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>
67 #include <asm/dbell.h>
71 #include <asm/firmware.h>
72 #include <asm/lv1call.h>
74 #define CREATE_TRACE_POINTS
75 #include <asm/trace.h>
77 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
78 EXPORT_PER_CPU_SYMBOL(irq_stat);
80 int __irq_offset_value;
83 EXPORT_SYMBOL(__irq_offset_value);
84 atomic_t ppc_n_lost_interrupts;
87 extern int tau_initialized;
88 extern int tau_interrupts(int);
90 #endif /* CONFIG_PPC32 */
94 #ifndef CONFIG_SPARSE_IRQ
95 EXPORT_SYMBOL(irq_desc);
98 int distribute_irqs = 1;
100 static inline notrace unsigned long get_hard_enabled(void)
102 unsigned long enabled;
104 __asm__ __volatile__("lbz %0,%1(13)"
105 : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
110 static inline notrace void set_soft_enabled(unsigned long enable)
112 __asm__ __volatile__("stb %0,%1(13)"
113 : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
116 notrace void raw_local_irq_restore(unsigned long en)
119 * get_paca()->soft_enabled = en;
120 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
121 * That was allowed before, and in such a case we do need to take care
122 * that gcc will set soft_enabled directly via r13, not choose to use
123 * an intermediate register, lest we're preempted to a different cpu.
125 set_soft_enabled(en);
129 #ifdef CONFIG_PPC_STD_MMU_64
130 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
132 * Do we need to disable preemption here? Not really: in the
133 * unlikely event that we're preempted to a different cpu in
134 * between getting r13, loading its lppaca_ptr, and loading
135 * its any_int, we might call iseries_handle_interrupts without
136 * an interrupt pending on the new cpu, but that's no disaster,
137 * is it? And the business of preempting us off the old cpu
138 * would itself involve a local_irq_restore which handles the
139 * interrupt to that cpu.
141 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
142 * to avoid any preemption checking added into get_paca().
144 if (local_paca->lppaca_ptr->int_dword.any_int)
145 iseries_handle_interrupts();
147 #endif /* CONFIG_PPC_STD_MMU_64 */
150 * if (get_paca()->hard_enabled) return;
151 * But again we need to take care that gcc gets hard_enabled directly
152 * via r13, not choose to use an intermediate register, lest we're
153 * preempted to a different cpu in between the two instructions.
155 if (get_hard_enabled())
158 #if defined(CONFIG_BOOKE) && defined(CONFIG_SMP)
159 /* Check for pending doorbell interrupts on SMP */
160 doorbell_exception(NULL);
164 * Need to hard-enable interrupts here. Since currently disabled,
165 * no need to take further asm precautions against preemption; but
166 * use local_paca instead of get_paca() to avoid preemption checking.
168 local_paca->hard_enabled = en;
171 /* On server, re-trigger the decrementer if it went negative since
172 * some processors only trigger on edge transitions of the sign bit.
174 * BookE has a level sensitive decrementer (latches in TSR) so we
177 if ((int)mfspr(SPRN_DEC) < 0)
179 #endif /* CONFIG_BOOKE */
182 * Force the delivery of pending soft-disabled interrupts on PS3.
183 * Any HV call will have this side effect.
