linux/drivers/scsi/scsi_trace.c
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   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
  25static const char *
  26scsi_trace_misc(struct trace_seq *, unsigned char *, int);
  27
  28static const char *
  29scsi_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
  46static const char *
  47scsi_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
  71static const char *
  72scsi_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
  94static const char *
  95scsi_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
 125static const char *
 126scsi_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
 174out:
 175        trace_seq_putc(p, 0);
 176
 177        return ret;
 178}
 179
 180static const char *
 181scsi_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
 192static const char *
 193scsi_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
 227out:
 228        trace_seq_putc(p, 0);
 229
 230        return ret;
 231}
 232
 233static const char *
 234scsi_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
 247static const char *
 248scsi_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
 258const char *
 259scsi_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}
 289
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