--- /dev/null
- /* Setup online nodes to actual nodes*/
- node_possible_map = numa_nodes_parsed;
-
+ // SPDX-License-Identifier: GPL-2.0-only
+ /*
+ * NUMA support, based on the x86 implementation.
+ *
+ * Copyright (C) 2015 Cavium Inc.
+ * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
+ */
+
+ #define pr_fmt(fmt) "NUMA: " fmt
+
+ #include <linux/acpi.h>
+ #include <linux/memblock.h>
+ #include <linux/module.h>
+ #include <linux/of.h>
+ #include <linux/numa_memblks.h>
+
+ #include <asm/sections.h>
+
+ static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
+
+ bool numa_off;
+
+ static __init int numa_parse_early_param(char *opt)
+ {
+ if (!opt)
+ return -EINVAL;
+ if (str_has_prefix(opt, "off"))
+ numa_off = true;
+ if (!strncmp(opt, "fake=", 5))
+ return numa_emu_cmdline(opt + 5);
+
+ return 0;
+ }
+ early_param("numa", numa_parse_early_param);
+
+ cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
+ EXPORT_SYMBOL(node_to_cpumask_map);
+
+ #ifdef CONFIG_DEBUG_PER_CPU_MAPS
+
+ /*
+ * Returns a pointer to the bitmask of CPUs on Node 'node'.
+ */
+ const struct cpumask *cpumask_of_node(int node)
+ {
+
+ if (node == NUMA_NO_NODE)
+ return cpu_all_mask;
+
+ if (WARN_ON(node < 0 || node >= nr_node_ids))
+ return cpu_none_mask;
+
+ if (WARN_ON(node_to_cpumask_map[node] == NULL))
+ return cpu_online_mask;
+
+ return node_to_cpumask_map[node];
+ }
+ EXPORT_SYMBOL(cpumask_of_node);
+
+ #endif
+
+ #ifndef CONFIG_NUMA_EMU
+ static void numa_update_cpu(unsigned int cpu, bool remove)
+ {
+ int nid = cpu_to_node(cpu);
+
+ if (nid == NUMA_NO_NODE)
+ return;
+
+ if (remove)
+ cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
+ else
+ cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
+ }
+
+ void numa_add_cpu(unsigned int cpu)
+ {
+ numa_update_cpu(cpu, false);
+ }
+
+ void numa_remove_cpu(unsigned int cpu)
+ {
+ numa_update_cpu(cpu, true);
+ }
+ #endif
+
+ void numa_clear_node(unsigned int cpu)
+ {
+ numa_remove_cpu(cpu);
+ set_cpu_numa_node(cpu, NUMA_NO_NODE);
+ }
+
+ /*
+ * Allocate node_to_cpumask_map based on number of available nodes
+ * Requires node_possible_map to be valid.
+ *
+ * Note: cpumask_of_node() is not valid until after this is done.
+ * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
+ */
+ static void __init setup_node_to_cpumask_map(void)
+ {
+ int node;
+
+ /* setup nr_node_ids if not done yet */
+ if (nr_node_ids == MAX_NUMNODES)
+ setup_nr_node_ids();
+
+ /*
+ * This check should never be true but it makes it clear to compilers
+ * that node_to_cpumask_map is bound by nr_node_ids, avoiding false
+ * positive fortify warnings when accessing node_to_cpumask_map in the
+ * for loop below.
+ */
+ if (unlikely(nr_node_ids > MAX_NUMNODES)) {
+ pr_err("nr_node_ids (%u) is larger than MAX_NUMNODES (%u)\n",
+ nr_node_ids, MAX_NUMNODES);
+ return;
+ }
+
+ /* allocate and clear the mapping */
+ for (node = 0; node < nr_node_ids; node++) {
+ alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
+ cpumask_clear(node_to_cpumask_map[node]);
+ }
+
+ /* cpumask_of_node() will now work */
+ pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
+ }
+
+ /*
+ * Set the cpu to node and mem mapping
+ */
+ void numa_store_cpu_info(unsigned int cpu)
+ {
+ set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
+ }
+
+ void __init early_map_cpu_to_node(unsigned int cpu, int nid)
+ {
+ /* fallback to node 0 */
+ if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
+ nid = 0;
+
+ cpu_to_node_map[cpu] = nid;
+
+ /*
+ * We should set the numa node of cpu0 as soon as possible, because it
+ * has already been set up online before. cpu_to_node(0) will soon be
+ * called.
+ */
+ if (!cpu)
+ set_cpu_numa_node(cpu, nid);
+ }
+
+ #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
+ unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
+ EXPORT_SYMBOL(__per_cpu_offset);
+
+ int early_cpu_to_node(int cpu)
+ {
+ return cpu_to_node_map[cpu];
+ }
+
+ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
+ {
+ return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
+ }
+
+ void __init setup_per_cpu_areas(void)
+ {
+ unsigned long delta;
+ unsigned int cpu;
+ int rc = -EINVAL;
+
+ if (pcpu_chosen_fc != PCPU_FC_PAGE) {
+ /*
+ * Always reserve area for module percpu variables. That's
+ * what the legacy allocator did.
