![Jonathan Cameron](/assets/img/avatar_default.png)
Export handle_simple_irq, irq_modify_status, irq_alloc_descs, irq_free_descs and generic_handle_irq to allow their usage in modules. First user is IIO, which wants to be built modular, but needs to be able to create irq chips, allocate and configure interrupt descriptors and handle demultiplexing interrupts. [ tglx: Moved the uninlinig of generic_handle_irq to a separate patch ] Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk> Link: http://lkml.kernel.org/r/%3C1305711544-505-1-git-send-email-jic23%40cam.ac.uk%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
678 lines
16 KiB
C
678 lines
16 KiB
C
/*
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* linux/kernel/irq/chip.c
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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 core interrupt handling code, for irq-chip
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* based architectures.
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*
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* Detailed information is available in Documentation/DocBook/genericirq
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*/
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#include <linux/irq.h>
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#include <linux/msi.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include "internals.h"
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/**
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* irq_set_chip - set the irq chip for an irq
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* @irq: irq number
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* @chip: pointer to irq chip description structure
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*/
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int irq_set_chip(unsigned int irq, struct irq_chip *chip)
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{
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unsigned long flags;
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struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
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if (!desc)
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return -EINVAL;
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if (!chip)
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chip = &no_irq_chip;
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desc->irq_data.chip = chip;
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irq_put_desc_unlock(desc, flags);
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/*
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* For !CONFIG_SPARSE_IRQ make the irq show up in
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* allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
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* already marked, and this call is harmless.
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*/
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irq_reserve_irq(irq);
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return 0;
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}
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EXPORT_SYMBOL(irq_set_chip);
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/**
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* irq_set_type - set the irq trigger type for an irq
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* @irq: irq number
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* @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
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*/
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int irq_set_irq_type(unsigned int irq, unsigned int type)
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{
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unsigned long flags;
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struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
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int ret = 0;
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if (!desc)
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return -EINVAL;
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type &= IRQ_TYPE_SENSE_MASK;
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if (type != IRQ_TYPE_NONE)
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ret = __irq_set_trigger(desc, irq, type);
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irq_put_desc_busunlock(desc, flags);
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return ret;
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}
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EXPORT_SYMBOL(irq_set_irq_type);
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/**
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* irq_set_handler_data - set irq handler data for an irq
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* @irq: Interrupt number
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* @data: Pointer to interrupt specific data
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*
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* Set the hardware irq controller data for an irq
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*/
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int irq_set_handler_data(unsigned int irq, void *data)
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{
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unsigned long flags;
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struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
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if (!desc)
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return -EINVAL;
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desc->irq_data.handler_data = data;
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irq_put_desc_unlock(desc, flags);
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return 0;
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}
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EXPORT_SYMBOL(irq_set_handler_data);
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/**
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* irq_set_msi_desc - set MSI descriptor data for an irq
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* @irq: Interrupt number
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* @entry: Pointer to MSI descriptor data
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*
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* Set the MSI descriptor entry for an irq
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*/
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int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry)
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{
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unsigned long flags;
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struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
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if (!desc)
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return -EINVAL;
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desc->irq_data.msi_desc = entry;
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if (entry)
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entry->irq = irq;
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irq_put_desc_unlock(desc, flags);
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return 0;
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}
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/**
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* irq_set_chip_data - set irq chip data for an irq
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* @irq: Interrupt number
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* @data: Pointer to chip specific data
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*
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* Set the hardware irq chip data for an irq
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*/
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int irq_set_chip_data(unsigned int irq, void *data)
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{
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unsigned long flags;
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struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
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if (!desc)
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return -EINVAL;
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desc->irq_data.chip_data = data;
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irq_put_desc_unlock(desc, flags);
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return 0;
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}
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EXPORT_SYMBOL(irq_set_chip_data);
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struct irq_data *irq_get_irq_data(unsigned int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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return desc ? &desc->irq_data : NULL;
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}
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EXPORT_SYMBOL_GPL(irq_get_irq_data);
