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 completely 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/export.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) >> 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 EXPORT_SYMBOL(__node_distances);
 110
 111 static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
 112 {
 113         klrou_t *router, *router_a = NULL, *router_b = NULL;
 114         lboard_t *brd, *dest_brd;
 115         cnodeid_t cnode;
 116         nasid_t nasid;
 117         int port;
 118
 119         /* Figure out which routers nodes in question are connected to */
 120         for_each_online_node(cnode) {
 121                 nasid = COMPACT_TO_NASID_NODEID(cnode);
 122
 123                 if (nasid == -1) continue;
 124
 125                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 126                                         KLTYPE_ROUTER);
 127
 128                 if (!brd)
 129                         continue;
 130
 131                 do {
 132                         if (brd->brd_flags & DUPLICATE_BOARD)
 133                                 continue;
 134
 135                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 136                         router->rou_rflag = 0;
 137
 138                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 139                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 140                                         continue;
 141
 142                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 143                                         router->rou_port[port].port_nasid,
 144                                         router->rou_port[port].port_offset);
 145
 146                                 if (dest_brd->brd_type == KLTYPE_IP27) {
 147                                         if (dest_brd->brd_nasid == nasid_a)
 148                                                 router_a = router;
 149                                         if (dest_brd->brd_nasid == nasid_b)
 150                                                 router_b = router;
 151                                 }
 152                         }
 153
 154                 } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
 155         }
 156
 157         if (router_a == NULL) {
 158                 printk("node_distance: router_a NULL\n");
 159                 return -1;
 160         }
 161         if (router_b == NULL) {
 162                 printk("node_distance: router_b NULL\n");
 163                 return -1;
 164         }
 165
 166         if (nasid_a == nasid_b)
 167                 return 0;
 168
 169         if (router_a == router_b)
 170                 return 1;
 171
 172         router_distance = 100;
 173         router_recurse(router_a, router_b, 2);
 174
 175         return router_distance;
 176 }
 177
 178 static void __init init_topology_matrix(void)
 179 {
 180         nasid_t nasid, nasid2;
 181         cnodeid_t row, col;
 182
 183         for (row = 0; row < MAX_COMPACT_NODES; row++)
 184                 for (col = 0; col < MAX_COMPACT_NODES; col++)
 185                         __node_distances[row][col] = -1;
 186
 187         for_each_online_node(row) {
 188                 nasid = COMPACT_TO_NASID_NODEID(row);
 189                 for_each_online_node(col) {
 190                         nasid2 = COMPACT_TO_NASID_NODEID(col);
 191                         __node_distances[row][col] =
 192                                 compute_node_distance(nasid, nasid2);
 193                 }
 194         }
 195 }
 196
 197 static void __init dump_topology(void)
 198 {
 199         nasid_t nasid;
 200         cnodeid_t cnode;
 201         lboard_t *brd, *dest_brd;
 202         int port;
 203         int router_num = 0;
 204         klrou_t *router;
 205         cnodeid_t row, col;
 206
 207         printk("************** Topology ********************\n");
 208
 209         printk("    ");
 210         for_each_online_node(col)
 211                 printk("%02d ", col);
 212         printk("\n");
 213         for_each_online_node(row) {
 214                 printk("%02d  ", row);
 215                 for_each_online_node(col)
 216                         printk("%2d ", node_distance(row, col));
 217                 printk("\n");
 218         }
 219
 220         for_each_online_node(cnode) {
 221                 nasid = COMPACT_TO_NASID_NODEID(cnode);
 222
 223                 if (nasid == -1) continue;
 224
 225                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 226                                         KLTYPE_ROUTER);
 227
 228                 if (!brd)
 229                         continue;
 230
 231                 do {
 232                         if (brd->brd_flags & DUPLICATE_BOARD)
 233                                 continue;
 234                         printk("Router %d:", router_num);
 235                         router_num++;
 236
 237                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 238
 239                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 240                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 241                                         continue;
 242
 243                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 244                                         router->rou_port[port].port_nasid,
 245                                         router->rou_port[port].port_offset);
 246
 247                                 if (dest_brd->brd_type == KLTYPE_IP27)
 248                                         printk(" %d", dest_brd->brd_nasid);
 249                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
 250                                         printk(" r");
 251                         }
 252                         printk("\n");
 253
 254                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
 255         }
 256 }
 257
 258 static unsigned long __init slot_getbasepfn(cnodeid_t cnode, int slot)
 259 {
 260         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
 261
 262         return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
 263 }
 264
 265 static unsigned long __init slot_psize_compute(cnodeid_t node, int slot)
 266 {
 267         nasid_t nasid;
 268         lboard_t *brd;
 269         klmembnk_t *banks;
 270         unsigned long size;
 271
 272         nasid = COMPACT_TO_NASID_NODEID(node);
 273         /* Find the node board */
 274         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
 275         if (!brd)
 276                 return 0;
 277
 278         /* Get the memory bank structure */
 279         banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
 280         if (!banks)
 281                 return 0;
 282
 283         /* Size in _Megabytes_ */
 284         size = (unsigned long)banks->membnk_bnksz[slot/4];
 285
 286         /* hack for 128 dimm banks */
 287         if (size <= 128) {
 288                 if (slot % 4 == 0) {
 289                         size <<= 20;            /* size in bytes */
 290                         return size >> PAGE_SHIFT;
 291                 } else
 292                         return 0;
 293         } else {
 294                 size /= 4;
 295                 size <<= 20;
 296                 return size >> PAGE_SHIFT;
 297         }
 298 }
 299
 300 static void __init mlreset(void)
 301 {
 302         int i;
 303
 304         master_nasid = get_nasid();
 305         fine_mode = is_fine_dirmode();
 306
 307         /*
 308          * Probe for all CPUs - this creates the cpumask and sets up the
 309          * mapping tables.  We need to do this as early as possible.
