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(cpumask_t map)
289 struct irq_desc *desc;
296 desc = irq_to_desc(irq);
297 if (desc && desc->status & IRQ_PER_CPU)
300 cpumask_and(&mask, desc->affinity, &map);
301 if (any_online_cpu(mask) == NR_CPUS) {
302 printk("Breaking affinity for irq %i\n", irq);
305 if (desc->chip->set_affinity)
306 desc->chip->set_affinity(irq, &mask);
307 else if (desc->action && !(warned++))
308 printk("Cannot set affinity for irq %i\n", irq);
317 #ifdef CONFIG_IRQSTACKS
318 static inline void handle_one_irq(unsigned int irq)
320 struct thread_info *curtp, *irqtp;
321 unsigned long saved_sp_limit;
322 struct irq_desc *desc;
324 /* Switch to the irq stack to handle this */
325 curtp = current_thread_info();
326 irqtp = hardirq_ctx[smp_processor_id()];
328 if (curtp == irqtp) {
329 /* We're already on the irq stack, just handle it */
330 generic_handle_irq(irq);
334 desc = irq_to_desc(irq);
335 saved_sp_limit = current->thread.ksp_limit;
337 irqtp->task = curtp->task;
340 /* Copy the softirq bits in preempt_count so that the
341 * softirq checks work in the hardirq context. */
342 irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) |
343 (curtp->preempt_count & SOFTIRQ_MASK);
345 current->thread.ksp_limit = (unsigned long)irqtp +
346 _ALIGN_UP(sizeof(struct thread_info), 16);
348 call_handle_irq(irq, desc, irqtp, desc->handle_irq);
349 current->thread.ksp_limit = saved_sp_limit;
352 /* Set any flag that may have been set on the
356 set_bits(irqtp->flags, &curtp->flags);
359 static inline void handle_one_irq(unsigned int irq)
361 generic_handle_irq(irq);
365 static inline void check_stack_overflow(void)
367 #ifdef CONFIG_DEBUG_STACKOVERFLOW
370 sp = __get_SP() & (THREAD_SIZE-1);
372 /* check for stack overflow: is there less than 2KB free? */
373 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
374 printk("do_IRQ: stack overflow: %ld\n",
375 sp - sizeof(struct thread_info));
381 void do_IRQ(struct pt_regs *regs)
383 struct pt_regs *old_regs = set_irq_regs(regs);
386 trace_irq_entry(regs);
390 check_stack_overflow();
392 irq = ppc_md.get_irq();
394 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE)
396 else if (irq != NO_IRQ_IGNORE)
397 __get_cpu_var(irq_stat).spurious_irqs++;
400 set_irq_regs(old_regs);
402 #ifdef CONFIG_PPC_ISERIES
403 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
404 get_lppaca()->int_dword.fields.decr_int) {
405 get_lppaca()->int_dword.fields.decr_int = 0;
406 /* Signal a fake decrementer interrupt */
407 timer_interrupt(regs);
411 trace_irq_exit(regs);
414 void __init init_IRQ(void)
424 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
425 struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
426 struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
427 struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
429 void exc_lvl_ctx_init(void)
431 struct thread_info *tp;
434 for_each_possible_cpu(i) {
435 memset((void *)critirq_ctx[i], 0, THREAD_SIZE);
438 tp->preempt_count = 0;
441 memset((void *)dbgirq_ctx[i], 0, THREAD_SIZE);
444 tp->preempt_count = 0;
446 memset((void *)mcheckirq_ctx[i], 0, THREAD_SIZE);
447 tp = mcheckirq_ctx[i];
449 tp->preempt_count = HARDIRQ_OFFSET;
455 #ifdef CONFIG_IRQSTACKS
456 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
457 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
459 void irq_ctx_init(void)
461 struct thread_info *tp;
464 for_each_possible_cpu(i) {
465 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
468 tp->preempt_count = 0;
470 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
473 tp->preempt_count = HARDIRQ_OFFSET;
477 static inline void do_softirq_onstack(void)
479 struct thread_info *curtp, *irqtp;
480 unsigned long saved_sp_limit = current->thread.ksp_limit;
