Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2478 insertions, 0 deletions

diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
new file mode 100644
index 000000000000..48f9ece1cbd0
--- /dev/null
+++ b/drivers/scsi/3w-xxxx.c
@@ -0,0 +1,2478 @@
+/* 
+   3w-xxxx.c -- 3ware Storage Controller device driver for Linux.
+
+   Written By: Adam Radford <linuxraid@amcc.com>
+   Modifications By: Joel Jacobson <linux@3ware.com>
+   		     Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+                     Brad Strand <linux@3ware.com>
+
+   Copyright (C) 1999-2005 3ware Inc.
+
+   Kernel compatiblity By: 	Andre Hedrick <andre@suse.com>
+   Non-Copyright (C) 2000	Andre Hedrick <andre@suse.com>
+   
+   Further tiny build fixes and trivial hoovering    Alan Cox
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,           
+   but WITHOUT ANY WARRANTY; without even the implied warranty of            
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             
+   GNU General Public License for more details.                              
+
+   NO WARRANTY                                                               
+   THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR        
+   CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT      
+   LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,      
+   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is    
+   solely responsible for determining the appropriateness of using and       
+   distributing the Program and assumes all risks associated with its        
+   exercise of rights under this Agreement, including but not limited to     
+   the risks and costs of program errors, damage to or loss of data,         
+   programs or equipment, and unavailability or interruption of operations.  
+
+   DISCLAIMER OF LIABILITY                                                   
+   NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY   
+   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL        
+   DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND   
+   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR     
+   TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE    
+   USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED  
+   HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES             
+
+   You should have received a copy of the GNU General Public License         
+   along with this program; if not, write to the Free Software               
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+
+   Bugs/Comments/Suggestions should be mailed to:                            
+   linuxraid@amcc.com
+
+   For more information, goto:
+   http://www.amcc.com
+
+   History
+   -------
+   0.1.000 -     Initial release.
+   0.4.000 -     Added support for Asynchronous Event Notification through
+                 ioctls for 3DM.
+   1.0.000 -     Added DPO & FUA bit support for WRITE_10 & WRITE_6 cdb
+                 to disable drive write-cache before writes.
+   1.1.000 -     Fixed performance bug with DPO & FUA not existing for WRITE_6.
+   1.2.000 -     Added support for clean shutdown notification/feature table.
+   1.02.00.001 - Added support for full command packet posts through ioctls
+                 for 3DM.
+                 Bug fix so hot spare drives don't show up.
+   1.02.00.002 - Fix bug with tw_setfeature() call that caused oops on some
+                 systems.
+   08/21/00    - release previously allocated resources on failure at
+                 tw_allocate_memory (acme)
+   1.02.00.003 - Fix tw_interrupt() to report error to scsi layer when
+                 controller status is non-zero.
+                 Added handling of request_sense opcode.
+                 Fix possible null pointer dereference in 
+                 tw_reset_device_extension()
+   1.02.00.004 - Add support for device id of 3ware 7000 series controllers.
+                 Make tw_setfeature() call with interrupts disabled.
+                 Register interrupt handler before enabling interrupts.
+                 Clear attention interrupt before draining aen queue.
+   1.02.00.005 - Allocate bounce buffers and custom queue depth for raid5 for
+                 6000 and 5000 series controllers.
+                 Reduce polling mdelays causing problems on some systems.
+                 Fix use_sg = 1 calculation bug.
+                 Check for scsi_register returning NULL.
+                 Add aen count to /proc/scsi/3w-xxxx.
+                 Remove aen code unit masking in tw_aen_complete().
+   1.02.00.006 - Remove unit from printk in tw_scsi_eh_abort(), causing
+                 possible oops.
+                 Fix possible null pointer dereference in tw_scsi_queue()
+                 if done function pointer was invalid.
+   1.02.00.007 - Fix possible null pointer dereferences in tw_ioctl().
+                 Remove check for invalid done function pointer from
+                 tw_scsi_queue().
+   1.02.00.008 - Set max sectors per io to TW_MAX_SECTORS in tw_findcards().
+                 Add tw_decode_error() for printing readable error messages.
+                 Print some useful information on certain aen codes.
+                 Add tw_decode_bits() for interpreting status register output.
+                 Make scsi_set_pci_device() for kernels >= 2.4.4
+                 Fix bug where aen's could be lost before a reset.
+                 Re-add spinlocks in tw_scsi_detect().
+                 Fix possible null pointer dereference in tw_aen_drain_queue()
+                 during initialization.
+                 Clear pci parity errors during initialization and during io.
+   1.02.00.009 - Remove redundant increment in tw_state_request_start().
+                 Add ioctl support for direct ATA command passthru.
+                 Add entire aen code string list.
+   1.02.00.010 - Cleanup queueing code, fix jbod thoughput.
+                 Fix get_param for specific units.
+   1.02.00.011 - Fix bug in tw_aen_complete() where aen's could be lost.
+                 Fix tw_aen_drain_queue() to display useful info at init.
+                 Set tw_host->max_id for 12 port cards.
+                 Add ioctl support for raw command packet post from userspace
+                 with sglist fragments (parameter and io).
+   1.02.00.012 - Fix read capacity to under report by 1 sector to fix get
+                 last sector ioctl.
+   1.02.00.013 - Fix bug where more AEN codes weren't coming out during
+                 driver initialization.
+                 Improved handling of PCI aborts.
+   1.02.00.014 - Fix bug in tw_findcards() where AEN code could be lost.
+                 Increase timeout in tw_aen_drain_queue() to 30 seconds.
+   1.02.00.015 - Re-write raw command post with data ioctl method.
+                 Remove raid5 bounce buffers for raid5 for 6XXX for kernel 2.5
+                 Add tw_map/unmap_scsi_sg/single_data() for kernel 2.5
+                 Replace io_request_lock with host_lock for kernel 2.5
+                 Set max_cmd_len to 16 for 3dm for kernel 2.5
+   1.02.00.016 - Set host->max_sectors back up to 256.
+   1.02.00.017 - Modified pci parity error handling/clearing from config space
+                 during initialization.
+   1.02.00.018 - Better handling of request sense opcode and sense information
+                 for failed commands.  Add tw_decode_sense().
+                 Replace all mdelay()'s with scsi_sleep().
+   1.02.00.019 - Revert mdelay's and scsi_sleep's, this caused problems on
+                 some SMP systems.
+   1.02.00.020 - Add pci_set_dma_mask(), rewrite kmalloc()/virt_to_bus() to
+                 pci_alloc/free_consistent().
+                 Better alignment checking in tw_allocate_memory().
+                 Cleanup tw_initialize_device_extension().
+   1.02.00.021 - Bump cmd_per_lun in SHT to 255 for better jbod performance.
+                 Improve handling of errors in tw_interrupt().
+                 Add handling/clearing of controller queue error.
+                 Empty stale responses before draining aen queue.
+                 Fix tw_scsi_eh_abort() to not reset on every io abort.
+                 Set can_queue in SHT to 255 to prevent hang from AEN.
+   1.02.00.022 - Fix possible null pointer dereference in tw_scsi_release().
+   1.02.00.023 - Fix bug in tw_aen_drain_queue() where unit # was always zero.
+   1.02.00.024 - Add severity levels to AEN strings.
+   1.02.00.025 - Fix command interrupt spurious error messages.
+                 Fix bug in raw command post with data ioctl method.
+                 Fix bug where rollcall sometimes failed with cable errors.
+                 Print unit # on all command timeouts.
+   1.02.00.026 - Fix possible infinite retry bug with power glitch induced
+                 drive timeouts.
+                 Cleanup some AEN severity levels.
+   1.02.00.027 - Add drive not supported AEN code for SATA controllers.
+                 Remove spurious unknown ioctl error message.
+   1.02.00.028 - Fix bug where multiple controllers with no units were the
+                 same card number.
+                 Fix bug where cards were being shut down more than once.
+   1.02.00.029 - Add missing pci_free_consistent() in tw_allocate_memory().
+                 Replace pci_map_single() with pci_map_page() for highmem.
+                 Check for tw_setfeature() failure.
+   1.02.00.030 - Make driver 64-bit clean.
+   1.02.00.031 - Cleanup polling timeouts/routines in several places.
+                 Add support for mode sense opcode.
+                 Add support for cache mode page.
+                 Add support for synchronize cache opcode.
+   1.02.00.032 - Fix small multicard rollcall bug.
+                 Make driver stay loaded with no units for hot add/swap.
+                 Add support for "twe" character device for ioctls.
+                 Clean up request_id queueing code.
+                 Fix tw_scsi_queue() spinlocks.
+   1.02.00.033 - Fix tw_aen_complete() to not queue 'queue empty' AEN's.
+                 Initialize queues correctly when loading with no valid units.
+   1.02.00.034 - Fix tw_decode_bits() to handle multiple errors.
+                 Add support for user configurable cmd_per_lun.
+                 Add support for sht->slave_configure().
+   1.02.00.035 - Improve tw_allocate_memory() memory allocation.
+                 Fix tw_chrdev_ioctl() to sleep correctly.
+   1.02.00.036 - Increase character ioctl timeout to 60 seconds.
+   1.02.00.037 - Fix tw_ioctl() to handle all non-data ATA passthru cmds
+                 for 'smartmontools' support.
+   1.26.00.038 - Roll driver minor version to 26 to denote kernel 2.6.
+                 Add support for cmds_per_lun module parameter.
+   1.26.00.039 - Fix bug in tw_chrdev_ioctl() polling code.
+                 Fix data_buffer_length usage in tw_chrdev_ioctl().
+                 Update contact information.
+   1.26.02.000 - Convert driver to pci_driver format.
+   1.26.02.001 - Increase max ioctl buffer size to 512 sectors.
+                 Make tw_scsi_queue() return 0 for 'Unknown scsi opcode'.
+                 Fix tw_remove() to free irq handler/unregister_chrdev()
+                 before shutting down card.
+                 Change to new 'change_queue_depth' api.
+                 Fix 'handled=1' ISR usage, remove bogus IRQ check.
