacy devices should be connected to IO APIC #0
3043 replace_pin_at_irq_node(cfg
, node
, apic1
, pin1
, apic2
, pin2
);
3044 setup_timer_IRQ0_pin(apic2
, pin2
, cfg
->vector
);
3045 legacy_pic
->chip
->unmask(0);
3046 if (timer_irq_works()) {
3047 apic_printk(APIC_QUIET
, KERN_INFO
"....... works.\n");
3048 timer_through_8259
= 1;
3049 if (nmi_watchdog
== NMI_IO_APIC
) {
3050 legacy_pic
->chip
->mask(0);
3052 legacy_pic
->chip
->unmask(0);
3057 * Cleanup, just in case ...
3059 local_irq_disable();
3060 legacy_pic
->chip
->mask(0);
3061 clear_IO_APIC_pin(apic2
, pin2
);
3062 apic_printk(APIC_QUIET
, KERN_INFO
"....... failed.\n");
3065 if (nmi_watchdog
== NMI_IO_APIC
) {
3066 apic_printk(APIC_QUIET
, KERN_WARNING
"timer doesn't work "
3067 "through the IO-APIC - disabling NMI Watchdog!\n");
3068 nmi_watchdog
= NMI_NONE
;
3070 #ifdef CONFIG_X86_32
3074 apic_printk(APIC_QUIET
, KERN_INFO
3075 "...trying to set up timer as Virtual Wire IRQ...\n");
3077 lapic_register_intr(0, desc
);
3078 apic_write(APIC_LVT0
, APIC_DM_FIXED
| cfg
->vector
); /* Fixed mode */
3079 legacy_pic
->chip
->unmask(0);
3081 if (timer_irq_works()) {
3082 apic_printk(APIC_QUIET
, KERN_INFO
"..... works.\n");
3085 local_irq_disable();
3086 legacy_pic
->chip
->mask(0);
3087 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_FIXED
| cfg
->vector
);
3088 apic_printk(APIC_QUIET
, KERN_INFO
"..... failed.\n");
3090 apic_printk(APIC_QUIET
, KERN_INFO
3091 "...trying to set up timer as ExtINT IRQ...\n");
3093 legacy_pic
->init(0);
3094 legacy_pic
->make_irq(0);
3095 apic_write(APIC_LVT0
, APIC_DM_EXTINT
);
3097 unlock_ExtINT_logic();
3099 if (timer_irq_works()) {
3100 apic_printk(APIC_QUIET
, KERN_INFO
"..... works.\n");
3103 local_irq_disable();
3104 apic_printk(APIC_QUIET
, KERN_INFO
"..... failed :(.\n");
3105 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
3106 "report. Then try booting with the 'noapic' option.\n");
3108 local_irq_restore(flags
);
3112 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
3113 * to devices. However there may be an I/O APIC pin available for
3114 * this interrupt regardless. The pin may be left unconnected, but
3115 * typically it will be reused as an ExtINT cascade interrupt for
3116 * the master 8259A. In the MPS case such a pin will normally be
3117 * reported as an ExtINT interrupt in the MP table. With ACPI
3118 * there is no provision for ExtINT interrupts, and in the absence
3119 * of an override it would be treated as an ordinary ISA I/O APIC
3120 * interrupt, that is edge-triggered and unmasked by default. We
3121 * used to do this, but it caused problems on some systems because
3122 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
3123 * the same ExtINT cascade interrupt to drive the local APIC of the
3124 * bootstrap processor. Therefore we refrain from routing IRQ2 to
3125 * the I/O APIC in all cases now. No actual device should request
3126 * it anyway. --macro
3128 #define PIC_IRQS (1UL << PIC_CASCADE_IR)
3130 void __init
setup_IO_APIC(void)
3134 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
3136 io_apic_irqs
= legacy_pic
->nr_legacy_irqs
? ~PIC_IRQS
: ~0UL;
3138 apic_printk(APIC_VERBOSE
, "ENABLING IO-APIC IRQs\n");
3140 * Set up IO-APIC IRQ routing.
