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 <linux/of_irq.h>
59 #include <asm/uaccess.h>
60 #include <asm/system.h>
62 #include <asm/pgtable.h>
64 #include <asm/cache.h>
66 #include <asm/ptrace.h>
67 #include <asm/machdep.h>
69 #include <asm/dbell.h>
73 #include <asm/firmware.h>
74 #include <asm/lv1call.h>
76 #define CREATE_TRACE_POINTS
77 #include <asm/trace.h>
79 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t
, irq_stat
);
80 EXPORT_PER_CPU_SYMBOL(irq_stat
);
82 int __irq_offset_value
;
85 EXPORT_SYMBOL(__irq_offset_value
);
86 atomic_t ppc_n_lost_interrupts
;
89 extern int tau_initialized
;
90 extern int tau_interrupts(int);
92 #endif /* CONFIG_PPC32 */
96 #ifndef CONFIG_SPARSE_IRQ
97 EXPORT_SYMBOL(irq_desc
);
100 int distribute_irqs
= 1;
102 static inline notrace
unsigned long get_hard_enabled(void)
104 unsigned long enabled
;
106 __asm__
__volatile__("lbz %0,%1(13)"
107 : "=r" (enabled
) : "i" (offsetof(struct paca_struct
, hard_enabled
)));
112 static inline notrace
void set_soft_enabled(unsigned long enable
)
114 __asm__
__volatile__("stb %0,%1(13)"
115 : : "r" (enable
), "i" (offsetof(struct paca_struct
, soft_enabled
)));
118 notrace
void raw_local_irq_restore(unsigned long en
)
121 * get_paca()->soft_enabled = en;
122 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
123 * That was allowed before, and in such a case we do need to take care
124 * that gcc will set soft_enabled directly via r13, not choose to use
125 * an intermediate register, lest we're preempted to a different cpu.
127 set_soft_enabled(en
);
131 #ifdef CONFIG_PPC_STD_MMU_64
132 if (firmware_has_feature(FW_FEATURE_ISERIES
)) {
134 * Do we need to disable preemption here? Not really: in the
135 * unlikely event that we're preempted to a different cpu in
136 * between getting r13, loading its lppaca_ptr, and loading
137 * its any_int, we might call iseries_handle_interrupts without
138 * an interrupt pending on the new cpu, but that's no disaster,
139 * is it? And the business of preempting us off the old cpu
140 * would itself involve a local_irq_restore which handles the
141 * interrupt to that cpu.
143 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
144 * to avoid any preemption checking added into get_paca().
146 if (local_paca
->lppaca_ptr
->int_dword
.any_int
)
147 iseries_handle_interrupts();
149 #endif /* CONFIG_PPC_STD_MMU_64 */
152 * if (get_paca()->hard_enabled) return;
153 * But again we need to take care that gcc gets hard_enabled directly
154 * via r13, not choose to use an intermediate register, lest we're
155 * preempted to a different cpu in between the two instructions.
157 if (get_hard_enabled())
160 #if defined(CONFIG_BOOKE) && defined(CONFIG_SMP)
161 /* Check for pending doorbell interrupts and resend to ourself */
162 doorbell_check_self();
166 * Need to hard-enable interrupts here. Since currently disabled,
167 * no need to take further asm precautions against preemption; but
168 * use local_paca instead of get_paca() to avoid preemption checking.
170 local_paca
->hard_enabled
= en
;
173 /* On server, re-trigger the decrementer if it went negative since
174 * some processors only trigger on edge transitions of the sign bit.
176 * BookE has a level sensitive decrementer (latches in TSR) so we
179 if ((int)mfspr(SPRN_DEC
) < 0)
181 #endif /* CONFIG_BOOKE */
184 * Force the delivery of pending soft-disabled interrupts on PS3.
185 * Any HV call will have this side effect.
