mirror of https://gitee.com/openkylin/linux.git
454 lines
11 KiB
C
454 lines
11 KiB
C
/*
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* NUMA support, based on the x86 implementation.
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*
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* Copyright (C) 2015 Cavium Inc.
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* Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) "NUMA: " fmt
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#include <linux/acpi.h>
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#include <linux/bootmem.h>
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#include <linux/memblock.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <asm/acpi.h>
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#include <asm/sections.h>
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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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nodemask_t numa_nodes_parsed __initdata;
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static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
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static int numa_distance_cnt;
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static u8 *numa_distance;
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bool numa_off;
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static __init int numa_parse_early_param(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 = true;
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return 0;
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}
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early_param("numa", numa_parse_early_param);
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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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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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/*
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* Returns a pointer to the bitmask of CPUs on Node 'node'.
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*/
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const struct cpumask *cpumask_of_node(int node)
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{
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if (WARN_ON(node >= nr_node_ids))
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return cpu_none_mask;
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if (WARN_ON(node_to_cpumask_map[node] == NULL))
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return cpu_online_mask;
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return node_to_cpumask_map[node];
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}
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EXPORT_SYMBOL(cpumask_of_node);
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#endif
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static void map_cpu_to_node(unsigned int cpu, int nid)
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{
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set_cpu_numa_node(cpu, nid);
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if (nid >= 0)
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cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
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}
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void numa_clear_node(unsigned int cpu)
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{
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int nid = cpu_to_node(cpu);
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if (nid >= 0)
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cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
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set_cpu_numa_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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static void __init setup_node_to_cpumask_map(void)
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{
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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 and clear the mapping */
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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_clear(node_to_cpumask_map[node]);
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}
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/* cpumask_of_node() will now work */
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pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids);
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}
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/*
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* Set the cpu to node and mem mapping
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*/
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void numa_store_cpu_info(unsigned int cpu)
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{
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map_cpu_to_node(cpu, cpu_to_node_map[cpu]);
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}
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void __init early_map_cpu_to_node(unsigned int cpu, int nid)
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{
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/* fallback to node 0 */
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if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
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nid = 0;
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cpu_to_node_map[cpu] = nid;
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/*
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* We should set the numa node of cpu0 as soon as possible, because it
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* has already been set up online before. cpu_to_node(0) will soon be
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* called.
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*/
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if (!cpu)
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set_cpu_numa_node(cpu, nid);
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}
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#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
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unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
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EXPORT_SYMBOL(__per_cpu_offset);
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static int __init early_cpu_to_node(int cpu)
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{
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return cpu_to_node_map[cpu];
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}
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static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
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{
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return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
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}
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static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
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size_t align)
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{
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int nid = early_cpu_to_node(cpu);
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return memblock_virt_alloc_try_nid(size, align,
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__pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
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}
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static void __init pcpu_fc_free(void *ptr, size_t size)
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{
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memblock_free_early(__pa(ptr), size);
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}
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void __init setup_per_cpu_areas(void)
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{
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unsigned long delta;
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unsigned int cpu;
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int rc;
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/*
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* Always reserve area for module percpu variables. That's
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* what the legacy allocator did.
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*/
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rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
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PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
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pcpu_cpu_distance,
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pcpu_fc_alloc, pcpu_fc_free);
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if (rc < 0)
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panic("Failed to initialize percpu areas.");
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delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
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for_each_possible_cpu(cpu)
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__per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
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}
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#endif
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/**
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* numa_add_memblk - Set node id to memblk
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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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* 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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int ret;
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ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
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if (ret < 0) {
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pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
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start, (end - 1), nid);
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return ret;
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}
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node_set(nid, numa_nodes_parsed);
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return ret;
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}
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/**
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* Initialize NODE_DATA for a node on the local memory
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*/
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static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
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{
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const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
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u64 nd_pa;
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void *nd;
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int tnid;
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if (start_pfn >= end_pfn)
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pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
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nd_pa = memblock_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
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nd = __va(nd_pa);
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/* report and initialize */
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pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n",
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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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pr_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_DATA(nid)->node_id = nid;
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NODE_DATA(nid)->node_start_pfn = start_pfn;
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NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
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}
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/**
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* numa_free_distance
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*
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* The current table is freed.
