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/export.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 <linux/of_irq.h>
59 #include <asm/uaccess.h>
60 #include <asm/system.h>
62 #include <asm/pgtable.h>
64 #include <asm/cache.h>
66 #include <asm/ptrace.h>
67 #include <asm/machdep.h>
73 #include <asm/firmware.h>
74 #include <asm/lv1call.h>
76 #define CREATE_TRACE_POINTS
77 #include <asm/trace.h>
79 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
80 EXPORT_PER_CPU_SYMBOL(irq_stat);
82 int __irq_offset_value;
85 EXPORT_SYMBOL(__irq_offset_value);
86 atomic_t ppc_n_lost_interrupts;
89 extern int tau_initialized;
90 extern int tau_interrupts(int);
92 #endif /* CONFIG_PPC32 */
96 int distribute_irqs = 1;
98 static inline notrace unsigned long get_irq_happened(void)
100 unsigned long happened;
102 __asm__ __volatile__("lbz %0,%1(13)"
103 : "=r" (happened) : "i" (offsetof(struct paca_struct, irq_happened)));
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 static inline notrace int decrementer_check_overflow(void)
116 u64 now = get_tb_or_rtc();
117 u64 *next_tb = &__get_cpu_var(decrementers_next_tb);
121 return now >= *next_tb;
124 /* This is called whenever we are re-enabling interrupts
125 * and returns either 0 (nothing to do) or 500/900 if there's
126 * either an EE or a DEC to generate.
128 * This is called in two contexts: From arch_local_irq_restore()
129 * before soft-enabling interrupts, and from the exception exit
130 * path when returning from an interrupt from a soft-disabled to
131 * a soft enabled context. In both case we have interrupts hard
134 * We take care of only clearing the bits we handled in the
135 * PACA irq_happened field since we can only re-emit one at a
136 * time and we don't want to "lose" one.
138 notrace unsigned int __check_irq_replay(void)
141 * We use local_paca rather than get_paca() to avoid all
142 * the debug_smp_processor_id() business in this low level
145 unsigned char happened = local_paca->irq_happened;
147 /* Clear bit 0 which we wouldn't clear otherwise */
148 local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
151 * Force the delivery of pending soft-disabled interrupts on PS3.
152 * Any HV call will have this side effect.
154 if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
156 lv1_get_version_info(&tmp, &tmp2);
160 * We may have missed a decrementer interrupt. We check the
161 * decrementer itself rather than the paca irq_happened field
162 * in case we also had a rollover while hard disabled
164 local_paca->irq_happened &= ~PACA_IRQ_DEC;
165 if (decrementer_check_overflow())
168 /* Finally check if an external interrupt happened */
169 local_paca->irq_happened &= ~PACA_IRQ_EE;
170 if (happened & PACA_IRQ_EE)
173 #ifdef CONFIG_PPC_BOOK3E
174 /* Finally check if an EPR external interrupt happened
175 * this bit is typically set if we need to handle another
176 * "edge" interrupt from within the MPIC "EPR" handler
178 local_paca->irq_happened &= ~PACA_IRQ_EE_EDGE;
179 if (happened & PACA_IRQ_EE_EDGE)
182 local_paca->irq_happened &= ~PACA_IRQ_DBELL;
183 if (happened & PACA_IRQ_DBELL)
185 #endif /* CONFIG_PPC_BOOK3E */
187 /* There should be nothing left ! */
188 BUG_ON(local_paca->irq_happened != 0);
193 notrace void arch_local_irq_restore(unsigned long en)
195 unsigned char irq_happened;
198 /* Write the new soft-enabled value */
199 set_soft_enabled(en);
203 * From this point onward, we can take interrupts, preempt,
204 * etc... unless we got hard-disabled. We check if an event
205 * happened. If none happened, we know we can just return.
207 * We may have preempted before the check below, in which case
208 * we are checking the "new" CPU instead of the old one. This
209 * is only a problem if an event happened on the "old" CPU.