187 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
189 lv1_get_version_info(&tmp
);
194 EXPORT_SYMBOL(raw_local_irq_restore
);
195 #endif /* CONFIG_PPC64 */
197 static int show_other_interrupts(struct seq_file
*p
, int prec
)
201 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
202 if (tau_initialized
) {
203 seq_printf(p
, "%*s: ", prec
, "TAU");
204 for_each_online_cpu(j
)
205 seq_printf(p
, "%10u ", tau_interrupts(j
));
206 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
208 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
210 seq_printf(p
, "%*s: ", prec
, "LOC");
211 for_each_online_cpu(j
)
212 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).timer_irqs
);
213 seq_printf(p
, " Local timer interrupts\n");
215 seq_printf(p
, "%*s: ", prec
, "SPU");
216 for_each_online_cpu(j
)
217 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).spurious_irqs
);
218 seq_printf(p
, " Spurious interrupts\n");
220 seq_printf(p
, "%*s: ", prec
, "CNT");
221 for_each_online_cpu(j
)
222 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).pmu_irqs
);
223 seq_printf(p
, " Performance monitoring interrupts\n");
225 seq_printf(p
, "%*s: ", prec
, "MCE");
226 for_each_online_cpu(j
)
227 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).mce_exceptions
);
228 seq_printf(p
, " Machine check exceptions\n");
233 int show_interrupts(struct seq_file
*p
, void *v
)
235 unsigned long flags
, any_count
= 0;
236 int i
= *(loff_t
*) v
, j
, prec
;
237 struct irqaction
*action
;
238 struct irq_desc
*desc
;
243 for (prec
= 3, j
= 1000; prec
< 10 && j
<= nr_irqs
; ++prec
)
247 return show_other_interrupts(p
, prec
);
251 seq_printf(p
, "%*s", prec
+ 8, "");
252 for_each_online_cpu(j
)
253 seq_printf(p
, "CPU%-8d", j
);
257 desc
= irq_to_desc(i
);
261 raw_spin_lock_irqsave(&desc
->lock
, flags
);
262 for_each_online_cpu(j
)
263 any_count
|= kstat_irqs_cpu(i
, j
);
264 action
= desc
->action
;
265 if (!action
&& !any_count
)
268 seq_printf(p
, "%*d: ", prec
, i
);
269 for_each_online_cpu(j
)
270 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
273 seq_printf(p
, " %-16s", desc
->chip
->name
);
275 seq_printf(p
, " %-16s", "None");
276 seq_printf(p
, " %-8s", (desc
->status
& IRQ_LEVEL
) ? "Level" : "Edge");
279 seq_printf(p
, " %s", action
->name
);
280 while ((action
= action
->next
) != NULL
)
281 seq_printf(p
, ", %s", action
->name
);
286 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
293 u64
arch_irq_stat_cpu(unsigned int cpu
)
295 u64 sum
= per_cpu(irq_stat
, cpu
).timer_irqs
;
297 sum
+= per_cpu(irq_stat
, cpu
).pmu_irqs
;
298 sum
+= per_cpu(irq_stat
, cpu
).mce_exceptions
;
299 sum
+= per_cpu(irq_stat
, cpu
).spurious_irqs
;
304 #ifdef CONFIG_HOTPLUG_CPU
305 void fixup_irqs(const struct cpumask
*map
)
307 struct irq_desc
*desc
;
312 alloc_cpumask_var(&mask
, GFP_KERNEL
);
315 desc
= irq_to_desc(irq
);
319 if (desc
->status
& IRQ_PER_CPU
)
322 cpumask_and(mask
, desc
->affinity
, map
);
323 if (cpumask_any(mask
) >= nr_cpu_ids
) {
324 printk("Breaking affinity for irq %i\n", irq
);
325 cpumask_copy(mask
, map
);
327 if (desc
->chip
->set_affinity
)
328 desc
->chip
->set_affinity(irq
, mask
);
329 else if (desc
->action
&& !(warned
++))
330 printk("Cannot set affinity for irq %i\n", irq
);
333 free_cpumask_var(mask
);
341 static inline void handle_one_irq(unsigned int irq
)
343 struct thread_info
*curtp
, *irqtp
;
344 unsigned long saved_sp_limit
;
345 struct irq_desc
*desc
;
347 /* Switch to the irq stack to handle this */
348 curtp
= current_thread_info();
349 irqtp
= hardirq_ctx
[smp_processor_id()];
351 if (curtp
== irqtp
) {
352 /* We're already on the irq stack, just handle it */
353 generic_handle_irq(irq
);
357 desc
= irq_to_desc(irq
);
358 saved_sp_limit
= current
->thread
.ksp_limit
;
360 irqtp
->task
= curtp
->task
;
363 /* Copy the softirq bits in preempt_count so that the
364 * softirq checks work in the hardirq context. */
