2 * Derived from arch/i386/kernel/irq.c
3 * Copyright (C) 1992 Linus Torvalds
4 * Adapted from arch/i386 by Gary Thomas
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Updated and modified by Cort Dougan <cort@fsmlabs.com>
7 * Copyright (C) 1996-2001 Cort Dougan
8 * Adapted for Power Macintosh by Paul Mackerras
9 * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
16 * This file contains the code used by various IRQ handling routines:
17 * asking for different IRQ's should be done through these routines
18 * instead of just grabbing them. Thus setups with different IRQ numbers
19 * shouldn't result in any weird surprises, and installing new handlers
22 * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the
23 * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit
24 * mask register (of which only 16 are defined), hence the weird shifting
25 * and complement of the cached_irq_mask. I want to be able to stuff
26 * this right into the SIU SMASK register.
27 * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
28 * to reduce code space and undefined function references.
33 #include <linux/module.h>
34 #include <linux/threads.h>
35 #include <linux/kernel_stat.h>
36 #include <linux/signal.h>
37 #include <linux/sched.h>
38 #include <linux/ptrace.h>
39 #include <linux/ioport.h>
40 #include <linux/interrupt.h>
41 #include <linux/timex.h>
42 #include <linux/init.h>
43 #include <linux/slab.h>
44 #include <linux/delay.h>
45 #include <linux/irq.h>
46 #include <linux/seq_file.h>
47 #include <linux/cpumask.h>
48 #include <linux/profile.h>
49 #include <linux/bitops.h>
50 #include <linux/list.h>
51 #include <linux/radix-tree.h>
52 #include <linux/mutex.h>
53 #include <linux/bootmem.h>
54 #include <linux/pci.h>
56 #include <asm/uaccess.h>
57 #include <asm/system.h>
59 #include <asm/pgtable.h>
61 #include <asm/cache.h>
63 #include <asm/ptrace.h>
64 #include <asm/machdep.h>
68 #include <asm/firmware.h>
69 #include <asm/lv1call.h>
72 int __irq_offset_value
;
73 static int ppc_spurious_interrupts
;
76 EXPORT_SYMBOL(__irq_offset_value
);
77 atomic_t ppc_n_lost_interrupts
;
79 #ifndef CONFIG_PPC_MERGE
80 #define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
81 unsigned long ppc_cached_irq_mask
[NR_MASK_WORDS
];
85 extern int tau_initialized
;
86 extern int tau_interrupts(int);
88 #endif /* CONFIG_PPC32 */
90 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
91 extern atomic_t ipi_recv
;
92 extern atomic_t ipi_sent
;
96 EXPORT_SYMBOL(irq_desc
);
98 int distribute_irqs
= 1;
100 static inline unsigned long get_hard_enabled(void)
102 unsigned long enabled
;
104 __asm__
__volatile__("lbz %0,%1(13)"
105 : "=r" (enabled
) : "i" (offsetof(struct paca_struct
, hard_enabled
)));
110 static inline void set_soft_enabled(unsigned long enable
)
112 __asm__
__volatile__("stb %0,%1(13)"
113 : : "r" (enable
), "i" (offsetof(struct paca_struct
, soft_enabled
)));
116 void local_irq_restore(unsigned long en
)
119 * get_paca()->soft_enabled = en;
120 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
121 * That was allowed before, and in such a case we do need to take care
122 * that gcc will set soft_enabled directly via r13, not choose to use
123 * an intermediate register, lest we're preempted to a different cpu.
125 set_soft_enabled(en
);
129 if (firmware_has_feature(FW_FEATURE_ISERIES
)) {
131 * Do we need to disable preemption here? Not really: in the
132 * unlikely event that we're preempted to a different cpu in
133 * between getting r13, loading its lppaca_ptr, and loading
134 * its any_int, we might call iseries_handle_interrupts without
135 * an interrupt pending on the new cpu, but that's no disaster,
136 * is it? And the business of preempting us off the old cpu
137 * would itself involve a local_irq_restore which handles the
138 * interrupt to that cpu.
140 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
141 * to avoid any preemption checking added into get_paca().
