arch/alpha/mm/numa.c

   1 /*
   2  *  linux/arch/alpha/mm/numa.c
   3  *
   4  *  DISCONTIGMEM NUMA alpha support.
   5  *
   6  *  Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/bootmem.h>
  13 #include <linux/swap.h>
  14 #include <linux/initrd.h>
  15 #include <linux/pfn.h>
  16
  17 #include <asm/hwrpb.h>
  18 #include <asm/pgalloc.h>
  19
  20 pg_data_t node_data[MAX_NUMNODES];
  21 bootmem_data_t node_bdata[MAX_NUMNODES];
  22
  23 #undef DEBUG_DISCONTIG
  24 #ifdef DEBUG_DISCONTIG
  25 #define DBGDCONT(args...) printk(args)
  26 #else
  27 #define DBGDCONT(args...)
  28 #endif
  29
  30 #define for_each_mem_cluster(memdesc, cluster, i)               \
  31         for ((cluster) = (memdesc)->cluster, (i) = 0;           \
  32              (i) < (memdesc)->numclusters; (i)++, (cluster)++)
  33
  34 static void __init show_mem_layout(void)
  35 {
  36         struct memclust_struct * cluster;
  37         struct memdesc_struct * memdesc;
  38         int i;
  39
  40         /* Find free clusters, and init and free the bootmem accordingly.  */
  41         memdesc = (struct memdesc_struct *)
  42           (hwrpb->mddt_offset + (unsigned long) hwrpb);
  43
  44         printk("Raw memory layout:\n");
  45         for_each_mem_cluster(memdesc, cluster, i) {
  46                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
  47                        i, cluster->usage, cluster->start_pfn,
  48                        cluster->start_pfn + cluster->numpages);
  49         }
  50 }
  51
  52 static void __init
  53 setup_memory_node(int nid, void *kernel_end)
  54 {
  55         extern unsigned long mem_size_limit;
  56         struct memclust_struct * cluster;
  57         struct memdesc_struct * memdesc;
  58         unsigned long start_kernel_pfn, end_kernel_pfn;
  59         unsigned long bootmap_size, bootmap_pages, bootmap_start;
  60         unsigned long start, end;
  61         unsigned long node_pfn_start, node_pfn_end;
  62         unsigned long node_min_pfn, node_max_pfn;
  63         int i;
  64         unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
  65         int show_init = 0;
  66
  67         /* Find the bounds of current node */
  68         node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
  69         node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
  70
  71         /* Find free clusters, and init and free the bootmem accordingly.  */
  72         memdesc = (struct memdesc_struct *)
  73           (hwrpb->mddt_offset + (unsigned long) hwrpb);
  74
  75         /* find the bounds of this node (node_min_pfn/node_max_pfn) */
  76         node_min_pfn = ~0UL;
  77         node_max_pfn = 0UL;
  78         for_each_mem_cluster(memdesc, cluster, i) {
  79                 /* Bit 0 is console/PALcode reserved.  Bit 1 is
  80                    non-volatile memory -- we might want to mark
  81                    this for later.  */
  82                 if (cluster->usage & 3)
  83                         continue;
  84
  85                 start = cluster->start_pfn;
  86                 end = start + cluster->numpages;
  87
  88                 if (start >= node_pfn_end || end <= node_pfn_start)
  89                         continue;
  90
  91                 if (!show_init) {
  92                         show_init = 1;
  93                         printk("Initializing bootmem allocator on Node ID %d\n", nid);
  94                 }
  95                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
  96                        i, cluster->usage, cluster->start_pfn,
  97                        cluster->start_pfn + cluster->numpages);
  98
  99                 if (start < node_pfn_start)
 100                         start = node_pfn_start;
 101                 if (end > node_pfn_end)
 102                         end = node_pfn_end;
 103
 104                 if (start < node_min_pfn)
 105                         node_min_pfn = start;
 106                 if (end > node_max_pfn)
 107                         node_max_pfn = end;
 108         }
 109
 110         if (mem_size_limit && node_max_pfn > mem_size_limit) {
 111                 static int msg_shown = 0;
 112                 if (!msg_shown) {
 113                         msg_shown = 1;
 114                         printk("setup: forcing memory size to %ldK (from %ldK).\n",
 115                                mem_size_limit << (PAGE_SHIFT - 10),
 116                                node_max_pfn    << (PAGE_SHIFT - 10));
 117                 }
 118                 node_max_pfn = mem_size_limit;
 119         }
 120
 121         if (node_min_pfn >= node_max_pfn)
 122                 return;
 123
 124         /* Update global {min,max}_low_pfn from node information. */
 125         if (node_min_pfn < min_low_pfn)
 126                 min_low_pfn = node_min_pfn;
 127         if (node_max_pfn > max_low_pfn)
 128                 max_pfn = max_low_pfn = node_max_pfn;
 129
 130         num_physpages += node_max_pfn - node_min_pfn;
 131
 132 #if 0 /* we'll try this one again in a little while */
 133         /* Cute trick to make sure our local node data is on local memory */
 134         node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
 135 #endif
 136         /* Quasi-mark the pg_data_t as in-use */
 137         node_min_pfn += node_datasz;
 138         if (node_min_pfn >= node_max_pfn) {
 139                 printk(" not enough mem to reserve NODE_DATA");
 140                 return;
 141         }
 142         NODE_DATA(nid)->bdata = &node_bdata[nid];
 143
 144         printk(" Detected node memory:   start %8lu, end %8lu\n",
 145                node_min_pfn, node_max_pfn);
 146
 147         DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
 148         DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
 149
 150         /* Find the bounds of kernel memory.  */
 151         start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
 152         end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
 153         bootmap_start = -1;
 154
 155         if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
 156                 panic("kernel loaded out of ram");
 157
