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)
10 * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
17 * This file contains the code used by various IRQ handling routines:
18 * asking for different IRQ's should be done through these routines
19 * instead of just grabbing them. Thus setups with different IRQ numbers
20 * shouldn't result in any weird surprises, and installing new handlers
23 * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the
24 * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit
25 * mask register (of which only 16 are defined), hence the weird shifting
26 * and complement of the cached_irq_mask. I want to be able to stuff
27 * this right into the SIU SMASK register.
28 * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
29 * to reduce code space and undefined function references.
34 #include <linux/module.h>
35 #include <linux/threads.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/signal.h>
38 #include <linux/sched.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/interrupt.h>
42 #include <linux/timex.h>
43 #include <linux/init.h>
44 #include <linux/slab.h>
45 #include <linux/delay.h>
46 #include <linux/irq.h>
47 #include <linux/seq_file.h>
48 #include <linux/cpumask.h>
49 #include <linux/profile.h>
50 #include <linux/bitops.h>
51 #include <linux/list.h>
52 #include <linux/radix-tree.h>
53 #include <linux/mutex.h>
54 #include <linux/bootmem.h>
55 #include <linux/pci.h>
57 #include <asm/uaccess.h>
58 #include <asm/system.h>
60 #include <asm/pgtable.h>
62 #include <asm/cache.h>
64 #include <asm/ptrace.h>
65 #include <asm/machdep.h>
69 #include <asm/firmware.h>
72 int __irq_offset_value
;
73 static int ppc_spurious_interrupts
;
76 EXPORT_SYMBOL(__irq_offset_value
);
77 atomic_t ppc_n_lost_interrupts
;
79 #ifndef CONFIG_PPC_MERGE
80 #define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
81 unsigned long ppc_cached_irq_mask
[NR_MASK_WORDS
];
85 extern int tau_initialized
;
86 extern int tau_interrupts(int);
88 #endif /* CONFIG_PPC32 */
90 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
91 extern atomic_t ipi_recv
;
92 extern atomic_t ipi_sent
;
96 EXPORT_SYMBOL(irq_desc
);
98 int distribute_irqs
= 1;
100 static inline 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 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 void 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 if (firmware_has_feature(FW_FEATURE_ISERIES
)) {
131 * Do we need to disable preemption here? Not really: in the
132 * unlikely event that we're preempted to a different cpu in
133 * between getting r13, loading its lppaca_ptr, and loading
134 * its any_int, we might call iseries_handle_interrupts without
135 * an interrupt pending on the new cpu, but that's no disaster,
136 * is it? And the business of preempting us off the old cpu
137 * would itself involve a local_irq_restore which handles the
138 * interrupt to that cpu.
140 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
141 * to avoid any preemption checking added into get_paca().
143 if (local_paca
->lppaca_ptr
->int_dword
.any_int
)
144 iseries_handle_interrupts();
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 #endif /* CONFIG_PPC64 */
169 int show_interrupts(struct seq_file
*p
, void *v
)
171 int i
= *(loff_t
*)v
, j
;
172 struct irqaction
*action
;
178 for_each_online_cpu(j
)
179 seq_printf(p
, "CPU%d ", j
);
184 desc
= get_irq_desc(i
);
185 spin_lock_irqsave(&desc
->lock
, flags
);
186 action
= desc
->action
;
187 if (!action
|| !action
->handler
)
189 seq_printf(p
, "%3d: ", i
);
191 for_each_online_cpu(j
)
192 seq_printf(p
, "%10u ", kstat_cpu(j
).irqs
[i
]);
194 seq_printf(p
, "%10u ", kstat_irqs(i
));
195 #endif /* CONFIG_SMP */
197 seq_printf(p
, " %s ", desc
->chip
->typename
);
199 seq_puts(p
, " None ");
200 seq_printf(p
, "%s", (desc
->status
& IRQ_LEVEL
) ? "Level " : "Edge ");
201 seq_printf(p
, " %s", action
->name
);
202 for (action
= action
->next
; action
; action
= action
->next
)
203 seq_printf(p
, ", %s", action
->name
);
206 spin_unlock_irqrestore(&desc
->lock
, flags
);
207 } else if (i
== NR_IRQS
) {
209 #ifdef CONFIG_TAU_INT
210 if (tau_initialized
){
211 seq_puts(p
, "TAU: ");
212 for_each_online_cpu(j
)
213 seq_printf(p
, "%10u ", tau_interrupts(j
));
214 seq_puts(p
, " PowerPC Thermal Assist (cpu temp)\n");
217 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
218 /* should this be per processor send/receive? */
219 seq_printf(p
, "IPI (recv/sent): %10u/%u\n",
220 atomic_read(&ipi_recv
), atomic_read(&ipi_sent
));
222 #endif /* CONFIG_PPC32 */
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 cpus_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 -1 to
285 * indicate there are no more pending.
