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![Grant Likely](/assets/img/avatar_default.png)
Add the hardware interrupt number to the output of /proc/interrupts. It is often important to have access to the hardware interrupt number because it identifies exactly how an interrupt signal is wired up to the interrupt controller. This is especially important when using irq_domains since irq numbers get dynamically allocated in that case, and have no relation to the actual hardware number. Note: This output is currently conditional on whether or not the irq_domain pointer is set; however hwirq could still be used without irq_domain. It may be worthwhile to always output the hwirq number regardless of the domain pointer. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Olof Johansson <olof@lixom.net> Cc: Ben Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de>
484 lines
11 KiB
C
484 lines
11 KiB
C
/*
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* linux/kernel/irq/proc.c
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*
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* Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
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*
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* This file contains the /proc/irq/ handling code.
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*/
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#include <linux/irq.h>
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#include <linux/gfp.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.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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static struct proc_dir_entry *root_irq_dir;
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#ifdef CONFIG_SMP
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static int show_irq_affinity(int type, struct seq_file *m, void *v)
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{
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struct irq_desc *desc = irq_to_desc((long)m->private);
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const struct cpumask *mask = desc->irq_data.affinity;
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#ifdef CONFIG_GENERIC_PENDING_IRQ
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if (irqd_is_setaffinity_pending(&desc->irq_data))
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mask = desc->pending_mask;
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#endif
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if (type)
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seq_cpumask_list(m, mask);
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else
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seq_cpumask(m, mask);
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seq_putc(m, '\n');
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return 0;
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}
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static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
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{
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struct irq_desc *desc = irq_to_desc((long)m->private);
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unsigned long flags;
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cpumask_var_t mask;
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if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
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return -ENOMEM;
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raw_spin_lock_irqsave(&desc->lock, flags);
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if (desc->affinity_hint)
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cpumask_copy(mask, desc->affinity_hint);
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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seq_cpumask(m, mask);
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seq_putc(m, '\n');
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free_cpumask_var(mask);
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return 0;
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}
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#ifndef is_affinity_mask_valid
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#define is_affinity_mask_valid(val) 1
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#endif
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int no_irq_affinity;
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static int irq_affinity_proc_show(struct seq_file *m, void *v)
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{
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return show_irq_affinity(0, m, v);
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}
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static int irq_affinity_list_proc_show(struct seq_file *m, void *v)
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{
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return show_irq_affinity(1, m, v);
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}
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static ssize_t write_irq_affinity(int type, struct file *file,
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const char __user *buffer, size_t count, loff_t *pos)
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{
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unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
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cpumask_var_t new_value;
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int err;
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if (!irq_can_set_affinity(irq) || no_irq_affinity)
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return -EIO;
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if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
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return -ENOMEM;
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if (type)
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err = cpumask_parselist_user(buffer, count, new_value);
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else
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err = cpumask_parse_user(buffer, count, new_value);
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if (err)
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goto free_cpumask;
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if (!is_affinity_mask_valid(new_value)) {
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err = -EINVAL;
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goto free_cpumask;
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}
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/*
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* Do not allow disabling IRQs completely - it's a too easy
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* way to make the system unusable accidentally :-) At least
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* one online CPU still has to be targeted.
