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[SCSI] zfcp: Introduce header file for qdio structs and inline functions 

Move the qdio related structs and some helper functions to a new
zfcp_qdio.h header file. While doing this, rename the struct
zfcp_queue_req to zfcp_qdio_req to adhere to the naming scheme used in
zfcp. This allows a better seperation of the qdio code and inlining
the helper functions will save some function calls.

Reviewed-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:
Christof Schmitt 2010-02-17 11:18:59 +01:00 committed by James Bottomley
parent 2d8e62bbf7
commit 34c2b71299
6 changed files with 162 additions and 137 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/s390/scsi/zfcp_dbf.c
View File

@ -140,9 +140,9 @@ void _zfcp_dbf_hba_fsf_response(const char *tag2, int level,
memcpy(response->fsf_status_qual,
fsf_status_qual, FSF_STATUS_QUALIFIER_SIZE);
response->fsf_req_status = fsf_req->status;
response->sbal_first = fsf_req->queue_req.sbal_first;
response->sbal_last = fsf_req->queue_req.sbal_last;
response->sbal_response = fsf_req->queue_req.sbal_response;
response->sbal_first = fsf_req->qdio_req.sbal_first;
response->sbal_last = fsf_req->qdio_req.sbal_last;
response->sbal_response = fsf_req->qdio_req.sbal_response;
response->pool = fsf_req->pool != NULL;
response->erp_action = (unsigned long)fsf_req->erp_action;

57
drivers/s390/scsi/zfcp_def.h
View File

@ -33,11 +33,11 @@
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_bsg_fc.h>
#include <asm/ccwdev.h>
#include <asm/qdio.h>
#include <asm/debug.h>
#include <asm/ebcdic.h>
#include <asm/sysinfo.h>
#include "zfcp_fsf.h"
#include "zfcp_qdio.h"
struct zfcp_reqlist;
@ -127,12 +127,6 @@ struct zfcp_adapter_mempool {
mempool_t *qtcb_pool;
};
struct zfcp_qdio_queue {
struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
u8 first; /* index of next free bfr in queue */
atomic_t count; /* number of free buffers in queue */
};
struct zfcp_erp_action {
struct list_head list;
int action; /* requested action code */
@ -164,29 +158,6 @@ struct zfcp_latencies {
spinlock_t lock;
};
/** struct zfcp_qdio - basic QDIO data structure
* @resp_q: response queue
* @req_q: request 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
* @req_q_util: used for accounting
* @req_q_full: queue full incidents
* @req_q_wq: used to wait for SBAL availability
* @adapter: adapter used in conjunction with this QDIO structure
*/
struct zfcp_qdio {
struct zfcp_qdio_queue resp_q;
struct zfcp_qdio_queue req_q;
spinlock_t stat_lock;
spinlock_t req_q_lock;
unsigned long long req_q_time;
u64 req_q_util;
atomic_t req_q_full;
wait_queue_head_t req_q_wq;
struct zfcp_adapter *adapter;
};
struct zfcp_adapter {
struct kref ref;
u64 peer_wwnn; /* P2P peer WWNN */
@ -272,34 +243,12 @@ struct zfcp_unit {
struct work_struct scsi_work;
};
/**
* struct zfcp_queue_req - queue related values for a request
* @sbal_number: number of free SBALs
* @sbal_first: first SBAL for this request
* @sbal_last: last SBAL for this request
* @sbal_limit: last possible SBAL for this request
* @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_queue_req {
u8 sbal_number;
u8 sbal_first;
u8 sbal_last;
u8 sbal_limit;
u8 sbale_curr;
u8 sbal_response;
u16 qdio_outb_usage;
u16 qdio_inb_usage;
};
/**
* struct zfcp_fsf_req - basic FSF request structure
* @list: list of FSF requests
* @req_id: unique request ID
* @adapter: adapter this request belongs to
* @queue_req: queue related values
* @qdio_req: qdio queue related values
* @completion: used to signal the completion of the request
* @status: status of the request
* @fsf_command: FSF command issued
@ -317,7 +266,7 @@ struct zfcp_fsf_req {
struct list_head list;
unsigned long req_id;
struct zfcp_adapter *adapter;
struct zfcp_queue_req queue_req;
struct zfcp_qdio_req qdio_req;
struct completion completion;
u32 status;
u32 fsf_command;

