powerpc/numa: Add form 1 NUMA affinity

Firmware changed the way it represents memory and cpu affinity on POWER7.
Unfortunately the old method now caps the topology to work around issues
with legacy operating systems. For Linux to get the correct topology we
need to use the new form 1 affinity information.

We set the form 1 field in the client architecture, and if we see "1" in the
ibm,associativity-form property firmware supports form 1 affinity and
we should look at the first field in the ibm,associativity-reference-points
array. If not we use the second field as we always have.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 5f306c4946e542bedf94001cc3eb0372032dba95..97d4bd9442d380ca8f65d66f28c6fe85892cc9f2 100644 (file)
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -653,6 +653,7 @@ static void __init early_cmdline_parse(void)
 #else
 #define OV5_CMO                        0x00
 #endif
+#define OV5_TYPE1_AFFINITY     0x80    /* Type 1 NUMA affinity */
 
 /* Option Vector 6: IBM PAPR hints */
 #define OV6_LINUX              0x02    /* Linux is our OS */
@@ -706,7 +707,7 @@ static unsigned char ibm_architecture_vec[] = {
        OV5_DONATE_DEDICATE_CPU | OV5_MSI,
        0,
        OV5_CMO,
-       0,
+       OV5_TYPE1_AFFINITY,
        0,
        0,
        0,

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 64c00227b99786cab5ae38d6513c73db1b13fd8f..eaa7633515b72064443333eb2b7ddeafcd462bf2 100644 (file)
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -242,10 +242,11 @@ EXPORT_SYMBOL_GPL(of_node_to_nid);
  */
 static int __init find_min_common_depth(void)
 {
-       int depth;
+       int depth, index;
        const unsigned int *ref_points;
        struct device_node *rtas_root;
        unsigned int len;
+       struct device_node *options;
 
        rtas_root = of_find_node_by_path("/rtas");
 
@@ -258,11 +259,23 @@ static int __init find_min_common_depth(void)
         * configuration (should be all 0's) and the second is for a normal
         * NUMA configuration.
         */
+       index = 1;
        ref_points = of_get_property(rtas_root,
                        "ibm,associativity-reference-points", &len);
 
+       /*
+        * For type 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;
+       }
+
        if ((len >= 2 * sizeof(unsigned int)) && ref_points) {
-               depth = ref_points[1];
+               depth = ref_points[index];
        } else {
                dbg("NUMA: ibm,associativity-reference-points not found.\n");
                depth = -1;