[PATCH v3 05/10] ubi: Expose max erase counter for data in sysfs

Rickard Andersson
2024-10-11T13:01:20Z

Expose max erase counter for data area in sysfs. Data area includes
all blocks except for the fastmap area.

This value can be used in order to estimate life expectancy of the
flash.

Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Rickard Andersson <rickard.andersson@axis.com>
---
drivers/mtd/ubi/build.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 9cc7bc74f0d2..fa1ff0146572 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -138,6 +138,8 @@ static struct device_attribute dev_max_ec_fastmap =
__ATTR(max_ec_fastmap, S_IRUGO, dev_attribute_show, NULL);
static struct device_attribute dev_mean_ec_fastmap =
__ATTR(mean_ec_fastmap, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_max_ec_data =
+ __ATTR(max_ec_data, S_IRUGO, dev_attribute_show, NULL);
static struct device_attribute dev_mean_ec_data =
__ATTR(mean_ec_data, S_IRUGO, dev_attribute_show, NULL);
#endif
@@ -462,6 +464,8 @@ static ssize_t dev_attribute_show(struct device *dev,
ret = sprintf(buf, "%d\n", ubi_calc_max_ec(ubi, 0, UBI_FM_MAX_START));
else if (attr == &dev_mean_ec_fastmap)
ret = sprintf(buf, "%d\n", ubi_calc_mean_ec(ubi, 0, UBI_FM_MAX_START));
+ else if (attr == &dev_max_ec_data)
+ ret = sprintf(buf, "%d\n", ubi_calc_max_ec(ubi, UBI_FM_MAX_START, ubi->peb_count));
else if (attr == &dev_mean_ec_data)
ret = sprintf(buf, "%d\n", ubi_calc_mean_ec(ubi, UBI_FM_MAX_START, ubi->peb_count));
#endif
@@ -495,6 +499,7 @@ static struct attribute *ubi_dev_attrs[] = {
#ifdef CONFIG_MTD_UBI_FASTMAP
&dev_max_ec_fastmap.attr,
&dev_mean_ec_fastmap.attr,
+ &dev_max_ec_data.attr,
&dev_mean_ec_data.attr,
#endif
&dev_reserved_for_bad.attr,