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_event.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>
73 #define CREATE_TRACE_POINTS
74 #include <asm/trace.h>
76 int __irq_offset_value
;
77 static int ppc_spurious_interrupts
;
80 EXPORT_SYMBOL(__irq_offset_value
);
81 atomic_t ppc_n_lost_interrupts
;
84 extern int tau_initialized
;
85 extern int tau_interrupts(int);
87 #endif /* CONFIG_PPC32 */
90 EXPORT_SYMBOL(irq_desc
);
92 int distribute_irqs
= 1;
94 static inline notrace
unsigned long get_hard_enabled(void)
96 unsigned long enabled
;
98 __asm__
__volatile__("lbz %0,%1(13)"
99 : "=r" (enabled
) : "i" (offsetof(struct paca_struct
, hard_enabled
)));
104 static inline notrace
void set_soft_enabled(unsigned long enable
)
106 __asm__
__volatile__("stb %0,%1(13)"
107 : : "r" (enable
), "i" (offsetof(struct paca_struct
, soft_enabled
)));
110 notrace
void raw_local_irq_restore(unsigned long en
)
113 * get_paca()->soft_enabled = en;
114 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
115 * That was allowed before, and in such a case we do need to take care
116 * that gcc will set soft_enabled directly via r13, not choose to use
117 * an intermediate register, lest we're preempted to a different cpu.
119 set_soft_enabled(en
);
123 #ifdef CONFIG_PPC_STD_MMU_64
124 if (firmware_has_feature(FW_FEATURE_ISERIES
)) {
126 * Do we need to disable preemption here? Not really: in the
127 * unlikely event that we're preempted to a different cpu in
128 * between getting r13, loading its lppaca_ptr, and loading
129 * its any_int, we might call iseries_handle_interrupts without
130 * an interrupt pending on the new cpu, but that's no disaster,
131 * is it? And the business of preempting us off the old cpu
132 * would itself involve a local_irq_restore which handles the
133 * interrupt to that cpu.
135 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
136 * to avoid any preemption checking added into get_paca().
138 if (local_paca
->lppaca_ptr
->int_dword
.any_int
)
139 iseries_handle_interrupts();
141 #endif /* CONFIG_PPC_STD_MMU_64 */
143 if (test_perf_event_pending()) {
144 clear_perf_event_pending();
145 perf_event_do_pending();
149 * if (get_paca()->hard_enabled) return;
150 * But again we need to take care that gcc gets hard_enabled directly
151 * via r13, not choose to use an intermediate register, lest we're
152 * preempted to a different cpu in between the two instructions.
154 if (get_hard_enabled())
158 * Need to hard-enable interrupts here. Since currently disabled,
159 * no need to take further asm precautions against preemption; but
160 * use local_paca instead of get_paca() to avoid preemption checking.
162 local_paca
->hard_enabled
= en
;
163 if ((int)mfspr(SPRN_DEC
) < 0)
167 * Force the delivery of pending soft-disabled interrupts on PS3.
168 * Any HV call will have this side effect.
170 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
172 lv1_get_version_info(&tmp
);
177 EXPORT_SYMBOL(raw_local_irq_restore
);
178 #endif /* CONFIG_PPC64 */
180 int show_interrupts(struct seq_file
*p
, void *v
)
182 int i
= *(loff_t
*)v
, j
;
183 struct irqaction
*action
;
184 struct irq_desc
*desc
;
189 for_each_online_cpu(j
)
190 seq_printf(p
, "CPU%d ", j
);
195 desc
= get_irq_desc(i
);
196 spin_lock_irqsave(&desc
->lock
, flags
);
197 action
= desc
->action
;
198 if (!action
|| !action
->handler
)
200 seq_printf(p
, "%3d: ", i
);
202 for_each_online_cpu(j
)
203 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
205 seq_printf(p
, "%10u ", kstat_irqs(i
));
206 #endif /* CONFIG_SMP */
208 seq_printf(p
, " %s ", desc
->chip
->typename
);
210 seq_puts(p
, " None ");
211 seq_printf(p
, "%s", (desc
->status
& IRQ_LEVEL
) ? "Level " : "Edge ");
212 seq_printf(p
, " %s", action
->name
);
213 for (action
= action
->next
; action
; action
= action
->next
)
214 seq_printf(p
, ", %s", action
->name
);
217 spin_unlock_irqrestore(&desc
