aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/scsi/zfcp_dbf.c
blob: 3c1d22097ad0b66296e730463b01a19775a18977 (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
/*
 * zfcp device driver
 *
 * Debug traces for zfcp.
 *
 * Copyright IBM Corp. 2002, 2010
 */

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

#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <asm/debug.h>
#include "zfcp_dbf.h"
#include "zfcp_ext.h"
#include "zfcp_fc.h"

static u32 dbfsize = 4;

module_param(dbfsize, uint, 0400);
MODULE_PARM_DESC(dbfsize,
		 "number of pages for each debug feature area (default 4)");

static inline unsigned int zfcp_dbf_plen(unsigned int offset)
{
	return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC;
}

static inline
void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
		       u64 req_id)
{
	struct zfcp_dbf_pay *pl = &dbf->pay_buf;
	u16 offset = 0, rec_length;

	spin_lock(&dbf->pay_lock);
	memset(pl, 0, sizeof(*pl));
	pl->fsf_req_id = req_id;
	memcpy(pl->area, area, ZFCP_DBF_TAG_LEN);

	while (offset < length) {
		rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC,
				 (u16) (length - offset));
		memcpy(pl->data, data + offset, rec_length);
		debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length));

		offset += rec_length;
		pl->counter++;
	}

	spin_unlock(&dbf->pay_lock);
}

/**
 * zfcp_dbf_hba_fsf_res - trace event for fsf responses
 * @tag: tag indicating which kind of unsolicited status has been received
 * @req: request for which a response was received
 */
void zfcp_dbf_hba_fsf_res(char *tag, struct zfcp_fsf_req *req)
{
	struct zfcp_dbf *dbf = req->adapter->dbf;
	struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
	struct fsf_qtcb_header *q_head = &req->qtcb->header;
	struct zfcp_dbf_hba *rec = &dbf->hba_buf;
	unsigned long flags;

	spin_lock_irqsave(&dbf->hba_lock, flags);
	memset(rec, 0, sizeof(*rec));

	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
	rec->id = ZFCP_DBF_HBA_RES;
	rec->fsf_req_id = req->req_id;
	rec->fsf_req_status = req->status;
	rec->fsf_cmd = req->fsf_command;
	rec->fsf_seq_no = req->seq_no;
	rec->u.res.req_issued = req->issued;
	rec->u.res.prot_status = q_pref->prot_status;
	rec->u.res.fsf_status = q_head->fsf_status;

	memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual,
	       FSF_PROT_STATUS_QUAL_SIZE);
	memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual,
	       FSF_STATUS_QUALIFIER_SIZE);

	if (req->fsf_command != FSF_QTCB_FCP_CMND) {
		rec->pl_len = q_head->log_length;
		zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
				  rec->pl_len, "fsf_res", req->req_id);
	}

	debug_event(dbf->hba, 1, rec, sizeof(*rec));
	spin_unlock_irqrestore(&dbf->hba_lock, flags);
}

/**
 * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer
 * @tag: tag indicating which kind of unsolicited status has been received
 * @req: request providing the unsolicited status
 */
void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
{
	struct zfcp_dbf *dbf = req->adapter->dbf;
	struct fsf_status_read_buffer *srb = req->data;
	struct zfcp_dbf_hba *rec = &dbf->hba_buf;
	unsigned long flags;

	spin_lock_irqsave(&dbf->hba_lock, flags);
	memset(rec, 0, sizeof(*rec));

	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
	rec->id = ZFCP_DBF_HBA_USS;
	rec->fsf_req_id = req->req_id;
	rec->fsf_req_status = req->status;
	rec->fsf_cmd = req->fsf_command;

	if (!srb)
		goto log;

	rec->u.uss.status_type = srb->status_type;
	rec->u.uss.status_subtype = srb->status_subtype;
	rec->u.uss.d_id = ntoh24(srb->d_id);
	rec->u.uss.lun = srb->fcp_lun;
	memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
	       sizeof(rec->u.uss.queue_designator));

