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>
74 #include <asm/firmware.h>
75 #include <asm/lv1call.h>
77 #define CREATE_TRACE_POINTS
78 #include <asm/trace.h>
80 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t
, irq_stat
);
81 EXPORT_PER_CPU_SYMBOL(irq_stat
);
83 int __irq_offset_value
;
86 EXPORT_SYMBOL(__irq_offset_value
);
87 atomic_t ppc_n_lost_interrupts
;
90 extern int tau_initialized
;
91 extern int tau_interrupts(int);
93 #endif /* CONFIG_PPC32 */
97 #ifndef CONFIG_SPARSE_IRQ
98 EXPORT_SYMBOL(irq_desc
);
101 int distribute_irqs
= 1;
103 static inline notrace
unsigned long get_hard_enabled(void)
105 unsigned long enabled
;
107 __asm__
__volatile__("lbz %0,%1(13)"
108 : "=r" (enabled
) : "i" (offsetof(struct paca_struct
, hard_enabled
)));
113 static inline notrace
void set_soft_enabled(unsigned long enable
)
115 __asm__
__volatile__("stb %0,%1(13)"
116 : : "r" (enable
), "i" (offsetof(struct paca_struct
, soft_enabled
)));
119 notrace
void arch_local_irq_restore(unsigned long en
)
122 * get_paca()->soft_enabled = en;
123 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
124 * That was allowed before, and in such a case we do need to take care
125 * that gcc will set soft_enabled directly via r13, not choose to use
126 * an intermediate register, lest we're preempted to a different cpu.
128 set_soft_enabled(en
);
132 #ifdef CONFIG_PPC_STD_MMU_64
133 if (firmware_has_feature(FW_FEATURE_ISERIES
)) {
135 * Do we need to disable preemption here? Not really: in the
136 * unlikely event that we're preempted to a different cpu in
137 * between getting r13, loading its lppaca_ptr, and loading
138 * its any_int, we might call iseries_handle_interrupts without
139 * an interrupt pending on the new cpu, but that's no disaster,
140 * is it? And the business of preempting us off the old cpu
141 * would itself involve a local_irq_restore which handles the
142 * interrupt to that cpu.
144 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
145 * to avoid any preemption checking added into get_paca().
147 if (local_paca
->lppaca_ptr
->int_dword
.any_int
)
148 iseries_handle_interrupts();
150 #endif /* CONFIG_PPC_STD_MMU_64 */
153 * if (get_paca()->hard_enabled) return;
154 * But again we need to take care that gcc gets hard_enabled directly
155 * via r13, not choose to use an intermediate register, lest we're
156 * preempted to a different cpu in between the two instructions.
158 if (get_hard_enabled())
161 #if defined(CONFIG_BOOKE) && defined(CONFIG_SMP)
162 /* Check for pending doorbell interrupts and resend to ourself */
163 doorbell_check_self();
167 * Need to hard-enable interrupts here. Since currently disabled,
168 * no need to take further asm precautions against preemption; but
169 * use local_paca instead of get_paca() to avoid preemption checking.
171 local_paca
->hard_enabled
= en
;
174 /* On server, re-trigger the decrementer if it went negative since
175 * some processors only trigger on edge transitions of the sign bit.
177 * BookE has a level sensitive decrementer (latches in TSR) so we
180 if ((int)mfspr(SPRN_DEC
) < 0)
182 #endif /* CONFIG_BOOKE */
185 * Force the delivery of pending soft-disabled interrupts on PS3.
186 * Any HV call will have this side effect.
