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-rw-r--r--mm/sparse.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/mm/sparse.c b/mm/sparse.c
index 20ca292d8f11..248d5d7bbf55 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -200,6 +200,11 @@ static inline int next_present_section_nr(int section_nr)
(section_nr <= __highest_present_section_nr)); \
section_nr = next_present_section_nr(section_nr))
+static inline unsigned long first_present_section_nr(void)
+{
+ return next_present_section_nr(-1);
+}
+
/*
* Record how many memory sections are marked as present
* during system bootup.
@@ -668,6 +673,86 @@ void __init sparse_init(void)
memblock_free_early(__pa(usemap_map), size);
}
+/*
+ * Initialize sparse on a specific node. The node spans [pnum_begin, pnum_end)
+ * And number of present sections in this node is map_count.
+ */
+static void __init sparse_init_nid(int nid, unsigned long pnum_begin,
+ unsigned long pnum_end,
+ unsigned long map_count)
+{
+ unsigned long pnum, usemap_longs, *usemap;
+ struct page *map;
+
+ usemap_longs = BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS);
+ usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nid),
+ usemap_size() *
+ map_count);
+ if (!usemap) {
+ pr_err("%s: node[%d] usemap allocation failed", __func__, nid);
+ goto failed;
+ }
+ sparse_buffer_init(map_count * section_map_size(), nid);
+ for_each_present_section_nr(pnum_begin, pnum) {
+ if (pnum >= pnum_end)
+ break;
+
+ map = sparse_mem_map_populate(pnum, nid, NULL);
+ if (!map) {
+ pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.",
+ __func__, nid);
+ pnum_begin = pnum;
+ goto failed;
+ }
+ check_usemap_section_nr(nid, usemap);
+ sparse_init_one_section(__nr_to_section(pnum), pnum, map, usemap);
+ usemap += usemap_longs;
+ }
+ sparse_buffer_fini();
+ return;
+failed:
+ /* We failed to allocate, mark all the following pnums as not present */
+ for_each_present_section_nr(pnum_begin, pnum) {
+ struct mem_section *ms;
+
+ if (pnum >= pnum_end)
+ break;
+ ms = __nr_to_section(pnum);
+ ms->section_mem_map = 0;
+ }
+}
+
+/*
+ * Allocate the accumulated non-linear sections, allocate a mem_map
+ * for each and record the physical to section mapping.
+ */
+void __init new_sparse_init(void)
+{
+ unsigned long pnum_begin = first_present_section_nr();
+ int nid_begin = sparse_early_nid(__nr_to_section(pnum_begin));
+ unsigned long pnum_end, map_count = 1;
+
+ /* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */
+ set_pageblock_order();
+
+ for_each_present_section_nr(pnum_begin + 1, pnum_end) {
+ int nid = sparse_early_nid(__nr_to_section(pnum_end));
+
+ if (nid == nid_begin) {
+ map_count++;
+ continue;
+ }
+ /* Init node with sections in range [pnum_begin, pnum_end) */
+ sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
+ nid_begin = nid;
+ pnum_begin = pnum_end;
+ map_count = 1;
+ }
+ /* cover the last node */
+ sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count);
+ vmemmap_populate_print_last();
+}
+
#ifdef CONFIG_MEMORY_HOTPLUG
/* Mark all memory sections within the pfn range as online */