[SCSI] zfcp: Issue FCP command without holding SCSI host_lock
[linux-2.6.git] / drivers / s390 / scsi / zfcp_dbf.h
1 /*
2  * This file is part of the zfcp device driver for
3  * FCP adapters for IBM System z9 and zSeries.
4  *
5  * Copyright IBM Corp. 2008, 2009
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20  */
21
22 #ifndef ZFCP_DBF_H
23 #define ZFCP_DBF_H
24
25 #include <scsi/fc/fc_fcp.h>
26 #include "zfcp_ext.h"
27 #include "zfcp_fsf.h"
28 #include "zfcp_def.h"
29
30 #define ZFCP_DBF_TAG_SIZE      4
31 #define ZFCP_DBF_ID_SIZE       7
32
33 #define ZFCP_DBF_INVALID_LUN    0xFFFFFFFFFFFFFFFFull
34
35 struct zfcp_dbf_dump {
36         u8 tag[ZFCP_DBF_TAG_SIZE];
37         u32 total_size;         /* size of total dump data */
38         u32 offset;             /* how much data has being already dumped */
39         u32 size;               /* how much data comes with this record */
40         u8 data[];              /* dump data */
41 } __attribute__ ((packed));
42
43 struct zfcp_dbf_rec_record_thread {
44         u32 total;
45         u32 ready;
46         u32 running;
47 };
48
49 struct zfcp_dbf_rec_record_target {
50         u64 ref;
51         u32 status;
52         u32 d_id;
53         u64 wwpn;
54         u64 fcp_lun;
55         u32 erp_count;
56 };
57
58 struct zfcp_dbf_rec_record_trigger {
59         u8 want;
60         u8 need;
61         u32 as;
62         u32 ps;
63         u32 ls;
64         u64 ref;
65         u64 action;
66         u64 wwpn;
67         u64 fcp_lun;
68 };
69
70 struct zfcp_dbf_rec_record_action {
71         u32 status;
72         u32 step;
73         u64 action;
74         u64 fsf_req;
75 };
76
77 struct zfcp_dbf_rec_record {
78         u8 id;
79         char id2[7];
80         union {
81                 struct zfcp_dbf_rec_record_action action;
82                 struct zfcp_dbf_rec_record_thread thread;
83                 struct zfcp_dbf_rec_record_target target;
84                 struct zfcp_dbf_rec_record_trigger trigger;
85         } u;
86 };
87
88 enum {
89         ZFCP_REC_DBF_ID_ACTION,
90         ZFCP_REC_DBF_ID_THREAD,
91         ZFCP_REC_DBF_ID_TARGET,
92         ZFCP_REC_DBF_ID_TRIGGER,
93 };
94
95 struct zfcp_dbf_hba_record_response {
96         u32 fsf_command;
97         u64 fsf_reqid;
98         u32 fsf_seqno;
99         u64 fsf_issued;
100         u32 fsf_prot_status;
101         u32 fsf_status;
102         u8 fsf_prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
103         u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
104         u32 fsf_req_status;
105         u8 sbal_first;
106         u8 sbal_last;
107         u8 sbal_response;
108         u8 pool;
109         u64 erp_action;
110         union {
111                 struct {
112                         u64 cmnd;
113                         u32 data_dir;
114                 } fcp;
115                 struct {
116                         u64 wwpn;
117                         u32 d_id;
118                         u32 port_handle;
119                 } port;
120                 struct {
121                         u64 wwpn;
122                         u64 fcp_lun;
123                         u32 port_handle;
124                         u32 lun_handle;
125                 } unit;
126                 struct {
127                         u32 d_id;
128                 } els;
129         } u;
130 } __attribute__ ((packed));
131
132 struct zfcp_dbf_hba_record_status {
133         u8 failed;
134         u32 status_type;
135         u32 status_subtype;
136         struct fsf_queue_designator
137          queue_designator;
138         u32 payload_size;
139 #define ZFCP_DBF_UNSOL_PAYLOAD                          80
140 #define ZFCP_DBF_UNSOL_PAYLOAD_SENSE_DATA_AVAIL         32
141 #define ZFCP_DBF_UNSOL_PAYLOAD_BIT_ERROR_THRESHOLD      56
142 #define ZFCP_DBF_UNSOL_PAYLOAD_FEATURE_UPDATE_ALERT     2 * sizeof(u32)
143         u8 payload[ZFCP_DBF_UNSOL_PAYLOAD];
144 } __attribute__ ((packed));
