[SCSI] zfcp: Enable data division support for FCP devices

Try to enable data division support for FCP devices and indicate in
the adapter status flag if it succeeded.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

3 files changed, 13 insertions, 1 deletions

diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c
index 6326b67c45d2..34c7e4046df4 100644
--- a/drivers/s390/cio/qdio_setup.c
+++ b/drivers/s390/cio/qdio_setup.c
@@ -368,6 +368,8 @@ static void setup_qib(struct qdio_irq *irq_ptr,
         if (qebsm_possible())
                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 
+        irq_ptr->qib.rflags |= init_data->qib_rflags;
+
         irq_ptr->qib.qfmt = init_data->q_format;
         if (init_data->no_input_qs)
                 irq_ptr->qib.isliba =
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index cb3640c6477c..6c6374ba1807 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -77,6 +77,7 @@ struct zfcp_reqlist;
 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
+#define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED    0x00000400
 
 /* remote port status */
 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index a638278c6025..c4559b29bebc 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -283,6 +283,7 @@ static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
         id->q_format = QDIO_ZFCP_QFMT;
         memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
         ASCEBC(id->adapter_name, 8);
+        id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
         id->qib_param_field_format = 0;
         id->qib_param_field = NULL;
         id->input_slib_elements = NULL;
@@ -294,8 +295,8 @@ static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
         id->int_parm = (unsigned long) qdio;
         id->input_sbal_addr_array = (void **) (qdio->res_q);
         id->output_sbal_addr_array = (void **) (qdio->req_q);
-
 }
+
 /**
  * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
  * @adapter: pointer to struct zfcp_adapter
@@ -358,6 +359,7 @@ int zfcp_qdio_open(struct zfcp_qdio *qdio)
         struct qdio_initialize init_data;
         struct zfcp_adapter *adapter = qdio->adapter;
         struct ccw_device *cdev = adapter->ccw_device;
+        struct qdio_ssqd_desc ssqd;
         int cc;
 
         if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
@@ -368,6 +370,13 @@ int zfcp_qdio_open(struct zfcp_qdio *qdio)
         if (qdio_establish(&init_data))
                 goto failed_establish;
 
+        if (qdio_get_ssqd_desc(init_data.cdev, &ssqd))
+                goto failed_qdio;
+
+        if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
+                atomic_set_mask(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
+                                &qdio->adapter->status);
+
         if (qdio_activate(cdev))
                 goto failed_qdio;