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_LOCAL_APIC];
  61
  62 int acpi_numa __initdata;
  63
  64 static __init void bad_srat(void)
  65 {
  66         printk(KERN_ERR "SRAT: SRAT not used.\n");
  67         acpi_numa = -1;
  68         num_memory_chunks = 0;
  69 }
  70
  71 static __init inline int srat_disabled(void)
  72 {
  73         return numa_off || acpi_numa < 0;
  74 }
  75
  76 /* Identify CPU proximity domains */
  77 void __init
  78 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *cpu_affinity)
  79 {
  80         if (srat_disabled())
  81                 return;
  82         if (cpu_affinity->header.length !=
  83              sizeof(struct acpi_srat_cpu_affinity)) {
  84                 bad_srat();
  85                 return;
  86         }
  87
  88         if ((cpu_affinity->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  89                 return;         /* empty entry */
  90
  91         /* mark this node as "seen" in node bitmap */
  92         BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo);
  93
  94         /* don't need to check apic_id here, because it is always 8 bits */
  95         apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;
  96
  97         printk(KERN_DEBUG "CPU %02x in proximity domain %02x\n",
  98                 cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
  99 }
 100
 101 /*
 102  * Identify memory proximity domains and hot-remove capabilities.
 103  * Fill node memory chunk list structure.
 104  */
 105 void __init
 106 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *memory_affinity)
 107 {
 108         unsigned long long paddr, size;
 109         unsigned long start_pfn, end_pfn;
 110         u8 pxm;
 111         struct node_memory_chunk_s *p, *q, *pend;
 112
 113         if (srat_disabled())
 114                 return;
 115         if (memory_affinity->header.length !=
 116              sizeof(struct acpi_srat_mem_affinity)) {
 117                 bad_srat();
 118                 return;
 119         }
 120
 121         if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
 122                 return;         /* empty entry */
 123
 124         pxm = memory_affinity->proximity_domain & 0xff;
 125
 126         /* mark this node as "seen" in node bitmap */
 127         BMAP_SET(pxm_bitmap, pxm);
 128
 129         /* calculate info for memory chunk structure */
 130         paddr = memory_affinity->base_address;
 131         size = memory_affinity->length;
 132
 133         start_pfn = paddr >> PAGE_SHIFT;
 134         end_pfn = (paddr + size) >> PAGE_SHIFT;
 135
 136
 137         if (num_memory_chunks >= MAXCHUNKS) {
 138                 printk(KERN_WARNING "Too many mem chunks in SRAT."
 139                         " Ignoring %lld MBytes at %llx\n",
 140                         size/(1024*1024), paddr);
 141                 return;
 142         }
 143
 144         /* Insertion sort based on base address */
 145         pend = &node_memory_chunk[num_memory_chunks];
 146         for (p = &node_memory_chunk[0]; p < pend; p++) {
 147                 if (start_pfn < p->start_pfn)
 148                         break;
 149         }
 150         if (p < pend) {
 151                 for (q = pend; q >= p; q--)
 152                         *(q + 1) = *q;
 153         }
 154         p->start_pfn = start_pfn;
 155         p->end_pfn = end_pfn;
 156         p->pxm = pxm;
 157
 158         num_memory_chunks++;
 159
 160         printk(KERN_DEBUG "Memory range %08lx to %08lx"
 161                           " in proximity domain %02x %s\n",
 162                 start_pfn, end_pfn,
 163                 pxm,
 164                 ((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
 165                  "enabled and removable" : "enabled" ) );
 166 }
 167
 168 /* Callback for SLIT parsing */
 169 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 170 {
 171 }
 172
 173 void acpi_numa_arch_fixup(void)
 174 {
 175 }
 176 /*
 177  * The SRAT table always lists ascending addresses, so can always
 178  * assume that the first "start" address that you see is the real
 179  * start of the node, and that the current "end" address is after
 180  * the previous one.
