[RFC PATCH 02/12] mm: introduce mirror_info

[Xishi Qiu <qiuxishi@xxxxxxxxxx>]

This patch introduces a new struct called "mirror_info", it is used to storage
the mirror address range which reported by EFI or ACPI.

TBD: call add_mirror_info() to fill it.

Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
---
 arch/x86/mm/numa.c     |  3 +++
 include/linux/mmzone.h | 15 +++++++++++++++
 mm/page_alloc.c        | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 4053bb5..781fd68 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -619,6 +619,9 @@ static int __init numa_init(int (*init_func)(void))
 	/* In case that parsing SRAT failed. */
 	WARN_ON(memblock_clear_hotplug(0, ULLONG_MAX));
 	numa_reset_distance();
+#ifdef CONFIG_MEMORY_MIRROR
+	memset(&mirror_info, 0, sizeof(mirror_info));
+#endif
 
 	ret = init_func();
 	if (ret < 0)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 54d74f6..1fae07b 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -69,6 +69,21 @@ enum {
 #  define is_migrate_cma(migratetype) false
 #endif
 
+#ifdef CONFIG_MEMORY_MIRROR
+struct numa_mirror_info {
+	int node;
+	unsigned long start;
+	unsigned long size;
+};
+
+struct mirror_info {
+	int count;
+	struct numa_mirror_info info[MAX_NUMNODES];
+};
+
+extern struct mirror_info mirror_info;
+#endif
+
 #define for_each_migratetype_order(order, type) \
 	for (order = 0; order < MAX_ORDER; order++) \
 		for (type = 0; type < MIGRATE_TYPES; type++)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ebffa0e..41a95a7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -210,6 +210,10 @@ static char * const zone_names[MAX_NR_ZONES] = {
 int min_free_kbytes = 1024;
 int user_min_free_kbytes = -1;
 
+#ifdef CONFIG_MEMORY_MIRROR
+struct mirror_info mirror_info;
+#endif
+
 static unsigned long __meminitdata nr_kernel_pages;
 static unsigned long __meminitdata nr_all_pages;
 static unsigned long __meminitdata dma_reserve;
@@ -545,6 +549,31 @@ static inline int page_is_buddy(struct page *page, struct page *buddy,
 	return 0;
 }
 
+#ifdef CONFIG_MEMORY_MIRROR
+static void __init add_mirror_info(int node,
+			unsigned long start, unsigned long size)
+{
+	mirror_info.info[mirror_info.count].node = node;
+	mirror_info.info[mirror_info.count].start = start;
+	mirror_info.info[mirror_info.count].size = size;
+
+	mirror_info.count++;
+}
+
+static void __init print_mirror_info(void)
+{
+	int i;
+
+	printk("Mirror info\n");
+	for (i = 0; i < mirror_info.count; i++)
+		printk("  node %3d: [mem %#010lx-%#010lx]\n",
+			mirror_info.info[i].node,
+			mirror_info.info[i].start,
+			mirror_info.info[i].start +
+				mirror_info.info[i].size - 1);
+}
+#endif
+
 /*
  * Freeing function for a buddy system allocator.
  *
@@ -5438,6 +5467,10 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
 			       (u64)zone_movable_pfn[i] << PAGE_SHIFT);
 	}
 
+#ifdef CONFIG_MEMORY_MIRROR
+	print_mirror_info();
+#endif
+
 	/* Print out the early node map */
 	pr_info("Early memory node ranges\n");
 	for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid)
-- 
2.0.0


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