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>
55 #include <linux/debugfs.h>
57 #include <asm/uaccess.h>
58 #include <asm/system.h>
60 #include <asm/pgtable.h>
62 #include <asm/cache.h>
64 #include <asm/ptrace.h>
65 #include <asm/machdep.h>
69 #include <asm/firmware.h>
70 #include <asm/lv1call.h>
73 int __irq_offset_value
;
74 static int ppc_spurious_interrupts
;
77 EXPORT_SYMBOL(__irq_offset_value
);
78 atomic_t ppc_n_lost_interrupts
;
81 extern int tau_initialized
;
82 extern int tau_interrupts(int);
84 #endif /* CONFIG_PPC32 */
87 EXPORT_SYMBOL(irq_desc
);
89 int distribute_irqs
= 1;
91 static inline notrace
unsigned long get_hard_enabled(void)
93 unsigned long enabled
;
95 __asm__
__volatile__("lbz %0,%1(13)"
96 : "=r" (enabled
) : "i" (offsetof(struct paca_struct
, hard_enabled
)));
101 static inline notrace
void set_soft_enabled(unsigned long enable
)
103 __asm__
__volatile__("stb %0,%1(13)"
104 : : "r" (enable
), "i" (offsetof(struct paca_struct
, soft_enabled
)));
107 notrace
void raw_local_irq_restore(unsigned long en
)
110 * get_paca()->soft_enabled = en;
111 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
112 * That was allowed before, and in such a case we do need to take care
113 * that gcc will set soft_enabled directly via r13, not choose to use
114 * an intermediate register, lest we're preempted to a different cpu.
116 set_soft_enabled(en
);
120 if (firmware_has_feature(FW_FEATURE_ISERIES
)) {
122 * Do we need to disable preemption here? Not really: in the
123 * unlikely event that we're preempted to a different cpu in
124 * between getting r13, loading its lppaca_ptr, and loading
125 * its any_int, we might call iseries_handle_interrupts without
126 * an interrupt pending on the new cpu, but that's no disaster,
127 * is it? And the business of preempting us off the old cpu
128 * would itself involve a local_irq_restore which handles the
129 * interrupt to that cpu.
131 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
132 * to avoid any preemption checking added into get_paca().
134 if (local_paca
->lppaca_ptr
->int_dword
.any_int
)
135 iseries_handle_interrupts();
138 if (test_perf_counter_pending()) {
139 clear_perf_counter_pending();
140 perf_counter_do_pending();
144 * if (get_paca()->hard_enabled) return;
145 * But again we need to take care that gcc gets hard_enabled directly
146 * via r13, not choose to use an intermediate register, lest we're
147 * preempted to a different cpu in between the two instructions.
149 if (get_hard_enabled())
153 * Need to hard-enable interrupts here. Since currently disabled,
154 * no need to take further asm precautions against preemption; but
155 * use local_paca instead of get_paca() to avoid preemption checking.
157 local_paca
->hard_enabled
= en
;
158 if ((int)mfspr(SPRN_DEC
) < 0)
162 * Force the delivery of pending soft-disabled interrupts on PS3.
163 * Any HV call will have this side effect.