->lock
, flags
);
218 } else if (i
== NR_IRQS
) {
219 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
220 if (tau_initialized
){
221 seq_puts(p
, "TAU: ");
222 for_each_online_cpu(j
)
223 seq_printf(p
, "%10u ", tau_interrupts(j
));
224 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
226 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT*/
227 seq_printf(p
, "BAD: %10u\n", ppc_spurious_interrupts
);
232 #ifdef CONFIG_HOTPLUG_CPU
233 void fixup_irqs(cpumask_t map
)
241 if (irq_desc
[irq
].status
& IRQ_PER_CPU
)
244 cpumask_and(&mask
, irq_desc
[irq
].affinity
, &map
);
245 if (any_online_cpu(mask
) == NR_CPUS
) {
246 printk("Breaking affinity for irq %i\n", irq
);
249 if (irq_desc
[irq
].chip
->set_affinity
)
250 irq_desc
[irq
].chip
->set_affinity(irq
, &mask
);
251 else if (irq_desc
[irq
].action
&& !(warned
++))
252 printk("Cannot set affinity for irq %i\n", irq
);
261 #ifdef CONFIG_IRQSTACKS
262 static inline void handle_one_irq(unsigned int irq
)
264 struct thread_info
*curtp
, *irqtp
;
265 unsigned long saved_sp_limit
;
266 struct irq_desc
*desc
;
268 /* Switch to the irq stack to handle this */
269 curtp
= current_thread_info();
270 irqtp
= hardirq_ctx
[smp_processor_id()];
272 if (curtp
== irqtp
) {
273 /* We're already on the irq stack, just handle it */
274 generic_handle_irq(irq
);
278 desc
= irq_desc
+ irq
;
279 saved_sp_limit
= current
->thread
.ksp_limit
;
281 irqtp
->task
= curtp
->task
;
284 /* Copy the softirq bits in preempt_count so that the
285 * softirq checks work in the hardirq context. */
286 irqtp
->preempt_count
= (irqtp
->preempt_count
& ~SOFTIRQ_MASK
) |
287 (curtp
->preempt_count
& SOFTIRQ_MASK
);
289 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
290 _ALIGN_UP(sizeof(struct thread_info
), 16);
292 call_handle_irq(irq
, desc
, irqtp
, desc
->handle_irq
);
293 current
->thread
.ksp_limit
= saved_sp_limit
;
296 /* Set any flag that may have been set on the
300 set_bits(irqtp
->flags
, &curtp
->flags
);
303 static inline void handle_one_irq(unsigned int irq
)
305 generic_handle_irq(irq
);
309 static inline void check_stack_overflow(void)
311 #ifdef CONFIG_DEBUG_STACKOVERFLOW
314 sp
= __get_SP() & (THREAD_SIZE
-1);
316 /* check for stack overflow: is there less than 2KB free? */
317 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
318 printk("do_IRQ: stack overflow: %ld\n",
319 sp
- sizeof(struct thread_info
));
325 void do_IRQ(struct pt_regs
*regs
)
327 struct pt_regs
*old_regs
= set_irq_regs(regs
);
330 trace_irq_entry(regs
);
334 check_stack_overflow();
336 irq
= ppc_md
.get_irq();
338 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
)
340 else if (irq
!= NO_IRQ_IGNORE
)
341 /* That's not SMP safe ... but who cares ? */
342 ppc_spurious_interrupts
++;
345 set_irq_regs(old_regs
);
347 #ifdef CONFIG_PPC_ISERIES
348 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
349 get_lppaca()->int_dword
.fields
.decr_int
) {
350 get_lppaca()->int_dword
.fields
.decr_int
= 0;
351 /* Signal a fake decrementer interrupt */
352 timer_interrupt(regs
);
356 trace_irq_exit(regs
);
359 void __init
init_IRQ(void)
369 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
370 struct thread_info
*critirq_ctx
[NR_CPUS
] __read_mostly
;
371 struct thread_info
*dbgirq_ctx
[NR_CPUS
] __read_mostly
;
372 struct thread_info
*mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
374 void exc_lvl_ctx_init(void)
376 struct thread_info
*tp
;
379 for_each_possible_cpu(i
) {
380 memset((void *)critirq_ctx
[i
], 0, THREAD_SIZE
);
383 tp
->preempt_count
= 0;
386 memset((void *)dbgirq_ctx
[i
], 0, THREAD_SIZE
);
389 tp
->preempt_count
= 0;
391 memset((void *)mcheckirq_ctx
[i
], 0, THREAD_SIZE
);
392 tp
= mcheckirq_ctx
[i
];
394 tp
->preempt_count
= HARDIRQ_OFFSET
;
400 #ifdef CONFIG_IRQSTACKS
401 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
402 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
