scsi: myrb: Add Mylex RAID controller (block interface)

This patch adds support for the Mylex DAC960 RAID controller,
supporting the older, block-based interface only.  The driver is a
re-implementation of the original DAC960 driver.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

5 files changed, 4636 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 3594292ac295..99c7e6791519 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9892,6 +9892,12 @@ S:	Supported
 F:	drivers/gpu/drm/mxsfb/
 F:	Documentation/devicetree/bindings/display/mxsfb.txt
 
+MYLEX DAC960 PCI RAID Controller
+M:	Hannes Reinecke <hare@kernel.org>
+L:	linux-scsi@vger.kernel.org
+S:	Supported
+F:	drivers/scsi/myrb.*
+
 MYRICOM MYRI-10G 10GbE DRIVER (MYRI10GE)
 M:	Chris Lee <christopher.lee@cspi.com>
 L:	netdev@vger.kernel.org
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 8fc851a9e116..f2a71bb74f48 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -557,6 +557,21 @@ config SCSI_FLASHPOINT
 	  substantial, so users of MultiMaster Host Adapters may not
 	  wish to include it.
 
+config SCSI_MYRB
+	tristate "Mylex DAC960/DAC1100 PCI RAID Controller (Block Interface)"
+	depends on PCI
+	select RAID_ATTRS
+	help
+	  This driver adds support for the Mylex DAC960, AcceleRAID, and
+	  eXtremeRAID PCI RAID controllers. This driver supports the
+	  older, block based interface.
+	  This driver is a reimplementation of the original DAC960
+	  driver. If you have used the DAC960 driver you should enable
+	  this module.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called myrb.
+
 config VMWARE_PVSCSI
 	tristate "VMware PVSCSI driver support"
 	depends on PCI && SCSI && X86
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 6d71b2a9592b..cfd58ffc0b61 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -106,6 +106,7 @@ obj-$(CONFIG_SCSI_INIA100)	+= a100u2w.o
 obj-$(CONFIG_SCSI_QLOGICPTI)	+= qlogicpti.o
 obj-$(CONFIG_SCSI_MESH)		+= mesh.o
 obj-$(CONFIG_SCSI_MAC53C94)	+= mac53c94.o
+obj-$(CONFIG_SCSI_MYRB)		+= myrb.o
 obj-$(CONFIG_BLK_DEV_3W_XXXX_RAID) += 3w-xxxx.o
 obj-$(CONFIG_SCSI_3W_9XXX)	+= 3w-9xxx.o
 obj-$(CONFIG_SCSI_3W_SAS)	+= 3w-sas.o
diff --git a/drivers/scsi/myrb.c b/drivers/scsi/myrb.c
new file mode 100644
index 000000000000..aeb282f617c5
--- /dev/null
+++ b/drivers/scsi/myrb.c
@@ -0,0 +1,3656 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Linux Driver for Mylex DAC960/AcceleRAID/eXtremeRAID PCI RAID Controllers
+ *
+ * Copyright 2017 Hannes Reinecke, SUSE Linux GmbH <hare@suse.com>
+ *
+ * Based on the original DAC960 driver,
+ * Copyright 1998-2001 by Leonard N. Zubkoff <lnz@dandelion.com>
+ * Portions Copyright 2002 by Mylex (An IBM Business Unit)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/raid_class.h>
+#include <asm/unaligned.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_tcq.h>
+#include "myrb.h"
+
+static struct raid_template *myrb_raid_template;
+
+static void myrb_monitor(struct work_struct *work);
+static inline void myrb_translate_devstate(void *DeviceState);
+
+static inline int myrb_logical_channel(struct Scsi_Host *shost)
+{
+	return shost->max_channel - 1;
+}
+
+static struct myrb_devstate_name_entry {
+	enum myrb_devstate state;
+	const char *name;
+} myrb_devstate_name_list[] = {
+	{ MYRB_DEVICE_DEAD, "Dead" },
+	{ MYRB_DEVICE_WO, "WriteOnly" },
+	{ MYRB_DEVICE_ONLINE, "Online" },
+	{ MYRB_DEVICE_CRITICAL, "Critical" },
+	{ MYRB_DEVICE_STANDBY, "Standby" },
+	{ MYRB_DEVICE_OFFLINE, "Offline" },
+};
+
+static const char *myrb_devstate_name(enum myrb_devstate state)
+{
+	struct myrb_devstate_name_entry *entry = myrb_devstate_name_list;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(myrb_devstate_name_list); i++) {
+		if (entry[i].state == state)
+			return entry[i].name;
+	}
+	return "Unknown";
+}
+
+static struct myrb_raidlevel_name_entry {
+	enum myrb_raidlevel level;
+	const char *name;
+} myrb_raidlevel_name_list[] = {
+	{ MYRB_RAID_LEVEL0, "RAID0" },
+	{ MYRB_RAID_LEVEL1, "RAID1" },
+	{ MYRB_RAID_LEVEL3, "RAID3" },
+	{ MYRB_RAID_LEVEL5, "RAID5" },
+	{ MYRB_RAID_LEVEL6, "RAID6" },
+	{ MYRB_RAID_JBOD, "JBOD" },
+};
+
+static const char *myrb_raidlevel_name(enum myrb_raidlevel level)
+{
+	struct myrb_raidlevel_name_entry *entry = myrb_raidlevel_name_list;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(myrb_raidlevel_name_list); i++) {
+		if (entry[i].level == level)
+			return entry[i].name;
+	}
+	return NULL;
+}
+
+/**
+ * myrb_create_mempools - allocates auxiliary data structures
+ *
+ * Return: true on success, false otherwise.
