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991 lines
23 KiB
991 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar |
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* Copyright (C) 2005-2006, Thomas Gleixner, Russell King |
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* |
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* This file contains the interrupt descriptor management code. Detailed |
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* information is available in Documentation/core-api/genericirq.rst |
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* |
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*/ |
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#include <linux/irq.h> |
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#include <linux/slab.h> |
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#include <linux/export.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/radix-tree.h> |
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#include <linux/bitmap.h> |
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#include <linux/irqdomain.h> |
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#include <linux/sysfs.h> |
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|
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#include "internals.h" |
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|
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/* |
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* lockdep: we want to handle all irq_desc locks as a single lock-class: |
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*/ |
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static struct lock_class_key irq_desc_lock_class; |
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|
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#if defined(CONFIG_SMP) |
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static int __init irq_affinity_setup(char *str) |
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{ |
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alloc_bootmem_cpumask_var(&irq_default_affinity); |
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cpulist_parse(str, irq_default_affinity); |
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/* |
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* Set at least the boot cpu. We don't want to end up with |
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* bugreports caused by random commandline masks |
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*/ |
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cpumask_set_cpu(smp_processor_id(), irq_default_affinity); |
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return 1; |
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} |
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__setup("irqaffinity=", irq_affinity_setup); |
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static void __init init_irq_default_affinity(void) |
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{ |
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if (!cpumask_available(irq_default_affinity)) |
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zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT); |
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if (cpumask_empty(irq_default_affinity)) |
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cpumask_setall(irq_default_affinity); |
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} |
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#else |
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static void __init init_irq_default_affinity(void) |
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{ |
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} |
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#endif |
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#ifdef CONFIG_SMP |
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static int alloc_masks(struct irq_desc *desc, int node) |
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{ |
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if (!zalloc_cpumask_var_node(&desc->irq_common_data.affinity, |
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GFP_KERNEL, node)) |
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return -ENOMEM; |
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#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK |
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if (!zalloc_cpumask_var_node(&desc->irq_common_data.effective_affinity, |
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GFP_KERNEL, node)) { |
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free_cpumask_var(desc->irq_common_data.affinity); |
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return -ENOMEM; |
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} |
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#endif |
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#ifdef CONFIG_GENERIC_PENDING_IRQ |
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if (!zalloc_cpumask_var_node(&desc->pending_mask, GFP_KERNEL, node)) { |
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#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK |
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free_cpumask_var(desc->irq_common_data.effective_affinity); |
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#endif |
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free_cpumask_var(desc->irq_common_data.affinity); |
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return -ENOMEM; |
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} |
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#endif |
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return 0; |
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} |
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static void desc_smp_init(struct irq_desc *desc, int node, |
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const struct cpumask *affinity) |