+*/
+
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/time.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_cmnd.h>
+#include "3w-xxxx.h"
+
+/* Globals */
+#define TW_DRIVER_VERSION "1.26.02.001"
+static TW_Device_Extension *tw_device_extension_list[TW_MAX_SLOT];
+static int tw_device_extension_count = 0;
+static int twe_major = -1;
+
+/* Module parameters */
+MODULE_AUTHOR("AMCC");
+MODULE_DESCRIPTION("3ware Storage Controller Linux Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(TW_DRIVER_VERSION);
+
+/* Function prototypes */
+static int tw_reset_device_extension(TW_Device_Extension *tw_dev, int ioctl_reset);
+
+/* Functions */
+
+/* This function will check the status register for unexpected bits */
+static int tw_check_bits(u32 status_reg_value)
+{
+	if ((status_reg_value & TW_STATUS_EXPECTED_BITS) != TW_STATUS_EXPECTED_BITS) {  
+		dprintk(KERN_WARNING "3w-xxxx: tw_check_bits(): No expected bits (0x%x).\n", status_reg_value);
+		return 1;
+	}
+	if ((status_reg_value & TW_STATUS_UNEXPECTED_BITS) != 0) {
+		dprintk(KERN_WARNING "3w-xxxx: tw_check_bits(): Found unexpected bits (0x%x).\n", status_reg_value);
+		return 1;
+	}
+
+	return 0;
+} /* End tw_check_bits() */
+
+/* This function will print readable messages from status register errors */
+static int tw_decode_bits(TW_Device_Extension *tw_dev, u32 status_reg_value, int print_host)
+{
+	char host[16];
+
+	dprintk(KERN_WARNING "3w-xxxx: tw_decode_bits()\n");
+
+	if (print_host)
+		sprintf(host, " scsi%d:", tw_dev->host->host_no);
+	else
+		host[0] = '\0';
+
+	if (status_reg_value & TW_STATUS_PCI_PARITY_ERROR) {
+		printk(KERN_WARNING "3w-xxxx:%s PCI Parity Error: clearing.\n", host);
+		outl(TW_CONTROL_CLEAR_PARITY_ERROR, TW_CONTROL_REG_ADDR(tw_dev));
+	}
+
+	if (status_reg_value & TW_STATUS_PCI_ABORT) {
+		printk(KERN_WARNING "3w-xxxx:%s PCI Abort: clearing.\n", host);
+		outl(TW_CONTROL_CLEAR_PCI_ABORT, TW_CONTROL_REG_ADDR(tw_dev));
+		pci_write_config_word(tw_dev->tw_pci_dev, PCI_STATUS, TW_PCI_CLEAR_PCI_ABORT);
+	}
+
+	if (status_reg_value & TW_STATUS_QUEUE_ERROR) {
+		printk(KERN_WARNING "3w-xxxx:%s Controller Queue Error: clearing.\n", host);
+		outl(TW_CONTROL_CLEAR_QUEUE_ERROR, TW_CONTROL_REG_ADDR(tw_dev));
+	}
+
+	if (status_reg_value & TW_STATUS_SBUF_WRITE_ERROR) {
+		printk(KERN_WARNING "3w-xxxx:%s SBUF Write Error: clearing.\n", host);
+		outl(TW_CONTROL_CLEAR_SBUF_WRITE_ERROR, TW_CONTROL_REG_ADDR(tw_dev));
+	}
+
+	if (status_reg_value & TW_STATUS_MICROCONTROLLER_ERROR) {
+		if (tw_dev->reset_print == 0) {
+			printk(KERN_WARNING "3w-xxxx:%s Microcontroller Error: clearing.\n", host);
+			tw_dev->reset_print = 1;
+		}
+		return 1;
+	}
+	
+	return 0;
+} /* End tw_decode_bits() */
+
+/* This function will poll the status register for a flag */
+static int tw_poll_status(TW_Device_Extension *tw_dev, u32 flag, int seconds)
+{
+	u32 status_reg_value;
+	unsigned long before;
+	int retval = 1;
+
+	status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+	before = jiffies;
+
+	if (tw_check_bits(status_reg_value))
+		tw_decode_bits(tw_dev, status_reg_value, 0);
+
+	while ((status_reg_value & flag) != flag) {
+		status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+
+		if (tw_check_bits(status_reg_value))
+			tw_decode_bits(tw_dev, status_reg_value, 0);
+
+		if (time_after(jiffies, before + HZ * seconds))
+			goto out;
+
+		msleep(50);
+	}
+	retval = 0;
+out:
+	return retval;
+} /* End tw_poll_status() */
+
+/* This function will poll the status register for disappearance of a flag */
+static int tw_poll_status_gone(TW_Device_Extension *tw_dev, u32 flag, int seconds)
+{
+	u32 status_reg_value;
+	unsigned long before;
+	int retval = 1;
+
+	status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+	before = jiffies;
+
+	if (tw_check_bits(status_reg_value))
+		tw_decode_bits(tw_dev, status_reg_value, 0);
+
+	while ((status_reg_value & flag) != 0) {
+		status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+
+		if (tw_check_bits(status_reg_value))
+			tw_decode_bits(tw_dev, status_reg_value, 0);
+
+		if (time_after(jiffies, before + HZ * seconds))
+			goto out;
+
+		msleep(50);
+	}
+	retval = 0;
+out:
+	return retval;
+} /* End tw_poll_status_gone() */
+
+/* This function will attempt to post a command packet to the board */
+static int tw_post_command_packet(TW_Device_Extension *tw_dev, int request_id)
+{
+	u32 status_reg_value;
+	unsigned long command_que_value;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_post_command_packet()\n");
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+
+	if (tw_check_bits(status_reg_value)) {
+		dprintk(KERN_WARNING "3w-xxxx: tw_post_command_packet(): Unexpected bits.\n");
+		tw_decode_bits(tw_dev, status_reg_value, 1);
+	}
+
+	if ((status_reg_value & TW_STATUS_COMMAND_QUEUE_FULL) == 0) {
+		/* We successfully posted the command packet */
+		outl(command_que_value, TW_COMMAND_QUEUE_REG_ADDR(tw_dev));
+		tw_dev->state[request_id] = TW_S_POSTED;
+		tw_dev->posted_request_count++;
+		if (tw_dev->posted_request_count > tw_dev->max_posted_request_count) {
+			tw_dev->max_posted_request_count = tw_dev->posted_request_count;
+		}
+	} else {
+		/* Couldn't post the command packet, so we do it in the isr */
+		if (tw_dev->state[request_id] != TW_S_PENDING) {
+			tw_dev->state[request_id] = TW_S_PENDING;
+			tw_dev->pending_request_count++;
+			if (tw_dev->pending_request_count > tw_dev->max_pending_request_count) {
+				tw_dev->max_pending_request_count = tw_dev->pending_request_count;
+			}
+			tw_dev->pending_queue[tw_dev->pending_tail] = request_id;
+			if (tw_dev->pending_tail == TW_Q_LENGTH-1) {
+				tw_dev->pending_tail = TW_Q_START;
+			} else {
+				tw_dev->pending_tail = tw_dev->pending_tail + 1;
+			}
+		} 
+		TW_UNMASK_COMMAND_INTERRUPT(tw_dev);
+		return 1;
+	}
+	return 0;
+} /* End tw_post_command_packet() */
+
+/* This function will return valid sense buffer information for failed cmds */
+static int tw_decode_sense(TW_Device_Extension *tw_dev, int request_id, int fill_sense)
+{
+	int i;
+	TW_Command *command;
+
+        dprintk(KERN_WARNING "3w-xxxx: tw_decode_sense()\n");
+	command = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+
+	printk(KERN_WARNING "3w-xxxx: scsi%d: Command failed: status = 0x%x, flags = 0x%x, unit #%d.\n", tw_dev->host->host_no, command->status, command->flags, TW_UNIT_OUT(command->unit__hostid));
+
+	/* Attempt to return intelligent sense information */
+	if (fill_sense) {
+		if ((command->status == 0xc7) || (command->status == 0xcb)) {
+			for (i=0;i<(sizeof(tw_sense_table)/sizeof(tw_sense_table[0]));i++) {
+				if (command->flags == tw_sense_table[i][0]) {
+
+					/* Valid bit and 'current errors' */
+					tw_dev->srb[request_id]->sense_buffer[0] = (0x1 << 7 | 0x70);
+
+					/* Sense key */
+					tw_dev->srb[request_id]->sense_buffer[2] = tw_sense_table[i][1];
+
+					/* Additional sense length */
+					tw_dev->srb[request_id]->sense_buffer[7] = 0xa; /* 10 bytes */
+
+					/* Additional sense code */
+					tw_dev->srb[request_id]->sense_buffer[12] = tw_sense_table[i][2];
+
+					/* Additional sense code qualifier */
+					tw_dev->srb[request_id]->sense_buffer[13] = tw_sense_table[i][3];
+
+					tw_dev->srb[request_id]->result = (DID_OK << 16) | (CHECK_CONDITION << 1);
+					return TW_ISR_DONT_RESULT; /* Special case for isr to not over-write result */
+				}
+			}
+		}
+
+		/* If no table match, error so we get a reset */
+		return 1;
+	}
+
+	return 0;
+} /* End tw_decode_sense() */
+
+/* This function will report controller error status */
+static int tw_check_errors(TW_Device_Extension *tw_dev) 
+{
+	u32 status_reg_value;
+  
+	status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+
+	if (TW_STATUS_ERRORS(status_reg_value) || tw_check_bits(status_reg_value)) {
+		tw_decode_bits(tw_dev, status_reg_value, 0);
+		return 1;
+	}
+
+	return 0;
+} /* End tw_check_errors() */
+
+/* This function will empty the response que */
+static void tw_empty_response_que(TW_Device_Extension *tw_dev) 
+{
+	u32 status_reg_value, response_que_value;
+
+	status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+
+	while ((status_reg_value & TW_STATUS_RESPONSE_QUEUE_EMPTY) == 0) {
+		response_que_value = inl(TW_RESPONSE_QUEUE_REG_ADDR(tw_dev));
+		status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+	}
+} /* End tw_empty_response_que() */
+
+/* This function will free a request_id */
+static void tw_state_request_finish(TW_Device_Extension *tw_dev, int request_id)
+{
+	tw_dev->free_queue[tw_dev->free_tail] = request_id;
+	tw_dev->state[request_id] = TW_S_FINISHED;
+	tw_dev->free_tail = (tw_dev->free_tail + 1) % TW_Q_LENGTH;
+} /* End tw_state_request_finish() */
+
+/* This function will assign an available request_id */
+static void tw_state_request_start(TW_Device_Extension *tw_dev, int *request_id)
+{
+	*request_id = tw_dev->free_queue[tw_dev->free_head];
+	tw_dev->free_head = (tw_dev->free_head + 1) % TW_Q_LENGTH;
+	tw_dev->state[*request_id] = TW_S_STARTED;
+} /* End tw_state_request_start() */
+
+/* Show some statistics about the card */
+static ssize_t tw_show_stats(struct class_device *class_dev, char *buf)
+{
+	struct Scsi_Host *host = class_to_shost(class_dev);
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
+	unsigned long flags = 0;
+	ssize_t len;
+
+	spin_lock_irqsave(tw_dev->host->host_lock, flags);
+	len = snprintf(buf, PAGE_SIZE, "3w-xxxx Driver version: %s\n"
+		       "Current commands posted:   %4d\n"
+		       "Max commands posted:       %4d\n"
+		       "Current pending commands:  %4d\n"
+		       "Max pending commands:      %4d\n"
+		       "Last sgl length:           %4d\n"
+		       "Max sgl length:            %4d\n"
+		       "Last sector count:         %4d\n"
+		       "Max sector count:          %4d\n"
+		       "SCSI Host Resets:          %4d\n"
+		       "AEN's:                     %4d\n", 
+		       TW_DRIVER_VERSION,
+		       tw_dev->posted_request_count,
+		       tw_dev->max_posted_request_count,
+		       tw_dev->pending_request_count,
+		       tw_dev->max_pending_request_count,
+		       tw_dev->sgl_entries,
+		       tw_dev->max_sgl_entries,
+		       tw_dev->sector_count,
+		       tw_dev->max_sector_count,
+		       tw_dev->num_resets,
+		       tw_dev->aen_count);
+	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+	return len;
+} /* End tw_show_stats() */
+
+/* This function will set a devices queue depth */
+static int tw_change_queue_depth(struct scsi_device *sdev, int queue_depth)
+{
+	if (queue_depth > TW_Q_LENGTH-2)
+		queue_depth = TW_Q_LENGTH-2;
+	scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, queue_depth);
+	return queue_depth;
+} /* End tw_change_queue_depth() */
+
+/* Create sysfs 'stats' entry */
+static struct class_device_attribute tw_host_stats_attr = {
+	.attr = {
+		.name = 	"stats",
+		.mode =		S_IRUGO,
+	},
+	.show = tw_show_stats
+};
+
+/* Host attributes initializer */
