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scsi_trace.c
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1 /*
2  * Copyright (C) 2010 FUJITSU LIMITED
3  * Copyright (C) 2010 Tomohiro Kusumi <[email protected]>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 #include <linux/kernel.h>
19 #include <linux/trace_seq.h>
20 #include <trace/events/scsi.h>
21 
22 #define SERVICE_ACTION16(cdb) (cdb[1] & 0x1f)
23 #define SERVICE_ACTION32(cdb) ((cdb[8] << 8) | cdb[9])
24 
25 static const char *
26 scsi_trace_misc(struct trace_seq *, unsigned char *, int);
27 
28 static const char *
29 scsi_trace_rw6(struct trace_seq *p, unsigned char *cdb, int len)
30 {
31  const char *ret = p->buffer + p->len;
32  sector_t lba = 0, txlen = 0;
33 
34  lba |= ((cdb[1] & 0x1F) << 16);
35  lba |= (cdb[2] << 8);
36  lba |= cdb[3];
37  txlen = cdb[4];
38 
39  trace_seq_printf(p, "lba=%llu txlen=%llu",
40  (unsigned long long)lba, (unsigned long long)txlen);
41  trace_seq_putc(p, 0);
42 
43  return ret;
44 }
45 
46 static const char *
47 scsi_trace_rw10(struct trace_seq *p, unsigned char *cdb, int len)
48 {
49  const char *ret = p->buffer + p->len;
50  sector_t lba = 0, txlen = 0;
51 
52  lba |= (cdb[2] << 24);
53  lba |= (cdb[3] << 16);
54  lba |= (cdb[4] << 8);
55  lba |= cdb[5];
56  txlen |= (cdb[7] << 8);
57  txlen |= cdb[8];
58 
59  trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
60  (unsigned long long)lba, (unsigned long long)txlen,
61  cdb[1] >> 5);
62 
63  if (cdb[0] == WRITE_SAME)
64  trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
65 
66  trace_seq_putc(p, 0);
67 
68  return ret;
69 }
70 
71 static const char *
72 scsi_trace_rw12(struct trace_seq *p, unsigned char *cdb, int len)
73 {
74  const char *ret = p->buffer + p->len;
75  sector_t lba = 0, txlen = 0;
76 
77  lba |= (cdb[2] << 24);
78  lba |= (cdb[3] << 16);
79  lba |= (cdb[4] << 8);
80  lba |= cdb[5];
81  txlen |= (cdb[6] << 24);
82  txlen |= (cdb[7] << 16);
83  txlen |= (cdb[8] << 8);
84  txlen |= cdb[9];
85 
86  trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
87  (unsigned long long)lba, (unsigned long long)txlen,
88  cdb[1] >> 5);
89  trace_seq_putc(p, 0);
90 
91  return ret;
92 }
93 
94 static const char *
95 scsi_trace_rw16(struct trace_seq *p, unsigned char *cdb, int len)
96 {
97  const char *ret = p->buffer + p->len;
98  sector_t lba = 0, txlen = 0;
99 
100  lba |= ((u64)cdb[2] << 56);
101  lba |= ((u64)cdb[3] << 48);
102  lba |= ((u64)cdb[4] << 40);
103  lba |= ((u64)cdb[5] << 32);
104  lba |= (cdb[6] << 24);
105  lba |= (cdb[7] << 16);
106  lba |= (cdb[8] << 8);
107  lba |= cdb[9];
108  txlen |= (cdb[10] << 24);
109  txlen |= (cdb[11] << 16);
110  txlen |= (cdb[12] << 8);
111  txlen |= cdb[13];
112 
113  trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
114  (unsigned long long)lba, (unsigned long long)txlen,
115  cdb[1] >> 5);
116 
117  if (cdb[0] == WRITE_SAME_16)
118  trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
119 
120  trace_seq_putc(p, 0);
121 
122  return ret;
123 }
124 
125 static const char *
126 scsi_trace_rw32(struct trace_seq *p, unsigned char *cdb, int len)
127 {
128  const char *ret = p->buffer + p->len, *cmd;
129  sector_t lba = 0, txlen = 0;
130  u32 ei_lbrt = 0;
131 
132  switch (SERVICE_ACTION32(cdb)) {
133  case READ_32:
134  cmd = "READ";
135  break;
136  case VERIFY_32:
137  cmd = "VERIFY";
138  break;
139  case WRITE_32:
140  cmd = "WRITE";
141  break;
142  case WRITE_SAME_32:
143  cmd = "WRITE_SAME";
144  break;
145  default:
146  trace_seq_printf(p, "UNKNOWN");
147  goto out;
148  }
149 
150  lba |= ((u64)cdb[12] << 56);
