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 #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 static inline notrace void decrementer_check_overflow(void)
120 u64 now = get_tb_or_rtc();
121 u64 *next_tb = &__get_cpu_var(decrementers_next_tb);
127 notrace void arch_local_irq_restore(unsigned long en)
130 * get_paca()->soft_enabled = en;
131 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
132 * That was allowed before, and in such a case we do need to take care
133 * that gcc will set soft_enabled directly via r13, not choose to use
134 * an intermediate register, lest we're preempted to a different cpu.
136 set_soft_enabled(en);
140 #ifdef CONFIG_PPC_STD_MMU_64
141 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
143 * Do we need to disable preemption here? Not really: in the
144 * unlikely event that we're preempted to a different cpu in
145 * between getting r13, loading its lppaca_ptr, and loading
146 * its any_int, we might call iseries_handle_interrupts without
147 * an interrupt pending on the new cpu, but that's no disaster,
148 * is it? And the business of preempting us off the old cpu
149 * would itself involve a local_irq_restore which handles the
150 * interrupt to that cpu.
152 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
153 * to avoid any preemption checking added into get_paca().
155 if (local_paca->lppaca_ptr->int_dword.any_int)
156 iseries_handle_interrupts();
158 #endif /* CONFIG_PPC_STD_MMU_64 */
161 * if (get_paca()->hard_enabled) return;
162 * But again we need to take care that gcc gets hard_enabled directly
163 * via r13, not choose to use an intermediate register, lest we're
164 * preempted to a different cpu in between the two instructions.
166 if (get_hard_enabled())
170 * Need to hard-enable interrupts here. Since currently disabled,
171 * no need to take further asm precautions against preemption; but
172 * use local_paca instead of get_paca() to avoid preemption checking.
174 local_paca->hard_enabled = en;
177 * Trigger the decrementer if we have a pending event. Some processors
178 * only trigger on edge transitions of the sign bit. We might also
179 * have disabled interrupts long enough that the decrementer wrapped
182 decrementer_check_overflow();
185 * Force the delivery of pending soft-disabled interrupts on PS3.
186 * Any HV call will have this side effect.
188 if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
190 lv1_get_version_info(&tmp, &tmp2);
195 EXPORT_SYMBOL(arch_local_irq_restore);
196 #endif /* CONFIG_PPC64 */
198 int arch_show_interrupts(struct seq_file *p, int prec)
202 #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
203 if (tau_initialized) {
204 seq_printf(p, "%*s: ", prec, "TAU");
205 for_each_online_cpu(j)
206 seq_printf(p, "%10u ", tau_interrupts(j));
207 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
209 #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
211 seq_printf(p, "%*s: ", prec, "LOC");
212 for_each_online_cpu(j)
213 seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs);
214 seq_printf(p, " Local timer interrupts\n");
216 seq_printf(p, "%*s: ", prec, "SPU");
217 for_each_online_cpu(j)
218 seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs);
219 seq_printf(p, " Spurious interrupts\n");
221 seq_printf(p, "%*s: ", prec, "CNT");
222 for_each_online_cpu(j)
223 seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs);
224 seq_printf(p, " Performance monitoring interrupts\n");
226 seq_printf(p, "%*s: ", prec, "MCE");
227 for_each_online_cpu(j)
228 seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
229 seq_printf(p, " Machine check exceptions\n");
237 u64 arch_irq_stat_cpu(unsigned int cpu)
239 u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
241 sum += per_cpu(irq_stat, cpu).pmu_irqs;
242 sum += per_cpu(irq_stat, cpu).mce_exceptions;
243 sum += per_cpu(irq_stat, cpu).spurious_irqs;
248 #ifdef CONFIG_HOTPLUG_CPU
249 void migrate_irqs(void)
251 struct irq_desc *desc;
255 const struct cpumask *map = cpu_online_mask;
257 alloc_cpumask_var(&mask, GFP_KERNEL);
260 struct irq_data *data;
261 struct irq_chip *chip;
263 desc = irq_to_desc(irq);
267 data = irq_desc_get_irq_data(desc);
268 if (irqd_is_per_cpu(data))
271 chip = irq_data_get_irq_chip(data);
273 cpumask_and(mask, data->affinity, map);
274 if (cpumask_any(mask) >= nr_cpu_ids) {
