[SCSI] zfcp: Simplify latency lock handling
[linux-2.6.git] / drivers / s390 / scsi / zfcp_sysfs.c
1 /*
2  * zfcp device driver
3  *
4  * sysfs attributes.
5  *
6  * Copyright IBM Corporation 2008
7  */
8
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include "zfcp_ext.h"
13
14 #define ZFCP_DEV_ATTR(_feat, _name, _mode, _show, _store) \
15 struct device_attribute dev_attr_##_feat##_##_name = __ATTR(_name, _mode,\
16                                                             _show, _store)
17 #define ZFCP_DEFINE_ATTR(_feat_def, _feat, _name, _format, _value)             \
18 static ssize_t zfcp_sysfs_##_feat##_##_name##_show(struct device *dev,         \
19                                                    struct device_attribute *at,\
20                                                    char *buf)                  \
21 {                                                                              \
22         struct _feat_def *_feat = dev_get_drvdata(dev);                        \
23                                                                                \
24         return sprintf(buf, _format, _value);                                  \
25 }                                                                              \
26 static ZFCP_DEV_ATTR(_feat, _name, S_IRUGO,                                    \
27                      zfcp_sysfs_##_feat##_##_name##_show, NULL);
28
29 ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, status, "0x%08x\n",
30                  atomic_read(&adapter->status));
31 ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, peer_wwnn, "0x%016llx\n",
32                  (unsigned long long) adapter->peer_wwnn);
33 ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, peer_wwpn, "0x%016llx\n",
34                  (unsigned long long) adapter->peer_wwpn);
35 ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, peer_d_id, "0x%06x\n",
36                  adapter->peer_d_id);
37 ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, card_version, "0x%04x\n",
38                  adapter->hydra_version);
39 ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, lic_version, "0x%08x\n",
40                  adapter->fsf_lic_version);
41 ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, hardware_version, "0x%08x\n",
42                  adapter->hardware_version);
43 ZFCP_DEFINE_ATTR(zfcp_adapter, adapter, in_recovery, "%d\n",
44                  (atomic_read(&adapter->status) &
45                   ZFCP_STATUS_COMMON_ERP_INUSE) != 0);
46
47 ZFCP_DEFINE_ATTR(zfcp_port, port, status, "0x%08x\n",
48                  atomic_read(&port->status));
49 ZFCP_DEFINE_ATTR(zfcp_port, port, in_recovery, "%d\n",
50                  (atomic_read(&port->status) &
51                   ZFCP_STATUS_COMMON_ERP_INUSE) != 0);
52 ZFCP_DEFINE_ATTR(zfcp_port, port, access_denied, "%d\n",
53                  (atomic_read(&port->status) &
54                   ZFCP_STATUS_COMMON_ACCESS_DENIED) != 0);
55
56 ZFCP_DEFINE_ATTR(zfcp_unit, unit, status, "0x%08x\n",
57                  atomic_read(&unit->status));
58 ZFCP_DEFINE_ATTR(zfcp_unit, unit, in_recovery, "%d\n",
59                  (atomic_read(&unit->status) &
60                   ZFCP_STATUS_COMMON_ERP_INUSE) != 0);
61 ZFCP_DEFINE_ATTR(zfcp_unit, unit, access_denied, "%d\n",
62                  (atomic_read(&unit->status) &
63                   ZFCP_STATUS_COMMON_ACCESS_DENIED) != 0);
64 ZFCP_DEFINE_ATTR(zfcp_unit, unit, access_shared, "%d\n",
65                  (atomic_read(&unit->status) &
66                   ZFCP_STATUS_UNIT_SHARED) != 0);
67 ZFCP_DEFINE_ATTR(zfcp_unit, unit, access_readonly, "%d\n",
68                  (atomic_read(&unit->status) &
69                   ZFCP_STATUS_UNIT_READONLY) != 0);
70
71 #define ZFCP_SYSFS_FAILED(_feat_def, _feat, _adapter, _mod_id, _reopen_id)     \
72 static ssize_t zfcp_sysfs_##_feat##_failed_show(struct device *dev,            \
73                                                 struct device_attribute *attr, \
74                                                 char *buf)                     \
75 {                                                                              \
76         struct _feat_def *_feat = dev_get_drvdata(dev);                        \
77                                                                                \
78         if (atomic_read(&_feat->status) & ZFCP_STATUS_COMMON_ERP_FAILED)       \
79                 return sprintf(buf, "1\n");                                    \
80         else                                                                   \
81                 return sprintf(buf, "0\n");                                    \
82 }                                                                              \
83 static ssize_t zfcp_sysfs_##_feat##_failed_store(struct device *dev,           \
84                                                  struct device_attribute *attr,\
85                                                  const char *buf, size_t count)\
