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 #include <asm/sgialib.h>
  27
  28 #include <asm/sn/arch.h>
  29 #include <asm/sn/agent.h>
  30 #include <asm/sn/klconfig.h>
  31
  32 #include "ip27-common.h"
  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_NUMNODES];
  38
  39 EXPORT_SYMBOL(__node_data);
  40
  41 static u64 gen_region_mask(void)
  42 {
  43         int region_shift;
  44         u64 region_mask;
  45         nasid_t nasid;
  46
  47         region_shift = get_region_shift();
  48         region_mask = 0;
  49         for_each_online_node(nasid)
  50                 region_mask |= BIT_ULL(nasid >> region_shift);
  51
  52         return region_mask;
  53 }
  54
  55 #define rou_rflag       rou_flags
  56
  57 static int router_distance;
  58
  59 static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
  60 {
  61         klrou_t *router;
  62         lboard_t *brd;
  63         int     port;
  64
  65         if (router_a->rou_rflag == 1)
  66                 return;
  67
  68         if (depth >= router_distance)
  69                 return;
  70
  71         router_a->rou_rflag = 1;
  72
  73         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
  74                 if (router_a->rou_port[port].port_nasid == INVALID_NASID)
  75                         continue;
  76
  77                 brd = (lboard_t *)NODE_OFFSET_TO_K0(
  78                         router_a->rou_port[port].port_nasid,
  79                         router_a->rou_port[port].port_offset);
  80
  81                 if (brd->brd_type == KLTYPE_ROUTER) {
  82                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
  83                         if (router == router_b) {
  84                                 if (depth < router_distance)
  85                                         router_distance = depth;
  86                         }
  87                         else
  88                                 router_recurse(router, router_b, depth + 1);
  89                 }
  90         }
  91
  92         router_a->rou_rflag = 0;
  93 }
  94
  95 unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
  96 EXPORT_SYMBOL(__node_distances);
  97
  98 static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
  99 {
 100         klrou_t *router, *router_a = NULL, *router_b = NULL;
 101         lboard_t *brd, *dest_brd;
 102         nasid_t nasid;
 103         int port;
 104
 105         /* Figure out which routers nodes in question are connected to */
 106         for_each_online_node(nasid) {
 107                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 108                                         KLTYPE_ROUTER);
 109
 110                 if (!brd)
 111                         continue;
 112
 113                 do {
 114                         if (brd->brd_flags & DUPLICATE_BOARD)
 115                                 continue;
 116
 117                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 118                         router->rou_rflag = 0;
 119
 120                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 121                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 122                                         continue;
 123
 124                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 125                                         router->rou_port[port].port_nasid,
 126                                         router->rou_port[port].port_offset);
 127
 128                                 if (dest_brd->brd_type == KLTYPE_IP27) {
 129                                         if (dest_brd->brd_nasid == nasid_a)
 130                                                 router_a = router;
 131                                         if (dest_brd->brd_nasid == nasid_b)
 132                                                 router_b = router;
 133                                 }
 134                         }
 135
 136                 } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
 137         }
 138
 139         if (nasid_a == nasid_b)
 140                 return LOCAL_DISTANCE;
 141
 142         if (router_a == router_b)
 143                 return LOCAL_DISTANCE + 1;
 144
 145         if (router_a == NULL) {
 146                 pr_info("node_distance: router_a NULL\n");
 147                 return 255;
 148         }
 149         if (router_b == NULL) {
 150                 pr_info("node_distance: router_b NULL\n");
 151                 return 255;
 152         }
 153
 154         router_distance = 100;
 155         router_recurse(router_a, router_b, 2);
 156
 157         return LOCAL_DISTANCE + router_distance;
 158 }
 159
 160 static void __init init_topology_matrix(void)
 161 {
 162         nasid_t row, col;
 163
 164         for (row = 0; row < MAX_NUMNODES; row++)
 165                 for (col = 0; col < MAX_NUMNODES; col++)
 166                         __node_distances[row][col] = -1;
 167
 168         for_each_online_node(row) {
 169                 for_each_online_node(col) {
 170                         __node_distances[row][col] =
 171                                 compute_node_distance(row, col);
 172                 }
 173         }
 174 }
 175
 176 static void __init dump_topology(void)
 177 {
 178         nasid_t nasid;
 179         lboard_t *brd, *dest_brd;
 180         int port;
 181         int router_num = 0;
 182         klrou_t *router;
 183         nasid_t row, col;
 184
 185         pr_info("************** Topology ********************\n");
 186
 187         pr_info("    ");
 188         for_each_online_node(col)
 189                 pr_cont("%02d ", col);
 190         pr_cont("\n");
 191         for_each_online_node(row) {
 192                 pr_info("%02d  ", row);
 193                 for_each_online_node(col)
 194                         pr_cont("%2d ", node_distance(row, col));
 195                 pr_cont("\n");
 196         }
 197
 198         for_each_online_node(nasid) {
 199                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 200                                         KLTYPE_ROUTER);
 201
 202                 if (!brd)
 203                         continue;
 204
 205                 do {
 206                         if (brd->brd_flags & DUPLICATE_BOARD)
 207                                 continue;
 208                         pr_cont("Router %d:", router_num);
 209                         router_num++;
 210
 211                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 212
 213                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 214                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 215                                         continue;
 216
 217                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 218                                         router->rou_port[port].port_nasid,
 219                                         router->rou_port[port].port_offset);
 220
 221                                 if (dest_brd->brd_type == KLTYPE_IP27)
 222                                         pr_cont(" %d", dest_brd->brd_nasid);
 223                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
 224                                         pr_cont(" r");
 225                         }
 226                         pr_cont("\n");
 227
 228                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
 229         }
 230 }
 231
 232 static unsigned long __init slot_getbasepfn(nasid_t nasid, int slot)
 233 {
 234         return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
 235 }
 236
 237 static unsigned long __init slot_psize_compute(nasid_t nasid, int slot)
 238 {
 239         lboard_t *brd;
 240         klmembnk_t *banks;
 241         unsigned long size;
 242
 243         /* Find the node board */
 244         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
 245         if (!brd)
 246                 return 0;
 247
 248         /* Get the memory bank structure */
 249         banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
 250         if (!banks)
 251                 return 0;
 252
 253         /* Size in _Megabytes_ */
 254         size = (unsigned long)banks->membnk_bnksz[slot/4];
 255
 256         /* hack for 128 dimm banks */
 257         if (size <= 128) {
 258                 if (slot % 4 == 0) {
 259                         size <<= 20;            /* size in bytes */
 260                         return size >> PAGE_SHIFT;
 261                 } else
 262                         return 0;
 263         } else {
 264                 size /= 4;
 265                 size <<= 20;
 266                 return size >> PAGE_SHIFT;
 267         }
 268 }
 269
 270 static void __init mlreset(void)
 271 {
 272         u64 region_mask;
 273         nasid_t nasid;
 274
 275         master_nasid = get_nasid();
 276
 277         /*
 278          * Probe for all CPUs - this creates the cpumask and sets up the
 279          * mapping tables.  We need to do this as early as possible.