482 curtp = current_thread_info();
483 irqtp = softirq_ctx[smp_processor_id()];
484 irqtp->task = curtp->task;
485 current->thread.ksp_limit = (unsigned long)irqtp +
486 _ALIGN_UP(sizeof(struct thread_info), 16);
487 call_do_softirq(irqtp);
488 current->thread.ksp_limit = saved_sp_limit;
493 #define do_softirq_onstack() __do_softirq()
494 #endif /* CONFIG_IRQSTACKS */
496 void do_softirq(void)
503 local_irq_save(flags);
505 if (local_softirq_pending())
506 do_softirq_onstack();
508 local_irq_restore(flags);
513 * IRQ controller and virtual interrupts
516 static LIST_HEAD(irq_hosts);
517 static DEFINE_RAW_SPINLOCK(irq_big_lock);
518 static unsigned int revmap_trees_allocated;
519 static DEFINE_MUTEX(revmap_trees_mutex);
520 struct irq_map_entry irq_map[NR_IRQS];
521 static unsigned int irq_virq_count = NR_IRQS;
522 static struct irq_host *irq_default_host;
524 irq_hw_number_t virq_to_hw(unsigned int virq)
526 return irq_map[virq].hwirq;
528 EXPORT_SYMBOL_GPL(virq_to_hw);
530 static int default_irq_host_match(struct irq_host *h, struct device_node *np)
532 return h->of_node != NULL && h->of_node == np;
535 struct irq_host *irq_alloc_host(struct device_node *of_node,
536 unsigned int revmap_type,
537 unsigned int revmap_arg,
538 struct irq_host_ops *ops,
539 irq_hw_number_t inval_irq)
541 struct irq_host *host;
542 unsigned int size = sizeof(struct irq_host);
547 /* Allocate structure and revmap table if using linear mapping */
548 if (revmap_type == IRQ_HOST_MAP_LINEAR)
549 size += revmap_arg * sizeof(unsigned int);
550 host = zalloc_maybe_bootmem(size, GFP_KERNEL);
555 host->revmap_type = revmap_type;
556 host->inval_irq = inval_irq;
558 host->of_node = of_node_get(of_node);
560 if (host->ops->match == NULL)
561 host->ops->match = default_irq_host_match;
563 raw_spin_lock_irqsave(&irq_big_lock, flags);
565 /* If it's a legacy controller, check for duplicates and
566 * mark it as allocated (we use irq 0 host pointer for that
568 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
569 if (irq_map[0].host != NULL) {
570 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
571 /* If we are early boot, we can't free the structure,
573 * this will be fixed once slab is made available early
574 * instead of the current cruft
580 irq_map[0].host = host;
583 list_add(&host->link, &irq_hosts);
584 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
586 /* Additional setups per revmap type */
587 switch(revmap_type) {
588 case IRQ_HOST_MAP_LEGACY:
589 /* 0 is always the invalid number for legacy */
591 /* setup us as the host for all legacy interrupts */
592 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
593 irq_map[i].hwirq = i;
595 irq_map[i].host = host;
598 /* Clear norequest flags */
599 irq_to_desc(i)->status &= ~IRQ_NOREQUEST;
601 /* Legacy flags are left to default at this point,
602 * one can then use irq_create_mapping() to
603 * explicitly change them
605 ops->map(host, i, i);
608 case IRQ_HOST_MAP_LINEAR:
609 rmap = (unsigned int *)(host + 1);
610 for (i = 0; i < revmap_arg; i++)
612 host->revmap_data.linear.size = revmap_arg;
614 host->revmap_data.linear.revmap = rmap;
620 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
625 struct irq_host *irq_find_host(struct device_node *node)
627 struct irq_host *h, *found = NULL;
630 /* We might want to match the legacy controller last since
631 * it might potentially be set to match all interrupts in
632 * the absence of a device node. This isn't a problem so far
635 raw_spin_lock_irqsave(&irq_big_lock, flags);
636 list_for_each_entry(h, &irq_hosts, link)
637 if (h->ops->match(h, node)) {
641 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
644 EXPORT_SYMBOL_GPL(irq_find_host);
646 void irq_set_default_host(struct irq_host *host)
