s390/zcrypt: Introduce new zcrypt device status API

Introduce new ioctl (ZDEVICESTATUS) to provide detailed
information, like hardware type, domains, status and functionality
of available crypto devices.
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/uapi/asm/zcrypt.h

@@ -215,6 +215,42 @@ struct ep11_urb {
 	uint64_t		resp;
 } __attribute__((packed));
 
+/**
+ * struct zcrypt_device_status
+ * @hwtype:		raw hardware type
+ * @qid:		6 bit device index, 8 bit domain
+ * @functions:		AP device function bit field 'abcdef'
+ *			a, b, c = reserved
+ *			d = CCA coprocessor
+ *			e = Accelerator
+ *			f = EP11 coprocessor
+ * @online		online status
+ * @reserved		reserved
+ */
+struct zcrypt_device_status {
+	unsigned int hwtype:8;
+	unsigned int qid:14;
+	unsigned int online:1;
+	unsigned int functions:6;
+	unsigned int reserved:3;
+};
+
+#define MAX_ZDEV_CARDIDS 64
+#define MAX_ZDEV_DOMAINS 256
+
+/**
+ * Maximum number of zcrypt devices
+ */
+#define MAX_ZDEV_ENTRIES (MAX_ZDEV_CARDIDS * MAX_ZDEV_DOMAINS)
+
+/**
+ * zcrypt_device_matrix
+ * Device matrix of all zcrypt devices
+ */
+struct zcrypt_device_matrix {
+	struct zcrypt_device_status device[MAX_ZDEV_ENTRIES];
+};
+
 #define AUTOSELECT ((unsigned int)0xFFFFFFFF)
 
 #define ZCRYPT_IOCTL_MAGIC 'z'
@@ -321,6 +357,7 @@ struct ep11_urb {
 #define ICARSACRT	_IOC(_IOC_READ|_IOC_WRITE, ZCRYPT_IOCTL_MAGIC, 0x06, 0)
 #define ZSECSENDCPRB	_IOC(_IOC_READ|_IOC_WRITE, ZCRYPT_IOCTL_MAGIC, 0x81, 0)
 #define ZSENDEP11CPRB	_IOC(_IOC_READ|_IOC_WRITE, ZCRYPT_IOCTL_MAGIC, 0x04, 0)
+#define ZDEVICESTATUS	_IOC(_IOC_READ|_IOC_WRITE, ZCRYPT_IOCTL_MAGIC, 0x4f, 0)
 
 /* New status calls */
 #define Z90STAT_TOTALCOUNT	_IOR(ZCRYPT_IOCTL_MAGIC, 0x40, int)

drivers/s390/crypto/zcrypt_api.c

@@ -539,6 +539,29 @@ static long zcrypt_rng(char *buffer)
 	return rc;
 }
 
+static void zcrypt_device_status_mask(struct zcrypt_device_matrix *matrix)
+{
+	struct zcrypt_card *zc;
+	struct zcrypt_queue *zq;
+	struct zcrypt_device_status *stat;
+
+	memset(matrix, 0, sizeof(*matrix));
+	spin_lock(&zcrypt_list_lock);
+	for_each_zcrypt_card(zc) {
+		for_each_zcrypt_queue(zq, zc) {
+			stat = matrix->device;
+			stat += AP_QID_CARD(zq->queue->qid) * MAX_ZDEV_DOMAINS;
+			stat += AP_QID_QUEUE(zq->queue->qid);
+			stat->hwtype = zc->card->ap_dev.device_type;
+			stat->functions = zc->card->functions >> 26;
+			stat->qid = zq->queue->qid;
+			stat->online = zq->online ? 0x01 : 0x00;
+		}
+	}
+	spin_unlock(&zcrypt_list_lock);
+}
+EXPORT_SYMBOL(zcrypt_device_status_mask);
+
 static void zcrypt_status_mask(char status[AP_DEVICES])
 {
 	struct zcrypt_card *zc;
@@ -764,6 +787,25 @@ static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
 			return -EFAULT;
 		return rc;
 	}
+	case ZDEVICESTATUS: {
+		struct zcrypt_device_matrix *device_status;
+
+		device_status = kzalloc(sizeof(struct zcrypt_device_matrix),
+					GFP_KERNEL);
+		if (!device_status)
+			return -ENOMEM;
+
+		zcrypt_device_status_mask(device_status);
+
+		if (copy_to_user((char __user *) arg, device_status,
+				 sizeof(struct zcrypt_device_matrix))) {
+			kfree(device_status);
+			return -EFAULT;
+		}
+
+		kfree(device_status);
+		return 0;
+	}
 	case Z90STAT_STATUS_MASK: {
 		char status[AP_DEVICES];
 		zcrypt_status_mask(status);