2 * Intel IO-APIC support for multi-Pentium hosts.
4 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
6 * Many thanks to Stig Venaas for trying out countless experimental
7 * patches and reporting/debugging problems patiently!
9 * (c) 1999, Multiple IO-APIC support, developed by
10 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
11 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
12 * further tested and cleaned up by Zach Brown <zab@redhat.com>
13 * and Ingo Molnar <mingo@redhat.com>
16 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
17 * thanks to Eric Gilmore
19 * for testing these extensively
20 * Paul Diefenbaugh : Added full ACPI support
24 #include <linux/interrupt.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/sched.h>
28 #include <linux/pci.h>
29 #include <linux/mc146818rtc.h>
30 #include <linux/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>
50 #include <asm/proto.h>
53 #include <asm/timer.h>
54 #include <asm/i8259.h>
56 #include <asm/msidef.h>
57 #include <asm/hypertransport.h>
58 #include <asm/setup.h>
59 #include <asm/irq_remapping.h>
61 #include <asm/uv/uv_hub.h>
62 #include <asm/uv/uv_irq.h>
65 #include <mach_apic.h>
66 #include <mach_apicdef.h>
68 #define __apicdebuginit(type) static type __init
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_SPINLOCK(ioapic_lock
);
77 static DEFINE_SPINLOCK(vector_lock
);
80 * # of IRQ routing registers
82 int nr_ioapic_registers
[MAX_IO_APICS
];
84 /* I/O APIC entries */
85 struct mp_config_ioapic mp_ioapics
[MAX_IO_APICS
];
88 /* MP IRQ source entries */
89 struct mp_config_intsrc mp_irqs
[MAX_IRQ_SOURCES
];
91 /* # of MP IRQ source entries */
94 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
95 int mp_bus_id_to_type
[MAX_MP_BUSSES
];
98 DECLARE_BITMAP(mp_bus_not_pci
, MAX_MP_BUSSES
);
100 int skip_ioapic_setup
;
102 static int __init
parse_noapic(char *str
)
104 /* disable IO-APIC */
105 disable_ioapic_setup();
108 early_param("noapic", parse_noapic
);
113 * This is performance-critical, we want to do it O(1)
115 * the indexing order of this array favors 1:1 mappings
116 * between pins and IRQs.
119 struct irq_pin_list
{
121 struct irq_pin_list
*next
;
124 static struct irq_pin_list
*get_one_free_irq_2_pin(int cpu
)
126 struct irq_pin_list
*pin
;
129 node
= cpu_to_node(cpu
);
131 pin
= kzalloc_node(sizeof(*pin
), GFP_ATOMIC
, node
);
132 printk(KERN_DEBUG
" alloc irq_2_pin on cpu %d node %d\n", cpu
, node
);
138 struct irq_pin_list
*irq_2_pin
;
140 cpumask_t old_domain
;
141 unsigned move_cleanup_count
;
143 u8 move_in_progress
: 1;
144 #ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
145 u8 move_desc_pending
: 1;
149 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
150 #ifdef CONFIG_SPARSE_IRQ
151 static struct irq_cfg irq_cfgx
[] = {
153 static struct irq_cfg irq_cfgx
[NR_IRQS
] = {
155 [0] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ0_VECTOR
, },
156 [1] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ1_VECTOR
, },
157 [2] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ2_VECTOR
, },
158 [3] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ3_VECTOR
, },
159 [4] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ4_VECTOR
, },
160 [5] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ5_VECTOR
, },
161 [6] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ6_VECTOR
, },
162 [7] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ7_VECTOR
, },
163 [8] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ8_VECTOR
, },
164 [9] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ9_VECTOR
, },
165 [10] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ10_VECTOR
, },
166 [11] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ11_VECTOR
, },
167 [12] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ12_VECTOR
, },
168 [13] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ13_VECTOR
, },
169 [14] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ14_VECTOR
, },
170 [15] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ15_VECTOR
, },
173 int __init
arch_early_irq_init(void)
176 struct irq_desc
*desc
;
181 count
= ARRAY_SIZE(irq_cfgx
);
183 for (i
= 0; i
< count
; i
++) {
184 desc
= irq_to_desc(i
);
185 desc
->chip_data
= &cfg
[i
];
191 #ifdef CONFIG_SPARSE_IRQ
192 static struct irq_cfg
*irq_cfg(unsigned int irq
)
194 struct irq_cfg
*cfg
= NULL
;
195 struct irq_desc
*desc
;
197 desc
= irq_to_desc(irq
);
199 cfg
= desc
->chip_data
;
204 static struct irq_cfg
*get_one_free_irq_cfg(int cpu
)
209 node
= cpu_to_node(cpu
);
211 cfg
= kzalloc_node(sizeof(*cfg
), GFP_ATOMIC
, node
);
212 printk(KERN_DEBUG
" alloc irq_cfg on cpu %d node %d\n", cpu
, node
);
217 int arch_init_chip_data(struct irq_desc
*desc
, int cpu
)
221 cfg
= desc
->chip_data
;
223 desc
->chip_data
= get_one_free_irq_cfg(cpu
);
224 if (!desc
->chip_data
) {
225 printk(KERN_ERR
"can not alloc irq_cfg\n");
233 #ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
236 init_copy_irq_2_pin(struct irq_cfg
*old_cfg
, struct irq_cfg
*cfg
, int cpu
)
238 struct irq_pin_list
*old_entry
, *head
, *tail
, *entry
;
240 cfg
->irq_2_pin
= NULL
;
241 old_entry
= old_cfg
->irq_2_pin
;
245 entry
= get_one_free_irq_2_pin(cpu
);
249 entry
->apic
= old_entry
->apic
;
250 entry
->pin
= old_entry
->pin
;
253 old_entry
= old_entry
->next
;
255 entry
= get_one_free_irq_2_pin(cpu
);
263 /* still use the old one */
266 entry
->apic
= old_entry
->apic
;
267 entry
->pin
= old_entry
->pin
;
270 old_entry
= old_entry
->next
;
274 cfg
->irq_2_pin
= head
;
277 static void free_irq_2_pin(struct irq_cfg
*old_cfg
, struct irq_cfg
*cfg
)
279 struct irq_pin_list
*entry
, *next
;
281 if (old_cfg
->irq_2_pin
== cfg
->irq_2_pin
)
284 entry
= old_cfg
->irq_2_pin
;
291 old_cfg
->irq_2_pin
= NULL
;
294 void arch_init_copy_chip_data(struct irq_desc
*old_desc
,
295 struct irq_desc
*desc
, int cpu
)
298 struct irq_cfg
*old_cfg
;
300 cfg
= get_one_free_irq_cfg(cpu
);
305 desc
->chip_data
= cfg
;
307 old_cfg
= old_desc
->chip_data
;
309 memcpy(cfg
, old_cfg
, sizeof(struct irq_cfg
));
311 init_copy_irq_2_pin(old_cfg
, cfg
, cpu
);
314 static void free_irq_cfg(struct irq_cfg
*old_cfg
)
319 void arch_free_chip_data(struct irq_desc
*old_desc
, struct irq_desc
*desc
)
321 struct irq_cfg
*old_cfg
, *cfg
;
323 old_cfg
= old_desc
->chip_data
;
324 cfg
= desc
->chip_data
;
330 free_irq_2_pin(old_cfg
, cfg
);
331 free_irq_cfg(old_cfg
);
332 old_desc
->chip_data
= NULL
;
336 static void set_extra_move_desc(struct irq_desc
*desc
, cpumask_t mask
)
338 struct irq_cfg
*cfg
= desc
->chip_data
;
340 if (!cfg
->move_in_progress
) {
341 /* it means that domain is not changed */
342 if (!cpus_intersects(desc
->affinity
, mask
))
343 cfg
->move_desc_pending
= 1;
349 static struct irq_cfg
*irq_cfg(unsigned int irq
)
351 return irq
< nr_irqs
? irq_cfgx
+ irq
: NULL
;
356 #ifndef CONFIG_NUMA_MIGRATE_IRQ_DESC
357 static inline void set_extra_move_desc(struct irq_desc
*desc
, cpumask_t mask
)
364 unsigned int unused
[3];
368 static __attribute_const__
struct io_apic __iomem
*io_apic_base(int idx
)
370 return (void __iomem
*) __fix_to_virt(FIX_IO_APIC_BASE_0
+ idx
)
371 + (mp_ioapics
[idx
].mp_apicaddr
& ~PAGE_MASK
);
374 static inline unsigned int io_apic_read(unsigned int apic
, unsigned int reg
)
376 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
377 writel(reg
, &io_apic
->index
);
378 return readl(&io_apic
->data
);
381 static inline void io_apic_write(unsigned int apic
, unsigned int reg
, unsigned int value
)
383 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
384 writel(reg
, &io_apic
->index
);
385 writel(value
, &io_apic
->data
);
389 * Re-write a value: to be used for read-modify-write
390 * cycles where the read already set up the index register.
392 * Older SiS APIC requires we rewrite the index register
394 static inline void io_apic_modify(unsigned int apic
, unsigned int reg
, unsigned int value
)
396 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
399 writel(reg
, &io_apic
->index
);
400 writel(value
, &io_apic
->data
);
403 static bool io_apic_level_ack_pending(struct irq_cfg
*cfg
)
405 struct irq_pin_list
*entry
;
408 spin_lock_irqsave(&ioapic_lock
, flags
);
409 entry
= cfg
->irq_2_pin
;
417 reg
= io_apic_read(entry
->apic
, 0x10 + pin
*2);
418 /* Is the remote IRR bit set? */
419 if (reg
& IO_APIC_REDIR_REMOTE_IRR
) {
420 spin_unlock_irqrestore(&ioapic_lock
, flags
);
427 spin_unlock_irqrestore(&ioapic_lock
, flags
);
433 struct { u32 w1
, w2
; };
434 struct IO_APIC_route_entry entry
;
437 static struct IO_APIC_route_entry
ioapic_read_entry(int apic
, int pin
)
439 union entry_union eu
;
441 spin_lock_irqsave(&ioapic_lock
, flags
);
442 eu
.w1
= io_apic_read(apic
, 0x10 + 2 * pin
);
443 eu
.w2
= io_apic_read(apic
, 0x11 + 2 * pin
);
444 spin_unlock_irqrestore(&ioapic_lock
, flags
);
449 * When we write a new IO APIC routing entry, we need to write the high
450 * word first! If the mask bit in the low word is clear, we will enable
451 * the interrupt, and we need to make sure the entry is fully populated
452 * before that happens.
455 __ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
457 union entry_union eu
;
459 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
460 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
463 static void ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
466 spin_lock_irqsave(&ioapic_lock
, flags
);
467 __ioapic_write_entry(apic
, pin
, e
);
468 spin_unlock_irqrestore(&ioapic_lock
, flags
);
472 * When we mask an IO APIC routing entry, we need to write the low
473 * word first, in order to set the mask bit before we change the
476 static void ioapic_mask_entry(int apic
, int pin
)
479 union entry_union eu
= { .entry
.mask
= 1 };
481 spin_lock_irqsave(&ioapic_lock
, flags
);
482 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
483 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
484 spin_unlock_irqrestore(&ioapic_lock
, flags
);
488 static void __target_IO_APIC_irq(unsigned int irq
, unsigned int dest
, struct irq_cfg
*cfg
)
491 struct irq_pin_list
*entry
;
492 u8 vector
= cfg
->vector
;
494 entry
= cfg
->irq_2_pin
;
503 #ifdef CONFIG_INTR_REMAP
505 * With interrupt-remapping, destination information comes
506 * from interrupt-remapping table entry.
508 if (!irq_remapped(irq
))
509 io_apic_write(apic
, 0x11 + pin
*2, dest
);
511 io_apic_write(apic
, 0x11 + pin
*2, dest
);
513 reg
= io_apic_read(apic
, 0x10 + pin
*2);
514 reg
&= ~IO_APIC_REDIR_VECTOR_MASK
;
516 io_apic_modify(apic
, 0x10 + pin
*2, reg
);
523 static int assign_irq_vector(int irq
, struct irq_cfg
*cfg
, cpumask_t mask
);
525 static void set_ioapic_affinity_irq_desc(struct irq_desc
*desc
, cpumask_t mask
)
533 cpus_and(tmp
, mask
, cpu_online_map
);
538 cfg
= desc
->chip_data
;
539 if (assign_irq_vector(irq
, cfg
, mask
))
542 set_extra_move_desc(desc
, mask
);
544 cpus_and(tmp
, cfg
->domain
, mask
);
545 dest
= cpu_mask_to_apicid(tmp
);
547 * Only the high 8 bits are valid.
549 dest
= SET_APIC_LOGICAL_ID(dest
);
551 spin_lock_irqsave(&ioapic_lock
, flags
);
552 __target_IO_APIC_irq(irq
, dest
, cfg
);
553 desc
->affinity
= mask
;
554 spin_unlock_irqrestore(&ioapic_lock
, flags
);
557 static void set_ioapic_affinity_irq(unsigned int irq
, cpumask_t mask
)
559 struct irq_desc
*desc
;
561 desc
= irq_to_desc(irq
);
563 set_ioapic_affinity_irq_desc(desc
, mask
);
565 #endif /* CONFIG_SMP */
568 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
569 * shared ISA-space IRQs, so we have to support them. We are super
570 * fast in the common case, and fast for shared ISA-space IRQs.
572 static void add_pin_to_irq_cpu(struct irq_cfg
*cfg
, int cpu
, int apic
, int pin
)
574 struct irq_pin_list
*entry
;
576 entry
= cfg
->irq_2_pin
;
578 entry
= get_one_free_irq_2_pin(cpu
);
580 printk(KERN_ERR
"can not alloc irq_2_pin to add %d - %d\n",
584 cfg
->irq_2_pin
= entry
;
590 while (entry
->next
) {
591 /* not again, please */
592 if (entry
->apic
== apic
&& entry
->pin
== pin
)
598 entry
->next
= get_one_free_irq_2_pin(cpu
);
605 * Reroute an IRQ to a different pin.
