// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar * * This file contains the /proc/irq/ handling code. */ #include <linux/irq.h>#include <linux/gfp.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/interrupt.h>#include <linux/kernel_stat.h>#include <linux/mutex.h> #include "internals.h" /* * Access rules: * * procfs protects read/write of /proc/irq/N/ files against a * concurrent free of the interrupt descriptor. remove_proc_entry() * immediately prevents new read/writes to happen and waits for * already running read/write functions to complete. * * We remove the proc entries first and then delete the interrupt * descriptor from the radix tree and free it. So it is guaranteed * that irq_to_desc(N) is valid as long as the read/writes are * permitted by procfs. * * The read from /proc/interrupts is a different problem because there * is no protection. So the lookup and the access to irqdesc * information must be protected by sparse_irq_lock. */static struct proc_dir_entry *root_irq_dir; #ifdef CONFIG_SMP enum { AFFINITY, AFFINITY_LIST, EFFECTIVE, EFFECTIVE_LIST,}; static int show_irq_affinity(int type, struct seq_file *m){ struct irq_desc *desc = irq_to_desc((long)m->private); const struct cpumask *mask; switch (type) { case AFFINITY: case AFFINITY_LIST: mask = desc->irq_common_data.affinity; if (irq_move_pending(&desc->irq_data)) mask = irq_desc_get_pending_mask(desc); break; case EFFECTIVE: case EFFECTIVE_LIST:#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK mask = irq_data_get_effective_affinity_mask(&desc->irq_data); break;#endif default: return -EINVAL; } switch (type) { case AFFINITY_LIST: case EFFECTIVE_LIST: seq_printf(m, "%*pbl\n", cpumask_pr_args(mask)); break; case AFFINITY: case EFFECTIVE: seq_printf(m, "%*pb\n", cpumask_pr_args(mask)); break; } return 0;} static int irq_affinity_hint_proc_show(struct seq_file *m, void *v){ struct irq_desc *desc = irq_to_desc((long)m->private); unsigned long flags; cpumask_var_t mask; if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) return -ENOMEM; raw_spin_lock_irqsave(&desc->lock, flags); if (desc->affinity_hint) cpumask_copy(mask, desc->affinity_hint); raw_spin_unlock_irqrestore(&desc->lock, flags); seq_printf(m, "%*pb\n", cpumask_pr_args(mask)); free_cpumask_var(mask); return 0;} int no_irq_affinity;static int irq_affinity_proc_show(struct seq_file *m, void *v){ return show_irq_affinity(AFFINITY, m);} static int irq_affinity_list_proc_show(struct seq_file *m, void *v){ return show_irq_affinity(AFFINITY_LIST, m);} #ifndef CONFIG_AUTO_IRQ_AFFINITYstatic inline int irq_select_affinity_usr(unsigned int irq){ /* * If the interrupt is started up already then this fails. The * interrupt is assigned to an online CPU already. There is no * point to move it around randomly. Tell user space that the * selected mask is bogus. * * If not then any change to the affinity is pointless because the * startup code invokes irq_setup_affinity() which will select * a online CPU anyway. */ return -EINVAL;}#else/* ALPHA magic affinity auto selector. Keep it for historical reasons. */static inline int irq_select_affinity_usr(unsigned int irq){ return irq_select_affinity(irq);}#endif static ssize_t write_irq_affinity(int type, struct file *file, const char __user *buffer, size_t count, loff_t *pos){ unsigned int irq = (int)(long)pde_data(file_inode(file)); cpumask_var_t new_value; int err; if (!irq_can_set_affinity_usr(irq) || no_irq_affinity) return -EPERM; if (!zalloc_cpumask_var(&new_value, GFP_KERNEL)) return -ENOMEM; if (type) err = cpumask_parselist_user(buffer, count, new_value); else err = cpumask_parse_user(buffer, count, new_value); if (err) goto free_cpumask; /* * Do not allow disabling IRQs completely - it's a too easy * way to make the system unusable accidentally :-) At least * one online CPU still has to be targeted. */ if (!cpumask_intersects(new_value, cpu_online_mask)) { /* * Special case for empty set - allow the