From: Kevin Monroe <kmonroe@redhat.com>
Date: Mon, 16 Nov 2009 22:48:38 -0500
Subject: [scsi] ibmvscsi: upstream multipath enhancements for 5.5
Message-id: <20091116224315.13309.61344.sendpatchset@squad5-lp1.lab.bos.redhat.com>
Patchwork-id: 21387
O-Subject: [RHEL5.5 PATCH 1/1 BZ512203] ibmvscsi: Update ibmvscsi driver with
	upstream multipath enhancements
Bugzilla: 512203

RHBZ#:
======
https://bugzilla.redhat.com/show_bug.cgi?id=512203

Description:
============
This patch covers the following 6 upstream patches to be backported
to RHEL 5.5.  This patch was based on the 2.6.18-173.el5 source tree.

-- e08afeb [SCSI] ibmvscsi: Fix module load hang --
Brian King [Tue, 23 Jun 2009]

Fixes a regression seen in the ibmvscsi driver when using the VSCSI
server in SLES 9 and SLES 10. The VSCSI server in these releases
has a bug in it in which it does not send responses to unknown MADs.
Check the OS Type field in the adapter info response and do not send
these unsupported commands when talking to an older server.

-- 126c5cc [SCSI] ibmvscsi: Add support for capabilities MAD --
Brian King [Mon, 8 Jun 2009]

Add support to ibmvscsi for the capabilities MAD. This command gets sent
to the Virtual I/O server prior to login in order to communicate client
capabilities. Additionally it returns information regarding capabilities
that the server supports. The two main capabilities communicated in this
MAD are related to partition migration and client reserve. Client reserve
allows for SCSI-2 reservations to be sent to virtual disks which are backed
by physical LUNs and will result in the reservation being sent to the
physical LUN.

-- c1988e3 [SCSI] ibmvscsi: Enable fast fail feature --
Robert Jennings [Mon, 8 Jun 2009]

A new mode of error reporting, fast fail, has been added to the VIOS
which allows failover to happen more quickly.

If this new fast fail mode is enabled on the VIOS and the vSCSI client
supports the mode, the VIOS will not return MEDIUM error on path failures,
but rather return VIOSRP_ADAPTER_FAIL in the crq response, which
ibmvscsi will translate to DID_ERROR.

This new mode can be enabled for single path configurations as well,
so it is the new default error reporting mode. A module parameter is
provided to disable this new behavior on the off chance it causes a
problem on some old VIOS version.

-- 3507e13 [SCSI] ibmvscsi: Send adapter info before login --
Brian King [Mon, 8 Jun 2009]

The ibmvscsi driver currently sends the SRP Login before sending the Adapter
Info MAD, which can result in commands getting sent to the virtual adapter
before we are ready for them. This results in a slight window where the target
devices may not behave as expected. Change the order and close the window.

-- 16b3858 [SCSI] ibmvscsi: Remove redundant test on unsigned. --
Roel Kluin [Sat, 2 May 2009]

-- e637d55 [SCSI] ibmvscsi: Correct DMA mapping leak --
Robert Jennings [Thu, 22 Jan 2009]

The ibmvscsi client driver is not unmapping the SCSI command after
encountering a DMA mapping error while trying to map an indirect
scattergather list for the event pool.

RHEL Version Found:
===================
RHEL 5.4

kABI Status:
============
No symbols were harmed.

Brew:
=====
Built on all platforms.
http://brewweb.devel.redhat.com/brew/taskinfo?taskID=2073359

Test Status:
============
IBM has signed off on testing these modifications to the ibmvscsi driver.

Signed-off-by: Don Zickus <dzickus@redhat.com>

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 0270ac6..02b6288 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -70,6 +70,7 @@
 #include <linux/moduleparam.h>
 #include <linux/dma-mapping.h>
 #include <linux/delay.h>
+#include <asm/prom.h>
 #include <asm/vio.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -91,6 +92,8 @@ static int abort_timeout = 60;
 static int reset_timeout = 60;
 static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
 static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
+static int fast_fail = 1;
+static int client_reserve = 1;
 
 #define IBMVSCSI_VERSION "1.5.9"
 
@@ -107,6 +110,10 @@ module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
 module_param_named(max_requests, max_requests, int, S_IRUGO);
 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
+module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
+module_param_named(client_reserve, client_reserve, int, S_IRUGO);
+MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
 