+ */
+static bool myrb_create_mempools(struct pci_dev *pdev, struct myrb_hba *cb)
+{
+	size_t elem_size, elem_align;
+
+	elem_align = sizeof(struct myrb_sge);
+	elem_size = cb->host->sg_tablesize * elem_align;
+	cb->sg_pool = dma_pool_create("myrb_sg", &pdev->dev,
+				      elem_size, elem_align, 0);
+	if (cb->sg_pool == NULL) {
+		shost_printk(KERN_ERR, cb->host,
+			     "Failed to allocate SG pool\n");
+		return false;
+	}
+
+	cb->dcdb_pool = dma_pool_create("myrb_dcdb", &pdev->dev,
+				       sizeof(struct myrb_dcdb),
+				       sizeof(unsigned int), 0);
+	if (!cb->dcdb_pool) {
+		dma_pool_destroy(cb->sg_pool);
+		cb->sg_pool = NULL;
+		shost_printk(KERN_ERR, cb->host,
+			     "Failed to allocate DCDB pool\n");
+		return false;
+	}
+
+	snprintf(cb->work_q_name, sizeof(cb->work_q_name),
+		 "myrb_wq_%d", cb->host->host_no);
+	cb->work_q = create_singlethread_workqueue(cb->work_q_name);
+	if (!cb->work_q) {
+		dma_pool_destroy(cb->dcdb_pool);
+		cb->dcdb_pool = NULL;
+		dma_pool_destroy(cb->sg_pool);
+		cb->sg_pool = NULL;
+		shost_printk(KERN_ERR, cb->host,
+			     "Failed to create workqueue\n");
+		return false;
+	}
+
+	/*
+	 * Initialize the Monitoring Timer.
+	 */
+	INIT_DELAYED_WORK(&cb->monitor_work, myrb_monitor);
+	queue_delayed_work(cb->work_q, &cb->monitor_work, 1);
+
+	return true;
+}
+
+/**
+ * myrb_destroy_mempools - tears down the memory pools for the controller
+ */
+static void myrb_destroy_mempools(struct myrb_hba *cb)
+{
+	cancel_delayed_work_sync(&cb->monitor_work);
+	destroy_workqueue(cb->work_q);
+
+	dma_pool_destroy(cb->sg_pool);
+	dma_pool_destroy(cb->dcdb_pool);
+}
+
+/**
+ * myrb_reset_cmd - reset command block
+ */
+static inline void myrb_reset_cmd(struct myrb_cmdblk *cmd_blk)
+{
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+
+	memset(mbox, 0, sizeof(union myrb_cmd_mbox));
+	cmd_blk->status = 0;
+}
+
+/**
+ * myrb_qcmd - queues command block for execution
+ */
+static void myrb_qcmd(struct myrb_hba *cb, struct myrb_cmdblk *cmd_blk)
+{
+	void __iomem *base = cb->io_base;
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+	union myrb_cmd_mbox *next_mbox = cb->next_cmd_mbox;
+
+	cb->write_cmd_mbox(next_mbox, mbox);
+	if (cb->prev_cmd_mbox1->words[0] == 0 ||
+	    cb->prev_cmd_mbox2->words[0] == 0)
+		cb->get_cmd_mbox(base);
+	cb->prev_cmd_mbox2 = cb->prev_cmd_mbox1;
+	cb->prev_cmd_mbox1 = next_mbox;
+	if (++next_mbox > cb->last_cmd_mbox)
+		next_mbox = cb->first_cmd_mbox;
+	cb->next_cmd_mbox = next_mbox;
+}
+
+/**
+ * myrb_exec_cmd - executes command block and waits for completion.
+ *
+ * Return: command status
+ */
+static unsigned short myrb_exec_cmd(struct myrb_hba *cb,
+		struct myrb_cmdblk *cmd_blk)
+{
+	DECLARE_COMPLETION_ONSTACK(cmpl);
+	unsigned long flags;
+
+	cmd_blk->completion = &cmpl;
+
+	spin_lock_irqsave(&cb->queue_lock, flags);
+	cb->qcmd(cb, cmd_blk);
+	spin_unlock_irqrestore(&cb->queue_lock, flags);
+
+	WARN_ON(in_interrupt());
+	wait_for_completion(&cmpl);
+	return cmd_blk->status;
+}
+
+/**
+ * myrb_exec_type3 - executes a type 3 command and waits for completion.
+ *
+ * Return: command status
+ */
+static unsigned short myrb_exec_type3(struct myrb_hba *cb,
+		enum myrb_cmd_opcode op, dma_addr_t addr)
+{
+	struct myrb_cmdblk *cmd_blk = &cb->dcmd_blk;
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+	unsigned short status;
+
+	mutex_lock(&cb->dcmd_mutex);
+	myrb_reset_cmd(cmd_blk);
+	mbox->type3.id = MYRB_DCMD_TAG;
+	mbox->type3.opcode = op;
+	mbox->type3.addr = addr;
+	status = myrb_exec_cmd(cb, cmd_blk);
+	mutex_unlock(&cb->dcmd_mutex);
+	return status;
+}
+
+/**
+ * myrb_exec_type3D - executes a type 3D command and waits for completion.