	/* status read buffer payload length */
	rec->pl_len = (!srb->length) ? 0 : srb->length -
			offsetof(struct fsf_status_read_buffer, payload);

	if (rec->pl_len)
		zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
				  "fsf_uss", req->req_id);
log:
	debug_event(dbf->hba, 2, rec, sizeof(*rec));
	spin_unlock_irqrestore(&dbf->hba_lock, flags);
}

/**
 * zfcp_dbf_hba_bit_err - trace event for bit error conditions
 * @tag: tag indicating which kind of unsolicited status has been received
 * @req: request which caused the bit_error condition
 */
void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
{
	struct zfcp_dbf *dbf = req->adapter->dbf;
	struct zfcp_dbf_hba *rec = &dbf->hba_buf;
	struct fsf_status_read_buffer *sr_buf = req->data;
	unsigned long flags;

	spin_lock_irqsave(&dbf->hba_lock, flags);
	memset(rec, 0, sizeof(*rec));

	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
	rec->id = ZFCP_DBF_HBA_BIT;
	rec->fsf_req_id = req->req_id;
	rec->fsf_req_status = req->status;
	rec->fsf_cmd = req->fsf_command;
	memcpy(&rec->u.be, &sr_buf->payload.bit_error,
	       sizeof(struct fsf_bit_error_payload));

	debug_event(dbf->hba, 1, rec, sizeof(*rec));
	spin_unlock_irqrestore(&dbf->hba_lock, flags);
}

/**
 * zfcp_dbf_hba_def_err - trace event for deferred error messages
 * @adapter: pointer to struct zfcp_adapter
 * @req_id: request id which caused the deferred error message
 * @scount: number of sbals incl. the signaling sbal
 * @pl: array of all involved sbals
 */
void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
			  void **pl)
{
	struct zfcp_dbf *dbf = adapter->dbf;
	struct zfcp_dbf_pay *payload = &dbf->pay_buf;
	unsigned long flags;
	u16 length;

	if (!pl)
		return;

	spin_lock_irqsave(&dbf->pay_lock, flags);
	memset(payload, 0, sizeof(*payload));

	memcpy(payload->area, "def_err", 7);
	payload->fsf_req_id = req_id;
	payload->counter = 0;
	length = min((u16)sizeof(struct qdio_buffer),
		     (u16)ZFCP_DBF_PAY_MAX_REC);

	while ((char *)pl[payload->counter] && payload->counter < scount) {
		memcpy(payload->data, (char *)pl[payload->counter], length);
		debug_event(dbf->pay, 1, payload, zfcp_dbf_plen(length));
		payload->counter++;
	}

	spin_unlock_irqrestore(&dbf->pay_lock, flags);
}

static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
				struct zfcp_adapter *adapter,
				struct zfcp_port *port,
				struct scsi_device *sdev)
{
	rec->adapter_status = atomic_read(&adapter->status);
	if (port) {
		rec->port_status = atomic_read(&port->status);
		rec->wwpn = port->wwpn;
		rec->d_id = port->d_id;
	}
	if (sdev) {
		rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status);
		rec->lun = zfcp_scsi_dev_lun(sdev);
	}
}

/**
 * zfcp_dbf_rec_trig - trace event related to triggered recovery
 * @tag: identifier for event
 * @adapter: adapter on which the erp_action should run
 * @port: remote port involved in the erp_action
 * @sdev: scsi device involved in the erp_action
 * @want: wanted erp_action
 * @need: required erp_action
 *
 * The adapter->erp_lock has to be held.
 */
void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
		       struct zfcp_port *port, struct scsi_device *sdev,
		       u8 want, u8 need)
{
	struct zfcp_dbf *dbf = adapter->dbf;
	struct zfcp_dbf_rec *rec = &dbf->rec_buf;
	struct list_head *entry;
	unsigned long flags;

	spin_lock_irqsave(&dbf->rec_lock, flags);
	memset(rec, 0, sizeof(*rec));

	rec->id = ZFCP_DBF_REC_TRIG;
	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
	zfcp_dbf_set_common(rec, adapter, port, sdev);

	list_for_each(entry, &adapter->erp_ready_head)
		rec->u.trig.ready++;

	list_for_each(entry, &adapter->erp_running_head)
		rec->u.trig.running++;

	rec->u.trig.want = want;
	rec->u.trig.need = need;

	debug_event(dbf->rec, 1, rec, sizeof(*rec));
	spin_unlock_irqrestore(&dbf->rec_lock, flags);
}