 /* ------------------------------------------------------------
  * Routines for the event pool and event structs
@@ -424,12 +431,13 @@ static int map_sg_data(struct scsi_cmnd *cmd,
 	/* get indirect table */
 	if (!evt_struct->ext_list) {
 		evt_struct->ext_list = (struct srp_direct_buf *)
-			dma_alloc_coherent(dev, 
+			dma_alloc_coherent(dev,
 					   SG_ALL * sizeof(struct srp_direct_buf),
 					   &evt_struct->ext_list_token, 0);
 		if (!evt_struct->ext_list) {
 			sdev_printk(KERN_ERR, cmd->device,
 				    "Can't allocate memory for indirect table\n");
+			scsi_dma_unmap(cmd);
 			return 0;
 		}
 	}
@@ -813,102 +821,53 @@ static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
 /* ------------------------------------------------------------
  * Routines for driver initialization
  */
+
 /**
- * adapter_info_rsp: - Handle response to MAD adapter info request
- * @evt_struct:	srp_event_struct with the response
+ * map_persist_bufs: - Pre-map persistent data for adapter logins
+ * @hostdata:   ibmvscsi_host_data of host
  *
- * Used as a "done" callback by when sending adapter_info. Gets called
- * by ibmvscsi_handle_crq()
-*/
-static void adapter_info_rsp(struct srp_event_struct *evt_struct)
+ * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
+ * Return 1 on error, 0 on success.
+ */
+static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
 {
-	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
-	dma_unmap_single(hostdata->dev,
-			 evt_struct->iu.mad.adapter_info.buffer,
-			 evt_struct->iu.mad.adapter_info.common.length,
-			 DMA_BIDIRECTIONAL);
 
-	if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
-		dev_err(hostdata->dev, "error %d getting adapter info\n",
-			evt_struct->xfer_iu->mad.adapter_info.common.status);
-	} else {
-		dev_info(hostdata->dev, "host srp version: %s, "
-			 "host partition %s (%d), OS %d, max io %u\n",
-			 hostdata->madapter_info.srp_version,
-			 hostdata->madapter_info.partition_name,
-			 hostdata->madapter_info.partition_number,
-			 hostdata->madapter_info.os_type,
-			 hostdata->madapter_info.port_max_txu[0]);
-		
-		if (hostdata->madapter_info.port_max_txu[0]) 
-			hostdata->host->max_sectors = 
-				hostdata->madapter_info.port_max_txu[0] >> 9;
-		
-		if (hostdata->madapter_info.os_type == 3 &&
-		    strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
-			dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
-				hostdata->madapter_info.srp_version);
-			dev_err(hostdata->dev, "limiting scatterlists to %d\n",
-				MAX_INDIRECT_BUFS);
-			hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
-		}
+	hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
+					     sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
+
+	if (dma_mapping_error(hostdata->caps_addr)) {
+		dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
+		return 1;
+	}
+
+	hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
+						     &hostdata->madapter_info,
+						     sizeof(hostdata->madapter_info),
+						     DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(hostdata->adapter_info_addr)) {
+		dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
+		dma_unmap_single(hostdata->dev, hostdata->caps_addr,
+				 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
+		return 1;
 	}
+
+	return 0;
 }
 
 /**
- * send_mad_adapter_info: - Sends the mad adapter info request
- *      and stores the result so it can be retrieved with
- *      sysfs.  We COULD consider causing a failure if the
- *      returned SRP version doesn't match ours.
- * @hostdata:	ibmvscsi_host_data of host
- * 
- * Returns zero if successful.
-*/
-static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
+ * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
+ * @hostdata:   ibmvscsi_host_data of host
+ *
+ * Unmap the capabilities and adapter info DMA buffers
+ */
+static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
 {
-	struct viosrp_adapter_info *req;
-	struct srp_event_struct *evt_struct;
-	unsigned long flags;
-	dma_addr_t addr;
-
-	evt_struct = get_event_struct(&hostdata->pool);
-	if (!evt_struct) {
-		dev_err(hostdata->dev,
-			"couldn't allocate an event for ADAPTER_INFO_REQ!\n");
-		return;
-	}
+	dma_unmap_single(hostdata->dev, hostdata->caps_addr,
+			 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
 
