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)
347 #ifdef CONFIG_IRQSTACKS
348 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
349 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
351 void irq_ctx_init(void)
353 struct thread_info
*tp
;
356 for_each_possible_cpu(i
) {
357 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
360 tp
->preempt_count
= SOFTIRQ_OFFSET
;
362 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
365 tp
->preempt_count
= HARDIRQ_OFFSET
;
369 static inline void do_softirq_onstack(void)
371 struct thread_info
*curtp
, *irqtp
;
373 curtp
= current_thread_info();
374 irqtp
= softirq_ctx
[smp_processor_id()];
375 irqtp
->task
= curtp
->task
;
376 call_do_softirq(irqtp
);
381 #define do_softirq_onstack() __do_softirq()
382 #endif /* CONFIG_IRQSTACKS */
384 void do_softirq(void)
391 local_irq_save(flags
);
393 if (local_softirq_pending())
394 do_softirq_onstack();
396 local_irq_restore(flags
);
398 EXPORT_SYMBOL(do_softirq
);
402 * IRQ controller and virtual interrupts
405 #ifdef CONFIG_PPC_MERGE
407 static LIST_HEAD(irq_hosts
);
408 static DEFINE_SPINLOCK(irq_big_lock
);
409 static DEFINE_PER_CPU(unsigned int, irq_radix_reader
);
410 static unsigned int irq_radix_writer
;
411 struct irq_map_entry irq_map
[NR_IRQS
];
412 static unsigned int irq_virq_count
= NR_IRQS
;
413 static struct irq_host
*irq_default_host
;
415 irq_hw_number_t
virq_to_hw(unsigned int virq
)
417 return irq_map
[virq
].hwirq
;
419 EXPORT_SYMBOL_GPL(virq_to_hw
);
421 struct irq_host
*irq_alloc_host(unsigned int revmap_type
,
422 unsigned int revmap_arg
,
423 struct irq_host_ops
*ops
,
424 irq_hw_number_t inval_irq
)
426 struct irq_host
*host
;
427 unsigned int size
= sizeof(struct irq_host
);
432 /* Allocate structure and revmap table if using linear mapping */
433 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
434 size
+= revmap_arg
* sizeof(unsigned int);
436 host
= kzalloc(size
, GFP_KERNEL
);
438 host
= alloc_bootmem(size
);
440 memset(host
, 0, size
);
446 host
->revmap_type
= revmap_type
;
447 host
->inval_irq
= inval_irq
;
450 spin_lock_irqsave(&irq_big_lock
, flags
);
452 /* If it's a legacy controller, check for duplicates and
453 * mark it as allocated (we use irq 0 host pointer for that
455 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
456 if (irq_map
[0].host
!= NULL
) {
457 spin_unlock_irqrestore(&irq_big_lock
, flags
);
458 /* If we are early boot, we can't free the structure,
460 * this will be fixed once slab is made available early
461 * instead of the current cruft
467 irq_map
[0].host
= host
;
470 list_add(&host
->link
, &irq_hosts
);
471 spin_unlock_irqrestore(&irq_big_lock
, flags
);
473 /* Additional setups per revmap type */
474 switch(revmap_type
) {
475 case IRQ_HOST_MAP_LEGACY
:
476 /* 0 is always the invalid number for legacy */
478 /* setup us as the host for all legacy interrupts */
479 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
480 irq_map
[i
].hwirq
= 0;
482 irq_map
[i
].host
= host
;
485 /* Clear norequest flags */
486 get_irq_desc(i
)->status
&= ~IRQ_NOREQUEST
;
488 /* Legacy flags are left to default at this point,
489 * one can then use irq_create_mapping() to
490 * explicitely change them
492 ops
->map(host
, i
, i
);
495 case IRQ_HOST_MAP_LINEAR
:
496 rmap
= (unsigned int *)(host
+ 1);
497 for (i
= 0; i
< revmap_arg
; i
++)
499 host
->revmap_data
.linear
.size
= revmap_arg
;
501 host
->revmap_data
.linear
.revmap
