2 * Derived from arch/i386/kernel/irq.c
3 * Copyright (C) 1992 Linus Torvalds
4 * Adapted from arch/i386 by Gary Thomas
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Updated and modified by Cort Dougan <cort@fsmlabs.com>
7 * Copyright (C) 1996-2001 Cort Dougan
8 * Adapted for Power Macintosh by Paul Mackerras
9 * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
16 * This file contains the code used by various IRQ handling routines:
17 * asking for different IRQ's should be done through these routines
18 * instead of just grabbing them. Thus setups with different IRQ numbers
19 * shouldn't result in any weird surprises, and installing new handlers
22 * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the
23 * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit
24 * mask register (of which only 16 are defined), hence the weird shifting
25 * and complement of the cached_irq_mask. I want to be able to stuff
26 * this right into the SIU SMASK register.
27 * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
28 * to reduce code space and undefined function references.
33 #include <linux/module.h>
34 #include <linux/threads.h>
35 #include <linux/kernel_stat.h>
36 #include <linux/signal.h>
37 #include <linux/sched.h>
38 #include <linux/ptrace.h>
39 #include <linux/ioport.h>
40 #include <linux/interrupt.h>
41 #include <linux/timex.h>
42 #include <linux/init.h>
43 #include <linux/slab.h>
44 #include <linux/delay.h>
45 #include <linux/irq.h>
46 #include <linux/seq_file.h>
47 #include <linux/cpumask.h>
48 #include <linux/profile.h>
49 #include <linux/bitops.h>
50 #include <linux/list.h>
51 #include <linux/radix-tree.h>
52 #include <linux/mutex.h>
53 #include <linux/bootmem.h>
54 #include <linux/pci.h>
55 #include <linux/debugfs.h>
56 #include <linux/perf_event.h>
58 #include <asm/uaccess.h>
59 #include <asm/system.h>
61 #include <asm/pgtable.h>
63 #include <asm/cache.h>
65 #include <asm/ptrace.h>
66 #include <asm/machdep.h>
70 #include <asm/firmware.h>
71 #include <asm/lv1call.h>
73 #define CREATE_TRACE_POINTS
74 #include <asm/trace.h>
76 int __irq_offset_value;
77 static int ppc_spurious_interrupts;
80 EXPORT_SYMBOL(__irq_offset_value);
81 atomic_t ppc_n_lost_interrupts;
84 extern int tau_initialized;
85 extern int tau_interrupts(int);
87 #endif /* CONFIG_PPC32 */
91 #ifndef CONFIG_SPARSE_IRQ
92 EXPORT_SYMBOL(irq_desc);
95 int distribute_irqs = 1;
97 static inline notrace unsigned long get_hard_enabled(void)
99 unsigned long enabled;
101 __asm__ __volatile__("lbz %0,%1(13)"
102 : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
107 static inline notrace void set_soft_enabled(unsigned long enable)
109 __asm__ __volatile__("stb %0,%1(13)"
110 : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
113 notrace void raw_local_irq_restore(unsigned long en)
116 * get_paca()->soft_enabled = en;
117 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
118 * That was allowed before, and in such a case we do need to take care
119 * that gcc will set soft_enabled directly via r13, not choose to use
120 * an intermediate register, lest we're preempted to a different cpu.
122 set_soft_enabled(en);
126 #ifdef CONFIG_PPC_STD_MMU_64
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();
144 #endif /* CONFIG_PPC_STD_MMU_64 */
146 if (test_perf_event_pending()) {
147 clear_perf_event_pending();
148 perf_event_do_pending();
152 * if (get_paca()->hard_enabled) return;
153 * But again we need to take care that gcc gets hard_enabled directly
154 * via r13, not choose to use an intermediate register, lest we're
155 * preempted to a different cpu in between the two instructions.
157 if (get_hard_enabled())
161 * Need to hard-enable interrupts here. Since currently disabled,
162 * no need to take further asm precautions against preemption; but
163 * use local_paca instead of get_paca() to avoid preemption checking.
165 local_paca->hard_enabled = en;
166 if ((int)mfspr(SPRN_DEC) < 0)
170 * Force the delivery of pending soft-disabled interrupts on PS3.
171 * Any HV call will have this side effect.