-	init_event_struct(evt_struct,
-			  adapter_info_rsp,
-			  VIOSRP_MAD_FORMAT,
-			  info_timeout);
-	
-	req = &evt_struct->iu.mad.adapter_info;
-	memset(req, 0x00, sizeof(*req));
-	
-	req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
-	req->common.length = sizeof(hostdata->madapter_info);
-	req->buffer = addr = dma_map_single(hostdata->dev,
-					    &hostdata->madapter_info,
-					    sizeof(hostdata->madapter_info),
-					    DMA_BIDIRECTIONAL);
-
-	if (dma_mapping_error(req->buffer)) {
-		dev_err(hostdata->dev, "Unable to map request_buffer for adapter_info!\n");
-		free_event_struct(&hostdata->pool, evt_struct);
-		return;
-	}
-	
-	spin_lock_irqsave(hostdata->host->host_lock, flags);
-	if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) {
-		dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
-		dma_unmap_single(hostdata->dev,
-				 addr,
-				 sizeof(hostdata->madapter_info),
-				 DMA_BIDIRECTIONAL);
-	}
-	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
-};
+	dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
+			 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
+}
 
 /**
  * login_rsp: - Handle response to SRP login request
@@ -938,9 +897,7 @@ static void login_rsp(struct srp_event_struct *evt_struct)
 	}
 
 	dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
-
-	if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta < 0)
-		dev_err(hostdata->dev, "Invalid request_limit.\n");
+	hostdata->client_migrated = 0;
 
 	/* Now we know what the real request-limit is.
 	 * This value is set rather than added to request_limit because
@@ -951,9 +908,6 @@ static void login_rsp(struct srp_event_struct *evt_struct)
 
 	/* If we had any pending I/Os, kick them */
 	scsi_unblock_requests(hostdata->host);
-
-	send_mad_adapter_info(hostdata);
-	return;
 }
 
 /**
@@ -968,26 +922,21 @@ static int send_srp_login(struct ibmvscsi_host_data *hostdata)
 	unsigned long flags;
 	struct srp_login_req *login;
 	struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
-	if (!evt_struct) {
-		dev_err(hostdata->dev, "couldn't allocate an event for login req!\n");
-		return FAILED;
-	}
 
-	init_event_struct(evt_struct,
-			  login_rsp,
-			  VIOSRP_SRP_FORMAT,
-			  login_timeout);
+	BUG_ON(!evt_struct);
+	init_event_struct(evt_struct, login_rsp,
+			  VIOSRP_SRP_FORMAT, login_timeout);
 
 	login = &evt_struct->iu.srp.login_req;
-	memset(login, 0x00, sizeof(struct srp_login_req));
+	memset(login, 0, sizeof(*login));
 	login->opcode = SRP_LOGIN_REQ;
 	login->req_it_iu_len = sizeof(union srp_iu);
 	login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
-	
+
 	spin_lock_irqsave(hostdata->host->host_lock, flags);
 	/* Start out with a request limit of 0, since this is negotiated in
-	 * the login request we are just sending and a login request always
-	 * gets sent by the driver regardless of request_limit.
+	 * the login request we are just sending and login requests always
+	 * get sent by the driver regardless of request_limit.
 	 */
 	atomic_set(&hostdata->request_limit, 0);
 
@@ -998,6 +947,241 @@ static int send_srp_login(struct ibmvscsi_host_data *hostdata)
 };
 
