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>
72 #define CREATE_TRACE_POINTS
73 #include <asm/trace.h>
75 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
76 EXPORT_PER_CPU_SYMBOL(irq_stat);
78 int __irq_offset_value;
81 EXPORT_SYMBOL(__irq_offset_value);
82 atomic_t ppc_n_lost_interrupts;
85 extern int tau_initialized;
86 extern int tau_interrupts(int);
88 #endif /* CONFIG_PPC32 */
92 #ifndef CONFIG_SPARSE_IRQ
93 EXPORT_SYMBOL(irq_desc);
96 int distribute_irqs = 1;
98 static inline notrace unsigned long get_hard_enabled(void)
100 unsigned long enabled;
102 __asm__ __volatile__("lbz %0,%1(13)"
103 : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
108 static inline notrace void set_soft_enabled(unsigned long enable)
110 __asm__ __volatile__("stb %0,%1(13)"
111 : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
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 #ifdef CONFIG_PPC_STD_MMU_64
128 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
130 * Do we need to disable preemption here? Not really: in the
131 * unlikely event that we're preempted to a different cpu in
132 * between getting r13, loading its lppaca_ptr, and loading
133 * its any_int, we might call iseries_handle_interrupts without
134 * an interrupt pending on the new cpu, but that's no disaster,
135 * is it? And the business of preempting us off the old cpu
136 * would itself involve a local_irq_restore which handles the
137 * interrupt to that cpu.
139 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
140 * to avoid any preemption checking added into get_paca().
142 if (local_paca->lppaca_ptr->int_dword.any_int)
143 iseries_handle_interrupts();
145 #endif /* CONFIG_PPC_STD_MMU_64 */
148 * if (get_paca()->hard_enabled) return;
149 * But again we need to take care that gcc gets hard_enabled directly
150 * via r13, not choose to use an intermediate register, lest we're
151 * preempted to a different cpu in between the two instructions.
153 if (get_hard_enabled())
157 * Need to hard-enable interrupts here. Since currently disabled,
158 * no need to take further asm precautions against preemption; but
159 * use local_paca instead of get_paca() to avoid preemption checking.
161 local_paca->hard_enabled = en;
162 if ((int)mfspr(SPRN_DEC) < 0)
166 * Force the delivery of pending soft-disabled interrupts on PS3.
167 * Any HV call will have this side effect.
169 if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
171 lv1_get_version_info(&tmp);
176 EXPORT_SYMBOL(raw_local_irq_restore);
177 #endif /* CONFIG_PPC64 */
179 static int show_other_interrupts(struct seq_file *p, int prec)
183 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
184 if (tau_initialized) {
185 seq_printf(p, "%*s: ", prec, "TAU");
186 for_each_online_cpu(j)
187 seq_printf(p, "%10u ", tau_interrupts(j));
188 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
190 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
192 seq_printf(p, "%*s: ", prec, "LOC");
193 for_each_online_cpu(j)
194 seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs);
195 seq_printf(p, " Local timer interrupts\n");
197 seq_printf(p, "%*s: ", prec, "SPU");
198 for_each_online_cpu(j)
199 seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs);
200 seq_printf(p, " Spurious interrupts\n");
202 seq_printf(p, "%*s: ", prec, "CNT");
203 for_each_online_cpu(j)
204 seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs);
205 seq_printf(p, " Performance monitoring interrupts\n");
207 seq_printf(p, "%*s: ", prec, "MCE");
208 for_each_online_cpu(j)
209 seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
210 seq_printf(p, " Machine check exceptions\n");
215 int show_interrupts(struct seq_file *p, void *v)
217 unsigned long flags, any_count = 0;
218 int i = *(loff_t *) v, j, prec;
