arch/x86/kernel/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
  35 /*
  36  * proximity macros and definitions
  37  */
  38 #define NODE_ARRAY_INDEX(x)     ((x) / 8)       /* 8 bits/char */
  39 #define NODE_ARRAY_OFFSET(x)    ((x) % 8)       /* 8 bits/char */
  40 #define BMAP_SET(bmap, bit)     ((bmap)[NODE_ARRAY_INDEX(bit)] |= 1 << NODE_ARRAY_OFFSET(bit))
  41 #define BMAP_TEST(bmap, bit)    ((bmap)[NODE_ARRAY_INDEX(bit)] & (1 << NODE_ARRAY_OFFSET(bit)))
  42 /* bitmap length; _PXM is at most 255 */
  43 #define PXM_BITMAP_LEN (MAX_PXM_DOMAINS / 8)
  44 static u8 pxm_bitmap[PXM_BITMAP_LEN];   /* bitmap of proximity domains */
  45
  46 #define MAX_CHUNKS_PER_NODE     3
  47 #define MAXCHUNKS               (MAX_CHUNKS_PER_NODE * MAX_NUMNODES)
  48 struct node_memory_chunk_s {
  49         unsigned long   start_pfn;
  50         unsigned long   end_pfn;
  51         u8      pxm;            // proximity domain of node
  52         u8      nid;            // which cnode contains this chunk?
  53         u8      bank;           // which mem bank on this node
  54 };
  55 static struct node_memory_chunk_s node_memory_chunk[MAXCHUNKS];
  56
  57 static int num_memory_chunks;           /* total number of memory chunks */
  58 static u8 __initdata apicid_to_pxm[MAX_APICID];
  59
  60 /* Identify CPU proximity domains */
  61 static void __init parse_cpu_affinity_structure(char *p)
  62 {
  63         struct acpi_srat_cpu_affinity *cpu_affinity =
  64                                 (struct acpi_srat_cpu_affinity *) p;
  65
  66         if ((cpu_affinity->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  67                 return;         /* empty entry */
  68
  69         /* mark this node as "seen" in node bitmap */
  70         BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo);
  71
  72         apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;
  73
  74         printk("CPU 0x%02X in proximity domain 0x%02X\n",
  75                 cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
  76 }
  77
  78 /*
  79  * Identify memory proximity domains and hot-remove capabilities.
  80  * Fill node memory chunk list structure.
  81  */
  82 static void __init parse_memory_affinity_structure (char *sratp)
  83 {
  84         unsigned long long paddr, size;
  85         unsigned long start_pfn, end_pfn;
  86         u8 pxm;
  87         struct node_memory_chunk_s *p, *q, *pend;
  88         struct acpi_srat_mem_affinity *memory_affinity =
  89                         (struct acpi_srat_mem_affinity *) sratp;
  90
  91         if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
  92                 return;         /* empty entry */
  93
  94         pxm = memory_affinity->proximity_domain & 0xff;
  95
  96         /* mark this node as "seen" in node bitmap */
  97         BMAP_SET(pxm_bitmap, pxm);
  98
  99         /* calculate info for memory chunk structure */
 100         paddr = memory_affinity->base_address;
 101         size = memory_affinity->length;
 102
 103         start_pfn = paddr >> PAGE_SHIFT;
 104         end_pfn = (paddr + size) >> PAGE_SHIFT;
 105
 106
 107         if (num_memory_chunks >= MAXCHUNKS) {
 108                 printk("Too many mem chunks in SRAT. Ignoring %lld MBytes at %llx\n",
 109                         size/(1024*1024), paddr);
 110                 return;
 111         }
 112
 113         /* Insertion sort based on base address */
 114         pend = &node_memory_chunk[num_memory_chunks];
 115         for (p = &node_memory_chunk[0]; p < pend; p++) {
 116                 if (start_pfn < p->start_pfn)
 117                         break;
 118         }
 119         if (p < pend) {
 120                 for (q = pend; q >= p; q--)
 121                         *(q + 1) = *q;
 122         }
 123         p->start_pfn = start_pfn;
 124         p->end_pfn = end_pfn;
 125         p->pxm = pxm;
 126
 127         num_memory_chunks++;
 128
 129         printk("Memory range 0x%lX to 0x%lX (type 0x%X) in proximity domain 0x%02X %s\n",
 130                 start_pfn, end_pfn,
 131                 memory_affinity->memory_type,
 132                 pxm,
 133                 ((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
 134                  "enabled and removable" : "enabled" ) );
 135 }
 136
 137 /*
 138  * The SRAT table always lists ascending addresses, so can always
 139  * assume that the first "start" address that you see is the real
 140  * start of the node, and that the current "end" address is after
 141  * the previous one.