173 if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
175 lv1_get_version_info(&tmp);
180 EXPORT_SYMBOL(raw_local_irq_restore);
181 #endif /* CONFIG_PPC64 */
183 int show_interrupts(struct seq_file *p, void *v)
185 int i = *(loff_t *)v, j;
186 struct irqaction *action;
187 struct irq_desc *desc;
192 for_each_online_cpu(j)
193 seq_printf(p, "CPU%d ", j);
195 } else if (i == nr_irqs) {
196 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
197 if (tau_initialized){
198 seq_puts(p, "TAU: ");
199 for_each_online_cpu(j)
200 seq_printf(p, "%10u ", tau_interrupts(j));
201 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
203 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT*/
204 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
209 desc = irq_to_desc(i);
213 raw_spin_lock_irqsave(&desc->lock, flags);
215 action = desc->action;
216 if (!action || !action->handler)
219 seq_printf(p, "%3d: ", i);
221 for_each_online_cpu(j)
222 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
224 seq_printf(p, "%10u ", kstat_irqs(i));
225 #endif /* CONFIG_SMP */
228 seq_printf(p, " %s ", desc->chip->name);
230 seq_puts(p, " None ");
232 seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge ");
233 seq_printf(p, " %s", action->name);
235 for (action = action->next; action; action = action->next)
236 seq_printf(p, ", %s", action->name);
240 raw_spin_unlock_irqrestore(&desc->lock, flags);
245 #ifdef CONFIG_HOTPLUG_CPU
246 void fixup_irqs(cpumask_t map)
248 struct irq_desc *desc;
255 desc = irq_to_desc(irq);
256 if (desc && desc->status & IRQ_PER_CPU)
259 cpumask_and(&mask, desc->affinity, &map);
260 if (any_online_cpu(mask) == NR_CPUS) {
261 printk("Breaking affinity for irq %i\n", irq);
264 if (desc->chip->set_affinity)
265 desc->chip->set_affinity(irq, &mask);
266 else if (desc->action && !(warned++))
267 printk("Cannot set affinity for irq %i\n", irq);
276 #ifdef CONFIG_IRQSTACKS
277 static inline void handle_one_irq(unsigned int irq)
279 struct thread_info *curtp, *irqtp;
280 unsigned long saved_sp_limit;
281 struct irq_desc *desc;
283 /* Switch to the irq stack to handle this */
284 curtp = current_thread_info();
285 irqtp = hardirq_ctx[smp_processor_id()];
287 if (curtp == irqtp) {
288 /* We're already on the irq stack, just handle it */
289 generic_handle_irq(irq);
293 desc = irq_to_desc(irq);
294 saved_sp_limit = current->thread.ksp_limit;
296 irqtp->task = curtp->task;
299 /* Copy the softirq bits in preempt_count so that the
300 * softirq checks work in the hardirq context. */
301 irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) |
302 (curtp->preempt_count & SOFTIRQ_MASK);
304 current->thread.ksp_limit = (unsigned long)irqtp +
305 _ALIGN_UP(sizeof(struct thread_info), 16);
307 call_handle_irq(irq, desc, irqtp, desc->handle_irq);
308 current->thread.ksp_limit = saved_sp_limit;
311 /* Set any flag that may have been set on the
315 set_bits(irqtp->flags, &curtp->flags);
318 static inline void handle_one_irq(unsigned int irq)
320 generic_handle_irq(irq);
324 static inline void check_stack_overflow(void)
326 #ifdef CONFIG_DEBUG_STACKOVERFLOW
329 sp = __get_SP() & (THREAD_SIZE-1);
331 /* check for stack overflow: is there less than 2KB free? */
332 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
333 printk("do_IRQ: stack overflow: %ld\n",
334 sp - sizeof(struct thread_info));
340 void do_IRQ(struct pt_regs *regs)
342 struct pt_regs *old_regs = set_irq_regs(regs);
345 trace_irq_entry(regs);
349 check_stack_overflow();
351 irq = ppc_md.get_irq();
353 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE)
355 else if (irq != NO_IRQ_IGNORE)
356 /* That's not SMP safe ... but who cares ? */
357 ppc_spurious_interrupts++;
360 set_irq_regs(old_regs);
362 #ifdef CONFIG_PPC_ISERIES
363 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
364 get_lppaca()->int_dword.fields.decr_int) {
365 get_lppaca()->int_dword.fields.decr_int = 0;
366 /* Signal a fake decrementer interrupt */
367 timer_interrupt(regs);
371 trace_irq_exit(regs);
