aboutsummaryrefslogtreecommitdiff
path: root/arch/x86_64/mm/numa.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86_64/mm/numa.c')
-rw-r--r--arch/x86_64/mm/numa.c398
1 files changed, 0 insertions, 398 deletions
diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
deleted file mode 100644
index 6ef9f9a7623..00000000000
--- a/arch/x86_64/mm/numa.c
+++ /dev/null
@@ -1,398 +0,0 @@
-/*
- * 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] __read_mostly;
-bootmem_data_t plat_node_bdata[MAX_NUMNODES];
-
-int memnode_shift;
-u8 memnodemap[NODEMAPSIZE];
-
-unsigned char cpu_to_node[NR_CPUS] __read_mostly = {
- [0 ... NR_CPUS-1] = NUMA_NO_NODE
-};
-unsigned char apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
- [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
-};
-cpumask_t node_to_cpumask[MAX_NUMNODES] __read_mostly;
-
-int numa_off __initdata;
-
-
-/*
- * Given a shift value, try to populate memnodemap[]
- * Returns :
- * 1 if OK
- * 0 if memnodmap[] too small (of shift too small)
- * -1 if node overlap or lost ram (shift too big)
- */
-static int __init
-populate_memnodemap(const struct node *nodes, int numnodes, int shift)
-{
- int i;
- int res = -1;
- unsigned long addr, end;
-
- if (shift >= 64)
- return -1;
- memset(memnodemap, 0xff, sizeof(memnodemap));
- for (i = 0; i < numnodes; i++) {
- addr = nodes[i].start;
- end = nodes[i].end;
- if (addr >= end)
- continue;
- if ((end >> shift) >= NODEMAPSIZE)
- return 0;
- do {
- if (memnodemap[addr >> shift] != 0xff)
- return -1;
- memnodemap[addr >> shift] = i;
- addr += (1UL << shift);
- } while (addr < end);
- res = 1;
- }
- return res;
-}
-
-int __init compute_hash_shift(struct node *nodes, int numnodes)
-{
- int shift = 20;
-
- while (populate_memnodemap(nodes, numnodes, shift + 1) >= 0)
- shift++;
-
- printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n",
- shift);
-
- if (populate_memnodemap(nodes, numnodes, shift) != 1) {
- printk(KERN_INFO
- "Your memory is not aligned you need to rebuild your kernel "
- "with a bigger NODEMAPSIZE shift=%d\n",
- shift);
- return -1;
- }
- return shift;
-}
-
-#ifdef CONFIG_SPARSEMEM
-int early_pfn_to_nid(unsigned long pfn)
-{
- return phys_to_nid(pfn << PAGE_SHIFT);
-}
-#endif
-
-/* 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(KERN_INFO "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 holes[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);
-
- size_zones(zones, holes, start_pfn, end_pfn);
- free_area_init_node(nodeid, NODE_DATA(nodeid), zones,
- start_pfn, holes);
-}
-
-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 = first_node(node_online_map);
- for (i = 0; i < NR_CPUS; i++) {
- if (cpu_to_node[i] != NUMA_NO_NODE)
- continue;
- numa_set_node(i, rr);
- rr = next_node(rr, node_online_map);
- if (rr == MAX_NUMNODES)
- rr = first_node(node_online_map);
- }
-
-}
-
-#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(KERN_ERR "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;
- 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++)
- numa_set_node(i, 0);
- node_to_cpumask[0] = cpumask_of_cpu(0);
- setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
-}
-
-__cpuinit void numa_add_cpu(int cpu)
-{
- set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
-}
-
-void __cpuinit numa_set_node(int cpu, int node)
-{
- cpu_pda(cpu)->nodenumber = node;
- cpu_to_node[cpu] = node;
-}
-
-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;
-}
-
-#ifdef CONFIG_SPARSEMEM
-static void __init arch_sparse_init(void)
-{
- int i;
-
- for_each_online_node(i)
- memory_present(i, node_start_pfn(i), node_end_pfn(i));
-
- sparse_init();
-}
-#else
-#define arch_sparse_init() do {} while (0)
-#endif
-
-void __init paging_init(void)
-{
- int i;
-
- arch_sparse_init();
-
- 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;
-}
-
-/*
- * Setup early cpu_to_node.
- *
- * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
- * and apicid_to_node[] tables have valid entries for a CPU.
- * This means we skip cpu_to_node[] initialisation for NUMA
- * emulation and faking node case (when running a kernel compiled
- * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
- * is already initialized in a round robin manner at numa_init_array,
- * prior to this call, and this initialization is good enough
- * for the fake NUMA cases.
- */
-void __init init_cpu_to_node(void)
-{
- int i;
- for (i = 0; i < NR_CPUS; i++) {
- u8 apicid = x86_cpu_to_apicid[i];
- if (apicid == BAD_APICID)
- continue;
- if (apicid_to_node[apicid] == NUMA_NO_NODE)
- continue;
- cpu_to_node[i] = apicid_to_node[apicid];
- }
-}
-
-EXPORT_SYMBOL(cpu_to_node);
-EXPORT_SYMBOL(node_to_cpumask);
-EXPORT_SYMBOL(memnode_shift);
-EXPORT_SYMBOL(memnodemap);
-EXPORT_SYMBOL(node_data);
-
-#ifdef CONFIG_DISCONTIGMEM
-/*
- * Functions to convert PFNs from/to per node page addresses.
- * These are out of line because they are quite big.
- * They could be all tuned by pre caching more state.
- * Should do that.
- */
-
-/* Requires pfn_valid(pfn) to be true */
-struct page *pfn_to_page(unsigned long pfn)
-{
- int nid = phys_to_nid(((unsigned long)(pfn)) << PAGE_SHIFT);
- return (pfn - node_start_pfn(nid)) + NODE_DATA(nid)->node_mem_map;
-}
-EXPORT_SYMBOL(pfn_to_page);
-
-unsigned long page_to_pfn(struct page *page)
-{
- return (long)(((page) - page_zone(page)->zone_mem_map) +
- page_zone(page)->zone_start_pfn);
-}
-EXPORT_SYMBOL(page_to_pfn);
-
-int pfn_valid(unsigned long pfn)
-{
- unsigned nid;
- if (pfn >= num_physpages)
- return 0;
- nid = pfn_to_nid(pfn);
- if (nid == 0xff)
- return 0;
- return pfn >= node_start_pfn(nid) && (pfn) < node_end_pfn(nid);
-}
-EXPORT_SYMBOL(pfn_valid);
-#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-09 22:26:04 +0000