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>
51 #include <asm/proto.h>
54 #include <asm/timer.h>
55 #include <asm/i8259.h>
57 #include <asm/msidef.h>
58 #include <asm/hypertransport.h>
59 #include <asm/setup.h>
60 #include <asm/irq_remapping.h>
62 #include <asm/uv/uv_hub.h>
63 #include <asm/uv/uv_irq.h>
66 #include <mach_apic.h>
67 #include <mach_apicdef.h>
69 #define __apicdebuginit(type) static type __init
72 * Is the SiS APIC rmw bug present ?
73 * -1 = don't know, 0 = no, 1 = yes
75 int sis_apic_bug
= -1;
77 static DEFINE_SPINLOCK(ioapic_lock
);
78 static DEFINE_SPINLOCK(vector_lock
);
81 * # of IRQ routing registers
83 int nr_ioapic_registers
[MAX_IO_APICS
];
85 /* I/O APIC entries */
86 struct mpc_ioapic mp_ioapics
[MAX_IO_APICS
];
89 /* MP IRQ source entries */
90 struct mpc_intsrc mp_irqs
[MAX_IRQ_SOURCES
];
92 /* # of MP IRQ source entries */
95 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
96 int mp_bus_id_to_type
[MAX_MP_BUSSES
];
99 DECLARE_BITMAP(mp_bus_not_pci
, MAX_MP_BUSSES
);
101 int skip_ioapic_setup
;
103 static int __init
parse_noapic(char *str
)
105 /* disable IO-APIC */
106 disable_ioapic_setup();
109 early_param("noapic", parse_noapic
);
114 * This is performance-critical, we want to do it O(1)
116 * the indexing order of this array favors 1:1 mappings
117 * between pins and IRQs.
120 struct irq_pin_list
{
122 struct irq_pin_list
*next
;
125 static struct irq_pin_list
*get_one_free_irq_2_pin(int cpu
)
127 struct irq_pin_list
*pin
;
130 node
= cpu_to_node(cpu
);
132 pin
= kzalloc_node(sizeof(*pin
), GFP_ATOMIC
, node
);
138 struct irq_pin_list
*irq_2_pin
;
139 cpumask_var_t domain
;
140 cpumask_var_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] = { .vector
= IRQ0_VECTOR
, },
156 [1] = { .vector
= IRQ1_VECTOR
, },
157 [2] = { .vector
= IRQ2_VECTOR
, },
158 [3] = { .vector
= IRQ3_VECTOR
, },
159 [4] = { .vector
= IRQ4_VECTOR
, },
160 [5] = { .vector
= IRQ5_VECTOR
, },
161 [6] = { .vector
= IRQ6_VECTOR
, },
162 [7] = { .vector
= IRQ7_VECTOR
, },
163 [8] = { .vector
= IRQ8_VECTOR
, },
164 [9] = { .vector
= IRQ9_VECTOR
, },
165 [10] = { .vector
= IRQ10_VECTOR
, },
166 [11] = { .vector
= IRQ11_VECTOR
, },
167 [12] = { .vector
= IRQ12_VECTOR
, },
168 [13] = { .vector
= IRQ13_VECTOR
, },
169 [14] = { .vector
= IRQ14_VECTOR
, },
170 [15] = { .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
];
186 alloc_bootmem_cpumask_var(&cfg
[i
].domain
);
187 alloc_bootmem_cpumask_var(&cfg
[i
].old_domain
);
188 if (i
< NR_IRQS_LEGACY
)
189 cpumask_setall(cfg
[i
].domain
);
195 #ifdef CONFIG_SPARSE_IRQ
196 static struct irq_cfg
*irq_cfg(unsigned int irq
)
198 struct irq_cfg
*cfg
= NULL
;
199 struct irq_desc
*desc
;
201 desc
= irq_to_desc(irq
);
203 cfg
= desc
->chip_data
;
208 static struct irq_cfg
*get_one_free_irq_cfg(int cpu
)
213 node
= cpu_to_node(cpu
);
215 cfg
= kzalloc_node(sizeof(*cfg
), GFP_ATOMIC
, node
);
217 if (!alloc_cpumask_var_node(&cfg
->domain
, GFP_ATOMIC
, node
)) {
220 } else if (!alloc_cpumask_var_node(&cfg
->old_domain
,
222 free_cpumask_var(cfg
->domain
);
226 cpumask_clear(cfg
->domain
);
227 cpumask_clear(cfg
->old_domain
);
234 int arch_init_chip_data(struct irq_desc
*desc
, int cpu
)
238 cfg
= desc
->chip_data
;
240 desc
->chip_data
= get_one_free_irq_cfg(cpu
);
241 if (!desc
->chip_data
) {
242 printk(KERN_ERR
"can not alloc irq_cfg\n");
250 #ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
253 init_copy_irq_2_pin(struct irq_cfg
*old_cfg
, struct irq_cfg
*cfg
, int cpu
)
255 struct irq_pin_list
*old_entry
, *head
, *tail
, *entry
;
257 cfg
->irq_2_pin
= NULL
;
258 old_entry
= old_cfg
->irq_2_pin
;
262 entry
= get_one_free_irq_2_pin(cpu
);
266 entry
->apic
= old_entry
->apic
;
267 entry
->pin
= old_entry
->pin
;
270 old_entry
= old_entry
->next
;
272 entry
= get_one_free_irq_2_pin(cpu
);
280 /* still use the old one */
283 entry
->apic
= old_entry
->apic
;
284 entry
->pin
= old_entry
->pin
;
287 old_entry
= old_entry
->next
;
291 cfg
->irq_2_pin
= head
;
294 static void free_irq_2_pin(struct irq_cfg
*old_cfg
, struct irq_cfg
*cfg
)
296 struct irq_pin_list
*entry
, *next
;
298 if (old_cfg
->irq_2_pin
== cfg
->irq_2_pin
)
301 entry
= old_cfg
->irq_2_pin
;
308 old_cfg
->irq_2_pin
= NULL
;
311 void arch_init_copy_chip_data(struct irq_desc
*old_desc
,
312 struct irq_desc
*desc
, int cpu
)
315 struct irq_cfg
*old_cfg
;
317 cfg
= get_one_free_irq_cfg(cpu
);
322 desc
->chip_data
= cfg
;
324 old_cfg
= old_desc
->chip_data
;
326 memcpy(cfg
, old_cfg
, sizeof(struct irq_cfg
));
328 init_copy_irq_2_pin(old_cfg
, cfg
, cpu
);
331 static void free_irq_cfg(struct irq_cfg
*old_cfg
)
336 void arch_free_chip_data(struct irq_desc
*old_desc
, struct irq_desc
*desc
)
338 struct irq_cfg
*old_cfg
, *cfg
;
340 old_cfg
= old_desc
->chip_data
;
341 cfg
= desc
->chip_data
;
347 free_irq_2_pin(old_cfg
, cfg
);
348 free_irq_cfg(old_cfg
);
349 old_desc
->chip_data
= NULL
;
354 set_extra_move_desc(struct irq_desc
*desc
, const struct cpumask
*mask
)
356 struct irq_cfg
*cfg
= desc
->chip_data
;
358 if (!cfg
->move_in_progress
) {
359 /* it means that domain is not changed */
360 if (!cpumask_intersects(desc
->affinity
, mask
))
361 cfg
->move_desc_pending
= 1;
367 static struct irq_cfg
*irq_cfg(unsigned int irq
)
369 return irq
< nr_irqs
? irq_cfgx
+ irq
: NULL
;
374 #ifndef CONFIG_NUMA_MIGRATE_IRQ_DESC
376 set_extra_move_desc(struct irq_desc
*desc
, const struct cpumask
*mask
)
383 unsigned int unused
[3];
387 static __attribute_const__
struct io_apic __iomem
*io_apic_base(int idx
)
389 return (void __iomem
*) __fix_to_virt(FIX_IO_APIC_BASE_0
+ idx
)
390 + (mp_ioapics
[idx
].apicaddr
& ~PAGE_MASK
);
393 static inline unsigned int io_apic_read(unsigned int apic
, unsigned int reg
)
395 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
396 writel(reg
, &io_apic
->index
);
397 return readl(&io_apic
->data
);
400 static inline void io_apic_write(unsigned int apic
, unsigned int reg
, unsigned int value
)
402 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
403 writel(reg
, &io_apic
->index
);
404 writel(value
, &io_apic
->data
);
408 * Re-write a value: to be used for read-modify-write
409 * cycles where the read already set up the index register.
411 * Older SiS APIC requires we rewrite the index register
413 static inline void io_apic_modify(unsigned int apic
, unsigned int reg
, unsigned int value
)
415 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
418 writel(reg
, &io_apic
->index
);
419 writel(value
, &io_apic
->data
);
422 static bool io_apic_level_ack_pending(struct irq_cfg
*cfg
)
424 struct irq_pin_list
*entry
;
427 spin_lock_irqsave(&ioapic_lock
, flags
);
428 entry
= cfg
->irq_2_pin
;
436 reg
= io_apic_read(entry
->apic
, 0x10 + pin
*2);
437 /* Is the remote IRR bit set? */
438 if (reg
& IO_APIC_REDIR_REMOTE_IRR
) {
439 spin_unlock_irqrestore(&ioapic_lock
, flags
);
446 spin_unlock_irqrestore(&ioapic_lock
, flags
);
452 struct { u32 w1
, w2
; };
453 struct IO_APIC_route_entry entry
;
456 static struct IO_APIC_route_entry
ioapic_read_entry(int apic
, int pin
)
458 union entry_union eu
;
460 spin_lock_irqsave(&ioapic_lock
, flags
);
461 eu
.w1
= io_apic_read(apic
, 0x10 + 2 * pin
);
462 eu
.w2
= io_apic_read(apic
, 0x11 + 2 * pin
);
463 spin_unlock_irqrestore(&ioapic_lock
, flags
);
468 * When we write a new IO APIC routing entry, we need to write the high
469 * word first! If the mask bit in the low word is clear, we will enable
470 * the interrupt, and we need to make sure the entry is fully populated
471 * before that happens.
474 __ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
476 union entry_union eu
;
478 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
479 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
482 static void ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
485 spin_lock_irqsave(&ioapic_lock
, flags
);
486 __ioapic_write_entry(apic
, pin
, e
);
487 spin_unlock_irqrestore(&ioapic_lock
, flags
);
491 * When we mask an IO APIC routing entry, we need to write the low
492 * word first, in order to set the mask bit before we change the
495 static void ioapic_mask_entry(int apic
, int pin
)
498 union entry_union eu
= { .entry
.mask
= 1 };
500 spin_lock_irqsave(&ioapic_lock
, flags
);
501 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
502 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
503 spin_unlock_irqrestore(&ioapic_lock
, flags
);
507 static void send_cleanup_vector(struct irq_cfg
*cfg
)
509 cpumask_var_t cleanup_mask
;
511 if (unlikely(!alloc_cpumask_var(&cleanup_mask
, GFP_ATOMIC
))) {
513 cfg
->move_cleanup_count
= 0;
514 for_each_cpu_and(i
, cfg
->old_domain
, cpu_online_mask
)
515 cfg
->move_cleanup_count
++;
516 for_each_cpu_and(i
, cfg
->old_domain
, cpu_online_mask
)
517 send_IPI_mask(cpumask_of(i
), IRQ_MOVE_CLEANUP_VECTOR
);
519 cpumask_and(cleanup_mask
, cfg
->old_domain
, cpu_online_mask
);
520 cfg
->move_cleanup_count
= cpumask_weight(cleanup_mask
);
521 send_IPI_mask(cleanup_mask
, IRQ_MOVE_CLEANUP_VECTOR
);
522 free_cpumask_var(cleanup_mask
);
524 cfg
->move_in_progress
= 0;
527 static void __target_IO_APIC_irq(unsigned int irq
, unsigned int dest
, struct irq_cfg
*cfg
)
530 struct irq_pin_list
*entry
;
531 u8 vector
= cfg
->vector
;
533 entry
= cfg
->irq_2_pin
;
542 #ifdef CONFIG_INTR_REMAP
544 * With interrupt-remapping, destination information comes
545 * from interrupt-remapping table entry.
547 if (!irq_remapped(irq
))
548 io_apic_write(apic
, 0x11 + pin
*2, dest
);
550 io_apic_write(apic
, 0x11 + pin
*2, dest
);
552 reg
= io_apic_read(apic
, 0x10 + pin
*2);
553 reg
&= ~IO_APIC_REDIR_VECTOR_MASK
;
555 io_apic_modify(apic
, 0x10 + pin
*2, reg
);
563 assign_irq_vector(int irq
, struct irq_cfg
*cfg
, const struct cpumask
*mask
);
566 * Either sets desc->affinity to a valid value, and returns cpu_mask_to_apicid
567 * of that, or returns BAD_APICID and leaves desc->affinity untouched.
570 set_desc_affinity(struct irq_desc
*desc
, const struct cpumask
*mask
)
575 if (!cpumask_intersects(mask
, cpu_online_mask
))
579 cfg
= desc
->chip_data
;
580 if (assign_irq_vector(irq
, cfg
, mask
))
583 cpumask_and(desc
->affinity
, cfg
->domain
, mask
);
584 set_extra_move_desc(desc
, mask
);
585 return cpu_mask_to_apicid_and(desc
->affinity
, cpu_online_mask
);
589 set_ioapic_affinity_irq_desc(struct irq_desc
*desc
, const struct cpumask
*mask
)
597 cfg
= desc
->chip_data
;
599 spin_lock_irqsave(&ioapic_lock
, flags
);
600 dest
= set_desc_affinity(desc
, mask
);
601 if (dest
!= BAD_APICID
) {
602 /* Only the high 8 bits are valid. */
603 dest
= SET_APIC_LOGICAL_ID(dest
);
604 __target_IO_APIC_irq(irq
, dest
, cfg
);
606 spin_unlock_irqrestore(&ioapic_lock
, flags
);
610 set_ioapic_affinity_irq(unsigned int irq
, const struct cpumask
*mask
)
612 struct irq_desc
*desc
;
614 desc
= irq_to_desc(irq
);
616 set_ioapic_affinity_irq_desc(desc
, mask
);
618 #endif /* CONFIG_SMP */
621 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
622 * shared ISA-space IRQs, so we have to support them. We are super
623 * fast in the common case, and fast for shared ISA-space IRQs.
625 static void add_pin_to_irq_cpu(struct irq_cfg
*cfg
, int cpu
, int apic
, int pin
)
627 struct irq_pin_list
*entry
;
629 entry
= cfg
->irq_2_pin
;
631 entry
= get_one_free_irq_2_pin(cpu
);
633 printk(KERN_ERR
"can not alloc irq_2_pin to add %d - %d\n",
637 cfg
->irq_2_pin
= entry
;
643 while (entry
->next
) {
644 /* not again, please */
645 if (entry
->apic
== apic
&& entry
->pin
== pin
)
651 entry
->next
= get_one_free_irq_2_pin(cpu
);
658 * Reroute an IRQ to a different pin.