3142 x86_init
.mpparse
.setup_ioapic_ids();
3145 setup_IO_APIC_irqs();
3146 init_IO_APIC_traps();
3147 if (legacy_pic
->nr_legacy_irqs
)
3152 * Called after all the initialization is done. If we didnt find any
3153 * APIC bugs then we can allow the modify fast path
3156 static int __init
io_apic_bug_finalize(void)
3158 if (sis_apic_bug
== -1)
3163 late_initcall(io_apic_bug_finalize
);
3165 struct sysfs_ioapic_data
{
3166 struct sys_device dev
;
3167 struct IO_APIC_route_entry entry
[0];
3169 static struct sysfs_ioapic_data
* mp_ioapic_data
[MAX_IO_APICS
];
3171 static int ioapic_suspend(struct sys_device
*dev
, pm_message_t state
)
3173 struct IO_APIC_route_entry
*entry
;
3174 struct sysfs_ioapic_data
*data
;
3177 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
3178 entry
= data
->entry
;
3179 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++, entry
++ )
3180 *entry
= ioapic_read_entry(dev
->id
, i
);
3185 static int ioapic_resume(struct sys_device
*dev
)
3187 struct IO_APIC_route_entry
*entry
;
3188 struct sysfs_ioapic_data
*data
;
3189 unsigned long flags
;
3190 union IO_APIC_reg_00 reg_00
;
3193 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
3194 entry
= data
->entry
;
3196 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
3197 reg_00
.raw
= io_apic_read(dev
->id
, 0);
3198 if (reg_00
.bits
.ID
!= mp_ioapics
[dev
->id
].apicid
) {
3199 reg_00
.bits
.ID
= mp_ioapics
[dev
->id
].apicid
;
3200 io_apic_write(dev
->id
, 0, reg_00
.raw
);
3202 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
3203 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++)
3204 ioapic_write_entry(dev
->id
, i
, entry
[i
]);
3209 static struct sysdev_class ioapic_sysdev_class
= {
3211 .suspend
= ioapic_suspend
,
3212 .resume
= ioapic_resume
,
3215 static int __init
ioapic_init_sysfs(void)
3217 struct sys_device
* dev
;
3220 error
= sysdev_class_register(&ioapic_sysdev_class
);
3224 for (i
= 0; i
< nr_ioapics
; i
++ ) {
3225 size
= sizeof(struct sys_device
) + nr_ioapic_registers
[i
]
3226 * sizeof(struct IO_APIC_route_entry
);
3227 mp_ioapic_data
[i
] = kzalloc(size
, GFP_KERNEL
);
3228 if (!mp_ioapic_data
[i
]) {
3229 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
3232 dev
= &mp_ioapic_data
[i
]->dev
;
3234 dev
->cls
= &ioapic_sysdev_class
;
3235 error
= sysdev_register(dev
);
3237 kfree(mp_ioapic_data
[i
]);
3238 mp_ioapic_data
[i
] = NULL
;
3239 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
3247 device_initcall(ioapic_init_sysfs
);
3250 * Dynamic irq allocate and deallocation
3252 unsigned int create_irq_nr(unsigned int irq_want
, int node
)
3254 /* Allocate an unused irq */
3257 unsigned long flags
;
3258 struct irq_cfg
*cfg_new
= NULL
;
3259 struct irq_desc
*desc_new
= NULL
;
3262 if (irq_want
< nr_irqs_gsi
)
3263 irq_want
= nr_irqs_gsi
;
3265 raw_spin_lock_irqsave(&vector_lock
, flags
);
3266 for (new = irq_want
; new < nr_irqs
; new++) {
3267 desc_new
= irq_to_desc_alloc_node(new, node
);
3269 printk(KERN_INFO
"can not get irq_desc for %d\n", new);
3272 cfg_new
= desc_new
->chip_data
;
3274 if (cfg_new
->vector
!= 0)
3277 desc_new
= move_irq_desc(desc_new
, node
);
3278 cfg_new
= desc_new
->chip_data
;
3280 if (__assign_irq_vector(new, cfg_new
, apic
->target_cpus()) == 0)
3284 raw_spin_unlock_irqrestore(&vector_lock
, flags
);
3287 dynamic_irq_init_keep_chip_data(irq
);
3292 int create_irq(void)
3294 int node
= cpu_to_node(boot_cpu_id
);
3295 unsigned int irq_want
;
3298 irq_want
= nr_irqs_gsi
;
3299 irq
= create_irq_nr(irq_want
, node
);
3307 void destroy_irq(unsigned int irq
)
3309 unsigned long flags
;
3311 dynamic_irq_cleanup_keep_chip_data(irq
);
3314 raw_spin_lock_irqsave(&vector_lock
, flags
);
3315 __clear_irq_vector(irq
, get_irq_chip_data(irq
));
3316 raw_spin_unlock_irqrestore(&vector_lock
, flags
);
3320 * MSI message composition
3322 #ifdef CONFIG_PCI_MSI
3323 static int msi_compose_msg(struct pci_dev
*pdev
, unsigned int irq
,
3324 struct msi_msg
*msg
, u8 hpet_id
)
3326 struct irq_cfg
*cfg
;
3334 err
= assign_irq_vector(irq
, cfg
, apic
->target_cpus());
3338 dest
= apic
->cpu_mask_to_apicid_and(cfg
->domain
, apic
->target_cpus());
3340 if (irq_remapped(irq
)) {
3345 ir_index
= map_irq_to_irte_handle(irq
, &sub_handle
);
3346 BUG_ON(ir_index
== -1);
3348 memset (&irte
, 0, sizeof(irte
));
3351 irte
.dst_mode
= apic
->irq_dest_mode
;
3352 irte
.trigger_mode
= 0; /* edge */
3353 irte
.dlvry_mode
= apic
->irq_delivery_mode
;
3354 irte
.vector
= cfg
->vector
;
3355 irte
.dest_id
= IRTE_DEST(dest
);
3357 /* Set source-id of interrupt request */
3359 set_msi_sid(&irte
, pdev
);
3361 set_hpet_sid(&irte
, hpet_id
);
3363 modify_irte(irq
, &irte
);
3365 msg
->address_hi
= MSI_ADDR_BASE_HI
;
3366 msg
->data
= sub_handle
;
3367 msg
->address_lo
= MSI_ADDR_BASE_LO
| MSI_ADDR_IR_EXT_INT
|
3369 MSI_ADDR_IR_INDEX1(ir_index
) |
3370 MSI_ADDR_IR_INDEX2(ir_index
);
3372 if (x2apic_enabled())
3373 msg
->address_hi
= MSI_ADDR_BASE_HI
|
3374 MSI_ADDR_EXT_DEST_ID(dest
);
3376 msg
->address_hi
= MSI_ADDR_BASE_HI
;
3380 ((apic
->irq_dest_mode
== 0) ?
