nvme: Move opcode string helper functions declarations

Move the declaration of all helper functions converting NVMe command
opcodes and status codes into strings from drivers/nvme/host/nvme.h
into include/linux/nvme.h, together with the commands definitions.
This allows NVMe target drivers to call these functions without having
to include a host header file.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Rick Wertenbroek <rick.wertenbroek@gmail.com>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Keith Busch <kbusch@kernel.org>

drivers/nvme/host/nvme.h

@@ -1182,43 +1182,4 @@ static inline bool nvme_multi_css(struct nvme_ctrl *ctrl)
 	return (ctrl->ctrl_config & NVME_CC_CSS_MASK) == NVME_CC_CSS_CSI;
 }
 
-#ifdef CONFIG_NVME_VERBOSE_ERRORS
-const char *nvme_get_error_status_str(u16 status);
-const char *nvme_get_opcode_str(u8 opcode);
-const char *nvme_get_admin_opcode_str(u8 opcode);
-const char *nvme_get_fabrics_opcode_str(u8 opcode);
-#else /* CONFIG_NVME_VERBOSE_ERRORS */
-static inline const char *nvme_get_error_status_str(u16 status)
-{
-	return "I/O Error";
-}
-static inline const char *nvme_get_opcode_str(u8 opcode)
-{
-	return "I/O Cmd";
-}
-static inline const char *nvme_get_admin_opcode_str(u8 opcode)
-{
-	return "Admin Cmd";
-}
-
-static inline const char *nvme_get_fabrics_opcode_str(u8 opcode)
-{
-	return "Fabrics Cmd";
-}
-#endif /* CONFIG_NVME_VERBOSE_ERRORS */
-
-static inline const char *nvme_opcode_str(int qid, u8 opcode)
-{
-	return qid ? nvme_get_opcode_str(opcode) :
-		nvme_get_admin_opcode_str(opcode);
-}
-
-static inline const char *nvme_fabrics_opcode_str(
-		int qid, const struct nvme_command *cmd)
-{
-	if (nvme_is_fabrics(cmd))
-		return nvme_get_fabrics_opcode_str(cmd->fabrics.fctype);
-
-	return nvme_opcode_str(qid, cmd->common.opcode);
-}
 #endif /* _NVME_H */

include/linux/nvme.h

@@ -1896,6 +1896,46 @@ static inline bool nvme_is_fabrics(const struct nvme_command *cmd)
 	return cmd->common.opcode == nvme_fabrics_command;
 }
 
+#ifdef CONFIG_NVME_VERBOSE_ERRORS
+const char *nvme_get_error_status_str(u16 status);
+const char *nvme_get_opcode_str(u8 opcode);
+const char *nvme_get_admin_opcode_str(u8 opcode);
+const char *nvme_get_fabrics_opcode_str(u8 opcode);
+#else /* CONFIG_NVME_VERBOSE_ERRORS */
+static inline const char *nvme_get_error_status_str(u16 status)
+{
+	return "I/O Error";
+}
+static inline const char *nvme_get_opcode_str(u8 opcode)
+{
+	return "I/O Cmd";
+}
+static inline const char *nvme_get_admin_opcode_str(u8 opcode)
+{
+	return "Admin Cmd";
+}
+
+static inline const char *nvme_get_fabrics_opcode_str(u8 opcode)
+{
+	return "Fabrics Cmd";
+}
+#endif /* CONFIG_NVME_VERBOSE_ERRORS */
+
+static inline const char *nvme_opcode_str(int qid, u8 opcode)
+{
+	return qid ? nvme_get_opcode_str(opcode) :
+		nvme_get_admin_opcode_str(opcode);
+}
+
+static inline const char *nvme_fabrics_opcode_str(
+		int qid, const struct nvme_command *cmd)
+{
+	if (nvme_is_fabrics(cmd))
+		return nvme_get_fabrics_opcode_str(cmd->fabrics.fctype);
+
+	return nvme_opcode_str(qid, cmd->common.opcode);
+}
+
 struct nvme_error_slot {
 	__le64		error_count;
 	__le16		sqid;