+ */
+ rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
+ PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
+ pcpu_cpu_distance,
+ early_cpu_to_node);
+ #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
+ if (rc < 0)
+ pr_warn("PERCPU: %s allocator failed (%d), falling back to page size\n",
+ pcpu_fc_names[pcpu_chosen_fc], rc);
+ #endif
+ }
+
+ #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
+ if (rc < 0)
+ rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, early_cpu_to_node);
+ #endif
+ if (rc < 0)
+ panic("Failed to initialize percpu areas (err=%d).", rc);
+
+ delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
+ for_each_possible_cpu(cpu)
+ __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
+ }
+ #endif
+
+ /*
+ * Initialize NODE_DATA for a node on the local memory
+ */
+ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
+ {
+ if (start_pfn >= end_pfn)
+ pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
+
+ alloc_node_data(nid);
+
+ NODE_DATA(nid)->node_id = nid;
+ NODE_DATA(nid)->node_start_pfn = start_pfn;
+ NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
+ }
+
+ static int __init numa_register_nodes(void)
+ {
+ int nid;
+
+ /* Check the validity of the memblock/node mapping */
+ if (!memblock_validate_numa_coverage(0))
+ return -EINVAL;
+
+ /* Finally register nodes. */
+ for_each_node_mask(nid, numa_nodes_parsed) {
+ unsigned long start_pfn, end_pfn;
+
+ get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
+ setup_node_data(nid, start_pfn, end_pfn);
+ node_set_online(nid);
+ }
+
- node_set(0, numa_nodes_parsed);
+ return 0;
+ }
+
+ static int __init numa_init(int (*init_func)(void))
+ {
+ int ret;
+
+ ret = numa_memblks_init(init_func, /* memblock_force_top_down */ false);
+ if (ret < 0)
+ goto out_free_distance;
+
+ if (nodes_empty(numa_nodes_parsed)) {
+ pr_info("No NUMA configuration found\n");
+ ret = -EINVAL;
+ goto out_free_distance;
+ }
+
+ ret = numa_register_nodes();
+ if (ret < 0)
+ goto out_free_distance;
+
+ setup_node_to_cpumask_map();
+
+ return 0;
+ out_free_distance:
+ numa_reset_distance();
+ return ret;
+ }
+
+ /**
+ * 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 (node 0) and add memory blocks that cover all
+ * allowed memory. It is unlikely that this function fails.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+ static int __init dummy_numa_init(void)
+ {
+ phys_addr_t start = memblock_start_of_DRAM();
+ phys_addr_t end = memblock_end_of_DRAM() - 1;
+ int ret;
+
+ if (numa_off)
+ pr_info("NUMA disabled\n"); /* Forced off on command line. */
+ pr_info("Faking a node at [mem %pap-%pap]\n", &start, &end);
+
+ ret = numa_add_memblk(0, start, end + 1);
+ if (ret) {
+ pr_err("NUMA init failed\n");
+ return ret;
+ }
+
+ numa_off = true;
+ return 0;
+ }
+
+ #ifdef CONFIG_ACPI_NUMA
+ static int __init arch_acpi_numa_init(void)
+ {
+ int ret;
+
+ ret = acpi_numa_init();
+ if (ret) {
+ pr_debug("Failed to initialise from firmware\n");
+ return ret;
+ }
+
+ return srat_disabled() ? -EINVAL : 0;
+ }
+ #else
+ static int __init arch_acpi_numa_init(void)
+ {
+ return -EOPNOTSUPP;
+ }
+ #endif
+
+ /**
+ * arch_numa_init() - Initialize NUMA
+ *
+ * Try each configured NUMA initialization method until one succeeds. The
+ * last fallback is dummy single node config encompassing whole memory.
+ */
+ void __init arch_numa_init(void)
+ {
+ if (!numa_off) {
+ if (!acpi_disabled && !numa_init(arch_acpi_numa_init))
+ return;
+ if (acpi_disabled && !numa_init(of_numa_init))
+ return;
+ }
+
+ numa_init(dummy_numa_init);
+ }
+
+ #ifdef CONFIG_NUMA_EMU
+ void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys,
+ unsigned int nr_emu_nids)
+ {
+ int i, j;
+
+ /*
+ * Transform cpu_to_node_map table to use emulated nids by
+ * reverse-mapping phys_nid. The maps should always exist but fall
+ * back to zero just in case.
+ */
+ for (i = 0; i < ARRAY_SIZE(cpu_to_node_map); i++) {
+ if (cpu_to_node_map[i] == NUMA_NO_NODE)
+ continue;
+ for (j = 0; j < nr_emu_nids; j++)
+ if (cpu_to_node_map[i] == emu_nid_to_phys[j])
+ break;
+ cpu_to_node_map[i] = j < nr_emu_nids ? j : 0;
+ }
+ }
+
+ u64 __init numa_emu_dma_end(void)
+ {
+ return memblock_start_of_DRAM() + SZ_4G;
+ }
+
+ void debug_cpumask_set_cpu(unsigned int cpu, int node, bool enable)
+ {
+ struct cpumask *mask;
+
+ if (node == NUMA_NO_NODE)
+ return;
+
+ mask = node_to_cpumask_map[node];
+ if (!cpumask_available(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);
+
+ pr_debug("%s cpu %d node %d: mask now %*pbl\n",
+ enable ? "numa_add_cpu" : "numa_remove_cpu",
+ cpu, node, cpumask_pr_args(mask));
+ }
+ #endif /* CONFIG_NUMA_EMU */
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