2 * Derived from arch/i386/kernel/irq.c
3 * Copyright (C) 1992 Linus Torvalds
4 * Adapted from arch/i386 by Gary Thomas
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Updated and modified by Cort Dougan <cort@fsmlabs.com>
7 * Copyright (C) 1996-2001 Cort Dougan
8 * Adapted for Power Macintosh by Paul Mackerras
9 * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
16 * This file contains the code used by various IRQ handling routines:
17 * asking for different IRQ's should be done through these routines
18 * instead of just grabbing them. Thus setups with different IRQ numbers
19 * shouldn't result in any weird surprises, and installing new handlers
22 * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the
23 * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit
24 * mask register (of which only 16 are defined), hence the weird shifting
25 * and complement of the cached_irq_mask. I want to be able to stuff
26 * this right into the SIU SMASK register.
27 * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
28 * to reduce code space and undefined function references.
33 #include <linux/module.h>
34 #include <linux/threads.h>
35 #include <linux/kernel_stat.h>
36 #include <linux/signal.h>
37 #include <linux/sched.h>
38 #include <linux/ptrace.h>
39 #include <linux/ioport.h>
40 #include <linux/interrupt.h>
41 #include <linux/timex.h>
42 #include <linux/init.h>
43 #include <linux/slab.h>
44 #include <linux/delay.h>
45 #include <linux/irq.h>
46 #include <linux/seq_file.h>
47 #include <linux/cpumask.h>
48 #include <linux/profile.h>
49 #include <linux/bitops.h>
50 #include <linux/list.h>
51 #include <linux/radix-tree.h>
52 #include <linux/mutex.h>
53 #include <linux/bootmem.h>
54 #include <linux/pci.h>
55 #include <linux/debugfs.h>
57 #include <linux/of_irq.h>
59 #include <asm/uaccess.h>
60 #include <asm/system.h>
62 #include <asm/pgtable.h>
64 #include <asm/cache.h>
66 #include <asm/ptrace.h>
67 #include <asm/machdep.h>
71 #include <asm/firmware.h>
72 #include <asm/lv1call.h>
74 #define CREATE_TRACE_POINTS
75 #include <asm/trace.h>
77 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t
, irq_stat
);
78 EXPORT_PER_CPU_SYMBOL(irq_stat
);
80 int __irq_offset_value
;
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 */
150 * if (get_paca()->hard_enabled) return;
151 * But again we need to take care that gcc gets hard_enabled directly
152 * via r13, not choose to use an intermediate register, lest we're
153 * preempted to a different cpu in between the two instructions.
155 if (get_hard_enabled())
159 * Need to hard-enable interrupts here. Since currently disabled,
160 * no need to take further asm precautions against preemption; but
161 * use local_paca instead of get_paca() to avoid preemption checking.
163 local_paca
->hard_enabled
= en
;
164 if ((int)mfspr(SPRN_DEC
) < 0)
168 * Force the delivery of pending soft-disabled interrupts on PS3.
169 * Any HV call will have this side effect.
