Re: [PATCH] More PCI fixes for 2.6.10-rc2

[Greg KH]

ChangeSet 1.2223.2.3, 2004/11/29 11:12:54-08:00, ak@xxxxxxx

[PATCH] PCI: Add sysfs file to map PCI busses to cpus

Add sysfs file to map PCI busses to cpus

Export the information from pcibus_to_cpumask() to sysfs. This
is useful for some user space programs who want to optimize their IO
using O_DIRECT.

There was some indecision on whether it's more useful to report
cpus or nodes here. In the end cpus was chosen because that is
what the existing macros report.

Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <greg@xxxxxxxxx>


 drivers/pci/pci-sysfs.c |   11 +++++++++++
 1 files changed, 11 insertions(+)


diff -Nru a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
--- a/drivers/pci/pci-sysfs.c	2004-11-30 15:47:18 -08:00
+++ b/drivers/pci/pci-sysfs.c	2004-11-30 15:47:18 -08:00
@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/stat.h>
+#include <linux/topology.h>
 
 #include "pci.h"
 
@@ -42,6 +43,15 @@
 pci_config_attr(class, "0x%06x\n");
 pci_config_attr(irq, "%u\n");
 
+static ssize_t local_cpus_show(struct device *dev, char *buf)
+{		
+	struct pci_dev *pdev = to_pci_dev(dev);
+	cpumask_t mask = pcibus_to_cpumask(pdev->bus->number);
+	int len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
+	strcat(buf,"\n"); 
+	return 1+len;
+}
+
 /* show resources */
 static ssize_t
 resource_show(struct device * dev, char * buf)
@@ -71,6 +81,7 @@
 	__ATTR_RO(subsystem_device),
 	__ATTR_RO(class),
 	__ATTR_RO(irq),
+	__ATTR_RO(local_cpus),
 	__ATTR_NULL,
 };
 

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