arch/x86/mm/srat.c

   1 /*
   2  * ACPI 3.0 based NUMA setup
   3  * Copyright 2004 Andi Kleen, SuSE Labs.
   4  *
   5  * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
   6  *
   7  * Called from acpi_numa_init while reading the SRAT and SLIT tables.
   8  * Assumes all memory regions belonging to a single proximity domain
   9  * are in one chunk. Holes between them will be included in the node.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/acpi.h>
  14 #include <linux/mmzone.h>
  15 #include <linux/bitmap.h>
  16 #include <linux/module.h>
  17 #include <linux/topology.h>
  18 #include <linux/bootmem.h>
  19 #include <linux/memblock.h>
  20 #include <linux/mm.h>
  21 #include <asm/proto.h>
  22 #include <asm/numa.h>
  23 #include <asm/e820.h>
  24 #include <asm/apic.h>
  25 #include <asm/uv/uv.h>
  26
  27 int acpi_numa __initdata;
  28
  29 static __init int setup_node(int pxm)
  30 {
  31         return acpi_map_pxm_to_node(pxm);
  32 }
  33
  34 static __init void bad_srat(void)
  35 {
  36         printk(KERN_ERR "SRAT: SRAT not used.\n");
  37         acpi_numa = -1;
  38 }
  39
  40 static __init inline int srat_disabled(void)
  41 {
  42         return acpi_numa < 0;
  43 }
  44
  45 /*
  46  * Callback for SLIT parsing.  pxm_to_node() returns NUMA_NO_NODE for
  47  * I/O localities since SRAT does not list them.  I/O localities are
  48  * not supported at this point.
  49  */
  50 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
  51 {
  52         int i, j;
  53
  54         for (i = 0; i < slit->locality_count; i++) {
  55                 if (pxm_to_node(i) == NUMA_NO_NODE)
  56                         continue;
  57                 for (j = 0; j < slit->locality_count; j++) {
  58                         if (pxm_to_node(j) == NUMA_NO_NODE)
  59                                 continue;
  60                         numa_set_distance(pxm_to_node(i), pxm_to_node(j),
  61                                 slit->entry[slit->locality_count * i + j]);
  62                 }
  63         }
  64 }
  65
  66 /* Callback for Proximity Domain -> x2APIC mapping */
  67 void __init
  68 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
  69 {
  70         int pxm, node;
  71         int apic_id;
  72
  73         if (srat_disabled())
  74                 return;
  75         if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
  76                 bad_srat();
  77                 return;
  78         }
  79         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  80                 return;
  81         pxm = pa->proximity_domain;
  82         apic_id = pa->apic_id;
  83         if (!apic->apic_id_valid(apic_id)) {
  84                 printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
  85                          pxm, apic_id);
  86                 return;
  87         }
  88         node = setup_node(pxm);
  89         if (node < 0) {
  90                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
  91                 bad_srat();
  92                 return;
  93         }
  94
  95         if (apic_id >= MAX_LOCAL_APIC) {
  96                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
  97                 return;
  98         }
  99         set_apicid_to_node(apic_id, node);
 100         node_set(node, numa_nodes_parsed);
 101         acpi_numa = 1;
 102         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
 103                pxm, apic_id, node);
 104 }
 105
 106 /* Callback for Proximity Domain -> LAPIC mapping */
 107 void __init
 108 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 109 {
 110         int pxm, node;
 111         int apic_id;
 112
 113         if (srat_disabled())
 114                 return;
 115         if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
 116                 bad_srat();
 117                 return;
 118         }
 119         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
 120                 return;
 121         pxm = pa->proximity_domain_lo;
 122         if (acpi_srat_revision >= 2)
 123                 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
 124         node = setup_node(pxm);
 125         if (node < 0) {
 126                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
 127                 bad_srat();
 128                 return;
 129         }
 130
 131         if (get_uv_system_type() >= UV_X2APIC)
 132                 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
 133         else
 134                 apic_id = pa->apic_id;
 135
 136         if (apic_id >= MAX_LOCAL_APIC) {
 137                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
 138                 return;
 139         }
 140
 141         set_apicid_to_node(apic_id, node);
 142         node_set(node, numa_nodes_parsed);
 143         acpi_numa = 1;
 144         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
 145                pxm, apic_id, node);
 146 }
 147
 148 #ifdef CONFIG_MEMORY_HOTPLUG
 149 static inline int save_add_info(void) {return 1;}
 150 #else
 151 static inline int save_add_info(void) {return 0;}
 152 #endif
 153
 154 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
 155 int __init
 156 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 157 {
 158         u64 start, end;
 159         u32 hotpluggable;
 160         int node, pxm;
 161
 162         if (srat_disabled())
 163                 goto out_err;
 164         if (ma->header.length != sizeof(struct acpi_srat_mem_affinity))
 165                 goto out_err_bad_srat;
 166         if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
 167                 goto out_err;
 168         hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
 169         if (hotpluggable && !save_add_info())
 170                 goto out_err;
 171
 172         start = ma->base_address;
 173         end = start + ma->length;
 174         pxm = ma->proximity_domain;
 175         if (acpi_srat_revision <= 1)
 176                 pxm &= 0xff;
 177
 178         node = setup_node(pxm);
 179         if (node < 0) {
 180                 printk(KERN_ERR "SRAT: Too many proximity domains.\n");
 181                 goto out_err_bad_srat;
 182         }
 183
 184         if (numa_add_memblk(node, start, end) < 0)
 185                 goto out_err_bad_srat;
 186
 187         node_set(node, numa_nodes_parsed);
 188
 189         pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s\n",
 190                 node, pxm,
 191                 (unsigned long long) start, (unsigned long long) end - 1,
 192                 hotpluggable ? " hotplug" : "");
 193
 194         /* Mark hotplug range in memblock. */
 195         if (hotpluggable && memblock_mark_hotplug(start, ma->length))
 196                 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",
 197                         (unsigned long long)start, (unsigned long long)end - 1);
 198
 199         return 0;
 200 out_err_bad_srat:
 201         bad_srat();
 202 out_err:
 203         return -1;
 204 }
 205
 206 void __init acpi_numa_arch_fixup(void) {}
 207
 208 int __init x86_acpi_numa_init(void)
 209 {
 210         int ret;
 211
 212         ret = acpi_numa_init();
 213         if (ret < 0)
 214                 return ret;
 215         return srat_disabled() ? -EINVAL : 0;
 216 }