3381 MSI_ADDR_DEST_MODE_PHYSICAL
:
3382 MSI_ADDR_DEST_MODE_LOGICAL
) |
3383 ((apic
->irq_delivery_mode
!= dest_LowestPrio
) ?
3384 MSI_ADDR_REDIRECTION_CPU
:
3385 MSI_ADDR_REDIRECTION_LOWPRI
) |
3386 MSI_ADDR_DEST_ID(dest
);
3389 MSI_DATA_TRIGGER_EDGE
|
3390 MSI_DATA_LEVEL_ASSERT
|
3391 ((apic
->irq_delivery_mode
!= dest_LowestPrio
) ?
3392 MSI_DATA_DELIVERY_FIXED
:
3393 MSI_DATA_DELIVERY_LOWPRI
) |
3394 MSI_DATA_VECTOR(cfg
->vector
);
3400 static int set_msi_irq_affinity(unsigned int irq
, const struct cpumask
*mask
)
3402 struct irq_desc
*desc
= irq_to_desc(irq
);
3403 struct irq_cfg
*cfg
;
3407 if (set_desc_affinity(desc
, mask
, &dest
))
3410 cfg
= desc
->chip_data
;
3412 read_msi_msg_desc(desc
, &msg
);
3414 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
3415 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
3416 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
3417 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
3419 write_msi_msg_desc(desc
, &msg
);
3423 #ifdef CONFIG_INTR_REMAP
3425 * Migrate the MSI irq to another cpumask. This migration is
3426 * done in the process context using interrupt-remapping hardware.
3429 ir_set_msi_irq_affinity(unsigned int irq
, const struct cpumask
*mask
)
3431 struct irq_desc
*desc
= irq_to_desc(irq
);
3432 struct irq_cfg
*cfg
= desc
->chip_data
;
3436 if (get_irte(irq
, &irte
))
3439 if (set_desc_affinity(desc
, mask
, &dest
))
3442 irte
.vector
= cfg
->vector
;
3443 irte
.dest_id
= IRTE_DEST(dest
);
3446 * atomically update the IRTE with the new destination and vector.
3448 modify_irte(irq
, &irte
);
3451 * After this point, all the interrupts will start arriving
3452 * at the new destination. So, time to cleanup the previous
3453 * vector allocation.
3455 if (cfg
->move_in_progress
)
3456 send_cleanup_vector(cfg
);
3462 #endif /* CONFIG_SMP */
3465 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
3466 * which implement the MSI or MSI-X Capability Structure.
