arch/mips/sgi-ip27/ip27-memory.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2000, 05 by Ralf Baechle (ralf@linux-mips.org)
   7  * Copyright (C) 2000 by Silicon Graphics, Inc.
   8  * Copyright (C) 2004 by Christoph Hellwig
   9  *
  10  * On SGI IP27 the ARC memory configuration data is completly bogus but
  11  * alternate easier to use mechanisms are available.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mm.h>
  16 #include <linux/mmzone.h>
  17 #include <linux/module.h>
  18 #include <linux/nodemask.h>
  19 #include <linux/swap.h>
  20 #include <linux/bootmem.h>
  21 #include <linux/pfn.h>
  22 #include <linux/highmem.h>
  23 #include <asm/page.h>
  24 #include <asm/pgalloc.h>
  25 #include <asm/sections.h>
  26
  27 #include <asm/sn/arch.h>
  28 #include <asm/sn/hub.h>
  29 #include <asm/sn/klconfig.h>
  30 #include <asm/sn/sn_private.h>
  31
  32
  33 #define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
  34 #define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)
  35
  36 struct node_data *__node_data[MAX_COMPACT_NODES];
  37
  38 EXPORT_SYMBOL(__node_data);
  39
  40 static int fine_mode;
  41
  42 static int is_fine_dirmode(void)
  43 {
  44         return (((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_REGIONSIZE_MASK)
  45                 >> NSRI_REGIONSIZE_SHFT) & REGIONSIZE_FINE);
  46 }
  47
  48 static hubreg_t get_region(cnodeid_t cnode)
  49 {
  50         if (fine_mode)
  51                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_FINEREG_SHFT;
  52         else
  53                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_COARSEREG_SHFT;
  54 }
  55
  56 static hubreg_t region_mask;
  57
  58 static void gen_region_mask(hubreg_t *region_mask)
  59 {
  60         cnodeid_t cnode;
  61
  62         (*region_mask) = 0;
  63         for_each_online_node(cnode) {
  64                 (*region_mask) |= 1ULL << get_region(cnode);
  65         }
  66 }
  67
  68 #define rou_rflag       rou_flags
  69
  70 static int router_distance;
  71
  72 static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
  73 {
  74         klrou_t *router;
  75         lboard_t *brd;
  76         int     port;
  77
  78         if (router_a->rou_rflag == 1)
  79                 return;
  80
  81         if (depth >= router_distance)
  82                 return;
  83
  84         router_a->rou_rflag = 1;
  85
  86         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
  87                 if (router_a->rou_port[port].port_nasid == INVALID_NASID)
  88                         continue;
  89
  90                 brd = (lboard_t *)NODE_OFFSET_TO_K0(
  91                         router_a->rou_port[port].port_nasid,
  92                         router_a->rou_port[port].port_offset);
  93
  94                 if (brd->brd_type == KLTYPE_ROUTER) {
  95                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
  96                         if (router == router_b) {
  97                                 if (depth < router_distance)
  98                                         router_distance = depth;
  99                         }
 100                         else
 101                                 router_recurse(router, router_b, depth + 1);
 102                 }
 103         }
 104
 105         router_a->rou_rflag = 0;
 106 }
 107
 108 unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
 109
 110 static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
 111 {
 112         klrou_t *router, *router_a = NULL, *router_b = NULL;
 113         lboard_t *brd, *dest_brd;
 114         cnodeid_t cnode;
 115         nasid_t nasid;
 116         int port;
 117
 118         /* Figure out which routers nodes in question are connected to */
 119         for_each_online_node(cnode) {
 120                 nasid = COMPACT_TO_NASID_NODEID(cnode);
 121
 122                 if (nasid == -1) continue;
 123
 124                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 125                                         KLTYPE_ROUTER);
 126
 127                 if (!brd)
 128                         continue;
 129
 130                 do {
 131                         if (brd->brd_flags & DUPLICATE_BOARD)
 132                                 continue;
 133
 134                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 135                         router->rou_rflag = 0;
 136
 137                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 138                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 139                                         continue;
 140
 141                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 142                                         router->rou_port[port].port_nasid,
 143                                         router->rou_port[port].port_offset);
 144
 145                                 if (dest_brd->brd_type == KLTYPE_IP27) {
 146                                         if (dest_brd->brd_nasid == nasid_a)
 147                                                 router_a = router;
 148                                         if (dest_brd->brd_nasid == nasid_b)
 149                                                 router_b = router;
 150                                 }
 151                         }
 152
 153                 } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
 154         }
 155
 156         if (router_a == NULL) {
 157                 printk("node_distance: router_a NULL\n");
 158                 return -1;
 159         }
 160         if (router_b == NULL) {
 161                 printk("node_distance: router_b NULL\n");
 162                 return -1;
 163         }
 164
 165         if (nasid_a == nasid_b)
 166                 return 0;