648 pr_debug("irq: Default host set to @0x%p\n", host);
650 irq_default_host = host;
653 void irq_set_virq_count(unsigned int count)
655 pr_debug("irq: Trying to set virq count to %d\n", count);
657 BUG_ON(count < NUM_ISA_INTERRUPTS);
659 irq_virq_count = count;
662 static int irq_setup_virq(struct irq_host *host, unsigned int virq,
663 irq_hw_number_t hwirq)
665 struct irq_desc *desc;
667 desc = irq_to_desc_alloc_node(virq, 0);
669 pr_debug("irq: -> allocating desc failed\n");
673 /* Clear IRQ_NOREQUEST flag */
674 desc->status &= ~IRQ_NOREQUEST;
678 irq_map[virq].hwirq = hwirq;
681 if (host->ops->map(host, virq, hwirq)) {
682 pr_debug("irq: -> mapping failed, freeing\n");
689 irq_free_virt(virq, 1);
693 unsigned int irq_create_direct_mapping(struct irq_host *host)
698 host = irq_default_host;
700 BUG_ON(host == NULL);
701 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
703 virq = irq_alloc_virt(host, 1, 0);
704 if (virq == NO_IRQ) {
705 pr_debug("irq: create_direct virq allocation failed\n");
709 pr_debug("irq: create_direct obtained virq %d\n", virq);
711 if (irq_setup_virq(host, virq, virq))
717 unsigned int irq_create_mapping(struct irq_host *host,
718 irq_hw_number_t hwirq)
720 unsigned int virq, hint;
722 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
724 /* Look for default host if nececssary */
726 host = irq_default_host;
728 printk(KERN_WARNING "irq_create_mapping called for"
729 " NULL host, hwirq=%lx\n", hwirq);
733 pr_debug("irq: -> using host @%p\n", host);
735 /* Check if mapping already exist, if it does, call
736 * host->ops->map() to update the flags
738 virq = irq_find_mapping(host, hwirq);
739 if (virq != NO_IRQ) {
740 if (host->ops->remap)
741 host->ops->remap(host, virq, hwirq);
742 pr_debug("irq: -> existing mapping on virq %d\n", virq);
746 /* Get a virtual interrupt number */
747 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
749 virq = (unsigned int)hwirq;
750 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
754 /* Allocate a virtual interrupt number */
755 hint = hwirq % irq_virq_count;
756 virq = irq_alloc_virt(host, 1, hint);
757 if (virq == NO_IRQ) {
758 pr_debug("irq: -> virq allocation failed\n");
763 if (irq_setup_virq(host, virq, hwirq))
766 printk(KERN_DEBUG "irq: irq %lu on host %s mapped to virtual irq %u\n",
767 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
771 EXPORT_SYMBOL_GPL(irq_create_mapping);
773 unsigned int irq_create_of_mapping(struct device_node *controller,
774 const u32 *intspec, unsigned int intsize)
776 struct irq_host *host;
777 irq_hw_number_t hwirq;
778 unsigned int type = IRQ_TYPE_NONE;
781 if (controller == NULL)
782 host = irq_default_host;
784 host = irq_find_host(controller);
786 printk(KERN_WARNING "irq: no irq host found for %s !\n",
787 controller->full_name);
791 /* If host has no translation, then we assume interrupt line */
792 if (host->ops->xlate == NULL)
795 if (host->ops->xlate(host, controller, intspec, intsize,
801 virq = irq_create_mapping(host, hwirq);
805 /* Set type if specified and different than the current one */
806 if (type != IRQ_TYPE_NONE &&
807 type != (irq_to_desc(virq)->status & IRQF_TRIGGER_MASK))
808 set_irq_type(virq, type);
811 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
813 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
817 if (of_irq_map_one(dev, index, &oirq))
820 return irq_create_of_mapping(oirq.controller, oirq.specifier,
823 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
825 void irq_dispose_mapping(unsigned int virq)
827 struct irq_host *host;
828 irq_hw_number_t hwirq;
833 host = irq_map[virq].host;
834 WARN_ON (host == NULL);
838 /* Never unmap legacy interrupts */
839 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