188 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
190 lv1_get_version_info(&tmp
);
195 EXPORT_SYMBOL(arch_local_irq_restore
);
196 #endif /* CONFIG_PPC64 */
198 static int show_other_interrupts(struct seq_file
*p
, int prec
)
202 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
203 if (tau_initialized
) {
204 seq_printf(p
, "%*s: ", prec
, "TAU");
205 for_each_online_cpu(j
)
206 seq_printf(p
, "%10u ", tau_interrupts(j
));
207 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
209 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
211 seq_printf(p
, "%*s: ", prec
, "LOC");
212 for_each_online_cpu(j
)
213 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).timer_irqs
);
214 seq_printf(p
, " Local timer interrupts\n");
216 seq_printf(p
, "%*s: ", prec
, "SPU");
217 for_each_online_cpu(j
)
218 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).spurious_irqs
);
219 seq_printf(p
, " Spurious interrupts\n");
221 seq_printf(p
, "%*s: ", prec
, "CNT");
222 for_each_online_cpu(j
)
223 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).pmu_irqs
);
224 seq_printf(p
, " Performance monitoring interrupts\n");
226 seq_printf(p
, "%*s: ", prec
, "MCE");
227 for_each_online_cpu(j
)
228 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).mce_exceptions
);
229 seq_printf(p
, " Machine check exceptions\n");
234 int show_interrupts(struct seq_file
*p
, void *v
)
236 unsigned long flags
, any_count
= 0;
237 int i
= *(loff_t
*) v
, j
, prec
;
238 struct irqaction
*action
;
239 struct irq_desc
*desc
;
244 for (prec
= 3, j
= 1000; prec
< 10 && j
<= nr_irqs
; ++prec
)
248 return show_other_interrupts(p
, prec
);
252 seq_printf(p
, "%*s", prec
+ 8, "");
253 for_each_online_cpu(j
)
254 seq_printf(p
, "CPU%-8d", j
);
258 desc
= irq_to_desc(i
);
262 raw_spin_lock_irqsave(&desc
->lock
, flags
);
263 for_each_online_cpu(j
)
264 any_count
|= kstat_irqs_cpu(i
, j
);
265 action
= desc
->action
;
266 if (!action
&& !any_count
)
269 seq_printf(p
, "%*d: ", prec
, i
);
270 for_each_online_cpu(j
)
271 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
274 seq_printf(p
, " %-16s", desc
->chip
->name
);
276 seq_printf(p
, " %-16s", "None");
277 seq_printf(p
, " %-8s", (desc
->status
& IRQ_LEVEL
) ? "Level" : "Edge");
280 seq_printf(p
, " %s", action
->name
);
281 while ((action
= action
->next
) != NULL
)
282 seq_printf(p
, ", %s", action
->name
);
287 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
294 u64
arch_irq_stat_cpu(unsigned int cpu
)
296 u64 sum
= per_cpu(irq_stat
, cpu
).timer_irqs
;
298 sum
+= per_cpu(irq_stat
, cpu
).pmu_irqs
;
299 sum
+= per_cpu(irq_stat
, cpu
).mce_exceptions
;
300 sum
+= per_cpu(irq_stat
, cpu
).spurious_irqs
;
305 #ifdef CONFIG_HOTPLUG_CPU
306 void fixup_irqs(const struct cpumask
*map
)
308 struct irq_desc
*desc
;
313 alloc_cpumask_var(&mask
, GFP_KERNEL
);
316 desc
= irq_to_desc(irq
);
320 if (desc
->status
& IRQ_PER_CPU
)
323 cpumask_and(mask
, desc
->affinity
, map
);
324 if (cpumask_any(mask
) >= nr_cpu_ids
) {
325 printk("Breaking affinity for irq %i\n", irq
);
326 cpumask_copy(mask
, map
);
328 if (desc
->chip
->set_affinity
)
329 desc
->chip
->set_affinity(irq
, mask
);
330 else if (desc
->action
&& !(warned
++))
331 printk("Cannot set affinity for irq %i\n", irq
);
334 free_cpumask_var(mask
);
342 static inline void handle_one_irq(unsigned int irq
)
344 struct thread_info
*curtp
, *irqtp
;
345 unsigned long saved_sp_limit
;
346 struct irq_desc
*desc
;
348 /* Switch to the irq stack to handle this */
349 curtp
= current_thread_info();
350 irqtp
= hardirq_ctx
[smp_processor_id()];
352 if (curtp
== irqtp
) {
353 /* We're already on the irq stack, just handle it */
354 generic_handle_irq(irq
);
358 desc
= irq_to_desc(irq
);
359 saved_sp_limit
= current
->thread
.ksp_limit
;
361 irqtp
->task
= curtp
->task
;
364 /* Copy the softirq bits in preempt_count so that the
365 * softirq checks work in the hardirq context. */
366 irqtp
