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ip27-memory.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2000, 05 by Ralf Baechle (ralf@linux-mips.org)
 * Copyright (C) 2000 by Silicon Graphics, Inc.
 * Copyright (C) 2004 by Christoph Hellwig
 *
 * On SGI IP27 the ARC memory configuration data is completly bogus but
 * alternate easier to use mechanisms are available.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/module.h>
#include <linux/nodemask.h>
#include <linux/swap.h>
#include <linux/bootmem.h>
#include <linux/pfn.h>
#include <linux/highmem.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>

#include <asm/sn/arch.h>
#include <asm/sn/hub.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/sn_private.h>


#define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
#define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)

struct node_data *__node_data[MAX_COMPACT_NODES];

EXPORT_SYMBOL(__node_data);

static int fine_mode;

static int is_fine_dirmode(void)
{
      return (((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_REGIONSIZE_MASK)
              >> NSRI_REGIONSIZE_SHFT) & REGIONSIZE_FINE);
}

static hubreg_t get_region(cnodeid_t cnode)
{
      if (fine_mode)
            return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_FINEREG_SHFT;
      else
            return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_COARSEREG_SHFT;
}

static hubreg_t region_mask;

static void gen_region_mask(hubreg_t *region_mask)
{
      cnodeid_t cnode;

      (*region_mask) = 0;
      for_each_online_node(cnode) {
            (*region_mask) |= 1ULL << get_region(cnode);
      }
}

#define     rou_rflag   rou_flags

static int router_distance;

static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
{
      klrou_t *router;
      lboard_t *brd;
      int   port;

      if (router_a->rou_rflag == 1)
            return;

      if (depth >= router_distance)
            return;

      router_a->rou_rflag = 1;

      for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
            if (router_a->rou_port[port].port_nasid == INVALID_NASID)
                  continue;

            brd = (lboard_t *)NODE_OFFSET_TO_K0(
                  router_a->rou_port[port].port_nasid,
                  router_a->rou_port[port].port_offset);

            if (brd->brd_type == KLTYPE_ROUTER) {
                  router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
                  if (router == router_b) {
                        if (depth < router_distance)
                              router_distance = depth;
                  }
                  else
                        router_recurse(router, router_b, depth + 1);
            }
      }

      router_a->rou_rflag = 0;
}

unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];

static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
{
      klrou_t *router, *router_a = NULL, *router_b = NULL;
      lboard_t *brd, *dest_brd;
      cnodeid_t cnode;
      nasid_t nasid;
      int port;

      /* Figure out which routers nodes in question are connected to */
      for_each_online_node(cnode) {
            nasid = COMPACT_TO_NASID_NODEID(cnode);

            if (nasid == -1) continue;

            brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
                              KLTYPE_ROUTER);

            if (!brd)
                  continue;

            do {
                  if (brd->brd_flags & DUPLICATE_BOARD)
                        continue;

                  router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
                  router->rou_rflag = 0;

                  for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
                        if (router->rou_port[port].port_nasid == INVALID_NASID)
                              continue;

                        dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
                              router->rou_port[port].port_nasid,
                              router->rou_port[port].port_offset);

                        if (dest_brd->brd_type == KLTYPE_IP27) {
                              if (dest_brd->brd_nasid == nasid_a)
                                    router_a = router;
                              if (dest_brd->brd_nasid == nasid_b)
                                    router_b = router;
                        }
                  }

            } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
      }

      if (router_a == NULL) {
            printk("node_distance: router_a NULL\n");
            return -1;
      }
      if (router_b == NULL) {
            printk("node_distance: router_b NULL\n");
            return -1;
      }

      if (nasid_a == nasid_b)
            return 0;

      if (router_a == router_b)
            return 1;

      router_distance = 100;
      router_recurse(router_a, router_b, 2);

      return router_distance;
}

static void __init init_topology_matrix(void)
{
      nasid_t nasid, nasid2;
      cnodeid_t row, col;

      for (row = 0; row < MAX_COMPACT_NODES; row++)
            for (col = 0; col < MAX_COMPACT_NODES; col++)
                  __node_distances[row][col] = -1;

