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 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t
, irq_stat
);
77 EXPORT_PER_CPU_SYMBOL(irq_stat
);
79 int __irq_offset_value
;
80 static int ppc_spurious_interrupts
;
83 EXPORT_SYMBOL(__irq_offset_value
);
84 atomic_t ppc_n_lost_interrupts
;
87 extern int tau_initialized
;
88 extern int tau_interrupts(int);
90 #endif /* CONFIG_PPC32 */
94 #ifndef CONFIG_SPARSE_IRQ
95 EXPORT_SYMBOL(irq_desc
);
98 int distribute_irqs
= 1;
100 static inline notrace
unsigned long get_hard_enabled(void)
102 unsigned long enabled
;
104 __asm__
__volatile__("lbz %0,%1(13)"
105 : "=r" (enabled
) : "i" (offsetof(struct paca_struct
, hard_enabled
)));
110 static inline notrace
void set_soft_enabled(unsigned long enable
)
112 __asm__
__volatile__("stb %0,%1(13)"
113 : : "r" (enable
), "i" (offsetof(struct paca_struct
, soft_enabled
)));
116 notrace
void raw_local_irq_restore(unsigned long en
)
119 * get_paca()->soft_enabled = en;
120 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
121 * That was allowed before, and in such a case we do need to take care
122 * that gcc will set soft_enabled directly via r13, not choose to use
123 * an intermediate register, lest we're preempted to a different cpu.
125 set_soft_enabled(en
);
129 #ifdef CONFIG_PPC_STD_MMU_64
130 if (firmware_has_feature(FW_FEATURE_ISERIES
)) {
132 * Do we need to disable preemption here? Not really: in the
133 * unlikely event that we're preempted to a different cpu in
134 * between getting r13, loading its lppaca_ptr, and loading
135 * its any_int, we might call iseries_handle_interrupts without
136 * an interrupt pending on the new cpu, but that's no disaster,
137 * is it? And the business of preempting us off the old cpu
138 * would itself involve a local_irq_restore which handles the
139 * interrupt to that cpu.
141 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
142 * to avoid any preemption checking added into get_paca().
144 if (local_paca
->lppaca_ptr
->int_dword
.any_int
)
145 iseries_handle_interrupts();
147 #endif /* CONFIG_PPC_STD_MMU_64 */
149 if (test_perf_event_pending()) {
150 clear_perf_event_pending();
151 perf_event_do_pending();
155 * if (get_paca()->hard_enabled) return;
156 * But again we need to take care that gcc gets hard_enabled directly
157 * via r13, not choose to use an intermediate register, lest we're
158 * preempted to a different cpu in between the two instructions.
160 if (get_hard_enabled())
164 * Need to hard-enable interrupts here. Since currently disabled,
165 * no need to take further asm precautions against preemption; but
166 * use local_paca instead of get_paca() to avoid preemption checking.
168 local_paca
->hard_enabled
= en
;
169 if ((int)mfspr(SPRN_DEC
) < 0)
173 * Force the delivery of pending soft-disabled interrupts on PS3.
174 * Any HV call will have this side effect.
