[PATCH v1 07/20] s390/zcrypt: New zcrypt function zcrypt_device_status_mask_ext2

[Harald Freudenberger <freude@linux.ibm.com>]

Introduce a new function zcrypt_device_status_mask_ext2().
This function gives the possibility to provide upper limits
for cards and queues. The current implementation of
zcrypt_device_status_mask_ext() needs an array of
256 * 256 * 4 = 256 KB which is huge. The new function
is more flexible in the sense that the caller can decide
the upper limit for cards and domains to be stored into
the status array. So for example a caller may decide to
only query for cards 0...127 and queues 0...127 and thus
only an array of size 128 * 128 * 4 = 64 KB is needed.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
---
 drivers/s390/crypto/zcrypt_api.c | 26 ++++++++++++++++++++++++++
 drivers/s390/crypto/zcrypt_api.h |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index 3a521e65f3fe..fd9666ae1d26 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -1330,6 +1330,32 @@ void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus)
 }
 EXPORT_SYMBOL(zcrypt_device_status_mask_ext);
 
+void zcrypt_device_status_mask_ext2(struct zcrypt_device_status_ext *devstatus,
+				    int maxcard, int maxqueue)
+{
+	struct zcrypt_card *zc;
+	struct zcrypt_queue *zq;
+	struct zcrypt_device_status_ext *stat;
+	int card, queue;
+
+	spin_lock(&zcrypt_list_lock);
+	for_each_zcrypt_card(zc) {
+		for_each_zcrypt_queue(zq, zc) {
+			card = AP_QID_CARD(zq->queue->qid);
+			queue = AP_QID_QUEUE(zq->queue->qid);
+			if (card >= maxcard || queue >= maxqueue)
+				continue;
+			stat = &devstatus[card * maxqueue + queue];
+			stat->hwtype = zc->card->ap_dev.device_type;
+			stat->functions = zc->card->hwinfo.fac >> 26;
+			stat->qid = zq->queue->qid;
+			stat->online = zq->online ? 0x01 : 0x00;
+		}
+	}
+	spin_unlock(&zcrypt_list_lock);
+}
+EXPORT_SYMBOL(zcrypt_device_status_mask_ext2);
+
 int zcrypt_device_status_ext(int card, int queue,
 			     struct zcrypt_device_status_ext *devstat)
 {
diff --git a/drivers/s390/crypto/zcrypt_api.h b/drivers/s390/crypto/zcrypt_api.h
index 06ff697d171c..92027304f0d8 100644
--- a/drivers/s390/crypto/zcrypt_api.h
+++ b/drivers/s390/crypto/zcrypt_api.h
@@ -172,6 +172,8 @@ void zcrypt_api_exit(void);
 long zcrypt_send_cprb(struct ica_xcRB *xcRB, u32 xflags);
 long zcrypt_send_ep11_cprb(struct ep11_urb *urb, u32 xflags);
 void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus);
+void zcrypt_device_status_mask_ext2(struct zcrypt_device_status_ext *devstatus,
+				    int maxcard, int maxqueue);
 int zcrypt_device_status_ext(int card, int queue,
 			     struct zcrypt_device_status_ext *devstatus);
 
-- 
2.43.0