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static void irq_state_clr_disabled(struct irq_desc *desc)
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{
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irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
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}
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static void irq_state_set_disabled(struct irq_desc *desc)
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{
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irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
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}
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static void irq_state_clr_masked(struct irq_desc *desc)
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{
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irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
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}
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static void irq_state_set_masked(struct irq_desc *desc)
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{
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irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
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}
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int irq_startup(struct irq_desc *desc)
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{
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irq_state_clr_disabled(desc);
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desc->depth = 0;
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if (desc->irq_data.chip->irq_startup) {
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int ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
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irq_state_clr_masked(desc);
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return ret;
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}
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irq_enable(desc);
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return 0;
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}
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void irq_shutdown(struct irq_desc *desc)
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{
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irq_state_set_disabled(desc);
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desc->depth = 1;
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if (desc->irq_data.chip->irq_shutdown)
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desc->irq_data.chip->irq_shutdown(&desc->irq_data);
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if (desc->irq_data.chip->irq_disable)
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desc->irq_data.chip->irq_disable(&desc->irq_data);
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else
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desc->irq_data.chip->irq_mask(&desc->irq_data);
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irq_state_set_masked(desc);
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}
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void irq_enable(struct irq_desc *desc)
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{
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irq_state_clr_disabled(desc);
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if (desc->irq_data.chip->irq_enable)
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desc->irq_data.chip->irq_enable(&desc->irq_data);
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else
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desc->irq_data.chip->irq_unmask(&desc->irq_data);
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irq_state_clr_masked(desc);
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}
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void irq_disable(struct irq_desc *desc)
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{
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irq_state_set_disabled(desc);
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if (desc->irq_data.chip->irq_disable) {
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desc->irq_data.chip->irq_disable(&desc->irq_data);
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irq_state_set_masked(desc);
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}
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}
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static inline void mask_ack_irq(struct irq_desc *desc)
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{
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if (desc->irq_data.chip->irq_mask_ack)
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desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
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else {
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desc->irq_data.chip->irq_mask(&desc->irq_data);
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if (desc->irq_data.chip->irq_ack)
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desc->irq_data.chip->irq_ack(&desc->irq_data);
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}
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irq_state_set_masked(desc);
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}
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void mask_irq(struct irq_desc *desc)
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{
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if (desc->irq_data.chip->irq_mask) {
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desc->irq_data.chip->irq_mask(&desc->irq_data);
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irq_state_set_masked(desc);
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}
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}
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void unmask_irq(struct irq_desc *desc)
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{
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if (desc->irq_data.chip->irq_unmask) {
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desc->irq_data.chip->irq_unmask(&desc->irq_data);
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irq_state_clr_masked(desc);
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}
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}
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/*
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* handle_nested_irq - Handle a nested irq from a irq thread
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* @irq: the interrupt number
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*
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* Handle interrupts which are nested into a threaded interrupt
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* handler. The handler function is called inside the calling
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* threads context.
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*/
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void handle_nested_irq(unsigned int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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struct irqaction *action;
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irqreturn_t action_ret;
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might_sleep();
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raw_spin_lock_irq(&desc->lock);
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kstat_incr_irqs_this_cpu(irq, desc);
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action = desc->action;
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if (unlikely(!action || irqd_irq_disabled(&desc->irq_data)))
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goto out_unlock;
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irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
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raw_spin_unlock_irq(&desc->lock);
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action_ret = action->thread_fn(action->irq, action->dev_id);
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if (!noirqdebug)
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note_interrupt(irq, desc, action_ret);
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raw_spin_lock_irq(&desc->lock);
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irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
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out_unlock:
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raw_spin_unlock_irq(&desc->lock);
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}
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EXPORT_SYMBOL_GPL(handle_nested_irq);
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static bool irq_check_poll(struct irq_desc *desc)
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{
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if (!(desc->istate & IRQS_POLL_INPROGRESS))
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return false;
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return irq_wait_for_poll(desc);
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}
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/**
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* handle_simple_irq - Simple and software-decoded IRQs.
