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>
56 #include <linux/perf_counter.h>
58 #include <asm/uaccess.h>
59 #include <asm/system.h>
61 #include <asm/pgtable.h>
63 #include <asm/cache.h>
65 #include <asm/ptrace.h>
66 #include <asm/machdep.h>
70 #include <asm/firmware.h>
71 #include <asm/lv1call.h>
74 int __irq_offset_value
;
75 static int ppc_spurious_interrupts
;
78 EXPORT_SYMBOL(__irq_offset_value
);
79 atomic_t ppc_n_lost_interrupts
;
82 extern int tau_initialized
;
83 extern int tau_interrupts(int);
85 #endif /* CONFIG_PPC32 */
88 EXPORT_SYMBOL(irq_desc
);
90 int distribute_irqs
= 1;
92 static inline notrace
unsigned long get_hard_enabled(void)
94 unsigned long enabled
;
96 __asm__
__volatile__("lbz %0,%1(13)"
97 : "=r" (enabled
) : "i" (offsetof(struct paca_struct
, hard_enabled
)));
102 static inline notrace
void set_soft_enabled(unsigned long enable
)
104 __asm__
__volatile__("stb %0,%1(13)"
105 : : "r" (enable
), "i" (offsetof(struct paca_struct
, soft_enabled
)));
108 notrace
void raw_local_irq_restore(unsigned long en
)
111 * get_paca()->soft_enabled = en;
112 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
113 * That was allowed before, and in such a case we do need to take care
114 * that gcc will set soft_enabled directly via r13, not choose to use
115 * an intermediate register, lest we're preempted to a different cpu.
117 set_soft_enabled(en
);
121 if (firmware_has_feature(FW_FEATURE_ISERIES
)) {
123 * Do we need to disable preemption here? Not really: in the
124 * unlikely event that we're preempted to a different cpu in
125 * between getting r13, loading its lppaca_ptr, and loading
126 * its any_int, we might call iseries_handle_interrupts without
127 * an interrupt pending on the new cpu, but that's no disaster,
128 * is it? And the business of preempting us off the old cpu
129 * would itself involve a local_irq_restore which handles the
130 * interrupt to that cpu.
132 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
133 * to avoid any preemption checking added into get_paca().
135 if (local_paca
->lppaca_ptr
->int_dword
.any_int
)
136 iseries_handle_interrupts();
139 if (test_perf_counter_pending()) {
140 clear_perf_counter_pending();
141 perf_counter_do_pending();
145 * if (get_paca()->hard_enabled) return;
146 * But again we need to take care that gcc gets hard_enabled directly
147 * via r13, not choose to use an intermediate register, lest we're
148 * preempted to a different cpu in between the two instructions.
150 if (get_hard_enabled())
154 * Need to hard-enable interrupts here. Since currently disabled,
155 * no need to take further asm precautions against preemption; but
156 * use local_paca instead of get_paca() to avoid preemption checking.
158 local_paca
->hard_enabled
= en
;
159 if ((int)mfspr(SPRN_DEC
) < 0)
163 * Force the delivery of pending soft-disabled interrupts on PS3.
164 * Any HV call will have this side effect.
