NVME Encapsulation support for Trimode HBA

This adds support to emulate NVME functionality for the drives
connected on Trimode HBA. Userspace tools can talk to the NVME
device through passthrough commands, e.g., nvme-cli can identify
controller using `nvme id-ctrl /dev/sdX`.

drivers/scsi/mpt3sas/mpt3sas_base.h

@@ -68,6 +68,8 @@
 #include <linux/pci.h>
 #include <linux/poll.h>
 #include <linux/irq_poll.h>
+#include <linux/nvme.h>
+#include <linux/nvme_ioctl.h>
 
 #include "mpt3sas_debug.h"
 #include "mpt3sas_trigger_diag.h"
@@ -625,6 +627,7 @@ static inline void sas_device_put(struct _sas_device *s)
 struct _pcie_device {
 	struct list_head list;
 	struct scsi_target *starget;
+	struct nvme_effects_log *nvme_elog;
 	u64	wwid;
 	u16	handle;
 	u32	device_info;
@@ -1844,6 +1847,9 @@ mpt3sas_raid_device_find_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle);
 void mpt3sas_scsih_change_queue_depth(struct scsi_device *sdev, int qdepth);
 struct _sas_device *
 __mpt3sas_get_sdev_by_rphy(struct MPT3SAS_ADAPTER *ioc, struct sas_rphy *rphy);
+struct _pcie_device *
+__mpt3sas_get_pdev_from_target(struct MPT3SAS_ADAPTER *ioc,
+	struct MPT3SAS_TARGET *tgt_priv);
 struct virtual_phy *
 mpt3sas_get_vphy_by_phy(struct MPT3SAS_ADAPTER *ioc,
 	struct hba_port *port, u32 phy);
@@ -2053,6 +2059,14 @@ void mpt3sas_destroy_debugfs(struct MPT3SAS_ADAPTER *ioc);
 void mpt3sas_init_debugfs(void);
 void mpt3sas_exit_debugfs(void);
 
+/* NVME Encapsulation */
+int mpt3_nvme_user_cmd(struct scsi_device *sdev,
+	struct nvme_passthru_cmd __user *ucmd, int is_admin);
+int mpt3_nvme_user_cmd64(struct scsi_device *sdev,
+	struct nvme_passthru_cmd64 __user *ucmd, int is_admin);
+int mpt3_nvme_get_effect_log(struct MPT3SAS_ADAPTER *ioc,
+	struct _pcie_device *pcie_device, struct nvme_effects_log *nvme_elog);
+
 /**
  * _scsih_is_pcie_scsi_device - determines if device is an pcie scsi device
  * @device_info: bitfield providing information about the device.