 /**
+ * capabilities_rsp: - Handle response to MAD adapter capabilities request
+ * @evt_struct:	srp_event_struct with the response
+ *
+ * Used as a "done" callback by when sending adapter_info.
+ */
+static void capabilities_rsp(struct srp_event_struct *evt_struct)
+{
+	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+
+	if (evt_struct->xfer_iu->mad.capabilities.common.status) {
+		dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
+			evt_struct->xfer_iu->mad.capabilities.common.status);
+	} else {
+		if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP)
+			dev_info(hostdata->dev, "Partition migration not supported\n");
+
+		if (client_reserve) {
+			if (hostdata->caps.reserve.common.server_support ==
+			    SERVER_SUPPORTS_CAP)
+				dev_info(hostdata->dev, "Client reserve enabled\n");
+			else
+				dev_info(hostdata->dev, "Client reserve not supported\n");
+		}
+	}
+
+	send_srp_login(hostdata);
+}
+
+/**
+ * send_mad_capabilities: - Sends the mad capabilities request
+ *      and stores the result so it can be retrieved with
+ * @hostdata:	ibmvscsi_host_data of host
+ */
+static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
+{
+	struct viosrp_capabilities *req;
+	struct srp_event_struct *evt_struct;
+	unsigned long flags;
+	struct device_node *of_node = hostdata->dev->platform_data;
+	const char *location;
+
+	evt_struct = get_event_struct(&hostdata->pool);
+	BUG_ON(!evt_struct);
+
+	init_event_struct(evt_struct, capabilities_rsp,
+			  VIOSRP_MAD_FORMAT, info_timeout);
+
+	req = &evt_struct->iu.mad.capabilities;
+	memset(req, 0, sizeof(*req));
+
+	hostdata->caps.flags = CAP_LIST_SUPPORTED;
+	if (hostdata->client_migrated)
+		hostdata->caps.flags |= CLIENT_MIGRATED;
+
+	strncpy(hostdata->caps.name, hostdata->host->shost_gendev.bus_id,
+		sizeof(hostdata->caps.name));
+	hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0';
+
+	location = of_get_property(of_node, "ibm,loc-code", NULL);
+	location = location ? location : hostdata->dev->bus_id;
+	strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
+	/*snprintf(hostdata->caps.loc, sizeof(hostdata->caps.loc), "%x",
+		(to_vio_dev(hostdata->dev))->unit_address);*/
+	hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0';
+
+	req->common.type = VIOSRP_CAPABILITIES_TYPE;
+	req->buffer = hostdata->caps_addr;
+
+	hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES;
+	hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration);
+	hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP;
+	hostdata->caps.migration.ecl = 1;
+
+	if (client_reserve) {
+		hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES;
+		hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve);
+		hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP;
+		hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2;
+		req->common.length = sizeof(hostdata->caps);
+	} else
+		req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve);
+
+	spin_lock_irqsave(hostdata->host->host_lock, flags);
+	if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
+		dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
+	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+};
+
+/**
+ * fast_fail_rsp: - Handle response to MAD enable fast fail
+ * @evt_struct:	srp_event_struct with the response
+ *
+ * Used as a "done" callback by when sending enable fast fail. Gets called
+ * by ibmvscsi_handle_crq()
+ */
+static void fast_fail_rsp(struct srp_event_struct *evt_struct)
+{
+	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+	u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status;
+
+	if (status == VIOSRP_MAD_NOT_SUPPORTED)
+		dev_err(hostdata->dev, "fast_fail not supported in server\n");
+	else if (status == VIOSRP_MAD_FAILED)
+		dev_err(hostdata->dev, "fast_fail request failed\n");
+	else if (status != VIOSRP_MAD_SUCCESS)
+		dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
+
+	send_mad_capabilities(hostdata);
+}
+
+/**
+ * enable_fast_fail - Start host initialization
+ * @hostdata:	ibmvscsi_host_data of host
+ *
+ * Returns zero if successful.
+ */
+static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
+{
+	int rc;
+	unsigned long flags;
+	struct viosrp_fast_fail *fast_fail_mad;
+	struct srp_event_struct *evt_struct;
+
+	if (!fast_fail) {
+		send_mad_capabilities(hostdata);
+		return 0;
+	}
+
