[SCSI] zfcp: Cleanup of code in zfcp_scsi.c
[linux-2.6] / drivers / s390 / scsi / zfcp_scsi.c
1 /*
2  * zfcp device driver
3  *
4  * Interface to Linux SCSI midlayer.
5  *
6  * Copyright IBM Corporation 2002, 2008
7  */
8
9 #include "zfcp_ext.h"
10 #include <asm/atomic.h>
11
12 /* Find start of Sense Information in FCP response unit*/
13 char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
14 {
15         char *fcp_sns_info_ptr;
16
17         fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
18         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
19                 fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;
20
21         return fcp_sns_info_ptr;
22 }
23
24 void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
25 {
26         fcp_dl_t *fcp_dl_ptr;
27
28         /*
29          * fcp_dl_addr = start address of fcp_cmnd structure +
30          * size of fixed part + size of dynamically sized add_dcp_cdb field
31          * SEE FCP-2 documentation
32          */
33         fcp_dl_ptr = (fcp_dl_t *) ((unsigned char *) &fcp_cmd[1] +
34                                    (fcp_cmd->add_fcp_cdb_length << 2));
35         *fcp_dl_ptr = fcp_dl;
36 }
37
38 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
39 {
40         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
41         WARN_ON(!unit);
42         if (unit) {
43                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
44                 sdpnt->hostdata = NULL;
45                 unit->device = NULL;
46                 zfcp_erp_unit_failed(unit, 12, NULL);
47                 zfcp_unit_put(unit);
48         }
49 }
50
51 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
52 {
53         if (sdp->tagged_supported)
54                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
55         else
56                 scsi_adjust_queue_depth(sdp, 0, 1);
57         return 0;
58 }
59
60 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
61 {
62         set_host_byte(scpnt, result);
63         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
64                 zfcp_scsi_dbf_event_result("fail", 4,
65                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
66                         scpnt, NULL);
67         /* return directly */
68         scpnt->scsi_done(scpnt);
69 }
70
71 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
72                                   void (*done) (struct scsi_cmnd *))
73 {
74         struct zfcp_unit *unit;
75         struct zfcp_adapter *adapter;
76         int    status;
77         int    ret;
78
79         /* reset the status for this request */
80         scpnt->result = 0;
81         scpnt->host_scribble = NULL;
82         scpnt->scsi_done = done;
83
84         /*
85          * figure out adapter and target device
86          * (stored there by zfcp_scsi_slave_alloc)
87          */
88         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
89         unit = scpnt->device->hostdata;
90
91         BUG_ON(!adapter || (adapter != unit->port->adapter));
92         BUG_ON(!scpnt->scsi_done);
93
94         if (unlikely(!unit)) {
95                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
96                 return 0;
97         }
98
99         status = atomic_read(&unit->status);
100         if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
101                      !(status & ZFCP_STATUS_COMMON_RUNNING))) {
102                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
103                 return 0;;
104         }
105
106         ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
107                                              ZFCP_REQ_AUTO_CLEANUP);
108         if (unlikely(ret == -EBUSY))
109                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
110         else if (unlikely(ret < 0))
111                 return SCSI_MLQUEUE_HOST_BUSY;
112
113         return ret;
114 }
115
116 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
117                                           int channel, unsigned int id,
118                                           unsigned int lun)
119 {
120         struct zfcp_port *port;
121         struct zfcp_unit *unit;
122
123         list_for_each_entry(port, &adapter->port_list_head, list) {
124                 if (!port->rport || (id != port->rport->scsi_target_id))
125                         continue;
126                 list_for_each_entry(unit, &port->unit_list_head, list)
127                         if (lun == unit->scsi_lun)
128                                 return unit;
129         }
130
131         return NULL;
132 }
133
134 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
135 {
136         struct zfcp_adapter *adapter;
137         struct zfcp_unit *unit;
138         unsigned long flags;
139         int retval = -ENXIO;
140
141         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
142         if (!adapter)
143                 goto out;
144
145         read_lock_irqsave(&zfcp_data.config_lock, flags);
146         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
147         if (unit &&
148             (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_REGISTERED)) {
149                 sdp->hostdata = unit;
150                 unit->device = sdp;
151                 zfcp_unit_get(unit);