+static struct class_device_attribute *tw_host_attrs[] = {
+	&tw_host_stats_attr,
+	NULL,
+};
+
+/* This function will read the aen queue from the isr */
+static int tw_aen_read_queue(TW_Device_Extension *tw_dev, int request_id) 
+{
+	TW_Command *command_packet;
+	TW_Param *param;
+	unsigned long command_que_value;
+	u32 status_reg_value;
+	unsigned long param_value = 0;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_aen_read_queue()\n");
+
+	status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+	if (tw_check_bits(status_reg_value)) {
+		dprintk(KERN_WARNING "3w-xxxx: tw_aen_read_queue(): Unexpected bits.\n");
+		tw_decode_bits(tw_dev, status_reg_value, 1);
+		return 1;
+	}
+	if (tw_dev->command_packet_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_read_queue(): Bad command packet virtual address.\n");
+		return 1;
+	}
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+	memset(command_packet, 0, sizeof(TW_Sector));
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_GET_PARAM);
+	command_packet->size = 4;
+	command_packet->request_id = request_id;
+	command_packet->status = 0;
+	command_packet->flags = 0;
+	command_packet->byte6.parameter_count = 1;
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	if (command_que_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_read_queue(): Bad command packet physical address.\n");
+		return 1;
+	}
+	/* Now setup the param */
+	if (tw_dev->alignment_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_read_queue(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	memset(param, 0, sizeof(TW_Sector));
+	param->table_id = 0x401; /* AEN table */
+	param->parameter_id = 2; /* Unit code */
+	param->parameter_size_bytes = 2;
+	param_value = tw_dev->alignment_physical_address[request_id];
+	if (param_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_read_queue(): Bad alignment physical address.\n");
+		return 1;
+	}
+	command_packet->byte8.param.sgl[0].address = param_value;
+	command_packet->byte8.param.sgl[0].length = sizeof(TW_Sector);
+
+	/* Now post the command packet */
+	if ((status_reg_value & TW_STATUS_COMMAND_QUEUE_FULL) == 0) {
+		dprintk(KERN_WARNING "3w-xxxx: tw_aen_read_queue(): Post succeeded.\n");
+		tw_dev->srb[request_id] = NULL; /* Flag internal command */
+		tw_dev->state[request_id] = TW_S_POSTED;
+		outl(command_que_value, TW_COMMAND_QUEUE_REG_ADDR(tw_dev));
+	} else {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_read_queue(): Post failed, will retry.\n");
+		return 1;
+	}
+
+	return 0;
+} /* End tw_aen_read_queue() */
+
+/* This function will complete an aen request from the isr */
+static int tw_aen_complete(TW_Device_Extension *tw_dev, int request_id) 
+{
+	TW_Param *param;
+	unsigned short aen;
+	int error = 0, table_max = 0;
+
+	dprintk(KERN_WARNING "3w-xxxx: tw_aen_complete()\n");
+	if (tw_dev->alignment_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_complete(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	aen = *(unsigned short *)(param->data);
+	dprintk(KERN_NOTICE "3w-xxxx: tw_aen_complete(): Queue'd code 0x%x\n", aen);
+
+	/* Print some useful info when certain aen codes come out */
+	if (aen == 0x0ff) {
+		printk(KERN_WARNING "3w-xxxx: scsi%d: AEN: INFO: AEN queue overflow.\n", tw_dev->host->host_no);
+	} else {
+		table_max = sizeof(tw_aen_string)/sizeof(char *);
+		if ((aen & 0x0ff) < table_max) {
+			if ((tw_aen_string[aen & 0xff][strlen(tw_aen_string[aen & 0xff])-1]) == '#') {
+				printk(KERN_WARNING "3w-xxxx: scsi%d: AEN: %s%d.\n", tw_dev->host->host_no, tw_aen_string[aen & 0xff], aen >> 8);
+			} else {
+				if (aen != 0x0) 
+					printk(KERN_WARNING "3w-xxxx: scsi%d: AEN: %s.\n", tw_dev->host->host_no, tw_aen_string[aen & 0xff]);
+			}
+		} else {
+			printk(KERN_WARNING "3w-xxxx: scsi%d: Received AEN %d.\n", tw_dev->host->host_no, aen);
+		}
+	}
+	if (aen != TW_AEN_QUEUE_EMPTY) {
+		tw_dev->aen_count++;
+
+		/* Now queue the code */
+		tw_dev->aen_queue[tw_dev->aen_tail] = aen;
+		if (tw_dev->aen_tail == TW_Q_LENGTH - 1) {
+			tw_dev->aen_tail = TW_Q_START;
+		} else {
+			tw_dev->aen_tail = tw_dev->aen_tail + 1;
+		}
+		if (tw_dev->aen_head == tw_dev->aen_tail) {
+			if (tw_dev->aen_head == TW_Q_LENGTH - 1) {
+				tw_dev->aen_head = TW_Q_START;
+			} else {
+				tw_dev->aen_head = tw_dev->aen_head + 1;
+			}
+		}
+
+		error = tw_aen_read_queue(tw_dev, request_id);
+		if (error) {
+			printk(KERN_WARNING "3w-xxxx: scsi%d: Error completing AEN.\n", tw_dev->host->host_no);
+			tw_dev->state[request_id] = TW_S_COMPLETED;
+			tw_state_request_finish(tw_dev, request_id);
+		}
+	} else {
+		tw_dev->state[request_id] = TW_S_COMPLETED;
+		tw_state_request_finish(tw_dev, request_id);
+	}
+
+	return 0;
+} /* End tw_aen_complete() */
+
+/* This function will drain the aen queue after a soft reset */
+static int tw_aen_drain_queue(TW_Device_Extension *tw_dev)
+{
+	TW_Command *command_packet;
+	TW_Param *param;
+	int request_id = 0;
+	unsigned long command_que_value;
+	unsigned long param_value;
+	TW_Response_Queue response_queue;
+	unsigned short aen;
+	unsigned short aen_code;
+	int finished = 0;
+	int first_reset = 0;
+	int queue = 0;
+	int found = 0, table_max = 0;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_aen_drain_queue()\n");
+
+	if (tw_poll_status(tw_dev, TW_STATUS_ATTENTION_INTERRUPT | TW_STATUS_MICROCONTROLLER_READY, 30)) {
+		dprintk(KERN_WARNING "3w-xxxx: tw_aen_drain_queue(): No attention interrupt for card %d.\n", tw_device_extension_count);
+		return 1;
+	}
+	TW_CLEAR_ATTENTION_INTERRUPT(tw_dev);
+
+	/* Empty response queue */
+	tw_empty_response_que(tw_dev);
+
+	/* Initialize command packet */
+	if (tw_dev->command_packet_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_drain_queue(): Bad command packet virtual address.\n");
+		return 1;
+	}
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+	memset(command_packet, 0, sizeof(TW_Sector));
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_GET_PARAM);
+	command_packet->size = 4;
+	command_packet->request_id = request_id;
+	command_packet->status = 0;
+	command_packet->flags = 0;
+	command_packet->byte6.parameter_count = 1;
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	if (command_que_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_drain_queue(): Bad command packet physical address.\n");
+		return 1;
+	}
+
+	/* Now setup the param */
+	if (tw_dev->alignment_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_drain_queue(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	memset(param, 0, sizeof(TW_Sector));
+	param->table_id = 0x401; /* AEN table */
+	param->parameter_id = 2; /* Unit code */
+	param->parameter_size_bytes = 2;
+	param_value = tw_dev->alignment_physical_address[request_id];
+	if (param_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_aen_drain_queue(): Bad alignment physical address.\n");
+		return 1;
+	}
+	command_packet->byte8.param.sgl[0].address = param_value;
+	command_packet->byte8.param.sgl[0].length = sizeof(TW_Sector);
+
+	/* Now drain the controller's aen queue */
+	do {
+		/* Post command packet */
+		outl(command_que_value, TW_COMMAND_QUEUE_REG_ADDR(tw_dev));
+
+		/* Now poll for completion */
+		if (tw_poll_status_gone(tw_dev, TW_STATUS_RESPONSE_QUEUE_EMPTY, 30) == 0) {
+			response_queue.value = inl(TW_RESPONSE_QUEUE_REG_ADDR(tw_dev));
+			request_id = TW_RESID_OUT(response_queue.response_id);
+
+			if (request_id != 0) {
+				/* Unexpected request id */
+				printk(KERN_WARNING "3w-xxxx: tw_aen_drain_queue(): Unexpected request id.\n");
+				return 1;
+			}
+			
+			if (command_packet->status != 0) {
+				if (command_packet->flags != TW_AEN_TABLE_UNDEFINED) {
+					/* Bad response */
+					tw_decode_sense(tw_dev, request_id, 0);
+					return 1;
+				} else {
+					/* We know this is a 3w-1x00, and doesn't support aen's */
+					return 0;
+				}
+			}
+
+			/* Now check the aen */
+			aen = *(unsigned short *)(param->data);
+			aen_code = (aen & 0x0ff);
+			queue = 0;
+			switch (aen_code) {
+				case TW_AEN_QUEUE_EMPTY:
+					dprintk(KERN_WARNING "3w-xxxx: AEN: %s.\n", tw_aen_string[aen & 0xff]);
+					if (first_reset != 1) {
+						return 1;
+					} else {
+						finished = 1;
+					}
+					break;
+				case TW_AEN_SOFT_RESET:
+					if (first_reset == 0) {
+						first_reset = 1;
+					} else {
+						printk(KERN_WARNING "3w-xxxx: AEN: %s.\n", tw_aen_string[aen & 0xff]);
+						tw_dev->aen_count++;
+						queue = 1;
+					}
+					break;
+				default:
+					if (aen == 0x0ff) {
+						printk(KERN_WARNING "3w-xxxx: AEN: INFO: AEN queue overflow.\n");
+					} else {
+						table_max = sizeof(tw_aen_string)/sizeof(char *);
+						if ((aen & 0x0ff) < table_max) {
+							if ((tw_aen_string[aen & 0xff][strlen(tw_aen_string[aen & 0xff])-1]) == '#') {
+								printk(KERN_WARNING "3w-xxxx: AEN: %s%d.\n", tw_aen_string[aen & 0xff], aen >> 8);
+							} else {
+								printk(KERN_WARNING "3w-xxxx: AEN: %s.\n", tw_aen_string[aen & 0xff]);
+							}
+						} else
+							printk(KERN_WARNING "3w-xxxx: Received AEN %d.\n", aen);
+					}
+					tw_dev->aen_count++;
+					queue = 1;
+			}
+
+			/* Now put the aen on the aen_queue */
+			if (queue == 1) {
+				tw_dev->aen_queue[tw_dev->aen_tail] = aen;
+				if (tw_dev->aen_tail == TW_Q_LENGTH - 1) {
+					tw_dev->aen_tail = TW_Q_START;
+				} else {
+					tw_dev->aen_tail = tw_dev->aen_tail + 1;
+				}
+				if (tw_dev->aen_head == tw_dev->aen_tail) {
+					if (tw_dev->aen_head == TW_Q_LENGTH - 1) {
+						tw_dev->aen_head = TW_Q_START;
+					} else {
+						tw_dev->aen_head = tw_dev->aen_head + 1;
+					}
+				}
+			}
+			found = 1;
+		}
+		if (found == 0) {
+			printk(KERN_WARNING "3w-xxxx: tw_aen_drain_queue(): Response never received.\n");
+			return 1;
+		}
+	} while (finished == 0);
+
+	return 0;
+} /* End tw_aen_drain_queue() */
+
+/* This function will allocate memory */
+static int tw_allocate_memory(TW_Device_Extension *tw_dev, int size, int which)
+{
+	int i;
+	dma_addr_t dma_handle;
+	unsigned long *cpu_addr = NULL;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_allocate_memory()\n");
+
+	cpu_addr = pci_alloc_consistent(tw_dev->tw_pci_dev, size*TW_Q_LENGTH, &dma_handle);
+	if (cpu_addr == NULL) {
+		printk(KERN_WARNING "3w-xxxx: pci_alloc_consistent() failed.\n");
+		return 1;
+	}
+
+	if ((unsigned long)cpu_addr % (tw_dev->tw_pci_dev->device == TW_DEVICE_ID ? TW_ALIGNMENT_6000 : TW_ALIGNMENT_7000)) {
+		printk(KERN_WARNING "3w-xxxx: Couldn't allocate correctly aligned memory.\n");
+		pci_free_consistent(tw_dev->tw_pci_dev, size*TW_Q_LENGTH, cpu_addr, dma_handle);
+		return 1;
+	}
+
+	memset(cpu_addr, 0, size*TW_Q_LENGTH);
+
+	for (i=0;i<TW_Q_LENGTH;i++) {
+		switch(which) {
+		case 0:
+			tw_dev->command_packet_physical_address[i] = dma_handle+(i*size);
+			tw_dev->command_packet_virtual_address[i] = (unsigned long *)((unsigned char *)cpu_addr + (i*size));
+			break;
+		case 1:
+			tw_dev->alignment_physical_address[i] = dma_handle+(i*size);
+			tw_dev->alignment_virtual_address[i] = (unsigned long *)((unsigned char *)cpu_addr + (i*size));
+			break;
+		default:
+			printk(KERN_WARNING "3w-xxxx: tw_allocate_memory(): case slip in tw_allocate_memory()\n");
+			return 1;
+		}
+	}
+
+	return 0;
+} /* End tw_allocate_memory() */
+
+/* This function handles ioctl for the character device */
+static int tw_chrdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int request_id;
+	dma_addr_t dma_handle;
+	unsigned short tw_aen_code;
+	unsigned long flags;
+	unsigned int data_buffer_length = 0;
+	unsigned long data_buffer_length_adjusted = 0;
+	unsigned long *cpu_addr;
+	long timeout;
+	TW_New_Ioctl *tw_ioctl;
+	TW_Passthru *passthru;
+	TW_Device_Extension *tw_dev = tw_device_extension_list[iminor(inode)];
+	int retval = -EFAULT;
+	void __user *argp = (void __user *)arg;
+
+	dprintk(KERN_WARNING "3w-xxxx: tw_chrdev_ioctl()\n");
+
+	/* Only let one of these through at a time */
+	if (down_interruptible(&tw_dev->ioctl_sem))
+		return -EINTR;
+
+	/* First copy down the buffer length */
+	if (copy_from_user(&data_buffer_length, argp, sizeof(unsigned int)))
+		goto out;
+
+	/* Check size */
+	if (data_buffer_length > TW_MAX_IOCTL_SECTORS * 512) {
+		retval = -EINVAL;
+		goto out;
+	}
+
+	/* Hardware can only do multiple of 512 byte transfers */
+	data_buffer_length_adjusted = (data_buffer_length + 511) & ~511;
+	
+	/* Now allocate ioctl buf memory */
+	cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_New_Ioctl) - 1, &dma_handle, GFP_KERNEL);
+	if (cpu_addr == NULL) {
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	tw_ioctl = (TW_New_Ioctl *)cpu_addr;
+
+	/* Now copy down the entire ioctl */
+	if (copy_from_user(tw_ioctl, argp, data_buffer_length + sizeof(TW_New_Ioctl) - 1))
+		goto out2;
+
+	passthru = (TW_Passthru *)&tw_ioctl->firmware_command;
+
+	/* See which ioctl we are doing */
+	switch (cmd) {
+		case TW_OP_NOP:
+			dprintk(KERN_WARNING "3w-xxxx: tw_chrdev_ioctl(): caught TW_OP_NOP.\n");
+			break;
+		case TW_OP_AEN_LISTEN:
+			dprintk(KERN_WARNING "3w-xxxx: tw_chrdev_ioctl(): caught TW_AEN_LISTEN.\n");
+			memset(tw_ioctl->data_buffer, 0, data_buffer_length);
+
+			spin_lock_irqsave(tw_dev->host->host_lock, flags);
+			if (tw_dev->aen_head == tw_dev->aen_tail) {
+				tw_aen_code = TW_AEN_QUEUE_EMPTY;
+			} else {
+				tw_aen_code = tw_dev->aen_queue[tw_dev->aen_head];
+				if (tw_dev->aen_head == TW_Q_LENGTH - 1) {
+					tw_dev->aen_head = TW_Q_START;
+				} else {
+					tw_dev->aen_head = tw_dev->aen_head + 1;
+				}
+			}
+			spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+			memcpy(tw_ioctl->data_buffer, &tw_aen_code, sizeof(tw_aen_code));
+			break;
+		case TW_CMD_PACKET_WITH_DATA:
+			dprintk(KERN_WARNING "3w-xxxx: tw_chrdev_ioctl(): caught TW_CMD_PACKET_WITH_DATA.\n");
+			spin_lock_irqsave(tw_dev->host->host_lock, flags);
+
+			tw_state_request_start(tw_dev, &request_id);
+
+			/* Flag internal command */
+			tw_dev->srb[request_id] = NULL;
+
+			/* Flag chrdev ioctl */
+			tw_dev->chrdev_request_id = request_id;
+
+			tw_ioctl->firmware_command.request_id = request_id;
+
+			/* Load the sg list */
+			switch (TW_SGL_OUT(tw_ioctl->firmware_command.opcode__sgloffset)) {
+			case 2:
+				tw_ioctl->firmware_command.byte8.param.sgl[0].address = dma_handle + sizeof(TW_New_Ioctl) - 1;
+				tw_ioctl->firmware_command.byte8.param.sgl[0].length = data_buffer_length_adjusted;
+				break;
+			case 3:
+				tw_ioctl->firmware_command.byte8.io.sgl[0].address = dma_handle + sizeof(TW_New_Ioctl) - 1;
+				tw_ioctl->firmware_command.byte8.io.sgl[0].length = data_buffer_length_adjusted;
+				break;
+			case 5:
+				passthru->sg_list[0].address = dma_handle + sizeof(TW_New_Ioctl) - 1;
+				passthru->sg_list[0].length = data_buffer_length_adjusted;
+				break;
+			}
+
+			memcpy(tw_dev->command_packet_virtual_address[request_id], &(tw_ioctl->firmware_command), sizeof(TW_Command));
+
+			/* Now post the command packet to the controller */
+			tw_post_command_packet(tw_dev, request_id);
+			spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+
+			timeout = TW_IOCTL_CHRDEV_TIMEOUT*HZ;
+
+			/* Now wait for the command to complete */
+			timeout = wait_event_timeout(tw_dev->ioctl_wqueue, tw_dev->chrdev_request_id == TW_IOCTL_CHRDEV_FREE, timeout);
+
+			/* See if we reset while waiting for the ioctl to complete */
+			if (test_bit(TW_IN_RESET, &tw_dev->flags)) {
+				clear_bit(TW_IN_RESET, &tw_dev->flags);
+				retval = -ERESTARTSYS;
+				goto out2;
+			}
+
+			/* We timed out, and didn't get an interrupt */
+			if (tw_dev->chrdev_request_id != TW_IOCTL_CHRDEV_FREE) {
+				/* Now we need to reset the board */
+				printk(KERN_WARNING "3w-xxxx: scsi%d: Character ioctl (0x%x) timed out, resetting card.\n", tw_dev->host->host_no, cmd);
+				retval = -EIO;
+				spin_lock_irqsave(tw_dev->host->host_lock, flags);
+				tw_dev->state[request_id] = TW_S_COMPLETED;
+				tw_state_request_finish(tw_dev, request_id);
+				tw_dev->posted_request_count--;
+				spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+				if (tw_reset_device_extension(tw_dev, 1)) {
+					printk(KERN_WARNING "3w-xxxx: tw_chrdev_ioctl(): Reset failed for card %d.\n", tw_dev->host->host_no);
+				}
+				goto out2;
+			}
+
+			/* Now copy in the command packet response */
+			memcpy(&(tw_ioctl->firmware_command), tw_dev->command_packet_virtual_address[request_id], sizeof(TW_Command));
+
+			/* Now complete the io */
+			spin_lock_irqsave(tw_dev->host->host_lock, flags);
+			tw_dev->posted_request_count--;
+			tw_dev->state[request_id] = TW_S_COMPLETED;
+			tw_state_request_finish(tw_dev, request_id);
+			spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+			break;
+		default:
+			retval = -ENOTTY;
+			goto out2;
+	}
+
+	/* Now copy the response to userspace */
+	if (copy_to_user(argp, tw_ioctl, sizeof(TW_New_Ioctl) + data_buffer_length - 1))
+		goto out2;
+	retval = 0;
+out2:
+	/* Now free ioctl buf memory */
+	dma_free_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_New_Ioctl) - 1, cpu_addr, dma_handle);
+out:
+	up(&tw_dev->ioctl_sem);
+	return retval;
+} /* End tw_chrdev_ioctl() */
+
+/* This function handles open for the character device */
+static int tw_chrdev_open(struct inode *inode, struct file *file)
+{
+	unsigned int minor_number;
+
+	dprintk(KERN_WARNING "3w-xxxx: tw_ioctl_open()\n");
+
+	minor_number = iminor(inode);
+	if (minor_number >= tw_device_extension_count)
+		return -ENODEV;
+
+	return 0;
+} /* End tw_chrdev_open() */
+
+/* File operations struct for character device */
+static struct file_operations tw_fops = {
+	.owner		= THIS_MODULE,
+	.ioctl		= tw_chrdev_ioctl,
+	.open		= tw_chrdev_open,
+	.release	= NULL
+};
+
+/* This function will free up device extension resources */
+static void tw_free_device_extension(TW_Device_Extension *tw_dev)
+{
+	dprintk(KERN_NOTICE "3w-xxxx: tw_free_device_extension()\n");
+
+	/* Free command packet and generic buffer memory */
+	if (tw_dev->command_packet_virtual_address[0])
+		pci_free_consistent(tw_dev->tw_pci_dev, sizeof(TW_Command)*TW_Q_LENGTH, tw_dev->command_packet_virtual_address[0], tw_dev->command_packet_physical_address[0]);
+
+	if (tw_dev->alignment_virtual_address[0])
+		pci_free_consistent(tw_dev->tw_pci_dev, sizeof(TW_Sector)*TW_Q_LENGTH, tw_dev->alignment_virtual_address[0], tw_dev->alignment_physical_address[0]);
+} /* End tw_free_device_extension() */
+
+/* This function will send an initconnection command to controller */
+static int tw_initconnection(TW_Device_Extension *tw_dev, int message_credits) 
+{
+	unsigned long command_que_value;
+	TW_Command  *command_packet;
+	TW_Response_Queue response_queue;
+	int request_id = 0;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_initconnection()\n");
+
+	/* Initialize InitConnection command packet */
+	if (tw_dev->command_packet_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_initconnection(): Bad command packet virtual address.\n");
+		return 1;
+	}
+
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+	memset(command_packet, 0, sizeof(TW_Sector));
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(0, TW_OP_INIT_CONNECTION);
+	command_packet->size = TW_INIT_COMMAND_PACKET_SIZE;
+	command_packet->request_id = request_id;
+	command_packet->status = 0x0;
+	command_packet->flags = 0x0;
+	command_packet->byte6.message_credits = message_credits; 
+	command_packet->byte8.init_connection.response_queue_pointer = 0x0;
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+
+	if (command_que_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_initconnection(): Bad command packet physical address.\n");
+		return 1;
+	}
+  
+	/* Send command packet to the board */
+	outl(command_que_value, TW_COMMAND_QUEUE_REG_ADDR(tw_dev));
+    
+	/* Poll for completion */
+	if (tw_poll_status_gone(tw_dev, TW_STATUS_RESPONSE_QUEUE_EMPTY, 30) == 0) {
+		response_queue.value = inl(TW_RESPONSE_QUEUE_REG_ADDR(tw_dev));
+		request_id = TW_RESID_OUT(response_queue.response_id);
+
+		if (request_id != 0) {
+			/* unexpected request id */
+			printk(KERN_WARNING "3w-xxxx: tw_initconnection(): Unexpected request id.\n");
+			return 1;
+		}
+		if (command_packet->status != 0) {
+			/* bad response */
+			tw_decode_sense(tw_dev, request_id, 0);
+			return 1;
+		}
+	}
+	return 0;
+} /* End tw_initconnection() */
+
+/* Set a value in the features table */
+static int tw_setfeature(TW_Device_Extension *tw_dev, int parm, int param_size,
+                  unsigned char *val)
+{
+	TW_Param *param;
+	TW_Command  *command_packet;
+	TW_Response_Queue response_queue;
+	int request_id = 0;
+	unsigned long command_que_value;
+	unsigned long param_value;
+
+  	/* Initialize SetParam command packet */
+	if (tw_dev->command_packet_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_setfeature(): Bad command packet virtual address.\n");
+		return 1;
+	}
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+	memset(command_packet, 0, sizeof(TW_Sector));
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_SET_PARAM);
+	param->table_id = 0x404;  /* Features table */
+	param->parameter_id = parm;
+	param->parameter_size_bytes = param_size;
+	memcpy(param->data, val, param_size);
+
+	param_value = tw_dev->alignment_physical_address[request_id];
+	if (param_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_setfeature(): Bad alignment physical address.\n");
+		tw_dev->state[request_id] = TW_S_COMPLETED;
+		tw_state_request_finish(tw_dev, request_id);
+		tw_dev->srb[request_id]->result = (DID_OK << 16);
+		tw_dev->srb[request_id]->scsi_done(tw_dev->srb[request_id]);
+	}
+	command_packet->byte8.param.sgl[0].address = param_value;
+	command_packet->byte8.param.sgl[0].length = sizeof(TW_Sector);
+
+	command_packet->size = 4;
+	command_packet->request_id = request_id;
+	command_packet->byte6.parameter_count = 1;
+
