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120 lines
2.8 KiB
120 lines
2.8 KiB
// 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 <[email protected]> |
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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/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(union acpi_subtable_headers *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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