219 struct irqaction *action;
220 struct irq_desc *desc;
225 for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
229 return show_other_interrupts(p, prec);
233 seq_printf(p, "%*s", prec + 8, "");
234 for_each_online_cpu(j)
235 seq_printf(p, "CPU%-8d", j);
239 desc = irq_to_desc(i);
243 raw_spin_lock_irqsave(&desc->lock, flags);
244 for_each_online_cpu(j)
245 any_count |= kstat_irqs_cpu(i, j);
246 action = desc->action;
247 if (!action && !any_count)
250 seq_printf(p, "%*d: ", prec, i);
251 for_each_online_cpu(j)
252 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
255 seq_printf(p, " %-16s", desc->chip->name);
257 seq_printf(p, " %-16s", "None");
258 seq_printf(p, " %-8s", (desc->status & IRQ_LEVEL) ? "Level" : "Edge");
261 seq_printf(p, " %s", action->name);
262 while ((action = action->next) != NULL)
263 seq_printf(p, ", %s", action->name);
268 raw_spin_unlock_irqrestore(&desc->lock, flags);
275 u64 arch_irq_stat_cpu(unsigned int cpu)
277 u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
279 sum += per_cpu(irq_stat, cpu).pmu_irqs;
280 sum += per_cpu(irq_stat, cpu).mce_exceptions;
281 sum += per_cpu(irq_stat, cpu).spurious_irqs;
286 #ifdef CONFIG_HOTPLUG_CPU
287 void fixup_irqs(const struct cpumask *map)
289 struct irq_desc *desc;
294 alloc_cpumask_var(&mask, GFP_KERNEL);
297 desc = irq_to_desc(irq);
301 if (desc->status & IRQ_PER_CPU)
304 cpumask_and(mask, desc->affinity, map);
305 if (cpumask_any(mask) >= nr_cpu_ids) {
306 printk("Breaking affinity for irq %i\n", irq);
307 cpumask_copy(mask, map);
309 if (desc->chip->set_affinity)
310 desc->chip->set_affinity(irq, mask);
311 else if (desc->action && !(warned++))
312 printk("Cannot set affinity for irq %i\n", irq);
315 free_cpumask_var(mask);
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 check_stack_overflow(void)
366 #ifdef CONFIG_DEBUG_STACKOVERFLOW
369 sp = __get_SP() & (THREAD_SIZE-1);
371 /* check for stack overflow: is there less than 2KB free? */
372 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
373 printk("do_IRQ: stack overflow: %ld\n",
374 sp - sizeof(struct thread_info));
380 void do_IRQ(struct pt_regs *regs)
382 struct pt_regs *old_regs = set_irq_regs(regs);
385 trace_irq_entry(regs);
389 check_stack_overflow();
391 irq = ppc_md.get_irq();
393 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE)
395 else if (irq != NO_IRQ_IGNORE)
396 __get_cpu_var(irq_stat).spurious_irqs++;
399 set_irq_regs(old_regs);
401 #ifdef CONFIG_PPC_ISERIES
402 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
403 get_lppaca()->int_dword.fields.decr_int) {
404 get_lppaca()->int_dword.fields.decr_int = 0;
405 /* Signal a fake decrementer interrupt */
406 timer_interrupt(regs);
410 trace_irq_exit(regs);
413 void __init init_IRQ(void)
423 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
424 struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
425 struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
426 struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
428 void exc_lvl_ctx_init(void)
430 struct thread_info *tp;
433 for_each_possible_cpu(i) {
434 memset((void *)critirq_ctx[i], 0, THREAD_SIZE);
437 tp->preempt_count = 0;
440 memset((void *)dbgirq_ctx[i], 0, THREAD_SIZE);
443 tp->preempt_count = 0;
445 memset((void *)mcheckirq_ctx[i], 0, THREAD_SIZE);
446 tp = mcheckirq_ctx[i];
448 tp->preempt_count = HARDIRQ_OFFSET;
454 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
455 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
457 void irq_ctx_init(void)
459 struct thread_info *tp;
462 for_each_possible_cpu(i) {
463 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
466 tp->preempt_count = 0;
468 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
471 tp->preempt_count = HARDIRQ_OFFSET;