+  	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	if (command_que_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_setfeature(): Bad command packet physical address.\n");
+	return 1;
+	}
+
+	/* Send command packet to the board */
+	outl(command_que_value, TW_COMMAND_QUEUE_REG_ADDR(tw_dev));
+
+	/* Poll for completion */
+	if (tw_poll_status_gone(tw_dev, TW_STATUS_RESPONSE_QUEUE_EMPTY, 30) == 0) {
+		response_queue.value = inl(TW_RESPONSE_QUEUE_REG_ADDR(tw_dev));
+		request_id = TW_RESID_OUT(response_queue.response_id);
+
+		if (request_id != 0) {
+			/* unexpected request id */
+			printk(KERN_WARNING "3w-xxxx: tw_setfeature(): Unexpected request id.\n");
+			return 1;
+		}
+		if (command_packet->status != 0) {
+			/* bad response */
+			tw_decode_sense(tw_dev, request_id, 0);
+			return 1;
+		}
+	}
+
+	return 0;
+} /* End tw_setfeature() */
+
+/* This function will reset a controller */
+static int tw_reset_sequence(TW_Device_Extension *tw_dev) 
+{
+	int error = 0;
+	int tries = 0;
+	unsigned char c = 1;
+
+	/* Reset the board */
+	while (tries < TW_MAX_RESET_TRIES) {
+		TW_SOFT_RESET(tw_dev);
+
+		error = tw_aen_drain_queue(tw_dev);
+		if (error) {
+			printk(KERN_WARNING "3w-xxxx: scsi%d: AEN drain failed, retrying.\n", tw_dev->host->host_no);
+			tries++;
+			continue;
+		}
+
+		/* Check for controller errors */
+		if (tw_check_errors(tw_dev)) {
+			printk(KERN_WARNING "3w-xxxx: scsi%d: Controller errors found, retrying.\n", tw_dev->host->host_no);
+			tries++;
+			continue;
+		}
+
+		/* Now the controller is in a good state */
+		break;
+	}
+
+	if (tries >= TW_MAX_RESET_TRIES) {
+		printk(KERN_WARNING "3w-xxxx: scsi%d: Controller errors, card not responding, check all cabling.\n", tw_dev->host->host_no);
+		return 1;
+	}
+
+	error = tw_initconnection(tw_dev, TW_INIT_MESSAGE_CREDITS);
+	if (error) {
+		printk(KERN_WARNING "3w-xxxx: scsi%d: Connection initialization failed.\n", tw_dev->host->host_no);
+		return 1;
+	}
+
+	error = tw_setfeature(tw_dev, 2, 1, &c);
+	if (error) {
+		printk(KERN_WARNING "3w-xxxx: Unable to set features for card, probable old firmware or card.\n");
+	}
+
+	return 0;
+} /* End tw_reset_sequence() */
+
+/* This function will initialize the fields of a device extension */
+static int tw_initialize_device_extension(TW_Device_Extension *tw_dev)
+{
+	int i, error=0;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_initialize_device_extension()\n");
+
+	/* Initialize command packet buffers */
+	error = tw_allocate_memory(tw_dev, sizeof(TW_Command), 0);
+	if (error) {
+		printk(KERN_WARNING "3w-xxxx: Command packet memory allocation failed.\n");
+		return 1;
+	}
+
+	/* Initialize generic buffer */
+	error = tw_allocate_memory(tw_dev, sizeof(TW_Sector), 1);
+	if (error) {
+		printk(KERN_WARNING "3w-xxxx: Generic memory allocation failed.\n");
+		return 1;
+	}
+
+	for (i=0;i<TW_Q_LENGTH;i++) {
+		tw_dev->free_queue[i] = i;
+		tw_dev->state[i] = TW_S_INITIAL;
+	}
+
+	tw_dev->pending_head = TW_Q_START;
+	tw_dev->pending_tail = TW_Q_START;
+	tw_dev->chrdev_request_id = TW_IOCTL_CHRDEV_FREE;
+
+	init_MUTEX(&tw_dev->ioctl_sem);
+	init_waitqueue_head(&tw_dev->ioctl_wqueue);
+
+	return 0;
+} /* End tw_initialize_device_extension() */
+
+static int tw_map_scsi_sg_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
+{
+	int use_sg;
+
+	dprintk(KERN_WARNING "3w-xxxx: tw_map_scsi_sg_data()\n");
+	
+	if (cmd->use_sg == 0)
+		return 0;
+
+	use_sg = pci_map_sg(pdev, cmd->buffer, cmd->use_sg, DMA_BIDIRECTIONAL);
+	
+	if (use_sg == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_map_scsi_sg_data(): pci_map_sg() failed.\n");
+		return 0;
+	}
+
+	cmd->SCp.phase = TW_PHASE_SGLIST;
+	cmd->SCp.have_data_in = use_sg;
+	
+	return use_sg;
+} /* End tw_map_scsi_sg_data() */
+
+static u32 tw_map_scsi_single_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
+{
+	dma_addr_t mapping;
+
+	dprintk(KERN_WARNING "3w-xxxx: tw_map_scsi_single_data()\n");
+
+	if (cmd->request_bufflen == 0)
+		return 0;
+
+	mapping = pci_map_page(pdev, virt_to_page(cmd->request_buffer), offset_in_page(cmd->request_buffer), cmd->request_bufflen, DMA_BIDIRECTIONAL);
+
+	if (mapping == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_map_scsi_single_data(): pci_map_page() failed.\n");
+		return 0;
+	}
+
+	cmd->SCp.phase = TW_PHASE_SINGLE;
+	cmd->SCp.have_data_in = mapping;
+
+	return mapping;
+} /* End tw_map_scsi_single_data() */
+
+static void tw_unmap_scsi_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
+{
+	dprintk(KERN_WARNING "3w-xxxx: tw_unmap_scsi_data()\n");
+
+	switch(cmd->SCp.phase) {
+		case TW_PHASE_SINGLE:
+			pci_unmap_page(pdev, cmd->SCp.have_data_in, cmd->request_bufflen, DMA_BIDIRECTIONAL);
+			break;
+		case TW_PHASE_SGLIST:
+			pci_unmap_sg(pdev, cmd->request_buffer, cmd->use_sg, DMA_BIDIRECTIONAL);
+			break;
+	}
+} /* End tw_unmap_scsi_data() */
+
+/* This function will reset a device extension */
+static int tw_reset_device_extension(TW_Device_Extension *tw_dev, int ioctl_reset) 
+{
+	int i = 0;
+	struct scsi_cmnd *srb;
+	unsigned long flags = 0;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_reset_device_extension()\n");
+
+	set_bit(TW_IN_RESET, &tw_dev->flags);
+	TW_DISABLE_INTERRUPTS(tw_dev);
+	TW_MASK_COMMAND_INTERRUPT(tw_dev);
+	spin_lock_irqsave(tw_dev->host->host_lock, flags);
+
+	/* Abort all requests that are in progress */
+	for (i=0;i<TW_Q_LENGTH;i++) {
+		if ((tw_dev->state[i] != TW_S_FINISHED) && 
+		    (tw_dev->state[i] != TW_S_INITIAL) &&
+		    (tw_dev->state[i] != TW_S_COMPLETED)) {
+			srb = tw_dev->srb[i];
+			if (srb != NULL) {
+				srb->result = (DID_RESET << 16);
+				tw_dev->srb[i]->scsi_done(tw_dev->srb[i]);
+				tw_unmap_scsi_data(tw_dev->tw_pci_dev, tw_dev->srb[i]);
+			}
+		}
+	}
+
+	/* Reset queues and counts */
+	for (i=0;i<TW_Q_LENGTH;i++) {
+		tw_dev->free_queue[i] = i;
+		tw_dev->state[i] = TW_S_INITIAL;
+	}
+	tw_dev->free_head = TW_Q_START;
+	tw_dev->free_tail = TW_Q_START;
+	tw_dev->posted_request_count = 0;
+	tw_dev->pending_request_count = 0;
+	tw_dev->pending_head = TW_Q_START;
+	tw_dev->pending_tail = TW_Q_START;
+	tw_dev->reset_print = 0;
+
+	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
+
+	if (tw_reset_sequence(tw_dev)) {
+		printk(KERN_WARNING "3w-xxxx: scsi%d: Reset sequence failed.\n", tw_dev->host->host_no);
+		return 1;
+	}
+	TW_ENABLE_AND_CLEAR_INTERRUPTS(tw_dev);
+
+	/* Wake up any ioctl that was pending before the reset */
+	if ((tw_dev->chrdev_request_id == TW_IOCTL_CHRDEV_FREE) || (ioctl_reset)) {
+		clear_bit(TW_IN_RESET, &tw_dev->flags);
+	} else {
+		tw_dev->chrdev_request_id = TW_IOCTL_CHRDEV_FREE;
+		wake_up(&tw_dev->ioctl_wqueue);
+	}
+
+	return 0;
+} /* End tw_reset_device_extension() */
+
+/* This funciton returns unit geometry in cylinders/heads/sectors */
+static int tw_scsi_biosparam(struct scsi_device *sdev, struct block_device *bdev,
+		sector_t capacity, int geom[]) 
+{
+	int heads, sectors, cylinders;
+	TW_Device_Extension *tw_dev;
+	
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsi_biosparam()\n");
+	tw_dev = (TW_Device_Extension *)sdev->host->hostdata;
+
+	heads = 64;
+	sectors = 32;
+	cylinders = sector_div(capacity, heads * sectors);
+
+	if (capacity >= 0x200000) {
+		heads = 255;
+		sectors = 63;
+		cylinders = sector_div(capacity, heads * sectors);
+	}
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsi_biosparam(): heads = %d, sectors = %d, cylinders = %d\n", heads, sectors, cylinders);
+	geom[0] = heads;			 
+	geom[1] = sectors;
+	geom[2] = cylinders;
+
+	return 0;
+} /* End tw_scsi_biosparam() */
+
+/* This is the new scsi eh reset function */
+static int tw_scsi_eh_reset(struct scsi_cmnd *SCpnt) 
+{
+	TW_Device_Extension *tw_dev=NULL;
+	int retval = FAILED;
+
+	tw_dev = (TW_Device_Extension *)SCpnt->device->host->hostdata;
+
+	spin_unlock_irq(tw_dev->host->host_lock);
+
+	tw_dev->num_resets++;
+
+	printk(KERN_WARNING "3w-xxxx: scsi%d: WARNING: Unit #%d: Command (0x%x) timed out, resetting card.\n", tw_dev->host->host_no, SCpnt->device->id, SCpnt->cmnd[0]);
+
+	/* Now reset the card and some of the device extension data */
+	if (tw_reset_device_extension(tw_dev, 0)) {
+		printk(KERN_WARNING "3w-xxxx: scsi%d: Reset failed.\n", tw_dev->host->host_no);
+		goto out;
+	}
+
+	retval = SUCCESS;
+out:
+	spin_lock_irq(tw_dev->host->host_lock);
+	return retval;
+} /* End tw_scsi_eh_reset() */
+
+/* This function handles scsi inquiry commands */
+static int tw_scsiop_inquiry(TW_Device_Extension *tw_dev, int request_id)
+{
+	TW_Param *param;
+	TW_Command *command_packet;
+	unsigned long command_que_value;
+	unsigned long param_value;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_inquiry()\n");
+
+	/* Initialize command packet */
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+	if (command_packet == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_inquiry(): Bad command packet virtual address.\n");
+		return 1;
+	}
+	memset(command_packet, 0, sizeof(TW_Sector));
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_GET_PARAM);
+	command_packet->size = 4;
+	command_packet->request_id = request_id;
+	command_packet->status = 0;
+	command_packet->flags = 0;
+	command_packet->byte6.parameter_count = 1;
+
+	/* Now setup the param */
+	if (tw_dev->alignment_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_inquiry(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	memset(param, 0, sizeof(TW_Sector));
+	param->table_id = 3;	 /* unit summary table */
+	param->parameter_id = 3; /* unitsstatus parameter */
+	param->parameter_size_bytes = TW_MAX_UNITS;
+	param_value = tw_dev->alignment_physical_address[request_id];
+	if (param_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_inquiry(): Bad alignment physical address.\n");
+		return 1;
+	}
+
+	command_packet->byte8.param.sgl[0].address = param_value;
+	command_packet->byte8.param.sgl[0].length = sizeof(TW_Sector);
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	if (command_que_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_inquiry(): Bad command packet physical address.\n");
+		return 1;
+	}
+
+	/* Now try to post the command packet */
+	tw_post_command_packet(tw_dev, request_id);
+
+	return 0;
+} /* End tw_scsiop_inquiry() */
+
+/* This function is called by the isr to complete an inquiry command */
+static int tw_scsiop_inquiry_complete(TW_Device_Extension *tw_dev, int request_id)
+{
+	unsigned char *is_unit_present;
+	unsigned char *request_buffer;
+	TW_Param *param;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_inquiry_complete()\n");
+
+	/* Fill request buffer */
+	if (tw_dev->srb[request_id]->request_buffer == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_inquiry_complete(): Request buffer NULL.\n");
+		return 1;
+	}
+	request_buffer = tw_dev->srb[request_id]->request_buffer;
+	memset(request_buffer, 0, tw_dev->srb[request_id]->request_bufflen);
+	request_buffer[0] = TYPE_DISK; /* Peripheral device type */
