From: Tomas Henzl <thenzl@redhat.com>
Date: Mon, 10 Dec 2007 17:41:35 +0100
Subject: [scsi] update megaraid_sas to version 3.15
Message-id: 475D6C3F.4080001@redhat.com
O-Subject: [RHEL-5.2 PATCH] bz243154 Update megaraid_sas to version 3.15
Bugzilla: 243154

The patch below comes from LSI, and brings the RHEL-5 driver up to
date for 5.2. I have tested it using bonnie++ and verify-data (x86_64).

The patch can be found on James Bottomley git (git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6.git),
 the "poll_mode_io" being an exception to this, is only posted on lkml - http://lkml.org/lkml/2007/11/9/188

It resolves 243154 and also 353131.

Here is the change list:

1. Cmd completion from reset path (without depending on the isr).
2. SYNCHRONIZE_CACHE is not supported by FW and thus blocked by driver.
3. Hibernation support added
4. Setting the max_sectors_per_req based on max SGL supported by the FW.
5. Increased MFI_POLL_TIMEOUT_SECS to 60 seconds from 10. FW may take a max of
   60 seconds to respond to the INIT cmd
6. Added module parameter "poll_mode_io" to support for "polling" (reduced
   interrupt operation). If set, cmds will also be completed from IO path.
7. Corrected company name from LSI Logic to LSI

And here is the patch:

diff --git a/Documentation/scsi/ChangeLog.megaraid_sas b/Documentation/scsi/ChangeLog.megaraid_sas
index 5eb9275..2a66690 100644
--- a/Documentation/scsi/ChangeLog.megaraid_sas
+++ b/Documentation/scsi/ChangeLog.megaraid_sas
@@ -1,20 +1,185 @@
 