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{ |
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if (!affinity) |
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affinity = irq_default_affinity; |
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cpumask_copy(desc->irq_common_data.affinity, affinity); |
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|
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#ifdef CONFIG_GENERIC_PENDING_IRQ |
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cpumask_clear(desc->pending_mask); |
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#endif |
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#ifdef CONFIG_NUMA |
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desc->irq_common_data.node = node; |
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#endif |
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} |
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#else |
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static inline int |
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alloc_masks(struct irq_desc *desc, int node) { return 0; } |
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static inline void |
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desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { } |
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#endif |
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static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node, |
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const struct cpumask *affinity, struct module *owner) |
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{ |
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int cpu; |
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desc->irq_common_data.handler_data = NULL; |
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desc->irq_common_data.msi_desc = NULL; |
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desc->irq_data.common = &desc->irq_common_data; |
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desc->irq_data.irq = irq; |
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desc->irq_data.chip = &no_irq_chip; |
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desc->irq_data.chip_data = NULL; |
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irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS); |
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irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED); |
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irqd_set(&desc->irq_data, IRQD_IRQ_MASKED); |
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desc->handle_irq = handle_bad_irq; |
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desc->depth = 1; |
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desc->irq_count = 0; |
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desc->irqs_unhandled = 0; |
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desc->tot_count = 0; |
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desc->name = NULL; |
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desc->owner = owner; |
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for_each_possible_cpu(cpu) |
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*per_cpu_ptr(desc->kstat_irqs, cpu) = 0; |
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desc_smp_init(desc, node, affinity); |
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} |
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int nr_irqs = NR_IRQS; |
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EXPORT_SYMBOL_GPL(nr_irqs); |
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static DEFINE_MUTEX(sparse_irq_lock); |
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static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS); |
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#ifdef CONFIG_SPARSE_IRQ |
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static void irq_kobj_release(struct kobject *kobj); |
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#ifdef CONFIG_SYSFS |
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static struct kobject *irq_kobj_base; |
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#define IRQ_ATTR_RO(_name) \ |
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static struct kobj_attribute _name##_attr = __ATTR_RO(_name) |
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static ssize_t per_cpu_count_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj); |
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ssize_t ret = 0; |
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char *p = ""; |
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int cpu; |
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for_each_possible_cpu(cpu) { |
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unsigned int c = irq_desc_kstat_cpu(desc, cpu); |
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ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c); |
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p = ","; |
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} |
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ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); |
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return ret; |
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} |
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IRQ_ATTR_RO(per_cpu_count); |
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static ssize_t chip_name_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj); |
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ssize_t ret = 0; |
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raw_spin_lock_irq(&desc->lock); |
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if (desc->irq_data.chip && desc->irq_data.chip->name) { |
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ret = scnprintf(buf, PAGE_SIZE, "%s\n", |
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desc->irq_data.chip->name); |