8
drivers/s390/scsi/zfcp_ext.h
View File

@ -143,13 +143,9 @@ extern void zfcp_fsf_reqid_check(struct zfcp_qdio *, int);
/* zfcp_qdio.c */
extern int zfcp_qdio_setup(struct zfcp_adapter *);
extern void zfcp_qdio_destroy(struct zfcp_qdio *);
extern int zfcp_qdio_send(struct zfcp_qdio *, struct zfcp_queue_req *);
extern struct qdio_buffer_element
*zfcp_qdio_sbale_req(struct zfcp_qdio *, struct zfcp_queue_req *);
extern struct qdio_buffer_element
*zfcp_qdio_sbale_curr(struct zfcp_qdio *, struct zfcp_queue_req *);
extern int zfcp_qdio_send(struct zfcp_qdio *, struct zfcp_qdio_req *);
extern int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *,
struct zfcp_queue_req *, unsigned long,
struct zfcp_qdio_req *, unsigned long,
struct scatterlist *, int);
extern int zfcp_qdio_open(struct zfcp_qdio *);
extern void zfcp_qdio_close(struct zfcp_qdio *);

71
drivers/s390/scsi/zfcp_fsf.c
View File

@ -14,6 +14,7 @@
#include "zfcp_ext.h"
#include "zfcp_fc.h"
#include "zfcp_dbf.h"
#include "zfcp_qdio.h"
#include "zfcp_reqlist.h"
static void zfcp_fsf_request_timeout_handler(unsigned long data)
@ -723,12 +724,12 @@ static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_qdio *qdio,
req->adapter = adapter;
req->fsf_command = fsf_cmd;
req->req_id = adapter->req_no;
req->queue_req.sbal_number = 1;
req->queue_req.sbal_first = req_q->first;
req->queue_req.sbal_last = req_q->first;
req->queue_req.sbale_curr = 1;
req->qdio_req.sbal_number = 1;
req->qdio_req.sbal_first = req_q->first;
req->qdio_req.sbal_last = req_q->first;
req->qdio_req.sbale_curr = 1;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].addr = (void *) req->req_id;
sbale[0].flags |= SBAL_FLAGS0_COMMAND;
@ -772,9 +773,9 @@ static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
zfcp_reqlist_add(adapter->req_list, req);
req->queue_req.qdio_outb_usage = atomic_read(&qdio->req_q.count);
req->qdio_req.qdio_outb_usage = atomic_read(&qdio->req_q.count);
req->issued = get_clock();
if (zfcp_qdio_send(qdio, &req->queue_req)) {
if (zfcp_qdio_send(qdio, &req->qdio_req)) {
del_timer(&req->timer);
/* lookup request again, list might have changed */
zfcp_reqlist_find_rm(adapter->req_list, req_id);
@ -815,9 +816,9 @@ int zfcp_fsf_status_read(struct zfcp_qdio *qdio)
goto out;
}
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
req->queue_req.sbale_curr = 2;
req->qdio_req.sbale_curr = 2;
sr_buf = mempool_alloc(adapter->pool.status_read_data, GFP_ATOMIC);
if (!sr_buf) {
@ -826,7 +827,7 @@ int zfcp_fsf_status_read(struct zfcp_qdio *qdio)
}
memset(sr_buf, 0, sizeof(*sr_buf));
req->data = sr_buf;
sbale = zfcp_qdio_sbale_curr(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_curr(qdio, &req->qdio_req);
sbale->addr = (void *) sr_buf;
sbale->length = sizeof(*sr_buf);
@ -923,7 +924,7 @@ struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
ZFCP_STATUS_COMMON_UNBLOCKED)))
goto out_error_free;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1018,7 +1019,7 @@ static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
{
struct zfcp_adapter *adapter = req->adapter;
struct qdio_buffer_element *sbale = zfcp_qdio_sbale_req(adapter->qdio,
&req->queue_req);
&req->qdio_req);
u32 feat = adapter->adapter_features;
int bytes;
@ -1036,15 +1037,15 @@ static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
return 0;
}
bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->queue_req,
bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->qdio_req,
SBAL_FLAGS0_TYPE_WRITE_READ,
sg_req, max_sbals);
if (bytes <= 0)
return -EIO;
req->qtcb->bottom.support.req_buf_length = bytes;