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* @irq: the interrupt number
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* @desc: the interrupt description structure for this irq
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*
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* Simple interrupts are either sent from a demultiplexing interrupt
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* handler or come from hardware, where no interrupt hardware control
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* is necessary.
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*
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* Note: The caller is expected to handle the ack, clear, mask and
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* unmask issues if necessary.
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*/
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void
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handle_simple_irq(unsigned int irq, struct irq_desc *desc)
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{
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raw_spin_lock(&desc->lock);
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if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
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if (!irq_check_poll(desc))
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goto out_unlock;
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desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
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kstat_incr_irqs_this_cpu(irq, desc);
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if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
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goto out_unlock;
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handle_irq_event(desc);
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out_unlock:
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raw_spin_unlock(&desc->lock);
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}
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EXPORT_SYMBOL_GPL(handle_simple_irq);
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/**
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* handle_level_irq - Level type irq handler
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* @irq: the interrupt number
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* @desc: the interrupt description structure for this irq
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*
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* Level type interrupts are active as long as the hardware line has
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* the active level. This may require to mask the interrupt and unmask
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* it after the associated handler has acknowledged the device, so the
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* interrupt line is back to inactive.
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*/
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void
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handle_level_irq(unsigned int irq, struct irq_desc *desc)
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{
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raw_spin_lock(&desc->lock);
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mask_ack_irq(desc);
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if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
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if (!irq_check_poll(desc))
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goto out_unlock;
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desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
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kstat_incr_irqs_this_cpu(irq, desc);
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/*
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* If its disabled or no action available
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* keep it masked and get out of here
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*/
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if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
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goto out_unlock;
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handle_irq_event(desc);
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if (!irqd_irq_disabled(&desc->irq_data) && !(desc->istate & IRQS_ONESHOT))
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unmask_irq(desc);
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out_unlock:
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raw_spin_unlock(&desc->lock);
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}
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EXPORT_SYMBOL_GPL(handle_level_irq);
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#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
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static inline void preflow_handler(struct irq_desc *desc)
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{
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if (desc->preflow_handler)
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desc->preflow_handler(&desc->irq_data);
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}
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#else
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static inline void preflow_handler(struct irq_desc *desc) { }
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#endif
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/**
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* handle_fasteoi_irq - irq handler for transparent controllers
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* @irq: the interrupt number
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* @desc: the interrupt description structure for this irq
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*
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* Only a single callback will be issued to the chip: an ->eoi()
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* call when the interrupt has been serviced. This enables support
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* for modern forms of interrupt handlers, which handle the flow
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* details in hardware, transparently.
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*/
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void
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handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
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{
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raw_spin_lock(&desc->lock);
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if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
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if (!irq_check_poll(desc))
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goto out;
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desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
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kstat_incr_irqs_this_cpu(irq, desc);
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/*
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* If its disabled or no action available
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* then mask it and get out of here:
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*/
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if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
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desc->istate |= IRQS_PENDING;
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mask_irq(desc);
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goto out;
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}
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if (desc->istate & IRQS_ONESHOT)
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mask_irq(desc);
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preflow_handler(desc);
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handle_irq_event(desc);
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out_eoi:
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desc->irq_data.chip->irq_eoi(&desc->irq_data);
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out_unlock:
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raw_spin_unlock(&desc->lock);
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return;
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out:
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if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
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goto out_eoi;
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goto out_unlock;
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}
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/**
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* handle_edge_irq - edge type IRQ handler
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* @irq: the interrupt number
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* @desc: the interrupt description structure for this irq
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*
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* Interrupt occures on the falling and/or rising edge of a hardware
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* signal. The occurrence is latched into the irq controller hardware
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* and must be acked in order to be reenabled. After the ack another
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* interrupt can happen on the same source even before the first one
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* is handled by the associated event handler. If this happens it
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* might be necessary to disable (mask) the interrupt depending on the
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* controller hardware. This requires to reenable the interrupt inside
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* of the loop which handles the interrupts which have arrived while
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* the handler was running. If all pending interrupts are handled, the
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* loop is left.
