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
;
174 struct irq_desc
*desc
;
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_irqs_cpu(i
, j
));
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 cpumask_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 #ifdef CONFIG_IRQSTACKS
252 static inline void handle_one_irq(unsigned int irq
)
254 struct thread_info
*curtp
, *irqtp
;
255 unsigned long saved_sp_limit
;
256 struct irq_desc
*desc
;
258 /* Switch to the irq stack to handle this */
259 curtp
= current_thread_info();
260 irqtp
= hardirq_ctx
[smp_processor_id()];
262 if (curtp
== irqtp
) {
263 /* We're already on the irq stack, just handle it */
264 generic_handle_irq(irq
);
268 desc
= irq_desc
+ irq
;
269 saved_sp_limit
= current
->thread
.ksp_limit
;
271 irqtp
->task
= curtp
->task
;
274 /* Copy the softirq bits in preempt_count so that the
275 * softirq checks work in the hardirq context. */
276 irqtp
->preempt_count
= (irqtp
->preempt_count
& ~SOFTIRQ_MASK
) |
277 (curtp
->preempt_count
& SOFTIRQ_MASK
);
279 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
280 _ALIGN_UP(sizeof(struct thread_info
), 16);
282 call_handle_irq(irq
, desc
, irqtp
, desc
->handle_irq
);
283 current
->thread
.ksp_limit
= saved_sp_limit
;
286 /* Set any flag that may have been set on the
290 set_bits(irqtp
->flags
, &curtp
->flags
);
293 static inline void handle_one_irq(unsigned int irq
)
295 generic_handle_irq(irq
);
299 static inline void check_stack_overflow(void)
301 #ifdef CONFIG_DEBUG_STACKOVERFLOW
304 sp
= __get_SP() & (THREAD_SIZE
-1);
306 /* check for stack overflow: is there less than 2KB free? */
307 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
308 printk("do_IRQ: stack overflow: %ld\n",
309 sp
- sizeof(struct thread_info
));
315 void do_IRQ(struct pt_regs
*regs
)
317 struct pt_regs
*old_regs
= set_irq_regs(regs
);
322 check_stack_overflow();
324 irq
= ppc_md
.get_irq();
326 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
)
328 else if (irq
!= NO_IRQ_IGNORE
)
329 /* That's not SMP safe ... but who cares ? */
330 ppc_spurious_interrupts
++;
333 set_irq_regs(old_regs
);
335 #ifdef CONFIG_PPC_ISERIES
336 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
337 get_lppaca()->int_dword
.fields
.decr_int
) {
338 get_lppaca()->int_dword
.fields
.decr_int
= 0;
339 /* Signal a fake decrementer interrupt */
340 timer_interrupt(regs
);
345 void __init
init_IRQ(void)
355 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
356 struct thread_info
*critirq_ctx
[NR_CPUS
] __read_mostly
;
357 struct thread_info
*dbgirq_ctx
[NR_CPUS
] __read_mostly
;
358 struct thread_info
*mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
360 void exc_lvl_ctx_init(void)
362 struct thread_info
*tp
;
365 for_each_possible_cpu(i
) {
366 memset((void *)critirq_ctx
[i
], 0, THREAD_SIZE
);
369 tp
->preempt_count
= 0;
372 memset((void *)dbgirq_ctx
[i
], 0, THREAD_SIZE
);
375 tp
->preempt_count
= 0;
377 memset((void *)mcheckirq_ctx
[i
], 0, THREAD_SIZE
);
378 tp
= mcheckirq_ctx
[i
];
380 tp
->preempt_count
= HARDIRQ_OFFSET
;
386 #ifdef CONFIG_IRQSTACKS
387 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
388 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
390 void irq_ctx_init(void)
392 struct thread_info
*tp
;
395 for_each_possible_cpu(i
) {
396 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
399 tp
->preempt_count
= 0;
401 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
404 tp
->preempt_count
= HARDIRQ_OFFSET
;
408 static inline void do_softirq_onstack(void)
410 struct thread_info
*curtp
, *irqtp
;
411 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
413 curtp
= current_thread_info();
414 irqtp
= softirq_ctx
[smp_processor_id()];
415 irqtp
->task
= curtp
->task
;
416 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
417 _ALIGN_UP(sizeof(struct thread_info
), 16);
418 call_do_softirq(irqtp
);
419 current
->thread
.ksp_limit
= saved_sp_limit
;
424 #define do_softirq_onstack() __do_softirq()
425 #endif /* CONFIG_IRQSTACKS */
427 void do_softirq(void)
434 local_irq_save(flags
);
436 if (local_softirq_pending())
