897 строки
22 KiB
C
897 строки
22 KiB
C
/* Common code for 32 and 64-bit NUMA */
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#include <linux/acpi.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <linux/mmzone.h>
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#include <linux/ctype.h>
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#include <linux/nodemask.h>
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#include <linux/sched.h>
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#include <linux/topology.h>
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#include <asm/e820/api.h>
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#include <asm/proto.h>
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#include <asm/dma.h>
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#include <asm/amd_nb.h>
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#include "numa_internal.h"
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int numa_off;
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nodemask_t numa_nodes_parsed __initdata;
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struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
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EXPORT_SYMBOL(node_data);
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static struct numa_meminfo numa_meminfo
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#ifndef CONFIG_MEMORY_HOTPLUG
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__initdata
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#endif
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;
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static int numa_distance_cnt;
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static u8 *numa_distance;
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static __init int numa_setup(char *opt)
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{
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if (!opt)
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return -EINVAL;
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if (!strncmp(opt, "off", 3))
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numa_off = 1;
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#ifdef CONFIG_NUMA_EMU
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if (!strncmp(opt, "fake=", 5))
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numa_emu_cmdline(opt + 5);
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#endif
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#ifdef CONFIG_ACPI_NUMA
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if (!strncmp(opt, "noacpi", 6))
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acpi_numa = -1;
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#endif
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return 0;
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}
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early_param("numa", numa_setup);
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/*
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* apicid, cpu, node mappings
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*/
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s16 __apicid_to_node[MAX_LOCAL_APIC] = {
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[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
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};
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int numa_cpu_node(int cpu)
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{
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int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
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if (apicid != BAD_APICID)
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return __apicid_to_node[apicid];
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return NUMA_NO_NODE;
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}
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cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
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EXPORT_SYMBOL(node_to_cpumask_map);
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/*
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* Map cpu index to node index
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*/
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DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
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EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
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void numa_set_node(int cpu, int node)
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{
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int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
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/* early setting, no percpu area yet */
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if (cpu_to_node_map) {
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cpu_to_node_map[cpu] = node;
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return;
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}
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
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printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
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dump_stack();
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return;
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}
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#endif
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per_cpu(x86_cpu_to_node_map, cpu) = node;
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set_cpu_numa_node(cpu, node);
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}
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void numa_clear_node(int cpu)
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{
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numa_set_node(cpu, NUMA_NO_NODE);
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}
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/*
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* Allocate node_to_cpumask_map based on number of available nodes
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* Requires node_possible_map to be valid.
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*
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* Note: cpumask_of_node() is not valid until after this is done.
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* (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
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*/
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void __init setup_node_to_cpumask_map(void)
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{
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unsigned int node;
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/* setup nr_node_ids if not done yet */
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if (nr_node_ids == MAX_NUMNODES)
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setup_nr_node_ids();
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/* allocate the map */
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for (node = 0; node < nr_node_ids; node++)
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alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
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/* cpumask_of_node() will now work */
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pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
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}
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static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
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struct numa_meminfo *mi)
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{
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/* ignore zero length blks */
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if (start == end)
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return 0;
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/* whine about and ignore invalid blks */
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if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
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pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
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nid, start, end - 1);
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return 0;
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}
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if (mi->nr_blks >= NR_NODE_MEMBLKS) {
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pr_err("too many memblk ranges\n");
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return -EINVAL;
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}
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mi->blk[mi->nr_blks].start = start;
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mi->blk[mi->nr_blks].end = end;
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mi->blk[mi->nr_blks].nid = nid;
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mi->nr_blks++;
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return 0;
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}
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/**
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* numa_remove_memblk_from - Remove one numa_memblk from a numa_meminfo
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* @idx: Index of memblk to remove
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* @mi: numa_meminfo to remove memblk from
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*
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* Remove @idx'th numa_memblk from @mi by shifting @mi->blk[] and
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* decrementing @mi->nr_blks.
