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 #include <linux/module.h>
  17
  18 #include <asm/hwrpb.h>
  19 #include <asm/pgalloc.h>
  20
  21 pg_data_t node_data[MAX_NUMNODES];
  22 bootmem_data_t node_bdata[MAX_NUMNODES];
  23 EXPORT_SYMBOL(node_data);
  24
  25 #undef DEBUG_DISCONTIG
  26 #ifdef DEBUG_DISCONTIG
  27 #define DBGDCONT(args...) printk(args)
  28 #else
  29 #define DBGDCONT(args...)
  30 #endif
  31
  32 #define for_each_mem_cluster(memdesc, cluster, i)               \
  33         for ((cluster) = (memdesc)->cluster, (i) = 0;           \
  34              (i) < (memdesc)->numclusters; (i)++, (cluster)++)
  35
  36 static void __init show_mem_layout(void)
  37 {
  38         struct memclust_struct * cluster;
  39         struct memdesc_struct * memdesc;
  40         int i;
  41
  42         /* Find free clusters, and init and free the bootmem accordingly.  */
  43         memdesc = (struct memdesc_struct *)
  44           (hwrpb->mddt_offset + (unsigned long) hwrpb);
  45
  46         printk("Raw memory layout:\n");
  47         for_each_mem_cluster(memdesc, cluster, i) {
  48                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
  49                        i, cluster->usage, cluster->start_pfn,
  50                        cluster->start_pfn + cluster->numpages);
  51         }
  52 }
  53
  54 static void __init
  55 setup_memory_node(int nid, void *kernel_end)
  56 {
  57         extern unsigned long mem_size_limit;
  58         struct memclust_struct * cluster;
  59         struct memdesc_struct * memdesc;
  60         unsigned long start_kernel_pfn, end_kernel_pfn;
  61         unsigned long bootmap_size, bootmap_pages, bootmap_start;
  62         unsigned long start, end;
  63         unsigned long node_pfn_start, node_pfn_end;
  64         unsigned long node_min_pfn, node_max_pfn;
  65         int i;
  66         unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
  67         int show_init = 0;
  68
  69         /* Find the bounds of current node */
  70         node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
  71         node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
  72
  73         /* Find free clusters, and init and free the bootmem accordingly.  */
  74         memdesc = (struct memdesc_struct *)
  75           (hwrpb->mddt_offset + (unsigned long) hwrpb);
  76
  77         /* find the bounds of this node (node_min_pfn/node_max_pfn) */
  78         node_min_pfn = ~0UL;
  79         node_max_pfn = 0UL;
  80         for_each_mem_cluster(memdesc, cluster, i) {
  81                 /* Bit 0 is console/PALcode reserved.  Bit 1 is
  82                    non-volatile memory -- we might want to mark
  83                    this for later.  */
  84                 if (cluster->usage & 3)
  85                         continue;
  86
  87                 start = cluster->start_pfn;
  88                 end = start + cluster->numpages;
  89
  90                 if (start >= node_pfn_end || end <= node_pfn_start)
  91                         continue;
  92
  93                 if (!show_init) {
  94                         show_init = 1;
  95                         printk("Initializing bootmem allocator on Node ID %d\n", nid);
  96                 }
  97                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
  98                        i, cluster->usage, cluster->start_pfn,
  99                        cluster->start_pfn + cluster->numpages);
 100
 101                 if (start < node_pfn_start)
 102                         start = node_pfn_start;
 103                 if (end > node_pfn_end)
 104                         end = node_pfn_end;
 105
 106                 if (start < node_min_pfn)
 107                         node_min_pfn = start;
 108                 if (end > node_max_pfn)
 109                         node_max_pfn = end;
 110         }
 111
 112         if (mem_size_limit && node_max_pfn > mem_size_limit) {
 113                 static int msg_shown = 0;
 114                 if (!msg_shown) {
 115                         msg_shown = 1;
 116                         printk("setup: forcing memory size to %ldK (from %ldK).\n",
 117                                mem_size_limit << (PAGE_SHIFT - 10),
 118                                node_max_pfn    << (PAGE_SHIFT - 10));
 119                 }
 120                 node_max_pfn = mem_size_limit;
 121         }
 122
 123         if (node_min_pfn >= node_max_pfn)
 124                 return;
 125
 126         /* Update global {min,max}_low_pfn from node information. */
 127         if (node_min_pfn < min_low_pfn)
 128                 min_low_pfn = node_min_pfn;
 129         if (node_max_pfn > max_low_pfn)
 130                 max_pfn = max_low_pfn = node_max_pfn;
 131
 132         num_physpages += node_max_pfn - node_min_pfn;
 133
 134 #if 0 /* we'll try this one again in a little while */
 135         /* Cute trick to make sure our local node data is on local memory */
 136         node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
 137 #endif
 138         /* Quasi-mark the pg_data_t as in-use */
 139         node_min_pfn += node_datasz;
 140         if (node_min_pfn >= node_max_pfn) {
 141                 printk(" not enough mem to reserve NODE_DATA");
 142                 return;
 143         }
 144         NODE_DATA(nid)->bdata = &node_bdata[nid];
 145
 146         printk(" Detected node memory:   start %8lu, end %8lu\n",
 147                node_min_pfn, node_max_pfn);
 148
 149         DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
 150         DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
 151
 152         /* Find the bounds of kernel memory.  */
 153         start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
 154         end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
 155         bootmap_start = -1;
 156
 157         if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
 158                 panic("kernel loaded out of ram");
 159
 160         /* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
 161            Note that we round this down, not up - node memory