+ *
+ * Return: command status
+ */
+static unsigned short myrb_exec_type3D(struct myrb_hba *cb,
+		enum myrb_cmd_opcode op, struct scsi_device *sdev,
+		struct myrb_pdev_state *pdev_info)
+{
+	struct myrb_cmdblk *cmd_blk = &cb->dcmd_blk;
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+	unsigned short status;
+	dma_addr_t pdev_info_addr;
+
+	pdev_info_addr = dma_map_single(&cb->pdev->dev, pdev_info,
+					sizeof(struct myrb_pdev_state),
+					DMA_FROM_DEVICE);
+	if (dma_mapping_error(&cb->pdev->dev, pdev_info_addr))
+		return MYRB_STATUS_SUBSYS_FAILED;
+
+	mutex_lock(&cb->dcmd_mutex);
+	myrb_reset_cmd(cmd_blk);
+	mbox->type3D.id = MYRB_DCMD_TAG;
+	mbox->type3D.opcode = op;
+	mbox->type3D.channel = sdev->channel;
+	mbox->type3D.target = sdev->id;
+	mbox->type3D.addr = pdev_info_addr;
+	status = myrb_exec_cmd(cb, cmd_blk);
+	mutex_unlock(&cb->dcmd_mutex);
+	dma_unmap_single(&cb->pdev->dev, pdev_info_addr,
+			 sizeof(struct myrb_pdev_state), DMA_FROM_DEVICE);
+	if (status == MYRB_STATUS_SUCCESS &&
+	    mbox->type3D.opcode == MYRB_CMD_GET_DEVICE_STATE_OLD)
+		myrb_translate_devstate(pdev_info);
+
+	return status;
+}
+
+static char *myrb_event_msg[] = {
+	"killed because write recovery failed",
+	"killed because of SCSI bus reset failure",
+	"killed because of double check condition",
+	"killed because it was removed",
+	"killed because of gross error on SCSI chip",
+	"killed because of bad tag returned from drive",
+	"killed because of timeout on SCSI command",
+	"killed because of reset SCSI command issued from system",
+	"killed because busy or parity error count exceeded limit",
+	"killed because of 'kill drive' command from system",
+	"killed because of selection timeout",
+	"killed due to SCSI phase sequence error",
+	"killed due to unknown status",
+};
+
+/**
+ * myrb_get_event - get event log from HBA
+ * @cb: pointer to the hba structure
+ * @event: number of the event
+ *
+ * Execute a type 3E command and logs the event message
+ */
+static void myrb_get_event(struct myrb_hba *cb, unsigned int event)
+{
+	struct myrb_cmdblk *cmd_blk = &cb->mcmd_blk;
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+	struct myrb_log_entry *ev_buf;
+	dma_addr_t ev_addr;
+	unsigned short status;
+
+	ev_buf = dma_alloc_coherent(&cb->pdev->dev,
+				    sizeof(struct myrb_log_entry),
+				    &ev_addr, GFP_KERNEL);
+	if (!ev_buf)
+		return;
+
+	myrb_reset_cmd(cmd_blk);
+	mbox->type3E.id = MYRB_MCMD_TAG;
+	mbox->type3E.opcode = MYRB_CMD_EVENT_LOG_OPERATION;
+	mbox->type3E.optype = DAC960_V1_GetEventLogEntry;
+	mbox->type3E.opqual = 1;
+	mbox->type3E.ev_seq = event;
+	mbox->type3E.addr = ev_addr;
+	status = myrb_exec_cmd(cb, cmd_blk);
+	if (status != MYRB_STATUS_SUCCESS)
+		shost_printk(KERN_INFO, cb->host,
+			     "Failed to get event log %d, status %04x\n",
+			     event, status);
+
+	else if (ev_buf->seq_num == event) {
+		struct scsi_sense_hdr sshdr;
+
+		memset(&sshdr, 0, sizeof(sshdr));
+		scsi_normalize_sense(ev_buf->sense, 32, &sshdr);
+
+		if (sshdr.sense_key == VENDOR_SPECIFIC &&
+		    sshdr.asc == 0x80 &&
+		    sshdr.ascq < ARRAY_SIZE(myrb_event_msg))
+			shost_printk(KERN_CRIT, cb->host,
+				     "Physical drive %d:%d: %s\n",
+				     ev_buf->channel, ev_buf->target,
+				     myrb_event_msg[sshdr.ascq]);
+		else
+			shost_printk(KERN_CRIT, cb->host,
+				     "Physical drive %d:%d: Sense: %X/%02X/%02X\n",
+				     ev_buf->channel, ev_buf->target,
+				     sshdr.sense_key, sshdr.asc, sshdr.ascq);
+	}
+
+	dma_free_coherent(&cb->pdev->dev, sizeof(struct myrb_log_entry),
+			  ev_buf, ev_addr);
+}
+
+/**
+ * myrb_get_errtable - retrieves the error table from the controller
+ *
+ * Executes a type 3 command and logs the error table from the controller.
