]>
Commit | Line | Data |
---|---|---|
ded85c19 HR |
1 | /* |
2 | * scsi_logging.c | |
3 | * | |
4 | * Copyright (C) 2014 SUSE Linux Products GmbH | |
5 | * Copyright (C) 2014 Hannes Reinecke <hare@suse.de> | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/atomic.h> | |
12 | ||
13 | #include <scsi/scsi.h> | |
14 | #include <scsi/scsi_cmnd.h> | |
15 | #include <scsi/scsi_device.h> | |
9e5ed2a5 | 16 | #include <scsi/scsi_eh.h> |
ded85c19 HR |
17 | #include <scsi/scsi_dbg.h> |
18 | ||
19 | #define SCSI_LOG_SPOOLSIZE 4096 | |
ded85c19 HR |
20 | |
21 | #if (SCSI_LOG_SPOOLSIZE / SCSI_LOG_BUFSIZE) > BITS_PER_LONG | |
22 | #warning SCSI logging bitmask too large | |
23 | #endif | |
24 | ||
25 | struct scsi_log_buf { | |
26 | char buffer[SCSI_LOG_SPOOLSIZE]; | |
27 | unsigned long map; | |
28 | }; | |
29 | ||
30 | static DEFINE_PER_CPU(struct scsi_log_buf, scsi_format_log); | |
31 | ||
32 | static char *scsi_log_reserve_buffer(size_t *len) | |
33 | { | |
34 | struct scsi_log_buf *buf; | |
35 | unsigned long map_bits = sizeof(buf->buffer) / SCSI_LOG_BUFSIZE; | |
36 | unsigned long idx = 0; | |
37 | ||
38 | preempt_disable(); | |
39 | buf = this_cpu_ptr(&scsi_format_log); | |
40 | idx = find_first_zero_bit(&buf->map, map_bits); | |
41 | if (likely(idx < map_bits)) { | |
42 | while (test_and_set_bit(idx, &buf->map)) { | |
43 | idx = find_next_zero_bit(&buf->map, map_bits, idx); | |
44 | if (idx >= map_bits) | |
45 | break; | |
46 | } | |
47 | } | |
48 | if (WARN_ON(idx >= map_bits)) { | |
49 | preempt_enable(); | |
50 | return NULL; | |
51 | } | |
52 | *len = SCSI_LOG_BUFSIZE; | |
53 | return buf->buffer + idx * SCSI_LOG_BUFSIZE; | |
54 | } | |
55 | ||
56 | static void scsi_log_release_buffer(char *bufptr) | |
57 | { | |
58 | struct scsi_log_buf *buf; | |
59 | unsigned long idx; | |
60 | int ret; | |
61 | ||
62 | buf = this_cpu_ptr(&scsi_format_log); | |
63 | if (bufptr >= buf->buffer && | |
64 | bufptr < buf->buffer + SCSI_LOG_SPOOLSIZE) { | |
65 | idx = (bufptr - buf->buffer) / SCSI_LOG_BUFSIZE; | |
66 | ret = test_and_clear_bit(idx, &buf->map); | |
67 | WARN_ON(!ret); | |
68 | } | |
69 | preempt_enable(); | |
70 | } | |
71 | ||
21045519 HR |
72 | static inline const char *scmd_name(const struct scsi_cmnd *scmd) |
73 | { | |
74 | return scmd->request->rq_disk ? | |
75 | scmd->request->rq_disk->disk_name : NULL; | |
76 | } | |
77 | ||
78 | static size_t sdev_format_header(char *logbuf, size_t logbuf_len, | |
79 | const char *name, int tag) | |
9e5ed2a5 HR |
80 | { |
81 | size_t off = 0; | |
82 | ||
21045519 | 83 | if (name) |
9e5ed2a5 | 84 | off += scnprintf(logbuf + off, logbuf_len - off, |
21045519 | 85 | "[%s] ", name); |
9e5ed2a5 HR |
86 | |
87 | if (WARN_ON(off >= logbuf_len)) | |
88 | return off; | |
89 | ||
90 | if (tag >= 0) | |
91 | off += scnprintf(logbuf + off, logbuf_len - off, | |
92 | "tag#%d ", tag); | |
93 | return off; | |
94 | } | |
95 | ||
ded85c19 HR |
