diff options
| author | Andi Kleen <ak@suse.de> | 2008-01-30 13:32:48 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:32:48 +0100 |
| commit | 96d97cf03b3d68e6c857623da93acd522b2b7e1a (patch) | |
| tree | f31885e66849ca2e20d9dffd72ecd556204dbb45 /kernel | |
| parent | genirq: turn irq debugging options into module params (diff) | |
| download | linux-96d97cf03b3d68e6c857623da93acd522b2b7e1a.tar.xz linux-96d97cf03b3d68e6c857623da93acd522b2b7e1a.zip | |
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 <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/proc.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index 50b81b98046a..c2f2ccb0549a 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/<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 |