aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/scsi/zfcp_scsi.c
blob: c17505f767a9c0b7efc0ca80c0b6a6cac31e72ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
/*
 * zfcp device driver
 *
 * Interface to Linux SCSI midlayer.
 *
 * Copyright IBM Corporation 2002, 2008
 */

#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include "zfcp_ext.h"
#include <asm/atomic.h>

/* Find start of Sense Information in FCP response unit*/
char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
{
	char *fcp_sns_info_ptr;

	fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
	if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
		fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;

	return fcp_sns_info_ptr;
}

static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
{
	struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
	unit->device = NULL;
	zfcp_erp_unit_failed(unit, 12, NULL);
	zfcp_unit_put(unit);
}

static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
{
	if (sdp->tagged_supported)
		scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
	else
		scsi_adjust_queue_depth(sdp, 0, 1);
	return 0;
}

static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
{
	set_host_byte(scpnt, result);
	if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
		zfcp_scsi_dbf_event_result("fail", 4,
			(struct zfcp_adapter*) scpnt->device->host->hostdata[0],
			scpnt, NULL);
	/* return directly */
	scpnt->scsi_done(scpnt);
}

static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
				  void (*done) (struct scsi_cmnd *))
{
	struct zfcp_unit *unit;
	struct zfcp_adapter *adapter;
	int    status;
	int    ret;

	/* reset the status for this request */
	scpnt->result = 0;
	scpnt->host_scribble = NULL;
	scpnt->scsi_done = done;

	/*
	 * figure out adapter and target device
	 * (stored there by zfcp_scsi_slave_alloc)
	 */
	adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
	unit = scpnt->device->hostdata;

	BUG_ON(!adapter || (adapter != unit->port->adapter));
	BUG_ON(!scpnt->scsi_done);

	if (unlikely(!unit)) {
		zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
		return 0;
	}

	status = atomic_read(&unit->status);
	if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
		     !(status & ZFCP_STATUS_COMMON_RUNNING))) {
		zfcp_scsi_command_fail(scpnt, DID_ERROR);
		return 0;;
	}

	ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
	if (unlikely(ret == -EBUSY))
		return SCSI_MLQUEUE_DEVICE_BUSY;
	else if (unlikely(ret < 0))
		return SCSI_MLQUEUE_HOST_BUSY;

	return ret;
}

static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
					  int channel, unsigned int id,
					  unsigned int lun)
{
	struct zfcp_port *port;
	struct zfcp_unit *unit;
	int scsi_lun;

	list_for_each_entry(port, &adapter->port_list_head, list) {
		if (!port->rport || (id != port->rport->scsi_target_id))
			continue;
		list_for_each_entry(unit, &port->unit_list_head, list) {
			scsi_lun = scsilun_to_int(
				(struct scsi_lun *)&unit->fcp_lun);
			if (lun == scsi_lun)
				return unit;
		}
	}

	return NULL;
}

static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
{
	struct zfcp_adapter *adapter;
	struct zfcp_unit *unit;
	unsigned long flags;
	int retval = -ENXIO;

	adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
	if (!adapter)
		goto out;

	read_lock_irqsave(&zfcp_data.config_lock, flags);
	unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
	if (unit) {
		sdp->hostdata = unit;
		unit->device = sdp;
		zfcp_unit_get(unit);
		retval = 0;
	}
	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
out:
	return retval;
}

static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
{
	struct Scsi_Host *scsi_host = scpnt->device->host;
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *) scsi_host->hostdata[0];
	struct zfcp_unit *unit = scpnt->device->hostdata;
	struct zfcp_fsf_req *old_req, *abrt_req;
	unsigned long flags;
	unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
	int retval = SUCCESS;
	int retry = 3;

	/* avoid race condition between late normal completion and abort */
	write_lock_irqsave(&adapter->abort_lock, flags);

	spin_lock(&adapter->req_list_lock);
	old_req = zfcp_reqlist_find(adapter, old_req_id);
	spin_unlock(&adapter->req_list_lock);
	if (!old_req) {
		write_unlock_irqrestore(&adapter->abort_lock, flags);
		zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL,
					  old_req_id);
		return SUCCESS;
	}
	old_req->data = NULL;

