LXR linux/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/agent.h>
  29#include <asm/sn/klconfig.h>
  30
  31#include "ip27-common.h"
  32
  33#define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
  34#define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)
  35
  36struct node_data *__node_data[MAX_NUMNODES];
  37
  38EXPORT_SYMBOL(__node_data);
  39
  40static u64 gen_region_mask(void)
  41{
  42        int region_shift;
  43        u64 region_mask;
  44        nasid_t nasid;
  45
  46        region_shift = get_region_shift();
  47        region_mask = 0;
  48        for_each_online_node(nasid)
  49                region_mask |= BIT_ULL(nasid >> region_shift);
  50
  51        return region_mask;
  52}
  53
  54#define rou_rflag       rou_flags
  55
  56static int router_distance;
  57
  58static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
  59{
  60        klrou_t *router;
  61        lboard_t *brd;
  62        int     port;
  63
  64        if (router_a->rou_rflag == 1)
  65                return;
  66
  67        if (depth >= router_distance)
  68                return;
  69
  70        router_a->rou_rflag = 1;
  71
  72        for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
  73                if (router_a->rou_port[port].port_nasid == INVALID_NASID)
  74                        continue;
  75
  76                brd = (lboard_t *)NODE_OFFSET_TO_K0(
  77                        router_a->rou_port[port].port_nasid,
  78                        router_a->rou_port[port].port_offset);
  79
  80                if (brd->brd_type == KLTYPE_ROUTER) {
  81                        router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
  82                        if (router == router_b) {
  83                                if (depth < router_distance)
  84                                        router_distance = depth;
  85                        }
  86                        else
  87                                router_recurse(router, router_b, depth + 1);
  88                }
  89        }
  90
  91        router_a->rou_rflag = 0;
  92}
  93
  94unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
  95EXPORT_SYMBOL(__node_distances);
  96
  97static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
  98{
  99        klrou_t *router, *router_a = NULL, *router_b = NULL;
 100        lboard_t *brd, *dest_brd;
 101        nasid_t nasid;
 102        int port;
 103
 104        /* Figure out which routers nodes in question are connected to */
 105        for_each_online_node(nasid) {
 106                brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 107                                        KLTYPE_ROUTER);
 108
 109                if (!brd)
 110                        continue;
 111
 112                do {
 113                        if (brd->brd_flags & DUPLICATE_BOARD)
 114                                continue;
 115
 116                        router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 117                        router->rou_rflag = 0;
 118
 119                        for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 120                                if (router->rou_port[port].port_nasid == INVALID_NASID)
 121                                        continue;
 122
 123                                dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 124                                        router->rou_port[port].port_nasid,
 125                                        router->rou_port[port].port_offset);
 126
 127                                if (dest_brd->brd_type == KLTYPE_IP27) {
 128                                        if (dest_brd->brd_nasid == nasid_a)
 129                                                router_a = router;
 130                                        if (dest_brd->brd_nasid == nasid_b)
 131                                                router_b = router;
 132                                }
 133                        }
 134
 135                } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
 136        }
 137
 138        if (nasid_a == nasid_b)
 139                return LOCAL_DISTANCE;
 140
 141        if (router_a == router_b)
 142                return LOCAL_DISTANCE + 1;
 143
 144        if (router_a == NULL) {
 145                pr_info("node_distance: router_a NULL\n");
 146                return 255;
 147        }
 148        if (router_b == NULL) {
 149                pr_info("node_distance: router_b NULL\n");
 150                return 255;
 151        }
 152
 153        router_distance = 100;
 154        router_recurse(router_a, router_b, 2);
 155
 156        return LOCAL_DISTANCE + router_distance;
 157}
 158
 159static void __init init_topology_matrix(void)
 160{
 161        nasid_t row, col;
 162
 163        for (row = 0; row < MAX_NUMNODES; row++)
 164                for (col = 0; col < MAX_NUMNODES; col++)
 165                        __node_distances[row][col] = -1;
 166
 167        for_each_online_node(row) {
 168                for_each_online_node(col) {
 169                        __node_distances[row][col] =
 170                                compute_node_distance(row, col);
 171                }
 172        }
 173}
 174
 175static void __init dump_topology(void)
 176{
 177        nasid_t nasid;
 178        lboard_t *brd, *dest_brd;
 179        int port;
 180        int router_num = 0;
 181        klrou_t *router;
 182        nasid_t row, col;
 183
 184        pr_info("************** Topology ********************\n");
 185
 186        pr_info("    ");
 187        for_each_online_node(col)
 188                pr_cont("%02d ", col);
 189        pr_cont("\n");
 190        for_each_online_node(row) {
 191                pr_info("%02d  ", row);
 192                for_each_online_node(col)
 193                        pr_cont("%2d ", node_distance(row, col));
 194                pr_cont("\n");
 195        }
 196
 197        for_each_online_node(nasid) {
 198                brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 199                                        KLTYPE_ROUTER);
 200
 201                if (!brd)
 202                        continue;
 203
 204                do {
 205                        if (brd->brd_flags & DUPLICATE_BOARD)
 206                                continue;
 207                        pr_cont("Router %d:", router_num);
 208                        router_num++;
 209
 210                        router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 211
 212                        for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 213                                if (router->rou_port[port].port_nasid == INVALID_NASID)
 214                                        continue;
 215
 216                                dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 217                                        router->rou_port[port].port_nasid,
 218                                        router->rou_port[port].port_offset);
 219
 220                                if (dest_brd->brd_type == KLTYPE_IP27)
 221                                        pr_cont(" %d", dest_brd->brd_nasid);
 222                                if (dest_brd->brd_type == KLTYPE_ROUTER)
 223                                        pr_cont(" r");
 224                        }
 225                        pr_cont("\n");
 226
 227                } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
 228        }
 229}
 230
 231static unsigned long __init slot_getbasepfn(nasid_t nasid, int slot)
 232{
 233        return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
 234}
 235
 236static unsigned long __init slot_psize_compute(nasid_t nasid, int slot)
 237{
 238        lboard_t *brd;
 239        klmembnk_t *banks;
 240        unsigned long size;
 241
 242        /* Find the node board */
 243        brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
 244        if (!brd)
 245                return 0;
 246
 247        /* Get the memory bank structure */
 248        banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
 249        if (!banks)
 250                return 0;
 251
 252        /* Size in _Megabytes_ */
 253        size = (unsigned long)banks->membnk_bnksz[slot/4];
 254
 255        /* hack for 128 dimm banks */
 256        if (size <= 128) {
 257                if (slot % 4 == 0) {
 258                        size <<= 20;            /* size in bytes */
 259                        return size >> PAGE_SHIFT;
 260                } else
 261                        return 0;
 262        } else {
 263                size /= 4;
 264                size <<= 20;
 265                return size >> PAGE_SHIFT;
 266        }
 267}
 268
 269static void __init mlreset(void)
 270{
 271        u64 region_mask;
 272        nasid_t nasid;
 273
 274        master_nasid = get_nasid();
 275
 276        /*
 277         * Probe for all CPUs - this creates the cpumask and sets up the
 278         * mapping tables.  We need to do this as early as possible.