+	request_buffer[1] = 0;	       /* Device type modifier */
+	request_buffer[2] = 0;	       /* No ansi/iso compliance */
+	request_buffer[4] = 31;	       /* Additional length */
+	memcpy(&request_buffer[8], "3ware   ", 8);	 /* Vendor ID */
+	sprintf(&request_buffer[16], "Logical Disk %-2d ", tw_dev->srb[request_id]->device->id);
+	memcpy(&request_buffer[32], TW_DRIVER_VERSION, 3);
+
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	if (param == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_inquiry_complete(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	is_unit_present = &(param->data[0]);
+
+	if (is_unit_present[tw_dev->srb[request_id]->device->id] & TW_UNIT_ONLINE) {
+		tw_dev->is_unit_present[tw_dev->srb[request_id]->device->id] = 1;
+	} else {
+		tw_dev->is_unit_present[tw_dev->srb[request_id]->device->id] = 0;
+		tw_dev->srb[request_id]->result = (DID_BAD_TARGET << 16);
+		return TW_ISR_DONT_RESULT;
+	}
+
+	return 0;
+} /* End tw_scsiop_inquiry_complete() */
+
+/* This function handles scsi mode_sense commands */
+static int tw_scsiop_mode_sense(TW_Device_Extension *tw_dev, int request_id)
+{
+	TW_Param *param;
+	TW_Command *command_packet;
+	unsigned long command_que_value;
+	unsigned long param_value;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_mode_sense()\n");
+
+	/* Only page control = 0, page code = 0x8 (cache page) supported */
+	if (tw_dev->srb[request_id]->cmnd[2] != 0x8) {
+		tw_dev->state[request_id] = TW_S_COMPLETED;
+		tw_state_request_finish(tw_dev, request_id);
+		tw_dev->srb[request_id]->result = (DID_OK << 16);
+		tw_dev->srb[request_id]->scsi_done(tw_dev->srb[request_id]);
+		return 0;
+	}
+
+	/* Now read firmware cache setting for this unit */
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+	if (command_packet == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_mode_sense(): Bad command packet virtual address.\n");
+		return 1;
+	}
+
+	/* Setup the command packet */
+	memset(command_packet, 0, sizeof(TW_Sector));
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_GET_PARAM);
+	command_packet->size = 4;
+	command_packet->request_id = request_id;
+	command_packet->status = 0;
+	command_packet->flags = 0;
+	command_packet->byte6.parameter_count = 1;
+
+	/* Setup the param */
+	if (tw_dev->alignment_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_mode_sense(): Bad alignment virtual address.\n");
+		return 1;
+	}
+
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	memset(param, 0, sizeof(TW_Sector));
+	param->table_id = TW_UNIT_INFORMATION_TABLE_BASE + tw_dev->srb[request_id]->device->id;
+	param->parameter_id = 7; /* unit flags */
+	param->parameter_size_bytes = 1;
+	param_value = tw_dev->alignment_physical_address[request_id];
+	if (param_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_mode_sense(): Bad alignment physical address.\n");
+		return 1;
+	}
+
+	command_packet->byte8.param.sgl[0].address = param_value;
+	command_packet->byte8.param.sgl[0].length = sizeof(TW_Sector);
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	if (command_que_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_mode_sense(): Bad command packet physical address.\n");
+		return 1;
+	}
+
+	/* Now try to post the command packet */
+	tw_post_command_packet(tw_dev, request_id);
+	
+	return 0;
+} /* End tw_scsiop_mode_sense() */
+
+/* This function is called by the isr to complete a mode sense command */
+static int tw_scsiop_mode_sense_complete(TW_Device_Extension *tw_dev, int request_id)
+{
+	TW_Param *param;
+	unsigned char *flags;
+	unsigned char *request_buffer;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_mode_sense_complete()\n");
+
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	if (param == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_mode_sense_complete(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	flags = (char *)&(param->data[0]);
+	request_buffer = tw_dev->srb[request_id]->buffer;
+	memset(request_buffer, 0, tw_dev->srb[request_id]->request_bufflen);
+
+	request_buffer[0] = 0xf;        /* mode data length */
+	request_buffer[1] = 0;          /* default medium type */
+	request_buffer[2] = 0x10;       /* dpo/fua support on */
+	request_buffer[3] = 0;          /* no block descriptors */
+	request_buffer[4] = 0x8;        /* caching page */
+	request_buffer[5] = 0xa;        /* page length */
+	if (*flags & 0x1)
+		request_buffer[6] = 0x4;        /* WCE on */
+	else
+		request_buffer[6] = 0x0;        /* WCE off */
+
+	return 0;
+} /* End tw_scsiop_mode_sense_complete() */
+
+/* This function handles scsi read_capacity commands */
+static int tw_scsiop_read_capacity(TW_Device_Extension *tw_dev, int request_id) 
+{
+	TW_Param *param;
+	TW_Command *command_packet;
+	unsigned long command_que_value;
+	unsigned long param_value;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_capacity()\n");
+
+	/* Initialize command packet */
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+
+	if (command_packet == NULL) {
+		dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_capacity(): Bad command packet virtual address.\n");
+		return 1;
+	}
+	memset(command_packet, 0, sizeof(TW_Sector));
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_GET_PARAM);
+	command_packet->size = 4;
+	command_packet->request_id = request_id;
+	command_packet->unit__hostid = TW_UNITHOST_IN(0, tw_dev->srb[request_id]->device->id);
+	command_packet->status = 0;
+	command_packet->flags = 0;
+	command_packet->byte6.block_count = 1;
+
+	/* Now setup the param */
+	if (tw_dev->alignment_virtual_address[request_id] == NULL) {
+		dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_capacity(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	memset(param, 0, sizeof(TW_Sector));
+	param->table_id = TW_UNIT_INFORMATION_TABLE_BASE + 
+	tw_dev->srb[request_id]->device->id;
+	param->parameter_id = 4;	/* unitcapacity parameter */
+	param->parameter_size_bytes = 4;
+	param_value = tw_dev->alignment_physical_address[request_id];
+	if (param_value == 0) {
+		dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_capacity(): Bad alignment physical address.\n");
+		return 1;
+	}
+  
+	command_packet->byte8.param.sgl[0].address = param_value;
+	command_packet->byte8.param.sgl[0].length = sizeof(TW_Sector);
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	if (command_que_value == 0) {
+		dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_capacity(): Bad command packet physical address.\n");
+		return 1;
+	}
+
+	/* Now try to post the command to the board */
+	tw_post_command_packet(tw_dev, request_id);
+  
+	return 0;
+} /* End tw_scsiop_read_capacity() */
+
+/* This function is called by the isr to complete a readcapacity command */
+static int tw_scsiop_read_capacity_complete(TW_Device_Extension *tw_dev, int request_id)
+{
+	unsigned char *param_data;
+	u32 capacity;
+	char *buff;
+	TW_Param *param;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_capacity_complete()\n");
+
+	buff = tw_dev->srb[request_id]->request_buffer;
+	if (buff == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_read_capacity_complete(): Request buffer NULL.\n");
+		return 1;
+	}
+	memset(buff, 0, tw_dev->srb[request_id]->request_bufflen);
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	if (param == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_read_capacity_complete(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	param_data = &(param->data[0]);
+
+	capacity = (param_data[3] << 24) | (param_data[2] << 16) | 
+		   (param_data[1] << 8) | param_data[0];
+
+	/* Subtract one sector to fix get last sector ioctl */
+	capacity -= 1;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_capacity_complete(): Capacity = 0x%x.\n", capacity);
+
+	/* Number of LBA's */
+	buff[0] = (capacity >> 24);
+	buff[1] = (capacity >> 16) & 0xff;
+	buff[2] = (capacity >> 8) & 0xff;
+	buff[3] = capacity & 0xff;
+
+	/* Block size in bytes (512) */
+	buff[4] = (TW_BLOCK_SIZE >> 24);
+	buff[5] = (TW_BLOCK_SIZE >> 16) & 0xff;
+	buff[6] = (TW_BLOCK_SIZE >> 8) & 0xff;
+	buff[7] = TW_BLOCK_SIZE & 0xff;
+
+	return 0;
+} /* End tw_scsiop_read_capacity_complete() */
+
+/* This function handles scsi read or write commands */
+static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id) 
+{
+	TW_Command *command_packet;
+	unsigned long command_que_value;
+	u32 lba = 0x0, num_sectors = 0x0, buffaddr = 0x0;
+	int i, use_sg;
+	struct scsi_cmnd *srb;
+	struct scatterlist *sglist;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_write()\n");
+
+	if (tw_dev->srb[request_id]->request_buffer == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_read_write(): Request buffer NULL.\n");
+		return 1;
+	}
+	sglist = (struct scatterlist *)tw_dev->srb[request_id]->request_buffer;
+	srb = tw_dev->srb[request_id];
+
+	/* Initialize command packet */
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+	if (command_packet == NULL) {
+		dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_write(): Bad command packet virtual address.\n");
+		return 1;
+	}
+
+	if (srb->cmnd[0] == READ_6 || srb->cmnd[0] == READ_10) {
+		command_packet->opcode__sgloffset = TW_OPSGL_IN(3, TW_OP_READ);
+	} else {
+		command_packet->opcode__sgloffset = TW_OPSGL_IN(3, TW_OP_WRITE);
+	}
+
+	command_packet->size = 3;
+	command_packet->request_id = request_id;
+	command_packet->unit__hostid = TW_UNITHOST_IN(0, srb->device->id);
+	command_packet->status = 0;
+	command_packet->flags = 0;
+
+	if (srb->cmnd[0] == WRITE_10) {
+		if ((srb->cmnd[1] & 0x8) || (srb->cmnd[1] & 0x10))
+			command_packet->flags = 1;
+	}
+
+	if (srb->cmnd[0] == READ_6 || srb->cmnd[0] == WRITE_6) {
+		lba = ((u32)srb->cmnd[1] << 16) | ((u32)srb->cmnd[2] << 8) | (u32)srb->cmnd[3];
+		num_sectors = (u32)srb->cmnd[4];
+	} else {
+		lba = ((u32)srb->cmnd[2] << 24) | ((u32)srb->cmnd[3] << 16) | ((u32)srb->cmnd[4] << 8) | (u32)srb->cmnd[5];
+		num_sectors = (u32)srb->cmnd[8] | ((u32)srb->cmnd[7] << 8);
+	}
+  
+	/* Update sector statistic */
+	tw_dev->sector_count = num_sectors;
+	if (tw_dev->sector_count > tw_dev->max_sector_count)
+		tw_dev->max_sector_count = tw_dev->sector_count;
+  
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_write(): lba = 0x%x num_sectors = 0x%x\n", lba, num_sectors);
+	command_packet->byte8.io.lba = lba;
+	command_packet->byte6.block_count = num_sectors;
+
+	/* Do this if there are no sg list entries */
+	if (tw_dev->srb[request_id]->use_sg == 0) {    
+		dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_write(): SG = 0\n");
+		buffaddr = tw_map_scsi_single_data(tw_dev->tw_pci_dev, tw_dev->srb[request_id]);
+		if (buffaddr == 0)
+			return 1;
+
+		command_packet->byte8.io.sgl[0].address = buffaddr;
+		command_packet->byte8.io.sgl[0].length = tw_dev->srb[request_id]->request_bufflen;
+		command_packet->size+=2;
+	}
+
+	/* Do this if we have multiple sg list entries */
+	if (tw_dev->srb[request_id]->use_sg > 0) {