	/* don't access old fsf_req after releasing the abort_lock */
	write_unlock_irqrestore(&adapter->abort_lock, flags);

	while (retry--) {
		abrt_req = zfcp_fsf_abort_fcp_command(old_req_id, unit);
		if (abrt_req)
			break;

		zfcp_erp_wait(adapter);
		if (!(atomic_read(&adapter->status) &
		      ZFCP_STATUS_COMMON_RUNNING)) {
			zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
						  old_req_id);
			return SUCCESS;
		}
	}
	if (!abrt_req)
		return FAILED;

	wait_event(abrt_req->completion_wq,
		   abrt_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);

	if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
		zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, abrt_req, 0);
	else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
		zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, abrt_req, 0);
	else {
		zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, abrt_req, 0);
		retval = FAILED;
	}
	zfcp_fsf_req_free(abrt_req);
	return retval;
}

static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
{
	struct zfcp_unit *unit = scpnt->device->hostdata;
	struct zfcp_adapter *adapter = unit->port->adapter;
	struct zfcp_fsf_req *fsf_req;
	int retval = SUCCESS;
	int retry = 3;

	while (retry--) {
		fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
		if (fsf_req)
			break;

		zfcp_erp_wait(adapter);
		if (!(atomic_read(&adapter->status) &
		      ZFCP_STATUS_COMMON_RUNNING)) {
			zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit,
						     scpnt);
			return SUCCESS;
		}
	}
	if (!fsf_req)
		return FAILED;

	wait_event(fsf_req->completion_wq,
		   fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);

	if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
		zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
		retval = FAILED;
	} else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
		zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
		retval = FAILED;
	} else
		zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);

	zfcp_fsf_req_free(fsf_req);
	return retval;
}

static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
{
	return zfcp_task_mgmt_function(scpnt, FCP_LOGICAL_UNIT_RESET);
}

static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
{
	return zfcp_task_mgmt_function(scpnt, FCP_TARGET_RESET);
}

static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
{
	struct zfcp_unit *unit = scpnt->device->hostdata;
	struct zfcp_adapter *adapter = unit->port->adapter;

	zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
	zfcp_erp_wait(adapter);

	return SUCCESS;
}

int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
{
	struct ccw_dev_id dev_id;

	if (adapter->scsi_host)
		return 0;

	ccw_device_get_id(adapter->ccw_device, &dev_id);
	/* register adapter as SCSI host with mid layer of SCSI stack */
	adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
					     sizeof (struct zfcp_adapter *));
	if (!adapter->scsi_host) {
		dev_err(&adapter->ccw_device->dev,
			"Registering the FCP device with the "
			"SCSI stack failed\n");
		return -EIO;
	}

	/* tell the SCSI stack some characteristics of this adapter */
	adapter->scsi_host->max_id = 1;
	adapter->scsi_host->max_lun = 1;
	adapter->scsi_host->max_channel = 0;
	adapter->scsi_host->unique_id = dev_id.devno;
	adapter->scsi_host->max_cmd_len = 255;
	adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;

	adapter->scsi_host->hostdata[0] = (unsigned long) adapter;

	if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
		scsi_host_put(adapter->scsi_host);
		return -EIO;
	}

	return 0;
}

void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
{
	struct Scsi_Host *shost;
	struct zfcp_port *port;

	shost = adapter->scsi_host;
	if (!shost)
		return;

	read_lock_irq(&zfcp_data.config_lock);
	list_for_each_entry(port, &adapter->port_list_head, list)
		if (port->rport)
			port->rport = NULL;

	read_unlock_irq(&zfcp_data.config_lock);
	fc_remove_host(shost);
	scsi_remove_host(shost);
	scsi_host_put(shost);
	adapter->scsi_host = NULL;

	return;
}

static struct fc_host_statistics*
zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
{
	struct fc_host_statistics *fc_stats;

	if (!adapter->fc_stats) {
		fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
		if (!fc_stats)
			return NULL;
		adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
	}
	memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
	return adapter->fc_stats;
}

static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
				      struct fsf_qtcb_bottom_port *data,
				      struct fsf_qtcb_bottom_port *old)
{
	fc_stats->seconds_since_last_reset =
		data->seconds_since_last_reset - old->seconds_since_last_reset;
	fc_stats->tx_frames = data->tx_frames - old->tx_frames;
	fc_stats->tx_words = data->tx_words - old->tx_words;
	fc_stats->rx_frames = data->rx_frames - old->rx_frames;
	fc_stats->rx_words = data->rx_words - old->rx_words;
	fc_stats->lip_count = data->lip - old->lip;
	fc_stats->nos_count = data->nos - old->nos;
	fc_stats->error_frames = data->error_frames - old->error_frames;
	fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
	fc_stats->link_failure_count = data->link_failure - old->link_failure;
	fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
	fc_stats->loss_of_signal_count =
		data->loss_of_signal - old->loss_of_signal;
	fc_stats->prim_seq_protocol_err_count =
		data->psp_error_counts - old->psp_error_counts;
	fc_stats->invalid_tx_word_count =
		data->invalid_tx_words - old->invalid_tx_words;
	fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
	fc_stats->fcp_input_requests =
		data->input_requests - old->input_requests;
	fc_stats->fcp_output_requests =
		data->output_requests - old->output_requests;
	fc_stats->fcp_control_requests =
		data->control_requests - old->control_requests;
	fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
	fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
}