/**
 * zfcp_dbf_rec_run - trace event related to running recovery
 * @tag: identifier for event
 * @erp: erp_action running
 */
void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
{
	struct zfcp_dbf *dbf = erp->adapter->dbf;
	struct zfcp_dbf_rec *rec = &dbf->rec_buf;
	unsigned long flags;

	spin_lock_irqsave(&dbf->rec_lock, flags);
	memset(rec, 0, sizeof(*rec));

	rec->id = ZFCP_DBF_REC_RUN;
	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
	zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);

	rec->u.run.fsf_req_id = erp->fsf_req_id;
	rec->u.run.rec_status = erp->status;
	rec->u.run.rec_step = erp->step;
	rec->u.run.rec_action = erp->action;

	if (erp->sdev)
		rec->u.run.rec_count =
			atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
	else if (erp->port)
		rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
	else
		rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);

	debug_event(dbf->rec, 1, rec, sizeof(*rec));
	spin_unlock_irqrestore(&dbf->rec_lock, flags);
}

static inline
void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
		  u64 req_id, u32 d_id)
{
	struct zfcp_dbf_san *rec = &dbf->san_buf;
	u16 rec_len;
	unsigned long flags;

	spin_lock_irqsave(&dbf->san_lock, flags);
	memset(rec, 0, sizeof(*rec));

	rec->id = id;
	rec->fsf_req_id = req_id;
	rec->d_id = d_id;
	rec_len = min(len, (u16)ZFCP_DBF_SAN_MAX_PAYLOAD);
	memcpy(rec->payload, data, rec_len);
	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);

	debug_event(dbf->san, 1, rec, sizeof(*rec));
	spin_unlock_irqrestore(&dbf->san_lock, flags);
}

/**
 * zfcp_dbf_san_req - trace event for issued SAN request
 * @tag: indentifier for event
 * @fsf_req: request containing issued CT data
 * d_id: destination ID
 */
void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
{
	struct zfcp_dbf *dbf = fsf->adapter->dbf;
	struct zfcp_fsf_ct_els *ct_els = fsf->data;
	u16 length;

	length = (u16)(ct_els->req->length + FC_CT_HDR_LEN);
	zfcp_dbf_san(tag, dbf, sg_virt(ct_els->req), ZFCP_DBF_SAN_REQ, length,
		     fsf->req_id, d_id);
}

/**
 * zfcp_dbf_san_res - trace event for received SAN request
 * @tag: indentifier for event
 * @fsf_req: request containing issued CT data
 */
void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
{
	struct zfcp_dbf *dbf = fsf->adapter->dbf;
	struct zfcp_fsf_ct_els *ct_els = fsf->data;
	u16 length;

	length = (u16)(ct_els->resp->length + FC_CT_HDR_LEN);
	zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
		     fsf->req_id, 0);
}

/**
 * zfcp_dbf_san_in_els - trace event for incoming ELS
 * @tag: indentifier for event
 * @fsf_req: request containing issued CT data
 */
void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
{
	struct zfcp_dbf *dbf = fsf->adapter->dbf;
	struct fsf_status_read_buffer *srb =
		(struct fsf_status_read_buffer *) fsf->data;
	u16 length;

	length = (u16)(srb->length -
			offsetof(struct fsf_status_read_buffer, payload));
	zfcp_dbf_san(tag, dbf, srb->payload.data, ZFCP_DBF_SAN_ELS, length,
		     fsf->req_id, ntoh24(srb->d_id));
}