404 void irq_ctx_init(void)
406 struct thread_info
*tp
;
409 for_each_possible_cpu(i
) {
410 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
413 tp
->preempt_count
= 0;
415 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
418 tp
->preempt_count
= HARDIRQ_OFFSET
;
422 static inline void do_softirq_onstack(void)
424 struct thread_info
*curtp
, *irqtp
;
425 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
427 curtp
= current_thread_info();
428 irqtp
= softirq_ctx
[smp_processor_id()];
429 irqtp
->task
= curtp
->task
;
430 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
431 _ALIGN_UP(sizeof(struct thread_info
), 16);
432 call_do_softirq(irqtp
);
433 current
->thread
.ksp_limit
= saved_sp_limit
;
438 #define do_softirq_onstack() __do_softirq()
439 #endif /* CONFIG_IRQSTACKS */
441 void do_softirq(void)
448 local_irq_save(flags
);
450 if (local_softirq_pending())
451 do_softirq_onstack();
453 local_irq_restore(flags
);
458 * IRQ controller and virtual interrupts
461 static LIST_HEAD(irq_hosts
);
462 static DEFINE_SPINLOCK(irq_big_lock
);
463 static unsigned int revmap_trees_allocated
;
464 static DEFINE_MUTEX(revmap_trees_mutex
);
465 struct irq_map_entry irq_map
[NR_IRQS
];
466 static unsigned int irq_virq_count
= NR_IRQS
;
467 static struct irq_host
*irq_default_host
;
469 irq_hw_number_t
virq_to_hw(unsigned int virq
)
471 return irq_map
[virq
].hwirq
;
473 EXPORT_SYMBOL_GPL(virq_to_hw
);
475 static int default_irq_host_match(struct irq_host
*h
, struct device_node
*np
)
477 return h
->of_node
!= NULL
&& h
->of_node
== np
;
480 struct irq_host
*irq_alloc_host(struct device_node
*of_node
,
481 unsigned int revmap_type
,
482 unsigned int revmap_arg
,
483 struct irq_host_ops
*ops
,
484 irq_hw_number_t inval_irq
)
486 struct irq_host
*host
;
487 unsigned int size
= sizeof(struct irq_host
);
492 /* Allocate structure and revmap table if using linear mapping */
493 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
494 size
+= revmap_arg
* sizeof(unsigned int);
495 host
= zalloc_maybe_bootmem(size
, GFP_KERNEL
);
500 host
->revmap_type
= revmap_type
;
501 host
->inval_irq
= inval_irq
;
503 host
->of_node
= of_node_get(of_node
);
505 if (host
->ops
->match
== NULL
)
506 host
->ops
->match
= default_irq_host_match
;
508 spin_lock_irqsave(&irq_big_lock
, flags
);
510 /* If it's a legacy controller, check for duplicates and
511 * mark it as allocated (we use irq 0 host pointer for that
513 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
514 if (irq_map
[0].host
!= NULL
) {
515 spin_unlock_irqrestore(&irq_big_lock
, flags
);
516 /* If we are early boot, we can't free the structure,
518 * this will be fixed once slab is made available early
519 * instead of the current cruft
525 irq_map
[0].host
= host
;
528 list_add(&host
->link
, &irq_hosts
);
529 spin_unlock_irqrestore(&irq_big_lock
, flags
);
531 /* Additional setups per revmap type */
532 switch(revmap_type
) {
533 case IRQ_HOST_MAP_LEGACY
:
534 /* 0 is always the invalid number for legacy */
536 /* setup us as the host for all legacy interrupts */
537 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
538 irq_map
[i
].hwirq
= i
;
540 irq_map
[i
].host
= host
;
543 /* Clear norequest flags */
544 get_irq_desc(i
)->status
&= ~IRQ_NOREQUEST
;
546 /* Legacy flags are left to default at this point,
547 * one can then use irq_create_mapping() to
548 * explicitly change them
550 ops
->map(host
, i
, i
);
553 case IRQ_HOST_MAP_LINEAR
:
554 rmap
= (unsigned int *)(host
+ 1);
555 for (i
= 0; i
< revmap_arg
; i
++)
557 host
->revmap_data
.linear
.size
= revmap_arg
;
559 host
->revmap_data
.linear
.revmap
= rmap
;
565 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
570 struct irq_host
*irq_find_host(struct device_node
*node
)
572 struct irq_host
*h
, *found
= NULL
;
575 /* We might want to match the legacy controller last since