437 do_softirq_onstack();
439 local_irq_restore(flags
);
444 * IRQ controller and virtual interrupts
447 static LIST_HEAD(irq_hosts
);
448 static DEFINE_SPINLOCK(irq_big_lock
);
449 static unsigned int revmap_trees_allocated
;
450 static DEFINE_MUTEX(revmap_trees_mutex
);
451 struct irq_map_entry irq_map
[NR_IRQS
];
452 static unsigned int irq_virq_count
= NR_IRQS
;
453 static struct irq_host
*irq_default_host
;
455 irq_hw_number_t
virq_to_hw(unsigned int virq
)
457 return irq_map
[virq
].hwirq
;
459 EXPORT_SYMBOL_GPL(virq_to_hw
);
461 static int default_irq_host_match(struct irq_host
*h
, struct device_node
*np
)
463 return h
->of_node
!= NULL
&& h
->of_node
== np
;
466 struct irq_host
*irq_alloc_host(struct device_node
*of_node
,
467 unsigned int revmap_type
,
468 unsigned int revmap_arg
,
469 struct irq_host_ops
*ops
,
470 irq_hw_number_t inval_irq
)
472 struct irq_host
*host
;
473 unsigned int size
= sizeof(struct irq_host
);
478 /* Allocate structure and revmap table if using linear mapping */
479 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
480 size
+= revmap_arg
* sizeof(unsigned int);
481 host
= zalloc_maybe_bootmem(size
, GFP_KERNEL
);
486 host
->revmap_type
= revmap_type
;
487 host
->inval_irq
= inval_irq
;
489 host
->of_node
= of_node_get(of_node
);
491 if (host
->ops
->match
== NULL
)
492 host
->ops
->match
= default_irq_host_match
;
494 spin_lock_irqsave(&irq_big_lock
, flags
);
496 /* If it's a legacy controller, check for duplicates and
497 * mark it as allocated (we use irq 0 host pointer for that
499 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
500 if (irq_map
[0].host
!= NULL
) {
501 spin_unlock_irqrestore(&irq_big_lock
, flags
);
502 /* If we are early boot, we can't free the structure,
504 * this will be fixed once slab is made available early
505 * instead of the current cruft
511 irq_map
[0].host
= host
;
514 list_add(&host
->link
, &irq_hosts
);
515 spin_unlock_irqrestore(&irq_big_lock
, flags
);
517 /* Additional setups per revmap type */
518 switch(revmap_type
) {
519 case IRQ_HOST_MAP_LEGACY
:
520 /* 0 is always the invalid number for legacy */
522 /* setup us as the host for all legacy interrupts */
523 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
524 irq_map
[i
].hwirq
= i
;
526 irq_map
[i
].host
= host
;
529 /* Clear norequest flags */
530 get_irq_desc(i
)->status
&= ~IRQ_NOREQUEST
;
532 /* Legacy flags are left to default at this point,
533 * one can then use irq_create_mapping() to
534 * explicitly change them
536 ops
->map(host
, i
, i
);
539 case IRQ_HOST_MAP_LINEAR
:
540 rmap
= (unsigned int *)(host
+ 1);
541 for (i
= 0; i
< revmap_arg
; i
++)
543 host
->revmap_data
.linear
.size
= revmap_arg
;
545 host
->revmap_data
.linear
.revmap
= rmap
;
551 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
556 struct irq_host
*irq_find_host(struct device_node
*node
)
558 struct irq_host
*h
, *found
= NULL
;
561 /* We might want to match the legacy controller last since
562 * it might potentially be set to match all interrupts in
563 * the absence of a device node. This isn't a problem so far
566 spin_lock_irqsave(&irq_big_lock
, flags
);
567 list_for_each_entry(h
, &irq_hosts
, link
)
568 if (h
->ops
->match(h
, node
)) {
572 spin_unlock_irqrestore(&irq_big_lock
, flags
);
575 EXPORT_SYMBOL_GPL(irq_find_host
);
577 void irq_set_default_host(struct irq_host
*host
)
579 pr_debug("irq: Default host set to @0x%p\n", host
);
581 irq_default_host
= host
;
584 void irq_set_virq_count(unsigned int count
)
586 pr_debug("irq: Trying to set virq count to %d\n", count
);
588 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
590 irq_virq_count
= count
;
593 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
594 irq_hw_number_t hwirq
)
596 /* Clear IRQ_NOREQUEST flag */
597 get_irq_desc(virq
)->status
&= ~IRQ_NOREQUEST
;
601 irq_map
[virq
].hwirq
= hwirq
;
604 if (host
->ops
->map(host
, virq
, hwirq
)) {
605 pr_debug("irq: -> mapping failed, freeing\n");
606 irq_free_virt(virq
, 1);
613 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
618 host
= irq_default_host
;
620 BUG_ON(host
== NULL
