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)
10 * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
17 * This file contains the code used by various IRQ handling routines:
18 * asking for different IRQ's should be done through these routines
19 * instead of just grabbing them. Thus setups with different IRQ numbers
20 * shouldn't result in any weird surprises, and installing new handlers
23 * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the
24 * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit
25 * mask register (of which only 16 are defined), hence the weird shifting
26 * and complement of the cached_irq_mask. I want to be able to stuff
27 * this right into the SIU SMASK register.
28 * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
29 * to reduce code space and undefined function references.
34 #include <linux/module.h>
35 #include <linux/threads.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/signal.h>
38 #include <linux/sched.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/interrupt.h>
42 #include <linux/timex.h>
43 #include <linux/init.h>
44 #include <linux/slab.h>
45 #include <linux/delay.h>
46 #include <linux/irq.h>
47 #include <linux/seq_file.h>
48 #include <linux/cpumask.h>
49 #include <linux/profile.h>
50 #include <linux/bitops.h>
51 #include <linux/list.h>
52 #include <linux/radix-tree.h>
53 #include <linux/mutex.h>
54 #include <linux/bootmem.h>
55 #include <linux/vs_context.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 #ifdef CONFIG_PPC_ISERIES
71 int __irq_offset_value;
72 static int ppc_spurious_interrupts;
75 EXPORT_SYMBOL(__irq_offset_value);
76 atomic_t ppc_n_lost_interrupts;
78 #ifndef CONFIG_PPC_MERGE
79 #define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
80 unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
84 extern int tau_initialized;
85 extern int tau_interrupts(int);
87 #endif /* CONFIG_PPC32 */
89 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
90 extern atomic_t ipi_recv;
91 extern atomic_t ipi_sent;
95 EXPORT_SYMBOL(irq_desc);
97 int distribute_irqs = 1;
98 #endif /* CONFIG_PPC64 */
100 int show_interrupts(struct seq_file *p, void *v)
102 int i = *(loff_t *)v, j;
103 struct irqaction *action;
109 for_each_online_cpu(j)
110 seq_printf(p, "CPU%d ", j);
115 desc = get_irq_desc(i);
116 spin_lock_irqsave(&desc->lock, flags);
117 action = desc->action;
118 if (!action || !action->handler)
120 seq_printf(p, "%3d: ", i);
122 for_each_online_cpu(j)
123 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
125 seq_printf(p, "%10u ", kstat_irqs(i));
126 #endif /* CONFIG_SMP */
128 seq_printf(p, " %s ", desc->chip->typename);
130 seq_puts(p, " None ");
131 seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge ");
132 seq_printf(p, " %s", action->name);
133 for (action = action->next; action; action = action->next)
134 seq_printf(p, ", %s", action->name);
137 spin_unlock_irqrestore(&desc->lock, flags);
138 } else if (i == NR_IRQS) {
140 #ifdef CONFIG_TAU_INT
141 if (tau_initialized){
142 seq_puts(p, "TAU: ");
143 for_each_online_cpu(j)
144 seq_printf(p, "%10u ", tau_interrupts(j));
145 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
148 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
149 /* should this be per processor send/receive? */
150 seq_printf(p, "IPI (recv/sent): %10u/%u\n",
151 atomic_read(&ipi_recv), atomic_read(&ipi_sent));
153 #endif /* CONFIG_PPC32 */
154 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
159 #ifdef CONFIG_HOTPLUG_CPU
160 void fixup_irqs(cpumask_t map)
168 if (irq_desc[irq].status & IRQ_PER_CPU)
171 cpus_and(mask, irq_desc[irq].affinity, map);
172 if (any_online_cpu(mask) == NR_CPUS) {
173 printk("Breaking affinity for irq %i\n", irq);
176 if (irq_desc[irq].chip->set_affinity)
177 irq_desc[irq].chip->set_affinity(irq, mask);
178 else if (irq_desc[irq].action && !(warned++))
179 printk("Cannot set affinity for irq %i\n", irq);
188 void do_IRQ(struct pt_regs *regs)
191 #ifdef CONFIG_IRQSTACKS
192 struct thread_info *curtp, *irqtp;
197 #ifdef CONFIG_DEBUG_STACKOVERFLOW
198 /* Debugging check for stack overflow: is there less than 2KB free? */
202 sp = __get_SP() & (THREAD_SIZE-1);
204 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
205 printk("do_IRQ: stack overflow: %ld\n",
206 sp - sizeof(struct thread_info));
213 * Every platform is required to implement ppc_md.get_irq.
