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();
139 * if (get_paca()->hard_enabled) return;
140 * But again we need to take care that gcc gets hard_enabled directly
141 * via r13, not choose to use an intermediate register, lest we're
142 * preempted to a different cpu in between the two instructions.
144 if (get_hard_enabled())
148 * Need to hard-enable interrupts here. Since currently disabled,
149 * no need to take further asm precautions against preemption; but
150 * use local_paca instead of get_paca() to avoid preemption checking.
152 local_paca
->hard_enabled
= en
;
153 if ((int)mfspr(SPRN_DEC
) < 0)
157 * Force the delivery of pending soft-disabled interrupts on PS3.
158 * Any HV call will have this side effect.
160 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
162 lv1_get_version_info(&tmp
);
167 EXPORT_SYMBOL(raw_local_irq_restore
);
168 #endif /* CONFIG_PPC64 */
170 int show_interrupts(struct seq_file
*p
, void *v
)
172 int i
= *(loff_t
*)v
, j
;
173 struct irqaction
*action
;
179 for_each_online_cpu(j
)
180 seq_printf(p
, "CPU%d ", j
);
185 desc
= get_irq_desc(i
);
186 spin_lock_irqsave(&desc
->lock
, flags
);
187 action
= desc
->action
;
188 if (!action
|| !action
->handler
)
190 seq_printf(p
, "%3d: ", i
);
192 for_each_online_cpu(j
)
193 seq_printf(p
, "%10u ", kstat_cpu(j
).irqs
[i
]);
195 seq_printf(p
, "%10u ", kstat_irqs(i
));
196 #endif /* CONFIG_SMP */
198 seq_printf(p
, " %s ", desc
->chip
->typename
);
200 seq_puts(p
, " None ");
201 seq_printf(p
, "%s", (desc
->status
& IRQ_LEVEL
) ? "Level " : "Edge ");
202 seq_printf(p
, " %s", action
->name
);
203 for (action
= action
->next
; action
; action
= action
->next
)
204 seq_printf(p
, ", %s", action
->name
);
207 spin_unlock_irqrestore(&desc
->lock
, flags
);
208 } else if (i
== NR_IRQS
) {
209 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
210 if (tau_initialized
){
211 seq_puts(p
, "TAU: ");
212 for_each_online_cpu(j
)
213 seq_printf(p
, "%10u ", tau_interrupts(j
));
214 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
216 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT*/
217 seq_printf(p
, "BAD: %10u\n", ppc_spurious_interrupts
);
222 #ifdef CONFIG_HOTPLUG_CPU
223 void fixup_irqs(cpumask_t map
)
231 if (irq_desc
[irq
].status
& IRQ_PER_CPU
)
234 cpus_and(mask
, irq_desc
[irq
].affinity
, map
);
235 if (any_online_cpu(mask
) == NR_CPUS
) {
236 printk("Breaking affinity for irq %i\n", irq
);
239 if (irq_desc
[irq
].chip
->set_affinity
)
240 irq_desc
[irq
].chip
->set_affinity(irq
, mask
);
241 else if (irq_desc
[irq
].action
&& !(warned
++))
242 printk("Cannot set affinity for irq %i\n", irq
);
251 void do_IRQ(struct pt_regs
*regs
)
253 struct pt_regs
*old_regs
= set_irq_regs(regs
);
255 #ifdef CONFIG_IRQSTACKS
256 struct thread_info
*curtp
, *irqtp
;
261 #ifdef CONFIG_DEBUG_STACKOVERFLOW
262 /* Debugging check for stack overflow: is there less than 2KB free? */
266 sp
= __get_SP() & (THREAD_SIZE
-1);
268 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
269 printk("do_IRQ: stack overflow: %ld\n",
270 sp
- sizeof(struct thread_info
));
277 * Every platform is required to implement ppc_md.get_irq.
278 * This function will either return an irq number or NO_IRQ to
279 * indicate there are no more pending.