architecture code * to set default SMP affinity. */ err = irq_select_affinity_usr(irq) ? -EINVAL : count; } else { err = irq_set_affinity(irq, new_value); if (!err) err = count; } free_cpumask: free_cpumask_var(new_value); return err;} static ssize_t irq_affinity_proc_write(struct file *file, const char __user *buffer, size_t count, loff_t *pos){ return write_irq_affinity(0, file, buffer, count, pos);} static ssize_t irq_affinity_list_proc_write(struct file *file, const char __user *buffer, size_t count, loff_t *pos){ return write_irq_affinity(1, file, buffer, count, pos);} static int irq_affinity_proc_open(struct inode *inode, struct file *file){ return single_open(file, irq_affinity_proc_show, pde_data(inode));} static int irq_affinity_list_proc_open(struct inode *inode, struct file *file){ return single_open(file, irq_affinity_list_proc_show, pde_data(inode));} static const struct proc_ops irq_affinity_proc_ops = { .proc_open = irq_affinity_proc_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = single_release, .proc_write = irq_affinity_proc_write,}; static const struct proc_ops irq_affinity_list_proc_ops = { .proc_open = irq_affinity_list_proc_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = single_release, .proc_write = irq_affinity_list_proc_write,}; #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASKstatic int irq_effective_aff_proc_show(struct seq_file *m, void *v){ return show_irq_affinity(EFFECTIVE, m);} static int irq_effective_aff_list_proc_show(struct seq_file *m, void *v){ return show_irq_affinity(EFFECTIVE_LIST, m);}#endif static int default_affinity_show(struct seq_file *m, void *v){ seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity)); return 0;} static ssize_t default_affinity_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos){ cpumask_var_t new_value; int err; if (!zalloc_cpumask_var(&new_value, GFP_KERNEL)) return -ENOMEM; err = cpumask_parse_user(buffer, count, new_value); if (err) goto out; /* * Do not allow disabling IRQs completely - it's a too easy * way to make the system unusable accidentally :-) At least * one online CPU still has to be targeted. */ if (!cpumask_intersects(new_value, cpu_online_mask)) { err = -EINVAL; goto out; } cpumask_copy(irq_default_affinity, new_value); err = count; out: free_cpumask_var(new_value); return err;} static int default_affinity_open(struct inode *inode, struct file *file){ return single_open(file, default_affinity_show, pde_data(inode));} static const struct proc_ops default_affinity_proc_ops = { .proc_open = default_affinity_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = single_release, .proc_write = default_affinity_write,}; static int irq_node_proc_show(struct seq_file *m, void *v){ struct irq_desc *desc = irq_to_desc((long) m->private); seq_printf(m, "%d\n", irq_desc_get_node(desc)); return 0;}#endif static int irq_spurious_proc_show(struct seq_file *m, void *v){ struct irq_desc *desc = irq_to_desc((long) m->private); seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n", desc->irq_count, desc->irqs_unhandled, jiffies_to_msecs(desc->last_unhandled)); return 0;} #define MAX_NAMELEN 128 static int name_unique(unsigned int irq, struct irqaction *new_action){ struct irq_desc *desc = irq_to_desc(irq); struct irqaction *action; unsigned long flags; int ret = 1; raw_spin_lock_irqsave(&desc->lock, flags); for_each_action_of_desc(desc, action) { if ((action != new_action) && action->name && !strcmp(new_action->name, action->name)) { ret = 0; break; } } raw_spin_unlock_irqrestore(&desc->lock, flags); return ret;} void register_handler_proc(unsigned int irq, struct irqaction *action){ char name [MAX_NAMELEN]; struct irq_desc *desc = irq_to_desc(irq); if (!desc->dir || action->dir || !action->name || !name_unique(irq, action)) return; snprintf(name, MAX_NAMELEN, "%s", action->name); /* create /proc/irq/1234/handler/ */ action->dir = proc_mkdir(name, desc->dir);} #undef MAX_NAMELEN #define MAX_NAMELEN 10 void register_irq_proc(unsigned int irq, struct irq_desc *desc){ static DEFINE_MUTEX(register_lock); void __maybe_unused *irqp = (void *)(unsigned long) irq; char name [MAX_NAMELEN]; if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip)) return; /* * irq directories are registered only when a handler is * added, not when the descriptor is created, so multiple * tasks might try to register at the same time. */ mutex_lock(®ister_lock); if (desc->dir) goto out_unlock; sprintf(name, "%d", irq); /* create /proc/irq/1234 */ desc->dir = proc_mkdir(name, root_irq_dir); if (!desc->dir) goto out_unlock; #ifdef CONFIG_SMP umode_t umode = S_IRUGO; if (irq_can_set_affinity_usr(desc->irq_data.irq)) umode |= S_IWUSR; /* create /proc/irq/<irq>/smp_affinity */ proc_create_data("smp_affinity", umode, desc->dir, &irq_affinity_proc_ops, irqp); /* create /proc/irq/<irq>/affinity_hint */ proc_create_single_data("affinity_hint", 0444, desc->dir, irq_affinity_hint_proc_show, irqp); /* create /proc/irq/<irq>/smp_affinity_list */ proc_create_data("smp_affinity_list", umode, desc->dir, &irq_affinity_list_proc_ops, irqp); proc_create_single_data("node", 0444, desc->dir, irq_node_proc_show, irqp);# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK proc_create_single_data("effective_affinity", 0444, desc->dir, irq_effective_aff_proc_show, irqp); proc_create_single_data("effective_affinity_list", 0444, desc->dir, irq_effective_aff_list_proc_show, irqp);# endif#endif proc_create_single_data("spurious", 0444, desc->dir, irq_spurious_proc_show, (void *)(long)irq); out_unlock: mutex_unlock(®ister_lock);} void unregister_irq_proc(unsigned int irq, struct irq_desc *desc){ char name [MAX_NAMELEN]; if (!root_irq_dir || !desc->dir) return;#ifdef CONFIG_SMP remove_proc_entry("smp_affinity", desc->dir); remove_proc_entry("affinity_hint", desc->dir); remove_proc_entry("smp_affinity_list", desc->dir); remove_proc_entry("node", desc->dir);# ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK remove_proc_entry("effective_affinity", desc->dir); remove_proc_entry("effective_affinity_list", desc->dir);# endif#endif remove_proc_entry("spurious", desc->dir); sprintf(name, "%u", irq); remove_proc_entry(name, root_irq_dir);} #undef MAX_NAMELEN void unregister_handler_proc(unsigned int irq, struct irqaction *action){ proc_remove(action->dir);} static void register_default_affinity_proc(void){#ifdef CONFIG_SMP proc_create("irq/default_smp_affinity", 0644, NULL, &default_affinity_proc_ops);#endif} void init_irq_proc(void){ unsigned int irq; struct irq_desc *desc; /* create /proc/irq */ root_irq_dir = proc_mkdir("irq", NULL); if (!root_irq_dir) return; register_default_affinity_proc(); /* * Create entries for all existing IRQs. */ for_each_irq_desc(irq, desc) register_irq_proc(irq, desc);} #ifdef CONFIG_GENERIC_IRQ_SHOW int __weak arch_show_interrupts(struct seq_file *p, int prec){ return 0;} #ifndef ACTUAL_NR_IRQS# define ACTUAL_NR_IRQS irq_get_nr_irqs()#endif int show_interrupts(struct seq_file *p, void *v){ const unsigned int nr_irqs = irq_get_nr_irqs(); static int prec; int i = *(loff_t *) v, j; struct irqaction *action; struct irq_desc *desc; unsigned long flags; if (i > ACTUAL_NR_IRQS) return 0; if (i == ACTUAL_NR_IRQS) return arch_show_interrupts(p, prec); /* print header and calculate the width of the first column */ if (i == 0) { for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) j *= 10; seq_printf(p, "%*s", prec + 8, ""); for_each_online_cpu(j) seq_printf(p, "CPU%-8d", j); seq_putc(p, '\n'); } rcu_read_lock(); desc = irq_to_desc(i); if (!desc || irq_settings_is_hidden(desc)) goto outsparse; if (!desc->action || irq_desc_is_chained(desc) || !desc->kstat_irqs) goto outsparse; seq_printf(p, "%*d:", prec, i); for_each_online_cpu(j) { unsigned int cnt = desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, j) : 0;Lines 1–500 of 540. 