185 if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
187 lv1_get_version_info(&tmp);
192 EXPORT_SYMBOL(raw_local_irq_restore);
193 #endif /* CONFIG_PPC64 */
195 static int show_other_interrupts(struct seq_file *p, int prec)
199 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
200 if (tau_initialized) {
201 seq_printf(p, "%*s: ", prec, "TAU");
202 for_each_online_cpu(j)
203 seq_printf(p, "%10u ", tau_interrupts(j));
204 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
206 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
208 seq_printf(p, "%*s: ", prec, "LOC");
209 for_each_online_cpu(j)
210 seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs);
211 seq_printf(p, " Local timer interrupts\n");
213 seq_printf(p, "%*s: ", prec, "SPU");
214 for_each_online_cpu(j)
215 seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs);
216 seq_printf(p, " Spurious interrupts\n");
218 seq_printf(p, "%*s: ", prec, "CNT");
219 for_each_online_cpu(j)
220 seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs);
221 seq_printf(p, " Performance monitoring interrupts\n");
223 seq_printf(p, "%*s: ", prec, "MCE");
224 for_each_online_cpu(j)
225 seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
226 seq_printf(p, " Machine check exceptions\n");
231 int show_interrupts(struct seq_file *p, void *v)
233 unsigned long flags, any_count = 0;
234 int i = *(loff_t *) v, j, prec;
235 struct irqaction *action;
236 struct irq_desc *desc;
241 for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
245 return show_other_interrupts(p, prec);
249 seq_printf(p, "%*s", prec + 8, "");
250 for_each_online_cpu(j)
251 seq_printf(p, "CPU%-8d", j);
255 desc = irq_to_desc(i);
259 raw_spin_lock_irqsave(&desc->lock, flags);
260 for_each_online_cpu(j)
261 any_count |= kstat_irqs_cpu(i, j);
262 action = desc->action;
263 if (!action && !any_count)
266 seq_printf(p, "%*d: ", prec, i);
267 for_each_online_cpu(j)
268 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
271 seq_printf(p, " %-16s", desc->chip->name);
273 seq_printf(p, " %-16s", "None");
274 seq_printf(p, " %-8s", (desc->status & IRQ_LEVEL) ? "Level" : "Edge");
277 seq_printf(p, " %s", action->name);
278 while ((action = action->next) != NULL)
279 seq_printf(p, ", %s", action->name);
284 raw_spin_unlock_irqrestore(&desc->lock, flags);
291 u64 arch_irq_stat_cpu(unsigned int cpu)
293 u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
295 sum += per_cpu(irq_stat, cpu).pmu_irqs;
296 sum += per_cpu(irq_stat, cpu).mce_exceptions;
297 sum += per_cpu(irq_stat, cpu).spurious_irqs;
302 #ifdef CONFIG_HOTPLUG_CPU
303 void fixup_irqs(const struct cpumask *map)
305 struct irq_desc *desc;
310 alloc_cpumask_var(&mask, GFP_KERNEL);
313 desc = irq_to_desc(irq);
317 if (desc->status & IRQ_PER_CPU)
320 cpumask_and(mask, desc->affinity, map);
321 if (cpumask_any(mask) >= nr_cpu_ids) {
322 printk("Breaking affinity for irq %i\n", irq);
323 cpumask_copy(mask, map);
325 if (desc->chip->set_affinity)
326 desc->chip->set_affinity(irq, mask);
327 else if (desc->action && !(warned++))
328 printk("Cannot set affinity for irq %i\n", irq);
331 free_cpumask_var(mask);
339 static inline void handle_one_irq(unsigned int irq)
341 struct thread_info *curtp, *irqtp;
342 unsigned long saved_sp_limit;
343 struct irq_desc *desc;
345 /* Switch to the irq stack to handle this */
346 curtp = current_thread_info();
347 irqtp = hardirq_ctx[smp_processor_id()];
349 if (curtp == irqtp) {
350 /* We're already on the irq stack, just handle it */
351 generic_handle_irq(irq);
355 desc = irq_to_desc(irq);
356 saved_sp_limit = current->thread.ksp_limit;
358 irqtp->task = curtp->task;
361 /* Copy the softirq bits in preempt_count so that the
362 * softirq checks work in the hardirq context. */
363 irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) |
364 (curtp->preempt_count & SOFTIRQ_MASK);
366 current->thread.ksp_limit = (unsigned long)irqtp +
367 _ALIGN_UP(sizeof(struct thread_info), 16);
369 call_handle_irq(irq, desc, irqtp, desc->handle_irq);
370 current->thread.ksp_limit = saved_sp_limit;
373 /* Set any flag that may have been set on the
377 set_bits(irqtp->flags, &curtp->flags);
380 static inline void check_stack_overflow(void)
382 #ifdef CONFIG_DEBUG_STACKOVERFLOW
