1 files changed, 100 insertions, 114 deletions

diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index 28117e130e2c..b2635759721c 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -30,12 +30,15 @@ static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
 	return 0;
 }
 
-static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id)
+static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id,
+				    unsigned int qdio_err)
 {
 	struct zfcp_adapter *adapter = qdio->adapter;
 
 	dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
 
+	if (qdio_err & QDIO_ERROR_SLSB_STATE)
+		zfcp_qdio_siosl(adapter);
 	zfcp_erp_adapter_reopen(adapter,
 				ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 				ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
@@ -55,72 +58,47 @@ static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
 static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
 {
 	unsigned long long now, span;
-	int free, used;
+	int used;
 
 	spin_lock(&qdio->stat_lock);
 	now = get_clock_monotonic();
 	span = (now - qdio->req_q_time) >> 12;
-	free = atomic_read(&qdio->req_q.count);
-	used = QDIO_MAX_BUFFERS_PER_Q - free;
+	used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
 	qdio->req_q_util += used * span;
 	qdio->req_q_time = now;
 	spin_unlock(&qdio->stat_lock);
 }
 
 static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
-			      int queue_no, int first, int count,
+			      int queue_no, int idx, int count,
 			      unsigned long parm)
 {
 	struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
-	struct zfcp_qdio_queue *queue = &qdio->req_q;
 
 	if (unlikely(qdio_err)) {
-		zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, first,
-					count);
-		zfcp_qdio_handler_error(qdio, "qdireq1");
+		zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
+		zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
 		return;
 	}
 
 	/* cleanup all SBALs being program-owned now */
-	zfcp_qdio_zero_sbals(queue->sbal, first, count);
+	zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
 
 	zfcp_qdio_account(qdio);
-	atomic_add(count, &queue->count);
+	atomic_add(count, &qdio->req_q_free);
 	wake_up(&qdio->req_q_wq);
 }
 
-static void zfcp_qdio_resp_put_back(struct zfcp_qdio *qdio, int processed)
-{
-	struct zfcp_qdio_queue *queue = &qdio->resp_q;
-	struct ccw_device *cdev = qdio->adapter->ccw_device;
-	u8 count, start = queue->first;
-	unsigned int retval;
-
-	count = atomic_read(&queue->count) + processed;
-
-	retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count);
-
-	if (unlikely(retval)) {
-		atomic_set(&queue->count, count);
-		zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdrpb_1", NULL);
-	} else {
-		queue->first += count;
-		queue->first %= QDIO_MAX_BUFFERS_PER_Q;
-		atomic_set(&queue->count, 0);
-	}
-}
-
 static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
-			       int queue_no, int first, int count,
+			       int queue_no, int idx, int count,
 			       unsigned long parm)
 {
 	struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
 	int sbal_idx, sbal_no;
 
 	if (unlikely(qdio_err)) {
-		zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, first,
-					count);
-		zfcp_qdio_handler_error(qdio, "qdires1");
+		zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
+		zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
 		return;
 	}
 
@@ -129,25 +107,16 @@ static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
 	 * returned by QDIO layer
 	 */
 	for (sbal_no = 0; sbal_no < count; sbal_no++) {
-		sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
+		sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
 		/* go through all SBALEs of SBAL */
 		zfcp_fsf_reqid_check(qdio, sbal_idx);
 	}
 
 	/*
-	 * put range of SBALs back to response queue
-	 * (including SBALs which have already been free before)
+	 * put SBALs back to response queue
 	 */
-	zfcp_qdio_resp_put_back(qdio, count);
-}
-
-static void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio,
-				 struct zfcp_qdio_req *q_req, int max_sbals)
-{
-	int count = atomic_read(&qdio->req_q.count);
-	count = min(count, max_sbals);
-	q_req->sbal_limit = (q_req->sbal_first + count - 1)
-					% QDIO_MAX_BUFFERS_PER_Q;
+	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
+		zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2", NULL);
 }
 
 static struct qdio_buffer_element *
@@ -173,6 +142,7 @@ zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
 
 	/* keep this requests number of SBALs up-to-date */
 	q_req->sbal_number++;
+	BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
 
 	/* start at first SBALE of new SBAL */
 	q_req->sbale_curr = 0;
@@ -193,17 +163,6 @@ zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
 	return zfcp_qdio_sbale_curr(qdio, q_req);
 }
 