842 /* remove chip and handler */
843 set_irq_chip_and_handler(virq, NULL, NULL);
845 /* Make sure it's completed */
846 synchronize_irq(virq);
848 /* Tell the PIC about it */
849 if (host->ops->unmap)
850 host->ops->unmap(host, virq);
853 /* Clear reverse map */
854 hwirq = irq_map[virq].hwirq;
855 switch(host->revmap_type) {
856 case IRQ_HOST_MAP_LINEAR:
857 if (hwirq < host->revmap_data.linear.size)
858 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
860 case IRQ_HOST_MAP_TREE:
862 * Check if radix tree allocated yet, if not then nothing to
866 if (revmap_trees_allocated < 1)
868 mutex_lock(&revmap_trees_mutex);
869 radix_tree_delete(&host->revmap_data.tree, hwirq);
870 mutex_unlock(&revmap_trees_mutex);
876 irq_map[virq].hwirq = host->inval_irq;
879 irq_to_desc(virq)->status |= IRQ_NOREQUEST;
882 irq_free_virt(virq, 1);
884 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
886 unsigned int irq_find_mapping(struct irq_host *host,
887 irq_hw_number_t hwirq)
890 unsigned int hint = hwirq % irq_virq_count;
892 /* Look for default host if nececssary */
894 host = irq_default_host;
898 /* legacy -> bail early */
899 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
902 /* Slow path does a linear search of the map */
903 if (hint < NUM_ISA_INTERRUPTS)
904 hint = NUM_ISA_INTERRUPTS;
907 if (irq_map[i].host == host &&
908 irq_map[i].hwirq == hwirq)
911 if (i >= irq_virq_count)
912 i = NUM_ISA_INTERRUPTS;
916 EXPORT_SYMBOL_GPL(irq_find_mapping);
919 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
920 irq_hw_number_t hwirq)
922 struct irq_map_entry *ptr;
925 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
928 * Check if the radix tree exists and has bee initialized.
929 * If not, we fallback to slow mode
931 if (revmap_trees_allocated < 2)
932 return irq_find_mapping(host, hwirq);
934 /* Now try to resolve */
936 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
937 * as it's referencing an entry in the static irq_map table.
939 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
942 * If found in radix tree, then fine.
943 * Else fallback to linear lookup - this should not happen in practice
944 * as it means that we failed to insert the node in the radix tree.
947 virq = ptr - irq_map;
949 virq = irq_find_mapping(host, hwirq);
954 void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
955 irq_hw_number_t hwirq)
958 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
961 * Check if the radix tree exists yet.
962 * If not, then the irq will be inserted into the tree when it gets
966 if (revmap_trees_allocated < 1)
969 if (virq != NO_IRQ) {
970 mutex_lock(&revmap_trees_mutex);
971 radix_tree_insert(&host->revmap_data.tree, hwirq,
973 mutex_unlock(&revmap_trees_mutex);
977 unsigned int irq_linear_revmap(struct irq_host *host,
978 irq_hw_number_t hwirq)
980 unsigned int *revmap;
982 WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
984 /* Check revmap bounds */
985 if (unlikely(hwirq >= host->revmap_data.linear.size))
986 return irq_find_mapping(host, hwirq);
988 /* Check if revmap was allocated */
989 revmap = host->revmap_data.linear.revmap;
990 if (unlikely(revmap == NULL))
991 return irq_find_mapping(host, hwirq);
993 /* Fill up revmap with slow path if no mapping found */
994 if (unlikely(revmap[hwirq] == NO_IRQ))
995 revmap[hwirq] = irq_find_mapping(host, hwirq);
997 return revmap[hwirq];
1000 unsigned int irq_alloc_virt(struct irq_host *host,
1004 unsigned long flags;
1005 unsigned int i, j, found = NO_IRQ;
1007 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
1010 raw_spin_lock_irqsave(&irq_big_lock, flags);
1012 /* Use hint for 1 interrupt if any */
1013 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
1014 hint < irq_virq_count && irq_map[hint].host == NULL) {