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} |
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raw_spin_unlock_irq(&desc->lock); |
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return ret; |
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} |
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IRQ_ATTR_RO(chip_name); |
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static ssize_t hwirq_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj); |
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ssize_t ret = 0; |
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raw_spin_lock_irq(&desc->lock); |
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if (desc->irq_data.domain) |
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ret = sprintf(buf, "%lu\n", desc->irq_data.hwirq); |
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raw_spin_unlock_irq(&desc->lock); |
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return ret; |
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} |
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IRQ_ATTR_RO(hwirq); |
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static ssize_t type_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj); |
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ssize_t ret = 0; |
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raw_spin_lock_irq(&desc->lock); |
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ret = sprintf(buf, "%s\n", |
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irqd_is_level_type(&desc->irq_data) ? "level" : "edge"); |
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raw_spin_unlock_irq(&desc->lock); |
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return ret; |
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} |
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IRQ_ATTR_RO(type); |
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static ssize_t wakeup_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj); |
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ssize_t ret = 0; |
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raw_spin_lock_irq(&desc->lock); |
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ret = sprintf(buf, "%s\n", |
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irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled"); |
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raw_spin_unlock_irq(&desc->lock); |
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return ret; |
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} |
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IRQ_ATTR_RO(wakeup); |
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static ssize_t name_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj); |
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ssize_t ret = 0; |
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raw_spin_lock_irq(&desc->lock); |
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if (desc->name) |
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ret = scnprintf(buf, PAGE_SIZE, "%s\n", desc->name); |
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raw_spin_unlock_irq(&desc->lock); |
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return ret; |
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} |
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IRQ_ATTR_RO(name); |
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static ssize_t actions_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj); |
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struct irqaction *action; |
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ssize_t ret = 0; |
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char *p = ""; |
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raw_spin_lock_irq(&desc->lock); |
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for (action = desc->action; action != NULL; action = action->next) { |
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ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s", |
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p, action->name); |
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p = ","; |
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} |
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raw_spin_unlock_irq(&desc->lock); |
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if (ret) |
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ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); |
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return ret; |
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} |
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IRQ_ATTR_RO(actions); |
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static struct attribute *irq_attrs[] = { |
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&per_cpu_count_attr.attr, |
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&chip_name_attr.attr, |
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&hwirq_attr.attr, |
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&type_attr.attr, |
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&wakeup_attr.attr, |
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&name_attr.attr, |
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&actions_attr.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(irq); |
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static struct kobj_type irq_kobj_type = { |
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.release = irq_kobj_release, |
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.sysfs_ops = &kobj_sysfs_ops, |
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.default_groups = irq_groups, |
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}; |
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static void irq_sysfs_add(int irq, struct irq_desc *desc) |
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{ |
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if (irq_kobj_base) { |
