1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * scsi_logging.c
4 *
5 * Copyright (C) 2014 SUSE Linux Products GmbH
6 * Copyright (C) 2014 Hannes Reinecke <hare@suse.de>
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/atomic.h>
11
12 #include <scsi/scsi.h>
13 #include <scsi/scsi_cmnd.h>
14 #include <scsi/scsi_device.h>
15 #include <scsi/scsi_eh.h>
16 #include <scsi/scsi_dbg.h>
17
scsi_log_reserve_buffer(size_t * len)18 static char *scsi_log_reserve_buffer(size_t *len)
19 {
20 *len = 128;
21 return kmalloc(*len, GFP_ATOMIC);
22 }
23
scsi_log_release_buffer(char * bufptr)24 static void scsi_log_release_buffer(char *bufptr)
25 {
26 kfree(bufptr);
27 }
28
scmd_name(const struct scsi_cmnd * scmd)29 static inline const char *scmd_name(const struct scsi_cmnd *scmd)
30 {
31 struct request *rq = scsi_cmd_to_rq((struct scsi_cmnd *)scmd);
32
33 if (!rq->q || !rq->q->disk)
34 return NULL;
35 return rq->q->disk->disk_name;
36 }
37
sdev_format_header(char * logbuf,size_t logbuf_len,const char * name,int tag)38 static size_t sdev_format_header(char *logbuf, size_t logbuf_len,
39 const char *name, int tag)
40 {
41 size_t off = 0;
42
43 if (name)
44 off += scnprintf(logbuf + off, logbuf_len - off,
45 "[%s] ", name);
46
47 if (WARN_ON(off >= logbuf_len))
48 return off;
49
50 if (tag >= 0)
51 off += scnprintf(logbuf + off, logbuf_len - off,
52 "tag#%d ", tag);
53 return off;
54 }
55
sdev_prefix_printk(const char * level,const struct scsi_device * sdev,const char * name,const char * fmt,...)56 void sdev_prefix_printk(const char *level, const struct scsi_device *sdev,
57 const char *name, const char *fmt, ...)
58 {
59 va_list args;
60 char *logbuf;
61 size_t off = 0, logbuf_len;
62
63 if (!sdev)
64 return;
65
66 logbuf = scsi_log_reserve_buffer(&logbuf_len);
67 if (!logbuf)
68 return;
69
70 if (name)
71 off += scnprintf(logbuf + off, logbuf_len - off,
72 "[%s] ", name);
73 if (!WARN_ON(off >= logbuf_len)) {
74 va_start(args, fmt);
75 off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
76 va_end(args);
77 }
78 dev_printk(level, &sdev->sdev_gendev, "%s", logbuf);
79 scsi_log_release_buffer(logbuf);
80 }
81 EXPORT_SYMBOL(sdev_prefix_printk);
82
scmd_printk(const char * level,const struct scsi_cmnd * scmd,const char * fmt,...)83 void scmd_printk(const char *level, const struct scsi_cmnd *scmd,
84 const char *fmt, ...)
85 {
86 va_list args;
87 char *logbuf;
88 size_t off = 0, logbuf_len;
89
90 if (!scmd)
91 return;
92
93 logbuf = scsi_log_reserve_buffer(&logbuf_len);
94 if (!logbuf)
95 return;
96 off = sdev_format_header(logbuf, logbuf_len, scmd_name(scmd),
97 scsi_cmd_to_rq((struct scsi_cmnd *)scmd)->tag);
98 if (off < logbuf_len) {
99 va_start(args, fmt);
100 off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args);
101 va_end(args);
102 }
103 dev_printk(level, &scmd->device->sdev_gendev, "%s", logbuf);
104 scsi_log_release_buffer(logbuf);
105 }
106 EXPORT_SYMBOL(scmd_printk);
107
scsi_format_opcode_name(char * buffer,size_t buf_len,const unsigned char * cdbp)108 static size_t scsi_format_opcode_name(char *buffer, size_t buf_len,
109 const unsigned char *cdbp)
110 {
111 int sa, cdb0;
112 const char *cdb_name = NULL, *sa_name = NULL;
113 size_t off;
114
115 cdb0 = cdbp[0];
116 if (cdb0 == VARIABLE_LENGTH_CMD) {
117 int len = scsi_varlen_cdb_length(cdbp);
118
119 if (len < 10) {
120 off = scnprintf(buffer, buf_len,
121 "short variable length command, len=%d",
122 len);
123 return off;
124 }
125 sa = (cdbp[8] << 8) + cdbp[9];
126 } else
127 sa = cdbp[1] & 0x1f;
128
129 if (!scsi_opcode_sa_name(cdb0, sa, &cdb_name, &sa_name)) {
130 if (cdb_name)
131 off = scnprintf(buffer, buf_len, "%s", cdb_name);