171 if (firmware_has_feature(FW_FEATURE_PS3_LV1
)) {
173 lv1_get_version_info(&tmp
);
178 EXPORT_SYMBOL(raw_local_irq_restore
);
179 #endif /* CONFIG_PPC64 */
181 static int show_other_interrupts(struct seq_file
*p
, int prec
)
185 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
186 if (tau_initialized
) {
187 seq_printf(p
, "%*s: ", prec
, "TAU");
188 for_each_online_cpu(j
)
189 seq_printf(p
, "%10u ", tau_interrupts(j
));
190 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
192 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
194 seq_printf(p
, "%*s: ", prec
, "LOC");
195 for_each_online_cpu(j
)
196 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).timer_irqs
);
197 seq_printf(p
, " Local timer interrupts\n");
199 seq_printf(p
, "%*s: ", prec
, "SPU");
200 for_each_online_cpu(j
)
201 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).spurious_irqs
);
202 seq_printf(p
, " Spurious interrupts\n");
204 seq_printf(p
, "%*s: ", prec
, "CNT");
205 for_each_online_cpu(j
)
206 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).pmu_irqs
);
207 seq_printf(p
, " Performance monitoring interrupts\n");
209 seq_printf(p
, "%*s: ", prec
, "MCE");
210 for_each_online_cpu(j
)
211 seq_printf(p
, "%10u ", per_cpu(irq_stat
, j
).mce_exceptions
);
212 seq_printf(p
, " Machine check exceptions\n");
217 int show_interrupts(struct seq_file
*p
, void *v
)
219 unsigned long flags
, any_count
= 0;
220 int i
= *(loff_t
*) v
, j
, prec
;
221 struct irqaction
*action
;
222 struct irq_desc
*desc
;
227 for (prec
= 3, j
= 1000; prec
< 10 && j
<= nr_irqs
; ++prec
)
231 return show_other_interrupts(p
, prec
);
235 seq_printf(p
, "%*s", prec
+ 8, "");
236 for_each_online_cpu(j
)
237 seq_printf(p
, "CPU%-8d", j
);
241 desc
= irq_to_desc(i
);
245 raw_spin_lock_irqsave(&desc
->lock
, flags
);
246 for_each_online_cpu(j
)
247 any_count
|= kstat_irqs_cpu(i
, j
);
248 action
= desc
->action
;
249 if (!action
&& !any_count
)
252 seq_printf(p
, "%*d: ", prec
, i
);
253 for_each_online_cpu(j
)
254 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
257 seq_printf(p
, " %-16s", desc
->chip
->name
);
259 seq_printf(p
, " %-16s", "None");
260 seq_printf(p
, " %-8s", (desc
->status
& IRQ_LEVEL
) ? "Level" : "Edge");
263 seq_printf(p
, " %s", action
->name
);
264 while ((action
= action
->next
) != NULL
)
265 seq_printf(p
, ", %s", action
->name
);
270 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
277 u64
arch_irq_stat_cpu(unsigned int cpu
)
279 u64 sum
= per_cpu(irq_stat
, cpu
).timer_irqs
;
281 sum
+= per_cpu(irq_stat
, cpu
).pmu_irqs
;
282 sum
+= per_cpu(irq_stat
, cpu
).mce_exceptions
;
283 sum
+= per_cpu(irq_stat
, cpu
).spurious_irqs
;
288 #ifdef CONFIG_HOTPLUG_CPU
289 void fixup_irqs(const struct cpumask
*map
)
291 struct irq_desc
*desc
;
296 alloc_cpumask_var(&mask
, GFP_KERNEL
);
299 desc
= irq_to_desc(irq
);
300 if (desc
&& desc
->status
& IRQ_PER_CPU
)
303 cpumask_and(mask
, desc
->affinity
, map
);
304 if (cpumask_any(mask
) >= nr_cpu_ids
) {
305 printk("Breaking affinity for irq %i\n", irq
);
306 cpumask_copy(mask
, map
);
308 if (desc
->chip
->set_affinity
)
309 desc
->chip
->set_affinity(irq
, mask
);
310 else if (desc
->action
&& !(warned
++))
311 printk("Cannot set affinity for irq %i\n", irq
);
314 free_cpumask_var(mask
);
322 #ifdef CONFIG_IRQSTACKS
323 static inline void handle_one_irq(unsigned int irq
)
325 struct thread_info
*curtp
, *irqtp
;
326 unsigned long saved_sp_limit
;
327 struct irq_desc
*desc
;
329 /* Switch to the irq stack to handle this */
330 curtp
= current_thread_info();
331 irqtp
= hardirq_ctx
[smp_processor_id()];
333 if (curtp
== irqtp
) {
334 /* We're already on the irq stack, just handle it */
335 generic_handle_irq(irq
);
339 desc
= irq_to_desc(irq
);
340 saved_sp_limit
= current
->thread
.ksp_limit
;
342 irqtp
->task
= curtp
->task
;
345 /* Copy the softirq bits in preempt_count so that the
346 * softirq checks work in the hardirq context. */
