arch/sh/mm/numa.c

   1 /*
   2  * arch/sh/mm/numa.c - Multiple node support for SH machines
   3  *
   4  *  Copyright (C) 2007  Paul Mundt
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10 #include <linux/module.h>
  11 #include <linux/bootmem.h>
  12 #include <linux/lmb.h>
  13 #include <linux/mm.h>
  14 #include <linux/numa.h>
  15 #include <linux/pfn.h>
  16 #include <asm/sections.h>
  17
  18 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  19 EXPORT_SYMBOL_GPL(node_data);
  20
  21 /*
  22  * On SH machines the conventional approach is to stash system RAM
  23  * in node 0, and other memory blocks in to node 1 and up, ordered by
  24  * latency. Each node's pgdat is node-local at the beginning of the node,
  25  * immediately followed by the node mem map.
  26  */
  27 void __init setup_memory(void)
  28 {
  29         unsigned long free_pfn = PFN_UP(__pa(_end));
  30         u64 base = min_low_pfn << PAGE_SHIFT;
  31         u64 size = (max_low_pfn << PAGE_SHIFT) - min_low_pfn;
  32
  33         lmb_add(base, size);
  34
  35         /* Reserve the LMB regions used by the kernel, initrd, etc.. */
  36         lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
  37                     (PFN_PHYS(free_pfn) + PAGE_SIZE - 1) -
  38                     (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
  39
  40         /*
  41          * Node 0 sets up its pgdat at the first available pfn,
  42          * and bumps it up before setting up the bootmem allocator.
  43          */
  44         NODE_DATA(0) = pfn_to_kaddr(free_pfn);
  45         memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
  46         free_pfn += PFN_UP(sizeof(struct pglist_data));
  47         NODE_DATA(0)->bdata = &bootmem_node_data[0];
  48
  49         /* Set up node 0 */
  50         setup_bootmem_allocator(free_pfn);
  51
  52         /* Give the platforms a chance to hook up their nodes */
  53         plat_mem_setup();
  54 }
  55
  56 void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
  57 {
  58         unsigned long bootmap_pages;
  59         unsigned long start_pfn, end_pfn;
  60         unsigned long bootmem_paddr;
  61
  62         /* Don't allow bogus node assignment */
  63         BUG_ON(nid > MAX_NUMNODES || nid == 0);
  64
  65         start_pfn = start >> PAGE_SHIFT;
  66         end_pfn = end >> PAGE_SHIFT;
  67
  68         lmb_add(start, end - start);
  69
  70         __add_active_range(nid, start_pfn, end_pfn);
  71
  72         /* Node-local pgdat */
  73         NODE_DATA(nid) = __va(lmb_alloc_base(sizeof(struct pglist_data),
  74                                              SMP_CACHE_BYTES, end_pfn));
  75         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
  76
  77         NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
  78         NODE_DATA(nid)->node_start_pfn = start_pfn;
  79         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
  80
  81         /* Node-local bootmap */
  82         bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
  83         bootmem_paddr = lmb_alloc_base(bootmap_pages << PAGE_SHIFT,
  84                                        PAGE_SIZE, end_pfn);
  85         init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
  86                           start_pfn, end_pfn);
  87
  88         free_bootmem_with_active_regions(nid, end_pfn);
  89
  90         /* Reserve the pgdat and bootmap space with the bootmem allocator */
  91         reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
  92                              sizeof(struct pglist_data), BOOTMEM_DEFAULT);
  93         reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
  94                              bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
  95
  96         /* It's up */
  97         node_set_online(nid);
  98
  99         /* Kick sparsemem */
 100         sparse_memory_present_with_active_regions(nid);
 101 }