]> err.no Git - linux-2.6/commitdiff
[SCSI] zfcp: Cleanup qdio code
authorSwen Schillig <swen@vnet.ibm.com>
Tue, 10 Jun 2008 16:20:57 +0000 (18:20 +0200)
committerJames Bottomley <James.Bottomley@HansenPartnership.com>
Sat, 12 Jul 2008 13:22:25 +0000 (08:22 -0500)
Cleanup the interface code from zfcp to qdio. Also move code that
belongs to the qdio interface from the erp to the qdio file.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
drivers/s390/scsi/zfcp_aux.c
drivers/s390/scsi/zfcp_dbf.c
drivers/s390/scsi/zfcp_def.h
drivers/s390/scsi/zfcp_erp.c
drivers/s390/scsi/zfcp_ext.h
drivers/s390/scsi/zfcp_fsf.c
drivers/s390/scsi/zfcp_qdio.c

index 735f7af43d6ab1a9fb8cfca706cc8a44cb674897..7084a6ae10963028747ab474464def0ca5646036 100644 (file)
@@ -606,7 +606,6 @@ static void _zfcp_status_read_scheduler(struct work_struct *work)
 struct zfcp_adapter *
 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 {
-       int retval = 0;
        struct zfcp_adapter *adapter;
 
        /*
@@ -627,19 +626,11 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
        /* save ccw_device pointer */
        adapter->ccw_device = ccw_device;
 
-       retval = zfcp_qdio_allocate_queues(adapter);
-       if (retval)
-               goto queues_alloc_failed;
-
-       retval = zfcp_qdio_allocate(adapter);
-       if (retval)
+       if (zfcp_qdio_allocate(adapter))
                goto qdio_allocate_failed;
 
-       retval = zfcp_allocate_low_mem_buffers(adapter);
-       if (retval) {
-               ZFCP_LOG_INFO("error: pool allocation failed\n");
+       if (zfcp_allocate_low_mem_buffers(adapter))
                goto failed_low_mem_buffers;
-       }
 
        /* initialise reference count stuff */
        atomic_set(&adapter->refcount, 0);
@@ -653,11 +644,8 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 
        /* initialize list of fsf requests */
        spin_lock_init(&adapter->req_list_lock);
-       retval = zfcp_reqlist_alloc(adapter);
-       if (retval) {
-               ZFCP_LOG_INFO("request list initialization failed\n");
+       if (zfcp_reqlist_alloc(adapter))
                goto failed_low_mem_buffers;
-       }
 
        /* initialize debug locks */
 
@@ -666,8 +654,7 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
        spin_lock_init(&adapter->scsi_dbf_lock);
        spin_lock_init(&adapter->rec_dbf_lock);
 
-       retval = zfcp_adapter_debug_register(adapter);
-       if (retval)
+       if (zfcp_adapter_debug_register(adapter))
                goto debug_register_failed;
 
        /* initialize error recovery stuff */
@@ -685,7 +672,7 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
        init_waitqueue_head(&adapter->erp_done_wqh);
 
        /* initialize lock of associated request queue */
-       rwlock_init(&adapter->request_queue.queue_lock);
+       rwlock_init(&adapter->req_q.lock);
        INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
 
        /* mark adapter unusable as long as sysfs registration is not complete */
@@ -723,12 +710,8 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
        zfcp_reqlist_free(adapter);
  failed_low_mem_buffers:
        zfcp_free_low_mem_buffers(adapter);
-       if (qdio_free(ccw_device) != 0)
-               ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
-                               zfcp_get_busid_by_adapter(adapter));
  qdio_allocate_failed:
-       zfcp_qdio_free_queues(adapter);
- queues_alloc_failed:
+       zfcp_qdio_free(adapter);
        kfree(adapter);
        adapter = NULL;
  out:
@@ -757,10 +740,6 @@ zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
        retval = zfcp_reqlist_isempty(adapter);
        spin_unlock_irqrestore(&adapter->req_list_lock, flags);
        if (!retval) {
-               ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
-                               "%i requests outstanding\n",
-                               zfcp_get_busid_by_adapter(adapter), adapter,
-                               atomic_read(&adapter->reqs_active));
                retval = -EBUSY;
                goto out;
        }
@@ -775,19 +754,9 @@ zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
        /* decrease number of adapters in list */
        zfcp_data.adapters--;
 
-       ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
-                      "%i adapters still in list\n",
-                      zfcp_get_busid_by_adapter(adapter),
-                      adapter, zfcp_data.adapters);
-
-       retval = qdio_free(adapter->ccw_device);
-       if (retval)
-               ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
-                               zfcp_get_busid_by_adapter(adapter));
+       zfcp_qdio_free(adapter);
 
        zfcp_free_low_mem_buffers(adapter);
-       /* free memory of adapter data structure and queues */
-       zfcp_qdio_free_queues(adapter);
        zfcp_reqlist_free(adapter);
        kfree(adapter->fc_stats);
        kfree(adapter->stats_reset_data);
index 01e817abe0a5c61cb841c91a1cf25a5912254553..c47c23a01c7f1c4482e18c7768c8faa5d3874e9b 100644 (file)
@@ -603,13 +603,14 @@ static const char *zfcp_rec_dbf_ids[] = {
        [137]   = "hbaapi port open",
        [138]   = "hbaapi unit open",
        [139]   = "hbaapi unit shutdown",
-       [140]   = "qdio error",
+       [140]   = "qdio error outbound",
        [141]   = "scsi host reset",
        [142]   = "dismissing fsf request for recovery action",
        [143]   = "recovery action timed out",
        [144]   = "recovery action gone",
        [145]   = "recovery action being processed",
        [146]   = "recovery action ready for next step",
+       [147]   = "qdio error inbound",
 };
 
 static int zfcp_rec_dbf_view_format(debug_info_t *id, struct debug_view *view,
index 72f225817ebd20261291800f0b79f55379265be3..5fcb555e1484e9bccddb3b3704ac94ea1d7c34d9 100644 (file)
@@ -112,21 +112,10 @@ zfcp_address_to_sg(void *address, struct scatterlist *list, unsigned int size)
         /* max. number of (data buffer) SBALEs in largest SBAL chain
            multiplied with number of sectors per 4k block */
 
-/* FIXME(tune): free space should be one max. SBAL chain plus what? */
-#define ZFCP_QDIO_PCI_INTERVAL         (QDIO_MAX_BUFFERS_PER_Q \
-                                         - (ZFCP_MAX_SBALS_PER_REQ + 4))
-
 #define ZFCP_SBAL_TIMEOUT               (5*HZ)
 
 #define ZFCP_TYPE2_RECOVERY_TIME        8      /* seconds */
 
-/* queue polling (values in microseconds) */
-#define ZFCP_MAX_INPUT_THRESHOLD       5000    /* FIXME: tune */
-#define ZFCP_MAX_OUTPUT_THRESHOLD      1000    /* FIXME: tune */
-#define ZFCP_MIN_INPUT_THRESHOLD       1       /* ignored by QDIO layer */
-#define ZFCP_MIN_OUTPUT_THRESHOLD      1       /* ignored by QDIO layer */
-
-#define QDIO_SCSI_QFMT                 1       /* 1 for FSF */
 #define QBUFF_PER_PAGE                 (PAGE_SIZE / sizeof(struct qdio_buffer))
 
 /********************* FSF SPECIFIC DEFINES *********************************/
@@ -649,13 +638,13 @@ struct zfcp_send_els {
 };
 
 struct zfcp_qdio_queue {
-       struct qdio_buffer *buffer[QDIO_MAX_BUFFERS_PER_Q]; /* SBALs */
-       u8                 free_index;        /* index of next free bfr
+       struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q]; /* SBALs */
+       u8                 first;             /* index of next free bfr
                                                 in queue (free_count>0) */
-       atomic_t           free_count;        /* number of free buffers
+       atomic_t           count;             /* number of free buffers
                                                 in queue */
-       rwlock_t           queue_lock;        /* lock for operations on queue */
-        int                distance_from_int; /* SBALs used since PCI indication
+       rwlock_t           lock;              /* lock for operations on queue */
+       int                pci_batch;         /* SBALs since PCI indication
                                                 was last set */
 };
 