607 static void __init
replace_pin_at_irq_cpu(struct irq_cfg
*cfg
, int cpu
,
608 int oldapic
, int oldpin
,
609 int newapic
, int newpin
)
611 struct irq_pin_list
*entry
= cfg
->irq_2_pin
;
615 if (entry
->apic
== oldapic
&& entry
->pin
== oldpin
) {
616 entry
->apic
= newapic
;
619 /* every one is different, right? */
625 /* why? call replace before add? */
627 add_pin_to_irq_cpu(cfg
, cpu
, newapic
, newpin
);
630 static inline void io_apic_modify_irq(struct irq_cfg
*cfg
,
631 int mask_and
, int mask_or
,
632 void (*final
)(struct irq_pin_list
*entry
))
635 struct irq_pin_list
*entry
;
637 for (entry
= cfg
->irq_2_pin
; entry
!= NULL
; entry
= entry
->next
) {
640 reg
= io_apic_read(entry
->apic
, 0x10 + pin
* 2);
643 io_apic_modify(entry
->apic
, 0x10 + pin
* 2, reg
);
649 static void __unmask_IO_APIC_irq(struct irq_cfg
*cfg
)
651 io_apic_modify_irq(cfg
, ~IO_APIC_REDIR_MASKED
, 0, NULL
);
655 void io_apic_sync(struct irq_pin_list
*entry
)
658 * Synchronize the IO-APIC and the CPU by doing
659 * a dummy read from the IO-APIC
661 struct io_apic __iomem
*io_apic
;
662 io_apic
= io_apic_base(entry
->apic
);
663 readl(&io_apic
->data
);
666 static void __mask_IO_APIC_irq(struct irq_cfg
*cfg
)
668 io_apic_modify_irq(cfg
, ~0, IO_APIC_REDIR_MASKED
, &io_apic_sync
);
670 #else /* CONFIG_X86_32 */
671 static void __mask_IO_APIC_irq(struct irq_cfg
*cfg
)
673 io_apic_modify_irq(cfg
, ~0, IO_APIC_REDIR_MASKED
, NULL
);
676 static void __mask_and_edge_IO_APIC_irq(struct irq_cfg
*cfg
)
678 io_apic_modify_irq(cfg
, ~IO_APIC_REDIR_LEVEL_TRIGGER
,
679 IO_APIC_REDIR_MASKED
, NULL
);
682 static void __unmask_and_level_IO_APIC_irq(struct irq_cfg
*cfg
)
684 io_apic_modify_irq(cfg
, ~IO_APIC_REDIR_MASKED
,
685 IO_APIC_REDIR_LEVEL_TRIGGER
, NULL
);
687 #endif /* CONFIG_X86_32 */
689 static void mask_IO_APIC_irq_desc(struct irq_desc
*desc
)
691 struct irq_cfg
*cfg
= desc
->chip_data
;
696 spin_lock_irqsave(&ioapic_lock
, flags
);
697 __mask_IO_APIC_irq(cfg
);
698 spin_unlock_irqrestore(&ioapic_lock
, flags
);
701 static void unmask_IO_APIC_irq_desc(struct irq_desc
*desc
)
703 struct irq_cfg
*cfg
= desc
->chip_data
;
706 spin_lock_irqsave(&ioapic_lock
, flags
);
707 __unmask_IO_APIC_irq(cfg
);
708 spin_unlock_irqrestore(&ioapic_lock
, flags
);
711 static void mask_IO_APIC_irq(unsigned int irq
)
713 struct irq_desc
*desc
= irq_to_desc(irq
);
715 mask_IO_APIC_irq_desc(desc
);
717 static void unmask_IO_APIC_irq(unsigned int irq
)
719 struct irq_desc
*desc
= irq_to_desc(irq
);
721 unmask_IO_APIC_irq_desc(desc
);
724 static void clear_IO_APIC_pin(unsigned int apic
, unsigned int pin
)
726 struct IO_APIC_route_entry entry
;
728 /* Check delivery_mode to be sure we're not clearing an SMI pin */
729 entry
= ioapic_read_entry(apic
, pin
);
730 if (entry
.delivery_mode
== dest_SMI
)
733 * Disable it in the IO-APIC irq-routing table:
735 ioapic_mask_entry(apic
, pin
);
738 static void clear_IO_APIC (void)
742 for (apic
= 0; apic
< nr_ioapics
; apic
++)
743 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++)
744 clear_IO_APIC_pin(apic
, pin
);
747 #if !defined(CONFIG_SMP) && defined(CONFIG_X86_32)
748 void send_IPI_self(int vector
)
755 apic_wait_icr_idle();
756 cfg
= APIC_DM_FIXED
| APIC_DEST_SELF
| vector
| APIC_DEST_LOGICAL
;
758 * Send the IPI. The write to APIC_ICR fires this off.
760 apic_write(APIC_ICR
, cfg
);
762 #endif /* !CONFIG_SMP && CONFIG_X86_32*/
766 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
767 * specific CPU-side IRQs.
771 static int pirq_entries
[MAX_PIRQS
];
772 static int pirqs_enabled
;
774 static int __init
ioapic_pirq_setup(char *str
)
777 int ints
[MAX_PIRQS
+1];
779 get_options(str
, ARRAY_SIZE(ints
), ints
);
781 for (i
= 0; i
< MAX_PIRQS
; i
++)
782 pirq_entries
[i
] = -1;
785 apic_printk(APIC_VERBOSE
, KERN_INFO
786 "PIRQ redirection, working around broken MP-BIOS.\n");
788 if (ints
[0] < MAX_PIRQS
)
791 for (i
= 0; i
< max
; i
++) {
792 apic_printk(APIC_VERBOSE
, KERN_DEBUG
793 "... PIRQ%d -> IRQ %d\n", i
, ints
[i
+1]);
795 * PIRQs are mapped upside down, usually.
797 pirq_entries
[MAX_PIRQS
-i
-1] = ints
[i
+1];
802 __setup("pirq=", ioapic_pirq_setup
);
803 #endif /* CONFIG_X86_32 */
805 #ifdef CONFIG_INTR_REMAP
806 /* I/O APIC RTE contents at the OS boot up */
807 static struct IO_APIC_route_entry
*early_ioapic_entries
[MAX_IO_APICS
];
810 * Saves and masks all the unmasked IO-APIC RTE's
812 int save_mask_IO_APIC_setup(void)
814 union IO_APIC_reg_01 reg_01
;
819 * The number of IO-APIC IRQ registers (== #pins):
821 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
822 spin_lock_irqsave(&ioapic_lock
, flags
);
823 reg_01
.raw
= io_apic_read(apic
, 1);
824 spin_unlock_irqrestore(&ioapic_lock
, flags
);
825 nr_ioapic_registers
[apic
] = reg_01
.bits
.entries
+1;
828 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
829 early_ioapic_entries
[apic
] =
830 kzalloc(sizeof(struct IO_APIC_route_entry
) *
831 nr_ioapic_registers
[apic
], GFP_KERNEL
);
832 if (!early_ioapic_entries
[apic
])
836 for (apic
= 0; apic
< nr_ioapics
; apic
++)
837 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
838 struct IO_APIC_route_entry entry
;
840 entry
= early_ioapic_entries
[apic
][pin
] =
841 ioapic_read_entry(apic
, pin
);
844 ioapic_write_entry(apic
, pin
, entry
);
852 kfree(early_ioapic_entries
[apic
--]);
853 memset(early_ioapic_entries
, 0,
854 ARRAY_SIZE(early_ioapic_entries
));
859 void restore_IO_APIC_setup(void)
863 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
864 if (!early_ioapic_entries
[apic
])
866 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++)
867 ioapic_write_entry(apic
, pin
,
868 early_ioapic_entries
[apic
][pin
]);
869 kfree(early_ioapic_entries
[apic
]);
870 early_ioapic_entries
[apic
] = NULL
;
874 void reinit_intr_remapped_IO_APIC(int intr_remapping
)
877 * for now plain restore of previous settings.
878 * TBD: In the case of OS enabling interrupt-remapping,
879 * IO-APIC RTE's need to be setup to point to interrupt-remapping
880 * table entries. for now, do a plain restore, and wait for
881 * the setup_IO_APIC_irqs() to do proper initialization.
883 restore_IO_APIC_setup();
888 * Find the IRQ entry number of a certain pin.
890 static int find_irq_entry(int apic
, int pin
, int type
)
894 for (i
= 0; i
< mp_irq_entries
; i
++)
895 if (mp_irqs
[i
].mp_irqtype
== type
&&
896 (mp_irqs
[i
].mp_dstapic
== mp_ioapics
[apic
].mp_apicid
||
897 mp_irqs
[i
].mp_dstapic
== MP_APIC_ALL
) &&
898 mp_irqs
[i
].mp_dstirq
== pin
)
905 * Find the pin to which IRQ[irq] (ISA) is connected
907 static int __init
find_isa_irq_pin(int irq
, int type
)
911 for (i
= 0; i
< mp_irq_entries
; i
++) {
912 int lbus
= mp_irqs
[i
].mp_srcbus
;
914 if (test_bit(lbus
, mp_bus_not_pci
) &&
915 (mp_irqs
[i
].mp_irqtype
== type
) &&
916 (mp_irqs
[i
].mp_srcbusirq
== irq
))
918 return mp_irqs
[i
].mp_dstirq
;
923 static int __init
find_isa_irq_apic(int irq
, int type
)
927 for (i
= 0; i
< mp_irq_entries
; i
++) {
928 int lbus
= mp_irqs
[i
].mp_srcbus
;
930 if (test_bit(lbus
, mp_bus_not_pci
) &&
931 (mp_irqs
[i
].mp_irqtype
== type
) &&
932 (mp_irqs
[i
].mp_srcbusirq
== irq
))
935 if (i
< mp_irq_entries
) {
937 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
938 if (mp_ioapics
[apic
].mp_apicid
== mp_irqs
[i
].mp_dstapic
)
947 * Find a specific PCI IRQ entry.
948 * Not an __init, possibly needed by modules
950 static int pin_2_irq(int idx
, int apic
, int pin
);
952 int IO_APIC_get_PCI_irq_vector(int bus
, int slot
, int pin
)
954 int apic
, i
, best_guess
= -1;
956 apic_printk(APIC_DEBUG
, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
958 if (test_bit(bus
, mp_bus_not_pci
)) {
959 apic_printk(APIC_VERBOSE
, "PCI BIOS passed nonexistent PCI bus %d!\n", bus
);
962 for (i
= 0; i
< mp_irq_entries
; i
++) {
963 int lbus
= mp_irqs
[i
].mp_srcbus
;
965 for (apic
= 0; apic
< nr_ioapics
; apic
++)
966 if (mp_ioapics
[apic
].mp_apicid
== mp_irqs
[i
].mp_dstapic
||
967 mp_irqs
[i
].mp_dstapic
== MP_APIC_ALL
)
970 if (!test_bit(lbus
, mp_bus_not_pci
) &&
971 !mp_irqs
[i
].mp_irqtype
&&
973 (slot
== ((mp_irqs
[i
].mp_srcbusirq
>> 2) & 0x1f))) {
974 int irq
= pin_2_irq(i
,apic
,mp_irqs
[i
].mp_dstirq
);
976 if (!(apic
|| IO_APIC_IRQ(irq
)))
979 if (pin
== (mp_irqs
[i
].mp_srcbusirq
& 3))
982 * Use the first all-but-pin matching entry as a
983 * best-guess fuzzy result for broken mptables.
992 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector
);
994 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
996 * EISA Edge/Level control register, ELCR
998 static int EISA_ELCR(unsigned int irq
)
1000 if (irq
< NR_IRQS_LEGACY
) {
1001 unsigned int port
= 0x4d0 + (irq
>> 3);
1002 return (inb(port
) >> (irq
& 7)) & 1;
1004 apic_printk(APIC_VERBOSE
, KERN_INFO
1005 "Broken MPtable reports ISA irq %d\n", irq
);
1011 /* ISA interrupts are always polarity zero edge triggered,
1012 * when listed as conforming in the MP table. */
1014 #define default_ISA_trigger(idx) (0)
1015 #define default_ISA_polarity(idx) (0)
1017 /* EISA interrupts are always polarity zero and can be edge or level
1018 * trigger depending on the ELCR value. If an interrupt is listed as
1019 * EISA conforming in the MP table, that means its trigger type must
1020 * be read in from the ELCR */
1022 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].mp_srcbusirq))
1023 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
1025 /* PCI interrupts are always polarity one level triggered,
1026 * when listed as conforming in the MP table. */
1028 #define default_PCI_trigger(idx) (1)
1029 #define default_PCI_polarity(idx) (1)
1031 /* MCA interrupts are always polarity zero level triggered,
1032 * when listed as conforming in the MP table. */
1034 #define default_MCA_trigger(idx) (1)
1035 #define default_MCA_polarity(idx) default_ISA_polarity(idx)
1037 static int MPBIOS_polarity(int idx
)
1039 int bus
= mp_irqs
[idx
].mp_srcbus
;
1043 * Determine IRQ line polarity (high active or low active):
1045 switch (mp_irqs
[idx
].mp_irqflag
& 3)
1047 case 0: /* conforms, ie. bus-type dependent polarity */
1048 if (test_bit(bus
, mp_bus_not_pci
))
1049 polarity
= default_ISA_polarity(idx
);
1051 polarity
= default_PCI_polarity(idx
);
1053 case 1: /* high active */
1058 case 2: /* reserved */
1060 printk(KERN_WARNING
"broken BIOS!!\n");
1064 case 3: /* low active */
1069 default: /* invalid */
1071 printk(KERN_WARNING
"broken BIOS!!\n");
1079 static int MPBIOS_trigger(int idx
)
1081 int bus
= mp_irqs
[idx
].mp_srcbus
;
1085 * Determine IRQ trigger mode (edge or level sensitive):
1087 switch ((mp_irqs
[idx
].mp_irqflag
>>2) & 3)
1089 case 0: /* conforms, ie. bus-type dependent */
1090 if (test_bit(bus
, mp_bus_not_pci
))
1091 trigger
= default_ISA_trigger(idx
);
1093 trigger
= default_PCI_trigger(idx
);
1094 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
1095 switch (mp_bus_id_to_type
[bus
]) {
1096 case MP_BUS_ISA
: /* ISA pin */
1098 /* set before the switch */
1101 case MP_BUS_EISA
: /* EISA pin */
1103 trigger
= default_EISA_trigger(idx
);
1106 case MP_BUS_PCI
: /* PCI pin */
1108 /* set before the switch */
1111 case MP_BUS_MCA
: /* MCA pin */
1113 trigger
= default_MCA_trigger(idx
);
1118 printk(KERN_WARNING
"broken BIOS!!\n");
1130 case 2: /* reserved */
1132 printk(KERN_WARNING
"broken BIOS!!\n");
1141 default: /* invalid */
1143 printk(KERN_WARNING
"broken BIOS!!\n");
1151 static inline int irq_polarity(int idx
)
1153 return MPBIOS_polarity(idx
);
1156 static inline int irq_trigger(int idx
)
1158 return MPBIOS_trigger(idx
);
1161 int (*ioapic_renumber_irq
)(int ioapic
, int irq
);
1162 static int pin_2_irq(int idx
, int apic
, int pin
)
1165 int bus
= mp_irqs
[idx
].mp_srcbus
;
1168 * Debugging check, we are in big trouble if this message pops up!
1170 if (mp_irqs
[idx
].mp_dstirq
!= pin
)
1171 printk(KERN_ERR
"broken BIOS or MPTABLE parser, ayiee!!\n");
1173 if (test_bit(bus
, mp_bus_not_pci
)) {
1174 irq
= mp_irqs
[idx
].mp_srcbusirq
;
1177 * PCI IRQs are mapped in order
1181 irq
+= nr_ioapic_registers
[i
++];
1184 * For MPS mode, so far only needed by ES7000 platform
1186 if (ioapic_renumber_irq
)
1187 irq
= ioapic_renumber_irq(apic
, irq
);
1190 #ifdef CONFIG_X86_32
1192 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1194 if ((pin
>= 16) && (pin
<= 23)) {
1195 if (pirq_entries
[pin
-16] != -1) {
1196 if (!pirq_entries
[pin
-16]) {
1197 apic_printk(APIC_VERBOSE
, KERN_DEBUG
1198 "disabling PIRQ%d\n", pin
-16);
1200 irq
= pirq_entries
[pin
-16];
1201 apic_printk(APIC_VERBOSE
, KERN_DEBUG
1202 "using PIRQ%d -> IRQ %d\n",
1212 void lock_vector_lock(void)
1214 /* Used to the online set of cpus does not change
1215 * during assign_irq_vector.