->preempt_count
= (irqtp
->preempt_count
& ~SOFTIRQ_MASK
) |
367 (curtp
->preempt_count
& SOFTIRQ_MASK
);
369 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
370 _ALIGN_UP(sizeof(struct thread_info
), 16);
372 call_handle_irq(irq
, desc
, irqtp
, desc
->handle_irq
);
373 current
->thread
.ksp_limit
= saved_sp_limit
;
376 /* Set any flag that may have been set on the
380 set_bits(irqtp
->flags
, &curtp
->flags
);
383 static inline void check_stack_overflow(void)
385 #ifdef CONFIG_DEBUG_STACKOVERFLOW
388 sp
= __get_SP() & (THREAD_SIZE
-1);
390 /* check for stack overflow: is there less than 2KB free? */
391 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
392 printk("do_IRQ: stack overflow: %ld\n",
393 sp
- sizeof(struct thread_info
));
399 void do_IRQ(struct pt_regs
*regs
)
401 struct pt_regs
*old_regs
= set_irq_regs(regs
);
404 trace_irq_entry(regs
);
408 check_stack_overflow();
410 irq
= ppc_md
.get_irq();
412 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
)
414 else if (irq
!= NO_IRQ_IGNORE
)
415 __get_cpu_var(irq_stat
).spurious_irqs
++;
418 set_irq_regs(old_regs
);
420 #ifdef CONFIG_PPC_ISERIES
421 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
422 get_lppaca()->int_dword
.fields
.decr_int
) {
423 get_lppaca()->int_dword
.fields
.decr_int
= 0;
424 /* Signal a fake decrementer interrupt */
425 timer_interrupt(regs
);
429 trace_irq_exit(regs
);
432 void __init
init_IRQ(void)
442 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
443 struct thread_info
*critirq_ctx
[NR_CPUS
] __read_mostly
;
444 struct thread_info
*dbgirq_ctx
[NR_CPUS
] __read_mostly
;
445 struct thread_info
*mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
447 void exc_lvl_ctx_init(void)
449 struct thread_info
*tp
;
452 for_each_possible_cpu(i
) {
453 hw_cpu
= get_hard_smp_processor_id(i
);
454 memset((void *)critirq_ctx
[hw_cpu
], 0, THREAD_SIZE
);
455 tp
= critirq_ctx
[hw_cpu
];
457 tp
->preempt_count
= 0;
460 memset((void *)dbgirq_ctx
[hw_cpu
], 0, THREAD_SIZE
);
461 tp
= dbgirq_ctx
[hw_cpu
];
463 tp
->preempt_count
= 0;
465 memset((void *)mcheckirq_ctx
[hw_cpu
], 0, THREAD_SIZE
);
466 tp
= mcheckirq_ctx
[hw_cpu
];
468 tp
->preempt_count
= HARDIRQ_OFFSET
;
474 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
475 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
477 void irq_ctx_init(void)
479 struct thread_info
*tp
;
482 for_each_possible_cpu(i
) {
483 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
486 tp
->preempt_count
= 0;
488 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
491 tp
->preempt_count
= HARDIRQ_OFFSET
;
495 static inline void do_softirq_onstack(void)
497 struct thread_info
*curtp
, *irqtp
;
498 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
500 curtp
= current_thread_info();
501 irqtp
= softirq_ctx
[smp_processor_id()];
502 irqtp
->task
= curtp
->task
;
503 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
504 _ALIGN_UP(sizeof(struct thread_info
), 16);
505 call_do_softirq(irqtp
);
506 current
->thread
.ksp_limit
= saved_sp_limit
;
510 void do_softirq(void)
517 local_irq_save(flags
);
519 if (local_softirq_pending())
520 do_softirq_onstack();
522 local_irq_restore(flags
);
527 * IRQ controller and virtual interrupts
530 static LIST_HEAD(irq_hosts
);
531 static DEFINE_RAW_SPINLOCK(irq_big_lock
);
532 static unsigned int revmap_trees_allocated
;
533 static DEFINE_MUTEX(revmap_trees_mutex
);
534 struct irq_map_entry irq_map
[NR_IRQS
];
535 static unsigned int irq_virq_count
= NR_IRQS
;
536 static struct irq_host
*irq_default_host
;
538 irq_hw_number_t
virq_to_hw(unsigned int virq
)
540 return irq_map
[virq
].hwirq
;
542 EXPORT_SYMBOL_GPL(virq_to_hw
);
544 static int default_irq_host_match(struct irq_host
*h
, struct device_node
*np
)
546 return h
->of_node
!= NULL
&& h
->of_node
== np
;
549 struct irq_host
*irq_alloc_host(struct device_node
*of_node
,
550 unsigned int revmap_type
,
551 unsigned int revmap_arg
