xref: /linux/drivers/s390/scsi/zfcp_dbf.h (revision ead5d1f4d877e92c051e1a1ade623d0d30e71619)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * zfcp device driver
4  * debug feature declarations
5  *
6  * Copyright IBM Corp. 2008, 2020
7  */
8 
9 #ifndef ZFCP_DBF_H
10 #define ZFCP_DBF_H
11 
12 #include <scsi/fc/fc_fcp.h>
13 #include "zfcp_ext.h"
14 #include "zfcp_fsf.h"
15 #include "zfcp_def.h"
16 
17 #define ZFCP_DBF_TAG_LEN       7
18 
19 #define ZFCP_DBF_INVALID_WWPN	0x0000000000000000ull
20 #define ZFCP_DBF_INVALID_LUN	0xFFFFFFFFFFFFFFFFull
21 
22 enum zfcp_dbf_pseudo_erp_act_type {
23 	ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD = 0xff,
24 	ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL = 0xfe,
25 };
26 
27 /**
28  * struct zfcp_dbf_rec_trigger - trace record for triggered recovery action
29  * @ready: number of ready recovery actions
30  * @running: number of running recovery actions
31  * @want: wanted recovery action
32  * @need: needed recovery action
33  */
34 struct zfcp_dbf_rec_trigger {
35 	u32 ready;
36 	u32 running;
37 	u8 want;
38 	u8 need;
39 } __packed;
40 
41 /**
42  * struct zfcp_dbf_rec_running - trace record for running recovery
43  * @fsf_req_id: request id for fsf requests
44  * @rec_status: status of the fsf request
45  * @rec_step: current step of the recovery action
46  * @rec_action: ERP action type
47  * @rec_count: recoveries including retries for particular @rec_action
48  */
49 struct zfcp_dbf_rec_running {
50 	u64 fsf_req_id;
51 	u32 rec_status;
52 	u16 rec_step;
53 	u8 rec_action;
54 	u8 rec_count;
55 } __packed;
56 
57 /**
58  * enum zfcp_dbf_rec_id - recovery trace record id
59  * @ZFCP_DBF_REC_TRIG: triggered recovery identifier
60  * @ZFCP_DBF_REC_RUN: running recovery identifier
61  */
62 enum zfcp_dbf_rec_id {
63 	ZFCP_DBF_REC_TRIG	= 1,
64 	ZFCP_DBF_REC_RUN	= 2,
65 };
66 
67 /**
68  * struct zfcp_dbf_rec - trace record for error recovery actions
69  * @id: unique number of recovery record type
70  * @tag: identifier string specifying the location of initiation
71  * @lun: logical unit number
72  * @wwpn: word wide port number
73  * @d_id: destination ID
74  * @adapter_status: current status of the adapter
75  * @port_status: current status of the port
76  * @lun_status: current status of the lun
77  * @u: record type specific data
78  * @u.trig: structure zfcp_dbf_rec_trigger
79  * @u.run: structure zfcp_dbf_rec_running
80  */
81 struct zfcp_dbf_rec {
82 	u8 id;
83 	char tag[ZFCP_DBF_TAG_LEN];
84 	u64 lun;
85 	u64 wwpn;
86 	u32 d_id;
87 	u32 adapter_status;
88 	u32 port_status;
89 	u32 lun_status;
90 	union {
91 		struct zfcp_dbf_rec_trigger trig;
92 		struct zfcp_dbf_rec_running run;
93 	} u;
94 } __packed;
95 
96 /**
97  * enum zfcp_dbf_san_id - SAN trace record identifier
98  * @ZFCP_DBF_SAN_REQ: request trace record id
99  * @ZFCP_DBF_SAN_RES: response trace record id
100  * @ZFCP_DBF_SAN_ELS: extended link service record id
101  */
102 enum zfcp_dbf_san_id {
103 	ZFCP_DBF_SAN_REQ	= 1,
104 	ZFCP_DBF_SAN_RES	= 2,
105 	ZFCP_DBF_SAN_ELS	= 3,
106 };
107 
108 /** struct zfcp_dbf_san - trace record for SAN requests and responses
109  * @id: unique number of recovery record type
110  * @tag: identifier string specifying the location of initiation
111  * @fsf_req_id: request id for fsf requests
112  * @payload: unformatted information related to request/response
113  * @d_id: destination id
114  */
