arch/arm64/kernel/acpi_numa.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ACPI 5.1 based NUMA setup for ARM64
   4  * Lots of code was borrowed from arch/x86/mm/srat.c
   5  *
   6  * Copyright 2004 Andi Kleen, SuSE Labs.
   7  * Copyright (C) 2013-2016, Linaro Ltd.
   8  *              Author: Hanjun Guo <hanjun.guo@linaro.org>
   9  *
  10  * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
  11  *
  12  * Called from acpi_numa_init while reading the SRAT and SLIT tables.
  13  * Assumes all memory regions belonging to a single proximity domain
  14  * are in one chunk. Holes between them will be included in the node.
  15  */
  16
  17 #define pr_fmt(fmt) "ACPI: NUMA: " fmt
  18
  19 #include <linux/acpi.h>
  20 #include <linux/bitmap.h>
  21 #include <linux/bootmem.h>
  22 #include <linux/kernel.h>
  23 #include <linux/mm.h>
  24 #include <linux/memblock.h>
  25 #include <linux/mmzone.h>
  26 #include <linux/module.h>
  27 #include <linux/topology.h>
  28
  29 #include <acpi/processor.h>
  30 #include <asm/numa.h>
  31
  32 static int cpus_in_srat;
  33
  34 struct __node_cpu_hwid {
  35         u32 node_id;    /* logical node containing this CPU */
  36         u64 cpu_hwid;   /* MPIDR for this CPU */
  37 };
  38
  39 static struct __node_cpu_hwid early_node_cpu_hwid[NR_CPUS] = {
  40 [0 ... NR_CPUS - 1] = {NUMA_NO_NODE, PHYS_CPUID_INVALID} };
  41
  42 int acpi_numa_get_nid(unsigned int cpu, u64 hwid)
  43 {
  44         int i;
  45
  46         for (i = 0; i < cpus_in_srat; i++) {
  47                 if (hwid == early_node_cpu_hwid[i].cpu_hwid)
  48                         return early_node_cpu_hwid[i].node_id;
  49         }
  50
  51         return NUMA_NO_NODE;
  52 }
  53
  54 /* Callback for Proximity Domain -> ACPI processor UID mapping */
  55 void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
  56 {
  57         int pxm, node;
  58         phys_cpuid_t mpidr;
  59
  60         if (srat_disabled())
  61                 return;
  62
  63         if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
  64                 pr_err("SRAT: Invalid SRAT header length: %d\n",
  65                         pa->header.length);
  66                 bad_srat();
  67                 return;
  68         }
  69
  70         if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
  71                 return;
  72
  73         if (cpus_in_srat >= NR_CPUS) {
  74                 pr_warn_once("SRAT: cpu_to_node_map[%d] is too small, may not be able to use all cpus\n",
  75                              NR_CPUS);
  76                 return;
  77         }
  78
  79         pxm = pa->proximity_domain;
  80         node = acpi_map_pxm_to_node(pxm);
  81
  82         if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
  83                 pr_err("SRAT: Too many proximity domains %d\n", pxm);
  84                 bad_srat();
  85                 return;
  86         }
  87
  88         mpidr = acpi_map_madt_entry(pa->acpi_processor_uid);
  89         if (mpidr == PHYS_CPUID_INVALID) {
  90                 pr_err("SRAT: PXM %d with ACPI ID %d has no valid MPIDR in MADT\n",
  91                         pxm, pa->acpi_processor_uid);
  92                 bad_srat();
  93                 return;
  94         }
  95
  96         early_node_cpu_hwid[cpus_in_srat].node_id = node;
  97         early_node_cpu_hwid[cpus_in_srat].cpu_hwid =  mpidr;
  98         node_set(node, numa_nodes_parsed);
  99         cpus_in_srat++;
 100         pr_info("SRAT: PXM %d -> MPIDR 0x%Lx -> Node %d\n",
 101                 pxm, mpidr, node);
 102 }
 103
 104 int __init arm64_acpi_numa_init(void)
 105 {
 106         int ret;
 107
 108         ret = acpi_numa_init();
 109         if (ret) {
 110                 pr_info("Failed to initialise from firmware\n");
 111                 return ret;
 112         }
 113
 114         return srat_disabled() ? -EINVAL : 0;
 115 }