576 * it might potentially be set to match all interrupts in
577 * the absence of a device node. This isn't a problem so far
580 spin_lock_irqsave(&irq_big_lock
, flags
);
581 list_for_each_entry(h
, &irq_hosts
, link
)
582 if (h
->ops
->match(h
, node
)) {
586 spin_unlock_irqrestore(&irq_big_lock
, flags
);
589 EXPORT_SYMBOL_GPL(irq_find_host
);
591 void irq_set_default_host(struct irq_host
*host
)
593 pr_debug("irq: Default host set to @0x%p\n", host
);
595 irq_default_host
= host
;
598 void irq_set_virq_count(unsigned int count
)
600 pr_debug("irq: Trying to set virq count to %d\n", count
);
602 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
604 irq_virq_count
= count
;
607 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
608 irq_hw_number_t hwirq
)
610 /* Clear IRQ_NOREQUEST flag */
611 get_irq_desc(virq
)->status
&= ~IRQ_NOREQUEST
;
615 irq_map
[virq
].hwirq
= hwirq
;
618 if (host
->ops
->map(host
, virq
, hwirq
)) {
619 pr_debug("irq: -> mapping failed, freeing\n");
620 irq_free_virt(virq
, 1);
627 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
632 host
= irq_default_host
;
634 BUG_ON(host
== NULL
);
635 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
637 virq
= irq_alloc_virt(host
, 1, 0);
638 if (virq
== NO_IRQ
) {
639 pr_debug("irq: create_direct virq allocation failed\n");
643 pr_debug("irq: create_direct obtained virq %d\n", virq
);
645 if (irq_setup_virq(host
, virq
, virq
))
651 unsigned int irq_create_mapping(struct irq_host
*host
,
652 irq_hw_number_t hwirq
)
654 unsigned int virq
, hint
;
656 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
658 /* Look for default host if nececssary */
660 host
= irq_default_host
;
662 printk(KERN_WARNING
"irq_create_mapping called for"
663 " NULL host, hwirq=%lx\n", hwirq
);
667 pr_debug("irq: -> using host @%p\n", host
);
669 /* Check if mapping already exist, if it does, call
670 * host->ops->map() to update the flags
672 virq
= irq_find_mapping(host
, hwirq
);
673 if (virq
!= NO_IRQ
) {
674 if (host
->ops
->remap
)
675 host
->ops
->remap(host
, virq
, hwirq
);
676 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
680 /* Get a virtual interrupt number */
681 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
683 virq
= (unsigned int)hwirq
;
684 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
688 /* Allocate a virtual interrupt number */
689 hint
= hwirq
% irq_virq_count
;
690 virq
= irq_alloc_virt(host
, 1, hint
);
691 if (virq
== NO_IRQ
) {
692 pr_debug("irq: -> virq allocation failed\n");
697 if (irq_setup_virq(host
, virq
, hwirq
))
700 printk(KERN_DEBUG
"irq: irq %lu on host %s mapped to virtual irq %u\n",
701 hwirq
, host
->of_node
? host
->of_node
->full_name
: "null", virq
);
705 EXPORT_SYMBOL_GPL(irq_create_mapping
);
707 unsigned int irq_create_of_mapping(struct device_node
*controller
,
708 u32
*intspec
, unsigned int intsize
)
710 struct irq_host
*host
;
711 irq_hw_number_t hwirq
;
712 unsigned int type
= IRQ_TYPE_NONE
;
715 if (controller
== NULL
)
716 host
= irq_default_host
;
718 host
= irq_find_host(controller
);
720 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
721 controller
->full_name
);
725 /* If host has no translation, then we assume interrupt line */
726 if (host
->ops
->xlate
== NULL
)
729 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
735 virq
= irq_create_mapping(host
, hwirq
);
739 /* Set type if specified and different than the current one */
740 if (type
!= IRQ_TYPE_NONE
&&
741 type
!= (get_irq_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
742 set_irq_type(virq
, type
);
745 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
747 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
751 if (of_irq_map_one(dev
, index
, &oirq
))
754 return irq_create_of_mapping(oirq
.controller
, oirq
.specifier
,
757 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
759 void irq_dispose_mapping(unsigned int virq
)