660 static void __init
replace_pin_at_irq_cpu(struct irq_cfg
*cfg
, int cpu
,
661 int oldapic
, int oldpin
,
662 int newapic
, int newpin
)
664 struct irq_pin_list
*entry
= cfg
->irq_2_pin
;
668 if (entry
->apic
== oldapic
&& entry
->pin
== oldpin
) {
669 entry
->apic
= newapic
;
672 /* every one is different, right? */
678 /* why? call replace before add? */
680 add_pin_to_irq_cpu(cfg
, cpu
, newapic
, newpin
);
683 static inline void io_apic_modify_irq(struct irq_cfg
*cfg
,
684 int mask_and
, int mask_or
,
685 void (*final
)(struct irq_pin_list
*entry
))
688 struct irq_pin_list
*entry
;
690 for (entry
= cfg
->irq_2_pin
; entry
!= NULL
; entry
= entry
->next
) {
693 reg
= io_apic_read(entry
->apic
, 0x10 + pin
* 2);
696 io_apic_modify(entry
->apic
, 0x10 + pin
* 2, reg
);
702 static void __unmask_IO_APIC_irq(struct irq_cfg
*cfg
)
704 io_apic_modify_irq(cfg
, ~IO_APIC_REDIR_MASKED
, 0, NULL
);
708 static void io_apic_sync(struct irq_pin_list
*entry
)
711 * Synchronize the IO-APIC and the CPU by doing
712 * a dummy read from the IO-APIC
714 struct io_apic __iomem
*io_apic
;
715 io_apic
= io_apic_base(entry
->apic
);
716 readl(&io_apic
->data
);
719 static void __mask_IO_APIC_irq(struct irq_cfg
*cfg
)
721 io_apic_modify_irq(cfg
, ~0, IO_APIC_REDIR_MASKED
, &io_apic_sync
);
723 #else /* CONFIG_X86_32 */
724 static void __mask_IO_APIC_irq(struct irq_cfg
*cfg
)
726 io_apic_modify_irq(cfg
, ~0, IO_APIC_REDIR_MASKED
, NULL
);
729 static void __mask_and_edge_IO_APIC_irq(struct irq_cfg
*cfg
)
731 io_apic_modify_irq(cfg
, ~IO_APIC_REDIR_LEVEL_TRIGGER
,
732 IO_APIC_REDIR_MASKED
, NULL
);
735 static void __unmask_and_level_IO_APIC_irq(struct irq_cfg
*cfg
)
737 io_apic_modify_irq(cfg
, ~IO_APIC_REDIR_MASKED
,
738 IO_APIC_REDIR_LEVEL_TRIGGER
, NULL
);
740 #endif /* CONFIG_X86_32 */
742 static void mask_IO_APIC_irq_desc(struct irq_desc
*desc
)
744 struct irq_cfg
*cfg
= desc
->chip_data
;
749 spin_lock_irqsave(&ioapic_lock
, flags
);
750 __mask_IO_APIC_irq(cfg
);
751 spin_unlock_irqrestore(&ioapic_lock
, flags
);
754 static void unmask_IO_APIC_irq_desc(struct irq_desc
*desc
)
756 struct irq_cfg
*cfg
= desc
->chip_data
;
759 spin_lock_irqsave(&ioapic_lock
, flags
);
760 __unmask_IO_APIC_irq(cfg
);
761 spin_unlock_irqrestore(&ioapic_lock
, flags
);
764 static void mask_IO_APIC_irq(unsigned int irq
)
766 struct irq_desc
*desc
= irq_to_desc(irq
);
768 mask_IO_APIC_irq_desc(desc
);
770 static void unmask_IO_APIC_irq(unsigned int irq
)
772 struct irq_desc
*desc
= irq_to_desc(irq
);
774 unmask_IO_APIC_irq_desc(desc
);
777 static void clear_IO_APIC_pin(unsigned int apic
, unsigned int pin
)
779 struct IO_APIC_route_entry entry
;
781 /* Check delivery_mode to be sure we're not clearing an SMI pin */
782 entry
= ioapic_read_entry(apic
, pin
);
783 if (entry
.delivery_mode
== dest_SMI
)
786 * Disable it in the IO-APIC irq-routing table:
788 ioapic_mask_entry(apic
, pin
);
791 static void clear_IO_APIC (void)
795 for (apic
= 0; apic
< nr_ioapics
; apic
++)
796 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++)
797 clear_IO_APIC_pin(apic
, pin
);
800 #if !defined(CONFIG_SMP) && defined(CONFIG_X86_32)
801 void send_IPI_self(int vector
)
808 apic_wait_icr_idle();
809 cfg
= APIC_DM_FIXED
| APIC_DEST_SELF
| vector
| APIC_DEST_LOGICAL
;
811 * Send the IPI. The write to APIC_ICR fires this off.
813 apic_write(APIC_ICR
, cfg
);
815 #endif /* !CONFIG_SMP && CONFIG_X86_32*/
819 * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
820 * specific CPU-side IRQs.
824 static int pirq_entries
[MAX_PIRQS
];
825 static int pirqs_enabled
;
827 static int __init
ioapic_pirq_setup(char *str
)
830 int ints
[MAX_PIRQS
+1];
832 get_options(str
, ARRAY_SIZE(ints
), ints
);
834 for (i
= 0; i
< MAX_PIRQS
; i
++)
835 pirq_entries
[i
] = -1;
838 apic_printk(APIC_VERBOSE
, KERN_INFO
839 "PIRQ redirection, working around broken MP-BIOS.\n");
841 if (ints
[0] < MAX_PIRQS
)
844 for (i
= 0; i
< max
; i
++) {
845 apic_printk(APIC_VERBOSE
, KERN_DEBUG
846 "... PIRQ%d -> IRQ %d\n", i
, ints
[i
+1]);
848 * PIRQs are mapped upside down, usually.
850 pirq_entries
[MAX_PIRQS
-i
-1] = ints
[i
+1];
855 __setup("pirq=", ioapic_pirq_setup
);
856 #endif /* CONFIG_X86_32 */
858 #ifdef CONFIG_INTR_REMAP
859 /* I/O APIC RTE contents at the OS boot up */
860 static struct IO_APIC_route_entry
*early_ioapic_entries
[MAX_IO_APICS
];
863 * Saves and masks all the unmasked IO-APIC RTE's
865 int save_mask_IO_APIC_setup(void)
867 union IO_APIC_reg_01 reg_01
;
872 * The number of IO-APIC IRQ registers (== #pins):
874 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
875 spin_lock_irqsave(&ioapic_lock
, flags
);
876 reg_01
.raw
= io_apic_read(apic
, 1);
877 spin_unlock_irqrestore(&ioapic_lock
, flags
);
878 nr_ioapic_registers
[apic
] = reg_01
.bits
.entries
+1;
881 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
882 early_ioapic_entries
[apic
] =
883 kzalloc(sizeof(struct IO_APIC_route_entry
) *
884 nr_ioapic_registers
[apic
], GFP_KERNEL
);
885 if (!early_ioapic_entries
[apic
])
889 for (apic
= 0; apic
< nr_ioapics
; apic
++)
890 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
891 struct IO_APIC_route_entry entry
;
893 entry
= early_ioapic_entries
[apic
][pin
] =
894 ioapic_read_entry(apic
, pin
);
897 ioapic_write_entry(apic
, pin
, entry
);
905 kfree(early_ioapic_entries
[apic
--]);
906 memset(early_ioapic_entries
, 0,
907 ARRAY_SIZE(early_ioapic_entries
));
912 void restore_IO_APIC_setup(void)
916 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
917 if (!early_ioapic_entries
[apic
])
919 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++)
920 ioapic_write_entry(apic
, pin
,
921 early_ioapic_entries
[apic
][pin
]);
922 kfree(early_ioapic_entries
[apic
]);
923 early_ioapic_entries
[apic
] = NULL
;
927 void reinit_intr_remapped_IO_APIC(int intr_remapping
)
930 * for now plain restore of previous settings.
931 * TBD: In the case of OS enabling interrupt-remapping,
932 * IO-APIC RTE's need to be setup to point to interrupt-remapping
933 * table entries. for now, do a plain restore, and wait for
934 * the setup_IO_APIC_irqs() to do proper initialization.
936 restore_IO_APIC_setup();
941 * Find the IRQ entry number of a certain pin.
943 static int find_irq_entry(int apic
, int pin
, int type
)
947 for (i
= 0; i
< mp_irq_entries
; i
++)
948 if (mp_irqs
[i
].irqtype
== type
&&
949 (mp_irqs
[i
].dstapic
== mp_ioapics
[apic
].apicid
||
950 mp_irqs
[i
].dstapic
== MP_APIC_ALL
) &&
951 mp_irqs
[i
].dstirq
== pin
)
958 * Find the pin to which IRQ[irq] (ISA) is connected
960 static int __init
find_isa_irq_pin(int irq
, int type
)
964 for (i
= 0; i
< mp_irq_entries
; i
++) {
965 int lbus
= mp_irqs
[i
].srcbus
;
967 if (test_bit(lbus
, mp_bus_not_pci
) &&
968 (mp_irqs
[i
].irqtype
== type
) &&
969 (mp_irqs
[i
].srcbusirq
== irq
))
971 return mp_irqs
[i
].dstirq
;
976 static int __init
find_isa_irq_apic(int irq
, int type
)
980 for (i
= 0; i
< mp_irq_entries
; i
++) {
981 int lbus
= mp_irqs
[i
].srcbus
;
983 if (test_bit(lbus
, mp_bus_not_pci
) &&
984 (mp_irqs
[i
].irqtype
== type
) &&
985 (mp_irqs
[i
].srcbusirq
== irq
))
988 if (i
< mp_irq_entries
) {
990 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
991 if (mp_ioapics
[apic
].apicid
== mp_irqs
[i
].dstapic
)
1000 * Find a specific PCI IRQ entry.
1001 * Not an __init, possibly needed by modules
1003 static int pin_2_irq(int idx
, int apic
, int pin
);
1005 int IO_APIC_get_PCI_irq_vector(int bus
, int slot
, int pin
)
1007 int apic
, i
, best_guess
= -1;
1009 apic_printk(APIC_DEBUG
, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
1011 if (test_bit(bus
, mp_bus_not_pci
)) {
1012 apic_printk(APIC_VERBOSE
, "PCI BIOS passed nonexistent PCI bus %d!\n", bus
);
1015 for (i
= 0; i
< mp_irq_entries
; i
++) {
1016 int lbus
= mp_irqs
[i
].srcbus
;
1018 for (apic
= 0; apic
< nr_ioapics
; apic
++)
1019 if (mp_ioapics
[apic
].apicid
== mp_irqs
[i
].dstapic
||
1020 mp_irqs
[i
].dstapic
== MP_APIC_ALL
)
1023 if (!test_bit(lbus
, mp_bus_not_pci
) &&
1024 !mp_irqs
[i
].irqtype
&&
1026 (slot
== ((mp_irqs
[i
].srcbusirq
>> 2) & 0x1f))) {
1027 int irq
= pin_2_irq(i
, apic
, mp_irqs
[i
].dstirq
);
1029 if (!(apic
|| IO_APIC_IRQ(irq
)))
1032 if (pin
== (mp_irqs
[i
].srcbusirq
& 3))
1035 * Use the first all-but-pin matching entry as a
1036 * best-guess fuzzy result for broken mptables.
1045 EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector
);
1047 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
1049 * EISA Edge/Level control register, ELCR
1051 static int EISA_ELCR(unsigned int irq
)
1053 if (irq
< NR_IRQS_LEGACY
) {
1054 unsigned int port
= 0x4d0 + (irq
>> 3);
1055 return (inb(port
) >> (irq
& 7)) & 1;
1057 apic_printk(APIC_VERBOSE
, KERN_INFO
1058 "Broken MPtable reports ISA irq %d\n", irq
);
1064 /* ISA interrupts are always polarity zero edge triggered,
1065 * when listed as conforming in the MP table. */
1067 #define default_ISA_trigger(idx) (0)
1068 #define default_ISA_polarity(idx) (0)
1070 /* EISA interrupts are always polarity zero and can be edge or level
1071 * trigger depending on the ELCR value. If an interrupt is listed as
1072 * EISA conforming in the MP table, that means its trigger type must
1073 * be read in from the ELCR */
1075 #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
1076 #define default_EISA_polarity(idx) default_ISA_polarity(idx)
1078 /* PCI interrupts are always polarity one level triggered,
1079 * when listed as conforming in the MP table. */
1081 #define default_PCI_trigger(idx) (1)
1082 #define default_PCI_polarity(idx) (1)
1084 /* MCA interrupts are always polarity zero level triggered,
1085 * when listed as conforming in the MP table. */
1087 #define default_MCA_trigger(idx) (1)
1088 #define default_MCA_polarity(idx) default_ISA_polarity(idx)
1090 static int MPBIOS_polarity(int idx
)
1092 int bus
= mp_irqs
[idx
].srcbus
;
1096 * Determine IRQ line polarity (high active or low active):
1098 switch (mp_irqs
[idx
].irqflag
& 3)
1100 case 0: /* conforms, ie. bus-type dependent polarity */
1101 if (test_bit(bus
, mp_bus_not_pci
))
1102 polarity
= default_ISA_polarity(idx
);
1104 polarity
= default_PCI_polarity(idx
);
1106 case 1: /* high active */
1111 case 2: /* reserved */
1113 printk(KERN_WARNING
"broken BIOS!!\n");
1117 case 3: /* low active */
1122 default: /* invalid */
1124 printk(KERN_WARNING
"broken BIOS!!\n");
1132 static int MPBIOS_trigger(int idx
)
1134 int bus
= mp_irqs
[idx
].srcbus
;
1138 * Determine IRQ trigger mode (edge or level sensitive):
1140 switch ((mp_irqs
[idx
].irqflag
>>2) & 3)
1142 case 0: /* conforms, ie. bus-type dependent */
1143 if (test_bit(bus
, mp_bus_not_pci
))
1144 trigger
= default_ISA_trigger(idx
);
1146 trigger
= default_PCI_trigger(idx
);
1147 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
1148 switch (mp_bus_id_to_type
[bus
]) {
1149 case MP_BUS_ISA
: /* ISA pin */
1151 /* set before the switch */
1154 case MP_BUS_EISA
: /* EISA pin */
1156 trigger
= default_EISA_trigger(idx
);
1159 case MP_BUS_PCI
: /* PCI pin */
1161 /* set before the switch */
1164 case MP_BUS_MCA
: /* MCA pin */
1166 trigger
= default_MCA_trigger(idx
);
1171 printk(KERN_WARNING
"broken BIOS!!\n");
1183 case 2: /* reserved */
1185 printk(KERN_WARNING
"broken BIOS!!\n");
1194 default: /* invalid */
1196 printk(KERN_WARNING
"broken BIOS!!\n");
1204 static inline int irq_polarity(int idx
)
1206 return MPBIOS_polarity(idx
);
1209 static inline int irq_trigger(int idx
)
1211 return MPBIOS_trigger(idx
);
1214 int (*ioapic_renumber_irq
)(int ioapic
, int irq
);
1215 static int pin_2_irq(int idx
, int apic
, int pin
)
1218 int bus
= mp_irqs
[idx
].srcbus
;
1221 * Debugging check, we are in big trouble if this message pops up!
