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-rw-r--r--arch/x86_64/mm/numa.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
new file mode 100644
index 000000000000..fd9f25d7a6c4
--- /dev/null
+++ b/arch/x86_64/mm/numa.c
@@ -0,0 +1,294 @@
+/*
+ * Generic VM initialization for x86-64 NUMA setups.
+ * Copyright 2002,2003 Andi Kleen, SuSE Labs.
+ */
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/mmzone.h>
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/nodemask.h>
+
+#include <asm/e820.h>
+#include <asm/proto.h>
+#include <asm/dma.h>
+#include <asm/numa.h>
+#include <asm/acpi.h>
+
+#ifndef Dprintk
+#define Dprintk(x...)
+#endif
+
+struct pglist_data *node_data[MAX_NUMNODES];
+bootmem_data_t plat_node_bdata[MAX_NUMNODES];
+
+int memnode_shift;
+u8 memnodemap[NODEMAPSIZE];
+
+unsigned char cpu_to_node[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
+cpumask_t node_to_cpumask[MAX_NUMNODES];
+
+int numa_off __initdata;
+
+int __init compute_hash_shift(struct node *nodes, int numnodes)
+{
+ int i;
+ int shift = 24;
+ u64 addr;
+
+ /* When in doubt use brute force. */
+ while (shift < 48) {
+ memset(memnodemap,0xff,sizeof(*memnodemap) * NODEMAPSIZE);
+ for (i = 0; i < numnodes; i++) {
+ if (nodes[i].start == nodes[i].end)
+ continue;
+ for (addr = nodes[i].start;
+ addr < nodes[i].end;
+ addr += (1UL << shift)) {
+ if (memnodemap[addr >> shift] != 0xff &&
+ memnodemap[addr >> shift] != i) {
+ printk(KERN_INFO
+ "node %d shift %d addr %Lx conflict %d\n",
+ i, shift, addr, memnodemap[addr>>shift]);
+ goto next;
+ }
+ memnodemap[addr >> shift] = i;
+ }
+ }
+ return shift;
+ next:
+ shift++;
+ }
+ memset(memnodemap,0,sizeof(*memnodemap) * NODEMAPSIZE);
+ return -1;
+}
+
+/* Initialize bootmem allocator for a node */
+void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
+{
+ unsigned long start_pfn, end_pfn, bootmap_pages, bootmap_size, bootmap_start;
+ unsigned long nodedata_phys;
+ const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE);
+
+ start = round_up(start, ZONE_ALIGN);
+
+ printk("Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end);
+
+ start_pfn = start >> PAGE_SHIFT;
+ end_pfn = end >> PAGE_SHIFT;
+
+ nodedata_phys = find_e820_area(start, end, pgdat_size);
+ if (nodedata_phys == -1L)
+ panic("Cannot find memory pgdat in node %d\n", nodeid);
+
+ Dprintk("nodedata_phys %lx\n", nodedata_phys);
+
+ node_data[nodeid] = phys_to_virt(nodedata_phys);
+ memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t));
+ NODE_DATA(nodeid)->bdata = &plat_node_bdata[nodeid];
+ NODE_DATA(nodeid)->node_start_pfn = start_pfn;
+ NODE_DATA(nodeid)->node_spanned_pages = end_pfn - start_pfn;
+
+ /* Find a place for the bootmem map */
+ bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
+ bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE);
+ bootmap_start = find_e820_area(bootmap_start, end, bootmap_pages<<PAGE_SHIFT);
+ if (bootmap_start == -1L)
+ panic("Not enough continuous space for bootmap on node %d", nodeid);
+ Dprintk("bootmap start %lu pages %lu\n", bootmap_start, bootmap_pages);
+
+ bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
+ bootmap_start >> PAGE_SHIFT,
+ start_pfn, end_pfn);
+
+ e820_bootmem_free(NODE_DATA(nodeid), start, end);
+
+ reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size);
+ reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT);
+ node_set_online(nodeid);
+}
+
+/* Initialize final allocator for a zone */
+void __init setup_node_zones(int nodeid)
+{
+ unsigned long start_pfn, end_pfn;
+ unsigned long zones[MAX_NR_ZONES];
+ unsigned long dma_end_pfn;
+
+ memset(zones, 0, sizeof(unsigned long) * MAX_NR_ZONES);
+
+ start_pfn = node_start_pfn(nodeid);
+ end_pfn = node_end_pfn(nodeid);
+
+ Dprintk(KERN_INFO "setting up node %d %lx-%lx\n", nodeid, start_pfn, end_pfn);
+
+ /* All nodes > 0 have a zero length zone DMA */
+ dma_end_pfn = __pa(MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+ if (start_pfn < dma_end_pfn) {
+ zones[ZONE_DMA] = dma_end_pfn - start_pfn;
+ zones[ZONE_NORMAL] = end_pfn - dma_end_pfn;
+ } else {
+ zones[ZONE_NORMAL] = end_pfn - start_pfn;
+ }
+
+ free_area_init_node(nodeid, NODE_DATA(nodeid), zones,
+ start_pfn, NULL);
+}
+
+void __init numa_init_array(void)
+{
+ int rr, i;
+ /* There are unfortunately some poorly designed mainboards around
+ that only connect memory to a single CPU. This breaks the 1:1 cpu->node
+ mapping. To avoid this fill in the mapping for all possible
+ CPUs, as the number of CPUs is not known yet.
