[PATCH v2 02/10] ubi: Expose mean erase counter for fastmap in sysfs

[Rickard Andersson]

Since the fastmap area has its own wear levelling it is valuable to
provide a mean value for that area. This value can be used in order
to estimate life expectancy of the flash.

Signed-off-by: Rickard Andersson <rickard.andersson at axis.com>
---
 drivers/mtd/ubi/build.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index fa38c434e447..3633c743e7d1 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -133,6 +133,10 @@ static struct device_attribute dev_max_ec =
 	__ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL);
 static struct device_attribute dev_mean_ec =
 	__ATTR(mean_ec, S_IRUGO, dev_attribute_show, NULL);
+#ifdef CONFIG_MTD_UBI_FASTMAP
+static struct device_attribute dev_mean_ec_fastmap =
+	__ATTR(mean_ec_fastmap, S_IRUGO, dev_attribute_show, NULL);
+#endif
 static struct device_attribute dev_reserved_for_bad =
 	__ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL);
 static struct device_attribute dev_bad_peb_count =
@@ -413,6 +417,10 @@ static ssize_t dev_attribute_show(struct device *dev,
 		ret = sprintf(buf, "%d\n", ubi->max_ec);
 	else if (attr == &dev_mean_ec)
 		ret = sprintf(buf, "%d\n", ubi_calc_mean_ec(ubi, 0, ubi->peb_count));
+#ifdef CONFIG_MTD_UBI_FASTMAP
+	else if (attr == &dev_mean_ec_fastmap)
+		ret = sprintf(buf, "%d\n", ubi_calc_mean_ec(ubi, 0, UBI_FM_MAX_START));
+#endif
 	else if (attr == &dev_reserved_for_bad)
 		ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs);
 	else if (attr == &dev_bad_peb_count)
@@ -440,6 +448,9 @@ static struct attribute *ubi_dev_attrs[] = {
 	&dev_volumes_count.attr,
 	&dev_max_ec.attr,
 	&dev_mean_ec.attr,
+#ifdef CONFIG_MTD_UBI_FASTMAP
+	&dev_mean_ec_fastmap.attr,
+#endif
 	&dev_reserved_for_bad.attr,
 	&dev_bad_peb_count.attr,
 	&dev_max_vol_count.attr,
-- 
2.30.2