@@ -711,15 +700,14 @@ struct zfcp_adapter {
        struct list_head        port_remove_lh;    /* head of ports to be
                                                      removed */
        u32                     ports;             /* number of remote ports */
-       atomic_t                reqs_active;       /* # active FSF reqs */
        unsigned long           req_no;            /* unique FSF req number */
        struct list_head        *req_list;         /* list of pending reqs */
        spinlock_t              req_list_lock;     /* request list lock */
-       struct zfcp_qdio_queue  request_queue;     /* request queue */
+       struct zfcp_qdio_queue  req_q;             /* request queue */
        u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
        wait_queue_head_t       request_wq;        /* can be used to wait for
                                                      more avaliable SBALs */
-       struct zfcp_qdio_queue  response_queue;    /* response queue */
+       struct zfcp_qdio_queue  resp_q;    /* response queue */
        rwlock_t                abort_lock;        /* Protects against SCSI
                                                      stack abort/command
                                                      completion races */
index ee19be13e708f1926d56e1c1c68a6863bbc7abff..4a6d08363d4b98dc7c5414defe462a2be12ccf07 100644 (file)
@@ -113,41 +113,6 @@ static void zfcp_erp_action_to_running(struct zfcp_erp_action *);
 
 static void zfcp_erp_memwait_handler(unsigned long);
 
-/**
- * zfcp_close_qdio - close qdio queues for an adapter
- */
-static void zfcp_close_qdio(struct zfcp_adapter *adapter)
-{
-       struct zfcp_qdio_queue *req_queue;
-       int first, count;
-
-       if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status))
-               return;
-
-       /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
-       req_queue = &adapter->request_queue;
-       write_lock_irq(&req_queue->queue_lock);
-       atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
-       write_unlock_irq(&req_queue->queue_lock);
-
-       while (qdio_shutdown(adapter->ccw_device,
-                            QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS)
-               ssleep(1);
-
-       /* cleanup used outbound sbals */
-       count = atomic_read(&req_queue->free_count);
-       if (count < QDIO_MAX_BUFFERS_PER_Q) {
-               first = (req_queue->free_index+count) % QDIO_MAX_BUFFERS_PER_Q;
-               count = QDIO_MAX_BUFFERS_PER_Q - count;
-               zfcp_qdio_zero_sbals(req_queue->buffer, first, count);
-       }
-       req_queue->free_index = 0;
-       atomic_set(&req_queue->free_count, 0);
-       req_queue->distance_from_int = 0;
-       adapter->response_queue.free_index = 0;
-       atomic_set(&adapter->response_queue.free_count, 0);
-}
-
 /**
  * zfcp_close_fsf - stop FSF operations for an adapter
  *
@@ -158,7 +123,7 @@ static void zfcp_close_qdio(struct zfcp_adapter *adapter)
 static void zfcp_close_fsf(struct zfcp_adapter *adapter)
 {
        /* close queues to ensure that buffers are not accessed by adapter */
-       zfcp_close_qdio(adapter);
+       zfcp_qdio_close(adapter);
        zfcp_fsf_req_dismiss_all(adapter);
        /* reset FSF request sequence number */
        adapter->fsf_req_seq_no = 0;
@@ -1735,88 +1700,17 @@ zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *erp_action, int close)
 static int
 zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *erp_action)
 {
-       int retval;
-       int i;
-       volatile struct qdio_buffer_element *sbale;
        struct zfcp_adapter *adapter = erp_action->adapter;
 
-       if (atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
-               ZFCP_LOG_NORMAL("bug: second attempt to set up QDIO on "
-                               "adapter %s\n",
-                               zfcp_get_busid_by_adapter(adapter));
-               goto failed_sanity;
-       }
-
-       if (qdio_establish(&adapter->qdio_init_data) != 0) {
-               ZFCP_LOG_INFO("error: establishment of QDIO queues failed "
-                             "on adapter %s\n",
-                             zfcp_get_busid_by_adapter(adapter));
-               goto failed_qdio_establish;
-       }
-
-       if (qdio_activate(adapter->ccw_device, 0) != 0) {
-               ZFCP_LOG_INFO("error: activation of QDIO queues failed "
-                             "on adapter %s\n",
-                             zfcp_get_busid_by_adapter(adapter));
-               goto failed_qdio_activate;
-       }
-
-       /*
-        * put buffers into response queue,
-        */
-       for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
-               sbale = &(adapter->response_queue.buffer[i]->element[0]);
-               sbale->length = 0;
-               sbale->flags = SBAL_FLAGS_LAST_ENTRY;
-               sbale->addr = NULL;
-       }
-
-       ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, "
-                      "queue_no=%i, index_in_queue=%i, count=%i)\n",
-                      zfcp_get_busid_by_adapter(adapter),
-                      QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q);
-
-       retval = do_QDIO(adapter->ccw_device,
-                        QDIO_FLAG_SYNC_INPUT,
-                        0, 0, QDIO_MAX_BUFFERS_PER_Q, NULL);
-
-       if (retval) {
-               ZFCP_LOG_NORMAL("bug: setup of QDIO failed (retval=%d)\n",
-                               retval);
-               goto failed_do_qdio;
-       } else {
-               adapter->response_queue.free_index = 0;
-               atomic_set(&adapter->response_queue.free_count, 0);
-               ZFCP_LOG_DEBUG("%i buffers successfully enqueued to "
-                              "response queue\n", QDIO_MAX_BUFFERS_PER_Q);
-       }
-       /* set index of first avalable SBALS / number of available SBALS */
-       adapter->request_queue.free_index = 0;
-       atomic_set(&adapter->request_queue.free_count, QDIO_MAX_BUFFERS_PER_Q);
-       adapter->request_queue.distance_from_int = 0;
+       if (zfcp_qdio_open(adapter))
+               return ZFCP_ERP_FAILED;
 
        /* initialize waitqueue used to wait for free SBALs in requests queue */
        init_waitqueue_head(&adapter->request_wq);
 
        /* ok, we did it - skip all cleanups for different failures */
        atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
-       retval = ZFCP_ERP_SUCCEEDED;
-       goto out;
-
- failed_do_qdio:
-       /* NOP */
-
- failed_qdio_activate:
-       while (qdio_shutdown(adapter->ccw_device,
-                            QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS)
-               ssleep(1);
-
- failed_qdio_establish:
- failed_sanity:
-       retval = ZFCP_ERP_FAILED;
-
- out:
-       return retval;
+       return ZFCP_ERP_SUCCEEDED;
 }
 
 
index 867972898cb1d426d8cbb986d2773f02ee3200bf..6ffe2068ba8ad62bbcfa7690525437e3802ca8c6 100644 (file)
@@ -57,21 +57,17 @@ extern int  zfcp_ccw_register(void);
 
 extern void zfcp_qdio_zero_sbals(struct qdio_buffer **, int, int);
 extern int  zfcp_qdio_allocate(struct zfcp_adapter *);
-extern int  zfcp_qdio_allocate_queues(struct zfcp_adapter *);
-extern void zfcp_qdio_free_queues(struct zfcp_adapter *);
-extern int  zfcp_qdio_determine_pci(struct zfcp_qdio_queue *,
-                                   struct zfcp_fsf_req *);
+extern void zfcp_qdio_free(struct zfcp_adapter *);
+extern int  zfcp_qdio_send(struct zfcp_fsf_req *fsf_req);
 
 extern volatile struct qdio_buffer_element *zfcp_qdio_sbale_req
-       (struct zfcp_fsf_req *, int, int);
+       (struct zfcp_fsf_req *);
 extern volatile struct qdio_buffer_element *zfcp_qdio_sbale_curr
        (struct zfcp_fsf_req *);
 extern int zfcp_qdio_sbals_from_sg
-       (struct zfcp_fsf_req *, unsigned long, struct scatterlist *, int, int);
-extern int zfcp_qdio_sbals_from_scsicmnd
-       (struct zfcp_fsf_req *, unsigned long, struct scsi_cmnd *);
-
-
+       (struct zfcp_fsf_req *, unsigned long, struct scatterlist *, int);
+extern int zfcp_qdio_open(struct zfcp_adapter *adapter);
+extern void zfcp_qdio_close(struct zfcp_adapter *adapter);
 /******************************** FSF ****************************************/
 extern int  zfcp_fsf_open_port(struct zfcp_erp_action *);
 extern int  zfcp_fsf_close_port(struct zfcp_erp_action *);
@@ -95,7 +91,7 @@ extern int  zfcp_fsf_status_read(struct zfcp_adapter *, int);
 extern int zfcp_status_read_refill(struct zfcp_adapter *adapter);
 extern int zfcp_fsf_req_create(struct zfcp_adapter *, u32, int, mempool_t *,
                               unsigned long *, struct zfcp_fsf_req **)
-       __acquires(adapter->request_queue.queue_lock);
+       __acquires(adapter->req_q.lock);
 extern int zfcp_fsf_send_ct(struct zfcp_send_ct *, mempool_t *,
                            struct zfcp_erp_action *);
 extern int zfcp_fsf_send_els(struct zfcp_send_els *);
index de42a01fc4b1ded4278881d5ed54b7971e452d94..cc48a6462e6cf33816e7181e8ec11e194bd58b2c 100644 (file)
@@ -171,7 +171,6 @@ void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 
        BUG_ON(atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status));
        spin_lock_irqsave(&adapter->req_list_lock, flags);
-       atomic_set(&adapter->reqs_active, 0);
        for (i = 0; i < REQUEST_LIST_SIZE; i++)
                list_splice_init(&adapter->req_list[i], &remove_queue);
        spin_unlock_irqrestore(&adapter->req_list_lock, flags);
@@ -726,7 +725,7 @@ zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
                goto failed_req_create;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
         sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
         fsf_req->sbale_curr = 2;
@@ -763,7 +762,7 @@ zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
  failed_req_create:
        zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
  out:
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
        return retval;
 }
 
