diff options
| author | Michael Ellerman <michael@ellerman.id.au> | 2007-08-28 18:47:57 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-09-14 01:33:20 +1000 |
| commit | 60b332e755da7dbf32f1660973ce4f97ebf05d05 (patch) | |
| tree | 0f13a0e4c80b668c386cbb5a3766cb607e8166f8 /arch | |
| parent | 7866291d4cabf5491d4ecb62787308f8b8958f59 (diff) | |
[POWERPC] Export virq mapping via debugfs
This adds a debugfs file "powerpc/virq_mapping", which shows the virtual
to real mapping of irq numbers. Enable it with CONFIG_VIRQ_DEBUG.
Signed-off-by: Zhang Wei <wei.zhang@freescale.com>
Signed-off-by: Chen Gong <G.Chen@freescale.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/Kconfig.debug | 10 | ||||
| -rw-r--r-- | arch/powerpc/kernel/irq.c | 63 |
2 files changed, 73 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug index 22acece95b1..c38bc223705 100644 --- a/arch/powerpc/Kconfig.debug +++ b/arch/powerpc/Kconfig.debug @@ -124,6 +124,16 @@ config IRQSTACKS for handling hard and soft interrupts. This can help avoid overflowing the process kernel stacks. +config VIRQ_DEBUG + bool "Expose hardware/virtual IRQ mapping via debugfs" + depends on DEBUG_FS && PPC_MERGE + help + This option will show the mapping relationship between hardware irq + numbers and virtual irq numbers. The mapping is exposed via debugfs + in the file powerpc/virq_mapping. + + If you don't know what this means you don't need it. + config BDI_SWITCH bool "Include BDI-2000 user context switcher" depends on DEBUG_KERNEL && PPC32 diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 1339f32b44b..0e47c8cfc97 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -52,6 +52,7 @@ #include <linux/mutex.h> #include <linux/bootmem.h> #include <linux/pci.h> +#include <linux/debugfs.h> #include <asm/uaccess.h> #include <asm/system.h> @@ -1006,6 +1007,68 @@ static int irq_late_init(void) } arch_initcall(irq_late_init); +#ifdef CONFIG_VIRQ_DEBUG +static int virq_debug_show(struct seq_file *m, void *private) +{ + unsigned long flags; + irq_desc_t *desc; + const char *p; + char none[] = "none"; + int i; + + seq_printf(m, "%-5s %-7s %-15s %s\n", "virq", "hwirq", + "chip name", "host name"); + + for (i = 1; i < NR_IRQS; i++) { + desc = get_irq_desc(i); + spin_lock_irqsave(&desc->lock, flags); + + if (desc->action && desc->action->handler) { + seq_printf(m, "%5d ", i); + seq_printf(m, "0x%05lx ", virq_to_hw(i)); + + if (desc->chip && desc->chip->typename) + p = desc->chip->typename; + else + p = none; + seq_printf(m, "%-15s ", p); + + if (irq_map[i].host && irq_map[i].host->of_node) + p = irq_map[i].host->of_node->full_name; + else + p = none; + seq_printf(m, "%s\n", p); + } + + spin_unlock_irqrestore(&desc->lock, flags); + } + + return 0; +} + +static int virq_debug_open(struct inode *inode, struct file *file) +{ + return single_open(file, virq_debug_show, inode->i_private); +} + +static const struct file_operations virq_debug_fops = { + .open = virq_debug_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init irq_debugfs_init(void) +{ + if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root, + NULL, &virq_debug_fops)) + return -ENOMEM; + + return 0; +} +__initcall(irq_debugfs_init); +#endif /* CONFIG_VIRQ_DEBUG */ + #endif /* CONFIG_PPC_MERGE */ #ifdef CONFIG_PPC64 |