132 else {
133 off = scnprintf(buffer, buf_len, "opcode=0x%x", cdb0);
134 if (WARN_ON(off >= buf_len))
135 return off;
136 if (cdb0 >= VENDOR_SPECIFIC_CDB)
137 off += scnprintf(buffer + off, buf_len - off,
138 " (vendor)");
139 else if (cdb0 >= 0x60 && cdb0 < 0x7e)
140 off += scnprintf(buffer + off, buf_len - off,
141 " (reserved)");
142 }
143 } else {
144 if (sa_name)
145 off = scnprintf(buffer, buf_len, "%s", sa_name);
146 else if (cdb_name)
147 off = scnprintf(buffer, buf_len, "%s, sa=0x%x",
148 cdb_name, sa);
149 else
150 off = scnprintf(buffer, buf_len,
151 "opcode=0x%x, sa=0x%x", cdb0, sa);
152 }
153 WARN_ON(off >= buf_len);
154 return off;
155 }
156
__scsi_format_command(char * logbuf,size_t logbuf_len,const unsigned char * cdb,size_t cdb_len)157 size_t __scsi_format_command(char *logbuf, size_t logbuf_len,
158 const unsigned char *cdb, size_t cdb_len)
159 {
160 int len, k;
161 size_t off;
162
163 off = scsi_format_opcode_name(logbuf, logbuf_len, cdb);
164 if (off >= logbuf_len)
165 return off;
166 len = scsi_command_size(cdb);
167 if (cdb_len < len)
168 len = cdb_len;
169 /* print out all bytes in cdb */
170 for (k = 0; k < len; ++k) {
171 if (off > logbuf_len - 3)
172 break;
173 off += scnprintf(logbuf + off, logbuf_len - off,
174 " %02x", cdb[k]);
175 }
176 return off;
177 }
178 EXPORT_SYMBOL(__scsi_format_command);
179
scsi_print_command(struct scsi_cmnd * cmd)180 void scsi_print_command(struct scsi_cmnd *cmd)
181 {
182 int k;
183 char *logbuf;
184 size_t off, logbuf_len;
185
186 logbuf = scsi_log_reserve_buffer(&logbuf_len);
187 if (!logbuf)
188 return;
189
190 off = sdev_format_header(logbuf, logbuf_len,
191 scmd_name(cmd), scsi_cmd_to_rq(cmd)->tag);
192 if (off >= logbuf_len)
193 goto out_printk;
194 off += scnprintf(logbuf + off, logbuf_len - off, "CDB: ");
195 if (WARN_ON(off >= logbuf_len))
196 goto out_printk;
197
198 off += scsi_format_opcode_name(logbuf + off, logbuf_len - off,
199 cmd->cmnd);
200 if (off >= logbuf_len)
201 goto out_printk;
202
203 /* print out all bytes in cdb */
204 if (cmd->cmd_len > 16) {
205 /* Print opcode in one line and use separate lines for CDB */
206 off += scnprintf(logbuf + off, logbuf_len - off, "\n");
207 dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
208 for (k = 0; k < cmd->cmd_len; k += 16) {
209 size_t linelen = min(cmd->cmd_len - k, 16);
210
211 off = sdev_format_header(logbuf, logbuf_len,
212 scmd_name(cmd),
213 scsi_cmd_to_rq(cmd)->tag);
214 if (!WARN_ON(off > logbuf_len - 58)) {
215 off += scnprintf(logbuf + off, logbuf_len - off,
216 "CDB[%02x]: ", k);
217 hex_dump_to_buffer(&cmd->cmnd[k], linelen,
218 16, 1, logbuf + off,
219 logbuf_len - off, false);
220 }
221 dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s",
222 logbuf);
223 }
224 goto out;
225 }
226 if (!WARN_ON(off > logbuf_len - 49)) {
227 off += scnprintf(logbuf + off, logbuf_len - off, " ");
228 hex_dump_to_buffer(cmd->cmnd, cmd->cmd_len, 16, 1,
229 logbuf + off, logbuf_len - off,
230 false);
231 }
232 out_printk:
233 dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
234 out:
235 scsi_log_release_buffer(logbuf);
236 }
237 EXPORT_SYMBOL(scsi_print_command);
238
239 static size_t
scsi_format_extd_sense(char * buffer,size_t buf_len,unsigned char asc,unsigned char ascq)240 scsi_format_extd_sense(char *buffer, size_t buf_len,
241 unsigned char asc, unsigned char ascq)
242 {
243 size_t off = 0;
244 const char *extd_sense_fmt = NULL;
245 const char *extd_sense_str = scsi_extd_sense_format(asc, ascq,
246 &extd_sense_fmt);
247
248 if (extd_sense_str) {
249 off = scnprintf(buffer, buf_len, "Add. Sense: %s",
250 extd_sense_str);