475 static inline void do_softirq_onstack(void)
477 struct thread_info *curtp, *irqtp;
478 unsigned long saved_sp_limit = current->thread.ksp_limit;
480 curtp = current_thread_info();
481 irqtp = softirq_ctx[smp_processor_id()];
482 irqtp->task = curtp->task;
483 current->thread.ksp_limit = (unsigned long)irqtp +
484 _ALIGN_UP(sizeof(struct thread_info), 16);
485 call_do_softirq(irqtp);
486 current->thread.ksp_limit = saved_sp_limit;
490 void do_softirq(void)
497 local_irq_save(flags);
499 if (local_softirq_pending())
500 do_softirq_onstack();
502 local_irq_restore(flags);
507 * IRQ controller and virtual interrupts
510 static LIST_HEAD(irq_hosts);
511 static DEFINE_RAW_SPINLOCK(irq_big_lock);
512 static unsigned int revmap_trees_allocated;
513 static DEFINE_MUTEX(revmap_trees_mutex);
514 struct irq_map_entry irq_map[NR_IRQS];
515 static unsigned int irq_virq_count = NR_IRQS;
516 static struct irq_host *irq_default_host;
518 irq_hw_number_t virq_to_hw(unsigned int virq)
520 return irq_map[virq].hwirq;
522 EXPORT_SYMBOL_GPL(virq_to_hw);
524 static int default_irq_host_match(struct irq_host *h, struct device_node *np)
526 return h->of_node != NULL && h->of_node == np;
529 struct irq_host *irq_alloc_host(struct device_node *of_node,
530 unsigned int revmap_type,
531 unsigned int revmap_arg,
532 struct irq_host_ops *ops,
533 irq_hw_number_t inval_irq)
535 struct irq_host *host;
536 unsigned int size = sizeof(struct irq_host);
541 /* Allocate structure and revmap table if using linear mapping */
542 if (revmap_type == IRQ_HOST_MAP_LINEAR)
543 size += revmap_arg * sizeof(unsigned int);
544 host = zalloc_maybe_bootmem(size, GFP_KERNEL);
549 host->revmap_type = revmap_type;
550 host->inval_irq = inval_irq;
552 host->of_node = of_node_get(of_node);
554 if (host->ops->match == NULL)
555 host->ops->match = default_irq_host_match;
557 raw_spin_lock_irqsave(&irq_big_lock, flags);
559 /* If it's a legacy controller, check for duplicates and
560 * mark it as allocated (we use irq 0 host pointer for that
562 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
563 if (irq_map[0].host != NULL) {
564 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
565 /* If we are early boot, we can't free the structure,
567 * this will be fixed once slab is made available early
568 * instead of the current cruft
574 irq_map[0].host = host;
577 list_add(&host->link, &irq_hosts);
578 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
580 /* Additional setups per revmap type */
581 switch(revmap_type) {
582 case IRQ_HOST_MAP_LEGACY:
583 /* 0 is always the invalid number for legacy */
585 /* setup us as the host for all legacy interrupts */
586 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
587 irq_map[i].hwirq = i;
589 irq_map[i].host = host;
592 /* Clear norequest flags */
593 irq_to_desc(i)->status &= ~IRQ_NOREQUEST;
595 /* Legacy flags are left to default at this point,
596 * one can then use irq_create_mapping() to
597 * explicitly change them
599 ops->map(host, i, i);
602 case IRQ_HOST_MAP_LINEAR:
603 rmap = (unsigned int *)(host + 1);
604 for (i = 0; i < revmap_arg; i++)
606 host->revmap_data.linear.size = revmap_arg;
608 host->revmap_data.linear.revmap = rmap;
614 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
619 struct irq_host *irq_find_host(struct device_node *node)
621 struct irq_host *h, *found = NULL;
624 /* We might want to match the legacy controller last since
625 * it might potentially be set to match all interrupts in
626 * the absence of a device node. This isn't a problem so far
629 raw_spin_lock_irqsave(&irq_big_lock, flags);
630 list_for_each_entry(h, &irq_hosts, link)
631 if (h->ops->match(h, node)) {
635 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
638 EXPORT_SYMBOL_GPL(irq_find_host);