385 sp = __get_SP() & (THREAD_SIZE-1);
387 /* check for stack overflow: is there less than 2KB free? */
388 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
389 printk("do_IRQ: stack overflow: %ld\n",
390 sp - sizeof(struct thread_info));
396 void do_IRQ(struct pt_regs *regs)
398 struct pt_regs *old_regs = set_irq_regs(regs);
401 trace_irq_entry(regs);
405 check_stack_overflow();
407 irq = ppc_md.get_irq();
409 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE)
411 else if (irq != NO_IRQ_IGNORE)
412 __get_cpu_var(irq_stat).spurious_irqs++;
415 set_irq_regs(old_regs);
417 #ifdef CONFIG_PPC_ISERIES
418 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
419 get_lppaca()->int_dword.fields.decr_int) {
420 get_lppaca()->int_dword.fields.decr_int = 0;
421 /* Signal a fake decrementer interrupt */
422 timer_interrupt(regs);
426 trace_irq_exit(regs);
429 void __init init_IRQ(void)
439 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
440 struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
441 struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
442 struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
444 void exc_lvl_ctx_init(void)
446 struct thread_info *tp;
449 for_each_possible_cpu(i) {
450 memset((void *)critirq_ctx[i], 0, THREAD_SIZE);
453 tp->preempt_count = 0;
456 memset((void *)dbgirq_ctx[i], 0, THREAD_SIZE);
459 tp->preempt_count = 0;
461 memset((void *)mcheckirq_ctx[i], 0, THREAD_SIZE);
462 tp = mcheckirq_ctx[i];
464 tp->preempt_count = HARDIRQ_OFFSET;
470 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
471 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
473 void irq_ctx_init(void)
475 struct thread_info *tp;
478 for_each_possible_cpu(i) {
479 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
482 tp->preempt_count = 0;
484 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
487 tp->preempt_count = HARDIRQ_OFFSET;
491 static inline void do_softirq_onstack(void)
493 struct thread_info *curtp, *irqtp;
494 unsigned long saved_sp_limit = current->thread.ksp_limit;
496 curtp = current_thread_info();
497 irqtp = softirq_ctx[smp_processor_id()];
498 irqtp->task = curtp->task;
499 current->thread.ksp_limit = (unsigned long)irqtp +
500 _ALIGN_UP(sizeof(struct thread_info), 16);
501 call_do_softirq(irqtp);
502 current->thread.ksp_limit = saved_sp_limit;
506 void do_softirq(void)
513 local_irq_save(flags);
515 if (local_softirq_pending())
516 do_softirq_onstack();
518 local_irq_restore(flags);
523 * IRQ controller and virtual interrupts
526 static LIST_HEAD(irq_hosts);
527 static DEFINE_RAW_SPINLOCK(irq_big_lock);
528 static unsigned int revmap_trees_allocated;
529 static DEFINE_MUTEX(revmap_trees_mutex);
530 struct irq_map_entry irq_map[NR_IRQS];
531 static unsigned int irq_virq_count = NR_IRQS;
532 static struct irq_host *irq_default_host;
534 irq_hw_number_t virq_to_hw(unsigned int virq)
536 return irq_map[virq].hwirq;
538 EXPORT_SYMBOL_GPL(virq_to_hw);
540 static int default_irq_host_match(struct irq_host *h, struct device_node *np)
542 return h->of_node != NULL && h->of_node == np;
545 struct irq_host *irq_alloc_host(struct device_node *of_node,
546 unsigned int revmap_type,
547 unsigned int revmap_arg,
548 struct irq_host_ops *ops,
549 irq_hw_number_t inval_irq)
551 struct irq_host *host;
552 unsigned int size = sizeof(struct irq_host);
557 /* Allocate structure and revmap table if using linear mapping */
558 if (revmap_type == IRQ_HOST_MAP_LINEAR)
559 size += revmap_arg * sizeof(unsigned int);
560 host = zalloc_maybe_bootmem(size, GFP_KERNEL);
565 host->revmap_type = revmap_type;
566 host->inval_irq = inval_irq;
568 host->of_node = of_node_get(of_node);
570 if (host->ops->match == NULL)
571 host->ops->match = default_irq_host_match;
573 raw_spin_lock_irqsave(&irq_big_lock, flags);
575 /* If it's a legacy controller, check for duplicates and
576 * mark it as allocated (we use irq 0 host pointer for that
578 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
579 if (irq_map[0].host != NULL) {
580 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
581 /* If we are early boot, we can't free the structure,
583 * this will be fixed once slab is made available early
584 * instead of the current cruft
590 irq_map[0].host = host;
