s390/dasd: configurable IFCC handling

Make the behavior in case of constant IFCC/CCC errors configurable.
Add a sysfs attribute to switch between path disabled after threshold
exceeded (default) and message only.

Reviewed-by: Jan Hoeppner <hoeppner@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 20 insertions, 18 deletions

diff --git a/arch/s390/include/uapi/asm/dasd.h b/arch/s390/include/uapi/asm/dasd.h
index 451c601406b6..832be5c2584f 100644
--- a/arch/s390/include/uapi/asm/dasd.h
+++ b/arch/s390/include/uapi/asm/dasd.h
@@ -68,25 +68,27 @@ typedef struct dasd_information2_t {
 #define DASD_FORMAT_CDL  2
 /*
  * values to be used for dasd_information_t.features
- * 0x00: default features
- * 0x01: readonly (ro)
- * 0x02: use diag discipline (diag)
- * 0x04: set the device initially online (internal use only)
- * 0x08: enable ERP related logging
- * 0x10: allow I/O to fail on lost paths
- * 0x20: allow I/O to fail when a lock was stolen
- * 0x40: give access to raw eckd data
- * 0x80: enable discard support
+ * 0x100: default features
+ * 0x001: readonly (ro)
+ * 0x002: use diag discipline (diag)
+ * 0x004: set the device initially online (internal use only)
+ * 0x008: enable ERP related logging
+ * 0x010: allow I/O to fail on lost paths
+ * 0x020: allow I/O to fail when a lock was stolen
+ * 0x040: give access to raw eckd data
+ * 0x080: enable discard support
+ * 0x100: enable autodisable for IFCC errors (default)
  */
-#define DASD_FEATURE_DEFAULT         0x00
-#define DASD_FEATURE_READONLY        0x01
-#define DASD_FEATURE_USEDIAG         0x02
-#define DASD_FEATURE_INITIAL_ONLINE  0x04
-#define DASD_FEATURE_ERPLOG          0x08
-#define DASD_FEATURE_FAILFAST        0x10
-#define DASD_FEATURE_FAILONSLCK      0x20
-#define DASD_FEATURE_USERAW          0x40
-#define DASD_FEATURE_DISCARD         0x80
+#define DASD_FEATURE_READONLY         0x001
+#define DASD_FEATURE_USEDIAG          0x002
+#define DASD_FEATURE_INITIAL_ONLINE   0x004
+#define DASD_FEATURE_ERPLOG           0x008
+#define DASD_FEATURE_FAILFAST         0x010
+#define DASD_FEATURE_FAILONSLCK       0x020
+#define DASD_FEATURE_USERAW           0x040
+#define DASD_FEATURE_DISCARD          0x080
+#define DASD_FEATURE_PATH_AUTODISABLE 0x100
+#define DASD_FEATURE_DEFAULT          DASD_FEATURE_PATH_AUTODISABLE
 
 #define DASD_PARTN_BITS 2