640 void irq_set_default_host(struct irq_host *host)
642 pr_debug("irq: Default host set to @0x%p\n", host);
644 irq_default_host = host;
647 void irq_set_virq_count(unsigned int count)
649 pr_debug("irq: Trying to set virq count to %d\n", count);
651 BUG_ON(count < NUM_ISA_INTERRUPTS);
653 irq_virq_count = count;
656 static int irq_setup_virq(struct irq_host *host, unsigned int virq,
657 irq_hw_number_t hwirq)
659 struct irq_desc *desc;
661 desc = irq_to_desc_alloc_node(virq, 0);
663 pr_debug("irq: -> allocating desc failed\n");
667 /* Clear IRQ_NOREQUEST flag */
668 desc->status &= ~IRQ_NOREQUEST;
672 irq_map[virq].hwirq = hwirq;
675 if (host->ops->map(host, virq, hwirq)) {
676 pr_debug("irq: -> mapping failed, freeing\n");
683 irq_free_virt(virq, 1);
687 unsigned int irq_create_direct_mapping(struct irq_host *host)
692 host = irq_default_host;
694 BUG_ON(host == NULL);
695 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
697 virq = irq_alloc_virt(host, 1, 0);
698 if (virq == NO_IRQ) {
699 pr_debug("irq: create_direct virq allocation failed\n");
703 pr_debug("irq: create_direct obtained virq %d\n", virq);
705 if (irq_setup_virq(host, virq, virq))
711 unsigned int irq_create_mapping(struct irq_host *host,
712 irq_hw_number_t hwirq)
714 unsigned int virq, hint;
716 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
718 /* Look for default host if nececssary */
720 host = irq_default_host;
722 printk(KERN_WARNING "irq_create_mapping called for"
723 " NULL host, hwirq=%lx\n", hwirq);
727 pr_debug("irq: -> using host @%p\n", host);
729 /* Check if mapping already exist, if it does, call
730 * host->ops->map() to update the flags
732 virq = irq_find_mapping(host, hwirq);
733 if (virq != NO_IRQ) {
734 if (host->ops->remap)
735 host->ops->remap(host, virq, hwirq);
736 pr_debug("irq: -> existing mapping on virq %d\n", virq);
740 /* Get a virtual interrupt number */
741 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
743 virq = (unsigned int)hwirq;
744 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
748 /* Allocate a virtual interrupt number */
749 hint = hwirq % irq_virq_count;
750 virq = irq_alloc_virt(host, 1, hint);
751 if (virq == NO_IRQ) {
752 pr_debug("irq: -> virq allocation failed\n");
757 if (irq_setup_virq(host, virq, hwirq))
760 printk(KERN_DEBUG "irq: irq %lu on host %s mapped to virtual irq %u\n",
761 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
765 EXPORT_SYMBOL_GPL(irq_create_mapping);
767 unsigned int irq_create_of_mapping(struct device_node *controller,
768 const u32 *intspec, unsigned int intsize)
770 struct irq_host *host;
771 irq_hw_number_t hwirq;
772 unsigned int type = IRQ_TYPE_NONE;
775 if (controller == NULL)
776 host = irq_default_host;
778 host = irq_find_host(controller);
780 printk(KERN_WARNING "irq: no irq host found for %s !\n",
781 controller->full_name);
785 /* If host has no translation, then we assume interrupt line */
786 if (host->ops->xlate == NULL)
789 if (host->ops->xlate(host, controller, intspec, intsize,
795 virq = irq_create_mapping(host, hwirq);
799 /* Set type if specified and different than the current one */
800 if (type != IRQ_TYPE_NONE &&
801 type != (irq_to_desc(virq)->status & IRQF_TRIGGER_MASK))
802 set_irq_type(virq, type);
805 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
807 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
811 if (of_irq_map_one(dev, index, &oirq))
814 return irq_create_of_mapping(oirq.controller, oirq.specifier,
817 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
819 void irq_dispose_mapping(unsigned int virq)
821 struct irq_host *host;
822 irq_hw_number_t hwirq;
827 host = irq_map[virq].host;
828 WARN_ON (host == NULL);
832 /* Never unmap legacy interrupts */
833 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