374 void __init init_IRQ(void)
384 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
385 struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
386 struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
387 struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
389 void exc_lvl_ctx_init(void)
391 struct thread_info *tp;
394 for_each_possible_cpu(i) {
395 memset((void *)critirq_ctx[i], 0, THREAD_SIZE);
398 tp->preempt_count = 0;
401 memset((void *)dbgirq_ctx[i], 0, THREAD_SIZE);
404 tp->preempt_count = 0;
406 memset((void *)mcheckirq_ctx[i], 0, THREAD_SIZE);
407 tp = mcheckirq_ctx[i];
409 tp->preempt_count = HARDIRQ_OFFSET;
415 #ifdef CONFIG_IRQSTACKS
416 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
417 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
419 void irq_ctx_init(void)
421 struct thread_info *tp;
424 for_each_possible_cpu(i) {
425 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
428 tp->preempt_count = 0;
430 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
433 tp->preempt_count = HARDIRQ_OFFSET;
437 static inline void do_softirq_onstack(void)
439 struct thread_info *curtp, *irqtp;
440 unsigned long saved_sp_limit = current->thread.ksp_limit;
442 curtp = current_thread_info();
443 irqtp = softirq_ctx[smp_processor_id()];
444 irqtp->task = curtp->task;
445 current->thread.ksp_limit = (unsigned long)irqtp +
446 _ALIGN_UP(sizeof(struct thread_info), 16);
447 call_do_softirq(irqtp);
448 current->thread.ksp_limit = saved_sp_limit;
453 #define do_softirq_onstack() __do_softirq()
454 #endif /* CONFIG_IRQSTACKS */
456 void do_softirq(void)
463 local_irq_save(flags);
465 if (local_softirq_pending())
466 do_softirq_onstack();
468 local_irq_restore(flags);
473 * IRQ controller and virtual interrupts
476 static LIST_HEAD(irq_hosts);
477 static DEFINE_SPINLOCK(irq_big_lock);
478 static unsigned int revmap_trees_allocated;
479 static DEFINE_MUTEX(revmap_trees_mutex);
480 struct irq_map_entry irq_map[NR_IRQS];
481 static unsigned int irq_virq_count = NR_IRQS;
482 static struct irq_host *irq_default_host;
484 irq_hw_number_t virq_to_hw(unsigned int virq)
486 return irq_map[virq].hwirq;
488 EXPORT_SYMBOL_GPL(virq_to_hw);
490 static int default_irq_host_match(struct irq_host *h, struct device_node *np)
492 return h->of_node != NULL && h->of_node == np;
495 struct irq_host *irq_alloc_host(struct device_node *of_node,
496 unsigned int revmap_type,
497 unsigned int revmap_arg,
498 struct irq_host_ops *ops,
499 irq_hw_number_t inval_irq)
501 struct irq_host *host;
502 unsigned int size = sizeof(struct irq_host);
507 /* Allocate structure and revmap table if using linear mapping */
508 if (revmap_type == IRQ_HOST_MAP_LINEAR)
509 size += revmap_arg * sizeof(unsigned int);
510 host = zalloc_maybe_bootmem(size, GFP_KERNEL);
515 host->revmap_type = revmap_type;
516 host->inval_irq = inval_irq;
518 host->of_node = of_node_get(of_node);
520 if (host->ops->match == NULL)
521 host->ops->match = default_irq_host_match;
523 spin_lock_irqsave(&irq_big_lock, flags);
525 /* If it's a legacy controller, check for duplicates and
526 * mark it as allocated (we use irq 0 host pointer for that
528 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
529 if (irq_map[0].host != NULL) {
530 spin_unlock_irqrestore(&irq_big_lock, flags);
531 /* If we are early boot, we can't free the structure,
533 * this will be fixed once slab is made available early
534 * instead of the current cruft
540 irq_map[0].host = host;
543 list_add(&host->link, &irq_hosts);
544 spin_unlock_irqrestore(&irq_big_lock, flags);
546 /* Additional setups per revmap type */
547 switch(revmap_type) {
548 case IRQ_HOST_MAP_LEGACY:
549 /* 0 is always the invalid number for legacy */
551 /* setup us as the host for all legacy interrupts */
552 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
553 irq_map[i].hwirq = i;
555 irq_map[i].host = host;
558 /* Clear norequest flags */
559 irq_to_desc(i)->status &= ~IRQ_NOREQUEST;
561 /* Legacy flags are left to default at this point,