143 if (local_paca
->lppaca_ptr
->int_dword
.any_int
)
144 iseries_handle_interrupts();
149 * if (get_paca()->hard_enabled) return;
150 * But again we need to take care that gcc gets hard_enabled directly
151 * via r13, not choose to use an intermediate register, lest we're
152 * preempted to a different cpu in between the two instructions.
154 if (get_hard_enabled())
158 * Need to hard-enable interrupts here. Since currently disabled,
159 * no need to take further asm precautions against preemption; but
160 * use local_paca instead of get_paca() to avoid preemption checking.
162 local_paca
->hard_enabled
= en
;
163 if ((int)mfspr(SPRN_DEC
) < 0)
167 * Force the delivery of pending soft-disabled interrupts on PS3.
168 * Any HV call will have this side effect.
170 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
172 lv1_get_version_info(&tmp
);
177 #endif /* CONFIG_PPC64 */
179 int show_interrupts(struct seq_file
*p
, void *v
)
181 int i
= *(loff_t
*)v
, j
;
182 struct irqaction
*action
;
188 for_each_online_cpu(j
)
189 seq_printf(p
, "CPU%d ", j
);
194 desc
= get_irq_desc(i
);
195 spin_lock_irqsave(&desc
->lock
, flags
);
196 action
= desc
->action
;
197 if (!action
|| !action
->handler
)
199 seq_printf(p
, "%3d: ", i
);
201 for_each_online_cpu(j
)
202 seq_printf(p
, "%10u ", kstat_cpu(j
).irqs
[i
]);
204 seq_printf(p
, "%10u ", kstat_irqs(i
));
205 #endif /* CONFIG_SMP */
207 seq_printf(p
, " %s ", desc
->chip
->typename
);
209 seq_puts(p
, " None ");
210 seq_printf(p
, "%s", (desc
->status
& IRQ_LEVEL
) ? "Level " : "Edge ");
211 seq_printf(p
, " %s", action
->name
);
212 for (action
= action
->next
; action
; action
= action
->next
)
213 seq_printf(p
, ", %s", action
->name
);
216 spin_unlock_irqrestore(&desc
->lock
, flags
);
217 } else if (i
== NR_IRQS
) {
219 #ifdef CONFIG_TAU_INT
220 if (tau_initialized
){
221 seq_puts(p
, "TAU: ");
222 for_each_online_cpu(j
)
223 seq_printf(p
, "%10u ", tau_interrupts(j
));
224 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
227 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
228 /* should this be per processor send/receive? */
229 seq_printf(p
, "IPI (recv/sent): %10u/%u\n",
230 atomic_read(&ipi_recv
), atomic_read(&ipi_sent
));
232 #endif /* CONFIG_PPC32 */
233 seq_printf(p
, "BAD: %10u\n", ppc_spurious_interrupts
);
238 #ifdef CONFIG_HOTPLUG_CPU
239 void fixup_irqs(cpumask_t map
)
247 if (irq_desc
[irq
].status
& IRQ_PER_CPU
)
250 cpus_and(mask
, irq_desc
[irq
].affinity
, map
);
251 if (any_online_cpu(mask
) == NR_CPUS
) {
252 printk("Breaking affinity for irq %i\n", irq
);
255 if (irq_desc
[irq
].chip
->set_affinity
)
256 irq_desc
[irq
].chip
->set_affinity(irq
, mask
);
257 else if (irq_desc
[irq
].action
&& !(warned
++))
258 printk("Cannot set affinity for irq %i\n", irq
);
267 void do_IRQ(struct pt_regs
*regs
)
269 struct pt_regs
*old_regs
= set_irq_regs(regs
);
271 #ifdef CONFIG_IRQSTACKS
272 struct thread_info
*curtp
, *irqtp
;
277 #ifdef CONFIG_DEBUG_STACKOVERFLOW
278 /* Debugging check for stack overflow: is there less than 2KB free? */
282 sp
= __get_SP() & (THREAD_SIZE
-1);
284 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
285 printk("do_IRQ: stack overflow: %ld\n",
286 sp
- sizeof(struct thread_info
));
293 * Every platform is required to implement ppc_md.get_irq.
