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[kvmfornfv.git] / kernel / drivers / s390 / scsi / zfcp_dbf.h
1 /*
2  * zfcp device driver
3  * debug feature declarations
4  *
5  * Copyright IBM Corp. 2008, 2016
6  */
7
8 #ifndef ZFCP_DBF_H
9 #define ZFCP_DBF_H
10
11 #include <scsi/fc/fc_fcp.h>
12 #include "zfcp_ext.h"
13 #include "zfcp_fsf.h"
14 #include "zfcp_def.h"
15
16 #define ZFCP_DBF_TAG_LEN       7
17
18 #define ZFCP_DBF_INVALID_LUN    0xFFFFFFFFFFFFFFFFull
19
20 enum zfcp_dbf_pseudo_erp_act_type {
21         ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD = 0xff,
22         ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL = 0xfe,
23 };
24
25 /**
26  * struct zfcp_dbf_rec_trigger - trace record for triggered recovery action
27  * @ready: number of ready recovery actions
28  * @running: number of running recovery actions
29  * @want: wanted recovery action
30  * @need: needed recovery action
31  */
32 struct zfcp_dbf_rec_trigger {
33         u32 ready;
34         u32 running;
35         u8 want;
36         u8 need;
37 } __packed;
38
39 /**
40  * struct zfcp_dbf_rec_running - trace record for running recovery
41  * @fsf_req_id: request id for fsf requests
42  * @rec_status: status of the fsf request
43  * @rec_step: current step of the recovery action
44  * rec_count: recovery counter
45  */
46 struct zfcp_dbf_rec_running {
47         u64 fsf_req_id;
48         u32 rec_status;
49         u16 rec_step;
50         u8 rec_action;
51         u8 rec_count;
52 } __packed;
53
54 /**
55  * enum zfcp_dbf_rec_id - recovery trace record id
56  * @ZFCP_DBF_REC_TRIG: triggered recovery identifier
57  * @ZFCP_DBF_REC_RUN: running recovery identifier
58  */
59 enum zfcp_dbf_rec_id {
60         ZFCP_DBF_REC_TRIG       = 1,
61         ZFCP_DBF_REC_RUN        = 2,
62 };
63
64 /**
65  * struct zfcp_dbf_rec - trace record for error recovery actions
66  * @id: unique number of recovery record type
67  * @tag: identifier string specifying the location of initiation
68  * @lun: logical unit number
69  * @wwpn: word wide port number
70  * @d_id: destination ID
71  * @adapter_status: current status of the adapter
72  * @port_status: current status of the port
73  * @lun_status: current status of the lun
74  * @u.trig: structure zfcp_dbf_rec_trigger
75  * @u.run: structure zfcp_dbf_rec_running
76  */
77 struct zfcp_dbf_rec {
78         u8 id;
79         char tag[ZFCP_DBF_TAG_LEN];
80         u64 lun;
81         u64 wwpn;
82         u32 d_id;
83         u32 adapter_status;
84         u32 port_status;
85         u32 lun_status;
86         union {
87                 struct zfcp_dbf_rec_trigger trig;
88                 struct zfcp_dbf_rec_running run;
89         } u;
90 } __packed;
91
92 /**
93  * enum zfcp_dbf_san_id - SAN trace record identifier
94  * @ZFCP_DBF_SAN_REQ: request trace record id
95  * @ZFCP_DBF_SAN_RES: response trace record id
96  * @ZFCP_DBF_SAN_ELS: extended link service record id
97  */
98 enum zfcp_dbf_san_id {
99         ZFCP_DBF_SAN_REQ        = 1,
100         ZFCP_DBF_SAN_RES        = 2,
101         ZFCP_DBF_SAN_ELS        = 3,
102 };
103
104 /** struct zfcp_dbf_san - trace record for SAN requests and responses
105  * @id: unique number of recovery record type
106  * @tag: identifier string specifying the location of initiation
107  * @fsf_req_id: request id for fsf requests
108  * @payload: unformatted information related to request/response
109  * @d_id: destination id
110  */
111 struct zfcp_dbf_san {
112         u8 id;
113         char tag[ZFCP_DBF_TAG_LEN];
114         u64 fsf_req_id;
115         u32 d_id;
116 #define ZFCP_DBF_SAN_MAX_PAYLOAD (FC_CT_HDR_LEN + 32)
117         char payload[ZFCP_DBF_SAN_MAX_PAYLOAD];
118         u16 pl_len;