214 * This function will either return an irq number or -1 to
215 * indicate there are no more pending.
216 * The value -2 is for buggy hardware and means that this IRQ
217 * has already been handled. -- Tom
219 irq = ppc_md.get_irq(regs);
221 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
222 struct vx_info_save vxis;
224 __enter_vx_admin(&vxis);
225 #ifdef CONFIG_IRQSTACKS
226 /* Switch to the irq stack to handle this */
227 curtp = current_thread_info();
228 irqtp = hardirq_ctx[smp_processor_id()];
229 if (curtp != irqtp) {
230 struct irq_desc *desc = irq_desc + irq;
231 void *handler = desc->handle_irq;
234 irqtp->task = curtp->task;
236 call_handle_irq(irq, desc, regs, irqtp, handler);
239 set_bits(irqtp->flags, &curtp->flags);
242 generic_handle_irq(irq, regs);
243 __leave_vx_admin(&vxis);
244 } else if (irq != NO_IRQ_IGNORE)
245 /* That's not SMP safe ... but who cares ? */
246 ppc_spurious_interrupts++;
250 #ifdef CONFIG_PPC_ISERIES
251 if (get_lppaca()->int_dword.fields.decr_int) {
253 get_lppaca()->int_dword.fields.decr_int = 0;
254 /* Signal a fake decrementer interrupt */
255 timer_interrupt(regs);
260 void __init init_IRQ(void)
269 #ifdef CONFIG_IRQSTACKS
270 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
271 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
273 void irq_ctx_init(void)
275 struct thread_info *tp;
278 for_each_possible_cpu(i) {
279 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
282 tp->preempt_count = SOFTIRQ_OFFSET;
284 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
287 tp->preempt_count = HARDIRQ_OFFSET;
291 static inline void do_softirq_onstack(void)
293 struct thread_info *curtp, *irqtp;
295 curtp = current_thread_info();
296 irqtp = softirq_ctx[smp_processor_id()];
297 irqtp->task = curtp->task;
298 call_do_softirq(irqtp);
303 #define do_softirq_onstack() __do_softirq()
304 #endif /* CONFIG_IRQSTACKS */
306 void do_softirq(void)
313 local_irq_save(flags);
315 if (local_softirq_pending())
316 do_softirq_onstack();
318 local_irq_restore(flags);
320 EXPORT_SYMBOL(do_softirq);
324 * IRQ controller and virtual interrupts
327 #ifdef CONFIG_PPC_MERGE
329 static LIST_HEAD(irq_hosts);
330 static spinlock_t irq_big_lock = SPIN_LOCK_UNLOCKED;
331 static DEFINE_PER_CPU(unsigned int, irq_radix_reader);
332 static unsigned int irq_radix_writer;
333 struct irq_map_entry irq_map[NR_IRQS];
334 static unsigned int irq_virq_count = NR_IRQS;
335 static struct irq_host *irq_default_host;
337 struct irq_host *irq_alloc_host(unsigned int revmap_type,
338 unsigned int revmap_arg,
339 struct irq_host_ops *ops,
340 irq_hw_number_t inval_irq)
342 struct irq_host *host;
343 unsigned int size = sizeof(struct irq_host);
348 /* Allocate structure and revmap table if using linear mapping */
349 if (revmap_type == IRQ_HOST_MAP_LINEAR)
350 size += revmap_arg * sizeof(unsigned int);
352 host = kzalloc(size, GFP_KERNEL);
354 host = alloc_bootmem(size);
356 memset(host, 0, size);
362 host->revmap_type = revmap_type;
363 host->inval_irq = inval_irq;
366 spin_lock_irqsave(&irq_big_lock, flags);
368 /* If it's a legacy controller, check for duplicates and
369 * mark it as allocated (we use irq 0 host pointer for that
371 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
372 if (irq_map[0].host != NULL) {
373 spin_unlock_irqrestore(&irq_big_lock, flags);
374 /* If we are early boot, we can't free the structure,
376 * this will be fixed once slab is made available early
377 * instead of the current cruft
383 irq_map[0].host = host;
386 list_add(&host->link, &irq_hosts);
387 spin_unlock_irqrestore(&irq_big_lock, flags);