@@ -1075,7 +1074,7 @@ zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
                        &unit->status)))
                goto unit_blocked;
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -1098,7 +1097,7 @@ zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
                fsf_req = NULL;
 
  out:
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
        return fsf_req;
 }
 
@@ -1295,7 +1294,7 @@ zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
                goto failed_req;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
         if (zfcp_use_one_sbal(ct->req, ct->req_count,
                               ct->resp, ct->resp_count)){
                 /* both request buffer and response buffer
@@ -1311,7 +1310,7 @@ zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
                 /* try to use chained SBALs */
                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
-                                                ct->req, ct->req_count,
+                                               ct->req,
                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
                 if (bytes <= 0) {
                         ZFCP_LOG_INFO("error: creation of CT request failed "
@@ -1328,7 +1327,7 @@ zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
-                                                ct->resp, ct->resp_count,
+                                               ct->resp,
                                                 ZFCP_MAX_SBALS_PER_CT_REQ);
                 if (bytes <= 0) {
                         ZFCP_LOG_INFO("error: creation of CT request failed "
@@ -1387,8 +1386,7 @@ zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
         }
  failed_req:
  out:
-        write_unlock_irqrestore(&adapter->request_queue.queue_lock,
-                               lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
        return ret;
 }
 
@@ -1593,7 +1591,7 @@ zfcp_fsf_send_els(struct zfcp_send_els *els)
                goto port_blocked;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
         if (zfcp_use_one_sbal(els->req, els->req_count,
                               els->resp, els->resp_count)){
                 /* both request buffer and response buffer
@@ -1609,7 +1607,7 @@ zfcp_fsf_send_els(struct zfcp_send_els *els)
                 /* try to use chained SBALs */
                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
-                                                els->req, els->req_count,
+                                               els->req,
                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
                 if (bytes <= 0) {
                         ZFCP_LOG_INFO("error: creation of ELS request failed "
@@ -1626,7 +1624,7 @@ zfcp_fsf_send_els(struct zfcp_send_els *els)
                 fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
                 bytes = zfcp_qdio_sbals_from_sg(fsf_req,
                                                 SBAL_FLAGS0_TYPE_WRITE_READ,
-                                                els->resp, els->resp_count,
+                                               els->resp,
                                                 ZFCP_MAX_SBALS_PER_ELS_REQ);
                 if (bytes <= 0) {
                         ZFCP_LOG_INFO("error: creation of ELS request failed "
@@ -1657,7 +1655,7 @@ zfcp_fsf_send_els(struct zfcp_send_els *els)
        fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
        fsf_req->data = (unsigned long) els;
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
 
        zfcp_san_dbf_event_els_request(fsf_req);
 
@@ -1680,8 +1678,7 @@ zfcp_fsf_send_els(struct zfcp_send_els *els)
 
  failed_req:
  out:
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock,
-                               lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
 
         return ret;
 }
@@ -1863,12 +1860,11 @@ zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
                ZFCP_LOG_INFO("error: Could not create exchange configuration "
                              "data request for adapter %s.\n",
                              zfcp_get_busid_by_adapter(adapter));
-               write_unlock_irqrestore(&adapter->request_queue.queue_lock,
-                                       lock_flags);
+               write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
                return retval;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -1882,8 +1878,7 @@ zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
 
        zfcp_erp_start_timer(fsf_req);
        retval = zfcp_fsf_req_send(fsf_req);
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock,
-                               lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
        if (retval) {
                ZFCP_LOG_INFO("error: Could not send exchange configuration "
                              "data command on the adapter %s\n",
@@ -1916,12 +1911,11 @@ zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
                ZFCP_LOG_INFO("error: Could not create exchange configuration "
                              "data request for adapter %s.\n",
                              zfcp_get_busid_by_adapter(adapter));
-               write_unlock_irqrestore(&adapter->request_queue.queue_lock,
-                                       lock_flags);
+               write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
                return retval;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -1936,8 +1930,7 @@ zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
 
        zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
        retval = zfcp_fsf_req_send(fsf_req);
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock,
-                               lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
        if (retval)
                ZFCP_LOG_INFO("error: Could not send exchange configuration "
                              "data command on the adapter %s\n",
@@ -2178,12 +2171,11 @@ zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
                              "exchange port data request for "
                              "the adapter %s.\n",
                              zfcp_get_busid_by_adapter(adapter));
-               write_unlock_irqrestore(&adapter->request_queue.queue_lock,
-                                       lock_flags);
+               write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
                return retval;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -2192,7 +2184,7 @@ zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
        zfcp_erp_start_timer(fsf_req);
 
        retval = zfcp_fsf_req_send(fsf_req);
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
 
        if (retval) {
                ZFCP_LOG_INFO("error: Could not send an exchange port data "
@@ -2237,21 +2229,20 @@ zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
                              "exchange port data request for "
                              "the adapter %s.\n",
                              zfcp_get_busid_by_adapter(adapter));
-               write_unlock_irqrestore(&adapter->request_queue.queue_lock,
-                                       lock_flags);
+               write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
                return retval;
        }
 
        if (data)
                fsf_req->data = (unsigned long) data;
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
        zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
        retval = zfcp_fsf_req_send(fsf_req);
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
 
        if (retval)
                ZFCP_LOG_INFO("error: Could not send an exchange port data "
@@ -2355,7 +2346,7 @@ zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
                goto out;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -2382,8 +2373,7 @@ zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
                       zfcp_get_busid_by_adapter(erp_action->adapter),
                       erp_action->port->wwpn);
  out:
-       write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
-                               lock_flags);
+       write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
        return retval;
 }
 
@@ -2587,7 +2577,7 @@ zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
                goto out;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -2615,8 +2605,7 @@ zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
                       zfcp_get_busid_by_adapter(erp_action->adapter),
                       erp_action->port->wwpn);
  out:
-       write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
-                               lock_flags);
+       write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
        return retval;
 }
 
@@ -2716,7 +2705,7 @@ zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
                goto out;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -2746,8 +2735,7 @@ zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
                       zfcp_get_busid_by_adapter(erp_action->adapter),
                       erp_action->port->wwpn);
  out:
-       write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
-                               lock_flags);
+       write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
        return retval;
 }
 
@@ -2911,7 +2899,7 @@ zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
                goto out;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -2944,8 +2932,7 @@ zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
                       zfcp_get_busid_by_adapter(erp_action->adapter),
                       erp_action->port->wwpn, erp_action->unit->fcp_lun);
  out:
-       write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
-                               lock_flags);
+       write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
        return retval;
 }
 
@@ -3226,7 +3213,7 @@ zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
                goto out;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
         sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
         sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -3255,8 +3242,7 @@ zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
                       zfcp_get_busid_by_adapter(erp_action->adapter),
                       erp_action->port->wwpn, erp_action->unit->fcp_lun);
  out:
-       write_unlock_irqrestore(&erp_action->adapter->request_queue.queue_lock,
-                               lock_flags);
+       write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
        return retval;
 }
 
@@ -3498,7 +3484,9 @@ zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
                fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
 
        /* generate SBALEs from data buffer */
-       real_bytes = zfcp_qdio_sbals_from_scsicmnd(fsf_req, sbtype, scsi_cmnd);
+       real_bytes = zfcp_qdio_sbals_from_sg(fsf_req, sbtype,
+                                            scsi_sglist(scsi_cmnd),
+                                            ZFCP_MAX_SBALS_PER_REQ);
        if (unlikely(real_bytes < 0)) {
                if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ) {
                        ZFCP_LOG_DEBUG(
@@ -3556,7 +3544,7 @@ zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
        scsi_cmnd->host_scribble = NULL;
  success:
  failed_req_create:
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
        return retval;
 }
 
@@ -3609,7 +3597,7 @@ zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
        fsf_req->qtcb->bottom.io.fcp_cmnd_length =
                sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
 
@@ -3629,7 +3617,7 @@ zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
        fsf_req = NULL;
 
  out:
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
        return fsf_req;
 }
 
