^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * This file contains the interrupt descriptor management code. Detailed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * information is available in Documentation/core-api/genericirq.rst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel_stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/radix-tree.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/bitmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/irqdomain.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "internals.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * lockdep: we want to handle all irq_desc locks as a single lock-class:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static struct lock_class_key irq_desc_lock_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #if defined(CONFIG_SMP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static int __init irq_affinity_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) alloc_bootmem_cpumask_var(&irq_default_affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) cpulist_parse(str, irq_default_affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * Set at least the boot cpu. We don't want to end up with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * bugreports caused by random comandline masks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) __setup("irqaffinity=", irq_affinity_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static void __init init_irq_default_affinity(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (!cpumask_available(irq_default_affinity))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (cpumask_empty(irq_default_affinity))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) cpumask_setall(irq_default_affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static void __init init_irq_default_affinity(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int alloc_masks(struct irq_desc *desc, int node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) GFP_KERNEL, node))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (!zalloc_cpumask_var_node(&desc->irq_common_data.effective_affinity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) GFP_KERNEL, node)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) free_cpumask_var(desc->irq_common_data.affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #ifdef CONFIG_GENERIC_PENDING_IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (!zalloc_cpumask_var_node(&desc->pending_mask, GFP_KERNEL, node)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) free_cpumask_var(desc->irq_common_data.effective_affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) free_cpumask_var(desc->irq_common_data.affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static void desc_smp_init(struct irq_desc *desc, int node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) const struct cpumask *affinity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (!affinity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) affinity = irq_default_affinity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) cpumask_copy(desc->irq_common_data.affinity, affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #ifdef CONFIG_GENERIC_PENDING_IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) cpumask_clear(desc->pending_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) #ifdef CONFIG_NUMA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) desc->irq_common_data.node = node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) alloc_masks(struct irq_desc *desc, int node) { return 0; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) const struct cpumask *affinity, struct module *owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) desc->irq_common_data.handler_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) desc->irq_common_data.msi_desc = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) desc->irq_data.common = &desc->irq_common_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) desc->irq_data.irq = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) desc->irq_data.chip = &no_irq_chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) desc->irq_data.chip_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) desc->handle_irq = handle_bad_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) desc->depth = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) desc->irq_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) desc->irqs_unhandled = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) desc->tot_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) desc->name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) desc->owner = owner;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) for_each_possible_cpu(cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) desc_smp_init(desc, node, affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) int nr_irqs = NR_IRQS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) EXPORT_SYMBOL_GPL(nr_irqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static DEFINE_MUTEX(sparse_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #ifdef CONFIG_SPARSE_IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static void irq_kobj_release(struct kobject *kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) #ifdef CONFIG_SYSFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static struct kobject *irq_kobj_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #define IRQ_ATTR_RO(_name) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static ssize_t per_cpu_count_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct kobj_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) int cpu, irq = desc->irq_data.irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) char *p = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) unsigned int c = kstat_irqs_cpu(irq, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) p = ",";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) IRQ_ATTR_RO(per_cpu_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static ssize_t chip_name_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct kobj_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) raw_spin_lock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if (desc->irq_data.chip && desc->irq_data.chip->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ret = scnprintf(buf, PAGE_SIZE, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) desc->irq_data.chip->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) raw_spin_unlock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) IRQ_ATTR_RO(chip_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static ssize_t hwirq_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct kobj_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) raw_spin_lock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (desc->irq_data.domain)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) ret = sprintf(buf, "%d\n", (int)desc->irq_data.hwirq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) raw_spin_unlock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) IRQ_ATTR_RO(hwirq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static ssize_t type_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) struct kobj_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) raw_spin_lock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ret = sprintf(buf, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) irqd_is_level_type(&desc->irq_data) ? "level" : "edge");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) raw_spin_unlock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) IRQ_ATTR_RO(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static ssize_t wakeup_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) struct kobj_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) raw_spin_lock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) ret = sprintf(buf, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) raw_spin_unlock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) IRQ_ATTR_RO(wakeup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static ssize_t name_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) struct