 162            has much larger alignment than 8Mb, so it's safe. */
 163         node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
 164
 165         /* We need to know how many physically contiguous pages
 166            we'll need for the bootmap.  */
 167         bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
 168
 169         /* Now find a good region where to allocate the bootmap.  */
 170         for_each_mem_cluster(memdesc, cluster, i) {
 171                 if (cluster->usage & 3)
 172                         continue;
 173
 174                 start = cluster->start_pfn;
 175                 end = start + cluster->numpages;
 176
 177                 if (start >= node_max_pfn || end <= node_min_pfn)
 178                         continue;
 179
 180                 if (end > node_max_pfn)
 181                         end = node_max_pfn;
 182                 if (start < node_min_pfn)
 183                         start = node_min_pfn;
 184
 185                 if (start < start_kernel_pfn) {
 186                         if (end > end_kernel_pfn
 187                             && end - end_kernel_pfn >= bootmap_pages) {
 188                                 bootmap_start = end_kernel_pfn;
 189                                 break;
 190                         } else if (end > start_kernel_pfn)
 191                                 end = start_kernel_pfn;
 192                 } else if (start < end_kernel_pfn)
 193                         start = end_kernel_pfn;
 194                 if (end - start >= bootmap_pages) {
 195                         bootmap_start = start;
 196                         break;
 197                 }
 198         }
 199
 200         if (bootmap_start == -1)
 201                 panic("couldn't find a contigous place for the bootmap");
 202
 203         /* Allocate the bootmap and mark the whole MM as reserved.  */
 204         bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
 205                                          node_min_pfn, node_max_pfn);
 206         DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
 207                  bootmap_start, bootmap_size, bootmap_pages);
 208
 209         /* Mark the free regions.  */
 210         for_each_mem_cluster(memdesc, cluster, i) {
 211                 if (cluster->usage & 3)
 212                         continue;
 213
 214                 start = cluster->start_pfn;
 215                 end = cluster->start_pfn + cluster->numpages;
 216
 217                 if (start >= node_max_pfn || end <= node_min_pfn)
 218                         continue;
 219
 220                 if (end > node_max_pfn)
 221                         end = node_max_pfn;
 222                 if (start < node_min_pfn)
 223                         start = node_min_pfn;
 224
 225                 if (start < start_kernel_pfn) {
 226                         if (end > end_kernel_pfn) {
 227                                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
 228                                              (PFN_PHYS(start_kernel_pfn)
 229                                               - PFN_PHYS(start)));
 230                                 printk(" freeing pages %ld:%ld\n",
 231                                        start, start_kernel_pfn);
 232                                 start = end_kernel_pfn;
 233                         } else if (end > start_kernel_pfn)
 234                                 end = start_kernel_pfn;
 235                 } else if (start < end_kernel_pfn)
 236                         start = end_kernel_pfn;
 237                 if (start >= end)
 238                         continue;
 239
 240                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
 241                 printk(" freeing pages %ld:%ld\n", start, end);
 242         }
 243
 244         /* Reserve the bootmap memory.  */
 245         reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start),
 246                         bootmap_size, BOOTMEM_DEFAULT);
 247         printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
 248
 249         node_set_online(nid);
 250 }
 251
 252 void __init
 253 setup_memory(void *kernel_end)
 254 {
 255         int nid;
 256
 257         show_mem_layout();
 258
 259         nodes_clear(node_online_map);
 260
 261         min_low_pfn = ~0UL;
 262         max_low_pfn = 0UL;
 263         for (nid = 0; nid < MAX_NUMNODES; nid++)
 264                 setup_memory_node(nid, kernel_end);
 265
 266 #ifdef CONFIG_BLK_DEV_INITRD
 267         initrd_start = INITRD_START;
 268         if (initrd_start) {
 269                 extern void *move_initrd(unsigned long);
 270
 271                 initrd_end = initrd_start+INITRD_SIZE;
 272                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 273                        (void *) initrd_start, INITRD_SIZE);
 274
 275                 if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
 276                         if (!move_initrd(PFN_PHYS(max_low_pfn)))
 277                                 printk("initrd extends beyond end of memory "
 278                                        "(0x%08lx > 0x%p)\ndisabling initrd\n",
 279                                        initrd_end,
 280                                        phys_to_virt(PFN_PHYS(max_low_pfn)));
 281                 } else {
 282                         nid = kvaddr_to_nid(initrd_start);
 283                         reserve_bootmem_node(NODE_DATA(nid),
 284                                              virt_to_phys((void *)initrd_start),
 285                                              INITRD_SIZE, BOOTMEM_DEFAULT);
 286                 }
 287         }
 288 #endif /* CONFIG_BLK_DEV_INITRD */
 289 }
 290
 291 void __init paging_init(void)
 292 {
 293         unsigned int    nid;
 294         unsigned long   zones_size[MAX_NR_ZONES] = {0, };
 295         unsigned long   dma_local_pfn;
 296
 297         /*
 298          * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
 299          * in the NUMA model, for now we convert it to a pfn and
 300          * we interpret this pfn as a local per-node information.