152                 retval = 0;
153         }
154         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
155 out:
156         return retval;
157 }
158
159 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
160 {
161         struct Scsi_Host *scsi_host;
162         struct zfcp_adapter *adapter;
163         struct zfcp_unit *unit;
164         struct zfcp_fsf_req *fsf_req;
165         unsigned long flags;
166         unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
167         int retval = SUCCESS;
168
169         scsi_host = scpnt->device->host;
170         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
171         unit = scpnt->device->hostdata;
172
173         /* avoid race condition between late normal completion and abort */
174         write_lock_irqsave(&adapter->abort_lock, flags);
175
176         /* Check whether corresponding fsf_req is still pending */
177         spin_lock(&adapter->req_list_lock);
178         fsf_req = zfcp_reqlist_find(adapter, old_req_id);
179         spin_unlock(&adapter->req_list_lock);
180         if (!fsf_req) {
181                 write_unlock_irqrestore(&adapter->abort_lock, flags);
182                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
183                 return retval;
184         }
185         fsf_req->data = 0;
186         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
187
188         /* don't access old fsf_req after releasing the abort_lock */
189         write_unlock_irqrestore(&adapter->abort_lock, flags);
190
191         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
192         if (!fsf_req) {
193                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
194                                           old_req_id);
195                 retval = FAILED;
196                 return retval;
197         }
198
199         __wait_event(fsf_req->completion_wq,
200                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
201
202         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
203                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
204         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
205                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
206         } else {
207                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
208                 retval = FAILED;
209         }
210         zfcp_fsf_req_free(fsf_req);
211
212         return retval;
213 }
214
215 static int zfcp_task_mgmt_function(struct zfcp_unit *unit, u8 tm_flags,
216                                          struct scsi_cmnd *scpnt)
217 {
218         struct zfcp_adapter *adapter = unit->port->adapter;
219         struct zfcp_fsf_req *fsf_req;
220         int retval = SUCCESS;
221
222         /* issue task management function */
223         fsf_req = zfcp_fsf_send_fcp_command_task_management
224                 (adapter, unit, tm_flags, 0);
225         if (!fsf_req) {
226                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
227                 return FAILED;
228         }
229
230         __wait_event(fsf_req->completion_wq,
231                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
232
233         /*
234          * check completion status of task management function
235          */
236         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
237                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
238                 retval = FAILED;
239         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
240                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
241                 retval = FAILED;
242         } else
243                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
244
245         zfcp_fsf_req_free(fsf_req);
246
247         return retval;
248 }
249
250 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
251 {
252         struct zfcp_unit *unit = scpnt->device->hostdata;
253
254         if (!unit) {
255                 WARN_ON(1);
256                 return SUCCESS;
257         }
258         return zfcp_task_mgmt_function(unit, FCP_LOGICAL_UNIT_RESET, scpnt);
259 }
260
261 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
262 {
263         struct zfcp_unit *unit = scpnt->device->hostdata;
264
265         if (!unit) {
266                 WARN_ON(1);
267                 return SUCCESS;
268         }
269         return zfcp_task_mgmt_function(unit, FCP_TARGET_RESET, scpnt);
270 }
271
272 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
273 {
274         struct zfcp_unit *unit;
275         struct zfcp_adapter *adapter;
276
277         unit = scpnt->device->hostdata;
278         adapter = unit->port->adapter;
279         zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
280         zfcp_erp_wait(adapter);
281
282         return SUCCESS;
283 }
284
285 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
286 {
287         struct ccw_dev_id dev_id;
288
289         if (adapter->scsi_host)
290                 return 0;
291
292         ccw_device_get_id(adapter->ccw_device, &dev_id);
293         /* register adapter as SCSI host with mid layer of SCSI stack */
294         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
295                                              sizeof (struct zfcp_adapter *));