761 struct irq_host
*host
;
762 irq_hw_number_t hwirq
;
767 host
= irq_map
[virq
].host
;
768 WARN_ON (host
== NULL
);
772 /* Never unmap legacy interrupts */
773 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
776 /* remove chip and handler */
777 set_irq_chip_and_handler(virq
, NULL
, NULL
);
779 /* Make sure it's completed */
780 synchronize_irq(virq
);
782 /* Tell the PIC about it */
783 if (host
->ops
->unmap
)
784 host
->ops
->unmap(host
, virq
);
787 /* Clear reverse map */
788 hwirq
= irq_map
[virq
].hwirq
;
789 switch(host
->revmap_type
) {
790 case IRQ_HOST_MAP_LINEAR
:
791 if (hwirq
< host
->revmap_data
.linear
.size
)
792 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
794 case IRQ_HOST_MAP_TREE
:
796 * Check if radix tree allocated yet, if not then nothing to
800 if (revmap_trees_allocated
< 1)
802 mutex_lock(&revmap_trees_mutex
);
803 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
804 mutex_unlock(&revmap_trees_mutex
);
810 irq_map
[virq
].hwirq
= host
->inval_irq
;
813 get_irq_desc(virq
)->status
|= IRQ_NOREQUEST
;
816 irq_free_virt(virq
, 1);
818 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
820 unsigned int irq_find_mapping(struct irq_host
*host
,
821 irq_hw_number_t hwirq
)
824 unsigned int hint
= hwirq
% irq_virq_count
;
826 /* Look for default host if nececssary */
828 host
= irq_default_host
;
832 /* legacy -> bail early */
833 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
836 /* Slow path does a linear search of the map */
837 if (hint
< NUM_ISA_INTERRUPTS
)
838 hint
= NUM_ISA_INTERRUPTS
;
841 if (irq_map
[i
].host
== host
&&
842 irq_map
[i
].hwirq
== hwirq
)
845 if (i
>= irq_virq_count
)
846 i
= NUM_ISA_INTERRUPTS
;
850 EXPORT_SYMBOL_GPL(irq_find_mapping
);
853 unsigned int irq_radix_revmap_lookup(struct irq_host
*host
,
854 irq_hw_number_t hwirq
)
856 struct irq_map_entry
*ptr
;
859 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
862 * Check if the radix tree exists and has bee initialized.
863 * If not, we fallback to slow mode
865 if (revmap_trees_allocated
< 2)
866 return irq_find_mapping(host
, hwirq
);
868 /* Now try to resolve */
870 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
871 * as it's referencing an entry in the static irq_map table.
873 ptr
= radix_tree_lookup(&host
->revmap_data
.tree
, hwirq
);
876 * If found in radix tree, then fine.
877 * Else fallback to linear lookup - this should not happen in practice
878 * as it means that we failed to insert the node in the radix tree.
881 virq
= ptr
- irq_map
;
883 virq
= irq_find_mapping(host
, hwirq
);
888 void irq_radix_revmap_insert(struct irq_host
*host
, unsigned int virq
,
889 irq_hw_number_t hwirq
)
892 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
895 * Check if the radix tree exists yet.
896 * If not, then the irq will be inserted into the tree when it gets
900 if (revmap_trees_allocated
< 1)
903 if (virq
!= NO_IRQ
) {
904 mutex_lock(&revmap_trees_mutex
);
905 radix_tree_insert(&host
->revmap_data
.tree
, hwirq
,
907 mutex_unlock(&revmap_trees_mutex
);
911 unsigned int irq_linear_revmap(struct irq_host
*host
,
912 irq_hw_number_t hwirq
)
914 unsigned int *revmap
;
916 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
918 /* Check revmap bounds */
919 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
920 return irq_find_mapping(host
, hwirq
);
922 /* Check if revmap was allocated */
923 revmap
= host
->revmap_data
.linear
.revmap
;
924 if (unlikely(revmap
== NULL
))
925 return irq_find_mapping(host
, hwirq
);
927 /* Fill up revmap with slow path if no mapping found */
928 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
929 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
931 return revmap
[hwirq
];
934 unsigned int irq_alloc_virt(struct irq_host
*host
,
939 unsigned int i
, j
, found
= NO_IRQ
;
941 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
