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/memblock.h>
  16 #include <linux/mm.h>
  17 #include <linux/mmzone.h>
  18 #include <linux/module.h>
  19 #include <linux/nodemask.h>
  20 #include <linux/swap.h>
  21 #include <linux/bootmem.h>
  22 #include <linux/pfn.h>
  23 #include <linux/highmem.h>
  24 #include <asm/page.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/sections.h>
  27
  28 #include <asm/sn/arch.h>
  29 #include <asm/sn/hub.h>
  30 #include <asm/sn/klconfig.h>
  31 #include <asm/sn/sn_private.h>
  32
  33
  34 #define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
  35 #define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)
  36
  37 struct node_data *__node_data[MAX_COMPACT_NODES];
  38
  39 EXPORT_SYMBOL(__node_data);
  40
  41 static int fine_mode;
  42
  43 static int is_fine_dirmode(void)
  44 {
  45         return (((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_REGIONSIZE_MASK)
  46                 >> NSRI_REGIONSIZE_SHFT) & REGIONSIZE_FINE);
  47 }
  48
  49 static hubreg_t get_region(cnodeid_t cnode)
  50 {
  51         if (fine_mode)
  52                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_FINEREG_SHFT;
  53         else
  54                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_COARSEREG_SHFT;
  55 }
  56
  57 static hubreg_t region_mask;
  58
  59 static void gen_region_mask(hubreg_t *region_mask)
  60 {
  61         cnodeid_t cnode;
  62
  63         (*region_mask) = 0;
  64         for_each_online_node(cnode) {
  65                 (*region_mask) |= 1ULL << get_region(cnode);
  66         }
  67 }
  68
  69 #define rou_rflag       rou_flags
  70
  71 static int router_distance;
  72
  73 static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
  74 {
  75         klrou_t *router;
  76         lboard_t *brd;
  77         int     port;
  78
  79         if (router_a->rou_rflag == 1)
  80                 return;
  81
  82         if (depth >= router_distance)
  83                 return;
  84
  85         router_a->rou_rflag = 1;
  86
  87         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
  88                 if (router_a->rou_port[port].port_nasid == INVALID_NASID)
  89                         continue;
  90
  91                 brd = (lboard_t *)NODE_OFFSET_TO_K0(
  92                         router_a->rou_port[port].port_nasid,
  93                         router_a->rou_port[port].port_offset);
  94
  95                 if (brd->brd_type == KLTYPE_ROUTER) {
  96                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
  97                         if (router == router_b) {
  98                                 if (depth < router_distance)
  99                                         router_distance = depth;
 100                         }
 101                         else
 102                                 router_recurse(router, router_b, depth + 1);
 103                 }
 104         }
 105
 106         router_a->rou_rflag = 0;
 107 }
 108
 109 unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
 110 EXPORT_SYMBOL(__node_distances);
 111
 112 static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
 113 {
 114         klrou_t *router, *router_a = NULL, *router_b = NULL;
 115         lboard_t *brd, *dest_brd;
 116         cnodeid_t cnode;
 117         nasid_t nasid;
 118         int port;
 119
 120         /* Figure out which routers nodes in question are connected to */
 121         for_each_online_node(cnode) {
 122                 nasid = COMPACT_TO_NASID_NODEID(cnode);
 123
 124                 if (nasid == -1) continue;
 125
 126                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 127                                         KLTYPE_ROUTER);
 128
 129                 if (!brd)
 130                         continue;
 131
 132                 do {
 133                         if (brd->brd_flags & DUPLICATE_BOARD)
 134                                 continue;
 135
 136                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 137                         router->rou_rflag = 0;
 138
 139                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 140                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 141                                         continue;
 142
 143                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 144                                         router->rou_port[port].port_nasid,
 145                                         router->rou_port[port].port_offset);
 146
 147                                 if (dest_brd->brd_type == KLTYPE_IP27) {
 148                                         if (dest_brd->brd_nasid == nasid_a)
 149                                                 router_a = router;
 150                                         if (dest_brd->brd_nasid == nasid_b)
 151                                                 router_b = router;
 152                                 }
 153                         }
 154
 155                 } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
 156         }
 157
 158         if (router_a == NULL) {
 159                 printk("node_distance: router_a NULL\n");
 160                 return -1;
 161         }
 162         if (router_b == NULL) {
 163                 printk("node_distance: router_b NULL\n");
 164                 return -1;
 165         }
 166
 167         if (nasid_a == nasid_b)
 168                 return 0;
 169
 170         if (router_a == router_b)
 171                 return 1;
 172
 173         router_distance = 100;
 174         router_recurse(router_a, router_b, 2);
 175
 176         return router_distance;
 177 }
 178
 179 static void __init init_topology_matrix(void)
 180 {
 181         nasid_t nasid, nasid2;
 182         cnodeid_t row, col;
 183
 184         for (row = 0; row < MAX_COMPACT_NODES; row++)
 185                 for (col = 0; col < MAX_COMPACT_NODES; col++)
 186                         __node_distances[row][col] = -1;
 187
 188         for_each_online_node(row) {
 189                 nasid = COMPACT_TO_NASID_NODEID(row);
 190                 for_each_online_node(col) {
 191                         nasid2 = COMPACT_TO_NASID_NODEID(col);
 192                         __node_distances[row][col] =
 193                                 compute_node_distance(nasid, nasid2);
 194                 }
 195         }
 196 }
 197
 198 static void __init dump_topology(void)
 199 {
 200         nasid_t nasid;
 201         cnodeid_t cnode;
 202         lboard_t *brd, *dest_brd;
 203         int port;
 204         int router_num = 0;
 205         klrou_t *router;
 206         cnodeid_t row, col;
 207