347 irqtp
->preempt_count
= (irqtp
->preempt_count
& ~SOFTIRQ_MASK
) |
348 (curtp
->preempt_count
& SOFTIRQ_MASK
);
350 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
351 _ALIGN_UP(sizeof(struct thread_info
), 16);
353 call_handle_irq(irq
, desc
, irqtp
, desc
->handle_irq
);
354 current
->thread
.ksp_limit
= saved_sp_limit
;
357 /* Set any flag that may have been set on the
361 set_bits(irqtp
->flags
, &curtp
->flags
);
364 static inline void handle_one_irq(unsigned int irq
)
366 generic_handle_irq(irq
);
370 static inline void check_stack_overflow(void)
372 #ifdef CONFIG_DEBUG_STACKOVERFLOW
375 sp
= __get_SP() & (THREAD_SIZE
-1);
377 /* check for stack overflow: is there less than 2KB free? */
378 if (unlikely(sp
< (sizeof(struct thread_info
) + 2048))) {
379 printk("do_IRQ: stack overflow: %ld\n",
380 sp
- sizeof(struct thread_info
));
386 void do_IRQ(struct pt_regs
*regs
)
388 struct pt_regs
*old_regs
= set_irq_regs(regs
);
391 trace_irq_entry(regs
);
395 check_stack_overflow();
397 irq
= ppc_md
.get_irq();
399 if (irq
!= NO_IRQ
&& irq
!= NO_IRQ_IGNORE
)
401 else if (irq
!= NO_IRQ_IGNORE
)
402 __get_cpu_var(irq_stat
).spurious_irqs
++;
405 set_irq_regs(old_regs
);
407 #ifdef CONFIG_PPC_ISERIES
408 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
409 get_lppaca()->int_dword
.fields
.decr_int
) {
410 get_lppaca()->int_dword
.fields
.decr_int
= 0;
411 /* Signal a fake decrementer interrupt */
412 timer_interrupt(regs
);
416 trace_irq_exit(regs
);
419 void __init
init_IRQ(void)
429 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
430 struct thread_info
*critirq_ctx
[NR_CPUS
] __read_mostly
;
431 struct thread_info
*dbgirq_ctx
[NR_CPUS
] __read_mostly
;
432 struct thread_info
*mcheckirq_ctx
[NR_CPUS
] __read_mostly
;
434 void exc_lvl_ctx_init(void)
436 struct thread_info
*tp
;
439 for_each_possible_cpu(i
) {
440 memset((void *)critirq_ctx
[i
], 0, THREAD_SIZE
);
443 tp
->preempt_count
= 0;
446 memset((void *)dbgirq_ctx
[i
], 0, THREAD_SIZE
);
449 tp
->preempt_count
= 0;
451 memset((void *)mcheckirq_ctx
[i
], 0, THREAD_SIZE
);
452 tp
= mcheckirq_ctx
[i
];
454 tp
->preempt_count
= HARDIRQ_OFFSET
;
460 #ifdef CONFIG_IRQSTACKS
461 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
462 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
464 void irq_ctx_init(void)
466 struct thread_info
*tp
;
469 for_each_possible_cpu(i
) {
470 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
473 tp
->preempt_count
= 0;
475 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
478 tp
->preempt_count
= HARDIRQ_OFFSET
;
482 static inline void do_softirq_onstack(void)
484 struct thread_info
*curtp
, *irqtp
;
485 unsigned long saved_sp_limit
= current
->thread
.ksp_limit
;
487 curtp
= current_thread_info();
488 irqtp
= softirq_ctx
[smp_processor_id()];
489 irqtp
->task
= curtp
->task
;
490 current
->thread
.ksp_limit
= (unsigned long)irqtp
+
491 _ALIGN_UP(sizeof(struct thread_info
), 16);
492 call_do_softirq(irqtp
);
493 current
->thread
.ksp_limit
= saved_sp_limit
;
498 #define do_softirq_onstack() __do_softirq()
499 #endif /* CONFIG_IRQSTACKS */
501 void do_softirq(void)
508 local_irq_save(flags
);
510 if (local_softirq_pending())
511 do_softirq_onstack();
513 local_irq_restore(flags
);
518 * IRQ controller and virtual interrupts
521 static LIST_HEAD(irq_hosts
);
522 static DEFINE_RAW_SPINLOCK(irq_big_lock
);
523 static unsigned int revmap_trees_allocated
;
524 static DEFINE_MUTEX(revmap_trees_mutex
);
525 struct irq_map_entry irq_map
[NR_IRQS
];
526 static unsigned int irq_virq_count
= NR_IRQS
;
527 static struct irq_host
*irq_default_host
;
529 irq_hw_number_t
virq_to_hw(unsigned int virq
)
531 return irq_map
[virq
].hwirq
;
533 EXPORT_SYMBOL_GPL(virq_to_hw
);
535 static int default_irq_host_match(struct irq_host
*h
, struct device_node
*np
)
537 return h
->of_node
!= NULL
&& h
->of_node
== np
;
540 struct irq_host
*irq_alloc_host(struct device_node
*of_node