176 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
178 lv1_get_version_info(&tmp
);
183 EXPORT_SYMBOL(raw_local_irq_restore
);
184 #endif /* CONFIG_PPC64 */
186 int show_interrupts(struct seq_file
*p
, void *v
)
188 int i
= *(loff_t
*)v
, j
;
189 struct irqaction
*action
;
190 struct irq_desc
*desc
;
195 for_each_online_cpu(j
)
196 seq_printf(p
, "CPU%d ", j
);
198 } else if (i
== nr_irqs
) {
199 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
200 if (tau_initialized
){
201 seq_puts(p
, "TAU: ");
202 for_each_online_cpu(j
)
203 seq_printf(p
, "%10u ", tau_interrupts(j
));
204 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
206 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT*/
207 seq_printf(p
, "BAD: %10u\n", ppc_spurious_interrupts
);
212 desc
= irq_to_desc(i
);
216 raw_spin_lock_irqsave(&desc
->lock
, flags
);
218 action
= desc
->action
;
219 if (!action
|| !action
->handler
)
222 seq_printf(p
, "%3d: ", i
);
224 for_each_online_cpu(j
)
225 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
227 seq_printf(p
, "%10u ", kstat_irqs(i
));
228 #endif /* CONFIG_SMP */
231 seq_printf(p
, " %s ", desc
->chip
->name
);
233 seq_puts(p
, " None ");
235 seq_printf(p
, "%s", (desc
->status
& IRQ_LEVEL
) ? "Level " : "Edge ");
236 seq_printf(p
, " %s", action
->name
);
238 for (action
= action
->next
; action
; action
= action
->next
)
239 seq_printf(p
, ", %s", action
->name
);
243 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
248 #ifdef CONFIG_HOTPLUG_CPU
249 void fixup_irqs(cpumask_t map
)
251 struct irq_desc
*desc
;
258 desc
= irq_to_desc(irq
);
259 if (desc
&& desc
->status
& IRQ_PER_CPU
)
262 cpumask_and(&mask
, desc
->affinity
, &map
);
263 if (any_online_cpu(mask
) == NR_CPUS
) {
264 printk("Breaking affinity for irq %i\n", irq
);
267 if (desc
->chip
->set_affinity
)
268 desc
->chip
->set_affinity(irq
, &mask
);
269 else if (desc
->action
&& !(warned
++))
270 printk("Cannot set affinity for irq %i\n", irq
);
279 #ifdef CONFIG_IRQSTACKS
280 static inline void handle_one_irq(unsigned int irq
)
282 struct thread_info
*curtp
, *irqtp
;
283 unsigned long saved_sp_limit
;
284 struct irq_desc
*desc
;
286 /* Switch to the irq stack to handle this */
287 curtp
= current_thread_info();
288 irqtp
= hardirq_ctx
[smp_processor_id()];
290 if (curtp
== irqtp
) {
291 /* We're already on the irq stack, just handle it */
292 generic_handle_irq(irq
);
296 desc
= irq_to_desc(irq
);
297 saved_sp_limit
= current
->thread
.ksp_limit
;
299 irqtp
->task
= curtp
->task
;
302 /* Copy the softirq bits in preempt_count so that the
303 * softirq checks work in the hardirq context. */
304 irqtp
->preempt_count
= (irqtp
->preempt_count
& ~SOFTIRQ_MASK
) |
305 (curtp
->preempt_count
& SOFTIRQ_MASK
);
307 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
308 _ALIGN_UP(sizeof(struct thread_info
), 16);
310 call_handle_irq(irq
, desc
, irqtp
, desc
->handle_irq
);
311 current
->thread
.ksp_limit
= saved_sp_limit
;
314 /* Set any flag that may have been set on the
318 set_bits(irqtp
->flags
, &curtp
->flags
);
321 static inline void handle_one_irq(unsigned int irq
)
323 generic_handle_irq(irq
);
327 static inline void check_stack_overflow(void)
329 #ifdef CONFIG_DEBUG_STACKOVERFLOW
332 sp
= __get_SP() & (THREAD_SIZE
-1);
334 /* check for stack overflow: is there less than 2KB free? */
335 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
336 printk("do_IRQ: stack overflow: %ld\n",
337 sp
- sizeof(struct thread_info
));
343 void do_IRQ(struct pt_regs
*regs
)
345 struct pt_regs
*old_regs
= set_irq_regs(regs
);
348 trace_irq_entry(regs
);
352 check_stack_overflow();
354 irq
= ppc_md
.get_irq();
356 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