-1 Release Date    : Mon Oct 02 11:21:32 PDT 2006 - Sumant Patro <Sumant.Patro@lsil.com>
+1 Release Date    : Wed. Nov. 21 10:29:45 PST 2007 -
+			(emaild-id:megaraidlinux@lsi.com)
+			Sumant Patro
+			Bo Yang 
+
+2 Current Version : 00.00.03.15-RH1
+3 Older Version   : 00.00.03.15
+
+1. Removed fast_load, max_sectors, cmd_per_lun module parameters
+
+2. Corrected company name from LSI Logic to LSI
+
+1 Release Date    : Fri. Sep. 07 16:30:43 PST 2007 -
+			(emaild-id:megaraidlinux@lsi.com)
+			Sumant Patro
+			Bo Yang 
+
+2 Current Version : 00.00.03.15
+3 Older Version   : 00.00.03.14
+
+1. Added module parameter "poll_mode_io" to support for "polling" (reduced interrupt operation).
+	In this mode, IO completion interrupts are delayed. At the end of initiating IOs,
+	the driver schedules for cmd completion if there are pending cmds to be completed.
+	A timer-based interrupt has also been added to prevent IO completion processing from
+	being delayed indefinitely in the case that no new IOs are initiated.
+
+1 Release Date    : Fri. Sep. 07 16:30:43 PST 2007 -
+			(emaild-id:megaraidlinux@lsi.com)
+			Sumant Patro
+			Bo Yang 
+
+2 Current Version : 00.00.03.14
+3 Older Version   : 00.00.03.13
+
+1. Setting the max_sectors_per_req based on max SGL supported by the FW. Prior versions calculated 
+	this value from controller info (max_sectors_1, max_sectors_2). For certain controllers/FW,
+	this was resulting in a value greater than max SGL supported by the FW. Issue was first
+	reported by users running LUKS+XFS with megaraid_sas.
+	Thanks to RB for providing the logs and duplication steps that helped to get to the root 
+	cause of the issue.
+2. Increased MFI_POLL_TIMEOUT_SECS to 60 seconds from 10. FW may take a max of 60 seconds to 
+	respond to the INIT cmd.
+
+1 Release Date    : Fri. June. 15 16:30:43 PST 2007 -
+			(emaild-id:megaraidlinux@lsi.com)
+			Sumant Patro
+			Bo Yang 
+
+2 Current Version : 00.00.03.13
+3 Older Version   : 00.00.03.12
+
+1. Added the megasas_reset_timer routine to intercept cmd timeout and throttle io.
+
+On Fri, 2007-03-16 at 16:44 -0600, James Bottomley wrote:
+It looks like megaraid_sas at least needs this to throttle its commands
+> as they begin to time out.  The code keeps the existing transport
+> template use of eh_timed_out (and allows the transport to override the
+> host if they both have this callback).
+> 
+> James
+
+1 Release Date    : Sat May. 12 16:30:43 PST 2007 -
+			(emaild-id:megaraidlinux@lsi.com)
+			Sumant Patro
+			Bo Yang 
+
+2 Current Version : 00.00.03.12
+3 Older Version   : 00.00.03.11
+
+1.  When MegaSAS driver receives reset call from OS, driver waits in reset
+routine for max 3 minutes for all pending command completion. Now driver will
+call completion routine every 5 seconds from the reset routine instead of
+waiting for depending on cmd completion from isr path.
+
+1 Release Date    : Mon Apr. 30 10:25:52 PST 2007 -
+			(emaild-id:megaraidlinux@lsi.com)
+			Sumant Patro
+			Bo Yang 
+
+2 Current Version : 00.00.03.11
+3 Older Version   : 00.00.03.09
+
+	1. Following module parameters added -
+		fast_load: Faster loading of the driver, skips physical devices scanning thereby
+			reducing the time to load driver.
+		cmd_per_lun: Maximum number of commands per logical unit
+		max_sectors: Maximum number of sectors per IO command
+	2. Memory Manager for IOCTL removed for 2.6 kernels.
+	   pci_alloc_consistent replaced by dma_alloc_coherent. With this 
+	   change there is no need of memory manager in the driver code
+
+	On Wed, 2007-02-07 at 13:30 -0800, Andrew Morton wrote:
+	> I suspect all this horror is due to stupidity in the DMA API.
+	>
+	> pci_alloc_consistent() just goes and assumes GFP_ATOMIC, whereas
+	> the caller (megasas_mgmt_fw_ioctl) would have been perfectly happy
+	> to use GFP_KERNEL.
+	>
+	> I bet this fixes it
+
+	It does, but the DMA API was expanded to cope with this exact case, so
+	use dma_alloc_coherent() directly in the megaraid code instead.  The dev
+	is just &pci_dev->dev.
+
+	James <James.Bottomley@SteelEye.com>
+
+	3. SYNCHRONIZE_CACHE is not supported by FW and thus blocked by driver.
+	4. Hibernation support added
+	5. Performing diskdump while running IO in RHEL 4 was failing. Fixed.
+		
+1 Release Date    : Fri Feb. 09 14:36:28 PST 2007 -
+			(emaild-id:megaraidlinux@lsi.com)
+			Sumant Patro
+			Bo Yang 
+
+2 Current Version : 00.00.03.09
+3 Older Version   : 00.00.03.08
+
+i.	Under heavy IO mid-layer prints "DRIVER_TIMEOUT" errors  
+
+	The driver now waits for 10 seconds to elapse instead of 5 (as in
+	previous release) to resume IO.
+
+1 Release Date    : Mon Feb. 05 11:35:24 PST 2007 -
+			(emaild-id:megaraidlinux@lsi.com)
+			Sumant Patro
+			Bo Yang 
+2 Current Version : 00.00.03.08
+3 Older Version   : 00.00.03.07
+
+i.	Under heavy IO mid-layer prints "DRIVER_TIMEOUT" errors  
+
+	Fix:	The driver is now throttling IO.
+	Checks added in megasas_queue_command to know if FW is able to 
+	process commands within timeout period. If number of retries
+	is 2 or greater,the driver stops sending cmd to FW temporarily. IO is
+	resumed if pending cmd count reduces to 16 or 5 seconds has elapsed
+	from the time cmds were last sent to FW.
+
+ii.	FW enables WCE bit in Mode Sense cmd for drives that are configured 
+	as WriteBack. The OS may send "SYNCHRONIZE_CACHE" cmd when Logical
+	Disks are exposed with WCE=1. User is advised to enable Write Back
+	mode only when the controller has battery backup. At this time 
+	Synhronize cache is not supported by the FW. Driver will short-cycle 
+	the cmd and return sucess without sending down to FW.
+
+1 Release Date    : Sun Jan. 14 11:21:32 PDT 2007 -
+		 Sumant Patro <Sumant.Patro@lsil.com>/Bo Yang
+2 Current Version : 00.00.03.07
+3 Older Version   : 00.00.03.06
+
+i.	bios_param entry added in scsi_host_template that returns disk geometry
+	information.
+
+1 Release Date    : Fri Oct 20 11:21:32 PDT 2006 - Sumant Patro <Sumant.Patro@lsil.com>/Bo Yang
+2 Current Version : 00.00.03.06
+3 Older Version   : 00.00.03.05
+
+1. Added new memory management module to support the IOCTL memory allocation. For IOCTL we try to allocate from the memory pool created during driver initialization. If mem pool is empty then we allocate at run time.
+2. Added check in megasas_queue_command and dpc/isr routine to see if we have already declared adapter dead
+   (hw_crit_error=1). If hw_crit_error==1, now we donot accept any processing of pending cmds/accept any cmd from OS
+
+1 Release Date    : Fri Oct 20 11:21:32 PDT 2006 - Sumant Patro <Sumant.Patro@lsil.com>
 2 Current Version : 00.00.03.05
 3 Older Version   : 00.00.03.04
 
 i.	PCI_DEVICE macro used
-
-	Convert the pci_device_id-table of the megaraid_sas-driver to the PCI_DEVICE-macro, to safe some lines.
-
-		- Henrik Kretzschmar <henne@nachtwindheim.de>
+	Convert the pci_device_id-table of the megaraid_sas-driver to the PCI_DEVICE-macro, to save some lines.
 ii.	All compiler warnings removed
 iii.	megasas_ctrl_info struct reverted to 3.02 release
 iv.	Default value of megasas_dbg_lvl set to 0
 v.	Removing in megasas_exit the sysfs entry created for megasas_dbg_lvl
 vi.	In megasas_teardown_frame_pool(), cmd->frame was passed instead of
-	cmd->sense to pci_pool_free. Fixed. Bug was pointed out by
-	Eric Sesterhenn
+	cmd->sense to pci_pool_free. Fixed. 
+vii.	Removed reboot notify for 2.6 kernels. PCI driver->shutdown fires the flush command.
+viii. In request_irq SA_SHIRQ replaced by IRQF_SHARED for latest kernel code
+ix.	Return value in call to clear_user used to verify success
+x.	pci_module_init replaced by pci_register_driver for latest kernel and SLES 10
+xi.	return value of driver_create_file handled
+xii.	Defined MFI_INIT_ABORT as 1 instead of 0
+xiii.	Removed MAX_ARRAYS_DEDICATED (not used)
 