,
541 unsigned int revmap_type
,
542 unsigned int revmap_arg
,
543 struct irq_host_ops
*ops
,
544 irq_hw_number_t inval_irq
)
546 struct irq_host
*host
;
547 unsigned int size
= sizeof(struct irq_host
);
552 /* Allocate structure and revmap table if using linear mapping */
553 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
554 size
+= revmap_arg
* sizeof(unsigned int);
555 host
= zalloc_maybe_bootmem(size
, GFP_KERNEL
);
560 host
->revmap_type
= revmap_type
;
561 host
->inval_irq
= inval_irq
;
563 host
->of_node
= of_node_get(of_node
);
565 if (host
->ops
->match
== NULL
)
566 host
->ops
->match
= default_irq_host_match
;
568 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
570 /* If it's a legacy controller, check for duplicates and
571 * mark it as allocated (we use irq 0 host pointer for that
573 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
574 if (irq_map
[0].host
!= NULL
) {
575 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
576 /* If we are early boot, we can't free the structure,
578 * this will be fixed once slab is made available early
579 * instead of the current cruft
585 irq_map
[0].host
= host
;
588 list_add(&host
->link
, &irq_hosts
);
589 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
591 /* Additional setups per revmap type */
592 switch(revmap_type
) {
593 case IRQ_HOST_MAP_LEGACY
:
594 /* 0 is always the invalid number for legacy */
596 /* setup us as the host for all legacy interrupts */
597 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
598 irq_map
[i
].hwirq
= i
;
600 irq_map
[i
].host
= host
;
603 /* Clear norequest flags */
604 irq_to_desc(i
)->status
&= ~IRQ_NOREQUEST
;
606 /* Legacy flags are left to default at this point,
607 * one can then use irq_create_mapping() to
608 * explicitly change them
610 ops
->map(host
, i
, i
);
613 case IRQ_HOST_MAP_LINEAR
:
614 rmap
= (unsigned int *)(host
+ 1);
615 for (i
= 0; i
< revmap_arg
; i
++)
617 host
->revmap_data
.linear
.size
= revmap_arg
;
619 host
->revmap_data
.linear
.revmap
= rmap
;
625 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
630 struct irq_host
*irq_find_host(struct device_node
*node
)
632 struct irq_host
*h
, *found
= NULL
;
635 /* We might want to match the legacy controller last since
636 * it might potentially be set to match all interrupts in
637 * the absence of a device node. This isn't a problem so far
640 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
641 list_for_each_entry(h
, &irq_hosts
, link
)
642 if (h
->ops
->match(h
, node
)) {
646 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
649 EXPORT_SYMBOL_GPL(irq_find_host
);
651 void irq_set_default_host(struct irq_host
*host
)
653 pr_debug("irq: Default host set to @0x%p\n", host
);
655 irq_default_host
= host
;
658 void irq_set_virq_count(unsigned int count
)
660 pr_debug("irq: Trying to set virq count to %d\n", count
);
662 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
664 irq_virq_count
= count
;
667 static int irq_setup_virq(struct irq_host
*host
, unsigned int virq
,
668 irq_hw_number_t hwirq
)
670 struct irq_desc
*desc
;
672 desc
= irq_to_desc_alloc_node(virq
, 0);
674 pr_debug("irq: -> allocating desc failed\n");
678 /* Clear IRQ_NOREQUEST flag */
679 desc
->status
&= ~IRQ_NOREQUEST
;
683 irq_map
[virq
].hwirq
= hwirq
;
686 if (host
->ops
->map(host
, virq
, hwirq
)) {
687 pr_debug("irq: -> mapping failed, freeing\n");
694 irq_free_virt(virq
, 1);
698 unsigned int irq_create_direct_mapping(struct irq_host
*host
)
703 host
= irq_default_host
;
705 BUG_ON(host
== NULL
);
706 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_NOMAP
);
708 virq
= irq_alloc_virt(host
, 1, 0);
709 if (virq
== NO_IRQ
) {
710 pr_debug("irq: create_direct virq allocation failed\n");
714 pr_debug("irq: create_direct obtained virq %d\n", virq
);
716 if (irq_setup_virq(host
, virq
, virq
))
722 unsigned int irq_create_mapping(struct irq_host
*host
,
723 irq_hw_number_t hwirq