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/* |
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* Continue even in case of failure as this is nothing |
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* crucial. |
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*/ |
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if (kobject_add(&desc->kobj, irq_kobj_base, "%d", irq)) |
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pr_warn("Failed to add kobject for irq %d\n", irq); |
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} |
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} |
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static void irq_sysfs_del(struct irq_desc *desc) |
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{ |
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/* |
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* If irq_sysfs_init() has not yet been invoked (early boot), then |
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* irq_kobj_base is NULL and the descriptor was never added. |
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* kobject_del() complains about a object with no parent, so make |
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* it conditional. |
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*/ |
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if (irq_kobj_base) |
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kobject_del(&desc->kobj); |
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} |
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static int __init irq_sysfs_init(void) |
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{ |
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struct irq_desc *desc; |
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int irq; |
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/* Prevent concurrent irq alloc/free */ |
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irq_lock_sparse(); |
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irq_kobj_base = kobject_create_and_add("irq", kernel_kobj); |
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if (!irq_kobj_base) { |
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irq_unlock_sparse(); |
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return -ENOMEM; |
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} |
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/* Add the already allocated interrupts */ |
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for_each_irq_desc(irq, desc) |
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irq_sysfs_add(irq, desc); |
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irq_unlock_sparse(); |
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return 0; |
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} |
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postcore_initcall(irq_sysfs_init); |
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#else /* !CONFIG_SYSFS */ |
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static struct kobj_type irq_kobj_type = { |
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.release = irq_kobj_release, |
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}; |
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static void irq_sysfs_add(int irq, struct irq_desc *desc) {} |
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static void irq_sysfs_del(struct irq_desc *desc) {} |
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#endif /* CONFIG_SYSFS */ |
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static RADIX_TREE(irq_desc_tree, GFP_KERNEL); |
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static void irq_insert_desc(unsigned int irq, struct irq_desc *desc) |
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{ |
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radix_tree_insert(&irq_desc_tree, irq, desc); |
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} |
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struct irq_desc *irq_to_desc(unsigned int irq) |
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{ |
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return radix_tree_lookup(&irq_desc_tree, irq); |
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} |
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#ifdef CONFIG_KVM_BOOK3S_64_HV_MODULE |
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EXPORT_SYMBOL_GPL(irq_to_desc); |
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#endif |
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static void delete_irq_desc(unsigned int irq) |
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{ |
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radix_tree_delete(&irq_desc_tree, irq); |
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} |
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#ifdef CONFIG_SMP |
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static void free_masks(struct irq_desc *desc) |
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{ |
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#ifdef CONFIG_GENERIC_PENDING_IRQ |
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free_cpumask_var(desc->pending_mask); |
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#endif |
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free_cpumask_var(desc->irq_common_data.affinity); |
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#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK |
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free_cpumask_var(desc->irq_common_data.effective_affinity); |
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#endif |
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} |
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#else |
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static inline void free_masks(struct irq_desc *desc) { } |
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#endif |
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void irq_lock_sparse(void) |