251 if (extd_sense_fmt)
252 off += scnprintf(buffer + off, buf_len - off,
253 "(%s%x)", extd_sense_fmt, ascq);
254 } else {
255 if (asc >= 0x80)
256 off = scnprintf(buffer, buf_len, "<<vendor>>");
257 off += scnprintf(buffer + off, buf_len - off,
258 "ASC=0x%x ", asc);
259 if (ascq >= 0x80)
260 off += scnprintf(buffer + off, buf_len - off,
261 "<<vendor>>");
262 off += scnprintf(buffer + off, buf_len - off,
263 "ASCQ=0x%x ", ascq);
264 }
265 return off;
266 }
267
268 static size_t
scsi_format_sense_hdr(char * buffer,size_t buf_len,const struct scsi_sense_hdr * sshdr)269 scsi_format_sense_hdr(char *buffer, size_t buf_len,
270 const struct scsi_sense_hdr *sshdr)
271 {
272 const char *sense_txt;
273 size_t off;
274
275 off = scnprintf(buffer, buf_len, "Sense Key : ");
276 sense_txt = scsi_sense_key_string(sshdr->sense_key);
277 if (sense_txt)
278 off += scnprintf(buffer + off, buf_len - off,
279 "%s ", sense_txt);
280 else
281 off += scnprintf(buffer + off, buf_len - off,
282 "0x%x ", sshdr->sense_key);
283 off += scnprintf(buffer + off, buf_len - off,
284 scsi_sense_is_deferred(sshdr) ? "[deferred] " : "[current] ");
285
286 if (sshdr->response_code >= 0x72)
287 off += scnprintf(buffer + off, buf_len - off, "[descriptor] ");
288 return off;
289 }
290
291 static void
scsi_log_dump_sense(const struct scsi_device * sdev,const char * name,int tag,const unsigned char * sense_buffer,int sense_len)292 scsi_log_dump_sense(const struct scsi_device *sdev, const char *name, int tag,
293 const unsigned char *sense_buffer, int sense_len)
294 {
295 char *logbuf;
296 size_t logbuf_len;
297 int i;
298
299 logbuf = scsi_log_reserve_buffer(&logbuf_len);
300 if (!logbuf)
301 return;
302
303 for (i = 0; i < sense_len; i += 16) {
304 int len = min(sense_len - i, 16);
305 size_t off;
306
307 off = sdev_format_header(logbuf, logbuf_len,
308 name, tag);
309 hex_dump_to_buffer(&sense_buffer[i], len, 16, 1,
310 logbuf + off, logbuf_len - off,
311 false);
312 dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
313 }
314 scsi_log_release_buffer(logbuf);
315 }
316
317 static void
scsi_log_print_sense_hdr(const struct scsi_device * sdev,const char * name,int tag,const struct scsi_sense_hdr * sshdr)318 scsi_log_print_sense_hdr(const struct scsi_device *sdev, const char *name,
319 int tag, const struct scsi_sense_hdr *sshdr)
320 {
321 char *logbuf;
322 size_t off, logbuf_len;
323
324 logbuf = scsi_log_reserve_buffer(&logbuf_len);
325 if (!logbuf)
326 return;
327 off = sdev_format_header(logbuf, logbuf_len, name, tag);
328 off += scsi_format_sense_hdr(logbuf + off, logbuf_len - off, sshdr);
329 dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
330 scsi_log_release_buffer(logbuf);
331
332 logbuf = scsi_log_reserve_buffer(&logbuf_len);
333 if (!logbuf)
334 return;
335 off = sdev_format_header(logbuf, logbuf_len, name, tag);
336 off += scsi_format_extd_sense(logbuf + off, logbuf_len - off,
337 sshdr->asc, sshdr->ascq);
338 dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
339 scsi_log_release_buffer(logbuf);
340 }
341
342 static void
scsi_log_print_sense(const struct scsi_device * sdev,const char * name,int tag,const unsigned char * sense_buffer,int sense_len)343 scsi_log_print_sense(const struct scsi_device *sdev, const char *name, int tag,
344 const unsigned char *sense_buffer, int sense_len)
345 {
346 struct scsi_sense_hdr sshdr;
347
348 if (scsi_normalize_sense(sense_buffer, sense_len, &sshdr))
349 scsi_log_print_sense_hdr(sdev, name, tag, &sshdr);
350 else
351 scsi_log_dump_sense(sdev, name, tag, sense_buffer, sense_len);
352 }
353
354 /*
355 * Print normalized SCSI sense header with a prefix.