)
725 unsigned int virq
, hint
;
727 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
729 /* Look for default host if nececssary */
731 host
= irq_default_host
;
733 printk(KERN_WARNING
"irq_create_mapping called for"
734 " NULL host, hwirq=%lx\n", hwirq
);
738 pr_debug("irq: -> using host @%p\n", host
);
740 /* Check if mapping already exist, if it does, call
741 * host->ops->map() to update the flags
743 virq
= irq_find_mapping(host
, hwirq
);
744 if (virq
!= NO_IRQ
) {
745 if (host
->ops
->remap
)
746 host
->ops
->remap(host
, virq
, hwirq
);
747 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
751 /* Get a virtual interrupt number */
752 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
754 virq
= (unsigned int)hwirq
;
755 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
759 /* Allocate a virtual interrupt number */
760 hint
= hwirq
% irq_virq_count
;
761 virq
= irq_alloc_virt(host
, 1, hint
);
762 if (virq
== NO_IRQ
) {
763 pr_debug("irq: -> virq allocation failed\n");
768 if (irq_setup_virq(host
, virq
, hwirq
))
771 printk(KERN_DEBUG
"irq: irq %lu on host %s mapped to virtual irq %u\n",
772 hwirq
, host
->of_node
? host
->of_node
->full_name
: "null", virq
);
776 EXPORT_SYMBOL_GPL(irq_create_mapping
);
778 unsigned int irq_create_of_mapping(struct device_node
*controller
,
779 const u32
*intspec
, unsigned int intsize
)
781 struct irq_host
*host
;
782 irq_hw_number_t hwirq
;
783 unsigned int type
= IRQ_TYPE_NONE
;
786 if (controller
== NULL
)
787 host
= irq_default_host
;
789 host
= irq_find_host(controller
);
791 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
792 controller
->full_name
);
796 /* If host has no translation, then we assume interrupt line */
797 if (host
->ops
->xlate
== NULL
)
800 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
806 virq
= irq_create_mapping(host
, hwirq
);
810 /* Set type if specified and different than the current one */
811 if (type
!= IRQ_TYPE_NONE
&&
812 type
!= (irq_to_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
813 set_irq_type(virq
, type
);
816 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
818 void irq_dispose_mapping(unsigned int virq
)
820 struct irq_host
*host
;
821 irq_hw_number_t hwirq
;
826 host
= irq_map
[virq
].host
;
827 WARN_ON (host
== NULL
);
831 /* Never unmap legacy interrupts */
832 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
835 /* remove chip and handler */
836 set_irq_chip_and_handler(virq
, NULL
, NULL
);
838 /* Make sure it's completed */
839 synchronize_irq(virq
);
841 /* Tell the PIC about it */
842 if (host
->ops
->unmap
)
843 host
->ops
->unmap(host
, virq
);
846 /* Clear reverse map */
847 hwirq
= irq_map
[virq
].hwirq
;
848 switch(host
->revmap_type
) {
849 case IRQ_HOST_MAP_LINEAR
:
850 if (hwirq
< host
->revmap_data
.linear
.size
)
851 host
->revmap_data
.linear
.revmap
[hwirq
] = NO_IRQ
;
853 case IRQ_HOST_MAP_TREE
:
855 * Check if radix tree allocated yet, if not then nothing to
859 if (revmap_trees_allocated
< 1)
861 mutex_lock(&revmap_trees_mutex
);
862 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
863 mutex_unlock(&revmap_trees_mutex
);
869 irq_map
[virq
].hwirq
= host
->inval_irq
;
872 irq_to_desc(virq
)->status
|= IRQ_NOREQUEST
;
875 irq_free_virt(virq
, 1);
877 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
879 unsigned int irq_find_mapping(struct irq_host
*host
,
880 irq_hw_number_t hwirq
)
883 unsigned int hint
= hwirq
% irq_virq_count
;
885 /* Look for default host if nececssary */
887 host
= irq_default_host
;
891 /* legacy -> bail early */
892 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
895 /* Slow path does a linear search of the map */
896 if (hint
< NUM_ISA_INTERRUPTS
)
897 hint
= NUM_ISA_INTERRUPTS
;
900 if (irq_map
[i
].host
== host
&&
901 irq_map
[i
].hwirq
== hwirq
)
904 if (i
>= irq_virq_count
)
905 i
= NUM_ISA_INTERRUPTS
;
909 EXPORT_SYMBOL_GPL(irq_find_mapping
);
