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/mmzone.h>
  29 #include <linux/acpi.h>
  30 #include <linux/nodemask.h>
  31 #include <asm/srat.h>
  32 #include <asm/topology.h>
  33 #include <asm/smp.h>
  34 #include <asm/e820.h>
  35
  36 /*
  37  * proximity macros and definitions
  38  */
  39 #define NODE_ARRAY_INDEX(x)     ((x) / 8)       /* 8 bits/char */
  40 #define NODE_ARRAY_OFFSET(x)    ((x) % 8)       /* 8 bits/char */
  41 #define BMAP_SET(bmap, bit)     ((bmap)[NODE_ARRAY_INDEX(bit)] |= 1 << NODE_ARRAY_OFFSET(bit))
  42 #define BMAP_TEST(bmap, bit)    ((bmap)[NODE_ARRAY_INDEX(bit)] & (1 << NODE_ARRAY_OFFSET(bit)))
  43 /* bitmap length; _PXM is at most 255 */
  44 #define PXM_BITMAP_LEN (MAX_PXM_DOMAINS / 8)
  45 static u8 __initdata pxm_bitmap[PXM_BITMAP_LEN];        /* bitmap of proximity domains */
  46
  47 #define MAX_CHUNKS_PER_NODE     3
  48 #define MAXCHUNKS               (MAX_CHUNKS_PER_NODE * MAX_NUMNODES)
  49 struct node_memory_chunk_s {
  50         unsigned long   start_pfn;
  51         unsigned long   end_pfn;
  52         u8      pxm;            // proximity domain of node
  53         u8      nid;            // which cnode contains this chunk?
  54         u8      bank;           // which mem bank on this node
  55 };
  56 static struct node_memory_chunk_s __initdata node_memory_chunk[MAXCHUNKS];
  57
  58 static int __initdata num_memory_chunks; /* total number of memory chunks */
  59 static u8 __initdata apicid_to_pxm[MAX_APICID];
  60
  61 int numa_off __initdata;
  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         apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;
  95
  96         printk(KERN_DEBUG "CPU %02x in proximity domain %02x\n",
  97                 cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
  98 }
  99
 100 /*
 101  * Identify memory proximity domains and hot-remove capabilities.
 102  * Fill node memory chunk list structure.
 103  */
 104 void __init
 105 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *memory_affinity)
 106 {
 107         unsigned long long paddr, size;
 108         unsigned long start_pfn, end_pfn;
 109         u8 pxm;
 110         struct node_memory_chunk_s *p, *q, *pend;
 111
 112         if (srat_disabled())
 113                 return;
 114         if (memory_affinity->header.length !=
 115              sizeof(struct acpi_srat_mem_affinity)) {
 116                 bad_srat();
 117                 return;
 118         }
 119
 120         if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
 121                 return;         /* empty entry */
 122
 123         pxm = memory_affinity->proximity_domain & 0xff;
 124
 125         /* mark this node as "seen" in node bitmap */
 126         BMAP_SET(pxm_bitmap, pxm);
 127
 128         /* calculate info for memory chunk structure */
 129         paddr = memory_affinity->base_address;
 130         size = memory_affinity->length;
 131
 132         start_pfn = paddr >> PAGE_SHIFT;
 133         end_pfn = (paddr + size) >> PAGE_SHIFT;
 134
 135
 136         if (num_memory_chunks >= MAXCHUNKS) {
 137                 printk(KERN_WARNING "Too many mem chunks in SRAT."
 138                         " Ignoring %lld MBytes at %llx\n",
 139                         size/(1024*1024), paddr);
 140                 return;
 141         }
 142
 143         /* Insertion sort based on base address */
 144         pend = &node_memory_chunk[num_memory_chunks];
 145         for (p = &node_memory_chunk[0]; p < pend; p++) {
 146                 if (start_pfn < p->start_pfn)
 147                         break;
 148         }
 149         if (p < pend) {
 150                 for (q = pend; q >= p; q--)
 151                         *(q + 1) = *q;
 152         }
 153         p->start_pfn = start_pfn;
 154         p->end_pfn = end_pfn;
 155         p->pxm = pxm;
 156
 157         num_memory_chunks++;
 158
 159         printk(KERN_DEBUG "Memory range %08lx to %08lx"
 160                           " in proximity domain %02x %s\n",
 161                 start_pfn, end_pfn,
 162                 pxm,
 163                 ((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
 164                  "enabled and removable" : "enabled" ) );
 165 }
 166
 167 /* Callback for SLIT parsing */
 168 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 169 {
 170 }
 171
 172 void acpi_numa_arch_fixup(void)
 173 {
 174 }
 175 /*
 176  * The SRAT table always lists ascending addresses, so can always
 177  * assume that the first "start" address that you see is the real
 178  * start of the node, and that the current "end" address is after
 179  * the previous one.