 208         printk("************** Topology ********************\n");
 209
 210         printk("    ");
 211         for_each_online_node(col)
 212                 printk("%02d ", col);
 213         printk("\n");
 214         for_each_online_node(row) {
 215                 printk("%02d  ", row);
 216                 for_each_online_node(col)
 217                         printk("%2d ", node_distance(row, col));
 218                 printk("\n");
 219         }
 220
 221         for_each_online_node(cnode) {
 222                 nasid = COMPACT_TO_NASID_NODEID(cnode);
 223
 224                 if (nasid == -1) continue;
 225
 226                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 227                                         KLTYPE_ROUTER);
 228
 229                 if (!brd)
 230                         continue;
 231
 232                 do {
 233                         if (brd->brd_flags & DUPLICATE_BOARD)
 234                                 continue;
 235                         printk("Router %d:", router_num);
 236                         router_num++;
 237
 238                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 239
 240                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 241                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 242                                         continue;
 243
 244                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 245                                         router->rou_port[port].port_nasid,
 246                                         router->rou_port[port].port_offset);
 247
 248                                 if (dest_brd->brd_type == KLTYPE_IP27)
 249                                         printk(" %d", dest_brd->brd_nasid);
 250                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
 251                                         printk(" r");
 252                         }
 253                         printk("\n");
 254
 255                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
 256         }
 257 }
 258
 259 static unsigned long __init slot_getbasepfn(cnodeid_t cnode, int slot)
 260 {
 261         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
 262
 263         return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
 264 }
 265
 266 static unsigned long __init slot_psize_compute(cnodeid_t node, int slot)
 267 {
 268         nasid_t nasid;
 269         lboard_t *brd;
 270         klmembnk_t *banks;
 271         unsigned long size;
 272
 273         nasid = COMPACT_TO_NASID_NODEID(node);
 274         /* Find the node board */
 275         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
 276         if (!brd)
 277                 return 0;
 278
 279         /* Get the memory bank structure */
 280         banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
 281         if (!banks)
 282                 return 0;
 283
 284         /* Size in _Megabytes_ */
 285         size = (unsigned long)banks->membnk_bnksz[slot/4];
 286
 287         /* hack for 128 dimm banks */
 288         if (size <= 128) {
 289                 if (slot % 4 == 0) {
 290                         size <<= 20;            /* size in bytes */
 291                         return(size >> PAGE_SHIFT);
 292                 } else
 293                         return 0;
 294         } else {
 295                 size /= 4;
 296                 size <<= 20;
 297                 return size >> PAGE_SHIFT;
 298         }
 299 }
 300
 301 static void __init mlreset(void)
 302 {
 303         int i;
 304
 305         master_nasid = get_nasid();
 306         fine_mode = is_fine_dirmode();
 307
 308         /*
 309          * Probe for all CPUs - this creates the cpumask and sets up the
 310          * mapping tables.  We need to do this as early as possible.
 311          */
 312 #ifdef CONFIG_SMP
 313         cpu_node_probe();
 314 #endif
 315
 316         init_topology_matrix();
 317         dump_topology();
 318
 319         gen_region_mask(&region_mask);
 320
 321         setup_replication_mask();
 322
 323         /*
 324          * Set all nodes' calias sizes to 8k
 325          */
 326         for_each_online_node(i) {
 327                 nasid_t nasid;
 328
 329                 nasid = COMPACT_TO_NASID_NODEID(i);
 330
 331                 /*
 332                  * Always have node 0 in the region mask, otherwise
 333                  * CALIAS accesses get exceptions since the hub
 334                  * thinks it is a node 0 address.
 335                  */
 336                 REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
 337 #ifdef CONFIG_REPLICATE_EXHANDLERS
 338                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
 339 #else
 340                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
 341 #endif
 342
 343 #ifdef LATER
 344                 /*
 345                  * Set up all hubs to have a big window pointing at
 346                  * widget 0. Memory mode, widget 0, offset 0
 347                  */
 348                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
 349                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
 350                         (0 << IIO_ITTE_WIDGET_SHIFT)));
 351 #endif
 352         }
 353 }
 354
 355 static void __init szmem(void)
 356 {
 357         unsigned long slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
 358         int slot;
 359         cnodeid_t node;
 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                         memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
 384                                           PFN_PHYS(slot_psize), node);
 385                 }
 386         }
 387 }
 388
 389 static void __init node_mem_init(cnodeid_t node)
 390 {
 391         unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
 392         unsigned long slot_freepfn = node_getfirstfree(node);
 393         unsigned long bootmap_size;
 394         unsigned long start_pfn, end_pfn;
 395
 396         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 397
 398         /*
 399          * Allocate the node data structures on the node first.
 400          */
 401         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 402         memset(__node_data[node], 0, PAGE_SIZE);
 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 void 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                 unsigned long 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         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 482         free_all_bootmem();
 483         setup_zero_pages();     /* This comes from node 0 */
 484         mem_init_print_info(NULL);
 485 }