UBI: Add initial support for fastmap self checks

Using this debugfs knob fastmap self checks can be controlled.

Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Tanya Brokhman <tlinder@codeaurora.org>

3 files changed, 20 insertions, 0 deletions

diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index 7335c9ff9d99..224fed085102 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -275,6 +275,8 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
                 val = d->chk_gen;
         else if (dent == d->dfs_chk_io)
                 val = d->chk_io;
+        else if (dent == d->dfs_chk_fastmap)
+                val = d->chk_fastmap;
         else if (dent == d->dfs_disable_bgt)
                 val = d->disable_bgt;
         else if (dent == d->dfs_emulate_bitflips)
@@ -336,6 +338,8 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
                 d->chk_gen = val;
         else if (dent == d->dfs_chk_io)
                 d->chk_io = val;
+        else if (dent == d->dfs_chk_fastmap)
+                d->chk_fastmap = val;
         else if (dent == d->dfs_disable_bgt)
                 d->disable_bgt = val;
         else if (dent == d->dfs_emulate_bitflips)
@@ -406,6 +410,13 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
                 goto out_remove;
         d->dfs_chk_io = dent;
 
+        fname = "chk_fastmap";
+        dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
+                                   &dfs_fops);
+        if (IS_ERR_OR_NULL(dent))
+                goto out_remove;
+        d->dfs_chk_fastmap = dent;
+
         fname = "tst_disable_bgt";
         dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
                                    &dfs_fops);
diff --git a/drivers/mtd/ubi/debug.h b/drivers/mtd/ubi/debug.h
index cba89fcd1587..e99ef37a321e 100644
--- a/drivers/mtd/ubi/debug.h
+++ b/drivers/mtd/ubi/debug.h
@@ -127,4 +127,9 @@ static inline int ubi_dbg_chk_gen(const struct ubi_device *ubi)
 {
         return ubi->dbg.chk_gen;
 }
+
+static inline int ubi_dbg_chk_fastmap(const struct ubi_device *ubi)
+{
+        return ubi->dbg.chk_fastmap;
+}
 #endif /* !__UBI_DEBUG_H__ */
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 058c84cac8dc..adc633cb89c3 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -356,6 +356,7 @@ struct ubi_wl_entry;
  *
  * @chk_gen: if UBI general extra checks are enabled
  * @chk_io: if UBI I/O extra checks are enabled
+ * @chk_fastmap: if UBI fastmap extra checks are enabled
  * @disable_bgt: disable the background task for testing purposes
  * @emulate_bitflips: emulate bit-flips for testing purposes
  * @emulate_io_failures: emulate write/erase failures for testing purposes
@@ -363,6 +364,7 @@ struct ubi_wl_entry;
  * @dfs_dir: direntry object of the UBI device debugfs directory
  * @dfs_chk_gen: debugfs knob to enable UBI general extra checks
  * @dfs_chk_io: debugfs knob to enable UBI I/O extra checks
+ * @dfs_chk_fastmap: debugfs knob to enable UBI fastmap extra checks
  * @dfs_disable_bgt: debugfs knob to disable the background task
  * @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
  * @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
@@ -370,6 +372,7 @@ struct ubi_wl_entry;
 struct ubi_debug_info {
         unsigned int chk_gen:1;
         unsigned int chk_io:1;
+        unsigned int chk_fastmap:1;
         unsigned int disable_bgt:1;
         unsigned int emulate_bitflips:1;
         unsigned int emulate_io_failures:1;
@@ -377,6 +380,7 @@ struct ubi_debug_info {
         struct dentry *dfs_dir;
         struct dentry *dfs_chk_gen;
         struct dentry *dfs_chk_io;
+        struct dentry *dfs_chk_fastmap;
         struct dentry *dfs_disable_bgt;
         struct dentry *dfs_emulate_bitflips;
         struct dentry *dfs_emulate_io_failures;