);
621 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
623 virq
= irq_alloc_virt(host
, 1, 0);
624 if (virq
== NO_IRQ
) {
625 pr_debug("irq: create_direct virq allocation failed\n");
629 pr_debug("irq: create_direct obtained virq %d\n", virq
);
631 if (irq_setup_virq(host
, virq
, virq
))
637 unsigned int irq_create_mapping(struct irq_host
*host
,
638 irq_hw_number_t hwirq
)
640 unsigned int virq
, hint
;
642 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
644 /* Look for default host if nececssary */
646 host
= irq_default_host
;
648 printk(KERN_WARNING
"irq_create_mapping called for"
649 " NULL host, hwirq=%lx\n", hwirq
);
653 pr_debug("irq: -> using host @%p\n", host
);
655 /* Check if mapping already exist, if it does, call
656 * host->ops->map() to update the flags
658 virq
= irq_find_mapping(host
, hwirq
);
659 if (virq
!= NO_IRQ
) {
660 if (host
->ops
->remap
)
661 host
->ops
->remap(host
, virq
, hwirq
);
662 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
666 /* Get a virtual interrupt number */
667 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
669 virq
= (unsigned int)hwirq
;
670 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
674 /* Allocate a virtual interrupt number */
675 hint
= hwirq
% irq_virq_count
;
676 virq
= irq_alloc_virt(host
, 1, hint
);
677 if (virq
== NO_IRQ
) {
678 pr_debug("irq: -> virq allocation failed\n");
683 if (irq_setup_virq(host
, virq
, hwirq
))
686 printk(KERN_DEBUG
"irq: irq %lu on host %s mapped to virtual irq %u\n",
687 hwirq
, host
->of_node
? host
->of_node
->full_name
: "null", virq
);
691 EXPORT_SYMBOL_GPL(irq_create_mapping
);
693 unsigned int irq_create_of_mapping(struct device_node
*controller
,
694 u32
*intspec
, unsigned int intsize
)
696 struct irq_host
*host
;
697 irq_hw_number_t hwirq
;
698 unsigned int type
= IRQ_TYPE_NONE
;
701 if (controller
== NULL
)
702 host
= irq_default_host
;
704 host
= irq_find_host(controller
);
706 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
707 controller
->full_name
);
711 /* If host has no translation, then we assume interrupt line */
712 if (host
->ops
->xlate
== NULL
)
715 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
721 virq
= irq_create_mapping(host
, hwirq
);
725 /* Set type if specified and different than the current one */
726 if (type
!= IRQ_TYPE_NONE
&&
727 type
!= (get_irq_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
728 set_irq_type(virq
, type
);
731 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
733 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
737 if (of_irq_map_one(dev
, index
, &oirq
))
740 return irq_create_of_mapping(oirq
.controller
, oirq
.specifier
,
743 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
745 void irq_dispose_mapping(unsigned int virq
)
747 struct irq_host
*host
;
748 irq_hw_number_t hwirq
;
753 host
= irq_map
[virq
].host
;
754 WARN_ON (host
== NULL
);
758 /* Never unmap legacy interrupts */
759 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
762 /* remove chip and handler */
763 set_irq_chip_and_handler(virq
, NULL
, NULL
);
765 /* Make sure it's completed */
766 synchronize_irq(virq
);
768 /* Tell the PIC about it */
769 if (host
->ops
->unmap
)
770 host
->ops
->unmap(host
, virq
);
773 /* Clear reverse map */
774 hwirq
= irq_map
[virq
].hwirq
;
775 switch(host
->revmap_type
) {
776 case IRQ_HOST_MAP_LINEAR
:
777 if (hwirq
< host
->revmap_data
.linear
.size
)
778 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
780 case IRQ_HOST_MAP_TREE
:
782 * Check if radix tree allocated yet, if not then nothing to
786 if (revmap_trees_allocated
< 1)
788 mutex_lock(&revmap_trees_mutex
);
789 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
790 mutex_unlock(&revmap_trees_mutex
);
796 irq_map
[virq
].hwirq
= host
->inval_irq
;
799 get_irq_desc(virq
)->status
|= IRQ_NOREQUEST
;
802 irq_free_virt(virq
, 1);
804 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
806 unsigned int irq_find_mapping(struct irq_host
*host
,
807 irq_hw_number_t hwirq
)
810 unsigned int hint
= hwirq
% irq_virq_count
;
812 /* Look for default host if nececssary */