280 * The value NO_IRQ_IGNORE is for buggy hardware and means that this
281 * IRQ has already been handled. -- Tom
283 irq
= ppc_md
.get_irq();
285 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
) {
286 #ifdef CONFIG_IRQSTACKS
287 /* Switch to the irq stack to handle this */
288 curtp
= current_thread_info();
289 irqtp
= hardirq_ctx
[smp_processor_id()];
290 if (curtp
!= irqtp
) {
291 struct irq_desc
*desc
= irq_desc
+ irq
;
292 void *handler
= desc
->handle_irq
;
293 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
296 irqtp
->task
= curtp
->task
;
299 /* Copy the softirq bits in preempt_count so that the
300 * softirq checks work in the hardirq context.
302 irqtp
->preempt_count
=
303 (irqtp
->preempt_count
& ~SOFTIRQ_MASK
) |
304 (curtp
->preempt_count
& SOFTIRQ_MASK
);
306 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
307 _ALIGN_UP(sizeof(struct thread_info
), 16);
308 call_handle_irq(irq
, desc
, irqtp
, handler
);
309 current
->thread
.ksp_limit
= saved_sp_limit
;
313 /* Set any flag that may have been set on the
317 set_bits(irqtp
->flags
, &curtp
->flags
);
320 generic_handle_irq(irq
);
321 } else if (irq
!= NO_IRQ_IGNORE
)
322 /* That's not SMP safe ... but who cares ? */
323 ppc_spurious_interrupts
++;
326 set_irq_regs(old_regs
);
328 #ifdef CONFIG_PPC_ISERIES
329 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
330 get_lppaca()->int_dword
.fields
.decr_int
) {
331 get_lppaca()->int_dword
.fields
.decr_int
= 0;
332 /* Signal a fake decrementer interrupt */
333 timer_interrupt(regs
);
338 void __init
init_IRQ(void)
348 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
349 struct thread_info
*critirq_ctx
[NR_CPUS
] __read_mostly
;
350 struct thread_info
*dbgirq_ctx
[NR_CPUS
] __read_mostly
;
351 struct thread_info
*mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
353 void exc_lvl_ctx_init(void)
355 struct thread_info
*tp
;
358 for_each_possible_cpu(i
) {
359 memset((void *)critirq_ctx
[i
], 0, THREAD_SIZE
);
362 tp
->preempt_count
= 0;
365 memset((void *)dbgirq_ctx
[i
], 0, THREAD_SIZE
);
368 tp
->preempt_count
= 0;
370 memset((void *)mcheckirq_ctx
[i
], 0, THREAD_SIZE
);
371 tp
= mcheckirq_ctx
[i
];
373 tp
->preempt_count
= HARDIRQ_OFFSET
;
379 #ifdef CONFIG_IRQSTACKS
380 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
381 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
383 void irq_ctx_init(void)
385 struct thread_info
*tp
;
388 for_each_possible_cpu(i
) {
389 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
392 tp
->preempt_count
= 0;
394 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
397 tp
->preempt_count
= HARDIRQ_OFFSET
;
401 static inline void do_softirq_onstack(void)
403 struct thread_info
*curtp
, *irqtp
;
404 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
406 curtp
= current_thread_info();
407 irqtp
= softirq_ctx
[smp_processor_id()];
408 irqtp
->task
= curtp
->task
;
409 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
410 _ALIGN_UP(sizeof(struct thread_info
), 16);
411 call_do_softirq(irqtp
);
412 current
->thread
.ksp_limit
= saved_sp_limit
;
417 #define do_softirq_onstack() __do_softirq()
418 #endif /* CONFIG_IRQSTACKS */
420 void do_softirq(void)
427 local_irq_save(flags
);
429 if (local_softirq_pending())
430 do_softirq_onstack();
432 local_irq_restore(flags
);
437 * IRQ controller and virtual interrupts
440 static LIST_HEAD(irq_hosts
);
441 static DEFINE_SPINLOCK(irq_big_lock
);
442 static DEFINE_PER_CPU(unsigned int, irq_radix_reader
);
443 static unsigned int irq_radix_writer
;
444 static unsigned int revmap_trees_allocated
;
445 struct irq_map_entry irq_map
[NR_IRQS
];
446 static unsigned int irq_virq_count
= NR_IRQS
;
447 static struct irq_host
*irq_default_host
;
449 irq_hw_number_t