 181  */
 182 static __init int node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
 183 {
 184         /*
 185          * Only add present memory as told by the e820.
 186          * There is no guarantee from the SRAT that the memory it
 187          * enumerates is present at boot time because it represents
 188          * *possible* memory hotplug areas the same as normal RAM.
 189          */
 190         if (memory_chunk->start_pfn >= max_pfn) {
 191                 printk(KERN_INFO "Ignoring SRAT pfns: %08lx - %08lx\n",
 192                         memory_chunk->start_pfn, memory_chunk->end_pfn);
 193                 return -1;
 194         }
 195         if (memory_chunk->nid != nid)
 196                 return -1;
 197
 198         if (!node_has_online_mem(nid))
 199                 node_start_pfn[nid] = memory_chunk->start_pfn;
 200
 201         if (node_start_pfn[nid] > memory_chunk->start_pfn)
 202                 node_start_pfn[nid] = memory_chunk->start_pfn;
 203
 204         if (node_end_pfn[nid] < memory_chunk->end_pfn)
 205                 node_end_pfn[nid] = memory_chunk->end_pfn;
 206
 207         return 0;
 208 }
 209
 210 int __init get_memcfg_from_srat(void)
 211 {
 212         int i, j;
 213
 214         if (srat_disabled())
 215                 goto out_fail;
 216
 217         if (acpi_numa_init() < 0)
 218                 goto out_fail;
 219
 220         if (num_memory_chunks == 0) {
 221                 printk(KERN_DEBUG
 222                          "could not find any ACPI SRAT memory areas.\n");
 223                 goto out_fail;
 224         }
 225
 226         /* Calculate total number of nodes in system from PXM bitmap and create
 227          * a set of sequential node IDs starting at zero.  (ACPI doesn't seem
 228          * to specify the range of _PXM values.)
 229          */
 230         /*
 231          * MCD - we no longer HAVE to number nodes sequentially.  PXM domain
 232          * numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
 233          * 32, so we will continue numbering them in this manner until MAX_NUMNODES
 234          * approaches MAX_PXM_DOMAINS for i386.
 235          */
 236         nodes_clear(node_online_map);
 237         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 238                 if (BMAP_TEST(pxm_bitmap, i)) {
 239                         int nid = acpi_map_pxm_to_node(i);
 240                         node_set_online(nid);
 241                 }
 242         }
 243         BUG_ON(num_online_nodes() == 0);
 244
 245         /* set cnode id in memory chunk structure */
 246         for (i = 0; i < num_memory_chunks; i++)
 247                 node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);
 248
 249         printk(KERN_DEBUG "pxm bitmap: ");
 250         for (i = 0; i < sizeof(pxm_bitmap); i++) {
 251                 printk(KERN_CONT "%02x ", pxm_bitmap[i]);
 252         }
 253         printk(KERN_CONT "\n");
 254         printk(KERN_DEBUG "Number of logical nodes in system = %d\n",
 255                          num_online_nodes());
 256         printk(KERN_DEBUG "Number of memory chunks in system = %d\n",
 257                          num_memory_chunks);
 258
 259         for (i = 0; i < MAX_LOCAL_APIC; i++)
 260                 set_apicid_to_node(i, pxm_to_node(apicid_to_pxm[i]));
 261
 262         for (j = 0; j < num_memory_chunks; j++){
 263                 struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
 264                 printk(KERN_DEBUG
 265                         "chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
 266                        j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
 267                 if (node_read_chunk(chunk->nid, chunk))
 268                         continue;
 269
 270                 memblock_x86_register_active_regions(chunk->nid, chunk->start_pfn,
 271                                              min(chunk->end_pfn, max_pfn));
 272         }
 273         /* for out of order entries in SRAT */
 274         sort_node_map();
 275
 276         return 1;
 277 out_fail:
 278         printk(KERN_DEBUG "failed to get NUMA memory information from SRAT"
 279                         " table\n");
 280         return 0;
 281 }