814 host
= irq_default_host
;
818 /* legacy -> bail early */
819 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
822 /* Slow path does a linear search of the map */
823 if (hint
< NUM_ISA_INTERRUPTS
)
824 hint
= NUM_ISA_INTERRUPTS
;
827 if (irq_map
[i
].host
== host
&&
828 irq_map
[i
].hwirq
== hwirq
)
831 if (i
>= irq_virq_count
)
832 i
= NUM_ISA_INTERRUPTS
;
836 EXPORT_SYMBOL_GPL(irq_find_mapping
);
839 unsigned int irq_radix_revmap_lookup(struct irq_host
*host
,
840 irq_hw_number_t hwirq
)
842 struct irq_map_entry
*ptr
;
845 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
848 * Check if the radix tree exists and has bee initialized.
849 * If not, we fallback to slow mode
851 if (revmap_trees_allocated
< 2)
852 return irq_find_mapping(host
, hwirq
);
854 /* Now try to resolve */
856 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
857 * as it's referencing an entry in the static irq_map table.
859 ptr
= radix_tree_lookup(&host
->revmap_data
.tree
, hwirq
);
862 * If found in radix tree, then fine.
863 * Else fallback to linear lookup - this should not happen in practice
864 * as it means that we failed to insert the node in the radix tree.
867 virq
= ptr
- irq_map
;
869 virq
= irq_find_mapping(host
, hwirq
);
874 void irq_radix_revmap_insert(struct irq_host
*host
, unsigned int virq
,
875 irq_hw_number_t hwirq
)
878 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
881 * Check if the radix tree exists yet.
882 * If not, then the irq will be inserted into the tree when it gets
886 if (revmap_trees_allocated
< 1)
889 if (virq
!= NO_IRQ
) {
890 mutex_lock(&revmap_trees_mutex
);
891 radix_tree_insert(&host
->revmap_data
.tree
, hwirq
,
893 mutex_unlock(&revmap_trees_mutex
);
897 unsigned int irq_linear_revmap(struct irq_host
*host
,
898 irq_hw_number_t hwirq
)
900 unsigned int *revmap
;
902 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
904 /* Check revmap bounds */
905 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
906 return irq_find_mapping(host
, hwirq
);
908 /* Check if revmap was allocated */
909 revmap
= host
->revmap_data
.linear
.revmap
;
910 if (unlikely(revmap
== NULL
))
911 return irq_find_mapping(host
, hwirq
);
913 /* Fill up revmap with slow path if no mapping found */
914 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
915 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
917 return revmap
[hwirq
];
920 unsigned int irq_alloc_virt(struct irq_host
*host
,
925 unsigned int i
, j
, found
= NO_IRQ
;
927 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
930 spin_lock_irqsave(&irq_big_lock
, flags
);
932 /* Use hint for 1 interrupt if any */
933 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
934 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
939 /* Look for count consecutive numbers in the allocatable
942 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
943 if (irq_map
[i
].host
!= NULL
)
949 found
= i
- count
+ 1;
953 if (found
== NO_IRQ
) {
954 spin_unlock_irqrestore(&irq_big_lock
, flags
);
958 for (i
= found
; i
< (found
+ count
); i
++) {
959 irq_map
[i
].hwirq
= host
->inval_irq
;
961 irq_map
[i
].host
= host
;
963 spin_unlock_irqrestore(&irq_big_lock
, flags
);
967 void irq_free_virt(unsigned int virq
, unsigned int count
)
972 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
973 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
975 spin_lock_irqsave(&irq_big_lock
, flags
);
976 for (i
= virq
; i
< (virq
+ count
); i
++) {
977 struct irq_host
*host
;
979 if (i
< NUM_ISA_INTERRUPTS
||
980 (virq
+ count
) > irq_virq_count
)
983 host
= irq_map
[i
].host
;
984 irq_map
[i
].hwirq
= host
->inval_irq
;
986 irq_map
[i
].host
= NULL
;
988 spin_unlock_irqrestore(&irq_big_lock
, flags
);
991 void irq_early_init(void)
995 for (i
= 0; i
< NR_IRQS
; i
++)
996 get_irq_desc(i
)->status
|= IRQ_NOREQUEST
;
999 /* We need to create the radix trees late */
1000 static int irq_late_init(void)
1006 * No mutual exclusion with respect to accessors of the tree is needed
1007 * here as the synchronization is done via the state variable
1008 * revmap_trees_allocated.