389 /* Additional setups per revmap type */
390 switch(revmap_type) {
391 case IRQ_HOST_MAP_LEGACY:
392 /* 0 is always the invalid number for legacy */
394 /* setup us as the host for all legacy interrupts */
395 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
396 irq_map[i].hwirq = 0;
398 irq_map[i].host = host;
401 /* Clear norequest flags */
402 get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
404 /* Legacy flags are left to default at this point,
405 * one can then use irq_create_mapping() to
406 * explicitely change them
408 ops->map(host, i, i);
411 case IRQ_HOST_MAP_LINEAR:
412 rmap = (unsigned int *)(host + 1);
413 for (i = 0; i < revmap_arg; i++)
415 host->revmap_data.linear.size = revmap_arg;
417 host->revmap_data.linear.revmap = rmap;
423 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
428 struct irq_host *irq_find_host(struct device_node *node)
430 struct irq_host *h, *found = NULL;
433 /* We might want to match the legacy controller last since
434 * it might potentially be set to match all interrupts in
435 * the absence of a device node. This isn't a problem so far
438 spin_lock_irqsave(&irq_big_lock, flags);
439 list_for_each_entry(h, &irq_hosts, link)
440 if (h->ops->match == NULL || h->ops->match(h, node)) {
444 spin_unlock_irqrestore(&irq_big_lock, flags);
447 EXPORT_SYMBOL_GPL(irq_find_host);
449 void irq_set_default_host(struct irq_host *host)
451 pr_debug("irq: Default host set to @0x%p\n", host);
453 irq_default_host = host;
456 void irq_set_virq_count(unsigned int count)
458 pr_debug("irq: Trying to set virq count to %d\n", count);
460 BUG_ON(count < NUM_ISA_INTERRUPTS);
462 irq_virq_count = count;
465 /* radix tree not lockless safe ! we use a brlock-type mecanism
466 * for now, until we can use a lockless radix tree
468 static void irq_radix_wrlock(unsigned long *flags)
470 unsigned int cpu, ok;
472 spin_lock_irqsave(&irq_big_lock, *flags);
473 irq_radix_writer = 1;
478 for_each_possible_cpu(cpu) {
479 if (per_cpu(irq_radix_reader, cpu)) {
489 static void irq_radix_wrunlock(unsigned long flags)
492 irq_radix_writer = 0;
493 spin_unlock_irqrestore(&irq_big_lock, flags);
496 static void irq_radix_rdlock(unsigned long *flags)
498 local_irq_save(*flags);
499 __get_cpu_var(irq_radix_reader) = 1;
501 if (likely(irq_radix_writer == 0))
503 __get_cpu_var(irq_radix_reader) = 0;
505 spin_lock(&irq_big_lock);
506 __get_cpu_var(irq_radix_reader) = 1;
507 spin_unlock(&irq_big_lock);
510 static void irq_radix_rdunlock(unsigned long flags)
512 __get_cpu_var(irq_radix_reader) = 0;
513 local_irq_restore(flags);
517 unsigned int irq_create_mapping(struct irq_host *host,
518 irq_hw_number_t hwirq)
520 unsigned int virq, hint;
522 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
524 /* Look for default host if nececssary */
526 host = irq_default_host;
528 printk(KERN_WARNING "irq_create_mapping called for"
529 " NULL host, hwirq=%lx\n", hwirq);
533 pr_debug("irq: -> using host @%p\n", host);
535 /* Check if mapping already exist, if it does, call
536 * host->ops->map() to update the flags
538 virq = irq_find_mapping(host, hwirq);
539 if (virq != IRQ_NONE) {
540 pr_debug("irq: -> existing mapping on virq %d\n", virq);
544 /* Get a virtual interrupt number */
545 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
547 virq = (unsigned int)hwirq;
548 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
552 /* Allocate a virtual interrupt number */
553 hint = hwirq % irq_virq_count;
554 virq = irq_alloc_virt(host, 1, hint);
555 if (virq == NO_IRQ) {
556 pr_debug("irq: -> virq allocation failed\n");