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*/
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if (!cpumask_intersects(new_value, cpu_online_mask)) {
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/* Special case for empty set - allow the architecture
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code to set default SMP affinity. */
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err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count;
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} else {
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irq_set_affinity(irq, new_value);
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err = count;
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}
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free_cpumask:
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free_cpumask_var(new_value);
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return err;
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}
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static ssize_t irq_affinity_proc_write(struct file *file,
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const char __user *buffer, size_t count, loff_t *pos)
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{
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return write_irq_affinity(0, file, buffer, count, pos);
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}
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static ssize_t irq_affinity_list_proc_write(struct file *file,
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const char __user *buffer, size_t count, loff_t *pos)
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{
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return write_irq_affinity(1, file, buffer, count, pos);
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}
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static int irq_affinity_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
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}
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static int irq_affinity_list_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
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}
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static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
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}
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static const struct file_operations irq_affinity_proc_fops = {
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.open = irq_affinity_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.write = irq_affinity_proc_write,
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};
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static const struct file_operations irq_affinity_hint_proc_fops = {
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.open = irq_affinity_hint_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static const struct file_operations irq_affinity_list_proc_fops = {
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.open = irq_affinity_list_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.write = irq_affinity_list_proc_write,
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};
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static int default_affinity_show(struct seq_file *m, void *v)
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{
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seq_cpumask(m, irq_default_affinity);
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seq_putc(m, '\n');
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return 0;
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}
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static ssize_t default_affinity_write(struct file *file,
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const char __user *buffer, size_t count, loff_t *ppos)
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{
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cpumask_var_t new_value;
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int err;
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if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
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return -ENOMEM;
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err = cpumask_parse_user(buffer, count, new_value);
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if (err)
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goto out;
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if (!is_affinity_mask_valid(new_value)) {
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err = -EINVAL;
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goto out;
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}
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/*
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* Do not allow disabling IRQs completely - it's a too easy
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* way to make the system unusable accidentally :-) At least
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* one online CPU still has to be targeted.
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*/
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if (!cpumask_intersects(new_value, cpu_online_mask)) {
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err = -EINVAL;
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goto out;
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}
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cpumask_copy(irq_default_affinity, new_value);
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err = count;
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out:
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free_cpumask_var(new_value);
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return err;
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}
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static int default_affinity_open(struct inode *inode, struct file *file)
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{
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return single_open(file, default_affinity_show, PDE_DATA(inode));
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}
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static const struct file_operations default_affinity_proc_fops = {
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.open = default_affinity_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.write = default_affinity_write,
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};
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static int irq_node_proc_show(struct seq_file *m, void *v)
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{
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struct irq_desc *desc = irq_to_desc((long) m->private);
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seq_printf(m, "%d\n", desc->irq_data.node);
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return 0;
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}
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static int irq_node_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, irq_node_proc_show, PDE_DATA(inode));
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}
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static const struct file_operations irq_node_proc_fops = {
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.open = irq_node_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif
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static int irq_spurious_proc_show(struct seq_file *m, void *v)
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{
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struct irq_desc *desc = irq_to_desc((long) m->private);
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seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n",
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desc->irq_count, desc->irqs_unhandled,
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jiffies_to_msecs(desc->last_unhandled));
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return 0;
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}
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static int irq_spurious_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
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}
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static const struct file_operations irq_spurious_proc_fops = {
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.open = irq_spurious_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#define MAX_NAMELEN 128
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static int name_unique(unsigned int irq, struct irqaction *new_action)
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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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unsigned long flags;
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int ret = 1;
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raw_spin_lock_irqsave(&desc->lock, flags);
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for (action = desc->action ; action; action = action->next) {
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if ((action != new_action) && action->name &&
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!strcmp(new_action->name, action->name)) {
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ret = 0;
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break;
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}
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}
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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return ret;
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}
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void register_handler_proc(unsigned int irq, struct irqaction *action)
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{
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char name [MAX_NAMELEN];
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struct irq_desc *desc = irq_to_desc(irq);
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if (!desc->dir || action->dir || !action->name ||
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!name_unique(irq, action))
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return;
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memset(name, 0, MAX_NAMELEN);
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snprintf(name, MAX_NAMELEN, "%s", action->name);
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/* create /proc/irq/1234/handler/ */
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action->dir = proc_mkdir(name, desc->dir);
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}
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#undef MAX_NAMELEN
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#define MAX_NAMELEN 10