,
552 struct irq_host_ops
*ops
,
553 irq_hw_number_t inval_irq
)
555 struct irq_host
*host
;
556 unsigned int size
= sizeof(struct irq_host
);
561 /* Allocate structure and revmap table if using linear mapping */
562 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
563 size
+= revmap_arg
* sizeof(unsigned int);
564 host
= zalloc_maybe_bootmem(size
, GFP_KERNEL
);
569 host
->revmap_type
= revmap_type
;
570 host
->inval_irq
= inval_irq
;
572 host
->of_node
= of_node_get(of_node
);
574 if (host
->ops
->match
== NULL
)
575 host
->ops
->match
= default_irq_host_match
;
577 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
579 /* If it's a legacy controller, check for duplicates and
580 * mark it as allocated (we use irq 0 host pointer for that
582 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
583 if (irq_map
[0].host
!= NULL
) {
584 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
585 /* If we are early boot, we can't free the structure,
587 * this will be fixed once slab is made available early
588 * instead of the current cruft
591 of_node_put(host
->of_node
);
596 irq_map
[0].host
= host
;
599 list_add(&host
->link
, &irq_hosts
);
600 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
602 /* Additional setups per revmap type */
603 switch(revmap_type
) {
604 case IRQ_HOST_MAP_LEGACY
:
605 /* 0 is always the invalid number for legacy */
607 /* setup us as the host for all legacy interrupts */
608 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
609 irq_map
[i
].hwirq
= i
;
611 irq_map
[i
].host
= host
;
614 /* Clear norequest flags */
615 irq_to_desc(i
)->status
&= ~IRQ_NOREQUEST
;
617 /* Legacy flags are left to default at this point,
618 * one can then use irq_create_mapping() to
619 * explicitly change them
621 ops
->map(host
, i
, i
);
624 case IRQ_HOST_MAP_LINEAR
:
625 rmap
= (unsigned int *)(host
+ 1);
626 for (i
= 0; i
< revmap_arg
; i
++)
628 host
->revmap_data
.linear
.size
= revmap_arg
;
630 host
->revmap_data
.linear
.revmap
= rmap
;
636 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
641 struct irq_host
*irq_find_host(struct device_node
*node
)
643 struct irq_host
*h
, *found
= NULL
;
646 /* We might want to match the legacy controller last since
647 * it might potentially be set to match all interrupts in
648 * the absence of a device node. This isn't a problem so far
651 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
652 list_for_each_entry(h
, &irq_hosts
, link
)
653 if (h
->ops
->match(h
, node
)) {
657 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
660 EXPORT_SYMBOL_GPL(irq_find_host
);
662 void irq_set_default_host(struct irq_host
*host
)
664 pr_debug("irq: Default host set to @0x%p\n", host
);
666 irq_default_host
= host
;
669 void irq_set_virq_count(unsigned int count
)
671 pr_debug("irq: Trying to set virq count to %d\n", count
);
673 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
675 irq_virq_count
= count
;
678 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
679 irq_hw_number_t hwirq
)
681 struct irq_desc
*desc
;
683 desc
= irq_to_desc_alloc_node(virq
, 0);
685 pr_debug("irq: -> allocating desc failed\n");
689 /* Clear IRQ_NOREQUEST flag */
690 desc
->status
&= ~IRQ_NOREQUEST
;
694 irq_map
[virq
].hwirq
= hwirq
;
697 if (host
->ops
->map(host
, virq
, hwirq
)) {
698 pr_debug("irq: -> mapping failed, freeing\n");
705 irq_free_virt(virq
, 1);
709 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
714 host
= irq_default_host
;
716 BUG_ON(host
== NULL
);
717 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
719 virq
= irq_alloc_virt(host
, 1, 0);
720 if (virq
== NO_IRQ
) {
721 pr_debug("irq: create_direct virq allocation failed\n");
725 pr_debug("irq: create_direct obtained virq %d\n", virq
);
727 if (irq_setup_virq(host
, virq
, virq
))
733 unsigned int irq_create_mapping(struct irq_host
*host
,
734 irq_hw_number_t hwirq
)
736 unsigned int virq
, hint
;
