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 <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>
70 #include <asm/lv1call.h>
73 int __irq_offset_value;
74 static int ppc_spurious_interrupts;
77 EXPORT_SYMBOL(__irq_offset_value);
78 atomic_t ppc_n_lost_interrupts;
81 extern int tau_initialized;
82 extern int tau_interrupts(int);
84 #endif /* CONFIG_PPC32 */
87 EXPORT_SYMBOL(irq_desc);
89 int distribute_irqs = 1;
91 static inline notrace unsigned long get_hard_enabled(void)
93 unsigned long enabled;
95 __asm__ __volatile__("lbz %0,%1(13)"
96 : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
101 static inline notrace void set_soft_enabled(unsigned long enable)
103 __asm__ __volatile__("stb %0,%1(13)"
104 : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
107 #ifdef CONFIG_PERF_COUNTERS
108 notrace void __weak perf_counter_do_pending(void)
110 set_perf_counter_pending(0);
114 notrace void raw_local_irq_restore(unsigned long en)
117 * get_paca()->soft_enabled = en;
118 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
119 * That was allowed before, and in such a case we do need to take care
120 * that gcc will set soft_enabled directly via r13, not choose to use
121 * an intermediate register, lest we're preempted to a different cpu.
123 set_soft_enabled(en);
127 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
129 * Do we need to disable preemption here? Not really: in the
130 * unlikely event that we're preempted to a different cpu in
131 * between getting r13, loading its lppaca_ptr, and loading
132 * its any_int, we might call iseries_handle_interrupts without
133 * an interrupt pending on the new cpu, but that's no disaster,
134 * is it? And the business of preempting us off the old cpu
135 * would itself involve a local_irq_restore which handles the
136 * interrupt to that cpu.
138 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
139 * to avoid any preemption checking added into get_paca().
141 if (local_paca->lppaca_ptr->int_dword.any_int)
142 iseries_handle_interrupts();
145 if (get_perf_counter_pending())
146 perf_counter_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 void do_IRQ(struct pt_regs *regs)
263 struct pt_regs *old_regs = set_irq_regs(regs);
265 #ifdef CONFIG_IRQSTACKS
266 struct thread_info *curtp, *irqtp;
271 #ifdef CONFIG_DEBUG_STACKOVERFLOW
272 /* Debugging check for stack overflow: is there less than 2KB free? */
276 sp = __get_SP() & (THREAD_SIZE-1);
278 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
279 printk("do_IRQ: stack overflow: %ld\n",
280 sp - sizeof(struct thread_info));
287 * Every platform is required to implement ppc_md.get_irq.
288 * This function will either return an irq number or NO_IRQ to
289 * indicate there are no more pending.
290 * The value NO_IRQ_IGNORE is for buggy hardware and means that this
291 * IRQ has already been handled. -- Tom
293 irq = ppc_md.get_irq();
295 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
296 #ifdef CONFIG_IRQSTACKS
297 /* Switch to the irq stack to handle this */
298 curtp = current_thread_info();
299 irqtp = hardirq_ctx[smp_processor_id()];
300 if (curtp != irqtp) {
301 struct irq_desc *desc = irq_desc + irq;
302 void *handler = desc->handle_irq;
303 unsigned long saved_sp_limit = current->thread.ksp_limit;
306 irqtp->task = curtp->task;
309 /* Copy the softirq bits in preempt_count so that the
310 * softirq checks work in the hardirq context.
