summaryrefslogtreecommitdiffstats
path: root/arch/x86/mm/memblock.c
blob: 992da5ec5a64d69ddc3381d9e8508e4d6061d4ef (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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
#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>

/* Check for already reserved areas */
bool __init memblock_x86_check_reserved_size(u64 *addrp, u64 *sizep, u64 align)
{
	struct memblock_region *r;
	u64 addr = *addrp, last;
	u64 size = *sizep;
	bool changed = false;

again:
	last = addr + size;
	for_each_memblock(reserved, r) {
		if (last > r->base && addr < r->base) {
			size = r->base - addr;
			changed = true;
			goto again;
		}
		if (last > (r->base + r->size) && addr < (r->base + r->size)) {
			addr = round_up(r->base + r->size, align);
			size = last - addr;
			changed = true;
			goto again;
		}
		if (last <= (r->base + r->size) && addr >= r->base) {
			*sizep = 0;
			return false;
		}
	}
	if (changed) {
		*addrp = addr;
		*sizep = size;
	}
	return changed;
}

/*
 * Find next free range after start, and size is returned in *sizep
 */
u64 __init memblock_x86_find_in_range_size(u64 start, u64 *sizep, u64 align)
{
	struct memblock_region *r;

	for_each_memblock(memory, r) {
		u64 ei_start = r->base;
		u64 ei_last = ei_start + r->size;
		u64 addr;

		addr = round_up(ei_start, align);
		if (addr < start)
			addr = round_up(start, align);
		if (addr >= ei_last)
			continue;
		*sizep = ei_last - addr;
		while (memblock_x86_check_reserved_size(&addr, sizep, align))
			;

		if (*sizep)
			return addr;
	}

	return MEMBLOCK_ERROR;
}

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 == MEMBLOCK_ERROR)
		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();
}

struct count_data {
	int nr;
};

static int __init count_work_fn(unsigned long start_pfn,
				unsigned long end_pfn, void *datax)
{
	struct count_data *data = datax;

	data->nr++;

	return 0;
}

static int __init count_early_node_map(int nodeid)
{
	struct count_data data;

	data.nr = 0;
	work_with_active_regions(nodeid, count_work_fn, &data);

	return data.nr;
}

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;
}

int __init get_free_all_memory_range(struct range **rangep, int nodeid)
{
	unsigned long end_pfn = -1UL;

#ifdef CONFIG_X86_32
	end_pfn = max_low_pfn;
#endif
	return __get_free_all_memory_range(rangep, nodeid, 0, end_pfn);
}

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);
}

/*
 * Need to call this function after memblock_x86_register_active_regions,
 * so early_node_map[] is filled already.
 */
u64 __init memblock_x86_find_in_range_node(int nid, u64 start, u64 end, u64 size, u64 align)
{
	u64 addr;
	addr = find_memory_core_early(nid, size, align, start, end);
	if (addr != MEMBLOCK_ERROR)
		return addr;

	/* Fallback, should already have start end within node range */
	return memblock_find_in_range(start, end, size, align);
}

/*
 * 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;
}

/* Walk the memblock.memory map and register active regions within a node */
void __init memblock_x86_register_active_regions(int nid, unsigned long start_pfn,
					 unsigned long last_pfn)
{
	unsigned long ei_startpfn;
	unsigned long ei_endpfn;
	struct memblock_region *r;

	for_each_memblock(memory, r)
		if (memblock_x86_find_active_region(r, start_pfn, last_pfn,
					   &ei_startpfn, &ei_endpfn))
			add_active_range(nid, ei_startpfn, ei_endpfn);
}

/*
 * 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