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// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar * * This file contains the /proc/irq/ handling code. */ #include <linux/irq.h> #include <linux/gfp.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/interrupt.h> #include <linux/kernel_stat.h> #include <linux/mutex.h> #include "internals.h" /* * Access rules: * * procfs protects read/write of /proc/irq/N/ files against a * concurrent free of the interrupt descriptor. remove_proc_entry() * immediately prevents new read/writes to happen and waits for * already running read/write functions to complete. * * We remove the proc entries first and then delete the interrupt * descriptor from the radix tree and free it. So it is guaranteed * that irq_to_desc(N) is valid as long as the read/writes are * permitted by procfs. * * The read from /proc/interrupts is a different problem because there * is no protection. So the lookup and the access to irqdesc * information must be protected by sparse_irq_lock. */ static struct proc_dir_entry *root_irq_dir; #ifdef CONFIG_SMP enum { AFFINITY, AFFINITY_LIST, EFFECTIVE, EFFECTIVE_LIST, }; static int show_irq_affinity(int type, struct seq_file *m) { struct irq_desc *desc = irq_to_desc((long)m->private); const struct cpumask *mask; switch (type) { case AFFINITY: case AFFINITY_LIST: mask = desc->irq_common_data.affinity; if (irq_move_pending(&desc->irq_data)) mask = irq_desc_get_pending_mask(desc); break; case EFFECTIVE: case EFFECTIVE_LIST: #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK mask = irq_data_get_effective_affinity_mask(&desc->irq_data); break; #endif default: return -EINVAL; } switch (type) { case AFFINITY_LIST: case EFFECTIVE_LIST: seq_printf(m, "%*pbl\n", cpumask_pr_args(mask)); break; case AFFINITY: case EFFECTIVE: seq_printf(m, "%*pb\n", cpumask_pr_args(mask)); break; } return 0; } static int irq_affinity_hint_proc_show(struct seq_file *m, void *v) { struct irq_desc *desc = irq_to_desc((long)m->private); unsigned long flags; cpumask_var_t mask; if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) return -ENOMEM; raw_spin_lock_irqsave(&desc->lock, flags); if (desc->affinity_hint) cpumask_copy(mask, desc->affinity_hint); raw_spin_unlock_irqrestore(&desc->lock, flags); seq_printf(m, "%*pb\n", cpumask_pr_args(mask)); free_cpumask_var(mask); return 0; } int no_irq_affinity; static int irq_affinity_proc_show(struct seq_file *m, void *v) { return show_irq_affinity(AFFINITY, m); } static int irq_affinity_list_proc_show(struct seq_file *m, void *v) { return show_irq_affinity(AFFINITY_LIST, m); } #ifndef CONFIG_AUTO_IRQ_AFFINITY static inline int irq_select_affinity_usr(unsigned int irq) { /* * If the interrupt is started up already then this fails. The * interrupt is assigned to an online CPU already. There is no * point to move it around randomly. Tell user space that the * selected mask is bogus. * * If not then any change to the affinity is pointless because the * startup code invokes irq_setup_affinity() which will select * a online CPU anyway. */ return -EINVAL; } #else /* ALPHA magic affinity auto selector. Keep it for historical reasons. */ static inline int irq_select_affinity_usr(unsigned int irq) { return irq_select_affinity(irq); } #endif static ssize_t write_irq_affinity(int type, struct file *file, const char __user *buffer, size_t count, loff_t *pos) { unsigned int irq = (int)(long)pde_data(file_inode(file)); cpumask_var_t new_value; int err; if (!irq_can_set_affinity_usr(irq) || no_irq_affinity) return -EPERM; if (!zalloc_cpumask_var(&new_value, GFP_KERNEL)) return -ENOMEM; if (type) err = cpumask_parselist_user(buffer, count, new_value); else err = cpumask_parse_user(buffer, count, new_value); if (err) goto free_cpumask; /* * Do not allow disabling IRQs completely - it's a too easy * way to make the system unusable accidentally :-) At least * one online CPU still has to be targeted. */ if (!cpumask_intersects(new_value, cpu_online_mask)) { /* * Special case for