s390/qdio: consolidate QIB code

Move all QIB-related code into qdio_setup_qib(), and slightly re-order
it according to the order of the struct's fields. This makes it easier
to understand what the QIB actually looks like before we send it to HW.

Also get rid of the qebsm_possible() helper - as 31-bit support is long
gone, the comment doesn't make any sense. And while removing some stale
QIB-related comment, also move the clearing of the QDR into its proper
place.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

drivers/s390/cio/qdio_setup.c

@@ -89,22 +89,11 @@ void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
 }
 EXPORT_SYMBOL_GPL(qdio_reset_buffers);
 
-/*
- * qebsm is only available under 64bit but the adapter sets the feature
- * flag anyway, so we manually override it.
- */
-static inline int qebsm_possible(void)
-{
-	return css_general_characteristics.qebsm;
-}
-
 /*
  * qib_param_field: pointer to 128 bytes or NULL, if no param field
  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
  */
 static void set_impl_params(struct qdio_irq *irq_ptr,
-			    unsigned int qib_param_field_format,
-			    unsigned char *qib_param_field,
 			    unsigned long *input_slib_elements,
 			    unsigned long *output_slib_elements)
 {
@@ -114,11 +103,6 @@ static void set_impl_params(struct qdio_irq *irq_ptr,
 	if (!irq_ptr)
 		return;
 
-	irq_ptr->qib.pfmt = qib_param_field_format;
-	if (qib_param_field)
-		memcpy(irq_ptr->qib.parm, qib_param_field,
-		       sizeof(irq_ptr->qib.parm));
-
 	if (!input_slib_elements)
 		goto output;
 
@@ -369,6 +353,8 @@ static void setup_qdr(struct qdio_irq *irq_ptr,
 	struct qdesfmt0 *desc = &irq_ptr->qdr->qdf0[0];
 	int i;
 
+	memset(irq_ptr->qdr, 0, sizeof(struct qdr));
+
 	irq_ptr->qdr->qfmt = qdio_init->q_format;
 	irq_ptr->qdr->ac = qdio_init->qdr_ac;
 	irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
@@ -388,12 +374,15 @@ static void setup_qdr(struct qdio_irq *irq_ptr,
 static void setup_qib(struct qdio_irq *irq_ptr,
 		      struct qdio_initialize *init_data)
 {
-	if (qebsm_possible())
-		irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
-
-	irq_ptr->qib.rflags |= init_data->qib_rflags;
+	memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 
 	irq_ptr->qib.qfmt = init_data->q_format;
+	irq_ptr->qib.pfmt = init_data->qib_param_field_format;
+
+	irq_ptr->qib.rflags = init_data->qib_rflags;
+	if (css_general_characteristics.qebsm)
+		irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
+
 	if (init_data->no_input_qs)
 		irq_ptr->qib.isliba =
 			(unsigned long)(irq_ptr->input_qs[0]->slib);
@@ -402,6 +391,10 @@ static void setup_qib(struct qdio_irq *irq_ptr,
 			(unsigned long)(irq_ptr->output_qs[0]->slib);
 	memcpy(irq_ptr->qib.ebcnam, dev_name(&irq_ptr->cdev->dev), 8);
 	ASCEBC(irq_ptr->qib.ebcnam, 8);
+
+	if (init_data->qib_param_field)
+		memcpy(irq_ptr->qib.parm, init_data->qib_param_field,
+		       sizeof(irq_ptr->qib.parm));
 }
 
 int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
@@ -409,7 +402,6 @@ int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
 	struct ccw_device *cdev = irq_ptr->cdev;
 	struct ciw *ciw;
 
-	memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 	irq_ptr->qdioac1 = 0;
 	memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 	memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
@@ -419,9 +411,6 @@ int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
 	irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
 	irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
 
-	/* wipes qib.ac, required by ar7063 */
-	memset(irq_ptr->qdr, 0, sizeof(struct qdr));
-
 	irq_ptr->int_parm = init_data->int_parm;
 	irq_ptr->nr_input_qs = init_data->no_input_qs;
 	irq_ptr->nr_output_qs = init_data->no_output_qs;
@@ -432,8 +421,7 @@ int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
 	set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
 
 	setup_qib(irq_ptr, init_data);
-	set_impl_params(irq_ptr, init_data->qib_param_field_format,
-			init_data->qib_param_field,
+	set_impl_params(irq_ptr,
 			init_data->input_slib_elements,
 			init_data->output_slib_elements);
 
@@ -517,7 +505,7 @@ int __init qdio_setup_init(void)
 		  (css_general_characteristics.aif_osa) ? 1 : 0);
 
 	/* Check for QEBSM support in general (bit 58). */
-	DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
+	DBF_EVENT("cssQEBSM:%1d", css_general_characteristics.qebsm);
 	rc = 0;
 out:
 	return rc;