275 printk("Breaking affinity for irq %i\n", irq);
276 cpumask_copy(mask, map);
278 if (chip->irq_set_affinity)
279 chip->irq_set_affinity(data, mask, true);
280 else if (desc->action && !(warned++))
281 printk("Cannot set affinity for irq %i\n", irq);
284 free_cpumask_var(mask);
292 static inline void handle_one_irq(unsigned int irq)
294 struct thread_info *curtp, *irqtp;
295 unsigned long saved_sp_limit;
296 struct irq_desc *desc;
298 desc = irq_to_desc(irq);
302 /* Switch to the irq stack to handle this */
303 curtp = current_thread_info();
304 irqtp = hardirq_ctx[smp_processor_id()];
306 if (curtp == irqtp) {
307 /* We're already on the irq stack, just handle it */
308 desc->handle_irq(irq, desc);
312 saved_sp_limit = current->thread.ksp_limit;
314 irqtp->task = curtp->task;
317 /* Copy the softirq bits in preempt_count so that the
318 * softirq checks work in the hardirq context. */
319 irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) |
320 (curtp->preempt_count & SOFTIRQ_MASK);
322 current->thread.ksp_limit = (unsigned long)irqtp +
323 _ALIGN_UP(sizeof(struct thread_info), 16);
325 call_handle_irq(irq, desc, irqtp, desc->handle_irq);
326 current->thread.ksp_limit = saved_sp_limit;
329 /* Set any flag that may have been set on the
333 set_bits(irqtp->flags, &curtp->flags);
336 static inline void check_stack_overflow(void)
338 #ifdef CONFIG_DEBUG_STACKOVERFLOW
341 sp = __get_SP() & (THREAD_SIZE-1);
343 /* check for stack overflow: is there less than 2KB free? */
344 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
345 printk("do_IRQ: stack overflow: %ld\n",
346 sp - sizeof(struct thread_info));
352 void do_IRQ(struct pt_regs *regs)
354 struct pt_regs *old_regs = set_irq_regs(regs);
357 trace_irq_entry(regs);
361 check_stack_overflow();
363 irq = ppc_md.get_irq();
365 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE)
367 else if (irq != NO_IRQ_IGNORE)
368 __get_cpu_var(irq_stat).spurious_irqs++;
371 set_irq_regs(old_regs);
373 #ifdef CONFIG_PPC_ISERIES
374 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
375 get_lppaca()->int_dword.fields.decr_int) {
376 get_lppaca()->int_dword.fields.decr_int = 0;
377 /* Signal a fake decrementer interrupt */
378 timer_interrupt(regs);
382 trace_irq_exit(regs);
385 void __init init_IRQ(void)
395 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
396 struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
397 struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
398 struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
400 void exc_lvl_ctx_init(void)
402 struct thread_info *tp;
405 for_each_possible_cpu(i) {
409 cpu_nr = get_hard_smp_processor_id(i);
411 memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE);
412 tp = critirq_ctx[cpu_nr];
414 tp->preempt_count = 0;
417 memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE);
418 tp = dbgirq_ctx[cpu_nr];
420 tp->preempt_count = 0;
422 memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE);
423 tp = mcheckirq_ctx[cpu_nr];
425 tp->preempt_count = HARDIRQ_OFFSET;
431 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
432 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
434 void irq_ctx_init(void)
436 struct thread_info *tp;
439 for_each_possible_cpu(i) {
440 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
443 tp->preempt_count = 0;
445 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
448 tp->preempt_count = HARDIRQ_OFFSET;
452 static inline void do_softirq_onstack(void)
454 struct thread_info *curtp, *irqtp;
455 unsigned long saved_sp_limit = current->thread.ksp_limit;
457 curtp = current_thread_info();
458 irqtp = softirq_ctx[smp_processor_id()];
459 irqtp->task = curtp->task;
461 current->thread.ksp_limit = (unsigned long)irqtp +
462 _ALIGN_UP(sizeof(struct thread_info), 16);
463 call_do_softirq(irqtp);
464 current->thread.ksp_limit = saved_sp_limit;
467 /* Set any flag that may have been set on the
471 set_bits(irqtp->flags, &curtp->flags);
474 void do_softirq(void)
481 local_irq_save(flags);
483 if (local_softirq_pending())
484 do_softirq_onstack();
486 local_irq_restore(flags);
491 * IRQ controller and virtual interrupts
494 /* The main irq map itself is an array of NR_IRQ entries containing the
495 * associate host and irq number. An entry with a host of NULL is free.
