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 <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 #ifndef CONFIG_SPARSE_IRQ
97 EXPORT_SYMBOL(irq_desc);
100 int distribute_irqs = 1;
102 static inline notrace unsigned long get_hard_enabled(void)
104 unsigned long enabled;
106 __asm__ __volatile__("lbz %0,%1(13)"
107 : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
112 static inline notrace void set_soft_enabled(unsigned long enable)
114 __asm__ __volatile__("stb %0,%1(13)"
115 : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
118 notrace void arch_local_irq_restore(unsigned long en)
121 * get_paca()->soft_enabled = en;
122 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
123 * That was allowed before, and in such a case we do need to take care
124 * that gcc will set soft_enabled directly via r13, not choose to use
125 * an intermediate register, lest we're preempted to a different cpu.
127 set_soft_enabled(en);
131 #ifdef CONFIG_PPC_STD_MMU_64
132 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
134 * Do we need to disable preemption here? Not really: in the
135 * unlikely event that we're preempted to a different cpu in
136 * between getting r13, loading its lppaca_ptr, and loading
137 * its any_int, we might call iseries_handle_interrupts without
138 * an interrupt pending on the new cpu, but that's no disaster,
139 * is it? And the business of preempting us off the old cpu
140 * would itself involve a local_irq_restore which handles the
141 * interrupt to that cpu.
143 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
144 * to avoid any preemption checking added into get_paca().
146 if (local_paca->lppaca_ptr->int_dword.any_int)
147 iseries_handle_interrupts();
149 #endif /* CONFIG_PPC_STD_MMU_64 */
152 * if (get_paca()->hard_enabled) return;
153 * But again we need to take care that gcc gets hard_enabled directly
154 * via r13, not choose to use an intermediate register, lest we're
155 * preempted to a different cpu in between the two instructions.
157 if (get_hard_enabled())
161 * Need to hard-enable interrupts here. Since currently disabled,
162 * no need to take further asm precautions against preemption; but
163 * use local_paca instead of get_paca() to avoid preemption checking.
165 local_paca->hard_enabled = en;
168 /* On server, re-trigger the decrementer if it went negative since
169 * some processors only trigger on edge transitions of the sign bit.
171 * BookE has a level sensitive decrementer (latches in TSR) so we
174 if ((int)mfspr(SPRN_DEC) < 0)
176 #endif /* CONFIG_BOOKE */
179 * Force the delivery of pending soft-disabled interrupts on PS3.
180 * Any HV call will have this side effect.
182 if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
184 lv1_get_version_info(&tmp);
189 EXPORT_SYMBOL(arch_local_irq_restore);
190 #endif /* CONFIG_PPC64 */
192 int arch_show_interrupts(struct seq_file *p, int prec)
196 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
197 if (tau_initialized) {
198 seq_printf(p, "%*s: ", prec, "TAU");
199 for_each_online_cpu(j)
200 seq_printf(p, "%10u ", tau_interrupts(j));
201 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
203 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
205 seq_printf(p, "%*s: ", prec, "LOC");
206 for_each_online_cpu(j)
207 seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs);
208 seq_printf(p, " Local timer interrupts\n");
210 seq_printf(p, "%*s: ", prec, "SPU");
211 for_each_online_cpu(j)
212 seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs);
213 seq_printf(p, " Spurious interrupts\n");
215 seq_printf(p, "%*s: ", prec, "CNT");
216 for_each_online_cpu(j)
217 seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs);
218 seq_printf(p, " Performance monitoring interrupts\n");
220 seq_printf(p, "%*s: ", prec, "MCE");
221 for_each_online_cpu(j)
222 seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
223 seq_printf(p, " Machine check exceptions\n");
231 u64 arch_irq_stat_cpu(unsigned int cpu)
233 u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
235 sum += per_cpu(irq_stat, cpu).pmu_irqs;
236 sum += per_cpu(irq_stat, cpu).mce_exceptions;
237 sum += per_cpu(irq_stat, cpu).spurious_irqs;
242 #ifdef CONFIG_HOTPLUG_CPU
243 void migrate_irqs(void)
245 struct irq_desc *desc;
249 const struct cpumask *map = cpu_online_mask;
251 alloc_cpumask_var(&mask, GFP_KERNEL);
254 struct irq_data *data;
255 struct irq_chip *chip;
