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 #include <asm/sections.h>
  21
  22 pg_data_t node_data[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 #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 = &bootmem_node_data[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 contiguous 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),
 244                         bootmap_size, BOOTMEM_DEFAULT);
 245         printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
 246
 247         node_set_online(nid);
 248 }
 249
 250 void __init
 251 setup_memory(void *kernel_end)
 252 {
 253         int nid;
 254
 255         show_mem_layout();
 256
 257         nodes_clear(node_online_map);
 258
 259         min_low_pfn = ~0UL;
 260         max_low_pfn = 0UL;
 261         for (nid = 0; nid < MAX_NUMNODES; nid++)
 262                 setup_memory_node(nid, kernel_end);
 263
 264 #ifdef CONFIG_BLK_DEV_INITRD
 265         initrd_start = INITRD_START;
 266         if (initrd_start) {
 267                 extern void *move_initrd(unsigned long);
 268
 269                 initrd_end = initrd_start+INITRD_SIZE;
 270                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 271                        (void *) initrd_start, INITRD_SIZE);
 272
 273                 if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
 274                         if (!move_initrd(PFN_PHYS(max_low_pfn)))
 275                                 printk("initrd extends beyond end of memory "
 276                                        "(0x%08lx > 0x%p)\ndisabling initrd\n",
 277                                        initrd_end,
 278                                        phys_to_virt(PFN_PHYS(max_low_pfn)));
 279                 } else {
 280                         nid = kvaddr_to_nid(initrd_start);
 281                         reserve_bootmem_node(NODE_DATA(nid),
 282                                              virt_to_phys((void *)initrd_start),
 283                                              INITRD_SIZE, BOOTMEM_DEFAULT);
 284                 }
 285         }
 286 #endif /* CONFIG_BLK_DEV_INITRD */
 287 }
 288
 289 void __init paging_init(void)
 290 {
 291         unsigned int    nid;
 292         unsigned long   zones_size[MAX_NR_ZONES] = {0, };
 293         unsigned long   dma_local_pfn;
 294
 295         /*
 296          * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
 297          * in the NUMA model, for now we convert it to a pfn and
 298          * we interpret this pfn as a local per-node information.
 299          * This issue isn't very important since none of these machines
 300          * have legacy ISA slots anyways.
 301          */
 302         dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 303
 304         for_each_online_node(nid) {
 305                 bootmem_data_t *bdata = &bootmem_node_data[nid];
 306                 unsigned long start_pfn = bdata->node_min_pfn;
 307                 unsigned long end_pfn = bdata->node_low_pfn;
 308
 309                 if (dma_local_pfn >= end_pfn - start_pfn)
 310                         zones_size[ZONE_DMA] = end_pfn - start_pfn;
 311                 else {
 312                         zones_size[ZONE_DMA] = dma_local_pfn;
 313                         zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
 314                 }
 315                 node_set_state(nid, N_NORMAL_MEMORY);
 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 }