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_NUMNODES];
  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(nasid_t nasid)
  48 {
  49         if (fine_mode)
  50                 return nasid >> NASID_TO_FINEREG_SHFT;
  51         else
  52                 return nasid >> NASID_TO_COARSEREG_SHFT;
  53 }
  54
  55 static u64 region_mask;
  56
  57 static void gen_region_mask(u64 *region_mask)
  58 {
  59         nasid_t nasid;
  60
  61         (*region_mask) = 0;
  62         for_each_online_node(nasid) {
  63                 (*region_mask) |= 1ULL << get_region(nasid);
  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_NUMNODES][MAX_NUMNODES];
 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         nasid_t nasid;
 115         int port;
 116
 117         /* Figure out which routers nodes in question are connected to */
 118         for_each_online_node(nasid) {
 119                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 120                                         KLTYPE_ROUTER);
 121
 122                 if (!brd)
 123                         continue;
 124
 125                 do {
 126                         if (brd->brd_flags & DUPLICATE_BOARD)
 127                                 continue;
 128
 129                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 130                         router->rou_rflag = 0;
 131
 132                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 133                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 134                                         continue;
 135
 136                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 137                                         router->rou_port[port].port_nasid,
 138                                         router->rou_port[port].port_offset);
 139
 140                                 if (dest_brd->brd_type == KLTYPE_IP27) {
 141                                         if (dest_brd->brd_nasid == nasid_a)
 142                                                 router_a = router;
 143                                         if (dest_brd->brd_nasid == nasid_b)
 144                                                 router_b = router;
 145                                 }
 146                         }
 147
 148                 } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
 149         }
 150
 151         if (router_a == NULL) {
 152                 pr_info("node_distance: router_a NULL\n");
 153                 return -1;
 154         }
 155         if (router_b == NULL) {
 156                 pr_info("node_distance: router_b NULL\n");
 157                 return -1;
 158         }
 159
 160         if (nasid_a == nasid_b)
 161                 return 0;
 162
 163         if (router_a == router_b)
 164                 return 1;
 165
 166         router_distance = 100;
 167         router_recurse(router_a, router_b, 2);
 168
 169         return router_distance;
 170 }
 171
 172 static void __init init_topology_matrix(void)
 173 {
 174         nasid_t row, col;
 175
 176         for (row = 0; row < MAX_NUMNODES; row++)
 177                 for (col = 0; col < MAX_NUMNODES; col++)
 178                         __node_distances[row][col] = -1;
 179
 180         for_each_online_node(row) {
 181                 for_each_online_node(col) {
 182                         __node_distances[row][col] =
 183                                 compute_node_distance(row, col);
 184                 }
 185         }
 186 }
 187
 188 static void __init dump_topology(void)
 189 {
 190         nasid_t nasid;
 191         lboard_t *brd, *dest_brd;
 192         int port;
 193         int router_num = 0;
 194         klrou_t *router;
 195         nasid_t row, col;
 196
 197         pr_info("************** Topology ********************\n");
 198
 199         pr_info("    ");
 200         for_each_online_node(col)
 201                 pr_cont("%02d ", col);
 202         pr_cont("\n");
 203         for_each_online_node(row) {
 204                 pr_info("%02d  ", row);
 205                 for_each_online_node(col)
 206                         pr_cont("%2d ", node_distance(row, col));
 207                 pr_cont("\n");
 208         }
 209
 210         for_each_online_node(nasid) {
 211                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
 212                                         KLTYPE_ROUTER);
 213
 214                 if (!brd)
 215                         continue;
 216
 217                 do {
 218                         if (brd->brd_flags & DUPLICATE_BOARD)
 219                                 continue;
 220                         pr_cont("Router %d:", router_num);
 221                         router_num++;
 222
 223                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
 224
 225                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
 226                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
 227                                         continue;
 228
 229                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
 230                                         router->rou_port[port].port_nasid,
 231                                         router->rou_port[port].port_offset);
 232
 233                                 if (dest_brd->brd_type == KLTYPE_IP27)
 234                                         pr_cont(" %d", dest_brd->brd_nasid);
 235                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
 236                                         pr_cont(" r");
 237                         }
 238                         pr_cont("\n");
 239
 240                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
 241         }
 242 }
 243
 244 static unsigned long __init slot_getbasepfn(nasid_t nasid, int slot)
 245 {
 246         return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
 247 }
 248
 249 static unsigned long __init slot_psize_compute(nasid_t nasid, int slot)
 250 {
 251         lboard_t *brd;
 252         klmembnk_t *banks;
 253         unsigned long size;
 254
 255         /* Find the node board */
 256         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
 257         if (!brd)
 258                 return 0;
 259
 260         /* Get the memory bank structure */
 261         banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
 262         if (!banks)
 263                 return 0;
 264
 265         /* Size in _Megabytes_ */
 266         size = (unsigned long)banks->membnk_bnksz[slot/4];
 267
 268         /* hack for 128 dimm banks */
 269         if (size <= 128) {
 270                 if (slot % 4 == 0) {
 271                         size <<= 20;            /* size in bytes */
 272                         return size >> PAGE_SHIFT;
 273                 } else
 274                         return 0;
 275         } else {
 276                 size /= 4;
 277                 size <<= 20;
 278                 return size >> PAGE_SHIFT;
 279         }
 280 }
 281
 282 static void __init mlreset(void)
 283 {
 284         nasid_t nasid;
 285
 286         master_nasid = get_nasid();
 287         fine_mode = is_fine_dirmode();
 288
 289         /*
 290          * Probe for all CPUs - this creates the cpumask and sets up the
 291          * mapping tables.  We need to do this as early as possible.