211 * External interrupt events on non-iseries will have caused
212 * interrupts to be hard-disabled, so there is no problem, we
213 * cannot have preempted.
215 * That leaves us with EEs on iSeries or decrementer interrupts,
216 * which I decided to safely ignore. The preemption would have
217 * itself been the result of an interrupt, upon which return we
218 * will have checked for pending events on the old CPU.
220 irq_happened = get_irq_happened();
225 * We need to hard disable to get a trusted value from
226 * __check_irq_replay(). We also need to soft-disable
227 * again to avoid warnings in there due to the use of
230 * We know that if the value in irq_happened is exactly 0x01
231 * then we are already hard disabled (there are other less
232 * common cases that we'll ignore for now), so we skip the
233 * (expensive) mtmsrd.
235 if (unlikely(irq_happened != PACA_IRQ_HARD_DIS))
236 __hard_irq_disable();
240 * Check if anything needs to be re-emitted. We haven't
241 * soft-enabled yet to avoid warnings in decrementer_check_overflow
242 * accessing per-cpu variables
244 replay = __check_irq_replay();
246 /* We can soft-enable now */
250 * And replay if we have to. This will return with interrupts
254 __replay_interrupt(replay);
258 /* Finally, let's ensure we are hard enabled */
261 EXPORT_SYMBOL(arch_local_irq_restore);
264 * This is specifically called by assembly code to re-enable interrupts
265 * if they are currently disabled. This is typically called before
266 * schedule() or do_signal() when returning to userspace. We do it
267 * in C to avoid the burden of dealing with lockdep etc...
269 void restore_interrupts(void)
275 #endif /* CONFIG_PPC64 */
277 int arch_show_interrupts(struct seq_file *p, int prec)
281 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
282 if (tau_initialized) {
283 seq_printf(p, "%*s: ", prec, "TAU");
284 for_each_online_cpu(j)
285 seq_printf(p, "%10u ", tau_interrupts(j));
286 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
288 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
290 seq_printf(p, "%*s: ", prec, "LOC");
291 for_each_online_cpu(j)
292 seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs);
293 seq_printf(p, " Local timer interrupts\n");
295 seq_printf(p, "%*s: ", prec, "SPU");
296 for_each_online_cpu(j)
297 seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs);
298 seq_printf(p, " Spurious interrupts\n");
300 seq_printf(p, "%*s: ", prec, "CNT");
301 for_each_online_cpu(j)
302 seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs);
303 seq_printf(p, " Performance monitoring interrupts\n");
305 seq_printf(p, "%*s: ", prec, "MCE");
306 for_each_online_cpu(j)
307 seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
308 seq_printf(p, " Machine check exceptions\n");
316 u64 arch_irq_stat_cpu(unsigned int cpu)
318 u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
320 sum += per_cpu(irq_stat, cpu).pmu_irqs;
321 sum += per_cpu(irq_stat, cpu).mce_exceptions;
322 sum += per_cpu(irq_stat, cpu).spurious_irqs;
327 #ifdef CONFIG_HOTPLUG_CPU
328 void migrate_irqs(void)
330 struct irq_desc *desc;
334 const struct cpumask *map = cpu_online_mask;
336 alloc_cpumask_var(&mask, GFP_KERNEL);
339 struct irq_data *data;
340 struct irq_chip *chip;
342 desc = irq_to_desc(irq);
346 data = irq_desc_get_irq_data(desc);
347 if (irqd_is_per_cpu(data))
350 chip = irq_data_get_irq_chip(data);
352 cpumask_and(mask, data->affinity, map);
353 if (cpumask_any(mask) >= nr_cpu_ids) {
354 printk("Breaking affinity for irq %i\n", irq);
355 cpumask_copy(mask, map);
357 if (chip->irq_set_affinity)
358 chip->irq_set_affinity(data, mask, true);
359 else if (desc->action && !(warned++))
360 printk("Cannot set affinity for irq %i\n", irq);
363 free_cpumask_var(mask);
371 static inline void handle_one_irq(unsigned int irq)
373 struct thread_info *curtp, *irqtp;
374 unsigned long saved_sp_limit;
375 struct irq_desc *desc;
377 desc = irq_to_desc(irq);
381 /* Switch to the irq stack to handle this */
