Linux-2.6.12-rc2v2.6.12-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, 949 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
new file mode 100644
index 000000000000..e21b547fd427
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -0,0 +1,949 @@
+/* 
+ * 
+ * linux/drivers/s390/scsi/zfcp_scsi.c
+ * 
+ * FCP adapter driver for IBM eServer zSeries 
+ * 
+ * (C) Copyright IBM Corp. 2002, 2004
+ *
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com> 
+ *            Raimund Schroeder <raimund.schroeder@de.ibm.com> 
+ *            Aron Zeh
+ *            Wolfgang Taphorn
+ *            Stefan Bader <stefan.bader@de.ibm.com> 
+ *            Heiko Carstens <heiko.carstens@de.ibm.com> 
+ *            Andreas Herrmann <aherrman@de.ibm.com>
+ * 
+ * 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; either version 2, or (at your option) 
+ * any later version. 
+ * 
+ * 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. 
+ * 
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA. 
+ */
+
+#define ZFCP_LOG_AREA			ZFCP_LOG_AREA_SCSI
+
+#define ZFCP_SCSI_REVISION "$Revision: 1.74 $"
+
+#include "zfcp_ext.h"
+
+static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
+static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
+static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
+static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
+				  void (*done) (struct scsi_cmnd *));
+static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
+static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
+static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
+static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
+static int zfcp_task_management_function(struct zfcp_unit *, u8);
+
+static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t,
+					  scsi_lun_t);
+static struct zfcp_port *zfcp_port_lookup(struct zfcp_adapter *, int,
+					  scsi_id_t);
+
+static struct device_attribute *zfcp_sysfs_sdev_attrs[];
+
+struct scsi_transport_template *zfcp_transport_template;
+
+struct zfcp_data zfcp_data = {
+	.scsi_host_template = {
+	      name:	               ZFCP_NAME,
+	      proc_name:               "zfcp",
+	      proc_info:               NULL,
+	      detect:	               NULL,
+	      slave_alloc:             zfcp_scsi_slave_alloc,
+	      slave_configure:         zfcp_scsi_slave_configure,
+	      slave_destroy:           zfcp_scsi_slave_destroy,
+	      queuecommand:            zfcp_scsi_queuecommand,
+	      eh_abort_handler:        zfcp_scsi_eh_abort_handler,
+	      eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
+	      eh_bus_reset_handler:    zfcp_scsi_eh_bus_reset_handler,
+	      eh_host_reset_handler:   zfcp_scsi_eh_host_reset_handler,
+			               /* FIXME(openfcp): Tune */
+	      can_queue:               4096,
+	      this_id:	               0,
+	      /*
+	       * FIXME:
+	       * one less? can zfcp_create_sbale cope with it?
+	       */
+	      sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
+	      cmd_per_lun:             1,
+	      unchecked_isa_dma:       0,
+	      use_clustering:          1,
+	      sdev_attrs:              zfcp_sysfs_sdev_attrs,
+	},
+	.driver_version = ZFCP_VERSION,
+	/* rest initialised with zeros */
+};
+
+/* Find start of Response Information in FCP response unit*/
+char *
+zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
+{
+	char *fcp_rsp_info_ptr;
+
+	fcp_rsp_info_ptr =
+	    (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
+
+	return fcp_rsp_info_ptr;
+}
+
+/* Find start of Sense Information in FCP response unit*/
+char *
+zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
+{
+	char *fcp_sns_info_ptr;
+
+	fcp_sns_info_ptr =
+	    (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
+	if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
+		fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
+		    fcp_rsp_iu->fcp_rsp_len;
+
+	return fcp_sns_info_ptr;
+}
+
+fcp_dl_t *
+zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
+{
+	int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
+	fcp_dl_t *fcp_dl_addr;
+
+	fcp_dl_addr = (fcp_dl_t *)
+		((unsigned char *) fcp_cmd +
+		 sizeof (struct fcp_cmnd_iu) + additional_length);
+	/*
+	 * fcp_dl_addr = start address of fcp_cmnd structure + 