1019 /* Look for count consecutive numbers in the allocatable
1020 * (non-legacy) space
1022 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
1023 if (irq_map[i].host != NULL)
1029 found = i - count + 1;
1033 if (found == NO_IRQ) {
1034 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1038 for (i = found; i < (found + count); i++) {
1039 irq_map[i].hwirq = host->inval_irq;
1041 irq_map[i].host = host;
1043 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1047 void irq_free_virt(unsigned int virq, unsigned int count)
1049 unsigned long flags;
1052 WARN_ON (virq < NUM_ISA_INTERRUPTS);
1053 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
1055 raw_spin_lock_irqsave(&irq_big_lock, flags);
1056 for (i = virq; i < (virq + count); i++) {
1057 struct irq_host *host;
1059 if (i < NUM_ISA_INTERRUPTS ||
1060 (virq + count) > irq_virq_count)
1063 host = irq_map[i].host;
1064 irq_map[i].hwirq = host->inval_irq;
1066 irq_map[i].host = NULL;
1068 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1071 int arch_early_irq_init(void)
1073 struct irq_desc *desc;
1076 for (i = 0; i < NR_IRQS; i++) {
1077 desc = irq_to_desc(i);
1079 desc->status |= IRQ_NOREQUEST;
1085 int arch_init_chip_data(struct irq_desc *desc, int node)
1087 desc->status |= IRQ_NOREQUEST;
1091 /* We need to create the radix trees late */
1092 static int irq_late_init(void)
1098 * No mutual exclusion with respect to accessors of the tree is needed
1099 * here as the synchronization is done via the state variable
1100 * revmap_trees_allocated.
1102 list_for_each_entry(h, &irq_hosts, link) {
1103 if (h->revmap_type == IRQ_HOST_MAP_TREE)
1104 INIT_RADIX_TREE(&h->revmap_data.tree, GFP_KERNEL);
1108 * Make sure the radix trees inits are visible before setting
1112 revmap_trees_allocated = 1;
1115 * Insert the reverse mapping for those interrupts already present
1118 mutex_lock(&revmap_trees_mutex);
1119 for (i = 0; i < irq_virq_count; i++) {
1120 if (irq_map[i].host &&
1121 (irq_map[i].host->revmap_type == IRQ_HOST_MAP_TREE))
1122 radix_tree_insert(&irq_map[i].host->revmap_data.tree,
1123 irq_map[i].hwirq, &irq_map[i]);
1125 mutex_unlock(&revmap_trees_mutex);
1128 * Make sure the radix trees insertions are visible before setting
1132 revmap_trees_allocated = 2;
1136 arch_initcall(irq_late_init);
1138 #ifdef CONFIG_VIRQ_DEBUG
1139 static int virq_debug_show(struct seq_file *m, void *private)
1141 unsigned long flags;
1142 struct irq_desc *desc;
1144 char none[] = "none";
1147 seq_printf(m, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1148 "chip name", "host name");
1150 for (i = 1; i < nr_irqs; i++) {
1151 desc = irq_to_desc(i);
1155 raw_spin_lock_irqsave(&desc->lock, flags);
1157 if (desc->action && desc->action->handler) {
1158 seq_printf(m, "%5d ", i);
1159 seq_printf(m, "0x%05lx ", virq_to_hw(i));
1161 if (desc->chip && desc->chip->name)
1162 p = desc->chip->name;
1165 seq_printf(m, "%-15s ", p);
1167 if (irq_map[i].host && irq_map[i].host->of_node)
1168 p = irq_map[i].host->of_node->full_name;
1171 seq_printf(m, "%s\n", p);
1174 raw_spin_unlock_irqrestore(&desc->lock, flags);
1180 static int virq_debug_open(struct inode *inode, struct file *file)
1182 return single_open(file, virq_debug_show, inode->i_private);
1185 static const struct file_operations virq_debug_fops = {
1186 .open = virq_debug_open,
1188 .llseek = seq_lseek,
1189 .release = single_release,
1192 static int __init irq_debugfs_init(void)
1194 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
1195 NULL, &virq_debug_fops) == NULL)
1200 __initcall(irq_debugfs_init);
1201 #endif /* CONFIG_VIRQ_DEBUG */
1204 static int __init setup_noirqdistrib(char *str)
1206 distribute_irqs = 0;
1210 __setup("noirqdistrib", setup_noirqdistrib);
1211 #endif /* CONFIG_PPC64 */