arch/x86/mm/srat_32.c

   1 /*
   2  * Some of the code in this file has been gleaned from the 64 bit
   3  * discontigmem support code base.
   4  *
   5  * Copyright (C) 2002, IBM Corp.
   6  *
   7  * All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  17  * NON INFRINGEMENT.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * Send feedback to Pat Gaughen <gone@us.ibm.com>
  25  */
  26 #include <linux/mm.h>
  27 #include <linux/bootmem.h>
  28 #include <linux/memblock.h>
  29 #include <linux/mmzone.h>
  30 #include <linux/acpi.h>
  31 #include <linux/nodemask.h>
  32 #include <asm/srat.h>
  33 #include <asm/topology.h>
  34 #include <asm/smp.h>
  35 #include <asm/e820.h>
  36
  37 /*
  38  * proximity macros and definitions
  39  */
  40 #define NODE_ARRAY_INDEX(x)     ((x) / 8)       /* 8 bits/char */
  41 #define NODE_ARRAY_OFFSET(x)    ((x) % 8)       /* 8 bits/char */
  42 #define BMAP_SET(bmap, bit)     ((bmap)[NODE_ARRAY_INDEX(bit)] |= 1 << NODE_ARRAY_OFFSET(bit))
  43 #define BMAP_TEST(bmap, bit)    ((bmap)[NODE_ARRAY_INDEX(bit)] & (1 << NODE_ARRAY_OFFSET(bit)))
  44 /* bitmap length; _PXM is at most 255 */
  45 #define PXM_BITMAP_LEN (MAX_PXM_DOMAINS / 8)
  46 static u8 __initdata pxm_bitmap[PXM_BITMAP_LEN];        /* bitmap of proximity domains */
  47
  48 #define MAX_CHUNKS_PER_NODE     3
  49 #define MAXCHUNKS               (MAX_CHUNKS_PER_NODE * MAX_NUMNODES)
  50 struct node_memory_chunk_s {
  51         unsigned long   start_pfn;
  52         unsigned long   end_pfn;
  53         u8      pxm;            // proximity domain of node
  54         u8      nid;            // which cnode contains this chunk?
  55         u8      bank;           // which mem bank on this node
  56 };
  57 static struct node_memory_chunk_s __initdata node_memory_chunk[MAXCHUNKS];
  58
  59 static int __initdata num_memory_chunks; /* total number of memory chunks */
  60 static u8 __initdata apicid_to_pxm[MAX_APICID];
  61
  62 int numa_off __initdata;
  63 int acpi_numa __initdata;
  64
  65 static __init void bad_srat(void)
  66 {
  67         printk(KERN_ERR "SRAT: SRAT not used.\n");
  68         acpi_numa = -1;
  69         num_memory_chunks = 0;
  70 }
  71
  72 static __init inline int srat_disabled(void)
  73 {
  74         return numa_off || acpi_numa < 0;
  75 }
  76
  77 /* Identify CPU proximity domains */
  78 void __init
  79 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *cpu_affinity)
  80 {
  81         if (srat_disabled())
  82                 return;
  83         if (cpu_affinity->header.length !=
  84              sizeof(struct acpi_srat_cpu_affinity)) {
  85                 bad_srat();
  86                 return;
  87         }
  88
  89         if ((cpu_affinity->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  90                 return;         /* empty entry */
  91
  92         /* mark this node as "seen" in node bitmap */
  93         BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo);
  94
  95         /* don't need to check apic_id here, because it is always 8 bits */
  96         apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;
  97
  98         printk(KERN_DEBUG "CPU %02x in proximity domain %02x\n",
  99                 cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
 100 }
 101
 102 /*
 103  * Identify memory proximity domains and hot-remove capabilities.
 104  * Fill node memory chunk list structure.
 105  */
 106 void __init
 107 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *memory_affinity)
 108 {
 109         unsigned long long paddr, size;
 110         unsigned long start_pfn, end_pfn;
 111         u8 pxm;
 112         struct node_memory_chunk_s *p, *q, *pend;
 113
 114         if (srat_disabled())
 115                 return;
 116         if (memory_affinity->header.length !=
 117              sizeof(struct acpi_srat_mem_affinity)) {
 118                 bad_srat();
 119                 return;
 120         }
 121
 122         if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
 123                 return;         /* empty entry */
 124
 125         pxm = memory_affinity->proximity_domain & 0xff;
 126
 127         /* mark this node as "seen" in node bitmap */
 128         BMAP_SET(pxm_bitmap, pxm);
 129
 130         /* calculate info for memory chunk structure */
 131         paddr = memory_affinity->base_address;
 132         size = memory_affinity->length;
 133
 134         start_pfn = paddr >> PAGE_SHIFT;
 135         end_pfn = (paddr + size) >> PAGE_SHIFT;
 136
 137
 138         if (num_memory_chunks >= MAXCHUNKS) {
 139                 printk(KERN_WARNING "Too many mem chunks in SRAT."