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{ |
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mutex_lock(&sparse_irq_lock); |
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} |
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void irq_unlock_sparse(void) |
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{ |
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mutex_unlock(&sparse_irq_lock); |
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} |
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static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags, |
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const struct cpumask *affinity, |
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struct module *owner) |
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{ |
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struct irq_desc *desc; |
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desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node); |
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if (!desc) |
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return NULL; |
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/* allocate based on nr_cpu_ids */ |
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desc->kstat_irqs = alloc_percpu(unsigned int); |
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if (!desc->kstat_irqs) |
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goto err_desc; |
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if (alloc_masks(desc, node)) |
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goto err_kstat; |
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raw_spin_lock_init(&desc->lock); |
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lockdep_set_class(&desc->lock, &irq_desc_lock_class); |
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mutex_init(&desc->request_mutex); |
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init_rcu_head(&desc->rcu); |
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desc_set_defaults(irq, desc, node, affinity, owner); |
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irqd_set(&desc->irq_data, flags); |
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kobject_init(&desc->kobj, &irq_kobj_type); |
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return desc; |
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err_kstat: |
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free_percpu(desc->kstat_irqs); |
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err_desc: |
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kfree(desc); |
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return NULL; |
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} |
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static void irq_kobj_release(struct kobject *kobj) |
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{ |
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struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj); |
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free_masks(desc); |
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free_percpu(desc->kstat_irqs); |
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kfree(desc); |
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} |
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static void delayed_free_desc(struct rcu_head *rhp) |
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{ |
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struct irq_desc *desc = container_of(rhp, struct irq_desc, rcu); |
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kobject_put(&desc->kobj); |
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} |
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static void free_desc(unsigned int irq) |
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{ |
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struct irq_desc *desc = irq_to_desc(irq); |
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irq_remove_debugfs_entry(desc); |
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unregister_irq_proc(irq, desc); |
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/* |
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* sparse_irq_lock protects also show_interrupts() and |
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* kstat_irq_usr(). Once we deleted the descriptor from the |
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* sparse tree we can free it. Access in proc will fail to |
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* lookup the descriptor. |
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* |
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* The sysfs entry must be serialized against a concurrent |
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* irq_sysfs_init() as well. |
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*/ |
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irq_sysfs_del(desc); |
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delete_irq_desc(irq); |
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/* |
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* We free the descriptor, masks and stat fields via RCU. That |
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* allows demultiplex interrupts to do rcu based management of |
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* the child interrupts. |
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* This also allows us to use rcu in kstat_irqs_usr(). |
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*/ |
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call_rcu(&desc->rcu, delayed_free_desc); |
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} |
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static int alloc_descs(unsigned int start, unsigned int cnt, int node, |
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const struct irq_affinity_desc *affinity, |
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struct module *owner) |