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void register_irq_proc(unsigned int irq, struct irq_desc *desc)
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{
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char name [MAX_NAMELEN];
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if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip) || desc->dir)
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return;
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memset(name, 0, MAX_NAMELEN);
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sprintf(name, "%d", irq);
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/* create /proc/irq/1234 */
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desc->dir = proc_mkdir(name, root_irq_dir);
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if (!desc->dir)
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return;
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#ifdef CONFIG_SMP
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/* create /proc/irq/<irq>/smp_affinity */
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proc_create_data("smp_affinity", 0600, desc->dir,
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&irq_affinity_proc_fops, (void *)(long)irq);
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/* create /proc/irq/<irq>/affinity_hint */
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proc_create_data("affinity_hint", 0400, desc->dir,
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&irq_affinity_hint_proc_fops, (void *)(long)irq);
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/* create /proc/irq/<irq>/smp_affinity_list */
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proc_create_data("smp_affinity_list", 0600, desc->dir,
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&irq_affinity_list_proc_fops, (void *)(long)irq);
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proc_create_data("node", 0444, desc->dir,
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&irq_node_proc_fops, (void *)(long)irq);
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#endif
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proc_create_data("spurious", 0444, desc->dir,
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&irq_spurious_proc_fops, (void *)(long)irq);
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}
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void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
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{
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char name [MAX_NAMELEN];
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if (!root_irq_dir || !desc->dir)
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return;
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#ifdef CONFIG_SMP
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remove_proc_entry("smp_affinity", desc->dir);
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remove_proc_entry("affinity_hint", desc->dir);
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remove_proc_entry("smp_affinity_list", desc->dir);
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remove_proc_entry("node", desc->dir);
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#endif
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remove_proc_entry("spurious", desc->dir);
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memset(name, 0, MAX_NAMELEN);
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sprintf(name, "%u", irq);
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remove_proc_entry(name, root_irq_dir);
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}
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#undef MAX_NAMELEN
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void unregister_handler_proc(unsigned int irq, struct irqaction *action)
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{
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proc_remove(action->dir);
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}
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static void register_default_affinity_proc(void)
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{
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#ifdef CONFIG_SMP
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proc_create("irq/default_smp_affinity", 0600, NULL,
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&default_affinity_proc_fops);
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#endif
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}
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void init_irq_proc(void)
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{
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unsigned int irq;
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struct irq_desc *desc;
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/* create /proc/irq */
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root_irq_dir = proc_mkdir("irq", NULL);
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if (!root_irq_dir)
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return;
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register_default_affinity_proc();
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/*
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* Create entries for all existing IRQs.
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*/
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for_each_irq_desc(irq, desc) {
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if (!desc)
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continue;
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register_irq_proc(irq, desc);
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}
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}
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#ifdef CONFIG_GENERIC_IRQ_SHOW
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int __weak arch_show_interrupts(struct seq_file *p, int prec)
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{
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return 0;
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}
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#ifndef ACTUAL_NR_IRQS
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# define ACTUAL_NR_IRQS nr_irqs
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#endif
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int show_interrupts(struct seq_file *p, void *v)
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{
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static int prec;
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unsigned long flags, any_count = 0;
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int i = *(loff_t *) v, j;
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struct irqaction *action;
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struct irq_desc *desc;
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if (i > ACTUAL_NR_IRQS)
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return 0;
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if (i == ACTUAL_NR_IRQS)
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return arch_show_interrupts(p, prec);
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/* print header and calculate the width of the first column */
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if (i == 0) {
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for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
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j *= 10;
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seq_printf(p, "%*s", prec + 8, "");
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for_each_online_cpu(j)
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seq_printf(p, "CPU%-8d", j);
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seq_putc(p, '\n');
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}
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desc = irq_to_desc(i);
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if (!desc)
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return 0;
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raw_spin_lock_irqsave(&desc->lock, flags);
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for_each_online_cpu(j)
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any_count |= kstat_irqs_cpu(i, j);
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action = desc->action;
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if (!action && !any_count)
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goto out;
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seq_printf(p, "%*d: ", prec, i);
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
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if (desc->irq_data.chip) {
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if (desc->irq_data.chip->irq_print_chip)
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desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);
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else if (desc->irq_data.chip->name)
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seq_printf(p, " %8s", desc->irq_data.chip->name);
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else
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seq_printf(p, " %8s", "-");
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} else {
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seq_printf(p, " %8s", "None");
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}
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if (desc->irq_data.domain)
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seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);
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#ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL
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seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
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#endif
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if (desc->name)
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seq_printf(p, "-%-8s", desc->name);
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if (action) {
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seq_printf(p, " %s", action->name);
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while ((action = action->next) != NULL)
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seq_printf(p, ", %s", action->name);
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}
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seq_putc(p, '\n');
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out:
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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return 0;
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}
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#endif
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