257 desc = irq_to_desc(irq);
261 data = irq_desc_get_irq_data(desc);
262 if (irqd_is_per_cpu(data))
265 chip = irq_data_get_irq_chip(data);
267 cpumask_and(mask, data->affinity, map);
268 if (cpumask_any(mask) >= nr_cpu_ids) {
269 printk("Breaking affinity for irq %i\n", irq);
270 cpumask_copy(mask, map);
272 if (chip->irq_set_affinity)
273 chip->irq_set_affinity(data, mask, true);
274 else if (desc->action && !(warned++))
275 printk("Cannot set affinity for irq %i\n", irq);
278 free_cpumask_var(mask);
286 static inline void handle_one_irq(unsigned int irq)
288 struct thread_info *curtp, *irqtp;
289 unsigned long saved_sp_limit;
290 struct irq_desc *desc;
292 desc = irq_to_desc(irq);
296 /* Switch to the irq stack to handle this */
297 curtp = current_thread_info();
298 irqtp = hardirq_ctx[smp_processor_id()];
300 if (curtp == irqtp) {
301 /* We're already on the irq stack, just handle it */
302 desc->handle_irq(irq, desc);
306 saved_sp_limit = current->thread.ksp_limit;
308 irqtp->task = curtp->task;
311 /* Copy the softirq bits in preempt_count so that the
312 * softirq checks work in the hardirq context. */
313 irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) |
314 (curtp->preempt_count & SOFTIRQ_MASK);
316 current->thread.ksp_limit = (unsigned long)irqtp +
317 _ALIGN_UP(sizeof(struct thread_info), 16);
319 call_handle_irq(irq, desc, irqtp, desc->handle_irq);
320 current->thread.ksp_limit = saved_sp_limit;
323 /* Set any flag that may have been set on the
327 set_bits(irqtp->flags, &curtp->flags);
330 static inline void check_stack_overflow(void)
332 #ifdef CONFIG_DEBUG_STACKOVERFLOW
335 sp = __get_SP() & (THREAD_SIZE-1);
337 /* check for stack overflow: is there less than 2KB free? */
338 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
339 printk("do_IRQ: stack overflow: %ld\n",
340 sp - sizeof(struct thread_info));
346 void do_IRQ(struct pt_regs *regs)
348 struct pt_regs *old_regs = set_irq_regs(regs);
351 trace_irq_entry(regs);
355 check_stack_overflow();
357 irq = ppc_md.get_irq();
359 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE)
361 else if (irq != NO_IRQ_IGNORE)
362 __get_cpu_var(irq_stat).spurious_irqs++;
365 set_irq_regs(old_regs);
367 #ifdef CONFIG_PPC_ISERIES
368 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
369 get_lppaca()->int_dword.fields.decr_int) {
370 get_lppaca()->int_dword.fields.decr_int = 0;
371 /* Signal a fake decrementer interrupt */
372 timer_interrupt(regs);
376 trace_irq_exit(regs);
379 void __init init_IRQ(void)
389 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
390 struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
391 struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
392 struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
394 void exc_lvl_ctx_init(void)
396 struct thread_info *tp;
399 for_each_possible_cpu(i) {
403 cpu_nr = get_hard_smp_processor_id(i);
405 memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE);
406 tp = critirq_ctx[cpu_nr];
408 tp->preempt_count = 0;
411 memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE);
412 tp = dbgirq_ctx[cpu_nr];
414 tp->preempt_count = 0;
416 memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE);
417 tp = mcheckirq_ctx[cpu_nr];
419 tp->preempt_count = HARDIRQ_OFFSET;
425 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
426 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
428 void irq_ctx_init(void)
430 struct thread_info *tp;
433 for_each_possible_cpu(i) {
434 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
437 tp->preempt_count = 0;
439 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
442 tp->preempt_count = HARDIRQ_OFFSET;
446 static inline void do_softirq_onstack(void)
448 struct thread_info *curtp, *irqtp;
449 unsigned long saved_sp_limit = current->thread.ksp_limit;
451 curtp = current_thread_info();
452 irqtp = softirq_ctx[smp_processor_id()];
453 irqtp->task = curtp->task;
454 current->thread.ksp_limit = (unsigned long)irqtp +
455 _ALIGN_UP(sizeof(struct thread_info), 16);
456 call_do_softirq(irqtp);
457 current->thread.ksp_limit = saved_sp_limit;
461 void do_softirq(void)
468 local_irq_save(flags);
470 if (local_softirq_pending())
471 do_softirq_onstack();
473 local_irq_restore(flags);
478 * IRQ controller and virtual interrupts
481 /* The main irq map itself is an array of NR_IRQ entries containing the
482 * associate host and irq number. An entry with a host of NULL is free.