496 * An entry can be allocated if it's free, the allocator always then sets
497 * hwirq first to the host's invalid irq number and then fills ops.
499 struct irq_map_entry {
500 irq_hw_number_t hwirq;
501 struct irq_host *host;
504 static LIST_HEAD(irq_hosts);
505 static DEFINE_RAW_SPINLOCK(irq_big_lock);
506 static DEFINE_MUTEX(revmap_trees_mutex);
507 static struct irq_map_entry irq_map[NR_IRQS];
508 static unsigned int irq_virq_count = NR_IRQS;
509 static struct irq_host *irq_default_host;
511 irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
513 return irq_map[d->irq].hwirq;
515 EXPORT_SYMBOL_GPL(irqd_to_hwirq);
517 irq_hw_number_t virq_to_hw(unsigned int virq)
519 return irq_map[virq].hwirq;
521 EXPORT_SYMBOL_GPL(virq_to_hw);
523 bool virq_is_host(unsigned int virq, struct irq_host *host)
525 return irq_map[virq].host == host;
527 EXPORT_SYMBOL_GPL(virq_is_host);
529 static int default_irq_host_match(struct irq_host *h, struct device_node *np)
531 return h->of_node != NULL && h->of_node == np;
534 struct irq_host *irq_alloc_host(struct device_node *of_node,
535 unsigned int revmap_type,
536 unsigned int revmap_arg,
537 struct irq_host_ops *ops,
538 irq_hw_number_t inval_irq)
540 struct irq_host *host;
541 unsigned int size = sizeof(struct irq_host);
546 /* Allocate structure and revmap table if using linear mapping */
547 if (revmap_type == IRQ_HOST_MAP_LINEAR)
548 size += revmap_arg * sizeof(unsigned int);
549 host = kzalloc(size, GFP_KERNEL);
554 host->revmap_type = revmap_type;
555 host->inval_irq = inval_irq;
557 host->of_node = of_node_get(of_node);
559 if (host->ops->match == NULL)
560 host->ops->match = default_irq_host_match;
562 raw_spin_lock_irqsave(&irq_big_lock, flags);
564 /* If it's a legacy controller, check for duplicates and
565 * mark it as allocated (we use irq 0 host pointer for that
567 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
568 if (irq_map[0].host != NULL) {
569 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
570 of_node_put(host->of_node);
574 irq_map[0].host = host;
577 list_add(&host->link, &irq_hosts);
578 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
580 /* Additional setups per revmap type */
581 switch(revmap_type) {
582 case IRQ_HOST_MAP_LEGACY:
583 /* 0 is always the invalid number for legacy */
585 /* setup us as the host for all legacy interrupts */
586 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
587 irq_map[i].hwirq = i;
589 irq_map[i].host = host;
592 /* Legacy flags are left to default at this point,
593 * one can then use irq_create_mapping() to
594 * explicitly change them
596 ops->map(host, i, i);
598 /* Clear norequest flags */
599 irq_clear_status_flags(i, IRQ_NOREQUEST);
602 case IRQ_HOST_MAP_LINEAR:
603 rmap = (unsigned int *)(host + 1);
604 for (i = 0; i < revmap_arg; i++)
606 host->revmap_data.linear.size = revmap_arg;
608 host->revmap_data.linear.revmap = rmap;
610 case IRQ_HOST_MAP_TREE:
611 INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
617 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
622 struct irq_host *irq_find_host(struct device_node *node)
624 struct irq_host *h, *found = NULL;
627 /* We might want to match the legacy controller last since
