xref: /openbmc/linux/arch/sh/mm/numa.c (revision 22246614)
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/mm.h>
13 #include <linux/numa.h>
14 #include <linux/pfn.h>
15 #include <asm/sections.h>
16 
17 static bootmem_data_t plat_node_bdata[MAX_NUMNODES];
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 
31 	/*
32 	 * Node 0 sets up its pgdat at the first available pfn,
33 	 * and bumps it up before setting up the bootmem allocator.
34 	 */
35 	NODE_DATA(0) = pfn_to_kaddr(free_pfn);
36 	memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
37 	free_pfn += PFN_UP(sizeof(struct pglist_data));
38 	NODE_DATA(0)->bdata = &plat_node_bdata[0];
39 
40 	/* Set up node 0 */
41 	setup_bootmem_allocator(free_pfn);
42 
43 	/* Give the platforms a chance to hook up their nodes */
44 	plat_mem_setup();
45 }
46 
47 void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
48 {
49 	unsigned long bootmap_pages, bootmap_start, bootmap_size;
50 	unsigned long start_pfn, free_pfn, end_pfn;
51 
52 	/* Don't allow bogus node assignment */
53 	BUG_ON(nid > MAX_NUMNODES || nid == 0);
54 
55 	/*
56 	 * The free pfn starts at the beginning of the range, and is
57 	 * advanced as necessary for pgdat and node map allocations.
58 	 */
59 	free_pfn = start_pfn = start >> PAGE_SHIFT;
60 	end_pfn = end >> PAGE_SHIFT;
61 
62 	__add_active_range(nid, start_pfn, end_pfn);
63 
64 	/* Node-local pgdat */
65 	NODE_DATA(nid) = pfn_to_kaddr(free_pfn);
66 	free_pfn += PFN_UP(sizeof(struct pglist_data));
67 	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
68 
69 	NODE_DATA(nid)->bdata = &plat_node_bdata[nid];
70 	NODE_DATA(nid)->node_start_pfn = start_pfn;
71 	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
72 
73 	/* Node-local bootmap */
74 	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
75 	bootmap_start = (unsigned long)pfn_to_kaddr(free_pfn);
76 	bootmap_size = init_bootmem_node(NODE_DATA(nid), free_pfn, start_pfn,
77 				    end_pfn);
78 
79 	free_bootmem_with_active_regions(nid, end_pfn);
80 
81 	/* Reserve the pgdat and bootmap space with the bootmem allocator */
82 	reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
83 			     sizeof(struct pglist_data), BOOTMEM_DEFAULT);
84 	reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT,
85 			     bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
86 
87 	/* It's up */
88 	node_set_online(nid);
89 
90 	/* Kick sparsemem */
91 	sparse_memory_present_with_active_regions(nid);
92 }
93