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powerpc/numa: Use ibm,architecture-vec-5 to detect form 1 affinity 

I've been told that the architected way to determine we are in form 1
affinity mode is by reading the ibm,architecture-vec-5 property which
mirrors the layout of the fifth vector of the ibm,client-architecture
structure.

Eventually we may want to parse the ibm,architecture-vec-5 and create
FW_FEATURE_* bits.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-05-16 20:28:35 +00:00 committed by Benjamin Herrenschmidt
parent 56608209d3
commit bc8449cc57
1 changed files with 12 additions and 8 deletions
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20
arch/powerpc/mm/numa.c
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@ -271,7 +271,8 @@ static int __init find_min_common_depth(void)
const unsigned int *ref_points;
struct device_node *rtas_root;
unsigned int len;
struct device_node *options;
struct device_node *chosen;
const char *vec5;
rtas_root = of_find_node_by_path("/rtas");
@ -289,14 +290,17 @@ static int __init find_min_common_depth(void)
"ibm,associativity-reference-points", &len);
/*
* For type 1 affinity information we want the first field
* For form 1 affinity information we want the first field
*/
options = of_find_node_by_path("/options");
if (options) {
const char *str;
str = of_get_property(options, "ibm,associativity-form", NULL);
if (str && !strcmp(str, "1"))
index = 0;
#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");
index = 0;
}
}
if ((len >= 2 * sizeof(unsigned int)) && ref_points) {