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path: root/drivers/s390/scsi/zfcp_qdio.c
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Diffstat (limited to 'drivers/s390/scsi/zfcp_qdio.c')
-rw-r--r--drivers/s390/scsi/zfcp_qdio.c214
1 files changed, 100 insertions, 114 deletions
diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index 28117e130e2c..b2635759721c 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -30,12 +30,15 @@ static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
return 0;
}
-static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id)
+static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id,
+ unsigned int qdio_err)
{
struct zfcp_adapter *adapter = qdio->adapter;
dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
+ if (qdio_err & QDIO_ERROR_SLSB_STATE)
+ zfcp_qdio_siosl(adapter);
zfcp_erp_adapter_reopen(adapter,
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
@@ -55,72 +58,47 @@ static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
static inline void zfcp_qdio_account(struct zfcp_qdio *qdio)
{
unsigned long long now, span;
- int free, used;
+ int used;
spin_lock(&qdio->stat_lock);
now = get_clock_monotonic();
span = (now - qdio->req_q_time) >> 12;
- free = atomic_read(&qdio->req_q.count);
- used = QDIO_MAX_BUFFERS_PER_Q - free;
+ used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free);
qdio->req_q_util += used * span;
qdio->req_q_time = now;
spin_unlock(&qdio->stat_lock);
}
static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
- int queue_no, int first, int count,
+ int queue_no, int idx, int count,
unsigned long parm)
{
struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
- struct zfcp_qdio_queue *queue = &qdio->req_q;
if (unlikely(qdio_err)) {
- zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, first,
- count);
- zfcp_qdio_handler_error(qdio, "qdireq1");
+ zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
+ zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err);
return;
}
/* cleanup all SBALs being program-owned now */
- zfcp_qdio_zero_sbals(queue->sbal, first, count);
+ zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
zfcp_qdio_account(qdio);
- atomic_add(count, &queue->count);
+ atomic_add(count, &qdio->req_q_free);
wake_up(&qdio->req_q_wq);
}
-static void zfcp_qdio_resp_put_back(struct zfcp_qdio *qdio, int processed)
-{
- struct zfcp_qdio_queue *queue = &qdio->resp_q;
- struct ccw_device *cdev = qdio->adapter->ccw_device;
- u8 count, start = queue->first;
- unsigned int retval;
-
- count = atomic_read(&queue->count) + processed;
-
- retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count);
-
- if (unlikely(retval)) {
- atomic_set(&queue->count, count);
- zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdrpb_1", NULL);
- } 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 qdio_err,
- int queue_no, int first, int count,
+ int queue_no, int idx, int count,
unsigned long parm)
{
struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
int sbal_idx, sbal_no;
if (unlikely(qdio_err)) {
- zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, first,
- count);
- zfcp_qdio_handler_error(qdio, "qdires1");
+ zfcp_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
+ zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
return;
}
@@ -129,25 +107,16 @@ static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
* returned by QDIO layer
*/
for (sbal_no = 0; sbal_no < count; sbal_no++) {
- sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
+ sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
/* go through all SBALEs of SBAL */
zfcp_fsf_reqid_check(qdio, sbal_idx);
}
/*
- * put range of SBALs back to response queue
- * (including SBALs which have already been free before)
+ * put SBALs back to response queue
*/
- zfcp_qdio_resp_put_back(qdio, count);
-}
-
-static void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio,
- struct zfcp_qdio_req *q_req, int max_sbals)
-{
- int count = atomic_read(&qdio->req_q.count);
- count = min(count, max_sbals);
- q_req->sbal_limit = (q_req->sbal_first + count - 1)
- % QDIO_MAX_BUFFERS_PER_Q;
+ if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count))
+ zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2", NULL);
}
static struct qdio_buffer_element *
@@ -173,6 +142,7 @@ zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
/* keep this requests number of SBALs up-to-date */
q_req->sbal_number++;
+ BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
