mm/numa.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <linux/memblock.h>
   4 #include <linux/printk.h>
   5 #include <linux/numa.h>
   6 #include <linux/numa_memblks.h>
   7
   8 struct pglist_data *node_data[MAX_NUMNODES];
   9 EXPORT_SYMBOL(node_data);
  10
  11 /* Allocate NODE_DATA for a node on the local memory */
  12 void __init alloc_node_data(int nid)
  13 {
  14         const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
  15         u64 nd_pa;
  16         void *nd;
  17         int tnid;
  18
  19         /* Allocate node data.  Try node-local memory and then any node. */
  20         nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
  21         if (!nd_pa)
  22                 panic("Cannot allocate %zu bytes for node %d data\n",
  23                       nd_size, nid);
  24         nd = __va(nd_pa);
  25
  26         /* report and initialize */
  27         pr_info("NODE_DATA(%d) allocated [mem %#010Lx-%#010Lx]\n", nid,
  28                 nd_pa, nd_pa + nd_size - 1);
  29         tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
  30         if (tnid != nid)
  31                 pr_info("    NODE_DATA(%d) on node %d\n", nid, tnid);
  32
  33         node_data[nid] = nd;
  34         memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
  35 }
  36
  37 void __init alloc_offline_node_data(int nid)
  38 {
  39         pg_data_t *pgdat;
  40
  41         pgdat = memblock_alloc(sizeof(*pgdat), SMP_CACHE_BYTES);
  42         if (!pgdat)
  43                 panic("Cannot allocate %zuB for node %d.\n",
  44                       sizeof(*pgdat), nid);
  45
  46         node_data[nid] = pgdat;
  47 }
  48
  49 /* Stub functions: */
  50
  51 #ifndef memory_add_physaddr_to_nid
  52 int memory_add_physaddr_to_nid(u64 start)
  53 {
  54         pr_info_once("Unknown online node for memory at 0x%llx, assuming node 0\n",
  55                         start);
  56         return 0;
  57 }
  58 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
  59 #endif
  60
  61 #ifndef phys_to_target_node
  62 int phys_to_target_node(u64 start)
  63 {
  64         pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n",
  65                         start);
  66         return 0;
  67 }
  68 EXPORT_SYMBOL_GPL(phys_to_target_node);
  69 #endif