312 irqtp->preempt_count =
313 (irqtp->preempt_count & ~SOFTIRQ_MASK) |
314 (curtp->preempt_count & SOFTIRQ_MASK);
316 current->thread.ksp_limit = (unsigned long)irqtp +
317 _ALIGN_UP(sizeof(struct thread_info), 16);
318 call_handle_irq(irq, desc, irqtp, handler);
319 current->thread.ksp_limit = saved_sp_limit;
323 /* Set any flag that may have been set on the
327 set_bits(irqtp->flags, &curtp->flags);
330 generic_handle_irq(irq);
331 } else if (irq != NO_IRQ_IGNORE)
332 /* That's not SMP safe ... but who cares ? */
333 ppc_spurious_interrupts++;
336 set_irq_regs(old_regs);
338 #ifdef CONFIG_PPC_ISERIES
339 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
340 get_lppaca()->int_dword.fields.decr_int) {
341 get_lppaca()->int_dword.fields.decr_int = 0;
342 /* Signal a fake decrementer interrupt */
343 timer_interrupt(regs);
348 void __init init_IRQ(void)
358 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
359 struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
360 struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
361 struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
363 void exc_lvl_ctx_init(void)
365 struct thread_info *tp;
368 for_each_possible_cpu(i) {
369 memset((void *)critirq_ctx[i], 0, THREAD_SIZE);
372 tp->preempt_count = 0;
375 memset((void *)dbgirq_ctx[i], 0, THREAD_SIZE);
378 tp->preempt_count = 0;
380 memset((void *)mcheckirq_ctx[i], 0, THREAD_SIZE);
381 tp = mcheckirq_ctx[i];
383 tp->preempt_count = HARDIRQ_OFFSET;
389 #ifdef CONFIG_IRQSTACKS
390 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
391 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
393 void irq_ctx_init(void)
395 struct thread_info *tp;
398 for_each_possible_cpu(i) {
399 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
402 tp->preempt_count = 0;
404 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
407 tp->preempt_count = HARDIRQ_OFFSET;
411 static inline void do_softirq_onstack(void)
413 struct thread_info *curtp, *irqtp;
414 unsigned long saved_sp_limit = current->thread.ksp_limit;
416 curtp = current_thread_info();
417 irqtp = softirq_ctx[smp_processor_id()];
418 irqtp->task = curtp->task;
419 current->thread.ksp_limit = (unsigned long)irqtp +
420 _ALIGN_UP(sizeof(struct thread_info), 16);
421 call_do_softirq(irqtp);
422 current->thread.ksp_limit = saved_sp_limit;
427 #define do_softirq_onstack() __do_softirq()
428 #endif /* CONFIG_IRQSTACKS */
430 void do_softirq(void)
437 local_irq_save(flags);
439 if (local_softirq_pending())
440 do_softirq_onstack();
442 local_irq_restore(flags);
447 * IRQ controller and virtual interrupts
450 static LIST_HEAD(irq_hosts);
451 static DEFINE_SPINLOCK(irq_big_lock);
452 static unsigned int revmap_trees_allocated;
453 static DEFINE_MUTEX(revmap_trees_mutex);
454 struct irq_map_entry irq_map[NR_IRQS];
455 static unsigned int irq_virq_count = NR_IRQS;
456 static struct irq_host *irq_default_host;
458 irq_hw_number_t virq_to_hw(unsigned int virq)
460 return irq_map[virq].hwirq;
462 EXPORT_SYMBOL_GPL(virq_to_hw);
464 static int default_irq_host_match(struct irq_host *h, struct device_node *np)
466 return h->of_node != NULL && h->of_node == np;
469 struct irq_host *irq_alloc_host(struct device_node *of_node,
470 unsigned int revmap_type,
471 unsigned int revmap_arg,
472 struct irq_host_ops *ops,
473 irq_hw_number_t inval_irq)
475 struct irq_host *host;
476 unsigned int size = sizeof(struct irq_host);
481 /* Allocate structure and revmap table if using linear mapping */
482 if (revmap_type == IRQ_HOST_MAP_LINEAR)
483 size += revmap_arg * sizeof(unsigned int);
484 host = zalloc_maybe_bootmem(size, GFP_KERNEL);
489 host->revmap_type = revmap_type;
490 host->inval_irq = inval_irq;
492 host->of_node = of_node_get(of_node);
494 if (host->ops->match == NULL)
495 host->ops->match = default_irq_host_match;
497 spin_lock_irqsave(&irq_big_lock, flags);
499 /* If it's a legacy controller, check for duplicates and