 142  */
 143 static __init void node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
 144 {
 145         /*
 146          * Only add present memory as told by the e820.
 147          * There is no guarantee from the SRAT that the memory it
 148          * enumerates is present at boot time because it represents
 149          * *possible* memory hotplug areas the same as normal RAM.
 150          */
 151         if (memory_chunk->start_pfn >= max_pfn) {
 152                 printk (KERN_INFO "Ignoring SRAT pfns: 0x%08lx -> %08lx\n",
 153                         memory_chunk->start_pfn, memory_chunk->end_pfn);
 154                 return;
 155         }
 156         if (memory_chunk->nid != nid)
 157                 return;
 158
 159         if (!node_has_online_mem(nid))
 160                 node_start_pfn[nid] = memory_chunk->start_pfn;
 161
 162         if (node_start_pfn[nid] > memory_chunk->start_pfn)
 163                 node_start_pfn[nid] = memory_chunk->start_pfn;
 164
 165         if (node_end_pfn[nid] < memory_chunk->end_pfn)
 166                 node_end_pfn[nid] = memory_chunk->end_pfn;
 167 }
 168
 169 /* Parse the ACPI Static Resource Affinity Table */
 170 static int __init acpi20_parse_srat(struct acpi_table_srat *sratp)
 171 {
 172         u8 *start, *end, *p;
 173         int i, j, nid;
 174
 175         start = (u8 *)(&(sratp->reserved) + 1); /* skip header */
 176         p = start;
 177         end = (u8 *)sratp + sratp->header.length;
 178
 179         memset(pxm_bitmap, 0, sizeof(pxm_bitmap));      /* init proximity domain bitmap */
 180         memset(node_memory_chunk, 0, sizeof(node_memory_chunk));
 181
 182         num_memory_chunks = 0;
 183         while (p < end) {
 184                 switch (*p) {
 185                 case ACPI_SRAT_TYPE_CPU_AFFINITY:
 186                         parse_cpu_affinity_structure(p);
 187                         break;
 188                 case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 189                         parse_memory_affinity_structure(p);
 190                         break;
 191                 default:
 192                         printk("ACPI 2.0 SRAT: unknown entry skipped: type=0x%02X, len=%d\n", p[0], p[1]);
 193                         break;
 194                 }
 195                 p += p[1];
 196                 if (p[1] == 0) {
 197                         printk("acpi20_parse_srat: Entry length value is zero;"
 198                                 " can't parse any further!\n");
 199                         break;
 200                 }
 201         }
 202
 203         if (num_memory_chunks == 0) {
 204                 printk("could not finy any ACPI SRAT memory areas.\n");
 205                 goto out_fail;
 206         }
 207
 208         /* Calculate total number of nodes in system from PXM bitmap and create
 209          * a set of sequential node IDs starting at zero.  (ACPI doesn't seem
 210          * to specify the range of _PXM values.)
 211          */
 212         /*
 213          * MCD - we no longer HAVE to number nodes sequentially.  PXM domain
 214          * numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
 215          * 32, so we will continue numbering them in this manner until MAX_NUMNODES
 216          * approaches MAX_PXM_DOMAINS for i386.