286 * The value -2 is for buggy hardware and means that this IRQ
287 * 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
;
301 irqtp
->task
= curtp
->task
;
303 call_handle_irq(irq
, desc
, irqtp
, handler
);
306 set_bits(irqtp
->flags
, &curtp
->flags
);
309 generic_handle_irq(irq
);
310 } else if (irq
!= NO_IRQ_IGNORE
)
311 /* That's not SMP safe ... but who cares ? */
312 ppc_spurious_interrupts
++;
315 set_irq_regs(old_regs
);
317 #ifdef CONFIG_PPC_ISERIES
318 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
319 get_lppaca()->int_dword
.fields
.decr_int
) {
320 get_lppaca()->int_dword
.fields
.decr_int
= 0;
321 /* Signal a fake decrementer interrupt */
322 timer_interrupt(regs
);
327 void __init
init_IRQ(void)
336 #ifdef CONFIG_IRQSTACKS
337 struct thread_info
*softirq_ctx
[NR_CPUS
] __read_mostly
;
338 struct thread_info
*hardirq_ctx
[NR_CPUS
] __read_mostly
;
340 void irq_ctx_init(void)
342 struct thread_info
*tp
;
345 for_each_possible_cpu(i
) {
346 memset((void *)softirq_ctx
[i
], 0, THREAD_SIZE
);
349 tp
->preempt_count
= SOFTIRQ_OFFSET
;
351 memset((void *)hardirq_ctx
[i
], 0, THREAD_SIZE
);
354 tp
->preempt_count
= HARDIRQ_OFFSET
;
358 static inline void do_softirq_onstack(void)
360 struct thread_info
*curtp
, *irqtp
;
362 curtp
= current_thread_info();
363 irqtp
= softirq_ctx
[smp_processor_id()];
364 irqtp
->task
= curtp
->task
;
365 call_do_softirq(irqtp
);
370 #define do_softirq_onstack() __do_softirq()
371 #endif /* CONFIG_IRQSTACKS */
373 void do_softirq(void)
380 local_irq_save(flags
);
382 if (local_softirq_pending())
383 do_softirq_onstack();
385 local_irq_restore(flags
);
387 EXPORT_SYMBOL(do_softirq
);
391 * IRQ controller and virtual interrupts
394 #ifdef CONFIG_PPC_MERGE
396 static LIST_HEAD(irq_hosts
);
397 static spinlock_t irq_big_lock
= SPIN_LOCK_UNLOCKED
;
398 static DEFINE_PER_CPU(unsigned int, irq_radix_reader
);
399 static unsigned int irq_radix_writer
;
400 struct irq_map_entry irq_map
[NR_IRQS
];
401 static unsigned int irq_virq_count
= NR_IRQS
;
402 static struct irq_host
*irq_default_host
;
404 struct irq_host
*irq_alloc_host(unsigned int revmap_type
,
405 unsigned int revmap_arg
,
406 struct irq_host_ops
*ops
,
407 irq_hw_number_t inval_irq
)
409 struct irq_host
*host
;
410 unsigned int size
= sizeof(struct irq_host
);
415 /* Allocate structure and revmap table if using linear mapping */
416 if (revmap_type
== IRQ_HOST_MAP_LINEAR
)
417 size
+= revmap_arg
* sizeof(unsigned int);
419 host
= kzalloc(size
, GFP_KERNEL
);
421 host
= alloc_bootmem(size
);
423 memset(host
, 0, size
);
429 host
->revmap_type
= revmap_type
;
430 host
->inval_irq
= inval_irq
;
433 spin_lock_irqsave(&irq_big_lock
, flags
);
435 /* If it's a legacy controller, check for duplicates and
436 * mark it as allocated (we use irq 0 host pointer for that
438 if (revmap_type
== IRQ_HOST_MAP_LEGACY
) {
439 if (irq_map
[0].host
!= NULL
) {