1217 spin_lock(&vector_lock
);
1220 void unlock_vector_lock(void)
1222 spin_unlock(&vector_lock
);
1225 static int __assign_irq_vector(int irq
, struct irq_cfg
*cfg
, cpumask_t mask
)
1228 * NOTE! The local APIC isn't very good at handling
1229 * multiple interrupts at the same interrupt level.
1230 * As the interrupt level is determined by taking the
1231 * vector number and shifting that right by 4, we
1232 * want to spread these out a bit so that they don't
1233 * all fall in the same interrupt level.
1235 * Also, we've got to be careful not to trash gate
1236 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1238 static int current_vector
= FIRST_DEVICE_VECTOR
, current_offset
= 0;
1239 unsigned int old_vector
;
1242 if ((cfg
->move_in_progress
) || cfg
->move_cleanup_count
)
1245 /* Only try and allocate irqs on cpus that are present */
1246 cpus_and(mask
, mask
, cpu_online_map
);
1248 old_vector
= cfg
->vector
;
1251 cpus_and(tmp
, cfg
->domain
, mask
);
1252 if (!cpus_empty(tmp
))
1256 for_each_cpu_mask_nr(cpu
, mask
) {
1257 cpumask_t domain
, new_mask
;
1261 domain
= vector_allocation_domain(cpu
);
1262 cpus_and(new_mask
, domain
, cpu_online_map
);
1264 vector
= current_vector
;
1265 offset
= current_offset
;
1268 if (vector
>= first_system_vector
) {
1269 /* If we run out of vectors on large boxen, must share them. */
1270 offset
= (offset
+ 1) % 8;
1271 vector
= FIRST_DEVICE_VECTOR
+ offset
;
1273 if (unlikely(current_vector
== vector
))
1275 #ifdef CONFIG_X86_64
1276 if (vector
== IA32_SYSCALL_VECTOR
)
1279 if (vector
== SYSCALL_VECTOR
)
1282 for_each_cpu_mask_nr(new_cpu
, new_mask
)
1283 if (per_cpu(vector_irq
, new_cpu
)[vector
] != -1)
1286 current_vector
= vector
;
1287 current_offset
= offset
;
1289 cfg
->move_in_progress
= 1;
1290 cfg
->old_domain
= cfg
->domain
;
1292 for_each_cpu_mask_nr(new_cpu
, new_mask
)
1293 per_cpu(vector_irq
, new_cpu
)[vector
] = irq
;
1294 cfg
->vector
= vector
;
1295 cfg
->domain
= domain
;
1301 static int assign_irq_vector(int irq
, struct irq_cfg
*cfg
, cpumask_t mask
)
1304 unsigned long flags
;
1306 spin_lock_irqsave(&vector_lock
, flags
);
1307 err
= __assign_irq_vector(irq
, cfg
, mask
);
1308 spin_unlock_irqrestore(&vector_lock
, flags
);
1312 static void __clear_irq_vector(int irq
, struct irq_cfg
*cfg
)
1317 BUG_ON(!cfg
->vector
);
1319 vector
= cfg
->vector
;
1320 cpus_and(mask
, cfg
->domain
, cpu_online_map
);
1321 for_each_cpu_mask_nr(cpu
, mask
)
1322 per_cpu(vector_irq
, cpu
)[vector
] = -1;
1325 cpus_clear(cfg
->domain
);
1327 if (likely(!cfg
->move_in_progress
))
1329 cpus_and(mask
, cfg
->old_domain
, cpu_online_map
);
1330 for_each_cpu_mask_nr(cpu
, mask
) {
1331 for (vector
= FIRST_EXTERNAL_VECTOR
; vector
< NR_VECTORS
;
1333 if (per_cpu(vector_irq
, cpu
)[vector
] != irq
)
1335 per_cpu(vector_irq
, cpu
)[vector
] = -1;
1339 cfg
->move_in_progress
= 0;
1342 void __setup_vector_irq(int cpu
)
1344 /* Initialize vector_irq on a new cpu */
1345 /* This function must be called with vector_lock held */
1347 struct irq_cfg
*cfg
;
1348 struct irq_desc
*desc
;
1350 /* Mark the inuse vectors */
1351 for_each_irq_desc(irq
, desc
) {
1352 cfg
= desc
->chip_data
;
1353 if (!cpu_isset(cpu
, cfg
->domain
))
1355 vector
= cfg
->vector
;
1356 per_cpu(vector_irq
, cpu
)[vector
] = irq
;
1358 /* Mark the free vectors */
1359 for (vector
= 0; vector
< NR_VECTORS
; ++vector
) {
1360 irq
= per_cpu(vector_irq
, cpu
)[vector
];
1365 if (!cpu_isset(cpu
, cfg
->domain
))
1366 per_cpu(vector_irq
, cpu
)[vector
] = -1;
1370 static struct irq_chip ioapic_chip
;
1371 #ifdef CONFIG_INTR_REMAP
1372 static struct irq_chip ir_ioapic_chip
;
1375 #define IOAPIC_AUTO -1
1376 #define IOAPIC_EDGE 0
1377 #define IOAPIC_LEVEL 1
1379 #ifdef CONFIG_X86_32
1380 static inline int IO_APIC_irq_trigger(int irq
)
1384 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1385 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1386 idx
= find_irq_entry(apic
, pin
, mp_INT
);
1387 if ((idx
!= -1) && (irq
== pin_2_irq(idx
, apic
, pin
)))
1388 return irq_trigger(idx
);
1392 * nonexistent IRQs are edge default
1397 static inline int IO_APIC_irq_trigger(int irq
)
1403 static void ioapic_register_intr(int irq
, struct irq_desc
*desc
, unsigned long trigger
)
1406 if ((trigger
== IOAPIC_AUTO
&& IO_APIC_irq_trigger(irq
)) ||
1407 trigger
== IOAPIC_LEVEL
)
1408 desc
->status
|= IRQ_LEVEL
;
1410 desc
->status
&= ~IRQ_LEVEL
;
1412 #ifdef CONFIG_INTR_REMAP
1413 if (irq_remapped(irq
)) {
1414 desc
->status
|= IRQ_MOVE_PCNTXT
;
1416 set_irq_chip_and_handler_name(irq
, &ir_ioapic_chip
,
1420 set_irq_chip_and_handler_name(irq
, &ir_ioapic_chip
,
1421 handle_edge_irq
, "edge");
1425 if ((trigger
== IOAPIC_AUTO
&& IO_APIC_irq_trigger(irq
)) ||
1426 trigger
== IOAPIC_LEVEL
)
1427 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
1431 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
1432 handle_edge_irq
, "edge");
1435 static int setup_ioapic_entry(int apic
, int irq
,
1436 struct IO_APIC_route_entry
*entry
,
1437 unsigned int destination
, int trigger
,
1438 int polarity
, int vector
)
1441 * add it to the IO-APIC irq-routing table:
1443 memset(entry
,0,sizeof(*entry
));
1445 #ifdef CONFIG_INTR_REMAP
1446 if (intr_remapping_enabled
) {
1447 struct intel_iommu
*iommu
= map_ioapic_to_ir(apic
);
1449 struct IR_IO_APIC_route_entry
*ir_entry
=
1450 (struct IR_IO_APIC_route_entry
*) entry
;
1454 panic("No mapping iommu for ioapic %d\n", apic
);
1456 index
= alloc_irte(iommu
, irq
, 1);
1458 panic("Failed to allocate IRTE for ioapic %d\n", apic
);
1460 memset(&irte
, 0, sizeof(irte
));
1463 irte
.dst_mode
= INT_DEST_MODE
;
1464 irte
.trigger_mode
= trigger
;
1465 irte
.dlvry_mode
= INT_DELIVERY_MODE
;
1466 irte
.vector
= vector
;
1467 irte
.dest_id
= IRTE_DEST(destination
);
1469 modify_irte(irq
, &irte
);
1471 ir_entry
->index2
= (index
>> 15) & 0x1;
1473 ir_entry
->format
= 1;
1474 ir_entry
->index
= (index
& 0x7fff);
1478 entry
->delivery_mode
= INT_DELIVERY_MODE
;
1479 entry
->dest_mode
= INT_DEST_MODE
;
1480 entry
->dest
= destination
;
1483 entry
->mask
= 0; /* enable IRQ */
1484 entry
->trigger
= trigger
;
1485 entry
->polarity
= polarity
;
1486 entry
->vector
= vector
;
1488 /* Mask level triggered irqs.
1489 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
1496 static void setup_IO_APIC_irq(int apic
, int pin
, unsigned int irq
, struct irq_desc
*desc
,
1497 int trigger
, int polarity
)
1499 struct irq_cfg
*cfg
;
1500 struct IO_APIC_route_entry entry
;
1503 if (!IO_APIC_IRQ(irq
))
1506 cfg
= desc
->chip_data
;
1509 if (assign_irq_vector(irq
, cfg
, mask
))
1512 cpus_and(mask
, cfg
->domain
, mask
);
1514 apic_printk(APIC_VERBOSE
,KERN_DEBUG
1515 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
1516 "IRQ %d Mode:%i Active:%i)\n",
1517 apic
, mp_ioapics
[apic
].mp_apicid
, pin
, cfg
->vector
,
1518 irq
, trigger
, polarity
);
1521 if (setup_ioapic_entry(mp_ioapics
[apic
].mp_apicid
, irq
, &entry
,
1522 cpu_mask_to_apicid(mask
), trigger
, polarity
,
1524 printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
1525 mp_ioapics
[apic
].mp_apicid
, pin
);
1526 __clear_irq_vector(irq
, cfg
);
1530 ioapic_register_intr(irq
, desc
, trigger
);
1531 if (irq
< NR_IRQS_LEGACY
)
1532 disable_8259A_irq(irq
);
1534 ioapic_write_entry(apic
, pin
, entry
);
1537 static void __init
setup_IO_APIC_irqs(void)
1539 int apic
, pin
, idx
, irq
;
1541 struct irq_desc
*desc
;
1542 struct irq_cfg
*cfg
;
1543 int cpu
= boot_cpu_id
;
1545 apic_printk(APIC_VERBOSE
, KERN_DEBUG
"init IO_APIC IRQs\n");
1547 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1548 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1550 idx
= find_irq_entry(apic
, pin
, mp_INT
);
1554 apic_printk(APIC_VERBOSE
,
1555 KERN_DEBUG
" %d-%d",
1556 mp_ioapics
[apic
].mp_apicid
,
1559 apic_printk(APIC_VERBOSE
, " %d-%d",
1560 mp_ioapics
[apic
].mp_apicid
,
1565 apic_printk(APIC_VERBOSE
,
1566 " (apicid-pin) not connected\n");
1570 irq
= pin_2_irq(idx
, apic
, pin
);
1571 #ifdef CONFIG_X86_32
1572 if (multi_timer_check(apic
, irq
))
1575 desc
= irq_to_desc_alloc_cpu(irq
, cpu
);
1577 printk(KERN_INFO
"can not get irq_desc for %d\n", irq
);
1580 cfg
= desc
->chip_data
;
1581 add_pin_to_irq_cpu(cfg
, cpu
, apic
, pin
);
1583 setup_IO_APIC_irq(apic
, pin
, irq
, desc
,
1584 irq_trigger(idx
), irq_polarity(idx
));
1589 apic_printk(APIC_VERBOSE
,
1590 " (apicid-pin) not connected\n");
1594 * Set up the timer pin, possibly with the 8259A-master behind.
1596 static void __init
setup_timer_IRQ0_pin(unsigned int apic
, unsigned int pin
,
1599 struct IO_APIC_route_entry entry
;
1601 #ifdef CONFIG_INTR_REMAP
1602 if (intr_remapping_enabled
)
1606 memset(&entry
, 0, sizeof(entry
));
1609 * We use logical delivery to get the timer IRQ
1612 entry
.dest_mode
= INT_DEST_MODE
;
1613 entry
.mask
= 1; /* mask IRQ now */
1614 entry
.dest
= cpu_mask_to_apicid(TARGET_CPUS
);
1615 entry
.delivery_mode
= INT_DELIVERY_MODE
;
1618 entry
.vector
= vector
;
1621 * The timer IRQ doesn't have to know that behind the
1622 * scene we may have a 8259A-master in AEOI mode ...
1624 set_irq_chip_and_handler_name(0, &ioapic_chip
, handle_edge_irq
, "edge");
1627 * Add it to the IO-APIC irq-routing table:
1629 ioapic_write_entry(apic
, pin
, entry
);
1633 __apicdebuginit(void) print_IO_APIC(void)
1636 union IO_APIC_reg_00 reg_00
;
1637 union IO_APIC_reg_01 reg_01
;
1638 union IO_APIC_reg_02 reg_02
;
1639 union IO_APIC_reg_03 reg_03
;
1640 unsigned long flags
;
1641 struct irq_cfg
*cfg
;
1642 struct irq_desc
*desc
;
1645 if (apic_verbosity
== APIC_QUIET
)
1648 printk(KERN_DEBUG
"number of MP IRQ sources: %d.\n", mp_irq_entries
);
1649 for (i
= 0; i
< nr_ioapics
; i
++)
1650 printk(KERN_DEBUG
"number of IO-APIC #%d registers: %d.\n",
1651 mp_ioapics
[i
].mp_apicid
, nr_ioapic_registers
[i
]);
1654 * We are a bit conservative about what we expect. We have to
1655 * know about every hardware change ASAP.
1657 printk(KERN_INFO
"testing the IO APIC.......................\n");
1659 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1661 spin_lock_irqsave(&ioapic_lock
, flags
);
1662 reg_00
.raw
= io_apic_read(apic
, 0);
1663 reg_01
.raw
= io_apic_read(apic
, 1);
1664 if (reg_01
.bits
.version
>= 0x10)
1665 reg_02
.raw
= io_apic_read(apic
, 2);
1666 if (reg_01
.bits
.version
>= 0x20)
1667 reg_03
.raw
= io_apic_read(apic
, 3);
1668 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1671 printk(KERN_DEBUG
"IO APIC #%d......\n", mp_ioapics
[apic
].mp_apicid
);
1672 printk(KERN_DEBUG
".... register #00: %08X\n", reg_00
.raw
);
1673 printk(KERN_DEBUG
"....... : physical APIC id: %02X\n", reg_00
.bits
.ID
);
1674 printk(KERN_DEBUG
"....... : Delivery Type: %X\n", reg_00
.bits
.delivery_type
);
1675 printk(KERN_DEBUG
"....... : LTS : %X\n", reg_00
.bits
.LTS
);
1677 printk(KERN_DEBUG
".... register #01: %08X\n", *(int *)®_01
);
1678 printk(KERN_DEBUG
"....... : max redirection entries: %04X\n", reg_01
.bits
.entries
);
1680 printk(KERN_DEBUG
"....... : PRQ implemented: %X\n", reg_01
.bits
.PRQ
);
1681 printk(KERN_DEBUG
"....... : IO APIC version: %04X\n", reg_01
.bits
.version
);
1684 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1685 * but the value of reg_02 is read as the previous read register
1686 * value, so ignore it if reg_02 == reg_01.