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{ |
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struct irq_desc *desc; |
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int i; |
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|
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/* Validate affinity mask(s) */ |
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if (affinity) { |
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for (i = 0; i < cnt; i++) { |
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if (cpumask_empty(&affinity[i].mask)) |
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return -EINVAL; |
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} |
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} |
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for (i = 0; i < cnt; i++) { |
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const struct cpumask *mask = NULL; |
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unsigned int flags = 0; |
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if (affinity) { |
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if (affinity->is_managed) { |
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flags = IRQD_AFFINITY_MANAGED | |
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IRQD_MANAGED_SHUTDOWN; |
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} |
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mask = &affinity->mask; |
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node = cpu_to_node(cpumask_first(mask)); |
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affinity++; |
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} |
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desc = alloc_desc(start + i, node, flags, mask, owner); |
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if (!desc) |
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goto err; |
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irq_insert_desc(start + i, desc); |
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irq_sysfs_add(start + i, desc); |
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irq_add_debugfs_entry(start + i, desc); |
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} |
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bitmap_set(allocated_irqs, start, cnt); |
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return start; |
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err: |
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for (i--; i >= 0; i--) |
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free_desc(start + i); |
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return -ENOMEM; |
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} |
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static int irq_expand_nr_irqs(unsigned int nr) |
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{ |
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if (nr > IRQ_BITMAP_BITS) |
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return -ENOMEM; |
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nr_irqs = nr; |
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return 0; |
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} |
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|
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int __init early_irq_init(void) |
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{ |
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int i, initcnt, node = first_online_node; |
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struct irq_desc *desc; |
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init_irq_default_affinity(); |
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|
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/* Let arch update nr_irqs and return the nr of preallocated irqs */ |
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initcnt = arch_probe_nr_irqs(); |
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printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n", |
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NR_IRQS, nr_irqs, initcnt); |
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if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS)) |
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nr_irqs = IRQ_BITMAP_BITS; |
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if (WARN_ON(initcnt > IRQ_BITMAP_BITS)) |
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initcnt = IRQ_BITMAP_BITS; |
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if (initcnt > nr_irqs) |
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nr_irqs = initcnt; |
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for (i = 0; i < initcnt; i++) { |
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desc = alloc_desc(i, node, 0, NULL, NULL); |
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set_bit(i, allocated_irqs); |
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irq_insert_desc(i, desc); |
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} |
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return arch_early_irq_init(); |
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} |
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#else /* !CONFIG_SPARSE_IRQ */ |
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struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = { |
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[0 ... NR_IRQS-1] = { |
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.handle_irq = handle_bad_irq, |
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.depth = 1, |
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.lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock), |
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} |
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}; |
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|
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int __init early_irq_init(void) |