= rmap
;
507 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
512 struct irq_host
*irq_find_host(struct device_node
*node
)
514 struct irq_host
*h
, *found
= NULL
;
517 /* We might want to match the legacy controller last since
518 * it might potentially be set to match all interrupts in
519 * the absence of a device node. This isn't a problem so far
522 spin_lock_irqsave(&irq_big_lock
, flags
);
523 list_for_each_entry(h
, &irq_hosts
, link
)
524 if (h
->ops
->match
== NULL
|| h
->ops
->match(h
, node
)) {
528 spin_unlock_irqrestore(&irq_big_lock
, flags
);
531 EXPORT_SYMBOL_GPL(irq_find_host
);
533 void irq_set_default_host(struct irq_host
*host
)
535 pr_debug("irq: Default host set to @0x%p\n", host
);
537 irq_default_host
= host
;
540 void irq_set_virq_count(unsigned int count
)
542 pr_debug("irq: Trying to set virq count to %d\n", count
);
544 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
546 irq_virq_count
= count
;
549 /* radix tree not lockless safe ! we use a brlock-type mecanism
550 * for now, until we can use a lockless radix tree
552 static void irq_radix_wrlock(unsigned long *flags
)
554 unsigned int cpu
, ok
;
556 spin_lock_irqsave(&irq_big_lock
, *flags
);
557 irq_radix_writer
= 1;
562 for_each_possible_cpu(cpu
) {
563 if (per_cpu(irq_radix_reader
, cpu
)) {
573 static void irq_radix_wrunlock(unsigned long flags
)
576 irq_radix_writer
= 0;
577 spin_unlock_irqrestore(&irq_big_lock
, flags
);
580 static void irq_radix_rdlock(unsigned long *flags
)
582 local_irq_save(*flags
);
583 __get_cpu_var(irq_radix_reader
) = 1;
585 if (likely(irq_radix_writer
== 0))
587 __get_cpu_var(irq_radix_reader
) = 0;
589 spin_lock(&irq_big_lock
);
590 __get_cpu_var(irq_radix_reader
) = 1;
591 spin_unlock(&irq_big_lock
);
594 static void irq_radix_rdunlock(unsigned long flags
)
596 __get_cpu_var(irq_radix_reader
) = 0;
597 local_irq_restore(flags
);
600 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
601 irq_hw_number_t hwirq
)
603 /* Clear IRQ_NOREQUEST flag */
604 get_irq_desc(virq
)->status
&= ~IRQ_NOREQUEST
;
608 irq_map
[virq
].hwirq
= hwirq
;
611 if (host
->ops
->map(host
, virq
, hwirq
)) {
612 pr_debug("irq: -> mapping failed, freeing\n");
613 irq_free_virt(virq
, 1);
620 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
625 host
= irq_default_host
;
627 BUG_ON(host
== NULL
);
628 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
630 virq
= irq_alloc_virt(host
, 1, 0);
631 if (virq
== NO_IRQ
) {
632 pr_debug("irq: create_direct virq allocation failed\n");
636 pr_debug("irq: create_direct obtained virq %d\n", virq
);
638 if (irq_setup_virq(host
, virq
, virq
))
644 unsigned int irq_create_mapping(struct irq_host
*host
,
645 irq_hw_number_t hwirq
)
647 unsigned int virq
, hint
;
649 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
651 /* Look for default host if nececssary */
653 host
= irq_default_host
;
655 printk(KERN_WARNING
"irq_create_mapping called for"
656 " NULL host, hwirq=%lx\n", hwirq
);
660 pr_debug("irq: -> using host @%p\n", host
);
662 /* Check if mapping already exist, if it does, call
663 * host->ops->map() to update the flags
665 virq
= irq_find_mapping(host
, hwirq
);
666 if (virq
!= NO_IRQ
) {
667 if (host
->ops
->remap
)
668 host
->ops
->remap(host
, virq
, hwirq
);
669 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
673 /* Get a virtual interrupt number */
674 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
676 virq
