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
  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 }