134 lines
3 KiB
C
134 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ACPI 5.1 based NUMA setup for ARM64
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* Lots of code was borrowed from arch/x86/mm/srat.c
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*
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* Copyright 2004 Andi Kleen, SuSE Labs.
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* Copyright (C) 2013-2016, Linaro Ltd.
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* Author: Hanjun Guo <hanjun.guo@linaro.org>
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*
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* Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
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*
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* Called from acpi_numa_init while reading the SRAT and SLIT tables.
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* Assumes all memory regions belonging to a single proximity domain
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* are in one chunk. Holes between them will be included in the node.
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*/
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#define pr_fmt(fmt) "ACPI: NUMA: " fmt
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#include <linux/acpi.h>
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#include <linux/bitmap.h>
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#include <linux/bootmem.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/memblock.h>
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#include <linux/mmzone.h>
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#include <linux/module.h>
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#include <linux/topology.h>
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#include <asm/numa.h>
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static int acpi_early_node_map[NR_CPUS] __initdata = { NUMA_NO_NODE };
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int __init acpi_numa_get_nid(unsigned int cpu)
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{
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return acpi_early_node_map[cpu];
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}
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static inline int get_cpu_for_acpi_id(u32 uid)
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{
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int cpu;
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for (cpu = 0; cpu < nr_cpu_ids; cpu++)
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if (uid == get_acpi_id_for_cpu(cpu))
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return cpu;
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return -EINVAL;
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}
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static int __init acpi_parse_gicc_pxm(struct acpi_subtable_header *header,
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const unsigned long end)
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{
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struct acpi_srat_gicc_affinity *pa;
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int cpu, pxm, node;
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if (srat_disabled())
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return -EINVAL;
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pa = (struct acpi_srat_gicc_affinity *)header;
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if (!pa)
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return -EINVAL;
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if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
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return 0;
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pxm = pa->proximity_domain;
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node = pxm_to_node(pxm);
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/*
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* If we can't map the UID to a logical cpu this
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* means that the UID is not part of possible cpus
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* so we do not need a NUMA mapping for it, skip
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* the SRAT entry and keep parsing.
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*/
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cpu = get_cpu_for_acpi_id(pa->acpi_processor_uid);
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if (cpu < 0)
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return 0;
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acpi_early_node_map[cpu] = node;
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pr_info("SRAT: PXM %d -> MPIDR 0x%llx -> Node %d\n", pxm,
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cpu_logical_map(cpu), node);
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return 0;
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}
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void __init acpi_map_cpus_to_nodes(void)
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{
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acpi_table_parse_entries(ACPI_SIG_SRAT, sizeof(struct acpi_table_srat),
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ACPI_SRAT_TYPE_GICC_AFFINITY,
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acpi_parse_gicc_pxm, 0);
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}
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/* Callback for Proximity Domain -> ACPI processor UID mapping */
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void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
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{
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int pxm, node;
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if (srat_disabled())
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return;
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if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
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pr_err("SRAT: Invalid SRAT header length: %d\n",
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pa->header.length);
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bad_srat();
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return;
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}
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if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
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return;
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pxm = pa->proximity_domain;
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node = acpi_map_pxm_to_node(pxm);
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if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
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pr_err("SRAT: Too many proximity domains %d\n", pxm);
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bad_srat();
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return;
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}
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node_set(node, numa_nodes_parsed);
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}
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int __init arm64_acpi_numa_init(void)
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{
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int ret;
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ret = acpi_numa_init();
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if (ret) {
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pr_info("Failed to initialise from firmware\n");
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return ret;
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}
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return srat_disabled() ? -EINVAL : 0;
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}
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