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
  36 struct node_data *__node_data[MAX_NUMNODES];
  37
  38 EXPORT_SYMBOL(__node_data);
  39
  40 static 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
  56 static int router_distance;
  57
  58 static 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
  94 unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
  95 EXPORT_SYMBOL(__node_distances);
  96
  97 static 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
 159 static 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
 175 static 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
 231 static unsigned long __init slot_getbasepfn(nasid_t nasid, int slot)
 232 {
 233         return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
 234 }
 235
 236 static 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
 269 static 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
 315 static 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
 349 static 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  */
 379 static 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  */
 390 void __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         memblocks_present();
 407 }
 408
 409 void __init prom_free_prom_memory(void)
 410 {
 411         /* We got nothing to free here ...  */
 412 }
 413
 414 extern void setup_zero_pages(void);
 415
 416 void __init paging_init(void)
 417 {
 418         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 419
 420         pagetable_init();
 421         zones_size[ZONE_NORMAL] = max_low_pfn;
 422         free_area_init_nodes(zones_size);
 423 }
 424
 425 void __init mem_init(void)
 426 {
 427         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
 428         memblock_free_all();
 429         setup_zero_pages();     /* This comes from node 0 */
 430         mem_init_print_info(NULL);
 431 }