+ */
+static void myrb_get_errtable(struct myrb_hba *cb)
+{
+	struct myrb_cmdblk *cmd_blk = &cb->mcmd_blk;
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+	unsigned short status;
+	struct myrb_error_entry old_table[MYRB_MAX_CHANNELS * MYRB_MAX_TARGETS];
+
+	memcpy(&old_table, cb->err_table, sizeof(old_table));
+
+	myrb_reset_cmd(cmd_blk);
+	mbox->type3.id = MYRB_MCMD_TAG;
+	mbox->type3.opcode = MYRB_CMD_GET_ERROR_TABLE;
+	mbox->type3.addr = cb->err_table_addr;
+	status = myrb_exec_cmd(cb, cmd_blk);
+	if (status == MYRB_STATUS_SUCCESS) {
+		struct myrb_error_entry *table = cb->err_table;
+		struct myrb_error_entry *new, *old;
+		size_t err_table_offset;
+		struct scsi_device *sdev;
+
+		shost_for_each_device(sdev, cb->host) {
+			if (sdev->channel >= myrb_logical_channel(cb->host))
+				continue;
+			err_table_offset = sdev->channel * MYRB_MAX_TARGETS
+				+ sdev->id;
+			new = table + err_table_offset;
+			old = &old_table[err_table_offset];
+			if (new->parity_err == old->parity_err &&
+			    new->soft_err == old->soft_err &&
+			    new->hard_err == old->hard_err &&
+			    new->misc_err == old->misc_err)
+				continue;
+			sdev_printk(KERN_CRIT, sdev,
+				    "Errors: Parity = %d, Soft = %d, Hard = %d, Misc = %d\n",
+				    new->parity_err, new->soft_err,
+				    new->hard_err, new->misc_err);
+		}
+	}
+}
+
+/**
+ * myrb_get_ldev_info - retrieves the logical device table from the controller
+ *
+ * Executes a type 3 command and updates the logical device table.
+ *
+ * Return: command status
+ */
+static unsigned short myrb_get_ldev_info(struct myrb_hba *cb)
+{
+	unsigned short status;
+	int ldev_num, ldev_cnt = cb->enquiry->ldev_count;
+	struct Scsi_Host *shost = cb->host;
+
+	status = myrb_exec_type3(cb, MYRB_CMD_GET_LDEV_INFO,
+				 cb->ldev_info_addr);
+	if (status != MYRB_STATUS_SUCCESS)
+		return status;
+
+	for (ldev_num = 0; ldev_num < ldev_cnt; ldev_num++) {
+		struct myrb_ldev_info *old = NULL;
+		struct myrb_ldev_info *new = cb->ldev_info_buf + ldev_num;
+		struct scsi_device *sdev;
+
+		sdev = scsi_device_lookup(shost, myrb_logical_channel(shost),
+					  ldev_num, 0);
+		if (!sdev) {
+			if (new->state == MYRB_DEVICE_OFFLINE)
+				continue;
+			shost_printk(KERN_INFO, shost,
+				     "Adding Logical Drive %d in state %s\n",
+				     ldev_num, myrb_devstate_name(new->state));
+			scsi_add_device(shost, myrb_logical_channel(shost),
+					ldev_num, 0);
+			continue;
+		}
+		old = sdev->hostdata;
+		if (new->state != old->state)
+			shost_printk(KERN_INFO, shost,
+				     "Logical Drive %d is now %s\n",
+				     ldev_num, myrb_devstate_name(new->state));
+		if (new->wb_enabled != old->wb_enabled)
+			sdev_printk(KERN_INFO, sdev,
+				    "Logical Drive is now WRITE %s\n",
+				    (new->wb_enabled ? "BACK" : "THRU"));
+		memcpy(old, new, sizeof(*new));
+		scsi_device_put(sdev);
+	}
+	return status;
+}
+
+/**
+ * myrb_get_rbld_progress - get rebuild progress information
+ *
+ * Executes a type 3 command and returns the rebuild progress
+ * information.
+ *
+ * Return: command status
+ */
+static unsigned short myrb_get_rbld_progress(struct myrb_hba *cb,
+		struct myrb_rbld_progress *rbld)
+{
+	struct myrb_cmdblk *cmd_blk = &cb->mcmd_blk;
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+	struct myrb_rbld_progress *rbld_buf;
+	dma_addr_t rbld_addr;
+	unsigned short status;
+
+	rbld_buf = dma_alloc_coherent(&cb->pdev->dev,
+				      sizeof(struct myrb_rbld_progress),
+				      &rbld_addr, GFP_KERNEL);
+	if (!rbld_buf)
+		return MYRB_STATUS_RBLD_NOT_CHECKED;
+
+	myrb_reset_cmd(cmd_blk);
+	mbox->type3.id = MYRB_MCMD_TAG;
+	mbox->type3.opcode = MYRB_CMD_GET_REBUILD_PROGRESS;
+	mbox->type3.addr = rbld_addr;
+	status = myrb_exec_cmd(cb, cmd_blk);
+	if (rbld)
+		memcpy(rbld, rbld_buf, sizeof(struct myrb_rbld_progress));
+	dma_free_coherent(&cb->pdev->dev, sizeof(struct myrb_rbld_progress),
+			  rbld_buf, rbld_addr);
+	return status;
+}
+
+/**
+ * myrb_update_rbld_progress - updates the rebuild status
+ *
+ * Updates the rebuild status for the attached logical devices.
