qdio: support asynchronous delivery of storage blocks

This patch introduces support for asynchronous delivery of storage blocks for
Hipersockets. Upper layers may exploit this functionality to reuse SBALs for
which the delivery status is still pending.

Signed-off-by: Einar Lueck <elelueck@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 78 insertions, 5 deletions

diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c
index 89107d0938c4..dd8bd670a6b8 100644
--- a/drivers/s390/cio/qdio_setup.c
+++ b/drivers/s390/cio/qdio_setup.c
@@ -19,6 +19,22 @@
 #include "qdio_debug.h"
 
 static struct kmem_cache *qdio_q_cache;
+static struct kmem_cache *qdio_aob_cache;
+
+struct qaob *qdio_allocate_aob()
+{
+	struct qaob *aob;
+
+	aob = kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
+	return aob;
+}
+EXPORT_SYMBOL_GPL(qdio_allocate_aob);
+
+void qdio_release_aob(struct qaob *aob)
+{
+	kmem_cache_free(qdio_aob_cache, aob);
+}
+EXPORT_SYMBOL_GPL(qdio_release_aob);
 
 /*
  * qebsm is only available under 64bit but the adapter sets the feature
@@ -154,29 +170,36 @@ static void setup_queues(struct qdio_irq *irq_ptr,
 	struct qdio_q *q;
 	void **input_sbal_array = qdio_init->input_sbal_addr_array;
 	void **output_sbal_array = qdio_init->output_sbal_addr_array;
+	struct qdio_outbuf_state *output_sbal_state_array =
+				  qdio_init->output_sbal_state_array;
 	int i;
 
 	for_each_input_queue(irq_ptr, q, i) {
-		DBF_EVENT("in-q:%1d", i);
+		DBF_EVENT("inq:%1d", i);
 		setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 
 		q->is_input_q = 1;
-		q->u.in.queue_start_poll = qdio_init->queue_start_poll;
+		q->u.in.queue_start_poll = qdio_init->queue_start_poll[i];
+
 		setup_storage_lists(q, irq_ptr, input_sbal_array, i);
 		input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 
-		if (is_thinint_irq(irq_ptr))
+		if (is_thinint_irq(irq_ptr)) {
 			tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 				     (unsigned long) q);
-		else
+		} else {
 			tasklet_init(&q->tasklet, qdio_inbound_processing,
 				     (unsigned long) q);
+		}
 	}
 
 	for_each_output_queue(irq_ptr, q, i) {
 		DBF_EVENT("outq:%1d", i);
 		setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 
+		q->u.out.sbal_state = output_sbal_state_array;
+		output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
+
 		q->is_input_q = 0;
 		q->u.out.scan_threshold = qdio_init->scan_threshold;
 		setup_storage_lists(q, irq_ptr, output_sbal_array, i);
@@ -311,6 +334,19 @@ void qdio_release_memory(struct qdio_irq *irq_ptr)
 	for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 		q = irq_ptr->output_qs[i];
 		if (q) {
+			if (q->u.out.use_cq) {
+				int n;
+
+				for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
+					struct qaob *aob = q->u.out.aobs[n];
+					if (aob) {
+						qdio_release_aob(aob);
+						q->u.out.aobs[n] = NULL;
+					}
+				}
+
+				qdio_disable_async_operation(&q->u.out);
+			}
 			free_page((unsigned long) q->slib);
 			kmem_cache_free(qdio_q_cache, q);
 		}
@@ -465,23 +501,60 @@ void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 	printk(KERN_INFO "%s", s);
 }
 
+int qdio_enable_async_operation(struct qdio_output_q *outq)
+{
+	outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
+			     GFP_ATOMIC);
+	if (!outq->aobs) {
+		outq->use_cq = 0;
+		return -ENOMEM;
+	}
+	outq->use_cq = 1;
+	return 0;
+}
+
+void qdio_disable_async_operation(struct qdio_output_q *q)
+{
+	kfree(q->aobs);
+	q->aobs = NULL;
+	q->use_cq = 0;
+}
+
 int __init qdio_setup_init(void)
 {
+	int rc;
+
 	qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 					 256, 0, NULL);
 	if (!qdio_q_cache)
 		return -ENOMEM;
 
+	qdio_aob_cache = kmem_cache_create("qdio_aob",
+					sizeof(struct qaob),
+					sizeof(struct qaob),
+					0,
+					NULL);
+	if (!qdio_aob_cache) {
+		rc = -ENOMEM;
+		goto free_qdio_q_cache;
+	}
+
 	/* Check for OSA/FCP thin interrupts (bit 67). */
 	DBF_EVENT("thinint:%1d",
 		  (css_general_characteristics.aif_osa) ? 1 : 0);
 
 	/* Check for QEBSM support in general (bit 58). */
 	DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
-	return 0;
+	rc = 0;
+out:
+	return rc;
+free_qdio_q_cache:
+	kmem_cache_destroy(qdio_q_cache);
+	goto out;
 }
 
 void qdio_setup_exit(void)
 {
+	kmem_cache_destroy(qdio_aob_cache);
 	kmem_cache_destroy(qdio_q_cache);
 }