+	evt_struct = get_event_struct(&hostdata->pool);
+	BUG_ON(!evt_struct);
+
+	init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
+
+	fast_fail_mad = &evt_struct->iu.mad.fast_fail;
+	memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
+	fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL;
+	fast_fail_mad->common.length = sizeof(*fast_fail_mad);
+
+	spin_lock_irqsave(hostdata->host->host_lock, flags);
+	rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
+	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+	return rc;
+}
+
+/**
+ * adapter_info_rsp: - Handle response to MAD adapter info request
+ * @evt_struct:	srp_event_struct with the response
+ *
+ * Used as a "done" callback by when sending adapter_info. Gets called
+ * by ibmvscsi_handle_crq()
+*/
+static void adapter_info_rsp(struct srp_event_struct *evt_struct)
+{
+	struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+
+	if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
+		dev_err(hostdata->dev, "error %d getting adapter info\n",
+			evt_struct->xfer_iu->mad.adapter_info.common.status);
+	} else {
+		dev_info(hostdata->dev, "host srp version: %s, "
+			 "host partition %s (%d), OS %d, max io %u\n",
+			 hostdata->madapter_info.srp_version,
+			 hostdata->madapter_info.partition_name,
+			 hostdata->madapter_info.partition_number,
+			 hostdata->madapter_info.os_type,
+			 hostdata->madapter_info.port_max_txu[0]);
+
+		if (hostdata->madapter_info.port_max_txu[0])
+			hostdata->host->max_sectors =
+				hostdata->madapter_info.port_max_txu[0] >> 9;
+
+		if (hostdata->madapter_info.os_type == 3 &&
+		    strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
+			dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
+				hostdata->madapter_info.srp_version);
+			dev_err(hostdata->dev, "limiting scatterlists to %d\n",
+				MAX_INDIRECT_BUFS);
+			hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
+		}
+
+		if (hostdata->madapter_info.os_type == 3) {
+			enable_fast_fail(hostdata);
+			return;
+		}
+	}
+
+	send_srp_login(hostdata);
+}
+
+/**
+ * send_mad_adapter_info: - Sends the mad adapter info request
+ *      and stores the result so it can be retrieved with
+ *      sysfs.  We COULD consider causing a failure if the
+ *      returned SRP version doesn't match ours.
+ * @hostdata:	ibmvscsi_host_data of host
+ *
+ * Returns zero if successful.
+*/
+static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
+{
+	struct viosrp_adapter_info *req;
+	struct srp_event_struct *evt_struct;
+	unsigned long flags;
+
+	evt_struct = get_event_struct(&hostdata->pool);
+	BUG_ON(!evt_struct);
+
+	init_event_struct(evt_struct,
+			  adapter_info_rsp,
+			  VIOSRP_MAD_FORMAT,
+			  info_timeout);
+
+	req = &evt_struct->iu.mad.adapter_info;
+	memset(req, 0x00, sizeof(*req));
+
+	req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
+	req->common.length = sizeof(hostdata->madapter_info);
+	req->buffer = hostdata->adapter_info_addr;
+
+	spin_lock_irqsave(hostdata->host->host_lock, flags);
+	if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
+		dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
+	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+};
+
+/**
+ * init_adapter: Start virtual adapter initialization sequence
+ *
+ */
+static void init_adapter(struct ibmvscsi_host_data *hostdata)
+{
+	send_mad_adapter_info(hostdata);
+}
+
+/**
  * sync_completion: Signal that a synchronous command has completed
  * Note that after returning from this call, the evt_struct is freed.
  * the caller waiting on this completion shouldn't touch the evt_struct
@@ -1032,7 +1216,7 @@ static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
 	 * out the correct tag
 	 */
 	spin_lock_irqsave(hostdata->host->host_lock, flags);
-	wait_switch = jiffies + (abort_timeout * HZ);
+	wait_switch = jiffies + (init_timeout * HZ);
 	do {
 		found_evt = NULL;
 		list_for_each_entry(tmp_evt, &hostdata->sent, list) {
@@ -1050,7 +1234,8 @@ static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
 		evt = get_event_struct(&hostdata->pool);
 		if (evt == NULL) {
 			spin_unlock_irqrestore(hostdata->host->host_lock, flags);
-			sdev_printk(KERN_ERR, cmd->device, "failed to allocate abort event\n");
+			sdev_printk(KERN_ERR, cmd->device,
+				"failed to allocate abort event\n");
 			return FAILED;
 		}
 	
