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