115 struct zfcp_dbf_san {
116 	u8 id;
117 	char tag[ZFCP_DBF_TAG_LEN];
118 	u64 fsf_req_id;
119 	u32 d_id;
120 #define ZFCP_DBF_SAN_MAX_PAYLOAD (FC_CT_HDR_LEN + 32)
121 	char payload[ZFCP_DBF_SAN_MAX_PAYLOAD];
122 	u16 pl_len;
123 } __packed;
124 
125 /**
126  * struct zfcp_dbf_hba_res - trace record for hba responses
127  * @req_issued: timestamp when request was issued
128  * @prot_status: protocol status
129  * @prot_status_qual: protocol status qualifier
130  * @fsf_status: fsf status
131  * @fsf_status_qual: fsf status qualifier
132  * @port_handle: handle for port
133  * @lun_handle: handle for LUN
134  */
135 struct zfcp_dbf_hba_res {
136 	u64 req_issued;
137 	u32 prot_status;
138 	u8  prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
139 	u32 fsf_status;
140 	u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
141 	u32 port_handle;
142 	u32 lun_handle;
143 } __packed;
144 
145 /**
146  * struct zfcp_dbf_hba_uss - trace record for unsolicited status
147  * @status_type: type of unsolicited status
148  * @status_subtype: subtype of unsolicited status
149  * @d_id: destination ID
150  * @lun: logical unit number
151  * @queue_designator: queue designator
152  */
153 struct zfcp_dbf_hba_uss {
154 	u32 status_type;
155 	u32 status_subtype;
156 	u32 d_id;
157 	u64 lun;
158 	u64 queue_designator;
159 } __packed;
160 
161 /**
162  * struct zfcp_dbf_hba_fces - trace record for FC Endpoint Security
163  * @req_issued: timestamp when request was issued
164  * @fsf_status: fsf status
165  * @port_handle: handle for port
166  * @wwpn: remote FC port WWPN
167  * @fc_security_old: old FC Endpoint Security
168  * @fc_security_new: new FC Endpoint Security
169  *
170  */
171 struct zfcp_dbf_hba_fces {
172 	u64 req_issued;
173 	u32 fsf_status;
174 	u32 port_handle;
175 	u64 wwpn;
176 	u32 fc_security_old;
177 	u32 fc_security_new;
178 } __packed;
179 
180 /**
181  * enum zfcp_dbf_hba_id - HBA trace record identifier
182  * @ZFCP_DBF_HBA_RES: response trace record
183  * @ZFCP_DBF_HBA_USS: unsolicited status trace record
184  * @ZFCP_DBF_HBA_BIT: bit error trace record
185  * @ZFCP_DBF_HBA_BASIC: basic adapter event, only trace tag, no other data
186  * @ZFCP_DBF_HBA_FCES: FC Endpoint Security trace record
187  */
188 enum zfcp_dbf_hba_id {
189 	ZFCP_DBF_HBA_RES	= 1,
190 	ZFCP_DBF_HBA_USS	= 2,
191 	ZFCP_DBF_HBA_BIT	= 3,
192 	ZFCP_DBF_HBA_BASIC	= 4,
193 	ZFCP_DBF_HBA_FCES	= 5,
194 };
195 
196 /**
197  * struct zfcp_dbf_hba - common trace record for HBA records
198  * @id: unique number of recovery record type
199  * @tag: identifier string specifying the location of initiation
200  * @fsf_req_id: request id for fsf requests
201  * @fsf_req_status: status of fsf request
202  * @fsf_cmd: fsf command
203  * @fsf_seq_no: fsf sequence number
204  * @pl_len: length of payload stored as zfcp_dbf_pay
205  * @u: record type specific data
206  * @u.res:  data for fsf responses
207  * @u.uss:  data for unsolicited status buffer
208  * @u.be:   data for bit error unsolicited status buffer
209  * @u.fces: data for FC Endpoint Security
210  */
211 struct zfcp_dbf_hba {
212 	u8 id;
213 	char tag[ZFCP_DBF_TAG_LEN];
214 	u64 fsf_req_id;
215 	u32 fsf_req_status;
216 	u32 fsf_cmd;
217 	u32 fsf_seq_no;
218 	u16 pl_len;
219 	union {
220 		struct zfcp_dbf_hba_res res;
221 		struct zfcp_dbf_hba_uss uss;
222 		struct fsf_bit_error_payload be;
223 		struct zfcp_dbf_hba_fces fces;
224 	} u;