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*/
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void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
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{
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mi->nr_blks--;
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memmove(&mi->blk[idx], &mi->blk[idx + 1],
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(mi->nr_blks - idx) * sizeof(mi->blk[0]));
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}
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/**
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* numa_add_memblk - Add one numa_memblk to numa_meminfo
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* @nid: NUMA node ID of the new memblk
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* @start: Start address of the new memblk
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* @end: End address of the new memblk
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*
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* Add a new memblk to the default numa_meminfo.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int __init numa_add_memblk(int nid, u64 start, u64 end)
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{
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return numa_add_memblk_to(nid, start, end, &numa_meminfo);
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}
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/* Allocate NODE_DATA for a node on the local memory */
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static void __init alloc_node_data(int nid)
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{
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const size_t nd_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
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u64 nd_pa;
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void *nd;
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int tnid;
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/*
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* Allocate node data. Try node-local memory and then any node.
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* Never allocate in DMA zone.
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*/
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nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
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if (!nd_pa) {
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pr_err("Cannot find %zu bytes in any node (initial node: %d)\n",
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nd_size, nid);
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return;
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}
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nd = __va(nd_pa);
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/* report and initialize */
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printk(KERN_INFO "NODE_DATA(%d) allocated [mem %#010Lx-%#010Lx]\n", nid,
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nd_pa, nd_pa + nd_size - 1);
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tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
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if (tnid != nid)
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printk(KERN_INFO " NODE_DATA(%d) on node %d\n", nid, tnid);
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node_data[nid] = nd;
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memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
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node_set_online(nid);
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}
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/**
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* numa_cleanup_meminfo - Cleanup a numa_meminfo
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* @mi: numa_meminfo to clean up
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*
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* Sanitize @mi by merging and removing unnecessary memblks. Also check for
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* conflicts and clear unused memblks.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
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{
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const u64 low = 0;
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const u64 high = PFN_PHYS(max_pfn);
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int i, j, k;
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/* first, trim all entries */
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for (i = 0; i < mi->nr_blks; i++) {
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struct numa_memblk *bi = &mi->blk[i];
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/* make sure all blocks are inside the limits */
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bi->start = max(bi->start, low);
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bi->end = min(bi->end, high);
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/* and there's no empty or non-exist block */
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if (bi->start >= bi->end ||
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!memblock_overlaps_region(&memblock.memory,
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bi->start, bi->end - bi->start))
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numa_remove_memblk_from(i--, mi);
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}
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/* merge neighboring / overlapping entries */
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for (i = 0; i < mi->nr_blks; i++) {
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struct numa_memblk *bi = &mi->blk[i];
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for (j = i + 1; j < mi->nr_blks; j++) {
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struct numa_memblk *bj = &mi->blk[j];
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u64 start, end;
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/*
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* See whether there are overlapping blocks. Whine
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* about but allow overlaps of the same nid. They
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* will be merged below.
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*/
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if (bi->end > bj->start && bi->start < bj->end) {
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if (bi->nid != bj->nid) {
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pr_err("node %d [mem %#010Lx-%#010Lx] overlaps with node %d [mem %#010Lx-%#010Lx]\n",
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bi->nid, bi->start, bi->end - 1,
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bj->nid, bj->start, bj->end - 1);
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return -EINVAL;
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}
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pr_warn("Warning: node %d [mem %#010Lx-%#010Lx] overlaps with itself [mem %#010Lx-%#010Lx]\n",
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bi->nid, bi->start, bi->end - 1,
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bj->start, bj->end - 1);
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}
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/*
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* Join together blocks on the same node, holes
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* between which don't overlap with memory on other
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* nodes.