440 spin_unlock_irqrestore(&irq_big_lock
, flags
);
441 /* If we are early boot, we can't free the structure,
443 * this will be fixed once slab is made available early
444 * instead of the current cruft
450 irq_map
[0].host
= host
;
453 list_add(&host
->link
, &irq_hosts
);
454 spin_unlock_irqrestore(&irq_big_lock
, flags
);
456 /* Additional setups per revmap type */
457 switch(revmap_type
) {
458 case IRQ_HOST_MAP_LEGACY
:
459 /* 0 is always the invalid number for legacy */
461 /* setup us as the host for all legacy interrupts */
462 for (i
= 1; i
< NUM_ISA_INTERRUPTS
; i
++) {
463 irq_map
[i
].hwirq
= 0;
465 irq_map
[i
].host
= host
;
468 /* Clear norequest flags */
469 get_irq_desc(i
)->status
&= ~IRQ_NOREQUEST
;
471 /* Legacy flags are left to default at this point,
472 * one can then use irq_create_mapping() to
473 * explicitely change them
475 ops
->map(host
, i
, i
);
478 case IRQ_HOST_MAP_LINEAR
:
479 rmap
= (unsigned int *)(host
+ 1);
480 for (i
= 0; i
< revmap_arg
; i
++)
482 host
->revmap_data
.linear
.size
= revmap_arg
;
484 host
->revmap_data
.linear
.revmap
= rmap
;
490 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type
, host
);
495 struct irq_host
*irq_find_host(struct device_node
*node
)
497 struct irq_host
*h
, *found
= NULL
;
500 /* We might want to match the legacy controller last since
501 * it might potentially be set to match all interrupts in
502 * the absence of a device node. This isn't a problem so far
505 spin_lock_irqsave(&irq_big_lock
, flags
);
506 list_for_each_entry(h
, &irq_hosts
, link
)
507 if (h
->ops
->match
== NULL
|| h
->ops
->match(h
, node
)) {
511 spin_unlock_irqrestore(&irq_big_lock
, flags
);
514 EXPORT_SYMBOL_GPL(irq_find_host
);
516 void irq_set_default_host(struct irq_host
*host
)
518 pr_debug("irq: Default host set to @0x%p\n", host
);
520 irq_default_host
= host
;
523 void irq_set_virq_count(unsigned int count
)
525 pr_debug("irq: Trying to set virq count to %d\n", count
);
527 BUG_ON(count
< NUM_ISA_INTERRUPTS
);
529 irq_virq_count
= count
;
532 /* radix tree not lockless safe ! we use a brlock-type mecanism
533 * for now, until we can use a lockless radix tree
535 static void irq_radix_wrlock(unsigned long *flags
)
537 unsigned int cpu
, ok
;
539 spin_lock_irqsave(&irq_big_lock
, *flags
);
540 irq_radix_writer
= 1;
545 for_each_possible_cpu(cpu
) {
546 if (per_cpu(irq_radix_reader
, cpu
)) {
556 static void irq_radix_wrunlock(unsigned long flags
)
559 irq_radix_writer
= 0;
560 spin_unlock_irqrestore(&irq_big_lock
, flags
);
563 static void irq_radix_rdlock(unsigned long *flags
)
565 local_irq_save(*flags
);
566 __get_cpu_var(irq_radix_reader
) = 1;
568 if (likely(irq_radix_writer
== 0))
570 __get_cpu_var(irq_radix_reader
) = 0;
572 spin_lock(&irq_big_lock
);
573 __get_cpu_var(irq_radix_reader
) = 1;
574 spin_unlock(&irq_big_lock
);
577 static void irq_radix_rdunlock(unsigned long flags
)
