iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[SCSI] zfcp: Cleanup qdio code

Browse Source 
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>
This commit is contained in:
Swen Schillig 2008-06-10 18:20:57 +02:00 committed by James Bottomley
parent fa04c28168
commit 00bab91066
7 changed files with 431 additions and 806 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/s390/scsi/zfcp_aux.c
View 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);

3
drivers/s390/scsi/zfcp_dbf.c
View 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,

26
drivers/s390/scsi/zfcp_def.h
View 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 */

114
drivers/s390/scsi/zfcp_erp.c
View 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;
}

18
drivers/s390/scsi/zfcp_ext.h
View 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 *);

178
drivers/s390/scsi/zfcp_fsf.c
View 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;
}

845
drivers/s390/scsi/zfcp_qdio.c
View File

@ -1,241 +1,92 @@
/*
* 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);
/* 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))
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
/*
* 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);
}
/* locks: must only be called with zfcp_data.config_sema taken */
void
zfcp_qdio_free_queues(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);
}
int
zfcp_qdio_allocate(struct zfcp_adapter *adapter)
{
struct qdio_initialize *init_data;
init_data = &adapter->qdio_init_data;
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);
}
/*
* 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)
{
int retval = 0;
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;
}
/*
* 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)
{
struct zfcp_adapter *adapter;
struct zfcp_qdio_queue *queue;
adapter = (struct zfcp_adapter *) int_parm;
queue = &adapter->request_queue;
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
*/
/* cleanup all SBALs being program-owned now */
zfcp_qdio_zero_sbals(queue->buffer, first_element, elements_processed);
/* 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));
wake_up(&adapter->request_wq);
ZFCP_LOG_DEBUG("elements_processed=%d, free count=%d\n",
elements_processed, atomic_read(&queue->free_count));
out:
return;
return &q->sbal[sbal_idx]->element[sbale_idx];
}
/**
* zfcp_qdio_reqid_check - checks for valid reqids.
* 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)
{
struct qdio_buffer **sbal_req, **sbal_resp;
int p;
if (adapter->ccw_device)
qdio_free(adapter->ccw_device);
sbal_req = adapter->req_q.sbal;
sbal_resp = adapter->resp_q.sbal;
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]);
}
}
static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, u8 id)
{
dev_warn(&adapter->ccw_device->dev, "QDIO problem occurred.\n");
zfcp_erp_adapter_reopen(adapter,
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
}
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_adapter *) parm;
struct zfcp_qdio_queue *queue = &adapter->req_q;
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->sbal, first, count);
atomic_add(count, &queue->count);
wake_up(&adapter->request_wq);
}
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;
struct zfcp_qdio_queue *queue = &adapter->resp_q;
struct ccw_device *cdev = adapter->ccw_device;
u8 count, start = queue->first;
unsigned int retval;
adapter = (struct zfcp_adapter *) int_parm;
queue = &adapter->response_queue;
count = atomic_read(&queue->count) + processed;
if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error,
siga_error, first_element,
elements_processed)))
goto out;
retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
0, start, count, NULL);
/*
* we stored address of struct zfcp_adapter data structure
* associated with irq in int_parm
*/
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)
zfcp_qdio_sbale_req(struct zfcp_fsf_req *req)
{
return zfcp_qdio_sbale_get(&fsf_req->adapter->request_queue,
sbal, sbale);
return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, 0);
}
/**
* 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)
{
return zfcp_qdio_sbale_get(&fsf_req->adapter->response_queue,
sbal, sbale);
}
/**
* 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 - 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);
}
/**
* zfcp_qdio_determine_pci - set PCI flag in first SBALE on qdio queue if needed
*/
int
zfcp_qdio_determine_pci(struct zfcp_qdio_queue *req_queue,
struct zfcp_fsf_req *fsf_req)
{
int new_distance_from_int;
int pci_pos;
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;
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);
/* 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;
}
return new_distance_from_int;
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;
}
/*
* function: zfcp_zero_sbals
*
* purpose: zeros specified range of SBALs
*
* returns:
/* 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_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
*/
void
zfcp_qdio_zero_sbals(struct qdio_buffer *buf[], int first, int clean_count)
void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int count)
{
int cur_pos;
int index;
int i, sbal_idx;
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]);
for (i = first; i < first + count; i++) {
sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
}
}
#undef ZFCP_LOG_AREA
/**
* 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_close(struct zfcp_adapter *adapter)
{
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);
}
/**
* 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;
}