      for_each_online_node(row) {
            nasid = COMPACT_TO_NASID_NODEID(row);
            for_each_online_node(col) {
                  nasid2 = COMPACT_TO_NASID_NODEID(col);
                  __node_distances[row][col] =
                        compute_node_distance(nasid, nasid2);
            }
      }
}

static void __init dump_topology(void)
{
      nasid_t nasid;
      cnodeid_t cnode;
      lboard_t *brd, *dest_brd;
      int port;
      int router_num = 0;
      klrou_t *router;
      cnodeid_t row, col;

      printk("************** Topology ********************\n");

      printk("    ");
      for_each_online_node(col)
            printk("%02d ", col);
      printk("\n");
      for_each_online_node(row) {
            printk("%02d  ", row);
            for_each_online_node(col)
                  printk("%2d ", node_distance(row, col));
            printk("\n");
      }

      for_each_online_node(cnode) {
            nasid = COMPACT_TO_NASID_NODEID(cnode);

            if (nasid == -1) continue;

            brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
                              KLTYPE_ROUTER);

            if (!brd)
                  continue;

            do {
                  if (brd->brd_flags & DUPLICATE_BOARD)
                        continue;
                  printk("Router %d:", router_num);
                  router_num++;

                  router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);

                  for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
                        if (router->rou_port[port].port_nasid == INVALID_NASID)
                              continue;

                        dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
                              router->rou_port[port].port_nasid,
                              router->rou_port[port].port_offset);

                        if (dest_brd->brd_type == KLTYPE_IP27)
                              printk(" %d", dest_brd->brd_nasid);
                        if (dest_brd->brd_type == KLTYPE_ROUTER)
                              printk(" r");
                  }
                  printk("\n");

            } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
      }
}

static pfn_t __init slot_getbasepfn(cnodeid_t cnode, int slot)
{
      nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);

      return ((pfn_t)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
}

static pfn_t __init slot_psize_compute(cnodeid_t node, int slot)
{
      nasid_t nasid;
      lboard_t *brd;
      klmembnk_t *banks;
      unsigned long size;

      nasid = COMPACT_TO_NASID_NODEID(node);
      /* Find the node board */
      brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
      if (!brd)
            return 0;

      /* Get the memory bank structure */
      banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
      if (!banks)
            return 0;

      /* Size in _Megabytes_ */
      size = (unsigned long)banks->membnk_bnksz[slot/4];

      /* hack for 128 dimm banks */
      if (size <= 128) {
            if (slot % 4 == 0) {
                  size <<= 20;            /* size in bytes */
                  return(size >> PAGE_SHIFT);
            } else
                  return 0;
      } else {
            size /= 4;
            size <<= 20;
            return size >> PAGE_SHIFT;
      }
}

static void __init mlreset(void)
{
      int i;

      master_nasid = get_nasid();
      fine_mode = is_fine_dirmode();

      /*
       * Probe for all CPUs - this creates the cpumask and sets up the
       * mapping tables.  We need to do this as early as possible.
       */
#ifdef CONFIG_SMP
      cpu_node_probe();
#endif

      init_topology_matrix();
      dump_topology();

      gen_region_mask(&region_mask);

      setup_replication_mask();

      /*
       * Set all nodes' calias sizes to 8k
       */
      for_each_online_node(i) {
            nasid_t nasid;

            nasid = COMPACT_TO_NASID_NODEID(i);

            /*
             * Always have node 0 in the region mask, otherwise
             * CALIAS accesses get exceptions since the hub
             * thinks it is a node 0 address.
             */
            REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
#ifdef CONFIG_REPLICATE_EXHANDLERS
            REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
#else
            REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
#endif

