70 lines
2.3 KiB
Diff
70 lines
2.3 KiB
Diff
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From: Dimitri Sivanich <sivanich@sgi.com>
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Subject: Expose the irq_desc node as /proc/irq/*/node.
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References: bnc#566745, fate#306952
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Patch-mainline: not yet
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This file provides device hardware locality information for apps desiring
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to include hardware locality in irq mapping decisions.
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Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Rafael J. Wysocki <rjw@suse.de>
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---
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Documentation/filesystems/proc.txt | 4 ++++
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kernel/irq/proc.c | 23 +++++++++++++++++++++++
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2 files changed, 27 insertions(+)
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--- a/Documentation/filesystems/proc.txt
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+++ b/Documentation/filesystems/proc.txt
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@@ -566,6 +566,10 @@ The default_smp_affinity mask applies to
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IRQs which have not yet been allocated/activated, and hence which lack a
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/proc/irq/[0-9]* directory.
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+The node file on an SMP system shows the node to which the device using the IRQ
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+reports itself as being attached. This hardware locality information does not
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+include information about any possible driver locality preference.
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+
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prof_cpu_mask specifies which CPUs are to be profiled by the system wide
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profiler. Default value is ffffffff (all cpus).
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--- a/kernel/irq/proc.c
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+++ b/kernel/irq/proc.c
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@@ -146,6 +146,26 @@ static const struct file_operations defa
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.release = single_release,
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.write = default_affinity_write,
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};
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+
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+static int irq_node_proc_show(struct seq_file *m, void *v)
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+{
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+ struct irq_desc *desc = irq_to_desc((long) m->private);
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+
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+ seq_printf(m, "%d\n", desc->node);
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+ return 0;
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+}
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+
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+static int irq_node_proc_open(struct inode *inode, struct file *file)
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+{
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+ return single_open(file, irq_node_proc_show, PDE(inode)->data);
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+}
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+
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+static const struct file_operations irq_node_proc_fops = {
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+ .open = irq_node_proc_open,
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+ .read = seq_read,
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+ .llseek = seq_lseek,
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+ .release = single_release,
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+};
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#endif
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static int irq_spurious_proc_show(struct seq_file *m, void *v)
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@@ -230,6 +250,9 @@ void register_irq_proc(unsigned int irq,
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/* create /proc/irq/<irq>/smp_affinity */
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proc_create_data("smp_affinity", 0600, desc->dir,
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&irq_affinity_proc_fops, (void *)(long)irq);
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+
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+ proc_create_data("node", 0444, desc->dir,
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+ &irq_node_proc_fops, (void *)(long)irq);
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#endif
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proc_create_data("spurious", 0444, desc->dir,
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