 1 Release Date    : Wed Sep 13 14:22:51 PDT 2006 - Sumant Patro <Sumant.Patro@lsil.com>
 2 Current Version : 00.00.03.04
diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index ec799fe..8738357 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -2,7 +2,7 @@
  *
  *		Linux MegaRAID driver for SAS based RAID controllers
  *
- * Copyright (c) 2003-2005  LSI Logic Corporation.
+ * Copyright (c) 2003-2005  LSI Corporation.
  *
  *	   This program is free software; you can redistribute it and/or
  *	   modify it under the terms of the GNU General Public License
@@ -10,11 +10,13 @@
  *	   2 of the License, or (at your option) any later version.
  *
  * FILE		: megaraid_sas.c
- * Version	: v00.00.03.10
+ * Version	: v00.00.03.15-RH1
  *
  * Authors:
- * 	Sreenivas Bagalkote	<Sreenivas.Bagalkote@lsi.com>
- * 	Sumant Patro		<Sumant.Patro@lsi.com>
+ *	(email-id : megaraidlinux@lsi.com)
+ * 	Sreenivas Bagalkote
+ * 	Sumant Patro
+ *	Bo Yang
  *
  * List of supported controllers
  *
@@ -44,10 +46,22 @@
 #include <scsi/scsi_host.h>
 #include "megaraid_sas.h"
 
+/*
+ * Module parameters
+ */
+
+/*
+ * poll_mode_io:1- schedule command completion from q cmd
+ */
+static unsigned int poll_mode_io;
+module_param_named(poll_mode_io, poll_mode_io, int, 0);
+MODULE_PARM_DESC(poll_mode_io,
+	"Complete cmds from IO path, (default=0)");
+
 MODULE_LICENSE("GPL");
 MODULE_VERSION(MEGASAS_VERSION);
 MODULE_AUTHOR("megaraidlinux@lsi.com");
-MODULE_DESCRIPTION("LSI Logic MegaRAID SAS Driver");
+MODULE_DESCRIPTION("LSI MegaRAID SAS Driver");
 
 /*
  * PCI ID table for all supported controllers
@@ -74,6 +88,9 @@ static DEFINE_MUTEX(megasas_async_queue_mutex);
 
 static u32 megasas_dbg_lvl;
 
+static void
+megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
+		     u8 alt_status);
 /**
  * megasas_get_cmd -	Get a command from the free pool
  * @instance:		Adapter soft state
@@ -893,6 +910,12 @@ megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
 
 	instance->instancet->fire_cmd(cmd->frame_phys_addr ,cmd->frame_count-1,instance->reg_set);
 
+	/*
+	 * Check if we have pend cmds to be completed
+	 */
+	if (poll_mode_io && atomic_read(&instance->fw_outstanding))
+		tasklet_schedule(&instance->isr_tasklet);
+
 	return 0;
 
  out_return_cmd:
@@ -923,6 +946,65 @@ static int megasas_slave_configure(struct scsi_device *sdev)
 }
 
 /**
+ * megasas_complete_cmd_dpc	 -	Returns FW's controller structure
+ * @instance_addr:			Address of adapter soft state
+ *
+ * Tasklet to complete cmds
+ */
+static void megasas_complete_cmd_dpc(unsigned long instance_addr)
+{
+	u32 producer;
+	u32 consumer;
+	u32 context;
+	struct megasas_cmd *cmd;
+	struct megasas_instance *instance =
+			(struct megasas_instance *)instance_addr;
+	unsigned long flags;
+
+	/* If we have already declared adapter dead, donot complete cmds */
+	if (instance->hw_crit_error)
+		return;
+
+	spin_lock_irqsave(&instance->completion_lock, flags);
+
+	producer = *instance->producer;
+	consumer = *instance->consumer;
+
+	while (consumer != producer) {
+		context = instance->reply_queue[consumer];
+
+		cmd = instance->cmd_list[context];
+
+		megasas_complete_cmd(instance, cmd, DID_OK);
+
+		consumer++;
+		if (consumer == (instance->max_fw_cmds + 1)) {
+			consumer = 0;
+		}
+	}
+
+	*instance->consumer = producer;
+
+	spin_unlock_irqrestore(&instance->completion_lock, flags);
+
+	/*
+	 * Check if we can restore can_queue
+	 */
+	if (instance->flag & MEGASAS_FW_BUSY
+		&& time_after(jiffies, instance->last_time + 5 * HZ)
+		&& atomic_read(&instance->fw_outstanding) < 17) {
+
+		spin_lock_irqsave(instance->host->host_lock, flags);
+		instance->flag &= ~MEGASAS_FW_BUSY;
+		instance->host->can_queue =
+				instance->max_fw_cmds - MEGASAS_INT_CMDS;
+
+		spin_unlock_irqrestore(instance->host->host_lock, flags);
+	}
+
+}
+
+/**
  * megasas_wait_for_outstanding -	Wait for all outstanding cmds
  * @instance:				Adapter soft state
  *
@@ -945,6 +1027,11 @@ static int megasas_wait_for_outstanding(struct megasas_instance *instance)
 		if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
 			printk(KERN_NOTICE "megasas: [%2d]waiting for %d "
 			       "commands to complete\n",i,outstanding);
+			/*
+			 * Call cmd completion routine. Cmd to be
+			 * be completed directly without depending on isr.
+			 */
+			megasas_complete_cmd_dpc((unsigned long)instance);
 		}
 
 		msleep(1000);
@@ -1137,7 +1224,7 @@ megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
 static struct scsi_host_template megasas_template = {
 
 	.module = THIS_MODULE,
-	.name = "LSI Logic SAS based MegaRAID driver",
+	.name = "LSI SAS based MegaRAID driver",
 	.proc_name = "megaraid_sas",
 	.slave_configure = megasas_slave_configure,
 	.queuecommand = megasas_queue_command,
@@ -1827,57 +1914,120 @@ megasas_get_ctrl_info(struct megasas_instance *instance,
 }
 
