memblock: Add debugfs files to dump the arrays content

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/mm/memblock.c b/mm/memblock.c
index 9de5fcdf8e2..cc15be29fd0 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -16,6 +16,8 @@
 #include <linux/bitops.h>
 #include <linux/poison.h>
 #include <linux/pfn.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 #include <linux/memblock.h>
 
 struct memblock memblock;
@@ -740,3 +742,52 @@ static int __init early_memblock(char *p)
 }
 early_param("memblock", early_memblock);
 
+#ifdef CONFIG_DEBUG_FS
+
+static int memblock_debug_show(struct seq_file *m, void *private)
+{
+        struct memblock_type *type = m->private;
+        struct memblock_region *reg;
+        int i;
+
+        for (i = 0; i < type->cnt; i++) {
+                reg = &type->regions[i];
+                seq_printf(m, "%4d: ", i);
+                if (sizeof(phys_addr_t) == 4)
+                        seq_printf(m, "0x%08lx..0x%08lx\n",
+                                   (unsigned long)reg->base,
+                                   (unsigned long)(reg->base + reg->size - 1));
+                else
+                        seq_printf(m, "0x%016llx..0x%016llx\n",
+                                   (unsigned long long)reg->base,
+                                   (unsigned long long)(reg->base + reg->size - 1));
+
+        }
+        return 0;
+}
+
+static int memblock_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, memblock_debug_show, inode->i_private);
+}
+
+static const struct file_operations memblock_debug_fops = {
+        .open = memblock_debug_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int __init memblock_init_debugfs(void)
+{
+        struct dentry *root = debugfs_create_dir("memblock", NULL);
+        if (!root)
+                return -ENXIO;
+        debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
+        debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);
+
+        return 0;
+}
+__initcall(memblock_init_debugfs);
+
+#endif /* CONFIG_DEBUG_FS */