Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / ia64 / mm / numa.c

diff --git a/kernel/arch/ia64/mm/numa.c b/kernel/arch/ia64/mm/numa.c
new file mode 100644 (file)
index 0000000..ea21d4c
--- /dev/null
+++ b/kernel/arch/ia64/mm/numa.c
@@ -0,0 +1,110 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * This file contains NUMA specific variables and functions which can
+ * be split away from DISCONTIGMEM and are used on NUMA machines with
+ * contiguous memory.
+ * 
+ *                         2002/08/07 Erich Focht <efocht@ess.nec.de>
+ */
+
+#include <linux/cpu.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/node.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/module.h>
+#include <asm/mmzone.h>
+#include <asm/numa.h>
+
+
+/*
+ * The following structures are usually initialized by ACPI or
+ * similar mechanisms and describe the NUMA characteristics of the machine.
+ */
+int num_node_memblks;
+struct node_memblk_s node_memblk[NR_NODE_MEMBLKS];
+struct node_cpuid_s node_cpuid[NR_CPUS] =
+       { [0 ... NR_CPUS-1] = { .phys_id = 0, .nid = NUMA_NO_NODE } };
+
+/*
+ * This is a matrix with "distances" between nodes, they should be
+ * proportional to the memory access latency ratios.
+ */
+u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES];
+
+/* Identify which cnode a physical address resides on */
+int
+paddr_to_nid(unsigned long paddr)
+{
+       int     i;
+
+       for (i = 0; i < num_node_memblks; i++)
+               if (paddr >= node_memblk[i].start_paddr &&
+                   paddr < node_memblk[i].start_paddr + node_memblk[i].size)
+                       break;
+
+       return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0);
+}
+
+#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA)
+/*
+ * Because of holes evaluate on section limits.
+ * If the section of memory exists, then return the node where the section
+ * resides.  Otherwise return node 0 as the default.  This is used by
+ * SPARSEMEM to allocate the SPARSEMEM sectionmap on the NUMA node where
+ * the section resides.
+ */
+int __meminit __early_pfn_to_nid(unsigned long pfn)
+{
+       int i, section = pfn >> PFN_SECTION_SHIFT, ssec, esec;
+       /*
+        * NOTE: The following SMP-unsafe globals are only used early in boot
+        * when the kernel is running single-threaded.
+        */
+       static int __meminitdata last_ssec, last_esec;
+       static int __meminitdata last_nid;
+
+       if (section >= last_ssec && section < last_esec)
+               return last_nid;
+
+       for (i = 0; i < num_node_memblks; i++) {
+               ssec = node_memblk[i].start_paddr >> PA_SECTION_SHIFT;
+               esec = (node_memblk[i].start_paddr + node_memblk[i].size +
+                       ((1L << PA_SECTION_SHIFT) - 1)) >> PA_SECTION_SHIFT;
+               if (section >= ssec && section < esec) {
+                       last_ssec = ssec;
+                       last_esec = esec;
+                       last_nid = node_memblk[i].nid;
+                       return node_memblk[i].nid;
+               }
+       }
+
+       return -1;
+}
+
+void numa_clear_node(int cpu)
+{
+       unmap_cpu_from_node(cpu, NUMA_NO_NODE);
+}
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+/*
+ *  SRAT information is stored in node_memblk[], then we can use SRAT
+ *  information at memory-hot-add if necessary.
+ */
+
+int memory_add_physaddr_to_nid(u64 addr)
+{
+       int nid = paddr_to_nid(addr);
+       if (nid < 0)
+               return 0;
+       return nid;
+}
+
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+#endif
+#endif