@@ -4216,7 +4204,7 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
                goto unlock_queue_lock;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        sbale[0].flags |= direction;
 
        bottom = &fsf_req->qtcb->bottom.support;
@@ -4224,7 +4212,7 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
        bottom->option = fsf_cfdc->option;
 
        bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
-                                       fsf_cfdc->sg, ZFCP_CFDC_PAGES,
+                                       fsf_cfdc->sg,
                                        ZFCP_MAX_SBALS_PER_REQ);
        if (bytes != ZFCP_CFDC_MAX_SIZE) {
                retval = -ENOMEM;
@@ -4237,7 +4225,7 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
                retval = -EPERM;
                goto free_fsf_req;
        }
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
 
        wait_event(fsf_req->completion_wq,
                   fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
@@ -4247,7 +4235,7 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
  free_fsf_req:
        zfcp_fsf_req_free(fsf_req);
  unlock_queue_lock:
-       write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
+       write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
        return ERR_PTR(retval);
 }
 
@@ -4261,10 +4249,10 @@ static inline int
 zfcp_fsf_req_sbal_check(unsigned long *flags,
                        struct zfcp_qdio_queue *queue, int needed)
 {
-       write_lock_irqsave(&queue->queue_lock, *flags);
-       if (likely(atomic_read(&queue->free_count) >= needed))
+       write_lock_irqsave(&queue->lock, *flags);
+       if (likely(atomic_read(&queue->count) >= needed))
                return 1;
-       write_unlock_irqrestore(&queue->queue_lock, *flags);
+       write_unlock_irqrestore(&queue->lock, *flags);
        return 0;
 }
 
@@ -4293,24 +4281,24 @@ zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req)
  * @req_flags: flags indicating whether to wait for needed SBAL or not
  * @lock_flags: lock_flags if queue_lock is taken
  * Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
- * Locks: lock adapter->request_queue->queue_lock on success
+ * Locks: lock adapter->req_q->lock on success
  */
 static int
 zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
                      unsigned long *lock_flags)
 {
         long ret;
-        struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
+       struct zfcp_qdio_queue *req_q = &adapter->req_q;
 
         if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
                 ret = wait_event_interruptible_timeout(adapter->request_wq,
-                       zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1),
+                       zfcp_fsf_req_sbal_check(lock_flags, req_q, 1),
                                                       ZFCP_SBAL_TIMEOUT);
                if (ret < 0)
                        return ret;
                if (!ret)
                        return -EIO;
-        } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_queue, 1))
+       } else if (!zfcp_fsf_req_sbal_check(lock_flags, req_q, 1))
                 return -EIO;
 
         return 0;
@@ -4340,7 +4328,7 @@ zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
        volatile struct qdio_buffer_element *sbale;
        struct zfcp_fsf_req *fsf_req = NULL;
        int ret = 0;
-       struct zfcp_qdio_queue *req_queue = &adapter->request_queue;
+       struct zfcp_qdio_queue *req_q = &adapter->req_q;
 
        /* allocate new FSF request */
        fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
@@ -4377,7 +4365,7 @@ zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
         */
 
        if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
-               write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
+               write_unlock_irqrestore(&req_q->lock, *lock_flags);
                ret = -EIO;
                goto failed_sbals;
        }
@@ -4387,15 +4375,15 @@ zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
                fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
        }
        fsf_req->sbal_number = 1;
-       fsf_req->sbal_first = req_queue->free_index;
-       fsf_req->sbal_last = req_queue->free_index;
+       fsf_req->sbal_first = req_q->first;
+       fsf_req->sbal_last = req_q->first;
         fsf_req->sbale_curr = 1;
 
        if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
                fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
        }
 
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
 
        /* setup common SBALE fields */
        sbale[0].addr = (void *) fsf_req->req_id;
@@ -4416,7 +4404,7 @@ zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
        fsf_req = NULL;
 
  failed_fsf_req:
-       write_lock_irqsave(&req_queue->queue_lock, *lock_flags);
+       write_lock_irqsave(&req_q->lock, *lock_flags);
  success:
        *fsf_req_p = fsf_req;
        return ret;
@@ -4433,18 +4421,17 @@ zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
 static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
 {
        struct zfcp_adapter *adapter;
-       struct zfcp_qdio_queue *req_queue;
+       struct zfcp_qdio_queue *req_q;
        volatile struct qdio_buffer_element *sbale;
        int inc_seq_no;
-       int new_distance_from_int;
        int retval = 0;
 
        adapter = fsf_req->adapter;
-       req_queue = &adapter->request_queue,
+       req_q = &adapter->req_q;
 
 
        /* FIXME(debug): remove it later */
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_first, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        ZFCP_LOG_DEBUG("SBALE0 flags=0x%x\n", sbale[0].flags);
        ZFCP_LOG_TRACE("HEX DUMP OF SBALE1 PAYLOAD:\n");
        ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_TRACE, (char *) sbale[1].addr,
@@ -4457,52 +4444,24 @@ static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
 
        inc_seq_no = (fsf_req->qtcb != NULL);
 
-       ZFCP_LOG_TRACE("request queue of adapter %s: "
-                      "next free SBAL is %i, %i free SBALs\n",
-                      zfcp_get_busid_by_adapter(adapter),
-                      req_queue->free_index,
-                      atomic_read(&req_queue->free_count));
-
-       ZFCP_LOG_DEBUG("calling do_QDIO adapter %s, flags=0x%x, queue_no=%i, "
-                      "index_in_queue=%i, count=%i, buffers=%p\n",
-                      zfcp_get_busid_by_adapter(adapter),
-                      QDIO_FLAG_SYNC_OUTPUT,
-                      0, fsf_req->sbal_first, fsf_req->sbal_number,
-                      &req_queue->buffer[fsf_req->sbal_first]);
-
-       /*
-        * adjust the number of free SBALs in request queue as well as
-        * position of first one
-        */
-       atomic_sub(fsf_req->sbal_number, &req_queue->free_count);
-       ZFCP_LOG_TRACE("free_count=%d\n", atomic_read(&req_queue->free_count));
-       req_queue->free_index += fsf_req->sbal_number;    /* increase */
-       req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;  /* wrap if needed */
-       new_distance_from_int = zfcp_qdio_determine_pci(req_queue, fsf_req);
-
        fsf_req->issued = get_clock();
 
-       retval = do_QDIO(adapter->ccw_device,
-                        QDIO_FLAG_SYNC_OUTPUT,
-                        0, fsf_req->sbal_first, fsf_req->sbal_number, NULL);
+       retval = zfcp_qdio_send(fsf_req);
 
        if (unlikely(retval)) {
                /* Queues are down..... */
-               retval = -EIO;
                del_timer(&fsf_req->timer);
                spin_lock(&adapter->req_list_lock);
                zfcp_reqlist_remove(adapter, fsf_req);
                spin_unlock(&adapter->req_list_lock);
                /* undo changes in request queue made for this request */
-               zfcp_qdio_zero_sbals(req_queue->buffer,
-                                    fsf_req->sbal_first, fsf_req->sbal_number);
-               atomic_add(fsf_req->sbal_number, &req_queue->free_count);
-               req_queue->free_index -= fsf_req->sbal_number;
-               req_queue->free_index += QDIO_MAX_BUFFERS_PER_Q;
-               req_queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; /* wrap */
+               atomic_add(fsf_req->sbal_number, &req_q->count);
+               req_q->first -= fsf_req->sbal_number;
+               req_q->first += QDIO_MAX_BUFFERS_PER_Q;
+               req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
                zfcp_erp_adapter_reopen(adapter, 0, 116, fsf_req);
+               retval = -EIO;
        } else {
-               req_queue->distance_from_int = new_distance_from_int;
                /*
                 * increase FSF sequence counter -
                 * this must only be done for request successfully enqueued to
@@ -4514,9 +4473,6 @@ static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
                /* Don't increase for unsolicited status */
                if (inc_seq_no)
                        adapter->fsf_req_seq_no++;
-
-               /* count FSF requests pending */
-               atomic_inc(&adapter->reqs_active);
        }
        return retval;
 }
index e71547357f62e29025529c23cdb6a7dd8c809090..bd6561d53589cad45faeffd9e0455f767f2f3e42 100644 (file)
 /*
- * This file is part of the zfcp device driver for
- * FCP adapters for IBM System z9 and zSeries.
+ * zfcp device driver
  *
- * (C) Copyright IBM Corp. 2002, 2006
+ * Setup and helper functions to access QDIO.
  *
- * 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.
+ * Copyright IBM Corporation 2002, 2008
  */
 
 #include "zfcp_ext.h"
 
