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numa.c

/*
 * arch/sh/mm/numa.c - Multiple node support for SH machines
 *
 *  Copyright (C) 2007  Paul Mundt
 *
 * 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.
 */
#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/numa.h>
#include <linux/pfn.h>
#include <asm/sections.h>

static bootmem_data_t plat_node_bdata[MAX_NUMNODES];
struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL_GPL(node_data);

/*
 * On SH machines the conventional approach is to stash system RAM
 * in node 0, and other memory blocks in to node 1 and up, ordered by
 * latency. Each node's pgdat is node-local at the beginning of the node,
 * immediately followed by the node mem map.
 */
void __init setup_memory(void)
{
      unsigned long free_pfn = PFN_UP(__pa(_end));

      /*
       * Node 0 sets up its pgdat at the first available pfn,
       * and bumps it up before setting up the bootmem allocator.
       */
      NODE_DATA(0) = pfn_to_kaddr(free_pfn);
      memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
      free_pfn += PFN_UP(sizeof(struct pglist_data));
      NODE_DATA(0)->bdata = &plat_node_bdata[0];

      /* Set up node 0 */
      setup_bootmem_allocator(free_pfn);

      /* Give the platforms a chance to hook up their nodes */
      plat_mem_setup();
}

void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
{
      unsigned long bootmap_pages, bootmap_start, bootmap_size;
      unsigned long start_pfn, free_pfn, end_pfn;

      /* Don't allow bogus node assignment */
      BUG_ON(nid > MAX_NUMNODES || nid == 0);

      /*
       * The free pfn starts at the beginning of the range, and is
       * advanced as necessary for pgdat and node map allocations.
       */
      free_pfn = start_pfn = start >> PAGE_SHIFT;
      end_pfn = end >> PAGE_SHIFT;

      add_active_range(nid, start_pfn, end_pfn);

      /* Node-local pgdat */
      NODE_DATA(nid) = pfn_to_kaddr(free_pfn);
      free_pfn += PFN_UP(sizeof(struct pglist_data));
      memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));

      NODE_DATA(nid)->bdata = &plat_node_bdata[nid];
      NODE_DATA(nid)->node_start_pfn = start_pfn;
      NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;

      /* Node-local bootmap */
      bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
      bootmap_start = (unsigned long)pfn_to_kaddr(free_pfn);
      bootmap_size = init_bootmem_node(NODE_DATA(nid), free_pfn, start_pfn,
                            end_pfn);

      free_bootmem_with_active_regions(nid, end_pfn);

      /* Reserve the pgdat and bootmap space with the bootmem allocator */
      reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
                       sizeof(struct pglist_data));
      reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT,
                       bootmap_pages << PAGE_SHIFT);

      /* It's up */
      node_set_online(nid);

      /* Kick sparsemem */
      sparse_memory_present_with_active_regions(nid);
}

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