483 * An entry can be allocated if it's free, the allocator always then sets
484 * hwirq first to the host's invalid irq number and then fills ops.
486 struct irq_map_entry {
487 irq_hw_number_t hwirq;
488 struct irq_host *host;
491 static LIST_HEAD(irq_hosts);
492 static DEFINE_RAW_SPINLOCK(irq_big_lock);
493 static DEFINE_MUTEX(revmap_trees_mutex);
494 static struct irq_map_entry irq_map[NR_IRQS];
495 static unsigned int irq_virq_count = NR_IRQS;
496 static struct irq_host *irq_default_host;
498 irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
500 return irq_map[d->irq].hwirq;
502 EXPORT_SYMBOL_GPL(irqd_to_hwirq);
504 irq_hw_number_t virq_to_hw(unsigned int virq)
506 return irq_map[virq].hwirq;
508 EXPORT_SYMBOL_GPL(virq_to_hw);
510 bool virq_is_host(unsigned int virq, struct irq_host *host)
512 return irq_map[virq].host == host;
514 EXPORT_SYMBOL_GPL(virq_is_host);
516 static int default_irq_host_match(struct irq_host *h, struct device_node *np)
518 return h->of_node != NULL && h->of_node == np;
521 struct irq_host *irq_alloc_host(struct device_node *of_node,
522 unsigned int revmap_type,
523 unsigned int revmap_arg,
524 struct irq_host_ops *ops,
525 irq_hw_number_t inval_irq)
527 struct irq_host *host;
528 unsigned int size = sizeof(struct irq_host);
533 /* Allocate structure and revmap table if using linear mapping */
534 if (revmap_type == IRQ_HOST_MAP_LINEAR)
535 size += revmap_arg * sizeof(unsigned int);
536 host = kzalloc(size, GFP_KERNEL);
541 host->revmap_type = revmap_type;
542 host->inval_irq = inval_irq;
544 host->of_node = of_node_get(of_node);
546 if (host->ops->match == NULL)
547 host->ops->match = default_irq_host_match;
549 raw_spin_lock_irqsave(&irq_big_lock, flags);
551 /* If it's a legacy controller, check for duplicates and
552 * mark it as allocated (we use irq 0 host pointer for that
554 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
555 if (irq_map[0].host != NULL) {
556 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
557 of_node_put(host->of_node);
561 irq_map[0].host = host;
564 list_add(&host->link, &irq_hosts);
565 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
567 /* Additional setups per revmap type */
568 switch(revmap_type) {
569 case IRQ_HOST_MAP_LEGACY:
570 /* 0 is always the invalid number for legacy */
572 /* setup us as the host for all legacy interrupts */
573 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
574 irq_map[i].hwirq = i;
576 irq_map[i].host = host;
579 /* Legacy flags are left to default at this point,
580 * one can then use irq_create_mapping() to
581 * explicitly change them
583 ops->map(host, i, i);
585 /* Clear norequest flags */
586 irq_clear_status_flags(i, IRQ_NOREQUEST);
589 case IRQ_HOST_MAP_LINEAR:
590 rmap = (unsigned int *)(host + 1);
591 for (i = 0; i < revmap_arg; i++)
593 host->revmap_data.linear.size = revmap_arg;
595 host->revmap_data.linear.revmap = rmap;
597 case IRQ_HOST_MAP_TREE:
598 INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
604 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
609 struct irq_host *irq_find_host(struct device_node *node)
611 struct irq_host *h, *found = NULL;
614 /* We might want to match the legacy controller last since