225 } __packed;
226 
227 /**
228  * enum zfcp_dbf_scsi_id - scsi trace record identifier
229  * @ZFCP_DBF_SCSI_CMND: scsi command trace record
230  */
231 enum zfcp_dbf_scsi_id {
232 	ZFCP_DBF_SCSI_CMND	= 1,
233 };
234 
235 /**
236  * struct zfcp_dbf_scsi - common trace record for SCSI records
237  * @id: unique number of recovery record type
238  * @tag: identifier string specifying the location of initiation
239  * @scsi_id: scsi device id
240  * @scsi_lun: scsi device logical unit number, low part of 64 bit, old 32 bit
241  * @scsi_result: scsi result
242  * @scsi_retries: current retry number of scsi request
243  * @scsi_allowed: allowed retries
244  * @fcp_rsp_info: FCP response info code
245  * @scsi_opcode: scsi opcode
246  * @fsf_req_id: request id of fsf request
247  * @host_scribble: LLD specific data attached to SCSI request
248  * @pl_len: length of payload stored as zfcp_dbf_pay
249  * @fcp_rsp: response for FCP request
250  * @scsi_lun_64_hi: scsi device logical unit number, high part of 64 bit
251  */
252 struct zfcp_dbf_scsi {
253 	u8 id;
254 	char tag[ZFCP_DBF_TAG_LEN];
255 	u32 scsi_id;
256 	u32 scsi_lun;
257 	u32 scsi_result;
258 	u8 scsi_retries;
259 	u8 scsi_allowed;
260 	u8 fcp_rsp_info;
261 #define ZFCP_DBF_SCSI_OPCODE	16
262 	u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
263 	u64 fsf_req_id;
264 	u64 host_scribble;
265 	u16 pl_len;
266 	struct fcp_resp_with_ext fcp_rsp;
267 	u32 scsi_lun_64_hi;
268 } __packed;
269 
270 /**
271  * struct zfcp_dbf_pay - trace record for unformatted payload information
272  * @area: area this record is originated from
273  * @counter: ascending record number
274  * @fsf_req_id: request id of fsf request
275  * @data: unformatted data
276  */
277 struct zfcp_dbf_pay {
278 	u8 counter;
279 	char area[ZFCP_DBF_TAG_LEN];
280 	u64 fsf_req_id;
281 #define ZFCP_DBF_PAY_MAX_REC 0x100
282 	char data[ZFCP_DBF_PAY_MAX_REC];
283 } __packed;
284 
285 /**
286  * struct zfcp_dbf - main dbf trace structure
287  * @pay: reference to payload trace area
288  * @rec: reference to recovery trace area
289  * @hba: reference to hba trace area
290  * @san: reference to san trace area
291  * @scsi: reference to scsi trace area
292  * @pay_lock: lock protecting payload trace buffer
293  * @rec_lock: lock protecting recovery trace buffer
294  * @hba_lock: lock protecting hba trace buffer
295  * @san_lock: lock protecting san trace buffer
296  * @scsi_lock: lock protecting scsi trace buffer
297  * @pay_buf: pre-allocated buffer for payload
298  * @rec_buf: pre-allocated buffer for recovery
299  * @hba_buf: pre-allocated buffer for hba
300  * @san_buf: pre-allocated buffer for san
301  * @scsi_buf: pre-allocated buffer for scsi
302  */
303 struct zfcp_dbf {
304 	debug_info_t			*pay;
305 	debug_info_t			*rec;
306 	debug_info_t			*hba;
307 	debug_info_t			*san;
308 	debug_info_t			*scsi;
309 	spinlock_t			pay_lock;
310 	spinlock_t			rec_lock;
311 	spinlock_t			hba_lock;
312 	spinlock_t			san_lock;
313 	spinlock_t			scsi_lock;
314 	struct zfcp_dbf_pay		pay_buf;
315 	struct zfcp_dbf_rec		rec_buf;
316 	struct zfcp_dbf_hba		hba_buf;
317 	struct zfcp_dbf_san		san_buf;
318 	struct zfcp_dbf_scsi		scsi_buf;
319 };
320 
321 /**
322  * zfcp_dbf_hba_fsf_resp_suppress - true if we should not trace by default
323  * @req: request that has been completed
324  *
325  * Returns true if FCP response with only benign residual under count.