738 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
740 /* Look for default host if nececssary */
742 host
= irq_default_host
;
744 printk(KERN_WARNING
"irq_create_mapping called for"
745 " NULL host, hwirq=%lx\n", hwirq
);
749 pr_debug("irq: -> using host @%p\n", host
);
751 /* Check if mapping already exist, if it does, call
752 * host->ops->map() to update the flags
754 virq
= irq_find_mapping(host
, hwirq
);
755 if (virq
!= NO_IRQ
) {
756 if (host
->ops
->remap
)
757 host
->ops
->remap(host
, virq
, hwirq
);
758 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
762 /* Get a virtual interrupt number */
763 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
765 virq
= (unsigned int)hwirq
;
766 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
770 /* Allocate a virtual interrupt number */
771 hint
= hwirq
% irq_virq_count
;
772 virq
= irq_alloc_virt(host
, 1, hint
);
773 if (virq
== NO_IRQ
) {
774 pr_debug("irq: -> virq allocation failed\n");
779 if (irq_setup_virq(host
, virq
, hwirq
))
782 printk(KERN_DEBUG
"irq: irq %lu on host %s mapped to virtual irq %u\n",
783 hwirq
, host
->of_node
? host
->of_node
->full_name
: "null", virq
);
787 EXPORT_SYMBOL_GPL(irq_create_mapping
);
789 unsigned int irq_create_of_mapping(struct device_node
*controller
,
790 const u32
*intspec
, unsigned int intsize
)
792 struct irq_host
*host
;
793 irq_hw_number_t hwirq
;
794 unsigned int type
= IRQ_TYPE_NONE
;
797 if (controller
== NULL
)
798 host
= irq_default_host
;
800 host
= irq_find_host(controller
);
802 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
803 controller
->full_name
);
807 /* If host has no translation, then we assume interrupt line */
808 if (host
->ops
->xlate
== NULL
)
811 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
817 virq
= irq_create_mapping(host
, hwirq
);
821 /* Set type if specified and different than the current one */
822 if (type
!= IRQ_TYPE_NONE
&&
823 type
!= (irq_to_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
824 set_irq_type(virq
, type
);
827 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
829 void irq_dispose_mapping(unsigned int virq
)
831 struct irq_host
*host
;
832 irq_hw_number_t hwirq
;
837 host
= irq_map
[virq
].host
;
838 WARN_ON (host
== NULL
);
842 /* Never unmap legacy interrupts */
843 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
846 /* remove chip and handler */
847 set_irq_chip_and_handler(virq
, NULL
, NULL
);
849 /* Make sure it's completed */
850 synchronize_irq(virq
);
852 /* Tell the PIC about it */
853 if (host
->ops
->unmap
)
854 host
->ops
->unmap(host
, virq
);
857 /* Clear reverse map */
858 hwirq
= irq_map
[virq
].hwirq
;
859 switch(host
->revmap_type
) {
860 case IRQ_HOST_MAP_LINEAR
:
861 if (hwirq
< host
->revmap_data
.linear
.size
)
862 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
864 case IRQ_HOST_MAP_TREE
:
866 * Check if radix tree allocated yet, if not then nothing to
870 if (revmap_trees_allocated
< 1)
872 mutex_lock(&revmap_trees_mutex
);
873 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
874 mutex_unlock(&revmap_trees_mutex
);
880 irq_map
[virq
].hwirq
= host
->inval_irq
;
883 irq_to_desc(virq
)->status
|= IRQ_NOREQUEST
;
886 irq_free_virt(virq
, 1);
888 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
890 unsigned int irq_find_mapping(struct irq_host
*host
,
891 irq_hw_number_t hwirq
)
894 unsigned int hint
= hwirq
% irq_virq_count
;
896 /* Look for default host if nececssary */
898 host
= irq_default_host
;
902 /* legacy -> bail early */
903 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
906 /* Slow path does a linear search of the map */
907 if (hint
< NUM_ISA_INTERRUPTS
)
908 hint
= NUM_ISA_INTERRUPTS
;
911 if (irq_map
[i
].host
== host
&&
912 irq_map
[i
].hwirq
== hwirq
)
915 if (i
>= irq_virq_count
)
916 i
= NUM_ISA_INTERRUPTS
;
920 EXPORT_SYMBOL_GPL(irq_find_mapping
);
923 unsigned int irq_radix_revmap_lookup(struct irq_host
*host
,