3468 static struct irq_chip msi_chip
= {
3470 .unmask
= unmask_msi_irq
,
3471 .mask
= mask_msi_irq
,
3472 .ack
= ack_apic_edge
,
3474 .set_affinity
= set_msi_irq_affinity
,
3476 .retrigger
= ioapic_retrigger_irq
,
3479 static struct irq_chip msi_ir_chip
= {
3480 .name
= "IR-PCI-MSI",
3481 .unmask
= unmask_msi_irq
,
3482 .mask
= mask_msi_irq
,
3483 #ifdef CONFIG_INTR_REMAP
3484 .ack
= ir_ack_apic_edge
,
3486 .set_affinity
= ir_set_msi_irq_affinity
,
3489 .retrigger
= ioapic_retrigger_irq
,
3493 * Map the PCI dev to the corresponding remapping hardware unit
3494 * and allocate 'nvec' consecutive interrupt-remapping table entries
3497 static int msi_alloc_irte(struct pci_dev
*dev
, int irq
, int nvec
)
3499 struct intel_iommu
*iommu
;
3502 iommu
= map_dev_to_ir(dev
);
3505 "Unable to map PCI %s to iommu\n", pci_name(dev
));
3509 index
= alloc_irte(iommu
, irq
, nvec
);
3512 "Unable to allocate %d IRTE for PCI %s\n", nvec
,
3519 static int setup_msi_irq(struct pci_dev
*dev
, struct msi_desc
*msidesc
, int irq
)
3524 ret
= msi_compose_msg(dev
, irq
, &msg
, -1);
3528 set_irq_msi(irq
, msidesc
);
3529 write_msi_msg(irq
, &msg
);
3531 if (irq_remapped(irq
)) {
3532 struct irq_desc
*desc
= irq_to_desc(irq
);
3534 * irq migration in process context
3536 desc
->status
|= IRQ_MOVE_PCNTXT
;
3537 set_irq_chip_and_handler_name(irq
, &msi_ir_chip
, handle_edge_irq
, "edge");
3539 set_irq_chip_and_handler_name(irq
, &msi_chip
, handle_edge_irq
, "edge");
3541 dev_printk(KERN_DEBUG
, &dev
->dev
, "irq %d for MSI/MSI-X\n", irq
);
3546 int arch_setup_msi_irqs(struct pci_dev
*dev
, int nvec
, int type
)
3549 int ret
, sub_handle
;
3550 struct msi_desc
*msidesc
;
3551 unsigned int irq_want
;
3552 struct intel_iommu
*iommu
= NULL
;
3556 /* x86 doesn't support multiple MSI yet */
3557 if (type
== PCI_CAP_ID_MSI
&& nvec
> 1)
3560 node
= dev_to_node(&dev
->dev
);
3561 irq_want
= nr_irqs_gsi
;
3563 list_for_each_entry(msidesc
, &dev
->msi_list
, list
) {
3564 irq
= create_irq_nr(irq_want
, node
);
3568 if (!intr_remapping_enabled
)
3573 * allocate the consecutive block of IRTE's
3576 index
= msi_alloc_irte(dev
, irq
, nvec
);
3582 iommu
= map_dev_to_ir(dev
);
3588 * setup the mapping between the irq and the IRTE
3589 * base index, the sub_handle pointing to the
3590 * appropriate interrupt remap table entry.
3592 set_irte_irq(irq
, iommu
, index
, sub_handle
);
3595 ret
= setup_msi_irq(dev
, msidesc
, irq
);
3607 void arch_teardown_msi_irq(unsigned int irq
)
3612 #if defined (CONFIG_DMAR) || defined (CONFIG_INTR_REMAP)
3614 static int dmar_msi_set_affinity(unsigned int irq
, const struct cpumask
*mask
)
3616 struct irq_desc
*desc
= irq_to_desc(irq
);
3617 struct irq_cfg
*cfg
;
3621 if (set_desc_affinity(desc
, mask
, &dest
))
3624 cfg
= desc
->chip_data
;
3626 dmar_msi_read(irq
, &msg
);
3628 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
3629 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
3630 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
3631 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
3633 dmar_msi_write(irq
, &msg
);
3638 #endif /* CONFIG_SMP */
3640 static struct irq_chip dmar_msi_type
= {
3642 .unmask
= dmar_msi_unmask
,
3643 .mask
= dmar_msi_mask
,
3644 .ack
= ack_apic_edge
,
3646 .set_affinity
= dmar_msi_set_affinity
,
3648 .retrigger
= ioapic_retrigger_irq
,
3651 int arch_setup_dmar_msi(unsigned int irq
)
3656 ret
= msi_compose_msg(NULL
, irq
, &msg
, -1);