326  */
327 static inline
zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req * req)328 bool zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req *req)
329 {
330 	struct fsf_qtcb *qtcb = req->qtcb;
331 	u32 fsf_stat = qtcb->header.fsf_status;
332 	struct fcp_resp *fcp_rsp;
333 	u8 rsp_flags, fr_status;
334 
335 	if (qtcb->prefix.qtcb_type != FSF_IO_COMMAND)
336 		return false; /* not an FCP response */
337 	fcp_rsp = &qtcb->bottom.io.fcp_rsp.iu.resp;
338 	rsp_flags = fcp_rsp->fr_flags;
339 	fr_status = fcp_rsp->fr_status;
340 	return (fsf_stat == FSF_FCP_RSP_AVAILABLE) &&
341 		(rsp_flags == FCP_RESID_UNDER) &&
342 		(fr_status == SAM_STAT_GOOD);
343 }
344 
345 static inline
zfcp_dbf_hba_fsf_resp(char * tag,int level,struct zfcp_fsf_req * req)346 void zfcp_dbf_hba_fsf_resp(char *tag, int level, struct zfcp_fsf_req *req)
347 {
348 	if (debug_level_enabled(req->adapter->dbf->hba, level))
349 		zfcp_dbf_hba_fsf_res(tag, level, req);
350 }
351 
352 /**
353  * zfcp_dbf_hba_fsf_response - trace event for request completion
354  * @req: request that has been completed
355  */
356 static inline
zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req * req)357 void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req)
358 {
359 	struct fsf_qtcb *qtcb = req->qtcb;
360 
361 	if (unlikely(req->status & (ZFCP_STATUS_FSFREQ_DISMISSED |
362 				    ZFCP_STATUS_FSFREQ_ERROR))) {
363 		zfcp_dbf_hba_fsf_resp("fs_rerr", 3, req);
364 
365 	} else if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
366 	    (qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
367 		zfcp_dbf_hba_fsf_resp("fs_perr", 1, req);
368 
369 	} else if (qtcb->header.fsf_status != FSF_GOOD) {
370 		zfcp_dbf_hba_fsf_resp("fs_ferr",
371 				      zfcp_dbf_hba_fsf_resp_suppress(req)
372 				      ? 5 : 1, req);
373 
374 	} else if ((qtcb->header.fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
375 		   (qtcb->header.fsf_command == FSF_QTCB_OPEN_LUN)) {
376 		zfcp_dbf_hba_fsf_resp("fs_open", 4, req);
377 
378 	} else if (qtcb->header.log_length) {
379 		zfcp_dbf_hba_fsf_resp("fs_qtcb", 5, req);
380 
381 	} else {
382 		zfcp_dbf_hba_fsf_resp("fs_norm", 6, req);
383 	}
384 }
385 
386 static inline
_zfcp_dbf_scsi(char * tag,int level,struct scsi_cmnd * scmd,struct zfcp_fsf_req * req)387 void _zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *scmd,
388 		   struct zfcp_fsf_req *req)
389 {
390 	struct zfcp_adapter *adapter = (struct zfcp_adapter *)
391 					scmd->device->host->hostdata[0];
392 
393 	if (debug_level_enabled(adapter->dbf->scsi, level))
394 		zfcp_dbf_scsi_common(tag, level, scmd->device, scmd, req);
395 }
396 
397 /**
398  * zfcp_dbf_scsi_result - trace event for SCSI command completion
399  * @scmd: SCSI command pointer
400  * @req: FSF request used to issue SCSI command
401  */