1223 if (mp_irqs
[idx
].dstirq
!= pin
)
1224 printk(KERN_ERR
"broken BIOS or MPTABLE parser, ayiee!!\n");
1226 if (test_bit(bus
, mp_bus_not_pci
)) {
1227 irq
= mp_irqs
[idx
].srcbusirq
;
1230 * PCI IRQs are mapped in order
1234 irq
+= nr_ioapic_registers
[i
++];
1237 * For MPS mode, so far only needed by ES7000 platform
1239 if (ioapic_renumber_irq
)
1240 irq
= ioapic_renumber_irq(apic
, irq
);
1243 #ifdef CONFIG_X86_32
1245 * PCI IRQ command line redirection. Yes, limits are hardcoded.
1247 if ((pin
>= 16) && (pin
<= 23)) {
1248 if (pirq_entries
[pin
-16] != -1) {
1249 if (!pirq_entries
[pin
-16]) {
1250 apic_printk(APIC_VERBOSE
, KERN_DEBUG
1251 "disabling PIRQ%d\n", pin
-16);
1253 irq
= pirq_entries
[pin
-16];
1254 apic_printk(APIC_VERBOSE
, KERN_DEBUG
1255 "using PIRQ%d -> IRQ %d\n",
1265 void lock_vector_lock(void)
1267 /* Used to the online set of cpus does not change
1268 * during assign_irq_vector.
1270 spin_lock(&vector_lock
);
1273 void unlock_vector_lock(void)
1275 spin_unlock(&vector_lock
);
1279 __assign_irq_vector(int irq
, struct irq_cfg
*cfg
, const struct cpumask
*mask
)
1282 * NOTE! The local APIC isn't very good at handling
1283 * multiple interrupts at the same interrupt level.
1284 * As the interrupt level is determined by taking the
1285 * vector number and shifting that right by 4, we
1286 * want to spread these out a bit so that they don't
1287 * all fall in the same interrupt level.
1289 * Also, we've got to be careful not to trash gate
1290 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1292 static int current_vector
= FIRST_DEVICE_VECTOR
, current_offset
= 0;
1293 unsigned int old_vector
;
1295 cpumask_var_t tmp_mask
;
1297 if ((cfg
->move_in_progress
) || cfg
->move_cleanup_count
)
1300 if (!alloc_cpumask_var(&tmp_mask
, GFP_ATOMIC
))
1303 old_vector
= cfg
->vector
;
1305 cpumask_and(tmp_mask
, mask
, cpu_online_mask
);
1306 cpumask_and(tmp_mask
, cfg
->domain
, tmp_mask
);
1307 if (!cpumask_empty(tmp_mask
)) {
1308 free_cpumask_var(tmp_mask
);
1313 /* Only try and allocate irqs on cpus that are present */
1315 for_each_cpu_and(cpu
, mask
, cpu_online_mask
) {
1319 vector_allocation_domain(cpu
, tmp_mask
);
1321 vector
= current_vector
;
1322 offset
= current_offset
;
1325 if (vector
>= first_system_vector
) {
1326 /* If out of vectors on large boxen, must share them. */
1327 offset
= (offset
+ 1) % 8;
1328 vector
= FIRST_DEVICE_VECTOR
+ offset
;
1330 if (unlikely(current_vector
== vector
))
1333 if (test_bit(vector
, used_vectors
))
1336 for_each_cpu_and(new_cpu
, tmp_mask
, cpu_online_mask
)
1337 if (per_cpu(vector_irq
, new_cpu
)[vector
] != -1)
1340 current_vector
= vector
;
1341 current_offset
= offset
;
1343 cfg
->move_in_progress
= 1;
1344 cpumask_copy(cfg
->old_domain
, cfg
->domain
);
1346 for_each_cpu_and(new_cpu
, tmp_mask
, cpu_online_mask
)
1347 per_cpu(vector_irq
, new_cpu
)[vector
] = irq
;
1348 cfg
->vector
= vector
;
1349 cpumask_copy(cfg
->domain
, tmp_mask
);
1353 free_cpumask_var(tmp_mask
);
1358 assign_irq_vector(int irq
, struct irq_cfg
*cfg
, const struct cpumask
*mask
)
1361 unsigned long flags
;
1363 spin_lock_irqsave(&vector_lock
, flags
);
1364 err
= __assign_irq_vector(irq
, cfg
, mask
);
1365 spin_unlock_irqrestore(&vector_lock
, flags
);
1369 static void __clear_irq_vector(int irq
, struct irq_cfg
*cfg
)
1373 BUG_ON(!cfg
->vector
);
1375 vector
= cfg
->vector
;
1376 for_each_cpu_and(cpu
, cfg
->domain
, cpu_online_mask
)
1377 per_cpu(vector_irq
, cpu
)[vector
] = -1;
1380 cpumask_clear(cfg
->domain
);
1382 if (likely(!cfg
->move_in_progress
))
1384 for_each_cpu_and(cpu
, cfg
->old_domain
, cpu_online_mask
) {
1385 for (vector
= FIRST_EXTERNAL_VECTOR
; vector
< NR_VECTORS
;
1387 if (per_cpu(vector_irq
, cpu
)[vector
] != irq
)
1389 per_cpu(vector_irq
, cpu
)[vector
] = -1;
1393 cfg
->move_in_progress
= 0;
1396 void __setup_vector_irq(int cpu
)
1398 /* Initialize vector_irq on a new cpu */
1399 /* This function must be called with vector_lock held */
1401 struct irq_cfg
*cfg
;
1402 struct irq_desc
*desc
;
1404 /* Mark the inuse vectors */
1405 for_each_irq_desc(irq
, desc
) {
1406 cfg
= desc
->chip_data
;
1407 if (!cpumask_test_cpu(cpu
, cfg
->domain
))
1409 vector
= cfg
->vector
;
1410 per_cpu(vector_irq
, cpu
)[vector
] = irq
;
1412 /* Mark the free vectors */
1413 for (vector
= 0; vector
< NR_VECTORS
; ++vector
) {
1414 irq
= per_cpu(vector_irq
, cpu
)[vector
];
1419 if (!cpumask_test_cpu(cpu
, cfg
->domain
))
1420 per_cpu(vector_irq
, cpu
)[vector
] = -1;
1424 static struct irq_chip ioapic_chip
;
1425 #ifdef CONFIG_INTR_REMAP
1426 static struct irq_chip ir_ioapic_chip
;
1429 #define IOAPIC_AUTO -1
1430 #define IOAPIC_EDGE 0
1431 #define IOAPIC_LEVEL 1
1433 #ifdef CONFIG_X86_32
1434 static inline int IO_APIC_irq_trigger(int irq
)
1438 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1439 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1440 idx
= find_irq_entry(apic
, pin
, mp_INT
);
1441 if ((idx
!= -1) && (irq
== pin_2_irq(idx
, apic
, pin
)))
1442 return irq_trigger(idx
);
1446 * nonexistent IRQs are edge default
1451 static inline int IO_APIC_irq_trigger(int irq
)
1457 static void ioapic_register_intr(int irq
, struct irq_desc
*desc
, unsigned long trigger
)
1460 if ((trigger
== IOAPIC_AUTO
&& IO_APIC_irq_trigger(irq
)) ||
1461 trigger
== IOAPIC_LEVEL
)
1462 desc
->status
|= IRQ_LEVEL
;
1464 desc
->status
&= ~IRQ_LEVEL
;
1466 #ifdef CONFIG_INTR_REMAP
1467 if (irq_remapped(irq
)) {
1468 desc
->status
|= IRQ_MOVE_PCNTXT
;
1470 set_irq_chip_and_handler_name(irq
, &ir_ioapic_chip
,
1474 set_irq_chip_and_handler_name(irq
, &ir_ioapic_chip
,
1475 handle_edge_irq
, "edge");
1479 if ((trigger
== IOAPIC_AUTO
&& IO_APIC_irq_trigger(irq
)) ||
1480 trigger
== IOAPIC_LEVEL
)
1481 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
1485 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
1486 handle_edge_irq
, "edge");
1489 static int setup_ioapic_entry(int apic
, int irq
,
1490 struct IO_APIC_route_entry
*entry
,
1491 unsigned int destination
, int trigger
,
1492 int polarity
, int vector
)
1495 * add it to the IO-APIC irq-routing table:
1497 memset(entry
,0,sizeof(*entry
));
1499 #ifdef CONFIG_INTR_REMAP
1500 if (intr_remapping_enabled
) {
1501 struct intel_iommu
*iommu
= map_ioapic_to_ir(apic
);
1503 struct IR_IO_APIC_route_entry
*ir_entry
=
1504 (struct IR_IO_APIC_route_entry
*) entry
;
1508 panic("No mapping iommu for ioapic %d\n", apic
);
1510 index
= alloc_irte(iommu
, irq
, 1);
1512 panic("Failed to allocate IRTE for ioapic %d\n", apic
);
1514 memset(&irte
, 0, sizeof(irte
));
1517 irte
.dst_mode
= INT_DEST_MODE
;
1518 irte
.trigger_mode
= trigger
;
1519 irte
.dlvry_mode
= INT_DELIVERY_MODE
;
1520 irte
.vector
= vector
;
1521 irte
.dest_id
= IRTE_DEST(destination
);
1523 modify_irte(irq
, &irte
);
1525 ir_entry
->index2
= (index
>> 15) & 0x1;
1527 ir_entry
->format
= 1;
1528 ir_entry
->index
= (index
& 0x7fff);
1532 entry
->delivery_mode
= INT_DELIVERY_MODE
;
1533 entry
->dest_mode
= INT_DEST_MODE
;
1534 entry
->dest
= destination
;
1537 entry
->mask
= 0; /* enable IRQ */
1538 entry
->trigger
= trigger
;
1539 entry
->polarity
= polarity
;
1540 entry
->vector
= vector
;
1542 /* Mask level triggered irqs.
1543 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
1550 static void setup_IO_APIC_irq(int apic
, int pin
, unsigned int irq
, struct irq_desc
*desc
,
1551 int trigger
, int polarity
)
1553 struct irq_cfg
*cfg
;
1554 struct IO_APIC_route_entry entry
;
1557 if (!IO_APIC_IRQ(irq
))
1560 cfg
= desc
->chip_data
;
1562 if (assign_irq_vector(irq
, cfg
, TARGET_CPUS
))
1565 dest
= cpu_mask_to_apicid_and(cfg
->domain
, TARGET_CPUS
);
1567 apic_printk(APIC_VERBOSE
,KERN_DEBUG
1568 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
1569 "IRQ %d Mode:%i Active:%i)\n",
1570 apic
, mp_ioapics
[apic
].apicid
, pin
, cfg
->vector
,
1571 irq
, trigger
, polarity
);
1574 if (setup_ioapic_entry(mp_ioapics
[apic
].apicid
, irq
, &entry
,
1575 dest
, trigger
, polarity
, cfg
->vector
)) {
1576 printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
1577 mp_ioapics
[apic
].apicid
, pin
);
1578 __clear_irq_vector(irq
, cfg
);
1582 ioapic_register_intr(irq
, desc
, trigger
);
1583 if (irq
< NR_IRQS_LEGACY
)
1584 disable_8259A_irq(irq
);
1586 ioapic_write_entry(apic
, pin
, entry
);
1589 static void __init
setup_IO_APIC_irqs(void)
1591 int apic
, pin
, idx
, irq
;
1593 struct irq_desc
*desc
;
1594 struct irq_cfg
*cfg
;
1595 int cpu
= boot_cpu_id
;
1597 apic_printk(APIC_VERBOSE
, KERN_DEBUG
"init IO_APIC IRQs\n");
1599 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1600 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1602 idx
= find_irq_entry(apic
, pin
, mp_INT
);
1606 apic_printk(APIC_VERBOSE
,
1607 KERN_DEBUG
" %d-%d",
1608 mp_ioapics
[apic
].apicid
, pin
);
1610 apic_printk(APIC_VERBOSE
, " %d-%d",
1611 mp_ioapics
[apic
].apicid
, pin
);
1615 apic_printk(APIC_VERBOSE
,
1616 " (apicid-pin) not connected\n");
1620 irq
= pin_2_irq(idx
, apic
, pin
);
1621 #ifdef CONFIG_X86_32
1622 if (multi_timer_check(apic
, irq
))
1625 desc
= irq_to_desc_alloc_cpu(irq
, cpu
);
1627 printk(KERN_INFO
"can not get irq_desc for %d\n", irq
);
1630 cfg
= desc
->chip_data
;
1631 add_pin_to_irq_cpu(cfg
, cpu
, apic
, pin
);
1633 setup_IO_APIC_irq(apic
, pin
, irq
, desc
,
1634 irq_trigger(idx
), irq_polarity(idx
));
1639 apic_printk(APIC_VERBOSE
,
1640 " (apicid-pin) not connected\n");
1644 * Set up the timer pin, possibly with the 8259A-master behind.
1646 static void __init
setup_timer_IRQ0_pin(unsigned int apic
, unsigned int pin
,
1649 struct IO_APIC_route_entry entry
;
1651 #ifdef CONFIG_INTR_REMAP
1652 if (intr_remapping_enabled
)
1656 memset(&entry
, 0, sizeof(entry
));
1659 * We use logical delivery to get the timer IRQ
1662 entry
.dest_mode
= INT_DEST_MODE
;
1663 entry
.mask
= 1; /* mask IRQ now */
1664 entry
.dest
= cpu_mask_to_apicid(TARGET_CPUS
);
1665 entry
.delivery_mode
= INT_DELIVERY_MODE
;
1668 entry
.vector
= vector
;
1671 * The timer IRQ doesn't have to know that behind the
1672 * scene we may have a 8259A-master in AEOI mode ...
1674 set_irq_chip_and_handler_name(0, &ioapic_chip
, handle_edge_irq
, "edge");
1677 * Add it to the IO-APIC irq-routing table:
1679 ioapic_write_entry(apic
, pin
, entry
);
1683 __apicdebuginit(void) print_IO_APIC(void)
1686 union IO_APIC_reg_00 reg_00
;
1687 union IO_APIC_reg_01 reg_01
;
1688 union IO_APIC_reg_02 reg_02
;
1689 union IO_APIC_reg_03 reg_03
;
1690 unsigned long flags
;
1691 struct irq_cfg
*cfg
;
1692 struct irq_desc
*desc
;
1695 if (apic_verbosity
== APIC_QUIET
)
1698 printk(KERN_DEBUG
"number of MP IRQ sources: %d.\n", mp_irq_entries
);
1699 for (i
= 0; i
< nr_ioapics
; i
++)
1700 printk(KERN_DEBUG
"number of IO-APIC #%d registers: %d.\n",
1701 mp_ioapics
[i
].apicid
, nr_ioapic_registers
[i
]);
1704 * We are a bit conservative about what we expect. We have to
1705 * know about every hardware change ASAP.