151  lba |= ((u64)cdb[13] << 48);
152  lba |= ((u64)cdb[14] << 40);
153  lba |= ((u64)cdb[15] << 32);
154  lba |= (cdb[16] << 24);
155  lba |= (cdb[17] << 16);
156  lba |= (cdb[18] << 8);
157  lba |= cdb[19];
158  ei_lbrt |= (cdb[20] << 24);
159  ei_lbrt |= (cdb[21] << 16);
160  ei_lbrt |= (cdb[22] << 8);
161  ei_lbrt |= cdb[23];
162  txlen |= (cdb[28] << 24);
163  txlen |= (cdb[29] << 16);
164  txlen |= (cdb[30] << 8);
165  txlen |= cdb[31];
166 
167  trace_seq_printf(p, "%s_32 lba=%llu txlen=%llu protect=%u ei_lbrt=%u",
168  cmd, (unsigned long long)lba,
169  (unsigned long long)txlen, cdb[10] >> 5, ei_lbrt);
170 
171  if (SERVICE_ACTION32(cdb) == WRITE_SAME_32)
172  trace_seq_printf(p, " unmap=%u", cdb[10] >> 3 & 1);
173 
174 out:
175  trace_seq_putc(p, 0);
176 
177  return ret;
178 }
179 
180 static const char *
181 scsi_trace_unmap(struct trace_seq *p, unsigned char *cdb, int len)
182 {
183  const char *ret = p->buffer + p->len;
184  unsigned int regions = cdb[7] << 8 | cdb[8];
185 
186  trace_seq_printf(p, "regions=%u", (regions - 8) / 16);
187  trace_seq_putc(p, 0);
188 
189  return ret;
190 }
191 
192 static const char *
193 scsi_trace_service_action_in(struct trace_seq *p, unsigned char *cdb, int len)
194 {
195  const char *ret = p->buffer + p->len, *cmd;
196  sector_t lba = 0;
197  u32 alloc_len = 0;
198 
199  switch (SERVICE_ACTION16(cdb)) {
200  case SAI_READ_CAPACITY_16:
201  cmd = "READ_CAPACITY_16";
202  break;
203  case SAI_GET_LBA_STATUS:
204  cmd = "GET_LBA_STATUS";
205  break;
206  default:
207  trace_seq_printf(p, "UNKNOWN");
208  goto out;
209  }
210 
211  lba |= ((u64)cdb[2] << 56);
212  lba |= ((u64)cdb[3] << 48);
213  lba |= ((u64)cdb[4] << 40);
214  lba |= ((u64)cdb[5] << 32);
215  lba |= (cdb[6] << 24);
216  lba |= (cdb[7] << 16);
217  lba |= (cdb[8] << 8);
218  lba |= cdb[9];
219  alloc_len |= (cdb[10] << 24);
220  alloc_len |= (cdb[11] << 16);
221  alloc_len |= (cdb[12] << 8);
222  alloc_len |= cdb[13];
223 
224  trace_seq_printf(p, "%s lba=%llu alloc_len=%u", cmd,
225  (unsigned long long)lba, alloc_len);
226 
227 out:
228  trace_seq_putc(p, 0);
229 
230  return ret;
231 }
232 
233 static const char *
234 scsi_trace_varlen(struct trace_seq *p, unsigned char *cdb, int len)
235 {
236  switch (SERVICE_ACTION32(cdb)) {
237  case READ_32:
238  case VERIFY_32:
239  case WRITE_32:
240  case WRITE_SAME_32:
241  return scsi_trace_rw32(p, cdb, len);
242  default:
243  return scsi_trace_misc(p, cdb, len);
244  }
245 }
246 
247 static const char *
248 scsi_trace_misc(struct trace_seq *p, unsigned char *cdb, int len)
249 {
250  const char *ret = p->buffer + p->len;
251 
252  trace_seq_printf(p, "-");
253  trace_seq_putc(p, 0);
254 
255  return ret;
256 }
257 
258 const char *
259 scsi_trace_parse_cdb(struct trace_seq *p, unsigned char *cdb, int len)
260 {
261  switch (cdb[0]) {
262  case READ_6:
263  case WRITE_6:
264  return scsi_trace_rw6(p, cdb, len);
265  case READ_10:
266  case VERIFY:
267  case WRITE_10:
268  case WRITE_SAME:
269  return scsi_trace_rw10(p, cdb, len);
270  case READ_12:
271  case VERIFY_12:
272  case WRITE_12:
273  return scsi_trace_rw12(p, cdb, len);
274  case READ_16:
275  case VERIFY_16:
276  case WRITE_16:
277  case WRITE_SAME_16:
278  return scsi_trace_rw16(p, cdb, len);
279  case UNMAP:
280  return scsi_trace_unmap(p, cdb, len);
281  case SERVICE_ACTION_IN:
282  return scsi_trace_service_action_in(p, cdb, len);
283  case VARIABLE_LENGTH_CMD:
284  return scsi_trace_varlen(p, cdb, len);
285  default:
286  return scsi_trace_misc(p, cdb, len);
287  }
288 }
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