382 curtp = current_thread_info();
383 irqtp = hardirq_ctx[smp_processor_id()];
385 if (curtp == irqtp) {
386 /* We're already on the irq stack, just handle it */
387 desc->handle_irq(irq, desc);
391 saved_sp_limit = current->thread.ksp_limit;
393 irqtp->task = curtp->task;
396 /* Copy the softirq bits in preempt_count so that the
397 * softirq checks work in the hardirq context. */
398 irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) |
399 (curtp->preempt_count & SOFTIRQ_MASK);
401 current->thread.ksp_limit = (unsigned long)irqtp +
402 _ALIGN_UP(sizeof(struct thread_info), 16);
404 call_handle_irq(irq, desc, irqtp, desc->handle_irq);
405 current->thread.ksp_limit = saved_sp_limit;
408 /* Set any flag that may have been set on the
412 set_bits(irqtp->flags, &curtp->flags);
415 static inline void check_stack_overflow(void)
417 #ifdef CONFIG_DEBUG_STACKOVERFLOW
420 sp = __get_SP() & (THREAD_SIZE-1);
422 /* check for stack overflow: is there less than 2KB free? */
423 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
424 printk("do_IRQ: stack overflow: %ld\n",
425 sp - sizeof(struct thread_info));
431 void do_IRQ(struct pt_regs *regs)
433 struct pt_regs *old_regs = set_irq_regs(regs);
436 trace_irq_entry(regs);
440 check_stack_overflow();
443 * Query the platform PIC for the interrupt & ack it.
445 * This will typically lower the interrupt line to the CPU
447 irq = ppc_md.get_irq();
449 /* We can hard enable interrupts now */
450 may_hard_irq_enable();
452 /* And finally process it */
453 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE)
455 else if (irq != NO_IRQ_IGNORE)
456 __get_cpu_var(irq_stat).spurious_irqs++;
459 set_irq_regs(old_regs);
461 #ifdef CONFIG_PPC_ISERIES
462 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
463 get_lppaca()->int_dword.fields.decr_int) {
464 get_lppaca()->int_dword.fields.decr_int = 0;
465 /* Signal a fake decrementer interrupt */
466 timer_interrupt(regs);
470 trace_irq_exit(regs);
473 void __init init_IRQ(void)
483 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
484 struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
485 struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
486 struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
488 void exc_lvl_ctx_init(void)
490 struct thread_info *tp;
493 for_each_possible_cpu(i) {
497 cpu_nr = get_hard_smp_processor_id(i);
499 memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE);
500 tp = critirq_ctx[cpu_nr];
502 tp->preempt_count = 0;
505 memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE);
506 tp = dbgirq_ctx[cpu_nr];
508 tp->preempt_count = 0;
510 memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE);
511 tp = mcheckirq_ctx[cpu_nr];
513 tp->preempt_count = HARDIRQ_OFFSET;
519 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
520 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
522 void irq_ctx_init(void)
524 struct thread_info *tp;
527 for_each_possible_cpu(i) {
528 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
531 tp->preempt_count = 0;
533 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
536 tp->preempt_count = HARDIRQ_OFFSET;
540 static inline void do_softirq_onstack(void)
542 struct thread_info *curtp, *irqtp;
543 unsigned long saved_sp_limit = current->thread.ksp_limit;
545 curtp = current_thread_info();
546 irqtp = softirq_ctx[smp_processor_id()];
547 irqtp->task = curtp->task;
549 current->thread.ksp_limit = (unsigned long)irqtp +
550 _ALIGN_UP(sizeof(struct thread_info), 16);
551 call_do_softirq(irqtp);
552 current->thread.ksp_limit = saved_sp_limit;
555 /* Set any flag that may have been set on the
559 set_bits(irqtp->flags, &curtp->flags);
562 void do_softirq(void)
569 local_irq_save(flags);
571 if (local_softirq_pending())
572 do_softirq_onstack();
574 local_irq_restore(flags);
579 * IRQ controller and virtual interrupts
582 /* The main irq map itself is an array of NR_IRQ entries containing the
583 * associate host and irq number. An entry with a host of NULL is free.
