Release 4.17 mm/nobootmem.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  bootmem - A boot-time physical memory allocator and configurator
 *
 *  Copyright (C) 1999 Ingo Molnar
 *                1999 Kanoj Sarcar, SGI
 *                2008 Johannes Weiner
 *
 * Access to this subsystem has to be serialized externally (which is true
 * for the boot process anyway).
 */
#include <linux/init.h>
#include <linux/pfn.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/kmemleak.h>
#include <linux/range.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>

#include <asm/bug.h>
#include <asm/io.h>

#include "internal.h"

#ifndef CONFIG_HAVE_MEMBLOCK
#error CONFIG_HAVE_MEMBLOCK not defined
#endif

#ifndef CONFIG_NEED_MULTIPLE_NODES

struct pglist_data __refdata contig_page_data;
EXPORT_SYMBOL(contig_page_data);
#endif


unsigned long max_low_pfn;

unsigned long min_low_pfn;

unsigned long max_pfn;

unsigned long long max_possible_pfn;



static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
					u64 goal, u64 limit)
{
	void *ptr;
	u64 addr;
	ulong flags = choose_memblock_flags();

	if (limit > memblock.current_limit)
		limit = memblock.current_limit;

again:
	addr = memblock_find_in_range_node(size, align, goal, limit, nid,
					   flags);
	if (!addr && (flags & MEMBLOCK_MIRROR)) {
		flags &= ~MEMBLOCK_MIRROR;
		pr_warn("Could not allocate %pap bytes of mirrored memory\n",
			&size);
		goto again;
	}
	if (!addr)
		return NULL;

	if (memblock_reserve(addr, size))
		return NULL;

	ptr = phys_to_virt(addr);
	memset(ptr, 0, size);
	/*
         * The min_count is set to 0 so that bootmem allocated blocks
         * are never reported as leaks.
         */
	kmemleak_alloc(ptr, size, 0, 0);
	return ptr;
}

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Yinghai Lu
91
61.07%
1
12.50%
Tony Luck
39
26.17%
2
25.00%
JoonSoo Kim
6
4.03%
1
12.50%
Philipp Hachtmann
6
4.03%
1
12.50%
Grygorii Strashko
4
2.68%
1
12.50%
Tejun Heo
3
2.01%
2
25.00%
Total
149
100.00%
8
100.00%

/*
 * free_bootmem_late - free bootmem pages directly to page allocator
 * @addr: starting address of the range
 * @size: size of the range in bytes
 *
 * This is only useful when the bootmem allocator has already been torn
 * down, but we are still initializing the system.  Pages are given directly
 * to the page allocator, no bootmem metadata is updated because it is gone.
 */


void __init free_bootmem_late(unsigned long addr, unsigned long size)
{
	unsigned long cursor, end;

	kmemleak_free_part_phys(addr, size);

	cursor = PFN_UP(addr);
	end = PFN_DOWN(addr + size);

	for (; cursor < end; cursor++) {
		__free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
		totalram_pages++;
	}
}

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Yinghai Lu
67
95.71%
1
33.33%
Mel Gorman
2
2.86%
1
33.33%
Catalin Marinas
1
1.43%
1
33.33%
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70
100.00%
3
100.00%



static void __init __free_pages_memory(unsigned long start, unsigned long end)
{
	int order;

	while (start < end) {
		order = min(MAX_ORDER - 1UL, __ffs(start));

		while (start + (1UL << order) > end)
			order--;

		__free_pages_bootmem(pfn_to_page(start), start, order);

		start += (1UL << order);
	}
}

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Yinghai Lu
40
53.33%
1
33.33%
Robin Holt
33
44.00%
1
33.33%
Mel Gorman
2
2.67%
1
33.33%
Total
75
100.00%
3
100.00%



static unsigned long __init __free_memory_core(phys_addr_t start,
				 phys_addr_t end)
{
	unsigned long start_pfn = PFN_UP(start);
	unsigned long end_pfn = min_t(unsigned long,
				      PFN_DOWN(end), max_low_pfn);

	if (start_pfn >= end_pfn)
		return 0;

	__free_pages_memory(start_pfn, end_pfn);

	return end_pfn - start_pfn;
}

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Yinghai Lu
56
98.25%
1
50.00%
Wei Yang
1
1.75%
1
50.00%
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57
100.00%
2
100.00%



static unsigned long __init free_low_memory_core_early(void)
{
	unsigned long count = 0;
	phys_addr_t start, end;
	u64 i;

	memblock_clear_hotplug(0, -1);

	for_each_reserved_mem_region(i, &start, &end)
		reserve_bootmem_region(start, end);