145
146 struct zfcp_dbf_hba_record_qdio {
147         u32 qdio_error;
148         u8 sbal_index;
149         u8 sbal_count;
150 } __attribute__ ((packed));
151
152 struct zfcp_dbf_hba_record {
153         u8 tag[ZFCP_DBF_TAG_SIZE];
154         u8 tag2[ZFCP_DBF_TAG_SIZE];
155         union {
156                 struct zfcp_dbf_hba_record_response response;
157                 struct zfcp_dbf_hba_record_status status;
158                 struct zfcp_dbf_hba_record_qdio qdio;
159                 struct fsf_bit_error_payload berr;
160         } u;
161 } __attribute__ ((packed));
162
163 struct zfcp_dbf_san_record_ct_request {
164         u16 cmd_req_code;
165         u8 revision;
166         u8 gs_type;
167         u8 gs_subtype;
168         u8 options;
169         u16 max_res_size;
170         u32 len;
171         u32 d_id;
172 } __attribute__ ((packed));
173
174 struct zfcp_dbf_san_record_ct_response {
175         u16 cmd_rsp_code;
176         u8 revision;
177         u8 reason_code;
178         u8 expl;
179         u8 vendor_unique;
180         u16 max_res_size;
181         u32 len;
182 } __attribute__ ((packed));
183
184 struct zfcp_dbf_san_record_els {
185         u32 d_id;
186 } __attribute__ ((packed));
187
188 struct zfcp_dbf_san_record {
189         u8 tag[ZFCP_DBF_TAG_SIZE];
190         u64 fsf_reqid;
191         u32 fsf_seqno;
192         union {
193                 struct zfcp_dbf_san_record_ct_request ct_req;
194                 struct zfcp_dbf_san_record_ct_response ct_resp;
195                 struct zfcp_dbf_san_record_els els;
196         } u;
197 } __attribute__ ((packed));
198
199 #define ZFCP_DBF_SAN_MAX_PAYLOAD 1024
200
201 struct zfcp_dbf_scsi_record {
202         u8 tag[ZFCP_DBF_TAG_SIZE];
203         u8 tag2[ZFCP_DBF_TAG_SIZE];
204         u32 scsi_id;
205         u32 scsi_lun;
206         u32 scsi_result;
207         u64 scsi_cmnd;
208 #define ZFCP_DBF_SCSI_OPCODE    16
209         u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
210         u8 scsi_retries;
211         u8 scsi_allowed;
212         u64 fsf_reqid;
213         u32 fsf_seqno;
214         u64 fsf_issued;
215         u64 old_fsf_reqid;
216         u8 rsp_validity;
217         u8 rsp_scsi_status;
218         u32 rsp_resid;
219         u8 rsp_code;
220 #define ZFCP_DBF_SCSI_FCP_SNS_INFO      16
221 #define ZFCP_DBF_SCSI_MAX_FCP_SNS_INFO  256
222         u32 sns_info_len;
223         u8 sns_info[ZFCP_DBF_SCSI_FCP_SNS_INFO];
224 } __attribute__ ((packed));
225
226 struct zfcp_dbf {
227         debug_info_t                    *rec;
228         debug_info_t                    *hba;
229         debug_info_t                    *san;
230         debug_info_t                    *scsi;
231         spinlock_t                      rec_lock;
232         spinlock_t                      hba_lock;
233         spinlock_t                      san_lock;
234         spinlock_t                      scsi_lock;
235         struct zfcp_dbf_rec_record      rec_buf;
236         struct zfcp_dbf_hba_record      hba_buf;
237         struct zfcp_dbf_san_record      san_buf;
238         struct zfcp_dbf_scsi_record     scsi_buf;
239         struct zfcp_adapter             *adapter;
240 };
241
242 static inline
243 void zfcp_dbf_hba_fsf_resp(const char *tag2, int level,
244                            struct zfcp_fsf_req *req, struct zfcp_dbf *dbf)
245 {
246         if (level <= dbf->hba->level)
247                 _zfcp_dbf_hba_fsf_response(tag2, level, req, dbf);
248 }
249
250 /**
251  * zfcp_dbf_hba_fsf_response - trace event for request completion
252  * @fsf_req: request that has been completed
253  */
254 static inline void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req)
255 {
256         struct zfcp_dbf *dbf = req->adapter->dbf;
257         struct fsf_qtcb *qtcb = req->qtcb;
258
259         if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
260             (qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
