LXR linux/drivers/scsi/scsi

   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        trace_seq_putc(p, 0);
  63
  64        return ret;
  65}
  66
  67static const char *
  68scsi_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
  90static const char *
  91scsi_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
 121static const char *
 122scsi_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
 170out:
 171        trace_seq_putc(p, 0);
 172
 173        return ret;
 174}
 175
 176static const char *
 177scsi_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
 188static const char *
 189scsi_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
 223out:
 224        trace_seq_putc(p, 0);
 225
 226        return ret;
 227}
 228
 229static const char *
 230scsi_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
 243static const char *
 244scsi_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
 254const char *
 255scsi_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}
 285