1707 printk(KERN_INFO
"testing the IO APIC.......................\n");
1709 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1711 spin_lock_irqsave(&ioapic_lock
, flags
);
1712 reg_00
.raw
= io_apic_read(apic
, 0);
1713 reg_01
.raw
= io_apic_read(apic
, 1);
1714 if (reg_01
.bits
.version
>= 0x10)
1715 reg_02
.raw
= io_apic_read(apic
, 2);
1716 if (reg_01
.bits
.version
>= 0x20)
1717 reg_03
.raw
= io_apic_read(apic
, 3);
1718 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1721 printk(KERN_DEBUG
"IO APIC #%d......\n", mp_ioapics
[apic
].apicid
);
1722 printk(KERN_DEBUG
".... register #00: %08X\n", reg_00
.raw
);
1723 printk(KERN_DEBUG
"....... : physical APIC id: %02X\n", reg_00
.bits
.ID
);
1724 printk(KERN_DEBUG
"....... : Delivery Type: %X\n", reg_00
.bits
.delivery_type
);
1725 printk(KERN_DEBUG
"....... : LTS : %X\n", reg_00
.bits
.LTS
);
1727 printk(KERN_DEBUG
".... register #01: %08X\n", *(int *)®_01
);
1728 printk(KERN_DEBUG
"....... : max redirection entries: %04X\n", reg_01
.bits
.entries
);
1730 printk(KERN_DEBUG
"....... : PRQ implemented: %X\n", reg_01
.bits
.PRQ
);
1731 printk(KERN_DEBUG
"....... : IO APIC version: %04X\n", reg_01
.bits
.version
);
1734 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
1735 * but the value of reg_02 is read as the previous read register
1736 * value, so ignore it if reg_02 == reg_01.
1738 if (reg_01
.bits
.version
>= 0x10 && reg_02
.raw
!= reg_01
.raw
) {
1739 printk(KERN_DEBUG
".... register #02: %08X\n", reg_02
.raw
);
1740 printk(KERN_DEBUG
"....... : arbitration: %02X\n", reg_02
.bits
.arbitration
);
1744 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
1745 * or reg_03, but the value of reg_0[23] is read as the previous read
1746 * register value, so ignore it if reg_03 == reg_0[12].
1748 if (reg_01
.bits
.version
>= 0x20 && reg_03
.raw
!= reg_02
.raw
&&
1749 reg_03
.raw
!= reg_01
.raw
) {
1750 printk(KERN_DEBUG
".... register #03: %08X\n", reg_03
.raw
);
1751 printk(KERN_DEBUG
"....... : Boot DT : %X\n", reg_03
.bits
.boot_DT
);
1754 printk(KERN_DEBUG
".... IRQ redirection table:\n");
1756 printk(KERN_DEBUG
" NR Dst Mask Trig IRR Pol"
1757 " Stat Dmod Deli Vect: \n");
1759 for (i
= 0; i
<= reg_01
.bits
.entries
; i
++) {
1760 struct IO_APIC_route_entry entry
;
1762 entry
= ioapic_read_entry(apic
, i
);
1764 printk(KERN_DEBUG
" %02x %03X ",
1769 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1774 entry
.delivery_status
,
1776 entry
.delivery_mode
,
1781 printk(KERN_DEBUG
"IRQ to pin mappings:\n");
1782 for_each_irq_desc(irq
, desc
) {
1783 struct irq_pin_list
*entry
;
1785 cfg
= desc
->chip_data
;
1786 entry
= cfg
->irq_2_pin
;
1789 printk(KERN_DEBUG
"IRQ%d ", irq
);
1791 printk("-> %d:%d", entry
->apic
, entry
->pin
);
1794 entry
= entry
->next
;
1799 printk(KERN_INFO
".................................... done.\n");
1804 __apicdebuginit(void) print_APIC_bitfield(int base
)
1809 if (apic_verbosity
== APIC_QUIET
)
1812 printk(KERN_DEBUG
"0123456789abcdef0123456789abcdef\n" KERN_DEBUG
);
1813 for (i
= 0; i
< 8; i
++) {
1814 v
= apic_read(base
+ i
*0x10);
1815 for (j
= 0; j
< 32; j
++) {
1825 __apicdebuginit(void) print_local_APIC(void *dummy
)
1827 unsigned int v
, ver
, maxlvt
;
1830 if (apic_verbosity
== APIC_QUIET
)
1833 printk("\n" KERN_DEBUG
"printing local APIC contents on CPU#%d/%d:\n",
1834 smp_processor_id(), hard_smp_processor_id());
1835 v
= apic_read(APIC_ID
);
1836 printk(KERN_INFO
"... APIC ID: %08x (%01x)\n", v
, read_apic_id());
1837 v
= apic_read(APIC_LVR
);
1838 printk(KERN_INFO
"... APIC VERSION: %08x\n", v
);
1839 ver
= GET_APIC_VERSION(v
);
1840 maxlvt
= lapic_get_maxlvt();
1842 v
= apic_read(APIC_TASKPRI
);
1843 printk(KERN_DEBUG
"... APIC TASKPRI: %08x (%02x)\n", v
, v
& APIC_TPRI_MASK
);
1845 if (APIC_INTEGRATED(ver
)) { /* !82489DX */
1846 if (!APIC_XAPIC(ver
)) {
1847 v
= apic_read(APIC_ARBPRI
);
1848 printk(KERN_DEBUG
"... APIC ARBPRI: %08x (%02x)\n", v
,
1849 v
& APIC_ARBPRI_MASK
);
1851 v
= apic_read(APIC_PROCPRI
);
1852 printk(KERN_DEBUG
"... APIC PROCPRI: %08x\n", v
);
1856 * Remote read supported only in the 82489DX and local APIC for
1857 * Pentium processors.
1859 if (!APIC_INTEGRATED(ver
) || maxlvt
== 3) {
1860 v
= apic_read(APIC_RRR
);
1861 printk(KERN_DEBUG
"... APIC RRR: %08x\n", v
);
1864 v
= apic_read(APIC_LDR
);
1865 printk(KERN_DEBUG
"... APIC LDR: %08x\n", v
);
1866 if (!x2apic_enabled()) {
1867 v
= apic_read(APIC_DFR
);
1868 printk(KERN_DEBUG
"... APIC DFR: %08x\n", v
);
1870 v
= apic_read(APIC_SPIV
);
1871 printk(KERN_DEBUG
"... APIC SPIV: %08x\n", v
);
1873 printk(KERN_DEBUG
"... APIC ISR field:\n");
1874 print_APIC_bitfield(APIC_ISR
);
1875 printk(KERN_DEBUG
"... APIC TMR field:\n");
1876 print_APIC_bitfield(APIC_TMR
);
1877 printk(KERN_DEBUG
"... APIC IRR field:\n");
1878 print_APIC_bitfield(APIC_IRR
);
1880 if (APIC_INTEGRATED(ver
)) { /* !82489DX */
1881 if (maxlvt
> 3) /* Due to the Pentium erratum 3AP. */
1882 apic_write(APIC_ESR
, 0);
1884 v
= apic_read(APIC_ESR
);
1885 printk(KERN_DEBUG
"... APIC ESR: %08x\n", v
);
1888 icr
= apic_icr_read();
1889 printk(KERN_DEBUG
"... APIC ICR: %08x\n", (u32
)icr
);
1890 printk(KERN_DEBUG
"... APIC ICR2: %08x\n", (u32
)(icr
>> 32));
1892 v
= apic_read(APIC_LVTT
);
1893 printk(KERN_DEBUG
"... APIC LVTT: %08x\n", v
);
1895 if (maxlvt
> 3) { /* PC is LVT#4. */
1896 v
= apic_read(APIC_LVTPC
);
1897 printk(KERN_DEBUG
"... APIC LVTPC: %08x\n", v
);
1899 v
= apic_read(APIC_LVT0
);
1900 printk(KERN_DEBUG
"... APIC LVT0: %08x\n", v
);
1901 v
= apic_read(APIC_LVT1
);
1902 printk(KERN_DEBUG
"... APIC LVT1: %08x\n", v
);
1904 if (maxlvt
> 2) { /* ERR is LVT#3. */
1905 v
= apic_read(APIC_LVTERR
);
1906 printk(KERN_DEBUG
"... APIC LVTERR: %08x\n", v
);
1909 v
= apic_read(APIC_TMICT
);
1910 printk(KERN_DEBUG
"... APIC TMICT: %08x\n", v
);
1911 v
= apic_read(APIC_TMCCT
);
1912 printk(KERN_DEBUG
"... APIC TMCCT: %08x\n", v
);
1913 v
= apic_read(APIC_TDCR
);
1914 printk(KERN_DEBUG
"... APIC TDCR: %08x\n", v
);
1918 __apicdebuginit(void) print_all_local_APICs(void)
1923 for_each_online_cpu(cpu
)
1924 smp_call_function_single(cpu
, print_local_APIC
, NULL
, 1);
1928 __apicdebuginit(void) print_PIC(void)
1931 unsigned long flags
;
1933 if (apic_verbosity
== APIC_QUIET
)
1936 printk(KERN_DEBUG
"\nprinting PIC contents\n");
1938 spin_lock_irqsave(&i8259A_lock
, flags
);
1940 v
= inb(0xa1) << 8 | inb(0x21);
1941 printk(KERN_DEBUG
"... PIC IMR: %04x\n", v
);
1943 v
= inb(0xa0) << 8 | inb(0x20);
1944 printk(KERN_DEBUG
"... PIC IRR: %04x\n", v
);
1948 v
= inb(0xa0) << 8 | inb(0x20);
1952 spin_unlock_irqrestore(&i8259A_lock
, flags
);
1954 printk(KERN_DEBUG
"... PIC ISR: %04x\n", v
);
1956 v
= inb(0x4d1) << 8 | inb(0x4d0);
1957 printk(KERN_DEBUG
"... PIC ELCR: %04x\n", v
);
1960 __apicdebuginit(int) print_all_ICs(void)
1963 print_all_local_APICs();
1969 fs_initcall(print_all_ICs
);
1972 /* Where if anywhere is the i8259 connect in external int mode */
1973 static struct { int pin
, apic
; } ioapic_i8259
= { -1, -1 };
1975 void __init
enable_IO_APIC(void)
1977 union IO_APIC_reg_01 reg_01
;
1978 int i8259_apic
, i8259_pin
;
1980 unsigned long flags
;
1982 #ifdef CONFIG_X86_32
1985 for (i
= 0; i
< MAX_PIRQS
; i
++)
1986 pirq_entries
[i
] = -1;
1990 * The number of IO-APIC IRQ registers (== #pins):
1992 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1993 spin_lock_irqsave(&ioapic_lock
, flags
);
1994 reg_01
.raw
= io_apic_read(apic
, 1);
1995 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1996 nr_ioapic_registers
[apic
] = reg_01
.bits
.entries
+1;
1998 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
2000 /* See if any of the pins is in ExtINT mode */
2001 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
2002 struct IO_APIC_route_entry entry
;
2003 entry
= ioapic_read_entry(apic
, pin
);
2005 /* If the interrupt line is enabled and in ExtInt mode
2006 * I have found the pin where the i8259 is connected.
2008 if ((entry
.mask
== 0) && (entry
.delivery_mode
== dest_ExtINT
)) {
2009 ioapic_i8259
.apic
= apic
;
2010 ioapic_i8259
.pin
= pin
;
2016 /* Look to see what if the MP table has reported the ExtINT */
2017 /* If we could not find the appropriate pin by looking at the ioapic
2018 * the i8259 probably is not connected the ioapic but give the
2019 * mptable a chance anyway.
2021 i8259_pin
= find_isa_irq_pin(0, mp_ExtINT
);
2022 i8259_apic
= find_isa_irq_apic(0, mp_ExtINT
);
2023 /* Trust the MP table if nothing is setup in the hardware */
2024 if ((ioapic_i8259
.pin
== -1) && (i8259_pin
>= 0)) {
2025 printk(KERN_WARNING
"ExtINT not setup in hardware but reported by MP table\n");
2026 ioapic_i8259
.pin
= i8259_pin
;
2027 ioapic_i8259
.apic
= i8259_apic
;
2029 /* Complain if the MP table and the hardware disagree */
2030 if (((ioapic_i8259
.apic
!= i8259_apic
) || (ioapic_i8259
.pin
!= i8259_pin
)) &&
2031 (i8259_pin
>= 0) && (ioapic_i8259
.pin
>= 0))
2033 printk(KERN_WARNING
"ExtINT in hardware and MP table differ\n");
2037 * Do not trust the IO-APIC being empty at bootup
2043 * Not an __init, needed by the reboot code
2045 void disable_IO_APIC(void)
2048 * Clear the IO-APIC before rebooting:
2053 * If the i8259 is routed through an IOAPIC
2054 * Put that IOAPIC in virtual wire mode
2055 * so legacy interrupts can be delivered.
2057 if (ioapic_i8259
.pin
!= -1) {
2058 struct IO_APIC_route_entry entry
;
2060 memset(&entry
, 0, sizeof(entry
));
2061 entry
.mask
= 0; /* Enabled */
2062 entry
.trigger
= 0; /* Edge */
2064 entry
.polarity
= 0; /* High */
2065 entry
.delivery_status
= 0;
2066 entry
.dest_mode
= 0; /* Physical */
2067 entry
.delivery_mode
= dest_ExtINT
; /* ExtInt */
2069 entry
.dest
= read_apic_id();
2072 * Add it to the IO-APIC irq-routing table:
2074 ioapic_write_entry(ioapic_i8259
.apic
, ioapic_i8259
.pin
, entry
);
2077 disconnect_bsp_APIC(ioapic_i8259
.pin
!= -1);
2080 #ifdef CONFIG_X86_32
2082 * function to set the IO-APIC physical IDs based on the
2083 * values stored in the MPC table.
2085 * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
2088 static void __init
setup_ioapic_ids_from_mpc(void)
2090 union IO_APIC_reg_00 reg_00
;
2091 physid_mask_t phys_id_present_map
;
2094 unsigned char old_id
;
2095 unsigned long flags
;
2097 if (x86_quirks
->setup_ioapic_ids
&& x86_quirks
->setup_ioapic_ids())
2101 * Don't check I/O APIC IDs for xAPIC systems. They have
2102 * no meaning without the serial APIC bus.
2104 if (!(boot_cpu_data
.x86_vendor
== X86_VENDOR_INTEL
)
2105 || APIC_XAPIC(apic_version
[boot_cpu_physical_apicid
]))
2108 * This is broken; anything with a real cpu count has to
2109 * circumvent this idiocy regardless.
2111 phys_id_present_map
= ioapic_phys_id_map(phys_cpu_present_map
);
2114 * Set the IOAPIC ID to the value stored in the MPC table.
2116 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
2118 /* Read the register 0 value */
2119 spin_lock_irqsave(&ioapic_lock
, flags
);
2120 reg_00
.raw
= io_apic_read(apic
, 0);
2121 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2123 old_id
= mp_ioapics
[apic
].apicid
;
2125 if (mp_ioapics
[apic
].apicid
>= get_physical_broadcast()) {
2126 printk(KERN_ERR
"BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
2127 apic
, mp_ioapics
[apic
].apicid
);
2128 printk(KERN_ERR
"... fixing up to %d. (tell your hw vendor)\n",
2130 mp_ioapics
[apic
].apicid
= reg_00
.bits
.ID
;
2134 * Sanity check, is the ID really free? Every APIC in a
2135 * system must have a unique ID or we get lots of nice
2136 * 'stuck on smp_invalidate_needed IPI wait' messages.