3659 dmar_msi_write(irq
, &msg
);
3660 set_irq_chip_and_handler_name(irq
, &dmar_msi_type
, handle_edge_irq
,
3666 #ifdef CONFIG_HPET_TIMER
3669 static int hpet_msi_set_affinity(unsigned int irq
, const struct cpumask
*mask
)
3671 struct irq_desc
*desc
= irq_to_desc(irq
);
3672 struct irq_cfg
*cfg
;
3676 if (set_desc_affinity(desc
, mask
, &dest
))
3679 cfg
= desc
->chip_data
;
3681 hpet_msi_read(irq
, &msg
);
3683 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
3684 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
3685 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
3686 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
3688 hpet_msi_write(irq
, &msg
);
3693 #endif /* CONFIG_SMP */
3695 static struct irq_chip ir_hpet_msi_type
= {
3696 .name
= "IR-HPET_MSI",
3697 .unmask
= hpet_msi_unmask
,
3698 .mask
= hpet_msi_mask
,
3699 #ifdef CONFIG_INTR_REMAP
3700 .ack
= ir_ack_apic_edge
,
3702 .set_affinity
= ir_set_msi_irq_affinity
,
3705 .retrigger
= ioapic_retrigger_irq
,
3708 static struct irq_chip hpet_msi_type
= {
3710 .unmask
= hpet_msi_unmask
,
3711 .mask
= hpet_msi_mask
,
3712 .ack
= ack_apic_edge
,
3714 .set_affinity
= hpet_msi_set_affinity
,
3716 .retrigger
= ioapic_retrigger_irq
,
3719 int arch_setup_hpet_msi(unsigned int irq
, unsigned int id
)
3723 struct irq_desc
*desc
= irq_to_desc(irq
);
3725 if (intr_remapping_enabled
) {
3726 struct intel_iommu
*iommu
= map_hpet_to_ir(id
);
3732 index
= alloc_irte(iommu
, irq
, 1);
3737 ret
= msi_compose_msg(NULL
, irq
, &msg
, id
);
3741 hpet_msi_write(irq
, &msg
);
3742 desc
->status
|= IRQ_MOVE_PCNTXT
;
3743 if (irq_remapped(irq
))
3744 set_irq_chip_and_handler_name(irq
, &ir_hpet_msi_type
,
3745 handle_edge_irq
, "edge");
3747 set_irq_chip_and_handler_name(irq
, &hpet_msi_type
,
3748 handle_edge_irq
, "edge");
3754 #endif /* CONFIG_PCI_MSI */
3756 * Hypertransport interrupt support
3758 #ifdef CONFIG_HT_IRQ
3762 static void target_ht_irq(unsigned int irq
, unsigned int dest
, u8 vector
)
3764 struct ht_irq_msg msg
;
3765 fetch_ht_irq_msg(irq
, &msg
);
3767 msg
.address_lo
&= ~(HT_IRQ_LOW_VECTOR_MASK
| HT_IRQ_LOW_DEST_ID_MASK
);
3768 msg
.address_hi
&= ~(HT_IRQ_HIGH_DEST_ID_MASK
);
3770 msg
.address_lo
|= HT_IRQ_LOW_VECTOR(vector
) | HT_IRQ_LOW_DEST_ID(dest
);
3771 msg
.address_hi
|= HT_IRQ_HIGH_DEST_ID(dest
);
3773 write_ht_irq_msg(irq
, &msg
);
3776 static int set_ht_irq_affinity(unsigned int irq
, const struct cpumask
*mask
)
3778 struct irq_desc
*desc
= irq_to_desc(irq
);
3779 struct irq_cfg
*cfg
;
3782 if (set_desc_affinity(desc
, mask
, &dest
))
3785 cfg
= desc
->chip_data
;
3787 target_ht_irq(irq
, dest
, cfg
->vector
);
3794 static struct irq_chip ht_irq_chip
= {
3796 .mask
= mask_ht_irq
,
3797 .unmask
= unmask_ht_irq
,
3798 .ack
= ack_apic_edge
,
3800 .set_affinity
= set_ht_irq_affinity
,
3802 .retrigger
= ioapic_retrigger_irq
,
3805 int arch_setup_ht_irq(unsigned int irq
, struct pci_dev
*dev
)
3807 struct irq_cfg
*cfg
;
3814 err
= assign_irq_vector(irq
, cfg
, apic
->target_cpus());
3816 struct ht_irq_msg msg
;
3819 dest
= apic
->cpu_mask_to_apicid_and(cfg
->domain
,
3820 apic
->target_cpus());
3822 msg
.address_hi
= HT_IRQ_HIGH_DEST_ID(dest
);
3826 HT_IRQ_LOW_DEST_ID(dest
) |
3827 HT_IRQ_LOW_VECTOR(cfg
->vector
) |
3828 ((apic
->irq_dest_mode
== 0) ?
3829 HT_IRQ_LOW_DM_PHYSICAL
:
3830 HT_IRQ_LOW_DM_LOGICAL
) |
3831 HT_IRQ_LOW_RQEOI_EDGE
|
3832 ((apic
->irq_delivery_mode
!= dest_LowestPrio
) ?