kobj_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) raw_spin_lock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (desc->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) raw_spin_unlock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) IRQ_ATTR_RO(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static ssize_t actions_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) struct kobj_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) struct irqaction *action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) char *p = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) raw_spin_lock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) for (action = desc->action; action != NULL; action = action->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) p, action->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) p = ",";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) raw_spin_unlock_irq(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) IRQ_ATTR_RO(actions);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static struct attribute *irq_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) &per_cpu_count_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) &chip_name_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) &hwirq_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) &type_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) &wakeup_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) &name_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) &actions_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) ATTRIBUTE_GROUPS(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) static struct kobj_type irq_kobj_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) .release = irq_kobj_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) .sysfs_ops = &kobj_sysfs_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) .default_groups = irq_groups,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static void irq_sysfs_add(int irq, struct irq_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) if (irq_kobj_base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * Continue even in case of failure as this is nothing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * crucial.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) pr_warn("Failed to add kobject for irq %d\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static void irq_sysfs_del(struct irq_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * If irq_sysfs_init() has not yet been invoked (early boot), then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * irq_kobj_base is NULL and the descriptor was never added.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * kobject_del() complains about a object with no parent, so make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * it conditional.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (irq_kobj_base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) kobject_del(&desc->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static int __init irq_sysfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) /* Prevent concurrent irq alloc/free */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) irq_lock_sparse();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) irq_kobj_base = kobject_create_and_add("irq", kernel_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (!irq_kobj_base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) irq_unlock_sparse();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) /* Add the already allocated interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) for_each_irq_desc(irq, desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) irq_sysfs_add(irq, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) irq_unlock_sparse();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) postcore_initcall(irq_sysfs_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) #else /* !CONFIG_SYSFS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static struct kobj_type irq_kobj_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) .release = irq_kobj_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) static void irq_sysfs_add(int irq, struct irq_desc *desc) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) static void irq_sysfs_del(struct irq_desc *desc) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) #endif /* CONFIG_SYSFS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) radix_tree_insert(&irq_desc_tree, irq, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) struct irq_desc *irq_to_desc(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return radix_tree_lookup(&irq_desc_tree, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) EXPORT_SYMBOL(irq_to_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) static void delete_irq_desc(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) radix_tree_delete(&irq_desc_tree, irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static void free_masks(struct irq_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) #ifdef CONFIG_GENERIC_PENDING_IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) free_cpumask_var(desc->pending_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) free_cpumask_var(desc->irq_common_data.affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) free_cpumask_var(desc->irq_common_data.effective_affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) static inline void free_masks(struct irq_desc *desc) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) void irq_lock_sparse(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) mutex_lock(&sparse_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) void irq_unlock_sparse(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) mutex_unlock(&sparse_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) const struct cpumask *affinity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct module *owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (!desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) /* allocate based on nr_cpu_ids */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) desc->kstat_irqs = alloc_percpu(unsigned int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if (!desc->kstat_irqs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) goto err_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (alloc_masks(desc, node))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) goto err_kstat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) raw_spin_lock_init(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) lockdep_set_class(&desc->lock, &irq_desc_lock_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) mutex_init(&desc->request_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) init_rcu_head(&desc->rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) desc_set_defaults(irq, desc, node, affinity, owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) irqd_set(&desc->irq_data, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) kobject_init(&desc->kobj, &irq_kobj_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) return desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) err_kstat:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) free_percpu(desc->kstat_irqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) err_desc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) kfree(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) static void irq_kobj_release(struct kobject *kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) free_masks(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) free_percpu(desc->kstat_irqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) kfree(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) static void delayed_free_desc(struct rcu_head *rhp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) kobject_put(&desc->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) static void free_desc(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) struct irq_desc *desc = irq_to_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) irq_remove_debugfs_entry(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) unregister_irq_proc(irq, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) * sparse_irq_lock protects also show_interrupts() and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) * kstat_irq_usr(). Once we deleted the descriptor from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) * sparse tree we can free it. Access in proc will fail to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) * lookup the descriptor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * The sysfs entry must be serialized against a concurrent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * irq_sysfs_init() as well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) irq_sysfs_del(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) delete_irq_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) * We free the descriptor, masks and stat fields via RCU. That