2138 if (check_apicid_used(phys_id_present_map
,
2139 mp_ioapics
[apic
].apicid
)) {
2140 printk(KERN_ERR
"BIOS bug, IO-APIC#%d ID %d is already used!...\n",
2141 apic
, mp_ioapics
[apic
].apicid
);
2142 for (i
= 0; i
< get_physical_broadcast(); i
++)
2143 if (!physid_isset(i
, phys_id_present_map
))
2145 if (i
>= get_physical_broadcast())
2146 panic("Max APIC ID exceeded!\n");
2147 printk(KERN_ERR
"... fixing up to %d. (tell your hw vendor)\n",
2149 physid_set(i
, phys_id_present_map
);
2150 mp_ioapics
[apic
].apicid
= i
;
2153 tmp
= apicid_to_cpu_present(mp_ioapics
[apic
].apicid
);
2154 apic_printk(APIC_VERBOSE
, "Setting %d in the "
2155 "phys_id_present_map\n",
2156 mp_ioapics
[apic
].apicid
);
2157 physids_or(phys_id_present_map
, phys_id_present_map
, tmp
);
2162 * We need to adjust the IRQ routing table
2163 * if the ID changed.
2165 if (old_id
!= mp_ioapics
[apic
].apicid
)
2166 for (i
= 0; i
< mp_irq_entries
; i
++)
2167 if (mp_irqs
[i
].dstapic
== old_id
)
2169 = mp_ioapics
[apic
].apicid
;
2172 * Read the right value from the MPC table and
2173 * write it into the ID register.
2175 apic_printk(APIC_VERBOSE
, KERN_INFO
2176 "...changing IO-APIC physical APIC ID to %d ...",
2177 mp_ioapics
[apic
].apicid
);
2179 reg_00
.bits
.ID
= mp_ioapics
[apic
].apicid
;
2180 spin_lock_irqsave(&ioapic_lock
, flags
);
2181 io_apic_write(apic
, 0, reg_00
.raw
);
2182 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2187 spin_lock_irqsave(&ioapic_lock
, flags
);
2188 reg_00
.raw
= io_apic_read(apic
, 0);
2189 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2190 if (reg_00
.bits
.ID
!= mp_ioapics
[apic
].apicid
)
2191 printk("could not set ID!\n");
2193 apic_printk(APIC_VERBOSE
, " ok.\n");
2198 int no_timer_check __initdata
;
2200 static int __init
notimercheck(char *s
)
2205 __setup("no_timer_check", notimercheck
);
2208 * There is a nasty bug in some older SMP boards, their mptable lies
2209 * about the timer IRQ. We do the following to work around the situation:
2211 * - timer IRQ defaults to IO-APIC IRQ
2212 * - if this function detects that timer IRQs are defunct, then we fall
2213 * back to ISA timer IRQs
2215 static int __init
timer_irq_works(void)
2217 unsigned long t1
= jiffies
;
2218 unsigned long flags
;
2223 local_save_flags(flags
);
2225 /* Let ten ticks pass... */
2226 mdelay((10 * 1000) / HZ
);
2227 local_irq_restore(flags
);
2230 * Expect a few ticks at least, to be sure some possible
2231 * glue logic does not lock up after one or two first
2232 * ticks in a non-ExtINT mode. Also the local APIC
2233 * might have cached one ExtINT interrupt. Finally, at
2234 * least one tick may be lost due to delays.
2238 if (time_after(jiffies
, t1
+ 4))
2244 * In the SMP+IOAPIC case it might happen that there are an unspecified
2245 * number of pending IRQ events unhandled. These cases are very rare,
2246 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
2247 * better to do it this way as thus we do not have to be aware of
2248 * 'pending' interrupts in the IRQ path, except at this point.
2251 * Edge triggered needs to resend any interrupt
2252 * that was delayed but this is now handled in the device
2257 * Starting up a edge-triggered IO-APIC interrupt is
2258 * nasty - we need to make sure that we get the edge.
2259 * If it is already asserted for some reason, we need
2260 * return 1 to indicate that is was pending.
2262 * This is not complete - we should be able to fake
2263 * an edge even if it isn't on the 8259A...
2266 static unsigned int startup_ioapic_irq(unsigned int irq
)
2268 int was_pending
= 0;
2269 unsigned long flags
;
2270 struct irq_cfg
*cfg
;
2272 spin_lock_irqsave(&ioapic_lock
, flags
);
2273 if (irq
< NR_IRQS_LEGACY
) {
2274 disable_8259A_irq(irq
);
2275 if (i8259A_irq_pending(irq
))
2279 __unmask_IO_APIC_irq(cfg
);
2280 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2285 #ifdef CONFIG_X86_64
2286 static int ioapic_retrigger_irq(unsigned int irq
)
2289 struct irq_cfg
*cfg
= irq_cfg(irq
);
2290 unsigned long flags
;
2292 spin_lock_irqsave(&vector_lock
, flags
);
2293 send_IPI_mask(cpumask_of(cpumask_first(cfg
->domain
)), cfg
->vector
);
2294 spin_unlock_irqrestore(&vector_lock
, flags
);
2299 static int ioapic_retrigger_irq(unsigned int irq
)
2301 send_IPI_self(irq_cfg(irq
)->vector
);
2308 * Level and edge triggered IO-APIC interrupts need different handling,
2309 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
2310 * handled with the level-triggered descriptor, but that one has slightly
2311 * more overhead. Level-triggered interrupts cannot be handled with the
2312 * edge-triggered handler, without risking IRQ storms and other ugly
2318 #ifdef CONFIG_INTR_REMAP
2319 static void ir_irq_migration(struct work_struct
*work
);
2321 static DECLARE_DELAYED_WORK(ir_migration_work
, ir_irq_migration
);
2324 * Migrate the IO-APIC irq in the presence of intr-remapping.
2326 * For edge triggered, irq migration is a simple atomic update(of vector
2327 * and cpu destination) of IRTE and flush the hardware cache.
2329 * For level triggered, we need to modify the io-apic RTE aswell with the update
2330 * vector information, along with modifying IRTE with vector and destination.
2331 * So irq migration for level triggered is little bit more complex compared to
2332 * edge triggered migration. But the good news is, we use the same algorithm
2333 * for level triggered migration as we have today, only difference being,
2334 * we now initiate the irq migration from process context instead of the
2335 * interrupt context.
2337 * In future, when we do a directed EOI (combined with cpu EOI broadcast
2338 * suppression) to the IO-APIC, level triggered irq migration will also be
2339 * as simple as edge triggered migration and we can do the irq migration
2340 * with a simple atomic update to IO-APIC RTE.
2343 migrate_ioapic_irq_desc(struct irq_desc
*desc
, const struct cpumask
*mask
)
2345 struct irq_cfg
*cfg
;
2347 int modify_ioapic_rte
;
2349 unsigned long flags
;
2352 if (!cpumask_intersects(mask
, cpu_online_mask
))
2356 if (get_irte(irq
, &irte
))
2359 cfg
= desc
->chip_data
;
2360 if (assign_irq_vector(irq
, cfg
, mask
))
2363 set_extra_move_desc(desc
, mask
);
2365 dest
= cpu_mask_to_apicid_and(cfg
->domain
, mask
);
2367 modify_ioapic_rte
= desc
->status
& IRQ_LEVEL
;
2368 if (modify_ioapic_rte
) {
2369 spin_lock_irqsave(&ioapic_lock
, flags
);
2370 __target_IO_APIC_irq(irq
, dest
, cfg
);
2371 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2374 irte
.vector
= cfg
->vector
;
2375 irte
.dest_id
= IRTE_DEST(dest
);
2378 * Modified the IRTE and flushes the Interrupt entry cache.
2380 modify_irte(irq
, &irte
);
2382 if (cfg
->move_in_progress
)
2383 send_cleanup_vector(cfg
);
2385 cpumask_copy(desc
->affinity
, mask
);
2388 static int migrate_irq_remapped_level_desc(struct irq_desc
*desc
)
2391 struct irq_cfg
*cfg
= desc
->chip_data
;
2393 mask_IO_APIC_irq_desc(desc
);
2395 if (io_apic_level_ack_pending(cfg
)) {
2397 * Interrupt in progress. Migrating irq now will change the
2398 * vector information in the IO-APIC RTE and that will confuse
2399 * the EOI broadcast performed by cpu.
2400 * So, delay the irq migration to the next instance.
2402 schedule_delayed_work(&ir_migration_work
, 1);
2406 /* everthing is clear. we have right of way */
2407 migrate_ioapic_irq_desc(desc
, desc
->pending_mask
);
2410 desc
->status
&= ~IRQ_MOVE_PENDING
;
2411 cpumask_clear(desc
->pending_mask
);
2414 unmask_IO_APIC_irq_desc(desc
);
2419 static void ir_irq_migration(struct work_struct
*work
)
2422 struct irq_desc
*desc
;
2424 for_each_irq_desc(irq
, desc
) {
2425 if (desc
->status
& IRQ_MOVE_PENDING
) {
2426 unsigned long flags
;
2428 spin_lock_irqsave(&desc
->lock
, flags
);
2429 if (!desc
->chip
->set_affinity
||
2430 !(desc
->status
& IRQ_MOVE_PENDING
)) {
2431 desc
->status
&= ~IRQ_MOVE_PENDING
;
2432 spin_unlock_irqrestore(&desc
->lock
, flags
);
2436 desc
->chip
->set_affinity(irq
, desc
->pending_mask
);
2437 spin_unlock_irqrestore(&desc
->lock
, flags
);
2443 * Migrates the IRQ destination in the process context.
2445 static void set_ir_ioapic_affinity_irq_desc(struct irq_desc
*desc
,
2446 const struct cpumask
*mask
)
2448 if (desc
->status
& IRQ_LEVEL
) {
2449 desc
->status
|= IRQ_MOVE_PENDING
;
2450 cpumask_copy(desc
->pending_mask
, mask
);
2451 migrate_irq_remapped_level_desc(desc
);
2455 migrate_ioapic_irq_desc(desc
, mask
);
2457 static void set_ir_ioapic_affinity_irq(unsigned int irq
,
2458 const struct cpumask
*mask
)
2460 struct irq_desc
*desc
= irq_to_desc(irq
);
2462 set_ir_ioapic_affinity_irq_desc(desc
, mask
);
2466 asmlinkage
void smp_irq_move_cleanup_interrupt(void)
2468 unsigned vector
, me
;
2474 me
= smp_processor_id();
2475 for (vector
= FIRST_EXTERNAL_VECTOR
; vector
< NR_VECTORS
; vector
++) {
2477 struct irq_desc
*desc
;
2478 struct irq_cfg
*cfg
;
2479 irq
= __get_cpu_var(vector_irq
)[vector
];
2484 desc
= irq_to_desc(irq
);
2489 spin_lock(&desc
->lock
);
2490 if (!cfg
->move_cleanup_count
)
2493 if (vector
== cfg
->vector
&& cpumask_test_cpu(me
, cfg
->domain
))
2496 __get_cpu_var(vector_irq
)[vector
] = -1;
2497 cfg
->move_cleanup_count
--;
2499 spin_unlock(&desc
->lock
);
2505 static void irq_complete_move(struct irq_desc
**descp
)
2507 struct irq_desc
*desc
= *descp
;
2508 struct irq_cfg
*cfg
= desc
->chip_data
;
2509 unsigned vector
, me
;
2511 if (likely(!cfg
->move_in_progress
)) {
2512 #ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
2513 if (likely(!cfg
->move_desc_pending
))
2516 /* domain has not changed, but affinity did */
2517 me
= smp_processor_id();
2518 if (cpumask_test_cpu(me
, desc
->affinity
)) {
2519 *descp
= desc
= move_irq_desc(desc
, me
);
2520 /* get the new one */
2521 cfg
= desc
->chip_data
;
2522 cfg
->move_desc_pending
= 0;
2528 vector
= ~get_irq_regs()->orig_ax
;
2529 me
= smp_processor_id();
2530 #ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
2531 *descp
= desc
= move_irq_desc(desc
, me
);
2532 /* get the new one */
2533 cfg
= desc
->chip_data
;
2536 if (vector
== cfg
->vector
&& cpumask_test_cpu(me
, cfg
->domain
))
2537 send_cleanup_vector(cfg
);
2540 static inline void irq_complete_move(struct irq_desc
**descp
) {}
2543 #ifdef CONFIG_INTR_REMAP
2544 static void ack_x2apic_level(unsigned int irq
)
2549 static void ack_x2apic_edge(unsigned int irq
)
2556 static void ack_apic_edge(unsigned int irq
)
2558 struct irq_desc
*desc
= irq_to_desc(irq
);
2560 irq_complete_move(&desc
);
2561 move_native_irq(irq
);
2565 atomic_t irq_mis_count
;
2567 static void ack_apic_level(unsigned int irq
)
2569 struct irq_desc
*desc
= irq_to_desc(irq
);
2571 #ifdef CONFIG_X86_32
2575 struct irq_cfg
*cfg
;
2576 int do_unmask_irq
= 0;
2578 irq_complete_move(&desc
);
2579 #ifdef CONFIG_GENERIC_PENDING_IRQ
2580 /* If we are moving the irq we need to mask it */
2581 if (unlikely(desc
->status
& IRQ_MOVE_PENDING
)) {
2583 mask_IO_APIC_irq_desc(desc
);
2587 #ifdef CONFIG_X86_32
2589 * It appears there is an erratum which affects at least version 0x11
2590 * of I/O APIC (that's the 82093AA and cores integrated into various
2591 * chipsets). Under certain conditions a level-triggered interrupt is
2592 * erroneously delivered as edge-triggered one but the respective IRR
2593 * bit gets set nevertheless. As a result the I/O unit expects an EOI
2594 * message but it will never arrive and further interrupts are blocked
2595 * from the source. The exact reason is so far unknown, but the
2596 * phenomenon was observed when two consecutive interrupt requests
2597 * from a given source get delivered to the same CPU and the source is
2598 * temporarily disabled in between.
2600 * A workaround is to simulate an EOI message manually. We achieve it
2601 * by setting the trigger mode to edge and then to level when the edge
2602 * trigger mode gets detected in the TMR of a local APIC for a
2603 * level-triggered interrupt. We mask the source for the time of the
2604 * operation to prevent an edge-triggered interrupt escaping meanwhile.
2605 * The idea is from Manfred Spraul. --macro
2607 cfg
= desc
->chip_data
;
2610 v
= apic_read(APIC_TMR
+ ((i
& ~0x1f) >> 1));
2614 * We must acknowledge the irq before we move it or the acknowledge will
2615 * not propagate properly.
2619 /* Now we can move and renable the irq */
2620 if (unlikely(do_unmask_irq
)) {
2621 /* Only migrate the irq if the ack has been received.
2623 * On rare occasions the broadcast level triggered ack gets
2624 * delayed going to ioapics, and if we reprogram the
2625 * vector while Remote IRR is still set the irq will never
2628 * To prevent this scenario we read the Remote IRR bit
2629 * of the ioapic. This has two effects.
2630 * - On any sane system the read of the ioapic will
2631 * flush writes (and acks) going to the ioapic from
2633 * - We get to see if the ACK has actually been delivered.