-static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *, int);
-static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_get
-       (struct zfcp_qdio_queue *, int, int);
-static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_resp
-       (struct zfcp_fsf_req *, int, int);
-static volatile struct qdio_buffer_element *zfcp_qdio_sbal_chain
-       (struct zfcp_fsf_req *, unsigned long);
-static volatile struct qdio_buffer_element *zfcp_qdio_sbale_next
-       (struct zfcp_fsf_req *, unsigned long);
-static int zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *, int, int);
-static inline int zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *);
-static void zfcp_qdio_sbale_fill
-       (struct zfcp_fsf_req *, unsigned long, void *, int);
-static int zfcp_qdio_sbals_from_segment
-       (struct zfcp_fsf_req *, unsigned long, void *, unsigned long);
-
-static qdio_handler_t zfcp_qdio_request_handler;
-static qdio_handler_t zfcp_qdio_response_handler;
-static int zfcp_qdio_handler_error_check(struct zfcp_adapter *,
-       unsigned int, unsigned int, unsigned int, int, int);
-
-#define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_QDIO
+/* FIXME(tune): free space should be one max. SBAL chain plus what? */
+#define ZFCP_QDIO_PCI_INTERVAL (QDIO_MAX_BUFFERS_PER_Q \
+                               - (ZFCP_MAX_SBALS_PER_REQ + 4))
 
-/*
- * Frees BUFFER memory for each of the pointers of the struct qdio_buffer array
- * in the adapter struct sbuf is the pointer array.
- *
- * locks:       must only be called with zfcp_data.config_sema taken
- */
-static void
-zfcp_qdio_buffers_dequeue(struct qdio_buffer **sbuf)
-{
-       int pos;
-
-       for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE)
-               free_page((unsigned long) sbuf[pos]);
-}
-
-/*
- * Allocates BUFFER memory to each of the pointers of the qdio_buffer_t
- * array in the adapter struct.
- * Cur_buf is the pointer array
- *
- * returns:    zero on success else -ENOMEM
- * locks:       must only be called with zfcp_data.config_sema taken
- */
-static int
-zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbuf)
+static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
 {
        int pos;
 
        for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) {
-               sbuf[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
-               if (!sbuf[pos]) {
-                       zfcp_qdio_buffers_dequeue(sbuf);
+               sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
+               if (!sbal[pos])
                        return -ENOMEM;
-               }
        }
        for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++)
                if (pos % QBUFF_PER_PAGE)
-                       sbuf[pos] = sbuf[pos - 1] + 1;
+                       sbal[pos] = sbal[pos - 1] + 1;
        return 0;
 }
 
-/* locks:       must only be called with zfcp_data.config_sema taken */
-int
-zfcp_qdio_allocate_queues(struct zfcp_adapter *adapter)
+static volatile struct qdio_buffer_element *
+zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
 {
-       int ret;
-
-       ret = zfcp_qdio_buffers_enqueue(adapter->request_queue.buffer);
-       if (ret)
-               return ret;
-       return zfcp_qdio_buffers_enqueue(adapter->response_queue.buffer);
+       return &q->sbal[sbal_idx]->element[sbale_idx];
 }
 
-/* locks:       must only be called with zfcp_data.config_sema taken */
-void
-zfcp_qdio_free_queues(struct zfcp_adapter *adapter)
+/**
+ * zfcp_qdio_free - free memory used by request- and resposne queue
+ * @adapter: pointer to the zfcp_adapter structure
+ */
+void zfcp_qdio_free(struct zfcp_adapter *adapter)
 {
-       ZFCP_LOG_TRACE("freeing request_queue buffers\n");
-       zfcp_qdio_buffers_dequeue(adapter->request_queue.buffer);
-
-       ZFCP_LOG_TRACE("freeing response_queue buffers\n");
-       zfcp_qdio_buffers_dequeue(adapter->response_queue.buffer);
-}
+       struct qdio_buffer **sbal_req, **sbal_resp;
+       int p;
 
-int
-zfcp_qdio_allocate(struct zfcp_adapter *adapter)
-{
-       struct qdio_initialize *init_data;
+       if (adapter->ccw_device)
+               qdio_free(adapter->ccw_device);
 
-       init_data = &adapter->qdio_init_data;
+       sbal_req = adapter->req_q.sbal;
+       sbal_resp = adapter->resp_q.sbal;
 
-       init_data->cdev = adapter->ccw_device;
-       init_data->q_format = QDIO_SCSI_QFMT;
-       memcpy(init_data->adapter_name, zfcp_get_busid_by_adapter(adapter), 8);
-       ASCEBC(init_data->adapter_name, 8);
-       init_data->qib_param_field_format = 0;
-       init_data->qib_param_field = NULL;
-       init_data->input_slib_elements = NULL;
-       init_data->output_slib_elements = NULL;
-       init_data->min_input_threshold = ZFCP_MIN_INPUT_THRESHOLD;
-       init_data->max_input_threshold = ZFCP_MAX_INPUT_THRESHOLD;
-       init_data->min_output_threshold = ZFCP_MIN_OUTPUT_THRESHOLD;
-       init_data->max_output_threshold = ZFCP_MAX_OUTPUT_THRESHOLD;
-       init_data->no_input_qs = 1;
-       init_data->no_output_qs = 1;
-       init_data->input_handler = zfcp_qdio_response_handler;
-       init_data->output_handler = zfcp_qdio_request_handler;
-       init_data->int_parm = (unsigned long) adapter;
-       init_data->flags = QDIO_INBOUND_0COPY_SBALS |
-           QDIO_OUTBOUND_0COPY_SBALS | QDIO_USE_OUTBOUND_PCIS;
-       init_data->input_sbal_addr_array =
-           (void **) (adapter->response_queue.buffer);
-       init_data->output_sbal_addr_array =
-           (void **) (adapter->request_queue.buffer);
-
-       return qdio_allocate(init_data);
+       for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
+               free_page((unsigned long) sbal_req[p]);
+               free_page((unsigned long) sbal_resp[p]);
+       }
 }
 
-/*
- * function:           zfcp_qdio_handler_error_check
- *
- * purpose:     called by the response handler to determine error condition
- *
- * returns:    error flag
- *
- */
-static int
-zfcp_qdio_handler_error_check(struct zfcp_adapter *adapter, unsigned int status,
-                             unsigned int qdio_error, unsigned int siga_error,
-                             int first_element, int elements_processed)
+static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, u8 id)
 {
-       int retval = 0;
+       dev_warn(&adapter->ccw_device->dev, "QDIO problem occurred.\n");
 
-       if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
-               retval = -EIO;
-
-               ZFCP_LOG_INFO("QDIO problem occurred (status=0x%x, "
-                             "qdio_error=0x%x, siga_error=0x%x)\n",
-                             status, qdio_error, siga_error);
-
-               zfcp_hba_dbf_event_qdio(adapter, status, qdio_error, siga_error,
-                               first_element, elements_processed);
-               /*
-                       * Restarting IO on the failed adapter from scratch.
-                * Since we have been using this adapter, it is save to assume
-                * that it is not failed but recoverable. The card seems to
-                * report link-up events by self-initiated queue shutdown.
-                * That is why we need to clear the link-down flag
-                * which is set again in case we have missed by a mile.
-                */
-               zfcp_erp_adapter_reopen(adapter,
-                                       ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
-                                       ZFCP_STATUS_COMMON_ERP_FAILED, 140,
-                                       NULL);
-       }
-       return retval;
+       zfcp_erp_adapter_reopen(adapter,
+                               ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
+                               ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
 }
 
-/*
- * function:    zfcp_qdio_request_handler
- *
- * purpose:    is called by QDIO layer for completed SBALs in request queue
- *
- * returns:    (void)
- */
-static void
-zfcp_qdio_request_handler(struct ccw_device *ccw_device,
-                         unsigned int status,
-                         unsigned int qdio_error,
-                         unsigned int siga_error,
-                         unsigned int queue_number,
-                         int first_element,
-                         int elements_processed,
-                         unsigned long int_parm)
+static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int status,
+                             unsigned int qdio_err, unsigned int siga_err,
+                             unsigned int queue_no, int first, int count,
+                             unsigned long parm)
 {
-       struct zfcp_adapter *adapter;
-       struct zfcp_qdio_queue *queue;
-
-       adapter = (struct zfcp_adapter *) int_parm;
-       queue = &adapter->request_queue;
+       struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
+       struct zfcp_qdio_queue *queue = &adapter->req_q;
 
-       ZFCP_LOG_DEBUG("adapter %s, first=%d, elements_processed=%d\n",
-                      zfcp_get_busid_by_adapter(adapter),
-                      first_element, elements_processed);
-
-       if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error,
-                                                  siga_error, first_element,
-                                                  elements_processed)))
-               goto out;
-       /*
-        * we stored address of struct zfcp_adapter  data structure
-        * associated with irq in int_parm
-        */
+       if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
+               zfcp_hba_dbf_event_qdio(adapter, status, qdio_err, siga_err,
+                                       first, count);
+               zfcp_qdio_handler_error(adapter, 140);
+               return;
+       }
 
        /* cleanup all SBALs being program-owned now */
-       zfcp_qdio_zero_sbals(queue->buffer, first_element, elements_processed);
+       zfcp_qdio_zero_sbals(queue->sbal, first, count);
 