 301          * This issue isn't very important since none of these machines
 302          * have legacy ISA slots anyways.
 303          */
 304         dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 305
 306         for_each_online_node(nid) {
 307                 unsigned long start_pfn = node_bdata[nid].node_boot_start >> PAGE_SHIFT;
 308                 unsigned long end_pfn = node_bdata[nid].node_low_pfn;
 309
 310                 if (dma_local_pfn >= end_pfn - start_pfn)
 311                         zones_size[ZONE_DMA] = end_pfn - start_pfn;
 312                 else {
 313                         zones_size[ZONE_DMA] = dma_local_pfn;
 314                         zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
 315                 }
 316                 free_area_init_node(nid, NODE_DATA(nid), zones_size, start_pfn, NULL);
 317         }
 318
 319         /* Initialize the kernel's ZERO_PGE. */
 320         memset((void *)ZERO_PGE, 0, PAGE_SIZE);
 321 }
 322
 323 void __init mem_init(void)
 324 {
 325         unsigned long codesize, reservedpages, datasize, initsize, pfn;
 326         extern int page_is_ram(unsigned long) __init;
 327         extern char _text, _etext, _data, _edata;
 328         extern char __init_begin, __init_end;
 329         unsigned long nid, i;
 330         high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 331
 332         reservedpages = 0;
 333         for_each_online_node(nid) {
 334                 /*
 335                  * This will free up the bootmem, ie, slot 0 memory
 336                  */
 337                 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
 338
 339                 pfn = NODE_DATA(nid)->node_start_pfn;
 340                 for (i = 0; i < node_spanned_pages(nid); i++, pfn++)
 341                         if (page_is_ram(pfn) &&
 342                             PageReserved(nid_page_nr(nid, i)))
 343                                 reservedpages++;
 344         }
 345
 346         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 347         datasize =  (unsigned long) &_edata - (unsigned long) &_data;
 348         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 349
 350         printk("Memory: %luk/%luk available (%luk kernel code, %luk reserved, "
 351                "%luk data, %luk init)\n",
 352                (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 353                num_physpages << (PAGE_SHIFT-10),
 354                codesize >> 10,
 355                reservedpages << (PAGE_SHIFT-10),
 356                datasize >> 10,
 357                initsize >> 10);
 358 #if 0
 359         mem_stress();
 360 #endif
 361 }
 362
 363 void
 364 show_mem(void)
 365 {
 366         long i,free = 0,total = 0,reserved = 0;
 367         long shared = 0, cached = 0;
 368         int nid;
 369
 370         printk("\nMem-info:\n");
 371         show_free_areas();
 372         printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
 373         for_each_online_node(nid) {
 374                 unsigned long flags;
 375                 pgdat_resize_lock(NODE_DATA(nid), &flags);
 376                 i = node_spanned_pages(nid);
 377                 while (i-- > 0) {
 378                         struct page *page = nid_page_nr(nid, i);
 379                         total++;
 380                         if (PageReserved(page))
 381                                 reserved++;
 382                         else if (PageSwapCache(page))
 383                                 cached++;
 384                         else if (!page_count(page))
 385                                 free++;
 386                         else
 387                                 shared += page_count(page) - 1;
 388                 }
 389                 pgdat_resize_unlock(NODE_DATA(nid), &flags);
 390         }
 391         printk("%ld pages of RAM\n",total);
 392         printk("%ld free pages\n",free);
 393         printk("%ld reserved pages\n",reserved);
 394         printk("%ld pages shared\n",shared);
 395         printk("%ld pages swap cached\n",cached);
 396 }