[S390] dasd: add High Performance FICON support

To support High Performance FICON, the DASD device driver has to
translate I/O requests into the new transport mode control words (TCW)
instead of the traditional (command mode) CCW requests.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 18 insertions, 7 deletions

diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index 20676cdef4a5..219bee7bd77c 100644
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -646,14 +646,16 @@ static int reset_summary_unit_check(struct alias_lcu *lcu,
 {
         struct dasd_ccw_req *cqr;
         int rc = 0;
+        struct ccw1 *ccw;
 
         cqr = lcu->rsu_cqr;
         strncpy((char *) &cqr->magic, "ECKD", 4);
         ASCEBC((char *) &cqr->magic, 4);
-        cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RSCK;
-        cqr->cpaddr->flags = 0 ;
-        cqr->cpaddr->count = 16;
-        cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
+        ccw = cqr->cpaddr;
+        ccw->cmd_code = DASD_ECKD_CCW_RSCK;
+        ccw->flags = 0 ;
+        ccw->count = 16;
+        ccw->cda = (__u32)(addr_t) cqr->data;
         ((char *)cqr->data)[0] = reason;
 
         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
@@ -855,12 +857,21 @@ void dasd_alias_handle_summary_unit_check(struct dasd_device *device,
         struct alias_lcu *lcu;
         char reason;
         struct dasd_eckd_private *private;
+        char *sense;
 
         private = (struct dasd_eckd_private *) device->private;
 
-        reason = irb->ecw[8];
-        DEV_MESSAGE(KERN_WARNING, device, "%s %x",
-                    "eckd handle summary unit check: reason", reason);
+        sense = dasd_get_sense(irb);
+        if (sense) {
+                reason = sense[8];
+                DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
+                            "eckd handle summary unit check: reason", reason);
+        } else {
+                DBF_DEV_EVENT(DBF_WARNING, device, "%s",
+                            "eckd handle summary unit check:"
+                            " no reason code available");
+                return;
+        }
 
         lcu = private->lcu;
         if (!lcu) {