+	 * size of fixed part + size of dynamically sized add_dcp_cdb field
+	 * SEE FCP-2 documentation
+	 */
+	return fcp_dl_addr;
+}
+
+fcp_dl_t
+zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
+{
+	return *zfcp_get_fcp_dl_ptr(fcp_cmd);
+}
+
+void
+zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
+{
+	*zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
+}
+
+/*
+ * note: it's a bit-or operation not an assignment
+ * regarding the specified byte
+ */
+static inline void
+set_byte(u32 * result, char status, char pos)
+{
+	*result |= status << (pos * 8);
+}
+
+void
+set_host_byte(u32 * result, char status)
+{
+	set_byte(result, status, 2);
+}
+
+void
+set_driver_byte(u32 * result, char status)
+{
+	set_byte(result, status, 3);
+}
+
+/*
+ * function:	zfcp_scsi_slave_alloc
+ *
+ * purpose:
+ *
+ * returns:
+ */
+
+static int
+zfcp_scsi_slave_alloc(struct scsi_device *sdp)
+{
+	struct zfcp_adapter *adapter;
+	struct zfcp_unit *unit;
+	unsigned long flags;
+	int retval = -ENODEV;
+
+	adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
+	if (!adapter)
+		goto out;
+
+	read_lock_irqsave(&zfcp_data.config_lock, flags);
+	unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
+	if (unit) {
+		sdp->hostdata = unit;
+		unit->device = sdp;
+		zfcp_unit_get(unit);
+		retval = 0;
+	}
+	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
+ out:
+	return retval;
+}
+
+/*
+ * function:	zfcp_scsi_slave_destroy
+ *
+ * purpose:
+ *
+ * returns:
+ */
+
+static void
+zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
+{
+	struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
+
+	if (unit) {
+		sdpnt->hostdata = NULL;
+		unit->device = NULL;
+		zfcp_unit_put(unit);
+	} else {
+		ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
+				"address %p\n", sdpnt);
+	}
+}
+
+/* 
+ * called from scsi midlayer to allow finetuning of a device.
+ */
+static int
+zfcp_scsi_slave_configure(struct scsi_device *sdp)
+{
+	if (sdp->tagged_supported)
+		scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
+	else
+		scsi_adjust_queue_depth(sdp, 0, 1);
+	return 0;
+}
+
+/**
+ * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
+ * @scpnt: pointer to struct scsi_cmnd where result is set
+ * @result: result to be set in scpnt (e.g. DID_ERROR)
+ */
+static void
+zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
+{
+	set_host_byte(&scpnt->result, result);
+	zfcp_cmd_dbf_event_scsi("failing", scpnt);
+	/* return directly */
+	scpnt->scsi_done(scpnt);
+}
+
+/**
+ * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
+ *	zfcp_scsi_command_sync
+ * @adapter: adapter where scsi command is issued
+ * @unit: unit to which scsi command is sent
+ * @scpnt: scsi command to be sent
+ * @timer: timer to be started if request is successfully initiated
+ *
+ * Note: In scsi_done function must be set in scpnt.
+ */
+int
+zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
+			struct scsi_cmnd *scpnt, struct timer_list *timer)
+{
+	int tmp;
+	int retval;
+
+	retval = 0;
+
+	BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
+	BUG_ON(scpnt->scsi_done == NULL);
+
+	if (unlikely(NULL == unit)) {
+		zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
+		goto out;
+	}
+
+	if (unlikely(
+	      atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
+	     !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
+		ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
+			       "0x%016Lx on adapter %s\n",
+			       unit->fcp_lun, unit->port->wwpn,
+			       zfcp_get_busid_by_adapter(adapter));
+		zfcp_scsi_command_fail(scpnt, DID_ERROR);
+		goto out;
+	}
+
+	if (unlikely(
+	     !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
+		ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
+			       "on port 0x%016Lx in recovery\n",
+			       zfcp_get_busid_by_unit(unit),
+			       unit->fcp_lun, unit->port->wwpn);
+		retval = SCSI_MLQUEUE_DEVICE_BUSY;
+		goto out;
+	}
+
+	tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
+					     ZFCP_REQ_AUTO_CLEANUP);
+
+	if (unlikely(tmp < 0)) {
+		ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
+		retval = SCSI_MLQUEUE_HOST_BUSY;
+	}
+
+out:
+	return retval;
+}
+
+void
+zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
+{
+	struct completion *wait = (struct completion *) scpnt->SCp.ptr;
+	complete(wait);
+}
+
+