 /**
- * megasas_complete_cmd_dpc	 -	Returns FW's controller structure
- * @instance_addr:			Address of adapter soft state
+ * megasas_issue_init_mfi -	Initializes the FW
+ * @instance:		Adapter soft state
  *
- * Tasklet to complete cmds
+ * Issues the INIT MFI cmd
  */
-static void megasas_complete_cmd_dpc(unsigned long instance_addr)
+static int
+megasas_issue_init_mfi(struct megasas_instance *instance)
 {
-	u32 producer;
-	u32 consumer;
 	u32 context;
+
 	struct megasas_cmd *cmd;
-	struct megasas_instance *instance = (struct megasas_instance *)instance_addr;
-	unsigned long flags;
 
-	/* If we have already declared adapter dead, donot complete cmds */
-	if (instance->hw_crit_error)
-		return;
+	struct megasas_init_frame *init_frame;
+	struct megasas_init_queue_info *initq_info;
+	dma_addr_t init_frame_h;
+	dma_addr_t initq_info_h;
 
-	producer = *instance->producer;
-	consumer = *instance->consumer;
+	/*
+	 * Prepare a init frame. Note the init frame points to queue info
+	 * structure. Each frame has SGL allocated after first 64 bytes. For
+	 * this frame - since we don't need any SGL - we use SGL's space as
+	 * queue info structure
+	 *
+	 * We will not get a NULL command below. We just created the pool.
+	 */
+	cmd = megasas_get_cmd(instance);
 
-	while (consumer != producer) {
-		context = instance->reply_queue[consumer];
+	init_frame = (struct megasas_init_frame *)cmd->frame;
+	initq_info = (struct megasas_init_queue_info *)
+	    ((unsigned long)init_frame + 64);
 
-		cmd = instance->cmd_list[context];
+	init_frame_h = cmd->frame_phys_addr;
+	initq_info_h = init_frame_h + 64;
 
-		megasas_complete_cmd(instance, cmd, DID_OK);
+	context = init_frame->context;
+	memset(init_frame, 0, MEGAMFI_FRAME_SIZE);
+	memset(initq_info, 0, sizeof(struct megasas_init_queue_info));
+	init_frame->context = context;
 
-		consumer++;
-		if (consumer == (instance->max_fw_cmds + 1)) {
-			consumer = 0;
-		}
-	}
+	initq_info->reply_queue_entries = instance->max_fw_cmds + 1;
+	initq_info->reply_queue_start_phys_addr_lo = instance->reply_queue_h;
 
-	*instance->consumer = producer;
+	initq_info->producer_index_phys_addr_lo = instance->producer_h;
+	initq_info->consumer_index_phys_addr_lo = instance->consumer_h;
+
+	init_frame->cmd = MFI_CMD_INIT;
+	init_frame->cmd_status = 0xFF;
+	init_frame->queue_info_new_phys_addr_lo = initq_info_h;
+
+	init_frame->data_xfer_len = sizeof(struct megasas_init_queue_info);
 
 	/*
-	 * Check if we can restore can_queue
+	 * disable the intr before firing the init frame to FW
 	 */
-	if (instance->flag & MEGASAS_FW_BUSY
-		&& time_after(jiffies, instance->last_time + 5 * HZ)
-		&& atomic_read(&instance->fw_outstanding) < 17) {
+	instance->instancet->disable_intr(instance->reg_set);
 
-		spin_lock_irqsave(instance->host->host_lock, flags);
-		instance->flag &= ~MEGASAS_FW_BUSY;
-		instance->host->can_queue =
-				instance->max_fw_cmds - MEGASAS_INT_CMDS;
+	/*
+	 * Issue the init frame in polled mode
+	 */
 
-		spin_unlock_irqrestore(instance->host->host_lock, flags);
+	if (megasas_issue_polled(instance, cmd)) {
+		printk(KERN_ERR "megasas: Failed to init firmware\n");
+		megasas_return_cmd(instance, cmd);
+		goto fail_fw_init;
 	}
 
+	megasas_return_cmd(instance, cmd);
+
+	return 0;
+
+fail_fw_init:
+	return -EINVAL;
+}
+
+/**
+ * megasas_start_timer - Initializes a timer object
+ * @instance:		Adapter soft state
+ * @timer:		timer object to be initialized
+ * @fn:			timer function
+ * @interval:		time interval between timer function call
+ *
+ */
+static inline void
+megasas_start_timer(struct megasas_instance *instance,
+			struct timer_list *timer,
+			void *fn, unsigned long interval)
+{
+	init_timer(timer);
+	timer->expires = jiffies + interval;
+	timer->data = (unsigned long)instance;
+	timer->function = fn;
+	add_timer(timer);
+}
+
+/**
+ * megasas_io_completion_timer - Timer fn
+ * @instance_addr:	Address of adapter soft state
+ *
+ * Schedules tasklet for cmd completion
+ * if poll_mode_io is set
+ */
+static void
+megasas_io_completion_timer(unsigned long instance_addr)
+{
+	struct megasas_instance *instance =
+			(struct megasas_instance *)instance_addr;
+
+	if (atomic_read(&instance->fw_outstanding))
+		tasklet_schedule(&instance->isr_tasklet);
+
+	/* Restart timer */
+	if (poll_mode_io)
+		mod_timer(&instance->io_completion_timer,
+			jiffies + MEGASAS_COMPLETION_TIMER_INTERVAL);
 }
 