294 * This function will either return an irq number or NO_IRQ to
295 * indicate there are no more pending.
296 * The value NO_IRQ_IGNORE is for buggy hardware and means that this
297 * IRQ has already been handled. -- Tom
299 irq
= ppc_md
.get_irq();
301 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
) {
302 #ifdef CONFIG_IRQSTACKS
303 /* Switch to the irq stack to handle this */
304 curtp
= current_thread_info();
305 irqtp
= hardirq_ctx
[smp_processor_id()];
306 if (curtp
!= irqtp
) {
307 struct irq_desc
*desc
= irq_desc
+ irq
;
308 void *handler
= desc
->handle_irq
;
311 irqtp
->task
= curtp
->task
;
313 call_handle_irq(irq
, desc
, irqtp
, handler
);
316 set_bits(irqtp
->flags
, &curtp
->flags
);
319 generic_handle_irq(irq
);
320 } else if (irq
!= NO_IRQ_IGNORE
)
321 /* That's not SMP safe ... but who cares ? */
322 ppc_spurious_interrupts
++;
325 set_irq_regs(old_regs
);
327 #ifdef CONFIG_PPC_ISERIES
328 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
329 get_lppaca()->int_dword
.fields
.decr_int
) {
330 get_lppaca()->int_dword
.fields
.decr_int
= 0;
331 /* Signal a fake decrementer interrupt */
332 timer_interrupt(regs
);
337 void __init
init_IRQ(void)
346 #ifdef CONFIG_IRQSTACKS
347 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
348 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
350 void irq_ctx_init(void)
352 struct thread_info
*tp
;
355 for_each_possible_cpu(i
) {
356 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
359 tp
->preempt_count
= SOFTIRQ_OFFSET
;
361 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
364 tp
->preempt_count
= HARDIRQ_OFFSET
;
368 static inline void do_softirq_onstack(void)
370 struct thread_info
*curtp
, *irqtp
;
372 curtp
= current_thread_info();
373 irqtp
= softirq_ctx
[smp_processor_id()];
374 irqtp
->task
= curtp
->task
;
375 call_do_softirq(irqtp
);
380 #define do_softirq_onstack() __do_softirq()
381 #endif /* CONFIG_IRQSTACKS */
383 void do_softirq(void)
390 local_irq_save(flags
);
392 if (local_softirq_pending())
393 do_softirq_onstack();
395 local_irq_restore(flags
);
397 EXPORT_SYMBOL(do_softirq
);
401 * IRQ controller and virtual interrupts
404 #ifdef CONFIG_PPC_MERGE
406 static LIST_HEAD(irq_hosts
);
407 static DEFINE_SPINLOCK(irq_big_lock
);
408 static DEFINE_PER_CPU(unsigned int, irq_radix_reader
);
409 static unsigned int irq_radix_writer
;
410 struct irq_map_entry irq_map
[NR_IRQS
];
411 static unsigned int irq_virq_count
= NR_IRQS
;
412 static struct irq_host
*irq_default_host
;
414 struct irq_host
*irq_alloc_host(unsigned int revmap_type
,
415 unsigned int revmap_arg
,
416 struct irq_host_ops
*ops
,
417 irq_hw_number_t inval_irq
)
419 struct irq_host
*host
;
420 unsigned int size
= sizeof(struct irq_host
);
425 /* Allocate structure and revmap table if using linear mapping */
426 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
427 size
+= revmap_arg
* sizeof(unsigned int);
429 host
= kzalloc(size
, GFP_KERNEL
);
431 host
= alloc_bootmem(size
);
433 memset(host
, 0, size
);
439 host
->revmap_type
= revmap_type
;
440 host
->inval_irq
= inval_irq
;
443 spin_lock_irqsave(&irq_big_lock
, flags
);
445 /* If it's a legacy controller, check for duplicates and
446 * mark it as allocated (we use irq 0 host pointer for that
448 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
449 if (irq_map
[0].host
!= NULL
) {
450 spin_unlock_irqrestore(&irq_big_lock
, flags
);
451 /* If we are early boot, we can't free the structure,
453 * this will be fixed once slab is made available early
454 * instead of the current cruft