+/**
+ * zfcp_scsi_command_sync - send a SCSI command and wait for completion
+ * @unit: unit where command is sent to
+ * @scpnt: scsi command to be sent
+ * @timer: timer to be started if request is successfully initiated
+ * Return: 0
+ *
+ * Errors are indicated in scpnt->result
+ */
+int
+zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
+		       struct timer_list *timer)
+{
+	int ret;
+	DECLARE_COMPLETION(wait);
+
+	scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
+	scpnt->scsi_done = zfcp_scsi_command_sync_handler;
+	ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
+	if (ret == 0)
+		wait_for_completion(&wait);
+
+	scpnt->SCp.ptr = NULL;
+
+	return 0;
+}
+
+/*
+ * function:	zfcp_scsi_queuecommand
+ *
+ * purpose:	enqueues a SCSI command to the specified target device
+ *
+ * returns:	0 - success, SCSI command enqueued
+ *		!0 - failure
+ */
+int
+zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
+		       void (*done) (struct scsi_cmnd *))
+{
+	struct zfcp_unit *unit;
+	struct zfcp_adapter *adapter;
+
+	/* reset the status for this request */
+	scpnt->result = 0;
+	scpnt->host_scribble = NULL;
+	scpnt->scsi_done = done;
+
+	/*
+	 * figure out adapter and target device
+	 * (stored there by zfcp_scsi_slave_alloc)
+	 */
+	adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
+	unit = (struct zfcp_unit *) scpnt->device->hostdata;
+
+	return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
+}
+
+/*
+ * function:    zfcp_unit_lookup
+ *
+ * purpose:
+ *
+ * returns:
+ *
+ * context:	
+ */
+static struct zfcp_unit *
+zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
+		 scsi_lun_t lun)
+{
+	struct zfcp_port *port;
+	struct zfcp_unit *unit, *retval = NULL;
+
+	list_for_each_entry(port, &adapter->port_list_head, list) {
+		if (id != port->scsi_id)
+			continue;
+		list_for_each_entry(unit, &port->unit_list_head, list) {
+			if (lun == unit->scsi_lun) {
+				retval = unit;
+				goto out;
+			}
+		}
+	}
+ out:
+	return retval;
+}
+
+static struct zfcp_port *
+zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id)
+{
+	struct zfcp_port *port;
+
+	list_for_each_entry(port, &adapter->port_list_head, list) {
+		if (id == port->scsi_id)
+			return port;
+	}
+	return (struct zfcp_port *) NULL;
+}
+
+/*
+ * function:	zfcp_scsi_eh_abort_handler
+ *
+ * purpose:	tries to abort the specified (timed out) SCSI command
+ *
+ * note: 	We do not need to care for a SCSI command which completes
+ *		normally but late during this abort routine runs.
+ *		We are allowed to return late commands to the SCSI stack.
+ *		It tracks the state of commands and will handle late commands.
+ *		(Usually, the normal completion of late commands is ignored with
+ *		respect to the running abort operation. Grep for 'done_late'
+ *		in the SCSI stacks sources.)
+ *
+ * returns:	SUCCESS	- command has been aborted and cleaned up in internal
+ *			  bookkeeping,
+ *			  SCSI stack won't be called for aborted command
+ *		FAILED	- otherwise
+ */
+int
+zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
+{
+	int retval = SUCCESS;
+	struct zfcp_fsf_req *new_fsf_req, *old_fsf_req;
+	struct zfcp_adapter *adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
+	struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
+	struct zfcp_port *port = unit->port;
+	struct Scsi_Host *scsi_host = scpnt->device->host;
+	union zfcp_req_data *req_data = NULL;
+	unsigned long flags;
+	u32 status = 0;
+
+	/* the components of a abort_dbf record (fixed size record) */
+	u64 dbf_scsi_cmnd = (unsigned long) scpnt;
+	char dbf_opcode[ZFCP_ABORT_DBF_LENGTH];
+	wwn_t dbf_wwn = port->wwpn;
+	fcp_lun_t dbf_fcp_lun = unit->fcp_lun;
+	u64 dbf_retries = scpnt->retries;
+	u64 dbf_allowed = scpnt->allowed;
+	u64 dbf_timeout = 0;
+	u64 dbf_fsf_req = 0;
+	u64 dbf_fsf_status = 0;
+	u64 dbf_fsf_qual[2] = { 0, 0 };
+	char dbf_result[ZFCP_ABORT_DBF_LENGTH] = "##undef";
+
+	memset(dbf_opcode, 0, ZFCP_ABORT_DBF_LENGTH);
+	memcpy(dbf_opcode,
+	       scpnt->cmnd,
+	       min(scpnt->cmd_len, (unsigned char) ZFCP_ABORT_DBF_LENGTH));
+
+	ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
+		      scpnt, zfcp_get_busid_by_adapter(adapter));
+
+	spin_unlock_irq(scsi_host->host_lock);
+
+	/*
+	 * Race condition between normal (late) completion and abort has
+	 * to be avoided.