500 * mark it as allocated (we use irq 0 host pointer for that
502 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
503 if (irq_map[0].host != NULL) {
504 spin_unlock_irqrestore(&irq_big_lock, flags);
505 /* If we are early boot, we can't free the structure,
507 * this will be fixed once slab is made available early
508 * instead of the current cruft
514 irq_map[0].host = host;
517 list_add(&host->link, &irq_hosts);
518 spin_unlock_irqrestore(&irq_big_lock, flags);
520 /* Additional setups per revmap type */
521 switch(revmap_type) {
522 case IRQ_HOST_MAP_LEGACY:
523 /* 0 is always the invalid number for legacy */
525 /* setup us as the host for all legacy interrupts */
526 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
527 irq_map[i].hwirq = i;
529 irq_map[i].host = host;
532 /* Clear norequest flags */
533 get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
535 /* Legacy flags are left to default at this point,
536 * one can then use irq_create_mapping() to
537 * explicitly change them
539 ops->map(host, i, i);
542 case IRQ_HOST_MAP_LINEAR:
543 rmap = (unsigned int *)(host + 1);
544 for (i = 0; i < revmap_arg; i++)
546 host->revmap_data.linear.size = revmap_arg;
548 host->revmap_data.linear.revmap = rmap;
554 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
559 struct irq_host *irq_find_host(struct device_node *node)
561 struct irq_host *h, *found = NULL;
564 /* We might want to match the legacy controller last since
565 * it might potentially be set to match all interrupts in
566 * the absence of a device node. This isn't a problem so far
569 spin_lock_irqsave(&irq_big_lock, flags);
570 list_for_each_entry(h, &irq_hosts, link)
571 if (h->ops->match(h, node)) {
575 spin_unlock_irqrestore(&irq_big_lock, flags);
578 EXPORT_SYMBOL_GPL(irq_find_host);
580 void irq_set_default_host(struct irq_host *host)
582 pr_debug("irq: Default host set to @0x%p\n", host);
584 irq_default_host = host;
587 void irq_set_virq_count(unsigned int count)
589 pr_debug("irq: Trying to set virq count to %d\n", count);
591 BUG_ON(count < NUM_ISA_INTERRUPTS);
593 irq_virq_count = count;
596 static int irq_setup_virq(struct irq_host *host, unsigned int virq,
597 irq_hw_number_t hwirq)
599 /* Clear IRQ_NOREQUEST flag */
600 get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
604 irq_map[virq].hwirq = hwirq;
607 if (host->ops->map(host, virq, hwirq)) {
608 pr_debug("irq: -> mapping failed, freeing\n");
609 irq_free_virt(virq, 1);
616 unsigned int irq_create_direct_mapping(struct irq_host *host)
621 host = irq_default_host;
623 BUG_ON(host == NULL);
624 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
626 virq = irq_alloc_virt(host, 1, 0);
627 if (virq == NO_IRQ) {
628 pr_debug("irq: create_direct virq allocation failed\n");
632 pr_debug("irq: create_direct obtained virq %d\n", virq);
634 if (irq_setup_virq(host, virq, virq))
640 unsigned int irq_create_mapping(struct irq_host *host,
641 irq_hw_number_t hwirq)
643 unsigned int virq, hint;
645 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
647 /* Look for default host if nececssary */
649 host = irq_default_host;
651 printk(KERN_WARNING "irq_create_mapping called for"
652 " NULL host, hwirq=%lx\n", hwirq);
656 pr_debug("irq: -> using host @%p\n", host);
658 /* Check if mapping already exist, if it does, call
659 * host->ops->map() to update the flags
661 virq = irq_find_mapping(host, hwirq);
662 if (virq != NO_IRQ) {
663 if (host->ops->remap)
664 host->ops->remap(host, virq, hwirq);
665 pr_debug("irq: -> existing mapping on virq %d\n", virq);
669 /* Get a virtual interrupt number */
670 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
672 virq = (unsigned int)hwirq;
673 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
677 /* Allocate a virtual interrupt number */
678 hint = hwirq % irq_virq_count;
679 virq = irq_alloc_virt(host, 1, hint);
680 if (virq == NO_IRQ) {
681 pr_debug("irq: -> virq allocation failed\n");
