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/arch/sh/mm/numa.c

https://bitbucket.org/ndreys/linux-sunxi
C | 75 lines | 40 code | 14 blank | 21 comment | 1 complexity | fa1067d980e0d9f042c1b1c89b777ae9 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 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/memblock.h>
13#include <linux/mm.h>
14#include <linux/numa.h>
15#include <linux/pfn.h>
16#include <asm/sections.h>
17
18struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
19EXPORT_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 */
27void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
28{
29	unsigned long bootmap_pages;
30	unsigned long start_pfn, end_pfn;
31	unsigned long bootmem_paddr;
32
33	/* Don't allow bogus node assignment */
34	BUG_ON(nid > MAX_NUMNODES || nid <= 0);
35
36	start_pfn = start >> PAGE_SHIFT;
37	end_pfn = end >> PAGE_SHIFT;
38
39	pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
40			 PAGE_KERNEL);
41
42	memblock_add(start, end - start);
43
44	__add_active_range(nid, start_pfn, end_pfn);
45
46	/* Node-local pgdat */
47	NODE_DATA(nid) = __va(memblock_alloc_base(sizeof(struct pglist_data),
48					     SMP_CACHE_BYTES, end));
49	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
50
51	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
52	NODE_DATA(nid)->node_start_pfn = start_pfn;
53	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
54
55	/* Node-local bootmap */
56	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
57	bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
58				       PAGE_SIZE, end);
59	init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
60			  start_pfn, end_pfn);
61
62	free_bootmem_with_active_regions(nid, end_pfn);
63
64	/* Reserve the pgdat and bootmap space with the bootmem allocator */
65	reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
66			     sizeof(struct pglist_data), BOOTMEM_DEFAULT);
67	reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
68			     bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
69
70	/* It's up */
71	node_set_online(nid);
72
73	/* Kick sparsemem */
74	sparse_memory_present_with_active_regions(nid);
75}