119 } __packed;
120
121 /**
122  * struct zfcp_dbf_hba_res - trace record for hba responses
123  * @req_issued: timestamp when request was issued
124  * @prot_status: protocol status
125  * @prot_status_qual: protocol status qualifier
126  * @fsf_status: fsf status
127  * @fsf_status_qual: fsf status qualifier
128  */
129 struct zfcp_dbf_hba_res {
130         u64 req_issued;
131         u32 prot_status;
132         u8  prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
133         u32 fsf_status;
134         u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
135         u32 port_handle;
136         u32 lun_handle;
137 } __packed;
138
139 /**
140  * struct zfcp_dbf_hba_uss - trace record for unsolicited status
141  * @status_type: type of unsolicited status
142  * @status_subtype: subtype of unsolicited status
143  * @d_id: destination ID
144  * @lun: logical unit number
145  * @queue_designator: queue designator
146  */
147 struct zfcp_dbf_hba_uss {
148         u32 status_type;
149         u32 status_subtype;
150         u32 d_id;
151         u64 lun;
152         u64 queue_designator;
153 } __packed;
154
155 /**
156  * enum zfcp_dbf_hba_id - HBA trace record identifier
157  * @ZFCP_DBF_HBA_RES: response trace record
158  * @ZFCP_DBF_HBA_USS: unsolicited status trace record
159  * @ZFCP_DBF_HBA_BIT: bit error trace record
160  */
161 enum zfcp_dbf_hba_id {
162         ZFCP_DBF_HBA_RES        = 1,
163         ZFCP_DBF_HBA_USS        = 2,
164         ZFCP_DBF_HBA_BIT        = 3,
165         ZFCP_DBF_HBA_BASIC      = 4,
166 };
167
168 /**
169  * struct zfcp_dbf_hba - common trace record for HBA records
170  * @id: unique number of recovery record type
171  * @tag: identifier string specifying the location of initiation
172  * @fsf_req_id: request id for fsf requests
173  * @fsf_req_status: status of fsf request
174  * @fsf_cmd: fsf command
175  * @fsf_seq_no: fsf sequence number
176  * @pl_len: length of payload stored as zfcp_dbf_pay
177  * @u: record type specific data
178  */
179 struct zfcp_dbf_hba {
180         u8 id;
181         char tag[ZFCP_DBF_TAG_LEN];
182         u64 fsf_req_id;
183         u32 fsf_req_status;
184         u32 fsf_cmd;
185         u32 fsf_seq_no;
186         u16 pl_len;
187         union {
188                 struct zfcp_dbf_hba_res res;
189                 struct zfcp_dbf_hba_uss uss;
190                 struct fsf_bit_error_payload be;
191         } u;
192 } __packed;
193
194 /**
195  * enum zfcp_dbf_scsi_id - scsi trace record identifier
196  * @ZFCP_DBF_SCSI_CMND: scsi command trace record
197  */
198 enum zfcp_dbf_scsi_id {
199         ZFCP_DBF_SCSI_CMND      = 1,
200 };
201
202 /**
203  * struct zfcp_dbf_scsi - common trace record for SCSI records
204  * @id: unique number of recovery record type
205  * @tag: identifier string specifying the location of initiation
206  * @scsi_id: scsi device id
207  * @scsi_lun: scsi device logical unit number
208  * @scsi_result: scsi result
209  * @scsi_retries: current retry number of scsi request
210  * @scsi_allowed: allowed retries
211  * @fcp_rsp_info: FCP response info
212  * @scsi_opcode: scsi opcode
213  * @fsf_req_id: request id of fsf request
214  * @host_scribble: LLD specific data attached to SCSI request
215  * @pl_len: length of paload stored as zfcp_dbf_pay
216  * @fsf_rsp: response for fsf request
217  */
218 struct zfcp_dbf_scsi {
219         u8 id;
220         char tag[ZFCP_DBF_TAG_LEN];
221         u32 scsi_id;
222         u32 scsi_lun;
223         u32 scsi_result;
224         u8 scsi_retries;
225         u8 scsi_allowed;
226         u8 fcp_rsp_info;
227 #define ZFCP_DBF_SCSI_OPCODE    16
228         u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
