[PATCH] add numa node information to struct device

For node-aware skb allocations we need information about the node in struct
net_device or struct device.  Davem suggested to put it into struct device
which this patch does.

In particular:

 - struct device gets a new int numa_node member if CONFIG_NUMA is set
 - there are two new helpers, dev_to_node and set_dev_node to
   transparently deal with the non-numa case
 - for pci devices the node-info is set to the value we get from
   pcibus_to_node.

Note that for some architectures pcibus_to_node doesn't work yet at the time
we call it currently.  This is harmless and will just mean skb allocations
aren't node-local on this architectures until the implementation of
pcibus_to_node on these architectures have been updated (There are patches for
x86 and x86_64 floating around)

[akpm@osdl.org: cleanup]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 24 insertions, 0 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index e4b530ef757d..67b79a7592a9 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -386,6 +386,7 @@ void device_initialize(struct device *dev)
         INIT_LIST_HEAD(&dev->node);
         init_MUTEX(&dev->sem);
         device_init_wakeup(dev, 0);
+        set_dev_node(dev, -1);
 }
 
 #ifdef CONFIG_SYSFS_DEPRECATED
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 0eeac60042b3..6a3c1e728900 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -873,6 +873,7 @@ void __devinit pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
         dev->dev.release = pci_release_dev;
         pci_dev_get(dev);
 
+        set_dev_node(&dev->dev, pcibus_to_node(bus));
         dev->dev.dma_mask = &dev->dma_mask;
         dev->dev.coherent_dma_mask = 0xffffffffull;
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 583a341e016c..49ab53ce92dc 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -371,6 +371,9 @@ struct device {
                                            core doesn't touch it */
         struct dev_pm_info      power;
 
+#ifdef CONFIG_NUMA
+        int             numa_node;      /* NUMA node this device is close to */
+#endif
         u64             *dma_mask;      /* dma mask (if dma'able device) */
         u64             coherent_dma_mask;/* Like dma_mask, but for
                                              alloc_coherent mappings as
@@ -394,6 +397,25 @@ struct device {
         void    (*release)(struct device * dev);
 };
 
+#ifdef CONFIG_NUMA
+static inline int dev_to_node(struct device *dev)
+{
+        return dev->numa_node;
+}
+static inline void set_dev_node(struct device *dev, int node)
+{
+        dev->numa_node = node;
+}
+#else
+static inline int dev_to_node(struct device *dev)
+{
+        return -1;
+}
+static inline void set_dev_node(struct device *dev, int node)
+{
+}
+#endif
+
 static inline void *
 dev_get_drvdata (struct device *dev)
 {