460 irq_map
[0].host
= host
;
463 list_add(&host
->link
, &irq_hosts
);
464 spin_unlock_irqrestore(&irq_big_lock
, flags
);
466 /* Additional setups per revmap type */
467 switch(revmap_type
) {
468 case IRQ_HOST_MAP_LEGACY
:
469 /* 0 is always the invalid number for legacy */
471 /* setup us as the host for all legacy interrupts */
472 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
473 irq_map
[i
].hwirq
= 0;
475 irq_map
[i
].host
= host
;
478 /* Clear norequest flags */
479 get_irq_desc(i
)->status
&= ~IRQ_NOREQUEST
;
481 /* Legacy flags are left to default at this point,
482 * one can then use irq_create_mapping() to
483 * explicitely change them
485 ops
->map(host
, i
, i
);
488 case IRQ_HOST_MAP_LINEAR
:
489 rmap
= (unsigned int *)(host
+ 1);
490 for (i
= 0; i
< revmap_arg
; i
++)
492 host
->revmap_data
.linear
.size
= revmap_arg
;
494 host
->revmap_data
.linear
.revmap
= rmap
;
500 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
505 struct irq_host
*irq_find_host(struct device_node
*node
)
507 struct irq_host
*h
, *found
= NULL
;
510 /* We might want to match the legacy controller last since
511 * it might potentially be set to match all interrupts in
512 * the absence of a device node. This isn't a problem so far
515 spin_lock_irqsave(&irq_big_lock
, flags
);
516 list_for_each_entry(h
, &irq_hosts
, link
)
517 if (h
->ops
->match
== NULL
|| h
->ops
->match(h
, node
)) {
521 spin_unlock_irqrestore(&irq_big_lock
, flags
);
524 EXPORT_SYMBOL_GPL(irq_find_host
);
526 void irq_set_default_host(struct irq_host
*host
)
528 pr_debug("irq: Default host set to @0x%p\n", host
);
530 irq_default_host
= host
;
533 void irq_set_virq_count(unsigned int count
)
535 pr_debug("irq: Trying to set virq count to %d\n", count
);
537 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
539 irq_virq_count
= count
;
542 /* radix tree not lockless safe ! we use a brlock-type mecanism
543 * for now, until we can use a lockless radix tree
545 static void irq_radix_wrlock(unsigned long *flags
)
547 unsigned int cpu
, ok
;
549 spin_lock_irqsave(&irq_big_lock
, *flags
);
550 irq_radix_writer
= 1;
555 for_each_possible_cpu(cpu
) {
556 if (per_cpu(irq_radix_reader
, cpu
)) {
566 static void irq_radix_wrunlock(unsigned long flags
)
569 irq_radix_writer
= 0;
570 spin_unlock_irqrestore(&irq_big_lock
, flags
);
573 static void irq_radix_rdlock(unsigned long *flags
)
575 local_irq_save(*flags
);
576 __get_cpu_var(irq_radix_reader
) = 1;
578 if (likely(irq_radix_writer
== 0))
580 __get_cpu_var(irq_radix_reader
) = 0;
582 spin_lock(&irq_big_lock
);
583 __get_cpu_var(irq_radix_reader
) = 1;
584 spin_unlock(&irq_big_lock
);
587 static void irq_radix_rdunlock(unsigned long flags
)
589 __get_cpu_var(irq_radix_reader
) = 0;
590 local_irq_restore(flags
);
594 unsigned int irq_create_mapping(struct irq_host
*host
,
595 irq_hw_number_t hwirq
)
597 unsigned int virq
, hint
;
599 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
601 /* Look for default host if nececssary */
603 host
= irq_default_host
;
605 printk(KERN_WARNING
"irq_create_mapping called for"
606 " NULL host, hwirq=%lx\n", hwirq
);
610 pr_debug("irq: -> using host @%p\n", host
);
612 /* Check if mapping already exist, if it does, call
613 * host->ops->map() to update the flags
615 virq
= irq_find_mapping(host
, hwirq
);
616 if (virq
!= NO_IRQ
) {
617 if (host
->ops
->remap
)
618 host
->ops
->remap(host
, virq
, hwirq
);
619 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
623 /* Get a virtual interrupt number */
624 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
