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Subject[PATCH 08/22] lmb: Add get_free_all_memory_range()
Date
get_free_all_memory_range is for CONFIG_NO_BOOTMEM=y, and will be called by
free_all_memory_core_early().

It will use early_node_map aka active ranges subtract lmb.reserved to
get all free range, and those ranges will convert to slab pages.

-v3: use __lmb_find_base() to get range free buffer.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Jan Beulich <jbeulich@novell.com>
---
include/linux/lmb.h | 2 +
mm/lmb.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 87 insertions(+), 1 deletions(-)
diff --git a/include/linux/lmb.h b/include/linux/lmb.h
index 2c008b9..aaef2ca 100644
--- a/include/linux/lmb.h
+++ b/include/linux/lmb.h
@@ -93,6 +93,8 @@ u64 __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
u64 lmb_find_area(u64 start, u64 end, u64 size, u64 align);

void lmb_to_bootmem(u64 start, u64 end);
+struct range;
+int get_free_all_memory_range(struct range **rangep, int nodeid);

#include <asm/lmb.h>

diff --git a/mm/lmb.c b/mm/lmb.c
index ccbc76d..2e19df9 100644
--- a/mm/lmb.c
+++ b/mm/lmb.c
@@ -630,7 +630,91 @@ void __init lmb_free_area(u64 start, u64 end)
__check_and_double_region_array(&lmb.reserved, &lmb_reserved_region[0]);
}

-#ifndef CONFIG_NO_BOOTMEM
+static __init struct range *find_range_array(int count)
+{
+ u64 end, size, mem;
+ struct range *range;
+
+ size = sizeof(struct range) * count;
+ end = lmb.default_alloc_limit;
+
+ mem = __lmb_find_base(size, sizeof(struct range), end);
+ if (mem == -1ULL)
+ panic("can not find more space for range array");
+
+ /*
+ * This range is tempoaray, so don't reserve it, it will not be
+ * overlapped because We will not alloccate new buffer before
+ * We discard this one
+ */
+ range = __va(mem);
+ memset(range, 0, size);
+
+ return range;
+}
+
+#ifdef CONFIG_NO_BOOTMEM
+static void __init subtract_lmb_reserved(struct range *range, int az)
+{
+ int i, count;
+ u64 final_start, final_end;
+
+ /* Take out region array itself at first*/
+ if (lmb.reserved.region != lmb_reserved_region)
+ lmb_free(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
+
+ count = lmb.reserved.cnt;
+
+ pr_info("Subtract (%d early reservations)\n", count);
+
+ for (i = 0; i < count; i++) {
+ struct lmb_property *r = &lmb.reserved.region[i];
+ pr_info(" #%d [%010llx - %010llx]\n", i, r->base, r->base + r->size);
+ final_start = PFN_DOWN(r->base);
+ final_end = PFN_UP(r->base + r->size);
+ if (final_start >= final_end)
+ continue;
+ subtract_range(range, az, final_start, final_end);
+ }
+ /* Put region array back ? */
+ if (lmb.reserved.region != lmb_reserved_region)
+ lmb_reserve(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
+}
+
+int __init get_free_all_memory_range(struct range **rangep, int nodeid)
+{
+ int count;
+ struct range *range;
+ int nr_range;
+
+ count = lmb.reserved.cnt * 2;
+
+ range = find_range_array(count);
+ nr_range = 0;
+
+ /*
+ * Use early_node_map[] and lmb.reserved.region to get range array
+ * at first
+ */
+ nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
+#ifdef CONFIG_X86_32
+ subtract_range(range, count, max_low_pfn, -1ULL);
+#endif
+ subtract_lmb_reserved(range, count);
+ nr_range = clean_sort_range(range, count);
+
+ /* Need to clear it ? */
+ if (nodeid == MAX_NUMNODES) {
+ memset(&lmb.reserved.region[0], 0, sizeof(struct lmb_property) * lmb.reserved.nr_regions);
+ lmb.reserved.region = NULL;
+ lmb.reserved.nr_regions = 0;
+ lmb.reserved.cnt = 0;
+ }
+
+ *rangep = range;
+ return nr_range;
+}
+#else
void __init lmb_to_bootmem(u64 start, u64 end)
{
int i, count;
--
1.6.4.2


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