165 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
167 lv1_get_version_info(&tmp
);
172 EXPORT_SYMBOL(raw_local_irq_restore
);
173 #endif /* CONFIG_PPC64 */
175 int show_interrupts(struct seq_file
*p
, void *v
)
177 int i
= *(loff_t
*)v
, j
;
178 struct irqaction
*action
;
179 struct irq_desc
*desc
;
184 for_each_online_cpu(j
)
185 seq_printf(p
, "CPU%d ", j
);
190 desc
= get_irq_desc(i
);
191 spin_lock_irqsave(&desc
->lock
, flags
);
192 action
= desc
->action
;
193 if (!action
|| !action
->handler
)
195 seq_printf(p
, "%3d: ", i
);
197 for_each_online_cpu(j
)
198 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
200 seq_printf(p
, "%10u ", kstat_irqs(i
));
201 #endif /* CONFIG_SMP */
203 seq_printf(p
, " %s ", desc
->chip
->typename
);
205 seq_puts(p
, " None ");
206 seq_printf(p
, "%s", (desc
->status
& IRQ_LEVEL
) ? "Level " : "Edge ");
207 seq_printf(p
, " %s", action
->name
);
208 for (action
= action
->next
; action
; action
= action
->next
)
209 seq_printf(p
, ", %s", action
->name
);
212 spin_unlock_irqrestore(&desc
->lock
, flags
);
213 } else if (i
== NR_IRQS
) {
214 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
215 if (tau_initialized
){
216 seq_puts(p
, "TAU: ");
217 for_each_online_cpu(j
)
218 seq_printf(p
, "%10u ", tau_interrupts(j
));
219 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
221 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT*/
222 seq_printf(p
, "BAD: %10u\n", ppc_spurious_interrupts
);
227 #ifdef CONFIG_HOTPLUG_CPU
228 void fixup_irqs(cpumask_t map
)
236 if (irq_desc
[irq
].status
& IRQ_PER_CPU
)
239 cpumask_and(&mask
, irq_desc
[irq
].affinity
, &map
);
240 if (any_online_cpu(mask
) == NR_CPUS
) {
241 printk("Breaking affinity for irq %i\n", irq
);
244 if (irq_desc
[irq
].chip
->set_affinity
)
245 irq_desc
[irq
].chip
->set_affinity(irq
, &mask
);
246 else if (irq_desc
[irq
].action
&& !(warned
++))
247 printk("Cannot set affinity for irq %i\n", irq
);
256 void do_IRQ(struct pt_regs
*regs
)
258 struct pt_regs
*old_regs
= set_irq_regs(regs
);
260 #ifdef CONFIG_IRQSTACKS
261 struct thread_info
*curtp
, *irqtp
;
266 #ifdef CONFIG_DEBUG_STACKOVERFLOW
267 /* Debugging check for stack overflow: is there less than 2KB free? */
271 sp
= __get_SP() & (THREAD_SIZE
-1);
273 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
274 printk("do_IRQ: stack overflow: %ld\n",
275 sp
- sizeof(struct thread_info
));
282 * Every platform is required to implement ppc_md.get_irq.
283 * This function will either return an irq number or NO_IRQ to
284 * indicate there are no more pending.
285 * The value NO_IRQ_IGNORE is for buggy hardware and means that this
286 * IRQ has already been handled. -- Tom
288 irq
= ppc_md
.get_irq();
290 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
) {
291 #ifdef CONFIG_IRQSTACKS
292 /* Switch to the irq stack to handle this */
293 curtp
= current_thread_info();
294 irqtp
= hardirq_ctx
[smp_processor_id()];
295 if (curtp
!= irqtp
) {
296 struct irq_desc
*desc
= irq_desc
+ irq
;
297 void *handler
= desc
->handle_irq
;
298 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
301 irqtp
->task
= curtp
->task
;
304 /* Copy the softirq bits in preempt_count so that the
305 * softirq checks work in the hardirq context.
307 irqtp
->preempt_count
=
308 (irqtp
->preempt_count
& ~SOFTIRQ_MASK
) |
309 (curtp
->preempt_count
& SOFTIRQ_MASK
);
311 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
312 _ALIGN_UP(sizeof(struct thread_info
), 16);
313 call_handle_irq(irq
, desc
, irqtp
, handler
);
314 current
->thread
.ksp_limit
= saved_sp_limit
;
318 /* Set any flag that may have been set on the
322 set_bits(irqtp
->flags
, &curtp
->flags
);
325 generic_handle_irq(irq
);
326 } else if (irq
!= NO_IRQ_IGNORE
)
327 /* That's not SMP safe ... but who cares ? */
328 ppc_spurious_interrupts
++;
331 set_irq_regs(old_regs
);
333 #ifdef CONFIG_PPC_ISERIES
334 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
335 get_lppaca()->int_dword
.fields
.decr_int
) {
336 get_lppaca()->int_dword
.fields
.decr_int
= 0;
337 /* Signal a fake decrementer interrupt */