628 * it might potentially be set to match all interrupts in
629 * the absence of a device node. This isn't a problem so far
632 raw_spin_lock_irqsave(&irq_big_lock, flags);
633 list_for_each_entry(h, &irq_hosts, link)
634 if (h->ops->match(h, node)) {
638 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
641 EXPORT_SYMBOL_GPL(irq_find_host);
643 void irq_set_default_host(struct irq_host *host)
645 pr_debug("irq: Default host set to @0x%p\n", host);
647 irq_default_host = host;
650 void irq_set_virq_count(unsigned int count)
652 pr_debug("irq: Trying to set virq count to %d\n", count);
654 BUG_ON(count < NUM_ISA_INTERRUPTS);
656 irq_virq_count = count;
659 static int irq_setup_virq(struct irq_host *host, unsigned int virq,
660 irq_hw_number_t hwirq)
664 res = irq_alloc_desc_at(virq, 0);
666 pr_debug("irq: -> allocating desc failed\n");
672 irq_map[virq].hwirq = hwirq;
675 if (host->ops->map(host, virq, hwirq)) {
676 pr_debug("irq: -> mapping failed, freeing\n");
680 irq_clear_status_flags(virq, IRQ_NOREQUEST);
685 irq_free_descs(virq, 1);
687 irq_free_virt(virq, 1);
691 unsigned int irq_create_direct_mapping(struct irq_host *host)
696 host = irq_default_host;
698 BUG_ON(host == NULL);
699 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
701 virq = irq_alloc_virt(host, 1, 0);
702 if (virq == NO_IRQ) {
703 pr_debug("irq: create_direct virq allocation failed\n");
707 pr_debug("irq: create_direct obtained virq %d\n", virq);
709 if (irq_setup_virq(host, virq, virq))
715 unsigned int irq_create_mapping(struct irq_host *host,
716 irq_hw_number_t hwirq)
718 unsigned int virq, hint;
720 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
722 /* Look for default host if nececssary */
724 host = irq_default_host;
726 printk(KERN_WARNING "irq_create_mapping called for"
727 " NULL host, hwirq=%lx\n", hwirq);
731 pr_debug("irq: -> using host @%p\n", host);
733 /* Check if mapping already exists */
734 virq = irq_find_mapping(host, hwirq);
735 if (virq != NO_IRQ) {
736 pr_debug("irq: -> existing mapping on virq %d\n", virq);
740 /* Get a virtual interrupt number */
741 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
743 virq = (unsigned int)hwirq;
744 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
748 /* Allocate a virtual interrupt number */
749 hint = hwirq % irq_virq_count;
750 virq = irq_alloc_virt(host, 1, hint);
751 if (virq == NO_IRQ) {
752 pr_debug("irq: -> virq allocation failed\n");
757 if (irq_setup_virq(host, virq, hwirq))
760 pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",
761 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
765 EXPORT_SYMBOL_GPL(irq_create_mapping);
767 unsigned int irq_create_of_mapping(struct device_node *controller,
768 const u32 *intspec, unsigned int intsize)
770 struct irq_host *host;
771 irq_hw_number_t hwirq;
772 unsigned int type = IRQ_TYPE_NONE;
775 if (controller == NULL)
776 host = irq_default_host;
778 host = irq_find_host(controller);
780 printk(KERN_WARNING "irq: no irq host found for %s !\n",
781 controller->full_name);
785 /* If host has no translation, then we assume interrupt line */
786 if (host->ops->xlate == NULL)
789 if (host->ops->xlate(host, controller, intspec, intsize,
795 virq = irq_create_mapping(host, hwirq);
