drivers/scsi/scsi_trace.c

   1 /*
   2  * Copyright (C) 2010 FUJITSU LIMITED
   3  * Copyright (C) 2010 Tomohiro Kusumi <kusumi.tomohiro@jp.fujitsu.com>
   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         trace_seq_putc(p, 0);
  63
  64         return ret;
  65 }
  66
  67 static const char *
  68 scsi_trace_rw12(struct trace_seq *p, unsigned char *cdb, int len)
  69 {
  70         const char *ret = p->buffer + p->len;
  71         sector_t lba = 0, txlen = 0;
  72
  73         lba |= (cdb[2] << 24);
  74         lba |= (cdb[3] << 16);
  75         lba |= (cdb[4] << 8);
  76         lba |=  cdb[5];
  77         txlen |= (cdb[6] << 24);
  78         txlen |= (cdb[7] << 16);
  79         txlen |= (cdb[8] << 8);
  80         txlen |=  cdb[9];
  81
  82         trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
  83                          (unsigned long long)lba, (unsigned long long)txlen,
  84                          cdb[1] >> 5);
  85         trace_seq_putc(p, 0);
  86
  87         return ret;
  88 }
  89
  90 static const char *
  91 scsi_trace_rw16(struct trace_seq *p, unsigned char *cdb, int len)
  92 {
  93         const char *ret = p->buffer + p->len;
  94         sector_t lba = 0, txlen = 0;
  95
  96         lba |= ((u64)cdb[2] << 56);
  97         lba |= ((u64)cdb[3] << 48);
  98         lba |= ((u64)cdb[4] << 40);
  99         lba |= ((u64)cdb[5] << 32);
 100         lba |= (cdb[6] << 24);
 101         lba |= (cdb[7] << 16);
 102         lba |= (cdb[8] << 8);
 103         lba |=  cdb[9];
 104         txlen |= (cdb[10] << 24);
 105         txlen |= (cdb[11] << 16);
 106         txlen |= (cdb[12] << 8);
 107         txlen |=  cdb[13];
 108
 109         trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
 110                          (unsigned long long)lba, (unsigned long long)txlen,
 111                          cdb[1] >> 5);
 112
 113         if (cdb[0] == WRITE_SAME_16)
 114                 trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
 115
 116         trace_seq_putc(p, 0);
 117
 118         return ret;
 119 }
 120
 121 static const char *
 122 scsi_trace_rw32(struct trace_seq *p, unsigned char *cdb, int len)
 123 {
 124         const char *ret = p->buffer + p->len, *cmd;
 125         sector_t lba = 0, txlen = 0;
 126         u32 ei_lbrt = 0;
 127
 128         switch (SERVICE_ACTION32(cdb)) {
 129         case READ_32:
 130                 cmd = "READ";
 131                 break;
 132         case VERIFY_32:
 133                 cmd = "VERIFY";
 134                 break;
 135         case WRITE_32:
 136                 cmd = "WRITE";
 137                 break;
 138         case WRITE_SAME_32:
 139                 cmd = "WRITE_SAME";
 140                 break;
 141         default:
 142                 trace_seq_printf(p, "UNKNOWN");
 143                 goto out;
 144         }
 145
 146         lba |= ((u64)cdb[12] << 56);
 147         lba |= ((u64)cdb[13] << 48);
 148         lba |= ((u64)cdb[14] << 40);
 149         lba |= ((u64)cdb[15] << 32);
 150         lba |= (cdb[16] << 24);
 151         lba |= (cdb[17] << 16);
 152         lba |= (cdb[18] << 8);
 153         lba |=  cdb[19];
 154         ei_lbrt |= (cdb[20] << 24);
 155         ei_lbrt |= (cdb[21] << 16);
 156         ei_lbrt |= (cdb[22] << 8);
 157         ei_lbrt |=  cdb[23];
 158         txlen |= (cdb[28] << 24);
 159         txlen |= (cdb[29] << 16);
 160         txlen |= (cdb[30] << 8);
 161         txlen |=  cdb[31];
 162
 163         trace_seq_printf(p, "%s_32 lba=%llu txlen=%llu protect=%u ei_lbrt=%u",
 164                          cmd, (unsigned long long)lba,
 165                          (unsigned long long)txlen, cdb[10] >> 5, ei_lbrt);
 166