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*/
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if (bi->nid != bj->nid)
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continue;
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start = min(bi->start, bj->start);
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end = max(bi->end, bj->end);
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for (k = 0; k < mi->nr_blks; k++) {
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struct numa_memblk *bk = &mi->blk[k];
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if (bi->nid == bk->nid)
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continue;
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if (start < bk->end && end > bk->start)
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break;
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}
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if (k < mi->nr_blks)
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continue;
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printk(KERN_INFO "NUMA: Node %d [mem %#010Lx-%#010Lx] + [mem %#010Lx-%#010Lx] -> [mem %#010Lx-%#010Lx]\n",
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bi->nid, bi->start, bi->end - 1, bj->start,
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bj->end - 1, start, end - 1);
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bi->start = start;
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bi->end = end;
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numa_remove_memblk_from(j--, mi);
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}
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}
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/* clear unused ones */
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for (i = mi->nr_blks; i < ARRAY_SIZE(mi->blk); i++) {
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mi->blk[i].start = mi->blk[i].end = 0;
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mi->blk[i].nid = NUMA_NO_NODE;
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}
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return 0;
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}
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/*
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* Set nodes, which have memory in @mi, in *@nodemask.
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*/
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static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
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const struct numa_meminfo *mi)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
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if (mi->blk[i].start != mi->blk[i].end &&
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mi->blk[i].nid != NUMA_NO_NODE)
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node_set(mi->blk[i].nid, *nodemask);
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}
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/**
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* numa_reset_distance - Reset NUMA distance table
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*
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* The current table is freed. The next numa_set_distance() call will
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* create a new one.
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*/
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void __init numa_reset_distance(void)
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{
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size_t size = numa_distance_cnt * numa_distance_cnt * sizeof(numa_distance[0]);
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/* numa_distance could be 1LU marking allocation failure, test cnt */
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if (numa_distance_cnt)
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memblock_free(__pa(numa_distance), size);
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numa_distance_cnt = 0;
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numa_distance = NULL; /* enable table creation */
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}
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static int __init numa_alloc_distance(void)
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{
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nodemask_t nodes_parsed;
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size_t size;
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int i, j, cnt = 0;
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u64 phys;
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/* size the new table and allocate it */
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nodes_parsed = numa_nodes_parsed;
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numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
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for_each_node_mask(i, nodes_parsed)
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cnt = i;
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cnt++;
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size = cnt * cnt * sizeof(numa_distance[0]);
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phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
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size, PAGE_SIZE);
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if (!phys) {
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pr_warn("Warning: can't allocate distance table!\n");
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/* don't retry until explicitly reset */
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numa_distance = (void *)1LU;
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return -ENOMEM;
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}
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memblock_reserve(phys, size);
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numa_distance = __va(phys);
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numa_distance_cnt = cnt;
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/* fill with the default distances */
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for (i = 0; i < cnt; i++)
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for (j = 0; j < cnt; j++)
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numa_distance[i * cnt + j] = i == j ?
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LOCAL_DISTANCE : REMOTE_DISTANCE;
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printk(KERN_DEBUG "NUMA: Initialized distance table, cnt=%d\n", cnt);
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return 0;
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}
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/**
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* numa_set_distance - Set NUMA distance from one NUMA to another
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* @from: the 'from' node to set distance
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* @to: the 'to' node to set distance
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* @distance: NUMA distance
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*
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* Set the distance from node @from to @to to @distance. If distance table
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* doesn't exist, one which is large enough to accommodate all the currently
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* known nodes will be created.
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*
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* If such table cannot be allocated, a warning is printed and further
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* calls are ignored until the distance table is reset with
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* numa_reset_distance().
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*
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* If @from or @to is higher than the highest known node or lower than zero
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* at the time of table creation or @distance doesn't make sense, the call
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* is ignored.
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* This is to allow simplification of specific NUMA config implementations.
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*/
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void __init numa_set_distance(int from, int to, int distance)
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{
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if (!numa_distance && numa_alloc_distance() < 0)
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return;
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if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
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from < 0 || to < 0) {
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pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
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from, to, distance);
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return;
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}
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if ((u8)distance != distance ||
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(from == to && distance != LOCAL_DISTANCE)) {
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pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
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from, to, distance);
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return;
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}
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numa_distance[from * numa_distance_cnt + to] = distance;
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}
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int __node_distance(int from, int to)
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{
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if (from >= numa_distance_cnt || to >= numa_distance_cnt)
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return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
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return numa_distance[from * numa_distance_cnt + to];
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}
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EXPORT_SYMBOL(__node_distance);
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/*
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* Sanity check to catch more bad NUMA configurations (they are amazingly
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* common). Make sure the nodes cover all memory.