@@ -1168,7 +1353,7 @@ static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
 	unsigned long wait_switch = 0;
 
 	spin_lock_irqsave(hostdata->host->host_lock, flags);
-	wait_switch = jiffies + (reset_timeout * HZ);
+	wait_switch = jiffies + (init_timeout * HZ);
 	do {
 		evt = get_event_struct(&hostdata->pool);
 		if (evt == NULL) {
@@ -1276,7 +1461,7 @@ static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
 
 	ibmvscsi_reset_host(hostdata);
 
-	for (wait_switch = jiffies + (reset_timeout * HZ);
+	for (wait_switch = jiffies + (init_timeout * HZ);
 	     time_before(jiffies, wait_switch) &&
 		     atomic_read(&hostdata->request_limit) < 2;) {
 
@@ -1311,7 +1496,7 @@ void ibmvscsi_handle_crq(struct viosrp_crq *crq,
 			if ((rc = ibmvscsi_send_crq(hostdata,
 						    0xC002000000000000LL, 0)) == 0) {
 				/* Now login */
-				send_srp_login(hostdata);
+				init_adapter(hostdata);
 			} else {
 				dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
 			}
@@ -1321,7 +1506,7 @@ void ibmvscsi_handle_crq(struct viosrp_crq *crq,
 			dev_info(hostdata->dev, "partner initialization complete\n");
 
 			/* Now login */
-			send_srp_login(hostdata);
+			init_adapter(hostdata);
 			break;
 		default:
 			dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
@@ -1333,6 +1518,7 @@ void ibmvscsi_handle_crq(struct viosrp_crq *crq,
 		if (crq->format == 0x06) {
 			/* We need to re-setup the interpartition connection */
 			dev_info(hostdata->dev, "Re-enabling adapter!\n");
+			hostdata->client_migrated = 1;
 			purge_requests(hostdata, DID_REQUEUE);
 			if ((ibmvscsi_reenable_crq_queue(&hostdata->queue,
 							hostdata)) ||
@@ -1470,7 +1656,7 @@ static int ibmvscsi_slave_configure(struct scsi_device *sdev)
 	unsigned long lock_flags = 0;
 
 	spin_lock_irqsave(shost->host_lock, lock_flags);
-	if(sdev->type == TYPE_DISK) {
+	if (sdev->type == TYPE_DISK) {
 		sdev->allow_restart = 1;
 		sdev->timeout = 120 * HZ;
 	}
@@ -1499,6 +1685,46 @@ static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
 /* ------------------------------------------------------------
  * sysfs attributes
  */
+static ssize_t show_host_vhost_loc(struct class_device *class_dev,
+				   char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(class_dev);
+	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
+	int len;
+
+	len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
+		       hostdata->caps.loc);
+	return len;
+}
+
+static struct class_device_attribute ibmvscsi_host_vhost_loc = {
+	.attr = {
+		.name = "vhost_loc",
+		.mode = S_IRUGO,
+		},
+	.show = show_host_vhost_loc,
+};
+
+static ssize_t show_host_vhost_name(struct class_device *class_dev,
+				    char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(class_dev);
+	struct ibmvscsi_host_data *hostdata = shost_priv(shost);
+	int len;
+
+	len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
+		       hostdata->caps.name);
+	return len;
+}
+
+static struct class_device_attribute ibmvscsi_host_vhost_name = {
+	.attr = {
+		.name = "vhost_name",
+		.mode = S_IRUGO,
+		},
+	.show = show_host_vhost_name,
+};
+
 static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf)
 {
 	struct Scsi_Host *shost = class_to_shost(class_dev);
@@ -1616,6 +1842,8 @@ static struct class_device_attribute ibmvscsi_host_config = {
 };
 
 static struct class_device_attribute *ibmvscsi_attrs[] = {
+	&ibmvscsi_host_vhost_loc,
+	&ibmvscsi_host_vhost_name,
 	&ibmvscsi_host_srp_version,
 	&ibmvscsi_host_partition_name,
 	&ibmvscsi_host_partition_number,
@@ -1673,6 +1901,11 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	atomic_set(&hostdata->request_limit, -1);
 	hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
 
+	if (map_persist_bufs(hostdata)) {
+		dev_err(&vdev->dev, "couldn't map persistent buffers\n");
+		goto persist_bufs_failed;
+	}
+
 	rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
 	if (rc != 0 && rc != H_RESOURCE) {
 		dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
@@ -1723,6 +1956,8 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
       init_pool_failed:
 	ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
       init_crq_failed:
+	unmap_persist_bufs(hostdata);
+      persist_bufs_failed:
 	scsi_host_put(host);
       scsi_host_alloc_failed:
 	return -1;
@@ -1731,6 +1966,7 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 static int ibmvscsi_remove(struct vio_dev *vdev)
 {
 	struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data;
+	unmap_persist_bufs(hostdata);
 	release_event_pool(&hostdata->pool, hostdata);
 	ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
 				   max_events);
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h
index b19c2e2..f445c3b 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.h
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.h
@@ -88,6 +88,7 @@ struct event_pool {
 /* all driver data associated with a host adapter */
 struct ibmvscsi_host_data {
 	atomic_t request_limit;
+	int client_migrated;
 	struct device *dev;
 	struct event_pool pool;
 	struct crq_queue queue;
@@ -95,6 +96,9 @@ struct ibmvscsi_host_data {
 	struct list_head sent;
 	struct Scsi_Host *host;
 	struct mad_adapter_info_data madapter_info;
+	struct capabilities caps;
+	dma_addr_t caps_addr;
+	dma_addr_t adapter_info_addr;
 };
 