-       /* increase free space in outbound queue */
-       atomic_add(elements_processed, &queue->free_count);
-       ZFCP_LOG_DEBUG("free_count=%d\n", atomic_read(&queue->free_count));
+       atomic_add(count, &queue->count);
        wake_up(&adapter->request_wq);
-       ZFCP_LOG_DEBUG("elements_processed=%d, free count=%d\n",
-                      elements_processed, atomic_read(&queue->free_count));
- out:
-       return;
 }
 
-/**
- * zfcp_qdio_reqid_check - checks for valid reqids.
- */
 static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
-                                 unsigned long req_id, int sbal)
+                                 unsigned long req_id, int sbal_idx)
 {
        struct zfcp_fsf_req *fsf_req;
        unsigned long flags;
@@ -248,204 +99,117 @@ static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
                 * Unknown request means that we have potentially memory
                 * corruption and must stop the machine immediatly.
                 */
-               panic("error: unknown request id (%ld) on adapter %s.\n",
+               panic("error: unknown request id (%lx) on adapter %s.\n",
                      req_id, zfcp_get_busid_by_adapter(adapter));
 
        zfcp_reqlist_remove(adapter, fsf_req);
-       atomic_dec(&adapter->reqs_active);
        spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 
-       fsf_req->sbal_response = sbal;
-       /* finish the FSF request */
+       fsf_req->sbal_response = sbal_idx;
        zfcp_fsf_req_complete(fsf_req);
 }
 
-/*
- * function:           zfcp_qdio_response_handler
- *
- * purpose:    is called by QDIO layer for completed SBALs in response queue
- *
- * returns:    (void)
- */
-static void
-zfcp_qdio_response_handler(struct ccw_device *ccw_device,
-                          unsigned int status,
-                          unsigned int qdio_error,
-                          unsigned int siga_error,
-                          unsigned int queue_number,
-                          int first_element,
-                          int elements_processed,
-                          unsigned long int_parm)
+static void zfcp_qdio_resp_put_back(struct zfcp_adapter *adapter, int processed)
 {
-       struct zfcp_adapter *adapter;
-       struct zfcp_qdio_queue *queue;
-       int buffer_index;
-       int i;
-       struct qdio_buffer *buffer;
-       int retval = 0;
-       u8 count;
-       u8 start;
-       volatile struct qdio_buffer_element *buffere = NULL;
-       int buffere_index;
-
-       adapter = (struct zfcp_adapter *) int_parm;
-       queue = &adapter->response_queue;
-
-       if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error,
-                                                  siga_error, first_element,
-                                                  elements_processed)))
-               goto out;
+       struct zfcp_qdio_queue *queue = &adapter->resp_q;
+       struct ccw_device *cdev = adapter->ccw_device;
+       u8 count, start = queue->first;
+       unsigned int retval;
 
-       /*
-        * we stored address of struct zfcp_adapter  data structure
-        * associated with irq in int_parm
-        */
+       count = atomic_read(&queue->count) + processed;
+
+       retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
+                        0, start, count, NULL);
+
+       if (unlikely(retval)) {
+               atomic_set(&queue->count, count);
+               /* FIXME: Recover this with an adapter reopen? */
+       } else {
+               queue->first += count;
+               queue->first %= QDIO_MAX_BUFFERS_PER_Q;
+               atomic_set(&queue->count, 0);
+       }
+}
+
+static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int status,
+                              unsigned int qdio_err, unsigned int siga_err,
+                              unsigned int queue_no, int first, int count,
+                              unsigned long parm)
+{
+       struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
+       struct zfcp_qdio_queue *queue = &adapter->resp_q;
+       volatile struct qdio_buffer_element *sbale;
+       int sbal_idx, sbale_idx, sbal_no;
+
+       if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
+               zfcp_hba_dbf_event_qdio(adapter, status, qdio_err, siga_err,
+                                       first, count);
+               zfcp_qdio_handler_error(adapter, 147);
+               return;
+       }
 
-       buffere = &(queue->buffer[first_element]->element[0]);
-       ZFCP_LOG_DEBUG("first BUFFERE flags=0x%x\n", buffere->flags);
        /*
         * go through all SBALs from input queue currently
         * returned by QDIO layer
         */
-
-       for (i = 0; i < elements_processed; i++) {
-
-               buffer_index = first_element + i;
-               buffer_index %= QDIO_MAX_BUFFERS_PER_Q;
-               buffer = queue->buffer[buffer_index];
+       for (sbal_no = 0; sbal_no < count; sbal_no++) {
+               sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
 
                /* go through all SBALEs of SBAL */
-               for (buffere_index = 0;
-                    buffere_index < QDIO_MAX_ELEMENTS_PER_BUFFER;
-                    buffere_index++) {
-
-                       /* look for QDIO request identifiers in SB */
-                       buffere = &buffer->element[buffere_index];
+               for (sbale_idx = 0; sbale_idx < QDIO_MAX_ELEMENTS_PER_BUFFER;
+                    sbale_idx++) {
+                       sbale = zfcp_qdio_sbale(queue, sbal_idx, sbale_idx);
                        zfcp_qdio_reqid_check(adapter,
-                                             (unsigned long) buffere->addr, i);
-
-                       /*
-                        * A single used SBALE per inbound SBALE has been
-                        * implemented by QDIO so far. Hope they will
-                        * do some optimisation. Will need to change to
-                        * unlikely() then.
-                        */
-                       if (likely(buffere->flags & SBAL_FLAGS_LAST_ENTRY))
+                                             (unsigned long) sbale->addr,
+                                             sbal_idx);
+                       if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY))
                                break;
                };
 
-               if (unlikely(!(buffere->flags & SBAL_FLAGS_LAST_ENTRY))) {
-                       ZFCP_LOG_NORMAL("bug: End of inbound data "
-                                       "not marked!\n");
-               }
+               if (unlikely(!(sbale->flags & SBAL_FLAGS_LAST_ENTRY)))
+                       dev_warn(&adapter->ccw_device->dev,
+                                "Protocol violation by adapter. "
+                                "Continuing operations.\n");
        }
 
        /*
         * put range of SBALs back to response queue
         * (including SBALs which have already been free before)
         */
-       count = atomic_read(&queue->free_count) + elements_processed;
-       start = queue->free_index;
-
-       ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, "
-                      "queue_no=%i, index_in_queue=%i, count=%i, "
-                      "buffers=0x%lx\n",
-                      zfcp_get_busid_by_adapter(adapter),
-                      QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
-                      0, start, count, (unsigned long) &queue->buffer[start]);
-
-       retval = do_QDIO(ccw_device,
-                        QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
-                        0, start, count, NULL);
-
-       if (unlikely(retval)) {
-               atomic_set(&queue->free_count, count);
-               ZFCP_LOG_DEBUG("clearing of inbound data regions failed, "
-                              "queues may be down "
-                              "(count=%d, start=%d, retval=%d)\n",
-                              count, start, retval);
-       } else {
-               queue->free_index += count;
-               queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;
-               atomic_set(&queue->free_count, 0);
-               ZFCP_LOG_TRACE("%i buffers enqueued to response "
-                              "queue at position %i\n", count, start);
-       }
- out:
-       return;
+       zfcp_qdio_resp_put_back(adapter, count);
 }
 
 /**
- * zfcp_qdio_sbale_get - return pointer to SBALE of qdio_queue
- * @queue: queue from which SBALE should be returned
- * @sbal: specifies number of SBAL in queue
- * @sbale: specifes number of SBALE in SBAL
- */
-static inline volatile struct qdio_buffer_element *
-zfcp_qdio_sbale_get(struct zfcp_qdio_queue *queue, int sbal, int sbale)
-{
-       return &queue->buffer[sbal]->element[sbale];
-}
-
-/**
- * zfcp_qdio_sbale_req - return pointer to SBALE of request_queue for
- *     a struct zfcp_fsf_req
+ * zfcp_qdio_sbale_req - return ptr to SBALE of req_q for a struct zfcp_fsf_req
+ * @fsf_req: pointer to struct fsf_req
+ * Returns: pointer to qdio_buffer_element (SBALE) structure
  */
 volatile struct qdio_buffer_element *
-zfcp_qdio_sbale_req(struct zfcp_fsf_req *fsf_req, int sbal, int sbale)
-{
-       return zfcp_qdio_sbale_get(&fsf_req->adapter->request_queue,
-                                  sbal, sbale);
-}
-
-/**
- * zfcp_qdio_sbale_resp - return pointer to SBALE of response_queue for
- *     a struct zfcp_fsf_req
- */
-static inline volatile struct qdio_buffer_element *
-zfcp_qdio_sbale_resp(struct zfcp_fsf_req *fsf_req, int sbal, int sbale)
+zfcp_qdio_sbale_req(struct zfcp_fsf_req *req)
 {
-       return zfcp_qdio_sbale_get(&fsf_req->adapter->response_queue,
-                                  sbal, sbale);
+       return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, 0);
 }
 