1688 if (reg_01
.bits
.version
>= 0x10 && reg_02
.raw
!= reg_01
.raw
) {
1689 printk(KERN_DEBUG
".... register #02: %08X\n", reg_02
.raw
);
1690 printk(KERN_DEBUG
"....... : arbitration: %02X\n", reg_02
.bits
.arbitration
);
1694 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1695 * or reg_03, but the value of reg_0[23] is read as the previous read
1696 * register value, so ignore it if reg_03 == reg_0[12].
1698 if (reg_01
.bits
.version
>= 0x20 && reg_03
.raw
!= reg_02
.raw
&&
1699 reg_03
.raw
!= reg_01
.raw
) {
1700 printk(KERN_DEBUG
".... register #03: %08X\n", reg_03
.raw
);
1701 printk(KERN_DEBUG
"....... : Boot DT : %X\n", reg_03
.bits
.boot_DT
);
1704 printk(KERN_DEBUG
".... IRQ redirection table:\n");
1706 printk(KERN_DEBUG
" NR Dst Mask Trig IRR Pol"
1707 " Stat Dmod Deli Vect: \n");
1709 for (i
= 0; i
<= reg_01
.bits
.entries
; i
++) {
1710 struct IO_APIC_route_entry entry
;
1712 entry
= ioapic_read_entry(apic
, i
);
1714 printk(KERN_DEBUG
" %02x %03X ",
1719 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1724 entry
.delivery_status
,
1726 entry
.delivery_mode
,
1731 printk(KERN_DEBUG
"IRQ to pin mappings:\n");
1732 for_each_irq_desc(irq
, desc
) {
1733 struct irq_pin_list
*entry
;
1735 cfg
= desc
->chip_data
;
1736 entry
= cfg
->irq_2_pin
;
1739 printk(KERN_DEBUG
"IRQ%d ", irq
);
1741 printk("-> %d:%d", entry
->apic
, entry
->pin
);
1744 entry
= entry
->next
;
1749 printk(KERN_INFO
".................................... done.\n");
1754 __apicdebuginit(void) print_APIC_bitfield(int base
)
1759 if (apic_verbosity
== APIC_QUIET
)
1762 printk(KERN_DEBUG
"0123456789abcdef0123456789abcdef\n" KERN_DEBUG
);
1763 for (i
= 0; i
< 8; i
++) {
1764 v
= apic_read(base
+ i
*0x10);
1765 for (j
= 0; j
< 32; j
++) {
1775 __apicdebuginit(void) print_local_APIC(void *dummy
)
1777 unsigned int v
, ver
, maxlvt
;
1780 if (apic_verbosity
== APIC_QUIET
)
1783 printk("\n" KERN_DEBUG
"printing local APIC contents on CPU#%d/%d:\n",
1784 smp_processor_id(), hard_smp_processor_id());
1785 v
= apic_read(APIC_ID
);
1786 printk(KERN_INFO
"... APIC ID: %08x (%01x)\n", v
, read_apic_id());
1787 v
= apic_read(APIC_LVR
);
1788 printk(KERN_INFO
"... APIC VERSION: %08x\n", v
);
1789 ver
= GET_APIC_VERSION(v
);
1790 maxlvt
= lapic_get_maxlvt();
1792 v
= apic_read(APIC_TASKPRI
);
1793 printk(KERN_DEBUG
"... APIC TASKPRI: %08x (%02x)\n", v
, v
& APIC_TPRI_MASK
);
1795 if (APIC_INTEGRATED(ver
)) { /* !82489DX */
1796 if (!APIC_XAPIC(ver
)) {
1797 v
= apic_read(APIC_ARBPRI
);
1798 printk(KERN_DEBUG
"... APIC ARBPRI: %08x (%02x)\n", v
,
1799 v
& APIC_ARBPRI_MASK
);
1801 v
= apic_read(APIC_PROCPRI
);
1802 printk(KERN_DEBUG
"... APIC PROCPRI: %08x\n", v
);
1806 * Remote read supported only in the 82489DX and local APIC for
1807 * Pentium processors.
1809 if (!APIC_INTEGRATED(ver
) || maxlvt
== 3) {
1810 v
= apic_read(APIC_RRR
);
1811 printk(KERN_DEBUG
"... APIC RRR: %08x\n", v
);
1814 v
= apic_read(APIC_LDR
);
1815 printk(KERN_DEBUG
"... APIC LDR: %08x\n", v
);
1816 if (!x2apic_enabled()) {
1817 v
= apic_read(APIC_DFR
);
1818 printk(KERN_DEBUG
"... APIC DFR: %08x\n", v
);
1820 v
= apic_read(APIC_SPIV
);
1821 printk(KERN_DEBUG
"... APIC SPIV: %08x\n", v
);
1823 printk(KERN_DEBUG
"... APIC ISR field:\n");
1824 print_APIC_bitfield(APIC_ISR
);
1825 printk(KERN_DEBUG
"... APIC TMR field:\n");
1826 print_APIC_bitfield(APIC_TMR
);
1827 printk(KERN_DEBUG
"... APIC IRR field:\n");
1828 print_APIC_bitfield(APIC_IRR
);
1830 if (APIC_INTEGRATED(ver
)) { /* !82489DX */
1831 if (maxlvt
> 3) /* Due to the Pentium erratum 3AP. */
1832 apic_write(APIC_ESR
, 0);
1834 v
= apic_read(APIC_ESR
);
1835 printk(KERN_DEBUG
"... APIC ESR: %08x\n", v
);
1838 icr
= apic_icr_read();
1839 printk(KERN_DEBUG
"... APIC ICR: %08x\n", (u32
)icr
);
1840 printk(KERN_DEBUG
"... APIC ICR2: %08x\n", (u32
)(icr
>> 32));
1842 v
= apic_read(APIC_LVTT
);
1843 printk(KERN_DEBUG
"... APIC LVTT: %08x\n", v
);
1845 if (maxlvt
> 3) { /* PC is LVT#4. */
1846 v
= apic_read(APIC_LVTPC
);
1847 printk(KERN_DEBUG
"... APIC LVTPC: %08x\n", v
);
1849 v
= apic_read(APIC_LVT0
);
1850 printk(KERN_DEBUG
"... APIC LVT0: %08x\n", v
);
1851 v
= apic_read(APIC_LVT1
);
1852 printk(KERN_DEBUG
"... APIC LVT1: %08x\n", v
);
1854 if (maxlvt
> 2) { /* ERR is LVT#3. */
1855 v
= apic_read(APIC_LVTERR
);
1856 printk(KERN_DEBUG
"... APIC LVTERR: %08x\n", v
);
1859 v
= apic_read(APIC_TMICT
);
1860 printk(KERN_DEBUG
"... APIC TMICT: %08x\n", v
);
1861 v
= apic_read(APIC_TMCCT
);
1862 printk(KERN_DEBUG
"... APIC TMCCT: %08x\n", v
);
1863 v
= apic_read(APIC_TDCR
);
1864 printk(KERN_DEBUG
"... APIC TDCR: %08x\n", v
);
1868 __apicdebuginit(void) print_all_local_APICs(void)
1873 for_each_online_cpu(cpu
)
1874 smp_call_function_single(cpu
, print_local_APIC
, NULL
, 1);
1878 __apicdebuginit(void) print_PIC(void)
1881 unsigned long flags
;
1883 if (apic_verbosity
== APIC_QUIET
)
1886 printk(KERN_DEBUG
"\nprinting PIC contents\n");
1888 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 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 __apicdebuginit(int) print_all_ICs(void)
1913 print_all_local_APICs();
1919 fs_initcall(print_all_ICs
);
1922 /* Where if anywhere is the i8259 connect in external int mode */
1923 static struct { int pin
, apic
; } ioapic_i8259
= { -1, -1 };
1925 void __init
enable_IO_APIC(void)
1927 union IO_APIC_reg_01 reg_01
;
1928 int i8259_apic
, i8259_pin
;
1930 unsigned long flags
;
1932 #ifdef CONFIG_X86_32
1935 for (i
= 0; i
< MAX_PIRQS
; i
++)
1936 pirq_entries
[i
] = -1;
1940 * The number of IO-APIC IRQ registers (== #pins):
1942 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1943 spin_lock_irqsave(&ioapic_lock
, flags
);
1944 reg_01
.raw
= io_apic_read(apic
, 1);
1945 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1946 nr_ioapic_registers
[apic
] = reg_01
.bits
.entries
+1;
1948 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
1950 /* See if any of the pins is in ExtINT mode */
1951 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1952 struct IO_APIC_route_entry entry
;
1953 entry
= ioapic_read_entry(apic
, pin
);
1955 /* If the interrupt line is enabled and in ExtInt mode
1956 * I have found the pin where the i8259 is connected.
1958 if ((entry
.mask
== 0) && (entry
.delivery_mode
== dest_ExtINT
)) {
1959 ioapic_i8259
.apic
= apic
;
1960 ioapic_i8259
.pin
= pin
;
1966 /* Look to see what if the MP table has reported the ExtINT */
1967 /* If we could not find the appropriate pin by looking at the ioapic
1968 * the i8259 probably is not connected the ioapic but give the
1969 * mptable a chance anyway.
1971 i8259_pin
= find_isa_irq_pin(0, mp_ExtINT
);
1972 i8259_apic
= find_isa_irq_apic(0, mp_ExtINT
);
1973 /* Trust the MP table if nothing is setup in the hardware */
1974 if ((ioapic_i8259
.pin
== -1) && (i8259_pin
>= 0)) {
1975 printk(KERN_WARNING
"ExtINT not setup in hardware but reported by MP table\n");
1976 ioapic_i8259
.pin
= i8259_pin
;
1977 ioapic_i8259
.apic
= i8259_apic
;
1979 /* Complain if the MP table and the hardware disagree */
1980 if (((ioapic_i8259
.apic
!= i8259_apic
) || (ioapic_i8259
.pin
!= i8259_pin
)) &&
1981 (i8259_pin
>= 0) && (ioapic_i8259
.pin
>= 0))
1983 printk(KERN_WARNING
"ExtINT in hardware and MP table differ\n");
1987 * Do not trust the IO-APIC being empty at bootup
1993 * Not an __init, needed by the reboot code
1995 void disable_IO_APIC(void)
1998 * Clear the IO-APIC before rebooting:
2003 * If the i8259 is routed through an IOAPIC
2004 * Put that IOAPIC in virtual wire mode
2005 * so legacy interrupts can be delivered.
2007 if (ioapic_i8259
.pin
!= -1) {
2008 struct IO_APIC_route_entry entry
;
2010 memset(&entry
, 0, sizeof(entry
));
2011 entry
.mask
= 0; /* Enabled */
2012 entry
.trigger
= 0; /* Edge */
2014 entry
.polarity
= 0; /* High */
2015 entry
.delivery_status
= 0;
2016 entry
.dest_mode
= 0; /* Physical */
2017 entry
.delivery_mode
= dest_ExtINT
; /* ExtInt */
2019 entry
.dest
= read_apic_id();
2022 * Add it to the IO-APIC irq-routing table:
2024 ioapic_write_entry(ioapic_i8259
.apic
, ioapic_i8259
.pin
, entry
);
2027 disconnect_bsp_APIC(ioapic_i8259
.pin
!= -1);
2030 #ifdef CONFIG_X86_32
2032 * function to set the IO-APIC physical IDs based on the
2033 * values stored in the MPC table.
2035 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
2038 static void __init
setup_ioapic_ids_from_mpc(void)
2040 union IO_APIC_reg_00 reg_00
;
2041 physid_mask_t phys_id_present_map
;
2044 unsigned char old_id
;
2045 unsigned long flags
;
2047 if (x86_quirks
->setup_ioapic_ids
&& x86_quirks
->setup_ioapic_ids())
2051 * Don't check I/O APIC IDs for xAPIC systems. They have
2052 * no meaning without the serial APIC bus.
2054 if (!(boot_cpu_data
.x86_vendor
== X86_VENDOR_INTEL
)
2055 || APIC_XAPIC(apic_version
[boot_cpu_physical_apicid
]))
2058 * This is broken; anything with a real cpu count has to
2059 * circumvent this idiocy regardless.
2061 phys_id_present_map
= ioapic_phys_id_map(phys_cpu_present_map
);
2064 * Set the IOAPIC ID to the value stored in the MPC table.
2066 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
2068 /* Read the register 0 value */
2069 spin_lock_irqsave(&ioapic_lock
, flags
);
2070 reg_00
.raw
= io_apic_read(apic
, 0);
2071 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2073 old_id
= mp_ioapics
[apic
].mp_apicid
;
2075 if (mp_ioapics
[apic
].mp_apicid
>= get_physical_broadcast()) {
2076 printk(KERN_ERR
"BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
2077 apic
, mp_ioapics
[apic
].mp_apicid
);
2078 printk(KERN_ERR
"... fixing up to %d. (tell your hw vendor)\n",
2080 mp_ioapics
[apic
].mp_apicid
= reg_00
.bits
.ID
;
2084 * Sanity check, is the ID really free? Every APIC in a
2085 * system must have a unique ID or we get lots of nice
2086 * 'stuck on smp_invalidate_needed IPI wait' messages.
2088 if (check_apicid_used(phys_id_present_map
,
2089 mp_ioapics
[apic
].mp_apicid
)) {
2090 printk(KERN_ERR
"BIOS bug, IO-APIC#%d ID %d is already used!...\n",
2091 apic
, mp_ioapics
[apic
].mp_apicid
);
2092 for (i
= 0; i
< get_physical_broadcast(); i
++)
2093 if (!physid_isset(i
, phys_id_present_map
))
2095 if (i
>= get_physical_broadcast())
2096 panic("Max APIC ID exceeded!\n");
2097 printk(KERN_ERR
"... fixing up to %d. (tell your hw vendor)\n",
2099 physid_set(i
, phys_id_present_map
);
2100 mp_ioapics
[apic
].mp_apicid
= i
;
2103 tmp
= apicid_to_cpu_present(mp_ioapics
[apic
].mp_apicid
);
2104 apic_printk(APIC_VERBOSE
, "Setting %d in the "
2105 "phys_id_present_map\n",
2106 mp_ioapics
[apic
].mp_apicid
);
2107 physids_or(phys_id_present_map
, phys_id_present_map
, tmp
);
2112 * We need to adjust the IRQ routing table
2113 * if the ID changed.
2115 if (old_id
!= mp_ioapics
[apic
].mp_apicid
)
2116 for (i
= 0; i
< mp_irq_entries
; i
++)
2117 if (mp_irqs
[i
].mp_dstapic
== old_id
)
2118 mp_irqs
[i
].mp_dstapic
2119 = mp_ioapics
[apic
].mp_apicid
;
2122 * Read the right value from the MPC table and
2123 * write it into the ID register.