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*/
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static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
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{
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u64 numaram, e820ram;
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int i;
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numaram = 0;
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for (i = 0; i < mi->nr_blks; i++) {
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u64 s = mi->blk[i].start >> PAGE_SHIFT;
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u64 e = mi->blk[i].end >> PAGE_SHIFT;
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numaram += e - s;
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numaram -= __absent_pages_in_range(mi->blk[i].nid, s, e);
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if ((s64)numaram < 0)
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numaram = 0;
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}
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e820ram = max_pfn - absent_pages_in_range(0, max_pfn);
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/* We seem to lose 3 pages somewhere. Allow 1M of slack. */
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if ((s64)(e820ram - numaram) >= (1 << (20 - PAGE_SHIFT))) {
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printk(KERN_ERR "NUMA: nodes only cover %LuMB of your %LuMB e820 RAM. Not used.\n",
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(numaram << PAGE_SHIFT) >> 20,
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(e820ram << PAGE_SHIFT) >> 20);
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return false;
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}
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return true;
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}
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/*
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* Mark all currently memblock-reserved physical memory (which covers the
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* kernel's own memory ranges) as hot-unswappable.
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*/
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static void __init numa_clear_kernel_node_hotplug(void)
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{
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nodemask_t reserved_nodemask = NODE_MASK_NONE;
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struct memblock_region *mb_region;
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int i;
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/*
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* We have to do some preprocessing of memblock regions, to
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* make them suitable for reservation.
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*
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* At this time, all memory regions reserved by memblock are
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* used by the kernel, but those regions are not split up
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* along node boundaries yet, and don't necessarily have their
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* node ID set yet either.
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*
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* So iterate over all memory known to the x86 architecture,
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* and use those ranges to set the nid in memblock.reserved.
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* This will split up the memblock regions along node
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* boundaries and will set the node IDs as well.
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*/
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for (i = 0; i < numa_meminfo.nr_blks; i++) {
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struct numa_memblk *mb = numa_meminfo.blk + i;
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int ret;
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|
ret = memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
|
|
WARN_ON_ONCE(ret);
|
|
}
|
|
|
|
/*
|
|
* Now go over all reserved memblock regions, to construct a
|
|
* node mask of all kernel reserved memory areas.
|
|
*
|
|
* [ Note, when booting with mem=nn[kMG] or in a kdump kernel,
|
|
* numa_meminfo might not include all memblock.reserved
|
|
* memory ranges, because quirks such as trim_snb_memory()
|
|
* reserve specific pages for Sandy Bridge graphics. ]
|
|
*/
|
|
for_each_memblock(reserved, mb_region) {
|
|
if (mb_region->nid != MAX_NUMNODES)
|
|
node_set(mb_region->nid, reserved_nodemask);
|
|
}
|
|
|
|
/*
|
|
* Finally, clear the MEMBLOCK_HOTPLUG flag for all memory
|
|
* belonging to the reserved node mask.
|
|
*
|
|
* Note that this will include memory regions that reside
|
|
* on nodes that contain kernel memory - entire nodes
|
|
* become hot-unpluggable:
|
|
*/
|
|
for (i = 0; i < numa_meminfo.nr_blks; i++) {
|
|
struct numa_memblk *mb = numa_meminfo.blk + i;
|
|
|
|
if (!node_isset(mb->nid, reserved_nodemask))
|
|
continue;
|
|
|
|
memblock_clear_hotplug(mb->start, mb->end - mb->start);
|
|
}
|
|
}
|
|
|
|
static int __init numa_register_memblks(struct numa_meminfo *mi)
|
|
{
|
|
unsigned long uninitialized_var(pfn_align);
|
|
int i, nid;
|
|
|
|
/* Account for nodes with cpus and no memory */
|
|
node_possible_map = numa_nodes_parsed;
|
|
numa_nodemask_from_meminfo(&node_possible_map, mi);
|
|
if (WARN_ON(nodes_empty(node_possible_map)))
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < mi->nr_blks; i++) {
|
|
struct numa_memblk *mb = &mi->blk[i];
|
|
memblock_set_node(mb->start, mb->end - mb->start,
|
|
&memblock.memory, mb->nid);
|
|
}
|
|
|
|
/*
|
|
* At very early time, the kernel have to use some memory such as
|
|
* loading the kernel image. We cannot prevent this anyway. So any
|
|
* node the kernel resides in should be un-hotpluggable.