96 | int sdev_prefix_printk(const char *level, const struct scsi_device *sdev, |
97 | const char *name, const char *fmt, ...) | |
98 | { | |
99 | va_list args; | |
100 | char *logbuf; | |
101 | size_t off = 0, logbuf_len; | |
102 | int ret; | |
103 | ||
104 | if (!sdev) | |
105 | return 0; | |
106 | ||
107 | logbuf = scsi_log_reserve_buffer(&logbuf_len); | |
108 | if (!logbuf) | |
109 | return 0; | |
110 | ||
111 | if (name) | |
112 | off += scnprintf(logbuf + off, logbuf_len - off, | |
113 | "[%s] ", name); | |
9e5ed2a5 HR |
114 | if (!WARN_ON(off >= logbuf_len)) { |
115 | va_start(args, fmt); | |
116 | off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args); | |
117 | va_end(args); | |
118 | } | |
ded85c19 HR |
119 | ret = dev_printk(level, &sdev->sdev_gendev, "%s", logbuf); |
120 | scsi_log_release_buffer(logbuf); | |
121 | return ret; | |
122 | } | |
123 | EXPORT_SYMBOL(sdev_prefix_printk); | |
124 | ||
125 | int scmd_printk(const char *level, const struct scsi_cmnd *scmd, | |
126 | const char *fmt, ...) | |
127 | { | |
ded85c19 HR |
128 | va_list args; |
129 | char *logbuf; | |
130 | size_t off = 0, logbuf_len; | |
131 | int ret; | |
132 | ||
133 | if (!scmd || !scmd->cmnd) | |
134 | return 0; | |
135 | ||
136 | logbuf = scsi_log_reserve_buffer(&logbuf_len); | |
137 | if (!logbuf) | |
138 | return 0; | |
21045519 | 139 | off = sdev_format_header(logbuf, logbuf_len, scmd_name(scmd), |
9e5ed2a5 HR |
140 | scmd->request->tag); |
141 | if (off < logbuf_len) { | |
142 | va_start(args, fmt); | |
143 | off += vscnprintf(logbuf + off, logbuf_len - off, fmt, args); | |
144 | va_end(args); | |
145 | } | |
ded85c19 HR |
146 | ret = dev_printk(level, &scmd->device->sdev_gendev, "%s", logbuf); |
147 | scsi_log_release_buffer(logbuf); | |
148 | return ret; | |
149 | } | |
150 | EXPORT_SYMBOL(scmd_printk); | |
9e5ed2a5 HR |
151 | |
152 | static size_t scsi_format_opcode_name(char *buffer, size_t buf_len, | |
153 | const unsigned char *cdbp) | |
154 | { | |
155 | int sa, cdb0; | |
156 | const char *cdb_name = NULL, *sa_name = NULL; | |
157 | size_t off; | |
158 | ||
159 | cdb0 = cdbp[0]; | |
160 | if (cdb0 == VARIABLE_LENGTH_CMD) { | |
161 | int len = scsi_varlen_cdb_length(cdbp); | |
162 | ||
163 | if (len < 10) { | |
164 | off = scnprintf(buffer, buf_len, | |
165 | "short variable length command, len=%d", | |
166 | len); | |
167 | return off; | |
168 | } | |
169 | sa = (cdbp[8] << 8) + cdbp[9]; | |
170 | } else | |
171 | sa = cdbp[1] & 0x1f; | |
172 | ||
173 | if (!scsi_opcode_sa_name(cdb0, sa, &cdb_name, &sa_name)) { | |
174 | if (cdb_name) | |
175 | off = scnprintf(buffer, buf_len, "%s", cdb_name); | |
176 | else { | |
177 | off = scnprintf(buffer, buf_len, "opcode=0x%x", cdb0); | |
178 | if (WARN_ON(off >= buf_len)) | |
179 | return off; | |
180 | if (cdb0 >= VENDOR_SPECIFIC_CDB) | |
181 | off += scnprintf(buffer + off, buf_len - off, | |
182 | " (vendor)"); | |
183 | else if (cdb0 >= 0x60 && cdb0 < 0x7e) | |