virq_to_hw(unsigned int virq
)
451 return irq_map
[virq
].hwirq
;
453 EXPORT_SYMBOL_GPL(virq_to_hw
);
455 static int default_irq_host_match(struct irq_host
*h
, struct device_node
*np
)
457 return h
->of_node
!= NULL
&& h
->of_node
== np
;
460 struct irq_host
*irq_alloc_host(struct device_node
*of_node
,
461 unsigned int revmap_type
,
462 unsigned int revmap_arg
,
463 struct irq_host_ops
*ops
,
464 irq_hw_number_t inval_irq
)
466 struct irq_host
*host
;
467 unsigned int size
= sizeof(struct irq_host
);
472 /* Allocate structure and revmap table if using linear mapping */
473 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
474 size
+= revmap_arg
* sizeof(unsigned int);
475 host
= zalloc_maybe_bootmem(size
, GFP_KERNEL
);
480 host
->revmap_type
= revmap_type
;
481 host
->inval_irq
= inval_irq
;
483 host
->of_node
= of_node_get(of_node
);
485 if (host
->ops
->match
== NULL
)
486 host
->ops
->match
= default_irq_host_match
;
488 spin_lock_irqsave(&irq_big_lock
, flags
);
490 /* If it's a legacy controller, check for duplicates and
491 * mark it as allocated (we use irq 0 host pointer for that
493 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
494 if (irq_map
[0].host
!= NULL
) {
495 spin_unlock_irqrestore(&irq_big_lock
, flags
);
496 /* If we are early boot, we can't free the structure,
498 * this will be fixed once slab is made available early
499 * instead of the current cruft
505 irq_map
[0].host
= host
;
508 list_add(&host
->link
, &irq_hosts
);
509 spin_unlock_irqrestore(&irq_big_lock
, flags
);
511 /* Additional setups per revmap type */
512 switch(revmap_type
) {
513 case IRQ_HOST_MAP_LEGACY
:
514 /* 0 is always the invalid number for legacy */
516 /* setup us as the host for all legacy interrupts */
517 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
518 irq_map
[i
].hwirq
= i
;
520 irq_map
[i
].host
= host
;
523 /* Clear norequest flags */
524 get_irq_desc(i
)->status
&= ~IRQ_NOREQUEST
;
526 /* Legacy flags are left to default at this point,
527 * one can then use irq_create_mapping() to
528 * explicitly change them
530 ops
->map(host
, i
, i
);
533 case IRQ_HOST_MAP_LINEAR
:
534 rmap
= (unsigned int *)(host
+ 1);
535 for (i
= 0; i
< revmap_arg
; i
++)
537 host
->revmap_data
.linear
.size
= revmap_arg
;
539 host
->revmap_data
.linear
.revmap
= rmap
;
545 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
550 struct irq_host
*irq_find_host(struct device_node
*node
)
552 struct irq_host
*h
, *found
= NULL
;
555 /* We might want to match the legacy controller last since
556 * it might potentially be set to match all interrupts in
557 * the absence of a device node. This isn't a problem so far
560 spin_lock_irqsave(&irq_big_lock
, flags
);
561 list_for_each_entry(h
, &irq_hosts
, link
)
562 if (h
->ops
->match(h
, node
)) {
566 spin_unlock_irqrestore(&irq_big_lock
, flags
);
569 EXPORT_SYMBOL_GPL(irq_find_host
);
571 void irq_set_default_host(struct irq_host
*host
)
573 pr_debug("irq: Default host set to @0x%p\n", host
);
575 irq_default_host
= host
;
578 void irq_set_virq_count(unsigned int count
)
580 pr_debug("irq: Trying to set virq count to %d\n", count
);
582 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
584 irq_virq_count
= count
;
587 /* radix tree not lockless safe ! we use a brlock-type mecanism
588 * for now, until we can use a lockless radix tree
590 static void irq_radix_wrlock(unsigned long *flags
)
592 unsigned int cpu
, ok
;
594 spin_lock_irqsave(&irq_big_lock
, *flags
);
595 irq_radix_writer
= 1;
600 for_each_possible_cpu(cpu
) {
601 if (per_cpu(irq_radix_reader
, cpu
)) {
611 static void irq_radix_wrunlock(unsigned long flags
)
614 irq_radix_writer
= 0;
615 spin_unlock_irqrestore(&irq_big_lock
, flags
);
618 static void irq_radix_rdlock(unsigned long *flags
