arch/arm64/kernel/acpi_numa.c

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