296         if (!adapter->scsi_host) {
297                 dev_err(&adapter->ccw_device->dev,
298                         "registration with SCSI stack failed.");
299                 return -EIO;
300         }
301
302         /* tell the SCSI stack some characteristics of this adapter */
303         adapter->scsi_host->max_id = 1;
304         adapter->scsi_host->max_lun = 1;
305         adapter->scsi_host->max_channel = 0;
306         adapter->scsi_host->unique_id = dev_id.devno;
307         adapter->scsi_host->max_cmd_len = 255;
308         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
309
310         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
311
312         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
313                 scsi_host_put(adapter->scsi_host);
314                 return -EIO;
315         }
316         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
317
318         return 0;
319 }
320
321 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
322 {
323         struct Scsi_Host *shost;
324         struct zfcp_port *port;
325
326         shost = adapter->scsi_host;
327         if (!shost)
328                 return;
329
330         read_lock_irq(&zfcp_data.config_lock);
331         list_for_each_entry(port, &adapter->port_list_head, list)
332                 if (port->rport)
333                         port->rport = NULL;
334
335         read_unlock_irq(&zfcp_data.config_lock);
336         fc_remove_host(shost);
337         scsi_remove_host(shost);
338         scsi_host_put(shost);
339         adapter->scsi_host = NULL;
340         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
341
342         return;
343 }
344
345 static struct fc_host_statistics*
346 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
347 {
348         struct fc_host_statistics *fc_stats;
349
350         if (!adapter->fc_stats) {
351                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
352                 if (!fc_stats)
353                         return NULL;
354                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
355         }
356         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
357         return adapter->fc_stats;
358 }
359
360 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
361                                       struct fsf_qtcb_bottom_port *data,
362                                       struct fsf_qtcb_bottom_port *old)
363 {
364         fc_stats->seconds_since_last_reset =
365                 data->seconds_since_last_reset - old->seconds_since_last_reset;
366         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
367         fc_stats->tx_words = data->tx_words - old->tx_words;
368         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
369         fc_stats->rx_words = data->rx_words - old->rx_words;
370         fc_stats->lip_count = data->lip - old->lip;
371         fc_stats->nos_count = data->nos - old->nos;
372         fc_stats->error_frames = data->error_frames - old->error_frames;
373         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
374         fc_stats->link_failure_count = data->link_failure - old->link_failure;
375         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
376         fc_stats->loss_of_signal_count =
377                 data->loss_of_signal - old->loss_of_signal;
378         fc_stats->prim_seq_protocol_err_count =
379                 data->psp_error_counts - old->psp_error_counts;
380         fc_stats->invalid_tx_word_count =
381                 data->invalid_tx_words - old->invalid_tx_words;
382         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
383         fc_stats->fcp_input_requests =
384                 data->input_requests - old->input_requests;
385         fc_stats->fcp_output_requests =
386                 data->output_requests - old->output_requests;
387         fc_stats->fcp_control_requests =
388                 data->control_requests - old->control_requests;
389         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
390         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
391 }
392
393 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
394                                    struct fsf_qtcb_bottom_port *data)
395 {
396         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
397         fc_stats->tx_frames = data->tx_frames;
398         fc_stats->tx_words = data->tx_words;
399         fc_stats->rx_frames = data->rx_frames;
400         fc_stats->rx_words = data->rx_words;
401         fc_stats->lip_count = data->lip;
402         fc_stats->nos_count = data->nos;
403         fc_stats->error_frames = data->error_frames;
404         fc_stats->dumped_frames = data->dumped_frames;
405         fc_stats->link_failure_count = data->link_failure;
406         fc_stats->loss_of_sync_count = data->loss_of_sync;
407         fc_stats->loss_of_signal_count = data->loss_of_signal;
408         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
409         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
410         fc_stats->invalid_crc_count = data->invalid_crcs;
411         fc_stats->fcp_input_requests = data->input_requests;
412         fc_stats->fcp_output_requests = data->output_requests;
413         fc_stats->fcp_control_requests = data->control_requests;
