From: Swen Schillig <swen@xxxxxxxxxxxx>
Some definitions and structures in the zfcp QDIO processing are
improved by the removal of not required variables and processing steps.
I addition the naming of some variables is changed to make their purpose
more clear.
Signed-off-by: Swen Schillig <swen@xxxxxxxxxxxx>
Signed-off-by: Christof Schmitt <christof.schmitt@xxxxxxxxxx>
---
drivers/s390/scsi/zfcp_fsf.c | 10 +-
drivers/s390/scsi/zfcp_qdio.c | 141 ++++++++++++++----------------------------
drivers/s390/scsi/zfcp_qdio.h | 57 +++++-----------
3 files changed, 69 insertions(+), 139 deletions(-)
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -732,7 +732,7 @@ static int zfcp_fsf_req_send(struct zfcp
zfcp_reqlist_add(adapter->req_list, req);
- req->qdio_req.qdio_outb_usage = atomic_read(&qdio->req_q.count);
+ req->qdio_req.qdio_outb_usage = atomic_read(&qdio->req_q_free);
req->issued = get_clock();
if (zfcp_qdio_send(qdio, &req->qdio_req)) {
del_timer(&req->timer);
@@ -2025,7 +2025,7 @@ static void zfcp_fsf_req_trace(struct zf
blktrc.magic = ZFCP_BLK_DRV_DATA_MAGIC;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
blktrc.flags |= ZFCP_BLK_REQ_ERROR;
- blktrc.inb_usage = req->qdio_req.qdio_inb_usage;
+ blktrc.inb_usage = 0;
blktrc.outb_usage = req->qdio_req.qdio_outb_usage;
if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA &&
@@ -2207,7 +2207,7 @@ int zfcp_fsf_send_fcp_command_task(struc
return -EBUSY;
spin_lock(&qdio->req_q_lock);
- if (atomic_read(&qdio->req_q.count) <= 0) {
+ if (atomic_read(&qdio->req_q_free) <= 0) {
atomic_inc(&qdio->req_q_full);
goto out;
}
@@ -2407,7 +2407,7 @@ out:
void zfcp_fsf_reqid_check(struct zfcp_qdio *qdio, int sbal_idx)
{
struct zfcp_adapter *adapter = qdio->adapter;
- struct qdio_buffer *sbal = qdio->resp_q.sbal[sbal_idx];
+ struct qdio_buffer *sbal = qdio->res_q[sbal_idx];
struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
unsigned long req_id;
@@ -2428,8 +2428,6 @@ void zfcp_fsf_reqid_check(struct zfcp_qd
req_id, dev_name(&adapter->ccw_device->dev));
fsf_req->qdio_req.sbal_response = sbal_idx;
- fsf_req->qdio_req.qdio_inb_usage =
- atomic_read(&qdio->resp_q.count);
zfcp_fsf_req_complete(fsf_req);
if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY))
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -55,71 +55,46 @@ static void zfcp_qdio_zero_sbals(struct
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_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
zfcp_qdio_handler_error(qdio, "qdireq1");
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_dbf_hba_qdio(qdio->adapter->dbf, qdio_err, idx, count);
zfcp_qdio_handler_error(qdio, "qdires1");
return;
}
@@ -129,16 +104,16 @@ static void zfcp_qdio_int_resp(struct cc
* 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);
+ 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 *
@@ -185,17 +160,6 @@ zfcp_qdio_sbale_next(struct zfcp_qdio *q
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
@@ -218,7 +182,8 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_
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;
}
@@ -237,10 +202,8 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_
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);
@@ -289,25 +252,25 @@ int zfcp_qdio_sbal_get(struct zfcp_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;
}
@@ -329,8 +292,8 @@ static void zfcp_qdio_setup_init_data(st
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);
}
/**
@@ -343,8 +306,8 @@ static int zfcp_qdio_allocate(struct zfc
{
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);
@@ -358,34 +321,30 @@ static int zfcp_qdio_allocate(struct zfc
*/
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);
wake_up(&qdio->req_q_wq);
- qdio_shutdown(qdio->adapter->ccw_device,
- QDIO_FLAG_CLEANUP_USING_CLEAR);
+ 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);
}
/**
@@ -397,10 +356,11 @@ int zfcp_qdio_open(struct zfcp_qdio *qdi
{
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;
int cc;
- if (atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
+ if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)
return -EIO;
zfcp_qdio_setup_init_data(&init_data, qdio);
@@ -412,19 +372,18 @@ int zfcp_qdio_open(struct zfcp_qdio *qdi
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;
@@ -438,7 +397,6 @@ failed_establish:
void zfcp_qdio_destroy(struct zfcp_qdio *qdio)
{
- struct qdio_buffer **sbal_req, **sbal_resp;
int p;
if (!qdio)
@@ -447,12 +405,9 @@ void zfcp_qdio_destroy(struct zfcp_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);
--- a/drivers/s390/scsi/zfcp_qdio.h
+++ b/drivers/s390/scsi/zfcp_qdio.h
@@ -28,21 +28,11 @@
(ZFCP_QDIO_MAX_SBALS_PER_REQ * ZFCP_QDIO_MAX_SBALES_PER_SBAL - 2)
/**
- * struct zfcp_qdio_queue - qdio queue buffer, zfcp index and free count
- * @sbal: qdio buffers
- * @first: index of next free buffer in queue
- * @count: number of free buffers in queue
- */
-struct zfcp_qdio_queue {
- struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
- u8 first;
- atomic_t count;
-};
-
-/**
* struct zfcp_qdio - basic qdio data structure
- * @resp_q: response queue
+ * @res_q: response queue
* @req_q: request queue
+ * @req_q_idx: index of next free buffer
+ * @req_q_free: number of free buffers in queue
* @stat_lock: lock to protect req_q_util and req_q_time
* @req_q_lock: lock to serialize access to request queue
* @req_q_time: time of last fill level change
@@ -52,8 +42,10 @@ struct zfcp_qdio_queue {
* @adapter: adapter used in conjunction with this qdio structure
*/
struct zfcp_qdio {
- struct zfcp_qdio_queue resp_q;
- struct zfcp_qdio_queue req_q;
+ struct qdio_buffer *res_q[QDIO_MAX_BUFFERS_PER_Q];
+ struct qdio_buffer *req_q[QDIO_MAX_BUFFERS_PER_Q];
+ u8 req_q_idx;
+ atomic_t req_q_free;
spinlock_t stat_lock;
spinlock_t req_q_lock;
unsigned long long req_q_time;
@@ -73,7 +65,6 @@ struct zfcp_qdio {
* @sbale_curr: current sbale at creation of this request
* @sbal_response: sbal used in interrupt
* @qdio_outb_usage: usage of outbound queue
- * @qdio_inb_usage: usage of inbound queue
*/
struct zfcp_qdio_req {
u32 sbtype;
@@ -84,22 +75,9 @@ struct zfcp_qdio_req {
u8 sbale_curr;
u8 sbal_response;
u16 qdio_outb_usage;
- u16 qdio_inb_usage;
};
/**
- * zfcp_qdio_sbale - return pointer to sbale in qdio queue
- * @q: queue where to find sbal
- * @sbal_idx: sbal index in queue
- * @sbale_idx: sbale index in sbal
- */
-static inline struct qdio_buffer_element *
-zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
-{
- return &q->sbal[sbal_idx]->element[sbale_idx];
-}
-
-/**
* zfcp_qdio_sbale_req - return pointer to sbale on req_q for a request
* @qdio: pointer to struct zfcp_qdio
* @q_rec: pointer to struct zfcp_qdio_req
@@ -108,7 +86,7 @@ zfcp_qdio_sbale(struct zfcp_qdio_queue *
static inline struct qdio_buffer_element *
zfcp_qdio_sbale_req(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
- return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last, 0);
+ return &qdio->req_q[q_req->sbal_last]->element[0];
}
/**
@@ -120,8 +98,7 @@ zfcp_qdio_sbale_req(struct zfcp_qdio *qd
static inline struct qdio_buffer_element *
zfcp_qdio_sbale_curr(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
- return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last,
- q_req->sbale_curr);
+ return &qdio->req_q[q_req->sbal_last]->element[q_req->sbale_curr];
}
/**
@@ -142,25 +119,25 @@ void zfcp_qdio_req_init(struct zfcp_qdio
unsigned long req_id, u32 sbtype, void *data, u32 len)
{
struct qdio_buffer_element *sbale;
- int count = min(atomic_read(&qdio->req_q.count),
+ int count = min(atomic_read(&qdio->req_q_free),
ZFCP_QDIO_MAX_SBALS_PER_REQ);
- q_req->sbal_first = q_req->sbal_last = qdio->req_q.first;
+ q_req->sbal_first = q_req->sbal_last = qdio->req_q_idx;
q_req->sbal_number = 1;
q_req->sbtype = sbtype;
+ q_req->sbale_curr = 1;
q_req->sbal_limit = (q_req->sbal_first + count - 1)
% QDIO_MAX_BUFFERS_PER_Q;
sbale = zfcp_qdio_sbale_req(qdio, q_req);
sbale->addr = (void *) req_id;
- sbale->flags |= SBAL_FLAGS0_COMMAND;
- sbale->flags |= sbtype;
+ sbale->flags = SBAL_FLAGS0_COMMAND | sbtype;
- q_req->sbale_curr = 1;
+ if (unlikely(!data))
+ return;
sbale++;
sbale->addr = data;
- if (likely(data))
- sbale->length = len;
+ sbale->length = len;
}
/**
@@ -232,7 +209,7 @@ static inline
void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio,
struct zfcp_qdio_req *q_req, int max_sbals)
{
- int count = min(atomic_read(&qdio->req_q.count), max_sbals);
+ int count = min(atomic_read(&qdio->req_q_free), max_sbals);
q_req->sbal_limit = (q_req->sbal_first + count - 1) %
QDIO_MAX_BUFFERS_PER_Q;
--
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