166 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
168 lv1_get_version_info(&tmp
);
173 EXPORT_SYMBOL(raw_local_irq_restore
);
174 #endif /* CONFIG_PPC64 */
176 int show_interrupts(struct seq_file
*p
, void *v
)
178 int i
= *(loff_t
*)v
, j
;
179 struct irqaction
*action
;
180 struct irq_desc
*desc
;
185 for_each_online_cpu(j
)
186 seq_printf(p
, "CPU%d ", j
);
191 desc
= get_irq_desc(i
);
192 spin_lock_irqsave(&desc
->lock
, flags
);
193 action
= desc
->action
;
194 if (!action
|| !action
->handler
)
196 seq_printf(p
, "%3d: ", i
);
198 for_each_online_cpu(j
)
199 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
201 seq_printf(p
, "%10u ", kstat_irqs(i
));
202 #endif /* CONFIG_SMP */
204 seq_printf(p
, " %s ", desc
->chip
->typename
);
206 seq_puts(p
, " None ");
207 seq_printf(p
, "%s", (desc
->status
& IRQ_LEVEL
) ? "Level " : "Edge ");
208 seq_printf(p
, " %s", action
->name
);
209 for (action
= action
->next
; action
; action
= action
->next
)
210 seq_printf(p
, ", %s", action
->name
);
213 spin_unlock_irqrestore(&desc
->lock
, flags
);
214 } else if (i
== NR_IRQS
) {
215 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
216 if (tau_initialized
){
217 seq_puts(p
, "TAU: ");
218 for_each_online_cpu(j
)
219 seq_printf(p
, "%10u ", tau_interrupts(j
));
220 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
222 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT*/
223 seq_printf(p
, "BAD: %10u\n", ppc_spurious_interrupts
);
228 #ifdef CONFIG_HOTPLUG_CPU
229 void fixup_irqs(cpumask_t map
)
237 if (irq_desc
[irq
].status
& IRQ_PER_CPU
)
240 cpumask_and(&mask
, irq_desc
[irq
].affinity
, &map
);
241 if (any_online_cpu(mask
) == NR_CPUS
) {
242 printk("Breaking affinity for irq %i\n", irq
);
245 if (irq_desc
[irq
].chip
->set_affinity
)
246 irq_desc
[irq
].chip
->set_affinity(irq
, &mask
);
247 else if (irq_desc
[irq
].action
&& !(warned
++))
248 printk("Cannot set affinity for irq %i\n", irq
);
257 void do_IRQ(struct pt_regs
*regs
)
259 struct pt_regs
*old_regs
= set_irq_regs(regs
);
261 #ifdef CONFIG_IRQSTACKS
262 struct thread_info
*curtp
, *irqtp
;
267 #ifdef CONFIG_DEBUG_STACKOVERFLOW
268 /* Debugging check for stack overflow: is there less than 2KB free? */
272 sp
= __get_SP() & (THREAD_SIZE
-1);
274 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
275 printk("do_IRQ: stack overflow: %ld\n",
276 sp
- sizeof(struct thread_info
));
283 * Every platform is required to implement ppc_md.get_irq.
284 * This function will either return an irq number or NO_IRQ to
285 * indicate there are no more pending.
286 * The value NO_IRQ_IGNORE is for buggy hardware and means that this
287 * IRQ has already been handled. -- Tom
289 irq
= ppc_md
.get_irq();
291 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
) {
292 #ifdef CONFIG_IRQSTACKS
293 /* Switch to the irq stack to handle this */
294 curtp
= current_thread_info();
295 irqtp
= hardirq_ctx
[smp_processor_id()];
296 if (curtp
!= irqtp
) {
297 struct irq_desc
*desc
= irq_desc
+ irq
;
298 void *handler
= desc
->handle_irq
;
299 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
302 irqtp
->task
= curtp
->task
;
305 /* Copy the softirq bits in preempt_count so that the
306 * softirq checks work in the hardirq context.
308 irqtp
->preempt_count
=
309 (irqtp
->preempt_count
& ~SOFTIRQ_MASK
) |
310 (curtp
->preempt_count
& SOFTIRQ_MASK
);
312 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
313 _ALIGN_UP(sizeof(struct thread_info
), 16);
314 call_handle_irq(irq
, desc
, irqtp
, handler
);
315 current
->thread
.ksp_limit
= saved_sp_limit
;
319 /* Set any flag that may have been set on the
323 set_bits(irqtp
->flags
, &curtp
->flags
);
326 generic_handle_irq(irq
);
327 } else if (irq
!= NO_IRQ_IGNORE
)
328 /* That's not SMP safe ... but who cares ? */
329 ppc_spurious_interrupts
++;
332 set_irq_regs(old_regs
);
334 #ifdef CONFIG_PPC_ISERIES
335 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
336 get_lppaca()->int_dword
.fields
.decr_int
) {
337 get_lppaca()->int_dword
.fields
.decr_int
= 0;
338 /* Signal a fake decrementer interrupt */
339 timer_interrupt(regs