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*/
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void
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handle_edge_irq(unsigned int irq, struct irq_desc *desc)
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{
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raw_spin_lock(&desc->lock);
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desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
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/*
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* If we're currently running this IRQ, or its disabled,
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* we shouldn't process the IRQ. Mark it pending, handle
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* the necessary masking and go out
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*/
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if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
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irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
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if (!irq_check_poll(desc)) {
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desc->istate |= IRQS_PENDING;
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mask_ack_irq(desc);
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goto out_unlock;
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}
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}
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kstat_incr_irqs_this_cpu(irq, desc);
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/* Start handling the irq */
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desc->irq_data.chip->irq_ack(&desc->irq_data);
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do {
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if (unlikely(!desc->action)) {
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mask_irq(desc);
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goto out_unlock;
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}
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/*
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* When another irq arrived while we were handling
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* one, we could have masked the irq.
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* Renable it, if it was not disabled in meantime.
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*/
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if (unlikely(desc->istate & IRQS_PENDING)) {
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if (!irqd_irq_disabled(&desc->irq_data) &&
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irqd_irq_masked(&desc->irq_data))
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unmask_irq(desc);
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}
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handle_irq_event(desc);
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} while ((desc->istate & IRQS_PENDING) &&
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!irqd_irq_disabled(&desc->irq_data));
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out_unlock:
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raw_spin_unlock(&desc->lock);
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}
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#ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
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/**
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* handle_edge_eoi_irq - edge eoi type IRQ handler
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* @irq: the interrupt number
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* @desc: the interrupt description structure for this irq
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*
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* Similar as the above handle_edge_irq, but using eoi and w/o the
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* mask/unmask logic.
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*/
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void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)
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{
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struct irq_chip *chip = irq_desc_get_chip(desc);
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raw_spin_lock(&desc->lock);
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desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
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/*
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* If we're currently running this IRQ, or its disabled,
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* we shouldn't process the IRQ. Mark it pending, handle
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* the necessary masking and go out
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*/
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if (unlikely(irqd_irq_disabled(&desc->irq_data) ||