 158         /* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
 159            Note that we round this down, not up - node memory
 160            has much larger alignment than 8Mb, so it's safe. */
 161         node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
 162
 163         /* We need to know how many physically contiguous pages
 164            we'll need for the bootmap.  */
 165         bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
 166
 167         /* Now find a good region where to allocate the bootmap.  */
 168         for_each_mem_cluster(memdesc, cluster, i) {
 169                 if (cluster->usage & 3)
 170                         continue;
 171
 172                 start = cluster->start_pfn;
 173                 end = start + cluster->numpages;
 174
 175                 if (start >= node_max_pfn || end <= node_min_pfn)
 176                         continue;
 177
 178                 if (end > node_max_pfn)
 179                         end = node_max_pfn;
 180                 if (start < node_min_pfn)
 181                         start = node_min_pfn;
 182
 183                 if (start < start_kernel_pfn) {
 184                         if (end > end_kernel_pfn
 185                             && end - end_kernel_pfn >= bootmap_pages) {
 186                                 bootmap_start = end_kernel_pfn;
 187                                 break;
 188                         } else if (end > start_kernel_pfn)
 189                                 end = start_kernel_pfn;
 190                 } else if (start < end_kernel_pfn)
 191                         start = end_kernel_pfn;
 192                 if (end - start >= bootmap_pages) {
 193                         bootmap_start = start;
 194                         break;
 195                 }
 196         }
 197
 198         if (bootmap_start == -1)
 199                 panic("couldn't find a contigous place for the bootmap");
 200
 201         /* Allocate the bootmap and mark the whole MM as reserved.  */
 202         bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
 203                                          node_min_pfn, node_max_pfn);
 204         DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
 205                  bootmap_start, bootmap_size, bootmap_pages);
 206
 207         /* Mark the free regions.  */
 208         for_each_mem_cluster(memdesc, cluster, i) {
 209                 if (cluster->usage & 3)
 210                         continue;
 211
 212                 start = cluster->start_pfn;
 213                 end = cluster->start_pfn + cluster->numpages;
 214
 215                 if (start >= node_max_pfn || end <= node_min_pfn)
 216                         continue;
 217
 218                 if (end > node_max_pfn)
 219                         end = node_max_pfn;
 220                 if (start < node_min_pfn)
 221                         start = node_min_pfn;
 222
 223                 if (start < start_kernel_pfn) {
 224                         if (end > end_kernel_pfn) {
 225                                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
 226                                              (PFN_PHYS(start_kernel_pfn)
 227                                               - PFN_PHYS(start)));
 228                                 printk(" freeing pages %ld:%ld\n",
 229                                        start, start_kernel_pfn);
 230                                 start = end_kernel_pfn;
 231                         } else if (end > start_kernel_pfn)
 232                                 end = start_kernel_pfn;
 233                 } else if (start < end_kernel_pfn)
 234                         start = end_kernel_pfn;
 235                 if (start >= end)
 236                         continue;
 237
 238                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
 239                 printk(" freeing pages %ld:%ld\n", start, end);
 240         }
 241
 242         /* Reserve the bootmap memory.  */
 243         reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start), bootmap_size);
 244         printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
 245
 246         node_set_online(nid);
 247 }
 248
 249 void __init
 250 setup_memory(void *kernel_end)
 251 {
 252         int nid;
 253
 254         show_mem_layout();
 255
 256         nodes_clear(node_online_map);
 257
 258         min_low_pfn = ~0UL;
 259         max_low_pfn = 0UL;
 260         for (nid = 0; nid < MAX_NUMNODES; nid++)
 261                 setup_memory_node(nid, kernel_end);
 262
 263 #ifdef CONFIG_BLK_DEV_INITRD
 264         initrd_start = INITRD_START;
 265         if (initrd_start) {
 266                 extern void *move_initrd(unsigned long);
 267
 268                 initrd_end = initrd_start+INITRD_SIZE;
 269                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 270                        (void *) initrd_start, INITRD_SIZE);
 271
 272                 if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
 273                         if (!move_initrd(PFN_PHYS(max_low_pfn)))
 274                                 printk("initrd extends beyond end of memory "
 275                                        "(0x%08lx > 0x%p)\ndisabling initrd\n",
 276                                        initrd_end,
 277                                        phys_to_virt(PFN_PHYS(max_low_pfn)));
 278                 } else {
 279                         nid = kvaddr_to_nid(initrd_start);
 280                         reserve_bootmem_node(NODE_DATA(nid),
 281                                              virt_to_phys((void *)initrd_start),
 282                                              INITRD_SIZE);
 283                 }
 284         }
 285 #endif /* CONFIG_BLK_DEV_INITRD */
 286 }
 287
 288 void __init paging_init(void)
 289 {
 290         unsigned int    nid;
 291         unsigned long   zones_size[MAX_NR_ZONES] = {0, };
 292         unsigned long   dma_local_pfn;
 293
 294         /*
 295          * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
 296          * in the NUMA model, for now we convert it to a pfn and
 297          * we interpret this pfn as a local per-node information.