924 irq_hw_number_t hwirq
)
926 struct irq_map_entry
*ptr
;
929 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
932 * Check if the radix tree exists and has bee initialized.
933 * If not, we fallback to slow mode
935 if (revmap_trees_allocated
< 2)
936 return irq_find_mapping(host
, hwirq
);
938 /* Now try to resolve */
940 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
941 * as it's referencing an entry in the static irq_map table.
943 ptr
= radix_tree_lookup(&host
->revmap_data
.tree
, hwirq
);
946 * If found in radix tree, then fine.
947 * Else fallback to linear lookup - this should not happen in practice
948 * as it means that we failed to insert the node in the radix tree.
951 virq
= ptr
- irq_map
;
953 virq
= irq_find_mapping(host
, hwirq
);
958 void irq_radix_revmap_insert(struct irq_host
*host
, unsigned int virq
,
959 irq_hw_number_t hwirq
)
962 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
965 * Check if the radix tree exists yet.
966 * If not, then the irq will be inserted into the tree when it gets
970 if (revmap_trees_allocated
< 1)
973 if (virq
!= NO_IRQ
) {
974 mutex_lock(&revmap_trees_mutex
);
975 radix_tree_insert(&host
->revmap_data
.tree
, hwirq
,
977 mutex_unlock(&revmap_trees_mutex
);
981 unsigned int irq_linear_revmap(struct irq_host
*host
,
982 irq_hw_number_t hwirq
)
984 unsigned int *revmap
;
986 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
988 /* Check revmap bounds */
989 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
990 return irq_find_mapping(host
, hwirq
);
992 /* Check if revmap was allocated */
993 revmap
= host
->revmap_data
.linear
.revmap
;
994 if (unlikely(revmap
== NULL
))
995 return irq_find_mapping(host
, hwirq
);
997 /* Fill up revmap with slow path if no mapping found */
998 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
999 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
1001 return revmap
[hwirq
];
1004 unsigned int irq_alloc_virt(struct irq_host
*host
,
1008 unsigned long flags
;
1009 unsigned int i
, j
, found
= NO_IRQ
;
1011 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
1014 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
1016 /* Use hint for 1 interrupt if any */
1017 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
1018 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
1023 /* Look for count consecutive numbers in the allocatable
1024 * (non-legacy) space
1026 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
1027 if (irq_map
[i
].host
!= NULL
)
1033 found
= i
- count
+ 1;
1037 if (found
== NO_IRQ
) {
1038 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
1042 for (i
= found
; i
< (found
+ count
); i
++) {
1043 irq_map
[i
].hwirq
= host
->inval_irq
;
1045 irq_map
[i
].host
= host
;
1047 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
1051 void irq_free_virt(unsigned int virq
, unsigned int count
)
1053 unsigned long flags
;
1056 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
1057 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
1059 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
1060 for (i
= virq
; i
< (virq
+ count
); i
++) {
1061 struct irq_host
*host
;
1063 if (i
< NUM_ISA_INTERRUPTS
||
1064 (virq
+ count
) > irq_virq_count
)
1067 host
= irq_map
[i
].host
;
1068 irq_map
[i
].hwirq
= host
->inval_irq
;
1070 irq_map
[i
].host
= NULL
;
1072 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
1075 int arch_early_irq_init(void)
1077 struct irq_desc
*desc
;
1080 for (i
= 0; i
< NR_IRQS
; i
++) {
1081 desc
= irq_to_desc(i
);
1083 desc
->status
|= IRQ_NOREQUEST
;
1089 int arch_init_chip_data(struct irq_desc
*desc
, int node
)
1091 desc
->status
|= IRQ_NOREQUEST
;
1095 /* We need to create the radix trees late */
1096 static int irq_late_init(void)
1102 * No mutual exclusion with respect to accessors of the tree is needed
1103 * here as the synchronization is done via the state variable
1104 * revmap_trees_allocated.