584 * An entry can be allocated if it's free, the allocator always then sets
585 * hwirq first to the host's invalid irq number and then fills ops.
587 struct irq_map_entry {
588 irq_hw_number_t hwirq;
589 struct irq_host *host;
592 static LIST_HEAD(irq_hosts);
593 static DEFINE_RAW_SPINLOCK(irq_big_lock);
594 static DEFINE_MUTEX(revmap_trees_mutex);
595 static struct irq_map_entry irq_map[NR_IRQS];
596 static unsigned int irq_virq_count = NR_IRQS;
597 static struct irq_host *irq_default_host;
599 irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
601 return irq_map[d->irq].hwirq;
603 EXPORT_SYMBOL_GPL(irqd_to_hwirq);
605 irq_hw_number_t virq_to_hw(unsigned int virq)
607 return irq_map[virq].hwirq;
609 EXPORT_SYMBOL_GPL(virq_to_hw);
611 bool virq_is_host(unsigned int virq, struct irq_host *host)
613 return irq_map[virq].host == host;
615 EXPORT_SYMBOL_GPL(virq_is_host);
617 static int default_irq_host_match(struct irq_host *h, struct device_node *np)
619 return h->of_node != NULL && h->of_node == np;
622 struct irq_host *irq_alloc_host(struct device_node *of_node,
623 unsigned int revmap_type,
624 unsigned int revmap_arg,
625 struct irq_host_ops *ops,
626 irq_hw_number_t inval_irq)
628 struct irq_host *host;
629 unsigned int size = sizeof(struct irq_host);
634 /* Allocate structure and revmap table if using linear mapping */
635 if (revmap_type == IRQ_HOST_MAP_LINEAR)
636 size += revmap_arg * sizeof(unsigned int);
637 host = kzalloc(size, GFP_KERNEL);
642 host->revmap_type = revmap_type;
643 host->inval_irq = inval_irq;
645 host->of_node = of_node_get(of_node);
647 if (host->ops->match == NULL)
648 host->ops->match = default_irq_host_match;
650 raw_spin_lock_irqsave(&irq_big_lock, flags);
652 /* If it's a legacy controller, check for duplicates and
653 * mark it as allocated (we use irq 0 host pointer for that
655 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
656 if (irq_map[0].host != NULL) {
657 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
658 of_node_put(host->of_node);
662 irq_map[0].host = host;
665 list_add(&host->link, &irq_hosts);
666 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
668 /* Additional setups per revmap type */
669 switch(revmap_type) {
670 case IRQ_HOST_MAP_LEGACY:
671 /* 0 is always the invalid number for legacy */
673 /* setup us as the host for all legacy interrupts */
674 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
675 irq_map[i].hwirq = i;
677 irq_map[i].host = host;
680 /* Legacy flags are left to default at this point,
681 * one can then use irq_create_mapping() to
682 * explicitly change them
684 ops->map(host, i, i);
686 /* Clear norequest flags */
687 irq_clear_status_flags(i, IRQ_NOREQUEST);
690 case IRQ_HOST_MAP_LINEAR:
691 rmap = (unsigned int *)(host + 1);
692 for (i = 0; i < revmap_arg; i++)
694 host->revmap_data.linear.size = revmap_arg;
696 host->revmap_data.linear.revmap = rmap;
698 case IRQ_HOST_MAP_TREE:
699 INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
705 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
710 struct irq_host *irq_find_host(struct device_node *node)
712 struct irq_host *h, *found = NULL;
715 /* We might want to match the legacy controller last since
