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 #define SLOT_IGNORED            0xffff
  37
  38 static short __initdata slot_lastfilled_cache[MAX_COMPACT_NODES];
  39 static unsigned short __initdata slot_psize_cache[MAX_COMPACT_NODES][MAX_MEM_SLOTS];
  40 static struct bootmem_data __initdata plat_node_bdata[MAX_COMPACT_NODES];
  41
  42 struct node_data *__node_data[MAX_COMPACT_NODES];
  43
  44 EXPORT_SYMBOL(__node_data);
  45
  46 static int fine_mode;
  47
  48 static int is_fine_dirmode(void)
  49 {
  50         return (((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_REGIONSIZE_MASK)
  51                 >> NSRI_REGIONSIZE_SHFT) & REGIONSIZE_FINE);
  52 }
  53
  54 static hubreg_t get_region(cnodeid_t cnode)
  55 {
  56         if (fine_mode)
  57                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_FINEREG_SHFT;
  58         else
  59                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_COARSEREG_SHFT;
  60 }
  61
  62 static hubreg_t region_mask;
  63
  64 static void gen_region_mask(hubreg_t *region_mask)
  65 {
  66         cnodeid_t cnode;
  67
  68         (*region_mask) = 0;
  69         for_each_online_node(cnode) {
  70                 (*region_mask) |= 1ULL << get_region(cnode);
  71         }
  72 }
  73
  74 #define rou_rflag       rou_flags
  75
  76 static int router_distance;
  77
  78 static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
  79 {
  80         klrou_t *router;
  81         lboard_t *brd;
  82         int     port;
  83
  84         if (router_a->rou_rflag == 1)
  85                 return;
  86
  87         if (depth >= router_distance)
  88                 return;
  89
  90         router_a->rou_rflag = 1;
  91
  92         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
  93                 if (router_a->rou_port[port].port_nasid == INVALID_NASID)
  94                         continue;
  95
  96                 brd = (lboard_t *)NODE_OFFSET_TO_K0(
  97                         router_a->rou_port[port].port_nasid,
  98                         router_a->rou_port[port].port_offset);
  99
 100                 if (brd->brd_type == KLTYPE_ROUTER) {
 101                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 102                         if (router == router_b) {
 103                                 if (depth < router_distance)
 104                                         router_distance = depth;
 105                         }
 106                         else
 107                                 router_recurse(router, router_b, depth + 1);
 108                 }
 109         }
 110
 111         router_a->rou_rflag = 0;
 112 }
 113
 114 unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
 115
 116 static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
 117 {
 118         klrou_t *router, *router_a = NULL, *router_b = NULL;
 119         lboard_t *brd, *dest_brd;
 120         cnodeid_t cnode;
 121         nasid_t nasid;
 122         int port;
 123
 124         /* Figure out which routers nodes in question are connected to */
 125         for_each_online_node(cnode) {
 126                 nasid = COMPACT_TO_NASID_NODEID(cnode);
 127
 128                 if (nasid == -1) continue;
 129
 130                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 131                                         KLTYPE_ROUTER);
 132
 133                 if (!brd)
 134                         continue;
 135
 136                 do {
 137                         if (brd->brd_flags & DUPLICATE_BOARD)
 138                                 continue;
 139
 140                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 141                         router->rou_rflag = 0;
 142
 143                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 144                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 145                                         continue;
 146
 147                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 148                                         router->rou_port[port].port_nasid,
 149                                         router->rou_port[port].port_offset);
 150
 151                                 if (dest_brd->brd_type == KLTYPE_IP27) {
 152                                         if (dest_brd->brd_nasid == nasid_a)
 153                                                 router_a = router;
 154                                         if (dest_brd->brd_nasid == nasid_b)
 155                                                 router_b = router;
 156                                 }
 157                         }
 158
 159                 } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
 160         }
 161
 162         if (router_a == NULL) {
 163                 printk("node_distance: router_a NULL\n");
 164                 return -1;
 165         }
 166         if (router_b == NULL) {
 167                 printk("node_distance: router_b NULL\n");
 168                 return -1;
