summaryrefslogtreecommitdiffstats
path: root/arch/x86/mm/memblock.c
blob: 0e8442a9baff39b7311ea64a264b1060c4fbef9e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/range.h>

static __init struct range *find_range_array(int count)
{
	u64 end, size, mem;
	struct range *range;

	size = sizeof(struct range) * count;
	end = memblock.current_limit;

	mem = memblock_find_in_range(0, end, size, sizeof(struct range));
	if (!mem)
		panic("can not find more space for range array");

	/*
	 * This range is tempoaray, so don't reserve it, it will not be
	 * overlapped because We will not alloccate new buffer before
	 * We discard this one
	 */
	range = __va(mem);
	memset(range, 0, size);

	return range;
}

static void __init memblock_x86_subtract_reserved(struct range *range, int az)
{
	u64 final_start, final_end;
	struct memblock_region *r;

	/* Take out region array itself at first*/
	memblock_free_reserved_regions();

	memblock_dbg("Subtract (%ld early reservations)\n", memblock.reserved.cnt);

	for_each_memblock(reserved, r) {
		memblock_dbg("  [%010llx-%010llx]\n", (u64)r->base, (u64)r->base + r->size - 1);
		final_start = PFN_DOWN(r->base);
		final_end = PFN_UP(r->base + r->size);
		if (final_start >= final_end)
			continue;
		subtract_range(range, az, final_start, final_end);
	}

	/* Put region array back ? */
	memblock_reserve_reserved_regions();
}

static int __init count_early_node_map(int nodeid)
{
	int i, cnt = 0;

	for_each_mem_pfn_range(i, nodeid, NULL, NULL, NULL)
		cnt++;
	return cnt;
}

int __init __get_free_all_memory_range(struct range **rangep, int nodeid,
			 unsigned long start_pfn, unsigned long end_pfn)
{
	int count;
	struct range *range;
	int nr_range;

	count = (memblock.reserved.cnt + count_early_node_map(nodeid)) * 2;

	range = find_range_array(count);
	nr_range = 0;

	/*
	 * Use early_node_map[] and memblock.reserved.region to get range array
	 * at first
	 */
	nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
	subtract_range(range, count, 0, start_pfn);
	subtract_range(range, count, end_pfn, -1ULL);

	memblock_x86_subtract_reserved(range, count);
	nr_range = clean_sort_range(range, count);

	*rangep = range;
	return nr_range;
}

static u64 __init __memblock_x86_memory_in_range(u64 addr, u64 limit, bool get_free)
{
	int i, count;
	struct range *range;
	int nr_range;
	u64 final_start, final_end;
	u64 free_size;
	struct memblock_region *r;

	count = (memblock.reserved.cnt + memblock.memory.cnt) * 2;

	range = find_range_array(count);
	nr_range = 0;

	addr = PFN_UP(addr);
	limit = PFN_DOWN(limit);

	for_each_memblock(memory, r) {
		final_start = PFN_UP(r->base);
		final_end = PFN_DOWN(r->base + r->size);
		if (final_start >= final_end)
			continue;
		if (final_start >= limit || final_end <= addr)
			continue;

		nr_range = add_range(range, count, nr_range, final_start, final_end);
	}
	subtract_range(range, count, 0, addr);
	subtract_range(range, count, limit, -1ULL);

	/* Subtract memblock.reserved.region in range ? */
	if (!get_free)
		goto sort_and_count_them;
	for_each_memblock(reserved, r) {
		final_start = PFN_DOWN(r->base);
		final_end = PFN_UP(r->base + r->size);
		if (final_start >= final_end)
			continue;
		if (final_start >= limit || final_end <= addr)
			continue;

		subtract_range(range, count, final_start, final_end);
	}

sort_and_count_them:
	nr_range = clean_sort_range(range, count);

	free_size = 0;
	for (i = 0; i < nr_range; i++)
		free_size += range[i].end - range[i].start;

	return free_size << PAGE_SHIFT;
}

u64 __init memblock_x86_free_memory_in_range(u64 addr, u64 limit)
{
	return __memblock_x86_memory_in_range(addr, limit, true);
}

u64 __init memblock_x86_memory_in_range(u64 addr, u64 limit)
{
	return __memblock_x86_memory_in_range(addr, limit, false);
}

void __init memblock_x86_reserve_range(u64 start, u64 end, char *name)
{
	if (start == end)
		return;

	if (WARN_ONCE(start > end, "memblock_x86_reserve_range: wrong range [%#llx, %#llx)\n", start, end))
		return;

	memblock_dbg("    memblock_x86_reserve_range: [%#010llx-%#010llx] %16s\n", start, end - 1, name);

	memblock_reserve(start, end - start);
}

void __init memblock_x86_free_range(u64 start, u64 end)
{
	if (start == end)
		return;

	if (WARN_ONCE(start > end, "memblock_x86_free_range: wrong range [%#llx, %#llx)\n", start, end))
		return;

	memblock_dbg("       memblock_x86_free_range: [%#010llx-%#010llx]\n", start, end - 1);

	memblock_free(start, end - start);
}

/*
 * Finds an active region in the address range from start_pfn to last_pfn and
 * returns its range in ei_startpfn and ei_endpfn for the memblock entry.
 */
static int __init memblock_x86_find_active_region(const struct memblock_region *ei,
				  unsigned long start_pfn,
				  unsigned long last_pfn,
				  unsigned long *ei_startpfn,
				  unsigned long *ei_endpfn)
{
	u64 align = PAGE_SIZE;

	*ei_startpfn = round_up(ei->base, align) >> PAGE_SHIFT;
	*ei_endpfn = round_down(ei->base + ei->size, align) >> PAGE_SHIFT;

	/* Skip map entries smaller than a page */
	if (*ei_startpfn >= *ei_endpfn)
		return 0;

	/* Skip if map is outside the node */
	if (*ei_endpfn <= start_pfn || *ei_startpfn >= last_pfn)
		return 0;

	/* Check for overlaps */
	if (*ei_startpfn < start_pfn)
		*ei_startpfn = start_pfn;
	if (*ei_endpfn > last_pfn)
		*ei_endpfn = last_pfn;

	return 1;
}

/*
 * Find the hole size (in bytes) in the memory range.
 * @start: starting address of the memory range to scan
 * @end: ending address of the memory range to scan
 */
u64 __init memblock_x86_hole_size(u64 start, u64 end)
{
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long last_pfn = end >> PAGE_SHIFT;
	unsigned long ei_startpfn, ei_endpfn, ram = 0;
	struct memblock_region *r;

	for_each_memblock(memory, r)
		if (memblock_x86_find_active_region(r, start_pfn, last_pfn,
					   &ei_startpfn, &ei_endpfn))
			ram += ei_endpfn - ei_startpfn;

	return end - start - ((u64)ram << PAGE_SHIFT);
}
OpenPOWER on IntegriCloud