2125 apic_printk(APIC_VERBOSE
, KERN_INFO
2126 "...changing IO-APIC physical APIC ID to %d ...",
2127 mp_ioapics
[apic
].mp_apicid
);
2129 reg_00
.bits
.ID
= mp_ioapics
[apic
].mp_apicid
;
2130 spin_lock_irqsave(&ioapic_lock
, flags
);
2131 io_apic_write(apic
, 0, reg_00
.raw
);
2132 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2137 spin_lock_irqsave(&ioapic_lock
, flags
);
2138 reg_00
.raw
= io_apic_read(apic
, 0);
2139 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2140 if (reg_00
.bits
.ID
!= mp_ioapics
[apic
].mp_apicid
)
2141 printk("could not set ID!\n");
2143 apic_printk(APIC_VERBOSE
, " ok.\n");
2148 int no_timer_check __initdata
;
2150 static int __init
notimercheck(char *s
)
2155 __setup("no_timer_check", notimercheck
);
2158 * There is a nasty bug in some older SMP boards, their mptable lies
2159 * about the timer IRQ. We do the following to work around the situation:
2161 * - timer IRQ defaults to IO-APIC IRQ
2162 * - if this function detects that timer IRQs are defunct, then we fall
2163 * back to ISA timer IRQs
2165 static int __init
timer_irq_works(void)
2167 unsigned long t1
= jiffies
;
2168 unsigned long flags
;
2173 local_save_flags(flags
);
2175 /* Let ten ticks pass... */
2176 mdelay((10 * 1000) / HZ
);
2177 local_irq_restore(flags
);
2180 * Expect a few ticks at least, to be sure some possible
2181 * glue logic does not lock up after one or two first
2182 * ticks in a non-ExtINT mode. Also the local APIC
2183 * might have cached one ExtINT interrupt. Finally, at
2184 * least one tick may be lost due to delays.
2188 if (time_after(jiffies
, t1
+ 4))
2194 * In the SMP+IOAPIC case it might happen that there are an unspecified
2195 * number of pending IRQ events unhandled. These cases are very rare,
2196 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
2197 * better to do it this way as thus we do not have to be aware of
2198 * 'pending' interrupts in the IRQ path, except at this point.
2201 * Edge triggered needs to resend any interrupt
2202 * that was delayed but this is now handled in the device
2207 * Starting up a edge-triggered IO-APIC interrupt is
2208 * nasty - we need to make sure that we get the edge.
2209 * If it is already asserted for some reason, we need
2210 * return 1 to indicate that is was pending.
2212 * This is not complete - we should be able to fake
2213 * an edge even if it isn't on the 8259A...
2216 static unsigned int startup_ioapic_irq(unsigned int irq
)
2218 int was_pending
= 0;
2219 unsigned long flags
;
2220 struct irq_cfg
*cfg
;
2222 spin_lock_irqsave(&ioapic_lock
, flags
);
2223 if (irq
< NR_IRQS_LEGACY
) {
2224 disable_8259A_irq(irq
);
2225 if (i8259A_irq_pending(irq
))
2229 __unmask_IO_APIC_irq(cfg
);
2230 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2235 #ifdef CONFIG_X86_64
2236 static int ioapic_retrigger_irq(unsigned int irq
)
2239 struct irq_cfg
*cfg
= irq_cfg(irq
);
2240 unsigned long flags
;
2242 spin_lock_irqsave(&vector_lock
, flags
);
2243 send_IPI_mask(cpumask_of_cpu(first_cpu(cfg
->domain
)), cfg
->vector
);
2244 spin_unlock_irqrestore(&vector_lock
, flags
);
2249 static int ioapic_retrigger_irq(unsigned int irq
)
2251 send_IPI_self(irq_cfg(irq
)->vector
);
2258 * Level and edge triggered IO-APIC interrupts need different handling,
2259 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
2260 * handled with the level-triggered descriptor, but that one has slightly
2261 * more overhead. Level-triggered interrupts cannot be handled with the
2262 * edge-triggered handler, without risking IRQ storms and other ugly
2268 #ifdef CONFIG_INTR_REMAP
2269 static void ir_irq_migration(struct work_struct
*work
);
2271 static DECLARE_DELAYED_WORK(ir_migration_work
, ir_irq_migration
);
2274 * Migrate the IO-APIC irq in the presence of intr-remapping.
2276 * For edge triggered, irq migration is a simple atomic update(of vector
2277 * and cpu destination) of IRTE and flush the hardware cache.
2279 * For level triggered, we need to modify the io-apic RTE aswell with the update
2280 * vector information, along with modifying IRTE with vector and destination.
2281 * So irq migration for level triggered is little bit more complex compared to
2282 * edge triggered migration. But the good news is, we use the same algorithm
2283 * for level triggered migration as we have today, only difference being,
2284 * we now initiate the irq migration from process context instead of the
2285 * interrupt context.
2287 * In future, when we do a directed EOI (combined with cpu EOI broadcast
2288 * suppression) to the IO-APIC, level triggered irq migration will also be
2289 * as simple as edge triggered migration and we can do the irq migration
2290 * with a simple atomic update to IO-APIC RTE.
2292 static void migrate_ioapic_irq_desc(struct irq_desc
*desc
, cpumask_t mask
)
2294 struct irq_cfg
*cfg
;
2295 cpumask_t tmp
, cleanup_mask
;
2297 int modify_ioapic_rte
;
2299 unsigned long flags
;
2302 cpus_and(tmp
, mask
, cpu_online_map
);
2303 if (cpus_empty(tmp
))
2307 if (get_irte(irq
, &irte
))
2310 cfg
= desc
->chip_data
;
2311 if (assign_irq_vector(irq
, cfg
, mask
))
2314 set_extra_move_desc(desc
, mask
);
2316 cpus_and(tmp
, cfg
->domain
, mask
);
2317 dest
= cpu_mask_to_apicid(tmp
);
2319 modify_ioapic_rte
= desc
->status
& IRQ_LEVEL
;
2320 if (modify_ioapic_rte
) {
2321 spin_lock_irqsave(&ioapic_lock
, flags
);
2322 __target_IO_APIC_irq(irq
, dest
, cfg
);
2323 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2326 irte
.vector
= cfg
->vector
;
2327 irte
.dest_id
= IRTE_DEST(dest
);
2330 * Modified the IRTE and flushes the Interrupt entry cache.
2332 modify_irte(irq
, &irte
);
2334 if (cfg
->move_in_progress
) {
2335 cpus_and(cleanup_mask
, cfg
->old_domain
, cpu_online_map
);
2336 cfg
->move_cleanup_count
= cpus_weight(cleanup_mask
);
2337 send_IPI_mask(cleanup_mask
, IRQ_MOVE_CLEANUP_VECTOR
);
2338 cfg
->move_in_progress
= 0;
2341 desc
->affinity
= mask
;
2344 static int migrate_irq_remapped_level_desc(struct irq_desc
*desc
)
2347 struct irq_cfg
*cfg
= desc
->chip_data
;
2349 mask_IO_APIC_irq_desc(desc
);
2351 if (io_apic_level_ack_pending(cfg
)) {
2353 * Interrupt in progress. Migrating irq now will change the
2354 * vector information in the IO-APIC RTE and that will confuse
2355 * the EOI broadcast performed by cpu.
2356 * So, delay the irq migration to the next instance.
2358 schedule_delayed_work(&ir_migration_work
, 1);
2362 /* everthing is clear. we have right of way */
2363 migrate_ioapic_irq_desc(desc
, desc
->pending_mask
);
2366 desc
->status
&= ~IRQ_MOVE_PENDING
;
2367 cpus_clear(desc
->pending_mask
);
2370 unmask_IO_APIC_irq_desc(desc
);
2375 static void ir_irq_migration(struct work_struct
*work
)
2378 struct irq_desc
*desc
;
2380 for_each_irq_desc(irq
, desc
) {
2381 if (desc
->status
& IRQ_MOVE_PENDING
) {
2382 unsigned long flags
;
2384 spin_lock_irqsave(&desc
->lock
, flags
);
2385 if (!desc
->chip
->set_affinity
||
2386 !(desc
->status
& IRQ_MOVE_PENDING
)) {
2387 desc
->status
&= ~IRQ_MOVE_PENDING
;
2388 spin_unlock_irqrestore(&desc
->lock
, flags
);
2392 desc
->chip
->set_affinity(irq
, desc
->pending_mask
);
2393 spin_unlock_irqrestore(&desc
->lock
, flags
);
2399 * Migrates the IRQ destination in the process context.
2401 static void set_ir_ioapic_affinity_irq_desc(struct irq_desc
*desc
, cpumask_t mask
)
2403 if (desc
->status
& IRQ_LEVEL
) {
2404 desc
->status
|= IRQ_MOVE_PENDING
;
2405 desc
->pending_mask
= mask
;
2406 migrate_irq_remapped_level_desc(desc
);
2410 migrate_ioapic_irq_desc(desc
, mask
);
2412 static void set_ir_ioapic_affinity_irq(unsigned int irq
, cpumask_t mask
)
2414 struct irq_desc
*desc
= irq_to_desc(irq
);
2416 set_ir_ioapic_affinity_irq_desc(desc
, mask
);
2420 asmlinkage
void smp_irq_move_cleanup_interrupt(void)
2422 unsigned vector
, me
;
2428 me
= smp_processor_id();
2429 for (vector
= FIRST_EXTERNAL_VECTOR
; vector
< NR_VECTORS
; vector
++) {
2431 struct irq_desc
*desc
;
2432 struct irq_cfg
*cfg
;
2433 irq
= __get_cpu_var(vector_irq
)[vector
];
2438 desc
= irq_to_desc(irq
);
2443 spin_lock(&desc
->lock
);
2444 if (!cfg
->move_cleanup_count
)
2447 if ((vector
== cfg
->vector
) && cpu_isset(me
, cfg
->domain
))
2450 __get_cpu_var(vector_irq
)[vector
] = -1;
2451 cfg
->move_cleanup_count
--;
2453 spin_unlock(&desc
->lock
);
2459 static void irq_complete_move(struct irq_desc
**descp
)
2461 struct irq_desc
*desc
= *descp
;
2462 struct irq_cfg
*cfg
= desc
->chip_data
;
2463 unsigned vector
, me
;
2465 if (likely(!cfg
->move_in_progress
)) {
2466 #ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
2467 if (likely(!cfg
->move_desc_pending
))
2470 /* domain has not changed, but affinity did */
2471 me
= smp_processor_id();
2472 if (cpu_isset(me
, desc
->affinity
)) {
2473 *descp
= desc
= move_irq_desc(desc
, me
);
2474 /* get the new one */
2475 cfg
= desc
->chip_data
;
2476 cfg
->move_desc_pending
= 0;
2482 vector
= ~get_irq_regs()->orig_ax
;
2483 me
= smp_processor_id();
2484 if ((vector
== cfg
->vector
) && cpu_isset(me
, cfg
->domain
)) {
2485 cpumask_t cleanup_mask
;
2487 #ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
2488 *descp
= desc
= move_irq_desc(desc
, me
);
2489 /* get the new one */
2490 cfg
= desc
->chip_data
;
2493 cpus_and(cleanup_mask
, cfg
->old_domain
, cpu_online_map
);
2494 cfg
->move_cleanup_count
= cpus_weight(cleanup_mask
);
2495 send_IPI_mask(cleanup_mask
, IRQ_MOVE_CLEANUP_VECTOR
);
2496 cfg
->move_in_progress
= 0;
2500 static inline void irq_complete_move(struct irq_desc
**descp
) {}
2503 #ifdef CONFIG_INTR_REMAP
2504 static void ack_x2apic_level(unsigned int irq
)
2509 static void ack_x2apic_edge(unsigned int irq
)
2516 static void ack_apic_edge(unsigned int irq
)
2518 struct irq_desc
*desc
= irq_to_desc(irq
);
2520 irq_complete_move(&desc
);
2521 move_native_irq(irq
);
2525 atomic_t irq_mis_count
;
2527 static void ack_apic_level(unsigned int irq
)
2529 struct irq_desc
*desc
= irq_to_desc(irq
);
2531 #ifdef CONFIG_X86_32
2535 struct irq_cfg
*cfg
;
2536 int do_unmask_irq
= 0;
2538 irq_complete_move(&desc
);
2539 #ifdef CONFIG_GENERIC_PENDING_IRQ
2540 /* If we are moving the irq we need to mask it */
2541 if (unlikely(desc
->status
& IRQ_MOVE_PENDING
)) {
2543 mask_IO_APIC_irq_desc(desc
);
2547 #ifdef CONFIG_X86_32
2549 * It appears there is an erratum which affects at least version 0x11
2550 * of I/O APIC (that's the 82093AA and cores integrated into various
2551 * chipsets). Under certain conditions a level-triggered interrupt is
2552 * erroneously delivered as edge-triggered one but the respective IRR
2553 * bit gets set nevertheless. As a result the I/O unit expects an EOI
2554 * message but it will never arrive and further interrupts are blocked
2555 * from the source. The exact reason is so far unknown, but the
2556 * phenomenon was observed when two consecutive interrupt requests
2557 * from a given source get delivered to the same CPU and the source is
2558 * temporarily disabled in between.
2560 * A workaround is to simulate an EOI message manually. We achieve it
2561 * by setting the trigger mode to edge and then to level when the edge
2562 * trigger mode gets detected in the TMR of a local APIC for a
2563 * level-triggered interrupt. We mask the source for the time of the
2564 * operation to prevent an edge-triggered interrupt escaping meanwhile.
2565 * The idea is from Manfred Spraul. --macro
2567 cfg
= desc
->chip_data
;
2570 v
= apic_read(APIC_TMR
+ ((i
& ~0x1f) >> 1));
2574 * We must acknowledge the irq before we move it or the acknowledge will
2575 * not propagate properly.
2579 /* Now we can move and renable the irq */
2580 if (unlikely(do_unmask_irq
)) {
2581 /* Only migrate the irq if the ack has been received.
2583 * On rare occasions the broadcast level triggered ack gets
2584 * delayed going to ioapics, and if we reprogram the
2585 * vector while Remote IRR is still set the irq will never
2588 * To prevent this scenario we read the Remote IRR bit
2589 * of the ioapic. This has two effects.
2590 * - On any sane system the read of the ioapic will
2591 * flush writes (and acks) going to the ioapic from
2593 * - We get to see if the ACK has actually been delivered.
2595 * Based on failed experiments of reprogramming the
2596 * ioapic entry from outside of irq context starting
2597 * with masking the ioapic entry and then polling until
2598 * Remote IRR was clear before reprogramming the
2599 * ioapic I don't trust the Remote IRR bit to be
2600 * completey accurate.
2602 * However there appears to be no other way to plug
2603 * this race, so if the Remote IRR bit is not
2604 * accurate and is causing problems then it is a hardware bug
2605 * and you can go talk to the chipset vendor about it.