 310          */
 311 #ifdef CONFIG_SMP
 312         cpu_node_probe();
 313 #endif
 314
 315         init_topology_matrix();
 316         dump_topology();
 317
 318         gen_region_mask(&region_mask);
 319
 320         setup_replication_mask();
 321
 322         /*
 323          * Set all nodes' calias sizes to 8k
 324          */
 325         for_each_online_node(i) {
 326                 nasid_t nasid;
 327
 328                 nasid = COMPACT_TO_NASID_NODEID(i);
 329
 330                 /*
 331                  * Always have node 0 in the region mask, otherwise
 332                  * CALIAS accesses get exceptions since the hub
 333                  * thinks it is a node 0 address.
 334                  */
 335                 REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
 336 #ifdef CONFIG_REPLICATE_EXHANDLERS
 337                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
 338 #else
 339                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
 340 #endif
 341
 342 #ifdef LATER
 343                 /*
 344                  * Set up all hubs to have a big window pointing at
 345                  * widget 0. Memory mode, widget 0, offset 0
 346                  */
 347                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
 348                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
 349                         (0 << IIO_ITTE_WIDGET_SHIFT)));
 350 #endif
 351         }
 352 }
 353
 354 static void __init szmem(void)
 355 {
 356         unsigned long slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
 357         int slot;
 358         cnodeid_t node;
 359
 360         for_each_online_node(node) {
 361                 nodebytes = 0;
 362                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
 363                         slot_psize = slot_psize_compute(node, slot);
 364                         if (slot == 0)
 365                                 slot0sz = slot_psize;
 366                         /*
 367                          * We need to refine the hack when we have replicated
 368                          * kernel text.
 369                          */
 370                         nodebytes += (1LL << SLOT_SHIFT);
 371
 372                         if (!slot_psize)
 373                                 continue;
 374
 375                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
 376                                                 (slot0sz << PAGE_SHIFT)) {
 377                                 printk("Ignoring slot %d onwards on node %d\n",
 378                                                                 slot, node);
 379                                 slot = MAX_MEM_SLOTS;
 380                                 continue;
 381                         }
 382                         memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
 383                                           PFN_PHYS(slot_psize), node);
 384                 }
 385         }
 386 }
 387
 388 static void __init node_mem_init(cnodeid_t node)
 389 {
 390         unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
 391         unsigned long slot_freepfn = node_getfirstfree(node);
 392         unsigned long bootmap_size;
 393         unsigned long start_pfn, end_pfn;
 394
 395         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 396
 397         /*
 398          * Allocate the node data structures on the node first.
 399          */
 400         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 401         memset(__node_data[node], 0, PAGE_SIZE);
 402
 403         NODE_DATA(node)->bdata = &bootmem_node_data[node];
 404         NODE_DATA(node)->node_start_pfn = start_pfn;
 405         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
 406
 407         cpumask_clear(&hub_data(node)->h_cpus);
 408
 409         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
 410                                sizeof(struct hub_data));
 411
 412         bootmap_size = init_bootmem_node(NODE_DATA(node), slot_freepfn,
 413                                         start_pfn, end_pfn);
 414         free_bootmem_with_active_regions(node, end_pfn);
 415         reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
 416                 ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size,
 417                 BOOTMEM_DEFAULT);
 418         sparse_memory_present_with_active_regions(node);
 419 }
 420
 421 /*
 422  * A node with nothing.  We use it to avoid any special casing in
 423  * cpumask_of_node
 424  */
 425 static struct node_data null_node = {
 426         .hub = {
 427                 .h_cpus = CPU_MASK_NONE
 428         }
 429 };
 430
 431 /*
 432  * Currently, the intranode memory hole support assumes that each slot
 433  * contains at least 32 MBytes of memory. We assume all bootmem data
 434  * fits on the first slot.
 435  */
 436 void __init prom_meminit(void)
 437 {
 438         cnodeid_t node;
 439
 440         mlreset();
 441         szmem();
 442
 443         for (node = 0; node < MAX_COMPACT_NODES; node++) {
 444                 if (node_online(node)) {
 445                         node_mem_init(node);
 446                         continue;
 447                 }
 448                 __node_data[node] = &null_node;
 449         }
 450 }
 451
 452 void __init prom_free_prom_memory(void)
 453 {
 454         /* We got nothing to free here ...  */
 455 }
 456
 457 extern void setup_zero_pages(void);
 458
 459 void __init paging_init(void)
 460 {
 461         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 462         unsigned node;
 463
 464         pagetable_init();
 465
 466         for_each_online_node(node) {
 467                 unsigned long start_pfn, end_pfn;
 468
 469                 get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 470
 471                 if (end_pfn > max_low_pfn)
 472                         max_low_pfn = end_pfn;
 473         }
 474         zones_size[ZONE_NORMAL] = max_low_pfn;
 475         free_area_init_nodes(zones_size);
 476 }
 477
 478 void __init mem_init(void)
 479 {
 480         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 481         free_all_bootmem();
 482         setup_zero_pages();     /* This comes from node 0 */
 483         mem_init_print_info(NULL);
 484 }