linux/arch/mips/sgi-ip27/ip27-memory.c
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   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
  37struct node_data *__node_data[MAX_COMPACT_NODES];
  38
  39EXPORT_SYMBOL(__node_data);
  40
  41static int fine_mode;
  42
  43static 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
  48static 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
  56static hubreg_t region_mask;
  57
  58static 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
  70static int router_distance;
  71
  72static 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
 108unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
 109EXPORT_SYMBOL(__node_distances);
 110
 111static 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
 178static 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
 197static 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
 258static 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
 265static 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
 300static 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
 354static 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
 388static 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 */
 425static 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 */
 436void __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
 452void __init prom_free_prom_memory(void)
 453{
 454        /* We got nothing to free here ...  */
 455}
 456
 457extern void setup_zero_pages(void);
 458
 459void __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
 478void __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}
 485