 140                         " Ignoring %lld MBytes at %llx\n",
 141                         size/(1024*1024), paddr);
 142                 return;
 143         }
 144
 145         /* Insertion sort based on base address */
 146         pend = &node_memory_chunk[num_memory_chunks];
 147         for (p = &node_memory_chunk[0]; p < pend; p++) {
 148                 if (start_pfn < p->start_pfn)
 149                         break;
 150         }
 151         if (p < pend) {
 152                 for (q = pend; q >= p; q--)
 153                         *(q + 1) = *q;
 154         }
 155         p->start_pfn = start_pfn;
 156         p->end_pfn = end_pfn;
 157         p->pxm = pxm;
 158
 159         num_memory_chunks++;
 160
 161         printk(KERN_DEBUG "Memory range %08lx to %08lx"
 162                           " in proximity domain %02x %s\n",
 163                 start_pfn, end_pfn,
 164                 pxm,
 165                 ((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
 166                  "enabled and removable" : "enabled" ) );
 167 }
 168
 169 /* Callback for SLIT parsing */
 170 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 171 {
 172 }
 173
 174 void acpi_numa_arch_fixup(void)
 175 {
 176 }
 177 /*
 178  * The SRAT table always lists ascending addresses, so can always
 179  * assume that the first "start" address that you see is the real
 180  * start of the node, and that the current "end" address is after
 181  * the previous one.
 182  */
 183 static __init int node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
 184 {
 185         /*
 186          * Only add present memory as told by the e820.
 187          * There is no guarantee from the SRAT that the memory it
 188          * enumerates is present at boot time because it represents
 189          * *possible* memory hotplug areas the same as normal RAM.
 190          */
 191         if (memory_chunk->start_pfn >= max_pfn) {
 192                 printk(KERN_INFO "Ignoring SRAT pfns: %08lx - %08lx\n",
 193                         memory_chunk->start_pfn, memory_chunk->end_pfn);
 194                 return -1;
 195         }
 196         if (memory_chunk->nid != nid)
 197                 return -1;
 198
 199         if (!node_has_online_mem(nid))
 200                 node_start_pfn[nid] = memory_chunk->start_pfn;
 201
 202         if (node_start_pfn[nid] > memory_chunk->start_pfn)
 203                 node_start_pfn[nid] = memory_chunk->start_pfn;
 204
 205         if (node_end_pfn[nid] < memory_chunk->end_pfn)
 206                 node_end_pfn[nid] = memory_chunk->end_pfn;
 207
 208         return 0;
 209 }
 210
 211 int __init get_memcfg_from_srat(void)
 212 {
 213         int i, j, nid;
 214
 215
 216         if (srat_disabled())
 217                 goto out_fail;
 218
 219         if (num_memory_chunks == 0) {
 220                 printk(KERN_DEBUG
 221                          "could not find any ACPI SRAT memory areas.\n");
 222                 goto out_fail;
 223         }
 224
 225         /* Calculate total number of nodes in system from PXM bitmap and create
 226          * a set of sequential node IDs starting at zero.  (ACPI doesn't seem
 227          * to specify the range of _PXM values.)
 228          */
 229         /*
 230          * MCD - we no longer HAVE to number nodes sequentially.  PXM domain
 231          * numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
 232          * 32, so we will continue numbering them in this manner until MAX_NUMNODES
 233          * approaches MAX_PXM_DOMAINS for i386.
 234          */
 235         nodes_clear(node_online_map);
 236         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 237                 if (BMAP_TEST(pxm_bitmap, i)) {
 238                         int nid = acpi_map_pxm_to_node(i);
 239                         node_set_online(nid);
 240                 }
 241         }
 242         BUG_ON(num_online_nodes() == 0);
 243
 244         /* set cnode id in memory chunk structure */
 245         for (i = 0; i < num_memory_chunks; i++)
 246                 node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);
 247
 248         printk(KERN_DEBUG "pxm bitmap: ");
 249         for (i = 0; i < sizeof(pxm_bitmap); i++) {
 250                 printk(KERN_CONT "%02x ", pxm_bitmap[i]);
 251         }
 252         printk(KERN_CONT "\n");
 253         printk(KERN_DEBUG "Number of logical nodes in system = %d\n",
 254                          num_online_nodes());
 255         printk(KERN_DEBUG "Number of memory chunks in system = %d\n",
 256                          num_memory_chunks);
 257
 258         for (i = 0; i < MAX_APICID; i++)
 259                 apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);
 260
 261         for (j = 0; j < num_memory_chunks; j++){
 262                 struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
 263                 printk(KERN_DEBUG
 264                         "chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
 265                        j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
 266                 if (node_read_chunk(chunk->nid, chunk))
 267                         continue;
 268
 269                 memblock_x86_register_active_regions(chunk->nid, chunk->start_pfn,
 270                                              min(chunk->end_pfn, max_pfn));
 271         }
 272         /* for out of order entries in SRAT */
 273         sort_node_map();
 274
 275         for_each_online_node(nid) {
 276                 unsigned long start = node_start_pfn[nid];
 277                 unsigned long end = min(node_end_pfn[nid], max_pfn);
 278
 279                 memory_present(nid, start, end);
 280                 node_remap_size[nid] = node_memmap_size_bytes(nid, start, end);
 281         }
 282         return 1;
 283 out_fail:
 284         printk(KERN_DEBUG "failed to get NUMA memory information from SRAT"
 285                         " table\n");
 286         return 0;
 287 }