 169         }
 170
 171         if (nasid_a == nasid_b)
 172                 return 0;
 173
 174         if (router_a == router_b)
 175                 return 1;
 176
 177         router_distance = 100;
 178         router_recurse(router_a, router_b, 2);
 179
 180         return router_distance;
 181 }
 182
 183 static void __init init_topology_matrix(void)
 184 {
 185         nasid_t nasid, nasid2;
 186         cnodeid_t row, col;
 187
 188         for (row = 0; row < MAX_COMPACT_NODES; row++)
 189                 for (col = 0; col < MAX_COMPACT_NODES; col++)
 190                         __node_distances[row][col] = -1;
 191
 192         for_each_online_node(row) {
 193                 nasid = COMPACT_TO_NASID_NODEID(row);
 194                 for_each_online_node(col) {
 195                         nasid2 = COMPACT_TO_NASID_NODEID(col);
 196                         __node_distances[row][col] =
 197                                 compute_node_distance(nasid, nasid2);
 198                 }
 199         }
 200 }
 201
 202 static void __init dump_topology(void)
 203 {
 204         nasid_t nasid;
 205         cnodeid_t cnode;
 206         lboard_t *brd, *dest_brd;
 207         int port;
 208         int router_num = 0;
 209         klrou_t *router;
 210         cnodeid_t row, col;
 211
 212         printk("************** Topology ********************\n");
 213
 214         printk("    ");
 215         for_each_online_node(col)
 216                 printk("%02d ", col);
 217         printk("\n");
 218         for_each_online_node(row) {
 219                 printk("%02d  ", row);
 220                 for_each_online_node(col)
 221                         printk("%2d ", node_distance(row, col));
 222                 printk("\n");
 223         }
 224
 225         for_each_online_node(cnode) {
 226                 nasid = COMPACT_TO_NASID_NODEID(cnode);
 227
 228                 if (nasid == -1) continue;
 229
 230                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 231                                         KLTYPE_ROUTER);
 232
 233                 if (!brd)
 234                         continue;
 235
 236                 do {
 237                         if (brd->brd_flags & DUPLICATE_BOARD)
 238                                 continue;
 239                         printk("Router %d:", router_num);
 240                         router_num++;
 241
 242                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 243
 244                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 245                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 246                                         continue;
 247
 248                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 249                                         router->rou_port[port].port_nasid,
 250                                         router->rou_port[port].port_offset);
 251
 252                                 if (dest_brd->brd_type == KLTYPE_IP27)
 253                                         printk(" %d", dest_brd->brd_nasid);
 254                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
 255                                         printk(" r");
 256                         }
 257                         printk("\n");
 258
 259                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
 260         }
 261 }
 262
 263 static pfn_t __init slot_getbasepfn(cnodeid_t cnode, int slot)
 264 {
 265         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
 266
 267         return ((pfn_t)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
 268 }
 269
 270 /*
 271  * Return the number of pages of memory provided by the given slot
 272  * on the specified node.
 273  */
 274 static pfn_t __init slot_getsize(cnodeid_t node, int slot)
 275 {
 276         return (pfn_t) slot_psize_cache[node][slot];
 277 }
 278
 279 /*
 280  * Return highest slot filled
 281  */
 282 static int __init node_getlastslot(cnodeid_t node)
 283 {
 284         return (int) slot_lastfilled_cache[node];
 285 }
 286
 287 /*
 288  * Return the pfn of the last free page of memory on a node.
 289  */
 290 static pfn_t __init node_getmaxclick(cnodeid_t node)
 291 {
 292         pfn_t   slot_psize;
 293         int     slot;
 294
 295         /*
 296          * Start at the top slot. When we find a slot with memory in it,
 297          * that's the winner.
 298          */
 299         for (slot = (MAX_MEM_SLOTS - 1); slot >= 0; slot--) {
 300                 if ((slot_psize = slot_getsize(node, slot))) {
 301                         if (slot_psize == SLOT_IGNORED)
 302                                 continue;
 303                         /* Return the basepfn + the slot size, minus 1. */
 304                         return slot_getbasepfn(node, slot) + slot_psize - 1;
 305                 }
 306         }
 307
 308         /*
 309          * If there's no memory on the node, return 0. This is likely
 310          * to cause problems.
