sh: Support for multiple nodes.

This adds basic support for multiple nodes on SH machines.
This is primarily useful for boards with many different
memory blocks that are otherwise unused (SH7722/SH7785 URAM
and so forth).

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 76 insertions, 0 deletions

diff --git a/include/asm-sh/mmzone.h b/include/asm-sh/mmzone.h
new file mode 100644
index 000000000000..7969f381dff2
--- /dev/null
+++ b/include/asm-sh/mmzone.h
@@ -0,0 +1,46 @@
+#ifndef __ASM_SH_MMZONE_H
+#define __ASM_SH_MMZONE_H
+
+#ifdef __KERNEL__
+
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+extern struct pglist_data *node_data[];
+#define NODE_DATA(nid)          (node_data[nid])
+
+#define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
+#define node_end_pfn(nid)       (NODE_DATA(nid)->node_start_pfn + \
+                                 NODE_DATA(nid)->node_spanned_pages)
+
+static inline int pfn_to_nid(unsigned long pfn)
+{
+        int nid;
+
+        for (nid = 0; nid < MAX_NUMNODES; nid++)
+                if (pfn >= node_start_pfn(nid) && pfn <= node_end_pfn(nid))
+                        break;
+
+        return nid;
+}
+
+static inline struct pglist_data *pfn_to_pgdat(unsigned long pfn)
+{
+        return NODE_DATA(pfn_to_nid(pfn));
+}
+
+/* arch/sh/mm/numa.c */
+void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end);
+#else
+static inline void
+setup_bootmem_node(int nid, unsigned long start, unsigned long end)
+{
+}
+#endif /* CONFIG_NEED_MULTIPLE_NODES */
+
+/* Platform specific mem init */
+void __init plat_mem_setup(void);
+
+/* arch/sh/kernel/setup.c */
+void __init setup_bootmem_allocator(unsigned long start_pfn);
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_SH_MMZONE_H */
diff --git a/include/asm-sh/topology.h b/include/asm-sh/topology.h
index cff001c316fe..f402a3b1cfa4 100644
--- a/include/asm-sh/topology.h
+++ b/include/asm-sh/topology.h
@@ -1,6 +1,36 @@
 #ifndef _ASM_SH_TOPOLOGY_H
 #define _ASM_SH_TOPOLOGY_H
 
+#ifdef CONFIG_NUMA
+
+/* sched_domains SD_NODE_INIT for sh machines */
+#define SD_NODE_INIT (struct sched_domain) {            \
+        .span                   = CPU_MASK_NONE,        \
+        .parent                 = NULL,                 \
+        .child                  = NULL,                 \
+        .groups                 = NULL,                 \
+        .min_interval           = 8,                    \
+        .max_interval           = 32,                   \
+        .busy_factor            = 32,                   \
+        .imbalance_pct          = 125,                  \
+        .cache_nice_tries       = 2,                    \
+        .busy_idx               = 3,                    \
+        .idle_idx               = 2,                    \
+        .newidle_idx            = 0,                    \
+        .wake_idx               = 1,                    \
+        .forkexec_idx           = 1,                    \
+        .flags                  = SD_LOAD_BALANCE       \
+                                | SD_BALANCE_FORK       \
+                                | SD_BALANCE_EXEC       \
+                                | SD_SERIALIZE          \
+                                | SD_WAKE_BALANCE,      \
+        .last_balance           = jiffies,              \
+        .balance_interval       = 1,                    \
+        .nr_balance_failed      = 0,                    \
+}
+
+#endif
+
 #include <asm-generic/topology.h>
 
 #endif /* _ASM_SH_TOPOLOGY_H */