 /**
@@ -1892,22 +2042,17 @@ static int megasas_init_mfi(struct megasas_instance *instance)
 	u32 reply_q_sz;
 	u32 max_sectors_1;
 	u32 max_sectors_2;
+	u32 tmp_sectors;
 	struct megasas_register_set __iomem *reg_set;
 
-	struct megasas_cmd *cmd;
 	struct megasas_ctrl_info *ctrl_info;
 
-	struct megasas_init_frame *init_frame;
-	struct megasas_init_queue_info *initq_info;
-	dma_addr_t init_frame_h;
-	dma_addr_t initq_info_h;
-
 	/*
 	 * Map the message registers
 	 */
 	instance->base_addr = pci_resource_start(instance->pdev, 0);
 
-	if (pci_request_regions(instance->pdev, "megasas: LSI Logic")) {
+	if (pci_request_regions(instance->pdev, "megasas: LSI")) {
 		printk(KERN_DEBUG "megasas: IO memory region busy!\n");
 		return -EBUSY;
 	}
@@ -1978,52 +2123,8 @@ static int megasas_init_mfi(struct megasas_instance *instance)
 		goto fail_reply_queue;
 	}
 
-	/*
-	 * Prepare a init frame. Note the init frame points to queue info
-	 * structure. Each frame has SGL allocated after first 64 bytes. For
-	 * this frame - since we don't need any SGL - we use SGL's space as
-	 * queue info structure
-	 *
-	 * We will not get a NULL command below. We just created the pool.
-	 */
-	cmd = megasas_get_cmd(instance);
-
-	init_frame = (struct megasas_init_frame *)cmd->frame;
-	initq_info = (struct megasas_init_queue_info *)
-	    ((unsigned long)init_frame + 64);
-
-	init_frame_h = cmd->frame_phys_addr;
-	initq_info_h = init_frame_h + 64;
-
-	memset(init_frame, 0, MEGAMFI_FRAME_SIZE);
-	memset(initq_info, 0, sizeof(struct megasas_init_queue_info));
-
-	initq_info->reply_queue_entries = instance->max_fw_cmds + 1;
-	initq_info->reply_queue_start_phys_addr_lo = instance->reply_queue_h;
-
-	initq_info->producer_index_phys_addr_lo = instance->producer_h;
-	initq_info->consumer_index_phys_addr_lo = instance->consumer_h;
-
-	init_frame->cmd = MFI_CMD_INIT;
-	init_frame->cmd_status = 0xFF;
-	init_frame->queue_info_new_phys_addr_lo = initq_info_h;
-
-	init_frame->data_xfer_len = sizeof(struct megasas_init_queue_info);
-
-	/*
-	 * disable the intr before firing the init frame to FW
-	 */
-	instance->instancet->disable_intr(instance->reg_set);
-
-	/*
-	 * Issue the init frame in polled mode
-	 */
-	if (megasas_issue_polled(instance, cmd)) {
-		printk(KERN_DEBUG "megasas: Failed to init firmware\n");
+	if (megasas_issue_init_mfi(instance))
 		goto fail_fw_init;
-	}
-
-	megasas_return_cmd(instance, cmd);
 
 	ctrl_info = kmalloc(sizeof(struct megasas_ctrl_info), GFP_KERNEL);
 
@@ -2036,30 +2137,39 @@ static int megasas_init_mfi(struct megasas_instance *instance)
 	 * Note that older firmwares ( < FW ver 30) didn't report information
 	 * to calculate max_sectors_1. So the number ended up as zero always.
 	 */
+	tmp_sectors = 0;
 	if (ctrl_info && !megasas_get_ctrl_info(instance, ctrl_info)) {
 
 		max_sectors_1 = (1 << ctrl_info->stripe_sz_ops.min) *
 		    ctrl_info->max_strips_per_io;
 		max_sectors_2 = ctrl_info->max_request_size;
 
-		instance->max_sectors_per_req = (max_sectors_1 < max_sectors_2)
+		tmp_sectors = (max_sectors_1 < max_sectors_2)
 		    ? max_sectors_1 : max_sectors_2;
-	} else
-		instance->max_sectors_per_req = instance->max_num_sge *
-		    PAGE_SIZE / 512;
+	}
+
+	instance->max_sectors_per_req = instance->max_num_sge *
+						PAGE_SIZE / 512;
+	if (tmp_sectors && (instance->max_sectors_per_req > tmp_sectors))
+		instance->max_sectors_per_req = tmp_sectors;
 
 	kfree(ctrl_info);
 
         /*
-	* Setup tasklet for cmd completion
-	*/
+	 * Setup tasklet for cmd completion
+	 */
 
-        tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
+	tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
                         (unsigned long)instance);
+
+	/* Initialize the cmd completion timer */
+	if (poll_mode_io)
+		megasas_start_timer(instance, &instance->io_completion_timer,
+				megasas_io_completion_timer,
+				MEGASAS_COMPLETION_TIMER_INTERVAL);
 	return 0;
 
       fail_fw_init:
-	megasas_return_cmd(instance, cmd);
 
 	pci_free_consistent(instance->pdev, reply_q_sz,
 			    instance->reply_queue, instance->reply_queue_h);
@@ -2320,7 +2430,7 @@ static int megasas_io_attach(struct megasas_instance *instance)
 	host->this_id = instance->init_id;
 	host->sg_tablesize = instance->max_num_sge;
 	host->max_sectors = instance->max_sectors_per_req;
-	host->cmd_per_lun = 128;
+	host->cmd_per_lun = MEGASAS_DEFAULT_CMD_PER_LUN;
 	host->max_channel = MEGASAS_MAX_CHANNELS - 1;
 	host->max_id = MEGASAS_MAX_DEV_PER_CHANNEL;
 	host->max_lun = MEGASAS_MAX_LUN;
@@ -2341,6 +2451,28 @@ static int megasas_io_attach(struct megasas_instance *instance)
 	return 0;
 }
 