 /* routines for managing a command/response queue */
diff --git a/drivers/scsi/ibmvscsi/viosrp.h b/drivers/scsi/ibmvscsi/viosrp.h
index d199389..2cd735d 100644
--- a/drivers/scsi/ibmvscsi/viosrp.h
+++ b/drivers/scsi/ibmvscsi/viosrp.h
@@ -37,6 +37,7 @@
 
 #define SRP_VERSION "16.a"
 #define SRP_MAX_IU_LEN	256
+#define SRP_MAX_LOC_LEN 32
 
 union srp_iu {
 	struct srp_login_req login_req;
@@ -64,7 +65,7 @@ enum viosrp_crq_status {
 	VIOSRP_NONRECOVERABLE_ERR = 0x1,
 	VIOSRP_VIOLATES_MAX_XFER = 0x2,
 	VIOSRP_PARTNER_PANIC = 0x3,
-	VIOSRP_DEVICE_BUSY = 0x4,
+	VIOSRP_DEVICE_BUSY = 0x8,
 	VIOSRP_ADAPTER_FAIL = 0x10,
 	VIOSRP_OK2 = 0x99,
 };
@@ -86,7 +87,37 @@ enum viosrp_mad_types {
 	VIOSRP_EMPTY_IU_TYPE = 0x01,
 	VIOSRP_ERROR_LOG_TYPE = 0x02,
 	VIOSRP_ADAPTER_INFO_TYPE = 0x03,
-	VIOSRP_HOST_CONFIG_TYPE = 0x04
+	VIOSRP_HOST_CONFIG_TYPE = 0x04,
+	VIOSRP_CAPABILITIES_TYPE = 0x05,
+	VIOSRP_ENABLE_FAST_FAIL = 0x08,
+};
+
+enum viosrp_mad_status {
+	VIOSRP_MAD_SUCCESS = 0x00,
+	VIOSRP_MAD_NOT_SUPPORTED = 0xF1,
+	VIOSRP_MAD_FAILED = 0xF7,
+};
+
+enum viosrp_capability_type {
+	MIGRATION_CAPABILITIES = 0x01,
+	RESERVATION_CAPABILITIES = 0x02,
+};
+
+enum viosrp_capability_support {
+	SERVER_DOES_NOT_SUPPORTS_CAP = 0x0,
+	SERVER_SUPPORTS_CAP = 0x01,
+	SERVER_CAP_DATA = 0x02,
+};
+
+enum viosrp_reserve_type {
+	CLIENT_RESERVE_SCSI_2 = 0x01,
+};
+
+enum viosrp_capability_flag {
+	CLIENT_MIGRATED = 0x01,
+	CLIENT_RECONNECT = 0x02,
+	CAP_LIST_SUPPORTED = 0x04,
+	CAP_LIST_DATA = 0x08,
 };
 
 /* 
@@ -127,11 +158,46 @@ struct viosrp_host_config {
 	u64 buffer;
 };
 
+struct viosrp_fast_fail {
+	struct mad_common common;
+};
+
+struct viosrp_capabilities {
+	struct mad_common common;
+	u64 buffer;
+};
+
+struct mad_capability_common {
+	u32 cap_type;
+	u16 length;
+	u16 server_support;
+};
+
+struct mad_reserve_cap {
+	struct mad_capability_common common;
+	u32 type;
+};
+
+struct mad_migration_cap {
+	struct mad_capability_common common;
+	u32 ecl;
+};
+
+struct capabilities{
+	u32 flags;
+	char name[SRP_MAX_LOC_LEN];
+	char loc[SRP_MAX_LOC_LEN];
+	struct mad_migration_cap migration;
+	struct mad_reserve_cap reserve;
+};
+
 union mad_iu {
 	struct viosrp_empty_iu empty_iu;
 	struct viosrp_error_log error_log;
 	struct viosrp_adapter_info adapter_info;
 	struct viosrp_host_config host_config;
+	struct viosrp_fast_fail fast_fail;
+	struct viosrp_capabilities capabilities;
 };
 
 union viosrp_iu {