2635 * Based on failed experiments of reprogramming the
2636 * ioapic entry from outside of irq context starting
2637 * with masking the ioapic entry and then polling until
2638 * Remote IRR was clear before reprogramming the
2639 * ioapic I don't trust the Remote IRR bit to be
2640 * completey accurate.
2642 * However there appears to be no other way to plug
2643 * this race, so if the Remote IRR bit is not
2644 * accurate and is causing problems then it is a hardware bug
2645 * and you can go talk to the chipset vendor about it.
2647 cfg
= desc
->chip_data
;
2648 if (!io_apic_level_ack_pending(cfg
))
2649 move_masked_irq(irq
);
2650 unmask_IO_APIC_irq_desc(desc
);
2653 #ifdef CONFIG_X86_32
2654 if (!(v
& (1 << (i
& 0x1f)))) {
2655 atomic_inc(&irq_mis_count
);
2656 spin_lock(&ioapic_lock
);
2657 __mask_and_edge_IO_APIC_irq(cfg
);
2658 __unmask_and_level_IO_APIC_irq(cfg
);
2659 spin_unlock(&ioapic_lock
);
2664 static struct irq_chip ioapic_chip __read_mostly
= {
2666 .startup
= startup_ioapic_irq
,
2667 .mask
= mask_IO_APIC_irq
,
2668 .unmask
= unmask_IO_APIC_irq
,
2669 .ack
= ack_apic_edge
,
2670 .eoi
= ack_apic_level
,
2672 .set_affinity
= set_ioapic_affinity_irq
,
2674 .retrigger
= ioapic_retrigger_irq
,
2677 #ifdef CONFIG_INTR_REMAP
2678 static struct irq_chip ir_ioapic_chip __read_mostly
= {
2679 .name
= "IR-IO-APIC",
2680 .startup
= startup_ioapic_irq
,
2681 .mask
= mask_IO_APIC_irq
,
2682 .unmask
= unmask_IO_APIC_irq
,
2683 .ack
= ack_x2apic_edge
,
2684 .eoi
= ack_x2apic_level
,
2686 .set_affinity
= set_ir_ioapic_affinity_irq
,
2688 .retrigger
= ioapic_retrigger_irq
,
2692 static inline void init_IO_APIC_traps(void)
2695 struct irq_desc
*desc
;
2696 struct irq_cfg
*cfg
;
2699 * NOTE! The local APIC isn't very good at handling
2700 * multiple interrupts at the same interrupt level.
2701 * As the interrupt level is determined by taking the
2702 * vector number and shifting that right by 4, we
2703 * want to spread these out a bit so that they don't
2704 * all fall in the same interrupt level.
2706 * Also, we've got to be careful not to trash gate
2707 * 0x80, because int 0x80 is hm, kind of importantish. ;)
2709 for_each_irq_desc(irq
, desc
) {
2710 cfg
= desc
->chip_data
;
2711 if (IO_APIC_IRQ(irq
) && cfg
&& !cfg
->vector
) {
2713 * Hmm.. We don't have an entry for this,
2714 * so default to an old-fashioned 8259
2715 * interrupt if we can..
2717 if (irq
< NR_IRQS_LEGACY
)
2718 make_8259A_irq(irq
);
2720 /* Strange. Oh, well.. */
2721 desc
->chip
= &no_irq_chip
;
2727 * The local APIC irq-chip implementation:
2730 static void mask_lapic_irq(unsigned int irq
)
2734 v
= apic_read(APIC_LVT0
);
2735 apic_write(APIC_LVT0
, v
| APIC_LVT_MASKED
);
2738 static void unmask_lapic_irq(unsigned int irq
)
2742 v
= apic_read(APIC_LVT0
);
2743 apic_write(APIC_LVT0
, v
& ~APIC_LVT_MASKED
);
2746 static void ack_lapic_irq(unsigned int irq
)
2751 static struct irq_chip lapic_chip __read_mostly
= {
2752 .name
= "local-APIC",
2753 .mask
= mask_lapic_irq
,
2754 .unmask
= unmask_lapic_irq
,
2755 .ack
= ack_lapic_irq
,
2758 static void lapic_register_intr(int irq
, struct irq_desc
*desc
)
2760 desc
->status
&= ~IRQ_LEVEL
;
2761 set_irq_chip_and_handler_name(irq
, &lapic_chip
, handle_edge_irq
,
2765 static void __init
setup_nmi(void)
2768 * Dirty trick to enable the NMI watchdog ...
2769 * We put the 8259A master into AEOI mode and
2770 * unmask on all local APICs LVT0 as NMI.
2772 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
2773 * is from Maciej W. Rozycki - so we do not have to EOI from
2774 * the NMI handler or the timer interrupt.
2776 apic_printk(APIC_VERBOSE
, KERN_INFO
"activating NMI Watchdog ...");
2778 enable_NMI_through_LVT0();
2780 apic_printk(APIC_VERBOSE
, " done.\n");
2784 * This looks a bit hackish but it's about the only one way of sending
2785 * a few INTA cycles to 8259As and any associated glue logic. ICR does
2786 * not support the ExtINT mode, unfortunately. We need to send these
2787 * cycles as some i82489DX-based boards have glue logic that keeps the
2788 * 8259A interrupt line asserted until INTA. --macro
2790 static inline void __init
unlock_ExtINT_logic(void)
2793 struct IO_APIC_route_entry entry0
, entry1
;
2794 unsigned char save_control
, save_freq_select
;
2796 pin
= find_isa_irq_pin(8, mp_INT
);
2801 apic
= find_isa_irq_apic(8, mp_INT
);
2807 entry0
= ioapic_read_entry(apic
, pin
);
2808 clear_IO_APIC_pin(apic
, pin
);
2810 memset(&entry1
, 0, sizeof(entry1
));
2812 entry1
.dest_mode
= 0; /* physical delivery */
2813 entry1
.mask
= 0; /* unmask IRQ now */
2814 entry1
.dest
= hard_smp_processor_id();
2815 entry1
.delivery_mode
= dest_ExtINT
;
2816 entry1
.polarity
= entry0
.polarity
;
2820 ioapic_write_entry(apic
, pin
, entry1
);
2822 save_control
= CMOS_READ(RTC_CONTROL
);
2823 save_freq_select
= CMOS_READ(RTC_FREQ_SELECT
);
2824 CMOS_WRITE((save_freq_select
& ~RTC_RATE_SELECT
) | 0x6,
2826 CMOS_WRITE(save_control
| RTC_PIE
, RTC_CONTROL
);
2831 if ((CMOS_READ(RTC_INTR_FLAGS
) & RTC_PF
) == RTC_PF
)
2835 CMOS_WRITE(save_control
, RTC_CONTROL
);
2836 CMOS_WRITE(save_freq_select
, RTC_FREQ_SELECT
);
2837 clear_IO_APIC_pin(apic
, pin
);
2839 ioapic_write_entry(apic
, pin
, entry0
);
2842 static int disable_timer_pin_1 __initdata
;
2843 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
2844 static int __init
disable_timer_pin_setup(char *arg
)
2846 disable_timer_pin_1
= 1;
2849 early_param("disable_timer_pin_1", disable_timer_pin_setup
);
2851 int timer_through_8259 __initdata
;
2854 * This code may look a bit paranoid, but it's supposed to cooperate with
2855 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
2856 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
2857 * fanatically on his truly buggy board.
2859 * FIXME: really need to revamp this for all platforms.
2861 static inline void __init
check_timer(void)
2863 struct irq_desc
*desc
= irq_to_desc(0);
2864 struct irq_cfg
*cfg
= desc
->chip_data
;
2865 int cpu
= boot_cpu_id
;
2866 int apic1
, pin1
, apic2
, pin2
;
2867 unsigned long flags
;
2871 local_irq_save(flags
);
2873 ver
= apic_read(APIC_LVR
);
2874 ver
= GET_APIC_VERSION(ver
);
2877 * get/set the timer IRQ vector:
2879 disable_8259A_irq(0);
2880 assign_irq_vector(0, cfg
, TARGET_CPUS
);
2883 * As IRQ0 is to be enabled in the 8259A, the virtual
2884 * wire has to be disabled in the local APIC. Also
2885 * timer interrupts need to be acknowledged manually in
2886 * the 8259A for the i82489DX when using the NMI
2887 * watchdog as that APIC treats NMIs as level-triggered.
2888 * The AEOI mode will finish them in the 8259A
2891 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_EXTINT
);
2893 #ifdef CONFIG_X86_32
2894 timer_ack
= (nmi_watchdog
== NMI_IO_APIC
&& !APIC_INTEGRATED(ver
));
2897 pin1
= find_isa_irq_pin(0, mp_INT
);
2898 apic1
= find_isa_irq_apic(0, mp_INT
);
2899 pin2
= ioapic_i8259
.pin
;
2900 apic2
= ioapic_i8259
.apic
;
2902 apic_printk(APIC_QUIET
, KERN_INFO
"..TIMER: vector=0x%02X "
2903 "apic1=%d pin1=%d apic2=%d pin2=%d\n",
2904 cfg
->vector
, apic1
, pin1
, apic2
, pin2
);
2907 * Some BIOS writers are clueless and report the ExtINTA
2908 * I/O APIC input from the cascaded 8259A as the timer
2909 * interrupt input. So just in case, if only one pin
2910 * was found above, try it both directly and through the
2914 #ifdef CONFIG_INTR_REMAP
2915 if (intr_remapping_enabled
)
2916 panic("BIOS bug: timer not connected to IO-APIC");
2921 } else if (pin2
== -1) {
2928 * Ok, does IRQ0 through the IOAPIC work?
2931 add_pin_to_irq_cpu(cfg
, cpu
, apic1
, pin1
);
2932 setup_timer_IRQ0_pin(apic1
, pin1
, cfg
->vector
);
2934 unmask_IO_APIC_irq_desc(desc
);
2935 if (timer_irq_works()) {
2936 if (nmi_watchdog
== NMI_IO_APIC
) {
2938 enable_8259A_irq(0);
2940 if (disable_timer_pin_1
> 0)
2941 clear_IO_APIC_pin(0, pin1
);
2944 #ifdef CONFIG_INTR_REMAP
2945 if (intr_remapping_enabled
)
2946 panic("timer doesn't work through Interrupt-remapped IO-APIC");
2948 clear_IO_APIC_pin(apic1
, pin1
);
2950 apic_printk(APIC_QUIET
, KERN_ERR
"..MP-BIOS bug: "
2951 "8254 timer not connected to IO-APIC\n");
2953 apic_printk(APIC_QUIET
, KERN_INFO
"...trying to set up timer "
2954 "(IRQ0) through the 8259A ...\n");
2955 apic_printk(APIC_QUIET
, KERN_INFO
2956 "..... (found apic %d pin %d) ...\n", apic2
, pin2
);
2958 * legacy devices should be connected to IO APIC #0
2960 replace_pin_at_irq_cpu(cfg
, cpu
, apic1
, pin1
, apic2
, pin2
);
2961 setup_timer_IRQ0_pin(apic2
, pin2
, cfg
->vector
);
2962 unmask_IO_APIC_irq_desc(desc
);
2963 enable_8259A_irq(0);
2964 if (timer_irq_works()) {
2965 apic_printk(APIC_QUIET
, KERN_INFO
"....... works.\n");
2966 timer_through_8259
= 1;
2967 if (nmi_watchdog
== NMI_IO_APIC
) {
2968 disable_8259A_irq(0);
2970 enable_8259A_irq(0);
2975 * Cleanup, just in case ...
2977 disable_8259A_irq(0);
2978 clear_IO_APIC_pin(apic2
, pin2
);
2979 apic_printk(APIC_QUIET
, KERN_INFO
"....... failed.\n");
2982 if (nmi_watchdog
== NMI_IO_APIC
) {
2983 apic_printk(APIC_QUIET
, KERN_WARNING
"timer doesn't work "
2984 "through the IO-APIC - disabling NMI Watchdog!\n");
2985 nmi_watchdog
= NMI_NONE
;
2987 #ifdef CONFIG_X86_32
2991 apic_printk(APIC_QUIET
, KERN_INFO
2992 "...trying to set up timer as Virtual Wire IRQ...\n");
2994 lapic_register_intr(0, desc
);
2995 apic_write(APIC_LVT0
, APIC_DM_FIXED
| cfg
->vector
); /* Fixed mode */
2996 enable_8259A_irq(0);
2998 if (timer_irq_works()) {
2999 apic_printk(APIC_QUIET
, KERN_INFO
"..... works.\n");
3002 disable_8259A_irq(0);
3003 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_FIXED
| cfg
->vector
);
3004 apic_printk(APIC_QUIET
, KERN_INFO
"..... failed.\n");
3006 apic_printk(APIC_QUIET
, KERN_INFO
3007 "...trying to set up timer as ExtINT IRQ...\n");
3011 apic_write(APIC_LVT0
, APIC_DM_EXTINT
);
3013 unlock_ExtINT_logic();
3015 if (timer_irq_works()) {
3016 apic_printk(APIC_QUIET
, KERN_INFO
"..... works.\n");
3019 apic_printk(APIC_QUIET
, KERN_INFO
"..... failed :(.\n");
3020 panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
3021 "report. Then try booting with the 'noapic' option.\n");
3023 local_irq_restore(flags
);
3027 * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
3028 * to devices. However there may be an I/O APIC pin available for
3029 * this interrupt regardless. The pin may be left unconnected, but
3030 * typically it will be reused as an ExtINT cascade interrupt for
3031 * the master 8259A. In the MPS case such a pin will normally be
3032 * reported as an ExtINT interrupt in the MP table. With ACPI
3033 * there is no provision for ExtINT interrupts, and in the absence
3034 * of an override it would be treated as an ordinary ISA I/O APIC
3035 * interrupt, that is edge-triggered and unmasked by default. We
3036 * used to do this, but it caused problems on some systems because
3037 * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
3038 * the same ExtINT cascade interrupt to drive the local APIC of the
3039 * bootstrap processor. Therefore we refrain from routing IRQ2 to
3040 * the I/O APIC in all cases now. No actual device should request
3041 * it anyway. --macro
3043 #define PIC_IRQS (1 << PIC_CASCADE_IR)
3045 void __init
setup_IO_APIC(void)
3048 #ifdef CONFIG_X86_32
3052 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
3056 io_apic_irqs
= ~PIC_IRQS
;
3058 apic_printk(APIC_VERBOSE
, "ENABLING IO-APIC IRQs\n");
3060 * Set up IO-APIC IRQ routing.
