Prev: [PATCH 12/17] x86, memblock: Use memblock_debug to control debug message print out
Next: [PATCH 10/17] x86, memblock: Add memblock_x86_free_memory_in_range()
From: Yinghai Lu on 29 Jul 2010 15:50
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 memblock.reserved to
get all free range, and those ranges will convert to slab pages.

-v4: increase range size

Signed-off-by: Yinghai Lu <yinghai(a)kernel.org>
Cc: Jan Beulich <jbeulich(a)novell.com>
---
arch/x86/include/asm/memblock.h | 2 +
arch/x86/mm/memblock.c | 98 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 99 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/memblock.h b/arch/x86/include/asm/memblock.h
index e11ddf0..72639ce 100644
--- a/arch/x86/include/asm/memblock.h
+++ b/arch/x86/include/asm/memblock.h
@@ -8,5 +8,7 @@ void memblock_x86_to_bootmem(u64 start, u64 end);

void memblock_x86_reserve_range(u64 start, u64 end, char *name);
void memblock_x86_free_range(u64 start, u64 end);
+struct range;
+int get_free_all_memory_range(struct range **rangep, int nodeid);

#endif
diff --git a/arch/x86/mm/memblock.c b/arch/x86/mm/memblock.c
index 9829eaf..b450060 100644
--- a/arch/x86/mm/memblock.c
+++ b/arch/x86/mm/memblock.c
@@ -86,7 +86,103 @@ u64 __init memblock_x86_find_in_range_size(u64 start, u64 *sizep, u64 align)
return MEMBLOCK_ERROR;
}

-#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 = memblock.current_limit;
+
+ mem = memblock_find_in_range(0, end, size, sizeof(struct range));
+ if (mem == MEMBLOCK_ERROR)
+ 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 memblock_x86_subtract_reserved(struct range *range, int az)
+{
+ u64 final_start, final_end;
+ struct memblock_region *r;
+
+ /* Take out region array itself at first*/
+ memblock_free_reserved_regions();
+
+ pr_info("Subtract (%ld early reservations)\n", memblock.reserved.cnt);
+
+ for_each_memblock(reserved, r) {
+ pr_info(" [%010llx-%010llx]\n", (u64)r->base, (u64)r->base + r->size - 1);
+ 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 ? */
+ memblock_reserve_reserved_regions();
+}
+
+struct count_data {
+ int nr;
+};
+
+static int __init count_work_fn(unsigned long start_pfn,
+ unsigned long end_pfn, void *datax)
+{
+ struct count_data *data = datax;
+
+ data->nr++;
+
+ return 0;
+}
+
+static int __init count_early_node_map(int nodeid)
+{
+ struct count_data data;
+
+ data.nr = 0;
+ work_with_active_regions(nodeid, count_work_fn, &data);
+
+ return data.nr;
+}
+
+int __init get_free_all_memory_range(struct range **rangep, int nodeid)
+{
+ int count;
+ struct range *range;
+ int nr_range;
+
+ count = (memblock.reserved.cnt + count_early_node_map(nodeid)) * 2;
+
+ range = find_range_array(count);
+ nr_range = 0;
+
+ /*
+ * Use early_node_map[] and memblock.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
+ memblock_x86_subtract_reserved(range, count);
+ nr_range = clean_sort_range(range, count);
+
+ *rangep = range;
+ return nr_range;
+}
+#else
void __init memblock_x86_to_bootmem(u64 start, u64 end)
{
int count;
--
1.6.4.2

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Prev: [PATCH 12/17] x86, memblock: Use memblock_debug to control debug message print out
Next: [PATCH 10/17] x86, memblock: Add memblock_x86_free_memory_in_range()