229         u64 fsf_req_id;
230         u64 host_scribble;
231         u16 pl_len;
232         struct fcp_resp_with_ext fcp_rsp;
233 } __packed;
234
235 /**
236  * struct zfcp_dbf_pay - trace record for unformatted payload information
237  * @area: area this record is originated from
238  * @counter: ascending record number
239  * @fsf_req_id: request id of fsf request
240  * @data: unformatted data
241  */
242 struct zfcp_dbf_pay {
243         u8 counter;
244         char area[ZFCP_DBF_TAG_LEN];
245         u64 fsf_req_id;
246 #define ZFCP_DBF_PAY_MAX_REC 0x100
247         char data[ZFCP_DBF_PAY_MAX_REC];
248 } __packed;
249
250 /**
251  * struct zfcp_dbf - main dbf trace structure
252  * @pay: reference to payload trace area
253  * @rec: reference to recovery trace area
254  * @hba: reference to hba trace area
255  * @san: reference to san trace area
256  * @scsi: reference to scsi trace area
257  * @pay_lock: lock protecting payload trace buffer
258  * @rec_lock: lock protecting recovery trace buffer
259  * @hba_lock: lock protecting hba trace buffer
260  * @san_lock: lock protecting san trace buffer
261  * @scsi_lock: lock protecting scsi trace buffer
262  * @pay_buf: pre-allocated buffer for payload
263  * @rec_buf: pre-allocated buffer for recovery
264  * @hba_buf: pre-allocated buffer for hba
265  * @san_buf: pre-allocated buffer for san
266  * @scsi_buf: pre-allocated buffer for scsi
267  */
268 struct zfcp_dbf {
269         debug_info_t                    *pay;
270         debug_info_t                    *rec;
271         debug_info_t                    *hba;
272         debug_info_t                    *san;
273         debug_info_t                    *scsi;
274         spinlock_t                      pay_lock;
275         spinlock_t                      rec_lock;
276         spinlock_t                      hba_lock;
277         spinlock_t                      san_lock;
278         spinlock_t                      scsi_lock;
279         struct zfcp_dbf_pay             pay_buf;
280         struct zfcp_dbf_rec             rec_buf;
281         struct zfcp_dbf_hba             hba_buf;
282         struct zfcp_dbf_san             san_buf;
283         struct zfcp_dbf_scsi            scsi_buf;
284 };
285
286 /**
287  * zfcp_dbf_hba_fsf_resp_suppress - true if we should not trace by default
288  * @req: request that has been completed
289  *
290  * Returns true if FCP response with only benign residual under count.
291  */
292 static inline
293 bool zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req *req)
294 {
295         struct fsf_qtcb *qtcb = req->qtcb;
296         u32 fsf_stat = qtcb->header.fsf_status;
297         struct fcp_resp *fcp_rsp;
298         u8 rsp_flags, fr_status;
299
300         if (qtcb->prefix.qtcb_type != FSF_IO_COMMAND)
301                 return false; /* not an FCP response */
302         fcp_rsp = (struct fcp_resp *)&qtcb->bottom.io.fcp_rsp;
303         rsp_flags = fcp_rsp->fr_flags;
304         fr_status = fcp_rsp->fr_status;
305         return (fsf_stat == FSF_FCP_RSP_AVAILABLE) &&
306                 (rsp_flags == FCP_RESID_UNDER) &&
307                 (fr_status == SAM_STAT_GOOD);
308 }
309
310 static inline
311 void zfcp_dbf_hba_fsf_resp(char *tag, int level, struct zfcp_fsf_req *req)
312 {
313         if (debug_level_enabled(req->adapter->dbf->hba, level))
314                 zfcp_dbf_hba_fsf_res(tag, level, req);
315 }
316
317 /**
318  * zfcp_dbf_hba_fsf_response - trace event for request completion
319  * @req: request that has been completed
320  */
321 static inline
322 void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req)
323 {
324         struct fsf_qtcb *qtcb = req->qtcb;
325
