[S390] Add crypto support for 3592 tape devices

3592 tape devices are able to write data encrpyted on tape mediums.
This z/Linux device driver support includes the following functions:
 * ioctl to switch on/off encryption
 * ioctl to query encryption status of drive
 * ioctls to set and query key encrypting keys (kekls)
 * long busy interrupt handling

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 16 insertions, 6 deletions

diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h
index c9f1c4c8bb13..bb4ff537729d 100644
--- a/drivers/s390/char/tape.h
+++ b/drivers/s390/char/tape.h
@@ -3,7 +3,7 @@
  *    tape device driver for 3480/3490E/3590 tapes.
  *
  *  S390 and zSeries version
- *    Copyright (C) 2001,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Copyright IBM Corp. 2001,2006
  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  *               Tuan Ngo-Anh <ngoanh@de.ibm.com>
  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
@@ -99,7 +99,11 @@ enum tape_op {
         TO_DIS,         /* Tape display */
         TO_ASSIGN,      /* Assign tape to channel path */
         TO_UNASSIGN,    /* Unassign tape from channel path */
-        TO_SIZE         /* #entries in tape_op_t */
+        TO_CRYPT_ON,    /* Enable encrpytion */
+        TO_CRYPT_OFF,   /* Disable encrpytion */
+        TO_KEKL_SET,    /* Set KEK label */
+        TO_KEKL_QUERY,  /* Query KEK label */
+        TO_SIZE,        /* #entries in tape_op_t */
 };
 
 /* Forward declaration */
@@ -112,6 +116,7 @@ enum tape_request_status {
         TAPE_REQUEST_IN_IO,     /* request is currently in IO */
         TAPE_REQUEST_DONE,      /* request is completed. */
         TAPE_REQUEST_CANCEL,    /* request should be canceled. */
+        TAPE_REQUEST_LONG_BUSY, /* request has to be restarted after long busy */
 };
 
 /* Tape CCW request */
@@ -164,10 +169,11 @@ struct tape_discipline {
  * The discipline irq function either returns an error code (<0) which
  * means that the request has failed with an error or one of the following:
  */
-#define TAPE_IO_SUCCESS 0       /* request successful */
-#define TAPE_IO_PENDING 1       /* request still running */
-#define TAPE_IO_RETRY   2       /* retry to current request */
-#define TAPE_IO_STOP    3       /* stop the running request */
+#define TAPE_IO_SUCCESS         0       /* request successful */
+#define TAPE_IO_PENDING         1       /* request still running */
+#define TAPE_IO_RETRY           2       /* retry to current request */
+#define TAPE_IO_STOP            3       /* stop the running request */
+#define TAPE_IO_LONG_BUSY       4       /* delay the running request */
 
 /* Char Frontend Data */
 struct tape_char_data {
@@ -242,6 +248,10 @@ struct tape_device {
 
         /* Function to start or stop the next request later. */
         struct delayed_work             tape_dnr;
+
+        /* Timer for long busy */
+        struct timer_list               lb_timeout;
+
 };
 
 /* Externals from tape_core.c */