/* start at first SBALE of new SBAL */
q_req->sbale_curr = 0;
@@ -193,17 +163,6 @@ zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
return zfcp_qdio_sbale_curr(qdio, q_req);
}
-static void zfcp_qdio_undo_sbals(struct zfcp_qdio *qdio,
- struct zfcp_qdio_req *q_req)
-{
- struct qdio_buffer **sbal = qdio->req_q.sbal;
- int first = q_req->sbal_first;
- int last = q_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_from_sg - fill SBALs from scatter-gather list
* @qdio: pointer to struct zfcp_qdio
@@ -213,14 +172,11 @@ static void zfcp_qdio_undo_sbals(struct zfcp_qdio *qdio,
* Returns: number of bytes, or error (negativ)
*/
int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
- struct scatterlist *sg, int max_sbals)
+ struct scatterlist *sg)
{
struct qdio_buffer_element *sbale;
int bytes = 0;
- /* figure out last allowed SBAL */
- zfcp_qdio_sbal_limit(qdio, q_req, max_sbals);
-
/* set storage-block type for this request */
sbale = zfcp_qdio_sbale_req(qdio, q_req);
sbale->flags |= q_req->sbtype;
@@ -229,7 +185,8 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
sbale = zfcp_qdio_sbale_next(qdio, q_req);
if (!sbale) {
atomic_inc(&qdio->req_q_full);
- zfcp_qdio_undo_sbals(qdio, q_req);
+ zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
+ q_req->sbal_number);
return -EINVAL;
}
@@ -239,19 +196,14 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
bytes += sg->length;
}
- /* assume that no other SBALEs are to follow in the same SBAL */
- sbale = zfcp_qdio_sbale_curr(qdio, q_req);
- sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
-
return bytes;
}
static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
{
- struct zfcp_qdio_queue *req_q = &qdio->req_q;
-
spin_lock_bh(&qdio->req_q_lock);
- if (atomic_read(&req_q->count))
+ if (atomic_read(&qdio->req_q_free) ||
+ !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
return 1;
spin_unlock_bh(&qdio->req_q_lock);
return 0;
@@ -274,8 +226,13 @@ int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
spin_unlock_bh(&qdio->req_q_lock);
ret = wait_event_interruptible_timeout(qdio->req_q_wq,
zfcp_qdio_sbal_check(qdio), 5 * HZ);
+
+ if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
+ return -EIO;
+
if (ret > 0)
return 0;
+
if (!ret) {
atomic_inc(&qdio->req_q_full);
/* assume hanging outbound queue, try queue recovery */
@@ -294,25 +251,25 @@ int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio)
*/
int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
- struct zfcp_qdio_queue *req_q = &qdio->req_q;
- int first = q_req->sbal_first;
- int count = q_req->sbal_number;
int retval;
- unsigned int qdio_flags = QDIO_FLAG_SYNC_OUTPUT;
+ u8 sbal_number = q_req->sbal_number;
zfcp_qdio_account(qdio);
- retval = do_QDIO(qdio->adapter->ccw_device, qdio_flags, 0, first,
- count);
+ retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0,
+ q_req->sbal_first, sbal_number);
+
if (unlikely(retval)) {
- zfcp_qdio_zero_sbals(req_q->sbal, first, count);
+ zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first,
+ sbal_number);
return retval;
}
/* account for transferred buffers */
- atomic_sub(count, &req_q->count);
- req_q->first += count;
- req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
+ atomic_sub(sbal_number, &qdio->req_q_free);
+ qdio->req_q_idx += sbal_number;
+ qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q;
+
return 0;
}
@@ -325,6 +282,7 @@ static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
id->q_format = QDIO_ZFCP_QFMT;
memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
ASCEBC(id->adapter_name, 8);
+ id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
id->qib_param_field_format = 0;
id->qib_param_field = NULL;
id->input_slib_elements = NULL;
@@ -334,10 +292,10 @@ static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
id->input_handler = zfcp_qdio_int_resp;
id->output_handler = zfcp_qdio_int_req;
id->int_parm = (unsigned long) qdio;
- id->input_sbal_addr_array = (void **) (qdio->resp_q.sbal);
- id->output_sbal_addr_array = (void **) (qdio->req_q.sbal);
-
+ id->input_sbal_addr_array = (void **) (qdio->res_q);
+ id->output_sbal_addr_array = (void **) (qdio->req_q);
}
+
/**
* zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
* @adapter: pointer to struct zfcp_adapter
@@ -348,8 +306,8 @@ static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
{
struct qdio_initialize init_data;
- if (zfcp_qdio_buffers_enqueue(qdio->req_q.sbal) ||