= (unsigned int)hwirq
;
677 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
681 /* Allocate a virtual interrupt number */
682 hint
= hwirq
% irq_virq_count
;
683 virq
= irq_alloc_virt(host
, 1, hint
);
684 if (virq
== NO_IRQ
) {
685 pr_debug("irq: -> virq allocation failed\n");
689 pr_debug("irq: -> obtained virq %d\n", virq
);
691 if (irq_setup_virq(host
, virq
, hwirq
))
696 EXPORT_SYMBOL_GPL(irq_create_mapping
);
698 unsigned int irq_create_of_mapping(struct device_node
*controller
,
699 u32
*intspec
, unsigned int intsize
)
701 struct irq_host
*host
;
702 irq_hw_number_t hwirq
;
703 unsigned int type
= IRQ_TYPE_NONE
;
706 if (controller
== NULL
)
707 host
= irq_default_host
;
709 host
= irq_find_host(controller
);
711 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
712 controller
->full_name
);
716 /* If host has no translation, then we assume interrupt line */
717 if (host
->ops
->xlate
== NULL
)
720 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
726 virq
= irq_create_mapping(host
, hwirq
);
730 /* Set type if specified and different than the current one */
731 if (type
!= IRQ_TYPE_NONE
&&
732 type
!= (get_irq_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
733 set_irq_type(virq
, type
);
736 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
738 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
742 if (of_irq_map_one(dev
, index
, &oirq
))
745 return irq_create_of_mapping(oirq
.controller
, oirq
.specifier
,
748 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
750 void irq_dispose_mapping(unsigned int virq
)
752 struct irq_host
*host
;
753 irq_hw_number_t hwirq
;
759 host
= irq_map
[virq
].host
;
760 WARN_ON (host
== NULL
);
764 /* Never unmap legacy interrupts */
765 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
768 /* remove chip and handler */
769 set_irq_chip_and_handler(virq
, NULL
, NULL
);
771 /* Make sure it's completed */
772 synchronize_irq(virq
);
774 /* Tell the PIC about it */
775 if (host
->ops
->unmap
)
776 host
->ops
->unmap(host
, virq
);
779 /* Clear reverse map */
780 hwirq
= irq_map
[virq
].hwirq
;
781 switch(host
->revmap_type
) {
782 case IRQ_HOST_MAP_LINEAR
:
783 if (hwirq
< host
->revmap_data
.linear
.size
)
784 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
786 case IRQ_HOST_MAP_TREE
:
787 /* Check if radix tree allocated yet */
788 if (host
->revmap_data
.tree
.gfp_mask
== 0)
790 irq_radix_wrlock(&flags
);
791 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
792 irq_radix_wrunlock(flags
);
798 irq_map
[virq
].hwirq
= host
->inval_irq
;
801 get_irq_desc(virq
)->status
|= IRQ_NOREQUEST
;
804 irq_free_virt(virq
, 1);
806 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
808 unsigned int irq_find_mapping(struct irq_host
*host
,
809 irq_hw_number_t hwirq
)
812 unsigned int hint
= hwirq
% irq_virq_count
;
814 /* Look for default host if nececssary */
816 host
= irq_default_host
;
820 /* legacy -> bail early */
821 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
824 /* Slow path does a linear search of the map */
825 if (hint
< NUM_ISA_INTERRUPTS
)
826 hint
= NUM_ISA_INTERRUPTS
;
829 if (irq_map
[i
].host
== host
&&
830 irq_map
[i
].hwirq
== hwirq
)
833 if (i
>= irq_virq_count
)
834 i
= NUM_ISA_INTERRUPTS
;
838 EXPORT_SYMBOL_GPL(irq_find_mapping
);
841 unsigned int irq_radix_revmap(struct irq_host
*host
,
842 irq_hw_number_t hwirq
)
844 struct radix_tree_root
*tree
;
845 struct irq_map_entry
*ptr
;