912 unsigned int irq_radix_revmap_lookup(struct irq_host
*host
,
913 irq_hw_number_t hwirq
)
915 struct irq_map_entry
*ptr
;
918 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
921 * Check if the radix tree exists and has bee initialized.
922 * If not, we fallback to slow mode
924 if (revmap_trees_allocated
< 2)
925 return irq_find_mapping(host
, hwirq
);
927 /* Now try to resolve */
929 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
930 * as it's referencing an entry in the static irq_map table.
932 ptr
= radix_tree_lookup(&host
->revmap_data
.tree
, hwirq
);
935 * If found in radix tree, then fine.
936 * Else fallback to linear lookup - this should not happen in practice
937 * as it means that we failed to insert the node in the radix tree.
940 virq
= ptr
- irq_map
;
942 virq
= irq_find_mapping(host
, hwirq
);
947 void irq_radix_revmap_insert(struct irq_host
*host
, unsigned int virq
,
948 irq_hw_number_t hwirq
)
951 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
954 * Check if the radix tree exists yet.
955 * If not, then the irq will be inserted into the tree when it gets
959 if (revmap_trees_allocated
< 1)
962 if (virq
!= NO_IRQ
) {
963 mutex_lock(&revmap_trees_mutex
);
964 radix_tree_insert(&host
->revmap_data
.tree
, hwirq
,
966 mutex_unlock(&revmap_trees_mutex
);
970 unsigned int irq_linear_revmap(struct irq_host
*host
,
971 irq_hw_number_t hwirq
)
973 unsigned int *revmap
;
975 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
977 /* Check revmap bounds */
978 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
979 return irq_find_mapping(host
, hwirq
);
981 /* Check if revmap was allocated */
982 revmap
= host
->revmap_data
.linear
.revmap
;
983 if (unlikely(revmap
== NULL
))
984 return irq_find_mapping(host
, hwirq
);
986 /* Fill up revmap with slow path if no mapping found */
987 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
988 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
990 return revmap
[hwirq
];
993 unsigned int irq_alloc_virt(struct irq_host
*host
,
998 unsigned int i
, j
, found
= NO_IRQ
;
1000 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
1003 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
1005 /* Use hint for 1 interrupt if any */
1006 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
1007 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
1012 /* Look for count consecutive numbers in the allocatable
1013 * (non-legacy) space
1015 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
1016 if (irq_map
[i
].host
!= NULL
)
1022 found
= i
- count
+ 1;
1026 if (found
== NO_IRQ
) {
1027 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
1031 for (i
= found
; i
< (found
+ count
); i
++) {
1032 irq_map
[i
].hwirq
= host
->inval_irq
;
1034 irq_map
[i
].host
= host
;
1036 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
1040 void irq_free_virt(unsigned int virq
, unsigned int count
)
1042 unsigned long flags
;
1045 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
1046 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
1048 raw_spin_lock_irqsave(&irq_big_lock
, flags
);
1049 for (i
= virq
; i
< (virq
+ count
); i
++) {
1050 struct irq_host
*host
;
1052 if (i
< NUM_ISA_INTERRUPTS
||
1053 (virq
+ count
) > irq_virq_count
)
1056 host
= irq_map
[i
].host
;
1057 irq_map
[i
].hwirq
= host
->inval_irq
;
1059 irq_map
[i
].host
= NULL
;
1061 raw_spin_unlock_irqrestore(&irq_big_lock
, flags
);
1064 int arch_early_irq_init(void)
1066 struct irq_desc
*desc
;
1069 for (i
= 0; i
< NR_IRQS
; i
++) {
1070 desc
= irq_to_desc(i
);
1072 desc
->status
|= IRQ_NOREQUEST
;
1078 int arch_init_chip_data(struct irq_desc
*desc
, int node
)
1080 desc
->status
|= IRQ_NOREQUEST
;
1084 /* We need to create the radix trees late */
1085 static int irq_late_init(void)
1091 * No mutual exclusion with respect to accessors of the tree is needed
1092 * here as the synchronization is done via the state variable
1093 * revmap_trees_allocated.