)
358 else if (irq
!= NO_IRQ_IGNORE
)
359 /* That's not SMP safe ... but who cares ? */
360 ppc_spurious_interrupts
++;
363 set_irq_regs(old_regs
);
365 #ifdef CONFIG_PPC_ISERIES
366 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
367 get_lppaca()->int_dword
.fields
.decr_int
) {
368 get_lppaca()->int_dword
.fields
.decr_int
= 0;
369 /* Signal a fake decrementer interrupt */
370 timer_interrupt(regs
);
374 trace_irq_exit(regs
);
377 void __init
init_IRQ(void)
387 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
388 struct thread_info
*critirq_ctx
[NR_CPUS
] __read_mostly
;
389 struct thread_info
*dbgirq_ctx
[NR_CPUS
] __read_mostly
;
390 struct thread_info
*mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
392 void exc_lvl_ctx_init(void)
394 struct thread_info
*tp
;
397 for_each_possible_cpu(i
) {
398 memset((void *)critirq_ctx
[i
], 0, THREAD_SIZE
);
401 tp
->preempt_count
= 0;
404 memset((void *)dbgirq_ctx
[i
], 0, THREAD_SIZE
);
407 tp
->preempt_count
= 0;
409 memset((void *)mcheckirq_ctx
[i
], 0, THREAD_SIZE
);
410 tp
= mcheckirq_ctx
[i
];
412 tp
->preempt_count
= HARDIRQ_OFFSET
;
418 #ifdef CONFIG_IRQSTACKS
419 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
420 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
422 void irq_ctx_init(void)
424 struct thread_info
*tp
;
427 for_each_possible_cpu(i
) {
428 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
431 tp
->preempt_count
= 0;
433 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
436 tp
->preempt_count
= HARDIRQ_OFFSET
;
440 static inline void do_softirq_onstack(void)
442 struct thread_info
*curtp
, *irqtp
;
443 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
445 curtp
= current_thread_info();
446 irqtp
= softirq_ctx
[smp_processor_id()];
447 irqtp
->task
= curtp
->task
;
448 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
449 _ALIGN_UP(sizeof(struct thread_info
), 16);
450 call_do_softirq(irqtp
);
451 current
->thread
.ksp_limit
= saved_sp_limit
;
456 #define do_softirq_onstack() __do_softirq()
457 #endif /* CONFIG_IRQSTACKS */
459 void do_softirq(void)
466 local_irq_save(flags
);
468 if (local_softirq_pending())
469 do_softirq_onstack();
471 local_irq_restore(flags
);
476 * IRQ controller and virtual interrupts
479 static LIST_HEAD(irq_hosts
);
480 static DEFINE_SPINLOCK(irq_big_lock
);
481 static unsigned int revmap_trees_allocated
;
482 static DEFINE_MUTEX(revmap_trees_mutex
);
483 struct irq_map_entry irq_map
[NR_IRQS
];
484 static unsigned int irq_virq_count
= NR_IRQS
;
485 static struct irq_host
*irq_default_host
;
487 irq_hw_number_t
virq_to_hw(unsigned int virq
)
489 return irq_map
[virq
].hwirq
;
491 EXPORT_SYMBOL_GPL(virq_to_hw
);
493 static int default_irq_host_match(struct irq_host
*h
, struct device_node
*np
)
495 return h
->of_node
!= NULL
&& h
->of_node
== np
;
498 struct irq_host
*irq_alloc_host(struct device_node
*of_node
,
499 unsigned int revmap_type
,
500 unsigned int revmap_arg
,
501 struct irq_host_ops
*ops
,
502 irq_hw_number_t inval_irq
)
504 struct irq_host
*host
;
505 unsigned int size
= sizeof(struct irq_host
);
510 /* Allocate structure and revmap table if using linear mapping */
511 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
512 size
+= revmap_arg
* sizeof(unsigned int);
513 host
= zalloc_maybe_bootmem(size
, GFP_KERNEL
);
518 host
->revmap_type
= revmap_type
;
519 host
->inval_irq
= inval_irq
;
521 host
->of_node
= of_node_get(of_node
);
523 if (host
->ops
->match
== NULL
)
524 host
->ops
->match
= default_irq_host_match
;
526 spin_lock_irqsave(&irq_big_lock
, flags
);
528 /* If it's a legacy controller, check for duplicates and
529 * mark it as allocated (we use irq 0 host pointer for that