+static int
+megasas_set_dma_mask(struct pci_dev *pdev)
+{
+	/*
+	 * All our contollers are capable of performing 64-bit DMA
+	 */
+	if (IS_DMA64) {
+		if (pci_set_dma_mask(pdev, DMA_64BIT_MASK) != 0) {
+
+			if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
+				goto fail_set_dma_mask;
+		}
+	} else {
+		if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
+			goto fail_set_dma_mask;
+	}
+	return 0;
+
+fail_set_dma_mask:
+	return 1;
+}
+
 /**
  * megasas_probe_one -	PCI hotplug entry point
  * @pdev:		PCI device structure
@@ -2374,19 +2506,8 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	pci_set_master(pdev);
 
-	/*
-	 * All our contollers are capable of performing 64-bit DMA
-	 */
-	if (IS_DMA64) {
-		if (pci_set_dma_mask(pdev, DMA_64BIT_MASK) != 0) {
-
-			if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
-				goto fail_set_dma_mask;
-		}
-	} else {
-		if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
-			goto fail_set_dma_mask;
-	}
+	if (megasas_set_dma_mask(pdev))
+		goto fail_set_dma_mask;
 
 	host = scsi_host_alloc(&megasas_template,
 			       sizeof(struct megasas_instance));
@@ -2435,6 +2556,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	init_waitqueue_head(&instance->abort_cmd_wait_q);
 
 	spin_lock_init(&instance->cmd_pool_lock);
+	spin_lock_init(&instance->completion_lock);
 
 	sema_init(&instance->aen_mutex, 1);
 	sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);
@@ -2568,8 +2690,10 @@ static void megasas_flush_cache(struct megasas_instance *instance)
 /**
  * megasas_shutdown_controller -	Instructs FW to shutdown the controller
  * @instance:				Adapter soft state
+ * @opcode:				Shutdown/Hibernate
  */
-static void megasas_shutdown_controller(struct megasas_instance *instance)
+static void megasas_shutdown_controller(struct megasas_instance *instance,
+					u32 opcode)
 {
 	struct megasas_cmd *cmd;
 	struct megasas_dcmd_frame *dcmd;
@@ -2592,7 +2716,7 @@ static void megasas_shutdown_controller(struct megasas_instance *instance)
 	dcmd->flags = MFI_FRAME_DIR_NONE;
 	dcmd->timeout = 0;
 	dcmd->data_xfer_len = 0;
-	dcmd->opcode = MR_DCMD_CTRL_SHUTDOWN;
+	dcmd->opcode = opcode;
 
 	megasas_issue_blocked_cmd(instance, cmd);
 
@@ -2602,6 +2726,138 @@ static void megasas_shutdown_controller(struct megasas_instance *instance)
 }
 
 /**
+ * megasas_suspend -	driver suspend entry point
+ * @pdev:		PCI device structure
+ * @state:		state
+ */
+static int __devinit
+megasas_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct Scsi_Host *host;
+	struct megasas_instance *instance;
+
+	instance = pci_get_drvdata(pdev);
+	host = instance->host;
+
+	if (poll_mode_io)
+		del_timer_sync(&instance->io_completion_timer);
+
+	megasas_flush_cache(instance);
+	megasas_shutdown_controller(instance, MR_DCMD_HIBERNATE_SHUTDOWN);
+	tasklet_kill(&instance->isr_tasklet);
+
+	pci_set_drvdata(instance->pdev, instance);
+	instance->instancet->disable_intr(instance->reg_set);
+	free_irq(instance->pdev->irq, instance);
+
+	pci_save_state(pdev);
+	pci_disable_device(pdev);
+
+	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+	return 0;
+}
+
+/**
+ * megasas_resume-	driver resume entry point
+ * @pdev:		PCI device structure
+ */
+static int __devinit
+megasas_resume(struct pci_dev *pdev)
+{
+	int rval;
+	struct Scsi_Host *host;
+	struct megasas_instance *instance;
+
+	instance = pci_get_drvdata(pdev);
+	host = instance->host;
+	pci_set_power_state(pdev, PCI_D0);
+	pci_enable_wake(pdev, PCI_D0, 0);
+	pci_restore_state(pdev);
+
+	/*
+	 * PCI prepping: enable device set bus mastering and dma mask
+	 */
+	rval = pci_enable_device(pdev);
+
+	if (rval) {
+		printk(KERN_INFO "megasas: Enable device failed\n");
+		return rval;
+	}
+
+	pci_set_master(pdev);
+
+	if (megasas_set_dma_mask(pdev))
+		goto fail_set_dma_mask;
+
+	/*
+	 * Initialize MFI Firmware
+	 */
+
+	*instance->producer = 0;
+	*instance->consumer = 0;
+
+	atomic_set(&instance->fw_outstanding, 0);
+
+	/*
+	 * We expect the FW state to be READY
+	 */
+	if (megasas_transition_to_ready(instance))
+		goto fail_ready_state;
+
+	if (megasas_issue_init_mfi(instance))
+		goto fail_init_mfi;
+
+	tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
+		(unsigned long)instance);
+	/*
+	 * Register IRQ
+	 */
+	if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED,
+		"megasas", instance)) {
+		printk(KERN_DEBUG "megasas: Failed to register IRQ\n");
+		goto fail_irq;
+	}
+
+	instance->instancet->enable_intr(instance->reg_set);
+
+	/*
+	 * Initiate AEN (Asynchronous Event Notification)
+	 */
+	if (megasas_start_aen(instance))
+		printk(KERN_ERR "megasas: Start AEN failed\n");
+
+	/* Initialize the cmd completion timer */
+	if (poll_mode_io)
+		megasas_start_timer(instance, &instance->io_completion_timer,
+				megasas_io_completion_timer,
+				MEGASAS_COMPLETION_TIMER_INTERVAL);
+
+	return 0;
+
+fail_irq:
+fail_init_mfi:
+
+	if (instance->evt_detail)
+		pci_free_consistent(pdev, sizeof(struct megasas_evt_detail),
+				    instance->evt_detail,
+				    instance->evt_detail_h);
+
+	if (instance->producer)
+		pci_free_consistent(pdev, sizeof(u32), instance->producer,
+				    instance->producer_h);
+	if (instance->consumer)
+		pci_free_consistent(pdev, sizeof(u32), instance->consumer,
+				    instance->consumer_h);
+	scsi_host_put(host);
+fail_set_dma_mask:
+fail_ready_state:
+	pci_disable_device(pdev);
+
+	return -ENODEV;
+}
+
+/**
  * megasas_detach_one -	PCI hot"un"plug entry point
  * @pdev:		PCI device structure
  */
@@ -2614,9 +2870,12 @@ static void megasas_detach_one(struct pci_dev *pdev)
 	instance = pci_get_drvdata(pdev);
 	host = instance->host;
 