- zfcp_qdio_buffers_enqueue(qdio->resp_q.sbal))
+ if (zfcp_qdio_buffers_enqueue(qdio->req_q) ||
+ zfcp_qdio_buffers_enqueue(qdio->res_q))
return -ENOMEM;
zfcp_qdio_setup_init_data(&init_data, qdio);
@@ -363,32 +321,30 @@ static int zfcp_qdio_allocate(struct zfcp_qdio *qdio)
*/
void zfcp_qdio_close(struct zfcp_qdio *qdio)
{
- struct zfcp_qdio_queue *req_q;
- int first, count;
+ struct zfcp_adapter *adapter = qdio->adapter;
+ int idx, count;
- if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
+ if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP))
return;
/* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
- req_q = &qdio->req_q;
spin_lock_bh(&qdio->req_q_lock);
- atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
+ atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
spin_unlock_bh(&qdio->req_q_lock);
- qdio_shutdown(qdio->adapter->ccw_device,
- QDIO_FLAG_CLEANUP_USING_CLEAR);
+ wake_up(&qdio->req_q_wq);
+
+ qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
/* cleanup used outbound sbals */
- count = atomic_read(&req_q->count);
+ count = atomic_read(&qdio->req_q_free);
if (count < QDIO_MAX_BUFFERS_PER_Q) {
- first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q;
+ idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q;
count = QDIO_MAX_BUFFERS_PER_Q - count;
- zfcp_qdio_zero_sbals(req_q->sbal, first, count);
+ zfcp_qdio_zero_sbals(qdio->req_q, idx, count);
}
- req_q->first = 0;
- atomic_set(&req_q->count, 0);
- qdio->resp_q.first = 0;
- atomic_set(&qdio->resp_q.count, 0);
+ qdio->req_q_idx = 0;
+ atomic_set(&qdio->req_q_free, 0);
}
/**
@@ -400,34 +356,45 @@ int zfcp_qdio_open(struct zfcp_qdio *qdio)
{
struct qdio_buffer_element *sbale;
struct qdio_initialize init_data;
- struct ccw_device *cdev = qdio->adapter->ccw_device;
+ struct zfcp_adapter *adapter = qdio->adapter;
+ struct ccw_device *cdev = adapter->ccw_device;
+ struct qdio_ssqd_desc ssqd;
int cc;
- if (atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
+ if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
return -EIO;
+ atomic_clear_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
+ &qdio->adapter->status);
+
zfcp_qdio_setup_init_data(&init_data, qdio);
if (qdio_establish(&init_data))
goto failed_establish;
+ if (qdio_get_ssqd_desc(init_data.cdev, &ssqd))
+ goto failed_qdio;
+
+ if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED)
+ atomic_set_mask(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
+ &qdio->adapter->status);
+
if (qdio_activate(cdev))
goto failed_qdio;
for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
- sbale = &(qdio->resp_q.sbal[cc]->element[0]);
+ sbale = &(qdio->res_q[cc]->element[0]);
sbale->length = 0;
sbale->flags = SBAL_FLAGS_LAST_ENTRY;
sbale->addr = NULL;
}
- if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0,
- QDIO_MAX_BUFFERS_PER_Q))
+ if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q))
goto failed_qdio;
/* set index of first avalable SBALS / number of available SBALS */
- qdio->req_q.first = 0;
- atomic_set(&qdio->req_q.count, QDIO_MAX_BUFFERS_PER_Q);
+ qdio->req_q_idx = 0;
+ atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
return 0;
@@ -441,7 +408,6 @@ failed_establish:
void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
{
- struct qdio_buffer **sbal_req, **sbal_resp;
int p;
if (!qdio)
@@ -450,12 +416,9 @@ void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
if (qdio->adapter->ccw_device)
qdio_free(qdio->adapter->ccw_device);
- sbal_req = qdio->req_q.sbal;
- sbal_resp = qdio->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]);
+ free_page((unsigned long) qdio->req_q[p]);
+ free_page((unsigned long) qdio->res_q[p]);
}
kfree(qdio);
@@ -483,3 +446,26 @@ int zfcp_qdio_setup(struct zfcp_adapter *adapter)
return 0;
}
+/**
+ * zfcp_qdio_siosl - Trigger logging in FCP channel
+ * @adapter: The zfcp_adapter where to trigger logging
+ *
+ * Call the cio siosl function to trigger hardware logging. This
+ * wrapper function sets a flag to ensure hardware logging is only
+ * triggered once before going through qdio shutdown.
+ *
+ * The triggers are always run from qdio tasklet context, so no
+ * additional synchronization is necessary.
+ */
+void zfcp_qdio_siosl(struct zfcp_adapter *adapter)
+{
+ int rc;
+
+ if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED)
+ return;
+
+ rc = ccw_device_siosl(adapter->ccw_device);
+ if (!rc)
+ atomic_set_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED,
+ &adapter->status);
+}