799 /* Set type if specified and different than the current one */
800 if (type != IRQ_TYPE_NONE &&
801 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
802 irq_set_irq_type(virq, type);
805 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
807 void irq_dispose_mapping(unsigned int virq)
809 struct irq_host *host;
810 irq_hw_number_t hwirq;
815 host = irq_map[virq].host;
816 if (WARN_ON(host == NULL))
819 /* Never unmap legacy interrupts */
820 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
823 irq_set_status_flags(virq, IRQ_NOREQUEST);
825 /* remove chip and handler */
826 irq_set_chip_and_handler(virq, NULL, NULL);
828 /* Make sure it's completed */
829 synchronize_irq(virq);
831 /* Tell the PIC about it */
832 if (host->ops->unmap)
833 host->ops->unmap(host, virq);
836 /* Clear reverse map */
837 hwirq = irq_map[virq].hwirq;
838 switch(host->revmap_type) {
839 case IRQ_HOST_MAP_LINEAR:
840 if (hwirq < host->revmap_data.linear.size)
841 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
843 case IRQ_HOST_MAP_TREE:
844 mutex_lock(&revmap_trees_mutex);
845 radix_tree_delete(&host->revmap_data.tree, hwirq);
846 mutex_unlock(&revmap_trees_mutex);
852 irq_map[virq].hwirq = host->inval_irq;
854 irq_free_descs(virq, 1);
856 irq_free_virt(virq, 1);
858 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
860 unsigned int irq_find_mapping(struct irq_host *host,
861 irq_hw_number_t hwirq)
864 unsigned int hint = hwirq % irq_virq_count;
866 /* Look for default host if nececssary */
868 host = irq_default_host;
872 /* legacy -> bail early */
873 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
876 /* Slow path does a linear search of the map */
877 if (hint < NUM_ISA_INTERRUPTS)
878 hint = NUM_ISA_INTERRUPTS;
881 if (irq_map[i].host == host &&
882 irq_map[i].hwirq == hwirq)
885 if (i >= irq_virq_count)
886 i = NUM_ISA_INTERRUPTS;
890 EXPORT_SYMBOL_GPL(irq_find_mapping);
893 int irq_choose_cpu(const struct cpumask *mask)
897 if (cpumask_equal(mask, cpu_all_mask)) {
898 static int irq_rover;
899 static DEFINE_RAW_SPINLOCK(irq_rover_lock);
902 /* Round-robin distribution... */
904 raw_spin_lock_irqsave(&irq_rover_lock, flags);
906 irq_rover = cpumask_next(irq_rover, cpu_online_mask);
907 if (irq_rover >= nr_cpu_ids)
908 irq_rover = cpumask_first(cpu_online_mask);
912 raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
914 cpuid = cpumask_first_and(mask, cpu_online_mask);
915 if (cpuid >= nr_cpu_ids)
919 return get_hard_smp_processor_id(cpuid);
922 int irq_choose_cpu(const struct cpumask *mask)
924 return hard_smp_processor_id();
928 unsigned int irq_radix_revmap_lookup(struct irq_host *host,
929 irq_hw_number_t hwirq)
931 struct irq_map_entry *ptr;
934 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
935 return irq_find_mapping(host, hwirq);
938 * The ptr returned references the static global irq_map.
939 * but freeing an irq can delete nodes along the path to
940 * do the lookup via call_rcu.
943 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
947 * If found in radix tree, then fine.
948 * Else fallback to linear lookup - this should not happen in practice
949 * as it means that we failed to insert the node in the radix tree.