+	if (poll_mode_io)
+		del_timer_sync(&instance->io_completion_timer);
+
 	scsi_remove_host(instance->host);
 	megasas_flush_cache(instance);
-	megasas_shutdown_controller(instance);
+	megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN);
 	tasklet_kill(&instance->isr_tasklet);
 
 	/*
@@ -3035,7 +3294,7 @@ megasas_mgmt_compat_ioctl(struct file *file, unsigned int cmd,
 /*
  * File operations structure for management interface
  */
-static struct file_operations megasas_mgmt_fops = {
+static const struct file_operations megasas_mgmt_fops = {
 	.owner = THIS_MODULE,
 	.open = megasas_mgmt_open,
 	.release = megasas_mgmt_release,
@@ -3055,6 +3314,8 @@ static struct pci_driver megasas_pci_driver = {
 	.id_table = megasas_pci_table,
 	.probe = megasas_probe_one,
 	.remove = __devexit_p(megasas_detach_one),
+	.suspend = megasas_suspend,
+	.resume = megasas_resume,
 	.shutdown = megasas_shutdown,
 };
 
@@ -3082,7 +3343,7 @@ static DRIVER_ATTR(release_date, S_IRUGO, megasas_sysfs_show_release_date,
 static ssize_t
 megasas_sysfs_show_dbg_lvl(struct device_driver *dd, char *buf)
 {
-	return sprintf(buf,"%u",megasas_dbg_lvl);
+	return sprintf(buf, "%u\n", megasas_dbg_lvl);
 }
 
 static ssize_t
@@ -3099,6 +3360,64 @@ megasas_sysfs_set_dbg_lvl(struct device_driver *dd, const char *buf, size_t coun
 static DRIVER_ATTR(dbg_lvl, S_IRUGO|S_IWUGO, megasas_sysfs_show_dbg_lvl,
 		   megasas_sysfs_set_dbg_lvl);
 
+static ssize_t
+megasas_sysfs_show_poll_mode_io(struct device_driver *dd, char *buf)
+{
+	return sprintf(buf, "%u\n", poll_mode_io);
+}
+
+static ssize_t
+megasas_sysfs_set_poll_mode_io(struct device_driver *dd, const char *buf,
+				size_t count)
+{
+	int retval = count;
+	int tmp = poll_mode_io;
+	int i;
+	struct megasas_instance *instance;
+
+	if (sscanf(buf, "%u", &poll_mode_io) < 1) {
+		printk(KERN_ERR "megasas: could not set poll_mode_io\n");
+		retval = -EINVAL;
+	}
+
+	/*
+	 * Check if poll_mode_io is already set or is same as previous value
+	 */
+	if ((tmp && poll_mode_io) || (tmp == poll_mode_io))
+		goto out;
+
+	if (poll_mode_io) {
+		/*
+		 * Start timers for all adapters
+		 */
+		for (i = 0; i < megasas_mgmt_info.max_index; i++) {
+			instance = megasas_mgmt_info.instance[i];
+			if (instance) {
+				megasas_start_timer(instance,
+					&instance->io_completion_timer,
+					megasas_io_completion_timer,
+					MEGASAS_COMPLETION_TIMER_INTERVAL);
+			}
+		}
+	} else {
+		/*
+		 * Delete timers for all adapters
+		 */
+		for (i = 0; i < megasas_mgmt_info.max_index; i++) {
+			instance = megasas_mgmt_info.instance[i];
+			if (instance)
+				del_timer_sync(&instance->io_completion_timer);
+		}
+	}
+
+out:
+	return retval;
+}
+
+static DRIVER_ATTR(poll_mode_io, S_IRUGO|S_IWUGO,
+			megasas_sysfs_show_poll_mode_io,
+			megasas_sysfs_set_poll_mode_io);
+
 /**
  * megasas_init - Driver load entry point
  */
@@ -3149,7 +3468,15 @@ static int __init megasas_init(void)
 	if (rval)
 		goto err_dcf_dbg_lvl;
 