static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
				   struct fsf_qtcb_bottom_port *data)
{
	fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
	fc_stats->tx_frames = data->tx_frames;
	fc_stats->tx_words = data->tx_words;
	fc_stats->rx_frames = data->rx_frames;
	fc_stats->rx_words = data->rx_words;
	fc_stats->lip_count = data->lip;
	fc_stats->nos_count = data->nos;
	fc_stats->error_frames = data->error_frames;
	fc_stats->dumped_frames = data->dumped_frames;
	fc_stats->link_failure_count = data->link_failure;
	fc_stats->loss_of_sync_count = data->loss_of_sync;
	fc_stats->loss_of_signal_count = data->loss_of_signal;
	fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
	fc_stats->invalid_tx_word_count = data->invalid_tx_words;
	fc_stats->invalid_crc_count = data->invalid_crcs;
	fc_stats->fcp_input_requests = data->input_requests;
	fc_stats->fcp_output_requests = data->output_requests;
	fc_stats->fcp_control_requests = data->control_requests;
	fc_stats->fcp_input_megabytes = data->input_mb;
	fc_stats->fcp_output_megabytes = data->output_mb;
}

static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
{
	struct zfcp_adapter *adapter;
	struct fc_host_statistics *fc_stats;
	struct fsf_qtcb_bottom_port *data;
	int ret;

	adapter = (struct zfcp_adapter *)host->hostdata[0];
	fc_stats = zfcp_init_fc_host_stats(adapter);
	if (!fc_stats)
		return NULL;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return NULL;

	ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
	if (ret) {
		kfree(data);
		return NULL;
	}

	if (adapter->stats_reset &&
	    ((jiffies/HZ - adapter->stats_reset) <
	     data->seconds_since_last_reset))
		zfcp_adjust_fc_host_stats(fc_stats, data,
					  adapter->stats_reset_data);
	else
		zfcp_set_fc_host_stats(fc_stats, data);

	kfree(data);
	return fc_stats;
}

static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
{
	struct zfcp_adapter *adapter;
	struct fsf_qtcb_bottom_port *data;
	int ret;

	adapter = (struct zfcp_adapter *)shost->hostdata[0];
	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return;

	ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
	if (ret)
		kfree(data);
	else {
		adapter->stats_reset = jiffies/HZ;
		kfree(adapter->stats_reset_data);
		adapter->stats_reset_data = data; /* finally freed in
						     adapter_dequeue */
	}
}

static void zfcp_get_host_port_state(struct Scsi_Host *shost)
{
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *)shost->hostdata[0];
	int status = atomic_read(&adapter->status);

	if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
	    !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
	else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
	else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
		fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
	else
		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
}

static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
{
	rport->dev_loss_tmo = timeout;
}

struct fc_function_template zfcp_transport_functions = {
	.show_starget_port_id = 1,
	.show_starget_port_name = 1,
	.show_starget_node_name = 1,
	.show_rport_supported_classes = 1,
	.show_rport_maxframe_size = 1,
	.show_rport_dev_loss_tmo = 1,
	.show_host_node_name = 1,
	.show_host_port_name = 1,
	.show_host_permanent_port_name = 1,
	.show_host_supported_classes = 1,
	.show_host_supported_speeds = 1,
	.show_host_maxframe_size = 1,
	.show_host_serial_number = 1,
	.get_fc_host_stats = zfcp_get_fc_host_stats,
	.reset_fc_host_stats = zfcp_reset_fc_host_stats,
	.set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
	.get_host_port_state = zfcp_get_host_port_state,
	.show_host_port_state = 1,
	/* no functions registered for following dynamic attributes but
	   directly set by LLDD */
	.show_host_port_type = 1,
	.show_host_speed = 1,
	.show_host_port_id = 1,
	.disable_target_scan = 1,
};

struct zfcp_data zfcp_data = {
	.scsi_host_template = {
		.name			 = "zfcp",
		.module			 = THIS_MODULE,
		.proc_name		 = "zfcp",
		.slave_alloc		 = zfcp_scsi_slave_alloc,
		.slave_configure	 = zfcp_scsi_slave_configure,
		.slave_destroy		 = zfcp_scsi_slave_destroy,
		.queuecommand		 = zfcp_scsi_queuecommand,
		.eh_abort_handler	 = zfcp_scsi_eh_abort_handler,
		.eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
		.eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
		.eh_host_reset_handler	 = zfcp_scsi_eh_host_reset_handler,
		.can_queue		 = 4096,
		.this_id		 = -1,
		.sg_tablesize		 = ZFCP_MAX_SBALES_PER_REQ,
		.cmd_per_lun		 = 1,
		.use_clustering		 = 1,
		.sdev_attrs		 = zfcp_sysfs_sdev_attrs,
		.max_sectors		 = (ZFCP_MAX_SBALES_PER_REQ * 8),
		.shost_attrs		 = zfcp_sysfs_shost_attrs,
	},
};