req->queue_req.sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
req->qdio_req.sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->queue_req,
bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->qdio_req,
SBAL_FLAGS0_TYPE_WRITE_READ,
sg_resp, max_sbals);
req->qtcb->bottom.support.resp_buf_length = bytes;
@ -1240,7 +1241,7 @@ int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1282,7 +1283,7 @@ int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
goto out_unlock;
}
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
req->handler = zfcp_fsf_exchange_config_data_handler;
@ -1338,7 +1339,7 @@ int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1387,7 +1388,7 @@ int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio,
if (data)
req->data = data;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1502,7 +1503,7 @@ int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1572,7 +1573,7 @@ int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1649,7 +1650,7 @@ int zfcp_fsf_open_wka_port(struct zfcp_fc_wka_port *wka_port)
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1704,7 +1705,7 @@ int zfcp_fsf_close_wka_port(struct zfcp_fc_wka_port *wka_port)
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1798,7 +1799,7 @@ int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -1971,7 +1972,7 @@ int zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -2057,7 +2058,7 @@ int zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -2100,8 +2101,8 @@ 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->queue_req.qdio_inb_usage;
blktrc.outb_usage = req->queue_req.qdio_outb_usage;
blktrc.inb_usage = req->qdio_req.qdio_inb_usage;
blktrc.outb_usage = req->qdio_req.qdio_outb_usage;
if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
blktrc.flags |= ZFCP_BLK_LAT_VALID;
@ -2330,11 +2331,11 @@ int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
fcp_cmnd = (struct fcp_cmnd *) &req->qtcb->bottom.io.fcp_cmnd;
zfcp_fc_scsi_to_fcp(fcp_cmnd, scsi_cmnd);
real_bytes = zfcp_qdio_sbals_from_sg(qdio, &req->queue_req, sbtype,
real_bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sbtype,
scsi_sglist(scsi_cmnd),
FSF_MAX_SBALS_PER_REQ);
if (unlikely(real_bytes < 0)) {
if (req->queue_req.sbal_number >= FSF_MAX_SBALS_PER_REQ) {
if (req->qdio_req.sbal_number >= FSF_MAX_SBALS_PER_REQ) {
dev_err(&adapter->ccw_device->dev,
"Oversize data package, unit 0x%016Lx "
"on port 0x%016Lx closed\n",
@ -2399,7 +2400,7 @@ struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_unit *unit, u8 tm_flags)
req->qtcb->bottom.io.service_class = FSF_CLASS_3;
req->qtcb->bottom.io.fcp_cmnd_length = FCP_CMND_LEN;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@ -2462,14 +2463,14 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
req->handler = zfcp_fsf_control_file_handler;
sbale = zfcp_qdio_sbale_req(qdio, &req->queue_req);
sbale = zfcp_qdio_sbale_req(qdio, &req->qdio_req);
sbale[0].flags |= direction;
bottom = &req->qtcb->bottom.support;
bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
bottom->option = fsf_cfdc->option;
bytes = zfcp_qdio_sbals_from_sg(qdio, &req->queue_req,
bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
direction, fsf_cfdc->sg,
FSF_MAX_SBALS_PER_REQ);
if (bytes != ZFCP_CFDC_MAX_SIZE) {
@ -2517,8 +2518,8 @@ void zfcp_fsf_reqid_check(struct zfcp_qdio *qdio, int sbal_idx)
panic("error: unknown req_id (%lx) on adapter %s.\n",
req_id, dev_name(&adapter->ccw_device->dev));
fsf_req->queue_req.sbal_response = sbal_idx;
fsf_req->queue_req.qdio_inb_usage =
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);