+		use_sg = tw_map_scsi_sg_data(tw_dev->tw_pci_dev, tw_dev->srb[request_id]);
+		if (use_sg == 0)
+			return 1;
+
+		for (i=0;i<use_sg; i++) {
+			command_packet->byte8.io.sgl[i].address = sg_dma_address(&sglist[i]);
+			command_packet->byte8.io.sgl[i].length = sg_dma_len(&sglist[i]);
+			command_packet->size+=2;
+		}
+	}
+
+	/* Update SG statistics */
+	tw_dev->sgl_entries = tw_dev->srb[request_id]->use_sg;
+	if (tw_dev->sgl_entries > tw_dev->max_sgl_entries)
+		tw_dev->max_sgl_entries = tw_dev->sgl_entries;
+
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	if (command_que_value == 0) {
+		dprintk(KERN_WARNING "3w-xxxx: tw_scsiop_read_write(): Bad command packet physical address.\n");
+		return 1;
+	}
+      
+	/* Now try to post the command to the board */
+	tw_post_command_packet(tw_dev, request_id);
+
+	return 0;
+} /* End tw_scsiop_read_write() */
+
+/* This function will handle the request sense scsi command */
+static int tw_scsiop_request_sense(TW_Device_Extension *tw_dev, int request_id)
+{
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_request_sense()\n");
+
+	/* For now we just zero the request buffer */
+	memset(tw_dev->srb[request_id]->request_buffer, 0, tw_dev->srb[request_id]->request_bufflen);
+	tw_dev->state[request_id] = TW_S_COMPLETED;
+	tw_state_request_finish(tw_dev, request_id);
+
+	/* If we got a request_sense, we probably want a reset, return error */
+	tw_dev->srb[request_id]->result = (DID_ERROR << 16);
+	tw_dev->srb[request_id]->scsi_done(tw_dev->srb[request_id]);
+
+	return 0;
+} /* End tw_scsiop_request_sense() */
+
+/* This function will handle synchronize cache scsi command */
+static int tw_scsiop_synchronize_cache(TW_Device_Extension *tw_dev, int request_id)
+{
+	TW_Command *command_packet;
+	unsigned long command_que_value;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_synchronize_cache()\n");
+
+	/* Send firmware flush command for this unit */
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+	if (command_packet == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_synchronize_cache(): Bad command packet virtual address.\n");
+		return 1;
+	}
+
+	/* Setup the command packet */
+	memset(command_packet, 0, sizeof(TW_Sector));
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(0, TW_OP_FLUSH_CACHE);
+	command_packet->size = 2;
+	command_packet->request_id = request_id;
+	command_packet->unit__hostid = TW_UNITHOST_IN(0, tw_dev->srb[request_id]->device->id);
+	command_packet->status = 0;
+	command_packet->flags = 0;
+	command_packet->byte6.parameter_count = 1;
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	if (command_que_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_synchronize_cache(): Bad command packet physical address.\n");
+		return 1;
+	}
+
+	/* Now try to post the command packet */
+	tw_post_command_packet(tw_dev, request_id);
+
+	return 0;
+} /* End tw_scsiop_synchronize_cache() */
+
+/* This function will handle test unit ready scsi command */
+static int tw_scsiop_test_unit_ready(TW_Device_Extension *tw_dev, int request_id)
+{
+	TW_Param *param;
+	TW_Command *command_packet;
+	unsigned long command_que_value;
+	unsigned long param_value;
+
+	dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_test_unit_ready()\n");
+
+	/* Initialize command packet */
+	command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+	if (command_packet == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_test_unit_ready(): Bad command packet virtual address.\n");
+		return 1;
+	}
+	memset(command_packet, 0, sizeof(TW_Sector));
+	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_GET_PARAM);
+	command_packet->size = 4;
+	command_packet->request_id = request_id;
+	command_packet->status = 0;
+	command_packet->flags = 0;
+	command_packet->byte6.parameter_count = 1;
+
+	/* Now setup the param */
+	if (tw_dev->alignment_virtual_address[request_id] == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_test_unit_ready(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	memset(param, 0, sizeof(TW_Sector));
+	param->table_id = 3;	 /* unit summary table */
+	param->parameter_id = 3; /* unitsstatus parameter */
+	param->parameter_size_bytes = TW_MAX_UNITS;
+	param_value = tw_dev->alignment_physical_address[request_id];
+	if (param_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_test_unit_ready(): Bad alignment physical address.\n");
+		return 1;
+	}
+
+	command_packet->byte8.param.sgl[0].address = param_value;
+	command_packet->byte8.param.sgl[0].length = sizeof(TW_Sector);
+	command_que_value = tw_dev->command_packet_physical_address[request_id];
+	if (command_que_value == 0) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_test_unit_ready(): Bad command packet physical address.\n");
+		return 1;
+	}
+
+	/* Now try to post the command packet */
+	tw_post_command_packet(tw_dev, request_id);
+
+	return 0;
+} /* End tw_scsiop_test_unit_ready() */
+
+/* This function is called by the isr to complete a testunitready command */
+static int tw_scsiop_test_unit_ready_complete(TW_Device_Extension *tw_dev, int request_id)
+{
+	unsigned char *is_unit_present;
+	TW_Param *param;
+
+	dprintk(KERN_WARNING "3w-xxxx: tw_scsiop_test_unit_ready_complete()\n");
+
+	param = (TW_Param *)tw_dev->alignment_virtual_address[request_id];
+	if (param == NULL) {
+		printk(KERN_WARNING "3w-xxxx: tw_scsiop_test_unit_ready_complete(): Bad alignment virtual address.\n");
+		return 1;
+	}
+	is_unit_present = &(param->data[0]);
+
+	if (is_unit_present[tw_dev->srb[request_id]->device->id] & TW_UNIT_ONLINE) {
+		tw_dev->is_unit_present[tw_dev->srb[request_id]->device->id] = 1;
+	} else {
+		tw_dev->is_unit_present[tw_dev->srb[request_id]->device->id] = 0;
+		tw_dev->srb[request_id]->result = (DID_BAD_TARGET << 16);
+		return TW_ISR_DONT_RESULT;
+	}
+
+	return 0;
+} /* End tw_scsiop_test_unit_ready_complete() */
+
+/* This is the main scsi queue function to handle scsi opcodes */
+static int tw_scsi_queue(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) 
+{
+	unsigned char *command = SCpnt->cmnd;
+	int request_id = 0;
+	int retval = 1;
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)SCpnt->device->host->hostdata;
+
+	/* Save done function into Scsi_Cmnd struct */
+	SCpnt->scsi_done = done;
+		 
+	/* Queue the command and get a request id */
+	tw_state_request_start(tw_dev, &request_id);
+
+	/* Save the scsi command for use by the ISR */
+	tw_dev->srb[request_id] = SCpnt;
+
+	/* Initialize phase to zero */
+	SCpnt->SCp.phase = TW_PHASE_INITIAL;
+
+	switch (*command) {
+		case READ_10:
+		case READ_6:
+		case WRITE_10:
+		case WRITE_6:
+			dprintk(KERN_NOTICE "3w-xxxx: tw_scsi_queue(): caught READ/WRITE.\n");
+			retval = tw_scsiop_read_write(tw_dev, request_id);
+			break;
+		case TEST_UNIT_READY:
+			dprintk(KERN_NOTICE "3w-xxxx: tw_scsi_queue(): caught TEST_UNIT_READY.\n");
+			retval = tw_scsiop_test_unit_ready(tw_dev, request_id);
+			break;
+		case INQUIRY:
+			dprintk(KERN_NOTICE "3w-xxxx: tw_scsi_queue(): caught INQUIRY.\n");
+			retval = tw_scsiop_inquiry(tw_dev, request_id);
+			break;
+		case READ_CAPACITY:
+			dprintk(KERN_NOTICE "3w-xxxx: tw_scsi_queue(): caught READ_CAPACITY.\n");
+			retval = tw_scsiop_read_capacity(tw_dev, request_id);
+			break;
+	        case REQUEST_SENSE:
+		        dprintk(KERN_NOTICE "3w-xxxx: tw_scsi_queue(): caught REQUEST_SENSE.\n");
+		        retval = tw_scsiop_request_sense(tw_dev, request_id);
+		        break;
+		case MODE_SENSE:
+			dprintk(KERN_NOTICE "3w-xxxx: tw_scsi_queue(): caught MODE_SENSE.\n");
+			retval = tw_scsiop_mode_sense(tw_dev, request_id);
+			break;
+		case SYNCHRONIZE_CACHE:
+			dprintk(KERN_NOTICE "3w-xxxx: tw_scsi_queue(): caught SYNCHRONIZE_CACHE.\n");
+			retval = tw_scsiop_synchronize_cache(tw_dev, request_id);
+			break;
+		case TW_IOCTL:
+			printk(KERN_WARNING "3w-xxxx: SCSI_IOCTL_SEND_COMMAND deprecated, please update your 3ware tools.\n");
+			break;
+		default:
+			printk(KERN_NOTICE "3w-xxxx: scsi%d: Unknown scsi opcode: 0x%x\n", tw_dev->host->host_no, *command);
+			tw_dev->state[request_id] = TW_S_COMPLETED;
+			tw_state_request_finish(tw_dev, request_id);
+			SCpnt->result = (DID_BAD_TARGET << 16);
+			done(SCpnt);
+			retval = 0;
+	}
+	if (retval) {
+		tw_dev->state[request_id] = TW_S_COMPLETED;
+		tw_state_request_finish(tw_dev, request_id);
+		SCpnt->result = (DID_ERROR << 16);
+		done(SCpnt);
+		retval = 0;
+	}
+	return retval;
+} /* End tw_scsi_queue() */
+
+/* This function is the interrupt service routine */
+static irqreturn_t tw_interrupt(int irq, void *dev_instance,
+		     struct pt_regs *regs) 
+{
+	int request_id;
+	u32 status_reg_value;
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)dev_instance;
+	TW_Response_Queue response_que;
+	int error = 0, retval = 0;
+	TW_Command *command_packet;
+	int handled = 0;
+
+	/* Get the host lock for io completions */
+	spin_lock(tw_dev->host->host_lock);
+
+	/* Read the registers */
+	status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+
+	/* Check if this is our interrupt, otherwise bail */
+	if (!(status_reg_value & TW_STATUS_VALID_INTERRUPT))
+		goto tw_interrupt_bail;
+
+	handled = 1;
+
+	/* Check controller for errors */
+	if (tw_check_bits(status_reg_value)) {
+		dprintk(KERN_WARNING "3w-xxxx: tw_interrupt(): Unexpected bits.\n");
+		if (tw_decode_bits(tw_dev, status_reg_value, 1)) {
+			TW_CLEAR_ALL_INTERRUPTS(tw_dev);
+			goto tw_interrupt_bail;
+		}
+	}
+
+	/* Handle host interrupt */
+	if (status_reg_value & TW_STATUS_HOST_INTERRUPT) {
+		dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): Received host interrupt.\n");
+		TW_CLEAR_HOST_INTERRUPT(tw_dev);
+	}
+
+	/* Handle attention interrupt */
+	if (status_reg_value & TW_STATUS_ATTENTION_INTERRUPT) {
+		dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): Received attention interrupt.\n");
+		TW_CLEAR_ATTENTION_INTERRUPT(tw_dev);
+		tw_state_request_start(tw_dev, &request_id);
+		error = tw_aen_read_queue(tw_dev, request_id);
+		if (error) {
+			printk(KERN_WARNING "3w-xxxx: scsi%d: Error reading aen queue.\n", tw_dev->host->host_no);
+			tw_dev->state[request_id] = TW_S_COMPLETED;
+			tw_state_request_finish(tw_dev, request_id);
+		}
+	}
+
+	/* Handle command interrupt */
+	if (status_reg_value & TW_STATUS_COMMAND_INTERRUPT) {
+		/* Drain as many pending commands as we can */
+		while (tw_dev->pending_request_count > 0) {
+			request_id = tw_dev->pending_queue[tw_dev->pending_head];
+			if (tw_dev->state[request_id] != TW_S_PENDING) {
+				printk(KERN_WARNING "3w-xxxx: scsi%d: Found request id that wasn't pending.\n", tw_dev->host->host_no);
+				break;
+			}
+			if (tw_post_command_packet(tw_dev, request_id)==0) {
+				if (tw_dev->pending_head == TW_Q_LENGTH-1) {
+					tw_dev->pending_head = TW_Q_START;
+				} else {
+					tw_dev->pending_head = tw_dev->pending_head + 1;
+				}
+				tw_dev->pending_request_count--;