338 timer_interrupt(regs
);
343 void __init
init_IRQ(void)
353 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
354 struct thread_info
*critirq_ctx
[NR_CPUS
] __read_mostly
;
355 struct thread_info
*dbgirq_ctx
[NR_CPUS
] __read_mostly
;
356 struct thread_info
*mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
358 void exc_lvl_ctx_init(void)
360 struct thread_info
*tp
;
363 for_each_possible_cpu(i
) {
364 memset((void *)critirq_ctx
[i
], 0, THREAD_SIZE
);
367 tp
->preempt_count
= 0;
370 memset((void *)dbgirq_ctx
[i
], 0, THREAD_SIZE
);
373 tp
->preempt_count
= 0;
375 memset((void *)mcheckirq_ctx
[i
], 0, THREAD_SIZE
);
376 tp
= mcheckirq_ctx
[i
];
378 tp
->preempt_count
= HARDIRQ_OFFSET
;
384 #ifdef CONFIG_IRQSTACKS
385 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
386 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
388 void irq_ctx_init(void)
390 struct thread_info
*tp
;
393 for_each_possible_cpu(i
) {
394 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
397 tp
->preempt_count
= 0;
399 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
402 tp
->preempt_count
= HARDIRQ_OFFSET
;
406 static inline void do_softirq_onstack(void)
408 struct thread_info
*curtp
, *irqtp
;
409 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
411 curtp
= current_thread_info();
412 irqtp
= softirq_ctx
[smp_processor_id()];
413 irqtp
->task
= curtp
->task
;
414 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
415 _ALIGN_UP(sizeof(struct thread_info
), 16);
416 call_do_softirq(irqtp
);
417 current
->thread
.ksp_limit
= saved_sp_limit
;
422 #define do_softirq_onstack() __do_softirq()
423 #endif /* CONFIG_IRQSTACKS */
425 void do_softirq(void)
432 local_irq_save(flags
);
434 if (local_softirq_pending())
435 do_softirq_onstack();
437 local_irq_restore(flags
);
442 * IRQ controller and virtual interrupts
445 static LIST_HEAD(irq_hosts
);
446 static DEFINE_SPINLOCK(irq_big_lock
);
447 static unsigned int revmap_trees_allocated
;
448 static DEFINE_MUTEX(revmap_trees_mutex
);
449 struct irq_map_entry irq_map
[NR_IRQS
];
450 static unsigned int irq_virq_count
= NR_IRQS
;
451 static struct irq_host
*irq_default_host
;
453 irq_hw_number_t
virq_to_hw(unsigned int virq
)
455 return irq_map
[virq
].hwirq
;
457 EXPORT_SYMBOL_GPL(virq_to_hw
);
459 static int default_irq_host_match(struct irq_host
*h
, struct device_node
*np
)
461 return h
->of_node
!= NULL
&& h
->of_node
== np
;
464 struct irq_host
*irq_alloc_host(struct device_node
*of_node
,
465 unsigned int revmap_type
,
466 unsigned int revmap_arg
,
467 struct irq_host_ops
*ops
,
468 irq_hw_number_t inval_irq
)
470 struct irq_host
*host
;
471 unsigned int size
= sizeof(struct irq_host
);
476 /* Allocate structure and revmap table if using linear mapping */
477 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
478 size
+= revmap_arg
* sizeof(unsigned int);
479 host
= zalloc_maybe_bootmem(size
, GFP_KERNEL
);
484 host
->revmap_type
= revmap_type
;
485 host
->inval_irq
= inval_irq
;
487 host
->of_node
= of_node_get(of_node
);
489 if (host
->ops
->match
== NULL
)
490 host
->ops
->match
= default_irq_host_match
;
492 spin_lock_irqsave(&irq_big_lock
, flags
);
494 /* If it's a legacy controller, check for duplicates and
495 * mark it as allocated (we use irq 0 host pointer for that
497 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
498 if (irq_map
[0].host
!= NULL
) {
499 spin_unlock_irqrestore(&irq_big_lock
, flags
);
500 /* If we are early boot, we can't free the structure,
502 * this will be fixed once slab is made available early
503 * instead of the current cruft
509 irq_map
[0].host
= host
;
512 list_add(&host
->link
, &irq_hosts
);
513 spin_unlock_irqrestore(&irq_big_lock
, flags
);
515 /* Additional setups per revmap type */
516 switch(revmap_type
) {
517 case IRQ_HOST_MAP_LEGACY
:
518 /* 0 is always the invalid number for legacy */
520 /* setup us as the host for all legacy interrupts */
521 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
522 irq_map
[i
].hwirq
= i
;
524 irq_map
[i
].host
= host
;
527 /* Clear norequest flags */