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) * allows demultiplex interrupts to do rcu based management of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) * the child interrupts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) * This also allows us to use rcu in kstat_irqs_usr().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) call_rcu(&desc->rcu, delayed_free_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) static int alloc_descs(unsigned int start, unsigned int cnt, int node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) const struct irq_affinity_desc *affinity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) struct module *owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) /* Validate affinity mask(s) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (affinity) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) for (i = 0; i < cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (cpumask_empty(&affinity[i].mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) for (i = 0; i < cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) const struct cpumask *mask = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) unsigned int flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (affinity) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (affinity->is_managed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) flags = IRQD_AFFINITY_MANAGED |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) IRQD_MANAGED_SHUTDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) mask = &affinity->mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) node = cpu_to_node(cpumask_first(mask));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) affinity++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) desc = alloc_desc(start + i, node, flags, mask, owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (!desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) irq_insert_desc(start + i, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) irq_sysfs_add(start + i, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) irq_add_debugfs_entry(start + i, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) bitmap_set(allocated_irqs, start, cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) for (i--; i >= 0; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) free_desc(start + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) static int irq_expand_nr_irqs(unsigned int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) if (nr > IRQ_BITMAP_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) nr_irqs = nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) int __init early_irq_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) int i, initcnt, node = first_online_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) init_irq_default_affinity();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) /* Let arch update nr_irqs and return the nr of preallocated irqs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) initcnt = arch_probe_nr_irqs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) NR_IRQS, nr_irqs, initcnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) nr_irqs = IRQ_BITMAP_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) initcnt = IRQ_BITMAP_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) if (initcnt > nr_irqs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) nr_irqs = initcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) for (i = 0; i < initcnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) desc = alloc_desc(i, node, 0, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) set_bit(i, allocated_irqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) irq_insert_desc(i, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) return arch_early_irq_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) #else /* !CONFIG_SPARSE_IRQ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) [0 ... NR_IRQS-1] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) .handle_irq = handle_bad_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) .depth = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) int __init early_irq_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) int count, i, node = first_online_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) init_irq_default_affinity();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) desc = irq_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) count = ARRAY_SIZE(irq_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) desc[i].kstat_irqs = alloc_percpu(unsigned int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) alloc_masks(&desc[i], node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) raw_spin_lock_init(&desc[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) mutex_init(&desc[i].request_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) desc_set_defaults(i, &desc[i], node, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) return arch_early_irq_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) struct irq_desc *irq_to_desc(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) return (irq < NR_IRQS) ? irq_desc + irq : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) EXPORT_SYMBOL(irq_to_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) static void free_desc(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) struct irq_desc *desc = irq_to_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) raw_spin_lock_irqsave(&desc->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) raw_spin_unlock_irqrestore(&desc->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) static inline int alloc_descs(unsigned int start, unsigned int cnt, int node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) const struct irq_affinity_desc *affinity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) struct module *owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) u32 i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) for (i = 0; i < cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) struct irq_desc *desc = irq_to_desc(start + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) desc->owner = owner;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) bitmap_set(allocated_irqs, start, cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) return start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) static int irq_expand_nr_irqs(unsigned int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) void irq_mark_irq(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) mutex_lock(&sparse_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) bitmap_set(allocated_irqs, irq, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) mutex_unlock(&sparse_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) #ifdef CONFIG_GENERIC_IRQ_LEGACY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) void irq_init_desc(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) free_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) #endif /* !CONFIG_SPARSE_IRQ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) * generic_handle_irq - Invoke the handler for a particular irq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) * @irq: The irq number to handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) int generic_handle_irq(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) struct irq_desc *desc = irq_to_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) struct