365 irqtp
->preempt_count
= (irqtp
->preempt_count
& ~SOFTIRQ_MASK
) |
366 (curtp
->preempt_count
& SOFTIRQ_MASK
);
368 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
369 _ALIGN_UP(sizeof(struct thread_info
), 16);
371 call_handle_irq(irq
, desc
, irqtp
, desc
->handle_irq
);
372 current
->thread
.ksp_limit
= saved_sp_limit
;
375 /* Set any flag that may have been set on the
379 set_bits(irqtp
->flags
, &curtp
->flags
);
382 static inline void check_stack_overflow(void)
384 #ifdef CONFIG_DEBUG_STACKOVERFLOW
387 sp
= __get_SP() & (THREAD_SIZE
-1);
389 /* check for stack overflow: is there less than 2KB free? */
390 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
391 printk("do_IRQ: stack overflow: %ld\n",
392 sp
- sizeof(struct thread_info
));
398 void do_IRQ(struct pt_regs
*regs
)
400 struct pt_regs
*old_regs
= set_irq_regs(regs
);
403 trace_irq_entry(regs
);
407 check_stack_overflow();
409 irq
= ppc_md
.get_irq();
411 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
)
413 else if (irq
!= NO_IRQ_IGNORE
)
414 __get_cpu_var(irq_stat
).spurious_irqs
++;
417 set_irq_regs(old_regs
);
419 #ifdef CONFIG_PPC_ISERIES
420 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
421 get_lppaca()->int_dword
.fields
.decr_int
) {
422 get_lppaca()->int_dword
.fields
.decr_int
= 0;
423 /* Signal a fake decrementer interrupt */
424 timer_interrupt(regs
);
428 trace_irq_exit(regs
);
431 void __init
init_IRQ(void)
441 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
442 struct thread_info
*critirq_ctx
[NR_CPUS
] __read_mostly
;
443 struct thread_info
*dbgirq_ctx
[NR_CPUS
] __read_mostly
;
444 struct thread_info
*mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
446 void exc_lvl_ctx_init(void)
448 struct thread_info
*tp
;
451 for_each_possible_cpu(i
) {
452 memset((void *)critirq_ctx
[i
], 0, THREAD_SIZE
);
455 tp
->preempt_count
= 0;
458 memset((void *)dbgirq_ctx
[i
], 0, THREAD_SIZE
);
461 tp
->preempt_count
= 0;
463 memset((void *)mcheckirq_ctx
[i
], 0, THREAD_SIZE
);
464 tp
= mcheckirq_ctx
[i
];
466 tp
->preempt_count
= HARDIRQ_OFFSET
;
472 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
473 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
475 void irq_ctx_init(void)
477 struct thread_info
*tp
;
480 for_each_possible_cpu(i
) {
481 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
484 tp
->preempt_count
= 0;
486 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
489 tp
->preempt_count
= HARDIRQ_OFFSET
;
493 static inline void do_softirq_onstack(void)
495 struct thread_info
*curtp
, *irqtp
;
496 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
498 curtp
= current_thread_info();
499 irqtp
= softirq_ctx
[smp_processor_id()];
500 irqtp
->task
= curtp
->task
;
501 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
502 _ALIGN_UP(sizeof(struct thread_info
), 16);
503 call_do_softirq(irqtp
);
504 current
->thread
.ksp_limit
= saved_sp_limit
;
508 void do_softirq(void)
515 local_irq_save(flags
);
517 if (local_softirq_pending())
518 do_softirq_onstack();
520 local_irq_restore(flags
);
525 * IRQ controller and virtual interrupts
528 static LIST_HEAD(irq_hosts
);
529 static DEFINE_RAW_SPINLOCK(irq_big_lock
);
530 static unsigned int revmap_trees_allocated
;
531 static DEFINE_MUTEX(revmap_trees_mutex
);
532 struct irq_map_entry irq_map
[NR_IRQS
];
533 static unsigned int irq_virq_count
= NR_IRQS
;
534 static struct irq_host
*irq_default_host
;
536 irq_hw_number_t
virq_to_hw(unsigned int virq
)
538 return irq_map
[virq
].hwirq
;
540 EXPORT_SYMBOL_GPL(virq_to_hw
);
542 static int default_irq_host_match(struct irq_host
*h
, struct device_node
*np
)
544 return h
->of_node
!= NULL
&& h
->of_node
== np
;
547 struct irq_host
*irq_alloc_host(struct device_node
*of_node
,
548 unsigned int revmap_type
,
549 unsigned int revmap_arg
,
550 struct irq_host_ops
*ops
,
551 irq_hw_number_t inval_irq