531 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
532 if (irq_map
[0].host
!= NULL
) {
533 spin_unlock_irqrestore(&irq_big_lock
, flags
);
534 /* If we are early boot, we can't free the structure,
536 * this will be fixed once slab is made available early
537 * instead of the current cruft
543 irq_map
[0].host
= host
;
546 list_add(&host
->link
, &irq_hosts
);
547 spin_unlock_irqrestore(&irq_big_lock
, flags
);
549 /* Additional setups per revmap type */
550 switch(revmap_type
) {
551 case IRQ_HOST_MAP_LEGACY
:
552 /* 0 is always the invalid number for legacy */
554 /* setup us as the host for all legacy interrupts */
555 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
556 irq_map
[i
].hwirq
= i
;
558 irq_map
[i
].host
= host
;
561 /* Clear norequest flags */
562 irq_to_desc(i
)->status
&= ~IRQ_NOREQUEST
;
564 /* Legacy flags are left to default at this point,
565 * one can then use irq_create_mapping() to
566 * explicitly change them
568 ops
->map(host
, i
, i
);
571 case IRQ_HOST_MAP_LINEAR
:
572 rmap
= (unsigned int *)(host
+ 1);
573 for (i
= 0; i
< revmap_arg
; i
++)
575 host
->revmap_data
.linear
.size
= revmap_arg
;
577 host
->revmap_data
.linear
.revmap
= rmap
;
583 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
588 struct irq_host
*irq_find_host(struct device_node
*node
)
590 struct irq_host
*h
, *found
= NULL
;
593 /* We might want to match the legacy controller last since
594 * it might potentially be set to match all interrupts in
595 * the absence of a device node. This isn't a problem so far
598 spin_lock_irqsave(&irq_big_lock
, flags
);
599 list_for_each_entry(h
, &irq_hosts
, link
)
600 if (h
->ops
->match(h
, node
)) {
604 spin_unlock_irqrestore(&irq_big_lock
, flags
);
607 EXPORT_SYMBOL_GPL(irq_find_host
);
609 void irq_set_default_host(struct irq_host
*host
)
611 pr_debug("irq: Default host set to @0x%p\n", host
);
613 irq_default_host
= host
;
616 void irq_set_virq_count(unsigned int count
)
618 pr_debug("irq: Trying to set virq count to %d\n", count
);
620 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
622 irq_virq_count
= count
;
625 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
626 irq_hw_number_t hwirq
)
628 struct irq_desc
*desc
;
630 desc
= irq_to_desc_alloc_node(virq
, 0);
632 pr_debug("irq: -> allocating desc failed\n");
636 /* Clear IRQ_NOREQUEST flag */
637 desc
->status
&= ~IRQ_NOREQUEST
;
641 irq_map
[virq
].hwirq
= hwirq
;
644 if (host
->ops
->map(host
, virq
, hwirq
)) {
645 pr_debug("irq: -> mapping failed, freeing\n");
652 irq_free_virt(virq
, 1);
656 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
661 host
= irq_default_host
;
663 BUG_ON(host
== NULL
);
664 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
666 virq
= irq_alloc_virt(host
, 1, 0);
667 if (virq
== NO_IRQ
) {
668 pr_debug("irq: create_direct virq allocation failed\n");
672 pr_debug("irq: create_direct obtained virq %d\n", virq
);
674 if (irq_setup_virq(host
, virq
, virq
))
680 unsigned int irq_create_mapping(struct irq_host
*host
,
681 irq_hw_number_t hwirq
)
683 unsigned int virq
, hint
;
685 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
687 /* Look for default host if nececssary */
689 host
= irq_default_host
;
691 printk(KERN_WARNING
"irq_create_mapping called for"
692 " NULL host, hwirq=%lx\n", hwirq
);
696 pr_debug("irq: -> using host @%p\n", host
);
698 /* Check if mapping already exist, if it does, call
699 * host->ops->map() to update the flags
701 virq
= irq_find_mapping(host
, hwirq
);
702 if (virq
!= NO_IRQ
) {
703 if (host
->ops
->remap
)
704 host
->ops
->remap(host
, virq
, hwirq
);
705 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
709 /* Get a virtual interrupt number */