952 virq = ptr - irq_map;
954 virq = irq_find_mapping(host, hwirq);
959 void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
960 irq_hw_number_t hwirq)
962 if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
965 if (virq != NO_IRQ) {
966 mutex_lock(&revmap_trees_mutex);
967 radix_tree_insert(&host->revmap_data.tree, hwirq,
969 mutex_unlock(&revmap_trees_mutex);
973 unsigned int irq_linear_revmap(struct irq_host *host,
974 irq_hw_number_t hwirq)
976 unsigned int *revmap;
978 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
979 return irq_find_mapping(host, hwirq);
981 /* Check revmap bounds */
982 if (unlikely(hwirq >= host->revmap_data.linear.size))
983 return irq_find_mapping(host, hwirq);
985 /* Check if revmap was allocated */
986 revmap = host->revmap_data.linear.revmap;
987 if (unlikely(revmap == NULL))
988 return irq_find_mapping(host, hwirq);
990 /* Fill up revmap with slow path if no mapping found */
991 if (unlikely(revmap[hwirq] == NO_IRQ))
992 revmap[hwirq] = irq_find_mapping(host, hwirq);
994 return revmap[hwirq];
997 unsigned int irq_alloc_virt(struct irq_host *host,
1001 unsigned long flags;
1002 unsigned int i, j, found = NO_IRQ;
1004 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
1007 raw_spin_lock_irqsave(&irq_big_lock, flags);
1009 /* Use hint for 1 interrupt if any */
1010 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
1011 hint < irq_virq_count && irq_map[hint].host == NULL) {
1016 /* Look for count consecutive numbers in the allocatable
1017 * (non-legacy) space
1019 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
1020 if (irq_map[i].host != NULL)
1026 found = i - count + 1;
1030 if (found == NO_IRQ) {
1031 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1035 for (i = found; i < (found + count); i++) {
1036 irq_map[i].hwirq = host->inval_irq;
1038 irq_map[i].host = host;
1040 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1044 void irq_free_virt(unsigned int virq, unsigned int count)
1046 unsigned long flags;
1049 WARN_ON (virq < NUM_ISA_INTERRUPTS);
1050 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
1052 if (virq < NUM_ISA_INTERRUPTS) {
1053 if (virq + count < NUM_ISA_INTERRUPTS)
1055 count =- NUM_ISA_INTERRUPTS - virq;
1056 virq = NUM_ISA_INTERRUPTS;
1059 if (count > irq_virq_count || virq > irq_virq_count - count) {
1060 if (virq > irq_virq_count)
1062 count = irq_virq_count - virq;
1065 raw_spin_lock_irqsave(&irq_big_lock, flags);
1066 for (i = virq; i < (virq + count); i++) {
1067 struct irq_host *host;
1069 host = irq_map[i].host;
1070 irq_map[i].hwirq = host->inval_irq;
1072 irq_map[i].host = NULL;
1074 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
1077 int arch_early_irq_init(void)
1082 #ifdef CONFIG_VIRQ_DEBUG
1083 static int virq_debug_show(struct seq_file *m, void *private)
1085 unsigned long flags;
1086 struct irq_desc *desc;
1088 static const char none[] = "none";
1092 seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
1093 "chip name", "chip data", "host name");
1095 for (i = 1; i < nr_irqs; i++) {
1096 desc = irq_to_desc(i);
1100 raw_spin_lock_irqsave(&desc->lock, flags);
1102 if (desc->action && desc->action->handler) {
1103 struct irq_chip *chip;
1105 seq_printf(m, "%5d ", i);
1106 seq_printf(m, "0x%05lx ", irq_map[i].hwirq);
1108 chip = irq_desc_get_chip(desc);
1109 if (chip && chip->name)
1113 seq_printf(m, "%-15s ", p);
1115 data = irq_desc_get_chip_data(desc);
1116 seq_printf(m, "0x%16p ", data);
1118 if (irq_map[i].host && irq_map[i].host->of_node)
1119 p = irq_map[i].host->of_node->full_name;
1122 seq_printf(m, "%s\n", p);
1125 raw_spin_unlock_irqrestore(&desc->lock, flags);
1131 static int virq_debug_open(struct inode *inode, struct file *file)
1133 return single_open(file, virq_debug_show, inode->i_private);
1136 static const struct file_operations virq_debug_fops = {
1137 .open = virq_debug_open,
1139 .llseek = seq_lseek,
1140 .release = single_release,
1143 static int __init irq_debugfs_init(void)
1145 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
1146 NULL, &virq_debug_fops) == NULL)
1151 __initcall(irq_debugfs_init);
1152 #endif /* CONFIG_VIRQ_DEBUG */
1155 static int __init setup_noirqdistrib(char *str)
1157 distribute_irqs = 0;
1161 __setup("noirqdistrib", setup_noirqdistrib);
1162 #endif /* CONFIG_PPC64 */