empty set - allow the architecture code * to set default SMP affinity. */ err = irq_select_affinity_usr(irq) ? -EINVAL : count; } else { err = irq_set_affinity(irq, new_value); if (!err) err = count; } free_cpumask: free_cpumask_var(new_value); return err; } static ssize_t irq_affinity_proc_write(struct file *file, const char __user *buffer, size_t count, loff_t *pos) { return write_irq_affinity(0, file, buffer, count, pos); } static ssize_t irq_affinity_list_proc_write(struct file *file, const char __user *buffer, size_t count, loff_t *pos) { return write_irq_affinity(1, file, buffer, count, pos); } static int irq_affinity_proc_open(struct inode *inode, struct file *file) { return single_open(file, irq_affinity_proc_show, pde_data(inode)); } static int irq_affinity_list_proc_open(struct inode *inode, struct file *file) { return single_open(file, irq_affinity_list_proc_show, pde_data(inode)); } static const struct proc_ops irq_affinity_proc_ops = { .proc_open = irq_affinity_proc_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = single_release, .proc_write = irq_affinity_proc_write, }; static const struct proc_ops irq_affinity_list_proc_ops = { .proc_open = irq_affinity_list_proc_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = single_release, .proc_write = irq_affinity_list_proc_write, }; #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK static int irq_effective_aff_proc_show(struct seq_file *m, void *v) { return show_irq_affinity(EFFECTIVE, m); } static int irq_effective_aff_list_proc_show(struct seq_file *m, void *v) { return show_irq_affinity(EFFECTIVE_LIST, m); } #endif static int default_affinity_show(struct seq_file *m, void *v) { seq_printf(m, "%*pb\n", cpumask_pr_args(irq_default_affinity)); return 0; } static ssize_t default_affinity_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { cpumask_var_t new_value; int err; if (!zalloc_cpumask_var(&new_value, GFP_KERNEL)) return -ENOMEM; err = cpumask_parse_user(buffer, count, new_value); if (err) goto out; /* * Do not allow disabling IRQs completely - it's a too easy * way to make the system unusable accidentally :-) At least * one online CPU still has to be targeted. */ if (!cpumask_intersects(new_value, cpu_online_mask)) { err = -EINVAL; goto out; } cpumask_copy(irq_default_affinity, new_value); err = count; out: free_cpumask_var(new_value); return err; } static int default_affinity_open(struct inode *inode, struct file *file) { return single_open(file, default_affinity_show, pde_data(inode)); } static const struct proc_ops default_affinity_proc_ops = { .proc_open = default_affinity_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = single_release, .proc_write = default_affinity_write, }; static int irq_node_proc_show(struct seq_file *m, void *v) { struct irq_desc *desc = irq_to_desc((long) m->private); seq_printf(m, "%d\n", irq_desc_get_node(desc)); return 0; } #endif static int irq_spurious_proc_show(struct seq_file *m, void *v) { struct irq_desc *desc = irq_to_desc((long) m->private); seq_printf(m, "count %u\n" "unhandled %u\n" "last_unhandled %u ms\n", desc->irq_count, desc->irqs_unhandled, jiffies_to_msecs(desc->last_unhandled)); return 0; } #define MAX_NAMELEN 128 static int name_unique(unsigned int irq, struct irqaction *new_action) { struct irq_desc *desc = irq_to_desc(irq); struct irqaction *action; unsigned long flags; int ret = 1; raw_spin_lock_irqsave(&desc->lock, flags); for_each_action_of_desc(desc, action) { if ((action != new_action) && action->name && !strcmp(new_action->name, action->name)) { ret = 0; break; } } raw_spin_unlock_irqrestore(&desc->lock, flags); return ret; } void register_handler_proc(unsigned int irq, struct irqaction *action) { char name [MAX_NAMELEN]; struct irq_desc *desc = irq_to_desc(irq); if (!desc->dir || action->dir || !action->name || !name_unique(irq, action)) return; snprintf(name, MAX_NAMELEN, "%s", action->name); /* create /proc/irq/1234/handler/ */ action->dir = proc_mkdir(name, desc->dir); } #undef MAX_NAMELEN #define MAX_NAMELEN 10 void register_irq_proc(unsigned int irq, struct irq_desc *desc) { static DEFINE_MUTEX(register_lock); void __maybe_unused *irqp = (void *)(unsigned long) irq; char name [MAX_NAMELEN]; if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip)) return; /* * irq directories are registered only when a handler is * added, not when the descriptor is created, so multiple * tasks might try to register at the same time. */ mutex_lock(®ister_lock); if (desc->dir) goto out_unlock; sprintf(name, "%d", irq); /* create /proc/irq/1234 */ desc->dir = proc_mkdir(name, root_irq_dir); if (!desc->dir) goto out_unlock; #ifdef CONFIG_SMP umode_t umode = S_IRUGO; if (irq_can_set_affinity_usr(desc->irq_data.irq)) umode |= S_IWUSR; /* create /proc/irq/<irq>/smp_affinity */ proc_create_data("smp_affinity", umode, desc->dir, &irq_affinity_proc_ops, irqp); /* create /proc/irq/<irq>/affinity_hint */ proc_create_single_data("affinity_hint", 0444, desc->dir, irq_affinity_hint_proc_show, irqp); /* create /proc/irq/<irq>/smp_affinity_list */ proc_create_data("smp_affinity_list", umode, desc->dir, &irq_affinity_list_proc_ops, irqp); proc_create_single_data("node", 0444, desc->dir, irq_node_proc_show, irqp); # ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK proc_create_single_data("effective_affinity", 0444, desc->dir, irq_effective_aff_proc_show, irqp); proc_create_single_data("effective_affinity_list", 0444, desc->dir, irq_effective_aff_list_proc_show, irqp); # endif #endif proc_create_single_data("spurious", 0444, desc->dir, irq_spurious_proc_show, (void *)(long)irq); out_unlock: mutex_unlock(®ister_lock); } void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { char name [MAX_NAMELEN]; if (!root_irq_dir || !desc->dir) return; #ifdef CONFIG_SMP remove_proc_entry("smp_affinity", desc->dir); remove_proc_entry("affinity_hint", desc->dir); remove_proc_entry("smp_affinity_list", desc->dir); remove_proc_entry("node", desc->dir); # ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK remove_proc_entry("effective_affinity", desc->dir); remove_proc_entry("effective_affinity_list", desc->dir); # endif #endif remove_proc_entry("spurious", desc->dir); sprintf(name, "%u", irq); remove_proc_entry(name, root_irq_dir); } #undef MAX_NAMELEN void unregister_handler_proc(unsigned int irq, struct irqaction *action) { proc_remove(action->dir); } static void register_default_affinity_proc(void) { #ifdef CONFIG_SMP proc_create("irq/default_smp_affinity", 0644, NULL, &default_affinity_proc_ops); #endif } void init_irq_proc(void) { unsigned int irq; struct irq_desc *desc; /* create /proc/irq */ root_irq_dir = proc_mkdir("irq", NULL); if (!root_irq_dir) return; register_default_affinity_proc(); /* * Create entries for all existing IRQs. */ for_each_irq_desc(irq, desc) register_irq_proc(irq, desc); } #ifdef CONFIG_GENERIC_IRQ_SHOW int __weak arch_show_interrupts(struct seq_file *p, int prec) { return 0; } #ifndef ACTUAL_NR_IRQS # define ACTUAL_NR_IRQS irq_get_nr_irqs() #endif int show_interrupts(struct seq_file *p, void *v) { const unsigned int nr_irqs = irq_get_nr_irqs(); static int prec; int i = *(loff_t *) v, j; struct irqaction *action; struct irq_desc *desc; unsigned long flags; if (i > ACTUAL_NR_IRQS) return 0; if (i == ACTUAL_NR_IRQS) return arch_show_interrupts(p, prec); /* print header and calculate the width of the first column */ if (i == 0) { for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) j *= 10; seq_printf(p, "%*s", prec + 8, ""); for_each_online_cpu(j) seq_printf(p, "CPU%-8d", j); seq_putc(p, '\n'); } rcu_read_lock(); desc = irq_to_desc(i); if (!desc || irq_settings_is_hidden(desc)) goto outsparse; if (!desc->action || irq_desc_is_chained(desc) || !desc->kstat_irqs) goto outsparse; seq_printf(p, "%*d:", prec, i); for_each_online_cpu(j) { unsigned int cnt = desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, j) : 0;