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Message-Id: <1278455982-24621-39-git-send-email-yinghai@kernel.org>
Date: Tue, 6 Jul 2010 15:39:31 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
David Miller <davem@...emloft.net>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Johannes Weiner <hannes@...xchg.org>,
linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
Yinghai Lu <yinghai@...nel.org>,
Jan Beulich <jbeulich@...ell.com>
Subject: [PATCH 38/49] x86, memblock: Add get_free_all_memory_range()
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@...nel.org>
Cc: Jan Beulich <jbeulich@...ell.com>
---
arch/x86/include/asm/memblock.h | 2 +
arch/x86/mm/memblock.c | 102 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 103 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 4e065b5..249754b 100644
--- a/arch/x86/mm/memblock.c
+++ b/arch/x86/mm/memblock.c
@@ -86,7 +86,107 @@ 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)
+{
+ int count;
+ u64 final_start, final_end;
+ struct memblock_region *r;
+
+ /* Take out region array itself at first*/
+ if (memblock.reserved.regions != memblock_reserved_init_regions)
+ memblock_free(__pa(memblock.reserved.regions), sizeof(struct memblock_region) * memblock.reserved.max);
+
+ count = memblock.reserved.cnt;
+
+ pr_info("Subtract (%d early reservations)\n", count);
+
+ for_each_memblock(reserved, r) {
+ pr_info(" [%010llx - %010llx]\n", (u64)r->base, (u64)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 (memblock.reserved.regions != memblock_reserved_init_regions)
+ memblock_reserve(__pa(memblock.reserved.regions), sizeof(struct memblock_region) * memblock.reserved.max);
+}
+
+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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