579 __get_cpu_var(irq_radix_reader
) = 0;
580 local_irq_restore(flags
);
584 unsigned int irq_create_mapping(struct irq_host
*host
,
585 irq_hw_number_t hwirq
)
587 unsigned int virq
, hint
;
589 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host
, hwirq
);
591 /* Look for default host if nececssary */
593 host
= irq_default_host
;
595 printk(KERN_WARNING
"irq_create_mapping called for"
596 " NULL host, hwirq=%lx\n", hwirq
);
600 pr_debug("irq: -> using host @%p\n", host
);
602 /* Check if mapping already exist, if it does, call
603 * host->ops->map() to update the flags
605 virq
= irq_find_mapping(host
, hwirq
);
606 if (virq
!= IRQ_NONE
) {
607 if (host
->ops
->remap
)
608 host
->ops
->remap(host
, virq
, hwirq
);
609 pr_debug("irq: -> existing mapping on virq %d\n", virq
);
613 /* Get a virtual interrupt number */
614 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
) {
616 virq
= (unsigned int)hwirq
;
617 if (virq
== 0 || virq
>= NUM_ISA_INTERRUPTS
)
621 /* Allocate a virtual interrupt number */
622 hint
= hwirq
% irq_virq_count
;
623 virq
= irq_alloc_virt(host
, 1, hint
);
624 if (virq
== NO_IRQ
) {
625 pr_debug("irq: -> virq allocation failed\n");
629 pr_debug("irq: -> obtained virq %d\n", virq
);
631 /* Clear IRQ_NOREQUEST flag */
632 get_irq_desc(virq
)->status
&= ~IRQ_NOREQUEST
;
636 irq_map
[virq
].hwirq
= hwirq
;
638 if (host
->ops
->map(host
, virq
, hwirq
)) {
639 pr_debug("irq: -> mapping failed, freeing\n");
640 irq_free_virt(virq
, 1);
645 EXPORT_SYMBOL_GPL(irq_create_mapping
);
647 unsigned int irq_create_of_mapping(struct device_node
*controller
,
648 u32
*intspec
, unsigned int intsize
)
650 struct irq_host
*host
;
651 irq_hw_number_t hwirq
;
652 unsigned int type
= IRQ_TYPE_NONE
;
655 if (controller
== NULL
)
656 host
= irq_default_host
;
658 host
= irq_find_host(controller
);
660 printk(KERN_WARNING
"irq: no irq host found for %s !\n",
661 controller
->full_name
);
665 /* If host has no translation, then we assume interrupt line */
666 if (host
->ops
->xlate
== NULL
)
669 if (host
->ops
->xlate(host
, controller
, intspec
, intsize
,
675 virq
= irq_create_mapping(host
, hwirq
);
679 /* Set type if specified and different than the current one */
680 if (type
!= IRQ_TYPE_NONE
&&
681 type
!= (get_irq_desc(virq
)->status
& IRQF_TRIGGER_MASK
))
682 set_irq_type(virq
, type
);
685 EXPORT_SYMBOL_GPL(irq_create_of_mapping
);
687 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
691 if (of_irq_map_one(dev
, index
, &oirq
))
694 return irq_create_of_mapping(oirq
.controller
, oirq
.specifier
,
697 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
699 void irq_dispose_mapping(unsigned int virq
)
701 struct irq_host
*host
;
702 irq_hw_number_t hwirq
;
708 host
= irq_map
[virq
].host
;
709 WARN_ON (host
== NULL
);
713 /* Never unmap legacy interrupts */
714 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