 /**
- * zfcp_qdio_sbale_curr - return current SBALE on request_queue for
- *     a struct zfcp_fsf_req
+ * zfcp_qdio_sbale_curr - return curr SBALE on req_q for a struct zfcp_fsf_req
+ * @fsf_req: pointer to struct fsf_req
+ * Returns: pointer to qdio_buffer_element (SBALE) structure
  */
 volatile struct qdio_buffer_element *
-zfcp_qdio_sbale_curr(struct zfcp_fsf_req *fsf_req)
+zfcp_qdio_sbale_curr(struct zfcp_fsf_req *req)
 {
-       return zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last,
-                                  fsf_req->sbale_curr);
+       return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last,
+                              req->sbale_curr);
 }
 
-/**
- * zfcp_qdio_sbal_limit - determine maximum number of SBALs that can be used
- *     on the request_queue for a struct zfcp_fsf_req
- * @fsf_req: the number of the last SBAL that can be used is stored herein
- * @max_sbals: used to pass an upper limit for the number of SBALs
- *
- * Note: We can assume at least one free SBAL in the request_queue when called.
- */
-static void
-zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
+static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
 {
-       int count = atomic_read(&fsf_req->adapter->request_queue.free_count);
+       int count = atomic_read(&fsf_req->adapter->req_q.count);
        count = min(count, max_sbals);
-       fsf_req->sbal_limit  = fsf_req->sbal_first;
-       fsf_req->sbal_limit += (count - 1);
-       fsf_req->sbal_limit %= QDIO_MAX_BUFFERS_PER_Q;
+       fsf_req->sbal_limit = (fsf_req->sbal_first + count - 1)
+                                       % QDIO_MAX_BUFFERS_PER_Q;
 }
 
-/**
- * zfcp_qdio_sbal_chain - chain SBALs if more than one SBAL is needed for a
- *     request
- * @fsf_req: zfcp_fsf_req to be processed
- * @sbtype: SBAL flags which have to be set in first SBALE of new SBAL
- *
- * This function changes sbal_last, sbale_curr, sbal_number of fsf_req.
- */
 static volatile struct qdio_buffer_element *
 zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
 {
@@ -460,7 +224,7 @@ zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
                return NULL;
 
        /* set chaining flag in first SBALE of current SBAL */
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        sbale->flags |= SBAL_FLAGS0_MORE_SBALS;
 
        /* calculate index of next SBAL */
@@ -480,214 +244,271 @@ zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
        return sbale;
 }
 
-/**
- * zfcp_qdio_sbale_next - switch to next SBALE, chain SBALs if needed
- */
 static volatile struct qdio_buffer_element *
 zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
 {
        if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL)
                return zfcp_qdio_sbal_chain(fsf_req, sbtype);
-
        fsf_req->sbale_curr++;
-
        return zfcp_qdio_sbale_curr(fsf_req);
 }
 
-/**
- * zfcp_qdio_sbals_zero - initialize SBALs between first and last in queue
- *     with zero from
- */
-static int
-zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *queue, int first, int last)
+static void zfcp_qdio_undo_sbals(struct zfcp_fsf_req *fsf_req)
 {
-       struct qdio_buffer **buf = queue->buffer;
-       int curr = first;
-       int count = 0;
-
-       for(;;) {
-               curr %= QDIO_MAX_BUFFERS_PER_Q;
-               count++;
-               memset(buf[curr], 0, sizeof(struct qdio_buffer));
-               if (curr == last)
-                       break;
-               curr++;
-       }
-       return count;
+       struct qdio_buffer **sbal = fsf_req->adapter->req_q.sbal;
+       int first = fsf_req->sbal_first;
+       int last = fsf_req->sbal_last;
+       int count = (last - first + QDIO_MAX_BUFFERS_PER_Q) %
+               QDIO_MAX_BUFFERS_PER_Q + 1;
+       zfcp_qdio_zero_sbals(sbal, first, count);
 }
 
-
-/**
- * zfcp_qdio_sbals_wipe - reset all changes in SBALs for an fsf_req
- */
-static inline int
-zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *fsf_req)
-{
-       return zfcp_qdio_sbals_zero(&fsf_req->adapter->request_queue,
-                                   fsf_req->sbal_first, fsf_req->sbal_last);
-}
-
-
-/**
- * zfcp_qdio_sbale_fill - set address and length in current SBALE
- *     on request_queue
- */
-static void
-zfcp_qdio_sbale_fill(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
-                    void *addr, int length)
+static int zfcp_qdio_fill_sbals(struct zfcp_fsf_req *fsf_req,
+                               unsigned int sbtype, void *start_addr,
+                               unsigned int total_length)
 {
        volatile struct qdio_buffer_element *sbale;
-
-       sbale = zfcp_qdio_sbale_curr(fsf_req);
-       sbale->addr = addr;
-       sbale->length = length;
-}
-
-/**
- * zfcp_qdio_sbals_from_segment - map memory segment to SBALE(s)
- * @fsf_req: request to be processed
- * @sbtype: SBALE flags
- * @start_addr: address of memory segment
- * @total_length: length of memory segment
- *
- * Alignment and length of the segment determine how many SBALEs are needed
- * for the memory segment.
- */
-static int
-zfcp_qdio_sbals_from_segment(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
-                            void *start_addr, unsigned long total_length)
-{
        unsigned long remaining, length;
        void *addr;
 
-       /* split segment up heeding page boundaries */
+       /* split segment up */
        for (addr = start_addr, remaining = total_length; remaining > 0;
             addr += length, remaining -= length) {
-               /* get next free SBALE for new piece */
-               if (NULL == zfcp_qdio_sbale_next(fsf_req, sbtype)) {
-                       /* no SBALE left, clean up and leave */
-                       zfcp_qdio_sbals_wipe(fsf_req);
+               sbale = zfcp_qdio_sbale_next(fsf_req, sbtype);
+               if (!sbale) {
+                       zfcp_qdio_undo_sbals(fsf_req);
                        return -EINVAL;
                }
-               /* calculate length of new piece */
+
+               /* new piece must not exceed next page boundary */
                length = min(remaining,
-                            (PAGE_SIZE - ((unsigned long) addr &
+                            (PAGE_SIZE - ((unsigned long)addr &
                                           (PAGE_SIZE - 1))));
-               /* fill current SBALE with calculated piece */
-               zfcp_qdio_sbale_fill(fsf_req, sbtype, addr, length);
+               sbale->addr = addr;
+               sbale->length = length;
        }
-       return total_length;
+       return 0;
 }
 
-
 /**
  * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
  * @fsf_req: request to be processed
  * @sbtype: SBALE flags
  * @sg: scatter-gather list
- * @sg_count: number of elements in scatter-gather list
  * @max_sbals: upper bound for number of SBALs to be used
+ * Returns: number of bytes, or error (negativ)
  */
-int
-zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
-                        struct scatterlist *sgl, int sg_count, int max_sbals)
+int zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
+                           struct scatterlist *sg, int max_sbals)
 {
-       int sg_index;
-       struct scatterlist *sg_segment;
-       int retval;
        volatile struct qdio_buffer_element *sbale;
-       int bytes = 0;
+       int retval, bytes = 0;
 
        /* figure out last allowed SBAL */
        zfcp_qdio_sbal_limit(fsf_req, max_sbals);
 
-       /* set storage-block type for current SBAL */
-       sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
+       /* set storage-block type for this request */
+       sbale = zfcp_qdio_sbale_req(fsf_req);
        sbale->flags |= sbtype;
 
-       /* process all segements of scatter-gather list */
-       for_each_sg(sgl, sg_segment, sg_count, sg_index) {
-               retval = zfcp_qdio_sbals_from_segment(
-                               fsf_req,
-                               sbtype,
-                               zfcp_sg_to_address(sg_segment),
-                               sg_segment->length);
-               if (retval < 0) {
-                       bytes = retval;
-                       goto out;
-               } else
-                        bytes += retval;
+       for (; sg; sg = sg_next(sg)) {
+               retval = zfcp_qdio_fill_sbals(fsf_req, sbtype, sg_virt(sg),
+                                             sg->length);
+               if (retval < 0)
+                       return retval;
+               bytes += sg->length;
        }
+
        /* assume that no other SBALEs are to follow in the same SBAL */
        sbale = zfcp_qdio_sbale_curr(fsf_req);
        sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
-out:
+
        return bytes;
 }
 