414         fc_stats->fcp_input_megabytes = data->input_mb;
415         fc_stats->fcp_output_megabytes = data->output_mb;
416 }
417
418 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
419 {
420         struct zfcp_adapter *adapter;
421         struct fc_host_statistics *fc_stats;
422         struct fsf_qtcb_bottom_port *data;
423         int ret;
424
425         adapter = (struct zfcp_adapter *)host->hostdata[0];
426         fc_stats = zfcp_init_fc_host_stats(adapter);
427         if (!fc_stats)
428                 return NULL;
429
430         data = kzalloc(sizeof(*data), GFP_KERNEL);
431         if (!data)
432                 return NULL;
433
434         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
435         if (ret) {
436                 kfree(data);
437                 return NULL;
438         }
439
440         if (adapter->stats_reset &&
441             ((jiffies/HZ - adapter->stats_reset) <
442              data->seconds_since_last_reset))
443                 zfcp_adjust_fc_host_stats(fc_stats, data,
444                                           adapter->stats_reset_data);
445         else
446                 zfcp_set_fc_host_stats(fc_stats, data);
447
448         kfree(data);
449         return fc_stats;
450 }
451
452 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
453 {
454         struct zfcp_adapter *adapter;
455         struct fsf_qtcb_bottom_port *data;
456         int ret;
457
458         adapter = (struct zfcp_adapter *)shost->hostdata[0];
459         data = kzalloc(sizeof(*data), GFP_KERNEL);
460         if (!data)
461                 return;
462
463         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
464         if (ret)
465                 kfree(data);
466         else {
467                 adapter->stats_reset = jiffies/HZ;
468                 kfree(adapter->stats_reset_data);
469                 adapter->stats_reset_data = data; /* finally freed in
470                                                      adapter_dequeue */
471         }
472 }
473
474 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
475 {
476         struct zfcp_adapter *adapter =
477                 (struct zfcp_adapter *)shost->hostdata[0];
478         int status = atomic_read(&adapter->status);
479
480         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
481             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
482                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
483         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
484                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
485         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
486                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
487         else
488                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
489 }
490
491 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
492 {
493         rport->dev_loss_tmo = timeout;
494 }
495
496 struct fc_function_template zfcp_transport_functions = {
497         .show_starget_port_id = 1,
498         .show_starget_port_name = 1,
499         .show_starget_node_name = 1,
500         .show_rport_supported_classes = 1,
501         .show_rport_maxframe_size = 1,
502         .show_rport_dev_loss_tmo = 1,
503         .show_host_node_name = 1,
504         .show_host_port_name = 1,
505         .show_host_permanent_port_name = 1,
506         .show_host_supported_classes = 1,
507         .show_host_supported_speeds = 1,
508         .show_host_maxframe_size = 1,
509         .show_host_serial_number = 1,
510         .get_fc_host_stats = zfcp_get_fc_host_stats,
511         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
512         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
513         .get_host_port_state = zfcp_get_host_port_state,
514         .show_host_port_state = 1,
515         /* no functions registered for following dynamic attributes but
516            directly set by LLDD */
517         .show_host_port_type = 1,
518         .show_host_speed = 1,
519         .show_host_port_id = 1,
520         .disable_target_scan = 1,
521 };
522
523 #define ZFCP_DEFINE_LATENCY_ATTR(_name)                                 \
524 static ssize_t                                                          \
525 zfcp_sysfs_unit_##_name##_latency_show(struct device *dev,              \
526                                        struct device_attribute *attr,   \
527                                        char *buf) {                     \
528         struct scsi_device *sdev = to_scsi_device(dev);                 \
529         struct zfcp_unit *unit = sdev->hostdata;                        \
530         struct zfcp_latencies *lat = &unit->latencies;                  \
531         struct zfcp_adapter *adapter = unit->port->adapter;             \
532         unsigned long flags;                                            \
533         unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc;      \
534                                                                         \
535         spin_lock_irqsave(&lat->lock, flags);                           \
536         fsum = lat->_name.fabric.sum * adapter->timer_ticks;            \
537         fmin = lat->_name.fabric.min * adapter->timer_ticks;            \