626 virq
= (unsigned int)hwirq
;
627 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
631 /* Allocate a virtual interrupt number */
632 hint
= hwirq
% irq_virq_count
;
633 virq
= irq_alloc_virt(host
, 1, hint
);
634 if (virq
== NO_IRQ
) {
635 pr_debug("irq: -> virq allocation failed\n");
639 pr_debug("irq: -> obtained virq %d\n", virq
);
641 /* Clear IRQ_NOREQUEST flag */
642 get_irq_desc(virq
)->status
&= ~IRQ_NOREQUEST
;
646 irq_map
[virq
].hwirq
= hwirq
;
648 if (host
->ops
->map(host
, virq
, hwirq
)) {
649 pr_debug("irq: -> mapping failed, freeing\n");
650 irq_free_virt(virq
, 1);
655 EXPORT_SYMBOL_GPL(irq_create_mapping
);
657 unsigned int irq_create_of_mapping(struct device_node
*controller
,
658 u32
*intspec
, unsigned int intsize
)
660 struct irq_host
*host
;
661 irq_hw_number_t hwirq
;
662 unsigned int type
= IRQ_TYPE_NONE
;
665 if (controller
== NULL
)
666 host
= irq_default_host
;
668 host
= irq_find_host(controller
);
670 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
671 controller
->full_name
);
675 /* If host has no translation, then we assume interrupt line */
676 if (host
->ops
->xlate
== NULL
)
679 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
685 virq
= irq_create_mapping(host
, hwirq
);
689 /* Set type if specified and different than the current one */
690 if (type
!= IRQ_TYPE_NONE
&&
691 type
!= (get_irq_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
692 set_irq_type(virq
, type
);
695 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
697 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
701 if (of_irq_map_one(dev
, index
, &oirq
))
704 return irq_create_of_mapping(oirq
.controller
, oirq
.specifier
,
707 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
709 void irq_dispose_mapping(unsigned int virq
)
711 struct irq_host
*host
;
712 irq_hw_number_t hwirq
;
718 host
= irq_map
[virq
].host
;
719 WARN_ON (host
== NULL
);
723 /* Never unmap legacy interrupts */
724 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
727 /* remove chip and handler */
728 set_irq_chip_and_handler(virq
, NULL
, NULL
);
730 /* Make sure it's completed */
731 synchronize_irq(virq
);
733 /* Tell the PIC about it */
734 if (host
->ops
->unmap
)
735 host
->ops
->unmap(host
, virq
);
738 /* Clear reverse map */
739 hwirq
= irq_map
[virq
].hwirq
;
740 switch(host
->revmap_type
) {
741 case IRQ_HOST_MAP_LINEAR
:
742 if (hwirq
< host
->revmap_data
.linear
.size
)
743 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
745 case IRQ_HOST_MAP_TREE
:
746 /* Check if radix tree allocated yet */
747 if (host
->revmap_data
.tree
.gfp_mask
== 0)
749 irq_radix_wrlock(&flags
);
750 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
751 irq_radix_wrunlock(flags
);
757 irq_map
[virq
].hwirq
= host
->inval_irq
;
760 get_irq_desc(virq
)->status
|= IRQ_NOREQUEST
;
763 irq_free_virt(virq
, 1);
765 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
767 unsigned int irq_find_mapping(struct irq_host
*host
,
768 irq_hw_number_t hwirq
)
771 unsigned int hint
= hwirq
% irq_virq_count
;
773 /* Look for default host if nececssary */
775 host
= irq_default_host
;
779 /* legacy -> bail early */
780 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
783 /* Slow path does a linear search of the map */
784 if (hint
< NUM_ISA_INTERRUPTS
)
785 hint
= NUM_ISA_INTERRUPTS
;
788 if (irq_map
[i
].host
== host
&&
789 irq_map
[i
].hwirq
== hwirq
)
792 if (i
>= irq_virq_count
)
793 i
= NUM_ISA_INTERRUPTS
;
797 EXPORT_SYMBOL_GPL(irq_find_mapping
);