)
553 struct irq_host
*host
;
554 unsigned int size
= sizeof(struct irq_host
);
559 /* Allocate structure and revmap table if using linear mapping */
560 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
561 size
+= revmap_arg
* sizeof(unsigned int);
562 host
= zalloc_maybe_bootmem(size
, GFP_KERNEL
);
567 host
->revmap_type
= revmap_type
;
568 host
->inval_irq
= inval_irq
;
570 host
->of_node
= of_node_get(of_node
);
572 if (host
->ops
->match
== NULL
)
573 host
->ops
->match
= default_irq_host_match
;
575 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
577 /* If it's a legacy controller, check for duplicates and
578 * mark it as allocated (we use irq 0 host pointer for that
580 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
581 if (irq_map
[0].host
!= NULL
) {
582 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
583 /* If we are early boot, we can't free the structure,
585 * this will be fixed once slab is made available early
586 * instead of the current cruft
592 irq_map
[0].host
= host
;
595 list_add(&host
->link
, &irq_hosts
);
596 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
598 /* Additional setups per revmap type */
599 switch(revmap_type
) {
600 case IRQ_HOST_MAP_LEGACY
:
601 /* 0 is always the invalid number for legacy */
603 /* setup us as the host for all legacy interrupts */
604 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
605 irq_map
[i
].hwirq
= i
;
607 irq_map
[i
].host
= host
;
610 /* Clear norequest flags */
611 irq_to_desc(i
)->status
&= ~IRQ_NOREQUEST
;
613 /* Legacy flags are left to default at this point,
614 * one can then use irq_create_mapping() to
615 * explicitly change them
617 ops
->map(host
, i
, i
);
620 case IRQ_HOST_MAP_LINEAR
:
621 rmap
= (unsigned int *)(host
+ 1);
622 for (i
= 0; i
< revmap_arg
; i
++)
624 host
->revmap_data
.linear
.size
= revmap_arg
;
626 host
->revmap_data
.linear
.revmap
= rmap
;
632 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
637 struct irq_host
*irq_find_host(struct device_node
*node
)
639 struct irq_host
*h
, *found
= NULL
;
642 /* We might want to match the legacy controller last since
643 * it might potentially be set to match all interrupts in
644 * the absence of a device node. This isn't a problem so far
647 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
648 list_for_each_entry(h
, &irq_hosts
, link
)
649 if (h
->ops
->match(h
, node
)) {
653 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
656 EXPORT_SYMBOL_GPL(irq_find_host
);
658 void irq_set_default_host(struct irq_host
*host
)
660 pr_debug("irq: Default host set to @0x%p\n", host
);
662 irq_default_host
= host
;
665 void irq_set_virq_count(unsigned int count
)
667 pr_debug("irq: Trying to set virq count to %d\n", count
);
669 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
671 irq_virq_count
= count
;
674 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
675 irq_hw_number_t hwirq
)
677 struct irq_desc
*desc
;
679 desc
= irq_to_desc_alloc_node(virq
, 0);
681 pr_debug("irq: -> allocating desc failed\n");
685 /* Clear IRQ_NOREQUEST flag */
686 desc
->status
&= ~IRQ_NOREQUEST
;
690 irq_map
[virq
].hwirq
= hwirq
;
693 if (host
->ops
->map(host
, virq
, hwirq
)) {
694 pr_debug("irq: -> mapping failed, freeing\n");
701 irq_free_virt(virq
, 1);
705 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
710 host
= irq_default_host
;
712 BUG_ON(host
== NULL
);
713 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
715 virq
= irq_alloc_virt(host
, 1, 0);
716 if (virq
== NO_IRQ
) {
717 pr_debug("irq: create_direct virq allocation failed\n");
721 pr_debug("irq: create_direct obtained virq %d\n", virq
);
723 if (irq_setup_virq(host
, virq
, virq
))
729 unsigned int irq_create_mapping(struct irq_host
*host
,
730 irq_hw_number_t hwirq
)
732 unsigned int virq
, hint
;
734 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
736 /* Look for default host if nececssary */