 167         if (SERVICE_ACTION32(cdb) == WRITE_SAME_32)
 168                 trace_seq_printf(p, " unmap=%u", cdb[10] >> 3 & 1);
 169
 170 out:
 171         trace_seq_putc(p, 0);
 172
 173         return ret;
 174 }
 175
 176 static const char *
 177 scsi_trace_unmap(struct trace_seq *p, unsigned char *cdb, int len)
 178 {
 179         const char *ret = p->buffer + p->len;
 180         unsigned int regions = cdb[7] << 8 | cdb[8];
 181
 182         trace_seq_printf(p, "regions=%u", (regions - 8) / 16);
 183         trace_seq_putc(p, 0);
 184
 185         return ret;
 186 }
 187
 188 static const char *
 189 scsi_trace_service_action_in(struct trace_seq *p, unsigned char *cdb, int len)
 190 {
 191         const char *ret = p->buffer + p->len, *cmd;
 192         sector_t lba = 0;
 193         u32 alloc_len = 0;
 194
 195         switch (SERVICE_ACTION16(cdb)) {
 196         case SAI_READ_CAPACITY_16:
 197                 cmd = "READ_CAPACITY_16";
 198                 break;
 199         case SAI_GET_LBA_STATUS:
 200                 cmd = "GET_LBA_STATUS";
 201                 break;
 202         default:
 203                 trace_seq_printf(p, "UNKNOWN");
 204                 goto out;
 205         }
 206
 207         lba |= ((u64)cdb[2] << 56);
 208         lba |= ((u64)cdb[3] << 48);
 209         lba |= ((u64)cdb[4] << 40);
 210         lba |= ((u64)cdb[5] << 32);
 211         lba |= (cdb[6] << 24);
 212         lba |= (cdb[7] << 16);
 213         lba |= (cdb[8] << 8);
 214         lba |=  cdb[9];
 215         alloc_len |= (cdb[10] << 24);
 216         alloc_len |= (cdb[11] << 16);
 217         alloc_len |= (cdb[12] << 8);
 218         alloc_len |=  cdb[13];
 219
 220         trace_seq_printf(p, "%s lba=%llu alloc_len=%u", cmd,
 221                          (unsigned long long)lba, alloc_len);
 222
 223 out:
 224         trace_seq_putc(p, 0);
 225
 226         return ret;
 227 }
 228
 229 static const char *
 230 scsi_trace_varlen(struct trace_seq *p, unsigned char *cdb, int len)
 231 {
 232         switch (SERVICE_ACTION32(cdb)) {
 233         case READ_32:
 234         case VERIFY_32:
 235         case WRITE_32:
 236         case WRITE_SAME_32:
 237                 return scsi_trace_rw32(p, cdb, len);
 238         default:
 239                 return scsi_trace_misc(p, cdb, len);
 240         }
 241 }
 242
 243 static const char *
 244 scsi_trace_misc(struct trace_seq *p, unsigned char *cdb, int len)
 245 {
 246         const char *ret = p->buffer + p->len;
 247
 248         trace_seq_printf(p, "-");
 249         trace_seq_putc(p, 0);
 250
 251         return ret;
 252 }
 253
 254 const char *
 255 scsi_trace_parse_cdb(struct trace_seq *p, unsigned char *cdb, int len)
 256 {
 257         switch (cdb[0]) {
 258         case READ_6:
 259         case WRITE_6:
 260                 return scsi_trace_rw6(p, cdb, len);
 261         case READ_10:
 262         case VERIFY:
 263         case WRITE_10:
 264         case WRITE_SAME:
 265                 return scsi_trace_rw10(p, cdb, len);
 266         case READ_12:
 267         case VERIFY_12:
 268         case WRITE_12:
 269                 return scsi_trace_rw12(p, cdb, len);
 270         case READ_16:
 271         case VERIFY_16:
 272         case WRITE_16:
 273         case WRITE_SAME_16:
 274                 return scsi_trace_rw16(p, cdb, len);
 275         case UNMAP:
 276                 return scsi_trace_unmap(p, cdb, len);
 277         case SERVICE_ACTION_IN:
 278                 return scsi_trace_service_action_in(p, cdb, len);
 279         case VARIABLE_LENGTH_CMD:
 280                 return scsi_trace_varlen(p, cdb, len);
 281         default:
 282                 return scsi_trace_misc(p, cdb, len);
 283         }
 284 }