1106 list_for_each_entry(h
, &irq_hosts
, link
) {
1107 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
1108 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_KERNEL
);
1112 * Make sure the radix trees inits are visible before setting
1116 revmap_trees_allocated
= 1;
1119 * Insert the reverse mapping for those interrupts already present
1122 mutex_lock(&revmap_trees_mutex
);
1123 for (i
= 0; i
< irq_virq_count
; i
++) {
1124 if (irq_map
[i
].host
&&
1125 (irq_map
[i
].host
->revmap_type
== IRQ_HOST_MAP_TREE
))
1126 radix_tree_insert(&irq_map
[i
].host
->revmap_data
.tree
,
1127 irq_map
[i
].hwirq
, &irq_map
[i
]);
1129 mutex_unlock(&revmap_trees_mutex
);
1132 * Make sure the radix trees insertions are visible before setting
1136 revmap_trees_allocated
= 2;
1140 arch_initcall(irq_late_init
);
1142 #ifdef CONFIG_VIRQ_DEBUG
1143 static int virq_debug_show(struct seq_file
*m
, void *private)
1145 unsigned long flags
;
1146 struct irq_desc
*desc
;
1148 static const char none
[] = "none";
1151 seq_printf(m
, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1152 "chip name", "host name");
1154 for (i
= 1; i
< nr_irqs
; i
++) {
1155 desc
= irq_to_desc(i
);
1159 raw_spin_lock_irqsave(&desc
->lock
, flags
);
1161 if (desc
->action
&& desc
->action
->handler
) {
1162 seq_printf(m
, "%5d ", i
);
1163 seq_printf(m
, "0x%05lx ", virq_to_hw(i
));
1165 if (desc
->chip
&& desc
->chip
->name
)
1166 p
= desc
->chip
->name
;
1169 seq_printf(m
, "%-15s ", p
);
1171 if (irq_map
[i
].host
&& irq_map
[i
].host
->of_node
)
1172 p
= irq_map
[i
].host
->of_node
->full_name
;
1175 seq_printf(m
, "%s\n", p
);
1178 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
1184 static int virq_debug_open(struct inode
*inode
, struct file
*file
)
1186 return single_open(file
, virq_debug_show
, inode
->i_private
);
1189 static const struct file_operations virq_debug_fops
= {
1190 .open
= virq_debug_open
,
1192 .llseek
= seq_lseek
,
1193 .release
= single_release
,
1196 static int __init
irq_debugfs_init(void)
1198 if (debugfs_create_file("virq_mapping", S_IRUGO
, powerpc_debugfs_root
,
1199 NULL
, &virq_debug_fops
) == NULL
)
1204 __initcall(irq_debugfs_init
);
1205 #endif /* CONFIG_VIRQ_DEBUG */
1208 static int __init
setup_noirqdistrib(char *str
)
1210 distribute_irqs
= 0;
1214 __setup("noirqdistrib", setup_noirqdistrib
);
1215 #endif /* CONFIG_PPC64 */