 280          */
 281 #ifdef CONFIG_SMP
 282         cpu_node_probe();
 283 #endif
 284
 285         init_topology_matrix();
 286         dump_topology();
 287
 288         region_mask = gen_region_mask();
 289
 290         setup_replication_mask();
 291
 292         /*
 293          * Set all nodes' calias sizes to 8k
 294          */
 295         for_each_online_node(nasid) {
 296                 /*
 297                  * Always have node 0 in the region mask, otherwise
 298                  * CALIAS accesses get exceptions since the hub
 299                  * thinks it is a node 0 address.
 300                  */
 301                 REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
 302                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
 303
 304 #ifdef LATER
 305                 /*
 306                  * Set up all hubs to have a big window pointing at
 307                  * widget 0. Memory mode, widget 0, offset 0
 308                  */
 309                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
 310                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
 311                         (0 << IIO_ITTE_WIDGET_SHIFT)));
 312 #endif
 313         }
 314 }
 315
 316 static void __init szmem(void)
 317 {
 318         unsigned long slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
 319         int slot;
 320         nasid_t node;
 321
 322         for_each_online_node(node) {
 323                 nodebytes = 0;
 324                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
 325                         slot_psize = slot_psize_compute(node, slot);
 326                         if (slot == 0)
 327                                 slot0sz = slot_psize;
 328                         /*
 329                          * We need to refine the hack when we have replicated
 330                          * kernel text.
 331                          */
 332                         nodebytes += (1LL << SLOT_SHIFT);
 333
 334                         if (!slot_psize)
 335                                 continue;
 336
 337                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
 338                                                 (slot0sz << PAGE_SHIFT)) {
 339                                 pr_info("Ignoring slot %d onwards on node %d\n",
 340                                                                 slot, node);
 341                                 slot = MAX_MEM_SLOTS;
 342                                 continue;
 343                         }
 344                         memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
 345                                           PFN_PHYS(slot_psize), node,
 346                                           MEMBLOCK_NONE);
 347                 }
 348         }
 349 }
 350
 351 static void __init node_mem_init(nasid_t node)
 352 {
 353         unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
 354         unsigned long slot_freepfn = node_getfirstfree(node);
 355         unsigned long start_pfn, end_pfn;
 356
 357         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 358
 359         /*
 360          * Allocate the node data structures on the node first.
 361          */
 362         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 363         memset(__node_data[node], 0, PAGE_SIZE);
 364
 365         NODE_DATA(node)->node_start_pfn = start_pfn;
 366         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
 367
 368         cpumask_clear(&hub_data(node)->h_cpus);
 369
 370         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
 371                                sizeof(struct hub_data));
 372
 373         memblock_reserve(slot_firstpfn << PAGE_SHIFT,
 374                          ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT));
 375 }
 376
 377 /*
 378  * A node with nothing.  We use it to avoid any special casing in
 379  * cpumask_of_node
 380  */
 381 static struct node_data null_node = {
 382         .hub = {
 383                 .h_cpus = CPU_MASK_NONE
 384         }
 385 };
 386
 387 /*
 388  * Currently, the intranode memory hole support assumes that each slot
 389  * contains at least 32 MBytes of memory. We assume all bootmem data
 390  * fits on the first slot.
 391  */
 392 void __init prom_meminit(void)
 393 {
 394         nasid_t node;
 395
 396         mlreset();
 397         szmem();
 398         max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
 399
 400         for (node = 0; node < MAX_NUMNODES; node++) {
 401                 if (node_online(node)) {
 402                         node_mem_init(node);
 403                         continue;
 404                 }
 405                 __node_data[node] = &null_node;
 406         }
 407 }
 408
 409 extern void setup_zero_pages(void);
 410
 411 void __init paging_init(void)
 412 {
 413         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 414
 415         pagetable_init();
 416         zones_size[ZONE_NORMAL] = max_low_pfn;
 417         free_area_init(zones_size);
 418 }
 419
 420 void __init mem_init(void)
 421 {
 422         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 423         memblock_free_all();
 424         setup_zero_pages();     /* This comes from node 0 */
 425 }
 426
 427 pg_data_t * __init arch_alloc_nodedata(int nid)
 428 {
 429         return memblock_alloc(sizeof(pg_data_t), SMP_CACHE_BYTES);
 430 }
 431
 432 void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
 433 {
 434         __node_data[nid] = (struct node_data *)pgdat;
 435 }