800 unsigned int irq_radix_revmap(struct irq_host
*host
,
801 irq_hw_number_t hwirq
)
803 struct radix_tree_root
*tree
;
804 struct irq_map_entry
*ptr
;
808 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
810 /* Check if the radix tree exist yet. We test the value of
811 * the gfp_mask for that. Sneaky but saves another int in the
812 * structure. If not, we fallback to slow mode
814 tree
= &host
->revmap_data
.tree
;
815 if (tree
->gfp_mask
== 0)
816 return irq_find_mapping(host
, hwirq
);
818 /* Now try to resolve */
819 irq_radix_rdlock(&flags
);
820 ptr
= radix_tree_lookup(tree
, hwirq
);
821 irq_radix_rdunlock(flags
);
823 /* Found it, return */
825 virq
= ptr
- irq_map
;
829 /* If not there, try to insert it */
830 virq
= irq_find_mapping(host
, hwirq
);
831 if (virq
!= NO_IRQ
) {
832 irq_radix_wrlock(&flags
);
833 radix_tree_insert(tree
, hwirq
, &irq_map
[virq
]);
834 irq_radix_wrunlock(flags
);
839 unsigned int irq_linear_revmap(struct irq_host
*host
,
840 irq_hw_number_t hwirq
)
842 unsigned int *revmap
;
844 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
846 /* Check revmap bounds */
847 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
848 return irq_find_mapping(host
, hwirq
);
850 /* Check if revmap was allocated */
851 revmap
= host
->revmap_data
.linear
.revmap
;
852 if (unlikely(revmap
== NULL
))
853 return irq_find_mapping(host
, hwirq
);
855 /* Fill up revmap with slow path if no mapping found */
856 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
857 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
859 return revmap
[hwirq
];
862 unsigned int irq_alloc_virt(struct irq_host
*host
,
867 unsigned int i
, j
, found
= NO_IRQ
;
869 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
872 spin_lock_irqsave(&irq_big_lock
, flags
);
874 /* Use hint for 1 interrupt if any */
875 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
876 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
881 /* Look for count consecutive numbers in the allocatable
884 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
885 if (irq_map
[i
].host
!= NULL
)
891 found
= i
- count
+ 1;
895 if (found
== NO_IRQ
) {
896 spin_unlock_irqrestore(&irq_big_lock
, flags
);
900 for (i
= found
; i
< (found
+ count
); i
++) {
901 irq_map
[i
].hwirq
= host
->inval_irq
;
903 irq_map
[i
].host
= host
;
905 spin_unlock_irqrestore(&irq_big_lock
, flags
);
909 void irq_free_virt(unsigned int virq
, unsigned int count
)
914 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
915 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
917 spin_lock_irqsave(&irq_big_lock
, flags
);
918 for (i
= virq
; i
< (virq
+ count
); i
++) {
919 struct irq_host
*host
;
921 if (i
< NUM_ISA_INTERRUPTS
||
922 (virq
+ count
) > irq_virq_count
)
925 host
= irq_map
[i
].host
;
926 irq_map
[i
].hwirq
= host
->inval_irq
;
928 irq_map
[i
].host
= NULL
;
930 spin_unlock_irqrestore(&irq_big_lock
, flags
);
933 void irq_early_init(void)
937 for (i
= 0; i
< NR_IRQS
; i
++)
938 get_irq_desc(i
)->status
|= IRQ_NOREQUEST
;
941 /* We need to create the radix trees late */
942 static int irq_late_init(void)
947 irq_radix_wrlock(&flags
);
948 list_for_each_entry(h
, &irq_hosts
, link
) {
949 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
950 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_ATOMIC
);
952 irq_radix_wrunlock(flags
);
956 arch_initcall(irq_late_init
);
958 #endif /* CONFIG_PPC_MERGE */
961 static int __init
setup_noirqdistrib(char *str
)
967 __setup("noirqdistrib", setup_noirqdistrib
);
968 #endif /* CONFIG_PPC64 */