3833 HT_IRQ_LOW_MT_FIXED
:
3834 HT_IRQ_LOW_MT_ARBITRATED
) |
3835 HT_IRQ_LOW_IRQ_MASKED
;
3837 write_ht_irq_msg(irq
, &msg
);
3839 set_irq_chip_and_handler_name(irq
, &ht_irq_chip
,
3840 handle_edge_irq
, "edge");
3842 dev_printk(KERN_DEBUG
, &dev
->dev
, "irq %d for HT\n", irq
);
3846 #endif /* CONFIG_HT_IRQ */
3848 int __init
io_apic_get_redir_entries (int ioapic
)
3850 union IO_APIC_reg_01 reg_01
;
3851 unsigned long flags
;
3853 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
3854 reg_01
.raw
= io_apic_read(ioapic
, 1);
3855 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
3857 return reg_01
.bits
.entries
;
3860 void __init
probe_nr_irqs_gsi(void)
3864 nr
= acpi_probe_gsi();
3865 if (nr
> nr_irqs_gsi
) {
3868 /* for acpi=off or acpi is not compiled in */
3872 for (idx
= 0; idx
< nr_ioapics
; idx
++)
3873 nr
+= io_apic_get_redir_entries(idx
) + 1;
3875 if (nr
> nr_irqs_gsi
)
3879 printk(KERN_DEBUG
"nr_irqs_gsi: %d\n", nr_irqs_gsi
);
3882 #ifdef CONFIG_SPARSE_IRQ
3883 int __init
arch_probe_nr_irqs(void)
3887 if (nr_irqs
> (NR_VECTORS
* nr_cpu_ids
))
3888 nr_irqs
= NR_VECTORS
* nr_cpu_ids
;
3890 nr
= nr_irqs_gsi
+ 8 * nr_cpu_ids
;
3891 #if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
3893 * for MSI and HT dyn irq
3895 nr
+= nr_irqs_gsi
* 16;
3904 static int __io_apic_set_pci_routing(struct device
*dev
, int irq
,
3905 struct io_apic_irq_attr
*irq_attr
)
3907 struct irq_desc
*desc
;
3908 struct irq_cfg
*cfg
;
3911 int trigger
, polarity
;
3913 ioapic
= irq_attr
->ioapic
;
3914 if (!IO_APIC_IRQ(irq
)) {
3915 apic_printk(APIC_QUIET
,KERN_ERR
"IOAPIC[%d]: Invalid reference to IRQ 0\n",
3921 node
= dev_to_node(dev
);
3923 node
= cpu_to_node(boot_cpu_id
);
3925 desc
= irq_to_desc_alloc_node(irq
, node
);
3927 printk(KERN_INFO
"can not get irq_desc %d\n", irq
);
3931 pin
= irq_attr
->ioapic_pin
;
3932 trigger
= irq_attr
->trigger
;
3933 polarity
= irq_attr
->polarity
;
3936 * IRQs < 16 are already in the irq_2_pin[] map
3938 if (irq
>= legacy_pic
->nr_legacy_irqs
) {
3939 cfg
= desc
->chip_data
;
3940 if (add_pin_to_irq_node_nopanic(cfg
, node
, ioapic
, pin
)) {
3941 printk(KERN_INFO
"can not add pin %d for irq %d\n",
3947 setup_IO_APIC_irq(ioapic
, pin
, irq
, desc
, trigger
, polarity
);
3952 int io_apic_set_pci_routing(struct device
*dev
, int irq
,
3953 struct io_apic_irq_attr
*irq_attr
)
3957 * Avoid pin reprogramming. PRTs typically include entries
3958 * with redundant pin->gsi mappings (but unique PCI devices);
3959 * we only program the IOAPIC on the first.
3961 ioapic
= irq_attr
->ioapic
;
3962 pin
= irq_attr
->ioapic_pin
;
3963 if (test_bit(pin
, mp_ioapic_routing
[ioapic
].pin_programmed
)) {
3964 pr_debug("Pin %d-%d already programmed\n",
3965 mp_ioapics
[ioapic
].apicid
, pin
);
3968 set_bit(pin
, mp_ioapic_routing
[ioapic
].pin_programmed
);
3970 return __io_apic_set_pci_routing(dev
, irq
, irq_attr
);
3973 u8 __init
io_apic_unique_id(u8 id
)
3975 #ifdef CONFIG_X86_32
3976 if ((boot_cpu_data
.x86_vendor
== X86_VENDOR_INTEL
) &&
3977 !APIC_XAPIC(apic_version
[boot_cpu_physical_apicid
]))
3978 return io_apic_get_unique_id(nr_ioapics
, id
);
3983 DECLARE_BITMAP(used
, 256);
3985 bitmap_zero(used
, 256);
3986 for (i
= 0; i
< nr_ioapics
; i
++) {
3987 struct mpc_ioapic
*ia
= &mp_ioapics
[i
];
3988 __set_bit(ia
->apicid
, used
);
3990 if (!test_bit(id
, used
))
3992 return find_first_zero_bit(used
, 256);
3996 #ifdef CONFIG_X86_32
3997 int __init
io_apic_get_unique_id(int ioapic
, int apic_id
)
3999 union IO_APIC_reg_00 reg_00
;
4000 static physid_mask_t apic_id_map
= PHYSID_MASK_NONE
;
4002 unsigned long flags
;
4006 * The P4 platform supports up to 256 APIC IDs on two separate APIC
4007 * buses (one for LAPICs, one for IOAPICs), where predecessors only
4008 * supports up to 16 on one shared APIC bus.
4010 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
4011 * advantage of new APIC bus architecture.
4014 if (physids_empty(apic_id_map
))
4015 apic
->ioapic_phys_id_map(&phys_cpu_present_map
, &apic_id_map
);
4017 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
4018 reg_00
.raw
= io_apic_read(ioapic
, 0);
4019 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
4021 if (apic_id
>= get_physical_broadcast()) {
4022 printk(KERN_WARNING
"IOAPIC[%d]: Invalid apic_id %d, trying "
4023 "%d\n", ioapic
, apic_id
, reg_00
.bits
.ID
);
4024 apic_id
= reg_00
.bits
.ID
;
4028 * Every APIC in a system must have a unique ID or we get lots of nice
4029 * 'stuck on smp_invalidate_needed IPI wait' messages.