3062 #ifdef CONFIG_X86_32
3064 setup_ioapic_ids_from_mpc();
3067 setup_IO_APIC_irqs();
3068 init_IO_APIC_traps();
3073 * Called after all the initialization is done. If we didnt find any
3074 * APIC bugs then we can allow the modify fast path
3077 static int __init
io_apic_bug_finalize(void)
3079 if (sis_apic_bug
== -1)
3084 late_initcall(io_apic_bug_finalize
);
3086 struct sysfs_ioapic_data
{
3087 struct sys_device dev
;
3088 struct IO_APIC_route_entry entry
[0];
3090 static struct sysfs_ioapic_data
* mp_ioapic_data
[MAX_IO_APICS
];
3092 static int ioapic_suspend(struct sys_device
*dev
, pm_message_t state
)
3094 struct IO_APIC_route_entry
*entry
;
3095 struct sysfs_ioapic_data
*data
;
3098 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
3099 entry
= data
->entry
;
3100 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++, entry
++ )
3101 *entry
= ioapic_read_entry(dev
->id
, i
);
3106 static int ioapic_resume(struct sys_device
*dev
)
3108 struct IO_APIC_route_entry
*entry
;
3109 struct sysfs_ioapic_data
*data
;
3110 unsigned long flags
;
3111 union IO_APIC_reg_00 reg_00
;
3114 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
3115 entry
= data
->entry
;
3117 spin_lock_irqsave(&ioapic_lock
, flags
);
3118 reg_00
.raw
= io_apic_read(dev
->id
, 0);
3119 if (reg_00
.bits
.ID
!= mp_ioapics
[dev
->id
].apicid
) {
3120 reg_00
.bits
.ID
= mp_ioapics
[dev
->id
].apicid
;
3121 io_apic_write(dev
->id
, 0, reg_00
.raw
);
3123 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3124 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++)
3125 ioapic_write_entry(dev
->id
, i
, entry
[i
]);
3130 static struct sysdev_class ioapic_sysdev_class
= {
3132 .suspend
= ioapic_suspend
,
3133 .resume
= ioapic_resume
,
3136 static int __init
ioapic_init_sysfs(void)
3138 struct sys_device
* dev
;
3141 error
= sysdev_class_register(&ioapic_sysdev_class
);
3145 for (i
= 0; i
< nr_ioapics
; i
++ ) {
3146 size
= sizeof(struct sys_device
) + nr_ioapic_registers
[i
]
3147 * sizeof(struct IO_APIC_route_entry
);
3148 mp_ioapic_data
[i
] = kzalloc(size
, GFP_KERNEL
);
3149 if (!mp_ioapic_data
[i
]) {
3150 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
3153 dev
= &mp_ioapic_data
[i
]->dev
;
3155 dev
->cls
= &ioapic_sysdev_class
;
3156 error
= sysdev_register(dev
);
3158 kfree(mp_ioapic_data
[i
]);
3159 mp_ioapic_data
[i
] = NULL
;
3160 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
3168 device_initcall(ioapic_init_sysfs
);
3171 * Dynamic irq allocate and deallocation
3173 unsigned int create_irq_nr(unsigned int irq_want
)
3175 /* Allocate an unused irq */
3178 unsigned long flags
;
3179 struct irq_cfg
*cfg_new
= NULL
;
3180 int cpu
= boot_cpu_id
;
3181 struct irq_desc
*desc_new
= NULL
;
3184 spin_lock_irqsave(&vector_lock
, flags
);
3185 for (new = irq_want
; new < nr_irqs
; new++) {
3186 if (platform_legacy_irq(new))
3189 desc_new
= irq_to_desc_alloc_cpu(new, cpu
);
3191 printk(KERN_INFO
"can not get irq_desc for %d\n", new);
3194 cfg_new
= desc_new
->chip_data
;
3196 if (cfg_new
->vector
!= 0)
3198 if (__assign_irq_vector(new, cfg_new
, TARGET_CPUS
) == 0)
3202 spin_unlock_irqrestore(&vector_lock
, flags
);
3205 dynamic_irq_init(irq
);
3206 /* restore it, in case dynamic_irq_init clear it */
3208 desc_new
->chip_data
= cfg_new
;
3213 static int nr_irqs_gsi
= NR_IRQS_LEGACY
;
3214 int create_irq(void)
3216 unsigned int irq_want
;
3219 irq_want
= nr_irqs_gsi
;
3220 irq
= create_irq_nr(irq_want
);
3228 void destroy_irq(unsigned int irq
)
3230 unsigned long flags
;
3231 struct irq_cfg
*cfg
;
3232 struct irq_desc
*desc
;
3234 /* store it, in case dynamic_irq_cleanup clear it */
3235 desc
= irq_to_desc(irq
);
3236 cfg
= desc
->chip_data
;
3237 dynamic_irq_cleanup(irq
);
3238 /* connect back irq_cfg */
3240 desc
->chip_data
= cfg
;
3242 #ifdef CONFIG_INTR_REMAP
3245 spin_lock_irqsave(&vector_lock
, flags
);
3246 __clear_irq_vector(irq
, cfg
);
3247 spin_unlock_irqrestore(&vector_lock
, flags
);
3251 * MSI message composition
3253 #ifdef CONFIG_PCI_MSI
3254 static int msi_compose_msg(struct pci_dev
*pdev
, unsigned int irq
, struct msi_msg
*msg
)
3256 struct irq_cfg
*cfg
;
3264 err
= assign_irq_vector(irq
, cfg
, TARGET_CPUS
);
3268 dest
= cpu_mask_to_apicid_and(cfg
->domain
, TARGET_CPUS
);
3270 #ifdef CONFIG_INTR_REMAP
3271 if (irq_remapped(irq
)) {
3276 ir_index
= map_irq_to_irte_handle(irq
, &sub_handle
);
3277 BUG_ON(ir_index
== -1);
3279 memset (&irte
, 0, sizeof(irte
));
3282 irte
.dst_mode
= INT_DEST_MODE
;
3283 irte
.trigger_mode
= 0; /* edge */
3284 irte
.dlvry_mode
= INT_DELIVERY_MODE
;
3285 irte
.vector
= cfg
->vector
;
3286 irte
.dest_id
= IRTE_DEST(dest
);
3288 modify_irte(irq
, &irte
);
3290 msg
->address_hi
= MSI_ADDR_BASE_HI
;
3291 msg
->data
= sub_handle
;
3292 msg
->address_lo
= MSI_ADDR_BASE_LO
| MSI_ADDR_IR_EXT_INT
|
3294 MSI_ADDR_IR_INDEX1(ir_index
) |
3295 MSI_ADDR_IR_INDEX2(ir_index
);
3299 msg
->address_hi
= MSI_ADDR_BASE_HI
;
3302 ((INT_DEST_MODE
== 0) ?
3303 MSI_ADDR_DEST_MODE_PHYSICAL
:
3304 MSI_ADDR_DEST_MODE_LOGICAL
) |
3305 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
3306 MSI_ADDR_REDIRECTION_CPU
:
3307 MSI_ADDR_REDIRECTION_LOWPRI
) |
3308 MSI_ADDR_DEST_ID(dest
);
3311 MSI_DATA_TRIGGER_EDGE
|
3312 MSI_DATA_LEVEL_ASSERT
|
3313 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
3314 MSI_DATA_DELIVERY_FIXED
:
3315 MSI_DATA_DELIVERY_LOWPRI
) |
3316 MSI_DATA_VECTOR(cfg
->vector
);
3322 static void set_msi_irq_affinity(unsigned int irq
, const struct cpumask
*mask
)
3324 struct irq_desc
*desc
= irq_to_desc(irq
);
3325 struct irq_cfg
*cfg
;
3329 dest
= set_desc_affinity(desc
, mask
);
3330 if (dest
== BAD_APICID
)
3333 cfg
= desc
->chip_data
;
3335 read_msi_msg_desc(desc
, &msg
);
3337 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
3338 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
3339 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
3340 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
3342 write_msi_msg_desc(desc
, &msg
);
3344 #ifdef CONFIG_INTR_REMAP
3346 * Migrate the MSI irq to another cpumask. This migration is
3347 * done in the process context using interrupt-remapping hardware.
3350 ir_set_msi_irq_affinity(unsigned int irq
, const struct cpumask
*mask
)
3352 struct irq_desc
*desc
= irq_to_desc(irq
);
3353 struct irq_cfg
*cfg
= desc
->chip_data
;
3357 if (get_irte(irq
, &irte
))
3360 dest
= set_desc_affinity(desc
, mask
);
3361 if (dest
== BAD_APICID
)
3364 irte
.vector
= cfg
->vector
;
3365 irte
.dest_id
= IRTE_DEST(dest
);
3368 * atomically update the IRTE with the new destination and vector.
3370 modify_irte(irq
, &irte
);
3373 * After this point, all the interrupts will start arriving
3374 * at the new destination. So, time to cleanup the previous
3375 * vector allocation.
3377 if (cfg
->move_in_progress
)
3378 send_cleanup_vector(cfg
);
3382 #endif /* CONFIG_SMP */
3385 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
3386 * which implement the MSI or MSI-X Capability Structure.
3388 static struct irq_chip msi_chip
= {
3390 .unmask
= unmask_msi_irq
,
3391 .mask
= mask_msi_irq
,
3392 .ack
= ack_apic_edge
,
3394 .set_affinity
= set_msi_irq_affinity
,
3396 .retrigger
= ioapic_retrigger_irq
,
3399 #ifdef CONFIG_INTR_REMAP
3400 static struct irq_chip msi_ir_chip
= {
3401 .name
= "IR-PCI-MSI",
3402 .unmask
= unmask_msi_irq
,
3403 .mask
= mask_msi_irq
,
3404 .ack
= ack_x2apic_edge
,
3406 .set_affinity
= ir_set_msi_irq_affinity
,
3408 .retrigger
= ioapic_retrigger_irq
,
3412 * Map the PCI dev to the corresponding remapping hardware unit
3413 * and allocate 'nvec' consecutive interrupt-remapping table entries
3416 static int msi_alloc_irte(struct pci_dev
*dev
, int irq
, int nvec
)
3418 struct intel_iommu
*iommu
;
3421 iommu
= map_dev_to_ir(dev
);
3424 "Unable to map PCI %s to iommu\n", pci_name(dev
));
3428 index
= alloc_irte(iommu
, irq
, nvec
);
3431 "Unable to allocate %d IRTE for PCI %s\n", nvec
,
3439 static int setup_msi_irq(struct pci_dev
*dev
, struct msi_desc
*msidesc
, int irq
)
3444 ret
= msi_compose_msg(dev
, irq
, &msg
);
3448 set_irq_msi(irq
, msidesc
);
3449 write_msi_msg(irq
, &msg
);
3451 #ifdef CONFIG_INTR_REMAP
3452 if (irq_remapped(irq
)) {
3453 struct irq_desc
*desc
= irq_to_desc(irq
);
3455 * irq migration in process context
3457 desc
->status
|= IRQ_MOVE_PCNTXT
;
3458 set_irq_chip_and_handler_name(irq
, &msi_ir_chip
, handle_edge_irq
, "edge");
3461 set_irq_chip_and_handler_name(irq
, &msi_chip
, handle_edge_irq
, "edge");
3463 dev_printk(KERN_DEBUG
, &dev
->dev
, "irq %d for MSI/MSI-X\n", irq
);
3468 int arch_setup_msi_irq(struct pci_dev
*dev
, struct msi_desc
*msidesc
)
3472 unsigned int irq_want
;
3474 irq_want
= nr_irqs_gsi
;
3475 irq
= create_irq_nr(irq_want
);
3479 #ifdef CONFIG_INTR_REMAP
3480 if (!intr_remapping_enabled
)
3483 ret
= msi_alloc_irte(dev
, irq
, 1);
3488 ret
= setup_msi_irq(dev
, msidesc
, irq
);
3495 #ifdef CONFIG_INTR_REMAP
3502 int arch_setup_msi_irqs(struct pci_dev
*dev
, int nvec
, int type
)
3505 int ret
, sub_handle
;
3506 struct msi_desc
*msidesc
;
3507 unsigned int irq_want
;
3509 #ifdef CONFIG_INTR_REMAP
3510 struct intel_iommu
*iommu
= 0;
3514 irq_want
= nr_irqs_gsi
;
3516 list_for_each_entry(msidesc
, &dev
->msi_list
, list
) {
3517 irq
= create_irq_nr(irq_want
);
3521 #ifdef CONFIG_INTR_REMAP
3522 if (!intr_remapping_enabled
)
3527 * allocate the consecutive block of IRTE's
3530 index
= msi_alloc_irte(dev
, irq
, nvec
);
3536 iommu
= map_dev_to_ir(dev
);
3542 * setup the mapping between the irq and the IRTE
3543 * base index, the sub_handle pointing to the
3544 * appropriate interrupt remap table entry.
3546 set_irte_irq(irq
, iommu
, index
, sub_handle
);
3550 ret
= setup_msi_irq(dev
, msidesc
, irq
);
3562 void arch_teardown_msi_irq(unsigned int irq
)
3569 static void dmar_msi_set_affinity(unsigned int irq
, const struct cpumask
*mask
)
3571 struct irq_desc
*desc
= irq_to_desc(irq
);
3572 struct irq_cfg
*cfg
;
3576 dest
= set_desc_affinity(desc
, mask
);
3577 if (dest
== BAD_APICID
)
3580 cfg
= desc
->chip_data
;
3582 dmar_msi_read(irq
, &msg
);
3584 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
3585 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
3586 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
3587 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
3589 dmar_msi_write(irq
, &msg
);
3592 #endif /* CONFIG_SMP */
3594 struct irq_chip dmar_msi_type
= {
3596 .unmask
= dmar_msi_unmask
,
3597 .mask
= dmar_msi_mask
,
3598 .ack
= ack_apic_edge
,
3600 .set_affinity
= dmar_msi_set_affinity
,
3602 .retrigger
= ioapic_retrigger_irq
,
3605 int arch_setup_dmar_msi(unsigned int irq
)
3610 ret
= msi_compose_msg(NULL
, irq
, &msg
);
3613 dmar_msi_write(irq
, &msg
);
3614 set_irq_chip_and_handler_name(irq
, &dmar_msi_type
, handle_edge_irq
,
3620 #ifdef CONFIG_HPET_TIMER
3623 static void hpet_msi_set_affinity(unsigned int irq
, const struct cpumask
*mask
)
3625 struct irq_desc
*desc
= irq_to_desc(irq
);
3626 struct irq_cfg
*cfg
;
3630 dest
= set_desc_affinity(desc
, mask
);
3631 if (dest
== BAD_APICID
)
3634 cfg
= desc
->chip_data
;
3636 hpet_msi_read(irq
, &msg
);
3638 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
3639 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
3640 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
3641 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
3643 hpet_msi_write(irq
, &msg
);
3646 #endif /* CONFIG_SMP */
3648 struct irq_chip hpet_msi_type
= {
3650 .unmask
= hpet_msi_unmask
,
3651 .mask
= hpet_msi_mask
,
3652 .ack
= ack_apic_edge
,
3654 .set_affinity
= hpet_msi_set_affinity
,
3656 .retrigger
= ioapic_retrigger_irq
,
3659 int arch_setup_hpet_msi(unsigned int irq
)
3664 ret
= msi_compose_msg(NULL
, irq
, &msg
);
3668 hpet_msi_write(irq
, &msg
);
3669 set_irq_chip_and_handler_name(irq
, &hpet_msi_type
, handle_edge_irq
,
3676 #endif /* CONFIG_PCI_MSI */
3678 * Hypertransport interrupt support
3680 #ifdef CONFIG_HT_IRQ
3684 static void target_ht_irq(unsigned int irq
, unsigned int dest
, u8 vector
)
3686 struct ht_irq_msg msg
;
3687 fetch_ht_irq_msg(irq
, &msg
);
3689 msg
.address_lo
&= ~(HT_IRQ_LOW_VECTOR_MASK
| HT_IRQ_LOW_DEST_ID_MASK
);
3690 msg
.address_hi
&= ~(HT_IRQ_HIGH_DEST_ID_MASK
);
3692 msg
.address_lo
|= HT_IRQ_LOW_VECTOR(vector
) | HT_IRQ_LOW_DEST_ID(dest
);
3693 msg
.address_hi
|= HT_IRQ_HIGH_DEST_ID(dest
);
3695 write_ht_irq_msg(irq
, &msg
);
3698 static void set_ht_irq_affinity(unsigned int irq
, const struct cpumask
*mask
)
3700 struct irq_desc
*desc
= irq_to_desc(irq
);
3701 struct irq_cfg
*cfg
;
3704 dest
= set_desc_affinity(desc
, mask
);
3705 if (dest
== BAD_APICID
)
3708 cfg
= desc
->chip_data
;
3710 target_ht_irq(irq
, dest
, cfg
->vector
);
3715 static struct irq_chip ht_irq_chip
= {
3717 .mask
= mask_ht_irq
,
3718 .unmask
= unmask_ht_irq
,
3719 .ack
= ack_apic_edge
,
3721 .set_affinity
= set_ht_irq_affinity
,
3723 .retrigger
= ioapic_retrigger_irq
,
3726 int arch_setup_ht_irq(unsigned int irq
, struct pci_dev
*dev
)
3728 struct irq_cfg
*cfg
;
3735 err
= assign_irq_vector(irq
, cfg
, TARGET_CPUS
);
3737 struct ht_irq_msg msg
;
3740 dest
= cpu_mask_to_apicid_and(cfg
->domain
, TARGET_CPUS
);
3742 msg
.address_hi
= HT_IRQ_HIGH_DEST_ID(dest
);
3746 HT_IRQ_LOW_DEST_ID(dest
) |
3747 HT_IRQ_LOW_VECTOR(cfg
->vector
) |
3748 ((INT_DEST_MODE
== 0) ?