685 pr_debug("irq: -> obtained virq %d\n", virq);
687 if (irq_setup_virq(host, virq, hwirq))
692 EXPORT_SYMBOL_GPL(irq_create_mapping);
694 unsigned int irq_create_of_mapping(struct device_node *controller,
695 u32 *intspec, unsigned int intsize)
697 struct irq_host *host;
698 irq_hw_number_t hwirq;
699 unsigned int type = IRQ_TYPE_NONE;
702 if (controller == NULL)
703 host = irq_default_host;
705 host = irq_find_host(controller);
707 printk(KERN_WARNING "irq: no irq host found for %s !\n",
708 controller->full_name);
712 /* If host has no translation, then we assume interrupt line */
713 if (host->ops->xlate == NULL)
716 if (host->ops->xlate(host, controller, intspec, intsize,
722 virq = irq_create_mapping(host, hwirq);
726 /* Set type if specified and different than the current one */
727 if (type != IRQ_TYPE_NONE &&
728 type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
729 set_irq_type(virq, type);
732 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
734 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
738 if (of_irq_map_one(dev, index, &oirq))
741 return irq_create_of_mapping(oirq.controller, oirq.specifier,
744 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
746 void irq_dispose_mapping(unsigned int virq)
748 struct irq_host *host;
749 irq_hw_number_t hwirq;
754 host = irq_map[virq].host;
755 WARN_ON (host == NULL);
759 /* Never unmap legacy interrupts */
760 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
763 /* remove chip and handler */
764 set_irq_chip_and_handler(virq, NULL, NULL);
766 /* Make sure it's completed */
767 synchronize_irq(virq);
769 /* Tell the PIC about it */
770 if (host->ops->unmap)
771 host->ops->unmap(host, virq);
774 /* Clear reverse map */
775 hwirq = irq_map[virq].hwirq;
776 switch(host->revmap_type) {
777 case IRQ_HOST_MAP_LINEAR:
778 if (hwirq < host->revmap_data.linear.size)
779 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
781 case IRQ_HOST_MAP_TREE:
783 * Check if radix tree allocated yet, if not then nothing to
787 if (revmap_trees_allocated < 1)
789 mutex_lock(&revmap_trees_mutex);
790 radix_tree_delete(&host->revmap_data.tree, hwirq);
791 mutex_unlock(&revmap_trees_mutex);
797 irq_map[virq].hwirq = host->inval_irq;
800 get_irq_desc(virq)->status |= IRQ_NOREQUEST;
803 irq_free_virt(virq, 1);
805 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
807 unsigned int irq_find_mapping(struct irq_host *host,
808 irq_hw_number_t hwirq)
811 unsigned int hint = hwirq % irq_virq_count;
813 /* Look for default host if nececssary */
815 host = irq_default_host;
819 /* legacy -> bail early */
820 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
823 /* Slow path does a linear search of the map */
824 if (hint < NUM_ISA_INTERRUPTS)
825 hint = NUM_ISA_INTERRUPTS;
828 if (irq_map[i].host == host &&
829 irq_map[i].hwirq == hwirq)
832 if (i >= irq_virq_count)
833 i = NUM_ISA_INTERRUPTS;
837 EXPORT_SYMBOL_GPL(irq_find_mapping);
840 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
841 irq_hw_number_t hwirq)
843 struct irq_map_entry *ptr;
846 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
849 * Check if the radix tree exists and has bee initialized.
850 * If not, we fallback to slow mode
852 if (revmap_trees_allocated < 2)
853 return irq_find_mapping(host, hwirq);
855 /* Now try to resolve */
857 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
858 * as it's referencing an entry in the static irq_map table.
860 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
863 * If found in radix tree, then fine.
864 * Else fallback to linear lookup - this should not happen in practice
865 * as it means that we failed to insert the node in the radix tree.
868 virq = ptr - irq_map;
870 virq = irq_find_mapping(host, hwirq);
875 void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
876 irq_hw_number_t hwirq)
879 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
882 * Check if the radix tree exists yet.