+			} else {
+				/* If we get here, we will continue re-posting on the next command interrupt */
+				break;
+			}
+		}
+		/* If there are no more pending requests, we mask command interrupt */
+		if (tw_dev->pending_request_count == 0) 
+			TW_MASK_COMMAND_INTERRUPT(tw_dev);
+	}
+
+	/* Handle response interrupt */
+	if (status_reg_value & TW_STATUS_RESPONSE_INTERRUPT) {
+		/* Drain the response queue from the board */
+		while ((status_reg_value & TW_STATUS_RESPONSE_QUEUE_EMPTY) == 0) {
+			/* Read response queue register */
+			response_que.value = inl(TW_RESPONSE_QUEUE_REG_ADDR(tw_dev));
+			request_id = TW_RESID_OUT(response_que.response_id);
+			command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
+			error = 0;
+
+			/* Check for bad response */
+			if (command_packet->status != 0) {
+				/* If internal command, don't error, don't fill sense */
+				if (tw_dev->srb[request_id] == NULL) {
+					tw_decode_sense(tw_dev, request_id, 0);
+				} else {
+					error = tw_decode_sense(tw_dev, request_id, 1);
+				}
+			}
+
+			/* Check for correct state */
+			if (tw_dev->state[request_id] != TW_S_POSTED) {
+				if (tw_dev->srb[request_id] != NULL) {
+					printk(KERN_WARNING "3w-xxxx: scsi%d: Received a request id that wasn't posted.\n", tw_dev->host->host_no);
+					error = 1;
+				}
+			}
+
+			dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): Response queue request id: %d.\n", request_id);
+
+			/* Check for internal command completion */
+			if (tw_dev->srb[request_id] == NULL) {
+				dprintk(KERN_WARNING "3w-xxxx: tw_interrupt(): Found internally posted command.\n");
+				/* Check for chrdev ioctl completion */
+				if (request_id != tw_dev->chrdev_request_id) {
+					retval = tw_aen_complete(tw_dev, request_id);
+					if (retval) {
+						printk(KERN_WARNING "3w-xxxx: scsi%d: Error completing aen.\n", tw_dev->host->host_no);
+					}
+				} else {
+					tw_dev->chrdev_request_id = TW_IOCTL_CHRDEV_FREE;
+					wake_up(&tw_dev->ioctl_wqueue);
+				}
+			} else {
+				switch (tw_dev->srb[request_id]->cmnd[0]) {
+				case READ_10:
+				case READ_6:
+					dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): caught READ_10/READ_6\n");
+					break;
+				case WRITE_10:
+				case WRITE_6:
+					dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): caught WRITE_10/WRITE_6\n");
+					break;
+				case TEST_UNIT_READY:
+					dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): caught TEST_UNIT_READY\n");
+					error = tw_scsiop_test_unit_ready_complete(tw_dev, request_id);
+					break;
+				case INQUIRY:
+					dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): caught INQUIRY\n");
+					error = tw_scsiop_inquiry_complete(tw_dev, request_id);
+					break;
+				case READ_CAPACITY:
+					dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): caught READ_CAPACITY\n");
+					error = tw_scsiop_read_capacity_complete(tw_dev, request_id);
+					break;
+				case MODE_SENSE:
+					dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): caught MODE_SENSE\n");
+					error = tw_scsiop_mode_sense_complete(tw_dev, request_id);
+					break;
+				case SYNCHRONIZE_CACHE:
+					dprintk(KERN_NOTICE "3w-xxxx: tw_interrupt(): caught SYNCHRONIZE_CACHE\n");
+					break;
+				default:
+					printk(KERN_WARNING "3w-xxxx: case slip in tw_interrupt()\n");
+					error = 1;
+				}
+
+				/* If no error command was a success */
+				if (error == 0) {
+					tw_dev->srb[request_id]->result = (DID_OK << 16);
+				}
+
+				/* If error, command failed */
+				if (error == 1) {
+					/* Ask for a host reset */
+					tw_dev->srb[request_id]->result = (DID_OK << 16) | (CHECK_CONDITION << 1);
+				}
+
+				/* Now complete the io */
+				if ((error != TW_ISR_DONT_COMPLETE)) {
+					tw_dev->state[request_id] = TW_S_COMPLETED;
+					tw_state_request_finish(tw_dev, request_id);
+					tw_dev->posted_request_count--;
+					tw_dev->srb[request_id]->scsi_done(tw_dev->srb[request_id]);
+					
+					tw_unmap_scsi_data(tw_dev->tw_pci_dev, tw_dev->srb[request_id]);
+				}
+			}
+				
+			/* Check for valid status after each drain */
+			status_reg_value = inl(TW_STATUS_REG_ADDR(tw_dev));
+			if (tw_check_bits(status_reg_value)) {
+				dprintk(KERN_WARNING "3w-xxxx: tw_interrupt(): Unexpected bits.\n");
+				if (tw_decode_bits(tw_dev, status_reg_value, 1)) {
+					TW_CLEAR_ALL_INTERRUPTS(tw_dev);
+					goto tw_interrupt_bail;
+				}
+			}
+		}
+	}
+
+tw_interrupt_bail:
+	spin_unlock(tw_dev->host->host_lock);
+	return IRQ_RETVAL(handled);
+} /* End tw_interrupt() */
+
+/* This function tells the controller to shut down */
+static void __tw_shutdown(TW_Device_Extension *tw_dev)
+{
+	/* Disable interrupts */
+	TW_DISABLE_INTERRUPTS(tw_dev);
+
+	printk(KERN_WARNING "3w-xxxx: Shutting down host %d.\n", tw_dev->host->host_no);
+
+	/* Tell the card we are shutting down */
+	if (tw_initconnection(tw_dev, 1)) {
+		printk(KERN_WARNING "3w-xxxx: Connection shutdown failed.\n");
+	} else {
+		printk(KERN_WARNING "3w-xxxx: Shutdown complete.\n");
+	}
+
+	/* Clear all interrupts just before exit */
+	TW_ENABLE_AND_CLEAR_INTERRUPTS(tw_dev);
+} /* End __tw_shutdown() */
+
+/* Wrapper for __tw_shutdown */
+static void tw_shutdown(struct device *dev)
+{
+	struct Scsi_Host *host = pci_get_drvdata(to_pci_dev(dev));
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
+
+	__tw_shutdown(tw_dev);
+} /* End tw_shutdown() */
+
+static struct scsi_host_template driver_template = {
+	.module			= THIS_MODULE,
+	.name			= "3ware Storage Controller",
+	.queuecommand		= tw_scsi_queue,
+	.eh_host_reset_handler	= tw_scsi_eh_reset,
+	.bios_param		= tw_scsi_biosparam,
+	.change_queue_depth	= tw_change_queue_depth,
+	.can_queue		= TW_Q_LENGTH-2,
+	.this_id		= -1,
+	.sg_tablesize		= TW_MAX_SGL_LENGTH,
+	.max_sectors		= TW_MAX_SECTORS,
+	.cmd_per_lun		= TW_MAX_CMDS_PER_LUN,	
+	.use_clustering		= ENABLE_CLUSTERING,
+	.shost_attrs		= tw_host_attrs,
+	.emulated		= 1
+};
+
+/* This function will probe and initialize a card */
+static int __devinit tw_probe(struct pci_dev *pdev, const struct pci_device_id *dev_id)
+{
+	struct Scsi_Host *host = NULL;
+	TW_Device_Extension *tw_dev;
+	int retval = -ENODEV;
+
+	retval = pci_enable_device(pdev);
+	if (retval) {
+		printk(KERN_WARNING "3w-xxxx: Failed to enable pci device.");
+		goto out_disable_device;
+	}
+
+	pci_set_master(pdev);
+
+	retval = pci_set_dma_mask(pdev, TW_DMA_MASK);
+	if (retval) {
+		printk(KERN_WARNING "3w-xxxx: Failed to set dma mask.");
+		goto out_disable_device;
+	}
+
+	host = scsi_host_alloc(&driver_template, sizeof(TW_Device_Extension));
+	if (!host) {
+		printk(KERN_WARNING "3w-xxxx: Failed to allocate memory for device extension.");
+		retval = -ENOMEM;
+		goto out_disable_device;
+	}
+	tw_dev = (TW_Device_Extension *)host->hostdata;
+
+	memset(tw_dev, 0, sizeof(TW_Device_Extension));
+
+	/* Save values to device extension */
+	tw_dev->host = host;
+	tw_dev->tw_pci_dev = pdev;
+
+	if (tw_initialize_device_extension(tw_dev)) {
+		printk(KERN_WARNING "3w-xxxx: Failed to initialize device extension.");
+		goto out_free_device_extension;
+	}
+
+	/* Request IO regions */
+	retval = pci_request_regions(pdev, "3w-xxxx");
+	if (retval) {
+		printk(KERN_WARNING "3w-xxxx: Failed to get mem region.");
+		goto out_free_device_extension;
+	}
+
+	/* Save base address */
+	tw_dev->base_addr = pci_resource_start(pdev, 0);
+	if (!tw_dev->base_addr) {
+		printk(KERN_WARNING "3w-xxxx: Failed to get io address.");
+		goto out_release_mem_region;
+	}
+
+	/* Disable interrupts on the card */
+	TW_DISABLE_INTERRUPTS(tw_dev);
+
+	/* Initialize the card */
+	if (tw_reset_sequence(tw_dev))
+		goto out_release_mem_region;
+
+	/* Set host specific parameters */
+	host->max_id = TW_MAX_UNITS;
+	host->max_cmd_len = TW_MAX_CDB_LEN;
+
+	/* Luns and channels aren't supported by adapter */
+	host->max_lun = 0;
+	host->max_channel = 0;
+
+	/* Register the card with the kernel SCSI layer */
+	retval = scsi_add_host(host, &pdev->dev);
+	if (retval) {
+		printk(KERN_WARNING "3w-xxxx: scsi add host failed");
+		goto out_release_mem_region;
+	}
+
+	pci_set_drvdata(pdev, host);
+
+	printk(KERN_WARNING "3w-xxxx: scsi%d: Found a 3ware Storage Controller at 0x%x, IRQ: %d.\n", host->host_no, tw_dev->base_addr, pdev->irq);
+
+	/* Now setup the interrupt handler */
+	retval = request_irq(pdev->irq, tw_interrupt, SA_SHIRQ, "3w-xxxx", tw_dev);
+	if (retval) {
+		printk(KERN_WARNING "3w-xxxx: Error requesting IRQ.");
+		goto out_remove_host;
+	}
+
+	tw_device_extension_list[tw_device_extension_count] = tw_dev;
+	tw_device_extension_count++;
+
+	/* Re-enable interrupts on the card */
+	TW_ENABLE_AND_CLEAR_INTERRUPTS(tw_dev);
+
+	/* Finally, scan the host */
+	scsi_scan_host(host);
+
+	if (twe_major == -1) {
+		if ((twe_major = register_chrdev (0, "twe", &tw_fops)) < 0)
+			printk(KERN_WARNING "3w-xxxx: Failed to register character device.");
+	}
+	return 0;
+
+out_remove_host:
+	scsi_remove_host(host);
+out_release_mem_region:
+	pci_release_regions(pdev);
+out_free_device_extension:
+	tw_free_device_extension(tw_dev);
+	scsi_host_put(host);
+out_disable_device:
+	pci_disable_device(pdev);
+
+	return retval;
+} /* End tw_probe() */
+
+/* This function is called to remove a device */
+static void tw_remove(struct pci_dev *pdev)
+{
+	struct Scsi_Host *host = pci_get_drvdata(pdev);
+	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
+
+	scsi_remove_host(tw_dev->host);
+
+	/* Unregister character device */
+	if (twe_major >= 0) {
+		unregister_chrdev(twe_major, "twe");
+		twe_major = -1;
+	}
+
+	/* Free up the IRQ */
+	free_irq(tw_dev->tw_pci_dev->irq, tw_dev);
+
+	/* Shutdown the card */
+	__tw_shutdown(tw_dev);
+
+	/* Free up the mem region */
+	pci_release_regions(pdev);
+
+	/* Free up device extension resources */
+	tw_free_device_extension(tw_dev);
+
+	scsi_host_put(tw_dev->host);
+	pci_disable_device(pdev);
+	tw_device_extension_count--;
+} /* End tw_remove() */
+
+/* PCI Devices supported by this driver */
+static struct pci_device_id tw_pci_tbl[] __devinitdata = {
+	{ PCI_VENDOR_ID_3WARE, PCI_DEVICE_ID_3WARE_1000,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{ PCI_VENDOR_ID_3WARE, PCI_DEVICE_ID_3WARE_7000,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, tw_pci_tbl);
+
+/* pci_driver initializer */
+static struct pci_driver tw_driver = {
+	.name		= "3w-xxxx",
+	.id_table	= tw_pci_tbl,
+	.probe		= tw_probe,
+	.remove		= tw_remove,
+	.driver		= {
+		.shutdown = tw_shutdown
+	}
+};
+
+/* This function is called on driver initialization */
+static int __init tw_init(void)
+{
+	printk(KERN_WARNING "3ware Storage Controller device driver for Linux v%s.\n", TW_DRIVER_VERSION);
+
+	return pci_module_init(&tw_driver);
+} /* End tw_init() */
+
+/* This function is called on driver exit */
+static void __exit tw_exit(void)
+{
+	pci_unregister_driver(&tw_driver);
+} /* End tw_exit() */
+
+module_init(tw_init);
+module_exit(tw_exit);
+