);
344 void __init
init_IRQ(void)
354 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
355 struct thread_info
*critirq_ctx
[NR_CPUS
] __read_mostly
;
356 struct thread_info
*dbgirq_ctx
[NR_CPUS
] __read_mostly
;
357 struct thread_info
*mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
359 void exc_lvl_ctx_init(void)
361 struct thread_info
*tp
;
364 for_each_possible_cpu(i
) {
365 memset((void *)critirq_ctx
[i
], 0, THREAD_SIZE
);
368 tp
->preempt_count
= 0;
371 memset((void *)dbgirq_ctx
[i
], 0, THREAD_SIZE
);
374 tp
->preempt_count
= 0;
376 memset((void *)mcheckirq_ctx
[i
], 0, THREAD_SIZE
);
377 tp
= mcheckirq_ctx
[i
];
379 tp
->preempt_count
= HARDIRQ_OFFSET
;
385 #ifdef CONFIG_IRQSTACKS
386 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
387 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
389 void irq_ctx_init(void)
391 struct thread_info
*tp
;
394 for_each_possible_cpu(i
) {
395 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
398 tp
->preempt_count
= 0;
400 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
403 tp
->preempt_count
= HARDIRQ_OFFSET
;
407 static inline void do_softirq_onstack(void)
409 struct thread_info
*curtp
, *irqtp
;
410 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
412 curtp
= current_thread_info();
413 irqtp
= softirq_ctx
[smp_processor_id()];
414 irqtp
->task
= curtp
->task
;
415 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
416 _ALIGN_UP(sizeof(struct thread_info
), 16);
417 call_do_softirq(irqtp
);
418 current
->thread
.ksp_limit
= saved_sp_limit
;
423 #define do_softirq_onstack() __do_softirq()
424 #endif /* CONFIG_IRQSTACKS */
426 void do_softirq(void)
433 local_irq_save(flags
);
435 if (local_softirq_pending())
436 do_softirq_onstack();
438 local_irq_restore(flags
);
443 * IRQ controller and virtual interrupts
446 static LIST_HEAD(irq_hosts
);
447 static DEFINE_SPINLOCK(irq_big_lock
);
448 static unsigned int revmap_trees_allocated
;
449 static DEFINE_MUTEX(revmap_trees_mutex
);
450 struct irq_map_entry irq_map
[NR_IRQS
];
451 static unsigned int irq_virq_count
= NR_IRQS
;
452 static struct irq_host
*irq_default_host
;
454 irq_hw_number_t
virq_to_hw(unsigned int virq
)
456 return irq_map
[virq
].hwirq
;
458 EXPORT_SYMBOL_GPL(virq_to_hw
);
460 static int default_irq_host_match(struct irq_host
*h
, struct device_node
*np
)
462 return h
->of_node
!= NULL
&& h
->of_node
== np
;
465 struct irq_host
*irq_alloc_host(struct device_node
*of_node
,
466 unsigned int revmap_type
,
467 unsigned int revmap_arg
,
468 struct irq_host_ops
*ops
,
469 irq_hw_number_t inval_irq
)
471 struct irq_host
*host
;
472 unsigned int size
= sizeof(struct irq_host
);
477 /* Allocate structure and revmap table if using linear mapping */
478 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
479 size
+= revmap_arg
* sizeof(unsigned int);
480 host
= zalloc_maybe_bootmem(size
, GFP_KERNEL
);
485 host
->revmap_type
= revmap_type
;
486 host
->inval_irq
= inval_irq
;
488 host
->of_node
= of_node_get(of_node
);
490 if (host
->ops
->match
== NULL
)
491 host
->ops
->match
= default_irq_host_match
;
493 spin_lock_irqsave(&irq_big_lock
, flags
);
495 /* If it's a legacy controller, check for duplicates and
496 * mark it as allocated (we use irq 0 host pointer for that
498 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
499 if (irq_map
[0].host
!= NULL
) {
500 spin_unlock_irqrestore(&irq_big_lock
, flags
);
501 /* If we are early boot, we can't free the structure,
503 * this will be fixed once slab is made available early
504 * instead of the current cruft
510 irq_map
[0].host
= host
;
513 list_add(&host
->link
, &irq_hosts
);
514 spin_unlock_irqrestore(&irq_big_lock
, flags
);
516 /* Additional setups per revmap type */
517 switch(revmap_type
) {
518 case IRQ_HOST_MAP_LEGACY
:
519 /* 0 is always the invalid number for legacy */
521 /* setup us as the host for all legacy interrupts */
522 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
523 irq_map
[i
].hwirq
= i
;
525 irq_map
[i
].host
= host
;
528 /* Clear norequest flags */
529 get_irq_desc(i
)->status
&= ~IRQ_NOREQUEST