528 get_irq_desc(i
)->status
&= ~IRQ_NOREQUEST
;
530 /* Legacy flags are left to default at this point,
531 * one can then use irq_create_mapping() to
532 * explicitly change them
534 ops
->map(host
, i
, i
);
537 case IRQ_HOST_MAP_LINEAR
:
538 rmap
= (unsigned int *)(host
+ 1);
539 for (i
= 0; i
< revmap_arg
; i
++)
541 host
->revmap_data
.linear
.size
= revmap_arg
;
543 host
->revmap_data
.linear
.revmap
= rmap
;
549 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
554 struct irq_host
*irq_find_host(struct device_node
*node
)
556 struct irq_host
*h
, *found
= NULL
;
559 /* We might want to match the legacy controller last since
560 * it might potentially be set to match all interrupts in
561 * the absence of a device node. This isn't a problem so far
564 spin_lock_irqsave(&irq_big_lock
, flags
);
565 list_for_each_entry(h
, &irq_hosts
, link
)
566 if (h
->ops
->match(h
, node
)) {
570 spin_unlock_irqrestore(&irq_big_lock
, flags
);
573 EXPORT_SYMBOL_GPL(irq_find_host
);
575 void irq_set_default_host(struct irq_host
*host
)
577 pr_debug("irq: Default host set to @0x%p\n", host
);
579 irq_default_host
= host
;
582 void irq_set_virq_count(unsigned int count
)
584 pr_debug("irq: Trying to set virq count to %d\n", count
);
586 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
588 irq_virq_count
= count
;
591 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
592 irq_hw_number_t hwirq
)
594 /* Clear IRQ_NOREQUEST flag */
595 get_irq_desc(virq
)->status
&= ~IRQ_NOREQUEST
;
599 irq_map
[virq
].hwirq
= hwirq
;
602 if (host
->ops
->map(host
, virq
, hwirq
)) {
603 pr_debug("irq: -> mapping failed, freeing\n");
604 irq_free_virt(virq
, 1);
611 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
616 host
= irq_default_host
;
618 BUG_ON(host
== NULL
);
619 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
621 virq
= irq_alloc_virt(host
, 1, 0);
622 if (virq
== NO_IRQ
) {
623 pr_debug("irq: create_direct virq allocation failed\n");
627 pr_debug("irq: create_direct obtained virq %d\n", virq
);
629 if (irq_setup_virq(host
, virq
, virq
))
635 unsigned int irq_create_mapping(struct irq_host
*host
,
636 irq_hw_number_t hwirq
)
638 unsigned int virq
, hint
;
640 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
642 /* Look for default host if nececssary */
644 host
= irq_default_host
;
646 printk(KERN_WARNING
"irq_create_mapping called for"
647 " NULL host, hwirq=%lx\n", hwirq
);
651 pr_debug("irq: -> using host @%p\n", host
);
653 /* Check if mapping already exist, if it does, call
654 * host->ops->map() to update the flags
656 virq
= irq_find_mapping(host
, hwirq
);
657 if (virq
!= NO_IRQ
) {
658 if (host
->ops
->remap
)
659 host
->ops
->remap(host
, virq
, hwirq
);
660 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
664 /* Get a virtual interrupt number */
665 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
667 virq
= (unsigned int)hwirq
;
668 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
672 /* Allocate a virtual interrupt number */
673 hint
= hwirq
% irq_virq_count
;
674 virq
= irq_alloc_virt(host
, 1, hint
);
675 if (virq
== NO_IRQ
) {
676 pr_debug("irq: -> virq allocation failed\n");
680 pr_debug("irq: -> obtained virq %d\n", virq
);
682 if (irq_setup_virq(host
, virq
, hwirq
))
687 EXPORT_SYMBOL_GPL(irq_create_mapping
);
689 unsigned int irq_create_of_mapping(struct device_node
*controller
,
690 u32
*intspec
, unsigned int intsize
)
692 struct irq_host
*host
;
693 irq_hw_number_t hwirq
;
694 unsigned int type
= IRQ_TYPE_NONE
;
697 if (controller
== NULL
)
698 host
= irq_default_host
;
700 host
= irq_find_host(controller
);
702 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
703 controller
->full_name
);
707 /* If host has no translation, then we assume interrupt line */
708 if (host
->ops
->xlate
== NULL
)
711 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
717 virq
= irq_create_mapping(host
, hwirq
);
721 /* Set type if specified and different than the current one */
722 if (type
!= IRQ_TYPE_NONE
&&
723 type
!= (get_irq_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