+ We round robin the existing nodes. */
+ rr = 0;
+ for (i = 0; i < NR_CPUS; i++) {
+ if (cpu_to_node[i] != NUMA_NO_NODE)
+ continue;
+ rr = next_node(rr, node_online_map);
+ if (rr == MAX_NUMNODES)
+ rr = first_node(node_online_map);
+ cpu_to_node[i] = rr;
+ rr++;
+ }
+
+ set_bit(0, &node_to_cpumask[cpu_to_node(0)]);
+}
+
+#ifdef CONFIG_NUMA_EMU
+int numa_fake __initdata = 0;
+
+/* Numa emulation */
+static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
+{
+ int i;
+ struct node nodes[MAX_NUMNODES];
+ unsigned long sz = ((end_pfn - start_pfn)<<PAGE_SHIFT) / numa_fake;
+
+ /* Kludge needed for the hash function */
+ if (hweight64(sz) > 1) {
+ unsigned long x = 1;
+ while ((x << 1) < sz)
+ x <<= 1;
+ if (x < sz/2)
+ printk("Numa emulation unbalanced. Complain to maintainer\n");
+ sz = x;
+ }
+
+ memset(&nodes,0,sizeof(nodes));
+ for (i = 0; i < numa_fake; i++) {
+ nodes[i].start = (start_pfn<<PAGE_SHIFT) + i*sz;
+ if (i == numa_fake-1)
+ sz = (end_pfn<<PAGE_SHIFT) - nodes[i].start;
+ nodes[i].end = nodes[i].start + sz;
+ if (i != numa_fake-1)
+ nodes[i].end--;
+ printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n",
+ i,
+ nodes[i].start, nodes[i].end,
+ (nodes[i].end - nodes[i].start) >> 20);
+ node_set_online(i);
+ }
+ memnode_shift = compute_hash_shift(nodes, numa_fake);
+ if (memnode_shift < 0) {
+ memnode_shift = 0;
+ printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n");
+ return -1;
+ }
+ for_each_online_node(i)
+ setup_node_bootmem(i, nodes[i].start, nodes[i].end);
+ numa_init_array();
+ return 0;
+}
+#endif
+
+void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
+{
+ int i;
+
+#ifdef CONFIG_NUMA_EMU
+ if (numa_fake && !numa_emulation(start_pfn, end_pfn))
+ return;
+#endif
+
+#ifdef CONFIG_ACPI_NUMA
+ if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
+ end_pfn << PAGE_SHIFT))
+ return;
+#endif
+
+#ifdef CONFIG_K8_NUMA
+ if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT))
+ return;
+#endif
+ printk(KERN_INFO "%s\n",
+ numa_off ? "NUMA turned off" : "No NUMA configuration found");
+
+ printk(KERN_INFO "Faking a node at %016lx-%016lx\n",
+ start_pfn << PAGE_SHIFT,
+ end_pfn << PAGE_SHIFT);
+ /* setup dummy node covering all memory */
+ memnode_shift = 63;
+ memnodemap[0] = 0;
+ nodes_clear(node_online_map);
+ node_set_online(0);
+ for (i = 0; i < NR_CPUS; i++)
+ cpu_to_node[i] = 0;
+ node_to_cpumask[0] = cpumask_of_cpu(0);
+ setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
+}
+
+__init void numa_add_cpu(int cpu)
+{
+ /* BP is initialized elsewhere */
+ if (cpu)
+ set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
+}
+
+unsigned long __init numa_free_all_bootmem(void)
+{
+ int i;
+ unsigned long pages = 0;
+ for_each_online_node(i) {
+ pages += free_all_bootmem_node(NODE_DATA(i));
+ }
+ return pages;
+}
+
+void __init paging_init(void)
+{
+ int i;
+ for_each_online_node(i) {
+ setup_node_zones(i);
+ }
+}
+
+/* [numa=off] */
+__init int numa_setup(char *opt)
+{
+ if (!strncmp(opt,"off",3))
+ numa_off = 1;
+#ifdef CONFIG_NUMA_EMU
+ if(!strncmp(opt, "fake=", 5)) {
+ numa_fake = simple_strtoul(opt+5,NULL,0); ;
+ if (numa_fake >= MAX_NUMNODES)
+ numa_fake = MAX_NUMNODES;
+ }
+#endif
+#ifdef CONFIG_ACPI_NUMA
+ if (!strncmp(opt,"noacpi",6))
+ acpi_numa = -1;
+#endif
+ return 1;
+}
+
+EXPORT_SYMBOL(cpu_to_node);
+EXPORT_SYMBOL(node_to_cpumask);
+EXPORT_SYMBOL(memnode_shift);
+EXPORT_SYMBOL(memnodemap);
+EXPORT_SYMBOL(node_data);
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