 279         */
 280#ifdef CONFIG_SMP
 281        cpu_node_probe();
 282#endif
 283
 284        init_topology_matrix();
 285        dump_topology();
 286
 287        region_mask = gen_region_mask();
 288
 289        setup_replication_mask();
 290
 291        /*
 292         * Set all nodes' calias sizes to 8k
 293         */
 294        for_each_online_node(nasid) {
 295                /*
 296                 * Always have node 0 in the region mask, otherwise
 297                 * CALIAS accesses get exceptions since the hub
 298                 * thinks it is a node 0 address.
 299                 */
 300                REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
 301                REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
 302
 303#ifdef LATER
 304                /*
 305                 * Set up all hubs to have a big window pointing at
 306                 * widget 0. Memory mode, widget 0, offset 0
 307                 */
 308                REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
 309                        ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
 310                        (0 << IIO_ITTE_WIDGET_SHIFT)));
 311#endif
 312        }
 313}
 314
 315static void __init szmem(void)
 316{
 317        unsigned long slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
 318        int slot;
 319        nasid_t node;
 320
 321        for_each_online_node(node) {
 322                nodebytes = 0;
 323                for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
 324                        slot_psize = slot_psize_compute(node, slot);
 325                        if (slot == 0)
 326                                slot0sz = slot_psize;
 327                        /*
 328                         * We need to refine the hack when we have replicated
 329                         * kernel text.
 330                         */
 331                        nodebytes += (1LL << SLOT_SHIFT);
 332
 333                        if (!slot_psize)
 334                                continue;
 335
 336                        if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
 337                                                (slot0sz << PAGE_SHIFT)) {
 338                                pr_info("Ignoring slot %d onwards on node %d\n",
 339                                                                slot, node);
 340                                slot = MAX_MEM_SLOTS;
 341                                continue;
 342                        }
 343                        memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
 344                                          PFN_PHYS(slot_psize), node);
 345                }
 346        }
 347}
 348
 349static void __init node_mem_init(nasid_t node)
 350{
 351        unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
 352        unsigned long slot_freepfn = node_getfirstfree(node);
 353        unsigned long start_pfn, end_pfn;
 354
 355        get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 356
 357        /*
 358         * Allocate the node data structures on the node first.
 359         */
 360        __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 361        memset(__node_data[node], 0, PAGE_SIZE);
 362
 363        NODE_DATA(node)->node_start_pfn = start_pfn;
 364        NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
 365
 366        cpumask_clear(&hub_data(node)->h_cpus);
 367
 368        slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
 369                               sizeof(struct hub_data));
 370
 371        memblock_reserve(slot_firstpfn << PAGE_SHIFT,
 372                         ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT));
 373}
 374
 375/*
 376 * A node with nothing.  We use it to avoid any special casing in
 377 * cpumask_of_node
 378 */
 379static struct node_data null_node = {
 380        .hub = {
 381                .h_cpus = CPU_MASK_NONE
 382        }
 383};
 384
 385/*
 386 * Currently, the intranode memory hole support assumes that each slot
 387 * contains at least 32 MBytes of memory. We assume all bootmem data
 388 * fits on the first slot.
 389 */
 390void __init prom_meminit(void)
 391{
 392        nasid_t node;
 393
 394        mlreset();
 395        szmem();
 396        max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
 397
 398        for (node = 0; node < MAX_NUMNODES; node++) {
 399                if (node_online(node)) {
 400                        node_mem_init(node);
 401                        continue;
 402                }
 403                __node_data[node] = &null_node;
 404        }
 405}
 406
 407extern void setup_zero_pages(void);
 408
 409void __init paging_init(void)
 410{
 411        unsigned long zones_size[MAX_NR_ZONES] = {0, };
 412
 413        pagetable_init();
 414        zones_size[ZONE_NORMAL] = max_low_pfn;
 415        free_area_init(zones_size);
 416}
 417
 418void __init mem_init(void)
 419{
 420        high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 421        memblock_free_all();
 422        setup_zero_pages();     /* This comes from node 0 */
 423}
 424