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/config.h>
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mm.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/swap.h>
  15 #include <linux/initrd.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 PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
  31 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
  32 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
  33 #define for_each_mem_cluster(memdesc, cluster, i)               \
  34         for ((cluster) = (memdesc)->cluster, (i) = 0;           \
  35              (i) < (memdesc)->numclusters; (i)++, (cluster)++)
  36
  37 static void __init show_mem_layout(void)
  38 {
  39         struct memclust_struct * cluster;
  40         struct memdesc_struct * memdesc;
  41         int i;
  42
  43         /* Find free clusters, and init and free the bootmem accordingly.  */
  44         memdesc = (struct memdesc_struct *)
  45           (hwrpb->mddt_offset + (unsigned long) hwrpb);
  46
  47         printk("Raw memory layout:\n");
  48         for_each_mem_cluster(memdesc, cluster, i) {
  49                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
  50                        i, cluster->usage, cluster->start_pfn,
  51                        cluster->start_pfn + cluster->numpages);
  52         }
  53 }
  54
  55 static void __init
  56 setup_memory_node(int nid, void *kernel_end)
  57 {
  58         extern unsigned long mem_size_limit;
  59         struct memclust_struct * cluster;
  60         struct memdesc_struct * memdesc;
  61         unsigned long start_kernel_pfn, end_kernel_pfn;
  62         unsigned long bootmap_size, bootmap_pages, bootmap_start;
  63         unsigned long start, end;
  64         unsigned long node_pfn_start, node_pfn_end;
  65         unsigned long node_min_pfn, node_max_pfn;
  66         int i;
  67         unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
  68         int show_init = 0;
  69
  70         /* Find the bounds of current node */
  71         node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
  72         node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
  73
  74         /* Find free clusters, and init and free the bootmem accordingly.  */
  75         memdesc = (struct memdesc_struct *)
  76           (hwrpb->mddt_offset + (unsigned long) hwrpb);
  77
  78         /* find the bounds of this node (node_min_pfn/node_max_pfn) */
  79         node_min_pfn = ~0UL;
  80         node_max_pfn = 0UL;
  81         for_each_mem_cluster(memdesc, cluster, i) {
  82                 /* Bit 0 is console/PALcode reserved.  Bit 1 is
  83                    non-volatile memory -- we might want to mark
  84                    this for later.  */
  85                 if (cluster->usage & 3)
  86                         continue;
  87
  88                 start = cluster->start_pfn;
  89                 end = start + cluster->numpages;
  90
  91                 if (start >= node_pfn_end || end <= node_pfn_start)
  92                         continue;
  93
  94                 if (!show_init) {
  95                         show_init = 1;
  96                         printk("Initializing bootmem allocator on Node ID %d\n", nid);
  97                 }
  98                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
  99                        i, cluster->usage, cluster->start_pfn,
 100                        cluster->start_pfn + cluster->numpages);
 101
 102                 if (start < node_pfn_start)
 103                         start = node_pfn_start;
 104                 if (end > node_pfn_end)
 105                         end = node_pfn_end;
 106
 107                 if (start < node_min_pfn)
 108                         node_min_pfn = start;
 109                 if (end > node_max_pfn)
 110                         node_max_pfn = end;
 111         }
 112
 113         if (mem_size_limit && node_max_pfn > mem_size_limit) {
 114                 static int msg_shown = 0;
 115                 if (!msg_shown) {
 116                         msg_shown = 1;
 117                         printk("setup: forcing memory size to %ldK (from %ldK).\n",
 118                                mem_size_limit << (PAGE_SHIFT - 10),
 119                                node_max_pfn    << (PAGE_SHIFT - 10));
 120                 }
 121                 node_max_pfn = mem_size_limit;
 122         }
 123
 124         if (node_min_pfn >= node_max_pfn)
 125                 return;
 126
 127         /* Update global {min,max}_low_pfn from node information. */
 128         if (node_min_pfn < min_low_pfn)
 129                 min_low_pfn = node_min_pfn;
 130         if (node_max_pfn > max_low_pfn)
 131                 max_pfn = max_low_pfn = node_max_pfn;
 132
 133         num_physpages += node_max_pfn - node_min_pfn;
 134
 135 #if 0 /* we'll try this one again in a little while */
 136         /* Cute trick to make sure our local node data is on local memory */
 137         node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
 138 #endif
 139         /* Quasi-mark the pg_data_t as in-use */
 140         node_min_pfn += node_datasz;
 141         if (node_min_pfn >= node_max_pfn) {
 142                 printk(" not enough mem to reserve NODE_DATA");
 143                 return;
 144         }
 145         NODE_DATA(nid)->bdata = &node_bdata[nid];
 146
 147         printk(" Detected node memory:   start %8lu, end %8lu\n",