-static void zfcp_qdio_undo_sbals(struct zfcp_qdio *qdio,
-				 struct zfcp_qdio_req *q_req)
-{
-	struct qdio_buffer **sbal = qdio->req_q.sbal;
-	int first = q_req->sbal_first;
-	int last = q_req->sbal_last;
-	int count = (last - first + QDIO_MAX_BUFFERS_PER_Q) %
-		QDIO_MAX_BUFFERS_PER_Q + 1;
-	zfcp_qdio_zero_sbals(sbal, first, count);
-}
-
 /**
  * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
  * @qdio: pointer to struct zfcp_qdio
@@ -213,14 +172,11 @@ static void zfcp_qdio_undo_sbals(struct zfcp_qdio *qdio,
  * Returns: number of bytes, or error (negativ)
  */
 int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
-			    struct scatterlist *sg, int max_sbals)
+			    struct scatterlist *sg)
 {
 	struct qdio_buffer_element *sbale;
 	int bytes = 0;
 
-	/* figure out last allowed SBAL */
-	zfcp_qdio_sbal_limit(qdio, q_req, max_sbals);
-
 	/* set storage-block type for this request */
 	sbale = zfcp_qdio_sbale_req(qdio, q_req);
 	sbale->flags |= q_req->sbtype;
@@ -229,7 +185,8 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
 		sbale = zfcp_qdio_sbale_next(qdio, q_req);
 		if (!sbale) {
 			atomic_inc(&qdio->req_q_full);
-			zfcp_qdio_undo_sbals(qdio, q_req);
+			zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
+					     q_req->sbal_number);
 			return -EINVAL;
 		}
 
@@ -239,19 +196,14 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
 		bytes += sg->length;
 	}
 
-	/* assume that no other SBALEs are to follow in the same SBAL */
-	sbale = zfcp_qdio_sbale_curr(qdio, q_req);
-	sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
-
 	return bytes;
 }
 
 static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
 {
-	struct zfcp_qdio_queue *req_q = &qdio->req_q;
-
 	spin_lock_bh(&qdio->req_q_lock);
-	if (atomic_read(&req_q->count))
+	if (atomic_read(&qdio->req_q_free) ||
+	    !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
 		return 1;
 	spin_unlock_bh(&qdio->req_q_lock);
 	return 0;
@@ -274,8 +226,13 @@ int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
 	spin_unlock_bh(&qdio->req_q_lock);
 	ret = wait_event_interruptible_timeout(qdio->req_q_wq,
 			       zfcp_qdio_sbal_check(qdio), 5 * HZ);
+
+	if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
+		return -EIO;
+
 	if (ret > 0)
 		return 0;
+
 	if (!ret) {
 		atomic_inc(&qdio->req_q_full);
 		/* assume hanging outbound queue, try queue recovery */
@@ -294,25 +251,25 @@ int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
  */
 int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
 {
-	struct zfcp_qdio_queue *req_q = &qdio->req_q;
-	int first = q_req->sbal_first;
-	int count = q_req->sbal_number;
 	int retval;
-	unsigned int qdio_flags = QDIO_FLAG_SYNC_OUTPUT;
+	u8 sbal_number = q_req->sbal_number;
 
 	zfcp_qdio_account(qdio);
 
-	retval = do_QDIO(qdio->adapter->ccw_device, qdio_flags, 0, first,
-			 count);
+	retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
+			 q_req->sbal_first, sbal_number);
+
 	if (unlikely(retval)) {
-		zfcp_qdio_zero_sbals(req_q->sbal, first, count);
+		zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
+				     sbal_number);
 		return retval;
 	}
 
 	/* account for transferred buffers */
-	atomic_sub(count, &req_q->count);
-	req_q->first += count;
-	req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
+	atomic_sub(sbal_number, &qdio->req_q_free);
+	qdio->req_q_idx += sbal_number;
+	qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
+
 	return 0;
 }
 
@@ -325,6 +282,7 @@ 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;
@@ -334,10 +292,10 @@ static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
 	id->input_handler = zfcp_qdio_int_resp;
 	id->output_handler = zfcp_qdio_int_req;
 	id->int_parm = (unsigned long) qdio;
-	id->input_sbal_addr_array = (void **) (qdio->resp_q.sbal);
-	id->output_sbal_addr_array = (void **) (qdio->req_q.sbal);
-
+	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
@@ -348,8 +306,8 @@ static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
 {
 	struct qdio_initialize init_data;
 
