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[PATCH] powerpc: Allow devices to register with numa topology

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Change of_node_to_nid() to traverse the device tree, looking for a numa id.
Cell uses this to assign ids to SPUs, which are children of the CPU node.
Existing users of of_node_to_nid() are altered to use of_node_to_nid_single(),
which doesn't do the traversal.

Export an attach_sysdev_to_node() function, allowing system devices (eg.
SPUs) to link themselves into the numa topology in sysfs.

Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeremy Kerr 2006-05-01 12:16:12 -07:00 committed by Linus Torvalds
parent bed120c64e
commit 953039c8df
3 changed files with 69 additions and 5 deletions
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18
arch/powerpc/kernel/sysfs.c
View File

@ -322,13 +322,31 @@ static void register_nodes(void)
}
}
}
int sysfs_add_device_to_node(struct sys_device *dev, int nid)
{
struct node *node = &node_devices[nid];
return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
kobject_name(&dev->kobj));
}
void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
{
struct node *node = &node_devices[nid];
sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
}
#else
static void register_nodes(void)
{
return;
}
#endif
EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
/* Only valid if CPU is present. */
static ssize_t show_physical_id(struct sys_device *dev, char *buf)
{

32
arch/powerpc/mm/numa.c
View File

@ -194,7 +194,7 @@ static int *of_get_associativity(struct device_node *dev)
/* Returns nid in the range [0..MAX_NUMNODES-1], or -1 if no useful numa
* info is found.
*/
static int of_node_to_nid(struct device_node *device)
static int of_node_to_nid_single(struct device_node *device)
{
int nid = -1;
unsigned int *tmp;
@ -216,6 +216,28 @@ static int of_node_to_nid(struct device_node *device)
return nid;
}
/* Walk the device tree upwards, looking for an associativity id */
int of_node_to_nid(struct device_node *device)
{
struct device_node *tmp;
int nid = -1;
of_node_get(device);
while (device) {
nid = of_node_to_nid_single(device);
if (nid != -1)
break;
tmp = device;
device = of_get_parent(tmp);
of_node_put(tmp);
}
of_node_put(device);
return nid;
}
EXPORT_SYMBOL_GPL(of_node_to_nid);
/*
* In theory, the "ibm,associativity" property may contain multiple
* associativity lists because a resource may be multiply connected
@ -300,7 +322,7 @@ static int __cpuinit numa_setup_cpu(unsigned long lcpu)
goto out;
}
nid = of_node_to_nid(cpu);
nid = of_node_to_nid_single(cpu);
if (nid < 0 || !node_online(nid))
nid = any_online_node(NODE_MASK_ALL);
@ -393,7 +415,7 @@ static int __init parse_numa_properties(void)
cpu = find_cpu_node(i);
BUG_ON(!cpu);
nid = of_node_to_nid(cpu);
nid = of_node_to_nid_single(cpu);
of_node_put(cpu);
/*
@ -437,7 +459,7 @@ static int __init parse_numa_properties(void)
* have associativity properties. If none, then
* everything goes to default_nid.
*/
nid = of_node_to_nid(memory);
nid = of_node_to_nid_single(memory);
if (nid < 0)
nid = default_nid;
node_set_online(nid);
@ -776,7 +798,7 @@ int hot_add_scn_to_nid(unsigned long scn_addr)
ha_new_range:
start = read_n_cells(n_mem_addr_cells, &memcell_buf);
size = read_n_cells(n_mem_size_cells, &memcell_buf);
nid = of_node_to_nid(memory);
nid = of_node_to_nid_single(memory);
/* Domains not present at boot default to 0 */
if (nid < 0 || !node_online(nid))

24
include/asm-powerpc/topology.h
View File

@ -4,6 +4,9 @@
#include <linux/config.h>
struct sys_device;
struct device_node;
#ifdef CONFIG_NUMA
#include <asm/mmzone.h>
@ -27,6 +30,8 @@ static inline int node_to_first_cpu(int node)
return first_cpu(tmp);
}
int of_node_to_nid(struct device_node *device);
#define pcibus_to_node(node) (-1)
#define pcibus_to_cpumask(bus) (cpu_online_map)
@ -57,10 +62,29 @@ static inline int node_to_first_cpu(int node)
extern void __init dump_numa_cpu_topology(void);
extern int sysfs_add_device_to_node(struct sys_device *dev, int nid);
extern void sysfs_remove_device_from_node(struct sys_device *dev, int nid);
#else
static inline int of_node_to_nid(struct device_node *device)
{
return 0;
}
static inline void dump_numa_cpu_topology(void) {}
static inline int sysfs_add_device_to_node(struct sys_device *dev, int nid)
{
return 0;
}
static inline void sysfs_remove_device_from_node(struct sys_device *dev,
int nid)
{
}
#include <asm-generic/topology.h>
#endif /* CONFIG_NUMA */