717 /* remove chip and handler */
718 set_irq_chip_and_handler(virq
, NULL
, NULL
);
720 /* Make sure it's completed */
721 synchronize_irq(virq
);
723 /* Tell the PIC about it */
724 if (host
->ops
->unmap
)
725 host
->ops
->unmap(host
, virq
);
728 /* Clear reverse map */
729 hwirq
= irq_map
[virq
].hwirq
;
730 switch(host
->revmap_type
) {
731 case IRQ_HOST_MAP_LINEAR
:
732 if (hwirq
< host
->revmap_data
.linear
.size
)
733 host
->revmap_data
.linear
.revmap
[hwirq
] = IRQ_NONE
;
735 case IRQ_HOST_MAP_TREE
:
736 /* Check if radix tree allocated yet */
737 if (host
->revmap_data
.tree
.gfp_mask
== 0)
739 irq_radix_wrlock(&flags
);
740 radix_tree_delete(&host
->revmap_data
.tree
, hwirq
);
741 irq_radix_wrunlock(flags
);
747 irq_map
[virq
].hwirq
= host
->inval_irq
;
750 get_irq_desc(virq
)->status
|= IRQ_NOREQUEST
;
753 irq_free_virt(virq
, 1);
755 EXPORT_SYMBOL_GPL(irq_dispose_mapping
);
757 unsigned int irq_find_mapping(struct irq_host
*host
,
758 irq_hw_number_t hwirq
)
761 unsigned int hint
= hwirq
% irq_virq_count
;
763 /* Look for default host if nececssary */
765 host
= irq_default_host
;
769 /* legacy -> bail early */
770 if (host
->revmap_type
== IRQ_HOST_MAP_LEGACY
)
773 /* Slow path does a linear search of the map */
774 if (hint
< NUM_ISA_INTERRUPTS
)
775 hint
= NUM_ISA_INTERRUPTS
;
778 if (irq_map
[i
].host
== host
&&
779 irq_map
[i
].hwirq
== hwirq
)
782 if (i
>= irq_virq_count
)
783 i
= NUM_ISA_INTERRUPTS
;
787 EXPORT_SYMBOL_GPL(irq_find_mapping
);
790 unsigned int irq_radix_revmap(struct irq_host
*host
,
791 irq_hw_number_t hwirq
)
793 struct radix_tree_root
*tree
;
794 struct irq_map_entry
*ptr
;
798 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_TREE
);
800 /* Check if the radix tree exist yet. We test the value of
801 * the gfp_mask for that. Sneaky but saves another int in the
802 * structure. If not, we fallback to slow mode
804 tree
= &host
->revmap_data
.tree
;
805 if (tree
->gfp_mask
== 0)
806 return irq_find_mapping(host
, hwirq
);
808 /* Now try to resolve */
809 irq_radix_rdlock(&flags
);
810 ptr
= radix_tree_lookup(tree
, hwirq
);
811 irq_radix_rdunlock(flags
);
813 /* Found it, return */
815 virq
= ptr
- irq_map
;
819 /* If not there, try to insert it */
820 virq
= irq_find_mapping(host
, hwirq
);
821 if (virq
!= NO_IRQ
) {
822 irq_radix_wrlock(&flags
);
823 radix_tree_insert(tree
, hwirq
, &irq_map
[virq
]);
824 irq_radix_wrunlock(flags
);
829 unsigned int irq_linear_revmap(struct irq_host
*host
,
830 irq_hw_number_t hwirq
)
832 unsigned int *revmap
;
834 WARN_ON(host
->revmap_type
!= IRQ_HOST_MAP_LINEAR
);
836 /* Check revmap bounds */
837 if (unlikely(hwirq
>= host
->revmap_data
.linear
.size
))
838 return irq_find_mapping(host
, hwirq
);
840 /* Check if revmap was allocated */
841 revmap
= host
->revmap_data
.linear
.revmap
;
842 if (unlikely(revmap
== NULL
))
843 return irq_find_mapping(host
, hwirq
);