 148                node_min_pfn, node_max_pfn);
 149
 150         DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
 151         DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
 152
 153         /* Find the bounds of kernel memory.  */
 154         start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
 155         end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
 156         bootmap_start = -1;
 157
 158         if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
 159                 panic("kernel loaded out of ram");
 160
 161         /* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
 162            Note that we round this down, not up - node memory
 163            has much larger alignment than 8Mb, so it's safe. */
 164         node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
 165
 166         /* We need to know how many physically contiguous pages
 167            we'll need for the bootmap.  */
 168         bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
 169
 170         /* Now find a good region where to allocate the bootmap.  */
 171         for_each_mem_cluster(memdesc, cluster, i) {
 172                 if (cluster->usage & 3)
 173                         continue;
 174
 175                 start = cluster->start_pfn;
 176                 end = start + cluster->numpages;
 177
 178                 if (start >= node_max_pfn || end <= node_min_pfn)
 179                         continue;
 180
 181                 if (end > node_max_pfn)
 182                         end = node_max_pfn;
 183                 if (start < node_min_pfn)
 184                         start = node_min_pfn;
 185
 186                 if (start < start_kernel_pfn) {
 187                         if (end > end_kernel_pfn
 188                             && end - end_kernel_pfn >= bootmap_pages) {
 189                                 bootmap_start = end_kernel_pfn;
 190                                 break;
 191                         } else if (end > start_kernel_pfn)
 192                                 end = start_kernel_pfn;
 193                 } else if (start < end_kernel_pfn)
 194                         start = end_kernel_pfn;
 195                 if (end - start >= bootmap_pages) {
 196                         bootmap_start = start;
 197                         break;
 198                 }
 199         }
 200
 201         if (bootmap_start == -1)
 202                 panic("couldn't find a contigous place for the bootmap");
 203
 204         /* Allocate the bootmap and mark the whole MM as reserved.  */
 205         bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
 206                                          node_min_pfn, node_max_pfn);
 207         DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
 208                  bootmap_start, bootmap_size, bootmap_pages);
 209
 210         /* Mark the free regions.  */
 211         for_each_mem_cluster(memdesc, cluster, i) {
 212                 if (cluster->usage & 3)
 213                         continue;
 214
 215                 start = cluster->start_pfn;
 216                 end = cluster->start_pfn + cluster->numpages;
 217
 218                 if (start >= node_max_pfn || end <= node_min_pfn)
 219                         continue;
 220
 221                 if (end > node_max_pfn)
 222                         end = node_max_pfn;
 223                 if (start < node_min_pfn)
 224                         start = node_min_pfn;
 225
 226                 if (start < start_kernel_pfn) {
 227                         if (end > end_kernel_pfn) {
 228                                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
 229                                              (PFN_PHYS(start_kernel_pfn)
 230                                               - PFN_PHYS(start)));
 231                                 printk(" freeing pages %ld:%ld\n",
 232                                        start, start_kernel_pfn);
 233                                 start = end_kernel_pfn;
 234                         } else if (end > start_kernel_pfn)
 235                                 end = start_kernel_pfn;
 236                 } else if (start < end_kernel_pfn)
 237                         start = end_kernel_pfn;
 238                 if (start >= end)
 239                         continue;
 240
 241                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
 242                 printk(" freeing pages %ld:%ld\n", start, end);
 243         }
 244
 245         /* Reserve the bootmap memory.  */
 246         reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start), bootmap_size);
 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);
 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                 i = node_spanned_pages(nid);
 375                 while (i-- > 0) {
 376                         struct page *page = nid_page_nr(nid, i);
 377                         total++;
 378                         if (PageReserved(page))
 379                                 reserved++;
 380                         else if (PageSwapCache(page))
 381                                 cached++;
 382                         else if (!page_count(page))
 383                                 free++;
 384                         else
 385                                 shared += page_count(page) - 1;
 386                 }
 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 }