-
 /**
- * zfcp_qdio_sbals_from_scsicmnd - fill SBALs from scsi command
- * @fsf_req: request to be processed
- * @sbtype: SBALE flags
- * @scsi_cmnd: either scatter-gather list or buffer contained herein is used
- *     to fill SBALs
+ * zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
+ * @fsf_req: pointer to struct zfcp_fsf_req
+ * Returns: 0 on success, error otherwise
  */
-int
-zfcp_qdio_sbals_from_scsicmnd(struct zfcp_fsf_req *fsf_req,
-                             unsigned long sbtype, struct scsi_cmnd *scsi_cmnd)
+int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
 {
-       return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, scsi_sglist(scsi_cmnd),
-                                      scsi_sg_count(scsi_cmnd),
-                                      ZFCP_MAX_SBALS_PER_REQ);
+       struct zfcp_adapter *adapter = fsf_req->adapter;
+       struct zfcp_qdio_queue *req_q = &adapter->req_q;
+       int first = fsf_req->sbal_first;
+       int count = fsf_req->sbal_number;
+       int retval, pci, pci_batch;
+       volatile struct qdio_buffer_element *sbale;
+
+       /* acknowledgements for transferred buffers */
+       pci_batch = req_q->pci_batch + count;
+       if (unlikely(pci_batch >= ZFCP_QDIO_PCI_INTERVAL)) {
+               pci_batch %= ZFCP_QDIO_PCI_INTERVAL;
+               pci = first + count - (pci_batch + 1);
+               pci %= QDIO_MAX_BUFFERS_PER_Q;
+               sbale = zfcp_qdio_sbale(req_q, pci, 0);
+               sbale->flags |= SBAL_FLAGS0_PCI;
+       }
+
+       retval = do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, first,
+                        count, NULL);
+       if (unlikely(retval)) {
+               zfcp_qdio_zero_sbals(req_q->sbal, first, count);
+               return retval;
+       }
+
+       /* account for transferred buffers */
+       atomic_sub(count, &req_q->count);
+       req_q->first += count;
+       req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
+       req_q->pci_batch = pci_batch;
+       return 0;
 }
 
 /**
- * zfcp_qdio_determine_pci - set PCI flag in first SBALE on qdio queue if needed
+ * zfcp_qdio_zero_sbals - zero all sbals of the specified area and queue
+ * @buf: pointer to array of SBALS
+ * @first: integer specifying the SBAL number to start
+ * @count: integer specifying the number of SBALS to process
  */
-int
-zfcp_qdio_determine_pci(struct zfcp_qdio_queue *req_queue,
-                       struct zfcp_fsf_req *fsf_req)
+void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int count)
 {
-       int new_distance_from_int;
-       int pci_pos;
-       volatile struct qdio_buffer_element *sbale;
+       int i, sbal_idx;
 
-       new_distance_from_int = req_queue->distance_from_int +
-                fsf_req->sbal_number;
-
-       if (unlikely(new_distance_from_int >= ZFCP_QDIO_PCI_INTERVAL)) {
-               new_distance_from_int %= ZFCP_QDIO_PCI_INTERVAL;
-                pci_pos  = fsf_req->sbal_first;
-               pci_pos += fsf_req->sbal_number;
-               pci_pos -= new_distance_from_int;
-               pci_pos -= 1;
-               pci_pos %= QDIO_MAX_BUFFERS_PER_Q;
-               sbale = zfcp_qdio_sbale_req(fsf_req, pci_pos, 0);
-               sbale->flags |= SBAL_FLAGS0_PCI;
+       for (i = first; i < first + count; i++) {
+               sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
+               memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
        }
-       return new_distance_from_int;
 }
 
-/*
- * function:   zfcp_zero_sbals
- *
- * purpose:    zeros specified range of SBALs
- *
- * returns:
+/**
+ * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
+ * @adapter: pointer to struct zfcp_adapter
+ * Returns: -ENOMEM on memory allocation error or return value from
+ *          qdio_allocate
+ */
+int zfcp_qdio_allocate(struct zfcp_adapter *adapter)
+{
+       struct qdio_initialize *init_data;
+
+       if (zfcp_qdio_buffers_enqueue(adapter->req_q.sbal) ||
+                  zfcp_qdio_buffers_enqueue(adapter->resp_q.sbal))
+               return -ENOMEM;
+
+       init_data = &adapter->qdio_init_data;
+
+       init_data->cdev = adapter->ccw_device;
+       init_data->q_format = QDIO_ZFCP_QFMT;
+       memcpy(init_data->adapter_name, zfcp_get_busid_by_adapter(adapter), 8);
+       ASCEBC(init_data->adapter_name, 8);
+       init_data->qib_param_field_format = 0;
+       init_data->qib_param_field = NULL;
+       init_data->input_slib_elements = NULL;
+       init_data->output_slib_elements = NULL;
+       init_data->min_input_threshold = 1;
+       init_data->max_input_threshold = 5000;
+       init_data->min_output_threshold = 1;
+       init_data->max_output_threshold = 1000;
+       init_data->no_input_qs = 1;
+       init_data->no_output_qs = 1;
+       init_data->input_handler = zfcp_qdio_int_resp;
+       init_data->output_handler = zfcp_qdio_int_req;
+       init_data->int_parm = (unsigned long) adapter;
+       init_data->flags = QDIO_INBOUND_0COPY_SBALS |
+                       QDIO_OUTBOUND_0COPY_SBALS | QDIO_USE_OUTBOUND_PCIS;
+       init_data->input_sbal_addr_array =
+                       (void **) (adapter->resp_q.sbal);
+       init_data->output_sbal_addr_array =
+                       (void **) (adapter->req_q.sbal);
+
+       return qdio_allocate(init_data);
+}
+
+/**
+ * zfcp_close_qdio - close qdio queues for an adapter
  */
-void
-zfcp_qdio_zero_sbals(struct qdio_buffer *buf[], int first, int clean_count)
+void zfcp_qdio_close(struct zfcp_adapter *adapter)
 {
-       int cur_pos;
-       int index;
-
-       for (cur_pos = first; cur_pos < (first + clean_count); cur_pos++) {
-               index = cur_pos % QDIO_MAX_BUFFERS_PER_Q;
-               memset(buf[index], 0, sizeof (struct qdio_buffer));
-               ZFCP_LOG_TRACE("zeroing BUFFER %d at address %p\n",
-                              index, buf[index]);
+       struct zfcp_qdio_queue *req_q;
+       int first, count;
+
+       if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status))
+               return;
+
+       /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
+       req_q = &adapter->req_q;
+       write_lock_irq(&req_q->lock);
+       atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
+       write_unlock_irq(&req_q->lock);
+
+       while (qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR)
+                       == -EINPROGRESS)
+               ssleep(1);
+
+       /* cleanup used outbound sbals */
+       count = atomic_read(&req_q->count);
+       if (count < QDIO_MAX_BUFFERS_PER_Q) {
+               first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q;
+               count = QDIO_MAX_BUFFERS_PER_Q - count;
+               zfcp_qdio_zero_sbals(req_q->sbal, first, count);
        }
+       req_q->first = 0;
+       atomic_set(&req_q->count, 0);
+       req_q->pci_batch = 0;
+       adapter->resp_q.first = 0;
+       atomic_set(&adapter->resp_q.count, 0);
 }
 
-#undef ZFCP_LOG_AREA
+/**
+ * zfcp_qdio_open - prepare and initialize response queue
+ * @adapter: pointer to struct zfcp_adapter
+ * Returns: 0 on success, otherwise -EIO
+ */
+int zfcp_qdio_open(struct zfcp_adapter *adapter)
+{
+       volatile struct qdio_buffer_element *sbale;
+       int cc;
+
+       if (atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status))
+               return -EIO;
+
+       if (qdio_establish(&adapter->qdio_init_data)) {
+               dev_err(&adapter->ccw_device->dev,
+                        "Establish of QDIO queues failed.\n");
+               return -EIO;
+       }
+
+       if (qdio_activate(adapter->ccw_device, 0)) {
+               dev_err(&adapter->ccw_device->dev,
+                        "Activate of QDIO queues failed.\n");
+               goto failed_qdio;
+       }
+
+       for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
+               sbale = &(adapter->resp_q.sbal[cc]->element[0]);
+               sbale->length = 0;
+               sbale->flags = SBAL_FLAGS_LAST_ENTRY;
+               sbale->addr = NULL;
+       }
+
+       if (do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_INPUT, 0, 0,
+                    QDIO_MAX_BUFFERS_PER_Q, NULL)) {
+               dev_err(&adapter->ccw_device->dev,
+                        "Init of QDIO response queue failed.\n");
+               goto failed_qdio;
+       }
+
+       /* set index of first avalable SBALS / number of available SBALS */
+       adapter->req_q.first = 0;
+       atomic_set(&adapter->req_q.count, QDIO_MAX_BUFFERS_PER_Q);
+       adapter->req_q.pci_batch = 0;
+
+       return 0;
+
+failed_qdio:
+       while (qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR)
+                       == -EINPROGRESS)
+               ssleep(1);
+
+       return -EIO;
+}