402 static inline
zfcp_dbf_scsi_result(struct scsi_cmnd * scmd,struct zfcp_fsf_req * req)403 void zfcp_dbf_scsi_result(struct scsi_cmnd *scmd, struct zfcp_fsf_req *req)
404 {
405 	if (scmd->result != 0)
406 		_zfcp_dbf_scsi("rsl_err", 3, scmd, req);
407 	else if (scmd->retries > 0)
408 		_zfcp_dbf_scsi("rsl_ret", 4, scmd, req);
409 	else
410 		_zfcp_dbf_scsi("rsl_nor", 6, scmd, req);
411 }
412 
413 /**
414  * zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command
415  * @scmd: SCSI command pointer
416  */
417 static inline
zfcp_dbf_scsi_fail_send(struct scsi_cmnd * scmd)418 void zfcp_dbf_scsi_fail_send(struct scsi_cmnd *scmd)
419 {
420 	_zfcp_dbf_scsi("rsl_fai", 4, scmd, NULL);
421 }
422 
423 /**
424  * zfcp_dbf_scsi_abort - trace event for SCSI command abort
425  * @tag: tag indicating success or failure of abort operation
426  * @scmd: SCSI command to be aborted
427  * @fsf_req: request containing abort (might be NULL)
428  */
429 static inline
zfcp_dbf_scsi_abort(char * tag,struct scsi_cmnd * scmd,struct zfcp_fsf_req * fsf_req)430 void zfcp_dbf_scsi_abort(char *tag, struct scsi_cmnd *scmd,
431 			 struct zfcp_fsf_req *fsf_req)
432 {
433 	_zfcp_dbf_scsi(tag, 1, scmd, fsf_req);
434 }
435 
436 /**
437  * zfcp_dbf_scsi_devreset() - Trace event for Logical Unit or Target Reset.
438  * @tag: Tag indicating success or failure of reset operation.
439  * @sdev: Pointer to SCSI device as context for this event.
440  * @flag: Indicates type of reset (Target Reset, Logical Unit Reset).
441  * @fsf_req: Pointer to FSF request representing the TMF, or NULL.
442  */
443 static inline
zfcp_dbf_scsi_devreset(char * tag,struct scsi_device * sdev,u8 flag,struct zfcp_fsf_req * fsf_req)444 void zfcp_dbf_scsi_devreset(char *tag, struct scsi_device *sdev, u8 flag,
445 			    struct zfcp_fsf_req *fsf_req)
446 {
447 	struct zfcp_adapter *adapter = (struct zfcp_adapter *)
448 					sdev->host->hostdata[0];
449 	char tmp_tag[ZFCP_DBF_TAG_LEN];
450 	static int const level = 1;
451 
452 	if (unlikely(!debug_level_enabled(adapter->dbf->scsi, level)))
453 		return;
454 
455 	if (flag == FCP_TMF_TGT_RESET)
456 		memcpy(tmp_tag, "tr_", 3);
457 	else
458 		memcpy(tmp_tag, "lr_", 3);
459 
460 	memcpy(&tmp_tag[3], tag, 4);
461 	zfcp_dbf_scsi_common(tmp_tag, level, sdev, NULL, fsf_req);
462 }
463 
464 /**
465  * zfcp_dbf_scsi_nullcmnd() - trace NULLify of SCSI command in dev/tgt-reset.
466  * @scmnd: SCSI command that was NULLified.
467  * @fsf_req: request that owned @scmnd.
468  */
zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd * scmnd,struct zfcp_fsf_req * fsf_req)469 static inline void zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd *scmnd,
470 					  struct zfcp_fsf_req *fsf_req)
471 {
472 	_zfcp_dbf_scsi("scfc__1", 3, scmnd, fsf_req);
473 }
474 
475 #endif /* ZFCP_DBF_H */
476