615 * it might potentially be set to match all interrupts in
616 * the absence of a device node. This isn't a problem so far
619 raw_spin_lock_irqsave(&irq_big_lock, flags);
620 list_for_each_entry(h, &irq_hosts, link)
621 if (h->ops->match(h, node)) {
625 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
628 EXPORT_SYMBOL_GPL(irq_find_host);
630 void irq_set_default_host(struct irq_host *host)
632 pr_debug("irq: Default host set to @0x%p\n", host);
634 irq_default_host = host;
637 void irq_set_virq_count(unsigned int count)
639 pr_debug("irq: Trying to set virq count to %d\n", count);
641 BUG_ON(count < NUM_ISA_INTERRUPTS);
643 irq_virq_count = count;
646 static int irq_setup_virq(struct irq_host *host, unsigned int virq,
647 irq_hw_number_t hwirq)
651 res = irq_alloc_desc_at(virq, 0);
653 pr_debug("irq: -> allocating desc failed\n");
659 irq_map[virq].hwirq = hwirq;
662 if (host->ops->map(host, virq, hwirq)) {
663 pr_debug("irq: -> mapping failed, freeing\n");
667 irq_clear_status_flags(virq, IRQ_NOREQUEST);
672 irq_free_descs(virq, 1);
674 irq_free_virt(virq, 1);
678 unsigned int irq_create_direct_mapping(struct irq_host *host)
683 host = irq_default_host;
685 BUG_ON(host == NULL);
686 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
688 virq = irq_alloc_virt(host, 1, 0);
689 if (virq == NO_IRQ) {
690 pr_debug("irq: create_direct virq allocation failed\n");
694 pr_debug("irq: create_direct obtained virq %d\n", virq);
696 if (irq_setup_virq(host, virq, virq))
702 unsigned int irq_create_mapping(struct irq_host *host,
703 irq_hw_number_t hwirq)
705 unsigned int virq, hint;
707 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
709 /* Look for default host if nececssary */
711 host = irq_default_host;
713 printk(KERN_WARNING "irq_create_mapping called for"
714 " NULL host, hwirq=%lx\n", hwirq);
718 pr_debug("irq: -> using host @%p\n", host);
720 /* Check if mapping already exists */
721 virq = irq_find_mapping(host, hwirq);
722 if (virq != NO_IRQ) {
723 pr_debug("irq: -> existing mapping on virq %d\n", virq);
727 /* Get a virtual interrupt number */
728 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
730 virq = (unsigned int)hwirq;
731 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
735 /* Allocate a virtual interrupt number */
736 hint = hwirq % irq_virq_count;
737 virq = irq_alloc_virt(host, 1, hint);
738 if (virq == NO_IRQ) {
739 pr_debug("irq: -> virq allocation failed\n");
744 if (irq_setup_virq(host, virq, hwirq))
747 printk(KERN_DEBUG "irq: irq %lu on host %s mapped to virtual irq %u\n",
748 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
752 EXPORT_SYMBOL_GPL(irq_create_mapping);
754 unsigned int irq_create_of_mapping(struct device_node *controller,
755 const u32 *intspec, unsigned int intsize)
757 struct irq_host *host;
758 irq_hw_number_t hwirq;
759 unsigned int type = IRQ_TYPE_NONE;
762 if (controller == NULL)
763 host = irq_default_host;
765 host = irq_find_host(controller);
767 printk(KERN_WARNING "irq: no irq host found for %s !\n",
768 controller->full_name);
772 /* If host has no translation, then we assume interrupt line */
773 if (host->ops->xlate == NULL)
776 if (host->ops->xlate(host, controller, intspec, intsize,