560 pr_debug("irq: -> obtained virq %d\n", virq);
562 /* Clear IRQ_NOREQUEST flag */
563 get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
567 irq_map[virq].hwirq = hwirq;
569 if (host->ops->map(host, virq, hwirq)) {
570 pr_debug("irq: -> mapping failed, freeing\n");
571 irq_free_virt(virq, 1);
576 EXPORT_SYMBOL_GPL(irq_create_mapping);
578 extern unsigned int irq_create_of_mapping(struct device_node *controller,
579 u32 *intspec, unsigned int intsize)
581 struct irq_host *host;
582 irq_hw_number_t hwirq;
583 unsigned int type = IRQ_TYPE_NONE;
586 if (controller == NULL)
587 host = irq_default_host;
589 host = irq_find_host(controller);
591 printk(KERN_WARNING "irq: no irq host found for %s !\n",
592 controller->full_name);
596 /* If host has no translation, then we assume interrupt line */
597 if (host->ops->xlate == NULL)
600 if (host->ops->xlate(host, controller, intspec, intsize,
606 virq = irq_create_mapping(host, hwirq);
610 /* Set type if specified and different than the current one */
611 if (type != IRQ_TYPE_NONE &&
612 type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
613 set_irq_type(virq, type);
616 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
618 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
622 if (of_irq_map_one(dev, index, &oirq))
625 return irq_create_of_mapping(oirq.controller, oirq.specifier,
628 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
630 void irq_dispose_mapping(unsigned int virq)
632 struct irq_host *host = irq_map[virq].host;
633 irq_hw_number_t hwirq;
636 WARN_ON (host == NULL);
640 /* Never unmap legacy interrupts */
641 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
644 /* remove chip and handler */
645 set_irq_chip_and_handler(virq, NULL, NULL);
647 /* Make sure it's completed */
648 synchronize_irq(virq);
650 /* Tell the PIC about it */
651 if (host->ops->unmap)
652 host->ops->unmap(host, virq);
655 /* Clear reverse map */
656 hwirq = irq_map[virq].hwirq;
657 switch(host->revmap_type) {
658 case IRQ_HOST_MAP_LINEAR:
659 if (hwirq < host->revmap_data.linear.size)
660 host->revmap_data.linear.revmap[hwirq] = IRQ_NONE;
662 case IRQ_HOST_MAP_TREE:
663 /* Check if radix tree allocated yet */
664 if (host->revmap_data.tree.gfp_mask == 0)
666 irq_radix_wrlock(&flags);
667 radix_tree_delete(&host->revmap_data.tree, hwirq);
668 irq_radix_wrunlock(flags);
674 irq_map[virq].hwirq = host->inval_irq;
677 get_irq_desc(virq)->status |= IRQ_NOREQUEST;
680 irq_free_virt(virq, 1);
682 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
684 unsigned int irq_find_mapping(struct irq_host *host,
685 irq_hw_number_t hwirq)
688 unsigned int hint = hwirq % irq_virq_count;
690 /* Look for default host if nececssary */
692 host = irq_default_host;
696 /* legacy -> bail early */
697 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
700 /* Slow path does a linear search of the map */
701 if (hint < NUM_ISA_INTERRUPTS)
702 hint = NUM_ISA_INTERRUPTS;
705 if (irq_map[i].host == host &&
706 irq_map[i].hwirq == hwirq)
709 if (i >= irq_virq_count)
710 i = NUM_ISA_INTERRUPTS;
714 EXPORT_SYMBOL_GPL(irq_find_mapping);
717 unsigned int irq_radix_revmap(struct irq_host *host,
718 irq_hw_number_t hwirq)
720 struct radix_tree_root *tree;
721 struct irq_map_entry *ptr;
725 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
727 /* Check if the radix tree exist yet. We test the value of
728 * the gfp_mask for that. Sneaky but saves another int in the
729 * structure. If not, we fallback to slow mode
731 tree = &host->revmap_data.tree;
732 if (tree->gfp_mask == 0)