 180  */
 181 static __init int node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
 182 {
 183         /*
 184          * Only add present memory as told by the e820.
 185          * There is no guarantee from the SRAT that the memory it
 186          * enumerates is present at boot time because it represents
 187          * *possible* memory hotplug areas the same as normal RAM.
 188          */
 189         if (memory_chunk->start_pfn >= max_pfn) {
 190                 printk(KERN_INFO "Ignoring SRAT pfns: %08lx - %08lx\n",
 191                         memory_chunk->start_pfn, memory_chunk->end_pfn);
 192                 return -1;
 193         }
 194         if (memory_chunk->nid != nid)
 195                 return -1;
 196
 197         if (!node_has_online_mem(nid))
 198                 node_start_pfn[nid] = memory_chunk->start_pfn;
 199
 200         if (node_start_pfn[nid] > memory_chunk->start_pfn)
 201                 node_start_pfn[nid] = memory_chunk->start_pfn;
 202
 203         if (node_end_pfn[nid] < memory_chunk->end_pfn)
 204                 node_end_pfn[nid] = memory_chunk->end_pfn;
 205
 206         return 0;
 207 }
 208
 209 int __init get_memcfg_from_srat(void)
 210 {
 211         int i, j, nid;
 212
 213
 214         if (srat_disabled())
 215                 goto out_fail;
 216
 217         if (num_memory_chunks == 0) {
 218                 printk(KERN_WARNING
 219                          "could not find any ACPI SRAT memory areas.\n");
 220                 goto out_fail;
 221         }
 222
 223         /* Calculate total number of nodes in system from PXM bitmap and create
 224          * a set of sequential node IDs starting at zero.  (ACPI doesn't seem
 225          * to specify the range of _PXM values.)
 226          */
 227         /*
 228          * MCD - we no longer HAVE to number nodes sequentially.  PXM domain
 229          * numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
 230          * 32, so we will continue numbering them in this manner until MAX_NUMNODES
 231          * approaches MAX_PXM_DOMAINS for i386.
 232          */
 233         nodes_clear(node_online_map);
 234         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 235                 if (BMAP_TEST(pxm_bitmap, i)) {
 236                         int nid = acpi_map_pxm_to_node(i);
 237                         node_set_online(nid);
 238                 }
 239         }
 240         BUG_ON(num_online_nodes() == 0);
 241
 242         /* set cnode id in memory chunk structure */
 243         for (i = 0; i < num_memory_chunks; i++)
 244                 node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);
 245
 246         printk(KERN_DEBUG "pxm bitmap: ");
 247         for (i = 0; i < sizeof(pxm_bitmap); i++) {
 248                 printk(KERN_CONT "%02x ", pxm_bitmap[i]);
 249         }
 250         printk(KERN_CONT "\n");
 251         printk(KERN_DEBUG "Number of logical nodes in system = %d\n",
 252                          num_online_nodes());
 253         printk(KERN_DEBUG "Number of memory chunks in system = %d\n",
 254                          num_memory_chunks);
 255
 256         for (i = 0; i < MAX_APICID; i++)
 257                 apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);
 258
 259         for (j = 0; j < num_memory_chunks; j++){
 260                 struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
 261                 printk(KERN_DEBUG
 262                         "chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
 263                        j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
 264                 if (node_read_chunk(chunk->nid, chunk))
 265                         continue;
 266
 267                 e820_register_active_regions(chunk->nid, chunk->start_pfn,
 268                                              min(chunk->end_pfn, max_pfn));
 269         }
 270
 271         for_each_online_node(nid) {
 272                 unsigned long start = node_start_pfn[nid];
 273                 unsigned long end = min(node_end_pfn[nid], max_pfn);
 274
 275                 memory_present(nid, start, end);
 276                 node_remap_size[nid] = node_memmap_size_bytes(nid, start, end);
 277         }
 278         return 1;
 279 out_fail:
 280         printk(KERN_ERR "failed to get NUMA memory information from SRAT"
 281                         " table\n");
 282         return 0;
 283 }