+	 * The entirity of all accesses to scsi_req have to be atomic.
+	 * scsi_req is usually part of the fsf_req and thus we block the
+	 * release of fsf_req as long as we need to access scsi_req.
+	 */
+	write_lock_irqsave(&adapter->abort_lock, flags);
+
+	/*
+	 * Check whether command has just completed and can not be aborted.
+	 * Even if the command has just been completed late, we can access
+	 * scpnt since the SCSI stack does not release it at least until
+	 * this routine returns. (scpnt is parameter passed to this routine
+	 * and must not disappear during abort even on late completion.)
+	 */
+	req_data = (union zfcp_req_data *) scpnt->host_scribble;
+	/* DEBUG */
+	ZFCP_LOG_DEBUG("req_data=%p\n", req_data);
+	if (!req_data) {
+		ZFCP_LOG_DEBUG("late command completion overtook abort\n");
+		/*
+		 * That's it.
+		 * Do not initiate abort but return SUCCESS.
+		 */
+		write_unlock_irqrestore(&adapter->abort_lock, flags);
+		retval = SUCCESS;
+		strncpy(dbf_result, "##late1", ZFCP_ABORT_DBF_LENGTH);
+		goto out;
+	}
+
+	/* Figure out which fsf_req needs to be aborted. */
+	old_fsf_req = req_data->send_fcp_command_task.fsf_req;
+
+	dbf_fsf_req = (unsigned long) old_fsf_req;
+	dbf_timeout =
+	    (jiffies - req_data->send_fcp_command_task.start_jiffies) / HZ;
+
+	ZFCP_LOG_DEBUG("old_fsf_req=%p\n", old_fsf_req);
+	if (!old_fsf_req) {
+		write_unlock_irqrestore(&adapter->abort_lock, flags);
+		ZFCP_LOG_NORMAL("bug: no old fsf request found\n");
+		ZFCP_LOG_NORMAL("req_data:\n");
+		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
+			      (char *) req_data, sizeof (union zfcp_req_data));
+		ZFCP_LOG_NORMAL("scsi_cmnd:\n");
+		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
+			      (char *) scpnt, sizeof (struct scsi_cmnd));
+		retval = FAILED;
+		strncpy(dbf_result, "##bug:r", ZFCP_ABORT_DBF_LENGTH);
+		goto out;
+	}
+	old_fsf_req->data.send_fcp_command_task.scsi_cmnd = NULL;
+	/* mark old request as being aborted */
+	old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
+	/*
+	 * We have to collect all information (e.g. unit) needed by 
+	 * zfcp_fsf_abort_fcp_command before calling that routine
+	 * since that routine is not allowed to access
+	 * fsf_req which it is going to abort.
+	 * This is because of we need to release fsf_req_list_lock
+	 * before calling zfcp_fsf_abort_fcp_command.
+	 * Since this lock will not be held, fsf_req may complete
+	 * late and may be released meanwhile.
+	 */
+	ZFCP_LOG_DEBUG("unit 0x%016Lx (%p)\n", unit->fcp_lun, unit);
+
+	/*
+	 * We block (call schedule)
+	 * That's why we must release the lock and enable the
+	 * interrupts before.