733 return irq_find_mapping(host, hwirq);
735 /* Now try to resolve */
736 irq_radix_rdlock(&flags);
737 ptr = radix_tree_lookup(tree, hwirq);
738 irq_radix_rdunlock(flags);
740 /* Found it, return */
742 virq = ptr - irq_map;
746 /* If not there, try to insert it */
747 virq = irq_find_mapping(host, hwirq);
748 if (virq != NO_IRQ) {
749 irq_radix_wrlock(&flags);
750 radix_tree_insert(tree, hwirq, &irq_map[virq]);
751 irq_radix_wrunlock(flags);
756 unsigned int irq_linear_revmap(struct irq_host *host,
757 irq_hw_number_t hwirq)
759 unsigned int *revmap;
761 WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
763 /* Check revmap bounds */
764 if (unlikely(hwirq >= host->revmap_data.linear.size))
765 return irq_find_mapping(host, hwirq);
767 /* Check if revmap was allocated */
768 revmap = host->revmap_data.linear.revmap;
769 if (unlikely(revmap == NULL))
770 return irq_find_mapping(host, hwirq);
772 /* Fill up revmap with slow path if no mapping found */
773 if (unlikely(revmap[hwirq] == NO_IRQ))
774 revmap[hwirq] = irq_find_mapping(host, hwirq);
776 return revmap[hwirq];
779 unsigned int irq_alloc_virt(struct irq_host *host,
784 unsigned int i, j, found = NO_IRQ;
785 unsigned int limit = irq_virq_count - count;
787 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
790 spin_lock_irqsave(&irq_big_lock, flags);
792 /* Use hint for 1 interrupt if any */
793 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
794 hint < irq_virq_count && irq_map[hint].host == NULL) {
799 /* Look for count consecutive numbers in the allocatable
802 for (i = NUM_ISA_INTERRUPTS; i <= limit; ) {
803 for (j = i; j < (i + count); j++)
804 if (irq_map[j].host != NULL) {
811 if (found == NO_IRQ) {
812 spin_unlock_irqrestore(&irq_big_lock, flags);
816 for (i = found; i < (found + count); i++) {
817 irq_map[i].hwirq = host->inval_irq;
819 irq_map[i].host = host;
821 spin_unlock_irqrestore(&irq_big_lock, flags);
825 void irq_free_virt(unsigned int virq, unsigned int count)
830 WARN_ON (virq < NUM_ISA_INTERRUPTS);
831 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
833 spin_lock_irqsave(&irq_big_lock, flags);
834 for (i = virq; i < (virq + count); i++) {
835 struct irq_host *host;
837 if (i < NUM_ISA_INTERRUPTS ||
838 (virq + count) > irq_virq_count)
841 host = irq_map[i].host;
842 irq_map[i].hwirq = host->inval_irq;
844 irq_map[i].host = NULL;
846 spin_unlock_irqrestore(&irq_big_lock, flags);
849 void irq_early_init(void)
853 for (i = 0; i < NR_IRQS; i++)
854 get_irq_desc(i)->status |= IRQ_NOREQUEST;
857 /* We need to create the radix trees late */
858 static int irq_late_init(void)
863 irq_radix_wrlock(&flags);
864 list_for_each_entry(h, &irq_hosts, link) {
865 if (h->revmap_type == IRQ_HOST_MAP_TREE)
866 INIT_RADIX_TREE(&h->revmap_data.tree, GFP_ATOMIC);
868 irq_radix_wrunlock(flags);
872 arch_initcall(irq_late_init);
874 #endif /* CONFIG_PPC_MERGE */
876 #ifdef CONFIG_PCI_MSI
877 int pci_enable_msi(struct pci_dev * pdev)
879 if (ppc_md.enable_msi)
880 return ppc_md.enable_msi(pdev);
885 void pci_disable_msi(struct pci_dev * pdev)
887 if (ppc_md.disable_msi)
888 ppc_md.disable_msi(pdev);
891 void pci_scan_msi_device(struct pci_dev *dev) {}
892 int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;}
893 void pci_disable_msix(struct pci_dev *dev) {}
894 void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
895 void disable_msi_mode(struct pci_dev *dev, int pos, int type) {}
896 void pci_no_msi(void) {}
901 static int __init setup_noirqdistrib(char *str)
907 __setup("noirqdistrib", setup_noirqdistrib);
908 #endif /* CONFIG_PPC64 */