2607 cfg
= desc
->chip_data
;
2608 if (!io_apic_level_ack_pending(cfg
))
2609 move_masked_irq(irq
);
2610 unmask_IO_APIC_irq_desc(desc
);
2613 #ifdef CONFIG_X86_32
2614 if (!(v
& (1 << (i
& 0x1f)))) {
2615 atomic_inc(&irq_mis_count
);
2616 spin_lock(&ioapic_lock
);
2617 __mask_and_edge_IO_APIC_irq(cfg
);
2618 __unmask_and_level_IO_APIC_irq(cfg
);
2619 spin_unlock(&ioapic_lock
);
2624 static struct irq_chip ioapic_chip __read_mostly
= {
2626 .startup
= startup_ioapic_irq
,
2627 .mask
= mask_IO_APIC_irq
,
2628 .unmask
= unmask_IO_APIC_irq
,
2629 .ack
= ack_apic_edge
,
2630 .eoi
= ack_apic_level
,
2632 .set_affinity
= set_ioapic_affinity_irq
,
2634 .retrigger
= ioapic_retrigger_irq
,
2637 #ifdef CONFIG_INTR_REMAP
2638 static struct irq_chip ir_ioapic_chip __read_mostly
= {
2639 .name
= "IR-IO-APIC",
2640 .startup
= startup_ioapic_irq
,
2641 .mask
= mask_IO_APIC_irq
,
2642 .unmask
= unmask_IO_APIC_irq
,
2643 .ack
= ack_x2apic_edge
,
2644 .eoi
= ack_x2apic_level
,
2646 .set_affinity
= set_ir_ioapic_affinity_irq
,
2648 .retrigger
= ioapic_retrigger_irq
,
2652 static inline void init_IO_APIC_traps(void)
2655 struct irq_desc
*desc
;
2656 struct irq_cfg
*cfg
;
2659 * NOTE! The local APIC isn't very good at handling
2660 * multiple interrupts at the same interrupt level.
2661 * As the interrupt level is determined by taking the
2662 * vector number and shifting that right by 4, we
2663 * want to spread these out a bit so that they don't
2664 * all fall in the same interrupt level.
2666 * Also, we've got to be careful not to trash gate
2667 * 0x80, because int 0x80 is hm, kind of importantish. ;)
2669 for_each_irq_desc(irq
, desc
) {
2670 cfg
= desc
->chip_data
;
2671 if (IO_APIC_IRQ(irq
) && cfg
&& !cfg
->vector
) {
2673 * Hmm.. We don't have an entry for this,
2674 * so default to an old-fashioned 8259
2675 * interrupt if we can..
2677 if (irq
< NR_IRQS_LEGACY
)
2678 make_8259A_irq(irq
);
2680 /* Strange. Oh, well.. */
2681 desc
->chip
= &no_irq_chip
;
2687 * The local APIC irq-chip implementation:
2690 static void mask_lapic_irq(unsigned int irq
)
2694 v
= apic_read(APIC_LVT0
);
2695 apic_write(APIC_LVT0
, v
| APIC_LVT_MASKED
);
2698 static void unmask_lapic_irq(unsigned int irq
)
2702 v
= apic_read(APIC_LVT0
);
2703 apic_write(APIC_LVT0
, v
& ~APIC_LVT_MASKED
);
2706 static void ack_lapic_irq(unsigned int irq
)
2711 static struct irq_chip lapic_chip __read_mostly
= {
2712 .name
= "local-APIC",
2713 .mask
= mask_lapic_irq
,
2714 .unmask
= unmask_lapic_irq
,
2715 .ack
= ack_lapic_irq
,
2718 static void lapic_register_intr(int irq
, struct irq_desc
*desc
)
2720 desc
->status
&= ~IRQ_LEVEL
;
2721 set_irq_chip_and_handler_name(irq
, &lapic_chip
, handle_edge_irq
,
2725 static void __init
setup_nmi(void)
2728 * Dirty trick to enable the NMI watchdog ...
2729 * We put the 8259A master into AEOI mode and
2730 * unmask on all local APICs LVT0 as NMI.
2732 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2733 * is from Maciej W. Rozycki - so we do not have to EOI from
2734 * the NMI handler or the timer interrupt.
2736 apic_printk(APIC_VERBOSE
, KERN_INFO
"activating NMI Watchdog ...");
2738 enable_NMI_through_LVT0();
2740 apic_printk(APIC_VERBOSE
, " done.\n");
2744 * This looks a bit hackish but it's about the only one way of sending
2745 * a few INTA cycles to 8259As and any associated glue logic. ICR does
2746 * not support the ExtINT mode, unfortunately. We need to send these
2747 * cycles as some i82489DX-based boards have glue logic that keeps the
2748 * 8259A interrupt line asserted until INTA. --macro
2750 static inline void __init
unlock_ExtINT_logic(void)
2753 struct IO_APIC_route_entry entry0
, entry1
;
2754 unsigned char save_control
, save_freq_select
;
2756 pin
= find_isa_irq_pin(8, mp_INT
);
2761 apic
= find_isa_irq_apic(8, mp_INT
);
2767 entry0
= ioapic_read_entry(apic
, pin
);
2768 clear_IO_APIC_pin(apic
, pin
);
2770 memset(&entry1
, 0, sizeof(entry1
));
2772 entry1
.dest_mode
= 0; /* physical delivery */
2773 entry1
.mask
= 0; /* unmask IRQ now */
2774 entry1
.dest
= hard_smp_processor_id();
2775 entry1
.delivery_mode
= dest_ExtINT
;
2776 entry1
.polarity
= entry0
.polarity
;
2780 ioapic_write_entry(apic
, pin
, entry1
);
2782 save_control
= CMOS_READ(RTC_CONTROL
);
2783 save_freq_select
= CMOS_READ(RTC_FREQ_SELECT
);
2784 CMOS_WRITE((save_freq_select
& ~RTC_RATE_SELECT
) | 0x6,
2786 CMOS_WRITE(save_control
| RTC_PIE
, RTC_CONTROL
);
2791 if ((CMOS_READ(RTC_INTR_FLAGS
) & RTC_PF
) == RTC_PF
)
2795 CMOS_WRITE(save_control
, RTC_CONTROL
);
2796 CMOS_WRITE(save_freq_select
, RTC_FREQ_SELECT
);
2797 clear_IO_APIC_pin(apic
, pin
);
2799 ioapic_write_entry(apic
, pin
, entry0
);
2802 static int disable_timer_pin_1 __initdata
;
2803 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2804 static int __init
disable_timer_pin_setup(char *arg
)
2806 disable_timer_pin_1
= 1;
2809 early_param("disable_timer_pin_1", disable_timer_pin_setup
);
2811 int timer_through_8259 __initdata
;
2814 * This code may look a bit paranoid, but it's supposed to cooperate with
2815 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2816 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2817 * fanatically on his truly buggy board.
2819 * FIXME: really need to revamp this for all platforms.
2821 static inline void __init
check_timer(void)
2823 struct irq_desc
*desc
= irq_to_desc(0);
2824 struct irq_cfg
*cfg
= desc
->chip_data
;
2825 int cpu
= boot_cpu_id
;
2826 int apic1
, pin1
, apic2
, pin2
;
2827 unsigned long flags
;
2831 local_irq_save(flags
);
2833 ver
= apic_read(APIC_LVR
);
2834 ver
= GET_APIC_VERSION(ver
);
2837 * get/set the timer IRQ vector:
2839 disable_8259A_irq(0);
2840 assign_irq_vector(0, cfg
, TARGET_CPUS
);
2843 * As IRQ0 is to be enabled in the 8259A, the virtual
2844 * wire has to be disabled in the local APIC. Also
2845 * timer interrupts need to be acknowledged manually in
2846 * the 8259A for the i82489DX when using the NMI
2847 * watchdog as that APIC treats NMIs as level-triggered.
2848 * The AEOI mode will finish them in the 8259A
2851 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_EXTINT
);
2853 #ifdef CONFIG_X86_32
2854 timer_ack
= (nmi_watchdog
== NMI_IO_APIC
&& !APIC_INTEGRATED(ver
));
2857 pin1
= find_isa_irq_pin(0, mp_INT
);
2858 apic1
= find_isa_irq_apic(0, mp_INT
);
2859 pin2
= ioapic_i8259
.pin
;
2860 apic2
= ioapic_i8259
.apic
;
2862 apic_printk(APIC_QUIET
, KERN_INFO
"..TIMER: vector=0x%02X "
2863 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2864 cfg
->vector
, apic1
, pin1
, apic2
, pin2
);
2867 * Some BIOS writers are clueless and report the ExtINTA
2868 * I/O APIC input from the cascaded 8259A as the timer
2869 * interrupt input. So just in case, if only one pin
2870 * was found above, try it both directly and through the
2874 #ifdef CONFIG_INTR_REMAP
2875 if (intr_remapping_enabled
)
2876 panic("BIOS bug: timer not connected to IO-APIC");
2881 } else if (pin2
== -1) {
2888 * Ok, does IRQ0 through the IOAPIC work?
2891 add_pin_to_irq_cpu(cfg
, cpu
, apic1
, pin1
);
2892 setup_timer_IRQ0_pin(apic1
, pin1
, cfg
->vector
);
2894 unmask_IO_APIC_irq_desc(desc
);
2895 if (timer_irq_works()) {
2896 if (nmi_watchdog
== NMI_IO_APIC
) {
2898 enable_8259A_irq(0);
2900 if (disable_timer_pin_1
> 0)
2901 clear_IO_APIC_pin(0, pin1
);
2904 #ifdef CONFIG_INTR_REMAP
2905 if (intr_remapping_enabled
)
2906 panic("timer doesn't work through Interrupt-remapped IO-APIC");
2908 clear_IO_APIC_pin(apic1
, pin1
);
2910 apic_printk(APIC_QUIET
, KERN_ERR
"..MP-BIOS bug: "
2911 "8254 timer not connected to IO-APIC\n");
2913 apic_printk(APIC_QUIET
, KERN_INFO
"...trying to set up timer "
2914 "(IRQ0) through the 8259A ...\n");
2915 apic_printk(APIC_QUIET
, KERN_INFO
2916 "..... (found apic %d pin %d) ...\n", apic2
, pin2
);
2918 * legacy devices should be connected to IO APIC #0
2920 replace_pin_at_irq_cpu(cfg
, cpu
, apic1
, pin1
, apic2
, pin2
);
2921 setup_timer_IRQ0_pin(apic2
, pin2
, cfg
->vector
);
2922 unmask_IO_APIC_irq_desc(desc
);
2923 enable_8259A_irq(0);
2924 if (timer_irq_works()) {
2925 apic_printk(APIC_QUIET
, KERN_INFO
"....... works.\n");
2926 timer_through_8259
= 1;
2927 if (nmi_watchdog
== NMI_IO_APIC
) {
2928 disable_8259A_irq(0);
2930 enable_8259A_irq(0);
2935 * Cleanup, just in case ...
2937 disable_8259A_irq(0);
2938 clear_IO_APIC_pin(apic2
, pin2
);
2939 apic_printk(APIC_QUIET
, KERN_INFO
"....... failed.\n");
2942 if (nmi_watchdog
== NMI_IO_APIC
) {
2943 apic_printk(APIC_QUIET
, KERN_WARNING
"timer doesn't work "
2944 "through the IO-APIC - disabling NMI Watchdog!\n");
2945 nmi_watchdog
= NMI_NONE
;
2947 #ifdef CONFIG_X86_32
2951 apic_printk(APIC_QUIET
, KERN_INFO
2952 "...trying to set up timer as Virtual Wire IRQ...\n");
2954 lapic_register_intr(0, desc
);
2955 apic_write(APIC_LVT0
, APIC_DM_FIXED
| cfg
->vector
); /* Fixed mode */
2956 enable_8259A_irq(0);
2958 if (timer_irq_works()) {
2959 apic_printk(APIC_QUIET
, KERN_INFO
"..... works.\n");
2962 disable_8259A_irq(0);
2963 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_FIXED
| cfg
->vector
);
2964 apic_printk(APIC_QUIET
, KERN_INFO
"..... failed.\n");
2966 apic_printk(APIC_QUIET
, KERN_INFO
2967 "...trying to set up timer as ExtINT IRQ...\n");
2971 apic_write(APIC_LVT0
, APIC_DM_EXTINT
);
2973 unlock_ExtINT_logic();
2975 if (timer_irq_works()) {
2976 apic_printk(APIC_QUIET
, KERN_INFO
"..... works.\n");
2979 apic_printk(APIC_QUIET
, KERN_INFO
"..... failed :(.\n");
2980 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
2981 "report. Then try booting with the 'noapic' option.\n");
2983 local_irq_restore(flags
);
2987 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
2988 * to devices. However there may be an I/O APIC pin available for
2989 * this interrupt regardless. The pin may be left unconnected, but
2990 * typically it will be reused as an ExtINT cascade interrupt for
2991 * the master 8259A. In the MPS case such a pin will normally be
2992 * reported as an ExtINT interrupt in the MP table. With ACPI
2993 * there is no provision for ExtINT interrupts, and in the absence
2994 * of an override it would be treated as an ordinary ISA I/O APIC
2995 * interrupt, that is edge-triggered and unmasked by default. We
2996 * used to do this, but it caused problems on some systems because
2997 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
2998 * the same ExtINT cascade interrupt to drive the local APIC of the
2999 * bootstrap processor. Therefore we refrain from routing IRQ2 to
3000 * the I/O APIC in all cases now. No actual device should request
3001 * it anyway. --macro
3003 #define PIC_IRQS (1 << PIC_CASCADE_IR)
3005 void __init
setup_IO_APIC(void)
3008 #ifdef CONFIG_X86_32
3012 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
3016 io_apic_irqs
= ~PIC_IRQS
;
3018 apic_printk(APIC_VERBOSE
, "ENABLING IO-APIC IRQs\n");
3020 * Set up IO-APIC IRQ routing.