4031 if (apic
->check_apicid_used(&apic_id_map
, apic_id
)) {
4033 for (i
= 0; i
< get_physical_broadcast(); i
++) {
4034 if (!apic
->check_apicid_used(&apic_id_map
, i
))
4038 if (i
== get_physical_broadcast())
4039 panic("Max apic_id exceeded!\n");
4041 printk(KERN_WARNING
"IOAPIC[%d]: apic_id %d already used, "
4042 "trying %d\n", ioapic
, apic_id
, i
);
4047 apic
->apicid_to_cpu_present(apic_id
, &tmp
);
4048 physids_or(apic_id_map
, apic_id_map
, tmp
);
4050 if (reg_00
.bits
.ID
!= apic_id
) {
4051 reg_00
.bits
.ID
= apic_id
;
4053 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
4054 io_apic_write(ioapic
, 0, reg_00
.raw
);
4055 reg_00
.raw
= io_apic_read(ioapic
, 0);
4056 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
4059 if (reg_00
.bits
.ID
!= apic_id
) {
4060 printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic
);
4065 apic_printk(APIC_VERBOSE
, KERN_INFO
4066 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic
, apic_id
);
4072 int __init
io_apic_get_version(int ioapic
)
4074 union IO_APIC_reg_01 reg_01
;
4075 unsigned long flags
;
4077 raw_spin_lock_irqsave(&ioapic_lock
, flags
);
4078 reg_01
.raw
= io_apic_read(ioapic
, 1);
4079 raw_spin_unlock_irqrestore(&ioapic_lock
, flags
);
4081 return reg_01
.bits
.version
;
4084 int acpi_get_override_irq(int bus_irq
, int *trigger
, int *polarity
)
4088 if (skip_ioapic_setup
)
4091 for (i
= 0; i
< mp_irq_entries
; i
++)
4092 if (mp_irqs
[i
].irqtype
== mp_INT
&&
4093 mp_irqs
[i
].srcbusirq
== bus_irq
)
4095 if (i
>= mp_irq_entries
)
4098 *trigger
= irq_trigger(i
);
4099 *polarity
= irq_polarity(i
);
4104 * This function currently is only a helper for the i386 smp boot process where
4105 * we need to reprogram the ioredtbls to cater for the cpus which have come online
4106 * so mask in all cases should simply be apic->target_cpus()
4109 void __init
setup_ioapic_dest(void)
4111 int pin
, ioapic
, irq
, irq_entry
;
4112 struct irq_desc
*desc
;
4113 const struct cpumask
*mask
;
4115 if (skip_ioapic_setup
== 1)
4118 for (ioapic
= 0; ioapic
< nr_ioapics
; ioapic
++)
4119 for (pin
= 0; pin
< nr_ioapic_registers
[ioapic
]; pin
++) {
4120 irq_entry
= find_irq_entry(ioapic
, pin
, mp_INT
);
4121 if (irq_entry
== -1)
4123 irq
= pin_2_irq(irq_entry
, ioapic
, pin
);
4125 if ((ioapic
> 0) && (irq
> 16))
4128 desc
= irq_to_desc(irq
);
4131 * Honour affinities which have been set in early boot
4134 (IRQ_NO_BALANCING
| IRQ_AFFINITY_SET
))
4135 mask
= desc
->affinity
;
4137 mask
= apic
->target_cpus();
4139 if (intr_remapping_enabled
)
4140 set_ir_ioapic_affinity_irq_desc(desc
, mask
);
4142 set_ioapic_affinity_irq_desc(desc
, mask
);
4148 #define IOAPIC_RESOURCE_NAME_SIZE 11
4150 static struct resource
*ioapic_resources
;
4152 static struct resource
* __init
ioapic_setup_resources(int nr_ioapics
)
4155 struct resource
*res
;
4159 if (nr_ioapics
<= 0)
4162 n
= IOAPIC_RESOURCE_NAME_SIZE
+ sizeof(struct resource
);
4165 mem
= alloc_bootmem(n
);
4168 mem
+= sizeof(struct resource
) * nr_ioapics
;
4170 for (i
= 0; i
< nr_ioapics
; i
++) {
4172 res
[i
].flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
4173 snprintf(mem
, IOAPIC_RESOURCE_NAME_SIZE
, "IOAPIC %u", i
);
4174 mem
+= IOAPIC_RESOURCE_NAME_SIZE
;
4177 ioapic_resources
= res
;
4182 void __init
ioapic_init_mappings(void)
4184 unsigned long ioapic_phys