782 virq = irq_create_mapping(host, hwirq);
786 /* Set type if specified and different than the current one */
787 if (type != IRQ_TYPE_NONE &&
788 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
789 irq_set_irq_type(virq, type);
792 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
794 void irq_dispose_mapping(unsigned int virq)
796 struct irq_host *host;
797 irq_hw_number_t hwirq;
802 host = irq_map[virq].host;
803 if (WARN_ON(host == NULL))
806 /* Never unmap legacy interrupts */
807 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
810 irq_set_status_flags(virq, IRQ_NOREQUEST);
812 /* remove chip and handler */
813 irq_set_chip_and_handler(virq, NULL, NULL);
815 /* Make sure it's completed */
816 synchronize_irq(virq);
818 /* Tell the PIC about it */
819 if (host->ops->unmap)
820 host->ops->unmap(host, virq);
823 /* Clear reverse map */
824 hwirq = irq_map[virq].hwirq;
825 switch(host->revmap_type) {
826 case IRQ_HOST_MAP_LINEAR:
827 if (hwirq < host->revmap_data.linear.size)
828 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
830 case IRQ_HOST_MAP_TREE:
831 mutex_lock(&revmap_trees_mutex);
832 radix_tree_delete(&host->revmap_data.tree, hwirq);
833 mutex_unlock(&revmap_trees_mutex);
839 irq_map[virq].hwirq = host->inval_irq;
841 irq_free_descs(virq, 1);
843 irq_free_virt(virq, 1);
845 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
847 unsigned int irq_find_mapping(struct irq_host *host,
848 irq_hw_number_t hwirq)
851 unsigned int hint = hwirq % irq_virq_count;
853 /* Look for default host if nececssary */
855 host = irq_default_host;
859 /* legacy -> bail early */
860 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
863 /* Slow path does a linear search of the map */
864 if (hint < NUM_ISA_INTERRUPTS)
865 hint = NUM_ISA_INTERRUPTS;
868 if (irq_map[i].host == host &&
869 irq_map[i].hwirq == hwirq)
872 if (i >= irq_virq_count)
873 i = NUM_ISA_INTERRUPTS;
877 EXPORT_SYMBOL_GPL(irq_find_mapping);
880 int irq_choose_cpu(const struct cpumask *mask)
884 if (cpumask_equal(mask, cpu_all_mask)) {
885 static int irq_rover;
886 static DEFINE_RAW_SPINLOCK(irq_rover_lock);
889 /* Round-robin distribution... */
891 raw_spin_lock_irqsave(&irq_rover_lock, flags);
893 irq_rover = cpumask_next(irq_rover, cpu_online_mask);
894 if (irq_rover >= nr_cpu_ids)
895 irq_rover = cpumask_first(cpu_online_mask);
899 raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
901 cpuid = cpumask_first_and(mask, cpu_online_mask);
902 if (cpuid >= nr_cpu_ids)
906 return get_hard_smp_processor_id(cpuid);
909 int irq_choose_cpu(const struct cpumask *mask)
911 return hard_smp_processor_id();
915 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
916 irq_hw_number_t hwirq)
918 struct irq_map_entry *ptr;
921 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
922 return irq_find_mapping(host, hwirq);
925 * The ptr returned references the static global irq_map.
926 * but freeing an irq can delete nodes along the path to
927 * do the lookup via call_rcu.
930 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
934 * If found in radix tree, then fine.
935 * Else fallback to linear lookup - this should not happen in practice
936 * as it means that we failed to insert the node in the radix tree.