738 host
= irq_default_host
;
740 printk(KERN_WARNING
"irq_create_mapping called for"
741 " NULL host, hwirq=%lx\n", hwirq
);
745 pr_debug("irq: -> using host @%p\n", host
);
747 /* Check if mapping already exist, if it does, call
748 * host->ops->map() to update the flags
750 virq
= irq_find_mapping(host
, hwirq
);
751 if (virq
!= NO_IRQ
) {
752 if (host
->ops
->remap
)
753 host
->ops
->remap(host
, virq
, hwirq
);
754 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
758 /* Get a virtual interrupt number */
759 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
761 virq
= (unsigned int)hwirq
;
762 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
766 /* Allocate a virtual interrupt number */
767 hint
= hwirq
% irq_virq_count
;
768 virq
= irq_alloc_virt(host
, 1, hint
);
769 if (virq
== NO_IRQ
) {
770 pr_debug("irq: -> virq allocation failed\n");
775 if (irq_setup_virq(host
, virq
, hwirq
))
778 printk(KERN_DEBUG
"irq: irq %lu on host %s mapped to virtual irq %u\n",
779 hwirq
, host
->of_node
? host
->of_node
->full_name
: "null", virq
);
783 EXPORT_SYMBOL_GPL(irq_create_mapping
);
785 unsigned int irq_create_of_mapping(struct device_node
*controller
,
786 const u32
*intspec
, unsigned int intsize
)
788 struct irq_host
*host
;
789 irq_hw_number_t hwirq
;
790 unsigned int type
= IRQ_TYPE_NONE
;
793 if (controller
== NULL
)
794 host
= irq_default_host
;
796 host
= irq_find_host(controller
);
798 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
799 controller
->full_name
);
803 /* If host has no translation, then we assume interrupt line */
804 if (host
->ops
->xlate
== NULL
)
807 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
813 virq
= irq_create_mapping(host
, hwirq
);
817 /* Set type if specified and different than the current one */
818 if (type
!= IRQ_TYPE_NONE
&&
819 type
!= (irq_to_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
820 set_irq_type(virq
, type
);
823 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
825 void irq_dispose_mapping(unsigned int virq
)
827 struct irq_host
*host
;
828 irq_hw_number_t hwirq
;
833 host
= irq_map
[virq
].host
;
834 WARN_ON (host
== NULL
);
838 /* Never unmap legacy interrupts */
839 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
842 /* remove chip and handler */
843 set_irq_chip_and_handler(virq
, NULL
, NULL
);
845 /* Make sure it's completed */
846 synchronize_irq(virq
);
848 /* Tell the PIC about it */
849 if (host
->ops
->unmap
)
850 host
->ops
->unmap(host
, virq
);
853 /* Clear reverse map */
854 hwirq
= irq_map
[virq
].hwirq
;
855 switch(host
->revmap_type
) {
856 case IRQ_HOST_MAP_LINEAR
:
857 if (hwirq
< host
->revmap_data
.linear
.size
)
858 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
860 case IRQ_HOST_MAP_TREE
:
862 * Check if radix tree allocated yet, if not then nothing to
866 if (revmap_trees_allocated
< 1)
868 mutex_lock(&revmap_trees_mutex
);
869 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
870 mutex_unlock(&revmap_trees_mutex
);
876 irq_map
[virq
].hwirq
= host
->inval_irq
;
879 irq_to_desc(virq
)->status
|= IRQ_NOREQUEST
;
882 irq_free_virt(virq
, 1);
884 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
886 unsigned int irq_find_mapping(struct irq_host
*host
,
887 irq_hw_number_t hwirq
)
890 unsigned int hint
= hwirq
% irq_virq_count
;
892 /* Look for default host if nececssary */
894 host
= irq_default_host
;
898 /* legacy -> bail early */
899 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
902 /* Slow path does a linear search of the map */
903 if (hint
< NUM_ISA_INTERRUPTS
)
904 hint
= NUM_ISA_INTERRUPTS
;
907 if (irq_map
[i
].host
== host
&&
908 irq_map
[i
].hwirq
== hwirq
)
911 if (i
>= irq_virq_count
)
912 i
= NUM_ISA_INTERRUPTS
;
916 EXPORT_SYMBOL_GPL(irq_find_mapping
);
919 unsigned int irq_radix_revmap_lookup(struct irq_host
*host
,
920 irq_hw_number_t hwirq
)