184 | off += scnprintf(buffer + off, buf_len - off, | |
185 | " (reserved)"); | |
186 | } | |
187 | } else { | |
188 | if (sa_name) | |
189 | off = scnprintf(buffer, buf_len, "%s", sa_name); | |
190 | else if (cdb_name) | |
191 | off = scnprintf(buffer, buf_len, "%s, sa=0x%x", | |
192 | cdb_name, sa); | |
193 | else | |
194 | off = scnprintf(buffer, buf_len, | |
195 | "opcode=0x%x, sa=0x%x", cdb0, sa); | |
196 | } | |
197 | WARN_ON(off >= buf_len); | |
198 | return off; | |
199 | } | |
200 | ||
201 | size_t __scsi_format_command(char *logbuf, size_t logbuf_len, | |
202 | const unsigned char *cdb, size_t cdb_len) | |
203 | { | |
204 | int len, k; | |
205 | size_t off; | |
206 | ||
207 | off = scsi_format_opcode_name(logbuf, logbuf_len, cdb); | |
208 | if (off >= logbuf_len) | |
209 | return off; | |
210 | len = scsi_command_size(cdb); | |
211 | if (cdb_len < len) | |
212 | len = cdb_len; | |
213 | /* print out all bytes in cdb */ | |
214 | for (k = 0; k < len; ++k) { | |
215 | if (off > logbuf_len - 3) | |
216 | break; | |
217 | off += scnprintf(logbuf + off, logbuf_len - off, | |
218 | " %02x", cdb[k]); | |
219 | } | |
220 | return off; | |
221 | } | |
222 | EXPORT_SYMBOL(__scsi_format_command); | |
223 | ||
224 | void scsi_print_command(struct scsi_cmnd *cmd) | |
225 | { | |
9e5ed2a5 HR |
226 | int k; |
227 | char *logbuf; | |
228 | size_t off, logbuf_len; | |
229 | ||
230 | if (!cmd->cmnd) | |
231 | return; | |
232 | ||
233 | logbuf = scsi_log_reserve_buffer(&logbuf_len); | |
234 | if (!logbuf) | |
235 | return; | |
236 | ||
21045519 HR |
237 | off = sdev_format_header(logbuf, logbuf_len, |
238 | scmd_name(cmd), cmd->request->tag); | |
9e5ed2a5 HR |
239 | if (off >= logbuf_len) |
240 | goto out_printk; | |
241 | off += scnprintf(logbuf + off, logbuf_len - off, "CDB: "); | |
242 | if (WARN_ON(off >= logbuf_len)) | |
243 | goto out_printk; | |
244 | ||
245 | off += scsi_format_opcode_name(logbuf + off, logbuf_len - off, | |
246 | cmd->cmnd); | |
247 | if (off >= logbuf_len) | |
248 | goto out_printk; | |
249 | ||
250 | /* print out all bytes in cdb */ | |
251 | if (cmd->cmd_len > 16) { | |
252 | /* Print opcode in one line and use separate lines for CDB */ | |
253 | off += scnprintf(logbuf + off, logbuf_len - off, "\n"); | |
254 | dev_printk(KERN_INFO, &cmd->device->sdev_gendev, logbuf); | |
255 | scsi_log_release_buffer(logbuf); | |
256 | for (k = 0; k < cmd->cmd_len; k += 16) { | |
257 | size_t linelen = min(cmd->cmd_len - k, 16); | |
258 | ||
259 | logbuf = scsi_log_reserve_buffer(&logbuf_len); | |
260 | if (!logbuf) | |
261 | break; | |
21045519 HR |
262 | off = sdev_format_header(logbuf, logbuf_len, |
263 | scmd_name(cmd), | |
9e5ed2a5 HR |
264 | cmd->request->tag); |
265 | if (!WARN_ON(off > logbuf_len - 58)) { | |
266 | off += scnprintf(logbuf + off, logbuf_len - off, | |
267 | "CDB[%02x]: ", k); | |
268 | hex_dump_to_buffer(&cmd->cmnd[k], linelen, | |
269 | 16, 1, logbuf + off, | |