|
|
*
|
|
* And when we come here, alloc node data won't fail.
|
|
*/
|
|
numa_clear_kernel_node_hotplug();
|
|
|
|
/*
|
|
* If sections array is gonna be used for pfn -> nid mapping, check
|
|
* whether its granularity is fine enough.
|
|
*/
|
|
#ifdef NODE_NOT_IN_PAGE_FLAGS
|
|
pfn_align = node_map_pfn_alignment();
|
|
if (pfn_align && pfn_align < PAGES_PER_SECTION) {
|
|
printk(KERN_WARNING "Node alignment %LuMB < min %LuMB, rejecting NUMA config\n",
|
|
PFN_PHYS(pfn_align) >> 20,
|
|
PFN_PHYS(PAGES_PER_SECTION) >> 20);
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
if (!numa_meminfo_cover_memory(mi))
|
|
return -EINVAL;
|
|
|
|
/* Finally register nodes. */
|
|
for_each_node_mask(nid, node_possible_map) {
|
|
u64 start = PFN_PHYS(max_pfn);
|
|
u64 end = 0;
|
|
|
|
for (i = 0; i < mi->nr_blks; i++) {
|
|
if (nid != mi->blk[i].nid)
|
|
continue;
|
|
start = min(mi->blk[i].start, start);
|
|
end = max(mi->blk[i].end, end);
|
|
}
|
|
|
|
if (start >= end)
|
|
continue;
|
|
|
|
/*
|
|
* Don't confuse VM with a node that doesn't have the
|
|
* minimum amount of memory:
|
|
*/
|
|
if (end && (end - start) < NODE_MIN_SIZE)
|
|
continue;
|
|
|
|
alloc_node_data(nid);
|
|
}
|
|
|
|
/* Dump memblock with node info and return. */
|
|
memblock_dump_all();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static void __init numa_init_array(void)
|
|
{
|
|
int rr, i;
|
|
|
|
rr = first_node(node_online_map);
|
|
for (i = 0; i < nr_cpu_ids; i++) {
|
|
if (early_cpu_to_node(i) != NUMA_NO_NODE)
|
|
continue;
|
|
numa_set_node(i, rr);
|
|
rr = next_node_in(rr, node_online_map);
|
|
}
|
|
}
|
|
|
|
static int __init numa_init(int (*init_func)(void))
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
for (i = 0; i < MAX_LOCAL_APIC; i++)
|
|
set_apicid_to_node(i, NUMA_NO_NODE);
|
|
|
|
nodes_clear(numa_nodes_parsed);
|
|
nodes_clear(node_possible_map);
|
|
nodes_clear(node_online_map);
|
|
memset(&numa_meminfo, 0, sizeof(numa_meminfo));
|
|
WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.memory,
|
|
MAX_NUMNODES));
|
|
WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.reserved,
|
|
MAX_NUMNODES));
|
|
/* In case that parsing SRAT failed. */
|
|
WARN_ON(memblock_clear_hotplug(0, ULLONG_MAX));
|
|
numa_reset_distance();
|
|
|
|
ret = init_func();
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* We reset memblock back to the top-down direction
|
|
* here because if we configured ACPI_NUMA, we have
|
|
* parsed SRAT in init_func(). It is ok to have the
|
|
* reset here even if we did't configure ACPI_NUMA
|
|
* or acpi numa init fails and fallbacks to dummy
|
|
* numa init.
