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percpu: unify allocation of schunk and dchunk

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Create a common allocator for first chunk initialization,
pcpu_alloc_first_chunk. Comments for this function will be added in a
later patch once the bitmap allocator is added.

Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Dennis Zhou (Facebook) 2017-07-24 19:02:02 -04:00 committed by Tejun Heo
parent b9c39442ce
commit 10edf5b0b6
1 changed files with 40 additions and 33 deletions
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73
mm/percpu.c
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@ -708,6 +708,36 @@ static void pcpu_free_area(struct pcpu_chunk *chunk, int freeme,
pcpu_chunk_relocate(chunk, oslot);
}
static struct pcpu_chunk * __init pcpu_alloc_first_chunk(void *base_addr,
int start_offset,
int map_size,
int *map,
int init_map_size)
{
struct pcpu_chunk *chunk;
chunk = memblock_virt_alloc(pcpu_chunk_struct_size, 0);
INIT_LIST_HEAD(&chunk->list);
INIT_LIST_HEAD(&chunk->map_extend_list);
chunk->base_addr = base_addr;
chunk->start_offset = start_offset;
chunk->map = map;
chunk->map_alloc = init_map_size;
/* manage populated page bitmap */
chunk->immutable = true;
bitmap_fill(chunk->populated, pcpu_unit_pages);
chunk->nr_populated = pcpu_unit_pages;
chunk->contig_hint = chunk->free_size = map_size;
chunk->map[0] = 1;
chunk->map[1] = chunk->start_offset;
chunk->map[2] = (chunk->start_offset + chunk->free_size) | 1;
chunk->map_used = 2;
return chunk;
}
static struct pcpu_chunk *pcpu_alloc_chunk(void)
{
struct pcpu_chunk *chunk;
@ -1570,6 +1600,7 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
unsigned int cpu;
int *unit_map;
int group, unit, i;
int map_size, start_offset;
#define PCPU_SETUP_BUG_ON(cond) do { \
if (unlikely(cond)) { \
@ -1678,44 +1709,20 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
* covers static area + reserved area (mostly used for module
* static percpu allocation).
*/
schunk = memblock_virt_alloc(pcpu_chunk_struct_size, 0);
INIT_LIST_HEAD(&schunk->list);
INIT_LIST_HEAD(&schunk->map_extend_list);
schunk->base_addr = base_addr;
schunk->start_offset = ai->static_size;
schunk->map = smap;
schunk->map_alloc = ARRAY_SIZE(smap);
schunk->immutable = true;
bitmap_fill(schunk->populated, pcpu_unit_pages);
schunk->nr_populated = pcpu_unit_pages;
schunk->free_size = ai->reserved_size ?: ai->dyn_size;
schunk->contig_hint = schunk->free_size;
schunk->map[0] = 1;
schunk->map[1] = schunk->start_offset;
schunk->map[2] = (ai->static_size + schunk->free_size) | 1;
schunk->map_used = 2;
start_offset = ai->static_size;
map_size = ai->reserved_size ?: ai->dyn_size;
schunk = pcpu_alloc_first_chunk(base_addr, start_offset, map_size,
smap, ARRAY_SIZE(smap));
/* init dynamic chunk if necessary */
if (ai->reserved_size) {
pcpu_reserved_chunk = schunk;
dchunk = memblock_virt_alloc(pcpu_chunk_struct_size, 0);
INIT_LIST_HEAD(&dchunk->list);
INIT_LIST_HEAD(&dchunk->map_extend_list);
dchunk->base_addr = base_addr;
dchunk->start_offset = ai->static_size + ai->reserved_size;
dchunk->map = dmap;
dchunk->map_alloc = ARRAY_SIZE(dmap);
dchunk->immutable = true;
bitmap_fill(dchunk->populated, pcpu_unit_pages);
dchunk->nr_populated = pcpu_unit_pages;
dchunk->contig_hint = dchunk->free_size = ai->dyn_size;
dchunk->map[0] = 1;
dchunk->map[1] = dchunk->start_offset;
dchunk->map[2] = (dchunk->start_offset + dchunk->free_size) | 1;
dchunk->map_used = 2;
start_offset = ai->static_size + ai->reserved_size;
map_size = ai->dyn_size;
dchunk = pcpu_alloc_first_chunk(base_addr, start_offset,
map_size, dmap,
ARRAY_SIZE(dmap));
}
/* link the first chunk in */