593 list_add(&host->link, &irq_hosts);
594 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
596 /* Additional setups per revmap type */
597 switch(revmap_type) {
598 case IRQ_HOST_MAP_LEGACY:
599 /* 0 is always the invalid number for legacy */
601 /* setup us as the host for all legacy interrupts */
602 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
603 irq_map[i].hwirq = i;
605 irq_map[i].host = host;
608 /* Clear norequest flags */
609 irq_to_desc(i)->status &= ~IRQ_NOREQUEST;
611 /* Legacy flags are left to default at this point,
612 * one can then use irq_create_mapping() to
613 * explicitly change them
615 ops->map(host, i, i);
618 case IRQ_HOST_MAP_LINEAR:
619 rmap = (unsigned int *)(host + 1);
620 for (i = 0; i < revmap_arg; i++)
622 host->revmap_data.linear.size = revmap_arg;
624 host->revmap_data.linear.revmap = rmap;
630 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
635 struct irq_host *irq_find_host(struct device_node *node)
637 struct irq_host *h, *found = NULL;
640 /* We might want to match the legacy controller last since
641 * it might potentially be set to match all interrupts in
642 * the absence of a device node. This isn't a problem so far
645 raw_spin_lock_irqsave(&irq_big_lock, flags);
646 list_for_each_entry(h, &irq_hosts, link)
647 if (h->ops->match(h, node)) {
651 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
654 EXPORT_SYMBOL_GPL(irq_find_host);
656 void irq_set_default_host(struct irq_host *host)
658 pr_debug("irq: Default host set to @0x%p\n", host);
660 irq_default_host = host;
663 void irq_set_virq_count(unsigned int count)
665 pr_debug("irq: Trying to set virq count to %d\n", count);
667 BUG_ON(count < NUM_ISA_INTERRUPTS);
669 irq_virq_count = count;
672 static int irq_setup_virq(struct irq_host *host, unsigned int virq,
673 irq_hw_number_t hwirq)
675 struct irq_desc *desc;
677 desc = irq_to_desc_alloc_node(virq, 0);
679 pr_debug("irq: -> allocating desc failed\n");
683 /* Clear IRQ_NOREQUEST flag */
684 desc->status &= ~IRQ_NOREQUEST;
688 irq_map[virq].hwirq = hwirq;
691 if (host->ops->map(host, virq, hwirq)) {
692 pr_debug("irq: -> mapping failed, freeing\n");
699 irq_free_virt(virq, 1);
703 unsigned int irq_create_direct_mapping(struct irq_host *host)
708 host = irq_default_host;
710 BUG_ON(host == NULL);
711 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
713 virq = irq_alloc_virt(host, 1, 0);
714 if (virq == NO_IRQ) {
715 pr_debug("irq: create_direct virq allocation failed\n");
719 pr_debug("irq: create_direct obtained virq %d\n", virq);
721 if (irq_setup_virq(host, virq, virq))
727 unsigned int irq_create_mapping(struct irq_host *host,
728 irq_hw_number_t hwirq)
730 unsigned int virq, hint;
732 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
734 /* Look for default host if nececssary */
736 host = irq_default_host;
738 printk(KERN_WARNING "irq_create_mapping called for"
739 " NULL host, hwirq=%lx\n", hwirq);
743 pr_debug("irq: -> using host @%p\n", host);
745 /* Check if mapping already exist, if it does, call
746 * host->ops->map() to update the flags
748 virq = irq_find_mapping(host, hwirq);
749 if (virq != NO_IRQ) {
750 if (host->ops->remap)
751 host->ops->remap(host, virq, hwirq);
752 pr_debug("irq: -> existing mapping on virq %d\n", virq);
756 /* Get a virtual interrupt number */
757 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
759 virq = (unsigned int)hwirq;
760 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
764 /* Allocate a virtual interrupt number */
765 hint = hwirq % irq_virq_count;
766 virq = irq_alloc_virt(host, 1, hint);
767 if (virq == NO_IRQ) {
768 pr_debug("irq: -> virq allocation failed\n");
773 if (irq_setup_virq(host, virq, hwirq))
776 printk(KERN_DEBUG "irq: irq %lu on host %s mapped to virtual irq %u\n",
777 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
781 EXPORT_SYMBOL_GPL(irq_create_mapping);
783 unsigned int irq_create_of_mapping(struct device_node *controller,
784 const u32 *intspec, unsigned int intsize)
786 struct irq_host *host;
787 irq_hw_number_t hwirq;
788 unsigned int type = IRQ_TYPE_NONE;
791 if (controller == NULL)
792 host = irq_default_host;
794 host = irq_find_host(controller);
796 printk(KERN_WARNING "irq: no irq host found for %s !\n",