|
|
*/
|
|
memblock_set_bottom_up(false);
|
|
|
|
ret = numa_cleanup_meminfo(&numa_meminfo);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
numa_emulation(&numa_meminfo, numa_distance_cnt);
|
|
|
|
ret = numa_register_memblks(&numa_meminfo);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < nr_cpu_ids; i++) {
|
|
int nid = early_cpu_to_node(i);
|
|
|
|
if (nid == NUMA_NO_NODE)
|
|
continue;
|
|
if (!node_online(nid))
|
|
numa_clear_node(i);
|
|
}
|
|
numa_init_array();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dummy_numa_init - Fallback dummy NUMA init
|
|
*
|
|
* Used if there's no underlying NUMA architecture, NUMA initialization
|
|
* fails, or NUMA is disabled on the command line.
|
|
*
|
|
* Must online at least one node and add memory blocks that cover all
|
|
* allowed memory. This function must not fail.
|
|
*/
|
|
static int __init dummy_numa_init(void)
|
|
{
|
|
printk(KERN_INFO "%s\n",
|
|
numa_off ? "NUMA turned off" : "No NUMA configuration found");
|
|
printk(KERN_INFO "Faking a node at [mem %#018Lx-%#018Lx]\n",
|
|
0LLU, PFN_PHYS(max_pfn) - 1);
|
|
|
|
node_set(0, numa_nodes_parsed);
|
|
numa_add_memblk(0, 0, PFN_PHYS(max_pfn));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* x86_numa_init - Initialize NUMA
|
|
*
|
|
* Try each configured NUMA initialization method until one succeeds. The
|
|
* last fallback is dummy single node config encomapssing whole memory and
|
|
* never fails.
|
|
*/
|
|
void __init x86_numa_init(void)
|
|
{
|
|
if (!numa_off) {
|
|
#ifdef CONFIG_ACPI_NUMA
|
|
if (!numa_init(x86_acpi_numa_init))
|
|
return;
|
|
#endif
|
|
#ifdef CONFIG_AMD_NUMA
|
|
if (!numa_init(amd_numa_init))
|
|
return;
|
|
#endif
|
|
}
|
|
|
|
numa_init(dummy_numa_init);
|
|
}
|
|
|
|
static void __init init_memory_less_node(int nid)
|
|
{
|
|
unsigned long zones_size[MAX_NR_ZONES] = {0};
|
|
unsigned long zholes_size[MAX_NR_ZONES] = {0};
|
|
|
|
/* Allocate and initialize node data. Memory-less node is now online.*/
|
|
alloc_node_data(nid);
|
|
free_area_init_node(nid, zones_size, 0, zholes_size);
|
|
|
|
/*
|
|
* All zonelists will be built later in start_kernel() after per cpu
|
|
* areas are initialized.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* Called before the per_cpu areas are setup.
|
|
*/
|
|
void __init init_cpu_to_node(void)
|
|
{
|
|
int cpu;
|
|
u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
|
|
|
|
BUG_ON(cpu_to_apicid == NULL);
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
int node = numa_cpu_node(cpu);
|
|
|
|
if (node == NUMA_NO_NODE)
|
|
continue;
|
|
|
|
if (!node_online(node))
|
|
init_memory_less_node(node);
|
|
|
|
numa_set_node(cpu, node);
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_DEBUG_PER_CPU_MAPS
|
|
|
|
# ifndef CONFIG_NUMA_EMU
|
|
void numa_add_cpu(int cpu)
|
|
{
|
|
cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
|
|
}
|
|
|
|
void numa_remove_cpu(int cpu)
|
|
{
|
|
cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
|
|
}
|
|
# endif /* !CONFIG_NUMA_EMU */
|
|
|
|
#else /* !CONFIG_DEBUG_PER_CPU_MAPS */
|
|
|
|
int __cpu_to_node(int cpu)
|
|
{
|
|
if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
|
|
printk(KERN_WARNING
|
|
"cpu_to_node(%d): usage too early!\n", cpu);
|
|
dump_stack();
|
|
return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
|
|
}
|
|
return per_cpu(x86_cpu_to_node_map, cpu);
|
|
}
|
|
EXPORT_SYMBOL(__cpu_to_node);
|
|
|
|
/*
|
|
* Same function as cpu_to_node() but used if called before the
|
|
* per_cpu areas are setup.