+	rval = driver_create_file(&megasas_pci_driver.driver,
+				  &driver_attr_poll_mode_io);
+	if (rval)
+		goto err_dcf_poll_mode_io;
+
 	return rval;
+err_dcf_poll_mode_io:
+	driver_remove_file(&megasas_pci_driver.driver,
+			   &driver_attr_dbg_lvl);
 err_dcf_dbg_lvl:
 	driver_remove_file(&megasas_pci_driver.driver,
 			   &driver_attr_release_date);
@@ -3168,10 +3495,13 @@ err_pcidrv:
 static void __exit megasas_exit(void)
 {
 	driver_remove_file(&megasas_pci_driver.driver,
-			   &driver_attr_dbg_lvl);
+			&driver_attr_poll_mode_io);
 	driver_remove_file(&megasas_pci_driver.driver,
-			   &driver_attr_release_date);
-	driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version);
+			&driver_attr_dbg_lvl);
+	driver_remove_file(&megasas_pci_driver.driver,
+			&driver_attr_release_date);
+	driver_remove_file(&megasas_pci_driver.driver,
+			&driver_attr_version);
 
 	pci_unregister_driver(&megasas_pci_driver);
 	unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 86604bf..b26f430 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -2,7 +2,7 @@
  *
  *		Linux MegaRAID driver for SAS based RAID controllers
  *
- * Copyright (c) 2003-2005  LSI Logic Corporation.
+ * Copyright (c) 2003-2005  LSI Corporation.
  *
  *		This program is free software; you can redistribute it and/or
  *		modify it under the terms of the GNU General Public License
@@ -15,12 +15,12 @@
 #ifndef LSI_MEGARAID_SAS_H
 #define LSI_MEGARAID_SAS_H
 
-/**
+/*
  * MegaRAID SAS Driver meta data
  */
-#define MEGASAS_VERSION				"00.00.03.10"
-#define MEGASAS_RELDATE				"Mar 28, 2007"
-#define MEGASAS_EXT_VERSION			"Wed Mar 28 10:25:52 PST 2007"
+#define MEGASAS_VERSION				"00.00.03.15-RH1"
+#define MEGASAS_RELDATE				"Nov 21, 2007"
+#define MEGASAS_EXT_VERSION			"Wed Nov. 21 10:29:45 PST 2007"
 
 /*
  * Device IDs
@@ -40,7 +40,7 @@
  * "message frames"
  */
 
-/**
+/*
  * FW posts its state in upper 4 bits of outbound_msg_0 register
  */
 #define MFI_STATE_MASK				0xF0000000
@@ -58,7 +58,7 @@
 
 #define MEGAMFI_FRAME_SIZE			64
 
-/**
+/*
  * During FW init, clear pending cmds & reset state using inbound_msg_0
  *
  * ABORT	: Abort all pending cmds
@@ -78,7 +78,7 @@
 						MFI_INIT_MFIMODE| \
 						MFI_INIT_ABORT
 
-/**
+/*
  * MFI frame flags
  */
 #define MFI_FRAME_POST_IN_REPLY_QUEUE		0x0000
@@ -92,12 +92,12 @@
 #define MFI_FRAME_DIR_READ			0x0010
 #define MFI_FRAME_DIR_BOTH			0x0018
 
-/**
+/*
  * Definition for cmd_status
  */
 #define MFI_CMD_STATUS_POLL_MODE		0xFF
 
-/**
+/*
  * MFI command opcodes
  */
 #define MFI_CMD_INIT				0x00
@@ -117,6 +117,7 @@
 #define MR_FLUSH_DISK_CACHE			0x02
 
 #define MR_DCMD_CTRL_SHUTDOWN			0x01050000
+#define MR_DCMD_HIBERNATE_SHUTDOWN		0x01060000
 #define MR_ENABLE_DRIVE_SPINDOWN		0x01
 
 #define MR_DCMD_CTRL_EVENT_GET_INFO		0x01040100
@@ -128,7 +129,7 @@
 #define MR_DCMD_CLUSTER_RESET_ALL		0x08010100
 #define MR_DCMD_CLUSTER_RESET_LD		0x08010200
 
-/**
+/*
  * MFI command completion codes
  */
 enum MFI_STAT {
@@ -536,9 +537,10 @@ struct megasas_ctrl_info {
 #define MEGASAS_DEFAULT_INIT_ID			-1
 #define MEGASAS_MAX_LUN				8
 #define MEGASAS_MAX_LD				64
+#define MEGASAS_DEFAULT_CMD_PER_LUN		128
 
-#define MEGASAS_DBG_LVL				1
 
+#define MEGASAS_DBG_LVL				1
 #define MEGASAS_FW_BUSY				1
 
 /*
@@ -570,7 +572,8 @@ struct megasas_ctrl_info {
 #define IS_DMA64				(sizeof(dma_addr_t) == 8)
 
 #define MFI_OB_INTR_STATUS_MASK			0x00000002
-#define MFI_POLL_TIMEOUT_SECS			10
+#define MFI_POLL_TIMEOUT_SECS			60
+#define MEGASAS_COMPLETION_TIMER_INTERVAL	(HZ/10)
 
 #define MFI_REPLY_1078_MESSAGE_INTERRUPT	0x80000000
 
@@ -1083,6 +1086,8 @@ struct megasas_instance {
 	struct megasas_cmd **cmd_list;
 	struct list_head cmd_pool;
 	spinlock_t cmd_pool_lock;
+	/* used to synch producer, consumer ptrs */
+	spinlock_t completion_lock;
 	struct dma_pool *frame_dma_pool;
 	struct dma_pool *sense_dma_pool;
 
@@ -1108,6 +1113,8 @@ struct megasas_instance {
 
 	u8 flag;
 	unsigned long last_time;
+
+	struct timer_list io_completion_timer;
 };
 
 #define MEGASAS_IS_LOGICAL(scp)						\