849 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
851 /* Check if the radix tree exist yet. We test the value of
852 * the gfp_mask for that. Sneaky but saves another int in the
853 * structure. If not, we fallback to slow mode
855 tree
= &host
->revmap_data
.tree
;
856 if (tree
->gfp_mask
== 0)
857 return irq_find_mapping(host
, hwirq
);
859 /* Now try to resolve */
860 irq_radix_rdlock(&flags
);
861 ptr
= radix_tree_lookup(tree
, hwirq
);
862 irq_radix_rdunlock(flags
);
864 /* Found it, return */
866 virq
= ptr
- irq_map
;
870 /* If not there, try to insert it */
871 virq
= irq_find_mapping(host
, hwirq
);
872 if (virq
!= NO_IRQ
) {
873 irq_radix_wrlock(&flags
);
874 radix_tree_insert(tree
, hwirq
, &irq_map
[virq
]);
875 irq_radix_wrunlock(flags
);
880 unsigned int irq_linear_revmap(struct irq_host
*host
,
881 irq_hw_number_t hwirq
)
883 unsigned int *revmap
;
885 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
887 /* Check revmap bounds */
888 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
889 return irq_find_mapping(host
, hwirq
);
891 /* Check if revmap was allocated */
892 revmap
= host
->revmap_data
.linear
.revmap
;
893 if (unlikely(revmap
== NULL
))
894 return irq_find_mapping(host
, hwirq
);
896 /* Fill up revmap with slow path if no mapping found */
897 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
898 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
900 return revmap
[hwirq
];
903 unsigned int irq_alloc_virt(struct irq_host
*host
,
908 unsigned int i
, j
, found
= NO_IRQ
;
910 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
913 spin_lock_irqsave(&irq_big_lock
, flags
);
915 /* Use hint for 1 interrupt if any */
916 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
917 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
922 /* Look for count consecutive numbers in the allocatable
925 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
926 if (irq_map
[i
].host
!= NULL
)
932 found
= i
- count
+ 1;
936 if (found
== NO_IRQ
) {
937 spin_unlock_irqrestore(&irq_big_lock
, flags
);
941 for (i
= found
; i
< (found
+ count
); i
++) {
942 irq_map
[i
].hwirq
= host
->inval_irq
;
944 irq_map
[i
].host
= host
;
946 spin_unlock_irqrestore(&irq_big_lock
, flags
);
950 void irq_free_virt(unsigned int virq
, unsigned int count
)
955 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
956 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
958 spin_lock_irqsave(&irq_big_lock
, flags
);
959 for (i
= virq
; i
< (virq
+ count
); i
++) {
960 struct irq_host
*host
;
962 if (i
< NUM_ISA_INTERRUPTS
||
963 (virq
+ count
) > irq_virq_count
)
966 host
= irq_map
[i
].host
;
967 irq_map
[i
].hwirq
= host
->inval_irq
;
969 irq_map
[i
].host
= NULL
;
971 spin_unlock_irqrestore(&irq_big_lock
, flags
);
974 void irq_early_init(void)
978 for (i
= 0; i
< NR_IRQS
; i
++)
979 get_irq_desc(i
)->status
|= IRQ_NOREQUEST
;
982 /* We need to create the radix trees late */
983 static int irq_late_init(void)
988 irq_radix_wrlock(&flags
);
989 list_for_each_entry(h
, &irq_hosts
, link
) {
990 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
991 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_ATOMIC
);
993 irq_radix_wrunlock(flags
);
997 arch_initcall(irq_late_init
);
999 #endif /* CONFIG_PPC_MERGE */
1002 static int __init
setup_noirqdistrib(char *str
)
1004 distribute_irqs
= 0;
1008 __setup("noirqdistrib", setup_noirqdistrib
);
1009 #endif /* CONFIG_PPC64 */