538         fmax = lat->_name.fabric.max * adapter->timer_ticks;            \
539         csum = lat->_name.channel.sum * adapter->timer_ticks;           \
540         cmin = lat->_name.channel.min * adapter->timer_ticks;           \
541         cmax = lat->_name.channel.max * adapter->timer_ticks;           \
542         cc  = lat->_name.counter;                                       \
543         spin_unlock_irqrestore(&lat->lock, flags);                      \
544                                                                         \
545         do_div(fsum, 1000);                                             \
546         do_div(fmin, 1000);                                             \
547         do_div(fmax, 1000);                                             \
548         do_div(csum, 1000);                                             \
549         do_div(cmin, 1000);                                             \
550         do_div(cmax, 1000);                                             \
551                                                                         \
552         return sprintf(buf, "%llu %llu %llu %llu %llu %llu %llu\n",     \
553                        fmin, fmax, fsum, cmin, cmax, csum, cc);         \
554 }                                                                       \
555 static ssize_t                                                          \
556 zfcp_sysfs_unit_##_name##_latency_store(struct device *dev,             \
557                                         struct device_attribute *attr,  \
558                                         const char *buf, size_t count)  \
559 {                                                                       \
560         struct scsi_device *sdev = to_scsi_device(dev);                 \
561         struct zfcp_unit *unit = sdev->hostdata;                        \
562         struct zfcp_latencies *lat = &unit->latencies;                  \
563         unsigned long flags;                                            \
564                                                                         \
565         spin_lock_irqsave(&lat->lock, flags);                           \
566         lat->_name.fabric.sum = 0;                                      \
567         lat->_name.fabric.min = 0xFFFFFFFF;                             \
568         lat->_name.fabric.max = 0;                                      \
569         lat->_name.channel.sum = 0;                                     \
570         lat->_name.channel.min = 0xFFFFFFFF;                            \
571         lat->_name.channel.max = 0;                                     \
572         lat->_name.counter = 0;                                         \
573         spin_unlock_irqrestore(&lat->lock, flags);                      \
574                                                                         \
575         return (ssize_t) count;                                         \
576 }                                                                       \
577 static DEVICE_ATTR(_name##_latency, S_IWUSR | S_IRUGO,                  \
578                    zfcp_sysfs_unit_##_name##_latency_show,              \
579                    zfcp_sysfs_unit_##_name##_latency_store);
580
581 ZFCP_DEFINE_LATENCY_ATTR(read);
582 ZFCP_DEFINE_LATENCY_ATTR(write);
583 ZFCP_DEFINE_LATENCY_ATTR(cmd);
584
585 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
586 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
587                                               char *buf)                 \
588 {                                                                        \
589         struct scsi_device *sdev;                                        \
590         struct zfcp_unit *unit;                                          \
591                                                                          \
592         sdev = to_scsi_device(dev);                                      \
593         unit = sdev->hostdata;                                           \
594         return sprintf(buf, _format, _value);                            \
595 }                                                                        \
596                                                                          \
597 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
598
599 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n",
600         unit->port->adapter->ccw_device->dev.bus_id);
601 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
602 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
603
604 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
605         &dev_attr_fcp_lun,
606         &dev_attr_wwpn,
607         &dev_attr_hba_id,
608         &dev_attr_read_latency,
609         &dev_attr_write_latency,
610         &dev_attr_cmd_latency,
611         NULL
612 };
613
614 static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
615                                             struct device_attribute *attr,
616                                             char *buf)
617 {
618         struct Scsi_Host *scsi_host = dev_to_shost(dev);
619         struct fsf_qtcb_bottom_port *qtcb_port;
620         struct zfcp_adapter *adapter;
621         int retval;
622
623         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
