Commit 34b71f1e authored by Tang Chen's avatar Tang Chen Committed by Linus Torvalds

page_alloc: add movable_memmap kernel parameter

Add functions to parse movablemem_map boot option.  Since the option
could be specified more then once, all the maps will be stored in the
global variable movablemem_map.map array.

And also, we keep the array in monotonic increasing order by start_pfn.
And merge all overlapped ranges.

[akpm@linux-foundation.org: improve comment]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: remove unneeded parens]
Signed-off-by: default avatarTang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
Reviewed-by: default avatarWen Congyang <wency@cn.fujitsu.com>
Tested-by: default avatarLin Feng <linfeng@cn.fujitsu.com>
Cc: Wu Jianguo <wujianguo@huawei.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4d59a751
......@@ -1640,6 +1640,23 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
that the amount of memory usable for all allocations
is not too small.
movablemem_map=nn[KMG]@ss[KMG]
[KNL,X86,IA-64,PPC] This parameter is similar to
memmap except it specifies the memory map of
ZONE_MOVABLE.
If more areas are all within one node, then from
lowest ss to the end of the node will be ZONE_MOVABLE.
If an area covers two or more nodes, the area from
ss to the end of the 1st node will be ZONE_MOVABLE,
and all the rest nodes will only have ZONE_MOVABLE.
If memmap is specified at the same time, the
movablemem_map will be limited within the memmap
areas. If kernelcore or movablecore is also specified,
movablemem_map will have higher priority to be
satisfied. So the administrator should be careful that
the amount of movablemem_map areas are not too large.
Otherwise kernel won't have enough memory to start.
MTD_Partition= [MTD]
Format: <name>,<region-number>,<size>,<offset>
......
......@@ -1359,6 +1359,17 @@ extern void free_bootmem_with_active_regions(int nid,
unsigned long max_low_pfn);
extern void sparse_memory_present_with_active_regions(int nid);
#define MOVABLEMEM_MAP_MAX MAX_NUMNODES
struct movablemem_entry {
unsigned long start_pfn; /* start pfn of memory segment */
unsigned long end_pfn; /* end pfn of memory segment (exclusive) */
};
struct movablemem_map {
int nr_map;
struct movablemem_entry map[MOVABLEMEM_MAP_MAX];
};
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
#if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
......
......@@ -202,6 +202,9 @@ static unsigned long __meminitdata nr_all_pages;
static unsigned long __meminitdata dma_reserve;
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/* Movable memory ranges, will also be used by memblock subsystem. */
struct movablemem_map movablemem_map;
static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
static unsigned long __initdata required_kernelcore;
......@@ -5078,6 +5081,134 @@ static int __init cmdline_parse_movablecore(char *p)
early_param("kernelcore", cmdline_parse_kernelcore);
early_param("movablecore", cmdline_parse_movablecore);
/**
* insert_movablemem_map - Insert a memory range in to movablemem_map.map.
* @start_pfn: start pfn of the range
* @end_pfn: end pfn of the range
*
* This function will also merge the overlapped ranges, and sort the array
* by start_pfn in monotonic increasing order.
*/
static void __init insert_movablemem_map(unsigned long start_pfn,
unsigned long end_pfn)
{
int pos, overlap;
/*
* pos will be at the 1st overlapped range, or the position
* where the element should be inserted.
*/
for (pos = 0; pos < movablemem_map.nr_map; pos++)
if (start_pfn <= movablemem_map.map[pos].end_pfn)
break;
/* If there is no overlapped range, just insert the element. */
if (pos == movablemem_map.nr_map ||
end_pfn < movablemem_map.map[pos].start_pfn) {
/*
* If pos is not the end of array, we need to move all
* the rest elements backward.
*/
if (pos < movablemem_map.nr_map)
memmove(&movablemem_map.map[pos+1],
&movablemem_map.map[pos],
sizeof(struct movablemem_entry) *
(movablemem_map.nr_map - pos));
movablemem_map.map[pos].start_pfn = start_pfn;
movablemem_map.map[pos].end_pfn = end_pfn;
movablemem_map.nr_map++;
return;
}
/* overlap will be at the last overlapped range */
for (overlap = pos + 1; overlap < movablemem_map.nr_map; overlap++)
if (end_pfn < movablemem_map.map[overlap].start_pfn)
break;
/*
* If there are more ranges overlapped, we need to merge them,
* and move the rest elements forward.
*/
overlap--;
movablemem_map.map[pos].start_pfn = min(start_pfn,
movablemem_map.map[pos].start_pfn);
movablemem_map.map[pos].end_pfn = max(end_pfn,
movablemem_map.map[overlap].end_pfn);
if (pos != overlap && overlap + 1 != movablemem_map.nr_map)
memmove(&movablemem_map.map[pos+1],
&movablemem_map.map[overlap+1],
sizeof(struct movablemem_entry) *
(movablemem_map.nr_map - overlap - 1));
movablemem_map.nr_map -= overlap - pos;
}
/**
* movablemem_map_add_region - Add a memory range into movablemem_map.
* @start: physical start address of range
* @end: physical end address of range
*
* This function transform the physical address into pfn, and then add the
* range into movablemem_map by calling insert_movablemem_map().
*/
static void __init movablemem_map_add_region(u64 start, u64 size)
{
unsigned long start_pfn, end_pfn;
/* In case size == 0 or start + size overflows */
if (start + size <= start)
return;
if (movablemem_map.nr_map >= ARRAY_SIZE(movablemem_map.map)) {
pr_err("movablemem_map: too many entries;"
" ignoring [mem %#010llx-%#010llx]\n",
(unsigned long long) start,
(unsigned long long) (start + size - 1));
return;
}
start_pfn = PFN_DOWN(start);
end_pfn = PFN_UP(start + size);
insert_movablemem_map(start_pfn, end_pfn);
}
/*
* cmdline_parse_movablemem_map - Parse boot option movablemem_map.
* @p: The boot option of the following format:
* movablemem_map=nn[KMG]@ss[KMG]
*
* This option sets the memory range [ss, ss+nn) to be used as movable memory.
*
* Return: 0 on success or -EINVAL on failure.
*/
static int __init cmdline_parse_movablemem_map(char *p)
{
char *oldp;
u64 start_at, mem_size;
if (!p)
goto err;
oldp = p;
mem_size = memparse(p, &p);
if (p == oldp)
goto err;
if (*p == '@') {
oldp = ++p;
start_at = memparse(p, &p);
if (p == oldp || *p != '\0')
goto err;
movablemem_map_add_region(start_at, mem_size);
return 0;
}
err:
return -EINVAL;
}
early_param("movablemem_map", cmdline_parse_movablemem_map);
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
/**
......
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