1 files changed, 65 insertions, 0 deletions

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 9da01dc8cfd9..262790910ff2 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -295,6 +295,63 @@ static unsigned long __init numa_enforce_memory_limit(unsigned long start,
         return lmb_end_of_DRAM() - start;
 }
 
+/*
+ * Extract NUMA information from the ibm,dynamic-reconfiguration-memory
+ * node.  This assumes n_mem_{addr,size}_cells have been set.
+ */
+static void __init parse_drconf_memory(struct device_node *memory)
+{
+        const unsigned int *lm, *dm, *aa;
+        unsigned int ls, ld, la;
+        unsigned int n, aam, aalen;
+        unsigned long lmb_size, size;
+        int nid, default_nid = 0;
+        unsigned int start, ai, flags;
+
+        lm = get_property(memory, "ibm,lmb-size", &ls);
+        dm = get_property(memory, "ibm,dynamic-memory", &ld);
+        aa = get_property(memory, "ibm,associativity-lookup-arrays", &la);
+        if (!lm || !dm || !aa ||
+            ls < sizeof(unsigned int) || ld < sizeof(unsigned int) ||
+            la < 2 * sizeof(unsigned int))
+                return;
+
+        lmb_size = read_n_cells(n_mem_size_cells, &lm);
+        n = *dm++;              /* number of LMBs */
+        aam = *aa++;            /* number of associativity lists */
+        aalen = *aa++;          /* length of each associativity list */
+        if (ld < (n * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int) ||
+            la < (aam * aalen + 2) * sizeof(unsigned int))
+                return;
+
+        for (; n != 0; --n) {
+                start = read_n_cells(n_mem_addr_cells, &dm);
+                ai = dm[2];
+                flags = dm[3];
+                dm += 4;
+                /* 0x80 == reserved, 0x8 = assigned to us */
+                if ((flags & 0x80) || !(flags & 0x8))
+                        continue;
+                nid = default_nid;
+                /* flags & 0x40 means associativity index is invalid */
+                if (min_common_depth > 0 && min_common_depth <= aalen &&
+                    (flags & 0x40) == 0 && ai < aam) {
+                        /* this is like of_node_to_nid_single */
+                        nid = aa[ai * aalen + min_common_depth - 1];
+                        if (nid == 0xffff || nid >= MAX_NUMNODES)
+                                nid = default_nid;
+                }
+                node_set_online(nid);
+
+                size = numa_enforce_memory_limit(start, lmb_size);
+                if (!size)
+                        continue;
+
+                add_active_range(nid, start >> PAGE_SHIFT,
+                                 (start >> PAGE_SHIFT) + (size >> PAGE_SHIFT));
+        }
+}
+
 static int __init parse_numa_properties(void)
 {
         struct device_node *cpu = NULL;
@@ -385,6 +442,14 @@ new_range:
                         goto new_range;
         }
 
+        /*
+         * Now do the same thing for each LMB listed in the ibm,dynamic-memory
+         * property in the ibm,dynamic-reconfiguration-memory node.
+         */
+        memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
+        if (memory)
+                parse_drconf_memory(memory);
+
         return 0;
 }