)
620 local_irq_save(*flags
);
621 __get_cpu_var(irq_radix_reader
) = 1;
623 if (likely(irq_radix_writer
== 0))
625 __get_cpu_var(irq_radix_reader
) = 0;
627 spin_lock(&irq_big_lock
);
628 __get_cpu_var(irq_radix_reader
) = 1;
629 spin_unlock(&irq_big_lock
);
632 static void irq_radix_rdunlock(unsigned long flags
)
634 __get_cpu_var(irq_radix_reader
) = 0;
635 local_irq_restore(flags
);
638 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
639 irq_hw_number_t hwirq
)
641 /* Clear IRQ_NOREQUEST flag */
642 get_irq_desc(virq
)->status
&= ~IRQ_NOREQUEST
;
646 irq_map
[virq
].hwirq
= hwirq
;
649 if (host
->ops
->map(host
, virq
, hwirq
)) {
650 pr_debug("irq: -> mapping failed, freeing\n");
651 irq_free_virt(virq
, 1);
658 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
663 host
= irq_default_host
;
665 BUG_ON(host
== NULL
);
666 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
668 virq
= irq_alloc_virt(host
, 1, 0);
669 if (virq
== NO_IRQ
) {
670 pr_debug("irq: create_direct virq allocation failed\n");
674 pr_debug("irq: create_direct obtained virq %d\n", virq
);
676 if (irq_setup_virq(host
, virq
, virq
))
682 unsigned int irq_create_mapping(struct irq_host
*host
,
683 irq_hw_number_t hwirq
)
685 unsigned int virq
, hint
;
687 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
689 /* Look for default host if nececssary */
691 host
= irq_default_host
;
693 printk(KERN_WARNING
"irq_create_mapping called for"
694 " NULL host, hwirq=%lx\n", hwirq
);
698 pr_debug("irq: -> using host @%p\n", host
);
700 /* Check if mapping already exist, if it does, call
701 * host->ops->map() to update the flags
703 virq
= irq_find_mapping(host
, hwirq
);
704 if (virq
!= NO_IRQ
) {
705 if (host
->ops
->remap
)
706 host
->ops
->remap(host
, virq
, hwirq
);
707 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
711 /* Get a virtual interrupt number */
712 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
714 virq
= (unsigned int)hwirq
;
715 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
719 /* Allocate a virtual interrupt number */
720 hint
= hwirq
% irq_virq_count
;
721 virq
= irq_alloc_virt(host
, 1, hint
);
722 if (virq
== NO_IRQ
) {
723 pr_debug("irq: -> virq allocation failed\n");
727 pr_debug("irq: -> obtained virq %d\n", virq
);
729 if (irq_setup_virq(host
, virq
, hwirq
))
734 EXPORT_SYMBOL_GPL(irq_create_mapping
);
736 unsigned int irq_create_of_mapping(struct device_node
*controller
,
737 u32
*intspec
, unsigned int intsize
)
739 struct irq_host
*host
;
740 irq_hw_number_t hwirq
;
741 unsigned int type
= IRQ_TYPE_NONE
;
744 if (controller
== NULL
)
745 host
= irq_default_host
;
747 host
= irq_find_host(controller
);
749 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
750 controller
->full_name
);
754 /* If host has no translation, then we assume interrupt line */
755 if (host
->ops
->xlate
== NULL
)
758 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
764 virq
= irq_create_mapping(host
, hwirq
);
768 /* Set type if specified and different than the current one */
769 if (type
!= IRQ_TYPE_NONE
&&
770 type
!= (get_irq_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
771 set_irq_type(virq
, type
);
774 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
776 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
780 if (of_irq_map_one(dev
, index
, &oirq
))
783 return irq_create_of_mapping(oirq
.controller
, oirq
.specifier
,
786 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
788 void irq_dispose_mapping(unsigned int virq
)
790 struct irq_host
*host
;
791 irq_hw_number_t hwirq
;
797 host
= irq_map
[virq
].host
;
798 WARN_ON (host
== NULL
);
802 /* Never unmap legacy interrupts */
803 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