836 /* remove chip and handler */
837 set_irq_chip_and_handler(virq, NULL, NULL);
839 /* Make sure it's completed */
840 synchronize_irq(virq);
842 /* Tell the PIC about it */
843 if (host->ops->unmap)
844 host->ops->unmap(host, virq);
847 /* Clear reverse map */
848 hwirq = irq_map[virq].hwirq;
849 switch(host->revmap_type) {
850 case IRQ_HOST_MAP_LINEAR:
851 if (hwirq < host->revmap_data.linear.size)
852 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
854 case IRQ_HOST_MAP_TREE:
856 * Check if radix tree allocated yet, if not then nothing to
860 if (revmap_trees_allocated < 1)
862 mutex_lock(&revmap_trees_mutex);
863 radix_tree_delete(&host->revmap_data.tree, hwirq);
864 mutex_unlock(&revmap_trees_mutex);
870 irq_map[virq].hwirq = host->inval_irq;
873 irq_to_desc(virq)->status |= IRQ_NOREQUEST;
876 irq_free_virt(virq, 1);
878 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
880 unsigned int irq_find_mapping(struct irq_host *host,
881 irq_hw_number_t hwirq)
884 unsigned int hint = hwirq % irq_virq_count;
886 /* Look for default host if nececssary */
888 host = irq_default_host;
892 /* legacy -> bail early */
893 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
896 /* Slow path does a linear search of the map */
897 if (hint < NUM_ISA_INTERRUPTS)
898 hint = NUM_ISA_INTERRUPTS;
901 if (irq_map[i].host == host &&
902 irq_map[i].hwirq == hwirq)
905 if (i >= irq_virq_count)
906 i = NUM_ISA_INTERRUPTS;
910 EXPORT_SYMBOL_GPL(irq_find_mapping);
913 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
914 irq_hw_number_t hwirq)
916 struct irq_map_entry *ptr;
919 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
922 * Check if the radix tree exists and has bee initialized.
923 * If not, we fallback to slow mode
925 if (revmap_trees_allocated < 2)
926 return irq_find_mapping(host, hwirq);
928 /* Now try to resolve */
930 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
931 * as it's referencing an entry in the static irq_map table.
933 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
936 * If found in radix tree, then fine.
937 * Else fallback to linear lookup - this should not happen in practice
938 * as it means that we failed to insert the node in the radix tree.
941 virq = ptr - irq_map;
943 virq = irq_find_mapping(host, hwirq);
948 void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
949 irq_hw_number_t hwirq)
952 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
955 * Check if the radix tree exists yet.
956 * If not, then the irq will be inserted into the tree when it gets
960 if (revmap_trees_allocated < 1)
963 if (virq != NO_IRQ) {
964 mutex_lock(&revmap_trees_mutex);
965 radix_tree_insert(&host->revmap_data.tree, hwirq,
967 mutex_unlock(&revmap_trees_mutex);
971 unsigned int irq_linear_revmap(struct irq_host *host,
972 irq_hw_number_t hwirq)
974 unsigned int *revmap;
976 WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
978 /* Check revmap bounds */
979 if (unlikely(hwirq >= host->revmap_data.linear.size))
980 return irq_find_mapping(host, hwirq);
982 /* Check if revmap was allocated */
983 revmap = host->revmap_data.linear.revmap;
984 if (unlikely(revmap == NULL))
985 return irq_find_mapping(host, hwirq);
987 /* Fill up revmap with slow path if no mapping found */
988 if (unlikely(revmap[hwirq] == NO_IRQ))
989 revmap[hwirq] = irq_find_mapping(host, hwirq);
991 return revmap[hwirq];
994 unsigned int irq_alloc_virt(struct irq_host *host,
999 unsigned int i, j, found = NO_IRQ;
1001 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
1004 raw_spin_lock_irqsave(&irq_big_lock, flags);
1006 /* Use hint for 1 interrupt if any */
1007 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
1008 hint < irq_virq_count && irq_map[hint].host == NULL) {
