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/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) >> NSRI_REGIONSIZE_SHFT) & REGIONSIZE_FINE;
  45 }
  46
  47 static u64 get_region(cnodeid_t cnode)
  48 {
  49         if (fine_mode)
  50                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_FINEREG_SHFT;
  51         else
  52                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_COARSEREG_SHFT;
  53 }
  54
  55 static u64 region_mask;
  56
  57 static void gen_region_mask(u64 *region_mask)
  58 {
  59         cnodeid_t cnode;
  60
  61         (*region_mask) = 0;
  62         for_each_online_node(cnode) {
  63                 (*region_mask) |= 1ULL << get_region(cnode);
  64         }
  65 }
  66
  67 #define rou_rflag       rou_flags
  68
  69 static int router_distance;
  70
  71 static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
  72 {
  73         klrou_t *router;
  74         lboard_t *brd;
  75         int     port;
  76
  77         if (router_a->rou_rflag == 1)
  78                 return;
  79
  80         if (depth >= router_distance)
  81                 return;
  82
  83         router_a->rou_rflag = 1;
  84
  85         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
  86                 if (router_a->rou_port[port].port_nasid == INVALID_NASID)
  87                         continue;
  88
  89                 brd = (lboard_t *)NODE_OFFSET_TO_K0(
  90                         router_a->rou_port[port].port_nasid,
  91                         router_a->rou_port[port].port_offset);
  92
  93                 if (brd->brd_type == KLTYPE_ROUTER) {
  94                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
  95                         if (router == router_b) {
  96                                 if (depth < router_distance)
  97                                         router_distance = depth;
  98                         }
  99                         else
 100                                 router_recurse(router, router_b, depth + 1);
 101                 }
 102         }
 103
 104         router_a->rou_rflag = 0;
 105 }
 106
 107 unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
 108 EXPORT_SYMBOL(__node_distances);
 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                 pr_info("node_distance: router_a NULL\n");
 158                 return -1;
 159         }
 160         if (router_b == NULL) {
 161                 pr_info("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         pr_info("************** Topology ********************\n");
 207
 208         pr_info("    ");
 209         for_each_online_node(col)
 210                 pr_cont("%02d ", col);
 211         pr_cont("\n");
 212         for_each_online_node(row) {
 213                 pr_info("%02d  ", row);
 214                 for_each_online_node(col)
 215                         pr_cont("%2d ", node_distance(row, col));
 216                 pr_cont("\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                         pr_cont("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                                         pr_cont(" %d", dest_brd->brd_nasid);
 248                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
 249                                         pr_cont(" r");
 250                         }
 251                         pr_cont("\n");
 252
 253                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
 254         }
 255 }
 256
 257 static unsigned long __init slot_getbasepfn(cnodeid_t cnode, int slot)
 258 {
 259         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
 260
 261         return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
 262 }
 263
 264 static unsigned long __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         unsigned long slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
 356         int slot;
 357         cnodeid_t node;
 358
 359         for_each_online_node(node) {
 360                 nodebytes = 0;
 361                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
 362                         slot_psize = slot_psize_compute(node, slot);
 363                         if (slot == 0)
 364                                 slot0sz = slot_psize;
 365                         /*
 366                          * We need to refine the hack when we have replicated
 367                          * kernel text.
 368                          */
 369                         nodebytes += (1LL << SLOT_SHIFT);
 370
 371                         if (!slot_psize)
 372                                 continue;
 373
 374                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
 375                                                 (slot0sz << PAGE_SHIFT)) {
 376                                 pr_info("Ignoring slot %d onwards on node %d\n",
 377                                                                 slot, node);
 378                                 slot = MAX_MEM_SLOTS;
 379                                 continue;
 380                         }
 381                         memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
 382                                           PFN_PHYS(slot_psize), node);
 383                 }
 384         }
 385 }
 386
 387 static void __init node_mem_init(cnodeid_t node)
 388 {
 389         unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
 390         unsigned long slot_freepfn = node_getfirstfree(node);
 391         unsigned long start_pfn, end_pfn;
 392
 393         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 394
 395         /*
 396          * Allocate the node data structures on the node first.
 397          */
 398         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 399         memset(__node_data[node], 0, PAGE_SIZE);
 400
 401         NODE_DATA(node)->node_start_pfn = start_pfn;
 402         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
 403
 404         cpumask_clear(&hub_data(node)->h_cpus);
 405
 406         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
 407                                sizeof(struct hub_data));
 408
 409         free_bootmem_with_active_regions(node, end_pfn);
 410
 411         memblock_reserve(slot_firstpfn << PAGE_SHIFT,
 412                          ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT));
 413
 414         sparse_memory_present_with_active_regions(node);
 415 }
 416
 417 /*
 418  * A node with nothing.  We use it to avoid any special casing in
 419  * cpumask_of_node
 420  */
 421 static struct node_data null_node = {
 422         .hub = {
 423                 .h_cpus = CPU_MASK_NONE
 424         }
 425 };
 426
 427 /*
 428  * Currently, the intranode memory hole support assumes that each slot
 429  * contains at least 32 MBytes of memory. We assume all bootmem data
 430  * fits on the first slot.
 431  */
 432 void __init prom_meminit(void)
 433 {
 434         cnodeid_t node;
 435
 436         mlreset();
 437         szmem();
 438         max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
 439
 440         for (node = 0; node < MAX_COMPACT_NODES; node++) {
 441                 if (node_online(node)) {
 442                         node_mem_init(node);
 443                         continue;
 444                 }
 445                 __node_data[node] = &null_node;
 446         }
 447 }
 448
 449 void __init prom_free_prom_memory(void)
 450 {
 451         /* We got nothing to free here ...  */
 452 }
 453
 454 extern void setup_zero_pages(void);
 455
 456 void __init paging_init(void)
 457 {
 458         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 459
 460         pagetable_init();
 461         zones_size[ZONE_NORMAL] = max_low_pfn;
 462         free_area_init_nodes(zones_size);
 463 }
 464
 465 void __init mem_init(void)
 466 {
 467         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 468         memblock_free_all();
 469         setup_zero_pages();     /* This comes from node 0 */
 470         mem_init_print_info(NULL);
 471 }