806 /* remove chip and handler */
807 set_irq_chip_and_handler(virq
, NULL
, NULL
);
809 /* Make sure it's completed */
810 synchronize_irq(virq
);
812 /* Tell the PIC about it */
813 if (host
->ops
->unmap
)
814 host
->ops
->unmap(host
, virq
);
817 /* Clear reverse map */
818 hwirq
= irq_map
[virq
].hwirq
;
819 switch(host
->revmap_type
) {
820 case IRQ_HOST_MAP_LINEAR
:
821 if (hwirq
< host
->revmap_data
.linear
.size
)
822 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
824 case IRQ_HOST_MAP_TREE
:
826 * Check if radix tree allocated yet, if not then nothing to
830 if (revmap_trees_allocated
< 1)
832 irq_radix_wrlock(&flags
);
833 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
834 irq_radix_wrunlock(flags
);
840 irq_map
[virq
].hwirq
= host
->inval_irq
;
843 get_irq_desc(virq
)->status
|= IRQ_NOREQUEST
;
846 irq_free_virt(virq
, 1);
848 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
850 unsigned int irq_find_mapping(struct irq_host
*host
,
851 irq_hw_number_t hwirq
)
854 unsigned int hint
= hwirq
% irq_virq_count
;
856 /* Look for default host if nececssary */
858 host
= irq_default_host
;
862 /* legacy -> bail early */
863 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
866 /* Slow path does a linear search of the map */
867 if (hint
< NUM_ISA_INTERRUPTS
)
868 hint
= NUM_ISA_INTERRUPTS
;
871 if (irq_map
[i
].host
== host
&&
872 irq_map
[i
].hwirq
== hwirq
)
875 if (i
>= irq_virq_count
)
876 i
= NUM_ISA_INTERRUPTS
;
880 EXPORT_SYMBOL_GPL(irq_find_mapping
);
883 unsigned int irq_radix_revmap_lookup(struct irq_host
*host
,
884 irq_hw_number_t hwirq
)
886 struct irq_map_entry
*ptr
;
890 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
893 * Check if the radix tree exists and has bee initialized.
894 * If not, we fallback to slow mode
896 if (revmap_trees_allocated
< 2)
897 return irq_find_mapping(host
, hwirq
);
899 /* Now try to resolve */
900 irq_radix_rdlock(&flags
);
901 ptr
= radix_tree_lookup(&host
->revmap_data
.tree
, hwirq
);
902 irq_radix_rdunlock(flags
);
905 * If found in radix tree, then fine.
906 * Else fallback to linear lookup - this should not happen in practice
907 * as it means that we failed to insert the node in the radix tree.
910 virq
= ptr
- irq_map
;
912 virq
= irq_find_mapping(host
, hwirq
);
917 void irq_radix_revmap_insert(struct irq_host
*host
, unsigned int virq
,
918 irq_hw_number_t hwirq
)
922 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
925 * Check if the radix tree exists yet.
926 * If not, then the irq will be inserted into the tree when it gets
930 if (revmap_trees_allocated
< 1)
933 if (virq
!= NO_IRQ
) {
934 irq_radix_wrlock(&flags
);
935 radix_tree_insert(&host
->revmap_data
.tree
, hwirq
,
937 irq_radix_wrunlock(flags
);
941 unsigned int irq_linear_revmap(struct irq_host
*host
,
942 irq_hw_number_t hwirq
)
944 unsigned int *revmap
;
946 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
948 /* Check revmap bounds */
949 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
950 return irq_find_mapping(host
, hwirq
);
952 /* Check if revmap was allocated */
953 revmap
= host
->revmap_data
.linear
.revmap
;
954 if (unlikely(revmap
== NULL
))
955 return irq_find_mapping(host
, hwirq
);
957 /* Fill up revmap with slow path if no mapping found */
958 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
959 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
961 return revmap
[hwirq
];
964 unsigned int irq_alloc_virt(struct irq_host
*host
,
969 unsigned int i
, j
, found
= NO_IRQ
;
971 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
974 spin_lock_irqsave(&irq_big_lock
, flags
);
976 /* Use hint for 1 interrupt if any */
977 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
978 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