irq_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) if (!desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) data = irq_desc_get_irq_data(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) if (WARN_ON_ONCE(!in_irq() && handle_enforce_irqctx(data)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) generic_handle_irq_desc(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) EXPORT_SYMBOL_GPL(generic_handle_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) #ifdef CONFIG_HANDLE_DOMAIN_IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) * @domain: The domain where to perform the lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) * @hwirq: The HW irq number to convert to a logical one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) * @lookup: Whether to perform the domain lookup or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) * @regs: Register file coming from the low-level handling code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) * Returns: 0 on success, or -EINVAL if conversion has failed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) bool lookup, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) struct pt_regs *old_regs = set_irq_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) unsigned int irq = hwirq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) #ifdef CONFIG_IRQ_DOMAIN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) if (lookup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) irq = irq_find_mapping(domain, hwirq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) * Some hardware gives randomly wrong interrupts. Rather
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) * than crashing, do something sensible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) if (unlikely(!irq || irq >= nr_irqs || !(desc = irq_to_desc(irq)))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) ack_bad_irq(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) if (IS_ENABLED(CONFIG_ARCH_WANTS_IRQ_RAW) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) unlikely(irq_settings_is_raw(desc))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) generic_handle_irq_desc(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) irq_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) generic_handle_irq_desc(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) irq_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) set_irq_regs(old_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) #ifdef CONFIG_IRQ_DOMAIN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) * handle_domain_nmi - Invoke the handler for a HW irq belonging to a domain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) * @domain: The domain where to perform the lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) * @hwirq: The HW irq number to convert to a logical one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) * @regs: Register file coming from the low-level handling code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) * This function must be called from an NMI context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) * Returns: 0 on success, or -EINVAL if conversion has failed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) struct pt_regs *old_regs = set_irq_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) * NMI context needs to be setup earlier in order to deal with tracing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) WARN_ON(!in_nmi());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) irq = irq_find_mapping(domain, hwirq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) * ack_bad_irq is not NMI-safe, just report
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) * an invalid interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) if (likely(irq))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) generic_handle_irq(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) set_irq_regs(old_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) /* Dynamic interrupt handling */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) * irq_free_descs - free irq descriptors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) * @from: Start of descriptor range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) * @cnt: Number of consecutive irqs to free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) void irq_free_descs(unsigned int from, unsigned int cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) if (from >= nr_irqs || (from + cnt) > nr_irqs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) mutex_lock(&sparse_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) for (i = 0; i < cnt; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) free_desc(from + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) bitmap_clear(allocated_irqs, from, cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) mutex_unlock(&sparse_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) EXPORT_SYMBOL_GPL(irq_free_descs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) * __irq_alloc_descs - allocate and initialize a range of irq descriptors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) * @irq: Allocate for specific irq number if irq >= 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) * @from: Start the search from this irq number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) * @cnt: Number of consecutive irqs to allocate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) * @node: Preferred node on which the irq descriptor should be allocated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) * @owner: Owning module (can be NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) * @affinity: Optional pointer to an affinity mask array of size @cnt which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) * hints where the irq descriptors should be allocated and which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) * default affinities to use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) * Returns the first irq number or error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) int __ref
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) struct module *owner, const struct irq_affinity_desc *affinity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) int start, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) if (!cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) if (irq >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) if (from > irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) from = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) * For interrupts which are freely allocated the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) * architecture can force a lower bound to the @from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) * argument. x86 uses this to exclude the GSI space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) from = arch_dynirq_lower_bound(from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) mutex_lock(&sparse_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) from, cnt, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) if (irq >=0 && start != irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) if (start + cnt > nr_irqs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) ret = irq_expand_nr_irqs(start + cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) ret = alloc_descs(start, cnt, node, affinity, owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) mutex_unlock(&sparse_irq_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) EXPORT_SYMBOL_GPL(__irq_alloc_descs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) #ifdef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) * irq_alloc_hwirqs - Allocate an irq descriptor and initialize the hardware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) * @cnt: number of interrupts to allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) * @node: node on which to allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) * Returns an interrupt number > 0 or 0, if the allocation fails.