797 controller->full_name);
801 /* If host has no translation, then we assume interrupt line */
802 if (host->ops->xlate == NULL)
805 if (host->ops->xlate(host, controller, intspec, intsize,
811 virq = irq_create_mapping(host, hwirq);
815 /* Set type if specified and different than the current one */
816 if (type != IRQ_TYPE_NONE &&
817 type != (irq_to_desc(virq)->status & IRQF_TRIGGER_MASK))
818 set_irq_type(virq, type);
821 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
823 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
827 if (of_irq_map_one(dev, index, &oirq))
830 return irq_create_of_mapping(oirq.controller, oirq.specifier,
833 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
835 void irq_dispose_mapping(unsigned int virq)
837 struct irq_host *host;
838 irq_hw_number_t hwirq;
843 host = irq_map[virq].host;
844 WARN_ON (host == NULL);
848 /* Never unmap legacy interrupts */
849 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
852 /* remove chip and handler */
853 set_irq_chip_and_handler(virq, NULL, NULL);
855 /* Make sure it's completed */
856 synchronize_irq(virq);
858 /* Tell the PIC about it */
859 if (host->ops->unmap)
860 host->ops->unmap(host, virq);
863 /* Clear reverse map */
864 hwirq = irq_map[virq].hwirq;
865 switch(host->revmap_type) {
866 case IRQ_HOST_MAP_LINEAR:
867 if (hwirq < host->revmap_data.linear.size)
868 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
870 case IRQ_HOST_MAP_TREE:
872 * Check if radix tree allocated yet, if not then nothing to
876 if (revmap_trees_allocated < 1)
878 mutex_lock(&revmap_trees_mutex);
879 radix_tree_delete(&host->revmap_data.tree, hwirq);
880 mutex_unlock(&revmap_trees_mutex);
886 irq_map[virq].hwirq = host->inval_irq;
889 irq_to_desc(virq)->status |= IRQ_NOREQUEST;
892 irq_free_virt(virq, 1);
894 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
896 unsigned int irq_find_mapping(struct irq_host *host,
897 irq_hw_number_t hwirq)
900 unsigned int hint = hwirq % irq_virq_count;
902 /* Look for default host if nececssary */
904 host = irq_default_host;
908 /* legacy -> bail early */
909 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
912 /* Slow path does a linear search of the map */
913 if (hint < NUM_ISA_INTERRUPTS)
914 hint = NUM_ISA_INTERRUPTS;
917 if (irq_map[i].host == host &&
918 irq_map[i].hwirq == hwirq)
921 if (i >= irq_virq_count)
922 i = NUM_ISA_INTERRUPTS;
926 EXPORT_SYMBOL_GPL(irq_find_mapping);
929 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
930 irq_hw_number_t hwirq)
932 struct irq_map_entry *ptr;
935 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
938 * Check if the radix tree exists and has bee initialized.
939 * If not, we fallback to slow mode
941 if (revmap_trees_allocated < 2)
942 return irq_find_mapping(host, hwirq);
944 /* Now try to resolve */
946 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
947 * as it's referencing an entry in the static irq_map table.
949 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
952 * If found in radix tree, then fine.
953 * Else fallback to linear lookup - this should not happen in practice
954 * as it means that we failed to insert the node in the radix tree.
957 virq = ptr - irq_map;
959 virq = irq_find_mapping(host, hwirq);
964 void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
965 irq_hw_number_t hwirq)
968 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
971 * Check if the radix tree exists yet.
972 * If not, then the irq will be inserted into the tree when it gets
976 if (revmap_trees_allocated < 1)
979 if (virq != NO_IRQ) {
980 mutex_lock(&revmap_trees_mutex);
981 radix_tree_insert(&host->revmap_data.tree, hwirq,
983 mutex_unlock(&revmap_trees_mutex);
987 unsigned int irq_linear_revmap(struct irq_host *host,
988 irq_hw_number_t hwirq)
990 unsigned int *revmap;
992 WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
994 /* Check revmap bounds */
995 if (unlikely(hwirq >= host->revmap_data.linear.size))
996 return irq_find_mapping(host, hwirq);
998 /* Check if revmap was allocated */
999 revmap = host->revmap_data.linear.revmap;
1000 if (unlikely(revmap == NULL))
1001 return irq_find_mapping(host, hwirq);
1003 /* Fill up revmap with slow path if no mapping found */
1004 if (unlikely(revmap[hwirq] == NO_IRQ))