86 {                                                                              \
87         struct _feat_def *_feat = dev_get_drvdata(dev);                        \
88         unsigned long val;                                                     \
89         int retval = 0;                                                        \
90                                                                                \
91         down(&zfcp_data.config_sema);                                          \
92         if (atomic_read(&_feat->status) & ZFCP_STATUS_COMMON_REMOVE) {         \
93                 retval = -EBUSY;                                               \
94                 goto out;                                                      \
95         }                                                                      \
96                                                                                \
97         if (strict_strtoul(buf, 0, &val) || val != 0) {                        \
98                 retval = -EINVAL;                                              \
99                 goto out;                                                      \
100         }                                                                      \
101                                                                                \
102         zfcp_erp_modify_##_feat##_status(_feat, _mod_id, NULL,                 \
103                                          ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);\
104         zfcp_erp_##_feat##_reopen(_feat, ZFCP_STATUS_COMMON_ERP_FAILED,        \
105                                   _reopen_id, NULL);                           \
106         zfcp_erp_wait(_adapter);                                               \
107 out:                                                                           \
108         up(&zfcp_data.config_sema);                                            \
109         return retval ? retval : (ssize_t) count;                              \
110 }                                                                              \
111 static ZFCP_DEV_ATTR(_feat, failed, S_IWUSR | S_IRUGO,                         \
112                      zfcp_sysfs_##_feat##_failed_show,                         \
113                      zfcp_sysfs_##_feat##_failed_store);
114
115 ZFCP_SYSFS_FAILED(zfcp_adapter, adapter, adapter, 44, 93);
116 ZFCP_SYSFS_FAILED(zfcp_port, port, port->adapter, 45, 96);
117 ZFCP_SYSFS_FAILED(zfcp_unit, unit, unit->port->adapter, 46, 97);
118
119 static ssize_t zfcp_sysfs_port_rescan_store(struct device *dev,
120                                             struct device_attribute *attr,
121                                             const char *buf, size_t count)
122 {
123         struct zfcp_adapter *adapter = dev_get_drvdata(dev);
124         int ret;
125
126         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_REMOVE)
127                 return -EBUSY;
128
129         ret = zfcp_scan_ports(adapter);
130         return ret ? ret : (ssize_t) count;
131 }
132 static ZFCP_DEV_ATTR(adapter, port_rescan, S_IWUSR, NULL,
133                      zfcp_sysfs_port_rescan_store);
134
135 static ssize_t zfcp_sysfs_port_remove_store(struct device *dev,
136                                             struct device_attribute *attr,
137                                             const char *buf, size_t count)
138 {
139         struct zfcp_adapter *adapter = dev_get_drvdata(dev);
140         struct zfcp_port *port;
141         u64 wwpn;
142         int retval = 0;
143         LIST_HEAD(port_remove_lh);
144
145         down(&zfcp_data.config_sema);
146         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_REMOVE) {
147                 retval = -EBUSY;
148                 goto out;
149         }
150
151         if (strict_strtoull(buf, 0, (unsigned long long *) &wwpn)) {
152                 retval = -EINVAL;
153                 goto out;
154         }
155
156         write_lock_irq(&zfcp_data.config_lock);
157         port = zfcp_get_port_by_wwpn(adapter, wwpn);
158         if (port && (atomic_read(&port->refcount) == 0)) {
159                 zfcp_port_get(port);
160                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
161                 list_move(&port->list, &port_remove_lh);
162         } else
163                 port = NULL;
164         write_unlock_irq(&zfcp_data.config_lock);
165
166         if (!port) {
167                 retval = -ENXIO;
168                 goto out;
169         }
170
171         zfcp_erp_port_shutdown(port, 0, 92, NULL);
172         zfcp_erp_wait(adapter);
173         zfcp_port_put(port);
174         zfcp_port_dequeue(port);
175  out:
176         up(&zfcp_data.config_sema);
177         return retval ? retval : (ssize_t) count;
178 }
179 static ZFCP_DEV_ATTR(adapter, port_remove, S_IWUSR, NULL,
180                      zfcp_sysfs_port_remove_store);
181
182 static struct attribute *zfcp_adapter_attrs[] = {
183         &dev_attr_adapter_failed.attr,