+ *
+ */
+static void myrb_update_rbld_progress(struct myrb_hba *cb)
+{
+	struct myrb_rbld_progress rbld_buf;
+	unsigned short status;
+
+	status = myrb_get_rbld_progress(cb, &rbld_buf);
+	if (status == MYRB_NO_STDBY_RBLD_OR_CHECK_IN_PROGRESS &&
+	    cb->last_rbld_status == MYRB_STATUS_SUCCESS)
+		status = MYRB_STATUS_RBLD_SUCCESS;
+	if (status != MYRB_NO_STDBY_RBLD_OR_CHECK_IN_PROGRESS) {
+		unsigned int blocks_done =
+			rbld_buf.ldev_size - rbld_buf.blocks_left;
+		struct scsi_device *sdev;
+
+		sdev = scsi_device_lookup(cb->host,
+					  myrb_logical_channel(cb->host),
+					  rbld_buf.ldev_num, 0);
+		if (!sdev)
+			return;
+
+		switch (status) {
+		case MYRB_STATUS_SUCCESS:
+			sdev_printk(KERN_INFO, sdev,
+				    "Rebuild in Progress, %d%% completed\n",
+				    (100 * (blocks_done >> 7))
+				    / (rbld_buf.ldev_size >> 7));
+			break;
+		case MYRB_STATUS_RBLD_FAILED_LDEV_FAILURE:
+			sdev_printk(KERN_INFO, sdev,
+				    "Rebuild Failed due to Logical Drive Failure\n");
+			break;
+		case MYRB_STATUS_RBLD_FAILED_BADBLOCKS:
+			sdev_printk(KERN_INFO, sdev,
+				    "Rebuild Failed due to Bad Blocks on Other Drives\n");
+			break;
+		case MYRB_STATUS_RBLD_FAILED_NEW_DRIVE_FAILED:
+			sdev_printk(KERN_INFO, sdev,
+				    "Rebuild Failed due to Failure of Drive Being Rebuilt\n");
+			break;
+		case MYRB_STATUS_RBLD_SUCCESS:
+			sdev_printk(KERN_INFO, sdev,
+				    "Rebuild Completed Successfully\n");
+			break;
+		case MYRB_STATUS_RBLD_SUCCESS_TERMINATED:
+			sdev_printk(KERN_INFO, sdev,
+				     "Rebuild Successfully Terminated\n");
+			break;
+		default:
+			break;
+		}
+		scsi_device_put(sdev);
+	}
+	cb->last_rbld_status = status;
+}
+
+/**
+ * myrb_get_cc_progress - retrieve the rebuild status
+ *
+ * Execute a type 3 Command and fetch the rebuild / consistency check
+ * status.
+ */
+static void myrb_get_cc_progress(struct myrb_hba *cb)
+{
+	struct myrb_cmdblk *cmd_blk = &cb->mcmd_blk;
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+	struct myrb_rbld_progress *rbld_buf;
+	dma_addr_t rbld_addr;
+	unsigned short status;
+
+	rbld_buf = dma_alloc_coherent(&cb->pdev->dev,
+				      sizeof(struct myrb_rbld_progress),
+				      &rbld_addr, GFP_KERNEL);
+	if (!rbld_buf) {
+		cb->need_cc_status = true;
+		return;
+	}
+	myrb_reset_cmd(cmd_blk);
+	mbox->type3.id = MYRB_MCMD_TAG;
+	mbox->type3.opcode = MYRB_CMD_REBUILD_STAT;
+	mbox->type3.addr = rbld_addr;
+	status = myrb_exec_cmd(cb, cmd_blk);
+	if (status == MYRB_STATUS_SUCCESS) {
+		unsigned int ldev_num = rbld_buf->ldev_num;
+		unsigned int ldev_size = rbld_buf->ldev_size;
+		unsigned int blocks_done =
+			ldev_size - rbld_buf->blocks_left;
+		struct scsi_device *sdev;
+
+		sdev = scsi_device_lookup(cb->host,
+					  myrb_logical_channel(cb->host),
+					  ldev_num, 0);
+		if (sdev) {
+			sdev_printk(KERN_INFO, sdev,
+				    "Consistency Check in Progress: %d%% completed\n",
+				    (100 * (blocks_done >> 7))
+				    / (ldev_size >> 7));
+			scsi_device_put(sdev);
+		}
+	}
+	dma_free_coherent(&cb->pdev->dev, sizeof(struct myrb_rbld_progress),
+			  rbld_buf, rbld_addr);
+}
+
+/**
+ * myrb_bgi_control - updates background initialisation status
+ *
+ * Executes a type 3B command and updates the background initialisation status
+ */
+static void myrb_bgi_control(struct myrb_hba *cb)
+{
+	struct myrb_cmdblk *cmd_blk = &cb->mcmd_blk;
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+	struct myrb_bgi_status *bgi, *last_bgi;
+	dma_addr_t bgi_addr;
+	struct scsi_device *sdev = NULL;
+	unsigned short status;
+
+	bgi = dma_alloc_coherent(&cb->pdev->dev, sizeof(struct myrb_bgi_status),
+				 &bgi_addr, GFP_KERNEL);
+	if (!bgi) {
+		shost_printk(KERN_ERR, cb->host,
+			     "Failed to allocate bgi memory\n");
+		return;
+	}
+	myrb_reset_cmd(cmd_blk);
+	mbox->type3B.id = MYRB_DCMD_TAG;
+	mbox->type3B.opcode = MYRB_CMD_BGI_CONTROL;
+	mbox->type3B.optype = 0x20;
+	mbox->type3B.addr = bgi_addr;
