[PATCH v4 2/3] block: sed-opal: Implement IOC_OPAL_REVERT_LSP

[gjoyce at linux.vnet.ibm.com]

From: Greg Joyce <gjoyce at linux.vnet.ibm.com>

This is used in conjunction with IOC_OPAL_REVERT_TPR to return a drive to
Original Factory State without erasing the data. If IOC_OPAL_REVERT_LSP
is called with opal_revert_lsp.options bit OPAL_PRESERVE set prior
to calling IOC_OPAL_REVERT_TPR, the drive global locking range will not
be erased.

Signed-off-by: Greg Joyce <gjoyce at linux.vnet.ibm.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Jonathan Derrick <jonathan.derrick at linux.dev>
---
 block/opal_proto.h            |  4 ++++
 block/sed-opal.c              | 40 +++++++++++++++++++++++++++++++++++
 include/linux/sed-opal.h      |  1 +
 include/uapi/linux/sed-opal.h | 11 ++++++++++
 4 files changed, 56 insertions(+)

diff --git a/block/opal_proto.h b/block/opal_proto.h
index 7152aa1f1a49..c3b5bff0b9e4 100644
--- a/block/opal_proto.h
+++ b/block/opal_proto.h
@@ -215,6 +215,10 @@ enum opal_parameter {
 	OPAL_SUM_SET_LIST = 0x060000,
 };
 
+enum opal_revertlsp {
+	OPAL_KEEP_GLOBAL_RANGE_KEY = 0x060000,
+};
+
 /* Packets derived from:
  * TCG_Storage_Architecture_Core_Spec_v2.01_r1.00
  * Secion: 3.2.3 ComPackets, Packets & Subpackets
diff --git a/block/sed-opal.c b/block/sed-opal.c
index b55a8eb29f5b..5b277eaabbc7 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -1634,6 +1634,26 @@ static int internal_activate_user(struct opal_dev *dev, void *data)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
+static int revert_lsp(struct opal_dev *dev, void *data)
+{
+	struct opal_revert_lsp *rev = data;
+	int err;
+
+	err = cmd_start(dev, opaluid[OPAL_THISSP_UID],
+			opalmethod[OPAL_REVERTSP]);
+	add_token_u8(&err, dev, OPAL_STARTNAME);
+	add_token_u64(&err, dev, OPAL_KEEP_GLOBAL_RANGE_KEY);
+	add_token_u8(&err, dev, (rev->options & OPAL_PRESERVE) ?
+			OPAL_TRUE : OPAL_FALSE);
+	add_token_u8(&err, dev, OPAL_ENDNAME);
+	if (err) {
+		pr_debug("Error building REVERT SP command.\n");
+		return err;
+	}
+
+	return finalize_and_send(dev, parse_and_check_status);
+}
+
 static int erase_locking_range(struct opal_dev *dev, void *data)
 {
 	struct opal_session_info *session = data;
@@ -2275,6 +2295,23 @@ static int opal_get_discv(struct opal_dev *dev, struct opal_discovery *discv)
 	return discv->size; /* modified to actual length of data */
 }
 
+static int opal_revertlsp(struct opal_dev *dev, struct opal_revert_lsp *rev)
+{
+	/* controller will terminate session */
+	const struct opal_step steps[] = {
+		{ start_admin1LSP_opal_session, &rev->key },
+		{ revert_lsp, rev }
+	};
+	int ret;
+
+	mutex_lock(&dev->dev_lock);
+	setup_opal_dev(dev);
+	ret = execute_steps(dev, steps, ARRAY_SIZE(steps));
+	mutex_unlock(&dev->dev_lock);
+
+	return ret;
+}
+
 static int opal_erase_locking_range(struct opal_dev *dev,
 				    struct opal_session_info *opal_session)
 {
@@ -2842,6 +2879,9 @@ int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *arg)
 	case IOC_OPAL_GET_STATUS:
 		ret = opal_get_status(dev, arg);
 		break;
+	case IOC_OPAL_REVERT_LSP:
+		ret = opal_revertlsp(dev, p);
+		break;
 	case IOC_OPAL_DISCOVERY:
 		ret = opal_get_discv(dev, p);
 		break;
diff --git a/include/linux/sed-opal.h b/include/linux/sed-opal.h
index 8e824ab908e9..bf2f9d7e11eb 100644
--- a/include/linux/sed-opal.h
+++ b/include/linux/sed-opal.h
@@ -46,6 +46,7 @@ static inline bool is_sed_ioctl(unsigned int cmd)
 	case IOC_OPAL_GENERIC_TABLE_RW:
 	case IOC_OPAL_GET_STATUS:
 	case IOC_OPAL_DISCOVERY:
+	case IOC_OPAL_REVERT_LSP:
 		return true;
 	}
 	return false;
diff --git a/include/uapi/linux/sed-opal.h b/include/uapi/linux/sed-opal.h
index 98f216cf2241..720725f1c42a 100644
--- a/include/uapi/linux/sed-opal.h
+++ b/include/uapi/linux/sed-opal.h
@@ -56,6 +56,10 @@ struct opal_key {
 	__u8 key[OPAL_KEY_MAX];
 };
 
+enum opal_revert_lsp_opts {
+	OPAL_PRESERVE = 0x01,
+};
+
 struct opal_lr_act {
 	struct opal_key key;
 	__u32 sum;
@@ -156,6 +160,12 @@ struct opal_discovery {
 	__u64 size;
 };
 
+struct opal_revert_lsp {
+	struct opal_key key;
+	__u32 options;
+	__u32 __pad;
+};
+
 #define IOC_OPAL_SAVE		    _IOW('p', 220, struct opal_lock_unlock)
 #define IOC_OPAL_LOCK_UNLOCK	    _IOW('p', 221, struct opal_lock_unlock)
 #define IOC_OPAL_TAKE_OWNERSHIP	    _IOW('p', 222, struct opal_key)
@@ -174,5 +184,6 @@ struct opal_discovery {
 #define IOC_OPAL_GENERIC_TABLE_RW   _IOW('p', 235, struct opal_read_write_table)
 #define IOC_OPAL_GET_STATUS         _IOR('p', 236, struct opal_status)
 #define IOC_OPAL_DISCOVERY          _IOW('p', 237, struct opal_discovery)
+#define IOC_OPAL_REVERT_LSP         _IOW('p', 238, struct opal_revert_lsp)
 
 #endif /* _UAPI_SED_OPAL_H */
-- 
gjoyce at linux.vnet.ibm.com