|
|
*/
|
|
int early_cpu_to_node(int cpu)
|
|
{
|
|
if (early_per_cpu_ptr(x86_cpu_to_node_map))
|
|
return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
|
|
|
|
if (!cpu_possible(cpu)) {
|
|
printk(KERN_WARNING
|
|
"early_cpu_to_node(%d): no per_cpu area!\n", cpu);
|
|
dump_stack();
|
|
return NUMA_NO_NODE;
|
|
}
|
|
return per_cpu(x86_cpu_to_node_map, cpu);
|
|
}
|
|
|
|
void debug_cpumask_set_cpu(int cpu, int node, bool enable)
|
|
{
|
|
struct cpumask *mask;
|
|
|
|
if (node == NUMA_NO_NODE) {
|
|
/* early_cpu_to_node() already emits a warning and trace */
|
|
return;
|
|
}
|
|
mask = node_to_cpumask_map[node];
|
|
if (!mask) {
|
|
pr_err("node_to_cpumask_map[%i] NULL\n", node);
|
|
dump_stack();
|
|
return;
|
|
}
|
|
|
|
if (enable)
|
|
cpumask_set_cpu(cpu, mask);
|
|
else
|
|
cpumask_clear_cpu(cpu, mask);
|
|
|
|
printk(KERN_DEBUG "%s cpu %d node %d: mask now %*pbl\n",
|
|
enable ? "numa_add_cpu" : "numa_remove_cpu",
|
|
cpu, node, cpumask_pr_args(mask));
|
|
return;
|
|
}
|
|
|
|
# ifndef CONFIG_NUMA_EMU
|
|
static void numa_set_cpumask(int cpu, bool enable)
|
|
{
|
|
debug_cpumask_set_cpu(cpu, early_cpu_to_node(cpu), enable);
|
|
}
|
|
|
|
void numa_add_cpu(int cpu)
|
|
{
|
|
numa_set_cpumask(cpu, true);
|
|
}
|
|
|
|
void numa_remove_cpu(int cpu)
|
|
{
|
|
numa_set_cpumask(cpu, false);
|
|
}
|
|
# endif /* !CONFIG_NUMA_EMU */
|
|
|
|
/*
|
|
* Returns a pointer to the bitmask of CPUs on Node 'node'.
|
|
*/
|
|
const struct cpumask *cpumask_of_node(int node)
|
|
{
|
|
if (node >= nr_node_ids) {
|
|
printk(KERN_WARNING
|
|
"cpumask_of_node(%d): node > nr_node_ids(%u)\n",
|
|
node, nr_node_ids);
|
|
dump_stack();
|
|
return cpu_none_mask;
|
|
}
|
|
if (node_to_cpumask_map[node] == NULL) {
|
|
printk(KERN_WARNING
|
|
"cpumask_of_node(%d): no node_to_cpumask_map!\n",
|
|
node);
|
|
dump_stack();
|
|
return cpu_online_mask;
|
|
}
|
|
return node_to_cpumask_map[node];
|
|
}
|
|
EXPORT_SYMBOL(cpumask_of_node);
|
|
|
|
#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
int memory_add_physaddr_to_nid(u64 start)
|
|
{
|
|
struct numa_meminfo *mi = &numa_meminfo;
|
|
int nid = mi->blk[0].nid;
|
|
int i;
|
|
|
|
for (i = 0; i < mi->nr_blks; i++)
|
|
if (mi->blk[i].start <= start && mi->blk[i].end > start)
|
|
nid = mi->blk[i].nid;
|
|
return nid;
|
|
}
|
|
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
|
|
#endif
|