562 * one can then use irq_create_mapping() to
563 * explicitly change them
565 ops->map(host, i, i);
568 case IRQ_HOST_MAP_LINEAR:
569 rmap = (unsigned int *)(host + 1);
570 for (i = 0; i < revmap_arg; i++)
572 host->revmap_data.linear.size = revmap_arg;
574 host->revmap_data.linear.revmap = rmap;
580 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
585 struct irq_host *irq_find_host(struct device_node *node)
587 struct irq_host *h, *found = NULL;
590 /* We might want to match the legacy controller last since
591 * it might potentially be set to match all interrupts in
592 * the absence of a device node. This isn't a problem so far
595 spin_lock_irqsave(&irq_big_lock, flags);
596 list_for_each_entry(h, &irq_hosts, link)
597 if (h->ops->match(h, node)) {
601 spin_unlock_irqrestore(&irq_big_lock, flags);
604 EXPORT_SYMBOL_GPL(irq_find_host);
606 void irq_set_default_host(struct irq_host *host)
608 pr_debug("irq: Default host set to @0x%p\n", host);
610 irq_default_host = host;
613 void irq_set_virq_count(unsigned int count)
615 pr_debug("irq: Trying to set virq count to %d\n", count);
617 BUG_ON(count < NUM_ISA_INTERRUPTS);
619 irq_virq_count = count;
622 static int irq_setup_virq(struct irq_host *host, unsigned int virq,
623 irq_hw_number_t hwirq)
625 struct irq_desc *desc;
627 desc = irq_to_desc_alloc_node(virq, 0);
629 pr_debug("irq: -> allocating desc failed\n");
633 /* Clear IRQ_NOREQUEST flag */
634 desc->status &= ~IRQ_NOREQUEST;
638 irq_map[virq].hwirq = hwirq;
641 if (host->ops->map(host, virq, hwirq)) {
642 pr_debug("irq: -> mapping failed, freeing\n");
649 irq_free_virt(virq, 1);
653 unsigned int irq_create_direct_mapping(struct irq_host *host)
658 host = irq_default_host;
660 BUG_ON(host == NULL);
661 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
663 virq = irq_alloc_virt(host, 1, 0);
664 if (virq == NO_IRQ) {
665 pr_debug("irq: create_direct virq allocation failed\n");
669 pr_debug("irq: create_direct obtained virq %d\n", virq);
671 if (irq_setup_virq(host, virq, virq))
677 unsigned int irq_create_mapping(struct irq_host *host,
678 irq_hw_number_t hwirq)
680 unsigned int virq, hint;
682 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
684 /* Look for default host if nececssary */
686 host = irq_default_host;
688 printk(KERN_WARNING "irq_create_mapping called for"
689 " NULL host, hwirq=%lx\n", hwirq);
693 pr_debug("irq: -> using host @%p\n", host);
695 /* Check if mapping already exist, if it does, call
696 * host->ops->map() to update the flags
698 virq = irq_find_mapping(host, hwirq);
699 if (virq != NO_IRQ) {
700 if (host->ops->remap)
701 host->ops->remap(host, virq, hwirq);
702 pr_debug("irq: -> existing mapping on virq %d\n", virq);
706 /* Get a virtual interrupt number */
707 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
709 virq = (unsigned int)hwirq;
710 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
714 /* Allocate a virtual interrupt number */
715 hint = hwirq % irq_virq_count;
716 virq = irq_alloc_virt(host, 1, hint);
717 if (virq == NO_IRQ) {
718 pr_debug("irq: -> virq allocation failed\n");
723 if (irq_setup_virq(host, virq, hwirq))
726 printk(KERN_DEBUG "irq: irq %lu on host %s mapped to virtual irq %u\n",
727 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
731 EXPORT_SYMBOL_GPL(irq_create_mapping);
733 unsigned int irq_create_of_mapping(struct device_node *controller,
734 const u32 *intspec, unsigned int intsize)
736 struct irq_host *host;
737 irq_hw_number_t hwirq;
738 unsigned int type = IRQ_TYPE_NONE;
741 if (controller == NULL)
742 host = irq_default_host;
744 host = irq_find_host(controller);
746 printk(KERN_WARNING "irq: no irq host found for %s !\n",
747 controller->full_name);
751 /* If host has no translation, then we assume interrupt line */
752 if (host->ops->xlate == NULL)
755 if (host->ops->xlate(host, controller, intspec, intsize,
761 virq = irq_create_mapping(host, hwirq);
765 /* Set type if specified and different than the current one */
766 if (type != IRQ_TYPE_NONE &&