184         &dev_attr_adapter_in_recovery.attr,
185         &dev_attr_adapter_port_remove.attr,
186         &dev_attr_adapter_port_rescan.attr,
187         &dev_attr_adapter_peer_wwnn.attr,
188         &dev_attr_adapter_peer_wwpn.attr,
189         &dev_attr_adapter_peer_d_id.attr,
190         &dev_attr_adapter_card_version.attr,
191         &dev_attr_adapter_lic_version.attr,
192         &dev_attr_adapter_status.attr,
193         &dev_attr_adapter_hardware_version.attr,
194         NULL
195 };
196
197 struct attribute_group zfcp_sysfs_adapter_attrs = {
198         .attrs = zfcp_adapter_attrs,
199 };
200
201 static ssize_t zfcp_sysfs_unit_add_store(struct device *dev,
202                                          struct device_attribute *attr,
203                                          const char *buf, size_t count)
204 {
205         struct zfcp_port *port = dev_get_drvdata(dev);
206         struct zfcp_unit *unit;
207         u64 fcp_lun;
208         int retval = -EINVAL;
209
210         down(&zfcp_data.config_sema);
211         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE) {
212                 retval = -EBUSY;
213                 goto out;
214         }
215
216         if (strict_strtoull(buf, 0, (unsigned long long *) &fcp_lun))
217                 goto out;
218
219         unit = zfcp_unit_enqueue(port, fcp_lun);
220         if (IS_ERR(unit))
221                 goto out;
222
223         retval = 0;
224
225         zfcp_erp_unit_reopen(unit, 0, 94, NULL);
226         zfcp_erp_wait(unit->port->adapter);
227         zfcp_unit_put(unit);
228 out:
229         up(&zfcp_data.config_sema);
230         return retval ? retval : (ssize_t) count;
231 }
232 static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
233
234 static ssize_t zfcp_sysfs_unit_remove_store(struct device *dev,
235                                             struct device_attribute *attr,
236                                             const char *buf, size_t count)
237 {
238         struct zfcp_port *port = dev_get_drvdata(dev);
239         struct zfcp_unit *unit;
240         u64 fcp_lun;
241         int retval = 0;
242         LIST_HEAD(unit_remove_lh);
243
244         down(&zfcp_data.config_sema);
245         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE) {
246                 retval = -EBUSY;
247                 goto out;
248         }
249
250         if (strict_strtoull(buf, 0, (unsigned long long *) &fcp_lun)) {
251                 retval = -EINVAL;
252                 goto out;
253         }
254
255         write_lock_irq(&zfcp_data.config_lock);
256         unit = zfcp_get_unit_by_lun(port, fcp_lun);
257         if (unit && (atomic_read(&unit->refcount) == 0)) {
258                 zfcp_unit_get(unit);
259                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
260                 list_move(&unit->list, &unit_remove_lh);
261         } else
262                 unit = NULL;
263
264         write_unlock_irq(&zfcp_data.config_lock);
265
266         if (!unit) {
267                 retval = -ENXIO;
268                 goto out;
269         }
270
271         zfcp_erp_unit_shutdown(unit, 0, 95, NULL);
272         zfcp_erp_wait(unit->port->adapter);
273         zfcp_unit_put(unit);
274         zfcp_unit_dequeue(unit);
275 out:
276         up(&zfcp_data.config_sema);
277         return retval ? retval : (ssize_t) count;
278 }
279 static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
280
281 static struct attribute *zfcp_port_attrs[] = {
282         &dev_attr_unit_add.attr,
283         &dev_attr_unit_remove.attr,
284         &dev_attr_port_failed.attr,
285         &dev_attr_port_in_recovery.attr,
286         &dev_attr_port_status.attr,
287         &dev_attr_port_access_denied.attr,
288         NULL
289 };
290
291 /**
292  * zfcp_sysfs_port_attrs - sysfs attributes for all other ports
293  */
294 struct attribute_group zfcp_sysfs_port_attrs = {
295         .attrs = zfcp_port_attrs,
296 };
297
298 static struct attribute *zfcp_unit_attrs[] = {
299         &dev_attr_unit_failed.attr,
300         &dev_attr_unit_in_recovery.attr,
301         &dev_attr_unit_status.attr,
302         &dev_attr_unit_access_denied.attr,
303         &dev_attr_unit_access_shared.attr,
304         &dev_attr_unit_access_readonly.attr,
305         NULL
306 };
307
308 struct attribute_group zfcp_sysfs_unit_attrs = {
309         .attrs = zfcp_unit_attrs,
310 };
311
312 #define ZFCP_DEFINE_LATENCY_ATTR(_name)                                 \
313 static ssize_t                                                          \
314 zfcp_sysfs_unit_##_name##_latency_show(struct device *dev,              \
315                                        struct device_attribute *attr,   \
316                                        char *buf) {                     \
317         struct scsi_device *sdev = to_scsi_device(dev);                 \
318         struct zfcp_unit *unit = sdev->hostdata;                        \
319         struct zfcp_latencies *lat = &unit->latencies;                  \
