From: Andi Kleen Date: Wed, 30 Jan 2008 12:32:48 +0000 (+0100) Subject: x86: add /proc/irq/*/spurious to dump the spurious irq debugging state X-Git-Tag: v2.6.25-rc1~1143^2~396 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96d97cf03b3d68e6c857623da93acd522b2b7e1a;p=linux-2.6 x86: add /proc/irq/*/spurious to dump the spurious irq debugging state This is useful to debug problems with interrupt handlers that return sometimes IRQ_NONE. Signed-off-by: Andi Kleen Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index 50b81b9804..c2f2ccb054 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -75,6 +75,18 @@ static int irq_affinity_write_proc(struct file *file, const char __user *buffer, #endif +static int irq_spurious_read(char *page, char **start, off_t off, + int count, int *eof, void *data) +{ + struct irq_desc *d = &irq_desc[(long) data]; + return sprintf(page, "count %u\n" + "unhandled %u\n" + "last_unhandled %u ms\n", + d->irq_count, + d->irqs_unhandled, + jiffies_to_msecs(d->last_unhandled)); +} + #define MAX_NAMELEN 128 static int name_unique(unsigned int irq, struct irqaction *new_action) @@ -118,6 +130,7 @@ void register_handler_proc(unsigned int irq, struct irqaction *action) void register_irq_proc(unsigned int irq) { char name [MAX_NAMELEN]; + struct proc_dir_entry *entry; if (!root_irq_dir || (irq_desc[irq].chip == &no_irq_chip) || @@ -132,8 +145,6 @@ void register_irq_proc(unsigned int irq) #ifdef CONFIG_SMP { - struct proc_dir_entry *entry; - /* create /proc/irq//smp_affinity */ entry = create_proc_entry("smp_affinity", 0600, irq_desc[irq].dir); @@ -144,6 +155,12 @@ void register_irq_proc(unsigned int irq) } } #endif + + entry = create_proc_entry("spurious", 0444, irq_desc[irq].dir); + if (entry) { + entry->data = (void *)(long)irq; + entry->read_proc = irq_spurious_read; + } } #undef MAX_NAMELEN