270 | logbuf_len - off, false); | |
271 | } | |
272 | dev_printk(KERN_INFO, &cmd->device->sdev_gendev, | |
273 | logbuf); | |
274 | scsi_log_release_buffer(logbuf); | |
275 | } | |
276 | return; | |
277 | } | |
278 | if (!WARN_ON(off > logbuf_len - 49)) { | |
279 | off += scnprintf(logbuf + off, logbuf_len - off, " "); | |
280 | hex_dump_to_buffer(cmd->cmnd, cmd->cmd_len, 16, 1, | |
281 | logbuf + off, logbuf_len - off, | |
282 | false); | |
283 | } | |
284 | out_printk: | |
285 | dev_printk(KERN_INFO, &cmd->device->sdev_gendev, logbuf); | |
286 | scsi_log_release_buffer(logbuf); | |
287 | } | |
288 | EXPORT_SYMBOL(scsi_print_command); | |
21045519 HR |
289 | |
290 | static size_t | |
291 | scsi_format_extd_sense(char *buffer, size_t buf_len, | |
292 | unsigned char asc, unsigned char ascq) | |
293 | { | |
294 | size_t off = 0; | |
295 | const char *extd_sense_fmt = NULL; | |
296 | const char *extd_sense_str = scsi_extd_sense_format(asc, ascq, | |
297 | &extd_sense_fmt); | |
298 | ||
299 | if (extd_sense_str) { | |
300 | off = scnprintf(buffer, buf_len, "Add. Sense: %s", | |
301 | extd_sense_str); | |
302 | if (extd_sense_fmt) | |
303 | off += scnprintf(buffer + off, buf_len - off, | |
304 | "(%s%x)", extd_sense_fmt, ascq); | |
305 | } else { | |
306 | if (asc >= 0x80) | |
307 | off = scnprintf(buffer, buf_len, "<<vendor>>"); | |
308 | off += scnprintf(buffer + off, buf_len - off, | |
309 | "ASC=0x%x ", asc); | |
310 | if (ascq >= 0x80) | |
311 | off += scnprintf(buffer + off, buf_len - off, | |
312 | "<<vendor>>"); | |
313 | off += scnprintf(buffer + off, buf_len - off, | |
314 | "ASCQ=0x%x ", ascq); | |
315 | } | |
316 | return off; | |
317 | } | |
318 | ||
319 | static size_t | |
320 | scsi_format_sense_hdr(char *buffer, size_t buf_len, | |
321 | const struct scsi_sense_hdr *sshdr) | |
322 | { | |
323 | const char *sense_txt; | |
324 | size_t off; | |
325 | ||
326 | off = scnprintf(buffer, buf_len, "Sense Key : "); | |
327 | sense_txt = scsi_sense_key_string(sshdr->sense_key); | |
328 | if (sense_txt) | |
329 | off += scnprintf(buffer + off, buf_len - off, | |
330 | "%s ", sense_txt); | |
331 | else | |
332 | off += scnprintf(buffer + off, buf_len - off, | |
333 | "0x%x ", sshdr->sense_key); | |
334 | off += scnprintf(buffer + off, buf_len - off, | |
335 | scsi_sense_is_deferred(sshdr) ? "[deferred] " : "[current] "); | |
336 | ||
337 | if (sshdr->response_code >= 0x72) | |
338 | off += scnprintf(buffer + off, buf_len - off, "[descriptor] "); | |
339 | return off; | |
340 | } | |
341 | ||
342 | static void | |
343 | scsi_log_dump_sense(const struct scsi_device *sdev, const char *name, int tag, | |
344 | const unsigned char *sense_buffer, int sense_len) | |
345 | { | |
346 | char *logbuf; | |
347 | size_t logbuf_len; | |
348 | int i; | |
349 | ||
350 | logbuf = scsi_log_reserve_buffer(&logbuf_len); | |
351 | if (!logbuf) | |
352 | return; | |
353 | ||
354 | for (i = 0; i < sense_len; i += 16) { | |