	/*
         * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
         *  because in some case like Node0 doesn't have RAM installed
         *  low ram will be on Node1
         */
	for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
				NULL)
		count += __free_memory_core(start, end);

	return count;
}

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Tejun Heo
24
32.43%
2
20.00%
Yinghai Lu
21
28.38%
2
20.00%
Nathan Zimmer
15
20.27%
1
10.00%
Xishi Qiu
8
10.81%
1
10.00%
JoonSoo Kim
2
2.70%
1
10.00%
Tony Luck
2
2.70%
1
10.00%
Grygorii Strashko
1
1.35%
1
10.00%
Wanlong Gao
1
1.35%
1
10.00%
Total
74
100.00%
10
100.00%


static int reset_managed_pages_done __initdata;



void reset_node_managed_pages(pg_data_t *pgdat)
{
	struct zone *z;

	for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
		z->managed_pages = 0;
}

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Jiang Liu
39
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2
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39
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void __init reset_all_zones_managed_pages(void)
{
	struct pglist_data *pgdat;

	if (reset_managed_pages_done)
		return;

	for_each_online_pgdat(pgdat)
		reset_node_managed_pages(pgdat);

	reset_managed_pages_done = 1;
}

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Jiang Liu
21
67.74%
2
50.00%
Yinghai Lu
5
16.13%
1
25.00%
Tang Chen
5
16.13%
1
25.00%
Total
31
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4
100.00%

/**
 * free_all_bootmem - release free pages to the buddy allocator
 *
 * Returns the number of pages actually released.
 */


unsigned long __init free_all_bootmem(void)
{
	unsigned long pages;

	reset_all_zones_managed_pages();

	pages = free_low_memory_core_early();
	totalram_pages += pages;

	return pages;
}

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Jiang Liu
24
85.71%
2
40.00%
Yinghai Lu
2
7.14%
1
20.00%
Tejun Heo
1
3.57%
1
20.00%
JoonSoo Kim
1
3.57%
1
20.00%
Total
28
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5
100.00%

/**
 * free_bootmem_node - mark a page range as usable
 * @pgdat: node the range resides on
 * @physaddr: starting address of the range
 * @size: size of the range in bytes
 *
 * Partial pages will be considered reserved and left as they are.
 *
 * The range must reside completely on the specified node.
 */


void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
			      unsigned long size)
{
	memblock_free(physaddr, size);
}

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Yinghai Lu
24
96.00%
1
50.00%
Tejun Heo
1
4.00%
1
50.00%
Total
25
100.00%
2
100.00%

/**
 * free_bootmem - mark a page range as usable
 * @addr: starting address of the range
 * @size: size of the range in bytes
 *
 * Partial pages will be considered reserved and left as they are.
 *
 * The range must be contiguous but may span node boundaries.
 */


void __init free_bootmem(unsigned long addr, unsigned long size)
{
	memblock_free(addr, size);
}

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Yinghai Lu
20
95.24%
1
50.00%
Tejun Heo
1
4.76%
1
50.00%
Total
21
100.00%
2
100.00%



static void * __init ___alloc_bootmem_nopanic(unsigned long size,
					unsigned long align,
					unsigned long goal,
					unsigned long limit)
{
	void *ptr;

	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc(size, GFP_NOWAIT);

restart:

	ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);

	if (ptr)
		return ptr;

	if (goal != 0) {
		goal = 0;
		goto restart;
	}

	return NULL;
}

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Yinghai Lu
85
98.84%
1
50.00%
Grygorii Strashko
1
1.16%
1
50.00%
Total
86
100.00%
2
100.00%

/**
 * __alloc_bootmem_nopanic - allocate boot memory without panicking
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may happen on any node in the system.
 *
 * Returns NULL on failure.
 */


void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
					unsigned long goal)
{
	unsigned long limit = -1UL;

	return ___alloc_bootmem_nopanic(size, align, goal, limit);
}

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Yinghai Lu
38
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1
100.00%
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38
100.00%
1
100.00%



static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
					unsigned long goal, unsigned long limit)
{
	void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);

	if (mem)
		return mem;
	/*
         * Whoops, we cannot satisfy the allocation request.
         */
	pr_alert("bootmem alloc of %lu bytes failed!\n", size);
	panic("Out of memory");
	return NULL;
}

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Yinghai Lu
61
98.39%
1
50.00%
Joe Perches
1
1.61%
1
50.00%
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62
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2
100.00%

/**
 * __alloc_bootmem - allocate boot memory
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may happen on any node in the system.
 *
 * The function panics if the request can not be satisfied.
 */


void * __init __alloc_bootmem(unsigned long size, unsigned long align,
			      unsigned long goal)
{
	unsigned long limit = -1UL;

	return ___alloc_bootmem(size, align, goal, limit);
}

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Yinghai Lu
38
100.00%
1
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38
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1
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void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
						   unsigned long size,
						   unsigned long align,
						   unsigned long goal,
						   unsigned long limit)
{
	void *ptr;

again:
	ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
					goal, limit);
	if (ptr)
		return ptr;

	ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
					goal, limit);
	if (ptr)
		return ptr;

	if (goal) {
		goal = 0;
		goto again;
	}

	return NULL;
}

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Yinghai Lu
58
61.05%
1
20.00%
David S. Miller
19
20.00%
1
20.00%
Johannes Weiner
17
17.89%
2
40.00%
Grygorii Strashko
1
1.05%
1
20.00%
Total
95
100.00%
5
100.00%



void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
				   unsigned long align, unsigned long goal)
{
	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
}

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Johannes Weiner
57
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57
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static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
				    unsigned long align, unsigned long goal,
				    unsigned long limit)
{
	void *ptr;

	ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
	if (ptr)
		return ptr;

	pr_alert("bootmem alloc of %lu bytes failed!\n", size);
	panic("Out of memory");
	return NULL;
}

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Johannes Weiner
64
92.75%
2
33.33%
Yinghai Lu
2
2.90%
1
16.67%
David S. Miller
1
1.45%
1
16.67%
Rashika Kheria
1
1.45%
1
16.67%
Joe Perches
1
1.45%
1
16.67%
Total
69
100.00%
6
100.00%

/**
 * __alloc_bootmem_node - allocate boot memory from a specific node
 * @pgdat: node to allocate from
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may fall back to any node in the system if the specified node
 * can not hold the requested memory.
 *
 * The function panics if the request can not be satisfied.
 */


void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
				   unsigned long align, unsigned long goal)
{
	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
}

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Johannes Weiner
57
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1
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57
100.00%
1
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void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
				   unsigned long align, unsigned long goal)
{
	return __alloc_bootmem_node(pgdat, size, align, goal);
}


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Yinghai Lu
35
100.00%
1
100.00%
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35
100.00%
1
100.00%

/**
 * __alloc_bootmem_low - allocate low boot memory
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may happen on any node in the system.
 *
 * The function panics if the request can not be satisfied.
 */


void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
				  unsigned long goal)
{
	return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
}

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Yinghai Lu
31
100.00%
1
100.00%
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31
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1
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void * __init __alloc_bootmem_low_nopanic(unsigned long size,
					  unsigned long align,
					  unsigned long goal)
{
	return ___alloc_bootmem_nopanic(size, align, goal,
					ARCH_LOW_ADDRESS_LIMIT);
}

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Yinghai Lu
31
100.00%
1
100.00%
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31
100.00%
1
100.00%

/**
 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 * @pgdat: node to allocate from
 * @size: size of the request in bytes
 * @align: alignment of the region
 * @goal: preferred starting address of the region
 *
 * The goal is dropped if it can not be satisfied and the allocation will
 * fall back to memory below @goal.
 *
 * Allocation may fall back to any node in the system if the specified node
 * can not hold the requested memory.
 *
 * The function panics if the request can not be satisfied.
 */


void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
				       unsigned long align, unsigned long goal)
{
	if (WARN_ON_ONCE(slab_is_available()))
		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

	return ___alloc_bootmem_node(pgdat, size, align, goal,
				     ARCH_LOW_ADDRESS_LIMIT);
}
Contributors
Person
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CommitProp
Yinghai Lu
55
96.49%
1
50.00%
Johannes Weiner
2
3.51%
1
50.00%
Total
57
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
824
62.71%
5
13.51%
Johannes Weiner
198
15.07%
2
5.41%
Jiang Liu
90
6.85%
3
8.11%
Tony Luck
41
3.12%
2
5.41%
Robin Holt
33
2.51%
1
2.70%
Tejun Heo
30
2.28%
5
13.51%
David S. Miller
20
1.52%
1
2.70%
Nathan Zimmer
15
1.14%
1
2.70%
zijun_hu
11
0.84%
1
2.70%
JoonSoo Kim
9
0.68%
2
5.41%
Xishi Qiu
8
0.61%
1
2.70%
Grygorii Strashko
7
0.53%
2
5.41%
Philipp Hachtmann
6
0.46%
1
2.70%
Igor Mammedov
5
0.38%
1
2.70%
Tang Chen
5
0.38%
1
2.70%
Mel Gorman
4
0.30%
1
2.70%
Joe Perches
2
0.15%
1
2.70%
Wanlong Gao
1
0.08%
1
2.70%
Greg Kroah-Hartman
1
0.08%
1
2.70%
Catalin Marinas
1
0.08%
1
2.70%
Paul Gortmaker
1
0.08%
1
2.70%
Rashika Kheria
1
0.08%
1
2.70%
Wei Yang
1
0.08%
1
2.70%
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1314
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37
100.00%
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