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Commit 92d6b71a authored by Dimitri Sivanich's avatar Dimitri Sivanich Committed by Thomas Gleixner
Browse files

genirq: Expose irq_desc->node in proc/irq 



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: default avatarDimitri Sivanich <sivanich@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 220bf991

Documentation/filesystems/proc.txt

+4 −0
Original line number Diff line number Diff line
@@ -566,6 +566,10 @@ The default_smp_affinity mask applies to all non-active IRQs, which are the 
IRQs which have not yet been allocated/activated, and hence which lack a

/proc/irq/[0-9]* directory.



The node file on an SMP system shows the node to which the device using the IRQ

reports itself as being attached. This hardware locality information does not

include information about any possible driver locality preference.



prof_cpu_mask specifies which CPUs are to be profiled by the system wide

profiler. Default value is ffffffff (all cpus).

kernel/irq/proc.c

+23 −0
Original line number Diff line number Diff line
@@ -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,