 167
 168         if (router_a == router_b)
 169                 return 1;
 170
 171         router_distance = 100;
 172         router_recurse(router_a, router_b, 2);
 173
 174         return router_distance;
 175 }
 176
 177 static void __init init_topology_matrix(void)
 178 {
 179         nasid_t nasid, nasid2;
 180         cnodeid_t row, col;
 181
 182         for (row = 0; row < MAX_COMPACT_NODES; row++)
 183                 for (col = 0; col < MAX_COMPACT_NODES; col++)
 184                         __node_distances[row][col] = -1;
 185
 186         for_each_online_node(row) {
 187                 nasid = COMPACT_TO_NASID_NODEID(row);
 188                 for_each_online_node(col) {
 189                         nasid2 = COMPACT_TO_NASID_NODEID(col);
 190                         __node_distances[row][col] =
 191                                 compute_node_distance(nasid, nasid2);
 192                 }
 193         }
 194 }
 195
 196 static void __init dump_topology(void)
 197 {
 198         nasid_t nasid;
 199         cnodeid_t cnode;
 200         lboard_t *brd, *dest_brd;
 201         int port;
 202         int router_num = 0;
 203         klrou_t *router;
 204         cnodeid_t row, col;
 205
 206         printk("************** Topology ********************\n");
 207
 208         printk("    ");
 209         for_each_online_node(col)
 210                 printk("%02d ", col);
 211         printk("\n");
 212         for_each_online_node(row) {
 213                 printk("%02d  ", row);
 214                 for_each_online_node(col)
 215                         printk("%2d ", node_distance(row, col));
 216                 printk("\n");
 217         }
 218
 219         for_each_online_node(cnode) {
 220                 nasid = COMPACT_TO_NASID_NODEID(cnode);
 221
 222                 if (nasid == -1) continue;
 223
 224                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 225                                         KLTYPE_ROUTER);
 226
 227                 if (!brd)
 228                         continue;
 229
 230                 do {
 231                         if (brd->brd_flags & DUPLICATE_BOARD)
 232                                 continue;
 233                         printk("Router %d:", router_num);
 234                         router_num++;
 235
 236                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 237
 238                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 239                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 240                                         continue;
 241
 242                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 243                                         router->rou_port[port].port_nasid,
 244                                         router->rou_port[port].port_offset);
 245
 246                                 if (dest_brd->brd_type == KLTYPE_IP27)
 247                                         printk(" %d", dest_brd->brd_nasid);
 248                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
 249                                         printk(" r");
 250                         }
 251                         printk("\n");
 252
 253                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
 254         }
 255 }
 256
 257 static pfn_t __init slot_getbasepfn(cnodeid_t cnode, int slot)
 258 {
 259         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
 260
 261         return ((pfn_t)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
 262 }
 263
 264 static pfn_t __init slot_psize_compute(cnodeid_t node, int slot)
 265 {
 266         nasid_t nasid;
 267         lboard_t *brd;
 268         klmembnk_t *banks;
 269         unsigned long size;
 270
 271         nasid = COMPACT_TO_NASID_NODEID(node);
 272         /* Find the node board */
 273         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
 274         if (!brd)
 275                 return 0;
 276
 277         /* Get the memory bank structure */
 278         banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
 279         if (!banks)
 280                 return 0;
 281
 282         /* Size in _Megabytes_ */
 283         size = (unsigned long)banks->membnk_bnksz[slot/4];
 284
 285         /* hack for 128 dimm banks */
 286         if (size <= 128) {
 287                 if (slot % 4 == 0) {
 288                         size <<= 20;            /* size in bytes */
 289                         return(size >> PAGE_SHIFT);
 290                 } else
 291                         return 0;
 292         } else {
 293                 size /= 4;
 294                 size <<= 20;
 295                 return size >> PAGE_SHIFT;
 296         }
 297 }
 298
 299 static void __init mlreset(void)
 300 {
 301         int i;
 302
 303         master_nasid = get_nasid();
 304         fine_mode = is_fine_dirmode();
 305
 306         /*
 307          * Probe for all CPUs - this creates the cpumask and sets up the
 308          * mapping tables.  We need to do this as early as possible.
 309          */
 310 #ifdef CONFIG_SMP
 311         cpu_node_probe();
 312 #endif
 313
 314         init_topology_matrix();
 315         dump_topology();
 316
 317         gen_region_mask(&region_mask);
 318
 319         setup_replication_mask();
 320
 321         /*
 322          * Set all nodes' calias sizes to 8k
 323          */
 324         for_each_online_node(i) {
 325                 nasid_t nasid;
 326
 327                 nasid = COMPACT_TO_NASID_NODEID(i);
 328
 329                 /*
 330                  * Always have node 0 in the region mask, otherwise
 331                  * CALIAS accesses get exceptions since the hub
 332                  * thinks it is a node 0 address.