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*/
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void __init numa_free_distance(void)
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{
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size_t size;
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if (!numa_distance)
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return;
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size = numa_distance_cnt * numa_distance_cnt *
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sizeof(numa_distance[0]);
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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;
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}
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/**
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*
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* Create a new NUMA distance table.
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*
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*/
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static int __init numa_alloc_distance(void)
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{
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size_t size;
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u64 phys;
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int i, j;
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size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
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phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
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size, PAGE_SIZE);
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if (WARN_ON(!phys))
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return -ENOMEM;
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memblock_reserve(phys, size);
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numa_distance = __va(phys);
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numa_distance_cnt = nr_node_ids;
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/* fill with the default distances */
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for (i = 0; i < numa_distance_cnt; i++)
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for (j = 0; j < numa_distance_cnt; j++)
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numa_distance[i * numa_distance_cnt + j] = i == j ?
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LOCAL_DISTANCE : REMOTE_DISTANCE;
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pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
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return 0;
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}
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/**
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* numa_set_distance - Set inter node NUMA distance from node to node.
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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.
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* If distance table doesn't exist, a warning is printed.
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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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* or @distance doesn't make sense, the call is ignored.
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*
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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) {
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pr_warn_once("Warning: distance table not allocated yet\n");
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return;
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}
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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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/**
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* Return NUMA distance @from to @to
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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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static int __init numa_register_nodes(void)
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{
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int nid;
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struct memblock_region *mblk;
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/* Check that valid nid is set to memblks */
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for_each_memblock(memory, mblk)
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if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
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pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
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mblk->nid, mblk->base,
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mblk->base + mblk->size - 1);
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return -EINVAL;
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}
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/* Finally register nodes. */
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for_each_node_mask(nid, numa_nodes_parsed) {
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unsigned long start_pfn, end_pfn;
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get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
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setup_node_data(nid, start_pfn, end_pfn);
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node_set_online(nid);
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}
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/* Setup online nodes to actual nodes*/
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node_possible_map = numa_nodes_parsed;
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return 0;
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}
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static int __init numa_init(int (*init_func)(void))
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{
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int ret;
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nodes_clear(numa_nodes_parsed);
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nodes_clear(node_possible_map);
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nodes_clear(node_online_map);
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numa_free_distance();
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ret = numa_alloc_distance();
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if (ret < 0)
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return ret;
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ret = init_func();
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if (ret < 0)
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return ret;
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if (nodes_empty(numa_nodes_parsed)) {
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pr_info("No NUMA configuration found\n");
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return -EINVAL;
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}
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ret = numa_register_nodes();
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if (ret < 0)
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return ret;
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setup_node_to_cpumask_map();
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return 0;
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}
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/**
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* dummy_numa_init - Fallback dummy NUMA init
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*
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* Used if there's no underlying NUMA architecture, NUMA initialization
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* fails, or NUMA is disabled on the command line.
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*
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* Must online at least one node (node 0) and add memory blocks that cover all
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* allowed memory. It is unlikely that this function fails.
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*/
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static int __init dummy_numa_init(void)
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{
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int ret;
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struct memblock_region *mblk;
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if (numa_off)
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pr_info("NUMA disabled\n"); /* Forced off on command line. */
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pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n",
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0LLU, PFN_PHYS(max_pfn) - 1);
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for_each_memblock(memory, mblk) {
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ret = numa_add_memblk(0, mblk->base, mblk->base + mblk->size);
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if (!ret)
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continue;
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pr_err("NUMA init failed\n");
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return ret;
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}
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numa_off = true;
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return 0;
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}
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/**
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* arm64_numa_init - Initialize NUMA
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*
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* Try each configured NUMA initialization method until one succeeds. The
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* last fallback is dummy single node config encomapssing whole memory.
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*/
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void __init arm64_numa_init(void)
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{
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if (!numa_off) {
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if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
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return;
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if (acpi_disabled && !numa_init(of_numa_init))
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return;
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}
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numa_init(dummy_numa_init);
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}
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