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) unsigned int irq_alloc_hwirqs(int cnt, int node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) int i, irq = __irq_alloc_descs(-1, 0, cnt, node, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) if (irq < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) for (i = irq; cnt > 0; i++, cnt--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) if (arch_setup_hwirq(i, node))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) irq_clear_status_flags(i, _IRQ_NOREQUEST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) return irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) for (i--; i >= irq; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) arch_teardown_hwirq(i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) irq_free_descs(irq, cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) EXPORT_SYMBOL_GPL(irq_alloc_hwirqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) * irq_free_hwirqs - Free irq descriptor and cleanup the hardware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) * @from: Free from irq number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) * @cnt: number of interrupts to free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) void irq_free_hwirqs(unsigned int from, int cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) for (i = from, j = cnt; j > 0; i++, j--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) arch_teardown_hwirq(i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) irq_free_descs(from, cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) EXPORT_SYMBOL_GPL(irq_free_hwirqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) * irq_get_next_irq - get next allocated irq number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) * @offset: where to start the search
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) * Returns next irq number after offset or nr_irqs if none is found.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) unsigned int irq_get_next_irq(unsigned int offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) return find_next_bit(allocated_irqs, nr_irqs, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) struct irq_desc *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) unsigned int check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) struct irq_desc *desc = irq_to_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) if (desc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) if (check & _IRQ_DESC_CHECK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) if ((check & _IRQ_DESC_PERCPU) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) !irq_settings_is_per_cpu_devid(desc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) if (!(check & _IRQ_DESC_PERCPU) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) irq_settings_is_per_cpu_devid(desc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) if (bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) chip_bus_lock(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) raw_spin_lock_irqsave(&desc->lock, *flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) return desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) __releases(&desc->lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) raw_spin_unlock_irqrestore(&desc->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) if (bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) chip_bus_sync_unlock(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) int irq_set_percpu_devid_partition(unsigned int irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) const struct cpumask *affinity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) struct irq_desc *desc = irq_to_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) if (!desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) if (desc->percpu_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) if (!desc->percpu_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) if (affinity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) desc->percpu_affinity = affinity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) desc->percpu_affinity = cpu_possible_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) irq_set_percpu_devid_flags(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) int irq_set_percpu_devid(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) return irq_set_percpu_devid_partition(irq, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) struct irq_desc *desc = irq_to_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) if (!desc || !desc->percpu_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) if (affinity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) cpumask_copy(affinity, desc->percpu_affinity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) void kstat_incr_irq_this_cpu(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) kstat_incr_irqs_this_cpu(irq_to_desc(irq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) * kstat_irqs_cpu - Get the statistics for an interrupt on a cpu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) * @irq: The interrupt number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) * @cpu: The cpu number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) * Returns the sum of interrupt counts on @cpu since boot for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) * @irq. The caller must ensure that the interrupt is not removed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) * concurrently.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) struct irq_desc *desc = irq_to_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) return desc && desc->kstat_irqs ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) EXPORT_SYMBOL_GPL(kstat_irqs_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) static bool irq_is_nmi(struct irq_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) return desc->istate & IRQS_NMI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) * kstat_irqs - Get the statistics for an interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) * @irq: The interrupt number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) * Returns the sum of interrupt counts on all cpus since boot for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) * @irq. The caller must ensure that the interrupt is not removed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) * concurrently.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) unsigned int kstat_irqs(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) struct irq_desc *desc = irq_to_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) unsigned int sum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) if (!desc || !desc->kstat_irqs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) if (!irq_settings_is_per_cpu_devid(desc) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) !irq_settings_is_per_cpu(desc) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) !irq_is_nmi(desc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) return desc->tot_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) for_each_possible_cpu(cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) sum += *per_cpu_ptr(desc->kstat_irqs, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) return sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) * kstat_irqs_usr - Get the statistics for an interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) * @irq: The interrupt number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) * Returns the sum of interrupt counts on all cpus since boot for @irq.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) * Contrary to kstat_irqs() this can be called from any context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) * It uses rcu since a concurrent removal of an interrupt descriptor is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) * observing an rcu grace period before delayed_free_desc()/irq_kobj_release().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) unsigned int kstat_irqs_usr(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) unsigned int sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) sum = kstat_irqs(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) return sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) EXPORT_SYMBOL_GPL(kstat_irqs_usr);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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