+	 * On the other hand we do not need the lock anymore since
+	 * all critical accesses to scsi_req are done.
+	 */
+	write_unlock_irqrestore(&adapter->abort_lock, flags);
+	/* call FSF routine which does the abort */
+	new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
+						 adapter, unit, 0);
+	ZFCP_LOG_DEBUG("new_fsf_req=%p\n", new_fsf_req);
+	if (!new_fsf_req) {
+		retval = FAILED;
+		ZFCP_LOG_NORMAL("error: initiation of Abort FCP Cmnd "
+				"failed\n");
+		strncpy(dbf_result, "##nores", ZFCP_ABORT_DBF_LENGTH);
+		goto out;
+	}
+
+	/* wait for completion of abort */
+	ZFCP_LOG_DEBUG("waiting for cleanup...\n");
+#if 1
+	/*
+	 * FIXME:
+	 * copying zfcp_fsf_req_wait_and_cleanup code is not really nice
+	 */
+	__wait_event(new_fsf_req->completion_wq,
+		     new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
+	status = new_fsf_req->status;
+	dbf_fsf_status = new_fsf_req->qtcb->header.fsf_status;
+	/*
+	 * Ralphs special debug load provides timestamps in the FSF
+	 * status qualifier. This might be specified later if being
+	 * useful for debugging aborts.
+	 */
+	dbf_fsf_qual[0] =
+	    *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[0];
+	dbf_fsf_qual[1] =
+	    *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[2];
+	zfcp_fsf_req_cleanup(new_fsf_req);
+#else
+	retval = zfcp_fsf_req_wait_and_cleanup(new_fsf_req,
+					       ZFCP_UNINTERRUPTIBLE, &status);
+#endif
+	ZFCP_LOG_DEBUG("Waiting for cleanup complete, status=0x%x\n", status);
+	/* status should be valid since signals were not permitted */
+	if (status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
+		retval = SUCCESS;
+		strncpy(dbf_result, "##succ", ZFCP_ABORT_DBF_LENGTH);
+	} else if (status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
+		retval = SUCCESS;
+		strncpy(dbf_result, "##late2", ZFCP_ABORT_DBF_LENGTH);
+	} else {
+		retval = FAILED;
+		strncpy(dbf_result, "##fail", ZFCP_ABORT_DBF_LENGTH);
+	}
+
+ out:
+	debug_event(adapter->abort_dbf, 1, &dbf_scsi_cmnd, sizeof (u64));
+	debug_event(adapter->abort_dbf, 1, &dbf_opcode, ZFCP_ABORT_DBF_LENGTH);
+	debug_event(adapter->abort_dbf, 1, &dbf_wwn, sizeof (wwn_t));
+	debug_event(adapter->abort_dbf, 1, &dbf_fcp_lun, sizeof (fcp_lun_t));
+	debug_event(adapter->abort_dbf, 1, &dbf_retries, sizeof (u64));
+	debug_event(adapter->abort_dbf, 1, &dbf_allowed, sizeof (u64));
+	debug_event(adapter->abort_dbf, 1, &dbf_timeout, sizeof (u64));
+	debug_event(adapter->abort_dbf, 1, &dbf_fsf_req, sizeof (u64));
+	debug_event(adapter->abort_dbf, 1, &dbf_fsf_status, sizeof (u64));
+	debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[0], sizeof (u64));
+	debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[1], sizeof (u64));
+	debug_text_event(adapter->abort_dbf, 1, dbf_result);
+
+	spin_lock_irq(scsi_host->host_lock);
+	return retval;
+}
+
+/*
+ * function:	zfcp_scsi_eh_device_reset_handler
+ *
+ * purpose:
+ *
+ * returns:
+ */
+int
+zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
+{
+	int retval;
+	struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
+	struct Scsi_Host *scsi_host = scpnt->device->host;
+
+	spin_unlock_irq(scsi_host->host_lock);
+
+	if (!unit) {
+		ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
+		retval = SUCCESS;
+		goto out;
+	}
+	ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
+
+	/*
+	 * If we do not know whether the unit supports 'logical unit reset'
+	 * then try 'logical unit reset' and proceed with 'target reset'
+	 * if 'logical unit reset' fails.