320         struct zfcp_adapter *adapter = unit->port->adapter;             \
321         unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc;      \
322                                                                         \
323         spin_lock_bh(&lat->lock);                                       \
324         fsum = lat->_name.fabric.sum * adapter->timer_ticks;            \
325         fmin = lat->_name.fabric.min * adapter->timer_ticks;            \
326         fmax = lat->_name.fabric.max * adapter->timer_ticks;            \
327         csum = lat->_name.channel.sum * adapter->timer_ticks;           \
328         cmin = lat->_name.channel.min * adapter->timer_ticks;           \
329         cmax = lat->_name.channel.max * adapter->timer_ticks;           \
330         cc  = lat->_name.counter;                                       \
331         spin_unlock_bh(&lat->lock);                                     \
332                                                                         \
333         do_div(fsum, 1000);                                             \
334         do_div(fmin, 1000);                                             \
335         do_div(fmax, 1000);                                             \
336         do_div(csum, 1000);                                             \
337         do_div(cmin, 1000);                                             \
338         do_div(cmax, 1000);                                             \
339                                                                         \
340         return sprintf(buf, "%llu %llu %llu %llu %llu %llu %llu\n",     \
341                        fmin, fmax, fsum, cmin, cmax, csum, cc);         \
342 }                                                                       \
343 static ssize_t                                                          \
344 zfcp_sysfs_unit_##_name##_latency_store(struct device *dev,             \
345                                         struct device_attribute *attr,  \
346                                         const char *buf, size_t count)  \
347 {                                                                       \
348         struct scsi_device *sdev = to_scsi_device(dev);                 \
349         struct zfcp_unit *unit = sdev->hostdata;                        \
350         struct zfcp_latencies *lat = &unit->latencies;                  \
351         unsigned long flags;                                            \
352                                                                         \
353         spin_lock_irqsave(&lat->lock, flags);                           \
354         lat->_name.fabric.sum = 0;                                      \
355         lat->_name.fabric.min = 0xFFFFFFFF;                             \
356         lat->_name.fabric.max = 0;                                      \
357         lat->_name.channel.sum = 0;                                     \
358         lat->_name.channel.min = 0xFFFFFFFF;                            \
359         lat->_name.channel.max = 0;                                     \
360         lat->_name.counter = 0;                                         \
361         spin_unlock_irqrestore(&lat->lock, flags);                      \
362                                                                         \
363         return (ssize_t) count;                                         \
364 }                                                                       \
365 static DEVICE_ATTR(_name##_latency, S_IWUSR | S_IRUGO,                  \
366                    zfcp_sysfs_unit_##_name##_latency_show,              \
367                    zfcp_sysfs_unit_##_name##_latency_store);
368
369 ZFCP_DEFINE_LATENCY_ATTR(read);
370 ZFCP_DEFINE_LATENCY_ATTR(write);
371 ZFCP_DEFINE_LATENCY_ATTR(cmd);
372
373 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                   \
374 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev,       \
375                                               struct device_attribute *attr,\
376                                               char *buf)                 \
377 {                                                                        \
378         struct scsi_device *sdev  = to_scsi_device(dev);                 \
379         struct zfcp_unit *unit = sdev->hostdata;                         \
380                                                                          \
381         return sprintf(buf, _format, _value);                            \
382 }                                                                        \
383 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
384
385 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n",
386                       dev_name(&unit->port->adapter->ccw_device->dev));
387 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n",
388                       (unsigned long long) unit->port->wwpn);
389 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n",