944 spin_lock_irqsave(&irq_big_lock
, flags
);
946 /* Use hint for 1 interrupt if any */
947 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
948 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
953 /* Look for count consecutive numbers in the allocatable
956 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
957 if (irq_map
[i
].host
!= NULL
)
963 found
= i
- count
+ 1;
967 if (found
== NO_IRQ
) {
968 spin_unlock_irqrestore(&irq_big_lock
, flags
);
972 for (i
= found
; i
< (found
+ count
); i
++) {
973 irq_map
[i
].hwirq
= host
->inval_irq
;
975 irq_map
[i
].host
= host
;
977 spin_unlock_irqrestore(&irq_big_lock
, flags
);
981 void irq_free_virt(unsigned int virq
, unsigned int count
)
986 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
987 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
989 spin_lock_irqsave(&irq_big_lock
, flags
);
990 for (i
= virq
; i
< (virq
+ count
); i
++) {
991 struct irq_host
*host
;
993 if (i
< NUM_ISA_INTERRUPTS
||
994 (virq
+ count
) > irq_virq_count
)
997 host
= irq_map
[i
].host
;
998 irq_map
[i
].hwirq
= host
->inval_irq
;
1000 irq_map
[i
].host
= NULL
;
1002 spin_unlock_irqrestore(&irq_big_lock
, flags
);
1005 void irq_early_init(void)
1009 for (i
= 0; i
< NR_IRQS
; i
++)
1010 get_irq_desc(i
)->status
|= IRQ_NOREQUEST
;
1013 /* We need to create the radix trees late */
1014 static int irq_late_init(void)
1020 * No mutual exclusion with respect to accessors of the tree is needed
1021 * here as the synchronization is done via the state variable
1022 * revmap_trees_allocated.
1024 list_for_each_entry(h
, &irq_hosts
, link
) {
1025 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
1026 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_KERNEL
);
1030 * Make sure the radix trees inits are visible before setting
1034 revmap_trees_allocated
= 1;
1037 * Insert the reverse mapping for those interrupts already present
1040 mutex_lock(&revmap_trees_mutex
);
1041 for (i
= 0; i
< irq_virq_count
; i
++) {
1042 if (irq_map
[i
].host
&&
1043 (irq_map
[i
].host
->revmap_type
== IRQ_HOST_MAP_TREE
))
1044 radix_tree_insert(&irq_map
[i
].host
->revmap_data
.tree
,
1045 irq_map
[i
].hwirq
, &irq_map
[i
]);
1047 mutex_unlock(&revmap_trees_mutex
);
1050 * Make sure the radix trees insertions are visible before setting
1054 revmap_trees_allocated
= 2;
1058 arch_initcall(irq_late_init
);
1060 #ifdef CONFIG_VIRQ_DEBUG
1061 static int virq_debug_show(struct seq_file
*m
, void *private)
1063 unsigned long flags
;
1064 struct irq_desc
*desc
;
1066 char none
[] = "none";
1069 seq_printf(m
, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1070 "chip name", "host name");
1072 for (i
= 1; i
< NR_IRQS
; i
++) {
1073 desc
= get_irq_desc(i
);
1074 spin_lock_irqsave(&desc
->lock
, flags
);
1076 if (desc
->action
&& desc
->action
->handler
) {
1077 seq_printf(m
, "%5d ", i
);
1078 seq_printf(m
, "0x%05lx ", virq_to_hw(i
));
1080 if (desc
->chip
&& desc
->chip
->typename
)
1081 p
= desc
->chip
->typename
;
1084 seq_printf(m
, "%-15s ", p
);
1086 if (irq_map
[i
].host
&& irq_map
[i
].host
->of_node
)
1087 p
= irq_map
[i
].host
->of_node
->full_name
;
1090 seq_printf(m
, "%s\n", p
);
1093 spin_unlock_irqrestore(&desc
->lock
, flags
);
1099 static int virq_debug_open(struct inode
*inode
, struct file
*file
)
1101 return single_open(file
, virq_debug_show
, inode
->i_private
);
1104 static const struct file_operations virq_debug_fops
= {
1105 .open
= virq_debug_open
,
1107 .llseek
= seq_lseek
,
1108 .release
= single_release
,
1111 static int __init
irq_debugfs_init(void)
1113 if (debugfs_create_file("virq_mapping", S_IRUGO
, powerpc_debugfs_root
,
1114 NULL
, &virq_debug_fops
) == NULL
)
1119 __initcall(irq_debugfs_init
);
1120 #endif /* CONFIG_VIRQ_DEBUG */
1123 static int __init
setup_noirqdistrib(char *str
)
1125 distribute_irqs
= 0;
1129 __setup("noirqdistrib", setup_noirqdistrib
);
1130 #endif /* CONFIG_PPC64 */