+	 * If the unit is known not to support 'logical unit reset' then
+	 * skip 'logical unit reset' and try 'target reset' immediately.
+	 */
+	if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
+			      &unit->status)) {
+		retval =
+		    zfcp_task_management_function(unit, FCP_LOGICAL_UNIT_RESET);
+		if (retval) {
+			ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
+			if (retval == -ENOTSUPP)
+				atomic_set_mask
+				    (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
+				     &unit->status);
+			/* fall through and try 'target reset' next */
+		} else {
+			ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
+				       unit);
+			/* avoid 'target reset' */
+			retval = SUCCESS;
+			goto out;
+		}
+	}
+	retval = zfcp_task_management_function(unit, FCP_TARGET_RESET);
+	if (retval) {
+		ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
+		retval = FAILED;
+	} else {
+		ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
+		retval = SUCCESS;
+	}
+ out:
+	spin_lock_irq(scsi_host->host_lock);
+	return retval;
+}
+
+static int
+zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags)
+{
+	struct zfcp_adapter *adapter = unit->port->adapter;
+	int retval;
+	int status;
+	struct zfcp_fsf_req *fsf_req;
+
+	/* issue task management function */
+	fsf_req = zfcp_fsf_send_fcp_command_task_management
+		(adapter, unit, tm_flags, 0);
+	if (!fsf_req) {
+		ZFCP_LOG_INFO("error: creation of task management request "
+			      "failed for unit 0x%016Lx on port 0x%016Lx on  "
+			      "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
+			      zfcp_get_busid_by_adapter(adapter));
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	retval = zfcp_fsf_req_wait_and_cleanup(fsf_req,
+					       ZFCP_UNINTERRUPTIBLE, &status);
+	/*
+	 * check completion status of task management function
+	 * (status should always be valid since no signals permitted)
+	 */
+	if (status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED)
+		retval = -EIO;
+	else if (status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP)
+		retval = -ENOTSUPP;
+	else
+		retval = 0;
+ out:
+	return retval;
+}
+
+/*
+ * function:	zfcp_scsi_eh_bus_reset_handler
+ *
+ * purpose:
+ *
+ * returns:
+ */
+int
+zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
+{
+	int retval = 0;
+	struct zfcp_unit *unit;
+	struct Scsi_Host *scsi_host = scpnt->device->host;
+
+	spin_unlock_irq(scsi_host->host_lock);
+
+	unit = (struct zfcp_unit *) scpnt->device->hostdata;
+	ZFCP_LOG_NORMAL("bus reset because of problems with "
+			"unit 0x%016Lx\n", unit->fcp_lun);
+	zfcp_erp_adapter_reopen(unit->port->adapter, 0);
+	zfcp_erp_wait(unit->port->adapter);
+	retval = SUCCESS;
+
+	spin_lock_irq(scsi_host->host_lock);
+	return retval;
+}
+
+/*
+ * function:	zfcp_scsi_eh_host_reset_handler
+ *
+ * purpose:
+ *
+ * returns:
+ */
+int
+zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
+{
+	int retval = 0;
+	struct zfcp_unit *unit;
+	struct Scsi_Host *scsi_host = scpnt->device->host;
+
+	spin_unlock_irq(scsi_host->host_lock);
+
+	unit = (struct zfcp_unit *) scpnt->device->hostdata;
+	ZFCP_LOG_NORMAL("host reset because of problems with "
+			"unit 0x%016Lx\n", unit->fcp_lun);
+	zfcp_erp_adapter_reopen(unit->port->adapter, 0);
+	zfcp_erp_wait(unit->port->adapter);
+	retval = SUCCESS;
+
+	spin_lock_irq(scsi_host->host_lock);
+	return retval;
+}
+
+/*
+ * function:	
+ *
+ * purpose:	
+ *
+ * returns:
+ */
+int
+zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
+{
+	int retval = 0;
+	static unsigned int unique_id = 0;
+
+	/* register adapter as SCSI host with mid layer of SCSI stack */
+	adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
+					     sizeof (struct zfcp_adapter *));
+	if (!adapter->scsi_host) {
+		ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
+				"for adapter %s ",
+				zfcp_get_busid_by_adapter(adapter));
+		retval = -EIO;
+		goto out;
+	}
+	ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
+
+	/* tell the SCSI stack some characteristics of this adapter */
+	adapter->scsi_host->max_id = 1;
+	adapter->scsi_host->max_lun = 1;
+	adapter->scsi_host->max_channel = 0;
+	adapter->scsi_host->unique_id = unique_id++;	/* FIXME */
+	adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
+	adapter->scsi_host->transportt = zfcp_transport_template;
+	/*