716 * it might potentially be set to match all interrupts in
717 * the absence of a device node. This isn't a problem so far
720 raw_spin_lock_irqsave(&irq_big_lock, flags);
721 list_for_each_entry(h, &irq_hosts, link)
722 if (h->ops->match(h, node)) {
726 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
729 EXPORT_SYMBOL_GPL(irq_find_host);
731 void irq_set_default_host(struct irq_host *host)
733 pr_debug("irq: Default host set to @0x%p\n", host);
735 irq_default_host = host;
738 void irq_set_virq_count(unsigned int count)
740 pr_debug("irq: Trying to set virq count to %d\n", count);
742 BUG_ON(count < NUM_ISA_INTERRUPTS);
744 irq_virq_count = count;
747 static int irq_setup_virq(struct irq_host *host, unsigned int virq,
748 irq_hw_number_t hwirq)
752 res = irq_alloc_desc_at(virq, 0);
754 pr_debug("irq: -> allocating desc failed\n");
760 irq_map[virq].hwirq = hwirq;
763 if (host->ops->map(host, virq, hwirq)) {
764 pr_debug("irq: -> mapping failed, freeing\n");
768 irq_clear_status_flags(virq, IRQ_NOREQUEST);
773 irq_free_descs(virq, 1);
775 irq_free_virt(virq, 1);
779 unsigned int irq_create_direct_mapping(struct irq_host *host)
784 host = irq_default_host;
786 BUG_ON(host == NULL);
787 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
789 virq = irq_alloc_virt(host, 1, 0);
790 if (virq == NO_IRQ) {
791 pr_debug("irq: create_direct virq allocation failed\n");
795 pr_debug("irq: create_direct obtained virq %d\n", virq);
797 if (irq_setup_virq(host, virq, virq))
803 unsigned int irq_create_mapping(struct irq_host *host,
804 irq_hw_number_t hwirq)
806 unsigned int virq, hint;
808 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
810 /* Look for default host if nececssary */
812 host = irq_default_host;
814 printk(KERN_WARNING "irq_create_mapping called for"
815 " NULL host, hwirq=%lx\n", hwirq);
819 pr_debug("irq: -> using host @%p\n", host);
821 /* Check if mapping already exists */
822 virq = irq_find_mapping(host, hwirq);
823 if (virq != NO_IRQ) {
824 pr_debug("irq: -> existing mapping on virq %d\n", virq);
828 /* Get a virtual interrupt number */
829 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
831 virq = (unsigned int)hwirq;
832 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
836 /* Allocate a virtual interrupt number */
837 hint = hwirq % irq_virq_count;
838 virq = irq_alloc_virt(host, 1, hint);
839 if (virq == NO_IRQ) {
840 pr_debug("irq: -> virq allocation failed\n");
845 if (irq_setup_virq(host, virq, hwirq))
848 pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",
849 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
853 EXPORT_SYMBOL_GPL(irq_create_mapping);
855 unsigned int irq_create_of_mapping(struct device_node *controller,
856 const u32 *intspec, unsigned int intsize)
858 struct irq_host *host;
859 irq_hw_number_t hwirq;
860 unsigned int type = IRQ_TYPE_NONE;
863 if (controller == NULL)
864 host = irq_default_host;
866 host = irq_find_host(controller);
868 printk(KERN_WARNING "irq: no irq host found for %s !\n",
869 controller->full_name);
873 /* If host has no translation, then we assume interrupt line */
874 if (host->ops->xlate == NULL)
877 if (host->ops->xlate(host, controller, intspec, intsize,
883 virq = irq_create_mapping(host, hwirq);
