root/arch/mips/sgi-ip27/ip27-memory.c

DEFINITIONS

1. is_fine_dirmode
2. get_region
3. gen_region_mask
4. router_recurse
5. compute_node_distance
6. init_topology_matrix
7. dump_topology
8. slot_getbasepfn
9. slot_psize_compute
10. mlreset
11. szmem
12. node_mem_init
13. prom_meminit
14. prom_free_prom_memory
15. paging_init
16. mem_init

   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                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
 336 
 337 #ifdef LATER
 338                 /*
 339                  * Set up all hubs to have a big window pointing at
 340                  * widget 0. Memory mode, widget 0, offset 0
 341                  */
 342                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
 343                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
 344                         (0 << IIO_ITTE_WIDGET_SHIFT)));
 345 #endif
 346         }
 347 }
 348 
 349 static void __init szmem(void)
 350 {
 351         unsigned long slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
 352         int slot;
 353         cnodeid_t node;
 354 
 355         for_each_online_node(node) {
 356                 nodebytes = 0;
 357                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
 358                         slot_psize = slot_psize_compute(node, slot);
 359                         if (slot == 0)
 360                                 slot0sz = slot_psize;
 361                         /*
 362                          * We need to refine the hack when we have replicated
 363                          * kernel text.
 364                          */
 365                         nodebytes += (1LL << SLOT_SHIFT);
 366 
 367                         if (!slot_psize)
 368                                 continue;
 369 
 370                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
 371                                                 (slot0sz << PAGE_SHIFT)) {
 372                                 pr_info("Ignoring slot %d onwards on node %d\n",
 373                                                                 slot, node);
 374                                 slot = MAX_MEM_SLOTS;
 375                                 continue;
 376                         }
 377                         memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
 378                                           PFN_PHYS(slot_psize), node);
 379                 }
 380         }
 381 }
 382 
 383 static void __init node_mem_init(cnodeid_t node)
 384 {
 385         unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
 386         unsigned long slot_freepfn = node_getfirstfree(node);
 387         unsigned long start_pfn, end_pfn;
 388 
 389         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 390 
 391         /*
 392          * Allocate the node data structures on the node first.
 393          */
 394         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 395         memset(__node_data[node], 0, PAGE_SIZE);
 396 
 397         NODE_DATA(node)->node_start_pfn = start_pfn;
 398         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
 399 
 400         cpumask_clear(&hub_data(node)->h_cpus);
 401 
 402         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
 403                                sizeof(struct hub_data));
 404 
 405         free_bootmem_with_active_regions(node, end_pfn);
 406 
 407         memblock_reserve(slot_firstpfn << PAGE_SHIFT,
 408                          ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT));
 409 
 410         sparse_memory_present_with_active_regions(node);
 411 }
 412 
 413 /*
 414  * A node with nothing.  We use it to avoid any special casing in
 415  * cpumask_of_node
 416  */
 417 static struct node_data null_node = {
 418         .hub = {
 419                 .h_cpus = CPU_MASK_NONE
 420         }
 421 };
 422 
 423 /*
 424  * Currently, the intranode memory hole support assumes that each slot
 425  * contains at least 32 MBytes of memory. We assume all bootmem data
 426  * fits on the first slot.
 427  */
 428 void __init prom_meminit(void)
 429 {
 430         cnodeid_t node;
 431 
 432         mlreset();
 433         szmem();
 434         max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
 435 
 436         for (node = 0; node < MAX_COMPACT_NODES; node++) {
 437                 if (node_online(node)) {
 438                         node_mem_init(node);
 439                         continue;
 440                 }
 441                 __node_data[node] = &null_node;
 442         }
 443 }
 444 
 445 void __init prom_free_prom_memory(void)
 446 {
 447         /* We got nothing to free here ...  */
 448 }
 449 
 450 extern void setup_zero_pages(void);
 451 
 452 void __init paging_init(void)
 453 {
 454         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 455 
 456         pagetable_init();
 457         zones_size[ZONE_NORMAL] = max_low_pfn;
 458         free_area_init_nodes(zones_size);
 459 }
 460 
 461 void __init mem_init(void)
 462 {
 463         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 464         memblock_free_all();
 465         setup_zero_pages();     /* This comes from node 0 */
 466         mem_init_print_info(NULL);
 467 }