1005 revmap[hwirq] = irq_find_mapping(host, hwirq);
1007 return revmap[hwirq];
1010 unsigned int irq_alloc_virt(struct irq_host *host,
1014 unsigned long flags;
1015 unsigned int i, j, found = NO_IRQ;
1017 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
1020 raw_spin_lock_irqsave(&irq_big_lock, flags);
1022 /* Use hint for 1 interrupt if any */
1023 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
1024 hint < irq_virq_count && irq_map[hint].host == NULL) {
1029 /* Look for count consecutive numbers in the allocatable
1030 * (non-legacy) space
1032 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
1033 if (irq_map[i].host != NULL)
1039 found = i - count + 1;
1043 if (found == NO_IRQ) {
1044 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1048 for (i = found; i < (found + count); i++) {
1049 irq_map[i].hwirq = host->inval_irq;
1051 irq_map[i].host = host;
1053 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1057 void irq_free_virt(unsigned int virq, unsigned int count)
1059 unsigned long flags;
1062 WARN_ON (virq < NUM_ISA_INTERRUPTS);
1063 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
1065 raw_spin_lock_irqsave(&irq_big_lock, flags);
1066 for (i = virq; i < (virq + count); i++) {
1067 struct irq_host *host;
1069 if (i < NUM_ISA_INTERRUPTS ||
1070 (virq + count) > irq_virq_count)
1073 host = irq_map[i].host;
1074 irq_map[i].hwirq = host->inval_irq;
1076 irq_map[i].host = NULL;
1078 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1081 int arch_early_irq_init(void)
1083 struct irq_desc *desc;
1086 for (i = 0; i < NR_IRQS; i++) {
1087 desc = irq_to_desc(i);
1089 desc->status |= IRQ_NOREQUEST;
1095 int arch_init_chip_data(struct irq_desc *desc, int node)
1097 desc->status |= IRQ_NOREQUEST;
1101 /* We need to create the radix trees late */
1102 static int irq_late_init(void)
1108 * No mutual exclusion with respect to accessors of the tree is needed
1109 * here as the synchronization is done via the state variable
1110 * revmap_trees_allocated.
1112 list_for_each_entry(h, &irq_hosts, link) {
1113 if (h->revmap_type == IRQ_HOST_MAP_TREE)
1114 INIT_RADIX_TREE(&h->revmap_data.tree, GFP_KERNEL);
1118 * Make sure the radix trees inits are visible before setting
1122 revmap_trees_allocated = 1;
1125 * Insert the reverse mapping for those interrupts already present
1128 mutex_lock(&revmap_trees_mutex);
1129 for (i = 0; i < irq_virq_count; i++) {
1130 if (irq_map[i].host &&
1131 (irq_map[i].host->revmap_type == IRQ_HOST_MAP_TREE))
1132 radix_tree_insert(&irq_map[i].host->revmap_data.tree,
1133 irq_map[i].hwirq, &irq_map[i]);
1135 mutex_unlock(&revmap_trees_mutex);
1138 * Make sure the radix trees insertions are visible before setting
1142 revmap_trees_allocated = 2;
1146 arch_initcall(irq_late_init);
1148 #ifdef CONFIG_VIRQ_DEBUG
1149 static int virq_debug_show(struct seq_file *m, void *private)
1151 unsigned long flags;
1152 struct irq_desc *desc;
1154 char none[] = "none";
1157 seq_printf(m, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1158 "chip name", "host name");
1160 for (i = 1; i < nr_irqs; i++) {
1161 desc = irq_to_desc(i);
1165 raw_spin_lock_irqsave(&desc->lock, flags);
1167 if (desc->action && desc->action->handler) {
1168 seq_printf(m, "%5d ", i);
1169 seq_printf(m, "0x%05lx ", virq_to_hw(i));
1171 if (desc->chip && desc->chip->name)
1172 p = desc->chip->name;
1175 seq_printf(m, "%-15s ", p);
1177 if (irq_map[i].host && irq_map[i].host->of_node)
1178 p = irq_map[i].host->of_node->full_name;
1181 seq_printf(m, "%s\n", p);
1184 raw_spin_unlock_irqrestore(&desc->lock, flags);
1190 static int virq_debug_open(struct inode *inode, struct file *file)
1192 return single_open(file, virq_debug_show, inode->i_private);
1195 static const struct file_operations virq_debug_fops = {
1196 .open = virq_debug_open,
1198 .llseek = seq_lseek,
1199 .release = single_release,
1202 static int __init irq_debugfs_init(void)
1204 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
1205 NULL, &virq_debug_fops) == NULL)
1210 __initcall(irq_debugfs_init);
1211 #endif /* CONFIG_VIRQ_DEBUG */
1214 static int __init setup_noirqdistrib(char *str)
1216 distribute_irqs = 0;
1220 __setup("noirqdistrib", setup_noirqdistrib);
1221 #endif /* CONFIG_PPC64 */