883 * If not, then the irq will be inserted into the tree when it gets
887 if (revmap_trees_allocated < 1)
890 if (virq != NO_IRQ) {
891 mutex_lock(&revmap_trees_mutex);
892 radix_tree_insert(&host->revmap_data.tree, hwirq,
894 mutex_unlock(&revmap_trees_mutex);
898 unsigned int irq_linear_revmap(struct irq_host *host,
899 irq_hw_number_t hwirq)
901 unsigned int *revmap;
903 WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
905 /* Check revmap bounds */
906 if (unlikely(hwirq >= host->revmap_data.linear.size))
907 return irq_find_mapping(host, hwirq);
909 /* Check if revmap was allocated */
910 revmap = host->revmap_data.linear.revmap;
911 if (unlikely(revmap == NULL))
912 return irq_find_mapping(host, hwirq);
914 /* Fill up revmap with slow path if no mapping found */
915 if (unlikely(revmap[hwirq] == NO_IRQ))
916 revmap[hwirq] = irq_find_mapping(host, hwirq);
918 return revmap[hwirq];
921 unsigned int irq_alloc_virt(struct irq_host *host,
926 unsigned int i, j, found = NO_IRQ;
928 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
931 spin_lock_irqsave(&irq_big_lock, flags);
933 /* Use hint for 1 interrupt if any */
934 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
935 hint < irq_virq_count && irq_map[hint].host == NULL) {
940 /* Look for count consecutive numbers in the allocatable
943 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
944 if (irq_map[i].host != NULL)
950 found = i - count + 1;
954 if (found == NO_IRQ) {
955 spin_unlock_irqrestore(&irq_big_lock, flags);
959 for (i = found; i < (found + count); i++) {
960 irq_map[i].hwirq = host->inval_irq;
962 irq_map[i].host = host;
964 spin_unlock_irqrestore(&irq_big_lock, flags);
968 void irq_free_virt(unsigned int virq, unsigned int count)
973 WARN_ON (virq < NUM_ISA_INTERRUPTS);
974 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
976 spin_lock_irqsave(&irq_big_lock, flags);
977 for (i = virq; i < (virq + count); i++) {
978 struct irq_host *host;
980 if (i < NUM_ISA_INTERRUPTS ||
981 (virq + count) > irq_virq_count)
984 host = irq_map[i].host;
985 irq_map[i].hwirq = host->inval_irq;
987 irq_map[i].host = NULL;
989 spin_unlock_irqrestore(&irq_big_lock, flags);
992 void irq_early_init(void)
996 for (i = 0; i < NR_IRQS; i++)
997 get_irq_desc(i)->status |= IRQ_NOREQUEST;
1000 /* We need to create the radix trees late */
1001 static int irq_late_init(void)
1007 * No mutual exclusion with respect to accessors of the tree is needed
1008 * here as the synchronization is done via the state variable
1009 * revmap_trees_allocated.
1011 list_for_each_entry(h, &irq_hosts, link) {
1012 if (h->revmap_type == IRQ_HOST_MAP_TREE)
1013 INIT_RADIX_TREE(&h->revmap_data.tree, GFP_KERNEL);
1017 * Make sure the radix trees inits are visible before setting
1021 revmap_trees_allocated = 1;
1024 * Insert the reverse mapping for those interrupts already present
1027 mutex_lock(&revmap_trees_mutex);
1028 for (i = 0; i < irq_virq_count; i++) {
1029 if (irq_map[i].host &&
1030 (irq_map[i].host->revmap_type == IRQ_HOST_MAP_TREE))
1031 radix_tree_insert(&irq_map[i].host->revmap_data.tree,
1032 irq_map[i].hwirq, &irq_map[i]);
1034 mutex_unlock(&revmap_trees_mutex);
1037 * Make sure the radix trees insertions are visible before setting
1041 revmap_trees_allocated = 2;
1045 arch_initcall(irq_late_init);
1047 #ifdef CONFIG_VIRQ_DEBUG
1048 static int virq_debug_show(struct seq_file *m, void *private)
1050 unsigned long flags;
1051 struct irq_desc *desc;
1053 char none[] = "none";
1056 seq_printf(m, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1057 "chip name", "host name");
1059 for (i = 1; i < NR_IRQS; i++) {
1060 desc = get_irq_desc(i);
1061 spin_lock_irqsave(&desc->lock, flags);
1063 if (desc->action && desc->action->handler) {
1064 seq_printf(m, "%5d ", i);
1065 seq_printf(m, "0x%05lx ", virq_to_hw(i));
1067 if (desc->chip && desc->chip->typename)
1068 p = desc->chip->typename;
1071 seq_printf(m, "%-15s ", p);
1073 if (irq_map[i].host && irq_map[i].host->of_node)
1074 p = irq_map[i].host->of_node->full_name;
1077 seq_printf(m, "%s\n", p);
1080 spin_unlock_irqrestore(&desc->lock, flags);
1086 static int virq_debug_open(struct inode *inode, struct file *file)
1088 return single_open(file, virq_debug_show, inode->i_private);
1091 static const struct file_operations virq_debug_fops = {
1092 .open = virq_debug_open,
1094 .llseek = seq_lseek,
1095 .release = single_release,
1098 static int __init irq_debugfs_init(void)
1100 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
1101 NULL, &virq_debug_fops) == NULL)
1106 __initcall(irq_debugfs_init);
1107 #endif /* CONFIG_VIRQ_DEBUG */
1110 static int __init setup_noirqdistrib(char *str)
1112 distribute_irqs = 0;
1116 __setup("noirqdistrib", setup_noirqdistrib);
1117 #endif /* CONFIG_PPC64 */