710 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
712 virq
= (unsigned int)hwirq
;
713 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
717 /* Allocate a virtual interrupt number */
718 hint
= hwirq
% irq_virq_count
;
719 virq
= irq_alloc_virt(host
, 1, hint
);
720 if (virq
== NO_IRQ
) {
721 pr_debug("irq: -> virq allocation failed\n");
726 if (irq_setup_virq(host
, virq
, hwirq
))
729 printk(KERN_DEBUG
"irq: irq %lu on host %s mapped to virtual irq %u\n",
730 hwirq
, host
->of_node
? host
->of_node
->full_name
: "null", virq
);
734 EXPORT_SYMBOL_GPL(irq_create_mapping
);
736 unsigned int irq_create_of_mapping(struct device_node
*controller
,
737 const u32
*intspec
, unsigned int intsize
)
739 struct irq_host
*host
;
740 irq_hw_number_t hwirq
;
741 unsigned int type
= IRQ_TYPE_NONE
;
744 if (controller
== NULL
)
745 host
= irq_default_host
;
747 host
= irq_find_host(controller
);
749 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
750 controller
->full_name
);
754 /* If host has no translation, then we assume interrupt line */
755 if (host
->ops
->xlate
== NULL
)
758 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
764 virq
= irq_create_mapping(host
, hwirq
);
768 /* Set type if specified and different than the current one */
769 if (type
!= IRQ_TYPE_NONE
&&
770 type
!= (irq_to_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
771 set_irq_type(virq
, type
);
774 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
776 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
780 if (of_irq_map_one(dev
, index
, &oirq
))
783 return irq_create_of_mapping(oirq
.controller
, oirq
.specifier
,
786 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
788 void irq_dispose_mapping(unsigned int virq
)
790 struct irq_host
*host
;
791 irq_hw_number_t hwirq
;
796 host
= irq_map
[virq
].host
;
797 WARN_ON (host
== NULL
);
801 /* Never unmap legacy interrupts */
802 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
805 /* remove chip and handler */
806 set_irq_chip_and_handler(virq
, NULL
, NULL
);
808 /* Make sure it's completed */
809 synchronize_irq(virq
);
811 /* Tell the PIC about it */
812 if (host
->ops
->unmap
)
813 host
->ops
->unmap(host
, virq
);
816 /* Clear reverse map */
817 hwirq
= irq_map
[virq
].hwirq
;
818 switch(host
->revmap_type
) {
819 case IRQ_HOST_MAP_LINEAR
:
820 if (hwirq
< host
->revmap_data
.linear
.size
)
821 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
823 case IRQ_HOST_MAP_TREE
:
825 * Check if radix tree allocated yet, if not then nothing to
829 if (revmap_trees_allocated
< 1)
831 mutex_lock(&revmap_trees_mutex
);
832 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
833 mutex_unlock(&revmap_trees_mutex
);
839 irq_map
[virq
].hwirq
= host
->inval_irq
;
842 irq_to_desc(virq
)->status
|= IRQ_NOREQUEST
;
845 irq_free_virt(virq
, 1);
847 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
849 unsigned int irq_find_mapping(struct irq_host
*host
,
850 irq_hw_number_t hwirq
)
853 unsigned int hint
= hwirq
% irq_virq_count
;
855 /* Look for default host if nececssary */
857 host
= irq_default_host
;
861 /* legacy -> bail early */
862 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
865 /* Slow path does a linear search of the map */
866 if (hint
< NUM_ISA_INTERRUPTS
)
867 hint
= NUM_ISA_INTERRUPTS
;
870 if (irq_map
[i
].host
== host
&&
871 irq_map
[i
].hwirq
== hwirq
)
874 if (i
>= irq_virq_count
)
875 i
= NUM_ISA_INTERRUPTS
;
879 EXPORT_SYMBOL_GPL(irq_find_mapping
);
882 unsigned int irq_radix_revmap_lookup(struct irq_host
*host
,
883 irq_hw_number_t hwirq
)
885 struct irq_map_entry
*ptr
;
888 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
891 * Check if the radix tree exists and has bee initialized.