3022 #ifdef CONFIG_X86_32
3024 setup_ioapic_ids_from_mpc();
3027 setup_IO_APIC_irqs();
3028 init_IO_APIC_traps();
3033 * Called after all the initialization is done. If we didnt find any
3034 * APIC bugs then we can allow the modify fast path
3037 static int __init
io_apic_bug_finalize(void)
3039 if (sis_apic_bug
== -1)
3044 late_initcall(io_apic_bug_finalize
);
3046 struct sysfs_ioapic_data
{
3047 struct sys_device dev
;
3048 struct IO_APIC_route_entry entry
[0];
3050 static struct sysfs_ioapic_data
* mp_ioapic_data
[MAX_IO_APICS
];
3052 static int ioapic_suspend(struct sys_device
*dev
, pm_message_t state
)
3054 struct IO_APIC_route_entry
*entry
;
3055 struct sysfs_ioapic_data
*data
;
3058 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
3059 entry
= data
->entry
;
3060 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++, entry
++ )
3061 *entry
= ioapic_read_entry(dev
->id
, i
);
3066 static int ioapic_resume(struct sys_device
*dev
)
3068 struct IO_APIC_route_entry
*entry
;
3069 struct sysfs_ioapic_data
*data
;
3070 unsigned long flags
;
3071 union IO_APIC_reg_00 reg_00
;
3074 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
3075 entry
= data
->entry
;
3077 spin_lock_irqsave(&ioapic_lock
, flags
);
3078 reg_00
.raw
= io_apic_read(dev
->id
, 0);
3079 if (reg_00
.bits
.ID
!= mp_ioapics
[dev
->id
].mp_apicid
) {
3080 reg_00
.bits
.ID
= mp_ioapics
[dev
->id
].mp_apicid
;
3081 io_apic_write(dev
->id
, 0, reg_00
.raw
);
3083 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3084 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++)
3085 ioapic_write_entry(dev
->id
, i
, entry
[i
]);
3090 static struct sysdev_class ioapic_sysdev_class
= {
3092 .suspend
= ioapic_suspend
,
3093 .resume
= ioapic_resume
,
3096 static int __init
ioapic_init_sysfs(void)
3098 struct sys_device
* dev
;
3101 error
= sysdev_class_register(&ioapic_sysdev_class
);
3105 for (i
= 0; i
< nr_ioapics
; i
++ ) {
3106 size
= sizeof(struct sys_device
) + nr_ioapic_registers
[i
]
3107 * sizeof(struct IO_APIC_route_entry
);
3108 mp_ioapic_data
[i
] = kzalloc(size
, GFP_KERNEL
);
3109 if (!mp_ioapic_data
[i
]) {
3110 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
3113 dev
= &mp_ioapic_data
[i
]->dev
;
3115 dev
->cls
= &ioapic_sysdev_class
;
3116 error
= sysdev_register(dev
);
3118 kfree(mp_ioapic_data
[i
]);
3119 mp_ioapic_data
[i
] = NULL
;
3120 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
3128 device_initcall(ioapic_init_sysfs
);
3131 * Dynamic irq allocate and deallocation
3133 unsigned int create_irq_nr(unsigned int irq_want
)
3135 /* Allocate an unused irq */
3138 unsigned long flags
;
3139 struct irq_cfg
*cfg_new
= NULL
;
3140 int cpu
= boot_cpu_id
;
3141 struct irq_desc
*desc_new
= NULL
;
3144 spin_lock_irqsave(&vector_lock
, flags
);
3145 for (new = irq_want
; new < NR_IRQS
; new++) {
3146 if (platform_legacy_irq(new))
3149 desc_new
= irq_to_desc_alloc_cpu(new, cpu
);
3151 printk(KERN_INFO
"can not get irq_desc for %d\n", new);
3154 cfg_new
= desc_new
->chip_data
;
3156 if (cfg_new
->vector
!= 0)
3158 if (__assign_irq_vector(new, cfg_new
, TARGET_CPUS
) == 0)
3162 spin_unlock_irqrestore(&vector_lock
, flags
);
3165 dynamic_irq_init(irq
);
3166 /* restore it, in case dynamic_irq_init clear it */
3168 desc_new
->chip_data
= cfg_new
;
3173 static int nr_irqs_gsi
= NR_IRQS_LEGACY
;
3174 int create_irq(void)
3176 unsigned int irq_want
;
3179 irq_want
= nr_irqs_gsi
;
3180 irq
= create_irq_nr(irq_want
);
3188 void destroy_irq(unsigned int irq
)
3190 unsigned long flags
;
3191 struct irq_cfg
*cfg
;
3192 struct irq_desc
*desc
;
3194 /* store it, in case dynamic_irq_cleanup clear it */
3195 desc
= irq_to_desc(irq
);
3196 cfg
= desc
->chip_data
;
3197 dynamic_irq_cleanup(irq
);
3198 /* connect back irq_cfg */
3200 desc
->chip_data
= cfg
;
3202 #ifdef CONFIG_INTR_REMAP
3205 spin_lock_irqsave(&vector_lock
, flags
);
3206 __clear_irq_vector(irq
, cfg
);
3207 spin_unlock_irqrestore(&vector_lock
, flags
);
3211 * MSI message composition
3213 #ifdef CONFIG_PCI_MSI
3214 static int msi_compose_msg(struct pci_dev
*pdev
, unsigned int irq
, struct msi_msg
*msg
)
3216 struct irq_cfg
*cfg
;
3223 err
= assign_irq_vector(irq
, cfg
, tmp
);
3227 cpus_and(tmp
, cfg
->domain
, tmp
);
3228 dest
= cpu_mask_to_apicid(tmp
);
3230 #ifdef CONFIG_INTR_REMAP
3231 if (irq_remapped(irq
)) {
3236 ir_index
= map_irq_to_irte_handle(irq
, &sub_handle
);
3237 BUG_ON(ir_index
== -1);
3239 memset (&irte
, 0, sizeof(irte
));
3242 irte
.dst_mode
= INT_DEST_MODE
;
3243 irte
.trigger_mode
= 0; /* edge */
3244 irte
.dlvry_mode
= INT_DELIVERY_MODE
;
3245 irte
.vector
= cfg
->vector
;
3246 irte
.dest_id
= IRTE_DEST(dest
);
3248 modify_irte(irq
, &irte
);
3250 msg
->address_hi
= MSI_ADDR_BASE_HI
;
3251 msg
->data
= sub_handle
;
3252 msg
->address_lo
= MSI_ADDR_BASE_LO
| MSI_ADDR_IR_EXT_INT
|
3254 MSI_ADDR_IR_INDEX1(ir_index
) |
3255 MSI_ADDR_IR_INDEX2(ir_index
);
3259 msg
->address_hi
= MSI_ADDR_BASE_HI
;
3262 ((INT_DEST_MODE
== 0) ?
3263 MSI_ADDR_DEST_MODE_PHYSICAL
:
3264 MSI_ADDR_DEST_MODE_LOGICAL
) |
3265 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
3266 MSI_ADDR_REDIRECTION_CPU
:
3267 MSI_ADDR_REDIRECTION_LOWPRI
) |
3268 MSI_ADDR_DEST_ID(dest
);
3271 MSI_DATA_TRIGGER_EDGE
|
3272 MSI_DATA_LEVEL_ASSERT
|
3273 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
3274 MSI_DATA_DELIVERY_FIXED
:
3275 MSI_DATA_DELIVERY_LOWPRI
) |
3276 MSI_DATA_VECTOR(cfg
->vector
);
3282 static void set_msi_irq_affinity(unsigned int irq
, cpumask_t mask
)
3284 struct irq_desc
*desc
= irq_to_desc(irq
);
3285 struct irq_cfg
*cfg
;
3290 cpus_and(tmp
, mask
, cpu_online_map
);
3291 if (cpus_empty(tmp
))
3294 cfg
= desc
->chip_data
;
3295 if (assign_irq_vector(irq
, cfg
, mask
))
3298 set_extra_move_desc(desc
, mask
);
3300 cpus_and(tmp
, cfg
->domain
, mask
);
3301 dest
= cpu_mask_to_apicid(tmp
);
3303 read_msi_msg_desc(desc
, &msg
);
3305 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
3306 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
3307 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
3308 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
3310 write_msi_msg_desc(desc
, &msg
);
3311 desc
->affinity
= mask
;
3313 #ifdef CONFIG_INTR_REMAP
3315 * Migrate the MSI irq to another cpumask. This migration is
3316 * done in the process context using interrupt-remapping hardware.
3318 static void ir_set_msi_irq_affinity(unsigned int irq
, cpumask_t mask
)
3320 struct irq_desc
*desc
= irq_to_desc(irq
);
3321 struct irq_cfg
*cfg
;
3323 cpumask_t tmp
, cleanup_mask
;
3326 cpus_and(tmp
, mask
, cpu_online_map
);
3327 if (cpus_empty(tmp
))
3330 if (get_irte(irq
, &irte
))
3333 cfg
= desc
->chip_data
;
3334 if (assign_irq_vector(irq
, cfg
, mask
))
3337 set_extra_move_desc(desc
, mask
);
3339 cpus_and(tmp
, cfg
->domain
, mask
);
3340 dest
= cpu_mask_to_apicid(tmp
);
3342 irte
.vector
= cfg
->vector
;
3343 irte
.dest_id
= IRTE_DEST(dest
);
3346 * atomically update the IRTE with the new destination and vector.
3348 modify_irte(irq
, &irte
);
3351 * After this point, all the interrupts will start arriving
3352 * at the new destination. So, time to cleanup the previous
3353 * vector allocation.
3355 if (cfg
->move_in_progress
) {
3356 cpus_and(cleanup_mask
, cfg
->old_domain
, cpu_online_map
);
3357 cfg
->move_cleanup_count
= cpus_weight(cleanup_mask
);
3358 send_IPI_mask(cleanup_mask
, IRQ_MOVE_CLEANUP_VECTOR
);
3359 cfg
->move_in_progress
= 0;
3362 desc
->affinity
= mask
;
3366 #endif /* CONFIG_SMP */
3369 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
3370 * which implement the MSI or MSI-X Capability Structure.
3372 static struct irq_chip msi_chip
= {
3374 .unmask
= unmask_msi_irq
,
3375 .mask
= mask_msi_irq
,
3376 .ack
= ack_apic_edge
,
3378 .set_affinity
= set_msi_irq_affinity
,
3380 .retrigger
= ioapic_retrigger_irq
,
3383 #ifdef CONFIG_INTR_REMAP
3384 static struct irq_chip msi_ir_chip
= {
3385 .name
= "IR-PCI-MSI",
3386 .unmask
= unmask_msi_irq
,
3387 .mask
= mask_msi_irq
,
3388 .ack
= ack_x2apic_edge
,
3390 .set_affinity
= ir_set_msi_irq_affinity
,
3392 .retrigger
= ioapic_retrigger_irq
,
3396 * Map the PCI dev to the corresponding remapping hardware unit
3397 * and allocate 'nvec' consecutive interrupt-remapping table entries
3400 static int msi_alloc_irte(struct pci_dev
*dev
, int irq
, int nvec
)
3402 struct intel_iommu
*iommu
;
3405 iommu
= map_dev_to_ir(dev
);
3408 "Unable to map PCI %s to iommu\n", pci_name(dev
));
3412 index
= alloc_irte(iommu
, irq
, nvec
);
3415 "Unable to allocate %d IRTE for PCI %s\n", nvec
,
3423 static int setup_msi_irq(struct pci_dev
*dev
, struct msi_desc
*msidesc
, int irq
)
3428 ret
= msi_compose_msg(dev
, irq
, &msg
);
3432 set_irq_msi(irq
, msidesc
);
3433 write_msi_msg(irq
, &msg
);
3435 #ifdef CONFIG_INTR_REMAP
3436 if (irq_remapped(irq
)) {
3437 struct irq_desc
*desc
= irq_to_desc(irq
);
3439 * irq migration in process context
3441 desc
->status
|= IRQ_MOVE_PCNTXT
;
3442 set_irq_chip_and_handler_name(irq
, &msi_ir_chip
, handle_edge_irq
, "edge");
3445 set_irq_chip_and_handler_name(irq
, &msi_chip
, handle_edge_irq
, "edge");
3447 dev_printk(KERN_DEBUG
, &dev
->dev
, "irq %d for MSI/MSI-X\n", irq
);
3452 int arch_setup_msi_irq(struct pci_dev
*dev
, struct msi_desc
*msidesc
)
3456 unsigned int irq_want
;
3458 irq_want
= nr_irqs_gsi
;
3459 irq
= create_irq_nr(irq_want
);
3463 #ifdef CONFIG_INTR_REMAP
3464 if (!intr_remapping_enabled
)
3467 ret
= msi_alloc_irte(dev
, irq
, 1);
3472 ret
= setup_msi_irq(dev
, msidesc
, irq
);
3479 #ifdef CONFIG_INTR_REMAP
3486 int arch_setup_msi_irqs(struct pci_dev
*dev
, int nvec
, int type
)
3489 int ret
, sub_handle
;
3490 struct msi_desc
*msidesc
;
3491 unsigned int irq_want
;
3493 #ifdef CONFIG_INTR_REMAP
3494 struct intel_iommu
*iommu
= 0;
3498 irq_want
= nr_irqs_gsi
;
3500 list_for_each_entry(msidesc
, &dev
->msi_list
, list
) {
3501 irq
= create_irq_nr(irq_want
);
3505 #ifdef CONFIG_INTR_REMAP
3506 if (!intr_remapping_enabled
)
3511 * allocate the consecutive block of IRTE's
3514 index
= msi_alloc_irte(dev
, irq
, nvec
);
3520 iommu
= map_dev_to_ir(dev
);
3526 * setup the mapping between the irq and the IRTE
3527 * base index, the sub_handle pointing to the
3528 * appropriate interrupt remap table entry.
3530 set_irte_irq(irq
, iommu
, index
, sub_handle
);
3534 ret
= setup_msi_irq(dev
, msidesc
, irq
);
3546 void arch_teardown_msi_irq(unsigned int irq
)
3553 static void dmar_msi_set_affinity(unsigned int irq
, cpumask_t mask
)
3555 struct irq_desc
*desc
= irq_to_desc(irq
);
3556 struct irq_cfg
*cfg
;
3561 cpus_and(tmp
, mask
, cpu_online_map
);
3562 if (cpus_empty(tmp
))
3565 cfg
= desc
->chip_data
;
3566 if (assign_irq_vector(irq
, cfg
, mask
))
3569 set_extra_move_desc(desc
, mask
);
3571 cpus_and(tmp
, cfg
->domain
, mask
);
3572 dest
= cpu_mask_to_apicid(tmp
);
3574 dmar_msi_read(irq
, &msg
);
3576 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
3577 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
3578 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
3579 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
3581 dmar_msi_write(irq
, &msg
);
3582 desc
->affinity
= mask
;
3585 #endif /* CONFIG_SMP */
3587 struct irq_chip dmar_msi_type
= {
3589 .unmask
= dmar_msi_unmask
,
3590 .mask
= dmar_msi_mask
,
3591 .ack
= ack_apic_edge
,
3593 .set_affinity
= dmar_msi_set_affinity
,
3595 .retrigger
= ioapic_retrigger_irq
,
3598 int arch_setup_dmar_msi(unsigned int irq
)
3603 ret
= msi_compose_msg(NULL
, irq
, &msg
);
3606 dmar_msi_write(irq
, &msg
);
3607 set_irq_chip_and_handler_name(irq
, &dmar_msi_type
, handle_edge_irq
,
3613 #ifdef CONFIG_HPET_TIMER
3616 static void hpet_msi_set_affinity(unsigned int irq
, cpumask_t mask
)
3618 struct irq_desc
*desc
= irq_to_desc(irq
);
3619 struct irq_cfg
*cfg
;
3624 cpus_and(tmp
, mask
, cpu_online_map
);
3625 if (cpus_empty(tmp
))
3628 cfg
= desc
->chip_data
;
3629 if (assign_irq_vector(irq
, cfg
, mask
))
3632 set_extra_move_desc(desc
, mask
);
3634 cpus_and(tmp
, cfg
->domain
, mask
);
3635 dest
= cpu_mask_to_apicid(tmp
);
3637 hpet_msi_read(irq
, &msg
);
3639 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
3640 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
3641 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
3642 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
3644 hpet_msi_write(irq
, &msg
);
3645 desc
->affinity
= mask
;
3648 #endif /* CONFIG_SMP */
3650 struct irq_chip hpet_msi_type
= {
3652 .unmask
= hpet_msi_unmask
,
3653 .mask
= hpet_msi_mask
,
3654 .ack
= ack_apic_edge
,
3656 .set_affinity
= hpet_msi_set_affinity
,
3658 .retrigger
= ioapic_retrigger_irq
,
3661 int arch_setup_hpet_msi(unsigned int irq
)
3666 ret
= msi_compose_msg(NULL
, irq
, &msg
);
3670 hpet_msi_write(irq
, &msg
);
3671 set_irq_chip_and_handler_name(irq
, &hpet_msi_type
, handle_edge_irq
,
3678 #endif /* CONFIG_PCI_MSI */
3680 * Hypertransport interrupt support
3682 #ifdef CONFIG_HT_IRQ
3686 static void target_ht_irq(unsigned int irq
, unsigned int dest
, u8 vector
)
3688 struct ht_irq_msg msg
;
3689 fetch_ht_irq_msg(irq
, &msg
);
3691 msg
.address_lo
&= ~(HT_IRQ_LOW_VECTOR_MASK
| HT_IRQ_LOW_DEST_ID_MASK
);
3692 msg
.address_hi
&= ~(HT_IRQ_HIGH_DEST_ID_MASK
);
3694 msg
.address_lo
|= HT_IRQ_LOW_VECTOR(vector
) | HT_IRQ_LOW_DEST_ID(dest
);
3695 msg
.address_hi
|= HT_IRQ_HIGH_DEST_ID(dest
);
3697 write_ht_irq_msg(irq
, &msg
);
3700 static void set_ht_irq_affinity(unsigned int irq
, cpumask_t mask
)
3702 struct irq_desc
*desc
= irq_to_desc(irq
);
3703 struct irq_cfg
*cfg
;
3707 cpus_and(tmp
, mask
, cpu_online_map
);
3708 if (cpus_empty(tmp
))
3711 cfg
= desc
->chip_data
;
3712 if (assign_irq_vector(irq
, cfg
, mask
))
3715 set_extra_move_desc(desc
, mask
);
3717 cpus_and(tmp
, cfg
->domain
, mask
);
3718 dest
= cpu_mask_to_apicid(tmp
);
3720 target_ht_irq(irq
, dest
, cfg
->vector
);
3721 desc
->affinity
= mask
;
3726 static struct irq_chip ht_irq_chip
= {
3728 .mask
= mask_ht_irq
,
3729 .unmask
= unmask_ht_irq
,
3730 .ack
= ack_apic_edge
,
3732 .set_affinity
= set_ht_irq_affinity
,
3734 .retrigger
= ioapic_retrigger_irq
,
3737 int arch_setup_ht_irq(unsigned int irq
, struct pci_dev
*dev
)
3739 struct irq_cfg
*cfg
;
3745 err
= assign_irq_vector(irq
, cfg
, tmp
);
3747 struct ht_irq_msg msg
;
3750 cpus_and(tmp
, cfg
->domain
, tmp
);
3751 dest
= cpu_mask_to_apicid(tmp
);
3753 msg
.address_hi
= HT_IRQ_HIGH_DEST_ID(dest
);
3757 HT_IRQ_LOW_DEST_ID(dest
) |
3758 HT_IRQ_LOW_VECTOR(cfg
->vector
) |
3759 ((INT_DEST_MODE
== 0) ?