261                 zfcp_dbf_hba_fsf_resp("perr", 1, req, dbf);
262
263         } else if (qtcb->header.fsf_status != FSF_GOOD) {
264                 zfcp_dbf_hba_fsf_resp("ferr", 1, req, dbf);
265
266         } else if ((req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
267                    (req->fsf_command == FSF_QTCB_OPEN_LUN)) {
268                 zfcp_dbf_hba_fsf_resp("open", 4, req, dbf);
269
270         } else if (qtcb->header.log_length) {
271                 zfcp_dbf_hba_fsf_resp("qtcb", 5, req, dbf);
272
273         } else {
274                 zfcp_dbf_hba_fsf_resp("norm", 6, req, dbf);
275         }
276  }
277
278 /**
279  * zfcp_dbf_hba_fsf_unsol - trace event for an unsolicited status buffer
280  * @tag: tag indicating which kind of unsolicited status has been received
281  * @dbf: reference to dbf structure
282  * @status_buffer: buffer containing payload of unsolicited status
283  */
284 static inline
285 void zfcp_dbf_hba_fsf_unsol(const char *tag, struct zfcp_dbf *dbf,
286                             struct fsf_status_read_buffer *buf)
287 {
288         int level = 2;
289
290         if (level <= dbf->hba->level)
291                 _zfcp_dbf_hba_fsf_unsol(tag, level, dbf, buf);
292 }
293
294 static inline
295 void zfcp_dbf_scsi(const char *tag, const char *tag2, int level,
296                    struct zfcp_dbf *dbf, struct scsi_cmnd *scmd,
297                    struct zfcp_fsf_req *req, unsigned long old_id)
298 {
299         if (level <= dbf->scsi->level)
300                 _zfcp_dbf_scsi(tag, tag2, level, dbf, scmd, req, old_id);
301 }
302
303 /**
304  * zfcp_dbf_scsi_result - trace event for SCSI command completion
305  * @dbf: adapter dbf trace
306  * @scmd: SCSI command pointer
307  * @req: FSF request used to issue SCSI command
308  */
309 static inline
310 void zfcp_dbf_scsi_result(struct zfcp_dbf *dbf, struct scsi_cmnd *scmd,
311                           struct zfcp_fsf_req *req)
312 {
313         if (scmd->result != 0)
314                 zfcp_dbf_scsi("rslt", "erro", 3, dbf, scmd, req, 0);
315         else if (scmd->retries > 0)
316                 zfcp_dbf_scsi("rslt", "retr", 4, dbf, scmd, req, 0);
317         else
318                 zfcp_dbf_scsi("rslt", "norm", 6, dbf, scmd, req, 0);
319 }
320
321 /**
322  * zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command
323  * @dbf: adapter dbf trace
324  * @scmd: SCSI command pointer
325  */
326 static inline
327 void zfcp_dbf_scsi_fail_send(struct zfcp_dbf *dbf, struct scsi_cmnd *scmd)
328 {
329         zfcp_dbf_scsi("rslt", "fail", 4, dbf, scmd, NULL, 0);
330 }
331
332 /**
333  * zfcp_dbf_scsi_abort - trace event for SCSI command abort
334  * @tag: tag indicating success or failure of abort operation
335  * @adapter: adapter thas has been used to issue SCSI command to be aborted
336  * @scmd: SCSI command to be aborted
337  * @new_req: request containing abort (might be NULL)
338  * @old_id: identifier of request containg SCSI command to be aborted
339  */
340 static inline
341 void zfcp_dbf_scsi_abort(const char *tag, struct zfcp_dbf *dbf,
342                          struct scsi_cmnd *scmd, struct zfcp_fsf_req *new_req,
343                          unsigned long old_id)
344 {
345         zfcp_dbf_scsi("abrt", tag, 1, dbf, scmd, new_req, old_id);
346 }
347
348 /**
349  * zfcp_dbf_scsi_devreset - trace event for Logical Unit or Target Reset
350  * @tag: tag indicating success or failure of reset operation
351  * @scmnd: SCSI command which caused this error recovery
352  * @flag: indicates type of reset (Target Reset, Logical Unit Reset)
353  */
354 static inline
355 void zfcp_dbf_scsi_devreset(const char *tag, struct scsi_cmnd *scmnd, u8 flag)
356 {
357         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scmnd->device);
358
359         zfcp_dbf_scsi(flag == FCP_TMF_TGT_RESET ? "trst" : "lrst", tag, 1,
360                       zfcp_sdev->port->adapter->dbf, scmnd, NULL, 0);
361 }
362
363 #endif /* ZFCP_DBF_H */