 292          */
 293 #ifdef CONFIG_SMP
 294         cpu_node_probe();
 295 #endif
 296
 297         init_topology_matrix();
 298         dump_topology();
 299
 300         gen_region_mask(&region_mask);
 301
 302         setup_replication_mask();
 303
 304         /*
 305          * Set all nodes' calias sizes to 8k
 306          */
 307         for_each_online_node(nasid) {
 308                 /*
 309                  * Always have node 0 in the region mask, otherwise
 310                  * CALIAS accesses get exceptions since the hub
 311                  * thinks it is a node 0 address.
 312                  */
 313                 REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
 314                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
 315
 316 #ifdef LATER
 317                 /*
 318                  * Set up all hubs to have a big window pointing at
 319                  * widget 0. Memory mode, widget 0, offset 0
 320                  */
 321                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
 322                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
 323                         (0 << IIO_ITTE_WIDGET_SHIFT)));
 324 #endif
 325         }
 326 }
 327
 328 static void __init szmem(void)
 329 {
 330         unsigned long slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
 331         int slot;
 332         nasid_t node;
 333
 334         for_each_online_node(node) {
 335                 nodebytes = 0;
 336                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
 337                         slot_psize = slot_psize_compute(node, slot);
 338                         if (slot == 0)
 339                                 slot0sz = slot_psize;
 340                         /*
 341                          * We need to refine the hack when we have replicated
 342                          * kernel text.
 343                          */
 344                         nodebytes += (1LL << SLOT_SHIFT);
 345
 346                         if (!slot_psize)
 347                                 continue;
 348
 349                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
 350                                                 (slot0sz << PAGE_SHIFT)) {
 351                                 pr_info("Ignoring slot %d onwards on node %d\n",
 352                                                                 slot, node);
 353                                 slot = MAX_MEM_SLOTS;
 354                                 continue;
 355                         }
 356                         memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
 357                                           PFN_PHYS(slot_psize), node);
 358                 }
 359         }
 360 }
 361
 362 static void __init node_mem_init(nasid_t node)
 363 {
 364         unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
 365         unsigned long slot_freepfn = node_getfirstfree(node);
 366         unsigned long start_pfn, end_pfn;
 367
 368         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
 369
 370         /*
 371          * Allocate the node data structures on the node first.
 372          */
 373         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 374         memset(__node_data[node], 0, PAGE_SIZE);
 375
 376         NODE_DATA(node)->node_start_pfn = start_pfn;
 377         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
 378
 379         cpumask_clear(&hub_data(node)->h_cpus);
 380
 381         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
 382                                sizeof(struct hub_data));
 383
 384         memblock_reserve(slot_firstpfn << PAGE_SHIFT,
 385                          ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT));
 386 }
 387
 388 /*
 389  * A node with nothing.  We use it to avoid any special casing in
 390  * cpumask_of_node
 391  */
 392 static struct node_data null_node = {
 393         .hub = {
 394                 .h_cpus = CPU_MASK_NONE
 395         }
 396 };
 397
 398 /*
 399  * Currently, the intranode memory hole support assumes that each slot
 400  * contains at least 32 MBytes of memory. We assume all bootmem data
 401  * fits on the first slot.
 402  */
 403 void __init prom_meminit(void)
 404 {
 405         nasid_t node;
 406
 407         mlreset();
 408         szmem();
 409         max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
 410
 411         for (node = 0; node < MAX_NUMNODES; node++) {
 412                 if (node_online(node)) {
 413                         node_mem_init(node);
 414                         continue;
 415                 }
 416                 __node_data[node] = &null_node;
 417         }
 418
 419         memblocks_present();
 420 }
 421
 422 void __init prom_free_prom_memory(void)
 423 {
 424         /* We got nothing to free here ...  */
 425 }
 426
 427 extern void setup_zero_pages(void);
 428
 429 void __init paging_init(void)
 430 {
 431         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 432
 433         pagetable_init();
 434         zones_size[ZONE_NORMAL] = max_low_pfn;
 435         free_area_init_nodes(zones_size);
 436 }
 437
 438 void __init mem_init(void)
 439 {
 440         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 441         memblock_free_all();
 442         setup_zero_pages();     /* This comes from node 0 */
 443         mem_init_print_info(NULL);
 444 }