939 virq = ptr - irq_map;
941 virq = irq_find_mapping(host, hwirq);
946 void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
947 irq_hw_number_t hwirq)
949 if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
952 if (virq != NO_IRQ) {
953 mutex_lock(&revmap_trees_mutex);
954 radix_tree_insert(&host->revmap_data.tree, hwirq,
956 mutex_unlock(&revmap_trees_mutex);
960 unsigned int irq_linear_revmap(struct irq_host *host,
961 irq_hw_number_t hwirq)
963 unsigned int *revmap;
965 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
966 return irq_find_mapping(host, hwirq);
968 /* Check revmap bounds */
969 if (unlikely(hwirq >= host->revmap_data.linear.size))
970 return irq_find_mapping(host, hwirq);
972 /* Check if revmap was allocated */
973 revmap = host->revmap_data.linear.revmap;
974 if (unlikely(revmap == NULL))
975 return irq_find_mapping(host, hwirq);
977 /* Fill up revmap with slow path if no mapping found */
978 if (unlikely(revmap[hwirq] == NO_IRQ))
979 revmap[hwirq] = irq_find_mapping(host, hwirq);
981 return revmap[hwirq];
984 unsigned int irq_alloc_virt(struct irq_host *host,
989 unsigned int i, j, found = NO_IRQ;
991 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
994 raw_spin_lock_irqsave(&irq_big_lock, flags);
996 /* Use hint for 1 interrupt if any */
997 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
998 hint < irq_virq_count && irq_map[hint].host == NULL) {
1003 /* Look for count consecutive numbers in the allocatable
1004 * (non-legacy) space
1006 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
1007 if (irq_map[i].host != NULL)
1013 found = i - count + 1;
1017 if (found == NO_IRQ) {
1018 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1022 for (i = found; i < (found + count); i++) {
1023 irq_map[i].hwirq = host->inval_irq;
1025 irq_map[i].host = host;
1027 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1031 void irq_free_virt(unsigned int virq, unsigned int count)
1033 unsigned long flags;
1036 WARN_ON (virq < NUM_ISA_INTERRUPTS);
1037 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
1039 if (virq < NUM_ISA_INTERRUPTS) {
1040 if (virq + count < NUM_ISA_INTERRUPTS)
1042 count =- NUM_ISA_INTERRUPTS - virq;
1043 virq = NUM_ISA_INTERRUPTS;
1046 if (count > irq_virq_count || virq > irq_virq_count - count) {
1047 if (virq > irq_virq_count)
1049 count = irq_virq_count - virq;
1052 raw_spin_lock_irqsave(&irq_big_lock, flags);
1053 for (i = virq; i < (virq + count); i++) {
1054 struct irq_host *host;
1056 host = irq_map[i].host;
1057 irq_map[i].hwirq = host->inval_irq;
1059 irq_map[i].host = NULL;
1061 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1064 int arch_early_irq_init(void)
1069 #ifdef CONFIG_VIRQ_DEBUG
1070 static int virq_debug_show(struct seq_file *m, void *private)
1072 unsigned long flags;
1073 struct irq_desc *desc;
1075 static const char none[] = "none";
1079 seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
1080 "chip name", "chip data", "host name");
1082 for (i = 1; i < nr_irqs; i++) {
1083 desc = irq_to_desc(i);
1087 raw_spin_lock_irqsave(&desc->lock, flags);
1089 if (desc->action && desc->action->handler) {
1090 struct irq_chip *chip;
1092 seq_printf(m, "%5d ", i);
1093 seq_printf(m, "0x%05lx ", irq_map[i].hwirq);
1095 chip = irq_desc_get_chip(desc);
1096 if (chip && chip->name)
1100 seq_printf(m, "%-15s ", p);
1102 data = irq_desc_get_chip_data(desc);
1103 seq_printf(m, "0x%16p ", data);
1105 if (irq_map[i].host && irq_map[i].host->of_node)
1106 p = irq_map[i].host->of_node->full_name;
1109 seq_printf(m, "%s\n", p);
1112 raw_spin_unlock_irqrestore(&desc->lock, flags);
1118 static int virq_debug_open(struct inode *inode, struct file *file)
1120 return single_open(file, virq_debug_show, inode->i_private);
1123 static const struct file_operations virq_debug_fops = {
1124 .open = virq_debug_open,
1126 .llseek = seq_lseek,
1127 .release = single_release,
1130 static int __init irq_debugfs_init(void)
1132 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
1133 NULL, &virq_debug_fops) == NULL)
1138 __initcall(irq_debugfs_init);
1139 #endif /* CONFIG_VIRQ_DEBUG */
1142 static int __init setup_noirqdistrib(char *str)
1144 distribute_irqs = 0;
1148 __setup("noirqdistrib", setup_noirqdistrib);
1149 #endif /* CONFIG_PPC64 */