887 /* Set type if specified and different than the current one */
888 if (type != IRQ_TYPE_NONE &&
889 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
890 irq_set_irq_type(virq, type);
893 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
895 void irq_dispose_mapping(unsigned int virq)
897 struct irq_host *host;
898 irq_hw_number_t hwirq;
903 host = irq_map[virq].host;
904 if (WARN_ON(host == NULL))
907 /* Never unmap legacy interrupts */
908 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
911 irq_set_status_flags(virq, IRQ_NOREQUEST);
913 /* remove chip and handler */
914 irq_set_chip_and_handler(virq, NULL, NULL);
916 /* Make sure it's completed */
917 synchronize_irq(virq);
919 /* Tell the PIC about it */
920 if (host->ops->unmap)
921 host->ops->unmap(host, virq);
924 /* Clear reverse map */
925 hwirq = irq_map[virq].hwirq;
926 switch(host->revmap_type) {
927 case IRQ_HOST_MAP_LINEAR:
928 if (hwirq < host->revmap_data.linear.size)
929 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
931 case IRQ_HOST_MAP_TREE:
932 mutex_lock(&revmap_trees_mutex);
933 radix_tree_delete(&host->revmap_data.tree, hwirq);
934 mutex_unlock(&revmap_trees_mutex);
940 irq_map[virq].hwirq = host->inval_irq;
942 irq_free_descs(virq, 1);
944 irq_free_virt(virq, 1);
946 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
948 unsigned int irq_find_mapping(struct irq_host *host,
949 irq_hw_number_t hwirq)
952 unsigned int hint = hwirq % irq_virq_count;
954 /* Look for default host if nececssary */
956 host = irq_default_host;
960 /* legacy -> bail early */
961 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
964 /* Slow path does a linear search of the map */
965 if (hint < NUM_ISA_INTERRUPTS)
966 hint = NUM_ISA_INTERRUPTS;
969 if (irq_map[i].host == host &&
970 irq_map[i].hwirq == hwirq)
973 if (i >= irq_virq_count)
974 i = NUM_ISA_INTERRUPTS;
978 EXPORT_SYMBOL_GPL(irq_find_mapping);
981 int irq_choose_cpu(const struct cpumask *mask)
985 if (cpumask_equal(mask, cpu_all_mask)) {
986 static int irq_rover;
987 static DEFINE_RAW_SPINLOCK(irq_rover_lock);
990 /* Round-robin distribution... */
992 raw_spin_lock_irqsave(&irq_rover_lock, flags);
994 irq_rover = cpumask_next(irq_rover, cpu_online_mask);
995 if (irq_rover >= nr_cpu_ids)
996 irq_rover = cpumask_first(cpu_online_mask);
1000 raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
1002 cpuid = cpumask_first_and(mask, cpu_online_mask);
1003 if (cpuid >= nr_cpu_ids)
1004 goto do_round_robin;
1007 return get_hard_smp_processor_id(cpuid);
1010 int irq_choose_cpu(const struct cpumask *mask)
1012 return hard_smp_processor_id();
1016 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
1017 irq_hw_number_t hwirq)
1019 struct irq_map_entry *ptr;
1022 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
1023 return irq_find_mapping(host, hwirq);
1026 * The ptr returned references the static global irq_map.
1027 * but freeing an irq can delete nodes along the path to
1028 * do the lookup via call_rcu.
1031 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
1035 * If found in radix tree, then fine.
1036 * Else fallback to linear lookup - this should not happen in practice
1037 * as it means that we failed to insert the node in the radix tree.