326         if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
327             (qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
328                 zfcp_dbf_hba_fsf_resp("fs_perr", 1, req);
329
330         } else if (qtcb->header.fsf_status != FSF_GOOD) {
331                 zfcp_dbf_hba_fsf_resp("fs_ferr",
332                                       zfcp_dbf_hba_fsf_resp_suppress(req)
333                                       ? 5 : 1, req);
334
335         } else if ((req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
336                    (req->fsf_command == FSF_QTCB_OPEN_LUN)) {
337                 zfcp_dbf_hba_fsf_resp("fs_open", 4, req);
338
339         } else if (qtcb->header.log_length) {
340                 zfcp_dbf_hba_fsf_resp("fs_qtcb", 5, req);
341
342         } else {
343                 zfcp_dbf_hba_fsf_resp("fs_norm", 6, req);
344         }
345 }
346
347 static inline
348 void _zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *scmd,
349                    struct zfcp_fsf_req *req)
350 {
351         struct zfcp_adapter *adapter = (struct zfcp_adapter *)
352                                         scmd->device->host->hostdata[0];
353
354         if (debug_level_enabled(adapter->dbf->scsi, level))
355                 zfcp_dbf_scsi(tag, level, scmd, req);
356 }
357
358 /**
359  * zfcp_dbf_scsi_result - trace event for SCSI command completion
360  * @scmd: SCSI command pointer
361  * @req: FSF request used to issue SCSI command
362  */
363 static inline
364 void zfcp_dbf_scsi_result(struct scsi_cmnd *scmd, struct zfcp_fsf_req *req)
365 {
366         if (scmd->result != 0)
367                 _zfcp_dbf_scsi("rsl_err", 3, scmd, req);
368         else if (scmd->retries > 0)
369                 _zfcp_dbf_scsi("rsl_ret", 4, scmd, req);
370         else
371                 _zfcp_dbf_scsi("rsl_nor", 6, scmd, req);
372 }
373
374 /**
375  * zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command
376  * @scmd: SCSI command pointer
377  */
378 static inline
379 void zfcp_dbf_scsi_fail_send(struct scsi_cmnd *scmd)
380 {
381         _zfcp_dbf_scsi("rsl_fai", 4, scmd, NULL);
382 }
383
384 /**
385  * zfcp_dbf_scsi_abort - trace event for SCSI command abort
386  * @tag: tag indicating success or failure of abort operation
387  * @scmd: SCSI command to be aborted
388  * @fsf_req: request containing abort (might be NULL)
389  */
390 static inline
391 void zfcp_dbf_scsi_abort(char *tag, struct scsi_cmnd *scmd,
392                          struct zfcp_fsf_req *fsf_req)
393 {
394         _zfcp_dbf_scsi(tag, 1, scmd, fsf_req);
395 }
396
397 /**
398  * zfcp_dbf_scsi_devreset - trace event for Logical Unit or Target Reset
399  * @tag: tag indicating success or failure of reset operation
400  * @scmnd: SCSI command which caused this error recovery
401  * @flag: indicates type of reset (Target Reset, Logical Unit Reset)
402  */
403 static inline
404 void zfcp_dbf_scsi_devreset(char *tag, struct scsi_cmnd *scmnd, u8 flag)
405 {
406         char tmp_tag[ZFCP_DBF_TAG_LEN];
407
408         if (flag == FCP_TMF_TGT_RESET)
409                 memcpy(tmp_tag, "tr_", 3);
410         else
411                 memcpy(tmp_tag, "lr_", 3);
412
413         memcpy(&tmp_tag[3], tag, 4);
414         _zfcp_dbf_scsi(tmp_tag, 1, scmnd, NULL);
415 }
416
417 /**
418  * zfcp_dbf_scsi_nullcmnd() - trace NULLify of SCSI command in dev/tgt-reset.
419  * @scmnd: SCSI command that was NULLified.
420  * @fsf_req: request that owned @scmnd.
421  */
422 static inline void zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd *scmnd,
423                                           struct zfcp_fsf_req *fsf_req)
424 {
425         _zfcp_dbf_scsi("scfc__1", 3, scmnd, fsf_req);
426 }
427
428 #endif /* ZFCP_DBF_H */