2 files changed, 96 insertions, 0 deletions

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index c36a55d3c1c2..31def584cceb 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -61,6 +61,26 @@ extern long memblock_remove(phys_addr_t base, phys_addr_t size);
 extern long memblock_free(phys_addr_t base, phys_addr_t size);
 extern long memblock_reserve(phys_addr_t base, phys_addr_t size);
 
+extern void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
+                                  phys_addr_t *out_end, int *out_nid);
+
+/**
+ * for_each_free_mem_range - iterate through free memblock areas
+ * @i: u64 used as loop variable
+ * @nid: node selector, %MAX_NUMNODES for all nodes
+ * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
+ * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
+ * @p_nid: ptr to int for nid of the range, can be %NULL
+ *
+ * Walks over free (memory && !reserved) areas of memblock.  Available as
+ * soon as memblock is initialized.
+ */
+#define for_each_free_mem_range(i, nid, p_start, p_end, p_nid)          \
+        for (i = 0,                                                     \
+             __next_free_mem_range(&i, nid, p_start, p_end, p_nid);     \
+             i != (u64)ULLONG_MAX;                                      \
+             __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
+
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 extern int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
 
diff --git a/mm/memblock.c b/mm/memblock.c
index e815f4b75809..c4a8750406fc 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -461,6 +461,82 @@ long __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
         return memblock_add_region(_rgn, base, size);
 }
 
+/**
+ * __next_free_mem_range - next function for for_each_free_mem_range()
+ * @idx: pointer to u64 loop variable
+ * @nid: nid: node selector, %MAX_NUMNODES for all nodes
+ * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
+ * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
+ * @p_nid: ptr to int for nid of the range, can be %NULL
+ *
+ * Find the first free area from *@idx which matches @nid, fill the out
+ * parameters, and update *@idx for the next iteration.  The lower 32bit of
+ * *@idx contains index into memory region and the upper 32bit indexes the
+ * areas before each reserved region.  For example, if reserved regions
+ * look like the following,
+ *
+ *      0:[0-16), 1:[32-48), 2:[128-130)
+ *
+ * The upper 32bit indexes the following regions.
+ *
+ *      0:[0-0), 1:[16-32), 2:[48-128), 3:[130-MAX)
+ *
+ * As both region arrays are sorted, the function advances the two indices
+ * in lockstep and returns each intersection.
+ */
+void __init_memblock __next_free_mem_range(u64 *idx, int nid,
+                                           phys_addr_t *out_start,
+                                           phys_addr_t *out_end, int *out_nid)
+{
+        struct memblock_type *mem = &memblock.memory;
+        struct memblock_type *rsv = &memblock.reserved;
+        int mi = *idx & 0xffffffff;
+        int ri = *idx >> 32;
+
+        for ( ; mi < mem->cnt; mi++) {
+                struct memblock_region *m = &mem->regions[mi];
+                phys_addr_t m_start = m->base;
+                phys_addr_t m_end = m->base + m->size;
+
+                /* only memory regions are associated with nodes, check it */
+                if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
+                        continue;
+
+                /* scan areas before each reservation for intersection */
+                for ( ; ri < rsv->cnt + 1; ri++) {
+                        struct memblock_region *r = &rsv->regions[ri];
+                        phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
+                        phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX;
+
+                        /* if ri advanced past mi, break out to advance mi */
+                        if (r_start >= m_end)
+                                break;
+                        /* if the two regions intersect, we're done */
+                        if (m_start < r_end) {
+                                if (out_start)
+                                        *out_start = max(m_start, r_start);
+                                if (out_end)
+                                        *out_end = min(m_end, r_end);
+                                if (out_nid)
+                                        *out_nid = memblock_get_region_node(m);
+                                /*
+                                 * The region which ends first is advanced
+                                 * for the next iteration.
+                                 */
+                                if (m_end <= r_end)
+                                        mi++;
+                                else
+                                        ri++;
+                                *idx = (u32)mi | (u64)ri << 32;
+                                return;
+                        }
+                }
+        }
+
+        /* signal end of iteration */
+        *idx = ULLONG_MAX;
+}
+
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 /*
  * Common iterator interface used to define for_each_mem_range().