+	 * Reverse mapping of the host number to avoid race condition
+	 */
+	adapter->scsi_host_no = adapter->scsi_host->host_no;
+
+	/*
+	 * save a pointer to our own adapter data structure within
+	 * hostdata field of SCSI host data structure
+	 */
+	adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
+
+	if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
+		scsi_host_put(adapter->scsi_host);
+		retval = -EIO;
+		goto out;
+	}
+	atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
+ out:
+	return retval;
+}
+
+/*
+ * function:	
+ *
+ * purpose:	
+ *
+ * returns:
+ */
+void
+zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
+{
+	struct Scsi_Host *shost;
+
+	shost = adapter->scsi_host;
+	if (!shost)
+		return;
+	scsi_remove_host(shost);
+	scsi_host_put(shost);
+	adapter->scsi_host = NULL;
+	adapter->scsi_host_no = 0;
+	atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
+
+	return;
+}
+
+
+void
+zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
+{
+	adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
+	adapter->scsi_er_timer.data = (unsigned long) adapter;
+	adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
+	add_timer(&adapter->scsi_er_timer);
+}
+
+/*
+ * Support functions for FC transport class
+ */
+static void
+zfcp_get_port_id(struct scsi_target *starget)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
+	struct zfcp_port *port;
+	unsigned long flags;
+
+	read_lock_irqsave(&zfcp_data.config_lock, flags);
+	port = zfcp_port_lookup(adapter, starget->channel, starget->id);
+	if (port)
+		fc_starget_port_id(starget) = port->d_id;
+	else
+		fc_starget_port_id(starget) = -1;
+	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
+}
+
+static void
+zfcp_get_port_name(struct scsi_target *starget)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
+	struct zfcp_port *port;
+	unsigned long flags;
+
+	read_lock_irqsave(&zfcp_data.config_lock, flags);
+	port = zfcp_port_lookup(adapter, starget->channel, starget->id);
+	if (port)
+		fc_starget_port_name(starget) = port->wwpn;
+	else
+		fc_starget_port_name(starget) = -1;
+	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
+}
+
+static void
+zfcp_get_node_name(struct scsi_target *starget)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
+	struct zfcp_port *port;
+	unsigned long flags;
+
+	read_lock_irqsave(&zfcp_data.config_lock, flags);
+	port = zfcp_port_lookup(adapter, starget->channel, starget->id);
+	if (port)
+		fc_starget_node_name(starget) = port->wwnn;
+	else
+		fc_starget_node_name(starget) = -1;
+	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
+}
+
+struct fc_function_template zfcp_transport_functions = {
+	.get_starget_port_id = zfcp_get_port_id,
+	.get_starget_port_name = zfcp_get_port_name,
+	.get_starget_node_name = zfcp_get_node_name,
+	.show_starget_port_id = 1,
+	.show_starget_port_name = 1,
+	.show_starget_node_name = 1,
+};
+
+/**
+ * ZFCP_DEFINE_SCSI_ATTR
+ * @_name:   name of show attribute
+ * @_format: format string
+ * @_value:  value to print
+ *
+ * Generates attribute for a unit.
+ */
+#define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
+static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev,        \
+                                              char *buf)                 \
+{                                                                        \
+        struct scsi_device *sdev;                                        \
+        struct zfcp_unit *unit;                                          \
+                                                                         \
+        sdev = to_scsi_device(dev);                                      \
+        unit = sdev->hostdata;                                           \
+        return sprintf(buf, _format, _value);                            \
+}                                                                        \
+                                                                         \
+static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
+
+ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
+ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
+ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
+
+static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
+	&dev_attr_fcp_lun,
+	&dev_attr_wwpn,
+	&dev_attr_hba_id,
+	NULL
+};
+
+#undef ZFCP_LOG_AREA