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{ |
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int count, i, node = first_online_node; |
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struct irq_desc *desc; |
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|
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init_irq_default_affinity(); |
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|
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printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS); |
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desc = irq_desc; |
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count = ARRAY_SIZE(irq_desc); |
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|
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for (i = 0; i < count; i++) { |
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desc[i].kstat_irqs = alloc_percpu(unsigned int); |
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alloc_masks(&desc[i], node); |
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raw_spin_lock_init(&desc[i].lock); |
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lockdep_set_class(&desc[i].lock, &irq_desc_lock_class); |
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mutex_init(&desc[i].request_mutex); |
|
desc_set_defaults(i, &desc[i], node, NULL, NULL); |
|
} |
|
return arch_early_irq_init(); |
|
} |
|
|
|
struct irq_desc *irq_to_desc(unsigned int irq) |
|
{ |
|
return (irq < NR_IRQS) ? irq_desc + irq : NULL; |
|
} |
|
EXPORT_SYMBOL(irq_to_desc); |
|
|
|
static void free_desc(unsigned int irq) |
|
{ |
|
struct irq_desc *desc = irq_to_desc(irq); |
|
unsigned long flags; |
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags); |
|
desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL); |
|
raw_spin_unlock_irqrestore(&desc->lock, flags); |
|
} |
|
|
|
static inline int alloc_descs(unsigned int start, unsigned int cnt, int node, |
|
const struct irq_affinity_desc *affinity, |
|
struct module *owner) |
|
{ |
|
u32 i; |
|
|
|
for (i = 0; i < cnt; i++) { |
|
struct irq_desc *desc = irq_to_desc(start + i); |
|
|
|
desc->owner = owner; |
|
} |
|
bitmap_set(allocated_irqs, start, cnt); |
|
return start; |
|
} |
|
|
|
static int irq_expand_nr_irqs(unsigned int nr) |
|
{ |
|
return -ENOMEM; |
|
} |
|
|
|
void irq_mark_irq(unsigned int irq) |
|
{ |
|
mutex_lock(&sparse_irq_lock); |
|
bitmap_set(allocated_irqs, irq, 1); |
|
mutex_unlock(&sparse_irq_lock); |
|
} |
|
|
|
#ifdef CONFIG_GENERIC_IRQ_LEGACY |
|
void irq_init_desc(unsigned int irq) |
|
{ |
|
free_desc(irq); |
|
} |
|
#endif |
|
|
|
#endif /* !CONFIG_SPARSE_IRQ */ |
|
|
|
int handle_irq_desc(struct irq_desc *desc) |
|
{ |
|
struct irq_data *data; |
|
|
|
if (!desc) |
|
return -EINVAL; |
|
|
|
data = irq_desc_get_irq_data(desc); |
|
if (WARN_ON_ONCE(!in_irq() && handle_enforce_irqctx(data))) |
|
return -EPERM; |
|
|
|
generic_handle_irq_desc(desc); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(handle_irq_desc); |
|
|
|
/** |
|
* generic_handle_irq - Invoke the handler for a particular irq |
|
* @irq: The irq number to handle |
|
* |
|
*/ |
|
int generic_handle_irq(unsigned int irq) |
|
{ |
|
return handle_irq_desc(irq_to_desc(irq)); |
|
} |
|
EXPORT_SYMBOL_GPL(generic_handle_irq); |
|
|
|
#ifdef CONFIG_IRQ_DOMAIN |
|
/** |
|
* generic_handle_domain_irq - Invoke the handler for a HW irq belonging |
|
* to a domain, usually for a non-root interrupt |
|
* controller |
|
* @domain: The domain where to perform the lookup |
|
* @hwirq: The HW irq number to convert to a logical one |
|
* |
|
* Returns: 0 on success, or -EINVAL if conversion has failed |
|
* |
|
*/ |
|
int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq) |
|
{ |
|
return handle_irq_desc(irq_resolve_mapping(domain, hwirq)); |
|
} |
|
EXPORT_SYMBOL_GPL(generic_handle_domain_irq); |
|
|
|
#ifdef CONFIG_HANDLE_DOMAIN_IRQ |
|
/** |
|
* handle_domain_irq - Invoke the handler for a HW irq belonging to a domain, |
|
* usually for a root interrupt controller |
|
* @domain: The domain where to perform the lookup |
|
* @hwirq: The HW irq number to convert to a logical one |
|
* @regs: Register file coming from the low-level handling code |
|
* |
|
* Returns: 0 on success, or -EINVAL if conversion has failed |
|
*/ |
|
int handle_domain_irq(struct irq_domain *domain, |
|
unsigned int hwirq, struct pt_regs *regs) |
|
{ |
|
struct pt_regs *old_regs = set_irq_regs(regs); |
|
struct irq_desc *desc; |
|
int ret = 0; |
|
|
|
irq_enter(); |
|
|
|
/* The irqdomain code provides boundary checks */ |
|
desc = irq_resolve_mapping(domain, hwirq); |
|
if (likely(desc)) |
|
handle_irq_desc(desc); |
|
else |
|
ret = -EINVAL; |
|
|
|
irq_exit(); |
|
set_irq_regs(old_regs); |
|
return ret; |
|
} |
|
|
|
/** |
|
* handle_domain_nmi - Invoke the handler for a HW irq belonging to a domain |
|
* @domain: The domain where to perform the lookup |
|
* @hwirq: The HW irq number to convert to a logical one |
|
* @regs: Register file coming from the low-level handling code |
|
* |
|
* This function must be called from an NMI context. |
|
* |
|
* Returns: 0 on success, or -EINVAL if conversion has failed |
|
*/ |
|
int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq, |
|
struct pt_regs *regs) |
|
{ |
|
struct pt_regs *old_regs = set_irq_regs(regs); |
|
struct irq_desc *desc; |
|
int ret = 0; |
|
|
|
/* |
|
* NMI context needs to be setup earlier in order to deal with tracing. |
|
*/ |
|
WARN_ON(!in_nmi()); |
|
|
|
desc = irq_resolve_mapping(domain, hwirq); |
|
|
|
/* |
|
* ack_bad_irq is not NMI-safe, just report |
|
* an invalid interrupt. |
|
*/ |
|
if (likely(desc)) |
|
handle_irq_desc(desc); |
|
else |
|
ret = -EINVAL; |
|
|
|
set_irq_regs(old_regs); |
|
return ret; |
|
} |
|
#endif |
|
#endif |
|
|
|
/* Dynamic interrupt handling */ |
|
|
|
/** |
|
* irq_free_descs - free irq descriptors |
|
* @from: Start of descriptor range |
|
* @cnt: Number of consecutive irqs to free |
|
*/ |
|
void irq_free_descs(unsigned int from, unsigned int cnt) |
|
{ |
|
int i; |
|
|
|
if (from >= nr_irqs || (from + cnt) > nr_irqs) |
|