767 type != (irq_to_desc(virq)->status & IRQF_TRIGGER_MASK))
768 set_irq_type(virq, type);
771 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
773 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
777 if (of_irq_map_one(dev, index, &oirq))
780 return irq_create_of_mapping(oirq.controller, oirq.specifier,
783 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
785 void irq_dispose_mapping(unsigned int virq)
787 struct irq_host *host;
788 irq_hw_number_t hwirq;
793 host = irq_map[virq].host;
794 WARN_ON (host == NULL);
798 /* Never unmap legacy interrupts */
799 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
802 /* remove chip and handler */
803 set_irq_chip_and_handler(virq, NULL, NULL);
805 /* Make sure it's completed */
806 synchronize_irq(virq);
808 /* Tell the PIC about it */
809 if (host->ops->unmap)
810 host->ops->unmap(host, virq);
813 /* Clear reverse map */
814 hwirq = irq_map[virq].hwirq;
815 switch(host->revmap_type) {
816 case IRQ_HOST_MAP_LINEAR:
817 if (hwirq < host->revmap_data.linear.size)
818 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
820 case IRQ_HOST_MAP_TREE:
822 * Check if radix tree allocated yet, if not then nothing to
826 if (revmap_trees_allocated < 1)
828 mutex_lock(&revmap_trees_mutex);
829 radix_tree_delete(&host->revmap_data.tree, hwirq);
830 mutex_unlock(&revmap_trees_mutex);
836 irq_map[virq].hwirq = host->inval_irq;
839 irq_to_desc(virq)->status |= IRQ_NOREQUEST;
842 irq_free_virt(virq, 1);
844 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
846 unsigned int irq_find_mapping(struct irq_host *host,
847 irq_hw_number_t hwirq)
850 unsigned int hint = hwirq % irq_virq_count;
852 /* Look for default host if nececssary */
854 host = irq_default_host;
858 /* legacy -> bail early */
859 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
862 /* Slow path does a linear search of the map */
863 if (hint < NUM_ISA_INTERRUPTS)
864 hint = NUM_ISA_INTERRUPTS;
867 if (irq_map[i].host == host &&
868 irq_map[i].hwirq == hwirq)
871 if (i >= irq_virq_count)
872 i = NUM_ISA_INTERRUPTS;
876 EXPORT_SYMBOL_GPL(irq_find_mapping);
879 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
880 irq_hw_number_t hwirq)
882 struct irq_map_entry *ptr;
885 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
888 * Check if the radix tree exists and has bee initialized.
889 * If not, we fallback to slow mode
891 if (revmap_trees_allocated < 2)
892 return irq_find_mapping(host, hwirq);
894 /* Now try to resolve */
896 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
897 * as it's referencing an entry in the static irq_map table.
899 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
902 * If found in radix tree, then fine.
903 * Else fallback to linear lookup - this should not happen in practice
904 * as it means that we failed to insert the node in the radix tree.
907 virq = ptr - irq_map;
909 virq = irq_find_mapping(host, hwirq);
914 void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
915 irq_hw_number_t hwirq)
918 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
921 * Check if the radix tree exists yet.
922 * If not, then the irq will be inserted into the tree when it gets
926 if (revmap_trees_allocated < 1)
929 if (virq != NO_IRQ) {
930 mutex_lock(&revmap_trees_mutex);
931 radix_tree_insert(&host->revmap_data.tree, hwirq,
933 mutex_unlock(&revmap_trees_mutex);
937 unsigned int irq_linear_revmap(struct irq_host *host,
938 irq_hw_number_t hwirq)
940 unsigned int *revmap;
942 WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
944 /* Check revmap bounds */
945 if (unlikely(hwirq >= host->revmap_data.linear.size))
946 return irq_find_mapping(host, hwirq);
948 /* Check if revmap was allocated */
949 revmap = host->revmap_data.linear.revmap;
950 if (unlikely(revmap == NULL))
951 return irq_find_mapping(host, hwirq);
953 /* Fill up revmap with slow path if no mapping found */
954 if (unlikely(revmap[hwirq] == NO_IRQ))
955 revmap[hwirq] = irq_find_mapping(host, hwirq);
957 return revmap[hwirq];
960 unsigned int irq_alloc_virt(struct irq_host *host,