355 | int len = min(sense_len - i, 16); | |
356 | size_t off; | |
357 | ||
358 | off = sdev_format_header(logbuf, logbuf_len, | |
359 | name, tag); | |
360 | hex_dump_to_buffer(&sense_buffer[i], len, 16, 1, | |
361 | logbuf + off, logbuf_len - off, | |
362 | false); | |
363 | dev_printk(KERN_INFO, &sdev->sdev_gendev, logbuf); | |
364 | } | |
365 | scsi_log_release_buffer(logbuf); | |
366 | } | |
367 | ||
368 | static void | |
369 | scsi_log_print_sense_hdr(const struct scsi_device *sdev, const char *name, | |
370 | int tag, const struct scsi_sense_hdr *sshdr) | |
371 | { | |
372 | char *logbuf; | |
373 | size_t off, logbuf_len; | |
374 | ||
375 | logbuf = scsi_log_reserve_buffer(&logbuf_len); | |
376 | if (!logbuf) | |
377 | return; | |
378 | off = sdev_format_header(logbuf, logbuf_len, name, tag); | |
379 | off += scsi_format_sense_hdr(logbuf + off, logbuf_len - off, sshdr); | |
380 | dev_printk(KERN_INFO, &sdev->sdev_gendev, logbuf); | |
381 | scsi_log_release_buffer(logbuf); | |
382 | ||
383 | logbuf = scsi_log_reserve_buffer(&logbuf_len); | |
384 | if (!logbuf) | |
385 | return; | |
386 | off = sdev_format_header(logbuf, logbuf_len, name, tag); | |
387 | off += scsi_format_extd_sense(logbuf + off, logbuf_len - off, | |
388 | sshdr->asc, sshdr->ascq); | |
389 | dev_printk(KERN_INFO, &sdev->sdev_gendev, logbuf); | |
390 | scsi_log_release_buffer(logbuf); | |
391 | } | |
392 | ||
393 | static void | |
394 | scsi_log_print_sense(const struct scsi_device *sdev, const char *name, int tag, | |
395 | const unsigned char *sense_buffer, int sense_len) | |
396 | { | |
397 | struct scsi_sense_hdr sshdr; | |
398 | ||
399 | if (scsi_normalize_sense(sense_buffer, sense_len, &sshdr)) | |
400 | scsi_log_print_sense_hdr(sdev, name, tag, &sshdr); | |
401 | else | |
402 | scsi_log_dump_sense(sdev, name, tag, sense_buffer, sense_len); | |
403 | } | |
404 | ||
405 | /* | |
406 | * Print normalized SCSI sense header with a prefix. | |
407 | */ | |
408 | void | |
409 | scsi_print_sense_hdr(const struct scsi_device *sdev, const char *name, | |
410 | const struct scsi_sense_hdr *sshdr) | |
411 | { | |
412 | scsi_log_print_sense_hdr(sdev, name, -1, sshdr); | |
413 | } | |
414 | EXPORT_SYMBOL(scsi_print_sense_hdr); | |
415 | ||
416 | /* Normalize and print sense buffer with name prefix */ | |
417 | void __scsi_print_sense(const struct scsi_device *sdev, const char *name, | |
418 | const unsigned char *sense_buffer, int sense_len) | |
419 | { | |
420 | scsi_log_print_sense(sdev, name, -1, sense_buffer, sense_len); | |
421 | } | |
422 | EXPORT_SYMBOL(__scsi_print_sense); | |
423 | ||
424 | /* Normalize and print sense buffer in SCSI command */ | |
425 | void scsi_print_sense(const struct scsi_cmnd *cmd) | |
426 | { | |
427 | scsi_log_print_sense(cmd->device, scmd_name(cmd), cmd->request->tag, | |
428 | cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); | |
429 | } | |
430 | EXPORT_SYMBOL(scsi_print_sense); |