 311          */
 312         return 0;
 313 }
 314
 315 static pfn_t __init slot_psize_compute(cnodeid_t node, int slot)
 316 {
 317         nasid_t nasid;
 318         lboard_t *brd;
 319         klmembnk_t *banks;
 320         unsigned long size;
 321
 322         nasid = COMPACT_TO_NASID_NODEID(node);
 323         /* Find the node board */
 324         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
 325         if (!brd)
 326                 return 0;
 327
 328         /* Get the memory bank structure */
 329         banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
 330         if (!banks)
 331                 return 0;
 332
 333         /* Size in _Megabytes_ */
 334         size = (unsigned long)banks->membnk_bnksz[slot/4];
 335
 336         /* hack for 128 dimm banks */
 337         if (size <= 128) {
 338                 if (slot % 4 == 0) {
 339                         size <<= 20;            /* size in bytes */
 340                         return(size >> PAGE_SHIFT);
 341                 } else
 342                         return 0;
 343         } else {
 344                 size /= 4;
 345                 size <<= 20;
 346                 return size >> PAGE_SHIFT;
 347         }
 348 }
 349
 350 static void __init mlreset(void)
 351 {
 352         int i;
 353
 354         master_nasid = get_nasid();
 355         fine_mode = is_fine_dirmode();
 356
 357         /*
 358          * Probe for all CPUs - this creates the cpumask and sets up the
 359          * mapping tables.  We need to do this as early as possible.
 360          */
 361 #ifdef CONFIG_SMP
 362         cpu_node_probe();
 363 #endif
 364
 365         init_topology_matrix();
 366         dump_topology();
 367
 368         gen_region_mask(&region_mask);
 369
 370         setup_replication_mask();
 371
 372         /*
 373          * Set all nodes' calias sizes to 8k
 374          */
 375         for_each_online_node(i) {
 376                 nasid_t nasid;
 377
 378                 nasid = COMPACT_TO_NASID_NODEID(i);
 379
 380                 /*
 381                  * Always have node 0 in the region mask, otherwise
 382                  * CALIAS accesses get exceptions since the hub
 383                  * thinks it is a node 0 address.
 384                  */
 385                 REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
 386 #ifdef CONFIG_REPLICATE_EXHANDLERS
 387                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
 388 #else
 389                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
 390 #endif
 391
 392 #ifdef LATER
 393                 /*
 394                  * Set up all hubs to have a big window pointing at
 395                  * widget 0. Memory mode, widget 0, offset 0
 396                  */
 397                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
 398                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
 399                         (0 << IIO_ITTE_WIDGET_SHIFT)));
 400 #endif
 401         }
 402 }
 403
 404 static void __init szmem(void)
 405 {
 406         pfn_t slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
 407         int slot, ignore;
 408         cnodeid_t node;
 409
 410         num_physpages = 0;
 411
 412         for_each_online_node(node) {
 413                 ignore = nodebytes = 0;
 414                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
 415                         slot_psize = slot_psize_compute(node, slot);
 416                         if (slot == 0)
 417                                 slot0sz = slot_psize;
 418                         /*
 419                          * We need to refine the hack when we have replicated
 420                          * kernel text.
 421                          */
 422                         nodebytes += (1LL << SLOT_SHIFT);
 423                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
 424                                                 (slot0sz << PAGE_SHIFT))
 425                                 ignore = 1;
 426                         if (ignore && slot_psize) {
 427                                 printk("Ignoring slot %d onwards on node %d\n",
 428                                                                 slot, node);
 429                                 slot_psize_cache[node][slot] = SLOT_IGNORED;
 430                                 slot = MAX_MEM_SLOTS;
 431                                 continue;
 432                         }
 433                         num_physpages += slot_psize;
 434                         slot_psize_cache[node][slot] =
 435                                         (unsigned short) slot_psize;
 436                         if (slot_psize)
 437                                 slot_lastfilled_cache[node] = slot;
 438                 }
 439         }
 440 }
 441
 442 static void __init node_mem_init(cnodeid_t node)
 443 {
 444         pfn_t slot_firstpfn = slot_getbasepfn(node, 0);
 445         pfn_t slot_lastpfn = slot_firstpfn + slot_getsize(node, 0);
 446         pfn_t slot_freepfn = node_getfirstfree(node);
 447         struct pglist_data *pd;
 448         unsigned long bootmap_size;
 449
 450         /*
 451          * Allocate the node data structures on the node first.