48
drivers/s390/scsi/zfcp_qdio.c
View File

@ -10,6 +10,7 @@
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include "zfcp_ext.h"
#include "zfcp_qdio.h"
#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
@ -28,12 +29,6 @@ static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
return 0;
}
static 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];
}
static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id)
{
struct zfcp_adapter *adapter = qdio->adapter;
@ -145,32 +140,8 @@ static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
zfcp_qdio_resp_put_back(qdio, count);
}
/**
* zfcp_qdio_sbale_req - return ptr to SBALE of req_q for a struct zfcp_fsf_req
* @qdio: pointer to struct zfcp_qdio
* @q_rec: pointer to struct zfcp_queue_rec
* Returns: pointer to qdio_buffer_element (SBALE) structure
*/
struct qdio_buffer_element *zfcp_qdio_sbale_req(struct zfcp_qdio *qdio,
struct zfcp_queue_req *q_req)
{
return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last, 0);
}
/**
* 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
*/
struct qdio_buffer_element *zfcp_qdio_sbale_curr(struct zfcp_qdio *qdio,
struct zfcp_queue_req *q_req)
{
return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last,
q_req->sbale_curr);
}
static void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio,
struct zfcp_queue_req *q_req, int max_sbals)
struct zfcp_qdio_req *q_req, int max_sbals)
{
int count = atomic_read(&qdio->req_q.count);
count = min(count, max_sbals);
@ -179,7 +150,7 @@ static void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio,
}
static struct qdio_buffer_element *
zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_queue_req *q_req,
zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
unsigned long sbtype)
{
struct qdio_buffer_element *sbale;
@ -214,7 +185,7 @@ zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_queue_req *q_req,
}
static struct qdio_buffer_element *
zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_queue_req *q_req,
zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
unsigned int sbtype)
{
if (q_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL)
@ -224,7 +195,7 @@ zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_queue_req *q_req,
}
static void zfcp_qdio_undo_sbals(struct zfcp_qdio *qdio,
struct zfcp_queue_req *q_req)
struct zfcp_qdio_req *q_req)
{
struct qdio_buffer **sbal = qdio->req_q.sbal;
int first = q_req->sbal_first;
@ -235,7 +206,7 @@ static void zfcp_qdio_undo_sbals(struct zfcp_qdio *qdio,
}
static int zfcp_qdio_fill_sbals(struct zfcp_qdio *qdio,
struct zfcp_queue_req *q_req,
struct zfcp_qdio_req *q_req,
unsigned int sbtype, void *start_addr,
unsigned int total_length)
{
@ -271,8 +242,7 @@ static int zfcp_qdio_fill_sbals(struct zfcp_qdio *qdio,
* @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_qdio *qdio,
struct zfcp_queue_req *q_req,
int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
unsigned long sbtype, struct scatterlist *sg,
int max_sbals)
{
@ -304,10 +274,10 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio,
/**
* zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
* @qdio: pointer to struct zfcp_qdio
* @q_req: pointer to struct zfcp_queue_req
* @q_req: pointer to struct zfcp_qdio_req
* Returns: 0 on success, error otherwise
*/
int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_queue_req *q_req)
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;

109
drivers/s390/scsi/zfcp_qdio.h Normal file
View File

@ -0,0 +1,109 @@
/*
* zfcp device driver
*
* Header file for zfcp qdio interface
*
* Copyright IBM Corporation 2010
*/
#ifndef ZFCP_QDIO_H
#define ZFCP_QDIO_H
#include <asm/qdio.h>
/**
* 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
* @req_q: request 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
* @req_q_util: used for accounting
* @req_q_full: queue full incidents
* @req_q_wq: used to wait for SBAL availability
* @adapter: adapter used in conjunction with this qdio structure
*/
struct zfcp_qdio {
struct zfcp_qdio_queue resp_q;
struct zfcp_qdio_queue req_q;
spinlock_t stat_lock;
spinlock_t req_q_lock;
unsigned long long req_q_time;
u64 req_q_util;
atomic_t req_q_full;
wait_queue_head_t req_q_wq;
struct zfcp_adapter *adapter;
};
/**
* struct zfcp_qdio_req - qdio queue related values for a request
* @sbal_number: number of free sbals
* @sbal_first: first sbal for this request
* @sbal_last: last sbal for this request
* @sbal_limit: last possible sbal for this request
* @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 {
u8 sbal_number;
u8 sbal_first;
u8 sbal_last;
u8 sbal_limit;
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
* Returns: pointer to qdio_buffer_element (sbale) structure
*/
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);
}
/**
* zfcp_qdio_sbale_curr - return current sbale on req_q for a request
* @qdio: pointer to struct zfcp_qdio
* @fsf_req: pointer to struct zfcp_fsf_req
* Returns: pointer to qdio_buffer_element (sbale) structure
*/
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);
}
#endif /* ZFCP_QDIO_H */