390                       (unsigned long long) unit->fcp_lun);
391
392 struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
393         &dev_attr_fcp_lun,
394         &dev_attr_wwpn,
395         &dev_attr_hba_id,
396         &dev_attr_read_latency,
397         &dev_attr_write_latency,
398         &dev_attr_cmd_latency,
399         NULL
400 };
401
402 static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
403                                             struct device_attribute *attr,
404                                             char *buf)
405 {
406         struct Scsi_Host *scsi_host = dev_to_shost(dev);
407         struct fsf_qtcb_bottom_port *qtcb_port;
408         struct zfcp_adapter *adapter;
409         int retval;
410
411         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
412         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
413                 return -EOPNOTSUPP;
414
415         qtcb_port = kzalloc(sizeof(struct fsf_qtcb_bottom_port), GFP_KERNEL);
416         if (!qtcb_port)
417                 return -ENOMEM;
418
419         retval = zfcp_fsf_exchange_port_data_sync(adapter, qtcb_port);
420         if (!retval)
421                 retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util,
422                                  qtcb_port->cb_util, qtcb_port->a_util);
423         kfree(qtcb_port);
424         return retval;
425 }
426 static DEVICE_ATTR(utilization, S_IRUGO, zfcp_sysfs_adapter_util_show, NULL);
427
428 static int zfcp_sysfs_adapter_ex_config(struct device *dev,
429                                         struct fsf_statistics_info *stat_inf)
430 {
431         struct Scsi_Host *scsi_host = dev_to_shost(dev);
432         struct fsf_qtcb_bottom_config *qtcb_config;
433         struct zfcp_adapter *adapter;
434         int retval;
435
436         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
437         if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
438                 return -EOPNOTSUPP;
439
440         qtcb_config = kzalloc(sizeof(struct fsf_qtcb_bottom_config),
441                               GFP_KERNEL);
442         if (!qtcb_config)
443                 return -ENOMEM;
444
445         retval = zfcp_fsf_exchange_config_data_sync(adapter, qtcb_config);
446         if (!retval)
447                 *stat_inf = qtcb_config->stat_info;
448
449         kfree(qtcb_config);
450         return retval;
451 }
452
453 #define ZFCP_SHOST_ATTR(_name, _format, _arg...)                        \
454 static ssize_t zfcp_sysfs_adapter_##_name##_show(struct device *dev,    \
455                                                  struct device_attribute *attr,\
456                                                  char *buf)             \
457 {                                                                       \
458         struct fsf_statistics_info stat_info;                           \
459         int retval;                                                     \
460                                                                         \
461         retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info);         \
462         if (retval)                                                     \
463                 return retval;                                          \
464                                                                         \
465         return sprintf(buf, _format, ## _arg);                          \
466 }                                                                       \
467 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_adapter_##_name##_show, NULL);
468
469 ZFCP_SHOST_ATTR(requests, "%llu %llu %llu\n",
470                 (unsigned long long) stat_info.input_req,
471                 (unsigned long long) stat_info.output_req,
472                 (unsigned long long) stat_info.control_req);
473
474 ZFCP_SHOST_ATTR(megabytes, "%llu %llu\n",
475                 (unsigned long long) stat_info.input_mb,
476                 (unsigned long long) stat_info.output_mb);
477
478 ZFCP_SHOST_ATTR(seconds_active, "%llu\n",
479                 (unsigned long long) stat_info.seconds_act);
480
481 static ssize_t zfcp_sysfs_adapter_q_full_show(struct device *dev,
482                                               struct device_attribute *attr,
483                                               char *buf)
484 {
485         struct Scsi_Host *scsi_host = class_to_shost(dev);
486         struct zfcp_adapter *adapter =
487                 (struct zfcp_adapter *) scsi_host->hostdata[0];
488
489         return sprintf(buf, "%d %llu\n", atomic_read(&adapter->qdio_outb_full),
490                        (unsigned long long)adapter->req_q_util);
491 }
492 static DEVICE_ATTR(queue_full, S_IRUGO, zfcp_sysfs_adapter_q_full_show, NULL);
493
494 struct device_attribute *zfcp_sysfs_shost_attrs[] = {
495         &dev_attr_utilization,
496         &dev_attr_requests,
497         &dev_attr_megabytes,
498         &dev_attr_seconds_active,
499         &dev_attr_queue_full,
500         NULL
501 };