892 * If not, we fallback to slow mode
894 if (revmap_trees_allocated
< 2)
895 return irq_find_mapping(host
, hwirq
);
897 /* Now try to resolve */
899 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
900 * as it's referencing an entry in the static irq_map table.
902 ptr
= radix_tree_lookup(&host
->revmap_data
.tree
, hwirq
);
905 * If found in radix tree, then fine.
906 * Else fallback to linear lookup - this should not happen in practice
907 * as it means that we failed to insert the node in the radix tree.
910 virq
= ptr
- irq_map
;
912 virq
= irq_find_mapping(host
, hwirq
);
917 void irq_radix_revmap_insert(struct irq_host
*host
, unsigned int virq
,
918 irq_hw_number_t hwirq
)
921 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
924 * Check if the radix tree exists yet.
925 * If not, then the irq will be inserted into the tree when it gets
929 if (revmap_trees_allocated
< 1)
932 if (virq
!= NO_IRQ
) {
933 mutex_lock(&revmap_trees_mutex
);
934 radix_tree_insert(&host
->revmap_data
.tree
, hwirq
,
936 mutex_unlock(&revmap_trees_mutex
);
940 unsigned int irq_linear_revmap(struct irq_host
*host
,
941 irq_hw_number_t hwirq
)
943 unsigned int *revmap
;
945 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
947 /* Check revmap bounds */
948 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
949 return irq_find_mapping(host
, hwirq
);
951 /* Check if revmap was allocated */
952 revmap
= host
->revmap_data
.linear
.revmap
;
953 if (unlikely(revmap
== NULL
))
954 return irq_find_mapping(host
, hwirq
);
956 /* Fill up revmap with slow path if no mapping found */
957 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
958 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
960 return revmap
[hwirq
];
963 unsigned int irq_alloc_virt(struct irq_host
*host
,
968 unsigned int i
, j
, found
= NO_IRQ
;
970 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
973 spin_lock_irqsave(&irq_big_lock
, flags
);
975 /* Use hint for 1 interrupt if any */
976 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
977 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
982 /* Look for count consecutive numbers in the allocatable
985 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
986 if (irq_map
[i
].host
!= NULL
)
992 found
= i
- count
+ 1;
996 if (found
== NO_IRQ
) {
997 spin_unlock_irqrestore(&irq_big_lock
, flags
);
1001 for (i
= found
; i
< (found
+ count
); i
++) {
1002 irq_map
[i
].hwirq
= host
->inval_irq
;
1004 irq_map
[i
].host
= host
;
1006 spin_unlock_irqrestore(&irq_big_lock
, flags
);
1010 void irq_free_virt(unsigned int virq
, unsigned int count
)
1012 unsigned long flags
;
1015 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
1016 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
1018 spin_lock_irqsave(&irq_big_lock
, flags
);
1019 for (i
= virq
; i
< (virq
+ count
); i
++) {
1020 struct irq_host
*host
;
1022 if (i
< NUM_ISA_INTERRUPTS
||
1023 (virq
+ count
) > irq_virq_count
)
1026 host
= irq_map
[i
].host
;
1027 irq_map
[i
].hwirq
= host
->inval_irq
;
1029 irq_map
[i
].host
= NULL
;
1031 spin_unlock_irqrestore(&irq_big_lock
, flags
);
1034 int arch_early_irq_init(void)
1036 struct irq_desc
*desc
;
1039 for (i
= 0; i
< NR_IRQS
; i
++) {
1040 desc
= irq_to_desc(i
);
1042 desc
->status
|= IRQ_NOREQUEST
;
1048 int arch_init_chip_data(struct irq_desc
*desc
, int node
)
1050 desc
->status
|= IRQ_NOREQUEST
;
1054 /* We need to create the radix trees late */
1055 static int irq_late_init(void)
1061 * No mutual exclusion with respect to accessors of the tree is needed
1062 * here as the synchronization is done via the state variable
1063 * revmap_trees_allocated.