;
531 /* Legacy flags are left to default at this point,
532 * one can then use irq_create_mapping() to
533 * explicitly change them
535 ops
->map(host
, i
, i
);
538 case IRQ_HOST_MAP_LINEAR
:
539 rmap
= (unsigned int *)(host
+ 1);
540 for (i
= 0; i
< revmap_arg
; i
++)
542 host
->revmap_data
.linear
.size
= revmap_arg
;
544 host
->revmap_data
.linear
.revmap
= rmap
;
550 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
555 struct irq_host
*irq_find_host(struct device_node
*node
)
557 struct irq_host
*h
, *found
= NULL
;
560 /* We might want to match the legacy controller last since
561 * it might potentially be set to match all interrupts in
562 * the absence of a device node. This isn't a problem so far
565 spin_lock_irqsave(&irq_big_lock
, flags
);
566 list_for_each_entry(h
, &irq_hosts
, link
)
567 if (h
->ops
->match(h
, node
)) {
571 spin_unlock_irqrestore(&irq_big_lock
, flags
);
574 EXPORT_SYMBOL_GPL(irq_find_host
);
576 void irq_set_default_host(struct irq_host
*host
)
578 pr_debug("irq: Default host set to @0x%p\n", host
);
580 irq_default_host
= host
;
583 void irq_set_virq_count(unsigned int count
)
585 pr_debug("irq: Trying to set virq count to %d\n", count
);
587 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
589 irq_virq_count
= count
;
592 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
593 irq_hw_number_t hwirq
)
595 /* Clear IRQ_NOREQUEST flag */
596 get_irq_desc(virq
)->status
&= ~IRQ_NOREQUEST
;
600 irq_map
[virq
].hwirq
= hwirq
;
603 if (host
->ops
->map(host
, virq
, hwirq
)) {
604 pr_debug("irq: -> mapping failed, freeing\n");
605 irq_free_virt(virq
, 1);
612 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
617 host
= irq_default_host
;
619 BUG_ON(host
== NULL
);
620 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
622 virq
= irq_alloc_virt(host
, 1, 0);
623 if (virq
== NO_IRQ
) {
624 pr_debug("irq: create_direct virq allocation failed\n");
628 pr_debug("irq: create_direct obtained virq %d\n", virq
);
630 if (irq_setup_virq(host
, virq
, virq
))
636 unsigned int irq_create_mapping(struct irq_host
*host
,
637 irq_hw_number_t hwirq
)
639 unsigned int virq
, hint
;
641 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
643 /* Look for default host if nececssary */
645 host
= irq_default_host
;
647 printk(KERN_WARNING
"irq_create_mapping called for"
648 " NULL host, hwirq=%lx\n", hwirq
);
652 pr_debug("irq: -> using host @%p\n", host
);
654 /* Check if mapping already exist, if it does, call
655 * host->ops->map() to update the flags
657 virq
= irq_find_mapping(host
, hwirq
);
658 if (virq
!= NO_IRQ
) {
659 if (host
->ops
->remap
)
660 host
->ops
->remap(host
, virq
, hwirq
);
661 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
665 /* Get a virtual interrupt number */
666 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
668 virq
= (unsigned int)hwirq
;
669 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
673 /* Allocate a virtual interrupt number */
674 hint
= hwirq
% irq_virq_count
;
675 virq
= irq_alloc_virt(host
, 1, hint
);
676 if (virq
== NO_IRQ
) {
677 pr_debug("irq: -> virq allocation failed\n");
682 if (irq_setup_virq(host
, virq
, hwirq
))
685 printk(KERN_DEBUG
"irq: irq %lu on host %s mapped to virtual irq %u\n",
686 hwirq
, host
->of_node
? host
->of_node
->full_name
: "null", virq
);
690 EXPORT_SYMBOL_GPL(irq_create_mapping
);
692 unsigned int irq_create_of_mapping(struct device_node
*controller
,
693 u32
*intspec
, unsigned int intsize
)
695 struct irq_host
*host
;
696 irq_hw_number_t hwirq
;
697 unsigned int type
= IRQ_TYPE_NONE
;
700 if (controller
== NULL
)
701 host
= irq_default_host
;
703 host
= irq_find_host(controller
);
705 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
706 controller
->full_name
);
710 /* If host has no translation, then we assume interrupt line */
711 if (host
->ops
->xlate
== NULL
)
714 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
720 virq
= irq_create_mapping(host
, hwirq
);
724 /* Set type if specified and different than the current one */
725 if (type
!= IRQ_TYPE_NONE
&&
726 type