/**
 * zfcp_dbf_scsi - trace event for scsi commands
 * @tag: identifier for event
 * @sc: pointer to struct scsi_cmnd
 * @fsf: pointer to struct zfcp_fsf_req
 */
void zfcp_dbf_scsi(char *tag, struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf)
{
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *) sc->device->host->hostdata[0];
	struct zfcp_dbf *dbf = adapter->dbf;
	struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
	struct fcp_resp_with_ext *fcp_rsp;
	struct fcp_resp_rsp_info *fcp_rsp_info;
	unsigned long flags;

	spin_lock_irqsave(&dbf->scsi_lock, flags);
	memset(rec, 0, sizeof(*rec));

	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
	rec->id = ZFCP_DBF_SCSI_CMND;
	rec->scsi_result = sc->result;
	rec->scsi_retries = sc->retries;
	rec->scsi_allowed = sc->allowed;
	rec->scsi_id = sc->device->id;
	rec->scsi_lun = sc->device->lun;
	rec->host_scribble = (unsigned long)sc->host_scribble;

	memcpy(rec->scsi_opcode, sc->cmnd,
	       min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));

	if (fsf) {
		rec->fsf_req_id = fsf->req_id;
		fcp_rsp = (struct fcp_resp_with_ext *)
				&(fsf->qtcb->bottom.io.fcp_rsp);
		memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
		if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
			fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
			rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
		}
		if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
			rec->pl_len = min((u16)SCSI_SENSE_BUFFERSIZE,
					  (u16)ZFCP_DBF_PAY_MAX_REC);
			zfcp_dbf_pl_write(dbf, sc->sense_buffer, rec->pl_len,
					  "fcp_sns", fsf->req_id);
		}
	}

	debug_event(dbf->scsi, 1, rec, sizeof(*rec));
	spin_unlock_irqrestore(&dbf->scsi_lock, flags);
}

static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
{
	struct debug_info *d;

	d = debug_register(name, size, 1, rec_size);
	if (!d)
		return NULL;

	debug_register_view(d, &debug_hex_ascii_view);
	debug_set_level(d, 3);

	return d;
}

static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
{
	if (!dbf)
		return;

	debug_unregister(dbf->scsi);
	debug_unregister(dbf->san);
	debug_unregister(dbf->hba);
	debug_unregister(dbf->pay);
	debug_unregister(dbf->rec);
	kfree(dbf);
}

/**
 * zfcp_adapter_debug_register - registers debug feature for an adapter
 * @adapter: pointer to adapter for which debug features should be registered
 * return: -ENOMEM on error, 0 otherwise
 */
int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
{
	char name[DEBUG_MAX_NAME_LEN];
	struct zfcp_dbf *dbf;

	dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
	if (!dbf)
		return -ENOMEM;

	spin_lock_init(&dbf->pay_lock);
	spin_lock_init(&dbf->hba_lock);
	spin_lock_init(&dbf->san_lock);
	spin_lock_init(&dbf->scsi_lock);
	spin_lock_init(&dbf->rec_lock);

	/* debug feature area which records recovery activity */
	sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
	dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
	if (!dbf->rec)
		goto err_out;

	/* debug feature area which records HBA (FSF and QDIO) conditions */
	sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
	dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
	if (!dbf->hba)
		goto err_out;

	/* debug feature area which records payload info */
	sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
	dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
	if (!dbf->pay)
		goto err_out;

	/* debug feature area which records SAN command failures and recovery */
	sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
	dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
	if (!dbf->san)
		goto err_out;

	/* debug feature area which records SCSI command failures and recovery */
	sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
	dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
	if (!dbf->scsi)
		goto err_out;

	adapter->dbf = dbf;

	return 0;
err_out:
	zfcp_dbf_unregister(dbf);
	return -ENOMEM;
}

/**
 * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
 * @adapter: pointer to adapter for which debug features should be unregistered
 */
void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
{
	struct zfcp_dbf *dbf = adapter->dbf;

	adapter->dbf = NULL;
	zfcp_dbf_unregister(dbf);
}