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 EXPORT_SYMBOL(node_data);
  23
  24 #undef DEBUG_DISCONTIG
  25 #ifdef DEBUG_DISCONTIG
  26 #define DBGDCONT(args...) printk(args)
  27 #else
  28 #define DBGDCONT(args...)
  29 #endif
  30
  31 #define for_each_mem_cluster(memdesc, cluster, i)               \
  32         for ((cluster) = (memdesc)->cluster, (i) = 0;           \
  33              (i) < (memdesc)->numclusters; (i)++, (cluster)++)
  34
  35 static void __init show_mem_layout(void)
  36 {
  37         struct memclust_struct * cluster;
  38         struct memdesc_struct * memdesc;
  39         int i;
  40
  41         /* Find free clusters, and init and free the bootmem accordingly.  */
  42         memdesc = (struct memdesc_struct *)
  43           (hwrpb->mddt_offset + (unsigned long) hwrpb);
  44
  45         printk("Raw memory layout:\n");
  46         for_each_mem_cluster(memdesc, cluster, i) {
  47                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
  48                        i, cluster->usage, cluster->start_pfn,
  49                        cluster->start_pfn + cluster->numpages);
  50         }
  51 }
  52
  53 static void __init
  54 setup_memory_node(int nid, void *kernel_end)
  55 {
  56         extern unsigned long mem_size_limit;
  57         struct memclust_struct * cluster;
  58         struct memdesc_struct * memdesc;
  59         unsigned long start_kernel_pfn, end_kernel_pfn;
  60         unsigned long bootmap_size, bootmap_pages, bootmap_start;
  61         unsigned long start, end;
  62         unsigned long node_pfn_start, node_pfn_end;
  63         unsigned long node_min_pfn, node_max_pfn;
  64         int i;
  65         unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
  66         int show_init = 0;
  67
  68         /* Find the bounds of current node */
  69         node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
  70         node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
  71
  72         /* Find free clusters, and init and free the bootmem accordingly.  */
  73         memdesc = (struct memdesc_struct *)
  74           (hwrpb->mddt_offset + (unsigned long) hwrpb);
  75
  76         /* find the bounds of this node (node_min_pfn/node_max_pfn) */
  77         node_min_pfn = ~0UL;
  78         node_max_pfn = 0UL;
  79         for_each_mem_cluster(memdesc, cluster, i) {
  80                 /* Bit 0 is console/PALcode reserved.  Bit 1 is
  81                    non-volatile memory -- we might want to mark
  82                    this for later.  */
  83                 if (cluster->usage & 3)
  84                         continue;
  85
  86                 start = cluster->start_pfn;
  87                 end = start + cluster->numpages;
  88
  89                 if (start >= node_pfn_end || end <= node_pfn_start)
  90                         continue;
  91
  92                 if (!show_init) {
  93                         show_init = 1;
  94                         printk("Initializing bootmem allocator on Node ID %d\n", nid);
  95                 }
  96                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
  97                        i, cluster->usage, cluster->start_pfn,
  98                        cluster->start_pfn + cluster->numpages);
  99
 100                 if (start < node_pfn_start)
 101                         start = node_pfn_start;
 102                 if (end > node_pfn_end)
 103                         end = node_pfn_end;
 104
 105                 if (start < node_min_pfn)
 106                         node_min_pfn = start;
 107                 if (end > node_max_pfn)
 108                         node_max_pfn = end;
 109         }
 110
 111         if (mem_size_limit && node_max_pfn > mem_size_limit) {
 112                 static int msg_shown = 0;
 113                 if (!msg_shown) {
 114                         msg_shown = 1;
 115                         printk("setup: forcing memory size to %ldK (from %ldK).\n",
 116                                mem_size_limit << (PAGE_SHIFT - 10),
 117                                node_max_pfn    << (PAGE_SHIFT - 10));
 118                 }
 119                 node_max_pfn = mem_size_limit;
 120         }
 121
 122         if (node_min_pfn >= node_max_pfn)
 123                 return;
 124
 125         /* Update global {min,max}_low_pfn from node information. */
 126         if (node_min_pfn < min_low_pfn)
 127                 min_low_pfn = node_min_pfn;
 128         if (node_max_pfn > max_low_pfn)
 129                 max_pfn = max_low_pfn = node_max_pfn;
 130
 131         num_physpages += node_max_pfn - node_min_pfn;
 132
 133 #if 0 /* we'll try this one again in a little while */
 134         /* Cute trick to make sure our local node data is on local memory */
 135         node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
 136 #endif
 137         /* Quasi-mark the pg_data_t as in-use */
 138         node_min_pfn += node_datasz;
 139         if (node_min_pfn >= node_max_pfn) {
 140                 printk(" not enough mem to reserve NODE_DATA");
 141                 return;
 142         }
 143         NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
 144
 145         printk(" Detected node memory:   start %8lu, end %8lu\n",
 146                node_min_pfn, node_max_pfn);
 147
 148         DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
 149         DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
 150
 151         /* Find the bounds of kernel memory.  */
 152         start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
 153         end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
 154         bootmap_start = -1;
 155
 156         if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
 157                 panic("kernel loaded out of ram");
 158
 159         /* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
 160            Note that we round this down, not up - node memory
 161            has much larger alignment than 8Mb, so it's safe. */
 162         node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
 163
 164         /* We need to know how many physically contiguous pages
 165            we'll need for the bootmap.  */
 166         bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
 167
