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powerpc/numa: NUMA topology support for PowerNV 

This patch adds support for numa topology on powernv platforms running
OPAL formware. It checks for the type of platform at run time and
sets the affinity form correctly so that NUMA topology can be discovered
correctly.

Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Dipankar Sarma 2011-10-28 04:25:32 +00:00 committed by Benjamin Herrenschmidt
parent c40dd2f766
commit 1c8ee73395
1 changed files with 17 additions and 7 deletions
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24
arch/powerpc/mm/numa.c
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@ -315,7 +315,10 @@ static int __init find_min_common_depth(void)
struct device_node *root;
const char *vec5;
root = of_find_node_by_path("/rtas");
if (firmware_has_feature(FW_FEATURE_OPAL))
root = of_find_node_by_path("/ibm,opal");
else
root = of_find_node_by_path("/rtas");
if (!root)
root = of_find_node_by_path("/");
@ -344,12 +347,19 @@ static int __init find_min_common_depth(void)
#define VEC5_AFFINITY_BYTE 5
#define VEC5_AFFINITY 0x80
chosen = of_find_node_by_path("/chosen");
if (chosen) {
vec5 = of_get_property(chosen, "ibm,architecture-vec-5", NULL);
if (vec5 && (vec5[VEC5_AFFINITY_BYTE] & VEC5_AFFINITY)) {
dbg("Using form 1 affinity\n");
form1_affinity = 1;
if (firmware_has_feature(FW_FEATURE_OPAL))
form1_affinity = 1;
else {
chosen = of_find_node_by_path("/chosen");
if (chosen) {
vec5 = of_get_property(chosen,
"ibm,architecture-vec-5", NULL);
if (vec5 && (vec5[VEC5_AFFINITY_BYTE] &
VEC5_AFFINITY)) {
dbg("Using form 1 affinity\n");
form1_affinity = 1;
}
}
}