3749 HT_IRQ_LOW_DM_PHYSICAL
:
3750 HT_IRQ_LOW_DM_LOGICAL
) |
3751 HT_IRQ_LOW_RQEOI_EDGE
|
3752 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
3753 HT_IRQ_LOW_MT_FIXED
:
3754 HT_IRQ_LOW_MT_ARBITRATED
) |
3755 HT_IRQ_LOW_IRQ_MASKED
;
3757 write_ht_irq_msg(irq
, &msg
);
3759 set_irq_chip_and_handler_name(irq
, &ht_irq_chip
,
3760 handle_edge_irq
, "edge");
3762 dev_printk(KERN_DEBUG
, &dev
->dev
, "irq %d for HT\n", irq
);
3766 #endif /* CONFIG_HT_IRQ */
3768 #ifdef CONFIG_X86_64
3770 * Re-target the irq to the specified CPU and enable the specified MMR located
3771 * on the specified blade to allow the sending of MSIs to the specified CPU.
3773 int arch_enable_uv_irq(char *irq_name
, unsigned int irq
, int cpu
, int mmr_blade
,
3774 unsigned long mmr_offset
)
3776 const struct cpumask
*eligible_cpu
= cpumask_of(cpu
);
3777 struct irq_cfg
*cfg
;
3779 unsigned long mmr_value
;
3780 struct uv_IO_APIC_route_entry
*entry
;
3781 unsigned long flags
;
3786 err
= assign_irq_vector(irq
, cfg
, eligible_cpu
);
3790 spin_lock_irqsave(&vector_lock
, flags
);
3791 set_irq_chip_and_handler_name(irq
, &uv_irq_chip
, handle_percpu_irq
,
3793 spin_unlock_irqrestore(&vector_lock
, flags
);
3796 entry
= (struct uv_IO_APIC_route_entry
*)&mmr_value
;
3797 BUG_ON(sizeof(struct uv_IO_APIC_route_entry
) != sizeof(unsigned long));
3799 entry
->vector
= cfg
->vector
;
3800 entry
->delivery_mode
= INT_DELIVERY_MODE
;
3801 entry
->dest_mode
= INT_DEST_MODE
;
3802 entry
->polarity
= 0;
3805 entry
->dest
= cpu_mask_to_apicid(eligible_cpu
);
3807 mmr_pnode
= uv_blade_to_pnode(mmr_blade
);
3808 uv_write_global_mmr64(mmr_pnode
, mmr_offset
, mmr_value
);
3814 * Disable the specified MMR located on the specified blade so that MSIs are
3815 * longer allowed to be sent.
3817 void arch_disable_uv_irq(int mmr_blade
, unsigned long mmr_offset
)
3819 unsigned long mmr_value
;
3820 struct uv_IO_APIC_route_entry
*entry
;
3824 entry
= (struct uv_IO_APIC_route_entry
*)&mmr_value
;
3825 BUG_ON(sizeof(struct uv_IO_APIC_route_entry
) != sizeof(unsigned long));
3829 mmr_pnode
= uv_blade_to_pnode(mmr_blade
);
3830 uv_write_global_mmr64(mmr_pnode
, mmr_offset
, mmr_value
);
3832 #endif /* CONFIG_X86_64 */
3834 int __init
io_apic_get_redir_entries (int ioapic
)
3836 union IO_APIC_reg_01 reg_01
;
3837 unsigned long flags
;
3839 spin_lock_irqsave(&ioapic_lock
, flags
);
3840 reg_01
.raw
= io_apic_read(ioapic
, 1);
3841 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3843 return reg_01
.bits
.entries
;
3846 void __init
probe_nr_irqs_gsi(void)
3851 for (idx
= 0; idx
< nr_ioapics
; idx
++)
3852 nr
+= io_apic_get_redir_entries(idx
) + 1;
3854 if (nr
> nr_irqs_gsi
)
3858 #ifdef CONFIG_SPARSE_IRQ
3859 int __init
arch_probe_nr_irqs(void)
3863 nr
= ((8 * nr_cpu_ids
) > (32 * nr_ioapics
) ?
3864 (NR_VECTORS
+ (8 * nr_cpu_ids
)) :
3865 (NR_VECTORS
+ (32 * nr_ioapics
)));
3867 if (nr
< nr_irqs
&& nr
> nr_irqs_gsi
)
3874 /* --------------------------------------------------------------------------
3875 ACPI-based IOAPIC Configuration
3876 -------------------------------------------------------------------------- */
3880 #ifdef CONFIG_X86_32
3881 int __init
io_apic_get_unique_id(int ioapic
, int apic_id
)
3883 union IO_APIC_reg_00 reg_00
;
3884 static physid_mask_t apic_id_map
= PHYSID_MASK_NONE
;
3886 unsigned long flags
;
3890 * The P4 platform supports up to 256 APIC IDs on two separate APIC
3891 * buses (one for LAPICs, one for IOAPICs), where predecessors only
3892 * supports up to 16 on one shared APIC bus.
3894 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
3895 * advantage of new APIC bus architecture.
3898 if (physids_empty(apic_id_map
))
3899 apic_id_map
= ioapic_phys_id_map(phys_cpu_present_map
);
3901 spin_lock_irqsave(&ioapic_lock
, flags
);
3902 reg_00
.raw
= io_apic_read(ioapic
, 0);
3903 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3905 if (apic_id
>= get_physical_broadcast()) {
3906 printk(KERN_WARNING
"IOAPIC[%d]: Invalid apic_id %d, trying "
3907 "%d\n", ioapic
, apic_id
, reg_00
.bits
.ID
);
3908 apic_id
= reg_00
.bits
.ID
;
3912 * Every APIC in a system must have a unique ID or we get lots of nice
3913 * 'stuck on smp_invalidate_needed IPI wait' messages.
3915 if (check_apicid_used(apic_id_map
, apic_id
)) {
3917 for (i
= 0; i
< get_physical_broadcast(); i
++) {
3918 if (!check_apicid_used(apic_id_map
, i
))
3922 if (i
== get_physical_broadcast())
3923 panic("Max apic_id exceeded!\n");
3925 printk(KERN_WARNING
"IOAPIC[%d]: apic_id %d already used, "
3926 "trying %d\n", ioapic
, apic_id
, i
);
3931 tmp
= apicid_to_cpu_present(apic_id
);
3932 physids_or(apic_id_map
, apic_id_map
, tmp
);
3934 if (reg_00
.bits
.ID
!= apic_id
) {
3935 reg_00
.bits
.ID
= apic_id
;
3937 spin_lock_irqsave(&ioapic_lock
, flags
);
3938 io_apic_write(ioapic
, 0, reg_00
.raw
);
3939 reg_00
.raw
= io_apic_read(ioapic
, 0);
3940 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3943 if (reg_00
.bits
.ID
!= apic_id
) {
3944 printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic
);
3949 apic_printk(APIC_VERBOSE
, KERN_INFO
3950 "IOAPIC[%d]: Assigned apic_id %d\n", ioapic
, apic_id
);
3955 int __init
io_apic_get_version(int ioapic
)
3957 union IO_APIC_reg_01 reg_01
;
3958 unsigned long flags
;
3960 spin_lock_irqsave(&ioapic_lock
, flags
);
3961 reg_01
.raw
= io_apic_read(ioapic
, 1);
3962 spin_unlock_irqrestore(&ioapic_lock
, flags
);
3964 return reg_01
.bits
.version
;
3968 int io_apic_set_pci_routing (int ioapic
, int pin
, int irq
, int triggering
, int polarity
)
3970 struct irq_desc
*desc
;
3971 struct irq_cfg
*cfg
;
3972 int cpu
= boot_cpu_id
;
3974 if (!IO_APIC_IRQ(irq
)) {
3975 apic_printk(APIC_QUIET
,KERN_ERR
"IOAPIC[%d]: Invalid reference to IRQ 0\n",
3980 desc
= irq_to_desc_alloc_cpu(irq
, cpu
);
3982 printk(KERN_INFO
"can not get irq_desc %d\n", irq
);
3987 * IRQs < 16 are already in the irq_2_pin[] map
3989 if (irq
>= NR_IRQS_LEGACY
) {
3990 cfg
= desc
->chip_data
;
3991 add_pin_to_irq_cpu(cfg
, cpu
, ioapic
, pin
);
3994 setup_IO_APIC_irq(ioapic
, pin
, irq
, desc
, triggering
, polarity
);
4000 int acpi_get_override_irq(int bus_irq
, int *trigger
, int *polarity
)
4004 if (skip_ioapic_setup
)
4007 for (i
= 0; i
< mp_irq_entries
; i
++)
4008 if (mp_irqs
[i
].irqtype
== mp_INT
&&
4009 mp_irqs
[i
].srcbusirq
== bus_irq
)
4011 if (i
>= mp_irq_entries
)
4014 *trigger
= irq_trigger(i
);
4015 *polarity
= irq_polarity(i
);
4019 #endif /* CONFIG_ACPI */
4022 * This function currently is only a helper for the i386 smp boot process where
4023 * we need to reprogram the ioredtbls to cater for the cpus which have come online
4024 * so mask in all cases should simply be TARGET_CPUS
4027 void __init
setup_ioapic_dest(void)
4029 int pin
, ioapic
, irq
, irq_entry
;
4030 struct irq_desc
*desc
;
4031 struct irq_cfg
*cfg
;
4032 const struct cpumask
*mask
;
4034 if (skip_ioapic_setup
== 1)
4037 for (ioapic
= 0; ioapic
< nr_ioapics
; ioapic
++) {
4038 for (pin
= 0; pin
< nr_ioapic_registers
[ioapic
]; pin
++) {
4039 irq_entry
= find_irq_entry(ioapic
, pin
, mp_INT
);
4040 if (irq_entry
== -1)
4042 irq
= pin_2_irq(irq_entry
, ioapic
, pin
);
4044 /* setup_IO_APIC_irqs could fail to get vector for some device
4045 * when you have too many devices, because at that time only boot
4048 desc
= irq_to_desc(irq
);
4049 cfg
= desc
->chip_data
;
4051 setup_IO_APIC_irq(ioapic
, pin
, irq
, desc
,
4052 irq_trigger(irq_entry
),
4053 irq_polarity(irq_entry
));
4059 * Honour affinities which have been set in early boot
4062 (IRQ_NO_BALANCING
| IRQ_AFFINITY_SET
))
4063 mask
= desc
->affinity
;
4067 #ifdef CONFIG_INTR_REMAP
4068 if (intr_remapping_enabled
)
4069 set_ir_ioapic_affinity_irq_desc(desc
, mask
);
4072 set_ioapic_affinity_irq_desc(desc
, mask
);
4079 #define IOAPIC_RESOURCE_NAME_SIZE 11
4081 static struct resource
*ioapic_resources
;
4083 static struct resource
* __init
ioapic_setup_resources(void)
4086 struct resource
*res
;
4090 if (nr_ioapics
<= 0)
4093 n
= IOAPIC_RESOURCE_NAME_SIZE
+ sizeof(struct resource
);
4096 mem
= alloc_bootmem(n
);
4100 mem
+= sizeof(struct resource
) * nr_ioapics
;
4102 for (i
= 0; i
< nr_ioapics
; i
++) {
4104 res
[i
].flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
4105 sprintf(mem
, "IOAPIC %u", i
);
4106 mem
+= IOAPIC_RESOURCE_NAME_SIZE
;
4110 ioapic_resources
= res
;
4115 void __init
ioapic_init_mappings(void)
4117 unsigned long ioapic_phys
, idx
= FIX_IO_APIC_BASE_0
;
4118 struct resource
*ioapic_res
;
4121 ioapic_res
= ioapic_setup_resources();
4122 for (i
= 0; i
< nr_ioapics
; i
++) {
4123 if (smp_found_config
) {
4124 ioapic_phys
= mp_ioapics
[i
].apicaddr
;
4125 #ifdef CONFIG_X86_32
4128 "WARNING: bogus zero IO-APIC "
4129 "address found in MPTABLE, "
4130 "disabling IO/APIC support!\n");
4131 smp_found_config
= 0;
4132 skip_ioapic_setup
= 1;
4133 goto fake_ioapic_page
;
4137 #ifdef CONFIG_X86_32
4140 ioapic_phys
= (unsigned long)
4141 alloc_bootmem_pages(PAGE_SIZE
);
4142 ioapic_phys
= __pa(ioapic_phys
);
4144 set_fixmap_nocache(idx
, ioapic_phys
);
4145 apic_printk(APIC_VERBOSE
,
4146 "mapped IOAPIC to %08lx (%08lx)\n",
4147 __fix_to_virt(idx
), ioapic_phys
);
4150 if (ioapic_res
!= NULL
) {
4151 ioapic_res
->start
= ioapic_phys
;
4152 ioapic_res
->end
= ioapic_phys
+ (4 * 1024) - 1;
4158 static int __init
ioapic_insert_resources(void)
4161 struct resource
*r
= ioapic_resources
;
4165 "IO APIC resources could be not be allocated.\n");
4169 for (i
= 0; i
< nr_ioapics
; i
++) {
4170 insert_resource(&iomem_resource
, r
);
4177 /* Insert the IO APIC resources after PCI initialization has occured to handle
4178 * IO APICS that are mapped in on a BAR in PCI space. */
4179 late_initcall(ioapic_insert_resources
);