922 struct irq_map_entry
*ptr
;
925 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
928 * Check if the radix tree exists and has bee initialized.
929 * If not, we fallback to slow mode
931 if (revmap_trees_allocated
< 2)
932 return irq_find_mapping(host
, hwirq
);
934 /* Now try to resolve */
936 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
937 * as it's referencing an entry in the static irq_map table.
939 ptr
= radix_tree_lookup(&host
->revmap_data
.tree
, hwirq
);
942 * If found in radix tree, then fine.
943 * Else fallback to linear lookup - this should not happen in practice
944 * as it means that we failed to insert the node in the radix tree.
947 virq
= ptr
- irq_map
;
949 virq
= irq_find_mapping(host
, hwirq
);
954 void irq_radix_revmap_insert(struct irq_host
*host
, unsigned int virq
,
955 irq_hw_number_t hwirq
)
958 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
961 * Check if the radix tree exists yet.
962 * If not, then the irq will be inserted into the tree when it gets
966 if (revmap_trees_allocated
< 1)
969 if (virq
!= NO_IRQ
) {
970 mutex_lock(&revmap_trees_mutex
);
971 radix_tree_insert(&host
->revmap_data
.tree
, hwirq
,
973 mutex_unlock(&revmap_trees_mutex
);
977 unsigned int irq_linear_revmap(struct irq_host
*host
,
978 irq_hw_number_t hwirq
)
980 unsigned int *revmap
;
982 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
984 /* Check revmap bounds */
985 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
986 return irq_find_mapping(host
, hwirq
);
988 /* Check if revmap was allocated */
989 revmap
= host
->revmap_data
.linear
.revmap
;
990 if (unlikely(revmap
== NULL
))
991 return irq_find_mapping(host
, hwirq
);
993 /* Fill up revmap with slow path if no mapping found */
994 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
995 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
997 return revmap
[hwirq
];
1000 unsigned int irq_alloc_virt(struct irq_host
*host
,
1004 unsigned long flags
;
1005 unsigned int i
, j
, found
= NO_IRQ
;
1007 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
1010 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
1012 /* Use hint for 1 interrupt if any */
1013 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
1014 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
1019 /* Look for count consecutive numbers in the allocatable
1020 * (non-legacy) space
1022 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
1023 if (irq_map
[i
].host
!= NULL
)
1029 found
= i
- count
+ 1;
1033 if (found
== NO_IRQ
) {
1034 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
1038 for (i
= found
; i
< (found
+ count
); i
++) {
1039 irq_map
[i
].hwirq
= host
->inval_irq
;
1041 irq_map
[i
].host
= host
;
1043 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
1047 void irq_free_virt(unsigned int virq
, unsigned int count
)
1049 unsigned long flags
;
1052 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
1053 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
1055 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
1056 for (i
= virq
; i
< (virq
+ count
); i
++) {
1057 struct irq_host
*host
;
1059 if (i
< NUM_ISA_INTERRUPTS
||
1060 (virq
+ count
) > irq_virq_count
)
1063 host
= irq_map
[i
].host
;
1064 irq_map
[i
].hwirq
= host
->inval_irq
;
1066 irq_map
[i
].host
= NULL
;
1068 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
1071 int arch_early_irq_init(void)
1073 struct irq_desc
*desc
;
1076 for (i
= 0; i
< NR_IRQS
; i
++) {
1077 desc
= irq_to_desc(i
);
1079 desc
->status
|= IRQ_NOREQUEST
;
1085 int arch_init_chip_data(struct irq_desc
*desc
, int node
)
1087 desc
->status
|= IRQ_NOREQUEST
;
1091 /* We need to create the radix trees late */
1092 static int irq_late_init(void)
1098 * No mutual exclusion with respect to accessors of the tree is needed
1099 * here as the synchronization is done via the state variable
1100 * revmap_trees_allocated.