356 */
357 void
scsi_print_sense_hdr(const struct scsi_device * sdev,const char * name,const struct scsi_sense_hdr * sshdr)358 scsi_print_sense_hdr(const struct scsi_device *sdev, const char *name,
359 const struct scsi_sense_hdr *sshdr)
360 {
361 scsi_log_print_sense_hdr(sdev, name, -1, sshdr);
362 }
363 EXPORT_SYMBOL(scsi_print_sense_hdr);
364
365 /* Normalize and print sense buffer with name prefix */
__scsi_print_sense(const struct scsi_device * sdev,const char * name,const unsigned char * sense_buffer,int sense_len)366 void __scsi_print_sense(const struct scsi_device *sdev, const char *name,
367 const unsigned char *sense_buffer, int sense_len)
368 {
369 scsi_log_print_sense(sdev, name, -1, sense_buffer, sense_len);
370 }
371 EXPORT_SYMBOL(__scsi_print_sense);
372
373 /* Normalize and print sense buffer in SCSI command */
scsi_print_sense(const struct scsi_cmnd * cmd)374 void scsi_print_sense(const struct scsi_cmnd *cmd)
375 {
376 scsi_log_print_sense(cmd->device, scmd_name(cmd),
377 scsi_cmd_to_rq((struct scsi_cmnd *)cmd)->tag,
378 cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
379 }
380 EXPORT_SYMBOL(scsi_print_sense);
381
scsi_print_result(const struct scsi_cmnd * cmd,const char * msg,int disposition)382 void scsi_print_result(const struct scsi_cmnd *cmd, const char *msg,
383 int disposition)
384 {
385 char *logbuf;
386 size_t off, logbuf_len;
387 const char *mlret_string = scsi_mlreturn_string(disposition);
388 const char *hb_string = scsi_hostbyte_string(cmd->result);
389 unsigned long cmd_age = (jiffies - cmd->jiffies_at_alloc) / HZ;
390
391 logbuf = scsi_log_reserve_buffer(&logbuf_len);
392 if (!logbuf)
393 return;
394
395 off = sdev_format_header(logbuf, logbuf_len, scmd_name(cmd),
396 scsi_cmd_to_rq((struct scsi_cmnd *)cmd)->tag);
397
398 if (off >= logbuf_len)
399 goto out_printk;
400
401 if (msg) {
402 off += scnprintf(logbuf + off, logbuf_len - off,
403 "%s: ", msg);
404 if (WARN_ON(off >= logbuf_len))
405 goto out_printk;
406 }
407 if (mlret_string)
408 off += scnprintf(logbuf + off, logbuf_len - off,
409 "%s ", mlret_string);
410 else
411 off += scnprintf(logbuf + off, logbuf_len - off,
412 "UNKNOWN(0x%02x) ", disposition);
413 if (WARN_ON(off >= logbuf_len))
414 goto out_printk;
415
416 off += scnprintf(logbuf + off, logbuf_len - off, "Result: ");
417 if (WARN_ON(off >= logbuf_len))
418 goto out_printk;
419
420 if (hb_string)
421 off += scnprintf(logbuf + off, logbuf_len - off,
422 "hostbyte=%s ", hb_string);
423 else
424 off += scnprintf(logbuf + off, logbuf_len - off,
425 "hostbyte=0x%02x ", host_byte(cmd->result));
426 if (WARN_ON(off >= logbuf_len))
427 goto out_printk;
428
429 off += scnprintf(logbuf + off, logbuf_len - off,
430 "driverbyte=DRIVER_OK ");
431
432 off += scnprintf(logbuf + off, logbuf_len - off,
433 "cmd_age=%lus", cmd_age);
434
435 out_printk:
436 dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
437 scsi_log_release_buffer(logbuf);
438 }
439 EXPORT_SYMBOL(scsi_print_result);
440