[PATCH 1/2] ubi: Expose interface for reading erase counters

[Rickard Andersson]

Using the ioctl command 'UBI_IOCECNFO' user space can obtain mean
and max erase counters of a device. If fastmap is enabled also erase
counter information of that area and its complementary area is
provided.

Signed-off-by: Rickard Andersson <rickard.andersson at axis.com>
---
 include/uapi/mtd/ubi-user.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/include/uapi/mtd/ubi-user.h b/include/uapi/mtd/ubi-user.h
index e1571603175e..00cc8a083675 100644
--- a/include/uapi/mtd/ubi-user.h
+++ b/include/uapi/mtd/ubi-user.h
@@ -175,6 +175,8 @@
 #define UBI_IOCRPEB _IOW(UBI_IOC_MAGIC, 4, __s32)
 /* Force scrubbing on the specified PEB */
 #define UBI_IOCSPEB _IOW(UBI_IOC_MAGIC, 5, __s32)
+/* Read detailed device information */
+#define UBI_IOCECNFO _IOR(UBI_IOC_MAGIC, 6, struct ubi_ecinfo_res)
 
 /* ioctl commands of the UBI control character device */
 
@@ -470,4 +472,27 @@ struct ubi_blkcreate_req {
 	__s8  padding[128];
 }  __packed;
 
+/**
+ * struct ubi_ecinfo_res - a data structure used in UBI device erase count
+ * information responses.
+ *
+ * @max_ec: Max physical erase block erase counter value of whole UBI device
+ * @mean_ec: Mean physical erase block erase counter value of whole UBI device
+ * @max_ec_fastmap: Max physical erase block erase counter value of fastmap area
+ * @mean_ec_fastmap: Mean physical erase block erase counter value of fastmap area
+ * @max_ec_data: Max physical erase block erase counter value of data area
+ * @mean_ec_data: Mean physical erase block erase counter value of data area
+ *
+ * @padding: reserved for future, not used, has to be zeroed
+ */
+struct ubi_ecinfo_res {
+	__s32 max_ec;
+	__s32 mean_ec;
+	__s32 max_ec_fastmap;
+	__s32 mean_ec_fastmap;
+	__s32 max_ec_data;
+	__s32 mean_ec_data;
+	__s8  padding[64];
+}  __packed;
+
 #endif /* __UBI_USER_H__ */
-- 
2.30.2