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irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {
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if (!irq_check_poll(desc)) {
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desc->istate |= IRQS_PENDING;
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goto out_eoi;
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}
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}
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kstat_incr_irqs_this_cpu(irq, desc);
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do {
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if (unlikely(!desc->action))
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goto out_eoi;
|
|
|
|
handle_irq_event(desc);
|
|
|
|
} while ((desc->istate & IRQS_PENDING) &&
|
|
!irqd_irq_disabled(&desc->irq_data));
|
|
|
|
out_eoi:
|
|
chip->irq_eoi(&desc->irq_data);
|
|
raw_spin_unlock(&desc->lock);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* handle_percpu_irq - Per CPU local irq handler
|
|
* @irq: the interrupt number
|
|
* @desc: the interrupt description structure for this irq
|
|
*
|
|
* Per CPU interrupts on SMP machines without locking requirements
|
|
*/
|
|
void
|
|
handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
struct irq_chip *chip = irq_desc_get_chip(desc);
|
|
|
|
kstat_incr_irqs_this_cpu(irq, desc);
|
|
|
|
if (chip->irq_ack)
|
|
chip->irq_ack(&desc->irq_data);
|
|
|
|
handle_irq_event_percpu(desc, desc->action);
|
|
|
|
if (chip->irq_eoi)
|
|
chip->irq_eoi(&desc->irq_data);
|
|
}
|
|
|
|
void
|
|
__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
|
|
const char *name)
|
|
{
|
|
unsigned long flags;
|
|
struct irq_desc *desc = irq_get_desc_buslock(irq, &flags);
|
|
|
|
if (!desc)
|
|
return;
|
|
|
|
if (!handle) {
|
|
handle = handle_bad_irq;
|
|
} else {
|
|
if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
|
|
goto out;
|
|
}
|
|
|
|
/* Uninstall? */
|
|
if (handle == handle_bad_irq) {
|
|
if (desc->irq_data.chip != &no_irq_chip)
|
|
mask_ack_irq(desc);
|
|
irq_state_set_disabled(desc);
|
|
desc->depth = 1;
|
|
}
|
|
desc->handle_irq = handle;
|
|
desc->name = name;
|
|
|
|
if (handle != handle_bad_irq && is_chained) {
|
|
irq_settings_set_noprobe(desc);
|
|
irq_settings_set_norequest(desc);
|
|
irq_settings_set_nothread(desc);
|
|
irq_startup(desc);
|
|
}
|
|
out:
|
|
irq_put_desc_busunlock(desc, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__irq_set_handler);
|
|
|
|
void
|
|
irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
|
|
irq_flow_handler_t handle, const char *name)
|
|
{
|
|
irq_set_chip(irq, chip);
|
|
__irq_set_handler(irq, handle, 0, name);
|
|
}
|
|
|
|
void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
|
|
{
|
|
unsigned long flags;
|
|
struct irq_desc *desc = irq_get_desc_lock(irq, &flags);
|
|
|
|
if (!desc)
|
|
return;
|
|
irq_settings_clr_and_set(desc, clr, set);
|
|
|
|
irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
|
|
IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
|
|
if (irq_settings_has_no_balance_set(desc))
|
|
irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
|
|
if (irq_settings_is_per_cpu(desc))
|
|
irqd_set(&desc->irq_data, IRQD_PER_CPU);
|
|
if (irq_settings_can_move_pcntxt(desc))
|
|
irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
|
|
if (irq_settings_is_level(desc))
|
|
irqd_set(&desc->irq_data, IRQD_LEVEL);
|
|
|
|
irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
|
|
|
|
irq_put_desc_unlock(desc, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_modify_status);
|
|
|
|
/**
|
|
* irq_cpu_online - Invoke all irq_cpu_online functions.
|
|
*
|
|
* Iterate through all irqs and invoke the chip.irq_cpu_online()
|
|
* for each.
|
|
*/
|
|
void irq_cpu_online(void)
|
|
{
|
|
struct irq_desc *desc;
|
|
struct irq_chip *chip;
|
|
unsigned long flags;
|
|
unsigned int irq;
|
|
|
|
for_each_active_irq(irq) {
|
|
desc = irq_to_desc(irq);
|
|
if (!desc)
|
|
continue;
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
|
|
chip = irq_data_get_irq_chip(&desc->irq_data);
|
|
if (chip && chip->irq_cpu_online &&
|
|
(!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
|
|
!irqd_irq_disabled(&desc->irq_data)))
|
|
chip->irq_cpu_online(&desc->irq_data);
|
|
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* irq_cpu_offline - Invoke all irq_cpu_offline functions.
|
|
*
|
|
* Iterate through all irqs and invoke the chip.irq_cpu_offline()
|
|
* for each.
|
|
*/
|
|
void irq_cpu_offline(void)
|
|
{
|
|
struct irq_desc *desc;
|
|
struct irq_chip *chip;
|
|
unsigned long flags;
|
|
unsigned int irq;
|
|
|
|
for_each_active_irq(irq) {
|
|
desc = irq_to_desc(irq);
|
|
if (!desc)
|
|
continue;
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
|
|
chip = irq_data_get_irq_chip(&desc->irq_data);
|
|
if (chip && chip->irq_cpu_offline &&
|
|
(!(chip->flags & IRQCHIP_ONOFFLINE_ENABLED) ||
|
|
!irqd_irq_disabled(&desc->irq_data)))
|
|
chip->irq_cpu_offline(&desc->irq_data);
|
|
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
}
|