-	if (zfcp_qdio_buffers_enqueue(qdio->req_q.sbal) ||
-	    zfcp_qdio_buffers_enqueue(qdio->resp_q.sbal))
+	if (zfcp_qdio_buffers_enqueue(qdio->req_q) ||
+	    zfcp_qdio_buffers_enqueue(qdio->res_q))
 		return -ENOMEM;
 
 	zfcp_qdio_setup_init_data(&init_data, qdio);
@@ -363,32 +321,30 @@ static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
  */
 void zfcp_qdio_close(struct zfcp_qdio *qdio)
 {
-	struct zfcp_qdio_queue *req_q;
-	int first, count;
+	struct zfcp_adapter *adapter = qdio->adapter;
+	int idx, count;
 
-	if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
+	if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
 		return;
 
 	/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
-	req_q = &qdio->req_q;
 	spin_lock_bh(&qdio->req_q_lock);
-	atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
+	atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
 	spin_unlock_bh(&qdio->req_q_lock);
 
-	qdio_shutdown(qdio->adapter->ccw_device,
-		      QDIO_FLAG_CLEANUP_USING_CLEAR);
+	wake_up(&qdio->req_q_wq);
+
+	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
 
 	/* cleanup used outbound sbals */
-	count = atomic_read(&req_q->count);
+	count = atomic_read(&qdio->req_q_free);
 	if (count < QDIO_MAX_BUFFERS_PER_Q) {
-		first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q;
+		idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
 		count = QDIO_MAX_BUFFERS_PER_Q - count;
-		zfcp_qdio_zero_sbals(req_q->sbal, first, count);
+		zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
 	}
-	req_q->first = 0;
-	atomic_set(&req_q->count, 0);
-	qdio->resp_q.first = 0;
-	atomic_set(&qdio->resp_q.count, 0);
+	qdio->req_q_idx = 0;
+	atomic_set(&qdio->req_q_free, 0);
 }
 
 /**
@@ -400,34 +356,45 @@ int zfcp_qdio_open(struct zfcp_qdio *qdio)
 {
 	struct qdio_buffer_element *sbale;
 	struct qdio_initialize init_data;
-	struct ccw_device *cdev = qdio->adapter->ccw_device;
+	struct zfcp_adapter *adapter = qdio->adapter;
+	struct ccw_device *cdev = adapter->ccw_device;
+	struct qdio_ssqd_desc ssqd;
 	int cc;
 
-	if (atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
+	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
 		return -EIO;
 
+	atomic_clear_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
+			  &qdio->adapter->status);
+
 	zfcp_qdio_setup_init_data(&init_data, 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;
 
 	for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
-		sbale = &(qdio->resp_q.sbal[cc]->element[0]);
+		sbale = &(qdio->res_q[cc]->element[0]);
 		sbale->length = 0;
 		sbale->flags = SBAL_FLAGS_LAST_ENTRY;
 		sbale->addr = NULL;
 	}
 
-	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0,
-		     QDIO_MAX_BUFFERS_PER_Q))
+	if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
 		goto failed_qdio;
 
 	/* set index of first avalable SBALS / number of available SBALS */
-	qdio->req_q.first = 0;
-	atomic_set(&qdio->req_q.count, QDIO_MAX_BUFFERS_PER_Q);
+	qdio->req_q_idx = 0;
+	atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
 
 	return 0;
 
@@ -441,7 +408,6 @@ failed_establish:
 
 void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
 {
-	struct qdio_buffer **sbal_req, **sbal_resp;
 	int p;
 
 	if (!qdio)
@@ -450,12 +416,9 @@ void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
 	if (qdio->adapter->ccw_device)
 		qdio_free(qdio->adapter->ccw_device);
 
-	sbal_req = qdio->req_q.sbal;
-	sbal_resp = qdio->resp_q.sbal;
-
 	for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
-		free_page((unsigned long) sbal_req[p]);
-		free_page((unsigned long) sbal_resp[p]);
+		free_page((unsigned long) qdio->req_q[p]);
+		free_page((unsigned long) qdio->res_q[p]);
 	}
 
 	kfree(qdio);
@@ -483,3 +446,26 @@ int zfcp_qdio_setup(struct zfcp_adapter *adapter)
 	return 0;
 }
 
+/**
+ * zfcp_qdio_siosl - Trigger logging in FCP channel
+ * @adapter: The zfcp_adapter where to trigger logging
+ *
+ * Call the cio siosl function to trigger hardware logging.  This
+ * wrapper function sets a flag to ensure hardware logging is only
+ * triggered once before going through qdio shutdown.
+ *
+ * The triggers are always run from qdio tasklet context, so no
+ * additional synchronization is necessary.
+ */
+void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
+{
+	int rc;
+
+	if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
+		return;
+
+	rc = ccw_device_siosl(adapter->ccw_device);
+	if (!rc)
+		atomic_set_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
+				&adapter->status);
+}