983 /* Look for count consecutive numbers in the allocatable
986 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
987 if (irq_map
[i
].host
!= NULL
)
993 found
= i
- count
+ 1;
997 if (found
== NO_IRQ
) {
998 spin_unlock_irqrestore(&irq_big_lock
, flags
);
1002 for (i
= found
; i
< (found
+ count
); i
++) {
1003 irq_map
[i
].hwirq
= host
->inval_irq
;
1005 irq_map
[i
].host
= host
;
1007 spin_unlock_irqrestore(&irq_big_lock
, flags
);
1011 void irq_free_virt(unsigned int virq
, unsigned int count
)
1013 unsigned long flags
;
1016 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
1017 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
1019 spin_lock_irqsave(&irq_big_lock
, flags
);
1020 for (i
= virq
; i
< (virq
+ count
); i
++) {
1021 struct irq_host
*host
;
1023 if (i
< NUM_ISA_INTERRUPTS
||
1024 (virq
+ count
) > irq_virq_count
)
1027 host
= irq_map
[i
].host
;
1028 irq_map
[i
].hwirq
= host
->inval_irq
;
1030 irq_map
[i
].host
= NULL
;
1032 spin_unlock_irqrestore(&irq_big_lock
, flags
);
1035 void irq_early_init(void)
1039 for (i
= 0; i
< NR_IRQS
; i
++)
1040 get_irq_desc(i
)->status
|= IRQ_NOREQUEST
;
1043 /* We need to create the radix trees late */
1044 static int irq_late_init(void)
1047 unsigned long flags
;
1051 * No mutual exclusion with respect to accessors of the tree is needed
1052 * here as the synchronization is done via the state variable
1053 * revmap_trees_allocated.
1055 list_for_each_entry(h
, &irq_hosts
, link
) {
1056 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
1057 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_KERNEL
);
1061 * Make sure the radix trees inits are visible before setting
1065 revmap_trees_allocated
= 1;
1068 * Insert the reverse mapping for those interrupts already present
1071 irq_radix_wrlock(&flags
);
1072 for (i
= 0; i
< irq_virq_count
; i
++) {
1073 if (irq_map
[i
].host
&&
1074 (irq_map
[i
].host
->revmap_type
== IRQ_HOST_MAP_TREE
))
1075 radix_tree_insert(&irq_map
[i
].host
->revmap_data
.tree
,
1076 irq_map
[i
].hwirq
, &irq_map
[i
]);
1078 irq_radix_wrunlock(flags
);
1081 * Make sure the radix trees insertions are visible before setting
1085 revmap_trees_allocated
= 2;
1089 arch_initcall(irq_late_init
);
1091 #ifdef CONFIG_VIRQ_DEBUG
1092 static int virq_debug_show(struct seq_file
*m
, void *private)
1094 unsigned long flags
;
1097 char none
[] = "none";
1100 seq_printf(m
, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1101 "chip name", "host name");
1103 for (i
= 1; i
< NR_IRQS
; i
++) {
1104 desc
= get_irq_desc(i
);
1105 spin_lock_irqsave(&desc
->lock
, flags
);
1107 if (desc
->action
&& desc
->action
->handler
) {
1108 seq_printf(m
, "%5d ", i
);
1109 seq_printf(m
, "0x%05lx ", virq_to_hw(i
));
1111 if (desc
->chip
&& desc
->chip
->typename
)
1112 p
= desc
->chip
->typename
;
1115 seq_printf(m
, "%-15s ", p
);
1117 if (irq_map
[i
].host
&& irq_map
[i
].host
->of_node
)
1118 p
= irq_map
[i
].host
->of_node
->full_name
;
1121 seq_printf(m
, "%s\n", p
);
1124 spin_unlock_irqrestore(&desc
->lock
, flags
);
1130 static int virq_debug_open(struct inode
*inode
, struct file
*file
)
1132 return single_open(file
, virq_debug_show
, inode
->i_private
);
1135 static const struct file_operations virq_debug_fops
= {
1136 .open
= virq_debug_open
,
1138 .llseek
= seq_lseek
,
1139 .release
= single_release
,
1142 static int __init
irq_debugfs_init(void)
1144 if (debugfs_create_file("virq_mapping", S_IRUGO
, powerpc_debugfs_root
,
1145 NULL
, &virq_debug_fops
) == NULL
)
1150 __initcall(irq_debugfs_init
);
1151 #endif /* CONFIG_VIRQ_DEBUG */
1154 static int __init
setup_noirqdistrib(char *str
)
1156 distribute_irqs
= 0;
1160 __setup("noirqdistrib", setup_noirqdistrib
);
1161 #endif /* CONFIG_PPC64 */