724 set_irq_type(virq
, type
);
727 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
729 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
733 if (of_irq_map_one(dev
, index
, &oirq
))
736 return irq_create_of_mapping(oirq
.controller
, oirq
.specifier
,
739 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
741 void irq_dispose_mapping(unsigned int virq
)
743 struct irq_host
*host
;
744 irq_hw_number_t hwirq
;
749 host
= irq_map
[virq
].host
;
750 WARN_ON (host
== NULL
);
754 /* Never unmap legacy interrupts */
755 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
758 /* remove chip and handler */
759 set_irq_chip_and_handler(virq
, NULL
, NULL
);
761 /* Make sure it's completed */
762 synchronize_irq(virq
);
764 /* Tell the PIC about it */
765 if (host
->ops
->unmap
)
766 host
->ops
->unmap(host
, virq
);
769 /* Clear reverse map */
770 hwirq
= irq_map
[virq
].hwirq
;
771 switch(host
->revmap_type
) {
772 case IRQ_HOST_MAP_LINEAR
:
773 if (hwirq
< host
->revmap_data
.linear
.size
)
774 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
776 case IRQ_HOST_MAP_TREE
:
778 * Check if radix tree allocated yet, if not then nothing to
782 if (revmap_trees_allocated
< 1)
784 mutex_lock(&revmap_trees_mutex
);
785 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
786 mutex_unlock(&revmap_trees_mutex
);
792 irq_map
[virq
].hwirq
= host
->inval_irq
;
795 get_irq_desc(virq
)->status
|= IRQ_NOREQUEST
;
798 irq_free_virt(virq
, 1);
800 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
802 unsigned int irq_find_mapping(struct irq_host
*host
,
803 irq_hw_number_t hwirq
)
806 unsigned int hint
= hwirq
% irq_virq_count
;
808 /* Look for default host if nececssary */
810 host
= irq_default_host
;
814 /* legacy -> bail early */
815 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
818 /* Slow path does a linear search of the map */
819 if (hint
< NUM_ISA_INTERRUPTS
)
820 hint
= NUM_ISA_INTERRUPTS
;
823 if (irq_map
[i
].host
== host
&&
824 irq_map
[i
].hwirq
== hwirq
)
827 if (i
>= irq_virq_count
)
828 i
= NUM_ISA_INTERRUPTS
;
832 EXPORT_SYMBOL_GPL(irq_find_mapping
);
835 unsigned int irq_radix_revmap_lookup(struct irq_host
*host
,
836 irq_hw_number_t hwirq
)
838 struct irq_map_entry
*ptr
;
841 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
844 * Check if the radix tree exists and has bee initialized.
845 * If not, we fallback to slow mode
847 if (revmap_trees_allocated
< 2)
848 return irq_find_mapping(host
, hwirq
);
850 /* Now try to resolve */
852 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
853 * as it's referencing an entry in the static irq_map table.
855 ptr
= radix_tree_lookup(&host
->revmap_data
.tree
, hwirq
);
858 * If found in radix tree, then fine.
859 * Else fallback to linear lookup - this should not happen in practice
860 * as it means that we failed to insert the node in the radix tree.
863 virq
= ptr
- irq_map
;
865 virq
= irq_find_mapping(host
, hwirq
);
870 void irq_radix_revmap_insert(struct irq_host
*host
, unsigned int virq
,
871 irq_hw_number_t hwirq
)
874 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
877 * Check if the radix tree exists yet.
878 * If not, then the irq will be inserted into the tree when it gets
882 if (revmap_trees_allocated
< 1)
885 if (virq
!= NO_IRQ
) {
886 mutex_lock(&revmap_trees_mutex
);
887 radix_tree_insert(&host
->revmap_data
.tree
, hwirq
,
889 mutex_unlock(&revmap_trees_mutex
);
893 unsigned int irq_linear_revmap(struct irq_host
*host
,
894 irq_hw_number_t hwirq
)
896 unsigned int *revmap
;
898 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
900 /* Check revmap bounds */
901 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
902 return irq_find_mapping(host
, hwirq
);
904 /* Check if revmap was allocated */
905 revmap
= host
->revmap_data
.linear
.revmap
;
906 if (unlikely(revmap
== NULL
))
907 return irq_find_mapping(host
, hwirq
);
909 /* Fill up revmap with slow path if no mapping found */
910 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
911 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