1095 list_for_each_entry(h
, &irq_hosts
, link
) {
1096 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
1097 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_KERNEL
);
1101 * Make sure the radix trees inits are visible before setting
1105 revmap_trees_allocated
= 1;
1108 * Insert the reverse mapping for those interrupts already present
1111 mutex_lock(&revmap_trees_mutex
);
1112 for (i
= 0; i
< irq_virq_count
; i
++) {
1113 if (irq_map
[i
].host
&&
1114 (irq_map
[i
].host
->revmap_type
== IRQ_HOST_MAP_TREE
))
1115 radix_tree_insert(&irq_map
[i
].host
->revmap_data
.tree
,
1116 irq_map
[i
].hwirq
, &irq_map
[i
]);
1118 mutex_unlock(&revmap_trees_mutex
);
1121 * Make sure the radix trees insertions are visible before setting
1125 revmap_trees_allocated
= 2;
1129 arch_initcall(irq_late_init
);
1131 #ifdef CONFIG_VIRQ_DEBUG
1132 static int virq_debug_show(struct seq_file
*m
, void *private)
1134 unsigned long flags
;
1135 struct irq_desc
*desc
;
1137 char none
[] = "none";
1140 seq_printf(m
, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1141 "chip name", "host name");
1143 for (i
= 1; i
< nr_irqs
; i
++) {
1144 desc
= irq_to_desc(i
);
1148 raw_spin_lock_irqsave(&desc
->lock
, flags
);
1150 if (desc
->action
&& desc
->action
->handler
) {
1151 seq_printf(m
, "%5d ", i
);
1152 seq_printf(m
, "0x%05lx ", virq_to_hw(i
));
1154 if (desc
->chip
&& desc
->chip
->name
)
1155 p
= desc
->chip
->name
;
1158 seq_printf(m
, "%-15s ", p
);
1160 if (irq_map
[i
].host
&& irq_map
[i
].host
->of_node
)
1161 p
= irq_map
[i
].host
->of_node
->full_name
;
1164 seq_printf(m
, "%s\n", p
);
1167 raw_spin_unlock_irqrestore(&desc
->lock
, flags
);
1173 static int virq_debug_open(struct inode
*inode
, struct file
*file
)
1175 return single_open(file
, virq_debug_show
, inode
->i_private
);
1178 static const struct file_operations virq_debug_fops
= {
1179 .open
= virq_debug_open
,
1181 .llseek
= seq_lseek
,
1182 .release
= single_release
,
1185 static int __init
irq_debugfs_init(void)
1187 if (debugfs_create_file("virq_mapping", S_IRUGO
, powerpc_debugfs_root
,
1188 NULL
, &virq_debug_fops
) == NULL
)
1193 __initcall(irq_debugfs_init
);
1194 #endif /* CONFIG_VIRQ_DEBUG */
1197 static int __init
setup_noirqdistrib(char *str
)
1199 distribute_irqs
= 0;
1203 __setup("noirqdistrib", setup_noirqdistrib
);
1204 #endif /* CONFIG_PPC64 */