 168         /* Now find a good region where to allocate the bootmap.  */
 169         for_each_mem_cluster(memdesc, cluster, i) {
 170                 if (cluster->usage & 3)
 171                         continue;
 172
 173                 start = cluster->start_pfn;
 174                 end = start + cluster->numpages;
 175
 176                 if (start >= node_max_pfn || end <= node_min_pfn)
 177                         continue;
 178
 179                 if (end > node_max_pfn)
 180                         end = node_max_pfn;
 181                 if (start < node_min_pfn)
 182                         start = node_min_pfn;
 183
 184                 if (start < start_kernel_pfn) {
 185                         if (end > end_kernel_pfn
 186                             && end - end_kernel_pfn >= bootmap_pages) {
 187                                 bootmap_start = end_kernel_pfn;
 188                                 break;
 189                         } else if (end > start_kernel_pfn)
 190                                 end = start_kernel_pfn;
 191                 } else if (start < end_kernel_pfn)
 192                         start = end_kernel_pfn;
 193                 if (end - start >= bootmap_pages) {
 194                         bootmap_start = start;
 195                         break;
 196                 }
 197         }
 198
 199         if (bootmap_start == -1)
 200                 panic("couldn't find a contigous place for the bootmap");
 201
 202         /* Allocate the bootmap and mark the whole MM as reserved.  */
 203         bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
 204                                          node_min_pfn, node_max_pfn);
 205         DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
 206                  bootmap_start, bootmap_size, bootmap_pages);
 207
 208         /* Mark the free regions.  */
 209         for_each_mem_cluster(memdesc, cluster, i) {
 210                 if (cluster->usage & 3)
 211                         continue;
 212
 213                 start = cluster->start_pfn;
 214                 end = cluster->start_pfn + cluster->numpages;
 215
 216                 if (start >= node_max_pfn || end <= node_min_pfn)
 217                         continue;
 218
 219                 if (end > node_max_pfn)
 220                         end = node_max_pfn;
 221                 if (start < node_min_pfn)
 222                         start = node_min_pfn;
 223
 224                 if (start < start_kernel_pfn) {
 225                         if (end > end_kernel_pfn) {
 226                                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
 227                                              (PFN_PHYS(start_kernel_pfn)
 228                                               - PFN_PHYS(start)));
 229                                 printk(" freeing pages %ld:%ld\n",
 230                                        start, start_kernel_pfn);
 231                                 start = end_kernel_pfn;
 232                         } else if (end > start_kernel_pfn)
 233                                 end = start_kernel_pfn;
 234                 } else if (start < end_kernel_pfn)
 235                         start = end_kernel_pfn;
 236                 if (start >= end)
 237                         continue;
 238
 239                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
 240                 printk(" freeing pages %ld:%ld\n", start, end);
 241         }
 242
 243         /* Reserve the bootmap memory.  */
 244         reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start),
 245                         bootmap_size, BOOTMEM_DEFAULT);
 246         printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
 247
 248         node_set_online(nid);
 249 }
 250
 251 void __init
 252 setup_memory(void *kernel_end)
 253 {
 254         int nid;
 255
 256         show_mem_layout();
 257
 258         nodes_clear(node_online_map);
 259
 260         min_low_pfn = ~0UL;
 261         max_low_pfn = 0UL;
 262         for (nid = 0; nid < MAX_NUMNODES; nid++)
 263                 setup_memory_node(nid, kernel_end);
 264
 265 #ifdef CONFIG_BLK_DEV_INITRD
 266         initrd_start = INITRD_START;
 267         if (initrd_start) {
 268                 extern void *move_initrd(unsigned long);
 269
 270                 initrd_end = initrd_start+INITRD_SIZE;
 271                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 272                        (void *) initrd_start, INITRD_SIZE);
 273
 274                 if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
 275                         if (!move_initrd(PFN_PHYS(max_low_pfn)))
 276                                 printk("initrd extends beyond end of memory "
 277                                        "(0x%08lx > 0x%p)\ndisabling initrd\n",
 278                                        initrd_end,
 279                                        phys_to_virt(PFN_PHYS(max_low_pfn)));
 280                 } else {
 281                         nid = kvaddr_to_nid(initrd_start);
 282                         reserve_bootmem_node(NODE_DATA(nid),
 283                                              virt_to_phys((void *)initrd_start),
 284                                              INITRD_SIZE, BOOTMEM_DEFAULT);
 285                 }
 286         }
 287 #endif /* CONFIG_BLK_DEV_INITRD */
 288 }
 289
 290 void __init paging_init(void)
 291 {
 292         unsigned int    nid;
 293         unsigned long   zones_size[MAX_NR_ZONES] = {0, };
 294         unsigned long   dma_local_pfn;
 295
 296         /*
 297          * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
 298          * in the NUMA model, for now we convert it to a pfn and
 299          * we interpret this pfn as a local per-node information.
 300          * This issue isn't very important since none of these machines
 301          * have legacy ISA slots anyways.
 302          */
 303         dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 304
 305         for_each_online_node(nid) {
 306                 bootmem_data_t *bdata = &bootmem_node_data[nid];
 307                 unsigned long start_pfn = bdata->node_min_pfn;
 308                 unsigned long end_pfn = bdata->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, 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 }