1065 list_for_each_entry(h
, &irq_hosts
, link
) {
1066 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
1067 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_KERNEL
);
1071 * Make sure the radix trees inits are visible before setting
1075 revmap_trees_allocated
= 1;
1078 * Insert the reverse mapping for those interrupts already present
1081 mutex_lock(&revmap_trees_mutex
);
1082 for (i
= 0; i
< irq_virq_count
; i
++) {
1083 if (irq_map
[i
].host
&&
1084 (irq_map
[i
].host
->revmap_type
== IRQ_HOST_MAP_TREE
))
1085 radix_tree_insert(&irq_map
[i
].host
->revmap_data
.tree
,
1086 irq_map
[i
].hwirq
, &irq_map
[i
]);
1088 mutex_unlock(&revmap_trees_mutex
);
1091 * Make sure the radix trees insertions are visible before setting
1095 revmap_trees_allocated
= 2;
1099 arch_initcall(irq_late_init
);
1101 #ifdef CONFIG_VIRQ_DEBUG
1102 static int virq_debug_show(struct seq_file
*m
, void *private)
1104 unsigned long flags
;
1105 struct irq_desc
*desc
;
1107 char none
[] = "none";
1110 seq_printf(m
, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1111 "chip name", "host name");
1113 for (i
= 1; i
< nr_irqs
; i
++) {
1114 desc
= irq_to_desc(i
);
1118 raw_spin_lock_irqsave(&desc
->lock
, flags
);
1120 if (desc
->action
&& desc
->action
->handler
) {
1121 seq_printf(m
, "%5d ", i
);
1122 seq_printf(m
, "0x%05lx ", virq_to_hw(i
));
1124 if (desc
->chip
&& desc
->chip
->name
)
1125 p
= desc
->chip
->name
;
1128 seq_printf(m
, "%-15s ", p
);
1130 if (irq_map
[i
].host
&& irq_map
[i
].host
->of_node
)
1131 p
= irq_map
[i
].host
->of_node
->full_name
;
1134 seq_printf(m
, "%s\n", p
);
1137 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
1143 static int virq_debug_open(struct inode
*inode
, struct file
*file
)
1145 return single_open(file
, virq_debug_show
, inode
->i_private
);
1148 static const struct file_operations virq_debug_fops
= {
1149 .open
= virq_debug_open
,
1151 .llseek
= seq_lseek
,
1152 .release
= single_release
,
1155 static int __init
irq_debugfs_init(void)
1157 if (debugfs_create_file("virq_mapping", S_IRUGO
, powerpc_debugfs_root
,
1158 NULL
, &virq_debug_fops
) == NULL
)
1163 __initcall(irq_debugfs_init
);
1164 #endif /* CONFIG_VIRQ_DEBUG */
1167 static int __init
setup_noirqdistrib(char *str
)
1169 distribute_irqs
= 0;
1173 __setup("noirqdistrib", setup_noirqdistrib
);
1174 #endif /* CONFIG_PPC64 */