624         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
625                 return -EOPNOTSUPP;
626
627         qtcb_port = kzalloc(sizeof(struct fsf_qtcb_bottom_port), GFP_KERNEL);
628         if (!qtcb_port)
629                 return -ENOMEM;
630
631         retval = zfcp_fsf_exchange_port_data_sync(adapter, qtcb_port);
632         if (!retval)
633                 retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util,
634                                  qtcb_port->cb_util, qtcb_port->a_util);
635         kfree(qtcb_port);
636         return retval;
637 }
638
639 static int zfcp_sysfs_adapter_ex_config(struct device *dev,
640                                         struct fsf_statistics_info *stat_inf)
641 {
642         struct Scsi_Host *scsi_host = dev_to_shost(dev);
643         struct fsf_qtcb_bottom_config *qtcb_config;
644         struct zfcp_adapter *adapter;
645         int retval;
646
647         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
648         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
649                 return -EOPNOTSUPP;
650
651         qtcb_config = kzalloc(sizeof(struct fsf_qtcb_bottom_config),
652                               GFP_KERNEL);
653         if (!qtcb_config)
654                 return -ENOMEM;
655
656         retval = zfcp_fsf_exchange_config_data_sync(adapter, qtcb_config);
657         if (!retval)
658                 *stat_inf = qtcb_config->stat_info;
659
660         kfree(qtcb_config);
661         return retval;
662 }
663
664 static ssize_t zfcp_sysfs_adapter_request_show(struct device *dev,
665                                                struct device_attribute *attr,
666                                                char *buf)
667 {
668         struct fsf_statistics_info stat_info;
669         int retval;
670
671         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
672         if (retval)
673                 return retval;
674
675         return sprintf(buf, "%llu %llu %llu\n",
676                        (unsigned long long) stat_info.input_req,
677                        (unsigned long long) stat_info.output_req,
678                        (unsigned long long) stat_info.control_req);
679 }
680
681 static ssize_t zfcp_sysfs_adapter_mb_show(struct device *dev,
682                                           struct device_attribute *attr,
683                                           char *buf)
684 {
685         struct fsf_statistics_info stat_info;
686         int retval;
687
688         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
689         if (retval)
690                 return retval;
691
692         return sprintf(buf, "%llu %llu\n",
693                        (unsigned long long) stat_info.input_mb,
694                        (unsigned long long) stat_info.output_mb);
695 }
696
697 static ssize_t zfcp_sysfs_adapter_sec_active_show(struct device *dev,
698                                                   struct device_attribute *attr,
699                                                   char *buf)
700 {
701         struct fsf_statistics_info stat_info;
702         int retval;
703
704         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);
705         if (retval)
706                 return retval;
707
708         return sprintf(buf, "%llu\n",
709                        (unsigned long long) stat_info.seconds_act);
710 }
711
712 static DEVICE_ATTR(utilization, S_IRUGO, zfcp_sysfs_adapter_util_show, NULL);
713 static DEVICE_ATTR(requests, S_IRUGO, zfcp_sysfs_adapter_request_show, NULL);
714 static DEVICE_ATTR(megabytes, S_IRUGO, zfcp_sysfs_adapter_mb_show, NULL);
715 static DEVICE_ATTR(seconds_active, S_IRUGO,
716                    zfcp_sysfs_adapter_sec_active_show, NULL);
717
718 static struct device_attribute *zfcp_a_stats_attrs[] = {
719         &dev_attr_utilization,
720         &dev_attr_requests,
721         &dev_attr_megabytes,
722         &dev_attr_seconds_active,
723         NULL
724 };
725
726 struct zfcp_data zfcp_data = {
727         .scsi_host_template = {
728                 .name                    = "zfcp",
729                 .module                  = THIS_MODULE,
730                 .proc_name               = "zfcp",
731                 .slave_alloc             = zfcp_scsi_slave_alloc,
732                 .slave_configure         = zfcp_scsi_slave_configure,
733                 .slave_destroy           = zfcp_scsi_slave_destroy,
734                 .queuecommand            = zfcp_scsi_queuecommand,
735                 .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
736                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
737                 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
738                 .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
739                 .can_queue               = 4096,
740                 .this_id                 = -1,
741                 .sg_tablesize            = ZFCP_MAX_SBALES_PER_REQ,
742                 .cmd_per_lun             = 1,
743                 .use_clustering          = 1,
744                 .sdev_attrs              = zfcp_sysfs_sdev_attrs,
745                 .max_sectors             = (ZFCP_MAX_SBALES_PER_REQ * 8),
746                 .shost_attrs             = zfcp_a_stats_attrs,
747         },
748 };
749