1013 /* Look for count consecutive numbers in the allocatable
1014 * (non-legacy) space
1016 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
1017 if (irq_map[i].host != NULL)
1023 found = i - count + 1;
1027 if (found == NO_IRQ) {
1028 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1032 for (i = found; i < (found + count); i++) {
1033 irq_map[i].hwirq = host->inval_irq;
1035 irq_map[i].host = host;
1037 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1041 void irq_free_virt(unsigned int virq, unsigned int count)
1043 unsigned long flags;
1046 WARN_ON (virq < NUM_ISA_INTERRUPTS);
1047 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
1049 raw_spin_lock_irqsave(&irq_big_lock, flags);
1050 for (i = virq; i < (virq + count); i++) {
1051 struct irq_host *host;
1053 if (i < NUM_ISA_INTERRUPTS ||
1054 (virq + count) > irq_virq_count)
1057 host = irq_map[i].host;
1058 irq_map[i].hwirq = host->inval_irq;
1060 irq_map[i].host = NULL;
1062 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1065 int arch_early_irq_init(void)
1067 struct irq_desc *desc;
1070 for (i = 0; i < NR_IRQS; i++) {
1071 desc = irq_to_desc(i);
1073 desc->status |= IRQ_NOREQUEST;
1079 int arch_init_chip_data(struct irq_desc *desc, int node)
1081 desc->status |= IRQ_NOREQUEST;
1085 /* We need to create the radix trees late */
1086 static int irq_late_init(void)
1092 * No mutual exclusion with respect to accessors of the tree is needed
1093 * here as the synchronization is done via the state variable
1094 * revmap_trees_allocated.
1096 list_for_each_entry(h, &irq_hosts, link) {
1097 if (h->revmap_type == IRQ_HOST_MAP_TREE)
1098 INIT_RADIX_TREE(&h->revmap_data.tree, GFP_KERNEL);
1102 * Make sure the radix trees inits are visible before setting
1106 revmap_trees_allocated = 1;
1109 * Insert the reverse mapping for those interrupts already present
1112 mutex_lock(&revmap_trees_mutex);
1113 for (i = 0; i < irq_virq_count; i++) {
1114 if (irq_map[i].host &&
1115 (irq_map[i].host->revmap_type == IRQ_HOST_MAP_TREE))
1116 radix_tree_insert(&irq_map[i].host->revmap_data.tree,
1117 irq_map[i].hwirq, &irq_map[i]);
1119 mutex_unlock(&revmap_trees_mutex);
1122 * Make sure the radix trees insertions are visible before setting
1126 revmap_trees_allocated = 2;
1130 arch_initcall(irq_late_init);
1132 #ifdef CONFIG_VIRQ_DEBUG
1133 static int virq_debug_show(struct seq_file *m, void *private)
1135 unsigned long flags;
1136 struct irq_desc *desc;
1138 char none[] = "none";
1141 seq_printf(m, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1142 "chip name", "host name");
1144 for (i = 1; i < nr_irqs; i++) {
1145 desc = irq_to_desc(i);
1149 raw_spin_lock_irqsave(&desc->lock, flags);
1151 if (desc->action && desc->action->handler) {
1152 seq_printf(m, "%5d ", i);
1153 seq_printf(m, "0x%05lx ", virq_to_hw(i));
1155 if (desc->chip && desc->chip->name)
1156 p = desc->chip->name;
1159 seq_printf(m, "%-15s ", p);
1161 if (irq_map[i].host && irq_map[i].host->of_node)
1162 p = irq_map[i].host->of_node->full_name;
1165 seq_printf(m, "%s\n", p);
1168 raw_spin_unlock_irqrestore(&desc->lock, flags);
1174 static int virq_debug_open(struct inode *inode, struct file *file)
1176 return single_open(file, virq_debug_show, inode->i_private);
1179 static const struct file_operations virq_debug_fops = {
1180 .open = virq_debug_open,
1182 .llseek = seq_lseek,
1183 .release = single_release,
1186 static int __init irq_debugfs_init(void)
1188 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
1189 NULL, &virq_debug_fops) == NULL)
1194 __initcall(irq_debugfs_init);
1195 #endif /* CONFIG_VIRQ_DEBUG */
1198 static int __init setup_noirqdistrib(char *str)
1200 distribute_irqs = 0;
1204 __setup("noirqdistrib", setup_noirqdistrib);
1205 #endif /* CONFIG_PPC64 */