+	status = myrb_exec_cmd(cb, cmd_blk);
+	last_bgi = &cb->bgi_status;
+	sdev = scsi_device_lookup(cb->host,
+				  myrb_logical_channel(cb->host),
+				  bgi->ldev_num, 0);
+	switch (status) {
+	case MYRB_STATUS_SUCCESS:
+		switch (bgi->status) {
+		case MYRB_BGI_INVALID:
+			break;
+		case MYRB_BGI_STARTED:
+			if (!sdev)
+				break;
+			sdev_printk(KERN_INFO, sdev,
+				    "Background Initialization Started\n");
+			break;
+		case MYRB_BGI_INPROGRESS:
+			if (!sdev)
+				break;
+			if (bgi->blocks_done == last_bgi->blocks_done &&
+			    bgi->ldev_num == last_bgi->ldev_num)
+				break;
+			sdev_printk(KERN_INFO, sdev,
+				 "Background Initialization in Progress: %d%% completed\n",
+				 (100 * (bgi->blocks_done >> 7))
+				 / (bgi->ldev_size >> 7));
+			break;
+		case MYRB_BGI_SUSPENDED:
+			if (!sdev)
+				break;
+			sdev_printk(KERN_INFO, sdev,
+				    "Background Initialization Suspended\n");
+			break;
+		case MYRB_BGI_CANCELLED:
+			if (!sdev)
+				break;
+			sdev_printk(KERN_INFO, sdev,
+				    "Background Initialization Cancelled\n");
+			break;
+		}
+		memcpy(&cb->bgi_status, bgi, sizeof(struct myrb_bgi_status));
+		break;
+	case MYRB_STATUS_BGI_SUCCESS:
+		if (sdev && cb->bgi_status.status == MYRB_BGI_INPROGRESS)
+			sdev_printk(KERN_INFO, sdev,
+				    "Background Initialization Completed Successfully\n");
+		cb->bgi_status.status = MYRB_BGI_INVALID;
+		break;
+	case MYRB_STATUS_BGI_ABORTED:
+		if (sdev && cb->bgi_status.status == MYRB_BGI_INPROGRESS)
+			sdev_printk(KERN_INFO, sdev,
+				    "Background Initialization Aborted\n");
+		/* Fallthrough */
+	case MYRB_STATUS_NO_BGI_INPROGRESS:
+		cb->bgi_status.status = MYRB_BGI_INVALID;
+		break;
+	}
+	if (sdev)
+		scsi_device_put(sdev);
+	dma_free_coherent(&cb->pdev->dev, sizeof(struct myrb_bgi_status),
+			  bgi, bgi_addr);
+}
+
+/**
+ * myrb_hba_enquiry - updates the controller status
+ *
+ * Executes a DAC_V1_Enquiry command and updates the controller status.
+ *
+ * Return: command status
+ */
+static unsigned short myrb_hba_enquiry(struct myrb_hba *cb)
+{
+	struct myrb_enquiry old, *new;
+	unsigned short status;
+
+	memcpy(&old, cb->enquiry, sizeof(struct myrb_enquiry));
+
+	status = myrb_exec_type3(cb, MYRB_CMD_ENQUIRY, cb->enquiry_addr);
+	if (status != MYRB_STATUS_SUCCESS)
+		return status;
+
+	new = cb->enquiry;
+	if (new->ldev_count > old.ldev_count) {
+		int ldev_num = old.ldev_count - 1;
+
+		while (++ldev_num < new->ldev_count)
+			shost_printk(KERN_CRIT, cb->host,
+				     "Logical Drive %d Now Exists\n",
+				     ldev_num);
+	}
+	if (new->ldev_count < old.ldev_count) {
+		int ldev_num = new->ldev_count - 1;
+
+		while (++ldev_num < old.ldev_count)
+			shost_printk(KERN_CRIT, cb->host,
+				     "Logical Drive %d No Longer Exists\n",
+				     ldev_num);
+	}
+	if (new->status.deferred != old.status.deferred)
+		shost_printk(KERN_CRIT, cb->host,
+			     "Deferred Write Error Flag is now %s\n",
+			     (new->status.deferred ? "TRUE" : "FALSE"));
+	if (new->ev_seq != old.ev_seq) {
+		cb->new_ev_seq = new->ev_seq;
+		cb->need_err_info = true;
+		shost_printk(KERN_INFO, cb->host,
+			     "Event log %d/%d (%d/%d) available\n",
+			     cb->old_ev_seq, cb->new_ev_seq,
+			     old.ev_seq, new->ev_seq);
+	}
+	if ((new->ldev_critical > 0 &&
+	     new->ldev_critical != old.ldev_critical) ||
+	    (new->ldev_offline > 0 &&
+	     new->ldev_offline != old.ldev_offline) ||
+	    (new->ldev_count != old.ldev_count)) {
+		shost_printk(KERN_INFO, cb->host,
+			     "Logical drive count changed (%d/%d/%d)\n",
+			     new->ldev_critical,
+			     new->ldev_offline,
+			     new->ldev_count);
+		cb->need_ldev_info = true;
+	}
+	if (new->pdev_dead > 0 ||
+	    new->pdev_dead != old.pdev_dead ||
+	    time_after_eq(jiffies, cb->secondary_monitor_time
+			  + MYRB_SECONDARY_MONITOR_INTERVAL)) {
+		cb->need_bgi_status = cb->bgi_status_supported;
+		cb->secondary_monitor_time = jiffies;