return; |
|
|
|
mutex_lock(&sparse_irq_lock); |
|
for (i = 0; i < cnt; i++) |
|
free_desc(from + i); |
|
|
|
bitmap_clear(allocated_irqs, from, cnt); |
|
mutex_unlock(&sparse_irq_lock); |
|
} |
|
EXPORT_SYMBOL_GPL(irq_free_descs); |
|
|
|
/** |
|
* __irq_alloc_descs - allocate and initialize a range of irq descriptors |
|
* @irq: Allocate for specific irq number if irq >= 0 |
|
* @from: Start the search from this irq number |
|
* @cnt: Number of consecutive irqs to allocate. |
|
* @node: Preferred node on which the irq descriptor should be allocated |
|
* @owner: Owning module (can be NULL) |
|
* @affinity: Optional pointer to an affinity mask array of size @cnt which |
|
* hints where the irq descriptors should be allocated and which |
|
* default affinities to use |
|
* |
|
* Returns the first irq number or error code |
|
*/ |
|
int __ref |
|
__irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node, |
|
struct module *owner, const struct irq_affinity_desc *affinity) |
|
{ |
|
int start, ret; |
|
|
|
if (!cnt) |
|
return -EINVAL; |
|
|
|
if (irq >= 0) { |
|
if (from > irq) |
|
return -EINVAL; |
|
from = irq; |
|
} else { |
|
/* |
|
* For interrupts which are freely allocated the |
|
* architecture can force a lower bound to the @from |
|
* argument. x86 uses this to exclude the GSI space. |
|
*/ |
|
from = arch_dynirq_lower_bound(from); |
|
} |
|
|
|
mutex_lock(&sparse_irq_lock); |
|
|
|
start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS, |
|
from, cnt, 0); |
|
ret = -EEXIST; |
|
if (irq >=0 && start != irq) |
|
goto unlock; |
|
|
|
if (start + cnt > nr_irqs) { |
|
ret = irq_expand_nr_irqs(start + cnt); |
|
if (ret) |
|
goto unlock; |
|
} |
|
ret = alloc_descs(start, cnt, node, affinity, owner); |
|
unlock: |
|
mutex_unlock(&sparse_irq_lock); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(__irq_alloc_descs); |
|
|
|
/** |
|
* irq_get_next_irq - get next allocated irq number |
|
* @offset: where to start the search |
|
* |
|
* Returns next irq number after offset or nr_irqs if none is found. |
|
*/ |
|
unsigned int irq_get_next_irq(unsigned int offset) |
|
{ |
|
return find_next_bit(allocated_irqs, nr_irqs, offset); |
|
} |
|
|
|
struct irq_desc * |
|
__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, |
|
unsigned int check) |
|
{ |
|
struct irq_desc *desc = irq_to_desc(irq); |
|
|
|
if (desc) { |
|
if (check & _IRQ_DESC_CHECK) { |
|
if ((check & _IRQ_DESC_PERCPU) && |
|
!irq_settings_is_per_cpu_devid(desc)) |
|
return NULL; |
|
|
|
if (!(check & _IRQ_DESC_PERCPU) && |
|
irq_settings_is_per_cpu_devid(desc)) |
|
return NULL; |
|
} |
|
|
|
if (bus) |
|
chip_bus_lock(desc); |
|
raw_spin_lock_irqsave(&desc->lock, *flags); |
|
} |
|
return desc; |
|
} |
|
|
|
void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus) |
|
__releases(&desc->lock) |
|
{ |
|
raw_spin_unlock_irqrestore(&desc->lock, flags); |
|
if (bus) |
|
chip_bus_sync_unlock(desc); |
|
} |
|
|
|
int irq_set_percpu_devid_partition(unsigned int irq, |
|
const struct cpumask *affinity) |
|
{ |
|
struct irq_desc *desc = irq_to_desc(irq); |
|
|
|
if (!desc) |
|
return -EINVAL; |
|
|
|
if (desc->percpu_enabled) |
|
return -EINVAL; |
|
|
|
desc->percpu_enabled = kzalloc(sizeof(*desc->percpu_enabled), GFP_KERNEL); |
|
|
|
if (!desc->percpu_enabled) |
|
return -ENOMEM; |
|
|
|
if (affinity) |
|
desc->percpu_affinity = affinity; |
|
else |
|
desc->percpu_affinity = cpu_possible_mask; |
|
|
|
irq_set_percpu_devid_flags(irq); |
|
return 0; |
|
} |
|
|
|
int irq_set_percpu_devid(unsigned int irq) |
|
{ |
|
return irq_set_percpu_devid_partition(irq, NULL); |
|
} |
|
|
|
int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity) |
|
{ |
|
struct irq_desc *desc = irq_to_desc(irq); |
|
|
|
if (!desc || !desc->percpu_enabled) |
|
return -EINVAL; |
|
|
|
if (affinity) |
|
cpumask_copy(affinity, desc->percpu_affinity); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition); |
|
|
|
void kstat_incr_irq_this_cpu(unsigned int irq) |
|
{ |
|
kstat_incr_irqs_this_cpu(irq_to_desc(irq)); |
|
} |
|
|
|
/** |
|
* kstat_irqs_cpu - Get the statistics for an interrupt on a cpu |
|
* @irq: The interrupt number |
|
* @cpu: The cpu number |
|
* |
|
* Returns the sum of interrupt counts on @cpu since boot for |
|
* @irq. The caller must ensure that the interrupt is not removed |
|
* concurrently. |
|
*/ |
|
unsigned int kstat_irqs_cpu(unsigned int irq, int cpu) |
|
{ |
|
struct irq_desc *desc = irq_to_desc(irq); |
|
|
|
return desc && desc->kstat_irqs ? |
|
*per_cpu_ptr(desc->kstat_irqs, cpu) : 0; |
|
} |
|
|
|
static bool irq_is_nmi(struct irq_desc *desc) |
|
{ |
|
return desc->istate & IRQS_NMI; |
|
} |
|
|
|
static unsigned int kstat_irqs(unsigned int irq) |
|
{ |
|
struct irq_desc *desc = irq_to_desc(irq); |
|
unsigned int sum = 0; |
|
int cpu; |
|
|
|
if (!desc || !desc->kstat_irqs) |
|
return 0; |
|
if (!irq_settings_is_per_cpu_devid(desc) && |
|
!irq_settings_is_per_cpu(desc) && |
|
!irq_is_nmi(desc)) |
|
return data_race(desc->tot_count); |
|
|
|
for_each_possible_cpu(cpu) |
|
sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu)); |
|
return sum; |
|
} |
|
|
|
/** |
|
* kstat_irqs_usr - Get the statistics for an interrupt from thread context |
|
* @irq: The interrupt number |
|
* |
|
* Returns the sum of interrupt counts on all cpus since boot for @irq. |
|
* |
|
* It uses rcu to protect the access since a concurrent removal of an |
|
* interrupt descriptor is observing an rcu grace period before |
|
* delayed_free_desc()/irq_kobj_release(). |
|
*/ |
|
unsigned int kstat_irqs_usr(unsigned int irq) |
|
{ |
|
unsigned int sum; |
|
|
|
rcu_read_lock(); |
|
sum = kstat_irqs(irq); |
|
rcu_read_unlock(); |
|
return sum; |
|
} |
|
|
|
#ifdef CONFIG_LOCKDEP |
|
void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class, |
|
struct lock_class_key *request_class) |
|
{ |
|
struct irq_desc *desc = irq_to_desc(irq); |
|
|
|
if (desc) { |
|
lockdep_set_class(&desc->lock, lock_class); |
|
lockdep_set_class(&desc->request_mutex, request_class); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(__irq_set_lockdep_class); |
|
#endif
|
|
|