1040 virq = ptr - irq_map;
1042 virq = irq_find_mapping(host, hwirq);
1047 void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
1048 irq_hw_number_t hwirq)
1050 if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
1053 if (virq != NO_IRQ) {
1054 mutex_lock(&revmap_trees_mutex);
1055 radix_tree_insert(&host->revmap_data.tree, hwirq,
1057 mutex_unlock(&revmap_trees_mutex);
1061 unsigned int irq_linear_revmap(struct irq_host *host,
1062 irq_hw_number_t hwirq)
1064 unsigned int *revmap;
1066 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
1067 return irq_find_mapping(host, hwirq);
1069 /* Check revmap bounds */
1070 if (unlikely(hwirq >= host->revmap_data.linear.size))
1071 return irq_find_mapping(host, hwirq);
1073 /* Check if revmap was allocated */
1074 revmap = host->revmap_data.linear.revmap;
1075 if (unlikely(revmap == NULL))
1076 return irq_find_mapping(host, hwirq);
1078 /* Fill up revmap with slow path if no mapping found */
1079 if (unlikely(revmap[hwirq] == NO_IRQ))
1080 revmap[hwirq] = irq_find_mapping(host, hwirq);
1082 return revmap[hwirq];
1085 unsigned int irq_alloc_virt(struct irq_host *host,
1089 unsigned long flags;
1090 unsigned int i, j, found = NO_IRQ;
1092 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
1095 raw_spin_lock_irqsave(&irq_big_lock, flags);
1097 /* Use hint for 1 interrupt if any */
1098 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
1099 hint < irq_virq_count && irq_map[hint].host == NULL) {
1104 /* Look for count consecutive numbers in the allocatable
1105 * (non-legacy) space
1107 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
1108 if (irq_map[i].host != NULL)
1114 found = i - count + 1;
1118 if (found == NO_IRQ) {
1119 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1123 for (i = found; i < (found + count); i++) {
1124 irq_map[i].hwirq = host->inval_irq;
1126 irq_map[i].host = host;
1128 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1132 void irq_free_virt(unsigned int virq, unsigned int count)
1134 unsigned long flags;
1137 WARN_ON (virq < NUM_ISA_INTERRUPTS);
1138 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
1140 if (virq < NUM_ISA_INTERRUPTS) {
1141 if (virq + count < NUM_ISA_INTERRUPTS)
1143 count =- NUM_ISA_INTERRUPTS - virq;
1144 virq = NUM_ISA_INTERRUPTS;
1147 if (count > irq_virq_count || virq > irq_virq_count - count) {
1148 if (virq > irq_virq_count)
1150 count = irq_virq_count - virq;
1153 raw_spin_lock_irqsave(&irq_big_lock, flags);
1154 for (i = virq; i < (virq + count); i++) {
1155 struct irq_host *host;
1157 host = irq_map[i].host;
1158 irq_map[i].hwirq = host->inval_irq;
1160 irq_map[i].host = NULL;
1162 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1165 int arch_early_irq_init(void)
1170 #ifdef CONFIG_VIRQ_DEBUG
1171 static int virq_debug_show(struct seq_file *m, void *private)
1173 unsigned long flags;
1174 struct irq_desc *desc;
1176 static const char none[] = "none";
1180 seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
1181 "chip name", "chip data", "host name");
1183 for (i = 1; i < nr_irqs; i++) {
1184 desc = irq_to_desc(i);
1188 raw_spin_lock_irqsave(&desc->lock, flags);
1190 if (desc->action && desc->action->handler) {
1191 struct irq_chip *chip;
1193 seq_printf(m, "%5d ", i);
1194 seq_printf(m, "0x%05lx ", irq_map[i].hwirq);
1196 chip = irq_desc_get_chip(desc);
1197 if (chip && chip->name)
1201 seq_printf(m, "%-15s ", p);
1203 data = irq_desc_get_chip_data(desc);
1204 seq_printf(m, "0x%16p ", data);
1206 if (irq_map[i].host && irq_map[i].host->of_node)
1207 p = irq_map[i].host->of_node->full_name;
1210 seq_printf(m, "%s\n", p);
1213 raw_spin_unlock_irqrestore(&desc->lock, flags);
1219 static int virq_debug_open(struct inode *inode, struct file *file)
1221 return single_open(file, virq_debug_show, inode->i_private);
1224 static const struct file_operations virq_debug_fops = {
1225 .open = virq_debug_open,
1227 .llseek = seq_lseek,
1228 .release = single_release,
1231 static int __init irq_debugfs_init(void)
1233 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
1234 NULL, &virq_debug_fops) == NULL)
1239 __initcall(irq_debugfs_init);
1240 #endif /* CONFIG_VIRQ_DEBUG */
1243 static int __init setup_noirqdistrib(char *str)
1245 distribute_irqs = 0;
1249 __setup("noirqdistrib", setup_noirqdistrib);
1250 #endif /* CONFIG_PPC64 */