!= (get_irq_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
727 set_irq_type(virq
, type
);
730 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
732 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
736 if (of_irq_map_one(dev
, index
, &oirq
))
739 return irq_create_of_mapping(oirq
.controller
, oirq
.specifier
,
742 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
744 void irq_dispose_mapping(unsigned int virq
)
746 struct irq_host
*host
;
747 irq_hw_number_t hwirq
;
752 host
= irq_map
[virq
].host
;
753 WARN_ON (host
== NULL
);
757 /* Never unmap legacy interrupts */
758 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
761 /* remove chip and handler */
762 set_irq_chip_and_handler(virq
, NULL
, NULL
);
764 /* Make sure it's completed */
765 synchronize_irq(virq
);
767 /* Tell the PIC about it */
768 if (host
->ops
->unmap
)
769 host
->ops
->unmap(host
, virq
);
772 /* Clear reverse map */
773 hwirq
= irq_map
[virq
].hwirq
;
774 switch(host
->revmap_type
) {
775 case IRQ_HOST_MAP_LINEAR
:
776 if (hwirq
< host
->revmap_data
.linear
.size
)
777 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
779 case IRQ_HOST_MAP_TREE
:
781 * Check if radix tree allocated yet, if not then nothing to
785 if (revmap_trees_allocated
< 1)
787 mutex_lock(&revmap_trees_mutex
);
788 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
789 mutex_unlock(&revmap_trees_mutex
);
795 irq_map
[virq
].hwirq
= host
->inval_irq
;
798 get_irq_desc(virq
)->status
|= IRQ_NOREQUEST
;
801 irq_free_virt(virq
, 1);
803 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
805 unsigned int irq_find_mapping(struct irq_host
*host
,
806 irq_hw_number_t hwirq
)
809 unsigned int hint
= hwirq
% irq_virq_count
;
811 /* Look for default host if nececssary */
813 host
= irq_default_host
;
817 /* legacy -> bail early */
818 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
821 /* Slow path does a linear search of the map */
822 if (hint
< NUM_ISA_INTERRUPTS
)
823 hint
= NUM_ISA_INTERRUPTS
;
826 if (irq_map
[i
].host
== host
&&
827 irq_map
[i
].hwirq
== hwirq
)
830 if (i
>= irq_virq_count
)
831 i
= NUM_ISA_INTERRUPTS
;
835 EXPORT_SYMBOL_GPL(irq_find_mapping
);
838 unsigned int irq_radix_revmap_lookup(struct irq_host
*host
,
839 irq_hw_number_t hwirq
)
841 struct irq_map_entry
*ptr
;
844 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
847 * Check if the radix tree exists and has bee initialized.
848 * If not, we fallback to slow mode
850 if (revmap_trees_allocated
< 2)
851 return irq_find_mapping(host
, hwirq
);
853 /* Now try to resolve */
855 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
856 * as it's referencing an entry in the static irq_map table.
858 ptr
= radix_tree_lookup(&host
->revmap_data
.tree
, hwirq
);
861 * If found in radix tree, then fine.
862 * Else fallback to linear lookup - this should not happen in practice
863 * as it means that we failed to insert the node in the radix tree.
866 virq
= ptr
- irq_map
;
868 virq
= irq_find_mapping(host
, hwirq
);
873 void irq_radix_revmap_insert(struct irq_host
*host
, unsigned int virq
,
874 irq_hw_number_t hwirq
)
877 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
880 * Check if the radix tree exists yet.
881 * If not, then the irq will be inserted into the tree when it gets
885 if (revmap_trees_allocated
< 1)
888 if (virq
!= NO_IRQ
) {
889 mutex_lock(&revmap_trees_mutex
);
890 radix_tree_insert(&host
->revmap_data
.tree
, hwirq
,
892 mutex_unlock(&revmap_trees_mutex
);
896 unsigned int irq_linear_revmap(struct irq_host
*host
,
897 irq_hw_number_t hwirq
)
899 unsigned int *revmap
;
901 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
903 /* Check revmap bounds */
904 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
905 return irq_find_mapping(host
, hwirq
);
907 /* Check if revmap was allocated */
908 revmap
= host
->revmap_data
.linear
.revmap
;
909 if (unlikely(revmap
== NULL
))
910 return irq_find_mapping(host
, hwirq
);
912 /* Fill up revmap with slow path if no mapping found */
913 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
914 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