, idx
= FIX_IO_APIC_BASE_0
;
4185 struct resource
*ioapic_res
;
4188 ioapic_res
= ioapic_setup_resources(nr_ioapics
);
4189 for (i
= 0; i
< nr_ioapics
; i
++) {
4190 if (smp_found_config
) {
4191 ioapic_phys
= mp_ioapics
[i
].apicaddr
;
4192 #ifdef CONFIG_X86_32
4195 "WARNING: bogus zero IO-APIC "
4196 "address found in MPTABLE, "
4197 "disabling IO/APIC support!\n");
4198 smp_found_config
= 0;
4199 skip_ioapic_setup
= 1;
4200 goto fake_ioapic_page
;
4204 #ifdef CONFIG_X86_32
4207 ioapic_phys
= (unsigned long)alloc_bootmem_pages(PAGE_SIZE
);
4208 ioapic_phys
= __pa(ioapic_phys
);
4210 set_fixmap_nocache(idx
, ioapic_phys
);
4211 apic_printk(APIC_VERBOSE
, "mapped IOAPIC to %08lx (%08lx)\n",
4212 __fix_to_virt(idx
) + (ioapic_phys
& ~PAGE_MASK
),
4216 ioapic_res
->start
= ioapic_phys
;
4217 ioapic_res
->end
= ioapic_phys
+ IO_APIC_SLOT_SIZE
- 1;
4222 void __init
ioapic_insert_resources(void)
4225 struct resource
*r
= ioapic_resources
;
4230 "IO APIC resources couldn't be allocated.\n");
4234 for (i
= 0; i
< nr_ioapics
; i
++) {
4235 insert_resource(&iomem_resource
, r
);
4240 int mp_find_ioapic(int gsi
)
4244 /* Find the IOAPIC that manages this GSI. */
4245 for (i
= 0; i
< nr_ioapics
; i
++) {
4246 if ((gsi
>= mp_gsi_routing
[i
].gsi_base
)
4247 && (gsi
<= mp_gsi_routing
[i
].gsi_end
))
4251 printk(KERN_ERR
"ERROR: Unable to locate IOAPIC for GSI %d\n", gsi
);
4255 int mp_find_ioapic_pin(int ioapic
, int gsi
)
4257 if (WARN_ON(ioapic
== -1))
4259 if (WARN_ON(gsi
> mp_gsi_routing
[ioapic
].gsi_end
))
4262 return gsi
- mp_gsi_routing
[ioapic
].gsi_base
;
4265 static int bad_ioapic(unsigned long address
)
4267 if (nr_ioapics
>= MAX_IO_APICS
) {
4268 printk(KERN_WARNING
"WARING: Max # of I/O APICs (%d) exceeded "
4269 "(found %d), skipping\n", MAX_IO_APICS
, nr_ioapics
);
4273 printk(KERN_WARNING
"WARNING: Bogus (zero) I/O APIC address"
4274 " found in table, skipping!\n");
4280 void __init
mp_register_ioapic(int id
, u32 address
, u32 gsi_base
)
4284 if (bad_ioapic(address
))
4289 mp_ioapics
[idx
].type
= MP_IOAPIC
;
4290 mp_ioapics
[idx
].flags
= MPC_APIC_USABLE
;
4291 mp_ioapics
[idx
].apicaddr
= address
;
4293 set_fixmap_nocache(FIX_IO_APIC_BASE_0
+ idx
, address
);
4294 mp_ioapics
[idx
].apicid
= io_apic_unique_id(id
);
4295 mp_ioapics
[idx
].apicver
= io_apic_get_version(idx
);
4298 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
4299 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
4301 mp_gsi_routing
[idx
].gsi_base
= gsi_base
;
4302 mp_gsi_routing
[idx
].gsi_end
= gsi_base
+
4303 io_apic_get_redir_entries(idx
);
4305 printk(KERN_INFO
"IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
4306 "GSI %d-%d\n", idx
, mp_ioapics
[idx
].apicid
,
4307 mp_ioapics
[idx
].apicver
, mp_ioapics
[idx
].apicaddr
,
4308 mp_gsi_routing
[idx
].gsi_base
, mp_gsi_routing
[idx
].gsi_end
);
4313 /* Enable IOAPIC early just for system timer */
4314 void __init
pre_init_apic_IRQ0(void)
4316 struct irq_cfg
*cfg
;
4317 struct irq_desc
*desc
;
4319 printk(KERN_INFO
"Early APIC setup for system timer0\n");
4321 phys_cpu_present_map
= physid_mask_of_physid(boot_cpu_physical_apicid
);
4323 desc
= irq_to_desc_alloc_node(0, 0);
4328 add_pin_to_irq_node(cfg
, 0, 0, 0);
4329 set_irq_chip_and_handler_name(0, &ioapic_chip
, handle_edge_irq
, "edge");
4331 setup_IO_APIC_irq(0, 0, 0, desc
, 0, 0);