1010 list_for_each_entry(h
, &irq_hosts
, link
) {
1011 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
1012 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_KERNEL
);
1016 * Make sure the radix trees inits are visible before setting
1020 revmap_trees_allocated
= 1;
1023 * Insert the reverse mapping for those interrupts already present
1026 mutex_lock(&revmap_trees_mutex
);
1027 for (i
= 0; i
< irq_virq_count
; i
++) {
1028 if (irq_map
[i
].host
&&
1029 (irq_map
[i
].host
->revmap_type
== IRQ_HOST_MAP_TREE
))
1030 radix_tree_insert(&irq_map
[i
].host
->revmap_data
.tree
,
1031 irq_map
[i
].hwirq
, &irq_map
[i
]);
1033 mutex_unlock(&revmap_trees_mutex
);
1036 * Make sure the radix trees insertions are visible before setting
1040 revmap_trees_allocated
= 2;
1044 arch_initcall(irq_late_init
);
1046 #ifdef CONFIG_VIRQ_DEBUG
1047 static int virq_debug_show(struct seq_file
*m
, void *private)
1049 unsigned long flags
;
1050 struct irq_desc
*desc
;
1052 char none
[] = "none";
1055 seq_printf(m
, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1056 "chip name", "host name");
1058 for (i
= 1; i
< NR_IRQS
; i
++) {
1059 desc
= get_irq_desc(i
);
1060 spin_lock_irqsave(&desc
->lock
, flags
);
1062 if (desc
->action
&& desc
->action
->handler
) {
1063 seq_printf(m
, "%5d ", i
);
1064 seq_printf(m
, "0x%05lx ", virq_to_hw(i
));
1066 if (desc
->chip
&& desc
->chip
->typename
)
1067 p
= desc
->chip
->typename
;
1070 seq_printf(m
, "%-15s ", p
);
1072 if (irq_map
[i
].host
&& irq_map
[i
].host
->of_node
)
1073 p
= irq_map
[i
].host
->of_node
->full_name
;
1076 seq_printf(m
, "%s\n", p
);
1079 spin_unlock_irqrestore(&desc
->lock
, flags
);
1085 static int virq_debug_open(struct inode
*inode
, struct file
*file
)
1087 return single_open(file
, virq_debug_show
, inode
->i_private
);
1090 static const struct file_operations virq_debug_fops
= {
1091 .open
= virq_debug_open
,
1093 .llseek
= seq_lseek
,
1094 .release
= single_release
,
1097 static int __init
irq_debugfs_init(void)
1099 if (debugfs_create_file("virq_mapping", S_IRUGO
, powerpc_debugfs_root
,
1100 NULL
, &virq_debug_fops
) == NULL
)
1105 __initcall(irq_debugfs_init
);
1106 #endif /* CONFIG_VIRQ_DEBUG */
1109 static int __init
setup_noirqdistrib(char *str
)
1111 distribute_irqs
= 0;
1115 __setup("noirqdistrib", setup_noirqdistrib
);
1116 #endif /* CONFIG_PPC64 */