965 unsigned int i, j, found = NO_IRQ;
967 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
970 spin_lock_irqsave(&irq_big_lock, flags);
972 /* Use hint for 1 interrupt if any */
973 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
974 hint < irq_virq_count && irq_map[hint].host == NULL) {
979 /* Look for count consecutive numbers in the allocatable
982 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
983 if (irq_map[i].host != NULL)
989 found = i - count + 1;
993 if (found == NO_IRQ) {
994 spin_unlock_irqrestore(&irq_big_lock, flags);
998 for (i = found; i < (found + count); i++) {
999 irq_map[i].hwirq = host->inval_irq;
1001 irq_map[i].host = host;
1003 spin_unlock_irqrestore(&irq_big_lock, flags);
1007 void irq_free_virt(unsigned int virq, unsigned int count)
1009 unsigned long flags;
1012 WARN_ON (virq < NUM_ISA_INTERRUPTS);
1013 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
1015 spin_lock_irqsave(&irq_big_lock, flags);
1016 for (i = virq; i < (virq + count); i++) {
1017 struct irq_host *host;
1019 if (i < NUM_ISA_INTERRUPTS ||
1020 (virq + count) > irq_virq_count)
1023 host = irq_map[i].host;
1024 irq_map[i].hwirq = host->inval_irq;
1026 irq_map[i].host = NULL;
1028 spin_unlock_irqrestore(&irq_big_lock, flags);
1031 int arch_early_irq_init(void)
1033 struct irq_desc *desc;
1036 for (i = 0; i < NR_IRQS; i++) {
1037 desc = irq_to_desc(i);
1039 desc->status |= IRQ_NOREQUEST;
1045 int arch_init_chip_data(struct irq_desc *desc, int node)
1047 desc->status |= IRQ_NOREQUEST;
1051 /* We need to create the radix trees late */
1052 static int irq_late_init(void)
1058 * No mutual exclusion with respect to accessors of the tree is needed
1059 * here as the synchronization is done via the state variable
1060 * revmap_trees_allocated.
1062 list_for_each_entry(h, &irq_hosts, link) {
1063 if (h->revmap_type == IRQ_HOST_MAP_TREE)
1064 INIT_RADIX_TREE(&h->revmap_data.tree, GFP_KERNEL);
1068 * Make sure the radix trees inits are visible before setting
1072 revmap_trees_allocated = 1;
1075 * Insert the reverse mapping for those interrupts already present
1078 mutex_lock(&revmap_trees_mutex);
1079 for (i = 0; i < irq_virq_count; i++) {
1080 if (irq_map[i].host &&
1081 (irq_map[i].host->revmap_type == IRQ_HOST_MAP_TREE))
1082 radix_tree_insert(&irq_map[i].host->revmap_data.tree,
1083 irq_map[i].hwirq, &irq_map[i]);
1085 mutex_unlock(&revmap_trees_mutex);
1088 * Make sure the radix trees insertions are visible before setting
1092 revmap_trees_allocated = 2;
1096 arch_initcall(irq_late_init);
1098 #ifdef CONFIG_VIRQ_DEBUG
1099 static int virq_debug_show(struct seq_file *m, void *private)
1101 unsigned long flags;
1102 struct irq_desc *desc;
1104 char none[] = "none";
1107 seq_printf(m, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1108 "chip name", "host name");
1110 for (i = 1; i < nr_irqs; i++) {
1111 desc = irq_to_desc(i);
1115 raw_spin_lock_irqsave(&desc->lock, flags);
1117 if (desc->action && desc->action->handler) {
1118 seq_printf(m, "%5d ", i);
1119 seq_printf(m, "0x%05lx ", virq_to_hw(i));
1121 if (desc->chip && desc->chip->name)
1122 p = desc->chip->name;
1125 seq_printf(m, "%-15s ", p);
1127 if (irq_map[i].host && irq_map[i].host->of_node)
1128 p = irq_map[i].host->of_node->full_name;
1131 seq_printf(m, "%s\n", p);
1134 raw_spin_unlock_irqrestore(&desc->lock, flags);
1140 static int virq_debug_open(struct inode *inode, struct file *file)
1142 return single_open(file, virq_debug_show, inode->i_private);
1145 static const struct file_operations virq_debug_fops = {
1146 .open = virq_debug_open,
1148 .llseek = seq_lseek,
1149 .release = single_release,
1152 static int __init irq_debugfs_init(void)
1154 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
1155 NULL, &virq_debug_fops) == NULL)
1160 __initcall(irq_debugfs_init);
1161 #endif /* CONFIG_VIRQ_DEBUG */
1164 static int __init setup_noirqdistrib(char *str)
1166 distribute_irqs = 0;
1170 __setup("noirqdistrib", setup_noirqdistrib);
1171 #endif /* CONFIG_PPC64 */