913 return revmap
[hwirq
];
916 unsigned int irq_alloc_virt(struct irq_host
*host
,
921 unsigned int i
, j
, found
= NO_IRQ
;
923 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
926 spin_lock_irqsave(&irq_big_lock
, flags
);
928 /* Use hint for 1 interrupt if any */
929 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
930 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
935 /* Look for count consecutive numbers in the allocatable
938 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
939 if (irq_map
[i
].host
!= NULL
)
945 found
= i
- count
+ 1;
949 if (found
== NO_IRQ
) {
950 spin_unlock_irqrestore(&irq_big_lock
, flags
);
954 for (i
= found
; i
< (found
+ count
); i
++) {
955 irq_map
[i
].hwirq
= host
->inval_irq
;
957 irq_map
[i
].host
= host
;
959 spin_unlock_irqrestore(&irq_big_lock
, flags
);
963 void irq_free_virt(unsigned int virq
, unsigned int count
)
968 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
969 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
971 spin_lock_irqsave(&irq_big_lock
, flags
);
972 for (i
= virq
; i
< (virq
+ count
); i
++) {
973 struct irq_host
*host
;
975 if (i
< NUM_ISA_INTERRUPTS
||
976 (virq
+ count
) > irq_virq_count
)
979 host
= irq_map
[i
].host
;
980 irq_map
[i
].hwirq
= host
->inval_irq
;
982 irq_map
[i
].host
= NULL
;
984 spin_unlock_irqrestore(&irq_big_lock
, flags
);
987 void irq_early_init(void)
991 for (i
= 0; i
< NR_IRQS
; i
++)
992 get_irq_desc(i
)->status
|= IRQ_NOREQUEST
;
995 /* We need to create the radix trees late */
996 static int irq_late_init(void)
1002 * No mutual exclusion with respect to accessors of the tree is needed
1003 * here as the synchronization is done via the state variable
1004 * revmap_trees_allocated.
1006 list_for_each_entry(h
, &irq_hosts
, link
) {
1007 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
1008 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_KERNEL
);
1012 * Make sure the radix trees inits are visible before setting
1016 revmap_trees_allocated
= 1;
1019 * Insert the reverse mapping for those interrupts already present
1022 mutex_lock(&revmap_trees_mutex
);
1023 for (i
= 0; i
< irq_virq_count
; i
++) {
1024 if (irq_map
[i
].host
&&
1025 (irq_map
[i
].host
->revmap_type
== IRQ_HOST_MAP_TREE
))
1026 radix_tree_insert(&irq_map
[i
].host
->revmap_data
.tree
,
1027 irq_map
[i
].hwirq
, &irq_map
[i
]);
1029 mutex_unlock(&revmap_trees_mutex
);
1032 * Make sure the radix trees insertions are visible before setting
1036 revmap_trees_allocated
= 2;
1040 arch_initcall(irq_late_init
);
1042 #ifdef CONFIG_VIRQ_DEBUG
1043 static int virq_debug_show(struct seq_file
*m
, void *private)
1045 unsigned long flags
;
1046 struct irq_desc
*desc
;
1048 char none
[] = "none";
1051 seq_printf(m
, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1052 "chip name", "host name");
1054 for (i
= 1; i
< NR_IRQS
; i
++) {
1055 desc
= get_irq_desc(i
);
1056 spin_lock_irqsave(&desc
->lock
, flags
);
1058 if (desc
->action
&& desc
->action
->handler
) {
1059 seq_printf(m
, "%5d ", i
);
1060 seq_printf(m
, "0x%05lx ", virq_to_hw(i
));
1062 if (desc
->chip
&& desc
->chip
->typename
)
1063 p
= desc
->chip
->typename
;
1066 seq_printf(m
, "%-15s ", p
);
1068 if (irq_map
[i
].host
&& irq_map
[i
].host
->of_node
)
1069 p
= irq_map
[i
].host
->of_node
->full_name
;
1072 seq_printf(m
, "%s\n", p
);
1075 spin_unlock_irqrestore(&desc
->lock
, flags
);
1081 static int virq_debug_open(struct inode
*inode
, struct file
*file
)
1083 return single_open(file
, virq_debug_show
, inode
->i_private
);
1086 static const struct file_operations virq_debug_fops
= {
1087 .open
= virq_debug_open
,
1089 .llseek
= seq_lseek
,
1090 .release
= single_release
,
1093 static int __init
irq_debugfs_init(void)
1095 if (debugfs_create_file("virq_mapping", S_IRUGO
, powerpc_debugfs_root
,
1096 NULL
, &virq_debug_fops
) == NULL
)
1101 __initcall(irq_debugfs_init
);
1102 #endif /* CONFIG_VIRQ_DEBUG */
1105 static int __init
setup_noirqdistrib(char *str
)
1107 distribute_irqs
= 0;
1111 __setup("noirqdistrib", setup_noirqdistrib
);
1112 #endif /* CONFIG_PPC64 */