redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity

[SCSI] zfcp: Cleanup QDIO attachment and improve processing.

Browse source 
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@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Swen Schillig 2010-07-16 15:37:38 +02:00 committed by James Bottomley
parent 01b047599a
commit 706eca49a0
3 changed files with 69 additions and 139 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/s390/scsi/zfcp_fsf.c
View file

@ -732,7 +732,7 @@ static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
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 zfcp_fsf_req *req, struct scsi_cmnd *scsi)
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(struct zfcp_unit *unit,
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_qdio *qdio, int sbal_idx)
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))

141
drivers/s390/scsi/zfcp_qdio.c
View file

@ -55,71 +55,46 @@ 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_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 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);
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 *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
@ -218,7 +182,8 @@ 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;
}
@ -237,10 +202,8 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
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 *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(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);
}
/**
@ -343,8 +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);
@ -358,34 +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);
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 *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;
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 *qdio)
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 *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);

57
drivers/s390/scsi/zfcp_qdio.h
View file

@ -27,22 +27,12 @@
#define ZFCP_QDIO_MAX_SBALES_PER_REQ \
(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;
@ -84,21 +75,8 @@ 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
@ -108,7 +86,7 @@ zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
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 *qdio, struct zfcp_qdio_req *q_req)
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 *qdio, struct zfcp_qdio_req *q_req,
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;