 298          * This issue isn't very important since none of these machines
 299          * have legacy ISA slots anyways.
 300          */
 301         dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 302
 303         for_each_online_node(nid) {
 304                 unsigned long start_pfn = node_bdata[nid].node_boot_start >> PAGE_SHIFT;
 305                 unsigned long end_pfn = node_bdata[nid].node_low_pfn;
 306
 307                 if (dma_local_pfn >= end_pfn - start_pfn)
 308                         zones_size[ZONE_DMA] = end_pfn - start_pfn;
 309                 else {
 310                         zones_size[ZONE_DMA] = dma_local_pfn;
 311                         zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
 312                 }
 313                 free_area_init_node(nid, NODE_DATA(nid), zones_size, start_pfn, NULL);
 314         }
 315
 316         /* Initialize the kernel's ZERO_PGE. */
 317         memset((void *)ZERO_PGE, 0, PAGE_SIZE);
 318 }
 319
 320 void __init mem_init(void)
 321 {
 322         unsigned long codesize, reservedpages, datasize, initsize, pfn;
 323         extern int page_is_ram(unsigned long) __init;
 324         extern char _text, _etext, _data, _edata;
 325         extern char __init_begin, __init_end;
 326         unsigned long nid, i;
 327         high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 328
 329         reservedpages = 0;
 330         for_each_online_node(nid) {
 331                 /*
 332                  * This will free up the bootmem, ie, slot 0 memory
 333                  */
 334                 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
 335
 336                 pfn = NODE_DATA(nid)->node_start_pfn;
 337                 for (i = 0; i < node_spanned_pages(nid); i++, pfn++)
 338                         if (page_is_ram(pfn) &&
 339                             PageReserved(nid_page_nr(nid, i)))
 340                                 reservedpages++;
 341         }
 342
 343         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 344         datasize =  (unsigned long) &_edata - (unsigned long) &_data;
 345         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 346
 347         printk("Memory: %luk/%luk available (%luk kernel code, %luk reserved, "
 348                "%luk data, %luk init)\n",
 349                (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 350                num_physpages << (PAGE_SHIFT-10),
 351                codesize >> 10,
 352                reservedpages << (PAGE_SHIFT-10),
 353                datasize >> 10,
 354                initsize >> 10);
 355 #if 0
 356         mem_stress();
 357 #endif
 358 }
 359
 360 void
 361 show_mem(void)
 362 {
 363         long i,free = 0,total = 0,reserved = 0;
 364         long shared = 0, cached = 0;
 365         int nid;
 366
 367         printk("\nMem-info:\n");
 368         show_free_areas();
 369         printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
 370         for_each_online_node(nid) {
 371                 unsigned long flags;
 372                 pgdat_resize_lock(NODE_DATA(nid), &flags);
 373                 i = node_spanned_pages(nid);
 374                 while (i-- > 0) {
 375                         struct page *page = nid_page_nr(nid, i);
 376                         total++;
 377                         if (PageReserved(page))
 378                                 reserved++;
 379                         else if (PageSwapCache(page))
 380                                 cached++;
 381                         else if (!page_count(page))
 382                                 free++;
 383                         else
 384                                 shared += page_count(page) - 1;
 385                 }
 386                 pgdat_resize_unlock(NODE_DATA(nid), &flags);
 387         }
 388         printk("%ld pages of RAM\n",total);
 389         printk("%ld free pages\n",free);
 390         printk("%ld reserved pages\n",reserved);
 391         printk("%ld pages shared\n",shared);
 392         printk("%ld pages swap cached\n",cached);
 393 }