+	}
+	if (new->rbld == MYRB_STDBY_RBLD_IN_PROGRESS ||
+	    new->rbld == MYRB_BG_RBLD_IN_PROGRESS ||
+	    old.rbld == MYRB_STDBY_RBLD_IN_PROGRESS ||
+	    old.rbld == MYRB_BG_RBLD_IN_PROGRESS) {
+		cb->need_rbld = true;
+		cb->rbld_first = (new->ldev_critical < old.ldev_critical);
+	}
+	if (old.rbld == MYRB_BG_CHECK_IN_PROGRESS)
+		switch (new->rbld) {
+		case MYRB_NO_STDBY_RBLD_OR_CHECK_IN_PROGRESS:
+			shost_printk(KERN_INFO, cb->host,
+				     "Consistency Check Completed Successfully\n");
+			break;
+		case MYRB_STDBY_RBLD_IN_PROGRESS:
+		case MYRB_BG_RBLD_IN_PROGRESS:
+			break;
+		case MYRB_BG_CHECK_IN_PROGRESS:
+			cb->need_cc_status = true;
+			break;
+		case MYRB_STDBY_RBLD_COMPLETED_WITH_ERROR:
+			shost_printk(KERN_INFO, cb->host,
+				     "Consistency Check Completed with Error\n");
+			break;
+		case MYRB_BG_RBLD_OR_CHECK_FAILED_DRIVE_FAILED:
+			shost_printk(KERN_INFO, cb->host,
+				     "Consistency Check Failed - Physical Device Failed\n");
+			break;
+		case MYRB_BG_RBLD_OR_CHECK_FAILED_LDEV_FAILED:
+			shost_printk(KERN_INFO, cb->host,
+				     "Consistency Check Failed - Logical Drive Failed\n");
+			break;
+		case MYRB_BG_RBLD_OR_CHECK_FAILED_OTHER:
+			shost_printk(KERN_INFO, cb->host,
+				     "Consistency Check Failed - Other Causes\n");
+			break;
+		case MYRB_BG_RBLD_OR_CHECK_SUCCESS_TERMINATED:
+			shost_printk(KERN_INFO, cb->host,
+				     "Consistency Check Successfully Terminated\n");
+			break;
+		}
+	else if (new->rbld == MYRB_BG_CHECK_IN_PROGRESS)
+		cb->need_cc_status = true;
+
+	return MYRB_STATUS_SUCCESS;
+}
+
+/**
+ * myrb_set_pdev_state - sets the device state for a physical device
+ *
+ * Return: command status
+ */
+static unsigned short myrb_set_pdev_state(struct myrb_hba *cb,
+		struct scsi_device *sdev, enum myrb_devstate state)
+{
+	struct myrb_cmdblk *cmd_blk = &cb->dcmd_blk;
+	union myrb_cmd_mbox *mbox = &cmd_blk->mbox;
+	unsigned short status;
+
+	mutex_lock(&cb->dcmd_mutex);
+	mbox->type3D.opcode = MYRB_CMD_START_DEVICE;
+	mbox->type3D.id = MYRB_DCMD_TAG;
+	mbox->type3D.channel = sdev->channel;
+	mbox->type3D.target = sdev->id;
+	mbox->type3D.state = state & 0x1F;
+	status = myrb_exec_cmd(cb, cmd_blk);
+	mutex_unlock(&cb->dcmd_mutex);
+
+	return status;
+}
+
+/**
+ * myrb_enable_mmio - enables the Memory Mailbox Interface
+ *
+ * PD and P controller types have no memory mailbox, but still need the
+ * other dma mapped memory.
+ *
+ * Return: true on success, false otherwise.
+ */
+static bool myrb_enable_mmio(struct myrb_hba *cb, mbox_mmio_init_t mmio_init_fn)
+{
+	void __iomem *base = cb->io_base;
+	struct pci_dev *pdev = cb->pdev;
+	size_t err_table_size;
+	size_t ldev_info_size;
+	union myrb_cmd_mbox *cmd_mbox_mem;
+	struct myrb_stat_mbox *stat_mbox_mem;
+	union myrb_cmd_mbox mbox;
+	unsigned short status;
+
+	memset(&mbox, 0, sizeof(union myrb_cmd_mbox));
+
+	if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
+		dev_err(&pdev->dev, "DMA mask out of range\n");
+		return false;
+	}
+
+	cb->enquiry = dma_alloc_coherent(&pdev->dev,
+					 sizeof(struct myrb_enquiry),
+					 &cb->enquiry_addr, GFP_KERNEL);
+	if (!cb->enquiry)
+		return false;
+
+	err_table_size = sizeof(struct myrb_error_entry) *
+		MYRB_MAX_CHANNELS * MYRB_MAX_TARGETS;
+	cb->err_table = dma_alloc_coherent(&pdev->dev, err_table_size,
+					   &cb->err_table_addr, GFP_KERNEL);
+	if (!cb->err_table)
+		return false;
+
+	ldev_info_size = sizeof(struct myrb_ldev_info) * MYRB_MAX_LDEVS;
+	cb->ldev_info_buf = dma_alloc_coherent(&pdev->dev, ldev_info_size,
+					       &cb->ldev_info_addr, GFP_KERNEL);
+	if (!cb->ldev_info_buf)
+		return false;
+
+	/*
+	 * Skip mailbox initialisation for PD and P Controllers
+	 */
+	if (!mmio_init_fn)
+		return true;
+
+	/* These are the base addresses for the command memory mailbox array */
+	cb->cmd_mbox_size =  MYRB_CMD_MBOX_COUNT * sizeof(union myrb_cmd_mbox);
+	cb->first_cmd_mbox = dma_alloc_coherent(&pdev->dev,
