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    Subject[PATCH 25/31] memblock: Add debugfs files to dump the arrays content
    Date
    From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

    Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    ---
    mm/memblock.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 51 insertions(+), 0 deletions(-)

    diff --git a/mm/memblock.c b/mm/memblock.c
    index 424ca11..b5eb901 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;
    @@ -714,3 +716,52 @@ 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 */
    --
    1.6.4.2


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