3760 HT_IRQ_LOW_DM_PHYSICAL
:
3761 HT_IRQ_LOW_DM_LOGICAL
) |
3762 HT_IRQ_LOW_RQEOI_EDGE
|
3763 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
3764 HT_IRQ_LOW_MT_FIXED
:
3765 HT_IRQ_LOW_MT_ARBITRATED
) |
3766 HT_IRQ_LOW_IRQ_MASKED
;
3768 write_ht_irq_msg(irq
, &msg
);
3770 set_irq_chip_and_handler_name(irq
, &ht_irq_chip
,
3771 handle_edge_irq
, "edge");
3773 dev_printk(KERN_DEBUG
, &dev
->dev
, "irq %d for HT\n", irq
);
3777 #endif /* CONFIG_HT_IRQ */
3779 #ifdef CONFIG_X86_64
3781 * Re-target the irq to the specified CPU and enable the specified MMR located
3782 * on the specified blade to allow the sending of MSIs to the specified CPU.
3784 int arch_enable_uv_irq(char *irq_name
, unsigned int irq
, int cpu
, int mmr_blade
,
3785 unsigned long mmr_offset
)
3787 const cpumask_t
*eligible_cpu
= get_cpu_mask(cpu
);
3788 struct irq_cfg
*cfg
;
3790 unsigned long mmr_value
;
3791 struct uv_IO_APIC_route_entry
*entry
;
3792 unsigned long flags
;
3797 err
= assign_irq_vector(irq
, cfg
, *eligible_cpu
);
3801 spin_lock_irqsave(&vector_lock
, flags
);
3802 set_irq_chip_and_handler_name(irq
, &uv_irq_chip
, handle_percpu_irq
,
3804 spin_unlock_irqrestore(&vector_lock
, flags
);
3807 entry
= (struct uv_IO_APIC_route_entry
*)&mmr_value
;
3808 BUG_ON(sizeof(struct uv_IO_APIC_route_entry
) != sizeof(unsigned long));
3810 entry
->vector
= cfg
->vector
;
3811 entry
->delivery_mode
= INT_DELIVERY_MODE
;
3812 entry
->dest_mode
= INT_DEST_MODE
;
3813 entry
->polarity
= 0;
3816 entry
->dest
= cpu_mask_to_apicid(*eligible_cpu
);
3818 mmr_pnode
= uv_blade_to_pnode(mmr_blade
);
3819 uv_write_global_mmr64(mmr_pnode
, mmr_offset
, mmr_value
);
3825 * Disable the specified MMR located on the specified blade so that MSIs are
3826 * longer allowed to be sent.
3828 void arch_disable_uv_irq(int mmr_blade
, unsigned long mmr_offset
)
3830 unsigned long mmr_value
;
3831 struct uv_IO_APIC_route_entry
*entry
;
3835 entry
= (struct uv_IO_APIC_route_entry
*)&mmr_value
;
3836 BUG_ON(sizeof(struct uv_IO_APIC_route_entry
) != sizeof(unsigned long));
3840 mmr_pnode
= uv_blade_to_pnode(mmr_blade
);
3841 uv_write_global_mmr64(mmr_pnode
, mmr_offset
, mmr_value
);
3843 #endif /* CONFIG_X86_64 */
3845 int __init
io_apic_get_redir_entries (int ioapic
)
3847 union IO_APIC_reg_01 reg_01
;
3848 unsigned long flags
;
3850 spin_lock_irqsave(&ioapic_lock
, flags
);
3851 reg_01
.raw
= io_apic_read(ioapic
, 1);
3852 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3854 return reg_01
.bits
.entries
;
3857 void __init
probe_nr_irqs_gsi(void)
3862 for (idx
= 0; idx
< nr_ioapics
; idx
++)
3863 nr
+= io_apic_get_redir_entries(idx
) + 1;
3865 if (nr
> nr_irqs_gsi
)
3869 /* --------------------------------------------------------------------------
3870 ACPI-based IOAPIC Configuration
3871 -------------------------------------------------------------------------- */
3875 #ifdef CONFIG_X86_32
3876 int __init
io_apic_get_unique_id(int ioapic
, int apic_id
)
3878 union IO_APIC_reg_00 reg_00
;
3879 static physid_mask_t apic_id_map
= PHYSID_MASK_NONE
;
3881 unsigned long flags
;
3885 * The P4 platform supports up to 256 APIC IDs on two separate APIC
3886 * buses (one for LAPICs, one for IOAPICs), where predecessors only
3887 * supports up to 16 on one shared APIC bus.
3889 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
3890 * advantage of new APIC bus architecture.
3893 if (physids_empty(apic_id_map
))
3894 apic_id_map
= ioapic_phys_id_map(phys_cpu_present_map
);
3896 spin_lock_irqsave(&ioapic_lock
, flags
);
3897 reg_00
.raw
= io_apic_read(ioapic
, 0);
3898 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3900 if (apic_id
>= get_physical_broadcast()) {
3901 printk(KERN_WARNING
"IOAPIC[%d]: Invalid apic_id %d, trying "
3902 "%d\n", ioapic
, apic_id
, reg_00
.bits
.ID
);
3903 apic_id
= reg_00
.bits
.ID
;
3907 * Every APIC in a system must have a unique ID or we get lots of nice
3908 * 'stuck on smp_invalidate_needed IPI wait' messages.
3910 if (check_apicid_used(apic_id_map
, apic_id
)) {
3912 for (i
= 0; i
< get_physical_broadcast(); i
++) {
3913 if (!check_apicid_used(apic_id_map
, i
))
3917 if (i
== get_physical_broadcast())
3918 panic("Max apic_id exceeded!\n");
3920 printk(KERN_WARNING
"IOAPIC[%d]: apic_id %d already used, "
3921 "trying %d\n", ioapic
, apic_id
, i
);
3926 tmp
= apicid_to_cpu_present(apic_id
);
3927 physids_or(apic_id_map
, apic_id_map
, tmp
);
3929 if (reg_00
.bits
.ID
!= apic_id
) {
3930 reg_00
.bits
.ID
= apic_id
;
3932 spin_lock_irqsave(&ioapic_lock
, flags
);
3933 io_apic_write(ioapic
, 0, reg_00
.raw
);
3934 reg_00
.raw
= io_apic_read(ioapic
, 0);
3935 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3938 if (reg_00
.bits
.ID
!= apic_id
) {
3939 printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic
);
3944 apic_printk(APIC_VERBOSE
, KERN_INFO
3945 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic
, apic_id
);
3950 int __init
io_apic_get_version(int ioapic
)
3952 union IO_APIC_reg_01 reg_01
;
3953 unsigned long flags
;
3955 spin_lock_irqsave(&ioapic_lock
, flags
);
3956 reg_01
.raw
= io_apic_read(ioapic
, 1);
3957 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3959 return reg_01
.bits
.version
;
3963 int io_apic_set_pci_routing (int ioapic
, int pin
, int irq
, int triggering
, int polarity
)
3965 struct irq_desc
*desc
;
3966 struct irq_cfg
*cfg
;
3967 int cpu
= boot_cpu_id
;
3969 if (!IO_APIC_IRQ(irq
)) {
3970 apic_printk(APIC_QUIET
,KERN_ERR
"IOAPIC[%d]: Invalid reference to IRQ 0\n",
3975 desc
= irq_to_desc_alloc_cpu(irq
, cpu
);
3977 printk(KERN_INFO
"can not get irq_desc %d\n", irq
);
3982 * IRQs < 16 are already in the irq_2_pin[] map
3984 if (irq
>= NR_IRQS_LEGACY
) {
3985 cfg
= desc
->chip_data
;
3986 add_pin_to_irq_cpu(cfg
, cpu
, ioapic
, pin
);
3989 setup_IO_APIC_irq(ioapic
, pin
, irq
, desc
, triggering
, polarity
);
3995 int acpi_get_override_irq(int bus_irq
, int *trigger
, int *polarity
)
3999 if (skip_ioapic_setup
)
4002 for (i
= 0; i
< mp_irq_entries
; i
++)
4003 if (mp_irqs
[i
].mp_irqtype
== mp_INT
&&
4004 mp_irqs
[i
].mp_srcbusirq
== bus_irq
)
4006 if (i
>= mp_irq_entries
)
4009 *trigger
= irq_trigger(i
);
4010 *polarity
= irq_polarity(i
);
4014 #endif /* CONFIG_ACPI */
4017 * This function currently is only a helper for the i386 smp boot process where
4018 * we need to reprogram the ioredtbls to cater for the cpus which have come online
4019 * so mask in all cases should simply be TARGET_CPUS
4022 void __init
setup_ioapic_dest(void)
4024 int pin
, ioapic
, irq
, irq_entry
;
4025 struct irq_desc
*desc
;
4026 struct irq_cfg
*cfg
;
4029 if (skip_ioapic_setup
== 1)
4032 for (ioapic
= 0; ioapic
< nr_ioapics
; ioapic
++) {
4033 for (pin
= 0; pin
< nr_ioapic_registers
[ioapic
]; pin
++) {
4034 irq_entry
= find_irq_entry(ioapic
, pin
, mp_INT
);
4035 if (irq_entry
== -1)
4037 irq
= pin_2_irq(irq_entry
, ioapic
, pin
);
4039 /* setup_IO_APIC_irqs could fail to get vector for some device
4040 * when you have too many devices, because at that time only boot
4043 desc
= irq_to_desc(irq
);
4044 cfg
= desc
->chip_data
;
4046 setup_IO_APIC_irq(ioapic
, pin
, irq
, desc
,
4047 irq_trigger(irq_entry
),
4048 irq_polarity(irq_entry
));
4054 * Honour affinities which have been set in early boot
4057 (IRQ_NO_BALANCING
| IRQ_AFFINITY_SET
))
4058 mask
= desc
->affinity
;
4062 #ifdef CONFIG_INTR_REMAP
4063 if (intr_remapping_enabled
)
4064 set_ir_ioapic_affinity_irq_desc(desc
, mask
);
4067 set_ioapic_affinity_irq_desc(desc
, mask
);
4074 #define IOAPIC_RESOURCE_NAME_SIZE 11
4076 static struct resource
*ioapic_resources
;
4078 static struct resource
* __init
ioapic_setup_resources(void)
4081 struct resource
*res
;
4085 if (nr_ioapics
<= 0)
4088 n
= IOAPIC_RESOURCE_NAME_SIZE
+ sizeof(struct resource
);
4091 mem
= alloc_bootmem(n
);
4095 mem
+= sizeof(struct resource
) * nr_ioapics
;
4097 for (i
= 0; i
< nr_ioapics
; i
++) {
4099 res
[i
].flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
4100 sprintf(mem
, "IOAPIC %u", i
);
4101 mem
+= IOAPIC_RESOURCE_NAME_SIZE
;
4105 ioapic_resources
= res
;
4110 void __init
ioapic_init_mappings(void)
4112 unsigned long ioapic_phys
, idx
= FIX_IO_APIC_BASE_0
;
4113 struct resource
*ioapic_res
;
4116 ioapic_res
= ioapic_setup_resources();
4117 for (i
= 0; i
< nr_ioapics
; i
++) {
4118 if (smp_found_config
) {
4119 ioapic_phys
= mp_ioapics
[i
].mp_apicaddr
;
4120 #ifdef CONFIG_X86_32
4123 "WARNING: bogus zero IO-APIC "
4124 "address found in MPTABLE, "
4125 "disabling IO/APIC support!\n");
4126 smp_found_config
= 0;
4127 skip_ioapic_setup
= 1;
4128 goto fake_ioapic_page
;
4132 #ifdef CONFIG_X86_32
4135 ioapic_phys
= (unsigned long)
4136 alloc_bootmem_pages(PAGE_SIZE
);
4137 ioapic_phys
= __pa(ioapic_phys
);
4139 set_fixmap_nocache(idx
, ioapic_phys
);
4140 apic_printk(APIC_VERBOSE
,
4141 "mapped IOAPIC to %08lx (%08lx)\n",
4142 __fix_to_virt(idx
), ioapic_phys
);
4145 if (ioapic_res
!= NULL
) {
4146 ioapic_res
->start
= ioapic_phys
;
4147 ioapic_res
->end
= ioapic_phys
+ (4 * 1024) - 1;
4153 static int __init
ioapic_insert_resources(void)
4156 struct resource
*r
= ioapic_resources
;
4160 "IO APIC resources could be not be allocated.\n");
4164 for (i
= 0; i
< nr_ioapics
; i
++) {
4165 insert_resource(&iomem_resource
, r
);
4172 /* Insert the IO APIC resources after PCI initialization has occured to handle
4173 * IO APICS that are mapped in on a BAR in PCI space. */
4174 late_initcall(ioapic_insert_resources
);