#ifdef LATER
            /*
             * Set up all hubs to have a big window pointing at
             * widget 0. Memory mode, widget 0, offset 0
             */
            REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
                  ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
                  (0 << IIO_ITTE_WIDGET_SHIFT)));
#endif
      }
}

static void __init szmem(void)
{
      pfn_t slot_psize, slot0sz = 0, nodebytes; /* Hack to detect problem configs */
      int slot;
      cnodeid_t node;

      num_physpages = 0;

      for_each_online_node(node) {
            nodebytes = 0;
            for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
                  slot_psize = slot_psize_compute(node, slot);
                  if (slot == 0)
                        slot0sz = slot_psize;
                  /*
                   * We need to refine the hack when we have replicated
                   * kernel text.
                   */
                  nodebytes += (1LL << SLOT_SHIFT);

                  if (!slot_psize)
                        continue;

                  if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
                                    (slot0sz << PAGE_SHIFT)) {
                        printk("Ignoring slot %d onwards on node %d\n",
                                                slot, node);
                        slot = MAX_MEM_SLOTS;
                        continue;
                  }
                  num_physpages += slot_psize;
                  add_active_range(node, slot_getbasepfn(node, slot),
                               slot_getbasepfn(node, slot) + slot_psize);
            }
      }
}

static void __init node_mem_init(cnodeid_t node)
{
      pfn_t slot_firstpfn = slot_getbasepfn(node, 0);
      pfn_t slot_freepfn = node_getfirstfree(node);
      unsigned long bootmap_size;
      pfn_t start_pfn, end_pfn;

      get_pfn_range_for_nid(node, &start_pfn, &end_pfn);

      /*
       * Allocate the node data structures on the node first.
       */
      __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);

      NODE_DATA(node)->bdata = &bootmem_node_data[node];
      NODE_DATA(node)->node_start_pfn = start_pfn;
      NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;

      cpus_clear(hub_data(node)->h_cpus);

      slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
                         sizeof(struct hub_data));

      bootmap_size = init_bootmem_node(NODE_DATA(node), slot_freepfn,
                              start_pfn, end_pfn);
      free_bootmem_with_active_regions(node, end_pfn);
      reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
            ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size,
            BOOTMEM_DEFAULT);
      sparse_memory_present_with_active_regions(node);
}

/*
 * A node with nothing.  We use it to avoid any special casing in
 * node_to_cpumask
 */
static struct node_data null_node = {
      .hub = {
            .h_cpus = CPU_MASK_NONE
      }
};

/*
 * Currently, the intranode memory hole support assumes that each slot
 * contains at least 32 MBytes of memory. We assume all bootmem data
 * fits on the first slot.
 */
void __init prom_meminit(void)
{
      cnodeid_t node;

      mlreset();
      szmem();

      for (node = 0; node < MAX_COMPACT_NODES; node++) {
            if (node_online(node)) {
                  node_mem_init(node);
                  continue;
            }
            __node_data[node] = &null_node;
      }
}

void __init prom_free_prom_memory(void)
{
      /* We got nothing to free here ...  */
}

extern unsigned long setup_zero_pages(void);

void __init paging_init(void)
{
      unsigned long zones_size[MAX_NR_ZONES] = {0, };
      unsigned node;

      pagetable_init();

      for_each_online_node(node) {
            pfn_t start_pfn, end_pfn;

            get_pfn_range_for_nid(node, &start_pfn, &end_pfn);

            if (end_pfn > max_low_pfn)
                  max_low_pfn = end_pfn;
      }
      zones_size[ZONE_NORMAL] = max_low_pfn;
      free_area_init_nodes(zones_size);
}

void __init mem_init(void)
{
      unsigned long codesize, datasize, initsize, tmp;
      unsigned node;

      high_memory = (void *) __va(num_physpages << PAGE_SHIFT);

      for_each_online_node(node) {
            /*
             * This will free up the bootmem, ie, slot 0 memory.
             */
            totalram_pages += free_all_bootmem_node(NODE_DATA(node));
      }

      totalram_pages -= setup_zero_pages();     /* This comes from node 0 */

      codesize =  (unsigned long) &_etext - (unsigned long) &_text;
      datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
      initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;

      tmp = nr_free_pages();
      printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
             "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
             tmp << (PAGE_SHIFT-10),
             num_physpages << (PAGE_SHIFT-10),
             codesize >> 10,
             (num_physpages - tmp) << (PAGE_SHIFT-10),
             datasize >> 10,
             initsize >> 10,
             (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
}

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