1102 list_for_each_entry(h
, &irq_hosts
, link
) {
1103 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
1104 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_KERNEL
);
1108 * Make sure the radix trees inits are visible before setting
1112 revmap_trees_allocated
= 1;
1115 * Insert the reverse mapping for those interrupts already present
1118 mutex_lock(&revmap_trees_mutex
);
1119 for (i
= 0; i
< irq_virq_count
; i
++) {
1120 if (irq_map
[i
].host
&&
1121 (irq_map
[i
].host
->revmap_type
== IRQ_HOST_MAP_TREE
))
1122 radix_tree_insert(&irq_map
[i
].host
->revmap_data
.tree
,
1123 irq_map
[i
].hwirq
, &irq_map
[i
]);
1125 mutex_unlock(&revmap_trees_mutex
);
1128 * Make sure the radix trees insertions are visible before setting
1132 revmap_trees_allocated
= 2;
1136 arch_initcall(irq_late_init
);
1138 #ifdef CONFIG_VIRQ_DEBUG
1139 static int virq_debug_show(struct seq_file
*m
, void *private)
1141 unsigned long flags
;
1142 struct irq_desc
*desc
;
1144 char none
[] = "none";
1147 seq_printf(m
, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1148 "chip name", "host name");
1150 for (i
= 1; i
< nr_irqs
; i
++) {
1151 desc
= irq_to_desc(i
);
1155 raw_spin_lock_irqsave(&desc
->lock
, flags
);
1157 if (desc
->action
&& desc
->action
->handler
) {
1158 seq_printf(m
, "%5d ", i
);
1159 seq_printf(m
, "0x%05lx ", virq_to_hw(i
));
1161 if (desc
->chip
&& desc
->chip
->name
)
1162 p
= desc
->chip
->name
;
1165 seq_printf(m
, "%-15s ", p
);
1167 if (irq_map
[i
].host
&& irq_map
[i
].host
->of_node
)
1168 p
= irq_map
[i
].host
->of_node
->full_name
;
1171 seq_printf(m
, "%s\n", p
);
1174 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
1180 static int virq_debug_open(struct inode
*inode
, struct file
*file
)
1182 return single_open(file
, virq_debug_show
, inode
->i_private
);
1185 static const struct file_operations virq_debug_fops
= {
1186 .open
= virq_debug_open
,
1188 .llseek
= seq_lseek
,
1189 .release
= single_release
,
1192 static int __init
irq_debugfs_init(void)
1194 if (debugfs_create_file("virq_mapping", S_IRUGO
, powerpc_debugfs_root
,
1195 NULL
, &virq_debug_fops
) == NULL
)
1200 __initcall(irq_debugfs_init
);
1201 #endif /* CONFIG_VIRQ_DEBUG */
1204 static int __init
setup_noirqdistrib(char *str
)
1206 distribute_irqs
= 0;
1210 __setup("noirqdistrib", setup_noirqdistrib
);
1211 #endif /* CONFIG_PPC64 */