 217          */
 218         nodes_clear(node_online_map);
 219         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 220                 if (BMAP_TEST(pxm_bitmap, i)) {
 221                         int nid = acpi_map_pxm_to_node(i);
 222                         node_set_online(nid);
 223                 }
 224         }
 225         BUG_ON(num_online_nodes() == 0);
 226
 227         /* set cnode id in memory chunk structure */
 228         for (i = 0; i < num_memory_chunks; i++)
 229                 node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);
 230
 231         printk("pxm bitmap: ");
 232         for (i = 0; i < sizeof(pxm_bitmap); i++) {
 233                 printk("%02X ", pxm_bitmap[i]);
 234         }
 235         printk("\n");
 236         printk("Number of logical nodes in system = %d\n", num_online_nodes());
 237         printk("Number of memory chunks in system = %d\n", num_memory_chunks);
 238
 239         for (i = 0; i < MAX_APICID; i++)
 240                 apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);
 241
 242         for (j = 0; j < num_memory_chunks; j++){
 243                 struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
 244                 printk("chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
 245                        j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
 246                 node_read_chunk(chunk->nid, chunk);
 247                 add_active_range(chunk->nid, chunk->start_pfn, chunk->end_pfn);
 248         }
 249
 250         for_each_online_node(nid) {
 251                 unsigned long start = node_start_pfn[nid];
 252                 unsigned long end = node_end_pfn[nid];
 253
 254                 memory_present(nid, start, end);
 255                 node_remap_size[nid] = node_memmap_size_bytes(nid, start, end);
 256         }
 257         return 1;
 258 out_fail:
 259         return 0;
 260 }
 261
 262 struct acpi_static_rsdt {
 263         struct acpi_table_rsdt table;
 264         u32 padding[7]; /* Allow for 7 more table entries */
 265 };
 266
 267 int __init get_memcfg_from_srat(void)
 268 {
 269         struct acpi_table_header *header = NULL;
 270         struct acpi_table_rsdp *rsdp = NULL;
 271         struct acpi_table_rsdt *rsdt = NULL;
 272         acpi_native_uint rsdp_address = 0;
 273         struct acpi_static_rsdt saved_rsdt;
 274         int tables = 0;
 275         int i = 0;
 276
 277         rsdp_address = acpi_os_get_root_pointer();
 278         if (!rsdp_address) {
 279                 printk("%s: System description tables not found\n",
 280                        __func__);
 281                 goto out_err;
 282         }
 283
 284         printk("%s: assigning address to rsdp\n", __func__);
 285         rsdp = (struct acpi_table_rsdp *)(u32)rsdp_address;
 286         if (!rsdp) {
 287                 printk("%s: Didn't find ACPI root!\n", __func__);
 288                 goto out_err;
 289         }
 290
 291         printk(KERN_INFO "%.8s v%d [%.6s]\n", rsdp->signature, rsdp->revision,
 292                 rsdp->oem_id);
 293
 294         if (strncmp(rsdp->signature, ACPI_SIG_RSDP,strlen(ACPI_SIG_RSDP))) {
 295                 printk(KERN_WARNING "%s: RSDP table signature incorrect\n", __func__);
 296                 goto out_err;
 297         }
 298
 299         rsdt = (struct acpi_table_rsdt *)
 300             early_ioremap(rsdp->rsdt_physical_address, sizeof(struct acpi_table_rsdt));
 301
 302         if (!rsdt) {
 303                 printk(KERN_WARNING
 304                        "%s: ACPI: Invalid root system description tables (RSDT)\n",
 305                        __func__);
 306                 goto out_err;
 307         }
 308
 309         header = &rsdt->header;
 310
 311         if (strncmp(header->signature, ACPI_SIG_RSDT, strlen(ACPI_SIG_RSDT))) {
 312                 printk(KERN_WARNING "ACPI: RSDT signature incorrect\n");
 313                 goto out_err;
 314         }
 315
 316         /*
 317          * The number of tables is computed by taking the
 318          * size of all entries (header size minus total
 319          * size of RSDT) divided by the size of each entry
 320          * (4-byte table pointers).
 321          */
 322         tables = (header->length - sizeof(struct acpi_table_header)) / 4;
 323
 324         if (!tables)
 325                 goto out_err;
 326
 327         memcpy(&saved_rsdt, rsdt, sizeof(saved_rsdt));
 328
 329         if (saved_rsdt.table.header.length > sizeof(saved_rsdt)) {
 330                 printk(KERN_WARNING "ACPI: Too big length in RSDT: %d\n",
 331                        saved_rsdt.table.header.length);
 332                 goto out_err;
 333         }
 334
 335         printk("Begin SRAT table scan....\n");
 336
 337         for (i = 0; i < tables; i++) {
 338                 /* Map in header, then map in full table length. */
 339                 header = (struct acpi_table_header *)
 340                         early_ioremap(saved_rsdt.table.table_offset_entry[i], sizeof(struct acpi_table_header));
 341                 if (!header)
 342                         break;
 343                 header = (struct acpi_table_header *)
 344                         early_ioremap(saved_rsdt.table.table_offset_entry[i], header->length);
 345                 if (!header)
 346                         break;
 347
 348                 if (strncmp((char *) &header->signature, ACPI_SIG_SRAT, 4))
 349                         continue;
 350
 351                 /* we've found the srat table. don't need to look at any more tables */
 352                 return acpi20_parse_srat((struct acpi_table_srat *)header);
 353         }
 354 out_err:
 355         remove_all_active_ranges();
 356         printk("failed to get NUMA memory information from SRAT table\n");
 357         return 0;
 358 }