845 /* Fill up revmap with slow path if no mapping found */
846 if (unlikely(revmap
[hwirq
] == NO_IRQ
))
847 revmap
[hwirq
] = irq_find_mapping(host
, hwirq
);
849 return revmap
[hwirq
];
852 unsigned int irq_alloc_virt(struct irq_host
*host
,
857 unsigned int i
, j
, found
= NO_IRQ
;
859 if (count
== 0 || count
> (irq_virq_count
- NUM_ISA_INTERRUPTS
))
862 spin_lock_irqsave(&irq_big_lock
, flags
);
864 /* Use hint for 1 interrupt if any */
865 if (count
== 1 && hint
>= NUM_ISA_INTERRUPTS
&&
866 hint
< irq_virq_count
&& irq_map
[hint
].host
== NULL
) {
871 /* Look for count consecutive numbers in the allocatable
874 for (i
= NUM_ISA_INTERRUPTS
, j
= 0; i
< irq_virq_count
; i
++) {
875 if (irq_map
[i
].host
!= NULL
)
881 found
= i
- count
+ 1;
885 if (found
== NO_IRQ
) {
886 spin_unlock_irqrestore(&irq_big_lock
, flags
);
890 for (i
= found
; i
< (found
+ count
); i
++) {
891 irq_map
[i
].hwirq
= host
->inval_irq
;
893 irq_map
[i
].host
= host
;
895 spin_unlock_irqrestore(&irq_big_lock
, flags
);
899 void irq_free_virt(unsigned int virq
, unsigned int count
)
904 WARN_ON (virq
< NUM_ISA_INTERRUPTS
);
905 WARN_ON (count
== 0 || (virq
+ count
) > irq_virq_count
);
907 spin_lock_irqsave(&irq_big_lock
, flags
);
908 for (i
= virq
; i
< (virq
+ count
); i
++) {
909 struct irq_host
*host
;
911 if (i
< NUM_ISA_INTERRUPTS
||
912 (virq
+ count
) > irq_virq_count
)
915 host
= irq_map
[i
].host
;
916 irq_map
[i
].hwirq
= host
->inval_irq
;
918 irq_map
[i
].host
= NULL
;
920 spin_unlock_irqrestore(&irq_big_lock
, flags
);
923 void irq_early_init(void)
927 for (i
= 0; i
< NR_IRQS
; i
++)
928 get_irq_desc(i
)->status
|= IRQ_NOREQUEST
;
931 /* We need to create the radix trees late */
932 static int irq_late_init(void)
937 irq_radix_wrlock(&flags
);
938 list_for_each_entry(h
, &irq_hosts
, link
) {
939 if (h
->revmap_type
== IRQ_HOST_MAP_TREE
)
940 INIT_RADIX_TREE(&h
->revmap_data
.tree
, GFP_ATOMIC
);
942 irq_radix_wrunlock(flags
);
946 arch_initcall(irq_late_init
);
948 #endif /* CONFIG_PPC_MERGE */
950 #ifdef CONFIG_PCI_MSI
951 int pci_enable_msi(struct pci_dev
* pdev
)
953 if (ppc_md
.enable_msi
)
954 return ppc_md
.enable_msi(pdev
);
958 EXPORT_SYMBOL(pci_enable_msi
);
960 void pci_disable_msi(struct pci_dev
* pdev
)
962 if (ppc_md
.disable_msi
)
963 ppc_md
.disable_msi(pdev
);
965 EXPORT_SYMBOL(pci_disable_msi
);
967 void pci_scan_msi_device(struct pci_dev
*dev
) {}
968 int pci_enable_msix(struct pci_dev
* dev
, struct msix_entry
*entries
, int nvec
) {return -1;}
969 void pci_disable_msix(struct pci_dev
*dev
) {}
970 void msi_remove_pci_irq_vectors(struct pci_dev
*dev
) {}
971 void disable_msi_mode(struct pci_dev
*dev
, int pos
, int type
) {}
972 void pci_no_msi(void) {}
973 EXPORT_SYMBOL(pci_enable_msix
);
974 EXPORT_SYMBOL(pci_disable_msix
);
979 static int __init
setup_noirqdistrib(char *str
)
985 __setup("noirqdistrib", setup_noirqdistrib
);
986 #endif /* CONFIG_PPC64 */