+						cb->cmd_mbox_size,
+						&cb->cmd_mbox_addr,
+						GFP_KERNEL);
+	if (!cb->first_cmd_mbox)
+		return false;
+
+	cmd_mbox_mem = cb->first_cmd_mbox;
+	cmd_mbox_mem += MYRB_CMD_MBOX_COUNT - 1;
+	cb->last_cmd_mbox = cmd_mbox_mem;
+	cb->next_cmd_mbox = cb->first_cmd_mbox;
+	cb->prev_cmd_mbox1 = cb->last_cmd_mbox;
+	cb->prev_cmd_mbox2 = cb->last_cmd_mbox - 1;
+
+	/* These are the base addresses for the status memory mailbox array */
+	cb->stat_mbox_size = MYRB_STAT_MBOX_COUNT *
+	    sizeof(struct myrb_stat_mbox);
+	cb->first_stat_mbox = dma_alloc_coherent(&pdev->dev,
+						 cb->stat_mbox_size,
+						 &cb->stat_mbox_addr,
+						 GFP_KERNEL);
+	if (!cb->first_stat_mbox)
+		return false;
+
+	stat_mbox_mem = cb->first_stat_mbox;
+	stat_mbox_mem += MYRB_STAT_MBOX_COUNT - 1;
+	cb->last_stat_mbox = stat_mbox_mem;
+	cb->next_stat_mbox = cb->first_stat_mbox;
+
+	/* Enable the Memory Mailbox Interface. */
+	cb->dual_mode_interface = true;
+	mbox.typeX.opcode = 0x2B;
+	mbox.typeX.id = 0;
+	mbox.typeX.opcode2 = 0x14;
+	mbox.typeX.cmd_mbox_addr = cb->cmd_mbox_addr;
+	mbox.typeX.stat_mbox_addr = cb->stat_mbox_addr;
+
+	status = mmio_init_fn(pdev, base, &mbox);
+	if (status != MYRB_STATUS_SUCCESS) {
+		cb->dual_mode_interface = false;
+		mbox.typeX.opcode2 = 0x10;
+		status = mmio_init_fn(pdev, base, &mbox);
+		if (status != MYRB_STATUS_SUCCESS) {
+			dev_err(&pdev->dev,
+				"Failed to enable mailbox, statux %02X\n",
+				status);
+			return false;
+		}
+	}
+	return true;
+}
+
+/**
+ * myrb_get_hba_config - reads the configuration information
+ *
+ * Reads the configuration information from the controller and
+ * initializes the controller structure.
+ *
+ * Return: 0 on success, errno otherwise
+ */
+static int myrb_get_hba_config(struct myrb_hba *cb)
+{
+	struct myrb_enquiry2 *enquiry2;
+	dma_addr_t enquiry2_addr;
+	struct myrb_config2 *config2;
+	dma_addr_t config2_addr;
+	struct Scsi_Host *shost = cb->host;
+	struct pci_dev *pdev = cb->pdev;
+	int pchan_max = 0, pchan_cur = 0;
+	unsigned short status;
+	int ret = -ENODEV, memsize = 0;
+
+	enquiry2 = dma_alloc_coherent(&pdev->dev, sizeof(struct myrb_enquiry2),
+				      &enquiry2_addr, GFP_KERNEL);
+	if (!enquiry2) {
+		shost_printk(KERN_ERR, cb->host,
+			     "Failed to allocate V1 enquiry2 memory\n");
+		return -ENOMEM;
+	}
+	config2 = dma_alloc_coherent(&pdev->dev, sizeof(struct myrb_config2),
+				     &config2_addr, GFP_KERNEL);
+	if (!config2) {
+		shost_printk(KERN_ERR, cb->host,
+			     "Failed to allocate V1 config2 memory\n");
+		dma_free_coherent(&pdev->dev, sizeof(struct myrb_enquiry2),
+				  enquiry2, enquiry2_addr);
+		return -ENOMEM;
+	}
+	mutex_lock(&cb->dma_mutex);
+	status = myrb_hba_enquiry(cb);
+	mutex_unlock(&cb->dma_mutex);
+	if (status != MYRB_STATUS_SUCCESS) {
+		shost_printk(KERN_WARNING, cb->host,
+			     "Failed it issue V1 Enquiry\n");
+		goto out_free;
+	}
+
+	status = myrb_exec_type3(cb, MYRB_CMD_ENQUIRY2, enquiry2_addr);
+	if (status != MYRB_STATUS_SUCCESS) {
+		shost_printk(KERN_WARNING, cb->host,
+			     "Failed to issue V1 Enquiry2\n");
+		goto out_free;
+	}
+
+	status = myrb_exec_type3(cb, MYRB_CMD_READ_CONFIG2, config2_addr);
+	if (status != MYRB_STATUS_SUCCESS) {
+		shost_printk(KERN_WARNING, cb->host,
+			     "Failed to issue ReadConfig2\n");
+		goto out_free;
+	}
+
+	status = myrb_get_ldev_info(cb);
+	if (status != MYRB_STATUS_SUCCESS) {
+		shost_printk(KERN_WARNING, cb->host,
+			     "Failed to get logical drive information\n");
+		goto out_free;
+	}
+
+	/*
+	 * Initialize the Controller Model Name and Full Model Name fields.
+	 */
+	switch (enquiry2->hw.sub_model) {
+	case DAC960_V1_P_PD_PU:
+		if (enquiry2->scsi_cap.bus_speed == MYRB_SCSI_SPEED_ULTRA)
+			strcpy(cb->model_name, "DAC960PU");
+		else
+			strcpy(cb->model_name, "DAC960PD");
+		break;
+	case DAC960_V1_PL:
+		strcpy(cb->model_name, "DAC960PL");
+		break;
+	case DAC960_V1_PG: