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genirq: Expose irq_desc->node in proc/irq

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Expose irq_desc->node as /proc/irq/*/node.

This file provides device hardware locality information for apps
desiring to include hardware locality in irq mapping decisions.

Signed-off-by: Dimitri Sivanich <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Dimitri Sivanich 2010-03-11 14:08:56 -08:00 • committed by Thomas Gleixner
commit 92d6b71ab9
2 changed files with 27 additions and 0 deletions
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23
kernel/irq/proc.c
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@ -146,6 +146,26 @@ static const struct file_operations default_affinity_proc_fops = {
.release = single_release,
.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", desc->node);
return 0;
}
static int irq_node_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, irq_node_proc_show, PDE(inode)->data);
}
static const struct file_operations irq_node_proc_fops = {
.open = irq_node_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#endif
static int irq_spurious_proc_show(struct seq_file *m, void *v)
@ -230,6 +250,9 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
/* create /proc/irq/<irq>/smp_affinity */
proc_create_data("smp_affinity", 0600, desc->dir,
&irq_affinity_proc_fops, (void *)(long)irq);
proc_create_data("node", 0444, desc->dir,
&irq_node_proc_fops, (void *)(long)irq);
#endif
proc_create_data("spurious", 0444, desc->dir,