 333                  */
 334                 REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
 335 #ifdef CONFIG_REPLICATE_EXHANDLERS
 336                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
 337 #else
 338                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
 339 #endif
 340
 341 #ifdef LATER
 342                 /*
 343                  * Set up all hubs to have a big window pointing at
 344                  * widget 0. Memory mode, widget 0, offset 0
 345                  */
 346                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
 347                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
 348                         (0 << IIO_ITTE_WIDGET_SHIFT)));
 349 #endif
 350         }
 351 }
 352
 353 static void __init szmem(void)
 354 {
 355         pfn_t slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
 356         int slot;
 357         cnodeid_t node;
 358
 359         num_physpages = 0;
 360
 361         for_each_online_node(node) {
 362                 nodebytes = 0;
 363                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
 364                         slot_psize = slot_psize_compute(node, slot);
 365                         if (slot == 0)
 366                                 slot0sz = slot_psize;
 367                         /*
 368                          * We need to refine the hack when we have replicated
 369                          * kernel text.
 370                          */
 371                         nodebytes += (1LL << SLOT_SHIFT);
 372
 373                         if (!slot_psize)
 374                                 continue;
 375
 376                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
 377                                                 (slot0sz << PAGE_SHIFT)) {
 378                                 printk("Ignoring slot %d onwards on node %d\n",
 379                                                                 slot, node);
 380                                 slot = MAX_MEM_SLOTS;
 381                                 continue;
 382                         }
 383                         num_physpages += slot_psize;
 384                         add_active_range(node, slot_getbasepfn(node, slot),
 385                                          slot_getbasepfn(node, slot) + slot_psize);
 386                 }
 387         }
 388 }
 389
 390 static void __init node_mem_init(cnodeid_t node)
 391 {
 392         pfn_t slot_firstpfn = slot_getbasepfn(node, 0);
 393         pfn_t slot_freepfn = node_getfirstfree(node);
 394         unsigned long bootmap_size;
 395         pfn_t start_pfn, end_pfn;
 396
 397         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 398
 399         /*
 400          * Allocate the node data structures on the node first.
 401          */
 402         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 403
 404         NODE_DATA(node)->bdata = &bootmem_node_data[node];
 405         NODE_DATA(node)->node_start_pfn = start_pfn;
 406         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
 407
 408         cpus_clear(hub_data(node)->h_cpus);
 409
 410         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
 411                                sizeof(struct hub_data));
 412
 413         bootmap_size = init_bootmem_node(NODE_DATA(node), slot_freepfn,
 414                                         start_pfn, end_pfn);
 415         free_bootmem_with_active_regions(node, end_pfn);
 416         reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
 417                 ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size,
 418                 BOOTMEM_DEFAULT);
 419         sparse_memory_present_with_active_regions(node);
 420 }
 421
 422 /*
 423  * A node with nothing.  We use it to avoid any special casing in
 424  * cpumask_of_node
 425  */
 426 static struct node_data null_node = {
 427         .hub = {
 428                 .h_cpus = CPU_MASK_NONE
 429         }
 430 };
 431
 432 /*
 433  * Currently, the intranode memory hole support assumes that each slot
 434  * contains at least 32 MBytes of memory. We assume all bootmem data
 435  * fits on the first slot.
 436  */
 437 void __init prom_meminit(void)
 438 {
 439         cnodeid_t node;
 440
 441         mlreset();
 442         szmem();
 443
 444         for (node = 0; node < MAX_COMPACT_NODES; node++) {
 445                 if (node_online(node)) {
 446                         node_mem_init(node);
 447                         continue;
 448                 }
 449                 __node_data[node] = &null_node;
 450         }
 451 }
 452
 453 void __init prom_free_prom_memory(void)
 454 {
 455         /* We got nothing to free here ...  */
 456 }
 457
 458 extern unsigned long setup_zero_pages(void);
 459
 460 void __init paging_init(void)
 461 {
 462         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 463         unsigned node;
 464
 465         pagetable_init();
 466
 467         for_each_online_node(node) {
 468                 pfn_t start_pfn, end_pfn;
 469
 470                 get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 471
 472                 if (end_pfn > max_low_pfn)
 473                         max_low_pfn = end_pfn;
 474         }
 475         zones_size[ZONE_NORMAL] = max_low_pfn;
 476         free_area_init_nodes(zones_size);
 477 }
 478
 479 void __init mem_init(void)
 480 {
 481         unsigned long codesize, datasize, initsize, tmp;
 482         unsigned node;
 483
 484         high_memory = (void *) __va(num_physpages << PAGE_SHIFT);
 485
 486         for_each_online_node(node) {
 487                 /*
 488                  * This will free up the bootmem, ie, slot 0 memory.
 489                  */
 490                 totalram_pages += free_all_bootmem_node(NODE_DATA(node));
 491         }
 492
 493         totalram_pages -= setup_zero_pages();   /* This comes from node 0 */
 494
 495         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 496         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 497         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 498
 499         tmp = nr_free_pages();
 500         printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 501                "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
 502                tmp << (PAGE_SHIFT-10),
 503                num_physpages << (PAGE_SHIFT-10),
 504                codesize >> 10,
 505                (num_physpages - tmp) << (PAGE_SHIFT-10),
 506                datasize >> 10,
 507                initsize >> 10,
 508                totalhigh_pages << (PAGE_SHIFT-10));
 509 }