 452          */
 453         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 454
 455         pd = NODE_DATA(node);
 456         pd->bdata = &plat_node_bdata[node];
 457
 458         cpus_clear(hub_data(node)->h_cpus);
 459
 460         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
 461                                sizeof(struct hub_data));
 462
 463         bootmap_size = init_bootmem_node(NODE_DATA(node), slot_freepfn,
 464                                         slot_firstpfn, slot_lastpfn);
 465         free_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
 466                         (slot_lastpfn - slot_firstpfn) << PAGE_SHIFT);
 467         reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
 468                 ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size,
 469                 BOOTMEM_DEFAULT);
 470 }
 471
 472 /*
 473  * A node with nothing.  We use it to avoid any special casing in
 474  * node_to_cpumask
 475  */
 476 static struct node_data null_node = {
 477         .hub = {
 478                 .h_cpus = CPU_MASK_NONE
 479         }
 480 };
 481
 482 /*
 483  * Currently, the intranode memory hole support assumes that each slot
 484  * contains at least 32 MBytes of memory. We assume all bootmem data
 485  * fits on the first slot.
 486  */
 487 void __init prom_meminit(void)
 488 {
 489         cnodeid_t node;
 490
 491         mlreset();
 492         szmem();
 493
 494         for (node = 0; node < MAX_COMPACT_NODES; node++) {
 495                 if (node_online(node)) {
 496                         node_mem_init(node);
 497                         continue;
 498                 }
 499                 __node_data[node] = &null_node;
 500         }
 501 }
 502
 503 void __init prom_free_prom_memory(void)
 504 {
 505         /* We got nothing to free here ...  */
 506 }
 507
 508 extern unsigned long setup_zero_pages(void);
 509
 510 void __init paging_init(void)
 511 {
 512         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 513         unsigned node;
 514
 515         pagetable_init();
 516
 517         for_each_online_node(node) {
 518                 pfn_t start_pfn = slot_getbasepfn(node, 0);
 519                 pfn_t end_pfn = node_getmaxclick(node) + 1;
 520
 521                 zones_size[ZONE_NORMAL] = end_pfn - start_pfn;
 522                 free_area_init_node(node, NODE_DATA(node),
 523                                 zones_size, start_pfn, NULL);
 524
 525                 if (end_pfn > max_low_pfn)
 526                         max_low_pfn = end_pfn;
 527         }
 528 }
 529
 530 void __init mem_init(void)
 531 {
 532         unsigned long codesize, datasize, initsize, tmp;
 533         unsigned node;
 534
 535         high_memory = (void *) __va(num_physpages << PAGE_SHIFT);
 536
 537         for_each_online_node(node) {
 538                 unsigned slot, numslots;
 539                 struct page *end, *p;
 540
 541                 /*
 542                  * This will free up the bootmem, ie, slot 0 memory.
 543                  */
 544                 totalram_pages += free_all_bootmem_node(NODE_DATA(node));
 545
 546                 /*
 547                  * We need to manually do the other slots.
 548                  */
 549                 numslots = node_getlastslot(node);
 550                 for (slot = 1; slot <= numslots; slot++) {
 551                         p = nid_page_nr(node, slot_getbasepfn(node, slot) -
 552                                               slot_getbasepfn(node, 0));
 553
 554                         /*
 555                          * Free valid memory in current slot.
 556                          */
 557                         for (end = p + slot_getsize(node, slot); p < end; p++) {
 558                                 /* if (!page_is_ram(pgnr)) continue; */
 559                                 /* commented out until page_is_ram works */
 560                                 ClearPageReserved(p);
 561                                 init_page_count(p);
 562                                 __free_page(p);
 563                                 totalram_pages++;
 564                         }
 565                 }
 566         }
 567
 568         totalram_pages -= setup_zero_pages();   /* This comes from node 0 */
 569
 570         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 571         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 572         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 573
 574         tmp = nr_free_pages();
 575         printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 576                "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
 577                tmp << (PAGE_SHIFT-10),
 578                num_physpages << (PAGE_SHIFT-10),
 579                codesize >> 10,
 580                (num_physpages - tmp) << (PAGE_SHIFT-10),
 581                datasize >> 10,
 582                initsize >> 10,
 583                (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
 584 }