916 return revmap
[hwirq
];
919 unsigned int irq_alloc_virt(struct irq_host
*host
,
924 unsigned int i
, j
, found
= NO_IRQ
;
926 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
929 spin_lock_irqsave(&irq_big_lock
, flags
);
931 /* Use hint for 1 interrupt if any */
932 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
933 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
938 /* Look for count consecutive numbers in the allocatable
941 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
942 if (irq_map
[i
].host
!= NULL
)
948 found
= i
- count
+ 1;
952 if (found
== NO_IRQ
) {
953 spin_unlock_irqrestore(&irq_big_lock
, flags
);
957 for (i
= found
; i
< (found
+ count
); i
++) {
958 irq_map
[i
].hwirq
= host
->inval_irq
;
960 irq_map
[i
].host
= host
;
962 spin_unlock_irqrestore(&irq_big_lock
, flags
);
966 void irq_free_virt(unsigned int virq
, unsigned int count
)
971 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
972 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
974 spin_lock_irqsave(&irq_big_lock
, flags
);
975 for (i
= virq
; i
< (virq
+ count
); i
++) {
976 struct irq_host
*host
;
978 if (i
< NUM_ISA_INTERRUPTS
||
979 (virq
+ count
) > irq_virq_count
)
982 host
= irq_map
[i
].host
;
983 irq_map
[i
].hwirq
= host
->inval_irq
;
985 irq_map
[i
].host
= NULL
;
987 spin_unlock_irqrestore(&irq_big_lock
, flags
);
990 void irq_early_init(void)
994 for (i
= 0; i
< NR_IRQS
; i
++)
995 get_irq_desc(i
)->status
|= IRQ_NOREQUEST
;
998 /* We need to create the radix trees late */
999 static int irq_late_init(void)
1005 * No mutual exclusion with respect to accessors of the tree is needed
1006 * here as the synchronization is done via the state variable
1007 * revmap_trees_allocated.
1009 list_for_each_entry(h
, &irq_hosts
, link
) {
1010 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
1011 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_KERNEL
);
1015 * Make sure the radix trees inits are visible before setting
1019 revmap_trees_allocated
= 1;
1022 * Insert the reverse mapping for those interrupts already present
1025 mutex_lock(&revmap_trees_mutex
);
1026 for (i
= 0; i
< irq_virq_count
; i
++) {
1027 if (irq_map
[i
].host
&&
1028 (irq_map
[i
].host
->revmap_type
== IRQ_HOST_MAP_TREE
))
1029 radix_tree_insert(&irq_map
[i
].host
->revmap_data
.tree
,
1030 irq_map
[i
].hwirq
, &irq_map
[i
]);
1032 mutex_unlock(&revmap_trees_mutex
);
1035 * Make sure the radix trees insertions are visible before setting
1039 revmap_trees_allocated
= 2;
1043 arch_initcall(irq_late_init
);
1045 #ifdef CONFIG_VIRQ_DEBUG
1046 static int virq_debug_show(struct seq_file
*m
, void *private)
1048 unsigned long flags
;
1049 struct irq_desc
*desc
;
1051 char none
[] = "none";
1054 seq_printf(m
, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1055 "chip name", "host name");
1057 for (i
= 1; i
< NR_IRQS
; i
++) {
1058 desc
= get_irq_desc(i
);
1059 spin_lock_irqsave(&desc
->lock
, flags
);
1061 if (desc
->action
&& desc
->action
->handler
) {
1062 seq_printf(m
, "%5d ", i
);
1063 seq_printf(m
, "0x%05lx ", virq_to_hw(i
));
1065 if (desc
->chip
&& desc
->chip
->typename
)
1066 p
= desc
->chip
->typename
;
1069 seq_printf(m
, "%-15s ", p
);
1071 if (irq_map
[i
].host
&& irq_map
[i
].host
->of_node
)
1072 p
= irq_map
[i
].host
->of_node
->full_name
;
1075 seq_printf(m
, "%s\n", p
);
1078 spin_unlock_irqrestore(&desc
->lock
, flags
);
1084 static int virq_debug_open(struct inode
*inode
, struct file
*file
)
1086 return single_open(file
, virq_debug_show
, inode
->i_private
);
1089 static const struct file_operations virq_debug_fops
= {
1090 .open
= virq_debug_open
,
1092 .llseek
= seq_lseek
,
1093 .release
= single_release
,
1096 static int __init
irq_debugfs_init(void)
1098 if (debugfs_create_file("virq_mapping", S_IRUGO
, powerpc_debugfs_root
,
1099 NULL
, &virq_debug_fops
) == NULL
)
1104 __initcall(irq_debugfs_init
);
1105 #endif /* CONFIG_VIRQ_DEBUG */
1108 static int __init
setup_noirqdistrib(char *str
)
1110 distribute_irqs
= 0;
1114 __setup("noirqdistrib", setup_noirqdistrib
);
1115 #endif /* CONFIG_PPC64 */